xref: /openbmc/linux/fs/xfs/xfs_qm.c (revision 92a2c6b2)
1 /*
2  * Copyright (c) 2000-2005 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_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
24 #include "xfs_bit.h"
25 #include "xfs_sb.h"
26 #include "xfs_mount.h"
27 #include "xfs_inode.h"
28 #include "xfs_ialloc.h"
29 #include "xfs_itable.h"
30 #include "xfs_quota.h"
31 #include "xfs_error.h"
32 #include "xfs_bmap.h"
33 #include "xfs_bmap_btree.h"
34 #include "xfs_trans.h"
35 #include "xfs_trans_space.h"
36 #include "xfs_qm.h"
37 #include "xfs_trace.h"
38 #include "xfs_icache.h"
39 #include "xfs_cksum.h"
40 
41 /*
42  * The global quota manager. There is only one of these for the entire
43  * system, _not_ one per file system. XQM keeps track of the overall
44  * quota functionality, including maintaining the freelist and hash
45  * tables of dquots.
46  */
47 STATIC int	xfs_qm_init_quotainos(xfs_mount_t *);
48 STATIC int	xfs_qm_init_quotainfo(xfs_mount_t *);
49 
50 
51 STATIC void	xfs_qm_dqfree_one(struct xfs_dquot *dqp);
52 /*
53  * We use the batch lookup interface to iterate over the dquots as it
54  * currently is the only interface into the radix tree code that allows
55  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
56  * operations is fine as all callers are used either during mount/umount
57  * or quotaoff.
58  */
59 #define XFS_DQ_LOOKUP_BATCH	32
60 
61 STATIC int
62 xfs_qm_dquot_walk(
63 	struct xfs_mount	*mp,
64 	int			type,
65 	int			(*execute)(struct xfs_dquot *dqp, void *data),
66 	void			*data)
67 {
68 	struct xfs_quotainfo	*qi = mp->m_quotainfo;
69 	struct radix_tree_root	*tree = xfs_dquot_tree(qi, type);
70 	uint32_t		next_index;
71 	int			last_error = 0;
72 	int			skipped;
73 	int			nr_found;
74 
75 restart:
76 	skipped = 0;
77 	next_index = 0;
78 	nr_found = 0;
79 
80 	while (1) {
81 		struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
82 		int		error = 0;
83 		int		i;
84 
85 		mutex_lock(&qi->qi_tree_lock);
86 		nr_found = radix_tree_gang_lookup(tree, (void **)batch,
87 					next_index, XFS_DQ_LOOKUP_BATCH);
88 		if (!nr_found) {
89 			mutex_unlock(&qi->qi_tree_lock);
90 			break;
91 		}
92 
93 		for (i = 0; i < nr_found; i++) {
94 			struct xfs_dquot *dqp = batch[i];
95 
96 			next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
97 
98 			error = execute(batch[i], data);
99 			if (error == -EAGAIN) {
100 				skipped++;
101 				continue;
102 			}
103 			if (error && last_error != -EFSCORRUPTED)
104 				last_error = error;
105 		}
106 
107 		mutex_unlock(&qi->qi_tree_lock);
108 
109 		/* bail out if the filesystem is corrupted.  */
110 		if (last_error == -EFSCORRUPTED) {
111 			skipped = 0;
112 			break;
113 		}
114 	}
115 
116 	if (skipped) {
117 		delay(1);
118 		goto restart;
119 	}
120 
121 	return last_error;
122 }
123 
124 
125 /*
126  * Purge a dquot from all tracking data structures and free it.
127  */
128 STATIC int
129 xfs_qm_dqpurge(
130 	struct xfs_dquot	*dqp,
131 	void			*data)
132 {
133 	struct xfs_mount	*mp = dqp->q_mount;
134 	struct xfs_quotainfo	*qi = mp->m_quotainfo;
135 
136 	xfs_dqlock(dqp);
137 	if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
138 		xfs_dqunlock(dqp);
139 		return -EAGAIN;
140 	}
141 
142 	dqp->dq_flags |= XFS_DQ_FREEING;
143 
144 	xfs_dqflock(dqp);
145 
146 	/*
147 	 * If we are turning this type of quotas off, we don't care
148 	 * about the dirty metadata sitting in this dquot. OTOH, if
149 	 * we're unmounting, we do care, so we flush it and wait.
150 	 */
151 	if (XFS_DQ_IS_DIRTY(dqp)) {
152 		struct xfs_buf	*bp = NULL;
153 		int		error;
154 
155 		/*
156 		 * We don't care about getting disk errors here. We need
157 		 * to purge this dquot anyway, so we go ahead regardless.
158 		 */
159 		error = xfs_qm_dqflush(dqp, &bp);
160 		if (error) {
161 			xfs_warn(mp, "%s: dquot %p flush failed",
162 				__func__, dqp);
163 		} else {
164 			error = xfs_bwrite(bp);
165 			xfs_buf_relse(bp);
166 		}
167 		xfs_dqflock(dqp);
168 	}
169 
170 	ASSERT(atomic_read(&dqp->q_pincount) == 0);
171 	ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
172 	       !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
173 
174 	xfs_dqfunlock(dqp);
175 	xfs_dqunlock(dqp);
176 
177 	radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
178 			  be32_to_cpu(dqp->q_core.d_id));
179 	qi->qi_dquots--;
180 
181 	/*
182 	 * We move dquots to the freelist as soon as their reference count
183 	 * hits zero, so it really should be on the freelist here.
184 	 */
185 	ASSERT(!list_empty(&dqp->q_lru));
186 	list_lru_del(&qi->qi_lru, &dqp->q_lru);
187 	XFS_STATS_DEC(xs_qm_dquot_unused);
188 
189 	xfs_qm_dqdestroy(dqp);
190 	return 0;
191 }
192 
193 /*
194  * Purge the dquot cache.
195  */
196 void
197 xfs_qm_dqpurge_all(
198 	struct xfs_mount	*mp,
199 	uint			flags)
200 {
201 	if (flags & XFS_QMOPT_UQUOTA)
202 		xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
203 	if (flags & XFS_QMOPT_GQUOTA)
204 		xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
205 	if (flags & XFS_QMOPT_PQUOTA)
206 		xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
207 }
208 
209 /*
210  * Just destroy the quotainfo structure.
211  */
212 void
213 xfs_qm_unmount(
214 	struct xfs_mount	*mp)
215 {
216 	if (mp->m_quotainfo) {
217 		xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
218 		xfs_qm_destroy_quotainfo(mp);
219 	}
220 }
221 
222 /*
223  * Called from the vfsops layer.
224  */
225 void
226 xfs_qm_unmount_quotas(
227 	xfs_mount_t	*mp)
228 {
229 	/*
230 	 * Release the dquots that root inode, et al might be holding,
231 	 * before we flush quotas and blow away the quotainfo structure.
232 	 */
233 	ASSERT(mp->m_rootip);
234 	xfs_qm_dqdetach(mp->m_rootip);
235 	if (mp->m_rbmip)
236 		xfs_qm_dqdetach(mp->m_rbmip);
237 	if (mp->m_rsumip)
238 		xfs_qm_dqdetach(mp->m_rsumip);
239 
240 	/*
241 	 * Release the quota inodes.
242 	 */
243 	if (mp->m_quotainfo) {
244 		if (mp->m_quotainfo->qi_uquotaip) {
245 			IRELE(mp->m_quotainfo->qi_uquotaip);
246 			mp->m_quotainfo->qi_uquotaip = NULL;
247 		}
248 		if (mp->m_quotainfo->qi_gquotaip) {
249 			IRELE(mp->m_quotainfo->qi_gquotaip);
250 			mp->m_quotainfo->qi_gquotaip = NULL;
251 		}
252 		if (mp->m_quotainfo->qi_pquotaip) {
253 			IRELE(mp->m_quotainfo->qi_pquotaip);
254 			mp->m_quotainfo->qi_pquotaip = NULL;
255 		}
256 	}
257 }
258 
259 STATIC int
260 xfs_qm_dqattach_one(
261 	xfs_inode_t	*ip,
262 	xfs_dqid_t	id,
263 	uint		type,
264 	uint		doalloc,
265 	xfs_dquot_t	**IO_idqpp)
266 {
267 	xfs_dquot_t	*dqp;
268 	int		error;
269 
270 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
271 	error = 0;
272 
273 	/*
274 	 * See if we already have it in the inode itself. IO_idqpp is &i_udquot
275 	 * or &i_gdquot. This made the code look weird, but made the logic a lot
276 	 * simpler.
277 	 */
278 	dqp = *IO_idqpp;
279 	if (dqp) {
280 		trace_xfs_dqattach_found(dqp);
281 		return 0;
282 	}
283 
284 	/*
285 	 * Find the dquot from somewhere. This bumps the reference count of
286 	 * dquot and returns it locked.  This can return ENOENT if dquot didn't
287 	 * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
288 	 * turned off suddenly.
289 	 */
290 	error = xfs_qm_dqget(ip->i_mount, ip, id, type,
291 			     doalloc | XFS_QMOPT_DOWARN, &dqp);
292 	if (error)
293 		return error;
294 
295 	trace_xfs_dqattach_get(dqp);
296 
297 	/*
298 	 * dqget may have dropped and re-acquired the ilock, but it guarantees
299 	 * that the dquot returned is the one that should go in the inode.
300 	 */
301 	*IO_idqpp = dqp;
302 	xfs_dqunlock(dqp);
303 	return 0;
304 }
305 
306 static bool
307 xfs_qm_need_dqattach(
308 	struct xfs_inode	*ip)
309 {
310 	struct xfs_mount	*mp = ip->i_mount;
311 
312 	if (!XFS_IS_QUOTA_RUNNING(mp))
313 		return false;
314 	if (!XFS_IS_QUOTA_ON(mp))
315 		return false;
316 	if (!XFS_NOT_DQATTACHED(mp, ip))
317 		return false;
318 	if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
319 		return false;
320 	return true;
321 }
322 
323 /*
324  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
325  * into account.
326  * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
327  * Inode may get unlocked and relocked in here, and the caller must deal with
328  * the consequences.
329  */
330 int
331 xfs_qm_dqattach_locked(
332 	xfs_inode_t	*ip,
333 	uint		flags)
334 {
335 	xfs_mount_t	*mp = ip->i_mount;
336 	int		error = 0;
337 
338 	if (!xfs_qm_need_dqattach(ip))
339 		return 0;
340 
341 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
342 
343 	if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
344 		error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
345 						flags & XFS_QMOPT_DQALLOC,
346 						&ip->i_udquot);
347 		if (error)
348 			goto done;
349 		ASSERT(ip->i_udquot);
350 	}
351 
352 	if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
353 		error = xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
354 						flags & XFS_QMOPT_DQALLOC,
355 						&ip->i_gdquot);
356 		if (error)
357 			goto done;
358 		ASSERT(ip->i_gdquot);
359 	}
360 
361 	if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
362 		error = xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
363 						flags & XFS_QMOPT_DQALLOC,
364 						&ip->i_pdquot);
365 		if (error)
366 			goto done;
367 		ASSERT(ip->i_pdquot);
368 	}
369 
370 done:
371 	/*
372 	 * Don't worry about the dquots that we may have attached before any
373 	 * error - they'll get detached later if it has not already been done.
374 	 */
375 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
376 	return error;
377 }
378 
379 int
380 xfs_qm_dqattach(
381 	struct xfs_inode	*ip,
382 	uint			flags)
383 {
384 	int			error;
385 
386 	if (!xfs_qm_need_dqattach(ip))
387 		return 0;
388 
389 	xfs_ilock(ip, XFS_ILOCK_EXCL);
390 	error = xfs_qm_dqattach_locked(ip, flags);
391 	xfs_iunlock(ip, XFS_ILOCK_EXCL);
392 
393 	return error;
394 }
395 
396 /*
397  * Release dquots (and their references) if any.
398  * The inode should be locked EXCL except when this's called by
399  * xfs_ireclaim.
400  */
401 void
402 xfs_qm_dqdetach(
403 	xfs_inode_t	*ip)
404 {
405 	if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
406 		return;
407 
408 	trace_xfs_dquot_dqdetach(ip);
409 
410 	ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
411 	if (ip->i_udquot) {
412 		xfs_qm_dqrele(ip->i_udquot);
413 		ip->i_udquot = NULL;
414 	}
415 	if (ip->i_gdquot) {
416 		xfs_qm_dqrele(ip->i_gdquot);
417 		ip->i_gdquot = NULL;
418 	}
419 	if (ip->i_pdquot) {
420 		xfs_qm_dqrele(ip->i_pdquot);
421 		ip->i_pdquot = NULL;
422 	}
423 }
424 
425 struct xfs_qm_isolate {
426 	struct list_head	buffers;
427 	struct list_head	dispose;
428 };
429 
430 static enum lru_status
431 xfs_qm_dquot_isolate(
432 	struct list_head	*item,
433 	struct list_lru_one	*lru,
434 	spinlock_t		*lru_lock,
435 	void			*arg)
436 		__releases(lru_lock) __acquires(lru_lock)
437 {
438 	struct xfs_dquot	*dqp = container_of(item,
439 						struct xfs_dquot, q_lru);
440 	struct xfs_qm_isolate	*isol = arg;
441 
442 	if (!xfs_dqlock_nowait(dqp))
443 		goto out_miss_busy;
444 
445 	/*
446 	 * This dquot has acquired a reference in the meantime remove it from
447 	 * the freelist and try again.
448 	 */
449 	if (dqp->q_nrefs) {
450 		xfs_dqunlock(dqp);
451 		XFS_STATS_INC(xs_qm_dqwants);
452 
453 		trace_xfs_dqreclaim_want(dqp);
454 		list_lru_isolate(lru, &dqp->q_lru);
455 		XFS_STATS_DEC(xs_qm_dquot_unused);
456 		return LRU_REMOVED;
457 	}
458 
459 	/*
460 	 * If the dquot is dirty, flush it. If it's already being flushed, just
461 	 * skip it so there is time for the IO to complete before we try to
462 	 * reclaim it again on the next LRU pass.
463 	 */
464 	if (!xfs_dqflock_nowait(dqp)) {
465 		xfs_dqunlock(dqp);
466 		goto out_miss_busy;
467 	}
468 
469 	if (XFS_DQ_IS_DIRTY(dqp)) {
470 		struct xfs_buf	*bp = NULL;
471 		int		error;
472 
473 		trace_xfs_dqreclaim_dirty(dqp);
474 
475 		/* we have to drop the LRU lock to flush the dquot */
476 		spin_unlock(lru_lock);
477 
478 		error = xfs_qm_dqflush(dqp, &bp);
479 		if (error) {
480 			xfs_warn(dqp->q_mount, "%s: dquot %p flush failed",
481 				 __func__, dqp);
482 			goto out_unlock_dirty;
483 		}
484 
485 		xfs_buf_delwri_queue(bp, &isol->buffers);
486 		xfs_buf_relse(bp);
487 		goto out_unlock_dirty;
488 	}
489 	xfs_dqfunlock(dqp);
490 
491 	/*
492 	 * Prevent lookups now that we are past the point of no return.
493 	 */
494 	dqp->dq_flags |= XFS_DQ_FREEING;
495 	xfs_dqunlock(dqp);
496 
497 	ASSERT(dqp->q_nrefs == 0);
498 	list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
499 	XFS_STATS_DEC(xs_qm_dquot_unused);
500 	trace_xfs_dqreclaim_done(dqp);
501 	XFS_STATS_INC(xs_qm_dqreclaims);
502 	return LRU_REMOVED;
503 
504 out_miss_busy:
505 	trace_xfs_dqreclaim_busy(dqp);
506 	XFS_STATS_INC(xs_qm_dqreclaim_misses);
507 	return LRU_SKIP;
508 
509 out_unlock_dirty:
510 	trace_xfs_dqreclaim_busy(dqp);
511 	XFS_STATS_INC(xs_qm_dqreclaim_misses);
512 	xfs_dqunlock(dqp);
513 	spin_lock(lru_lock);
514 	return LRU_RETRY;
515 }
516 
517 static unsigned long
518 xfs_qm_shrink_scan(
519 	struct shrinker		*shrink,
520 	struct shrink_control	*sc)
521 {
522 	struct xfs_quotainfo	*qi = container_of(shrink,
523 					struct xfs_quotainfo, qi_shrinker);
524 	struct xfs_qm_isolate	isol;
525 	unsigned long		freed;
526 	int			error;
527 
528 	if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
529 		return 0;
530 
531 	INIT_LIST_HEAD(&isol.buffers);
532 	INIT_LIST_HEAD(&isol.dispose);
533 
534 	freed = list_lru_shrink_walk(&qi->qi_lru, sc,
535 				     xfs_qm_dquot_isolate, &isol);
536 
537 	error = xfs_buf_delwri_submit(&isol.buffers);
538 	if (error)
539 		xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
540 
541 	while (!list_empty(&isol.dispose)) {
542 		struct xfs_dquot	*dqp;
543 
544 		dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
545 		list_del_init(&dqp->q_lru);
546 		xfs_qm_dqfree_one(dqp);
547 	}
548 
549 	return freed;
550 }
551 
552 static unsigned long
553 xfs_qm_shrink_count(
554 	struct shrinker		*shrink,
555 	struct shrink_control	*sc)
556 {
557 	struct xfs_quotainfo	*qi = container_of(shrink,
558 					struct xfs_quotainfo, qi_shrinker);
559 
560 	return list_lru_shrink_count(&qi->qi_lru, sc);
561 }
562 
563 /*
564  * This initializes all the quota information that's kept in the
565  * mount structure
566  */
567 STATIC int
568 xfs_qm_init_quotainfo(
569 	xfs_mount_t	*mp)
570 {
571 	xfs_quotainfo_t *qinf;
572 	int		error;
573 	xfs_dquot_t	*dqp;
574 
575 	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
576 
577 	qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
578 
579 	error = list_lru_init(&qinf->qi_lru);
580 	if (error)
581 		goto out_free_qinf;
582 
583 	/*
584 	 * See if quotainodes are setup, and if not, allocate them,
585 	 * and change the superblock accordingly.
586 	 */
587 	error = xfs_qm_init_quotainos(mp);
588 	if (error)
589 		goto out_free_lru;
590 
591 	INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
592 	INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
593 	INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
594 	mutex_init(&qinf->qi_tree_lock);
595 
596 	/* mutex used to serialize quotaoffs */
597 	mutex_init(&qinf->qi_quotaofflock);
598 
599 	/* Precalc some constants */
600 	qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
601 	qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
602 
603 	mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
604 
605 	/*
606 	 * We try to get the limits from the superuser's limits fields.
607 	 * This is quite hacky, but it is standard quota practice.
608 	 *
609 	 * We look at the USR dquot with id == 0 first, but if user quotas
610 	 * are not enabled we goto the GRP dquot with id == 0.
611 	 * We don't really care to keep separate default limits for user
612 	 * and group quotas, at least not at this point.
613 	 *
614 	 * Since we may not have done a quotacheck by this point, just read
615 	 * the dquot without attaching it to any hashtables or lists.
616 	 */
617 	error = xfs_qm_dqread(mp, 0,
618 			XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
619 			 (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
620 			  XFS_DQ_PROJ),
621 			XFS_QMOPT_DOWARN, &dqp);
622 	if (!error) {
623 		xfs_disk_dquot_t	*ddqp = &dqp->q_core;
624 
625 		/*
626 		 * The warnings and timers set the grace period given to
627 		 * a user or group before he or she can not perform any
628 		 * more writing. If it is zero, a default is used.
629 		 */
630 		qinf->qi_btimelimit = ddqp->d_btimer ?
631 			be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
632 		qinf->qi_itimelimit = ddqp->d_itimer ?
633 			be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
634 		qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
635 			be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
636 		qinf->qi_bwarnlimit = ddqp->d_bwarns ?
637 			be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
638 		qinf->qi_iwarnlimit = ddqp->d_iwarns ?
639 			be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
640 		qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
641 			be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
642 		qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
643 		qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
644 		qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
645 		qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
646 		qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
647 		qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
648 
649 		xfs_qm_dqdestroy(dqp);
650 	} else {
651 		qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
652 		qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
653 		qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
654 		qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
655 		qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
656 		qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
657 	}
658 
659 	qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
660 	qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
661 	qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
662 	qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
663 	register_shrinker(&qinf->qi_shrinker);
664 	return 0;
665 
666 out_free_lru:
667 	list_lru_destroy(&qinf->qi_lru);
668 out_free_qinf:
669 	kmem_free(qinf);
670 	mp->m_quotainfo = NULL;
671 	return error;
672 }
673 
674 
675 /*
676  * Gets called when unmounting a filesystem or when all quotas get
677  * turned off.
678  * This purges the quota inodes, destroys locks and frees itself.
679  */
680 void
681 xfs_qm_destroy_quotainfo(
682 	xfs_mount_t	*mp)
683 {
684 	xfs_quotainfo_t *qi;
685 
686 	qi = mp->m_quotainfo;
687 	ASSERT(qi != NULL);
688 
689 	unregister_shrinker(&qi->qi_shrinker);
690 	list_lru_destroy(&qi->qi_lru);
691 
692 	if (qi->qi_uquotaip) {
693 		IRELE(qi->qi_uquotaip);
694 		qi->qi_uquotaip = NULL; /* paranoia */
695 	}
696 	if (qi->qi_gquotaip) {
697 		IRELE(qi->qi_gquotaip);
698 		qi->qi_gquotaip = NULL;
699 	}
700 	if (qi->qi_pquotaip) {
701 		IRELE(qi->qi_pquotaip);
702 		qi->qi_pquotaip = NULL;
703 	}
704 	mutex_destroy(&qi->qi_quotaofflock);
705 	kmem_free(qi);
706 	mp->m_quotainfo = NULL;
707 }
708 
709 /*
710  * Create an inode and return with a reference already taken, but unlocked
711  * This is how we create quota inodes
712  */
713 STATIC int
714 xfs_qm_qino_alloc(
715 	xfs_mount_t	*mp,
716 	xfs_inode_t	**ip,
717 	uint		flags)
718 {
719 	xfs_trans_t	*tp;
720 	int		error;
721 	int		committed;
722 
723 	*ip = NULL;
724 	/*
725 	 * With superblock that doesn't have separate pquotino, we
726 	 * share an inode between gquota and pquota. If the on-disk
727 	 * superblock has GQUOTA and the filesystem is now mounted
728 	 * with PQUOTA, just use sb_gquotino for sb_pquotino and
729 	 * vice-versa.
730 	 */
731 	if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
732 			(flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
733 		xfs_ino_t ino = NULLFSINO;
734 
735 		if ((flags & XFS_QMOPT_PQUOTA) &&
736 			     (mp->m_sb.sb_gquotino != NULLFSINO)) {
737 			ino = mp->m_sb.sb_gquotino;
738 			ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
739 		} else if ((flags & XFS_QMOPT_GQUOTA) &&
740 			     (mp->m_sb.sb_pquotino != NULLFSINO)) {
741 			ino = mp->m_sb.sb_pquotino;
742 			ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
743 		}
744 		if (ino != NULLFSINO) {
745 			error = xfs_iget(mp, NULL, ino, 0, 0, ip);
746 			if (error)
747 				return error;
748 			mp->m_sb.sb_gquotino = NULLFSINO;
749 			mp->m_sb.sb_pquotino = NULLFSINO;
750 		}
751 	}
752 
753 	tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
754 	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_create,
755 				  XFS_QM_QINOCREATE_SPACE_RES(mp), 0);
756 	if (error) {
757 		xfs_trans_cancel(tp, 0);
758 		return error;
759 	}
760 
761 	if (!*ip) {
762 		error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
763 								&committed);
764 		if (error) {
765 			xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
766 					 XFS_TRANS_ABORT);
767 			return error;
768 		}
769 	}
770 
771 	/*
772 	 * Make the changes in the superblock, and log those too.
773 	 * sbfields arg may contain fields other than *QUOTINO;
774 	 * VERSIONNUM for example.
775 	 */
776 	spin_lock(&mp->m_sb_lock);
777 	if (flags & XFS_QMOPT_SBVERSION) {
778 		ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
779 
780 		xfs_sb_version_addquota(&mp->m_sb);
781 		mp->m_sb.sb_uquotino = NULLFSINO;
782 		mp->m_sb.sb_gquotino = NULLFSINO;
783 		mp->m_sb.sb_pquotino = NULLFSINO;
784 
785 		/* qflags will get updated fully _after_ quotacheck */
786 		mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
787 	}
788 	if (flags & XFS_QMOPT_UQUOTA)
789 		mp->m_sb.sb_uquotino = (*ip)->i_ino;
790 	else if (flags & XFS_QMOPT_GQUOTA)
791 		mp->m_sb.sb_gquotino = (*ip)->i_ino;
792 	else
793 		mp->m_sb.sb_pquotino = (*ip)->i_ino;
794 	spin_unlock(&mp->m_sb_lock);
795 	xfs_log_sb(tp);
796 
797 	if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
798 		xfs_alert(mp, "%s failed (error %d)!", __func__, error);
799 		return error;
800 	}
801 	return 0;
802 }
803 
804 
805 STATIC void
806 xfs_qm_reset_dqcounts(
807 	xfs_mount_t	*mp,
808 	xfs_buf_t	*bp,
809 	xfs_dqid_t	id,
810 	uint		type)
811 {
812 	struct xfs_dqblk	*dqb;
813 	int			j;
814 
815 	trace_xfs_reset_dqcounts(bp, _RET_IP_);
816 
817 	/*
818 	 * Reset all counters and timers. They'll be
819 	 * started afresh by xfs_qm_quotacheck.
820 	 */
821 #ifdef DEBUG
822 	j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
823 	do_div(j, sizeof(xfs_dqblk_t));
824 	ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
825 #endif
826 	dqb = bp->b_addr;
827 	for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
828 		struct xfs_disk_dquot	*ddq;
829 
830 		ddq = (struct xfs_disk_dquot *)&dqb[j];
831 
832 		/*
833 		 * Do a sanity check, and if needed, repair the dqblk. Don't
834 		 * output any warnings because it's perfectly possible to
835 		 * find uninitialised dquot blks. See comment in xfs_dqcheck.
836 		 */
837 		xfs_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
838 			    "xfs_quotacheck");
839 		ddq->d_bcount = 0;
840 		ddq->d_icount = 0;
841 		ddq->d_rtbcount = 0;
842 		ddq->d_btimer = 0;
843 		ddq->d_itimer = 0;
844 		ddq->d_rtbtimer = 0;
845 		ddq->d_bwarns = 0;
846 		ddq->d_iwarns = 0;
847 		ddq->d_rtbwarns = 0;
848 
849 		if (xfs_sb_version_hascrc(&mp->m_sb)) {
850 			xfs_update_cksum((char *)&dqb[j],
851 					 sizeof(struct xfs_dqblk),
852 					 XFS_DQUOT_CRC_OFF);
853 		}
854 	}
855 }
856 
857 STATIC int
858 xfs_qm_dqiter_bufs(
859 	struct xfs_mount	*mp,
860 	xfs_dqid_t		firstid,
861 	xfs_fsblock_t		bno,
862 	xfs_filblks_t		blkcnt,
863 	uint			flags,
864 	struct list_head	*buffer_list)
865 {
866 	struct xfs_buf		*bp;
867 	int			error;
868 	int			type;
869 
870 	ASSERT(blkcnt > 0);
871 	type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
872 		(flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
873 	error = 0;
874 
875 	/*
876 	 * Blkcnt arg can be a very big number, and might even be
877 	 * larger than the log itself. So, we have to break it up into
878 	 * manageable-sized transactions.
879 	 * Note that we don't start a permanent transaction here; we might
880 	 * not be able to get a log reservation for the whole thing up front,
881 	 * and we don't really care to either, because we just discard
882 	 * everything if we were to crash in the middle of this loop.
883 	 */
884 	while (blkcnt--) {
885 		error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
886 			      XFS_FSB_TO_DADDR(mp, bno),
887 			      mp->m_quotainfo->qi_dqchunklen, 0, &bp,
888 			      &xfs_dquot_buf_ops);
889 
890 		/*
891 		 * CRC and validation errors will return a EFSCORRUPTED here. If
892 		 * this occurs, re-read without CRC validation so that we can
893 		 * repair the damage via xfs_qm_reset_dqcounts(). This process
894 		 * will leave a trace in the log indicating corruption has
895 		 * been detected.
896 		 */
897 		if (error == -EFSCORRUPTED) {
898 			error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
899 				      XFS_FSB_TO_DADDR(mp, bno),
900 				      mp->m_quotainfo->qi_dqchunklen, 0, &bp,
901 				      NULL);
902 		}
903 
904 		if (error)
905 			break;
906 
907 		/*
908 		 * A corrupt buffer might not have a verifier attached, so
909 		 * make sure we have the correct one attached before writeback
910 		 * occurs.
911 		 */
912 		bp->b_ops = &xfs_dquot_buf_ops;
913 		xfs_qm_reset_dqcounts(mp, bp, firstid, type);
914 		xfs_buf_delwri_queue(bp, buffer_list);
915 		xfs_buf_relse(bp);
916 
917 		/* goto the next block. */
918 		bno++;
919 		firstid += mp->m_quotainfo->qi_dqperchunk;
920 	}
921 
922 	return error;
923 }
924 
925 /*
926  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
927  * caller supplied function for every chunk of dquots that we find.
928  */
929 STATIC int
930 xfs_qm_dqiterate(
931 	struct xfs_mount	*mp,
932 	struct xfs_inode	*qip,
933 	uint			flags,
934 	struct list_head	*buffer_list)
935 {
936 	struct xfs_bmbt_irec	*map;
937 	int			i, nmaps;	/* number of map entries */
938 	int			error;		/* return value */
939 	xfs_fileoff_t		lblkno;
940 	xfs_filblks_t		maxlblkcnt;
941 	xfs_dqid_t		firstid;
942 	xfs_fsblock_t		rablkno;
943 	xfs_filblks_t		rablkcnt;
944 
945 	error = 0;
946 	/*
947 	 * This looks racy, but we can't keep an inode lock across a
948 	 * trans_reserve. But, this gets called during quotacheck, and that
949 	 * happens only at mount time which is single threaded.
950 	 */
951 	if (qip->i_d.di_nblocks == 0)
952 		return 0;
953 
954 	map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
955 
956 	lblkno = 0;
957 	maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
958 	do {
959 		uint		lock_mode;
960 
961 		nmaps = XFS_DQITER_MAP_SIZE;
962 		/*
963 		 * We aren't changing the inode itself. Just changing
964 		 * some of its data. No new blocks are added here, and
965 		 * the inode is never added to the transaction.
966 		 */
967 		lock_mode = xfs_ilock_data_map_shared(qip);
968 		error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
969 				       map, &nmaps, 0);
970 		xfs_iunlock(qip, lock_mode);
971 		if (error)
972 			break;
973 
974 		ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
975 		for (i = 0; i < nmaps; i++) {
976 			ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
977 			ASSERT(map[i].br_blockcount);
978 
979 
980 			lblkno += map[i].br_blockcount;
981 
982 			if (map[i].br_startblock == HOLESTARTBLOCK)
983 				continue;
984 
985 			firstid = (xfs_dqid_t) map[i].br_startoff *
986 				mp->m_quotainfo->qi_dqperchunk;
987 			/*
988 			 * Do a read-ahead on the next extent.
989 			 */
990 			if ((i+1 < nmaps) &&
991 			    (map[i+1].br_startblock != HOLESTARTBLOCK)) {
992 				rablkcnt =  map[i+1].br_blockcount;
993 				rablkno = map[i+1].br_startblock;
994 				while (rablkcnt--) {
995 					xfs_buf_readahead(mp->m_ddev_targp,
996 					       XFS_FSB_TO_DADDR(mp, rablkno),
997 					       mp->m_quotainfo->qi_dqchunklen,
998 					       &xfs_dquot_buf_ops);
999 					rablkno++;
1000 				}
1001 			}
1002 			/*
1003 			 * Iterate thru all the blks in the extent and
1004 			 * reset the counters of all the dquots inside them.
1005 			 */
1006 			error = xfs_qm_dqiter_bufs(mp, firstid,
1007 						   map[i].br_startblock,
1008 						   map[i].br_blockcount,
1009 						   flags, buffer_list);
1010 			if (error)
1011 				goto out;
1012 		}
1013 	} while (nmaps > 0);
1014 
1015 out:
1016 	kmem_free(map);
1017 	return error;
1018 }
1019 
1020 /*
1021  * Called by dqusage_adjust in doing a quotacheck.
1022  *
1023  * Given the inode, and a dquot id this updates both the incore dqout as well
1024  * as the buffer copy. This is so that once the quotacheck is done, we can
1025  * just log all the buffers, as opposed to logging numerous updates to
1026  * individual dquots.
1027  */
1028 STATIC int
1029 xfs_qm_quotacheck_dqadjust(
1030 	struct xfs_inode	*ip,
1031 	xfs_dqid_t		id,
1032 	uint			type,
1033 	xfs_qcnt_t		nblks,
1034 	xfs_qcnt_t		rtblks)
1035 {
1036 	struct xfs_mount	*mp = ip->i_mount;
1037 	struct xfs_dquot	*dqp;
1038 	int			error;
1039 
1040 	error = xfs_qm_dqget(mp, ip, id, type,
1041 			     XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1042 	if (error) {
1043 		/*
1044 		 * Shouldn't be able to turn off quotas here.
1045 		 */
1046 		ASSERT(error != -ESRCH);
1047 		ASSERT(error != -ENOENT);
1048 		return error;
1049 	}
1050 
1051 	trace_xfs_dqadjust(dqp);
1052 
1053 	/*
1054 	 * Adjust the inode count and the block count to reflect this inode's
1055 	 * resource usage.
1056 	 */
1057 	be64_add_cpu(&dqp->q_core.d_icount, 1);
1058 	dqp->q_res_icount++;
1059 	if (nblks) {
1060 		be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1061 		dqp->q_res_bcount += nblks;
1062 	}
1063 	if (rtblks) {
1064 		be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1065 		dqp->q_res_rtbcount += rtblks;
1066 	}
1067 
1068 	/*
1069 	 * Set default limits, adjust timers (since we changed usages)
1070 	 *
1071 	 * There are no timers for the default values set in the root dquot.
1072 	 */
1073 	if (dqp->q_core.d_id) {
1074 		xfs_qm_adjust_dqlimits(mp, dqp);
1075 		xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1076 	}
1077 
1078 	dqp->dq_flags |= XFS_DQ_DIRTY;
1079 	xfs_qm_dqput(dqp);
1080 	return 0;
1081 }
1082 
1083 STATIC int
1084 xfs_qm_get_rtblks(
1085 	xfs_inode_t	*ip,
1086 	xfs_qcnt_t	*O_rtblks)
1087 {
1088 	xfs_filblks_t	rtblks;			/* total rt blks */
1089 	xfs_extnum_t	idx;			/* extent record index */
1090 	xfs_ifork_t	*ifp;			/* inode fork pointer */
1091 	xfs_extnum_t	nextents;		/* number of extent entries */
1092 	int		error;
1093 
1094 	ASSERT(XFS_IS_REALTIME_INODE(ip));
1095 	ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1096 	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1097 		if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1098 			return error;
1099 	}
1100 	rtblks = 0;
1101 	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1102 	for (idx = 0; idx < nextents; idx++)
1103 		rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1104 	*O_rtblks = (xfs_qcnt_t)rtblks;
1105 	return 0;
1106 }
1107 
1108 /*
1109  * callback routine supplied to bulkstat(). Given an inumber, find its
1110  * dquots and update them to account for resources taken by that inode.
1111  */
1112 /* ARGSUSED */
1113 STATIC int
1114 xfs_qm_dqusage_adjust(
1115 	xfs_mount_t	*mp,		/* mount point for filesystem */
1116 	xfs_ino_t	ino,		/* inode number to get data for */
1117 	void		__user *buffer,	/* not used */
1118 	int		ubsize,		/* not used */
1119 	int		*ubused,	/* not used */
1120 	int		*res)		/* result code value */
1121 {
1122 	xfs_inode_t	*ip;
1123 	xfs_qcnt_t	nblks, rtblks = 0;
1124 	int		error;
1125 
1126 	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1127 
1128 	/*
1129 	 * rootino must have its resources accounted for, not so with the quota
1130 	 * inodes.
1131 	 */
1132 	if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1133 		*res = BULKSTAT_RV_NOTHING;
1134 		return -EINVAL;
1135 	}
1136 
1137 	/*
1138 	 * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1139 	 * interface expects the inode to be exclusively locked because that's
1140 	 * the case in all other instances. It's OK that we do this because
1141 	 * quotacheck is done only at mount time.
1142 	 */
1143 	error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1144 	if (error) {
1145 		*res = BULKSTAT_RV_NOTHING;
1146 		return error;
1147 	}
1148 
1149 	ASSERT(ip->i_delayed_blks == 0);
1150 
1151 	if (XFS_IS_REALTIME_INODE(ip)) {
1152 		/*
1153 		 * Walk thru the extent list and count the realtime blocks.
1154 		 */
1155 		error = xfs_qm_get_rtblks(ip, &rtblks);
1156 		if (error)
1157 			goto error0;
1158 	}
1159 
1160 	nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1161 
1162 	/*
1163 	 * Add the (disk blocks and inode) resources occupied by this
1164 	 * inode to its dquots. We do this adjustment in the incore dquot,
1165 	 * and also copy the changes to its buffer.
1166 	 * We don't care about putting these changes in a transaction
1167 	 * envelope because if we crash in the middle of a 'quotacheck'
1168 	 * we have to start from the beginning anyway.
1169 	 * Once we're done, we'll log all the dquot bufs.
1170 	 *
1171 	 * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1172 	 * and quotaoffs don't race. (Quotachecks happen at mount time only).
1173 	 */
1174 	if (XFS_IS_UQUOTA_ON(mp)) {
1175 		error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1176 						   XFS_DQ_USER, nblks, rtblks);
1177 		if (error)
1178 			goto error0;
1179 	}
1180 
1181 	if (XFS_IS_GQUOTA_ON(mp)) {
1182 		error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1183 						   XFS_DQ_GROUP, nblks, rtblks);
1184 		if (error)
1185 			goto error0;
1186 	}
1187 
1188 	if (XFS_IS_PQUOTA_ON(mp)) {
1189 		error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1190 						   XFS_DQ_PROJ, nblks, rtblks);
1191 		if (error)
1192 			goto error0;
1193 	}
1194 
1195 	xfs_iunlock(ip, XFS_ILOCK_EXCL);
1196 	IRELE(ip);
1197 	*res = BULKSTAT_RV_DIDONE;
1198 	return 0;
1199 
1200 error0:
1201 	xfs_iunlock(ip, XFS_ILOCK_EXCL);
1202 	IRELE(ip);
1203 	*res = BULKSTAT_RV_GIVEUP;
1204 	return error;
1205 }
1206 
1207 STATIC int
1208 xfs_qm_flush_one(
1209 	struct xfs_dquot	*dqp,
1210 	void			*data)
1211 {
1212 	struct list_head	*buffer_list = data;
1213 	struct xfs_buf		*bp = NULL;
1214 	int			error = 0;
1215 
1216 	xfs_dqlock(dqp);
1217 	if (dqp->dq_flags & XFS_DQ_FREEING)
1218 		goto out_unlock;
1219 	if (!XFS_DQ_IS_DIRTY(dqp))
1220 		goto out_unlock;
1221 
1222 	xfs_dqflock(dqp);
1223 	error = xfs_qm_dqflush(dqp, &bp);
1224 	if (error)
1225 		goto out_unlock;
1226 
1227 	xfs_buf_delwri_queue(bp, buffer_list);
1228 	xfs_buf_relse(bp);
1229 out_unlock:
1230 	xfs_dqunlock(dqp);
1231 	return error;
1232 }
1233 
1234 /*
1235  * Walk thru all the filesystem inodes and construct a consistent view
1236  * of the disk quota world. If the quotacheck fails, disable quotas.
1237  */
1238 STATIC int
1239 xfs_qm_quotacheck(
1240 	xfs_mount_t	*mp)
1241 {
1242 	int			done, count, error, error2;
1243 	xfs_ino_t		lastino;
1244 	size_t			structsz;
1245 	uint			flags;
1246 	LIST_HEAD		(buffer_list);
1247 	struct xfs_inode	*uip = mp->m_quotainfo->qi_uquotaip;
1248 	struct xfs_inode	*gip = mp->m_quotainfo->qi_gquotaip;
1249 	struct xfs_inode	*pip = mp->m_quotainfo->qi_pquotaip;
1250 
1251 	count = INT_MAX;
1252 	structsz = 1;
1253 	lastino = 0;
1254 	flags = 0;
1255 
1256 	ASSERT(uip || gip || pip);
1257 	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1258 
1259 	xfs_notice(mp, "Quotacheck needed: Please wait.");
1260 
1261 	/*
1262 	 * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1263 	 * their counters to zero. We need a clean slate.
1264 	 * We don't log our changes till later.
1265 	 */
1266 	if (uip) {
1267 		error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1268 					 &buffer_list);
1269 		if (error)
1270 			goto error_return;
1271 		flags |= XFS_UQUOTA_CHKD;
1272 	}
1273 
1274 	if (gip) {
1275 		error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1276 					 &buffer_list);
1277 		if (error)
1278 			goto error_return;
1279 		flags |= XFS_GQUOTA_CHKD;
1280 	}
1281 
1282 	if (pip) {
1283 		error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1284 					 &buffer_list);
1285 		if (error)
1286 			goto error_return;
1287 		flags |= XFS_PQUOTA_CHKD;
1288 	}
1289 
1290 	do {
1291 		/*
1292 		 * Iterate thru all the inodes in the file system,
1293 		 * adjusting the corresponding dquot counters in core.
1294 		 */
1295 		error = xfs_bulkstat(mp, &lastino, &count,
1296 				     xfs_qm_dqusage_adjust,
1297 				     structsz, NULL, &done);
1298 		if (error)
1299 			break;
1300 
1301 	} while (!done);
1302 
1303 	/*
1304 	 * We've made all the changes that we need to make incore.  Flush them
1305 	 * down to disk buffers if everything was updated successfully.
1306 	 */
1307 	if (XFS_IS_UQUOTA_ON(mp)) {
1308 		error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1309 					  &buffer_list);
1310 	}
1311 	if (XFS_IS_GQUOTA_ON(mp)) {
1312 		error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1313 					   &buffer_list);
1314 		if (!error)
1315 			error = error2;
1316 	}
1317 	if (XFS_IS_PQUOTA_ON(mp)) {
1318 		error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1319 					   &buffer_list);
1320 		if (!error)
1321 			error = error2;
1322 	}
1323 
1324 	error2 = xfs_buf_delwri_submit(&buffer_list);
1325 	if (!error)
1326 		error = error2;
1327 
1328 	/*
1329 	 * We can get this error if we couldn't do a dquot allocation inside
1330 	 * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1331 	 * dirty dquots that might be cached, we just want to get rid of them
1332 	 * and turn quotaoff. The dquots won't be attached to any of the inodes
1333 	 * at this point (because we intentionally didn't in dqget_noattach).
1334 	 */
1335 	if (error) {
1336 		xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1337 		goto error_return;
1338 	}
1339 
1340 	/*
1341 	 * If one type of quotas is off, then it will lose its
1342 	 * quotachecked status, since we won't be doing accounting for
1343 	 * that type anymore.
1344 	 */
1345 	mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1346 	mp->m_qflags |= flags;
1347 
1348  error_return:
1349 	while (!list_empty(&buffer_list)) {
1350 		struct xfs_buf *bp =
1351 			list_first_entry(&buffer_list, struct xfs_buf, b_list);
1352 		list_del_init(&bp->b_list);
1353 		xfs_buf_relse(bp);
1354 	}
1355 
1356 	if (error) {
1357 		xfs_warn(mp,
1358 	"Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1359 			error);
1360 		/*
1361 		 * We must turn off quotas.
1362 		 */
1363 		ASSERT(mp->m_quotainfo != NULL);
1364 		xfs_qm_destroy_quotainfo(mp);
1365 		if (xfs_mount_reset_sbqflags(mp)) {
1366 			xfs_warn(mp,
1367 				"Quotacheck: Failed to reset quota flags.");
1368 		}
1369 	} else
1370 		xfs_notice(mp, "Quotacheck: Done.");
1371 	return error;
1372 }
1373 
1374 /*
1375  * This is called from xfs_mountfs to start quotas and initialize all
1376  * necessary data structures like quotainfo.  This is also responsible for
1377  * running a quotacheck as necessary.  We are guaranteed that the superblock
1378  * is consistently read in at this point.
1379  *
1380  * If we fail here, the mount will continue with quota turned off. We don't
1381  * need to inidicate success or failure at all.
1382  */
1383 void
1384 xfs_qm_mount_quotas(
1385 	struct xfs_mount	*mp)
1386 {
1387 	int			error = 0;
1388 	uint			sbf;
1389 
1390 	/*
1391 	 * If quotas on realtime volumes is not supported, we disable
1392 	 * quotas immediately.
1393 	 */
1394 	if (mp->m_sb.sb_rextents) {
1395 		xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1396 		mp->m_qflags = 0;
1397 		goto write_changes;
1398 	}
1399 
1400 	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1401 
1402 	/*
1403 	 * Allocate the quotainfo structure inside the mount struct, and
1404 	 * create quotainode(s), and change/rev superblock if necessary.
1405 	 */
1406 	error = xfs_qm_init_quotainfo(mp);
1407 	if (error) {
1408 		/*
1409 		 * We must turn off quotas.
1410 		 */
1411 		ASSERT(mp->m_quotainfo == NULL);
1412 		mp->m_qflags = 0;
1413 		goto write_changes;
1414 	}
1415 	/*
1416 	 * If any of the quotas are not consistent, do a quotacheck.
1417 	 */
1418 	if (XFS_QM_NEED_QUOTACHECK(mp)) {
1419 		error = xfs_qm_quotacheck(mp);
1420 		if (error) {
1421 			/* Quotacheck failed and disabled quotas. */
1422 			return;
1423 		}
1424 	}
1425 	/*
1426 	 * If one type of quotas is off, then it will lose its
1427 	 * quotachecked status, since we won't be doing accounting for
1428 	 * that type anymore.
1429 	 */
1430 	if (!XFS_IS_UQUOTA_ON(mp))
1431 		mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1432 	if (!XFS_IS_GQUOTA_ON(mp))
1433 		mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1434 	if (!XFS_IS_PQUOTA_ON(mp))
1435 		mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1436 
1437  write_changes:
1438 	/*
1439 	 * We actually don't have to acquire the m_sb_lock at all.
1440 	 * This can only be called from mount, and that's single threaded. XXX
1441 	 */
1442 	spin_lock(&mp->m_sb_lock);
1443 	sbf = mp->m_sb.sb_qflags;
1444 	mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1445 	spin_unlock(&mp->m_sb_lock);
1446 
1447 	if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1448 		if (xfs_sync_sb(mp, false)) {
1449 			/*
1450 			 * We could only have been turning quotas off.
1451 			 * We aren't in very good shape actually because
1452 			 * the incore structures are convinced that quotas are
1453 			 * off, but the on disk superblock doesn't know that !
1454 			 */
1455 			ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1456 			xfs_alert(mp, "%s: Superblock update failed!",
1457 				__func__);
1458 		}
1459 	}
1460 
1461 	if (error) {
1462 		xfs_warn(mp, "Failed to initialize disk quotas.");
1463 		return;
1464 	}
1465 }
1466 
1467 /*
1468  * This is called after the superblock has been read in and we're ready to
1469  * iget the quota inodes.
1470  */
1471 STATIC int
1472 xfs_qm_init_quotainos(
1473 	xfs_mount_t	*mp)
1474 {
1475 	struct xfs_inode	*uip = NULL;
1476 	struct xfs_inode	*gip = NULL;
1477 	struct xfs_inode	*pip = NULL;
1478 	int			error;
1479 	uint			flags = 0;
1480 
1481 	ASSERT(mp->m_quotainfo);
1482 
1483 	/*
1484 	 * Get the uquota and gquota inodes
1485 	 */
1486 	if (xfs_sb_version_hasquota(&mp->m_sb)) {
1487 		if (XFS_IS_UQUOTA_ON(mp) &&
1488 		    mp->m_sb.sb_uquotino != NULLFSINO) {
1489 			ASSERT(mp->m_sb.sb_uquotino > 0);
1490 			error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1491 					     0, 0, &uip);
1492 			if (error)
1493 				return error;
1494 		}
1495 		if (XFS_IS_GQUOTA_ON(mp) &&
1496 		    mp->m_sb.sb_gquotino != NULLFSINO) {
1497 			ASSERT(mp->m_sb.sb_gquotino > 0);
1498 			error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1499 					     0, 0, &gip);
1500 			if (error)
1501 				goto error_rele;
1502 		}
1503 		if (XFS_IS_PQUOTA_ON(mp) &&
1504 		    mp->m_sb.sb_pquotino != NULLFSINO) {
1505 			ASSERT(mp->m_sb.sb_pquotino > 0);
1506 			error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1507 					     0, 0, &pip);
1508 			if (error)
1509 				goto error_rele;
1510 		}
1511 	} else {
1512 		flags |= XFS_QMOPT_SBVERSION;
1513 	}
1514 
1515 	/*
1516 	 * Create the three inodes, if they don't exist already. The changes
1517 	 * made above will get added to a transaction and logged in one of
1518 	 * the qino_alloc calls below.  If the device is readonly,
1519 	 * temporarily switch to read-write to do this.
1520 	 */
1521 	if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1522 		error = xfs_qm_qino_alloc(mp, &uip,
1523 					      flags | XFS_QMOPT_UQUOTA);
1524 		if (error)
1525 			goto error_rele;
1526 
1527 		flags &= ~XFS_QMOPT_SBVERSION;
1528 	}
1529 	if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1530 		error = xfs_qm_qino_alloc(mp, &gip,
1531 					  flags | XFS_QMOPT_GQUOTA);
1532 		if (error)
1533 			goto error_rele;
1534 
1535 		flags &= ~XFS_QMOPT_SBVERSION;
1536 	}
1537 	if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1538 		error = xfs_qm_qino_alloc(mp, &pip,
1539 					  flags | XFS_QMOPT_PQUOTA);
1540 		if (error)
1541 			goto error_rele;
1542 	}
1543 
1544 	mp->m_quotainfo->qi_uquotaip = uip;
1545 	mp->m_quotainfo->qi_gquotaip = gip;
1546 	mp->m_quotainfo->qi_pquotaip = pip;
1547 
1548 	return 0;
1549 
1550 error_rele:
1551 	if (uip)
1552 		IRELE(uip);
1553 	if (gip)
1554 		IRELE(gip);
1555 	if (pip)
1556 		IRELE(pip);
1557 	return error;
1558 }
1559 
1560 STATIC void
1561 xfs_qm_dqfree_one(
1562 	struct xfs_dquot	*dqp)
1563 {
1564 	struct xfs_mount	*mp = dqp->q_mount;
1565 	struct xfs_quotainfo	*qi = mp->m_quotainfo;
1566 
1567 	mutex_lock(&qi->qi_tree_lock);
1568 	radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1569 			  be32_to_cpu(dqp->q_core.d_id));
1570 
1571 	qi->qi_dquots--;
1572 	mutex_unlock(&qi->qi_tree_lock);
1573 
1574 	xfs_qm_dqdestroy(dqp);
1575 }
1576 
1577 /* --------------- utility functions for vnodeops ---------------- */
1578 
1579 
1580 /*
1581  * Given an inode, a uid, gid and prid make sure that we have
1582  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1583  * quotas by creating this file.
1584  * This also attaches dquot(s) to the given inode after locking it,
1585  * and returns the dquots corresponding to the uid and/or gid.
1586  *
1587  * in	: inode (unlocked)
1588  * out	: udquot, gdquot with references taken and unlocked
1589  */
1590 int
1591 xfs_qm_vop_dqalloc(
1592 	struct xfs_inode	*ip,
1593 	xfs_dqid_t		uid,
1594 	xfs_dqid_t		gid,
1595 	prid_t			prid,
1596 	uint			flags,
1597 	struct xfs_dquot	**O_udqpp,
1598 	struct xfs_dquot	**O_gdqpp,
1599 	struct xfs_dquot	**O_pdqpp)
1600 {
1601 	struct xfs_mount	*mp = ip->i_mount;
1602 	struct xfs_dquot	*uq = NULL;
1603 	struct xfs_dquot	*gq = NULL;
1604 	struct xfs_dquot	*pq = NULL;
1605 	int			error;
1606 	uint			lockflags;
1607 
1608 	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1609 		return 0;
1610 
1611 	lockflags = XFS_ILOCK_EXCL;
1612 	xfs_ilock(ip, lockflags);
1613 
1614 	if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1615 		gid = ip->i_d.di_gid;
1616 
1617 	/*
1618 	 * Attach the dquot(s) to this inode, doing a dquot allocation
1619 	 * if necessary. The dquot(s) will not be locked.
1620 	 */
1621 	if (XFS_NOT_DQATTACHED(mp, ip)) {
1622 		error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1623 		if (error) {
1624 			xfs_iunlock(ip, lockflags);
1625 			return error;
1626 		}
1627 	}
1628 
1629 	if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1630 		if (ip->i_d.di_uid != uid) {
1631 			/*
1632 			 * What we need is the dquot that has this uid, and
1633 			 * if we send the inode to dqget, the uid of the inode
1634 			 * takes priority over what's sent in the uid argument.
1635 			 * We must unlock inode here before calling dqget if
1636 			 * we're not sending the inode, because otherwise
1637 			 * we'll deadlock by doing trans_reserve while
1638 			 * holding ilock.
1639 			 */
1640 			xfs_iunlock(ip, lockflags);
1641 			error = xfs_qm_dqget(mp, NULL, uid,
1642 						 XFS_DQ_USER,
1643 						 XFS_QMOPT_DQALLOC |
1644 						 XFS_QMOPT_DOWARN,
1645 						 &uq);
1646 			if (error) {
1647 				ASSERT(error != -ENOENT);
1648 				return error;
1649 			}
1650 			/*
1651 			 * Get the ilock in the right order.
1652 			 */
1653 			xfs_dqunlock(uq);
1654 			lockflags = XFS_ILOCK_SHARED;
1655 			xfs_ilock(ip, lockflags);
1656 		} else {
1657 			/*
1658 			 * Take an extra reference, because we'll return
1659 			 * this to caller
1660 			 */
1661 			ASSERT(ip->i_udquot);
1662 			uq = xfs_qm_dqhold(ip->i_udquot);
1663 		}
1664 	}
1665 	if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1666 		if (ip->i_d.di_gid != gid) {
1667 			xfs_iunlock(ip, lockflags);
1668 			error = xfs_qm_dqget(mp, NULL, gid,
1669 						 XFS_DQ_GROUP,
1670 						 XFS_QMOPT_DQALLOC |
1671 						 XFS_QMOPT_DOWARN,
1672 						 &gq);
1673 			if (error) {
1674 				ASSERT(error != -ENOENT);
1675 				goto error_rele;
1676 			}
1677 			xfs_dqunlock(gq);
1678 			lockflags = XFS_ILOCK_SHARED;
1679 			xfs_ilock(ip, lockflags);
1680 		} else {
1681 			ASSERT(ip->i_gdquot);
1682 			gq = xfs_qm_dqhold(ip->i_gdquot);
1683 		}
1684 	}
1685 	if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1686 		if (xfs_get_projid(ip) != prid) {
1687 			xfs_iunlock(ip, lockflags);
1688 			error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1689 						 XFS_DQ_PROJ,
1690 						 XFS_QMOPT_DQALLOC |
1691 						 XFS_QMOPT_DOWARN,
1692 						 &pq);
1693 			if (error) {
1694 				ASSERT(error != -ENOENT);
1695 				goto error_rele;
1696 			}
1697 			xfs_dqunlock(pq);
1698 			lockflags = XFS_ILOCK_SHARED;
1699 			xfs_ilock(ip, lockflags);
1700 		} else {
1701 			ASSERT(ip->i_pdquot);
1702 			pq = xfs_qm_dqhold(ip->i_pdquot);
1703 		}
1704 	}
1705 	if (uq)
1706 		trace_xfs_dquot_dqalloc(ip);
1707 
1708 	xfs_iunlock(ip, lockflags);
1709 	if (O_udqpp)
1710 		*O_udqpp = uq;
1711 	else
1712 		xfs_qm_dqrele(uq);
1713 	if (O_gdqpp)
1714 		*O_gdqpp = gq;
1715 	else
1716 		xfs_qm_dqrele(gq);
1717 	if (O_pdqpp)
1718 		*O_pdqpp = pq;
1719 	else
1720 		xfs_qm_dqrele(pq);
1721 	return 0;
1722 
1723 error_rele:
1724 	xfs_qm_dqrele(gq);
1725 	xfs_qm_dqrele(uq);
1726 	return error;
1727 }
1728 
1729 /*
1730  * Actually transfer ownership, and do dquot modifications.
1731  * These were already reserved.
1732  */
1733 xfs_dquot_t *
1734 xfs_qm_vop_chown(
1735 	xfs_trans_t	*tp,
1736 	xfs_inode_t	*ip,
1737 	xfs_dquot_t	**IO_olddq,
1738 	xfs_dquot_t	*newdq)
1739 {
1740 	xfs_dquot_t	*prevdq;
1741 	uint		bfield = XFS_IS_REALTIME_INODE(ip) ?
1742 				 XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1743 
1744 
1745 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1746 	ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1747 
1748 	/* old dquot */
1749 	prevdq = *IO_olddq;
1750 	ASSERT(prevdq);
1751 	ASSERT(prevdq != newdq);
1752 
1753 	xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1754 	xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1755 
1756 	/* the sparkling new dquot */
1757 	xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1758 	xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1759 
1760 	/*
1761 	 * Take an extra reference, because the inode is going to keep
1762 	 * this dquot pointer even after the trans_commit.
1763 	 */
1764 	*IO_olddq = xfs_qm_dqhold(newdq);
1765 
1766 	return prevdq;
1767 }
1768 
1769 /*
1770  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1771  */
1772 int
1773 xfs_qm_vop_chown_reserve(
1774 	struct xfs_trans	*tp,
1775 	struct xfs_inode	*ip,
1776 	struct xfs_dquot	*udqp,
1777 	struct xfs_dquot	*gdqp,
1778 	struct xfs_dquot	*pdqp,
1779 	uint			flags)
1780 {
1781 	struct xfs_mount	*mp = ip->i_mount;
1782 	uint			delblks, blkflags, prjflags = 0;
1783 	struct xfs_dquot	*udq_unres = NULL;
1784 	struct xfs_dquot	*gdq_unres = NULL;
1785 	struct xfs_dquot	*pdq_unres = NULL;
1786 	struct xfs_dquot	*udq_delblks = NULL;
1787 	struct xfs_dquot	*gdq_delblks = NULL;
1788 	struct xfs_dquot	*pdq_delblks = NULL;
1789 	int			error;
1790 
1791 
1792 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1793 	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1794 
1795 	delblks = ip->i_delayed_blks;
1796 	blkflags = XFS_IS_REALTIME_INODE(ip) ?
1797 			XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1798 
1799 	if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1800 	    ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1801 		udq_delblks = udqp;
1802 		/*
1803 		 * If there are delayed allocation blocks, then we have to
1804 		 * unreserve those from the old dquot, and add them to the
1805 		 * new dquot.
1806 		 */
1807 		if (delblks) {
1808 			ASSERT(ip->i_udquot);
1809 			udq_unres = ip->i_udquot;
1810 		}
1811 	}
1812 	if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1813 	    ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1814 		gdq_delblks = gdqp;
1815 		if (delblks) {
1816 			ASSERT(ip->i_gdquot);
1817 			gdq_unres = ip->i_gdquot;
1818 		}
1819 	}
1820 
1821 	if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1822 	    xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1823 		prjflags = XFS_QMOPT_ENOSPC;
1824 		pdq_delblks = pdqp;
1825 		if (delblks) {
1826 			ASSERT(ip->i_pdquot);
1827 			pdq_unres = ip->i_pdquot;
1828 		}
1829 	}
1830 
1831 	error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1832 				udq_delblks, gdq_delblks, pdq_delblks,
1833 				ip->i_d.di_nblocks, 1,
1834 				flags | blkflags | prjflags);
1835 	if (error)
1836 		return error;
1837 
1838 	/*
1839 	 * Do the delayed blks reservations/unreservations now. Since, these
1840 	 * are done without the help of a transaction, if a reservation fails
1841 	 * its previous reservations won't be automatically undone by trans
1842 	 * code. So, we have to do it manually here.
1843 	 */
1844 	if (delblks) {
1845 		/*
1846 		 * Do the reservations first. Unreservation can't fail.
1847 		 */
1848 		ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1849 		ASSERT(udq_unres || gdq_unres || pdq_unres);
1850 		error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1851 			    udq_delblks, gdq_delblks, pdq_delblks,
1852 			    (xfs_qcnt_t)delblks, 0,
1853 			    flags | blkflags | prjflags);
1854 		if (error)
1855 			return error;
1856 		xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1857 				udq_unres, gdq_unres, pdq_unres,
1858 				-((xfs_qcnt_t)delblks), 0, blkflags);
1859 	}
1860 
1861 	return 0;
1862 }
1863 
1864 int
1865 xfs_qm_vop_rename_dqattach(
1866 	struct xfs_inode	**i_tab)
1867 {
1868 	struct xfs_mount	*mp = i_tab[0]->i_mount;
1869 	int			i;
1870 
1871 	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1872 		return 0;
1873 
1874 	for (i = 0; (i < 4 && i_tab[i]); i++) {
1875 		struct xfs_inode	*ip = i_tab[i];
1876 		int			error;
1877 
1878 		/*
1879 		 * Watch out for duplicate entries in the table.
1880 		 */
1881 		if (i == 0 || ip != i_tab[i-1]) {
1882 			if (XFS_NOT_DQATTACHED(mp, ip)) {
1883 				error = xfs_qm_dqattach(ip, 0);
1884 				if (error)
1885 					return error;
1886 			}
1887 		}
1888 	}
1889 	return 0;
1890 }
1891 
1892 void
1893 xfs_qm_vop_create_dqattach(
1894 	struct xfs_trans	*tp,
1895 	struct xfs_inode	*ip,
1896 	struct xfs_dquot	*udqp,
1897 	struct xfs_dquot	*gdqp,
1898 	struct xfs_dquot	*pdqp)
1899 {
1900 	struct xfs_mount	*mp = tp->t_mountp;
1901 
1902 	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1903 		return;
1904 
1905 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1906 	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1907 
1908 	if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1909 		ASSERT(ip->i_udquot == NULL);
1910 		ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1911 
1912 		ip->i_udquot = xfs_qm_dqhold(udqp);
1913 		xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1914 	}
1915 	if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1916 		ASSERT(ip->i_gdquot == NULL);
1917 		ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1918 		ip->i_gdquot = xfs_qm_dqhold(gdqp);
1919 		xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1920 	}
1921 	if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1922 		ASSERT(ip->i_pdquot == NULL);
1923 		ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1924 
1925 		ip->i_pdquot = xfs_qm_dqhold(pdqp);
1926 		xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1927 	}
1928 }
1929 
1930