fs/ocfs2/xattr.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * xattr.c
   5  *
   6  * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
   7  *
   8  * CREDITS:
   9  * Lots of code in this file is copy from linux/fs/ext3/xattr.c.
  10  * Copyright (C) 2001-2003 Andreas Gruenbacher, <[email protected]>
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public
  14  * License version 2 as published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  */
  21
  22 #include <linux/capability.h>
  23 #include <linux/fs.h>
  24 #include <linux/types.h>
  25 #include <linux/slab.h>
  26 #include <linux/highmem.h>
  27 #include <linux/pagemap.h>
  28 #include <linux/uio.h>
  29 #include <linux/sched.h>
  30 #include <linux/splice.h>
  31 #include <linux/mount.h>
  32 #include <linux/writeback.h>
  33 #include <linux/falloc.h>
  34 #include <linux/sort.h>
  35 #include <linux/init.h>
  36 #include <linux/module.h>
  37 #include <linux/string.h>
  38 #include <linux/security.h>
  39
  40 #include <cluster/masklog.h>
  41
  42 #include "ocfs2.h"
  43 #include "alloc.h"
  44 #include "blockcheck.h"
  45 #include "dlmglue.h"
  46 #include "file.h"
  47 #include "symlink.h"
  48 #include "sysfile.h"
  49 #include "inode.h"
  50 #include "journal.h"
  51 #include "ocfs2_fs.h"
  52 #include "suballoc.h"
  53 #include "uptodate.h"
  54 #include "buffer_head_io.h"
  55 #include "super.h"
  56 #include "xattr.h"
  57 #include "refcounttree.h"
  58 #include "acl.h"
  59 #include "ocfs2_trace.h"
  60
  61 struct ocfs2_xattr_def_value_root {
  62         struct ocfs2_xattr_value_root   xv;
  63         struct ocfs2_extent_rec         er;
  64 };
  65
  66 struct ocfs2_xattr_bucket {
  67         /* The inode these xattrs are associated with */
  68         struct inode *bu_inode;
  69
  70         /* The actual buffers that make up the bucket */
  71         struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
  72
  73         /* How many blocks make up one bucket for this filesystem */
  74         int bu_blocks;
  75 };
  76
  77 struct ocfs2_xattr_set_ctxt {
  78         handle_t *handle;
  79         struct ocfs2_alloc_context *meta_ac;
  80         struct ocfs2_alloc_context *data_ac;
  81         struct ocfs2_cached_dealloc_ctxt dealloc;
  82         int set_abort;
  83 };
  84
  85 #define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
  86 #define OCFS2_XATTR_INLINE_SIZE 80
  87 #define OCFS2_XATTR_HEADER_GAP  4
  88 #define OCFS2_XATTR_FREE_IN_IBODY       (OCFS2_MIN_XATTR_INLINE_SIZE \
  89                                          - sizeof(struct ocfs2_xattr_header) \
  90                                          - OCFS2_XATTR_HEADER_GAP)
  91 #define OCFS2_XATTR_FREE_IN_BLOCK(ptr)  ((ptr)->i_sb->s_blocksize \
  92                                          - sizeof(struct ocfs2_xattr_block) \
  93                                          - sizeof(struct ocfs2_xattr_header) \
  94                                          - OCFS2_XATTR_HEADER_GAP)
  95
  96 static struct ocfs2_xattr_def_value_root def_xv = {
  97         .xv.xr_list.l_count = cpu_to_le16(1),
  98 };
  99
 100 const struct xattr_handler *ocfs2_xattr_handlers[] = {
 101         &ocfs2_xattr_user_handler,
 102         &posix_acl_access_xattr_handler,
 103         &posix_acl_default_xattr_handler,
 104         &ocfs2_xattr_trusted_handler,
 105         &ocfs2_xattr_security_handler,
 106         NULL
 107 };
 108
 109 static const struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
 110         [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
 111         [OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
 112                                         = &posix_acl_access_xattr_handler,
 113         [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
 114                                         = &posix_acl_default_xattr_handler,
 115         [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
 116         [OCFS2_XATTR_INDEX_SECURITY]    = &ocfs2_xattr_security_handler,
 117 };
 118
 119 struct ocfs2_xattr_info {
 120         int             xi_name_index;
 121         const char      *xi_name;
 122         int             xi_name_len;
 123         const void      *xi_value;
 124         size_t          xi_value_len;
 125 };
 126
 127 struct ocfs2_xattr_search {
 128         struct buffer_head *inode_bh;
 129         /*
 130          * xattr_bh point to the block buffer head which has extended attribute
 131          * when extended attribute in inode, xattr_bh is equal to inode_bh.
 132          */
 133         struct buffer_head *xattr_bh;
 134         struct ocfs2_xattr_header *header;
 135         struct ocfs2_xattr_bucket *bucket;
 136         void *base;
 137         void *end;
 138         struct ocfs2_xattr_entry *here;
 139         int not_found;
 140 };
 141
 142 /* Operations on struct ocfs2_xa_entry */
 143 struct ocfs2_xa_loc;
 144 struct ocfs2_xa_loc_operations {
 145         /*
 146          * Journal functions
 147          */
 148         int (*xlo_journal_access)(handle_t *handle, struct ocfs2_xa_loc *loc,
 149                                   int type);
 150         void (*xlo_journal_dirty)(handle_t *handle, struct ocfs2_xa_loc *loc);
 151
 152         /*
 153          * Return a pointer to the appropriate buffer in loc->xl_storage
 154          * at the given offset from loc->xl_header.
 155          */
 156         void *(*xlo_offset_pointer)(struct ocfs2_xa_loc *loc, int offset);
 157
 158         /* Can we reuse the existing entry for the new value? */
 159         int (*xlo_can_reuse)(struct ocfs2_xa_loc *loc,
 160                              struct ocfs2_xattr_info *xi);
 161
 162         /* How much space is needed for the new value? */
 163         int (*xlo_check_space)(struct ocfs2_xa_loc *loc,
 164                                struct ocfs2_xattr_info *xi);
 165
 166         /*
 167          * Return the offset of the first name+value pair.  This is
 168          * the start of our downward-filling free space.
 169          */
 170         int (*xlo_get_free_start)(struct ocfs2_xa_loc *loc);
 171
 172         /*
 173          * Remove the name+value at this location.  Do whatever is
 174          * appropriate with the remaining name+value pairs.
 175          */
 176         void (*xlo_wipe_namevalue)(struct ocfs2_xa_loc *loc);
 177
 178         /* Fill xl_entry with a new entry */
 179         void (*xlo_add_entry)(struct ocfs2_xa_loc *loc, u32 name_hash);
 180
 181         /* Add name+value storage to an entry */
 182         void (*xlo_add_namevalue)(struct ocfs2_xa_loc *loc, int size);
 183
 184         /*
 185          * Initialize the value buf's access and bh fields for this entry.
 186          * ocfs2_xa_fill_value_buf() will handle the xv pointer.
 187          */
 188         void (*xlo_fill_value_buf)(struct ocfs2_xa_loc *loc,
 189                                    struct ocfs2_xattr_value_buf *vb);
 190 };
 191
 192 /*
 193  * Describes an xattr entry location.  This is a memory structure
 194  * tracking the on-disk structure.
 195  */
 196 struct ocfs2_xa_loc {
 197         /* This xattr belongs to this inode */
 198         struct inode *xl_inode;
 199
 200         /* The ocfs2_xattr_header inside the on-disk storage. Not NULL. */
 201         struct ocfs2_xattr_header *xl_header;
 202
 203         /* Bytes from xl_header to the end of the storage */
 204         int xl_size;
 205
 206         /*
 207          * The ocfs2_xattr_entry this location describes.  If this is
 208          * NULL, this location describes the on-disk structure where it
 209          * would have been.
 210          */
 211         struct ocfs2_xattr_entry *xl_entry;
 212
 213         /*
 214          * Internal housekeeping
 215          */
 216
 217         /* Buffer(s) containing this entry */
 218         void *xl_storage;
 219
 220         /* Operations on the storage backing this location */
 221         const struct ocfs2_xa_loc_operations *xl_ops;
 222 };
 223
 224 /*
 225  * Convenience functions to calculate how much space is needed for a
 226  * given name+value pair
 227  */
 228 static int namevalue_size(int name_len, uint64_t value_len)
 229 {
 230         if (value_len > OCFS2_XATTR_INLINE_SIZE)
 231                 return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
 232         else
 233                 return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
 234 }
 235
 236 static int namevalue_size_xi(struct ocfs2_xattr_info *xi)
 237 {
 238         return namevalue_size(xi->xi_name_len, xi->xi_value_len);
 239 }
 240
 241 static int namevalue_size_xe(struct ocfs2_xattr_entry *xe)
 242 {
 243         u64 value_len = le64_to_cpu(xe->xe_value_size);
 244
 245         BUG_ON((value_len > OCFS2_XATTR_INLINE_SIZE) &&
 246                ocfs2_xattr_is_local(xe));
 247         return namevalue_size(xe->xe_name_len, value_len);
 248 }
 249
 250
 251 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
 252                                              struct ocfs2_xattr_header *xh,
 253                                              int index,
 254                                              int *block_off,
 255                                              int *new_offset);
 256
 257 static int ocfs2_xattr_block_find(struct inode *inode,
 258                                   int name_index,
 259                                   const char *name,
 260                                   struct ocfs2_xattr_search *xs);
 261 static int ocfs2_xattr_index_block_find(struct inode *inode,
 262                                         struct buffer_head *root_bh,
 263                                         int name_index,
 264                                         const char *name,
 265                                         struct ocfs2_xattr_search *xs);
 266
 267 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
 268                                         struct buffer_head *blk_bh,
 269                                         char *buffer,
 270                                         size_t buffer_size);
 271
 272 static int ocfs2_xattr_create_index_block(struct inode *inode,
 273                                           struct ocfs2_xattr_search *xs,
 274                                           struct ocfs2_xattr_set_ctxt *ctxt);
 275
 276 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
 277                                              struct ocfs2_xattr_info *xi,
 278                                              struct ocfs2_xattr_search *xs,
 279                                              struct ocfs2_xattr_set_ctxt *ctxt);
 280
 281 typedef int (xattr_tree_rec_func)(struct inode *inode,
 282                                   struct buffer_head *root_bh,
 283                                   u64 blkno, u32 cpos, u32 len, void *para);
 284 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
 285                                            struct buffer_head *root_bh,
 286                                            xattr_tree_rec_func *rec_func,
 287                                            void *para);
 288 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
 289                                         struct ocfs2_xattr_bucket *bucket,
 290                                         void *para);
 291 static int ocfs2_rm_xattr_cluster(struct inode *inode,
 292                                   struct buffer_head *root_bh,
 293                                   u64 blkno,
 294                                   u32 cpos,
 295                                   u32 len,
 296                                   void *para);
 297
 298 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
 299                                   u64 src_blk, u64 last_blk, u64 to_blk,
 300                                   unsigned int start_bucket,
 301                                   u32 *first_hash);
 302 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
 303                                         struct ocfs2_dinode *di,
 304                                         struct ocfs2_xattr_info *xi,
 305                                         struct ocfs2_xattr_search *xis,
 306                                         struct ocfs2_xattr_search *xbs,
 307                                         struct ocfs2_refcount_tree **ref_tree,
 308                                         int *meta_need,
 309                                         int *credits);
 310 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
 311                                            struct ocfs2_xattr_bucket *bucket,
 312                                            int offset,
 313                                            struct ocfs2_xattr_value_root **xv,
 314                                            struct buffer_head **bh);
 315
 316 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
 317 {
 318         return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
 319 }
 320
 321 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
 322 {
 323         return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
 324 }
 325
 326 #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
 327 #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
 328 #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
 329
 330 static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
 331 {
 332         struct ocfs2_xattr_bucket *bucket;
 333         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
 334
 335         BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
 336
 337         bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
 338         if (bucket) {
 339                 bucket->bu_inode = inode;
 340                 bucket->bu_blocks = blks;
 341         }
 342
 343         return bucket;
 344 }
 345
 346 static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
 347 {
 348         int i;
 349
 350         for (i = 0; i < bucket->bu_blocks; i++) {
 351                 brelse(bucket->bu_bhs[i]);
 352                 bucket->bu_bhs[i] = NULL;
 353         }
 354 }
 355
 356 static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
 357 {
 358         if (bucket) {
 359                 ocfs2_xattr_bucket_relse(bucket);
 360                 bucket->bu_inode = NULL;
 361                 kfree(bucket);
 362         }
 363 }
 364
 365 /*
 366  * A bucket that has never been written to disk doesn't need to be
 367  * read.  We just need the buffer_heads.  Don't call this for
 368  * buckets that are already on disk.  ocfs2_read_xattr_bucket() initializes
 369  * them fully.
 370  */
 371 static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
 372                                    u64 xb_blkno, int new)
 373 {
 374         int i, rc = 0;
 375
 376         for (i = 0; i < bucket->bu_blocks; i++) {
 377                 bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
 378                                               xb_blkno + i);
 379                 if (!bucket->bu_bhs[i]) {
 380                         rc = -ENOMEM;
 381                         mlog_errno(rc);
 382                         break;
 383                 }
 384
 385                 if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
 386                                            bucket->bu_bhs[i])) {
 387                         if (new)
 388                                 ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
 389                                                               bucket->bu_bhs[i]);
 390                         else {
 391                                 set_buffer_uptodate(bucket->bu_bhs[i]);
 392                                 ocfs2_set_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
 393                                                           bucket->bu_bhs[i]);
 394                         }
 395                 }
 396         }
 397
 398         if (rc)
 399                 ocfs2_xattr_bucket_relse(bucket);
 400         return rc;
 401 }
 402
 403 /* Read the xattr bucket at xb_blkno */
 404 static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
 405                                    u64 xb_blkno)
 406 {
 407         int rc;
 408
 409         rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
 410                                bucket->bu_blocks, bucket->bu_bhs, 0,
 411                                NULL);
 412         if (!rc) {
 413                 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 414                 rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
 415                                                  bucket->bu_bhs,
 416                                                  bucket->bu_blocks,
 417                                                  &bucket_xh(bucket)->xh_check);
 418                 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 419                 if (rc)
 420                         mlog_errno(rc);
 421         }
 422
 423         if (rc)
 424                 ocfs2_xattr_bucket_relse(bucket);
 425         return rc;
 426 }
 427
 428 static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
 429                                              struct ocfs2_xattr_bucket *bucket,
 430                                              int type)
 431 {
 432         int i, rc = 0;
 433
 434         for (i = 0; i < bucket->bu_blocks; i++) {
 435                 rc = ocfs2_journal_access(handle,
 436                                           INODE_CACHE(bucket->bu_inode),
 437                                           bucket->bu_bhs[i], type);
 438                 if (rc) {
 439                         mlog_errno(rc);
 440                         break;
 441                 }
 442         }
 443
 444         return rc;
 445 }
 446
 447 static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
 448                                              struct ocfs2_xattr_bucket *bucket)
 449 {
 450         int i;
 451
 452         spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 453         ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
 454                                    bucket->bu_bhs, bucket->bu_blocks,
 455                                    &bucket_xh(bucket)->xh_check);
 456         spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 457
 458         for (i = 0; i < bucket->bu_blocks; i++)
 459                 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
 460 }
 461
 462 static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
 463                                          struct ocfs2_xattr_bucket *src)
 464 {
 465         int i;
 466         int blocksize = src->bu_inode->i_sb->s_blocksize;
 467
 468         BUG_ON(dest->bu_blocks != src->bu_blocks);
 469         BUG_ON(dest->bu_inode != src->bu_inode);
 470
 471         for (i = 0; i < src->bu_blocks; i++) {
 472                 memcpy(bucket_block(dest, i), bucket_block(src, i),
 473                        blocksize);
 474         }
 475 }
 476
 477 static int ocfs2_validate_xattr_block(struct super_block *sb,
 478                                       struct buffer_head *bh)
 479 {
 480         int rc;
 481         struct ocfs2_xattr_block *xb =
 482                 (struct ocfs2_xattr_block *)bh->b_data;
 483
 484         trace_ocfs2_validate_xattr_block((unsigned long long)bh->b_blocknr);
 485
 486         BUG_ON(!buffer_uptodate(bh));
 487
 488         /*
 489          * If the ecc fails, we return the error but otherwise
 490          * leave the filesystem running.  We know any error is
 491          * local to this block.
 492          */
 493         rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
 494         if (rc)
 495                 return rc;
 496
 497         /*
 498          * Errors after here are fatal
 499          */
 500
 501         if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
 502                 return ocfs2_error(sb,
 503                                    "Extended attribute block #%llu has bad signature %.*s\n",
 504                                    (unsigned long long)bh->b_blocknr, 7,
 505                                    xb->xb_signature);
 506         }
 507
 508         if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
 509                 return ocfs2_error(sb,
 510                                    "Extended attribute block #%llu has an invalid xb_blkno of %llu\n",
 511                                    (unsigned long long)bh->b_blocknr,
 512                                    (unsigned long long)le64_to_cpu(xb->xb_blkno));
 513         }
 514
 515         if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
 516                 return ocfs2_error(sb,
 517                                    "Extended attribute block #%llu has an invalid xb_fs_generation of #%u\n",
 518                                    (unsigned long long)bh->b_blocknr,
 519                                    le32_to_cpu(xb->xb_fs_generation));
 520         }
 521
 522         return 0;
 523 }
 524
 525 static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
 526                                   struct buffer_head **bh)
 527 {
 528         int rc;
 529         struct buffer_head *tmp = *bh;
 530
 531         rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
 532                               ocfs2_validate_xattr_block);
 533
 534         /* If ocfs2_read_block() got us a new bh, pass it up. */
 535         if (!rc && !*bh)
 536                 *bh = tmp;
 537
 538         return rc;
 539 }
 540
 541 static inline const char *ocfs2_xattr_prefix(int name_index)
 542 {
 543         const struct xattr_handler *handler = NULL;
 544
 545         if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
 546                 handler = ocfs2_xattr_handler_map[name_index];
 547
 548         return handler ? handler->prefix : NULL;
 549 }
 550
 551 static u32 ocfs2_xattr_name_hash(struct inode *inode,
 552                                  const char *name,
 553                                  int name_len)
 554 {
 555         /* Get hash value of uuid from super block */
 556         u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
 557         int i;
 558
 559         /* hash extended attribute name */
 560         for (i = 0; i < name_len; i++) {
 561                 hash = (hash << OCFS2_HASH_SHIFT) ^
 562                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
 563                        *name++;
 564         }
 565
 566         return hash;
 567 }
 568
 569 static int ocfs2_xattr_entry_real_size(int name_len, size_t value_len)
 570 {
 571         return namevalue_size(name_len, value_len) +
 572                 sizeof(struct ocfs2_xattr_entry);
 573 }
 574
 575 static int ocfs2_xi_entry_usage(struct ocfs2_xattr_info *xi)
 576 {
 577         return namevalue_size_xi(xi) +
 578                 sizeof(struct ocfs2_xattr_entry);
 579 }
 580
 581 static int ocfs2_xe_entry_usage(struct ocfs2_xattr_entry *xe)
 582 {
 583         return namevalue_size_xe(xe) +
 584                 sizeof(struct ocfs2_xattr_entry);
 585 }
 586
 587 int ocfs2_calc_security_init(struct inode *dir,
 588                              struct ocfs2_security_xattr_info *si,
 589                              int *want_clusters,
 590                              int *xattr_credits,
 591                              struct ocfs2_alloc_context **xattr_ac)
 592 {
 593         int ret = 0;
 594         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 595         int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
 596                                                  si->value_len);
 597
 598         /*
 599          * The max space of security xattr taken inline is
 600          * 256(name) + 80(value) + 16(entry) = 352 bytes,
 601          * So reserve one metadata block for it is ok.
 602          */
 603         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
 604             s_size > OCFS2_XATTR_FREE_IN_IBODY) {
 605                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
 606                 if (ret) {
 607                         mlog_errno(ret);
 608                         return ret;
 609                 }
 610                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 611         }
 612
 613         /* reserve clusters for xattr value which will be set in B tree*/
 614         if (si->value_len > OCFS2_XATTR_INLINE_SIZE) {
 615                 int new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
 616                                                             si->value_len);
 617
 618                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 619                                                            new_clusters);
 620                 *want_clusters += new_clusters;
 621         }
 622         return ret;
 623 }
 624
 625 int ocfs2_calc_xattr_init(struct inode *dir,
 626                           struct buffer_head *dir_bh,
 627                           umode_t mode,
 628                           struct ocfs2_security_xattr_info *si,
 629                           int *want_clusters,
 630                           int *xattr_credits,
 631                           int *want_meta)
 632 {
 633         int ret = 0;
 634         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 635         int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
 636
 637         if (si->enable)
 638                 s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
 639                                                      si->value_len);
 640
 641         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
 642                 acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
 643                                         OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
 644                                         "", NULL, 0);
 645                 if (acl_len > 0) {
 646                         a_size = ocfs2_xattr_entry_real_size(0, acl_len);
 647                         if (S_ISDIR(mode))
 648                                 a_size <<= 1;
 649                 } else if (acl_len != 0 && acl_len != -ENODATA) {
 650                         mlog_errno(ret);
 651                         return ret;
 652                 }
 653         }
 654
 655         if (!(s_size + a_size))
 656                 return ret;
 657
 658         /*
 659          * The max space of security xattr taken inline is
 660          * 256(name) + 80(value) + 16(entry) = 352 bytes,
 661          * The max space of acl xattr taken inline is
 662          * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
 663          * when blocksize = 512, may reserve one more cluser for
 664          * xattr bucket, otherwise reserve one metadata block
 665          * for them is ok.
 666          * If this is a new directory with inline data,
 667          * we choose to reserve the entire inline area for
 668          * directory contents and force an external xattr block.
 669          */
 670         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
 671             (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
 672             (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
 673                 *want_meta = *want_meta + 1;
 674                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 675         }
 676
 677         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
 678             (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
 679                 *want_clusters += 1;
 680                 *xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
 681         }
 682
 683         /*
 684          * reserve credits and clusters for xattrs which has large value
 685          * and have to be set outside
 686          */
 687         if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
 688                 new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
 689                                                         si->value_len);
 690                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 691                                                            new_clusters);
 692                 *want_clusters += new_clusters;
 693         }
 694         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
 695             acl_len > OCFS2_XATTR_INLINE_SIZE) {
 696                 /* for directory, it has DEFAULT and ACCESS two types of acls */
 697                 new_clusters = (S_ISDIR(mode) ? 2 : 1) *
 698                                 ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
 699                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 700                                                            new_clusters);
 701                 *want_clusters += new_clusters;
 702         }
 703
 704         return ret;
 705 }
 706
 707 static int ocfs2_xattr_extend_allocation(struct inode *inode,
 708                                          u32 clusters_to_add,
 709                                          struct ocfs2_xattr_value_buf *vb,
 710                                          struct ocfs2_xattr_set_ctxt *ctxt)
 711 {
 712         int status = 0, credits;
 713         handle_t *handle = ctxt->handle;
 714         enum ocfs2_alloc_restarted why;
 715         u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_xv->xr_clusters);
 716         struct ocfs2_extent_tree et;
 717
 718         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
 719
 720         while (clusters_to_add) {
 721                 trace_ocfs2_xattr_extend_allocation(clusters_to_add);
 722
 723                 status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
 724                                        OCFS2_JOURNAL_ACCESS_WRITE);
 725                 if (status < 0) {
 726                         mlog_errno(status);
 727                         break;
 728                 }
 729
 730                 prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
 731                 status = ocfs2_add_clusters_in_btree(handle,
 732                                                      &et,
 733                                                      &logical_start,
 734                                                      clusters_to_add,
 735                                                      0,
 736                                                      ctxt->data_ac,
 737                                                      ctxt->meta_ac,
 738                                                      &why);
 739                 if ((status < 0) && (status != -EAGAIN)) {
 740                         if (status != -ENOSPC)
 741                                 mlog_errno(status);
 742                         break;
 743                 }
 744
 745                 ocfs2_journal_dirty(handle, vb->vb_bh);
 746
 747                 clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) -
 748                                          prev_clusters;
 749
 750                 if (why != RESTART_NONE && clusters_to_add) {
 751                         /*
 752                          * We can only fail in case the alloc file doesn't give
 753                          * up enough clusters.
 754                          */
 755                         BUG_ON(why == RESTART_META);
 756
 757                         credits = ocfs2_calc_extend_credits(inode->i_sb,
 758                                                             &vb->vb_xv->xr_list);
 759                         status = ocfs2_extend_trans(handle, credits);
 760                         if (status < 0) {
 761                                 status = -ENOMEM;
 762                                 mlog_errno(status);
 763                                 break;
 764                         }
 765                 }
 766         }
 767
 768         return status;
 769 }
 770
 771 static int __ocfs2_remove_xattr_range(struct inode *inode,
 772                                       struct ocfs2_xattr_value_buf *vb,
 773                                       u32 cpos, u32 phys_cpos, u32 len,
 774                                       unsigned int ext_flags,
 775                                       struct ocfs2_xattr_set_ctxt *ctxt)
 776 {
 777         int ret;
 778         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 779         handle_t *handle = ctxt->handle;
 780         struct ocfs2_extent_tree et;
 781
 782         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
 783
 784         ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
 785                             OCFS2_JOURNAL_ACCESS_WRITE);
 786         if (ret) {
 787                 mlog_errno(ret);
 788                 goto out;
 789         }
 790
 791         ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
 792                                   &ctxt->dealloc);
 793         if (ret) {
 794                 mlog_errno(ret);
 795                 goto out;
 796         }
 797
 798         le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
 799         ocfs2_journal_dirty(handle, vb->vb_bh);
 800
 801         if (ext_flags & OCFS2_EXT_REFCOUNTED)
 802                 ret = ocfs2_decrease_refcount(inode, handle,
 803                                         ocfs2_blocks_to_clusters(inode->i_sb,
 804                                                                  phys_blkno),
 805                                         len, ctxt->meta_ac, &ctxt->dealloc, 1);
 806         else
 807                 ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
 808                                                   phys_blkno, len);
 809         if (ret)
 810                 mlog_errno(ret);
 811
 812 out:
 813         return ret;
 814 }
 815
 816 static int ocfs2_xattr_shrink_size(struct inode *inode,
 817                                    u32 old_clusters,
 818                                    u32 new_clusters,
 819                                    struct ocfs2_xattr_value_buf *vb,
 820                                    struct ocfs2_xattr_set_ctxt *ctxt)
 821 {
 822         int ret = 0;
 823         unsigned int ext_flags;
 824         u32 trunc_len, cpos, phys_cpos, alloc_size;
 825         u64 block;
 826
 827         if (old_clusters <= new_clusters)
 828                 return 0;
 829
 830         cpos = new_clusters;
 831         trunc_len = old_clusters - new_clusters;
 832         while (trunc_len) {
 833                 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
 834                                                &alloc_size,
 835                                                &vb->vb_xv->xr_list, &ext_flags);
 836                 if (ret) {
 837                         mlog_errno(ret);
 838                         goto out;
 839                 }
 840
 841                 if (alloc_size > trunc_len)
 842                         alloc_size = trunc_len;
 843
 844                 ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
 845                                                  phys_cpos, alloc_size,
 846                                                  ext_flags, ctxt);
 847                 if (ret) {
 848                         mlog_errno(ret);
 849                         goto out;
 850                 }
 851
 852                 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 853                 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
 854                                                        block, alloc_size);
 855                 cpos += alloc_size;
 856                 trunc_len -= alloc_size;
 857         }
 858
 859 out:
 860         return ret;
 861 }
 862
 863 static int ocfs2_xattr_value_truncate(struct inode *inode,
 864                                       struct ocfs2_xattr_value_buf *vb,
 865                                       int len,
 866                                       struct ocfs2_xattr_set_ctxt *ctxt)
 867 {
 868         int ret;
 869         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
 870         u32 old_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
 871
 872         if (new_clusters == old_clusters)
 873                 return 0;
 874
 875         if (new_clusters > old_clusters)
 876                 ret = ocfs2_xattr_extend_allocation(inode,
 877                                                     new_clusters - old_clusters,
 878                                                     vb, ctxt);
 879         else
 880                 ret = ocfs2_xattr_shrink_size(inode,
 881                                               old_clusters, new_clusters,
 882                                               vb, ctxt);
 883
 884         return ret;
 885 }
 886
 887 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
 888                                   size_t *result, const char *prefix,
 889                                   const char *name, int name_len)
 890 {
 891         char *p = buffer + *result;
 892         int prefix_len = strlen(prefix);
 893         int total_len = prefix_len + name_len + 1;
 894
 895         *result += total_len;
 896
 897         /* we are just looking for how big our buffer needs to be */
 898         if (!size)
 899                 return 0;
 900
 901         if (*result > size)
 902                 return -ERANGE;
 903
 904         memcpy(p, prefix, prefix_len);
 905         memcpy(p + prefix_len, name, name_len);
 906         p[prefix_len + name_len] = '\0';
 907
 908         return 0;
 909 }
 910
 911 static int ocfs2_xattr_list_entries(struct inode *inode,
 912                                     struct ocfs2_xattr_header *header,
 913                                     char *buffer, size_t buffer_size)
 914 {
 915         size_t result = 0;
 916         int i, type, ret;
 917         const char *prefix, *name;
 918
 919         for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
 920                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
 921                 type = ocfs2_xattr_get_type(entry);
 922                 prefix = ocfs2_xattr_prefix(type);
 923
 924                 if (prefix) {
 925                         name = (const char *)header +
 926                                 le16_to_cpu(entry->xe_name_offset);
 927
 928                         ret = ocfs2_xattr_list_entry(buffer, buffer_size,
 929                                                      &result, prefix, name,
 930                                                      entry->xe_name_len);
 931                         if (ret)
 932                                 return ret;
 933                 }
 934         }
 935
 936         return result;
 937 }
 938
 939 int ocfs2_has_inline_xattr_value_outside(struct inode *inode,
 940                                          struct ocfs2_dinode *di)
 941 {
 942         struct ocfs2_xattr_header *xh;
 943         int i;
 944
 945         xh = (struct ocfs2_xattr_header *)
 946                  ((void *)di + inode->i_sb->s_blocksize -
 947                  le16_to_cpu(di->i_xattr_inline_size));
 948
 949         for (i = 0; i < le16_to_cpu(xh->xh_count); i++)
 950                 if (!ocfs2_xattr_is_local(&xh->xh_entries[i]))
 951                         return 1;
 952
 953         return 0;
 954 }
 955
 956 static int ocfs2_xattr_ibody_list(struct inode *inode,
 957                                   struct ocfs2_dinode *di,
 958                                   char *buffer,
 959                                   size_t buffer_size)
 960 {
 961         struct ocfs2_xattr_header *header = NULL;
 962         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 963         int ret = 0;
 964
 965         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 966                 return ret;
 967
 968         header = (struct ocfs2_xattr_header *)
 969                  ((void *)di + inode->i_sb->s_blocksize -
 970                  le16_to_cpu(di->i_xattr_inline_size));
 971
 972         ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
 973
 974         return ret;
 975 }
 976
 977 static int ocfs2_xattr_block_list(struct inode *inode,
 978                                   struct ocfs2_dinode *di,
 979                                   char *buffer,
 980                                   size_t buffer_size)
 981 {
 982         struct buffer_head *blk_bh = NULL;
 983         struct ocfs2_xattr_block *xb;
 984         int ret = 0;
 985
 986         if (!di->i_xattr_loc)
 987                 return ret;
 988
 989         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
 990                                      &blk_bh);
 991         if (ret < 0) {
 992                 mlog_errno(ret);
 993                 return ret;
 994         }
 995
 996         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
 997         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
 998                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
 999                 ret = ocfs2_xattr_list_entries(inode, header,
1000                                                buffer, buffer_size);
1001         } else
1002                 ret = ocfs2_xattr_tree_list_index_block(inode, blk_bh,
1003                                                    buffer, buffer_size);
1004
1005         brelse(blk_bh);
1006
1007         return ret;
1008 }
1009
1010 ssize_t ocfs2_listxattr(struct dentry *dentry,
1011                         char *buffer,
1012                         size_t size)
1013 {
1014         int ret = 0, i_ret = 0, b_ret = 0;
1015         struct buffer_head *di_bh = NULL;
1016         struct ocfs2_dinode *di = NULL;
1017         struct ocfs2_inode_info *oi = OCFS2_I(d_inode(dentry));
1018
1019         if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
1020                 return -EOPNOTSUPP;
1021
1022         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1023                 return ret;
1024
1025         ret = ocfs2_inode_lock(d_inode(dentry), &di_bh, 0);
1026         if (ret < 0) {
1027                 mlog_errno(ret);
1028                 return ret;
1029         }
1030
1031         di = (struct ocfs2_dinode *)di_bh->b_data;
1032
1033         down_read(&oi->ip_xattr_sem);
1034         i_ret = ocfs2_xattr_ibody_list(d_inode(dentry), di, buffer, size);
1035         if (i_ret < 0)
1036                 b_ret = 0;
1037         else {
1038                 if (buffer) {
1039                         buffer += i_ret;
1040                         size -= i_ret;
1041                 }
1042                 b_ret = ocfs2_xattr_block_list(d_inode(dentry), di,
1043                                                buffer, size);
1044                 if (b_ret < 0)
1045                         i_ret = 0;
1046         }
1047         up_read(&oi->ip_xattr_sem);
1048         ocfs2_inode_unlock(d_inode(dentry), 0);
1049
1050         brelse(di_bh);
1051
1052         return i_ret + b_ret;
1053 }
1054
1055 static int ocfs2_xattr_find_entry(int name_index,
1056                                   const char *name,
1057                                   struct ocfs2_xattr_search *xs)
1058 {
1059         struct ocfs2_xattr_entry *entry;
1060         size_t name_len;
1061         int i, cmp = 1;
1062
1063         if (name == NULL)
1064                 return -EINVAL;
1065
1066         name_len = strlen(name);
1067         entry = xs->here;
1068         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
1069                 cmp = name_index - ocfs2_xattr_get_type(entry);
1070                 if (!cmp)
1071                         cmp = name_len - entry->xe_name_len;
1072                 if (!cmp)
1073                         cmp = memcmp(name, (xs->base +
1074                                      le16_to_cpu(entry->xe_name_offset)),
1075                                      name_len);
1076                 if (cmp == 0)
1077                         break;
1078                 entry += 1;
1079         }
1080         xs->here = entry;
1081
1082         return cmp ? -ENODATA : 0;
1083 }
1084
1085 static int ocfs2_xattr_get_value_outside(struct inode *inode,
1086                                          struct ocfs2_xattr_value_root *xv,
1087                                          void *buffer,
1088                                          size_t len)
1089 {
1090         u32 cpos, p_cluster, num_clusters, bpc, clusters;
1091         u64 blkno;
1092         int i, ret = 0;
1093         size_t cplen, blocksize;
1094         struct buffer_head *bh = NULL;
1095         struct ocfs2_extent_list *el;
1096
1097         el = &xv->xr_list;
1098         clusters = le32_to_cpu(xv->xr_clusters);
1099         bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1100         blocksize = inode->i_sb->s_blocksize;
1101
1102         cpos = 0;
1103         while (cpos < clusters) {
1104                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1105                                                &num_clusters, el, NULL);
1106                 if (ret) {
1107                         mlog_errno(ret);
1108                         goto out;
1109                 }
1110
1111                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1112                 /* Copy ocfs2_xattr_value */
1113                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1114                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1115                                                &bh, NULL);
1116                         if (ret) {
1117                                 mlog_errno(ret);
1118                                 goto out;
1119                         }
1120
1121                         cplen = len >= blocksize ? blocksize : len;
1122                         memcpy(buffer, bh->b_data, cplen);
1123                         len -= cplen;
1124                         buffer += cplen;
1125
1126                         brelse(bh);
1127                         bh = NULL;
1128                         if (len == 0)
1129                                 break;
1130                 }
1131                 cpos += num_clusters;
1132         }
1133 out:
1134         return ret;
1135 }
1136
1137 static int ocfs2_xattr_ibody_get(struct inode *inode,
1138                                  int name_index,
1139                                  const char *name,
1140                                  void *buffer,
1141                                  size_t buffer_size,
1142                                  struct ocfs2_xattr_search *xs)
1143 {
1144         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1145         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1146         struct ocfs2_xattr_value_root *xv;
1147         size_t size;
1148         int ret = 0;
1149
1150         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
1151                 return -ENODATA;
1152
1153         xs->end = (void *)di + inode->i_sb->s_blocksize;
1154         xs->header = (struct ocfs2_xattr_header *)
1155                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1156         xs->base = (void *)xs->header;
1157         xs->here = xs->header->xh_entries;
1158
1159         ret = ocfs2_xattr_find_entry(name_index, name, xs);
1160         if (ret)
1161                 return ret;
1162         size = le64_to_cpu(xs->here->xe_value_size);
1163         if (buffer) {
1164                 if (size > buffer_size)
1165                         return -ERANGE;
1166                 if (ocfs2_xattr_is_local(xs->here)) {
1167                         memcpy(buffer, (void *)xs->base +
1168                                le16_to_cpu(xs->here->xe_name_offset) +
1169                                OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
1170                 } else {
1171                         xv = (struct ocfs2_xattr_value_root *)
1172                                 (xs->base + le16_to_cpu(
1173                                  xs->here->xe_name_offset) +
1174                                 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
1175                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1176                                                             buffer, size);
1177                         if (ret < 0) {
1178                                 mlog_errno(ret);
1179                                 return ret;
1180                         }
1181                 }
1182         }
1183
1184         return size;
1185 }
1186
1187 static int ocfs2_xattr_block_get(struct inode *inode,
1188                                  int name_index,
1189                                  const char *name,
1190                                  void *buffer,
1191                                  size_t buffer_size,
1192                                  struct ocfs2_xattr_search *xs)
1193 {
1194         struct ocfs2_xattr_block *xb;
1195         struct ocfs2_xattr_value_root *xv;
1196         size_t size;
1197         int ret = -ENODATA, name_offset, name_len, i;
1198         int uninitialized_var(block_off);
1199
1200         xs->bucket = ocfs2_xattr_bucket_new(inode);
1201         if (!xs->bucket) {
1202                 ret = -ENOMEM;
1203                 mlog_errno(ret);
1204                 goto cleanup;
1205         }
1206
1207         ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1208         if (ret) {
1209                 mlog_errno(ret);
1210                 goto cleanup;
1211         }
1212
1213         if (xs->not_found) {
1214                 ret = -ENODATA;
1215                 goto cleanup;
1216         }
1217
1218         xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1219         size = le64_to_cpu(xs->here->xe_value_size);
1220         if (buffer) {
1221                 ret = -ERANGE;
1222                 if (size > buffer_size)
1223                         goto cleanup;
1224
1225                 name_offset = le16_to_cpu(xs->here->xe_name_offset);
1226                 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1227                 i = xs->here - xs->header->xh_entries;
1228
1229                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1230                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
1231                                                                 bucket_xh(xs->bucket),
1232                                                                 i,
1233                                                                 &block_off,
1234                                                                 &name_offset);
1235                         if (ret) {
1236                                 mlog_errno(ret);
1237                                 goto cleanup;
1238                         }
1239                         xs->base = bucket_block(xs->bucket, block_off);
1240                 }
1241                 if (ocfs2_xattr_is_local(xs->here)) {
1242                         memcpy(buffer, (void *)xs->base +
1243                                name_offset + name_len, size);
1244                 } else {
1245                         xv = (struct ocfs2_xattr_value_root *)
1246                                 (xs->base + name_offset + name_len);
1247                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1248                                                             buffer, size);
1249                         if (ret < 0) {
1250                                 mlog_errno(ret);
1251                                 goto cleanup;
1252                         }
1253                 }
1254         }
1255         ret = size;
1256 cleanup:
1257         ocfs2_xattr_bucket_free(xs->bucket);
1258
1259         brelse(xs->xattr_bh);
1260         xs->xattr_bh = NULL;
1261         return ret;
1262 }
1263
1264 int ocfs2_xattr_get_nolock(struct inode *inode,
1265                            struct buffer_head *di_bh,
1266                            int name_index,
1267                            const char *name,
1268                            void *buffer,
1269                            size_t buffer_size)
1270 {
1271         int ret;
1272         struct ocfs2_dinode *di = NULL;
1273         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1274         struct ocfs2_xattr_search xis = {
1275                 .not_found = -ENODATA,
1276         };
1277         struct ocfs2_xattr_search xbs = {
1278                 .not_found = -ENODATA,
1279         };
1280
1281         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1282                 return -EOPNOTSUPP;
1283
1284         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1285                 return -ENODATA;
1286
1287         xis.inode_bh = xbs.inode_bh = di_bh;
1288         di = (struct ocfs2_dinode *)di_bh->b_data;
1289
1290         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1291                                     buffer_size, &xis);
1292         if (ret == -ENODATA && di->i_xattr_loc)
1293                 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1294                                             buffer_size, &xbs);
1295
1296         return ret;
1297 }
1298
1299 /* ocfs2_xattr_get()
1300  *
1301  * Copy an extended attribute into the buffer provided.
1302  * Buffer is NULL to compute the size of buffer required.
1303  */
1304 static int ocfs2_xattr_get(struct inode *inode,
1305                            int name_index,
1306                            const char *name,
1307                            void *buffer,
1308                            size_t buffer_size)
1309 {
1310         int ret;
1311         struct buffer_head *di_bh = NULL;
1312
1313         ret = ocfs2_inode_lock(inode, &di_bh, 0);
1314         if (ret < 0) {
1315                 mlog_errno(ret);
1316                 return ret;
1317         }
1318         down_read(&OCFS2_I(inode)->ip_xattr_sem);
1319         ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1320                                      name, buffer, buffer_size);
1321         up_read(&OCFS2_I(inode)->ip_xattr_sem);
1322
1323         ocfs2_inode_unlock(inode, 0);
1324
1325         brelse(di_bh);
1326
1327         return ret;
1328 }
1329
1330 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1331                                            handle_t *handle,
1332                                            struct ocfs2_xattr_value_buf *vb,
1333                                            const void *value,
1334                                            int value_len)
1335 {
1336         int ret = 0, i, cp_len;
1337         u16 blocksize = inode->i_sb->s_blocksize;
1338         u32 p_cluster, num_clusters;
1339         u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1340         u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1341         u64 blkno;
1342         struct buffer_head *bh = NULL;
1343         unsigned int ext_flags;
1344         struct ocfs2_xattr_value_root *xv = vb->vb_xv;
1345
1346         BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1347
1348         while (cpos < clusters) {
1349                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1350                                                &num_clusters, &xv->xr_list,
1351                                                &ext_flags);
1352                 if (ret) {
1353                         mlog_errno(ret);
1354                         goto out;
1355                 }
1356
1357                 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1358
1359                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1360
1361                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1362                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1363                                                &bh, NULL);
1364                         if (ret) {
1365                                 mlog_errno(ret);
1366                                 goto out;
1367                         }
1368
1369                         ret = ocfs2_journal_access(handle,
1370                                                    INODE_CACHE(inode),
1371                                                    bh,
1372                                                    OCFS2_JOURNAL_ACCESS_WRITE);
1373                         if (ret < 0) {
1374                                 mlog_errno(ret);
1375                                 goto out;
1376                         }
1377
1378                         cp_len = value_len > blocksize ? blocksize : value_len;
1379                         memcpy(bh->b_data, value, cp_len);
1380                         value_len -= cp_len;
1381                         value += cp_len;
1382                         if (cp_len < blocksize)
1383                                 memset(bh->b_data + cp_len, 0,
1384                                        blocksize - cp_len);
1385
1386                         ocfs2_journal_dirty(handle, bh);
1387                         brelse(bh);
1388                         bh = NULL;
1389
1390                         /*
1391                          * XXX: do we need to empty all the following
1392                          * blocks in this cluster?
1393                          */
1394                         if (!value_len)
1395                                 break;
1396                 }
1397                 cpos += num_clusters;
1398         }
1399 out:
1400         brelse(bh);
1401
1402         return ret;
1403 }
1404
1405 static int ocfs2_xa_check_space_helper(int needed_space, int free_start,
1406                                        int num_entries)
1407 {
1408         int free_space;
1409
1410         if (!needed_space)
1411                 return 0;
1412
1413         free_space = free_start -
1414                 sizeof(struct ocfs2_xattr_header) -
1415                 (num_entries * sizeof(struct ocfs2_xattr_entry)) -
1416                 OCFS2_XATTR_HEADER_GAP;
1417         if (free_space < 0)
1418                 return -EIO;
1419         if (free_space < needed_space)
1420                 return -ENOSPC;
1421
1422         return 0;
1423 }
1424
1425 static int ocfs2_xa_journal_access(handle_t *handle, struct ocfs2_xa_loc *loc,
1426                                    int type)
1427 {
1428         return loc->xl_ops->xlo_journal_access(handle, loc, type);
1429 }
1430
1431 static void ocfs2_xa_journal_dirty(handle_t *handle, struct ocfs2_xa_loc *loc)
1432 {
1433         loc->xl_ops->xlo_journal_dirty(handle, loc);
1434 }
1435
1436 /* Give a pointer into the storage for the given offset */
1437 static void *ocfs2_xa_offset_pointer(struct ocfs2_xa_loc *loc, int offset)
1438 {
1439         BUG_ON(offset >= loc->xl_size);
1440         return loc->xl_ops->xlo_offset_pointer(loc, offset);
1441 }
1442
1443 /*
1444  * Wipe the name+value pair and allow the storage to reclaim it.  This
1445  * must be followed by either removal of the entry or a call to
1446  * ocfs2_xa_add_namevalue().
1447  */
1448 static void ocfs2_xa_wipe_namevalue(struct ocfs2_xa_loc *loc)
1449 {
1450         loc->xl_ops->xlo_wipe_namevalue(loc);
1451 }
1452
1453 /*
1454  * Find lowest offset to a name+value pair.  This is the start of our
1455  * downward-growing free space.
1456  */
1457 static int ocfs2_xa_get_free_start(struct ocfs2_xa_loc *loc)
1458 {
1459         return loc->xl_ops->xlo_get_free_start(loc);
1460 }
1461
1462 /* Can we reuse loc->xl_entry for xi? */
1463 static int ocfs2_xa_can_reuse_entry(struct ocfs2_xa_loc *loc,
1464                                     struct ocfs2_xattr_info *xi)
1465 {
1466         return loc->xl_ops->xlo_can_reuse(loc, xi);
1467 }
1468
1469 /* How much free space is needed to set the new value */
1470 static int ocfs2_xa_check_space(struct ocfs2_xa_loc *loc,
1471                                 struct ocfs2_xattr_info *xi)
1472 {
1473         return loc->xl_ops->xlo_check_space(loc, xi);
1474 }
1475
1476 static void ocfs2_xa_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1477 {
1478         loc->xl_ops->xlo_add_entry(loc, name_hash);
1479         loc->xl_entry->xe_name_hash = cpu_to_le32(name_hash);
1480         /*
1481          * We can't leave the new entry's xe_name_offset at zero or
1482          * add_namevalue() will go nuts.  We set it to the size of our
1483          * storage so that it can never be less than any other entry.
1484          */
1485         loc->xl_entry->xe_name_offset = cpu_to_le16(loc->xl_size);
1486 }
1487
1488 static void ocfs2_xa_add_namevalue(struct ocfs2_xa_loc *loc,
1489                                    struct ocfs2_xattr_info *xi)
1490 {
1491         int size = namevalue_size_xi(xi);
1492         int nameval_offset;
1493         char *nameval_buf;
1494
1495         loc->xl_ops->xlo_add_namevalue(loc, size);
1496         loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
1497         loc->xl_entry->xe_name_len = xi->xi_name_len;
1498         ocfs2_xattr_set_type(loc->xl_entry, xi->xi_name_index);
1499         ocfs2_xattr_set_local(loc->xl_entry,
1500                               xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE);
1501
1502         nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1503         nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
1504         memset(nameval_buf, 0, size);
1505         memcpy(nameval_buf, xi->xi_name, xi->xi_name_len);
1506 }
1507
1508 static void ocfs2_xa_fill_value_buf(struct ocfs2_xa_loc *loc,
1509                                     struct ocfs2_xattr_value_buf *vb)
1510 {
1511         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1512         int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
1513
1514         /* Value bufs are for value trees */
1515         BUG_ON(ocfs2_xattr_is_local(loc->xl_entry));
1516         BUG_ON(namevalue_size_xe(loc->xl_entry) !=
1517                (name_size + OCFS2_XATTR_ROOT_SIZE));
1518
1519         loc->xl_ops->xlo_fill_value_buf(loc, vb);
1520         vb->vb_xv =
1521                 (struct ocfs2_xattr_value_root *)ocfs2_xa_offset_pointer(loc,
1522                                                         nameval_offset +
1523                                                         name_size);
1524 }
1525
1526 static int ocfs2_xa_block_journal_access(handle_t *handle,
1527                                          struct ocfs2_xa_loc *loc, int type)
1528 {
1529         struct buffer_head *bh = loc->xl_storage;
1530         ocfs2_journal_access_func access;
1531
1532         if (loc->xl_size == (bh->b_size -
1533                              offsetof(struct ocfs2_xattr_block,
1534                                       xb_attrs.xb_header)))
1535                 access = ocfs2_journal_access_xb;
1536         else
1537                 access = ocfs2_journal_access_di;
1538         return access(handle, INODE_CACHE(loc->xl_inode), bh, type);
1539 }
1540
1541 static void ocfs2_xa_block_journal_dirty(handle_t *handle,
1542                                          struct ocfs2_xa_loc *loc)
1543 {
1544         struct buffer_head *bh = loc->xl_storage;
1545
1546         ocfs2_journal_dirty(handle, bh);
1547 }
1548
1549 static void *ocfs2_xa_block_offset_pointer(struct ocfs2_xa_loc *loc,
1550                                            int offset)
1551 {
1552         return (char *)loc->xl_header + offset;
1553 }
1554
1555 static int ocfs2_xa_block_can_reuse(struct ocfs2_xa_loc *loc,
1556                                     struct ocfs2_xattr_info *xi)
1557 {
1558         /*
1559          * Block storage is strict.  If the sizes aren't exact, we will
1560          * remove the old one and reinsert the new.
1561          */
1562         return namevalue_size_xe(loc->xl_entry) ==
1563                 namevalue_size_xi(xi);
1564 }
1565
1566 static int ocfs2_xa_block_get_free_start(struct ocfs2_xa_loc *loc)
1567 {
1568         struct ocfs2_xattr_header *xh = loc->xl_header;
1569         int i, count = le16_to_cpu(xh->xh_count);
1570         int offset, free_start = loc->xl_size;
1571
1572         for (i = 0; i < count; i++) {
1573                 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1574                 if (offset < free_start)
1575                         free_start = offset;
1576         }
1577
1578         return free_start;
1579 }
1580
1581 static int ocfs2_xa_block_check_space(struct ocfs2_xa_loc *loc,
1582                                       struct ocfs2_xattr_info *xi)
1583 {
1584         int count = le16_to_cpu(loc->xl_header->xh_count);
1585         int free_start = ocfs2_xa_get_free_start(loc);
1586         int needed_space = ocfs2_xi_entry_usage(xi);
1587
1588         /*
1589          * Block storage will reclaim the original entry before inserting
1590          * the new value, so we only need the difference.  If the new
1591          * entry is smaller than the old one, we don't need anything.
1592          */
1593         if (loc->xl_entry) {
1594                 /* Don't need space if we're reusing! */
1595                 if (ocfs2_xa_can_reuse_entry(loc, xi))
1596                         needed_space = 0;
1597                 else
1598                         needed_space -= ocfs2_xe_entry_usage(loc->xl_entry);
1599         }
1600         if (needed_space < 0)
1601                 needed_space = 0;
1602         return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1603 }
1604
1605 /*
1606  * Block storage for xattrs keeps the name+value pairs compacted.  When
1607  * we remove one, we have to shift any that preceded it towards the end.
1608  */
1609 static void ocfs2_xa_block_wipe_namevalue(struct ocfs2_xa_loc *loc)
1610 {
1611         int i, offset;
1612         int namevalue_offset, first_namevalue_offset, namevalue_size;
1613         struct ocfs2_xattr_entry *entry = loc->xl_entry;
1614         struct ocfs2_xattr_header *xh = loc->xl_header;
1615         int count = le16_to_cpu(xh->xh_count);
1616
1617         namevalue_offset = le16_to_cpu(entry->xe_name_offset);
1618         namevalue_size = namevalue_size_xe(entry);
1619         first_namevalue_offset = ocfs2_xa_get_free_start(loc);
1620
1621         /* Shift the name+value pairs */
1622         memmove((char *)xh + first_namevalue_offset + namevalue_size,
1623                 (char *)xh + first_namevalue_offset,
1624                 namevalue_offset - first_namevalue_offset);
1625         memset((char *)xh + first_namevalue_offset, 0, namevalue_size);
1626
1627         /* Now tell xh->xh_entries about it */
1628         for (i = 0; i < count; i++) {
1629                 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1630                 if (offset <= namevalue_offset)
1631                         le16_add_cpu(&xh->xh_entries[i].xe_name_offset,
1632                                      namevalue_size);
1633         }
1634
1635         /*
1636          * Note that we don't update xh_free_start or xh_name_value_len
1637          * because they're not used in block-stored xattrs.
1638          */
1639 }
1640
1641 static void ocfs2_xa_block_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1642 {
1643         int count = le16_to_cpu(loc->xl_header->xh_count);
1644         loc->xl_entry = &(loc->xl_header->xh_entries[count]);
1645         le16_add_cpu(&loc->xl_header->xh_count, 1);
1646         memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1647 }
1648
1649 static void ocfs2_xa_block_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1650 {
1651         int free_start = ocfs2_xa_get_free_start(loc);
1652
1653         loc->xl_entry->xe_name_offset = cpu_to_le16(free_start - size);
1654 }
1655
1656 static void ocfs2_xa_block_fill_value_buf(struct ocfs2_xa_loc *loc,
1657                                           struct ocfs2_xattr_value_buf *vb)
1658 {
1659         struct buffer_head *bh = loc->xl_storage;
1660
1661         if (loc->xl_size == (bh->b_size -
1662                              offsetof(struct ocfs2_xattr_block,
1663                                       xb_attrs.xb_header)))
1664                 vb->vb_access = ocfs2_journal_access_xb;
1665         else
1666                 vb->vb_access = ocfs2_journal_access_di;
1667         vb->vb_bh = bh;
1668 }
1669
1670 /*
1671  * Operations for xattrs stored in blocks.  This includes inline inode
1672  * storage and unindexed ocfs2_xattr_blocks.
1673  */
1674 static const struct ocfs2_xa_loc_operations ocfs2_xa_block_loc_ops = {
1675         .xlo_journal_access     = ocfs2_xa_block_journal_access,
1676         .xlo_journal_dirty      = ocfs2_xa_block_journal_dirty,
1677         .xlo_offset_pointer     = ocfs2_xa_block_offset_pointer,
1678         .xlo_check_space        = ocfs2_xa_block_check_space,
1679         .xlo_can_reuse          = ocfs2_xa_block_can_reuse,
1680         .xlo_get_free_start     = ocfs2_xa_block_get_free_start,
1681         .xlo_wipe_namevalue     = ocfs2_xa_block_wipe_namevalue,
1682         .xlo_add_entry          = ocfs2_xa_block_add_entry,
1683         .xlo_add_namevalue      = ocfs2_xa_block_add_namevalue,
1684         .xlo_fill_value_buf     = ocfs2_xa_block_fill_value_buf,
1685 };
1686
1687 static int ocfs2_xa_bucket_journal_access(handle_t *handle,
1688                                           struct ocfs2_xa_loc *loc, int type)
1689 {
1690         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1691
1692         return ocfs2_xattr_bucket_journal_access(handle, bucket, type);
1693 }
1694
1695 static void ocfs2_xa_bucket_journal_dirty(handle_t *handle,
1696                                           struct ocfs2_xa_loc *loc)
1697 {
1698         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1699
1700         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
1701 }
1702
1703 static void *ocfs2_xa_bucket_offset_pointer(struct ocfs2_xa_loc *loc,
1704                                             int offset)
1705 {
1706         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1707         int block, block_offset;
1708
1709         /* The header is at the front of the bucket */
1710         block = offset >> loc->xl_inode->i_sb->s_blocksize_bits;
1711         block_offset = offset % loc->xl_inode->i_sb->s_blocksize;
1712
1713         return bucket_block(bucket, block) + block_offset;
1714 }
1715
1716 static int ocfs2_xa_bucket_can_reuse(struct ocfs2_xa_loc *loc,
1717                                      struct ocfs2_xattr_info *xi)
1718 {
1719         return namevalue_size_xe(loc->xl_entry) >=
1720                 namevalue_size_xi(xi);
1721 }
1722
1723 static int ocfs2_xa_bucket_get_free_start(struct ocfs2_xa_loc *loc)
1724 {
1725         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1726         return le16_to_cpu(bucket_xh(bucket)->xh_free_start);
1727 }
1728
1729 static int ocfs2_bucket_align_free_start(struct super_block *sb,
1730                                          int free_start, int size)
1731 {
1732         /*
1733          * We need to make sure that the name+value pair fits within
1734          * one block.
1735          */
1736         if (((free_start - size) >> sb->s_blocksize_bits) !=
1737             ((free_start - 1) >> sb->s_blocksize_bits))
1738                 free_start -= free_start % sb->s_blocksize;
1739
1740         return free_start;
1741 }
1742
1743 static int ocfs2_xa_bucket_check_space(struct ocfs2_xa_loc *loc,
1744                                        struct ocfs2_xattr_info *xi)
1745 {
1746         int rc;
1747         int count = le16_to_cpu(loc->xl_header->xh_count);
1748         int free_start = ocfs2_xa_get_free_start(loc);
1749         int needed_space = ocfs2_xi_entry_usage(xi);
1750         int size = namevalue_size_xi(xi);
1751         struct super_block *sb = loc->xl_inode->i_sb;
1752
1753         /*
1754          * Bucket storage does not reclaim name+value pairs it cannot
1755          * reuse.  They live as holes until the bucket fills, and then
1756          * the bucket is defragmented.  However, the bucket can reclaim
1757          * the ocfs2_xattr_entry.
1758          */
1759         if (loc->xl_entry) {
1760                 /* Don't need space if we're reusing! */
1761                 if (ocfs2_xa_can_reuse_entry(loc, xi))
1762                         needed_space = 0;
1763                 else
1764                         needed_space -= sizeof(struct ocfs2_xattr_entry);
1765         }
1766         BUG_ON(needed_space < 0);
1767
1768         if (free_start < size) {
1769                 if (needed_space)
1770                         return -ENOSPC;
1771         } else {
1772                 /*
1773                  * First we check if it would fit in the first place.
1774                  * Below, we align the free start to a block.  This may
1775                  * slide us below the minimum gap.  By checking unaligned
1776                  * first, we avoid that error.
1777                  */
1778                 rc = ocfs2_xa_check_space_helper(needed_space, free_start,
1779                                                  count);
1780                 if (rc)
1781                         return rc;
1782                 free_start = ocfs2_bucket_align_free_start(sb, free_start,
1783                                                            size);
1784         }
1785         return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1786 }
1787
1788 static void ocfs2_xa_bucket_wipe_namevalue(struct ocfs2_xa_loc *loc)
1789 {
1790         le16_add_cpu(&loc->xl_header->xh_name_value_len,
1791                      -namevalue_size_xe(loc->xl_entry));
1792 }
1793
1794 static void ocfs2_xa_bucket_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1795 {
1796         struct ocfs2_xattr_header *xh = loc->xl_header;
1797         int count = le16_to_cpu(xh->xh_count);
1798         int low = 0, high = count - 1, tmp;
1799         struct ocfs2_xattr_entry *tmp_xe;
1800
1801         /*
1802          * We keep buckets sorted by name_hash, so we need to find
1803          * our insert place.
1804          */
1805         while (low <= high && count) {
1806                 tmp = (low + high) / 2;
1807                 tmp_xe = &xh->xh_entries[tmp];
1808
1809                 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
1810                         low = tmp + 1;
1811                 else if (name_hash < le32_to_cpu(tmp_xe->xe_name_hash))
1812                         high = tmp - 1;
1813                 else {
1814                         low = tmp;
1815                         break;
1816                 }
1817         }
1818
1819         if (low != count)
1820                 memmove(&xh->xh_entries[low + 1],
1821                         &xh->xh_entries[low],
1822                         ((count - low) * sizeof(struct ocfs2_xattr_entry)));
1823
1824         le16_add_cpu(&xh->xh_count, 1);
1825         loc->xl_entry = &xh->xh_entries[low];
1826         memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1827 }
1828
1829 static void ocfs2_xa_bucket_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1830 {
1831         int free_start = ocfs2_xa_get_free_start(loc);
1832         struct ocfs2_xattr_header *xh = loc->xl_header;
1833         struct super_block *sb = loc->xl_inode->i_sb;
1834         int nameval_offset;
1835
1836         free_start = ocfs2_bucket_align_free_start(sb, free_start, size);
1837         nameval_offset = free_start - size;
1838         loc->xl_entry->xe_name_offset = cpu_to_le16(nameval_offset);
1839         xh->xh_free_start = cpu_to_le16(nameval_offset);
1840         le16_add_cpu(&xh->xh_name_value_len, size);
1841
1842 }
1843
1844 static void ocfs2_xa_bucket_fill_value_buf(struct ocfs2_xa_loc *loc,
1845                                            struct ocfs2_xattr_value_buf *vb)
1846 {
1847         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1848         struct super_block *sb = loc->xl_inode->i_sb;
1849         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1850         int size = namevalue_size_xe(loc->xl_entry);
1851         int block_offset = nameval_offset >> sb->s_blocksize_bits;
1852
1853         /* Values are not allowed to straddle block boundaries */
1854         BUG_ON(block_offset !=
1855                ((nameval_offset + size - 1) >> sb->s_blocksize_bits));
1856         /* We expect the bucket to be filled in */
1857         BUG_ON(!bucket->bu_bhs[block_offset]);
1858
1859         vb->vb_access = ocfs2_journal_access;
1860         vb->vb_bh = bucket->bu_bhs[block_offset];
1861 }
1862
1863 /* Operations for xattrs stored in buckets. */
1864 static const struct ocfs2_xa_loc_operations ocfs2_xa_bucket_loc_ops = {
1865         .xlo_journal_access     = ocfs2_xa_bucket_journal_access,
1866         .xlo_journal_dirty      = ocfs2_xa_bucket_journal_dirty,
1867         .xlo_offset_pointer     = ocfs2_xa_bucket_offset_pointer,
1868         .xlo_check_space        = ocfs2_xa_bucket_check_space,
1869         .xlo_can_reuse          = ocfs2_xa_bucket_can_reuse,
1870         .xlo_get_free_start     = ocfs2_xa_bucket_get_free_start,
1871         .xlo_wipe_namevalue     = ocfs2_xa_bucket_wipe_namevalue,
1872         .xlo_add_entry          = ocfs2_xa_bucket_add_entry,
1873         .xlo_add_namevalue      = ocfs2_xa_bucket_add_namevalue,
1874         .xlo_fill_value_buf     = ocfs2_xa_bucket_fill_value_buf,
1875 };
1876
1877 static unsigned int ocfs2_xa_value_clusters(struct ocfs2_xa_loc *loc)
1878 {
1879         struct ocfs2_xattr_value_buf vb;
1880
1881         if (ocfs2_xattr_is_local(loc->xl_entry))
1882                 return 0;
1883
1884         ocfs2_xa_fill_value_buf(loc, &vb);
1885         return le32_to_cpu(vb.vb_xv->xr_clusters);
1886 }
1887
1888 static int ocfs2_xa_value_truncate(struct ocfs2_xa_loc *loc, u64 bytes,
1889                                    struct ocfs2_xattr_set_ctxt *ctxt)
1890 {
1891         int trunc_rc, access_rc;
1892         struct ocfs2_xattr_value_buf vb;
1893
1894         ocfs2_xa_fill_value_buf(loc, &vb);
1895         trunc_rc = ocfs2_xattr_value_truncate(loc->xl_inode, &vb, bytes,
1896                                               ctxt);
1897
1898         /*
1899          * The caller of ocfs2_xa_value_truncate() has already called
1900          * ocfs2_xa_journal_access on the loc.  However, The truncate code
1901          * calls ocfs2_extend_trans().  This may commit the previous
1902          * transaction and open a new one.  If this is a bucket, truncate
1903          * could leave only vb->vb_bh set up for journaling.  Meanwhile,
1904          * the caller is expecting to dirty the entire bucket.  So we must
1905          * reset the journal work.  We do this even if truncate has failed,
1906          * as it could have failed after committing the extend.
1907          */
1908         access_rc = ocfs2_xa_journal_access(ctxt->handle, loc,
1909                                             OCFS2_JOURNAL_ACCESS_WRITE);
1910
1911         /* Errors in truncate take precedence */
1912         return trunc_rc ? trunc_rc : access_rc;
1913 }
1914
1915 static void ocfs2_xa_remove_entry(struct ocfs2_xa_loc *loc)
1916 {
1917         int index, count;
1918         struct ocfs2_xattr_header *xh = loc->xl_header;
1919         struct ocfs2_xattr_entry *entry = loc->xl_entry;
1920
1921         ocfs2_xa_wipe_namevalue(loc);
1922         loc->xl_entry = NULL;
1923
1924         le16_add_cpu(&xh->xh_count, -1);
1925         count = le16_to_cpu(xh->xh_count);
1926
1927         /*
1928          * Only zero out the entry if there are more remaining.  This is
1929          * important for an empty bucket, as it keeps track of the
1930          * bucket's hash value.  It doesn't hurt empty block storage.
1931          */
1932         if (count) {
1933                 index = ((char *)entry - (char *)&xh->xh_entries) /
1934                         sizeof(struct ocfs2_xattr_entry);
1935                 memmove(&xh->xh_entries[index], &xh->xh_entries[index + 1],
1936                         (count - index) * sizeof(struct ocfs2_xattr_entry));
1937                 memset(&xh->xh_entries[count], 0,
1938                        sizeof(struct ocfs2_xattr_entry));
1939         }
1940 }
1941
1942 /*
1943  * If we have a problem adjusting the size of an external value during
1944  * ocfs2_xa_prepare_entry() or ocfs2_xa_remove(), we may have an xattr
1945  * in an intermediate state.  For example, the value may be partially
1946  * truncated.
1947  *
1948  * If the value tree hasn't changed, the extend/truncate went nowhere.
1949  * We have nothing to do.  The caller can treat it as a straight error.
1950  *
1951  * If the value tree got partially truncated, we now have a corrupted
1952  * extended attribute.  We're going to wipe its entry and leak the
1953  * clusters.  Better to leak some storage than leave a corrupt entry.
1954  *
1955  * If the value tree grew, it obviously didn't grow enough for the
1956  * new entry.  We're not going to try and reclaim those clusters either.
1957  * If there was already an external value there (orig_clusters != 0),
1958  * the new clusters are attached safely and we can just leave the old
1959  * value in place.  If there was no external value there, we remove
1960  * the entry.
1961  *
1962  * This way, the xattr block we store in the journal will be consistent.
1963  * If the size change broke because of the journal, no changes will hit
1964  * disk anyway.
1965  */
1966 static void ocfs2_xa_cleanup_value_truncate(struct ocfs2_xa_loc *loc,
1967                                             const char *what,
1968                                             unsigned int orig_clusters)
1969 {
1970         unsigned int new_clusters = ocfs2_xa_value_clusters(loc);
1971         char *nameval_buf = ocfs2_xa_offset_pointer(loc,
1972                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
1973
1974         if (new_clusters < orig_clusters) {
1975                 mlog(ML_ERROR,
1976                      "Partial truncate while %s xattr %.*s.  Leaking "
1977                      "%u clusters and removing the entry\n",
1978                      what, loc->xl_entry->xe_name_len, nameval_buf,
1979                      orig_clusters - new_clusters);
1980                 ocfs2_xa_remove_entry(loc);
1981         } else if (!orig_clusters) {
1982                 mlog(ML_ERROR,
1983                      "Unable to allocate an external value for xattr "
1984                      "%.*s safely.  Leaking %u clusters and removing the "
1985                      "entry\n",
1986                      loc->xl_entry->xe_name_len, nameval_buf,
1987                      new_clusters - orig_clusters);
1988                 ocfs2_xa_remove_entry(loc);
1989         } else if (new_clusters > orig_clusters)
1990                 mlog(ML_ERROR,
1991                      "Unable to grow xattr %.*s safely.  %u new clusters "
1992                      "have been added, but the value will not be "
1993                      "modified\n",
1994                      loc->xl_entry->xe_name_len, nameval_buf,
1995                      new_clusters - orig_clusters);
1996 }
1997
1998 static int ocfs2_xa_remove(struct ocfs2_xa_loc *loc,
1999                            struct ocfs2_xattr_set_ctxt *ctxt)
2000 {
2001         int rc = 0;
2002         unsigned int orig_clusters;
2003
2004         if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2005                 orig_clusters = ocfs2_xa_value_clusters(loc);
2006                 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2007                 if (rc) {
2008                         mlog_errno(rc);
2009                         /*
2010                          * Since this is remove, we can return 0 if
2011                          * ocfs2_xa_cleanup_value_truncate() is going to
2012                          * wipe the entry anyway.  So we check the
2013                          * cluster count as well.
2014                          */
2015                         if (orig_clusters != ocfs2_xa_value_clusters(loc))
2016                                 rc = 0;
2017                         ocfs2_xa_cleanup_value_truncate(loc, "removing",
2018                                                         orig_clusters);
2019                         if (rc)
2020                                 goto out;
2021                 }
2022         }
2023
2024         ocfs2_xa_remove_entry(loc);
2025
2026 out:
2027         return rc;
2028 }
2029
2030 static void ocfs2_xa_install_value_root(struct ocfs2_xa_loc *loc)
2031 {
2032         int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
2033         char *nameval_buf;
2034
2035         nameval_buf = ocfs2_xa_offset_pointer(loc,
2036                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
2037         memcpy(nameval_buf + name_size, &def_xv, OCFS2_XATTR_ROOT_SIZE);
2038 }
2039
2040 /*
2041  * Take an existing entry and make it ready for the new value.  This
2042  * won't allocate space, but it may free space.  It should be ready for
2043  * ocfs2_xa_prepare_entry() to finish the work.
2044  */
2045 static int ocfs2_xa_reuse_entry(struct ocfs2_xa_loc *loc,
2046                                 struct ocfs2_xattr_info *xi,
2047                                 struct ocfs2_xattr_set_ctxt *ctxt)
2048 {
2049         int rc = 0;
2050         int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2051         unsigned int orig_clusters;
2052         char *nameval_buf;
2053         int xe_local = ocfs2_xattr_is_local(loc->xl_entry);
2054         int xi_local = xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE;
2055
2056         BUG_ON(OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len) !=
2057                name_size);
2058
2059         nameval_buf = ocfs2_xa_offset_pointer(loc,
2060                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
2061         if (xe_local) {
2062                 memset(nameval_buf + name_size, 0,
2063                        namevalue_size_xe(loc->xl_entry) - name_size);
2064                 if (!xi_local)
2065                         ocfs2_xa_install_value_root(loc);
2066         } else {
2067                 orig_clusters = ocfs2_xa_value_clusters(loc);
2068                 if (xi_local) {
2069                         rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2070                         if (rc < 0)
2071                                 mlog_errno(rc);
2072                         else
2073                                 memset(nameval_buf + name_size, 0,
2074                                        namevalue_size_xe(loc->xl_entry) -
2075                                        name_size);
2076                 } else if (le64_to_cpu(loc->xl_entry->xe_value_size) >
2077                            xi->xi_value_len) {
2078                         rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len,
2079                                                      ctxt);
2080                         if (rc < 0)
2081                                 mlog_errno(rc);
2082                 }
2083
2084                 if (rc) {
2085                         ocfs2_xa_cleanup_value_truncate(loc, "reusing",
2086                                                         orig_clusters);
2087                         goto out;
2088                 }
2089         }
2090
2091         loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
2092         ocfs2_xattr_set_local(loc->xl_entry, xi_local);
2093
2094 out:
2095         return rc;
2096 }
2097
2098 /*
2099  * Prepares loc->xl_entry to receive the new xattr.  This includes
2100  * properly setting up the name+value pair region.  If loc->xl_entry
2101  * already exists, it will take care of modifying it appropriately.
2102  *
2103  * Note that this modifies the data.  You did journal_access already,
2104  * right?
2105  */
2106 static int ocfs2_xa_prepare_entry(struct ocfs2_xa_loc *loc,
2107                                   struct ocfs2_xattr_info *xi,
2108                                   u32 name_hash,
2109                                   struct ocfs2_xattr_set_ctxt *ctxt)
2110 {
2111         int rc = 0;
2112         unsigned int orig_clusters;
2113         __le64 orig_value_size = 0;
2114
2115         rc = ocfs2_xa_check_space(loc, xi);
2116         if (rc)
2117                 goto out;
2118
2119         if (loc->xl_entry) {
2120                 if (ocfs2_xa_can_reuse_entry(loc, xi)) {
2121                         orig_value_size = loc->xl_entry->xe_value_size;
2122                         rc = ocfs2_xa_reuse_entry(loc, xi, ctxt);
2123                         if (rc)
2124                                 goto out;
2125                         goto alloc_value;
2126                 }
2127
2128                 if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2129                         orig_clusters = ocfs2_xa_value_clusters(loc);
2130                         rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2131                         if (rc) {
2132                                 mlog_errno(rc);
2133                                 ocfs2_xa_cleanup_value_truncate(loc,
2134                                                                 "overwriting",
2135                                                                 orig_clusters);
2136                                 goto out;
2137                         }
2138                 }
2139                 ocfs2_xa_wipe_namevalue(loc);
2140         } else
2141                 ocfs2_xa_add_entry(loc, name_hash);
2142
2143         /*
2144          * If we get here, we have a blank entry.  Fill it.  We grow our
2145          * name+value pair back from the end.
2146          */
2147         ocfs2_xa_add_namevalue(loc, xi);
2148         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
2149                 ocfs2_xa_install_value_root(loc);
2150
2151 alloc_value:
2152         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2153                 orig_clusters = ocfs2_xa_value_clusters(loc);
2154                 rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len, ctxt);
2155                 if (rc < 0) {
2156                         ctxt->set_abort = 1;
2157                         ocfs2_xa_cleanup_value_truncate(loc, "growing",
2158                                                         orig_clusters);
2159                         /*
2160                          * If we were growing an existing value,
2161                          * ocfs2_xa_cleanup_value_truncate() won't remove
2162                          * the entry. We need to restore the original value
2163                          * size.
2164                          */
2165                         if (loc->xl_entry) {
2166                                 BUG_ON(!orig_value_size);
2167                                 loc->xl_entry->xe_value_size = orig_value_size;
2168                         }
2169                         mlog_errno(rc);
2170                 }
2171         }
2172
2173 out:
2174         return rc;
2175 }
2176
2177 /*
2178  * Store the value portion of the name+value pair.  This will skip
2179  * values that are stored externally.  Their tree roots were set up
2180  * by ocfs2_xa_prepare_entry().
2181  */
2182 static int ocfs2_xa_store_value(struct ocfs2_xa_loc *loc,
2183                                 struct ocfs2_xattr_info *xi,
2184                                 struct ocfs2_xattr_set_ctxt *ctxt)
2185 {
2186         int rc = 0;
2187         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
2188         int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2189         char *nameval_buf;
2190         struct ocfs2_xattr_value_buf vb;
2191
2192         nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
2193         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2194                 ocfs2_xa_fill_value_buf(loc, &vb);
2195                 rc = __ocfs2_xattr_set_value_outside(loc->xl_inode,
2196                                                      ctxt->handle, &vb,
2197                                                      xi->xi_value,
2198                                                      xi->xi_value_len);
2199         } else
2200                 memcpy(nameval_buf + name_size, xi->xi_value, xi->xi_value_len);
2201
2202         return rc;
2203 }
2204
2205 static int ocfs2_xa_set(struct ocfs2_xa_loc *loc,
2206                         struct ocfs2_xattr_info *xi,
2207                         struct ocfs2_xattr_set_ctxt *ctxt)
2208 {
2209         int ret;
2210         u32 name_hash = ocfs2_xattr_name_hash(loc->xl_inode, xi->xi_name,
2211                                               xi->xi_name_len);
2212
2213         ret = ocfs2_xa_journal_access(ctxt->handle, loc,
2214                                       OCFS2_JOURNAL_ACCESS_WRITE);
2215         if (ret) {
2216                 mlog_errno(ret);
2217                 goto out;
2218         }
2219
2220         /*
2221          * From here on out, everything is going to modify the buffer a
2222          * little.  Errors are going to leave the xattr header in a
2223          * sane state.  Thus, even with errors we dirty the sucker.
2224          */
2225
2226         /* Don't worry, we are never called with !xi_value and !xl_entry */
2227         if (!xi->xi_value) {
2228                 ret = ocfs2_xa_remove(loc, ctxt);
2229                 goto out_dirty;
2230         }
2231
2232         ret = ocfs2_xa_prepare_entry(loc, xi, name_hash, ctxt);
2233         if (ret) {
2234                 if (ret != -ENOSPC)
2235                         mlog_errno(ret);
2236                 goto out_dirty;
2237         }
2238
2239         ret = ocfs2_xa_store_value(loc, xi, ctxt);
2240         if (ret)
2241                 mlog_errno(ret);
2242
2243 out_dirty:
2244         ocfs2_xa_journal_dirty(ctxt->handle, loc);
2245
2246 out:
2247         return ret;
2248 }
2249
2250 static void ocfs2_init_dinode_xa_loc(struct ocfs2_xa_loc *loc,
2251                                      struct inode *inode,
2252                                      struct buffer_head *bh,
2253                                      struct ocfs2_xattr_entry *entry)
2254 {
2255         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2256
2257         BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_XATTR_FL));
2258
2259         loc->xl_inode = inode;
2260         loc->xl_ops = &ocfs2_xa_block_loc_ops;
2261         loc->xl_storage = bh;
2262         loc->xl_entry = entry;
2263         loc->xl_size = le16_to_cpu(di->i_xattr_inline_size);
2264         loc->xl_header =
2265                 (struct ocfs2_xattr_header *)(bh->b_data + bh->b_size -
2266                                               loc->xl_size);
2267 }
2268
2269 static void ocfs2_init_xattr_block_xa_loc(struct ocfs2_xa_loc *loc,
2270                                           struct inode *inode,
2271                                           struct buffer_head *bh,
2272                                           struct ocfs2_xattr_entry *entry)
2273 {
2274         struct ocfs2_xattr_block *xb =
2275                 (struct ocfs2_xattr_block *)bh->b_data;
2276
2277         BUG_ON(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED);
2278
2279         loc->xl_inode = inode;
2280         loc->xl_ops = &ocfs2_xa_block_loc_ops;
2281         loc->xl_storage = bh;
2282         loc->xl_header = &(xb->xb_attrs.xb_header);
2283         loc->xl_entry = entry;
2284         loc->xl_size = bh->b_size - offsetof(struct ocfs2_xattr_block,
2285                                              xb_attrs.xb_header);
2286 }
2287
2288 static void ocfs2_init_xattr_bucket_xa_loc(struct ocfs2_xa_loc *loc,
2289                                            struct ocfs2_xattr_bucket *bucket,
2290                                            struct ocfs2_xattr_entry *entry)
2291 {
2292         loc->xl_inode = bucket->bu_inode;
2293         loc->xl_ops = &ocfs2_xa_bucket_loc_ops;
2294         loc->xl_storage = bucket;
2295         loc->xl_header = bucket_xh(bucket);
2296         loc->xl_entry = entry;
2297         loc->xl_size = OCFS2_XATTR_BUCKET_SIZE;
2298 }
2299
2300 /*
2301  * In xattr remove, if it is stored outside and refcounted, we may have
2302  * the chance to split the refcount tree. So need the allocators.
2303  */
2304 static int ocfs2_lock_xattr_remove_allocators(struct inode *inode,
2305                                         struct ocfs2_xattr_value_root *xv,
2306                                         struct ocfs2_caching_info *ref_ci,
2307                                         struct buffer_head *ref_root_bh,
2308                                         struct ocfs2_alloc_context **meta_ac,
2309                                         int *ref_credits)
2310 {
2311         int ret, meta_add = 0;
2312         u32 p_cluster, num_clusters;
2313         unsigned int ext_flags;
2314
2315         *ref_credits = 0;
2316         ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
2317                                        &num_clusters,
2318                                        &xv->xr_list,
2319                                        &ext_flags);
2320         if (ret) {
2321                 mlog_errno(ret);
2322                 goto out;
2323         }
2324
2325         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
2326                 goto out;
2327
2328         ret = ocfs2_refcounted_xattr_delete_need(inode, ref_ci,
2329                                                  ref_root_bh, xv,
2330                                                  &meta_add, ref_credits);
2331         if (ret) {
2332                 mlog_errno(ret);
2333                 goto out;
2334         }
2335
2336         ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
2337                                                 meta_add, meta_ac);
2338         if (ret)
2339                 mlog_errno(ret);
2340
2341 out:
2342         return ret;
2343 }
2344
2345 static int ocfs2_remove_value_outside(struct inode*inode,
2346                                       struct ocfs2_xattr_value_buf *vb,
2347                                       struct ocfs2_xattr_header *header,
2348                                       struct ocfs2_caching_info *ref_ci,
2349                                       struct buffer_head *ref_root_bh)
2350 {
2351         int ret = 0, i, ref_credits;
2352         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2353         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2354         void *val;
2355
2356         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
2357
2358         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
2359                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
2360
2361                 if (ocfs2_xattr_is_local(entry))
2362                         continue;
2363
2364                 val = (void *)header +
2365                         le16_to_cpu(entry->xe_name_offset);
2366                 vb->vb_xv = (struct ocfs2_xattr_value_root *)
2367                         (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
2368
2369                 ret = ocfs2_lock_xattr_remove_allocators(inode, vb->vb_xv,
2370                                                          ref_ci, ref_root_bh,
2371                                                          &ctxt.meta_ac,
2372                                                          &ref_credits);
2373
2374                 ctxt.handle = ocfs2_start_trans(osb, ref_credits +
2375                                         ocfs2_remove_extent_credits(osb->sb));
2376                 if (IS_ERR(ctxt.handle)) {
2377                         ret = PTR_ERR(ctxt.handle);
2378                         mlog_errno(ret);
2379                         break;
2380                 }
2381
2382                 ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
2383
2384                 ocfs2_commit_trans(osb, ctxt.handle);
2385                 if (ctxt.meta_ac) {
2386                         ocfs2_free_alloc_context(ctxt.meta_ac);
2387                         ctxt.meta_ac = NULL;
2388                 }
2389
2390                 if (ret < 0) {
2391                         mlog_errno(ret);
2392                         break;
2393                 }
2394
2395         }
2396
2397         if (ctxt.meta_ac)
2398                 ocfs2_free_alloc_context(ctxt.meta_ac);
2399         ocfs2_schedule_truncate_log_flush(osb, 1);
2400         ocfs2_run_deallocs(osb, &ctxt.dealloc);
2401         return ret;
2402 }
2403
2404 static int ocfs2_xattr_ibody_remove(struct inode *inode,
2405                                     struct buffer_head *di_bh,
2406                                     struct ocfs2_caching_info *ref_ci,
2407                                     struct buffer_head *ref_root_bh)
2408 {
2409
2410         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2411         struct ocfs2_xattr_header *header;
2412         int ret;
2413         struct ocfs2_xattr_value_buf vb = {
2414                 .vb_bh = di_bh,
2415                 .vb_access = ocfs2_journal_access_di,
2416         };
2417
2418         header = (struct ocfs2_xattr_header *)
2419                  ((void *)di + inode->i_sb->s_blocksize -
2420                  le16_to_cpu(di->i_xattr_inline_size));
2421
2422         ret = ocfs2_remove_value_outside(inode, &vb, header,
2423                                          ref_ci, ref_root_bh);
2424
2425         return ret;
2426 }
2427
2428 struct ocfs2_rm_xattr_bucket_para {
2429         struct ocfs2_caching_info *ref_ci;
2430         struct buffer_head *ref_root_bh;
2431 };
2432
2433 static int ocfs2_xattr_block_remove(struct inode *inode,
2434                                     struct buffer_head *blk_bh,
2435                                     struct ocfs2_caching_info *ref_ci,
2436                                     struct buffer_head *ref_root_bh)
2437 {
2438         struct ocfs2_xattr_block *xb;
2439         int ret = 0;
2440         struct ocfs2_xattr_value_buf vb = {
2441                 .vb_bh = blk_bh,
2442                 .vb_access = ocfs2_journal_access_xb,
2443         };
2444         struct ocfs2_rm_xattr_bucket_para args = {
2445                 .ref_ci = ref_ci,
2446                 .ref_root_bh = ref_root_bh,
2447         };
2448
2449         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2450         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2451                 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
2452                 ret = ocfs2_remove_value_outside(inode, &vb, header,
2453                                                  ref_ci, ref_root_bh);
2454         } else
2455                 ret = ocfs2_iterate_xattr_index_block(inode,
2456                                                 blk_bh,
2457                                                 ocfs2_rm_xattr_cluster,
2458                                                 &args);
2459
2460         return ret;
2461 }
2462
2463 static int ocfs2_xattr_free_block(struct inode *inode,
2464                                   u64 block,
2465                                   struct ocfs2_caching_info *ref_ci,
2466                                   struct buffer_head *ref_root_bh)
2467 {
2468         struct inode *xb_alloc_inode;
2469         struct buffer_head *xb_alloc_bh = NULL;
2470         struct buffer_head *blk_bh = NULL;
2471         struct ocfs2_xattr_block *xb;
2472         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2473         handle_t *handle;
2474         int ret = 0;
2475         u64 blk, bg_blkno;
2476         u16 bit;
2477
2478         ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
2479         if (ret < 0) {
2480                 mlog_errno(ret);
2481                 goto out;
2482         }
2483
2484         ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
2485         if (ret < 0) {
2486                 mlog_errno(ret);
2487                 goto out;
2488         }
2489
2490         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2491         blk = le64_to_cpu(xb->xb_blkno);
2492         bit = le16_to_cpu(xb->xb_suballoc_bit);
2493         if (xb->xb_suballoc_loc)
2494                 bg_blkno = le64_to_cpu(xb->xb_suballoc_loc);
2495         else
2496                 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2497
2498         xb_alloc_inode = ocfs2_get_system_file_inode(osb,
2499                                 EXTENT_ALLOC_SYSTEM_INODE,
2500                                 le16_to_cpu(xb->xb_suballoc_slot));
2501         if (!xb_alloc_inode) {
2502                 ret = -ENOMEM;
2503                 mlog_errno(ret);
2504                 goto out;
2505         }
2506         mutex_lock(&xb_alloc_inode->i_mutex);
2507
2508         ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
2509         if (ret < 0) {
2510                 mlog_errno(ret);
2511                 goto out_mutex;
2512         }
2513
2514         handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
2515         if (IS_ERR(handle)) {
2516                 ret = PTR_ERR(handle);
2517                 mlog_errno(ret);
2518                 goto out_unlock;
2519         }
2520
2521         ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
2522                                        bit, bg_blkno, 1);
2523         if (ret < 0)
2524                 mlog_errno(ret);
2525
2526         ocfs2_commit_trans(osb, handle);
2527 out_unlock:
2528         ocfs2_inode_unlock(xb_alloc_inode, 1);
2529         brelse(xb_alloc_bh);
2530 out_mutex:
2531         mutex_unlock(&xb_alloc_inode->i_mutex);
2532         iput(xb_alloc_inode);
2533 out:
2534         brelse(blk_bh);
2535         return ret;
2536 }
2537
2538 /*
2539  * ocfs2_xattr_remove()
2540  *
2541  * Free extended attribute resources associated with this inode.
2542  */
2543 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
2544 {
2545         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2546         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2547         struct ocfs2_refcount_tree *ref_tree = NULL;
2548         struct buffer_head *ref_root_bh = NULL;
2549         struct ocfs2_caching_info *ref_ci = NULL;
2550         handle_t *handle;
2551         int ret;
2552
2553         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2554                 return 0;
2555
2556         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
2557                 return 0;
2558
2559         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
2560                 ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
2561                                                le64_to_cpu(di->i_refcount_loc),
2562                                                1, &ref_tree, &ref_root_bh);
2563                 if (ret) {
2564                         mlog_errno(ret);
2565                         goto out;
2566                 }
2567                 ref_ci = &ref_tree->rf_ci;
2568
2569         }
2570
2571         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2572                 ret = ocfs2_xattr_ibody_remove(inode, di_bh,
2573                                                ref_ci, ref_root_bh);
2574                 if (ret < 0) {
2575                         mlog_errno(ret);
2576                         goto out;
2577                 }
2578         }
2579
2580         if (di->i_xattr_loc) {
2581                 ret = ocfs2_xattr_free_block(inode,
2582                                              le64_to_cpu(di->i_xattr_loc),
2583                                              ref_ci, ref_root_bh);
2584                 if (ret < 0) {
2585                         mlog_errno(ret);
2586                         goto out;
2587                 }
2588         }
2589
2590         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
2591                                    OCFS2_INODE_UPDATE_CREDITS);
2592         if (IS_ERR(handle)) {
2593                 ret = PTR_ERR(handle);
2594                 mlog_errno(ret);
2595                 goto out;
2596         }
2597         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2598                                       OCFS2_JOURNAL_ACCESS_WRITE);
2599         if (ret) {
2600                 mlog_errno(ret);
2601                 goto out_commit;
2602         }
2603
2604         di->i_xattr_loc = 0;
2605
2606         spin_lock(&oi->ip_lock);
2607         oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
2608         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2609         spin_unlock(&oi->ip_lock);
2610         ocfs2_update_inode_fsync_trans(handle, inode, 0);
2611
2612         ocfs2_journal_dirty(handle, di_bh);
2613 out_commit:
2614         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2615 out:
2616         if (ref_tree)
2617                 ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
2618         brelse(ref_root_bh);
2619         return ret;
2620 }
2621
2622 static int ocfs2_xattr_has_space_inline(struct inode *inode,
2623                                         struct ocfs2_dinode *di)
2624 {
2625         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2626         unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
2627         int free;
2628
2629         if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
2630                 return 0;
2631
2632         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2633                 struct ocfs2_inline_data *idata = &di->id2.i_data;
2634                 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
2635         } else if (ocfs2_inode_is_fast_symlink(inode)) {
2636                 free = ocfs2_fast_symlink_chars(inode->i_sb) -
2637                         le64_to_cpu(di->i_size);
2638         } else {
2639                 struct ocfs2_extent_list *el = &di->id2.i_list;
2640                 free = (le16_to_cpu(el->l_count) -
2641                         le16_to_cpu(el->l_next_free_rec)) *
2642                         sizeof(struct ocfs2_extent_rec);
2643         }
2644         if (free >= xattrsize)
2645                 return 1;
2646
2647         return 0;
2648 }
2649
2650 /*
2651  * ocfs2_xattr_ibody_find()
2652  *
2653  * Find extended attribute in inode block and
2654  * fill search info into struct ocfs2_xattr_search.
2655  */
2656 static int ocfs2_xattr_ibody_find(struct inode *inode,
2657                                   int name_index,
2658                                   const char *name,
2659                                   struct ocfs2_xattr_search *xs)
2660 {
2661         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2662         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2663         int ret;
2664         int has_space = 0;
2665
2666         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2667                 return 0;
2668
2669         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2670                 down_read(&oi->ip_alloc_sem);
2671                 has_space = ocfs2_xattr_has_space_inline(inode, di);
2672                 up_read(&oi->ip_alloc_sem);
2673                 if (!has_space)
2674                         return 0;
2675         }
2676
2677         xs->xattr_bh = xs->inode_bh;
2678         xs->end = (void *)di + inode->i_sb->s_blocksize;
2679         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2680                 xs->header = (struct ocfs2_xattr_header *)
2681                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
2682         else
2683                 xs->header = (struct ocfs2_xattr_header *)
2684                         (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2685         xs->base = (void *)xs->header;
2686         xs->here = xs->header->xh_entries;
2687
2688         /* Find the named attribute. */
2689         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2690                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2691                 if (ret && ret != -ENODATA)
2692                         return ret;
2693                 xs->not_found = ret;
2694         }
2695
2696         return 0;
2697 }
2698
2699 static int ocfs2_xattr_ibody_init(struct inode *inode,
2700                                   struct buffer_head *di_bh,
2701                                   struct ocfs2_xattr_set_ctxt *ctxt)
2702 {
2703         int ret;
2704         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2705         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2706         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2707         unsigned int xattrsize = osb->s_xattr_inline_size;
2708
2709         if (!ocfs2_xattr_has_space_inline(inode, di)) {
2710                 ret = -ENOSPC;
2711                 goto out;
2712         }
2713
2714         ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode), di_bh,
2715                                       OCFS2_JOURNAL_ACCESS_WRITE);
2716         if (ret) {
2717                 mlog_errno(ret);
2718                 goto out;
2719         }
2720
2721         /*
2722          * Adjust extent record count or inline data size
2723          * to reserve space for extended attribute.
2724          */
2725         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2726                 struct ocfs2_inline_data *idata = &di->id2.i_data;
2727                 le16_add_cpu(&idata->id_count, -xattrsize);
2728         } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
2729                 struct ocfs2_extent_list *el = &di->id2.i_list;
2730                 le16_add_cpu(&el->l_count, -(xattrsize /
2731                                              sizeof(struct ocfs2_extent_rec)));
2732         }
2733         di->i_xattr_inline_size = cpu_to_le16(xattrsize);
2734
2735         spin_lock(&oi->ip_lock);
2736         oi->ip_dyn_features |= OCFS2_INLINE_XATTR_FL|OCFS2_HAS_XATTR_FL;
2737         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2738         spin_unlock(&oi->ip_lock);
2739
2740         ocfs2_journal_dirty(ctxt->handle, di_bh);
2741
2742 out:
2743         return ret;
2744 }
2745
2746 /*
2747  * ocfs2_xattr_ibody_set()
2748  *
2749  * Set, replace or remove an extended attribute into inode block.
2750  *
2751  */
2752 static int ocfs2_xattr_ibody_set(struct inode *inode,
2753                                  struct ocfs2_xattr_info *xi,
2754                                  struct ocfs2_xattr_search *xs,
2755                                  struct ocfs2_xattr_set_ctxt *ctxt)
2756 {
2757         int ret;
2758         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2759         struct ocfs2_xa_loc loc;
2760
2761         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2762                 return -ENOSPC;
2763
2764         down_write(&oi->ip_alloc_sem);
2765         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2766                 ret = ocfs2_xattr_ibody_init(inode, xs->inode_bh, ctxt);
2767                 if (ret) {
2768                         if (ret != -ENOSPC)
2769                                 mlog_errno(ret);
2770                         goto out;
2771                 }
2772         }
2773
2774         ocfs2_init_dinode_xa_loc(&loc, inode, xs->inode_bh,
2775                                  xs->not_found ? NULL : xs->here);
2776         ret = ocfs2_xa_set(&loc, xi, ctxt);
2777         if (ret) {
2778                 if (ret != -ENOSPC)
2779                         mlog_errno(ret);
2780                 goto out;
2781         }
2782         xs->here = loc.xl_entry;
2783
2784 out:
2785         up_write(&oi->ip_alloc_sem);
2786
2787         return ret;
2788 }
2789
2790 /*
2791  * ocfs2_xattr_block_find()
2792  *
2793  * Find extended attribute in external block and
2794  * fill search info into struct ocfs2_xattr_search.
2795  */
2796 static int ocfs2_xattr_block_find(struct inode *inode,
2797                                   int name_index,
2798                                   const char *name,
2799                                   struct ocfs2_xattr_search *xs)
2800 {
2801         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2802         struct buffer_head *blk_bh = NULL;
2803         struct ocfs2_xattr_block *xb;
2804         int ret = 0;
2805
2806         if (!di->i_xattr_loc)
2807                 return ret;
2808
2809         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2810                                      &blk_bh);
2811         if (ret < 0) {
2812                 mlog_errno(ret);
2813                 return ret;
2814         }
2815
2816         xs->xattr_bh = blk_bh;
2817         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2818
2819         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2820                 xs->header = &xb->xb_attrs.xb_header;
2821                 xs->base = (void *)xs->header;
2822                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2823                 xs->here = xs->header->xh_entries;
2824
2825                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2826         } else
2827                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2828                                                    name_index,
2829                                                    name, xs);
2830
2831         if (ret && ret != -ENODATA) {
2832                 xs->xattr_bh = NULL;
2833                 goto cleanup;
2834         }
2835         xs->not_found = ret;
2836         return 0;
2837 cleanup:
2838         brelse(blk_bh);
2839
2840         return ret;
2841 }
2842
2843 static int ocfs2_create_xattr_block(struct inode *inode,
2844                                     struct buffer_head *inode_bh,
2845                                     struct ocfs2_xattr_set_ctxt *ctxt,
2846                                     int indexed,
2847                                     struct buffer_head **ret_bh)
2848 {
2849         int ret;
2850         u16 suballoc_bit_start;
2851         u32 num_got;
2852         u64 suballoc_loc, first_blkno;
2853         struct ocfs2_dinode *di =  (struct ocfs2_dinode *)inode_bh->b_data;
2854         struct buffer_head *new_bh = NULL;
2855         struct ocfs2_xattr_block *xblk;
2856
2857         ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2858                                       inode_bh, OCFS2_JOURNAL_ACCESS_CREATE);
2859         if (ret < 0) {
2860                 mlog_errno(ret);
2861                 goto end;
2862         }
2863
2864         ret = ocfs2_claim_metadata(ctxt->handle, ctxt->meta_ac, 1,
2865                                    &suballoc_loc, &suballoc_bit_start,
2866                                    &num_got, &first_blkno);
2867         if (ret < 0) {
2868                 mlog_errno(ret);
2869                 goto end;
2870         }
2871
2872         new_bh = sb_getblk(inode->i_sb, first_blkno);
2873         if (!new_bh) {
2874                 ret = -ENOMEM;
2875                 mlog_errno(ret);
2876                 goto end;
2877         }
2878
2879         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2880
2881         ret = ocfs2_journal_access_xb(ctxt->handle, INODE_CACHE(inode),
2882                                       new_bh,
2883                                       OCFS2_JOURNAL_ACCESS_CREATE);
2884         if (ret < 0) {
2885                 mlog_errno(ret);
2886                 goto end;
2887         }
2888
2889         /* Initialize ocfs2_xattr_block */
2890         xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2891         memset(xblk, 0, inode->i_sb->s_blocksize);
2892         strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2893         xblk->xb_suballoc_slot = cpu_to_le16(ctxt->meta_ac->ac_alloc_slot);
2894         xblk->xb_suballoc_loc = cpu_to_le64(suballoc_loc);
2895         xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2896         xblk->xb_fs_generation =
2897                 cpu_to_le32(OCFS2_SB(inode->i_sb)->fs_generation);
2898         xblk->xb_blkno = cpu_to_le64(first_blkno);
2899         if (indexed) {
2900                 struct ocfs2_xattr_tree_root *xr = &xblk->xb_attrs.xb_root;
2901                 xr->xt_clusters = cpu_to_le32(1);
2902                 xr->xt_last_eb_blk = 0;
2903                 xr->xt_list.l_tree_depth = 0;
2904                 xr->xt_list.l_count = cpu_to_le16(
2905                                         ocfs2_xattr_recs_per_xb(inode->i_sb));
2906                 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2907                 xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
2908         }
2909         ocfs2_journal_dirty(ctxt->handle, new_bh);
2910
2911         /* Add it to the inode */
2912         di->i_xattr_loc = cpu_to_le64(first_blkno);
2913
2914         spin_lock(&OCFS2_I(inode)->ip_lock);
2915         OCFS2_I(inode)->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
2916         di->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
2917         spin_unlock(&OCFS2_I(inode)->ip_lock);
2918
2919         ocfs2_journal_dirty(ctxt->handle, inode_bh);
2920
2921         *ret_bh = new_bh;
2922         new_bh = NULL;
2923
2924 end:
2925         brelse(new_bh);
2926         return ret;
2927 }
2928
2929 /*
2930  * ocfs2_xattr_block_set()
2931  *
2932  * Set, replace or remove an extended attribute into external block.
2933  *
2934  */
2935 static int ocfs2_xattr_block_set(struct inode *inode,
2936                                  struct ocfs2_xattr_info *xi,
2937                                  struct ocfs2_xattr_search *xs,
2938                                  struct ocfs2_xattr_set_ctxt *ctxt)
2939 {
2940         struct buffer_head *new_bh = NULL;
2941         struct ocfs2_xattr_block *xblk = NULL;
2942         int ret;
2943         struct ocfs2_xa_loc loc;
2944
2945         if (!xs->xattr_bh) {
2946                 ret = ocfs2_create_xattr_block(inode, xs->inode_bh, ctxt,
2947                                                0, &new_bh);
2948                 if (ret) {
2949                         mlog_errno(ret);
2950                         goto end;
2951                 }
2952
2953                 xs->xattr_bh = new_bh;
2954                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2955                 xs->header = &xblk->xb_attrs.xb_header;
2956                 xs->base = (void *)xs->header;
2957                 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2958                 xs->here = xs->header->xh_entries;
2959         } else
2960                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2961
2962         if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2963                 ocfs2_init_xattr_block_xa_loc(&loc, inode, xs->xattr_bh,
2964                                               xs->not_found ? NULL : xs->here);
2965
2966                 ret = ocfs2_xa_set(&loc, xi, ctxt);
2967                 if (!ret)
2968                         xs->here = loc.xl_entry;
2969                 else if ((ret != -ENOSPC) || ctxt->set_abort)
2970                         goto end;
2971                 else {
2972                         ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2973                         if (ret)
2974                                 goto end;
2975                 }
2976         }
2977
2978         if (le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)
2979                 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2980
2981 end:
2982         return ret;
2983 }
2984
2985 /* Check whether the new xattr can be inserted into the inode. */
2986 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2987                                        struct ocfs2_xattr_info *xi,
2988                                        struct ocfs2_xattr_search *xs)
2989 {
2990         struct ocfs2_xattr_entry *last;
2991         int free, i;
2992         size_t min_offs = xs->end - xs->base;
2993
2994         if (!xs->header)
2995                 return 0;
2996
2997         last = xs->header->xh_entries;
2998
2999         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
3000                 size_t offs = le16_to_cpu(last->xe_name_offset);
3001                 if (offs < min_offs)
3002                         min_offs = offs;
3003                 last += 1;
3004         }
3005
3006         free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
3007         if (free < 0)
3008                 return 0;
3009
3010         BUG_ON(!xs->not_found);
3011
3012         if (free >= (sizeof(struct ocfs2_xattr_entry) + namevalue_size_xi(xi)))
3013                 return 1;
3014
3015         return 0;
3016 }
3017
3018 static int ocfs2_calc_xattr_set_need(struct inode *inode,
3019                                      struct ocfs2_dinode *di,
3020                                      struct ocfs2_xattr_info *xi,
3021                                      struct ocfs2_xattr_search *xis,
3022                                      struct ocfs2_xattr_search *xbs,
3023                                      int *clusters_need,
3024                                      int *meta_need,
3025                                      int *credits_need)
3026 {
3027         int ret = 0, old_in_xb = 0;
3028         int clusters_add = 0, meta_add = 0, credits = 0;
3029         struct buffer_head *bh = NULL;
3030         struct ocfs2_xattr_block *xb = NULL;
3031         struct ocfs2_xattr_entry *xe = NULL;
3032         struct ocfs2_xattr_value_root *xv = NULL;
3033         char *base = NULL;
3034         int name_offset, name_len = 0;
3035         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3036                                                     xi->xi_value_len);
3037         u64 value_size;
3038
3039         /*
3040          * Calculate the clusters we need to write.
3041          * No matter whether we replace an old one or add a new one,
3042          * we need this for writing.
3043          */
3044         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
3045                 credits += new_clusters *
3046                            ocfs2_clusters_to_blocks(inode->i_sb, 1);
3047
3048         if (xis->not_found && xbs->not_found) {
3049                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3050
3051                 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3052                         clusters_add += new_clusters;
3053                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3054                                                         &def_xv.xv.xr_list);
3055                 }
3056
3057                 goto meta_guess;
3058         }
3059
3060         if (!xis->not_found) {
3061                 xe = xis->here;
3062                 name_offset = le16_to_cpu(xe->xe_name_offset);
3063                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3064                 base = xis->base;
3065                 credits += OCFS2_INODE_UPDATE_CREDITS;
3066         } else {
3067                 int i, block_off = 0;
3068                 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3069                 xe = xbs->here;
3070                 name_offset = le16_to_cpu(xe->xe_name_offset);
3071                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3072                 i = xbs->here - xbs->header->xh_entries;
3073                 old_in_xb = 1;
3074
3075                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3076                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3077                                                         bucket_xh(xbs->bucket),
3078                                                         i, &block_off,
3079                                                         &name_offset);
3080                         base = bucket_block(xbs->bucket, block_off);
3081                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3082                 } else {
3083                         base = xbs->base;
3084                         credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
3085                 }
3086         }
3087
3088         /*
3089          * delete a xattr doesn't need metadata and cluster allocation.
3090          * so just calculate the credits and return.
3091          *
3092          * The credits for removing the value tree will be extended
3093          * by ocfs2_remove_extent itself.
3094          */
3095         if (!xi->xi_value) {
3096                 if (!ocfs2_xattr_is_local(xe))
3097                         credits += ocfs2_remove_extent_credits(inode->i_sb);
3098
3099                 goto out;
3100         }
3101
3102         /* do cluster allocation guess first. */
3103         value_size = le64_to_cpu(xe->xe_value_size);
3104
3105         if (old_in_xb) {
3106                 /*
3107                  * In xattr set, we always try to set the xe in inode first,
3108                  * so if it can be inserted into inode successfully, the old
3109                  * one will be removed from the xattr block, and this xattr
3110                  * will be inserted into inode as a new xattr in inode.
3111                  */
3112                 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
3113                         clusters_add += new_clusters;
3114                         credits += ocfs2_remove_extent_credits(inode->i_sb) +
3115                                     OCFS2_INODE_UPDATE_CREDITS;
3116                         if (!ocfs2_xattr_is_local(xe))
3117                                 credits += ocfs2_calc_extend_credits(
3118                                                         inode->i_sb,
3119                                                         &def_xv.xv.xr_list);
3120                         goto out;
3121                 }
3122         }
3123
3124         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3125                 /* the new values will be stored outside. */
3126                 u32 old_clusters = 0;
3127
3128                 if (!ocfs2_xattr_is_local(xe)) {
3129                         old_clusters =  ocfs2_clusters_for_bytes(inode->i_sb,
3130                                                                  value_size);
3131                         xv = (struct ocfs2_xattr_value_root *)
3132                              (base + name_offset + name_len);
3133                         value_size = OCFS2_XATTR_ROOT_SIZE;
3134                 } else
3135                         xv = &def_xv.xv;
3136
3137                 if (old_clusters >= new_clusters) {
3138                         credits += ocfs2_remove_extent_credits(inode->i_sb);
3139                         goto out;
3140                 } else {
3141                         meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
3142                         clusters_add += new_clusters - old_clusters;
3143                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3144                                                              &xv->xr_list);
3145                         if (value_size >= OCFS2_XATTR_ROOT_SIZE)
3146                                 goto out;
3147                 }
3148         } else {
3149                 /*
3150                  * Now the new value will be stored inside. So if the new
3151                  * value is smaller than the size of value root or the old
3152                  * value, we don't need any allocation, otherwise we have
3153                  * to guess metadata allocation.
3154                  */
3155                 if ((ocfs2_xattr_is_local(xe) &&
3156                      (value_size >= xi->xi_value_len)) ||
3157                     (!ocfs2_xattr_is_local(xe) &&
3158                      OCFS2_XATTR_ROOT_SIZE >= xi->xi_value_len))
3159                         goto out;
3160         }
3161
3162 meta_guess:
3163         /* calculate metadata allocation. */
3164         if (di->i_xattr_loc) {
3165                 if (!xbs->xattr_bh) {
3166                         ret = ocfs2_read_xattr_block(inode,
3167                                                      le64_to_cpu(di->i_xattr_loc),
3168                                                      &bh);
3169                         if (ret) {
3170                                 mlog_errno(ret);
3171                                 goto out;
3172                         }
3173
3174                         xb = (struct ocfs2_xattr_block *)bh->b_data;
3175                 } else
3176                         xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3177
3178                 /*
3179                  * If there is already an xattr tree, good, we can calculate
3180                  * like other b-trees. Otherwise we may have the chance of
3181                  * create a tree, the credit calculation is borrowed from
3182                  * ocfs2_calc_extend_credits with root_el = NULL. And the
3183                  * new tree will be cluster based, so no meta is needed.
3184                  */
3185                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3186                         struct ocfs2_extent_list *el =
3187                                  &xb->xb_attrs.xb_root.xt_list;
3188                         meta_add += ocfs2_extend_meta_needed(el);
3189                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3190                                                              el);
3191                 } else
3192                         credits += OCFS2_SUBALLOC_ALLOC + 1;
3193
3194                 /*
3195                  * This cluster will be used either for new bucket or for
3196                  * new xattr block.
3197                  * If the cluster size is the same as the bucket size, one
3198                  * more is needed since we may need to extend the bucket
3199                  * also.
3200                  */
3201                 clusters_add += 1;
3202                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3203                 if (OCFS2_XATTR_BUCKET_SIZE ==
3204                         OCFS2_SB(inode->i_sb)->s_clustersize) {
3205                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3206                         clusters_add += 1;
3207                 }
3208         } else {
3209                 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
3210                 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3211                         struct ocfs2_extent_list *el = &def_xv.xv.xr_list;
3212                         meta_add += ocfs2_extend_meta_needed(el);
3213                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3214                                                              el);
3215                 } else {
3216                         meta_add += 1;
3217                 }
3218         }
3219 out:
3220         if (clusters_need)
3221                 *clusters_need = clusters_add;
3222         if (meta_need)
3223                 *meta_need = meta_add;
3224         if (credits_need)
3225                 *credits_need = credits;
3226         brelse(bh);
3227         return ret;
3228 }
3229
3230 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
3231                                      struct ocfs2_dinode *di,
3232                                      struct ocfs2_xattr_info *xi,
3233                                      struct ocfs2_xattr_search *xis,
3234                                      struct ocfs2_xattr_search *xbs,
3235                                      struct ocfs2_xattr_set_ctxt *ctxt,
3236                                      int extra_meta,
3237                                      int *credits)
3238 {
3239         int clusters_add, meta_add, ret;
3240         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3241
3242         memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
3243
3244         ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
3245
3246         ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
3247                                         &clusters_add, &meta_add, credits);
3248         if (ret) {
3249                 mlog_errno(ret);
3250                 return ret;
3251         }
3252
3253         meta_add += extra_meta;
3254         trace_ocfs2_init_xattr_set_ctxt(xi->xi_name, meta_add,
3255                                         clusters_add, *credits);
3256
3257         if (meta_add) {
3258                 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
3259                                                         &ctxt->meta_ac);
3260                 if (ret) {
3261                         mlog_errno(ret);
3262                         goto out;
3263                 }
3264         }
3265
3266         if (clusters_add) {
3267                 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
3268                 if (ret)
3269                         mlog_errno(ret);
3270         }
3271 out:
3272         if (ret) {
3273                 if (ctxt->meta_ac) {
3274                         ocfs2_free_alloc_context(ctxt->meta_ac);
3275                         ctxt->meta_ac = NULL;
3276                 }
3277
3278                 /*
3279                  * We cannot have an error and a non null ctxt->data_ac.
3280                  */
3281         }
3282
3283         return ret;
3284 }
3285
3286 static int __ocfs2_xattr_set_handle(struct inode *inode,
3287                                     struct ocfs2_dinode *di,
3288                                     struct ocfs2_xattr_info *xi,
3289                                     struct ocfs2_xattr_search *xis,
3290                                     struct ocfs2_xattr_search *xbs,
3291                                     struct ocfs2_xattr_set_ctxt *ctxt)
3292 {
3293         int ret = 0, credits, old_found;
3294
3295         if (!xi->xi_value) {
3296                 /* Remove existing extended attribute */
3297                 if (!xis->not_found)
3298                         ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3299                 else if (!xbs->not_found)
3300                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3301         } else {
3302                 /* We always try to set extended attribute into inode first*/
3303                 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3304                 if (!ret && !xbs->not_found) {
3305                         /*
3306                          * If succeed and that extended attribute existing in
3307                          * external block, then we will remove it.
3308                          */
3309                         xi->xi_value = NULL;
3310                         xi->xi_value_len = 0;
3311
3312                         old_found = xis->not_found;
3313                         xis->not_found = -ENODATA;
3314                         ret = ocfs2_calc_xattr_set_need(inode,
3315                                                         di,
3316                                                         xi,
3317                                                         xis,
3318                                                         xbs,
3319                                                         NULL,
3320                                                         NULL,
3321                                                         &credits);
3322                         xis->not_found = old_found;
3323                         if (ret) {
3324                                 mlog_errno(ret);
3325                                 goto out;
3326                         }
3327
3328                         ret = ocfs2_extend_trans(ctxt->handle, credits);
3329                         if (ret) {
3330                                 mlog_errno(ret);
3331                                 goto out;
3332                         }
3333                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3334                 } else if ((ret == -ENOSPC) && !ctxt->set_abort) {
3335                         if (di->i_xattr_loc && !xbs->xattr_bh) {
3336                                 ret = ocfs2_xattr_block_find(inode,
3337                                                              xi->xi_name_index,
3338                                                              xi->xi_name, xbs);
3339                                 if (ret)
3340                                         goto out;
3341
3342                                 old_found = xis->not_found;
3343                                 xis->not_found = -ENODATA;
3344                                 ret = ocfs2_calc_xattr_set_need(inode,
3345                                                                 di,
3346                                                                 xi,
3347                                                                 xis,
3348                                                                 xbs,
3349                                                                 NULL,
3350                                                                 NULL,
3351                                                                 &credits);
3352                                 xis->not_found = old_found;
3353                                 if (ret) {
3354                                         mlog_errno(ret);
3355                                         goto out;
3356                                 }
3357
3358                                 ret = ocfs2_extend_trans(ctxt->handle, credits);
3359                                 if (ret) {
3360                                         mlog_errno(ret);
3361                                         goto out;
3362                                 }
3363                         }
3364                         /*
3365                          * If no space in inode, we will set extended attribute
3366                          * into external block.
3367                          */
3368                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3369                         if (ret)
3370                                 goto out;
3371                         if (!xis->not_found) {
3372                                 /*
3373                                  * If succeed and that extended attribute
3374                                  * existing in inode, we will remove it.
3375                                  */
3376                                 xi->xi_value = NULL;
3377                                 xi->xi_value_len = 0;
3378                                 xbs->not_found = -ENODATA;
3379                                 ret = ocfs2_calc_xattr_set_need(inode,
3380                                                                 di,
3381                                                                 xi,
3382                                                                 xis,
3383                                                                 xbs,
3384                                                                 NULL,
3385                                                                 NULL,
3386                                                                 &credits);
3387                                 if (ret) {
3388                                         mlog_errno(ret);
3389                                         goto out;
3390                                 }
3391
3392                                 ret = ocfs2_extend_trans(ctxt->handle, credits);
3393                                 if (ret) {
3394                                         mlog_errno(ret);
3395                                         goto out;
3396                                 }
3397                                 ret = ocfs2_xattr_ibody_set(inode, xi,
3398                                                             xis, ctxt);
3399                         }
3400                 }
3401         }
3402
3403         if (!ret) {
3404                 /* Update inode ctime. */
3405                 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
3406                                               xis->inode_bh,
3407                                               OCFS2_JOURNAL_ACCESS_WRITE);
3408                 if (ret) {
3409                         mlog_errno(ret);
3410                         goto out;
3411                 }
3412
3413                 inode->i_ctime = CURRENT_TIME;
3414                 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3415                 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3416                 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
3417         }
3418 out:
3419         return ret;
3420 }
3421
3422 /*
3423  * This function only called duing creating inode
3424  * for init security/acl xattrs of the new inode.
3425  * All transanction credits have been reserved in mknod.
3426  */
3427 int ocfs2_xattr_set_handle(handle_t *handle,
3428                            struct inode *inode,
3429                            struct buffer_head *di_bh,
3430                            int name_index,
3431                            const char *name,
3432                            const void *value,
3433                            size_t value_len,
3434                            int flags,
3435                            struct ocfs2_alloc_context *meta_ac,
3436                            struct ocfs2_alloc_context *data_ac)
3437 {
3438         struct ocfs2_dinode *di;
3439         int ret;
3440
3441         struct ocfs2_xattr_info xi = {
3442                 .xi_name_index = name_index,
3443                 .xi_name = name,
3444                 .xi_name_len = strlen(name),
3445                 .xi_value = value,
3446                 .xi_value_len = value_len,
3447         };
3448
3449         struct ocfs2_xattr_search xis = {
3450                 .not_found = -ENODATA,
3451         };
3452
3453         struct ocfs2_xattr_search xbs = {
3454                 .not_found = -ENODATA,
3455         };
3456
3457         struct ocfs2_xattr_set_ctxt ctxt = {
3458                 .handle = handle,
3459                 .meta_ac = meta_ac,
3460                 .data_ac = data_ac,
3461         };
3462
3463         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3464                 return -EOPNOTSUPP;
3465
3466         /*
3467          * In extreme situation, may need xattr bucket when
3468          * block size is too small. And we have already reserved
3469          * the credits for bucket in mknod.
3470          */
3471         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
3472                 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3473                 if (!xbs.bucket) {
3474                         mlog_errno(-ENOMEM);
3475                         return -ENOMEM;
3476                 }
3477         }
3478
3479         xis.inode_bh = xbs.inode_bh = di_bh;
3480         di = (struct ocfs2_dinode *)di_bh->b_data;
3481
3482         down_write(&OCFS2_I(inode)->ip_xattr_sem);
3483
3484         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3485         if (ret)
3486                 goto cleanup;
3487         if (xis.not_found) {
3488                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3489                 if (ret)
3490                         goto cleanup;
3491         }
3492
3493         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3494
3495 cleanup:
3496         up_write(&OCFS2_I(inode)->ip_xattr_sem);
3497         brelse(xbs.xattr_bh);
3498         ocfs2_xattr_bucket_free(xbs.bucket);
3499
3500         return ret;
3501 }
3502
3503 /*
3504  * ocfs2_xattr_set()
3505  *
3506  * Set, replace or remove an extended attribute for this inode.
3507  * value is NULL to remove an existing extended attribute, else either
3508  * create or replace an extended attribute.
3509  */
3510 int ocfs2_xattr_set(struct inode *inode,
3511                     int name_index,
3512                     const char *name,
3513                     const void *value,
3514                     size_t value_len,
3515                     int flags)
3516 {
3517         struct buffer_head *di_bh = NULL;
3518         struct ocfs2_dinode *di;
3519         int ret, credits, ref_meta = 0, ref_credits = 0;
3520         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3521         struct inode *tl_inode = osb->osb_tl_inode;
3522         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, NULL, };
3523         struct ocfs2_refcount_tree *ref_tree = NULL;
3524
3525         struct ocfs2_xattr_info xi = {
3526                 .xi_name_index = name_index,
3527                 .xi_name = name,
3528                 .xi_name_len = strlen(name),
3529                 .xi_value = value,
3530                 .xi_value_len = value_len,
3531         };
3532
3533         struct ocfs2_xattr_search xis = {
3534                 .not_found = -ENODATA,
3535         };
3536
3537         struct ocfs2_xattr_search xbs = {
3538                 .not_found = -ENODATA,
3539         };
3540
3541         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3542                 return -EOPNOTSUPP;
3543
3544         /*
3545          * Only xbs will be used on indexed trees.  xis doesn't need a
3546          * bucket.
3547          */
3548         xbs.bucket = ocfs2_xattr_bucket_new(inode);
3549         if (!xbs.bucket) {
3550                 mlog_errno(-ENOMEM);
3551                 return -ENOMEM;
3552         }
3553
3554         ret = ocfs2_inode_lock(inode, &di_bh, 1);
3555         if (ret < 0) {
3556                 mlog_errno(ret);
3557                 goto cleanup_nolock;
3558         }
3559         xis.inode_bh = xbs.inode_bh = di_bh;
3560         di = (struct ocfs2_dinode *)di_bh->b_data;
3561
3562         down_write(&OCFS2_I(inode)->ip_xattr_sem);
3563         /*
3564          * Scan inode and external block to find the same name
3565          * extended attribute and collect search information.
3566          */
3567         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3568         if (ret)
3569                 goto cleanup;
3570         if (xis.not_found) {
3571                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3572                 if (ret)
3573                         goto cleanup;
3574         }
3575
3576         if (xis.not_found && xbs.not_found) {
3577                 ret = -ENODATA;
3578                 if (flags & XATTR_REPLACE)
3579                         goto cleanup;
3580                 ret = 0;
3581                 if (!value)
3582                         goto cleanup;
3583         } else {
3584                 ret = -EEXIST;
3585                 if (flags & XATTR_CREATE)
3586                         goto cleanup;
3587         }
3588
3589         /* Check whether the value is refcounted and do some preparation. */
3590         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
3591             (!xis.not_found || !xbs.not_found)) {
3592                 ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
3593                                                    &xis, &xbs, &ref_tree,
3594                                                    &ref_meta, &ref_credits);
3595                 if (ret) {
3596                         mlog_errno(ret);
3597                         goto cleanup;
3598                 }
3599         }
3600
3601         mutex_lock(&tl_inode->i_mutex);
3602
3603         if (ocfs2_truncate_log_needs_flush(osb)) {
3604                 ret = __ocfs2_flush_truncate_log(osb);
3605                 if (ret < 0) {
3606                         mutex_unlock(&tl_inode->i_mutex);
3607                         mlog_errno(ret);
3608                         goto cleanup;
3609                 }
3610         }
3611         mutex_unlock(&tl_inode->i_mutex);
3612
3613         ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
3614                                         &xbs, &ctxt, ref_meta, &credits);
3615         if (ret) {
3616                 mlog_errno(ret);
3617                 goto cleanup;
3618         }
3619
3620         /* we need to update inode's ctime field, so add credit for it. */
3621         credits += OCFS2_INODE_UPDATE_CREDITS;
3622         ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
3623         if (IS_ERR(ctxt.handle)) {
3624                 ret = PTR_ERR(ctxt.handle);
3625                 mlog_errno(ret);
3626                 goto out_free_ac;
3627         }
3628
3629         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3630         ocfs2_update_inode_fsync_trans(ctxt.handle, inode, 0);
3631
3632         ocfs2_commit_trans(osb, ctxt.handle);
3633
3634 out_free_ac:
3635         if (ctxt.data_ac)
3636                 ocfs2_free_alloc_context(ctxt.data_ac);
3637         if (ctxt.meta_ac)
3638                 ocfs2_free_alloc_context(ctxt.meta_ac);
3639         if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
3640                 ocfs2_schedule_truncate_log_flush(osb, 1);
3641         ocfs2_run_deallocs(osb, &ctxt.dealloc);
3642
3643 cleanup:
3644         if (ref_tree)
3645                 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3646         up_write(&OCFS2_I(inode)->ip_xattr_sem);
3647         if (!value && !ret) {
3648                 ret = ocfs2_try_remove_refcount_tree(inode, di_bh);
3649                 if (ret)
3650                         mlog_errno(ret);
3651         }
3652         ocfs2_inode_unlock(inode, 1);
3653 cleanup_nolock:
3654         brelse(di_bh);
3655         brelse(xbs.xattr_bh);
3656         ocfs2_xattr_bucket_free(xbs.bucket);
3657
3658         return ret;
3659 }
3660
3661 /*
3662  * Find the xattr extent rec which may contains name_hash.
3663  * e_cpos will be the first name hash of the xattr rec.
3664  * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
3665  */
3666 static int ocfs2_xattr_get_rec(struct inode *inode,
3667                                u32 name_hash,
3668                                u64 *p_blkno,
3669                                u32 *e_cpos,
3670                                u32 *num_clusters,
3671                                struct ocfs2_extent_list *el)
3672 {
3673         int ret = 0, i;
3674         struct buffer_head *eb_bh = NULL;
3675         struct ocfs2_extent_block *eb;
3676         struct ocfs2_extent_rec *rec = NULL;
3677         u64 e_blkno = 0;
3678
3679         if (el->l_tree_depth) {
3680                 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
3681                                       &eb_bh);
3682                 if (ret) {
3683                         mlog_errno(ret);
3684                         goto out;
3685                 }
3686
3687                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
3688                 el = &eb->h_list;
3689
3690                 if (el->l_tree_depth) {
3691                         ret = ocfs2_error(inode->i_sb,
3692                                           "Inode %lu has non zero tree depth in xattr tree block %llu\n",
3693                                           inode->i_ino,
3694                                           (unsigned long long)eb_bh->b_blocknr);
3695                         goto out;
3696                 }
3697         }
3698
3699         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
3700                 rec = &el->l_recs[i];
3701
3702                 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
3703                         e_blkno = le64_to_cpu(rec->e_blkno);
3704                         break;
3705                 }
3706         }
3707
3708         if (!e_blkno) {
3709                 ret = ocfs2_error(inode->i_sb, "Inode %lu has bad extent record (%u, %u, 0) in xattr\n",
3710                                   inode->i_ino,
3711                                   le32_to_cpu(rec->e_cpos),
3712                                   ocfs2_rec_clusters(el, rec));
3713                 goto out;
3714         }
3715
3716         *p_blkno = le64_to_cpu(rec->e_blkno);
3717         *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
3718         if (e_cpos)
3719                 *e_cpos = le32_to_cpu(rec->e_cpos);
3720 out:
3721         brelse(eb_bh);
3722         return ret;
3723 }
3724
3725 typedef int (xattr_bucket_func)(struct inode *inode,
3726                                 struct ocfs2_xattr_bucket *bucket,
3727                                 void *para);
3728
3729 static int ocfs2_find_xe_in_bucket(struct inode *inode,
3730                                    struct ocfs2_xattr_bucket *bucket,
3731                                    int name_index,
3732                                    const char *name,
3733                                    u32 name_hash,
3734                                    u16 *xe_index,
3735                                    int *found)
3736 {
3737         int i, ret = 0, cmp = 1, block_off, new_offset;
3738         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3739         size_t name_len = strlen(name);
3740         struct ocfs2_xattr_entry *xe = NULL;
3741         char *xe_name;
3742
3743         /*
3744          * We don't use binary search in the bucket because there
3745          * may be multiple entries with the same name hash.
3746          */
3747         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3748                 xe = &xh->xh_entries[i];
3749
3750                 if (name_hash > le32_to_cpu(xe->xe_name_hash))
3751                         continue;
3752                 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3753                         break;
3754
3755                 cmp = name_index - ocfs2_xattr_get_type(xe);
3756                 if (!cmp)
3757                         cmp = name_len - xe->xe_name_len;
3758                 if (cmp)
3759                         continue;
3760
3761                 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3762                                                         xh,
3763                                                         i,
3764                                                         &block_off,
3765                                                         &new_offset);
3766                 if (ret) {
3767                         mlog_errno(ret);
3768                         break;
3769                 }
3770
3771
3772                 xe_name = bucket_block(bucket, block_off) + new_offset;
3773                 if (!memcmp(name, xe_name, name_len)) {
3774                         *xe_index = i;
3775                         *found = 1;
3776                         ret = 0;
3777                         break;
3778                 }
3779         }
3780
3781         return ret;
3782 }
3783
3784 /*
3785  * Find the specified xattr entry in a series of buckets.
3786  * This series start from p_blkno and last for num_clusters.
3787  * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3788  * the num of the valid buckets.
3789  *
3790  * Return the buffer_head this xattr should reside in. And if the xattr's
3791  * hash is in the gap of 2 buckets, return the lower bucket.
3792  */
3793 static int ocfs2_xattr_bucket_find(struct inode *inode,
3794                                    int name_index,
3795                                    const char *name,
3796                                    u32 name_hash,
3797                                    u64 p_blkno,
3798                                    u32 first_hash,
3799                                    u32 num_clusters,
3800                                    struct ocfs2_xattr_search *xs)
3801 {
3802         int ret, found = 0;
3803         struct ocfs2_xattr_header *xh = NULL;
3804         struct ocfs2_xattr_entry *xe = NULL;
3805         u16 index = 0;
3806         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3807         int low_bucket = 0, bucket, high_bucket;
3808         struct ocfs2_xattr_bucket *search;
3809         u32 last_hash;
3810         u64 blkno, lower_blkno = 0;
3811
3812         search = ocfs2_xattr_bucket_new(inode);
3813         if (!search) {
3814                 ret = -ENOMEM;
3815                 mlog_errno(ret);
3816                 goto out;
3817         }
3818
3819         ret = ocfs2_read_xattr_bucket(search, p_blkno);
3820         if (ret) {
3821                 mlog_errno(ret);
3822                 goto out;
3823         }
3824
3825         xh = bucket_xh(search);
3826         high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3827         while (low_bucket <= high_bucket) {
3828                 ocfs2_xattr_bucket_relse(search);
3829
3830                 bucket = (low_bucket + high_bucket) / 2;
3831                 blkno = p_blkno + bucket * blk_per_bucket;
3832                 ret = ocfs2_read_xattr_bucket(search, blkno);
3833                 if (ret) {
3834                         mlog_errno(ret);
3835                         goto out;
3836                 }
3837
3838                 xh = bucket_xh(search);
3839                 xe = &xh->xh_entries[0];
3840                 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3841                         high_bucket = bucket - 1;
3842                         continue;
3843                 }
3844
3845                 /*
3846                  * Check whether the hash of the last entry in our
3847                  * bucket is larger than the search one. for an empty
3848                  * bucket, the last one is also the first one.
3849                  */
3850                 if (xh->xh_count)
3851                         xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3852
3853                 last_hash = le32_to_cpu(xe->xe_name_hash);
3854
3855                 /* record lower_blkno which may be the insert place. */
3856                 lower_blkno = blkno;
3857
3858                 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3859                         low_bucket = bucket + 1;
3860                         continue;
3861                 }
3862
3863                 /* the searched xattr should reside in this bucket if exists. */
3864                 ret = ocfs2_find_xe_in_bucket(inode, search,
3865                                               name_index, name, name_hash,
3866                                               &index, &found);
3867                 if (ret) {
3868                         mlog_errno(ret);
3869                         goto out;
3870                 }
3871                 break;
3872         }
3873
3874         /*
3875          * Record the bucket we have found.
3876          * When the xattr's hash value is in the gap of 2 buckets, we will
3877          * always set it to the previous bucket.
3878          */
3879         if (!lower_blkno)
3880                 lower_blkno = p_blkno;
3881
3882         /* This should be in cache - we just read it during the search */
3883         ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3884         if (ret) {
3885                 mlog_errno(ret);
3886                 goto out;
3887         }
3888
3889         xs->header = bucket_xh(xs->bucket);
3890         xs->base = bucket_block(xs->bucket, 0);
3891         xs->end = xs->base + inode->i_sb->s_blocksize;
3892
3893         if (found) {
3894                 xs->here = &xs->header->xh_entries[index];
3895                 trace_ocfs2_xattr_bucket_find(OCFS2_I(inode)->ip_blkno,
3896                         name, name_index, name_hash,
3897                         (unsigned long long)bucket_blkno(xs->bucket),
3898                         index);
3899         } else
3900                 ret = -ENODATA;
3901
3902 out:
3903         ocfs2_xattr_bucket_free(search);
3904         return ret;
3905 }
3906
3907 static int ocfs2_xattr_index_block_find(struct inode *inode,
3908                                         struct buffer_head *root_bh,
3909                                         int name_index,
3910                                         const char *name,
3911                                         struct ocfs2_xattr_search *xs)
3912 {
3913         int ret;
3914         struct ocfs2_xattr_block *xb =
3915                         (struct ocfs2_xattr_block *)root_bh->b_data;
3916         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3917         struct ocfs2_extent_list *el = &xb_root->xt_list;
3918         u64 p_blkno = 0;
3919         u32 first_hash, num_clusters = 0;
3920         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3921
3922         if (le16_to_cpu(el->l_next_free_rec) == 0)
3923                 return -ENODATA;
3924
3925         trace_ocfs2_xattr_index_block_find(OCFS2_I(inode)->ip_blkno,
3926                                         name, name_index, name_hash,
3927                                         (unsigned long long)root_bh->b_blocknr,
3928                                         -1);
3929
3930         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3931                                   &num_clusters, el);
3932         if (ret) {
3933                 mlog_errno(ret);
3934                 goto out;
3935         }
3936
3937         BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3938
3939         trace_ocfs2_xattr_index_block_find_rec(OCFS2_I(inode)->ip_blkno,
3940                                         name, name_index, first_hash,
3941                                         (unsigned long long)p_blkno,
3942                                         num_clusters);
3943
3944         ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3945                                       p_blkno, first_hash, num_clusters, xs);
3946
3947 out:
3948         return ret;
3949 }
3950
3951 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3952                                        u64 blkno,
3953                                        u32 clusters,
3954                                        xattr_bucket_func *func,
3955                                        void *para)
3956 {
3957         int i, ret = 0;
3958         u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3959         u32 num_buckets = clusters * bpc;
3960         struct ocfs2_xattr_bucket *bucket;
3961
3962         bucket = ocfs2_xattr_bucket_new(inode);
3963         if (!bucket) {
3964                 mlog_errno(-ENOMEM);
3965                 return -ENOMEM;
3966         }
3967
3968         trace_ocfs2_iterate_xattr_buckets(
3969                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
3970                 (unsigned long long)blkno, clusters);
3971
3972         for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3973                 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3974                 if (ret) {
3975                         mlog_errno(ret);
3976                         break;
3977                 }
3978
3979                 /*
3980                  * The real bucket num in this series of blocks is stored
3981                  * in the 1st bucket.
3982                  */
3983                 if (i == 0)
3984                         num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3985
3986                 trace_ocfs2_iterate_xattr_bucket((unsigned long long)blkno,
3987                      le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3988                 if (func) {
3989                         ret = func(inode, bucket, para);
3990                         if (ret && ret != -ERANGE)
3991                                 mlog_errno(ret);
3992                         /* Fall through to bucket_relse() */
3993                 }
3994
3995                 ocfs2_xattr_bucket_relse(bucket);
3996                 if (ret)
3997                         break;
3998         }
3999
4000         ocfs2_xattr_bucket_free(bucket);
4001         return ret;
4002 }
4003
4004 struct ocfs2_xattr_tree_list {
4005         char *buffer;
4006         size_t buffer_size;
4007         size_t result;
4008 };
4009
4010 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
4011                                              struct ocfs2_xattr_header *xh,
4012                                              int index,
4013                                              int *block_off,
4014                                              int *new_offset)
4015 {
4016         u16 name_offset;
4017
4018         if (index < 0 || index >= le16_to_cpu(xh->xh_count))
4019                 return -EINVAL;
4020
4021         name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
4022
4023         *block_off = name_offset >> sb->s_blocksize_bits;
4024         *new_offset = name_offset % sb->s_blocksize;
4025
4026         return 0;
4027 }
4028
4029 static int ocfs2_list_xattr_bucket(struct inode *inode,
4030                                    struct ocfs2_xattr_bucket *bucket,
4031                                    void *para)
4032 {
4033         int ret = 0, type;
4034         struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
4035         int i, block_off, new_offset;
4036         const char *prefix, *name;
4037
4038         for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
4039                 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
4040                 type = ocfs2_xattr_get_type(entry);
4041                 prefix = ocfs2_xattr_prefix(type);
4042
4043                 if (prefix) {
4044                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
4045                                                                 bucket_xh(bucket),
4046                                                                 i,
4047                                                                 &block_off,
4048                                                                 &new_offset);
4049                         if (ret)
4050                                 break;
4051
4052                         name = (const char *)bucket_block(bucket, block_off) +
4053                                 new_offset;
4054                         ret = ocfs2_xattr_list_entry(xl->buffer,
4055                                                      xl->buffer_size,
4056                                                      &xl->result,
4057                                                      prefix, name,
4058                                                      entry->xe_name_len);
4059                         if (ret)
4060                                 break;
4061                 }
4062         }
4063
4064         return ret;
4065 }
4066
4067 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
4068                                            struct buffer_head *blk_bh,
4069                                            xattr_tree_rec_func *rec_func,
4070                                            void *para)
4071 {
4072         struct ocfs2_xattr_block *xb =
4073                         (struct ocfs2_xattr_block *)blk_bh->b_data;
4074         struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4075         int ret = 0;
4076         u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
4077         u64 p_blkno = 0;
4078
4079         if (!el->l_next_free_rec || !rec_func)
4080                 return 0;
4081
4082         while (name_hash > 0) {
4083                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4084                                           &e_cpos, &num_clusters, el);
4085                 if (ret) {
4086                         mlog_errno(ret);
4087                         break;
4088                 }
4089
4090                 ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
4091                                num_clusters, para);
4092                 if (ret) {
4093                         if (ret != -ERANGE)
4094                                 mlog_errno(ret);
4095                         break;
4096                 }
4097
4098                 if (e_cpos == 0)
4099                         break;
4100
4101                 name_hash = e_cpos - 1;
4102         }
4103
4104         return ret;
4105
4106 }
4107
4108 static int ocfs2_list_xattr_tree_rec(struct inode *inode,
4109                                      struct buffer_head *root_bh,
4110                                      u64 blkno, u32 cpos, u32 len, void *para)
4111 {
4112         return ocfs2_iterate_xattr_buckets(inode, blkno, len,
4113                                            ocfs2_list_xattr_bucket, para);
4114 }
4115
4116 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
4117                                              struct buffer_head *blk_bh,
4118                                              char *buffer,
4119                                              size_t buffer_size)
4120 {
4121         int ret;
4122         struct ocfs2_xattr_tree_list xl = {
4123                 .buffer = buffer,
4124                 .buffer_size = buffer_size,
4125                 .result = 0,
4126         };
4127
4128         ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
4129                                               ocfs2_list_xattr_tree_rec, &xl);
4130         if (ret) {
4131                 mlog_errno(ret);
4132                 goto out;
4133         }
4134
4135         ret = xl.result;
4136 out:
4137         return ret;
4138 }
4139
4140 static int cmp_xe(const void *a, const void *b)
4141 {
4142         const struct ocfs2_xattr_entry *l = a, *r = b;
4143         u32 l_hash = le32_to_cpu(l->xe_name_hash);
4144         u32 r_hash = le32_to_cpu(r->xe_name_hash);
4145
4146         if (l_hash > r_hash)
4147                 return 1;
4148         if (l_hash < r_hash)
4149                 return -1;
4150         return 0;
4151 }
4152
4153 static void swap_xe(void *a, void *b, int size)
4154 {
4155         struct ocfs2_xattr_entry *l = a, *r = b, tmp;
4156
4157         tmp = *l;
4158         memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
4159         memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
4160 }
4161
4162 /*
4163  * When the ocfs2_xattr_block is filled up, new bucket will be created
4164  * and all the xattr entries will be moved to the new bucket.
4165  * The header goes at the start of the bucket, and the names+values are
4166  * filled from the end.  This is why *target starts as the last buffer.
4167  * Note: we need to sort the entries since they are not saved in order
4168  * in the ocfs2_xattr_block.
4169  */
4170 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
4171                                            struct buffer_head *xb_bh,
4172                                            struct ocfs2_xattr_bucket *bucket)
4173 {
4174         int i, blocksize = inode->i_sb->s_blocksize;
4175         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4176         u16 offset, size, off_change;
4177         struct ocfs2_xattr_entry *xe;
4178         struct ocfs2_xattr_block *xb =
4179                                 (struct ocfs2_xattr_block *)xb_bh->b_data;
4180         struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
4181         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4182         u16 count = le16_to_cpu(xb_xh->xh_count);
4183         char *src = xb_bh->b_data;
4184         char *target = bucket_block(bucket, blks - 1);
4185
4186         trace_ocfs2_cp_xattr_block_to_bucket_begin(
4187                                 (unsigned long long)xb_bh->b_blocknr,
4188                                 (unsigned long long)bucket_blkno(bucket));
4189
4190         for (i = 0; i < blks; i++)
4191                 memset(bucket_block(bucket, i), 0, blocksize);
4192
4193         /*
4194          * Since the xe_name_offset is based on ocfs2_xattr_header,
4195          * there is a offset change corresponding to the change of
4196          * ocfs2_xattr_header's position.
4197          */
4198         off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4199         xe = &xb_xh->xh_entries[count - 1];
4200         offset = le16_to_cpu(xe->xe_name_offset) + off_change;
4201         size = blocksize - offset;
4202
4203         /* copy all the names and values. */
4204         memcpy(target + offset, src + offset, size);
4205
4206         /* Init new header now. */
4207         xh->xh_count = xb_xh->xh_count;
4208         xh->xh_num_buckets = cpu_to_le16(1);
4209         xh->xh_name_value_len = cpu_to_le16(size);
4210         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
4211
4212         /* copy all the entries. */
4213         target = bucket_block(bucket, 0);
4214         offset = offsetof(struct ocfs2_xattr_header, xh_entries);
4215         size = count * sizeof(struct ocfs2_xattr_entry);
4216         memcpy(target + offset, (char *)xb_xh + offset, size);
4217
4218         /* Change the xe offset for all the xe because of the move. */
4219         off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
4220                  offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4221         for (i = 0; i < count; i++)
4222                 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
4223
4224         trace_ocfs2_cp_xattr_block_to_bucket_end(offset, size, off_change);
4225
4226         sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
4227              cmp_xe, swap_xe);
4228 }
4229
4230 /*
4231  * After we move xattr from block to index btree, we have to
4232  * update ocfs2_xattr_search to the new xe and base.
4233  *
4234  * When the entry is in xattr block, xattr_bh indicates the storage place.
4235  * While if the entry is in index b-tree, "bucket" indicates the
4236  * real place of the xattr.
4237  */
4238 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
4239                                             struct ocfs2_xattr_search *xs,
4240                                             struct buffer_head *old_bh)
4241 {
4242         char *buf = old_bh->b_data;
4243         struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
4244         struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
4245         int i;
4246
4247         xs->header = bucket_xh(xs->bucket);
4248         xs->base = bucket_block(xs->bucket, 0);
4249         xs->end = xs->base + inode->i_sb->s_blocksize;
4250
4251         if (xs->not_found)
4252                 return;
4253
4254         i = xs->here - old_xh->xh_entries;
4255         xs->here = &xs->header->xh_entries[i];
4256 }
4257
4258 static int ocfs2_xattr_create_index_block(struct inode *inode,
4259                                           struct ocfs2_xattr_search *xs,
4260                                           struct ocfs2_xattr_set_ctxt *ctxt)
4261 {
4262         int ret;
4263         u32 bit_off, len;
4264         u64 blkno;
4265         handle_t *handle = ctxt->handle;
4266         struct ocfs2_inode_info *oi = OCFS2_I(inode);
4267         struct buffer_head *xb_bh = xs->xattr_bh;
4268         struct ocfs2_xattr_block *xb =
4269                         (struct ocfs2_xattr_block *)xb_bh->b_data;
4270         struct ocfs2_xattr_tree_root *xr;
4271         u16 xb_flags = le16_to_cpu(xb->xb_flags);
4272
4273         trace_ocfs2_xattr_create_index_block_begin(
4274                                 (unsigned long long)xb_bh->b_blocknr);
4275
4276         BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
4277         BUG_ON(!xs->bucket);
4278
4279         /*
4280          * XXX:
4281          * We can use this lock for now, and maybe move to a dedicated mutex
4282          * if performance becomes a problem later.
4283          */
4284         down_write(&oi->ip_alloc_sem);
4285
4286         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
4287                                       OCFS2_JOURNAL_ACCESS_WRITE);
4288         if (ret) {
4289                 mlog_errno(ret);
4290                 goto out;
4291         }
4292
4293         ret = __ocfs2_claim_clusters(handle, ctxt->data_ac,
4294                                      1, 1, &bit_off, &len);
4295         if (ret) {
4296                 mlog_errno(ret);
4297                 goto out;
4298         }
4299
4300         /*
4301          * The bucket may spread in many blocks, and
4302          * we will only touch the 1st block and the last block
4303          * in the whole bucket(one for entry and one for data).
4304          */
4305         blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
4306
4307         trace_ocfs2_xattr_create_index_block((unsigned long long)blkno);
4308
4309         ret = ocfs2_init_xattr_bucket(xs->bucket, blkno, 1);
4310         if (ret) {
4311                 mlog_errno(ret);
4312                 goto out;
4313         }
4314
4315         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4316                                                 OCFS2_JOURNAL_ACCESS_CREATE);
4317         if (ret) {
4318                 mlog_errno(ret);
4319                 goto out;
4320         }
4321
4322         ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
4323         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4324
4325         ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
4326
4327         /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
4328         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
4329                offsetof(struct ocfs2_xattr_block, xb_attrs));
4330
4331         xr = &xb->xb_attrs.xb_root;
4332         xr->xt_clusters = cpu_to_le32(1);
4333         xr->xt_last_eb_blk = 0;
4334         xr->xt_list.l_tree_depth = 0;
4335         xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
4336         xr->xt_list.l_next_free_rec = cpu_to_le16(1);
4337
4338         xr->xt_list.l_recs[0].e_cpos = 0;
4339         xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
4340         xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
4341
4342         xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
4343
4344         ocfs2_journal_dirty(handle, xb_bh);
4345
4346 out:
4347         up_write(&oi->ip_alloc_sem);
4348
4349         return ret;
4350 }
4351
4352 static int cmp_xe_offset(const void *a, const void *b)
4353 {
4354         const struct ocfs2_xattr_entry *l = a, *r = b;
4355         u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
4356         u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
4357
4358         if (l_name_offset < r_name_offset)
4359                 return 1;
4360         if (l_name_offset > r_name_offset)
4361                 return -1;
4362         return 0;
4363 }
4364
4365 /*
4366  * defrag a xattr bucket if we find that the bucket has some
4367  * holes beteen name/value pairs.
4368  * We will move all the name/value pairs to the end of the bucket
4369  * so that we can spare some space for insertion.
4370  */
4371 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
4372                                      handle_t *handle,
4373                                      struct ocfs2_xattr_bucket *bucket)
4374 {
4375         int ret, i;
4376         size_t end, offset, len;
4377         struct ocfs2_xattr_header *xh;
4378         char *entries, *buf, *bucket_buf = NULL;
4379         u64 blkno = bucket_blkno(bucket);
4380         u16 xh_free_start;
4381         size_t blocksize = inode->i_sb->s_blocksize;
4382         struct ocfs2_xattr_entry *xe;
4383
4384         /*
4385          * In order to make the operation more efficient and generic,
4386          * we copy all the blocks into a contiguous memory and do the
4387          * defragment there, so if anything is error, we will not touch
4388          * the real block.
4389          */
4390         bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
4391         if (!bucket_buf) {
4392                 ret = -EIO;
4393                 goto out;
4394         }
4395
4396         buf = bucket_buf;
4397         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4398                 memcpy(buf, bucket_block(bucket, i), blocksize);
4399
4400         ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
4401                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4402         if (ret < 0) {
4403                 mlog_errno(ret);
4404                 goto out;
4405         }
4406
4407         xh = (struct ocfs2_xattr_header *)bucket_buf;
4408         entries = (char *)xh->xh_entries;
4409         xh_free_start = le16_to_cpu(xh->xh_free_start);
4410
4411         trace_ocfs2_defrag_xattr_bucket(
4412              (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
4413              xh_free_start, le16_to_cpu(xh->xh_name_value_len));
4414
4415         /*
4416          * sort all the entries by their offset.
4417          * the largest will be the first, so that we can
4418          * move them to the end one by one.
4419          */
4420         sort(entries, le16_to_cpu(xh->xh_count),
4421              sizeof(struct ocfs2_xattr_entry),
4422              cmp_xe_offset, swap_xe);
4423
4424         /* Move all name/values to the end of the bucket. */
4425         xe = xh->xh_entries;
4426         end = OCFS2_XATTR_BUCKET_SIZE;
4427         for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
4428                 offset = le16_to_cpu(xe->xe_name_offset);
4429                 len = namevalue_size_xe(xe);
4430
4431                 /*
4432                  * We must make sure that the name/value pair
4433                  * exist in the same block. So adjust end to
4434                  * the previous block end if needed.
4435                  */
4436                 if (((end - len) / blocksize !=
4437                         (end - 1) / blocksize))
4438                         end = end - end % blocksize;
4439
4440                 if (end > offset + len) {
4441                         memmove(bucket_buf + end - len,
4442                                 bucket_buf + offset, len);
4443                         xe->xe_name_offset = cpu_to_le16(end - len);
4444                 }
4445
4446                 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
4447                                 "bucket %llu\n", (unsigned long long)blkno);
4448
4449                 end -= len;
4450         }
4451
4452         mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
4453                         "bucket %llu\n", (unsigned long long)blkno);
4454
4455         if (xh_free_start == end)
4456                 goto out;
4457
4458         memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
4459         xh->xh_free_start = cpu_to_le16(end);
4460
4461         /* sort the entries by their name_hash. */
4462         sort(entries, le16_to_cpu(xh->xh_count),
4463              sizeof(struct ocfs2_xattr_entry),
4464              cmp_xe, swap_xe);
4465
4466         buf = bucket_buf;
4467         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4468                 memcpy(bucket_block(bucket, i), buf, blocksize);
4469         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
4470
4471 out:
4472         kfree(bucket_buf);
4473         return ret;
4474 }
4475
4476 /*
4477  * prev_blkno points to the start of an existing extent.  new_blkno
4478  * points to a newly allocated extent.  Because we know each of our
4479  * clusters contains more than bucket, we can easily split one cluster
4480  * at a bucket boundary.  So we take the last cluster of the existing
4481  * extent and split it down the middle.  We move the last half of the
4482  * buckets in the last cluster of the existing extent over to the new
4483  * extent.
4484  *
4485  * first_bh is the buffer at prev_blkno so we can update the existing
4486  * extent's bucket count.  header_bh is the bucket were we were hoping
4487  * to insert our xattr.  If the bucket move places the target in the new
4488  * extent, we'll update first_bh and header_bh after modifying the old
4489  * extent.
4490  *
4491  * first_hash will be set as the 1st xe's name_hash in the new extent.
4492  */
4493 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
4494                                                handle_t *handle,
4495                                                struct ocfs2_xattr_bucket *first,
4496                                                struct ocfs2_xattr_bucket *target,
4497                                                u64 new_blkno,
4498                                                u32 num_clusters,
4499                                                u32 *first_hash)
4500 {
4501         int ret;
4502         struct super_block *sb = inode->i_sb;
4503         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
4504         int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
4505         int to_move = num_buckets / 2;
4506         u64 src_blkno;
4507         u64 last_cluster_blkno = bucket_blkno(first) +
4508                 ((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
4509
4510         BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
4511         BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
4512
4513         trace_ocfs2_mv_xattr_bucket_cross_cluster(
4514                                 (unsigned long long)last_cluster_blkno,
4515                                 (unsigned long long)new_blkno);
4516
4517         ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
4518                                      last_cluster_blkno, new_blkno,
4519                                      to_move, first_hash);
4520         if (ret) {
4521                 mlog_errno(ret);
4522                 goto out;
4523         }
4524
4525         /* This is the first bucket that got moved */
4526         src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
4527
4528         /*
4529          * If the target bucket was part of the moved buckets, we need to
4530          * update first and target.
4531          */
4532         if (bucket_blkno(target) >= src_blkno) {
4533                 /* Find the block for the new target bucket */
4534                 src_blkno = new_blkno +
4535                         (bucket_blkno(target) - src_blkno);
4536
4537                 ocfs2_xattr_bucket_relse(first);
4538                 ocfs2_xattr_bucket_relse(target);
4539
4540                 /*
4541                  * These shouldn't fail - the buffers are in the
4542                  * journal from ocfs2_cp_xattr_bucket().
4543                  */
4544                 ret = ocfs2_read_xattr_bucket(first, new_blkno);
4545                 if (ret) {
4546                         mlog_errno(ret);
4547                         goto out;
4548                 }
4549                 ret = ocfs2_read_xattr_bucket(target, src_blkno);
4550                 if (ret)
4551                         mlog_errno(ret);
4552
4553         }
4554
4555 out:
4556         return ret;
4557 }
4558
4559 /*
4560  * Find the suitable pos when we divide a bucket into 2.
4561  * We have to make sure the xattrs with the same hash value exist
4562  * in the same bucket.
4563  *
4564  * If this ocfs2_xattr_header covers more than one hash value, find a
4565  * place where the hash value changes.  Try to find the most even split.
4566  * The most common case is that all entries have different hash values,
4567  * and the first check we make will find a place to split.
4568  */
4569 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
4570 {
4571         struct ocfs2_xattr_entry *entries = xh->xh_entries;
4572         int count = le16_to_cpu(xh->xh_count);
4573         int delta, middle = count / 2;
4574
4575         /*
4576          * We start at the middle.  Each step gets farther away in both
4577          * directions.  We therefore hit the change in hash value
4578          * nearest to the middle.  Note that this loop does not execute for
4579          * count < 2.
4580          */
4581         for (delta = 0; delta < middle; delta++) {
4582                 /* Let's check delta earlier than middle */
4583                 if (cmp_xe(&entries[middle - delta - 1],
4584                            &entries[middle - delta]))
4585                         return middle - delta;
4586
4587                 /* For even counts, don't walk off the end */
4588                 if ((middle + delta + 1) == count)
4589                         continue;
4590
4591                 /* Now try delta past middle */
4592                 if (cmp_xe(&entries[middle + delta],
4593                            &entries[middle + delta + 1]))
4594                         return middle + delta + 1;
4595         }
4596
4597         /* Every entry had the same hash */
4598         return count;
4599 }
4600
4601 /*
4602  * Move some xattrs in old bucket(blk) to new bucket(new_blk).
4603  * first_hash will record the 1st hash of the new bucket.
4604  *
4605  * Normally half of the xattrs will be moved.  But we have to make
4606  * sure that the xattrs with the same hash value are stored in the
4607  * same bucket. If all the xattrs in this bucket have the same hash
4608  * value, the new bucket will be initialized as an empty one and the
4609  * first_hash will be initialized as (hash_value+1).
4610  */
4611 static int ocfs2_divide_xattr_bucket(struct inode *inode,
4612                                     handle_t *handle,
4613                                     u64 blk,
4614                                     u64 new_blk,
4615                                     u32 *first_hash,
4616                                     int new_bucket_head)
4617 {
4618         int ret, i;
4619         int count, start, len, name_value_len = 0, name_offset = 0;
4620         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4621         struct ocfs2_xattr_header *xh;
4622         struct ocfs2_xattr_entry *xe;
4623         int blocksize = inode->i_sb->s_blocksize;
4624
4625         trace_ocfs2_divide_xattr_bucket_begin((unsigned long long)blk,
4626                                               (unsigned long long)new_blk);
4627
4628         s_bucket = ocfs2_xattr_bucket_new(inode);
4629         t_bucket = ocfs2_xattr_bucket_new(inode);
4630         if (!s_bucket || !t_bucket) {
4631                 ret = -ENOMEM;
4632                 mlog_errno(ret);
4633                 goto out;
4634         }
4635
4636         ret = ocfs2_read_xattr_bucket(s_bucket, blk);
4637         if (ret) {
4638                 mlog_errno(ret);
4639                 goto out;
4640         }
4641
4642         ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
4643                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4644         if (ret) {
4645                 mlog_errno(ret);
4646                 goto out;
4647         }
4648
4649         /*
4650          * Even if !new_bucket_head, we're overwriting t_bucket.  Thus,
4651          * there's no need to read it.
4652          */
4653         ret = ocfs2_init_xattr_bucket(t_bucket, new_blk, new_bucket_head);
4654         if (ret) {
4655                 mlog_errno(ret);
4656                 goto out;
4657         }
4658
4659         /*
4660          * Hey, if we're overwriting t_bucket, what difference does
4661          * ACCESS_CREATE vs ACCESS_WRITE make?  See the comment in the
4662          * same part of ocfs2_cp_xattr_bucket().
4663          */
4664         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4665                                                 new_bucket_head ?
4666                                                 OCFS2_JOURNAL_ACCESS_CREATE :
4667                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4668         if (ret) {
4669                 mlog_errno(ret);
4670                 goto out;
4671         }
4672
4673         xh = bucket_xh(s_bucket);
4674         count = le16_to_cpu(xh->xh_count);
4675         start = ocfs2_xattr_find_divide_pos(xh);
4676
4677         if (start == count) {
4678                 xe = &xh->xh_entries[start-1];
4679
4680                 /*
4681                  * initialized a new empty bucket here.
4682                  * The hash value is set as one larger than
4683                  * that of the last entry in the previous bucket.
4684                  */
4685                 for (i = 0; i < t_bucket->bu_blocks; i++)
4686                         memset(bucket_block(t_bucket, i), 0, blocksize);
4687
4688                 xh = bucket_xh(t_bucket);
4689                 xh->xh_free_start = cpu_to_le16(blocksize);
4690                 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
4691                 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
4692
4693                 goto set_num_buckets;
4694         }
4695
4696         /* copy the whole bucket to the new first. */
4697         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4698
4699         /* update the new bucket. */
4700         xh = bucket_xh(t_bucket);
4701
4702         /*
4703          * Calculate the total name/value len and xh_free_start for
4704          * the old bucket first.
4705          */
4706         name_offset = OCFS2_XATTR_BUCKET_SIZE;
4707         name_value_len = 0;
4708         for (i = 0; i < start; i++) {
4709                 xe = &xh->xh_entries[i];
4710                 name_value_len += namevalue_size_xe(xe);
4711                 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
4712                         name_offset = le16_to_cpu(xe->xe_name_offset);
4713         }
4714
4715         /*
4716          * Now begin the modification to the new bucket.
4717          *
4718          * In the new bucket, We just move the xattr entry to the beginning
4719          * and don't touch the name/value. So there will be some holes in the
4720          * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
4721          * called.
4722          */
4723         xe = &xh->xh_entries[start];
4724         len = sizeof(struct ocfs2_xattr_entry) * (count - start);
4725         trace_ocfs2_divide_xattr_bucket_move(len,
4726                         (int)((char *)xe - (char *)xh),
4727                         (int)((char *)xh->xh_entries - (char *)xh));
4728         memmove((char *)xh->xh_entries, (char *)xe, len);
4729         xe = &xh->xh_entries[count - start];
4730         len = sizeof(struct ocfs2_xattr_entry) * start;
4731         memset((char *)xe, 0, len);
4732
4733         le16_add_cpu(&xh->xh_count, -start);
4734         le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
4735
4736         /* Calculate xh_free_start for the new bucket. */
4737         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4738         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4739                 xe = &xh->xh_entries[i];
4740                 if (le16_to_cpu(xe->xe_name_offset) <
4741                     le16_to_cpu(xh->xh_free_start))
4742                         xh->xh_free_start = xe->xe_name_offset;
4743         }
4744
4745 set_num_buckets:
4746         /* set xh->xh_num_buckets for the new xh. */
4747         if (new_bucket_head)
4748                 xh->xh_num_buckets = cpu_to_le16(1);
4749         else
4750                 xh->xh_num_buckets = 0;
4751
4752         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4753
4754         /* store the first_hash of the new bucket. */
4755         if (first_hash)
4756                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4757
4758         /*
4759          * Now only update the 1st block of the old bucket.  If we
4760          * just added a new empty bucket, there is no need to modify
4761          * it.
4762          */
4763         if (start == count)
4764                 goto out;
4765
4766         xh = bucket_xh(s_bucket);
4767         memset(&xh->xh_entries[start], 0,
4768                sizeof(struct ocfs2_xattr_entry) * (count - start));
4769         xh->xh_count = cpu_to_le16(start);
4770         xh->xh_free_start = cpu_to_le16(name_offset);
4771         xh->xh_name_value_len = cpu_to_le16(name_value_len);
4772
4773         ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
4774
4775 out:
4776         ocfs2_xattr_bucket_free(s_bucket);
4777         ocfs2_xattr_bucket_free(t_bucket);
4778
4779         return ret;
4780 }
4781
4782 /*
4783  * Copy xattr from one bucket to another bucket.
4784  *
4785  * The caller must make sure that the journal transaction
4786  * has enough space for journaling.
4787  */
4788 static int ocfs2_cp_xattr_bucket(struct inode *inode,
4789                                  handle_t *handle,
4790                                  u64 s_blkno,
4791                                  u64 t_blkno,
4792                                  int t_is_new)
4793 {
4794         int ret;
4795         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4796
4797         BUG_ON(s_blkno == t_blkno);
4798
4799         trace_ocfs2_cp_xattr_bucket((unsigned long long)s_blkno,
4800                                     (unsigned long long)t_blkno,
4801                                     t_is_new);
4802
4803         s_bucket = ocfs2_xattr_bucket_new(inode);
4804         t_bucket = ocfs2_xattr_bucket_new(inode);
4805         if (!s_bucket || !t_bucket) {
4806                 ret = -ENOMEM;
4807                 mlog_errno(ret);
4808                 goto out;
4809         }
4810
4811         ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4812         if (ret)
4813                 goto out;
4814
4815         /*
4816          * Even if !t_is_new, we're overwriting t_bucket.  Thus,
4817          * there's no need to read it.
4818          */
4819         ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno, t_is_new);
4820         if (ret)
4821                 goto out;
4822
4823         /*
4824          * Hey, if we're overwriting t_bucket, what difference does
4825          * ACCESS_CREATE vs ACCESS_WRITE make?  Well, if we allocated a new
4826          * cluster to fill, we came here from
4827          * ocfs2_mv_xattr_buckets(), and it is really new -
4828          * ACCESS_CREATE is required.  But we also might have moved data
4829          * out of t_bucket before extending back into it.
4830          * ocfs2_add_new_xattr_bucket() can do this - its call to
4831          * ocfs2_add_new_xattr_cluster() may have created a new extent
4832          * and copied out the end of the old extent.  Then it re-extends
4833          * the old extent back to create space for new xattrs.  That's
4834          * how we get here, and the bucket isn't really new.
4835          */
4836         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4837                                                 t_is_new ?
4838                                                 OCFS2_JOURNAL_ACCESS_CREATE :
4839                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4840         if (ret)
4841                 goto out;
4842
4843         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4844         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4845
4846 out:
4847         ocfs2_xattr_bucket_free(t_bucket);
4848         ocfs2_xattr_bucket_free(s_bucket);
4849
4850         return ret;
4851 }
4852
4853 /*
4854  * src_blk points to the start of an existing extent.  last_blk points to
4855  * last cluster in that extent.  to_blk points to a newly allocated
4856  * extent.  We copy the buckets from the cluster at last_blk to the new
4857  * extent.  If start_bucket is non-zero, we skip that many buckets before
4858  * we start copying.  The new extent's xh_num_buckets gets set to the
4859  * number of buckets we copied.  The old extent's xh_num_buckets shrinks
4860  * by the same amount.
4861  */
4862 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4863                                   u64 src_blk, u64 last_blk, u64 to_blk,
4864                                   unsigned int start_bucket,
4865                                   u32 *first_hash)
4866 {
4867         int i, ret, credits;
4868         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4869         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4870         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4871         struct ocfs2_xattr_bucket *old_first, *new_first;
4872
4873         trace_ocfs2_mv_xattr_buckets((unsigned long long)last_blk,
4874                                      (unsigned long long)to_blk);
4875
4876         BUG_ON(start_bucket >= num_buckets);
4877         if (start_bucket) {
4878                 num_buckets -= start_bucket;
4879                 last_blk += (start_bucket * blks_per_bucket);
4880         }
4881
4882         /* The first bucket of the original extent */
4883         old_first = ocfs2_xattr_bucket_new(inode);
4884         /* The first bucket of the new extent */
4885         new_first = ocfs2_xattr_bucket_new(inode);
4886         if (!old_first || !new_first) {
4887                 ret = -ENOMEM;
4888                 mlog_errno(ret);
4889                 goto out;
4890         }
4891
4892         ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4893         if (ret) {
4894                 mlog_errno(ret);
4895                 goto out;
4896         }
4897
4898         /*
4899          * We need to update the first bucket of the old extent and all
4900          * the buckets going to the new extent.
4901          */
4902         credits = ((num_buckets + 1) * blks_per_bucket);
4903         ret = ocfs2_extend_trans(handle, credits);
4904         if (ret) {
4905                 mlog_errno(ret);
4906                 goto out;
4907         }
4908
4909         ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4910                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4911         if (ret) {
4912                 mlog_errno(ret);
4913                 goto out;
4914         }
4915
4916         for (i = 0; i < num_buckets; i++) {
4917                 ret = ocfs2_cp_xattr_bucket(inode, handle,
4918                                             last_blk + (i * blks_per_bucket),
4919                                             to_blk + (i * blks_per_bucket),
4920                                             1);
4921                 if (ret) {
4922                         mlog_errno(ret);
4923                         goto out;
4924                 }
4925         }
4926
4927         /*
4928          * Get the new bucket ready before we dirty anything
4929          * (This actually shouldn't fail, because we already dirtied
4930          * it once in ocfs2_cp_xattr_bucket()).
4931          */
4932         ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4933         if (ret) {
4934                 mlog_errno(ret);
4935                 goto out;
4936         }
4937         ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4938                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4939         if (ret) {
4940                 mlog_errno(ret);
4941                 goto out;
4942         }
4943
4944         /* Now update the headers */
4945         le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4946         ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4947
4948         bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4949         ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4950
4951         if (first_hash)
4952                 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4953
4954 out:
4955         ocfs2_xattr_bucket_free(new_first);
4956         ocfs2_xattr_bucket_free(old_first);
4957         return ret;
4958 }
4959
4960 /*
4961  * Move some xattrs in this cluster to the new cluster.
4962  * This function should only be called when bucket size == cluster size.
4963  * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4964  */
4965 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4966                                       handle_t *handle,
4967                                       u64 prev_blk,
4968                                       u64 new_blk,
4969                                       u32 *first_hash)
4970 {
4971         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4972         int ret, credits = 2 * blk_per_bucket;
4973
4974         BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4975
4976         ret = ocfs2_extend_trans(handle, credits);
4977         if (ret) {
4978                 mlog_errno(ret);
4979                 return ret;
4980         }
4981
4982         /* Move half of the xattr in start_blk to the next bucket. */
4983         return  ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4984                                           new_blk, first_hash, 1);
4985 }
4986
4987 /*
4988  * Move some xattrs from the old cluster to the new one since they are not
4989  * contiguous in ocfs2 xattr tree.
4990  *
4991  * new_blk starts a new separate cluster, and we will move some xattrs from
4992  * prev_blk to it. v_start will be set as the first name hash value in this
4993  * new cluster so that it can be used as e_cpos during tree insertion and
4994  * don't collide with our original b-tree operations. first_bh and header_bh
4995  * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4996  * to extend the insert bucket.
4997  *
4998  * The problem is how much xattr should we move to the new one and when should
4999  * we update first_bh and header_bh?
5000  * 1. If cluster size > bucket size, that means the previous cluster has more
5001  *    than 1 bucket, so just move half nums of bucket into the new cluster and
5002  *    update the first_bh and header_bh if the insert bucket has been moved
5003  *    to the new cluster.
5004  * 2. If cluster_size == bucket_size:
5005  *    a) If the previous extent rec has more than one cluster and the insert
5006  *       place isn't in the last cluster, copy the entire last cluster to the
5007  *       new one. This time, we don't need to upate the first_bh and header_bh
5008  *       since they will not be moved into the new cluster.
5009  *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
5010  *       the new one. And we set the extend flag to zero if the insert place is
5011  *       moved into the new allocated cluster since no extend is needed.
5012  */
5013 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
5014                                             handle_t *handle,
5015                                             struct ocfs2_xattr_bucket *first,
5016                                             struct ocfs2_xattr_bucket *target,
5017                                             u64 new_blk,
5018                                             u32 prev_clusters,
5019                                             u32 *v_start,
5020                                             int *extend)
5021 {
5022         int ret;
5023
5024         trace_ocfs2_adjust_xattr_cross_cluster(
5025                         (unsigned long long)bucket_blkno(first),
5026                         (unsigned long long)new_blk, prev_clusters);
5027
5028         if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
5029                 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
5030                                                           handle,
5031                                                           first, target,
5032                                                           new_blk,
5033                                                           prev_clusters,
5034                                                           v_start);
5035                 if (ret)
5036                         mlog_errno(ret);
5037         } else {
5038                 /* The start of the last cluster in the first extent */
5039                 u64 last_blk = bucket_blkno(first) +
5040                         ((prev_clusters - 1) *
5041                          ocfs2_clusters_to_blocks(inode->i_sb, 1));
5042
5043                 if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
5044                         ret = ocfs2_mv_xattr_buckets(inode, handle,
5045                                                      bucket_blkno(first),
5046                                                      last_blk, new_blk, 0,
5047                                                      v_start);
5048                         if (ret)
5049                                 mlog_errno(ret);
5050                 } else {
5051                         ret = ocfs2_divide_xattr_cluster(inode, handle,
5052                                                          last_blk, new_blk,
5053                                                          v_start);
5054                         if (ret)
5055                                 mlog_errno(ret);
5056
5057                         if ((bucket_blkno(target) == last_blk) && extend)
5058                                 *extend = 0;
5059                 }
5060         }
5061
5062         return ret;
5063 }
5064
5065 /*
5066  * Add a new cluster for xattr storage.
5067  *
5068  * If the new cluster is contiguous with the previous one, it will be
5069  * appended to the same extent record, and num_clusters will be updated.
5070  * If not, we will insert a new extent for it and move some xattrs in
5071  * the last cluster into the new allocated one.
5072  * We also need to limit the maximum size of a btree leaf, otherwise we'll
5073  * lose the benefits of hashing because we'll have to search large leaves.
5074  * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
5075  * if it's bigger).
5076  *
5077  * first_bh is the first block of the previous extent rec and header_bh
5078  * indicates the bucket we will insert the new xattrs. They will be updated
5079  * when the header_bh is moved into the new cluster.
5080  */
5081 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
5082                                        struct buffer_head *root_bh,
5083                                        struct ocfs2_xattr_bucket *first,
5084                                        struct ocfs2_xattr_bucket *target,
5085                                        u32 *num_clusters,
5086                                        u32 prev_cpos,
5087                                        int *extend,
5088                                        struct ocfs2_xattr_set_ctxt *ctxt)
5089 {
5090         int ret;
5091         u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
5092         u32 prev_clusters = *num_clusters;
5093         u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
5094         u64 block;
5095         handle_t *handle = ctxt->handle;
5096         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5097         struct ocfs2_extent_tree et;
5098
5099         trace_ocfs2_add_new_xattr_cluster_begin(
5100                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
5101                 (unsigned long long)bucket_blkno(first),
5102                 prev_cpos, prev_clusters);
5103
5104         ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5105
5106         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5107                                       OCFS2_JOURNAL_ACCESS_WRITE);
5108         if (ret < 0) {
5109                 mlog_errno(ret);
5110                 goto leave;
5111         }
5112
5113         ret = __ocfs2_claim_clusters(handle, ctxt->data_ac, 1,
5114                                      clusters_to_add, &bit_off, &num_bits);
5115         if (ret < 0) {
5116                 if (ret != -ENOSPC)
5117                         mlog_errno(ret);
5118                 goto leave;
5119         }
5120
5121         BUG_ON(num_bits > clusters_to_add);
5122
5123         block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
5124         trace_ocfs2_add_new_xattr_cluster((unsigned long long)block, num_bits);
5125
5126         if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
5127             (prev_clusters + num_bits) << osb->s_clustersize_bits <=
5128              OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
5129                 /*
5130                  * If this cluster is contiguous with the old one and
5131                  * adding this new cluster, we don't surpass the limit of
5132                  * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
5133                  * initialized and used like other buckets in the previous
5134                  * cluster.
5135                  * So add it as a contiguous one. The caller will handle
5136                  * its init process.
5137                  */
5138                 v_start = prev_cpos + prev_clusters;
5139                 *num_clusters = prev_clusters + num_bits;
5140         } else {
5141                 ret = ocfs2_adjust_xattr_cross_cluster(inode,
5142                                                        handle,
5143                                                        first,
5144                                                        target,
5145                                                        block,
5146                                                        prev_clusters,
5147                                                        &v_start,
5148                                                        extend);
5149                 if (ret) {
5150                         mlog_errno(ret);
5151                         goto leave;
5152                 }
5153         }
5154
5155         trace_ocfs2_add_new_xattr_cluster_insert((unsigned long long)block,
5156                                                  v_start, num_bits);
5157         ret = ocfs2_insert_extent(handle, &et, v_start, block,
5158                                   num_bits, 0, ctxt->meta_ac);
5159         if (ret < 0) {
5160                 mlog_errno(ret);
5161                 goto leave;
5162         }
5163
5164         ocfs2_journal_dirty(handle, root_bh);
5165
5166 leave:
5167         return ret;
5168 }
5169
5170 /*
5171  * We are given an extent.  'first' is the bucket at the very front of
5172  * the extent.  The extent has space for an additional bucket past
5173  * bucket_xh(first)->xh_num_buckets.  'target_blkno' is the block number
5174  * of the target bucket.  We wish to shift every bucket past the target
5175  * down one, filling in that additional space.  When we get back to the
5176  * target, we split the target between itself and the now-empty bucket
5177  * at target+1 (aka, target_blkno + blks_per_bucket).
5178  */
5179 static int ocfs2_extend_xattr_bucket(struct inode *inode,
5180                                      handle_t *handle,
5181                                      struct ocfs2_xattr_bucket *first,
5182                                      u64 target_blk,
5183                                      u32 num_clusters)
5184 {
5185         int ret, credits;
5186         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5187         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5188         u64 end_blk;
5189         u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
5190
5191         trace_ocfs2_extend_xattr_bucket((unsigned long long)target_blk,
5192                                         (unsigned long long)bucket_blkno(first),
5193                                         num_clusters, new_bucket);
5194
5195         /* The extent must have room for an additional bucket */
5196         BUG_ON(new_bucket >=
5197                (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
5198
5199         /* end_blk points to the last existing bucket */
5200         end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
5201
5202         /*
5203          * end_blk is the start of the last existing bucket.
5204          * Thus, (end_blk - target_blk) covers the target bucket and
5205          * every bucket after it up to, but not including, the last
5206          * existing bucket.  Then we add the last existing bucket, the
5207          * new bucket, and the first bucket (3 * blk_per_bucket).
5208          */
5209         credits = (end_blk - target_blk) + (3 * blk_per_bucket);
5210         ret = ocfs2_extend_trans(handle, credits);
5211         if (ret) {
5212                 mlog_errno(ret);
5213                 goto out;
5214         }
5215
5216         ret = ocfs2_xattr_bucket_journal_access(handle, first,
5217                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5218         if (ret) {
5219                 mlog_errno(ret);
5220                 goto out;
5221         }
5222
5223         while (end_blk != target_blk) {
5224                 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
5225                                             end_blk + blk_per_bucket, 0);
5226                 if (ret)
5227                         goto out;
5228                 end_blk -= blk_per_bucket;
5229         }
5230
5231         /* Move half of the xattr in target_blkno to the next bucket. */
5232         ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
5233                                         target_blk + blk_per_bucket, NULL, 0);
5234
5235         le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
5236         ocfs2_xattr_bucket_journal_dirty(handle, first);
5237
5238 out:
5239         return ret;
5240 }
5241
5242 /*
5243  * Add new xattr bucket in an extent record and adjust the buckets
5244  * accordingly.  xb_bh is the ocfs2_xattr_block, and target is the
5245  * bucket we want to insert into.
5246  *
5247  * In the easy case, we will move all the buckets after target down by
5248  * one. Half of target's xattrs will be moved to the next bucket.
5249  *
5250  * If current cluster is full, we'll allocate a new one.  This may not
5251  * be contiguous.  The underlying calls will make sure that there is
5252  * space for the insert, shifting buckets around if necessary.
5253  * 'target' may be moved by those calls.
5254  */
5255 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
5256                                       struct buffer_head *xb_bh,
5257                                       struct ocfs2_xattr_bucket *target,
5258                                       struct ocfs2_xattr_set_ctxt *ctxt)
5259 {
5260         struct ocfs2_xattr_block *xb =
5261                         (struct ocfs2_xattr_block *)xb_bh->b_data;
5262         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
5263         struct ocfs2_extent_list *el = &xb_root->xt_list;
5264         u32 name_hash =
5265                 le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
5266         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5267         int ret, num_buckets, extend = 1;
5268         u64 p_blkno;
5269         u32 e_cpos, num_clusters;
5270         /* The bucket at the front of the extent */
5271         struct ocfs2_xattr_bucket *first;
5272
5273         trace_ocfs2_add_new_xattr_bucket(
5274                                 (unsigned long long)bucket_blkno(target));
5275
5276         /* The first bucket of the original extent */
5277         first = ocfs2_xattr_bucket_new(inode);
5278         if (!first) {
5279                 ret = -ENOMEM;
5280                 mlog_errno(ret);
5281                 goto out;
5282         }
5283
5284         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
5285                                   &num_clusters, el);
5286         if (ret) {
5287                 mlog_errno(ret);
5288                 goto out;
5289         }
5290
5291         ret = ocfs2_read_xattr_bucket(first, p_blkno);
5292         if (ret) {
5293                 mlog_errno(ret);
5294                 goto out;
5295         }
5296
5297         num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
5298         if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
5299                 /*
5300                  * This can move first+target if the target bucket moves
5301                  * to the new extent.
5302                  */
5303                 ret = ocfs2_add_new_xattr_cluster(inode,
5304                                                   xb_bh,
5305                                                   first,
5306                                                   target,
5307                                                   &num_clusters,
5308                                                   e_cpos,
5309                                                   &extend,
5310                                                   ctxt);
5311                 if (ret) {
5312                         mlog_errno(ret);
5313                         goto out;
5314                 }
5315         }
5316
5317         if (extend) {
5318                 ret = ocfs2_extend_xattr_bucket(inode,
5319                                                 ctxt->handle,
5320                                                 first,
5321                                                 bucket_blkno(target),
5322                                                 num_clusters);
5323                 if (ret)
5324                         mlog_errno(ret);
5325         }
5326
5327 out:
5328         ocfs2_xattr_bucket_free(first);
5329
5330         return ret;
5331 }
5332
5333 /*
5334  * Truncate the specified xe_off entry in xattr bucket.
5335  * bucket is indicated by header_bh and len is the new length.
5336  * Both the ocfs2_xattr_value_root and the entry will be updated here.
5337  *
5338  * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
5339  */
5340 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
5341                                              struct ocfs2_xattr_bucket *bucket,
5342                                              int xe_off,
5343                                              int len,
5344                                              struct ocfs2_xattr_set_ctxt *ctxt)
5345 {
5346         int ret, offset;
5347         u64 value_blk;
5348         struct ocfs2_xattr_entry *xe;
5349         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5350         size_t blocksize = inode->i_sb->s_blocksize;
5351         struct ocfs2_xattr_value_buf vb = {
5352                 .vb_access = ocfs2_journal_access,
5353         };
5354
5355         xe = &xh->xh_entries[xe_off];
5356
5357         BUG_ON(!xe || ocfs2_xattr_is_local(xe));
5358
5359         offset = le16_to_cpu(xe->xe_name_offset) +
5360                  OCFS2_XATTR_SIZE(xe->xe_name_len);
5361
5362         value_blk = offset / blocksize;
5363
5364         /* We don't allow ocfs2_xattr_value to be stored in different block. */
5365         BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
5366
5367         vb.vb_bh = bucket->bu_bhs[value_blk];
5368         BUG_ON(!vb.vb_bh);
5369
5370         vb.vb_xv = (struct ocfs2_xattr_value_root *)
5371                 (vb.vb_bh->b_data + offset % blocksize);
5372
5373         /*
5374          * From here on out we have to dirty the bucket.  The generic
5375          * value calls only modify one of the bucket's bhs, but we need
5376          * to send the bucket at once.  So if they error, they *could* have
5377          * modified something.  We have to assume they did, and dirty
5378          * the whole bucket.  This leaves us in a consistent state.
5379          */
5380         trace_ocfs2_xattr_bucket_value_truncate(
5381                         (unsigned long long)bucket_blkno(bucket), xe_off, len);
5382         ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
5383         if (ret) {
5384                 mlog_errno(ret);
5385                 goto out;
5386         }
5387
5388         ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
5389                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5390         if (ret) {
5391                 mlog_errno(ret);
5392                 goto out;
5393         }
5394
5395         xe->xe_value_size = cpu_to_le64(len);
5396
5397         ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
5398
5399 out:
5400         return ret;
5401 }
5402
5403 static int ocfs2_rm_xattr_cluster(struct inode *inode,
5404                                   struct buffer_head *root_bh,
5405                                   u64 blkno,
5406                                   u32 cpos,
5407                                   u32 len,
5408                                   void *para)
5409 {
5410         int ret;
5411         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5412         struct inode *tl_inode = osb->osb_tl_inode;
5413         handle_t *handle;
5414         struct ocfs2_xattr_block *xb =
5415                         (struct ocfs2_xattr_block *)root_bh->b_data;
5416         struct ocfs2_alloc_context *meta_ac = NULL;
5417         struct ocfs2_cached_dealloc_ctxt dealloc;
5418         struct ocfs2_extent_tree et;
5419
5420         ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
5421                                           ocfs2_delete_xattr_in_bucket, para);
5422         if (ret) {
5423                 mlog_errno(ret);
5424                 return ret;
5425         }
5426
5427         ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5428
5429         ocfs2_init_dealloc_ctxt(&dealloc);
5430
5431         trace_ocfs2_rm_xattr_cluster(
5432                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
5433                         (unsigned long long)blkno, cpos, len);
5434
5435         ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
5436                                                len);
5437
5438         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
5439         if (ret) {
5440                 mlog_errno(ret);
5441                 return ret;
5442         }
5443
5444         mutex_lock(&tl_inode->i_mutex);
5445
5446         if (ocfs2_truncate_log_needs_flush(osb)) {
5447                 ret = __ocfs2_flush_truncate_log(osb);
5448                 if (ret < 0) {
5449                         mlog_errno(ret);
5450                         goto out;
5451                 }
5452         }
5453
5454         handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
5455         if (IS_ERR(handle)) {
5456                 ret = -ENOMEM;
5457                 mlog_errno(ret);
5458                 goto out;
5459         }
5460
5461         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5462                                       OCFS2_JOURNAL_ACCESS_WRITE);
5463         if (ret) {
5464                 mlog_errno(ret);
5465                 goto out_commit;
5466         }
5467
5468         ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
5469                                   &dealloc);
5470         if (ret) {
5471                 mlog_errno(ret);
5472                 goto out_commit;
5473         }
5474
5475         le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
5476         ocfs2_journal_dirty(handle, root_bh);
5477
5478         ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
5479         if (ret)
5480                 mlog_errno(ret);
5481         ocfs2_update_inode_fsync_trans(handle, inode, 0);
5482
5483 out_commit:
5484         ocfs2_commit_trans(osb, handle);
5485 out:
5486         ocfs2_schedule_truncate_log_flush(osb, 1);
5487
5488         mutex_unlock(&tl_inode->i_mutex);
5489
5490         if (meta_ac)
5491                 ocfs2_free_alloc_context(meta_ac);
5492
5493         ocfs2_run_deallocs(osb, &dealloc);
5494
5495         return ret;
5496 }
5497
5498 /*
5499  * check whether the xattr bucket is filled up with the same hash value.
5500  * If we want to insert the xattr with the same hash, return -ENOSPC.
5501  * If we want to insert a xattr with different hash value, go ahead
5502  * and ocfs2_divide_xattr_bucket will handle this.
5503  */
5504 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5505                                               struct ocfs2_xattr_bucket *bucket,
5506                                               const char *name)
5507 {
5508         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5509         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5510
5511         if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5512                 return 0;
5513
5514         if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5515             xh->xh_entries[0].xe_name_hash) {
5516                 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5517                      "hash = %u\n",
5518                      (unsigned long long)bucket_blkno(bucket),
5519                      le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5520                 return -ENOSPC;
5521         }
5522
5523         return 0;
5524 }
5525
5526 /*
5527  * Try to set the entry in the current bucket.  If we fail, the caller
5528  * will handle getting us another bucket.
5529  */
5530 static int ocfs2_xattr_set_entry_bucket(struct inode *inode,
5531                                         struct ocfs2_xattr_info *xi,
5532                                         struct ocfs2_xattr_search *xs,
5533                                         struct ocfs2_xattr_set_ctxt *ctxt)
5534 {
5535         int ret;
5536         struct ocfs2_xa_loc loc;
5537
5538         trace_ocfs2_xattr_set_entry_bucket(xi->xi_name);
5539
5540         ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket,
5541                                        xs->not_found ? NULL : xs->here);
5542         ret = ocfs2_xa_set(&loc, xi, ctxt);
5543         if (!ret) {
5544                 xs->here = loc.xl_entry;
5545                 goto out;
5546         }
5547         if (ret != -ENOSPC) {
5548                 mlog_errno(ret);
5549                 goto out;
5550         }
5551
5552         /* Ok, we need space.  Let's try defragmenting the bucket. */
5553         ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5554                                         xs->bucket);
5555         if (ret) {
5556                 mlog_errno(ret);
5557                 goto out;
5558         }
5559
5560         ret = ocfs2_xa_set(&loc, xi, ctxt);
5561         if (!ret) {
5562                 xs->here = loc.xl_entry;
5563                 goto out;
5564         }
5565         if (ret != -ENOSPC)
5566                 mlog_errno(ret);
5567
5568
5569 out:
5570         return ret;
5571 }
5572
5573 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5574                                              struct ocfs2_xattr_info *xi,
5575                                              struct ocfs2_xattr_search *xs,
5576                                              struct ocfs2_xattr_set_ctxt *ctxt)
5577 {
5578         int ret;
5579
5580         trace_ocfs2_xattr_set_entry_index_block(xi->xi_name);
5581
5582         ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5583         if (!ret)
5584                 goto out;
5585         if (ret != -ENOSPC) {
5586                 mlog_errno(ret);
5587                 goto out;
5588         }
5589
5590         /* Ack, need more space.  Let's try to get another bucket! */
5591
5592         /*
5593          * We do not allow for overlapping ranges between buckets. And
5594          * the maximum number of collisions we will allow for then is
5595          * one bucket's worth, so check it here whether we need to
5596          * add a new bucket for the insert.
5597          */
5598         ret = ocfs2_check_xattr_bucket_collision(inode,
5599                                                  xs->bucket,
5600                                                  xi->xi_name);
5601         if (ret) {
5602                 mlog_errno(ret);
5603                 goto out;
5604         }
5605
5606         ret = ocfs2_add_new_xattr_bucket(inode,
5607                                          xs->xattr_bh,
5608                                          xs->bucket,
5609                                          ctxt);
5610         if (ret) {
5611                 mlog_errno(ret);
5612                 goto out;
5613         }
5614
5615         /*
5616          * ocfs2_add_new_xattr_bucket() will have updated
5617          * xs->bucket if it moved, but it will not have updated
5618          * any of the other search fields.  Thus, we drop it and
5619          * re-search.  Everything should be cached, so it'll be
5620          * quick.
5621          */
5622         ocfs2_xattr_bucket_relse(xs->bucket);
5623         ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5624                                            xi->xi_name_index,
5625                                            xi->xi_name, xs);
5626         if (ret && ret != -ENODATA)
5627                 goto out;
5628         xs->not_found = ret;
5629
5630         /* Ok, we have a new bucket, let's try again */
5631         ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5632         if (ret && (ret != -ENOSPC))
5633                 mlog_errno(ret);
5634
5635 out:
5636         return ret;
5637 }
5638
5639 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5640                                         struct ocfs2_xattr_bucket *bucket,
5641                                         void *para)
5642 {
5643         int ret = 0, ref_credits;
5644         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5645         u16 i;
5646         struct ocfs2_xattr_entry *xe;
5647         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5648         struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5649         int credits = ocfs2_remove_extent_credits(osb->sb) +
5650                 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5651         struct ocfs2_xattr_value_root *xv;
5652         struct ocfs2_rm_xattr_bucket_para *args =
5653                         (struct ocfs2_rm_xattr_bucket_para *)para;
5654
5655         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5656
5657         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5658                 xe = &xh->xh_entries[i];
5659                 if (ocfs2_xattr_is_local(xe))
5660                         continue;
5661
5662                 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket,
5663                                                       i, &xv, NULL);
5664                 if (ret) {
5665                         mlog_errno(ret);
5666                         break;
5667                 }
5668
5669                 ret = ocfs2_lock_xattr_remove_allocators(inode, xv,
5670                                                          args->ref_ci,
5671                                                          args->ref_root_bh,
5672                                                          &ctxt.meta_ac,
5673                                                          &ref_credits);
5674
5675                 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
5676                 if (IS_ERR(ctxt.handle)) {
5677                         ret = PTR_ERR(ctxt.handle);
5678                         mlog_errno(ret);
5679                         break;
5680                 }
5681
5682                 ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5683                                                         i, 0, &ctxt);
5684
5685                 ocfs2_commit_trans(osb, ctxt.handle);
5686                 if (ctxt.meta_ac) {
5687                         ocfs2_free_alloc_context(ctxt.meta_ac);
5688                         ctxt.meta_ac = NULL;
5689                 }
5690                 if (ret) {
5691                         mlog_errno(ret);
5692                         break;
5693                 }
5694         }
5695
5696         if (ctxt.meta_ac)
5697                 ocfs2_free_alloc_context(ctxt.meta_ac);
5698         ocfs2_schedule_truncate_log_flush(osb, 1);
5699         ocfs2_run_deallocs(osb, &ctxt.dealloc);
5700         return ret;
5701 }
5702
5703 /*
5704  * Whenever we modify a xattr value root in the bucket(e.g, CoW
5705  * or change the extent record flag), we need to recalculate
5706  * the metaecc for the whole bucket. So it is done here.
5707  *
5708  * Note:
5709  * We have to give the extra credits for the caller.
5710  */
5711 static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
5712                                             handle_t *handle,
5713                                             void *para)
5714 {
5715         int ret;
5716         struct ocfs2_xattr_bucket *bucket =
5717                         (struct ocfs2_xattr_bucket *)para;
5718
5719         ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
5720                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5721         if (ret) {
5722                 mlog_errno(ret);
5723                 return ret;
5724         }
5725
5726         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
5727
5728         return 0;
5729 }
5730
5731 /*
5732  * Special action we need if the xattr value is refcounted.
5733  *
5734  * 1. If the xattr is refcounted, lock the tree.
5735  * 2. CoW the xattr if we are setting the new value and the value
5736  *    will be stored outside.
5737  * 3. In other case, decrease_refcount will work for us, so just
5738  *    lock the refcount tree, calculate the meta and credits is OK.
5739  *
5740  * We have to do CoW before ocfs2_init_xattr_set_ctxt since
5741  * currently CoW is a completed transaction, while this function
5742  * will also lock the allocators and let us deadlock. So we will
5743  * CoW the whole xattr value.
5744  */
5745 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
5746                                         struct ocfs2_dinode *di,
5747                                         struct ocfs2_xattr_info *xi,
5748                                         struct ocfs2_xattr_search *xis,
5749                                         struct ocfs2_xattr_search *xbs,
5750                                         struct ocfs2_refcount_tree **ref_tree,
5751                                         int *meta_add,
5752                                         int *credits)
5753 {
5754         int ret = 0;
5755         struct ocfs2_xattr_block *xb;
5756         struct ocfs2_xattr_entry *xe;
5757         char *base;
5758         u32 p_cluster, num_clusters;
5759         unsigned int ext_flags;
5760         int name_offset, name_len;
5761         struct ocfs2_xattr_value_buf vb;
5762         struct ocfs2_xattr_bucket *bucket = NULL;
5763         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5764         struct ocfs2_post_refcount refcount;
5765         struct ocfs2_post_refcount *p = NULL;
5766         struct buffer_head *ref_root_bh = NULL;
5767
5768         if (!xis->not_found) {
5769                 xe = xis->here;
5770                 name_offset = le16_to_cpu(xe->xe_name_offset);
5771                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5772                 base = xis->base;
5773                 vb.vb_bh = xis->inode_bh;
5774                 vb.vb_access = ocfs2_journal_access_di;
5775         } else {
5776                 int i, block_off = 0;
5777                 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
5778                 xe = xbs->here;
5779                 name_offset = le16_to_cpu(xe->xe_name_offset);
5780                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5781                 i = xbs->here - xbs->header->xh_entries;
5782
5783                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
5784                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
5785                                                         bucket_xh(xbs->bucket),
5786                                                         i, &block_off,
5787                                                         &name_offset);
5788                         if (ret) {
5789                                 mlog_errno(ret);
5790                                 goto out;
5791                         }
5792                         base = bucket_block(xbs->bucket, block_off);
5793                         vb.vb_bh = xbs->bucket->bu_bhs[block_off];
5794                         vb.vb_access = ocfs2_journal_access;
5795
5796                         if (ocfs2_meta_ecc(osb)) {
5797                                 /*create parameters for ocfs2_post_refcount. */
5798                                 bucket = xbs->bucket;
5799                                 refcount.credits = bucket->bu_blocks;
5800                                 refcount.para = bucket;
5801                                 refcount.func =
5802                                         ocfs2_xattr_bucket_post_refcount;
5803                                 p = &refcount;
5804                         }
5805                 } else {
5806                         base = xbs->base;
5807                         vb.vb_bh = xbs->xattr_bh;
5808                         vb.vb_access = ocfs2_journal_access_xb;
5809                 }
5810         }
5811
5812         if (ocfs2_xattr_is_local(xe))
5813                 goto out;
5814
5815         vb.vb_xv = (struct ocfs2_xattr_value_root *)
5816                                 (base + name_offset + name_len);
5817
5818         ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
5819                                        &num_clusters, &vb.vb_xv->xr_list,
5820                                        &ext_flags);
5821         if (ret) {
5822                 mlog_errno(ret);
5823                 goto out;
5824         }
5825
5826         /*
5827          * We just need to check the 1st extent record, since we always
5828          * CoW the whole xattr. So there shouldn't be a xattr with
5829          * some REFCOUNT extent recs after the 1st one.
5830          */
5831         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
5832                 goto out;
5833
5834         ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
5835                                        1, ref_tree, &ref_root_bh);
5836         if (ret) {
5837                 mlog_errno(ret);
5838                 goto out;
5839         }
5840
5841         /*
5842          * If we are deleting the xattr or the new size will be stored inside,
5843          * cool, leave it there, the xattr truncate process will remove them
5844          * for us(it still needs the refcount tree lock and the meta, credits).
5845          * And the worse case is that every cluster truncate will split the
5846          * refcount tree, and make the original extent become 3. So we will need
5847          * 2 * cluster more extent recs at most.
5848          */
5849         if (!xi->xi_value || xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE) {
5850
5851                 ret = ocfs2_refcounted_xattr_delete_need(inode,
5852                                                          &(*ref_tree)->rf_ci,
5853                                                          ref_root_bh, vb.vb_xv,
5854                                                          meta_add, credits);
5855                 if (ret)
5856                         mlog_errno(ret);
5857                 goto out;
5858         }
5859
5860         ret = ocfs2_refcount_cow_xattr(inode, di, &vb,
5861                                        *ref_tree, ref_root_bh, 0,
5862                                        le32_to_cpu(vb.vb_xv->xr_clusters), p);
5863         if (ret)
5864                 mlog_errno(ret);
5865
5866 out:
5867         brelse(ref_root_bh);
5868         return ret;
5869 }
5870
5871 /*
5872  * Add the REFCOUNTED flags for all the extent rec in ocfs2_xattr_value_root.
5873  * The physical clusters will be added to refcount tree.
5874  */
5875 static int ocfs2_xattr_value_attach_refcount(struct inode *inode,
5876                                 struct ocfs2_xattr_value_root *xv,
5877                                 struct ocfs2_extent_tree *value_et,
5878                                 struct ocfs2_caching_info *ref_ci,
5879                                 struct buffer_head *ref_root_bh,
5880                                 struct ocfs2_cached_dealloc_ctxt *dealloc,
5881                                 struct ocfs2_post_refcount *refcount)
5882 {
5883         int ret = 0;
5884         u32 clusters = le32_to_cpu(xv->xr_clusters);
5885         u32 cpos, p_cluster, num_clusters;
5886         struct ocfs2_extent_list *el = &xv->xr_list;
5887         unsigned int ext_flags;
5888
5889         cpos = 0;
5890         while (cpos < clusters) {
5891                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
5892                                                &num_clusters, el, &ext_flags);
5893                 if (ret) {
5894                         mlog_errno(ret);
5895                         break;
5896                 }
5897
5898                 cpos += num_clusters;
5899                 if ((ext_flags & OCFS2_EXT_REFCOUNTED))
5900                         continue;
5901
5902                 BUG_ON(!p_cluster);
5903
5904                 ret = ocfs2_add_refcount_flag(inode, value_et,
5905                                               ref_ci, ref_root_bh,
5906                                               cpos - num_clusters,
5907                                               p_cluster, num_clusters,
5908                                               dealloc, refcount);
5909                 if (ret) {
5910                         mlog_errno(ret);
5911                         break;
5912                 }
5913         }
5914
5915         return ret;
5916 }
5917
5918 /*
5919  * Given a normal ocfs2_xattr_header, refcount all the entries which
5920  * have value stored outside.
5921  * Used for xattrs stored in inode and ocfs2_xattr_block.
5922  */
5923 static int ocfs2_xattr_attach_refcount_normal(struct inode *inode,
5924                                 struct ocfs2_xattr_value_buf *vb,
5925                                 struct ocfs2_xattr_header *header,
5926                                 struct ocfs2_caching_info *ref_ci,
5927                                 struct buffer_head *ref_root_bh,
5928                                 struct ocfs2_cached_dealloc_ctxt *dealloc)
5929 {
5930
5931         struct ocfs2_xattr_entry *xe;
5932         struct ocfs2_xattr_value_root *xv;
5933         struct ocfs2_extent_tree et;
5934         int i, ret = 0;
5935
5936         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
5937                 xe = &header->xh_entries[i];
5938
5939                 if (ocfs2_xattr_is_local(xe))
5940                         continue;
5941
5942                 xv = (struct ocfs2_xattr_value_root *)((void *)header +
5943                         le16_to_cpu(xe->xe_name_offset) +
5944                         OCFS2_XATTR_SIZE(xe->xe_name_len));
5945
5946                 vb->vb_xv = xv;
5947                 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
5948
5949                 ret = ocfs2_xattr_value_attach_refcount(inode, xv, &et,
5950                                                         ref_ci, ref_root_bh,
5951                                                         dealloc, NULL);
5952                 if (ret) {
5953                         mlog_errno(ret);
5954                         break;
5955                 }
5956         }
5957
5958         return ret;
5959 }
5960
5961 static int ocfs2_xattr_inline_attach_refcount(struct inode *inode,
5962                                 struct buffer_head *fe_bh,
5963                                 struct ocfs2_caching_info *ref_ci,
5964                                 struct buffer_head *ref_root_bh,
5965                                 struct ocfs2_cached_dealloc_ctxt *dealloc)
5966 {
5967         struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
5968         struct ocfs2_xattr_header *header = (struct ocfs2_xattr_header *)
5969                                 (fe_bh->b_data + inode->i_sb->s_blocksize -
5970                                 le16_to_cpu(di->i_xattr_inline_size));
5971         struct ocfs2_xattr_value_buf vb = {
5972                 .vb_bh = fe_bh,
5973                 .vb_access = ocfs2_journal_access_di,
5974         };
5975
5976         return ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
5977                                                   ref_ci, ref_root_bh, dealloc);
5978 }
5979
5980 struct ocfs2_xattr_tree_value_refcount_para {
5981         struct ocfs2_caching_info *ref_ci;
5982         struct buffer_head *ref_root_bh;
5983         struct ocfs2_cached_dealloc_ctxt *dealloc;
5984 };
5985
5986 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
5987                                            struct ocfs2_xattr_bucket *bucket,
5988                                            int offset,
5989                                            struct ocfs2_xattr_value_root **xv,
5990                                            struct buffer_head **bh)
5991 {
5992         int ret, block_off, name_offset;
5993         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5994         struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
5995         void *base;
5996
5997         ret = ocfs2_xattr_bucket_get_name_value(sb,
5998                                                 bucket_xh(bucket),
5999                                                 offset,
6000                                                 &block_off,
6001                                                 &name_offset);
6002         if (ret) {
6003                 mlog_errno(ret);
6004                 goto out;
6005         }
6006
6007         base = bucket_block(bucket, block_off);
6008
6009         *xv = (struct ocfs2_xattr_value_root *)(base + name_offset +
6010                          OCFS2_XATTR_SIZE(xe->xe_name_len));
6011
6012         if (bh)
6013                 *bh = bucket->bu_bhs[block_off];
6014 out:
6015         return ret;
6016 }
6017
6018 /*
6019  * For a given xattr bucket, refcount all the entries which
6020  * have value stored outside.
6021  */
6022 static int ocfs2_xattr_bucket_value_refcount(struct inode *inode,
6023                                              struct ocfs2_xattr_bucket *bucket,
6024                                              void *para)
6025 {
6026         int i, ret = 0;
6027         struct ocfs2_extent_tree et;
6028         struct ocfs2_xattr_tree_value_refcount_para *ref =
6029                         (struct ocfs2_xattr_tree_value_refcount_para *)para;
6030         struct ocfs2_xattr_header *xh =
6031                         (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6032         struct ocfs2_xattr_entry *xe;
6033         struct ocfs2_xattr_value_buf vb = {
6034                 .vb_access = ocfs2_journal_access,
6035         };
6036         struct ocfs2_post_refcount refcount = {
6037                 .credits = bucket->bu_blocks,
6038                 .para = bucket,
6039                 .func = ocfs2_xattr_bucket_post_refcount,
6040         };
6041         struct ocfs2_post_refcount *p = NULL;
6042
6043         /* We only need post_refcount if we support metaecc. */
6044         if (ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)))
6045                 p = &refcount;
6046
6047         trace_ocfs2_xattr_bucket_value_refcount(
6048                                 (unsigned long long)bucket_blkno(bucket),
6049                                 le16_to_cpu(xh->xh_count));
6050         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6051                 xe = &xh->xh_entries[i];
6052
6053                 if (ocfs2_xattr_is_local(xe))
6054                         continue;
6055
6056                 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket, i,
6057                                                       &vb.vb_xv, &vb.vb_bh);
6058                 if (ret) {
6059                         mlog_errno(ret);
6060                         break;
6061                 }
6062
6063                 ocfs2_init_xattr_value_extent_tree(&et,
6064                                                    INODE_CACHE(inode), &vb);
6065
6066                 ret = ocfs2_xattr_value_attach_refcount(inode, vb.vb_xv,
6067                                                         &et, ref->ref_ci,
6068                                                         ref->ref_root_bh,
6069                                                         ref->dealloc, p);
6070                 if (ret) {
6071                         mlog_errno(ret);
6072                         break;
6073                 }
6074         }
6075
6076         return ret;
6077
6078 }
6079
6080 static int ocfs2_refcount_xattr_tree_rec(struct inode *inode,
6081                                      struct buffer_head *root_bh,
6082                                      u64 blkno, u32 cpos, u32 len, void *para)
6083 {
6084         return ocfs2_iterate_xattr_buckets(inode, blkno, len,
6085                                            ocfs2_xattr_bucket_value_refcount,
6086                                            para);
6087 }
6088
6089 static int ocfs2_xattr_block_attach_refcount(struct inode *inode,
6090                                 struct buffer_head *blk_bh,
6091                                 struct ocfs2_caching_info *ref_ci,
6092                                 struct buffer_head *ref_root_bh,
6093                                 struct ocfs2_cached_dealloc_ctxt *dealloc)
6094 {
6095         int ret = 0;
6096         struct ocfs2_xattr_block *xb =
6097                                 (struct ocfs2_xattr_block *)blk_bh->b_data;
6098
6099         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
6100                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
6101                 struct ocfs2_xattr_value_buf vb = {
6102                         .vb_bh = blk_bh,
6103                         .vb_access = ocfs2_journal_access_xb,
6104                 };
6105
6106                 ret = ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
6107                                                          ref_ci, ref_root_bh,
6108                                                          dealloc);
6109         } else {
6110                 struct ocfs2_xattr_tree_value_refcount_para para = {
6111                         .ref_ci = ref_ci,
6112                         .ref_root_bh = ref_root_bh,
6113                         .dealloc = dealloc,
6114                 };
6115
6116                 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
6117                                                 ocfs2_refcount_xattr_tree_rec,
6118                                                 &para);
6119         }
6120
6121         return ret;
6122 }
6123
6124 int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
6125                                      struct buffer_head *fe_bh,
6126                                      struct ocfs2_caching_info *ref_ci,
6127                                      struct buffer_head *ref_root_bh,
6128                                      struct ocfs2_cached_dealloc_ctxt *dealloc)
6129 {
6130         int ret = 0;
6131         struct ocfs2_inode_info *oi = OCFS2_I(inode);
6132         struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
6133         struct buffer_head *blk_bh = NULL;
6134
6135         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
6136                 ret = ocfs2_xattr_inline_attach_refcount(inode, fe_bh,
6137                                                          ref_ci, ref_root_bh,
6138                                                          dealloc);
6139                 if (ret) {
6140                         mlog_errno(ret);
6141                         goto out;
6142                 }
6143         }
6144
6145         if (!di->i_xattr_loc)
6146                 goto out;
6147
6148         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
6149                                      &blk_bh);
6150         if (ret < 0) {
6151                 mlog_errno(ret);
6152                 goto out;
6153         }
6154
6155         ret = ocfs2_xattr_block_attach_refcount(inode, blk_bh, ref_ci,
6156                                                 ref_root_bh, dealloc);
6157         if (ret)
6158                 mlog_errno(ret);
6159
6160         brelse(blk_bh);
6161 out:
6162
6163         return ret;
6164 }
6165
6166 typedef int (should_xattr_reflinked)(struct ocfs2_xattr_entry *xe);
6167 /*
6168  * Store the information we need in xattr reflink.
6169  * old_bh and new_bh are inode bh for the old and new inode.
6170  */
6171 struct ocfs2_xattr_reflink {
6172         struct inode *old_inode;
6173         struct inode *new_inode;
6174         struct buffer_head *old_bh;
6175         struct buffer_head *new_bh;
6176         struct ocfs2_caching_info *ref_ci;
6177         struct buffer_head *ref_root_bh;
6178         struct ocfs2_cached_dealloc_ctxt *dealloc;
6179         should_xattr_reflinked *xattr_reflinked;
6180 };
6181
6182 /*
6183  * Given a xattr header and xe offset,
6184  * return the proper xv and the corresponding bh.
6185  * xattr in inode, block and xattr tree have different implementaions.
6186  */
6187 typedef int (get_xattr_value_root)(struct super_block *sb,
6188                                    struct buffer_head *bh,
6189                                    struct ocfs2_xattr_header *xh,
6190                                    int offset,
6191                                    struct ocfs2_xattr_value_root **xv,
6192                                    struct buffer_head **ret_bh,
6193                                    void *para);
6194
6195 /*
6196  * Calculate all the xattr value root metadata stored in this xattr header and
6197  * credits we need if we create them from the scratch.
6198  * We use get_xattr_value_root so that all types of xattr container can use it.
6199  */
6200 static int ocfs2_value_metas_in_xattr_header(struct super_block *sb,
6201                                              struct buffer_head *bh,
6202                                              struct ocfs2_xattr_header *xh,
6203                                              int *metas, int *credits,
6204                                              int *num_recs,
6205                                              get_xattr_value_root *func,
6206                                              void *para)
6207 {
6208         int i, ret = 0;
6209         struct ocfs2_xattr_value_root *xv;
6210         struct ocfs2_xattr_entry *xe;
6211
6212         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6213                 xe = &xh->xh_entries[i];
6214                 if (ocfs2_xattr_is_local(xe))
6215                         continue;
6216
6217                 ret = func(sb, bh, xh, i, &xv, NULL, para);
6218                 if (ret) {
6219                         mlog_errno(ret);
6220                         break;
6221                 }
6222
6223                 *metas += le16_to_cpu(xv->xr_list.l_tree_depth) *
6224                           le16_to_cpu(xv->xr_list.l_next_free_rec);
6225
6226                 *credits += ocfs2_calc_extend_credits(sb,
6227                                                 &def_xv.xv.xr_list);
6228
6229                 /*
6230                  * If the value is a tree with depth > 1, We don't go deep
6231                  * to the extent block, so just calculate a maximum record num.
6232                  */
6233                 if (!xv->xr_list.l_tree_depth)
6234                         *num_recs += le16_to_cpu(xv->xr_list.l_next_free_rec);
6235                 else
6236                         *num_recs += ocfs2_clusters_for_bytes(sb,
6237                                                               XATTR_SIZE_MAX);
6238         }
6239
6240         return ret;
6241 }
6242
6243 /* Used by xattr inode and block to return the right xv and buffer_head. */
6244 static int ocfs2_get_xattr_value_root(struct super_block *sb,
6245                                       struct buffer_head *bh,
6246                                       struct ocfs2_xattr_header *xh,
6247                                       int offset,
6248                                       struct ocfs2_xattr_value_root **xv,
6249                                       struct buffer_head **ret_bh,
6250                                       void *para)
6251 {
6252         struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
6253
6254         *xv = (struct ocfs2_xattr_value_root *)((void *)xh +
6255                 le16_to_cpu(xe->xe_name_offset) +
6256                 OCFS2_XATTR_SIZE(xe->xe_name_len));
6257
6258         if (ret_bh)
6259                 *ret_bh = bh;
6260
6261         return 0;
6262 }
6263
6264 /*
6265  * Lock the meta_ac and caculate how much credits we need for reflink xattrs.
6266  * It is only used for inline xattr and xattr block.
6267  */
6268 static int ocfs2_reflink_lock_xattr_allocators(struct ocfs2_super *osb,
6269                                         struct ocfs2_xattr_header *xh,
6270                                         struct buffer_head *ref_root_bh,
6271                                         int *credits,
6272                                         struct ocfs2_alloc_context **meta_ac)
6273 {
6274         int ret, meta_add = 0, num_recs = 0;
6275         struct ocfs2_refcount_block *rb =
6276                         (struct ocfs2_refcount_block *)ref_root_bh->b_data;
6277
6278         *credits = 0;
6279
6280         ret = ocfs2_value_metas_in_xattr_header(osb->sb, NULL, xh,
6281                                                 &meta_add, credits, &num_recs,
6282                                                 ocfs2_get_xattr_value_root,
6283                                                 NULL);
6284         if (ret) {
6285                 mlog_errno(ret);
6286                 goto out;
6287         }
6288
6289         /*
6290          * We need to add/modify num_recs in refcount tree, so just calculate
6291          * an approximate number we need for refcount tree change.
6292          * Sometimes we need to split the tree, and after split,  half recs
6293          * will be moved to the new block, and a new block can only provide
6294          * half number of recs. So we multiple new blocks by 2.
6295          */
6296         num_recs = num_recs / ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6297         meta_add += num_recs;
6298         *credits += num_recs + num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6299         if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6300                 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6301                             le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6302         else
6303                 *credits += 1;
6304
6305         ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add, meta_ac);
6306         if (ret)
6307                 mlog_errno(ret);
6308
6309 out:
6310         return ret;
6311 }
6312
6313 /*
6314  * Given a xattr header, reflink all the xattrs in this container.
6315  * It can be used for inode, block and bucket.
6316  *
6317  * NOTE:
6318  * Before we call this function, the caller has memcpy the xattr in
6319  * old_xh to the new_xh.
6320  *
6321  * If args.xattr_reflinked is set, call it to decide whether the xe should
6322  * be reflinked or not. If not, remove it from the new xattr header.
6323  */
6324 static int ocfs2_reflink_xattr_header(handle_t *handle,
6325                                       struct ocfs2_xattr_reflink *args,
6326                                       struct buffer_head *old_bh,
6327                                       struct ocfs2_xattr_header *xh,
6328                                       struct buffer_head *new_bh,
6329                                       struct ocfs2_xattr_header *new_xh,
6330                                       struct ocfs2_xattr_value_buf *vb,
6331                                       struct ocfs2_alloc_context *meta_ac,
6332                                       get_xattr_value_root *func,
6333                                       void *para)
6334 {
6335         int ret = 0, i, j;
6336         struct super_block *sb = args->old_inode->i_sb;
6337         struct buffer_head *value_bh;
6338         struct ocfs2_xattr_entry *xe, *last;
6339         struct ocfs2_xattr_value_root *xv, *new_xv;
6340         struct ocfs2_extent_tree data_et;
6341         u32 clusters, cpos, p_cluster, num_clusters;
6342         unsigned int ext_flags = 0;
6343
6344         trace_ocfs2_reflink_xattr_header((unsigned long long)old_bh->b_blocknr,
6345                                          le16_to_cpu(xh->xh_count));
6346
6347         last = &new_xh->xh_entries[le16_to_cpu(new_xh->xh_count)];
6348         for (i = 0, j = 0; i < le16_to_cpu(xh->xh_count); i++, j++) {
6349                 xe = &xh->xh_entries[i];
6350
6351                 if (args->xattr_reflinked && !args->xattr_reflinked(xe)) {
6352                         xe = &new_xh->xh_entries[j];
6353
6354                         le16_add_cpu(&new_xh->xh_count, -1);
6355                         if (new_xh->xh_count) {
6356                                 memmove(xe, xe + 1,
6357                                         (void *)last - (void *)xe);
6358                                 memset(last, 0,
6359                                        sizeof(struct ocfs2_xattr_entry));
6360                         }
6361
6362                         /*
6363                          * We don't want j to increase in the next round since
6364                          * it is already moved ahead.
6365                          */
6366                         j--;
6367                         continue;
6368                 }
6369
6370                 if (ocfs2_xattr_is_local(xe))
6371                         continue;
6372
6373                 ret = func(sb, old_bh, xh, i, &xv, NULL, para);
6374                 if (ret) {
6375                         mlog_errno(ret);
6376                         break;
6377                 }
6378
6379                 ret = func(sb, new_bh, new_xh, j, &new_xv, &value_bh, para);
6380                 if (ret) {
6381                         mlog_errno(ret);
6382                         break;
6383                 }
6384
6385                 /*
6386                  * For the xattr which has l_tree_depth = 0, all the extent
6387                  * recs have already be copied to the new xh with the
6388                  * propriate OCFS2_EXT_REFCOUNTED flag we just need to
6389                  * increase the refount count int the refcount tree.
6390                  *
6391                  * For the xattr which has l_tree_depth > 0, we need
6392                  * to initialize it to the empty default value root,
6393                  * and then insert the extents one by one.
6394                  */
6395                 if (xv->xr_list.l_tree_depth) {
6396                         memcpy(new_xv, &def_xv, sizeof(def_xv));
6397                         vb->vb_xv = new_xv;
6398                         vb->vb_bh = value_bh;
6399                         ocfs2_init_xattr_value_extent_tree(&data_et,
6400                                         INODE_CACHE(args->new_inode), vb);
6401                 }
6402
6403                 clusters = le32_to_cpu(xv->xr_clusters);
6404                 cpos = 0;
6405                 while (cpos < clusters) {
6406                         ret = ocfs2_xattr_get_clusters(args->old_inode,
6407                                                        cpos,
6408                                                        &p_cluster,
6409                                                        &num_clusters,
6410                                                        &xv->xr_list,
6411                                                        &ext_flags);
6412                         if (ret) {
6413                                 mlog_errno(ret);
6414                                 goto out;
6415                         }
6416
6417                         BUG_ON(!p_cluster);
6418
6419                         if (xv->xr_list.l_tree_depth) {
6420                                 ret = ocfs2_insert_extent(handle,
6421                                                 &data_et, cpos,
6422                                                 ocfs2_clusters_to_blocks(
6423                                                         args->old_inode->i_sb,
6424                                                         p_cluster),
6425                                                 num_clusters, ext_flags,
6426                                                 meta_ac);
6427                                 if (ret) {
6428                                         mlog_errno(ret);
6429                                         goto out;
6430                                 }
6431                         }
6432
6433                         ret = ocfs2_increase_refcount(handle, args->ref_ci,
6434                                                       args->ref_root_bh,
6435                                                       p_cluster, num_clusters,
6436                                                       meta_ac, args->dealloc);
6437                         if (ret) {
6438                                 mlog_errno(ret);
6439                                 goto out;
6440                         }
6441
6442                         cpos += num_clusters;
6443                 }
6444         }
6445
6446 out:
6447         return ret;
6448 }
6449
6450 static int ocfs2_reflink_xattr_inline(struct ocfs2_xattr_reflink *args)
6451 {
6452         int ret = 0, credits = 0;
6453         handle_t *handle;
6454         struct ocfs2_super *osb = OCFS2_SB(args->old_inode->i_sb);
6455         struct ocfs2_dinode *di = (struct ocfs2_dinode *)args->old_bh->b_data;
6456         int inline_size = le16_to_cpu(di->i_xattr_inline_size);
6457         int header_off = osb->sb->s_blocksize - inline_size;
6458         struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)
6459                                         (args->old_bh->b_data + header_off);
6460         struct ocfs2_xattr_header *new_xh = (struct ocfs2_xattr_header *)
6461                                         (args->new_bh->b_data + header_off);
6462         struct ocfs2_alloc_context *meta_ac = NULL;
6463         struct ocfs2_inode_info *new_oi;
6464         struct ocfs2_dinode *new_di;
6465         struct ocfs2_xattr_value_buf vb = {
6466                 .vb_bh = args->new_bh,
6467                 .vb_access = ocfs2_journal_access_di,
6468         };
6469
6470         ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6471                                                   &credits, &meta_ac);
6472         if (ret) {
6473                 mlog_errno(ret);
6474                 goto out;
6475         }
6476
6477         handle = ocfs2_start_trans(osb, credits);
6478         if (IS_ERR(handle)) {
6479                 ret = PTR_ERR(handle);
6480                 mlog_errno(ret);
6481                 goto out;
6482         }
6483
6484         ret = ocfs2_journal_access_di(handle, INODE_CACHE(args->new_inode),
6485                                       args->new_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6486         if (ret) {
6487                 mlog_errno(ret);
6488                 goto out_commit;
6489         }
6490
6491         memcpy(args->new_bh->b_data + header_off,
6492                args->old_bh->b_data + header_off, inline_size);
6493
6494         new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6495         new_di->i_xattr_inline_size = cpu_to_le16(inline_size);
6496
6497         ret = ocfs2_reflink_xattr_header(handle, args, args->old_bh, xh,
6498                                          args->new_bh, new_xh, &vb, meta_ac,
6499                                          ocfs2_get_xattr_value_root, NULL);
6500         if (ret) {
6501                 mlog_errno(ret);
6502                 goto out_commit;
6503         }
6504
6505         new_oi = OCFS2_I(args->new_inode);
6506         /*
6507          * Adjust extent record count to reserve space for extended attribute.
6508          * Inline data count had been adjusted in ocfs2_duplicate_inline_data().
6509          */
6510         if (!(new_oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) &&
6511             !(ocfs2_inode_is_fast_symlink(args->new_inode))) {
6512                 struct ocfs2_extent_list *el = &new_di->id2.i_list;
6513                 le16_add_cpu(&el->l_count, -(inline_size /
6514                                         sizeof(struct ocfs2_extent_rec)));
6515         }
6516         spin_lock(&new_oi->ip_lock);
6517         new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL | OCFS2_INLINE_XATTR_FL;
6518         new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6519         spin_unlock(&new_oi->ip_lock);
6520
6521         ocfs2_journal_dirty(handle, args->new_bh);
6522
6523 out_commit:
6524         ocfs2_commit_trans(osb, handle);
6525
6526 out:
6527         if (meta_ac)
6528                 ocfs2_free_alloc_context(meta_ac);
6529         return ret;
6530 }
6531
6532 static int ocfs2_create_empty_xattr_block(struct inode *inode,
6533                                           struct buffer_head *fe_bh,
6534                                           struct buffer_head **ret_bh,
6535                                           int indexed)
6536 {
6537         int ret;
6538         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6539         struct ocfs2_xattr_set_ctxt ctxt;
6540
6541         memset(&ctxt, 0, sizeof(ctxt));
6542         ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &ctxt.meta_ac);
6543         if (ret < 0) {
6544                 mlog_errno(ret);
6545                 return ret;
6546         }
6547
6548         ctxt.handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_CREATE_CREDITS);
6549         if (IS_ERR(ctxt.handle)) {
6550                 ret = PTR_ERR(ctxt.handle);
6551                 mlog_errno(ret);
6552                 goto out;
6553         }
6554
6555         trace_ocfs2_create_empty_xattr_block(
6556                                 (unsigned long long)fe_bh->b_blocknr, indexed);
6557         ret = ocfs2_create_xattr_block(inode, fe_bh, &ctxt, indexed,
6558                                        ret_bh);
6559         if (ret)
6560                 mlog_errno(ret);
6561
6562         ocfs2_commit_trans(osb, ctxt.handle);
6563 out:
6564         ocfs2_free_alloc_context(ctxt.meta_ac);
6565         return ret;
6566 }
6567
6568 static int ocfs2_reflink_xattr_block(struct ocfs2_xattr_reflink *args,
6569                                      struct buffer_head *blk_bh,
6570                                      struct buffer_head *new_blk_bh)
6571 {
6572         int ret = 0, credits = 0;
6573         handle_t *handle;
6574         struct ocfs2_inode_info *new_oi = OCFS2_I(args->new_inode);
6575         struct ocfs2_dinode *new_di;
6576         struct ocfs2_super *osb = OCFS2_SB(args->new_inode->i_sb);
6577         int header_off = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
6578         struct ocfs2_xattr_block *xb =
6579                         (struct ocfs2_xattr_block *)blk_bh->b_data;
6580         struct ocfs2_xattr_header *xh = &xb->xb_attrs.xb_header;
6581         struct ocfs2_xattr_block *new_xb =
6582                         (struct ocfs2_xattr_block *)new_blk_bh->b_data;
6583         struct ocfs2_xattr_header *new_xh = &new_xb->xb_attrs.xb_header;
6584         struct ocfs2_alloc_context *meta_ac;
6585         struct ocfs2_xattr_value_buf vb = {
6586                 .vb_bh = new_blk_bh,
6587                 .vb_access = ocfs2_journal_access_xb,
6588         };
6589
6590         ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6591                                                   &credits, &meta_ac);
6592         if (ret) {
6593                 mlog_errno(ret);
6594                 return ret;
6595         }
6596
6597         /* One more credits in case we need to add xattr flags in new inode. */
6598         handle = ocfs2_start_trans(osb, credits + 1);
6599         if (IS_ERR(handle)) {
6600                 ret = PTR_ERR(handle);
6601                 mlog_errno(ret);
6602                 goto out;
6603         }
6604
6605         if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6606                 ret = ocfs2_journal_access_di(handle,
6607                                               INODE_CACHE(args->new_inode),
6608                                               args->new_bh,
6609                                               OCFS2_JOURNAL_ACCESS_WRITE);
6610                 if (ret) {
6611                         mlog_errno(ret);
6612                         goto out_commit;
6613                 }
6614         }
6615
6616         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(args->new_inode),
6617                                       new_blk_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6618         if (ret) {
6619                 mlog_errno(ret);
6620                 goto out_commit;
6621         }
6622
6623         memcpy(new_blk_bh->b_data + header_off, blk_bh->b_data + header_off,
6624                osb->sb->s_blocksize - header_off);
6625
6626         ret = ocfs2_reflink_xattr_header(handle, args, blk_bh, xh,
6627                                          new_blk_bh, new_xh, &vb, meta_ac,
6628                                          ocfs2_get_xattr_value_root, NULL);
6629         if (ret) {
6630                 mlog_errno(ret);
6631                 goto out_commit;
6632         }
6633
6634         ocfs2_journal_dirty(handle, new_blk_bh);
6635
6636         if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6637                 new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6638                 spin_lock(&new_oi->ip_lock);
6639                 new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
6640                 new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6641                 spin_unlock(&new_oi->ip_lock);
6642
6643                 ocfs2_journal_dirty(handle, args->new_bh);
6644         }
6645
6646 out_commit:
6647         ocfs2_commit_trans(osb, handle);
6648
6649 out:
6650         ocfs2_free_alloc_context(meta_ac);
6651         return ret;
6652 }
6653
6654 struct ocfs2_reflink_xattr_tree_args {
6655         struct ocfs2_xattr_reflink *reflink;
6656         struct buffer_head *old_blk_bh;
6657         struct buffer_head *new_blk_bh;
6658         struct ocfs2_xattr_bucket *old_bucket;
6659         struct ocfs2_xattr_bucket *new_bucket;
6660 };
6661
6662 /*
6663  * NOTE:
6664  * We have to handle the case that both old bucket and new bucket
6665  * will call this function to get the right ret_bh.
6666  * So The caller must give us the right bh.
6667  */
6668 static int ocfs2_get_reflink_xattr_value_root(struct super_block *sb,
6669                                         struct buffer_head *bh,
6670                                         struct ocfs2_xattr_header *xh,
6671                                         int offset,
6672                                         struct ocfs2_xattr_value_root **xv,
6673                                         struct buffer_head **ret_bh,
6674                                         void *para)
6675 {
6676         struct ocfs2_reflink_xattr_tree_args *args =
6677                         (struct ocfs2_reflink_xattr_tree_args *)para;
6678         struct ocfs2_xattr_bucket *bucket;
6679
6680         if (bh == args->old_bucket->bu_bhs[0])
6681                 bucket = args->old_bucket;
6682         else
6683                 bucket = args->new_bucket;
6684
6685         return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6686                                                xv, ret_bh);
6687 }
6688
6689 struct ocfs2_value_tree_metas {
6690         int num_metas;
6691         int credits;
6692         int num_recs;
6693 };
6694
6695 static int ocfs2_value_tree_metas_in_bucket(struct super_block *sb,
6696                                         struct buffer_head *bh,
6697                                         struct ocfs2_xattr_header *xh,
6698                                         int offset,
6699                                         struct ocfs2_xattr_value_root **xv,
6700                                         struct buffer_head **ret_bh,
6701                                         void *para)
6702 {
6703         struct ocfs2_xattr_bucket *bucket =
6704                                 (struct ocfs2_xattr_bucket *)para;
6705
6706         return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6707                                                xv, ret_bh);
6708 }
6709
6710 static int ocfs2_calc_value_tree_metas(struct inode *inode,
6711                                       struct ocfs2_xattr_bucket *bucket,
6712                                       void *para)
6713 {
6714         struct ocfs2_value_tree_metas *metas =
6715                         (struct ocfs2_value_tree_metas *)para;
6716         struct ocfs2_xattr_header *xh =
6717                         (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6718
6719         /* Add the credits for this bucket first. */
6720         metas->credits += bucket->bu_blocks;
6721         return ocfs2_value_metas_in_xattr_header(inode->i_sb, bucket->bu_bhs[0],
6722                                         xh, &metas->num_metas,
6723                                         &metas->credits, &metas->num_recs,
6724                                         ocfs2_value_tree_metas_in_bucket,
6725                                         bucket);
6726 }
6727
6728 /*
6729  * Given a xattr extent rec starting from blkno and having len clusters,
6730  * iterate all the buckets calculate how much metadata we need for reflinking
6731  * all the ocfs2_xattr_value_root and lock the allocators accordingly.
6732  */
6733 static int ocfs2_lock_reflink_xattr_rec_allocators(
6734                                 struct ocfs2_reflink_xattr_tree_args *args,
6735                                 struct ocfs2_extent_tree *xt_et,
6736                                 u64 blkno, u32 len, int *credits,
6737                                 struct ocfs2_alloc_context **meta_ac,
6738                                 struct ocfs2_alloc_context **data_ac)
6739 {
6740         int ret, num_free_extents;
6741         struct ocfs2_value_tree_metas metas;
6742         struct ocfs2_super *osb = OCFS2_SB(args->reflink->old_inode->i_sb);
6743         struct ocfs2_refcount_block *rb;
6744
6745         memset(&metas, 0, sizeof(metas));
6746
6747         ret = ocfs2_iterate_xattr_buckets(args->reflink->old_inode, blkno, len,
6748                                           ocfs2_calc_value_tree_metas, &metas);
6749         if (ret) {
6750                 mlog_errno(ret);
6751                 goto out;
6752         }
6753
6754         *credits = metas.credits;
6755
6756         /*
6757          * Calculate we need for refcount tree change.
6758          *
6759          * We need to add/modify num_recs in refcount tree, so just calculate
6760          * an approximate number we need for refcount tree change.
6761          * Sometimes we need to split the tree, and after split,  half recs
6762          * will be moved to the new block, and a new block can only provide
6763          * half number of recs. So we multiple new blocks by 2.
6764          * In the end, we have to add credits for modifying the already
6765          * existed refcount block.
6766          */
6767         rb = (struct ocfs2_refcount_block *)args->reflink->ref_root_bh->b_data;
6768         metas.num_recs =
6769                 (metas.num_recs + ocfs2_refcount_recs_per_rb(osb->sb) - 1) /
6770                  ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6771         metas.num_metas += metas.num_recs;
6772         *credits += metas.num_recs +
6773                     metas.num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6774         if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6775                 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6776                             le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6777         else
6778                 *credits += 1;
6779
6780         /* count in the xattr tree change. */
6781         num_free_extents = ocfs2_num_free_extents(osb, xt_et);
6782         if (num_free_extents < 0) {
6783                 ret = num_free_extents;
6784                 mlog_errno(ret);
6785                 goto out;
6786         }
6787
6788         if (num_free_extents < len)
6789                 metas.num_metas += ocfs2_extend_meta_needed(xt_et->et_root_el);
6790
6791         *credits += ocfs2_calc_extend_credits(osb->sb,
6792                                               xt_et->et_root_el);
6793
6794         if (metas.num_metas) {
6795                 ret = ocfs2_reserve_new_metadata_blocks(osb, metas.num_metas,
6796                                                         meta_ac);
6797                 if (ret) {
6798                         mlog_errno(ret);
6799                         goto out;
6800                 }
6801         }
6802
6803         if (len) {
6804                 ret = ocfs2_reserve_clusters(osb, len, data_ac);
6805                 if (ret)
6806                         mlog_errno(ret);
6807         }
6808 out:
6809         if (ret) {
6810                 if (*meta_ac) {
6811                         ocfs2_free_alloc_context(*meta_ac);
6812                         *meta_ac = NULL;
6813                 }
6814         }
6815
6816         return ret;
6817 }
6818
6819 static int ocfs2_reflink_xattr_bucket(handle_t *handle,
6820                                 u64 blkno, u64 new_blkno, u32 clusters,
6821                                 u32 *cpos, int num_buckets,
6822                                 struct ocfs2_alloc_context *meta_ac,
6823                                 struct ocfs2_alloc_context *data_ac,
6824                                 struct ocfs2_reflink_xattr_tree_args *args)
6825 {
6826         int i, j, ret = 0;
6827         struct super_block *sb = args->reflink->old_inode->i_sb;
6828         int bpb = args->old_bucket->bu_blocks;
6829         struct ocfs2_xattr_value_buf vb = {
6830                 .vb_access = ocfs2_journal_access,
6831         };
6832
6833         for (i = 0; i < num_buckets; i++, blkno += bpb, new_blkno += bpb) {
6834                 ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6835                 if (ret) {
6836                         mlog_errno(ret);
6837                         break;
6838                 }
6839
6840                 ret = ocfs2_init_xattr_bucket(args->new_bucket, new_blkno, 1);
6841                 if (ret) {
6842                         mlog_errno(ret);
6843                         break;
6844                 }
6845
6846                 ret = ocfs2_xattr_bucket_journal_access(handle,
6847                                                 args->new_bucket,
6848                                                 OCFS2_JOURNAL_ACCESS_CREATE);
6849                 if (ret) {
6850                         mlog_errno(ret);
6851                         break;
6852                 }
6853
6854                 for (j = 0; j < bpb; j++)
6855                         memcpy(bucket_block(args->new_bucket, j),
6856                                bucket_block(args->old_bucket, j),
6857                                sb->s_blocksize);
6858
6859                 /*
6860                  * Record the start cpos so that we can use it to initialize
6861                  * our xattr tree we also set the xh_num_bucket for the new
6862                  * bucket.
6863                  */
6864                 if (i == 0) {
6865                         *cpos = le32_to_cpu(bucket_xh(args->new_bucket)->
6866                                             xh_entries[0].xe_name_hash);
6867                         bucket_xh(args->new_bucket)->xh_num_buckets =
6868                                 cpu_to_le16(num_buckets);
6869                 }
6870
6871                 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6872
6873                 ret = ocfs2_reflink_xattr_header(handle, args->reflink,
6874                                         args->old_bucket->bu_bhs[0],
6875                                         bucket_xh(args->old_bucket),
6876                                         args->new_bucket->bu_bhs[0],
6877                                         bucket_xh(args->new_bucket),
6878                                         &vb, meta_ac,
6879                                         ocfs2_get_reflink_xattr_value_root,
6880                                         args);
6881                 if (ret) {
6882                         mlog_errno(ret);
6883                         break;
6884                 }
6885
6886                 /*
6887                  * Re-access and dirty the bucket to calculate metaecc.
6888                  * Because we may extend the transaction in reflink_xattr_header
6889                  * which will let the already accessed block gone.
6890                  */
6891                 ret = ocfs2_xattr_bucket_journal_access(handle,
6892                                                 args->new_bucket,
6893                                                 OCFS2_JOURNAL_ACCESS_WRITE);
6894                 if (ret) {
6895                         mlog_errno(ret);
6896                         break;
6897                 }
6898
6899                 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6900
6901                 ocfs2_xattr_bucket_relse(args->old_bucket);
6902                 ocfs2_xattr_bucket_relse(args->new_bucket);
6903         }
6904
6905         ocfs2_xattr_bucket_relse(args->old_bucket);
6906         ocfs2_xattr_bucket_relse(args->new_bucket);
6907         return ret;
6908 }
6909
6910 static int ocfs2_reflink_xattr_buckets(handle_t *handle,
6911                                 struct inode *inode,
6912                                 struct ocfs2_reflink_xattr_tree_args *args,
6913                                 struct ocfs2_extent_tree *et,
6914                                 struct ocfs2_alloc_context *meta_ac,
6915                                 struct ocfs2_alloc_context *data_ac,
6916                                 u64 blkno, u32 cpos, u32 len)
6917 {
6918         int ret, first_inserted = 0;
6919         u32 p_cluster, num_clusters, reflink_cpos = 0;
6920         u64 new_blkno;
6921         unsigned int num_buckets, reflink_buckets;
6922         unsigned int bpc =
6923                 ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
6924
6925         ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6926         if (ret) {
6927                 mlog_errno(ret);
6928                 goto out;
6929         }
6930         num_buckets = le16_to_cpu(bucket_xh(args->old_bucket)->xh_num_buckets);
6931         ocfs2_xattr_bucket_relse(args->old_bucket);
6932
6933         while (len && num_buckets) {
6934                 ret = ocfs2_claim_clusters(handle, data_ac,
6935                                            1, &p_cluster, &num_clusters);
6936                 if (ret) {
6937                         mlog_errno(ret);
6938                         goto out;
6939                 }
6940
6941                 new_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
6942                 reflink_buckets = min(num_buckets, bpc * num_clusters);
6943
6944                 ret = ocfs2_reflink_xattr_bucket(handle, blkno,
6945                                                  new_blkno, num_clusters,
6946                                                  &reflink_cpos, reflink_buckets,
6947                                                  meta_ac, data_ac, args);
6948                 if (ret) {
6949                         mlog_errno(ret);
6950                         goto out;
6951                 }
6952
6953                 /*
6954                  * For the 1st allocated cluster, we make it use the same cpos
6955                  * so that the xattr tree looks the same as the original one
6956                  * in the most case.
6957                  */
6958                 if (!first_inserted) {
6959                         reflink_cpos = cpos;
6960                         first_inserted = 1;
6961                 }
6962                 ret = ocfs2_insert_extent(handle, et, reflink_cpos, new_blkno,
6963                                           num_clusters, 0, meta_ac);
6964                 if (ret)
6965                         mlog_errno(ret);
6966
6967                 trace_ocfs2_reflink_xattr_buckets((unsigned long long)new_blkno,
6968                                                   num_clusters, reflink_cpos);
6969
6970                 len -= num_clusters;
6971                 blkno += ocfs2_clusters_to_blocks(inode->i_sb, num_clusters);
6972                 num_buckets -= reflink_buckets;
6973         }
6974 out:
6975         return ret;
6976 }
6977
6978 /*
6979  * Create the same xattr extent record in the new inode's xattr tree.
6980  */
6981 static int ocfs2_reflink_xattr_rec(struct inode *inode,
6982                                    struct buffer_head *root_bh,
6983                                    u64 blkno,
6984                                    u32 cpos,
6985                                    u32 len,
6986                                    void *para)
6987 {
6988         int ret, credits = 0;
6989         handle_t *handle;
6990         struct ocfs2_reflink_xattr_tree_args *args =
6991                         (struct ocfs2_reflink_xattr_tree_args *)para;
6992         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6993         struct ocfs2_alloc_context *meta_ac = NULL;
6994         struct ocfs2_alloc_context *data_ac = NULL;
6995         struct ocfs2_extent_tree et;
6996
6997         trace_ocfs2_reflink_xattr_rec((unsigned long long)blkno, len);
6998
6999         ocfs2_init_xattr_tree_extent_tree(&et,
7000                                           INODE_CACHE(args->reflink->new_inode),
7001                                           args->new_blk_bh);
7002
7003         ret = ocfs2_lock_reflink_xattr_rec_allocators(args, &et, blkno,
7004                                                       len, &credits,
7005                                                       &meta_ac, &data_ac);
7006         if (ret) {
7007                 mlog_errno(ret);
7008                 goto out;
7009         }
7010
7011         handle = ocfs2_start_trans(osb, credits);
7012         if (IS_ERR(handle)) {
7013                 ret = PTR_ERR(handle);
7014                 mlog_errno(ret);
7015                 goto out;
7016         }
7017
7018         ret = ocfs2_reflink_xattr_buckets(handle, inode, args, &et,
7019                                           meta_ac, data_ac,
7020                                           blkno, cpos, len);
7021         if (ret)
7022                 mlog_errno(ret);
7023
7024         ocfs2_commit_trans(osb, handle);
7025
7026 out:
7027         if (meta_ac)
7028                 ocfs2_free_alloc_context(meta_ac);
7029         if (data_ac)
7030                 ocfs2_free_alloc_context(data_ac);
7031         return ret;
7032 }
7033
7034 /*
7035  * Create reflinked xattr buckets.
7036  * We will add bucket one by one, and refcount all the xattrs in the bucket
7037  * if they are stored outside.
7038  */
7039 static int ocfs2_reflink_xattr_tree(struct ocfs2_xattr_reflink *args,
7040                                     struct buffer_head *blk_bh,
7041                                     struct buffer_head *new_blk_bh)
7042 {
7043         int ret;
7044         struct ocfs2_reflink_xattr_tree_args para;
7045
7046         memset(&para, 0, sizeof(para));
7047         para.reflink = args;
7048         para.old_blk_bh = blk_bh;
7049         para.new_blk_bh = new_blk_bh;
7050
7051         para.old_bucket = ocfs2_xattr_bucket_new(args->old_inode);
7052         if (!para.old_bucket) {
7053                 mlog_errno(-ENOMEM);
7054                 return -ENOMEM;
7055         }
7056
7057         para.new_bucket = ocfs2_xattr_bucket_new(args->new_inode);
7058         if (!para.new_bucket) {
7059                 ret = -ENOMEM;
7060                 mlog_errno(ret);
7061                 goto out;
7062         }
7063
7064         ret = ocfs2_iterate_xattr_index_block(args->old_inode, blk_bh,
7065                                               ocfs2_reflink_xattr_rec,
7066                                               &para);
7067         if (ret)
7068                 mlog_errno(ret);
7069
7070 out:
7071         ocfs2_xattr_bucket_free(para.old_bucket);
7072         ocfs2_xattr_bucket_free(para.new_bucket);
7073         return ret;
7074 }
7075
7076 static int ocfs2_reflink_xattr_in_block(struct ocfs2_xattr_reflink *args,
7077                                         struct buffer_head *blk_bh)
7078 {
7079         int ret, indexed = 0;
7080         struct buffer_head *new_blk_bh = NULL;
7081         struct ocfs2_xattr_block *xb =
7082                         (struct ocfs2_xattr_block *)blk_bh->b_data;
7083
7084
7085         if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)
7086                 indexed = 1;
7087
7088         ret = ocfs2_create_empty_xattr_block(args->new_inode, args->new_bh,
7089                                              &new_blk_bh, indexed);
7090         if (ret) {
7091                 mlog_errno(ret);
7092                 goto out;
7093         }
7094
7095         if (!indexed)
7096                 ret = ocfs2_reflink_xattr_block(args, blk_bh, new_blk_bh);
7097         else
7098                 ret = ocfs2_reflink_xattr_tree(args, blk_bh, new_blk_bh);
7099         if (ret)
7100                 mlog_errno(ret);
7101
7102 out:
7103         brelse(new_blk_bh);
7104         return ret;
7105 }
7106
7107 static int ocfs2_reflink_xattr_no_security(struct ocfs2_xattr_entry *xe)
7108 {
7109         int type = ocfs2_xattr_get_type(xe);
7110
7111         return type != OCFS2_XATTR_INDEX_SECURITY &&
7112                type != OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS &&
7113                type != OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
7114 }
7115
7116 int ocfs2_reflink_xattrs(struct inode *old_inode,
7117                          struct buffer_head *old_bh,
7118                          struct inode *new_inode,
7119                          struct buffer_head *new_bh,
7120                          bool preserve_security)
7121 {
7122         int ret;
7123         struct ocfs2_xattr_reflink args;
7124         struct ocfs2_inode_info *oi = OCFS2_I(old_inode);
7125         struct ocfs2_dinode *di = (struct ocfs2_dinode *)old_bh->b_data;
7126         struct buffer_head *blk_bh = NULL;
7127         struct ocfs2_cached_dealloc_ctxt dealloc;
7128         struct ocfs2_refcount_tree *ref_tree;
7129         struct buffer_head *ref_root_bh = NULL;
7130
7131         ret = ocfs2_lock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7132                                        le64_to_cpu(di->i_refcount_loc),
7133                                        1, &ref_tree, &ref_root_bh);
7134         if (ret) {
7135                 mlog_errno(ret);
7136                 goto out;
7137         }
7138
7139         ocfs2_init_dealloc_ctxt(&dealloc);
7140
7141         args.old_inode = old_inode;
7142         args.new_inode = new_inode;
7143         args.old_bh = old_bh;
7144         args.new_bh = new_bh;
7145         args.ref_ci = &ref_tree->rf_ci;
7146         args.ref_root_bh = ref_root_bh;
7147         args.dealloc = &dealloc;
7148         if (preserve_security)
7149                 args.xattr_reflinked = NULL;
7150         else
7151                 args.xattr_reflinked = ocfs2_reflink_xattr_no_security;
7152
7153         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
7154                 ret = ocfs2_reflink_xattr_inline(&args);
7155                 if (ret) {
7156                         mlog_errno(ret);
7157                         goto out_unlock;
7158                 }
7159         }
7160
7161         if (!di->i_xattr_loc)
7162                 goto out_unlock;
7163
7164         ret = ocfs2_read_xattr_block(old_inode, le64_to_cpu(di->i_xattr_loc),
7165                                      &blk_bh);
7166         if (ret < 0) {
7167                 mlog_errno(ret);
7168                 goto out_unlock;
7169         }
7170
7171         ret = ocfs2_reflink_xattr_in_block(&args, blk_bh);
7172         if (ret)
7173                 mlog_errno(ret);
7174
7175         brelse(blk_bh);
7176
7177 out_unlock:
7178         ocfs2_unlock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7179                                    ref_tree, 1);
7180         brelse(ref_root_bh);
7181
7182         if (ocfs2_dealloc_has_cluster(&dealloc)) {
7183                 ocfs2_schedule_truncate_log_flush(OCFS2_SB(old_inode->i_sb), 1);
7184                 ocfs2_run_deallocs(OCFS2_SB(old_inode->i_sb), &dealloc);
7185         }
7186
7187 out:
7188         return ret;
7189 }
7190
7191 /*
7192  * Initialize security and acl for a already created inode.
7193  * Used for reflink a non-preserve-security file.
7194  *
7195  * It uses common api like ocfs2_xattr_set, so the caller
7196  * must not hold any lock expect i_mutex.
7197  */
7198 int ocfs2_init_security_and_acl(struct inode *dir,
7199                                 struct inode *inode,
7200                                 const struct qstr *qstr,
7201                                 struct posix_acl *default_acl,
7202                                 struct posix_acl *acl)
7203 {
7204         struct buffer_head *dir_bh = NULL;
7205         int ret = 0;
7206
7207         ret = ocfs2_init_security_get(inode, dir, qstr, NULL);
7208         if (ret) {
7209                 mlog_errno(ret);
7210                 goto leave;
7211         }
7212
7213         ret = ocfs2_inode_lock(dir, &dir_bh, 0);
7214         if (ret) {
7215                 mlog_errno(ret);
7216                 goto leave;
7217         }
7218
7219         if (!ret && default_acl)
7220                 ret = ocfs2_iop_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
7221         if (!ret && acl)
7222                 ret = ocfs2_iop_set_acl(inode, acl, ACL_TYPE_ACCESS);
7223
7224         ocfs2_inode_unlock(dir, 0);
7225         brelse(dir_bh);
7226 leave:
7227         return ret;
7228 }
7229 /*
7230  * 'security' attributes support
7231  */
7232 static size_t ocfs2_xattr_security_list(const struct xattr_handler *handler,
7233                                         struct dentry *dentry, char *list,
7234                                         size_t list_size, const char *name,
7235                                         size_t name_len)
7236 {
7237         const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
7238         const size_t total_len = prefix_len + name_len + 1;
7239
7240         if (list && total_len <= list_size) {
7241                 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
7242                 memcpy(list + prefix_len, name, name_len);
7243                 list[prefix_len + name_len] = '\0';
7244         }
7245         return total_len;
7246 }
7247
7248 static int ocfs2_xattr_security_get(const struct xattr_handler *handler,
7249                                     struct dentry *dentry, const char *name,
7250                                     void *buffer, size_t size)
7251 {
7252         if (strcmp(name, "") == 0)
7253                 return -EINVAL;
7254         return ocfs2_xattr_get(d_inode(dentry), OCFS2_XATTR_INDEX_SECURITY,
7255                                name, buffer, size);
7256 }
7257
7258 static int ocfs2_xattr_security_set(const struct xattr_handler *handler,
7259                                     struct dentry *dentry, const char *name,
7260                                     const void *value, size_t size, int flags)
7261 {
7262         if (strcmp(name, "") == 0)
7263                 return -EINVAL;
7264
7265         return ocfs2_xattr_set(d_inode(dentry), OCFS2_XATTR_INDEX_SECURITY,
7266                                name, value, size, flags);
7267 }
7268
7269 static int ocfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
7270                      void *fs_info)
7271 {
7272         const struct xattr *xattr;
7273         int err = 0;
7274
7275         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
7276                 err = ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY,
7277                                       xattr->name, xattr->value,
7278                                       xattr->value_len, XATTR_CREATE);
7279                 if (err)
7280                         break;
7281         }
7282         return err;
7283 }
7284
7285 int ocfs2_init_security_get(struct inode *inode,
7286                             struct inode *dir,
7287                             const struct qstr *qstr,
7288                             struct ocfs2_security_xattr_info *si)
7289 {
7290         /* check whether ocfs2 support feature xattr */
7291         if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
7292                 return -EOPNOTSUPP;
7293         if (si)
7294                 return security_old_inode_init_security(inode, dir, qstr,
7295                                                         &si->name, &si->value,
7296                                                         &si->value_len);
7297
7298         return security_inode_init_security(inode, dir, qstr,
7299                                             &ocfs2_initxattrs, NULL);
7300 }
7301
7302 int ocfs2_init_security_set(handle_t *handle,
7303                             struct inode *inode,
7304                             struct buffer_head *di_bh,
7305                             struct ocfs2_security_xattr_info *si,
7306                             struct ocfs2_alloc_context *xattr_ac,
7307                             struct ocfs2_alloc_context *data_ac)
7308 {
7309         return ocfs2_xattr_set_handle(handle, inode, di_bh,
7310                                      OCFS2_XATTR_INDEX_SECURITY,
7311                                      si->name, si->value, si->value_len, 0,
7312                                      xattr_ac, data_ac);
7313 }
7314
7315 const struct xattr_handler ocfs2_xattr_security_handler = {
7316         .prefix = XATTR_SECURITY_PREFIX,
7317         .list   = ocfs2_xattr_security_list,
7318         .get    = ocfs2_xattr_security_get,
7319         .set    = ocfs2_xattr_security_set,
7320 };
7321
7322 /*
7323  * 'trusted' attributes support
7324  */
7325 static size_t ocfs2_xattr_trusted_list(const struct xattr_handler *handler,
7326                                        struct dentry *dentry, char *list,
7327                                        size_t list_size, const char *name,
7328                                        size_t name_len)
7329 {
7330         const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
7331         const size_t total_len = prefix_len + name_len + 1;
7332
7333         if (!capable(CAP_SYS_ADMIN))
7334                 return 0;
7335
7336         if (list && total_len <= list_size) {
7337                 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
7338                 memcpy(list + prefix_len, name, name_len);
7339                 list[prefix_len + name_len] = '\0';
7340         }
7341         return total_len;
7342 }
7343
7344 static int ocfs2_xattr_trusted_get(const struct xattr_handler *handler,
7345                                    struct dentry *dentry, const char *name,
7346                                    void *buffer, size_t size)
7347 {
7348         if (strcmp(name, "") == 0)
7349                 return -EINVAL;
7350         return ocfs2_xattr_get(d_inode(dentry), OCFS2_XATTR_INDEX_TRUSTED,
7351                                name, buffer, size);
7352 }
7353
7354 static int ocfs2_xattr_trusted_set(const struct xattr_handler *handler,
7355                                    struct dentry *dentry, const char *name,
7356                                    const void *value, size_t size, int flags)
7357 {
7358         if (strcmp(name, "") == 0)
7359                 return -EINVAL;
7360
7361         return ocfs2_xattr_set(d_inode(dentry), OCFS2_XATTR_INDEX_TRUSTED,
7362                                name, value, size, flags);
7363 }
7364
7365 const struct xattr_handler ocfs2_xattr_trusted_handler = {
7366         .prefix = XATTR_TRUSTED_PREFIX,
7367         .list   = ocfs2_xattr_trusted_list,
7368         .get    = ocfs2_xattr_trusted_get,
7369         .set    = ocfs2_xattr_trusted_set,
7370 };
7371
7372 /*
7373  * 'user' attributes support
7374  */
7375 static size_t ocfs2_xattr_user_list(const struct xattr_handler *handler,
7376                                     struct dentry *dentry, char *list,
7377                                     size_t list_size, const char *name,
7378                                     size_t name_len)
7379 {
7380         const size_t prefix_len = XATTR_USER_PREFIX_LEN;
7381         const size_t total_len = prefix_len + name_len + 1;
7382         struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7383
7384         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7385                 return 0;
7386
7387         if (list && total_len <= list_size) {
7388                 memcpy(list, XATTR_USER_PREFIX, prefix_len);
7389                 memcpy(list + prefix_len, name, name_len);
7390                 list[prefix_len + name_len] = '\0';
7391         }
7392         return total_len;
7393 }
7394
7395 static int ocfs2_xattr_user_get(const struct xattr_handler *handler,
7396                                 struct dentry *dentry, const char *name,
7397                                 void *buffer, size_t size)
7398 {
7399         struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7400
7401         if (strcmp(name, "") == 0)
7402                 return -EINVAL;
7403         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7404                 return -EOPNOTSUPP;
7405         return ocfs2_xattr_get(d_inode(dentry), OCFS2_XATTR_INDEX_USER, name,
7406                                buffer, size);
7407 }
7408
7409 static int ocfs2_xattr_user_set(const struct xattr_handler *handler,
7410                                 struct dentry *dentry, const char *name,
7411                                 const void *value, size_t size, int flags)
7412 {
7413         struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7414
7415         if (strcmp(name, "") == 0)
7416                 return -EINVAL;
7417         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7418                 return -EOPNOTSUPP;
7419
7420         return ocfs2_xattr_set(d_inode(dentry), OCFS2_XATTR_INDEX_USER,
7421                                name, value, size, flags);
7422 }
7423
7424 const struct xattr_handler ocfs2_xattr_user_handler = {
7425         .prefix = XATTR_USER_PREFIX,
7426         .list   = ocfs2_xattr_user_list,
7427         .get    = ocfs2_xattr_user_get,
7428         .set    = ocfs2_xattr_user_set,
7429 };