xfs_qm.c 69.6 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
/*
2 3
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
Linus Torvalds's avatar
Linus Torvalds committed
4
 *
5 6
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
Linus Torvalds's avatar
Linus Torvalds committed
7 8
 * published by the Free Software Foundation.
 *
9 10 11 12
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
Linus Torvalds's avatar
Linus Torvalds committed
13
 *
14 15 16
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
Linus Torvalds's avatar
Linus Torvalds committed
17 18 19
 */
#include "xfs.h"
#include "xfs_fs.h"
20
#include "xfs_bit.h"
Linus Torvalds's avatar
Linus Torvalds committed
21
#include "xfs_log.h"
22
#include "xfs_inum.h"
Linus Torvalds's avatar
Linus Torvalds committed
23 24 25 26 27 28 29 30 31 32 33
#include "xfs_clnt.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_alloc.h"
#include "xfs_dmapi.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
34
#include "xfs_alloc_btree.h"
Linus Torvalds's avatar
Linus Torvalds committed
35 36 37
#include "xfs_ialloc_btree.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
38
#include "xfs_attr_sf.h"
Linus Torvalds's avatar
Linus Torvalds committed
39 40
#include "xfs_dinode.h"
#include "xfs_inode.h"
41 42 43
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_itable.h"
Linus Torvalds's avatar
Linus Torvalds committed
44 45
#include "xfs_rtalloc.h"
#include "xfs_error.h"
46
#include "xfs_bmap.h"
Linus Torvalds's avatar
Linus Torvalds committed
47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62
#include "xfs_rw.h"
#include "xfs_acl.h"
#include "xfs_cap.h"
#include "xfs_mac.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_trans_space.h"
#include "xfs_utils.h"
#include "xfs_qm.h"

/*
 * The global quota manager. There is only one of these for the entire
 * system, _not_ one per file system. XQM keeps track of the overall
 * quota functionality, including maintaining the freelist and hash
 * tables of dquots.
 */
63
mutex_t		xfs_Gqm_lock;
Linus Torvalds's avatar
Linus Torvalds committed
64
struct xfs_qm	*xfs_Gqm;
65
uint		ndquot;
Linus Torvalds's avatar
Linus Torvalds committed
66 67 68

kmem_zone_t	*qm_dqzone;
kmem_zone_t	*qm_dqtrxzone;
69
STATIC kmem_shaker_t	xfs_qm_shaker;
Linus Torvalds's avatar
Linus Torvalds committed
70

71 72 73
STATIC cred_t	xfs_zerocr;
STATIC xfs_inode_t	xfs_zeroino;

Linus Torvalds's avatar
Linus Torvalds committed
74 75 76
STATIC void	xfs_qm_list_init(xfs_dqlist_t *, char *, int);
STATIC void	xfs_qm_list_destroy(xfs_dqlist_t *);

77 78 79 80 81
STATIC void	xfs_qm_freelist_init(xfs_frlist_t *);
STATIC void	xfs_qm_freelist_destroy(xfs_frlist_t *);
STATIC int	xfs_qm_mplist_nowait(xfs_mount_t *);
STATIC int	xfs_qm_dqhashlock_nowait(xfs_dquot_t *);

Linus Torvalds's avatar
Linus Torvalds committed
82
STATIC int	xfs_qm_init_quotainos(xfs_mount_t *);
83
STATIC int	xfs_qm_init_quotainfo(xfs_mount_t *);
84
STATIC int	xfs_qm_shake(int, gfp_t);
Linus Torvalds's avatar
Linus Torvalds committed
85 86 87 88 89 90 91 92 93 94 95 96 97

#ifdef DEBUG
extern mutex_t	qcheck_lock;
#endif

#ifdef QUOTADEBUG
#define XQM_LIST_PRINT(l, NXT, title) \
{ \
	xfs_dquot_t	*dqp; int i = 0; \
	cmn_err(CE_DEBUG, "%s (#%d)", title, (int) (l)->qh_nelems); \
	for (dqp = (l)->qh_next; dqp != NULL; dqp = dqp->NXT) { \
		cmn_err(CE_DEBUG, "   %d.  \"%d (%s)\"   " \
				  "bcnt = %d, icnt = %d, refs = %d", \
98
			++i, (int) be32_to_cpu(dqp->q_core.d_id), \
Linus Torvalds's avatar
Linus Torvalds committed
99
			DQFLAGTO_TYPESTR(dqp),	     \
100 101
			(int) be64_to_cpu(dqp->q_core.d_bcount), \
			(int) be64_to_cpu(dqp->q_core.d_icount), \
Linus Torvalds's avatar
Linus Torvalds committed
102 103 104 105 106 107 108 109 110 111 112 113 114
			(int) dqp->q_nrefs);  } \
}
#else
#define XQM_LIST_PRINT(l, NXT, title) do { } while (0)
#endif

/*
 * Initialize the XQM structure.
 * Note that there is not one quota manager per file system.
 */
STATIC struct xfs_qm *
xfs_Gqm_init(void)
{
115 116 117
	xfs_dqhash_t	*udqhash, *gdqhash;
	xfs_qm_t	*xqm;
	uint		i, hsize, flags = KM_SLEEP | KM_MAYFAIL;
Linus Torvalds's avatar
Linus Torvalds committed
118 119 120 121

	/*
	 * Initialize the dquot hash tables.
	 */
122 123 124 125 126 127 128
	hsize = XFS_QM_HASHSIZE_HIGH;
	while (!(udqhash = kmem_zalloc(hsize * sizeof(xfs_dqhash_t), flags))) {
		if ((hsize >>= 1) <= XFS_QM_HASHSIZE_LOW)
			flags = KM_SLEEP;
	}
	gdqhash = kmem_zalloc(hsize * sizeof(xfs_dqhash_t), KM_SLEEP);
	ndquot = hsize << 8;
Linus Torvalds's avatar
Linus Torvalds committed
129

130 131 132 133
	xqm = kmem_zalloc(sizeof(xfs_qm_t), KM_SLEEP);
	xqm->qm_dqhashmask = hsize - 1;
	xqm->qm_usr_dqhtable = udqhash;
	xqm->qm_grp_dqhtable = gdqhash;
Linus Torvalds's avatar
Linus Torvalds committed
134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172
	ASSERT(xqm->qm_usr_dqhtable != NULL);
	ASSERT(xqm->qm_grp_dqhtable != NULL);

	for (i = 0; i < hsize; i++) {
		xfs_qm_list_init(&(xqm->qm_usr_dqhtable[i]), "uxdqh", i);
		xfs_qm_list_init(&(xqm->qm_grp_dqhtable[i]), "gxdqh", i);
	}

	/*
	 * Freelist of all dquots of all file systems
	 */
	xfs_qm_freelist_init(&(xqm->qm_dqfreelist));

	/*
	 * dquot zone. we register our own low-memory callback.
	 */
	if (!qm_dqzone) {
		xqm->qm_dqzone = kmem_zone_init(sizeof(xfs_dquot_t),
						"xfs_dquots");
		qm_dqzone = xqm->qm_dqzone;
	} else
		xqm->qm_dqzone = qm_dqzone;

	xfs_qm_shaker = kmem_shake_register(xfs_qm_shake);

	/*
	 * The t_dqinfo portion of transactions.
	 */
	if (!qm_dqtrxzone) {
		xqm->qm_dqtrxzone = kmem_zone_init(sizeof(xfs_dquot_acct_t),
						   "xfs_dqtrx");
		qm_dqtrxzone = xqm->qm_dqtrxzone;
	} else
		xqm->qm_dqtrxzone = qm_dqtrxzone;

	atomic_set(&xqm->qm_totaldquots, 0);
	xqm->qm_dqfree_ratio = XFS_QM_DQFREE_RATIO;
	xqm->qm_nrefs = 0;
#ifdef DEBUG
173
	mutex_init(&qcheck_lock);
Linus Torvalds's avatar
Linus Torvalds committed
174 175 176 177 178 179 180
#endif
	return xqm;
}

/*
 * Destroy the global quota manager when its reference count goes to zero.
 */
181
STATIC void
Linus Torvalds's avatar
Linus Torvalds committed
182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291
xfs_qm_destroy(
	struct xfs_qm	*xqm)
{
	int		hsize, i;

	ASSERT(xqm != NULL);
	ASSERT(xqm->qm_nrefs == 0);
	kmem_shake_deregister(xfs_qm_shaker);
	hsize = xqm->qm_dqhashmask + 1;
	for (i = 0; i < hsize; i++) {
		xfs_qm_list_destroy(&(xqm->qm_usr_dqhtable[i]));
		xfs_qm_list_destroy(&(xqm->qm_grp_dqhtable[i]));
	}
	kmem_free(xqm->qm_usr_dqhtable, hsize * sizeof(xfs_dqhash_t));
	kmem_free(xqm->qm_grp_dqhtable, hsize * sizeof(xfs_dqhash_t));
	xqm->qm_usr_dqhtable = NULL;
	xqm->qm_grp_dqhtable = NULL;
	xqm->qm_dqhashmask = 0;
	xfs_qm_freelist_destroy(&(xqm->qm_dqfreelist));
#ifdef DEBUG
	mutex_destroy(&qcheck_lock);
#endif
	kmem_free(xqm, sizeof(xfs_qm_t));
}

/*
 * Called at mount time to let XQM know that another file system is
 * starting quotas. This isn't crucial information as the individual mount
 * structures are pretty independent, but it helps the XQM keep a
 * global view of what's going on.
 */
/* ARGSUSED */
STATIC int
xfs_qm_hold_quotafs_ref(
	struct xfs_mount *mp)
{
	/*
	 * Need to lock the xfs_Gqm structure for things like this. For example,
	 * the structure could disappear between the entry to this routine and
	 * a HOLD operation if not locked.
	 */
	XFS_QM_LOCK(xfs_Gqm);

	if (xfs_Gqm == NULL)
		xfs_Gqm = xfs_Gqm_init();
	/*
	 * We can keep a list of all filesystems with quotas mounted for
	 * debugging and statistical purposes, but ...
	 * Just take a reference and get out.
	 */
	XFS_QM_HOLD(xfs_Gqm);
	XFS_QM_UNLOCK(xfs_Gqm);

	return 0;
}


/*
 * Release the reference that a filesystem took at mount time,
 * so that we know when we need to destroy the entire quota manager.
 */
/* ARGSUSED */
STATIC void
xfs_qm_rele_quotafs_ref(
	struct xfs_mount *mp)
{
	xfs_dquot_t	*dqp, *nextdqp;

	ASSERT(xfs_Gqm);
	ASSERT(xfs_Gqm->qm_nrefs > 0);

	/*
	 * Go thru the freelist and destroy all inactive dquots.
	 */
	xfs_qm_freelist_lock(xfs_Gqm);

	for (dqp = xfs_Gqm->qm_dqfreelist.qh_next;
	     dqp != (xfs_dquot_t *)&(xfs_Gqm->qm_dqfreelist); ) {
		xfs_dqlock(dqp);
		nextdqp = dqp->dq_flnext;
		if (dqp->dq_flags & XFS_DQ_INACTIVE) {
			ASSERT(dqp->q_mount == NULL);
			ASSERT(! XFS_DQ_IS_DIRTY(dqp));
			ASSERT(dqp->HL_PREVP == NULL);
			ASSERT(dqp->MPL_PREVP == NULL);
			XQM_FREELIST_REMOVE(dqp);
			xfs_dqunlock(dqp);
			xfs_qm_dqdestroy(dqp);
		} else {
			xfs_dqunlock(dqp);
		}
		dqp = nextdqp;
	}
	xfs_qm_freelist_unlock(xfs_Gqm);

	/*
	 * Destroy the entire XQM. If somebody mounts with quotaon, this'll
	 * be restarted.
	 */
	XFS_QM_LOCK(xfs_Gqm);
	XFS_QM_RELE(xfs_Gqm);
	if (xfs_Gqm->qm_nrefs == 0) {
		xfs_qm_destroy(xfs_Gqm);
		xfs_Gqm = NULL;
	}
	XFS_QM_UNLOCK(xfs_Gqm);
}

/*
 * This is called at mount time from xfs_mountfs to initialize the quotainfo
292
 * structure and start the global quota manager (xfs_Gqm) if it hasn't done
Linus Torvalds's avatar
Linus Torvalds committed
293 294 295 296 297 298 299 300
 * so already.	Note that the superblock has not been read in yet.
 */
void
xfs_qm_mount_quotainit(
	xfs_mount_t	*mp,
	uint		flags)
{
	/*
301
	 * User, projects or group quotas has to be on.
Linus Torvalds's avatar
Linus Torvalds committed
302
	 */
303
	ASSERT(flags & (XFSMNT_UQUOTA | XFSMNT_PQUOTA | XFSMNT_GQUOTA));
Linus Torvalds's avatar
Linus Torvalds committed
304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320

	/*
	 * Initialize the flags in the mount structure. From this point
	 * onwards we look at m_qflags to figure out if quotas's ON/OFF, etc.
	 * Note that we enforce nothing if accounting is off.
	 * ie.	XFSMNT_*QUOTA must be ON for XFSMNT_*QUOTAENF.
	 * It isn't necessary to take the quotaoff lock to do this; this is
	 * called from mount.
	 */
	if (flags & XFSMNT_UQUOTA) {
		mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
		if (flags & XFSMNT_UQUOTAENF)
			mp->m_qflags |= XFS_UQUOTA_ENFD;
	}
	if (flags & XFSMNT_GQUOTA) {
		mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
		if (flags & XFSMNT_GQUOTAENF)
321 322 323 324 325
			mp->m_qflags |= XFS_OQUOTA_ENFD;
	} else if (flags & XFSMNT_PQUOTA) {
		mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
		if (flags & XFSMNT_PQUOTAENF)
			mp->m_qflags |= XFS_OQUOTA_ENFD;
Linus Torvalds's avatar
Linus Torvalds committed
326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369
	}
}

/*
 * Just destroy the quotainfo structure.
 */
void
xfs_qm_unmount_quotadestroy(
	xfs_mount_t	*mp)
{
	if (mp->m_quotainfo)
		xfs_qm_destroy_quotainfo(mp);
}


/*
 * This is called from xfs_mountfs to start quotas and initialize all
 * necessary data structures like quotainfo.  This is also responsible for
 * running a quotacheck as necessary.  We are guaranteed that the superblock
 * is consistently read in at this point.
 */
int
xfs_qm_mount_quotas(
	xfs_mount_t	*mp,
	int		mfsi_flags)
{
	unsigned long	s;
	int		error = 0;
	uint		sbf;


	/*
	 * If quotas on realtime volumes is not supported, we disable
	 * quotas immediately.
	 */
	if (mp->m_sb.sb_rextents) {
		cmn_err(CE_NOTE,
			"Cannot turn on quotas for realtime filesystem %s",
			mp->m_fsname);
		mp->m_qflags = 0;
		goto write_changes;
	}

	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
370

Linus Torvalds's avatar
Linus Torvalds committed
371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394
	/*
	 * Allocate the quotainfo structure inside the mount struct, and
	 * create quotainode(s), and change/rev superblock if necessary.
	 */
	if ((error = xfs_qm_init_quotainfo(mp))) {
		/*
		 * We must turn off quotas.
		 */
		ASSERT(mp->m_quotainfo == NULL);
		mp->m_qflags = 0;
		goto write_changes;
	}
	/*
	 * If any of the quotas are not consistent, do a quotacheck.
	 */
	if (XFS_QM_NEED_QUOTACHECK(mp) &&
		!(mfsi_flags & XFS_MFSI_NO_QUOTACHECK)) {
		if ((error = xfs_qm_quotacheck(mp))) {
			/* Quotacheck has failed and quotas have
			 * been disabled.
			 */
			return XFS_ERROR(error);
		}
	}
395

Linus Torvalds's avatar
Linus Torvalds committed
396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491
 write_changes:
	/*
	 * We actually don't have to acquire the SB_LOCK at all.
	 * This can only be called from mount, and that's single threaded. XXX
	 */
	s = XFS_SB_LOCK(mp);
	sbf = mp->m_sb.sb_qflags;
	mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
	XFS_SB_UNLOCK(mp, s);

	if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
		if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
			/*
			 * We could only have been turning quotas off.
			 * We aren't in very good shape actually because
			 * the incore structures are convinced that quotas are
			 * off, but the on disk superblock doesn't know that !
			 */
			ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
			xfs_fs_cmn_err(CE_ALERT, mp,
				"XFS mount_quotas: Superblock update failed!");
		}
	}

	if (error) {
		xfs_fs_cmn_err(CE_WARN, mp,
			"Failed to initialize disk quotas.");
	}
	return XFS_ERROR(error);
}

/*
 * Called from the vfsops layer.
 */
int
xfs_qm_unmount_quotas(
	xfs_mount_t	*mp)
{
	xfs_inode_t	*uqp, *gqp;
	int		error = 0;

	/*
	 * Release the dquots that root inode, et al might be holding,
	 * before we flush quotas and blow away the quotainfo structure.
	 */
	ASSERT(mp->m_rootip);
	xfs_qm_dqdetach(mp->m_rootip);
	if (mp->m_rbmip)
		xfs_qm_dqdetach(mp->m_rbmip);
	if (mp->m_rsumip)
		xfs_qm_dqdetach(mp->m_rsumip);

	/*
	 * Flush out the quota inodes.
	 */
	uqp = gqp = NULL;
	if (mp->m_quotainfo) {
		if ((uqp = mp->m_quotainfo->qi_uquotaip) != NULL) {
			xfs_ilock(uqp, XFS_ILOCK_EXCL);
			xfs_iflock(uqp);
			error = xfs_iflush(uqp, XFS_IFLUSH_SYNC);
			xfs_iunlock(uqp, XFS_ILOCK_EXCL);
			if (unlikely(error == EFSCORRUPTED)) {
				XFS_ERROR_REPORT("xfs_qm_unmount_quotas(1)",
						 XFS_ERRLEVEL_LOW, mp);
				goto out;
			}
		}
		if ((gqp = mp->m_quotainfo->qi_gquotaip) != NULL) {
			xfs_ilock(gqp, XFS_ILOCK_EXCL);
			xfs_iflock(gqp);
			error = xfs_iflush(gqp, XFS_IFLUSH_SYNC);
			xfs_iunlock(gqp, XFS_ILOCK_EXCL);
			if (unlikely(error == EFSCORRUPTED)) {
				XFS_ERROR_REPORT("xfs_qm_unmount_quotas(2)",
						 XFS_ERRLEVEL_LOW, mp);
				goto out;
			}
		}
	}
	if (uqp) {
		 XFS_PURGE_INODE(uqp);
		 mp->m_quotainfo->qi_uquotaip = NULL;
	}
	if (gqp) {
		XFS_PURGE_INODE(gqp);
		mp->m_quotainfo->qi_gquotaip = NULL;
	}
out:
	return XFS_ERROR(error);
}

/*
 * Flush all dquots of the given file system to disk. The dquots are
 * _not_ purged from memory here, just their data written to disk.
 */
492
STATIC int
Linus Torvalds's avatar
Linus Torvalds committed
493 494 495 496 497 498 499 500 501 502
xfs_qm_dqflush_all(
	xfs_mount_t	*mp,
	int		flags)
{
	int		recl;
	xfs_dquot_t	*dqp;
	int		niters;
	int		error;

	if (mp->m_quotainfo == NULL)
503
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533
	niters = 0;
again:
	xfs_qm_mplist_lock(mp);
	FOREACH_DQUOT_IN_MP(dqp, mp) {
		xfs_dqlock(dqp);
		if (! XFS_DQ_IS_DIRTY(dqp)) {
			xfs_dqunlock(dqp);
			continue;
		}
		xfs_dqtrace_entry(dqp, "FLUSHALL: DQDIRTY");
		/* XXX a sentinel would be better */
		recl = XFS_QI_MPLRECLAIMS(mp);
		if (! xfs_qm_dqflock_nowait(dqp)) {
			/*
			 * If we can't grab the flush lock then check
			 * to see if the dquot has been flushed delayed
			 * write.  If so, grab its buffer and send it
			 * out immediately.  We'll be able to acquire
			 * the flush lock when the I/O completes.
			 */
			xfs_qm_dqflock_pushbuf_wait(dqp);
		}
		/*
		 * Let go of the mplist lock. We don't want to hold it
		 * across a disk write.
		 */
		xfs_qm_mplist_unlock(mp);
		error = xfs_qm_dqflush(dqp, flags);
		xfs_dqunlock(dqp);
		if (error)
534
			return error;
Linus Torvalds's avatar
Linus Torvalds committed
535 536 537 538 539 540 541 542 543 544 545

		xfs_qm_mplist_lock(mp);
		if (recl != XFS_QI_MPLRECLAIMS(mp)) {
			xfs_qm_mplist_unlock(mp);
			/* XXX restart limit */
			goto again;
		}
	}

	xfs_qm_mplist_unlock(mp);
	/* return ! busy */
546
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595
}
/*
 * Release the group dquot pointers the user dquots may be
 * carrying around as a hint. mplist is locked on entry and exit.
 */
STATIC void
xfs_qm_detach_gdquots(
	xfs_mount_t	*mp)
{
	xfs_dquot_t	*dqp, *gdqp;
	int		nrecl;

 again:
	ASSERT(XFS_QM_IS_MPLIST_LOCKED(mp));
	dqp = XFS_QI_MPLNEXT(mp);
	while (dqp) {
		xfs_dqlock(dqp);
		if ((gdqp = dqp->q_gdquot)) {
			xfs_dqlock(gdqp);
			dqp->q_gdquot = NULL;
		}
		xfs_dqunlock(dqp);

		if (gdqp) {
			/*
			 * Can't hold the mplist lock across a dqput.
			 * XXXmust convert to marker based iterations here.
			 */
			nrecl = XFS_QI_MPLRECLAIMS(mp);
			xfs_qm_mplist_unlock(mp);
			xfs_qm_dqput(gdqp);

			xfs_qm_mplist_lock(mp);
			if (nrecl != XFS_QI_MPLRECLAIMS(mp))
				goto again;
		}
		dqp = dqp->MPL_NEXT;
	}
}

/*
 * Go through all the incore dquots of this file system and take them
 * off the mplist and hashlist, if the dquot type matches the dqtype
 * parameter. This is used when turning off quota accounting for
 * users and/or groups, as well as when the filesystem is unmounting.
 */
STATIC int
xfs_qm_dqpurge_int(
	xfs_mount_t	*mp,
596
	uint		flags) /* QUOTAOFF/UMOUNTING/UQUOTA/PQUOTA/GQUOTA */
Linus Torvalds's avatar
Linus Torvalds committed
597 598 599 600 601 602 603 604
{
	xfs_dquot_t	*dqp;
	uint		dqtype;
	int		nrecl;
	xfs_dquot_t	*nextdqp;
	int		nmisses;

	if (mp->m_quotainfo == NULL)
605
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
606 607

	dqtype = (flags & XFS_QMOPT_UQUOTA) ? XFS_DQ_USER : 0;
608
	dqtype |= (flags & XFS_QMOPT_PQUOTA) ? XFS_DQ_PROJ : 0;
Linus Torvalds's avatar
Linus Torvalds committed
609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717
	dqtype |= (flags & XFS_QMOPT_GQUOTA) ? XFS_DQ_GROUP : 0;

	xfs_qm_mplist_lock(mp);

	/*
	 * In the first pass through all incore dquots of this filesystem,
	 * we release the group dquot pointers the user dquots may be
	 * carrying around as a hint. We need to do this irrespective of
	 * what's being turned off.
	 */
	xfs_qm_detach_gdquots(mp);

      again:
	nmisses = 0;
	ASSERT(XFS_QM_IS_MPLIST_LOCKED(mp));
	/*
	 * Try to get rid of all of the unwanted dquots. The idea is to
	 * get them off mplist and hashlist, but leave them on freelist.
	 */
	dqp = XFS_QI_MPLNEXT(mp);
	while (dqp) {
		/*
		 * It's OK to look at the type without taking dqlock here.
		 * We're holding the mplist lock here, and that's needed for
		 * a dqreclaim.
		 */
		if ((dqp->dq_flags & dqtype) == 0) {
			dqp = dqp->MPL_NEXT;
			continue;
		}

		if (! xfs_qm_dqhashlock_nowait(dqp)) {
			nrecl = XFS_QI_MPLRECLAIMS(mp);
			xfs_qm_mplist_unlock(mp);
			XFS_DQ_HASH_LOCK(dqp->q_hash);
			xfs_qm_mplist_lock(mp);

			/*
			 * XXXTheoretically, we can get into a very long
			 * ping pong game here.
			 * No one can be adding dquots to the mplist at
			 * this point, but somebody might be taking things off.
			 */
			if (nrecl != XFS_QI_MPLRECLAIMS(mp)) {
				XFS_DQ_HASH_UNLOCK(dqp->q_hash);
				goto again;
			}
		}

		/*
		 * Take the dquot off the mplist and hashlist. It may remain on
		 * freelist in INACTIVE state.
		 */
		nextdqp = dqp->MPL_NEXT;
		nmisses += xfs_qm_dqpurge(dqp, flags);
		dqp = nextdqp;
	}
	xfs_qm_mplist_unlock(mp);
	return nmisses;
}

int
xfs_qm_dqpurge_all(
	xfs_mount_t	*mp,
	uint		flags)
{
	int		ndquots;

	/*
	 * Purge the dquot cache.
	 * None of the dquots should really be busy at this point.
	 */
	if (mp->m_quotainfo) {
		while ((ndquots = xfs_qm_dqpurge_int(mp, flags))) {
			delay(ndquots * 10);
		}
	}
	return 0;
}

STATIC int
xfs_qm_dqattach_one(
	xfs_inode_t	*ip,
	xfs_dqid_t	id,
	uint		type,
	uint		doalloc,
	uint		dolock,
	xfs_dquot_t	*udqhint, /* hint */
	xfs_dquot_t	**IO_idqpp)
{
	xfs_dquot_t	*dqp;
	int		error;

	ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
	error = 0;
	/*
	 * See if we already have it in the inode itself. IO_idqpp is
	 * &i_udquot or &i_gdquot. This made the code look weird, but
	 * made the logic a lot simpler.
	 */
	if ((dqp = *IO_idqpp)) {
		if (dolock)
			xfs_dqlock(dqp);
		xfs_dqtrace_entry(dqp, "DQATTACH: found in ip");
		goto done;
	}

	/*
	 * udqhint is the i_udquot field in inode, and is non-NULL only
718
	 * when the type arg is group/project. Its purpose is to save a
Linus Torvalds's avatar
Linus Torvalds committed
719 720 721
	 * lookup by dqid (xfs_qm_dqget) by caching a group dquot inside
	 * the user dquot.
	 */
722
	ASSERT(!udqhint || type == XFS_DQ_GROUP || type == XFS_DQ_PROJ);
Linus Torvalds's avatar
Linus Torvalds committed
723 724 725 726 727 728 729 730 731 732 733
	if (udqhint && !dolock)
		xfs_dqlock(udqhint);

	/*
	 * No need to take dqlock to look at the id.
	 * The ID can't change until it gets reclaimed, and it won't
	 * be reclaimed as long as we have a ref from inode and we hold
	 * the ilock.
	 */
	if (udqhint &&
	    (dqp = udqhint->q_gdquot) &&
734
	    (be32_to_cpu(dqp->q_core.d_id) == id)) {
Linus Torvalds's avatar
Linus Torvalds committed
735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
		ASSERT(XFS_DQ_IS_LOCKED(udqhint));
		xfs_dqlock(dqp);
		XFS_DQHOLD(dqp);
		ASSERT(*IO_idqpp == NULL);
		*IO_idqpp = dqp;
		if (!dolock) {
			xfs_dqunlock(dqp);
			xfs_dqunlock(udqhint);
		}
		goto done;
	}
	/*
	 * We can't hold a dquot lock when we call the dqget code.
	 * We'll deadlock in no time, because of (not conforming to)
	 * lock ordering - the inodelock comes before any dquot lock,
	 * and we may drop and reacquire the ilock in xfs_qm_dqget().
	 */
	if (udqhint)
		xfs_dqunlock(udqhint);
	/*
	 * Find the dquot from somewhere. This bumps the
	 * reference count of dquot and returns it locked.
	 * This can return ENOENT if dquot didn't exist on
	 * disk and we didn't ask it to allocate;
	 * ESRCH if quotas got turned off suddenly.
	 */
	if ((error = xfs_qm_dqget(ip->i_mount, ip, id, type,
				 doalloc|XFS_QMOPT_DOWARN, &dqp))) {
		if (udqhint && dolock)
			xfs_dqlock(udqhint);
		goto done;
	}

	xfs_dqtrace_entry(dqp, "DQATTACH: found by dqget");
	/*
	 * dqget may have dropped and re-acquired the ilock, but it guarantees
	 * that the dquot returned is the one that should go in the inode.
	 */
	*IO_idqpp = dqp;
	ASSERT(dqp);
	ASSERT(XFS_DQ_IS_LOCKED(dqp));
	if (! dolock) {
		xfs_dqunlock(dqp);
		goto done;
	}
	if (! udqhint)
		goto done;

	ASSERT(udqhint);
	ASSERT(dolock);
	ASSERT(XFS_DQ_IS_LOCKED(dqp));
	if (! xfs_qm_dqlock_nowait(udqhint)) {
		xfs_dqunlock(dqp);
		xfs_dqlock(udqhint);
		xfs_dqlock(dqp);
	}
      done:
#ifdef QUOTADEBUG
	if (udqhint) {
		if (dolock)
			ASSERT(XFS_DQ_IS_LOCKED(udqhint));
	}
	if (! error) {
		if (dolock)
			ASSERT(XFS_DQ_IS_LOCKED(dqp));
	}
#endif
802
	return error;
Linus Torvalds's avatar
Linus Torvalds committed
803 804 805 806 807 808 809
}


/*
 * Given a udquot and gdquot, attach a ptr to the group dquot in the
 * udquot as a hint for future lookups. The idea sounds simple, but the
 * execution isn't, because the udquot might have a group dquot attached
810
 * already and getting rid of that gets us into lock ordering constraints.
Linus Torvalds's avatar
Linus Torvalds committed
811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880
 * The process is complicated more by the fact that the dquots may or may not
 * be locked on entry.
 */
STATIC void
xfs_qm_dqattach_grouphint(
	xfs_dquot_t	*udq,
	xfs_dquot_t	*gdq,
	uint		locked)
{
	xfs_dquot_t	*tmp;

#ifdef QUOTADEBUG
	if (locked) {
		ASSERT(XFS_DQ_IS_LOCKED(udq));
		ASSERT(XFS_DQ_IS_LOCKED(gdq));
	}
#endif
	if (! locked)
		xfs_dqlock(udq);

	if ((tmp = udq->q_gdquot)) {
		if (tmp == gdq) {
			if (! locked)
				xfs_dqunlock(udq);
			return;
		}

		udq->q_gdquot = NULL;
		/*
		 * We can't keep any dqlocks when calling dqrele,
		 * because the freelist lock comes before dqlocks.
		 */
		xfs_dqunlock(udq);
		if (locked)
			xfs_dqunlock(gdq);
		/*
		 * we took a hard reference once upon a time in dqget,
		 * so give it back when the udquot no longer points at it
		 * dqput() does the unlocking of the dquot.
		 */
		xfs_qm_dqrele(tmp);

		xfs_dqlock(udq);
		xfs_dqlock(gdq);

	} else {
		ASSERT(XFS_DQ_IS_LOCKED(udq));
		if (! locked) {
			xfs_dqlock(gdq);
		}
	}

	ASSERT(XFS_DQ_IS_LOCKED(udq));
	ASSERT(XFS_DQ_IS_LOCKED(gdq));
	/*
	 * Somebody could have attached a gdquot here,
	 * when we dropped the uqlock. If so, just do nothing.
	 */
	if (udq->q_gdquot == NULL) {
		XFS_DQHOLD(gdq);
		udq->q_gdquot = gdq;
	}
	if (! locked) {
		xfs_dqunlock(gdq);
		xfs_dqunlock(udq);
	}
}


/*
881 882
 * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 * into account.
Linus Torvalds's avatar
Linus Torvalds committed
883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902
 * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 * If XFS_QMOPT_DQLOCK, the dquot(s) will be returned locked. This option pretty
 * much made this code a complete mess, but it has been pretty useful.
 * If XFS_QMOPT_ILOCKED, then inode sent is already locked EXCL.
 * Inode may get unlocked and relocked in here, and the caller must deal with
 * the consequences.
 */
int
xfs_qm_dqattach(
	xfs_inode_t	*ip,
	uint		flags)
{
	xfs_mount_t	*mp = ip->i_mount;
	uint		nquotas = 0;
	int		error = 0;

	if ((! XFS_IS_QUOTA_ON(mp)) ||
	    (! XFS_NOT_DQATTACHED(mp, ip)) ||
	    (ip->i_ino == mp->m_sb.sb_uquotino) ||
	    (ip->i_ino == mp->m_sb.sb_gquotino))
903
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920

	ASSERT((flags & XFS_QMOPT_ILOCKED) == 0 ||
	       XFS_ISLOCKED_INODE_EXCL(ip));

	if (! (flags & XFS_QMOPT_ILOCKED))
		xfs_ilock(ip, XFS_ILOCK_EXCL);

	if (XFS_IS_UQUOTA_ON(mp)) {
		error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
						flags & XFS_QMOPT_DQALLOC,
						flags & XFS_QMOPT_DQLOCK,
						NULL, &ip->i_udquot);
		if (error)
			goto done;
		nquotas++;
	}
	ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
921 922 923 924 925 926 927
	if (XFS_IS_OQUOTA_ON(mp)) {
		error = XFS_IS_GQUOTA_ON(mp) ?
			xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
						flags & XFS_QMOPT_DQALLOC,
						flags & XFS_QMOPT_DQLOCK,
						ip->i_udquot, &ip->i_gdquot) :
			xfs_qm_dqattach_one(ip, ip->i_d.di_projid, XFS_DQ_PROJ,
Linus Torvalds's avatar
Linus Torvalds committed
928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977
						flags & XFS_QMOPT_DQALLOC,
						flags & XFS_QMOPT_DQLOCK,
						ip->i_udquot, &ip->i_gdquot);
		/*
		 * Don't worry about the udquot that we may have
		 * attached above. It'll get detached, if not already.
		 */
		if (error)
			goto done;
		nquotas++;
	}

	/*
	 * Attach this group quota to the user quota as a hint.
	 * This WON'T, in general, result in a thrash.
	 */
	if (nquotas == 2) {
		ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
		ASSERT(ip->i_udquot);
		ASSERT(ip->i_gdquot);

		/*
		 * We may or may not have the i_udquot locked at this point,
		 * but this check is OK since we don't depend on the i_gdquot to
		 * be accurate 100% all the time. It is just a hint, and this
		 * will succeed in general.
		 */
		if (ip->i_udquot->q_gdquot == ip->i_gdquot)
			goto done;
		/*
		 * Attach i_gdquot to the gdquot hint inside the i_udquot.
		 */
		xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot,
					 flags & XFS_QMOPT_DQLOCK);
	}

      done:

#ifdef QUOTADEBUG
	if (! error) {
		if (ip->i_udquot) {
			if (flags & XFS_QMOPT_DQLOCK)
				ASSERT(XFS_DQ_IS_LOCKED(ip->i_udquot));
		}
		if (ip->i_gdquot) {
			if (flags & XFS_QMOPT_DQLOCK)
				ASSERT(XFS_DQ_IS_LOCKED(ip->i_gdquot));
		}
		if (XFS_IS_UQUOTA_ON(mp))
			ASSERT(ip->i_udquot);
978
		if (XFS_IS_OQUOTA_ON(mp))
Linus Torvalds's avatar
Linus Torvalds committed
979 980 981 982 983 984 985 986 987 988 989
			ASSERT(ip->i_gdquot);
	}
#endif

	if (! (flags & XFS_QMOPT_ILOCKED))
		xfs_iunlock(ip, XFS_ILOCK_EXCL);

#ifdef QUOTADEBUG
	else
		ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
#endif
990
	return error;
Linus Torvalds's avatar
Linus Torvalds committed
991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
}

/*
 * Release dquots (and their references) if any.
 * The inode should be locked EXCL except when this's called by
 * xfs_ireclaim.
 */
void
xfs_qm_dqdetach(
	xfs_inode_t	*ip)
{
	if (!(ip->i_udquot || ip->i_gdquot))
		return;

	ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_uquotino);
	ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_gquotino);
	if (ip->i_udquot) {
1008
		xfs_dqtrace_entry_ino(ip->i_udquot, "DQDETTACH", ip);
Linus Torvalds's avatar
Linus Torvalds committed
1009 1010 1011 1012
		xfs_qm_dqrele(ip->i_udquot);
		ip->i_udquot = NULL;
	}
	if (ip->i_gdquot) {
1013
		xfs_dqtrace_entry_ino(ip->i_gdquot, "DQDETTACH", ip);
Linus Torvalds's avatar
Linus Torvalds committed
1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
		xfs_qm_dqrele(ip->i_gdquot);
		ip->i_gdquot = NULL;
	}
}

/*
 * This is called by VFS_SYNC and flags arg determines the caller,
 * and its motives, as done in xfs_sync.
 *
 * vfs_sync: SYNC_FSDATA|SYNC_ATTR|SYNC_BDFLUSH 0x31
 * syscall sync: SYNC_FSDATA|SYNC_ATTR|SYNC_DELWRI 0x25
 * umountroot : SYNC_WAIT | SYNC_CLOSE | SYNC_ATTR | SYNC_FSDATA
 */

int
xfs_qm_sync(
	xfs_mount_t	*mp,
	short		flags)
{
	int		recl, restarts;
	xfs_dquot_t	*dqp;
	uint		flush_flags;
	boolean_t	nowait;
	int		error;

	restarts = 0;
	/*
	 * We won't block unless we are asked to.
	 */
	nowait = (boolean_t)(flags & SYNC_BDFLUSH || (flags & SYNC_WAIT) == 0);

  again:
	xfs_qm_mplist_lock(mp);
	/*
	 * dqpurge_all() also takes the mplist lock and iterate thru all dquots
	 * in quotaoff. However, if the QUOTA_ACTIVE bits are not cleared
	 * when we have the mplist lock, we know that dquots will be consistent
	 * as long as we have it locked.
	 */
	if (! XFS_IS_QUOTA_ON(mp)) {
		xfs_qm_mplist_unlock(mp);
1055
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096
	}
	FOREACH_DQUOT_IN_MP(dqp, mp) {
		/*
		 * If this is vfs_sync calling, then skip the dquots that
		 * don't 'seem' to be dirty. ie. don't acquire dqlock.
		 * This is very similar to what xfs_sync does with inodes.
		 */
		if (flags & SYNC_BDFLUSH) {
			if (! XFS_DQ_IS_DIRTY(dqp))
				continue;
		}

		if (nowait) {
			/*
			 * Try to acquire the dquot lock. We are NOT out of
			 * lock order, but we just don't want to wait for this
			 * lock, unless somebody wanted us to.
			 */
			if (! xfs_qm_dqlock_nowait(dqp))
				continue;
		} else {
			xfs_dqlock(dqp);
		}

		/*
		 * Now, find out for sure if this dquot is dirty or not.
		 */
		if (! XFS_DQ_IS_DIRTY(dqp)) {
			xfs_dqunlock(dqp);
			continue;
		}

		/* XXX a sentinel would be better */
		recl = XFS_QI_MPLRECLAIMS(mp);
		if (! xfs_qm_dqflock_nowait(dqp)) {
			if (nowait) {
				xfs_dqunlock(dqp);
				continue;
			}
			/*
			 * If we can't grab the flush lock then if the caller
1097
			 * really wanted us to give this our best shot, so
Linus Torvalds's avatar
Linus Torvalds committed
1098 1099
			 * see if we can give a push to the buffer before we wait
			 * on the flush lock. At this point, we know that
1100
			 * even though the dquot is being flushed,
Linus Torvalds's avatar
Linus Torvalds committed
1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
			 * it has (new) dirty data.
			 */
			xfs_qm_dqflock_pushbuf_wait(dqp);
		}
		/*
		 * Let go of the mplist lock. We don't want to hold it
		 * across a disk write
		 */
		flush_flags = (nowait) ? XFS_QMOPT_DELWRI : XFS_QMOPT_SYNC;
		xfs_qm_mplist_unlock(mp);
		xfs_dqtrace_entry(dqp, "XQM_SYNC: DQFLUSH");
		error = xfs_qm_dqflush(dqp, flush_flags);
		xfs_dqunlock(dqp);
		if (error && XFS_FORCED_SHUTDOWN(mp))
1115
			return 0;	/* Need to prevent umount failure */
Linus Torvalds's avatar
Linus Torvalds committed
1116
		else if (error)
1117
			return error;
Linus Torvalds's avatar
Linus Torvalds committed
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129

		xfs_qm_mplist_lock(mp);
		if (recl != XFS_QI_MPLRECLAIMS(mp)) {
			if (++restarts >= XFS_QM_SYNC_MAX_RESTARTS)
				break;

			xfs_qm_mplist_unlock(mp);
			goto again;
		}
	}

	xfs_qm_mplist_unlock(mp);
1130
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
1131 1132 1133 1134 1135 1136 1137
}


/*
 * This initializes all the quota information that's kept in the
 * mount structure
 */
1138
STATIC int
Linus Torvalds's avatar
Linus Torvalds committed
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
xfs_qm_init_quotainfo(
	xfs_mount_t	*mp)
{
	xfs_quotainfo_t *qinf;
	int		error;
	xfs_dquot_t	*dqp;

	ASSERT(XFS_IS_QUOTA_RUNNING(mp));

	/*
	 * Tell XQM that we exist as soon as possible.
	 */
	if ((error = xfs_qm_hold_quotafs_ref(mp))) {
1152
		return error;
Linus Torvalds's avatar
Linus Torvalds committed
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163
	}

	qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);

	/*
	 * See if quotainodes are setup, and if not, allocate them,
	 * and change the superblock accordingly.
	 */
	if ((error = xfs_qm_init_quotainos(mp))) {
		kmem_free(qinf, sizeof(xfs_quotainfo_t));
		mp->m_quotainfo = NULL;
1164
		return error;
Linus Torvalds's avatar
Linus Torvalds committed
1165 1166 1167 1168 1169 1170 1171
	}

	spinlock_init(&qinf->qi_pinlock, "xfs_qinf_pin");
	xfs_qm_list_init(&qinf->qi_dqlist, "mpdqlist", 0);
	qinf->qi_dqreclaims = 0;

	/* mutex used to serialize quotaoffs */
1172
	mutex_init(&qinf->qi_quotaofflock);
Linus Torvalds's avatar
Linus Torvalds committed
1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190

	/* Precalc some constants */
	qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
	ASSERT(qinf->qi_dqchunklen);
	qinf->qi_dqperchunk = BBTOB(qinf->qi_dqchunklen);
	do_div(qinf->qi_dqperchunk, sizeof(xfs_dqblk_t));

	mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);

	/*
	 * We try to get the limits from the superuser's limits fields.
	 * This is quite hacky, but it is standard quota practice.
	 * We look at the USR dquot with id == 0 first, but if user quotas
	 * are not enabled we goto the GRP dquot with id == 0.
	 * We don't really care to keep separate default limits for user
	 * and group quotas, at least not at this point.
	 */
	error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)0,
1191 1192 1193
			     XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER : 
			     (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
				XFS_DQ_PROJ),
Linus Torvalds's avatar
Linus Torvalds committed
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203
			     XFS_QMOPT_DQSUSER|XFS_QMOPT_DOWARN,
			     &dqp);
	if (! error) {
		xfs_disk_dquot_t	*ddqp = &dqp->q_core;

		/*
		 * The warnings and timers set the grace period given to
		 * a user or group before he or she can not perform any
		 * more writing. If it is zero, a default is used.
		 */
1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221
		qinf->qi_btimelimit = ddqp->d_btimer ?
			be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
		qinf->qi_itimelimit = ddqp->d_itimer ?
			be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
		qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
			be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
		qinf->qi_bwarnlimit = ddqp->d_bwarns ?
			be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
		qinf->qi_iwarnlimit = ddqp->d_iwarns ?
			be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
		qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
			be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
		qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
		qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
		qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
		qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
		qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
		qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
Linus Torvalds's avatar
Linus Torvalds committed
1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
 
		/*
		 * We sent the XFS_QMOPT_DQSUSER flag to dqget because
		 * we don't want this dquot cached. We haven't done a
		 * quotacheck yet, and quotacheck doesn't like incore dquots.
		 */
		xfs_qm_dqdestroy(dqp);
	} else {
		qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
		qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
		qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
		qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
		qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
1235
		qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
Linus Torvalds's avatar
Linus Torvalds committed
1236 1237
	}

1238
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290
}


/*
 * Gets called when unmounting a filesystem or when all quotas get
 * turned off.
 * This purges the quota inodes, destroys locks and frees itself.
 */
void
xfs_qm_destroy_quotainfo(
	xfs_mount_t	*mp)
{
	xfs_quotainfo_t *qi;

	qi = mp->m_quotainfo;
	ASSERT(qi != NULL);
	ASSERT(xfs_Gqm != NULL);

	/*
	 * Release the reference that XQM kept, so that we know
	 * when the XQM structure should be freed. We cannot assume
	 * that xfs_Gqm is non-null after this point.
	 */
	xfs_qm_rele_quotafs_ref(mp);

	spinlock_destroy(&qi->qi_pinlock);
	xfs_qm_list_destroy(&qi->qi_dqlist);

	if (qi->qi_uquotaip) {
		XFS_PURGE_INODE(qi->qi_uquotaip);
		qi->qi_uquotaip = NULL; /* paranoia */
	}
	if (qi->qi_gquotaip) {
		XFS_PURGE_INODE(qi->qi_gquotaip);
		qi->qi_gquotaip = NULL;
	}
	mutex_destroy(&qi->qi_quotaofflock);
	kmem_free(qi, sizeof(xfs_quotainfo_t));
	mp->m_quotainfo = NULL;
}



/* ------------------- PRIVATE STATIC FUNCTIONS ----------------------- */

/* ARGSUSED */
STATIC void
xfs_qm_list_init(
	xfs_dqlist_t	*list,
	char		*str,
	int		n)
{
1291
	mutex_init(&list->qh_lock);
Linus Torvalds's avatar
Linus Torvalds committed
1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337
	list->qh_next = NULL;
	list->qh_version = 0;
	list->qh_nelems = 0;
}

STATIC void
xfs_qm_list_destroy(
	xfs_dqlist_t	*list)
{
	mutex_destroy(&(list->qh_lock));
}


/*
 * Stripped down version of dqattach. This doesn't attach, or even look at the
 * dquots attached to the inode. The rationale is that there won't be any
 * attached at the time this is called from quotacheck.
 */
STATIC int
xfs_qm_dqget_noattach(
	xfs_inode_t	*ip,
	xfs_dquot_t	**O_udqpp,
	xfs_dquot_t	**O_gdqpp)
{
	int		error;
	xfs_mount_t	*mp;
	xfs_dquot_t	*udqp, *gdqp;

	ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
	mp = ip->i_mount;
	udqp = NULL;
	gdqp = NULL;

	if (XFS_IS_UQUOTA_ON(mp)) {
		ASSERT(ip->i_udquot == NULL);
		/*
		 * We want the dquot allocated if it doesn't exist.
		 */
		if ((error = xfs_qm_dqget(mp, ip, ip->i_d.di_uid, XFS_DQ_USER,
					 XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN,
					 &udqp))) {
			/*
			 * Shouldn't be able to turn off quotas here.
			 */
			ASSERT(error != ESRCH);
			ASSERT(error != ENOENT);
1338
			return error;
Linus Torvalds's avatar
Linus Torvalds committed
1339 1340 1341 1342
		}
		ASSERT(udqp);
	}

1343
	if (XFS_IS_OQUOTA_ON(mp)) {
Linus Torvalds's avatar
Linus Torvalds committed
1344 1345 1346
		ASSERT(ip->i_gdquot == NULL);
		if (udqp)
			xfs_dqunlock(udqp);
1347 1348 1349 1350 1351 1352 1353 1354 1355 1356
		error = XFS_IS_GQUOTA_ON(mp) ?
				xfs_qm_dqget(mp, ip,
					     ip->i_d.di_gid, XFS_DQ_GROUP,
					     XFS_QMOPT_DQALLOC|XFS_QMOPT_DOWARN,
					     &gdqp) :
				xfs_qm_dqget(mp, ip,
					     ip->i_d.di_projid, XFS_DQ_PROJ,
					     XFS_QMOPT_DQALLOC|XFS_QMOPT_DOWARN,
					     &gdqp);
		if (error) {
Linus Torvalds's avatar
Linus Torvalds committed
1357 1358 1359 1360
			if (udqp)
				xfs_qm_dqrele(udqp);
			ASSERT(error != ESRCH);
			ASSERT(error != ENOENT);
1361
			return error;
Linus Torvalds's avatar
Linus Torvalds committed
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381
		}
		ASSERT(gdqp);

		/* Reacquire the locks in the right order */
		if (udqp) {
			if (! xfs_qm_dqlock_nowait(udqp)) {
				xfs_dqunlock(gdqp);
				xfs_dqlock(udqp);
				xfs_dqlock(gdqp);
			}
		}
	}

	*O_udqpp = udqp;
	*O_gdqpp = gdqp;

#ifdef QUOTADEBUG
	if (udqp) ASSERT(XFS_DQ_IS_LOCKED(udqp));
	if (gdqp) ASSERT(XFS_DQ_IS_LOCKED(gdqp));
#endif
1382
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397
}

/*
 * Create an inode and return with a reference already taken, but unlocked
 * This is how we create quota inodes
 */
STATIC int
xfs_qm_qino_alloc(
	xfs_mount_t	*mp,
	xfs_inode_t	**ip,
	__int64_t	sbfields,
	uint		flags)
{
	xfs_trans_t	*tp;
	int		error;
1398
	unsigned long	s;
Linus Torvalds's avatar
Linus Torvalds committed
1399 1400
	int		committed;

1401
	tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
Linus Torvalds's avatar
Linus Torvalds committed
1402 1403 1404 1405 1406 1407
	if ((error = xfs_trans_reserve(tp,
				      XFS_QM_QINOCREATE_SPACE_RES(mp),
				      XFS_CREATE_LOG_RES(mp), 0,
				      XFS_TRANS_PERM_LOG_RES,
				      XFS_CREATE_LOG_COUNT))) {
		xfs_trans_cancel(tp, 0);
1408
		return error;
Linus Torvalds's avatar
Linus Torvalds committed
1409 1410
	}

1411 1412
	if ((error = xfs_dir_ialloc(&tp, &xfs_zeroino, S_IFREG, 1, 0,
				   &xfs_zerocr, 0, 1, ip, &committed))) {
Linus Torvalds's avatar
Linus Torvalds committed
1413 1414
		xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
				 XFS_TRANS_ABORT);
1415
		return error;
Linus Torvalds's avatar
Linus Torvalds committed
1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462
	}

	/*
	 * Keep an extra reference to this quota inode. This inode is
	 * locked exclusively and joined to the transaction already.
	 */
	ASSERT(XFS_ISLOCKED_INODE_EXCL(*ip));
	VN_HOLD(XFS_ITOV((*ip)));

	/*
	 * Make the changes in the superblock, and log those too.
	 * sbfields arg may contain fields other than *QUOTINO;
	 * VERSIONNUM for example.
	 */
	s = XFS_SB_LOCK(mp);
	if (flags & XFS_QMOPT_SBVERSION) {
#if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
		unsigned oldv = mp->m_sb.sb_versionnum;
#endif
		ASSERT(!XFS_SB_VERSION_HASQUOTA(&mp->m_sb));
		ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
				   XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
		       (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
			XFS_SB_GQUOTINO | XFS_SB_QFLAGS));

		XFS_SB_VERSION_ADDQUOTA(&mp->m_sb);
		mp->m_sb.sb_uquotino = NULLFSINO;
		mp->m_sb.sb_gquotino = NULLFSINO;

		/* qflags will get updated _after_ quotacheck */
		mp->m_sb.sb_qflags = 0;
#if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
		cmn_err(CE_NOTE,
			"Old superblock version %x, converting to %x.",
			oldv, mp->m_sb.sb_versionnum);
#endif
	}
	if (flags & XFS_QMOPT_UQUOTA)
		mp->m_sb.sb_uquotino = (*ip)->i_ino;
	else
		mp->m_sb.sb_gquotino = (*ip)->i_ino;
	XFS_SB_UNLOCK(mp, s);
	xfs_mod_sb(tp, sbfields);

	if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES,
				     NULL))) {
		xfs_fs_cmn_err(CE_ALERT, mp, "XFS qino_alloc failed!");
1463
		return error;
Linus Torvalds's avatar
Linus Torvalds committed
1464
	}
1465
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493
}


STATIC int
xfs_qm_reset_dqcounts(
	xfs_mount_t	*mp,
	xfs_buf_t	*bp,
	xfs_dqid_t	id,
	uint		type)
{
	xfs_disk_dquot_t	*ddq;
	int			j;

	xfs_buftrace("RESET DQUOTS", bp);
	/*
	 * Reset all counters and timers. They'll be
	 * started afresh by xfs_qm_quotacheck.
	 */
#ifdef DEBUG
	j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
	do_div(j, sizeof(xfs_dqblk_t));
	ASSERT(XFS_QM_DQPERBLK(mp) == j);
#endif
	ddq = (xfs_disk_dquot_t *)XFS_BUF_PTR(bp);
	for (j = 0; j < XFS_QM_DQPERBLK(mp); j++) {
		/*
		 * Do a sanity check, and if needed, repair the dqblk. Don't
		 * output any warnings because it's perfectly possible to
1494
		 * find uninitialised dquot blks. See comment in xfs_qm_dqcheck.
Linus Torvalds's avatar
Linus Torvalds committed
1495 1496 1497
		 */
		(void) xfs_qm_dqcheck(ddq, id+j, type, XFS_QMOPT_DQREPAIR,
				      "xfs_quotacheck");
1498 1499 1500 1501 1502 1503 1504 1505 1506
		ddq->d_bcount = 0;
		ddq->d_icount = 0;
		ddq->d_rtbcount = 0;
		ddq->d_btimer = 0;
		ddq->d_itimer = 0;
		ddq->d_rtbtimer = 0;
		ddq->d_bwarns = 0;
		ddq->d_iwarns = 0;
		ddq->d_rtbwarns = 0;
Linus Torvalds's avatar
Linus Torvalds committed
1507 1508 1509
		ddq = (xfs_disk_dquot_t *) ((xfs_dqblk_t *)ddq + 1);
	}

1510
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
}

STATIC int
xfs_qm_dqiter_bufs(
	xfs_mount_t	*mp,
	xfs_dqid_t	firstid,
	xfs_fsblock_t	bno,
	xfs_filblks_t	blkcnt,
	uint		flags)
{
	xfs_buf_t	*bp;
	int		error;
	int		notcommitted;
	int		incr;
1525
	int		type;
Linus Torvalds's avatar
Linus Torvalds committed
1526 1527 1528 1529 1530

	ASSERT(blkcnt > 0);
	notcommitted = 0;
	incr = (blkcnt > XFS_QM_MAX_DQCLUSTER_LOGSZ) ?
		XFS_QM_MAX_DQCLUSTER_LOGSZ : blkcnt;
1531 1532
	type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
		(flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
Linus Torvalds's avatar
Linus Torvalds committed
1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550
	error = 0;

	/*
	 * Blkcnt arg can be a very big number, and might even be
	 * larger than the log itself. So, we have to break it up into
	 * manageable-sized transactions.
	 * Note that we don't start a permanent transaction here; we might
	 * not be able to get a log reservation for the whole thing up front,
	 * and we don't really care to either, because we just discard
	 * everything if we were to crash in the middle of this loop.
	 */
	while (blkcnt--) {
		error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
			      XFS_FSB_TO_DADDR(mp, bno),
			      (int)XFS_QI_DQCHUNKLEN(mp), 0, &bp);
		if (error)
			break;

1551
		(void) xfs_qm_reset_dqcounts(mp, bp, firstid, type);
Linus Torvalds's avatar
Linus Torvalds committed
1552 1553 1554 1555 1556 1557 1558
		xfs_bdwrite(mp, bp);
		/*
		 * goto the next block.
		 */
		bno++;
		firstid += XFS_QM_DQPERBLK(mp);
	}
1559
	return error;
Linus Torvalds's avatar
Linus Torvalds committed
1560 1561 1562
}

/*
1563
 * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
Linus Torvalds's avatar
Linus Torvalds committed
1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582
 * caller supplied function for every chunk of dquots that we find.
 */
STATIC int
xfs_qm_dqiterate(
	xfs_mount_t	*mp,
	xfs_inode_t	*qip,
	uint		flags)
{
	xfs_bmbt_irec_t		*map;
	int			i, nmaps;	/* number of map entries */
	int			error;		/* return value */
	xfs_fileoff_t		lblkno;
	xfs_filblks_t		maxlblkcnt;
	xfs_dqid_t		firstid;
	xfs_fsblock_t		rablkno;
	xfs_filblks_t		rablkcnt;

	error = 0;
	/*
1583
	 * This looks racy, but we can't keep an inode lock across a
Linus Torvalds's avatar
Linus Torvalds committed
1584 1585 1586 1587
	 * trans_reserve. But, this gets called during quotacheck, and that
	 * happens only at mount time which is single threaded.
	 */
	if (qip->i_d.di_nblocks == 0)
1588
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605

	map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);

	lblkno = 0;
	maxlblkcnt = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
	do {
		nmaps = XFS_DQITER_MAP_SIZE;
		/*
		 * We aren't changing the inode itself. Just changing
		 * some of its data. No new blocks are added here, and
		 * the inode is never added to the transaction.
		 */
		xfs_ilock(qip, XFS_ILOCK_SHARED);
		error = xfs_bmapi(NULL, qip, lblkno,
				  maxlblkcnt - lblkno,
				  XFS_BMAPI_METADATA,
				  NULL,
1606
				  0, map, &nmaps, NULL, NULL);
Linus Torvalds's avatar
Linus Torvalds committed
1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656
		xfs_iunlock(qip, XFS_ILOCK_SHARED);
		if (error)
			break;

		ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
		for (i = 0; i < nmaps; i++) {
			ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
			ASSERT(map[i].br_blockcount);


			lblkno += map[i].br_blockcount;

			if (map[i].br_startblock == HOLESTARTBLOCK)
				continue;

			firstid = (xfs_dqid_t) map[i].br_startoff *
				XFS_QM_DQPERBLK(mp);
			/*
			 * Do a read-ahead on the next extent.
			 */
			if ((i+1 < nmaps) &&
			    (map[i+1].br_startblock != HOLESTARTBLOCK)) {
				rablkcnt =  map[i+1].br_blockcount;
				rablkno = map[i+1].br_startblock;
				while (rablkcnt--) {
					xfs_baread(mp->m_ddev_targp,
					       XFS_FSB_TO_DADDR(mp, rablkno),
					       (int)XFS_QI_DQCHUNKLEN(mp));
					rablkno++;
				}
			}
			/*
			 * Iterate thru all the blks in the extent and
			 * reset the counters of all the dquots inside them.
			 */
			if ((error = xfs_qm_dqiter_bufs(mp,
						       firstid,
						       map[i].br_startblock,
						       map[i].br_blockcount,
						       flags))) {
				break;
			}
		}

		if (error)
			break;
	} while (nmaps > 0);

	kmem_free(map, XFS_DQITER_MAP_SIZE * sizeof(*map));

1657
	return error;
Linus Torvalds's avatar
Linus Torvalds committed
1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678
}

/*
 * Called by dqusage_adjust in doing a quotacheck.
 * Given the inode, and a dquot (either USR or GRP, doesn't matter),
 * this updates its incore copy as well as the buffer copy. This is
 * so that once the quotacheck is done, we can just log all the buffers,
 * as opposed to logging numerous updates to individual dquots.
 */
STATIC void
xfs_qm_quotacheck_dqadjust(
	xfs_dquot_t		*dqp,
	xfs_qcnt_t		nblks,
	xfs_qcnt_t		rtblks)
{
	ASSERT(XFS_DQ_IS_LOCKED(dqp));
	xfs_dqtrace_entry(dqp, "QCHECK DQADJUST");
	/*
	 * Adjust the inode count and the block count to reflect this inode's
	 * resource usage.
	 */
1679
	be64_add(&dqp->q_core.d_icount, 1);
Linus Torvalds's avatar
Linus Torvalds committed
1680 1681
	dqp->q_res_icount++;
	if (nblks) {
1682
		be64_add(&dqp->q_core.d_bcount, nblks);
Linus Torvalds's avatar
Linus Torvalds committed
1683 1684 1685
		dqp->q_res_bcount += nblks;
	}
	if (rtblks) {
1686
		be64_add(&dqp->q_core.d_rtbcount, rtblks);
Linus Torvalds's avatar
Linus Torvalds committed
1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706
		dqp->q_res_rtbcount += rtblks;
	}

	/*
	 * Set default limits, adjust timers (since we changed usages)
	 */
	if (! XFS_IS_SUSER_DQUOT(dqp)) {
		xfs_qm_adjust_dqlimits(dqp->q_mount, &dqp->q_core);
		xfs_qm_adjust_dqtimers(dqp->q_mount, &dqp->q_core);
	}

	dqp->dq_flags |= XFS_DQ_DIRTY;
}

STATIC int
xfs_qm_get_rtblks(
	xfs_inode_t	*ip,
	xfs_qcnt_t	*O_rtblks)
{
	xfs_filblks_t	rtblks;			/* total rt blks */
1707
	xfs_extnum_t	idx;			/* extent record index */
Linus Torvalds's avatar
Linus Torvalds committed
1708 1709 1710 1711 1712 1713 1714 1715 1716
	xfs_ifork_t	*ifp;			/* inode fork pointer */
	xfs_extnum_t	nextents;		/* number of extent entries */
	xfs_bmbt_rec_t	*ep;			/* pointer to an extent entry */
	int		error;

	ASSERT(XFS_IS_REALTIME_INODE(ip));
	ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
		if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1717
			return error;
Linus Torvalds's avatar
Linus Torvalds committed
1718 1719
	}
	rtblks = 0;
1720 1721 1722
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	for (idx = 0; idx < nextents; idx++) {
		ep = xfs_iext_get_ext(ifp, idx);
Linus Torvalds's avatar
Linus Torvalds committed
1723
		rtblks += xfs_bmbt_get_blockcount(ep);
1724
	}
Linus Torvalds's avatar
Linus Torvalds committed
1725
	*O_rtblks = (xfs_qcnt_t)rtblks;
1726
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
}

/*
 * callback routine supplied to bulkstat(). Given an inumber, find its
 * dquots and update them to account for resources taken by that inode.
 */
/* ARGSUSED */
STATIC int
xfs_qm_dqusage_adjust(
	xfs_mount_t	*mp,		/* mount point for filesystem */
	xfs_ino_t	ino,		/* inode number to get data for */
	void		__user *buffer,	/* not used */
	int		ubsize,		/* not used */
	void		*private_data,	/* not used */
	xfs_daddr_t	bno,		/* starting block of inode cluster */
	int		*ubused,	/* not used */
	void		*dip,		/* on-disk inode pointer (not used) */
	int		*res)		/* result code value */
{
	xfs_inode_t	*ip;
	xfs_dquot_t	*udqp, *gdqp;
	xfs_qcnt_t	nblks, rtblks;
	int		error;

	ASSERT(XFS_IS_QUOTA_RUNNING(mp));

	/*
	 * rootino must have its resources accounted for, not so with the quota
	 * inodes.
	 */
	if (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino) {
		*res = BULKSTAT_RV_NOTHING;
		return XFS_ERROR(EINVAL);
	}

	/*
	 * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
	 * interface expects the inode to be exclusively locked because that's
	 * the case in all other instances. It's OK that we do this because
	 * quotacheck is done only at mount time.
	 */
	if ((error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip, bno))) {
		*res = BULKSTAT_RV_NOTHING;
1770
		return error;
Linus Torvalds's avatar
Linus Torvalds committed
1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787
	}

	if (ip->i_d.di_mode == 0) {
		xfs_iput_new(ip, XFS_ILOCK_EXCL);
		*res = BULKSTAT_RV_NOTHING;
		return XFS_ERROR(ENOENT);
	}

	/*
	 * Obtain the locked dquots. In case of an error (eg. allocation
	 * fails for ENOSPC), we return the negative of the error number
	 * to bulkstat, so that it can get propagated to quotacheck() and
	 * making us disable quotas for the file system.
	 */
	if ((error = xfs_qm_dqget_noattach(ip, &udqp, &gdqp))) {
		xfs_iput(ip, XFS_ILOCK_EXCL);
		*res = BULKSTAT_RV_GIVEUP;
1788
		return error;
Linus Torvalds's avatar
Linus Torvalds committed
1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804
	}

	rtblks = 0;
	if (! XFS_IS_REALTIME_INODE(ip)) {
		nblks = (xfs_qcnt_t)ip->i_d.di_nblocks;
	} else {
		/*
		 * Walk thru the extent list and count the realtime blocks.
		 */
		if ((error = xfs_qm_get_rtblks(ip, &rtblks))) {
			xfs_iput(ip, XFS_ILOCK_EXCL);
			if (udqp)
				xfs_qm_dqput(udqp);
			if (gdqp)
				xfs_qm_dqput(gdqp);
			*res = BULKSTAT_RV_GIVEUP;
1805
			return error;
Linus Torvalds's avatar
Linus Torvalds committed
1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826
		}
		nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
	}
	ASSERT(ip->i_delayed_blks == 0);

	/*
	 * We can't release the inode while holding its dquot locks.
	 * The inode can go into inactive and might try to acquire the dquotlocks.
	 * So, just unlock here and do a vn_rele at the end.
	 */
	xfs_iunlock(ip, XFS_ILOCK_EXCL);

	/*
	 * Add the (disk blocks and inode) resources occupied by this
	 * inode to its dquots. We do this adjustment in the incore dquot,
	 * and also copy the changes to its buffer.
	 * We don't care about putting these changes in a transaction
	 * envelope because if we crash in the middle of a 'quotacheck'
	 * we have to start from the beginning anyway.
	 * Once we're done, we'll log all the dquot bufs.
	 *
1827
	 * The *QUOTA_ON checks below may look pretty racy, but quotachecks
Linus Torvalds's avatar
Linus Torvalds committed
1828 1829 1830 1831 1832 1833 1834
	 * and quotaoffs don't race. (Quotachecks happen at mount time only).
	 */
	if (XFS_IS_UQUOTA_ON(mp)) {
		ASSERT(udqp);
		xfs_qm_quotacheck_dqadjust(udqp, nblks, rtblks);
		xfs_qm_dqput(udqp);
	}
1835
	if (XFS_IS_OQUOTA_ON(mp)) {
Linus Torvalds's avatar
Linus Torvalds committed
1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849
		ASSERT(gdqp);
		xfs_qm_quotacheck_dqadjust(gdqp, nblks, rtblks);
		xfs_qm_dqput(gdqp);
	}
	/*
	 * Now release the inode. This will send it to 'inactive', and
	 * possibly even free blocks.
	 */
	VN_RELE(XFS_ITOV(ip));

	/*
	 * Goto next inode.
	 */
	*res = BULKSTAT_RV_DIDONE;
1850
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883
}

/*
 * Walk thru all the filesystem inodes and construct a consistent view
 * of the disk quota world. If the quotacheck fails, disable quotas.
 */
int
xfs_qm_quotacheck(
	xfs_mount_t	*mp)
{
	int		done, count, error;
	xfs_ino_t	lastino;
	size_t		structsz;
	xfs_inode_t	*uip, *gip;
	uint		flags;

	count = INT_MAX;
	structsz = 1;
	lastino = 0;
	flags = 0;

	ASSERT(XFS_QI_UQIP(mp) || XFS_QI_GQIP(mp));
	ASSERT(XFS_IS_QUOTA_RUNNING(mp));

	/*
	 * There should be no cached dquots. The (simplistic) quotacheck
	 * algorithm doesn't like that.
	 */
	ASSERT(XFS_QI_MPLNDQUOTS(mp) == 0);

	cmn_err(CE_NOTE, "XFS quotacheck %s: Please wait.", mp->m_fsname);

	/*
1884
	 * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
Linus Torvalds's avatar
Linus Torvalds committed
1885 1886 1887 1888 1889 1890 1891 1892 1893 1894
	 * their counters to zero. We need a clean slate.
	 * We don't log our changes till later.
	 */
	if ((uip = XFS_QI_UQIP(mp))) {
		if ((error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA)))
			goto error_return;
		flags |= XFS_UQUOTA_CHKD;
	}

	if ((gip = XFS_QI_GQIP(mp))) {
1895 1896
		if ((error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
					XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA)))
Linus Torvalds's avatar
Linus Torvalds committed
1897
			goto error_return;
1898
		flags |= XFS_OQUOTA_CHKD;
Linus Torvalds's avatar
Linus Torvalds committed
1899 1900 1901 1902 1903 1904 1905 1906 1907
	}

	do {
		/*
		 * Iterate thru all the inodes in the file system,
		 * adjusting the corresponding dquot counters in core.
		 */
		if ((error = xfs_bulkstat(mp, &lastino, &count,
				     xfs_qm_dqusage_adjust, NULL,
1908
				     structsz, NULL, BULKSTAT_FG_IGET, &done)))
Linus Torvalds's avatar
Linus Torvalds committed
1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920
			break;

	} while (! done);

	/*
	 * We can get this error if we couldn't do a dquot allocation inside
	 * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
	 * dirty dquots that might be cached, we just want to get rid of them
	 * and turn quotaoff. The dquots won't be attached to any of the inodes
	 * at this point (because we intentionally didn't in dqget_noattach).
	 */
	if (error) {
1921
		xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_QUOTAOFF);
Linus Torvalds's avatar
Linus Torvalds committed
1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943
		goto error_return;
	}
	/*
	 * We've made all the changes that we need to make incore.
	 * Now flush_them down to disk buffers.
	 */
	xfs_qm_dqflush_all(mp, XFS_QMOPT_DELWRI);

	/*
	 * We didn't log anything, because if we crashed, we'll have to
	 * start the quotacheck from scratch anyway. However, we must make
	 * sure that our dquot changes are secure before we put the
	 * quotacheck'd stamp on the superblock. So, here we do a synchronous
	 * flush.
	 */
	XFS_bflush(mp->m_ddev_targp);

	/*
	 * If one type of quotas is off, then it will lose its
	 * quotachecked status, since we won't be doing accounting for
	 * that type anymore.
	 */
1944
	mp->m_qflags &= ~(XFS_OQUOTA_CHKD | XFS_UQUOTA_CHKD);
Linus Torvalds's avatar
Linus Torvalds committed
1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959
	mp->m_qflags |= flags;

	XQM_LIST_PRINT(&(XFS_QI_MPL_LIST(mp)), MPL_NEXT, "++++ Mp list +++");

 error_return:
	if (error) {
		cmn_err(CE_WARN, "XFS quotacheck %s: Unsuccessful (Error %d): "
			"Disabling quotas.",
			mp->m_fsname, error);
		/*
		 * We must turn off quotas.
		 */
		ASSERT(mp->m_quotainfo != NULL);
		ASSERT(xfs_Gqm != NULL);
		xfs_qm_destroy_quotainfo(mp);
1960
		(void)xfs_mount_reset_sbqflags(mp);
Linus Torvalds's avatar
Linus Torvalds committed
1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995
	} else {
		cmn_err(CE_NOTE, "XFS quotacheck %s: Done.", mp->m_fsname);
	}
	return (error);
}

/*
 * This is called after the superblock has been read in and we're ready to
 * iget the quota inodes.
 */
STATIC int
xfs_qm_init_quotainos(
	xfs_mount_t	*mp)
{
	xfs_inode_t	*uip, *gip;
	int		error;
	__int64_t	sbflags;
	uint		flags;

	ASSERT(mp->m_quotainfo);
	uip = gip = NULL;
	sbflags = 0;
	flags = 0;

	/*
	 * Get the uquota and gquota inodes
	 */
	if (XFS_SB_VERSION_HASQUOTA(&mp->m_sb)) {
		if (XFS_IS_UQUOTA_ON(mp) &&
		    mp->m_sb.sb_uquotino != NULLFSINO) {
			ASSERT(mp->m_sb.sb_uquotino > 0);
			if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
					     0, 0, &uip, 0)))
				return XFS_ERROR(error);
		}
1996
		if (XFS_IS_OQUOTA_ON(mp) &&
Linus Torvalds's avatar
Linus Torvalds committed
1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
		    mp->m_sb.sb_gquotino != NULLFSINO) {
			ASSERT(mp->m_sb.sb_gquotino > 0);
			if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
					     0, 0, &gip, 0))) {
				if (uip)
					VN_RELE(XFS_ITOV(uip));
				return XFS_ERROR(error);
			}
		}
	} else {
		flags |= XFS_QMOPT_SBVERSION;
		sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
			    XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
	}

	/*
	 * Create the two inodes, if they don't exist already. The changes
	 * made above will get added to a transaction and logged in one of
	 * the qino_alloc calls below.  If the device is readonly,
	 * temporarily switch to read-write to do this.
	 */
	if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
		if ((error = xfs_qm_qino_alloc(mp, &uip,
					      sbflags | XFS_SB_UQUOTINO,
					      flags | XFS_QMOPT_UQUOTA)))
			return XFS_ERROR(error);

		flags &= ~XFS_QMOPT_SBVERSION;
	}
2026 2027 2028 2029 2030 2031
	if (XFS_IS_OQUOTA_ON(mp) && gip == NULL) {
		flags |= (XFS_IS_GQUOTA_ON(mp) ?
				XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
		error = xfs_qm_qino_alloc(mp, &gip,
					  sbflags | XFS_SB_GQUOTINO, flags);
		if (error) {
Linus Torvalds's avatar
Linus Torvalds committed
2032 2033 2034 2035 2036 2037 2038 2039 2040 2041
			if (uip)
				VN_RELE(XFS_ITOV(uip));

			return XFS_ERROR(error);
		}
	}

	XFS_QI_UQIP(mp) = uip;
	XFS_QI_GQIP(mp) = gip;

2042
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062
}


/*
 * Traverse the freelist of dquots and attempt to reclaim a maximum of
 * 'howmany' dquots. This operation races with dqlookup(), and attempts to
 * favor the lookup function ...
 * XXXsup merge this with qm_reclaim_one().
 */
STATIC int
xfs_qm_shake_freelist(
	int howmany)
{
	int		nreclaimed;
	xfs_dqhash_t	*hash;
	xfs_dquot_t	*dqp, *nextdqp;
	int		restarts;
	int		nflushes;

	if (howmany <= 0)
2063
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088

	nreclaimed = 0;
	restarts = 0;
	nflushes = 0;

#ifdef QUOTADEBUG
	cmn_err(CE_DEBUG, "Shake free 0x%x", howmany);
#endif
	/* lock order is : hashchainlock, freelistlock, mplistlock */
 tryagain:
	xfs_qm_freelist_lock(xfs_Gqm);

	for (dqp = xfs_Gqm->qm_dqfreelist.qh_next;
	     ((dqp != (xfs_dquot_t *) &xfs_Gqm->qm_dqfreelist) &&
	      nreclaimed < howmany); ) {
		xfs_dqlock(dqp);

		/*
		 * We are racing with dqlookup here. Naturally we don't
		 * want to reclaim a dquot that lookup wants.
		 */
		if (dqp->dq_flags & XFS_DQ_WANT) {
			xfs_dqunlock(dqp);
			xfs_qm_freelist_unlock(xfs_Gqm);
			if (++restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
2089
				return nreclaimed;
Linus Torvalds's avatar
Linus Torvalds committed
2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163
			XQM_STATS_INC(xqmstats.xs_qm_dqwants);
			goto tryagain;
		}

		/*
		 * If the dquot is inactive, we are assured that it is
		 * not on the mplist or the hashlist, and that makes our
		 * life easier.
		 */
		if (dqp->dq_flags & XFS_DQ_INACTIVE) {
			ASSERT(dqp->q_mount == NULL);
			ASSERT(! XFS_DQ_IS_DIRTY(dqp));
			ASSERT(dqp->HL_PREVP == NULL);
			ASSERT(dqp->MPL_PREVP == NULL);
			XQM_STATS_INC(xqmstats.xs_qm_dqinact_reclaims);
			nextdqp = dqp->dq_flnext;
			goto off_freelist;
		}

		ASSERT(dqp->MPL_PREVP);
		/*
		 * Try to grab the flush lock. If this dquot is in the process of
		 * getting flushed to disk, we don't want to reclaim it.
		 */
		if (! xfs_qm_dqflock_nowait(dqp)) {
			xfs_dqunlock(dqp);
			dqp = dqp->dq_flnext;
			continue;
		}

		/*
		 * We have the flush lock so we know that this is not in the
		 * process of being flushed. So, if this is dirty, flush it
		 * DELWRI so that we don't get a freelist infested with
		 * dirty dquots.
		 */
		if (XFS_DQ_IS_DIRTY(dqp)) {
			xfs_dqtrace_entry(dqp, "DQSHAKE: DQDIRTY");
			/*
			 * We flush it delayed write, so don't bother
			 * releasing the mplock.
			 */
			(void) xfs_qm_dqflush(dqp, XFS_QMOPT_DELWRI);
			xfs_dqunlock(dqp); /* dqflush unlocks dqflock */
			dqp = dqp->dq_flnext;
			continue;
		}
		/*
		 * We're trying to get the hashlock out of order. This races
		 * with dqlookup; so, we giveup and goto the next dquot if
		 * we couldn't get the hashlock. This way, we won't starve
		 * a dqlookup process that holds the hashlock that is
		 * waiting for the freelist lock.
		 */
		if (! xfs_qm_dqhashlock_nowait(dqp)) {
			xfs_dqfunlock(dqp);
			xfs_dqunlock(dqp);
			dqp = dqp->dq_flnext;
			continue;
		}
		/*
		 * This races with dquot allocation code as well as dqflush_all
		 * and reclaim code. So, if we failed to grab the mplist lock,
		 * giveup everything and start over.
		 */
		hash = dqp->q_hash;
		ASSERT(hash);
		if (! xfs_qm_mplist_nowait(dqp->q_mount)) {
			/* XXX put a sentinel so that we can come back here */
			xfs_dqfunlock(dqp);
			xfs_dqunlock(dqp);
			XFS_DQ_HASH_UNLOCK(hash);
			xfs_qm_freelist_unlock(xfs_Gqm);
			if (++restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
2164
				return nreclaimed;
Linus Torvalds's avatar
Linus Torvalds committed
2165 2166 2167 2168 2169
			goto tryagain;
		}
		xfs_dqtrace_entry(dqp, "DQSHAKE: UNLINKING");
#ifdef QUOTADEBUG
		cmn_err(CE_DEBUG, "Shake 0x%p, ID 0x%x\n",
2170
			dqp, be32_to_cpu(dqp->q_core.d_id));
Linus Torvalds's avatar
Linus Torvalds committed
2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188
#endif
		ASSERT(dqp->q_nrefs == 0);
		nextdqp = dqp->dq_flnext;
		XQM_MPLIST_REMOVE(&(XFS_QI_MPL_LIST(dqp->q_mount)), dqp);
		XQM_HASHLIST_REMOVE(hash, dqp);
		xfs_dqfunlock(dqp);
		xfs_qm_mplist_unlock(dqp->q_mount);
		XFS_DQ_HASH_UNLOCK(hash);

 off_freelist:
		XQM_FREELIST_REMOVE(dqp);
		xfs_dqunlock(dqp);
		nreclaimed++;
		XQM_STATS_INC(xqmstats.xs_qm_dqshake_reclaims);
		xfs_qm_dqdestroy(dqp);
		dqp = nextdqp;
	}
	xfs_qm_freelist_unlock(xfs_Gqm);
2189
	return nreclaimed;
Linus Torvalds's avatar
Linus Torvalds committed
2190 2191 2192 2193 2194 2195 2196 2197
}


/*
 * The kmem_shake interface is invoked when memory is running low.
 */
/* ARGSUSED */
STATIC int
2198
xfs_qm_shake(int nr_to_scan, gfp_t gfp_mask)
Linus Torvalds's avatar
Linus Torvalds committed
2199 2200 2201 2202
{
	int	ndqused, nfree, n;

	if (!kmem_shake_allow(gfp_mask))
2203
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
2204
	if (!xfs_Gqm)
2205
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
2206 2207 2208 2209 2210 2211 2212 2213

	nfree = xfs_Gqm->qm_dqfreelist.qh_nelems; /* free dquots */
	/* incore dquots in all f/s's */
	ndqused = atomic_read(&xfs_Gqm->qm_totaldquots) - nfree;

	ASSERT(ndqused >= 0);

	if (nfree <= ndqused && nfree < ndquot)
2214
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257

	ndqused *= xfs_Gqm->qm_dqfree_ratio;	/* target # of free dquots */
	n = nfree - ndqused - ndquot;		/* # over target */

	return xfs_qm_shake_freelist(MAX(nfree, n));
}


/*
 * Just pop the least recently used dquot off the freelist and
 * recycle it. The returned dquot is locked.
 */
STATIC xfs_dquot_t *
xfs_qm_dqreclaim_one(void)
{
	xfs_dquot_t	*dqpout;
	xfs_dquot_t	*dqp;
	int		restarts;
	int		nflushes;

	restarts = 0;
	dqpout = NULL;
	nflushes = 0;

	/* lockorder: hashchainlock, freelistlock, mplistlock, dqlock, dqflock */
 startagain:
	xfs_qm_freelist_lock(xfs_Gqm);

	FOREACH_DQUOT_IN_FREELIST(dqp, &(xfs_Gqm->qm_dqfreelist)) {
		xfs_dqlock(dqp);

		/*
		 * We are racing with dqlookup here. Naturally we don't
		 * want to reclaim a dquot that lookup wants. We release the
		 * freelist lock and start over, so that lookup will grab
		 * both the dquot and the freelistlock.
		 */
		if (dqp->dq_flags & XFS_DQ_WANT) {
			ASSERT(! (dqp->dq_flags & XFS_DQ_INACTIVE));
			xfs_dqtrace_entry(dqp, "DQRECLAIM: DQWANT");
			xfs_dqunlock(dqp);
			xfs_qm_freelist_unlock(xfs_Gqm);
			if (++restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
2258
				return NULL;
Linus Torvalds's avatar
Linus Torvalds committed
2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333
			XQM_STATS_INC(xqmstats.xs_qm_dqwants);
			goto startagain;
		}

		/*
		 * If the dquot is inactive, we are assured that it is
		 * not on the mplist or the hashlist, and that makes our
		 * life easier.
		 */
		if (dqp->dq_flags & XFS_DQ_INACTIVE) {
			ASSERT(dqp->q_mount == NULL);
			ASSERT(! XFS_DQ_IS_DIRTY(dqp));
			ASSERT(dqp->HL_PREVP == NULL);
			ASSERT(dqp->MPL_PREVP == NULL);
			XQM_FREELIST_REMOVE(dqp);
			xfs_dqunlock(dqp);
			dqpout = dqp;
			XQM_STATS_INC(xqmstats.xs_qm_dqinact_reclaims);
			break;
		}

		ASSERT(dqp->q_hash);
		ASSERT(dqp->MPL_PREVP);

		/*
		 * Try to grab the flush lock. If this dquot is in the process of
		 * getting flushed to disk, we don't want to reclaim it.
		 */
		if (! xfs_qm_dqflock_nowait(dqp)) {
			xfs_dqunlock(dqp);
			continue;
		}

		/*
		 * We have the flush lock so we know that this is not in the
		 * process of being flushed. So, if this is dirty, flush it
		 * DELWRI so that we don't get a freelist infested with
		 * dirty dquots.
		 */
		if (XFS_DQ_IS_DIRTY(dqp)) {
			xfs_dqtrace_entry(dqp, "DQRECLAIM: DQDIRTY");
			/*
			 * We flush it delayed write, so don't bother
			 * releasing the freelist lock.
			 */
			(void) xfs_qm_dqflush(dqp, XFS_QMOPT_DELWRI);
			xfs_dqunlock(dqp); /* dqflush unlocks dqflock */
			continue;
		}

		if (! xfs_qm_mplist_nowait(dqp->q_mount)) {
			xfs_dqfunlock(dqp);
			xfs_dqunlock(dqp);
			continue;
		}

		if (! xfs_qm_dqhashlock_nowait(dqp))
			goto mplistunlock;

		ASSERT(dqp->q_nrefs == 0);
		xfs_dqtrace_entry(dqp, "DQRECLAIM: UNLINKING");
		XQM_MPLIST_REMOVE(&(XFS_QI_MPL_LIST(dqp->q_mount)), dqp);
		XQM_HASHLIST_REMOVE(dqp->q_hash, dqp);
		XQM_FREELIST_REMOVE(dqp);
		dqpout = dqp;
		XFS_DQ_HASH_UNLOCK(dqp->q_hash);
 mplistunlock:
		xfs_qm_mplist_unlock(dqp->q_mount);
		xfs_dqfunlock(dqp);
		xfs_dqunlock(dqp);
		if (dqpout)
			break;
	}

	xfs_qm_freelist_unlock(xfs_Gqm);
2334
	return dqpout;
Linus Torvalds's avatar
Linus Torvalds committed
2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369
}


/*------------------------------------------------------------------*/

/*
 * Return a new incore dquot. Depending on the number of
 * dquots in the system, we either allocate a new one on the kernel heap,
 * or reclaim a free one.
 * Return value is B_TRUE if we allocated a new dquot, B_FALSE if we managed
 * to reclaim an existing one from the freelist.
 */
boolean_t
xfs_qm_dqalloc_incore(
	xfs_dquot_t **O_dqpp)
{
	xfs_dquot_t	*dqp;

	/*
	 * Check against high water mark to see if we want to pop
	 * a nincompoop dquot off the freelist.
	 */
	if (atomic_read(&xfs_Gqm->qm_totaldquots) >= ndquot) {
		/*
		 * Try to recycle a dquot from the freelist.
		 */
		if ((dqp = xfs_qm_dqreclaim_one())) {
			XQM_STATS_INC(xqmstats.xs_qm_dqreclaims);
			/*
			 * Just zero the core here. The rest will get
			 * reinitialized by caller. XXX we shouldn't even
			 * do this zero ...
			 */
			memset(&dqp->q_core, 0, sizeof(dqp->q_core));
			*O_dqpp = dqp;
2370
			return B_FALSE;
Linus Torvalds's avatar
Linus Torvalds committed
2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382
		}
		XQM_STATS_INC(xqmstats.xs_qm_dqreclaim_misses);
	}

	/*
	 * Allocate a brand new dquot on the kernel heap and return it
	 * to the caller to initialize.
	 */
	ASSERT(xfs_Gqm->qm_dqzone != NULL);
	*O_dqpp = kmem_zone_zalloc(xfs_Gqm->qm_dqzone, KM_SLEEP);
	atomic_inc(&xfs_Gqm->qm_totaldquots);

2383
	return B_TRUE;
Linus Torvalds's avatar
Linus Torvalds committed
2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407
}


/*
 * Start a transaction and write the incore superblock changes to
 * disk. flags parameter indicates which fields have changed.
 */
int
xfs_qm_write_sb_changes(
	xfs_mount_t	*mp,
	__int64_t	flags)
{
	xfs_trans_t	*tp;
	int		error;

#ifdef QUOTADEBUG
	cmn_err(CE_NOTE, "Writing superblock quota changes :%s", mp->m_fsname);
#endif
	tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
	if ((error = xfs_trans_reserve(tp, 0,
				      mp->m_sb.sb_sectsize + 128, 0,
				      0,
				      XFS_DEFAULT_LOG_COUNT))) {
		xfs_trans_cancel(tp, 0);
2408
		return error;
Linus Torvalds's avatar
Linus Torvalds committed
2409 2410 2411 2412 2413
	}

	xfs_mod_sb(tp, flags);
	(void) xfs_trans_commit(tp, 0, NULL);

2414
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436
}


/* --------------- utility functions for vnodeops ---------------- */


/*
 * Given an inode, a uid and gid (from cred_t) make sure that we have
 * allocated relevant dquot(s) on disk, and that we won't exceed inode
 * quotas by creating this file.
 * This also attaches dquot(s) to the given inode after locking it,
 * and returns the dquots corresponding to the uid and/or gid.
 *
 * in	: inode (unlocked)
 * out	: udquot, gdquot with references taken and unlocked
 */
int
xfs_qm_vop_dqalloc(
	xfs_mount_t	*mp,
	xfs_inode_t	*ip,
	uid_t		uid,
	gid_t		gid,
2437
	prid_t		prid,
Linus Torvalds's avatar
Linus Torvalds committed
2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463
	uint		flags,
	xfs_dquot_t	**O_udqpp,
	xfs_dquot_t	**O_gdqpp)
{
	int		error;
	xfs_dquot_t	*uq, *gq;
	uint		lockflags;

	if (!XFS_IS_QUOTA_ON(mp))
		return 0;

	lockflags = XFS_ILOCK_EXCL;
	xfs_ilock(ip, lockflags);

	if ((flags & XFS_QMOPT_INHERIT) &&
	    XFS_INHERIT_GID(ip, XFS_MTOVFS(mp)))
		gid = ip->i_d.di_gid;

	/*
	 * Attach the dquot(s) to this inode, doing a dquot allocation
	 * if necessary. The dquot(s) will not be locked.
	 */
	if (XFS_NOT_DQATTACHED(mp, ip)) {
		if ((error = xfs_qm_dqattach(ip, XFS_QMOPT_DQALLOC |
					    XFS_QMOPT_ILOCKED))) {
			xfs_iunlock(ip, lockflags);
2464
			return error;
Linus Torvalds's avatar
Linus Torvalds committed
2465 2466 2467 2468
		}
	}

	uq = gq = NULL;
2469
	if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
Linus Torvalds's avatar
Linus Torvalds committed
2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486
		if (ip->i_d.di_uid != uid) {
			/*
			 * What we need is the dquot that has this uid, and
			 * if we send the inode to dqget, the uid of the inode
			 * takes priority over what's sent in the uid argument.
			 * We must unlock inode here before calling dqget if
			 * we're not sending the inode, because otherwise
			 * we'll deadlock by doing trans_reserve while
			 * holding ilock.
			 */
			xfs_iunlock(ip, lockflags);
			if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
						 XFS_DQ_USER,
						 XFS_QMOPT_DQALLOC |
						 XFS_QMOPT_DOWARN,
						 &uq))) {
				ASSERT(error != ENOENT);
2487
				return error;
Linus Torvalds's avatar
Linus Torvalds committed
2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506
			}
			/*
			 * Get the ilock in the right order.
			 */
			xfs_dqunlock(uq);
			lockflags = XFS_ILOCK_SHARED;
			xfs_ilock(ip, lockflags);
		} else {
			/*
			 * Take an extra reference, because we'll return
			 * this to caller
			 */
			ASSERT(ip->i_udquot);
			uq = ip->i_udquot;
			xfs_dqlock(uq);
			XFS_DQHOLD(uq);
			xfs_dqunlock(uq);
		}
	}
2507
	if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
Linus Torvalds's avatar
Linus Torvalds committed
2508 2509 2510 2511 2512 2513 2514 2515 2516 2517
		if (ip->i_d.di_gid != gid) {
			xfs_iunlock(ip, lockflags);
			if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)gid,
						 XFS_DQ_GROUP,
						 XFS_QMOPT_DQALLOC |
						 XFS_QMOPT_DOWARN,
						 &gq))) {
				if (uq)
					xfs_qm_dqrele(uq);
				ASSERT(error != ENOENT);
2518
				return error;
Linus Torvalds's avatar
Linus Torvalds committed
2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529
			}
			xfs_dqunlock(gq);
			lockflags = XFS_ILOCK_SHARED;
			xfs_ilock(ip, lockflags);
		} else {
			ASSERT(ip->i_gdquot);
			gq = ip->i_gdquot;
			xfs_dqlock(gq);
			XFS_DQHOLD(gq);
			xfs_dqunlock(gq);
		}
2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552
	} else if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
		if (ip->i_d.di_projid != prid) {
			xfs_iunlock(ip, lockflags);
			if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
						 XFS_DQ_PROJ,
						 XFS_QMOPT_DQALLOC |
						 XFS_QMOPT_DOWARN,
						 &gq))) {
				if (uq)
					xfs_qm_dqrele(uq);
				ASSERT(error != ENOENT);
				return (error);
			}
			xfs_dqunlock(gq);
			lockflags = XFS_ILOCK_SHARED;
			xfs_ilock(ip, lockflags);
		} else {
			ASSERT(ip->i_gdquot);
			gq = ip->i_gdquot;
			xfs_dqlock(gq);
			XFS_DQHOLD(gq);
			xfs_dqunlock(gq);
		}
Linus Torvalds's avatar
Linus Torvalds committed
2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565
	}
	if (uq)
		xfs_dqtrace_entry_ino(uq, "DQALLOC", ip);

	xfs_iunlock(ip, lockflags);
	if (O_udqpp)
		*O_udqpp = uq;
	else if (uq)
		xfs_qm_dqrele(uq);
	if (O_gdqpp)
		*O_gdqpp = gq;
	else if (gq)
		xfs_qm_dqrele(gq);
2566
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580
}

/*
 * Actually transfer ownership, and do dquot modifications.
 * These were already reserved.
 */
xfs_dquot_t *
xfs_qm_vop_chown(
	xfs_trans_t	*tp,
	xfs_inode_t	*ip,
	xfs_dquot_t	**IO_olddq,
	xfs_dquot_t	*newdq)
{
	xfs_dquot_t	*prevdq;
2581 2582 2583
	uint		bfield = XFS_IS_REALTIME_INODE(ip) ?
				 XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;

Linus Torvalds's avatar
Linus Torvalds committed
2584 2585 2586 2587 2588 2589 2590 2591
	ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
	ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));

	/* old dquot */
	prevdq = *IO_olddq;
	ASSERT(prevdq);
	ASSERT(prevdq != newdq);

2592 2593
	xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
	xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
Linus Torvalds's avatar
Linus Torvalds committed
2594 2595

	/* the sparkling new dquot */
2596 2597
	xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
	xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
Linus Torvalds's avatar
Linus Torvalds committed
2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608

	/*
	 * Take an extra reference, because the inode
	 * is going to keep this dquot pointer even
	 * after the trans_commit.
	 */
	xfs_dqlock(newdq);
	XFS_DQHOLD(newdq);
	xfs_dqunlock(newdq);
	*IO_olddq = newdq;

2609
	return prevdq;
Linus Torvalds's avatar
Linus Torvalds committed
2610 2611 2612
}

/*
2613
 * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
Linus Torvalds's avatar
Linus Torvalds committed
2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624
 */
int
xfs_qm_vop_chown_reserve(
	xfs_trans_t	*tp,
	xfs_inode_t	*ip,
	xfs_dquot_t	*udqp,
	xfs_dquot_t	*gdqp,
	uint		flags)
{
	int		error;
	xfs_mount_t	*mp;
2625
	uint		delblks, blkflags, prjflags = 0;
Linus Torvalds's avatar
Linus Torvalds committed
2626 2627 2628 2629 2630 2631 2632 2633
	xfs_dquot_t	*unresudq, *unresgdq, *delblksudq, *delblksgdq;

	ASSERT(XFS_ISLOCKED_INODE(ip));
	mp = ip->i_mount;
	ASSERT(XFS_IS_QUOTA_RUNNING(mp));

	delblks = ip->i_delayed_blks;
	delblksudq = delblksgdq = unresudq = unresgdq = NULL;
2634 2635
	blkflags = XFS_IS_REALTIME_INODE(ip) ?
			XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
Linus Torvalds's avatar
Linus Torvalds committed
2636 2637

	if (XFS_IS_UQUOTA_ON(mp) && udqp &&
2638
	    ip->i_d.di_uid != (uid_t)be32_to_cpu(udqp->q_core.d_id)) {
Linus Torvalds's avatar
Linus Torvalds committed
2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649
		delblksudq = udqp;
		/*
		 * If there are delayed allocation blocks, then we have to
		 * unreserve those from the old dquot, and add them to the
		 * new dquot.
		 */
		if (delblks) {
			ASSERT(ip->i_udquot);
			unresudq = ip->i_udquot;
		}
	}
2650
	if (XFS_IS_OQUOTA_ON(ip->i_mount) && gdqp) {
2651 2652 2653 2654 2655 2656 2657
		if (XFS_IS_PQUOTA_ON(ip->i_mount) &&
		     ip->i_d.di_projid != be32_to_cpu(gdqp->q_core.d_id))
			prjflags = XFS_QMOPT_ENOSPC;

		if (prjflags ||
		    (XFS_IS_GQUOTA_ON(ip->i_mount) &&
		     ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id))) {
2658 2659 2660 2661 2662
			delblksgdq = gdqp;
			if (delblks) {
				ASSERT(ip->i_gdquot);
				unresgdq = ip->i_gdquot;
			}
Linus Torvalds's avatar
Linus Torvalds committed
2663 2664 2665 2666 2667
		}
	}

	if ((error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
				delblksudq, delblksgdq, ip->i_d.di_nblocks, 1,
2668
				flags | blkflags | prjflags)))
Linus Torvalds's avatar
Linus Torvalds committed
2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684
		return (error);

	/*
	 * Do the delayed blks reservations/unreservations now. Since, these
	 * are done without the help of a transaction, if a reservation fails
	 * its previous reservations won't be automatically undone by trans
	 * code. So, we have to do it manually here.
	 */
	if (delblks) {
		/*
		 * Do the reservations first. Unreservation can't fail.
		 */
		ASSERT(delblksudq || delblksgdq);
		ASSERT(unresudq || unresgdq);
		if ((error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
				delblksudq, delblksgdq, (xfs_qcnt_t)delblks, 0,
2685
				flags | blkflags | prjflags)))
Linus Torvalds's avatar
Linus Torvalds committed
2686 2687 2688
			return (error);
		xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
				unresudq, unresgdq, -((xfs_qcnt_t)delblks), 0,
2689
				blkflags);
Linus Torvalds's avatar
Linus Torvalds committed
2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705
	}

	return (0);
}

int
xfs_qm_vop_rename_dqattach(
	xfs_inode_t	**i_tab)
{
	xfs_inode_t	*ip;
	int		i;
	int		error;

	ip = i_tab[0];

	if (! XFS_IS_QUOTA_ON(ip->i_mount))
2706
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
2707 2708 2709 2710

	if (XFS_NOT_DQATTACHED(ip->i_mount, ip)) {
		error = xfs_qm_dqattach(ip, 0);
		if (error)
2711
			return error;
Linus Torvalds's avatar
Linus Torvalds committed
2712 2713 2714 2715 2716 2717 2718 2719 2720
	}
	for (i = 1; (i < 4 && i_tab[i]); i++) {
		/*
		 * Watch out for duplicate entries in the table.
		 */
		if ((ip = i_tab[i]) != i_tab[i-1]) {
			if (XFS_NOT_DQATTACHED(ip->i_mount, ip)) {
				error = xfs_qm_dqattach(ip, 0);
				if (error)
2721
					return error;
Linus Torvalds's avatar
Linus Torvalds committed
2722 2723 2724
			}
		}
	}
2725
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746
}

void
xfs_qm_vop_dqattach_and_dqmod_newinode(
	xfs_trans_t	*tp,
	xfs_inode_t	*ip,
	xfs_dquot_t	*udqp,
	xfs_dquot_t	*gdqp)
{
	if (!XFS_IS_QUOTA_ON(tp->t_mountp))
		return;

	ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
	ASSERT(XFS_IS_QUOTA_RUNNING(tp->t_mountp));

	if (udqp) {
		xfs_dqlock(udqp);
		XFS_DQHOLD(udqp);
		xfs_dqunlock(udqp);
		ASSERT(ip->i_udquot == NULL);
		ip->i_udquot = udqp;
2747
		ASSERT(XFS_IS_UQUOTA_ON(tp->t_mountp));
2748
		ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
Linus Torvalds's avatar
Linus Torvalds committed
2749 2750 2751 2752 2753 2754 2755 2756
		xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
	}
	if (gdqp) {
		xfs_dqlock(gdqp);
		XFS_DQHOLD(gdqp);
		xfs_dqunlock(gdqp);
		ASSERT(ip->i_gdquot == NULL);
		ip->i_gdquot = gdqp;
2757 2758 2759 2760
		ASSERT(XFS_IS_OQUOTA_ON(tp->t_mountp));
		ASSERT((XFS_IS_GQUOTA_ON(tp->t_mountp) ?
			ip->i_d.di_gid : ip->i_d.di_projid) ==
				be32_to_cpu(gdqp->q_core.d_id));
Linus Torvalds's avatar
Linus Torvalds committed
2761 2762 2763 2764 2765
		xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
	}
}

/* ------------- list stuff -----------------*/
2766
STATIC void
Linus Torvalds's avatar
Linus Torvalds committed
2767 2768 2769
xfs_qm_freelist_init(xfs_frlist_t *ql)
{
	ql->qh_next = ql->qh_prev = (xfs_dquot_t *) ql;
2770
	mutex_init(&ql->qh_lock);
Linus Torvalds's avatar
Linus Torvalds committed
2771 2772 2773 2774
	ql->qh_version = 0;
	ql->qh_nelems = 0;
}

2775
STATIC void
Linus Torvalds's avatar
Linus Torvalds committed
2776 2777 2778 2779
xfs_qm_freelist_destroy(xfs_frlist_t *ql)
{
	xfs_dquot_t	*dqp, *nextdqp;

2780
	mutex_lock(&ql->qh_lock);
Linus Torvalds's avatar
Linus Torvalds committed
2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792
	for (dqp = ql->qh_next;
	     dqp != (xfs_dquot_t *)ql; ) {
		xfs_dqlock(dqp);
		nextdqp = dqp->dq_flnext;
#ifdef QUOTADEBUG
		cmn_err(CE_DEBUG, "FREELIST destroy 0x%p", dqp);
#endif
		XQM_FREELIST_REMOVE(dqp);
		xfs_dqunlock(dqp);
		xfs_qm_dqdestroy(dqp);
		dqp = nextdqp;
	}
2793
	mutex_unlock(&ql->qh_lock);
Linus Torvalds's avatar
Linus Torvalds committed
2794 2795 2796 2797 2798
	mutex_destroy(&ql->qh_lock);

	ASSERT(ql->qh_nelems == 0);
}

2799
STATIC void
Linus Torvalds's avatar
Linus Torvalds committed
2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828
xfs_qm_freelist_insert(xfs_frlist_t *ql, xfs_dquot_t *dq)
{
	dq->dq_flnext = ql->qh_next;
	dq->dq_flprev = (xfs_dquot_t *)ql;
	ql->qh_next = dq;
	dq->dq_flnext->dq_flprev = dq;
	xfs_Gqm->qm_dqfreelist.qh_nelems++;
	xfs_Gqm->qm_dqfreelist.qh_version++;
}

void
xfs_qm_freelist_unlink(xfs_dquot_t *dq)
{
	xfs_dquot_t *next = dq->dq_flnext;
	xfs_dquot_t *prev = dq->dq_flprev;

	next->dq_flprev = prev;
	prev->dq_flnext = next;
	dq->dq_flnext = dq->dq_flprev = dq;
	xfs_Gqm->qm_dqfreelist.qh_nelems--;
	xfs_Gqm->qm_dqfreelist.qh_version++;
}

void
xfs_qm_freelist_append(xfs_frlist_t *ql, xfs_dquot_t *dq)
{
	xfs_qm_freelist_insert((xfs_frlist_t *)ql->qh_prev, dq);
}

2829
STATIC int
Linus Torvalds's avatar
Linus Torvalds committed
2830 2831 2832 2833 2834 2835
xfs_qm_dqhashlock_nowait(
	xfs_dquot_t *dqp)
{
	int locked;

	locked = mutex_trylock(&((dqp)->q_hash->qh_lock));
2836
	return locked;
Linus Torvalds's avatar
Linus Torvalds committed
2837 2838 2839 2840 2841 2842 2843 2844 2845
}

int
xfs_qm_freelist_lock_nowait(
	xfs_qm_t *xqm)
{
	int locked;

	locked = mutex_trylock(&(xqm->qm_dqfreelist.qh_lock));
2846
	return locked;
Linus Torvalds's avatar
Linus Torvalds committed
2847 2848
}

2849
STATIC int
Linus Torvalds's avatar
Linus Torvalds committed
2850 2851 2852 2853 2854 2855 2856
xfs_qm_mplist_nowait(
	xfs_mount_t	*mp)
{
	int locked;

	ASSERT(mp->m_quotainfo);
	locked = mutex_trylock(&(XFS_QI_MPLLOCK(mp)));
2857
	return locked;
Linus Torvalds's avatar
Linus Torvalds committed
2858
}