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
42 struct kmem_cache *xfs_dqtrx_cache;
43 static struct kmem_cache *xfs_dquot_cache;
44
45 static struct lock_class_key xfs_dquot_group_class;
46 static struct lock_class_key xfs_dquot_project_class;
47
48 /* Record observations of quota corruption with the health tracking system. */
49 static void
xfs_dquot_mark_sick(struct xfs_dquot * dqp)50 xfs_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 */
76 void
xfs_dquot_detach_buf(struct xfs_dquot * dqp)77 xfs_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 */
99 void
xfs_qm_dqdestroy(struct xfs_dquot * dqp)100 xfs_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 */
118 void
xfs_qm_adjust_dqlimits(struct xfs_dquot * dq)119 xfs_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. */
152 time64_t
xfs_dquot_set_timeout(struct xfs_mount * mp,time64_t timeout)153 xfs_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. */
164 time64_t
xfs_dquot_set_grace_period(time64_t grace)165 xfs_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 */
175 static inline void
xfs_qm_adjust_res_timer(struct xfs_mount * mp,struct xfs_dquot_res * res,struct xfs_quota_limits * qlim)176 xfs_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 */
206 void
xfs_qm_adjust_dqtimers(struct xfs_dquot * dq)207 xfs_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 */
225 void
xfs_qm_init_dquot_blk(struct xfs_trans * tp,xfs_dqid_t id,xfs_dqtype_t type,struct xfs_buf * bp)226 xfs_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
306 static void
xfs_dquot_set_prealloc(struct xfs_dquot_pre * pre,const struct xfs_dquot_res * res)307 xfs_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 */
330 void
xfs_dquot_set_prealloc_limits(struct xfs_dquot * dqp)331 xfs_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 */
342 STATIC int
xfs_dquot_disk_alloc(struct xfs_dquot * dqp,struct xfs_buf ** bpp)343 xfs_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
445 err_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 */
455 STATIC int
xfs_dquot_disk_read(struct xfs_mount * mp,struct xfs_dquot * dqp,struct xfs_buf ** bpp)456 xfs_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. */
520 STATIC struct xfs_dquot *
xfs_dquot_alloc(struct xfs_mount * mp,xfs_dqid_t id,xfs_dqtype_t type)521 xfs_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. */
577 static bool
xfs_dquot_check_type(struct xfs_dquot * dqp,struct xfs_disk_dquot * ddqp)578 xfs_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. */
613 STATIC int
xfs_dquot_from_disk(struct xfs_dquot * dqp,struct xfs_buf * bp)614 xfs_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. */
665 void
xfs_dquot_to_disk(struct xfs_disk_dquot * ddqp,struct xfs_dquot * dqp)666 xfs_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 */
702 static int
xfs_qm_dqread(struct xfs_mount * mp,xfs_dqid_t id,xfs_dqtype_t type,bool can_alloc,struct xfs_dquot ** dqpp)703 xfs_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
739 err:
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 */
751 static int
xfs_dq_get_next_id(struct xfs_mount * mp,xfs_dqtype_t type,xfs_dqid_t * id)752 xfs_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 */
801 static struct xfs_dquot *
xfs_qm_dqget_cache_lookup(struct xfs_mount * mp,struct xfs_quotainfo * qi,struct radix_tree_root * tree,xfs_dqid_t id)802 xfs_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
810 restart:
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 */
848 static int
xfs_qm_dqget_cache_insert(struct xfs_mount * mp,struct xfs_quotainfo * qi,struct radix_tree_root * tree,xfs_dqid_t id,struct xfs_dquot * dqp)849 xfs_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
873 out_unlock:
874 mutex_unlock(&qi->qi_tree_lock);
875 memalloc_nofs_restore(nofs_flags);
876 return error;
877 }
878
879 /* Check our input parameters. */
880 static int
xfs_qm_dqget_checks(struct xfs_mount * mp,xfs_dqtype_t type)881 xfs_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 */
908 int
xfs_qm_dqget(struct xfs_mount * mp,xfs_dqid_t id,xfs_dqtype_t type,bool can_alloc,struct xfs_dquot ** O_dqpp)909 xfs_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
925 restart:
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 */
958 int
xfs_qm_dqget_uncached(struct xfs_mount * mp,xfs_dqid_t id,xfs_dqtype_t type,struct xfs_dquot ** dqpp)959 xfs_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. */
975 xfs_dqid_t
xfs_qm_id_for_quotatype(struct xfs_inode * ip,xfs_dqtype_t type)976 xfs_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 */
997 int
xfs_qm_dqget_inode(struct xfs_inode * ip,xfs_dqtype_t type,bool can_alloc,struct xfs_dquot ** O_dqpp)998 xfs_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
1021 restart:
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
1072 dqret:
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 */
1083 int
xfs_qm_dqget_next(struct xfs_mount * mp,xfs_dqid_t id,xfs_dqtype_t type,struct xfs_dquot ** dqpp)1084 xfs_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 */
1118 void
xfs_qm_dqput(struct xfs_dquot * dqp)1119 xfs_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 */
1141 void
xfs_qm_dqrele(struct xfs_dquot * dqp)1142 xfs_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 */
1167 static void
xfs_qm_dqflush_done(struct xfs_log_item * lip)1168 xfs_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
1221 void
xfs_buf_dquot_iodone(struct xfs_buf * bp)1222 xfs_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
1233 /* Check incore dquot for errors before we flush. */
1234 static xfs_failaddr_t
xfs_qm_dqflush_check(struct xfs_dquot * dqp)1235 xfs_qm_dqflush_check(
1236 struct xfs_dquot *dqp)
1237 {
1238 xfs_dqtype_t type = xfs_dquot_type(dqp);
1239
1240 if (type != XFS_DQTYPE_USER &&
1241 type != XFS_DQTYPE_GROUP &&
1242 type != XFS_DQTYPE_PROJ)
1243 return __this_address;
1244
1245 if (dqp->q_id == 0)
1246 return NULL;
1247
1248 if (dqp->q_blk.softlimit && dqp->q_blk.count > dqp->q_blk.softlimit &&
1249 !dqp->q_blk.timer)
1250 return __this_address;
1251
1252 if (dqp->q_ino.softlimit && dqp->q_ino.count > dqp->q_ino.softlimit &&
1253 !dqp->q_ino.timer)
1254 return __this_address;
1255
1256 if (dqp->q_rtb.softlimit && dqp->q_rtb.count > dqp->q_rtb.softlimit &&
1257 !dqp->q_rtb.timer)
1258 return __this_address;
1259
1260 /* bigtime flag should never be set on root dquots */
1261 if (dqp->q_type & XFS_DQTYPE_BIGTIME) {
1262 if (!xfs_has_bigtime(dqp->q_mount))
1263 return __this_address;
1264 if (dqp->q_id == 0)
1265 return __this_address;
1266 }
1267
1268 return NULL;
1269 }
1270
1271 /*
1272 * Get the buffer containing the on-disk dquot.
1273 *
1274 * Requires dquot flush lock, will clear the dirty flag, delete the quota log
1275 * item from the AIL, and shut down the system if something goes wrong.
1276 */
1277 static int
xfs_dquot_read_buf(struct xfs_trans * tp,struct xfs_dquot * dqp,struct xfs_buf ** bpp)1278 xfs_dquot_read_buf(
1279 struct xfs_trans *tp,
1280 struct xfs_dquot *dqp,
1281 struct xfs_buf **bpp)
1282 {
1283 struct xfs_mount *mp = dqp->q_mount;
1284 struct xfs_buf *bp = NULL;
1285 int error;
1286
1287 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, dqp->q_blkno,
1288 mp->m_quotainfo->qi_dqchunklen, 0,
1289 &bp, &xfs_dquot_buf_ops);
1290 if (xfs_metadata_is_sick(error))
1291 xfs_dquot_mark_sick(dqp);
1292 if (error)
1293 goto out_abort;
1294
1295 *bpp = bp;
1296 return 0;
1297
1298 out_abort:
1299 dqp->q_flags &= ~XFS_DQFLAG_DIRTY;
1300 xfs_trans_ail_delete(&dqp->q_logitem.qli_item, 0);
1301 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1302 return error;
1303 }
1304
1305 /*
1306 * Attach a dquot buffer to this dquot to avoid allocating a buffer during a
1307 * dqflush, since dqflush can be called from reclaim context. Caller must hold
1308 * the dqlock.
1309 */
1310 int
xfs_dquot_attach_buf(struct xfs_trans * tp,struct xfs_dquot * dqp)1311 xfs_dquot_attach_buf(
1312 struct xfs_trans *tp,
1313 struct xfs_dquot *dqp)
1314 {
1315 struct xfs_dq_logitem *qlip = &dqp->q_logitem;
1316 struct xfs_log_item *lip = &qlip->qli_item;
1317 int error;
1318
1319 spin_lock(&qlip->qli_lock);
1320 if (!lip->li_buf) {
1321 struct xfs_buf *bp = NULL;
1322
1323 spin_unlock(&qlip->qli_lock);
1324 error = xfs_dquot_read_buf(tp, dqp, &bp);
1325 if (error)
1326 return error;
1327
1328 /*
1329 * Hold the dquot buffer so that we retain our ref to it after
1330 * detaching it from the transaction, then give that ref to the
1331 * dquot log item so that the AIL does not have to read the
1332 * dquot buffer to push this item.
1333 */
1334 xfs_buf_hold(bp);
1335 xfs_trans_brelse(tp, bp);
1336
1337 spin_lock(&qlip->qli_lock);
1338 lip->li_buf = bp;
1339 }
1340 qlip->qli_dirty = true;
1341 spin_unlock(&qlip->qli_lock);
1342
1343 return 0;
1344 }
1345
1346 /*
1347 * Get a new reference the dquot buffer attached to this dquot for a dqflush
1348 * operation.
1349 *
1350 * Returns 0 and a NULL bp if none was attached to the dquot; 0 and a locked
1351 * bp; or -EAGAIN if the buffer could not be locked.
1352 */
1353 int
xfs_dquot_use_attached_buf(struct xfs_dquot * dqp,struct xfs_buf ** bpp)1354 xfs_dquot_use_attached_buf(
1355 struct xfs_dquot *dqp,
1356 struct xfs_buf **bpp)
1357 {
1358 struct xfs_buf *bp = dqp->q_logitem.qli_item.li_buf;
1359
1360 /*
1361 * A NULL buffer can happen if the dquot dirty flag was set but the
1362 * filesystem shut down before transaction commit happened. In that
1363 * case we're not going to flush anyway.
1364 */
1365 if (!bp) {
1366 ASSERT(xfs_is_shutdown(dqp->q_mount));
1367
1368 *bpp = NULL;
1369 return 0;
1370 }
1371
1372 if (!xfs_buf_trylock(bp))
1373 return -EAGAIN;
1374
1375 xfs_buf_hold(bp);
1376 *bpp = bp;
1377 return 0;
1378 }
1379
1380 /*
1381 * Write a modified dquot to disk.
1382 * The dquot must be locked and the flush lock too taken by caller.
1383 * The flush lock will not be unlocked until the dquot reaches the disk,
1384 * but the dquot is free to be unlocked and modified by the caller
1385 * in the interim. Dquot is still locked on return. This behavior is
1386 * identical to that of inodes.
1387 */
1388 int
xfs_qm_dqflush(struct xfs_dquot * dqp,struct xfs_buf * bp)1389 xfs_qm_dqflush(
1390 struct xfs_dquot *dqp,
1391 struct xfs_buf *bp)
1392 {
1393 struct xfs_mount *mp = dqp->q_mount;
1394 struct xfs_dq_logitem *qlip = &dqp->q_logitem;
1395 struct xfs_log_item *lip = &qlip->qli_item;
1396 struct xfs_dqblk *dqblk;
1397 xfs_failaddr_t fa;
1398 int error;
1399
1400 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1401 ASSERT(!completion_done(&dqp->q_flush));
1402
1403 trace_xfs_dqflush(dqp);
1404
1405 xfs_qm_dqunpin_wait(dqp);
1406
1407 fa = xfs_qm_dqflush_check(dqp);
1408 if (fa) {
1409 xfs_alert(mp, "corrupt dquot ID 0x%x in memory at %pS",
1410 dqp->q_id, fa);
1411 xfs_dquot_mark_sick(dqp);
1412 error = -EFSCORRUPTED;
1413 goto out_abort;
1414 }
1415
1416 /* Flush the incore dquot to the ondisk buffer. */
1417 dqblk = xfs_buf_offset(bp, dqp->q_bufoffset);
1418 xfs_dquot_to_disk(&dqblk->dd_diskdq, dqp);
1419
1420 /*
1421 * Clear the dirty field and remember the flush lsn for later use.
1422 */
1423 dqp->q_flags &= ~XFS_DQFLAG_DIRTY;
1424
1425 /*
1426 * We hold the dquot lock, so nobody can dirty it while we're
1427 * scheduling the write out. Clear the dirty-since-flush flag.
1428 */
1429 spin_lock(&qlip->qli_lock);
1430 qlip->qli_dirty = false;
1431 spin_unlock(&qlip->qli_lock);
1432
1433 xfs_trans_ail_copy_lsn(mp->m_ail, &qlip->qli_flush_lsn, &lip->li_lsn);
1434
1435 /*
1436 * copy the lsn into the on-disk dquot now while we have the in memory
1437 * dquot here. This can't be done later in the write verifier as we
1438 * can't get access to the log item at that point in time.
1439 *
1440 * We also calculate the CRC here so that the on-disk dquot in the
1441 * buffer always has a valid CRC. This ensures there is no possibility
1442 * of a dquot without an up-to-date CRC getting to disk.
1443 */
1444 if (xfs_has_crc(mp)) {
1445 dqblk->dd_lsn = cpu_to_be64(lip->li_lsn);
1446 xfs_update_cksum((char *)dqblk, sizeof(struct xfs_dqblk),
1447 XFS_DQUOT_CRC_OFF);
1448 }
1449
1450 /*
1451 * Attach the dquot to the buffer so that we can remove this dquot from
1452 * the AIL and release the flush lock once the dquot is synced to disk.
1453 */
1454 bp->b_iodone = xfs_buf_dquot_iodone;
1455 list_add_tail(&lip->li_bio_list, &bp->b_li_list);
1456
1457 /*
1458 * If the buffer is pinned then push on the log so we won't
1459 * get stuck waiting in the write for too long.
1460 */
1461 if (xfs_buf_ispinned(bp)) {
1462 trace_xfs_dqflush_force(dqp);
1463 xfs_log_force(mp, 0);
1464 }
1465
1466 trace_xfs_dqflush_done(dqp);
1467 return 0;
1468
1469 out_abort:
1470 dqp->q_flags &= ~XFS_DQFLAG_DIRTY;
1471 xfs_trans_ail_delete(lip, 0);
1472 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1473 xfs_dqfunlock(dqp);
1474 return error;
1475 }
1476
1477 /*
1478 * Lock two xfs_dquot structures.
1479 *
1480 * To avoid deadlocks we always lock the quota structure with
1481 * the lowerd id first.
1482 */
1483 void
xfs_dqlock2(struct xfs_dquot * d1,struct xfs_dquot * d2)1484 xfs_dqlock2(
1485 struct xfs_dquot *d1,
1486 struct xfs_dquot *d2)
1487 {
1488 if (d1 && d2) {
1489 ASSERT(d1 != d2);
1490 if (d1->q_id > d2->q_id) {
1491 mutex_lock(&d2->q_qlock);
1492 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
1493 } else {
1494 mutex_lock(&d1->q_qlock);
1495 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
1496 }
1497 } else if (d1) {
1498 mutex_lock(&d1->q_qlock);
1499 } else if (d2) {
1500 mutex_lock(&d2->q_qlock);
1501 }
1502 }
1503
1504 static int
xfs_dqtrx_cmp(const void * a,const void * b)1505 xfs_dqtrx_cmp(
1506 const void *a,
1507 const void *b)
1508 {
1509 const struct xfs_dqtrx *qa = a;
1510 const struct xfs_dqtrx *qb = b;
1511
1512 if (qa->qt_dquot->q_id > qb->qt_dquot->q_id)
1513 return 1;
1514 if (qa->qt_dquot->q_id < qb->qt_dquot->q_id)
1515 return -1;
1516 return 0;
1517 }
1518
1519 void
xfs_dqlockn(struct xfs_dqtrx * q)1520 xfs_dqlockn(
1521 struct xfs_dqtrx *q)
1522 {
1523 unsigned int i;
1524
1525 BUILD_BUG_ON(XFS_QM_TRANS_MAXDQS > MAX_LOCKDEP_SUBCLASSES);
1526
1527 /* Sort in order of dquot id, do not allow duplicates */
1528 for (i = 0; i < XFS_QM_TRANS_MAXDQS && q[i].qt_dquot != NULL; i++) {
1529 unsigned int j;
1530
1531 for (j = 0; j < i; j++)
1532 ASSERT(q[i].qt_dquot != q[j].qt_dquot);
1533 }
1534 if (i == 0)
1535 return;
1536
1537 sort(q, i, sizeof(struct xfs_dqtrx), xfs_dqtrx_cmp, NULL);
1538
1539 mutex_lock(&q[0].qt_dquot->q_qlock);
1540 for (i = 1; i < XFS_QM_TRANS_MAXDQS && q[i].qt_dquot != NULL; i++)
1541 mutex_lock_nested(&q[i].qt_dquot->q_qlock,
1542 XFS_QLOCK_NESTED + i - 1);
1543 }
1544
1545 int __init
xfs_qm_init(void)1546 xfs_qm_init(void)
1547 {
1548 xfs_dquot_cache = kmem_cache_create("xfs_dquot",
1549 sizeof(struct xfs_dquot),
1550 0, 0, NULL);
1551 if (!xfs_dquot_cache)
1552 goto out;
1553
1554 xfs_dqtrx_cache = kmem_cache_create("xfs_dqtrx",
1555 sizeof(struct xfs_dquot_acct),
1556 0, 0, NULL);
1557 if (!xfs_dqtrx_cache)
1558 goto out_free_dquot_cache;
1559
1560 return 0;
1561
1562 out_free_dquot_cache:
1563 kmem_cache_destroy(xfs_dquot_cache);
1564 out:
1565 return -ENOMEM;
1566 }
1567
1568 void
xfs_qm_exit(void)1569 xfs_qm_exit(void)
1570 {
1571 kmem_cache_destroy(xfs_dqtrx_cache);
1572 kmem_cache_destroy(xfs_dquot_cache);
1573 }
1574