/fs/xfs/xfs_qm.c

   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_bit.h"
  21#include "xfs_log.h"
  22#include "xfs_trans.h"
  23#include "xfs_sb.h"
  24#include "xfs_ag.h"
  25#include "xfs_alloc.h"
  26#include "xfs_quota.h"
  27#include "xfs_mount.h"
  28#include "xfs_bmap_btree.h"
  29#include "xfs_ialloc_btree.h"
  30#include "xfs_dinode.h"
  31#include "xfs_inode.h"
  32#include "xfs_ialloc.h"
  33#include "xfs_itable.h"
  34#include "xfs_rtalloc.h"
  35#include "xfs_error.h"
  36#include "xfs_bmap.h"
  37#include "xfs_attr.h"
  38#include "xfs_buf_item.h"
  39#include "xfs_trans_space.h"
  40#include "xfs_utils.h"
  41#include "xfs_qm.h"
  42#include "xfs_trace.h"
  43#include "xfs_icache.h"
  44
  45/*
  46 * The global quota manager. There is only one of these for the entire
  47 * system, _not_ one per file system. XQM keeps track of the overall
  48 * quota functionality, including maintaining the freelist and hash
  49 * tables of dquots.
  50 */
  51STATIC int	xfs_qm_init_quotainos(xfs_mount_t *);
  52STATIC int	xfs_qm_init_quotainfo(xfs_mount_t *);
  53STATIC int	xfs_qm_shake(struct shrinker *, struct shrink_control *);
  54
  55/*
  56 * We use the batch lookup interface to iterate over the dquots as it
  57 * currently is the only interface into the radix tree code that allows
  58 * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  59 * operations is fine as all callers are used either during mount/umount
  60 * or quotaoff.
  61 */
  62#define XFS_DQ_LOOKUP_BATCH	32
  63
  64STATIC int
  65xfs_qm_dquot_walk(
  66	struct xfs_mount	*mp,
  67	int			type,
  68	int			(*execute)(struct xfs_dquot *dqp, void *data),
  69	void			*data)
  70{
  71	struct xfs_quotainfo	*qi = mp->m_quotainfo;
  72	struct radix_tree_root	*tree = XFS_DQUOT_TREE(qi, type);
  73	uint32_t		next_index;
  74	int			last_error = 0;
  75	int			skipped;
  76	int			nr_found;
  77
  78restart:
  79	skipped = 0;
  80	next_index = 0;
  81	nr_found = 0;
  82
  83	while (1) {
  84		struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  85		int		error = 0;
  86		int		i;
  87
  88		mutex_lock(&qi->qi_tree_lock);
  89		nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  90					next_index, XFS_DQ_LOOKUP_BATCH);
  91		if (!nr_found) {
  92			mutex_unlock(&qi->qi_tree_lock);
  93			break;
  94		}
  95
  96		for (i = 0; i < nr_found; i++) {
  97			struct xfs_dquot *dqp = batch[i];
  98
  99			next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
 100
 101			error = execute(batch[i], data);
 102			if (error == EAGAIN) {
 103				skipped++;
 104				continue;
 105			}
 106			if (error && last_error != EFSCORRUPTED)
 107				last_error = error;
 108		}
 109
 110		mutex_unlock(&qi->qi_tree_lock);
 111
 112		/* bail out if the filesystem is corrupted.  */
 113		if (last_error == EFSCORRUPTED) {
 114			skipped = 0;
 115			break;
 116		}
 117	}
 118
 119	if (skipped) {
 120		delay(1);
 121		goto restart;
 122	}
 123
 124	return last_error;
 125}
 126
 127
 128/*
 129 * Purge a dquot from all tracking data structures and free it.
 130 */
 131STATIC int
 132xfs_qm_dqpurge(
 133	struct xfs_dquot	*dqp,
 134	void			*data)
 135{
 136	struct xfs_mount	*mp = dqp->q_mount;
 137	struct xfs_quotainfo	*qi = mp->m_quotainfo;
 138
 139	xfs_dqlock(dqp);
 140	if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 141		xfs_dqunlock(dqp);
 142		return EAGAIN;
 143	}
 144
 145	dqp->dq_flags |= XFS_DQ_FREEING;
 146
 147	xfs_dqflock(dqp);
 148
 149	/*
 150	 * If we are turning this type of quotas off, we don't care
 151	 * about the dirty metadata sitting in this dquot. OTOH, if
 152	 * we're unmounting, we do care, so we flush it and wait.
 153	 */
 154	if (XFS_DQ_IS_DIRTY(dqp)) {
 155		struct xfs_buf	*bp = NULL;
 156		int		error;
 157
 158		/*
 159		 * We don't care about getting disk errors here. We need
 160		 * to purge this dquot anyway, so we go ahead regardless.
 161		 */
 162		error = xfs_qm_dqflush(dqp, &bp);
 163		if (error) {
 164			xfs_warn(mp, "%s: dquot %p flush failed",
 165				__func__, dqp);
 166		} else {
 167			error = xfs_bwrite(bp);
 168			xfs_buf_relse(bp);
 169		}
 170		xfs_dqflock(dqp);
 171	}
 172
 173	ASSERT(atomic_read(&dqp->q_pincount) == 0);
 174	ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 175	       !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 176
 177	xfs_dqfunlock(dqp);
 178	xfs_dqunlock(dqp);
 179
 180	radix_tree_delete(XFS_DQUOT_TREE(qi, dqp->q_core.d_flags),
 181			  be32_to_cpu(dqp->q_core.d_id));
 182	qi->qi_dquots--;
 183
 184	/*
 185	 * We move dquots to the freelist as soon as their reference count
 186	 * hits zero, so it really should be on the freelist here.
 187	 */
 188	mutex_lock(&qi->qi_lru_lock);
 189	ASSERT(!list_empty(&dqp->q_lru));
 190	list_del_init(&dqp->q_lru);
 191	qi->qi_lru_count--;
 192	XFS_STATS_DEC(xs_qm_dquot_unused);
 193	mutex_unlock(&qi->qi_lru_lock);
 194
 195	xfs_qm_dqdestroy(dqp);
 196	return 0;
 197}
 198
 199/*
 200 * Release the group or project dquot pointers the user dquots maybe carrying
 201 * around as a hint, and proceed to purge the user dquot cache if requested.
 202*/
 203STATIC int
 204xfs_qm_dqpurge_hints(
 205	struct xfs_dquot	*dqp,
 206	void			*data)
 207{
 208	struct xfs_dquot	*gdqp = NULL;
 209	uint			flags = *((uint *)data);
 210
 211	xfs_dqlock(dqp);
 212	if (dqp->dq_flags & XFS_DQ_FREEING) {
 213		xfs_dqunlock(dqp);
 214		return EAGAIN;
 215	}
 216
 217	/* If this quota has a hint attached, prepare for releasing it now */
 218	gdqp = dqp->q_gdquot;
 219	if (gdqp)
 220		dqp->q_gdquot = NULL;
 221
 222	xfs_dqunlock(dqp);
 223
 224	if (gdqp)
 225		xfs_qm_dqrele(gdqp);
 226
 227	if (flags & XFS_QMOPT_UQUOTA)
 228		return xfs_qm_dqpurge(dqp, NULL);
 229
 230	return 0;
 231}
 232
 233/*
 234 * Purge the dquot cache.
 235 */
 236void
 237xfs_qm_dqpurge_all(
 238	struct xfs_mount	*mp,
 239	uint			flags)
 240{
 241	/*
 242	 * We have to release group/project dquot hint(s) from the user dquot
 243	 * at first if they are there, otherwise we would run into an infinite
 244	 * loop while walking through radix tree to purge other type of dquots
 245	 * since their refcount is not zero if the user dquot refers to them
 246	 * as hint.
 247	 *
 248	 * Call the special xfs_qm_dqpurge_hints() will end up go through the
 249	 * general xfs_qm_dqpurge() against user dquot cache if requested.
 250	 */
 251	xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge_hints, &flags);
 252
 253	if (flags & XFS_QMOPT_GQUOTA)
 254		xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 255	if (flags & XFS_QMOPT_PQUOTA)
 256		xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 257}
 258
 259/*
 260 * Just destroy the quotainfo structure.
 261 */
 262void
 263xfs_qm_unmount(
 264	struct xfs_mount	*mp)
 265{
 266	if (mp->m_quotainfo) {
 267		xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 268		xfs_qm_destroy_quotainfo(mp);
 269	}
 270}
 271
 272
 273/*
 274 * This is called from xfs_mountfs to start quotas and initialize all
 275 * necessary data structures like quotainfo.  This is also responsible for
 276 * running a quotacheck as necessary.  We are guaranteed that the superblock
 277 * is consistently read in at this point.
 278 *
 279 * If we fail here, the mount will continue with quota turned off. We don't
 280 * need to inidicate success or failure at all.
 281 */
 282void
 283xfs_qm_mount_quotas(
 284	xfs_mount_t	*mp)
 285{
 286	int		error = 0;
 287	uint		sbf;
 288
 289	/*
 290	 * If quotas on realtime volumes is not supported, we disable
 291	 * quotas immediately.
 292	 */
 293	if (mp->m_sb.sb_rextents) {
 294		xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
 295		mp->m_qflags = 0;
 296		goto write_changes;
 297	}
 298
 299	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 300
 301	/*
 302	 * Allocate the quotainfo structure inside the mount struct, and
 303	 * create quotainode(s), and change/rev superblock if necessary.
 304	 */
 305	error = xfs_qm_init_quotainfo(mp);
 306	if (error) {
 307		/*
 308		 * We must turn off quotas.
 309		 */
 310		ASSERT(mp->m_quotainfo == NULL);
 311		mp->m_qflags = 0;
 312		goto write_changes;
 313	}
 314	/*
 315	 * If any of the quotas are not consistent, do a quotacheck.
 316	 */
 317	if (XFS_QM_NEED_QUOTACHECK(mp)) {
 318		error = xfs_qm_quotacheck(mp);
 319		if (error) {
 320			/* Quotacheck failed and disabled quotas. */
 321			return;
 322		}
 323	}
 324	/* 
 325	 * If one type of quotas is off, then it will lose its
 326	 * quotachecked status, since we won't be doing accounting for
 327	 * that type anymore.
 328	 */
 329	if (!XFS_IS_UQUOTA_ON(mp))
 330		mp->m_qflags &= ~XFS_UQUOTA_CHKD;
 331	if (!(XFS_IS_GQUOTA_ON(mp) || XFS_IS_PQUOTA_ON(mp)))
 332		mp->m_qflags &= ~XFS_OQUOTA_CHKD;
 333
 334 write_changes:
 335	/*
 336	 * We actually don't have to acquire the m_sb_lock at all.
 337	 * This can only be called from mount, and that's single threaded. XXX
 338	 */
 339	spin_lock(&mp->m_sb_lock);
 340	sbf = mp->m_sb.sb_qflags;
 341	mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
 342	spin_unlock(&mp->m_sb_lock);
 343
 344	if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
 345		if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
 346			/*
 347			 * We could only have been turning quotas off.
 348			 * We aren't in very good shape actually because
 349			 * the incore structures are convinced that quotas are
 350			 * off, but the on disk superblock doesn't know that !
 351			 */
 352			ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
 353			xfs_alert(mp, "%s: Superblock update failed!",
 354				__func__);
 355		}
 356	}
 357
 358	if (error) {
 359		xfs_warn(mp, "Failed to initialize disk quotas.");
 360		return;
 361	}
 362}
 363
 364/*
 365 * Called from the vfsops layer.
 366 */
 367void
 368xfs_qm_unmount_quotas(
 369	xfs_mount_t	*mp)
 370{
 371	/*
 372	 * Release the dquots that root inode, et al might be holding,
 373	 * before we flush quotas and blow away the quotainfo structure.
 374	 */
 375	ASSERT(mp->m_rootip);
 376	xfs_qm_dqdetach(mp->m_rootip);
 377	if (mp->m_rbmip)
 378		xfs_qm_dqdetach(mp->m_rbmip);
 379	if (mp->m_rsumip)
 380		xfs_qm_dqdetach(mp->m_rsumip);
 381
 382	/*
 383	 * Release the quota inodes.
 384	 */
 385	if (mp->m_quotainfo) {
 386		if (mp->m_quotainfo->qi_uquotaip) {
 387			IRELE(mp->m_quotainfo->qi_uquotaip);
 388			mp->m_quotainfo->qi_uquotaip = NULL;
 389		}
 390		if (mp->m_quotainfo->qi_gquotaip) {
 391			IRELE(mp->m_quotainfo->qi_gquotaip);
 392			mp->m_quotainfo->qi_gquotaip = NULL;
 393		}
 394	}
 395}
 396
 397STATIC int
 398xfs_qm_dqattach_one(
 399	xfs_inode_t	*ip,
 400	xfs_dqid_t	id,
 401	uint		type,
 402	uint		doalloc,
 403	xfs_dquot_t	*udqhint, /* hint */
 404	xfs_dquot_t	**IO_idqpp)
 405{
 406	xfs_dquot_t	*dqp;
 407	int		error;
 408
 409	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 410	error = 0;
 411
 412	/*
 413	 * See if we already have it in the inode itself. IO_idqpp is
 414	 * &i_udquot or &i_gdquot. This made the code look weird, but
 415	 * made the logic a lot simpler.
 416	 */
 417	dqp = *IO_idqpp;
 418	if (dqp) {
 419		trace_xfs_dqattach_found(dqp);
 420		return 0;
 421	}
 422
 423	/*
 424	 * udqhint is the i_udquot field in inode, and is non-NULL only
 425	 * when the type arg is group/project. Its purpose is to save a
 426	 * lookup by dqid (xfs_qm_dqget) by caching a group dquot inside
 427	 * the user dquot.
 428	 */
 429	if (udqhint) {
 430		ASSERT(type == XFS_DQ_GROUP || type == XFS_DQ_PROJ);
 431		xfs_dqlock(udqhint);
 432
 433		/*
 434		 * No need to take dqlock to look at the id.
 435		 *
 436		 * The ID can't change until it gets reclaimed, and it won't
 437		 * be reclaimed as long as we have a ref from inode and we
 438		 * hold the ilock.
 439		 */
 440		dqp = udqhint->q_gdquot;
 441		if (dqp && be32_to_cpu(dqp->q_core.d_id) == id) {
 442			ASSERT(*IO_idqpp == NULL);
 443
 444			*IO_idqpp = xfs_qm_dqhold(dqp);
 445			xfs_dqunlock(udqhint);
 446			return 0;
 447		}
 448
 449		/*
 450		 * We can't hold a dquot lock when we call the dqget code.
 451		 * We'll deadlock in no time, because of (not conforming to)
 452		 * lock ordering - the inodelock comes before any dquot lock,
 453		 * and we may drop and reacquire the ilock in xfs_qm_dqget().
 454		 */
 455		xfs_dqunlock(udqhint);
 456	}
 457
 458	/*
 459	 * Find the dquot from somewhere. This bumps the
 460	 * reference count of dquot and returns it locked.
 461	 * This can return ENOENT if dquot didn't exist on
 462	 * disk and we didn't ask it to allocate;
 463	 * ESRCH if quotas got turned off suddenly.
 464	 */
 465	error = xfs_qm_dqget(ip->i_mount, ip, id, type,
 466			     doalloc | XFS_QMOPT_DOWARN, &dqp);
 467	if (error)
 468		return error;
 469
 470	trace_xfs_dqattach_get(dqp);
 471
 472	/*
 473	 * dqget may have dropped and re-acquired the ilock, but it guarantees
 474	 * that the dquot returned is the one that should go in the inode.
 475	 */
 476	*IO_idqpp = dqp;
 477	xfs_dqunlock(dqp);
 478	return 0;
 479}
 480
 481
 482/*
 483 * Given a udquot and gdquot, attach a ptr to the group dquot in the
 484 * udquot as a hint for future lookups.
 485 */
 486STATIC void
 487xfs_qm_dqattach_grouphint(
 488	xfs_dquot_t	*udq,
 489	xfs_dquot_t	*gdq)
 490{
 491	xfs_dquot_t	*tmp;
 492
 493	xfs_dqlock(udq);
 494
 495	tmp = udq->q_gdquot;
 496	if (tmp) {
 497		if (tmp == gdq)
 498			goto done;
 499
 500		udq->q_gdquot = NULL;
 501		xfs_qm_dqrele(tmp);
 502	}
 503
 504	udq->q_gdquot = xfs_qm_dqhold(gdq);
 505done:
 506	xfs_dqunlock(udq);
 507}
 508
 509static bool
 510xfs_qm_need_dqattach(
 511	struct xfs_inode	*ip)
 512{
 513	struct xfs_mount	*mp = ip->i_mount;
 514
 515	if (!XFS_IS_QUOTA_RUNNING(mp))
 516		return false;
 517	if (!XFS_IS_QUOTA_ON(mp))
 518		return false;
 519	if (!XFS_NOT_DQATTACHED(mp, ip))
 520		return false;
 521	if (ip->i_ino == mp->m_sb.sb_uquotino ||
 522	    ip->i_ino == mp->m_sb.sb_gquotino)
 523		return false;
 524	return true;
 525}
 526
 527/*
 528 * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 529 * into account.
 530 * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 531 * Inode may get unlocked and relocked in here, and the caller must deal with
 532 * the consequences.
 533 */
 534int
 535xfs_qm_dqattach_locked(
 536	xfs_inode_t	*ip,
 537	uint		flags)
 538{
 539	xfs_mount_t	*mp = ip->i_mount;
 540	uint		nquotas = 0;
 541	int		error = 0;
 542
 543	if (!xfs_qm_need_dqattach(ip))
 544		return 0;
 545
 546	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 547
 548	if (XFS_IS_UQUOTA_ON(mp)) {
 549		error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 550						flags & XFS_QMOPT_DQALLOC,
 551						NULL, &ip->i_udquot);
 552		if (error)
 553			goto done;
 554		nquotas++;
 555	}
 556
 557	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 558	if (XFS_IS_OQUOTA_ON(mp)) {
 559		error = XFS_IS_GQUOTA_ON(mp) ?
 560			xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 561						flags & XFS_QMOPT_DQALLOC,
 562						ip->i_udquot, &ip->i_gdquot) :
 563			xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 564						flags & XFS_QMOPT_DQALLOC,
 565						ip->i_udquot, &ip->i_gdquot);
 566		/*
 567		 * Don't worry about the udquot that we may have
 568		 * attached above. It'll get detached, if not already.
 569		 */
 570		if (error)
 571			goto done;
 572		nquotas++;
 573	}
 574
 575	/*
 576	 * Attach this group quota to the user quota as a hint.
 577	 * This WON'T, in general, result in a thrash.
 578	 */
 579	if (nquotas == 2) {
 580		ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 581		ASSERT(ip->i_udquot);
 582		ASSERT(ip->i_gdquot);
 583
 584		/*
 585		 * We do not have i_udquot locked at this point, but this check
 586		 * is OK since we don't depend on the i_gdquot to be accurate
 587		 * 100% all the time. It is just a hint, and this will
 588		 * succeed in general.
 589		 */
 590		if (ip->i_udquot->q_gdquot != ip->i_gdquot)
 591			xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot);
 592	}
 593
 594 done:
 595#ifdef DEBUG
 596	if (!error) {
 597		if (XFS_IS_UQUOTA_ON(mp))
 598			ASSERT(ip->i_udquot);
 599		if (XFS_IS_OQUOTA_ON(mp))
 600			ASSERT(ip->i_gdquot);
 601	}
 602	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 603#endif
 604	return error;
 605}
 606
 607int
 608xfs_qm_dqattach(
 609	struct xfs_inode	*ip,
 610	uint			flags)
 611{
 612	int			error;
 613
 614	if (!xfs_qm_need_dqattach(ip))
 615		return 0;
 616
 617	xfs_ilock(ip, XFS_ILOCK_EXCL);
 618	error = xfs_qm_dqattach_locked(ip, flags);
 619	xfs_iunlock(ip, XFS_ILOCK_EXCL);
 620
 621	return error;
 622}
 623
 624/*
 625 * Release dquots (and their references) if any.
 626 * The inode should be locked EXCL except when this's called by
 627 * xfs_ireclaim.
 628 */
 629void
 630xfs_qm_dqdetach(
 631	xfs_inode_t	*ip)
 632{
 633	if (!(ip->i_udquot || ip->i_gdquot))
 634		return;
 635
 636	trace_xfs_dquot_dqdetach(ip);
 637
 638	ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_uquotino);
 639	ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_gquotino);
 640	if (ip->i_udquot) {
 641		xfs_qm_dqrele(ip->i_udquot);
 642		ip->i_udquot = NULL;
 643	}
 644	if (ip->i_gdquot) {
 645		xfs_qm_dqrele(ip->i_gdquot);
 646		ip->i_gdquot = NULL;
 647	}
 648}
 649
 650/*
 651 * This initializes all the quota information that's kept in the
 652 * mount structure
 653 */
 654STATIC int
 655xfs_qm_init_quotainfo(
 656	xfs_mount_t	*mp)
 657{
 658	xfs_quotainfo_t *qinf;
 659	int		error;
 660	xfs_dquot_t	*dqp;
 661
 662	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 663
 664	qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 665
 666	/*
 667	 * See if quotainodes are setup, and if not, allocate them,
 668	 * and change the superblock accordingly.
 669	 */
 670	if ((error = xfs_qm_init_quotainos(mp))) {
 671		kmem_free(qinf);
 672		mp->m_quotainfo = NULL;
 673		return error;
 674	}
 675
 676	INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 677	INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 678	mutex_init(&qinf->qi_tree_lock);
 679
 680	INIT_LIST_HEAD(&qinf->qi_lru_list);
 681	qinf->qi_lru_count = 0;
 682	mutex_init(&qinf->qi_lru_lock);
 683
 684	/* mutex used to serialize quotaoffs */
 685	mutex_init(&qinf->qi_quotaofflock);
 686
 687	/* Precalc some constants */
 688	qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 689	ASSERT(qinf->qi_dqchunklen);
 690	qinf->qi_dqperchunk = BBTOB(qinf->qi_dqchunklen);
 691	do_div(qinf->qi_dqperchunk, sizeof(xfs_dqblk_t));
 692
 693	mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 694
 695	/*
 696	 * We try to get the limits from the superuser's limits fields.
 697	 * This is quite hacky, but it is standard quota practice.
 698	 *
 699	 * We look at the USR dquot with id == 0 first, but if user quotas
 700	 * are not enabled we goto the GRP dquot with id == 0.
 701	 * We don't really care to keep separate default limits for user
 702	 * and group quotas, at least not at this point.
 703	 *
 704	 * Since we may not have done a quotacheck by this point, just read
 705	 * the dquot without attaching it to any hashtables or lists.
 706	 */
 707	error = xfs_qm_dqread(mp, 0,
 708			XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 709			 (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 710			  XFS_DQ_PROJ),
 711			XFS_QMOPT_DOWARN, &dqp);
 712	if (!error) {
 713		xfs_disk_dquot_t	*ddqp = &dqp->q_core;
 714
 715		/*
 716		 * The warnings and timers set the grace period given to
 717		 * a user or group before he or she can not perform any
 718		 * more writing. If it is zero, a default is used.
 719		 */
 720		qinf->qi_btimelimit = ddqp->d_btimer ?
 721			be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 722		qinf->qi_itimelimit = ddqp->d_itimer ?
 723			be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 724		qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 725			be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 726		qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 727			be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 728		qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 729			be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 730		qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 731			be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 732		qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 733		qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 734		qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 735		qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 736		qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 737		qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 738 
 739		xfs_qm_dqdestroy(dqp);
 740	} else {
 741		qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 742		qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 743		qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 744		qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 745		qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 746		qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 747	}
 748
 749	qinf->qi_shrinker.shrink = xfs_qm_shake;
 750	qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 751	register_shrinker(&qinf->qi_shrinker);
 752	return 0;
 753}
 754
 755
 756/*
 757 * Gets called when unmounting a filesystem or when all quotas get
 758 * turned off.
 759 * This purges the quota inodes, destroys locks and frees itself.
 760 */
 761void
 762xfs_qm_destroy_quotainfo(
 763	xfs_mount_t	*mp)
 764{
 765	xfs_quotainfo_t *qi;
 766
 767	qi = mp->m_quotainfo;
 768	ASSERT(qi != NULL);
 769
 770	unregister_shrinker(&qi->qi_shrinker);
 771
 772	if (qi->qi_uquotaip) {
 773		IRELE(qi->qi_uquotaip);
 774		qi->qi_uquotaip = NULL; /* paranoia */
 775	}
 776	if (qi->qi_gquotaip) {
 777		IRELE(qi->qi_gquotaip);
 778		qi->qi_gquotaip = NULL;
 779	}
 780	mutex_destroy(&qi->qi_quotaofflock);
 781	kmem_free(qi);
 782	mp->m_quotainfo = NULL;
 783}
 784
 785/*
 786 * Create an inode and return with a reference already taken, but unlocked
 787 * This is how we create quota inodes
 788 */
 789STATIC int
 790xfs_qm_qino_alloc(
 791	xfs_mount_t	*mp,
 792	xfs_inode_t	**ip,
 793	__int64_t	sbfields,
 794	uint		flags)
 795{
 796	xfs_trans_t	*tp;
 797	int		error;
 798	int		committed;
 799
 800	tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 801	if ((error = xfs_trans_reserve(tp,
 802				      XFS_QM_QINOCREATE_SPACE_RES(mp),
 803				      XFS_CREATE_LOG_RES(mp), 0,
 804				      XFS_TRANS_PERM_LOG_RES,
 805				      XFS_CREATE_LOG_COUNT))) {
 806		xfs_trans_cancel(tp, 0);
 807		return error;
 808	}
 809
 810	error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip, &committed);
 811	if (error) {
 812		xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 813				 XFS_TRANS_ABORT);
 814		return error;
 815	}
 816
 817	/*
 818	 * Make the changes in the superblock, and log those too.
 819	 * sbfields arg may contain fields other than *QUOTINO;
 820	 * VERSIONNUM for example.
 821	 */
 822	spin_lock(&mp->m_sb_lock);
 823	if (flags & XFS_QMOPT_SBVERSION) {
 824		ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 825		ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 826				   XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
 827		       (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 828			XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
 829
 830		xfs_sb_version_addquota(&mp->m_sb);
 831		mp->m_sb.sb_uquotino = NULLFSINO;
 832		mp->m_sb.sb_gquotino = NULLFSINO;
 833
 834		/* qflags will get updated _after_ quotacheck */
 835		mp->m_sb.sb_qflags = 0;
 836	}
 837	if (flags & XFS_QMOPT_UQUOTA)
 838		mp->m_sb.sb_uquotino = (*ip)->i_ino;
 839	else
 840		mp->m_sb.sb_gquotino = (*ip)->i_ino;
 841	spin_unlock(&mp->m_sb_lock);
 842	xfs_mod_sb(tp, sbfields);
 843
 844	if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
 845		xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 846		return error;
 847	}
 848	return 0;
 849}
 850
 851
 852STATIC void
 853xfs_qm_reset_dqcounts(
 854	xfs_mount_t	*mp,
 855	xfs_buf_t	*bp,
 856	xfs_dqid_t	id,
 857	uint		type)
 858{
 859	xfs_disk_dquot_t	*ddq;
 860	int			j;
 861
 862	trace_xfs_reset_dqcounts(bp, _RET_IP_);
 863
 864	/*
 865	 * Reset all counters and timers. They'll be
 866	 * started afresh by xfs_qm_quotacheck.
 867	 */
 868#ifdef DEBUG
 869	j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 870	do_div(j, sizeof(xfs_dqblk_t));
 871	ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 872#endif
 873	ddq = bp->b_addr;
 874	for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 875		/*
 876		 * Do a sanity check, and if needed, repair the dqblk. Don't
 877		 * output any warnings because it's perfectly possible to
 878		 * find uninitialised dquot blks. See comment in xfs_qm_dqcheck.
 879		 */
 880		(void) xfs_qm_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 881				      "xfs_quotacheck");
 882		ddq->d_bcount = 0;
 883		ddq->d_icount = 0;
 884		ddq->d_rtbcount = 0;
 885		ddq->d_btimer = 0;
 886		ddq->d_itimer = 0;
 887		ddq->d_rtbtimer = 0;
 888		ddq->d_bwarns = 0;
 889		ddq->d_iwarns = 0;
 890		ddq->d_rtbwarns = 0;
 891		ddq = (xfs_disk_dquot_t *) ((xfs_dqblk_t *)ddq + 1);
 892	}
 893}
 894
 895STATIC int
 896xfs_qm_dqiter_bufs(
 897	struct xfs_mount	*mp,
 898	xfs_dqid_t		firstid,
 899	xfs_fsblock_t		bno,
 900	xfs_filblks_t		blkcnt,
 901	uint			flags,
 902	struct list_head	*buffer_list)
 903{
 904	struct xfs_buf		*bp;
 905	int			error;
 906	int			type;
 907
 908	ASSERT(blkcnt > 0);
 909	type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 910		(flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 911	error = 0;
 912
 913	/*
 914	 * Blkcnt arg can be a very big number, and might even be
 915	 * larger than the log itself. So, we have to break it up into
 916	 * manageable-sized transactions.
 917	 * Note that we don't start a permanent transaction here; we might
 918	 * not be able to get a log reservation for the whole thing up front,
 919	 * and we don't really care to either, because we just discard
 920	 * everything if we were to crash in the middle of this loop.
 921	 */
 922	while (blkcnt--) {
 923		error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 924			      XFS_FSB_TO_DADDR(mp, bno),
 925			      mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 926			      &xfs_dquot_buf_ops);
 927		if (error)
 928			break;
 929
 930		xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 931		xfs_buf_delwri_queue(bp, buffer_list);
 932		xfs_buf_relse(bp);
 933		/*
 934		 * goto the next block.
 935		 */
 936		bno++;
 937		firstid += mp->m_quotainfo->qi_dqperchunk;
 938	}
 939
 940	return error;
 941}
 942
 943/*
 944 * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 945 * caller supplied function for every chunk of dquots that we find.
 946 */
 947STATIC int
 948xfs_qm_dqiterate(
 949	struct xfs_mount	*mp,
 950	struct xfs_inode	*qip,
 951	uint			flags,
 952	struct list_head	*buffer_list)
 953{
 954	struct xfs_bmbt_irec	*map;
 955	int			i, nmaps;	/* number of map entries */
 956	int			error;		/* return value */
 957	xfs_fileoff_t		lblkno;
 958	xfs_filblks_t		maxlblkcnt;
 959	xfs_dqid_t		firstid;
 960	xfs_fsblock_t		rablkno;
 961	xfs_filblks_t		rablkcnt;
 962
 963	error = 0;
 964	/*
 965	 * This looks racy, but we can't keep an inode lock across a
 966	 * trans_reserve. But, this gets called during quotacheck, and that
 967	 * happens only at mount time which is single threaded.
 968	 */
 969	if (qip->i_d.di_nblocks == 0)
 970		return 0;
 971
 972	map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 973
 974	lblkno = 0;
 975	maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 976	do {
 977		nmaps = XFS_DQITER_MAP_SIZE;
 978		/*
 979		 * We aren't changing the inode itself. Just changing
 980		 * some of its data. No new blocks are added here, and
 981		 * the inode is never added to the transaction.
 982		 */
 983		xfs_ilock(qip, XFS_ILOCK_SHARED);
 984		error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 985				       map, &nmaps, 0);
 986		xfs_iunlock(qip, XFS_ILOCK_SHARED);
 987		if (error)
 988			break;
 989
 990		ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
 991		for (i = 0; i < nmaps; i++) {
 992			ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
 993			ASSERT(map[i].br_blockcount);
 994
 995
 996			lblkno += map[i].br_blockcount;
 997
 998			if (map[i].br_startblock == HOLESTARTBLOCK)
 999				continue;
1000
1001			firstid = (xfs_dqid_t) map[i].br_startoff *
1002				mp->m_quotainfo->qi_dqperchunk;
1003			/*
1004			 * Do a read-ahead on the next extent.
1005			 */
1006			if ((i+1 < nmaps) &&
1007			    (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1008				rablkcnt =  map[i+1].br_blockcount;
1009				rablkno = map[i+1].br_startblock;
1010				while (rablkcnt--) {
1011					xfs_buf_readahead(mp->m_ddev_targp,
1012					       XFS_FSB_TO_DADDR(mp, rablkno),
1013					       mp->m_quotainfo->qi_dqchunklen,
1014					       NULL);
1015					rablkno++;
1016				}
1017			}
1018			/*
1019			 * Iterate thru all the blks in the extent and
1020			 * reset the counters of all the dquots inside them.
1021			 */
1022			error = xfs_qm_dqiter_bufs(mp, firstid,
1023						   map[i].br_startblock,
1024						   map[i].br_blockcount,
1025						   flags, buffer_list);
1026			if (error)
1027				goto out;
1028		}
1029	} while (nmaps > 0);
1030
1031out:
1032	kmem_free(map);
1033	return error;
1034}
1035
1036/*
1037 * Called by dqusage_adjust in doing a quotacheck.
1038 *
1039 * Given the inode, and a dquot id this updates both the incore dqout as well
1040 * as the buffer copy. This is so that once the quotacheck is done, we can
1041 * just log all the buffers, as opposed to logging numerous updates to
1042 * individual dquots.
1043 */
1044STATIC int
1045xfs_qm_quotacheck_dqadjust(
1046	struct xfs_inode	*ip,
1047	xfs_dqid_t		id,
1048	uint			type,
1049	xfs_qcnt_t		nblks,
1050	xfs_qcnt_t		rtblks)
1051{
1052	struct xfs_mount	*mp = ip->i_mount;
1053	struct xfs_dquot	*dqp;
1054	int			error;
1055
1056	error = xfs_qm_dqget(mp, ip, id, type,
1057			     XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1058	if (error) {
1059		/*
1060		 * Shouldn't be able to turn off quotas here.
1061		 */
1062		ASSERT(error != ESRCH);
1063		ASSERT(error != ENOENT);
1064		return error;
1065	}
1066
1067	trace_xfs_dqadjust(dqp);
1068
1069	/*
1070	 * Adjust the inode count and the block count to reflect this inode's
1071	 * resource usage.
1072	 */
1073	be64_add_cpu(&dqp->q_core.d_icount, 1);
1074	dqp->q_res_icount++;
1075	if (nblks) {
1076		be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1077		dqp->q_res_bcount += nblks;
1078	}
1079	if (rtblks) {
1080		be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1081		dqp->q_res_rtbcount += rtblks;
1082	}
1083
1084	/*
1085	 * Set default limits, adjust timers (since we changed usages)
1086	 *
1087	 * There are no timers for the default values set in the root dquot.
1088	 */
1089	if (dqp->q_core.d_id) {
1090		xfs_qm_adjust_dqlimits(mp, &dqp->q_core);
1091		xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1092	}
1093
1094	dqp->dq_flags |= XFS_DQ_DIRTY;
1095	xfs_qm_dqput(dqp);
1096	return 0;
1097}
1098
1099STATIC int
1100xfs_qm_get_rtblks(
1101	xfs_inode_t	*ip,
1102	xfs_qcnt_t	*O_rtblks)
1103{
1104	xfs_filblks_t	rtblks;			/* total rt blks */
1105	xfs_extnum_t	idx;			/* extent record index */
1106	xfs_ifork_t	*ifp;			/* inode fork pointer */
1107	xfs_extnum_t	nextents;		/* number of extent entries */
1108	int		error;
1109
1110	ASSERT(XFS_IS_REALTIME_INODE(ip));
1111	ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1112	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1113		if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1114			return error;
1115	}
1116	rtblks = 0;
1117	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1118	for (idx = 0; idx < nextents; idx++)
1119		rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1120	*O_rtblks = (xfs_qcnt_t)rtblks;
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, rtblks = 0;
1140	int		error;
1141
1142	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1143
1144	/*
1145	 * rootino must have its resources accounted for, not so with the quota
1146	 * inodes.
1147	 */
1148	if (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino) {
1149		*res = BULKSTAT_RV_NOTHING;
1150		return XFS_ERROR(EINVAL);
1151	}
1152
1153	/*
1154	 * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1155	 * interface expects the inode to be exclusively locked because that's
1156	 * the case in all other instances. It's OK that we do this because
1157	 * quotacheck is done only at mount time.
1158	 */
1159	error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1160	if (error) {
1161		*res = BULKSTAT_RV_NOTHING;
1162		return error;
1163	}
1164
1165	ASSERT(ip->i_delayed_blks == 0);
1166
1167	if (XFS_IS_REALTIME_INODE(ip)) {
1168		/*
1169		 * Walk thru the extent list and count the realtime blocks.
1170		 */
1171		error = xfs_qm_get_rtblks(ip, &rtblks);
1172		if (error)
1173			goto error0;
1174	}
1175
1176	nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1177
1178	/*
1179	 * Add the (disk blocks and inode) resources occupied by this
1180	 * inode to its dquots. We do this adjustment in the incore dquot,
1181	 * and also copy the changes to its buffer.
1182	 * We don't care about putting these changes in a transaction
1183	 * envelope because if we crash in the middle of a 'quotacheck'
1184	 * we have to start from the beginning anyway.
1185	 * Once we're done, we'll log all the dquot bufs.
1186	 *
1187	 * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1188	 * and quotaoffs don't race. (Quotachecks happen at mount time only).
1189	 */
1190	if (XFS_IS_UQUOTA_ON(mp)) {
1191		error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1192						   XFS_DQ_USER, nblks, rtblks);
1193		if (error)
1194			goto error0;
1195	}
1196
1197	if (XFS_IS_GQUOTA_ON(mp)) {
1198		error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1199						   XFS_DQ_GROUP, nblks, rtblks);
1200		if (error)
1201			goto error0;
1202	}
1203
1204	if (XFS_IS_PQUOTA_ON(mp)) {
1205		error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1206						   XFS_DQ_PROJ, nblks, rtblks);
1207		if (error)
1208			goto error0;
1209	}
1210
1211	xfs_iunlock(ip, XFS_ILOCK_EXCL);
1212	IRELE(ip);
1213	*res = BULKSTAT_RV_DIDONE;
1214	return 0;
1215
1216error0:
1217	xfs_iunlock(ip, XFS_ILOCK_EXCL);
1218	IRELE(ip);
1219	*res = BULKSTAT_RV_GIVEUP;
1220	return error;
1221}
1222
1223STATIC int
1224xfs_qm_flush_one(
1225	struct xfs_dquot	*dqp,
1226	void			*data)
1227{
1228	struct list_head	*buffer_list = data;
1229	struct xfs_buf		*bp = NULL;
1230	int			error = 0;
1231
1232	xfs_dqlock(dqp);
1233	if (dqp->dq_flags & XFS_DQ_FREEING)
1234		goto out_unlock;
1235	if (!XFS_DQ_IS_DIRTY(dqp))
1236		goto out_unlock;
1237
1238	xfs_dqflock(dqp);
1239	error = xfs_qm_dqflush(dqp, &bp);
1240	if (error)
1241		goto out_unlock;
1242
1243	xfs_buf_delwri_queue(bp, buffer_list);
1244	xfs_buf_relse(bp);
1245out_unlock:
1246	xfs_dqunlock(dqp);
1247	return error;
1248}
1249
1250/*
1251 * Walk thru all the filesystem inodes and construct a consistent view
1252 * of the disk quota world. If the quotacheck fails, disable quotas.
1253 */
1254int
1255xfs_qm_quotacheck(
1256	xfs_mount_t	*mp)
1257{
1258	int		done, count, error, error2;
1259	xfs_ino_t	lastino;
1260	size_t		structsz;
1261	xfs_inode_t	*uip, *gip;
1262	uint		flags;
1263	LIST_HEAD	(buffer_list);
1264
1265	count = INT_MAX;
1266	structsz = 1;
1267	lastino = 0;
1268	flags = 0;
1269
1270	ASSERT(mp->m_quotainfo->qi_uquotaip || mp->m_quotainfo->qi_gquotaip);
1271	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1272
1273	xfs_notice(mp, "Quotacheck needed: Please wait.");
1274
1275	/*
1276	 * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1277	 * their counters to zero. We need a clean slate.
1278	 * We don't log our changes till later.
1279	 */
1280	uip = mp->m_quotainfo->qi_uquotaip;
1281	if (uip) {
1282		error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1283					 &buffer_list);
1284		if (error)
1285			goto error_return;
1286		flags |= XFS_UQUOTA_CHKD;
1287	}
1288
1289	gip = mp->m_quotainfo->qi_gquotaip;
1290	if (gip) {
1291		error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
1292					 XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA,
1293					 &buffer_list);
1294		if (error)
1295			goto error_return;
1296		flags |= XFS_OQUOTA_CHKD;
1297	}
1298
1299	do {
1300		/*
1301		 * Iterate thru all the inodes in the file system,
1302		 * adjusting the corresponding dquot counters in core.
1303		 */
1304		error = xfs_bulkstat(mp, &lastino, &count,
1305				     xfs_qm_dqusage_adjust,
1306				     structsz, NULL, &done);
1307		if (error)
1308			break;
1309
1310	} while (!done);
1311
1312	/*
1313	 * We've made all the changes that we need to make incore.  Flush them
1314	 * down to disk buffers if everything was updated successfully.
1315	 */
1316	if (XFS_IS_UQUOTA_ON(mp)) {
1317		error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1318					  &buffer_list);
1319	}
1320	if (XFS_IS_GQUOTA_ON(mp)) {
1321		error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1322					   &buffer_list);
1323		if (!error)
1324			error = error2;
1325	}
1326	if (XFS_IS_PQUOTA_ON(mp)) {
1327		error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1328					   &buffer_list);
1329		if (!error)
1330			error = error2;
1331	}
1332
1333	error2 = xfs_buf_delwri_submit(&buffer_list);
1334	if (!error)
1335		error = error2;
1336
1337	/*
1338	 * We can get this error if we couldn't do a dquot allocation inside
1339	 * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1340	 * dirty dquots that might be cached, we just want to get rid of them
1341	 * and turn quotaoff. The dquots won't be attached to any of the inodes
1342	 * at this point (because we intentionally didn't in dqget_noattach).
1343	 */
1344	if (error) {
1345		xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1346		goto error_return;
1347	}
1348
1349	/*
1350	 * If one type of quotas is off, then it will lose its
1351	 * quotachecked status, since we won't be doing accounting for
1352	 * that type anymore.
1353	 */
1354	mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1355	mp->m_qflags |= flags;
1356
1357 error_return:
1358	while (!list_empty(&buffer_list)) {
1359		struct xfs_buf *bp =
1360			list_first_entry(&buffer_list, struct xfs_buf, b_list);
1361		list_del_init(&bp->b_list);
1362		xfs_buf_relse(bp);
1363	}
1364
1365	if (error) {
1366		xfs_warn(mp,
1367	"Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1368			error);
1369		/*
1370		 * We must turn off quotas.
1371		 */
1372		ASSERT(mp->m_quotainfo != NULL);
1373		xfs_qm_destroy_quotainfo(mp);
1374		if (xfs_mount_reset_sbqflags(mp)) {
1375			xfs_warn(mp,
1376				"Quotacheck: Failed to reset quota flags.");
1377		}
1378	} else
1379		xfs_notice(mp, "Quotacheck: Done.");
1380	return (error);
1381}
1382
1383/*
1384 * This is called after the superblock has been read in and we're ready to
1385 * iget the quota inodes.
1386 */
1387STATIC int
1388xfs_qm_init_quotainos(
1389	xfs_mount_t	*mp)
1390{
1391	xfs_inode_t	*uip, *gip;
1392	int		error;
1393	__int64_t	sbflags;
1394	uint		flags;
1395
1396	ASSERT(mp->m_quotainfo);
1397	uip = gip = NULL;
1398	sbflags = 0;
1399	flags = 0;
1400
1401	/*
1402	 * Get the uquota and gquota inodes
1403	 */
1404	if (xfs_sb_version_hasquota(&mp->m_sb)) {
1405		if (XFS_IS_UQUOTA_ON(mp) &&
1406		    mp->m_sb.sb_uquotino != NULLFSINO) {
1407			ASSERT(mp->m_sb.sb_uquotino > 0);
1408			if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1409					     0, 0, &uip)))
1410				return XFS_ERROR(error);
1411		}
1412		if (XFS_IS_OQUOTA_ON(mp) &&
1413		    mp->m_sb.sb_gquotino != NULLFSINO) {
1414			ASSERT(mp->m_sb.sb_gquotino > 0);
1415			if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1416					     0, 0, &gip))) {
1417				if (uip)
1418					IRELE(uip);
1419				return XFS_ERROR(error);
1420			}
1421		}
1422	} else {
1423		flags |= XFS_QMOPT_SBVERSION;
1424		sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1425			    XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
1426	}
1427
1428	/*
1429	 * Create the two inodes, if they don't exist already. The changes
1430	 * made above will get added to a transaction and logged in one of
1431	 * the qino_alloc calls below.  If the device is readonly,
1432	 * temporarily switch to read-write to do this.
1433	 */
1434	if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1435		if ((error = xfs_qm_qino_alloc(mp, &uip,
1436					      sbflags | XFS_SB_UQUOTINO,
1437					      flags | XFS_QMOPT_UQUOTA)))
1438			return XFS_ERROR(error);
1439
1440		flags &= ~XFS_QMOPT_SBVERSION;
1441	}
1442	if (XFS_IS_OQUOTA_ON(mp) && gip == NULL) {
1443		flags |= (XFS_IS_GQUOTA_ON(mp) ?
1444				XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
1445		error = xfs_qm_qino_alloc(mp, &gip,
1446					  sbflags | XFS_SB_GQUOTINO, flags);
1447		if (error) {
1448			if (uip)
1449				IRELE(uip);
1450
1451			return XFS_ERROR(error);
1452		}
1453	}
1454
1455	mp->m_quotainfo->qi_uquotaip = uip;
1456	mp->m_quotainfo->qi_gquotaip = gip;
1457
1458	return 0;
1459}
1460
1461STATIC void
1462xfs_qm_dqfree_one(
1463	struct xfs_dquot	*dqp)
1464{
1465	struct xfs_mount	*mp = dqp->q_mount;
1466	struct xfs_quotainfo	*qi = mp->m_quotainfo;
1467
1468	mutex_lock(&qi->qi_tree_lock);
1469	radix_tree_delete(XFS_DQUOT_TREE(qi, dqp->q_core.d_flags),
1470			  be32_to_cpu(dqp->q_core.d_id));
1471
1472	qi->qi_dquots--;
1473	mutex_unlock(&qi->qi_tree_lock);
1474
1475	xfs_qm_dqdestroy(dqp);
1476}
1477
1478STATIC void
1479xfs_qm_dqreclaim_one(
1480	struct xfs_dquot	*dqp,
1481	struct list_head	*buffer_list,
1482	struct list_head	*dispose_list)
1483{
1484	struct xfs_mount	*mp = dqp->q_mount;
1485	struct xfs_quotainfo	*qi = mp->m_quotainfo;
1486	int			error;
1487
1488	if (!xfs_dqlock_nowait(dqp))
1489		goto out_move_tail;
1490
1491	/*
1492	 * This dquot has acquired a reference in the meantime remove it from
1493	 * the freelist and try again.
1494	 */
1495	if (dqp->q_nrefs) {
1496		xfs_dqunlock(dqp);
1497
1498		trace_xfs_dqreclaim_want(dqp);
1499		XFS_STATS_INC(xs_qm_dqwants);
1500
1501		list_del_init(&dqp->q_lru);
1502		qi->qi_lru_count--;
1503		XFS_STATS_DEC(xs_qm_dquot_unused);
1504		return;
1505	}
1506
1507	/*
1508	 * Try to grab the flush lock. If this dquot is in the process of
1509	 * getting flushed to disk, we don't want to reclaim it.
1510	 */
1511	if (!xfs_dqflock_nowait(dqp))
1512		goto out_unlock_move_tail;
1513
1514	if (XFS_DQ_IS_DIRTY(dqp)) {
1515		struct xfs_buf	*bp = NULL;
1516
1517		trace_xfs_dqreclaim_dirty(dqp);
1518
1519		error = xfs_qm_dqflush(dqp, &bp);
1520		if (error) {
1521			xfs_warn(mp, "%s: dquot %p flush failed",
1522				 __func__, dqp);
1523			goto out_unlock_move_tail;
1524		}
1525
1526		xfs_buf_delwri_queue(bp, buffer_list);
1527		xfs_buf_relse(bp);
1528		/*
1529		 * Give the dquot another try on the freelist, as the
1530		 * flushing will take some time.
1531		 */
1532		goto out_unlock_move_tail;
1533	}
1534	xfs_dqfunlock(dqp);
1535
1536	/*
1537	 * Prevent lookups now that we are past the point of no return.
1538	 */
1539	dqp->dq_flags |= XFS_DQ_FREEING;
1540	xfs_dqunlock(dqp);
1541
1542	ASSERT(dqp->q_nrefs == 0);
1543	list_move_tail(&dqp->q_lru, dispose_list);
1544	qi->qi_lru_count--;
1545	XFS_STATS_DEC(xs_qm_dquot_unused);
1546
1547	trace_xfs_dqreclaim_done(dqp);
1548	XFS_STATS_INC(xs_qm_dqreclaims);
1549	return;
1550
1551	/*
1552	 * Move the dquot to the tail of the list so that we don't spin on it.
1553	 */
1554out_unlock_move_tail:
1555	xfs_dqunlock(dqp);
1556out_move_tail:
1557	list_move_tail(&dqp->q_lru, &qi->qi_lru_list);
1558	trace_xfs_dqreclaim_busy(dqp);
1559	XFS_STATS_INC(xs_qm_dqreclaim_misses);
1560}
1561
1562STATIC int
1563xfs_qm_shake(
1564	struct shrinker		*shrink,
1565	struct shrink_control	*sc)
1566{
1567	struct xfs_quotainfo	*qi =
1568		container_of(shrink, struct xfs_quotainfo, qi_shrinker);
1569	int			nr_to_scan = sc->nr_to_scan;
1570	LIST_HEAD		(buffer_list);
1571	LIST_HEAD		(dispose_list);
1572	struct xfs_dquot	*dqp;
1573	int			error;
1574
1575	if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
1576		return 0;
1577	if (!nr_to_scan)
1578		goto out;
1579
1580	mutex_lock(&qi->qi_lru_lock);
1581	while (!list_empty(&qi->qi_lru_list)) {
1582		if (nr_to_scan-- <= 0)
1583			break;
1584		dqp = list_first_entry(&qi->qi_lru_list, struct xfs_dquot,
1585				       q_lru);
1586		xfs_qm_dqreclaim_one(dqp, &buffer_list, &dispose_list);
1587	}
1588	mutex_unlock(&qi->qi_lru_lock);
1589
1590	error = xfs_buf_delwri_submit(&buffer_list);
1591	if (error)
1592		xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
1593
1594	while (!list_empty(&dispose_list)) {
1595		dqp = list_first_entry(&dispose_list, struct xfs_dquot, q_lru);
1596		list_del_init(&dqp->q_lru);
1597		xfs_qm_dqfree_one(dqp);
1598	}
1599
1600out:
1601	return (qi->qi_lru_count / 100) * sysctl_vfs_cache_pressure;
1602}
1603
1604/*
1605 * Start a transaction and write the incore superblock changes to
1606 * disk. flags parameter indicates which fields have changed.
1607 */
1608int
1609xfs_qm_write_sb_changes(
1610	xfs_mount_t	*mp,
1611	__int64_t	flags)
1612{
1613	xfs_trans_t	*tp;
1614	int		error;
1615
1616	tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
1617	if ((error = xfs_trans_reserve(tp, 0,
1618				      mp->m_sb.sb_sectsize + 128, 0,
1619				      0,
1620				      XFS_DEFAULT_LOG_COUNT))) {
1621		xfs_trans_cancel(tp, 0);
1622		return error;
1623	}
1624
1625	xfs_mod_sb(tp, flags);
1626	error = xfs_trans_commit(tp, 0);
1627
1628	return error;
1629}
1630
1631
1632/* --------------- utility functions for vnodeops ---------------- */
1633
1634
1635/*
1636 * Given an inode, a uid, gid and prid make sure that we have
1637 * allocated relevant dquot(s) on disk, and that we won't exceed inode
1638 * quotas by creating this file.
1639 * This also attaches dquot(s) to the given inode after locking it,
1640 * and returns the dquots corresponding to the uid and/or gid.
1641 *
1642 * in	: inode (unlocked)
1643 * out	: udquot, gdquot with references taken and unlocked
1644 */
1645int
1646xfs_qm_vop_dqalloc(
1647	struct xfs_inode	*ip,
1648	uid_t			uid,
1649	gid_t			gid,
1650	prid_t			prid,
1651	uint			flags,
1652	struct xfs_dquot	**O_udqpp,
1653	struct xfs_dquot	**O_gdqpp)
1654{
1655	struct xfs_mount	*mp = ip->i_mount;
1656	struct xfs_dquot	*uq, *gq;
1657	int			error;
1658	uint			lockflags;
1659
1660	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1661		return 0;
1662
1663	lockflags = XFS_ILOCK_EXCL;
1664	xfs_ilock(ip, lockflags);
1665
1666	if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1667		gid = ip->i_d.di_gid;
1668
1669	/*
1670	 * Attach the dquot(s) to this inode, doing a dquot allocation
1671	 * if necessary. The dquot(s) will not be locked.
1672	 */
1673	if (XFS_NOT_DQATTACHED(mp, ip)) {
1674		error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1675		if (error) {
1676			xfs_iunlock(ip, lockflags);
1677			return error;
1678		}
1679	}
1680
1681	uq = gq = NULL;
1682	if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1683		if (ip->i_d.di_uid != uid) {
1684			/*
1685			 * What we need is the dquot that has this uid, and
1686			 * if we send the inode to dqget, the uid of the inode
1687			 * takes priority over what's sent in the uid argument.
1688			 * We must unlock inode here before calling dqget if
1689			 * we're not sending the inode, because otherwise
1690			 * we'll deadlock by doing trans_reserve while
1691			 * holding ilock.
1692			 */
1693			xfs_iunlock(ip, lockflags);
1694			if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
1695						 XFS_DQ_USER,
1696						 XFS_QMOPT_DQALLOC |
1697						 XFS_QMOPT_DOWARN,
1698						 &uq))) {
1699				ASSERT(error != ENOENT);
1700				return error;
1701			}
1702			/*
1703			 * Get the ilock in the right order.
1704			 */
1705			xfs_dqunlock(uq);
1706			lockflags = XFS_ILOCK_SHARED;
1707			xfs_ilock(ip, lockflags);
1708		} else {
1709			/*
1710			 * Take an extra reference, because we'll return
1711			 * this to caller
1712			 */
1713			ASSERT(ip->i_udquot);
1714			uq = xfs_qm_dqhold(ip->i_udquot);
1715		}
1716	}
1717	if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1718		if (ip->i_d.di_gid != gid) {
1719			xfs_iunlock(ip, lockflags);
1720			if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)gid,
1721						 XFS_DQ_GROUP,
1722						 XFS_QMOPT_DQALLOC |
1723						 XFS_QMOPT_DOWARN,
1724						 &gq))) {
1725				if (uq)
1726					xfs_qm_dqrele(uq);
1727				ASSERT(error != ENOENT);
1728				return error;
1729			}
1730			xfs_dqunlock(gq);
1731			lockflags = XFS_ILOCK_SHARED;
1732			xfs_ilock(ip, lockflags);
1733		} else {
1734			ASSERT(ip->i_gdquot);
1735			gq = xfs_qm_dqhold(ip->i_gdquot);
1736		}
1737	} else if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1738		if (xfs_get_projid(ip) != prid) {
1739			xfs_iunlock(ip, lockflags);
1740			if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1741						 XFS_DQ_PROJ,
1742						 XFS_QMOPT_DQALLOC |
1743						 XFS_QMOPT_DOWARN,
1744						 &gq))) {
1745				if (uq)
1746					xfs_qm_dqrele(uq);
1747				ASSERT(error != ENOENT);
1748				return (error);
1749			}
1750			xfs_dqunlock(gq);
1751			lockflags = XFS_ILOCK_SHARED;
1752			xfs_ilock(ip, lockflags);
1753		} else {
1754			ASSERT(ip->i_gdquot);
1755			gq = xfs_qm_dqhold(ip->i_gdquot);
1756		}
1757	}
1758	if (uq)
1759		trace_xfs_dquot_dqalloc(ip);
1760
1761	xfs_iunlock(ip, lockflags);
1762	if (O_udqpp)
1763		*O_udqpp = uq;
1764	else if (uq)
1765		xfs_qm_dqrele(uq);
1766	if (O_gdqpp)
1767		*O_gdqpp = gq;
1768	else if (gq)
1769		xfs_qm_dqrele(gq);
1770	return 0;
1771}
1772
1773/*
1774 * Actually transfer ownership, and do dquot modifications.
1775 * These were already reserved.
1776 */
1777xfs_dquot_t *
1778xfs_qm_vop_chown(
1779	xfs_trans_t	*tp,
1780	xfs_inode_t	*ip,
1781	xfs_dquot_t	**IO_olddq,
1782	xfs_dquot_t	*newdq)
1783{
1784	xfs_dquot_t	*prevdq;
1785	uint		bfield = XFS_IS_REALTIME_INODE(ip) ?
1786				 XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1787
1788
1789	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1790	ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1791
1792	/* old dquot */
1793	prevdq = *IO_olddq;
1794	ASSERT(prevdq);
1795	ASSERT(prevdq != newdq);
1796
1797	xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1798	xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1799
1800	/* the sparkling new dquot */
1801	xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1802	xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1803
1804	/*
1805	 * Take an extra reference, because the inode is going to keep
1806	 * this dquot pointer even after the trans_commit.
1807	 */
1808	*IO_olddq = xfs_qm_dqhold(newdq);
1809
1810	return prevdq;
1811}
1812
1813/*
1814 * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1815 */
1816int
1817xfs_qm_vop_chown_reserve(
1818	xfs_trans_t	*tp,
1819	xfs_inode_t	*ip,
1820	xfs_dquot_t	*udqp,
1821	xfs_dquot_t	*gdqp,
1822	uint		flags)
1823{
1824	xfs_mount_t	*mp = ip->i_mount;
1825	uint		delblks, blkflags, prjflags = 0;
1826	xfs_dquot_t	*unresudq, *unresgdq, *delblksudq, *delblksgdq;
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	delblksudq = delblksgdq = unresudq = unresgdq = NULL;
1835	blkflags = XFS_IS_REALTIME_INODE(ip) ?
1836			XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1837
1838	if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1839	    ip->i_d.di_uid != (uid_t)be32_to_cpu(udqp->q_core.d_id)) {
1840		delblksudq = udqp;
1841		/*
1842		 * If there are delayed allocation blocks, then we have to
1843		 * unreserve those from the old dquot, and add them to the
1844		 * new dquot.
1845		 */
1846		if (delblks) {
1847			ASSERT(ip->i_udquot);
1848			unresudq = ip->i_udquot;
1849		}
1850	}
1851	if (XFS_IS_OQUOTA_ON(ip->i_mount) && gdqp) {
1852		if (XFS_IS_PQUOTA_ON(ip->i_mount) &&
1853		     xfs_get_projid(ip) != be32_to_cpu(gdqp->q_core.d_id))
1854			prjflags = XFS_QMOPT_ENOSPC;
1855
1856		if (prjflags ||
1857		    (XFS_IS_GQUOTA_ON(ip->i_mount) &&
1858		     ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id))) {
1859			delblksgdq = gdqp;
1860			if (delblks) {
1861				ASSERT(ip->i_gdquot);
1862				unresgdq = ip->i_gdquot;
1863			}
1864		}
1865	}
1866
1867	if ((error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1868				delblksudq, delblksgdq, ip->i_d.di_nblocks, 1,
1869				flags | blkflags | prjflags)))
1870		return (error);
1871
1872	/*
1873	 * Do the delayed blks reservations/unreservations now. Since, these
1874	 * are done without the help of a transaction, if a reservation fails
1875	 * its previous reservations won't be automatically undone by trans
1876	 * code. So, we have to do it manually here.
1877	 */
1878	if (delblks) {
1879		/*
1880		 * Do the reservations first. Unreservation can't fail.
1881		 */
1882		ASSERT(delblksudq || delblksgdq);
1883		ASSERT(unresudq || unresgdq);
1884		if ((error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1885				delblksudq, delblksgdq, (xfs_qcnt_t)delblks, 0,
1886				flags | blkflags | prjflags)))
1887			return (error);
1888		xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1889				unresudq, unresgdq, -((xfs_qcnt_t)delblks), 0,
1890				blkflags);
1891	}
1892
1893	return (0);
1894}
1895
1896int
1897xfs_qm_vop_rename_dqattach(
1898	struct xfs_inode	**i_tab)
1899{
1900	struct xfs_mount	*mp = i_tab[0]->i_mount;
1901	int			i;
1902
1903	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1904		return 0;
1905
1906	for (i = 0; (i < 4 && i_tab[i]); i++) {
1907		struct xfs_inode	*ip = i_tab[i];
1908		int			error;
1909
1910		/*
1911		 * Watch out for duplicate entries in the table.
1912		 */
1913		if (i == 0 || ip != i_tab[i-1]) {
1914			if (XFS_NOT_DQATTACHED(mp, ip)) {
1915				error = xfs_qm_dqattach(ip, 0);
1916				if (error)
1917					return error;
1918			}
1919		}
1920	}
1921	return 0;
1922}
1923
1924void
1925xfs_qm_vop_create_dqattach(
1926	struct xfs_trans	*tp,
1927	struct xfs_inode	*ip,
1928	struct xfs_dquot	*udqp,
1929	struct xfs_dquot	*gdqp)
1930{
1931	struct xfs_mount	*mp = tp->t_mountp;
1932
1933	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1934		return;
1935
1936	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1937	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1938
1939	if (udqp) {
1940		ASSERT(ip->i_udquot == NULL);
1941		ASSERT(XFS_IS_UQUOTA_ON(mp));
1942		ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1943
1944		ip->i_udquot = xfs_qm_dqhold(udqp);
1945		xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1946	}
1947	if (gdqp) {
1948		ASSERT(ip->i_gdquot == NULL);
1949		ASSERT(XFS_IS_OQUOTA_ON(mp));
1950		ASSERT((XFS_IS_GQUOTA_ON(mp) ?
1951			ip->i_d.di_gid : xfs_get_projid(ip)) ==
1952				be32_to_cpu(gdqp->q_core.d_id));
1953
1954		ip->i_gdquot = xfs_qm_dqhold(gdqp);
1955		xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1956	}
1957}
1958