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
  44/*
  45 * The global quota manager. There is only one of these for the entire
  46 * system, _not_ one per file system. XQM keeps track of the overall
  47 * quota functionality, including maintaining the freelist and hash
  48 * tables of dquots.
  49 */
  50STATIC int	xfs_qm_init_quotainos(xfs_mount_t *);
  51STATIC int	xfs_qm_init_quotainfo(xfs_mount_t *);
  52STATIC int	xfs_qm_shake(struct shrinker *, struct shrink_control *);
  53
 
  54/*
  55 * We use the batch lookup interface to iterate over the dquots as it
  56 * currently is the only interface into the radix tree code that allows
  57 * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  58 * operations is fine as all callers are used either during mount/umount
  59 * or quotaoff.
  60 */
  61#define XFS_DQ_LOOKUP_BATCH	32
  62
  63STATIC int
  64xfs_qm_dquot_walk(
  65	struct xfs_mount	*mp,
  66	int			type,
  67	int			(*execute)(struct xfs_dquot *dqp, void *data),
  68	void			*data)
  69{
  70	struct xfs_quotainfo	*qi = mp->m_quotainfo;
  71	struct radix_tree_root	*tree = XFS_DQUOT_TREE(qi, type);
  72	uint32_t		next_index;
  73	int			last_error = 0;
  74	int			skipped;
  75	int			nr_found;
  76
  77restart:
  78	skipped = 0;
  79	next_index = 0;
  80	nr_found = 0;
  81
  82	while (1) {
  83		struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  84		int		error = 0;
  85		int		i;
  86
  87		mutex_lock(&qi->qi_tree_lock);
  88		nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  89					next_index, XFS_DQ_LOOKUP_BATCH);
  90		if (!nr_found) {
  91			mutex_unlock(&qi->qi_tree_lock);
  92			break;
  93		}
  94
  95		for (i = 0; i < nr_found; i++) {
  96			struct xfs_dquot *dqp = batch[i];
  97
  98			next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
  99
 100			error = execute(batch[i], data);
 101			if (error == EAGAIN) {
 102				skipped++;
 103				continue;
 104			}
 105			if (error && last_error != EFSCORRUPTED)
 106				last_error = error;
 107		}
 108
 109		mutex_unlock(&qi->qi_tree_lock);
 110
 111		/* bail out if the filesystem is corrupted.  */
 112		if (last_error == EFSCORRUPTED) {
 113			skipped = 0;
 114			break;
 115		}
 
 
 
 116	}
 117
 118	if (skipped) {
 119		delay(1);
 120		goto restart;
 121	}
 122
 123	return last_error;
 124}
 125
 126
 127/*
 128 * Purge a dquot from all tracking data structures and free it.
 129 */
 130STATIC int
 131xfs_qm_dqpurge(
 132	struct xfs_dquot	*dqp,
 133	void			*data)
 134{
 135	struct xfs_mount	*mp = dqp->q_mount;
 136	struct xfs_quotainfo	*qi = mp->m_quotainfo;
 137	struct xfs_dquot	*gdqp = NULL;
 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	/*
 146	 * If this quota has a group hint attached, prepare for releasing it
 147	 * now.
 148	 */
 149	gdqp = dqp->q_gdquot;
 150	if (gdqp) {
 151		xfs_dqlock(gdqp);
 152		dqp->q_gdquot = NULL;
 153	}
 154
 155	dqp->dq_flags |= XFS_DQ_FREEING;
 156
 157	xfs_dqflock(dqp);
 158
 159	/*
 160	 * If we are turning this type of quotas off, we don't care
 161	 * about the dirty metadata sitting in this dquot. OTOH, if
 162	 * we're unmounting, we do care, so we flush it and wait.
 163	 */
 164	if (XFS_DQ_IS_DIRTY(dqp)) {
 165		struct xfs_buf	*bp = NULL;
 166		int		error;
 167
 168		/*
 169		 * We don't care about getting disk errors here. We need
 170		 * to purge this dquot anyway, so we go ahead regardless.
 171		 */
 172		error = xfs_qm_dqflush(dqp, &bp);
 173		if (error) {
 174			xfs_warn(mp, "%s: dquot %p flush failed",
 175				__func__, dqp);
 176		} else {
 
 
 
 
 
 
 
 
 
 
 177			error = xfs_bwrite(bp);
 178			xfs_buf_relse(bp);
 179		}
 180		xfs_dqflock(dqp);
 181	}
 
 182
 
 183	ASSERT(atomic_read(&dqp->q_pincount) == 0);
 184	ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 185	       !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 186
 187	xfs_dqfunlock(dqp);
 188	xfs_dqunlock(dqp);
 189
 190	radix_tree_delete(XFS_DQUOT_TREE(qi, dqp->q_core.d_flags),
 191			  be32_to_cpu(dqp->q_core.d_id));
 192	qi->qi_dquots--;
 193
 194	/*
 195	 * We move dquots to the freelist as soon as their reference count
 196	 * hits zero, so it really should be on the freelist here.
 197	 */
 198	mutex_lock(&qi->qi_lru_lock);
 199	ASSERT(!list_empty(&dqp->q_lru));
 200	list_del_init(&dqp->q_lru);
 201	qi->qi_lru_count--;
 202	XFS_STATS_DEC(xs_qm_dquot_unused);
 203	mutex_unlock(&qi->qi_lru_lock);
 204
 205	xfs_qm_dqdestroy(dqp);
 206
 207	if (gdqp)
 208		xfs_qm_dqput(gdqp);
 209	return 0;
 
 
 
 
 210}
 211
 212/*
 213 * Purge the dquot cache.
 214 */
 215void
 216xfs_qm_dqpurge_all(
 217	struct xfs_mount	*mp,
 218	uint			flags)
 219{
 220	if (flags & XFS_QMOPT_UQUOTA)
 221		xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 222	if (flags & XFS_QMOPT_GQUOTA)
 223		xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 224	if (flags & XFS_QMOPT_PQUOTA)
 225		xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 226}
 227
 228/*
 229 * Just destroy the quotainfo structure.
 230 */
 231void
 232xfs_qm_unmount(
 233	struct xfs_mount	*mp)
 234{
 235	if (mp->m_quotainfo) {
 236		xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 237		xfs_qm_destroy_quotainfo(mp);
 238	}
 239}
 240
 241
 242/*
 243 * This is called from xfs_mountfs to start quotas and initialize all
 244 * necessary data structures like quotainfo.  This is also responsible for
 245 * running a quotacheck as necessary.  We are guaranteed that the superblock
 246 * is consistently read in at this point.
 247 *
 248 * If we fail here, the mount will continue with quota turned off. We don't
 249 * need to inidicate success or failure at all.
 250 */
 251void
 252xfs_qm_mount_quotas(
 253	xfs_mount_t	*mp)
 254{
 255	int		error = 0;
 256	uint		sbf;
 257
 258	/*
 259	 * If quotas on realtime volumes is not supported, we disable
 260	 * quotas immediately.
 261	 */
 262	if (mp->m_sb.sb_rextents) {
 263		xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
 264		mp->m_qflags = 0;
 265		goto write_changes;
 266	}
 267
 268	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 269
 270	/*
 271	 * Allocate the quotainfo structure inside the mount struct, and
 272	 * create quotainode(s), and change/rev superblock if necessary.
 273	 */
 274	error = xfs_qm_init_quotainfo(mp);
 275	if (error) {
 276		/*
 277		 * We must turn off quotas.
 278		 */
 279		ASSERT(mp->m_quotainfo == NULL);
 280		mp->m_qflags = 0;
 281		goto write_changes;
 282	}
 283	/*
 284	 * If any of the quotas are not consistent, do a quotacheck.
 285	 */
 286	if (XFS_QM_NEED_QUOTACHECK(mp)) {
 287		error = xfs_qm_quotacheck(mp);
 288		if (error) {
 289			/* Quotacheck failed and disabled quotas. */
 290			return;
 291		}
 292	}
 293	/* 
 294	 * If one type of quotas is off, then it will lose its
 295	 * quotachecked status, since we won't be doing accounting for
 296	 * that type anymore.
 297	 */
 298	if (!XFS_IS_UQUOTA_ON(mp))
 299		mp->m_qflags &= ~XFS_UQUOTA_CHKD;
 300	if (!(XFS_IS_GQUOTA_ON(mp) || XFS_IS_PQUOTA_ON(mp)))
 301		mp->m_qflags &= ~XFS_OQUOTA_CHKD;
 302
 303 write_changes:
 304	/*
 305	 * We actually don't have to acquire the m_sb_lock at all.
 306	 * This can only be called from mount, and that's single threaded. XXX
 307	 */
 308	spin_lock(&mp->m_sb_lock);
 309	sbf = mp->m_sb.sb_qflags;
 310	mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
 311	spin_unlock(&mp->m_sb_lock);
 312
 313	if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
 314		if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
 315			/*
 316			 * We could only have been turning quotas off.
 317			 * We aren't in very good shape actually because
 318			 * the incore structures are convinced that quotas are
 319			 * off, but the on disk superblock doesn't know that !
 320			 */
 321			ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
 322			xfs_alert(mp, "%s: Superblock update failed!",
 323				__func__);
 324		}
 325	}
 326
 327	if (error) {
 328		xfs_warn(mp, "Failed to initialize disk quotas.");
 329		return;
 
 
 
 330	}
 331}
 332
 333/*
 334 * Called from the vfsops layer.
 335 */
 336void
 337xfs_qm_unmount_quotas(
 338	xfs_mount_t	*mp)
 339{
 340	/*
 341	 * Release the dquots that root inode, et al might be holding,
 342	 * before we flush quotas and blow away the quotainfo structure.
 343	 */
 344	ASSERT(mp->m_rootip);
 345	xfs_qm_dqdetach(mp->m_rootip);
 346	if (mp->m_rbmip)
 347		xfs_qm_dqdetach(mp->m_rbmip);
 348	if (mp->m_rsumip)
 349		xfs_qm_dqdetach(mp->m_rsumip);
 
 
 
 350
 351	/*
 352	 * Release the quota inodes.
 353	 */
 354	if (mp->m_quotainfo) {
 355		if (mp->m_quotainfo->qi_uquotaip) {
 356			IRELE(mp->m_quotainfo->qi_uquotaip);
 357			mp->m_quotainfo->qi_uquotaip = NULL;
 358		}
 359		if (mp->m_quotainfo->qi_gquotaip) {
 360			IRELE(mp->m_quotainfo->qi_gquotaip);
 361			mp->m_quotainfo->qi_gquotaip = NULL;
 362		}
 363	}
 364}
 365
 366STATIC int
 367xfs_qm_dqattach_one(
 368	xfs_inode_t	*ip,
 369	xfs_dqid_t	id,
 370	uint		type,
 371	uint		doalloc,
 372	xfs_dquot_t	*udqhint, /* hint */
 373	xfs_dquot_t	**IO_idqpp)
 374{
 375	xfs_dquot_t	*dqp;
 376	int		error;
 377
 378	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 379	error = 0;
 380
 381	/*
 382	 * See if we already have it in the inode itself. IO_idqpp is
 383	 * &i_udquot or &i_gdquot. This made the code look weird, but
 384	 * made the logic a lot simpler.
 385	 */
 386	dqp = *IO_idqpp;
 387	if (dqp) {
 388		trace_xfs_dqattach_found(dqp);
 389		return 0;
 390	}
 391
 392	/*
 393	 * udqhint is the i_udquot field in inode, and is non-NULL only
 394	 * when the type arg is group/project. Its purpose is to save a
 395	 * lookup by dqid (xfs_qm_dqget) by caching a group dquot inside
 396	 * the user dquot.
 397	 */
 398	if (udqhint) {
 399		ASSERT(type == XFS_DQ_GROUP || type == XFS_DQ_PROJ);
 400		xfs_dqlock(udqhint);
 401
 402		/*
 403		 * No need to take dqlock to look at the id.
 404		 *
 405		 * The ID can't change until it gets reclaimed, and it won't
 406		 * be reclaimed as long as we have a ref from inode and we
 407		 * hold the ilock.
 408		 */
 409		dqp = udqhint->q_gdquot;
 410		if (dqp && be32_to_cpu(dqp->q_core.d_id) == id) {
 411			ASSERT(*IO_idqpp == NULL);
 412
 413			*IO_idqpp = xfs_qm_dqhold(dqp);
 414			xfs_dqunlock(udqhint);
 415			return 0;
 416		}
 417
 418		/*
 419		 * We can't hold a dquot lock when we call the dqget code.
 420		 * We'll deadlock in no time, because of (not conforming to)
 421		 * lock ordering - the inodelock comes before any dquot lock,
 422		 * and we may drop and reacquire the ilock in xfs_qm_dqget().
 423		 */
 424		xfs_dqunlock(udqhint);
 425	}
 426
 427	/*
 428	 * Find the dquot from somewhere. This bumps the
 429	 * reference count of dquot and returns it locked.
 430	 * This can return ENOENT if dquot didn't exist on
 431	 * disk and we didn't ask it to allocate;
 432	 * ESRCH if quotas got turned off suddenly.
 433	 */
 434	error = xfs_qm_dqget(ip->i_mount, ip, id, type,
 435			     doalloc | XFS_QMOPT_DOWARN, &dqp);
 436	if (error)
 437		return error;
 438
 439	trace_xfs_dqattach_get(dqp);
 440
 441	/*
 442	 * dqget may have dropped and re-acquired the ilock, but it guarantees
 443	 * that the dquot returned is the one that should go in the inode.
 444	 */
 445	*IO_idqpp = dqp;
 446	xfs_dqunlock(dqp);
 447	return 0;
 448}
 449
 450
 451/*
 452 * Given a udquot and gdquot, attach a ptr to the group dquot in the
 453 * udquot as a hint for future lookups.
 454 */
 455STATIC void
 456xfs_qm_dqattach_grouphint(
 457	xfs_dquot_t	*udq,
 458	xfs_dquot_t	*gdq)
 459{
 460	xfs_dquot_t	*tmp;
 461
 462	xfs_dqlock(udq);
 463
 464	tmp = udq->q_gdquot;
 465	if (tmp) {
 466		if (tmp == gdq)
 467			goto done;
 468
 469		udq->q_gdquot = NULL;
 470		xfs_qm_dqrele(tmp);
 471	}
 472
 473	udq->q_gdquot = xfs_qm_dqhold(gdq);
 474done:
 475	xfs_dqunlock(udq);
 476}
 477
 478static bool
 479xfs_qm_need_dqattach(
 480	struct xfs_inode	*ip)
 481{
 482	struct xfs_mount	*mp = ip->i_mount;
 483
 484	if (!XFS_IS_QUOTA_RUNNING(mp))
 485		return false;
 486	if (!XFS_IS_QUOTA_ON(mp))
 487		return false;
 488	if (!XFS_NOT_DQATTACHED(mp, ip))
 489		return false;
 490	if (ip->i_ino == mp->m_sb.sb_uquotino ||
 491	    ip->i_ino == mp->m_sb.sb_gquotino)
 
 492		return false;
 493	return true;
 494}
 495
 496/*
 497 * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 498 * into account.
 499 * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 500 * Inode may get unlocked and relocked in here, and the caller must deal with
 501 * the consequences.
 502 */
 503int
 504xfs_qm_dqattach_locked(
 505	xfs_inode_t	*ip,
 506	uint		flags)
 507{
 508	xfs_mount_t	*mp = ip->i_mount;
 509	uint		nquotas = 0;
 510	int		error = 0;
 511
 512	if (!xfs_qm_need_dqattach(ip))
 513		return 0;
 514
 515	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 
 516
 517	if (XFS_IS_UQUOTA_ON(mp)) {
 518		error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 519						flags & XFS_QMOPT_DQALLOC,
 520						NULL, &ip->i_udquot);
 521		if (error)
 522			goto done;
 523		nquotas++;
 524	}
 525
 526	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 527	if (XFS_IS_OQUOTA_ON(mp)) {
 528		error = XFS_IS_GQUOTA_ON(mp) ?
 529			xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 530						flags & XFS_QMOPT_DQALLOC,
 531						ip->i_udquot, &ip->i_gdquot) :
 532			xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 533						flags & XFS_QMOPT_DQALLOC,
 534						ip->i_udquot, &ip->i_gdquot);
 535		/*
 536		 * Don't worry about the udquot that we may have
 537		 * attached above. It'll get detached, if not already.
 538		 */
 539		if (error)
 540			goto done;
 541		nquotas++;
 542	}
 543
 544	/*
 545	 * Attach this group quota to the user quota as a hint.
 546	 * This WON'T, in general, result in a thrash.
 547	 */
 548	if (nquotas == 2) {
 549		ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 550		ASSERT(ip->i_udquot);
 551		ASSERT(ip->i_gdquot);
 552
 553		/*
 554		 * We do not have i_udquot locked at this point, but this check
 555		 * is OK since we don't depend on the i_gdquot to be accurate
 556		 * 100% all the time. It is just a hint, and this will
 557		 * succeed in general.
 558		 */
 559		if (ip->i_udquot->q_gdquot != ip->i_gdquot)
 560			xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot);
 561	}
 562
 563 done:
 564#ifdef DEBUG
 565	if (!error) {
 566		if (XFS_IS_UQUOTA_ON(mp))
 567			ASSERT(ip->i_udquot);
 568		if (XFS_IS_OQUOTA_ON(mp))
 569			ASSERT(ip->i_gdquot);
 570	}
 571	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 572#endif
 
 
 
 
 
 573	return error;
 574}
 575
 576int
 577xfs_qm_dqattach(
 578	struct xfs_inode	*ip,
 579	uint			flags)
 580{
 581	int			error;
 582
 583	if (!xfs_qm_need_dqattach(ip))
 584		return 0;
 585
 586	xfs_ilock(ip, XFS_ILOCK_EXCL);
 587	error = xfs_qm_dqattach_locked(ip, flags);
 588	xfs_iunlock(ip, XFS_ILOCK_EXCL);
 589
 590	return error;
 591}
 592
 593/*
 594 * Release dquots (and their references) if any.
 595 * The inode should be locked EXCL except when this's called by
 596 * xfs_ireclaim.
 597 */
 598void
 599xfs_qm_dqdetach(
 600	xfs_inode_t	*ip)
 601{
 602	if (!(ip->i_udquot || ip->i_gdquot))
 603		return;
 604
 605	trace_xfs_dquot_dqdetach(ip);
 606
 607	ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_uquotino);
 608	ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_gquotino);
 609	if (ip->i_udquot) {
 610		xfs_qm_dqrele(ip->i_udquot);
 611		ip->i_udquot = NULL;
 612	}
 613	if (ip->i_gdquot) {
 614		xfs_qm_dqrele(ip->i_gdquot);
 615		ip->i_gdquot = NULL;
 616	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 617}
 618
 619/*
 620 * This initializes all the quota information that's kept in the
 621 * mount structure
 622 */
 623STATIC int
 624xfs_qm_init_quotainfo(
 625	xfs_mount_t	*mp)
 626{
 627	xfs_quotainfo_t *qinf;
 628	int		error;
 629	xfs_dquot_t	*dqp;
 
 630
 631	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 
 632
 633	qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 
 
 634
 635	/*
 636	 * See if quotainodes are setup, and if not, allocate them,
 637	 * and change the superblock accordingly.
 638	 */
 639	if ((error = xfs_qm_init_quotainos(mp))) {
 640		kmem_free(qinf);
 641		mp->m_quotainfo = NULL;
 642		return error;
 643	}
 
 644
 645	INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 646	INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 
 647	mutex_init(&qinf->qi_tree_lock);
 648
 649	INIT_LIST_HEAD(&qinf->qi_lru_list);
 650	qinf->qi_lru_count = 0;
 651	mutex_init(&qinf->qi_lru_lock);
 652
 653	/* mutex used to serialize quotaoffs */
 654	mutex_init(&qinf->qi_quotaofflock);
 655
 656	/* Precalc some constants */
 657	qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 658	ASSERT(qinf->qi_dqchunklen);
 659	qinf->qi_dqperchunk = BBTOB(qinf->qi_dqchunklen);
 660	do_div(qinf->qi_dqperchunk, sizeof(xfs_dqblk_t));
 
 
 
 
 
 
 
 
 
 661
 662	mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 663
 664	/*
 665	 * We try to get the limits from the superuser's limits fields.
 666	 * This is quite hacky, but it is standard quota practice.
 667	 *
 668	 * We look at the USR dquot with id == 0 first, but if user quotas
 669	 * are not enabled we goto the GRP dquot with id == 0.
 670	 * We don't really care to keep separate default limits for user
 671	 * and group quotas, at least not at this point.
 672	 *
 673	 * Since we may not have done a quotacheck by this point, just read
 674	 * the dquot without attaching it to any hashtables or lists.
 675	 */
 676	error = xfs_qm_dqread(mp, 0,
 677			XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 678			 (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 679			  XFS_DQ_PROJ),
 680			XFS_QMOPT_DOWARN, &dqp);
 681	if (!error) {
 682		xfs_disk_dquot_t	*ddqp = &dqp->q_core;
 
 
 683
 684		/*
 685		 * The warnings and timers set the grace period given to
 686		 * a user or group before he or she can not perform any
 687		 * more writing. If it is zero, a default is used.
 688		 */
 689		qinf->qi_btimelimit = ddqp->d_btimer ?
 690			be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 691		qinf->qi_itimelimit = ddqp->d_itimer ?
 692			be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 693		qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 694			be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 695		qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 696			be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 697		qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 698			be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 699		qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 700			be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 701		qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 702		qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 703		qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 704		qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 705		qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 706		qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 707 
 708		xfs_qm_dqdestroy(dqp);
 709	} else {
 710		qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 711		qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 712		qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 713		qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 714		qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 715		qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 716	}
 717
 718	qinf->qi_shrinker.shrink = xfs_qm_shake;
 719	qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 720	register_shrinker(&qinf->qi_shrinker);
 721	return 0;
 722}
 723
 
 
 
 
 
 
 
 
 
 
 
 724
 725/*
 726 * Gets called when unmounting a filesystem or when all quotas get
 727 * turned off.
 728 * This purges the quota inodes, destroys locks and frees itself.
 729 */
 730void
 731xfs_qm_destroy_quotainfo(
 732	xfs_mount_t	*mp)
 733{
 734	xfs_quotainfo_t *qi;
 735
 736	qi = mp->m_quotainfo;
 737	ASSERT(qi != NULL);
 738
 739	unregister_shrinker(&qi->qi_shrinker);
 740
 741	if (qi->qi_uquotaip) {
 742		IRELE(qi->qi_uquotaip);
 743		qi->qi_uquotaip = NULL; /* paranoia */
 744	}
 745	if (qi->qi_gquotaip) {
 746		IRELE(qi->qi_gquotaip);
 747		qi->qi_gquotaip = NULL;
 748	}
 749	mutex_destroy(&qi->qi_quotaofflock);
 750	kmem_free(qi);
 751	mp->m_quotainfo = NULL;
 752}
 753
 
 
 
 
 
 
 
 
 
 
 
 754/*
 755 * Create an inode and return with a reference already taken, but unlocked
 756 * This is how we create quota inodes
 757 */
 758STATIC int
 759xfs_qm_qino_alloc(
 760	xfs_mount_t	*mp,
 761	xfs_inode_t	**ip,
 762	__int64_t	sbfields,
 763	uint		flags)
 764{
 765	xfs_trans_t	*tp;
 766	int		error;
 767	int		committed;
 768
 769	tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 770	if ((error = xfs_trans_reserve(tp,
 771				      XFS_QM_QINOCREATE_SPACE_RES(mp),
 772				      XFS_CREATE_LOG_RES(mp), 0,
 773				      XFS_TRANS_PERM_LOG_RES,
 774				      XFS_CREATE_LOG_COUNT))) {
 775		xfs_trans_cancel(tp, 0);
 776		return error;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 777	}
 778
 779	error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip, &committed);
 780	if (error) {
 781		xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 782				 XFS_TRANS_ABORT);
 783		return error;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 784	}
 785
 786	/*
 787	 * Make the changes in the superblock, and log those too.
 788	 * sbfields arg may contain fields other than *QUOTINO;
 789	 * VERSIONNUM for example.
 790	 */
 791	spin_lock(&mp->m_sb_lock);
 792	if (flags & XFS_QMOPT_SBVERSION) {
 793		ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 794		ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 795				   XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
 796		       (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 797			XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
 798
 799		xfs_sb_version_addquota(&mp->m_sb);
 800		mp->m_sb.sb_uquotino = NULLFSINO;
 801		mp->m_sb.sb_gquotino = NULLFSINO;
 
 802
 803		/* qflags will get updated _after_ quotacheck */
 804		mp->m_sb.sb_qflags = 0;
 805	}
 806	if (flags & XFS_QMOPT_UQUOTA)
 807		mp->m_sb.sb_uquotino = (*ip)->i_ino;
 
 
 808	else
 809		mp->m_sb.sb_gquotino = (*ip)->i_ino;
 810	spin_unlock(&mp->m_sb_lock);
 811	xfs_mod_sb(tp, sbfields);
 812
 813	if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
 
 
 814		xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 815		return error;
 816	}
 817	return 0;
 
 
 
 
 818}
 819
 820
 821STATIC void
 822xfs_qm_reset_dqcounts(
 823	xfs_mount_t	*mp,
 824	xfs_buf_t	*bp,
 825	xfs_dqid_t	id,
 826	uint		type)
 827{
 828	xfs_disk_dquot_t	*ddq;
 829	int			j;
 830
 831	trace_xfs_reset_dqcounts(bp, _RET_IP_);
 832
 833	/*
 834	 * Reset all counters and timers. They'll be
 835	 * started afresh by xfs_qm_quotacheck.
 836	 */
 837#ifdef DEBUG
 838	j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 839	do_div(j, sizeof(xfs_dqblk_t));
 840	ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 841#endif
 842	ddq = bp->b_addr;
 843	for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 
 
 
 
 844		/*
 845		 * Do a sanity check, and if needed, repair the dqblk. Don't
 846		 * output any warnings because it's perfectly possible to
 847		 * find uninitialised dquot blks. See comment in xfs_qm_dqcheck.
 
 
 
 
 
 
 
 
 
 848		 */
 849		(void) xfs_qm_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 850				      "xfs_quotacheck");
 851		ddq->d_bcount = 0;
 852		ddq->d_icount = 0;
 853		ddq->d_rtbcount = 0;
 854		ddq->d_btimer = 0;
 855		ddq->d_itimer = 0;
 856		ddq->d_rtbtimer = 0;
 857		ddq->d_bwarns = 0;
 858		ddq->d_iwarns = 0;
 859		ddq->d_rtbwarns = 0;
 860		ddq = (xfs_disk_dquot_t *) ((xfs_dqblk_t *)ddq + 1);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 861	}
 862}
 863
 864STATIC int
 865xfs_qm_dqiter_bufs(
 866	struct xfs_mount	*mp,
 867	xfs_dqid_t		firstid,
 868	xfs_fsblock_t		bno,
 869	xfs_filblks_t		blkcnt,
 870	uint			flags,
 871	struct list_head	*buffer_list)
 872{
 873	struct xfs_buf		*bp;
 874	int			error;
 875	int			type;
 876
 877	ASSERT(blkcnt > 0);
 878	type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 879		(flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 880	error = 0;
 881
 882	/*
 883	 * Blkcnt arg can be a very big number, and might even be
 884	 * larger than the log itself. So, we have to break it up into
 885	 * manageable-sized transactions.
 886	 * Note that we don't start a permanent transaction here; we might
 887	 * not be able to get a log reservation for the whole thing up front,
 888	 * and we don't really care to either, because we just discard
 889	 * everything if we were to crash in the middle of this loop.
 890	 */
 891	while (blkcnt--) {
 892		error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 893			      XFS_FSB_TO_DADDR(mp, bno),
 894			      mp->m_quotainfo->qi_dqchunklen, 0, &bp);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 895		if (error)
 896			break;
 897
 
 
 
 
 
 
 898		xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 899		xfs_buf_delwri_queue(bp, buffer_list);
 900		xfs_buf_relse(bp);
 901		/*
 902		 * goto the next block.
 903		 */
 904		bno++;
 905		firstid += mp->m_quotainfo->qi_dqperchunk;
 906	}
 907
 908	return error;
 909}
 910
 911/*
 912 * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
 913 * caller supplied function for every chunk of dquots that we find.
 914 */
 915STATIC int
 916xfs_qm_dqiterate(
 917	struct xfs_mount	*mp,
 918	struct xfs_inode	*qip,
 919	uint			flags,
 920	struct list_head	*buffer_list)
 921{
 922	struct xfs_bmbt_irec	*map;
 923	int			i, nmaps;	/* number of map entries */
 924	int			error;		/* return value */
 925	xfs_fileoff_t		lblkno;
 926	xfs_filblks_t		maxlblkcnt;
 927	xfs_dqid_t		firstid;
 928	xfs_fsblock_t		rablkno;
 929	xfs_filblks_t		rablkcnt;
 930
 931	error = 0;
 932	/*
 933	 * This looks racy, but we can't keep an inode lock across a
 934	 * trans_reserve. But, this gets called during quotacheck, and that
 935	 * happens only at mount time which is single threaded.
 936	 */
 937	if (qip->i_d.di_nblocks == 0)
 938		return 0;
 939
 940	map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
 
 941
 942	lblkno = 0;
 943	maxlblkcnt = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
 944	do {
 
 
 945		nmaps = XFS_DQITER_MAP_SIZE;
 946		/*
 947		 * We aren't changing the inode itself. Just changing
 948		 * some of its data. No new blocks are added here, and
 949		 * the inode is never added to the transaction.
 950		 */
 951		xfs_ilock(qip, XFS_ILOCK_SHARED);
 952		error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 953				       map, &nmaps, 0);
 954		xfs_iunlock(qip, XFS_ILOCK_SHARED);
 955		if (error)
 956			break;
 957
 958		ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
 959		for (i = 0; i < nmaps; i++) {
 960			ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
 961			ASSERT(map[i].br_blockcount);
 962
 963
 964			lblkno += map[i].br_blockcount;
 965
 966			if (map[i].br_startblock == HOLESTARTBLOCK)
 967				continue;
 968
 969			firstid = (xfs_dqid_t) map[i].br_startoff *
 970				mp->m_quotainfo->qi_dqperchunk;
 971			/*
 972			 * Do a read-ahead on the next extent.
 973			 */
 974			if ((i+1 < nmaps) &&
 975			    (map[i+1].br_startblock != HOLESTARTBLOCK)) {
 976				rablkcnt =  map[i+1].br_blockcount;
 977				rablkno = map[i+1].br_startblock;
 978				while (rablkcnt--) {
 979					xfs_buf_readahead(mp->m_ddev_targp,
 980					       XFS_FSB_TO_DADDR(mp, rablkno),
 981					       mp->m_quotainfo->qi_dqchunklen);
 
 982					rablkno++;
 983				}
 984			}
 985			/*
 986			 * Iterate thru all the blks in the extent and
 987			 * reset the counters of all the dquots inside them.
 988			 */
 989			error = xfs_qm_dqiter_bufs(mp, firstid,
 990						   map[i].br_startblock,
 991						   map[i].br_blockcount,
 992						   flags, buffer_list);
 993			if (error)
 994				goto out;
 995		}
 996	} while (nmaps > 0);
 997
 998out:
 999	kmem_free(map);
1000	return error;
1001}
1002
1003/*
1004 * Called by dqusage_adjust in doing a quotacheck.
1005 *
1006 * Given the inode, and a dquot id this updates both the incore dqout as well
1007 * as the buffer copy. This is so that once the quotacheck is done, we can
1008 * just log all the buffers, as opposed to logging numerous updates to
1009 * individual dquots.
1010 */
1011STATIC int
1012xfs_qm_quotacheck_dqadjust(
1013	struct xfs_inode	*ip,
1014	xfs_dqid_t		id,
1015	uint			type,
1016	xfs_qcnt_t		nblks,
1017	xfs_qcnt_t		rtblks)
1018{
1019	struct xfs_mount	*mp = ip->i_mount;
1020	struct xfs_dquot	*dqp;
 
1021	int			error;
1022
1023	error = xfs_qm_dqget(mp, ip, id, type,
1024			     XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1025	if (error) {
1026		/*
1027		 * Shouldn't be able to turn off quotas here.
1028		 */
1029		ASSERT(error != ESRCH);
1030		ASSERT(error != ENOENT);
1031		return error;
1032	}
1033
 
 
 
 
1034	trace_xfs_dqadjust(dqp);
1035
1036	/*
1037	 * Adjust the inode count and the block count to reflect this inode's
1038	 * resource usage.
1039	 */
1040	be64_add_cpu(&dqp->q_core.d_icount, 1);
1041	dqp->q_res_icount++;
1042	if (nblks) {
1043		be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1044		dqp->q_res_bcount += nblks;
1045	}
1046	if (rtblks) {
1047		be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1048		dqp->q_res_rtbcount += rtblks;
1049	}
1050
1051	/*
1052	 * Set default limits, adjust timers (since we changed usages)
1053	 *
1054	 * There are no timers for the default values set in the root dquot.
1055	 */
1056	if (dqp->q_core.d_id) {
1057		xfs_qm_adjust_dqlimits(mp, &dqp->q_core);
1058		xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1059	}
1060
1061	dqp->dq_flags |= XFS_DQ_DIRTY;
1062	xfs_qm_dqput(dqp);
1063	return 0;
1064}
1065
1066STATIC int
1067xfs_qm_get_rtblks(
1068	xfs_inode_t	*ip,
1069	xfs_qcnt_t	*O_rtblks)
1070{
1071	xfs_filblks_t	rtblks;			/* total rt blks */
1072	xfs_extnum_t	idx;			/* extent record index */
1073	xfs_ifork_t	*ifp;			/* inode fork pointer */
1074	xfs_extnum_t	nextents;		/* number of extent entries */
1075	int		error;
1076
1077	ASSERT(XFS_IS_REALTIME_INODE(ip));
1078	ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1079	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1080		if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1081			return error;
1082	}
1083	rtblks = 0;
1084	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1085	for (idx = 0; idx < nextents; idx++)
1086		rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1087	*O_rtblks = (xfs_qcnt_t)rtblks;
1088	return 0;
1089}
1090
1091/*
1092 * callback routine supplied to bulkstat(). Given an inumber, find its
1093 * dquots and update them to account for resources taken by that inode.
1094 */
1095/* ARGSUSED */
1096STATIC int
1097xfs_qm_dqusage_adjust(
1098	xfs_mount_t	*mp,		/* mount point for filesystem */
1099	xfs_ino_t	ino,		/* inode number to get data for */
1100	void		__user *buffer,	/* not used */
1101	int		ubsize,		/* not used */
1102	int		*ubused,	/* not used */
1103	int		*res)		/* result code value */
1104{
1105	xfs_inode_t	*ip;
1106	xfs_qcnt_t	nblks, rtblks = 0;
1107	int		error;
1108
1109	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1110
1111	/*
1112	 * rootino must have its resources accounted for, not so with the quota
1113	 * inodes.
1114	 */
1115	if (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino) {
1116		*res = BULKSTAT_RV_NOTHING;
1117		return XFS_ERROR(EINVAL);
1118	}
1119
1120	/*
1121	 * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1122	 * interface expects the inode to be exclusively locked because that's
1123	 * the case in all other instances. It's OK that we do this because
1124	 * quotacheck is done only at mount time.
1125	 */
1126	error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1127	if (error) {
1128		*res = BULKSTAT_RV_NOTHING;
 
1129		return error;
 
 
 
 
 
 
 
 
 
 
 
 
1130	}
1131
 
 
 
 
1132	ASSERT(ip->i_delayed_blks == 0);
1133
 
1134	if (XFS_IS_REALTIME_INODE(ip)) {
1135		/*
1136		 * Walk thru the extent list and count the realtime blocks.
1137		 */
1138		error = xfs_qm_get_rtblks(ip, &rtblks);
1139		if (error)
1140			goto error0;
 
1141	}
1142
1143	nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
 
1144
1145	/*
1146	 * Add the (disk blocks and inode) resources occupied by this
1147	 * inode to its dquots. We do this adjustment in the incore dquot,
1148	 * and also copy the changes to its buffer.
1149	 * We don't care about putting these changes in a transaction
1150	 * envelope because if we crash in the middle of a 'quotacheck'
1151	 * we have to start from the beginning anyway.
1152	 * Once we're done, we'll log all the dquot bufs.
1153	 *
1154	 * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1155	 * and quotaoffs don't race. (Quotachecks happen at mount time only).
1156	 */
1157	if (XFS_IS_UQUOTA_ON(mp)) {
1158		error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1159						   XFS_DQ_USER, nblks, rtblks);
1160		if (error)
1161			goto error0;
1162	}
1163
1164	if (XFS_IS_GQUOTA_ON(mp)) {
1165		error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1166						   XFS_DQ_GROUP, nblks, rtblks);
1167		if (error)
1168			goto error0;
1169	}
1170
1171	if (XFS_IS_PQUOTA_ON(mp)) {
1172		error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1173						   XFS_DQ_PROJ, nblks, rtblks);
1174		if (error)
1175			goto error0;
1176	}
1177
1178	xfs_iunlock(ip, XFS_ILOCK_EXCL);
1179	IRELE(ip);
1180	*res = BULKSTAT_RV_DIDONE;
1181	return 0;
1182
1183error0:
1184	xfs_iunlock(ip, XFS_ILOCK_EXCL);
1185	IRELE(ip);
1186	*res = BULKSTAT_RV_GIVEUP;
1187	return error;
1188}
1189
1190STATIC int
1191xfs_qm_flush_one(
1192	struct xfs_dquot	*dqp,
1193	void			*data)
1194{
 
1195	struct list_head	*buffer_list = data;
1196	struct xfs_buf		*bp = NULL;
1197	int			error = 0;
1198
1199	xfs_dqlock(dqp);
1200	if (dqp->dq_flags & XFS_DQ_FREEING)
1201		goto out_unlock;
1202	if (!XFS_DQ_IS_DIRTY(dqp))
1203		goto out_unlock;
1204
1205	xfs_dqflock(dqp);
1206	error = xfs_qm_dqflush(dqp, &bp);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1207	if (error)
1208		goto out_unlock;
 
 
 
 
1209
1210	xfs_buf_delwri_queue(bp, buffer_list);
 
 
1211	xfs_buf_relse(bp);
1212out_unlock:
1213	xfs_dqunlock(dqp);
1214	return error;
1215}
1216
1217/*
1218 * Walk thru all the filesystem inodes and construct a consistent view
1219 * of the disk quota world. If the quotacheck fails, disable quotas.
1220 */
1221int
1222xfs_qm_quotacheck(
1223	xfs_mount_t	*mp)
1224{
1225	int		done, count, error, error2;
1226	xfs_ino_t	lastino;
1227	size_t		structsz;
1228	xfs_inode_t	*uip, *gip;
1229	uint		flags;
1230	LIST_HEAD	(buffer_list);
1231
1232	count = INT_MAX;
1233	structsz = 1;
1234	lastino = 0;
1235	flags = 0;
1236
1237	ASSERT(mp->m_quotainfo->qi_uquotaip || mp->m_quotainfo->qi_gquotaip);
1238	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1239
1240	xfs_notice(mp, "Quotacheck needed: Please wait.");
1241
1242	/*
1243	 * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1244	 * their counters to zero. We need a clean slate.
1245	 * We don't log our changes till later.
1246	 */
1247	uip = mp->m_quotainfo->qi_uquotaip;
1248	if (uip) {
1249		error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1250					 &buffer_list);
1251		if (error)
1252			goto error_return;
1253		flags |= XFS_UQUOTA_CHKD;
1254	}
1255
1256	gip = mp->m_quotainfo->qi_gquotaip;
1257	if (gip) {
1258		error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
1259					 XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA,
1260					 &buffer_list);
1261		if (error)
1262			goto error_return;
1263		flags |= XFS_OQUOTA_CHKD;
1264	}
1265
1266	do {
1267		/*
1268		 * Iterate thru all the inodes in the file system,
1269		 * adjusting the corresponding dquot counters in core.
1270		 */
1271		error = xfs_bulkstat(mp, &lastino, &count,
1272				     xfs_qm_dqusage_adjust,
1273				     structsz, NULL, &done);
1274		if (error)
1275			break;
 
 
 
 
 
 
 
1276
1277	} while (!done);
 
 
 
 
 
 
1278
1279	/*
1280	 * We've made all the changes that we need to make incore.  Flush them
1281	 * down to disk buffers if everything was updated successfully.
1282	 */
1283	if (XFS_IS_UQUOTA_ON(mp)) {
1284		error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1285					  &buffer_list);
1286	}
1287	if (XFS_IS_GQUOTA_ON(mp)) {
1288		error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1289					   &buffer_list);
1290		if (!error)
1291			error = error2;
1292	}
1293	if (XFS_IS_PQUOTA_ON(mp)) {
1294		error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1295					   &buffer_list);
1296		if (!error)
1297			error = error2;
1298	}
1299
1300	error2 = xfs_buf_delwri_submit(&buffer_list);
1301	if (!error)
1302		error = error2;
1303
1304	/*
1305	 * We can get this error if we couldn't do a dquot allocation inside
1306	 * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1307	 * dirty dquots that might be cached, we just want to get rid of them
1308	 * and turn quotaoff. The dquots won't be attached to any of the inodes
1309	 * at this point (because we intentionally didn't in dqget_noattach).
1310	 */
1311	if (error) {
1312		xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1313		goto error_return;
1314	}
1315
1316	/*
1317	 * If one type of quotas is off, then it will lose its
1318	 * quotachecked status, since we won't be doing accounting for
1319	 * that type anymore.
1320	 */
1321	mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1322	mp->m_qflags |= flags;
1323
1324 error_return:
1325	while (!list_empty(&buffer_list)) {
1326		struct xfs_buf *bp =
1327			list_first_entry(&buffer_list, struct xfs_buf, b_list);
1328		list_del_init(&bp->b_list);
1329		xfs_buf_relse(bp);
1330	}
1331
1332	if (error) {
1333		xfs_warn(mp,
1334	"Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1335			error);
1336		/*
1337		 * We must turn off quotas.
1338		 */
1339		ASSERT(mp->m_quotainfo != NULL);
1340		xfs_qm_destroy_quotainfo(mp);
1341		if (xfs_mount_reset_sbqflags(mp)) {
1342			xfs_warn(mp,
1343				"Quotacheck: Failed to reset quota flags.");
1344		}
1345	} else
 
1346		xfs_notice(mp, "Quotacheck: Done.");
1347	return (error);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1348}
1349
1350/*
1351 * This is called after the superblock has been read in and we're ready to
1352 * iget the quota inodes.
1353 */
1354STATIC int
1355xfs_qm_init_quotainos(
1356	xfs_mount_t	*mp)
1357{
1358	xfs_inode_t	*uip, *gip;
1359	int		error;
1360	__int64_t	sbflags;
1361	uint		flags;
 
1362
1363	ASSERT(mp->m_quotainfo);
1364	uip = gip = NULL;
1365	sbflags = 0;
1366	flags = 0;
1367
1368	/*
1369	 * Get the uquota and gquota inodes
1370	 */
1371	if (xfs_sb_version_hasquota(&mp->m_sb)) {
1372		if (XFS_IS_UQUOTA_ON(mp) &&
1373		    mp->m_sb.sb_uquotino != NULLFSINO) {
1374			ASSERT(mp->m_sb.sb_uquotino > 0);
1375			if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1376					     0, 0, &uip)))
1377				return XFS_ERROR(error);
1378		}
1379		if (XFS_IS_OQUOTA_ON(mp) &&
1380		    mp->m_sb.sb_gquotino != NULLFSINO) {
1381			ASSERT(mp->m_sb.sb_gquotino > 0);
1382			if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1383					     0, 0, &gip))) {
1384				if (uip)
1385					IRELE(uip);
1386				return XFS_ERROR(error);
1387			}
 
 
 
 
1388		}
1389	} else {
1390		flags |= XFS_QMOPT_SBVERSION;
1391		sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1392			    XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
1393	}
1394
1395	/*
1396	 * Create the two inodes, if they don't exist already. The changes
1397	 * made above will get added to a transaction and logged in one of
1398	 * the qino_alloc calls below.  If the device is readonly,
1399	 * temporarily switch to read-write to do this.
1400	 */
1401	if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1402		if ((error = xfs_qm_qino_alloc(mp, &uip,
1403					      sbflags | XFS_SB_UQUOTINO,
1404					      flags | XFS_QMOPT_UQUOTA)))
1405			return XFS_ERROR(error);
1406
1407		flags &= ~XFS_QMOPT_SBVERSION;
1408	}
1409	if (XFS_IS_OQUOTA_ON(mp) && gip == NULL) {
1410		flags |= (XFS_IS_GQUOTA_ON(mp) ?
1411				XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
1412		error = xfs_qm_qino_alloc(mp, &gip,
1413					  sbflags | XFS_SB_GQUOTINO, flags);
1414		if (error) {
1415			if (uip)
1416				IRELE(uip);
1417
1418			return XFS_ERROR(error);
1419		}
 
 
 
 
 
1420	}
1421
1422	mp->m_quotainfo->qi_uquotaip = uip;
1423	mp->m_quotainfo->qi_gquotaip = gip;
 
1424
1425	return 0;
 
 
 
 
 
 
 
 
 
1426}
1427
1428STATIC void
1429xfs_qm_dqfree_one(
1430	struct xfs_dquot	*dqp)
1431{
1432	struct xfs_mount	*mp = dqp->q_mount;
1433	struct xfs_quotainfo	*qi = mp->m_quotainfo;
1434
1435	mutex_lock(&qi->qi_tree_lock);
1436	radix_tree_delete(XFS_DQUOT_TREE(qi, dqp->q_core.d_flags),
1437			  be32_to_cpu(dqp->q_core.d_id));
1438
1439	qi->qi_dquots--;
1440	mutex_unlock(&qi->qi_tree_lock);
1441
1442	xfs_qm_dqdestroy(dqp);
1443}
1444
1445STATIC void
1446xfs_qm_dqreclaim_one(
1447	struct xfs_dquot	*dqp,
1448	struct list_head	*buffer_list,
1449	struct list_head	*dispose_list)
1450{
1451	struct xfs_mount	*mp = dqp->q_mount;
1452	struct xfs_quotainfo	*qi = mp->m_quotainfo;
1453	int			error;
1454
1455	if (!xfs_dqlock_nowait(dqp))
1456		goto out_busy;
1457
1458	/*
1459	 * This dquot has acquired a reference in the meantime remove it from
1460	 * the freelist and try again.
1461	 */
1462	if (dqp->q_nrefs) {
1463		xfs_dqunlock(dqp);
1464
1465		trace_xfs_dqreclaim_want(dqp);
1466		XFS_STATS_INC(xs_qm_dqwants);
1467
1468		list_del_init(&dqp->q_lru);
1469		qi->qi_lru_count--;
1470		XFS_STATS_DEC(xs_qm_dquot_unused);
1471		return;
1472	}
1473
1474	/*
1475	 * Try to grab the flush lock. If this dquot is in the process of
1476	 * getting flushed to disk, we don't want to reclaim it.
1477	 */
1478	if (!xfs_dqflock_nowait(dqp))
1479		goto out_busy;
1480
1481	if (XFS_DQ_IS_DIRTY(dqp)) {
1482		struct xfs_buf	*bp = NULL;
1483
1484		trace_xfs_dqreclaim_dirty(dqp);
1485
1486		error = xfs_qm_dqflush(dqp, &bp);
1487		if (error) {
1488			xfs_warn(mp, "%s: dquot %p flush failed",
1489				 __func__, dqp);
1490			goto out_busy;
1491		}
1492
1493		xfs_buf_delwri_queue(bp, buffer_list);
1494		xfs_buf_relse(bp);
1495		/*
1496		 * Give the dquot another try on the freelist, as the
1497		 * flushing will take some time.
1498		 */
1499		goto out_busy;
1500	}
1501	xfs_dqfunlock(dqp);
1502
1503	/*
1504	 * Prevent lookups now that we are past the point of no return.
1505	 */
1506	dqp->dq_flags |= XFS_DQ_FREEING;
1507	xfs_dqunlock(dqp);
1508
1509	ASSERT(dqp->q_nrefs == 0);
1510	list_move_tail(&dqp->q_lru, dispose_list);
1511	qi->qi_lru_count--;
1512	XFS_STATS_DEC(xs_qm_dquot_unused);
1513
1514	trace_xfs_dqreclaim_done(dqp);
1515	XFS_STATS_INC(xs_qm_dqreclaims);
1516	return;
1517
1518out_busy:
1519	xfs_dqunlock(dqp);
1520
1521	/*
1522	 * Move the dquot to the tail of the list so that we don't spin on it.
1523	 */
1524	list_move_tail(&dqp->q_lru, &qi->qi_lru_list);
1525
1526	trace_xfs_dqreclaim_busy(dqp);
1527	XFS_STATS_INC(xs_qm_dqreclaim_misses);
1528}
1529
1530STATIC int
1531xfs_qm_shake(
1532	struct shrinker		*shrink,
1533	struct shrink_control	*sc)
1534{
1535	struct xfs_quotainfo	*qi =
1536		container_of(shrink, struct xfs_quotainfo, qi_shrinker);
1537	int			nr_to_scan = sc->nr_to_scan;
1538	LIST_HEAD		(buffer_list);
1539	LIST_HEAD		(dispose_list);
1540	struct xfs_dquot	*dqp;
1541	int			error;
1542
1543	if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
1544		return 0;
1545	if (!nr_to_scan)
1546		goto out;
1547
1548	mutex_lock(&qi->qi_lru_lock);
1549	while (!list_empty(&qi->qi_lru_list)) {
1550		if (nr_to_scan-- <= 0)
1551			break;
1552		dqp = list_first_entry(&qi->qi_lru_list, struct xfs_dquot,
1553				       q_lru);
1554		xfs_qm_dqreclaim_one(dqp, &buffer_list, &dispose_list);
1555	}
1556	mutex_unlock(&qi->qi_lru_lock);
1557
1558	error = xfs_buf_delwri_submit(&buffer_list);
1559	if (error)
1560		xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
1561
1562	while (!list_empty(&dispose_list)) {
1563		dqp = list_first_entry(&dispose_list, struct xfs_dquot, q_lru);
1564		list_del_init(&dqp->q_lru);
1565		xfs_qm_dqfree_one(dqp);
1566	}
1567
1568out:
1569	return (qi->qi_lru_count / 100) * sysctl_vfs_cache_pressure;
1570}
1571
1572/*
1573 * Start a transaction and write the incore superblock changes to
1574 * disk. flags parameter indicates which fields have changed.
1575 */
1576int
1577xfs_qm_write_sb_changes(
1578	xfs_mount_t	*mp,
1579	__int64_t	flags)
1580{
1581	xfs_trans_t	*tp;
1582	int		error;
1583
1584	tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
1585	if ((error = xfs_trans_reserve(tp, 0,
1586				      mp->m_sb.sb_sectsize + 128, 0,
1587				      0,
1588				      XFS_DEFAULT_LOG_COUNT))) {
1589		xfs_trans_cancel(tp, 0);
1590		return error;
1591	}
1592
1593	xfs_mod_sb(tp, flags);
1594	error = xfs_trans_commit(tp, 0);
1595
1596	return error;
1597}
1598
1599
1600/* --------------- utility functions for vnodeops ---------------- */
1601
1602
1603/*
1604 * Given an inode, a uid, gid and prid make sure that we have
1605 * allocated relevant dquot(s) on disk, and that we won't exceed inode
1606 * quotas by creating this file.
1607 * This also attaches dquot(s) to the given inode after locking it,
1608 * and returns the dquots corresponding to the uid and/or gid.
1609 *
1610 * in	: inode (unlocked)
1611 * out	: udquot, gdquot with references taken and unlocked
1612 */
1613int
1614xfs_qm_vop_dqalloc(
1615	struct xfs_inode	*ip,
1616	uid_t			uid,
1617	gid_t			gid,
1618	prid_t			prid,
1619	uint			flags,
1620	struct xfs_dquot	**O_udqpp,
1621	struct xfs_dquot	**O_gdqpp)
 
1622{
1623	struct xfs_mount	*mp = ip->i_mount;
1624	struct xfs_dquot	*uq, *gq;
 
 
 
 
1625	int			error;
1626	uint			lockflags;
1627
1628	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1629		return 0;
1630
 
 
1631	lockflags = XFS_ILOCK_EXCL;
1632	xfs_ilock(ip, lockflags);
1633
1634	if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1635		gid = ip->i_d.di_gid;
1636
1637	/*
1638	 * Attach the dquot(s) to this inode, doing a dquot allocation
1639	 * if necessary. The dquot(s) will not be locked.
1640	 */
1641	if (XFS_NOT_DQATTACHED(mp, ip)) {
1642		error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1643		if (error) {
1644			xfs_iunlock(ip, lockflags);
1645			return error;
1646		}
1647	}
1648
1649	uq = gq = NULL;
1650	if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1651		if (ip->i_d.di_uid != uid) {
 
1652			/*
1653			 * What we need is the dquot that has this uid, and
1654			 * if we send the inode to dqget, the uid of the inode
1655			 * takes priority over what's sent in the uid argument.
1656			 * We must unlock inode here before calling dqget if
1657			 * we're not sending the inode, because otherwise
1658			 * we'll deadlock by doing trans_reserve while
1659			 * holding ilock.
1660			 */
1661			xfs_iunlock(ip, lockflags);
1662			if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
1663						 XFS_DQ_USER,
1664						 XFS_QMOPT_DQALLOC |
1665						 XFS_QMOPT_DOWARN,
1666						 &uq))) {
1667				ASSERT(error != ENOENT);
1668				return error;
1669			}
1670			/*
1671			 * Get the ilock in the right order.
1672			 */
1673			xfs_dqunlock(uq);
1674			lockflags = XFS_ILOCK_SHARED;
1675			xfs_ilock(ip, lockflags);
1676		} else {
1677			/*
1678			 * Take an extra reference, because we'll return
1679			 * this to caller
1680			 */
1681			ASSERT(ip->i_udquot);
1682			uq = xfs_qm_dqhold(ip->i_udquot);
1683		}
1684	}
1685	if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1686		if (ip->i_d.di_gid != gid) {
 
1687			xfs_iunlock(ip, lockflags);
1688			if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)gid,
1689						 XFS_DQ_GROUP,
1690						 XFS_QMOPT_DQALLOC |
1691						 XFS_QMOPT_DOWARN,
1692						 &gq))) {
1693				if (uq)
1694					xfs_qm_dqrele(uq);
1695				ASSERT(error != ENOENT);
1696				return error;
1697			}
1698			xfs_dqunlock(gq);
1699			lockflags = XFS_ILOCK_SHARED;
1700			xfs_ilock(ip, lockflags);
1701		} else {
1702			ASSERT(ip->i_gdquot);
1703			gq = xfs_qm_dqhold(ip->i_gdquot);
1704		}
1705	} else if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1706		if (xfs_get_projid(ip) != prid) {
 
 
1707			xfs_iunlock(ip, lockflags);
1708			if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1709						 XFS_DQ_PROJ,
1710						 XFS_QMOPT_DQALLOC |
1711						 XFS_QMOPT_DOWARN,
1712						 &gq))) {
1713				if (uq)
1714					xfs_qm_dqrele(uq);
1715				ASSERT(error != ENOENT);
1716				return (error);
1717			}
1718			xfs_dqunlock(gq);
1719			lockflags = XFS_ILOCK_SHARED;
1720			xfs_ilock(ip, lockflags);
1721		} else {
1722			ASSERT(ip->i_gdquot);
1723			gq = xfs_qm_dqhold(ip->i_gdquot);
1724		}
1725	}
1726	if (uq)
1727		trace_xfs_dquot_dqalloc(ip);
1728
1729	xfs_iunlock(ip, lockflags);
1730	if (O_udqpp)
1731		*O_udqpp = uq;
1732	else if (uq)
1733		xfs_qm_dqrele(uq);
1734	if (O_gdqpp)
1735		*O_gdqpp = gq;
1736	else if (gq)
1737		xfs_qm_dqrele(gq);
 
 
 
 
1738	return 0;
 
 
 
 
 
1739}
1740
1741/*
1742 * Actually transfer ownership, and do dquot modifications.
1743 * These were already reserved.
1744 */
1745xfs_dquot_t *
1746xfs_qm_vop_chown(
1747	xfs_trans_t	*tp,
1748	xfs_inode_t	*ip,
1749	xfs_dquot_t	**IO_olddq,
1750	xfs_dquot_t	*newdq)
1751{
1752	xfs_dquot_t	*prevdq;
1753	uint		bfield = XFS_IS_REALTIME_INODE(ip) ?
1754				 XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1755
1756
1757	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1758	ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1759
1760	/* old dquot */
1761	prevdq = *IO_olddq;
1762	ASSERT(prevdq);
1763	ASSERT(prevdq != newdq);
1764
1765	xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1766	xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
 
 
 
 
 
1767
1768	/* the sparkling new dquot */
1769	xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1770	xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1771
1772	/*
1773	 * Take an extra reference, because the inode is going to keep
1774	 * this dquot pointer even after the trans_commit.
1775	 */
1776	*IO_olddq = xfs_qm_dqhold(newdq);
1777
1778	return prevdq;
1779}
1780
1781/*
1782 * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1783 */
1784int
1785xfs_qm_vop_chown_reserve(
1786	xfs_trans_t	*tp,
1787	xfs_inode_t	*ip,
1788	xfs_dquot_t	*udqp,
1789	xfs_dquot_t	*gdqp,
1790	uint		flags)
1791{
1792	xfs_mount_t	*mp = ip->i_mount;
1793	uint		delblks, blkflags, prjflags = 0;
1794	xfs_dquot_t	*unresudq, *unresgdq, *delblksudq, *delblksgdq;
1795	int		error;
1796
1797
1798	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1799	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1800
1801	delblks = ip->i_delayed_blks;
1802	delblksudq = delblksgdq = unresudq = unresgdq = NULL;
1803	blkflags = XFS_IS_REALTIME_INODE(ip) ?
1804			XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1805
1806	if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1807	    ip->i_d.di_uid != (uid_t)be32_to_cpu(udqp->q_core.d_id)) {
1808		delblksudq = udqp;
1809		/*
1810		 * If there are delayed allocation blocks, then we have to
1811		 * unreserve those from the old dquot, and add them to the
1812		 * new dquot.
1813		 */
1814		if (delblks) {
1815			ASSERT(ip->i_udquot);
1816			unresudq = ip->i_udquot;
1817		}
1818	}
1819	if (XFS_IS_OQUOTA_ON(ip->i_mount) && gdqp) {
1820		if (XFS_IS_PQUOTA_ON(ip->i_mount) &&
1821		     xfs_get_projid(ip) != be32_to_cpu(gdqp->q_core.d_id))
1822			prjflags = XFS_QMOPT_ENOSPC;
1823
1824		if (prjflags ||
1825		    (XFS_IS_GQUOTA_ON(ip->i_mount) &&
1826		     ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id))) {
1827			delblksgdq = gdqp;
1828			if (delblks) {
1829				ASSERT(ip->i_gdquot);
1830				unresgdq = ip->i_gdquot;
1831			}
1832		}
1833	}
1834
1835	if ((error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1836				delblksudq, delblksgdq, ip->i_d.di_nblocks, 1,
1837				flags | blkflags | prjflags)))
1838		return (error);
1839
1840	/*
1841	 * Do the delayed blks reservations/unreservations now. Since, these
1842	 * are done without the help of a transaction, if a reservation fails
1843	 * its previous reservations won't be automatically undone by trans
1844	 * code. So, we have to do it manually here.
1845	 */
1846	if (delblks) {
1847		/*
1848		 * Do the reservations first. Unreservation can't fail.
1849		 */
1850		ASSERT(delblksudq || delblksgdq);
1851		ASSERT(unresudq || unresgdq);
1852		if ((error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1853				delblksudq, delblksgdq, (xfs_qcnt_t)delblks, 0,
1854				flags | blkflags | prjflags)))
1855			return (error);
1856		xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1857				unresudq, unresgdq, -((xfs_qcnt_t)delblks), 0,
1858				blkflags);
1859	}
1860
1861	return (0);
1862}
1863
1864int
1865xfs_qm_vop_rename_dqattach(
1866	struct xfs_inode	**i_tab)
1867{
1868	struct xfs_mount	*mp = i_tab[0]->i_mount;
1869	int			i;
1870
1871	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1872		return 0;
1873
1874	for (i = 0; (i < 4 && i_tab[i]); i++) {
1875		struct xfs_inode	*ip = i_tab[i];
1876		int			error;
1877
1878		/*
1879		 * Watch out for duplicate entries in the table.
1880		 */
1881		if (i == 0 || ip != i_tab[i-1]) {
1882			if (XFS_NOT_DQATTACHED(mp, ip)) {
1883				error = xfs_qm_dqattach(ip, 0);
1884				if (error)
1885					return error;
1886			}
1887		}
1888	}
1889	return 0;
1890}
1891
1892void
1893xfs_qm_vop_create_dqattach(
1894	struct xfs_trans	*tp,
1895	struct xfs_inode	*ip,
1896	struct xfs_dquot	*udqp,
1897	struct xfs_dquot	*gdqp)
 
1898{
1899	struct xfs_mount	*mp = tp->t_mountp;
1900
1901	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1902		return;
1903
1904	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1905	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1906
1907	if (udqp) {
1908		ASSERT(ip->i_udquot == NULL);
1909		ASSERT(XFS_IS_UQUOTA_ON(mp));
1910		ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
1911
1912		ip->i_udquot = xfs_qm_dqhold(udqp);
1913		xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
1914	}
1915	if (gdqp) {
1916		ASSERT(ip->i_gdquot == NULL);
1917		ASSERT(XFS_IS_OQUOTA_ON(mp));
1918		ASSERT((XFS_IS_GQUOTA_ON(mp) ?
1919			ip->i_d.di_gid : xfs_get_projid(ip)) ==
1920				be32_to_cpu(gdqp->q_core.d_id));
1921
1922		ip->i_gdquot = xfs_qm_dqhold(gdqp);
1923		xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
1924	}
 
 
 
 
 
 
 
 
1925}
1926