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