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_dir2.h"
27 #include "xfs_alloc.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_quota.h"
30 #include "xfs_mount.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_alloc_btree.h"
33 #include "xfs_ialloc_btree.h"
34 #include "xfs_dir2_sf.h"
35 #include "xfs_attr_sf.h"
36 #include "xfs_dinode.h"
37 #include "xfs_inode.h"
38 #include "xfs_btree.h"
39 #include "xfs_ialloc.h"
40 #include "xfs_bmap.h"
41 #include "xfs_rtalloc.h"
42 #include "xfs_error.h"
43 #include "xfs_itable.h"
44 #include "xfs_rw.h"
45 #include "xfs_acl.h"
46 #include "xfs_attr.h"
47 #include "xfs_buf_item.h"
48 #include "xfs_trans_space.h"
49 #include "xfs_trans_priv.h"
50 #include "xfs_qm.h"
51
52
53 /*
54 LOCK ORDER
55
56 inode lock (ilock)
57 dquot hash-chain lock (hashlock)
58 xqm dquot freelist lock (freelistlock
59 mount's dquot list lock (mplistlock)
60 user dquot lock - lock ordering among dquots is based on the uid or gid
61 group dquot lock - similar to udquots. Between the two dquots, the udquot
62 has to be locked first.
63 pin lock - the dquot lock must be held to take this lock.
64 flush lock - ditto.
65 */
66
67 STATIC void xfs_qm_dqflush_done(xfs_buf_t *, xfs_dq_logitem_t *);
68
69 #ifdef DEBUG
70 xfs_buftarg_t *xfs_dqerror_target;
71 int xfs_do_dqerror;
72 int xfs_dqreq_num;
73 int xfs_dqerror_mod = 33;
74 #endif
75
76 static struct lock_class_key xfs_dquot_other_class;
77
78 /*
79 * Allocate and initialize a dquot. We don't always allocate fresh memory;
80 * we try to reclaim a free dquot if the number of incore dquots are above
81 * a threshold.
82 * The only field inside the core that gets initialized at this point
83 * is the d_id field. The idea is to fill in the entire q_core
84 * when we read in the on disk dquot.
85 */
86 STATIC xfs_dquot_t *
xfs_qm_dqinit(xfs_mount_t * mp,xfs_dqid_t id,uint type)87 xfs_qm_dqinit(
88 xfs_mount_t *mp,
89 xfs_dqid_t id,
90 uint type)
91 {
92 xfs_dquot_t *dqp;
93 boolean_t brandnewdquot;
94
95 brandnewdquot = xfs_qm_dqalloc_incore(&dqp);
96 dqp->dq_flags = type;
97 dqp->q_core.d_id = cpu_to_be32(id);
98 dqp->q_mount = mp;
99
100 /*
101 * No need to re-initialize these if this is a reclaimed dquot.
102 */
103 if (brandnewdquot) {
104 dqp->dq_flnext = dqp->dq_flprev = dqp;
105 mutex_init(&dqp->q_qlock);
106 init_waitqueue_head(&dqp->q_pinwait);
107
108 /*
109 * Because we want to use a counting completion, complete
110 * the flush completion once to allow a single access to
111 * the flush completion without blocking.
112 */
113 init_completion(&dqp->q_flush);
114 complete(&dqp->q_flush);
115
116 #ifdef XFS_DQUOT_TRACE
117 dqp->q_trace = ktrace_alloc(DQUOT_TRACE_SIZE, KM_NOFS);
118 xfs_dqtrace_entry(dqp, "DQINIT");
119 #endif
120 } else {
121 /*
122 * Only the q_core portion was zeroed in dqreclaim_one().
123 * So, we need to reset others.
124 */
125 dqp->q_nrefs = 0;
126 dqp->q_blkno = 0;
127 dqp->MPL_NEXT = dqp->HL_NEXT = NULL;
128 dqp->HL_PREVP = dqp->MPL_PREVP = NULL;
129 dqp->q_bufoffset = 0;
130 dqp->q_fileoffset = 0;
131 dqp->q_transp = NULL;
132 dqp->q_gdquot = NULL;
133 dqp->q_res_bcount = 0;
134 dqp->q_res_icount = 0;
135 dqp->q_res_rtbcount = 0;
136 atomic_set(&dqp->q_pincount, 0);
137 dqp->q_hash = NULL;
138 ASSERT(dqp->dq_flnext == dqp->dq_flprev);
139
140 #ifdef XFS_DQUOT_TRACE
141 ASSERT(dqp->q_trace);
142 xfs_dqtrace_entry(dqp, "DQRECLAIMED_INIT");
143 #endif
144 }
145
146 /*
147 * In either case we need to make sure group quotas have a different
148 * lock class than user quotas, to make sure lockdep knows we can
149 * locks of one of each at the same time.
150 */
151 if (!(type & XFS_DQ_USER))
152 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_other_class);
153
154 /*
155 * log item gets initialized later
156 */
157 return (dqp);
158 }
159
160 /*
161 * This is called to free all the memory associated with a dquot
162 */
163 void
xfs_qm_dqdestroy(xfs_dquot_t * dqp)164 xfs_qm_dqdestroy(
165 xfs_dquot_t *dqp)
166 {
167 ASSERT(! XFS_DQ_IS_ON_FREELIST(dqp));
168
169 mutex_destroy(&dqp->q_qlock);
170 sv_destroy(&dqp->q_pinwait);
171
172 #ifdef XFS_DQUOT_TRACE
173 if (dqp->q_trace)
174 ktrace_free(dqp->q_trace);
175 dqp->q_trace = NULL;
176 #endif
177 kmem_zone_free(xfs_Gqm->qm_dqzone, dqp);
178 atomic_dec(&xfs_Gqm->qm_totaldquots);
179 }
180
181 /*
182 * This is what a 'fresh' dquot inside a dquot chunk looks like on disk.
183 */
184 STATIC void
xfs_qm_dqinit_core(xfs_dqid_t id,uint type,xfs_dqblk_t * d)185 xfs_qm_dqinit_core(
186 xfs_dqid_t id,
187 uint type,
188 xfs_dqblk_t *d)
189 {
190 /*
191 * Caller has zero'd the entire dquot 'chunk' already.
192 */
193 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
194 d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
195 d->dd_diskdq.d_id = cpu_to_be32(id);
196 d->dd_diskdq.d_flags = type;
197 }
198
199
200 #ifdef XFS_DQUOT_TRACE
201 /*
202 * Dquot tracing for debugging.
203 */
204 /* ARGSUSED */
205 void
__xfs_dqtrace_entry(xfs_dquot_t * dqp,char * func,void * retaddr,xfs_inode_t * ip)206 __xfs_dqtrace_entry(
207 xfs_dquot_t *dqp,
208 char *func,
209 void *retaddr,
210 xfs_inode_t *ip)
211 {
212 xfs_dquot_t *udqp = NULL;
213 xfs_ino_t ino = 0;
214
215 ASSERT(dqp->q_trace);
216 if (ip) {
217 ino = ip->i_ino;
218 udqp = ip->i_udquot;
219 }
220 ktrace_enter(dqp->q_trace,
221 (void *)(__psint_t)DQUOT_KTRACE_ENTRY,
222 (void *)func,
223 (void *)(__psint_t)dqp->q_nrefs,
224 (void *)(__psint_t)dqp->dq_flags,
225 (void *)(__psint_t)dqp->q_res_bcount,
226 (void *)(__psint_t)be64_to_cpu(dqp->q_core.d_bcount),
227 (void *)(__psint_t)be64_to_cpu(dqp->q_core.d_icount),
228 (void *)(__psint_t)be64_to_cpu(dqp->q_core.d_blk_hardlimit),
229 (void *)(__psint_t)be64_to_cpu(dqp->q_core.d_blk_softlimit),
230 (void *)(__psint_t)be64_to_cpu(dqp->q_core.d_ino_hardlimit),
231 (void *)(__psint_t)be64_to_cpu(dqp->q_core.d_ino_softlimit),
232 (void *)(__psint_t)be32_to_cpu(dqp->q_core.d_id),
233 (void *)(__psint_t)current_pid(),
234 (void *)(__psint_t)ino,
235 (void *)(__psint_t)retaddr,
236 (void *)(__psint_t)udqp);
237 return;
238 }
239 #endif
240
241
242 /*
243 * If default limits are in force, push them into the dquot now.
244 * We overwrite the dquot limits only if they are zero and this
245 * is not the root dquot.
246 */
247 void
xfs_qm_adjust_dqlimits(xfs_mount_t * mp,xfs_disk_dquot_t * d)248 xfs_qm_adjust_dqlimits(
249 xfs_mount_t *mp,
250 xfs_disk_dquot_t *d)
251 {
252 xfs_quotainfo_t *q = mp->m_quotainfo;
253
254 ASSERT(d->d_id);
255
256 if (q->qi_bsoftlimit && !d->d_blk_softlimit)
257 d->d_blk_softlimit = cpu_to_be64(q->qi_bsoftlimit);
258 if (q->qi_bhardlimit && !d->d_blk_hardlimit)
259 d->d_blk_hardlimit = cpu_to_be64(q->qi_bhardlimit);
260 if (q->qi_isoftlimit && !d->d_ino_softlimit)
261 d->d_ino_softlimit = cpu_to_be64(q->qi_isoftlimit);
262 if (q->qi_ihardlimit && !d->d_ino_hardlimit)
263 d->d_ino_hardlimit = cpu_to_be64(q->qi_ihardlimit);
264 if (q->qi_rtbsoftlimit && !d->d_rtb_softlimit)
265 d->d_rtb_softlimit = cpu_to_be64(q->qi_rtbsoftlimit);
266 if (q->qi_rtbhardlimit && !d->d_rtb_hardlimit)
267 d->d_rtb_hardlimit = cpu_to_be64(q->qi_rtbhardlimit);
268 }
269
270 /*
271 * Check the limits and timers of a dquot and start or reset timers
272 * if necessary.
273 * This gets called even when quota enforcement is OFF, which makes our
274 * life a little less complicated. (We just don't reject any quota
275 * reservations in that case, when enforcement is off).
276 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when
277 * enforcement's off.
278 * In contrast, warnings are a little different in that they don't
279 * 'automatically' get started when limits get exceeded. They do
280 * get reset to zero, however, when we find the count to be under
281 * the soft limit (they are only ever set non-zero via userspace).
282 */
283 void
xfs_qm_adjust_dqtimers(xfs_mount_t * mp,xfs_disk_dquot_t * d)284 xfs_qm_adjust_dqtimers(
285 xfs_mount_t *mp,
286 xfs_disk_dquot_t *d)
287 {
288 ASSERT(d->d_id);
289
290 #ifdef QUOTADEBUG
291 if (d->d_blk_hardlimit)
292 ASSERT(be64_to_cpu(d->d_blk_softlimit) <=
293 be64_to_cpu(d->d_blk_hardlimit));
294 if (d->d_ino_hardlimit)
295 ASSERT(be64_to_cpu(d->d_ino_softlimit) <=
296 be64_to_cpu(d->d_ino_hardlimit));
297 if (d->d_rtb_hardlimit)
298 ASSERT(be64_to_cpu(d->d_rtb_softlimit) <=
299 be64_to_cpu(d->d_rtb_hardlimit));
300 #endif
301 if (!d->d_btimer) {
302 if ((d->d_blk_softlimit &&
303 (be64_to_cpu(d->d_bcount) >=
304 be64_to_cpu(d->d_blk_softlimit))) ||
305 (d->d_blk_hardlimit &&
306 (be64_to_cpu(d->d_bcount) >=
307 be64_to_cpu(d->d_blk_hardlimit)))) {
308 d->d_btimer = cpu_to_be32(get_seconds() +
309 XFS_QI_BTIMELIMIT(mp));
310 } else {
311 d->d_bwarns = 0;
312 }
313 } else {
314 if ((!d->d_blk_softlimit ||
315 (be64_to_cpu(d->d_bcount) <
316 be64_to_cpu(d->d_blk_softlimit))) &&
317 (!d->d_blk_hardlimit ||
318 (be64_to_cpu(d->d_bcount) <
319 be64_to_cpu(d->d_blk_hardlimit)))) {
320 d->d_btimer = 0;
321 }
322 }
323
324 if (!d->d_itimer) {
325 if ((d->d_ino_softlimit &&
326 (be64_to_cpu(d->d_icount) >=
327 be64_to_cpu(d->d_ino_softlimit))) ||
328 (d->d_ino_hardlimit &&
329 (be64_to_cpu(d->d_icount) >=
330 be64_to_cpu(d->d_ino_hardlimit)))) {
331 d->d_itimer = cpu_to_be32(get_seconds() +
332 XFS_QI_ITIMELIMIT(mp));
333 } else {
334 d->d_iwarns = 0;
335 }
336 } else {
337 if ((!d->d_ino_softlimit ||
338 (be64_to_cpu(d->d_icount) <
339 be64_to_cpu(d->d_ino_softlimit))) &&
340 (!d->d_ino_hardlimit ||
341 (be64_to_cpu(d->d_icount) <
342 be64_to_cpu(d->d_ino_hardlimit)))) {
343 d->d_itimer = 0;
344 }
345 }
346
347 if (!d->d_rtbtimer) {
348 if ((d->d_rtb_softlimit &&
349 (be64_to_cpu(d->d_rtbcount) >=
350 be64_to_cpu(d->d_rtb_softlimit))) ||
351 (d->d_rtb_hardlimit &&
352 (be64_to_cpu(d->d_rtbcount) >=
353 be64_to_cpu(d->d_rtb_hardlimit)))) {
354 d->d_rtbtimer = cpu_to_be32(get_seconds() +
355 XFS_QI_RTBTIMELIMIT(mp));
356 } else {
357 d->d_rtbwarns = 0;
358 }
359 } else {
360 if ((!d->d_rtb_softlimit ||
361 (be64_to_cpu(d->d_rtbcount) <
362 be64_to_cpu(d->d_rtb_softlimit))) &&
363 (!d->d_rtb_hardlimit ||
364 (be64_to_cpu(d->d_rtbcount) <
365 be64_to_cpu(d->d_rtb_hardlimit)))) {
366 d->d_rtbtimer = 0;
367 }
368 }
369 }
370
371 /*
372 * initialize a buffer full of dquots and log the whole thing
373 */
374 STATIC void
xfs_qm_init_dquot_blk(xfs_trans_t * tp,xfs_mount_t * mp,xfs_dqid_t id,uint type,xfs_buf_t * bp)375 xfs_qm_init_dquot_blk(
376 xfs_trans_t *tp,
377 xfs_mount_t *mp,
378 xfs_dqid_t id,
379 uint type,
380 xfs_buf_t *bp)
381 {
382 xfs_dqblk_t *d;
383 int curid, i;
384
385 ASSERT(tp);
386 ASSERT(XFS_BUF_ISBUSY(bp));
387 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
388
389 d = (xfs_dqblk_t *)XFS_BUF_PTR(bp);
390
391 /*
392 * ID of the first dquot in the block - id's are zero based.
393 */
394 curid = id - (id % XFS_QM_DQPERBLK(mp));
395 ASSERT(curid >= 0);
396 memset(d, 0, BBTOB(XFS_QI_DQCHUNKLEN(mp)));
397 for (i = 0; i < XFS_QM_DQPERBLK(mp); i++, d++, curid++)
398 xfs_qm_dqinit_core(curid, type, d);
399 xfs_trans_dquot_buf(tp, bp,
400 (type & XFS_DQ_USER ? XFS_BLI_UDQUOT_BUF :
401 ((type & XFS_DQ_PROJ) ? XFS_BLI_PDQUOT_BUF :
402 XFS_BLI_GDQUOT_BUF)));
403 xfs_trans_log_buf(tp, bp, 0, BBTOB(XFS_QI_DQCHUNKLEN(mp)) - 1);
404 }
405
406
407
408 /*
409 * Allocate a block and fill it with dquots.
410 * This is called when the bmapi finds a hole.
411 */
412 STATIC int
xfs_qm_dqalloc(xfs_trans_t ** tpp,xfs_mount_t * mp,xfs_dquot_t * dqp,xfs_inode_t * quotip,xfs_fileoff_t offset_fsb,xfs_buf_t ** O_bpp)413 xfs_qm_dqalloc(
414 xfs_trans_t **tpp,
415 xfs_mount_t *mp,
416 xfs_dquot_t *dqp,
417 xfs_inode_t *quotip,
418 xfs_fileoff_t offset_fsb,
419 xfs_buf_t **O_bpp)
420 {
421 xfs_fsblock_t firstblock;
422 xfs_bmap_free_t flist;
423 xfs_bmbt_irec_t map;
424 int nmaps, error, committed;
425 xfs_buf_t *bp;
426 xfs_trans_t *tp = *tpp;
427
428 ASSERT(tp != NULL);
429 xfs_dqtrace_entry(dqp, "DQALLOC");
430
431 /*
432 * Initialize the bmap freelist prior to calling bmapi code.
433 */
434 xfs_bmap_init(&flist, &firstblock);
435 xfs_ilock(quotip, XFS_ILOCK_EXCL);
436 /*
437 * Return if this type of quotas is turned off while we didn't
438 * have an inode lock
439 */
440 if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
441 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
442 return (ESRCH);
443 }
444
445 /*
446 * xfs_trans_commit normally decrements the vnode ref count
447 * when it unlocks the inode. Since we want to keep the quota
448 * inode around, we bump the vnode ref count now.
449 */
450 IHOLD(quotip);
451
452 xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL);
453 nmaps = 1;
454 if ((error = xfs_bmapi(tp, quotip,
455 offset_fsb, XFS_DQUOT_CLUSTER_SIZE_FSB,
456 XFS_BMAPI_METADATA | XFS_BMAPI_WRITE,
457 &firstblock,
458 XFS_QM_DQALLOC_SPACE_RES(mp),
459 &map, &nmaps, &flist, NULL))) {
460 goto error0;
461 }
462 ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
463 ASSERT(nmaps == 1);
464 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
465 (map.br_startblock != HOLESTARTBLOCK));
466
467 /*
468 * Keep track of the blkno to save a lookup later
469 */
470 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
471
472 /* now we can just get the buffer (there's nothing to read yet) */
473 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
474 dqp->q_blkno,
475 XFS_QI_DQCHUNKLEN(mp),
476 0);
477 if (!bp || (error = XFS_BUF_GETERROR(bp)))
478 goto error1;
479 /*
480 * Make a chunk of dquots out of this buffer and log
481 * the entire thing.
482 */
483 xfs_qm_init_dquot_blk(tp, mp, be32_to_cpu(dqp->q_core.d_id),
484 dqp->dq_flags & XFS_DQ_ALLTYPES, bp);
485
486 /*
487 * xfs_bmap_finish() may commit the current transaction and
488 * start a second transaction if the freelist is not empty.
489 *
490 * Since we still want to modify this buffer, we need to
491 * ensure that the buffer is not released on commit of
492 * the first transaction and ensure the buffer is added to the
493 * second transaction.
494 *
495 * If there is only one transaction then don't stop the buffer
496 * from being released when it commits later on.
497 */
498
499 xfs_trans_bhold(tp, bp);
500
501 if ((error = xfs_bmap_finish(tpp, &flist, &committed))) {
502 goto error1;
503 }
504
505 if (committed) {
506 tp = *tpp;
507 xfs_trans_bjoin(tp, bp);
508 } else {
509 xfs_trans_bhold_release(tp, bp);
510 }
511
512 *O_bpp = bp;
513 return 0;
514
515 error1:
516 xfs_bmap_cancel(&flist);
517 error0:
518 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
519
520 return (error);
521 }
522
523 /*
524 * Maps a dquot to the buffer containing its on-disk version.
525 * This returns a ptr to the buffer containing the on-disk dquot
526 * in the bpp param, and a ptr to the on-disk dquot within that buffer
527 */
528 STATIC int
xfs_qm_dqtobp(xfs_trans_t ** tpp,xfs_dquot_t * dqp,xfs_disk_dquot_t ** O_ddpp,xfs_buf_t ** O_bpp,uint flags)529 xfs_qm_dqtobp(
530 xfs_trans_t **tpp,
531 xfs_dquot_t *dqp,
532 xfs_disk_dquot_t **O_ddpp,
533 xfs_buf_t **O_bpp,
534 uint flags)
535 {
536 xfs_bmbt_irec_t map;
537 int nmaps, error;
538 xfs_buf_t *bp;
539 xfs_inode_t *quotip;
540 xfs_mount_t *mp;
541 xfs_disk_dquot_t *ddq;
542 xfs_dqid_t id;
543 boolean_t newdquot;
544 xfs_trans_t *tp = (tpp ? *tpp : NULL);
545
546 mp = dqp->q_mount;
547 id = be32_to_cpu(dqp->q_core.d_id);
548 nmaps = 1;
549 newdquot = B_FALSE;
550
551 /*
552 * If we don't know where the dquot lives, find out.
553 */
554 if (dqp->q_blkno == (xfs_daddr_t) 0) {
555 /* We use the id as an index */
556 dqp->q_fileoffset = (xfs_fileoff_t)id / XFS_QM_DQPERBLK(mp);
557 nmaps = 1;
558 quotip = XFS_DQ_TO_QIP(dqp);
559 xfs_ilock(quotip, XFS_ILOCK_SHARED);
560 /*
561 * Return if this type of quotas is turned off while we didn't
562 * have an inode lock
563 */
564 if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
565 xfs_iunlock(quotip, XFS_ILOCK_SHARED);
566 return (ESRCH);
567 }
568 /*
569 * Find the block map; no allocations yet
570 */
571 error = xfs_bmapi(NULL, quotip, dqp->q_fileoffset,
572 XFS_DQUOT_CLUSTER_SIZE_FSB,
573 XFS_BMAPI_METADATA,
574 NULL, 0, &map, &nmaps, NULL, NULL);
575
576 xfs_iunlock(quotip, XFS_ILOCK_SHARED);
577 if (error)
578 return (error);
579 ASSERT(nmaps == 1);
580 ASSERT(map.br_blockcount == 1);
581
582 /*
583 * offset of dquot in the (fixed sized) dquot chunk.
584 */
585 dqp->q_bufoffset = (id % XFS_QM_DQPERBLK(mp)) *
586 sizeof(xfs_dqblk_t);
587 if (map.br_startblock == HOLESTARTBLOCK) {
588 /*
589 * We don't allocate unless we're asked to
590 */
591 if (!(flags & XFS_QMOPT_DQALLOC))
592 return (ENOENT);
593
594 ASSERT(tp);
595 if ((error = xfs_qm_dqalloc(tpp, mp, dqp, quotip,
596 dqp->q_fileoffset, &bp)))
597 return (error);
598 tp = *tpp;
599 newdquot = B_TRUE;
600 } else {
601 /*
602 * store the blkno etc so that we don't have to do the
603 * mapping all the time
604 */
605 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
606 }
607 }
608 ASSERT(dqp->q_blkno != DELAYSTARTBLOCK);
609 ASSERT(dqp->q_blkno != HOLESTARTBLOCK);
610
611 /*
612 * Read in the buffer, unless we've just done the allocation
613 * (in which case we already have the buf).
614 */
615 if (! newdquot) {
616 xfs_dqtrace_entry(dqp, "DQTOBP READBUF");
617 if ((error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
618 dqp->q_blkno,
619 XFS_QI_DQCHUNKLEN(mp),
620 0, &bp))) {
621 return (error);
622 }
623 if (error || !bp)
624 return XFS_ERROR(error);
625 }
626 ASSERT(XFS_BUF_ISBUSY(bp));
627 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
628
629 /*
630 * calculate the location of the dquot inside the buffer.
631 */
632 ddq = (xfs_disk_dquot_t *)((char *)XFS_BUF_PTR(bp) + dqp->q_bufoffset);
633
634 /*
635 * A simple sanity check in case we got a corrupted dquot...
636 */
637 if (xfs_qm_dqcheck(ddq, id, dqp->dq_flags & XFS_DQ_ALLTYPES,
638 flags & (XFS_QMOPT_DQREPAIR|XFS_QMOPT_DOWARN),
639 "dqtobp")) {
640 if (!(flags & XFS_QMOPT_DQREPAIR)) {
641 xfs_trans_brelse(tp, bp);
642 return XFS_ERROR(EIO);
643 }
644 XFS_BUF_BUSY(bp); /* We dirtied this */
645 }
646
647 *O_bpp = bp;
648 *O_ddpp = ddq;
649
650 return (0);
651 }
652
653
654 /*
655 * Read in the ondisk dquot using dqtobp() then copy it to an incore version,
656 * and release the buffer immediately.
657 *
658 */
659 /* ARGSUSED */
660 STATIC int
xfs_qm_dqread(xfs_trans_t ** tpp,xfs_dqid_t id,xfs_dquot_t * dqp,uint flags)661 xfs_qm_dqread(
662 xfs_trans_t **tpp,
663 xfs_dqid_t id,
664 xfs_dquot_t *dqp, /* dquot to get filled in */
665 uint flags)
666 {
667 xfs_disk_dquot_t *ddqp;
668 xfs_buf_t *bp;
669 int error;
670 xfs_trans_t *tp;
671
672 ASSERT(tpp);
673
674 /*
675 * get a pointer to the on-disk dquot and the buffer containing it
676 * dqp already knows its own type (GROUP/USER).
677 */
678 xfs_dqtrace_entry(dqp, "DQREAD");
679 if ((error = xfs_qm_dqtobp(tpp, dqp, &ddqp, &bp, flags))) {
680 return (error);
681 }
682 tp = *tpp;
683
684 /* copy everything from disk dquot to the incore dquot */
685 memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t));
686 ASSERT(be32_to_cpu(dqp->q_core.d_id) == id);
687 xfs_qm_dquot_logitem_init(dqp);
688
689 /*
690 * Reservation counters are defined as reservation plus current usage
691 * to avoid having to add everytime.
692 */
693 dqp->q_res_bcount = be64_to_cpu(ddqp->d_bcount);
694 dqp->q_res_icount = be64_to_cpu(ddqp->d_icount);
695 dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount);
696
697 /* Mark the buf so that this will stay incore a little longer */
698 XFS_BUF_SET_VTYPE_REF(bp, B_FS_DQUOT, XFS_DQUOT_REF);
699
700 /*
701 * We got the buffer with a xfs_trans_read_buf() (in dqtobp())
702 * So we need to release with xfs_trans_brelse().
703 * The strategy here is identical to that of inodes; we lock
704 * the dquot in xfs_qm_dqget() before making it accessible to
705 * others. This is because dquots, like inodes, need a good level of
706 * concurrency, and we don't want to take locks on the entire buffers
707 * for dquot accesses.
708 * Note also that the dquot buffer may even be dirty at this point, if
709 * this particular dquot was repaired. We still aren't afraid to
710 * brelse it because we have the changes incore.
711 */
712 ASSERT(XFS_BUF_ISBUSY(bp));
713 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
714 xfs_trans_brelse(tp, bp);
715
716 return (error);
717 }
718
719
720 /*
721 * allocate an incore dquot from the kernel heap,
722 * and fill its core with quota information kept on disk.
723 * If XFS_QMOPT_DQALLOC is set, it'll allocate a dquot on disk
724 * if it wasn't already allocated.
725 */
726 STATIC int
xfs_qm_idtodq(xfs_mount_t * mp,xfs_dqid_t id,uint type,uint flags,xfs_dquot_t ** O_dqpp)727 xfs_qm_idtodq(
728 xfs_mount_t *mp,
729 xfs_dqid_t id, /* gid or uid, depending on type */
730 uint type, /* UDQUOT or GDQUOT */
731 uint flags, /* DQALLOC, DQREPAIR */
732 xfs_dquot_t **O_dqpp)/* OUT : incore dquot, not locked */
733 {
734 xfs_dquot_t *dqp;
735 int error;
736 xfs_trans_t *tp;
737 int cancelflags=0;
738
739 dqp = xfs_qm_dqinit(mp, id, type);
740 tp = NULL;
741 if (flags & XFS_QMOPT_DQALLOC) {
742 tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC);
743 if ((error = xfs_trans_reserve(tp,
744 XFS_QM_DQALLOC_SPACE_RES(mp),
745 XFS_WRITE_LOG_RES(mp) +
746 BBTOB(XFS_QI_DQCHUNKLEN(mp)) - 1 +
747 128,
748 0,
749 XFS_TRANS_PERM_LOG_RES,
750 XFS_WRITE_LOG_COUNT))) {
751 cancelflags = 0;
752 goto error0;
753 }
754 cancelflags = XFS_TRANS_RELEASE_LOG_RES;
755 }
756
757 /*
758 * Read it from disk; xfs_dqread() takes care of
759 * all the necessary initialization of dquot's fields (locks, etc)
760 */
761 if ((error = xfs_qm_dqread(&tp, id, dqp, flags))) {
762 /*
763 * This can happen if quotas got turned off (ESRCH),
764 * or if the dquot didn't exist on disk and we ask to
765 * allocate (ENOENT).
766 */
767 xfs_dqtrace_entry(dqp, "DQREAD FAIL");
768 cancelflags |= XFS_TRANS_ABORT;
769 goto error0;
770 }
771 if (tp) {
772 if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES)))
773 goto error1;
774 }
775
776 *O_dqpp = dqp;
777 return (0);
778
779 error0:
780 ASSERT(error);
781 if (tp)
782 xfs_trans_cancel(tp, cancelflags);
783 error1:
784 xfs_qm_dqdestroy(dqp);
785 *O_dqpp = NULL;
786 return (error);
787 }
788
789 /*
790 * Lookup a dquot in the incore dquot hashtable. We keep two separate
791 * hashtables for user and group dquots; and, these are global tables
792 * inside the XQM, not per-filesystem tables.
793 * The hash chain must be locked by caller, and it is left locked
794 * on return. Returning dquot is locked.
795 */
796 STATIC int
xfs_qm_dqlookup(xfs_mount_t * mp,xfs_dqid_t id,xfs_dqhash_t * qh,xfs_dquot_t ** O_dqpp)797 xfs_qm_dqlookup(
798 xfs_mount_t *mp,
799 xfs_dqid_t id,
800 xfs_dqhash_t *qh,
801 xfs_dquot_t **O_dqpp)
802 {
803 xfs_dquot_t *dqp;
804 uint flist_locked;
805 xfs_dquot_t *d;
806
807 ASSERT(XFS_DQ_IS_HASH_LOCKED(qh));
808
809 flist_locked = B_FALSE;
810
811 /*
812 * Traverse the hashchain looking for a match
813 */
814 for (dqp = qh->qh_next; dqp != NULL; dqp = dqp->HL_NEXT) {
815 /*
816 * We already have the hashlock. We don't need the
817 * dqlock to look at the id field of the dquot, since the
818 * id can't be modified without the hashlock anyway.
819 */
820 if (be32_to_cpu(dqp->q_core.d_id) == id && dqp->q_mount == mp) {
821 xfs_dqtrace_entry(dqp, "DQFOUND BY LOOKUP");
822 /*
823 * All in core dquots must be on the dqlist of mp
824 */
825 ASSERT(dqp->MPL_PREVP != NULL);
826
827 xfs_dqlock(dqp);
828 if (dqp->q_nrefs == 0) {
829 ASSERT (XFS_DQ_IS_ON_FREELIST(dqp));
830 if (! xfs_qm_freelist_lock_nowait(xfs_Gqm)) {
831 xfs_dqtrace_entry(dqp, "DQLOOKUP: WANT");
832
833 /*
834 * We may have raced with dqreclaim_one()
835 * (and lost). So, flag that we don't
836 * want the dquot to be reclaimed.
837 */
838 dqp->dq_flags |= XFS_DQ_WANT;
839 xfs_dqunlock(dqp);
840 xfs_qm_freelist_lock(xfs_Gqm);
841 xfs_dqlock(dqp);
842 dqp->dq_flags &= ~(XFS_DQ_WANT);
843 }
844 flist_locked = B_TRUE;
845 }
846
847 /*
848 * id couldn't have changed; we had the hashlock all
849 * along
850 */
851 ASSERT(be32_to_cpu(dqp->q_core.d_id) == id);
852
853 if (flist_locked) {
854 if (dqp->q_nrefs != 0) {
855 xfs_qm_freelist_unlock(xfs_Gqm);
856 flist_locked = B_FALSE;
857 } else {
858 /*
859 * take it off the freelist
860 */
861 xfs_dqtrace_entry(dqp,
862 "DQLOOKUP: TAKEOFF FL");
863 XQM_FREELIST_REMOVE(dqp);
864 /* xfs_qm_freelist_print(&(xfs_Gqm->
865 qm_dqfreelist),
866 "after removal"); */
867 }
868 }
869
870 /*
871 * grab a reference
872 */
873 XFS_DQHOLD(dqp);
874
875 if (flist_locked)
876 xfs_qm_freelist_unlock(xfs_Gqm);
877 /*
878 * move the dquot to the front of the hashchain
879 */
880 ASSERT(XFS_DQ_IS_HASH_LOCKED(qh));
881 if (dqp->HL_PREVP != &qh->qh_next) {
882 xfs_dqtrace_entry(dqp,
883 "DQLOOKUP: HASH MOVETOFRONT");
884 if ((d = dqp->HL_NEXT))
885 d->HL_PREVP = dqp->HL_PREVP;
886 *(dqp->HL_PREVP) = d;
887 d = qh->qh_next;
888 d->HL_PREVP = &dqp->HL_NEXT;
889 dqp->HL_NEXT = d;
890 dqp->HL_PREVP = &qh->qh_next;
891 qh->qh_next = dqp;
892 }
893 xfs_dqtrace_entry(dqp, "LOOKUP END");
894 *O_dqpp = dqp;
895 ASSERT(XFS_DQ_IS_HASH_LOCKED(qh));
896 return (0);
897 }
898 }
899
900 *O_dqpp = NULL;
901 ASSERT(XFS_DQ_IS_HASH_LOCKED(qh));
902 return (1);
903 }
904
905 /*
906 * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a
907 * a locked dquot, doing an allocation (if requested) as needed.
908 * When both an inode and an id are given, the inode's id takes precedence.
909 * That is, if the id changes while we don't hold the ilock inside this
910 * function, the new dquot is returned, not necessarily the one requested
911 * in the id argument.
912 */
913 int
xfs_qm_dqget(xfs_mount_t * mp,xfs_inode_t * ip,xfs_dqid_t id,uint type,uint flags,xfs_dquot_t ** O_dqpp)914 xfs_qm_dqget(
915 xfs_mount_t *mp,
916 xfs_inode_t *ip, /* locked inode (optional) */
917 xfs_dqid_t id, /* uid/projid/gid depending on type */
918 uint type, /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */
919 uint flags, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
920 xfs_dquot_t **O_dqpp) /* OUT : locked incore dquot */
921 {
922 xfs_dquot_t *dqp;
923 xfs_dqhash_t *h;
924 uint version;
925 int error;
926
927 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
928 if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) ||
929 (! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) ||
930 (! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) {
931 return (ESRCH);
932 }
933 h = XFS_DQ_HASH(mp, id, type);
934
935 #ifdef DEBUG
936 if (xfs_do_dqerror) {
937 if ((xfs_dqerror_target == mp->m_ddev_targp) &&
938 (xfs_dqreq_num++ % xfs_dqerror_mod) == 0) {
939 cmn_err(CE_DEBUG, "Returning error in dqget");
940 return (EIO);
941 }
942 }
943 #endif
944
945 again:
946
947 #ifdef DEBUG
948 ASSERT(type == XFS_DQ_USER ||
949 type == XFS_DQ_PROJ ||
950 type == XFS_DQ_GROUP);
951 if (ip) {
952 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
953 if (type == XFS_DQ_USER)
954 ASSERT(ip->i_udquot == NULL);
955 else
956 ASSERT(ip->i_gdquot == NULL);
957 }
958 #endif
959 XFS_DQ_HASH_LOCK(h);
960
961 /*
962 * Look in the cache (hashtable).
963 * The chain is kept locked during lookup.
964 */
965 if (xfs_qm_dqlookup(mp, id, h, O_dqpp) == 0) {
966 XQM_STATS_INC(xqmstats.xs_qm_dqcachehits);
967 /*
968 * The dquot was found, moved to the front of the chain,
969 * taken off the freelist if it was on it, and locked
970 * at this point. Just unlock the hashchain and return.
971 */
972 ASSERT(*O_dqpp);
973 ASSERT(XFS_DQ_IS_LOCKED(*O_dqpp));
974 XFS_DQ_HASH_UNLOCK(h);
975 xfs_dqtrace_entry(*O_dqpp, "DQGET DONE (FROM CACHE)");
976 return (0); /* success */
977 }
978 XQM_STATS_INC(xqmstats.xs_qm_dqcachemisses);
979
980 /*
981 * Dquot cache miss. We don't want to keep the inode lock across
982 * a (potential) disk read. Also we don't want to deal with the lock
983 * ordering between quotainode and this inode. OTOH, dropping the inode
984 * lock here means dealing with a chown that can happen before
985 * we re-acquire the lock.
986 */
987 if (ip)
988 xfs_iunlock(ip, XFS_ILOCK_EXCL);
989 /*
990 * Save the hashchain version stamp, and unlock the chain, so that
991 * we don't keep the lock across a disk read
992 */
993 version = h->qh_version;
994 XFS_DQ_HASH_UNLOCK(h);
995
996 /*
997 * Allocate the dquot on the kernel heap, and read the ondisk
998 * portion off the disk. Also, do all the necessary initialization
999 * This can return ENOENT if dquot didn't exist on disk and we didn't
1000 * ask it to allocate; ESRCH if quotas got turned off suddenly.
1001 */
1002 if ((error = xfs_qm_idtodq(mp, id, type,
1003 flags & (XFS_QMOPT_DQALLOC|XFS_QMOPT_DQREPAIR|
1004 XFS_QMOPT_DOWARN),
1005 &dqp))) {
1006 if (ip)
1007 xfs_ilock(ip, XFS_ILOCK_EXCL);
1008 return (error);
1009 }
1010
1011 /*
1012 * See if this is mount code calling to look at the overall quota limits
1013 * which are stored in the id == 0 user or group's dquot.
1014 * Since we may not have done a quotacheck by this point, just return
1015 * the dquot without attaching it to any hashtables, lists, etc, or even
1016 * taking a reference.
1017 * The caller must dqdestroy this once done.
1018 */
1019 if (flags & XFS_QMOPT_DQSUSER) {
1020 ASSERT(id == 0);
1021 ASSERT(! ip);
1022 goto dqret;
1023 }
1024
1025 /*
1026 * Dquot lock comes after hashlock in the lock ordering
1027 */
1028 if (ip) {
1029 xfs_ilock(ip, XFS_ILOCK_EXCL);
1030 if (! XFS_IS_DQTYPE_ON(mp, type)) {
1031 /* inode stays locked on return */
1032 xfs_qm_dqdestroy(dqp);
1033 return XFS_ERROR(ESRCH);
1034 }
1035 /*
1036 * A dquot could be attached to this inode by now, since
1037 * we had dropped the ilock.
1038 */
1039 if (type == XFS_DQ_USER) {
1040 if (ip->i_udquot) {
1041 xfs_qm_dqdestroy(dqp);
1042 dqp = ip->i_udquot;
1043 xfs_dqlock(dqp);
1044 goto dqret;
1045 }
1046 } else {
1047 if (ip->i_gdquot) {
1048 xfs_qm_dqdestroy(dqp);
1049 dqp = ip->i_gdquot;
1050 xfs_dqlock(dqp);
1051 goto dqret;
1052 }
1053 }
1054 }
1055
1056 /*
1057 * Hashlock comes after ilock in lock order
1058 */
1059 XFS_DQ_HASH_LOCK(h);
1060 if (version != h->qh_version) {
1061 xfs_dquot_t *tmpdqp;
1062 /*
1063 * Now, see if somebody else put the dquot in the
1064 * hashtable before us. This can happen because we didn't
1065 * keep the hashchain lock. We don't have to worry about
1066 * lock order between the two dquots here since dqp isn't
1067 * on any findable lists yet.
1068 */
1069 if (xfs_qm_dqlookup(mp, id, h, &tmpdqp) == 0) {
1070 /*
1071 * Duplicate found. Just throw away the new dquot
1072 * and start over.
1073 */
1074 xfs_qm_dqput(tmpdqp);
1075 XFS_DQ_HASH_UNLOCK(h);
1076 xfs_qm_dqdestroy(dqp);
1077 XQM_STATS_INC(xqmstats.xs_qm_dquot_dups);
1078 goto again;
1079 }
1080 }
1081
1082 /*
1083 * Put the dquot at the beginning of the hash-chain and mp's list
1084 * LOCK ORDER: hashlock, freelistlock, mplistlock, udqlock, gdqlock ..
1085 */
1086 ASSERT(XFS_DQ_IS_HASH_LOCKED(h));
1087 dqp->q_hash = h;
1088 XQM_HASHLIST_INSERT(h, dqp);
1089
1090 /*
1091 * Attach this dquot to this filesystem's list of all dquots,
1092 * kept inside the mount structure in m_quotainfo field
1093 */
1094 xfs_qm_mplist_lock(mp);
1095
1096 /*
1097 * We return a locked dquot to the caller, with a reference taken
1098 */
1099 xfs_dqlock(dqp);
1100 dqp->q_nrefs = 1;
1101
1102 XQM_MPLIST_INSERT(&(XFS_QI_MPL_LIST(mp)), dqp);
1103
1104 xfs_qm_mplist_unlock(mp);
1105 XFS_DQ_HASH_UNLOCK(h);
1106 dqret:
1107 ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL));
1108 xfs_dqtrace_entry(dqp, "DQGET DONE");
1109 *O_dqpp = dqp;
1110 return (0);
1111 }
1112
1113
1114 /*
1115 * Release a reference to the dquot (decrement ref-count)
1116 * and unlock it. If there is a group quota attached to this
1117 * dquot, carefully release that too without tripping over
1118 * deadlocks'n'stuff.
1119 */
1120 void
xfs_qm_dqput(xfs_dquot_t * dqp)1121 xfs_qm_dqput(
1122 xfs_dquot_t *dqp)
1123 {
1124 xfs_dquot_t *gdqp;
1125
1126 ASSERT(dqp->q_nrefs > 0);
1127 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1128 xfs_dqtrace_entry(dqp, "DQPUT");
1129
1130 if (dqp->q_nrefs != 1) {
1131 dqp->q_nrefs--;
1132 xfs_dqunlock(dqp);
1133 return;
1134 }
1135
1136 /*
1137 * drop the dqlock and acquire the freelist and dqlock
1138 * in the right order; but try to get it out-of-order first
1139 */
1140 if (! xfs_qm_freelist_lock_nowait(xfs_Gqm)) {
1141 xfs_dqtrace_entry(dqp, "DQPUT: FLLOCK-WAIT");
1142 xfs_dqunlock(dqp);
1143 xfs_qm_freelist_lock(xfs_Gqm);
1144 xfs_dqlock(dqp);
1145 }
1146
1147 while (1) {
1148 gdqp = NULL;
1149
1150 /* We can't depend on nrefs being == 1 here */
1151 if (--dqp->q_nrefs == 0) {
1152 xfs_dqtrace_entry(dqp, "DQPUT: ON FREELIST");
1153 /*
1154 * insert at end of the freelist.
1155 */
1156 XQM_FREELIST_INSERT(&(xfs_Gqm->qm_dqfreelist), dqp);
1157
1158 /*
1159 * If we just added a udquot to the freelist, then
1160 * we want to release the gdquot reference that
1161 * it (probably) has. Otherwise it'll keep the
1162 * gdquot from getting reclaimed.
1163 */
1164 if ((gdqp = dqp->q_gdquot)) {
1165 /*
1166 * Avoid a recursive dqput call
1167 */
1168 xfs_dqlock(gdqp);
1169 dqp->q_gdquot = NULL;
1170 }
1171
1172 /* xfs_qm_freelist_print(&(xfs_Gqm->qm_dqfreelist),
1173 "@@@@@++ Free list (after append) @@@@@+");
1174 */
1175 }
1176 xfs_dqunlock(dqp);
1177
1178 /*
1179 * If we had a group quota inside the user quota as a hint,
1180 * release it now.
1181 */
1182 if (! gdqp)
1183 break;
1184 dqp = gdqp;
1185 }
1186 xfs_qm_freelist_unlock(xfs_Gqm);
1187 }
1188
1189 /*
1190 * Release a dquot. Flush it if dirty, then dqput() it.
1191 * dquot must not be locked.
1192 */
1193 void
xfs_qm_dqrele(xfs_dquot_t * dqp)1194 xfs_qm_dqrele(
1195 xfs_dquot_t *dqp)
1196 {
1197 ASSERT(dqp);
1198 xfs_dqtrace_entry(dqp, "DQRELE");
1199
1200 xfs_dqlock(dqp);
1201 /*
1202 * We don't care to flush it if the dquot is dirty here.
1203 * That will create stutters that we want to avoid.
1204 * Instead we do a delayed write when we try to reclaim
1205 * a dirty dquot. Also xfs_sync will take part of the burden...
1206 */
1207 xfs_qm_dqput(dqp);
1208 }
1209
1210
1211 /*
1212 * Write a modified dquot to disk.
1213 * The dquot must be locked and the flush lock too taken by caller.
1214 * The flush lock will not be unlocked until the dquot reaches the disk,
1215 * but the dquot is free to be unlocked and modified by the caller
1216 * in the interim. Dquot is still locked on return. This behavior is
1217 * identical to that of inodes.
1218 */
1219 int
xfs_qm_dqflush(xfs_dquot_t * dqp,uint flags)1220 xfs_qm_dqflush(
1221 xfs_dquot_t *dqp,
1222 uint flags)
1223 {
1224 xfs_mount_t *mp;
1225 xfs_buf_t *bp;
1226 xfs_disk_dquot_t *ddqp;
1227 int error;
1228
1229 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1230 ASSERT(!completion_done(&dqp->q_flush));
1231 xfs_dqtrace_entry(dqp, "DQFLUSH");
1232
1233 /*
1234 * If not dirty, or it's pinned and we are not supposed to
1235 * block, nada.
1236 */
1237 if (!XFS_DQ_IS_DIRTY(dqp) ||
1238 (!(flags & XFS_QMOPT_SYNC) && atomic_read(&dqp->q_pincount) > 0)) {
1239 xfs_dqfunlock(dqp);
1240 return 0;
1241 }
1242 xfs_qm_dqunpin_wait(dqp);
1243
1244 /*
1245 * This may have been unpinned because the filesystem is shutting
1246 * down forcibly. If that's the case we must not write this dquot
1247 * to disk, because the log record didn't make it to disk!
1248 */
1249 if (XFS_FORCED_SHUTDOWN(dqp->q_mount)) {
1250 dqp->dq_flags &= ~(XFS_DQ_DIRTY);
1251 xfs_dqfunlock(dqp);
1252 return XFS_ERROR(EIO);
1253 }
1254
1255 /*
1256 * Get the buffer containing the on-disk dquot
1257 * We don't need a transaction envelope because we know that the
1258 * the ondisk-dquot has already been allocated for.
1259 */
1260 if ((error = xfs_qm_dqtobp(NULL, dqp, &ddqp, &bp, XFS_QMOPT_DOWARN))) {
1261 xfs_dqtrace_entry(dqp, "DQTOBP FAIL");
1262 ASSERT(error != ENOENT);
1263 /*
1264 * Quotas could have gotten turned off (ESRCH)
1265 */
1266 xfs_dqfunlock(dqp);
1267 return (error);
1268 }
1269
1270 if (xfs_qm_dqcheck(&dqp->q_core, be32_to_cpu(ddqp->d_id),
1271 0, XFS_QMOPT_DOWARN, "dqflush (incore copy)")) {
1272 xfs_force_shutdown(dqp->q_mount, SHUTDOWN_CORRUPT_INCORE);
1273 return XFS_ERROR(EIO);
1274 }
1275
1276 /* This is the only portion of data that needs to persist */
1277 memcpy(ddqp, &(dqp->q_core), sizeof(xfs_disk_dquot_t));
1278
1279 /*
1280 * Clear the dirty field and remember the flush lsn for later use.
1281 */
1282 dqp->dq_flags &= ~(XFS_DQ_DIRTY);
1283 mp = dqp->q_mount;
1284
1285 xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn,
1286 &dqp->q_logitem.qli_item.li_lsn);
1287
1288 /*
1289 * Attach an iodone routine so that we can remove this dquot from the
1290 * AIL and release the flush lock once the dquot is synced to disk.
1291 */
1292 xfs_buf_attach_iodone(bp, (void(*)(xfs_buf_t *, xfs_log_item_t *))
1293 xfs_qm_dqflush_done, &(dqp->q_logitem.qli_item));
1294 /*
1295 * If the buffer is pinned then push on the log so we won't
1296 * get stuck waiting in the write for too long.
1297 */
1298 if (XFS_BUF_ISPINNED(bp)) {
1299 xfs_dqtrace_entry(dqp, "DQFLUSH LOG FORCE");
1300 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
1301 }
1302
1303 if (flags & XFS_QMOPT_DELWRI) {
1304 xfs_bdwrite(mp, bp);
1305 } else if (flags & XFS_QMOPT_ASYNC) {
1306 error = xfs_bawrite(mp, bp);
1307 } else {
1308 error = xfs_bwrite(mp, bp);
1309 }
1310 xfs_dqtrace_entry(dqp, "DQFLUSH END");
1311 /*
1312 * dqp is still locked, but caller is free to unlock it now.
1313 */
1314 return (error);
1315
1316 }
1317
1318 /*
1319 * This is the dquot flushing I/O completion routine. It is called
1320 * from interrupt level when the buffer containing the dquot is
1321 * flushed to disk. It is responsible for removing the dquot logitem
1322 * from the AIL if it has not been re-logged, and unlocking the dquot's
1323 * flush lock. This behavior is very similar to that of inodes..
1324 */
1325 /*ARGSUSED*/
1326 STATIC void
xfs_qm_dqflush_done(xfs_buf_t * bp,xfs_dq_logitem_t * qip)1327 xfs_qm_dqflush_done(
1328 xfs_buf_t *bp,
1329 xfs_dq_logitem_t *qip)
1330 {
1331 xfs_dquot_t *dqp;
1332 struct xfs_ail *ailp;
1333
1334 dqp = qip->qli_dquot;
1335 ailp = qip->qli_item.li_ailp;
1336
1337 /*
1338 * We only want to pull the item from the AIL if its
1339 * location in the log has not changed since we started the flush.
1340 * Thus, we only bother if the dquot's lsn has
1341 * not changed. First we check the lsn outside the lock
1342 * since it's cheaper, and then we recheck while
1343 * holding the lock before removing the dquot from the AIL.
1344 */
1345 if ((qip->qli_item.li_flags & XFS_LI_IN_AIL) &&
1346 qip->qli_item.li_lsn == qip->qli_flush_lsn) {
1347
1348 /* xfs_trans_ail_delete() drops the AIL lock. */
1349 spin_lock(&ailp->xa_lock);
1350 if (qip->qli_item.li_lsn == qip->qli_flush_lsn)
1351 xfs_trans_ail_delete(ailp, (xfs_log_item_t*)qip);
1352 else
1353 spin_unlock(&ailp->xa_lock);
1354 }
1355
1356 /*
1357 * Release the dq's flush lock since we're done with it.
1358 */
1359 xfs_dqfunlock(dqp);
1360 }
1361
1362 int
xfs_qm_dqlock_nowait(xfs_dquot_t * dqp)1363 xfs_qm_dqlock_nowait(
1364 xfs_dquot_t *dqp)
1365 {
1366 return mutex_trylock(&dqp->q_qlock);
1367 }
1368
1369 void
xfs_dqlock(xfs_dquot_t * dqp)1370 xfs_dqlock(
1371 xfs_dquot_t *dqp)
1372 {
1373 mutex_lock(&dqp->q_qlock);
1374 }
1375
1376 void
xfs_dqunlock(xfs_dquot_t * dqp)1377 xfs_dqunlock(
1378 xfs_dquot_t *dqp)
1379 {
1380 mutex_unlock(&(dqp->q_qlock));
1381 if (dqp->q_logitem.qli_dquot == dqp) {
1382 /* Once was dqp->q_mount, but might just have been cleared */
1383 xfs_trans_unlocked_item(dqp->q_logitem.qli_item.li_ailp,
1384 (xfs_log_item_t*)&(dqp->q_logitem));
1385 }
1386 }
1387
1388
1389 void
xfs_dqunlock_nonotify(xfs_dquot_t * dqp)1390 xfs_dqunlock_nonotify(
1391 xfs_dquot_t *dqp)
1392 {
1393 mutex_unlock(&(dqp->q_qlock));
1394 }
1395
1396 /*
1397 * Lock two xfs_dquot structures.
1398 *
1399 * To avoid deadlocks we always lock the quota structure with
1400 * the lowerd id first.
1401 */
1402 void
xfs_dqlock2(xfs_dquot_t * d1,xfs_dquot_t * d2)1403 xfs_dqlock2(
1404 xfs_dquot_t *d1,
1405 xfs_dquot_t *d2)
1406 {
1407 if (d1 && d2) {
1408 ASSERT(d1 != d2);
1409 if (be32_to_cpu(d1->q_core.d_id) >
1410 be32_to_cpu(d2->q_core.d_id)) {
1411 mutex_lock(&d2->q_qlock);
1412 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
1413 } else {
1414 mutex_lock(&d1->q_qlock);
1415 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
1416 }
1417 } else if (d1) {
1418 mutex_lock(&d1->q_qlock);
1419 } else if (d2) {
1420 mutex_lock(&d2->q_qlock);
1421 }
1422 }
1423
1424
1425 /*
1426 * Take a dquot out of the mount's dqlist as well as the hashlist.
1427 * This is called via unmount as well as quotaoff, and the purge
1428 * will always succeed unless there are soft (temp) references
1429 * outstanding.
1430 *
1431 * This returns 0 if it was purged, 1 if it wasn't. It's not an error code
1432 * that we're returning! XXXsup - not cool.
1433 */
1434 /* ARGSUSED */
1435 int
xfs_qm_dqpurge(xfs_dquot_t * dqp)1436 xfs_qm_dqpurge(
1437 xfs_dquot_t *dqp)
1438 {
1439 xfs_dqhash_t *thishash;
1440 xfs_mount_t *mp = dqp->q_mount;
1441
1442 ASSERT(XFS_QM_IS_MPLIST_LOCKED(mp));
1443 ASSERT(XFS_DQ_IS_HASH_LOCKED(dqp->q_hash));
1444
1445 xfs_dqlock(dqp);
1446 /*
1447 * We really can't afford to purge a dquot that is
1448 * referenced, because these are hard refs.
1449 * It shouldn't happen in general because we went thru _all_ inodes in
1450 * dqrele_all_inodes before calling this and didn't let the mountlock go.
1451 * However it is possible that we have dquots with temporary
1452 * references that are not attached to an inode. e.g. see xfs_setattr().
1453 */
1454 if (dqp->q_nrefs != 0) {
1455 xfs_dqunlock(dqp);
1456 XFS_DQ_HASH_UNLOCK(dqp->q_hash);
1457 return (1);
1458 }
1459
1460 ASSERT(XFS_DQ_IS_ON_FREELIST(dqp));
1461
1462 /*
1463 * If we're turning off quotas, we have to make sure that, for
1464 * example, we don't delete quota disk blocks while dquots are
1465 * in the process of getting written to those disk blocks.
1466 * This dquot might well be on AIL, and we can't leave it there
1467 * if we're turning off quotas. Basically, we need this flush
1468 * lock, and are willing to block on it.
1469 */
1470 if (!xfs_dqflock_nowait(dqp)) {
1471 /*
1472 * Block on the flush lock after nudging dquot buffer,
1473 * if it is incore.
1474 */
1475 xfs_qm_dqflock_pushbuf_wait(dqp);
1476 }
1477
1478 /*
1479 * XXXIf we're turning this type of quotas off, we don't care
1480 * about the dirty metadata sitting in this dquot. OTOH, if
1481 * we're unmounting, we do care, so we flush it and wait.
1482 */
1483 if (XFS_DQ_IS_DIRTY(dqp)) {
1484 int error;
1485 xfs_dqtrace_entry(dqp, "DQPURGE ->DQFLUSH: DQDIRTY");
1486 /* dqflush unlocks dqflock */
1487 /*
1488 * Given that dqpurge is a very rare occurrence, it is OK
1489 * that we're holding the hashlist and mplist locks
1490 * across the disk write. But, ... XXXsup
1491 *
1492 * We don't care about getting disk errors here. We need
1493 * to purge this dquot anyway, so we go ahead regardless.
1494 */
1495 error = xfs_qm_dqflush(dqp, XFS_QMOPT_SYNC);
1496 if (error)
1497 xfs_fs_cmn_err(CE_WARN, mp,
1498 "xfs_qm_dqpurge: dquot %p flush failed", dqp);
1499 xfs_dqflock(dqp);
1500 }
1501 ASSERT(atomic_read(&dqp->q_pincount) == 0);
1502 ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1503 !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
1504
1505 thishash = dqp->q_hash;
1506 XQM_HASHLIST_REMOVE(thishash, dqp);
1507 XQM_MPLIST_REMOVE(&(XFS_QI_MPL_LIST(mp)), dqp);
1508 /*
1509 * XXX Move this to the front of the freelist, if we can get the
1510 * freelist lock.
1511 */
1512 ASSERT(XFS_DQ_IS_ON_FREELIST(dqp));
1513
1514 dqp->q_mount = NULL;
1515 dqp->q_hash = NULL;
1516 dqp->dq_flags = XFS_DQ_INACTIVE;
1517 memset(&dqp->q_core, 0, sizeof(dqp->q_core));
1518 xfs_dqfunlock(dqp);
1519 xfs_dqunlock(dqp);
1520 XFS_DQ_HASH_UNLOCK(thishash);
1521 return (0);
1522 }
1523
1524
1525 #ifdef QUOTADEBUG
1526 void
xfs_qm_dqprint(xfs_dquot_t * dqp)1527 xfs_qm_dqprint(xfs_dquot_t *dqp)
1528 {
1529 cmn_err(CE_DEBUG, "-----------KERNEL DQUOT----------------");
1530 cmn_err(CE_DEBUG, "---- dquotID = %d",
1531 (int)be32_to_cpu(dqp->q_core.d_id));
1532 cmn_err(CE_DEBUG, "---- type = %s", DQFLAGTO_TYPESTR(dqp));
1533 cmn_err(CE_DEBUG, "---- fs = 0x%p", dqp->q_mount);
1534 cmn_err(CE_DEBUG, "---- blkno = 0x%x", (int) dqp->q_blkno);
1535 cmn_err(CE_DEBUG, "---- boffset = 0x%x", (int) dqp->q_bufoffset);
1536 cmn_err(CE_DEBUG, "---- blkhlimit = %Lu (0x%x)",
1537 be64_to_cpu(dqp->q_core.d_blk_hardlimit),
1538 (int)be64_to_cpu(dqp->q_core.d_blk_hardlimit));
1539 cmn_err(CE_DEBUG, "---- blkslimit = %Lu (0x%x)",
1540 be64_to_cpu(dqp->q_core.d_blk_softlimit),
1541 (int)be64_to_cpu(dqp->q_core.d_blk_softlimit));
1542 cmn_err(CE_DEBUG, "---- inohlimit = %Lu (0x%x)",
1543 be64_to_cpu(dqp->q_core.d_ino_hardlimit),
1544 (int)be64_to_cpu(dqp->q_core.d_ino_hardlimit));
1545 cmn_err(CE_DEBUG, "---- inoslimit = %Lu (0x%x)",
1546 be64_to_cpu(dqp->q_core.d_ino_softlimit),
1547 (int)be64_to_cpu(dqp->q_core.d_ino_softlimit));
1548 cmn_err(CE_DEBUG, "---- bcount = %Lu (0x%x)",
1549 be64_to_cpu(dqp->q_core.d_bcount),
1550 (int)be64_to_cpu(dqp->q_core.d_bcount));
1551 cmn_err(CE_DEBUG, "---- icount = %Lu (0x%x)",
1552 be64_to_cpu(dqp->q_core.d_icount),
1553 (int)be64_to_cpu(dqp->q_core.d_icount));
1554 cmn_err(CE_DEBUG, "---- btimer = %d",
1555 (int)be32_to_cpu(dqp->q_core.d_btimer));
1556 cmn_err(CE_DEBUG, "---- itimer = %d",
1557 (int)be32_to_cpu(dqp->q_core.d_itimer));
1558 cmn_err(CE_DEBUG, "---------------------------");
1559 }
1560 #endif
1561
1562 /*
1563 * Give the buffer a little push if it is incore and
1564 * wait on the flush lock.
1565 */
1566 void
xfs_qm_dqflock_pushbuf_wait(xfs_dquot_t * dqp)1567 xfs_qm_dqflock_pushbuf_wait(
1568 xfs_dquot_t *dqp)
1569 {
1570 xfs_buf_t *bp;
1571
1572 /*
1573 * Check to see if the dquot has been flushed delayed
1574 * write. If so, grab its buffer and send it
1575 * out immediately. We'll be able to acquire
1576 * the flush lock when the I/O completes.
1577 */
1578 bp = xfs_incore(dqp->q_mount->m_ddev_targp, dqp->q_blkno,
1579 XFS_QI_DQCHUNKLEN(dqp->q_mount),
1580 XFS_INCORE_TRYLOCK);
1581 if (bp != NULL) {
1582 if (XFS_BUF_ISDELAYWRITE(bp)) {
1583 int error;
1584 if (XFS_BUF_ISPINNED(bp)) {
1585 xfs_log_force(dqp->q_mount,
1586 (xfs_lsn_t)0,
1587 XFS_LOG_FORCE);
1588 }
1589 error = xfs_bawrite(dqp->q_mount, bp);
1590 if (error)
1591 xfs_fs_cmn_err(CE_WARN, dqp->q_mount,
1592 "xfs_qm_dqflock_pushbuf_wait: "
1593 "pushbuf error %d on dqp %p, bp %p",
1594 error, dqp, bp);
1595 } else {
1596 xfs_buf_relse(bp);
1597 }
1598 }
1599 xfs_dqflock(dqp);
1600 }
1601