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         list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
 448                 chunk = rchunk->rc_chunk;
 449                 hbh = NULL;
 450                 status = ocfs2_read_quota_block(lqinode,
 451                                                 ol_quota_chunk_block(sb, chunk),
 452                                                 &hbh);
 453                 if (status) {
 454                         mlog_errno(status);
 455                         break;
 456                 }
 457                 dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
 458                 for_each_bit(bit, rchunk->rc_bitmap, ol_chunk_entries(sb)) {
 459                         qbh = NULL;
 460                         status = ocfs2_read_quota_block(lqinode,
 461                                                 ol_dqblk_block(sb, chunk, bit),
 462                                                 &qbh);
 463                         if (status) {
 464                                 mlog_errno(status);
 465                                 break;
 466                         }
 467                         dqblk = (struct ocfs2_local_disk_dqblk *)(qbh->b_data +
 468                                 ol_dqblk_block_off(sb, chunk, bit));
 469                         dquot = dqget(sb, le64_to_cpu(dqblk->dqb_id), type);
 470                         if (!dquot) {
 471                                 status = -EIO;
 472                                 mlog(ML_ERROR, "Failed to get quota structure "
 473                                      "for id %u, type %d. Cannot finish quota "
 474                                      "file recovery.\n",
 475                                      (unsigned)le64_to_cpu(dqblk->dqb_id),
 476                                      type);
 477                                 goto out_put_bh;
 478                         }
 479                         status = ocfs2_lock_global_qf(oinfo, 1);
 480                         if (status < 0) {
 481                                 mlog_errno(status);
 482                                 goto out_put_dquot;
 483                         }
 484
 485                         handle = ocfs2_start_trans(OCFS2_SB(sb),
 486                                                    OCFS2_QSYNC_CREDITS);
 487                         if (IS_ERR(handle)) {
 488                                 status = PTR_ERR(handle);
 489                                 mlog_errno(status);
 490                                 goto out_drop_lock;
 491                         }
 492                         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 493                         spin_lock(&dq_data_lock);
 494                         /* Add usage from quota entry into quota changes
 495                          * of our node. Auxiliary variables are important
 496                          * due to signedness */
 497                         spacechange = le64_to_cpu(dqblk->dqb_spacemod);
 498                         inodechange = le64_to_cpu(dqblk->dqb_inodemod);
 499                         dquot->dq_dqb.dqb_curspace += spacechange;
 500                         dquot->dq_dqb.dqb_curinodes += inodechange;
 501                         spin_unlock(&dq_data_lock);
 502                         /* We want to drop reference held by the crashed
 503                          * node. Since we have our own reference we know
 504                          * global structure actually won't be freed. */
 505                         status = ocfs2_global_release_dquot(dquot);
 506                         if (status < 0) {
 507                                 mlog_errno(status);
 508                                 goto out_commit;
 509                         }
 510                         /* Release local quota file entry */
 511                         status = ocfs2_journal_access_dq(handle, lqinode,
 512                                         qbh, OCFS2_JOURNAL_ACCESS_WRITE);
 513                         if (status < 0) {
 514                                 mlog_errno(status);
 515                                 goto out_commit;
 516                         }
 517                         lock_buffer(qbh);
 518                         WARN_ON(!ocfs2_test_bit(bit, dchunk->dqc_bitmap));
 519                         ocfs2_clear_bit(bit, dchunk->dqc_bitmap);
 520                         le32_add_cpu(&dchunk->dqc_free, 1);
 521                         unlock_buffer(qbh);
 522                         status = ocfs2_journal_dirty(handle, qbh);
 523                         if (status < 0)
 524                                 mlog_errno(status);
 525 out_commit:
 526                         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 527                         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 528 out_drop_lock:
 529                         ocfs2_unlock_global_qf(oinfo, 1);
 530 out_put_dquot:
 531                         dqput(dquot);
 532 out_put_bh:
 533                         brelse(qbh);
 534                         if (status < 0)
 535                                 break;
 536                 }
 537                 brelse(hbh);
 538                 list_del(&rchunk->rc_list);
 539                 kfree(rchunk->rc_bitmap);
 540                 kfree(rchunk);
 541                 if (status < 0)
 542                         break;
 543         }
 544         if (status < 0)
 545                 free_recovery_list(&(rec->r_list[type]));
 546         mlog_exit(status);
 547         return status;
 548 }
 549
 550 /* Recover local quota files for given node different from us */
 551 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
 552                                 struct ocfs2_quota_recovery *rec,
 553                                 int slot_num)
 554 {
 555         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 556                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 557         struct super_block *sb = osb->sb;
 558         struct ocfs2_local_disk_dqinfo *ldinfo;
 559         struct buffer_head *bh;
 560         handle_t *handle;
 561         int type;
 562         int status = 0;
 563         struct inode *lqinode;
 564         unsigned int flags;
 565
 566         mlog(ML_NOTICE, "Finishing quota recovery in slot %u\n", slot_num);
 567         mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
 568         for (type = 0; type < MAXQUOTAS; type++) {
 569                 if (list_empty(&(rec->r_list[type])))
 570                         continue;
 571                 mlog(0, "Recovering quota in slot %d\n", slot_num);
 572                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
 573                 if (!lqinode) {
 574                         status = -ENOENT;
 575                         goto out;
 576                 }
 577                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
 578                                                        OCFS2_META_LOCK_NOQUEUE);
 579                 /* Someone else is holding the lock? Then he must be
 580                  * doing the recovery. Just skip the file... */
 581                 if (status == -EAGAIN) {
 582                         mlog(ML_NOTICE, "skipping quota recovery for slot %d "
 583                              "because quota file is locked.\n", slot_num);
 584                         status = 0;
 585                         goto out_put;
 586                 } else if (status < 0) {
 587                         mlog_errno(status);
 588                         goto out_put;
 589                 }
 590                 /* Now read local header */
 591                 bh = NULL;
 592                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
 593                 if (status) {
 594                         mlog_errno(status);
 595                         mlog(ML_ERROR, "failed to read quota file info header "
 596                                 "(slot=%d type=%d)\n", slot_num, type);
 597                         goto out_lock;
 598                 }
 599                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 600                                                         OCFS2_LOCAL_INFO_OFF);
 601                 /* Is recovery still needed? */
 602                 flags = le32_to_cpu(ldinfo->dqi_flags);
 603                 if (!(flags & OLQF_CLEAN))
 604                         status = ocfs2_recover_local_quota_file(lqinode,
 605                                                                 type,
 606                                                                 rec);
 607                 /* We don't want to mark file as clean when it is actually
 608                  * active */
 609                 if (slot_num == osb->slot_num)
 610                         goto out_bh;
 611                 /* Mark quota file as clean if we are recovering quota file of
 612                  * some other node. */
 613                 handle = ocfs2_start_trans(osb, 1);
 614                 if (IS_ERR(handle)) {
 615                         status = PTR_ERR(handle);
 616                         mlog_errno(status);
 617                         goto out_bh;
 618                 }
 619                 status = ocfs2_journal_access_dq(handle, lqinode, bh,
 620                                                  OCFS2_JOURNAL_ACCESS_WRITE);
 621                 if (status < 0) {
 622                         mlog_errno(status);
 623                         goto out_trans;
 624                 }
 625                 lock_buffer(bh);
 626                 ldinfo->dqi_flags = cpu_to_le32(flags | OLQF_CLEAN);
 627                 unlock_buffer(bh);
 628                 status = ocfs2_journal_dirty(handle, bh);
 629                 if (status < 0)
 630                         mlog_errno(status);
 631 out_trans:
 632                 ocfs2_commit_trans(osb, handle);
 633 out_bh:
 634                 brelse(bh);
 635 out_lock:
 636                 ocfs2_inode_unlock(lqinode, 1);
 637 out_put:
 638                 iput(lqinode);
 639                 if (status < 0)
 640                         break;
 641         }
 642 out:
 643         mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 644         kfree(rec);
 645         return status;
 646 }
 647
 648 /* Read information header from quota file */
 649 static int ocfs2_local_read_info(struct super_block *sb, int type)
 650 {
 651         struct ocfs2_local_disk_dqinfo *ldinfo;
 652         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 653         struct ocfs2_mem_dqinfo *oinfo;
 654         struct inode *lqinode = sb_dqopt(sb)->files[type];
 655         int status;
 656         struct buffer_head *bh = NULL;
 657         struct ocfs2_quota_recovery *rec;
 658         int locked = 0;
 659
 660         /* We don't need the lock and we have to acquire quota file locks
 661          * which will later depend on this lock */
 662         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 663         info->dqi_maxblimit = 0x7fffffffffffffffLL;
 664         info->dqi_maxilimit = 0x7fffffffffffffffLL;
 665         oinfo = kmalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
 666         if (!oinfo) {
 667                 mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
 668                                " info.");
 669                 goto out_err;
 670         }
 671         info->dqi_priv = oinfo;
 672         oinfo->dqi_type = type;
 673         INIT_LIST_HEAD(&oinfo->dqi_chunk);
 674         oinfo->dqi_rec = NULL;
 675         oinfo->dqi_lqi_bh = NULL;
 676         oinfo->dqi_ibh = NULL;
 677
 678         status = ocfs2_global_read_info(sb, type);
 679         if (status < 0)
 680                 goto out_err;
 681
 682         status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
 683         if (status < 0) {
 684                 mlog_errno(status);
 685                 goto out_err;
 686         }
 687         locked = 1;
 688
 689         /* Now read local header */
 690         status = ocfs2_read_quota_block(lqinode, 0, &bh);
 691         if (status) {
 692                 mlog_errno(status);
 693                 mlog(ML_ERROR, "failed to read quota file info header "
 694                         "(type=%d)\n", type);
 695                 goto out_err;
 696         }
 697         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 698                                                 OCFS2_LOCAL_INFO_OFF);
 699         info->dqi_flags = le32_to_cpu(ldinfo->dqi_flags);
 700         oinfo->dqi_chunks = le32_to_cpu(ldinfo->dqi_chunks);
 701         oinfo->dqi_blocks = le32_to_cpu(ldinfo->dqi_blocks);
 702         oinfo->dqi_ibh = bh;
 703
 704         /* We crashed when using local quota file? */
 705         if (!(info->dqi_flags & OLQF_CLEAN)) {
 706                 rec = OCFS2_SB(sb)->quota_rec;
 707                 if (!rec) {
 708                         rec = ocfs2_alloc_quota_recovery();
 709                         if (!rec) {
 710                                 status = -ENOMEM;
 711                                 mlog_errno(status);
 712                                 goto out_err;
 713                         }
 714                         OCFS2_SB(sb)->quota_rec = rec;
 715                 }
 716
 717                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 718                                                    &rec->r_list[type]);
 719                 if (status < 0) {
 720                         mlog_errno(status);
 721                         goto out_err;
 722                 }
 723         }
 724
 725         status = ocfs2_load_local_quota_bitmaps(lqinode,
 726                                                 ldinfo,
 727                                                 &oinfo->dqi_chunk);
 728         if (status < 0) {
 729                 mlog_errno(status);
 730                 goto out_err;
 731         }
 732
 733         /* Now mark quota file as used */
 734         info->dqi_flags &= ~OLQF_CLEAN;
 735         status = ocfs2_modify_bh(lqinode, bh, olq_update_info, info);
 736         if (status < 0) {
 737                 mlog_errno(status);
 738                 goto out_err;
 739         }
 740
 741         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 742         return 0;
 743 out_err:
 744         if (oinfo) {
 745                 iput(oinfo->dqi_gqinode);
 746                 ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 747                 ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 748                 brelse(oinfo->dqi_lqi_bh);
 749                 if (locked)
 750                         ocfs2_inode_unlock(lqinode, 1);
 751                 ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 752                 kfree(oinfo);
 753         }
 754         brelse(bh);
 755         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 756         return -1;
 757 }
 758
 759 /* Write local info to quota file */
 760 static int ocfs2_local_write_info(struct super_block *sb, int type)
 761 {
 762         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 763         struct buffer_head *bh = ((struct ocfs2_mem_dqinfo *)info->dqi_priv)
 764                                                 ->dqi_ibh;
 765         int status;
 766
 767         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type], bh, olq_update_info,
 768                                  info);
 769         if (status < 0) {
 770                 mlog_errno(status);
 771                 return -1;
 772         }
 773
 774         return 0;
 775 }
 776
 777 /* Release info from memory */
 778 static int ocfs2_local_free_info(struct super_block *sb, int type)
 779 {
 780         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 781         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 782         struct ocfs2_quota_chunk *chunk;
 783         struct ocfs2_local_disk_chunk *dchunk;
 784         int mark_clean = 1, len;
 785         int status;
 786
 787         /* At this point we know there are no more dquots and thus
 788          * even if there's some sync in the pdflush queue, it won't
 789          * find any dquots and return without doing anything */
 790         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 791         iput(oinfo->dqi_gqinode);
 792         ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 793         ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 794         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 795                 dchunk = (struct ocfs2_local_disk_chunk *)
 796                                         (chunk->qc_headerbh->b_data);
 797                 if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 798                         len = ol_chunk_entries(sb);
 799                 } else {
 800                         len = (oinfo->dqi_blocks -
 801                                ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 802                               * ol_quota_entries_per_block(sb);
 803                 }
 804                 /* Not all entries free? Bug! */
 805                 if (le32_to_cpu(dchunk->dqc_free) != len) {
 806                         mlog(ML_ERROR, "releasing quota file with used "
 807                                         "entries (type=%d)\n", type);
 808                         mark_clean = 0;
 809                 }
 810         }
 811         ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 812
 813         /* dqonoff_mutex protects us against racing with recovery thread... */
 814         if (oinfo->dqi_rec) {
 815                 ocfs2_free_quota_recovery(oinfo->dqi_rec);
 816                 mark_clean = 0;
 817         }
 818
 819         if (!mark_clean)
 820                 goto out;
 821
 822         /* Mark local file as clean */
 823         info->dqi_flags |= OLQF_CLEAN;
 824         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type],
 825                                  oinfo->dqi_ibh,
 826                                  olq_update_info,
 827                                  info);
 828         if (status < 0) {
 829                 mlog_errno(status);
 830                 goto out;
 831         }
 832
 833 out:
 834         ocfs2_inode_unlock(sb_dqopt(sb)->files[type], 1);
 835         brelse(oinfo->dqi_ibh);
 836         brelse(oinfo->dqi_lqi_bh);
 837         kfree(oinfo);
 838         return 0;
 839 }
 840
 841 static void olq_set_dquot(struct buffer_head *bh, void *private)
 842 {
 843         struct ocfs2_dquot *od = private;
 844         struct ocfs2_local_disk_dqblk *dqblk;
 845         struct super_block *sb = od->dq_dquot.dq_sb;
 846
 847         dqblk = (struct ocfs2_local_disk_dqblk *)(bh->b_data
 848                 + ol_dqblk_block_offset(sb, od->dq_local_off));
 849
 850         dqblk->dqb_id = cpu_to_le64(od->dq_dquot.dq_id);
 851         spin_lock(&dq_data_lock);
 852         dqblk->dqb_spacemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curspace -
 853                                           od->dq_origspace);
 854         dqblk->dqb_inodemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curinodes -
 855                                           od->dq_originodes);
 856         spin_unlock(&dq_data_lock);
 857         mlog(0, "Writing local dquot %u space %lld inodes %lld\n",
 858              od->dq_dquot.dq_id, (long long)le64_to_cpu(dqblk->dqb_spacemod),
 859              (long long)le64_to_cpu(dqblk->dqb_inodemod));
 860 }
 861
 862 /* Write dquot to local quota file */
 863 static int ocfs2_local_write_dquot(struct dquot *dquot)
 864 {
 865         struct super_block *sb = dquot->dq_sb;
 866         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
 867         struct buffer_head *bh = NULL;
 868         int status;
 869
 870         status = ocfs2_read_quota_block(sb_dqopt(sb)->files[dquot->dq_type],
 871                                     ol_dqblk_file_block(sb, od->dq_local_off),
 872                                     &bh);
 873         if (status) {
 874                 mlog_errno(status);
 875                 goto out;
 876         }
 877         status = ocfs2_modify_bh(sb_dqopt(sb)->files[dquot->dq_type], bh,
 878                                  olq_set_dquot, od);
 879         if (status < 0) {
 880                 mlog_errno(status);
 881                 goto out;
 882         }
 883 out:
 884         brelse(bh);
 885         return status;
 886 }
 887
 888 /* Find free entry in local quota file */
 889 static struct ocfs2_quota_chunk *ocfs2_find_free_entry(struct super_block *sb,
 890                                                        int type,
 891                                                        int *offset)
 892 {
 893         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 894         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 895         struct ocfs2_quota_chunk *chunk;
 896         struct ocfs2_local_disk_chunk *dchunk;
 897         int found = 0, len;
 898
 899         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 900                 dchunk = (struct ocfs2_local_disk_chunk *)
 901                                                 chunk->qc_headerbh->b_data;
 902                 if (le32_to_cpu(dchunk->dqc_free) > 0) {
 903                         found = 1;
 904                         break;
 905                 }
 906         }
 907         if (!found)
 908                 return NULL;
 909
 910         if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 911                 len = ol_chunk_entries(sb);
 912         } else {
 913                 len = (oinfo->dqi_blocks -
 914                        ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 915                       * ol_quota_entries_per_block(sb);
 916         }
 917
 918         found = ocfs2_find_next_zero_bit(dchunk->dqc_bitmap, len, 0);
 919         /* We failed? */
 920         if (found == len) {
 921                 mlog(ML_ERROR, "Did not find empty entry in chunk %d with %u"
 922                      " entries free (type=%d)\n", chunk->qc_num,
 923                      le32_to_cpu(dchunk->dqc_free), type);
 924                 return ERR_PTR(-EIO);
 925         }
 926         *offset = found;
 927         return chunk;
 928 }
 929
 930 /* Add new chunk to the local quota file */
 931 static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
 932                                                         struct super_block *sb,
 933                                                         int type,
 934                                                         int *offset)
 935 {
 936         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 937         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 938         struct inode *lqinode = sb_dqopt(sb)->files[type];
 939         struct ocfs2_quota_chunk *chunk = NULL;
 940         struct ocfs2_local_disk_chunk *dchunk;
 941         int status;
 942         handle_t *handle;
 943         struct buffer_head *bh = NULL;
 944         u64 p_blkno;
 945
 946         /* We are protected by dqio_sem so no locking needed */
 947         status = ocfs2_extend_no_holes(lqinode,
 948                                        lqinode->i_size + 2 * sb->s_blocksize,
 949                                        lqinode->i_size);
 950         if (status < 0) {
 951                 mlog_errno(status);
 952                 goto out;
 953         }
 954         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
 955                                           lqinode->i_size + 2 * sb->s_blocksize);
 956         if (status < 0) {
 957                 mlog_errno(status);
 958                 goto out;
 959         }
 960
 961         chunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
 962         if (!chunk) {
 963                 status = -ENOMEM;
 964                 mlog_errno(status);
 965                 goto out;
 966         }
 967
 968         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
 969         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
 970                                              &p_blkno, NULL, NULL);
 971         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
 972         if (status < 0) {
 973                 mlog_errno(status);
 974                 goto out;
 975         }
 976         bh = sb_getblk(sb, p_blkno);
 977         if (!bh) {
 978                 status = -ENOMEM;
 979                 mlog_errno(status);
 980                 goto out;
 981         }
 982         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
 983
 984         handle = ocfs2_start_trans(OCFS2_SB(sb), 2);
 985         if (IS_ERR(handle)) {
 986                 status = PTR_ERR(handle);
 987                 mlog_errno(status);
 988                 goto out;
 989         }
 990
 991         status = ocfs2_journal_access_dq(handle, lqinode, bh,
 992                                          OCFS2_JOURNAL_ACCESS_WRITE);
 993         if (status < 0) {
 994                 mlog_errno(status);
 995                 goto out_trans;
 996         }
 997         lock_buffer(bh);
 998         dchunk->dqc_free = cpu_to_le32(ol_quota_entries_per_block(sb));
 999         memset(dchunk->dqc_bitmap, 0,
1000                sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
1001                OCFS2_QBLK_RESERVED_SPACE);
1002         set_buffer_uptodate(bh);
1003         unlock_buffer(bh);
1004         status = ocfs2_journal_dirty(handle, bh);
1005         if (status < 0) {
1006                 mlog_errno(status);
1007                 goto out_trans;
1008         }
1009
1010         oinfo->dqi_blocks += 2;
1011         oinfo->dqi_chunks++;
1012         status = ocfs2_local_write_info(sb, type);
1013         if (status < 0) {
1014                 mlog_errno(status);
1015                 goto out_trans;
1016         }
1017         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1018         if (status < 0) {
1019                 mlog_errno(status);
1020                 goto out;
1021         }
1022
1023         list_add_tail(&chunk->qc_chunk, &oinfo->dqi_chunk);
1024         chunk->qc_num = list_entry(chunk->qc_chunk.prev,
1025                                    struct ocfs2_quota_chunk,
1026                                    qc_chunk)->qc_num + 1;
1027         chunk->qc_headerbh = bh;
1028         *offset = 0;
1029         return chunk;
1030 out_trans:
1031         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1032 out:
1033         brelse(bh);
1034         kmem_cache_free(ocfs2_qf_chunk_cachep, chunk);
1035         return ERR_PTR(status);
1036 }
1037
1038 /* Find free entry in local quota file */
1039 static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
1040                                                        struct super_block *sb,
1041                                                        int type,
1042                                                        int *offset)
1043 {
1044         struct mem_dqinfo *info = sb_dqinfo(sb, type);
1045         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
1046         struct ocfs2_quota_chunk *chunk;
1047         struct inode *lqinode = sb_dqopt(sb)->files[type];
1048         struct ocfs2_local_disk_chunk *dchunk;
1049         int epb = ol_quota_entries_per_block(sb);
1050         unsigned int chunk_blocks;
1051         int status;
1052         handle_t *handle;
1053
1054         if (list_empty(&oinfo->dqi_chunk))
1055                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1056         /* Is the last chunk full? */
1057         chunk = list_entry(oinfo->dqi_chunk.prev,
1058                         struct ocfs2_quota_chunk, qc_chunk);
1059         chunk_blocks = oinfo->dqi_blocks -
1060                         ol_quota_chunk_block(sb, chunk->qc_num) - 1;
1061         if (ol_chunk_blocks(sb) == chunk_blocks)
1062                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1063
1064         /* We are protected by dqio_sem so no locking needed */
1065         status = ocfs2_extend_no_holes(lqinode,
1066                                        lqinode->i_size + sb->s_blocksize,
1067                                        lqinode->i_size);
1068         if (status < 0) {
1069                 mlog_errno(status);
1070                 goto out;
1071         }
1072         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
1073                                           lqinode->i_size + sb->s_blocksize);
1074         if (status < 0) {
1075                 mlog_errno(status);
1076                 goto out;
1077         }
1078         handle = ocfs2_start_trans(OCFS2_SB(sb), 2);
1079         if (IS_ERR(handle)) {
1080                 status = PTR_ERR(handle);
1081                 mlog_errno(status);
1082                 goto out;
1083         }
1084         status = ocfs2_journal_access_dq(handle, lqinode, chunk->qc_headerbh,
1085                                  OCFS2_JOURNAL_ACCESS_WRITE);
1086         if (status < 0) {
1087                 mlog_errno(status);
1088                 goto out_trans;
1089         }
1090
1091         dchunk = (struct ocfs2_local_disk_chunk *)chunk->qc_headerbh->b_data;
1092         lock_buffer(chunk->qc_headerbh);
1093         le32_add_cpu(&dchunk->dqc_free, ol_quota_entries_per_block(sb));
1094         unlock_buffer(chunk->qc_headerbh);
1095         status = ocfs2_journal_dirty(handle, chunk->qc_headerbh);
1096         if (status < 0) {
1097                 mlog_errno(status);
1098                 goto out_trans;
1099         }
1100         oinfo->dqi_blocks++;
1101         status = ocfs2_local_write_info(sb, type);
1102         if (status < 0) {
1103                 mlog_errno(status);
1104                 goto out_trans;
1105         }
1106
1107         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1108         if (status < 0) {
1109                 mlog_errno(status);
1110                 goto out;
1111         }
1112         *offset = chunk_blocks * epb;
1113         return chunk;
1114 out_trans:
1115         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1116 out:
1117         return ERR_PTR(status);
1118 }
1119
1120 static void olq_alloc_dquot(struct buffer_head *bh, void *private)
1121 {
1122         int *offset = private;
1123         struct ocfs2_local_disk_chunk *dchunk;
1124
1125         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
1126         ocfs2_set_bit(*offset, dchunk->dqc_bitmap);
1127         le32_add_cpu(&dchunk->dqc_free, -1);
1128 }
1129
1130 /* Create dquot in the local file for given id */
1131 static int ocfs2_create_local_dquot(struct dquot *dquot)
1132 {
1133         struct super_block *sb = dquot->dq_sb;
1134         int type = dquot->dq_type;
1135         struct inode *lqinode = sb_dqopt(sb)->files[type];
1136         struct ocfs2_quota_chunk *chunk;
1137         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1138         int offset;
1139         int status;
1140
1141         chunk = ocfs2_find_free_entry(sb, type, &offset);
1142         if (!chunk) {
1143                 chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
1144                 if (IS_ERR(chunk))
1145                         return PTR_ERR(chunk);
1146         } else if (IS_ERR(chunk)) {
1147                 return PTR_ERR(chunk);
1148         }
1149         od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
1150         od->dq_chunk = chunk;
1151
1152         /* Initialize dquot structure on disk */
1153         status = ocfs2_local_write_dquot(dquot);
1154         if (status < 0) {
1155                 mlog_errno(status);
1156                 goto out;
1157         }
1158
1159         /* Mark structure as allocated */
1160         status = ocfs2_modify_bh(lqinode, chunk->qc_headerbh, olq_alloc_dquot,
1161                                  &offset);
1162         if (status < 0) {
1163                 mlog_errno(status);
1164                 goto out;
1165         }
1166 out:
1167         return status;
1168 }
1169
1170 /* Create entry in local file for dquot, load data from the global file */
1171 static int ocfs2_local_read_dquot(struct dquot *dquot)
1172 {
1173         int status;
1174
1175         mlog_entry("id=%u, type=%d\n", dquot->dq_id, dquot->dq_type);
1176
1177         status = ocfs2_global_read_dquot(dquot);
1178         if (status < 0) {
1179                 mlog_errno(status);
1180                 goto out_err;
1181         }
1182
1183         /* Now create entry in the local quota file */
1184         status = ocfs2_create_local_dquot(dquot);
1185         if (status < 0) {
1186                 mlog_errno(status);
1187                 goto out_err;
1188         }
1189         mlog_exit(0);
1190         return 0;
1191 out_err:
1192         mlog_exit(status);
1193         return status;
1194 }
1195
1196 /* Release dquot structure from local quota file. ocfs2_release_dquot() has
1197  * already started a transaction and obtained exclusive lock for global
1198  * quota file. */
1199 static int ocfs2_local_release_dquot(struct dquot *dquot)
1200 {
1201         int status;
1202         int type = dquot->dq_type;
1203         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1204         struct super_block *sb = dquot->dq_sb;
1205         struct ocfs2_local_disk_chunk *dchunk;
1206         int offset;
1207         handle_t *handle = journal_current_handle();
1208
1209         BUG_ON(!handle);
1210         /* First write all local changes to global file */
1211         status = ocfs2_global_release_dquot(dquot);
1212         if (status < 0) {
1213                 mlog_errno(status);
1214                 goto out;
1215         }
1216
1217         status = ocfs2_journal_access_dq(handle, sb_dqopt(sb)->files[type],
1218                         od->dq_chunk->qc_headerbh, OCFS2_JOURNAL_ACCESS_WRITE);
1219         if (status < 0) {
1220                 mlog_errno(status);
1221                 goto out;
1222         }
1223         offset = ol_dqblk_chunk_off(sb, od->dq_chunk->qc_num,
1224                                              od->dq_local_off);
1225         dchunk = (struct ocfs2_local_disk_chunk *)
1226                         (od->dq_chunk->qc_headerbh->b_data);
1227         /* Mark structure as freed */
1228         lock_buffer(od->dq_chunk->qc_headerbh);
1229         ocfs2_clear_bit(offset, dchunk->dqc_bitmap);
1230         le32_add_cpu(&dchunk->dqc_free, 1);
1231         unlock_buffer(od->dq_chunk->qc_headerbh);
1232         status = ocfs2_journal_dirty(handle, od->dq_chunk->qc_headerbh);
1233         if (status < 0) {
1234                 mlog_errno(status);
1235                 goto out;
1236         }
1237         status = 0;
1238 out:
1239         /* Clear the read bit so that next time someone uses this
1240          * dquot he reads fresh info from disk and allocates local
1241          * dquot structure */
1242         clear_bit(DQ_READ_B, &dquot->dq_flags);
1243         return status;
1244 }
1245
1246 static struct quota_format_ops ocfs2_format_ops = {
1247         .check_quota_file       = ocfs2_local_check_quota_file,
1248         .read_file_info         = ocfs2_local_read_info,
1249         .write_file_info        = ocfs2_global_write_info,
1250         .free_file_info         = ocfs2_local_free_info,
1251         .read_dqblk             = ocfs2_local_read_dquot,
1252         .commit_dqblk           = ocfs2_local_write_dquot,
1253         .release_dqblk          = ocfs2_local_release_dquot,
1254 };
1255
1256 struct quota_format_type ocfs2_quota_format = {
1257         .qf_fmt_id = QFMT_OCFS2,
1258         .qf_ops = &ocfs2_format_ops,
1259         .qf_owner = THIS_MODULE
1260 };