Merge remote-tracking branch 'net/master'
[linux-2.6/next.git] / fs / ocfs2 / quota_global.c
blob92fcd575775a0d1123e902b8499cd1b26cd52aab
1 /*
2 * Implementation of operations over global quota file
3 */
4 #include <linux/spinlock.h>
5 #include <linux/fs.h>
6 #include <linux/slab.h>
7 #include <linux/quota.h>
8 #include <linux/quotaops.h>
9 #include <linux/dqblk_qtree.h>
10 #include <linux/jiffies.h>
11 #include <linux/writeback.h>
12 #include <linux/workqueue.h>
14 #include <cluster/masklog.h>
16 #include "ocfs2_fs.h"
17 #include "ocfs2.h"
18 #include "alloc.h"
19 #include "blockcheck.h"
20 #include "inode.h"
21 #include "journal.h"
22 #include "file.h"
23 #include "sysfile.h"
24 #include "dlmglue.h"
25 #include "uptodate.h"
26 #include "super.h"
27 #include "buffer_head_io.h"
28 #include "quota.h"
29 #include "ocfs2_trace.h"
32 * Locking of quotas with OCFS2 is rather complex. Here are rules that
33 * should be obeyed by all the functions:
34 * - any write of quota structure (either to local or global file) is protected
35 * by dqio_mutex or dquot->dq_lock.
36 * - any modification of global quota file holds inode cluster lock, i_mutex,
37 * and ip_alloc_sem of the global quota file (achieved by
38 * ocfs2_lock_global_qf). It also has to hold qinfo_lock.
39 * - an allocation of new blocks for local quota file is protected by
40 * its ip_alloc_sem
42 * A rough sketch of locking dependencies (lf = local file, gf = global file):
43 * Normal filesystem operation:
44 * start_trans -> dqio_mutex -> write to lf
45 * Syncing of local and global file:
46 * ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock ->
47 * write to gf
48 * -> write to lf
49 * Acquire dquot for the first time:
50 * dq_lock -> ocfs2_lock_global_qf -> qinfo_lock -> read from gf
51 * -> alloc space for gf
52 * -> start_trans -> qinfo_lock -> write to gf
53 * -> ip_alloc_sem of lf -> alloc space for lf
54 * -> write to lf
55 * Release last reference to dquot:
56 * dq_lock -> ocfs2_lock_global_qf -> start_trans -> qinfo_lock -> write to gf
57 * -> write to lf
58 * Note that all the above operations also hold the inode cluster lock of lf.
59 * Recovery:
60 * inode cluster lock of recovered lf
61 * -> read bitmaps -> ip_alloc_sem of lf
62 * -> ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock ->
63 * write to gf
66 static void qsync_work_fn(struct work_struct *work);
68 static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
70 struct ocfs2_global_disk_dqblk *d = dp;
71 struct mem_dqblk *m = &dquot->dq_dqb;
73 /* Update from disk only entries not set by the admin */
74 if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
75 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
76 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
78 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
79 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
80 if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
81 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
82 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
84 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
85 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
86 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
87 m->dqb_btime = le64_to_cpu(d->dqb_btime);
88 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
89 m->dqb_itime = le64_to_cpu(d->dqb_itime);
90 OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
93 static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
95 struct ocfs2_global_disk_dqblk *d = dp;
96 struct mem_dqblk *m = &dquot->dq_dqb;
98 d->dqb_id = cpu_to_le32(dquot->dq_id);
99 d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
100 d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
101 d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
102 d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
103 d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
104 d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
105 d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
106 d->dqb_btime = cpu_to_le64(m->dqb_btime);
107 d->dqb_itime = cpu_to_le64(m->dqb_itime);
108 d->dqb_pad1 = d->dqb_pad2 = 0;
111 static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
113 struct ocfs2_global_disk_dqblk *d = dp;
114 struct ocfs2_mem_dqinfo *oinfo =
115 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
117 if (qtree_entry_unused(&oinfo->dqi_gi, dp))
118 return 0;
119 return le32_to_cpu(d->dqb_id) == dquot->dq_id;
122 struct qtree_fmt_operations ocfs2_global_ops = {
123 .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
124 .disk2mem_dqblk = ocfs2_global_disk2memdqb,
125 .is_id = ocfs2_global_is_id,
128 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh)
130 struct ocfs2_disk_dqtrailer *dqt =
131 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
133 trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr);
135 BUG_ON(!buffer_uptodate(bh));
138 * If the ecc fails, we return the error but otherwise
139 * leave the filesystem running. We know any error is
140 * local to this block.
142 return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
145 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
146 struct buffer_head **bhp)
148 int rc;
150 *bhp = NULL;
151 rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0,
152 ocfs2_validate_quota_block);
153 if (rc)
154 mlog_errno(rc);
155 return rc;
158 /* Read data from global quotafile - avoid pagecache and such because we cannot
159 * afford acquiring the locks... We use quota cluster lock to serialize
160 * operations. Caller is responsible for acquiring it. */
161 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
162 size_t len, loff_t off)
164 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
165 struct inode *gqinode = oinfo->dqi_gqinode;
166 loff_t i_size = i_size_read(gqinode);
167 int offset = off & (sb->s_blocksize - 1);
168 sector_t blk = off >> sb->s_blocksize_bits;
169 int err = 0;
170 struct buffer_head *bh;
171 size_t toread, tocopy;
172 u64 pblock = 0, pcount = 0;
174 if (off > i_size)
175 return 0;
176 if (off + len > i_size)
177 len = i_size - off;
178 toread = len;
179 while (toread > 0) {
180 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
181 if (!pcount) {
182 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock,
183 &pcount, NULL);
184 if (err) {
185 mlog_errno(err);
186 return err;
188 } else {
189 pcount--;
190 pblock++;
192 bh = NULL;
193 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
194 if (err) {
195 mlog_errno(err);
196 return err;
198 memcpy(data, bh->b_data + offset, tocopy);
199 brelse(bh);
200 offset = 0;
201 toread -= tocopy;
202 data += tocopy;
203 blk++;
205 return len;
208 /* Write to quotafile (we know the transaction is already started and has
209 * enough credits) */
210 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
211 const char *data, size_t len, loff_t off)
213 struct mem_dqinfo *info = sb_dqinfo(sb, type);
214 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
215 struct inode *gqinode = oinfo->dqi_gqinode;
216 int offset = off & (sb->s_blocksize - 1);
217 sector_t blk = off >> sb->s_blocksize_bits;
218 int err = 0, new = 0, ja_type;
219 struct buffer_head *bh = NULL;
220 handle_t *handle = journal_current_handle();
221 u64 pblock, pcount;
223 if (!handle) {
224 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
225 "because transaction was not started.\n",
226 (unsigned long long)off, (unsigned long long)len);
227 return -EIO;
229 if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
230 WARN_ON(1);
231 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
234 if (gqinode->i_size < off + len) {
235 loff_t rounded_end =
236 ocfs2_align_bytes_to_blocks(sb, off + len);
238 /* Space is already allocated in ocfs2_acquire_dquot() */
239 err = ocfs2_simple_size_update(gqinode,
240 oinfo->dqi_gqi_bh,
241 rounded_end);
242 if (err < 0)
243 goto out;
244 new = 1;
246 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL);
247 if (err) {
248 mlog_errno(err);
249 goto out;
251 /* Not rewriting whole block? */
252 if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
253 !new) {
254 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
255 ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
256 } else {
257 bh = sb_getblk(sb, pblock);
258 if (!bh)
259 err = -ENOMEM;
260 ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
262 if (err) {
263 mlog_errno(err);
264 goto out;
266 lock_buffer(bh);
267 if (new)
268 memset(bh->b_data, 0, sb->s_blocksize);
269 memcpy(bh->b_data + offset, data, len);
270 flush_dcache_page(bh->b_page);
271 set_buffer_uptodate(bh);
272 unlock_buffer(bh);
273 ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh);
274 err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
275 ja_type);
276 if (err < 0) {
277 brelse(bh);
278 goto out;
280 ocfs2_journal_dirty(handle, bh);
281 brelse(bh);
282 out:
283 if (err) {
284 mlog_errno(err);
285 return err;
287 gqinode->i_version++;
288 ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
289 return len;
292 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
294 int status;
295 struct buffer_head *bh = NULL;
297 status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
298 if (status < 0)
299 return status;
300 spin_lock(&dq_data_lock);
301 if (!oinfo->dqi_gqi_count++)
302 oinfo->dqi_gqi_bh = bh;
303 else
304 WARN_ON(bh != oinfo->dqi_gqi_bh);
305 spin_unlock(&dq_data_lock);
306 if (ex) {
307 mutex_lock(&oinfo->dqi_gqinode->i_mutex);
308 down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
309 } else {
310 down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
312 return 0;
315 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
317 if (ex) {
318 up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
319 mutex_unlock(&oinfo->dqi_gqinode->i_mutex);
320 } else {
321 up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
323 ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
324 brelse(oinfo->dqi_gqi_bh);
325 spin_lock(&dq_data_lock);
326 if (!--oinfo->dqi_gqi_count)
327 oinfo->dqi_gqi_bh = NULL;
328 spin_unlock(&dq_data_lock);
331 /* Read information header from global quota file */
332 int ocfs2_global_read_info(struct super_block *sb, int type)
334 struct inode *gqinode = NULL;
335 unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
336 GROUP_QUOTA_SYSTEM_INODE };
337 struct ocfs2_global_disk_dqinfo dinfo;
338 struct mem_dqinfo *info = sb_dqinfo(sb, type);
339 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
340 u64 pcount;
341 int status;
343 /* Read global header */
344 gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
345 OCFS2_INVALID_SLOT);
346 if (!gqinode) {
347 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
348 type);
349 status = -EINVAL;
350 goto out_err;
352 oinfo->dqi_gi.dqi_sb = sb;
353 oinfo->dqi_gi.dqi_type = type;
354 ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
355 oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
356 oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
357 oinfo->dqi_gqi_bh = NULL;
358 oinfo->dqi_gqi_count = 0;
359 oinfo->dqi_gqinode = gqinode;
360 status = ocfs2_lock_global_qf(oinfo, 0);
361 if (status < 0) {
362 mlog_errno(status);
363 goto out_err;
366 status = ocfs2_extent_map_get_blocks(gqinode, 0, &oinfo->dqi_giblk,
367 &pcount, NULL);
368 if (status < 0)
369 goto out_unlock;
371 status = ocfs2_qinfo_lock(oinfo, 0);
372 if (status < 0)
373 goto out_unlock;
374 status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
375 sizeof(struct ocfs2_global_disk_dqinfo),
376 OCFS2_GLOBAL_INFO_OFF);
377 ocfs2_qinfo_unlock(oinfo, 0);
378 ocfs2_unlock_global_qf(oinfo, 0);
379 if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
380 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
381 status);
382 if (status >= 0)
383 status = -EIO;
384 mlog_errno(status);
385 goto out_err;
387 info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
388 info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
389 oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
390 oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
391 oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
392 oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
393 oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
394 oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
395 OCFS2_QBLK_RESERVED_SPACE;
396 oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
397 INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
398 schedule_delayed_work(&oinfo->dqi_sync_work,
399 msecs_to_jiffies(oinfo->dqi_syncms));
401 out_err:
402 if (status)
403 mlog_errno(status);
404 return status;
405 out_unlock:
406 ocfs2_unlock_global_qf(oinfo, 0);
407 mlog_errno(status);
408 goto out_err;
411 /* Write information to global quota file. Expects exlusive lock on quota
412 * file inode and quota info */
413 static int __ocfs2_global_write_info(struct super_block *sb, int type)
415 struct mem_dqinfo *info = sb_dqinfo(sb, type);
416 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
417 struct ocfs2_global_disk_dqinfo dinfo;
418 ssize_t size;
420 spin_lock(&dq_data_lock);
421 info->dqi_flags &= ~DQF_INFO_DIRTY;
422 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
423 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
424 spin_unlock(&dq_data_lock);
425 dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
426 dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
427 dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
428 dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
429 size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
430 sizeof(struct ocfs2_global_disk_dqinfo),
431 OCFS2_GLOBAL_INFO_OFF);
432 if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
433 mlog(ML_ERROR, "Cannot write global quota info structure\n");
434 if (size >= 0)
435 size = -EIO;
436 return size;
438 return 0;
441 int ocfs2_global_write_info(struct super_block *sb, int type)
443 int err;
444 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
446 err = ocfs2_qinfo_lock(info, 1);
447 if (err < 0)
448 return err;
449 err = __ocfs2_global_write_info(sb, type);
450 ocfs2_qinfo_unlock(info, 1);
451 return err;
454 static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
456 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
459 * We may need to allocate tree blocks and a leaf block but not the
460 * root block
462 return oinfo->dqi_gi.dqi_qtree_depth;
465 static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
467 /* We modify all the allocated blocks, tree root, info block and
468 * the inode */
469 return (ocfs2_global_qinit_alloc(sb, type) + 2) *
470 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1;
473 /* Sync local information about quota modifications with global quota file.
474 * Caller must have started the transaction and obtained exclusive lock for
475 * global quota file inode */
476 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
478 int err, err2;
479 struct super_block *sb = dquot->dq_sb;
480 int type = dquot->dq_type;
481 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
482 struct ocfs2_global_disk_dqblk dqblk;
483 s64 spacechange, inodechange;
484 time_t olditime, oldbtime;
486 err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
487 sizeof(struct ocfs2_global_disk_dqblk),
488 dquot->dq_off);
489 if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
490 if (err >= 0) {
491 mlog(ML_ERROR, "Short read from global quota file "
492 "(%u read)\n", err);
493 err = -EIO;
495 goto out;
498 /* Update space and inode usage. Get also other information from
499 * global quota file so that we don't overwrite any changes there.
500 * We are */
501 spin_lock(&dq_data_lock);
502 spacechange = dquot->dq_dqb.dqb_curspace -
503 OCFS2_DQUOT(dquot)->dq_origspace;
504 inodechange = dquot->dq_dqb.dqb_curinodes -
505 OCFS2_DQUOT(dquot)->dq_originodes;
506 olditime = dquot->dq_dqb.dqb_itime;
507 oldbtime = dquot->dq_dqb.dqb_btime;
508 ocfs2_global_disk2memdqb(dquot, &dqblk);
509 trace_ocfs2_sync_dquot(dquot->dq_id, dquot->dq_dqb.dqb_curspace,
510 (long long)spacechange,
511 dquot->dq_dqb.dqb_curinodes,
512 (long long)inodechange);
513 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
514 dquot->dq_dqb.dqb_curspace += spacechange;
515 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
516 dquot->dq_dqb.dqb_curinodes += inodechange;
517 /* Set properly space grace time... */
518 if (dquot->dq_dqb.dqb_bsoftlimit &&
519 dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
520 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
521 oldbtime > 0) {
522 if (dquot->dq_dqb.dqb_btime > 0)
523 dquot->dq_dqb.dqb_btime =
524 min(dquot->dq_dqb.dqb_btime, oldbtime);
525 else
526 dquot->dq_dqb.dqb_btime = oldbtime;
528 } else {
529 dquot->dq_dqb.dqb_btime = 0;
530 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
532 /* Set properly inode grace time... */
533 if (dquot->dq_dqb.dqb_isoftlimit &&
534 dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
535 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
536 olditime > 0) {
537 if (dquot->dq_dqb.dqb_itime > 0)
538 dquot->dq_dqb.dqb_itime =
539 min(dquot->dq_dqb.dqb_itime, olditime);
540 else
541 dquot->dq_dqb.dqb_itime = olditime;
543 } else {
544 dquot->dq_dqb.dqb_itime = 0;
545 clear_bit(DQ_INODES_B, &dquot->dq_flags);
547 /* All information is properly updated, clear the flags */
548 __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
549 __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
550 __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
551 __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
552 __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
553 __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
554 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
555 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
556 spin_unlock(&dq_data_lock);
557 err = ocfs2_qinfo_lock(info, freeing);
558 if (err < 0) {
559 mlog(ML_ERROR, "Failed to lock quota info, losing quota write"
560 " (type=%d, id=%u)\n", dquot->dq_type,
561 (unsigned)dquot->dq_id);
562 goto out;
564 if (freeing)
565 OCFS2_DQUOT(dquot)->dq_use_count--;
566 err = qtree_write_dquot(&info->dqi_gi, dquot);
567 if (err < 0)
568 goto out_qlock;
569 if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
570 err = qtree_release_dquot(&info->dqi_gi, dquot);
571 if (info_dirty(sb_dqinfo(sb, type))) {
572 err2 = __ocfs2_global_write_info(sb, type);
573 if (!err)
574 err = err2;
577 out_qlock:
578 ocfs2_qinfo_unlock(info, freeing);
579 out:
580 if (err < 0)
581 mlog_errno(err);
582 return err;
586 * Functions for periodic syncing of dquots with global file
588 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
590 handle_t *handle;
591 struct super_block *sb = dquot->dq_sb;
592 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
593 struct ocfs2_super *osb = OCFS2_SB(sb);
594 int status = 0;
596 trace_ocfs2_sync_dquot_helper(dquot->dq_id, dquot->dq_type,
597 type, sb->s_id);
598 if (type != dquot->dq_type)
599 goto out;
600 status = ocfs2_lock_global_qf(oinfo, 1);
601 if (status < 0)
602 goto out;
604 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
605 if (IS_ERR(handle)) {
606 status = PTR_ERR(handle);
607 mlog_errno(status);
608 goto out_ilock;
610 mutex_lock(&sb_dqopt(sb)->dqio_mutex);
611 status = ocfs2_sync_dquot(dquot);
612 if (status < 0)
613 mlog_errno(status);
614 /* We have to write local structure as well... */
615 status = ocfs2_local_write_dquot(dquot);
616 if (status < 0)
617 mlog_errno(status);
618 mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
619 ocfs2_commit_trans(osb, handle);
620 out_ilock:
621 ocfs2_unlock_global_qf(oinfo, 1);
622 out:
623 return status;
626 static void qsync_work_fn(struct work_struct *work)
628 struct ocfs2_mem_dqinfo *oinfo = container_of(work,
629 struct ocfs2_mem_dqinfo,
630 dqi_sync_work.work);
631 struct super_block *sb = oinfo->dqi_gqinode->i_sb;
633 dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
634 schedule_delayed_work(&oinfo->dqi_sync_work,
635 msecs_to_jiffies(oinfo->dqi_syncms));
639 * Wrappers for generic quota functions
642 static int ocfs2_write_dquot(struct dquot *dquot)
644 handle_t *handle;
645 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
646 int status = 0;
648 trace_ocfs2_write_dquot(dquot->dq_id, dquot->dq_type);
650 handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
651 if (IS_ERR(handle)) {
652 status = PTR_ERR(handle);
653 mlog_errno(status);
654 goto out;
656 mutex_lock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
657 status = ocfs2_local_write_dquot(dquot);
658 mutex_unlock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
659 ocfs2_commit_trans(osb, handle);
660 out:
661 return status;
664 static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
666 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
668 * We modify tree, leaf block, global info, local chunk header,
669 * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
670 * accounts for inode update
672 return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
673 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
674 OCFS2_QINFO_WRITE_CREDITS +
675 OCFS2_INODE_UPDATE_CREDITS;
678 static int ocfs2_release_dquot(struct dquot *dquot)
680 handle_t *handle;
681 struct ocfs2_mem_dqinfo *oinfo =
682 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
683 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
684 int status = 0;
686 trace_ocfs2_release_dquot(dquot->dq_id, dquot->dq_type);
688 mutex_lock(&dquot->dq_lock);
689 /* Check whether we are not racing with some other dqget() */
690 if (atomic_read(&dquot->dq_count) > 1)
691 goto out;
692 status = ocfs2_lock_global_qf(oinfo, 1);
693 if (status < 0)
694 goto out;
695 handle = ocfs2_start_trans(osb,
696 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
697 if (IS_ERR(handle)) {
698 status = PTR_ERR(handle);
699 mlog_errno(status);
700 goto out_ilock;
703 status = ocfs2_global_release_dquot(dquot);
704 if (status < 0) {
705 mlog_errno(status);
706 goto out_trans;
708 status = ocfs2_local_release_dquot(handle, dquot);
710 * If we fail here, we cannot do much as global structure is
711 * already released. So just complain...
713 if (status < 0)
714 mlog_errno(status);
715 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
716 out_trans:
717 ocfs2_commit_trans(osb, handle);
718 out_ilock:
719 ocfs2_unlock_global_qf(oinfo, 1);
720 out:
721 mutex_unlock(&dquot->dq_lock);
722 if (status)
723 mlog_errno(status);
724 return status;
728 * Read global dquot structure from disk or create it if it does
729 * not exist. Also update use count of the global structure and
730 * create structure in node-local quota file.
732 static int ocfs2_acquire_dquot(struct dquot *dquot)
734 int status = 0, err;
735 int ex = 0;
736 struct super_block *sb = dquot->dq_sb;
737 struct ocfs2_super *osb = OCFS2_SB(sb);
738 int type = dquot->dq_type;
739 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
740 struct inode *gqinode = info->dqi_gqinode;
741 int need_alloc = ocfs2_global_qinit_alloc(sb, type);
742 handle_t *handle;
744 trace_ocfs2_acquire_dquot(dquot->dq_id, type);
745 mutex_lock(&dquot->dq_lock);
747 * We need an exclusive lock, because we're going to update use count
748 * and instantiate possibly new dquot structure
750 status = ocfs2_lock_global_qf(info, 1);
751 if (status < 0)
752 goto out;
753 if (!test_bit(DQ_READ_B, &dquot->dq_flags)) {
754 status = ocfs2_qinfo_lock(info, 0);
755 if (status < 0)
756 goto out_dq;
757 status = qtree_read_dquot(&info->dqi_gi, dquot);
758 ocfs2_qinfo_unlock(info, 0);
759 if (status < 0)
760 goto out_dq;
762 set_bit(DQ_READ_B, &dquot->dq_flags);
764 OCFS2_DQUOT(dquot)->dq_use_count++;
765 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
766 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
767 if (!dquot->dq_off) { /* No real quota entry? */
768 ex = 1;
770 * Add blocks to quota file before we start a transaction since
771 * locking allocators ranks above a transaction start
773 WARN_ON(journal_current_handle());
774 status = ocfs2_extend_no_holes(gqinode, NULL,
775 gqinode->i_size + (need_alloc << sb->s_blocksize_bits),
776 gqinode->i_size);
777 if (status < 0)
778 goto out_dq;
781 handle = ocfs2_start_trans(osb,
782 ocfs2_calc_global_qinit_credits(sb, type));
783 if (IS_ERR(handle)) {
784 status = PTR_ERR(handle);
785 goto out_dq;
787 status = ocfs2_qinfo_lock(info, ex);
788 if (status < 0)
789 goto out_trans;
790 status = qtree_write_dquot(&info->dqi_gi, dquot);
791 if (ex && info_dirty(sb_dqinfo(sb, type))) {
792 err = __ocfs2_global_write_info(sb, type);
793 if (!status)
794 status = err;
796 ocfs2_qinfo_unlock(info, ex);
797 out_trans:
798 ocfs2_commit_trans(osb, handle);
799 out_dq:
800 ocfs2_unlock_global_qf(info, 1);
801 if (status < 0)
802 goto out;
804 status = ocfs2_create_local_dquot(dquot);
805 if (status < 0)
806 goto out;
807 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
808 out:
809 mutex_unlock(&dquot->dq_lock);
810 if (status)
811 mlog_errno(status);
812 return status;
815 static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
817 unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
818 (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
819 (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
820 (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
821 (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
822 (1 << (DQ_LASTSET_B + QIF_ITIME_B));
823 int sync = 0;
824 int status;
825 struct super_block *sb = dquot->dq_sb;
826 int type = dquot->dq_type;
827 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
828 handle_t *handle;
829 struct ocfs2_super *osb = OCFS2_SB(sb);
831 trace_ocfs2_mark_dquot_dirty(dquot->dq_id, type);
833 /* In case user set some limits, sync dquot immediately to global
834 * quota file so that information propagates quicker */
835 spin_lock(&dq_data_lock);
836 if (dquot->dq_flags & mask)
837 sync = 1;
838 spin_unlock(&dq_data_lock);
839 /* This is a slight hack but we can't afford getting global quota
840 * lock if we already have a transaction started. */
841 if (!sync || journal_current_handle()) {
842 status = ocfs2_write_dquot(dquot);
843 goto out;
845 status = ocfs2_lock_global_qf(oinfo, 1);
846 if (status < 0)
847 goto out;
848 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
849 if (IS_ERR(handle)) {
850 status = PTR_ERR(handle);
851 mlog_errno(status);
852 goto out_ilock;
854 mutex_lock(&sb_dqopt(sb)->dqio_mutex);
855 status = ocfs2_sync_dquot(dquot);
856 if (status < 0) {
857 mlog_errno(status);
858 goto out_dlock;
860 /* Now write updated local dquot structure */
861 status = ocfs2_local_write_dquot(dquot);
862 out_dlock:
863 mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
864 ocfs2_commit_trans(osb, handle);
865 out_ilock:
866 ocfs2_unlock_global_qf(oinfo, 1);
867 out:
868 if (status)
869 mlog_errno(status);
870 return status;
873 /* This should happen only after set_dqinfo(). */
874 static int ocfs2_write_info(struct super_block *sb, int type)
876 handle_t *handle;
877 int status = 0;
878 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
880 status = ocfs2_lock_global_qf(oinfo, 1);
881 if (status < 0)
882 goto out;
883 handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
884 if (IS_ERR(handle)) {
885 status = PTR_ERR(handle);
886 mlog_errno(status);
887 goto out_ilock;
889 status = dquot_commit_info(sb, type);
890 ocfs2_commit_trans(OCFS2_SB(sb), handle);
891 out_ilock:
892 ocfs2_unlock_global_qf(oinfo, 1);
893 out:
894 if (status)
895 mlog_errno(status);
896 return status;
899 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
901 struct ocfs2_dquot *dquot =
902 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
904 if (!dquot)
905 return NULL;
906 return &dquot->dq_dquot;
909 static void ocfs2_destroy_dquot(struct dquot *dquot)
911 kmem_cache_free(ocfs2_dquot_cachep, dquot);
914 const struct dquot_operations ocfs2_quota_operations = {
915 /* We never make dquot dirty so .write_dquot is never called */
916 .acquire_dquot = ocfs2_acquire_dquot,
917 .release_dquot = ocfs2_release_dquot,
918 .mark_dirty = ocfs2_mark_dquot_dirty,
919 .write_info = ocfs2_write_info,
920 .alloc_dquot = ocfs2_alloc_dquot,
921 .destroy_dquot = ocfs2_destroy_dquot,