fs/ocfs2/quota_local.c

   1 /*
   2  *  Implementation of operations over local quota file
   3  */
   4
   5 #include <linux/fs.h>
   6 #include <linux/slab.h>
   7 #include <linux/quota.h>
   8 #include <linux/quotaops.h>
   9 #include <linux/module.h>
  10
  11 #define MLOG_MASK_PREFIX ML_QUOTA
  12 #include <cluster/masklog.h>
  13
  14 #include "ocfs2_fs.h"
  15 #include "ocfs2.h"
  16 #include "inode.h"
  17 #include "alloc.h"
  18 #include "file.h"
  19 #include "buffer_head_io.h"
  20 #include "journal.h"
  21 #include "sysfile.h"
  22 #include "dlmglue.h"
  23 #include "quota.h"
  24 #include "uptodate.h"
  25
  26 /* Number of local quota structures per block */
  27 static inline unsigned int ol_quota_entries_per_block(struct super_block *sb)
  28 {
  29         return ((sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) /
  30                 sizeof(struct ocfs2_local_disk_dqblk));
  31 }
  32
  33 /* Number of blocks with entries in one chunk */
  34 static inline unsigned int ol_chunk_blocks(struct super_block *sb)
  35 {
  36         return ((sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
  37                  OCFS2_QBLK_RESERVED_SPACE) << 3) /
  38                ol_quota_entries_per_block(sb);
  39 }
  40
  41 /* Number of entries in a chunk bitmap */
  42 static unsigned int ol_chunk_entries(struct super_block *sb)
  43 {
  44         return ol_chunk_blocks(sb) * ol_quota_entries_per_block(sb);
  45 }
  46
  47 /* Offset of the chunk in quota file */
  48 static unsigned int ol_quota_chunk_block(struct super_block *sb, int c)
  49 {
  50         /* 1 block for local quota file info, 1 block per chunk for chunk info */
  51         return 1 + (ol_chunk_blocks(sb) + 1) * c;
  52 }
  53
  54 static unsigned int ol_dqblk_block(struct super_block *sb, int c, int off)
  55 {
  56         int epb = ol_quota_entries_per_block(sb);
  57
  58         return ol_quota_chunk_block(sb, c) + 1 + off / epb;
  59 }
  60
  61 static unsigned int ol_dqblk_block_off(struct super_block *sb, int c, int off)
  62 {
  63         int epb = ol_quota_entries_per_block(sb);
  64
  65         return (off % epb) * sizeof(struct ocfs2_local_disk_dqblk);
  66 }
  67
  68 /* Offset of the dquot structure in the quota file */
  69 static loff_t ol_dqblk_off(struct super_block *sb, int c, int off)
  70 {
  71         return (ol_dqblk_block(sb, c, off) << sb->s_blocksize_bits) +
  72                ol_dqblk_block_off(sb, c, off);
  73 }
  74
  75 /* Compute block number from given offset */
  76 static inline unsigned int ol_dqblk_file_block(struct super_block *sb, loff_t off)
  77 {
  78         return off >> sb->s_blocksize_bits;
  79 }
  80
  81 static inline unsigned int ol_dqblk_block_offset(struct super_block *sb, loff_t off)
  82 {
  83         return off & ((1 << sb->s_blocksize_bits) - 1);
  84 }
  85
  86 /* Compute offset in the chunk of a structure with the given offset */
  87 static int ol_dqblk_chunk_off(struct super_block *sb, int c, loff_t off)
  88 {
  89         int epb = ol_quota_entries_per_block(sb);
  90
  91         return ((off >> sb->s_blocksize_bits) -
  92                         ol_quota_chunk_block(sb, c) - 1) * epb
  93                + ((unsigned int)(off & ((1 << sb->s_blocksize_bits) - 1))) /
  94                  sizeof(struct ocfs2_local_disk_dqblk);
  95 }
  96
  97 /* Write bufferhead into the fs */
  98 static int ocfs2_modify_bh(struct inode *inode, struct buffer_head *bh,
  99                 void (*modify)(struct buffer_head *, void *), void *private)
 100 {
 101         struct super_block *sb = inode->i_sb;
 102         handle_t *handle;
 103         int status;
 104
 105         handle = ocfs2_start_trans(OCFS2_SB(sb),
 106                                    OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
 107         if (IS_ERR(handle)) {
 108                 status = PTR_ERR(handle);
 109                 mlog_errno(status);
 110                 return status;
 111         }
 112         status = ocfs2_journal_access_dq(handle, INODE_CACHE(inode), bh,
 113                                          OCFS2_JOURNAL_ACCESS_WRITE);
 114         if (status < 0) {
 115                 mlog_errno(status);
 116                 ocfs2_commit_trans(OCFS2_SB(sb), handle);
 117                 return status;
 118         }
 119         lock_buffer(bh);
 120         modify(bh, private);
 121         unlock_buffer(bh);
 122         status = ocfs2_journal_dirty(handle, bh);
 123         if (status < 0) {
 124                 mlog_errno(status);
 125                 ocfs2_commit_trans(OCFS2_SB(sb), handle);
 126                 return status;
 127         }
 128         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
 129         if (status < 0) {
 130                 mlog_errno(status);
 131                 return status;
 132         }
 133         return 0;
 134 }
 135
 136 /* Check whether we understand format of quota files */
 137 static int ocfs2_local_check_quota_file(struct super_block *sb, int type)
 138 {
 139         unsigned int lmagics[MAXQUOTAS] = OCFS2_LOCAL_QMAGICS;
 140         unsigned int lversions[MAXQUOTAS] = OCFS2_LOCAL_QVERSIONS;
 141         unsigned int gmagics[MAXQUOTAS] = OCFS2_GLOBAL_QMAGICS;
 142         unsigned int gversions[MAXQUOTAS] = OCFS2_GLOBAL_QVERSIONS;
 143         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 144                                         GROUP_QUOTA_SYSTEM_INODE };
 145         struct buffer_head *bh = NULL;
 146         struct inode *linode = sb_dqopt(sb)->files[type];
 147         struct inode *ginode = NULL;
 148         struct ocfs2_disk_dqheader *dqhead;
 149         int status, ret = 0;
 150
 151         /* First check whether we understand local quota file */
 152         status = ocfs2_read_quota_block(linode, 0, &bh);
 153         if (status) {
 154                 mlog_errno(status);
 155                 mlog(ML_ERROR, "failed to read quota file header (type=%d)\n",
 156                         type);
 157                 goto out_err;
 158         }
 159         dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
 160         if (le32_to_cpu(dqhead->dqh_magic) != lmagics[type]) {
 161                 mlog(ML_ERROR, "quota file magic does not match (%u != %u),"
 162                         " type=%d\n", le32_to_cpu(dqhead->dqh_magic),
 163                         lmagics[type], type);
 164                 goto out_err;
 165         }
 166         if (le32_to_cpu(dqhead->dqh_version) != lversions[type]) {
 167                 mlog(ML_ERROR, "quota file version does not match (%u != %u),"
 168                         " type=%d\n", le32_to_cpu(dqhead->dqh_version),
 169                         lversions[type], type);
 170                 goto out_err;
 171         }
 172         brelse(bh);
 173         bh = NULL;
 174
 175         /* Next check whether we understand global quota file */
 176         ginode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 177                                                 OCFS2_INVALID_SLOT);
 178         if (!ginode) {
 179                 mlog(ML_ERROR, "cannot get global quota file inode "
 180                                 "(type=%d)\n", type);
 181                 goto out_err;
 182         }
 183         /* Since the header is read only, we don't care about locking */
 184         status = ocfs2_read_quota_block(ginode, 0, &bh);
 185         if (status) {
 186                 mlog_errno(status);
 187                 mlog(ML_ERROR, "failed to read global quota file header "
 188                                 "(type=%d)\n", type);
 189                 goto out_err;
 190         }
 191         dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
 192         if (le32_to_cpu(dqhead->dqh_magic) != gmagics[type]) {
 193                 mlog(ML_ERROR, "global quota file magic does not match "
 194                         "(%u != %u), type=%d\n",
 195                         le32_to_cpu(dqhead->dqh_magic), gmagics[type], type);
 196                 goto out_err;
 197         }
 198         if (le32_to_cpu(dqhead->dqh_version) != gversions[type]) {
 199                 mlog(ML_ERROR, "global quota file version does not match "
 200                         "(%u != %u), type=%d\n",
 201                         le32_to_cpu(dqhead->dqh_version), gversions[type],
 202                         type);
 203                 goto out_err;
 204         }
 205
 206         ret = 1;
 207 out_err:
 208         brelse(bh);
 209         iput(ginode);
 210         return ret;
 211 }
 212
 213 /* Release given list of quota file chunks */
 214 static void ocfs2_release_local_quota_bitmaps(struct list_head *head)
 215 {
 216         struct ocfs2_quota_chunk *pos, *next;
 217
 218         list_for_each_entry_safe(pos, next, head, qc_chunk) {
 219                 list_del(&pos->qc_chunk);
 220                 brelse(pos->qc_headerbh);
 221                 kmem_cache_free(ocfs2_qf_chunk_cachep, pos);
 222         }
 223 }
 224
 225 /* Load quota bitmaps into memory */
 226 static int ocfs2_load_local_quota_bitmaps(struct inode *inode,
 227                         struct ocfs2_local_disk_dqinfo *ldinfo,
 228                         struct list_head *head)
 229 {
 230         struct ocfs2_quota_chunk *newchunk;
 231         int i, status;
 232
 233         INIT_LIST_HEAD(head);
 234         for (i = 0; i < le32_to_cpu(ldinfo->dqi_chunks); i++) {
 235                 newchunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
 236                 if (!newchunk) {
 237                         ocfs2_release_local_quota_bitmaps(head);
 238                         return -ENOMEM;
 239                 }
 240                 newchunk->qc_num = i;
 241                 newchunk->qc_headerbh = NULL;
 242                 status = ocfs2_read_quota_block(inode,
 243                                 ol_quota_chunk_block(inode->i_sb, i),
 244                                 &newchunk->qc_headerbh);
 245                 if (status) {
 246                         mlog_errno(status);
 247                         kmem_cache_free(ocfs2_qf_chunk_cachep, newchunk);
 248                         ocfs2_release_local_quota_bitmaps(head);
 249                         return status;
 250                 }
 251                 list_add_tail(&newchunk->qc_chunk, head);
 252         }
 253         return 0;
 254 }
 255
 256 static void olq_update_info(struct buffer_head *bh, void *private)
 257 {
 258         struct mem_dqinfo *info = private;
 259         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 260         struct ocfs2_local_disk_dqinfo *ldinfo;
 261
 262         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 263                                                 OCFS2_LOCAL_INFO_OFF);
 264         spin_lock(&dq_data_lock);
 265         ldinfo->dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
 266         ldinfo->dqi_chunks = cpu_to_le32(oinfo->dqi_chunks);
 267         ldinfo->dqi_blocks = cpu_to_le32(oinfo->dqi_blocks);
 268         spin_unlock(&dq_data_lock);
 269 }
 270
 271 static int ocfs2_add_recovery_chunk(struct super_block *sb,
 272                                     struct ocfs2_local_disk_chunk *dchunk,
 273                                     int chunk,
 274                                     struct list_head *head)
 275 {
 276         struct ocfs2_recovery_chunk *rc;
 277
 278         rc = kmalloc(sizeof(struct ocfs2_recovery_chunk), GFP_NOFS);
 279         if (!rc)
 280                 return -ENOMEM;
 281         rc->rc_chunk = chunk;
 282         rc->rc_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
 283         if (!rc->rc_bitmap) {
 284                 kfree(rc);
 285                 return -ENOMEM;
 286         }
 287         memcpy(rc->rc_bitmap, dchunk->dqc_bitmap,
 288                (ol_chunk_entries(sb) + 7) >> 3);
 289         list_add_tail(&rc->rc_list, head);
 290         return 0;
 291 }
 292
 293 static void free_recovery_list(struct list_head *head)
 294 {
 295         struct ocfs2_recovery_chunk *next;
 296         struct ocfs2_recovery_chunk *rchunk;
 297
 298         list_for_each_entry_safe(rchunk, next, head, rc_list) {
 299                 list_del(&rchunk->rc_list);
 300                 kfree(rchunk->rc_bitmap);
 301                 kfree(rchunk);
 302         }
 303 }
 304
 305 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec)
 306 {
 307         int type;
 308
 309         for (type = 0; type < MAXQUOTAS; type++)
 310                 free_recovery_list(&(rec->r_list[type]));
 311         kfree(rec);
 312 }
 313
 314 /* Load entries in our quota file we have to recover*/
 315 static int ocfs2_recovery_load_quota(struct inode *lqinode,
 316                                      struct ocfs2_local_disk_dqinfo *ldinfo,
 317                                      int type,
 318                                      struct list_head *head)
 319 {
 320         struct super_block *sb = lqinode->i_sb;
 321         struct buffer_head *hbh;
 322         struct ocfs2_local_disk_chunk *dchunk;
 323         int i, chunks = le32_to_cpu(ldinfo->dqi_chunks);
 324         int status = 0;
 325
 326         for (i = 0; i < chunks; i++) {
 327                 hbh = NULL;
 328                 status = ocfs2_read_quota_block(lqinode,
 329                                                 ol_quota_chunk_block(sb, i),
 330                                                 &hbh);
 331                 if (status) {
 332                         mlog_errno(status);
 333                         break;
 334                 }
 335                 dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
 336                 if (le32_to_cpu(dchunk->dqc_free) < ol_chunk_entries(sb))
 337                         status = ocfs2_add_recovery_chunk(sb, dchunk, i, head);
 338                 brelse(hbh);
 339                 if (status < 0)
 340                         break;
 341         }
 342         if (status < 0)
 343                 free_recovery_list(head);
 344         return status;
 345 }
 346
 347 static struct ocfs2_quota_recovery *ocfs2_alloc_quota_recovery(void)
 348 {
 349         int type;
 350         struct ocfs2_quota_recovery *rec;
 351
 352         rec = kmalloc(sizeof(struct ocfs2_quota_recovery), GFP_NOFS);
 353         if (!rec)
 354                 return NULL;
 355         for (type = 0; type < MAXQUOTAS; type++)
 356                 INIT_LIST_HEAD(&(rec->r_list[type]));
 357         return rec;
 358 }
 359
 360 /* Load information we need for quota recovery into memory */
 361 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
 362                                                 struct ocfs2_super *osb,
 363                                                 int slot_num)
 364 {
 365         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 366                                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 367         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 368                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 369         struct super_block *sb = osb->sb;
 370         struct ocfs2_local_disk_dqinfo *ldinfo;
 371         struct inode *lqinode;
 372         struct buffer_head *bh;
 373         int type;
 374         int status = 0;
 375         struct ocfs2_quota_recovery *rec;
 376
 377         mlog(ML_NOTICE, "Beginning quota recovery in slot %u\n", slot_num);
 378         rec = ocfs2_alloc_quota_recovery();
 379         if (!rec)
 380                 return ERR_PTR(-ENOMEM);
 381         /* First init... */
 382
 383         for (type = 0; type < MAXQUOTAS; type++) {
 384                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 385                         continue;
 386                 /* At this point, journal of the slot is already replayed so
 387                  * we can trust metadata and data of the quota file */
 388                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
 389                 if (!lqinode) {
 390                         status = -ENOENT;
 391                         goto out;
 392                 }
 393                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
 394                                                OCFS2_META_LOCK_RECOVERY);
 395                 if (status < 0) {
 396                         mlog_errno(status);
 397                         goto out_put;
 398                 }
 399                 /* Now read local header */
 400                 bh = NULL;
 401                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
 402                 if (status) {
 403                         mlog_errno(status);
 404                         mlog(ML_ERROR, "failed to read quota file info header "
 405                                 "(slot=%d type=%d)\n", slot_num, type);
 406                         goto out_lock;
 407                 }
 408                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 409                                                         OCFS2_LOCAL_INFO_OFF);
 410                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 411                                                    &rec->r_list[type]);
 412                 brelse(bh);
 413 out_lock:
 414                 ocfs2_inode_unlock(lqinode, 1);
 415 out_put:
 416                 iput(lqinode);
 417                 if (status < 0)
 418                         break;
 419         }
 420 out:
 421         if (status < 0) {
 422                 ocfs2_free_quota_recovery(rec);
 423                 rec = ERR_PTR(status);
 424         }
 425         return rec;
 426 }
 427
 428 /* Sync changes in local quota file into global quota file and
 429  * reinitialize local quota file.
 430  * The function expects local quota file to be already locked and
 431  * dqonoff_mutex locked. */
 432 static int ocfs2_recover_local_quota_file(struct inode *lqinode,
 433                                           int type,
 434                                           struct ocfs2_quota_recovery *rec)
 435 {
 436         struct super_block *sb = lqinode->i_sb;
 437         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 438         struct ocfs2_local_disk_chunk *dchunk;
 439         struct ocfs2_local_disk_dqblk *dqblk;
 440         struct dquot *dquot;
 441         handle_t *handle;
 442         struct buffer_head *hbh = NULL, *qbh = NULL;
 443         int status = 0;
 444         int bit, chunk;
 445         struct ocfs2_recovery_chunk *rchunk, *next;
 446         qsize_t spacechange, inodechange;
 447
 448         mlog_entry("ino=%lu type=%u", (unsigned long)lqinode->i_ino, type);
 449
 450         list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
 451                 chunk = rchunk->rc_chunk;
 452                 hbh = NULL;
 453                 status = ocfs2_read_quota_block(lqinode,
 454                                                 ol_quota_chunk_block(sb, chunk),
 455                                                 &hbh);
 456                 if (status) {
 457                         mlog_errno(status);
 458                         break;
 459                 }
 460                 dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
 461                 for_each_set_bit(bit, rchunk->rc_bitmap, ol_chunk_entries(sb)) {
 462                         qbh = NULL;
 463                         status = ocfs2_read_quota_block(lqinode,
 464                                                 ol_dqblk_block(sb, chunk, bit),
 465                                                 &qbh);
 466                         if (status) {
 467                                 mlog_errno(status);
 468                                 break;
 469                         }
 470                         dqblk = (struct ocfs2_local_disk_dqblk *)(qbh->b_data +
 471                                 ol_dqblk_block_off(sb, chunk, bit));
 472                         dquot = dqget(sb, le64_to_cpu(dqblk->dqb_id), type);
 473                         if (!dquot) {
 474                                 status = -EIO;
 475                                 mlog(ML_ERROR, "Failed to get quota structure "
 476                                      "for id %u, type %d. Cannot finish quota "
 477                                      "file recovery.\n",
 478                                      (unsigned)le64_to_cpu(dqblk->dqb_id),
 479                                      type);
 480                                 goto out_put_bh;
 481                         }
 482                         status = ocfs2_lock_global_qf(oinfo, 1);
 483                         if (status < 0) {
 484                                 mlog_errno(status);
 485                                 goto out_put_dquot;
 486                         }
 487
 488                         handle = ocfs2_start_trans(OCFS2_SB(sb),
 489                                                    OCFS2_QSYNC_CREDITS);
 490                         if (IS_ERR(handle)) {
 491                                 status = PTR_ERR(handle);
 492                                 mlog_errno(status);
 493                                 goto out_drop_lock;
 494                         }
 495                         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 496                         spin_lock(&dq_data_lock);
 497                         /* Add usage from quota entry into quota changes
 498                          * of our node. Auxiliary variables are important
 499                          * due to signedness */
 500                         spacechange = le64_to_cpu(dqblk->dqb_spacemod);
 501                         inodechange = le64_to_cpu(dqblk->dqb_inodemod);
 502                         dquot->dq_dqb.dqb_curspace += spacechange;
 503                         dquot->dq_dqb.dqb_curinodes += inodechange;
 504                         spin_unlock(&dq_data_lock);
 505                         /* We want to drop reference held by the crashed
 506                          * node. Since we have our own reference we know
 507                          * global structure actually won't be freed. */
 508                         status = ocfs2_global_release_dquot(dquot);
 509                         if (status < 0) {
 510                                 mlog_errno(status);
 511                                 goto out_commit;
 512                         }
 513                         /* Release local quota file entry */
 514                         status = ocfs2_journal_access_dq(handle,
 515                                         INODE_CACHE(lqinode),
 516                                         qbh, OCFS2_JOURNAL_ACCESS_WRITE);
 517                         if (status < 0) {
 518                                 mlog_errno(status);
 519                                 goto out_commit;
 520                         }
 521                         lock_buffer(qbh);
 522                         WARN_ON(!ocfs2_test_bit(bit, dchunk->dqc_bitmap));
 523                         ocfs2_clear_bit(bit, dchunk->dqc_bitmap);
 524                         le32_add_cpu(&dchunk->dqc_free, 1);
 525                         unlock_buffer(qbh);
 526                         status = ocfs2_journal_dirty(handle, qbh);
 527                         if (status < 0)
 528                                 mlog_errno(status);
 529 out_commit:
 530                         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 531                         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 532 out_drop_lock:
 533                         ocfs2_unlock_global_qf(oinfo, 1);
 534 out_put_dquot:
 535                         dqput(dquot);
 536 out_put_bh:
 537                         brelse(qbh);
 538                         if (status < 0)
 539                                 break;
 540                 }
 541                 brelse(hbh);
 542                 list_del(&rchunk->rc_list);
 543                 kfree(rchunk->rc_bitmap);
 544                 kfree(rchunk);
 545                 if (status < 0)
 546                         break;
 547         }
 548         if (status < 0)
 549                 free_recovery_list(&(rec->r_list[type]));
 550         mlog_exit(status);
 551         return status;
 552 }
 553
 554 /* Recover local quota files for given node different from us */
 555 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
 556                                 struct ocfs2_quota_recovery *rec,
 557                                 int slot_num)
 558 {
 559         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 560                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 561         struct super_block *sb = osb->sb;
 562         struct ocfs2_local_disk_dqinfo *ldinfo;
 563         struct buffer_head *bh;
 564         handle_t *handle;
 565         int type;
 566         int status = 0;
 567         struct inode *lqinode;
 568         unsigned int flags;
 569
 570         mlog(ML_NOTICE, "Finishing quota recovery in slot %u\n", slot_num);
 571         mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
 572         for (type = 0; type < MAXQUOTAS; type++) {
 573                 if (list_empty(&(rec->r_list[type])))
 574                         continue;
 575                 mlog(0, "Recovering quota in slot %d\n", slot_num);
 576                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
 577                 if (!lqinode) {
 578                         status = -ENOENT;
 579                         goto out;
 580                 }
 581                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
 582                                                        OCFS2_META_LOCK_NOQUEUE);
 583                 /* Someone else is holding the lock? Then he must be
 584                  * doing the recovery. Just skip the file... */
 585                 if (status == -EAGAIN) {
 586                         mlog(ML_NOTICE, "skipping quota recovery for slot %d "
 587                              "because quota file is locked.\n", slot_num);
 588                         status = 0;
 589                         goto out_put;
 590                 } else if (status < 0) {
 591                         mlog_errno(status);
 592                         goto out_put;
 593                 }
 594                 /* Now read local header */
 595                 bh = NULL;
 596                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
 597                 if (status) {
 598                         mlog_errno(status);
 599                         mlog(ML_ERROR, "failed to read quota file info header "
 600                                 "(slot=%d type=%d)\n", slot_num, type);
 601                         goto out_lock;
 602                 }
 603                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 604                                                         OCFS2_LOCAL_INFO_OFF);
 605                 /* Is recovery still needed? */
 606                 flags = le32_to_cpu(ldinfo->dqi_flags);
 607                 if (!(flags & OLQF_CLEAN))
 608                         status = ocfs2_recover_local_quota_file(lqinode,
 609                                                                 type,
 610                                                                 rec);
 611                 /* We don't want to mark file as clean when it is actually
 612                  * active */
 613                 if (slot_num == osb->slot_num)
 614                         goto out_bh;
 615                 /* Mark quota file as clean if we are recovering quota file of
 616                  * some other node. */
 617                 handle = ocfs2_start_trans(osb,
 618                                            OCFS2_LOCAL_QINFO_WRITE_CREDITS);
 619                 if (IS_ERR(handle)) {
 620                         status = PTR_ERR(handle);
 621                         mlog_errno(status);
 622                         goto out_bh;
 623                 }
 624                 status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
 625                                                  bh,
 626                                                  OCFS2_JOURNAL_ACCESS_WRITE);
 627                 if (status < 0) {
 628                         mlog_errno(status);
 629                         goto out_trans;
 630                 }
 631                 lock_buffer(bh);
 632                 ldinfo->dqi_flags = cpu_to_le32(flags | OLQF_CLEAN);
 633                 unlock_buffer(bh);
 634                 status = ocfs2_journal_dirty(handle, bh);
 635                 if (status < 0)
 636                         mlog_errno(status);
 637 out_trans:
 638                 ocfs2_commit_trans(osb, handle);
 639 out_bh:
 640                 brelse(bh);
 641 out_lock:
 642                 ocfs2_inode_unlock(lqinode, 1);
 643 out_put:
 644                 iput(lqinode);
 645                 if (status < 0)
 646                         break;
 647         }
 648 out:
 649         mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 650         kfree(rec);
 651         return status;
 652 }
 653
 654 /* Read information header from quota file */
 655 static int ocfs2_local_read_info(struct super_block *sb, int type)
 656 {
 657         struct ocfs2_local_disk_dqinfo *ldinfo;
 658         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 659         struct ocfs2_mem_dqinfo *oinfo;
 660         struct inode *lqinode = sb_dqopt(sb)->files[type];
 661         int status;
 662         struct buffer_head *bh = NULL;
 663         struct ocfs2_quota_recovery *rec;
 664         int locked = 0;
 665
 666         /* We don't need the lock and we have to acquire quota file locks
 667          * which will later depend on this lock */
 668         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 669         info->dqi_maxblimit = 0x7fffffffffffffffLL;
 670         info->dqi_maxilimit = 0x7fffffffffffffffLL;
 671         oinfo = kmalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
 672         if (!oinfo) {
 673                 mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
 674                                " info.");
 675                 goto out_err;
 676         }
 677         info->dqi_priv = oinfo;
 678         oinfo->dqi_type = type;
 679         INIT_LIST_HEAD(&oinfo->dqi_chunk);
 680         oinfo->dqi_rec = NULL;
 681         oinfo->dqi_lqi_bh = NULL;
 682         oinfo->dqi_ibh = NULL;
 683
 684         status = ocfs2_global_read_info(sb, type);
 685         if (status < 0)
 686                 goto out_err;
 687
 688         status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
 689         if (status < 0) {
 690                 mlog_errno(status);
 691                 goto out_err;
 692         }
 693         locked = 1;
 694
 695         /* Now read local header */
 696         status = ocfs2_read_quota_block(lqinode, 0, &bh);
 697         if (status) {
 698                 mlog_errno(status);
 699                 mlog(ML_ERROR, "failed to read quota file info header "
 700                         "(type=%d)\n", type);
 701                 goto out_err;
 702         }
 703         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 704                                                 OCFS2_LOCAL_INFO_OFF);
 705         info->dqi_flags = le32_to_cpu(ldinfo->dqi_flags);
 706         oinfo->dqi_chunks = le32_to_cpu(ldinfo->dqi_chunks);
 707         oinfo->dqi_blocks = le32_to_cpu(ldinfo->dqi_blocks);
 708         oinfo->dqi_ibh = bh;
 709
 710         /* We crashed when using local quota file? */
 711         if (!(info->dqi_flags & OLQF_CLEAN)) {
 712                 rec = OCFS2_SB(sb)->quota_rec;
 713                 if (!rec) {
 714                         rec = ocfs2_alloc_quota_recovery();
 715                         if (!rec) {
 716                                 status = -ENOMEM;
 717                                 mlog_errno(status);
 718                                 goto out_err;
 719                         }
 720                         OCFS2_SB(sb)->quota_rec = rec;
 721                 }
 722
 723                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 724                                                    &rec->r_list[type]);
 725                 if (status < 0) {
 726                         mlog_errno(status);
 727                         goto out_err;
 728                 }
 729         }
 730
 731         status = ocfs2_load_local_quota_bitmaps(lqinode,
 732                                                 ldinfo,
 733                                                 &oinfo->dqi_chunk);
 734         if (status < 0) {
 735                 mlog_errno(status);
 736                 goto out_err;
 737         }
 738
 739         /* Now mark quota file as used */
 740         info->dqi_flags &= ~OLQF_CLEAN;
 741         status = ocfs2_modify_bh(lqinode, bh, olq_update_info, info);
 742         if (status < 0) {
 743                 mlog_errno(status);
 744                 goto out_err;
 745         }
 746
 747         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 748         return 0;
 749 out_err:
 750         if (oinfo) {
 751                 iput(oinfo->dqi_gqinode);
 752                 ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 753                 ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 754                 brelse(oinfo->dqi_lqi_bh);
 755                 if (locked)
 756                         ocfs2_inode_unlock(lqinode, 1);
 757                 ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 758                 kfree(oinfo);
 759         }
 760         brelse(bh);
 761         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 762         return -1;
 763 }
 764
 765 /* Write local info to quota file */
 766 static int ocfs2_local_write_info(struct super_block *sb, int type)
 767 {
 768         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 769         struct buffer_head *bh = ((struct ocfs2_mem_dqinfo *)info->dqi_priv)
 770                                                 ->dqi_ibh;
 771         int status;
 772
 773         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type], bh, olq_update_info,
 774                                  info);
 775         if (status < 0) {
 776                 mlog_errno(status);
 777                 return -1;
 778         }
 779
 780         return 0;
 781 }
 782
 783 /* Release info from memory */
 784 static int ocfs2_local_free_info(struct super_block *sb, int type)
 785 {
 786         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 787         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 788         struct ocfs2_quota_chunk *chunk;
 789         struct ocfs2_local_disk_chunk *dchunk;
 790         int mark_clean = 1, len;
 791         int status;
 792
 793         /* At this point we know there are no more dquots and thus
 794          * even if there's some sync in the pdflush queue, it won't
 795          * find any dquots and return without doing anything */
 796         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 797         iput(oinfo->dqi_gqinode);
 798         ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 799         ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 800         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 801                 dchunk = (struct ocfs2_local_disk_chunk *)
 802                                         (chunk->qc_headerbh->b_data);
 803                 if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 804                         len = ol_chunk_entries(sb);
 805                 } else {
 806                         len = (oinfo->dqi_blocks -
 807                                ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 808                               * ol_quota_entries_per_block(sb);
 809                 }
 810                 /* Not all entries free? Bug! */
 811                 if (le32_to_cpu(dchunk->dqc_free) != len) {
 812                         mlog(ML_ERROR, "releasing quota file with used "
 813                                         "entries (type=%d)\n", type);
 814                         mark_clean = 0;
 815                 }
 816         }
 817         ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 818
 819         /* dqonoff_mutex protects us against racing with recovery thread... */
 820         if (oinfo->dqi_rec) {
 821                 ocfs2_free_quota_recovery(oinfo->dqi_rec);
 822                 mark_clean = 0;
 823         }
 824
 825         if (!mark_clean)
 826                 goto out;
 827
 828         /* Mark local file as clean */
 829         info->dqi_flags |= OLQF_CLEAN;
 830         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type],
 831                                  oinfo->dqi_ibh,
 832                                  olq_update_info,
 833                                  info);
 834         if (status < 0) {
 835                 mlog_errno(status);
 836                 goto out;
 837         }
 838
 839 out:
 840         ocfs2_inode_unlock(sb_dqopt(sb)->files[type], 1);
 841         brelse(oinfo->dqi_ibh);
 842         brelse(oinfo->dqi_lqi_bh);
 843         kfree(oinfo);
 844         return 0;
 845 }
 846
 847 static void olq_set_dquot(struct buffer_head *bh, void *private)
 848 {
 849         struct ocfs2_dquot *od = private;
 850         struct ocfs2_local_disk_dqblk *dqblk;
 851         struct super_block *sb = od->dq_dquot.dq_sb;
 852
 853         dqblk = (struct ocfs2_local_disk_dqblk *)(bh->b_data
 854                 + ol_dqblk_block_offset(sb, od->dq_local_off));
 855
 856         dqblk->dqb_id = cpu_to_le64(od->dq_dquot.dq_id);
 857         spin_lock(&dq_data_lock);
 858         dqblk->dqb_spacemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curspace -
 859                                           od->dq_origspace);
 860         dqblk->dqb_inodemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curinodes -
 861                                           od->dq_originodes);
 862         spin_unlock(&dq_data_lock);
 863         mlog(0, "Writing local dquot %u space %lld inodes %lld\n",
 864              od->dq_dquot.dq_id, (long long)le64_to_cpu(dqblk->dqb_spacemod),
 865              (long long)le64_to_cpu(dqblk->dqb_inodemod));
 866 }
 867
 868 /* Write dquot to local quota file */
 869 static int ocfs2_local_write_dquot(struct dquot *dquot)
 870 {
 871         struct super_block *sb = dquot->dq_sb;
 872         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
 873         struct buffer_head *bh = NULL;
 874         int status;
 875
 876         status = ocfs2_read_quota_block(sb_dqopt(sb)->files[dquot->dq_type],
 877                                     ol_dqblk_file_block(sb, od->dq_local_off),
 878                                     &bh);
 879         if (status) {
 880                 mlog_errno(status);
 881                 goto out;
 882         }
 883         status = ocfs2_modify_bh(sb_dqopt(sb)->files[dquot->dq_type], bh,
 884                                  olq_set_dquot, od);
 885         if (status < 0) {
 886                 mlog_errno(status);
 887                 goto out;
 888         }
 889 out:
 890         brelse(bh);
 891         return status;
 892 }
 893
 894 /* Find free entry in local quota file */
 895 static struct ocfs2_quota_chunk *ocfs2_find_free_entry(struct super_block *sb,
 896                                                        int type,
 897                                                        int *offset)
 898 {
 899         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 900         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 901         struct ocfs2_quota_chunk *chunk;
 902         struct ocfs2_local_disk_chunk *dchunk;
 903         int found = 0, len;
 904
 905         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 906                 dchunk = (struct ocfs2_local_disk_chunk *)
 907                                                 chunk->qc_headerbh->b_data;
 908                 if (le32_to_cpu(dchunk->dqc_free) > 0) {
 909                         found = 1;
 910                         break;
 911                 }
 912         }
 913         if (!found)
 914                 return NULL;
 915
 916         if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 917                 len = ol_chunk_entries(sb);
 918         } else {
 919                 len = (oinfo->dqi_blocks -
 920                        ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 921                       * ol_quota_entries_per_block(sb);
 922         }
 923
 924         found = ocfs2_find_next_zero_bit(dchunk->dqc_bitmap, len, 0);
 925         /* We failed? */
 926         if (found == len) {
 927                 mlog(ML_ERROR, "Did not find empty entry in chunk %d with %u"
 928                      " entries free (type=%d)\n", chunk->qc_num,
 929                      le32_to_cpu(dchunk->dqc_free), type);
 930                 return ERR_PTR(-EIO);
 931         }
 932         *offset = found;
 933         return chunk;
 934 }
 935
 936 /* Add new chunk to the local quota file */
 937 static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
 938                                                         struct super_block *sb,
 939                                                         int type,
 940                                                         int *offset)
 941 {
 942         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 943         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 944         struct inode *lqinode = sb_dqopt(sb)->files[type];
 945         struct ocfs2_quota_chunk *chunk = NULL;
 946         struct ocfs2_local_disk_chunk *dchunk;
 947         int status;
 948         handle_t *handle;
 949         struct buffer_head *bh = NULL, *dbh = NULL;
 950         u64 p_blkno;
 951
 952         /* We are protected by dqio_sem so no locking needed */
 953         status = ocfs2_extend_no_holes(lqinode,
 954                                        lqinode->i_size + 2 * sb->s_blocksize,
 955                                        lqinode->i_size);
 956         if (status < 0) {
 957                 mlog_errno(status);
 958                 goto out;
 959         }
 960         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
 961                                           lqinode->i_size + 2 * sb->s_blocksize);
 962         if (status < 0) {
 963                 mlog_errno(status);
 964                 goto out;
 965         }
 966
 967         chunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
 968         if (!chunk) {
 969                 status = -ENOMEM;
 970                 mlog_errno(status);
 971                 goto out;
 972         }
 973         /* Local quota info and two new blocks we initialize */
 974         handle = ocfs2_start_trans(OCFS2_SB(sb),
 975                         OCFS2_LOCAL_QINFO_WRITE_CREDITS +
 976                         2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
 977         if (IS_ERR(handle)) {
 978                 status = PTR_ERR(handle);
 979                 mlog_errno(status);
 980                 goto out;
 981         }
 982
 983         /* Initialize chunk header */
 984         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
 985         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
 986                                              &p_blkno, NULL, NULL);
 987         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
 988         if (status < 0) {
 989                 mlog_errno(status);
 990                 goto out_trans;
 991         }
 992         bh = sb_getblk(sb, p_blkno);
 993         if (!bh) {
 994                 status = -ENOMEM;
 995                 mlog_errno(status);
 996                 goto out_trans;
 997         }
 998         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
 999         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
1000         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
1001                                          OCFS2_JOURNAL_ACCESS_CREATE);
1002         if (status < 0) {
1003                 mlog_errno(status);
1004                 goto out_trans;
1005         }
1006         lock_buffer(bh);
1007         dchunk->dqc_free = cpu_to_le32(ol_quota_entries_per_block(sb));
1008         memset(dchunk->dqc_bitmap, 0,
1009                sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
1010                OCFS2_QBLK_RESERVED_SPACE);
1011         unlock_buffer(bh);
1012         status = ocfs2_journal_dirty(handle, bh);
1013         if (status < 0) {
1014                 mlog_errno(status);
1015                 goto out_trans;
1016         }
1017
1018         /* Initialize new block with structures */
1019         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1020         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks + 1,
1021                                              &p_blkno, NULL, NULL);
1022         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1023         if (status < 0) {
1024                 mlog_errno(status);
1025                 goto out_trans;
1026         }
1027         dbh = sb_getblk(sb, p_blkno);
1028         if (!dbh) {
1029                 status = -ENOMEM;
1030                 mlog_errno(status);
1031                 goto out_trans;
1032         }
1033         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), dbh);
1034         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), dbh,
1035                                          OCFS2_JOURNAL_ACCESS_CREATE);
1036         if (status < 0) {
1037                 mlog_errno(status);
1038                 goto out_trans;
1039         }
1040         lock_buffer(dbh);
1041         memset(dbh->b_data, 0, sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE);
1042         unlock_buffer(dbh);
1043         status = ocfs2_journal_dirty(handle, dbh);
1044         if (status < 0) {
1045                 mlog_errno(status);
1046                 goto out_trans;
1047         }
1048
1049         /* Update local quotafile info */
1050         oinfo->dqi_blocks += 2;
1051         oinfo->dqi_chunks++;
1052         status = ocfs2_local_write_info(sb, type);
1053         if (status < 0) {
1054                 mlog_errno(status);
1055                 goto out_trans;
1056         }
1057         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1058         if (status < 0) {
1059                 mlog_errno(status);
1060                 goto out;
1061         }
1062
1063         list_add_tail(&chunk->qc_chunk, &oinfo->dqi_chunk);
1064         chunk->qc_num = list_entry(chunk->qc_chunk.prev,
1065                                    struct ocfs2_quota_chunk,
1066                                    qc_chunk)->qc_num + 1;
1067         chunk->qc_headerbh = bh;
1068         *offset = 0;
1069         return chunk;
1070 out_trans:
1071         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1072 out:
1073         brelse(bh);
1074         brelse(dbh);
1075         kmem_cache_free(ocfs2_qf_chunk_cachep, chunk);
1076         return ERR_PTR(status);
1077 }
1078
1079 /* Find free entry in local quota file */
1080 static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
1081                                                        struct super_block *sb,
1082                                                        int type,
1083                                                        int *offset)
1084 {
1085         struct mem_dqinfo *info = sb_dqinfo(sb, type);
1086         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
1087         struct ocfs2_quota_chunk *chunk;
1088         struct inode *lqinode = sb_dqopt(sb)->files[type];
1089         struct ocfs2_local_disk_chunk *dchunk;
1090         int epb = ol_quota_entries_per_block(sb);
1091         unsigned int chunk_blocks;
1092         struct buffer_head *bh;
1093         u64 p_blkno;
1094         int status;
1095         handle_t *handle;
1096
1097         if (list_empty(&oinfo->dqi_chunk))
1098                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1099         /* Is the last chunk full? */
1100         chunk = list_entry(oinfo->dqi_chunk.prev,
1101                         struct ocfs2_quota_chunk, qc_chunk);
1102         chunk_blocks = oinfo->dqi_blocks -
1103                         ol_quota_chunk_block(sb, chunk->qc_num) - 1;
1104         if (ol_chunk_blocks(sb) == chunk_blocks)
1105                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1106
1107         /* We are protected by dqio_sem so no locking needed */
1108         status = ocfs2_extend_no_holes(lqinode,
1109                                        lqinode->i_size + sb->s_blocksize,
1110                                        lqinode->i_size);
1111         if (status < 0) {
1112                 mlog_errno(status);
1113                 goto out;
1114         }
1115         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
1116                                           lqinode->i_size + sb->s_blocksize);
1117         if (status < 0) {
1118                 mlog_errno(status);
1119                 goto out;
1120         }
1121
1122         /* Get buffer from the just added block */
1123         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1124         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
1125                                              &p_blkno, NULL, NULL);
1126         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1127         if (status < 0) {
1128                 mlog_errno(status);
1129                 goto out;
1130         }
1131         bh = sb_getblk(sb, p_blkno);
1132         if (!bh) {
1133                 status = -ENOMEM;
1134                 mlog_errno(status);
1135                 goto out;
1136         }
1137         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
1138
1139         /* Local quota info, chunk header and the new block we initialize */
1140         handle = ocfs2_start_trans(OCFS2_SB(sb),
1141                         OCFS2_LOCAL_QINFO_WRITE_CREDITS +
1142                         2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
1143         if (IS_ERR(handle)) {
1144                 status = PTR_ERR(handle);
1145                 mlog_errno(status);
1146                 goto out;
1147         }
1148         /* Zero created block */
1149         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
1150                                  OCFS2_JOURNAL_ACCESS_CREATE);
1151         if (status < 0) {
1152                 mlog_errno(status);
1153                 goto out_trans;
1154         }
1155         lock_buffer(bh);
1156         memset(bh->b_data, 0, sb->s_blocksize);
1157         unlock_buffer(bh);
1158         status = ocfs2_journal_dirty(handle, bh);
1159         if (status < 0) {
1160                 mlog_errno(status);
1161                 goto out_trans;
1162         }
1163         /* Update chunk header */
1164         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
1165                                          chunk->qc_headerbh,
1166                                  OCFS2_JOURNAL_ACCESS_WRITE);
1167         if (status < 0) {
1168                 mlog_errno(status);
1169                 goto out_trans;
1170         }
1171
1172         dchunk = (struct ocfs2_local_disk_chunk *)chunk->qc_headerbh->b_data;
1173         lock_buffer(chunk->qc_headerbh);
1174         le32_add_cpu(&dchunk->dqc_free, ol_quota_entries_per_block(sb));
1175         unlock_buffer(chunk->qc_headerbh);
1176         status = ocfs2_journal_dirty(handle, chunk->qc_headerbh);
1177         if (status < 0) {
1178                 mlog_errno(status);
1179                 goto out_trans;
1180         }
1181         /* Update file header */
1182         oinfo->dqi_blocks++;
1183         status = ocfs2_local_write_info(sb, type);
1184         if (status < 0) {
1185                 mlog_errno(status);
1186                 goto out_trans;
1187         }
1188
1189         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1190         if (status < 0) {
1191                 mlog_errno(status);
1192                 goto out;
1193         }
1194         *offset = chunk_blocks * epb;
1195         return chunk;
1196 out_trans:
1197         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1198 out:
1199         return ERR_PTR(status);
1200 }
1201
1202 static void olq_alloc_dquot(struct buffer_head *bh, void *private)
1203 {
1204         int *offset = private;
1205         struct ocfs2_local_disk_chunk *dchunk;
1206
1207         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
1208         ocfs2_set_bit(*offset, dchunk->dqc_bitmap);
1209         le32_add_cpu(&dchunk->dqc_free, -1);
1210 }
1211
1212 /* Create dquot in the local file for given id */
1213 static int ocfs2_create_local_dquot(struct dquot *dquot)
1214 {
1215         struct super_block *sb = dquot->dq_sb;
1216         int type = dquot->dq_type;
1217         struct inode *lqinode = sb_dqopt(sb)->files[type];
1218         struct ocfs2_quota_chunk *chunk;
1219         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1220         int offset;
1221         int status;
1222
1223         chunk = ocfs2_find_free_entry(sb, type, &offset);
1224         if (!chunk) {
1225                 chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
1226                 if (IS_ERR(chunk))
1227                         return PTR_ERR(chunk);
1228         } else if (IS_ERR(chunk)) {
1229                 return PTR_ERR(chunk);
1230         }
1231         od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
1232         od->dq_chunk = chunk;
1233
1234         /* Initialize dquot structure on disk */
1235         status = ocfs2_local_write_dquot(dquot);
1236         if (status < 0) {
1237                 mlog_errno(status);
1238                 goto out;
1239         }
1240
1241         /* Mark structure as allocated */
1242         status = ocfs2_modify_bh(lqinode, chunk->qc_headerbh, olq_alloc_dquot,
1243                                  &offset);
1244         if (status < 0) {
1245                 mlog_errno(status);
1246                 goto out;
1247         }
1248 out:
1249         return status;
1250 }
1251
1252 /* Create entry in local file for dquot, load data from the global file */
1253 static int ocfs2_local_read_dquot(struct dquot *dquot)
1254 {
1255         int status;
1256
1257         mlog_entry("id=%u, type=%d\n", dquot->dq_id, dquot->dq_type);
1258
1259         status = ocfs2_global_read_dquot(dquot);
1260         if (status < 0) {
1261                 mlog_errno(status);
1262                 goto out_err;
1263         }
1264
1265         /* Now create entry in the local quota file */
1266         status = ocfs2_create_local_dquot(dquot);
1267         if (status < 0) {
1268                 mlog_errno(status);
1269                 goto out_err;
1270         }
1271         mlog_exit(0);
1272         return 0;
1273 out_err:
1274         mlog_exit(status);
1275         return status;
1276 }
1277
1278 /* Release dquot structure from local quota file. ocfs2_release_dquot() has
1279  * already started a transaction and obtained exclusive lock for global
1280  * quota file. */
1281 static int ocfs2_local_release_dquot(struct dquot *dquot)
1282 {
1283         int status;
1284         int type = dquot->dq_type;
1285         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1286         struct super_block *sb = dquot->dq_sb;
1287         struct ocfs2_local_disk_chunk *dchunk;
1288         int offset;
1289         handle_t *handle = journal_current_handle();
1290
1291         BUG_ON(!handle);
1292         /* First write all local changes to global file */
1293         status = ocfs2_global_release_dquot(dquot);
1294         if (status < 0) {
1295                 mlog_errno(status);
1296                 goto out;
1297         }
1298
1299         status = ocfs2_journal_access_dq(handle,
1300                         INODE_CACHE(sb_dqopt(sb)->files[type]),
1301                         od->dq_chunk->qc_headerbh, OCFS2_JOURNAL_ACCESS_WRITE);
1302         if (status < 0) {
1303                 mlog_errno(status);
1304                 goto out;
1305         }
1306         offset = ol_dqblk_chunk_off(sb, od->dq_chunk->qc_num,
1307                                              od->dq_local_off);
1308         dchunk = (struct ocfs2_local_disk_chunk *)
1309                         (od->dq_chunk->qc_headerbh->b_data);
1310         /* Mark structure as freed */
1311         lock_buffer(od->dq_chunk->qc_headerbh);
1312         ocfs2_clear_bit(offset, dchunk->dqc_bitmap);
1313         le32_add_cpu(&dchunk->dqc_free, 1);
1314         unlock_buffer(od->dq_chunk->qc_headerbh);
1315         status = ocfs2_journal_dirty(handle, od->dq_chunk->qc_headerbh);
1316         if (status < 0) {
1317                 mlog_errno(status);
1318                 goto out;
1319         }
1320         status = 0;
1321 out:
1322         /* Clear the read bit so that next time someone uses this
1323          * dquot he reads fresh info from disk and allocates local
1324          * dquot structure */
1325         clear_bit(DQ_READ_B, &dquot->dq_flags);
1326         return status;
1327 }
1328
1329 static const struct quota_format_ops ocfs2_format_ops = {
1330         .check_quota_file       = ocfs2_local_check_quota_file,
1331         .read_file_info         = ocfs2_local_read_info,
1332         .write_file_info        = ocfs2_global_write_info,
1333         .free_file_info         = ocfs2_local_free_info,
1334         .read_dqblk             = ocfs2_local_read_dquot,
1335         .commit_dqblk           = ocfs2_local_write_dquot,
1336         .release_dqblk          = ocfs2_local_release_dquot,
1337 };
1338
1339 struct quota_format_type ocfs2_quota_format = {
1340         .qf_fmt_id = QFMT_OCFS2,
1341         .qf_ops = &ocfs2_format_ops,
1342         .qf_owner = THIS_MODULE
1343 };