fs/ocfs2/quota_local.c

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