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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_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
56struct kmem_zone *xfs_qm_dqtrxzone;
57static struct kmem_zone *xfs_qm_dqzone;
58
59static struct lock_class_key xfs_dquot_group_class;
60static struct lock_class_key xfs_dquot_project_class;
61
62/*
63 * This is called to free all the memory associated with a dquot
64 */
65void
66xfs_qm_dqdestroy(
67 xfs_dquot_t *dqp)
68{
69 ASSERT(list_empty(&dqp->q_lru));
70
71 kmem_free(dqp->q_logitem.qli_item.li_lv_shadow);
72 mutex_destroy(&dqp->q_qlock);
73
74 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot);
75 kmem_zone_free(xfs_qm_dqzone, dqp);
76}
77
78/*
79 * If default limits are in force, push them into the dquot now.
80 * We overwrite the dquot limits only if they are zero and this
81 * is not the root dquot.
82 */
83void
84xfs_qm_adjust_dqlimits(
85 struct xfs_mount *mp,
86 struct xfs_dquot *dq)
87{
88 struct xfs_quotainfo *q = mp->m_quotainfo;
89 struct xfs_disk_dquot *d = &dq->q_core;
90 struct xfs_def_quota *defq;
91 int prealloc = 0;
92
93 ASSERT(d->d_id);
94 defq = xfs_get_defquota(dq, q);
95
96 if (defq->bsoftlimit && !d->d_blk_softlimit) {
97 d->d_blk_softlimit = cpu_to_be64(defq->bsoftlimit);
98 prealloc = 1;
99 }
100 if (defq->bhardlimit && !d->d_blk_hardlimit) {
101 d->d_blk_hardlimit = cpu_to_be64(defq->bhardlimit);
102 prealloc = 1;
103 }
104 if (defq->isoftlimit && !d->d_ino_softlimit)
105 d->d_ino_softlimit = cpu_to_be64(defq->isoftlimit);
106 if (defq->ihardlimit && !d->d_ino_hardlimit)
107 d->d_ino_hardlimit = cpu_to_be64(defq->ihardlimit);
108 if (defq->rtbsoftlimit && !d->d_rtb_softlimit)
109 d->d_rtb_softlimit = cpu_to_be64(defq->rtbsoftlimit);
110 if (defq->rtbhardlimit && !d->d_rtb_hardlimit)
111 d->d_rtb_hardlimit = cpu_to_be64(defq->rtbhardlimit);
112
113 if (prealloc)
114 xfs_dquot_set_prealloc_limits(dq);
115}
116
117/*
118 * Check the limits and timers of a dquot and start or reset timers
119 * if necessary.
120 * This gets called even when quota enforcement is OFF, which makes our
121 * life a little less complicated. (We just don't reject any quota
122 * reservations in that case, when enforcement is off).
123 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when
124 * enforcement's off.
125 * In contrast, warnings are a little different in that they don't
126 * 'automatically' get started when limits get exceeded. They do
127 * get reset to zero, however, when we find the count to be under
128 * the soft limit (they are only ever set non-zero via userspace).
129 */
130void
131xfs_qm_adjust_dqtimers(
132 xfs_mount_t *mp,
133 xfs_disk_dquot_t *d)
134{
135 ASSERT(d->d_id);
136
137#ifdef DEBUG
138 if (d->d_blk_hardlimit)
139 ASSERT(be64_to_cpu(d->d_blk_softlimit) <=
140 be64_to_cpu(d->d_blk_hardlimit));
141 if (d->d_ino_hardlimit)
142 ASSERT(be64_to_cpu(d->d_ino_softlimit) <=
143 be64_to_cpu(d->d_ino_hardlimit));
144 if (d->d_rtb_hardlimit)
145 ASSERT(be64_to_cpu(d->d_rtb_softlimit) <=
146 be64_to_cpu(d->d_rtb_hardlimit));
147#endif
148
149 if (!d->d_btimer) {
150 if ((d->d_blk_softlimit &&
151 (be64_to_cpu(d->d_bcount) >
152 be64_to_cpu(d->d_blk_softlimit))) ||
153 (d->d_blk_hardlimit &&
154 (be64_to_cpu(d->d_bcount) >
155 be64_to_cpu(d->d_blk_hardlimit)))) {
156 d->d_btimer = cpu_to_be32(get_seconds() +
157 mp->m_quotainfo->qi_btimelimit);
158 } else {
159 d->d_bwarns = 0;
160 }
161 } else {
162 if ((!d->d_blk_softlimit ||
163 (be64_to_cpu(d->d_bcount) <=
164 be64_to_cpu(d->d_blk_softlimit))) &&
165 (!d->d_blk_hardlimit ||
166 (be64_to_cpu(d->d_bcount) <=
167 be64_to_cpu(d->d_blk_hardlimit)))) {
168 d->d_btimer = 0;
169 }
170 }
171
172 if (!d->d_itimer) {
173 if ((d->d_ino_softlimit &&
174 (be64_to_cpu(d->d_icount) >
175 be64_to_cpu(d->d_ino_softlimit))) ||
176 (d->d_ino_hardlimit &&
177 (be64_to_cpu(d->d_icount) >
178 be64_to_cpu(d->d_ino_hardlimit)))) {
179 d->d_itimer = cpu_to_be32(get_seconds() +
180 mp->m_quotainfo->qi_itimelimit);
181 } else {
182 d->d_iwarns = 0;
183 }
184 } else {
185 if ((!d->d_ino_softlimit ||
186 (be64_to_cpu(d->d_icount) <=
187 be64_to_cpu(d->d_ino_softlimit))) &&
188 (!d->d_ino_hardlimit ||
189 (be64_to_cpu(d->d_icount) <=
190 be64_to_cpu(d->d_ino_hardlimit)))) {
191 d->d_itimer = 0;
192 }
193 }
194
195 if (!d->d_rtbtimer) {
196 if ((d->d_rtb_softlimit &&
197 (be64_to_cpu(d->d_rtbcount) >
198 be64_to_cpu(d->d_rtb_softlimit))) ||
199 (d->d_rtb_hardlimit &&
200 (be64_to_cpu(d->d_rtbcount) >
201 be64_to_cpu(d->d_rtb_hardlimit)))) {
202 d->d_rtbtimer = cpu_to_be32(get_seconds() +
203 mp->m_quotainfo->qi_rtbtimelimit);
204 } else {
205 d->d_rtbwarns = 0;
206 }
207 } else {
208 if ((!d->d_rtb_softlimit ||
209 (be64_to_cpu(d->d_rtbcount) <=
210 be64_to_cpu(d->d_rtb_softlimit))) &&
211 (!d->d_rtb_hardlimit ||
212 (be64_to_cpu(d->d_rtbcount) <=
213 be64_to_cpu(d->d_rtb_hardlimit)))) {
214 d->d_rtbtimer = 0;
215 }
216 }
217}
218
219/*
220 * initialize a buffer full of dquots and log the whole thing
221 */
222STATIC void
223xfs_qm_init_dquot_blk(
224 xfs_trans_t *tp,
225 xfs_mount_t *mp,
226 xfs_dqid_t id,
227 uint type,
228 xfs_buf_t *bp)
229{
230 struct xfs_quotainfo *q = mp->m_quotainfo;
231 xfs_dqblk_t *d;
232 xfs_dqid_t curid;
233 int i;
234
235 ASSERT(tp);
236 ASSERT(xfs_buf_islocked(bp));
237
238 d = bp->b_addr;
239
240 /*
241 * ID of the first dquot in the block - id's are zero based.
242 */
243 curid = id - (id % q->qi_dqperchunk);
244 memset(d, 0, BBTOB(q->qi_dqchunklen));
245 for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++) {
246 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
247 d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
248 d->dd_diskdq.d_id = cpu_to_be32(curid);
249 d->dd_diskdq.d_flags = type;
250 if (xfs_sb_version_hascrc(&mp->m_sb)) {
251 uuid_copy(&d->dd_uuid, &mp->m_sb.sb_meta_uuid);
252 xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk),
253 XFS_DQUOT_CRC_OFF);
254 }
255 }
256
257 xfs_trans_dquot_buf(tp, bp,
258 (type & XFS_DQ_USER ? XFS_BLF_UDQUOT_BUF :
259 ((type & XFS_DQ_PROJ) ? XFS_BLF_PDQUOT_BUF :
260 XFS_BLF_GDQUOT_BUF)));
261 xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1);
262}
263
264/*
265 * Initialize the dynamic speculative preallocation thresholds. The lo/hi
266 * watermarks correspond to the soft and hard limits by default. If a soft limit
267 * is not specified, we use 95% of the hard limit.
268 */
269void
270xfs_dquot_set_prealloc_limits(struct xfs_dquot *dqp)
271{
272 uint64_t space;
273
274 dqp->q_prealloc_hi_wmark = be64_to_cpu(dqp->q_core.d_blk_hardlimit);
275 dqp->q_prealloc_lo_wmark = be64_to_cpu(dqp->q_core.d_blk_softlimit);
276 if (!dqp->q_prealloc_lo_wmark) {
277 dqp->q_prealloc_lo_wmark = dqp->q_prealloc_hi_wmark;
278 do_div(dqp->q_prealloc_lo_wmark, 100);
279 dqp->q_prealloc_lo_wmark *= 95;
280 }
281
282 space = dqp->q_prealloc_hi_wmark;
283
284 do_div(space, 100);
285 dqp->q_low_space[XFS_QLOWSP_1_PCNT] = space;
286 dqp->q_low_space[XFS_QLOWSP_3_PCNT] = space * 3;
287 dqp->q_low_space[XFS_QLOWSP_5_PCNT] = space * 5;
288}
289
290/*
291 * Allocate a block and fill it with dquots.
292 * This is called when the bmapi finds a hole.
293 */
294STATIC int
295xfs_qm_dqalloc(
296 xfs_trans_t **tpp,
297 xfs_mount_t *mp,
298 xfs_dquot_t *dqp,
299 xfs_inode_t *quotip,
300 xfs_fileoff_t offset_fsb,
301 xfs_buf_t **O_bpp)
302{
303 xfs_fsblock_t firstblock;
304 struct xfs_defer_ops dfops;
305 xfs_bmbt_irec_t map;
306 int nmaps, error;
307 xfs_buf_t *bp;
308 xfs_trans_t *tp = *tpp;
309
310 ASSERT(tp != NULL);
311
312 trace_xfs_dqalloc(dqp);
313
314 /*
315 * Initialize the bmap freelist prior to calling bmapi code.
316 */
317 xfs_defer_init(&dfops, &firstblock);
318 xfs_ilock(quotip, XFS_ILOCK_EXCL);
319 /*
320 * Return if this type of quotas is turned off while we didn't
321 * have an inode lock
322 */
323 if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
324 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
325 return -ESRCH;
326 }
327
328 xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL);
329 nmaps = 1;
330 error = xfs_bmapi_write(tp, quotip, offset_fsb,
331 XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA,
332 &firstblock, XFS_QM_DQALLOC_SPACE_RES(mp),
333 &map, &nmaps, &dfops);
334 if (error)
335 goto error0;
336 ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
337 ASSERT(nmaps == 1);
338 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
339 (map.br_startblock != HOLESTARTBLOCK));
340
341 /*
342 * Keep track of the blkno to save a lookup later
343 */
344 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
345
346 /* now we can just get the buffer (there's nothing to read yet) */
347 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
348 dqp->q_blkno,
349 mp->m_quotainfo->qi_dqchunklen,
350 0);
351 if (!bp) {
352 error = -ENOMEM;
353 goto error1;
354 }
355 bp->b_ops = &xfs_dquot_buf_ops;
356
357 /*
358 * Make a chunk of dquots out of this buffer and log
359 * the entire thing.
360 */
361 xfs_qm_init_dquot_blk(tp, mp, be32_to_cpu(dqp->q_core.d_id),
362 dqp->dq_flags & XFS_DQ_ALLTYPES, bp);
363
364 /*
365 * xfs_defer_finish() may commit the current transaction and
366 * start a second transaction if the freelist is not empty.
367 *
368 * Since we still want to modify this buffer, we need to
369 * ensure that the buffer is not released on commit of
370 * the first transaction and ensure the buffer is added to the
371 * second transaction.
372 *
373 * If there is only one transaction then don't stop the buffer
374 * from being released when it commits later on.
375 */
376
377 xfs_trans_bhold(tp, bp);
378
379 error = xfs_defer_finish(tpp, &dfops);
380 if (error)
381 goto error1;
382
383 /* Transaction was committed? */
384 if (*tpp != tp) {
385 tp = *tpp;
386 xfs_trans_bjoin(tp, bp);
387 } else {
388 xfs_trans_bhold_release(tp, bp);
389 }
390
391 *O_bpp = bp;
392 return 0;
393
394error1:
395 xfs_defer_cancel(&dfops);
396error0:
397 return error;
398}
399
400/*
401 * Maps a dquot to the buffer containing its on-disk version.
402 * This returns a ptr to the buffer containing the on-disk dquot
403 * in the bpp param, and a ptr to the on-disk dquot within that buffer
404 */
405STATIC int
406xfs_qm_dqtobp(
407 xfs_trans_t **tpp,
408 xfs_dquot_t *dqp,
409 xfs_disk_dquot_t **O_ddpp,
410 xfs_buf_t **O_bpp,
411 uint flags)
412{
413 struct xfs_bmbt_irec map;
414 int nmaps = 1, error;
415 struct xfs_buf *bp;
416 struct xfs_inode *quotip;
417 struct xfs_mount *mp = dqp->q_mount;
418 xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id);
419 struct xfs_trans *tp = (tpp ? *tpp : NULL);
420 uint lock_mode;
421
422 quotip = xfs_quota_inode(dqp->q_mount, dqp->dq_flags);
423 dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;
424
425 lock_mode = xfs_ilock_data_map_shared(quotip);
426 if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
427 /*
428 * Return if this type of quotas is turned off while we
429 * didn't have the quota inode lock.
430 */
431 xfs_iunlock(quotip, lock_mode);
432 return -ESRCH;
433 }
434
435 /*
436 * Find the block map; no allocations yet
437 */
438 error = xfs_bmapi_read(quotip, dqp->q_fileoffset,
439 XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0);
440
441 xfs_iunlock(quotip, lock_mode);
442 if (error)
443 return error;
444
445 ASSERT(nmaps == 1);
446 ASSERT(map.br_blockcount == 1);
447
448 /*
449 * Offset of dquot in the (fixed sized) dquot chunk.
450 */
451 dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) *
452 sizeof(xfs_dqblk_t);
453
454 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
455 if (map.br_startblock == HOLESTARTBLOCK) {
456 /*
457 * We don't allocate unless we're asked to
458 */
459 if (!(flags & XFS_QMOPT_DQALLOC))
460 return -ENOENT;
461
462 ASSERT(tp);
463 error = xfs_qm_dqalloc(tpp, mp, dqp, quotip,
464 dqp->q_fileoffset, &bp);
465 if (error)
466 return error;
467 tp = *tpp;
468 } else {
469 trace_xfs_dqtobp_read(dqp);
470
471 /*
472 * store the blkno etc so that we don't have to do the
473 * mapping all the time
474 */
475 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
476
477 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
478 dqp->q_blkno,
479 mp->m_quotainfo->qi_dqchunklen,
480 0, &bp, &xfs_dquot_buf_ops);
481 if (error) {
482 ASSERT(bp == NULL);
483 return error;
484 }
485 }
486
487 ASSERT(xfs_buf_islocked(bp));
488 *O_bpp = bp;
489 *O_ddpp = bp->b_addr + dqp->q_bufoffset;
490
491 return 0;
492}
493
494
495/*
496 * Read in the ondisk dquot using dqtobp() then copy it to an incore version,
497 * and release the buffer immediately.
498 *
499 * If XFS_QMOPT_DQALLOC is set, allocate a dquot on disk if it needed.
500 */
501int
502xfs_qm_dqread(
503 struct xfs_mount *mp,
504 xfs_dqid_t id,
505 uint type,
506 uint flags,
507 struct xfs_dquot **O_dqpp)
508{
509 struct xfs_dquot *dqp;
510 struct xfs_disk_dquot *ddqp;
511 struct xfs_buf *bp;
512 struct xfs_trans *tp = NULL;
513 int error;
514
515 dqp = kmem_zone_zalloc(xfs_qm_dqzone, KM_SLEEP);
516
517 dqp->dq_flags = type;
518 dqp->q_core.d_id = cpu_to_be32(id);
519 dqp->q_mount = mp;
520 INIT_LIST_HEAD(&dqp->q_lru);
521 mutex_init(&dqp->q_qlock);
522 init_waitqueue_head(&dqp->q_pinwait);
523
524 /*
525 * Because we want to use a counting completion, complete
526 * the flush completion once to allow a single access to
527 * the flush completion without blocking.
528 */
529 init_completion(&dqp->q_flush);
530 complete(&dqp->q_flush);
531
532 /*
533 * Make sure group quotas have a different lock class than user
534 * quotas.
535 */
536 switch (type) {
537 case XFS_DQ_USER:
538 /* uses the default lock class */
539 break;
540 case XFS_DQ_GROUP:
541 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_group_class);
542 break;
543 case XFS_DQ_PROJ:
544 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_project_class);
545 break;
546 default:
547 ASSERT(0);
548 break;
549 }
550
551 XFS_STATS_INC(mp, xs_qm_dquot);
552
553 trace_xfs_dqread(dqp);
554
555 if (flags & XFS_QMOPT_DQALLOC) {
556 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_dqalloc,
557 XFS_QM_DQALLOC_SPACE_RES(mp), 0, 0, &tp);
558 if (error)
559 goto error0;
560 }
561
562 /*
563 * get a pointer to the on-disk dquot and the buffer containing it
564 * dqp already knows its own type (GROUP/USER).
565 */
566 error = xfs_qm_dqtobp(&tp, dqp, &ddqp, &bp, flags);
567 if (error) {
568 /*
569 * This can happen if quotas got turned off (ESRCH),
570 * or if the dquot didn't exist on disk and we ask to
571 * allocate (ENOENT).
572 */
573 trace_xfs_dqread_fail(dqp);
574 goto error1;
575 }
576
577 /* copy everything from disk dquot to the incore dquot */
578 memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t));
579 xfs_qm_dquot_logitem_init(dqp);
580
581 /*
582 * Reservation counters are defined as reservation plus current usage
583 * to avoid having to add every time.
584 */
585 dqp->q_res_bcount = be64_to_cpu(ddqp->d_bcount);
586 dqp->q_res_icount = be64_to_cpu(ddqp->d_icount);
587 dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount);
588
589 /* initialize the dquot speculative prealloc thresholds */
590 xfs_dquot_set_prealloc_limits(dqp);
591
592 /* Mark the buf so that this will stay incore a little longer */
593 xfs_buf_set_ref(bp, XFS_DQUOT_REF);
594
595 /*
596 * We got the buffer with a xfs_trans_read_buf() (in dqtobp())
597 * So we need to release with xfs_trans_brelse().
598 * The strategy here is identical to that of inodes; we lock
599 * the dquot in xfs_qm_dqget() before making it accessible to
600 * others. This is because dquots, like inodes, need a good level of
601 * concurrency, and we don't want to take locks on the entire buffers
602 * for dquot accesses.
603 * Note also that the dquot buffer may even be dirty at this point, if
604 * this particular dquot was repaired. We still aren't afraid to
605 * brelse it because we have the changes incore.
606 */
607 ASSERT(xfs_buf_islocked(bp));
608 xfs_trans_brelse(tp, bp);
609
610 if (tp) {
611 error = xfs_trans_commit(tp);
612 if (error)
613 goto error0;
614 }
615
616 *O_dqpp = dqp;
617 return error;
618
619error1:
620 if (tp)
621 xfs_trans_cancel(tp);
622error0:
623 xfs_qm_dqdestroy(dqp);
624 *O_dqpp = NULL;
625 return error;
626}
627
628/*
629 * Advance to the next id in the current chunk, or if at the
630 * end of the chunk, skip ahead to first id in next allocated chunk
631 * using the SEEK_DATA interface.
632 */
633static int
634xfs_dq_get_next_id(
635 struct xfs_mount *mp,
636 uint type,
637 xfs_dqid_t *id)
638{
639 struct xfs_inode *quotip = xfs_quota_inode(mp, type);
640 xfs_dqid_t next_id = *id + 1; /* simple advance */
641 uint lock_flags;
642 struct xfs_bmbt_irec got;
643 struct xfs_iext_cursor cur;
644 xfs_fsblock_t start;
645 int error = 0;
646
647 /* If we'd wrap past the max ID, stop */
648 if (next_id < *id)
649 return -ENOENT;
650
651 /* If new ID is within the current chunk, advancing it sufficed */
652 if (next_id % mp->m_quotainfo->qi_dqperchunk) {
653 *id = next_id;
654 return 0;
655 }
656
657 /* Nope, next_id is now past the current chunk, so find the next one */
658 start = (xfs_fsblock_t)next_id / mp->m_quotainfo->qi_dqperchunk;
659
660 lock_flags = xfs_ilock_data_map_shared(quotip);
661 if (!(quotip->i_df.if_flags & XFS_IFEXTENTS)) {
662 error = xfs_iread_extents(NULL, quotip, XFS_DATA_FORK);
663 if (error)
664 return error;
665 }
666
667 if (xfs_iext_lookup_extent(quotip, "ip->i_df, start, &cur, &got)) {
668 /* contiguous chunk, bump startoff for the id calculation */
669 if (got.br_startoff < start)
670 got.br_startoff = start;
671 *id = got.br_startoff * mp->m_quotainfo->qi_dqperchunk;
672 } else {
673 error = -ENOENT;
674 }
675
676 xfs_iunlock(quotip, lock_flags);
677
678 return error;
679}
680
681/*
682 * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a
683 * a locked dquot, doing an allocation (if requested) as needed.
684 * When both an inode and an id are given, the inode's id takes precedence.
685 * That is, if the id changes while we don't hold the ilock inside this
686 * function, the new dquot is returned, not necessarily the one requested
687 * in the id argument.
688 */
689int
690xfs_qm_dqget(
691 xfs_mount_t *mp,
692 xfs_inode_t *ip, /* locked inode (optional) */
693 xfs_dqid_t id, /* uid/projid/gid depending on type */
694 uint type, /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */
695 uint flags, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
696 xfs_dquot_t **O_dqpp) /* OUT : locked incore dquot */
697{
698 struct xfs_quotainfo *qi = mp->m_quotainfo;
699 struct radix_tree_root *tree = xfs_dquot_tree(qi, type);
700 struct xfs_dquot *dqp;
701 int error;
702
703 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
704 if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) ||
705 (! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) ||
706 (! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) {
707 return -ESRCH;
708 }
709
710 ASSERT(type == XFS_DQ_USER ||
711 type == XFS_DQ_PROJ ||
712 type == XFS_DQ_GROUP);
713 if (ip) {
714 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
715 ASSERT(xfs_inode_dquot(ip, type) == NULL);
716 }
717
718restart:
719 mutex_lock(&qi->qi_tree_lock);
720 dqp = radix_tree_lookup(tree, id);
721 if (dqp) {
722 xfs_dqlock(dqp);
723 if (dqp->dq_flags & XFS_DQ_FREEING) {
724 xfs_dqunlock(dqp);
725 mutex_unlock(&qi->qi_tree_lock);
726 trace_xfs_dqget_freeing(dqp);
727 delay(1);
728 goto restart;
729 }
730
731 /* uninit / unused quota found in radix tree, keep looking */
732 if (flags & XFS_QMOPT_DQNEXT) {
733 if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
734 xfs_dqunlock(dqp);
735 mutex_unlock(&qi->qi_tree_lock);
736 error = xfs_dq_get_next_id(mp, type, &id);
737 if (error)
738 return error;
739 goto restart;
740 }
741 }
742
743 dqp->q_nrefs++;
744 mutex_unlock(&qi->qi_tree_lock);
745
746 trace_xfs_dqget_hit(dqp);
747 XFS_STATS_INC(mp, xs_qm_dqcachehits);
748 *O_dqpp = dqp;
749 return 0;
750 }
751 mutex_unlock(&qi->qi_tree_lock);
752 XFS_STATS_INC(mp, xs_qm_dqcachemisses);
753
754 /*
755 * Dquot cache miss. We don't want to keep the inode lock across
756 * a (potential) disk read. Also we don't want to deal with the lock
757 * ordering between quotainode and this inode. OTOH, dropping the inode
758 * lock here means dealing with a chown that can happen before
759 * we re-acquire the lock.
760 */
761 if (ip)
762 xfs_iunlock(ip, XFS_ILOCK_EXCL);
763
764 error = xfs_qm_dqread(mp, id, type, flags, &dqp);
765
766 if (ip)
767 xfs_ilock(ip, XFS_ILOCK_EXCL);
768
769 /* If we are asked to find next active id, keep looking */
770 if (error == -ENOENT && (flags & XFS_QMOPT_DQNEXT)) {
771 error = xfs_dq_get_next_id(mp, type, &id);
772 if (!error)
773 goto restart;
774 }
775
776 if (error)
777 return error;
778
779 if (ip) {
780 /*
781 * A dquot could be attached to this inode by now, since
782 * we had dropped the ilock.
783 */
784 if (xfs_this_quota_on(mp, type)) {
785 struct xfs_dquot *dqp1;
786
787 dqp1 = xfs_inode_dquot(ip, type);
788 if (dqp1) {
789 xfs_qm_dqdestroy(dqp);
790 dqp = dqp1;
791 xfs_dqlock(dqp);
792 goto dqret;
793 }
794 } else {
795 /* inode stays locked on return */
796 xfs_qm_dqdestroy(dqp);
797 return -ESRCH;
798 }
799 }
800
801 mutex_lock(&qi->qi_tree_lock);
802 error = radix_tree_insert(tree, id, dqp);
803 if (unlikely(error)) {
804 WARN_ON(error != -EEXIST);
805
806 /*
807 * Duplicate found. Just throw away the new dquot and start
808 * over.
809 */
810 mutex_unlock(&qi->qi_tree_lock);
811 trace_xfs_dqget_dup(dqp);
812 xfs_qm_dqdestroy(dqp);
813 XFS_STATS_INC(mp, xs_qm_dquot_dups);
814 goto restart;
815 }
816
817 /*
818 * We return a locked dquot to the caller, with a reference taken
819 */
820 xfs_dqlock(dqp);
821 dqp->q_nrefs = 1;
822
823 qi->qi_dquots++;
824 mutex_unlock(&qi->qi_tree_lock);
825
826 /* If we are asked to find next active id, keep looking */
827 if (flags & XFS_QMOPT_DQNEXT) {
828 if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
829 xfs_qm_dqput(dqp);
830 error = xfs_dq_get_next_id(mp, type, &id);
831 if (error)
832 return error;
833 goto restart;
834 }
835 }
836
837 dqret:
838 ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL));
839 trace_xfs_dqget_miss(dqp);
840 *O_dqpp = dqp;
841 return 0;
842}
843
844/*
845 * Release a reference to the dquot (decrement ref-count) and unlock it.
846 *
847 * If there is a group quota attached to this dquot, carefully release that
848 * too without tripping over deadlocks'n'stuff.
849 */
850void
851xfs_qm_dqput(
852 struct xfs_dquot *dqp)
853{
854 ASSERT(dqp->q_nrefs > 0);
855 ASSERT(XFS_DQ_IS_LOCKED(dqp));
856
857 trace_xfs_dqput(dqp);
858
859 if (--dqp->q_nrefs == 0) {
860 struct xfs_quotainfo *qi = dqp->q_mount->m_quotainfo;
861 trace_xfs_dqput_free(dqp);
862
863 if (list_lru_add(&qi->qi_lru, &dqp->q_lru))
864 XFS_STATS_INC(dqp->q_mount, xs_qm_dquot_unused);
865 }
866 xfs_dqunlock(dqp);
867}
868
869/*
870 * Release a dquot. Flush it if dirty, then dqput() it.
871 * dquot must not be locked.
872 */
873void
874xfs_qm_dqrele(
875 xfs_dquot_t *dqp)
876{
877 if (!dqp)
878 return;
879
880 trace_xfs_dqrele(dqp);
881
882 xfs_dqlock(dqp);
883 /*
884 * We don't care to flush it if the dquot is dirty here.
885 * That will create stutters that we want to avoid.
886 * Instead we do a delayed write when we try to reclaim
887 * a dirty dquot. Also xfs_sync will take part of the burden...
888 */
889 xfs_qm_dqput(dqp);
890}
891
892/*
893 * This is the dquot flushing I/O completion routine. It is called
894 * from interrupt level when the buffer containing the dquot is
895 * flushed to disk. It is responsible for removing the dquot logitem
896 * from the AIL if it has not been re-logged, and unlocking the dquot's
897 * flush lock. This behavior is very similar to that of inodes..
898 */
899STATIC void
900xfs_qm_dqflush_done(
901 struct xfs_buf *bp,
902 struct xfs_log_item *lip)
903{
904 xfs_dq_logitem_t *qip = (struct xfs_dq_logitem *)lip;
905 xfs_dquot_t *dqp = qip->qli_dquot;
906 struct xfs_ail *ailp = lip->li_ailp;
907
908 /*
909 * We only want to pull the item from the AIL if its
910 * location in the log has not changed since we started the flush.
911 * Thus, we only bother if the dquot's lsn has
912 * not changed. First we check the lsn outside the lock
913 * since it's cheaper, and then we recheck while
914 * holding the lock before removing the dquot from the AIL.
915 */
916 if ((lip->li_flags & XFS_LI_IN_AIL) &&
917 ((lip->li_lsn == qip->qli_flush_lsn) ||
918 (lip->li_flags & XFS_LI_FAILED))) {
919
920 /* xfs_trans_ail_delete() drops the AIL lock. */
921 spin_lock(&ailp->ail_lock);
922 if (lip->li_lsn == qip->qli_flush_lsn) {
923 xfs_trans_ail_delete(ailp, lip, SHUTDOWN_CORRUPT_INCORE);
924 } else {
925 /*
926 * Clear the failed state since we are about to drop the
927 * flush lock
928 */
929 if (lip->li_flags & XFS_LI_FAILED)
930 xfs_clear_li_failed(lip);
931 spin_unlock(&ailp->ail_lock);
932 }
933 }
934
935 /*
936 * Release the dq's flush lock since we're done with it.
937 */
938 xfs_dqfunlock(dqp);
939}
940
941/*
942 * Write a modified dquot to disk.
943 * The dquot must be locked and the flush lock too taken by caller.
944 * The flush lock will not be unlocked until the dquot reaches the disk,
945 * but the dquot is free to be unlocked and modified by the caller
946 * in the interim. Dquot is still locked on return. This behavior is
947 * identical to that of inodes.
948 */
949int
950xfs_qm_dqflush(
951 struct xfs_dquot *dqp,
952 struct xfs_buf **bpp)
953{
954 struct xfs_mount *mp = dqp->q_mount;
955 struct xfs_buf *bp;
956 struct xfs_disk_dquot *ddqp;
957 xfs_failaddr_t fa;
958 int error;
959
960 ASSERT(XFS_DQ_IS_LOCKED(dqp));
961 ASSERT(!completion_done(&dqp->q_flush));
962
963 trace_xfs_dqflush(dqp);
964
965 *bpp = NULL;
966
967 xfs_qm_dqunpin_wait(dqp);
968
969 /*
970 * This may have been unpinned because the filesystem is shutting
971 * down forcibly. If that's the case we must not write this dquot
972 * to disk, because the log record didn't make it to disk.
973 *
974 * We also have to remove the log item from the AIL in this case,
975 * as we wait for an emptry AIL as part of the unmount process.
976 */
977 if (XFS_FORCED_SHUTDOWN(mp)) {
978 struct xfs_log_item *lip = &dqp->q_logitem.qli_item;
979 dqp->dq_flags &= ~XFS_DQ_DIRTY;
980
981 xfs_trans_ail_remove(lip, SHUTDOWN_CORRUPT_INCORE);
982
983 error = -EIO;
984 goto out_unlock;
985 }
986
987 /*
988 * Get the buffer containing the on-disk dquot
989 */
990 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
991 mp->m_quotainfo->qi_dqchunklen, 0, &bp,
992 &xfs_dquot_buf_ops);
993 if (error)
994 goto out_unlock;
995
996 /*
997 * Calculate the location of the dquot inside the buffer.
998 */
999 ddqp = bp->b_addr + dqp->q_bufoffset;
1000
1001 /*
1002 * A simple sanity check in case we got a corrupted dquot..
1003 */
1004 fa = xfs_dquot_verify(mp, &dqp->q_core, be32_to_cpu(ddqp->d_id), 0, 0);
1005 if (fa) {
1006 xfs_alert(mp, "corrupt dquot ID 0x%x in memory at %pS",
1007 be32_to_cpu(ddqp->d_id), fa);
1008 xfs_buf_relse(bp);
1009 xfs_dqfunlock(dqp);
1010 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1011 return -EIO;
1012 }
1013
1014 /* This is the only portion of data that needs to persist */
1015 memcpy(ddqp, &dqp->q_core, sizeof(xfs_disk_dquot_t));
1016
1017 /*
1018 * Clear the dirty field and remember the flush lsn for later use.
1019 */
1020 dqp->dq_flags &= ~XFS_DQ_DIRTY;
1021
1022 xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn,
1023 &dqp->q_logitem.qli_item.li_lsn);
1024
1025 /*
1026 * copy the lsn into the on-disk dquot now while we have the in memory
1027 * dquot here. This can't be done later in the write verifier as we
1028 * can't get access to the log item at that point in time.
1029 *
1030 * We also calculate the CRC here so that the on-disk dquot in the
1031 * buffer always has a valid CRC. This ensures there is no possibility
1032 * of a dquot without an up-to-date CRC getting to disk.
1033 */
1034 if (xfs_sb_version_hascrc(&mp->m_sb)) {
1035 struct xfs_dqblk *dqb = (struct xfs_dqblk *)ddqp;
1036
1037 dqb->dd_lsn = cpu_to_be64(dqp->q_logitem.qli_item.li_lsn);
1038 xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk),
1039 XFS_DQUOT_CRC_OFF);
1040 }
1041
1042 /*
1043 * Attach an iodone routine so that we can remove this dquot from the
1044 * AIL and release the flush lock once the dquot is synced to disk.
1045 */
1046 xfs_buf_attach_iodone(bp, xfs_qm_dqflush_done,
1047 &dqp->q_logitem.qli_item);
1048
1049 /*
1050 * If the buffer is pinned then push on the log so we won't
1051 * get stuck waiting in the write for too long.
1052 */
1053 if (xfs_buf_ispinned(bp)) {
1054 trace_xfs_dqflush_force(dqp);
1055 xfs_log_force(mp, 0);
1056 }
1057
1058 trace_xfs_dqflush_done(dqp);
1059 *bpp = bp;
1060 return 0;
1061
1062out_unlock:
1063 xfs_dqfunlock(dqp);
1064 return -EIO;
1065}
1066
1067/*
1068 * Lock two xfs_dquot structures.
1069 *
1070 * To avoid deadlocks we always lock the quota structure with
1071 * the lowerd id first.
1072 */
1073void
1074xfs_dqlock2(
1075 xfs_dquot_t *d1,
1076 xfs_dquot_t *d2)
1077{
1078 if (d1 && d2) {
1079 ASSERT(d1 != d2);
1080 if (be32_to_cpu(d1->q_core.d_id) >
1081 be32_to_cpu(d2->q_core.d_id)) {
1082 mutex_lock(&d2->q_qlock);
1083 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
1084 } else {
1085 mutex_lock(&d1->q_qlock);
1086 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
1087 }
1088 } else if (d1) {
1089 mutex_lock(&d1->q_qlock);
1090 } else if (d2) {
1091 mutex_lock(&d2->q_qlock);
1092 }
1093}
1094
1095int __init
1096xfs_qm_init(void)
1097{
1098 xfs_qm_dqzone =
1099 kmem_zone_init(sizeof(struct xfs_dquot), "xfs_dquot");
1100 if (!xfs_qm_dqzone)
1101 goto out;
1102
1103 xfs_qm_dqtrxzone =
1104 kmem_zone_init(sizeof(struct xfs_dquot_acct), "xfs_dqtrx");
1105 if (!xfs_qm_dqtrxzone)
1106 goto out_free_dqzone;
1107
1108 return 0;
1109
1110out_free_dqzone:
1111 kmem_zone_destroy(xfs_qm_dqzone);
1112out:
1113 return -ENOMEM;
1114}
1115
1116void
1117xfs_qm_exit(void)
1118{
1119 kmem_zone_destroy(xfs_qm_dqtrxzone);
1120 kmem_zone_destroy(xfs_qm_dqzone);
1121}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2003 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_format.h"
9#include "xfs_log_format.h"
10#include "xfs_shared.h"
11#include "xfs_trans_resv.h"
12#include "xfs_bit.h"
13#include "xfs_mount.h"
14#include "xfs_defer.h"
15#include "xfs_inode.h"
16#include "xfs_bmap.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"
22#include "xfs_qm.h"
23#include "xfs_trace.h"
24#include "xfs_log.h"
25#include "xfs_bmap_btree.h"
26#include "xfs_error.h"
27#include "xfs_health.h"
28
29/*
30 * Lock order:
31 *
32 * ip->i_lock
33 * qi->qi_tree_lock
34 * dquot->q_qlock (xfs_dqlock() and friends)
35 * dquot->q_flush (xfs_dqflock() and friends)
36 * qi->qi_lru_lock
37 *
38 * If two dquots need to be locked the order is user before group/project,
39 * otherwise by the lowest id first, see xfs_dqlock2.
40 */
41
42struct kmem_cache *xfs_dqtrx_cache;
43static struct kmem_cache *xfs_dquot_cache;
44
45static struct lock_class_key xfs_dquot_group_class;
46static struct lock_class_key xfs_dquot_project_class;
47
48/* Record observations of quota corruption with the health tracking system. */
49static void
50xfs_dquot_mark_sick(
51 struct xfs_dquot *dqp)
52{
53 struct xfs_mount *mp = dqp->q_mount;
54
55 switch (dqp->q_type) {
56 case XFS_DQTYPE_USER:
57 xfs_fs_mark_sick(mp, XFS_SICK_FS_UQUOTA);
58 break;
59 case XFS_DQTYPE_GROUP:
60 xfs_fs_mark_sick(mp, XFS_SICK_FS_GQUOTA);
61 break;
62 case XFS_DQTYPE_PROJ:
63 xfs_fs_mark_sick(mp, XFS_SICK_FS_PQUOTA);
64 break;
65 default:
66 ASSERT(0);
67 break;
68 }
69}
70
71/*
72 * Detach the dquot buffer if it's still attached, because we can get called
73 * through dqpurge after a log shutdown. Caller must hold the dqflock or have
74 * otherwise isolated the dquot.
75 */
76void
77xfs_dquot_detach_buf(
78 struct xfs_dquot *dqp)
79{
80 struct xfs_dq_logitem *qlip = &dqp->q_logitem;
81 struct xfs_buf *bp = NULL;
82
83 spin_lock(&qlip->qli_lock);
84 if (qlip->qli_item.li_buf) {
85 bp = qlip->qli_item.li_buf;
86 qlip->qli_item.li_buf = NULL;
87 }
88 spin_unlock(&qlip->qli_lock);
89 if (bp) {
90 xfs_buf_lock(bp);
91 list_del_init(&qlip->qli_item.li_bio_list);
92 xfs_buf_relse(bp);
93 }
94}
95
96/*
97 * This is called to free all the memory associated with a dquot
98 */
99void
100xfs_qm_dqdestroy(
101 struct xfs_dquot *dqp)
102{
103 ASSERT(list_empty(&dqp->q_lru));
104 ASSERT(dqp->q_logitem.qli_item.li_buf == NULL);
105
106 kvfree(dqp->q_logitem.qli_item.li_lv_shadow);
107 mutex_destroy(&dqp->q_qlock);
108
109 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot);
110 kmem_cache_free(xfs_dquot_cache, dqp);
111}
112
113/*
114 * If default limits are in force, push them into the dquot now.
115 * We overwrite the dquot limits only if they are zero and this
116 * is not the root dquot.
117 */
118void
119xfs_qm_adjust_dqlimits(
120 struct xfs_dquot *dq)
121{
122 struct xfs_mount *mp = dq->q_mount;
123 struct xfs_quotainfo *q = mp->m_quotainfo;
124 struct xfs_def_quota *defq;
125 int prealloc = 0;
126
127 ASSERT(dq->q_id);
128 defq = xfs_get_defquota(q, xfs_dquot_type(dq));
129
130 if (!dq->q_blk.softlimit) {
131 dq->q_blk.softlimit = defq->blk.soft;
132 prealloc = 1;
133 }
134 if (!dq->q_blk.hardlimit) {
135 dq->q_blk.hardlimit = defq->blk.hard;
136 prealloc = 1;
137 }
138 if (!dq->q_ino.softlimit)
139 dq->q_ino.softlimit = defq->ino.soft;
140 if (!dq->q_ino.hardlimit)
141 dq->q_ino.hardlimit = defq->ino.hard;
142 if (!dq->q_rtb.softlimit)
143 dq->q_rtb.softlimit = defq->rtb.soft;
144 if (!dq->q_rtb.hardlimit)
145 dq->q_rtb.hardlimit = defq->rtb.hard;
146
147 if (prealloc)
148 xfs_dquot_set_prealloc_limits(dq);
149}
150
151/* Set the expiration time of a quota's grace period. */
152time64_t
153xfs_dquot_set_timeout(
154 struct xfs_mount *mp,
155 time64_t timeout)
156{
157 struct xfs_quotainfo *qi = mp->m_quotainfo;
158
159 return clamp_t(time64_t, timeout, qi->qi_expiry_min,
160 qi->qi_expiry_max);
161}
162
163/* Set the length of the default grace period. */
164time64_t
165xfs_dquot_set_grace_period(
166 time64_t grace)
167{
168 return clamp_t(time64_t, grace, XFS_DQ_GRACE_MIN, XFS_DQ_GRACE_MAX);
169}
170
171/*
172 * Determine if this quota counter is over either limit and set the quota
173 * timers as appropriate.
174 */
175static inline void
176xfs_qm_adjust_res_timer(
177 struct xfs_mount *mp,
178 struct xfs_dquot_res *res,
179 struct xfs_quota_limits *qlim)
180{
181 ASSERT(res->hardlimit == 0 || res->softlimit <= res->hardlimit);
182
183 if ((res->softlimit && res->count > res->softlimit) ||
184 (res->hardlimit && res->count > res->hardlimit)) {
185 if (res->timer == 0)
186 res->timer = xfs_dquot_set_timeout(mp,
187 ktime_get_real_seconds() + qlim->time);
188 } else {
189 res->timer = 0;
190 }
191}
192
193/*
194 * Check the limits and timers of a dquot and start or reset timers
195 * if necessary.
196 * This gets called even when quota enforcement is OFF, which makes our
197 * life a little less complicated. (We just don't reject any quota
198 * reservations in that case, when enforcement is off).
199 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when
200 * enforcement's off.
201 * In contrast, warnings are a little different in that they don't
202 * 'automatically' get started when limits get exceeded. They do
203 * get reset to zero, however, when we find the count to be under
204 * the soft limit (they are only ever set non-zero via userspace).
205 */
206void
207xfs_qm_adjust_dqtimers(
208 struct xfs_dquot *dq)
209{
210 struct xfs_mount *mp = dq->q_mount;
211 struct xfs_quotainfo *qi = mp->m_quotainfo;
212 struct xfs_def_quota *defq;
213
214 ASSERT(dq->q_id);
215 defq = xfs_get_defquota(qi, xfs_dquot_type(dq));
216
217 xfs_qm_adjust_res_timer(dq->q_mount, &dq->q_blk, &defq->blk);
218 xfs_qm_adjust_res_timer(dq->q_mount, &dq->q_ino, &defq->ino);
219 xfs_qm_adjust_res_timer(dq->q_mount, &dq->q_rtb, &defq->rtb);
220}
221
222/*
223 * initialize a buffer full of dquots and log the whole thing
224 */
225void
226xfs_qm_init_dquot_blk(
227 struct xfs_trans *tp,
228 xfs_dqid_t id,
229 xfs_dqtype_t type,
230 struct xfs_buf *bp)
231{
232 struct xfs_mount *mp = tp->t_mountp;
233 struct xfs_quotainfo *q = mp->m_quotainfo;
234 struct xfs_dqblk *d;
235 xfs_dqid_t curid;
236 unsigned int qflag;
237 unsigned int blftype;
238 int i;
239
240 ASSERT(tp);
241 ASSERT(xfs_buf_islocked(bp));
242
243 switch (type) {
244 case XFS_DQTYPE_USER:
245 qflag = XFS_UQUOTA_CHKD;
246 blftype = XFS_BLF_UDQUOT_BUF;
247 break;
248 case XFS_DQTYPE_PROJ:
249 qflag = XFS_PQUOTA_CHKD;
250 blftype = XFS_BLF_PDQUOT_BUF;
251 break;
252 case XFS_DQTYPE_GROUP:
253 qflag = XFS_GQUOTA_CHKD;
254 blftype = XFS_BLF_GDQUOT_BUF;
255 break;
256 default:
257 ASSERT(0);
258 return;
259 }
260
261 d = bp->b_addr;
262
263 /*
264 * ID of the first dquot in the block - id's are zero based.
265 */
266 curid = id - (id % q->qi_dqperchunk);
267 memset(d, 0, BBTOB(q->qi_dqchunklen));
268 for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++) {
269 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
270 d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
271 d->dd_diskdq.d_id = cpu_to_be32(curid);
272 d->dd_diskdq.d_type = type;
273 if (curid > 0 && xfs_has_bigtime(mp))
274 d->dd_diskdq.d_type |= XFS_DQTYPE_BIGTIME;
275 if (xfs_has_crc(mp)) {
276 uuid_copy(&d->dd_uuid, &mp->m_sb.sb_meta_uuid);
277 xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk),
278 XFS_DQUOT_CRC_OFF);
279 }
280 }
281
282 xfs_trans_dquot_buf(tp, bp, blftype);
283
284 /*
285 * quotacheck uses delayed writes to update all the dquots on disk in an
286 * efficient manner instead of logging the individual dquot changes as
287 * they are made. However if we log the buffer allocated here and crash
288 * after quotacheck while the logged initialisation is still in the
289 * active region of the log, log recovery can replay the dquot buffer
290 * initialisation over the top of the checked dquots and corrupt quota
291 * accounting.
292 *
293 * To avoid this problem, quotacheck cannot log the initialised buffer.
294 * We must still dirty the buffer and write it back before the
295 * allocation transaction clears the log. Therefore, mark the buffer as
296 * ordered instead of logging it directly. This is safe for quotacheck
297 * because it detects and repairs allocated but initialized dquot blocks
298 * in the quota inodes.
299 */
300 if (!(mp->m_qflags & qflag))
301 xfs_trans_ordered_buf(tp, bp);
302 else
303 xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1);
304}
305
306static void
307xfs_dquot_set_prealloc(
308 struct xfs_dquot_pre *pre,
309 const struct xfs_dquot_res *res)
310{
311 xfs_qcnt_t space;
312
313 pre->q_prealloc_hi_wmark = res->hardlimit;
314 pre->q_prealloc_lo_wmark = res->softlimit;
315
316 space = div_u64(pre->q_prealloc_hi_wmark, 100);
317 if (!pre->q_prealloc_lo_wmark)
318 pre->q_prealloc_lo_wmark = space * 95;
319
320 pre->q_low_space[XFS_QLOWSP_1_PCNT] = space;
321 pre->q_low_space[XFS_QLOWSP_3_PCNT] = space * 3;
322 pre->q_low_space[XFS_QLOWSP_5_PCNT] = space * 5;
323}
324
325/*
326 * Initialize the dynamic speculative preallocation thresholds. The lo/hi
327 * watermarks correspond to the soft and hard limits by default. If a soft limit
328 * is not specified, we use 95% of the hard limit.
329 */
330void
331xfs_dquot_set_prealloc_limits(struct xfs_dquot *dqp)
332{
333 xfs_dquot_set_prealloc(&dqp->q_blk_prealloc, &dqp->q_blk);
334 xfs_dquot_set_prealloc(&dqp->q_rtb_prealloc, &dqp->q_rtb);
335}
336
337/*
338 * Ensure that the given in-core dquot has a buffer on disk backing it, and
339 * return the buffer locked and held. This is called when the bmapi finds a
340 * hole.
341 */
342STATIC int
343xfs_dquot_disk_alloc(
344 struct xfs_dquot *dqp,
345 struct xfs_buf **bpp)
346{
347 struct xfs_bmbt_irec map;
348 struct xfs_trans *tp;
349 struct xfs_mount *mp = dqp->q_mount;
350 struct xfs_buf *bp;
351 xfs_dqtype_t qtype = xfs_dquot_type(dqp);
352 struct xfs_inode *quotip = xfs_quota_inode(mp, qtype);
353 int nmaps = 1;
354 int error;
355
356 trace_xfs_dqalloc(dqp);
357
358 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_dqalloc,
359 XFS_QM_DQALLOC_SPACE_RES(mp), 0, 0, &tp);
360 if (error)
361 return error;
362
363 xfs_ilock(quotip, XFS_ILOCK_EXCL);
364 xfs_trans_ijoin(tp, quotip, 0);
365
366 if (!xfs_this_quota_on(dqp->q_mount, qtype)) {
367 /*
368 * Return if this type of quotas is turned off while we didn't
369 * have an inode lock
370 */
371 error = -ESRCH;
372 goto err_cancel;
373 }
374
375 error = xfs_iext_count_extend(tp, quotip, XFS_DATA_FORK,
376 XFS_IEXT_ADD_NOSPLIT_CNT);
377 if (error)
378 goto err_cancel;
379
380 /* Create the block mapping. */
381 error = xfs_bmapi_write(tp, quotip, dqp->q_fileoffset,
382 XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA, 0, &map,
383 &nmaps);
384 if (error)
385 goto err_cancel;
386
387 ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
388 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
389 (map.br_startblock != HOLESTARTBLOCK));
390
391 /*
392 * Keep track of the blkno to save a lookup later
393 */
394 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
395
396 /* now we can just get the buffer (there's nothing to read yet) */
397 error = xfs_trans_get_buf(tp, mp->m_ddev_targp, dqp->q_blkno,
398 mp->m_quotainfo->qi_dqchunklen, 0, &bp);
399 if (error)
400 goto err_cancel;
401 bp->b_ops = &xfs_dquot_buf_ops;
402
403 /*
404 * Make a chunk of dquots out of this buffer and log
405 * the entire thing.
406 */
407 xfs_qm_init_dquot_blk(tp, dqp->q_id, qtype, bp);
408 xfs_buf_set_ref(bp, XFS_DQUOT_REF);
409
410 /*
411 * Hold the buffer and join it to the dfops so that we'll still own
412 * the buffer when we return to the caller. The buffer disposal on
413 * error must be paid attention to very carefully, as it has been
414 * broken since commit efa092f3d4c6 "[XFS] Fixes a bug in the quota
415 * code when allocating a new dquot record" in 2005, and the later
416 * conversion to xfs_defer_ops in commit 310a75a3c6c747 failed to keep
417 * the buffer locked across the _defer_finish call. We can now do
418 * this correctly with xfs_defer_bjoin.
419 *
420 * Above, we allocated a disk block for the dquot information and used
421 * get_buf to initialize the dquot. If the _defer_finish fails, the old
422 * transaction is gone but the new buffer is not joined or held to any
423 * transaction, so we must _buf_relse it.
424 *
425 * If everything succeeds, the caller of this function is returned a
426 * buffer that is locked and held to the transaction. The caller
427 * is responsible for unlocking any buffer passed back, either
428 * manually or by committing the transaction. On error, the buffer is
429 * released and not passed back.
430 *
431 * Keep the quota inode ILOCKed until after the transaction commit to
432 * maintain the atomicity of bmap/rmap updates.
433 */
434 xfs_trans_bhold(tp, bp);
435 error = xfs_trans_commit(tp);
436 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
437 if (error) {
438 xfs_buf_relse(bp);
439 return error;
440 }
441
442 *bpp = bp;
443 return 0;
444
445err_cancel:
446 xfs_trans_cancel(tp);
447 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
448 return error;
449}
450
451/*
452 * Read in the in-core dquot's on-disk metadata and return the buffer.
453 * Returns ENOENT to signal a hole.
454 */
455STATIC int
456xfs_dquot_disk_read(
457 struct xfs_mount *mp,
458 struct xfs_dquot *dqp,
459 struct xfs_buf **bpp)
460{
461 struct xfs_bmbt_irec map;
462 struct xfs_buf *bp;
463 xfs_dqtype_t qtype = xfs_dquot_type(dqp);
464 struct xfs_inode *quotip = xfs_quota_inode(mp, qtype);
465 uint lock_mode;
466 int nmaps = 1;
467 int error;
468
469 lock_mode = xfs_ilock_data_map_shared(quotip);
470 if (!xfs_this_quota_on(mp, qtype)) {
471 /*
472 * Return if this type of quotas is turned off while we
473 * didn't have the quota inode lock.
474 */
475 xfs_iunlock(quotip, lock_mode);
476 return -ESRCH;
477 }
478
479 /*
480 * Find the block map; no allocations yet
481 */
482 error = xfs_bmapi_read(quotip, dqp->q_fileoffset,
483 XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0);
484 xfs_iunlock(quotip, lock_mode);
485 if (error)
486 return error;
487
488 ASSERT(nmaps == 1);
489 ASSERT(map.br_blockcount >= 1);
490 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
491 if (map.br_startblock == HOLESTARTBLOCK)
492 return -ENOENT;
493
494 trace_xfs_dqtobp_read(dqp);
495
496 /*
497 * store the blkno etc so that we don't have to do the
498 * mapping all the time
499 */
500 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
501
502 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
503 mp->m_quotainfo->qi_dqchunklen, 0, &bp,
504 &xfs_dquot_buf_ops);
505 if (xfs_metadata_is_sick(error))
506 xfs_dquot_mark_sick(dqp);
507 if (error) {
508 ASSERT(bp == NULL);
509 return error;
510 }
511
512 ASSERT(xfs_buf_islocked(bp));
513 xfs_buf_set_ref(bp, XFS_DQUOT_REF);
514 *bpp = bp;
515
516 return 0;
517}
518
519/* Allocate and initialize everything we need for an incore dquot. */
520STATIC struct xfs_dquot *
521xfs_dquot_alloc(
522 struct xfs_mount *mp,
523 xfs_dqid_t id,
524 xfs_dqtype_t type)
525{
526 struct xfs_dquot *dqp;
527
528 dqp = kmem_cache_zalloc(xfs_dquot_cache, GFP_KERNEL | __GFP_NOFAIL);
529
530 dqp->q_type = type;
531 dqp->q_id = id;
532 dqp->q_mount = mp;
533 INIT_LIST_HEAD(&dqp->q_lru);
534 mutex_init(&dqp->q_qlock);
535 init_waitqueue_head(&dqp->q_pinwait);
536 dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;
537 /*
538 * Offset of dquot in the (fixed sized) dquot chunk.
539 */
540 dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) *
541 sizeof(struct xfs_dqblk);
542
543 /*
544 * Because we want to use a counting completion, complete
545 * the flush completion once to allow a single access to
546 * the flush completion without blocking.
547 */
548 init_completion(&dqp->q_flush);
549 complete(&dqp->q_flush);
550
551 /*
552 * Make sure group quotas have a different lock class than user
553 * quotas.
554 */
555 switch (type) {
556 case XFS_DQTYPE_USER:
557 /* uses the default lock class */
558 break;
559 case XFS_DQTYPE_GROUP:
560 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_group_class);
561 break;
562 case XFS_DQTYPE_PROJ:
563 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_project_class);
564 break;
565 default:
566 ASSERT(0);
567 break;
568 }
569
570 xfs_qm_dquot_logitem_init(dqp);
571
572 XFS_STATS_INC(mp, xs_qm_dquot);
573 return dqp;
574}
575
576/* Check the ondisk dquot's id and type match what the incore dquot expects. */
577static bool
578xfs_dquot_check_type(
579 struct xfs_dquot *dqp,
580 struct xfs_disk_dquot *ddqp)
581{
582 uint8_t ddqp_type;
583 uint8_t dqp_type;
584
585 ddqp_type = ddqp->d_type & XFS_DQTYPE_REC_MASK;
586 dqp_type = xfs_dquot_type(dqp);
587
588 if (be32_to_cpu(ddqp->d_id) != dqp->q_id)
589 return false;
590
591 /*
592 * V5 filesystems always expect an exact type match. V4 filesystems
593 * expect an exact match for user dquots and for non-root group and
594 * project dquots.
595 */
596 if (xfs_has_crc(dqp->q_mount) ||
597 dqp_type == XFS_DQTYPE_USER || dqp->q_id != 0)
598 return ddqp_type == dqp_type;
599
600 /*
601 * V4 filesystems support either group or project quotas, but not both
602 * at the same time. The non-user quota file can be switched between
603 * group and project quota uses depending on the mount options, which
604 * means that we can encounter the other type when we try to load quota
605 * defaults. Quotacheck will soon reset the entire quota file
606 * (including the root dquot) anyway, but don't log scary corruption
607 * reports to dmesg.
608 */
609 return ddqp_type == XFS_DQTYPE_GROUP || ddqp_type == XFS_DQTYPE_PROJ;
610}
611
612/* Copy the in-core quota fields in from the on-disk buffer. */
613STATIC int
614xfs_dquot_from_disk(
615 struct xfs_dquot *dqp,
616 struct xfs_buf *bp)
617{
618 struct xfs_dqblk *dqb = xfs_buf_offset(bp, dqp->q_bufoffset);
619 struct xfs_disk_dquot *ddqp = &dqb->dd_diskdq;
620
621 /*
622 * Ensure that we got the type and ID we were looking for.
623 * Everything else was checked by the dquot buffer verifier.
624 */
625 if (!xfs_dquot_check_type(dqp, ddqp)) {
626 xfs_alert_tag(bp->b_mount, XFS_PTAG_VERIFIER_ERROR,
627 "Metadata corruption detected at %pS, quota %u",
628 __this_address, dqp->q_id);
629 xfs_alert(bp->b_mount, "Unmount and run xfs_repair");
630 xfs_dquot_mark_sick(dqp);
631 return -EFSCORRUPTED;
632 }
633
634 /* copy everything from disk dquot to the incore dquot */
635 dqp->q_type = ddqp->d_type;
636 dqp->q_blk.hardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
637 dqp->q_blk.softlimit = be64_to_cpu(ddqp->d_blk_softlimit);
638 dqp->q_ino.hardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
639 dqp->q_ino.softlimit = be64_to_cpu(ddqp->d_ino_softlimit);
640 dqp->q_rtb.hardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
641 dqp->q_rtb.softlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
642
643 dqp->q_blk.count = be64_to_cpu(ddqp->d_bcount);
644 dqp->q_ino.count = be64_to_cpu(ddqp->d_icount);
645 dqp->q_rtb.count = be64_to_cpu(ddqp->d_rtbcount);
646
647 dqp->q_blk.timer = xfs_dquot_from_disk_ts(ddqp, ddqp->d_btimer);
648 dqp->q_ino.timer = xfs_dquot_from_disk_ts(ddqp, ddqp->d_itimer);
649 dqp->q_rtb.timer = xfs_dquot_from_disk_ts(ddqp, ddqp->d_rtbtimer);
650
651 /*
652 * Reservation counters are defined as reservation plus current usage
653 * to avoid having to add every time.
654 */
655 dqp->q_blk.reserved = dqp->q_blk.count;
656 dqp->q_ino.reserved = dqp->q_ino.count;
657 dqp->q_rtb.reserved = dqp->q_rtb.count;
658
659 /* initialize the dquot speculative prealloc thresholds */
660 xfs_dquot_set_prealloc_limits(dqp);
661 return 0;
662}
663
664/* Copy the in-core quota fields into the on-disk buffer. */
665void
666xfs_dquot_to_disk(
667 struct xfs_disk_dquot *ddqp,
668 struct xfs_dquot *dqp)
669{
670 ddqp->d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
671 ddqp->d_version = XFS_DQUOT_VERSION;
672 ddqp->d_type = dqp->q_type;
673 ddqp->d_id = cpu_to_be32(dqp->q_id);
674 ddqp->d_pad0 = 0;
675 ddqp->d_pad = 0;
676
677 ddqp->d_blk_hardlimit = cpu_to_be64(dqp->q_blk.hardlimit);
678 ddqp->d_blk_softlimit = cpu_to_be64(dqp->q_blk.softlimit);
679 ddqp->d_ino_hardlimit = cpu_to_be64(dqp->q_ino.hardlimit);
680 ddqp->d_ino_softlimit = cpu_to_be64(dqp->q_ino.softlimit);
681 ddqp->d_rtb_hardlimit = cpu_to_be64(dqp->q_rtb.hardlimit);
682 ddqp->d_rtb_softlimit = cpu_to_be64(dqp->q_rtb.softlimit);
683
684 ddqp->d_bcount = cpu_to_be64(dqp->q_blk.count);
685 ddqp->d_icount = cpu_to_be64(dqp->q_ino.count);
686 ddqp->d_rtbcount = cpu_to_be64(dqp->q_rtb.count);
687
688 ddqp->d_bwarns = 0;
689 ddqp->d_iwarns = 0;
690 ddqp->d_rtbwarns = 0;
691
692 ddqp->d_btimer = xfs_dquot_to_disk_ts(dqp, dqp->q_blk.timer);
693 ddqp->d_itimer = xfs_dquot_to_disk_ts(dqp, dqp->q_ino.timer);
694 ddqp->d_rtbtimer = xfs_dquot_to_disk_ts(dqp, dqp->q_rtb.timer);
695}
696
697/*
698 * Read in the ondisk dquot using dqtobp() then copy it to an incore version,
699 * and release the buffer immediately. If @can_alloc is true, fill any
700 * holes in the on-disk metadata.
701 */
702static int
703xfs_qm_dqread(
704 struct xfs_mount *mp,
705 xfs_dqid_t id,
706 xfs_dqtype_t type,
707 bool can_alloc,
708 struct xfs_dquot **dqpp)
709{
710 struct xfs_dquot *dqp;
711 struct xfs_buf *bp;
712 int error;
713
714 dqp = xfs_dquot_alloc(mp, id, type);
715 trace_xfs_dqread(dqp);
716
717 /* Try to read the buffer, allocating if necessary. */
718 error = xfs_dquot_disk_read(mp, dqp, &bp);
719 if (error == -ENOENT && can_alloc)
720 error = xfs_dquot_disk_alloc(dqp, &bp);
721 if (error)
722 goto err;
723
724 /*
725 * At this point we should have a clean locked buffer. Copy the data
726 * to the incore dquot and release the buffer since the incore dquot
727 * has its own locking protocol so we needn't tie up the buffer any
728 * further.
729 */
730 ASSERT(xfs_buf_islocked(bp));
731 error = xfs_dquot_from_disk(dqp, bp);
732 xfs_buf_relse(bp);
733 if (error)
734 goto err;
735
736 *dqpp = dqp;
737 return error;
738
739err:
740 trace_xfs_dqread_fail(dqp);
741 xfs_qm_dqdestroy(dqp);
742 *dqpp = NULL;
743 return error;
744}
745
746/*
747 * Advance to the next id in the current chunk, or if at the
748 * end of the chunk, skip ahead to first id in next allocated chunk
749 * using the SEEK_DATA interface.
750 */
751static int
752xfs_dq_get_next_id(
753 struct xfs_mount *mp,
754 xfs_dqtype_t type,
755 xfs_dqid_t *id)
756{
757 struct xfs_inode *quotip = xfs_quota_inode(mp, type);
758 xfs_dqid_t next_id = *id + 1; /* simple advance */
759 uint lock_flags;
760 struct xfs_bmbt_irec got;
761 struct xfs_iext_cursor cur;
762 xfs_fsblock_t start;
763 int error = 0;
764
765 /* If we'd wrap past the max ID, stop */
766 if (next_id < *id)
767 return -ENOENT;
768
769 /* If new ID is within the current chunk, advancing it sufficed */
770 if (next_id % mp->m_quotainfo->qi_dqperchunk) {
771 *id = next_id;
772 return 0;
773 }
774
775 /* Nope, next_id is now past the current chunk, so find the next one */
776 start = (xfs_fsblock_t)next_id / mp->m_quotainfo->qi_dqperchunk;
777
778 lock_flags = xfs_ilock_data_map_shared(quotip);
779 error = xfs_iread_extents(NULL, quotip, XFS_DATA_FORK);
780 if (error)
781 return error;
782
783 if (xfs_iext_lookup_extent(quotip, "ip->i_df, start, &cur, &got)) {
784 /* contiguous chunk, bump startoff for the id calculation */
785 if (got.br_startoff < start)
786 got.br_startoff = start;
787 *id = got.br_startoff * mp->m_quotainfo->qi_dqperchunk;
788 } else {
789 error = -ENOENT;
790 }
791
792 xfs_iunlock(quotip, lock_flags);
793
794 return error;
795}
796
797/*
798 * Look up the dquot in the in-core cache. If found, the dquot is returned
799 * locked and ready to go.
800 */
801static struct xfs_dquot *
802xfs_qm_dqget_cache_lookup(
803 struct xfs_mount *mp,
804 struct xfs_quotainfo *qi,
805 struct radix_tree_root *tree,
806 xfs_dqid_t id)
807{
808 struct xfs_dquot *dqp;
809
810restart:
811 mutex_lock(&qi->qi_tree_lock);
812 dqp = radix_tree_lookup(tree, id);
813 if (!dqp) {
814 mutex_unlock(&qi->qi_tree_lock);
815 XFS_STATS_INC(mp, xs_qm_dqcachemisses);
816 return NULL;
817 }
818
819 xfs_dqlock(dqp);
820 if (dqp->q_flags & XFS_DQFLAG_FREEING) {
821 xfs_dqunlock(dqp);
822 mutex_unlock(&qi->qi_tree_lock);
823 trace_xfs_dqget_freeing(dqp);
824 delay(1);
825 goto restart;
826 }
827
828 dqp->q_nrefs++;
829 mutex_unlock(&qi->qi_tree_lock);
830
831 trace_xfs_dqget_hit(dqp);
832 XFS_STATS_INC(mp, xs_qm_dqcachehits);
833 return dqp;
834}
835
836/*
837 * Try to insert a new dquot into the in-core cache. If an error occurs the
838 * caller should throw away the dquot and start over. Otherwise, the dquot
839 * is returned locked (and held by the cache) as if there had been a cache
840 * hit.
841 *
842 * The insert needs to be done under memalloc_nofs context because the radix
843 * tree can do memory allocation during insert. The qi->qi_tree_lock is taken in
844 * memory reclaim when freeing unused dquots, so we cannot have the radix tree
845 * node allocation recursing into filesystem reclaim whilst we hold the
846 * qi_tree_lock.
847 */
848static int
849xfs_qm_dqget_cache_insert(
850 struct xfs_mount *mp,
851 struct xfs_quotainfo *qi,
852 struct radix_tree_root *tree,
853 xfs_dqid_t id,
854 struct xfs_dquot *dqp)
855{
856 unsigned int nofs_flags;
857 int error;
858
859 nofs_flags = memalloc_nofs_save();
860 mutex_lock(&qi->qi_tree_lock);
861 error = radix_tree_insert(tree, id, dqp);
862 if (unlikely(error)) {
863 /* Duplicate found! Caller must try again. */
864 trace_xfs_dqget_dup(dqp);
865 goto out_unlock;
866 }
867
868 /* Return a locked dquot to the caller, with a reference taken. */
869 xfs_dqlock(dqp);
870 dqp->q_nrefs = 1;
871 qi->qi_dquots++;
872
873out_unlock:
874 mutex_unlock(&qi->qi_tree_lock);
875 memalloc_nofs_restore(nofs_flags);
876 return error;
877}
878
879/* Check our input parameters. */
880static int
881xfs_qm_dqget_checks(
882 struct xfs_mount *mp,
883 xfs_dqtype_t type)
884{
885 switch (type) {
886 case XFS_DQTYPE_USER:
887 if (!XFS_IS_UQUOTA_ON(mp))
888 return -ESRCH;
889 return 0;
890 case XFS_DQTYPE_GROUP:
891 if (!XFS_IS_GQUOTA_ON(mp))
892 return -ESRCH;
893 return 0;
894 case XFS_DQTYPE_PROJ:
895 if (!XFS_IS_PQUOTA_ON(mp))
896 return -ESRCH;
897 return 0;
898 default:
899 WARN_ON_ONCE(0);
900 return -EINVAL;
901 }
902}
903
904/*
905 * Given the file system, id, and type (UDQUOT/GDQUOT/PDQUOT), return a
906 * locked dquot, doing an allocation (if requested) as needed.
907 */
908int
909xfs_qm_dqget(
910 struct xfs_mount *mp,
911 xfs_dqid_t id,
912 xfs_dqtype_t type,
913 bool can_alloc,
914 struct xfs_dquot **O_dqpp)
915{
916 struct xfs_quotainfo *qi = mp->m_quotainfo;
917 struct radix_tree_root *tree = xfs_dquot_tree(qi, type);
918 struct xfs_dquot *dqp;
919 int error;
920
921 error = xfs_qm_dqget_checks(mp, type);
922 if (error)
923 return error;
924
925restart:
926 dqp = xfs_qm_dqget_cache_lookup(mp, qi, tree, id);
927 if (dqp) {
928 *O_dqpp = dqp;
929 return 0;
930 }
931
932 error = xfs_qm_dqread(mp, id, type, can_alloc, &dqp);
933 if (error)
934 return error;
935
936 error = xfs_qm_dqget_cache_insert(mp, qi, tree, id, dqp);
937 if (error) {
938 /*
939 * Duplicate found. Just throw away the new dquot and start
940 * over.
941 */
942 xfs_qm_dqdestroy(dqp);
943 XFS_STATS_INC(mp, xs_qm_dquot_dups);
944 goto restart;
945 }
946
947 trace_xfs_dqget_miss(dqp);
948 *O_dqpp = dqp;
949 return 0;
950}
951
952/*
953 * Given a dquot id and type, read and initialize a dquot from the on-disk
954 * metadata. This function is only for use during quota initialization so
955 * it ignores the dquot cache assuming that the dquot shrinker isn't set up.
956 * The caller is responsible for _qm_dqdestroy'ing the returned dquot.
957 */
958int
959xfs_qm_dqget_uncached(
960 struct xfs_mount *mp,
961 xfs_dqid_t id,
962 xfs_dqtype_t type,
963 struct xfs_dquot **dqpp)
964{
965 int error;
966
967 error = xfs_qm_dqget_checks(mp, type);
968 if (error)
969 return error;
970
971 return xfs_qm_dqread(mp, id, type, 0, dqpp);
972}
973
974/* Return the quota id for a given inode and type. */
975xfs_dqid_t
976xfs_qm_id_for_quotatype(
977 struct xfs_inode *ip,
978 xfs_dqtype_t type)
979{
980 switch (type) {
981 case XFS_DQTYPE_USER:
982 return i_uid_read(VFS_I(ip));
983 case XFS_DQTYPE_GROUP:
984 return i_gid_read(VFS_I(ip));
985 case XFS_DQTYPE_PROJ:
986 return ip->i_projid;
987 }
988 ASSERT(0);
989 return 0;
990}
991
992/*
993 * Return the dquot for a given inode and type. If @can_alloc is true, then
994 * allocate blocks if needed. The inode's ILOCK must be held and it must not
995 * have already had an inode attached.
996 */
997int
998xfs_qm_dqget_inode(
999 struct xfs_inode *ip,
1000 xfs_dqtype_t type,
1001 bool can_alloc,
1002 struct xfs_dquot **O_dqpp)
1003{
1004 struct xfs_mount *mp = ip->i_mount;
1005 struct xfs_quotainfo *qi = mp->m_quotainfo;
1006 struct radix_tree_root *tree = xfs_dquot_tree(qi, type);
1007 struct xfs_dquot *dqp;
1008 xfs_dqid_t id;
1009 int error;
1010
1011 error = xfs_qm_dqget_checks(mp, type);
1012 if (error)
1013 return error;
1014
1015 xfs_assert_ilocked(ip, XFS_ILOCK_EXCL);
1016 ASSERT(xfs_inode_dquot(ip, type) == NULL);
1017 ASSERT(!xfs_is_metadir_inode(ip));
1018
1019 id = xfs_qm_id_for_quotatype(ip, type);
1020
1021restart:
1022 dqp = xfs_qm_dqget_cache_lookup(mp, qi, tree, id);
1023 if (dqp) {
1024 *O_dqpp = dqp;
1025 return 0;
1026 }
1027
1028 /*
1029 * Dquot cache miss. We don't want to keep the inode lock across
1030 * a (potential) disk read. Also we don't want to deal with the lock
1031 * ordering between quotainode and this inode. OTOH, dropping the inode
1032 * lock here means dealing with a chown that can happen before
1033 * we re-acquire the lock.
1034 */
1035 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1036 error = xfs_qm_dqread(mp, id, type, can_alloc, &dqp);
1037 xfs_ilock(ip, XFS_ILOCK_EXCL);
1038 if (error)
1039 return error;
1040
1041 /*
1042 * A dquot could be attached to this inode by now, since we had
1043 * dropped the ilock.
1044 */
1045 if (xfs_this_quota_on(mp, type)) {
1046 struct xfs_dquot *dqp1;
1047
1048 dqp1 = xfs_inode_dquot(ip, type);
1049 if (dqp1) {
1050 xfs_qm_dqdestroy(dqp);
1051 dqp = dqp1;
1052 xfs_dqlock(dqp);
1053 goto dqret;
1054 }
1055 } else {
1056 /* inode stays locked on return */
1057 xfs_qm_dqdestroy(dqp);
1058 return -ESRCH;
1059 }
1060
1061 error = xfs_qm_dqget_cache_insert(mp, qi, tree, id, dqp);
1062 if (error) {
1063 /*
1064 * Duplicate found. Just throw away the new dquot and start
1065 * over.
1066 */
1067 xfs_qm_dqdestroy(dqp);
1068 XFS_STATS_INC(mp, xs_qm_dquot_dups);
1069 goto restart;
1070 }
1071
1072dqret:
1073 xfs_assert_ilocked(ip, XFS_ILOCK_EXCL);
1074 trace_xfs_dqget_miss(dqp);
1075 *O_dqpp = dqp;
1076 return 0;
1077}
1078
1079/*
1080 * Starting at @id and progressing upwards, look for an initialized incore
1081 * dquot, lock it, and return it.
1082 */
1083int
1084xfs_qm_dqget_next(
1085 struct xfs_mount *mp,
1086 xfs_dqid_t id,
1087 xfs_dqtype_t type,
1088 struct xfs_dquot **dqpp)
1089{
1090 struct xfs_dquot *dqp;
1091 int error = 0;
1092
1093 *dqpp = NULL;
1094 for (; !error; error = xfs_dq_get_next_id(mp, type, &id)) {
1095 error = xfs_qm_dqget(mp, id, type, false, &dqp);
1096 if (error == -ENOENT)
1097 continue;
1098 else if (error != 0)
1099 break;
1100
1101 if (!XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
1102 *dqpp = dqp;
1103 return 0;
1104 }
1105
1106 xfs_qm_dqput(dqp);
1107 }
1108
1109 return error;
1110}
1111
1112/*
1113 * Release a reference to the dquot (decrement ref-count) and unlock it.
1114 *
1115 * If there is a group quota attached to this dquot, carefully release that
1116 * too without tripping over deadlocks'n'stuff.
1117 */
1118void
1119xfs_qm_dqput(
1120 struct xfs_dquot *dqp)
1121{
1122 ASSERT(dqp->q_nrefs > 0);
1123 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1124
1125 trace_xfs_dqput(dqp);
1126
1127 if (--dqp->q_nrefs == 0) {
1128 struct xfs_quotainfo *qi = dqp->q_mount->m_quotainfo;
1129 trace_xfs_dqput_free(dqp);
1130
1131 if (list_lru_add_obj(&qi->qi_lru, &dqp->q_lru))
1132 XFS_STATS_INC(dqp->q_mount, xs_qm_dquot_unused);
1133 }
1134 xfs_dqunlock(dqp);
1135}
1136
1137/*
1138 * Release a dquot. Flush it if dirty, then dqput() it.
1139 * dquot must not be locked.
1140 */
1141void
1142xfs_qm_dqrele(
1143 struct xfs_dquot *dqp)
1144{
1145 if (!dqp)
1146 return;
1147
1148 trace_xfs_dqrele(dqp);
1149
1150 xfs_dqlock(dqp);
1151 /*
1152 * We don't care to flush it if the dquot is dirty here.
1153 * That will create stutters that we want to avoid.
1154 * Instead we do a delayed write when we try to reclaim
1155 * a dirty dquot. Also xfs_sync will take part of the burden...
1156 */
1157 xfs_qm_dqput(dqp);
1158}
1159
1160/*
1161 * This is the dquot flushing I/O completion routine. It is called
1162 * from interrupt level when the buffer containing the dquot is
1163 * flushed to disk. It is responsible for removing the dquot logitem
1164 * from the AIL if it has not been re-logged, and unlocking the dquot's
1165 * flush lock. This behavior is very similar to that of inodes..
1166 */
1167static void
1168xfs_qm_dqflush_done(
1169 struct xfs_log_item *lip)
1170{
1171 struct xfs_dq_logitem *qlip =
1172 container_of(lip, struct xfs_dq_logitem, qli_item);
1173 struct xfs_dquot *dqp = qlip->qli_dquot;
1174 struct xfs_ail *ailp = lip->li_ailp;
1175 struct xfs_buf *bp = NULL;
1176 xfs_lsn_t tail_lsn;
1177
1178 /*
1179 * We only want to pull the item from the AIL if its
1180 * location in the log has not changed since we started the flush.
1181 * Thus, we only bother if the dquot's lsn has
1182 * not changed. First we check the lsn outside the lock
1183 * since it's cheaper, and then we recheck while
1184 * holding the lock before removing the dquot from the AIL.
1185 */
1186 if (test_bit(XFS_LI_IN_AIL, &lip->li_flags) &&
1187 (lip->li_lsn == qlip->qli_flush_lsn ||
1188 test_bit(XFS_LI_FAILED, &lip->li_flags))) {
1189
1190 spin_lock(&ailp->ail_lock);
1191 xfs_clear_li_failed(lip);
1192 if (lip->li_lsn == qlip->qli_flush_lsn) {
1193 /* xfs_ail_update_finish() drops the AIL lock */
1194 tail_lsn = xfs_ail_delete_one(ailp, lip);
1195 xfs_ail_update_finish(ailp, tail_lsn);
1196 } else {
1197 spin_unlock(&ailp->ail_lock);
1198 }
1199 }
1200
1201 /*
1202 * If this dquot hasn't been dirtied since initiating the last dqflush,
1203 * release the buffer reference. We already unlinked this dquot item
1204 * from the buffer.
1205 */
1206 spin_lock(&qlip->qli_lock);
1207 if (!qlip->qli_dirty) {
1208 bp = lip->li_buf;
1209 lip->li_buf = NULL;
1210 }
1211 spin_unlock(&qlip->qli_lock);
1212 if (bp)
1213 xfs_buf_rele(bp);
1214
1215 /*
1216 * Release the dq's flush lock since we're done with it.
1217 */
1218 xfs_dqfunlock(dqp);
1219}
1220
1221void
1222xfs_buf_dquot_iodone(
1223 struct xfs_buf *bp)
1224{
1225 struct xfs_log_item *lip, *n;
1226
1227 list_for_each_entry_safe(lip, n, &bp->b_li_list, li_bio_list) {
1228 list_del_init(&lip->li_bio_list);
1229 xfs_qm_dqflush_done(lip);
1230 }
1231}
1232
1233void
1234xfs_buf_dquot_io_fail(
1235 struct xfs_buf *bp)
1236{
1237 struct xfs_log_item *lip;
1238
1239 spin_lock(&bp->b_mount->m_ail->ail_lock);
1240 list_for_each_entry(lip, &bp->b_li_list, li_bio_list)
1241 set_bit(XFS_LI_FAILED, &lip->li_flags);
1242 spin_unlock(&bp->b_mount->m_ail->ail_lock);
1243}
1244
1245/* Check incore dquot for errors before we flush. */
1246static xfs_failaddr_t
1247xfs_qm_dqflush_check(
1248 struct xfs_dquot *dqp)
1249{
1250 xfs_dqtype_t type = xfs_dquot_type(dqp);
1251
1252 if (type != XFS_DQTYPE_USER &&
1253 type != XFS_DQTYPE_GROUP &&
1254 type != XFS_DQTYPE_PROJ)
1255 return __this_address;
1256
1257 if (dqp->q_id == 0)
1258 return NULL;
1259
1260 if (dqp->q_blk.softlimit && dqp->q_blk.count > dqp->q_blk.softlimit &&
1261 !dqp->q_blk.timer)
1262 return __this_address;
1263
1264 if (dqp->q_ino.softlimit && dqp->q_ino.count > dqp->q_ino.softlimit &&
1265 !dqp->q_ino.timer)
1266 return __this_address;
1267
1268 if (dqp->q_rtb.softlimit && dqp->q_rtb.count > dqp->q_rtb.softlimit &&
1269 !dqp->q_rtb.timer)
1270 return __this_address;
1271
1272 /* bigtime flag should never be set on root dquots */
1273 if (dqp->q_type & XFS_DQTYPE_BIGTIME) {
1274 if (!xfs_has_bigtime(dqp->q_mount))
1275 return __this_address;
1276 if (dqp->q_id == 0)
1277 return __this_address;
1278 }
1279
1280 return NULL;
1281}
1282
1283/*
1284 * Get the buffer containing the on-disk dquot.
1285 *
1286 * Requires dquot flush lock, will clear the dirty flag, delete the quota log
1287 * item from the AIL, and shut down the system if something goes wrong.
1288 */
1289static int
1290xfs_dquot_read_buf(
1291 struct xfs_trans *tp,
1292 struct xfs_dquot *dqp,
1293 struct xfs_buf **bpp)
1294{
1295 struct xfs_mount *mp = dqp->q_mount;
1296 struct xfs_buf *bp = NULL;
1297 int error;
1298
1299 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, dqp->q_blkno,
1300 mp->m_quotainfo->qi_dqchunklen, 0,
1301 &bp, &xfs_dquot_buf_ops);
1302 if (xfs_metadata_is_sick(error))
1303 xfs_dquot_mark_sick(dqp);
1304 if (error)
1305 goto out_abort;
1306
1307 *bpp = bp;
1308 return 0;
1309
1310out_abort:
1311 dqp->q_flags &= ~XFS_DQFLAG_DIRTY;
1312 xfs_trans_ail_delete(&dqp->q_logitem.qli_item, 0);
1313 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1314 return error;
1315}
1316
1317/*
1318 * Attach a dquot buffer to this dquot to avoid allocating a buffer during a
1319 * dqflush, since dqflush can be called from reclaim context. Caller must hold
1320 * the dqlock.
1321 */
1322int
1323xfs_dquot_attach_buf(
1324 struct xfs_trans *tp,
1325 struct xfs_dquot *dqp)
1326{
1327 struct xfs_dq_logitem *qlip = &dqp->q_logitem;
1328 struct xfs_log_item *lip = &qlip->qli_item;
1329 int error;
1330
1331 spin_lock(&qlip->qli_lock);
1332 if (!lip->li_buf) {
1333 struct xfs_buf *bp = NULL;
1334
1335 spin_unlock(&qlip->qli_lock);
1336 error = xfs_dquot_read_buf(tp, dqp, &bp);
1337 if (error)
1338 return error;
1339
1340 /*
1341 * Hold the dquot buffer so that we retain our ref to it after
1342 * detaching it from the transaction, then give that ref to the
1343 * dquot log item so that the AIL does not have to read the
1344 * dquot buffer to push this item.
1345 */
1346 xfs_buf_hold(bp);
1347 xfs_trans_brelse(tp, bp);
1348
1349 spin_lock(&qlip->qli_lock);
1350 lip->li_buf = bp;
1351 }
1352 qlip->qli_dirty = true;
1353 spin_unlock(&qlip->qli_lock);
1354
1355 return 0;
1356}
1357
1358/*
1359 * Get a new reference the dquot buffer attached to this dquot for a dqflush
1360 * operation.
1361 *
1362 * Returns 0 and a NULL bp if none was attached to the dquot; 0 and a locked
1363 * bp; or -EAGAIN if the buffer could not be locked.
1364 */
1365int
1366xfs_dquot_use_attached_buf(
1367 struct xfs_dquot *dqp,
1368 struct xfs_buf **bpp)
1369{
1370 struct xfs_buf *bp = dqp->q_logitem.qli_item.li_buf;
1371
1372 /*
1373 * A NULL buffer can happen if the dquot dirty flag was set but the
1374 * filesystem shut down before transaction commit happened. In that
1375 * case we're not going to flush anyway.
1376 */
1377 if (!bp) {
1378 ASSERT(xfs_is_shutdown(dqp->q_mount));
1379
1380 *bpp = NULL;
1381 return 0;
1382 }
1383
1384 if (!xfs_buf_trylock(bp))
1385 return -EAGAIN;
1386
1387 xfs_buf_hold(bp);
1388 *bpp = bp;
1389 return 0;
1390}
1391
1392/*
1393 * Write a modified dquot to disk.
1394 * The dquot must be locked and the flush lock too taken by caller.
1395 * The flush lock will not be unlocked until the dquot reaches the disk,
1396 * but the dquot is free to be unlocked and modified by the caller
1397 * in the interim. Dquot is still locked on return. This behavior is
1398 * identical to that of inodes.
1399 */
1400int
1401xfs_qm_dqflush(
1402 struct xfs_dquot *dqp,
1403 struct xfs_buf *bp)
1404{
1405 struct xfs_mount *mp = dqp->q_mount;
1406 struct xfs_dq_logitem *qlip = &dqp->q_logitem;
1407 struct xfs_log_item *lip = &qlip->qli_item;
1408 struct xfs_dqblk *dqblk;
1409 xfs_failaddr_t fa;
1410 int error;
1411
1412 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1413 ASSERT(!completion_done(&dqp->q_flush));
1414
1415 trace_xfs_dqflush(dqp);
1416
1417 xfs_qm_dqunpin_wait(dqp);
1418
1419 fa = xfs_qm_dqflush_check(dqp);
1420 if (fa) {
1421 xfs_alert(mp, "corrupt dquot ID 0x%x in memory at %pS",
1422 dqp->q_id, fa);
1423 xfs_dquot_mark_sick(dqp);
1424 error = -EFSCORRUPTED;
1425 goto out_abort;
1426 }
1427
1428 /* Flush the incore dquot to the ondisk buffer. */
1429 dqblk = xfs_buf_offset(bp, dqp->q_bufoffset);
1430 xfs_dquot_to_disk(&dqblk->dd_diskdq, dqp);
1431
1432 /*
1433 * Clear the dirty field and remember the flush lsn for later use.
1434 */
1435 dqp->q_flags &= ~XFS_DQFLAG_DIRTY;
1436
1437 /*
1438 * We hold the dquot lock, so nobody can dirty it while we're
1439 * scheduling the write out. Clear the dirty-since-flush flag.
1440 */
1441 spin_lock(&qlip->qli_lock);
1442 qlip->qli_dirty = false;
1443 spin_unlock(&qlip->qli_lock);
1444
1445 xfs_trans_ail_copy_lsn(mp->m_ail, &qlip->qli_flush_lsn, &lip->li_lsn);
1446
1447 /*
1448 * copy the lsn into the on-disk dquot now while we have the in memory
1449 * dquot here. This can't be done later in the write verifier as we
1450 * can't get access to the log item at that point in time.
1451 *
1452 * We also calculate the CRC here so that the on-disk dquot in the
1453 * buffer always has a valid CRC. This ensures there is no possibility
1454 * of a dquot without an up-to-date CRC getting to disk.
1455 */
1456 if (xfs_has_crc(mp)) {
1457 dqblk->dd_lsn = cpu_to_be64(lip->li_lsn);
1458 xfs_update_cksum((char *)dqblk, sizeof(struct xfs_dqblk),
1459 XFS_DQUOT_CRC_OFF);
1460 }
1461
1462 /*
1463 * Attach the dquot to the buffer so that we can remove this dquot from
1464 * the AIL and release the flush lock once the dquot is synced to disk.
1465 */
1466 bp->b_flags |= _XBF_DQUOTS;
1467 list_add_tail(&lip->li_bio_list, &bp->b_li_list);
1468
1469 /*
1470 * If the buffer is pinned then push on the log so we won't
1471 * get stuck waiting in the write for too long.
1472 */
1473 if (xfs_buf_ispinned(bp)) {
1474 trace_xfs_dqflush_force(dqp);
1475 xfs_log_force(mp, 0);
1476 }
1477
1478 trace_xfs_dqflush_done(dqp);
1479 return 0;
1480
1481out_abort:
1482 dqp->q_flags &= ~XFS_DQFLAG_DIRTY;
1483 xfs_trans_ail_delete(lip, 0);
1484 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1485 xfs_dqfunlock(dqp);
1486 return error;
1487}
1488
1489/*
1490 * Lock two xfs_dquot structures.
1491 *
1492 * To avoid deadlocks we always lock the quota structure with
1493 * the lowerd id first.
1494 */
1495void
1496xfs_dqlock2(
1497 struct xfs_dquot *d1,
1498 struct xfs_dquot *d2)
1499{
1500 if (d1 && d2) {
1501 ASSERT(d1 != d2);
1502 if (d1->q_id > d2->q_id) {
1503 mutex_lock(&d2->q_qlock);
1504 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
1505 } else {
1506 mutex_lock(&d1->q_qlock);
1507 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
1508 }
1509 } else if (d1) {
1510 mutex_lock(&d1->q_qlock);
1511 } else if (d2) {
1512 mutex_lock(&d2->q_qlock);
1513 }
1514}
1515
1516static int
1517xfs_dqtrx_cmp(
1518 const void *a,
1519 const void *b)
1520{
1521 const struct xfs_dqtrx *qa = a;
1522 const struct xfs_dqtrx *qb = b;
1523
1524 if (qa->qt_dquot->q_id > qb->qt_dquot->q_id)
1525 return 1;
1526 if (qa->qt_dquot->q_id < qb->qt_dquot->q_id)
1527 return -1;
1528 return 0;
1529}
1530
1531void
1532xfs_dqlockn(
1533 struct xfs_dqtrx *q)
1534{
1535 unsigned int i;
1536
1537 BUILD_BUG_ON(XFS_QM_TRANS_MAXDQS > MAX_LOCKDEP_SUBCLASSES);
1538
1539 /* Sort in order of dquot id, do not allow duplicates */
1540 for (i = 0; i < XFS_QM_TRANS_MAXDQS && q[i].qt_dquot != NULL; i++) {
1541 unsigned int j;
1542
1543 for (j = 0; j < i; j++)
1544 ASSERT(q[i].qt_dquot != q[j].qt_dquot);
1545 }
1546 if (i == 0)
1547 return;
1548
1549 sort(q, i, sizeof(struct xfs_dqtrx), xfs_dqtrx_cmp, NULL);
1550
1551 mutex_lock(&q[0].qt_dquot->q_qlock);
1552 for (i = 1; i < XFS_QM_TRANS_MAXDQS && q[i].qt_dquot != NULL; i++)
1553 mutex_lock_nested(&q[i].qt_dquot->q_qlock,
1554 XFS_QLOCK_NESTED + i - 1);
1555}
1556
1557int __init
1558xfs_qm_init(void)
1559{
1560 xfs_dquot_cache = kmem_cache_create("xfs_dquot",
1561 sizeof(struct xfs_dquot),
1562 0, 0, NULL);
1563 if (!xfs_dquot_cache)
1564 goto out;
1565
1566 xfs_dqtrx_cache = kmem_cache_create("xfs_dqtrx",
1567 sizeof(struct xfs_dquot_acct),
1568 0, 0, NULL);
1569 if (!xfs_dqtrx_cache)
1570 goto out_free_dquot_cache;
1571
1572 return 0;
1573
1574out_free_dquot_cache:
1575 kmem_cache_destroy(xfs_dquot_cache);
1576out:
1577 return -ENOMEM;
1578}
1579
1580void
1581xfs_qm_exit(void)
1582{
1583 kmem_cache_destroy(xfs_dqtrx_cache);
1584 kmem_cache_destroy(xfs_dquot_cache);
1585}