xfs_trans_dquot.c

linux-2.6.15.6

/*
 * Copyright (c) 2000-2002 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_bit.h"
#include "xfs_log.h"
#include "xfs_inum.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"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_ialloc.h"
#include "xfs_itable.h"
#include "xfs_btree.h"
#include "xfs_bmap.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#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_priv.h"
#include "xfs_qm.h"

STATIC void	xfs_trans_alloc_dqinfo(xfs_trans_t *);

/*
 * Add the locked dquot to the transaction.
 * The dquot must be locked, and it cannot be associated with any
 * transaction.
 */
void
xfs_trans_dqjoin(
	xfs_trans_t	*tp,
	xfs_dquot_t	*dqp)
{
	xfs_dq_logitem_t    *lp;

	ASSERT(! XFS_DQ_IS_ADDEDTO_TRX(tp, dqp));
	ASSERT(XFS_DQ_IS_LOCKED(dqp));
	ASSERT(XFS_DQ_IS_LOGITEM_INITD(dqp));
	lp = &dqp->q_logitem;

	/*
	 * Get a log_item_desc to point at the new item.
	 */
	(void) xfs_trans_add_item(tp, (xfs_log_item_t*)(lp));

	/*
	 * Initialize i_transp so we can later determine if this dquot is
	 * associated with this transaction.
	 */
	dqp->q_transp = tp;
}


/*
 * This is called to mark the dquot as needing
 * to be logged when the transaction is committed.  The dquot must
 * already be associated with the given transaction.
 * Note that it marks the entire transaction as dirty. In the ordinary
 * case, this gets called via xfs_trans_commit, after the transaction
 * is already dirty. However, there's nothing stop this from getting
 * called directly, as done by xfs_qm_scall_setqlim. Hence, the TRANS_DIRTY
 * flag.
 */
void
xfs_trans_log_dquot(
	xfs_trans_t	*tp,
	xfs_dquot_t	*dqp)
{
	xfs_log_item_desc_t	*lidp;

	ASSERT(XFS_DQ_IS_ADDEDTO_TRX(tp, dqp));
	ASSERT(XFS_DQ_IS_LOCKED(dqp));

	lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)(&dqp->q_logitem));
	ASSERT(lidp != NULL);

	tp->t_flags |= XFS_TRANS_DIRTY;
	lidp->lid_flags |= XFS_LID_DIRTY;
}

/*
 * Carry forward whatever is left of the quota blk reservation to
 * the spanky new transaction
 */
STATIC void
xfs_trans_dup_dqinfo(
	xfs_trans_t	*otp,
	xfs_trans_t	*ntp)
{
	xfs_dqtrx_t	*oq, *nq;
	int		i,j;
	xfs_dqtrx_t	*oqa, *nqa;

	if (!otp->t_dqinfo)
		return;

	xfs_trans_alloc_dqinfo(ntp);
	oqa = otp->t_dqinfo->dqa_usrdquots;
	nqa = ntp->t_dqinfo->dqa_usrdquots;

	/*
	 * Because the quota blk reservation is carried forward,
	 * it is also necessary to carry forward the DQ_DIRTY flag.
	 */
	if(otp->t_flags & XFS_TRANS_DQ_DIRTY)
		ntp->t_flags |= XFS_TRANS_DQ_DIRTY;

	for (j = 0; j < 2; j++) {
		for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
			if (oqa[i].qt_dquot == NULL)
				break;
			oq = &oqa[i];
			nq = &nqa[i];

			nq->qt_dquot = oq->qt_dquot;
			nq->qt_bcount_delta = nq->qt_icount_delta = 0;
			nq->qt_rtbcount_delta = 0;

			/*
			 * Transfer whatever is left of the reservations.
			 */
			nq->qt_blk_res = oq->qt_blk_res - oq->qt_blk_res_used;
			oq->qt_blk_res = oq->qt_blk_res_used;

			nq->qt_rtblk_res = oq->qt_rtblk_res -
				oq->qt_rtblk_res_used;
			oq->qt_rtblk_res = oq->qt_rtblk_res_used;

			nq->qt_ino_res = oq->qt_ino_res - oq->qt_ino_res_used;
			oq->qt_ino_res = oq->qt_ino_res_used;

		}
		oqa = otp->t_dqinfo->dqa_grpdquots;
		nqa = ntp->t_dqinfo->dqa_grpdquots;
	}
}

/*
 * Wrap around mod_dquot to account for both user and group quotas.
 */
STATIC void
xfs_trans_mod_dquot_byino(
	xfs_trans_t	*tp,
	xfs_inode_t	*ip,
	uint		field,
	long		delta)
{
	xfs_mount_t	*mp;

	ASSERT(tp);
	mp = tp->t_mountp;

	if (!XFS_IS_QUOTA_ON(mp) ||
	    ip->i_ino == mp->m_sb.sb_uquotino ||
	    ip->i_ino == mp->m_sb.sb_gquotino)
		return;

	if (tp->t_dqinfo == NULL)
		xfs_trans_alloc_dqinfo(tp);

	if (XFS_IS_UQUOTA_ON(mp) && ip->i_udquot)
		(void) xfs_trans_mod_dquot(tp, ip->i_udquot, field, delta);
	if (XFS_IS_OQUOTA_ON(mp) && ip->i_gdquot)
		(void) xfs_trans_mod_dquot(tp, ip->i_gdquot, field, delta);
}

STATIC xfs_dqtrx_t *
xfs_trans_get_dqtrx(
	xfs_trans_t	*tp,
	xfs_dquot_t	*dqp)
{
	int		i;
	xfs_dqtrx_t	*qa;

	for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
		qa = XFS_QM_DQP_TO_DQACCT(tp, dqp);

		if (qa[i].qt_dquot == NULL ||
		    qa[i].qt_dquot == dqp) {
			return (&qa[i]);
		}
	}

	return (NULL);
}

/*
 * Make the changes in the transaction structure.
 * The moral equivalent to xfs_trans_mod_sb().
 * We don't touch any fields in the dquot, so we don't care
 * if it's locked or not (most of the time it won't be).
 */
void
xfs_trans_mod_dquot(
	xfs_trans_t	*tp,
	xfs_dquot_t	*dqp,
	uint		field,
	long		delta)
{
	xfs_dqtrx_t	*qtrx;

	ASSERT(tp);
	qtrx = NULL;

	if (tp->t_dqinfo == NULL)
		xfs_trans_alloc_dqinfo(tp);
	/*
	 * Find either the first free slot or the slot that belongs
	 * to this dquot.
	 */
	qtrx = xfs_trans_get_dqtrx(tp, dqp);
	ASSERT(qtrx);
	if (qtrx->qt_dquot == NULL)
		qtrx->qt_dquot = dqp;

	switch (field) {

		/*
		 * regular disk blk reservation
		 */
	      case XFS_TRANS_DQ_RES_BLKS:
		qtrx->qt_blk_res += (ulong)delta;
		break;

		/*
		 * inode reservation
		 */
	      case XFS_TRANS_DQ_RES_INOS:
		qtrx->qt_ino_res += (ulong)delta;
		break;

		/*
		 * disk blocks used.
		 */
	      case XFS_TRANS_DQ_BCOUNT:
		if (qtrx->qt_blk_res && delta > 0) {
			qtrx->qt_blk_res_used += (ulong)delta;
			ASSERT(qtrx->qt_blk_res >= qtrx->qt_blk_res_used);
		}
		qtrx->qt_bcount_delta += delta;
		break;

	      case XFS_TRANS_DQ_DELBCOUNT:
		qtrx->qt_delbcnt_delta += delta;
		break;

		/*
		 * Inode Count
		 */
	      case XFS_TRANS_DQ_ICOUNT:
		if (qtrx->qt_ino_res && delta > 0) {
			qtrx->qt_ino_res_used += (ulong)delta;
			ASSERT(qtrx->qt_ino_res >= qtrx->qt_ino_res_used);
		}
		qtrx->qt_icount_delta += delta;
		break;

		/*
		 * rtblk reservation
		 */
	      case XFS_TRANS_DQ_RES_RTBLKS:
		qtrx->qt_rtblk_res += (ulong)delta;
		break;

		/*
		 * rtblk count
		 */
	      case XFS_TRANS_DQ_RTBCOUNT:
		if (qtrx->qt_rtblk_res && delta > 0) {
			qtrx->qt_rtblk_res_used += (ulong)delta;
			ASSERT(qtrx->qt_rtblk_res >= qtrx->qt_rtblk_res_used);
		}
		qtrx->qt_rtbcount_delta += delta;
		break;

	      case XFS_TRANS_DQ_DELRTBCOUNT:
		qtrx->qt_delrtb_delta += delta;
		break;

	      default:
		ASSERT(0);
	}
	tp->t_flags |= XFS_TRANS_DQ_DIRTY;
}


/*
 * Given an array of dqtrx structures, lock all the dquots associated
 * and join them to the transaction, provided they have been modified.
 * We know that the highest number of dquots (of one type - usr OR grp),
 * involved in a transaction is 2 and that both usr and grp combined - 3.
 * So, we don't attempt to make this very generic.
 */
STATIC void
xfs_trans_dqlockedjoin(
	xfs_trans_t	*tp,
	xfs_dqtrx_t	*q)
{
	ASSERT(q[0].qt_dquot != NULL);
	if (q[1].qt_dquot == NULL) {
		xfs_dqlock(q[0].qt_dquot);
		xfs_trans_dqjoin(tp, q[0].qt_dquot);
	} else {
		ASSERT(XFS_QM_TRANS_MAXDQS == 2);
		xfs_dqlock2(q[0].qt_dquot, q[1].qt_dquot);
		xfs_trans_dqjoin(tp, q[0].qt_dquot);
		xfs_trans_dqjoin(tp, q[1].qt_dquot);
	}
}


/*
 * Called by xfs_trans_commit() and similar in spirit to
 * xfs_trans_apply_sb_deltas().
 * Go thru all the dquots belonging to this transaction and modify the
 * INCORE dquot to reflect the actual usages.
 * Unreserve just the reservations done by this transaction.
 * dquot is still left locked at exit.
 */
STATIC void
xfs_trans_apply_dquot_deltas(
	xfs_trans_t		*tp)
{
	int			i, j;
	xfs_dquot_t		*dqp;
	xfs_dqtrx_t		*qtrx, *qa;
	xfs_disk_dquot_t	*d;
	long			totalbdelta;
	long			totalrtbdelta;

	if (! (tp->t_flags & XFS_TRANS_DQ_DIRTY))
		return;

	ASSERT(tp->t_dqinfo);
	qa = tp->t_dqinfo->dqa_usrdquots;
	for (j = 0; j < 2; j++) {
		if (qa[0].qt_dquot == NULL) {
			qa = tp->t_dqinfo->dqa_grpdquots;
			continue;
		}

		/*
		 * Lock all of the dquots and join them to the transaction.
		 */
		xfs_trans_dqlockedjoin(tp, qa);

		for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
			qtrx = &qa[i];
			/*
			 * The array of dquots is filled
			 * sequentially, not sparsely.
			 */
			if ((dqp = qtrx->qt_dquot) == NULL)
				break;

			ASSERT(XFS_DQ_IS_LOCKED(dqp));
			ASSERT(XFS_DQ_IS_ADDEDTO_TRX(tp, dqp));

			/*
			 * adjust the actual number of blocks used
			 */
			d = &dqp->q_core;

			/*
			 * The issue here is - sometimes we don't make a blkquota
			 * reservation intentionally to be fair to users
			 * (when the amount is small). On the other hand,
			 * delayed allocs do make reservations, but that's
			 * outside of a transaction, so we have no
			 * idea how much was really reserved.
			 * So, here we've accumulated delayed allocation blks and
			 * non-delay blks. The assumption is that the
			 * delayed ones are always reserved (outside of a
			 * transaction), and the others may or may not have
			 * quota reservations.
			 */
			totalbdelta = qtrx->qt_bcount_delta +
				qtrx->qt_delbcnt_delta;
			totalrtbdelta = qtrx->qt_rtbcount_delta +
				qtrx->qt_delrtb_delta;
#ifdef QUOTADEBUG
			if (totalbdelta < 0)
				ASSERT(be64_to_cpu(d->d_bcount) >=
				       (xfs_qcnt_t) -totalbdelta);

			if (totalrtbdelta < 0)
				ASSERT(be64_to_cpu(d->d_rtbcount) >=
				       (xfs_qcnt_t) -totalrtbdelta);

			if (qtrx->qt_icount_delta < 0)
				ASSERT(be64_to_cpu(d->d_icount) >=
				       (xfs_qcnt_t) -qtrx->qt_icount_delta);
#endif
			if (totalbdelta)
				be64_add(&d->d_bcount, (xfs_qcnt_t)totalbdelta);

			if (qtrx->qt_icount_delta)
				be64_add(&d->d_icount, (xfs_qcnt_t)qtrx->qt_icount_delta);

			if (totalrtbdelta)
				be64_add(&d->d_rtbcount, (xfs_qcnt_t)totalrtbdelta);

			/*
			 * Get any default limits in use.
			 * Start/reset the timer(s) if needed.
			 */
			if (d->d_id) {
				xfs_qm_adjust_dqlimits(tp->t_mountp, d);
				xfs_qm_adjust_dqtimers(tp->t_mountp, d);
			}

			dqp->dq_flags |= XFS_DQ_DIRTY;
			/*
			 * add this to the list of items to get logged
			 */
			xfs_trans_log_dquot(tp, dqp);
			/*
			 * Take off what's left of the original reservation.
			 * In case of delayed allocations, there's no
			 * reservation that a transaction structure knows of.
			 */
			if (qtrx->qt_blk_res != 0) {
				if (qtrx->qt_blk_res != qtrx->qt_blk_res_used) {
					if (qtrx->qt_blk_res >
					    qtrx->qt_blk_res_used)
						dqp->q_res_bcount -= (xfs_qcnt_t)
							(qtrx->qt_blk_res -
							 qtrx->qt_blk_res_used);