bitops: rename for_each_bit() to for_each_set_bit()
[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/quota.h>
7 #include <linux/quotaops.h>
8 #include <linux/module.h>
9
10 #define MLOG_MASK_PREFIX ML_QUOTA
11 #include <cluster/masklog.h>
12
13 #include "ocfs2_fs.h"
14 #include "ocfs2.h"
15 #include "inode.h"
16 #include "alloc.h"
17 #include "file.h"
18 #include "buffer_head_io.h"
19 #include "journal.h"
20 #include "sysfile.h"
21 #include "dlmglue.h"
22 #include "quota.h"
23 #include "uptodate.h"
24
25 /* Number of local quota structures per block */
26 static inline unsigned int ol_quota_entries_per_block(struct super_block *sb)
27 {
28         return ((sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) /
29                 sizeof(struct ocfs2_local_disk_dqblk));
30 }
31
32 /* Number of blocks with entries in one chunk */
33 static inline unsigned int ol_chunk_blocks(struct super_block *sb)
34 {
35         return ((sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
36                  OCFS2_QBLK_RESERVED_SPACE) << 3) /
37                ol_quota_entries_per_block(sb);
38 }
39
40 /* Number of entries in a chunk bitmap */
41 static unsigned int ol_chunk_entries(struct super_block *sb)
42 {
43         return ol_chunk_blocks(sb) * ol_quota_entries_per_block(sb);
44 }
45
46 /* Offset of the chunk in quota file */
47 static unsigned int ol_quota_chunk_block(struct super_block *sb, int c)
48 {
49         /* 1 block for local quota file info, 1 block per chunk for chunk info */
50         return 1 + (ol_chunk_blocks(sb) + 1) * c;
51 }
52
53 static unsigned int ol_dqblk_block(struct super_block *sb, int c, int off)
54 {
55         int epb = ol_quota_entries_per_block(sb);
56
57         return ol_quota_chunk_block(sb, c) + 1 + off / epb;
58 }
59
60 static unsigned int ol_dqblk_block_off(struct super_block *sb, int c, int off)
61 {
62         int epb = ol_quota_entries_per_block(sb);
63
64         return (off % epb) * sizeof(struct ocfs2_local_disk_dqblk);
65 }
66
67 /* Offset of the dquot structure in the quota file */
68 static loff_t ol_dqblk_off(struct super_block *sb, int c, int off)
69 {
70         return (ol_dqblk_block(sb, c, off) << sb->s_blocksize_bits) +
71                ol_dqblk_block_off(sb, c, off);
72 }
73
74 /* Compute block number from given offset */
75 static inline unsigned int ol_dqblk_file_block(struct super_block *sb, loff_t off)
76 {
77         return off >> sb->s_blocksize_bits;
78 }
79
80 static inline unsigned int ol_dqblk_block_offset(struct super_block *sb, loff_t off)
81 {
82         return off & ((1 << sb->s_blocksize_bits) - 1);
83 }
84
85 /* Compute offset in the chunk of a structure with the given offset */
86 static int ol_dqblk_chunk_off(struct super_block *sb, int c, loff_t off)
87 {
88         int epb = ol_quota_entries_per_block(sb);
89
90         return ((off >> sb->s_blocksize_bits) -
91                         ol_quota_chunk_block(sb, c) - 1) * epb
92                + ((unsigned int)(off & ((1 << sb->s_blocksize_bits) - 1))) /
93                  sizeof(struct ocfs2_local_disk_dqblk);
94 }
95
96 /* Write bufferhead into the fs */
97 static int ocfs2_modify_bh(struct inode *inode, struct buffer_head *bh,
98                 void (*modify)(struct buffer_head *, void *), void *private)
99 {
100         struct super_block *sb = inode->i_sb;
101         handle_t *handle;
102         int status;
103
104         handle = ocfs2_start_trans(OCFS2_SB(sb),
105                                    OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
106         if (IS_ERR(handle)) {
107                 status = PTR_ERR(handle);
108                 mlog_errno(status);
109                 return status;
110         }
111         status = ocfs2_journal_access_dq(handle, INODE_CACHE(inode), bh,
112                                          OCFS2_JOURNAL_ACCESS_WRITE);
113         if (status < 0) {
114                 mlog_errno(status);
115                 ocfs2_commit_trans(OCFS2_SB(sb), handle);
116                 return status;
117         }
118         lock_buffer(bh);
119         modify(bh, private);
120         unlock_buffer(bh);
121         status = ocfs2_journal_dirty(handle, bh);
122         if (status < 0) {
123                 mlog_errno(status);
124                 ocfs2_commit_trans(OCFS2_SB(sb), handle);
125                 return status;
126         }
127         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
128         if (status < 0) {
129                 mlog_errno(status);
130                 return status;
131         }
132         return 0;
133 }
134
135 /* Check whether we understand format of quota files */
136 static int ocfs2_local_check_quota_file(struct super_block *sb, int type)
137 {
138         unsigned int lmagics[MAXQUOTAS] = OCFS2_LOCAL_QMAGICS;
139         unsigned int lversions[MAXQUOTAS] = OCFS2_LOCAL_QVERSIONS;
140         unsigned int gmagics[MAXQUOTAS] = OCFS2_GLOBAL_QMAGICS;
141         unsigned int gversions[MAXQUOTAS] = OCFS2_GLOBAL_QVERSIONS;
142         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
143                                         GROUP_QUOTA_SYSTEM_INODE };
144         struct buffer_head *bh = NULL;
145         struct inode *linode = sb_dqopt(sb)->files[type];
146         struct inode *ginode = NULL;
147         struct ocfs2_disk_dqheader *dqhead;
148         int status, ret = 0;
149
150         /* First check whether we understand local quota file */
151         status = ocfs2_read_quota_block(linode, 0, &bh);
152         if (status) {
153                 mlog_errno(status);
154                 mlog(ML_ERROR, "failed to read quota file header (type=%d)\n",
155                         type);
156                 goto out_err;
157         }
158         dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
159         if (le32_to_cpu(dqhead->dqh_magic) != lmagics[type]) {
160                 mlog(ML_ERROR, "quota file magic does not match (%u != %u),"
161                         " type=%d\n", le32_to_cpu(dqhead->dqh_magic),
162                         lmagics[type], type);
163                 goto out_err;
164         }
165         if (le32_to_cpu(dqhead->dqh_version) != lversions[type]) {
166                 mlog(ML_ERROR, "quota file version does not match (%u != %u),"
167                         " type=%d\n", le32_to_cpu(dqhead->dqh_version),
168                         lversions[type], type);
169                 goto out_err;
170         }
171         brelse(bh);
172         bh = NULL;
173
174         /* Next check whether we understand global quota file */
175         ginode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
176                                                 OCFS2_INVALID_SLOT);
177         if (!ginode) {
178                 mlog(ML_ERROR, "cannot get global quota file inode "
179                                 "(type=%d)\n", type);
180                 goto out_err;
181         }
182         /* Since the header is read only, we don't care about locking */
183         status = ocfs2_read_quota_block(ginode, 0, &bh);
184         if (status) {
185                 mlog_errno(status);
186                 mlog(ML_ERROR, "failed to read global quota file header "
187                                 "(type=%d)\n", type);
188                 goto out_err;
189         }
190         dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
191         if (le32_to_cpu(dqhead->dqh_magic) != gmagics[type]) {
192                 mlog(ML_ERROR, "global quota file magic does not match "
193                         "(%u != %u), type=%d\n",
194                         le32_to_cpu(dqhead->dqh_magic), gmagics[type], type);
195                 goto out_err;
196         }
197         if (le32_to_cpu(dqhead->dqh_version) != gversions[type]) {
198                 mlog(ML_ERROR, "global quota file version does not match "
199                         "(%u != %u), type=%d\n",
200                         le32_to_cpu(dqhead->dqh_version), gversions[type],
201                         type);
202                 goto out_err;
203         }
204
205         ret = 1;
206 out_err:
207         brelse(bh);
208         iput(ginode);
209         return ret;
210 }
211
212 /* Release given list of quota file chunks */
213 static void ocfs2_release_local_quota_bitmaps(struct list_head *head)
214 {
215         struct ocfs2_quota_chunk *pos, *next;
216
217         list_for_each_entry_safe(pos, next, head, qc_chunk) {
218                 list_del(&pos->qc_chunk);
219                 brelse(pos->qc_headerbh);
220                 kmem_cache_free(ocfs2_qf_chunk_cachep, pos);
221         }
222 }
223
224 /* Load quota bitmaps into memory */
225 static int ocfs2_load_local_quota_bitmaps(struct inode *inode,
226                         struct ocfs2_local_disk_dqinfo *ldinfo,
227                         struct list_head *head)
228 {
229         struct ocfs2_quota_chunk *newchunk;
230         int i, status;
231
232         INIT_LIST_HEAD(head);
233         for (i = 0; i < le32_to_cpu(ldinfo->dqi_chunks); i++) {
234                 newchunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
235                 if (!newchunk) {
236                         ocfs2_release_local_quota_bitmaps(head);
237                         return -ENOMEM;
238                 }
239                 newchunk->qc_num = i;
240                 newchunk->qc_headerbh = NULL;
241                 status = ocfs2_read_quota_block(inode,
242                                 ol_quota_chunk_block(inode->i_sb, i),
243                                 &newchunk->qc_headerbh);
244                 if (status) {
245                         mlog_errno(status);
246                         kmem_cache_free(ocfs2_qf_chunk_cachep, newchunk);
247                         ocfs2_release_local_quota_bitmaps(head);
248                         return status;
249                 }
250                 list_add_tail(&newchunk->qc_chunk, head);
251         }
252         return 0;
253 }
254
255 static void olq_update_info(struct buffer_head *bh, void *private)
256 {
257         struct mem_dqinfo *info = private;
258         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
259         struct ocfs2_local_disk_dqinfo *ldinfo;
260
261         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
262                                                 OCFS2_LOCAL_INFO_OFF);
263         spin_lock(&dq_data_lock);
264         ldinfo->dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
265         ldinfo->dqi_chunks = cpu_to_le32(oinfo->dqi_chunks);
266         ldinfo->dqi_blocks = cpu_to_le32(oinfo->dqi_blocks);
267         spin_unlock(&dq_data_lock);
268 }
269
270 static int ocfs2_add_recovery_chunk(struct super_block *sb,
271                                     struct ocfs2_local_disk_chunk *dchunk,
272                                     int chunk,
273                                     struct list_head *head)
274 {
275         struct ocfs2_recovery_chunk *rc;
276
277         rc = kmalloc(sizeof(struct ocfs2_recovery_chunk), GFP_NOFS);
278         if (!rc)
279                 return -ENOMEM;
280         rc->rc_chunk = chunk;
281         rc->rc_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
282         if (!rc->rc_bitmap) {
283                 kfree(rc);
284                 return -ENOMEM;
285         }
286         memcpy(rc->rc_bitmap, dchunk->dqc_bitmap,
287                (ol_chunk_entries(sb) + 7) >> 3);
288         list_add_tail(&rc->rc_list, head);
289         return 0;
290 }
291
292 static void free_recovery_list(struct list_head *head)
293 {
294         struct ocfs2_recovery_chunk *next;
295         struct ocfs2_recovery_chunk *rchunk;
296
297         list_for_each_entry_safe(rchunk, next, head, rc_list) {
298                 list_del(&rchunk->rc_list);
299                 kfree(rchunk->rc_bitmap);
300                 kfree(rchunk);
301         }
302 }
303
304 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec)
305 {
306         int type;
307
308         for (type = 0; type < MAXQUOTAS; type++)
309                 free_recovery_list(&(rec->r_list[type]));
310         kfree(rec);
311 }
312
313 /* Load entries in our quota file we have to recover*/
314 static int ocfs2_recovery_load_quota(struct inode *lqinode,
315                                      struct ocfs2_local_disk_dqinfo *ldinfo,
316                                      int type,
317                                      struct list_head *head)
318 {
319         struct super_block *sb = lqinode->i_sb;
320         struct buffer_head *hbh;
321         struct ocfs2_local_disk_chunk *dchunk;
322         int i, chunks = le32_to_cpu(ldinfo->dqi_chunks);
323         int status = 0;
324
325         for (i = 0; i < chunks; i++) {
326                 hbh = NULL;
327                 status = ocfs2_read_quota_block(lqinode,
328                                                 ol_quota_chunk_block(sb, i),
329                                                 &hbh);
330                 if (status) {
331                         mlog_errno(status);
332                         break;
333                 }
334                 dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
335                 if (le32_to_cpu(dchunk->dqc_free) < ol_chunk_entries(sb))
336                         status = ocfs2_add_recovery_chunk(sb, dchunk, i, head);
337                 brelse(hbh);
338                 if (status < 0)
339                         break;
340         }
341         if (status < 0)
342                 free_recovery_list(head);
343         return status;
344 }
345
346 static struct ocfs2_quota_recovery *ocfs2_alloc_quota_recovery(void)
347 {
348         int type;
349         struct ocfs2_quota_recovery *rec;
350
351         rec = kmalloc(sizeof(struct ocfs2_quota_recovery), GFP_NOFS);
352         if (!rec)
353                 return NULL;
354         for (type = 0; type < MAXQUOTAS; type++)
355                 INIT_LIST_HEAD(&(rec->r_list[type]));
356         return rec;
357 }
358
359 /* Load information we need for quota recovery into memory */
360 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
361                                                 struct ocfs2_super *osb,
362                                                 int slot_num)
363 {
364         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
365                                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
366         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
367                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
368         struct super_block *sb = osb->sb;
369         struct ocfs2_local_disk_dqinfo *ldinfo;
370         struct inode *lqinode;
371         struct buffer_head *bh;
372         int type;
373         int status = 0;
374         struct ocfs2_quota_recovery *rec;
375
376         mlog(ML_NOTICE, "Beginning quota recovery in slot %u\n", slot_num);
377         rec = ocfs2_alloc_quota_recovery();
378         if (!rec)
379                 return ERR_PTR(-ENOMEM);
380         /* First init... */
381
382         for (type = 0; type < MAXQUOTAS; type++) {
383                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
384                         continue;
385                 /* At this point, journal of the slot is already replayed so
386                  * we can trust metadata and data of the quota file */
387                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
388                 if (!lqinode) {
389                         status = -ENOENT;
390                         goto out;
391                 }
392                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
393                                                OCFS2_META_LOCK_RECOVERY);
394                 if (status < 0) {
395                         mlog_errno(status);
396                         goto out_put;
397                 }
398                 /* Now read local header */
399                 bh = NULL;
400                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
401                 if (status) {
402                         mlog_errno(status);
403                         mlog(ML_ERROR, "failed to read quota file info header "
404                                 "(slot=%d type=%d)\n", slot_num, type);
405                         goto out_lock;
406                 }
407                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
408                                                         OCFS2_LOCAL_INFO_OFF);
409                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
410                                                    &rec->r_list[type]);
411                 brelse(bh);
412 out_lock:
413                 ocfs2_inode_unlock(lqinode, 1);
414 out_put:
415                 iput(lqinode);
416                 if (status < 0)
417                         break;
418         }
419 out:
420         if (status < 0) {
421                 ocfs2_free_quota_recovery(rec);
422                 rec = ERR_PTR(status);
423         }
424         return rec;
425 }
426
427 /* Sync changes in local quota file into global quota file and
428  * reinitialize local quota file.
429  * The function expects local quota file to be already locked and
430  * dqonoff_mutex locked. */
431 static int ocfs2_recover_local_quota_file(struct inode *lqinode,
432                                           int type,
433                                           struct ocfs2_quota_recovery *rec)
434 {
435         struct super_block *sb = lqinode->i_sb;
436         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
437         struct ocfs2_local_disk_chunk *dchunk;
438         struct ocfs2_local_disk_dqblk *dqblk;
439         struct dquot *dquot;
440         handle_t *handle;
441         struct buffer_head *hbh = NULL, *qbh = NULL;
442         int status = 0;
443         int bit, chunk;
444         struct ocfs2_recovery_chunk *rchunk, *next;
445         qsize_t spacechange, inodechange;
446
447         mlog_entry("ino=%lu type=%u", (unsigned long)lqinode->i_ino, type);
448
449         list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
450                 chunk = rchunk->rc_chunk;
451                 hbh = NULL;
452                 status = ocfs2_read_quota_block(lqinode,
453                                                 ol_quota_chunk_block(sb, chunk),
454                                                 &hbh);
455                 if (status) {
456                         mlog_errno(status);
457                         break;
458                 }
459                 dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
460                 for_each_set_bit(bit, rchunk->rc_bitmap, ol_chunk_entries(sb)) {
461                         qbh = NULL;
462                         status = ocfs2_read_quota_block(lqinode,
463                                                 ol_dqblk_block(sb, chunk, bit),
464                                                 &qbh);
465                         if (status) {
466                                 mlog_errno(status);
467                                 break;
468                         }
469                         dqblk = (struct ocfs2_local_disk_dqblk *)(qbh->b_data +
470                                 ol_dqblk_block_off(sb, chunk, bit));
471                         dquot = dqget(sb, le64_to_cpu(dqblk->dqb_id), type);
472                         if (!dquot) {
473                                 status = -EIO;
474                                 mlog(ML_ERROR, "Failed to get quota structure "
475                                      "for id %u, type %d. Cannot finish quota "
476                                      "file recovery.\n",
477                                      (unsigned)le64_to_cpu(dqblk->dqb_id),
478                                      type);
479                                 goto out_put_bh;
480                         }
481                         status = ocfs2_lock_global_qf(oinfo, 1);
482                         if (status < 0) {
483                                 mlog_errno(status);
484                                 goto out_put_dquot;
485                         }
486
487                         handle = ocfs2_start_trans(OCFS2_SB(sb),
488                                                    OCFS2_QSYNC_CREDITS);
489                         if (IS_ERR(handle)) {
490                                 status = PTR_ERR(handle);
491                                 mlog_errno(status);
492                                 goto out_drop_lock;
493                         }
494                         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
495                         spin_lock(&dq_data_lock);
496                         /* Add usage from quota entry into quota changes
497                          * of our node. Auxiliary variables are important
498                          * due to signedness */
499                         spacechange = le64_to_cpu(dqblk->dqb_spacemod);
500                         inodechange = le64_to_cpu(dqblk->dqb_inodemod);
501                         dquot->dq_dqb.dqb_curspace += spacechange;
502                         dquot->dq_dqb.dqb_curinodes += inodechange;
503                         spin_unlock(&dq_data_lock);
504                         /* We want to drop reference held by the crashed
505                          * node. Since we have our own reference we know
506                          * global structure actually won't be freed. */
507                         status = ocfs2_global_release_dquot(dquot);
508                         if (status < 0) {
509                                 mlog_errno(status);
510                                 goto out_commit;
511                         }
512                         /* Release local quota file entry */
513                         status = ocfs2_journal_access_dq(handle,
514                                         INODE_CACHE(lqinode),
515                                         qbh, OCFS2_JOURNAL_ACCESS_WRITE);
516                         if (status < 0) {
517                                 mlog_errno(status);
518                                 goto out_commit;
519                         }
520                         lock_buffer(qbh);
521                         WARN_ON(!ocfs2_test_bit(bit, dchunk->dqc_bitmap));
522                         ocfs2_clear_bit(bit, dchunk->dqc_bitmap);
523                         le32_add_cpu(&dchunk->dqc_free, 1);
524                         unlock_buffer(qbh);
525                         status = ocfs2_journal_dirty(handle, qbh);
526                         if (status < 0)
527                                 mlog_errno(status);
528 out_commit:
529                         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
530                         ocfs2_commit_trans(OCFS2_SB(sb), handle);
531 out_drop_lock:
532                         ocfs2_unlock_global_qf(oinfo, 1);
533 out_put_dquot:
534                         dqput(dquot);
535 out_put_bh:
536                         brelse(qbh);
537                         if (status < 0)
538                                 break;
539                 }
540                 brelse(hbh);
541                 list_del(&rchunk->rc_list);
542                 kfree(rchunk->rc_bitmap);
543                 kfree(rchunk);
544                 if (status < 0)
545                         break;
546         }
547         if (status < 0)
548                 free_recovery_list(&(rec->r_list[type]));
549         mlog_exit(status);
550         return status;
551 }
552
553 /* Recover local quota files for given node different from us */
554 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
555                                 struct ocfs2_quota_recovery *rec,
556                                 int slot_num)
557 {
558         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
559                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
560         struct super_block *sb = osb->sb;
561         struct ocfs2_local_disk_dqinfo *ldinfo;
562         struct buffer_head *bh;
563         handle_t *handle;
564         int type;
565         int status = 0;
566         struct inode *lqinode;
567         unsigned int flags;
568
569         mlog(ML_NOTICE, "Finishing quota recovery in slot %u\n", slot_num);
570         mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
571         for (type = 0; type < MAXQUOTAS; type++) {
572                 if (list_empty(&(rec->r_list[type])))
573                         continue;
574                 mlog(0, "Recovering quota in slot %d\n", slot_num);
575                 lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
576                 if (!lqinode) {
577                         status = -ENOENT;
578                         goto out;
579                 }
580                 status = ocfs2_inode_lock_full(lqinode, NULL, 1,
581                                                        OCFS2_META_LOCK_NOQUEUE);
582                 /* Someone else is holding the lock? Then he must be
583                  * doing the recovery. Just skip the file... */
584                 if (status == -EAGAIN) {
585                         mlog(ML_NOTICE, "skipping quota recovery for slot %d "
586                              "because quota file is locked.\n", slot_num);
587                         status = 0;
588                         goto out_put;
589                 } else if (status < 0) {
590                         mlog_errno(status);
591                         goto out_put;
592                 }
593                 /* Now read local header */
594                 bh = NULL;
595                 status = ocfs2_read_quota_block(lqinode, 0, &bh);
596                 if (status) {
597                         mlog_errno(status);
598                         mlog(ML_ERROR, "failed to read quota file info header "
599                                 "(slot=%d type=%d)\n", slot_num, type);
600                         goto out_lock;
601                 }
602                 ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
603                                                         OCFS2_LOCAL_INFO_OFF);
604                 /* Is recovery still needed? */
605                 flags = le32_to_cpu(ldinfo->dqi_flags);
606                 if (!(flags & OLQF_CLEAN))
607                         status = ocfs2_recover_local_quota_file(lqinode,
608                                                                 type,
609                                                                 rec);
610                 /* We don't want to mark file as clean when it is actually
611                  * active */
612                 if (slot_num == osb->slot_num)
613                         goto out_bh;
614                 /* Mark quota file as clean if we are recovering quota file of
615                  * some other node. */
616                 handle = ocfs2_start_trans(osb,
617                                            OCFS2_LOCAL_QINFO_WRITE_CREDITS);
618                 if (IS_ERR(handle)) {
619                         status = PTR_ERR(handle);
620                         mlog_errno(status);
621                         goto out_bh;
622                 }
623                 status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
624                                                  bh,
625                                                  OCFS2_JOURNAL_ACCESS_WRITE);
626                 if (status < 0) {
627                         mlog_errno(status);
628                         goto out_trans;
629                 }
630                 lock_buffer(bh);
631                 ldinfo->dqi_flags = cpu_to_le32(flags | OLQF_CLEAN);
632                 unlock_buffer(bh);
633                 status = ocfs2_journal_dirty(handle, bh);
634                 if (status < 0)
635                         mlog_errno(status);
636 out_trans:
637                 ocfs2_commit_trans(osb, handle);
638 out_bh:
639                 brelse(bh);
640 out_lock:
641                 ocfs2_inode_unlock(lqinode, 1);
642 out_put:
643                 iput(lqinode);
644                 if (status < 0)
645                         break;
646         }
647 out:
648         mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
649         kfree(rec);
650         return status;
651 }
652
653 /* Read information header from quota file */
654 static int ocfs2_local_read_info(struct super_block *sb, int type)
655 {
656         struct ocfs2_local_disk_dqinfo *ldinfo;
657         struct mem_dqinfo *info = sb_dqinfo(sb, type);
658         struct ocfs2_mem_dqinfo *oinfo;
659         struct inode *lqinode = sb_dqopt(sb)->files[type];
660         int status;
661         struct buffer_head *bh = NULL;
662         struct ocfs2_quota_recovery *rec;
663         int locked = 0;
664
665         /* We don't need the lock and we have to acquire quota file locks
666          * which will later depend on this lock */
667         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
668         info->dqi_maxblimit = 0x7fffffffffffffffLL;
669         info->dqi_maxilimit = 0x7fffffffffffffffLL;
670         oinfo = kmalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
671         if (!oinfo) {
672                 mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
673                                " info.");
674                 goto out_err;
675         }
676         info->dqi_priv = oinfo;
677         oinfo->dqi_type = type;
678         INIT_LIST_HEAD(&oinfo->dqi_chunk);
679         oinfo->dqi_rec = NULL;
680         oinfo->dqi_lqi_bh = NULL;
681         oinfo->dqi_ibh = NULL;
682
683         status = ocfs2_global_read_info(sb, type);
684         if (status < 0)
685                 goto out_err;
686
687         status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
688         if (status < 0) {
689                 mlog_errno(status);
690                 goto out_err;
691         }
692         locked = 1;
693
694         /* Now read local header */
695         status = ocfs2_read_quota_block(lqinode, 0, &bh);
696         if (status) {
697                 mlog_errno(status);
698                 mlog(ML_ERROR, "failed to read quota file info header "
699                         "(type=%d)\n", type);
700                 goto out_err;
701         }
702         ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
703                                                 OCFS2_LOCAL_INFO_OFF);
704         info->dqi_flags = le32_to_cpu(ldinfo->dqi_flags);
705         oinfo->dqi_chunks = le32_to_cpu(ldinfo->dqi_chunks);
706         oinfo->dqi_blocks = le32_to_cpu(ldinfo->dqi_blocks);
707         oinfo->dqi_ibh = bh;
708
709         /* We crashed when using local quota file? */
710         if (!(info->dqi_flags & OLQF_CLEAN)) {
711                 rec = OCFS2_SB(sb)->quota_rec;
712                 if (!rec) {
713                         rec = ocfs2_alloc_quota_recovery();
714                         if (!rec) {
715                                 status = -ENOMEM;
716                                 mlog_errno(status);
717                                 goto out_err;
718                         }
719                         OCFS2_SB(sb)->quota_rec = rec;
720                 }
721
722                 status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
723                                                    &rec->r_list[type]);
724                 if (status < 0) {
725                         mlog_errno(status);
726                         goto out_err;
727                 }
728         }
729
730         status = ocfs2_load_local_quota_bitmaps(lqinode,
731                                                 ldinfo,
732                                                 &oinfo->dqi_chunk);
733         if (status < 0) {
734                 mlog_errno(status);
735                 goto out_err;
736         }
737
738         /* Now mark quota file as used */
739         info->dqi_flags &= ~OLQF_CLEAN;
740         status = ocfs2_modify_bh(lqinode, bh, olq_update_info, info);
741         if (status < 0) {
742                 mlog_errno(status);
743                 goto out_err;
744         }
745
746         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
747         return 0;
748 out_err:
749         if (oinfo) {
750                 iput(oinfo->dqi_gqinode);
751                 ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
752                 ocfs2_lock_res_free(&oinfo->dqi_gqlock);
753                 brelse(oinfo->dqi_lqi_bh);
754                 if (locked)
755                         ocfs2_inode_unlock(lqinode, 1);
756                 ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
757                 kfree(oinfo);
758         }
759         brelse(bh);
760         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
761         return -1;
762 }
763
764 /* Write local info to quota file */
765 static int ocfs2_local_write_info(struct super_block *sb, int type)
766 {
767         struct mem_dqinfo *info = sb_dqinfo(sb, type);
768         struct buffer_head *bh = ((struct ocfs2_mem_dqinfo *)info->dqi_priv)
769                                                 ->dqi_ibh;
770         int status;
771
772         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type], bh, olq_update_info,
773                                  info);
774         if (status < 0) {
775                 mlog_errno(status);
776                 return -1;
777         }
778
779         return 0;
780 }
781
782 /* Release info from memory */
783 static int ocfs2_local_free_info(struct super_block *sb, int type)
784 {
785         struct mem_dqinfo *info = sb_dqinfo(sb, type);
786         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
787         struct ocfs2_quota_chunk *chunk;
788         struct ocfs2_local_disk_chunk *dchunk;
789         int mark_clean = 1, len;
790         int status;
791
792         /* At this point we know there are no more dquots and thus
793          * even if there's some sync in the pdflush queue, it won't
794          * find any dquots and return without doing anything */
795         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
796         iput(oinfo->dqi_gqinode);
797         ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
798         ocfs2_lock_res_free(&oinfo->dqi_gqlock);
799         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
800                 dchunk = (struct ocfs2_local_disk_chunk *)
801                                         (chunk->qc_headerbh->b_data);
802                 if (chunk->qc_num < oinfo->dqi_chunks - 1) {
803                         len = ol_chunk_entries(sb);
804                 } else {
805                         len = (oinfo->dqi_blocks -
806                                ol_quota_chunk_block(sb, chunk->qc_num) - 1)
807                               * ol_quota_entries_per_block(sb);
808                 }
809                 /* Not all entries free? Bug! */
810                 if (le32_to_cpu(dchunk->dqc_free) != len) {
811                         mlog(ML_ERROR, "releasing quota file with used "
812                                         "entries (type=%d)\n", type);
813                         mark_clean = 0;
814                 }
815         }
816         ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
817
818         /* dqonoff_mutex protects us against racing with recovery thread... */
819         if (oinfo->dqi_rec) {
820                 ocfs2_free_quota_recovery(oinfo->dqi_rec);
821                 mark_clean = 0;
822         }
823
824         if (!mark_clean)
825                 goto out;
826
827         /* Mark local file as clean */
828         info->dqi_flags |= OLQF_CLEAN;
829         status = ocfs2_modify_bh(sb_dqopt(sb)->files[type],
830                                  oinfo->dqi_ibh,
831                                  olq_update_info,
832                                  info);
833         if (status < 0) {
834                 mlog_errno(status);
835                 goto out;
836         }
837
838 out:
839         ocfs2_inode_unlock(sb_dqopt(sb)->files[type], 1);
840         brelse(oinfo->dqi_ibh);
841         brelse(oinfo->dqi_lqi_bh);
842         kfree(oinfo);
843         return 0;
844 }
845
846 static void olq_set_dquot(struct buffer_head *bh, void *private)
847 {
848         struct ocfs2_dquot *od = private;
849         struct ocfs2_local_disk_dqblk *dqblk;
850         struct super_block *sb = od->dq_dquot.dq_sb;
851
852         dqblk = (struct ocfs2_local_disk_dqblk *)(bh->b_data
853                 + ol_dqblk_block_offset(sb, od->dq_local_off));
854
855         dqblk->dqb_id = cpu_to_le64(od->dq_dquot.dq_id);
856         spin_lock(&dq_data_lock);
857         dqblk->dqb_spacemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curspace -
858                                           od->dq_origspace);
859         dqblk->dqb_inodemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curinodes -
860                                           od->dq_originodes);
861         spin_unlock(&dq_data_lock);
862         mlog(0, "Writing local dquot %u space %lld inodes %lld\n",
863              od->dq_dquot.dq_id, (long long)le64_to_cpu(dqblk->dqb_spacemod),
864              (long long)le64_to_cpu(dqblk->dqb_inodemod));
865 }
866
867 /* Write dquot to local quota file */
868 static int ocfs2_local_write_dquot(struct dquot *dquot)
869 {
870         struct super_block *sb = dquot->dq_sb;
871         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
872         struct buffer_head *bh = NULL;
873         int status;
874
875         status = ocfs2_read_quota_block(sb_dqopt(sb)->files[dquot->dq_type],
876                                     ol_dqblk_file_block(sb, od->dq_local_off),
877                                     &bh);
878         if (status) {
879                 mlog_errno(status);
880                 goto out;
881         }
882         status = ocfs2_modify_bh(sb_dqopt(sb)->files[dquot->dq_type], bh,
883                                  olq_set_dquot, od);
884         if (status < 0) {
885                 mlog_errno(status);
886                 goto out;
887         }
888 out:
889         brelse(bh);
890         return status;
891 }
892
893 /* Find free entry in local quota file */
894 static struct ocfs2_quota_chunk *ocfs2_find_free_entry(struct super_block *sb,
895                                                        int type,
896                                                        int *offset)
897 {
898         struct mem_dqinfo *info = sb_dqinfo(sb, type);
899         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
900         struct ocfs2_quota_chunk *chunk;
901         struct ocfs2_local_disk_chunk *dchunk;
902         int found = 0, len;
903
904         list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
905                 dchunk = (struct ocfs2_local_disk_chunk *)
906                                                 chunk->qc_headerbh->b_data;
907                 if (le32_to_cpu(dchunk->dqc_free) > 0) {
908                         found = 1;
909                         break;
910                 }
911         }
912         if (!found)
913                 return NULL;
914
915         if (chunk->qc_num < oinfo->dqi_chunks - 1) {
916                 len = ol_chunk_entries(sb);
917         } else {
918                 len = (oinfo->dqi_blocks -
919                        ol_quota_chunk_block(sb, chunk->qc_num) - 1)
920                       * ol_quota_entries_per_block(sb);
921         }
922
923         found = ocfs2_find_next_zero_bit(dchunk->dqc_bitmap, len, 0);
924         /* We failed? */
925         if (found == len) {
926                 mlog(ML_ERROR, "Did not find empty entry in chunk %d with %u"
927                      " entries free (type=%d)\n", chunk->qc_num,
928                      le32_to_cpu(dchunk->dqc_free), type);
929                 return ERR_PTR(-EIO);
930         }
931         *offset = found;
932         return chunk;
933 }
934
935 /* Add new chunk to the local quota file */
936 static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
937                                                         struct super_block *sb,
938                                                         int type,
939                                                         int *offset)
940 {
941         struct mem_dqinfo *info = sb_dqinfo(sb, type);
942         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
943         struct inode *lqinode = sb_dqopt(sb)->files[type];
944         struct ocfs2_quota_chunk *chunk = NULL;
945         struct ocfs2_local_disk_chunk *dchunk;
946         int status;
947         handle_t *handle;
948         struct buffer_head *bh = NULL, *dbh = NULL;
949         u64 p_blkno;
950
951         /* We are protected by dqio_sem so no locking needed */
952         status = ocfs2_extend_no_holes(lqinode,
953                                        lqinode->i_size + 2 * sb->s_blocksize,
954                                        lqinode->i_size);
955         if (status < 0) {
956                 mlog_errno(status);
957                 goto out;
958         }
959         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
960                                           lqinode->i_size + 2 * sb->s_blocksize);
961         if (status < 0) {
962                 mlog_errno(status);
963                 goto out;
964         }
965
966         chunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
967         if (!chunk) {
968                 status = -ENOMEM;
969                 mlog_errno(status);
970                 goto out;
971         }
972         /* Local quota info and two new blocks we initialize */
973         handle = ocfs2_start_trans(OCFS2_SB(sb),
974                         OCFS2_LOCAL_QINFO_WRITE_CREDITS +
975                         2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
976         if (IS_ERR(handle)) {
977                 status = PTR_ERR(handle);
978                 mlog_errno(status);
979                 goto out;
980         }
981
982         /* Initialize chunk header */
983         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
984         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
985                                              &p_blkno, NULL, NULL);
986         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
987         if (status < 0) {
988                 mlog_errno(status);
989                 goto out_trans;
990         }
991         bh = sb_getblk(sb, p_blkno);
992         if (!bh) {
993                 status = -ENOMEM;
994                 mlog_errno(status);
995                 goto out_trans;
996         }
997         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
998         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
999         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
1000                                          OCFS2_JOURNAL_ACCESS_CREATE);
1001         if (status < 0) {
1002                 mlog_errno(status);
1003                 goto out_trans;
1004         }
1005         lock_buffer(bh);
1006         dchunk->dqc_free = cpu_to_le32(ol_quota_entries_per_block(sb));
1007         memset(dchunk->dqc_bitmap, 0,
1008                sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
1009                OCFS2_QBLK_RESERVED_SPACE);
1010         unlock_buffer(bh);
1011         status = ocfs2_journal_dirty(handle, bh);
1012         if (status < 0) {
1013                 mlog_errno(status);
1014                 goto out_trans;
1015         }
1016
1017         /* Initialize new block with structures */
1018         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1019         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks + 1,
1020                                              &p_blkno, NULL, NULL);
1021         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1022         if (status < 0) {
1023                 mlog_errno(status);
1024                 goto out_trans;
1025         }
1026         dbh = sb_getblk(sb, p_blkno);
1027         if (!dbh) {
1028                 status = -ENOMEM;
1029                 mlog_errno(status);
1030                 goto out_trans;
1031         }
1032         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), dbh);
1033         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), dbh,
1034                                          OCFS2_JOURNAL_ACCESS_CREATE);
1035         if (status < 0) {
1036                 mlog_errno(status);
1037                 goto out_trans;
1038         }
1039         lock_buffer(dbh);
1040         memset(dbh->b_data, 0, sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE);
1041         unlock_buffer(dbh);
1042         status = ocfs2_journal_dirty(handle, dbh);
1043         if (status < 0) {
1044                 mlog_errno(status);
1045                 goto out_trans;
1046         }
1047
1048         /* Update local quotafile info */
1049         oinfo->dqi_blocks += 2;
1050         oinfo->dqi_chunks++;
1051         status = ocfs2_local_write_info(sb, type);
1052         if (status < 0) {
1053                 mlog_errno(status);
1054                 goto out_trans;
1055         }
1056         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1057         if (status < 0) {
1058                 mlog_errno(status);
1059                 goto out;
1060         }
1061
1062         list_add_tail(&chunk->qc_chunk, &oinfo->dqi_chunk);
1063         chunk->qc_num = list_entry(chunk->qc_chunk.prev,
1064                                    struct ocfs2_quota_chunk,
1065                                    qc_chunk)->qc_num + 1;
1066         chunk->qc_headerbh = bh;
1067         *offset = 0;
1068         return chunk;
1069 out_trans:
1070         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1071 out:
1072         brelse(bh);
1073         brelse(dbh);
1074         kmem_cache_free(ocfs2_qf_chunk_cachep, chunk);
1075         return ERR_PTR(status);
1076 }
1077
1078 /* Find free entry in local quota file */
1079 static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
1080                                                        struct super_block *sb,
1081                                                        int type,
1082                                                        int *offset)
1083 {
1084         struct mem_dqinfo *info = sb_dqinfo(sb, type);
1085         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
1086         struct ocfs2_quota_chunk *chunk;
1087         struct inode *lqinode = sb_dqopt(sb)->files[type];
1088         struct ocfs2_local_disk_chunk *dchunk;
1089         int epb = ol_quota_entries_per_block(sb);
1090         unsigned int chunk_blocks;
1091         struct buffer_head *bh;
1092         u64 p_blkno;
1093         int status;
1094         handle_t *handle;
1095
1096         if (list_empty(&oinfo->dqi_chunk))
1097                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1098         /* Is the last chunk full? */
1099         chunk = list_entry(oinfo->dqi_chunk.prev,
1100                         struct ocfs2_quota_chunk, qc_chunk);
1101         chunk_blocks = oinfo->dqi_blocks -
1102                         ol_quota_chunk_block(sb, chunk->qc_num) - 1;
1103         if (ol_chunk_blocks(sb) == chunk_blocks)
1104                 return ocfs2_local_quota_add_chunk(sb, type, offset);
1105
1106         /* We are protected by dqio_sem so no locking needed */
1107         status = ocfs2_extend_no_holes(lqinode,
1108                                        lqinode->i_size + sb->s_blocksize,
1109                                        lqinode->i_size);
1110         if (status < 0) {
1111                 mlog_errno(status);
1112                 goto out;
1113         }
1114         status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
1115                                           lqinode->i_size + sb->s_blocksize);
1116         if (status < 0) {
1117                 mlog_errno(status);
1118                 goto out;
1119         }
1120
1121         /* Get buffer from the just added block */
1122         down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1123         status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
1124                                              &p_blkno, NULL, NULL);
1125         up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1126         if (status < 0) {
1127                 mlog_errno(status);
1128                 goto out;
1129         }
1130         bh = sb_getblk(sb, p_blkno);
1131         if (!bh) {
1132                 status = -ENOMEM;
1133                 mlog_errno(status);
1134                 goto out;
1135         }
1136         ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
1137
1138         /* Local quota info, chunk header and the new block we initialize */
1139         handle = ocfs2_start_trans(OCFS2_SB(sb),
1140                         OCFS2_LOCAL_QINFO_WRITE_CREDITS +
1141                         2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
1142         if (IS_ERR(handle)) {
1143                 status = PTR_ERR(handle);
1144                 mlog_errno(status);
1145                 goto out;
1146         }
1147         /* Zero created block */
1148         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
1149                                  OCFS2_JOURNAL_ACCESS_CREATE);
1150         if (status < 0) {
1151                 mlog_errno(status);
1152                 goto out_trans;
1153         }
1154         lock_buffer(bh);
1155         memset(bh->b_data, 0, sb->s_blocksize);
1156         unlock_buffer(bh);
1157         status = ocfs2_journal_dirty(handle, bh);
1158         if (status < 0) {
1159                 mlog_errno(status);
1160                 goto out_trans;
1161         }
1162         /* Update chunk header */
1163         status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
1164                                          chunk->qc_headerbh,
1165                                  OCFS2_JOURNAL_ACCESS_WRITE);
1166         if (status < 0) {
1167                 mlog_errno(status);
1168                 goto out_trans;
1169         }
1170
1171         dchunk = (struct ocfs2_local_disk_chunk *)chunk->qc_headerbh->b_data;
1172         lock_buffer(chunk->qc_headerbh);
1173         le32_add_cpu(&dchunk->dqc_free, ol_quota_entries_per_block(sb));
1174         unlock_buffer(chunk->qc_headerbh);
1175         status = ocfs2_journal_dirty(handle, chunk->qc_headerbh);
1176         if (status < 0) {
1177                 mlog_errno(status);
1178                 goto out_trans;
1179         }
1180         /* Update file header */
1181         oinfo->dqi_blocks++;
1182         status = ocfs2_local_write_info(sb, type);
1183         if (status < 0) {
1184                 mlog_errno(status);
1185                 goto out_trans;
1186         }
1187
1188         status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1189         if (status < 0) {
1190                 mlog_errno(status);
1191                 goto out;
1192         }
1193         *offset = chunk_blocks * epb;
1194         return chunk;
1195 out_trans:
1196         ocfs2_commit_trans(OCFS2_SB(sb), handle);
1197 out:
1198         return ERR_PTR(status);
1199 }
1200
1201 static void olq_alloc_dquot(struct buffer_head *bh, void *private)
1202 {
1203         int *offset = private;
1204         struct ocfs2_local_disk_chunk *dchunk;
1205
1206         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
1207         ocfs2_set_bit(*offset, dchunk->dqc_bitmap);
1208         le32_add_cpu(&dchunk->dqc_free, -1);
1209 }
1210
1211 /* Create dquot in the local file for given id */
1212 static int ocfs2_create_local_dquot(struct dquot *dquot)
1213 {
1214         struct super_block *sb = dquot->dq_sb;
1215         int type = dquot->dq_type;
1216         struct inode *lqinode = sb_dqopt(sb)->files[type];
1217         struct ocfs2_quota_chunk *chunk;
1218         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1219         int offset;
1220         int status;
1221
1222         chunk = ocfs2_find_free_entry(sb, type, &offset);
1223         if (!chunk) {
1224                 chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
1225                 if (IS_ERR(chunk))
1226                         return PTR_ERR(chunk);
1227         } else if (IS_ERR(chunk)) {
1228                 return PTR_ERR(chunk);
1229         }
1230         od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
1231         od->dq_chunk = chunk;
1232
1233         /* Initialize dquot structure on disk */
1234         status = ocfs2_local_write_dquot(dquot);
1235         if (status < 0) {
1236                 mlog_errno(status);
1237                 goto out;
1238         }
1239
1240         /* Mark structure as allocated */
1241         status = ocfs2_modify_bh(lqinode, chunk->qc_headerbh, olq_alloc_dquot,
1242                                  &offset);
1243         if (status < 0) {
1244                 mlog_errno(status);
1245                 goto out;
1246         }
1247 out:
1248         return status;
1249 }
1250
1251 /* Create entry in local file for dquot, load data from the global file */
1252 static int ocfs2_local_read_dquot(struct dquot *dquot)
1253 {
1254         int status;
1255
1256         mlog_entry("id=%u, type=%d\n", dquot->dq_id, dquot->dq_type);
1257
1258         status = ocfs2_global_read_dquot(dquot);
1259         if (status < 0) {
1260                 mlog_errno(status);
1261                 goto out_err;
1262         }
1263
1264         /* Now create entry in the local quota file */
1265         status = ocfs2_create_local_dquot(dquot);
1266         if (status < 0) {
1267                 mlog_errno(status);
1268                 goto out_err;
1269         }
1270         mlog_exit(0);
1271         return 0;
1272 out_err:
1273         mlog_exit(status);
1274         return status;
1275 }
1276
1277 /* Release dquot structure from local quota file. ocfs2_release_dquot() has
1278  * already started a transaction and obtained exclusive lock for global
1279  * quota file. */
1280 static int ocfs2_local_release_dquot(struct dquot *dquot)
1281 {
1282         int status;
1283         int type = dquot->dq_type;
1284         struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1285         struct super_block *sb = dquot->dq_sb;
1286         struct ocfs2_local_disk_chunk *dchunk;
1287         int offset;
1288         handle_t *handle = journal_current_handle();
1289
1290         BUG_ON(!handle);
1291         /* First write all local changes to global file */
1292         status = ocfs2_global_release_dquot(dquot);
1293         if (status < 0) {
1294                 mlog_errno(status);
1295                 goto out;
1296         }
1297
1298         status = ocfs2_journal_access_dq(handle,
1299                         INODE_CACHE(sb_dqopt(sb)->files[type]),
1300                         od->dq_chunk->qc_headerbh, OCFS2_JOURNAL_ACCESS_WRITE);
1301         if (status < 0) {
1302                 mlog_errno(status);
1303                 goto out;
1304         }
1305         offset = ol_dqblk_chunk_off(sb, od->dq_chunk->qc_num,
1306                                              od->dq_local_off);
1307         dchunk = (struct ocfs2_local_disk_chunk *)
1308                         (od->dq_chunk->qc_headerbh->b_data);
1309         /* Mark structure as freed */
1310         lock_buffer(od->dq_chunk->qc_headerbh);
1311         ocfs2_clear_bit(offset, dchunk->dqc_bitmap);
1312         le32_add_cpu(&dchunk->dqc_free, 1);
1313         unlock_buffer(od->dq_chunk->qc_headerbh);
1314         status = ocfs2_journal_dirty(handle, od->dq_chunk->qc_headerbh);
1315         if (status < 0) {
1316                 mlog_errno(status);
1317                 goto out;
1318         }
1319         status = 0;
1320 out:
1321         /* Clear the read bit so that next time someone uses this
1322          * dquot he reads fresh info from disk and allocates local
1323          * dquot structure */
1324         clear_bit(DQ_READ_B, &dquot->dq_flags);
1325         return status;
1326 }
1327
1328 static const struct quota_format_ops ocfs2_format_ops = {
1329         .check_quota_file       = ocfs2_local_check_quota_file,
1330         .read_file_info         = ocfs2_local_read_info,
1331         .write_file_info        = ocfs2_global_write_info,
1332         .free_file_info         = ocfs2_local_free_info,
1333         .read_dqblk             = ocfs2_local_read_dquot,
1334         .commit_dqblk           = ocfs2_local_write_dquot,
1335         .release_dqblk          = ocfs2_local_release_dquot,
1336 };
1337
1338 struct quota_format_type ocfs2_quota_format = {
1339         .qf_fmt_id = QFMT_OCFS2,
1340         .qf_ops = &ocfs2_format_ops,
1341         .qf_owner = THIS_MODULE
1342 };