fs/ocfs2/namei.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * namei.c
   4  *
   5  * Create and rename file, directory, symlinks
   6  *
   7  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   8  *
   9  *  Portions of this code from linux/fs/ext3/dir.c
  10  *
  11  *  Copyright (C) 1992, 1993, 1994, 1995
  12  *  Remy Card ([email protected])
  13  *  Laboratoire MASI - Institut Blaise pascal
  14  *  Universite Pierre et Marie Curie (Paris VI)
  15  *
  16  *   from
  17  *
  18  *   linux/fs/minix/dir.c
  19  *
  20  *   Copyright (C) 1991, 1992 Linux Torvalds
  21  */
  22
  23 #include <linux/fs.h>
  24 #include <linux/types.h>
  25 #include <linux/slab.h>
  26 #include <linux/highmem.h>
  27 #include <linux/quotaops.h>
  28 #include <linux/iversion.h>
  29
  30 #include <cluster/masklog.h>
  31
  32 #include "ocfs2.h"
  33
  34 #include "alloc.h"
  35 #include "dcache.h"
  36 #include "dir.h"
  37 #include "dlmglue.h"
  38 #include "extent_map.h"
  39 #include "file.h"
  40 #include "inode.h"
  41 #include "journal.h"
  42 #include "namei.h"
  43 #include "suballoc.h"
  44 #include "super.h"
  45 #include "symlink.h"
  46 #include "sysfile.h"
  47 #include "uptodate.h"
  48 #include "xattr.h"
  49 #include "acl.h"
  50 #include "ocfs2_trace.h"
  51 #include "ioctl.h"
  52
  53 #include "buffer_head_io.h"
  54
  55 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
  56                               struct inode *dir,
  57                               struct inode *inode,
  58                               dev_t dev,
  59                               struct buffer_head **new_fe_bh,
  60                               struct buffer_head *parent_fe_bh,
  61                               handle_t *handle,
  62                               struct ocfs2_alloc_context *inode_ac);
  63
  64 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
  65                                     struct inode **ret_orphan_dir,
  66                                     u64 blkno,
  67                                     char *name,
  68                                     struct ocfs2_dir_lookup_result *lookup,
  69                                     bool dio);
  70
  71 static int ocfs2_orphan_add(struct ocfs2_super *osb,
  72                             handle_t *handle,
  73                             struct inode *inode,
  74                             struct buffer_head *fe_bh,
  75                             char *name,
  76                             struct ocfs2_dir_lookup_result *lookup,
  77                             struct inode *orphan_dir_inode,
  78                             bool dio);
  79
  80 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
  81                                      handle_t *handle,
  82                                      struct inode *inode,
  83                                      const char *symname);
  84
  85 static int ocfs2_double_lock(struct ocfs2_super *osb,
  86                              struct buffer_head **bh1,
  87                              struct inode *inode1,
  88                              struct buffer_head **bh2,
  89                              struct inode *inode2,
  90                              int rename);
  91
  92 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2);
  93 /* An orphan dir name is an 8 byte value, printed as a hex string */
  94 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
  95
  96 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
  97                                    unsigned int flags)
  98 {
  99         int status;
 100         u64 blkno;
 101         struct inode *inode = NULL;
 102         struct dentry *ret;
 103         struct ocfs2_inode_info *oi;
 104
 105         trace_ocfs2_lookup(dir, dentry, dentry->d_name.len,
 106                            dentry->d_name.name,
 107                            (unsigned long long)OCFS2_I(dir)->ip_blkno, 0);
 108
 109         if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
 110                 ret = ERR_PTR(-ENAMETOOLONG);
 111                 goto bail;
 112         }
 113
 114         status = ocfs2_inode_lock_nested(dir, NULL, 0, OI_LS_PARENT);
 115         if (status < 0) {
 116                 if (status != -ENOENT)
 117                         mlog_errno(status);
 118                 ret = ERR_PTR(status);
 119                 goto bail;
 120         }
 121
 122         status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name,
 123                                             dentry->d_name.len, &blkno);
 124         if (status < 0)
 125                 goto bail_add;
 126
 127         inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
 128         if (IS_ERR(inode)) {
 129                 ret = ERR_PTR(-EACCES);
 130                 goto bail_unlock;
 131         }
 132
 133         oi = OCFS2_I(inode);
 134         /* Clear any orphaned state... If we were able to look up the
 135          * inode from a directory, it certainly can't be orphaned. We
 136          * might have the bad state from a node which intended to
 137          * orphan this inode but crashed before it could commit the
 138          * unlink. */
 139         spin_lock(&oi->ip_lock);
 140         oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
 141         spin_unlock(&oi->ip_lock);
 142
 143 bail_add:
 144         ret = d_splice_alias(inode, dentry);
 145
 146         if (inode) {
 147                 /*
 148                  * If d_splice_alias() finds a DCACHE_DISCONNECTED
 149                  * dentry, it will d_move() it on top of ourse. The
 150                  * return value will indicate this however, so in
 151                  * those cases, we switch them around for the locking
 152                  * code.
 153                  *
 154                  * NOTE: This dentry already has ->d_op set from
 155                  * ocfs2_get_parent() and ocfs2_get_dentry()
 156                  */
 157                 if (!IS_ERR_OR_NULL(ret))
 158                         dentry = ret;
 159
 160                 status = ocfs2_dentry_attach_lock(dentry, inode,
 161                                                   OCFS2_I(dir)->ip_blkno);
 162                 if (status) {
 163                         mlog_errno(status);
 164                         ret = ERR_PTR(status);
 165                         goto bail_unlock;
 166                 }
 167         } else
 168                 ocfs2_dentry_attach_gen(dentry);
 169
 170 bail_unlock:
 171         /* Don't drop the cluster lock until *after* the d_add --
 172          * unlink on another node will message us to remove that
 173          * dentry under this lock so otherwise we can race this with
 174          * the downconvert thread and have a stale dentry. */
 175         ocfs2_inode_unlock(dir, 0);
 176
 177 bail:
 178
 179         trace_ocfs2_lookup_ret(ret);
 180
 181         return ret;
 182 }
 183
 184 static struct inode *ocfs2_get_init_inode(struct inode *dir, umode_t mode)
 185 {
 186         struct inode *inode;
 187         int status;
 188
 189         inode = new_inode(dir->i_sb);
 190         if (!inode) {
 191                 mlog(ML_ERROR, "new_inode failed!\n");
 192                 return ERR_PTR(-ENOMEM);
 193         }
 194
 195         /* populate as many fields early on as possible - many of
 196          * these are used by the support functions here and in
 197          * callers. */
 198         if (S_ISDIR(mode))
 199                 set_nlink(inode, 2);
 200         mode = mode_strip_sgid(&init_user_ns, dir, mode);
 201         inode_init_owner(&init_user_ns, inode, dir, mode);
 202         status = dquot_initialize(inode);
 203         if (status)
 204                 return ERR_PTR(status);
 205
 206         return inode;
 207 }
 208
 209 static void ocfs2_cleanup_add_entry_failure(struct ocfs2_super *osb,
 210                 struct dentry *dentry, struct inode *inode)
 211 {
 212         struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
 213
 214         ocfs2_simple_drop_lockres(osb, &dl->dl_lockres);
 215         ocfs2_lock_res_free(&dl->dl_lockres);
 216         BUG_ON(dl->dl_count != 1);
 217         spin_lock(&dentry_attach_lock);
 218         dentry->d_fsdata = NULL;
 219         spin_unlock(&dentry_attach_lock);
 220         kfree(dl);
 221         iput(inode);
 222 }
 223
 224 static int ocfs2_mknod(struct user_namespace *mnt_userns,
 225                        struct inode *dir,
 226                        struct dentry *dentry,
 227                        umode_t mode,
 228                        dev_t dev)
 229 {
 230         int status = 0;
 231         struct buffer_head *parent_fe_bh = NULL;
 232         handle_t *handle = NULL;
 233         struct ocfs2_super *osb;
 234         struct ocfs2_dinode *dirfe;
 235         struct ocfs2_dinode *fe = NULL;
 236         struct buffer_head *new_fe_bh = NULL;
 237         struct inode *inode = NULL;
 238         struct ocfs2_alloc_context *inode_ac = NULL;
 239         struct ocfs2_alloc_context *data_ac = NULL;
 240         struct ocfs2_alloc_context *meta_ac = NULL;
 241         int want_clusters = 0;
 242         int want_meta = 0;
 243         int xattr_credits = 0;
 244         struct ocfs2_security_xattr_info si = {
 245                 .enable = 1,
 246         };
 247         int did_quota_inode = 0;
 248         struct ocfs2_dir_lookup_result lookup = { NULL, };
 249         sigset_t oldset;
 250         int did_block_signals = 0;
 251         struct ocfs2_dentry_lock *dl = NULL;
 252
 253         trace_ocfs2_mknod(dir, dentry, dentry->d_name.len, dentry->d_name.name,
 254                           (unsigned long long)OCFS2_I(dir)->ip_blkno,
 255                           (unsigned long)dev, mode);
 256
 257         status = dquot_initialize(dir);
 258         if (status) {
 259                 mlog_errno(status);
 260                 return status;
 261         }
 262
 263         /* get our super block */
 264         osb = OCFS2_SB(dir->i_sb);
 265
 266         status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
 267         if (status < 0) {
 268                 if (status != -ENOENT)
 269                         mlog_errno(status);
 270                 return status;
 271         }
 272
 273         if (S_ISDIR(mode) && (dir->i_nlink >= ocfs2_link_max(osb))) {
 274                 status = -EMLINK;
 275                 goto leave;
 276         }
 277
 278         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
 279         if (!ocfs2_read_links_count(dirfe)) {
 280                 /* can't make a file in a deleted directory. */
 281                 status = -ENOENT;
 282                 goto leave;
 283         }
 284
 285         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 286                                            dentry->d_name.len);
 287         if (status)
 288                 goto leave;
 289
 290         /* get a spot inside the dir. */
 291         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 292                                               dentry->d_name.name,
 293                                               dentry->d_name.len, &lookup);
 294         if (status < 0) {
 295                 mlog_errno(status);
 296                 goto leave;
 297         }
 298
 299         /* reserve an inode spot */
 300         status = ocfs2_reserve_new_inode(osb, &inode_ac);
 301         if (status < 0) {
 302                 if (status != -ENOSPC)
 303                         mlog_errno(status);
 304                 goto leave;
 305         }
 306
 307         inode = ocfs2_get_init_inode(dir, mode);
 308         if (IS_ERR(inode)) {
 309                 status = PTR_ERR(inode);
 310                 inode = NULL;
 311                 mlog_errno(status);
 312                 goto leave;
 313         }
 314
 315         /* get security xattr */
 316         status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
 317         if (status) {
 318                 if (status == -EOPNOTSUPP)
 319                         si.enable = 0;
 320                 else {
 321                         mlog_errno(status);
 322                         goto leave;
 323                 }
 324         }
 325
 326         /* calculate meta data/clusters for setting security and acl xattr */
 327         status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode,
 328                                        &si, &want_clusters,
 329                                        &xattr_credits, &want_meta);
 330         if (status < 0) {
 331                 mlog_errno(status);
 332                 goto leave;
 333         }
 334
 335         /* Reserve a cluster if creating an extent based directory. */
 336         if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
 337                 want_clusters += 1;
 338
 339                 /* Dir indexing requires extra space as well */
 340                 if (ocfs2_supports_indexed_dirs(osb))
 341                         want_meta++;
 342         }
 343
 344         status = ocfs2_reserve_new_metadata_blocks(osb, want_meta, &meta_ac);
 345         if (status < 0) {
 346                 if (status != -ENOSPC)
 347                         mlog_errno(status);
 348                 goto leave;
 349         }
 350
 351         status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
 352         if (status < 0) {
 353                 if (status != -ENOSPC)
 354                         mlog_errno(status);
 355                 goto leave;
 356         }
 357
 358         handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb,
 359                                                             S_ISDIR(mode),
 360                                                             xattr_credits));
 361         if (IS_ERR(handle)) {
 362                 status = PTR_ERR(handle);
 363                 handle = NULL;
 364                 mlog_errno(status);
 365                 goto leave;
 366         }
 367
 368         /* Starting to change things, restart is no longer possible. */
 369         ocfs2_block_signals(&oldset);
 370         did_block_signals = 1;
 371
 372         status = dquot_alloc_inode(inode);
 373         if (status)
 374                 goto leave;
 375         did_quota_inode = 1;
 376
 377         /* do the real work now. */
 378         status = ocfs2_mknod_locked(osb, dir, inode, dev,
 379                                     &new_fe_bh, parent_fe_bh, handle,
 380                                     inode_ac);
 381         if (status < 0) {
 382                 mlog_errno(status);
 383                 goto leave;
 384         }
 385
 386         fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
 387         if (S_ISDIR(mode)) {
 388                 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
 389                                             new_fe_bh, data_ac, meta_ac);
 390                 if (status < 0) {
 391                         mlog_errno(status);
 392                         goto leave;
 393                 }
 394
 395                 status = ocfs2_journal_access_di(handle, INODE_CACHE(dir),
 396                                                  parent_fe_bh,
 397                                                  OCFS2_JOURNAL_ACCESS_WRITE);
 398                 if (status < 0) {
 399                         mlog_errno(status);
 400                         goto leave;
 401                 }
 402                 ocfs2_add_links_count(dirfe, 1);
 403                 ocfs2_journal_dirty(handle, parent_fe_bh);
 404                 inc_nlink(dir);
 405         }
 406
 407         status = ocfs2_init_acl(handle, inode, dir, new_fe_bh, parent_fe_bh,
 408                          meta_ac, data_ac);
 409
 410         if (status < 0) {
 411                 mlog_errno(status);
 412                 goto roll_back;
 413         }
 414
 415         if (si.enable) {
 416                 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
 417                                                  meta_ac, data_ac);
 418                 if (status < 0) {
 419                         mlog_errno(status);
 420                         goto roll_back;
 421                 }
 422         }
 423
 424         /*
 425          * Do this before adding the entry to the directory. We add
 426          * also set d_op after success so that ->d_iput() will cleanup
 427          * the dentry lock even if ocfs2_add_entry() fails below.
 428          */
 429         status = ocfs2_dentry_attach_lock(dentry, inode,
 430                                           OCFS2_I(dir)->ip_blkno);
 431         if (status) {
 432                 mlog_errno(status);
 433                 goto roll_back;
 434         }
 435
 436         dl = dentry->d_fsdata;
 437
 438         status = ocfs2_add_entry(handle, dentry, inode,
 439                                  OCFS2_I(inode)->ip_blkno, parent_fe_bh,
 440                                  &lookup);
 441         if (status < 0) {
 442                 mlog_errno(status);
 443                 goto roll_back;
 444         }
 445
 446         insert_inode_hash(inode);
 447         d_instantiate(dentry, inode);
 448         status = 0;
 449
 450 roll_back:
 451         if (status < 0 && S_ISDIR(mode)) {
 452                 ocfs2_add_links_count(dirfe, -1);
 453                 drop_nlink(dir);
 454         }
 455
 456 leave:
 457         if (status < 0 && did_quota_inode)
 458                 dquot_free_inode(inode);
 459         if (handle) {
 460                 if (status < 0 && fe)
 461                         ocfs2_set_links_count(fe, 0);
 462                 ocfs2_commit_trans(osb, handle);
 463         }
 464
 465         ocfs2_inode_unlock(dir, 1);
 466         if (did_block_signals)
 467                 ocfs2_unblock_signals(&oldset);
 468
 469         brelse(new_fe_bh);
 470         brelse(parent_fe_bh);
 471         kfree(si.value);
 472
 473         ocfs2_free_dir_lookup_result(&lookup);
 474
 475         if (inode_ac)
 476                 ocfs2_free_alloc_context(inode_ac);
 477
 478         if (data_ac)
 479                 ocfs2_free_alloc_context(data_ac);
 480
 481         if (meta_ac)
 482                 ocfs2_free_alloc_context(meta_ac);
 483
 484         /*
 485          * We should call iput after the i_rwsem of the bitmap been
 486          * unlocked in ocfs2_free_alloc_context, or the
 487          * ocfs2_delete_inode will mutex_lock again.
 488          */
 489         if ((status < 0) && inode) {
 490                 if (dl)
 491                         ocfs2_cleanup_add_entry_failure(osb, dentry, inode);
 492
 493                 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
 494                 clear_nlink(inode);
 495                 iput(inode);
 496         }
 497
 498         if (status)
 499                 mlog_errno(status);
 500
 501         return status;
 502 }
 503
 504 static int __ocfs2_mknod_locked(struct inode *dir,
 505                                 struct inode *inode,
 506                                 dev_t dev,
 507                                 struct buffer_head **new_fe_bh,
 508                                 struct buffer_head *parent_fe_bh,
 509                                 handle_t *handle,
 510                                 struct ocfs2_alloc_context *inode_ac,
 511                                 u64 fe_blkno, u64 suballoc_loc, u16 suballoc_bit)
 512 {
 513         int status = 0;
 514         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 515         struct ocfs2_dinode *fe = NULL;
 516         struct ocfs2_extent_list *fel;
 517         u16 feat;
 518         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 519         struct timespec64 ts;
 520
 521         *new_fe_bh = NULL;
 522
 523         /* populate as many fields early on as possible - many of
 524          * these are used by the support functions here and in
 525          * callers. */
 526         inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
 527         oi->ip_blkno = fe_blkno;
 528         spin_lock(&osb->osb_lock);
 529         inode->i_generation = osb->s_next_generation++;
 530         spin_unlock(&osb->osb_lock);
 531
 532         *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
 533         if (!*new_fe_bh) {
 534                 status = -ENOMEM;
 535                 mlog_errno(status);
 536                 goto leave;
 537         }
 538         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), *new_fe_bh);
 539
 540         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
 541                                          *new_fe_bh,
 542                                          OCFS2_JOURNAL_ACCESS_CREATE);
 543         if (status < 0) {
 544                 mlog_errno(status);
 545                 goto leave;
 546         }
 547
 548         fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
 549         memset(fe, 0, osb->sb->s_blocksize);
 550
 551         fe->i_generation = cpu_to_le32(inode->i_generation);
 552         fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
 553         fe->i_blkno = cpu_to_le64(fe_blkno);
 554         fe->i_suballoc_loc = cpu_to_le64(suballoc_loc);
 555         fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
 556         fe->i_suballoc_slot = cpu_to_le16(inode_ac->ac_alloc_slot);
 557         fe->i_uid = cpu_to_le32(i_uid_read(inode));
 558         fe->i_gid = cpu_to_le32(i_gid_read(inode));
 559         fe->i_mode = cpu_to_le16(inode->i_mode);
 560         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 561                 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
 562
 563         ocfs2_set_links_count(fe, inode->i_nlink);
 564
 565         fe->i_last_eb_blk = 0;
 566         strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
 567         fe->i_flags |= cpu_to_le32(OCFS2_VALID_FL);
 568         ktime_get_real_ts64(&ts);
 569         fe->i_atime = fe->i_ctime = fe->i_mtime =
 570                 cpu_to_le64(ts.tv_sec);
 571         fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
 572                 cpu_to_le32(ts.tv_nsec);
 573         fe->i_dtime = 0;
 574
 575         /*
 576          * If supported, directories start with inline data. If inline
 577          * isn't supported, but indexing is, we start them as indexed.
 578          */
 579         feat = le16_to_cpu(fe->i_dyn_features);
 580         if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) {
 581                 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
 582
 583                 fe->id2.i_data.id_count = cpu_to_le16(
 584                                 ocfs2_max_inline_data_with_xattr(osb->sb, fe));
 585         } else {
 586                 fel = &fe->id2.i_list;
 587                 fel->l_tree_depth = 0;
 588                 fel->l_next_free_rec = 0;
 589                 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
 590         }
 591
 592         ocfs2_journal_dirty(handle, *new_fe_bh);
 593
 594         ocfs2_populate_inode(inode, fe, 1);
 595         ocfs2_ci_set_new(osb, INODE_CACHE(inode));
 596         if (!ocfs2_mount_local(osb)) {
 597                 status = ocfs2_create_new_inode_locks(inode);
 598                 if (status < 0)
 599                         mlog_errno(status);
 600         }
 601
 602         ocfs2_update_inode_fsync_trans(handle, inode, 1);
 603
 604 leave:
 605         if (status < 0) {
 606                 if (*new_fe_bh) {
 607                         brelse(*new_fe_bh);
 608                         *new_fe_bh = NULL;
 609                 }
 610         }
 611
 612         if (status)
 613                 mlog_errno(status);
 614         return status;
 615 }
 616
 617 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 618                               struct inode *dir,
 619                               struct inode *inode,
 620                               dev_t dev,
 621                               struct buffer_head **new_fe_bh,
 622                               struct buffer_head *parent_fe_bh,
 623                               handle_t *handle,
 624                               struct ocfs2_alloc_context *inode_ac)
 625 {
 626         int status = 0;
 627         u64 suballoc_loc, fe_blkno = 0;
 628         u16 suballoc_bit;
 629
 630         *new_fe_bh = NULL;
 631
 632         status = ocfs2_claim_new_inode(handle, dir, parent_fe_bh,
 633                                        inode_ac, &suballoc_loc,
 634                                        &suballoc_bit, &fe_blkno);
 635         if (status < 0) {
 636                 mlog_errno(status);
 637                 return status;
 638         }
 639
 640         return __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh,
 641                                     parent_fe_bh, handle, inode_ac,
 642                                     fe_blkno, suballoc_loc, suballoc_bit);
 643 }
 644
 645 static int ocfs2_mkdir(struct user_namespace *mnt_userns,
 646                        struct inode *dir,
 647                        struct dentry *dentry,
 648                        umode_t mode)
 649 {
 650         int ret;
 651
 652         trace_ocfs2_mkdir(dir, dentry, dentry->d_name.len, dentry->d_name.name,
 653                           OCFS2_I(dir)->ip_blkno, mode);
 654         ret = ocfs2_mknod(&init_user_ns, dir, dentry, mode | S_IFDIR, 0);
 655         if (ret)
 656                 mlog_errno(ret);
 657
 658         return ret;
 659 }
 660
 661 static int ocfs2_create(struct user_namespace *mnt_userns,
 662                         struct inode *dir,
 663                         struct dentry *dentry,
 664                         umode_t mode,
 665                         bool excl)
 666 {
 667         int ret;
 668
 669         trace_ocfs2_create(dir, dentry, dentry->d_name.len, dentry->d_name.name,
 670                            (unsigned long long)OCFS2_I(dir)->ip_blkno, mode);
 671         ret = ocfs2_mknod(&init_user_ns, dir, dentry, mode | S_IFREG, 0);
 672         if (ret)
 673                 mlog_errno(ret);
 674
 675         return ret;
 676 }
 677
 678 static int ocfs2_link(struct dentry *old_dentry,
 679                       struct inode *dir,
 680                       struct dentry *dentry)
 681 {
 682         handle_t *handle;
 683         struct inode *inode = d_inode(old_dentry);
 684         struct inode *old_dir = d_inode(old_dentry->d_parent);
 685         int err;
 686         struct buffer_head *fe_bh = NULL;
 687         struct buffer_head *old_dir_bh = NULL;
 688         struct buffer_head *parent_fe_bh = NULL;
 689         struct ocfs2_dinode *fe = NULL;
 690         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 691         struct ocfs2_dir_lookup_result lookup = { NULL, };
 692         sigset_t oldset;
 693         u64 old_de_ino;
 694
 695         trace_ocfs2_link((unsigned long long)OCFS2_I(inode)->ip_blkno,
 696                          old_dentry->d_name.len, old_dentry->d_name.name,
 697                          dentry->d_name.len, dentry->d_name.name);
 698
 699         if (S_ISDIR(inode->i_mode))
 700                 return -EPERM;
 701
 702         err = dquot_initialize(dir);
 703         if (err) {
 704                 mlog_errno(err);
 705                 return err;
 706         }
 707
 708         err = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
 709                         &parent_fe_bh, dir, 0);
 710         if (err < 0) {
 711                 if (err != -ENOENT)
 712                         mlog_errno(err);
 713                 return err;
 714         }
 715
 716         /* make sure both dirs have bhs
 717          * get an extra ref on old_dir_bh if old==new */
 718         if (!parent_fe_bh) {
 719                 if (old_dir_bh) {
 720                         parent_fe_bh = old_dir_bh;
 721                         get_bh(parent_fe_bh);
 722                 } else {
 723                         mlog(ML_ERROR, "%s: no old_dir_bh!\n", osb->uuid_str);
 724                         err = -EIO;
 725                         goto out;
 726                 }
 727         }
 728
 729         if (!dir->i_nlink) {
 730                 err = -ENOENT;
 731                 goto out;
 732         }
 733
 734         err = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
 735                         old_dentry->d_name.len, &old_de_ino);
 736         if (err) {
 737                 err = -ENOENT;
 738                 goto out;
 739         }
 740
 741         /*
 742          * Check whether another node removed the source inode while we
 743          * were in the vfs.
 744          */
 745         if (old_de_ino != OCFS2_I(inode)->ip_blkno) {
 746                 err = -ENOENT;
 747                 goto out;
 748         }
 749
 750         err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 751                                         dentry->d_name.len);
 752         if (err)
 753                 goto out;
 754
 755         err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 756                                            dentry->d_name.name,
 757                                            dentry->d_name.len, &lookup);
 758         if (err < 0) {
 759                 mlog_errno(err);
 760                 goto out;
 761         }
 762
 763         err = ocfs2_inode_lock(inode, &fe_bh, 1);
 764         if (err < 0) {
 765                 if (err != -ENOENT)
 766                         mlog_errno(err);
 767                 goto out;
 768         }
 769
 770         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 771         if (ocfs2_read_links_count(fe) >= ocfs2_link_max(osb)) {
 772                 err = -EMLINK;
 773                 goto out_unlock_inode;
 774         }
 775
 776         handle = ocfs2_start_trans(osb, ocfs2_link_credits(osb->sb));
 777         if (IS_ERR(handle)) {
 778                 err = PTR_ERR(handle);
 779                 handle = NULL;
 780                 mlog_errno(err);
 781                 goto out_unlock_inode;
 782         }
 783
 784         /* Starting to change things, restart is no longer possible. */
 785         ocfs2_block_signals(&oldset);
 786
 787         err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 788                                       OCFS2_JOURNAL_ACCESS_WRITE);
 789         if (err < 0) {
 790                 mlog_errno(err);
 791                 goto out_commit;
 792         }
 793
 794         inc_nlink(inode);
 795         inode->i_ctime = current_time(inode);
 796         ocfs2_set_links_count(fe, inode->i_nlink);
 797         fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 798         fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 799         ocfs2_journal_dirty(handle, fe_bh);
 800
 801         err = ocfs2_add_entry(handle, dentry, inode,
 802                               OCFS2_I(inode)->ip_blkno,
 803                               parent_fe_bh, &lookup);
 804         if (err) {
 805                 ocfs2_add_links_count(fe, -1);
 806                 drop_nlink(inode);
 807                 mlog_errno(err);
 808                 goto out_commit;
 809         }
 810
 811         err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
 812         if (err) {
 813                 mlog_errno(err);
 814                 goto out_commit;
 815         }
 816
 817         ihold(inode);
 818         d_instantiate(dentry, inode);
 819
 820 out_commit:
 821         ocfs2_commit_trans(osb, handle);
 822         ocfs2_unblock_signals(&oldset);
 823 out_unlock_inode:
 824         ocfs2_inode_unlock(inode, 1);
 825
 826 out:
 827         ocfs2_double_unlock(old_dir, dir);
 828
 829         brelse(fe_bh);
 830         brelse(parent_fe_bh);
 831         brelse(old_dir_bh);
 832
 833         ocfs2_free_dir_lookup_result(&lookup);
 834
 835         if (err)
 836                 mlog_errno(err);
 837
 838         return err;
 839 }
 840
 841 /*
 842  * Takes and drops an exclusive lock on the given dentry. This will
 843  * force other nodes to drop it.
 844  */
 845 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
 846 {
 847         int ret;
 848
 849         ret = ocfs2_dentry_lock(dentry, 1);
 850         if (ret)
 851                 mlog_errno(ret);
 852         else
 853                 ocfs2_dentry_unlock(dentry, 1);
 854
 855         return ret;
 856 }
 857
 858 static inline int ocfs2_inode_is_unlinkable(struct inode *inode)
 859 {
 860         if (S_ISDIR(inode->i_mode)) {
 861                 if (inode->i_nlink == 2)
 862                         return 1;
 863                 return 0;
 864         }
 865
 866         if (inode->i_nlink == 1)
 867                 return 1;
 868         return 0;
 869 }
 870
 871 static int ocfs2_unlink(struct inode *dir,
 872                         struct dentry *dentry)
 873 {
 874         int status;
 875         int child_locked = 0;
 876         bool is_unlinkable = false;
 877         struct inode *inode = d_inode(dentry);
 878         struct inode *orphan_dir = NULL;
 879         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 880         u64 blkno;
 881         struct ocfs2_dinode *fe = NULL;
 882         struct buffer_head *fe_bh = NULL;
 883         struct buffer_head *parent_node_bh = NULL;
 884         handle_t *handle = NULL;
 885         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
 886         struct ocfs2_dir_lookup_result lookup = { NULL, };
 887         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
 888
 889         trace_ocfs2_unlink(dir, dentry, dentry->d_name.len,
 890                            dentry->d_name.name,
 891                            (unsigned long long)OCFS2_I(dir)->ip_blkno,
 892                            (unsigned long long)OCFS2_I(inode)->ip_blkno);
 893
 894         status = dquot_initialize(dir);
 895         if (status) {
 896                 mlog_errno(status);
 897                 return status;
 898         }
 899
 900         BUG_ON(d_inode(dentry->d_parent) != dir);
 901
 902         if (inode == osb->root_inode)
 903                 return -EPERM;
 904
 905         status = ocfs2_inode_lock_nested(dir, &parent_node_bh, 1,
 906                                          OI_LS_PARENT);
 907         if (status < 0) {
 908                 if (status != -ENOENT)
 909                         mlog_errno(status);
 910                 return status;
 911         }
 912
 913         status = ocfs2_find_files_on_disk(dentry->d_name.name,
 914                                           dentry->d_name.len, &blkno, dir,
 915                                           &lookup);
 916         if (status < 0) {
 917                 if (status != -ENOENT)
 918                         mlog_errno(status);
 919                 goto leave;
 920         }
 921
 922         if (OCFS2_I(inode)->ip_blkno != blkno) {
 923                 status = -ENOENT;
 924
 925                 trace_ocfs2_unlink_noent(
 926                                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
 927                                 (unsigned long long)blkno,
 928                                 OCFS2_I(inode)->ip_flags);
 929                 goto leave;
 930         }
 931
 932         status = ocfs2_inode_lock(inode, &fe_bh, 1);
 933         if (status < 0) {
 934                 if (status != -ENOENT)
 935                         mlog_errno(status);
 936                 goto leave;
 937         }
 938         child_locked = 1;
 939
 940         if (S_ISDIR(inode->i_mode)) {
 941                 if (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
 942                         status = -ENOTEMPTY;
 943                         goto leave;
 944                 }
 945         }
 946
 947         status = ocfs2_remote_dentry_delete(dentry);
 948         if (status < 0) {
 949                 /* This remote delete should succeed under all normal
 950                  * circumstances. */
 951                 mlog_errno(status);
 952                 goto leave;
 953         }
 954
 955         if (ocfs2_inode_is_unlinkable(inode)) {
 956                 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
 957                                                   OCFS2_I(inode)->ip_blkno,
 958                                                   orphan_name, &orphan_insert,
 959                                                   false);
 960                 if (status < 0) {
 961                         mlog_errno(status);
 962                         goto leave;
 963                 }
 964                 is_unlinkable = true;
 965         }
 966
 967         handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb));
 968         if (IS_ERR(handle)) {
 969                 status = PTR_ERR(handle);
 970                 handle = NULL;
 971                 mlog_errno(status);
 972                 goto leave;
 973         }
 974
 975         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 976                                          OCFS2_JOURNAL_ACCESS_WRITE);
 977         if (status < 0) {
 978                 mlog_errno(status);
 979                 goto leave;
 980         }
 981
 982         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 983
 984         /* delete the name from the parent dir */
 985         status = ocfs2_delete_entry(handle, dir, &lookup);
 986         if (status < 0) {
 987                 mlog_errno(status);
 988                 goto leave;
 989         }
 990
 991         if (S_ISDIR(inode->i_mode))
 992                 drop_nlink(inode);
 993         drop_nlink(inode);
 994         ocfs2_set_links_count(fe, inode->i_nlink);
 995         ocfs2_journal_dirty(handle, fe_bh);
 996
 997         dir->i_ctime = dir->i_mtime = current_time(dir);
 998         if (S_ISDIR(inode->i_mode))
 999                 drop_nlink(dir);
1000
1001         status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
1002         if (status < 0) {
1003                 mlog_errno(status);
1004                 if (S_ISDIR(inode->i_mode))
1005                         inc_nlink(dir);
1006                 goto leave;
1007         }
1008
1009         if (is_unlinkable) {
1010                 status = ocfs2_orphan_add(osb, handle, inode, fe_bh,
1011                                 orphan_name, &orphan_insert, orphan_dir, false);
1012                 if (status < 0)
1013                         mlog_errno(status);
1014         }
1015
1016 leave:
1017         if (handle)
1018                 ocfs2_commit_trans(osb, handle);
1019
1020         if (orphan_dir) {
1021                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1022                 ocfs2_inode_unlock(orphan_dir, 1);
1023                 inode_unlock(orphan_dir);
1024                 iput(orphan_dir);
1025         }
1026
1027         if (child_locked)
1028                 ocfs2_inode_unlock(inode, 1);
1029
1030         ocfs2_inode_unlock(dir, 1);
1031
1032         brelse(fe_bh);
1033         brelse(parent_node_bh);
1034
1035         ocfs2_free_dir_lookup_result(&orphan_insert);
1036         ocfs2_free_dir_lookup_result(&lookup);
1037
1038         if (status && (status != -ENOTEMPTY) && (status != -ENOENT))
1039                 mlog_errno(status);
1040
1041         return status;
1042 }
1043
1044 static int ocfs2_check_if_ancestor(struct ocfs2_super *osb,
1045                 u64 src_inode_no, u64 dest_inode_no)
1046 {
1047         int ret = 0, i = 0;
1048         u64 parent_inode_no = 0;
1049         u64 child_inode_no = src_inode_no;
1050         struct inode *child_inode;
1051
1052 #define MAX_LOOKUP_TIMES 32
1053         while (1) {
1054                 child_inode = ocfs2_iget(osb, child_inode_no, 0, 0);
1055                 if (IS_ERR(child_inode)) {
1056                         ret = PTR_ERR(child_inode);
1057                         break;
1058                 }
1059
1060                 ret = ocfs2_inode_lock(child_inode, NULL, 0);
1061                 if (ret < 0) {
1062                         iput(child_inode);
1063                         if (ret != -ENOENT)
1064                                 mlog_errno(ret);
1065                         break;
1066                 }
1067
1068                 ret = ocfs2_lookup_ino_from_name(child_inode, "..", 2,
1069                                 &parent_inode_no);
1070                 ocfs2_inode_unlock(child_inode, 0);
1071                 iput(child_inode);
1072                 if (ret < 0) {
1073                         ret = -ENOENT;
1074                         break;
1075                 }
1076
1077                 if (parent_inode_no == dest_inode_no) {
1078                         ret = 1;
1079                         break;
1080                 }
1081
1082                 if (parent_inode_no == osb->root_inode->i_ino) {
1083                         ret = 0;
1084                         break;
1085                 }
1086
1087                 child_inode_no = parent_inode_no;
1088
1089                 if (++i >= MAX_LOOKUP_TIMES) {
1090                         mlog_ratelimited(ML_NOTICE, "max lookup times reached, "
1091                                         "filesystem may have nested directories, "
1092                                         "src inode: %llu, dest inode: %llu.\n",
1093                                         (unsigned long long)src_inode_no,
1094                                         (unsigned long long)dest_inode_no);
1095                         ret = 0;
1096                         break;
1097                 }
1098         }
1099
1100         return ret;
1101 }
1102
1103 /*
1104  * The only place this should be used is rename and link!
1105  * if they have the same id, then the 1st one is the only one locked.
1106  */
1107 static int ocfs2_double_lock(struct ocfs2_super *osb,
1108                              struct buffer_head **bh1,
1109                              struct inode *inode1,
1110                              struct buffer_head **bh2,
1111                              struct inode *inode2,
1112                              int rename)
1113 {
1114         int status;
1115         int inode1_is_ancestor, inode2_is_ancestor;
1116         struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
1117         struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
1118
1119         trace_ocfs2_double_lock((unsigned long long)oi1->ip_blkno,
1120                                 (unsigned long long)oi2->ip_blkno);
1121
1122         if (*bh1)
1123                 *bh1 = NULL;
1124         if (*bh2)
1125                 *bh2 = NULL;
1126
1127         /* we always want to lock the one with the lower lockid first.
1128          * and if they are nested, we lock ancestor first */
1129         if (oi1->ip_blkno != oi2->ip_blkno) {
1130                 inode1_is_ancestor = ocfs2_check_if_ancestor(osb, oi2->ip_blkno,
1131                                 oi1->ip_blkno);
1132                 if (inode1_is_ancestor < 0) {
1133                         status = inode1_is_ancestor;
1134                         goto bail;
1135                 }
1136
1137                 inode2_is_ancestor = ocfs2_check_if_ancestor(osb, oi1->ip_blkno,
1138                                 oi2->ip_blkno);
1139                 if (inode2_is_ancestor < 0) {
1140                         status = inode2_is_ancestor;
1141                         goto bail;
1142                 }
1143
1144                 if ((inode1_is_ancestor == 1) ||
1145                                 (oi1->ip_blkno < oi2->ip_blkno &&
1146                                 inode2_is_ancestor == 0)) {
1147                         /* switch id1 and id2 around */
1148                         swap(bh2, bh1);
1149                         swap(inode2, inode1);
1150                 }
1151                 /* lock id2 */
1152                 status = ocfs2_inode_lock_nested(inode2, bh2, 1,
1153                                 rename == 1 ? OI_LS_RENAME1 : OI_LS_PARENT);
1154                 if (status < 0) {
1155                         if (status != -ENOENT)
1156                                 mlog_errno(status);
1157                         goto bail;
1158                 }
1159         }
1160
1161         /* lock id1 */
1162         status = ocfs2_inode_lock_nested(inode1, bh1, 1,
1163                         rename == 1 ?  OI_LS_RENAME2 : OI_LS_PARENT);
1164         if (status < 0) {
1165                 /*
1166                  * An error return must mean that no cluster locks
1167                  * were held on function exit.
1168                  */
1169                 if (oi1->ip_blkno != oi2->ip_blkno) {
1170                         ocfs2_inode_unlock(inode2, 1);
1171                         brelse(*bh2);
1172                         *bh2 = NULL;
1173                 }
1174
1175                 if (status != -ENOENT)
1176                         mlog_errno(status);
1177         }
1178
1179         trace_ocfs2_double_lock_end(
1180                         (unsigned long long)oi1->ip_blkno,
1181                         (unsigned long long)oi2->ip_blkno);
1182
1183 bail:
1184         if (status)
1185                 mlog_errno(status);
1186         return status;
1187 }
1188
1189 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1190 {
1191         ocfs2_inode_unlock(inode1, 1);
1192
1193         if (inode1 != inode2)
1194                 ocfs2_inode_unlock(inode2, 1);
1195 }
1196
1197 static int ocfs2_rename(struct user_namespace *mnt_userns,
1198                         struct inode *old_dir,
1199                         struct dentry *old_dentry,
1200                         struct inode *new_dir,
1201                         struct dentry *new_dentry,
1202                         unsigned int flags)
1203 {
1204         int status = 0, rename_lock = 0, parents_locked = 0, target_exists = 0;
1205         int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 0;
1206         struct inode *old_inode = d_inode(old_dentry);
1207         struct inode *new_inode = d_inode(new_dentry);
1208         struct inode *orphan_dir = NULL;
1209         struct ocfs2_dinode *newfe = NULL;
1210         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1211         struct buffer_head *newfe_bh = NULL;
1212         struct buffer_head *old_inode_bh = NULL;
1213         struct ocfs2_super *osb = NULL;
1214         u64 newfe_blkno, old_de_ino;
1215         handle_t *handle = NULL;
1216         struct buffer_head *old_dir_bh = NULL;
1217         struct buffer_head *new_dir_bh = NULL;
1218         u32 old_dir_nlink = old_dir->i_nlink;
1219         struct ocfs2_dinode *old_di;
1220         struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, };
1221         struct ocfs2_dir_lookup_result target_lookup_res = { NULL, };
1222         struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, };
1223         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
1224         struct ocfs2_dir_lookup_result target_insert = { NULL, };
1225         bool should_add_orphan = false;
1226
1227         if (flags)
1228                 return -EINVAL;
1229
1230         /* At some point it might be nice to break this function up a
1231          * bit. */
1232
1233         trace_ocfs2_rename(old_dir, old_dentry, new_dir, new_dentry,
1234                            old_dentry->d_name.len, old_dentry->d_name.name,
1235                            new_dentry->d_name.len, new_dentry->d_name.name);
1236
1237         status = dquot_initialize(old_dir);
1238         if (status) {
1239                 mlog_errno(status);
1240                 goto bail;
1241         }
1242         status = dquot_initialize(new_dir);
1243         if (status) {
1244                 mlog_errno(status);
1245                 goto bail;
1246         }
1247
1248         osb = OCFS2_SB(old_dir->i_sb);
1249
1250         if (new_inode) {
1251                 if (!igrab(new_inode))
1252                         BUG();
1253         }
1254
1255         /* Assume a directory hierarchy thusly:
1256          * a/b/c
1257          * a/d
1258          * a,b,c, and d are all directories.
1259          *
1260          * from cwd of 'a' on both nodes:
1261          * node1: mv b/c d
1262          * node2: mv d   b/c
1263          *
1264          * And that's why, just like the VFS, we need a file system
1265          * rename lock. */
1266         if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
1267                 status = ocfs2_rename_lock(osb);
1268                 if (status < 0) {
1269                         mlog_errno(status);
1270                         goto bail;
1271                 }
1272                 rename_lock = 1;
1273
1274                 /* here we cannot guarantee the inodes haven't just been
1275                  * changed, so check if they are nested again */
1276                 status = ocfs2_check_if_ancestor(osb, new_dir->i_ino,
1277                                 old_inode->i_ino);
1278                 if (status < 0) {
1279                         mlog_errno(status);
1280                         goto bail;
1281                 } else if (status == 1) {
1282                         status = -EPERM;
1283                         trace_ocfs2_rename_not_permitted(
1284                                         (unsigned long long)old_inode->i_ino,
1285                                         (unsigned long long)new_dir->i_ino);
1286                         goto bail;
1287                 }
1288         }
1289
1290         /* if old and new are the same, this'll just do one lock. */
1291         status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1292                                    &new_dir_bh, new_dir, 1);
1293         if (status < 0) {
1294                 mlog_errno(status);
1295                 goto bail;
1296         }
1297         parents_locked = 1;
1298
1299         if (!new_dir->i_nlink) {
1300                 status = -EACCES;
1301                 goto bail;
1302         }
1303
1304         /* make sure both dirs have bhs
1305          * get an extra ref on old_dir_bh if old==new */
1306         if (!new_dir_bh) {
1307                 if (old_dir_bh) {
1308                         new_dir_bh = old_dir_bh;
1309                         get_bh(new_dir_bh);
1310                 } else {
1311                         mlog(ML_ERROR, "no old_dir_bh!\n");
1312                         status = -EIO;
1313                         goto bail;
1314                 }
1315         }
1316
1317         /*
1318          * Aside from allowing a meta data update, the locking here
1319          * also ensures that the downconvert thread on other nodes
1320          * won't have to concurrently downconvert the inode and the
1321          * dentry locks.
1322          */
1323         status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1,
1324                                          OI_LS_PARENT);
1325         if (status < 0) {
1326                 if (status != -ENOENT)
1327                         mlog_errno(status);
1328                 goto bail;
1329         }
1330         old_child_locked = 1;
1331
1332         status = ocfs2_remote_dentry_delete(old_dentry);
1333         if (status < 0) {
1334                 mlog_errno(status);
1335                 goto bail;
1336         }
1337
1338         if (S_ISDIR(old_inode->i_mode)) {
1339                 u64 old_inode_parent;
1340
1341                 update_dot_dot = 1;
1342                 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1343                                                   old_inode,
1344                                                   &old_inode_dot_dot_res);
1345                 if (status) {
1346                         status = -EIO;
1347                         goto bail;
1348                 }
1349
1350                 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1351                         status = -EIO;
1352                         goto bail;
1353                 }
1354
1355                 if (!new_inode && new_dir != old_dir &&
1356                     new_dir->i_nlink >= ocfs2_link_max(osb)) {
1357                         status = -EMLINK;
1358                         goto bail;
1359                 }
1360         }
1361
1362         status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1363                                             old_dentry->d_name.len,
1364                                             &old_de_ino);
1365         if (status) {
1366                 status = -ENOENT;
1367                 goto bail;
1368         }
1369
1370         /*
1371          *  Check for inode number is _not_ due to possible IO errors.
1372          *  We might rmdir the source, keep it as pwd of some process
1373          *  and merrily kill the link to whatever was created under the
1374          *  same name. Goodbye sticky bit ;-<
1375          */
1376         if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1377                 status = -ENOENT;
1378                 goto bail;
1379         }
1380
1381         /* check if the target already exists (in which case we need
1382          * to delete it */
1383         status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1384                                           new_dentry->d_name.len,
1385                                           &newfe_blkno, new_dir,
1386                                           &target_lookup_res);
1387         /* The only error we allow here is -ENOENT because the new
1388          * file not existing is perfectly valid. */
1389         if ((status < 0) && (status != -ENOENT)) {
1390                 /* If we cannot find the file specified we should just */
1391                 /* return the error... */
1392                 mlog_errno(status);
1393                 goto bail;
1394         }
1395         if (status == 0)
1396                 target_exists = 1;
1397
1398         if (!target_exists && new_inode) {
1399                 /*
1400                  * Target was unlinked by another node while we were
1401                  * waiting to get to ocfs2_rename(). There isn't
1402                  * anything we can do here to help the situation, so
1403                  * bubble up the appropriate error.
1404                  */
1405                 status = -ENOENT;
1406                 goto bail;
1407         }
1408
1409         /* In case we need to overwrite an existing file, we blow it
1410          * away first */
1411         if (target_exists) {
1412                 /* VFS didn't think there existed an inode here, but
1413                  * someone else in the cluster must have raced our
1414                  * rename to create one. Today we error cleanly, in
1415                  * the future we should consider calling iget to build
1416                  * a new struct inode for this entry. */
1417                 if (!new_inode) {
1418                         status = -EACCES;
1419
1420                         trace_ocfs2_rename_target_exists(new_dentry->d_name.len,
1421                                                 new_dentry->d_name.name);
1422                         goto bail;
1423                 }
1424
1425                 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1426                         status = -EACCES;
1427
1428                         trace_ocfs2_rename_disagree(
1429                              (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1430                              (unsigned long long)newfe_blkno,
1431                              OCFS2_I(new_inode)->ip_flags);
1432                         goto bail;
1433                 }
1434
1435                 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1);
1436                 if (status < 0) {
1437                         if (status != -ENOENT)
1438                                 mlog_errno(status);
1439                         goto bail;
1440                 }
1441                 new_child_locked = 1;
1442
1443                 status = ocfs2_remote_dentry_delete(new_dentry);
1444                 if (status < 0) {
1445                         mlog_errno(status);
1446                         goto bail;
1447                 }
1448
1449                 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1450
1451                 trace_ocfs2_rename_over_existing(
1452                      (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1453                      (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1454
1455                 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1456                         status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1457                                                 OCFS2_I(new_inode)->ip_blkno,
1458                                                 orphan_name, &orphan_insert,
1459                                                 false);
1460                         if (status < 0) {
1461                                 mlog_errno(status);
1462                                 goto bail;
1463                         }
1464                         should_add_orphan = true;
1465                 }
1466         } else {
1467                 BUG_ON(d_inode(new_dentry->d_parent) != new_dir);
1468
1469                 status = ocfs2_check_dir_for_entry(new_dir,
1470                                                    new_dentry->d_name.name,
1471                                                    new_dentry->d_name.len);
1472                 if (status)
1473                         goto bail;
1474
1475                 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1476                                                       new_dentry->d_name.name,
1477                                                       new_dentry->d_name.len,
1478                                                       &target_insert);
1479                 if (status < 0) {
1480                         mlog_errno(status);
1481                         goto bail;
1482                 }
1483         }
1484
1485         handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
1486         if (IS_ERR(handle)) {
1487                 status = PTR_ERR(handle);
1488                 handle = NULL;
1489                 mlog_errno(status);
1490                 goto bail;
1491         }
1492
1493         if (target_exists) {
1494                 if (S_ISDIR(new_inode->i_mode)) {
1495                         if (new_inode->i_nlink != 2 ||
1496                             !ocfs2_empty_dir(new_inode)) {
1497                                 status = -ENOTEMPTY;
1498                                 goto bail;
1499                         }
1500                 }
1501                 status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
1502                                                  newfe_bh,
1503                                                  OCFS2_JOURNAL_ACCESS_WRITE);
1504                 if (status < 0) {
1505                         mlog_errno(status);
1506                         goto bail;
1507                 }
1508
1509                 /* change the dirent to point to the correct inode */
1510                 status = ocfs2_update_entry(new_dir, handle, &target_lookup_res,
1511                                             old_inode);
1512                 if (status < 0) {
1513                         mlog_errno(status);
1514                         goto bail;
1515                 }
1516                 inode_inc_iversion(new_dir);
1517
1518                 if (S_ISDIR(new_inode->i_mode))
1519                         ocfs2_set_links_count(newfe, 0);
1520                 else
1521                         ocfs2_add_links_count(newfe, -1);
1522                 ocfs2_journal_dirty(handle, newfe_bh);
1523                 if (should_add_orphan) {
1524                         status = ocfs2_orphan_add(osb, handle, new_inode,
1525                                         newfe_bh, orphan_name,
1526                                         &orphan_insert, orphan_dir, false);
1527                         if (status < 0) {
1528                                 mlog_errno(status);
1529                                 goto bail;
1530                         }
1531                 }
1532         } else {
1533                 /* if the name was not found in new_dir, add it now */
1534                 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1535                                          OCFS2_I(old_inode)->ip_blkno,
1536                                          new_dir_bh, &target_insert);
1537         }
1538
1539         old_inode->i_ctime = current_time(old_inode);
1540         mark_inode_dirty(old_inode);
1541
1542         status = ocfs2_journal_access_di(handle, INODE_CACHE(old_inode),
1543                                          old_inode_bh,
1544                                          OCFS2_JOURNAL_ACCESS_WRITE);
1545         if (status >= 0) {
1546                 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1547
1548                 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1549                 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1550                 ocfs2_journal_dirty(handle, old_inode_bh);
1551         } else
1552                 mlog_errno(status);
1553
1554         /*
1555          * Now that the name has been added to new_dir, remove the old name.
1556          *
1557          * We don't keep any directory entry context around until now
1558          * because the insert might have changed the type of directory
1559          * we're dealing with.
1560          */
1561         status = ocfs2_find_entry(old_dentry->d_name.name,
1562                                   old_dentry->d_name.len, old_dir,
1563                                   &old_entry_lookup);
1564         if (status) {
1565                 if (!is_journal_aborted(osb->journal->j_journal)) {
1566                         ocfs2_error(osb->sb, "new entry %.*s is added, but old entry %.*s "
1567                                         "is not deleted.",
1568                                         new_dentry->d_name.len, new_dentry->d_name.name,
1569                                         old_dentry->d_name.len, old_dentry->d_name.name);
1570                 }
1571                 goto bail;
1572         }
1573
1574         status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
1575         if (status < 0) {
1576                 mlog_errno(status);
1577                 if (!is_journal_aborted(osb->journal->j_journal)) {
1578                         ocfs2_error(osb->sb, "new entry %.*s is added, but old entry %.*s "
1579                                         "is not deleted.",
1580                                         new_dentry->d_name.len, new_dentry->d_name.name,
1581                                         old_dentry->d_name.len, old_dentry->d_name.name);
1582                 }
1583                 goto bail;
1584         }
1585
1586         if (new_inode) {
1587                 drop_nlink(new_inode);
1588                 new_inode->i_ctime = current_time(new_inode);
1589         }
1590         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1591
1592         if (update_dot_dot) {
1593                 status = ocfs2_update_entry(old_inode, handle,
1594                                             &old_inode_dot_dot_res, new_dir);
1595                 drop_nlink(old_dir);
1596                 if (new_inode) {
1597                         drop_nlink(new_inode);
1598                 } else {
1599                         inc_nlink(new_dir);
1600                         mark_inode_dirty(new_dir);
1601                 }
1602         }
1603         mark_inode_dirty(old_dir);
1604         ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1605         if (new_inode) {
1606                 mark_inode_dirty(new_inode);
1607                 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1608         }
1609
1610         if (old_dir != new_dir) {
1611                 /* Keep the same times on both directories.*/
1612                 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1613
1614                 /*
1615                  * This will also pick up the i_nlink change from the
1616                  * block above.
1617                  */
1618                 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1619         }
1620
1621         if (old_dir_nlink != old_dir->i_nlink) {
1622                 if (!old_dir_bh) {
1623                         mlog(ML_ERROR, "need to change nlink for old dir "
1624                              "%llu from %d to %d but bh is NULL!\n",
1625                              (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1626                              (int)old_dir_nlink, old_dir->i_nlink);
1627                 } else {
1628                         struct ocfs2_dinode *fe;
1629                         status = ocfs2_journal_access_di(handle,
1630                                                          INODE_CACHE(old_dir),
1631                                                          old_dir_bh,
1632                                                          OCFS2_JOURNAL_ACCESS_WRITE);
1633                         fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1634                         ocfs2_set_links_count(fe, old_dir->i_nlink);
1635                         ocfs2_journal_dirty(handle, old_dir_bh);
1636                 }
1637         }
1638         ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1639         status = 0;
1640 bail:
1641         if (handle)
1642                 ocfs2_commit_trans(osb, handle);
1643
1644         if (orphan_dir) {
1645                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1646                 ocfs2_inode_unlock(orphan_dir, 1);
1647                 inode_unlock(orphan_dir);
1648                 iput(orphan_dir);
1649         }
1650
1651         if (new_child_locked)
1652                 ocfs2_inode_unlock(new_inode, 1);
1653
1654         if (old_child_locked)
1655                 ocfs2_inode_unlock(old_inode, 1);
1656
1657         if (parents_locked)
1658                 ocfs2_double_unlock(old_dir, new_dir);
1659
1660         if (rename_lock)
1661                 ocfs2_rename_unlock(osb);
1662
1663         if (new_inode)
1664                 sync_mapping_buffers(old_inode->i_mapping);
1665
1666         iput(new_inode);
1667
1668         ocfs2_free_dir_lookup_result(&target_lookup_res);
1669         ocfs2_free_dir_lookup_result(&old_entry_lookup);
1670         ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res);
1671         ocfs2_free_dir_lookup_result(&orphan_insert);
1672         ocfs2_free_dir_lookup_result(&target_insert);
1673
1674         brelse(newfe_bh);
1675         brelse(old_inode_bh);
1676         brelse(old_dir_bh);
1677         brelse(new_dir_bh);
1678
1679         if (status)
1680                 mlog_errno(status);
1681
1682         return status;
1683 }
1684
1685 /*
1686  * we expect i_size = strlen(symname). Copy symname into the file
1687  * data, including the null terminator.
1688  */
1689 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1690                                      handle_t *handle,
1691                                      struct inode *inode,
1692                                      const char *symname)
1693 {
1694         struct buffer_head **bhs = NULL;
1695         const char *c;
1696         struct super_block *sb = osb->sb;
1697         u64 p_blkno, p_blocks;
1698         int virtual, blocks, status, i, bytes_left;
1699
1700         bytes_left = i_size_read(inode) + 1;
1701         /* we can't trust i_blocks because we're actually going to
1702          * write i_size + 1 bytes. */
1703         blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1704
1705         trace_ocfs2_create_symlink_data((unsigned long long)inode->i_blocks,
1706                                         i_size_read(inode), blocks);
1707
1708         /* Sanity check -- make sure we're going to fit. */
1709         if (bytes_left >
1710             ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1711                 status = -EIO;
1712                 mlog_errno(status);
1713                 goto bail;
1714         }
1715
1716         bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1717         if (!bhs) {
1718                 status = -ENOMEM;
1719                 mlog_errno(status);
1720                 goto bail;
1721         }
1722
1723         status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1724                                              NULL);
1725         if (status < 0) {
1726                 mlog_errno(status);
1727                 goto bail;
1728         }
1729
1730         /* links can never be larger than one cluster so we know this
1731          * is all going to be contiguous, but do a sanity check
1732          * anyway. */
1733         if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1734                 status = -EIO;
1735                 mlog_errno(status);
1736                 goto bail;
1737         }
1738
1739         virtual = 0;
1740         while(bytes_left > 0) {
1741                 c = &symname[virtual * sb->s_blocksize];
1742
1743                 bhs[virtual] = sb_getblk(sb, p_blkno);
1744                 if (!bhs[virtual]) {
1745                         status = -ENOMEM;
1746                         mlog_errno(status);
1747                         goto bail;
1748                 }
1749                 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode),
1750                                               bhs[virtual]);
1751
1752                 status = ocfs2_journal_access(handle, INODE_CACHE(inode),
1753                                               bhs[virtual],
1754                                               OCFS2_JOURNAL_ACCESS_CREATE);
1755                 if (status < 0) {
1756                         mlog_errno(status);
1757                         goto bail;
1758                 }
1759
1760                 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1761
1762                 memcpy(bhs[virtual]->b_data, c,
1763                        (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1764                        bytes_left);
1765
1766                 ocfs2_journal_dirty(handle, bhs[virtual]);
1767
1768                 virtual++;
1769                 p_blkno++;
1770                 bytes_left -= sb->s_blocksize;
1771         }
1772
1773         status = 0;
1774 bail:
1775
1776         if (bhs) {
1777                 for(i = 0; i < blocks; i++)
1778                         brelse(bhs[i]);
1779                 kfree(bhs);
1780         }
1781
1782         if (status)
1783                 mlog_errno(status);
1784         return status;
1785 }
1786
1787 static int ocfs2_symlink(struct user_namespace *mnt_userns,
1788                          struct inode *dir,
1789                          struct dentry *dentry,
1790                          const char *symname)
1791 {
1792         int status, l, credits;
1793         u64 newsize;
1794         struct ocfs2_super *osb = NULL;
1795         struct inode *inode = NULL;
1796         struct super_block *sb;
1797         struct buffer_head *new_fe_bh = NULL;
1798         struct buffer_head *parent_fe_bh = NULL;
1799         struct ocfs2_dinode *fe = NULL;
1800         struct ocfs2_dinode *dirfe;
1801         handle_t *handle = NULL;
1802         struct ocfs2_alloc_context *inode_ac = NULL;
1803         struct ocfs2_alloc_context *data_ac = NULL;
1804         struct ocfs2_alloc_context *xattr_ac = NULL;
1805         int want_clusters = 0;
1806         int xattr_credits = 0;
1807         struct ocfs2_security_xattr_info si = {
1808                 .enable = 1,
1809         };
1810         int did_quota = 0, did_quota_inode = 0;
1811         struct ocfs2_dir_lookup_result lookup = { NULL, };
1812         sigset_t oldset;
1813         int did_block_signals = 0;
1814         struct ocfs2_dentry_lock *dl = NULL;
1815
1816         trace_ocfs2_symlink_begin(dir, dentry, symname,
1817                                   dentry->d_name.len, dentry->d_name.name);
1818
1819         status = dquot_initialize(dir);
1820         if (status) {
1821                 mlog_errno(status);
1822                 goto bail;
1823         }
1824
1825         sb = dir->i_sb;
1826         osb = OCFS2_SB(sb);
1827
1828         l = strlen(symname) + 1;
1829
1830         credits = ocfs2_calc_symlink_credits(sb);
1831
1832         /* lock the parent directory */
1833         status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
1834         if (status < 0) {
1835                 if (status != -ENOENT)
1836                         mlog_errno(status);
1837                 return status;
1838         }
1839
1840         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1841         if (!ocfs2_read_links_count(dirfe)) {
1842                 /* can't make a file in a deleted directory. */
1843                 status = -ENOENT;
1844                 goto bail;
1845         }
1846
1847         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1848                                            dentry->d_name.len);
1849         if (status)
1850                 goto bail;
1851
1852         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1853                                               dentry->d_name.name,
1854                                               dentry->d_name.len, &lookup);
1855         if (status < 0) {
1856                 mlog_errno(status);
1857                 goto bail;
1858         }
1859
1860         status = ocfs2_reserve_new_inode(osb, &inode_ac);
1861         if (status < 0) {
1862                 if (status != -ENOSPC)
1863                         mlog_errno(status);
1864                 goto bail;
1865         }
1866
1867         inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO);
1868         if (IS_ERR(inode)) {
1869                 status = PTR_ERR(inode);
1870                 inode = NULL;
1871                 mlog_errno(status);
1872                 goto bail;
1873         }
1874
1875         /* get security xattr */
1876         status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
1877         if (status) {
1878                 if (status == -EOPNOTSUPP)
1879                         si.enable = 0;
1880                 else {
1881                         mlog_errno(status);
1882                         goto bail;
1883                 }
1884         }
1885
1886         /* calculate meta data/clusters for setting security xattr */
1887         if (si.enable) {
1888                 status = ocfs2_calc_security_init(dir, &si, &want_clusters,
1889                                                   &xattr_credits, &xattr_ac);
1890                 if (status < 0) {
1891                         mlog_errno(status);
1892                         goto bail;
1893                 }
1894         }
1895
1896         /* don't reserve bitmap space for fast symlinks. */
1897         if (l > ocfs2_fast_symlink_chars(sb))
1898                 want_clusters += 1;
1899
1900         status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
1901         if (status < 0) {
1902                 if (status != -ENOSPC)
1903                         mlog_errno(status);
1904                 goto bail;
1905         }
1906
1907         handle = ocfs2_start_trans(osb, credits + xattr_credits);
1908         if (IS_ERR(handle)) {
1909                 status = PTR_ERR(handle);
1910                 handle = NULL;
1911                 mlog_errno(status);
1912                 goto bail;
1913         }
1914
1915         /* Starting to change things, restart is no longer possible. */
1916         ocfs2_block_signals(&oldset);
1917         did_block_signals = 1;
1918
1919         status = dquot_alloc_inode(inode);
1920         if (status)
1921                 goto bail;
1922         did_quota_inode = 1;
1923
1924         trace_ocfs2_symlink_create(dir, dentry, dentry->d_name.len,
1925                                    dentry->d_name.name,
1926                                    (unsigned long long)OCFS2_I(dir)->ip_blkno,
1927                                    inode->i_mode);
1928
1929         status = ocfs2_mknod_locked(osb, dir, inode,
1930                                     0, &new_fe_bh, parent_fe_bh, handle,
1931                                     inode_ac);
1932         if (status < 0) {
1933                 mlog_errno(status);
1934                 goto bail;
1935         }
1936
1937         fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1938         inode->i_rdev = 0;
1939         newsize = l - 1;
1940         inode->i_op = &ocfs2_symlink_inode_operations;
1941         inode_nohighmem(inode);
1942         if (l > ocfs2_fast_symlink_chars(sb)) {
1943                 u32 offset = 0;
1944
1945                 status = dquot_alloc_space_nodirty(inode,
1946                     ocfs2_clusters_to_bytes(osb->sb, 1));
1947                 if (status)
1948                         goto bail;
1949                 did_quota = 1;
1950                 inode->i_mapping->a_ops = &ocfs2_aops;
1951                 status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
1952                                               new_fe_bh,
1953                                               handle, data_ac, NULL,
1954                                               NULL);
1955                 if (status < 0) {
1956                         if (status != -ENOSPC && status != -EINTR) {
1957                                 mlog(ML_ERROR,
1958                                      "Failed to extend file to %llu\n",
1959                                      (unsigned long long)newsize);
1960                                 mlog_errno(status);
1961                                 status = -ENOSPC;
1962                         }
1963                         goto bail;
1964                 }
1965                 i_size_write(inode, newsize);
1966                 inode->i_blocks = ocfs2_inode_sector_count(inode);
1967         } else {
1968                 inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
1969                 memcpy((char *) fe->id2.i_symlink, symname, l);
1970                 i_size_write(inode, newsize);
1971                 inode->i_blocks = 0;
1972         }
1973
1974         status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1975         if (status < 0) {
1976                 mlog_errno(status);
1977                 goto bail;
1978         }
1979
1980         if (!ocfs2_inode_is_fast_symlink(inode)) {
1981                 status = ocfs2_create_symlink_data(osb, handle, inode,
1982                                                    symname);
1983                 if (status < 0) {
1984                         mlog_errno(status);
1985                         goto bail;
1986                 }
1987         }
1988
1989         if (si.enable) {
1990                 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
1991                                                  xattr_ac, data_ac);
1992                 if (status < 0) {
1993                         mlog_errno(status);
1994                         goto bail;
1995                 }
1996         }
1997
1998         /*
1999          * Do this before adding the entry to the directory. We add
2000          * also set d_op after success so that ->d_iput() will cleanup
2001          * the dentry lock even if ocfs2_add_entry() fails below.
2002          */
2003         status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
2004         if (status) {
2005                 mlog_errno(status);
2006                 goto bail;
2007         }
2008
2009         dl = dentry->d_fsdata;
2010
2011         status = ocfs2_add_entry(handle, dentry, inode,
2012                                  le64_to_cpu(fe->i_blkno), parent_fe_bh,
2013                                  &lookup);
2014         if (status < 0) {
2015                 mlog_errno(status);
2016                 goto bail;
2017         }
2018
2019         insert_inode_hash(inode);
2020         d_instantiate(dentry, inode);
2021 bail:
2022         if (status < 0 && did_quota)
2023                 dquot_free_space_nodirty(inode,
2024                                         ocfs2_clusters_to_bytes(osb->sb, 1));
2025         if (status < 0 && did_quota_inode)
2026                 dquot_free_inode(inode);
2027         if (handle) {
2028                 if (status < 0 && fe)
2029                         ocfs2_set_links_count(fe, 0);
2030                 ocfs2_commit_trans(osb, handle);
2031         }
2032
2033         ocfs2_inode_unlock(dir, 1);
2034         if (did_block_signals)
2035                 ocfs2_unblock_signals(&oldset);
2036
2037         brelse(new_fe_bh);
2038         brelse(parent_fe_bh);
2039         kfree(si.value);
2040         ocfs2_free_dir_lookup_result(&lookup);
2041         if (inode_ac)
2042                 ocfs2_free_alloc_context(inode_ac);
2043         if (data_ac)
2044                 ocfs2_free_alloc_context(data_ac);
2045         if (xattr_ac)
2046                 ocfs2_free_alloc_context(xattr_ac);
2047         if ((status < 0) && inode) {
2048                 if (dl)
2049                         ocfs2_cleanup_add_entry_failure(osb, dentry, inode);
2050
2051                 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
2052                 clear_nlink(inode);
2053                 iput(inode);
2054         }
2055
2056         if (status)
2057                 mlog_errno(status);
2058
2059         return status;
2060 }
2061
2062 static int ocfs2_blkno_stringify(u64 blkno, char *name)
2063 {
2064         int status, namelen;
2065
2066         namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
2067                            (long long)blkno);
2068         if (namelen <= 0) {
2069                 if (namelen)
2070                         status = namelen;
2071                 else
2072                         status = -EINVAL;
2073                 mlog_errno(status);
2074                 goto bail;
2075         }
2076         if (namelen != OCFS2_ORPHAN_NAMELEN) {
2077                 status = -EINVAL;
2078                 mlog_errno(status);
2079                 goto bail;
2080         }
2081
2082         trace_ocfs2_blkno_stringify(blkno, name, namelen);
2083
2084         status = 0;
2085 bail:
2086         if (status < 0)
2087                 mlog_errno(status);
2088         return status;
2089 }
2090
2091 static int ocfs2_lookup_lock_orphan_dir(struct ocfs2_super *osb,
2092                                         struct inode **ret_orphan_dir,
2093                                         struct buffer_head **ret_orphan_dir_bh)
2094 {
2095         struct inode *orphan_dir_inode;
2096         struct buffer_head *orphan_dir_bh = NULL;
2097         int ret = 0;
2098
2099         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2100                                                        ORPHAN_DIR_SYSTEM_INODE,
2101                                                        osb->slot_num);
2102         if (!orphan_dir_inode) {
2103                 ret = -ENOENT;
2104                 mlog_errno(ret);
2105                 return ret;
2106         }
2107
2108         inode_lock(orphan_dir_inode);
2109
2110         ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2111         if (ret < 0) {
2112                 inode_unlock(orphan_dir_inode);
2113                 iput(orphan_dir_inode);
2114
2115                 mlog_errno(ret);
2116                 return ret;
2117         }
2118
2119         *ret_orphan_dir = orphan_dir_inode;
2120         *ret_orphan_dir_bh = orphan_dir_bh;
2121
2122         return 0;
2123 }
2124
2125 static int __ocfs2_prepare_orphan_dir(struct inode *orphan_dir_inode,
2126                                       struct buffer_head *orphan_dir_bh,
2127                                       u64 blkno,
2128                                       char *name,
2129                                       struct ocfs2_dir_lookup_result *lookup,
2130                                       bool dio)
2131 {
2132         int ret;
2133         struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb);
2134         int namelen = dio ?
2135                         (OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN) :
2136                         OCFS2_ORPHAN_NAMELEN;
2137
2138         if (dio) {
2139                 ret = snprintf(name, OCFS2_DIO_ORPHAN_PREFIX_LEN + 1, "%s",
2140                                 OCFS2_DIO_ORPHAN_PREFIX);
2141                 if (ret != OCFS2_DIO_ORPHAN_PREFIX_LEN) {
2142                         ret = -EINVAL;
2143                         mlog_errno(ret);
2144                         return ret;
2145                 }
2146
2147                 ret = ocfs2_blkno_stringify(blkno,
2148                                 name + OCFS2_DIO_ORPHAN_PREFIX_LEN);
2149         } else
2150                 ret = ocfs2_blkno_stringify(blkno, name);
2151         if (ret < 0) {
2152                 mlog_errno(ret);
2153                 return ret;
2154         }
2155
2156         ret = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2157                                            orphan_dir_bh, name,
2158                                            namelen, lookup);
2159         if (ret < 0) {
2160                 mlog_errno(ret);
2161                 return ret;
2162         }
2163
2164         return 0;
2165 }
2166
2167 /**
2168  * ocfs2_prepare_orphan_dir() - Prepare an orphan directory for
2169  * insertion of an orphan.
2170  * @osb: ocfs2 file system
2171  * @ret_orphan_dir: Orphan dir inode - returned locked!
2172  * @blkno: Actual block number of the inode to be inserted into orphan dir.
2173  * @lookup: dir lookup result, to be passed back into functions like
2174  *          ocfs2_orphan_add
2175  *
2176  * Returns zero on success and the ret_orphan_dir, name and lookup
2177  * fields will be populated.
2178  *
2179  * Returns non-zero on failure.
2180  */
2181 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2182                                     struct inode **ret_orphan_dir,
2183                                     u64 blkno,
2184                                     char *name,
2185                                     struct ocfs2_dir_lookup_result *lookup,
2186                                     bool dio)
2187 {
2188         struct inode *orphan_dir_inode = NULL;
2189         struct buffer_head *orphan_dir_bh = NULL;
2190         int ret = 0;
2191
2192         ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir_inode,
2193                                            &orphan_dir_bh);
2194         if (ret < 0) {
2195                 mlog_errno(ret);
2196                 return ret;
2197         }
2198
2199         ret = __ocfs2_prepare_orphan_dir(orphan_dir_inode, orphan_dir_bh,
2200                                          blkno, name, lookup, dio);
2201         if (ret < 0) {
2202                 mlog_errno(ret);
2203                 goto out;
2204         }
2205
2206         *ret_orphan_dir = orphan_dir_inode;
2207
2208 out:
2209         brelse(orphan_dir_bh);
2210
2211         if (ret) {
2212                 ocfs2_inode_unlock(orphan_dir_inode, 1);
2213                 inode_unlock(orphan_dir_inode);
2214                 iput(orphan_dir_inode);
2215         }
2216
2217         if (ret)
2218                 mlog_errno(ret);
2219         return ret;
2220 }
2221
2222 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2223                             handle_t *handle,
2224                             struct inode *inode,
2225                             struct buffer_head *fe_bh,
2226                             char *name,
2227                             struct ocfs2_dir_lookup_result *lookup,
2228                             struct inode *orphan_dir_inode,
2229                             bool dio)
2230 {
2231         struct buffer_head *orphan_dir_bh = NULL;
2232         int status = 0;
2233         struct ocfs2_dinode *orphan_fe;
2234         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
2235         int namelen = dio ?
2236                         (OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN) :
2237                         OCFS2_ORPHAN_NAMELEN;
2238
2239         trace_ocfs2_orphan_add_begin(
2240                                 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2241
2242         status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh);
2243         if (status < 0) {
2244                 mlog_errno(status);
2245                 goto leave;
2246         }
2247
2248         status = ocfs2_journal_access_di(handle,
2249                                          INODE_CACHE(orphan_dir_inode),
2250                                          orphan_dir_bh,
2251                                          OCFS2_JOURNAL_ACCESS_WRITE);
2252         if (status < 0) {
2253                 mlog_errno(status);
2254                 goto leave;
2255         }
2256
2257         /*
2258          * We're going to journal the change of i_flags and i_orphaned_slot.
2259          * It's safe anyway, though some callers may duplicate the journaling.
2260          * Journaling within the func just make the logic look more
2261          * straightforward.
2262          */
2263         status = ocfs2_journal_access_di(handle,
2264                                          INODE_CACHE(inode),
2265                                          fe_bh,
2266                                          OCFS2_JOURNAL_ACCESS_WRITE);
2267         if (status < 0) {
2268                 mlog_errno(status);
2269                 goto leave;
2270         }
2271
2272         /* we're a cluster, and nlink can change on disk from
2273          * underneath us... */
2274         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2275         if (S_ISDIR(inode->i_mode))
2276                 ocfs2_add_links_count(orphan_fe, 1);
2277         set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2278         ocfs2_journal_dirty(handle, orphan_dir_bh);
2279
2280         status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2281                                    namelen, inode,
2282                                    OCFS2_I(inode)->ip_blkno,
2283                                    orphan_dir_bh, lookup);
2284         if (status < 0) {
2285                 mlog_errno(status);
2286                 goto rollback;
2287         }
2288
2289         if (dio) {
2290                 /* Update flag OCFS2_DIO_ORPHANED_FL and record the orphan
2291                  * slot.
2292                  */
2293                 fe->i_flags |= cpu_to_le32(OCFS2_DIO_ORPHANED_FL);
2294                 fe->i_dio_orphaned_slot = cpu_to_le16(osb->slot_num);
2295         } else {
2296                 fe->i_flags |= cpu_to_le32(OCFS2_ORPHANED_FL);
2297                 OCFS2_I(inode)->ip_flags &= ~OCFS2_INODE_SKIP_ORPHAN_DIR;
2298
2299                 /* Record which orphan dir our inode now resides
2300                  * in. delete_inode will use this to determine which orphan
2301                  * dir to lock. */
2302                 fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
2303         }
2304
2305         ocfs2_journal_dirty(handle, fe_bh);
2306
2307         trace_ocfs2_orphan_add_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
2308                                    osb->slot_num);
2309
2310 rollback:
2311         if (status < 0) {
2312                 if (S_ISDIR(inode->i_mode))
2313                         ocfs2_add_links_count(orphan_fe, -1);
2314                 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2315         }
2316
2317 leave:
2318         brelse(orphan_dir_bh);
2319
2320         return status;
2321 }
2322
2323 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2324 int ocfs2_orphan_del(struct ocfs2_super *osb,
2325                      handle_t *handle,
2326                      struct inode *orphan_dir_inode,
2327                      struct inode *inode,
2328                      struct buffer_head *orphan_dir_bh,
2329                      bool dio)
2330 {
2331         char name[OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN + 1];
2332         struct ocfs2_dinode *orphan_fe;
2333         int status = 0;
2334         struct ocfs2_dir_lookup_result lookup = { NULL, };
2335
2336         if (dio) {
2337                 status = snprintf(name, OCFS2_DIO_ORPHAN_PREFIX_LEN + 1, "%s",
2338                                 OCFS2_DIO_ORPHAN_PREFIX);
2339                 if (status != OCFS2_DIO_ORPHAN_PREFIX_LEN) {
2340                         status = -EINVAL;
2341                         mlog_errno(status);
2342                         return status;
2343                 }
2344
2345                 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno,
2346                                 name + OCFS2_DIO_ORPHAN_PREFIX_LEN);
2347         } else
2348                 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2349         if (status < 0) {
2350                 mlog_errno(status);
2351                 goto leave;
2352         }
2353
2354         trace_ocfs2_orphan_del(
2355              (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2356              name, strlen(name));
2357
2358         status = ocfs2_journal_access_di(handle,
2359                                          INODE_CACHE(orphan_dir_inode),
2360                                          orphan_dir_bh,
2361                                          OCFS2_JOURNAL_ACCESS_WRITE);
2362         if (status < 0) {
2363                 mlog_errno(status);
2364                 goto leave;
2365         }
2366
2367         /* find it's spot in the orphan directory */
2368         status = ocfs2_find_entry(name, strlen(name), orphan_dir_inode,
2369                                   &lookup);
2370         if (status) {
2371                 mlog_errno(status);
2372                 goto leave;
2373         }
2374
2375         /* remove it from the orphan directory */
2376         status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup);
2377         if (status < 0) {
2378                 mlog_errno(status);
2379                 goto leave;
2380         }
2381
2382         /* do the i_nlink dance! :) */
2383         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2384         if (S_ISDIR(inode->i_mode))
2385                 ocfs2_add_links_count(orphan_fe, -1);
2386         set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2387         ocfs2_journal_dirty(handle, orphan_dir_bh);
2388
2389 leave:
2390         ocfs2_free_dir_lookup_result(&lookup);
2391
2392         if (status)
2393                 mlog_errno(status);
2394         return status;
2395 }
2396
2397 /**
2398  * ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to receive a newly
2399  * allocated file. This is different from the typical 'add to orphan dir'
2400  * operation in that the inode does not yet exist. This is a problem because
2401  * the orphan dir stringifies the inode block number to come up with it's
2402  * dirent. Obviously if the inode does not yet exist we have a chicken and egg
2403  * problem. This function works around it by calling deeper into the orphan
2404  * and suballoc code than other callers. Use this only by necessity.
2405  * @dir: The directory which this inode will ultimately wind up under - not the
2406  * orphan dir!
2407  * @dir_bh: buffer_head the @dir inode block
2408  * @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled
2409  * with the string to be used for orphan dirent. Pass back to the orphan dir
2410  * code.
2411  * @ret_orphan_dir: orphan dir inode returned to be passed back into orphan
2412  * dir code.
2413  * @ret_di_blkno: block number where the new inode will be allocated.
2414  * @orphan_insert: Dir insert context to be passed back into orphan dir code.
2415  * @ret_inode_ac: Inode alloc context to be passed back to the allocator.
2416  *
2417  * Returns zero on success and the ret_orphan_dir, name and lookup
2418  * fields will be populated.
2419  *
2420  * Returns non-zero on failure.
2421  */
2422 static int ocfs2_prep_new_orphaned_file(struct inode *dir,
2423                                         struct buffer_head *dir_bh,
2424                                         char *orphan_name,
2425                                         struct inode **ret_orphan_dir,
2426                                         u64 *ret_di_blkno,
2427                                         struct ocfs2_dir_lookup_result *orphan_insert,
2428                                         struct ocfs2_alloc_context **ret_inode_ac)
2429 {
2430         int ret;
2431         u64 di_blkno;
2432         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2433         struct inode *orphan_dir = NULL;
2434         struct buffer_head *orphan_dir_bh = NULL;
2435         struct ocfs2_alloc_context *inode_ac = NULL;
2436
2437         ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh);
2438         if (ret < 0) {
2439                 mlog_errno(ret);
2440                 return ret;
2441         }
2442
2443         /* reserve an inode spot */
2444         ret = ocfs2_reserve_new_inode(osb, &inode_ac);
2445         if (ret < 0) {
2446                 if (ret != -ENOSPC)
2447                         mlog_errno(ret);
2448                 goto out;
2449         }
2450
2451         ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac,
2452                                        &di_blkno);
2453         if (ret) {
2454                 mlog_errno(ret);
2455                 goto out;
2456         }
2457
2458         ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh,
2459                                          di_blkno, orphan_name, orphan_insert,
2460                                          false);
2461         if (ret < 0) {
2462                 mlog_errno(ret);
2463                 goto out;
2464         }
2465
2466 out:
2467         if (ret == 0) {
2468                 *ret_orphan_dir = orphan_dir;
2469                 *ret_di_blkno = di_blkno;
2470                 *ret_inode_ac = inode_ac;
2471                 /*
2472                  * orphan_name and orphan_insert are already up to
2473                  * date via prepare_orphan_dir
2474                  */
2475         } else {
2476                 /* Unroll reserve_new_inode* */
2477                 if (inode_ac)
2478                         ocfs2_free_alloc_context(inode_ac);
2479
2480                 /* Unroll orphan dir locking */
2481                 inode_unlock(orphan_dir);
2482                 ocfs2_inode_unlock(orphan_dir, 1);
2483                 iput(orphan_dir);
2484         }
2485
2486         brelse(orphan_dir_bh);
2487
2488         return ret;
2489 }
2490
2491 int ocfs2_create_inode_in_orphan(struct inode *dir,
2492                                  int mode,
2493                                  struct inode **new_inode)
2494 {
2495         int status, did_quota_inode = 0;
2496         struct inode *inode = NULL;
2497         struct inode *orphan_dir = NULL;
2498         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2499         handle_t *handle = NULL;
2500         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
2501         struct buffer_head *parent_di_bh = NULL;
2502         struct buffer_head *new_di_bh = NULL;
2503         struct ocfs2_alloc_context *inode_ac = NULL;
2504         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
2505         u64 di_blkno, suballoc_loc;
2506         u16 suballoc_bit;
2507
2508         status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2509         if (status < 0) {
2510                 if (status != -ENOENT)
2511                         mlog_errno(status);
2512                 return status;
2513         }
2514
2515         status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh,
2516                                               orphan_name, &orphan_dir,
2517                                               &di_blkno, &orphan_insert, &inode_ac);
2518         if (status < 0) {
2519                 if (status != -ENOSPC)
2520                         mlog_errno(status);
2521                 goto leave;
2522         }
2523
2524         inode = ocfs2_get_init_inode(dir, mode);
2525         if (IS_ERR(inode)) {
2526                 status = PTR_ERR(inode);
2527                 inode = NULL;
2528                 mlog_errno(status);
2529                 goto leave;
2530         }
2531
2532         handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0));
2533         if (IS_ERR(handle)) {
2534                 status = PTR_ERR(handle);
2535                 handle = NULL;
2536                 mlog_errno(status);
2537                 goto leave;
2538         }
2539
2540         status = dquot_alloc_inode(inode);
2541         if (status)
2542                 goto leave;
2543         did_quota_inode = 1;
2544
2545         status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac,
2546                                               &suballoc_loc,
2547                                               &suballoc_bit, di_blkno);
2548         if (status < 0) {
2549                 mlog_errno(status);
2550                 goto leave;
2551         }
2552
2553         clear_nlink(inode);
2554         /* do the real work now. */
2555         status = __ocfs2_mknod_locked(dir, inode,
2556                                       0, &new_di_bh, parent_di_bh, handle,
2557                                       inode_ac, di_blkno, suballoc_loc,
2558                                       suballoc_bit);
2559         if (status < 0) {
2560                 mlog_errno(status);
2561                 goto leave;
2562         }
2563
2564         status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
2565                                   &orphan_insert, orphan_dir, false);
2566         if (status < 0) {
2567                 mlog_errno(status);
2568                 goto leave;
2569         }
2570
2571         /* get open lock so that only nodes can't remove it from orphan dir. */
2572         status = ocfs2_open_lock(inode);
2573         if (status < 0)
2574                 mlog_errno(status);
2575
2576         insert_inode_hash(inode);
2577 leave:
2578         if (status < 0 && did_quota_inode)
2579                 dquot_free_inode(inode);
2580         if (handle)
2581                 ocfs2_commit_trans(osb, handle);
2582
2583         if (orphan_dir) {
2584                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
2585                 ocfs2_inode_unlock(orphan_dir, 1);
2586                 inode_unlock(orphan_dir);
2587                 iput(orphan_dir);
2588         }
2589
2590         if ((status < 0) && inode) {
2591                 clear_nlink(inode);
2592                 iput(inode);
2593         }
2594
2595         if (inode_ac)
2596                 ocfs2_free_alloc_context(inode_ac);
2597
2598         brelse(new_di_bh);
2599
2600         if (!status)
2601                 *new_inode = inode;
2602
2603         ocfs2_free_dir_lookup_result(&orphan_insert);
2604
2605         ocfs2_inode_unlock(dir, 1);
2606         brelse(parent_di_bh);
2607         return status;
2608 }
2609
2610 int ocfs2_add_inode_to_orphan(struct ocfs2_super *osb,
2611         struct inode *inode)
2612 {
2613         char orphan_name[OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN + 1];
2614         struct inode *orphan_dir_inode = NULL;
2615         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
2616         struct buffer_head *di_bh = NULL;
2617         int status = 0;
2618         handle_t *handle = NULL;
2619         struct ocfs2_dinode *di = NULL;
2620
2621         status = ocfs2_inode_lock(inode, &di_bh, 1);
2622         if (status < 0) {
2623                 mlog_errno(status);
2624                 goto bail;
2625         }
2626
2627         di = (struct ocfs2_dinode *) di_bh->b_data;
2628         /*
2629          * Another append dio crashed?
2630          * If so, manually recover it first.
2631          */
2632         if (unlikely(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL))) {
2633                 status = ocfs2_truncate_file(inode, di_bh, i_size_read(inode));
2634                 if (status < 0) {
2635                         if (status != -ENOSPC)
2636                                 mlog_errno(status);
2637                         goto bail_unlock_inode;
2638                 }
2639
2640                 status = ocfs2_del_inode_from_orphan(osb, inode, di_bh, 0, 0);
2641                 if (status < 0) {
2642                         mlog_errno(status);
2643                         goto bail_unlock_inode;
2644                 }
2645         }
2646
2647         status = ocfs2_prepare_orphan_dir(osb, &orphan_dir_inode,
2648                         OCFS2_I(inode)->ip_blkno,
2649                         orphan_name,
2650                         &orphan_insert,
2651                         true);
2652         if (status < 0) {
2653                 mlog_errno(status);
2654                 goto bail_unlock_inode;
2655         }
2656
2657         handle = ocfs2_start_trans(osb,
2658                         OCFS2_INODE_ADD_TO_ORPHAN_CREDITS);
2659         if (IS_ERR(handle)) {
2660                 status = PTR_ERR(handle);
2661                 goto bail_unlock_orphan;
2662         }
2663
2664         status = ocfs2_orphan_add(osb, handle, inode, di_bh, orphan_name,
2665                         &orphan_insert, orphan_dir_inode, true);
2666         if (status)
2667                 mlog_errno(status);
2668
2669         ocfs2_commit_trans(osb, handle);
2670
2671 bail_unlock_orphan:
2672         ocfs2_inode_unlock(orphan_dir_inode, 1);
2673         inode_unlock(orphan_dir_inode);
2674         iput(orphan_dir_inode);
2675
2676         ocfs2_free_dir_lookup_result(&orphan_insert);
2677
2678 bail_unlock_inode:
2679         ocfs2_inode_unlock(inode, 1);
2680         brelse(di_bh);
2681
2682 bail:
2683         return status;
2684 }
2685
2686 int ocfs2_del_inode_from_orphan(struct ocfs2_super *osb,
2687                 struct inode *inode, struct buffer_head *di_bh,
2688                 int update_isize, loff_t end)
2689 {
2690         struct inode *orphan_dir_inode = NULL;
2691         struct buffer_head *orphan_dir_bh = NULL;
2692         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2693         handle_t *handle = NULL;
2694         int status = 0;
2695
2696         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2697                         ORPHAN_DIR_SYSTEM_INODE,
2698                         le16_to_cpu(di->i_dio_orphaned_slot));
2699         if (!orphan_dir_inode) {
2700                 status = -ENOENT;
2701                 mlog_errno(status);
2702                 goto bail;
2703         }
2704
2705         inode_lock(orphan_dir_inode);
2706         status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2707         if (status < 0) {
2708                 inode_unlock(orphan_dir_inode);
2709                 iput(orphan_dir_inode);
2710                 mlog_errno(status);
2711                 goto bail;
2712         }
2713
2714         handle = ocfs2_start_trans(osb,
2715                         OCFS2_INODE_DEL_FROM_ORPHAN_CREDITS);
2716         if (IS_ERR(handle)) {
2717                 status = PTR_ERR(handle);
2718                 goto bail_unlock_orphan;
2719         }
2720
2721         BUG_ON(!(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL)));
2722
2723         status = ocfs2_orphan_del(osb, handle, orphan_dir_inode,
2724                                 inode, orphan_dir_bh, true);
2725         if (status < 0) {
2726                 mlog_errno(status);
2727                 goto bail_commit;
2728         }
2729
2730         status = ocfs2_journal_access_di(handle,
2731                         INODE_CACHE(inode),
2732                         di_bh,
2733                         OCFS2_JOURNAL_ACCESS_WRITE);
2734         if (status < 0) {
2735                 mlog_errno(status);
2736                 goto bail_commit;
2737         }
2738
2739         di->i_flags &= ~cpu_to_le32(OCFS2_DIO_ORPHANED_FL);
2740         di->i_dio_orphaned_slot = 0;
2741
2742         if (update_isize) {
2743                 status = ocfs2_set_inode_size(handle, inode, di_bh, end);
2744                 if (status)
2745                         mlog_errno(status);
2746         } else
2747                 ocfs2_journal_dirty(handle, di_bh);
2748
2749 bail_commit:
2750         ocfs2_commit_trans(osb, handle);
2751
2752 bail_unlock_orphan:
2753         ocfs2_inode_unlock(orphan_dir_inode, 1);
2754         inode_unlock(orphan_dir_inode);
2755         brelse(orphan_dir_bh);
2756         iput(orphan_dir_inode);
2757
2758 bail:
2759         return status;
2760 }
2761
2762 int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
2763                                    struct inode *inode,
2764                                    struct dentry *dentry)
2765 {
2766         int status = 0;
2767         struct buffer_head *parent_di_bh = NULL;
2768         handle_t *handle = NULL;
2769         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2770         struct ocfs2_dinode *dir_di, *di;
2771         struct inode *orphan_dir_inode = NULL;
2772         struct buffer_head *orphan_dir_bh = NULL;
2773         struct buffer_head *di_bh = NULL;
2774         struct ocfs2_dir_lookup_result lookup = { NULL, };
2775
2776         trace_ocfs2_mv_orphaned_inode_to_new(dir, dentry,
2777                                 dentry->d_name.len, dentry->d_name.name,
2778                                 (unsigned long long)OCFS2_I(dir)->ip_blkno,
2779                                 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2780
2781         status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2782         if (status < 0) {
2783                 if (status != -ENOENT)
2784                         mlog_errno(status);
2785                 return status;
2786         }
2787
2788         dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data;
2789         if (!dir_di->i_links_count) {
2790                 /* can't make a file in a deleted directory. */
2791                 status = -ENOENT;
2792                 goto leave;
2793         }
2794
2795         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
2796                                            dentry->d_name.len);
2797         if (status)
2798                 goto leave;
2799
2800         /* get a spot inside the dir. */
2801         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_di_bh,
2802                                               dentry->d_name.name,
2803                                               dentry->d_name.len, &lookup);
2804         if (status < 0) {
2805                 mlog_errno(status);
2806                 goto leave;
2807         }
2808
2809         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2810                                                        ORPHAN_DIR_SYSTEM_INODE,
2811                                                        osb->slot_num);
2812         if (!orphan_dir_inode) {
2813                 status = -ENOENT;
2814                 mlog_errno(status);
2815                 goto leave;
2816         }
2817
2818         inode_lock(orphan_dir_inode);
2819
2820         status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2821         if (status < 0) {
2822                 mlog_errno(status);
2823                 inode_unlock(orphan_dir_inode);
2824                 iput(orphan_dir_inode);
2825                 goto leave;
2826         }
2827
2828         status = ocfs2_read_inode_block(inode, &di_bh);
2829         if (status < 0) {
2830                 mlog_errno(status);
2831                 goto orphan_unlock;
2832         }
2833
2834         handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
2835         if (IS_ERR(handle)) {
2836                 status = PTR_ERR(handle);
2837                 handle = NULL;
2838                 mlog_errno(status);
2839                 goto orphan_unlock;
2840         }
2841
2842         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
2843                                          di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2844         if (status < 0) {
2845                 mlog_errno(status);
2846                 goto out_commit;
2847         }
2848
2849         status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
2850                                   orphan_dir_bh, false);
2851         if (status < 0) {
2852                 mlog_errno(status);
2853                 goto out_commit;
2854         }
2855
2856         di = (struct ocfs2_dinode *)di_bh->b_data;
2857         di->i_flags &= ~cpu_to_le32(OCFS2_ORPHANED_FL);
2858         di->i_orphaned_slot = 0;
2859         set_nlink(inode, 1);
2860         ocfs2_set_links_count(di, inode->i_nlink);
2861         ocfs2_update_inode_fsync_trans(handle, inode, 1);
2862         ocfs2_journal_dirty(handle, di_bh);
2863
2864         status = ocfs2_add_entry(handle, dentry, inode,
2865                                  OCFS2_I(inode)->ip_blkno, parent_di_bh,
2866                                  &lookup);
2867         if (status < 0) {
2868                 mlog_errno(status);
2869                 goto out_commit;
2870         }
2871
2872         status = ocfs2_dentry_attach_lock(dentry, inode,
2873                                           OCFS2_I(dir)->ip_blkno);
2874         if (status) {
2875                 mlog_errno(status);
2876                 goto out_commit;
2877         }
2878
2879         d_instantiate(dentry, inode);
2880         status = 0;
2881 out_commit:
2882         ocfs2_commit_trans(osb, handle);
2883 orphan_unlock:
2884         ocfs2_inode_unlock(orphan_dir_inode, 1);
2885         inode_unlock(orphan_dir_inode);
2886         iput(orphan_dir_inode);
2887 leave:
2888
2889         ocfs2_inode_unlock(dir, 1);
2890
2891         brelse(di_bh);
2892         brelse(parent_di_bh);
2893         brelse(orphan_dir_bh);
2894
2895         ocfs2_free_dir_lookup_result(&lookup);
2896
2897         if (status)
2898                 mlog_errno(status);
2899
2900         return status;
2901 }
2902
2903 const struct inode_operations ocfs2_dir_iops = {
2904         .create         = ocfs2_create,
2905         .lookup         = ocfs2_lookup,
2906         .link           = ocfs2_link,
2907         .unlink         = ocfs2_unlink,
2908         .rmdir          = ocfs2_unlink,
2909         .symlink        = ocfs2_symlink,
2910         .mkdir          = ocfs2_mkdir,
2911         .mknod          = ocfs2_mknod,
2912         .rename         = ocfs2_rename,
2913         .setattr        = ocfs2_setattr,
2914         .getattr        = ocfs2_getattr,
2915         .permission     = ocfs2_permission,
2916         .listxattr      = ocfs2_listxattr,
2917         .fiemap         = ocfs2_fiemap,
2918         .get_acl        = ocfs2_iop_get_acl,
2919         .set_acl        = ocfs2_iop_set_acl,
2920         .fileattr_get   = ocfs2_fileattr_get,
2921         .fileattr_set   = ocfs2_fileattr_set,
2922 };