fs: dcache scale dentry refcount
[linux-2.6.git] / 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 #include "super.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         mlog(ML_NOTICE, "Beginning quota recovery in slot %u\n", slot_num);
408         rec = ocfs2_alloc_quota_recovery();
409         if (!rec)
410                 return ERR_PTR(-ENOMEM);
411         /* First init... */
412
413         for (type = 0; type < MAXQUOTAS; type++) {
414                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
415                         continue;
416                 /* At this point, journal of the slot is already replayed so
417                  * we can trust metadata and data of the quota file */
418                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
419                 if (!lqinode) {
420                         status = -ENOENT;
421                         goto out;
422                 }
423                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
424                                                OCFS2_META_LOCK_RECOVERY);
425                 if (status < 0) {
426                         mlog_errno(status);
427                         goto out_put;
428                 }
429                 /* Now read local header */
430                 bh = NULL;
431                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
432                 if (status) {
433                         mlog_errno(status);
434                         mlog(ML_ERROR, "failed to read quota file info header "
435                                 "(slot=%d type=%d)\n", slot_num, type);
436                         goto out_lock;
437                 }
438                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
439                                                         OCFS2_LOCAL_INFO_OFF);
440                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
441                                                    &rec->r_list[type]);
442                 brelse(bh);
443 out_lock:
444                 ocfs2_inode_unlock(lqinode, 1);
445 out_put:
446                 iput(lqinode);
447                 if (status < 0)
448                         break;
449         }
450 out:
451         if (status < 0) {
452                 ocfs2_free_quota_recovery(rec);
453                 rec = ERR_PTR(status);
454         }
455         return rec;
456 }
457
458 /* Sync changes in local quota file into global quota file and
459  * reinitialize local quota file.
460  * The function expects local quota file to be already locked and
461  * dqonoff_mutex locked. */
462 static int ocfs2_recover_local_quota_file(struct inode *lqinode,
463                                           int type,
464                                           struct ocfs2_quota_recovery *rec)
465 {
466         struct super_block *sb = lqinode->i_sb;
467         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
468         struct ocfs2_local_disk_chunk *dchunk;
469         struct ocfs2_local_disk_dqblk *dqblk;
470         struct dquot *dquot;
471         handle_t *handle;
472         struct buffer_head *hbh = NULL, *qbh = NULL;
473         int status = 0;
474         int bit, chunk;
475         struct ocfs2_recovery_chunk *rchunk, *next;
476         qsize_t spacechange, inodechange;
477
478         mlog_entry("ino=%lu type=%u", (unsigned long)lqinode->i_ino, type);
479
480         list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
481                 chunk = rchunk->rc_chunk;
482                 hbh = NULL;
483                 status = ocfs2_read_quota_block(lqinode,
484                                                 ol_quota_chunk_block(sb, chunk),
485                                                 &hbh);
486                 if (status) {
487                         mlog_errno(status);
488                         break;
489                 }
490                 dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
491                 for_each_set_bit(bit, rchunk->rc_bitmap, ol_chunk_entries(sb)) {
492                         qbh = NULL;
493                         status = ocfs2_read_quota_block(lqinode,
494                                                 ol_dqblk_block(sb, chunk, bit),
495                                                 &qbh);
496                         if (status) {
497                                 mlog_errno(status);
498                                 break;
499                         }
500                         dqblk = (struct ocfs2_local_disk_dqblk *)(qbh->b_data +
501                                 ol_dqblk_block_off(sb, chunk, bit));
502                         dquot = dqget(sb, le64_to_cpu(dqblk->dqb_id), type);
503                         if (!dquot) {
504                                 status = -EIO;
505                                 mlog(ML_ERROR, "Failed to get quota structure "
506                                      "for id %u, type %d. Cannot finish quota "
507                                      "file recovery.\n",
508                                      (unsigned)le64_to_cpu(dqblk->dqb_id),
509                                      type);
510                                 goto out_put_bh;
511                         }
512                         status = ocfs2_lock_global_qf(oinfo, 1);
513                         if (status < 0) {
514                                 mlog_errno(status);
515                                 goto out_put_dquot;
516                         }
517
518                         handle = ocfs2_start_trans(OCFS2_SB(sb),
519                                                    OCFS2_QSYNC_CREDITS);
520                         if (IS_ERR(handle)) {
521                                 status = PTR_ERR(handle);
522                                 mlog_errno(status);
523                                 goto out_drop_lock;
524                         }
525                         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
526                         spin_lock(&dq_data_lock);
527                         /* Add usage from quota entry into quota changes
528                          * of our node. Auxiliary variables are important
529                          * due to signedness */
530                         spacechange = le64_to_cpu(dqblk->dqb_spacemod);
531                         inodechange = le64_to_cpu(dqblk->dqb_inodemod);
532                         dquot->dq_dqb.dqb_curspace += spacechange;
533                         dquot->dq_dqb.dqb_curinodes += inodechange;
534                         spin_unlock(&dq_data_lock);
535                         /* We want to drop reference held by the crashed
536                          * node. Since we have our own reference we know
537                          * global structure actually won't be freed. */
538                         status = ocfs2_global_release_dquot(dquot);
539                         if (status < 0) {
540                                 mlog_errno(status);
541                                 goto out_commit;
542                         }
543                         /* Release local quota file entry */
544                         status = ocfs2_journal_access_dq(handle,
545                                         INODE_CACHE(lqinode),
546                                         qbh, OCFS2_JOURNAL_ACCESS_WRITE);
547                         if (status < 0) {
548                                 mlog_errno(status);
549                                 goto out_commit;
550                         }
551                         lock_buffer(qbh);
552                         WARN_ON(!ocfs2_test_bit(bit, dchunk->dqc_bitmap));
553                         ocfs2_clear_bit(bit, dchunk->dqc_bitmap);
554                         le32_add_cpu(&dchunk->dqc_free, 1);
555                         unlock_buffer(qbh);
556                         ocfs2_journal_dirty(handle, qbh);
557 out_commit:
558                         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
559                         ocfs2_commit_trans(OCFS2_SB(sb), handle);
560 out_drop_lock:
561                         ocfs2_unlock_global_qf(oinfo, 1);
562 out_put_dquot:
563                         dqput(dquot);
564 out_put_bh:
565                         brelse(qbh);
566                         if (status < 0)
567                                 break;
568                 }
569                 brelse(hbh);
570                 list_del(&rchunk->rc_list);
571                 kfree(rchunk->rc_bitmap);
572                 kfree(rchunk);
573                 if (status < 0)
574                         break;
575         }
576         if (status < 0)
577                 free_recovery_list(&(rec->r_list[type]));
578         mlog_exit(status);
579         return status;
580 }
581
582 /* Recover local quota files for given node different from us */
583 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
584                                 struct ocfs2_quota_recovery *rec,
585                                 int slot_num)
586 {
587         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
588                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
589         struct super_block *sb = osb->sb;
590         struct ocfs2_local_disk_dqinfo *ldinfo;
591         struct buffer_head *bh;
592         handle_t *handle;
593         int type;
594         int status = 0;
595         struct inode *lqinode;
596         unsigned int flags;
597
598         mlog(ML_NOTICE, "Finishing quota recovery in slot %u\n", slot_num);
599         mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
600         for (type = 0; type < MAXQUOTAS; type++) {
601                 if (list_empty(&(rec->r_list[type])))
602                         continue;
603                 mlog(0, "Recovering quota in slot %d\n", slot_num);
604                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
605                 if (!lqinode) {
606                         status = -ENOENT;
607                         goto out;
608                 }
609                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
610                                                        OCFS2_META_LOCK_NOQUEUE);
611                 /* Someone else is holding the lock? Then he must be
612                  * doing the recovery. Just skip the file... */
613                 if (status == -EAGAIN) {
614                         mlog(ML_NOTICE, "skipping quota recovery for slot %d "
615                              "because quota file is locked.\n", slot_num);
616                         status = 0;
617                         goto out_put;
618                 } else if (status < 0) {
619                         mlog_errno(status);
620                         goto out_put;
621                 }
622                 /* Now read local header */
623                 bh = NULL;
624                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
625                 if (status) {
626                         mlog_errno(status);
627                         mlog(ML_ERROR, "failed to read quota file info header "
628                                 "(slot=%d type=%d)\n", slot_num, type);
629                         goto out_lock;
630                 }
631                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
632                                                         OCFS2_LOCAL_INFO_OFF);
633                 /* Is recovery still needed? */
634                 flags = le32_to_cpu(ldinfo->dqi_flags);
635                 if (!(flags & OLQF_CLEAN))
636                         status = ocfs2_recover_local_quota_file(lqinode,
637                                                                 type,
638                                                                 rec);
639                 /* We don't want to mark file as clean when it is actually
640                  * active */
641                 if (slot_num == osb->slot_num)
642                         goto out_bh;
643                 /* Mark quota file as clean if we are recovering quota file of
644                  * some other node. */
645                 handle = ocfs2_start_trans(osb,
646                                            OCFS2_LOCAL_QINFO_WRITE_CREDITS);
647                 if (IS_ERR(handle)) {
648                         status = PTR_ERR(handle);
649                         mlog_errno(status);
650                         goto out_bh;
651                 }
652                 status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
653                                                  bh,
654                                                  OCFS2_JOURNAL_ACCESS_WRITE);
655                 if (status < 0) {
656                         mlog_errno(status);
657                         goto out_trans;
658                 }
659                 lock_buffer(bh);
660                 ldinfo->dqi_flags = cpu_to_le32(flags | OLQF_CLEAN);
661                 unlock_buffer(bh);
662                 ocfs2_journal_dirty(handle, bh);
663 out_trans:
664                 ocfs2_commit_trans(osb, handle);
665 out_bh:
666                 brelse(bh);
667 out_lock:
668                 ocfs2_inode_unlock(lqinode, 1);
669 out_put:
670                 iput(lqinode);
671                 if (status < 0)
672                         break;
673         }
674 out:
675         mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
676         kfree(rec);
677         return status;
678 }
679
680 /* Read information header from quota file */
681 static int ocfs2_local_read_info(struct super_block *sb, int type)
682 {
683         struct ocfs2_local_disk_dqinfo *ldinfo;
684         struct mem_dqinfo *info = sb_dqinfo(sb, type);
685         struct ocfs2_mem_dqinfo *oinfo;
686         struct inode *lqinode = sb_dqopt(sb)->files[type];
687         int status;
688         struct buffer_head *bh = NULL;
689         struct ocfs2_quota_recovery *rec;
690         int locked = 0;
691
692         /* We don't need the lock and we have to acquire quota file locks
693          * which will later depend on this lock */
694         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
695         info->dqi_maxblimit = 0x7fffffffffffffffLL;
696         info->dqi_maxilimit = 0x7fffffffffffffffLL;
697         oinfo = kmalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
698         if (!oinfo) {
699                 mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
700                                " info.");
701                 goto out_err;
702         }
703         info->dqi_priv = oinfo;
704         oinfo->dqi_type = type;
705         INIT_LIST_HEAD(&oinfo->dqi_chunk);
706         oinfo->dqi_rec = NULL;
707         oinfo->dqi_lqi_bh = NULL;
708         oinfo->dqi_libh = NULL;
709
710         status = ocfs2_global_read_info(sb, type);
711         if (status < 0)
712                 goto out_err;
713
714         status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
715         if (status < 0) {
716                 mlog_errno(status);
717                 goto out_err;
718         }
719         locked = 1;
720
721         /* Now read local header */
722         status = ocfs2_read_quota_block(lqinode, 0, &bh);
723         if (status) {
724                 mlog_errno(status);
725                 mlog(ML_ERROR, "failed to read quota file info header "
726                         "(type=%d)\n", type);
727                 goto out_err;
728         }
729         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
730                                                 OCFS2_LOCAL_INFO_OFF);
731         info->dqi_flags = le32_to_cpu(ldinfo->dqi_flags);
732         oinfo->dqi_chunks = le32_to_cpu(ldinfo->dqi_chunks);
733         oinfo->dqi_blocks = le32_to_cpu(ldinfo->dqi_blocks);
734         oinfo->dqi_libh = bh;
735
736         /* We crashed when using local quota file? */
737         if (!(info->dqi_flags & OLQF_CLEAN)) {
738                 rec = OCFS2_SB(sb)->quota_rec;
739                 if (!rec) {
740                         rec = ocfs2_alloc_quota_recovery();
741                         if (!rec) {
742                                 status = -ENOMEM;
743                                 mlog_errno(status);
744                                 goto out_err;
745                         }
746                         OCFS2_SB(sb)->quota_rec = rec;
747                 }
748
749                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
750                                                    &rec->r_list[type]);
751                 if (status < 0) {
752                         mlog_errno(status);
753                         goto out_err;
754                 }
755         }
756
757         status = ocfs2_load_local_quota_bitmaps(lqinode,
758                                                 ldinfo,
759                                                 &oinfo->dqi_chunk);
760         if (status < 0) {
761                 mlog_errno(status);
762                 goto out_err;
763         }
764
765         /* Now mark quota file as used */
766         info->dqi_flags &= ~OLQF_CLEAN;
767         status = ocfs2_modify_bh(lqinode, bh, olq_update_info, info);
768         if (status < 0) {
769                 mlog_errno(status);
770                 goto out_err;
771         }
772
773         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
774         return 0;
775 out_err:
776         if (oinfo) {
777                 iput(oinfo->dqi_gqinode);
778                 ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
779                 ocfs2_lock_res_free(&oinfo->dqi_gqlock);
780                 brelse(oinfo->dqi_lqi_bh);
781                 if (locked)
782                         ocfs2_inode_unlock(lqinode, 1);
783                 ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
784                 kfree(oinfo);
785         }
786         brelse(bh);
787         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
788         return -1;
789 }
790
791 /* Write local info to quota file */
792 static int ocfs2_local_write_info(struct super_block *sb, int type)
793 {
794         struct mem_dqinfo *info = sb_dqinfo(sb, type);
795         struct buffer_head *bh = ((struct ocfs2_mem_dqinfo *)info->dqi_priv)
796                                                 ->dqi_libh;
797         int status;
798
799         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type], bh, olq_update_info,
800                                  info);
801         if (status < 0) {
802                 mlog_errno(status);
803                 return -1;
804         }
805
806         return 0;
807 }
808
809 /* Release info from memory */
810 static int ocfs2_local_free_info(struct super_block *sb, int type)
811 {
812         struct mem_dqinfo *info = sb_dqinfo(sb, type);
813         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
814         struct ocfs2_quota_chunk *chunk;
815         struct ocfs2_local_disk_chunk *dchunk;
816         int mark_clean = 1, len;
817         int status;
818
819         iput(oinfo->dqi_gqinode);
820         ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
821         ocfs2_lock_res_free(&oinfo->dqi_gqlock);
822         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
823                 dchunk = (struct ocfs2_local_disk_chunk *)
824                                         (chunk->qc_headerbh->b_data);
825                 if (chunk->qc_num < oinfo->dqi_chunks - 1) {
826                         len = ol_chunk_entries(sb);
827                 } else {
828                         len = (oinfo->dqi_blocks -
829                                ol_quota_chunk_block(sb, chunk->qc_num) - 1)
830                               * ol_quota_entries_per_block(sb);
831                 }
832                 /* Not all entries free? Bug! */
833                 if (le32_to_cpu(dchunk->dqc_free) != len) {
834                         mlog(ML_ERROR, "releasing quota file with used "
835                                         "entries (type=%d)\n", type);
836                         mark_clean = 0;
837                 }
838         }
839         ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
840
841         /* dqonoff_mutex protects us against racing with recovery thread... */
842         if (oinfo->dqi_rec) {
843                 ocfs2_free_quota_recovery(oinfo->dqi_rec);
844                 mark_clean = 0;
845         }
846
847         if (!mark_clean)
848                 goto out;
849
850         /* Mark local file as clean */
851         info->dqi_flags |= OLQF_CLEAN;
852         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type],
853                                  oinfo->dqi_libh,
854                                  olq_update_info,
855                                  info);
856         if (status < 0) {
857                 mlog_errno(status);
858                 goto out;
859         }
860
861 out:
862         ocfs2_inode_unlock(sb_dqopt(sb)->files[type], 1);
863         brelse(oinfo->dqi_libh);
864         brelse(oinfo->dqi_lqi_bh);
865         kfree(oinfo);
866         return 0;
867 }
868
869 static void olq_set_dquot(struct buffer_head *bh, void *private)
870 {
871         struct ocfs2_dquot *od = private;
872         struct ocfs2_local_disk_dqblk *dqblk;
873         struct super_block *sb = od->dq_dquot.dq_sb;
874
875         dqblk = (struct ocfs2_local_disk_dqblk *)(bh->b_data
876                 + ol_dqblk_block_offset(sb, od->dq_local_off));
877
878         dqblk->dqb_id = cpu_to_le64(od->dq_dquot.dq_id);
879         spin_lock(&dq_data_lock);
880         dqblk->dqb_spacemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curspace -
881                                           od->dq_origspace);
882         dqblk->dqb_inodemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curinodes -
883                                           od->dq_originodes);
884         spin_unlock(&dq_data_lock);
885         mlog(0, "Writing local dquot %u space %lld inodes %lld\n",
886              od->dq_dquot.dq_id, (long long)le64_to_cpu(dqblk->dqb_spacemod),
887              (long long)le64_to_cpu(dqblk->dqb_inodemod));
888 }
889
890 /* Write dquot to local quota file */
891 int ocfs2_local_write_dquot(struct dquot *dquot)
892 {
893         struct super_block *sb = dquot->dq_sb;
894         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
895         struct buffer_head *bh;
896         struct inode *lqinode = sb_dqopt(sb)->files[dquot->dq_type];
897         int status;
898
899         status = ocfs2_read_quota_phys_block(lqinode, od->dq_local_phys_blk,
900                                              &bh);
901         if (status) {
902                 mlog_errno(status);
903                 goto out;
904         }
905         status = ocfs2_modify_bh(lqinode, bh, olq_set_dquot, od);
906         if (status < 0) {
907                 mlog_errno(status);
908                 goto out;
909         }
910 out:
911         brelse(bh);
912         return status;
913 }
914
915 /* Find free entry in local quota file */
916 static struct ocfs2_quota_chunk *ocfs2_find_free_entry(struct super_block *sb,
917                                                        int type,
918                                                        int *offset)
919 {
920         struct mem_dqinfo *info = sb_dqinfo(sb, type);
921         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
922         struct ocfs2_quota_chunk *chunk;
923         struct ocfs2_local_disk_chunk *dchunk;
924         int found = 0, len;
925
926         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
927                 dchunk = (struct ocfs2_local_disk_chunk *)
928                                                 chunk->qc_headerbh->b_data;
929                 if (le32_to_cpu(dchunk->dqc_free) > 0) {
930                         found = 1;
931                         break;
932                 }
933         }
934         if (!found)
935                 return NULL;
936
937         if (chunk->qc_num < oinfo->dqi_chunks - 1) {
938                 len = ol_chunk_entries(sb);
939         } else {
940                 len = (oinfo->dqi_blocks -
941                        ol_quota_chunk_block(sb, chunk->qc_num) - 1)
942                       * ol_quota_entries_per_block(sb);
943         }
944
945         found = ocfs2_find_next_zero_bit(dchunk->dqc_bitmap, len, 0);
946         /* We failed? */
947         if (found == len) {
948                 mlog(ML_ERROR, "Did not find empty entry in chunk %d with %u"
949                      " entries free (type=%d)\n", chunk->qc_num,
950                      le32_to_cpu(dchunk->dqc_free), type);
951                 return ERR_PTR(-EIO);
952         }
953         *offset = found;
954         return chunk;
955 }
956
957 /* Add new chunk to the local quota file */
958 static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
959                                                         struct super_block *sb,
960                                                         int type,
961                                                         int *offset)
962 {
963         struct mem_dqinfo *info = sb_dqinfo(sb, type);
964         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
965         struct inode *lqinode = sb_dqopt(sb)->files[type];
966         struct ocfs2_quota_chunk *chunk = NULL;
967         struct ocfs2_local_disk_chunk *dchunk;
968         int status;
969         handle_t *handle;
970         struct buffer_head *bh = NULL, *dbh = NULL;
971         u64 p_blkno;
972
973         /* We are protected by dqio_sem so no locking needed */
974         status = ocfs2_extend_no_holes(lqinode, NULL,
975                                        lqinode->i_size + 2 * sb->s_blocksize,
976                                        lqinode->i_size);
977         if (status < 0) {
978                 mlog_errno(status);
979                 goto out;
980         }
981         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
982                                           lqinode->i_size + 2 * sb->s_blocksize);
983         if (status < 0) {
984                 mlog_errno(status);
985                 goto out;
986         }
987
988         chunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
989         if (!chunk) {
990                 status = -ENOMEM;
991                 mlog_errno(status);
992                 goto out;
993         }
994         /* Local quota info and two new blocks we initialize */
995         handle = ocfs2_start_trans(OCFS2_SB(sb),
996                         OCFS2_LOCAL_QINFO_WRITE_CREDITS +
997                         2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
998         if (IS_ERR(handle)) {
999                 status = PTR_ERR(handle);
1000                 mlog_errno(status);
1001                 goto out;
1002         }
1003
1004         /* Initialize chunk header */
1005         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
1006                                              &p_blkno, NULL, NULL);
1007         if (status < 0) {
1008                 mlog_errno(status);
1009                 goto out_trans;
1010         }
1011         bh = sb_getblk(sb, p_blkno);
1012         if (!bh) {
1013                 status = -ENOMEM;
1014                 mlog_errno(status);
1015                 goto out_trans;
1016         }
1017         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
1018         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
1019         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
1020                                          OCFS2_JOURNAL_ACCESS_CREATE);
1021         if (status < 0) {
1022                 mlog_errno(status);
1023                 goto out_trans;
1024         }
1025         lock_buffer(bh);
1026         dchunk->dqc_free = cpu_to_le32(ol_quota_entries_per_block(sb));
1027         memset(dchunk->dqc_bitmap, 0,
1028                sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
1029                OCFS2_QBLK_RESERVED_SPACE);
1030         unlock_buffer(bh);
1031         ocfs2_journal_dirty(handle, bh);
1032
1033         /* Initialize new block with structures */
1034         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks + 1,
1035                                              &p_blkno, NULL, NULL);
1036         if (status < 0) {
1037                 mlog_errno(status);
1038                 goto out_trans;
1039         }
1040         dbh = sb_getblk(sb, p_blkno);
1041         if (!dbh) {
1042                 status = -ENOMEM;
1043                 mlog_errno(status);
1044                 goto out_trans;
1045         }
1046         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), dbh);
1047         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), dbh,
1048                                          OCFS2_JOURNAL_ACCESS_CREATE);
1049         if (status < 0) {
1050                 mlog_errno(status);
1051                 goto out_trans;
1052         }
1053         lock_buffer(dbh);
1054         memset(dbh->b_data, 0, sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE);
1055         unlock_buffer(dbh);
1056         ocfs2_journal_dirty(handle, dbh);
1057
1058         /* Update local quotafile info */
1059         oinfo->dqi_blocks += 2;
1060         oinfo->dqi_chunks++;
1061         status = ocfs2_local_write_info(sb, type);
1062         if (status < 0) {
1063                 mlog_errno(status);
1064                 goto out_trans;
1065         }
1066         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1067         if (status < 0) {
1068                 mlog_errno(status);
1069                 goto out;
1070         }
1071
1072         list_add_tail(&chunk->qc_chunk, &oinfo->dqi_chunk);
1073         chunk->qc_num = list_entry(chunk->qc_chunk.prev,
1074                                    struct ocfs2_quota_chunk,
1075                                    qc_chunk)->qc_num + 1;
1076         chunk->qc_headerbh = bh;
1077         *offset = 0;
1078         return chunk;
1079 out_trans:
1080         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1081 out:
1082         brelse(bh);
1083         brelse(dbh);
1084         kmem_cache_free(ocfs2_qf_chunk_cachep, chunk);
1085         return ERR_PTR(status);
1086 }
1087
1088 /* Find free entry in local quota file */
1089 static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
1090                                                        struct super_block *sb,
1091                                                        int type,
1092                                                        int *offset)
1093 {
1094         struct mem_dqinfo *info = sb_dqinfo(sb, type);
1095         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
1096         struct ocfs2_quota_chunk *chunk;
1097         struct inode *lqinode = sb_dqopt(sb)->files[type];
1098         struct ocfs2_local_disk_chunk *dchunk;
1099         int epb = ol_quota_entries_per_block(sb);
1100         unsigned int chunk_blocks;
1101         struct buffer_head *bh;
1102         u64 p_blkno;
1103         int status;
1104         handle_t *handle;
1105
1106         if (list_empty(&oinfo->dqi_chunk))
1107                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1108         /* Is the last chunk full? */
1109         chunk = list_entry(oinfo->dqi_chunk.prev,
1110                         struct ocfs2_quota_chunk, qc_chunk);
1111         chunk_blocks = oinfo->dqi_blocks -
1112                         ol_quota_chunk_block(sb, chunk->qc_num) - 1;
1113         if (ol_chunk_blocks(sb) == chunk_blocks)
1114                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1115
1116         /* We are protected by dqio_sem so no locking needed */
1117         status = ocfs2_extend_no_holes(lqinode, NULL,
1118                                        lqinode->i_size + sb->s_blocksize,
1119                                        lqinode->i_size);
1120         if (status < 0) {
1121                 mlog_errno(status);
1122                 goto out;
1123         }
1124         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
1125                                           lqinode->i_size + sb->s_blocksize);
1126         if (status < 0) {
1127                 mlog_errno(status);
1128                 goto out;
1129         }
1130
1131         /* Get buffer from the just added block */
1132         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
1133                                              &p_blkno, NULL, NULL);
1134         if (status < 0) {
1135                 mlog_errno(status);
1136                 goto out;
1137         }
1138         bh = sb_getblk(sb, p_blkno);
1139         if (!bh) {
1140                 status = -ENOMEM;
1141                 mlog_errno(status);
1142                 goto out;
1143         }
1144         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
1145
1146         /* Local quota info, chunk header and the new block we initialize */
1147         handle = ocfs2_start_trans(OCFS2_SB(sb),
1148                         OCFS2_LOCAL_QINFO_WRITE_CREDITS +
1149                         2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
1150         if (IS_ERR(handle)) {
1151                 status = PTR_ERR(handle);
1152                 mlog_errno(status);
1153                 goto out;
1154         }
1155         /* Zero created block */
1156         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
1157                                  OCFS2_JOURNAL_ACCESS_CREATE);
1158         if (status < 0) {
1159                 mlog_errno(status);
1160                 goto out_trans;
1161         }
1162         lock_buffer(bh);
1163         memset(bh->b_data, 0, sb->s_blocksize);
1164         unlock_buffer(bh);
1165         ocfs2_journal_dirty(handle, bh);
1166
1167         /* Update chunk header */
1168         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
1169                                          chunk->qc_headerbh,
1170                                  OCFS2_JOURNAL_ACCESS_WRITE);
1171         if (status < 0) {
1172                 mlog_errno(status);
1173                 goto out_trans;
1174         }
1175
1176         dchunk = (struct ocfs2_local_disk_chunk *)chunk->qc_headerbh->b_data;
1177         lock_buffer(chunk->qc_headerbh);
1178         le32_add_cpu(&dchunk->dqc_free, ol_quota_entries_per_block(sb));
1179         unlock_buffer(chunk->qc_headerbh);
1180         ocfs2_journal_dirty(handle, chunk->qc_headerbh);
1181
1182         /* Update file header */
1183         oinfo->dqi_blocks++;
1184         status = ocfs2_local_write_info(sb, type);
1185         if (status < 0) {
1186                 mlog_errno(status);
1187                 goto out_trans;
1188         }
1189
1190         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1191         if (status < 0) {
1192                 mlog_errno(status);
1193                 goto out;
1194         }
1195         *offset = chunk_blocks * epb;
1196         return chunk;
1197 out_trans:
1198         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1199 out:
1200         return ERR_PTR(status);
1201 }
1202
1203 static void olq_alloc_dquot(struct buffer_head *bh, void *private)
1204 {
1205         int *offset = private;
1206         struct ocfs2_local_disk_chunk *dchunk;
1207
1208         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
1209         ocfs2_set_bit(*offset, dchunk->dqc_bitmap);
1210         le32_add_cpu(&dchunk->dqc_free, -1);
1211 }
1212
1213 /* Create dquot in the local file for given id */
1214 int ocfs2_create_local_dquot(struct dquot *dquot)
1215 {
1216         struct super_block *sb = dquot->dq_sb;
1217         int type = dquot->dq_type;
1218         struct inode *lqinode = sb_dqopt(sb)->files[type];
1219         struct ocfs2_quota_chunk *chunk;
1220         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1221         int offset;
1222         int status;
1223         u64 pcount;
1224
1225         down_write(&OCFS2_I(lqinode)->ip_alloc_sem);
1226         chunk = ocfs2_find_free_entry(sb, type, &offset);
1227         if (!chunk) {
1228                 chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
1229                 if (IS_ERR(chunk)) {
1230                         status = PTR_ERR(chunk);
1231                         goto out;
1232                 }
1233         } else if (IS_ERR(chunk)) {
1234                 status = PTR_ERR(chunk);
1235                 goto out;
1236         }
1237         od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
1238         od->dq_chunk = chunk;
1239         status = ocfs2_extent_map_get_blocks(lqinode,
1240                                      ol_dqblk_block(sb, chunk->qc_num, offset),
1241                                      &od->dq_local_phys_blk,
1242                                      &pcount,
1243                                      NULL);
1244
1245         /* Initialize dquot structure on disk */
1246         status = ocfs2_local_write_dquot(dquot);
1247         if (status < 0) {
1248                 mlog_errno(status);
1249                 goto out;
1250         }
1251
1252         /* Mark structure as allocated */
1253         status = ocfs2_modify_bh(lqinode, chunk->qc_headerbh, olq_alloc_dquot,
1254                                  &offset);
1255         if (status < 0) {
1256                 mlog_errno(status);
1257                 goto out;
1258         }
1259 out:
1260         up_write(&OCFS2_I(lqinode)->ip_alloc_sem);
1261         return status;
1262 }
1263
1264 /*
1265  * Release dquot structure from local quota file. ocfs2_release_dquot() has
1266  * already started a transaction and written all changes to global quota file
1267  */
1268 int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot)
1269 {
1270         int status;
1271         int type = dquot->dq_type;
1272         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1273         struct super_block *sb = dquot->dq_sb;
1274         struct ocfs2_local_disk_chunk *dchunk;
1275         int offset;
1276
1277         status = ocfs2_journal_access_dq(handle,
1278                         INODE_CACHE(sb_dqopt(sb)->files[type]),
1279                         od->dq_chunk->qc_headerbh, OCFS2_JOURNAL_ACCESS_WRITE);
1280         if (status < 0) {
1281                 mlog_errno(status);
1282                 goto out;
1283         }
1284         offset = ol_dqblk_chunk_off(sb, od->dq_chunk->qc_num,
1285                                              od->dq_local_off);
1286         dchunk = (struct ocfs2_local_disk_chunk *)
1287                         (od->dq_chunk->qc_headerbh->b_data);
1288         /* Mark structure as freed */
1289         lock_buffer(od->dq_chunk->qc_headerbh);
1290         ocfs2_clear_bit(offset, dchunk->dqc_bitmap);
1291         le32_add_cpu(&dchunk->dqc_free, 1);
1292         unlock_buffer(od->dq_chunk->qc_headerbh);
1293         ocfs2_journal_dirty(handle, od->dq_chunk->qc_headerbh);
1294
1295 out:
1296         /* Clear the read bit so that next time someone uses this
1297          * dquot he reads fresh info from disk and allocates local
1298          * dquot structure */
1299         clear_bit(DQ_READ_B, &dquot->dq_flags);
1300         return status;
1301 }
1302
1303 static const struct quota_format_ops ocfs2_format_ops = {
1304         .check_quota_file       = ocfs2_local_check_quota_file,
1305         .read_file_info         = ocfs2_local_read_info,
1306         .write_file_info        = ocfs2_global_write_info,
1307         .free_file_info         = ocfs2_local_free_info,
1308 };
1309
1310 struct quota_format_type ocfs2_quota_format = {
1311         .qf_fmt_id = QFMT_OCFS2,
1312         .qf_ops = &ocfs2_format_ops,
1313         .qf_owner = THIS_MODULE
1314 };