1/*
   2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3 * All Rights Reserved.
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it would be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write the Free Software Foundation,
  16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18#include "xfs.h"
  19#include "xfs_fs.h"
  20#include "xfs_shared.h"
  21#include "xfs_format.h"
  22#include "xfs_log_format.h"
  23#include "xfs_trans_resv.h"
  24#include "xfs_bit.h"
  25#include "xfs_sb.h"
  26#include "xfs_mount.h"
  27#include "xfs_inode.h"
  28#include "xfs_ialloc.h"
  29#include "xfs_itable.h"
  30#include "xfs_quota.h"
  31#include "xfs_error.h"
  32#include "xfs_bmap.h"
  33#include "xfs_bmap_btree.h"
  34#include "xfs_trans.h"
  35#include "xfs_trans_space.h"
  36#include "xfs_qm.h"
  37#include "xfs_trace.h"
  38#include "xfs_icache.h"
  39#include "xfs_cksum.h"
  40
  41/*
  42 * The global quota manager. There is only one of these for the entire
  43 * system, _not_ one per file system. XQM keeps track of the overall
  44 * quota functionality, including maintaining the freelist and hash
  45 * tables of dquots.
  46 */
  47STATIC int	xfs_qm_init_quotainos(xfs_mount_t *);
  48STATIC int	xfs_qm_init_quotainfo(xfs_mount_t *);
  49
  50
  51STATIC void	xfs_qm_dqfree_one(struct xfs_dquot *dqp);
  52/*
  53 * We use the batch lookup interface to iterate over the dquots as it
  54 * currently is the only interface into the radix tree code that allows
  55 * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  56 * operations is fine as all callers are used either during mount/umount
  57 * or quotaoff.
  58 */
  59#define XFS_DQ_LOOKUP_BATCH	32
  60
  61STATIC int
  62xfs_qm_dquot_walk(
  63	struct xfs_mount	*mp,
  64	int			type,
  65	int			(*execute)(struct xfs_dquot *dqp, void *data),
  66	void			*data)
  67{
  68	struct xfs_quotainfo	*qi = mp->m_quotainfo;
  69	struct radix_tree_root	*tree = xfs_dquot_tree(qi, type);
  70	uint32_t		next_index;
  71	int			last_error = 0;
  72	int			skipped;
  73	int			nr_found;
  74
  75restart:
  76	skipped = 0;
  77	next_index = 0;
  78	nr_found = 0;
  79
  80	while (1) {
  81		struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  82		int		error = 0;
  83		int		i;
  84
  85		mutex_lock(&qi->qi_tree_lock);
  86		nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  87					next_index, XFS_DQ_LOOKUP_BATCH);
  88		if (!nr_found) {
  89			mutex_unlock(&qi->qi_tree_lock);
  90			break;
  91		}
  92
  93		for (i = 0; i < nr_found; i++) {
  94			struct xfs_dquot *dqp = batch[i];
  95
  96			next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
  97
  98			error = execute(batch[i], data);
  99			if (error == -EAGAIN) {
 100				skipped++;
 101				continue;
 102			}
 103			if (error && last_error != -EFSCORRUPTED)
 104				last_error = error;
 105		}
 106
 107		mutex_unlock(&qi->qi_tree_lock);
 108
 109		/* bail out if the filesystem is corrupted.  */
 110		if (last_error == -EFSCORRUPTED) {
 111			skipped = 0;
 112			break;
 113		}
 114	}
 115
 116	if (skipped) {
 117		delay(1);
 118		goto restart;
 119	}
 120
 121	return last_error;
 122}
 123
 124
 125/*
 126 * Purge a dquot from all tracking data structures and free it.
 127 */
 128STATIC int
 129xfs_qm_dqpurge(
 130	struct xfs_dquot	*dqp,
 131	void			*data)
 132{
 133	struct xfs_mount	*mp = dqp->q_mount;
 134	struct xfs_quotainfo	*qi = mp->m_quotainfo;
 135
 136	xfs_dqlock(dqp);
 137	if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 138		xfs_dqunlock(dqp);
 139		return -EAGAIN;
 140	}
 141
 142	dqp->dq_flags |= XFS_DQ_FREEING;
 143
 144	xfs_dqflock(dqp);
 145
 146	/*
 147	 * If we are turning this type of quotas off, we don't care
 148	 * about the dirty metadata sitting in this dquot. OTOH, if
 149	 * we're unmounting, we do care, so we flush it and wait.
 150	 */
 151	if (XFS_DQ_IS_DIRTY(dqp)) {
 152		struct xfs_buf	*bp = NULL;
 153		int		error;
 154
 155		/*
 156		 * We don't care about getting disk errors here. We need
 157		 * to purge this dquot anyway, so we go ahead regardless.
 158		 */
 159		error = xfs_qm_dqflush(dqp, &bp);
 160		if (error) {
 161			xfs_warn(mp, "%s: dquot %p flush failed",
 162				__func__, dqp);
 163		} else {
 164			error = xfs_bwrite(bp);
 165			xfs_buf_relse(bp);
 166		}
 167		xfs_dqflock(dqp);
 168	}
 169
 170	ASSERT(atomic_read(&dqp->q_pincount) == 0);
 171	ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 172	       !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 173
 174	xfs_dqfunlock(dqp);
 175	xfs_dqunlock(dqp);
 176
 177	radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 178			  be32_to_cpu(dqp->q_core.d_id));
 179	qi->qi_dquots--;
 180
 181	/*
 182	 * We move dquots to the freelist as soon as their reference count
 183	 * hits zero, so it really should be on the freelist here.
 184	 */
 185	ASSERT(!list_empty(&dqp->q_lru));
 186	list_lru_del(&qi->qi_lru, &dqp->q_lru);
 187	XFS_STATS_DEC(mp, xs_qm_dquot_unused);
 188
 189	xfs_qm_dqdestroy(dqp);
 190	return 0;
 191}
 192
 193/*
 194 * Purge the dquot cache.
 195 */
 196void
 197xfs_qm_dqpurge_all(
 198	struct xfs_mount	*mp,
 199	uint			flags)
 200{
 201	if (flags & XFS_QMOPT_UQUOTA)
 202		xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 203	if (flags & XFS_QMOPT_GQUOTA)
 204		xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 205	if (flags & XFS_QMOPT_PQUOTA)
 206		xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 207}
 208
 209/*
 210 * Just destroy the quotainfo structure.
 211 */
 212void
 213xfs_qm_unmount(
 214	struct xfs_mount	*mp)
 215{
 216	if (mp->m_quotainfo) {
 217		xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 218		xfs_qm_destroy_quotainfo(mp);
 219	}
 220}
 221
 222/*
 223 * Called from the vfsops layer.
 224 */
 225void
 226xfs_qm_unmount_quotas(
 227	xfs_mount_t	*mp)
 228{
 229	/*
 230	 * Release the dquots that root inode, et al might be holding,
 231	 * before we flush quotas and blow away the quotainfo structure.
 232	 */
 233	ASSERT(mp->m_rootip);
 234	xfs_qm_dqdetach(mp->m_rootip);
 235	if (mp->m_rbmip)
 236		xfs_qm_dqdetach(mp->m_rbmip);
 237	if (mp->m_rsumip)
 238		xfs_qm_dqdetach(mp->m_rsumip);
 239
 240	/*
 241	 * Release the quota inodes.
 242	 */
 243	if (mp->m_quotainfo) {
 244		if (mp->m_quotainfo->qi_uquotaip) {
 245			IRELE(mp->m_quotainfo->qi_uquotaip);
 246			mp->m_quotainfo->qi_uquotaip = NULL;
 247		}
 248		if (mp->m_quotainfo->qi_gquotaip) {
 249			IRELE(mp->m_quotainfo->qi_gquotaip);
 250			mp->m_quotainfo->qi_gquotaip = NULL;
 251		}
 252		if (mp->m_quotainfo->qi_pquotaip) {
 253			IRELE(mp->m_quotainfo->qi_pquotaip);
 254			mp->m_quotainfo->qi_pquotaip = NULL;
 255		}
 256	}
 257}
 258
 259STATIC int
 260xfs_qm_dqattach_one(
 261	xfs_inode_t	*ip,
 262	xfs_dqid_t	id,
 263	uint		type,
 264	uint		doalloc,
 265	xfs_dquot_t	**IO_idqpp)
 266{
 267	xfs_dquot_t	*dqp;
 268	int		error;
 269
 270	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 271	error = 0;
 272
 273	/*
 274	 * See if we already have it in the inode itself. IO_idqpp is &i_udquot
 275	 * or &i_gdquot. This made the code look weird, but made the logic a lot
 276	 * simpler.
 277	 */
 278	dqp = *IO_idqpp;
 279	if (dqp) {
 280		trace_xfs_dqattach_found(dqp);
 281		return 0;
 282	}
 283
 284	/*
 285	 * Find the dquot from somewhere. This bumps the reference count of
 286	 * dquot and returns it locked.  This can return ENOENT if dquot didn't
 287	 * exist on disk and we didn't ask it to allocate; ESRCH if quotas got
 288	 * turned off suddenly.
 289	 */
 290	error = xfs_qm_dqget(ip->i_mount, ip, id, type,
 291			     doalloc | XFS_QMOPT_DOWARN, &dqp);
 292	if (error)
 293		return error;
 294
 295	trace_xfs_dqattach_get(dqp);
 296
 297	/*
 298	 * dqget may have dropped and re-acquired the ilock, but it guarantees
 299	 * that the dquot returned is the one that should go in the inode.
 300	 */
 301	*IO_idqpp = dqp;
 302	xfs_dqunlock(dqp);
 303	return 0;
 304}
 305
 306static bool
 307xfs_qm_need_dqattach(
 308	struct xfs_inode	*ip)
 309{
 310	struct xfs_mount	*mp = ip->i_mount;
 311
 312	if (!XFS_IS_QUOTA_RUNNING(mp))
 313		return false;
 314	if (!XFS_IS_QUOTA_ON(mp))
 315		return false;
 316	if (!XFS_NOT_DQATTACHED(mp, ip))
 317		return false;
 318	if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 319		return false;
 320	return true;
 321}
 322
 323/*
 324 * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 325 * into account.
 326 * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 327 * Inode may get unlocked and relocked in here, and the caller must deal with
 328 * the consequences.
 329 */
 330int
 331xfs_qm_dqattach_locked(
 332	xfs_inode_t	*ip,
 333	uint		flags)
 334{
 335	xfs_mount_t	*mp = ip->i_mount;
 336	int		error = 0;
 337
 338	if (!xfs_qm_need_dqattach(ip))
 339		return 0;
 340
 341	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 342
 343	if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
 344		error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 345						flags & XFS_QMOPT_DQALLOC,
 346						&ip->i_udquot);
 347		if (error)
 348			goto done;
 349		ASSERT(ip->i_udquot);
 350	}
 351
 352	if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
 353		error = xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 354						flags & XFS_QMOPT_DQALLOC,
 355						&ip->i_gdquot);
 356		if (error)
 357			goto done;
 358		ASSERT(ip->i_gdquot);
 359	}
 360
 361	if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
 362		error = xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 363						flags & XFS_QMOPT_DQALLOC,
 364						&ip->i_pdquot);
 365		if (error)
 366			goto done;
 367		ASSERT(ip->i_pdquot);
 368	}
 369
 370done:
 371	/*
 372	 * Don't worry about the dquots that we may have attached before any
 373	 * error - they'll get detached later if it has not already been done.
 374	 */
 375	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 376	return error;
 377}
 378
 379int
 380xfs_qm_dqattach(
 381	struct xfs_inode	*ip,
 382	uint			flags)
 383{
 384	int			error;
 385
 386	if (!xfs_qm_need_dqattach(ip))
 387		return 0;
 388
 389	xfs_ilock(ip, XFS_ILOCK_EXCL);
 390	error = xfs_qm_dqattach_locked(ip, flags);
 391	xfs_iunlock(ip, XFS_ILOCK_EXCL);
 392
 393	return error;
 394}
 395
 396/*
 397 * Release dquots (and their references) if any.
 398 * The inode should be locked EXCL except when this's called by
 399 * xfs_ireclaim.
 400 */
 401void
 402xfs_qm_dqdetach(
 403	xfs_inode_t	*ip)
 404{
 405	if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 406		return;
 407
 408	trace_xfs_dquot_dqdetach(ip);
 409
 410	ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 411	if (ip->i_udquot) {
 412		xfs_qm_dqrele(ip->i_udquot);
 413		ip->i_udquot = NULL;
 414	}
 415	if (ip->i_gdquot) {
 416		xfs_qm_dqrele(ip->i_gdquot);
 417		ip->i_gdquot = NULL;
 418	}
 419	if (ip->i_pdquot) {
 420		xfs_qm_dqrele(ip->i_pdquot);
 421		ip->i_pdquot = NULL;
 422	}
 423}
 424
 425struct xfs_qm_isolate {
 426	struct list_head	buffers;
 427	struct list_head	dispose;
 428};
 429
 430static enum lru_status
 431xfs_qm_dquot_isolate(
 432	struct list_head	*item,
 433	struct list_lru_one	*lru,
 434	spinlock_t		*lru_lock,
 435	void			*arg)
 436		__releases(lru_lock) __acquires(lru_lock)
 437{
 438	struct xfs_dquot	*dqp = container_of(item,
 439						struct xfs_dquot, q_lru);
 440	struct xfs_qm_isolate	*isol = arg;
 441
 442	if (!xfs_dqlock_nowait(dqp))
 443		goto out_miss_busy;
 444
 445	/*
 446	 * This dquot has acquired a reference in the meantime remove it from
 447	 * the freelist and try again.
 448	 */
 449	if (dqp->q_nrefs) {
 450		xfs_dqunlock(dqp);
 451		XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
 452
 453		trace_xfs_dqreclaim_want(dqp);
 454		list_lru_isolate(lru, &dqp->q_lru);
 455		XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 456		return LRU_REMOVED;
 457	}
 458
 459	/*
 460	 * If the dquot is dirty, flush it. If it's already being flushed, just
 461	 * skip it so there is time for the IO to complete before we try to
 462	 * reclaim it again on the next LRU pass.
 463	 */
 464	if (!xfs_dqflock_nowait(dqp)) {
 465		xfs_dqunlock(dqp);
 466		goto out_miss_busy;
 467	}
 468
 469	if (XFS_DQ_IS_DIRTY(dqp)) {
 470		struct xfs_buf	*bp = NULL;
 471		int		error;
 472
 473		trace_xfs_dqreclaim_dirty(dqp);
 474
 475		/* we have to drop the LRU lock to flush the dquot */
 476		spin_unlock(lru_lock);
 477
 478		error = xfs_qm_dqflush(dqp, &bp);
 479		if (error) {
 480			xfs_warn(dqp->q_mount, "%s: dquot %p flush failed",
 481				 __func__, dqp);
 482			goto out_unlock_dirty;
 483		}
 484
 485		xfs_buf_delwri_queue(bp, &isol->buffers);
 486		xfs_buf_relse(bp);
 487		goto out_unlock_dirty;
 488	}
 489	xfs_dqfunlock(dqp);
 490
 491	/*
 492	 * Prevent lookups now that we are past the point of no return.
 493	 */
 494	dqp->dq_flags |= XFS_DQ_FREEING;
 495	xfs_dqunlock(dqp);
 496
 497	ASSERT(dqp->q_nrefs == 0);
 498	list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
 499	XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
 500	trace_xfs_dqreclaim_done(dqp);
 501	XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
 502	return LRU_REMOVED;
 503
 504out_miss_busy:
 505	trace_xfs_dqreclaim_busy(dqp);
 506	XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 507	return LRU_SKIP;
 508
 509out_unlock_dirty:
 510	trace_xfs_dqreclaim_busy(dqp);
 511	XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
 512	xfs_dqunlock(dqp);
 513	spin_lock(lru_lock);
 514	return LRU_RETRY;
 515}
 516
 517static unsigned long
 518xfs_qm_shrink_scan(
 519	struct shrinker		*shrink,
 520	struct shrink_control	*sc)
 521{
 522	struct xfs_quotainfo	*qi = container_of(shrink,
 523					struct xfs_quotainfo, qi_shrinker);
 524	struct xfs_qm_isolate	isol;
 525	unsigned long		freed;
 526	int			error;
 527
 528	if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
 529		return 0;
 530
 531	INIT_LIST_HEAD(&isol.buffers);
 532	INIT_LIST_HEAD(&isol.dispose);
 533
 534	freed = list_lru_shrink_walk(&qi->qi_lru, sc,
 535				     xfs_qm_dquot_isolate, &isol);
 536
 537	error = xfs_buf_delwri_submit(&isol.buffers);
 538	if (error)
 539		xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
 540
 541	while (!list_empty(&isol.dispose)) {
 542		struct xfs_dquot	*dqp;
 543
 544		dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
 545		list_del_init(&dqp->q_lru);
 546		xfs_qm_dqfree_one(dqp);
 547	}
 548
 549	return freed;
 550}
 551
 552static unsigned long
 553xfs_qm_shrink_count(
 554	struct shrinker		*shrink,
 555	struct shrink_control	*sc)
 556{
 557	struct xfs_quotainfo	*qi = container_of(shrink,
 558					struct xfs_quotainfo, qi_shrinker);
 559
 560	return list_lru_shrink_count(&qi->qi_lru, sc);
 561}
 562
 563STATIC void
 564xfs_qm_set_defquota(
 565	xfs_mount_t	*mp,
 566	uint		type,
 567	xfs_quotainfo_t	*qinf)
 568{
 569	xfs_dquot_t		*dqp;
 570	struct xfs_def_quota    *defq;
 571	int			error;
 572
 573	error = xfs_qm_dqread(mp, 0, type, XFS_QMOPT_DOWARN, &dqp);
 574
 575	if (!error) {
 576		xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 577
 578		defq = xfs_get_defquota(dqp, qinf);
 579
 580		/*
 581		 * Timers and warnings have been already set, let's just set the
 582		 * default limits for this quota type
 583		 */
 584		defq->bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 585		defq->bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 586		defq->ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 587		defq->isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 588		defq->rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 589		defq->rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 590		xfs_qm_dqdestroy(dqp);
 591	}
 592}
 593
 594/*
 595 * This initializes all the quota information that's kept in the
 596 * mount structure
 597 */
 598STATIC int
 599xfs_qm_init_quotainfo(
 600	xfs_mount_t	*mp)
 601{
 602	xfs_quotainfo_t *qinf;
 603	int		error;
 604	xfs_dquot_t	*dqp;
 605
 606	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 607
 608	qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 609
 610	error = list_lru_init(&qinf->qi_lru);
 611	if (error)
 612		goto out_free_qinf;
 613
 614	/*
 615	 * See if quotainodes are setup, and if not, allocate them,
 616	 * and change the superblock accordingly.
 617	 */
 618	error = xfs_qm_init_quotainos(mp);
 619	if (error)
 620		goto out_free_lru;
 621
 622	INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 623	INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 624	INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 625	mutex_init(&qinf->qi_tree_lock);
 626
 627	/* mutex used to serialize quotaoffs */
 628	mutex_init(&qinf->qi_quotaofflock);
 629
 630	/* Precalc some constants */
 631	qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 632	qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
 633
 634	mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 635
 636	/*
 637	 * We try to get the limits from the superuser's limits fields.
 638	 * This is quite hacky, but it is standard quota practice.
 639	 *
 640	 * Since we may not have done a quotacheck by this point, just read
 641	 * the dquot without attaching it to any hashtables or lists.
 642	 *
 643	 * Timers and warnings are globally set by the first timer found in
 644	 * user/group/proj quota types, otherwise a default value is used.
 645	 * This should be split into different fields per quota type.
 646	 */
 647	error = xfs_qm_dqread(mp, 0,
 648			XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 649			 (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 650			  XFS_DQ_PROJ),
 651			XFS_QMOPT_DOWARN, &dqp);
 652
 653	if (!error) {
 654		xfs_disk_dquot_t	*ddqp = &dqp->q_core;
 655
 656		/*
 657		 * The warnings and timers set the grace period given to
 658		 * a user or group before he or she can not perform any
 659		 * more writing. If it is zero, a default is used.
 660		 */
 661		qinf->qi_btimelimit = ddqp->d_btimer ?
 662			be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 663		qinf->qi_itimelimit = ddqp->d_itimer ?
 664			be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 665		qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 666			be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 667		qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 668			be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 669		qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 670			be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 671		qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 672			be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 673		xfs_qm_dqdestroy(dqp);
 674	} else {
 675		qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 676		qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 677		qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 678		qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 679		qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 680		qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 681	}
 682
 683	if (XFS_IS_UQUOTA_RUNNING(mp))
 684		xfs_qm_set_defquota(mp, XFS_DQ_USER, qinf);
 685	if (XFS_IS_GQUOTA_RUNNING(mp))
 686		xfs_qm_set_defquota(mp, XFS_DQ_GROUP, qinf);
 687	if (XFS_IS_PQUOTA_RUNNING(mp))
 688		xfs_qm_set_defquota(mp, XFS_DQ_PROJ, qinf);
 689
 690	qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
 691	qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
 692	qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 693	qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 694	register_shrinker(&qinf->qi_shrinker);
 695	return 0;
 696
 697out_free_lru:
 698	list_lru_destroy(&qinf->qi_lru);
 699out_free_qinf:
 700	kmem_free(qinf);
 701	mp->m_quotainfo = NULL;
 702	return error;
 703}
 704
 705
 706/*
 707 * Gets called when unmounting a filesystem or when all quotas get
 708 * turned off.
 709 * This purges the quota inodes, destroys locks and frees itself.
 710 */
 711void
 712xfs_qm_destroy_quotainfo(
 713	xfs_mount_t	*mp)
 714{
 715	xfs_quotainfo_t *qi;
 716
 717	qi = mp->m_quotainfo;
 718	ASSERT(qi != NULL);
 719
 720	unregister_shrinker(&qi->qi_shrinker);
 721	list_lru_destroy(&qi->qi_lru);
 722
 723	if (qi->qi_uquotaip) {
 724		IRELE(qi->qi_uquotaip);
 725		qi->qi_uquotaip = NULL; /* paranoia */
 726	}
 727	if (qi->qi_gquotaip) {
 728		IRELE(qi->qi_gquotaip);
 729		qi->qi_gquotaip = NULL;
 730	}
 731	if (qi->qi_pquotaip) {
 732		IRELE(qi->qi_pquotaip);
 733		qi->qi_pquotaip = NULL;
 734	}
 735	mutex_destroy(&qi->qi_quotaofflock);
 736	kmem_free(qi);
 737	mp->m_quotainfo = NULL;
 738}
 739
 740/*
 741 * Create an inode and return with a reference already taken, but unlocked
 742 * This is how we create quota inodes
 743 */
 744STATIC int
 745xfs_qm_qino_alloc(
 746	xfs_mount_t	*mp,
 747	xfs_inode_t	**ip,
 748	uint		flags)
 749{
 750	xfs_trans_t	*tp;
 751	int		error;
 752	int		committed;
 753	bool		need_alloc = true;
 754
 755	*ip = NULL;
 756	/*
 757	 * With superblock that doesn't have separate pquotino, we
 758	 * share an inode between gquota and pquota. If the on-disk
 759	 * superblock has GQUOTA and the filesystem is now mounted
 760	 * with PQUOTA, just use sb_gquotino for sb_pquotino and
 761	 * vice-versa.
 762	 */
 763	if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
 764			(flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
 765		xfs_ino_t ino = NULLFSINO;
 766
 767		if ((flags & XFS_QMOPT_PQUOTA) &&
 768			     (mp->m_sb.sb_gquotino != NULLFSINO)) {
 769			ino = mp->m_sb.sb_gquotino;
 770			ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
 771		} else if ((flags & XFS_QMOPT_GQUOTA) &&
 772			     (mp->m_sb.sb_pquotino != NULLFSINO)) {
 773			ino = mp->m_sb.sb_pquotino;
 774			ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
 775		}
 776		if (ino != NULLFSINO) {
 777			error = xfs_iget(mp, NULL, ino, 0, 0, ip);
 778			if (error)
 779				return error;
 780			mp->m_sb.sb_gquotino = NULLFSINO;
 781			mp->m_sb.sb_pquotino = NULLFSINO;
 782			need_alloc = false;
 783		}
 784	}
 785
 786	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
 787			XFS_QM_QINOCREATE_SPACE_RES(mp), 0, 0, &tp);
 788	if (error)
 
 
 789		return error;
 
 790
 791	if (need_alloc) {
 792		error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
 793								&committed);
 794		if (error) {
 795			xfs_trans_cancel(tp);
 796			return error;
 797		}
 798	}
 799
 800	/*
 801	 * Make the changes in the superblock, and log those too.
 802	 * sbfields arg may contain fields other than *QUOTINO;
 803	 * VERSIONNUM for example.
 804	 */
 805	spin_lock(&mp->m_sb_lock);
 806	if (flags & XFS_QMOPT_SBVERSION) {
 807		ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 808
 809		xfs_sb_version_addquota(&mp->m_sb);
 810		mp->m_sb.sb_uquotino = NULLFSINO;
 811		mp->m_sb.sb_gquotino = NULLFSINO;
 812		mp->m_sb.sb_pquotino = NULLFSINO;
 813
 814		/* qflags will get updated fully _after_ quotacheck */
 815		mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 816	}
 817	if (flags & XFS_QMOPT_UQUOTA)
 818		mp->m_sb.sb_uquotino = (*ip)->i_ino;
 819	else if (flags & XFS_QMOPT_GQUOTA)
 820		mp->m_sb.sb_gquotino = (*ip)->i_ino;
 821	else
 822		mp->m_sb.sb_pquotino = (*ip)->i_ino;
 823	spin_unlock(&mp->m_sb_lock);
 824	xfs_log_sb(tp);
 825
 826	error = xfs_trans_commit(tp);
 827	if (error) {
 828		ASSERT(XFS_FORCED_SHUTDOWN(mp));
 829		xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 830	}
 831	if (need_alloc)
 832		xfs_finish_inode_setup(*ip);
 833	return error;
 834}
 835
 836
 837STATIC void
 838xfs_qm_reset_dqcounts(
 839	xfs_mount_t	*mp,
 840	xfs_buf_t	*bp,
 841	xfs_dqid_t	id,
 842	uint		type)
 843{
 844	struct xfs_dqblk	*dqb;
 845	int			j;
 846
 847	trace_xfs_reset_dqcounts(bp, _RET_IP_);
 848
 849	/*
 850	 * Reset all counters and timers. They'll be
 851	 * started afresh by xfs_qm_quotacheck.
 852	 */
 853#ifdef DEBUG
 854	j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 855	do_div(j, sizeof(xfs_dqblk_t));
 856	ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 857#endif
 858	dqb = bp->b_addr;
 859	for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 860		struct xfs_disk_dquot	*ddq;
 861
 862		ddq = (struct xfs_disk_dquot *)&dqb[j];
 863
 864		/*
 865		 * Do a sanity check, and if needed, repair the dqblk. Don't
 866		 * output any warnings because it's perfectly possible to
 867		 * find uninitialised dquot blks. See comment in xfs_dqcheck.
 868		 */
 869		xfs_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 870			    "xfs_quotacheck");
 871		/*
 872		 * Reset type in case we are reusing group quota file for
 873		 * project quotas or vice versa
 874		 */
 875		ddq->d_flags = type;
 876		ddq->d_bcount = 0;
 877		ddq->d_icount = 0;
 878		ddq->d_rtbcount = 0;
 879		ddq->d_btimer = 0;
 880		ddq->d_itimer = 0;
 881		ddq->d_rtbtimer = 0;
 882		ddq->d_bwarns = 0;
 883		ddq->d_iwarns = 0;
 884		ddq->d_rtbwarns = 0;
 885
 886		if (xfs_sb_version_hascrc(&mp->m_sb)) {
 887			xfs_update_cksum((char *)&dqb[j],
 888					 sizeof(struct xfs_dqblk),
 889					 XFS_DQUOT_CRC_OFF);
 890		}
 891	}
 892}
 893
 894STATIC int
 895xfs_qm_dqiter_bufs(
 896	struct xfs_mount	*mp,
 897	xfs_dqid_t		firstid,
 898	xfs_fsblock_t		bno,
 899	xfs_filblks_t		blkcnt,
 900	uint			flags,
 901	struct list_head	*buffer_list)
 902{
 903	struct xfs_buf		*bp;
 904	int			error;
 905	int			type;
 906
 907	ASSERT(blkcnt > 0);
 908	type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 909		(flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 910	error = 0;
 911
 912	/*
 913	 * Blkcnt arg can be a very big number, and might even be
 914	 * larger than the log itself. So, we have to break it up into
 915	 * manageable-sized transactions.
 916	 * Note that we don't start a permanent transaction here; we might
 917	 * not be able to get a log reservation for the whole thing up front,
 918	 * and we don't really care to either, because we just discard
 919	 * everything if we were to crash in the middle of this loop.
 920	 */
 921	while (blkcnt--) {
 922		error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 923			      XFS_FSB_TO_DADDR(mp, bno),
 924			      mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 925			      &xfs_dquot_buf_ops);
 926
 927		/*
 928		 * CRC and validation errors will return a EFSCORRUPTED here. If
 929		 * this occurs, re-read without CRC validation so that we can
 930		 * repair the damage via xfs_qm_reset_dqcounts(). This process
 931		 * will leave a trace in the log indicating corruption has
 932		 * been detected.
 933		 */
 934		if (error == -EFSCORRUPTED) {
 935			error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 936				      XFS_FSB_TO_DADDR(mp, bno),
 937				      mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 938				      NULL);
 939		}
 940
 941		if (error)
 942			break;
 943
 944		/*
 945		 * A corrupt buffer might not have a verifier attached, so
 946		 * make sure we have the correct one attached before writeback
 947		 * occurs.
 948		 */
 949		bp->b_ops = &xfs_dquot_buf_ops;
 950		xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 951		xfs_buf_delwri_queue(bp, buffer_list);
 952		xfs_buf_relse(bp);
 953
 954		/* goto the next block. */
 955		bno++;
 956		firstid += mp->m_quotainfo->qi_dqperchunk;
 957	}
 958
 959	return error;
 960}
 961
 962/*
 963 * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 964 * caller supplied function for every chunk of dquots that we find.
 965 */
 966STATIC int
 967xfs_qm_dqiterate(
 968	struct xfs_mount	*mp,
 969	struct xfs_inode	*qip,
 970	uint			flags,
 971	struct list_head	*buffer_list)
 972{
 973	struct xfs_bmbt_irec	*map;
 974	int			i, nmaps;	/* number of map entries */
 975	int			error;		/* return value */
 976	xfs_fileoff_t		lblkno;
 977	xfs_filblks_t		maxlblkcnt;
 978	xfs_dqid_t		firstid;
 979	xfs_fsblock_t		rablkno;
 980	xfs_filblks_t		rablkcnt;
 981
 982	error = 0;
 983	/*
 984	 * This looks racy, but we can't keep an inode lock across a
 985	 * trans_reserve. But, this gets called during quotacheck, and that
 986	 * happens only at mount time which is single threaded.
 987	 */
 988	if (qip->i_d.di_nblocks == 0)
 989		return 0;
 990
 991	map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 992
 993	lblkno = 0;
 994	maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 995	do {
 996		uint		lock_mode;
 997
 998		nmaps = XFS_DQITER_MAP_SIZE;
 999		/*
1000		 * We aren't changing the inode itself. Just changing
1001		 * some of its data. No new blocks are added here, and
1002		 * the inode is never added to the transaction.
1003		 */
1004		lock_mode = xfs_ilock_data_map_shared(qip);
1005		error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
1006				       map, &nmaps, 0);
1007		xfs_iunlock(qip, lock_mode);
1008		if (error)
1009			break;
1010
1011		ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1012		for (i = 0; i < nmaps; i++) {
1013			ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1014			ASSERT(map[i].br_blockcount);
1015
1016
1017			lblkno += map[i].br_blockcount;
1018
1019			if (map[i].br_startblock == HOLESTARTBLOCK)
1020				continue;
1021
1022			firstid = (xfs_dqid_t) map[i].br_startoff *
1023				mp->m_quotainfo->qi_dqperchunk;
1024			/*
1025			 * Do a read-ahead on the next extent.
1026			 */
1027			if ((i+1 < nmaps) &&
1028			    (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1029				rablkcnt =  map[i+1].br_blockcount;
1030				rablkno = map[i+1].br_startblock;
1031				while (rablkcnt--) {
1032					xfs_buf_readahead(mp->m_ddev_targp,
1033					       XFS_FSB_TO_DADDR(mp, rablkno),
1034					       mp->m_quotainfo->qi_dqchunklen,
1035					       &xfs_dquot_buf_ops);
1036					rablkno++;
1037				}
1038			}
1039			/*
1040			 * Iterate thru all the blks in the extent and
1041			 * reset the counters of all the dquots inside them.
1042			 */
1043			error = xfs_qm_dqiter_bufs(mp, firstid,
1044						   map[i].br_startblock,
1045						   map[i].br_blockcount,
1046						   flags, buffer_list);
1047			if (error)
1048				goto out;
1049		}
1050	} while (nmaps > 0);
1051
1052out:
1053	kmem_free(map);
1054	return error;
1055}
1056
1057/*
1058 * Called by dqusage_adjust in doing a quotacheck.
1059 *
1060 * Given the inode, and a dquot id this updates both the incore dqout as well
1061 * as the buffer copy. This is so that once the quotacheck is done, we can
1062 * just log all the buffers, as opposed to logging numerous updates to
1063 * individual dquots.
1064 */
1065STATIC int
1066xfs_qm_quotacheck_dqadjust(
1067	struct xfs_inode	*ip,
1068	xfs_dqid_t		id,
1069	uint			type,
1070	xfs_qcnt_t		nblks,
1071	xfs_qcnt_t		rtblks)
1072{
1073	struct xfs_mount	*mp = ip->i_mount;
1074	struct xfs_dquot	*dqp;
1075	int			error;
1076
1077	error = xfs_qm_dqget(mp, ip, id, type,
1078			     XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1079	if (error) {
1080		/*
1081		 * Shouldn't be able to turn off quotas here.
1082		 */
1083		ASSERT(error != -ESRCH);
1084		ASSERT(error != -ENOENT);
1085		return error;
1086	}
1087
1088	trace_xfs_dqadjust(dqp);
1089
1090	/*
1091	 * Adjust the inode count and the block count to reflect this inode's
1092	 * resource usage.
1093	 */
1094	be64_add_cpu(&dqp->q_core.d_icount, 1);
1095	dqp->q_res_icount++;
1096	if (nblks) {
1097		be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1098		dqp->q_res_bcount += nblks;
1099	}
1100	if (rtblks) {
1101		be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1102		dqp->q_res_rtbcount += rtblks;
1103	}
1104
1105	/*
1106	 * Set default limits, adjust timers (since we changed usages)
1107	 *
1108	 * There are no timers for the default values set in the root dquot.
1109	 */
1110	if (dqp->q_core.d_id) {
1111		xfs_qm_adjust_dqlimits(mp, dqp);
1112		xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1113	}
1114
1115	dqp->dq_flags |= XFS_DQ_DIRTY;
1116	xfs_qm_dqput(dqp);
1117	return 0;
1118}
1119
1120STATIC int
1121xfs_qm_get_rtblks(
1122	xfs_inode_t	*ip,
1123	xfs_qcnt_t	*O_rtblks)
1124{
1125	xfs_filblks_t	rtblks;			/* total rt blks */
1126	xfs_extnum_t	idx;			/* extent record index */
1127	xfs_ifork_t	*ifp;			/* inode fork pointer */
1128	xfs_extnum_t	nextents;		/* number of extent entries */
1129	int		error;
1130
1131	ASSERT(XFS_IS_REALTIME_INODE(ip));
1132	ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1133	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1134		if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1135			return error;
1136	}
1137	rtblks = 0;
1138	nextents = xfs_iext_count(ifp);
1139	for (idx = 0; idx < nextents; idx++)
1140		rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1141	*O_rtblks = (xfs_qcnt_t)rtblks;
1142	return 0;
1143}
1144
1145/*
1146 * callback routine supplied to bulkstat(). Given an inumber, find its
1147 * dquots and update them to account for resources taken by that inode.
1148 */
1149/* ARGSUSED */
1150STATIC int
1151xfs_qm_dqusage_adjust(
1152	xfs_mount_t	*mp,		/* mount point for filesystem */
1153	xfs_ino_t	ino,		/* inode number to get data for */
1154	void		__user *buffer,	/* not used */
1155	int		ubsize,		/* not used */
1156	int		*ubused,	/* not used */
1157	int		*res)		/* result code value */
1158{
1159	xfs_inode_t	*ip;
1160	xfs_qcnt_t	nblks, rtblks = 0;
1161	int		error;
1162
1163	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1164
1165	/*
1166	 * rootino must have its resources accounted for, not so with the quota
1167	 * inodes.
1168	 */
1169	if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1170		*res = BULKSTAT_RV_NOTHING;
1171		return -EINVAL;
1172	}
1173
1174	/*
1175	 * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1176	 * interface expects the inode to be exclusively locked because that's
1177	 * the case in all other instances. It's OK that we do this because
1178	 * quotacheck is done only at mount time.
1179	 */
1180	error = xfs_iget(mp, NULL, ino, XFS_IGET_DONTCACHE, XFS_ILOCK_EXCL,
1181			 &ip);
1182	if (error) {
1183		*res = BULKSTAT_RV_NOTHING;
1184		return error;
1185	}
1186
1187	ASSERT(ip->i_delayed_blks == 0);
1188
1189	if (XFS_IS_REALTIME_INODE(ip)) {
1190		/*
1191		 * Walk thru the extent list and count the realtime blocks.
1192		 */
1193		error = xfs_qm_get_rtblks(ip, &rtblks);
1194		if (error)
1195			goto error0;
1196	}
1197
1198	nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1199
1200	/*
1201	 * Add the (disk blocks and inode) resources occupied by this
1202	 * inode to its dquots. We do this adjustment in the incore dquot,
1203	 * and also copy the changes to its buffer.
1204	 * We don't care about putting these changes in a transaction
1205	 * envelope because if we crash in the middle of a 'quotacheck'
1206	 * we have to start from the beginning anyway.
1207	 * Once we're done, we'll log all the dquot bufs.
1208	 *
1209	 * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1210	 * and quotaoffs don't race. (Quotachecks happen at mount time only).
1211	 */
1212	if (XFS_IS_UQUOTA_ON(mp)) {
1213		error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1214						   XFS_DQ_USER, nblks, rtblks);
1215		if (error)
1216			goto error0;
1217	}
1218
1219	if (XFS_IS_GQUOTA_ON(mp)) {
1220		error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1221						   XFS_DQ_GROUP, nblks, rtblks);
1222		if (error)
1223			goto error0;
1224	}
1225
1226	if (XFS_IS_PQUOTA_ON(mp)) {
1227		error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1228						   XFS_DQ_PROJ, nblks, rtblks);
1229		if (error)
1230			goto error0;
1231	}
1232
1233	xfs_iunlock(ip, XFS_ILOCK_EXCL);
1234	IRELE(ip);
1235	*res = BULKSTAT_RV_DIDONE;
1236	return 0;
1237
1238error0:
1239	xfs_iunlock(ip, XFS_ILOCK_EXCL);
1240	IRELE(ip);
1241	*res = BULKSTAT_RV_GIVEUP;
1242	return error;
1243}
1244
1245STATIC int
1246xfs_qm_flush_one(
1247	struct xfs_dquot	*dqp,
1248	void			*data)
1249{
1250	struct list_head	*buffer_list = data;
1251	struct xfs_buf		*bp = NULL;
1252	int			error = 0;
1253
1254	xfs_dqlock(dqp);
1255	if (dqp->dq_flags & XFS_DQ_FREEING)
1256		goto out_unlock;
1257	if (!XFS_DQ_IS_DIRTY(dqp))
1258		goto out_unlock;
1259
1260	xfs_dqflock(dqp);
1261	error = xfs_qm_dqflush(dqp, &bp);
1262	if (error)
1263		goto out_unlock;
1264
1265	xfs_buf_delwri_queue(bp, buffer_list);
1266	xfs_buf_relse(bp);
1267out_unlock:
1268	xfs_dqunlock(dqp);
1269	return error;
1270}
1271
1272/*
1273 * Walk thru all the filesystem inodes and construct a consistent view
1274 * of the disk quota world. If the quotacheck fails, disable quotas.
1275 */
1276STATIC int
1277xfs_qm_quotacheck(
1278	xfs_mount_t	*mp)
1279{
1280	int			done, count, error, error2;
1281	xfs_ino_t		lastino;
1282	size_t			structsz;
1283	uint			flags;
1284	LIST_HEAD		(buffer_list);
1285	struct xfs_inode	*uip = mp->m_quotainfo->qi_uquotaip;
1286	struct xfs_inode	*gip = mp->m_quotainfo->qi_gquotaip;
1287	struct xfs_inode	*pip = mp->m_quotainfo->qi_pquotaip;
1288
1289	count = INT_MAX;
1290	structsz = 1;
1291	lastino = 0;
1292	flags = 0;
1293
1294	ASSERT(uip || gip || pip);
1295	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1296
1297	xfs_notice(mp, "Quotacheck needed: Please wait.");
1298
1299	/*
1300	 * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1301	 * their counters to zero. We need a clean slate.
1302	 * We don't log our changes till later.
1303	 */
1304	if (uip) {
1305		error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1306					 &buffer_list);
1307		if (error)
1308			goto error_return;
1309		flags |= XFS_UQUOTA_CHKD;
1310	}
1311
1312	if (gip) {
1313		error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1314					 &buffer_list);
1315		if (error)
1316			goto error_return;
1317		flags |= XFS_GQUOTA_CHKD;
1318	}
1319
1320	if (pip) {
1321		error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1322					 &buffer_list);
1323		if (error)
1324			goto error_return;
1325		flags |= XFS_PQUOTA_CHKD;
1326	}
1327
1328	do {
1329		/*
1330		 * Iterate thru all the inodes in the file system,
1331		 * adjusting the corresponding dquot counters in core.
1332		 */
1333		error = xfs_bulkstat(mp, &lastino, &count,
1334				     xfs_qm_dqusage_adjust,
1335				     structsz, NULL, &done);
1336		if (error)
1337			break;
1338
1339	} while (!done);
1340
1341	/*
1342	 * We've made all the changes that we need to make incore.  Flush them
1343	 * down to disk buffers if everything was updated successfully.
1344	 */
1345	if (XFS_IS_UQUOTA_ON(mp)) {
1346		error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1347					  &buffer_list);
1348	}
1349	if (XFS_IS_GQUOTA_ON(mp)) {
1350		error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1351					   &buffer_list);
1352		if (!error)
1353			error = error2;
1354	}
1355	if (XFS_IS_PQUOTA_ON(mp)) {
1356		error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1357					   &buffer_list);
1358		if (!error)
1359			error = error2;
1360	}
1361
1362	error2 = xfs_buf_delwri_submit(&buffer_list);
1363	if (!error)
1364		error = error2;
1365
1366	/*
1367	 * We can get this error if we couldn't do a dquot allocation inside
1368	 * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1369	 * dirty dquots that might be cached, we just want to get rid of them
1370	 * and turn quotaoff. The dquots won't be attached to any of the inodes
1371	 * at this point (because we intentionally didn't in dqget_noattach).
1372	 */
1373	if (error) {
1374		xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1375		goto error_return;
1376	}
1377
1378	/*
1379	 * If one type of quotas is off, then it will lose its
1380	 * quotachecked status, since we won't be doing accounting for
1381	 * that type anymore.
1382	 */
1383	mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1384	mp->m_qflags |= flags;
1385
1386 error_return:
1387	while (!list_empty(&buffer_list)) {
1388		struct xfs_buf *bp =
1389			list_first_entry(&buffer_list, struct xfs_buf, b_list);
1390		list_del_init(&bp->b_list);
1391		xfs_buf_relse(bp);
1392	}
1393
1394	if (error) {
1395		xfs_warn(mp,
1396	"Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1397			error);
1398		/*
1399		 * We must turn off quotas.
1400		 */
1401		ASSERT(mp->m_quotainfo != NULL);
1402		xfs_qm_destroy_quotainfo(mp);
1403		if (xfs_mount_reset_sbqflags(mp)) {
1404			xfs_warn(mp,
1405				"Quotacheck: Failed to reset quota flags.");
1406		}
1407	} else
1408		xfs_notice(mp, "Quotacheck: Done.");
1409	return error;
1410}
1411
1412/*
1413 * This is called from xfs_mountfs to start quotas and initialize all
1414 * necessary data structures like quotainfo.  This is also responsible for
1415 * running a quotacheck as necessary.  We are guaranteed that the superblock
1416 * is consistently read in at this point.
1417 *
1418 * If we fail here, the mount will continue with quota turned off. We don't
1419 * need to inidicate success or failure at all.
1420 */
1421void
1422xfs_qm_mount_quotas(
1423	struct xfs_mount	*mp)
1424{
1425	int			error = 0;
1426	uint			sbf;
1427
1428	/*
1429	 * If quotas on realtime volumes is not supported, we disable
1430	 * quotas immediately.
1431	 */
1432	if (mp->m_sb.sb_rextents) {
1433		xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
1434		mp->m_qflags = 0;
1435		goto write_changes;
1436	}
1437
1438	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1439
1440	/*
1441	 * Allocate the quotainfo structure inside the mount struct, and
1442	 * create quotainode(s), and change/rev superblock if necessary.
1443	 */
1444	error = xfs_qm_init_quotainfo(mp);
1445	if (error) {
1446		/*
1447		 * We must turn off quotas.
1448		 */
1449		ASSERT(mp->m_quotainfo == NULL);
1450		mp->m_qflags = 0;
1451		goto write_changes;
1452	}
1453	/*
1454	 * If any of the quotas are not consistent, do a quotacheck.
1455	 */
1456	if (XFS_QM_NEED_QUOTACHECK(mp)) {
1457		error = xfs_qm_quotacheck(mp);
1458		if (error) {
1459			/* Quotacheck failed and disabled quotas. */
1460			return;
1461		}
1462	}
1463	/*
1464	 * If one type of quotas is off, then it will lose its
1465	 * quotachecked status, since we won't be doing accounting for
1466	 * that type anymore.
1467	 */
1468	if (!XFS_IS_UQUOTA_ON(mp))
1469		mp->m_qflags &= ~XFS_UQUOTA_CHKD;
1470	if (!XFS_IS_GQUOTA_ON(mp))
1471		mp->m_qflags &= ~XFS_GQUOTA_CHKD;
1472	if (!XFS_IS_PQUOTA_ON(mp))
1473		mp->m_qflags &= ~XFS_PQUOTA_CHKD;
1474
1475 write_changes:
1476	/*
1477	 * We actually don't have to acquire the m_sb_lock at all.
1478	 * This can only be called from mount, and that's single threaded. XXX
1479	 */
1480	spin_lock(&mp->m_sb_lock);
1481	sbf = mp->m_sb.sb_qflags;
1482	mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
1483	spin_unlock(&mp->m_sb_lock);
1484
1485	if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
1486		if (xfs_sync_sb(mp, false)) {
1487			/*
1488			 * We could only have been turning quotas off.
1489			 * We aren't in very good shape actually because
1490			 * the incore structures are convinced that quotas are
1491			 * off, but the on disk superblock doesn't know that !
1492			 */
1493			ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
1494			xfs_alert(mp, "%s: Superblock update failed!",
1495				__func__);
1496		}
1497	}
1498
1499	if (error) {
1500		xfs_warn(mp, "Failed to initialize disk quotas.");
1501		return;
1502	}
1503}
1504
1505/*
1506 * This is called after the superblock has been read in and we're ready to
1507 * iget the quota inodes.
1508 */
1509STATIC int
1510xfs_qm_init_quotainos(
1511	xfs_mount_t	*mp)
1512{
1513	struct xfs_inode	*uip = NULL;
1514	struct xfs_inode	*gip = NULL;
1515	struct xfs_inode	*pip = NULL;
1516	int			error;
1517	uint			flags = 0;
1518
1519	ASSERT(mp->m_quotainfo);
1520
1521	/*
1522	 * Get the uquota and gquota inodes
1523	 */
1524	if (xfs_sb_version_hasquota(&mp->m_sb)) {
1525		if (XFS_IS_UQUOTA_ON(mp) &&
1526		    mp->m_sb.sb_uquotino != NULLFSINO) {
1527			ASSERT(mp->m_sb.sb_uquotino > 0);
1528			error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1529					     0, 0, &uip);
1530			if (error)
1531				return error;
1532		}
1533		if (XFS_IS_GQUOTA_ON(mp) &&
1534		    mp->m_sb.sb_gquotino != NULLFSINO) {
1535			ASSERT(mp->m_sb.sb_gquotino > 0);
1536			error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1537					     0, 0, &gip);
1538			if (error)
1539				goto error_rele;
1540		}
1541		if (XFS_IS_PQUOTA_ON(mp) &&
1542		    mp->m_sb.sb_pquotino != NULLFSINO) {
1543			ASSERT(mp->m_sb.sb_pquotino > 0);
1544			error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
1545					     0, 0, &pip);
1546			if (error)
1547				goto error_rele;
1548		}
1549	} else {
1550		flags |= XFS_QMOPT_SBVERSION;
1551	}
1552
1553	/*
1554	 * Create the three inodes, if they don't exist already. The changes
1555	 * made above will get added to a transaction and logged in one of
1556	 * the qino_alloc calls below.  If the device is readonly,
1557	 * temporarily switch to read-write to do this.
1558	 */
1559	if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1560		error = xfs_qm_qino_alloc(mp, &uip,
1561					      flags | XFS_QMOPT_UQUOTA);
1562		if (error)
1563			goto error_rele;
1564
1565		flags &= ~XFS_QMOPT_SBVERSION;
1566	}
1567	if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1568		error = xfs_qm_qino_alloc(mp, &gip,
1569					  flags | XFS_QMOPT_GQUOTA);
1570		if (error)
1571			goto error_rele;
1572
1573		flags &= ~XFS_QMOPT_SBVERSION;
1574	}
1575	if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1576		error = xfs_qm_qino_alloc(mp, &pip,
1577					  flags | XFS_QMOPT_PQUOTA);
1578		if (error)
1579			goto error_rele;
1580	}
1581
1582	mp->m_quotainfo->qi_uquotaip = uip;
1583	mp->m_quotainfo->qi_gquotaip = gip;
1584	mp->m_quotainfo->qi_pquotaip = pip;
1585
1586	return 0;
1587
1588error_rele:
1589	if (uip)
1590		IRELE(uip);
1591	if (gip)
1592		IRELE(gip);
1593	if (pip)
1594		IRELE(pip);
1595	return error;
1596}
1597
1598STATIC void
1599xfs_qm_dqfree_one(
1600	struct xfs_dquot	*dqp)
1601{
1602	struct xfs_mount	*mp = dqp->q_mount;
1603	struct xfs_quotainfo	*qi = mp->m_quotainfo;
1604
1605	mutex_lock(&qi->qi_tree_lock);
1606	radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1607			  be32_to_cpu(dqp->q_core.d_id));
1608
1609	qi->qi_dquots--;
1610	mutex_unlock(&qi->qi_tree_lock);
1611
1612	xfs_qm_dqdestroy(dqp);
1613}
1614
1615/* --------------- utility functions for vnodeops ---------------- */
1616
1617
1618/*
1619 * Given an inode, a uid, gid and prid make sure that we have
1620 * allocated relevant dquot(s) on disk, and that we won't exceed inode
1621 * quotas by creating this file.
1622 * This also attaches dquot(s) to the given inode after locking it,
1623 * and returns the dquots corresponding to the uid and/or gid.
1624 *
1625 * in	: inode (unlocked)
1626 * out	: udquot, gdquot with references taken and unlocked
1627 */
1628int
1629xfs_qm_vop_dqalloc(
1630	struct xfs_inode	*ip,
1631	xfs_dqid_t		uid,
1632	xfs_dqid_t		gid,
1633	prid_t			prid,
1634	uint			flags,
1635	struct xfs_dquot	**O_udqpp,
1636	struct xfs_dquot	**O_gdqpp,
1637	struct xfs_dquot	**O_pdqpp)
1638{
1639	struct xfs_mount	*mp = ip->i_mount;
1640	struct xfs_dquot	*uq = NULL;
1641	struct xfs_dquot	*gq = NULL;
1642	struct xfs_dquot	*pq = NULL;
1643	int			error;
1644	uint			lockflags;
1645
1646	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1647		return 0;
1648
1649	lockflags = XFS_ILOCK_EXCL;
1650	xfs_ilock(ip, lockflags);
1651
1652	if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1653		gid = ip->i_d.di_gid;
1654
1655	/*
1656	 * Attach the dquot(s) to this inode, doing a dquot allocation
1657	 * if necessary. The dquot(s) will not be locked.
1658	 */
1659	if (XFS_NOT_DQATTACHED(mp, ip)) {
1660		error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1661		if (error) {
1662			xfs_iunlock(ip, lockflags);
1663			return error;
1664		}
1665	}
1666
1667	if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1668		if (ip->i_d.di_uid != uid) {
1669			/*
1670			 * What we need is the dquot that has this uid, and
1671			 * if we send the inode to dqget, the uid of the inode
1672			 * takes priority over what's sent in the uid argument.
1673			 * We must unlock inode here before calling dqget if
1674			 * we're not sending the inode, because otherwise
1675			 * we'll deadlock by doing trans_reserve while
1676			 * holding ilock.
1677			 */
1678			xfs_iunlock(ip, lockflags);
1679			error = xfs_qm_dqget(mp, NULL, uid,
1680						 XFS_DQ_USER,
1681						 XFS_QMOPT_DQALLOC |
1682						 XFS_QMOPT_DOWARN,
1683						 &uq);
1684			if (error) {
1685				ASSERT(error != -ENOENT);
1686				return error;
1687			}
1688			/*
1689			 * Get the ilock in the right order.
1690			 */
1691			xfs_dqunlock(uq);
1692			lockflags = XFS_ILOCK_SHARED;
1693			xfs_ilock(ip, lockflags);
1694		} else {
1695			/*
1696			 * Take an extra reference, because we'll return
1697			 * this to caller
1698			 */
1699			ASSERT(ip->i_udquot);
1700			uq = xfs_qm_dqhold(ip->i_udquot);
1701		}
1702	}
1703	if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1704		if (ip->i_d.di_gid != gid) {
1705			xfs_iunlock(ip, lockflags);
1706			error = xfs_qm_dqget(mp, NULL, gid,
1707						 XFS_DQ_GROUP,
1708						 XFS_QMOPT_DQALLOC |
1709						 XFS_QMOPT_DOWARN,
1710						 &gq);
1711			if (error) {
1712				ASSERT(error != -ENOENT);
1713				goto error_rele;
1714			}
1715			xfs_dqunlock(gq);
1716			lockflags = XFS_ILOCK_SHARED;
1717			xfs_ilock(ip, lockflags);
1718		} else {
1719			ASSERT(ip->i_gdquot);
1720			gq = xfs_qm_dqhold(ip->i_gdquot);
1721		}
1722	}
1723	if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1724		if (xfs_get_projid(ip) != prid) {
1725			xfs_iunlock(ip, lockflags);
1726			error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1727						 XFS_DQ_PROJ,
1728						 XFS_QMOPT_DQALLOC |
1729						 XFS_QMOPT_DOWARN,
1730						 &pq);
1731			if (error) {
1732				ASSERT(error != -ENOENT);
1733				goto error_rele;
1734			}
1735			xfs_dqunlock(pq);
1736			lockflags = XFS_ILOCK_SHARED;
1737			xfs_ilock(ip, lockflags);
1738		} else {
1739			ASSERT(ip->i_pdquot);
1740			pq = xfs_qm_dqhold(ip->i_pdquot);
1741		}
1742	}
1743	if (uq)
1744		trace_xfs_dquot_dqalloc(ip);
1745
1746	xfs_iunlock(ip, lockflags);
1747	if (O_udqpp)
1748		*O_udqpp = uq;
1749	else
1750		xfs_qm_dqrele(uq);
1751	if (O_gdqpp)
1752		*O_gdqpp = gq;
1753	else
1754		xfs_qm_dqrele(gq);
1755	if (O_pdqpp)
1756		*O_pdqpp = pq;
1757	else
1758		xfs_qm_dqrele(pq);
1759	return 0;
1760
1761error_rele:
1762	xfs_qm_dqrele(gq);
1763	xfs_qm_dqrele(uq);
1764	return error;
1765}
1766
1767/*
1768 * Actually transfer ownership, and do dquot modifications.
1769 * These were already reserved.
1770 */
1771xfs_dquot_t *
1772xfs_qm_vop_chown(
1773	xfs_trans_t	*tp,
1774	xfs_inode_t	*ip,
1775	xfs_dquot_t	**IO_olddq,
1776	xfs_dquot_t	*newdq)
1777{
1778	xfs_dquot_t	*prevdq;
1779	uint		bfield = XFS_IS_REALTIME_INODE(ip) ?
1780				 XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1781
1782
1783	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1784	ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1785
1786	/* old dquot */
1787	prevdq = *IO_olddq;
1788	ASSERT(prevdq);
1789	ASSERT(prevdq != newdq);
1790
1791	xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1792	xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1793
1794	/* the sparkling new dquot */
1795	xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1796	xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1797
1798	/*
1799	 * Take an extra reference, because the inode is going to keep
1800	 * this dquot pointer even after the trans_commit.
1801	 */
1802	*IO_olddq = xfs_qm_dqhold(newdq);
1803
1804	return prevdq;
1805}
1806
1807/*
1808 * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1809 */
1810int
1811xfs_qm_vop_chown_reserve(
1812	struct xfs_trans	*tp,
1813	struct xfs_inode	*ip,
1814	struct xfs_dquot	*udqp,
1815	struct xfs_dquot	*gdqp,
1816	struct xfs_dquot	*pdqp,
1817	uint			flags)
1818{
1819	struct xfs_mount	*mp = ip->i_mount;
1820	uint			delblks, blkflags, prjflags = 0;
1821	struct xfs_dquot	*udq_unres = NULL;
1822	struct xfs_dquot	*gdq_unres = NULL;
1823	struct xfs_dquot	*pdq_unres = NULL;
1824	struct xfs_dquot	*udq_delblks = NULL;
1825	struct xfs_dquot	*gdq_delblks = NULL;
1826	struct xfs_dquot	*pdq_delblks = NULL;
1827	int			error;
1828
1829
1830	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1831	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1832
1833	delblks = ip->i_delayed_blks;
1834	blkflags = XFS_IS_REALTIME_INODE(ip) ?
1835			XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1836
1837	if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1838	    ip->i_d.di_uid != be32_to_cpu(udqp->q_core.d_id)) {
1839		udq_delblks = udqp;
1840		/*
1841		 * If there are delayed allocation blocks, then we have to
1842		 * unreserve those from the old dquot, and add them to the
1843		 * new dquot.
1844		 */
1845		if (delblks) {
1846			ASSERT(ip->i_udquot);
1847			udq_unres = ip->i_udquot;
1848		}
1849	}
1850	if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1851	    ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1852		gdq_delblks = gdqp;
1853		if (delblks) {
1854			ASSERT(ip->i_gdquot);
1855			gdq_unres = ip->i_gdquot;
1856		}
1857	}
1858
1859	if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1860	    xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1861		prjflags = XFS_QMOPT_ENOSPC;
1862		pdq_delblks = pdqp;
1863		if (delblks) {
1864			ASSERT(ip->i_pdquot);
1865			pdq_unres = ip->i_pdquot;
1866		}
1867	}
1868
1869	error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1870				udq_delblks, gdq_delblks, pdq_delblks,
1871				ip->i_d.di_nblocks, 1,
1872				flags | blkflags | prjflags);
1873	if (error)
1874		return error;
1875
1876	/*
1877	 * Do the delayed blks reservations/unreservations now. Since, these
1878	 * are done without the help of a transaction, if a reservation fails
1879	 * its previous reservations won't be automatically undone by trans
1880	 * code. So, we have to do it manually here.
1881	 */
1882	if (delblks) {
1883		/*
1884		 * Do the reservations first. Unreservation can't fail.
1885		 */
1886		ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1887		ASSERT(udq_unres || gdq_unres || pdq_unres);
1888		error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1889			    udq_delblks, gdq_delblks, pdq_delblks,
1890			    (xfs_qcnt_t)delblks, 0,
1891			    flags | blkflags | prjflags);
1892		if (error)
1893			return error;
1894		xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1895				udq_unres, gdq_unres, pdq_unres,
1896				-((xfs_qcnt_t)delblks), 0, blkflags);
1897	}
1898
1899	return 0;
1900}
1901
1902int
1903xfs_qm_vop_rename_dqattach(
1904	struct xfs_inode	**i_tab)
1905{
1906	struct xfs_mount	*mp = i_tab[0]->i_mount;
1907	int			i;
1908
1909	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1910		return 0;
1911
1912	for (i = 0; (i < 4 && i_tab[i]); i++) {
1913		struct xfs_inode	*ip = i_tab[i];
1914		int			error;
1915
1916		/*
1917		 * Watch out for duplicate entries in the table.
1918		 */
1919		if (i == 0 || ip != i_tab[i-1]) {
1920			if (XFS_NOT_DQATTACHED(mp, ip)) {
1921				error = xfs_qm_dqattach(ip, 0);
1922				if (error)
1923					return error;
1924			}
1925		}
1926	}
1927	return 0;
1928}
1929
1930void
1931xfs_qm_vop_create_dqattach(
1932	struct xfs_trans	*tp,
1933	struct xfs_inode	*ip,
1934	struct xfs_dquot	*udqp,
1935	struct xfs_dquot	*gdqp,
1936	struct xfs_dquot	*pdqp)
1937{
1938	struct xfs_mount	*mp = tp->t_mountp;
1939
1940	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1941		return;
1942
1943	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1944	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1945
1946	if (udqp && XFS_IS_UQUOTA_ON(mp)) {
1947		ASSERT(ip->i_udquot == NULL);
1948		ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1949
1950		ip->i_udquot = xfs_qm_dqhold(udqp);
1951		xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1952	}
1953	if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
1954		ASSERT(ip->i_gdquot == NULL);
1955		ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
1956		ip->i_gdquot = xfs_qm_dqhold(gdqp);
1957		xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1958	}
1959	if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
1960		ASSERT(ip->i_pdquot == NULL);
1961		ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
1962
1963		ip->i_pdquot = xfs_qm_dqhold(pdqp);
1964		xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
1965	}
1966}
1967