Release 4.11 fs/xfs/xfs_dquot.c

/*
 * Copyright (c) 2000-2003 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * 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.
 *
 * 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
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_shared.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "xfs_bmap_util.h"
#include "xfs_alloc.h"
#include "xfs_quota.h"
#include "xfs_error.h"
#include "xfs_trans.h"
#include "xfs_buf_item.h"
#include "xfs_trans_space.h"
#include "xfs_trans_priv.h"
#include "xfs_qm.h"
#include "xfs_cksum.h"
#include "xfs_trace.h"
#include "xfs_log.h"
#include "xfs_bmap_btree.h"

/*
 * Lock order:
 *
 * ip->i_lock
 *   qi->qi_tree_lock
 *     dquot->q_qlock (xfs_dqlock() and friends)
 *       dquot->q_flush (xfs_dqflock() and friends)
 *       qi->qi_lru_lock
 *
 * If two dquots need to be locked the order is user before group/project,
 * otherwise by the lowest id first, see xfs_dqlock2.
 */

#ifdef DEBUG

xfs_buftarg_t *xfs_dqerror_target;

int xfs_do_dqerror;

int xfs_dqreq_num;

int xfs_dqerror_mod = 33;
#endif


struct kmem_zone		*xfs_qm_dqtrxzone;

static struct kmem_zone		*xfs_qm_dqzone;


static struct lock_class_key xfs_dquot_group_class;

static struct lock_class_key xfs_dquot_project_class;

/*
 * This is called to free all the memory associated with a dquot
 */

void

xfs_qm_dqdestroy(
	xfs_dquot_t	*dqp)
{
	ASSERT(list_empty(&dqp->q_lru));

	kmem_free(dqp->q_logitem.qli_item.li_lv_shadow);
	mutex_destroy(&dqp->q_qlock);

	XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot);
	kmem_zone_free(xfs_qm_dqzone, dqp);
}

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1
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5
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/*
 * If default limits are in force, push them into the dquot now.
 * We overwrite the dquot limits only if they are zero and this
 * is not the root dquot.
 */

void

xfs_qm_adjust_dqlimits(
	struct xfs_mount	*mp,
	struct xfs_dquot	*dq)
{
	struct xfs_quotainfo	*q = mp->m_quotainfo;
	struct xfs_disk_dquot	*d = &dq->q_core;
	struct xfs_def_quota	*defq;
	int			prealloc = 0;

	ASSERT(d->d_id);
	defq = xfs_get_defquota(dq, q);

	if (defq->bsoftlimit && !d->d_blk_softlimit) {
		d->d_blk_softlimit = cpu_to_be64(defq->bsoftlimit);
		prealloc = 1;
	}
	if (defq->bhardlimit && !d->d_blk_hardlimit) {
		d->d_blk_hardlimit = cpu_to_be64(defq->bhardlimit);
		prealloc = 1;
	}
	if (defq->isoftlimit && !d->d_ino_softlimit)
		d->d_ino_softlimit = cpu_to_be64(defq->isoftlimit);
	if (defq->ihardlimit && !d->d_ino_hardlimit)
		d->d_ino_hardlimit = cpu_to_be64(defq->ihardlimit);
	if (defq->rtbsoftlimit && !d->d_rtb_softlimit)
		d->d_rtb_softlimit = cpu_to_be64(defq->rtbsoftlimit);
	if (defq->rtbhardlimit && !d->d_rtb_hardlimit)
		d->d_rtb_hardlimit = cpu_to_be64(defq->rtbhardlimit);

	if (prealloc)
		xfs_dquot_set_prealloc_limits(dq);
}

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38
17.84%
1
16.67%
Christoph Hellwig
24
11.27%
2
33.33%
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213
100.00%
6
100.00%

/*
 * Check the limits and timers of a dquot and start or reset timers
 * if necessary.
 * This gets called even when quota enforcement is OFF, which makes our
 * life a little less complicated. (We just don't reject any quota
 * reservations in that case, when enforcement is off).
 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when
 * enforcement's off.
 * In contrast, warnings are a little different in that they don't
 * 'automatically' get started when limits get exceeded.  They do
 * get reset to zero, however, when we find the count to be under
 * the soft limit (they are only ever set non-zero via userspace).
 */

void

xfs_qm_adjust_dqtimers(
	xfs_mount_t		*mp,
	xfs_disk_dquot_t	*d)
{
	ASSERT(d->d_id);

#ifdef DEBUG
	if (d->d_blk_hardlimit)
		ASSERT(be64_to_cpu(d->d_blk_softlimit) <=
		       be64_to_cpu(d->d_blk_hardlimit));
	if (d->d_ino_hardlimit)
		ASSERT(be64_to_cpu(d->d_ino_softlimit) <=
		       be64_to_cpu(d->d_ino_hardlimit));
	if (d->d_rtb_hardlimit)
		ASSERT(be64_to_cpu(d->d_rtb_softlimit) <=
		       be64_to_cpu(d->d_rtb_hardlimit));
#endif

	if (!d->d_btimer) {
		if ((d->d_blk_softlimit &&
		     (be64_to_cpu(d->d_bcount) >
		      be64_to_cpu(d->d_blk_softlimit))) ||
		    (d->d_blk_hardlimit &&
		     (be64_to_cpu(d->d_bcount) >
		      be64_to_cpu(d->d_blk_hardlimit)))) {
			d->d_btimer = cpu_to_be32(get_seconds() +
					mp->m_quotainfo->qi_btimelimit);
		} else {
			d->d_bwarns = 0;
		}
	} else {
		if ((!d->d_blk_softlimit ||
		     (be64_to_cpu(d->d_bcount) <=
		      be64_to_cpu(d->d_blk_softlimit))) &&
		    (!d->d_blk_hardlimit ||
		    (be64_to_cpu(d->d_bcount) <=
		     be64_to_cpu(d->d_blk_hardlimit)))) {
			d->d_btimer = 0;
		}
	}

	if (!d->d_itimer) {
		if ((d->d_ino_softlimit &&
		     (be64_to_cpu(d->d_icount) >
		      be64_to_cpu(d->d_ino_softlimit))) ||
		    (d->d_ino_hardlimit &&
		     (be64_to_cpu(d->d_icount) >
		      be64_to_cpu(d->d_ino_hardlimit)))) {
			d->d_itimer = cpu_to_be32(get_seconds() +
					mp->m_quotainfo->qi_itimelimit);
		} else {
			d->d_iwarns = 0;
		}
	} else {
		if ((!d->d_ino_softlimit ||
		     (be64_to_cpu(d->d_icount) <=
		      be64_to_cpu(d->d_ino_softlimit)))  &&
		    (!d->d_ino_hardlimit ||
		     (be64_to_cpu(d->d_icount) <=
		      be64_to_cpu(d->d_ino_hardlimit)))) {
			d->d_itimer = 0;
		}
	}

	if (!d->d_rtbtimer) {
		if ((d->d_rtb_softlimit &&
		     (be64_to_cpu(d->d_rtbcount) >
		      be64_to_cpu(d->d_rtb_softlimit))) ||
		    (d->d_rtb_hardlimit &&
		     (be64_to_cpu(d->d_rtbcount) >
		      be64_to_cpu(d->d_rtb_hardlimit)))) {
			d->d_rtbtimer = cpu_to_be32(get_seconds() +
					mp->m_quotainfo->qi_rtbtimelimit);
		} else {
			d->d_rtbwarns = 0;
		}
	} else {
		if ((!d->d_rtb_softlimit ||
		     (be64_to_cpu(d->d_rtbcount) <=
		      be64_to_cpu(d->d_rtb_softlimit))) &&
		    (!d->d_rtb_hardlimit ||
		     (be64_to_cpu(d->d_rtbcount) <=
		      be64_to_cpu(d->d_rtb_hardlimit)))) {
			d->d_rtbtimer = 0;
		}
	}
}

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Christoph Hellwig
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Nathan Scott
160
30.95%
2
22.22%
Mitsuo Hayasaka
12
2.32%
1
11.11%
Andi Kleen
4
0.77%
1
11.11%
Total
517
100.00%
9
100.00%

/*
 * initialize a buffer full of dquots and log the whole thing
 */

STATIC void

xfs_qm_init_dquot_blk(
	xfs_trans_t	*tp,
	xfs_mount_t	*mp,
	xfs_dqid_t	id,
	uint		type,
	xfs_buf_t	*bp)
{
	struct xfs_quotainfo	*q = mp->m_quotainfo;
	xfs_dqblk_t	*d;
	xfs_dqid_t	curid;
	int		i;

	ASSERT(tp);
	ASSERT(xfs_buf_islocked(bp));

	d = bp->b_addr;

	/*
         * ID of the first dquot in the block - id's are zero based.
         */
	curid = id - (id % q->qi_dqperchunk);
	memset(d, 0, BBTOB(q->qi_dqchunklen));
	for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++) {
		d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
		d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
		d->dd_diskdq.d_id = cpu_to_be32(curid);
		d->dd_diskdq.d_flags = type;
		if (xfs_sb_version_hascrc(&mp->m_sb)) {
			uuid_copy(&d->dd_uuid, &mp->m_sb.sb_meta_uuid);
			xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk),
					 XFS_DQUOT_CRC_OFF);
		}
	}

	xfs_trans_dquot_buf(tp, bp,
			    (type & XFS_DQ_USER ? XFS_BLF_UDQUOT_BUF :
			    ((type & XFS_DQ_PROJ) ? XFS_BLF_PDQUOT_BUF :
			     XFS_BLF_GDQUOT_BUF)));
	xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1);
}

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9.62%
3
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Nathan Scott
14
5.86%
2
16.67%
Eric Sandeen
3
1.26%
1
8.33%
Chandra Seetharaman
2
0.84%
1
8.33%
Total
239
100.00%
12
100.00%

/*
 * Initialize the dynamic speculative preallocation thresholds. The lo/hi
 * watermarks correspond to the soft and hard limits by default. If a soft limit
 * is not specified, we use 95% of the hard limit.
 */

void

xfs_dquot_set_prealloc_limits(struct xfs_dquot *dqp)
{
	__uint64_t space;

	dqp->q_prealloc_hi_wmark = be64_to_cpu(dqp->q_core.d_blk_hardlimit);
	dqp->q_prealloc_lo_wmark = be64_to_cpu(dqp->q_core.d_blk_softlimit);
	if (!dqp->q_prealloc_lo_wmark) {
		dqp->q_prealloc_lo_wmark = dqp->q_prealloc_hi_wmark;
		do_div(dqp->q_prealloc_lo_wmark, 100);
		dqp->q_prealloc_lo_wmark *= 95;
	}

	space = dqp->q_prealloc_hi_wmark;

	do_div(space, 100);
	dqp->q_low_space[XFS_QLOWSP_1_PCNT] = space;
	dqp->q_low_space[XFS_QLOWSP_3_PCNT] = space * 3;
	dqp->q_low_space[XFS_QLOWSP_5_PCNT] = space * 5;
}

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/*
 * Allocate a block and fill it with dquots.
 * This is called when the bmapi finds a hole.
 */

STATIC int

xfs_qm_dqalloc(
	xfs_trans_t	**tpp,
	xfs_mount_t	*mp,
	xfs_dquot_t	*dqp,
	xfs_inode_t	*quotip,
	xfs_fileoff_t	offset_fsb,
	xfs_buf_t	**O_bpp)
{
	xfs_fsblock_t	firstblock;
	struct xfs_defer_ops dfops;
	xfs_bmbt_irec_t map;
	int		nmaps, error;
	xfs_buf_t	*bp;
	xfs_trans_t	*tp = *tpp;

	ASSERT(tp != NULL);

	trace_xfs_dqalloc(dqp);

	/*
         * Initialize the bmap freelist prior to calling bmapi code.
         */
	xfs_defer_init(&dfops, &firstblock);
	xfs_ilock(quotip, XFS_ILOCK_EXCL);
	/*
         * Return if this type of quotas is turned off while we didn't
         * have an inode lock
         */
	if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
		xfs_iunlock(quotip, XFS_ILOCK_EXCL);
		return -ESRCH;
	}

	xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL);
	nmaps = 1;
	error = xfs_bmapi_write(tp, quotip, offset_fsb,
				XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA,
				&firstblock, XFS_QM_DQALLOC_SPACE_RES(mp),
				&map, &nmaps, &dfops);
	if (error)
		goto error0;
	ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
	ASSERT(nmaps == 1);
	ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
	       (map.br_startblock != HOLESTARTBLOCK));

	/*
         * Keep track of the blkno to save a lookup later
         */
	dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);

	/* now we can just get the buffer (there's nothing to read yet) */
	bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
			       dqp->q_blkno,
			       mp->m_quotainfo->qi_dqchunklen,
			       0);
	if (!bp) {
		error = -ENOMEM;
		goto error1;
	}
	bp->b_ops = &xfs_dquot_buf_ops;

	/*
         * Make a chunk of dquots out of this buffer and log
         * the entire thing.
         */
	xfs_qm_init_dquot_blk(tp, mp, be32_to_cpu(dqp->q_core.d_id),
			      dqp->dq_flags & XFS_DQ_ALLTYPES, bp);

	/*
         * xfs_defer_finish() may commit the current transaction and
         * start a second transaction if the freelist is not empty.
         *
         * Since we still want to modify this buffer, we need to
         * ensure that the buffer is not released on commit of
         * the first transaction and ensure the buffer is added to the
         * second transaction.
         *
         * If there is only one transaction then don't stop the buffer
         * from being released when it commits later on.
         */

	xfs_trans_bhold(tp, bp);

	error = xfs_defer_finish(tpp, &dfops, NULL);
	if (error)
		goto error1;

	/* Transaction was committed? */
	if (*tpp != tp) {
		tp = *tpp;
		xfs_trans_bjoin(tp, bp);
	} else {
		xfs_trans_bhold_release(tp, bp);
	}

	*O_bpp = bp;
	return 0;

error1:
	xfs_defer_cancel(&dfops);
error0:
	xfs_iunlock(quotip, XFS_ILOCK_EXCL);

	return error;
}

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22
5.90%
5
29.41%
Darrick J. Wong
11
2.95%
2
11.76%
Chandra Seetharaman
10
2.68%
2
11.76%
Eric Sandeen
10
2.68%
1
5.88%
Nathan Scott
1
0.27%
1
5.88%
Total
373
100.00%
17
100.00%


STATIC int

xfs_qm_dqrepair(
	struct xfs_mount	*mp,
	struct xfs_trans	*tp,
	struct xfs_dquot	*dqp,
	xfs_dqid_t		firstid,
	struct xfs_buf		**bpp)
{
	int			error;
	struct xfs_disk_dquot	*ddq;
	struct xfs_dqblk	*d;
	int			i;

	/*
         * Read the buffer without verification so we get the corrupted
         * buffer returned to us. make sure we verify it on write, though.
         */
	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, dqp->q_blkno,
				   mp->m_quotainfo->qi_dqchunklen,
				   0, bpp, NULL);

	if (error) {
		ASSERT(*bpp == NULL);
		return error;
	}
	(*bpp)->b_ops = &xfs_dquot_buf_ops;

	ASSERT(xfs_buf_islocked(*bpp));
	d = (struct xfs_dqblk *)(*bpp)->b_addr;

	/* Do the actual repair of dquots in this buffer */
	for (i = 0; i < mp->m_quotainfo->qi_dqperchunk; i++) {
		ddq = &d[i].dd_diskdq;
		error = xfs_dqcheck(mp, ddq, firstid + i,
				       dqp->dq_flags & XFS_DQ_ALLTYPES,
				       XFS_QMOPT_DQREPAIR, "xfs_qm_dqrepair");
		if (error) {
			/* repair failed, we're screwed */
			xfs_trans_brelse(tp, *bpp);
			return -EIO;
		}
	}

	return 0;
}

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201
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/*
 * Maps a dquot to the buffer containing its on-disk version.
 * This returns a ptr to the buffer containing the on-disk dquot
 * in the bpp param, and a ptr to the on-disk dquot within that buffer
 */

STATIC int

xfs_qm_dqtobp(
	xfs_trans_t		**tpp,
	xfs_dquot_t		*dqp,
	xfs_disk_dquot_t	**O_ddpp,
	xfs_buf_t		**O_bpp,
	uint			flags)
{
	struct xfs_bmbt_irec	map;
	int			nmaps = 1, error;
	struct xfs_buf		*bp;
	struct xfs_inode	*quotip;
	struct xfs_mount	*mp = dqp->q_mount;
	xfs_dqid_t		id = be32_to_cpu(dqp->q_core.d_id);
	struct xfs_trans	*tp = (tpp ? *tpp : NULL);
	uint			lock_mode;

	quotip = xfs_quota_inode(dqp->q_mount, dqp->dq_flags);
	dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;

	lock_mode = xfs_ilock_data_map_shared(quotip);
	if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
		/*
                 * Return if this type of quotas is turned off while we
                 * didn't have the quota inode lock.
                 */
		xfs_iunlock(quotip, lock_mode);
		return -ESRCH;
	}

	/*
         * Find the block map; no allocations yet
         */
	error = xfs_bmapi_read(quotip, dqp->q_fileoffset,
			       XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0);

	xfs_iunlock(quotip, lock_mode);
	if (error)
		return error;

	ASSERT(nmaps == 1);
	ASSERT(map.br_blockcount == 1);

	/*
         * Offset of dquot in the (fixed sized) dquot chunk.
         */
	dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) *
		sizeof(xfs_dqblk_t);

	ASSERT(map.br_startblock != DELAYSTARTBLOCK);
	if (map.br_startblock == HOLESTARTBLOCK) {
		/*
                 * We don't allocate unless we're asked to
                 */
		if (!(flags & XFS_QMOPT_DQALLOC))
			return -ENOENT;

		ASSERT(tp);
		error = xfs_qm_dqalloc(tpp, mp, dqp, quotip,
					dqp->q_fileoffset, &bp);
		if (error)
			return error;
		tp = *tpp;
	} else {
		trace_xfs_dqtobp_read(dqp);

		/*
                 * store the blkno etc so that we don't have to do the
                 * mapping all the time
                 */
		dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);

		error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
					   dqp->q_blkno,
					   mp->m_quotainfo->qi_dqchunklen,
					   0, &bp, &xfs_dquot_buf_ops);

		if (error == -EFSCORRUPTED && (flags & XFS_QMOPT_DQREPAIR)) {
			xfs_dqid_t firstid = (xfs_dqid_t)map.br_startoff *
						mp->m_quotainfo->qi_dqperchunk;
			ASSERT(bp == NULL);
			error = xfs_qm_dqrepair(mp, tp, dqp, firstid, &bp);
		}

		if (error) {
			ASSERT(bp == NULL);
			return error;
		}
	}

	ASSERT(xfs_buf_islocked(bp));
	*O_bpp = bp;
	*O_ddpp = bp->b_addr + dqp->q_bufoffset;

	return 0;
}


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Christoph Hellwig
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15.38%
6
37.50%
Timothy Shimmin
20
4.52%
1
6.25%
Chandra Seetharaman
18
4.07%
3
18.75%
Eric Sandeen
13
2.94%
1
6.25%
Nathan Scott
1
0.23%
1
6.25%
Total
442
100.00%
16
100.00%

/*
 * Read in the ondisk dquot using dqtobp() then copy it to an incore version,
 * and release the buffer immediately.
 *
 * If XFS_QMOPT_DQALLOC is set, allocate a dquot on disk if it needed.
 */

int

xfs_qm_dqread(
	struct xfs_mount	*mp,
	xfs_dqid_t		id,
	uint			type,
	uint			flags,
	struct xfs_dquot	**O_dqpp)
{
	struct xfs_dquot	*dqp;
	struct xfs_disk_dquot	*ddqp;
	struct xfs_buf		*bp;
	struct xfs_trans	*tp = NULL;
	int			error;

	dqp = kmem_zone_zalloc(xfs_qm_dqzone, KM_SLEEP);

	dqp->dq_flags = type;
	dqp->q_core.d_id = cpu_to_be32(id);
	dqp->q_mount = mp;
	INIT_LIST_HEAD(&dqp->q_lru);
	mutex_init(&dqp->q_qlock);
	init_waitqueue_head(&dqp->q_pinwait);

	/*
         * Because we want to use a counting completion, complete
         * the flush completion once to allow a single access to
         * the flush completion without blocking.
         */
	init_completion(&dqp->q_flush);
	complete(&dqp->q_flush);

	/*
         * Make sure group quotas have a different lock class than user
         * quotas.
         */
	switch (type) {
	case XFS_DQ_USER:
		/* uses the default lock class */
		break;
	case XFS_DQ_GROUP:
		lockdep_set_class(&dqp->q_qlock, &xfs_dquot_group_class);
		break;
	case XFS_DQ_PROJ:
		lockdep_set_class(&dqp->q_qlock, &xfs_dquot_project_class);
		break;
	default:
		ASSERT(0);
		break;
	}

	XFS_STATS_INC(mp, xs_qm_dquot);

	trace_xfs_dqread(dqp);

	if (flags & XFS_QMOPT_DQALLOC) {
		error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_dqalloc,
				XFS_QM_DQALLOC_SPACE_RES(mp), 0, 0, &tp);
		if (error)
			goto error0;
	}

	/*
         * get a pointer to the on-disk dquot and the buffer containing it
         * dqp already knows its own type (GROUP/USER).
         */
	error = xfs_qm_dqtobp(&tp, dqp, &ddqp, &bp, flags);
	if (error) {
		/*
                 * This can happen if quotas got turned off (ESRCH),
                 * or if the dquot didn't exist on disk and we ask to
                 * allocate (ENOENT).
                 */
		trace_xfs_dqread_fail(dqp);
		goto error1;
	}

	/* copy everything from disk dquot to the incore dquot */
	memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t));
	xfs_qm_dquot_logitem_init(dqp);

	/*
         * Reservation counters are defined as reservation plus current usage
         * to avoid having to add every time.
         */
	dqp->q_res_bcount = be64_to_cpu(ddqp->d_bcount);
	dqp->q_res_icount = be64_to_cpu(ddqp->d_icount);
	dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount);

	/* initialize the dquot speculative prealloc thresholds */
	xfs_dquot_set_prealloc_limits(dqp);

	/* Mark the buf so that this will stay incore a little longer */
	xfs_buf_set_ref(bp, XFS_DQUOT_REF);

	/*
         * We got the buffer with a xfs_trans_read_buf() (in dqtobp())
         * So we need to release with xfs_trans_brelse().
         * The strategy here is identical to that of inodes; we lock
         * the dquot in xfs_qm_dqget() before making it accessible to
         * others. This is because dquots, like inodes, need a good level of
         * concurrency, and we don't want to take locks on the entire buffers
         * for dquot accesses.
         * Note also that the dquot buffer may even be dirty at this point, if
         * this particular dquot was repaired. We still aren't afraid to
         * brelse it because we have the changes incore.
         */
	ASSERT(xfs_buf_islocked(bp));
	xfs_trans_brelse(tp, bp);

	if (tp) {
		error = xfs_trans_commit(tp);
		if (error)
			goto error0;
	}

	*O_dqpp = dqp;
	return error;

error1:
	if (tp)
		xfs_trans_cancel(tp);
error0:
	xfs_qm_dqdestroy(dqp);
	*O_dqpp = NULL;
	return error;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
350
87.72%
9
60.00%
Dave Chinner
35
8.77%
1
6.67%
Brian Foster
7
1.75%
2
13.33%
Jie Liu
4
1.00%
1
6.67%
Bill O'Donnell
2
0.50%
1
6.67%
Timothy Shimmin
1
0.25%
1
6.67%
Total
399
100.00%
15
100.00%

/*
 * Advance to the next id in the current chunk, or if at the
 * end of the chunk, skip ahead to first id in next allocated chunk
 * using the SEEK_DATA interface.
 */

static int

xfs_dq_get_next_id(
	xfs_mount_t		*mp,
	uint			type,
	xfs_dqid_t		*id,
	loff_t			eof)
{
	struct xfs_inode	*quotip;
	xfs_fsblock_t		start;
	loff_t			offset;
	uint			lock;
	xfs_dqid_t		next_id;
	int			error = 0;

	/* Simple advance */
	next_id = *id + 1;

	/* If we'd wrap past the max ID, stop */
	if (next_id < *id)
		return -ENOENT;

	/* If new ID is within the current chunk, advancing it sufficed */
	if (next_id % mp->m_quotainfo->qi_dqperchunk) {
		*id = next_id;
		return 0;
	}

	/* Nope, next_id is now past the current chunk, so find the next one */
	start = (xfs_fsblock_t)next_id / mp->m_quotainfo->qi_dqperchunk;

	quotip = xfs_quota_inode(mp, type);
	lock = xfs_ilock_data_map_shared(quotip);

	offset = __xfs_seek_hole_data(VFS_I(quotip), XFS_FSB_TO_B(mp, start),
				      eof, SEEK_DATA);
	if (offset < 0)
		error = offset;

	xfs_iunlock(quotip, lock);

	/* -ENXIO is essentially "no more data" */
	if (error)
		return (error == -ENXIO ? -ENOENT: error);

	/* Convert next data offset back to a quota id */
	*id = XFS_B_TO_FSB(mp, offset) * mp->m_quotainfo->qi_dqperchunk;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Sandeen
188
99.47%
2
66.67%
Eryu Guan
1
0.53%
1
33.33%
Total
189
100.00%
3
100.00%

/*
 * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a
 * a locked dquot, doing an allocation (if requested) as needed.
 * When both an inode and an id are given, the inode's id takes precedence.
 * That is, if the id changes while we don't hold the ilock inside this
 * function, the new dquot is returned, not necessarily the one requested
 * in the id argument.
 */

int

xfs_qm_dqget(
	xfs_mount_t	*mp,
	xfs_inode_t	*ip,	  /* locked inode (optional) */
	xfs_dqid_t	id,	  /* uid/projid/gid depending on type */
	uint		type,	  /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */
	uint		flags,	  /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
	xfs_dquot_t	**O_dqpp) /* OUT : locked incore dquot */
{
	struct xfs_quotainfo	*qi = mp->m_quotainfo;
	struct radix_tree_root *tree = xfs_dquot_tree(qi, type);
	struct xfs_dquot	*dqp;
	loff_t			eof = 0;
	int			error;

	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
	if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) ||
	    (! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) ||
	    (! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) {
		return -ESRCH;
	}

#ifdef DEBUG
	if (xfs_do_dqerror) {
		if ((xfs_dqerror_target == mp->m_ddev_targp) &&
		    (xfs_dqreq_num++ % xfs_dqerror_mod) == 0) {
			xfs_debug(mp, "Returning error in dqget");
			return -EIO;
		}
	}

	ASSERT(type == XFS_DQ_USER ||
	       type == XFS_DQ_PROJ ||
	       type == XFS_DQ_GROUP);
	if (ip) {
		ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
		ASSERT(xfs_inode_dquot(ip, type) == NULL);
	}
#endif

	/* Get the end of the quota file if we need it */
	if (flags & XFS_QMOPT_DQNEXT) {
		struct xfs_inode	*quotip;
		xfs_fileoff_t		last;
		uint			lock_mode;

		quotip = xfs_quota_inode(mp, type);
		lock_mode = xfs_ilock_data_map_shared(quotip);
		error = xfs_bmap_last_offset(quotip, &last, XFS_DATA_FORK);
		xfs_iunlock(quotip, lock_mode);
		if (error)
			return error;
		eof = XFS_FSB_TO_B(mp, last);
	}

restart:
	mutex_lock(&qi->qi_tree_lock);
	dqp = radix_tree_lookup(tree, id);
	if (dqp) {
		xfs_dqlock(dqp);
		if (dqp->dq_flags & XFS_DQ_FREEING) {
			xfs_dqunlock(dqp);
			mutex_unlock(&qi->qi_tree_lock);
			trace_xfs_dqget_freeing(dqp);
			delay(1);
			goto restart;
		}

		/* uninit / unused quota found in radix tree, keep looking  */
		if (flags & XFS_QMOPT_DQNEXT) {
			if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
				xfs_dqunlock(dqp);
				mutex_unlock(&qi->qi_tree_lock);
				error = xfs_dq_get_next_id(mp, type, &id, eof);
				if (error)
					return error;
				goto restart;
			}
		}

		dqp->q_nrefs++;
		mutex_unlock(&qi->qi_tree_lock);

		trace_xfs_dqget_hit(dqp);
		XFS_STATS_INC(mp, xs_qm_dqcachehits);
		*O_dqpp = dqp;
		return 0;
	}
	mutex_unlock(&qi->qi_tree_lock);
	XFS_STATS_INC(mp, xs_qm_dqcachemisses);

	/*
         * Dquot cache miss. We don't want to keep the inode lock across
         * a (potential) disk read. Also we don't want to deal with the lock
         * ordering between quotainode and this inode. OTOH, dropping the inode
         * lock here means dealing with a chown that can happen before
         * we re-acquire the lock.
         */
	if (ip)
		xfs_iunlock(ip, XFS_ILOCK_EXCL);

	error = xfs_qm_dqread(mp, id, type, flags, &dqp);

	if (ip)
		xfs_ilock(ip, XFS_ILOCK_EXCL);

	/* If we are asked to find next active id, keep looking */
	if (error == -ENOENT && (flags & XFS_QMOPT_DQNEXT)) {
		error = xfs_dq_get_next_id(mp, type, &id, eof);
		if (!error)
			goto restart;
	}

	if (error)
		return error;

	if (ip) {
		/*
                 * A dquot could be attached to this inode by now, since
                 * we had dropped the ilock.
                 */
		if (xfs_this_quota_on(mp, type)) {
			struct xfs_dquot	*dqp1;

			dqp1 = xfs_inode_dquot(ip, type);
			if (dqp1) {
				xfs_qm_dqdestroy(dqp);
				dqp = dqp1;
				xfs_dqlock(dqp);
				goto dqret;
			}
		} else {
			/* inode stays locked on return */
			xfs_qm_dqdestroy(dqp);
			return -ESRCH;
		}
	}

	mutex_lock(&qi->qi_tree_lock);
	error = radix_tree_insert(tree, id, dqp);
	if (unlikely(error)) {
		WARN_ON(error != -EEXIST);

		/*
                 * Duplicate found. Just throw away the new dquot and start
                 * over.
                 */
		mutex_unlock(&qi->qi_tree_lock);
		trace_xfs_dqget_dup(dqp);
		xfs_qm_dqdestroy(dqp);
		XFS_STATS_INC(mp, xs_qm_dquot_dups);
		goto restart;
	}

	/*
         * We return a locked dquot to the caller, with a reference taken
         */
	xfs_dqlock(dqp);
	dqp->q_nrefs = 1;

	qi->qi_dquots++;
	mutex_unlock(&qi->qi_tree_lock);

	/* If we are asked to find next active id, keep looking */
	if (flags & XFS_QMOPT_DQNEXT) {
		if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
			xfs_qm_dqput(dqp);
			error = xfs_dq_get_next_id(mp, type, &id, eof);
			if (error)
				return error;
			goto restart;
		}
	}

 dqret:
	ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL));
	trace_xfs_dqget_miss(dqp);
	*O_dqpp = dqp;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
492
64.40%
11
55.00%
Eric Sandeen
216
28.27%
1
5.00%
Nathan Scott
18
2.36%
1
5.00%
Chandra Seetharaman
17
2.23%
2
10.00%
Dave Chinner
13
1.70%
3
15.00%
Bill O'Donnell
6
0.79%
1
5.00%
Stephen Lord
2
0.26%
1
5.00%
Total
764
100.00%
20
100.00%

/*
 * Release a reference to the dquot (decrement ref-count) and unlock it.
 *
 * If there is a group quota attached to this dquot, carefully release that
 * too without tripping over deadlocks'n'stuff.
 */

void

xfs_qm_dqput(
	struct xfs_dquot	*dqp)
{
	ASSERT(dqp->q_nrefs > 0);
	ASSERT(XFS_DQ_IS_LOCKED(dqp));

	trace_xfs_dqput(dqp);

	if (--dqp->q_nrefs == 0) {
		struct xfs_quotainfo	*qi = dqp->q_mount->m_quotainfo;
		trace_xfs_dqput_free(dqp);

		if (list_lru_add(&qi->qi_lru, &dqp->q_lru))
			XFS_STATS_INC(dqp->q_mount, xs_qm_dquot_unused);
	}
	xfs_dqunlock(dqp);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
48
54.55%
2
50.00%
Dave Chinner
36
40.91%
1
25.00%
Bill O'Donnell
4
4.55%
1
25.00%
Total
88
100.00%
4
100.00%

/*
 * Release a dquot. Flush it if dirty, then dqput() it.
 * dquot must not be locked.
 */

void

xfs_qm_dqrele(
	xfs_dquot_t	*dqp)
{
	if (!dqp)
		return;

	trace_xfs_dqrele(dqp);

	xfs_dqlock(dqp);
	/*
         * We don't care to flush it if the dquot is dirty here.
         * That will create stutters that we want to avoid.
         * Instead we do a delayed write when we try to reclaim
         * a dirty dquot. Also xfs_sync will take part of the burden...
         */
	xfs_qm_dqput(dqp);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
31
100.00%
3
100.00%
Total
31
100.00%
3
100.00%

/*
 * This is the dquot flushing I/O completion routine.  It is called
 * from interrupt level when the buffer containing the dquot is
 * flushed to disk.  It is responsible for removing the dquot logitem
 * from the AIL if it has not been re-logged, and unlocking the dquot's
 * flush lock. This behavior is very similar to that of inodes..
 */

STATIC void

xfs_qm_dqflush_done(
	struct xfs_buf		*bp,
	struct xfs_log_item	*lip)
{
	xfs_dq_logitem_t	*qip = (struct xfs_dq_logitem *)lip;
	xfs_dquot_t		*dqp = qip->qli_dquot;
	struct xfs_ail		*ailp = lip->li_ailp;

	/*
         * We only want to pull the item from the AIL if its
         * location in the log has not changed since we started the flush.
         * Thus, we only bother if the dquot's lsn has
         * not changed. First we check the lsn outside the lock
         * since it's cheaper, and then we recheck while
         * holding the lock before removing the dquot from the AIL.
         */
	if ((lip->li_flags & XFS_LI_IN_AIL) &&
	    lip->li_lsn == qip->qli_flush_lsn) {

		/* xfs_trans_ail_delete() drops the AIL lock. */
		spin_lock(&ailp->xa_lock);
		if (lip->li_lsn == qip->qli_flush_lsn)
			xfs_trans_ail_delete(ailp, lip, SHUTDOWN_CORRUPT_INCORE);
		else
			spin_unlock(&ailp->xa_lock);
	}

	/*
         * Release the dq's flush lock since we're done with it.
         */
	xfs_dqfunlock(dqp);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
106
98.15%
1
50.00%
Dave Chinner
2
1.85%
1
50.00%
Total
108
100.00%
2
100.00%

/*
 * Write a modified dquot to disk.
 * The dquot must be locked and the flush lock too taken by caller.
 * The flush lock will not be unlocked until the dquot reaches the disk,
 * but the dquot is free to be unlocked and modified by the caller
 * in the interim. Dquot is still locked on return. This behavior is
 * identical to that of inodes.
 */

int

xfs_qm_dqflush(
	struct xfs_dquot	*dqp,
	struct xfs_buf		**bpp)
{
	struct xfs_mount	*mp = dqp->q_mount;
	struct xfs_buf		*bp;
	struct xfs_disk_dquot	*ddqp;
	int			error;

	ASSERT(XFS_DQ_IS_LOCKED(dqp));
	ASSERT(!completion_done(&dqp->q_flush));

	trace_xfs_dqflush(dqp);

	*bpp = NULL;

	xfs_qm_dqunpin_wait(dqp);

	/*
         * This may have been unpinned because the filesystem is shutting
         * down forcibly. If that's the case we must not write this dquot
         * to disk, because the log record didn't make it to disk.
         *
         * We also have to remove the log item from the AIL in this case,
         * as we wait for an emptry AIL as part of the unmount process.
         */
	if (XFS_FORCED_SHUTDOWN(mp)) {
		struct xfs_log_item	*lip = &dqp->q_logitem.qli_item;
		dqp->dq_flags &= ~XFS_DQ_DIRTY;

		xfs_trans_ail_remove(lip, SHUTDOWN_CORRUPT_INCORE);

		error = -EIO;
		goto out_unlock;
	}

	/*
         * Get the buffer containing the on-disk dquot
         */
	error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
				   mp->m_quotainfo->qi_dqchunklen, 0, &bp,
				   &xfs_dquot_buf_ops);
	if (error)
		goto out_unlock;

	/*
         * Calculate the location of the dquot inside the buffer.
         */
	ddqp = bp->b_addr + dqp->q_bufoffset;

	/*
         * A simple sanity check in case we got a corrupted dquot..
         */
	error = xfs_dqcheck(mp, &dqp->q_core, be32_to_cpu(ddqp->d_id), 0,
			   XFS_QMOPT_DOWARN, "dqflush (incore copy)");
	if (error) {
		xfs_buf_relse(bp);
		xfs_dqfunlock(dqp);
		xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
		return -EIO;
	}

	/* This is the only portion of data that needs to persist */
	memcpy(ddqp, &dqp->q_core, sizeof(xfs_disk_dquot_t));

	/*
         * Clear the dirty field and remember the flush lsn for later use.
         */
	dqp->dq_flags &= ~XFS_DQ_DIRTY;

	xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn,
					&dqp->q_logitem.qli_item.li_lsn);

	/*
         * copy the lsn into the on-disk dquot now while we have the in memory
         * dquot here. This can't be done later in the write verifier as we
         * can't get access to the log item at that point in time.
         *
         * We also calculate the CRC here so that the on-disk dquot in the
         * buffer always has a valid CRC. This ensures there is no possibility
         * of a dquot without an up-to-date CRC getting to disk.
         */
	if (xfs_sb_version_hascrc(&mp->m_sb)) {
		struct xfs_dqblk *dqb = (struct xfs_dqblk *)ddqp;

		dqb->dd_lsn = cpu_to_be64(dqp->q_logitem.qli_item.li_lsn);
		xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk),
				 XFS_DQUOT_CRC_OFF);
	}

	/*
         * Attach an iodone routine so that we can remove this dquot from the
         * AIL and release the flush lock once the dquot is synced to disk.
         */
	xfs_buf_attach_iodone(bp, xfs_qm_dqflush_done,
				  &dqp->q_logitem.qli_item);

	/*
         * If the buffer is pinned then push on the log so we won't
         * get stuck waiting in the write for too long.
         */
	if (xfs_buf_ispinned(bp)) {
		trace_xfs_dqflush_force(dqp);
		xfs_log_force(mp, 0);
	}

	trace_xfs_dqflush_done(dqp);
	*bpp = bp;
	return 0;

out_unlock:
	xfs_dqfunlock(dqp);
	return -EIO;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
330
85.71%
8
34.78%
Dave Chinner
35
9.09%
7
30.43%
David Chinner
11
2.86%
2
8.70%
Nathan Scott
4
1.04%
2
8.70%
Chandra Seetharaman
3
0.78%
2
8.70%
Brian Foster
1
0.26%
1
4.35%
Donald Douwsma
1
0.26%
1
4.35%
Total
385
100.00%
23
100.00%

/*
 * Lock two xfs_dquot structures.
 *
 * To avoid deadlocks we always lock the quota structure with
 * the lowerd id first.
 */

void

xfs_dqlock2(
	xfs_dquot_t	*d1,
	xfs_dquot_t	*d2)
{
	if (d1 && d2) {
		ASSERT(d1 != d2);
		if (be32_to_cpu(d1->q_core.d_id) >
		    be32_to_cpu(d2->q_core.d_id)) {
			mutex_lock(&d2->q_qlock);
			mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
		} else {
			mutex_lock(&d1->q_qlock);
			mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
		}
	} else if (d1) {
		mutex_lock(&d1->q_qlock);
	} else if (d2) {
		mutex_lock(&d2->q_qlock);
	}
}

Contributors
Person
Tokens
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Christoph Hellwig
119
100.00%
3
100.00%
Total
119
100.00%
3
100.00%


int __init

xfs_qm_init(void)
{
	xfs_qm_dqzone =
		kmem_zone_init(sizeof(struct xfs_dquot), "xfs_dquot");
	if (!xfs_qm_dqzone)
		goto out;

	xfs_qm_dqtrxzone =
		kmem_zone_init(sizeof(struct xfs_dquot_acct), "xfs_dqtrx");
	if (!xfs_qm_dqtrxzone)
		goto out_free_dqzone;

	return 0;

out_free_dqzone:
	kmem_zone_destroy(xfs_qm_dqzone);
out:
	return -ENOMEM;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
66
100.00%
1
100.00%
Total
66
100.00%
1
100.00%


void

xfs_qm_exit(void)
{
	kmem_zone_destroy(xfs_qm_dqtrxzone);
	kmem_zone_destroy(xfs_qm_dqzone);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
2804
63.00%
33
33.00%
Dave Chinner
481
10.81%
27
27.00%
Eric Sandeen
431
9.68%
5
5.00%
Nathan Scott
309
6.94%
7
7.00%
Brian Foster
167
3.75%
4
4.00%
Timothy Shimmin
65
1.46%
1
1.00%
Chandra Seetharaman
50
1.12%
8
8.00%
Carlos Maiolino
38
0.85%
1
1.00%
Russell Cattelan
32
0.72%
1
1.00%
Bill O'Donnell
21
0.47%
1
1.00%
Darrick J. Wong
14
0.31%
3
3.00%
Mitsuo Hayasaka
12
0.27%
1
1.00%
David Chinner
11
0.25%
2
2.00%
Stephen Lord
5
0.11%
1
1.00%
Jie Liu
4
0.09%
1
1.00%
Andi Kleen
4
0.09%
1
1.00%
Michael Hayes
1
0.02%
1
1.00%
Donald Douwsma
1
0.02%
1
1.00%
Eryu Guan
1
0.02%
1
1.00%
Total
4451
100.00%
100
100.00%
Directory: fs/xfs

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