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