xref: /openbmc/linux/fs/xfs/xfs_qm.c (revision 6774def6)
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_ag.h"
27 #include "xfs_mount.h"
28 #include "xfs_inode.h"
29 #include "xfs_ialloc.h"
30 #include "xfs_itable.h"
31 #include "xfs_quota.h"
32 #include "xfs_error.h"
33 #include "xfs_bmap.h"
34 #include "xfs_bmap_btree.h"
35 #include "xfs_trans.h"
36 #include "xfs_trans_space.h"
37 #include "xfs_qm.h"
38 #include "xfs_trace.h"
39 #include "xfs_icache.h"
40 #include "xfs_cksum.h"
41 #include "xfs_dinode.h"
42 
43 /*
44  * The global quota manager. There is only one of these for the entire
45  * system, _not_ one per file system. XQM keeps track of the overall
46  * quota functionality, including maintaining the freelist and hash
47  * tables of dquots.
48  */
49 STATIC int	xfs_qm_init_quotainos(xfs_mount_t *);
50 STATIC int	xfs_qm_init_quotainfo(xfs_mount_t *);
51 
52 
53 STATIC void	xfs_qm_dqfree_one(struct xfs_dquot *dqp);
54 /*
55  * We use the batch lookup interface to iterate over the dquots as it
56  * currently is the only interface into the radix tree code that allows
57  * fuzzy lookups instead of exact matches.  Holding the lock over multiple
58  * operations is fine as all callers are used either during mount/umount
59  * or quotaoff.
60  */
61 #define XFS_DQ_LOOKUP_BATCH	32
62 
63 STATIC int
64 xfs_qm_dquot_walk(
65 	struct xfs_mount	*mp,
66 	int			type,
67 	int			(*execute)(struct xfs_dquot *dqp, void *data),
68 	void			*data)
69 {
70 	struct xfs_quotainfo	*qi = mp->m_quotainfo;
71 	struct radix_tree_root	*tree = xfs_dquot_tree(qi, type);
72 	uint32_t		next_index;
73 	int			last_error = 0;
74 	int			skipped;
75 	int			nr_found;
76 
77 restart:
78 	skipped = 0;
79 	next_index = 0;
80 	nr_found = 0;
81 
82 	while (1) {
83 		struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
84 		int		error = 0;
85 		int		i;
86 
87 		mutex_lock(&qi->qi_tree_lock);
88 		nr_found = radix_tree_gang_lookup(tree, (void **)batch,
89 					next_index, XFS_DQ_LOOKUP_BATCH);
90 		if (!nr_found) {
91 			mutex_unlock(&qi->qi_tree_lock);
92 			break;
93 		}
94 
95 		for (i = 0; i < nr_found; i++) {
96 			struct xfs_dquot *dqp = batch[i];
97 
98 			next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
99 
100 			error = execute(batch[i], data);
101 			if (error == -EAGAIN) {
102 				skipped++;
103 				continue;
104 			}
105 			if (error && last_error != -EFSCORRUPTED)
106 				last_error = error;
107 		}
108 
109 		mutex_unlock(&qi->qi_tree_lock);
110 
111 		/* bail out if the filesystem is corrupted.  */
112 		if (last_error == -EFSCORRUPTED) {
113 			skipped = 0;
114 			break;
115 		}
116 	}
117 
118 	if (skipped) {
119 		delay(1);
120 		goto restart;
121 	}
122 
123 	return last_error;
124 }
125 
126 
127 /*
128  * Purge a dquot from all tracking data structures and free it.
129  */
130 STATIC int
131 xfs_qm_dqpurge(
132 	struct xfs_dquot	*dqp,
133 	void			*data)
134 {
135 	struct xfs_mount	*mp = dqp->q_mount;
136 	struct xfs_quotainfo	*qi = mp->m_quotainfo;
137 
138 	xfs_dqlock(dqp);
139 	if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
140 		xfs_dqunlock(dqp);
141 		return -EAGAIN;
142 	}
143 
144 	dqp->dq_flags |= XFS_DQ_FREEING;
145 
146 	xfs_dqflock(dqp);
147 
148 	/*
149 	 * If we are turning this type of quotas off, we don't care
150 	 * about the dirty metadata sitting in this dquot. OTOH, if
151 	 * we're unmounting, we do care, so we flush it and wait.
152 	 */
153 	if (XFS_DQ_IS_DIRTY(dqp)) {
154 		struct xfs_buf	*bp = NULL;
155 		int		error;
156 
157 		/*
158 		 * We don't care about getting disk errors here. We need
159 		 * to purge this dquot anyway, so we go ahead regardless.
160 		 */
161 		error = xfs_qm_dqflush(dqp, &bp);
162 		if (error) {
163 			xfs_warn(mp, "%s: dquot %p flush failed",
164 				__func__, dqp);
165 		} else {
166 			error = xfs_bwrite(bp);
167 			xfs_buf_relse(bp);
168 		}
169 		xfs_dqflock(dqp);
170 	}
171 
172 	ASSERT(atomic_read(&dqp->q_pincount) == 0);
173 	ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
174 	       !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
175 
176 	xfs_dqfunlock(dqp);
177 	xfs_dqunlock(dqp);
178 
179 	radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
180 			  be32_to_cpu(dqp->q_core.d_id));
181 	qi->qi_dquots--;
182 
183 	/*
184 	 * We move dquots to the freelist as soon as their reference count
185 	 * hits zero, so it really should be on the freelist here.
186 	 */
187 	ASSERT(!list_empty(&dqp->q_lru));
188 	list_lru_del(&qi->qi_lru, &dqp->q_lru);
189 	XFS_STATS_DEC(xs_qm_dquot_unused);
190 
191 	xfs_qm_dqdestroy(dqp);
192 	return 0;
193 }
194 
195 /*
196  * Purge the dquot cache.
197  */
198 void
199 xfs_qm_dqpurge_all(
200 	struct xfs_mount	*mp,
201 	uint			flags)
202 {
203 	if (flags & XFS_QMOPT_UQUOTA)
204 		xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
205 	if (flags & XFS_QMOPT_GQUOTA)
206 		xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
207 	if (flags & XFS_QMOPT_PQUOTA)
208 		xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
209 }
210 
211 /*
212  * Just destroy the quotainfo structure.
213  */
214 void
215 xfs_qm_unmount(
216 	struct xfs_mount	*mp)
217 {
218 	if (mp->m_quotainfo) {
219 		xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
220 		xfs_qm_destroy_quotainfo(mp);
221 	}
222 }
223 
224 /*
225  * Called from the vfsops layer.
226  */
227 void
228 xfs_qm_unmount_quotas(
229 	xfs_mount_t	*mp)
230 {
231 	/*
232 	 * Release the dquots that root inode, et al might be holding,
233 	 * before we flush quotas and blow away the quotainfo structure.
234 	 */
235 	ASSERT(mp->m_rootip);
236 	xfs_qm_dqdetach(mp->m_rootip);
237 	if (mp->m_rbmip)
238 		xfs_qm_dqdetach(mp->m_rbmip);
239 	if (mp->m_rsumip)
240 		xfs_qm_dqdetach(mp->m_rsumip);
241 
242 	/*
243 	 * Release the quota inodes.
244 	 */
245 	if (mp->m_quotainfo) {
246 		if (mp->m_quotainfo->qi_uquotaip) {
247 			IRELE(mp->m_quotainfo->qi_uquotaip);
248 			mp->m_quotainfo->qi_uquotaip = NULL;
249 		}
250 		if (mp->m_quotainfo->qi_gquotaip) {
251 			IRELE(mp->m_quotainfo->qi_gquotaip);
252 			mp->m_quotainfo->qi_gquotaip = NULL;
253 		}
254 		if (mp->m_quotainfo->qi_pquotaip) {
255 			IRELE(mp->m_quotainfo->qi_pquotaip);
256 			mp->m_quotainfo->qi_pquotaip = NULL;
257 		}
258 	}
259 }
260 
261 STATIC int
262 xfs_qm_dqattach_one(
263 	xfs_inode_t	*ip,
264 	xfs_dqid_t	id,
265 	uint		type,
266 	uint		doalloc,
267 	xfs_dquot_t	**IO_idqpp)
268 {
269 	xfs_dquot_t	*dqp;
270 	int		error;
271 
272 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
273 	error = 0;
274 
275 	/*
276 	 * See if we already have it in the inode itself. IO_idqpp is &i_udquot
277 	 * or &i_gdquot. This made the code look weird, but made the logic a lot
278 	 * simpler.
279 	 */
280 	dqp = *IO_idqpp;
281 	if (dqp) {
282 		trace_xfs_dqattach_found(dqp);
283 		return 0;
284 	}
285 
286 	/*
287 	 * Find the dquot from somewhere. This bumps the reference count of
288 	 * dquot and returns it locked.  This can return ENOENT if dquot didn't
289 	 * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
290 	 * turned off suddenly.
291 	 */
292 	error = xfs_qm_dqget(ip->i_mount, ip, id, type,
293 			     doalloc | XFS_QMOPT_DOWARN, &dqp);
294 	if (error)
295 		return error;
296 
297 	trace_xfs_dqattach_get(dqp);
298 
299 	/*
300 	 * dqget may have dropped and re-acquired the ilock, but it guarantees
301 	 * that the dquot returned is the one that should go in the inode.
302 	 */
303 	*IO_idqpp = dqp;
304 	xfs_dqunlock(dqp);
305 	return 0;
306 }
307 
308 static bool
309 xfs_qm_need_dqattach(
310 	struct xfs_inode	*ip)
311 {
312 	struct xfs_mount	*mp = ip->i_mount;
313 
314 	if (!XFS_IS_QUOTA_RUNNING(mp))
315 		return false;
316 	if (!XFS_IS_QUOTA_ON(mp))
317 		return false;
318 	if (!XFS_NOT_DQATTACHED(mp, ip))
319 		return false;
320 	if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
321 		return false;
322 	return true;
323 }
324 
325 /*
326  * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
327  * into account.
328  * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
329  * Inode may get unlocked and relocked in here, and the caller must deal with
330  * the consequences.
331  */
332 int
333 xfs_qm_dqattach_locked(
334 	xfs_inode_t	*ip,
335 	uint		flags)
336 {
337 	xfs_mount_t	*mp = ip->i_mount;
338 	int		error = 0;
339 
340 	if (!xfs_qm_need_dqattach(ip))
341 		return 0;
342 
343 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
344 
345 	if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
346 		error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
347 						flags & XFS_QMOPT_DQALLOC,
348 						&ip->i_udquot);
349 		if (error)
350 			goto done;
351 		ASSERT(ip->i_udquot);
352 	}
353 
354 	if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
355 		error = xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
356 						flags & XFS_QMOPT_DQALLOC,
357 						&ip->i_gdquot);
358 		if (error)
359 			goto done;
360 		ASSERT(ip->i_gdquot);
361 	}
362 
363 	if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
364 		error = xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
365 						flags & XFS_QMOPT_DQALLOC,
366 						&ip->i_pdquot);
367 		if (error)
368 			goto done;
369 		ASSERT(ip->i_pdquot);
370 	}
371 
372 done:
373 	/*
374 	 * Don't worry about the dquots that we may have attached before any
375 	 * error - they'll get detached later if it has not already been done.
376 	 */
377 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
378 	return error;
379 }
380 
381 int
382 xfs_qm_dqattach(
383 	struct xfs_inode	*ip,
384 	uint			flags)
385 {
386 	int			error;
387 
388 	if (!xfs_qm_need_dqattach(ip))
389 		return 0;
390 
391 	xfs_ilock(ip, XFS_ILOCK_EXCL);
392 	error = xfs_qm_dqattach_locked(ip, flags);
393 	xfs_iunlock(ip, XFS_ILOCK_EXCL);
394 
395 	return error;
396 }
397 
398 /*
399  * Release dquots (and their references) if any.
400  * The inode should be locked EXCL except when this's called by
401  * xfs_ireclaim.
402  */
403 void
404 xfs_qm_dqdetach(
405 	xfs_inode_t	*ip)
406 {
407 	if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
408 		return;
409 
410 	trace_xfs_dquot_dqdetach(ip);
411 
412 	ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
413 	if (ip->i_udquot) {
414 		xfs_qm_dqrele(ip->i_udquot);
415 		ip->i_udquot = NULL;
416 	}
417 	if (ip->i_gdquot) {
418 		xfs_qm_dqrele(ip->i_gdquot);
419 		ip->i_gdquot = NULL;
420 	}
421 	if (ip->i_pdquot) {
422 		xfs_qm_dqrele(ip->i_pdquot);
423 		ip->i_pdquot = NULL;
424 	}
425 }
426 
427 struct xfs_qm_isolate {
428 	struct list_head	buffers;
429 	struct list_head	dispose;
430 };
431 
432 static enum lru_status
433 xfs_qm_dquot_isolate(
434 	struct list_head	*item,
435 	spinlock_t		*lru_lock,
436 	void			*arg)
437 		__releases(lru_lock) __acquires(lru_lock)
438 {
439 	struct xfs_dquot	*dqp = container_of(item,
440 						struct xfs_dquot, q_lru);
441 	struct xfs_qm_isolate	*isol = arg;
442 
443 	if (!xfs_dqlock_nowait(dqp))
444 		goto out_miss_busy;
445 
446 	/*
447 	 * This dquot has acquired a reference in the meantime remove it from
448 	 * the freelist and try again.
449 	 */
450 	if (dqp->q_nrefs) {
451 		xfs_dqunlock(dqp);
452 		XFS_STATS_INC(xs_qm_dqwants);
453 
454 		trace_xfs_dqreclaim_want(dqp);
455 		list_del_init(&dqp->q_lru);
456 		XFS_STATS_DEC(xs_qm_dquot_unused);
457 		return LRU_REMOVED;
458 	}
459 
460 	/*
461 	 * If the dquot is dirty, flush it. If it's already being flushed, just
462 	 * skip it so there is time for the IO to complete before we try to
463 	 * reclaim it again on the next LRU pass.
464 	 */
465 	if (!xfs_dqflock_nowait(dqp)) {
466 		xfs_dqunlock(dqp);
467 		goto out_miss_busy;
468 	}
469 
470 	if (XFS_DQ_IS_DIRTY(dqp)) {
471 		struct xfs_buf	*bp = NULL;
472 		int		error;
473 
474 		trace_xfs_dqreclaim_dirty(dqp);
475 
476 		/* we have to drop the LRU lock to flush the dquot */
477 		spin_unlock(lru_lock);
478 
479 		error = xfs_qm_dqflush(dqp, &bp);
480 		if (error) {
481 			xfs_warn(dqp->q_mount, "%s: dquot %p flush failed",
482 				 __func__, dqp);
483 			goto out_unlock_dirty;
484 		}
485 
486 		xfs_buf_delwri_queue(bp, &isol->buffers);
487 		xfs_buf_relse(bp);
488 		goto out_unlock_dirty;
489 	}
490 	xfs_dqfunlock(dqp);
491 
492 	/*
493 	 * Prevent lookups now that we are past the point of no return.
494 	 */
495 	dqp->dq_flags |= XFS_DQ_FREEING;
496 	xfs_dqunlock(dqp);
497 
498 	ASSERT(dqp->q_nrefs == 0);
499 	list_move_tail(&dqp->q_lru, &isol->dispose);
500 	XFS_STATS_DEC(xs_qm_dquot_unused);
501 	trace_xfs_dqreclaim_done(dqp);
502 	XFS_STATS_INC(xs_qm_dqreclaims);
503 	return LRU_REMOVED;
504 
505 out_miss_busy:
506 	trace_xfs_dqreclaim_busy(dqp);
507 	XFS_STATS_INC(xs_qm_dqreclaim_misses);
508 	return LRU_SKIP;
509 
510 out_unlock_dirty:
511 	trace_xfs_dqreclaim_busy(dqp);
512 	XFS_STATS_INC(xs_qm_dqreclaim_misses);
513 	xfs_dqunlock(dqp);
514 	spin_lock(lru_lock);
515 	return LRU_RETRY;
516 }
517 
518 static unsigned long
519 xfs_qm_shrink_scan(
520 	struct shrinker		*shrink,
521 	struct shrink_control	*sc)
522 {
523 	struct xfs_quotainfo	*qi = container_of(shrink,
524 					struct xfs_quotainfo, qi_shrinker);
525 	struct xfs_qm_isolate	isol;
526 	unsigned long		freed;
527 	int			error;
528 	unsigned long		nr_to_scan = sc->nr_to_scan;
529 
530 	if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
531 		return 0;
532 
533 	INIT_LIST_HEAD(&isol.buffers);
534 	INIT_LIST_HEAD(&isol.dispose);
535 
536 	freed = list_lru_walk_node(&qi->qi_lru, sc->nid, xfs_qm_dquot_isolate, &isol,
537 					&nr_to_scan);
538 
539 	error = xfs_buf_delwri_submit(&isol.buffers);
540 	if (error)
541 		xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
542 
543 	while (!list_empty(&isol.dispose)) {
544 		struct xfs_dquot	*dqp;
545 
546 		dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
547 		list_del_init(&dqp->q_lru);
548 		xfs_qm_dqfree_one(dqp);
549 	}
550 
551 	return freed;
552 }
553 
554 static unsigned long
555 xfs_qm_shrink_count(
556 	struct shrinker		*shrink,
557 	struct shrink_control	*sc)
558 {
559 	struct xfs_quotainfo	*qi = container_of(shrink,
560 					struct xfs_quotainfo, qi_shrinker);
561 
562 	return list_lru_count_node(&qi->qi_lru, sc->nid);
563 }
564 
565 /*
566  * This initializes all the quota information that's kept in the
567  * mount structure
568  */
569 STATIC int
570 xfs_qm_init_quotainfo(
571 	xfs_mount_t	*mp)
572 {
573 	xfs_quotainfo_t *qinf;
574 	int		error;
575 	xfs_dquot_t	*dqp;
576 
577 	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
578 
579 	qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
580 
581 	error = list_lru_init(&qinf->qi_lru);
582 	if (error)
583 		goto out_free_qinf;
584 
585 	/*
586 	 * See if quotainodes are setup, and if not, allocate them,
587 	 * and change the superblock accordingly.
588 	 */
589 	error = xfs_qm_init_quotainos(mp);
590 	if (error)
591 		goto out_free_lru;
592 
593 	INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
594 	INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
595 	INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
596 	mutex_init(&qinf->qi_tree_lock);
597 
598 	/* mutex used to serialize quotaoffs */
599 	mutex_init(&qinf->qi_quotaofflock);
600 
601 	/* Precalc some constants */
602 	qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
603 	qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
604 
605 	mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
606 
607 	/*
608 	 * We try to get the limits from the superuser's limits fields.
609 	 * This is quite hacky, but it is standard quota practice.
610 	 *
611 	 * We look at the USR dquot with id == 0 first, but if user quotas
612 	 * are not enabled we goto the GRP dquot with id == 0.
613 	 * We don't really care to keep separate default limits for user
614 	 * and group quotas, at least not at this point.
615 	 *
616 	 * Since we may not have done a quotacheck by this point, just read
617 	 * the dquot without attaching it to any hashtables or lists.
618 	 */
619 	error = xfs_qm_dqread(mp, 0,
620 			XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
621 			 (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
622 			  XFS_DQ_PROJ),
623 			XFS_QMOPT_DOWARN, &dqp);
624 	if (!error) {
625 		xfs_disk_dquot_t	*ddqp = &dqp->q_core;
626 
627 		/*
628 		 * The warnings and timers set the grace period given to
629 		 * a user or group before he or she can not perform any
630 		 * more writing. If it is zero, a default is used.
631 		 */
632 		qinf->qi_btimelimit = ddqp->d_btimer ?
633 			be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
634 		qinf->qi_itimelimit = ddqp->d_itimer ?
635 			be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
636 		qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
637 			be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
638 		qinf->qi_bwarnlimit = ddqp->d_bwarns ?
639 			be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
640 		qinf->qi_iwarnlimit = ddqp->d_iwarns ?
641 			be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
642 		qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
643 			be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
644 		qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
645 		qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
646 		qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
647 		qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
648 		qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
649 		qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
650 
651 		xfs_qm_dqdestroy(dqp);
652 	} else {
653 		qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
654 		qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
655 		qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
656 		qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
657 		qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
658 		qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
659 	}
660 
661 	qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
662 	qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
663 	qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
664 	qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
665 	register_shrinker(&qinf->qi_shrinker);
666 	return 0;
667 
668 out_free_lru:
669 	list_lru_destroy(&qinf->qi_lru);
670 out_free_qinf:
671 	kmem_free(qinf);
672 	mp->m_quotainfo = NULL;
673 	return error;
674 }
675 
676 
677 /*
678  * Gets called when unmounting a filesystem or when all quotas get
679  * turned off.
680  * This purges the quota inodes, destroys locks and frees itself.
681  */
682 void
683 xfs_qm_destroy_quotainfo(
684 	xfs_mount_t	*mp)
685 {
686 	xfs_quotainfo_t *qi;
687 
688 	qi = mp->m_quotainfo;
689 	ASSERT(qi != NULL);
690 
691 	unregister_shrinker(&qi->qi_shrinker);
692 	list_lru_destroy(&qi->qi_lru);
693 
694 	if (qi->qi_uquotaip) {
695 		IRELE(qi->qi_uquotaip);
696 		qi->qi_uquotaip = NULL; /* paranoia */
697 	}
698 	if (qi->qi_gquotaip) {
699 		IRELE(qi->qi_gquotaip);
700 		qi->qi_gquotaip = NULL;
701 	}
702 	if (qi->qi_pquotaip) {
703 		IRELE(qi->qi_pquotaip);
704 		qi->qi_pquotaip = NULL;
705 	}
706 	mutex_destroy(&qi->qi_quotaofflock);
707 	kmem_free(qi);
708 	mp->m_quotainfo = NULL;
709 }
710 
711 /*
712  * Create an inode and return with a reference already taken, but unlocked
713  * This is how we create quota inodes
714  */
715 STATIC int
716 xfs_qm_qino_alloc(
717 	xfs_mount_t	*mp,
718 	xfs_inode_t	**ip,
719 	__int64_t	sbfields,
720 	uint		flags)
721 {
722 	xfs_trans_t	*tp;
723 	int		error;
724 	int		committed;
725 
726 	*ip = NULL;
727 	/*
728 	 * With superblock that doesn't have separate pquotino, we
729 	 * share an inode between gquota and pquota. If the on-disk
730 	 * superblock has GQUOTA and the filesystem is now mounted
731 	 * with PQUOTA, just use sb_gquotino for sb_pquotino and
732 	 * vice-versa.
733 	 */
734 	if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
735 			(flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
736 		xfs_ino_t ino = NULLFSINO;
737 
738 		if ((flags & XFS_QMOPT_PQUOTA) &&
739 			     (mp->m_sb.sb_gquotino != NULLFSINO)) {
740 			ino = mp->m_sb.sb_gquotino;
741 			ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
742 		} else if ((flags & XFS_QMOPT_GQUOTA) &&
743 			     (mp->m_sb.sb_pquotino != NULLFSINO)) {
744 			ino = mp->m_sb.sb_pquotino;
745 			ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
746 		}
747 		if (ino != NULLFSINO) {
748 			error = xfs_iget(mp, NULL, ino, 0, 0, ip);
749 			if (error)
750 				return error;
751 			mp->m_sb.sb_gquotino = NULLFSINO;
752 			mp->m_sb.sb_pquotino = NULLFSINO;
753 		}
754 	}
755 
756 	tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
757 	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_create,
758 				  XFS_QM_QINOCREATE_SPACE_RES(mp), 0);
759 	if (error) {
760 		xfs_trans_cancel(tp, 0);
761 		return error;
762 	}
763 
764 	if (!*ip) {
765 		error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
766 								&committed);
767 		if (error) {
768 			xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
769 					 XFS_TRANS_ABORT);
770 			return error;
771 		}
772 	}
773 
774 	/*
775 	 * Make the changes in the superblock, and log those too.
776 	 * sbfields arg may contain fields other than *QUOTINO;
777 	 * VERSIONNUM for example.
778 	 */
779 	spin_lock(&mp->m_sb_lock);
780 	if (flags & XFS_QMOPT_SBVERSION) {
781 		ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
782 		ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
783 			XFS_SB_GQUOTINO | XFS_SB_PQUOTINO | XFS_SB_QFLAGS)) ==
784 				(XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
785 				 XFS_SB_GQUOTINO | XFS_SB_PQUOTINO |
786 				 XFS_SB_QFLAGS));
787 
788 		xfs_sb_version_addquota(&mp->m_sb);
789 		mp->m_sb.sb_uquotino = NULLFSINO;
790 		mp->m_sb.sb_gquotino = NULLFSINO;
791 		mp->m_sb.sb_pquotino = NULLFSINO;
792 
793 		/* qflags will get updated fully _after_ quotacheck */
794 		mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
795 	}
796 	if (flags & XFS_QMOPT_UQUOTA)
797 		mp->m_sb.sb_uquotino = (*ip)->i_ino;
798 	else if (flags & XFS_QMOPT_GQUOTA)
799 		mp->m_sb.sb_gquotino = (*ip)->i_ino;
800 	else
801 		mp->m_sb.sb_pquotino = (*ip)->i_ino;
802 	spin_unlock(&mp->m_sb_lock);
803 	xfs_mod_sb(tp, sbfields);
804 
805 	if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
806 		xfs_alert(mp, "%s failed (error %d)!", __func__, error);
807 		return error;
808 	}
809 	return 0;
810 }
811 
812 
813 STATIC void
814 xfs_qm_reset_dqcounts(
815 	xfs_mount_t	*mp,
816 	xfs_buf_t	*bp,
817 	xfs_dqid_t	id,
818 	uint		type)
819 {
820 	struct xfs_dqblk	*dqb;
821 	int			j;
822 
823 	trace_xfs_reset_dqcounts(bp, _RET_IP_);
824 
825 	/*
826 	 * Reset all counters and timers. They'll be
827 	 * started afresh by xfs_qm_quotacheck.
828 	 */
829 #ifdef DEBUG
830 	j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
831 	do_div(j, sizeof(xfs_dqblk_t));
832 	ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
833 #endif
834 	dqb = bp->b_addr;
835 	for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
836 		struct xfs_disk_dquot	*ddq;
837 
838 		ddq = (struct xfs_disk_dquot *)&dqb[j];
839 
840 		/*
841 		 * Do a sanity check, and if needed, repair the dqblk. Don't
842 		 * output any warnings because it's perfectly possible to
843 		 * find uninitialised dquot blks. See comment in xfs_dqcheck.
844 		 */
845 		xfs_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
846 			    "xfs_quotacheck");
847 		ddq->d_bcount = 0;
848 		ddq->d_icount = 0;
849 		ddq->d_rtbcount = 0;
850 		ddq->d_btimer = 0;
851 		ddq->d_itimer = 0;
852 		ddq->d_rtbtimer = 0;
853 		ddq->d_bwarns = 0;
854 		ddq->d_iwarns = 0;
855 		ddq->d_rtbwarns = 0;
856 
857 		if (xfs_sb_version_hascrc(&mp->m_sb)) {
858 			xfs_update_cksum((char *)&dqb[j],
859 					 sizeof(struct xfs_dqblk),
860 					 XFS_DQUOT_CRC_OFF);
861 		}
862 	}
863 }
864 
865 STATIC int
866 xfs_qm_dqiter_bufs(
867 	struct xfs_mount	*mp,
868 	xfs_dqid_t		firstid,
869 	xfs_fsblock_t		bno,
870 	xfs_filblks_t		blkcnt,
871 	uint			flags,
872 	struct list_head	*buffer_list)
873 {
874 	struct xfs_buf		*bp;
875 	int			error;
876 	int			type;
877 
878 	ASSERT(blkcnt > 0);
879 	type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
880 		(flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
881 	error = 0;
882 
883 	/*
884 	 * Blkcnt arg can be a very big number, and might even be
885 	 * larger than the log itself. So, we have to break it up into
886 	 * manageable-sized transactions.
887 	 * Note that we don't start a permanent transaction here; we might
888 	 * not be able to get a log reservation for the whole thing up front,
889 	 * and we don't really care to either, because we just discard
890 	 * everything if we were to crash in the middle of this loop.
891 	 */
892 	while (blkcnt--) {
893 		error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
894 			      XFS_FSB_TO_DADDR(mp, bno),
895 			      mp->m_quotainfo->qi_dqchunklen, 0, &bp,
896 			      &xfs_dquot_buf_ops);
897 
898 		/*
899 		 * CRC and validation errors will return a EFSCORRUPTED here. If
900 		 * this occurs, re-read without CRC validation so that we can
901 		 * repair the damage via xfs_qm_reset_dqcounts(). This process
902 		 * will leave a trace in the log indicating corruption has
903 		 * been detected.
904 		 */
905 		if (error == -EFSCORRUPTED) {
906 			error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
907 				      XFS_FSB_TO_DADDR(mp, bno),
908 				      mp->m_quotainfo->qi_dqchunklen, 0, &bp,
909 				      NULL);
910 		}
911 
912 		if (error)
913 			break;
914 
915 		/*
916 		 * A corrupt buffer might not have a verifier attached, so
917 		 * make sure we have the correct one attached before writeback
918 		 * occurs.
919 		 */
920 		bp->b_ops = &xfs_dquot_buf_ops;
921 		xfs_qm_reset_dqcounts(mp, bp, firstid, type);
922 		xfs_buf_delwri_queue(bp, buffer_list);
923 		xfs_buf_relse(bp);
924 
925 		/* goto the next block. */
926 		bno++;
927 		firstid += mp->m_quotainfo->qi_dqperchunk;
928 	}
929 
930 	return error;
931 }
932 
933 /*
934  * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
935  * caller supplied function for every chunk of dquots that we find.
936  */
937 STATIC int
938 xfs_qm_dqiterate(
939 	struct xfs_mount	*mp,
940 	struct xfs_inode	*qip,
941 	uint			flags,
942 	struct list_head	*buffer_list)
943 {
944 	struct xfs_bmbt_irec	*map;
945 	int			i, nmaps;	/* number of map entries */
946 	int			error;		/* return value */
947 	xfs_fileoff_t		lblkno;
948 	xfs_filblks_t		maxlblkcnt;
949 	xfs_dqid_t		firstid;
950 	xfs_fsblock_t		rablkno;
951 	xfs_filblks_t		rablkcnt;
952 
953 	error = 0;
954 	/*
955 	 * This looks racy, but we can't keep an inode lock across a
956 	 * trans_reserve. But, this gets called during quotacheck, and that
957 	 * happens only at mount time which is single threaded.
958 	 */
959 	if (qip->i_d.di_nblocks == 0)
960 		return 0;
961 
962 	map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
963 
964 	lblkno = 0;
965 	maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
966 	do {
967 		uint		lock_mode;
968 
969 		nmaps = XFS_DQITER_MAP_SIZE;
970 		/*
971 		 * We aren't changing the inode itself. Just changing
972 		 * some of its data. No new blocks are added here, and
973 		 * the inode is never added to the transaction.
974 		 */
975 		lock_mode = xfs_ilock_data_map_shared(qip);
976 		error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
977 				       map, &nmaps, 0);
978 		xfs_iunlock(qip, lock_mode);
979 		if (error)
980 			break;
981 
982 		ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
983 		for (i = 0; i < nmaps; i++) {
984 			ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
985 			ASSERT(map[i].br_blockcount);
986 
987 
988 			lblkno += map[i].br_blockcount;
989 
990 			if (map[i].br_startblock == HOLESTARTBLOCK)
991 				continue;
992 
993 			firstid = (xfs_dqid_t) map[i].br_startoff *
994 				mp->m_quotainfo->qi_dqperchunk;
995 			/*
996 			 * Do a read-ahead on the next extent.
997 			 */
998 			if ((i+1 < nmaps) &&
999 			    (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1000 				rablkcnt =  map[i+1].br_blockcount;
1001 				rablkno = map[i+1].br_startblock;
1002 				while (rablkcnt--) {
1003 					xfs_buf_readahead(mp->m_ddev_targp,
1004 					       XFS_FSB_TO_DADDR(mp, rablkno),
1005 					       mp->m_quotainfo->qi_dqchunklen,
1006 					       &xfs_dquot_buf_ops);
1007 					rablkno++;
1008 				}
1009 			}
1010 			/*
1011 			 * Iterate thru all the blks in the extent and
1012 			 * reset the counters of all the dquots inside them.
1013 			 */
1014 			error = xfs_qm_dqiter_bufs(mp, firstid,
1015 						   map[i].br_startblock,
1016 						   map[i].br_blockcount,
1017 						   flags, buffer_list);
1018 			if (error)
1019 				goto out;
1020 		}
1021 	} while (nmaps > 0);
1022 
1023 out:
1024 	kmem_free(map);
1025 	return error;
1026 }
1027 
1028 /*
1029  * Called by dqusage_adjust in doing a quotacheck.
1030  *
1031  * Given the inode, and a dquot id this updates both the incore dqout as well
1032  * as the buffer copy. This is so that once the quotacheck is done, we can
1033  * just log all the buffers, as opposed to logging numerous updates to
1034  * individual dquots.
1035  */
1036 STATIC int
1037 xfs_qm_quotacheck_dqadjust(
1038 	struct xfs_inode	*ip,
1039 	xfs_dqid_t		id,
1040 	uint			type,
1041 	xfs_qcnt_t		nblks,
1042 	xfs_qcnt_t		rtblks)
1043 {
1044 	struct xfs_mount	*mp = ip->i_mount;
1045 	struct xfs_dquot	*dqp;
1046 	int			error;
1047 
1048 	error = xfs_qm_dqget(mp, ip, id, type,
1049 			     XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1050 	if (error) {
1051 		/*
1052 		 * Shouldn't be able to turn off quotas here.
1053 		 */
1054 		ASSERT(error != -ESRCH);
1055 		ASSERT(error != -ENOENT);
1056 		return error;
1057 	}
1058 
1059 	trace_xfs_dqadjust(dqp);
1060 
1061 	/*
1062 	 * Adjust the inode count and the block count to reflect this inode's
1063 	 * resource usage.
1064 	 */
1065 	be64_add_cpu(&dqp->q_core.d_icount, 1);
1066 	dqp->q_res_icount++;
1067 	if (nblks) {
1068 		be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1069 		dqp->q_res_bcount += nblks;
1070 	}
1071 	if (rtblks) {
1072 		be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1073 		dqp->q_res_rtbcount += rtblks;
1074 	}
1075 
1076 	/*
1077 	 * Set default limits, adjust timers (since we changed usages)
1078 	 *
1079 	 * There are no timers for the default values set in the root dquot.
1080 	 */
1081 	if (dqp->q_core.d_id) {
1082 		xfs_qm_adjust_dqlimits(mp, dqp);
1083 		xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1084 	}
1085 
1086 	dqp->dq_flags |= XFS_DQ_DIRTY;
1087 	xfs_qm_dqput(dqp);
1088 	return 0;
1089 }
1090 
1091 STATIC int
1092 xfs_qm_get_rtblks(
1093 	xfs_inode_t	*ip,
1094 	xfs_qcnt_t	*O_rtblks)
1095 {
1096 	xfs_filblks_t	rtblks;			/* total rt blks */
1097 	xfs_extnum_t	idx;			/* extent record index */
1098 	xfs_ifork_t	*ifp;			/* inode fork pointer */
1099 	xfs_extnum_t	nextents;		/* number of extent entries */
1100 	int		error;
1101 
1102 	ASSERT(XFS_IS_REALTIME_INODE(ip));
1103 	ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1104 	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1105 		if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1106 			return error;
1107 	}
1108 	rtblks = 0;
1109 	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1110 	for (idx = 0; idx < nextents; idx++)
1111 		rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1112 	*O_rtblks = (xfs_qcnt_t)rtblks;
1113 	return 0;
1114 }
1115 
1116 /*
1117  * callback routine supplied to bulkstat(). Given an inumber, find its
1118  * dquots and update them to account for resources taken by that inode.
1119  */
1120 /* ARGSUSED */
1121 STATIC int
1122 xfs_qm_dqusage_adjust(
1123 	xfs_mount_t	*mp,		/* mount point for filesystem */
1124 	xfs_ino_t	ino,		/* inode number to get data for */
1125 	void		__user *buffer,	/* not used */
1126 	int		ubsize,		/* not used */
1127 	int		*ubused,	/* not used */
1128 	int		*res)		/* result code value */
1129 {
1130 	xfs_inode_t	*ip;
1131 	xfs_qcnt_t	nblks, rtblks = 0;
1132 	int		error;
1133 
1134 	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1135 
1136 	/*
1137 	 * rootino must have its resources accounted for, not so with the quota
1138 	 * inodes.
1139 	 */
1140 	if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1141 		*res = BULKSTAT_RV_NOTHING;
1142 		return -EINVAL;
1143 	}
1144 
1145 	/*
1146 	 * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1147 	 * interface expects the inode to be exclusively locked because that's
1148 	 * the case in all other instances. It's OK that we do this because
1149 	 * quotacheck is done only at mount time.
1150 	 */
1151 	error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1152 	if (error) {
1153 		*res = BULKSTAT_RV_NOTHING;
1154 		return error;
1155 	}
1156 
1157 	ASSERT(ip->i_delayed_blks == 0);
1158 
1159 	if (XFS_IS_REALTIME_INODE(ip)) {
1160 		/*
1161 		 * Walk thru the extent list and count the realtime blocks.
1162 		 */
1163 		error = xfs_qm_get_rtblks(ip, &rtblks);
1164 		if (error)
1165 			goto error0;
1166 	}
1167 
1168 	nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1169 
1170 	/*
1171 	 * Add the (disk blocks and inode) resources occupied by this
1172 	 * inode to its dquots. We do this adjustment in the incore dquot,
1173 	 * and also copy the changes to its buffer.
1174 	 * We don't care about putting these changes in a transaction
1175 	 * envelope because if we crash in the middle of a 'quotacheck'
1176 	 * we have to start from the beginning anyway.
1177 	 * Once we're done, we'll log all the dquot bufs.
1178 	 *
1179 	 * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1180 	 * and quotaoffs don't race. (Quotachecks happen at mount time only).
1181 	 */
1182 	if (XFS_IS_UQUOTA_ON(mp)) {
1183 		error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1184 						   XFS_DQ_USER, nblks, rtblks);
1185 		if (error)
1186 			goto error0;
1187 	}
1188 
1189 	if (XFS_IS_GQUOTA_ON(mp)) {
1190 		error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1191 						   XFS_DQ_GROUP, nblks, rtblks);
1192 		if (error)
1193 			goto error0;
1194 	}
1195 
1196 	if (XFS_IS_PQUOTA_ON(mp)) {
1197 		error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1198 						   XFS_DQ_PROJ, nblks, rtblks);
1199 		if (error)
1200 			goto error0;
1201 	}
1202 
1203 	xfs_iunlock(ip, XFS_ILOCK_EXCL);
1204 	IRELE(ip);
1205 	*res = BULKSTAT_RV_DIDONE;
1206 	return 0;
1207 
1208 error0:
1209 	xfs_iunlock(ip, XFS_ILOCK_EXCL);
1210 	IRELE(ip);
1211 	*res = BULKSTAT_RV_GIVEUP;
1212 	return error;
1213 }
1214 
1215 STATIC int
1216 xfs_qm_flush_one(
1217 	struct xfs_dquot	*dqp,
1218 	void			*data)
1219 {
1220 	struct list_head	*buffer_list = data;
1221 	struct xfs_buf		*bp = NULL;
1222 	int			error = 0;
1223 
1224 	xfs_dqlock(dqp);
1225 	if (dqp->dq_flags & XFS_DQ_FREEING)
1226 		goto out_unlock;
1227 	if (!XFS_DQ_IS_DIRTY(dqp))
1228 		goto out_unlock;
1229 
1230 	xfs_dqflock(dqp);
1231 	error = xfs_qm_dqflush(dqp, &bp);
1232 	if (error)
1233 		goto out_unlock;
1234 
1235 	xfs_buf_delwri_queue(bp, buffer_list);
1236 	xfs_buf_relse(bp);
1237 out_unlock:
1238 	xfs_dqunlock(dqp);
1239 	return error;
1240 }
1241 
1242 /*
1243  * Walk thru all the filesystem inodes and construct a consistent view
1244  * of the disk quota world. If the quotacheck fails, disable quotas.
1245  */
1246 STATIC int
1247 xfs_qm_quotacheck(
1248 	xfs_mount_t	*mp)
1249 {
1250 	int			done, count, error, error2;
1251 	xfs_ino_t		lastino;
1252 	size_t			structsz;
1253 	uint			flags;
1254 	LIST_HEAD		(buffer_list);
1255 	struct xfs_inode	*uip = mp->m_quotainfo->qi_uquotaip;
1256 	struct xfs_inode	*gip = mp->m_quotainfo->qi_gquotaip;
1257 	struct xfs_inode	*pip = mp->m_quotainfo->qi_pquotaip;
1258 
1259 	count = INT_MAX;
1260 	structsz = 1;
1261 	lastino = 0;
1262 	flags = 0;
1263 
1264 	ASSERT(uip || gip || pip);
1265 	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1266 
1267 	xfs_notice(mp, "Quotacheck needed: Please wait.");
1268 
1269 	/*
1270 	 * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1271 	 * their counters to zero. We need a clean slate.
1272 	 * We don't log our changes till later.
1273 	 */
1274 	if (uip) {
1275 		error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1276 					 &buffer_list);
1277 		if (error)
1278 			goto error_return;
1279 		flags |= XFS_UQUOTA_CHKD;
1280 	}
1281 
1282 	if (gip) {
1283 		error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1284 					 &buffer_list);
1285 		if (error)
1286 			goto error_return;
1287 		flags |= XFS_GQUOTA_CHKD;
1288 	}
1289 
1290 	if (pip) {
1291 		error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1292 					 &buffer_list);
1293 		if (error)
1294 			goto error_return;
1295 		flags |= XFS_PQUOTA_CHKD;
1296 	}
1297 
1298 	do {
1299 		/*
1300 		 * Iterate thru all the inodes in the file system,
1301 		 * adjusting the corresponding dquot counters in core.
1302 		 */
1303 		error = xfs_bulkstat(mp, &lastino, &count,
1304 				     xfs_qm_dqusage_adjust,
1305 				     structsz, NULL, &done);
1306 		if (error)
1307 			break;
1308 
1309 	} while (!done);
1310 
1311 	/*
1312 	 * We've made all the changes that we need to make incore.  Flush them
1313 	 * down to disk buffers if everything was updated successfully.
1314 	 */
1315 	if (XFS_IS_UQUOTA_ON(mp)) {
1316 		error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1317 					  &buffer_list);
1318 	}
1319 	if (XFS_IS_GQUOTA_ON(mp)) {
1320 		error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1321 					   &buffer_list);
1322 		if (!error)
1323 			error = error2;
1324 	}
1325 	if (XFS_IS_PQUOTA_ON(mp)) {
1326 		error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1327 					   &buffer_list);
1328 		if (!error)
1329 			error = error2;
1330 	}
1331 
1332 	error2 = xfs_buf_delwri_submit(&buffer_list);
1333 	if (!error)
1334 		error = error2;
1335 
1336 	/*
1337 	 * We can get this error if we couldn't do a dquot allocation inside
1338 	 * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1339 	 * dirty dquots that might be cached, we just want to get rid of them
1340 	 * and turn quotaoff. The dquots won't be attached to any of the inodes
1341 	 * at this point (because we intentionally didn't in dqget_noattach).
1342 	 */
1343 	if (error) {
1344 		xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1345 		goto error_return;
1346 	}
1347 
1348 	/*
1349 	 * If one type of quotas is off, then it will lose its
1350 	 * quotachecked status, since we won't be doing accounting for
1351 	 * that type anymore.
1352 	 */
1353 	mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1354 	mp->m_qflags |= flags;
1355 
1356  error_return:
1357 	while (!list_empty(&buffer_list)) {
1358 		struct xfs_buf *bp =
1359 			list_first_entry(&buffer_list, struct xfs_buf, b_list);
1360 		list_del_init(&bp->b_list);
1361 		xfs_buf_relse(bp);
1362 	}
1363 
1364 	if (error) {
1365 		xfs_warn(mp,
1366 	"Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1367 			error);
1368 		/*
1369 		 * We must turn off quotas.
1370 		 */
1371 		ASSERT(mp->m_quotainfo != NULL);
1372 		xfs_qm_destroy_quotainfo(mp);
1373 		if (xfs_mount_reset_sbqflags(mp)) {
1374 			xfs_warn(mp,
1375 				"Quotacheck: Failed to reset quota flags.");
1376 		}
1377 	} else
1378 		xfs_notice(mp, "Quotacheck: Done.");
1379 	return error;
1380 }
1381 
1382 /*
1383  * This is called from xfs_mountfs to start quotas and initialize all
1384  * necessary data structures like quotainfo.  This is also responsible for
1385  * running a quotacheck as necessary.  We are guaranteed that the superblock
1386  * is consistently read in at this point.
1387  *
1388  * If we fail here, the mount will continue with quota turned off. We don't
1389  * need to inidicate success or failure at all.
1390  */
1391 void
1392 xfs_qm_mount_quotas(
1393 	struct xfs_mount	*mp)
1394 {
1395 	int			error = 0;
1396 	uint			sbf;
1397 
1398 	/*
1399 	 * If quotas on realtime volumes is not supported, we disable
1400 	 * quotas immediately.
1401 	 */
1402 	if (mp->m_sb.sb_rextents) {
1403 		xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1404 		mp->m_qflags = 0;
1405 		goto write_changes;
1406 	}
1407 
1408 	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1409 
1410 	/*
1411 	 * Allocate the quotainfo structure inside the mount struct, and
1412 	 * create quotainode(s), and change/rev superblock if necessary.
1413 	 */
1414 	error = xfs_qm_init_quotainfo(mp);
1415 	if (error) {
1416 		/*
1417 		 * We must turn off quotas.
1418 		 */
1419 		ASSERT(mp->m_quotainfo == NULL);
1420 		mp->m_qflags = 0;
1421 		goto write_changes;
1422 	}
1423 	/*
1424 	 * If any of the quotas are not consistent, do a quotacheck.
1425 	 */
1426 	if (XFS_QM_NEED_QUOTACHECK(mp)) {
1427 		error = xfs_qm_quotacheck(mp);
1428 		if (error) {
1429 			/* Quotacheck failed and disabled quotas. */
1430 			return;
1431 		}
1432 	}
1433 	/*
1434 	 * If one type of quotas is off, then it will lose its
1435 	 * quotachecked status, since we won't be doing accounting for
1436 	 * that type anymore.
1437 	 */
1438 	if (!XFS_IS_UQUOTA_ON(mp))
1439 		mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1440 	if (!XFS_IS_GQUOTA_ON(mp))
1441 		mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1442 	if (!XFS_IS_PQUOTA_ON(mp))
1443 		mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1444 
1445  write_changes:
1446 	/*
1447 	 * We actually don't have to acquire the m_sb_lock at all.
1448 	 * This can only be called from mount, and that's single threaded. XXX
1449 	 */
1450 	spin_lock(&mp->m_sb_lock);
1451 	sbf = mp->m_sb.sb_qflags;
1452 	mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1453 	spin_unlock(&mp->m_sb_lock);
1454 
1455 	if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1456 		if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
1457 			/*
1458 			 * We could only have been turning quotas off.
1459 			 * We aren't in very good shape actually because
1460 			 * the incore structures are convinced that quotas are
1461 			 * off, but the on disk superblock doesn't know that !
1462 			 */
1463 			ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1464 			xfs_alert(mp, "%s: Superblock update failed!",
1465 				__func__);
1466 		}
1467 	}
1468 
1469 	if (error) {
1470 		xfs_warn(mp, "Failed to initialize disk quotas.");
1471 		return;
1472 	}
1473 }
1474 
1475 /*
1476  * This is called after the superblock has been read in and we're ready to
1477  * iget the quota inodes.
1478  */
1479 STATIC int
1480 xfs_qm_init_quotainos(
1481 	xfs_mount_t	*mp)
1482 {
1483 	struct xfs_inode	*uip = NULL;
1484 	struct xfs_inode	*gip = NULL;
1485 	struct xfs_inode	*pip = NULL;
1486 	int			error;
1487 	__int64_t		sbflags = 0;
1488 	uint			flags = 0;
1489 
1490 	ASSERT(mp->m_quotainfo);
1491 
1492 	/*
1493 	 * Get the uquota and gquota inodes
1494 	 */
1495 	if (xfs_sb_version_hasquota(&mp->m_sb)) {
1496 		if (XFS_IS_UQUOTA_ON(mp) &&
1497 		    mp->m_sb.sb_uquotino != NULLFSINO) {
1498 			ASSERT(mp->m_sb.sb_uquotino > 0);
1499 			error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1500 					     0, 0, &uip);
1501 			if (error)
1502 				return error;
1503 		}
1504 		if (XFS_IS_GQUOTA_ON(mp) &&
1505 		    mp->m_sb.sb_gquotino != NULLFSINO) {
1506 			ASSERT(mp->m_sb.sb_gquotino > 0);
1507 			error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1508 					     0, 0, &gip);
1509 			if (error)
1510 				goto error_rele;
1511 		}
1512 		if (XFS_IS_PQUOTA_ON(mp) &&
1513 		    mp->m_sb.sb_pquotino != NULLFSINO) {
1514 			ASSERT(mp->m_sb.sb_pquotino > 0);
1515 			error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1516 					     0, 0, &pip);
1517 			if (error)
1518 				goto error_rele;
1519 		}
1520 	} else {
1521 		flags |= XFS_QMOPT_SBVERSION;
1522 		sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1523 			    XFS_SB_GQUOTINO | XFS_SB_PQUOTINO |
1524 			    XFS_SB_QFLAGS);
1525 	}
1526 
1527 	/*
1528 	 * Create the three inodes, if they don't exist already. The changes
1529 	 * made above will get added to a transaction and logged in one of
1530 	 * the qino_alloc calls below.  If the device is readonly,
1531 	 * temporarily switch to read-write to do this.
1532 	 */
1533 	if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1534 		error = xfs_qm_qino_alloc(mp, &uip,
1535 					      sbflags | XFS_SB_UQUOTINO,
1536 					      flags | XFS_QMOPT_UQUOTA);
1537 		if (error)
1538 			goto error_rele;
1539 
1540 		flags &= ~XFS_QMOPT_SBVERSION;
1541 	}
1542 	if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1543 		error = xfs_qm_qino_alloc(mp, &gip,
1544 					  sbflags | XFS_SB_GQUOTINO,
1545 					  flags | XFS_QMOPT_GQUOTA);
1546 		if (error)
1547 			goto error_rele;
1548 
1549 		flags &= ~XFS_QMOPT_SBVERSION;
1550 	}
1551 	if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1552 		error = xfs_qm_qino_alloc(mp, &pip,
1553 					  sbflags | XFS_SB_PQUOTINO,
1554 					  flags | XFS_QMOPT_PQUOTA);
1555 		if (error)
1556 			goto error_rele;
1557 	}
1558 
1559 	mp->m_quotainfo->qi_uquotaip = uip;
1560 	mp->m_quotainfo->qi_gquotaip = gip;
1561 	mp->m_quotainfo->qi_pquotaip = pip;
1562 
1563 	return 0;
1564 
1565 error_rele:
1566 	if (uip)
1567 		IRELE(uip);
1568 	if (gip)
1569 		IRELE(gip);
1570 	if (pip)
1571 		IRELE(pip);
1572 	return error;
1573 }
1574 
1575 STATIC void
1576 xfs_qm_dqfree_one(
1577 	struct xfs_dquot	*dqp)
1578 {
1579 	struct xfs_mount	*mp = dqp->q_mount;
1580 	struct xfs_quotainfo	*qi = mp->m_quotainfo;
1581 
1582 	mutex_lock(&qi->qi_tree_lock);
1583 	radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1584 			  be32_to_cpu(dqp->q_core.d_id));
1585 
1586 	qi->qi_dquots--;
1587 	mutex_unlock(&qi->qi_tree_lock);
1588 
1589 	xfs_qm_dqdestroy(dqp);
1590 }
1591 
1592 /*
1593  * Start a transaction and write the incore superblock changes to
1594  * disk. flags parameter indicates which fields have changed.
1595  */
1596 int
1597 xfs_qm_write_sb_changes(
1598 	xfs_mount_t	*mp,
1599 	__int64_t	flags)
1600 {
1601 	xfs_trans_t	*tp;
1602 	int		error;
1603 
1604 	tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
1605 	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_sbchange, 0, 0);
1606 	if (error) {
1607 		xfs_trans_cancel(tp, 0);
1608 		return error;
1609 	}
1610 
1611 	xfs_mod_sb(tp, flags);
1612 	error = xfs_trans_commit(tp, 0);
1613 
1614 	return error;
1615 }
1616 
1617 
1618 /* --------------- utility functions for vnodeops ---------------- */
1619 
1620 
1621 /*
1622  * Given an inode, a uid, gid and prid make sure that we have
1623  * allocated relevant dquot(s) on disk, and that we won't exceed inode
1624  * quotas by creating this file.
1625  * This also attaches dquot(s) to the given inode after locking it,
1626  * and returns the dquots corresponding to the uid and/or gid.
1627  *
1628  * in	: inode (unlocked)
1629  * out	: udquot, gdquot with references taken and unlocked
1630  */
1631 int
1632 xfs_qm_vop_dqalloc(
1633 	struct xfs_inode	*ip,
1634 	xfs_dqid_t		uid,
1635 	xfs_dqid_t		gid,
1636 	prid_t			prid,
1637 	uint			flags,
1638 	struct xfs_dquot	**O_udqpp,
1639 	struct xfs_dquot	**O_gdqpp,
1640 	struct xfs_dquot	**O_pdqpp)
1641 {
1642 	struct xfs_mount	*mp = ip->i_mount;
1643 	struct xfs_dquot	*uq = NULL;
1644 	struct xfs_dquot	*gq = NULL;
1645 	struct xfs_dquot	*pq = NULL;
1646 	int			error;
1647 	uint			lockflags;
1648 
1649 	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1650 		return 0;
1651 
1652 	lockflags = XFS_ILOCK_EXCL;
1653 	xfs_ilock(ip, lockflags);
1654 
1655 	if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1656 		gid = ip->i_d.di_gid;
1657 
1658 	/*
1659 	 * Attach the dquot(s) to this inode, doing a dquot allocation
1660 	 * if necessary. The dquot(s) will not be locked.
1661 	 */
1662 	if (XFS_NOT_DQATTACHED(mp, ip)) {
1663 		error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1664 		if (error) {
1665 			xfs_iunlock(ip, lockflags);
1666 			return error;
1667 		}
1668 	}
1669 
1670 	if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1671 		if (ip->i_d.di_uid != uid) {
1672 			/*
1673 			 * What we need is the dquot that has this uid, and
1674 			 * if we send the inode to dqget, the uid of the inode
1675 			 * takes priority over what's sent in the uid argument.
1676 			 * We must unlock inode here before calling dqget if
1677 			 * we're not sending the inode, because otherwise
1678 			 * we'll deadlock by doing trans_reserve while
1679 			 * holding ilock.
1680 			 */
1681 			xfs_iunlock(ip, lockflags);
1682 			error = xfs_qm_dqget(mp, NULL, uid,
1683 						 XFS_DQ_USER,
1684 						 XFS_QMOPT_DQALLOC |
1685 						 XFS_QMOPT_DOWARN,
1686 						 &uq);
1687 			if (error) {
1688 				ASSERT(error != -ENOENT);
1689 				return error;
1690 			}
1691 			/*
1692 			 * Get the ilock in the right order.
1693 			 */
1694 			xfs_dqunlock(uq);
1695 			lockflags = XFS_ILOCK_SHARED;
1696 			xfs_ilock(ip, lockflags);
1697 		} else {
1698 			/*
1699 			 * Take an extra reference, because we'll return
1700 			 * this to caller
1701 			 */
1702 			ASSERT(ip->i_udquot);
1703 			uq = xfs_qm_dqhold(ip->i_udquot);
1704 		}
1705 	}
1706 	if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1707 		if (ip->i_d.di_gid != gid) {
1708 			xfs_iunlock(ip, lockflags);
1709 			error = xfs_qm_dqget(mp, NULL, gid,
1710 						 XFS_DQ_GROUP,
1711 						 XFS_QMOPT_DQALLOC |
1712 						 XFS_QMOPT_DOWARN,
1713 						 &gq);
1714 			if (error) {
1715 				ASSERT(error != -ENOENT);
1716 				goto error_rele;
1717 			}
1718 			xfs_dqunlock(gq);
1719 			lockflags = XFS_ILOCK_SHARED;
1720 			xfs_ilock(ip, lockflags);
1721 		} else {
1722 			ASSERT(ip->i_gdquot);
1723 			gq = xfs_qm_dqhold(ip->i_gdquot);
1724 		}
1725 	}
1726 	if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1727 		if (xfs_get_projid(ip) != prid) {
1728 			xfs_iunlock(ip, lockflags);
1729 			error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1730 						 XFS_DQ_PROJ,
1731 						 XFS_QMOPT_DQALLOC |
1732 						 XFS_QMOPT_DOWARN,
1733 						 &pq);
1734 			if (error) {
1735 				ASSERT(error != -ENOENT);
1736 				goto error_rele;
1737 			}
1738 			xfs_dqunlock(pq);
1739 			lockflags = XFS_ILOCK_SHARED;
1740 			xfs_ilock(ip, lockflags);
1741 		} else {
1742 			ASSERT(ip->i_pdquot);
1743 			pq = xfs_qm_dqhold(ip->i_pdquot);
1744 		}
1745 	}
1746 	if (uq)
1747 		trace_xfs_dquot_dqalloc(ip);
1748 
1749 	xfs_iunlock(ip, lockflags);
1750 	if (O_udqpp)
1751 		*O_udqpp = uq;
1752 	else if (uq)
1753 		xfs_qm_dqrele(uq);
1754 	if (O_gdqpp)
1755 		*O_gdqpp = gq;
1756 	else if (gq)
1757 		xfs_qm_dqrele(gq);
1758 	if (O_pdqpp)
1759 		*O_pdqpp = pq;
1760 	else if (pq)
1761 		xfs_qm_dqrele(pq);
1762 	return 0;
1763 
1764 error_rele:
1765 	if (gq)
1766 		xfs_qm_dqrele(gq);
1767 	if (uq)
1768 		xfs_qm_dqrele(uq);
1769 	return error;
1770 }
1771 
1772 /*
1773  * Actually transfer ownership, and do dquot modifications.
1774  * These were already reserved.
1775  */
1776 xfs_dquot_t *
1777 xfs_qm_vop_chown(
1778 	xfs_trans_t	*tp,
1779 	xfs_inode_t	*ip,
1780 	xfs_dquot_t	**IO_olddq,
1781 	xfs_dquot_t	*newdq)
1782 {
1783 	xfs_dquot_t	*prevdq;
1784 	uint		bfield = XFS_IS_REALTIME_INODE(ip) ?
1785 				 XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1786 
1787 
1788 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1789 	ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1790 
1791 	/* old dquot */
1792 	prevdq = *IO_olddq;
1793 	ASSERT(prevdq);
1794 	ASSERT(prevdq != newdq);
1795 
1796 	xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1797 	xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1798 
1799 	/* the sparkling new dquot */
1800 	xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1801 	xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1802 
1803 	/*
1804 	 * Take an extra reference, because the inode is going to keep
1805 	 * this dquot pointer even after the trans_commit.
1806 	 */
1807 	*IO_olddq = xfs_qm_dqhold(newdq);
1808 
1809 	return prevdq;
1810 }
1811 
1812 /*
1813  * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1814  */
1815 int
1816 xfs_qm_vop_chown_reserve(
1817 	struct xfs_trans	*tp,
1818 	struct xfs_inode	*ip,
1819 	struct xfs_dquot	*udqp,
1820 	struct xfs_dquot	*gdqp,
1821 	struct xfs_dquot	*pdqp,
1822 	uint			flags)
1823 {
1824 	struct xfs_mount	*mp = ip->i_mount;
1825 	uint			delblks, blkflags, prjflags = 0;
1826 	struct xfs_dquot	*udq_unres = NULL;
1827 	struct xfs_dquot	*gdq_unres = NULL;
1828 	struct xfs_dquot	*pdq_unres = NULL;
1829 	struct xfs_dquot	*udq_delblks = NULL;
1830 	struct xfs_dquot	*gdq_delblks = NULL;
1831 	struct xfs_dquot	*pdq_delblks = NULL;
1832 	int			error;
1833 
1834 
1835 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1836 	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1837 
1838 	delblks = ip->i_delayed_blks;
1839 	blkflags = XFS_IS_REALTIME_INODE(ip) ?
1840 			XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1841 
1842 	if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1843 	    ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1844 		udq_delblks = udqp;
1845 		/*
1846 		 * If there are delayed allocation blocks, then we have to
1847 		 * unreserve those from the old dquot, and add them to the
1848 		 * new dquot.
1849 		 */
1850 		if (delblks) {
1851 			ASSERT(ip->i_udquot);
1852 			udq_unres = ip->i_udquot;
1853 		}
1854 	}
1855 	if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1856 	    ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1857 		gdq_delblks = gdqp;
1858 		if (delblks) {
1859 			ASSERT(ip->i_gdquot);
1860 			gdq_unres = ip->i_gdquot;
1861 		}
1862 	}
1863 
1864 	if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1865 	    xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1866 		prjflags = XFS_QMOPT_ENOSPC;
1867 		pdq_delblks = pdqp;
1868 		if (delblks) {
1869 			ASSERT(ip->i_pdquot);
1870 			pdq_unres = ip->i_pdquot;
1871 		}
1872 	}
1873 
1874 	error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1875 				udq_delblks, gdq_delblks, pdq_delblks,
1876 				ip->i_d.di_nblocks, 1,
1877 				flags | blkflags | prjflags);
1878 	if (error)
1879 		return error;
1880 
1881 	/*
1882 	 * Do the delayed blks reservations/unreservations now. Since, these
1883 	 * are done without the help of a transaction, if a reservation fails
1884 	 * its previous reservations won't be automatically undone by trans
1885 	 * code. So, we have to do it manually here.
1886 	 */
1887 	if (delblks) {
1888 		/*
1889 		 * Do the reservations first. Unreservation can't fail.
1890 		 */
1891 		ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1892 		ASSERT(udq_unres || gdq_unres || pdq_unres);
1893 		error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1894 			    udq_delblks, gdq_delblks, pdq_delblks,
1895 			    (xfs_qcnt_t)delblks, 0,
1896 			    flags | blkflags | prjflags);
1897 		if (error)
1898 			return error;
1899 		xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1900 				udq_unres, gdq_unres, pdq_unres,
1901 				-((xfs_qcnt_t)delblks), 0, blkflags);
1902 	}
1903 
1904 	return 0;
1905 }
1906 
1907 int
1908 xfs_qm_vop_rename_dqattach(
1909 	struct xfs_inode	**i_tab)
1910 {
1911 	struct xfs_mount	*mp = i_tab[0]->i_mount;
1912 	int			i;
1913 
1914 	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1915 		return 0;
1916 
1917 	for (i = 0; (i < 4 && i_tab[i]); i++) {
1918 		struct xfs_inode	*ip = i_tab[i];
1919 		int			error;
1920 
1921 		/*
1922 		 * Watch out for duplicate entries in the table.
1923 		 */
1924 		if (i == 0 || ip != i_tab[i-1]) {
1925 			if (XFS_NOT_DQATTACHED(mp, ip)) {
1926 				error = xfs_qm_dqattach(ip, 0);
1927 				if (error)
1928 					return error;
1929 			}
1930 		}
1931 	}
1932 	return 0;
1933 }
1934 
1935 void
1936 xfs_qm_vop_create_dqattach(
1937 	struct xfs_trans	*tp,
1938 	struct xfs_inode	*ip,
1939 	struct xfs_dquot	*udqp,
1940 	struct xfs_dquot	*gdqp,
1941 	struct xfs_dquot	*pdqp)
1942 {
1943 	struct xfs_mount	*mp = tp->t_mountp;
1944 
1945 	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1946 		return;
1947 
1948 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1949 	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1950 
1951 	if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1952 		ASSERT(ip->i_udquot == NULL);
1953 		ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1954 
1955 		ip->i_udquot = xfs_qm_dqhold(udqp);
1956 		xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1957 	}
1958 	if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1959 		ASSERT(ip->i_gdquot == NULL);
1960 		ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1961 		ip->i_gdquot = xfs_qm_dqhold(gdqp);
1962 		xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1963 	}
1964 	if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1965 		ASSERT(ip->i_pdquot == NULL);
1966 		ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1967 
1968 		ip->i_pdquot = xfs_qm_dqhold(pdqp);
1969 		xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1970 	}
1971 }
1972 
1973