Pileus Git - ~andy/linux/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
  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(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;
 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         bh = ocfs2_read_quota_block(linode, 0, &status);
 150         if (!bh) {
 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         bh = ocfs2_read_quota_block(ginode, 0, &status);
 182         if (!bh) {
 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 = ocfs2_read_quota_block(inode,
 239                                 ol_quota_chunk_block(inode->i_sb, i),
 240                                 &status);
 241                 if (!newchunk->qc_headerbh) {
 242                         mlog_errno(status);
 243                         kmem_cache_free(ocfs2_qf_chunk_cachep, newchunk);
 244                         ocfs2_release_local_quota_bitmaps(head);
 245                         return status;
 246                 }
 247                 list_add_tail(&newchunk->qc_chunk, head);
 248         }
 249         return 0;
 250 }
 251
 252 static void olq_update_info(struct buffer_head *bh, void *private)
 253 {
 254         struct mem_dqinfo *info = private;
 255         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 256         struct ocfs2_local_disk_dqinfo *ldinfo;
 257
 258         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 259                                                 OCFS2_LOCAL_INFO_OFF);
 260         spin_lock(&dq_data_lock);
 261         ldinfo->dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
 262         ldinfo->dqi_chunks = cpu_to_le32(oinfo->dqi_chunks);
 263         ldinfo->dqi_blocks = cpu_to_le32(oinfo->dqi_blocks);
 264         spin_unlock(&dq_data_lock);
 265 }
 266
 267 static int ocfs2_add_recovery_chunk(struct super_block *sb,
 268                                     struct ocfs2_local_disk_chunk *dchunk,
 269                                     int chunk,
 270                                     struct list_head *head)
 271 {
 272         struct ocfs2_recovery_chunk *rc;
 273
 274         rc = kmalloc(sizeof(struct ocfs2_recovery_chunk), GFP_NOFS);
 275         if (!rc)
 276                 return -ENOMEM;
 277         rc->rc_chunk = chunk;
 278         rc->rc_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
 279         if (!rc->rc_bitmap) {
 280                 kfree(rc);
 281                 return -ENOMEM;
 282         }
 283         memcpy(rc->rc_bitmap, dchunk->dqc_bitmap,
 284                (ol_chunk_entries(sb) + 7) >> 3);
 285         list_add_tail(&rc->rc_list, head);
 286         return 0;
 287 }
 288
 289 static void free_recovery_list(struct list_head *head)
 290 {
 291         struct ocfs2_recovery_chunk *next;
 292         struct ocfs2_recovery_chunk *rchunk;
 293
 294         list_for_each_entry_safe(rchunk, next, head, rc_list) {
 295                 list_del(&rchunk->rc_list);
 296                 kfree(rchunk->rc_bitmap);
 297                 kfree(rchunk);
 298         }
 299 }
 300
 301 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec)
 302 {
 303         int type;
 304
 305         for (type = 0; type < MAXQUOTAS; type++)
 306                 free_recovery_list(&(rec->r_list[type]));
 307         kfree(rec);
 308 }
 309
 310 /* Load entries in our quota file we have to recover*/
 311 static int ocfs2_recovery_load_quota(struct inode *lqinode,
 312                                      struct ocfs2_local_disk_dqinfo *ldinfo,
 313                                      int type,
 314                                      struct list_head *head)
 315 {
 316         struct super_block *sb = lqinode->i_sb;
 317         struct buffer_head *hbh;
 318         struct ocfs2_local_disk_chunk *dchunk;
 319         int i, chunks = le32_to_cpu(ldinfo->dqi_chunks);
 320         int status = 0;
 321
 322         for (i = 0; i < chunks; i++) {
 323                 hbh = ocfs2_read_quota_block(lqinode,
 324                                              ol_quota_chunk_block(sb, i),
 325                                              &status);
 326                 if (!hbh) {
 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 = ocfs2_read_quota_block(lqinode, 0, &status);
 396                 if (!bh) {
 397                         mlog_errno(status);
 398                         mlog(ML_ERROR, "failed to read quota file info header "
 399                                 "(slot=%d type=%d)\n", slot_num, type);
 400                         goto out_lock;
 401                 }
 402                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 403                                                         OCFS2_LOCAL_INFO_OFF);
 404                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 405                                                    &rec->r_list[type]);
 406                 brelse(bh);
 407 out_lock:
 408                 ocfs2_inode_unlock(lqinode, 1);
 409 out_put:
 410                 iput(lqinode);
 411                 if (status < 0)
 412                         break;
 413         }
 414 out:
 415         if (status < 0) {
 416                 ocfs2_free_quota_recovery(rec);
 417                 rec = ERR_PTR(status);
 418         }
 419         return rec;
 420 }
 421
 422 /* Sync changes in local quota file into global quota file and
 423  * reinitialize local quota file.
 424  * The function expects local quota file to be already locked and
 425  * dqonoff_mutex locked. */
 426 static int ocfs2_recover_local_quota_file(struct inode *lqinode,
 427                                           int type,
 428                                           struct ocfs2_quota_recovery *rec)
 429 {
 430         struct super_block *sb = lqinode->i_sb;
 431         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 432         struct ocfs2_local_disk_chunk *dchunk;
 433         struct ocfs2_local_disk_dqblk *dqblk;
 434         struct dquot *dquot;
 435         handle_t *handle;
 436         struct buffer_head *hbh = NULL, *qbh = NULL;
 437         int status = 0;
 438         int bit, chunk;
 439         struct ocfs2_recovery_chunk *rchunk, *next;
 440         qsize_t spacechange, inodechange;
 441
 442         mlog_entry("ino=%lu type=%u", (unsigned long)lqinode->i_ino, type);
 443
 444         status = ocfs2_lock_global_qf(oinfo, 1);
 445         if (status < 0)
 446                 goto out;
 447
 448         list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
 449                 chunk = rchunk->rc_chunk;
 450                 hbh = ocfs2_read_quota_block(lqinode,
 451                                              ol_quota_chunk_block(sb, chunk),
 452                                              &status);
 453                 if (!hbh) {
 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 = ocfs2_read_quota_block(lqinode,
 460                                                 ol_dqblk_block(sb, chunk, bit),
 461                                                 &status);
 462                         if (!qbh) {
 463                                 mlog_errno(status);
 464                                 break;
 465                         }
 466                         dqblk = (struct ocfs2_local_disk_dqblk *)(qbh->b_data +
 467                                 ol_dqblk_block_off(sb, chunk, bit));
 468                         dquot = dqget(sb, le64_to_cpu(dqblk->dqb_id), type);
 469                         if (!dquot) {
 470                                 status = -EIO;
 471                                 mlog(ML_ERROR, "Failed to get quota structure "
 472                                      "for id %u, type %d. Cannot finish quota "
 473                                      "file recovery.\n",
 474                                      (unsigned)le64_to_cpu(dqblk->dqb_id),
 475                                      type);
 476                                 goto out_put_bh;
 477                         }
 478                         handle = ocfs2_start_trans(OCFS2_SB(sb),
 479                                                    OCFS2_QSYNC_CREDITS);
 480                         if (IS_ERR(handle)) {
 481                                 status = PTR_ERR(handle);
 482                                 mlog_errno(status);
 483                                 goto out_put_dquot;
 484                         }
 485                         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 486                         spin_lock(&dq_data_lock);
 487                         /* Add usage from quota entry into quota changes
 488                          * of our node. Auxiliary variables are important
 489                          * due to signedness */
 490                         spacechange = le64_to_cpu(dqblk->dqb_spacemod);
 491                         inodechange = le64_to_cpu(dqblk->dqb_inodemod);
 492                         dquot->dq_dqb.dqb_curspace += spacechange;
 493                         dquot->dq_dqb.dqb_curinodes += inodechange;
 494                         spin_unlock(&dq_data_lock);
 495                         /* We want to drop reference held by the crashed
 496                          * node. Since we have our own reference we know
 497                          * global structure actually won't be freed. */
 498                         status = ocfs2_global_release_dquot(dquot);
 499                         if (status < 0) {
 500                                 mlog_errno(status);
 501                                 goto out_commit;
 502                         }
 503                         /* Release local quota file entry */
 504                         status = ocfs2_journal_access(handle, lqinode,
 505                                         qbh, OCFS2_JOURNAL_ACCESS_WRITE);
 506                         if (status < 0) {
 507                                 mlog_errno(status);
 508                                 goto out_commit;
 509                         }
 510                         lock_buffer(qbh);
 511                         WARN_ON(!ocfs2_test_bit(bit, dchunk->dqc_bitmap));
 512                         ocfs2_clear_bit(bit, dchunk->dqc_bitmap);
 513                         le32_add_cpu(&dchunk->dqc_free, 1);
 514                         unlock_buffer(qbh);
 515                         status = ocfs2_journal_dirty(handle, qbh);
 516                         if (status < 0)
 517                                 mlog_errno(status);
 518 out_commit:
 519                         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 520                         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 521 out_put_dquot:
 522                         dqput(dquot);
 523 out_put_bh:
 524                         brelse(qbh);
 525                         if (status < 0)
 526                                 break;
 527                 }
 528                 brelse(hbh);
 529                 list_del(&rchunk->rc_list);
 530                 kfree(rchunk->rc_bitmap);
 531                 kfree(rchunk);
 532                 if (status < 0)
 533                         break;
 534         }
 535         ocfs2_unlock_global_qf(oinfo, 1);
 536 out:
 537         if (status < 0)
 538                 free_recovery_list(&(rec->r_list[type]));
 539         mlog_exit(status);
 540         return status;
 541 }
 542
 543 /* Recover local quota files for given node different from us */
 544 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
 545                                 struct ocfs2_quota_recovery *rec,
 546                                 int slot_num)
 547 {
 548         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 549                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 550         struct super_block *sb = osb->sb;
 551         struct ocfs2_local_disk_dqinfo *ldinfo;
 552         struct buffer_head *bh;
 553         handle_t *handle;
 554         int type;
 555         int status = 0;
 556         struct inode *lqinode;
 557         unsigned int flags;
 558
 559         mlog(ML_NOTICE, "Finishing quota recovery in slot %u\n", slot_num);
 560         mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
 561         for (type = 0; type < MAXQUOTAS; type++) {
 562                 if (list_empty(&(rec->r_list[type])))
 563                         continue;
 564                 mlog(0, "Recovering quota in slot %d\n", slot_num);
 565                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
 566                 if (!lqinode) {
 567                         status = -ENOENT;
 568                         goto out;
 569                 }
 570                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
 571                                                        OCFS2_META_LOCK_NOQUEUE);
 572                 /* Someone else is holding the lock? Then he must be
 573                  * doing the recovery. Just skip the file... */
 574                 if (status == -EAGAIN) {
 575                         mlog(ML_NOTICE, "skipping quota recovery for slot %d "
 576                              "because quota file is locked.\n", slot_num);
 577                         status = 0;
 578                         goto out_put;
 579                 } else if (status < 0) {
 580                         mlog_errno(status);
 581                         goto out_put;
 582                 }
 583                 /* Now read local header */
 584                 bh = ocfs2_read_quota_block(lqinode, 0, &status);
 585                 if (!bh) {
 586                         mlog_errno(status);
 587                         mlog(ML_ERROR, "failed to read quota file info header "
 588                                 "(slot=%d type=%d)\n", slot_num, type);
 589                         goto out_lock;
 590                 }
 591                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 592                                                         OCFS2_LOCAL_INFO_OFF);
 593                 /* Is recovery still needed? */
 594                 flags = le32_to_cpu(ldinfo->dqi_flags);
 595                 if (!(flags & OLQF_CLEAN))
 596                         status = ocfs2_recover_local_quota_file(lqinode,
 597                                                                 type,
 598                                                                 rec);
 599                 /* We don't want to mark file as clean when it is actually
 600                  * active */
 601                 if (slot_num == osb->slot_num)
 602                         goto out_bh;
 603                 /* Mark quota file as clean if we are recovering quota file of
 604                  * some other node. */
 605                 handle = ocfs2_start_trans(osb, 1);
 606                 if (IS_ERR(handle)) {
 607                         status = PTR_ERR(handle);
 608                         mlog_errno(status);
 609                         goto out_bh;
 610                 }
 611                 status = ocfs2_journal_access(handle, lqinode, bh,
 612                                               OCFS2_JOURNAL_ACCESS_WRITE);
 613                 if (status < 0) {
 614                         mlog_errno(status);
 615                         goto out_trans;
 616                 }
 617                 lock_buffer(bh);
 618                 ldinfo->dqi_flags = cpu_to_le32(flags | OLQF_CLEAN);
 619                 unlock_buffer(bh);
 620                 status = ocfs2_journal_dirty(handle, bh);
 621                 if (status < 0)
 622                         mlog_errno(status);
 623 out_trans:
 624                 ocfs2_commit_trans(osb, handle);
 625 out_bh:
 626                 brelse(bh);
 627 out_lock:
 628                 ocfs2_inode_unlock(lqinode, 1);
 629 out_put:
 630                 iput(lqinode);
 631                 if (status < 0)
 632                         break;
 633         }
 634 out:
 635         mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 636         kfree(rec);
 637         return status;
 638 }
 639
 640 /* Read information header from quota file */
 641 static int ocfs2_local_read_info(struct super_block *sb, int type)
 642 {
 643         struct ocfs2_local_disk_dqinfo *ldinfo;
 644         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 645         struct ocfs2_mem_dqinfo *oinfo;
 646         struct inode *lqinode = sb_dqopt(sb)->files[type];
 647         int status;
 648         struct buffer_head *bh = NULL;
 649         struct ocfs2_quota_recovery *rec;
 650         int locked = 0;
 651
 652         info->dqi_maxblimit = 0x7fffffffffffffffLL;
 653         info->dqi_maxilimit = 0x7fffffffffffffffLL;
 654         oinfo = kmalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
 655         if (!oinfo) {
 656                 mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
 657                                " info.");
 658                 goto out_err;
 659         }
 660         info->dqi_priv = oinfo;
 661         oinfo->dqi_type = type;
 662         INIT_LIST_HEAD(&oinfo->dqi_chunk);
 663         oinfo->dqi_rec = NULL;
 664         oinfo->dqi_lqi_bh = NULL;
 665         oinfo->dqi_ibh = NULL;
 666
 667         status = ocfs2_global_read_info(sb, type);
 668         if (status < 0)
 669                 goto out_err;
 670
 671         status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
 672         if (status < 0) {
 673                 mlog_errno(status);
 674                 goto out_err;
 675         }
 676         locked = 1;
 677
 678         /* Now read local header */
 679         bh = ocfs2_read_quota_block(lqinode, 0, &status);
 680         if (!bh) {
 681                 mlog_errno(status);
 682                 mlog(ML_ERROR, "failed to read quota file info header "
 683                         "(type=%d)\n", type);
 684                 goto out_err;
 685         }
 686         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 687                                                 OCFS2_LOCAL_INFO_OFF);
 688         info->dqi_flags = le32_to_cpu(ldinfo->dqi_flags);
 689         oinfo->dqi_chunks = le32_to_cpu(ldinfo->dqi_chunks);
 690         oinfo->dqi_blocks = le32_to_cpu(ldinfo->dqi_blocks);
 691         oinfo->dqi_ibh = bh;
 692
 693         /* We crashed when using local quota file? */
 694         if (!(info->dqi_flags & OLQF_CLEAN)) {
 695                 rec = OCFS2_SB(sb)->quota_rec;
 696                 if (!rec) {
 697                         rec = ocfs2_alloc_quota_recovery();
 698                         if (!rec) {
 699                                 status = -ENOMEM;
 700                                 mlog_errno(status);
 701                                 goto out_err;
 702                         }
 703                         OCFS2_SB(sb)->quota_rec = rec;
 704                 }
 705
 706                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 707                                                    &rec->r_list[type]);
 708                 if (status < 0) {
 709                         mlog_errno(status);
 710                         goto out_err;
 711                 }
 712         }
 713
 714         status = ocfs2_load_local_quota_bitmaps(lqinode,
 715                                                 ldinfo,
 716                                                 &oinfo->dqi_chunk);
 717         if (status < 0) {
 718                 mlog_errno(status);
 719                 goto out_err;
 720         }
 721
 722         /* Now mark quota file as used */
 723         info->dqi_flags &= ~OLQF_CLEAN;
 724         status = ocfs2_modify_bh(lqinode, bh, olq_update_info, info);
 725         if (status < 0) {
 726                 mlog_errno(status);
 727                 goto out_err;
 728         }
 729
 730         return 0;
 731 out_err:
 732         if (oinfo) {
 733                 iput(oinfo->dqi_gqinode);
 734                 ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 735                 ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 736                 brelse(oinfo->dqi_lqi_bh);
 737                 if (locked)
 738                         ocfs2_inode_unlock(lqinode, 1);
 739                 ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 740                 kfree(oinfo);
 741         }
 742         brelse(bh);
 743         return -1;
 744 }
 745
 746 /* Write local info to quota file */
 747 static int ocfs2_local_write_info(struct super_block *sb, int type)
 748 {
 749         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 750         struct buffer_head *bh = ((struct ocfs2_mem_dqinfo *)info->dqi_priv)
 751                                                 ->dqi_ibh;
 752         int status;
 753
 754         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type], bh, olq_update_info,
 755                                  info);
 756         if (status < 0) {
 757                 mlog_errno(status);
 758                 return -1;
 759         }
 760
 761         return 0;
 762 }
 763
 764 /* Release info from memory */
 765 static int ocfs2_local_free_info(struct super_block *sb, int type)
 766 {
 767         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 768         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 769         struct ocfs2_quota_chunk *chunk;
 770         struct ocfs2_local_disk_chunk *dchunk;
 771         int mark_clean = 1, len;
 772         int status;
 773
 774         /* At this point we know there are no more dquots and thus
 775          * even if there's some sync in the pdflush queue, it won't
 776          * find any dquots and return without doing anything */
 777         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 778         iput(oinfo->dqi_gqinode);
 779         ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 780         ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 781         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 782                 dchunk = (struct ocfs2_local_disk_chunk *)
 783                                         (chunk->qc_headerbh->b_data);
 784                 if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 785                         len = ol_chunk_entries(sb);
 786                 } else {
 787                         len = (oinfo->dqi_blocks -
 788                                ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 789                               * ol_quota_entries_per_block(sb);
 790                 }
 791                 /* Not all entries free? Bug! */
 792                 if (le32_to_cpu(dchunk->dqc_free) != len) {
 793                         mlog(ML_ERROR, "releasing quota file with used "
 794                                         "entries (type=%d)\n", type);
 795                         mark_clean = 0;
 796                 }
 797         }
 798         ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 799
 800         /* dqonoff_mutex protects us against racing with recovery thread... */
 801         if (oinfo->dqi_rec) {
 802                 ocfs2_free_quota_recovery(oinfo->dqi_rec);
 803                 mark_clean = 0;
 804         }
 805
 806         if (!mark_clean)
 807                 goto out;
 808
 809         /* Mark local file as clean */
 810         info->dqi_flags |= OLQF_CLEAN;
 811         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type],
 812                                  oinfo->dqi_ibh,
 813                                  olq_update_info,
 814                                  info);
 815         if (status < 0) {
 816                 mlog_errno(status);
 817                 goto out;
 818         }
 819
 820 out:
 821         ocfs2_inode_unlock(sb_dqopt(sb)->files[type], 1);
 822         brelse(oinfo->dqi_ibh);
 823         brelse(oinfo->dqi_lqi_bh);
 824         kfree(oinfo);
 825         return 0;
 826 }
 827
 828 static void olq_set_dquot(struct buffer_head *bh, void *private)
 829 {
 830         struct ocfs2_dquot *od = private;
 831         struct ocfs2_local_disk_dqblk *dqblk;
 832         struct super_block *sb = od->dq_dquot.dq_sb;
 833
 834         dqblk = (struct ocfs2_local_disk_dqblk *)(bh->b_data
 835                 + ol_dqblk_block_offset(sb, od->dq_local_off));
 836
 837         dqblk->dqb_id = cpu_to_le64(od->dq_dquot.dq_id);
 838         spin_lock(&dq_data_lock);
 839         dqblk->dqb_spacemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curspace -
 840                                           od->dq_origspace);
 841         dqblk->dqb_inodemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curinodes -
 842                                           od->dq_originodes);
 843         spin_unlock(&dq_data_lock);
 844         mlog(0, "Writing local dquot %u space %lld inodes %lld\n",
 845              od->dq_dquot.dq_id, dqblk->dqb_spacemod, dqblk->dqb_inodemod);
 846 }
 847
 848 /* Write dquot to local quota file */
 849 static int ocfs2_local_write_dquot(struct dquot *dquot)
 850 {
 851         struct super_block *sb = dquot->dq_sb;
 852         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
 853         struct buffer_head *bh;
 854         int status;
 855
 856         bh = ocfs2_read_quota_block(sb_dqopt(sb)->files[dquot->dq_type],
 857                                     ol_dqblk_file_block(sb, od->dq_local_off),
 858                                     &status);
 859         if (!bh) {
 860                 mlog_errno(status);
 861                 goto out;
 862         }
 863         status = ocfs2_modify_bh(sb_dqopt(sb)->files[dquot->dq_type], bh,
 864                                  olq_set_dquot, od);
 865         if (status < 0) {
 866                 mlog_errno(status);
 867                 goto out;
 868         }
 869 out:
 870         brelse(bh);
 871         return status;
 872 }
 873
 874 /* Find free entry in local quota file */
 875 static struct ocfs2_quota_chunk *ocfs2_find_free_entry(struct super_block *sb,
 876                                                        int type,
 877                                                        int *offset)
 878 {
 879         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 880         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 881         struct ocfs2_quota_chunk *chunk;
 882         struct ocfs2_local_disk_chunk *dchunk;
 883         int found = 0, len;
 884
 885         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 886                 dchunk = (struct ocfs2_local_disk_chunk *)
 887                                                 chunk->qc_headerbh->b_data;
 888                 if (le32_to_cpu(dchunk->dqc_free) > 0) {
 889                         found = 1;
 890                         break;
 891                 }
 892         }
 893         if (!found)
 894                 return NULL;
 895
 896         if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 897                 len = ol_chunk_entries(sb);
 898         } else {
 899                 len = (oinfo->dqi_blocks -
 900                        ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 901                       * ol_quota_entries_per_block(sb);
 902         }
 903
 904         found = ocfs2_find_next_zero_bit(dchunk->dqc_bitmap, len, 0);
 905         /* We failed? */
 906         if (found == len) {
 907                 mlog(ML_ERROR, "Did not find empty entry in chunk %d with %u"
 908                      " entries free (type=%d)\n", chunk->qc_num,
 909                      le32_to_cpu(dchunk->dqc_free), type);
 910                 return ERR_PTR(-EIO);
 911         }
 912         *offset = found;
 913         return chunk;
 914 }
 915
 916 /* Add new chunk to the local quota file */
 917 static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
 918                                                         struct super_block *sb,
 919                                                         int type,
 920                                                         int *offset)
 921 {
 922         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 923         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 924         struct inode *lqinode = sb_dqopt(sb)->files[type];
 925         struct ocfs2_quota_chunk *chunk = NULL;
 926         struct ocfs2_local_disk_chunk *dchunk;
 927         int status;
 928         handle_t *handle;
 929         struct buffer_head *bh = NULL;
 930         u64 p_blkno;
 931
 932         /* We are protected by dqio_sem so no locking needed */
 933         status = ocfs2_extend_no_holes(lqinode,
 934                                        lqinode->i_size + 2 * sb->s_blocksize,
 935                                        lqinode->i_size);
 936         if (status < 0) {
 937                 mlog_errno(status);
 938                 goto out;
 939         }
 940         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
 941                                           lqinode->i_size + 2 * sb->s_blocksize);
 942         if (status < 0) {
 943                 mlog_errno(status);
 944                 goto out;
 945         }
 946
 947         chunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
 948         if (!chunk) {
 949                 status = -ENOMEM;
 950                 mlog_errno(status);
 951                 goto out;
 952         }
 953
 954         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
 955         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
 956                                              &p_blkno, NULL, NULL);
 957         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
 958         if (status < 0) {
 959                 mlog_errno(status);
 960                 goto out;
 961         }
 962         bh = sb_getblk(sb, p_blkno);
 963         if (!bh) {
 964                 status = -ENOMEM;
 965                 mlog_errno(status);
 966                 goto out;
 967         }
 968         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
 969
 970         handle = ocfs2_start_trans(OCFS2_SB(sb), 2);
 971         if (IS_ERR(handle)) {
 972                 status = PTR_ERR(handle);
 973                 mlog_errno(status);
 974                 goto out;
 975         }
 976
 977         status = ocfs2_journal_access(handle, lqinode, bh,
 978                                       OCFS2_JOURNAL_ACCESS_WRITE);
 979         if (status < 0) {
 980                 mlog_errno(status);
 981                 goto out_trans;
 982         }
 983         lock_buffer(bh);
 984         dchunk->dqc_free = ol_quota_entries_per_block(sb);
 985         memset(dchunk->dqc_bitmap, 0,
 986                sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
 987                OCFS2_QBLK_RESERVED_SPACE);
 988         set_buffer_uptodate(bh);
 989         unlock_buffer(bh);
 990         status = ocfs2_journal_dirty(handle, bh);
 991         if (status < 0) {
 992                 mlog_errno(status);
 993                 goto out_trans;
 994         }
 995
 996         oinfo->dqi_blocks += 2;
 997         oinfo->dqi_chunks++;
 998         status = ocfs2_local_write_info(sb, type);
 999         if (status < 0) {
1000                 mlog_errno(status);
1001                 goto out_trans;
1002         }
1003         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1004         if (status < 0) {
1005                 mlog_errno(status);
1006                 goto out;
1007         }
1008
1009         list_add_tail(&chunk->qc_chunk, &oinfo->dqi_chunk);
1010         chunk->qc_num = list_entry(chunk->qc_chunk.prev,
1011                                    struct ocfs2_quota_chunk,
1012                                    qc_chunk)->qc_num + 1;
1013         chunk->qc_headerbh = bh;
1014         *offset = 0;
1015         return chunk;
1016 out_trans:
1017         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1018 out:
1019         brelse(bh);
1020         kmem_cache_free(ocfs2_qf_chunk_cachep, chunk);
1021         return ERR_PTR(status);
1022 }
1023
1024 /* Find free entry in local quota file */
1025 static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
1026                                                        struct super_block *sb,
1027                                                        int type,
1028                                                        int *offset)
1029 {
1030         struct mem_dqinfo *info = sb_dqinfo(sb, type);
1031         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
1032         struct ocfs2_quota_chunk *chunk;
1033         struct inode *lqinode = sb_dqopt(sb)->files[type];
1034         struct ocfs2_local_disk_chunk *dchunk;
1035         int epb = ol_quota_entries_per_block(sb);
1036         unsigned int chunk_blocks;
1037         int status;
1038         handle_t *handle;
1039
1040         if (list_empty(&oinfo->dqi_chunk))
1041                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1042         /* Is the last chunk full? */
1043         chunk = list_entry(oinfo->dqi_chunk.prev,
1044                         struct ocfs2_quota_chunk, qc_chunk);
1045         chunk_blocks = oinfo->dqi_blocks -
1046                         ol_quota_chunk_block(sb, chunk->qc_num) - 1;
1047         if (ol_chunk_blocks(sb) == chunk_blocks)
1048                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1049
1050         /* We are protected by dqio_sem so no locking needed */
1051         status = ocfs2_extend_no_holes(lqinode,
1052                                        lqinode->i_size + sb->s_blocksize,
1053                                        lqinode->i_size);
1054         if (status < 0) {
1055                 mlog_errno(status);
1056                 goto out;
1057         }
1058         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
1059                                           lqinode->i_size + sb->s_blocksize);
1060         if (status < 0) {
1061                 mlog_errno(status);
1062                 goto out;
1063         }
1064         handle = ocfs2_start_trans(OCFS2_SB(sb), 2);
1065         if (IS_ERR(handle)) {
1066                 status = PTR_ERR(handle);
1067                 mlog_errno(status);
1068                 goto out;
1069         }
1070         status = ocfs2_journal_access(handle, lqinode, chunk->qc_headerbh,
1071                                  OCFS2_JOURNAL_ACCESS_WRITE);
1072         if (status < 0) {
1073                 mlog_errno(status);
1074                 goto out_trans;
1075         }
1076
1077         dchunk = (struct ocfs2_local_disk_chunk *)chunk->qc_headerbh->b_data;
1078         lock_buffer(chunk->qc_headerbh);
1079         le32_add_cpu(&dchunk->dqc_free, ol_quota_entries_per_block(sb));
1080         unlock_buffer(chunk->qc_headerbh);
1081         status = ocfs2_journal_dirty(handle, chunk->qc_headerbh);
1082         if (status < 0) {
1083                 mlog_errno(status);
1084                 goto out_trans;
1085         }
1086         oinfo->dqi_blocks++;
1087         status = ocfs2_local_write_info(sb, type);
1088         if (status < 0) {
1089                 mlog_errno(status);
1090                 goto out_trans;
1091         }
1092
1093         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1094         if (status < 0) {
1095                 mlog_errno(status);
1096                 goto out;
1097         }
1098         *offset = chunk_blocks * epb;
1099         return chunk;
1100 out_trans:
1101         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1102 out:
1103         return ERR_PTR(status);
1104 }
1105
1106 void olq_alloc_dquot(struct buffer_head *bh, void *private)
1107 {
1108         int *offset = private;
1109         struct ocfs2_local_disk_chunk *dchunk;
1110
1111         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
1112         ocfs2_set_bit(*offset, dchunk->dqc_bitmap);
1113         le32_add_cpu(&dchunk->dqc_free, -1);
1114 }
1115
1116 /* Create dquot in the local file for given id */
1117 static int ocfs2_create_local_dquot(struct dquot *dquot)
1118 {
1119         struct super_block *sb = dquot->dq_sb;
1120         int type = dquot->dq_type;
1121         struct inode *lqinode = sb_dqopt(sb)->files[type];
1122         struct ocfs2_quota_chunk *chunk;
1123         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1124         int offset;
1125         int status;
1126
1127         chunk = ocfs2_find_free_entry(sb, type, &offset);
1128         if (!chunk) {
1129                 chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
1130                 if (IS_ERR(chunk))
1131                         return PTR_ERR(chunk);
1132         } else if (IS_ERR(chunk)) {
1133                 return PTR_ERR(chunk);
1134         }
1135         od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
1136         od->dq_chunk = chunk;
1137
1138         /* Initialize dquot structure on disk */
1139         status = ocfs2_local_write_dquot(dquot);
1140         if (status < 0) {
1141                 mlog_errno(status);
1142                 goto out;
1143         }
1144
1145         /* Mark structure as allocated */
1146         status = ocfs2_modify_bh(lqinode, chunk->qc_headerbh, olq_alloc_dquot,
1147                                  &offset);
1148         if (status < 0) {
1149                 mlog_errno(status);
1150                 goto out;
1151         }
1152 out:
1153         return status;
1154 }
1155
1156 /* Create entry in local file for dquot, load data from the global file */
1157 static int ocfs2_local_read_dquot(struct dquot *dquot)
1158 {
1159         int status;
1160
1161         mlog_entry("id=%u, type=%d\n", dquot->dq_id, dquot->dq_type);
1162
1163         status = ocfs2_global_read_dquot(dquot);
1164         if (status < 0) {
1165                 mlog_errno(status);
1166                 goto out_err;
1167         }
1168
1169         /* Now create entry in the local quota file */
1170         status = ocfs2_create_local_dquot(dquot);
1171         if (status < 0) {
1172                 mlog_errno(status);
1173                 goto out_err;
1174         }
1175         mlog_exit(0);
1176         return 0;
1177 out_err:
1178         mlog_exit(status);
1179         return status;
1180 }
1181
1182 /* Release dquot structure from local quota file. ocfs2_release_dquot() has
1183  * already started a transaction and obtained exclusive lock for global
1184  * quota file. */
1185 static int ocfs2_local_release_dquot(struct dquot *dquot)
1186 {
1187         int status;
1188         int type = dquot->dq_type;
1189         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1190         struct super_block *sb = dquot->dq_sb;
1191         struct ocfs2_local_disk_chunk *dchunk;
1192         int offset;
1193         handle_t *handle = journal_current_handle();
1194
1195         BUG_ON(!handle);
1196         /* First write all local changes to global file */
1197         status = ocfs2_global_release_dquot(dquot);
1198         if (status < 0) {
1199                 mlog_errno(status);
1200                 goto out;
1201         }
1202
1203         status = ocfs2_journal_access(handle, sb_dqopt(sb)->files[type],
1204                         od->dq_chunk->qc_headerbh, OCFS2_JOURNAL_ACCESS_WRITE);
1205         if (status < 0) {
1206                 mlog_errno(status);
1207                 goto out;
1208         }
1209         offset = ol_dqblk_chunk_off(sb, od->dq_chunk->qc_num,
1210                                              od->dq_local_off);
1211         dchunk = (struct ocfs2_local_disk_chunk *)
1212                         (od->dq_chunk->qc_headerbh->b_data);
1213         /* Mark structure as freed */
1214         lock_buffer(od->dq_chunk->qc_headerbh);
1215         ocfs2_clear_bit(offset, dchunk->dqc_bitmap);
1216         le32_add_cpu(&dchunk->dqc_free, 1);
1217         unlock_buffer(od->dq_chunk->qc_headerbh);
1218         status = ocfs2_journal_dirty(handle, od->dq_chunk->qc_headerbh);
1219         if (status < 0) {
1220                 mlog_errno(status);
1221                 goto out;
1222         }
1223         status = 0;
1224 out:
1225         /* Clear the read bit so that next time someone uses this
1226          * dquot he reads fresh info from disk and allocates local
1227          * dquot structure */
1228         clear_bit(DQ_READ_B, &dquot->dq_flags);
1229         return status;
1230 }
1231
1232 static struct quota_format_ops ocfs2_format_ops = {
1233         .check_quota_file       = ocfs2_local_check_quota_file,
1234         .read_file_info         = ocfs2_local_read_info,
1235         .write_file_info        = ocfs2_global_write_info,
1236         .free_file_info         = ocfs2_local_free_info,
1237         .read_dqblk             = ocfs2_local_read_dquot,
1238         .commit_dqblk           = ocfs2_local_write_dquot,
1239         .release_dqblk          = ocfs2_local_release_dquot,
1240 };
1241
1242 struct quota_format_type ocfs2_quota_format = {
1243         .qf_fmt_id = QFMT_OCFS2,
1244         .qf_ops = &ocfs2_format_ops,
1245         .qf_owner = THIS_MODULE
1246 };