SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 #include "uptodate.h"
  24
  25 /* Number of local quota structures per block */
  26 static inline unsigned int ol_quota_entries_per_block(struct super_block *sb)
  27 {
  28         return ((sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) /
  29                 sizeof(struct ocfs2_local_disk_dqblk));
  30 }
  31
  32 /* Number of blocks with entries in one chunk */
  33 static inline unsigned int ol_chunk_blocks(struct super_block *sb)
  34 {
  35         return ((sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
  36                  OCFS2_QBLK_RESERVED_SPACE) << 3) /
  37                ol_quota_entries_per_block(sb);
  38 }
  39
  40 /* Number of entries in a chunk bitmap */
  41 static unsigned int ol_chunk_entries(struct super_block *sb)
  42 {
  43         return ol_chunk_blocks(sb) * ol_quota_entries_per_block(sb);
  44 }
  45
  46 /* Offset of the chunk in quota file */
  47 static unsigned int ol_quota_chunk_block(struct super_block *sb, int c)
  48 {
  49         /* 1 block for local quota file info, 1 block per chunk for chunk info */
  50         return 1 + (ol_chunk_blocks(sb) + 1) * c;
  51 }
  52
  53 static unsigned int ol_dqblk_block(struct super_block *sb, int c, int off)
  54 {
  55         int epb = ol_quota_entries_per_block(sb);
  56
  57         return ol_quota_chunk_block(sb, c) + 1 + off / epb;
  58 }
  59
  60 static unsigned int ol_dqblk_block_off(struct super_block *sb, int c, int off)
  61 {
  62         int epb = ol_quota_entries_per_block(sb);
  63
  64         return (off % epb) * sizeof(struct ocfs2_local_disk_dqblk);
  65 }
  66
  67 /* Offset of the dquot structure in the quota file */
  68 static loff_t ol_dqblk_off(struct super_block *sb, int c, int off)
  69 {
  70         return (ol_dqblk_block(sb, c, off) << sb->s_blocksize_bits) +
  71                ol_dqblk_block_off(sb, c, off);
  72 }
  73
  74 /* Compute block number from given offset */
  75 static inline unsigned int ol_dqblk_file_block(struct super_block *sb, loff_t off)
  76 {
  77         return off >> sb->s_blocksize_bits;
  78 }
  79
  80 static inline unsigned int ol_dqblk_block_offset(struct super_block *sb, loff_t off)
  81 {
  82         return off & ((1 << sb->s_blocksize_bits) - 1);
  83 }
  84
  85 /* Compute offset in the chunk of a structure with the given offset */
  86 static int ol_dqblk_chunk_off(struct super_block *sb, int c, loff_t off)
  87 {
  88         int epb = ol_quota_entries_per_block(sb);
  89
  90         return ((off >> sb->s_blocksize_bits) -
  91                         ol_quota_chunk_block(sb, c) - 1) * epb
  92                + ((unsigned int)(off & ((1 << sb->s_blocksize_bits) - 1))) /
  93                  sizeof(struct ocfs2_local_disk_dqblk);
  94 }
  95
  96 /* Write bufferhead into the fs */
  97 static int ocfs2_modify_bh(struct inode *inode, struct buffer_head *bh,
  98                 void (*modify)(struct buffer_head *, void *), void *private)
  99 {
 100         struct super_block *sb = inode->i_sb;
 101         handle_t *handle;
 102         int status;
 103
 104         handle = ocfs2_start_trans(OCFS2_SB(sb),
 105                                    OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
 106         if (IS_ERR(handle)) {
 107                 status = PTR_ERR(handle);
 108                 mlog_errno(status);
 109                 return status;
 110         }
 111         status = ocfs2_journal_access_dq(handle, INODE_CACHE(inode), bh,
 112                                          OCFS2_JOURNAL_ACCESS_WRITE);
 113         if (status < 0) {
 114                 mlog_errno(status);
 115                 ocfs2_commit_trans(OCFS2_SB(sb), handle);
 116                 return status;
 117         }
 118         lock_buffer(bh);
 119         modify(bh, private);
 120         unlock_buffer(bh);
 121         ocfs2_journal_dirty(handle, bh);
 122
 123         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
 124         if (status < 0) {
 125                 mlog_errno(status);
 126                 return status;
 127         }
 128         return 0;
 129 }
 130
 131 /* Check whether we understand format of quota files */
 132 static int ocfs2_local_check_quota_file(struct super_block *sb, int type)
 133 {
 134         unsigned int lmagics[MAXQUOTAS] = OCFS2_LOCAL_QMAGICS;
 135         unsigned int lversions[MAXQUOTAS] = OCFS2_LOCAL_QVERSIONS;
 136         unsigned int gmagics[MAXQUOTAS] = OCFS2_GLOBAL_QMAGICS;
 137         unsigned int gversions[MAXQUOTAS] = OCFS2_GLOBAL_QVERSIONS;
 138         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 139                                         GROUP_QUOTA_SYSTEM_INODE };
 140         struct buffer_head *bh = NULL;
 141         struct inode *linode = sb_dqopt(sb)->files[type];
 142         struct inode *ginode = NULL;
 143         struct ocfs2_disk_dqheader *dqhead;
 144         int status, ret = 0;
 145
 146         /* First check whether we understand local quota file */
 147         status = ocfs2_read_quota_block(linode, 0, &bh);
 148         if (status) {
 149                 mlog_errno(status);
 150                 mlog(ML_ERROR, "failed to read quota file header (type=%d)\n",
 151                         type);
 152                 goto out_err;
 153         }
 154         dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
 155         if (le32_to_cpu(dqhead->dqh_magic) != lmagics[type]) {
 156                 mlog(ML_ERROR, "quota file magic does not match (%u != %u),"
 157                         " type=%d\n", le32_to_cpu(dqhead->dqh_magic),
 158                         lmagics[type], type);
 159                 goto out_err;
 160         }
 161         if (le32_to_cpu(dqhead->dqh_version) != lversions[type]) {
 162                 mlog(ML_ERROR, "quota file version does not match (%u != %u),"
 163                         " type=%d\n", le32_to_cpu(dqhead->dqh_version),
 164                         lversions[type], type);
 165                 goto out_err;
 166         }
 167         brelse(bh);
 168         bh = NULL;
 169
 170         /* Next check whether we understand global quota file */
 171         ginode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 172                                                 OCFS2_INVALID_SLOT);
 173         if (!ginode) {
 174                 mlog(ML_ERROR, "cannot get global quota file inode "
 175                                 "(type=%d)\n", type);
 176                 goto out_err;
 177         }
 178         /* Since the header is read only, we don't care about locking */
 179         status = ocfs2_read_quota_block(ginode, 0, &bh);
 180         if (status) {
 181                 mlog_errno(status);
 182                 mlog(ML_ERROR, "failed to read global quota file header "
 183                                 "(type=%d)\n", type);
 184                 goto out_err;
 185         }
 186         dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
 187         if (le32_to_cpu(dqhead->dqh_magic) != gmagics[type]) {
 188                 mlog(ML_ERROR, "global quota file magic does not match "
 189                         "(%u != %u), type=%d\n",
 190                         le32_to_cpu(dqhead->dqh_magic), gmagics[type], type);
 191                 goto out_err;
 192         }
 193         if (le32_to_cpu(dqhead->dqh_version) != gversions[type]) {
 194                 mlog(ML_ERROR, "global quota file version does not match "
 195                         "(%u != %u), type=%d\n",
 196                         le32_to_cpu(dqhead->dqh_version), gversions[type],
 197                         type);
 198                 goto out_err;
 199         }
 200
 201         ret = 1;
 202 out_err:
 203         brelse(bh);
 204         iput(ginode);
 205         return ret;
 206 }
 207
 208 /* Release given list of quota file chunks */
 209 static void ocfs2_release_local_quota_bitmaps(struct list_head *head)
 210 {
 211         struct ocfs2_quota_chunk *pos, *next;
 212
 213         list_for_each_entry_safe(pos, next, head, qc_chunk) {
 214                 list_del(&pos->qc_chunk);
 215                 brelse(pos->qc_headerbh);
 216                 kmem_cache_free(ocfs2_qf_chunk_cachep, pos);
 217         }
 218 }
 219
 220 /* Load quota bitmaps into memory */
 221 static int ocfs2_load_local_quota_bitmaps(struct inode *inode,
 222                         struct ocfs2_local_disk_dqinfo *ldinfo,
 223                         struct list_head *head)
 224 {
 225         struct ocfs2_quota_chunk *newchunk;
 226         int i, status;
 227
 228         INIT_LIST_HEAD(head);
 229         for (i = 0; i < le32_to_cpu(ldinfo->dqi_chunks); i++) {
 230                 newchunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
 231                 if (!newchunk) {
 232                         ocfs2_release_local_quota_bitmaps(head);
 233                         return -ENOMEM;
 234                 }
 235                 newchunk->qc_num = i;
 236                 newchunk->qc_headerbh = NULL;
 237                 status = ocfs2_read_quota_block(inode,
 238                                 ol_quota_chunk_block(inode->i_sb, i),
 239                                 &newchunk->qc_headerbh);
 240                 if (status) {
 241                         mlog_errno(status);
 242                         kmem_cache_free(ocfs2_qf_chunk_cachep, newchunk);
 243                         ocfs2_release_local_quota_bitmaps(head);
 244                         return status;
 245                 }
 246                 list_add_tail(&newchunk->qc_chunk, head);
 247         }
 248         return 0;
 249 }
 250
 251 static void olq_update_info(struct buffer_head *bh, void *private)
 252 {
 253         struct mem_dqinfo *info = private;
 254         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 255         struct ocfs2_local_disk_dqinfo *ldinfo;
 256
 257         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 258                                                 OCFS2_LOCAL_INFO_OFF);
 259         spin_lock(&dq_data_lock);
 260         ldinfo->dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
 261         ldinfo->dqi_chunks = cpu_to_le32(oinfo->dqi_chunks);
 262         ldinfo->dqi_blocks = cpu_to_le32(oinfo->dqi_blocks);
 263         spin_unlock(&dq_data_lock);
 264 }
 265
 266 static int ocfs2_add_recovery_chunk(struct super_block *sb,
 267                                     struct ocfs2_local_disk_chunk *dchunk,
 268                                     int chunk,
 269                                     struct list_head *head)
 270 {
 271         struct ocfs2_recovery_chunk *rc;
 272
 273         rc = kmalloc(sizeof(struct ocfs2_recovery_chunk), GFP_NOFS);
 274         if (!rc)
 275                 return -ENOMEM;
 276         rc->rc_chunk = chunk;
 277         rc->rc_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
 278         if (!rc->rc_bitmap) {
 279                 kfree(rc);
 280                 return -ENOMEM;
 281         }
 282         memcpy(rc->rc_bitmap, dchunk->dqc_bitmap,
 283                (ol_chunk_entries(sb) + 7) >> 3);
 284         list_add_tail(&rc->rc_list, head);
 285         return 0;
 286 }
 287
 288 static void free_recovery_list(struct list_head *head)
 289 {
 290         struct ocfs2_recovery_chunk *next;
 291         struct ocfs2_recovery_chunk *rchunk;
 292
 293         list_for_each_entry_safe(rchunk, next, head, rc_list) {
 294                 list_del(&rchunk->rc_list);
 295                 kfree(rchunk->rc_bitmap);
 296                 kfree(rchunk);
 297         }
 298 }
 299
 300 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec)
 301 {
 302         int type;
 303
 304         for (type = 0; type < MAXQUOTAS; type++)
 305                 free_recovery_list(&(rec->r_list[type]));
 306         kfree(rec);
 307 }
 308
 309 /* Load entries in our quota file we have to recover*/
 310 static int ocfs2_recovery_load_quota(struct inode *lqinode,
 311                                      struct ocfs2_local_disk_dqinfo *ldinfo,
 312                                      int type,
 313                                      struct list_head *head)
 314 {
 315         struct super_block *sb = lqinode->i_sb;
 316         struct buffer_head *hbh;
 317         struct ocfs2_local_disk_chunk *dchunk;
 318         int i, chunks = le32_to_cpu(ldinfo->dqi_chunks);
 319         int status = 0;
 320
 321         for (i = 0; i < chunks; i++) {
 322                 hbh = NULL;
 323                 status = ocfs2_read_quota_block(lqinode,
 324                                                 ol_quota_chunk_block(sb, i),
 325                                                 &hbh);
 326                 if (status) {
 327                         mlog_errno(status);
 328                         break;
 329                 }
 330                 dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
 331                 if (le32_to_cpu(dchunk->dqc_free) < ol_chunk_entries(sb))
 332                         status = ocfs2_add_recovery_chunk(sb, dchunk, i, head);
 333                 brelse(hbh);
 334                 if (status < 0)
 335                         break;
 336         }
 337         if (status < 0)
 338                 free_recovery_list(head);
 339         return status;
 340 }
 341
 342 static struct ocfs2_quota_recovery *ocfs2_alloc_quota_recovery(void)
 343 {
 344         int type;
 345         struct ocfs2_quota_recovery *rec;
 346
 347         rec = kmalloc(sizeof(struct ocfs2_quota_recovery), GFP_NOFS);
 348         if (!rec)
 349                 return NULL;
 350         for (type = 0; type < MAXQUOTAS; type++)
 351                 INIT_LIST_HEAD(&(rec->r_list[type]));
 352         return rec;
 353 }
 354
 355 /* Load information we need for quota recovery into memory */
 356 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
 357                                                 struct ocfs2_super *osb,
 358                                                 int slot_num)
 359 {
 360         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 361                                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 362         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 363                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 364         struct super_block *sb = osb->sb;
 365         struct ocfs2_local_disk_dqinfo *ldinfo;
 366         struct inode *lqinode;
 367         struct buffer_head *bh;
 368         int type;
 369         int status = 0;
 370         struct ocfs2_quota_recovery *rec;
 371
 372         mlog(ML_NOTICE, "Beginning quota recovery in slot %u\n", slot_num);
 373         rec = ocfs2_alloc_quota_recovery();
 374         if (!rec)
 375                 return ERR_PTR(-ENOMEM);
 376         /* First init... */
 377
 378         for (type = 0; type < MAXQUOTAS; type++) {
 379                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 380                         continue;
 381                 /* At this point, journal of the slot is already replayed so
 382                  * we can trust metadata and data of the quota file */
 383                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
 384                 if (!lqinode) {
 385                         status = -ENOENT;
 386                         goto out;
 387                 }
 388                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
 389                                                OCFS2_META_LOCK_RECOVERY);
 390                 if (status < 0) {
 391                         mlog_errno(status);
 392                         goto out_put;
 393                 }
 394                 /* Now read local header */
 395                 bh = NULL;
 396                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
 397                 if (status) {
 398                         mlog_errno(status);
 399                         mlog(ML_ERROR, "failed to read quota file info header "
 400                                 "(slot=%d type=%d)\n", slot_num, type);
 401                         goto out_lock;
 402                 }
 403                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 404                                                         OCFS2_LOCAL_INFO_OFF);
 405                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 406                                                    &rec->r_list[type]);
 407                 brelse(bh);
 408 out_lock:
 409                 ocfs2_inode_unlock(lqinode, 1);
 410 out_put:
 411                 iput(lqinode);
 412                 if (status < 0)
 413                         break;
 414         }
 415 out:
 416         if (status < 0) {
 417                 ocfs2_free_quota_recovery(rec);
 418                 rec = ERR_PTR(status);
 419         }
 420         return rec;
 421 }
 422
 423 /* Sync changes in local quota file into global quota file and
 424  * reinitialize local quota file.
 425  * The function expects local quota file to be already locked and
 426  * dqonoff_mutex locked. */
 427 static int ocfs2_recover_local_quota_file(struct inode *lqinode,
 428                                           int type,
 429                                           struct ocfs2_quota_recovery *rec)
 430 {
 431         struct super_block *sb = lqinode->i_sb;
 432         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 433         struct ocfs2_local_disk_chunk *dchunk;
 434         struct ocfs2_local_disk_dqblk *dqblk;
 435         struct dquot *dquot;
 436         handle_t *handle;
 437         struct buffer_head *hbh = NULL, *qbh = NULL;
 438         int status = 0;
 439         int bit, chunk;
 440         struct ocfs2_recovery_chunk *rchunk, *next;
 441         qsize_t spacechange, inodechange;
 442
 443         mlog_entry("ino=%lu type=%u", (unsigned long)lqinode->i_ino, type);
 444
 445         list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
 446                 chunk = rchunk->rc_chunk;
 447                 hbh = NULL;
 448                 status = ocfs2_read_quota_block(lqinode,
 449                                                 ol_quota_chunk_block(sb, chunk),
 450                                                 &hbh);
 451                 if (status) {
 452                         mlog_errno(status);
 453                         break;
 454                 }
 455                 dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
 456                 for_each_set_bit(bit, rchunk->rc_bitmap, ol_chunk_entries(sb)) {
 457                         qbh = NULL;
 458                         status = ocfs2_read_quota_block(lqinode,
 459                                                 ol_dqblk_block(sb, chunk, bit),
 460                                                 &qbh);
 461                         if (status) {
 462                                 mlog_errno(status);
 463                                 break;
 464                         }
 465                         dqblk = (struct ocfs2_local_disk_dqblk *)(qbh->b_data +
 466                                 ol_dqblk_block_off(sb, chunk, bit));
 467                         dquot = dqget(sb, le64_to_cpu(dqblk->dqb_id), type);
 468                         if (!dquot) {
 469                                 status = -EIO;
 470                                 mlog(ML_ERROR, "Failed to get quota structure "
 471                                      "for id %u, type %d. Cannot finish quota "
 472                                      "file recovery.\n",
 473                                      (unsigned)le64_to_cpu(dqblk->dqb_id),
 474                                      type);
 475                                 goto out_put_bh;
 476                         }
 477                         status = ocfs2_lock_global_qf(oinfo, 1);
 478                         if (status < 0) {
 479                                 mlog_errno(status);
 480                                 goto out_put_dquot;
 481                         }
 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_drop_lock;
 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,
 510                                         INODE_CACHE(lqinode),
 511                                         qbh, OCFS2_JOURNAL_ACCESS_WRITE);
 512                         if (status < 0) {
 513                                 mlog_errno(status);
 514                                 goto out_commit;
 515                         }
 516                         lock_buffer(qbh);
 517                         WARN_ON(!ocfs2_test_bit(bit, dchunk->dqc_bitmap));
 518                         ocfs2_clear_bit(bit, dchunk->dqc_bitmap);
 519                         le32_add_cpu(&dchunk->dqc_free, 1);
 520                         unlock_buffer(qbh);
 521                         ocfs2_journal_dirty(handle, qbh);
 522 out_commit:
 523                         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 524                         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 525 out_drop_lock:
 526                         ocfs2_unlock_global_qf(oinfo, 1);
 527 out_put_dquot:
 528                         dqput(dquot);
 529 out_put_bh:
 530                         brelse(qbh);
 531                         if (status < 0)
 532                                 break;
 533                 }
 534                 brelse(hbh);
 535                 list_del(&rchunk->rc_list);
 536                 kfree(rchunk->rc_bitmap);
 537                 kfree(rchunk);
 538                 if (status < 0)
 539                         break;
 540         }
 541         if (status < 0)
 542                 free_recovery_list(&(rec->r_list[type]));
 543         mlog_exit(status);
 544         return status;
 545 }
 546
 547 /* Recover local quota files for given node different from us */
 548 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
 549                                 struct ocfs2_quota_recovery *rec,
 550                                 int slot_num)
 551 {
 552         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 553                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 554         struct super_block *sb = osb->sb;
 555         struct ocfs2_local_disk_dqinfo *ldinfo;
 556         struct buffer_head *bh;
 557         handle_t *handle;
 558         int type;
 559         int status = 0;
 560         struct inode *lqinode;
 561         unsigned int flags;
 562
 563         mlog(ML_NOTICE, "Finishing quota recovery in slot %u\n", slot_num);
 564         mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
 565         for (type = 0; type < MAXQUOTAS; type++) {
 566                 if (list_empty(&(rec->r_list[type])))
 567                         continue;
 568                 mlog(0, "Recovering quota in slot %d\n", slot_num);
 569                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
 570                 if (!lqinode) {
 571                         status = -ENOENT;
 572                         goto out;
 573                 }
 574                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
 575                                                        OCFS2_META_LOCK_NOQUEUE);
 576                 /* Someone else is holding the lock? Then he must be
 577                  * doing the recovery. Just skip the file... */
 578                 if (status == -EAGAIN) {
 579                         mlog(ML_NOTICE, "skipping quota recovery for slot %d "
 580                              "because quota file is locked.\n", slot_num);
 581                         status = 0;
 582                         goto out_put;
 583                 } else if (status < 0) {
 584                         mlog_errno(status);
 585                         goto out_put;
 586                 }
 587                 /* Now read local header */
 588                 bh = NULL;
 589                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
 590                 if (status) {
 591                         mlog_errno(status);
 592                         mlog(ML_ERROR, "failed to read quota file info header "
 593                                 "(slot=%d type=%d)\n", slot_num, type);
 594                         goto out_lock;
 595                 }
 596                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 597                                                         OCFS2_LOCAL_INFO_OFF);
 598                 /* Is recovery still needed? */
 599                 flags = le32_to_cpu(ldinfo->dqi_flags);
 600                 if (!(flags & OLQF_CLEAN))
 601                         status = ocfs2_recover_local_quota_file(lqinode,
 602                                                                 type,
 603                                                                 rec);
 604                 /* We don't want to mark file as clean when it is actually
 605                  * active */
 606                 if (slot_num == osb->slot_num)
 607                         goto out_bh;
 608                 /* Mark quota file as clean if we are recovering quota file of
 609                  * some other node. */
 610                 handle = ocfs2_start_trans(osb,
 611                                            OCFS2_LOCAL_QINFO_WRITE_CREDITS);
 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, INODE_CACHE(lqinode),
 618                                                  bh,
 619                                                  OCFS2_JOURNAL_ACCESS_WRITE);
 620                 if (status < 0) {
 621                         mlog_errno(status);
 622                         goto out_trans;
 623                 }
 624                 lock_buffer(bh);
 625                 ldinfo->dqi_flags = cpu_to_le32(flags | OLQF_CLEAN);
 626                 unlock_buffer(bh);
 627                 ocfs2_journal_dirty(handle, bh);
 628 out_trans:
 629                 ocfs2_commit_trans(osb, handle);
 630 out_bh:
 631                 brelse(bh);
 632 out_lock:
 633                 ocfs2_inode_unlock(lqinode, 1);
 634 out_put:
 635                 iput(lqinode);
 636                 if (status < 0)
 637                         break;
 638         }
 639 out:
 640         mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 641         kfree(rec);
 642         return status;
 643 }
 644
 645 /* Read information header from quota file */
 646 static int ocfs2_local_read_info(struct super_block *sb, int type)
 647 {
 648         struct ocfs2_local_disk_dqinfo *ldinfo;
 649         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 650         struct ocfs2_mem_dqinfo *oinfo;
 651         struct inode *lqinode = sb_dqopt(sb)->files[type];
 652         int status;
 653         struct buffer_head *bh = NULL;
 654         struct ocfs2_quota_recovery *rec;
 655         int locked = 0;
 656
 657         /* We don't need the lock and we have to acquire quota file locks
 658          * which will later depend on this lock */
 659         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 660         info->dqi_maxblimit = 0x7fffffffffffffffLL;
 661         info->dqi_maxilimit = 0x7fffffffffffffffLL;
 662         oinfo = kmalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
 663         if (!oinfo) {
 664                 mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
 665                                " info.");
 666                 goto out_err;
 667         }
 668         info->dqi_priv = oinfo;
 669         oinfo->dqi_type = type;
 670         INIT_LIST_HEAD(&oinfo->dqi_chunk);
 671         oinfo->dqi_rec = NULL;
 672         oinfo->dqi_lqi_bh = NULL;
 673         oinfo->dqi_ibh = NULL;
 674
 675         status = ocfs2_global_read_info(sb, type);
 676         if (status < 0)
 677                 goto out_err;
 678
 679         status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
 680         if (status < 0) {
 681                 mlog_errno(status);
 682                 goto out_err;
 683         }
 684         locked = 1;
 685
 686         /* Now read local header */
 687         status = ocfs2_read_quota_block(lqinode, 0, &bh);
 688         if (status) {
 689                 mlog_errno(status);
 690                 mlog(ML_ERROR, "failed to read quota file info header "
 691                         "(type=%d)\n", type);
 692                 goto out_err;
 693         }
 694         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 695                                                 OCFS2_LOCAL_INFO_OFF);
 696         info->dqi_flags = le32_to_cpu(ldinfo->dqi_flags);
 697         oinfo->dqi_chunks = le32_to_cpu(ldinfo->dqi_chunks);
 698         oinfo->dqi_blocks = le32_to_cpu(ldinfo->dqi_blocks);
 699         oinfo->dqi_ibh = bh;
 700
 701         /* We crashed when using local quota file? */
 702         if (!(info->dqi_flags & OLQF_CLEAN)) {
 703                 rec = OCFS2_SB(sb)->quota_rec;
 704                 if (!rec) {
 705                         rec = ocfs2_alloc_quota_recovery();
 706                         if (!rec) {
 707                                 status = -ENOMEM;
 708                                 mlog_errno(status);
 709                                 goto out_err;
 710                         }
 711                         OCFS2_SB(sb)->quota_rec = rec;
 712                 }
 713
 714                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 715                                                    &rec->r_list[type]);
 716                 if (status < 0) {
 717                         mlog_errno(status);
 718                         goto out_err;
 719                 }
 720         }
 721
 722         status = ocfs2_load_local_quota_bitmaps(lqinode,
 723                                                 ldinfo,
 724                                                 &oinfo->dqi_chunk);
 725         if (status < 0) {
 726                 mlog_errno(status);
 727                 goto out_err;
 728         }
 729
 730         /* Now mark quota file as used */
 731         info->dqi_flags &= ~OLQF_CLEAN;
 732         status = ocfs2_modify_bh(lqinode, bh, olq_update_info, info);
 733         if (status < 0) {
 734                 mlog_errno(status);
 735                 goto out_err;
 736         }
 737
 738         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 739         return 0;
 740 out_err:
 741         if (oinfo) {
 742                 iput(oinfo->dqi_gqinode);
 743                 ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 744                 ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 745                 brelse(oinfo->dqi_lqi_bh);
 746                 if (locked)
 747                         ocfs2_inode_unlock(lqinode, 1);
 748                 ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 749                 kfree(oinfo);
 750         }
 751         brelse(bh);
 752         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 753         return -1;
 754 }
 755
 756 /* Write local info to quota file */
 757 static int ocfs2_local_write_info(struct super_block *sb, int type)
 758 {
 759         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 760         struct buffer_head *bh = ((struct ocfs2_mem_dqinfo *)info->dqi_priv)
 761                                                 ->dqi_ibh;
 762         int status;
 763
 764         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type], bh, olq_update_info,
 765                                  info);
 766         if (status < 0) {
 767                 mlog_errno(status);
 768                 return -1;
 769         }
 770
 771         return 0;
 772 }
 773
 774 /* Release info from memory */
 775 static int ocfs2_local_free_info(struct super_block *sb, int type)
 776 {
 777         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 778         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 779         struct ocfs2_quota_chunk *chunk;
 780         struct ocfs2_local_disk_chunk *dchunk;
 781         int mark_clean = 1, len;
 782         int status;
 783
 784         /* At this point we know there are no more dquots and thus
 785          * even if there's some sync in the pdflush queue, it won't
 786          * find any dquots and return without doing anything */
 787         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 788         iput(oinfo->dqi_gqinode);
 789         ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 790         ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 791         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 792                 dchunk = (struct ocfs2_local_disk_chunk *)
 793                                         (chunk->qc_headerbh->b_data);
 794                 if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 795                         len = ol_chunk_entries(sb);
 796                 } else {
 797                         len = (oinfo->dqi_blocks -
 798                                ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 799                               * ol_quota_entries_per_block(sb);
 800                 }
 801                 /* Not all entries free? Bug! */
 802                 if (le32_to_cpu(dchunk->dqc_free) != len) {
 803                         mlog(ML_ERROR, "releasing quota file with used "
 804                                         "entries (type=%d)\n", type);
 805                         mark_clean = 0;
 806                 }
 807         }
 808         ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 809
 810         /* dqonoff_mutex protects us against racing with recovery thread... */
 811         if (oinfo->dqi_rec) {
 812                 ocfs2_free_quota_recovery(oinfo->dqi_rec);
 813                 mark_clean = 0;
 814         }
 815
 816         if (!mark_clean)
 817                 goto out;
 818
 819         /* Mark local file as clean */
 820         info->dqi_flags |= OLQF_CLEAN;
 821         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type],
 822                                  oinfo->dqi_ibh,
 823                                  olq_update_info,
 824                                  info);
 825         if (status < 0) {
 826                 mlog_errno(status);
 827                 goto out;
 828         }
 829
 830 out:
 831         ocfs2_inode_unlock(sb_dqopt(sb)->files[type], 1);
 832         brelse(oinfo->dqi_ibh);
 833         brelse(oinfo->dqi_lqi_bh);
 834         kfree(oinfo);
 835         return 0;
 836 }
 837
 838 static void olq_set_dquot(struct buffer_head *bh, void *private)
 839 {
 840         struct ocfs2_dquot *od = private;
 841         struct ocfs2_local_disk_dqblk *dqblk;
 842         struct super_block *sb = od->dq_dquot.dq_sb;
 843
 844         dqblk = (struct ocfs2_local_disk_dqblk *)(bh->b_data
 845                 + ol_dqblk_block_offset(sb, od->dq_local_off));
 846
 847         dqblk->dqb_id = cpu_to_le64(od->dq_dquot.dq_id);
 848         spin_lock(&dq_data_lock);
 849         dqblk->dqb_spacemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curspace -
 850                                           od->dq_origspace);
 851         dqblk->dqb_inodemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curinodes -
 852                                           od->dq_originodes);
 853         spin_unlock(&dq_data_lock);
 854         mlog(0, "Writing local dquot %u space %lld inodes %lld\n",
 855              od->dq_dquot.dq_id, (long long)le64_to_cpu(dqblk->dqb_spacemod),
 856              (long long)le64_to_cpu(dqblk->dqb_inodemod));
 857 }
 858
 859 /* Write dquot to local quota file */
 860 static int ocfs2_local_write_dquot(struct dquot *dquot)
 861 {
 862         struct super_block *sb = dquot->dq_sb;
 863         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
 864         struct buffer_head *bh = NULL;
 865         int status;
 866
 867         status = ocfs2_read_quota_block(sb_dqopt(sb)->files[dquot->dq_type],
 868                                     ol_dqblk_file_block(sb, od->dq_local_off),
 869                                     &bh);
 870         if (status) {
 871                 mlog_errno(status);
 872                 goto out;
 873         }
 874         status = ocfs2_modify_bh(sb_dqopt(sb)->files[dquot->dq_type], bh,
 875                                  olq_set_dquot, od);
 876         if (status < 0) {
 877                 mlog_errno(status);
 878                 goto out;
 879         }
 880 out:
 881         brelse(bh);
 882         return status;
 883 }
 884
 885 /* Find free entry in local quota file */
 886 static struct ocfs2_quota_chunk *ocfs2_find_free_entry(struct super_block *sb,
 887                                                        int type,
 888                                                        int *offset)
 889 {
 890         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 891         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 892         struct ocfs2_quota_chunk *chunk;
 893         struct ocfs2_local_disk_chunk *dchunk;
 894         int found = 0, len;
 895
 896         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 897                 dchunk = (struct ocfs2_local_disk_chunk *)
 898                                                 chunk->qc_headerbh->b_data;
 899                 if (le32_to_cpu(dchunk->dqc_free) > 0) {
 900                         found = 1;
 901                         break;
 902                 }
 903         }
 904         if (!found)
 905                 return NULL;
 906
 907         if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 908                 len = ol_chunk_entries(sb);
 909         } else {
 910                 len = (oinfo->dqi_blocks -
 911                        ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 912                       * ol_quota_entries_per_block(sb);
 913         }
 914
 915         found = ocfs2_find_next_zero_bit(dchunk->dqc_bitmap, len, 0);
 916         /* We failed? */
 917         if (found == len) {
 918                 mlog(ML_ERROR, "Did not find empty entry in chunk %d with %u"
 919                      " entries free (type=%d)\n", chunk->qc_num,
 920                      le32_to_cpu(dchunk->dqc_free), type);
 921                 return ERR_PTR(-EIO);
 922         }
 923         *offset = found;
 924         return chunk;
 925 }
 926
 927 /* Add new chunk to the local quota file */
 928 static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
 929                                                         struct super_block *sb,
 930                                                         int type,
 931                                                         int *offset)
 932 {
 933         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 934         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 935         struct inode *lqinode = sb_dqopt(sb)->files[type];
 936         struct ocfs2_quota_chunk *chunk = NULL;
 937         struct ocfs2_local_disk_chunk *dchunk;
 938         int status;
 939         handle_t *handle;
 940         struct buffer_head *bh = NULL, *dbh = NULL;
 941         u64 p_blkno;
 942
 943         /* We are protected by dqio_sem so no locking needed */
 944         status = ocfs2_extend_no_holes(lqinode,
 945                                        lqinode->i_size + 2 * sb->s_blocksize,
 946                                        lqinode->i_size);
 947         if (status < 0) {
 948                 mlog_errno(status);
 949                 goto out;
 950         }
 951         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
 952                                           lqinode->i_size + 2 * sb->s_blocksize);
 953         if (status < 0) {
 954                 mlog_errno(status);
 955                 goto out;
 956         }
 957
 958         chunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
 959         if (!chunk) {
 960                 status = -ENOMEM;
 961                 mlog_errno(status);
 962                 goto out;
 963         }
 964         /* Local quota info and two new blocks we initialize */
 965         handle = ocfs2_start_trans(OCFS2_SB(sb),
 966                         OCFS2_LOCAL_QINFO_WRITE_CREDITS +
 967                         2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
 968         if (IS_ERR(handle)) {
 969                 status = PTR_ERR(handle);
 970                 mlog_errno(status);
 971                 goto out;
 972         }
 973
 974         /* Initialize chunk header */
 975         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
 976         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
 977                                              &p_blkno, NULL, NULL);
 978         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
 979         if (status < 0) {
 980                 mlog_errno(status);
 981                 goto out_trans;
 982         }
 983         bh = sb_getblk(sb, p_blkno);
 984         if (!bh) {
 985                 status = -ENOMEM;
 986                 mlog_errno(status);
 987                 goto out_trans;
 988         }
 989         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
 990         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
 991         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
 992                                          OCFS2_JOURNAL_ACCESS_CREATE);
 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         unlock_buffer(bh);
1003         ocfs2_journal_dirty(handle, bh);
1004
1005         /* Initialize new block with structures */
1006         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1007         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks + 1,
1008                                              &p_blkno, NULL, NULL);
1009         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1010         if (status < 0) {
1011                 mlog_errno(status);
1012                 goto out_trans;
1013         }
1014         dbh = sb_getblk(sb, p_blkno);
1015         if (!dbh) {
1016                 status = -ENOMEM;
1017                 mlog_errno(status);
1018                 goto out_trans;
1019         }
1020         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), dbh);
1021         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), dbh,
1022                                          OCFS2_JOURNAL_ACCESS_CREATE);
1023         if (status < 0) {
1024                 mlog_errno(status);
1025                 goto out_trans;
1026         }
1027         lock_buffer(dbh);
1028         memset(dbh->b_data, 0, sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE);
1029         unlock_buffer(dbh);
1030         ocfs2_journal_dirty(handle, dbh);
1031
1032         /* Update local quotafile info */
1033         oinfo->dqi_blocks += 2;
1034         oinfo->dqi_chunks++;
1035         status = ocfs2_local_write_info(sb, type);
1036         if (status < 0) {
1037                 mlog_errno(status);
1038                 goto out_trans;
1039         }
1040         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1041         if (status < 0) {
1042                 mlog_errno(status);
1043                 goto out;
1044         }
1045
1046         list_add_tail(&chunk->qc_chunk, &oinfo->dqi_chunk);
1047         chunk->qc_num = list_entry(chunk->qc_chunk.prev,
1048                                    struct ocfs2_quota_chunk,
1049                                    qc_chunk)->qc_num + 1;
1050         chunk->qc_headerbh = bh;
1051         *offset = 0;
1052         return chunk;
1053 out_trans:
1054         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1055 out:
1056         brelse(bh);
1057         brelse(dbh);
1058         kmem_cache_free(ocfs2_qf_chunk_cachep, chunk);
1059         return ERR_PTR(status);
1060 }
1061
1062 /* Find free entry in local quota file */
1063 static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
1064                                                        struct super_block *sb,
1065                                                        int type,
1066                                                        int *offset)
1067 {
1068         struct mem_dqinfo *info = sb_dqinfo(sb, type);
1069         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
1070         struct ocfs2_quota_chunk *chunk;
1071         struct inode *lqinode = sb_dqopt(sb)->files[type];
1072         struct ocfs2_local_disk_chunk *dchunk;
1073         int epb = ol_quota_entries_per_block(sb);
1074         unsigned int chunk_blocks;
1075         struct buffer_head *bh;
1076         u64 p_blkno;
1077         int status;
1078         handle_t *handle;
1079
1080         if (list_empty(&oinfo->dqi_chunk))
1081                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1082         /* Is the last chunk full? */
1083         chunk = list_entry(oinfo->dqi_chunk.prev,
1084                         struct ocfs2_quota_chunk, qc_chunk);
1085         chunk_blocks = oinfo->dqi_blocks -
1086                         ol_quota_chunk_block(sb, chunk->qc_num) - 1;
1087         if (ol_chunk_blocks(sb) == chunk_blocks)
1088                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1089
1090         /* We are protected by dqio_sem so no locking needed */
1091         status = ocfs2_extend_no_holes(lqinode,
1092                                        lqinode->i_size + sb->s_blocksize,
1093                                        lqinode->i_size);
1094         if (status < 0) {
1095                 mlog_errno(status);
1096                 goto out;
1097         }
1098         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
1099                                           lqinode->i_size + sb->s_blocksize);
1100         if (status < 0) {
1101                 mlog_errno(status);
1102                 goto out;
1103         }
1104
1105         /* Get buffer from the just added block */
1106         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1107         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
1108                                              &p_blkno, NULL, NULL);
1109         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1110         if (status < 0) {
1111                 mlog_errno(status);
1112                 goto out;
1113         }
1114         bh = sb_getblk(sb, p_blkno);
1115         if (!bh) {
1116                 status = -ENOMEM;
1117                 mlog_errno(status);
1118                 goto out;
1119         }
1120         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
1121
1122         /* Local quota info, chunk header and the new block we initialize */
1123         handle = ocfs2_start_trans(OCFS2_SB(sb),
1124                         OCFS2_LOCAL_QINFO_WRITE_CREDITS +
1125                         2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
1126         if (IS_ERR(handle)) {
1127                 status = PTR_ERR(handle);
1128                 mlog_errno(status);
1129                 goto out;
1130         }
1131         /* Zero created block */
1132         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
1133                                  OCFS2_JOURNAL_ACCESS_CREATE);
1134         if (status < 0) {
1135                 mlog_errno(status);
1136                 goto out_trans;
1137         }
1138         lock_buffer(bh);
1139         memset(bh->b_data, 0, sb->s_blocksize);
1140         unlock_buffer(bh);
1141         ocfs2_journal_dirty(handle, bh);
1142
1143         /* Update chunk header */
1144         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
1145                                          chunk->qc_headerbh,
1146                                  OCFS2_JOURNAL_ACCESS_WRITE);
1147         if (status < 0) {
1148                 mlog_errno(status);
1149                 goto out_trans;
1150         }
1151
1152         dchunk = (struct ocfs2_local_disk_chunk *)chunk->qc_headerbh->b_data;
1153         lock_buffer(chunk->qc_headerbh);
1154         le32_add_cpu(&dchunk->dqc_free, ol_quota_entries_per_block(sb));
1155         unlock_buffer(chunk->qc_headerbh);
1156         ocfs2_journal_dirty(handle, chunk->qc_headerbh);
1157
1158         /* Update file header */
1159         oinfo->dqi_blocks++;
1160         status = ocfs2_local_write_info(sb, type);
1161         if (status < 0) {
1162                 mlog_errno(status);
1163                 goto out_trans;
1164         }
1165
1166         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1167         if (status < 0) {
1168                 mlog_errno(status);
1169                 goto out;
1170         }
1171         *offset = chunk_blocks * epb;
1172         return chunk;
1173 out_trans:
1174         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1175 out:
1176         return ERR_PTR(status);
1177 }
1178
1179 static void olq_alloc_dquot(struct buffer_head *bh, void *private)
1180 {
1181         int *offset = private;
1182         struct ocfs2_local_disk_chunk *dchunk;
1183
1184         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
1185         ocfs2_set_bit(*offset, dchunk->dqc_bitmap);
1186         le32_add_cpu(&dchunk->dqc_free, -1);
1187 }
1188
1189 /* Create dquot in the local file for given id */
1190 static int ocfs2_create_local_dquot(struct dquot *dquot)
1191 {
1192         struct super_block *sb = dquot->dq_sb;
1193         int type = dquot->dq_type;
1194         struct inode *lqinode = sb_dqopt(sb)->files[type];
1195         struct ocfs2_quota_chunk *chunk;
1196         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1197         int offset;
1198         int status;
1199
1200         chunk = ocfs2_find_free_entry(sb, type, &offset);
1201         if (!chunk) {
1202                 chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
1203                 if (IS_ERR(chunk))
1204                         return PTR_ERR(chunk);
1205         } else if (IS_ERR(chunk)) {
1206                 return PTR_ERR(chunk);
1207         }
1208         od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
1209         od->dq_chunk = chunk;
1210
1211         /* Initialize dquot structure on disk */
1212         status = ocfs2_local_write_dquot(dquot);
1213         if (status < 0) {
1214                 mlog_errno(status);
1215                 goto out;
1216         }
1217
1218         /* Mark structure as allocated */
1219         status = ocfs2_modify_bh(lqinode, chunk->qc_headerbh, olq_alloc_dquot,
1220                                  &offset);
1221         if (status < 0) {
1222                 mlog_errno(status);
1223                 goto out;
1224         }
1225 out:
1226         return status;
1227 }
1228
1229 /* Create entry in local file for dquot, load data from the global file */
1230 static int ocfs2_local_read_dquot(struct dquot *dquot)
1231 {
1232         int status;
1233
1234         mlog_entry("id=%u, type=%d\n", dquot->dq_id, dquot->dq_type);
1235
1236         status = ocfs2_global_read_dquot(dquot);
1237         if (status < 0) {
1238                 mlog_errno(status);
1239                 goto out_err;
1240         }
1241
1242         /* Now create entry in the local quota file */
1243         status = ocfs2_create_local_dquot(dquot);
1244         if (status < 0) {
1245                 mlog_errno(status);
1246                 goto out_err;
1247         }
1248         mlog_exit(0);
1249         return 0;
1250 out_err:
1251         mlog_exit(status);
1252         return status;
1253 }
1254
1255 /* Release dquot structure from local quota file. ocfs2_release_dquot() has
1256  * already started a transaction and obtained exclusive lock for global
1257  * quota file. */
1258 static int ocfs2_local_release_dquot(struct dquot *dquot)
1259 {
1260         int status;
1261         int type = dquot->dq_type;
1262         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1263         struct super_block *sb = dquot->dq_sb;
1264         struct ocfs2_local_disk_chunk *dchunk;
1265         int offset;
1266         handle_t *handle = journal_current_handle();
1267
1268         BUG_ON(!handle);
1269         /* First write all local changes to global file */
1270         status = ocfs2_global_release_dquot(dquot);
1271         if (status < 0) {
1272                 mlog_errno(status);
1273                 goto out;
1274         }
1275
1276         status = ocfs2_journal_access_dq(handle,
1277                         INODE_CACHE(sb_dqopt(sb)->files[type]),
1278                         od->dq_chunk->qc_headerbh, OCFS2_JOURNAL_ACCESS_WRITE);
1279         if (status < 0) {
1280                 mlog_errno(status);
1281                 goto out;
1282         }
1283         offset = ol_dqblk_chunk_off(sb, od->dq_chunk->qc_num,
1284                                              od->dq_local_off);
1285         dchunk = (struct ocfs2_local_disk_chunk *)
1286                         (od->dq_chunk->qc_headerbh->b_data);
1287         /* Mark structure as freed */
1288         lock_buffer(od->dq_chunk->qc_headerbh);
1289         ocfs2_clear_bit(offset, dchunk->dqc_bitmap);
1290         le32_add_cpu(&dchunk->dqc_free, 1);
1291         unlock_buffer(od->dq_chunk->qc_headerbh);
1292         ocfs2_journal_dirty(handle, od->dq_chunk->qc_headerbh);
1293
1294 out:
1295         /* Clear the read bit so that next time someone uses this
1296          * dquot he reads fresh info from disk and allocates local
1297          * dquot structure */
1298         clear_bit(DQ_READ_B, &dquot->dq_flags);
1299         return status;
1300 }
1301
1302 static const struct quota_format_ops ocfs2_format_ops = {
1303         .check_quota_file       = ocfs2_local_check_quota_file,
1304         .read_file_info         = ocfs2_local_read_info,
1305         .write_file_info        = ocfs2_global_write_info,
1306         .free_file_info         = ocfs2_local_free_info,
1307         .read_dqblk             = ocfs2_local_read_dquot,
1308         .commit_dqblk           = ocfs2_local_write_dquot,
1309         .release_dqblk          = ocfs2_local_release_dquot,
1310 };
1311
1312 struct quota_format_type ocfs2_quota_format = {
1313         .qf_fmt_id = QFMT_OCFS2,
1314         .qf_ops = &ocfs2_format_ops,
1315         .qf_owner = THIS_MODULE
1316 };