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Fix gcc 4.5.1 miscompiling drivers/char/i8k.c (again)
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ocfs2 / quota_local.c
blob21f9e71223caf53b10c3f2b128782aef14169889
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_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 };
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree