PageRenderTime 73ms CodeModel.GetById 20ms app.highlight 44ms RepoModel.GetById 0ms app.codeStats 1ms

/fs/xfs/xfs_qm.c

https://bitbucket.org/emiliolopez/linux
C | 1971 lines | 1317 code | 237 blank | 417 comment | 269 complexity | 8d1935826a53247b73e78418e1a45437 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
   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_bmap_util.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
  42/*
  43 * The global quota manager. There is only one of these for the entire
  44 * system, _not_ one per file system. XQM keeps track of the overall
  45 * quota functionality, including maintaining the freelist and hash
  46 * tables of dquots.
  47 */
  48STATIC int	xfs_qm_init_quotainos(xfs_mount_t *);
  49STATIC int	xfs_qm_init_quotainfo(xfs_mount_t *);
  50
  51
  52STATIC void	xfs_qm_dqfree_one(struct xfs_dquot *dqp);
  53/*
  54 * We use the batch lookup interface to iterate over the dquots as it
  55 * currently is the only interface into the radix tree code that allows
  56 * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  57 * operations is fine as all callers are used either during mount/umount
  58 * or quotaoff.
  59 */
  60#define XFS_DQ_LOOKUP_BATCH	32
  61
  62STATIC int
  63xfs_qm_dquot_walk(
  64	struct xfs_mount	*mp,
  65	int			type,
  66	int			(*execute)(struct xfs_dquot *dqp, void *data),
  67	void			*data)
  68{
  69	struct xfs_quotainfo	*qi = mp->m_quotainfo;
  70	struct radix_tree_root	*tree = xfs_dquot_tree(qi, type);
  71	uint32_t		next_index;
  72	int			last_error = 0;
  73	int			skipped;
  74	int			nr_found;
  75
  76restart:
  77	skipped = 0;
  78	next_index = 0;
  79	nr_found = 0;
  80
  81	while (1) {
  82		struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  83		int		error = 0;
  84		int		i;
  85
  86		mutex_lock(&qi->qi_tree_lock);
  87		nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  88					next_index, XFS_DQ_LOOKUP_BATCH);
  89		if (!nr_found) {
  90			mutex_unlock(&qi->qi_tree_lock);
  91			break;
  92		}
  93
  94		for (i = 0; i < nr_found; i++) {
  95			struct xfs_dquot *dqp = batch[i];
  96
  97			next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
  98
  99			error = execute(batch[i], data);
 100			if (error == -EAGAIN) {
 101				skipped++;
 102				continue;
 103			}
 104			if (error && last_error != -EFSCORRUPTED)
 105				last_error = error;
 106		}
 107
 108		mutex_unlock(&qi->qi_tree_lock);
 109
 110		/* bail out if the filesystem is corrupted.  */
 111		if (last_error == -EFSCORRUPTED) {
 112			skipped = 0;
 113			break;
 114		}
 115		/* we're done if id overflows back to zero */
 116		if (!next_index)
 117			break;
 118	}
 119
 120	if (skipped) {
 121		delay(1);
 122		goto restart;
 123	}
 124
 125	return last_error;
 126}
 127
 128
 129/*
 130 * Purge a dquot from all tracking data structures and free it.
 131 */
 132STATIC int
 133xfs_qm_dqpurge(
 134	struct xfs_dquot	*dqp,
 135	void			*data)
 136{
 137	struct xfs_mount	*mp = dqp->q_mount;
 138	struct xfs_quotainfo	*qi = mp->m_quotainfo;
 139
 140	xfs_dqlock(dqp);
 141	if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 142		xfs_dqunlock(dqp);
 143		return -EAGAIN;
 144	}
 145
 146	dqp->dq_flags |= XFS_DQ_FREEING;
 147
 148	xfs_dqflock(dqp);
 149
 150	/*
 151	 * If we are turning this type of quotas off, we don't care
 152	 * about the dirty metadata sitting in this dquot. OTOH, if
 153	 * we're unmounting, we do care, so we flush it and wait.
 154	 */
 155	if (XFS_DQ_IS_DIRTY(dqp)) {
 156		struct xfs_buf	*bp = NULL;
 157		int		error;
 158
 159		/*
 160		 * We don't care about getting disk errors here. We need
 161		 * to purge this dquot anyway, so we go ahead regardless.
 162		 */
 163		error = xfs_qm_dqflush(dqp, &bp);
 164		if (error) {
 165			xfs_warn(mp, "%s: dquot %p flush failed",
 166				__func__, dqp);
 167		} else {
 168			error = xfs_bwrite(bp);
 169			xfs_buf_relse(bp);
 170		}
 171		xfs_dqflock(dqp);
 172	}
 173
 174	ASSERT(atomic_read(&dqp->q_pincount) == 0);
 175	ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 176	       !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 177
 178	xfs_dqfunlock(dqp);
 179	xfs_dqunlock(dqp);
 180
 181	radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 182			  be32_to_cpu(dqp->q_core.d_id));
 183	qi->qi_dquots--;
 184
 185	/*
 186	 * We move dquots to the freelist as soon as their reference count
 187	 * hits zero, so it really should be on the freelist here.
 188	 */
 189	ASSERT(!list_empty(&dqp->q_lru));
 190	list_lru_del(&qi->qi_lru, &dqp->q_lru);
 191	XFS_STATS_DEC(mp, xs_qm_dquot_unused);
 192
 193	xfs_qm_dqdestroy(dqp);
 194	return 0;
 195}
 196
 197/*
 198 * Purge the dquot cache.
 199 */
 200void
 201xfs_qm_dqpurge_all(
 202	struct xfs_mount	*mp,
 203	uint			flags)
 204{
 205	if (flags & XFS_QMOPT_UQUOTA)
 206		xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 207	if (flags & XFS_QMOPT_GQUOTA)
 208		xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 209	if (flags & XFS_QMOPT_PQUOTA)
 210		xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 211}
 212
 213/*
 214 * Just destroy the quotainfo structure.
 215 */
 216void
 217xfs_qm_unmount(
 218	struct xfs_mount	*mp)
 219{
 220	if (mp->m_quotainfo) {
 221		xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 222		xfs_qm_destroy_quotainfo(mp);
 223	}
 224}
 225
 226/*
 227 * Called from the vfsops layer.
 228 */
 229void
 230xfs_qm_unmount_quotas(
 231	xfs_mount_t	*mp)
 232{
 233	/*
 234	 * Release the dquots that root inode, et al might be holding,
 235	 * before we flush quotas and blow away the quotainfo structure.
 236	 */
 237	ASSERT(mp->m_rootip);
 238	xfs_qm_dqdetach(mp->m_rootip);
 239	if (mp->m_rbmip)
 240		xfs_qm_dqdetach(mp->m_rbmip);
 241	if (mp->m_rsumip)
 242		xfs_qm_dqdetach(mp->m_rsumip);
 243
 244	/*
 245	 * Release the quota inodes.
 246	 */
 247	if (mp->m_quotainfo) {
 248		if (mp->m_quotainfo->qi_uquotaip) {
 249			IRELE(mp->m_quotainfo->qi_uquotaip);
 250			mp->m_quotainfo->qi_uquotaip = NULL;
 251		}
 252		if (mp->m_quotainfo->qi_gquotaip) {
 253			IRELE(mp->m_quotainfo->qi_gquotaip);
 254			mp->m_quotainfo->qi_gquotaip = NULL;
 255		}
 256		if (mp->m_quotainfo->qi_pquotaip) {
 257			IRELE(mp->m_quotainfo->qi_pquotaip);
 258			mp->m_quotainfo->qi_pquotaip = NULL;
 259		}
 260	}
 261}
 262
 263STATIC int
 264xfs_qm_dqattach_one(
 265	xfs_inode_t	*ip,
 266	xfs_dqid_t	id,
 267	uint		type,
 268	uint		doalloc,
 269	xfs_dquot_t	**IO_idqpp)
 270{
 271	xfs_dquot_t	*dqp;
 272	int		error;
 273
 274	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 275	error = 0;
 276
 277	/*
 278	 * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 279	 * or &i_gdquot. This made the code look weird, but made the logic a lot
 280	 * simpler.
 281	 */
 282	dqp = *IO_idqpp;
 283	if (dqp) {
 284		trace_xfs_dqattach_found(dqp);
 285		return 0;
 286	}
 287
 288	/*
 289	 * Find the dquot from somewhere. This bumps the reference count of
 290	 * dquot and returns it locked.  This can return ENOENT if dquot didn't
 291	 * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 292	 * turned off suddenly.
 293	 */
 294	error = xfs_qm_dqget(ip->i_mount, ip, id, type,
 295			     doalloc | XFS_QMOPT_DOWARN, &dqp);
 296	if (error)
 297		return error;
 298
 299	trace_xfs_dqattach_get(dqp);
 300
 301	/*
 302	 * dqget may have dropped and re-acquired the ilock, but it guarantees
 303	 * that the dquot returned is the one that should go in the inode.
 304	 */
 305	*IO_idqpp = dqp;
 306	xfs_dqunlock(dqp);
 307	return 0;
 308}
 309
 310static bool
 311xfs_qm_need_dqattach(
 312	struct xfs_inode	*ip)
 313{
 314	struct xfs_mount	*mp = ip->i_mount;
 315
 316	if (!XFS_IS_QUOTA_RUNNING(mp))
 317		return false;
 318	if (!XFS_IS_QUOTA_ON(mp))
 319		return false;
 320	if (!XFS_NOT_DQATTACHED(mp, ip))
 321		return false;
 322	if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 323		return false;
 324	return true;
 325}
 326
 327/*
 328 * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 329 * into account.
 330 * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 331 * Inode may get unlocked and relocked in here, and the caller must deal with
 332 * the consequences.
 333 */
 334int
 335xfs_qm_dqattach_locked(
 336	xfs_inode_t	*ip,
 337	uint		flags)
 338{
 339	xfs_mount_t	*mp = ip->i_mount;
 340	int		error = 0;
 341
 342	if (!xfs_qm_need_dqattach(ip))
 343		return 0;
 344
 345	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 346
 347	if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 348		error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 349						flags & XFS_QMOPT_DQALLOC,
 350						&ip->i_udquot);
 351		if (error)
 352			goto done;
 353		ASSERT(ip->i_udquot);
 354	}
 355
 356	if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 357		error = xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 358						flags & XFS_QMOPT_DQALLOC,
 359						&ip->i_gdquot);
 360		if (error)
 361			goto done;
 362		ASSERT(ip->i_gdquot);
 363	}
 364
 365	if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 366		error = xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 367						flags & XFS_QMOPT_DQALLOC,
 368						&ip->i_pdquot);
 369		if (error)
 370			goto done;
 371		ASSERT(ip->i_pdquot);
 372	}
 373
 374done:
 375	/*
 376	 * Don't worry about the dquots that we may have attached before any
 377	 * error - they'll get detached later if it has not already been done.
 378	 */
 379	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 380	return error;
 381}
 382
 383int
 384xfs_qm_dqattach(
 385	struct xfs_inode	*ip,
 386	uint			flags)
 387{
 388	int			error;
 389
 390	if (!xfs_qm_need_dqattach(ip))
 391		return 0;
 392
 393	xfs_ilock(ip, XFS_ILOCK_EXCL);
 394	error = xfs_qm_dqattach_locked(ip, flags);
 395	xfs_iunlock(ip, XFS_ILOCK_EXCL);
 396
 397	return error;
 398}
 399
 400/*
 401 * Release dquots (and their references) if any.
 402 * The inode should be locked EXCL except when this's called by
 403 * xfs_ireclaim.
 404 */
 405void
 406xfs_qm_dqdetach(
 407	xfs_inode_t	*ip)
 408{
 409	if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 410		return;
 411
 412	trace_xfs_dquot_dqdetach(ip);
 413
 414	ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 415	if (ip->i_udquot) {
 416		xfs_qm_dqrele(ip->i_udquot);
 417		ip->i_udquot = NULL;
 418	}
 419	if (ip->i_gdquot) {
 420		xfs_qm_dqrele(ip->i_gdquot);
 421		ip->i_gdquot = NULL;
 422	}
 423	if (ip->i_pdquot) {
 424		xfs_qm_dqrele(ip->i_pdquot);
 425		ip->i_pdquot = NULL;
 426	}
 427}
 428
 429struct xfs_qm_isolate {
 430	struct list_head	buffers;
 431	struct list_head	dispose;
 432};
 433
 434static enum lru_status
 435xfs_qm_dquot_isolate(
 436	struct list_head	*item,
 437	struct list_lru_one	*lru,
 438	spinlock_t		*lru_lock,
 439	void			*arg)
 440		__releases(lru_lock) __acquires(lru_lock)
 441{
 442	struct xfs_dquot	*dqp = container_of(item,
 443						struct xfs_dquot, q_lru);
 444	struct xfs_qm_isolate	*isol = arg;
 445
 446	if (!xfs_dqlock_nowait(dqp))
 447		goto out_miss_busy;
 448
 449	/*
 450	 * This dquot has acquired a reference in the meantime remove it from
 451	 * the freelist and try again.
 452	 */
 453	if (dqp->q_nrefs) {
 454		xfs_dqunlock(dqp);
 455		XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 456
 457		trace_xfs_dqreclaim_want(dqp);
 458		list_lru_isolate(lru, &dqp->q_lru);
 459		XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 460		return LRU_REMOVED;
 461	}
 462
 463	/*
 464	 * If the dquot is dirty, flush it. If it's already being flushed, just
 465	 * skip it so there is time for the IO to complete before we try to
 466	 * reclaim it again on the next LRU pass.
 467	 */
 468	if (!xfs_dqflock_nowait(dqp)) {
 469		xfs_dqunlock(dqp);
 470		goto out_miss_busy;
 471	}
 472
 473	if (XFS_DQ_IS_DIRTY(dqp)) {
 474		struct xfs_buf	*bp = NULL;
 475		int		error;
 476
 477		trace_xfs_dqreclaim_dirty(dqp);
 478
 479		/* we have to drop the LRU lock to flush the dquot */
 480		spin_unlock(lru_lock);
 481
 482		error = xfs_qm_dqflush(dqp, &bp);
 483		if (error) {
 484			xfs_warn(dqp->q_mount, "%s: dquot %p flush failed",
 485				 __func__, dqp);
 486			goto out_unlock_dirty;
 487		}
 488
 489		xfs_buf_delwri_queue(bp, &isol->buffers);
 490		xfs_buf_relse(bp);
 491		goto out_unlock_dirty;
 492	}
 493	xfs_dqfunlock(dqp);
 494
 495	/*
 496	 * Prevent lookups now that we are past the point of no return.
 497	 */
 498	dqp->dq_flags |= XFS_DQ_FREEING;
 499	xfs_dqunlock(dqp);
 500
 501	ASSERT(dqp->q_nrefs == 0);
 502	list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 503	XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 504	trace_xfs_dqreclaim_done(dqp);
 505	XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
 506	return LRU_REMOVED;
 507
 508out_miss_busy:
 509	trace_xfs_dqreclaim_busy(dqp);
 510	XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 511	return LRU_SKIP;
 512
 513out_unlock_dirty:
 514	trace_xfs_dqreclaim_busy(dqp);
 515	XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 516	xfs_dqunlock(dqp);
 517	spin_lock(lru_lock);
 518	return LRU_RETRY;
 519}
 520
 521static unsigned long
 522xfs_qm_shrink_scan(
 523	struct shrinker		*shrink,
 524	struct shrink_control	*sc)
 525{
 526	struct xfs_quotainfo	*qi = container_of(shrink,
 527					struct xfs_quotainfo, qi_shrinker);
 528	struct xfs_qm_isolate	isol;
 529	unsigned long		freed;
 530	int			error;
 531
 532	if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 533		return 0;
 534
 535	INIT_LIST_HEAD(&isol.buffers);
 536	INIT_LIST_HEAD(&isol.dispose);
 537
 538	freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 539				     xfs_qm_dquot_isolate, &isol);
 540
 541	error = xfs_buf_delwri_submit(&isol.buffers);
 542	if (error)
 543		xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 544
 545	while (!list_empty(&isol.dispose)) {
 546		struct xfs_dquot	*dqp;
 547
 548		dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 549		list_del_init(&dqp->q_lru);
 550		xfs_qm_dqfree_one(dqp);
 551	}
 552
 553	return freed;
 554}
 555
 556static unsigned long
 557xfs_qm_shrink_count(
 558	struct shrinker		*shrink,
 559	struct shrink_control	*sc)
 560{
 561	struct xfs_quotainfo	*qi = container_of(shrink,
 562					struct xfs_quotainfo, qi_shrinker);
 563
 564	return list_lru_shrink_count(&qi->qi_lru, sc);
 565}
 566
 567STATIC void
 568xfs_qm_set_defquota(
 569	xfs_mount_t	*mp,
 570	uint		type,
 571	xfs_quotainfo_t	*qinf)
 572{
 573	xfs_dquot_t		*dqp;
 574	struct xfs_def_quota    *defq;
 575	int			error;
 576
 577	error = xfs_qm_dqread(mp, 0, type, XFS_QMOPT_DOWARN, &dqp);
 578
 579	if (!error) {
 580		xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 581
 582		defq = xfs_get_defquota(dqp, qinf);
 583
 584		/*
 585		 * Timers and warnings have been already set, let's just set the
 586		 * default limits for this quota type
 587		 */
 588		defq->bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 589		defq->bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 590		defq->ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 591		defq->isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 592		defq->rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 593		defq->rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 594		xfs_qm_dqdestroy(dqp);
 595	}
 596}
 597
 598/*
 599 * This initializes all the quota information that's kept in the
 600 * mount structure
 601 */
 602STATIC int
 603xfs_qm_init_quotainfo(
 604	xfs_mount_t	*mp)
 605{
 606	xfs_quotainfo_t *qinf;
 607	int		error;
 608	xfs_dquot_t	*dqp;
 609
 610	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 611
 612	qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 613
 614	error = list_lru_init(&qinf->qi_lru);
 615	if (error)
 616		goto out_free_qinf;
 617
 618	/*
 619	 * See if quotainodes are setup, and if not, allocate them,
 620	 * and change the superblock accordingly.
 621	 */
 622	error = xfs_qm_init_quotainos(mp);
 623	if (error)
 624		goto out_free_lru;
 625
 626	INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 627	INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 628	INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 629	mutex_init(&qinf->qi_tree_lock);
 630
 631	/* mutex used to serialize quotaoffs */
 632	mutex_init(&qinf->qi_quotaofflock);
 633
 634	/* Precalc some constants */
 635	qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 636	qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 637
 638	mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 639
 640	/*
 641	 * We try to get the limits from the superuser's limits fields.
 642	 * This is quite hacky, but it is standard quota practice.
 643	 *
 644	 * Since we may not have done a quotacheck by this point, just read
 645	 * the dquot without attaching it to any hashtables or lists.
 646	 *
 647	 * Timers and warnings are globally set by the first timer found in
 648	 * user/group/proj quota types, otherwise a default value is used.
 649	 * This should be split into different fields per quota type.
 650	 */
 651	error = xfs_qm_dqread(mp, 0,
 652			XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 653			 (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 654			  XFS_DQ_PROJ),
 655			XFS_QMOPT_DOWARN, &dqp);
 656
 657	if (!error) {
 658		xfs_disk_dquot_t	*ddqp = &dqp->q_core;
 659
 660		/*
 661		 * The warnings and timers set the grace period given to
 662		 * a user or group before he or she can not perform any
 663		 * more writing. If it is zero, a default is used.
 664		 */
 665		qinf->qi_btimelimit = ddqp->d_btimer ?
 666			be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 667		qinf->qi_itimelimit = ddqp->d_itimer ?
 668			be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 669		qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 670			be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 671		qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 672			be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 673		qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 674			be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 675		qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 676			be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 677		xfs_qm_dqdestroy(dqp);
 678	} else {
 679		qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 680		qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 681		qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 682		qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 683		qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 684		qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 685	}
 686
 687	if (XFS_IS_UQUOTA_RUNNING(mp))
 688		xfs_qm_set_defquota(mp, XFS_DQ_USER, qinf);
 689	if (XFS_IS_GQUOTA_RUNNING(mp))
 690		xfs_qm_set_defquota(mp, XFS_DQ_GROUP, qinf);
 691	if (XFS_IS_PQUOTA_RUNNING(mp))
 692		xfs_qm_set_defquota(mp, XFS_DQ_PROJ, qinf);
 693
 694	qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 695	qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 696	qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 697	qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 698	register_shrinker(&qinf->qi_shrinker);
 699	return 0;
 700
 701out_free_lru:
 702	list_lru_destroy(&qinf->qi_lru);
 703out_free_qinf:
 704	kmem_free(qinf);
 705	mp->m_quotainfo = NULL;
 706	return error;
 707}
 708
 709
 710/*
 711 * Gets called when unmounting a filesystem or when all quotas get
 712 * turned off.
 713 * This purges the quota inodes, destroys locks and frees itself.
 714 */
 715void
 716xfs_qm_destroy_quotainfo(
 717	xfs_mount_t	*mp)
 718{
 719	xfs_quotainfo_t *qi;
 720
 721	qi = mp->m_quotainfo;
 722	ASSERT(qi != NULL);
 723
 724	unregister_shrinker(&qi->qi_shrinker);
 725	list_lru_destroy(&qi->qi_lru);
 726
 727	if (qi->qi_uquotaip) {
 728		IRELE(qi->qi_uquotaip);
 729		qi->qi_uquotaip = NULL; /* paranoia */
 730	}
 731	if (qi->qi_gquotaip) {
 732		IRELE(qi->qi_gquotaip);
 733		qi->qi_gquotaip = NULL;
 734	}
 735	if (qi->qi_pquotaip) {
 736		IRELE(qi->qi_pquotaip);
 737		qi->qi_pquotaip = NULL;
 738	}
 739	mutex_destroy(&qi->qi_quotaofflock);
 740	kmem_free(qi);
 741	mp->m_quotainfo = NULL;
 742}
 743
 744/*
 745 * Create an inode and return with a reference already taken, but unlocked
 746 * This is how we create quota inodes
 747 */
 748STATIC int
 749xfs_qm_qino_alloc(
 750	xfs_mount_t	*mp,
 751	xfs_inode_t	**ip,
 752	uint		flags)
 753{
 754	xfs_trans_t	*tp;
 755	int		error;
 756	int		committed;
 757	bool		need_alloc = true;
 758
 759	*ip = NULL;
 760	/*
 761	 * With superblock that doesn't have separate pquotino, we
 762	 * share an inode between gquota and pquota. If the on-disk
 763	 * superblock has GQUOTA and the filesystem is now mounted
 764	 * with PQUOTA, just use sb_gquotino for sb_pquotino and
 765	 * vice-versa.
 766	 */
 767	if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 768			(flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 769		xfs_ino_t ino = NULLFSINO;
 770
 771		if ((flags & XFS_QMOPT_PQUOTA) &&
 772			     (mp->m_sb.sb_gquotino != NULLFSINO)) {
 773			ino = mp->m_sb.sb_gquotino;
 774			ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
 775		} else if ((flags & XFS_QMOPT_GQUOTA) &&
 776			     (mp->m_sb.sb_pquotino != NULLFSINO)) {
 777			ino = mp->m_sb.sb_pquotino;
 778			ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
 779		}
 780		if (ino != NULLFSINO) {
 781			error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 782			if (error)
 783				return error;
 784			mp->m_sb.sb_gquotino = NULLFSINO;
 785			mp->m_sb.sb_pquotino = NULLFSINO;
 786			need_alloc = false;
 787		}
 788	}
 789
 790	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
 791			XFS_QM_QINOCREATE_SPACE_RES(mp), 0, 0, &tp);
 792	if (error)
 793		return error;
 794
 795	if (need_alloc) {
 796		error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
 797								&committed);
 798		if (error) {
 799			xfs_trans_cancel(tp);
 800			return error;
 801		}
 802	}
 803
 804	/*
 805	 * Make the changes in the superblock, and log those too.
 806	 * sbfields arg may contain fields other than *QUOTINO;
 807	 * VERSIONNUM for example.
 808	 */
 809	spin_lock(&mp->m_sb_lock);
 810	if (flags & XFS_QMOPT_SBVERSION) {
 811		ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 812
 813		xfs_sb_version_addquota(&mp->m_sb);
 814		mp->m_sb.sb_uquotino = NULLFSINO;
 815		mp->m_sb.sb_gquotino = NULLFSINO;
 816		mp->m_sb.sb_pquotino = NULLFSINO;
 817
 818		/* qflags will get updated fully _after_ quotacheck */
 819		mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 820	}
 821	if (flags & XFS_QMOPT_UQUOTA)
 822		mp->m_sb.sb_uquotino = (*ip)->i_ino;
 823	else if (flags & XFS_QMOPT_GQUOTA)
 824		mp->m_sb.sb_gquotino = (*ip)->i_ino;
 825	else
 826		mp->m_sb.sb_pquotino = (*ip)->i_ino;
 827	spin_unlock(&mp->m_sb_lock);
 828	xfs_log_sb(tp);
 829
 830	error = xfs_trans_commit(tp);
 831	if (error) {
 832		ASSERT(XFS_FORCED_SHUTDOWN(mp));
 833		xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 834	}
 835	if (need_alloc)
 836		xfs_finish_inode_setup(*ip);
 837	return error;
 838}
 839
 840
 841STATIC void
 842xfs_qm_reset_dqcounts(
 843	xfs_mount_t	*mp,
 844	xfs_buf_t	*bp,
 845	xfs_dqid_t	id,
 846	uint		type)
 847{
 848	struct xfs_dqblk	*dqb;
 849	int			j;
 850
 851	trace_xfs_reset_dqcounts(bp, _RET_IP_);
 852
 853	/*
 854	 * Reset all counters and timers. They'll be
 855	 * started afresh by xfs_qm_quotacheck.
 856	 */
 857#ifdef DEBUG
 858	j = (int)XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
 859		sizeof(xfs_dqblk_t);
 860	ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 861#endif
 862	dqb = bp->b_addr;
 863	for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 864		struct xfs_disk_dquot	*ddq;
 865
 866		ddq = (struct xfs_disk_dquot *)&dqb[j];
 867
 868		/*
 869		 * Do a sanity check, and if needed, repair the dqblk. Don't
 870		 * output any warnings because it's perfectly possible to
 871		 * find uninitialised dquot blks. See comment in xfs_dqcheck.
 872		 */
 873		xfs_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 874			    "xfs_quotacheck");
 875		/*
 876		 * Reset type in case we are reusing group quota file for
 877		 * project quotas or vice versa
 878		 */
 879		ddq->d_flags = type;
 880		ddq->d_bcount = 0;
 881		ddq->d_icount = 0;
 882		ddq->d_rtbcount = 0;
 883		ddq->d_btimer = 0;
 884		ddq->d_itimer = 0;
 885		ddq->d_rtbtimer = 0;
 886		ddq->d_bwarns = 0;
 887		ddq->d_iwarns = 0;
 888		ddq->d_rtbwarns = 0;
 889
 890		if (xfs_sb_version_hascrc(&mp->m_sb)) {
 891			xfs_update_cksum((char *)&dqb[j],
 892					 sizeof(struct xfs_dqblk),
 893					 XFS_DQUOT_CRC_OFF);
 894		}
 895	}
 896}
 897
 898STATIC int
 899xfs_qm_dqiter_bufs(
 900	struct xfs_mount	*mp,
 901	xfs_dqid_t		firstid,
 902	xfs_fsblock_t		bno,
 903	xfs_filblks_t		blkcnt,
 904	uint			flags,
 905	struct list_head	*buffer_list)
 906{
 907	struct xfs_buf		*bp;
 908	int			error;
 909	int			type;
 910
 911	ASSERT(blkcnt > 0);
 912	type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 913		(flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 914	error = 0;
 915
 916	/*
 917	 * Blkcnt arg can be a very big number, and might even be
 918	 * larger than the log itself. So, we have to break it up into
 919	 * manageable-sized transactions.
 920	 * Note that we don't start a permanent transaction here; we might
 921	 * not be able to get a log reservation for the whole thing up front,
 922	 * and we don't really care to either, because we just discard
 923	 * everything if we were to crash in the middle of this loop.
 924	 */
 925	while (blkcnt--) {
 926		error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 927			      XFS_FSB_TO_DADDR(mp, bno),
 928			      mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 929			      &xfs_dquot_buf_ops);
 930
 931		/*
 932		 * CRC and validation errors will return a EFSCORRUPTED here. If
 933		 * this occurs, re-read without CRC validation so that we can
 934		 * repair the damage via xfs_qm_reset_dqcounts(). This process
 935		 * will leave a trace in the log indicating corruption has
 936		 * been detected.
 937		 */
 938		if (error == -EFSCORRUPTED) {
 939			error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 940				      XFS_FSB_TO_DADDR(mp, bno),
 941				      mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 942				      NULL);
 943		}
 944
 945		if (error)
 946			break;
 947
 948		/*
 949		 * A corrupt buffer might not have a verifier attached, so
 950		 * make sure we have the correct one attached before writeback
 951		 * occurs.
 952		 */
 953		bp->b_ops = &xfs_dquot_buf_ops;
 954		xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 955		xfs_buf_delwri_queue(bp, buffer_list);
 956		xfs_buf_relse(bp);
 957
 958		/* goto the next block. */
 959		bno++;
 960		firstid += mp->m_quotainfo->qi_dqperchunk;
 961	}
 962
 963	return error;
 964}
 965
 966/*
 967 * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 968 * caller supplied function for every chunk of dquots that we find.
 969 */
 970STATIC int
 971xfs_qm_dqiterate(
 972	struct xfs_mount	*mp,
 973	struct xfs_inode	*qip,
 974	uint			flags,
 975	struct list_head	*buffer_list)
 976{
 977	struct xfs_bmbt_irec	*map;
 978	int			i, nmaps;	/* number of map entries */
 979	int			error;		/* return value */
 980	xfs_fileoff_t		lblkno;
 981	xfs_filblks_t		maxlblkcnt;
 982	xfs_dqid_t		firstid;
 983	xfs_fsblock_t		rablkno;
 984	xfs_filblks_t		rablkcnt;
 985
 986	error = 0;
 987	/*
 988	 * This looks racy, but we can't keep an inode lock across a
 989	 * trans_reserve. But, this gets called during quotacheck, and that
 990	 * happens only at mount time which is single threaded.
 991	 */
 992	if (qip->i_d.di_nblocks == 0)
 993		return 0;
 994
 995	map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 996
 997	lblkno = 0;
 998	maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 999	do {
1000		uint		lock_mode;
1001
1002		nmaps = XFS_DQITER_MAP_SIZE;
1003		/*
1004		 * We aren't changing the inode itself. Just changing
1005		 * some of its data. No new blocks are added here, and
1006		 * the inode is never added to the transaction.
1007		 */
1008		lock_mode = xfs_ilock_data_map_shared(qip);
1009		error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
1010				       map, &nmaps, 0);
1011		xfs_iunlock(qip, lock_mode);
1012		if (error)
1013			break;
1014
1015		ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1016		for (i = 0; i < nmaps; i++) {
1017			ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1018			ASSERT(map[i].br_blockcount);
1019
1020
1021			lblkno += map[i].br_blockcount;
1022
1023			if (map[i].br_startblock == HOLESTARTBLOCK)
1024				continue;
1025
1026			firstid = (xfs_dqid_t) map[i].br_startoff *
1027				mp->m_quotainfo->qi_dqperchunk;
1028			/*
1029			 * Do a read-ahead on the next extent.
1030			 */
1031			if ((i+1 < nmaps) &&
1032			    (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1033				rablkcnt =  map[i+1].br_blockcount;
1034				rablkno = map[i+1].br_startblock;
1035				while (rablkcnt--) {
1036					xfs_buf_readahead(mp->m_ddev_targp,
1037					       XFS_FSB_TO_DADDR(mp, rablkno),
1038					       mp->m_quotainfo->qi_dqchunklen,
1039					       &xfs_dquot_buf_ops);
1040					rablkno++;
1041				}
1042			}
1043			/*
1044			 * Iterate thru all the blks in the extent and
1045			 * reset the counters of all the dquots inside them.
1046			 */
1047			error = xfs_qm_dqiter_bufs(mp, firstid,
1048						   map[i].br_startblock,
1049						   map[i].br_blockcount,
1050						   flags, buffer_list);
1051			if (error)
1052				goto out;
1053		}
1054	} while (nmaps > 0);
1055
1056out:
1057	kmem_free(map);
1058	return error;
1059}
1060
1061/*
1062 * Called by dqusage_adjust in doing a quotacheck.
1063 *
1064 * Given the inode, and a dquot id this updates both the incore dqout as well
1065 * as the buffer copy. This is so that once the quotacheck is done, we can
1066 * just log all the buffers, as opposed to logging numerous updates to
1067 * individual dquots.
1068 */
1069STATIC int
1070xfs_qm_quotacheck_dqadjust(
1071	struct xfs_inode	*ip,
1072	xfs_dqid_t		id,
1073	uint			type,
1074	xfs_qcnt_t		nblks,
1075	xfs_qcnt_t		rtblks)
1076{
1077	struct xfs_mount	*mp = ip->i_mount;
1078	struct xfs_dquot	*dqp;
1079	int			error;
1080
1081	error = xfs_qm_dqget(mp, ip, id, type,
1082			     XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1083	if (error) {
1084		/*
1085		 * Shouldn't be able to turn off quotas here.
1086		 */
1087		ASSERT(error != -ESRCH);
1088		ASSERT(error != -ENOENT);
1089		return error;
1090	}
1091
1092	trace_xfs_dqadjust(dqp);
1093
1094	/*
1095	 * Adjust the inode count and the block count to reflect this inode's
1096	 * resource usage.
1097	 */
1098	be64_add_cpu(&dqp->q_core.d_icount, 1);
1099	dqp->q_res_icount++;
1100	if (nblks) {
1101		be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1102		dqp->q_res_bcount += nblks;
1103	}
1104	if (rtblks) {
1105		be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1106		dqp->q_res_rtbcount += rtblks;
1107	}
1108
1109	/*
1110	 * Set default limits, adjust timers (since we changed usages)
1111	 *
1112	 * There are no timers for the default values set in the root dquot.
1113	 */
1114	if (dqp->q_core.d_id) {
1115		xfs_qm_adjust_dqlimits(mp, dqp);
1116		xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1117	}
1118
1119	dqp->dq_flags |= XFS_DQ_DIRTY;
1120	xfs_qm_dqput(dqp);
1121	return 0;
1122}
1123
1124/*
1125 * callback routine supplied to bulkstat(). Given an inumber, find its
1126 * dquots and update them to account for resources taken by that inode.
1127 */
1128/* ARGSUSED */
1129STATIC int
1130xfs_qm_dqusage_adjust(
1131	xfs_mount_t	*mp,		/* mount point for filesystem */
1132	xfs_ino_t	ino,		/* inode number to get data for */
1133	void		__user *buffer,	/* not used */
1134	int		ubsize,		/* not used */
1135	int		*ubused,	/* not used */
1136	int		*res)		/* result code value */
1137{
1138	xfs_inode_t	*ip;
1139	xfs_qcnt_t	nblks;
1140	xfs_filblks_t	rtblks = 0;	/* total rt blks */
1141	int		error;
1142
1143	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1144
1145	/*
1146	 * rootino must have its resources accounted for, not so with the quota
1147	 * inodes.
1148	 */
1149	if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1150		*res = BULKSTAT_RV_NOTHING;
1151		return -EINVAL;
1152	}
1153
1154	/*
1155	 * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1156	 * interface expects the inode to be exclusively locked because that's
1157	 * the case in all other instances. It's OK that we do this because
1158	 * quotacheck is done only at mount time.
1159	 */
1160	error = xfs_iget(mp, NULL, ino, XFS_IGET_DONTCACHE, XFS_ILOCK_EXCL,
1161			 &ip);
1162	if (error) {
1163		*res = BULKSTAT_RV_NOTHING;
1164		return error;
1165	}
1166
1167	ASSERT(ip->i_delayed_blks == 0);
1168
1169	if (XFS_IS_REALTIME_INODE(ip)) {
1170		struct xfs_ifork	*ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1171
1172		if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1173			error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
1174			if (error)
1175				goto error0;
1176		}
1177
1178		xfs_bmap_count_leaves(ifp, &rtblks);
1179	}
1180
1181	nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1182
1183	/*
1184	 * Add the (disk blocks and inode) resources occupied by this
1185	 * inode to its dquots. We do this adjustment in the incore dquot,
1186	 * and also copy the changes to its buffer.
1187	 * We don't care about putting these changes in a transaction
1188	 * envelope because if we crash in the middle of a 'quotacheck'
1189	 * we have to start from the beginning anyway.
1190	 * Once we're done, we'll log all the dquot bufs.
1191	 *
1192	 * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1193	 * and quotaoffs don't race. (Quotachecks happen at mount time only).
1194	 */
1195	if (XFS_IS_UQUOTA_ON(mp)) {
1196		error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1197						   XFS_DQ_USER, nblks, rtblks);
1198		if (error)
1199			goto error0;
1200	}
1201
1202	if (XFS_IS_GQUOTA_ON(mp)) {
1203		error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1204						   XFS_DQ_GROUP, nblks, rtblks);
1205		if (error)
1206			goto error0;
1207	}
1208
1209	if (XFS_IS_PQUOTA_ON(mp)) {
1210		error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1211						   XFS_DQ_PROJ, nblks, rtblks);
1212		if (error)
1213			goto error0;
1214	}
1215
1216	xfs_iunlock(ip, XFS_ILOCK_EXCL);
1217	IRELE(ip);
1218	*res = BULKSTAT_RV_DIDONE;
1219	return 0;
1220
1221error0:
1222	xfs_iunlock(ip, XFS_ILOCK_EXCL);
1223	IRELE(ip);
1224	*res = BULKSTAT_RV_GIVEUP;
1225	return error;
1226}
1227
1228STATIC int
1229xfs_qm_flush_one(
1230	struct xfs_dquot	*dqp,
1231	void			*data)
1232{
1233	struct xfs_mount	*mp = dqp->q_mount;
1234	struct list_head	*buffer_list = data;
1235	struct xfs_buf		*bp = NULL;
1236	int			error = 0;
1237
1238	xfs_dqlock(dqp);
1239	if (dqp->dq_flags & XFS_DQ_FREEING)
1240		goto out_unlock;
1241	if (!XFS_DQ_IS_DIRTY(dqp))
1242		goto out_unlock;
1243
1244	/*
1245	 * The only way the dquot is already flush locked by the time quotacheck
1246	 * gets here is if reclaim flushed it before the dqadjust walk dirtied
1247	 * it for the final time. Quotacheck collects all dquot bufs in the
1248	 * local delwri queue before dquots are dirtied, so reclaim can't have
1249	 * possibly queued it for I/O. The only way out is to push the buffer to
1250	 * cycle the flush lock.
1251	 */
1252	if (!xfs_dqflock_nowait(dqp)) {
1253		/* buf is pinned in-core by delwri list */
1254		DEFINE_SINGLE_BUF_MAP(map, dqp->q_blkno,
1255				      mp->m_quotainfo->qi_dqchunklen);
1256		bp = _xfs_buf_find(mp->m_ddev_targp, &map, 1, 0, NULL);
1257		if (!bp) {
1258			error = -EINVAL;
1259			goto out_unlock;
1260		}
1261		xfs_buf_unlock(bp);
1262
1263		xfs_buf_delwri_pushbuf(bp, buffer_list);
1264		xfs_buf_rele(bp);
1265
1266		error = -EAGAIN;
1267		goto out_unlock;
1268	}
1269
1270	error = xfs_qm_dqflush(dqp, &bp);
1271	if (error)
1272		goto out_unlock;
1273
1274	xfs_buf_delwri_queue(bp, buffer_list);
1275	xfs_buf_relse(bp);
1276out_unlock:
1277	xfs_dqunlock(dqp);
1278	return error;
1279}
1280
1281/*
1282 * Walk thru all the filesystem inodes and construct a consistent view
1283 * of the disk quota world. If the quotacheck fails, disable quotas.
1284 */
1285STATIC int
1286xfs_qm_quotacheck(
1287	xfs_mount_t	*mp)
1288{
1289	int			done, count, error, error2;
1290	xfs_ino_t		lastino;
1291	size_t			structsz;
1292	uint			flags;
1293	LIST_HEAD		(buffer_list);
1294	struct xfs_inode	*uip = mp->m_quotainfo->qi_uquotaip;
1295	struct xfs_inode	*gip = mp->m_quotainfo->qi_gquotaip;
1296	struct xfs_inode	*pip = mp->m_quotainfo->qi_pquotaip;
1297
1298	count = INT_MAX;
1299	structsz = 1;
1300	lastino = 0;
1301	flags = 0;
1302
1303	ASSERT(uip || gip || pip);
1304	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1305
1306	xfs_notice(mp, "Quotacheck needed: Please wait.");
1307
1308	/*
1309	 * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1310	 * their counters to zero. We need a clean slate.
1311	 * We don't log our changes till later.
1312	 */
1313	if (uip) {
1314		error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1315					 &buffer_list);
1316		if (error)
1317			goto error_return;
1318		flags |= XFS_UQUOTA_CHKD;
1319	}
1320
1321	if (gip) {
1322		error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1323					 &buffer_list);
1324		if (error)
1325			goto error_return;
1326		flags |= XFS_GQUOTA_CHKD;
1327	}
1328
1329	if (pip) {
1330		error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1331					 &buffer_list);
1332		if (error)
1333			goto error_return;
1334		flags |= XFS_PQUOTA_CHKD;
1335	}
1336
1337	do {
1338		/*
1339		 * Iterate thru all the inodes in the file system,
1340		 * adjusting the corresponding dquot counters in core.
1341		 */
1342		error = xfs_bulkstat(mp, &lastino, &count,
1343				     xfs_qm_dqusage_adjust,
1344				     structsz, NULL, &done);
1345		if (error)
1346			break;
1347
1348	} while (!done);
1349
1350	/*
1351	 * We've made all the changes that we need to make incore.  Flush them
1352	 * down to disk buffers if everything was updated successfully.
1353	 */
1354	if (XFS_IS_UQUOTA_ON(mp)) {
1355		error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1356					  &buffer_list);
1357	}
1358	if (XFS_IS_GQUOTA_ON(mp)) {
1359		error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1360					   &buffer_list);
1361		if (!error)
1362			error = error2;
1363	}
1364	if (XFS_IS_PQUOTA_ON(mp)) {
1365		error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1366					   &buffer_list);
1367		if (!error)
1368			error = error2;
1369	}
1370
1371	error2 = xfs_buf_delwri_submit(&buffer_list);
1372	if (!error)
1373		error = error2;
1374
1375	/*
1376	 * We can get this error if we couldn't do a dquot allocation inside
1377	 * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1378	 * dirty dquots that might be cached, we just want to get rid of them
1379	 * and turn quotaoff. The dquots won't be attached to any of the inodes
1380	 * at this point (because we intentionally didn't in dqget_noattach).
1381	 */
1382	if (error) {
1383		xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1384		goto error_return;
1385	}
1386
1387	/*
1388	 * If one type of quotas is off, then it will lose its
1389	 * quotachecked status, since we won't be doing accounting for
1390	 * that type anymore.
1391	 */
1392	mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1393	mp->m_qflags |= flags;
1394
1395 error_return:
1396	xfs_buf_delwri_cancel(&buffer_list);
1397
1398	if (error) {
1399		xfs_warn(mp,
1400	"Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1401			error);
1402		/*
1403		 * We must turn off quotas.
1404		 */
1405		ASSERT(mp->m_quotainfo != NULL);
1406		xfs_qm_destroy_quotainfo(mp);
1407		if (xfs_mount_reset_sbqflags(mp)) {
1408			xfs_warn(mp,
1409				"Quotacheck: Failed to reset quota flags.");
1410		}
1411	} else
1412		xfs_notice(mp, "Quotacheck: Done.");
1413	return error;
1414}
1415
1416/*
1417 * This is called from xfs_mountfs to start quotas and initialize all
1418 * necessary data structures like quotainfo.  This is also responsible for
1419 * running a quotacheck as necessary.  We are guaranteed that the superblock
1420 * is consistently read in at this point.
1421 *
1422 * If we fail here, the mount will continue with quota turned off. We don't
1423 * need to inidicate success or failure at all.
1424 */
1425void
1426xfs_qm_mount_quotas(
1427	struct xfs_mount	*mp)
1428{
1429	int			error = 0;
1430	uint			sbf;
1431
1432	/*
1433	 * If quotas on realtime volumes is not supported, we disable
1434	 * quotas immediately.
1435	 */
1436	if (mp->m_sb.sb_rextents) {
1437		xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1438		mp->m_qflags = 0;
1439		goto write_changes;
1440	}
1441
1442	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1443
1444	/*
1445	 * Allocate the quotainfo structure inside the mount struct, and
1446	 * create quotainode(s), and change/rev superblock if necessary.
1447	 */
1448	error = xfs_qm_init_quotainfo(mp);
1449	if (error) {
1450		/*
1451		 * We must turn off quotas.
1452		 */
1453		ASSERT(mp->m_quotainfo == NULL);
1454		mp->m_qflags = 0;
1455		goto write_changes;
1456	}
1457	/*
1458	 * If any of the quotas are not consistent, do a quotacheck.
1459	 */
1460	if (XFS_QM_NEED_QUOTACHECK(mp)) {
1461		error = xfs_qm_quotacheck(mp);
1462		if (error) {
1463			/* Quotacheck failed and disabled quotas. */
1464			return;
1465		}
1466	}
1467	/*
1468	 * If one type of quotas is off, then it will lose its
1469	 * quotachecked status, since we won't be doing accounting for
1470	 * that type anymore.
1471	 */
1472	if (!XFS_IS_UQUOTA_ON(mp))
1473		mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1474	if (!XFS_IS_GQUOTA_ON(mp))
1475		mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1476	if (!XFS_IS_PQUOTA_ON(mp))
1477		mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1478
1479 write_changes:
1480	/*
1481	 * We actually don't have to acquire the m_sb_lock at all.
1482	 * This can only be called from mount, and that's single threaded. XXX
1483	 */
1484	spin_lock(&mp->m_sb_lock);
1485	sbf = mp->m_sb.sb_qflags;
1486	mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1487	spin_unlock(&mp->m_sb_lock);
1488
1489	if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1490		if (xfs_sync_sb(mp, false)) {
1491			/*
1492			 * We could only have been turning quotas off.
1493			 * We aren't in very good shape actually because
1494			 * the incore structures are convinced that quotas are
1495			 * off, but the on disk superblock doesn't know that !
1496			 */
1497			ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1498			xfs_alert(mp, "%s: Superblock update failed!",
1499				__func__);
1500		}
1501	}
1502
1503	if (error) {
1504		xfs_warn(mp, "Failed to initialize disk quotas.");
1505		return;
1506	}
1507}
1508
1509/*
1510 * This is called after the superblock has been read in and we're ready to
1511 * iget the quota inodes.
1512 */
1513STATIC int
1514xfs_qm_init_quotainos(
1515	xfs_mount_t	*mp)
1516{
1517	struct xfs_inode	*uip = NULL;
1518	struct xfs_inode	*gip = NULL;
1519	struct xfs_inode	*pip = NULL;
1520	int			error;
1521	uint			flags = 0;
1522
1523	ASSERT(mp->m_quotainfo);
1524
1525	/*
1526	 * Get the uquota and gquota inodes
1527	 */
1528	if (xfs_sb_version_hasquota(&mp->m_sb)) {
1529		if (XFS_IS_UQUOTA_ON(mp) &&
1530		    mp->m_sb.sb_uquotino != NULLFSINO) {
1531			ASSERT(mp->m_sb.sb_uquotino > 0);
1532			error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1533					     0, 0, &uip);
1534			if (error)
1535				return error;
1536		}
1537		if (XFS_IS_GQUOTA_ON(mp) &&
1538		    mp->m_sb.sb_gquotino != NULLFSINO) {
1539			ASSERT(mp->m_sb.sb_gquotino > 0);
1540			error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1541					     0, 0, &gip);
1542			if (error)
1543				goto error_rele;
1544		}
1545		if (XFS_IS_PQUOTA_ON(mp) &&
1546		    mp->m_sb.sb_pquotino != NULLFSINO) {
1547			ASSERT(mp->m_sb.sb_pquotino > 0);
1548			error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1549					     0, 0, &pip);
1550			if (error)
1551				goto error_rele;
1552		}
1553	} else {
1554		flags |= XFS_QMOPT_SBVERSION;
1555	}
1556
1557	/*
1558	 * Create the three inodes, if they don't exist already. The changes
1559	 * made above will get added to a transaction and logged in one of
1560	 * the qino_alloc calls below.  If the device is readonly,
1561	 * temporarily switch to read-write to do this.
1562	 */
1563	if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1564		error = xfs_qm_qino_alloc(mp, &uip,
1565					      flags | XFS_QMOPT_UQUOTA);
1566		if (error)
1567			goto error_rele;
1568
1569		flags &= ~XFS_QMOPT_SBVERSION;
1570	}
1571	if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1572		error = xfs_qm_qino_alloc(mp, &gip,
1573					  flags | XFS_QMOPT_GQUOTA);
1574		if (error)
1575			goto error_rele;
1576
1577		flags &= ~XFS_QMOPT_SBVERSION;
1578	}
1579	if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1580		error = xfs_qm_qino_alloc(mp, &pip,
1581					  flags | XFS_QMOPT_PQUOTA);
1582		if (error)
1583			goto error_rele;
1584	}
1585
1586	mp->m_quotainfo->qi_uquotaip = uip;
1587	mp->m_quotainfo->qi_gquotaip = gip;
1588	mp->m_quotainfo->qi_pquotaip = pip;
1589
1590	return 0;
1591
1592error_rele:
1593	if (uip)
1594		IRELE(uip);
1595	if (gip)
1596		IRELE(gip);
1597	if (pip)
1598		IRELE(pip);
1599	return error;
1600}
1601
1602STATIC void
1603xfs_qm_dqfree_one(
1604	struct xfs_dquot	*dqp)
1605{
1606	struct xfs_mount	*mp = dqp->q_mount;
1607	struct xfs_quotainfo	*qi = mp->m_quotainfo;
1608
1609	mutex_lock(&qi->qi_tree_lock);
1610	radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1611			  be32_to_cpu(dqp->q_core.d_id));
1612
1613	qi->qi_dquots--;
1614	mutex_unlock(&qi->qi_tree_lock);
1615
1616	xfs_qm_dqdestroy(dqp);
1617}
1618
1619/* --------------- utility functions for vnodeops ---------------- */
1620
1621
1622/*
1623 * Given an inode, a uid, gid and prid make sure that we have
1624 * allocated relevant dquot(s) on disk, and that we won't exceed inode
1625 * quotas by creating this file.
1626 * This also attaches dquot(s) to the given inode after locking it,
1627 * and returns the dquots corresponding to the uid and/or gid.
1628 *
1629 * in	: inode (unlocked)
1630 * out	: udquot, gdquot with references taken and unlocked
1631 */
1632int
1633xfs_qm_vop_dqalloc(
1634	struct xfs_inode	*ip,
1635	xfs_dqid_t		uid,
1636	xfs_dqid_t		gid,
1637	prid_t			prid,
1638	uint			flags,
1639	struct xfs_dquot	**O_udqpp,
1640	struct xfs_dquot	**O_gdqpp,
1641	struct xfs_dquot	**O_pdqpp)
1642{
1643	struct xfs_mount	*mp = ip->i_mount;
1644	struct xfs_dquot	*uq = NULL;
1645	struct xfs_dquot	*gq = NULL;
1646	struct xfs_dquot	*pq = NULL;
1647	int			error;
1648	uint			lockflags;
1649
1650	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1651		return 0;
1652
1653	lockflags = XFS_ILOCK_EXCL;
1654	xfs_ilock(ip, lockflags);
1655
1656	if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1657		gid = ip->i_d.di_gid;
1658
1659	/*
1660	 * Attach the dquot(s) to this inode, doing a dquot allocation
1661	 * if necessary. The dquot(s) will not be locked.
1662	 */
1663	if (XFS_NOT_DQATTACHED(mp, ip)) {
1664		error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1665		if (error) {
1666			xfs_iunlock(ip, lockflags);
1667			return error;
1668		}
1669	}
1670
1671	if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1672		if (ip->i_d.di_uid != uid) {
1673			/*
1674			 * What we need is the dquot that has this uid, and
1675			 * if we send the inode to dqget, the uid of the inode
1676			 * takes priority over what's sent in the uid argument.
1677			 * We must unlock inode here before calling dqget if
1678			 * we're not sending the inode, because otherwise
1679			 * we'll deadlock by doing trans_reserve while
1680			 * holding ilock.
1681			 */
1682			xfs_iunlock(ip, lockflags);
1683			error = xfs_qm_dqget(mp, NULL, uid,
1684						 XFS_DQ_USER,
1685						 XFS_QMOPT_DQALLOC |
1686						 XFS_QMOPT_DOWARN,
1687						 &uq);
1688			if (error) {
1689				ASSERT(error != -ENOENT);
1690				return error;
1691			}
1692			/*
1693			 * Get the ilock in the right order.
1694			 */
1695			xfs_dqunlock(uq);
1696			lockflags = XFS_ILOCK_SHARED;
1697			xfs_ilock(ip, lockflags);
1698		} else {
1699			/*
1700			 * Take an extra reference, because we'll return
1701			 * this to caller
1702			 */
1703			ASSERT(ip->i_udquot);
1704			uq = xfs_qm_dqhold(ip->i_udquot);
1705		}
1706	}
1707	if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1708		if (ip->i_d.di_gid != gid) {
1709			xfs_iunlock(ip, lockflags);
1710			error = xfs_qm_dqget(mp, NULL, gid,
1711						 XFS_DQ_GROUP,
1712						 XFS_QMOPT_DQALLOC |
1713						 XFS_QMOPT_DOWARN,
1714						 &gq);
1715			if (error) {
1716				ASSERT(error != -ENOENT);
1717				goto error_rele;
1718			}
1719			xfs_dqunlock(gq);
1720			lockflags = XFS_ILOCK_SHARED;
1721			xfs_ilock(ip, lockflags);
1722		} else {
1723			ASSERT(ip->i_gdquot);
1724			gq = xfs_qm_dqhold(ip->i_gdquot);
1725		}
1726	}
1727	if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1728		if (xfs_get_projid(ip) != prid) {
1729			xfs_iunlock(ip, lockflags);
1730			error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1731						 XFS_DQ_PROJ,
1732						 XFS_QMOPT_DQALLOC |
1733						 XFS_QMOPT_DOWARN,
1734						 &pq);
1735			if (error) {
1736				ASSERT(error != -ENOENT);
1737				goto error_rele;
1738			}
1739			xfs_dqunlock(pq);
1740			lockflags = XFS_ILOCK_SHARED;
1741			xfs_ilock(ip, lockflags);
1742		} else {
1743			ASSERT(ip->i_pdquot);
1744			pq = xfs_qm_dqhold(ip->i_pdquot);
1745		}
1746	}
1747	if (uq)
1748		trace_xfs_dquot_dqalloc(ip);
1749
1750	xfs_iunlock(ip, lockflags);
1751	if (O_udqpp)
1752		*O_udqpp = uq;
1753	else
1754		xfs_qm_dqrele(uq);
1755	if (O_gdqpp)
1756		*O_gdqpp = gq;
1757	else
1758		xfs_qm_dqrele(gq);
1759	if (O_pdqpp)
1760		*O_pdqpp = pq;
1761	else
1762		xfs_qm_dqrele(pq);
1763	return 0;
1764
1765error_rele:
1766	xfs_qm_dqrele(gq);
1767	xfs_qm_dqrele(uq);
1768	return error;
1769}
1770
1771/*
1772 * Actually transfer ownership, and do dquot modifications.
1773 * These were already reserved.
1774 */
1775xfs_dquot_t *
1776xfs_qm_vop_chown(
1777	xfs_trans_t	*tp,
1778	xfs_inode_t	*ip,
1779	xfs_dquot_t	**IO_olddq,
1780	xfs_dquot_t	*newdq)
1781{
1782	xfs_dquot_t	*prevdq;
1783	uint		bfield = XFS_IS_REALTIME_INODE(ip) ?
1784				 XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1785
1786
1787	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1788	ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1789
1790	/* old dquot */
1791	prevdq = *IO_olddq;
1792	ASSERT(prevdq);
1793	ASSERT(prevdq != newdq);
1794
1795	xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1796	xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1797
1798	/* the sparkling new dquot */
1799	xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1800	xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1801
1802	/*
1803	 * Take an extra reference, because the inode is going to keep
1804	 * this dquot pointer even after the trans_commit.
1805	 */
1806	*IO_olddq = xfs_qm_dqhold(newdq);
1807
1808	return prevdq;
1809}
1810
1811/*
1812 * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1813 */
1814int
1815xfs_qm_vop_chown_reserve(
1816	struct xfs_trans	*tp,
1817	struct xfs_inode	*ip,
1818	struct xfs_dquot	*udqp,
1819	struct xfs_dquot	*gdqp,
1820	struct xfs_dquot	*pdqp,
1821	uint			flags)
1822{
1823	struct xfs_mount	*mp = ip->i_mount;
1824	uint			delblks, blkflags, prjflags = 0;
1825	struct xfs_dquot	*udq_unres = NULL;
1826	struct xfs_dquot	*gdq_unres = NULL;
1827	struct xfs_dquot	*pdq_unres = NULL;
1828	struct xfs_dquot	*udq_delblks = NULL;
1829	struct xfs_dquot	*gdq_delblks = NULL;
1830	struct xfs_dquot	*pdq_delblks = NULL;
1831	int			error;
1832
1833
1834	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1835	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1836
1837	delblks = ip->i_delayed_blks;
1838	blkflags = XFS_IS_REALTIME_INODE(ip) ?
1839			XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1840
1841	if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1842	    ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1843		udq_delblks = udqp;
1844		/*
1845		 * If there are delayed allocation blocks, then we have to
1846		 * unreserve those from the old dquot, and add them to the
1847		 * new dquot.
1848		 */
1849		if (delblks) {
1850			ASSERT(ip->i_udquot);
1851			udq_unres = ip->i_udquot;
1852		}
1853	}
1854	if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1855	    ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1856		gdq_delblks = gdqp;
1857		if (delblks) {
1858			ASSERT(ip->i_gdquot);
1859			gdq_unres = ip->i_gdquot;
1860		}
1861	}
1862
1863	if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1864	    xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1865		prjflags = XFS_QMOPT_ENOSPC;
1866		pdq_delblks = pdqp;
1867		if (delblks) {
1868			ASSERT(ip->i_pdquot);
1869			pdq_unres = ip->i_pdquot;
1870		}
1871	}
1872
1873	error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1874				udq_delblks, gdq_delblks, pdq_delblks,
1875				ip->i_d.di_nblocks, 1,
1876				flags | blkflags | prjflags);
1877	if (error)
1878		return error;
1879
1880	/*
1881	 * Do the delayed blks reservations/unreservations now. Since, these
1882	 * are done without the help of a transaction, if a reservation fails
1883	 * its previous reservations won't be automatically undone by trans
1884	 * code. So, we have to do it manually here.
1885	 */
1886	if (delblks) {
1887		/*
1888		 * Do the reservations first. Unreservation can't fail.
1889		 */
1890		ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1891		ASSERT(udq_unres || gdq_unres || pdq_unres);
1892		error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1893			    udq_delblks, gdq_delblks, pdq_delblks,
1894			    (xfs_qcnt_t)delblks, 0,
1895			    flags | blkflags | prjflags);
1896		if (error)
1897			return error;
1898		xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1899				udq_unres, gdq_unres, pdq_unres,
1900				-((xfs_qcnt_t)delblks), 0, blkflags);
1901	}
1902
1903	return 0;
1904}
1905
1906int
1907xfs_qm_vop_rename_dqattach(
1908	struct xfs_inode	**i_tab)
1909{
1910	struct xfs_mount	*mp = i_tab[0]->i_mount;
1911	int			i;
1912
1913	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1914		return 0;
1915
1916	for (i = 0; (i < 4 && i_tab[i]); i++) {
1917		struct xfs_inode	*ip = i_tab[i];
1918		int			error;
1919
1920		/*
1921		 * Watch out for duplicate entries in the table.
1922		 */
1923		if (i == 0 || ip != i_tab[i-1]) {
1924			if (XFS_NOT_DQATTACHED(mp, ip)) {
1925				error = xfs_qm_dqattach(ip, 0);
1926				if (error)
1927					return error;
1928			}
1929		}
1930	}
1931	return 0;
1932}
1933
1934void
1935xfs_qm_vop_create_dqattach(
1936	struct xfs_trans	*tp,
1937	struct xfs_inode	*ip,
1938	struct xfs_dquot	*udqp,
1939	struct xfs_dquot	*gdqp,
1940	struct xfs_dquot	*pdqp)
1941{
1942	struct xfs_mount	*mp = tp->t_mountp;
1943
1944	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1945		return;
1946
1947	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1948	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1949
1950	if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1951		ASSERT(ip->i_udquot == NULL);
1952		ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1953
1954		ip->i_udquot = xfs_qm_dqhold(udqp);
1955		xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1956	}
1957	if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1958		ASSERT(ip->i_gdquot == NULL);
1959		ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1960		ip->i_gdquot = xfs_qm_dqhold(gdqp);
1961		xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1962	}
1963	if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1964		ASSERT(ip->i_pdquot == NULL);
1965		ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1966
1967		ip->i_pdquot = xfs_qm_dqhold(pdqp);
1968		xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1969	}
1970}
1971