fs/ocfs2/quota_local.c

   1 /*
   2  *  Implementation of operations over local quota file
   3  */
   4
   5 #include <linux/fs.h>
   6 #include <linux/slab.h>
   7 #include <linux/quota.h>
   8 #include <linux/quotaops.h>
   9 #include <linux/module.h>
  10
  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 #include "super.h"
  25 #include "ocfs2_trace.h"
  26
  27 /* Number of local quota structures per block */
  28 static inline unsigned int ol_quota_entries_per_block(struct super_block *sb)
  29 {
  30         return ((sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) /
  31                 sizeof(struct ocfs2_local_disk_dqblk));
  32 }
  33
  34 /* Number of blocks with entries in one chunk */
  35 static inline unsigned int ol_chunk_blocks(struct super_block *sb)
  36 {
  37         return ((sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
  38                  OCFS2_QBLK_RESERVED_SPACE) << 3) /
  39                ol_quota_entries_per_block(sb);
  40 }
  41
  42 /* Number of entries in a chunk bitmap */
  43 static unsigned int ol_chunk_entries(struct super_block *sb)
  44 {
  45         return ol_chunk_blocks(sb) * ol_quota_entries_per_block(sb);
  46 }
  47
  48 /* Offset of the chunk in quota file */
  49 static unsigned int ol_quota_chunk_block(struct super_block *sb, int c)
  50 {
  51         /* 1 block for local quota file info, 1 block per chunk for chunk info */
  52         return 1 + (ol_chunk_blocks(sb) + 1) * c;
  53 }
  54
  55 static unsigned int ol_dqblk_block(struct super_block *sb, int c, int off)
  56 {
  57         int epb = ol_quota_entries_per_block(sb);
  58
  59         return ol_quota_chunk_block(sb, c) + 1 + off / epb;
  60 }
  61
  62 static unsigned int ol_dqblk_block_off(struct super_block *sb, int c, int off)
  63 {
  64         int epb = ol_quota_entries_per_block(sb);
  65
  66         return (off % epb) * sizeof(struct ocfs2_local_disk_dqblk);
  67 }
  68
  69 /* Offset of the dquot structure in the quota file */
  70 static loff_t ol_dqblk_off(struct super_block *sb, int c, int off)
  71 {
  72         return (ol_dqblk_block(sb, c, off) << sb->s_blocksize_bits) +
  73                ol_dqblk_block_off(sb, c, off);
  74 }
  75
  76 /* Compute block number from given offset */
  77 static inline unsigned int ol_dqblk_file_block(struct super_block *sb, loff_t off)
  78 {
  79         return off >> sb->s_blocksize_bits;
  80 }
  81
  82 static inline unsigned int ol_dqblk_block_offset(struct super_block *sb, loff_t off)
  83 {
  84         return off & ((1 << sb->s_blocksize_bits) - 1);
  85 }
  86
  87 /* Compute offset in the chunk of a structure with the given offset */
  88 static int ol_dqblk_chunk_off(struct super_block *sb, int c, loff_t off)
  89 {
  90         int epb = ol_quota_entries_per_block(sb);
  91
  92         return ((off >> sb->s_blocksize_bits) -
  93                         ol_quota_chunk_block(sb, c) - 1) * epb
  94                + ((unsigned int)(off & ((1 << sb->s_blocksize_bits) - 1))) /
  95                  sizeof(struct ocfs2_local_disk_dqblk);
  96 }
  97
  98 /* Write bufferhead into the fs */
  99 static int ocfs2_modify_bh(struct inode *inode, struct buffer_head *bh,
 100                 void (*modify)(struct buffer_head *, void *), void *private)
 101 {
 102         struct super_block *sb = inode->i_sb;
 103         handle_t *handle;
 104         int status;
 105
 106         handle = ocfs2_start_trans(OCFS2_SB(sb),
 107                                    OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
 108         if (IS_ERR(handle)) {
 109                 status = PTR_ERR(handle);
 110                 mlog_errno(status);
 111                 return status;
 112         }
 113         status = ocfs2_journal_access_dq(handle, INODE_CACHE(inode), bh,
 114                                          OCFS2_JOURNAL_ACCESS_WRITE);
 115         if (status < 0) {
 116                 mlog_errno(status);
 117                 ocfs2_commit_trans(OCFS2_SB(sb), handle);
 118                 return status;
 119         }
 120         lock_buffer(bh);
 121         modify(bh, private);
 122         unlock_buffer(bh);
 123         ocfs2_journal_dirty(handle, bh);
 124
 125         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
 126         if (status < 0) {
 127                 mlog_errno(status);
 128                 return status;
 129         }
 130         return 0;
 131 }
 132
 133 /*
 134  * Read quota block from a given logical offset.
 135  *
 136  * This function acquires ip_alloc_sem and thus it must not be called with a
 137  * transaction started.
 138  */
 139 static int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
 140                                   struct buffer_head **bh)
 141 {
 142         int rc = 0;
 143         struct buffer_head *tmp = *bh;
 144
 145         if (i_size_read(inode) >> inode->i_sb->s_blocksize_bits <= v_block) {
 146                 ocfs2_error(inode->i_sb,
 147                             "Quota file %llu is probably corrupted! Requested "
 148                             "to read block %Lu but file has size only %Lu\n",
 149                             (unsigned long long)OCFS2_I(inode)->ip_blkno,
 150                             (unsigned long long)v_block,
 151                             (unsigned long long)i_size_read(inode));
 152                 return -EIO;
 153         }
 154         rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, 0,
 155                                     ocfs2_validate_quota_block);
 156         if (rc)
 157                 mlog_errno(rc);
 158
 159         /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
 160         if (!rc && !*bh)
 161                 *bh = tmp;
 162
 163         return rc;
 164 }
 165
 166 /* Check whether we understand format of quota files */
 167 static int ocfs2_local_check_quota_file(struct super_block *sb, int type)
 168 {
 169         unsigned int lmagics[MAXQUOTAS] = OCFS2_LOCAL_QMAGICS;
 170         unsigned int lversions[MAXQUOTAS] = OCFS2_LOCAL_QVERSIONS;
 171         unsigned int gmagics[MAXQUOTAS] = OCFS2_GLOBAL_QMAGICS;
 172         unsigned int gversions[MAXQUOTAS] = OCFS2_GLOBAL_QVERSIONS;
 173         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 174                                         GROUP_QUOTA_SYSTEM_INODE };
 175         struct buffer_head *bh = NULL;
 176         struct inode *linode = sb_dqopt(sb)->files[type];
 177         struct inode *ginode = NULL;
 178         struct ocfs2_disk_dqheader *dqhead;
 179         int status, ret = 0;
 180
 181         /* First check whether we understand local quota file */
 182         status = ocfs2_read_quota_block(linode, 0, &bh);
 183         if (status) {
 184                 mlog_errno(status);
 185                 mlog(ML_ERROR, "failed to read quota file header (type=%d)\n",
 186                         type);
 187                 goto out_err;
 188         }
 189         dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
 190         if (le32_to_cpu(dqhead->dqh_magic) != lmagics[type]) {
 191                 mlog(ML_ERROR, "quota file magic does not match (%u != %u),"
 192                         " type=%d\n", le32_to_cpu(dqhead->dqh_magic),
 193                         lmagics[type], type);
 194                 goto out_err;
 195         }
 196         if (le32_to_cpu(dqhead->dqh_version) != lversions[type]) {
 197                 mlog(ML_ERROR, "quota file version does not match (%u != %u),"
 198                         " type=%d\n", le32_to_cpu(dqhead->dqh_version),
 199                         lversions[type], type);
 200                 goto out_err;
 201         }
 202         brelse(bh);
 203         bh = NULL;
 204
 205         /* Next check whether we understand global quota file */
 206         ginode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 207                                                 OCFS2_INVALID_SLOT);
 208         if (!ginode) {
 209                 mlog(ML_ERROR, "cannot get global quota file inode "
 210                                 "(type=%d)\n", type);
 211                 goto out_err;
 212         }
 213         /* Since the header is read only, we don't care about locking */
 214         status = ocfs2_read_quota_block(ginode, 0, &bh);
 215         if (status) {
 216                 mlog_errno(status);
 217                 mlog(ML_ERROR, "failed to read global quota file header "
 218                                 "(type=%d)\n", type);
 219                 goto out_err;
 220         }
 221         dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
 222         if (le32_to_cpu(dqhead->dqh_magic) != gmagics[type]) {
 223                 mlog(ML_ERROR, "global quota file magic does not match "
 224                         "(%u != %u), type=%d\n",
 225                         le32_to_cpu(dqhead->dqh_magic), gmagics[type], type);
 226                 goto out_err;
 227         }
 228         if (le32_to_cpu(dqhead->dqh_version) != gversions[type]) {
 229                 mlog(ML_ERROR, "global quota file version does not match "
 230                         "(%u != %u), type=%d\n",
 231                         le32_to_cpu(dqhead->dqh_version), gversions[type],
 232                         type);
 233                 goto out_err;
 234         }
 235
 236         ret = 1;
 237 out_err:
 238         brelse(bh);
 239         iput(ginode);
 240         return ret;
 241 }
 242
 243 /* Release given list of quota file chunks */
 244 static void ocfs2_release_local_quota_bitmaps(struct list_head *head)
 245 {
 246         struct ocfs2_quota_chunk *pos, *next;
 247
 248         list_for_each_entry_safe(pos, next, head, qc_chunk) {
 249                 list_del(&pos->qc_chunk);
 250                 brelse(pos->qc_headerbh);
 251                 kmem_cache_free(ocfs2_qf_chunk_cachep, pos);
 252         }
 253 }
 254
 255 /* Load quota bitmaps into memory */
 256 static int ocfs2_load_local_quota_bitmaps(struct inode *inode,
 257                         struct ocfs2_local_disk_dqinfo *ldinfo,
 258                         struct list_head *head)
 259 {
 260         struct ocfs2_quota_chunk *newchunk;
 261         int i, status;
 262
 263         INIT_LIST_HEAD(head);
 264         for (i = 0; i < le32_to_cpu(ldinfo->dqi_chunks); i++) {
 265                 newchunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
 266                 if (!newchunk) {
 267                         ocfs2_release_local_quota_bitmaps(head);
 268                         return -ENOMEM;
 269                 }
 270                 newchunk->qc_num = i;
 271                 newchunk->qc_headerbh = NULL;
 272                 status = ocfs2_read_quota_block(inode,
 273                                 ol_quota_chunk_block(inode->i_sb, i),
 274                                 &newchunk->qc_headerbh);
 275                 if (status) {
 276                         mlog_errno(status);
 277                         kmem_cache_free(ocfs2_qf_chunk_cachep, newchunk);
 278                         ocfs2_release_local_quota_bitmaps(head);
 279                         return status;
 280                 }
 281                 list_add_tail(&newchunk->qc_chunk, head);
 282         }
 283         return 0;
 284 }
 285
 286 static void olq_update_info(struct buffer_head *bh, void *private)
 287 {
 288         struct mem_dqinfo *info = private;
 289         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 290         struct ocfs2_local_disk_dqinfo *ldinfo;
 291
 292         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 293                                                 OCFS2_LOCAL_INFO_OFF);
 294         spin_lock(&dq_data_lock);
 295         ldinfo->dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
 296         ldinfo->dqi_chunks = cpu_to_le32(oinfo->dqi_chunks);
 297         ldinfo->dqi_blocks = cpu_to_le32(oinfo->dqi_blocks);
 298         spin_unlock(&dq_data_lock);
 299 }
 300
 301 static int ocfs2_add_recovery_chunk(struct super_block *sb,
 302                                     struct ocfs2_local_disk_chunk *dchunk,
 303                                     int chunk,
 304                                     struct list_head *head)
 305 {
 306         struct ocfs2_recovery_chunk *rc;
 307
 308         rc = kmalloc(sizeof(struct ocfs2_recovery_chunk), GFP_NOFS);
 309         if (!rc)
 310                 return -ENOMEM;
 311         rc->rc_chunk = chunk;
 312         rc->rc_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
 313         if (!rc->rc_bitmap) {
 314                 kfree(rc);
 315                 return -ENOMEM;
 316         }
 317         memcpy(rc->rc_bitmap, dchunk->dqc_bitmap,
 318                (ol_chunk_entries(sb) + 7) >> 3);
 319         list_add_tail(&rc->rc_list, head);
 320         return 0;
 321 }
 322
 323 static void free_recovery_list(struct list_head *head)
 324 {
 325         struct ocfs2_recovery_chunk *next;
 326         struct ocfs2_recovery_chunk *rchunk;
 327
 328         list_for_each_entry_safe(rchunk, next, head, rc_list) {
 329                 list_del(&rchunk->rc_list);
 330                 kfree(rchunk->rc_bitmap);
 331                 kfree(rchunk);
 332         }
 333 }
 334
 335 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec)
 336 {
 337         int type;
 338
 339         for (type = 0; type < MAXQUOTAS; type++)
 340                 free_recovery_list(&(rec->r_list[type]));
 341         kfree(rec);
 342 }
 343
 344 /* Load entries in our quota file we have to recover*/
 345 static int ocfs2_recovery_load_quota(struct inode *lqinode,
 346                                      struct ocfs2_local_disk_dqinfo *ldinfo,
 347                                      int type,
 348                                      struct list_head *head)
 349 {
 350         struct super_block *sb = lqinode->i_sb;
 351         struct buffer_head *hbh;
 352         struct ocfs2_local_disk_chunk *dchunk;
 353         int i, chunks = le32_to_cpu(ldinfo->dqi_chunks);
 354         int status = 0;
 355
 356         for (i = 0; i < chunks; i++) {
 357                 hbh = NULL;
 358                 status = ocfs2_read_quota_block(lqinode,
 359                                                 ol_quota_chunk_block(sb, i),
 360                                                 &hbh);
 361                 if (status) {
 362                         mlog_errno(status);
 363                         break;
 364                 }
 365                 dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
 366                 if (le32_to_cpu(dchunk->dqc_free) < ol_chunk_entries(sb))
 367                         status = ocfs2_add_recovery_chunk(sb, dchunk, i, head);
 368                 brelse(hbh);
 369                 if (status < 0)
 370                         break;
 371         }
 372         if (status < 0)
 373                 free_recovery_list(head);
 374         return status;
 375 }
 376
 377 static struct ocfs2_quota_recovery *ocfs2_alloc_quota_recovery(void)
 378 {
 379         int type;
 380         struct ocfs2_quota_recovery *rec;
 381
 382         rec = kmalloc(sizeof(struct ocfs2_quota_recovery), GFP_NOFS);
 383         if (!rec)
 384                 return NULL;
 385         for (type = 0; type < MAXQUOTAS; type++)
 386                 INIT_LIST_HEAD(&(rec->r_list[type]));
 387         return rec;
 388 }
 389
 390 /* Load information we need for quota recovery into memory */
 391 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
 392                                                 struct ocfs2_super *osb,
 393                                                 int slot_num)
 394 {
 395         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 396                                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 397         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 398                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 399         struct super_block *sb = osb->sb;
 400         struct ocfs2_local_disk_dqinfo *ldinfo;
 401         struct inode *lqinode;
 402         struct buffer_head *bh;
 403         int type;
 404         int status = 0;
 405         struct ocfs2_quota_recovery *rec;
 406
 407         printk(KERN_NOTICE "ocfs2: Beginning quota recovery on device (%s) for "
 408                "slot %u\n", osb->dev_str, slot_num);
 409
 410         rec = ocfs2_alloc_quota_recovery();
 411         if (!rec)
 412                 return ERR_PTR(-ENOMEM);
 413         /* First init... */
 414
 415         for (type = 0; type < MAXQUOTAS; type++) {
 416                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 417                         continue;
 418                 /* At this point, journal of the slot is already replayed so
 419                  * we can trust metadata and data of the quota file */
 420                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
 421                 if (!lqinode) {
 422                         status = -ENOENT;
 423                         goto out;
 424                 }
 425                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
 426                                                OCFS2_META_LOCK_RECOVERY);
 427                 if (status < 0) {
 428                         mlog_errno(status);
 429                         goto out_put;
 430                 }
 431                 /* Now read local header */
 432                 bh = NULL;
 433                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
 434                 if (status) {
 435                         mlog_errno(status);
 436                         mlog(ML_ERROR, "failed to read quota file info header "
 437                                 "(slot=%d type=%d)\n", slot_num, type);
 438                         goto out_lock;
 439                 }
 440                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 441                                                         OCFS2_LOCAL_INFO_OFF);
 442                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 443                                                    &rec->r_list[type]);
 444                 brelse(bh);
 445 out_lock:
 446                 ocfs2_inode_unlock(lqinode, 1);
 447 out_put:
 448                 iput(lqinode);
 449                 if (status < 0)
 450                         break;
 451         }
 452 out:
 453         if (status < 0) {
 454                 ocfs2_free_quota_recovery(rec);
 455                 rec = ERR_PTR(status);
 456         }
 457         return rec;
 458 }
 459
 460 /* Sync changes in local quota file into global quota file and
 461  * reinitialize local quota file.
 462  * The function expects local quota file to be already locked and
 463  * dqonoff_mutex locked. */
 464 static int ocfs2_recover_local_quota_file(struct inode *lqinode,
 465                                           int type,
 466                                           struct ocfs2_quota_recovery *rec)
 467 {
 468         struct super_block *sb = lqinode->i_sb;
 469         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 470         struct ocfs2_local_disk_chunk *dchunk;
 471         struct ocfs2_local_disk_dqblk *dqblk;
 472         struct dquot *dquot;
 473         handle_t *handle;
 474         struct buffer_head *hbh = NULL, *qbh = NULL;
 475         int status = 0;
 476         int bit, chunk;
 477         struct ocfs2_recovery_chunk *rchunk, *next;
 478         qsize_t spacechange, inodechange;
 479
 480         trace_ocfs2_recover_local_quota_file((unsigned long)lqinode->i_ino, type);
 481
 482         list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
 483                 chunk = rchunk->rc_chunk;
 484                 hbh = NULL;
 485                 status = ocfs2_read_quota_block(lqinode,
 486                                                 ol_quota_chunk_block(sb, chunk),
 487                                                 &hbh);
 488                 if (status) {
 489                         mlog_errno(status);
 490                         break;
 491                 }
 492                 dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
 493                 for_each_set_bit(bit, rchunk->rc_bitmap, ol_chunk_entries(sb)) {
 494                         qbh = NULL;
 495                         status = ocfs2_read_quota_block(lqinode,
 496                                                 ol_dqblk_block(sb, chunk, bit),
 497                                                 &qbh);
 498                         if (status) {
 499                                 mlog_errno(status);
 500                                 break;
 501                         }
 502                         dqblk = (struct ocfs2_local_disk_dqblk *)(qbh->b_data +
 503                                 ol_dqblk_block_off(sb, chunk, bit));
 504                         dquot = dqget(sb,
 505                                       make_kqid(&init_user_ns, type,
 506                                                 le64_to_cpu(dqblk->dqb_id)));
 507                         if (!dquot) {
 508                                 status = -EIO;
 509                                 mlog(ML_ERROR, "Failed to get quota structure "
 510                                      "for id %u, type %d. Cannot finish quota "
 511                                      "file recovery.\n",
 512                                      (unsigned)le64_to_cpu(dqblk->dqb_id),
 513                                      type);
 514                                 goto out_put_bh;
 515                         }
 516                         status = ocfs2_lock_global_qf(oinfo, 1);
 517                         if (status < 0) {
 518                                 mlog_errno(status);
 519                                 goto out_put_dquot;
 520                         }
 521
 522                         handle = ocfs2_start_trans(OCFS2_SB(sb),
 523                                                    OCFS2_QSYNC_CREDITS);
 524                         if (IS_ERR(handle)) {
 525                                 status = PTR_ERR(handle);
 526                                 mlog_errno(status);
 527                                 goto out_drop_lock;
 528                         }
 529                         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 530                         spin_lock(&dq_data_lock);
 531                         /* Add usage from quota entry into quota changes
 532                          * of our node. Auxiliary variables are important
 533                          * due to signedness */
 534                         spacechange = le64_to_cpu(dqblk->dqb_spacemod);
 535                         inodechange = le64_to_cpu(dqblk->dqb_inodemod);
 536                         dquot->dq_dqb.dqb_curspace += spacechange;
 537                         dquot->dq_dqb.dqb_curinodes += inodechange;
 538                         spin_unlock(&dq_data_lock);
 539                         /* We want to drop reference held by the crashed
 540                          * node. Since we have our own reference we know
 541                          * global structure actually won't be freed. */
 542                         status = ocfs2_global_release_dquot(dquot);
 543                         if (status < 0) {
 544                                 mlog_errno(status);
 545                                 goto out_commit;
 546                         }
 547                         /* Release local quota file entry */
 548                         status = ocfs2_journal_access_dq(handle,
 549                                         INODE_CACHE(lqinode),
 550                                         qbh, OCFS2_JOURNAL_ACCESS_WRITE);
 551                         if (status < 0) {
 552                                 mlog_errno(status);
 553                                 goto out_commit;
 554                         }
 555                         lock_buffer(qbh);
 556                         WARN_ON(!ocfs2_test_bit_unaligned(bit, dchunk->dqc_bitmap));
 557                         ocfs2_clear_bit_unaligned(bit, dchunk->dqc_bitmap);
 558                         le32_add_cpu(&dchunk->dqc_free, 1);
 559                         unlock_buffer(qbh);
 560                         ocfs2_journal_dirty(handle, qbh);
 561 out_commit:
 562                         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 563                         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 564 out_drop_lock:
 565                         ocfs2_unlock_global_qf(oinfo, 1);
 566 out_put_dquot:
 567                         dqput(dquot);
 568 out_put_bh:
 569                         brelse(qbh);
 570                         if (status < 0)
 571                                 break;
 572                 }
 573                 brelse(hbh);
 574                 list_del(&rchunk->rc_list);
 575                 kfree(rchunk->rc_bitmap);
 576                 kfree(rchunk);
 577                 if (status < 0)
 578                         break;
 579         }
 580         if (status < 0)
 581                 free_recovery_list(&(rec->r_list[type]));
 582         if (status)
 583                 mlog_errno(status);
 584         return status;
 585 }
 586
 587 /* Recover local quota files for given node different from us */
 588 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
 589                                 struct ocfs2_quota_recovery *rec,
 590                                 int slot_num)
 591 {
 592         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 593                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 594         struct super_block *sb = osb->sb;
 595         struct ocfs2_local_disk_dqinfo *ldinfo;
 596         struct buffer_head *bh;
 597         handle_t *handle;
 598         int type;
 599         int status = 0;
 600         struct inode *lqinode;
 601         unsigned int flags;
 602
 603         printk(KERN_NOTICE "ocfs2: Finishing quota recovery on device (%s) for "
 604                "slot %u\n", osb->dev_str, slot_num);
 605
 606         mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
 607         for (type = 0; type < MAXQUOTAS; type++) {
 608                 if (list_empty(&(rec->r_list[type])))
 609                         continue;
 610                 trace_ocfs2_finish_quota_recovery(slot_num);
 611                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
 612                 if (!lqinode) {
 613                         status = -ENOENT;
 614                         goto out;
 615                 }
 616                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
 617                                                        OCFS2_META_LOCK_NOQUEUE);
 618                 /* Someone else is holding the lock? Then he must be
 619                  * doing the recovery. Just skip the file... */
 620                 if (status == -EAGAIN) {
 621                         printk(KERN_NOTICE "ocfs2: Skipping quota recovery on "
 622                                "device (%s) for slot %d because quota file is "
 623                                "locked.\n", osb->dev_str, slot_num);
 624                         status = 0;
 625                         goto out_put;
 626                 } else if (status < 0) {
 627                         mlog_errno(status);
 628                         goto out_put;
 629                 }
 630                 /* Now read local header */
 631                 bh = NULL;
 632                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
 633                 if (status) {
 634                         mlog_errno(status);
 635                         mlog(ML_ERROR, "failed to read quota file info header "
 636                                 "(slot=%d type=%d)\n", slot_num, type);
 637                         goto out_lock;
 638                 }
 639                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 640                                                         OCFS2_LOCAL_INFO_OFF);
 641                 /* Is recovery still needed? */
 642                 flags = le32_to_cpu(ldinfo->dqi_flags);
 643                 if (!(flags & OLQF_CLEAN))
 644                         status = ocfs2_recover_local_quota_file(lqinode,
 645                                                                 type,
 646                                                                 rec);
 647                 /* We don't want to mark file as clean when it is actually
 648                  * active */
 649                 if (slot_num == osb->slot_num)
 650                         goto out_bh;
 651                 /* Mark quota file as clean if we are recovering quota file of
 652                  * some other node. */
 653                 handle = ocfs2_start_trans(osb,
 654                                            OCFS2_LOCAL_QINFO_WRITE_CREDITS);
 655                 if (IS_ERR(handle)) {
 656                         status = PTR_ERR(handle);
 657                         mlog_errno(status);
 658                         goto out_bh;
 659                 }
 660                 status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
 661                                                  bh,
 662                                                  OCFS2_JOURNAL_ACCESS_WRITE);
 663                 if (status < 0) {
 664                         mlog_errno(status);
 665                         goto out_trans;
 666                 }
 667                 lock_buffer(bh);
 668                 ldinfo->dqi_flags = cpu_to_le32(flags | OLQF_CLEAN);
 669                 unlock_buffer(bh);
 670                 ocfs2_journal_dirty(handle, bh);
 671 out_trans:
 672                 ocfs2_commit_trans(osb, handle);
 673 out_bh:
 674                 brelse(bh);
 675 out_lock:
 676                 ocfs2_inode_unlock(lqinode, 1);
 677 out_put:
 678                 iput(lqinode);
 679                 if (status < 0)
 680                         break;
 681         }
 682 out:
 683         mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 684         kfree(rec);
 685         return status;
 686 }
 687
 688 /* Read information header from quota file */
 689 static int ocfs2_local_read_info(struct super_block *sb, int type)
 690 {
 691         struct ocfs2_local_disk_dqinfo *ldinfo;
 692         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 693         struct ocfs2_mem_dqinfo *oinfo;
 694         struct inode *lqinode = sb_dqopt(sb)->files[type];
 695         int status;
 696         struct buffer_head *bh = NULL;
 697         struct ocfs2_quota_recovery *rec;
 698         int locked = 0;
 699
 700         /* We don't need the lock and we have to acquire quota file locks
 701          * which will later depend on this lock */
 702         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 703         info->dqi_maxblimit = 0x7fffffffffffffffLL;
 704         info->dqi_maxilimit = 0x7fffffffffffffffLL;
 705         oinfo = kmalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
 706         if (!oinfo) {
 707                 mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
 708                                " info.");
 709                 goto out_err;
 710         }
 711         info->dqi_priv = oinfo;
 712         oinfo->dqi_type = type;
 713         INIT_LIST_HEAD(&oinfo->dqi_chunk);
 714         oinfo->dqi_rec = NULL;
 715         oinfo->dqi_lqi_bh = NULL;
 716         oinfo->dqi_libh = NULL;
 717
 718         status = ocfs2_global_read_info(sb, type);
 719         if (status < 0)
 720                 goto out_err;
 721
 722         status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
 723         if (status < 0) {
 724                 mlog_errno(status);
 725                 goto out_err;
 726         }
 727         locked = 1;
 728
 729         /* Now read local header */
 730         status = ocfs2_read_quota_block(lqinode, 0, &bh);
 731         if (status) {
 732                 mlog_errno(status);
 733                 mlog(ML_ERROR, "failed to read quota file info header "
 734                         "(type=%d)\n", type);
 735                 goto out_err;
 736         }
 737         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 738                                                 OCFS2_LOCAL_INFO_OFF);
 739         info->dqi_flags = le32_to_cpu(ldinfo->dqi_flags);
 740         oinfo->dqi_chunks = le32_to_cpu(ldinfo->dqi_chunks);
 741         oinfo->dqi_blocks = le32_to_cpu(ldinfo->dqi_blocks);
 742         oinfo->dqi_libh = bh;
 743
 744         /* We crashed when using local quota file? */
 745         if (!(info->dqi_flags & OLQF_CLEAN)) {
 746                 rec = OCFS2_SB(sb)->quota_rec;
 747                 if (!rec) {
 748                         rec = ocfs2_alloc_quota_recovery();
 749                         if (!rec) {
 750                                 status = -ENOMEM;
 751                                 mlog_errno(status);
 752                                 goto out_err;
 753                         }
 754                         OCFS2_SB(sb)->quota_rec = rec;
 755                 }
 756
 757                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 758                                                    &rec->r_list[type]);
 759                 if (status < 0) {
 760                         mlog_errno(status);
 761                         goto out_err;
 762                 }
 763         }
 764
 765         status = ocfs2_load_local_quota_bitmaps(lqinode,
 766                                                 ldinfo,
 767                                                 &oinfo->dqi_chunk);
 768         if (status < 0) {
 769                 mlog_errno(status);
 770                 goto out_err;
 771         }
 772
 773         /* Now mark quota file as used */
 774         info->dqi_flags &= ~OLQF_CLEAN;
 775         status = ocfs2_modify_bh(lqinode, bh, olq_update_info, info);
 776         if (status < 0) {
 777                 mlog_errno(status);
 778                 goto out_err;
 779         }
 780
 781         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 782         return 0;
 783 out_err:
 784         if (oinfo) {
 785                 iput(oinfo->dqi_gqinode);
 786                 ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 787                 ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 788                 brelse(oinfo->dqi_lqi_bh);
 789                 if (locked)
 790                         ocfs2_inode_unlock(lqinode, 1);
 791                 ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 792                 kfree(oinfo);
 793         }
 794         brelse(bh);
 795         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 796         return -1;
 797 }
 798
 799 /* Write local info to quota file */
 800 static int ocfs2_local_write_info(struct super_block *sb, int type)
 801 {
 802         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 803         struct buffer_head *bh = ((struct ocfs2_mem_dqinfo *)info->dqi_priv)
 804                                                 ->dqi_libh;
 805         int status;
 806
 807         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type], bh, olq_update_info,
 808                                  info);
 809         if (status < 0) {
 810                 mlog_errno(status);
 811                 return -1;
 812         }
 813
 814         return 0;
 815 }
 816
 817 /* Release info from memory */
 818 static int ocfs2_local_free_info(struct super_block *sb, int type)
 819 {
 820         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 821         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 822         struct ocfs2_quota_chunk *chunk;
 823         struct ocfs2_local_disk_chunk *dchunk;
 824         int mark_clean = 1, len;
 825         int status;
 826
 827         iput(oinfo->dqi_gqinode);
 828         ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 829         ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 830         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 831                 dchunk = (struct ocfs2_local_disk_chunk *)
 832                                         (chunk->qc_headerbh->b_data);
 833                 if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 834                         len = ol_chunk_entries(sb);
 835                 } else {
 836                         len = (oinfo->dqi_blocks -
 837                                ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 838                               * ol_quota_entries_per_block(sb);
 839                 }
 840                 /* Not all entries free? Bug! */
 841                 if (le32_to_cpu(dchunk->dqc_free) != len) {
 842                         mlog(ML_ERROR, "releasing quota file with used "
 843                                         "entries (type=%d)\n", type);
 844                         mark_clean = 0;
 845                 }
 846         }
 847         ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 848
 849         /* dqonoff_mutex protects us against racing with recovery thread... */
 850         if (oinfo->dqi_rec) {
 851                 ocfs2_free_quota_recovery(oinfo->dqi_rec);
 852                 mark_clean = 0;
 853         }
 854
 855         if (!mark_clean)
 856                 goto out;
 857
 858         /* Mark local file as clean */
 859         info->dqi_flags |= OLQF_CLEAN;
 860         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type],
 861                                  oinfo->dqi_libh,
 862                                  olq_update_info,
 863                                  info);
 864         if (status < 0) {
 865                 mlog_errno(status);
 866                 goto out;
 867         }
 868
 869 out:
 870         ocfs2_inode_unlock(sb_dqopt(sb)->files[type], 1);
 871         brelse(oinfo->dqi_libh);
 872         brelse(oinfo->dqi_lqi_bh);
 873         kfree(oinfo);
 874         return 0;
 875 }
 876
 877 static void olq_set_dquot(struct buffer_head *bh, void *private)
 878 {
 879         struct ocfs2_dquot *od = private;
 880         struct ocfs2_local_disk_dqblk *dqblk;
 881         struct super_block *sb = od->dq_dquot.dq_sb;
 882
 883         dqblk = (struct ocfs2_local_disk_dqblk *)(bh->b_data
 884                 + ol_dqblk_block_offset(sb, od->dq_local_off));
 885
 886         dqblk->dqb_id = cpu_to_le64(from_kqid(&init_user_ns,
 887                                               od->dq_dquot.dq_id));
 888         spin_lock(&dq_data_lock);
 889         dqblk->dqb_spacemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curspace -
 890                                           od->dq_origspace);
 891         dqblk->dqb_inodemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curinodes -
 892                                           od->dq_originodes);
 893         spin_unlock(&dq_data_lock);
 894         trace_olq_set_dquot(
 895                 (unsigned long long)le64_to_cpu(dqblk->dqb_spacemod),
 896                 (unsigned long long)le64_to_cpu(dqblk->dqb_inodemod),
 897                 from_kqid(&init_user_ns, od->dq_dquot.dq_id));
 898 }
 899
 900 /* Write dquot to local quota file */
 901 int ocfs2_local_write_dquot(struct dquot *dquot)
 902 {
 903         struct super_block *sb = dquot->dq_sb;
 904         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
 905         struct buffer_head *bh;
 906         struct inode *lqinode = sb_dqopt(sb)->files[dquot->dq_id.type];
 907         int status;
 908
 909         status = ocfs2_read_quota_phys_block(lqinode, od->dq_local_phys_blk,
 910                                              &bh);
 911         if (status) {
 912                 mlog_errno(status);
 913                 goto out;
 914         }
 915         status = ocfs2_modify_bh(lqinode, bh, olq_set_dquot, od);
 916         if (status < 0) {
 917                 mlog_errno(status);
 918                 goto out;
 919         }
 920 out:
 921         brelse(bh);
 922         return status;
 923 }
 924
 925 /* Find free entry in local quota file */
 926 static struct ocfs2_quota_chunk *ocfs2_find_free_entry(struct super_block *sb,
 927                                                        int type,
 928                                                        int *offset)
 929 {
 930         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 931         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 932         struct ocfs2_quota_chunk *chunk;
 933         struct ocfs2_local_disk_chunk *dchunk;
 934         int found = 0, len;
 935
 936         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 937                 dchunk = (struct ocfs2_local_disk_chunk *)
 938                                                 chunk->qc_headerbh->b_data;
 939                 if (le32_to_cpu(dchunk->dqc_free) > 0) {
 940                         found = 1;
 941                         break;
 942                 }
 943         }
 944         if (!found)
 945                 return NULL;
 946
 947         if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 948                 len = ol_chunk_entries(sb);
 949         } else {
 950                 len = (oinfo->dqi_blocks -
 951                        ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 952                       * ol_quota_entries_per_block(sb);
 953         }
 954
 955         found = ocfs2_find_next_zero_bit_unaligned(dchunk->dqc_bitmap, len, 0);
 956         /* We failed? */
 957         if (found == len) {
 958                 mlog(ML_ERROR, "Did not find empty entry in chunk %d with %u"
 959                      " entries free (type=%d)\n", chunk->qc_num,
 960                      le32_to_cpu(dchunk->dqc_free), type);
 961                 return ERR_PTR(-EIO);
 962         }
 963         *offset = found;
 964         return chunk;
 965 }
 966
 967 /* Add new chunk to the local quota file */
 968 static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
 969                                                         struct super_block *sb,
 970                                                         int type,
 971                                                         int *offset)
 972 {
 973         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 974         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 975         struct inode *lqinode = sb_dqopt(sb)->files[type];
 976         struct ocfs2_quota_chunk *chunk = NULL;
 977         struct ocfs2_local_disk_chunk *dchunk;
 978         int status;
 979         handle_t *handle;
 980         struct buffer_head *bh = NULL, *dbh = NULL;
 981         u64 p_blkno;
 982
 983         /* We are protected by dqio_sem so no locking needed */
 984         status = ocfs2_extend_no_holes(lqinode, NULL,
 985                                        lqinode->i_size + 2 * sb->s_blocksize,
 986                                        lqinode->i_size);
 987         if (status < 0) {
 988                 mlog_errno(status);
 989                 goto out;
 990         }
 991         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
 992                                           lqinode->i_size + 2 * sb->s_blocksize);
 993         if (status < 0) {
 994                 mlog_errno(status);
 995                 goto out;
 996         }
 997
 998         chunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
 999         if (!chunk) {
1000                 status = -ENOMEM;
1001                 mlog_errno(status);
1002                 goto out;
1003         }
1004         /* Local quota info and two new blocks we initialize */
1005         handle = ocfs2_start_trans(OCFS2_SB(sb),
1006                         OCFS2_LOCAL_QINFO_WRITE_CREDITS +
1007                         2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
1008         if (IS_ERR(handle)) {
1009                 status = PTR_ERR(handle);
1010                 mlog_errno(status);
1011                 goto out;
1012         }
1013
1014         /* Initialize chunk header */
1015         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
1016                                              &p_blkno, NULL, NULL);
1017         if (status < 0) {
1018                 mlog_errno(status);
1019                 goto out_trans;
1020         }
1021         bh = sb_getblk(sb, p_blkno);
1022         if (!bh) {
1023                 status = -ENOMEM;
1024                 mlog_errno(status);
1025                 goto out_trans;
1026         }
1027         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
1028         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
1029         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
1030                                          OCFS2_JOURNAL_ACCESS_CREATE);
1031         if (status < 0) {
1032                 mlog_errno(status);
1033                 goto out_trans;
1034         }
1035         lock_buffer(bh);
1036         dchunk->dqc_free = cpu_to_le32(ol_quota_entries_per_block(sb));
1037         memset(dchunk->dqc_bitmap, 0,
1038                sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
1039                OCFS2_QBLK_RESERVED_SPACE);
1040         unlock_buffer(bh);
1041         ocfs2_journal_dirty(handle, bh);
1042
1043         /* Initialize new block with structures */
1044         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks + 1,
1045                                              &p_blkno, NULL, NULL);
1046         if (status < 0) {
1047                 mlog_errno(status);
1048                 goto out_trans;
1049         }
1050         dbh = sb_getblk(sb, p_blkno);
1051         if (!dbh) {
1052                 status = -ENOMEM;
1053                 mlog_errno(status);
1054                 goto out_trans;
1055         }
1056         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), dbh);
1057         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), dbh,
1058                                          OCFS2_JOURNAL_ACCESS_CREATE);
1059         if (status < 0) {
1060                 mlog_errno(status);
1061                 goto out_trans;
1062         }
1063         lock_buffer(dbh);
1064         memset(dbh->b_data, 0, sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE);
1065         unlock_buffer(dbh);
1066         ocfs2_journal_dirty(handle, dbh);
1067
1068         /* Update local quotafile info */
1069         oinfo->dqi_blocks += 2;
1070         oinfo->dqi_chunks++;
1071         status = ocfs2_local_write_info(sb, type);
1072         if (status < 0) {
1073                 mlog_errno(status);
1074                 goto out_trans;
1075         }
1076         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1077         if (status < 0) {
1078                 mlog_errno(status);
1079                 goto out;
1080         }
1081
1082         list_add_tail(&chunk->qc_chunk, &oinfo->dqi_chunk);
1083         chunk->qc_num = list_entry(chunk->qc_chunk.prev,
1084                                    struct ocfs2_quota_chunk,
1085                                    qc_chunk)->qc_num + 1;
1086         chunk->qc_headerbh = bh;
1087         *offset = 0;
1088         return chunk;
1089 out_trans:
1090         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1091 out:
1092         brelse(bh);
1093         brelse(dbh);
1094         kmem_cache_free(ocfs2_qf_chunk_cachep, chunk);
1095         return ERR_PTR(status);
1096 }
1097
1098 /* Find free entry in local quota file */
1099 static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
1100                                                        struct super_block *sb,
1101                                                        int type,
1102                                                        int *offset)
1103 {
1104         struct mem_dqinfo *info = sb_dqinfo(sb, type);
1105         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
1106         struct ocfs2_quota_chunk *chunk;
1107         struct inode *lqinode = sb_dqopt(sb)->files[type];
1108         struct ocfs2_local_disk_chunk *dchunk;
1109         int epb = ol_quota_entries_per_block(sb);
1110         unsigned int chunk_blocks;
1111         struct buffer_head *bh;
1112         u64 p_blkno;
1113         int status;
1114         handle_t *handle;
1115
1116         if (list_empty(&oinfo->dqi_chunk))
1117                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1118         /* Is the last chunk full? */
1119         chunk = list_entry(oinfo->dqi_chunk.prev,
1120                         struct ocfs2_quota_chunk, qc_chunk);
1121         chunk_blocks = oinfo->dqi_blocks -
1122                         ol_quota_chunk_block(sb, chunk->qc_num) - 1;
1123         if (ol_chunk_blocks(sb) == chunk_blocks)
1124                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1125
1126         /* We are protected by dqio_sem so no locking needed */
1127         status = ocfs2_extend_no_holes(lqinode, NULL,
1128                                        lqinode->i_size + sb->s_blocksize,
1129                                        lqinode->i_size);
1130         if (status < 0) {
1131                 mlog_errno(status);
1132                 goto out;
1133         }
1134         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
1135                                           lqinode->i_size + sb->s_blocksize);
1136         if (status < 0) {
1137                 mlog_errno(status);
1138                 goto out;
1139         }
1140
1141         /* Get buffer from the just added block */
1142         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
1143                                              &p_blkno, NULL, NULL);
1144         if (status < 0) {
1145                 mlog_errno(status);
1146                 goto out;
1147         }
1148         bh = sb_getblk(sb, p_blkno);
1149         if (!bh) {
1150                 status = -ENOMEM;
1151                 mlog_errno(status);
1152                 goto out;
1153         }
1154         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
1155
1156         /* Local quota info, chunk header and the new block we initialize */
1157         handle = ocfs2_start_trans(OCFS2_SB(sb),
1158                         OCFS2_LOCAL_QINFO_WRITE_CREDITS +
1159                         2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
1160         if (IS_ERR(handle)) {
1161                 status = PTR_ERR(handle);
1162                 mlog_errno(status);
1163                 goto out;
1164         }
1165         /* Zero created block */
1166         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
1167                                  OCFS2_JOURNAL_ACCESS_CREATE);
1168         if (status < 0) {
1169                 mlog_errno(status);
1170                 goto out_trans;
1171         }
1172         lock_buffer(bh);
1173         memset(bh->b_data, 0, sb->s_blocksize);
1174         unlock_buffer(bh);
1175         ocfs2_journal_dirty(handle, bh);
1176
1177         /* Update chunk header */
1178         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
1179                                          chunk->qc_headerbh,
1180                                  OCFS2_JOURNAL_ACCESS_WRITE);
1181         if (status < 0) {
1182                 mlog_errno(status);
1183                 goto out_trans;
1184         }
1185
1186         dchunk = (struct ocfs2_local_disk_chunk *)chunk->qc_headerbh->b_data;
1187         lock_buffer(chunk->qc_headerbh);
1188         le32_add_cpu(&dchunk->dqc_free, ol_quota_entries_per_block(sb));
1189         unlock_buffer(chunk->qc_headerbh);
1190         ocfs2_journal_dirty(handle, chunk->qc_headerbh);
1191
1192         /* Update file header */
1193         oinfo->dqi_blocks++;
1194         status = ocfs2_local_write_info(sb, type);
1195         if (status < 0) {
1196                 mlog_errno(status);
1197                 goto out_trans;
1198         }
1199
1200         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1201         if (status < 0) {
1202                 mlog_errno(status);
1203                 goto out;
1204         }
1205         *offset = chunk_blocks * epb;
1206         return chunk;
1207 out_trans:
1208         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1209 out:
1210         return ERR_PTR(status);
1211 }
1212
1213 static void olq_alloc_dquot(struct buffer_head *bh, void *private)
1214 {
1215         int *offset = private;
1216         struct ocfs2_local_disk_chunk *dchunk;
1217
1218         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
1219         ocfs2_set_bit_unaligned(*offset, dchunk->dqc_bitmap);
1220         le32_add_cpu(&dchunk->dqc_free, -1);
1221 }
1222
1223 /* Create dquot in the local file for given id */
1224 int ocfs2_create_local_dquot(struct dquot *dquot)
1225 {
1226         struct super_block *sb = dquot->dq_sb;
1227         int type = dquot->dq_id.type;
1228         struct inode *lqinode = sb_dqopt(sb)->files[type];
1229         struct ocfs2_quota_chunk *chunk;
1230         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1231         int offset;
1232         int status;
1233         u64 pcount;
1234
1235         down_write(&OCFS2_I(lqinode)->ip_alloc_sem);
1236         chunk = ocfs2_find_free_entry(sb, type, &offset);
1237         if (!chunk) {
1238                 chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
1239                 if (IS_ERR(chunk)) {
1240                         status = PTR_ERR(chunk);
1241                         goto out;
1242                 }
1243         } else if (IS_ERR(chunk)) {
1244                 status = PTR_ERR(chunk);
1245                 goto out;
1246         }
1247         od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
1248         od->dq_chunk = chunk;
1249         status = ocfs2_extent_map_get_blocks(lqinode,
1250                                      ol_dqblk_block(sb, chunk->qc_num, offset),
1251                                      &od->dq_local_phys_blk,
1252                                      &pcount,
1253                                      NULL);
1254
1255         /* Initialize dquot structure on disk */
1256         status = ocfs2_local_write_dquot(dquot);
1257         if (status < 0) {
1258                 mlog_errno(status);
1259                 goto out;
1260         }
1261
1262         /* Mark structure as allocated */
1263         status = ocfs2_modify_bh(lqinode, chunk->qc_headerbh, olq_alloc_dquot,
1264                                  &offset);
1265         if (status < 0) {
1266                 mlog_errno(status);
1267                 goto out;
1268         }
1269 out:
1270         up_write(&OCFS2_I(lqinode)->ip_alloc_sem);
1271         return status;
1272 }
1273
1274 /*
1275  * Release dquot structure from local quota file. ocfs2_release_dquot() has
1276  * already started a transaction and written all changes to global quota file
1277  */
1278 int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot)
1279 {
1280         int status;
1281         int type = dquot->dq_id.type;
1282         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1283         struct super_block *sb = dquot->dq_sb;
1284         struct ocfs2_local_disk_chunk *dchunk;
1285         int offset;
1286
1287         status = ocfs2_journal_access_dq(handle,
1288                         INODE_CACHE(sb_dqopt(sb)->files[type]),
1289                         od->dq_chunk->qc_headerbh, OCFS2_JOURNAL_ACCESS_WRITE);
1290         if (status < 0) {
1291                 mlog_errno(status);
1292                 goto out;
1293         }
1294         offset = ol_dqblk_chunk_off(sb, od->dq_chunk->qc_num,
1295                                              od->dq_local_off);
1296         dchunk = (struct ocfs2_local_disk_chunk *)
1297                         (od->dq_chunk->qc_headerbh->b_data);
1298         /* Mark structure as freed */
1299         lock_buffer(od->dq_chunk->qc_headerbh);
1300         ocfs2_clear_bit_unaligned(offset, dchunk->dqc_bitmap);
1301         le32_add_cpu(&dchunk->dqc_free, 1);
1302         unlock_buffer(od->dq_chunk->qc_headerbh);
1303         ocfs2_journal_dirty(handle, od->dq_chunk->qc_headerbh);
1304
1305 out:
1306         /* Clear the read bit so that next time someone uses this
1307          * dquot he reads fresh info from disk and allocates local
1308          * dquot structure */
1309         clear_bit(DQ_READ_B, &dquot->dq_flags);
1310         return status;
1311 }
1312
1313 static const struct quota_format_ops ocfs2_format_ops = {
1314         .check_quota_file       = ocfs2_local_check_quota_file,
1315         .read_file_info         = ocfs2_local_read_info,
1316         .write_file_info        = ocfs2_global_write_info,
1317         .free_file_info         = ocfs2_local_free_info,
1318 };
1319
1320 struct quota_format_type ocfs2_quota_format = {
1321         .qf_fmt_id = QFMT_OCFS2,
1322         .qf_ops = &ocfs2_format_ops,
1323         .qf_owner = THIS_MODULE
1324 };