1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2003 Silicon Graphics, Inc.
8 #include "xfs_format.h"
9 #include "xfs_log_format.h"
10 #include "xfs_shared.h"
11 #include "xfs_trans_resv.h"
13 #include "xfs_mount.h"
14 #include "xfs_defer.h"
15 #include "xfs_inode.h"
17 #include "xfs_quota.h"
18 #include "xfs_trans.h"
19 #include "xfs_buf_item.h"
20 #include "xfs_trans_space.h"
21 #include "xfs_trans_priv.h"
23 #include "xfs_trace.h"
25 #include "xfs_bmap_btree.h"
26 #include "xfs_error.h"
33 * dquot->q_qlock (xfs_dqlock() and friends)
34 * dquot->q_flush (xfs_dqflock() and friends)
37 * If two dquots need to be locked the order is user before group/project,
38 * otherwise by the lowest id first, see xfs_dqlock2.
41 struct kmem_zone *xfs_qm_dqtrxzone;
42 static struct kmem_zone *xfs_qm_dqzone;
44 static struct lock_class_key xfs_dquot_group_class;
45 static struct lock_class_key xfs_dquot_project_class;
48 * This is called to free all the memory associated with a dquot
52 struct xfs_dquot *dqp)
54 ASSERT(list_empty(&dqp->q_lru));
56 kmem_free(dqp->q_logitem.qli_item.li_lv_shadow);
57 mutex_destroy(&dqp->q_qlock);
59 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot);
60 kmem_cache_free(xfs_qm_dqzone, dqp);
64 * If default limits are in force, push them into the dquot now.
65 * We overwrite the dquot limits only if they are zero and this
66 * is not the root dquot.
69 xfs_qm_adjust_dqlimits(
72 struct xfs_mount *mp = dq->q_mount;
73 struct xfs_quotainfo *q = mp->m_quotainfo;
74 struct xfs_def_quota *defq;
78 defq = xfs_get_defquota(q, xfs_dquot_type(dq));
80 if (!dq->q_blk.softlimit) {
81 dq->q_blk.softlimit = defq->blk.soft;
84 if (!dq->q_blk.hardlimit) {
85 dq->q_blk.hardlimit = defq->blk.hard;
88 if (!dq->q_ino.softlimit)
89 dq->q_ino.softlimit = defq->ino.soft;
90 if (!dq->q_ino.hardlimit)
91 dq->q_ino.hardlimit = defq->ino.hard;
92 if (!dq->q_rtb.softlimit)
93 dq->q_rtb.softlimit = defq->rtb.soft;
94 if (!dq->q_rtb.hardlimit)
95 dq->q_rtb.hardlimit = defq->rtb.hard;
98 xfs_dquot_set_prealloc_limits(dq);
102 * Determine if this quota counter is over either limit and set the quota
103 * timers as appropriate.
106 xfs_qm_adjust_res_timer(
107 struct xfs_dquot_res *res,
108 struct xfs_quota_limits *qlim)
110 ASSERT(res->hardlimit == 0 || res->softlimit <= res->hardlimit);
112 if ((res->softlimit && res->count > res->softlimit) ||
113 (res->hardlimit && res->count > res->hardlimit)) {
115 res->timer = ktime_get_real_seconds() + qlim->time;
125 * Check the limits and timers of a dquot and start or reset timers
127 * This gets called even when quota enforcement is OFF, which makes our
128 * life a little less complicated. (We just don't reject any quota
129 * reservations in that case, when enforcement is off).
130 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when
132 * In contrast, warnings are a little different in that they don't
133 * 'automatically' get started when limits get exceeded. They do
134 * get reset to zero, however, when we find the count to be under
135 * the soft limit (they are only ever set non-zero via userspace).
138 xfs_qm_adjust_dqtimers(
139 struct xfs_dquot *dq)
141 struct xfs_mount *mp = dq->q_mount;
142 struct xfs_quotainfo *qi = mp->m_quotainfo;
143 struct xfs_def_quota *defq;
146 defq = xfs_get_defquota(qi, xfs_dquot_type(dq));
148 xfs_qm_adjust_res_timer(&dq->q_blk, &defq->blk);
149 xfs_qm_adjust_res_timer(&dq->q_ino, &defq->ino);
150 xfs_qm_adjust_res_timer(&dq->q_rtb, &defq->rtb);
154 * initialize a buffer full of dquots and log the whole thing
157 xfs_qm_init_dquot_blk(
158 struct xfs_trans *tp,
159 struct xfs_mount *mp,
164 struct xfs_quotainfo *q = mp->m_quotainfo;
168 unsigned int blftype;
172 ASSERT(xfs_buf_islocked(bp));
175 case XFS_DQTYPE_USER:
176 qflag = XFS_UQUOTA_CHKD;
177 blftype = XFS_BLF_UDQUOT_BUF;
179 case XFS_DQTYPE_PROJ:
180 qflag = XFS_PQUOTA_CHKD;
181 blftype = XFS_BLF_PDQUOT_BUF;
183 case XFS_DQTYPE_GROUP:
184 qflag = XFS_GQUOTA_CHKD;
185 blftype = XFS_BLF_GDQUOT_BUF;
195 * ID of the first dquot in the block - id's are zero based.
197 curid = id - (id % q->qi_dqperchunk);
198 memset(d, 0, BBTOB(q->qi_dqchunklen));
199 for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++) {
200 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
201 d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
202 d->dd_diskdq.d_id = cpu_to_be32(curid);
203 d->dd_diskdq.d_type = type;
204 if (xfs_sb_version_hascrc(&mp->m_sb)) {
205 uuid_copy(&d->dd_uuid, &mp->m_sb.sb_meta_uuid);
206 xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk),
211 xfs_trans_dquot_buf(tp, bp, blftype);
214 * quotacheck uses delayed writes to update all the dquots on disk in an
215 * efficient manner instead of logging the individual dquot changes as
216 * they are made. However if we log the buffer allocated here and crash
217 * after quotacheck while the logged initialisation is still in the
218 * active region of the log, log recovery can replay the dquot buffer
219 * initialisation over the top of the checked dquots and corrupt quota
222 * To avoid this problem, quotacheck cannot log the initialised buffer.
223 * We must still dirty the buffer and write it back before the
224 * allocation transaction clears the log. Therefore, mark the buffer as
225 * ordered instead of logging it directly. This is safe for quotacheck
226 * because it detects and repairs allocated but initialized dquot blocks
227 * in the quota inodes.
229 if (!(mp->m_qflags & qflag))
230 xfs_trans_ordered_buf(tp, bp);
232 xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1);
236 * Initialize the dynamic speculative preallocation thresholds. The lo/hi
237 * watermarks correspond to the soft and hard limits by default. If a soft limit
238 * is not specified, we use 95% of the hard limit.
241 xfs_dquot_set_prealloc_limits(struct xfs_dquot *dqp)
245 dqp->q_prealloc_hi_wmark = dqp->q_blk.hardlimit;
246 dqp->q_prealloc_lo_wmark = dqp->q_blk.softlimit;
247 if (!dqp->q_prealloc_lo_wmark) {
248 dqp->q_prealloc_lo_wmark = dqp->q_prealloc_hi_wmark;
249 do_div(dqp->q_prealloc_lo_wmark, 100);
250 dqp->q_prealloc_lo_wmark *= 95;
253 space = dqp->q_prealloc_hi_wmark;
256 dqp->q_low_space[XFS_QLOWSP_1_PCNT] = space;
257 dqp->q_low_space[XFS_QLOWSP_3_PCNT] = space * 3;
258 dqp->q_low_space[XFS_QLOWSP_5_PCNT] = space * 5;
262 * Ensure that the given in-core dquot has a buffer on disk backing it, and
263 * return the buffer locked and held. This is called when the bmapi finds a
267 xfs_dquot_disk_alloc(
268 struct xfs_trans **tpp,
269 struct xfs_dquot *dqp,
270 struct xfs_buf **bpp)
272 struct xfs_bmbt_irec map;
273 struct xfs_trans *tp = *tpp;
274 struct xfs_mount *mp = tp->t_mountp;
276 xfs_dqtype_t qtype = xfs_dquot_type(dqp);
277 struct xfs_inode *quotip = xfs_quota_inode(mp, qtype);
281 trace_xfs_dqalloc(dqp);
283 xfs_ilock(quotip, XFS_ILOCK_EXCL);
284 if (!xfs_this_quota_on(dqp->q_mount, qtype)) {
286 * Return if this type of quotas is turned off while we didn't
289 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
293 /* Create the block mapping. */
294 xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL);
295 error = xfs_bmapi_write(tp, quotip, dqp->q_fileoffset,
296 XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA, 0, &map,
300 ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
302 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
303 (map.br_startblock != HOLESTARTBLOCK));
306 * Keep track of the blkno to save a lookup later
308 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
310 /* now we can just get the buffer (there's nothing to read yet) */
311 error = xfs_trans_get_buf(tp, mp->m_ddev_targp, dqp->q_blkno,
312 mp->m_quotainfo->qi_dqchunklen, 0, &bp);
315 bp->b_ops = &xfs_dquot_buf_ops;
318 * Make a chunk of dquots out of this buffer and log
321 xfs_qm_init_dquot_blk(tp, mp, dqp->q_id, qtype, bp);
322 xfs_buf_set_ref(bp, XFS_DQUOT_REF);
325 * Hold the buffer and join it to the dfops so that we'll still own
326 * the buffer when we return to the caller. The buffer disposal on
327 * error must be paid attention to very carefully, as it has been
328 * broken since commit efa092f3d4c6 "[XFS] Fixes a bug in the quota
329 * code when allocating a new dquot record" in 2005, and the later
330 * conversion to xfs_defer_ops in commit 310a75a3c6c747 failed to keep
331 * the buffer locked across the _defer_finish call. We can now do
332 * this correctly with xfs_defer_bjoin.
334 * Above, we allocated a disk block for the dquot information and used
335 * get_buf to initialize the dquot. If the _defer_finish fails, the old
336 * transaction is gone but the new buffer is not joined or held to any
337 * transaction, so we must _buf_relse it.
339 * If everything succeeds, the caller of this function is returned a
340 * buffer that is locked and held to the transaction. The caller
341 * is responsible for unlocking any buffer passed back, either
342 * manually or by committing the transaction. On error, the buffer is
343 * released and not passed back.
345 xfs_trans_bhold(tp, bp);
346 error = xfs_defer_finish(tpp);
348 xfs_trans_bhold_release(*tpp, bp);
349 xfs_trans_brelse(*tpp, bp);
357 * Read in the in-core dquot's on-disk metadata and return the buffer.
358 * Returns ENOENT to signal a hole.
362 struct xfs_mount *mp,
363 struct xfs_dquot *dqp,
364 struct xfs_buf **bpp)
366 struct xfs_bmbt_irec map;
368 xfs_dqtype_t qtype = xfs_dquot_type(dqp);
369 struct xfs_inode *quotip = xfs_quota_inode(mp, qtype);
374 lock_mode = xfs_ilock_data_map_shared(quotip);
375 if (!xfs_this_quota_on(mp, qtype)) {
377 * Return if this type of quotas is turned off while we
378 * didn't have the quota inode lock.
380 xfs_iunlock(quotip, lock_mode);
385 * Find the block map; no allocations yet
387 error = xfs_bmapi_read(quotip, dqp->q_fileoffset,
388 XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0);
389 xfs_iunlock(quotip, lock_mode);
394 ASSERT(map.br_blockcount >= 1);
395 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
396 if (map.br_startblock == HOLESTARTBLOCK)
399 trace_xfs_dqtobp_read(dqp);
402 * store the blkno etc so that we don't have to do the
403 * mapping all the time
405 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
407 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
408 mp->m_quotainfo->qi_dqchunklen, 0, &bp,
415 ASSERT(xfs_buf_islocked(bp));
416 xfs_buf_set_ref(bp, XFS_DQUOT_REF);
422 /* Allocate and initialize everything we need for an incore dquot. */
423 STATIC struct xfs_dquot *
425 struct xfs_mount *mp,
429 struct xfs_dquot *dqp;
431 dqp = kmem_cache_zalloc(xfs_qm_dqzone, GFP_KERNEL | __GFP_NOFAIL);
436 INIT_LIST_HEAD(&dqp->q_lru);
437 mutex_init(&dqp->q_qlock);
438 init_waitqueue_head(&dqp->q_pinwait);
439 dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;
441 * Offset of dquot in the (fixed sized) dquot chunk.
443 dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) *
447 * Because we want to use a counting completion, complete
448 * the flush completion once to allow a single access to
449 * the flush completion without blocking.
451 init_completion(&dqp->q_flush);
452 complete(&dqp->q_flush);
455 * Make sure group quotas have a different lock class than user
459 case XFS_DQTYPE_USER:
460 /* uses the default lock class */
462 case XFS_DQTYPE_GROUP:
463 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_group_class);
465 case XFS_DQTYPE_PROJ:
466 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_project_class);
473 xfs_qm_dquot_logitem_init(dqp);
475 XFS_STATS_INC(mp, xs_qm_dquot);
479 /* Copy the in-core quota fields in from the on-disk buffer. */
482 struct xfs_dquot *dqp,
485 struct xfs_disk_dquot *ddqp = bp->b_addr + dqp->q_bufoffset;
488 * Ensure that we got the type and ID we were looking for.
489 * Everything else was checked by the dquot buffer verifier.
491 if ((ddqp->d_type & XFS_DQTYPE_REC_MASK) != xfs_dquot_type(dqp) ||
492 be32_to_cpu(ddqp->d_id) != dqp->q_id) {
493 xfs_alert_tag(bp->b_mount, XFS_PTAG_VERIFIER_ERROR,
494 "Metadata corruption detected at %pS, quota %u",
495 __this_address, dqp->q_id);
496 xfs_alert(bp->b_mount, "Unmount and run xfs_repair");
497 return -EFSCORRUPTED;
500 /* copy everything from disk dquot to the incore dquot */
501 dqp->q_type = ddqp->d_type;
502 dqp->q_blk.hardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
503 dqp->q_blk.softlimit = be64_to_cpu(ddqp->d_blk_softlimit);
504 dqp->q_ino.hardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
505 dqp->q_ino.softlimit = be64_to_cpu(ddqp->d_ino_softlimit);
506 dqp->q_rtb.hardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
507 dqp->q_rtb.softlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
509 dqp->q_blk.count = be64_to_cpu(ddqp->d_bcount);
510 dqp->q_ino.count = be64_to_cpu(ddqp->d_icount);
511 dqp->q_rtb.count = be64_to_cpu(ddqp->d_rtbcount);
513 dqp->q_blk.warnings = be16_to_cpu(ddqp->d_bwarns);
514 dqp->q_ino.warnings = be16_to_cpu(ddqp->d_iwarns);
515 dqp->q_rtb.warnings = be16_to_cpu(ddqp->d_rtbwarns);
517 dqp->q_blk.timer = be32_to_cpu(ddqp->d_btimer);
518 dqp->q_ino.timer = be32_to_cpu(ddqp->d_itimer);
519 dqp->q_rtb.timer = be32_to_cpu(ddqp->d_rtbtimer);
522 * Reservation counters are defined as reservation plus current usage
523 * to avoid having to add every time.
525 dqp->q_blk.reserved = dqp->q_blk.count;
526 dqp->q_ino.reserved = dqp->q_ino.count;
527 dqp->q_rtb.reserved = dqp->q_rtb.count;
529 /* initialize the dquot speculative prealloc thresholds */
530 xfs_dquot_set_prealloc_limits(dqp);
534 /* Copy the in-core quota fields into the on-disk buffer. */
537 struct xfs_disk_dquot *ddqp,
538 struct xfs_dquot *dqp)
540 ddqp->d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
541 ddqp->d_version = XFS_DQUOT_VERSION;
542 ddqp->d_type = dqp->q_type;
543 ddqp->d_id = cpu_to_be32(dqp->q_id);
547 ddqp->d_blk_hardlimit = cpu_to_be64(dqp->q_blk.hardlimit);
548 ddqp->d_blk_softlimit = cpu_to_be64(dqp->q_blk.softlimit);
549 ddqp->d_ino_hardlimit = cpu_to_be64(dqp->q_ino.hardlimit);
550 ddqp->d_ino_softlimit = cpu_to_be64(dqp->q_ino.softlimit);
551 ddqp->d_rtb_hardlimit = cpu_to_be64(dqp->q_rtb.hardlimit);
552 ddqp->d_rtb_softlimit = cpu_to_be64(dqp->q_rtb.softlimit);
554 ddqp->d_bcount = cpu_to_be64(dqp->q_blk.count);
555 ddqp->d_icount = cpu_to_be64(dqp->q_ino.count);
556 ddqp->d_rtbcount = cpu_to_be64(dqp->q_rtb.count);
558 ddqp->d_bwarns = cpu_to_be16(dqp->q_blk.warnings);
559 ddqp->d_iwarns = cpu_to_be16(dqp->q_ino.warnings);
560 ddqp->d_rtbwarns = cpu_to_be16(dqp->q_rtb.warnings);
562 ddqp->d_btimer = cpu_to_be32(dqp->q_blk.timer);
563 ddqp->d_itimer = cpu_to_be32(dqp->q_ino.timer);
564 ddqp->d_rtbtimer = cpu_to_be32(dqp->q_rtb.timer);
567 /* Allocate and initialize the dquot buffer for this in-core dquot. */
570 struct xfs_mount *mp,
571 struct xfs_dquot *dqp,
572 struct xfs_buf **bpp)
574 struct xfs_trans *tp;
577 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_dqalloc,
578 XFS_QM_DQALLOC_SPACE_RES(mp), 0, 0, &tp);
582 error = xfs_dquot_disk_alloc(&tp, dqp, bpp);
586 error = xfs_trans_commit(tp);
589 * Buffer was held to the transaction, so we have to unlock it
590 * manually here because we're not passing it back.
599 xfs_trans_cancel(tp);
605 * Read in the ondisk dquot using dqtobp() then copy it to an incore version,
606 * and release the buffer immediately. If @can_alloc is true, fill any
607 * holes in the on-disk metadata.
611 struct xfs_mount *mp,
615 struct xfs_dquot **dqpp)
617 struct xfs_dquot *dqp;
621 dqp = xfs_dquot_alloc(mp, id, type);
622 trace_xfs_dqread(dqp);
624 /* Try to read the buffer, allocating if necessary. */
625 error = xfs_dquot_disk_read(mp, dqp, &bp);
626 if (error == -ENOENT && can_alloc)
627 error = xfs_qm_dqread_alloc(mp, dqp, &bp);
632 * At this point we should have a clean locked buffer. Copy the data
633 * to the incore dquot and release the buffer since the incore dquot
634 * has its own locking protocol so we needn't tie up the buffer any
637 ASSERT(xfs_buf_islocked(bp));
638 error = xfs_dquot_from_disk(dqp, bp);
647 trace_xfs_dqread_fail(dqp);
648 xfs_qm_dqdestroy(dqp);
654 * Advance to the next id in the current chunk, or if at the
655 * end of the chunk, skip ahead to first id in next allocated chunk
656 * using the SEEK_DATA interface.
660 struct xfs_mount *mp,
664 struct xfs_inode *quotip = xfs_quota_inode(mp, type);
665 xfs_dqid_t next_id = *id + 1; /* simple advance */
667 struct xfs_bmbt_irec got;
668 struct xfs_iext_cursor cur;
672 /* If we'd wrap past the max ID, stop */
676 /* If new ID is within the current chunk, advancing it sufficed */
677 if (next_id % mp->m_quotainfo->qi_dqperchunk) {
682 /* Nope, next_id is now past the current chunk, so find the next one */
683 start = (xfs_fsblock_t)next_id / mp->m_quotainfo->qi_dqperchunk;
685 lock_flags = xfs_ilock_data_map_shared(quotip);
686 if (!(quotip->i_df.if_flags & XFS_IFEXTENTS)) {
687 error = xfs_iread_extents(NULL, quotip, XFS_DATA_FORK);
692 if (xfs_iext_lookup_extent(quotip, "ip->i_df, start, &cur, &got)) {
693 /* contiguous chunk, bump startoff for the id calculation */
694 if (got.br_startoff < start)
695 got.br_startoff = start;
696 *id = got.br_startoff * mp->m_quotainfo->qi_dqperchunk;
701 xfs_iunlock(quotip, lock_flags);
707 * Look up the dquot in the in-core cache. If found, the dquot is returned
708 * locked and ready to go.
710 static struct xfs_dquot *
711 xfs_qm_dqget_cache_lookup(
712 struct xfs_mount *mp,
713 struct xfs_quotainfo *qi,
714 struct radix_tree_root *tree,
717 struct xfs_dquot *dqp;
720 mutex_lock(&qi->qi_tree_lock);
721 dqp = radix_tree_lookup(tree, id);
723 mutex_unlock(&qi->qi_tree_lock);
724 XFS_STATS_INC(mp, xs_qm_dqcachemisses);
729 if (dqp->q_flags & XFS_DQFLAG_FREEING) {
731 mutex_unlock(&qi->qi_tree_lock);
732 trace_xfs_dqget_freeing(dqp);
738 mutex_unlock(&qi->qi_tree_lock);
740 trace_xfs_dqget_hit(dqp);
741 XFS_STATS_INC(mp, xs_qm_dqcachehits);
746 * Try to insert a new dquot into the in-core cache. If an error occurs the
747 * caller should throw away the dquot and start over. Otherwise, the dquot
748 * is returned locked (and held by the cache) as if there had been a cache
752 xfs_qm_dqget_cache_insert(
753 struct xfs_mount *mp,
754 struct xfs_quotainfo *qi,
755 struct radix_tree_root *tree,
757 struct xfs_dquot *dqp)
761 mutex_lock(&qi->qi_tree_lock);
762 error = radix_tree_insert(tree, id, dqp);
763 if (unlikely(error)) {
764 /* Duplicate found! Caller must try again. */
765 WARN_ON(error != -EEXIST);
766 mutex_unlock(&qi->qi_tree_lock);
767 trace_xfs_dqget_dup(dqp);
771 /* Return a locked dquot to the caller, with a reference taken. */
776 mutex_unlock(&qi->qi_tree_lock);
781 /* Check our input parameters. */
784 struct xfs_mount *mp,
787 if (WARN_ON_ONCE(!XFS_IS_QUOTA_RUNNING(mp)))
791 case XFS_DQTYPE_USER:
792 if (!XFS_IS_UQUOTA_ON(mp))
795 case XFS_DQTYPE_GROUP:
796 if (!XFS_IS_GQUOTA_ON(mp))
799 case XFS_DQTYPE_PROJ:
800 if (!XFS_IS_PQUOTA_ON(mp))
810 * Given the file system, id, and type (UDQUOT/GDQUOT), return a locked
811 * dquot, doing an allocation (if requested) as needed.
815 struct xfs_mount *mp,
819 struct xfs_dquot **O_dqpp)
821 struct xfs_quotainfo *qi = mp->m_quotainfo;
822 struct radix_tree_root *tree = xfs_dquot_tree(qi, type);
823 struct xfs_dquot *dqp;
826 error = xfs_qm_dqget_checks(mp, type);
831 dqp = xfs_qm_dqget_cache_lookup(mp, qi, tree, id);
837 error = xfs_qm_dqread(mp, id, type, can_alloc, &dqp);
841 error = xfs_qm_dqget_cache_insert(mp, qi, tree, id, dqp);
844 * Duplicate found. Just throw away the new dquot and start
847 xfs_qm_dqdestroy(dqp);
848 XFS_STATS_INC(mp, xs_qm_dquot_dups);
852 trace_xfs_dqget_miss(dqp);
858 * Given a dquot id and type, read and initialize a dquot from the on-disk
859 * metadata. This function is only for use during quota initialization so
860 * it ignores the dquot cache assuming that the dquot shrinker isn't set up.
861 * The caller is responsible for _qm_dqdestroy'ing the returned dquot.
864 xfs_qm_dqget_uncached(
865 struct xfs_mount *mp,
868 struct xfs_dquot **dqpp)
872 error = xfs_qm_dqget_checks(mp, type);
876 return xfs_qm_dqread(mp, id, type, 0, dqpp);
879 /* Return the quota id for a given inode and type. */
881 xfs_qm_id_for_quotatype(
882 struct xfs_inode *ip,
886 case XFS_DQTYPE_USER:
887 return i_uid_read(VFS_I(ip));
888 case XFS_DQTYPE_GROUP:
889 return i_gid_read(VFS_I(ip));
890 case XFS_DQTYPE_PROJ:
891 return ip->i_d.di_projid;
898 * Return the dquot for a given inode and type. If @can_alloc is true, then
899 * allocate blocks if needed. The inode's ILOCK must be held and it must not
900 * have already had an inode attached.
904 struct xfs_inode *ip,
907 struct xfs_dquot **O_dqpp)
909 struct xfs_mount *mp = ip->i_mount;
910 struct xfs_quotainfo *qi = mp->m_quotainfo;
911 struct radix_tree_root *tree = xfs_dquot_tree(qi, type);
912 struct xfs_dquot *dqp;
916 error = xfs_qm_dqget_checks(mp, type);
920 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
921 ASSERT(xfs_inode_dquot(ip, type) == NULL);
923 id = xfs_qm_id_for_quotatype(ip, type);
926 dqp = xfs_qm_dqget_cache_lookup(mp, qi, tree, id);
933 * Dquot cache miss. We don't want to keep the inode lock across
934 * a (potential) disk read. Also we don't want to deal with the lock
935 * ordering between quotainode and this inode. OTOH, dropping the inode
936 * lock here means dealing with a chown that can happen before
937 * we re-acquire the lock.
939 xfs_iunlock(ip, XFS_ILOCK_EXCL);
940 error = xfs_qm_dqread(mp, id, type, can_alloc, &dqp);
941 xfs_ilock(ip, XFS_ILOCK_EXCL);
946 * A dquot could be attached to this inode by now, since we had
949 if (xfs_this_quota_on(mp, type)) {
950 struct xfs_dquot *dqp1;
952 dqp1 = xfs_inode_dquot(ip, type);
954 xfs_qm_dqdestroy(dqp);
960 /* inode stays locked on return */
961 xfs_qm_dqdestroy(dqp);
965 error = xfs_qm_dqget_cache_insert(mp, qi, tree, id, dqp);
968 * Duplicate found. Just throw away the new dquot and start
971 xfs_qm_dqdestroy(dqp);
972 XFS_STATS_INC(mp, xs_qm_dquot_dups);
977 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
978 trace_xfs_dqget_miss(dqp);
984 * Starting at @id and progressing upwards, look for an initialized incore
985 * dquot, lock it, and return it.
989 struct xfs_mount *mp,
992 struct xfs_dquot **dqpp)
994 struct xfs_dquot *dqp;
998 for (; !error; error = xfs_dq_get_next_id(mp, type, &id)) {
999 error = xfs_qm_dqget(mp, id, type, false, &dqp);
1000 if (error == -ENOENT)
1002 else if (error != 0)
1005 if (!XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
1017 * Release a reference to the dquot (decrement ref-count) and unlock it.
1019 * If there is a group quota attached to this dquot, carefully release that
1020 * too without tripping over deadlocks'n'stuff.
1024 struct xfs_dquot *dqp)
1026 ASSERT(dqp->q_nrefs > 0);
1027 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1029 trace_xfs_dqput(dqp);
1031 if (--dqp->q_nrefs == 0) {
1032 struct xfs_quotainfo *qi = dqp->q_mount->m_quotainfo;
1033 trace_xfs_dqput_free(dqp);
1035 if (list_lru_add(&qi->qi_lru, &dqp->q_lru))
1036 XFS_STATS_INC(dqp->q_mount, xs_qm_dquot_unused);
1042 * Release a dquot. Flush it if dirty, then dqput() it.
1043 * dquot must not be locked.
1047 struct xfs_dquot *dqp)
1052 trace_xfs_dqrele(dqp);
1056 * We don't care to flush it if the dquot is dirty here.
1057 * That will create stutters that we want to avoid.
1058 * Instead we do a delayed write when we try to reclaim
1059 * a dirty dquot. Also xfs_sync will take part of the burden...
1065 * This is the dquot flushing I/O completion routine. It is called
1066 * from interrupt level when the buffer containing the dquot is
1067 * flushed to disk. It is responsible for removing the dquot logitem
1068 * from the AIL if it has not been re-logged, and unlocking the dquot's
1069 * flush lock. This behavior is very similar to that of inodes..
1072 xfs_qm_dqflush_done(
1073 struct xfs_log_item *lip)
1075 struct xfs_dq_logitem *qip = (struct xfs_dq_logitem *)lip;
1076 struct xfs_dquot *dqp = qip->qli_dquot;
1077 struct xfs_ail *ailp = lip->li_ailp;
1081 * We only want to pull the item from the AIL if its
1082 * location in the log has not changed since we started the flush.
1083 * Thus, we only bother if the dquot's lsn has
1084 * not changed. First we check the lsn outside the lock
1085 * since it's cheaper, and then we recheck while
1086 * holding the lock before removing the dquot from the AIL.
1088 if (test_bit(XFS_LI_IN_AIL, &lip->li_flags) &&
1089 ((lip->li_lsn == qip->qli_flush_lsn) ||
1090 test_bit(XFS_LI_FAILED, &lip->li_flags))) {
1092 spin_lock(&ailp->ail_lock);
1093 xfs_clear_li_failed(lip);
1094 if (lip->li_lsn == qip->qli_flush_lsn) {
1095 /* xfs_ail_update_finish() drops the AIL lock */
1096 tail_lsn = xfs_ail_delete_one(ailp, lip);
1097 xfs_ail_update_finish(ailp, tail_lsn);
1099 spin_unlock(&ailp->ail_lock);
1104 * Release the dq's flush lock since we're done with it.
1113 struct xfs_log_item *lip, *n;
1115 list_for_each_entry_safe(lip, n, &bp->b_li_list, li_bio_list) {
1116 list_del_init(&lip->li_bio_list);
1117 xfs_qm_dqflush_done(lip);
1121 /* Check incore dquot for errors before we flush. */
1122 static xfs_failaddr_t
1123 xfs_qm_dqflush_check(
1124 struct xfs_dquot *dqp)
1126 xfs_dqtype_t type = xfs_dquot_type(dqp);
1128 if (type != XFS_DQTYPE_USER &&
1129 type != XFS_DQTYPE_GROUP &&
1130 type != XFS_DQTYPE_PROJ)
1131 return __this_address;
1136 if (dqp->q_blk.softlimit && dqp->q_blk.count > dqp->q_blk.softlimit &&
1138 return __this_address;
1140 if (dqp->q_ino.softlimit && dqp->q_ino.count > dqp->q_ino.softlimit &&
1142 return __this_address;
1144 if (dqp->q_rtb.softlimit && dqp->q_rtb.count > dqp->q_rtb.softlimit &&
1146 return __this_address;
1152 * Write a modified dquot to disk.
1153 * The dquot must be locked and the flush lock too taken by caller.
1154 * The flush lock will not be unlocked until the dquot reaches the disk,
1155 * but the dquot is free to be unlocked and modified by the caller
1156 * in the interim. Dquot is still locked on return. This behavior is
1157 * identical to that of inodes.
1161 struct xfs_dquot *dqp,
1162 struct xfs_buf **bpp)
1164 struct xfs_mount *mp = dqp->q_mount;
1165 struct xfs_log_item *lip = &dqp->q_logitem.qli_item;
1167 struct xfs_dqblk *dqblk;
1171 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1172 ASSERT(!completion_done(&dqp->q_flush));
1174 trace_xfs_dqflush(dqp);
1178 xfs_qm_dqunpin_wait(dqp);
1181 * Get the buffer containing the on-disk dquot
1183 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
1184 mp->m_quotainfo->qi_dqchunklen, XBF_TRYLOCK,
1185 &bp, &xfs_dquot_buf_ops);
1186 if (error == -EAGAIN)
1191 fa = xfs_qm_dqflush_check(dqp);
1193 xfs_alert(mp, "corrupt dquot ID 0x%x in memory at %pS",
1196 error = -EFSCORRUPTED;
1200 /* Flush the incore dquot to the ondisk buffer. */
1201 dqblk = bp->b_addr + dqp->q_bufoffset;
1202 xfs_dquot_to_disk(&dqblk->dd_diskdq, dqp);
1205 * Clear the dirty field and remember the flush lsn for later use.
1207 dqp->q_flags &= ~XFS_DQFLAG_DIRTY;
1209 xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn,
1210 &dqp->q_logitem.qli_item.li_lsn);
1213 * copy the lsn into the on-disk dquot now while we have the in memory
1214 * dquot here. This can't be done later in the write verifier as we
1215 * can't get access to the log item at that point in time.
1217 * We also calculate the CRC here so that the on-disk dquot in the
1218 * buffer always has a valid CRC. This ensures there is no possibility
1219 * of a dquot without an up-to-date CRC getting to disk.
1221 if (xfs_sb_version_hascrc(&mp->m_sb)) {
1222 dqblk->dd_lsn = cpu_to_be64(dqp->q_logitem.qli_item.li_lsn);
1223 xfs_update_cksum((char *)dqblk, sizeof(struct xfs_dqblk),
1228 * Attach the dquot to the buffer so that we can remove this dquot from
1229 * the AIL and release the flush lock once the dquot is synced to disk.
1231 bp->b_flags |= _XBF_DQUOTS;
1232 list_add_tail(&dqp->q_logitem.qli_item.li_bio_list, &bp->b_li_list);
1235 * If the buffer is pinned then push on the log so we won't
1236 * get stuck waiting in the write for too long.
1238 if (xfs_buf_ispinned(bp)) {
1239 trace_xfs_dqflush_force(dqp);
1240 xfs_log_force(mp, 0);
1243 trace_xfs_dqflush_done(dqp);
1248 dqp->q_flags &= ~XFS_DQFLAG_DIRTY;
1249 xfs_trans_ail_delete(lip, 0);
1250 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1257 * Lock two xfs_dquot structures.
1259 * To avoid deadlocks we always lock the quota structure with
1260 * the lowerd id first.
1264 struct xfs_dquot *d1,
1265 struct xfs_dquot *d2)
1269 if (d1->q_id > d2->q_id) {
1270 mutex_lock(&d2->q_qlock);
1271 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
1273 mutex_lock(&d1->q_qlock);
1274 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
1277 mutex_lock(&d1->q_qlock);
1279 mutex_lock(&d2->q_qlock);
1286 xfs_qm_dqzone = kmem_cache_create("xfs_dquot",
1287 sizeof(struct xfs_dquot),
1292 xfs_qm_dqtrxzone = kmem_cache_create("xfs_dqtrx",
1293 sizeof(struct xfs_dquot_acct),
1295 if (!xfs_qm_dqtrxzone)
1296 goto out_free_dqzone;
1301 kmem_cache_destroy(xfs_qm_dqzone);
1309 kmem_cache_destroy(xfs_qm_dqtrxzone);
1310 kmem_cache_destroy(xfs_qm_dqzone);
1314 * Iterate every dquot of a particular type. The caller must ensure that the
1315 * particular quota type is active. iter_fn can return negative error codes,
1316 * or -ECANCELED to indicate that it wants to stop iterating.
1320 struct xfs_mount *mp,
1322 xfs_qm_dqiterate_fn iter_fn,
1325 struct xfs_dquot *dq;
1330 error = xfs_qm_dqget_next(mp, id, type, &dq);
1331 if (error == -ENOENT)
1336 error = iter_fn(dq, type, priv);
1339 } while (error == 0 && id != 0);