1 // SPDX-License-Identifier: GPL-2.0
3 * Implementation of operations over global quota file
5 #include <linux/spinlock.h>
7 #include <linux/slab.h>
8 #include <linux/quota.h>
9 #include <linux/quotaops.h>
10 #include <linux/dqblk_qtree.h>
11 #include <linux/jiffies.h>
12 #include <linux/writeback.h>
13 #include <linux/workqueue.h>
14 #include <linux/llist.h>
15 #include <linux/iversion.h>
17 #include <cluster/masklog.h>
22 #include "blockcheck.h"
30 #include "buffer_head_io.h"
32 #include "ocfs2_trace.h"
35 * Locking of quotas with OCFS2 is rather complex. Here are rules that
36 * should be obeyed by all the functions:
37 * - any write of quota structure (either to local or global file) is protected
38 * by dqio_sem or dquot->dq_lock.
39 * - any modification of global quota file holds inode cluster lock, i_rwsem,
40 * and ip_alloc_sem of the global quota file (achieved by
41 * ocfs2_lock_global_qf). It also has to hold qinfo_lock.
42 * - an allocation of new blocks for local quota file is protected by
45 * A rough sketch of locking dependencies (lf = local file, gf = global file):
46 * Normal filesystem operation:
47 * start_trans -> dqio_sem -> write to lf
48 * Syncing of local and global file:
49 * ocfs2_lock_global_qf -> start_trans -> dqio_sem -> qinfo_lock ->
52 * Acquire dquot for the first time:
53 * dq_lock -> ocfs2_lock_global_qf -> qinfo_lock -> read from gf
54 * -> alloc space for gf
55 * -> start_trans -> qinfo_lock -> write to gf
56 * -> ip_alloc_sem of lf -> alloc space for lf
58 * Release last reference to dquot:
59 * dq_lock -> ocfs2_lock_global_qf -> start_trans -> qinfo_lock -> write to gf
61 * Note that all the above operations also hold the inode cluster lock of lf.
63 * inode cluster lock of recovered lf
64 * -> read bitmaps -> ip_alloc_sem of lf
65 * -> ocfs2_lock_global_qf -> start_trans -> dqio_sem -> qinfo_lock ->
69 static void qsync_work_fn(struct work_struct *work);
71 static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
73 struct ocfs2_global_disk_dqblk *d = dp;
74 struct mem_dqblk *m = &dquot->dq_dqb;
76 /* Update from disk only entries not set by the admin */
77 if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
78 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
79 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
81 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
82 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
83 if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
84 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
85 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
87 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
88 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
89 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
90 m->dqb_btime = le64_to_cpu(d->dqb_btime);
91 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
92 m->dqb_itime = le64_to_cpu(d->dqb_itime);
93 OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
96 static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
98 struct ocfs2_global_disk_dqblk *d = dp;
99 struct mem_dqblk *m = &dquot->dq_dqb;
101 d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
102 d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
103 d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
104 d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
105 d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
106 d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
107 d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
108 d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
109 d->dqb_btime = cpu_to_le64(m->dqb_btime);
110 d->dqb_itime = cpu_to_le64(m->dqb_itime);
111 d->dqb_pad1 = d->dqb_pad2 = 0;
114 static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
116 struct ocfs2_global_disk_dqblk *d = dp;
117 struct ocfs2_mem_dqinfo *oinfo =
118 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
120 if (qtree_entry_unused(&oinfo->dqi_gi, dp))
123 return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
124 le32_to_cpu(d->dqb_id)),
128 const struct qtree_fmt_operations ocfs2_global_ops = {
129 .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
130 .disk2mem_dqblk = ocfs2_global_disk2memdqb,
131 .is_id = ocfs2_global_is_id,
134 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh)
136 struct ocfs2_disk_dqtrailer *dqt =
137 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
139 trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr);
141 BUG_ON(!buffer_uptodate(bh));
144 * If the ecc fails, we return the error but otherwise
145 * leave the filesystem running. We know any error is
146 * local to this block.
148 return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
151 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
152 struct buffer_head **bhp)
157 rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0,
158 ocfs2_validate_quota_block);
164 /* Read data from global quotafile - avoid pagecache and such because we cannot
165 * afford acquiring the locks... We use quota cluster lock to serialize
166 * operations. Caller is responsible for acquiring it. */
167 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
168 size_t len, loff_t off)
170 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
171 struct inode *gqinode = oinfo->dqi_gqinode;
172 loff_t i_size = i_size_read(gqinode);
173 int offset = off & (sb->s_blocksize - 1);
174 sector_t blk = off >> sb->s_blocksize_bits;
176 struct buffer_head *bh;
177 size_t toread, tocopy;
178 u64 pblock = 0, pcount = 0;
182 if (off + len > i_size)
186 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
188 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock,
199 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
204 memcpy(data, bh->b_data + offset, tocopy);
214 /* Write to quotafile (we know the transaction is already started and has
216 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
217 const char *data, size_t len, loff_t off)
219 struct mem_dqinfo *info = sb_dqinfo(sb, type);
220 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
221 struct inode *gqinode = oinfo->dqi_gqinode;
222 int offset = off & (sb->s_blocksize - 1);
223 sector_t blk = off >> sb->s_blocksize_bits;
224 int err = 0, new = 0, ja_type;
225 struct buffer_head *bh = NULL;
226 handle_t *handle = journal_current_handle();
230 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
231 "because transaction was not started.\n",
232 (unsigned long long)off, (unsigned long long)len);
235 if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
237 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
240 if (i_size_read(gqinode) < off + len) {
242 ocfs2_align_bytes_to_blocks(sb, off + len);
244 /* Space is already allocated in ocfs2_acquire_dquot() */
245 err = ocfs2_simple_size_update(gqinode,
252 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL);
257 /* Not rewriting whole block? */
258 if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
260 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
261 ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
263 bh = sb_getblk(sb, pblock);
266 ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
274 memset(bh->b_data, 0, sb->s_blocksize);
275 memcpy(bh->b_data + offset, data, len);
276 flush_dcache_page(bh->b_page);
277 set_buffer_uptodate(bh);
279 ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh);
280 err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
286 ocfs2_journal_dirty(handle, bh);
293 inode_inc_iversion(gqinode);
294 ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
298 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
301 struct buffer_head *bh = NULL;
303 status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
306 spin_lock(&dq_data_lock);
307 if (!oinfo->dqi_gqi_count++)
308 oinfo->dqi_gqi_bh = bh;
310 WARN_ON(bh != oinfo->dqi_gqi_bh);
311 spin_unlock(&dq_data_lock);
313 inode_lock(oinfo->dqi_gqinode);
314 down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
316 down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
321 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
324 up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
325 inode_unlock(oinfo->dqi_gqinode);
327 up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
329 ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
330 brelse(oinfo->dqi_gqi_bh);
331 spin_lock(&dq_data_lock);
332 if (!--oinfo->dqi_gqi_count)
333 oinfo->dqi_gqi_bh = NULL;
334 spin_unlock(&dq_data_lock);
337 /* Read information header from global quota file */
338 int ocfs2_global_read_info(struct super_block *sb, int type)
340 unsigned int ino[OCFS2_MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
341 GROUP_QUOTA_SYSTEM_INODE };
342 struct ocfs2_global_disk_dqinfo dinfo;
343 struct mem_dqinfo *info = sb_dqinfo(sb, type);
344 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
348 oinfo->dqi_gi.dqi_sb = sb;
349 oinfo->dqi_gi.dqi_type = type;
350 ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
351 oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
352 oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
353 oinfo->dqi_gqi_bh = NULL;
354 oinfo->dqi_gqi_count = 0;
356 /* Read global header */
357 oinfo->dqi_gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
359 if (!oinfo->dqi_gqinode) {
360 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
366 status = ocfs2_lock_global_qf(oinfo, 0);
372 status = ocfs2_extent_map_get_blocks(oinfo->dqi_gqinode, 0, &oinfo->dqi_giblk,
377 status = ocfs2_qinfo_lock(oinfo, 0);
380 status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
381 sizeof(struct ocfs2_global_disk_dqinfo),
382 OCFS2_GLOBAL_INFO_OFF);
383 ocfs2_qinfo_unlock(oinfo, 0);
384 ocfs2_unlock_global_qf(oinfo, 0);
385 if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
386 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
393 info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
394 info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
395 oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
396 oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
397 oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
398 oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
399 oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
400 oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
401 OCFS2_QBLK_RESERVED_SPACE;
402 oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
403 INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
404 schedule_delayed_work(&oinfo->dqi_sync_work,
405 msecs_to_jiffies(oinfo->dqi_syncms));
410 ocfs2_unlock_global_qf(oinfo, 0);
415 /* Write information to global quota file. Expects exclusive lock on quota
416 * file inode and quota info */
417 static int __ocfs2_global_write_info(struct super_block *sb, int type)
419 struct mem_dqinfo *info = sb_dqinfo(sb, type);
420 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
421 struct ocfs2_global_disk_dqinfo dinfo;
424 spin_lock(&dq_data_lock);
425 info->dqi_flags &= ~DQF_INFO_DIRTY;
426 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
427 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
428 spin_unlock(&dq_data_lock);
429 dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
430 dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
431 dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
432 dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
433 size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
434 sizeof(struct ocfs2_global_disk_dqinfo),
435 OCFS2_GLOBAL_INFO_OFF);
436 if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
437 mlog(ML_ERROR, "Cannot write global quota info structure\n");
445 int ocfs2_global_write_info(struct super_block *sb, int type)
448 struct quota_info *dqopt = sb_dqopt(sb);
449 struct ocfs2_mem_dqinfo *info = dqopt->info[type].dqi_priv;
450 unsigned int memalloc;
452 down_write(&dqopt->dqio_sem);
453 memalloc = memalloc_nofs_save();
454 err = ocfs2_qinfo_lock(info, 1);
457 err = __ocfs2_global_write_info(sb, type);
458 ocfs2_qinfo_unlock(info, 1);
460 memalloc_nofs_restore(memalloc);
461 up_write(&dqopt->dqio_sem);
465 static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
467 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
470 * We may need to allocate tree blocks and a leaf block but not the
473 return oinfo->dqi_gi.dqi_qtree_depth;
476 static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
478 /* We modify all the allocated blocks, tree root, info block and
480 return (ocfs2_global_qinit_alloc(sb, type) + 2) *
481 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1;
484 /* Sync local information about quota modifications with global quota file.
485 * Caller must have started the transaction and obtained exclusive lock for
486 * global quota file inode */
487 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
490 struct super_block *sb = dquot->dq_sb;
491 int type = dquot->dq_id.type;
492 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
493 struct ocfs2_global_disk_dqblk dqblk;
494 s64 spacechange, inodechange;
495 time64_t olditime, oldbtime;
497 err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
498 sizeof(struct ocfs2_global_disk_dqblk),
500 if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
502 mlog(ML_ERROR, "Short read from global quota file "
509 /* Update space and inode usage. Get also other information from
510 * global quota file so that we don't overwrite any changes there.
512 spin_lock(&dquot->dq_dqb_lock);
513 spacechange = dquot->dq_dqb.dqb_curspace -
514 OCFS2_DQUOT(dquot)->dq_origspace;
515 inodechange = dquot->dq_dqb.dqb_curinodes -
516 OCFS2_DQUOT(dquot)->dq_originodes;
517 olditime = dquot->dq_dqb.dqb_itime;
518 oldbtime = dquot->dq_dqb.dqb_btime;
519 ocfs2_global_disk2memdqb(dquot, &dqblk);
520 trace_ocfs2_sync_dquot(from_kqid(&init_user_ns, dquot->dq_id),
521 dquot->dq_dqb.dqb_curspace,
522 (long long)spacechange,
523 dquot->dq_dqb.dqb_curinodes,
524 (long long)inodechange);
525 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
526 dquot->dq_dqb.dqb_curspace += spacechange;
527 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
528 dquot->dq_dqb.dqb_curinodes += inodechange;
529 /* Set properly space grace time... */
530 if (dquot->dq_dqb.dqb_bsoftlimit &&
531 dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
532 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
534 if (dquot->dq_dqb.dqb_btime > 0)
535 dquot->dq_dqb.dqb_btime =
536 min(dquot->dq_dqb.dqb_btime, oldbtime);
538 dquot->dq_dqb.dqb_btime = oldbtime;
541 dquot->dq_dqb.dqb_btime = 0;
542 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
544 /* Set properly inode grace time... */
545 if (dquot->dq_dqb.dqb_isoftlimit &&
546 dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
547 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
549 if (dquot->dq_dqb.dqb_itime > 0)
550 dquot->dq_dqb.dqb_itime =
551 min(dquot->dq_dqb.dqb_itime, olditime);
553 dquot->dq_dqb.dqb_itime = olditime;
556 dquot->dq_dqb.dqb_itime = 0;
557 clear_bit(DQ_INODES_B, &dquot->dq_flags);
559 /* All information is properly updated, clear the flags */
560 __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
561 __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
562 __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
563 __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
564 __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
565 __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
566 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
567 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
568 spin_unlock(&dquot->dq_dqb_lock);
569 err = ocfs2_qinfo_lock(info, freeing);
571 mlog(ML_ERROR, "Failed to lock quota info, losing quota write"
572 " (type=%d, id=%u)\n", dquot->dq_id.type,
573 (unsigned)from_kqid(&init_user_ns, dquot->dq_id));
577 OCFS2_DQUOT(dquot)->dq_use_count--;
578 err = qtree_write_dquot(&info->dqi_gi, dquot);
581 if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
582 err = qtree_release_dquot(&info->dqi_gi, dquot);
583 if (info_dirty(sb_dqinfo(sb, type))) {
584 err2 = __ocfs2_global_write_info(sb, type);
590 ocfs2_qinfo_unlock(info, freeing);
598 * Functions for periodic syncing of dquots with global file
600 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
603 struct super_block *sb = dquot->dq_sb;
604 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
605 struct ocfs2_super *osb = OCFS2_SB(sb);
607 unsigned int memalloc;
609 trace_ocfs2_sync_dquot_helper(from_kqid(&init_user_ns, dquot->dq_id),
612 if (type != dquot->dq_id.type)
614 status = ocfs2_lock_global_qf(oinfo, 1);
618 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
619 if (IS_ERR(handle)) {
620 status = PTR_ERR(handle);
624 down_write(&sb_dqopt(sb)->dqio_sem);
625 memalloc = memalloc_nofs_save();
626 status = ocfs2_sync_dquot(dquot);
629 /* We have to write local structure as well... */
630 status = ocfs2_local_write_dquot(dquot);
633 memalloc_nofs_restore(memalloc);
634 up_write(&sb_dqopt(sb)->dqio_sem);
635 ocfs2_commit_trans(osb, handle);
637 ocfs2_unlock_global_qf(oinfo, 1);
642 static void qsync_work_fn(struct work_struct *work)
644 struct ocfs2_mem_dqinfo *oinfo = container_of(work,
645 struct ocfs2_mem_dqinfo,
647 struct super_block *sb = oinfo->dqi_gqinode->i_sb;
650 * We have to be careful here not to deadlock on s_umount as umount
651 * disabling quotas may be in progress and it waits for this work to
652 * complete. If trylock fails, we'll do the sync next time...
654 if (down_read_trylock(&sb->s_umount)) {
655 dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
656 up_read(&sb->s_umount);
658 schedule_delayed_work(&oinfo->dqi_sync_work,
659 msecs_to_jiffies(oinfo->dqi_syncms));
663 * Wrappers for generic quota functions
666 static int ocfs2_write_dquot(struct dquot *dquot)
669 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
671 unsigned int memalloc;
673 trace_ocfs2_write_dquot(from_kqid(&init_user_ns, dquot->dq_id),
676 handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
677 if (IS_ERR(handle)) {
678 status = PTR_ERR(handle);
682 down_write(&sb_dqopt(dquot->dq_sb)->dqio_sem);
683 memalloc = memalloc_nofs_save();
684 status = ocfs2_local_write_dquot(dquot);
685 memalloc_nofs_restore(memalloc);
686 up_write(&sb_dqopt(dquot->dq_sb)->dqio_sem);
687 ocfs2_commit_trans(osb, handle);
692 static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
694 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
696 * We modify tree, leaf block, global info, local chunk header,
697 * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
698 * accounts for inode update
700 return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
701 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
702 OCFS2_QINFO_WRITE_CREDITS +
703 OCFS2_INODE_UPDATE_CREDITS;
706 void ocfs2_drop_dquot_refs(struct work_struct *work)
708 struct ocfs2_super *osb = container_of(work, struct ocfs2_super,
710 struct llist_node *list;
711 struct ocfs2_dquot *odquot, *next_odquot;
713 list = llist_del_all(&osb->dquot_drop_list);
714 llist_for_each_entry_safe(odquot, next_odquot, list, list) {
715 /* Drop the reference we acquired in ocfs2_dquot_release() */
716 dqput(&odquot->dq_dquot);
721 * Called when the last reference to dquot is dropped. If we are called from
722 * downconvert thread, we cannot do all the handling here because grabbing
723 * quota lock could deadlock (the node holding the quota lock could need some
724 * other cluster lock to proceed but with blocked downconvert thread we cannot
727 static int ocfs2_release_dquot(struct dquot *dquot)
730 struct ocfs2_mem_dqinfo *oinfo =
731 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
732 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
735 trace_ocfs2_release_dquot(from_kqid(&init_user_ns, dquot->dq_id),
738 mutex_lock(&dquot->dq_lock);
739 /* Check whether we are not racing with some other dqget() */
740 if (dquot_is_busy(dquot))
742 /* Running from downconvert thread? Postpone quota processing to wq */
743 if (current == osb->dc_task) {
745 * Grab our own reference to dquot and queue it for delayed
746 * dropping. Quota code rechecks after calling
747 * ->release_dquot() and won't free dquot structure.
750 /* First entry on list -> queue work */
751 if (llist_add(&OCFS2_DQUOT(dquot)->list, &osb->dquot_drop_list))
752 queue_work(osb->ocfs2_wq, &osb->dquot_drop_work);
755 status = ocfs2_lock_global_qf(oinfo, 1);
758 handle = ocfs2_start_trans(osb,
759 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_id.type));
760 if (IS_ERR(handle)) {
761 status = PTR_ERR(handle);
766 status = ocfs2_global_release_dquot(dquot);
771 status = ocfs2_local_release_dquot(handle, dquot);
773 * If we fail here, we cannot do much as global structure is
774 * already released. So just complain...
779 * Clear dq_off so that we search for the structure in quota file next
780 * time we acquire it. The structure might be deleted and reallocated
781 * elsewhere by another node while our dquot structure is on freelist.
784 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
786 ocfs2_commit_trans(osb, handle);
788 ocfs2_unlock_global_qf(oinfo, 1);
790 mutex_unlock(&dquot->dq_lock);
797 * Read global dquot structure from disk or create it if it does
798 * not exist. Also update use count of the global structure and
799 * create structure in node-local quota file.
801 static int ocfs2_acquire_dquot(struct dquot *dquot)
805 struct super_block *sb = dquot->dq_sb;
806 struct ocfs2_super *osb = OCFS2_SB(sb);
807 int type = dquot->dq_id.type;
808 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
809 struct inode *gqinode = info->dqi_gqinode;
810 int need_alloc = ocfs2_global_qinit_alloc(sb, type);
813 trace_ocfs2_acquire_dquot(from_kqid(&init_user_ns, dquot->dq_id),
815 mutex_lock(&dquot->dq_lock);
817 * We need an exclusive lock, because we're going to update use count
818 * and instantiate possibly new dquot structure
820 status = ocfs2_lock_global_qf(info, 1);
823 status = ocfs2_qinfo_lock(info, 0);
827 * We always want to read dquot structure from disk because we don't
828 * know what happened with it while it was on freelist.
830 status = qtree_read_dquot(&info->dqi_gi, dquot);
831 ocfs2_qinfo_unlock(info, 0);
835 OCFS2_DQUOT(dquot)->dq_use_count++;
836 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
837 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
838 if (!dquot->dq_off) { /* No real quota entry? */
841 * Add blocks to quota file before we start a transaction since
842 * locking allocators ranks above a transaction start
844 WARN_ON(journal_current_handle());
845 status = ocfs2_extend_no_holes(gqinode, NULL,
846 i_size_read(gqinode) + (need_alloc << sb->s_blocksize_bits),
847 i_size_read(gqinode));
852 handle = ocfs2_start_trans(osb,
853 ocfs2_calc_global_qinit_credits(sb, type));
854 if (IS_ERR(handle)) {
855 status = PTR_ERR(handle);
858 status = ocfs2_qinfo_lock(info, ex);
861 status = qtree_write_dquot(&info->dqi_gi, dquot);
862 if (ex && info_dirty(sb_dqinfo(sb, type))) {
863 err = __ocfs2_global_write_info(sb, type);
867 ocfs2_qinfo_unlock(info, ex);
869 ocfs2_commit_trans(osb, handle);
871 ocfs2_unlock_global_qf(info, 1);
875 status = ocfs2_create_local_dquot(dquot);
878 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
880 mutex_unlock(&dquot->dq_lock);
886 static int ocfs2_get_next_id(struct super_block *sb, struct kqid *qid)
888 int type = qid->type;
889 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
892 trace_ocfs2_get_next_id(from_kqid(&init_user_ns, *qid), type);
893 if (!sb_has_quota_loaded(sb, type)) {
897 status = ocfs2_lock_global_qf(info, 0);
900 status = ocfs2_qinfo_lock(info, 0);
903 status = qtree_get_next_id(&info->dqi_gi, qid);
904 ocfs2_qinfo_unlock(info, 0);
906 ocfs2_unlock_global_qf(info, 0);
909 * Avoid logging ENOENT since it just means there isn't next ID and
910 * ESRCH which means quota isn't enabled for the filesystem.
912 if (status && status != -ENOENT && status != -ESRCH)
917 static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
919 unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
920 (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
921 (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
922 (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
923 (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
924 (1 << (DQ_LASTSET_B + QIF_ITIME_B));
927 struct super_block *sb = dquot->dq_sb;
928 int type = dquot->dq_id.type;
929 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
931 struct ocfs2_super *osb = OCFS2_SB(sb);
932 unsigned int memalloc;
934 trace_ocfs2_mark_dquot_dirty(from_kqid(&init_user_ns, dquot->dq_id),
937 /* In case user set some limits, sync dquot immediately to global
938 * quota file so that information propagates quicker */
939 spin_lock(&dquot->dq_dqb_lock);
940 if (dquot->dq_flags & mask)
942 spin_unlock(&dquot->dq_dqb_lock);
943 /* This is a slight hack but we can't afford getting global quota
944 * lock if we already have a transaction started. */
945 if (!sync || journal_current_handle()) {
946 status = ocfs2_write_dquot(dquot);
949 status = ocfs2_lock_global_qf(oinfo, 1);
952 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
953 if (IS_ERR(handle)) {
954 status = PTR_ERR(handle);
958 down_write(&sb_dqopt(sb)->dqio_sem);
959 memalloc = memalloc_nofs_save();
960 status = ocfs2_sync_dquot(dquot);
965 /* Now write updated local dquot structure */
966 status = ocfs2_local_write_dquot(dquot);
968 memalloc_nofs_restore(memalloc);
969 up_write(&sb_dqopt(sb)->dqio_sem);
970 ocfs2_commit_trans(osb, handle);
972 ocfs2_unlock_global_qf(oinfo, 1);
979 /* This should happen only after set_dqinfo(). */
980 static int ocfs2_write_info(struct super_block *sb, int type)
984 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
986 status = ocfs2_lock_global_qf(oinfo, 1);
989 handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
990 if (IS_ERR(handle)) {
991 status = PTR_ERR(handle);
995 status = dquot_commit_info(sb, type);
996 ocfs2_commit_trans(OCFS2_SB(sb), handle);
998 ocfs2_unlock_global_qf(oinfo, 1);
1005 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
1007 struct ocfs2_dquot *dquot =
1008 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
1012 return &dquot->dq_dquot;
1015 static void ocfs2_destroy_dquot(struct dquot *dquot)
1017 kmem_cache_free(ocfs2_dquot_cachep, dquot);
1020 const struct dquot_operations ocfs2_quota_operations = {
1021 /* We never make dquot dirty so .write_dquot is never called */
1022 .acquire_dquot = ocfs2_acquire_dquot,
1023 .release_dquot = ocfs2_release_dquot,
1024 .mark_dirty = ocfs2_mark_dquot_dirty,
1025 .write_info = ocfs2_write_info,
1026 .alloc_dquot = ocfs2_alloc_dquot,
1027 .destroy_dquot = ocfs2_destroy_dquot,
1028 .get_next_id = ocfs2_get_next_id,