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 #define MLOG_MASK_PREFIX ML_QUOTA
  12 #include <cluster/masklog.h>
  13
  14 #include "ocfs2_fs.h"
  15 #include "ocfs2.h"
  16 #include "inode.h"
  17 #include "alloc.h"
  18 #include "file.h"
  19 #include "buffer_head_io.h"
  20 #include "journal.h"
  21 #include "sysfile.h"
  22 #include "dlmglue.h"
  23 #include "quota.h"
  24 #include "uptodate.h"
  25
  26 /* Number of local quota structures per block */
  27 static inline unsigned int ol_quota_entries_per_block(struct super_block *sb)
  28 {
  29         return ((sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) /
  30                 sizeof(struct ocfs2_local_disk_dqblk));
  31 }
  32
  33 /* Number of blocks with entries in one chunk */
  34 static inline unsigned int ol_chunk_blocks(struct super_block *sb)
  35 {
  36         return ((sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
  37                  OCFS2_QBLK_RESERVED_SPACE) << 3) /
  38                ol_quota_entries_per_block(sb);
  39 }
  40
  41 /* Number of entries in a chunk bitmap */
  42 static unsigned int ol_chunk_entries(struct super_block *sb)
  43 {
  44         return ol_chunk_blocks(sb) * ol_quota_entries_per_block(sb);
  45 }
  46
  47 /* Offset of the chunk in quota file */
  48 static unsigned int ol_quota_chunk_block(struct super_block *sb, int c)
  49 {
  50         /* 1 block for local quota file info, 1 block per chunk for chunk info */
  51         return 1 + (ol_chunk_blocks(sb) + 1) * c;
  52 }
  53
  54 static unsigned int ol_dqblk_block(struct super_block *sb, int c, int off)
  55 {
  56         int epb = ol_quota_entries_per_block(sb);
  57
  58         return ol_quota_chunk_block(sb, c) + 1 + off / epb;
  59 }
  60
  61 static unsigned int ol_dqblk_block_off(struct super_block *sb, int c, int off)
  62 {
  63         int epb = ol_quota_entries_per_block(sb);
  64
  65         return (off % epb) * sizeof(struct ocfs2_local_disk_dqblk);
  66 }
  67
  68 /* Offset of the dquot structure in the quota file */
  69 static loff_t ol_dqblk_off(struct super_block *sb, int c, int off)
  70 {
  71         return (ol_dqblk_block(sb, c, off) << sb->s_blocksize_bits) +
  72                ol_dqblk_block_off(sb, c, off);
  73 }
  74
  75 /* Compute block number from given offset */
  76 static inline unsigned int ol_dqblk_file_block(struct super_block *sb, loff_t off)
  77 {
  78         return off >> sb->s_blocksize_bits;
  79 }
  80
  81 static inline unsigned int ol_dqblk_block_offset(struct super_block *sb, loff_t off)
  82 {
  83         return off & ((1 << sb->s_blocksize_bits) - 1);
  84 }
  85
  86 /* Compute offset in the chunk of a structure with the given offset */
  87 static int ol_dqblk_chunk_off(struct super_block *sb, int c, loff_t off)
  88 {
  89         int epb = ol_quota_entries_per_block(sb);
  90
  91         return ((off >> sb->s_blocksize_bits) -
  92                         ol_quota_chunk_block(sb, c) - 1) * epb
  93                + ((unsigned int)(off & ((1 << sb->s_blocksize_bits) - 1))) /
  94                  sizeof(struct ocfs2_local_disk_dqblk);
  95 }
  96
  97 /* Write bufferhead into the fs */
  98 static int ocfs2_modify_bh(struct inode *inode, struct buffer_head *bh,
  99                 void (*modify)(struct buffer_head *, void *), void *private)
 100 {
 101         struct super_block *sb = inode->i_sb;
 102         handle_t *handle;
 103         int status;
 104
 105         handle = ocfs2_start_trans(OCFS2_SB(sb),
 106                                    OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
 107         if (IS_ERR(handle)) {
 108                 status = PTR_ERR(handle);
 109                 mlog_errno(status);
 110                 return status;
 111         }
 112         status = ocfs2_journal_access_dq(handle, INODE_CACHE(inode), bh,
 113                                          OCFS2_JOURNAL_ACCESS_WRITE);
 114         if (status < 0) {
 115                 mlog_errno(status);
 116                 ocfs2_commit_trans(OCFS2_SB(sb), handle);
 117                 return status;
 118         }
 119         lock_buffer(bh);
 120         modify(bh, private);
 121         unlock_buffer(bh);
 122         ocfs2_journal_dirty(handle, bh);
 123
 124         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
 125         if (status < 0) {
 126                 mlog_errno(status);
 127                 return status;
 128         }
 129         return 0;
 130 }
 131
 132 /* Check whether we understand format of quota files */
 133 static int ocfs2_local_check_quota_file(struct super_block *sb, int type)
 134 {
 135         unsigned int lmagics[MAXQUOTAS] = OCFS2_LOCAL_QMAGICS;
 136         unsigned int lversions[MAXQUOTAS] = OCFS2_LOCAL_QVERSIONS;
 137         unsigned int gmagics[MAXQUOTAS] = OCFS2_GLOBAL_QMAGICS;
 138         unsigned int gversions[MAXQUOTAS] = OCFS2_GLOBAL_QVERSIONS;
 139         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 140                                         GROUP_QUOTA_SYSTEM_INODE };
 141         struct buffer_head *bh = NULL;
 142         struct inode *linode = sb_dqopt(sb)->files[type];
 143         struct inode *ginode = NULL;
 144         struct ocfs2_disk_dqheader *dqhead;
 145         int status, ret = 0;
 146
 147         /* First check whether we understand local quota file */
 148         status = ocfs2_read_quota_block(linode, 0, &bh);
 149         if (status) {
 150                 mlog_errno(status);
 151                 mlog(ML_ERROR, "failed to read quota file header (type=%d)\n",
 152                         type);
 153                 goto out_err;
 154         }
 155         dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
 156         if (le32_to_cpu(dqhead->dqh_magic) != lmagics[type]) {
 157                 mlog(ML_ERROR, "quota file magic does not match (%u != %u),"
 158                         " type=%d\n", le32_to_cpu(dqhead->dqh_magic),
 159                         lmagics[type], type);
 160                 goto out_err;
 161         }
 162         if (le32_to_cpu(dqhead->dqh_version) != lversions[type]) {
 163                 mlog(ML_ERROR, "quota file version does not match (%u != %u),"
 164                         " type=%d\n", le32_to_cpu(dqhead->dqh_version),
 165                         lversions[type], type);
 166                 goto out_err;
 167         }
 168         brelse(bh);
 169         bh = NULL;
 170
 171         /* Next check whether we understand global quota file */
 172         ginode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 173                                                 OCFS2_INVALID_SLOT);
 174         if (!ginode) {
 175                 mlog(ML_ERROR, "cannot get global quota file inode "
 176                                 "(type=%d)\n", type);
 177                 goto out_err;
 178         }
 179         /* Since the header is read only, we don't care about locking */
 180         status = ocfs2_read_quota_block(ginode, 0, &bh);
 181         if (status) {
 182                 mlog_errno(status);
 183                 mlog(ML_ERROR, "failed to read global quota file header "
 184                                 "(type=%d)\n", type);
 185                 goto out_err;
 186         }
 187         dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
 188         if (le32_to_cpu(dqhead->dqh_magic) != gmagics[type]) {
 189                 mlog(ML_ERROR, "global quota file magic does not match "
 190                         "(%u != %u), type=%d\n",
 191                         le32_to_cpu(dqhead->dqh_magic), gmagics[type], type);
 192                 goto out_err;
 193         }
 194         if (le32_to_cpu(dqhead->dqh_version) != gversions[type]) {
 195                 mlog(ML_ERROR, "global quota file version does not match "
 196                         "(%u != %u), type=%d\n",
 197                         le32_to_cpu(dqhead->dqh_version), gversions[type],
 198                         type);
 199                 goto out_err;
 200         }
 201
 202         ret = 1;
 203 out_err:
 204         brelse(bh);
 205         iput(ginode);
 206         return ret;
 207 }
 208
 209 /* Release given list of quota file chunks */
 210 static void ocfs2_release_local_quota_bitmaps(struct list_head *head)
 211 {
 212         struct ocfs2_quota_chunk *pos, *next;
 213
 214         list_for_each_entry_safe(pos, next, head, qc_chunk) {
 215                 list_del(&pos->qc_chunk);
 216                 brelse(pos->qc_headerbh);
 217                 kmem_cache_free(ocfs2_qf_chunk_cachep, pos);
 218         }
 219 }
 220
 221 /* Load quota bitmaps into memory */
 222 static int ocfs2_load_local_quota_bitmaps(struct inode *inode,
 223                         struct ocfs2_local_disk_dqinfo *ldinfo,
 224                         struct list_head *head)
 225 {
 226         struct ocfs2_quota_chunk *newchunk;
 227         int i, status;
 228
 229         INIT_LIST_HEAD(head);
 230         for (i = 0; i < le32_to_cpu(ldinfo->dqi_chunks); i++) {
 231                 newchunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
 232                 if (!newchunk) {
 233                         ocfs2_release_local_quota_bitmaps(head);
 234                         return -ENOMEM;
 235                 }
 236                 newchunk->qc_num = i;
 237                 newchunk->qc_headerbh = NULL;
 238                 status = ocfs2_read_quota_block(inode,
 239                                 ol_quota_chunk_block(inode->i_sb, i),
 240                                 &newchunk->qc_headerbh);
 241                 if (status) {
 242                         mlog_errno(status);
 243                         kmem_cache_free(ocfs2_qf_chunk_cachep, newchunk);
 244                         ocfs2_release_local_quota_bitmaps(head);
 245                         return status;
 246                 }
 247                 list_add_tail(&newchunk->qc_chunk, head);
 248         }
 249         return 0;
 250 }
 251
 252 static void olq_update_info(struct buffer_head *bh, void *private)
 253 {
 254         struct mem_dqinfo *info = private;
 255         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 256         struct ocfs2_local_disk_dqinfo *ldinfo;
 257
 258         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 259                                                 OCFS2_LOCAL_INFO_OFF);
 260         spin_lock(&dq_data_lock);
 261         ldinfo->dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
 262         ldinfo->dqi_chunks = cpu_to_le32(oinfo->dqi_chunks);
 263         ldinfo->dqi_blocks = cpu_to_le32(oinfo->dqi_blocks);
 264         spin_unlock(&dq_data_lock);
 265 }
 266
 267 static int ocfs2_add_recovery_chunk(struct super_block *sb,
 268                                     struct ocfs2_local_disk_chunk *dchunk,
 269                                     int chunk,
 270                                     struct list_head *head)
 271 {
 272         struct ocfs2_recovery_chunk *rc;
 273
 274         rc = kmalloc(sizeof(struct ocfs2_recovery_chunk), GFP_NOFS);
 275         if (!rc)
 276                 return -ENOMEM;
 277         rc->rc_chunk = chunk;
 278         rc->rc_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
 279         if (!rc->rc_bitmap) {
 280                 kfree(rc);
 281                 return -ENOMEM;
 282         }
 283         memcpy(rc->rc_bitmap, dchunk->dqc_bitmap,
 284                (ol_chunk_entries(sb) + 7) >> 3);
 285         list_add_tail(&rc->rc_list, head);
 286         return 0;
 287 }
 288
 289 static void free_recovery_list(struct list_head *head)
 290 {
 291         struct ocfs2_recovery_chunk *next;
 292         struct ocfs2_recovery_chunk *rchunk;
 293
 294         list_for_each_entry_safe(rchunk, next, head, rc_list) {
 295                 list_del(&rchunk->rc_list);
 296                 kfree(rchunk->rc_bitmap);
 297                 kfree(rchunk);
 298         }
 299 }
 300
 301 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec)
 302 {
 303         int type;
 304
 305         for (type = 0; type < MAXQUOTAS; type++)
 306                 free_recovery_list(&(rec->r_list[type]));
 307         kfree(rec);
 308 }
 309
 310 /* Load entries in our quota file we have to recover*/
 311 static int ocfs2_recovery_load_quota(struct inode *lqinode,
 312                                      struct ocfs2_local_disk_dqinfo *ldinfo,
 313                                      int type,
 314                                      struct list_head *head)
 315 {
 316         struct super_block *sb = lqinode->i_sb;
 317         struct buffer_head *hbh;
 318         struct ocfs2_local_disk_chunk *dchunk;
 319         int i, chunks = le32_to_cpu(ldinfo->dqi_chunks);
 320         int status = 0;
 321
 322         for (i = 0; i < chunks; i++) {
 323                 hbh = NULL;
 324                 status = ocfs2_read_quota_block(lqinode,
 325                                                 ol_quota_chunk_block(sb, i),
 326                                                 &hbh);
 327                 if (status) {
 328                         mlog_errno(status);
 329                         break;
 330                 }
 331                 dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
 332                 if (le32_to_cpu(dchunk->dqc_free) < ol_chunk_entries(sb))
 333                         status = ocfs2_add_recovery_chunk(sb, dchunk, i, head);
 334                 brelse(hbh);
 335                 if (status < 0)
 336                         break;
 337         }
 338         if (status < 0)
 339                 free_recovery_list(head);
 340         return status;
 341 }
 342
 343 static struct ocfs2_quota_recovery *ocfs2_alloc_quota_recovery(void)
 344 {
 345         int type;
 346         struct ocfs2_quota_recovery *rec;
 347
 348         rec = kmalloc(sizeof(struct ocfs2_quota_recovery), GFP_NOFS);
 349         if (!rec)
 350                 return NULL;
 351         for (type = 0; type < MAXQUOTAS; type++)
 352                 INIT_LIST_HEAD(&(rec->r_list[type]));
 353         return rec;
 354 }
 355
 356 /* Load information we need for quota recovery into memory */
 357 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
 358                                                 struct ocfs2_super *osb,
 359                                                 int slot_num)
 360 {
 361         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 362                                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 363         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 364                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 365         struct super_block *sb = osb->sb;
 366         struct ocfs2_local_disk_dqinfo *ldinfo;
 367         struct inode *lqinode;
 368         struct buffer_head *bh;
 369         int type;
 370         int status = 0;
 371         struct ocfs2_quota_recovery *rec;
 372
 373         mlog(ML_NOTICE, "Beginning quota recovery in slot %u\n", slot_num);
 374         rec = ocfs2_alloc_quota_recovery();
 375         if (!rec)
 376                 return ERR_PTR(-ENOMEM);
 377         /* First init... */
 378
 379         for (type = 0; type < MAXQUOTAS; type++) {
 380                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 381                         continue;
 382                 /* At this point, journal of the slot is already replayed so
 383                  * we can trust metadata and data of the quota file */
 384                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
 385                 if (!lqinode) {
 386                         status = -ENOENT;
 387                         goto out;
 388                 }
 389                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
 390                                                OCFS2_META_LOCK_RECOVERY);
 391                 if (status < 0) {
 392                         mlog_errno(status);
 393                         goto out_put;
 394                 }
 395                 /* Now read local header */
 396                 bh = NULL;
 397                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
 398                 if (status) {
 399                         mlog_errno(status);
 400                         mlog(ML_ERROR, "failed to read quota file info header "
 401                                 "(slot=%d type=%d)\n", slot_num, type);
 402                         goto out_lock;
 403                 }
 404                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 405                                                         OCFS2_LOCAL_INFO_OFF);
 406                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 407                                                    &rec->r_list[type]);
 408                 brelse(bh);
 409 out_lock:
 410                 ocfs2_inode_unlock(lqinode, 1);
 411 out_put:
 412                 iput(lqinode);
 413                 if (status < 0)
 414                         break;
 415         }
 416 out:
 417         if (status < 0) {
 418                 ocfs2_free_quota_recovery(rec);
 419                 rec = ERR_PTR(status);
 420         }
 421         return rec;
 422 }
 423
 424 /* Sync changes in local quota file into global quota file and
 425  * reinitialize local quota file.
 426  * The function expects local quota file to be already locked and
 427  * dqonoff_mutex locked. */
 428 static int ocfs2_recover_local_quota_file(struct inode *lqinode,
 429                                           int type,
 430                                           struct ocfs2_quota_recovery *rec)
 431 {
 432         struct super_block *sb = lqinode->i_sb;
 433         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 434         struct ocfs2_local_disk_chunk *dchunk;
 435         struct ocfs2_local_disk_dqblk *dqblk;
 436         struct dquot *dquot;
 437         handle_t *handle;
 438         struct buffer_head *hbh = NULL, *qbh = NULL;
 439         int status = 0;
 440         int bit, chunk;
 441         struct ocfs2_recovery_chunk *rchunk, *next;
 442         qsize_t spacechange, inodechange;
 443
 444         mlog_entry("ino=%lu type=%u", (unsigned long)lqinode->i_ino, type);
 445
 446         list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
 447                 chunk = rchunk->rc_chunk;
 448                 hbh = NULL;
 449                 status = ocfs2_read_quota_block(lqinode,
 450                                                 ol_quota_chunk_block(sb, chunk),
 451                                                 &hbh);
 452                 if (status) {
 453                         mlog_errno(status);
 454                         break;
 455                 }
 456                 dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
 457                 for_each_set_bit(bit, rchunk->rc_bitmap, ol_chunk_entries(sb)) {
 458                         qbh = NULL;
 459                         status = ocfs2_read_quota_block(lqinode,
 460                                                 ol_dqblk_block(sb, chunk, bit),
 461                                                 &qbh);
 462                         if (status) {
 463                                 mlog_errno(status);
 464                                 break;
 465                         }
 466                         dqblk = (struct ocfs2_local_disk_dqblk *)(qbh->b_data +
 467                                 ol_dqblk_block_off(sb, chunk, bit));
 468                         dquot = dqget(sb, le64_to_cpu(dqblk->dqb_id), type);
 469                         if (!dquot) {
 470                                 status = -EIO;
 471                                 mlog(ML_ERROR, "Failed to get quota structure "
 472                                      "for id %u, type %d. Cannot finish quota "
 473                                      "file recovery.\n",
 474                                      (unsigned)le64_to_cpu(dqblk->dqb_id),
 475                                      type);
 476                                 goto out_put_bh;
 477                         }
 478                         status = ocfs2_lock_global_qf(oinfo, 1);
 479                         if (status < 0) {
 480                                 mlog_errno(status);
 481                                 goto out_put_dquot;
 482                         }
 483
 484                         handle = ocfs2_start_trans(OCFS2_SB(sb),
 485                                                    OCFS2_QSYNC_CREDITS);
 486                         if (IS_ERR(handle)) {
 487                                 status = PTR_ERR(handle);
 488                                 mlog_errno(status);
 489                                 goto out_drop_lock;
 490                         }
 491                         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 492                         spin_lock(&dq_data_lock);
 493                         /* Add usage from quota entry into quota changes
 494                          * of our node. Auxiliary variables are important
 495                          * due to signedness */
 496                         spacechange = le64_to_cpu(dqblk->dqb_spacemod);
 497                         inodechange = le64_to_cpu(dqblk->dqb_inodemod);
 498                         dquot->dq_dqb.dqb_curspace += spacechange;
 499                         dquot->dq_dqb.dqb_curinodes += inodechange;
 500                         spin_unlock(&dq_data_lock);
 501                         /* We want to drop reference held by the crashed
 502                          * node. Since we have our own reference we know
 503                          * global structure actually won't be freed. */
 504                         status = ocfs2_global_release_dquot(dquot);
 505                         if (status < 0) {
 506                                 mlog_errno(status);
 507                                 goto out_commit;
 508                         }
 509                         /* Release local quota file entry */
 510                         status = ocfs2_journal_access_dq(handle,
 511                                         INODE_CACHE(lqinode),
 512                                         qbh, OCFS2_JOURNAL_ACCESS_WRITE);
 513                         if (status < 0) {
 514                                 mlog_errno(status);
 515                                 goto out_commit;
 516                         }
 517                         lock_buffer(qbh);
 518                         WARN_ON(!ocfs2_test_bit(bit, dchunk->dqc_bitmap));
 519                         ocfs2_clear_bit(bit, dchunk->dqc_bitmap);
 520                         le32_add_cpu(&dchunk->dqc_free, 1);
 521                         unlock_buffer(qbh);
 522                         ocfs2_journal_dirty(handle, qbh);
 523 out_commit:
 524                         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 525                         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 526 out_drop_lock:
 527                         ocfs2_unlock_global_qf(oinfo, 1);
 528 out_put_dquot:
 529                         dqput(dquot);
 530 out_put_bh:
 531                         brelse(qbh);
 532                         if (status < 0)
 533                                 break;
 534                 }
 535                 brelse(hbh);
 536                 list_del(&rchunk->rc_list);
 537                 kfree(rchunk->rc_bitmap);
 538                 kfree(rchunk);
 539                 if (status < 0)
 540                         break;
 541         }
 542         if (status < 0)
 543                 free_recovery_list(&(rec->r_list[type]));
 544         mlog_exit(status);
 545         return status;
 546 }
 547
 548 /* Recover local quota files for given node different from us */
 549 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
 550                                 struct ocfs2_quota_recovery *rec,
 551                                 int slot_num)
 552 {
 553         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 554                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 555         struct super_block *sb = osb->sb;
 556         struct ocfs2_local_disk_dqinfo *ldinfo;
 557         struct buffer_head *bh;
 558         handle_t *handle;
 559         int type;
 560         int status = 0;
 561         struct inode *lqinode;
 562         unsigned int flags;
 563
 564         mlog(ML_NOTICE, "Finishing quota recovery in slot %u\n", slot_num);
 565         mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
 566         for (type = 0; type < MAXQUOTAS; type++) {
 567                 if (list_empty(&(rec->r_list[type])))
 568                         continue;
 569                 mlog(0, "Recovering quota in slot %d\n", slot_num);
 570                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
 571                 if (!lqinode) {
 572                         status = -ENOENT;
 573                         goto out;
 574                 }
 575                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
 576                                                        OCFS2_META_LOCK_NOQUEUE);
 577                 /* Someone else is holding the lock? Then he must be
 578                  * doing the recovery. Just skip the file... */
 579                 if (status == -EAGAIN) {
 580                         mlog(ML_NOTICE, "skipping quota recovery for slot %d "
 581                              "because quota file is locked.\n", slot_num);
 582                         status = 0;
 583                         goto out_put;
 584                 } else if (status < 0) {
 585                         mlog_errno(status);
 586                         goto out_put;
 587                 }
 588                 /* Now read local header */
 589                 bh = NULL;
 590                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
 591                 if (status) {
 592                         mlog_errno(status);
 593                         mlog(ML_ERROR, "failed to read quota file info header "
 594                                 "(slot=%d type=%d)\n", slot_num, type);
 595                         goto out_lock;
 596                 }
 597                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 598                                                         OCFS2_LOCAL_INFO_OFF);
 599                 /* Is recovery still needed? */
 600                 flags = le32_to_cpu(ldinfo->dqi_flags);
 601                 if (!(flags & OLQF_CLEAN))
 602                         status = ocfs2_recover_local_quota_file(lqinode,
 603                                                                 type,
 604                                                                 rec);
 605                 /* We don't want to mark file as clean when it is actually
 606                  * active */
 607                 if (slot_num == osb->slot_num)
 608                         goto out_bh;
 609                 /* Mark quota file as clean if we are recovering quota file of
 610                  * some other node. */
 611                 handle = ocfs2_start_trans(osb,
 612                                            OCFS2_LOCAL_QINFO_WRITE_CREDITS);
 613                 if (IS_ERR(handle)) {
 614                         status = PTR_ERR(handle);
 615                         mlog_errno(status);
 616                         goto out_bh;
 617                 }
 618                 status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
 619                                                  bh,
 620                                                  OCFS2_JOURNAL_ACCESS_WRITE);
 621                 if (status < 0) {
 622                         mlog_errno(status);
 623                         goto out_trans;
 624                 }
 625                 lock_buffer(bh);
 626                 ldinfo->dqi_flags = cpu_to_le32(flags | OLQF_CLEAN);
 627                 unlock_buffer(bh);
 628                 ocfs2_journal_dirty(handle, bh);
 629 out_trans:
 630                 ocfs2_commit_trans(osb, handle);
 631 out_bh:
 632                 brelse(bh);
 633 out_lock:
 634                 ocfs2_inode_unlock(lqinode, 1);
 635 out_put:
 636                 iput(lqinode);
 637                 if (status < 0)
 638                         break;
 639         }
 640 out:
 641         mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 642         kfree(rec);
 643         return status;
 644 }
 645
 646 /* Read information header from quota file */
 647 static int ocfs2_local_read_info(struct super_block *sb, int type)
 648 {
 649         struct ocfs2_local_disk_dqinfo *ldinfo;
 650         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 651         struct ocfs2_mem_dqinfo *oinfo;
 652         struct inode *lqinode = sb_dqopt(sb)->files[type];
 653         int status;
 654         struct buffer_head *bh = NULL;
 655         struct ocfs2_quota_recovery *rec;
 656         int locked = 0;
 657
 658         /* We don't need the lock and we have to acquire quota file locks
 659          * which will later depend on this lock */
 660         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 661         info->dqi_maxblimit = 0x7fffffffffffffffLL;
 662         info->dqi_maxilimit = 0x7fffffffffffffffLL;
 663         oinfo = kmalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
 664         if (!oinfo) {
 665                 mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
 666                                " info.");
 667                 goto out_err;
 668         }
 669         info->dqi_priv = oinfo;
 670         oinfo->dqi_type = type;
 671         INIT_LIST_HEAD(&oinfo->dqi_chunk);
 672         oinfo->dqi_rec = NULL;
 673         oinfo->dqi_lqi_bh = NULL;
 674         oinfo->dqi_ibh = NULL;
 675
 676         status = ocfs2_global_read_info(sb, type);
 677         if (status < 0)
 678                 goto out_err;
 679
 680         status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
 681         if (status < 0) {
 682                 mlog_errno(status);
 683                 goto out_err;
 684         }
 685         locked = 1;
 686
 687         /* Now read local header */
 688         status = ocfs2_read_quota_block(lqinode, 0, &bh);
 689         if (status) {
 690                 mlog_errno(status);
 691                 mlog(ML_ERROR, "failed to read quota file info header "
 692                         "(type=%d)\n", type);
 693                 goto out_err;
 694         }
 695         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 696                                                 OCFS2_LOCAL_INFO_OFF);
 697         info->dqi_flags = le32_to_cpu(ldinfo->dqi_flags);
 698         oinfo->dqi_chunks = le32_to_cpu(ldinfo->dqi_chunks);
 699         oinfo->dqi_blocks = le32_to_cpu(ldinfo->dqi_blocks);
 700         oinfo->dqi_ibh = bh;
 701
 702         /* We crashed when using local quota file? */
 703         if (!(info->dqi_flags & OLQF_CLEAN)) {
 704                 rec = OCFS2_SB(sb)->quota_rec;
 705                 if (!rec) {
 706                         rec = ocfs2_alloc_quota_recovery();
 707                         if (!rec) {
 708                                 status = -ENOMEM;
 709                                 mlog_errno(status);
 710                                 goto out_err;
 711                         }
 712                         OCFS2_SB(sb)->quota_rec = rec;
 713                 }
 714
 715                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 716                                                    &rec->r_list[type]);
 717                 if (status < 0) {
 718                         mlog_errno(status);
 719                         goto out_err;
 720                 }
 721         }
 722
 723         status = ocfs2_load_local_quota_bitmaps(lqinode,
 724                                                 ldinfo,
 725                                                 &oinfo->dqi_chunk);
 726         if (status < 0) {
 727                 mlog_errno(status);
 728                 goto out_err;
 729         }
 730
 731         /* Now mark quota file as used */
 732         info->dqi_flags &= ~OLQF_CLEAN;
 733         status = ocfs2_modify_bh(lqinode, bh, olq_update_info, info);
 734         if (status < 0) {
 735                 mlog_errno(status);
 736                 goto out_err;
 737         }
 738
 739         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 740         return 0;
 741 out_err:
 742         if (oinfo) {
 743                 iput(oinfo->dqi_gqinode);
 744                 ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 745                 ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 746                 brelse(oinfo->dqi_lqi_bh);
 747                 if (locked)
 748                         ocfs2_inode_unlock(lqinode, 1);
 749                 ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 750                 kfree(oinfo);
 751         }
 752         brelse(bh);
 753         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 754         return -1;
 755 }
 756
 757 /* Write local info to quota file */
 758 static int ocfs2_local_write_info(struct super_block *sb, int type)
 759 {
 760         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 761         struct buffer_head *bh = ((struct ocfs2_mem_dqinfo *)info->dqi_priv)
 762                                                 ->dqi_ibh;
 763         int status;
 764
 765         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type], bh, olq_update_info,
 766                                  info);
 767         if (status < 0) {
 768                 mlog_errno(status);
 769                 return -1;
 770         }
 771
 772         return 0;
 773 }
 774
 775 /* Release info from memory */
 776 static int ocfs2_local_free_info(struct super_block *sb, int type)
 777 {
 778         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 779         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 780         struct ocfs2_quota_chunk *chunk;
 781         struct ocfs2_local_disk_chunk *dchunk;
 782         int mark_clean = 1, len;
 783         int status;
 784
 785         /* At this point we know there are no more dquots and thus
 786          * even if there's some sync in the pdflush queue, it won't
 787          * find any dquots and return without doing anything */
 788         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 789         iput(oinfo->dqi_gqinode);
 790         ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 791         ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 792         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 793                 dchunk = (struct ocfs2_local_disk_chunk *)
 794                                         (chunk->qc_headerbh->b_data);
 795                 if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 796                         len = ol_chunk_entries(sb);
 797                 } else {
 798                         len = (oinfo->dqi_blocks -
 799                                ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 800                               * ol_quota_entries_per_block(sb);
 801                 }
 802                 /* Not all entries free? Bug! */
 803                 if (le32_to_cpu(dchunk->dqc_free) != len) {
 804                         mlog(ML_ERROR, "releasing quota file with used "
 805                                         "entries (type=%d)\n", type);
 806                         mark_clean = 0;
 807                 }
 808         }
 809         ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 810
 811         /* dqonoff_mutex protects us against racing with recovery thread... */
 812         if (oinfo->dqi_rec) {
 813                 ocfs2_free_quota_recovery(oinfo->dqi_rec);
 814                 mark_clean = 0;
 815         }
 816
 817         if (!mark_clean)
 818                 goto out;
 819
 820         /* Mark local file as clean */
 821         info->dqi_flags |= OLQF_CLEAN;
 822         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type],
 823                                  oinfo->dqi_ibh,
 824                                  olq_update_info,
 825                                  info);
 826         if (status < 0) {
 827                 mlog_errno(status);
 828                 goto out;
 829         }
 830
 831 out:
 832         ocfs2_inode_unlock(sb_dqopt(sb)->files[type], 1);
 833         brelse(oinfo->dqi_ibh);
 834         brelse(oinfo->dqi_lqi_bh);
 835         kfree(oinfo);
 836         return 0;
 837 }
 838
 839 static void olq_set_dquot(struct buffer_head *bh, void *private)
 840 {
 841         struct ocfs2_dquot *od = private;
 842         struct ocfs2_local_disk_dqblk *dqblk;
 843         struct super_block *sb = od->dq_dquot.dq_sb;
 844
 845         dqblk = (struct ocfs2_local_disk_dqblk *)(bh->b_data
 846                 + ol_dqblk_block_offset(sb, od->dq_local_off));
 847
 848         dqblk->dqb_id = cpu_to_le64(od->dq_dquot.dq_id);
 849         spin_lock(&dq_data_lock);
 850         dqblk->dqb_spacemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curspace -
 851                                           od->dq_origspace);
 852         dqblk->dqb_inodemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curinodes -
 853                                           od->dq_originodes);
 854         spin_unlock(&dq_data_lock);
 855         mlog(0, "Writing local dquot %u space %lld inodes %lld\n",
 856              od->dq_dquot.dq_id, (long long)le64_to_cpu(dqblk->dqb_spacemod),
 857              (long long)le64_to_cpu(dqblk->dqb_inodemod));
 858 }
 859
 860 /* Write dquot to local quota file */
 861 static int ocfs2_local_write_dquot(struct dquot *dquot)
 862 {
 863         struct super_block *sb = dquot->dq_sb;
 864         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
 865         struct buffer_head *bh;
 866         struct inode *lqinode = sb_dqopt(sb)->files[dquot->dq_type];
 867         int status;
 868
 869         status = ocfs2_read_quota_phys_block(lqinode, od->dq_local_phys_blk,
 870                                              &bh);
 871         if (status) {
 872                 mlog_errno(status);
 873                 goto out;
 874         }
 875         status = ocfs2_modify_bh(lqinode, bh, olq_set_dquot, od);
 876         if (status < 0) {
 877                 mlog_errno(status);
 878                 goto out;
 879         }
 880 out:
 881         brelse(bh);
 882         return status;
 883 }
 884
 885 /* Find free entry in local quota file */
 886 static struct ocfs2_quota_chunk *ocfs2_find_free_entry(struct super_block *sb,
 887                                                        int type,
 888                                                        int *offset)
 889 {
 890         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 891         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 892         struct ocfs2_quota_chunk *chunk;
 893         struct ocfs2_local_disk_chunk *dchunk;
 894         int found = 0, len;
 895
 896         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 897                 dchunk = (struct ocfs2_local_disk_chunk *)
 898                                                 chunk->qc_headerbh->b_data;
 899                 if (le32_to_cpu(dchunk->dqc_free) > 0) {
 900                         found = 1;
 901                         break;
 902                 }
 903         }
 904         if (!found)
 905                 return NULL;
 906
 907         if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 908                 len = ol_chunk_entries(sb);
 909         } else {
 910                 len = (oinfo->dqi_blocks -
 911                        ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 912                       * ol_quota_entries_per_block(sb);
 913         }
 914
 915         found = ocfs2_find_next_zero_bit(dchunk->dqc_bitmap, len, 0);
 916         /* We failed? */
 917         if (found == len) {
 918                 mlog(ML_ERROR, "Did not find empty entry in chunk %d with %u"
 919                      " entries free (type=%d)\n", chunk->qc_num,
 920                      le32_to_cpu(dchunk->dqc_free), type);
 921                 return ERR_PTR(-EIO);
 922         }
 923         *offset = found;
 924         return chunk;
 925 }
 926
 927 /* Add new chunk to the local quota file */
 928 static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
 929                                                         struct super_block *sb,
 930                                                         int type,
 931                                                         int *offset)
 932 {
 933         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 934         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 935         struct inode *lqinode = sb_dqopt(sb)->files[type];
 936         struct ocfs2_quota_chunk *chunk = NULL;
 937         struct ocfs2_local_disk_chunk *dchunk;
 938         int status;
 939         handle_t *handle;
 940         struct buffer_head *bh = NULL, *dbh = NULL;
 941         u64 p_blkno;
 942
 943         /* We are protected by dqio_sem so no locking needed */
 944         status = ocfs2_extend_no_holes(lqinode,
 945                                        lqinode->i_size + 2 * sb->s_blocksize,
 946                                        lqinode->i_size);
 947         if (status < 0) {
 948                 mlog_errno(status);
 949                 goto out;
 950         }
 951         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
 952                                           lqinode->i_size + 2 * sb->s_blocksize);
 953         if (status < 0) {
 954                 mlog_errno(status);
 955                 goto out;
 956         }
 957
 958         chunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
 959         if (!chunk) {
 960                 status = -ENOMEM;
 961                 mlog_errno(status);
 962                 goto out;
 963         }
 964         /* Local quota info and two new blocks we initialize */
 965         handle = ocfs2_start_trans(OCFS2_SB(sb),
 966                         OCFS2_LOCAL_QINFO_WRITE_CREDITS +
 967                         2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
 968         if (IS_ERR(handle)) {
 969                 status = PTR_ERR(handle);
 970                 mlog_errno(status);
 971                 goto out;
 972         }
 973
 974         /* Initialize chunk header */
 975         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
 976         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
 977                                              &p_blkno, NULL, NULL);
 978         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
 979         if (status < 0) {
 980                 mlog_errno(status);
 981                 goto out_trans;
 982         }
 983         bh = sb_getblk(sb, p_blkno);
 984         if (!bh) {
 985                 status = -ENOMEM;
 986                 mlog_errno(status);
 987                 goto out_trans;
 988         }
 989         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
 990         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
 991         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
 992                                          OCFS2_JOURNAL_ACCESS_CREATE);
 993         if (status < 0) {
 994                 mlog_errno(status);
 995                 goto out_trans;
 996         }
 997         lock_buffer(bh);
 998         dchunk->dqc_free = cpu_to_le32(ol_quota_entries_per_block(sb));
 999         memset(dchunk->dqc_bitmap, 0,
1000                sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
1001                OCFS2_QBLK_RESERVED_SPACE);
1002         unlock_buffer(bh);
1003         ocfs2_journal_dirty(handle, bh);
1004
1005         /* Initialize new block with structures */
1006         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1007         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks + 1,
1008                                              &p_blkno, NULL, NULL);
1009         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1010         if (status < 0) {
1011                 mlog_errno(status);
1012                 goto out_trans;
1013         }
1014         dbh = sb_getblk(sb, p_blkno);
1015         if (!dbh) {
1016                 status = -ENOMEM;
1017                 mlog_errno(status);
1018                 goto out_trans;
1019         }
1020         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), dbh);
1021         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), dbh,
1022                                          OCFS2_JOURNAL_ACCESS_CREATE);
1023         if (status < 0) {
1024                 mlog_errno(status);
1025                 goto out_trans;
1026         }
1027         lock_buffer(dbh);
1028         memset(dbh->b_data, 0, sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE);
1029         unlock_buffer(dbh);
1030         ocfs2_journal_dirty(handle, dbh);
1031
1032         /* Update local quotafile info */
1033         oinfo->dqi_blocks += 2;
1034         oinfo->dqi_chunks++;
1035         status = ocfs2_local_write_info(sb, type);
1036         if (status < 0) {
1037                 mlog_errno(status);
1038                 goto out_trans;
1039         }
1040         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1041         if (status < 0) {
1042                 mlog_errno(status);
1043                 goto out;
1044         }
1045
1046         list_add_tail(&chunk->qc_chunk, &oinfo->dqi_chunk);
1047         chunk->qc_num = list_entry(chunk->qc_chunk.prev,
1048                                    struct ocfs2_quota_chunk,
1049                                    qc_chunk)->qc_num + 1;
1050         chunk->qc_headerbh = bh;
1051         *offset = 0;
1052         return chunk;
1053 out_trans:
1054         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1055 out:
1056         brelse(bh);
1057         brelse(dbh);
1058         kmem_cache_free(ocfs2_qf_chunk_cachep, chunk);
1059         return ERR_PTR(status);
1060 }
1061
1062 /* Find free entry in local quota file */
1063 static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
1064                                                        struct super_block *sb,
1065                                                        int type,
1066                                                        int *offset)
1067 {
1068         struct mem_dqinfo *info = sb_dqinfo(sb, type);
1069         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
1070         struct ocfs2_quota_chunk *chunk;
1071         struct inode *lqinode = sb_dqopt(sb)->files[type];
1072         struct ocfs2_local_disk_chunk *dchunk;
1073         int epb = ol_quota_entries_per_block(sb);
1074         unsigned int chunk_blocks;
1075         struct buffer_head *bh;
1076         u64 p_blkno;
1077         int status;
1078         handle_t *handle;
1079
1080         if (list_empty(&oinfo->dqi_chunk))
1081                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1082         /* Is the last chunk full? */
1083         chunk = list_entry(oinfo->dqi_chunk.prev,
1084                         struct ocfs2_quota_chunk, qc_chunk);
1085         chunk_blocks = oinfo->dqi_blocks -
1086                         ol_quota_chunk_block(sb, chunk->qc_num) - 1;
1087         if (ol_chunk_blocks(sb) == chunk_blocks)
1088                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1089
1090         /* We are protected by dqio_sem so no locking needed */
1091         status = ocfs2_extend_no_holes(lqinode,
1092                                        lqinode->i_size + sb->s_blocksize,
1093                                        lqinode->i_size);
1094         if (status < 0) {
1095                 mlog_errno(status);
1096                 goto out;
1097         }
1098         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
1099                                           lqinode->i_size + sb->s_blocksize);
1100         if (status < 0) {
1101                 mlog_errno(status);
1102                 goto out;
1103         }
1104
1105         /* Get buffer from the just added block */
1106         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1107         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
1108                                              &p_blkno, NULL, NULL);
1109         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1110         if (status < 0) {
1111                 mlog_errno(status);
1112                 goto out;
1113         }
1114         bh = sb_getblk(sb, p_blkno);
1115         if (!bh) {
1116                 status = -ENOMEM;
1117                 mlog_errno(status);
1118                 goto out;
1119         }
1120         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
1121
1122         /* Local quota info, chunk header and the new block we initialize */
1123         handle = ocfs2_start_trans(OCFS2_SB(sb),
1124                         OCFS2_LOCAL_QINFO_WRITE_CREDITS +
1125                         2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
1126         if (IS_ERR(handle)) {
1127                 status = PTR_ERR(handle);
1128                 mlog_errno(status);
1129                 goto out;
1130         }
1131         /* Zero created block */
1132         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
1133                                  OCFS2_JOURNAL_ACCESS_CREATE);
1134         if (status < 0) {
1135                 mlog_errno(status);
1136                 goto out_trans;
1137         }
1138         lock_buffer(bh);
1139         memset(bh->b_data, 0, sb->s_blocksize);
1140         unlock_buffer(bh);
1141         ocfs2_journal_dirty(handle, bh);
1142
1143         /* Update chunk header */
1144         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
1145                                          chunk->qc_headerbh,
1146                                  OCFS2_JOURNAL_ACCESS_WRITE);
1147         if (status < 0) {
1148                 mlog_errno(status);
1149                 goto out_trans;
1150         }
1151
1152         dchunk = (struct ocfs2_local_disk_chunk *)chunk->qc_headerbh->b_data;
1153         lock_buffer(chunk->qc_headerbh);
1154         le32_add_cpu(&dchunk->dqc_free, ol_quota_entries_per_block(sb));
1155         unlock_buffer(chunk->qc_headerbh);
1156         ocfs2_journal_dirty(handle, chunk->qc_headerbh);
1157
1158         /* Update file header */
1159         oinfo->dqi_blocks++;
1160         status = ocfs2_local_write_info(sb, type);
1161         if (status < 0) {
1162                 mlog_errno(status);
1163                 goto out_trans;
1164         }
1165
1166         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1167         if (status < 0) {
1168                 mlog_errno(status);
1169                 goto out;
1170         }
1171         *offset = chunk_blocks * epb;
1172         return chunk;
1173 out_trans:
1174         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1175 out:
1176         return ERR_PTR(status);
1177 }
1178
1179 static void olq_alloc_dquot(struct buffer_head *bh, void *private)
1180 {
1181         int *offset = private;
1182         struct ocfs2_local_disk_chunk *dchunk;
1183
1184         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
1185         ocfs2_set_bit(*offset, dchunk->dqc_bitmap);
1186         le32_add_cpu(&dchunk->dqc_free, -1);
1187 }
1188
1189 /* Create dquot in the local file for given id */
1190 static int ocfs2_create_local_dquot(struct dquot *dquot)
1191 {
1192         struct super_block *sb = dquot->dq_sb;
1193         int type = dquot->dq_type;
1194         struct inode *lqinode = sb_dqopt(sb)->files[type];
1195         struct ocfs2_quota_chunk *chunk;
1196         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1197         int offset;
1198         int status;
1199         u64 pcount;
1200
1201         down_write(&OCFS2_I(lqinode)->ip_alloc_sem);
1202         chunk = ocfs2_find_free_entry(sb, type, &offset);
1203         if (!chunk) {
1204                 chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
1205                 if (IS_ERR(chunk)) {
1206                         status = PTR_ERR(chunk);
1207                         goto out;
1208                 }
1209         } else if (IS_ERR(chunk)) {
1210                 status = PTR_ERR(chunk);
1211                 goto out;
1212         }
1213         od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
1214         od->dq_chunk = chunk;
1215         status = ocfs2_extent_map_get_blocks(lqinode,
1216                                      ol_dqblk_block(sb, chunk->qc_num, offset),
1217                                      &od->dq_local_phys_blk,
1218                                      &pcount,
1219                                      NULL);
1220
1221         /* Initialize dquot structure on disk */
1222         status = ocfs2_local_write_dquot(dquot);
1223         if (status < 0) {
1224                 mlog_errno(status);
1225                 goto out;
1226         }
1227
1228         /* Mark structure as allocated */
1229         status = ocfs2_modify_bh(lqinode, chunk->qc_headerbh, olq_alloc_dquot,
1230                                  &offset);
1231         if (status < 0) {
1232                 mlog_errno(status);
1233                 goto out;
1234         }
1235 out:
1236         up_write(&OCFS2_I(lqinode)->ip_alloc_sem);
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,
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(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         .read_dqblk             = ocfs2_local_read_dquot,
1319         .commit_dqblk           = ocfs2_local_write_dquot,
1320         .release_dqblk          = ocfs2_local_release_dquot,
1321 };
1322
1323 struct quota_format_type ocfs2_quota_format = {
1324         .qf_fmt_id = QFMT_OCFS2,
1325         .qf_ops = &ocfs2_format_ops,
1326         .qf_owner = THIS_MODULE
1327 };