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   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), 1);
 105         if (IS_ERR(handle)) {
 106                 status = PTR_ERR(handle);
 107                 mlog_errno(status);
 108                 return status;
 109         }
 110         status = ocfs2_journal_access_dq(handle, inode, bh,
 111                                          OCFS2_JOURNAL_ACCESS_WRITE);
 112         if (status < 0) {
 113                 mlog_errno(status);
 114                 ocfs2_commit_trans(OCFS2_SB(sb), handle);
 115                 return status;
 116         }
 117         lock_buffer(bh);
 118         modify(bh, private);
 119         unlock_buffer(bh);
 120         status = ocfs2_journal_dirty(handle, bh);
 121         if (status < 0) {
 122                 mlog_errno(status);
 123                 ocfs2_commit_trans(OCFS2_SB(sb), handle);
 124                 return status;
 125         }
 126         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
 127         if (status < 0) {
 128                 mlog_errno(status);
 129                 return status;
 130         }
 131         return 0;
 132 }
 133
 134 /* Check whether we understand format of quota files */
 135 static int ocfs2_local_check_quota_file(struct super_block *sb, int type)
 136 {
 137         unsigned int lmagics[MAXQUOTAS] = OCFS2_LOCAL_QMAGICS;
 138         unsigned int lversions[MAXQUOTAS] = OCFS2_LOCAL_QVERSIONS;
 139         unsigned int gmagics[MAXQUOTAS] = OCFS2_GLOBAL_QMAGICS;
 140         unsigned int gversions[MAXQUOTAS] = OCFS2_GLOBAL_QVERSIONS;
 141         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 142                                         GROUP_QUOTA_SYSTEM_INODE };
 143         struct buffer_head *bh = NULL;
 144         struct inode *linode = sb_dqopt(sb)->files[type];
 145         struct inode *ginode = NULL;
 146         struct ocfs2_disk_dqheader *dqhead;
 147         int status, ret = 0;
 148
 149         /* First check whether we understand local quota file */
 150         status = ocfs2_read_quota_block(linode, 0, &bh);
 151         if (status) {
 152                 mlog_errno(status);
 153                 mlog(ML_ERROR, "failed to read quota file header (type=%d)\n",
 154                         type);
 155                 goto out_err;
 156         }
 157         dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
 158         if (le32_to_cpu(dqhead->dqh_magic) != lmagics[type]) {
 159                 mlog(ML_ERROR, "quota file magic does not match (%u != %u),"
 160                         " type=%d\n", le32_to_cpu(dqhead->dqh_magic),
 161                         lmagics[type], type);
 162                 goto out_err;
 163         }
 164         if (le32_to_cpu(dqhead->dqh_version) != lversions[type]) {
 165                 mlog(ML_ERROR, "quota file version does not match (%u != %u),"
 166                         " type=%d\n", le32_to_cpu(dqhead->dqh_version),
 167                         lversions[type], type);
 168                 goto out_err;
 169         }
 170         brelse(bh);
 171         bh = NULL;
 172
 173         /* Next check whether we understand global quota file */
 174         ginode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 175                                                 OCFS2_INVALID_SLOT);
 176         if (!ginode) {
 177                 mlog(ML_ERROR, "cannot get global quota file inode "
 178                                 "(type=%d)\n", type);
 179                 goto out_err;
 180         }
 181         /* Since the header is read only, we don't care about locking */
 182         status = ocfs2_read_quota_block(ginode, 0, &bh);
 183         if (status) {
 184                 mlog_errno(status);
 185                 mlog(ML_ERROR, "failed to read global quota file header "
 186                                 "(type=%d)\n", type);
 187                 goto out_err;
 188         }
 189         dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
 190         if (le32_to_cpu(dqhead->dqh_magic) != gmagics[type]) {
 191                 mlog(ML_ERROR, "global quota file magic does not match "
 192                         "(%u != %u), type=%d\n",
 193                         le32_to_cpu(dqhead->dqh_magic), gmagics[type], type);
 194                 goto out_err;
 195         }
 196         if (le32_to_cpu(dqhead->dqh_version) != gversions[type]) {
 197                 mlog(ML_ERROR, "global quota file version does not match "
 198                         "(%u != %u), type=%d\n",
 199                         le32_to_cpu(dqhead->dqh_version), gversions[type],
 200                         type);
 201                 goto out_err;
 202         }
 203
 204         ret = 1;
 205 out_err:
 206         brelse(bh);
 207         iput(ginode);
 208         return ret;
 209 }
 210
 211 /* Release given list of quota file chunks */
 212 static void ocfs2_release_local_quota_bitmaps(struct list_head *head)
 213 {
 214         struct ocfs2_quota_chunk *pos, *next;
 215
 216         list_for_each_entry_safe(pos, next, head, qc_chunk) {
 217                 list_del(&pos->qc_chunk);
 218                 brelse(pos->qc_headerbh);
 219                 kmem_cache_free(ocfs2_qf_chunk_cachep, pos);
 220         }
 221 }
 222
 223 /* Load quota bitmaps into memory */
 224 static int ocfs2_load_local_quota_bitmaps(struct inode *inode,
 225                         struct ocfs2_local_disk_dqinfo *ldinfo,
 226                         struct list_head *head)
 227 {
 228         struct ocfs2_quota_chunk *newchunk;
 229         int i, status;
 230
 231         INIT_LIST_HEAD(head);
 232         for (i = 0; i < le32_to_cpu(ldinfo->dqi_chunks); i++) {
 233                 newchunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
 234                 if (!newchunk) {
 235                         ocfs2_release_local_quota_bitmaps(head);
 236                         return -ENOMEM;
 237                 }
 238                 newchunk->qc_num = i;
 239                 newchunk->qc_headerbh = NULL;
 240                 status = ocfs2_read_quota_block(inode,
 241                                 ol_quota_chunk_block(inode->i_sb, i),
 242                                 &newchunk->qc_headerbh);
 243                 if (status) {
 244                         mlog_errno(status);
 245                         kmem_cache_free(ocfs2_qf_chunk_cachep, newchunk);
 246                         ocfs2_release_local_quota_bitmaps(head);
 247                         return status;
 248                 }
 249                 list_add_tail(&newchunk->qc_chunk, head);
 250         }
 251         return 0;
 252 }
 253
 254 static void olq_update_info(struct buffer_head *bh, void *private)
 255 {
 256         struct mem_dqinfo *info = private;
 257         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 258         struct ocfs2_local_disk_dqinfo *ldinfo;
 259
 260         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 261                                                 OCFS2_LOCAL_INFO_OFF);
 262         spin_lock(&dq_data_lock);
 263         ldinfo->dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
 264         ldinfo->dqi_chunks = cpu_to_le32(oinfo->dqi_chunks);
 265         ldinfo->dqi_blocks = cpu_to_le32(oinfo->dqi_blocks);
 266         spin_unlock(&dq_data_lock);
 267 }
 268
 269 static int ocfs2_add_recovery_chunk(struct super_block *sb,
 270                                     struct ocfs2_local_disk_chunk *dchunk,
 271                                     int chunk,
 272                                     struct list_head *head)
 273 {
 274         struct ocfs2_recovery_chunk *rc;
 275
 276         rc = kmalloc(sizeof(struct ocfs2_recovery_chunk), GFP_NOFS);
 277         if (!rc)
 278                 return -ENOMEM;
 279         rc->rc_chunk = chunk;
 280         rc->rc_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
 281         if (!rc->rc_bitmap) {
 282                 kfree(rc);
 283                 return -ENOMEM;
 284         }
 285         memcpy(rc->rc_bitmap, dchunk->dqc_bitmap,
 286                (ol_chunk_entries(sb) + 7) >> 3);
 287         list_add_tail(&rc->rc_list, head);
 288         return 0;
 289 }
 290
 291 static void free_recovery_list(struct list_head *head)
 292 {
 293         struct ocfs2_recovery_chunk *next;
 294         struct ocfs2_recovery_chunk *rchunk;
 295
 296         list_for_each_entry_safe(rchunk, next, head, rc_list) {
 297                 list_del(&rchunk->rc_list);
 298                 kfree(rchunk->rc_bitmap);
 299                 kfree(rchunk);
 300         }
 301 }
 302
 303 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec)
 304 {
 305         int type;
 306
 307         for (type = 0; type < MAXQUOTAS; type++)
 308                 free_recovery_list(&(rec->r_list[type]));
 309         kfree(rec);
 310 }
 311
 312 /* Load entries in our quota file we have to recover*/
 313 static int ocfs2_recovery_load_quota(struct inode *lqinode,
 314                                      struct ocfs2_local_disk_dqinfo *ldinfo,
 315                                      int type,
 316                                      struct list_head *head)
 317 {
 318         struct super_block *sb = lqinode->i_sb;
 319         struct buffer_head *hbh;
 320         struct ocfs2_local_disk_chunk *dchunk;
 321         int i, chunks = le32_to_cpu(ldinfo->dqi_chunks);
 322         int status = 0;
 323
 324         for (i = 0; i < chunks; i++) {
 325                 hbh = NULL;
 326                 status = ocfs2_read_quota_block(lqinode,
 327                                                 ol_quota_chunk_block(sb, i),
 328                                                 &hbh);
 329                 if (status) {
 330                         mlog_errno(status);
 331                         break;
 332                 }
 333                 dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
 334                 if (le32_to_cpu(dchunk->dqc_free) < ol_chunk_entries(sb))
 335                         status = ocfs2_add_recovery_chunk(sb, dchunk, i, head);
 336                 brelse(hbh);
 337                 if (status < 0)
 338                         break;
 339         }
 340         if (status < 0)
 341                 free_recovery_list(head);
 342         return status;
 343 }
 344
 345 static struct ocfs2_quota_recovery *ocfs2_alloc_quota_recovery(void)
 346 {
 347         int type;
 348         struct ocfs2_quota_recovery *rec;
 349
 350         rec = kmalloc(sizeof(struct ocfs2_quota_recovery), GFP_NOFS);
 351         if (!rec)
 352                 return NULL;
 353         for (type = 0; type < MAXQUOTAS; type++)
 354                 INIT_LIST_HEAD(&(rec->r_list[type]));
 355         return rec;
 356 }
 357
 358 /* Load information we need for quota recovery into memory */
 359 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
 360                                                 struct ocfs2_super *osb,
 361                                                 int slot_num)
 362 {
 363         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 364                                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 365         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 366                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 367         struct super_block *sb = osb->sb;
 368         struct ocfs2_local_disk_dqinfo *ldinfo;
 369         struct inode *lqinode;
 370         struct buffer_head *bh;
 371         int type;
 372         int status = 0;
 373         struct ocfs2_quota_recovery *rec;
 374
 375         mlog(ML_NOTICE, "Beginning quota recovery in slot %u\n", slot_num);
 376         rec = ocfs2_alloc_quota_recovery();
 377         if (!rec)
 378                 return ERR_PTR(-ENOMEM);
 379         /* First init... */
 380
 381         for (type = 0; type < MAXQUOTAS; type++) {
 382                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 383                         continue;
 384                 /* At this point, journal of the slot is already replayed so
 385                  * we can trust metadata and data of the quota file */
 386                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
 387                 if (!lqinode) {
 388                         status = -ENOENT;
 389                         goto out;
 390                 }
 391                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
 392                                                OCFS2_META_LOCK_RECOVERY);
 393                 if (status < 0) {
 394                         mlog_errno(status);
 395                         goto out_put;
 396                 }
 397                 /* Now read local header */
 398                 bh = NULL;
 399                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
 400                 if (status) {
 401                         mlog_errno(status);
 402                         mlog(ML_ERROR, "failed to read quota file info header "
 403                                 "(slot=%d type=%d)\n", slot_num, type);
 404                         goto out_lock;
 405                 }
 406                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 407                                                         OCFS2_LOCAL_INFO_OFF);
 408                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 409                                                    &rec->r_list[type]);
 410                 brelse(bh);
 411 out_lock:
 412                 ocfs2_inode_unlock(lqinode, 1);
 413 out_put:
 414                 iput(lqinode);
 415                 if (status < 0)
 416                         break;
 417         }
 418 out:
 419         if (status < 0) {
 420                 ocfs2_free_quota_recovery(rec);
 421                 rec = ERR_PTR(status);
 422         }
 423         return rec;
 424 }
 425
 426 /* Sync changes in local quota file into global quota file and
 427  * reinitialize local quota file.
 428  * The function expects local quota file to be already locked and
 429  * dqonoff_mutex locked. */
 430 static int ocfs2_recover_local_quota_file(struct inode *lqinode,
 431                                           int type,
 432                                           struct ocfs2_quota_recovery *rec)
 433 {
 434         struct super_block *sb = lqinode->i_sb;
 435         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 436         struct ocfs2_local_disk_chunk *dchunk;
 437         struct ocfs2_local_disk_dqblk *dqblk;
 438         struct dquot *dquot;
 439         handle_t *handle;
 440         struct buffer_head *hbh = NULL, *qbh = NULL;
 441         int status = 0;
 442         int bit, chunk;
 443         struct ocfs2_recovery_chunk *rchunk, *next;
 444         qsize_t spacechange, inodechange;
 445
 446         mlog_entry("ino=%lu type=%u", (unsigned long)lqinode->i_ino, type);
 447
 448         list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
 449                 chunk = rchunk->rc_chunk;
 450                 hbh = NULL;
 451                 status = ocfs2_read_quota_block(lqinode,
 452                                                 ol_quota_chunk_block(sb, chunk),
 453                                                 &hbh);
 454                 if (status) {
 455                         mlog_errno(status);
 456                         break;
 457                 }
 458                 dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
 459                 for_each_bit(bit, rchunk->rc_bitmap, ol_chunk_entries(sb)) {
 460                         qbh = NULL;
 461                         status = ocfs2_read_quota_block(lqinode,
 462                                                 ol_dqblk_block(sb, chunk, bit),
 463                                                 &qbh);
 464                         if (status) {
 465                                 mlog_errno(status);
 466                                 break;
 467                         }
 468                         dqblk = (struct ocfs2_local_disk_dqblk *)(qbh->b_data +
 469                                 ol_dqblk_block_off(sb, chunk, bit));
 470                         dquot = dqget(sb, le64_to_cpu(dqblk->dqb_id), type);
 471                         if (!dquot) {
 472                                 status = -EIO;
 473                                 mlog(ML_ERROR, "Failed to get quota structure "
 474                                      "for id %u, type %d. Cannot finish quota "
 475                                      "file recovery.\n",
 476                                      (unsigned)le64_to_cpu(dqblk->dqb_id),
 477                                      type);
 478                                 goto out_put_bh;
 479                         }
 480                         status = ocfs2_lock_global_qf(oinfo, 1);
 481                         if (status < 0) {
 482                                 mlog_errno(status);
 483                                 goto out_put_dquot;
 484                         }
 485
 486                         handle = ocfs2_start_trans(OCFS2_SB(sb),
 487                                                    OCFS2_QSYNC_CREDITS);
 488                         if (IS_ERR(handle)) {
 489                                 status = PTR_ERR(handle);
 490                                 mlog_errno(status);
 491                                 goto out_drop_lock;
 492                         }
 493                         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 494                         spin_lock(&dq_data_lock);
 495                         /* Add usage from quota entry into quota changes
 496                          * of our node. Auxiliary variables are important
 497                          * due to signedness */
 498                         spacechange = le64_to_cpu(dqblk->dqb_spacemod);
 499                         inodechange = le64_to_cpu(dqblk->dqb_inodemod);
 500                         dquot->dq_dqb.dqb_curspace += spacechange;
 501                         dquot->dq_dqb.dqb_curinodes += inodechange;
 502                         spin_unlock(&dq_data_lock);
 503                         /* We want to drop reference held by the crashed
 504                          * node. Since we have our own reference we know
 505                          * global structure actually won't be freed. */
 506                         status = ocfs2_global_release_dquot(dquot);
 507                         if (status < 0) {
 508                                 mlog_errno(status);
 509                                 goto out_commit;
 510                         }
 511                         /* Release local quota file entry */
 512                         status = ocfs2_journal_access_dq(handle, lqinode,
 513                                         qbh, OCFS2_JOURNAL_ACCESS_WRITE);
 514                         if (status < 0) {
 515                                 mlog_errno(status);
 516                                 goto out_commit;
 517                         }
 518                         lock_buffer(qbh);
 519                         WARN_ON(!ocfs2_test_bit(bit, dchunk->dqc_bitmap));
 520                         ocfs2_clear_bit(bit, dchunk->dqc_bitmap);
 521                         le32_add_cpu(&dchunk->dqc_free, 1);
 522                         unlock_buffer(qbh);
 523                         status = ocfs2_journal_dirty(handle, qbh);
 524                         if (status < 0)
 525                                 mlog_errno(status);
 526 out_commit:
 527                         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 528                         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 529 out_drop_lock:
 530                         ocfs2_unlock_global_qf(oinfo, 1);
 531 out_put_dquot:
 532                         dqput(dquot);
 533 out_put_bh:
 534                         brelse(qbh);
 535                         if (status < 0)
 536                                 break;
 537                 }
 538                 brelse(hbh);
 539                 list_del(&rchunk->rc_list);
 540                 kfree(rchunk->rc_bitmap);
 541                 kfree(rchunk);
 542                 if (status < 0)
 543                         break;
 544         }
 545         if (status < 0)
 546                 free_recovery_list(&(rec->r_list[type]));
 547         mlog_exit(status);
 548         return status;
 549 }
 550
 551 /* Recover local quota files for given node different from us */
 552 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
 553                                 struct ocfs2_quota_recovery *rec,
 554                                 int slot_num)
 555 {
 556         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 557                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 558         struct super_block *sb = osb->sb;
 559         struct ocfs2_local_disk_dqinfo *ldinfo;
 560         struct buffer_head *bh;
 561         handle_t *handle;
 562         int type;
 563         int status = 0;
 564         struct inode *lqinode;
 565         unsigned int flags;
 566
 567         mlog(ML_NOTICE, "Finishing quota recovery in slot %u\n", slot_num);
 568         mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
 569         for (type = 0; type < MAXQUOTAS; type++) {
 570                 if (list_empty(&(rec->r_list[type])))
 571                         continue;
 572                 mlog(0, "Recovering quota in slot %d\n", slot_num);
 573                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
 574                 if (!lqinode) {
 575                         status = -ENOENT;
 576                         goto out;
 577                 }
 578                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
 579                                                        OCFS2_META_LOCK_NOQUEUE);
 580                 /* Someone else is holding the lock? Then he must be
 581                  * doing the recovery. Just skip the file... */
 582                 if (status == -EAGAIN) {
 583                         mlog(ML_NOTICE, "skipping quota recovery for slot %d "
 584                              "because quota file is locked.\n", slot_num);
 585                         status = 0;
 586                         goto out_put;
 587                 } else if (status < 0) {
 588                         mlog_errno(status);
 589                         goto out_put;
 590                 }
 591                 /* Now read local header */
 592                 bh = NULL;
 593                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
 594                 if (status) {
 595                         mlog_errno(status);
 596                         mlog(ML_ERROR, "failed to read quota file info header "
 597                                 "(slot=%d type=%d)\n", slot_num, type);
 598                         goto out_lock;
 599                 }
 600                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 601                                                         OCFS2_LOCAL_INFO_OFF);
 602                 /* Is recovery still needed? */
 603                 flags = le32_to_cpu(ldinfo->dqi_flags);
 604                 if (!(flags & OLQF_CLEAN))
 605                         status = ocfs2_recover_local_quota_file(lqinode,
 606                                                                 type,
 607                                                                 rec);
 608                 /* We don't want to mark file as clean when it is actually
 609                  * active */
 610                 if (slot_num == osb->slot_num)
 611                         goto out_bh;
 612                 /* Mark quota file as clean if we are recovering quota file of
 613                  * some other node. */
 614                 handle = ocfs2_start_trans(osb, 1);
 615                 if (IS_ERR(handle)) {
 616                         status = PTR_ERR(handle);
 617                         mlog_errno(status);
 618                         goto out_bh;
 619                 }
 620                 status = ocfs2_journal_access_dq(handle, lqinode, bh,
 621                                                  OCFS2_JOURNAL_ACCESS_WRITE);
 622                 if (status < 0) {
 623                         mlog_errno(status);
 624                         goto out_trans;
 625                 }
 626                 lock_buffer(bh);
 627                 ldinfo->dqi_flags = cpu_to_le32(flags | OLQF_CLEAN);
 628                 unlock_buffer(bh);
 629                 status = ocfs2_journal_dirty(handle, bh);
 630                 if (status < 0)
 631                         mlog_errno(status);
 632 out_trans:
 633                 ocfs2_commit_trans(osb, handle);
 634 out_bh:
 635                 brelse(bh);
 636 out_lock:
 637                 ocfs2_inode_unlock(lqinode, 1);
 638 out_put:
 639                 iput(lqinode);
 640                 if (status < 0)
 641                         break;
 642         }
 643 out:
 644         mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 645         kfree(rec);
 646         return status;
 647 }
 648
 649 /* Read information header from quota file */
 650 static int ocfs2_local_read_info(struct super_block *sb, int type)
 651 {
 652         struct ocfs2_local_disk_dqinfo *ldinfo;
 653         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 654         struct ocfs2_mem_dqinfo *oinfo;
 655         struct inode *lqinode = sb_dqopt(sb)->files[type];
 656         int status;
 657         struct buffer_head *bh = NULL;
 658         struct ocfs2_quota_recovery *rec;
 659         int locked = 0;
 660
 661         /* We don't need the lock and we have to acquire quota file locks
 662          * which will later depend on this lock */
 663         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 664         info->dqi_maxblimit = 0x7fffffffffffffffLL;
 665         info->dqi_maxilimit = 0x7fffffffffffffffLL;
 666         oinfo = kmalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
 667         if (!oinfo) {
 668                 mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
 669                                " info.");
 670                 goto out_err;
 671         }
 672         info->dqi_priv = oinfo;
 673         oinfo->dqi_type = type;
 674         INIT_LIST_HEAD(&oinfo->dqi_chunk);
 675         oinfo->dqi_rec = NULL;
 676         oinfo->dqi_lqi_bh = NULL;
 677         oinfo->dqi_ibh = NULL;
 678
 679         status = ocfs2_global_read_info(sb, type);
 680         if (status < 0)
 681                 goto out_err;
 682
 683         status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
 684         if (status < 0) {
 685                 mlog_errno(status);
 686                 goto out_err;
 687         }
 688         locked = 1;
 689
 690         /* Now read local header */
 691         status = ocfs2_read_quota_block(lqinode, 0, &bh);
 692         if (status) {
 693                 mlog_errno(status);
 694                 mlog(ML_ERROR, "failed to read quota file info header "
 695                         "(type=%d)\n", type);
 696                 goto out_err;
 697         }
 698         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 699                                                 OCFS2_LOCAL_INFO_OFF);
 700         info->dqi_flags = le32_to_cpu(ldinfo->dqi_flags);
 701         oinfo->dqi_chunks = le32_to_cpu(ldinfo->dqi_chunks);
 702         oinfo->dqi_blocks = le32_to_cpu(ldinfo->dqi_blocks);
 703         oinfo->dqi_ibh = bh;
 704
 705         /* We crashed when using local quota file? */
 706         if (!(info->dqi_flags & OLQF_CLEAN)) {
 707                 rec = OCFS2_SB(sb)->quota_rec;
 708                 if (!rec) {
 709                         rec = ocfs2_alloc_quota_recovery();
 710                         if (!rec) {
 711                                 status = -ENOMEM;
 712                                 mlog_errno(status);
 713                                 goto out_err;
 714                         }
 715                         OCFS2_SB(sb)->quota_rec = rec;
 716                 }
 717
 718                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 719                                                    &rec->r_list[type]);
 720                 if (status < 0) {
 721                         mlog_errno(status);
 722                         goto out_err;
 723                 }
 724         }
 725
 726         status = ocfs2_load_local_quota_bitmaps(lqinode,
 727                                                 ldinfo,
 728                                                 &oinfo->dqi_chunk);
 729         if (status < 0) {
 730                 mlog_errno(status);
 731                 goto out_err;
 732         }
 733
 734         /* Now mark quota file as used */
 735         info->dqi_flags &= ~OLQF_CLEAN;
 736         status = ocfs2_modify_bh(lqinode, bh, olq_update_info, info);
 737         if (status < 0) {
 738                 mlog_errno(status);
 739                 goto out_err;
 740         }
 741
 742         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 743         return 0;
 744 out_err:
 745         if (oinfo) {
 746                 iput(oinfo->dqi_gqinode);
 747                 ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 748                 ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 749                 brelse(oinfo->dqi_lqi_bh);
 750                 if (locked)
 751                         ocfs2_inode_unlock(lqinode, 1);
 752                 ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 753                 kfree(oinfo);
 754         }
 755         brelse(bh);
 756         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 757         return -1;
 758 }
 759
 760 /* Write local info to quota file */
 761 static int ocfs2_local_write_info(struct super_block *sb, int type)
 762 {
 763         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 764         struct buffer_head *bh = ((struct ocfs2_mem_dqinfo *)info->dqi_priv)
 765                                                 ->dqi_ibh;
 766         int status;
 767
 768         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type], bh, olq_update_info,
 769                                  info);
 770         if (status < 0) {
 771                 mlog_errno(status);
 772                 return -1;
 773         }
 774
 775         return 0;
 776 }
 777
 778 /* Release info from memory */
 779 static int ocfs2_local_free_info(struct super_block *sb, int type)
 780 {
 781         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 782         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 783         struct ocfs2_quota_chunk *chunk;
 784         struct ocfs2_local_disk_chunk *dchunk;
 785         int mark_clean = 1, len;
 786         int status;
 787
 788         /* At this point we know there are no more dquots and thus
 789          * even if there's some sync in the pdflush queue, it won't
 790          * find any dquots and return without doing anything */
 791         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 792         iput(oinfo->dqi_gqinode);
 793         ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 794         ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 795         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 796                 dchunk = (struct ocfs2_local_disk_chunk *)
 797                                         (chunk->qc_headerbh->b_data);
 798                 if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 799                         len = ol_chunk_entries(sb);
 800                 } else {
 801                         len = (oinfo->dqi_blocks -
 802                                ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 803                               * ol_quota_entries_per_block(sb);
 804                 }
 805                 /* Not all entries free? Bug! */
 806                 if (le32_to_cpu(dchunk->dqc_free) != len) {
 807                         mlog(ML_ERROR, "releasing quota file with used "
 808                                         "entries (type=%d)\n", type);
 809                         mark_clean = 0;
 810                 }
 811         }
 812         ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 813
 814         /* dqonoff_mutex protects us against racing with recovery thread... */
 815         if (oinfo->dqi_rec) {
 816                 ocfs2_free_quota_recovery(oinfo->dqi_rec);
 817                 mark_clean = 0;
 818         }
 819
 820         if (!mark_clean)
 821                 goto out;
 822
 823         /* Mark local file as clean */
 824         info->dqi_flags |= OLQF_CLEAN;
 825         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type],
 826                                  oinfo->dqi_ibh,
 827                                  olq_update_info,
 828                                  info);
 829         if (status < 0) {
 830                 mlog_errno(status);
 831                 goto out;
 832         }
 833
 834 out:
 835         ocfs2_inode_unlock(sb_dqopt(sb)->files[type], 1);
 836         brelse(oinfo->dqi_ibh);
 837         brelse(oinfo->dqi_lqi_bh);
 838         kfree(oinfo);
 839         return 0;
 840 }
 841
 842 static void olq_set_dquot(struct buffer_head *bh, void *private)
 843 {
 844         struct ocfs2_dquot *od = private;
 845         struct ocfs2_local_disk_dqblk *dqblk;
 846         struct super_block *sb = od->dq_dquot.dq_sb;
 847
 848         dqblk = (struct ocfs2_local_disk_dqblk *)(bh->b_data
 849                 + ol_dqblk_block_offset(sb, od->dq_local_off));
 850
 851         dqblk->dqb_id = cpu_to_le64(od->dq_dquot.dq_id);
 852         spin_lock(&dq_data_lock);
 853         dqblk->dqb_spacemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curspace -
 854                                           od->dq_origspace);
 855         dqblk->dqb_inodemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curinodes -
 856                                           od->dq_originodes);
 857         spin_unlock(&dq_data_lock);
 858         mlog(0, "Writing local dquot %u space %lld inodes %lld\n",
 859              od->dq_dquot.dq_id, (long long)le64_to_cpu(dqblk->dqb_spacemod),
 860              (long long)le64_to_cpu(dqblk->dqb_inodemod));
 861 }
 862
 863 /* Write dquot to local quota file */
 864 static int ocfs2_local_write_dquot(struct dquot *dquot)
 865 {
 866         struct super_block *sb = dquot->dq_sb;
 867         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
 868         struct buffer_head *bh = NULL;
 869         int status;
 870
 871         status = ocfs2_read_quota_block(sb_dqopt(sb)->files[dquot->dq_type],
 872                                     ol_dqblk_file_block(sb, od->dq_local_off),
 873                                     &bh);
 874         if (status) {
 875                 mlog_errno(status);
 876                 goto out;
 877         }
 878         status = ocfs2_modify_bh(sb_dqopt(sb)->files[dquot->dq_type], bh,
 879                                  olq_set_dquot, od);
 880         if (status < 0) {
 881                 mlog_errno(status);
 882                 goto out;
 883         }
 884 out:
 885         brelse(bh);
 886         return status;
 887 }
 888
 889 /* Find free entry in local quota file */
 890 static struct ocfs2_quota_chunk *ocfs2_find_free_entry(struct super_block *sb,
 891                                                        int type,
 892                                                        int *offset)
 893 {
 894         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 895         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 896         struct ocfs2_quota_chunk *chunk;
 897         struct ocfs2_local_disk_chunk *dchunk;
 898         int found = 0, len;
 899
 900         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 901                 dchunk = (struct ocfs2_local_disk_chunk *)
 902                                                 chunk->qc_headerbh->b_data;
 903                 if (le32_to_cpu(dchunk->dqc_free) > 0) {
 904                         found = 1;
 905                         break;
 906                 }
 907         }
 908         if (!found)
 909                 return NULL;
 910
 911         if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 912                 len = ol_chunk_entries(sb);
 913         } else {
 914                 len = (oinfo->dqi_blocks -
 915                        ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 916                       * ol_quota_entries_per_block(sb);
 917         }
 918
 919         found = ocfs2_find_next_zero_bit(dchunk->dqc_bitmap, len, 0);
 920         /* We failed? */
 921         if (found == len) {
 922                 mlog(ML_ERROR, "Did not find empty entry in chunk %d with %u"
 923                      " entries free (type=%d)\n", chunk->qc_num,
 924                      le32_to_cpu(dchunk->dqc_free), type);
 925                 return ERR_PTR(-EIO);
 926         }
 927         *offset = found;
 928         return chunk;
 929 }
 930
 931 /* Add new chunk to the local quota file */
 932 static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
 933                                                         struct super_block *sb,
 934                                                         int type,
 935                                                         int *offset)
 936 {
 937         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 938         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 939         struct inode *lqinode = sb_dqopt(sb)->files[type];
 940         struct ocfs2_quota_chunk *chunk = NULL;
 941         struct ocfs2_local_disk_chunk *dchunk;
 942         int status;
 943         handle_t *handle;
 944         struct buffer_head *bh = NULL, *dbh = NULL;
 945         u64 p_blkno;
 946
 947         /* We are protected by dqio_sem so no locking needed */
 948         status = ocfs2_extend_no_holes(lqinode,
 949                                        lqinode->i_size + 2 * sb->s_blocksize,
 950                                        lqinode->i_size);
 951         if (status < 0) {
 952                 mlog_errno(status);
 953                 goto out;
 954         }
 955         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
 956                                           lqinode->i_size + 2 * sb->s_blocksize);
 957         if (status < 0) {
 958                 mlog_errno(status);
 959                 goto out;
 960         }
 961
 962         chunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
 963         if (!chunk) {
 964                 status = -ENOMEM;
 965                 mlog_errno(status);
 966                 goto out;
 967         }
 968         handle = ocfs2_start_trans(OCFS2_SB(sb), 3);
 969         if (IS_ERR(handle)) {
 970                 status = PTR_ERR(handle);
 971                 mlog_errno(status);
 972                 goto out;
 973         }
 974
 975         /* Initialize chunk header */
 976         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
 977         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
 978                                              &p_blkno, NULL, NULL);
 979         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
 980         if (status < 0) {
 981                 mlog_errno(status);
 982                 goto out_trans;
 983         }
 984         bh = sb_getblk(sb, p_blkno);
 985         if (!bh) {
 986                 status = -ENOMEM;
 987                 mlog_errno(status);
 988                 goto out_trans;
 989         }
 990         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
 991         ocfs2_set_new_buffer_uptodate(lqinode, bh);
 992         status = ocfs2_journal_access_dq(handle, lqinode, bh,
 993                                          OCFS2_JOURNAL_ACCESS_CREATE);
 994         if (status < 0) {
 995                 mlog_errno(status);
 996                 goto out_trans;
 997         }
 998         lock_buffer(bh);
 999         dchunk->dqc_free = cpu_to_le32(ol_quota_entries_per_block(sb));
1000         memset(dchunk->dqc_bitmap, 0,
1001                sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
1002                OCFS2_QBLK_RESERVED_SPACE);
1003         unlock_buffer(bh);
1004         status = ocfs2_journal_dirty(handle, bh);
1005         if (status < 0) {
1006                 mlog_errno(status);
1007                 goto out_trans;
1008         }
1009
1010         /* Initialize new block with structures */
1011         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1012         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks + 1,
1013                                              &p_blkno, NULL, NULL);
1014         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1015         if (status < 0) {
1016                 mlog_errno(status);
1017                 goto out_trans;
1018         }
1019         dbh = sb_getblk(sb, p_blkno);
1020         if (!dbh) {
1021                 status = -ENOMEM;
1022                 mlog_errno(status);
1023                 goto out_trans;
1024         }
1025         ocfs2_set_new_buffer_uptodate(lqinode, dbh);
1026         status = ocfs2_journal_access_dq(handle, lqinode, dbh,
1027                                          OCFS2_JOURNAL_ACCESS_CREATE);
1028         if (status < 0) {
1029                 mlog_errno(status);
1030                 goto out_trans;
1031         }
1032         lock_buffer(dbh);
1033         memset(dbh->b_data, 0, sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE);
1034         unlock_buffer(dbh);
1035         status = ocfs2_journal_dirty(handle, dbh);
1036         if (status < 0) {
1037                 mlog_errno(status);
1038                 goto out_trans;
1039         }
1040
1041         /* Update local quotafile info */
1042         oinfo->dqi_blocks += 2;
1043         oinfo->dqi_chunks++;
1044         status = ocfs2_local_write_info(sb, type);
1045         if (status < 0) {
1046                 mlog_errno(status);
1047                 goto out_trans;
1048         }
1049         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1050         if (status < 0) {
1051                 mlog_errno(status);
1052                 goto out;
1053         }
1054
1055         list_add_tail(&chunk->qc_chunk, &oinfo->dqi_chunk);
1056         chunk->qc_num = list_entry(chunk->qc_chunk.prev,
1057                                    struct ocfs2_quota_chunk,
1058                                    qc_chunk)->qc_num + 1;
1059         chunk->qc_headerbh = bh;
1060         *offset = 0;
1061         return chunk;
1062 out_trans:
1063         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1064 out:
1065         brelse(bh);
1066         brelse(dbh);
1067         kmem_cache_free(ocfs2_qf_chunk_cachep, chunk);
1068         return ERR_PTR(status);
1069 }
1070
1071 /* Find free entry in local quota file */
1072 static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
1073                                                        struct super_block *sb,
1074                                                        int type,
1075                                                        int *offset)
1076 {
1077         struct mem_dqinfo *info = sb_dqinfo(sb, type);
1078         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
1079         struct ocfs2_quota_chunk *chunk;
1080         struct inode *lqinode = sb_dqopt(sb)->files[type];
1081         struct ocfs2_local_disk_chunk *dchunk;
1082         int epb = ol_quota_entries_per_block(sb);
1083         unsigned int chunk_blocks;
1084         struct buffer_head *bh;
1085         u64 p_blkno;
1086         int status;
1087         handle_t *handle;
1088
1089         if (list_empty(&oinfo->dqi_chunk))
1090                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1091         /* Is the last chunk full? */
1092         chunk = list_entry(oinfo->dqi_chunk.prev,
1093                         struct ocfs2_quota_chunk, qc_chunk);
1094         chunk_blocks = oinfo->dqi_blocks -
1095                         ol_quota_chunk_block(sb, chunk->qc_num) - 1;
1096         if (ol_chunk_blocks(sb) == chunk_blocks)
1097                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1098
1099         /* We are protected by dqio_sem so no locking needed */
1100         status = ocfs2_extend_no_holes(lqinode,
1101                                        lqinode->i_size + sb->s_blocksize,
1102                                        lqinode->i_size);
1103         if (status < 0) {
1104                 mlog_errno(status);
1105                 goto out;
1106         }
1107         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
1108                                           lqinode->i_size + sb->s_blocksize);
1109         if (status < 0) {
1110                 mlog_errno(status);
1111                 goto out;
1112         }
1113
1114         /* Get buffer from the just added block */
1115         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1116         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
1117                                              &p_blkno, NULL, NULL);
1118         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1119         if (status < 0) {
1120                 mlog_errno(status);
1121                 goto out;
1122         }
1123         bh = sb_getblk(sb, p_blkno);
1124         if (!bh) {
1125                 status = -ENOMEM;
1126                 mlog_errno(status);
1127                 goto out;
1128         }
1129         ocfs2_set_new_buffer_uptodate(lqinode, bh);
1130
1131         handle = ocfs2_start_trans(OCFS2_SB(sb), 3);
1132         if (IS_ERR(handle)) {
1133                 status = PTR_ERR(handle);
1134                 mlog_errno(status);
1135                 goto out;
1136         }
1137         /* Zero created block */
1138         status = ocfs2_journal_access_dq(handle, lqinode, bh,
1139                                  OCFS2_JOURNAL_ACCESS_CREATE);
1140         if (status < 0) {
1141                 mlog_errno(status);
1142                 goto out_trans;
1143         }
1144         lock_buffer(bh);
1145         memset(bh->b_data, 0, sb->s_blocksize);
1146         unlock_buffer(bh);
1147         status = ocfs2_journal_dirty(handle, bh);
1148         if (status < 0) {
1149                 mlog_errno(status);
1150                 goto out_trans;
1151         }
1152         /* Update chunk header */
1153         status = ocfs2_journal_access_dq(handle, lqinode, chunk->qc_headerbh,
1154                                  OCFS2_JOURNAL_ACCESS_WRITE);
1155         if (status < 0) {
1156                 mlog_errno(status);
1157                 goto out_trans;
1158         }
1159
1160         dchunk = (struct ocfs2_local_disk_chunk *)chunk->qc_headerbh->b_data;
1161         lock_buffer(chunk->qc_headerbh);
1162         le32_add_cpu(&dchunk->dqc_free, ol_quota_entries_per_block(sb));
1163         unlock_buffer(chunk->qc_headerbh);
1164         status = ocfs2_journal_dirty(handle, chunk->qc_headerbh);
1165         if (status < 0) {
1166                 mlog_errno(status);
1167                 goto out_trans;
1168         }
1169         /* Update file header */
1170         oinfo->dqi_blocks++;
1171         status = ocfs2_local_write_info(sb, type);
1172         if (status < 0) {
1173                 mlog_errno(status);
1174                 goto out_trans;
1175         }
1176
1177         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1178         if (status < 0) {
1179                 mlog_errno(status);
1180                 goto out;
1181         }
1182         *offset = chunk_blocks * epb;
1183         return chunk;
1184 out_trans:
1185         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1186 out:
1187         return ERR_PTR(status);
1188 }
1189
1190 static void olq_alloc_dquot(struct buffer_head *bh, void *private)
1191 {
1192         int *offset = private;
1193         struct ocfs2_local_disk_chunk *dchunk;
1194
1195         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
1196         ocfs2_set_bit(*offset, dchunk->dqc_bitmap);
1197         le32_add_cpu(&dchunk->dqc_free, -1);
1198 }
1199
1200 /* Create dquot in the local file for given id */
1201 static int ocfs2_create_local_dquot(struct dquot *dquot)
1202 {
1203         struct super_block *sb = dquot->dq_sb;
1204         int type = dquot->dq_type;
1205         struct inode *lqinode = sb_dqopt(sb)->files[type];
1206         struct ocfs2_quota_chunk *chunk;
1207         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1208         int offset;
1209         int status;
1210
1211         chunk = ocfs2_find_free_entry(sb, type, &offset);
1212         if (!chunk) {
1213                 chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
1214                 if (IS_ERR(chunk))
1215                         return PTR_ERR(chunk);
1216         } else if (IS_ERR(chunk)) {
1217                 return PTR_ERR(chunk);
1218         }
1219         od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
1220         od->dq_chunk = chunk;
1221
1222         /* Initialize dquot structure on disk */
1223         status = ocfs2_local_write_dquot(dquot);
1224         if (status < 0) {
1225                 mlog_errno(status);
1226                 goto out;
1227         }
1228
1229         /* Mark structure as allocated */
1230         status = ocfs2_modify_bh(lqinode, chunk->qc_headerbh, olq_alloc_dquot,
1231                                  &offset);
1232         if (status < 0) {
1233                 mlog_errno(status);
1234                 goto out;
1235         }
1236 out:
1237         return status;
1238 }
1239
1240 /* Create entry in local file for dquot, load data from the global file */
1241 static int ocfs2_local_read_dquot(struct dquot *dquot)
1242 {
1243         int status;
1244
1245         mlog_entry("id=%u, type=%d\n", dquot->dq_id, dquot->dq_type);
1246
1247         status = ocfs2_global_read_dquot(dquot);
1248         if (status < 0) {
1249                 mlog_errno(status);
1250                 goto out_err;
1251         }
1252
1253         /* Now create entry in the local quota file */
1254         status = ocfs2_create_local_dquot(dquot);
1255         if (status < 0) {
1256                 mlog_errno(status);
1257                 goto out_err;
1258         }
1259         mlog_exit(0);
1260         return 0;
1261 out_err:
1262         mlog_exit(status);
1263         return status;
1264 }
1265
1266 /* Release dquot structure from local quota file. ocfs2_release_dquot() has
1267  * already started a transaction and obtained exclusive lock for global
1268  * quota file. */
1269 static int ocfs2_local_release_dquot(struct dquot *dquot)
1270 {
1271         int status;
1272         int type = dquot->dq_type;
1273         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1274         struct super_block *sb = dquot->dq_sb;
1275         struct ocfs2_local_disk_chunk *dchunk;
1276         int offset;
1277         handle_t *handle = journal_current_handle();
1278
1279         BUG_ON(!handle);
1280         /* First write all local changes to global file */
1281         status = ocfs2_global_release_dquot(dquot);
1282         if (status < 0) {
1283                 mlog_errno(status);
1284                 goto out;
1285         }
1286
1287         status = ocfs2_journal_access_dq(handle, sb_dqopt(sb)->files[type],
1288                         od->dq_chunk->qc_headerbh, OCFS2_JOURNAL_ACCESS_WRITE);
1289         if (status < 0) {
1290                 mlog_errno(status);
1291                 goto out;
1292         }
1293         offset = ol_dqblk_chunk_off(sb, od->dq_chunk->qc_num,
1294                                              od->dq_local_off);
1295         dchunk = (struct ocfs2_local_disk_chunk *)
1296                         (od->dq_chunk->qc_headerbh->b_data);
1297         /* Mark structure as freed */
1298         lock_buffer(od->dq_chunk->qc_headerbh);
1299         ocfs2_clear_bit(offset, dchunk->dqc_bitmap);
1300         le32_add_cpu(&dchunk->dqc_free, 1);
1301         unlock_buffer(od->dq_chunk->qc_headerbh);
1302         status = ocfs2_journal_dirty(handle, od->dq_chunk->qc_headerbh);
1303         if (status < 0) {
1304                 mlog_errno(status);
1305                 goto out;
1306         }
1307         status = 0;
1308 out:
1309         /* Clear the read bit so that next time someone uses this
1310          * dquot he reads fresh info from disk and allocates local
1311          * dquot structure */
1312         clear_bit(DQ_READ_B, &dquot->dq_flags);
1313         return status;
1314 }
1315
1316 static struct quota_format_ops ocfs2_format_ops = {
1317         .check_quota_file       = ocfs2_local_check_quota_file,
1318         .read_file_info         = ocfs2_local_read_info,
1319         .write_file_info        = ocfs2_global_write_info,
1320         .free_file_info         = ocfs2_local_free_info,
1321         .read_dqblk             = ocfs2_local_read_dquot,
1322         .commit_dqblk           = ocfs2_local_write_dquot,
1323         .release_dqblk          = ocfs2_local_release_dquot,
1324 };
1325
1326 struct quota_format_type ocfs2_quota_format = {
1327         .qf_fmt_id = QFMT_OCFS2,
1328         .qf_ops = &ocfs2_format_ops,
1329         .qf_owner = THIS_MODULE
1330 };