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1/*
2 * Copyright (c) 2000-2003 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_bit.h"
21#include "xfs_log.h"
22#include "xfs_inum.h"
23#include "xfs_trans.h"
24#include "xfs_sb.h"
25#include "xfs_ag.h"
26#include "xfs_alloc.h"
27#include "xfs_quota.h"
28#include "xfs_mount.h"
29#include "xfs_bmap_btree.h"
30#include "xfs_inode.h"
31#include "xfs_bmap.h"
32#include "xfs_rtalloc.h"
33#include "xfs_error.h"
34#include "xfs_itable.h"
35#include "xfs_attr.h"
36#include "xfs_buf_item.h"
37#include "xfs_trans_space.h"
38#include "xfs_trans_priv.h"
39#include "xfs_qm.h"
40#include "xfs_trace.h"
41
42
43/*
44 LOCK ORDER
45
46 inode lock (ilock)
47 dquot hash-chain lock (hashlock)
48 xqm dquot freelist lock (freelistlock
49 mount's dquot list lock (mplistlock)
50 user dquot lock - lock ordering among dquots is based on the uid or gid
51 group dquot lock - similar to udquots. Between the two dquots, the udquot
52 has to be locked first.
53 pin lock - the dquot lock must be held to take this lock.
54 flush lock - ditto.
55*/
56
57#ifdef DEBUG
58xfs_buftarg_t *xfs_dqerror_target;
59int xfs_do_dqerror;
60int xfs_dqreq_num;
61int xfs_dqerror_mod = 33;
62#endif
63
64static struct lock_class_key xfs_dquot_other_class;
65
66/*
67 * Allocate and initialize a dquot. We don't always allocate fresh memory;
68 * we try to reclaim a free dquot if the number of incore dquots are above
69 * a threshold.
70 * The only field inside the core that gets initialized at this point
71 * is the d_id field. The idea is to fill in the entire q_core
72 * when we read in the on disk dquot.
73 */
74STATIC xfs_dquot_t *
75xfs_qm_dqinit(
76 xfs_mount_t *mp,
77 xfs_dqid_t id,
78 uint type)
79{
80 xfs_dquot_t *dqp;
81 boolean_t brandnewdquot;
82
83 brandnewdquot = xfs_qm_dqalloc_incore(&dqp);
84 dqp->dq_flags = type;
85 dqp->q_core.d_id = cpu_to_be32(id);
86 dqp->q_mount = mp;
87
88 /*
89 * No need to re-initialize these if this is a reclaimed dquot.
90 */
91 if (brandnewdquot) {
92 INIT_LIST_HEAD(&dqp->q_freelist);
93 mutex_init(&dqp->q_qlock);
94 init_waitqueue_head(&dqp->q_pinwait);
95
96 /*
97 * Because we want to use a counting completion, complete
98 * the flush completion once to allow a single access to
99 * the flush completion without blocking.
100 */
101 init_completion(&dqp->q_flush);
102 complete(&dqp->q_flush);
103
104 trace_xfs_dqinit(dqp);
105 } else {
106 /*
107 * Only the q_core portion was zeroed in dqreclaim_one().
108 * So, we need to reset others.
109 */
110 dqp->q_nrefs = 0;
111 dqp->q_blkno = 0;
112 INIT_LIST_HEAD(&dqp->q_mplist);
113 INIT_LIST_HEAD(&dqp->q_hashlist);
114 dqp->q_bufoffset = 0;
115 dqp->q_fileoffset = 0;
116 dqp->q_transp = NULL;
117 dqp->q_gdquot = NULL;
118 dqp->q_res_bcount = 0;
119 dqp->q_res_icount = 0;
120 dqp->q_res_rtbcount = 0;
121 atomic_set(&dqp->q_pincount, 0);
122 dqp->q_hash = NULL;
123 ASSERT(list_empty(&dqp->q_freelist));
124
125 trace_xfs_dqreuse(dqp);
126 }
127
128 /*
129 * In either case we need to make sure group quotas have a different
130 * lock class than user quotas, to make sure lockdep knows we can
131 * locks of one of each at the same time.
132 */
133 if (!(type & XFS_DQ_USER))
134 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_other_class);
135
136 /*
137 * log item gets initialized later
138 */
139 return (dqp);
140}
141
142/*
143 * This is called to free all the memory associated with a dquot
144 */
145void
146xfs_qm_dqdestroy(
147 xfs_dquot_t *dqp)
148{
149 ASSERT(list_empty(&dqp->q_freelist));
150
151 mutex_destroy(&dqp->q_qlock);
152 kmem_zone_free(xfs_Gqm->qm_dqzone, dqp);
153
154 atomic_dec(&xfs_Gqm->qm_totaldquots);
155}
156
157/*
158 * This is what a 'fresh' dquot inside a dquot chunk looks like on disk.
159 */
160STATIC void
161xfs_qm_dqinit_core(
162 xfs_dqid_t id,
163 uint type,
164 xfs_dqblk_t *d)
165{
166 /*
167 * Caller has zero'd the entire dquot 'chunk' already.
168 */
169 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
170 d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
171 d->dd_diskdq.d_id = cpu_to_be32(id);
172 d->dd_diskdq.d_flags = type;
173}
174
175/*
176 * If default limits are in force, push them into the dquot now.
177 * We overwrite the dquot limits only if they are zero and this
178 * is not the root dquot.
179 */
180void
181xfs_qm_adjust_dqlimits(
182 xfs_mount_t *mp,
183 xfs_disk_dquot_t *d)
184{
185 xfs_quotainfo_t *q = mp->m_quotainfo;
186
187 ASSERT(d->d_id);
188
189 if (q->qi_bsoftlimit && !d->d_blk_softlimit)
190 d->d_blk_softlimit = cpu_to_be64(q->qi_bsoftlimit);
191 if (q->qi_bhardlimit && !d->d_blk_hardlimit)
192 d->d_blk_hardlimit = cpu_to_be64(q->qi_bhardlimit);
193 if (q->qi_isoftlimit && !d->d_ino_softlimit)
194 d->d_ino_softlimit = cpu_to_be64(q->qi_isoftlimit);
195 if (q->qi_ihardlimit && !d->d_ino_hardlimit)
196 d->d_ino_hardlimit = cpu_to_be64(q->qi_ihardlimit);
197 if (q->qi_rtbsoftlimit && !d->d_rtb_softlimit)
198 d->d_rtb_softlimit = cpu_to_be64(q->qi_rtbsoftlimit);
199 if (q->qi_rtbhardlimit && !d->d_rtb_hardlimit)
200 d->d_rtb_hardlimit = cpu_to_be64(q->qi_rtbhardlimit);
201}
202
203/*
204 * Check the limits and timers of a dquot and start or reset timers
205 * if necessary.
206 * This gets called even when quota enforcement is OFF, which makes our
207 * life a little less complicated. (We just don't reject any quota
208 * reservations in that case, when enforcement is off).
209 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when
210 * enforcement's off.
211 * In contrast, warnings are a little different in that they don't
212 * 'automatically' get started when limits get exceeded. They do
213 * get reset to zero, however, when we find the count to be under
214 * the soft limit (they are only ever set non-zero via userspace).
215 */
216void
217xfs_qm_adjust_dqtimers(
218 xfs_mount_t *mp,
219 xfs_disk_dquot_t *d)
220{
221 ASSERT(d->d_id);
222
223#ifdef DEBUG
224 if (d->d_blk_hardlimit)
225 ASSERT(be64_to_cpu(d->d_blk_softlimit) <=
226 be64_to_cpu(d->d_blk_hardlimit));
227 if (d->d_ino_hardlimit)
228 ASSERT(be64_to_cpu(d->d_ino_softlimit) <=
229 be64_to_cpu(d->d_ino_hardlimit));
230 if (d->d_rtb_hardlimit)
231 ASSERT(be64_to_cpu(d->d_rtb_softlimit) <=
232 be64_to_cpu(d->d_rtb_hardlimit));
233#endif
234
235 if (!d->d_btimer) {
236 if ((d->d_blk_softlimit &&
237 (be64_to_cpu(d->d_bcount) >=
238 be64_to_cpu(d->d_blk_softlimit))) ||
239 (d->d_blk_hardlimit &&
240 (be64_to_cpu(d->d_bcount) >=
241 be64_to_cpu(d->d_blk_hardlimit)))) {
242 d->d_btimer = cpu_to_be32(get_seconds() +
243 mp->m_quotainfo->qi_btimelimit);
244 } else {
245 d->d_bwarns = 0;
246 }
247 } else {
248 if ((!d->d_blk_softlimit ||
249 (be64_to_cpu(d->d_bcount) <
250 be64_to_cpu(d->d_blk_softlimit))) &&
251 (!d->d_blk_hardlimit ||
252 (be64_to_cpu(d->d_bcount) <
253 be64_to_cpu(d->d_blk_hardlimit)))) {
254 d->d_btimer = 0;
255 }
256 }
257
258 if (!d->d_itimer) {
259 if ((d->d_ino_softlimit &&
260 (be64_to_cpu(d->d_icount) >=
261 be64_to_cpu(d->d_ino_softlimit))) ||
262 (d->d_ino_hardlimit &&
263 (be64_to_cpu(d->d_icount) >=
264 be64_to_cpu(d->d_ino_hardlimit)))) {
265 d->d_itimer = cpu_to_be32(get_seconds() +
266 mp->m_quotainfo->qi_itimelimit);
267 } else {
268 d->d_iwarns = 0;
269 }
270 } else {
271 if ((!d->d_ino_softlimit ||
272 (be64_to_cpu(d->d_icount) <
273 be64_to_cpu(d->d_ino_softlimit))) &&
274 (!d->d_ino_hardlimit ||
275 (be64_to_cpu(d->d_icount) <
276 be64_to_cpu(d->d_ino_hardlimit)))) {
277 d->d_itimer = 0;
278 }
279 }
280
281 if (!d->d_rtbtimer) {
282 if ((d->d_rtb_softlimit &&
283 (be64_to_cpu(d->d_rtbcount) >=
284 be64_to_cpu(d->d_rtb_softlimit))) ||
285 (d->d_rtb_hardlimit &&
286 (be64_to_cpu(d->d_rtbcount) >=
287 be64_to_cpu(d->d_rtb_hardlimit)))) {
288 d->d_rtbtimer = cpu_to_be32(get_seconds() +
289 mp->m_quotainfo->qi_rtbtimelimit);
290 } else {
291 d->d_rtbwarns = 0;
292 }
293 } else {
294 if ((!d->d_rtb_softlimit ||
295 (be64_to_cpu(d->d_rtbcount) <
296 be64_to_cpu(d->d_rtb_softlimit))) &&
297 (!d->d_rtb_hardlimit ||
298 (be64_to_cpu(d->d_rtbcount) <
299 be64_to_cpu(d->d_rtb_hardlimit)))) {
300 d->d_rtbtimer = 0;
301 }
302 }
303}
304
305/*
306 * initialize a buffer full of dquots and log the whole thing
307 */
308STATIC void
309xfs_qm_init_dquot_blk(
310 xfs_trans_t *tp,
311 xfs_mount_t *mp,
312 xfs_dqid_t id,
313 uint type,
314 xfs_buf_t *bp)
315{
316 struct xfs_quotainfo *q = mp->m_quotainfo;
317 xfs_dqblk_t *d;
318 int curid, i;
319
320 ASSERT(tp);
321 ASSERT(xfs_buf_islocked(bp));
322
323 d = bp->b_addr;
324
325 /*
326 * ID of the first dquot in the block - id's are zero based.
327 */
328 curid = id - (id % q->qi_dqperchunk);
329 ASSERT(curid >= 0);
330 memset(d, 0, BBTOB(q->qi_dqchunklen));
331 for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++)
332 xfs_qm_dqinit_core(curid, type, d);
333 xfs_trans_dquot_buf(tp, bp,
334 (type & XFS_DQ_USER ? XFS_BLF_UDQUOT_BUF :
335 ((type & XFS_DQ_PROJ) ? XFS_BLF_PDQUOT_BUF :
336 XFS_BLF_GDQUOT_BUF)));
337 xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1);
338}
339
340
341
342/*
343 * Allocate a block and fill it with dquots.
344 * This is called when the bmapi finds a hole.
345 */
346STATIC int
347xfs_qm_dqalloc(
348 xfs_trans_t **tpp,
349 xfs_mount_t *mp,
350 xfs_dquot_t *dqp,
351 xfs_inode_t *quotip,
352 xfs_fileoff_t offset_fsb,
353 xfs_buf_t **O_bpp)
354{
355 xfs_fsblock_t firstblock;
356 xfs_bmap_free_t flist;
357 xfs_bmbt_irec_t map;
358 int nmaps, error, committed;
359 xfs_buf_t *bp;
360 xfs_trans_t *tp = *tpp;
361
362 ASSERT(tp != NULL);
363
364 trace_xfs_dqalloc(dqp);
365
366 /*
367 * Initialize the bmap freelist prior to calling bmapi code.
368 */
369 xfs_bmap_init(&flist, &firstblock);
370 xfs_ilock(quotip, XFS_ILOCK_EXCL);
371 /*
372 * Return if this type of quotas is turned off while we didn't
373 * have an inode lock
374 */
375 if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
376 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
377 return (ESRCH);
378 }
379
380 xfs_trans_ijoin_ref(tp, quotip, XFS_ILOCK_EXCL);
381 nmaps = 1;
382 if ((error = xfs_bmapi(tp, quotip,
383 offset_fsb, XFS_DQUOT_CLUSTER_SIZE_FSB,
384 XFS_BMAPI_METADATA | XFS_BMAPI_WRITE,
385 &firstblock,
386 XFS_QM_DQALLOC_SPACE_RES(mp),
387 &map, &nmaps, &flist))) {
388 goto error0;
389 }
390 ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
391 ASSERT(nmaps == 1);
392 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
393 (map.br_startblock != HOLESTARTBLOCK));
394
395 /*
396 * Keep track of the blkno to save a lookup later
397 */
398 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
399
400 /* now we can just get the buffer (there's nothing to read yet) */
401 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
402 dqp->q_blkno,
403 mp->m_quotainfo->qi_dqchunklen,
404 0);
405 if (!bp || (error = xfs_buf_geterror(bp)))
406 goto error1;
407 /*
408 * Make a chunk of dquots out of this buffer and log
409 * the entire thing.
410 */
411 xfs_qm_init_dquot_blk(tp, mp, be32_to_cpu(dqp->q_core.d_id),
412 dqp->dq_flags & XFS_DQ_ALLTYPES, bp);
413
414 /*
415 * xfs_bmap_finish() may commit the current transaction and
416 * start a second transaction if the freelist is not empty.
417 *
418 * Since we still want to modify this buffer, we need to
419 * ensure that the buffer is not released on commit of
420 * the first transaction and ensure the buffer is added to the
421 * second transaction.
422 *
423 * If there is only one transaction then don't stop the buffer
424 * from being released when it commits later on.
425 */
426
427 xfs_trans_bhold(tp, bp);
428
429 if ((error = xfs_bmap_finish(tpp, &flist, &committed))) {
430 goto error1;
431 }
432
433 if (committed) {
434 tp = *tpp;
435 xfs_trans_bjoin(tp, bp);
436 } else {
437 xfs_trans_bhold_release(tp, bp);
438 }
439
440 *O_bpp = bp;
441 return 0;
442
443 error1:
444 xfs_bmap_cancel(&flist);
445 error0:
446 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
447
448 return (error);
449}
450
451/*
452 * Maps a dquot to the buffer containing its on-disk version.
453 * This returns a ptr to the buffer containing the on-disk dquot
454 * in the bpp param, and a ptr to the on-disk dquot within that buffer
455 */
456STATIC int
457xfs_qm_dqtobp(
458 xfs_trans_t **tpp,
459 xfs_dquot_t *dqp,
460 xfs_disk_dquot_t **O_ddpp,
461 xfs_buf_t **O_bpp,
462 uint flags)
463{
464 xfs_bmbt_irec_t map;
465 int nmaps = 1, error;
466 xfs_buf_t *bp;
467 xfs_inode_t *quotip = XFS_DQ_TO_QIP(dqp);
468 xfs_mount_t *mp = dqp->q_mount;
469 xfs_disk_dquot_t *ddq;
470 xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id);
471 xfs_trans_t *tp = (tpp ? *tpp : NULL);
472
473 dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;
474
475 xfs_ilock(quotip, XFS_ILOCK_SHARED);
476 if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
477 /*
478 * Return if this type of quotas is turned off while we
479 * didn't have the quota inode lock.
480 */
481 xfs_iunlock(quotip, XFS_ILOCK_SHARED);
482 return ESRCH;
483 }
484
485 /*
486 * Find the block map; no allocations yet
487 */
488 error = xfs_bmapi(NULL, quotip, dqp->q_fileoffset,
489 XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA,
490 NULL, 0, &map, &nmaps, NULL);
491
492 xfs_iunlock(quotip, XFS_ILOCK_SHARED);
493 if (error)
494 return error;
495
496 ASSERT(nmaps == 1);
497 ASSERT(map.br_blockcount == 1);
498
499 /*
500 * Offset of dquot in the (fixed sized) dquot chunk.
501 */
502 dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) *
503 sizeof(xfs_dqblk_t);
504
505 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
506 if (map.br_startblock == HOLESTARTBLOCK) {
507 /*
508 * We don't allocate unless we're asked to
509 */
510 if (!(flags & XFS_QMOPT_DQALLOC))
511 return ENOENT;
512
513 ASSERT(tp);
514 error = xfs_qm_dqalloc(tpp, mp, dqp, quotip,
515 dqp->q_fileoffset, &bp);
516 if (error)
517 return error;
518 tp = *tpp;
519 } else {
520 trace_xfs_dqtobp_read(dqp);
521
522 /*
523 * store the blkno etc so that we don't have to do the
524 * mapping all the time
525 */
526 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
527
528 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
529 dqp->q_blkno,
530 mp->m_quotainfo->qi_dqchunklen,
531 0, &bp);
532 if (error || !bp)
533 return XFS_ERROR(error);
534 }
535
536 ASSERT(xfs_buf_islocked(bp));
537
538 /*
539 * calculate the location of the dquot inside the buffer.
540 */
541 ddq = bp->b_addr + dqp->q_bufoffset;
542
543 /*
544 * A simple sanity check in case we got a corrupted dquot...
545 */
546 error = xfs_qm_dqcheck(mp, ddq, id, dqp->dq_flags & XFS_DQ_ALLTYPES,
547 flags & (XFS_QMOPT_DQREPAIR|XFS_QMOPT_DOWARN),
548 "dqtobp");
549 if (error) {
550 if (!(flags & XFS_QMOPT_DQREPAIR)) {
551 xfs_trans_brelse(tp, bp);
552 return XFS_ERROR(EIO);
553 }
554 }
555
556 *O_bpp = bp;
557 *O_ddpp = ddq;
558
559 return (0);
560}
561
562
563/*
564 * Read in the ondisk dquot using dqtobp() then copy it to an incore version,
565 * and release the buffer immediately.
566 *
567 */
568/* ARGSUSED */
569STATIC int
570xfs_qm_dqread(
571 xfs_trans_t **tpp,
572 xfs_dqid_t id,
573 xfs_dquot_t *dqp, /* dquot to get filled in */
574 uint flags)
575{
576 xfs_disk_dquot_t *ddqp;
577 xfs_buf_t *bp;
578 int error;
579 xfs_trans_t *tp;
580
581 ASSERT(tpp);
582
583 trace_xfs_dqread(dqp);
584
585 /*
586 * get a pointer to the on-disk dquot and the buffer containing it
587 * dqp already knows its own type (GROUP/USER).
588 */
589 if ((error = xfs_qm_dqtobp(tpp, dqp, &ddqp, &bp, flags))) {
590 return (error);
591 }
592 tp = *tpp;
593
594 /* copy everything from disk dquot to the incore dquot */
595 memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t));
596 ASSERT(be32_to_cpu(dqp->q_core.d_id) == id);
597 xfs_qm_dquot_logitem_init(dqp);
598
599 /*
600 * Reservation counters are defined as reservation plus current usage
601 * to avoid having to add every time.
602 */
603 dqp->q_res_bcount = be64_to_cpu(ddqp->d_bcount);
604 dqp->q_res_icount = be64_to_cpu(ddqp->d_icount);
605 dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount);
606
607 /* Mark the buf so that this will stay incore a little longer */
608 XFS_BUF_SET_VTYPE_REF(bp, B_FS_DQUOT, XFS_DQUOT_REF);
609
610 /*
611 * We got the buffer with a xfs_trans_read_buf() (in dqtobp())
612 * So we need to release with xfs_trans_brelse().
613 * The strategy here is identical to that of inodes; we lock
614 * the dquot in xfs_qm_dqget() before making it accessible to
615 * others. This is because dquots, like inodes, need a good level of
616 * concurrency, and we don't want to take locks on the entire buffers
617 * for dquot accesses.
618 * Note also that the dquot buffer may even be dirty at this point, if
619 * this particular dquot was repaired. We still aren't afraid to
620 * brelse it because we have the changes incore.
621 */
622 ASSERT(xfs_buf_islocked(bp));
623 xfs_trans_brelse(tp, bp);
624
625 return (error);
626}
627
628
629/*
630 * allocate an incore dquot from the kernel heap,
631 * and fill its core with quota information kept on disk.
632 * If XFS_QMOPT_DQALLOC is set, it'll allocate a dquot on disk
633 * if it wasn't already allocated.
634 */
635STATIC int
636xfs_qm_idtodq(
637 xfs_mount_t *mp,
638 xfs_dqid_t id, /* gid or uid, depending on type */
639 uint type, /* UDQUOT or GDQUOT */
640 uint flags, /* DQALLOC, DQREPAIR */
641 xfs_dquot_t **O_dqpp)/* OUT : incore dquot, not locked */
642{
643 xfs_dquot_t *dqp;
644 int error;
645 xfs_trans_t *tp;
646 int cancelflags=0;
647
648 dqp = xfs_qm_dqinit(mp, id, type);
649 tp = NULL;
650 if (flags & XFS_QMOPT_DQALLOC) {
651 tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC);
652 error = xfs_trans_reserve(tp, XFS_QM_DQALLOC_SPACE_RES(mp),
653 XFS_WRITE_LOG_RES(mp) +
654 BBTOB(mp->m_quotainfo->qi_dqchunklen) - 1 +
655 128,
656 0,
657 XFS_TRANS_PERM_LOG_RES,
658 XFS_WRITE_LOG_COUNT);
659 if (error) {
660 cancelflags = 0;
661 goto error0;
662 }
663 cancelflags = XFS_TRANS_RELEASE_LOG_RES;
664 }
665
666 /*
667 * Read it from disk; xfs_dqread() takes care of
668 * all the necessary initialization of dquot's fields (locks, etc)
669 */
670 if ((error = xfs_qm_dqread(&tp, id, dqp, flags))) {
671 /*
672 * This can happen if quotas got turned off (ESRCH),
673 * or if the dquot didn't exist on disk and we ask to
674 * allocate (ENOENT).
675 */
676 trace_xfs_dqread_fail(dqp);
677 cancelflags |= XFS_TRANS_ABORT;
678 goto error0;
679 }
680 if (tp) {
681 if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES)))
682 goto error1;
683 }
684
685 *O_dqpp = dqp;
686 return (0);
687
688 error0:
689 ASSERT(error);
690 if (tp)
691 xfs_trans_cancel(tp, cancelflags);
692 error1:
693 xfs_qm_dqdestroy(dqp);
694 *O_dqpp = NULL;
695 return (error);
696}
697
698/*
699 * Lookup a dquot in the incore dquot hashtable. We keep two separate
700 * hashtables for user and group dquots; and, these are global tables
701 * inside the XQM, not per-filesystem tables.
702 * The hash chain must be locked by caller, and it is left locked
703 * on return. Returning dquot is locked.
704 */
705STATIC int
706xfs_qm_dqlookup(
707 xfs_mount_t *mp,
708 xfs_dqid_t id,
709 xfs_dqhash_t *qh,
710 xfs_dquot_t **O_dqpp)
711{
712 xfs_dquot_t *dqp;
713 uint flist_locked;
714
715 ASSERT(mutex_is_locked(&qh->qh_lock));
716
717 flist_locked = B_FALSE;
718
719 /*
720 * Traverse the hashchain looking for a match
721 */
722 list_for_each_entry(dqp, &qh->qh_list, q_hashlist) {
723 /*
724 * We already have the hashlock. We don't need the
725 * dqlock to look at the id field of the dquot, since the
726 * id can't be modified without the hashlock anyway.
727 */
728 if (be32_to_cpu(dqp->q_core.d_id) == id && dqp->q_mount == mp) {
729 trace_xfs_dqlookup_found(dqp);
730
731 /*
732 * All in core dquots must be on the dqlist of mp
733 */
734 ASSERT(!list_empty(&dqp->q_mplist));
735
736 xfs_dqlock(dqp);
737 if (dqp->q_nrefs == 0) {
738 ASSERT(!list_empty(&dqp->q_freelist));
739 if (!mutex_trylock(&xfs_Gqm->qm_dqfrlist_lock)) {
740 trace_xfs_dqlookup_want(dqp);
741
742 /*
743 * We may have raced with dqreclaim_one()
744 * (and lost). So, flag that we don't
745 * want the dquot to be reclaimed.
746 */
747 dqp->dq_flags |= XFS_DQ_WANT;
748 xfs_dqunlock(dqp);
749 mutex_lock(&xfs_Gqm->qm_dqfrlist_lock);
750 xfs_dqlock(dqp);
751 dqp->dq_flags &= ~(XFS_DQ_WANT);
752 }
753 flist_locked = B_TRUE;
754 }
755
756 /*
757 * id couldn't have changed; we had the hashlock all
758 * along
759 */
760 ASSERT(be32_to_cpu(dqp->q_core.d_id) == id);
761
762 if (flist_locked) {
763 if (dqp->q_nrefs != 0) {
764 mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
765 flist_locked = B_FALSE;
766 } else {
767 /* take it off the freelist */
768 trace_xfs_dqlookup_freelist(dqp);
769 list_del_init(&dqp->q_freelist);
770 xfs_Gqm->qm_dqfrlist_cnt--;
771 }
772 }
773
774 XFS_DQHOLD(dqp);
775
776 if (flist_locked)
777 mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
778 /*
779 * move the dquot to the front of the hashchain
780 */
781 ASSERT(mutex_is_locked(&qh->qh_lock));
782 list_move(&dqp->q_hashlist, &qh->qh_list);
783 trace_xfs_dqlookup_done(dqp);
784 *O_dqpp = dqp;
785 return 0;
786 }
787 }
788
789 *O_dqpp = NULL;
790 ASSERT(mutex_is_locked(&qh->qh_lock));
791 return (1);
792}
793
794/*
795 * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a
796 * a locked dquot, doing an allocation (if requested) as needed.
797 * When both an inode and an id are given, the inode's id takes precedence.
798 * That is, if the id changes while we don't hold the ilock inside this
799 * function, the new dquot is returned, not necessarily the one requested
800 * in the id argument.
801 */
802int
803xfs_qm_dqget(
804 xfs_mount_t *mp,
805 xfs_inode_t *ip, /* locked inode (optional) */
806 xfs_dqid_t id, /* uid/projid/gid depending on type */
807 uint type, /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */
808 uint flags, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
809 xfs_dquot_t **O_dqpp) /* OUT : locked incore dquot */
810{
811 xfs_dquot_t *dqp;
812 xfs_dqhash_t *h;
813 uint version;
814 int error;
815
816 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
817 if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) ||
818 (! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) ||
819 (! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) {
820 return (ESRCH);
821 }
822 h = XFS_DQ_HASH(mp, id, type);
823
824#ifdef DEBUG
825 if (xfs_do_dqerror) {
826 if ((xfs_dqerror_target == mp->m_ddev_targp) &&
827 (xfs_dqreq_num++ % xfs_dqerror_mod) == 0) {
828 xfs_debug(mp, "Returning error in dqget");
829 return (EIO);
830 }
831 }
832#endif
833
834 again:
835
836#ifdef DEBUG
837 ASSERT(type == XFS_DQ_USER ||
838 type == XFS_DQ_PROJ ||
839 type == XFS_DQ_GROUP);
840 if (ip) {
841 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
842 if (type == XFS_DQ_USER)
843 ASSERT(ip->i_udquot == NULL);
844 else
845 ASSERT(ip->i_gdquot == NULL);
846 }
847#endif
848 mutex_lock(&h->qh_lock);
849
850 /*
851 * Look in the cache (hashtable).
852 * The chain is kept locked during lookup.
853 */
854 if (xfs_qm_dqlookup(mp, id, h, O_dqpp) == 0) {
855 XQM_STATS_INC(xqmstats.xs_qm_dqcachehits);
856 /*
857 * The dquot was found, moved to the front of the chain,
858 * taken off the freelist if it was on it, and locked
859 * at this point. Just unlock the hashchain and return.
860 */
861 ASSERT(*O_dqpp);
862 ASSERT(XFS_DQ_IS_LOCKED(*O_dqpp));
863 mutex_unlock(&h->qh_lock);
864 trace_xfs_dqget_hit(*O_dqpp);
865 return (0); /* success */
866 }
867 XQM_STATS_INC(xqmstats.xs_qm_dqcachemisses);
868
869 /*
870 * Dquot cache miss. We don't want to keep the inode lock across
871 * a (potential) disk read. Also we don't want to deal with the lock
872 * ordering between quotainode and this inode. OTOH, dropping the inode
873 * lock here means dealing with a chown that can happen before
874 * we re-acquire the lock.
875 */
876 if (ip)
877 xfs_iunlock(ip, XFS_ILOCK_EXCL);
878 /*
879 * Save the hashchain version stamp, and unlock the chain, so that
880 * we don't keep the lock across a disk read
881 */
882 version = h->qh_version;
883 mutex_unlock(&h->qh_lock);
884
885 /*
886 * Allocate the dquot on the kernel heap, and read the ondisk
887 * portion off the disk. Also, do all the necessary initialization
888 * This can return ENOENT if dquot didn't exist on disk and we didn't
889 * ask it to allocate; ESRCH if quotas got turned off suddenly.
890 */
891 if ((error = xfs_qm_idtodq(mp, id, type,
892 flags & (XFS_QMOPT_DQALLOC|XFS_QMOPT_DQREPAIR|
893 XFS_QMOPT_DOWARN),
894 &dqp))) {
895 if (ip)
896 xfs_ilock(ip, XFS_ILOCK_EXCL);
897 return (error);
898 }
899
900 /*
901 * See if this is mount code calling to look at the overall quota limits
902 * which are stored in the id == 0 user or group's dquot.
903 * Since we may not have done a quotacheck by this point, just return
904 * the dquot without attaching it to any hashtables, lists, etc, or even
905 * taking a reference.
906 * The caller must dqdestroy this once done.
907 */
908 if (flags & XFS_QMOPT_DQSUSER) {
909 ASSERT(id == 0);
910 ASSERT(! ip);
911 goto dqret;
912 }
913
914 /*
915 * Dquot lock comes after hashlock in the lock ordering
916 */
917 if (ip) {
918 xfs_ilock(ip, XFS_ILOCK_EXCL);
919
920 /*
921 * A dquot could be attached to this inode by now, since
922 * we had dropped the ilock.
923 */
924 if (type == XFS_DQ_USER) {
925 if (!XFS_IS_UQUOTA_ON(mp)) {
926 /* inode stays locked on return */
927 xfs_qm_dqdestroy(dqp);
928 return XFS_ERROR(ESRCH);
929 }
930 if (ip->i_udquot) {
931 xfs_qm_dqdestroy(dqp);
932 dqp = ip->i_udquot;
933 xfs_dqlock(dqp);
934 goto dqret;
935 }
936 } else {
937 if (!XFS_IS_OQUOTA_ON(mp)) {
938 /* inode stays locked on return */
939 xfs_qm_dqdestroy(dqp);
940 return XFS_ERROR(ESRCH);
941 }
942 if (ip->i_gdquot) {
943 xfs_qm_dqdestroy(dqp);
944 dqp = ip->i_gdquot;
945 xfs_dqlock(dqp);
946 goto dqret;
947 }
948 }
949 }
950
951 /*
952 * Hashlock comes after ilock in lock order
953 */
954 mutex_lock(&h->qh_lock);
955 if (version != h->qh_version) {
956 xfs_dquot_t *tmpdqp;
957 /*
958 * Now, see if somebody else put the dquot in the
959 * hashtable before us. This can happen because we didn't
960 * keep the hashchain lock. We don't have to worry about
961 * lock order between the two dquots here since dqp isn't
962 * on any findable lists yet.
963 */
964 if (xfs_qm_dqlookup(mp, id, h, &tmpdqp) == 0) {
965 /*
966 * Duplicate found. Just throw away the new dquot
967 * and start over.
968 */
969 xfs_qm_dqput(tmpdqp);
970 mutex_unlock(&h->qh_lock);
971 xfs_qm_dqdestroy(dqp);
972 XQM_STATS_INC(xqmstats.xs_qm_dquot_dups);
973 goto again;
974 }
975 }
976
977 /*
978 * Put the dquot at the beginning of the hash-chain and mp's list
979 * LOCK ORDER: hashlock, freelistlock, mplistlock, udqlock, gdqlock ..
980 */
981 ASSERT(mutex_is_locked(&h->qh_lock));
982 dqp->q_hash = h;
983 list_add(&dqp->q_hashlist, &h->qh_list);
984 h->qh_version++;
985
986 /*
987 * Attach this dquot to this filesystem's list of all dquots,
988 * kept inside the mount structure in m_quotainfo field
989 */
990 mutex_lock(&mp->m_quotainfo->qi_dqlist_lock);
991
992 /*
993 * We return a locked dquot to the caller, with a reference taken
994 */
995 xfs_dqlock(dqp);
996 dqp->q_nrefs = 1;
997
998 list_add(&dqp->q_mplist, &mp->m_quotainfo->qi_dqlist);
999 mp->m_quotainfo->qi_dquots++;
1000 mutex_unlock(&mp->m_quotainfo->qi_dqlist_lock);
1001 mutex_unlock(&h->qh_lock);
1002 dqret:
1003 ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL));
1004 trace_xfs_dqget_miss(dqp);
1005 *O_dqpp = dqp;
1006 return (0);
1007}
1008
1009
1010/*
1011 * Release a reference to the dquot (decrement ref-count)
1012 * and unlock it. If there is a group quota attached to this
1013 * dquot, carefully release that too without tripping over
1014 * deadlocks'n'stuff.
1015 */
1016void
1017xfs_qm_dqput(
1018 xfs_dquot_t *dqp)
1019{
1020 xfs_dquot_t *gdqp;
1021
1022 ASSERT(dqp->q_nrefs > 0);
1023 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1024
1025 trace_xfs_dqput(dqp);
1026
1027 if (dqp->q_nrefs != 1) {
1028 dqp->q_nrefs--;
1029 xfs_dqunlock(dqp);
1030 return;
1031 }
1032
1033 /*
1034 * drop the dqlock and acquire the freelist and dqlock
1035 * in the right order; but try to get it out-of-order first
1036 */
1037 if (!mutex_trylock(&xfs_Gqm->qm_dqfrlist_lock)) {
1038 trace_xfs_dqput_wait(dqp);
1039 xfs_dqunlock(dqp);
1040 mutex_lock(&xfs_Gqm->qm_dqfrlist_lock);
1041 xfs_dqlock(dqp);
1042 }
1043
1044 while (1) {
1045 gdqp = NULL;
1046
1047 /* We can't depend on nrefs being == 1 here */
1048 if (--dqp->q_nrefs == 0) {
1049 trace_xfs_dqput_free(dqp);
1050
1051 list_add_tail(&dqp->q_freelist, &xfs_Gqm->qm_dqfrlist);
1052 xfs_Gqm->qm_dqfrlist_cnt++;
1053
1054 /*
1055 * If we just added a udquot to the freelist, then
1056 * we want to release the gdquot reference that
1057 * it (probably) has. Otherwise it'll keep the
1058 * gdquot from getting reclaimed.
1059 */
1060 if ((gdqp = dqp->q_gdquot)) {
1061 /*
1062 * Avoid a recursive dqput call
1063 */
1064 xfs_dqlock(gdqp);
1065 dqp->q_gdquot = NULL;
1066 }
1067 }
1068 xfs_dqunlock(dqp);
1069
1070 /*
1071 * If we had a group quota inside the user quota as a hint,
1072 * release it now.
1073 */
1074 if (! gdqp)
1075 break;
1076 dqp = gdqp;
1077 }
1078 mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
1079}
1080
1081/*
1082 * Release a dquot. Flush it if dirty, then dqput() it.
1083 * dquot must not be locked.
1084 */
1085void
1086xfs_qm_dqrele(
1087 xfs_dquot_t *dqp)
1088{
1089 if (!dqp)
1090 return;
1091
1092 trace_xfs_dqrele(dqp);
1093
1094 xfs_dqlock(dqp);
1095 /*
1096 * We don't care to flush it if the dquot is dirty here.
1097 * That will create stutters that we want to avoid.
1098 * Instead we do a delayed write when we try to reclaim
1099 * a dirty dquot. Also xfs_sync will take part of the burden...
1100 */
1101 xfs_qm_dqput(dqp);
1102}
1103
1104/*
1105 * This is the dquot flushing I/O completion routine. It is called
1106 * from interrupt level when the buffer containing the dquot is
1107 * flushed to disk. It is responsible for removing the dquot logitem
1108 * from the AIL if it has not been re-logged, and unlocking the dquot's
1109 * flush lock. This behavior is very similar to that of inodes..
1110 */
1111STATIC void
1112xfs_qm_dqflush_done(
1113 struct xfs_buf *bp,
1114 struct xfs_log_item *lip)
1115{
1116 xfs_dq_logitem_t *qip = (struct xfs_dq_logitem *)lip;
1117 xfs_dquot_t *dqp = qip->qli_dquot;
1118 struct xfs_ail *ailp = lip->li_ailp;
1119
1120 /*
1121 * We only want to pull the item from the AIL if its
1122 * location in the log has not changed since we started the flush.
1123 * Thus, we only bother if the dquot's lsn has
1124 * not changed. First we check the lsn outside the lock
1125 * since it's cheaper, and then we recheck while
1126 * holding the lock before removing the dquot from the AIL.
1127 */
1128 if ((lip->li_flags & XFS_LI_IN_AIL) &&
1129 lip->li_lsn == qip->qli_flush_lsn) {
1130
1131 /* xfs_trans_ail_delete() drops the AIL lock. */
1132 spin_lock(&ailp->xa_lock);
1133 if (lip->li_lsn == qip->qli_flush_lsn)
1134 xfs_trans_ail_delete(ailp, lip);
1135 else
1136 spin_unlock(&ailp->xa_lock);
1137 }
1138
1139 /*
1140 * Release the dq's flush lock since we're done with it.
1141 */
1142 xfs_dqfunlock(dqp);
1143}
1144
1145/*
1146 * Write a modified dquot to disk.
1147 * The dquot must be locked and the flush lock too taken by caller.
1148 * The flush lock will not be unlocked until the dquot reaches the disk,
1149 * but the dquot is free to be unlocked and modified by the caller
1150 * in the interim. Dquot is still locked on return. This behavior is
1151 * identical to that of inodes.
1152 */
1153int
1154xfs_qm_dqflush(
1155 xfs_dquot_t *dqp,
1156 uint flags)
1157{
1158 struct xfs_mount *mp = dqp->q_mount;
1159 struct xfs_buf *bp;
1160 struct xfs_disk_dquot *ddqp;
1161 int error;
1162
1163 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1164 ASSERT(!completion_done(&dqp->q_flush));
1165
1166 trace_xfs_dqflush(dqp);
1167
1168 /*
1169 * If not dirty, or it's pinned and we are not supposed to block, nada.
1170 */
1171 if (!XFS_DQ_IS_DIRTY(dqp) ||
1172 (!(flags & SYNC_WAIT) && atomic_read(&dqp->q_pincount) > 0)) {
1173 xfs_dqfunlock(dqp);
1174 return 0;
1175 }
1176 xfs_qm_dqunpin_wait(dqp);
1177
1178 /*
1179 * This may have been unpinned because the filesystem is shutting
1180 * down forcibly. If that's the case we must not write this dquot
1181 * to disk, because the log record didn't make it to disk!
1182 */
1183 if (XFS_FORCED_SHUTDOWN(mp)) {
1184 dqp->dq_flags &= ~XFS_DQ_DIRTY;
1185 xfs_dqfunlock(dqp);
1186 return XFS_ERROR(EIO);
1187 }
1188
1189 /*
1190 * Get the buffer containing the on-disk dquot
1191 */
1192 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
1193 mp->m_quotainfo->qi_dqchunklen, 0, &bp);
1194 if (error) {
1195 ASSERT(error != ENOENT);
1196 xfs_dqfunlock(dqp);
1197 return error;
1198 }
1199
1200 /*
1201 * Calculate the location of the dquot inside the buffer.
1202 */
1203 ddqp = bp->b_addr + dqp->q_bufoffset;
1204
1205 /*
1206 * A simple sanity check in case we got a corrupted dquot..
1207 */
1208 error = xfs_qm_dqcheck(mp, &dqp->q_core, be32_to_cpu(ddqp->d_id), 0,
1209 XFS_QMOPT_DOWARN, "dqflush (incore copy)");
1210 if (error) {
1211 xfs_buf_relse(bp);
1212 xfs_dqfunlock(dqp);
1213 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1214 return XFS_ERROR(EIO);
1215 }
1216
1217 /* This is the only portion of data that needs to persist */
1218 memcpy(ddqp, &dqp->q_core, sizeof(xfs_disk_dquot_t));
1219
1220 /*
1221 * Clear the dirty field and remember the flush lsn for later use.
1222 */
1223 dqp->dq_flags &= ~XFS_DQ_DIRTY;
1224
1225 xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn,
1226 &dqp->q_logitem.qli_item.li_lsn);
1227
1228 /*
1229 * Attach an iodone routine so that we can remove this dquot from the
1230 * AIL and release the flush lock once the dquot is synced to disk.
1231 */
1232 xfs_buf_attach_iodone(bp, xfs_qm_dqflush_done,
1233 &dqp->q_logitem.qli_item);
1234
1235 /*
1236 * If the buffer is pinned then push on the log so we won't
1237 * get stuck waiting in the write for too long.
1238 */
1239 if (xfs_buf_ispinned(bp)) {
1240 trace_xfs_dqflush_force(dqp);
1241 xfs_log_force(mp, 0);
1242 }
1243
1244 if (flags & SYNC_WAIT)
1245 error = xfs_bwrite(mp, bp);
1246 else
1247 xfs_bdwrite(mp, bp);
1248
1249 trace_xfs_dqflush_done(dqp);
1250
1251 /*
1252 * dqp is still locked, but caller is free to unlock it now.
1253 */
1254 return error;
1255
1256}
1257
1258int
1259xfs_qm_dqlock_nowait(
1260 xfs_dquot_t *dqp)
1261{
1262 return mutex_trylock(&dqp->q_qlock);
1263}
1264
1265void
1266xfs_dqlock(
1267 xfs_dquot_t *dqp)
1268{
1269 mutex_lock(&dqp->q_qlock);
1270}
1271
1272void
1273xfs_dqunlock(
1274 xfs_dquot_t *dqp)
1275{
1276 mutex_unlock(&(dqp->q_qlock));
1277 if (dqp->q_logitem.qli_dquot == dqp) {
1278 /* Once was dqp->q_mount, but might just have been cleared */
1279 xfs_trans_unlocked_item(dqp->q_logitem.qli_item.li_ailp,
1280 (xfs_log_item_t*)&(dqp->q_logitem));
1281 }
1282}
1283
1284
1285void
1286xfs_dqunlock_nonotify(
1287 xfs_dquot_t *dqp)
1288{
1289 mutex_unlock(&(dqp->q_qlock));
1290}
1291
1292/*
1293 * Lock two xfs_dquot structures.
1294 *
1295 * To avoid deadlocks we always lock the quota structure with
1296 * the lowerd id first.
1297 */
1298void
1299xfs_dqlock2(
1300 xfs_dquot_t *d1,
1301 xfs_dquot_t *d2)
1302{
1303 if (d1 && d2) {
1304 ASSERT(d1 != d2);
1305 if (be32_to_cpu(d1->q_core.d_id) >
1306 be32_to_cpu(d2->q_core.d_id)) {
1307 mutex_lock(&d2->q_qlock);
1308 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
1309 } else {
1310 mutex_lock(&d1->q_qlock);
1311 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
1312 }
1313 } else if (d1) {
1314 mutex_lock(&d1->q_qlock);
1315 } else if (d2) {
1316 mutex_lock(&d2->q_qlock);
1317 }
1318}
1319
1320
1321/*
1322 * Take a dquot out of the mount's dqlist as well as the hashlist.
1323 * This is called via unmount as well as quotaoff, and the purge
1324 * will always succeed unless there are soft (temp) references
1325 * outstanding.
1326 *
1327 * This returns 0 if it was purged, 1 if it wasn't. It's not an error code
1328 * that we're returning! XXXsup - not cool.
1329 */
1330/* ARGSUSED */
1331int
1332xfs_qm_dqpurge(
1333 xfs_dquot_t *dqp)
1334{
1335 xfs_dqhash_t *qh = dqp->q_hash;
1336 xfs_mount_t *mp = dqp->q_mount;
1337
1338 ASSERT(mutex_is_locked(&mp->m_quotainfo->qi_dqlist_lock));
1339 ASSERT(mutex_is_locked(&dqp->q_hash->qh_lock));
1340
1341 xfs_dqlock(dqp);
1342 /*
1343 * We really can't afford to purge a dquot that is
1344 * referenced, because these are hard refs.
1345 * It shouldn't happen in general because we went thru _all_ inodes in
1346 * dqrele_all_inodes before calling this and didn't let the mountlock go.
1347 * However it is possible that we have dquots with temporary
1348 * references that are not attached to an inode. e.g. see xfs_setattr().
1349 */
1350 if (dqp->q_nrefs != 0) {
1351 xfs_dqunlock(dqp);
1352 mutex_unlock(&dqp->q_hash->qh_lock);
1353 return (1);
1354 }
1355
1356 ASSERT(!list_empty(&dqp->q_freelist));
1357
1358 /*
1359 * If we're turning off quotas, we have to make sure that, for
1360 * example, we don't delete quota disk blocks while dquots are
1361 * in the process of getting written to those disk blocks.
1362 * This dquot might well be on AIL, and we can't leave it there
1363 * if we're turning off quotas. Basically, we need this flush
1364 * lock, and are willing to block on it.
1365 */
1366 if (!xfs_dqflock_nowait(dqp)) {
1367 /*
1368 * Block on the flush lock after nudging dquot buffer,
1369 * if it is incore.
1370 */
1371 xfs_qm_dqflock_pushbuf_wait(dqp);
1372 }
1373
1374 /*
1375 * XXXIf we're turning this type of quotas off, we don't care
1376 * about the dirty metadata sitting in this dquot. OTOH, if
1377 * we're unmounting, we do care, so we flush it and wait.
1378 */
1379 if (XFS_DQ_IS_DIRTY(dqp)) {
1380 int error;
1381
1382 /* dqflush unlocks dqflock */
1383 /*
1384 * Given that dqpurge is a very rare occurrence, it is OK
1385 * that we're holding the hashlist and mplist locks
1386 * across the disk write. But, ... XXXsup
1387 *
1388 * We don't care about getting disk errors here. We need
1389 * to purge this dquot anyway, so we go ahead regardless.
1390 */
1391 error = xfs_qm_dqflush(dqp, SYNC_WAIT);
1392 if (error)
1393 xfs_warn(mp, "%s: dquot %p flush failed",
1394 __func__, dqp);
1395 xfs_dqflock(dqp);
1396 }
1397 ASSERT(atomic_read(&dqp->q_pincount) == 0);
1398 ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1399 !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
1400
1401 list_del_init(&dqp->q_hashlist);
1402 qh->qh_version++;
1403 list_del_init(&dqp->q_mplist);
1404 mp->m_quotainfo->qi_dqreclaims++;
1405 mp->m_quotainfo->qi_dquots--;
1406 /*
1407 * XXX Move this to the front of the freelist, if we can get the
1408 * freelist lock.
1409 */
1410 ASSERT(!list_empty(&dqp->q_freelist));
1411
1412 dqp->q_mount = NULL;
1413 dqp->q_hash = NULL;
1414 dqp->dq_flags = XFS_DQ_INACTIVE;
1415 memset(&dqp->q_core, 0, sizeof(dqp->q_core));
1416 xfs_dqfunlock(dqp);
1417 xfs_dqunlock(dqp);
1418 mutex_unlock(&qh->qh_lock);
1419 return (0);
1420}
1421
1422
1423/*
1424 * Give the buffer a little push if it is incore and
1425 * wait on the flush lock.
1426 */
1427void
1428xfs_qm_dqflock_pushbuf_wait(
1429 xfs_dquot_t *dqp)
1430{
1431 xfs_mount_t *mp = dqp->q_mount;
1432 xfs_buf_t *bp;
1433
1434 /*
1435 * Check to see if the dquot has been flushed delayed
1436 * write. If so, grab its buffer and send it
1437 * out immediately. We'll be able to acquire
1438 * the flush lock when the I/O completes.
1439 */
1440 bp = xfs_incore(mp->m_ddev_targp, dqp->q_blkno,
1441 mp->m_quotainfo->qi_dqchunklen, XBF_TRYLOCK);
1442 if (!bp)
1443 goto out_lock;
1444
1445 if (XFS_BUF_ISDELAYWRITE(bp)) {
1446 if (xfs_buf_ispinned(bp))
1447 xfs_log_force(mp, 0);
1448 xfs_buf_delwri_promote(bp);
1449 wake_up_process(bp->b_target->bt_task);
1450 }
1451 xfs_buf_relse(bp);
1452out_lock:
1453 xfs_dqflock(dqp);
1454}
1/*
2 * Copyright (c) 2000-2003 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_format.h"
21#include "xfs_log_format.h"
22#include "xfs_shared.h"
23#include "xfs_trans_resv.h"
24#include "xfs_bit.h"
25#include "xfs_mount.h"
26#include "xfs_defer.h"
27#include "xfs_inode.h"
28#include "xfs_bmap.h"
29#include "xfs_bmap_util.h"
30#include "xfs_alloc.h"
31#include "xfs_quota.h"
32#include "xfs_error.h"
33#include "xfs_trans.h"
34#include "xfs_buf_item.h"
35#include "xfs_trans_space.h"
36#include "xfs_trans_priv.h"
37#include "xfs_qm.h"
38#include "xfs_cksum.h"
39#include "xfs_trace.h"
40#include "xfs_log.h"
41#include "xfs_bmap_btree.h"
42
43/*
44 * Lock order:
45 *
46 * ip->i_lock
47 * qi->qi_tree_lock
48 * dquot->q_qlock (xfs_dqlock() and friends)
49 * dquot->q_flush (xfs_dqflock() and friends)
50 * qi->qi_lru_lock
51 *
52 * If two dquots need to be locked the order is user before group/project,
53 * otherwise by the lowest id first, see xfs_dqlock2.
54 */
55
56#ifdef DEBUG
57xfs_buftarg_t *xfs_dqerror_target;
58int xfs_do_dqerror;
59int xfs_dqreq_num;
60int xfs_dqerror_mod = 33;
61#endif
62
63struct kmem_zone *xfs_qm_dqtrxzone;
64static struct kmem_zone *xfs_qm_dqzone;
65
66static struct lock_class_key xfs_dquot_group_class;
67static struct lock_class_key xfs_dquot_project_class;
68
69/*
70 * This is called to free all the memory associated with a dquot
71 */
72void
73xfs_qm_dqdestroy(
74 xfs_dquot_t *dqp)
75{
76 ASSERT(list_empty(&dqp->q_lru));
77
78 kmem_free(dqp->q_logitem.qli_item.li_lv_shadow);
79 mutex_destroy(&dqp->q_qlock);
80
81 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot);
82 kmem_zone_free(xfs_qm_dqzone, dqp);
83}
84
85/*
86 * If default limits are in force, push them into the dquot now.
87 * We overwrite the dquot limits only if they are zero and this
88 * is not the root dquot.
89 */
90void
91xfs_qm_adjust_dqlimits(
92 struct xfs_mount *mp,
93 struct xfs_dquot *dq)
94{
95 struct xfs_quotainfo *q = mp->m_quotainfo;
96 struct xfs_disk_dquot *d = &dq->q_core;
97 struct xfs_def_quota *defq;
98 int prealloc = 0;
99
100 ASSERT(d->d_id);
101 defq = xfs_get_defquota(dq, q);
102
103 if (defq->bsoftlimit && !d->d_blk_softlimit) {
104 d->d_blk_softlimit = cpu_to_be64(defq->bsoftlimit);
105 prealloc = 1;
106 }
107 if (defq->bhardlimit && !d->d_blk_hardlimit) {
108 d->d_blk_hardlimit = cpu_to_be64(defq->bhardlimit);
109 prealloc = 1;
110 }
111 if (defq->isoftlimit && !d->d_ino_softlimit)
112 d->d_ino_softlimit = cpu_to_be64(defq->isoftlimit);
113 if (defq->ihardlimit && !d->d_ino_hardlimit)
114 d->d_ino_hardlimit = cpu_to_be64(defq->ihardlimit);
115 if (defq->rtbsoftlimit && !d->d_rtb_softlimit)
116 d->d_rtb_softlimit = cpu_to_be64(defq->rtbsoftlimit);
117 if (defq->rtbhardlimit && !d->d_rtb_hardlimit)
118 d->d_rtb_hardlimit = cpu_to_be64(defq->rtbhardlimit);
119
120 if (prealloc)
121 xfs_dquot_set_prealloc_limits(dq);
122}
123
124/*
125 * Check the limits and timers of a dquot and start or reset timers
126 * if necessary.
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
131 * enforcement's off.
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).
136 */
137void
138xfs_qm_adjust_dqtimers(
139 xfs_mount_t *mp,
140 xfs_disk_dquot_t *d)
141{
142 ASSERT(d->d_id);
143
144#ifdef DEBUG
145 if (d->d_blk_hardlimit)
146 ASSERT(be64_to_cpu(d->d_blk_softlimit) <=
147 be64_to_cpu(d->d_blk_hardlimit));
148 if (d->d_ino_hardlimit)
149 ASSERT(be64_to_cpu(d->d_ino_softlimit) <=
150 be64_to_cpu(d->d_ino_hardlimit));
151 if (d->d_rtb_hardlimit)
152 ASSERT(be64_to_cpu(d->d_rtb_softlimit) <=
153 be64_to_cpu(d->d_rtb_hardlimit));
154#endif
155
156 if (!d->d_btimer) {
157 if ((d->d_blk_softlimit &&
158 (be64_to_cpu(d->d_bcount) >
159 be64_to_cpu(d->d_blk_softlimit))) ||
160 (d->d_blk_hardlimit &&
161 (be64_to_cpu(d->d_bcount) >
162 be64_to_cpu(d->d_blk_hardlimit)))) {
163 d->d_btimer = cpu_to_be32(get_seconds() +
164 mp->m_quotainfo->qi_btimelimit);
165 } else {
166 d->d_bwarns = 0;
167 }
168 } else {
169 if ((!d->d_blk_softlimit ||
170 (be64_to_cpu(d->d_bcount) <=
171 be64_to_cpu(d->d_blk_softlimit))) &&
172 (!d->d_blk_hardlimit ||
173 (be64_to_cpu(d->d_bcount) <=
174 be64_to_cpu(d->d_blk_hardlimit)))) {
175 d->d_btimer = 0;
176 }
177 }
178
179 if (!d->d_itimer) {
180 if ((d->d_ino_softlimit &&
181 (be64_to_cpu(d->d_icount) >
182 be64_to_cpu(d->d_ino_softlimit))) ||
183 (d->d_ino_hardlimit &&
184 (be64_to_cpu(d->d_icount) >
185 be64_to_cpu(d->d_ino_hardlimit)))) {
186 d->d_itimer = cpu_to_be32(get_seconds() +
187 mp->m_quotainfo->qi_itimelimit);
188 } else {
189 d->d_iwarns = 0;
190 }
191 } else {
192 if ((!d->d_ino_softlimit ||
193 (be64_to_cpu(d->d_icount) <=
194 be64_to_cpu(d->d_ino_softlimit))) &&
195 (!d->d_ino_hardlimit ||
196 (be64_to_cpu(d->d_icount) <=
197 be64_to_cpu(d->d_ino_hardlimit)))) {
198 d->d_itimer = 0;
199 }
200 }
201
202 if (!d->d_rtbtimer) {
203 if ((d->d_rtb_softlimit &&
204 (be64_to_cpu(d->d_rtbcount) >
205 be64_to_cpu(d->d_rtb_softlimit))) ||
206 (d->d_rtb_hardlimit &&
207 (be64_to_cpu(d->d_rtbcount) >
208 be64_to_cpu(d->d_rtb_hardlimit)))) {
209 d->d_rtbtimer = cpu_to_be32(get_seconds() +
210 mp->m_quotainfo->qi_rtbtimelimit);
211 } else {
212 d->d_rtbwarns = 0;
213 }
214 } else {
215 if ((!d->d_rtb_softlimit ||
216 (be64_to_cpu(d->d_rtbcount) <=
217 be64_to_cpu(d->d_rtb_softlimit))) &&
218 (!d->d_rtb_hardlimit ||
219 (be64_to_cpu(d->d_rtbcount) <=
220 be64_to_cpu(d->d_rtb_hardlimit)))) {
221 d->d_rtbtimer = 0;
222 }
223 }
224}
225
226/*
227 * initialize a buffer full of dquots and log the whole thing
228 */
229STATIC void
230xfs_qm_init_dquot_blk(
231 xfs_trans_t *tp,
232 xfs_mount_t *mp,
233 xfs_dqid_t id,
234 uint type,
235 xfs_buf_t *bp)
236{
237 struct xfs_quotainfo *q = mp->m_quotainfo;
238 xfs_dqblk_t *d;
239 xfs_dqid_t curid;
240 int i;
241
242 ASSERT(tp);
243 ASSERT(xfs_buf_islocked(bp));
244
245 d = bp->b_addr;
246
247 /*
248 * ID of the first dquot in the block - id's are zero based.
249 */
250 curid = id - (id % q->qi_dqperchunk);
251 memset(d, 0, BBTOB(q->qi_dqchunklen));
252 for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++) {
253 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
254 d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
255 d->dd_diskdq.d_id = cpu_to_be32(curid);
256 d->dd_diskdq.d_flags = type;
257 if (xfs_sb_version_hascrc(&mp->m_sb)) {
258 uuid_copy(&d->dd_uuid, &mp->m_sb.sb_meta_uuid);
259 xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk),
260 XFS_DQUOT_CRC_OFF);
261 }
262 }
263
264 xfs_trans_dquot_buf(tp, bp,
265 (type & XFS_DQ_USER ? XFS_BLF_UDQUOT_BUF :
266 ((type & XFS_DQ_PROJ) ? XFS_BLF_PDQUOT_BUF :
267 XFS_BLF_GDQUOT_BUF)));
268 xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1);
269}
270
271/*
272 * Initialize the dynamic speculative preallocation thresholds. The lo/hi
273 * watermarks correspond to the soft and hard limits by default. If a soft limit
274 * is not specified, we use 95% of the hard limit.
275 */
276void
277xfs_dquot_set_prealloc_limits(struct xfs_dquot *dqp)
278{
279 __uint64_t space;
280
281 dqp->q_prealloc_hi_wmark = be64_to_cpu(dqp->q_core.d_blk_hardlimit);
282 dqp->q_prealloc_lo_wmark = be64_to_cpu(dqp->q_core.d_blk_softlimit);
283 if (!dqp->q_prealloc_lo_wmark) {
284 dqp->q_prealloc_lo_wmark = dqp->q_prealloc_hi_wmark;
285 do_div(dqp->q_prealloc_lo_wmark, 100);
286 dqp->q_prealloc_lo_wmark *= 95;
287 }
288
289 space = dqp->q_prealloc_hi_wmark;
290
291 do_div(space, 100);
292 dqp->q_low_space[XFS_QLOWSP_1_PCNT] = space;
293 dqp->q_low_space[XFS_QLOWSP_3_PCNT] = space * 3;
294 dqp->q_low_space[XFS_QLOWSP_5_PCNT] = space * 5;
295}
296
297/*
298 * Allocate a block and fill it with dquots.
299 * This is called when the bmapi finds a hole.
300 */
301STATIC int
302xfs_qm_dqalloc(
303 xfs_trans_t **tpp,
304 xfs_mount_t *mp,
305 xfs_dquot_t *dqp,
306 xfs_inode_t *quotip,
307 xfs_fileoff_t offset_fsb,
308 xfs_buf_t **O_bpp)
309{
310 xfs_fsblock_t firstblock;
311 struct xfs_defer_ops dfops;
312 xfs_bmbt_irec_t map;
313 int nmaps, error;
314 xfs_buf_t *bp;
315 xfs_trans_t *tp = *tpp;
316
317 ASSERT(tp != NULL);
318
319 trace_xfs_dqalloc(dqp);
320
321 /*
322 * Initialize the bmap freelist prior to calling bmapi code.
323 */
324 xfs_defer_init(&dfops, &firstblock);
325 xfs_ilock(quotip, XFS_ILOCK_EXCL);
326 /*
327 * Return if this type of quotas is turned off while we didn't
328 * have an inode lock
329 */
330 if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
331 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
332 return -ESRCH;
333 }
334
335 xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL);
336 nmaps = 1;
337 error = xfs_bmapi_write(tp, quotip, offset_fsb,
338 XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA,
339 &firstblock, XFS_QM_DQALLOC_SPACE_RES(mp),
340 &map, &nmaps, &dfops);
341 if (error)
342 goto error0;
343 ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
344 ASSERT(nmaps == 1);
345 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
346 (map.br_startblock != HOLESTARTBLOCK));
347
348 /*
349 * Keep track of the blkno to save a lookup later
350 */
351 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
352
353 /* now we can just get the buffer (there's nothing to read yet) */
354 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
355 dqp->q_blkno,
356 mp->m_quotainfo->qi_dqchunklen,
357 0);
358 if (!bp) {
359 error = -ENOMEM;
360 goto error1;
361 }
362 bp->b_ops = &xfs_dquot_buf_ops;
363
364 /*
365 * Make a chunk of dquots out of this buffer and log
366 * the entire thing.
367 */
368 xfs_qm_init_dquot_blk(tp, mp, be32_to_cpu(dqp->q_core.d_id),
369 dqp->dq_flags & XFS_DQ_ALLTYPES, bp);
370
371 /*
372 * xfs_defer_finish() may commit the current transaction and
373 * start a second transaction if the freelist is not empty.
374 *
375 * Since we still want to modify this buffer, we need to
376 * ensure that the buffer is not released on commit of
377 * the first transaction and ensure the buffer is added to the
378 * second transaction.
379 *
380 * If there is only one transaction then don't stop the buffer
381 * from being released when it commits later on.
382 */
383
384 xfs_trans_bhold(tp, bp);
385
386 error = xfs_defer_finish(tpp, &dfops, NULL);
387 if (error)
388 goto error1;
389
390 /* Transaction was committed? */
391 if (*tpp != tp) {
392 tp = *tpp;
393 xfs_trans_bjoin(tp, bp);
394 } else {
395 xfs_trans_bhold_release(tp, bp);
396 }
397
398 *O_bpp = bp;
399 return 0;
400
401error1:
402 xfs_defer_cancel(&dfops);
403error0:
404 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
405
406 return error;
407}
408
409STATIC int
410xfs_qm_dqrepair(
411 struct xfs_mount *mp,
412 struct xfs_trans *tp,
413 struct xfs_dquot *dqp,
414 xfs_dqid_t firstid,
415 struct xfs_buf **bpp)
416{
417 int error;
418 struct xfs_disk_dquot *ddq;
419 struct xfs_dqblk *d;
420 int i;
421
422 /*
423 * Read the buffer without verification so we get the corrupted
424 * buffer returned to us. make sure we verify it on write, though.
425 */
426 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, dqp->q_blkno,
427 mp->m_quotainfo->qi_dqchunklen,
428 0, bpp, NULL);
429
430 if (error) {
431 ASSERT(*bpp == NULL);
432 return error;
433 }
434 (*bpp)->b_ops = &xfs_dquot_buf_ops;
435
436 ASSERT(xfs_buf_islocked(*bpp));
437 d = (struct xfs_dqblk *)(*bpp)->b_addr;
438
439 /* Do the actual repair of dquots in this buffer */
440 for (i = 0; i < mp->m_quotainfo->qi_dqperchunk; i++) {
441 ddq = &d[i].dd_diskdq;
442 error = xfs_dqcheck(mp, ddq, firstid + i,
443 dqp->dq_flags & XFS_DQ_ALLTYPES,
444 XFS_QMOPT_DQREPAIR, "xfs_qm_dqrepair");
445 if (error) {
446 /* repair failed, we're screwed */
447 xfs_trans_brelse(tp, *bpp);
448 return -EIO;
449 }
450 }
451
452 return 0;
453}
454
455/*
456 * Maps a dquot to the buffer containing its on-disk version.
457 * This returns a ptr to the buffer containing the on-disk dquot
458 * in the bpp param, and a ptr to the on-disk dquot within that buffer
459 */
460STATIC int
461xfs_qm_dqtobp(
462 xfs_trans_t **tpp,
463 xfs_dquot_t *dqp,
464 xfs_disk_dquot_t **O_ddpp,
465 xfs_buf_t **O_bpp,
466 uint flags)
467{
468 struct xfs_bmbt_irec map;
469 int nmaps = 1, error;
470 struct xfs_buf *bp;
471 struct xfs_inode *quotip;
472 struct xfs_mount *mp = dqp->q_mount;
473 xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id);
474 struct xfs_trans *tp = (tpp ? *tpp : NULL);
475 uint lock_mode;
476
477 quotip = xfs_quota_inode(dqp->q_mount, dqp->dq_flags);
478 dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;
479
480 lock_mode = xfs_ilock_data_map_shared(quotip);
481 if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
482 /*
483 * Return if this type of quotas is turned off while we
484 * didn't have the quota inode lock.
485 */
486 xfs_iunlock(quotip, lock_mode);
487 return -ESRCH;
488 }
489
490 /*
491 * Find the block map; no allocations yet
492 */
493 error = xfs_bmapi_read(quotip, dqp->q_fileoffset,
494 XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0);
495
496 xfs_iunlock(quotip, lock_mode);
497 if (error)
498 return error;
499
500 ASSERT(nmaps == 1);
501 ASSERT(map.br_blockcount == 1);
502
503 /*
504 * Offset of dquot in the (fixed sized) dquot chunk.
505 */
506 dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) *
507 sizeof(xfs_dqblk_t);
508
509 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
510 if (map.br_startblock == HOLESTARTBLOCK) {
511 /*
512 * We don't allocate unless we're asked to
513 */
514 if (!(flags & XFS_QMOPT_DQALLOC))
515 return -ENOENT;
516
517 ASSERT(tp);
518 error = xfs_qm_dqalloc(tpp, mp, dqp, quotip,
519 dqp->q_fileoffset, &bp);
520 if (error)
521 return error;
522 tp = *tpp;
523 } else {
524 trace_xfs_dqtobp_read(dqp);
525
526 /*
527 * store the blkno etc so that we don't have to do the
528 * mapping all the time
529 */
530 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
531
532 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
533 dqp->q_blkno,
534 mp->m_quotainfo->qi_dqchunklen,
535 0, &bp, &xfs_dquot_buf_ops);
536
537 if (error == -EFSCORRUPTED && (flags & XFS_QMOPT_DQREPAIR)) {
538 xfs_dqid_t firstid = (xfs_dqid_t)map.br_startoff *
539 mp->m_quotainfo->qi_dqperchunk;
540 ASSERT(bp == NULL);
541 error = xfs_qm_dqrepair(mp, tp, dqp, firstid, &bp);
542 }
543
544 if (error) {
545 ASSERT(bp == NULL);
546 return error;
547 }
548 }
549
550 ASSERT(xfs_buf_islocked(bp));
551 *O_bpp = bp;
552 *O_ddpp = bp->b_addr + dqp->q_bufoffset;
553
554 return 0;
555}
556
557
558/*
559 * Read in the ondisk dquot using dqtobp() then copy it to an incore version,
560 * and release the buffer immediately.
561 *
562 * If XFS_QMOPT_DQALLOC is set, allocate a dquot on disk if it needed.
563 */
564int
565xfs_qm_dqread(
566 struct xfs_mount *mp,
567 xfs_dqid_t id,
568 uint type,
569 uint flags,
570 struct xfs_dquot **O_dqpp)
571{
572 struct xfs_dquot *dqp;
573 struct xfs_disk_dquot *ddqp;
574 struct xfs_buf *bp;
575 struct xfs_trans *tp = NULL;
576 int error;
577
578 dqp = kmem_zone_zalloc(xfs_qm_dqzone, KM_SLEEP);
579
580 dqp->dq_flags = type;
581 dqp->q_core.d_id = cpu_to_be32(id);
582 dqp->q_mount = mp;
583 INIT_LIST_HEAD(&dqp->q_lru);
584 mutex_init(&dqp->q_qlock);
585 init_waitqueue_head(&dqp->q_pinwait);
586
587 /*
588 * Because we want to use a counting completion, complete
589 * the flush completion once to allow a single access to
590 * the flush completion without blocking.
591 */
592 init_completion(&dqp->q_flush);
593 complete(&dqp->q_flush);
594
595 /*
596 * Make sure group quotas have a different lock class than user
597 * quotas.
598 */
599 switch (type) {
600 case XFS_DQ_USER:
601 /* uses the default lock class */
602 break;
603 case XFS_DQ_GROUP:
604 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_group_class);
605 break;
606 case XFS_DQ_PROJ:
607 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_project_class);
608 break;
609 default:
610 ASSERT(0);
611 break;
612 }
613
614 XFS_STATS_INC(mp, xs_qm_dquot);
615
616 trace_xfs_dqread(dqp);
617
618 if (flags & XFS_QMOPT_DQALLOC) {
619 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_dqalloc,
620 XFS_QM_DQALLOC_SPACE_RES(mp), 0, 0, &tp);
621 if (error)
622 goto error0;
623 }
624
625 /*
626 * get a pointer to the on-disk dquot and the buffer containing it
627 * dqp already knows its own type (GROUP/USER).
628 */
629 error = xfs_qm_dqtobp(&tp, dqp, &ddqp, &bp, flags);
630 if (error) {
631 /*
632 * This can happen if quotas got turned off (ESRCH),
633 * or if the dquot didn't exist on disk and we ask to
634 * allocate (ENOENT).
635 */
636 trace_xfs_dqread_fail(dqp);
637 goto error1;
638 }
639
640 /* copy everything from disk dquot to the incore dquot */
641 memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t));
642 xfs_qm_dquot_logitem_init(dqp);
643
644 /*
645 * Reservation counters are defined as reservation plus current usage
646 * to avoid having to add every time.
647 */
648 dqp->q_res_bcount = be64_to_cpu(ddqp->d_bcount);
649 dqp->q_res_icount = be64_to_cpu(ddqp->d_icount);
650 dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount);
651
652 /* initialize the dquot speculative prealloc thresholds */
653 xfs_dquot_set_prealloc_limits(dqp);
654
655 /* Mark the buf so that this will stay incore a little longer */
656 xfs_buf_set_ref(bp, XFS_DQUOT_REF);
657
658 /*
659 * We got the buffer with a xfs_trans_read_buf() (in dqtobp())
660 * So we need to release with xfs_trans_brelse().
661 * The strategy here is identical to that of inodes; we lock
662 * the dquot in xfs_qm_dqget() before making it accessible to
663 * others. This is because dquots, like inodes, need a good level of
664 * concurrency, and we don't want to take locks on the entire buffers
665 * for dquot accesses.
666 * Note also that the dquot buffer may even be dirty at this point, if
667 * this particular dquot was repaired. We still aren't afraid to
668 * brelse it because we have the changes incore.
669 */
670 ASSERT(xfs_buf_islocked(bp));
671 xfs_trans_brelse(tp, bp);
672
673 if (tp) {
674 error = xfs_trans_commit(tp);
675 if (error)
676 goto error0;
677 }
678
679 *O_dqpp = dqp;
680 return error;
681
682error1:
683 if (tp)
684 xfs_trans_cancel(tp);
685error0:
686 xfs_qm_dqdestroy(dqp);
687 *O_dqpp = NULL;
688 return error;
689}
690
691/*
692 * Advance to the next id in the current chunk, or if at the
693 * end of the chunk, skip ahead to first id in next allocated chunk
694 * using the SEEK_DATA interface.
695 */
696static int
697xfs_dq_get_next_id(
698 xfs_mount_t *mp,
699 uint type,
700 xfs_dqid_t *id,
701 loff_t eof)
702{
703 struct xfs_inode *quotip;
704 xfs_fsblock_t start;
705 loff_t offset;
706 uint lock;
707 xfs_dqid_t next_id;
708 int error = 0;
709
710 /* Simple advance */
711 next_id = *id + 1;
712
713 /* If we'd wrap past the max ID, stop */
714 if (next_id < *id)
715 return -ENOENT;
716
717 /* If new ID is within the current chunk, advancing it sufficed */
718 if (next_id % mp->m_quotainfo->qi_dqperchunk) {
719 *id = next_id;
720 return 0;
721 }
722
723 /* Nope, next_id is now past the current chunk, so find the next one */
724 start = (xfs_fsblock_t)next_id / mp->m_quotainfo->qi_dqperchunk;
725
726 quotip = xfs_quota_inode(mp, type);
727 lock = xfs_ilock_data_map_shared(quotip);
728
729 offset = __xfs_seek_hole_data(VFS_I(quotip), XFS_FSB_TO_B(mp, start),
730 eof, SEEK_DATA);
731 if (offset < 0)
732 error = offset;
733
734 xfs_iunlock(quotip, lock);
735
736 /* -ENXIO is essentially "no more data" */
737 if (error)
738 return (error == -ENXIO ? -ENOENT: error);
739
740 /* Convert next data offset back to a quota id */
741 *id = XFS_B_TO_FSB(mp, offset) * mp->m_quotainfo->qi_dqperchunk;
742 return 0;
743}
744
745/*
746 * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a
747 * a locked dquot, doing an allocation (if requested) as needed.
748 * When both an inode and an id are given, the inode's id takes precedence.
749 * That is, if the id changes while we don't hold the ilock inside this
750 * function, the new dquot is returned, not necessarily the one requested
751 * in the id argument.
752 */
753int
754xfs_qm_dqget(
755 xfs_mount_t *mp,
756 xfs_inode_t *ip, /* locked inode (optional) */
757 xfs_dqid_t id, /* uid/projid/gid depending on type */
758 uint type, /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */
759 uint flags, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
760 xfs_dquot_t **O_dqpp) /* OUT : locked incore dquot */
761{
762 struct xfs_quotainfo *qi = mp->m_quotainfo;
763 struct radix_tree_root *tree = xfs_dquot_tree(qi, type);
764 struct xfs_dquot *dqp;
765 loff_t eof = 0;
766 int error;
767
768 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
769 if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) ||
770 (! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) ||
771 (! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) {
772 return -ESRCH;
773 }
774
775#ifdef DEBUG
776 if (xfs_do_dqerror) {
777 if ((xfs_dqerror_target == mp->m_ddev_targp) &&
778 (xfs_dqreq_num++ % xfs_dqerror_mod) == 0) {
779 xfs_debug(mp, "Returning error in dqget");
780 return -EIO;
781 }
782 }
783
784 ASSERT(type == XFS_DQ_USER ||
785 type == XFS_DQ_PROJ ||
786 type == XFS_DQ_GROUP);
787 if (ip) {
788 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
789 ASSERT(xfs_inode_dquot(ip, type) == NULL);
790 }
791#endif
792
793 /* Get the end of the quota file if we need it */
794 if (flags & XFS_QMOPT_DQNEXT) {
795 struct xfs_inode *quotip;
796 xfs_fileoff_t last;
797 uint lock_mode;
798
799 quotip = xfs_quota_inode(mp, type);
800 lock_mode = xfs_ilock_data_map_shared(quotip);
801 error = xfs_bmap_last_offset(quotip, &last, XFS_DATA_FORK);
802 xfs_iunlock(quotip, lock_mode);
803 if (error)
804 return error;
805 eof = XFS_FSB_TO_B(mp, last);
806 }
807
808restart:
809 mutex_lock(&qi->qi_tree_lock);
810 dqp = radix_tree_lookup(tree, id);
811 if (dqp) {
812 xfs_dqlock(dqp);
813 if (dqp->dq_flags & XFS_DQ_FREEING) {
814 xfs_dqunlock(dqp);
815 mutex_unlock(&qi->qi_tree_lock);
816 trace_xfs_dqget_freeing(dqp);
817 delay(1);
818 goto restart;
819 }
820
821 /* uninit / unused quota found in radix tree, keep looking */
822 if (flags & XFS_QMOPT_DQNEXT) {
823 if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
824 xfs_dqunlock(dqp);
825 mutex_unlock(&qi->qi_tree_lock);
826 error = xfs_dq_get_next_id(mp, type, &id, eof);
827 if (error)
828 return error;
829 goto restart;
830 }
831 }
832
833 dqp->q_nrefs++;
834 mutex_unlock(&qi->qi_tree_lock);
835
836 trace_xfs_dqget_hit(dqp);
837 XFS_STATS_INC(mp, xs_qm_dqcachehits);
838 *O_dqpp = dqp;
839 return 0;
840 }
841 mutex_unlock(&qi->qi_tree_lock);
842 XFS_STATS_INC(mp, xs_qm_dqcachemisses);
843
844 /*
845 * Dquot cache miss. We don't want to keep the inode lock across
846 * a (potential) disk read. Also we don't want to deal with the lock
847 * ordering between quotainode and this inode. OTOH, dropping the inode
848 * lock here means dealing with a chown that can happen before
849 * we re-acquire the lock.
850 */
851 if (ip)
852 xfs_iunlock(ip, XFS_ILOCK_EXCL);
853
854 error = xfs_qm_dqread(mp, id, type, flags, &dqp);
855
856 if (ip)
857 xfs_ilock(ip, XFS_ILOCK_EXCL);
858
859 /* If we are asked to find next active id, keep looking */
860 if (error == -ENOENT && (flags & XFS_QMOPT_DQNEXT)) {
861 error = xfs_dq_get_next_id(mp, type, &id, eof);
862 if (!error)
863 goto restart;
864 }
865
866 if (error)
867 return error;
868
869 if (ip) {
870 /*
871 * A dquot could be attached to this inode by now, since
872 * we had dropped the ilock.
873 */
874 if (xfs_this_quota_on(mp, type)) {
875 struct xfs_dquot *dqp1;
876
877 dqp1 = xfs_inode_dquot(ip, type);
878 if (dqp1) {
879 xfs_qm_dqdestroy(dqp);
880 dqp = dqp1;
881 xfs_dqlock(dqp);
882 goto dqret;
883 }
884 } else {
885 /* inode stays locked on return */
886 xfs_qm_dqdestroy(dqp);
887 return -ESRCH;
888 }
889 }
890
891 mutex_lock(&qi->qi_tree_lock);
892 error = radix_tree_insert(tree, id, dqp);
893 if (unlikely(error)) {
894 WARN_ON(error != -EEXIST);
895
896 /*
897 * Duplicate found. Just throw away the new dquot and start
898 * over.
899 */
900 mutex_unlock(&qi->qi_tree_lock);
901 trace_xfs_dqget_dup(dqp);
902 xfs_qm_dqdestroy(dqp);
903 XFS_STATS_INC(mp, xs_qm_dquot_dups);
904 goto restart;
905 }
906
907 /*
908 * We return a locked dquot to the caller, with a reference taken
909 */
910 xfs_dqlock(dqp);
911 dqp->q_nrefs = 1;
912
913 qi->qi_dquots++;
914 mutex_unlock(&qi->qi_tree_lock);
915
916 /* If we are asked to find next active id, keep looking */
917 if (flags & XFS_QMOPT_DQNEXT) {
918 if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
919 xfs_qm_dqput(dqp);
920 error = xfs_dq_get_next_id(mp, type, &id, eof);
921 if (error)
922 return error;
923 goto restart;
924 }
925 }
926
927 dqret:
928 ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL));
929 trace_xfs_dqget_miss(dqp);
930 *O_dqpp = dqp;
931 return 0;
932}
933
934/*
935 * Release a reference to the dquot (decrement ref-count) and unlock it.
936 *
937 * If there is a group quota attached to this dquot, carefully release that
938 * too without tripping over deadlocks'n'stuff.
939 */
940void
941xfs_qm_dqput(
942 struct xfs_dquot *dqp)
943{
944 ASSERT(dqp->q_nrefs > 0);
945 ASSERT(XFS_DQ_IS_LOCKED(dqp));
946
947 trace_xfs_dqput(dqp);
948
949 if (--dqp->q_nrefs == 0) {
950 struct xfs_quotainfo *qi = dqp->q_mount->m_quotainfo;
951 trace_xfs_dqput_free(dqp);
952
953 if (list_lru_add(&qi->qi_lru, &dqp->q_lru))
954 XFS_STATS_INC(dqp->q_mount, xs_qm_dquot_unused);
955 }
956 xfs_dqunlock(dqp);
957}
958
959/*
960 * Release a dquot. Flush it if dirty, then dqput() it.
961 * dquot must not be locked.
962 */
963void
964xfs_qm_dqrele(
965 xfs_dquot_t *dqp)
966{
967 if (!dqp)
968 return;
969
970 trace_xfs_dqrele(dqp);
971
972 xfs_dqlock(dqp);
973 /*
974 * We don't care to flush it if the dquot is dirty here.
975 * That will create stutters that we want to avoid.
976 * Instead we do a delayed write when we try to reclaim
977 * a dirty dquot. Also xfs_sync will take part of the burden...
978 */
979 xfs_qm_dqput(dqp);
980}
981
982/*
983 * This is the dquot flushing I/O completion routine. It is called
984 * from interrupt level when the buffer containing the dquot is
985 * flushed to disk. It is responsible for removing the dquot logitem
986 * from the AIL if it has not been re-logged, and unlocking the dquot's
987 * flush lock. This behavior is very similar to that of inodes..
988 */
989STATIC void
990xfs_qm_dqflush_done(
991 struct xfs_buf *bp,
992 struct xfs_log_item *lip)
993{
994 xfs_dq_logitem_t *qip = (struct xfs_dq_logitem *)lip;
995 xfs_dquot_t *dqp = qip->qli_dquot;
996 struct xfs_ail *ailp = lip->li_ailp;
997
998 /*
999 * We only want to pull the item from the AIL if its
1000 * location in the log has not changed since we started the flush.
1001 * Thus, we only bother if the dquot's lsn has
1002 * not changed. First we check the lsn outside the lock
1003 * since it's cheaper, and then we recheck while
1004 * holding the lock before removing the dquot from the AIL.
1005 */
1006 if ((lip->li_flags & XFS_LI_IN_AIL) &&
1007 lip->li_lsn == qip->qli_flush_lsn) {
1008
1009 /* xfs_trans_ail_delete() drops the AIL lock. */
1010 spin_lock(&ailp->xa_lock);
1011 if (lip->li_lsn == qip->qli_flush_lsn)
1012 xfs_trans_ail_delete(ailp, lip, SHUTDOWN_CORRUPT_INCORE);
1013 else
1014 spin_unlock(&ailp->xa_lock);
1015 }
1016
1017 /*
1018 * Release the dq's flush lock since we're done with it.
1019 */
1020 xfs_dqfunlock(dqp);
1021}
1022
1023/*
1024 * Write a modified dquot to disk.
1025 * The dquot must be locked and the flush lock too taken by caller.
1026 * The flush lock will not be unlocked until the dquot reaches the disk,
1027 * but the dquot is free to be unlocked and modified by the caller
1028 * in the interim. Dquot is still locked on return. This behavior is
1029 * identical to that of inodes.
1030 */
1031int
1032xfs_qm_dqflush(
1033 struct xfs_dquot *dqp,
1034 struct xfs_buf **bpp)
1035{
1036 struct xfs_mount *mp = dqp->q_mount;
1037 struct xfs_buf *bp;
1038 struct xfs_disk_dquot *ddqp;
1039 int error;
1040
1041 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1042 ASSERT(!completion_done(&dqp->q_flush));
1043
1044 trace_xfs_dqflush(dqp);
1045
1046 *bpp = NULL;
1047
1048 xfs_qm_dqunpin_wait(dqp);
1049
1050 /*
1051 * This may have been unpinned because the filesystem is shutting
1052 * down forcibly. If that's the case we must not write this dquot
1053 * to disk, because the log record didn't make it to disk.
1054 *
1055 * We also have to remove the log item from the AIL in this case,
1056 * as we wait for an emptry AIL as part of the unmount process.
1057 */
1058 if (XFS_FORCED_SHUTDOWN(mp)) {
1059 struct xfs_log_item *lip = &dqp->q_logitem.qli_item;
1060 dqp->dq_flags &= ~XFS_DQ_DIRTY;
1061
1062 xfs_trans_ail_remove(lip, SHUTDOWN_CORRUPT_INCORE);
1063
1064 error = -EIO;
1065 goto out_unlock;
1066 }
1067
1068 /*
1069 * Get the buffer containing the on-disk dquot
1070 */
1071 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
1072 mp->m_quotainfo->qi_dqchunklen, 0, &bp,
1073 &xfs_dquot_buf_ops);
1074 if (error)
1075 goto out_unlock;
1076
1077 /*
1078 * Calculate the location of the dquot inside the buffer.
1079 */
1080 ddqp = bp->b_addr + dqp->q_bufoffset;
1081
1082 /*
1083 * A simple sanity check in case we got a corrupted dquot..
1084 */
1085 error = xfs_dqcheck(mp, &dqp->q_core, be32_to_cpu(ddqp->d_id), 0,
1086 XFS_QMOPT_DOWARN, "dqflush (incore copy)");
1087 if (error) {
1088 xfs_buf_relse(bp);
1089 xfs_dqfunlock(dqp);
1090 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1091 return -EIO;
1092 }
1093
1094 /* This is the only portion of data that needs to persist */
1095 memcpy(ddqp, &dqp->q_core, sizeof(xfs_disk_dquot_t));
1096
1097 /*
1098 * Clear the dirty field and remember the flush lsn for later use.
1099 */
1100 dqp->dq_flags &= ~XFS_DQ_DIRTY;
1101
1102 xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn,
1103 &dqp->q_logitem.qli_item.li_lsn);
1104
1105 /*
1106 * copy the lsn into the on-disk dquot now while we have the in memory
1107 * dquot here. This can't be done later in the write verifier as we
1108 * can't get access to the log item at that point in time.
1109 *
1110 * We also calculate the CRC here so that the on-disk dquot in the
1111 * buffer always has a valid CRC. This ensures there is no possibility
1112 * of a dquot without an up-to-date CRC getting to disk.
1113 */
1114 if (xfs_sb_version_hascrc(&mp->m_sb)) {
1115 struct xfs_dqblk *dqb = (struct xfs_dqblk *)ddqp;
1116
1117 dqb->dd_lsn = cpu_to_be64(dqp->q_logitem.qli_item.li_lsn);
1118 xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk),
1119 XFS_DQUOT_CRC_OFF);
1120 }
1121
1122 /*
1123 * Attach an iodone routine so that we can remove this dquot from the
1124 * AIL and release the flush lock once the dquot is synced to disk.
1125 */
1126 xfs_buf_attach_iodone(bp, xfs_qm_dqflush_done,
1127 &dqp->q_logitem.qli_item);
1128
1129 /*
1130 * If the buffer is pinned then push on the log so we won't
1131 * get stuck waiting in the write for too long.
1132 */
1133 if (xfs_buf_ispinned(bp)) {
1134 trace_xfs_dqflush_force(dqp);
1135 xfs_log_force(mp, 0);
1136 }
1137
1138 trace_xfs_dqflush_done(dqp);
1139 *bpp = bp;
1140 return 0;
1141
1142out_unlock:
1143 xfs_dqfunlock(dqp);
1144 return -EIO;
1145}
1146
1147/*
1148 * Lock two xfs_dquot structures.
1149 *
1150 * To avoid deadlocks we always lock the quota structure with
1151 * the lowerd id first.
1152 */
1153void
1154xfs_dqlock2(
1155 xfs_dquot_t *d1,
1156 xfs_dquot_t *d2)
1157{
1158 if (d1 && d2) {
1159 ASSERT(d1 != d2);
1160 if (be32_to_cpu(d1->q_core.d_id) >
1161 be32_to_cpu(d2->q_core.d_id)) {
1162 mutex_lock(&d2->q_qlock);
1163 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
1164 } else {
1165 mutex_lock(&d1->q_qlock);
1166 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
1167 }
1168 } else if (d1) {
1169 mutex_lock(&d1->q_qlock);
1170 } else if (d2) {
1171 mutex_lock(&d2->q_qlock);
1172 }
1173}
1174
1175int __init
1176xfs_qm_init(void)
1177{
1178 xfs_qm_dqzone =
1179 kmem_zone_init(sizeof(struct xfs_dquot), "xfs_dquot");
1180 if (!xfs_qm_dqzone)
1181 goto out;
1182
1183 xfs_qm_dqtrxzone =
1184 kmem_zone_init(sizeof(struct xfs_dquot_acct), "xfs_dqtrx");
1185 if (!xfs_qm_dqtrxzone)
1186 goto out_free_dqzone;
1187
1188 return 0;
1189
1190out_free_dqzone:
1191 kmem_zone_destroy(xfs_qm_dqzone);
1192out:
1193 return -ENOMEM;
1194}
1195
1196void
1197xfs_qm_exit(void)
1198{
1199 kmem_zone_destroy(xfs_qm_dqtrxzone);
1200 kmem_zone_destroy(xfs_qm_dqzone);
1201}