text: /*
   * 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_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_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_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 = &dqp->q_logitem;
  
  	ASSERT(dqp->q_transp != tp);
  	ASSERT(XFS_DQ_IS_LOCKED(dqp));
  	ASSERT(lp->qli_dquot == dqp);
  
  	/*
  	 * 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(dqp->q_transp == tp);
  	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
   */
  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.
   */
  void
  xfs_trans_mod_dquot_byino(
  	xfs_trans_t	*tp,
  	xfs_inode_t	*ip,
  	uint		field,
  	long		delta)
  {
  	xfs_mount_t	*mp = tp->t_mountp;
  
  	if (!XFS_IS_QUOTA_RUNNING(mp) ||
  	    !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;
  
  	qa = XFS_QM_ISUDQ(dqp) ?
  		tp->t_dqinfo->dqa_usrdquots : tp->t_dqinfo->dqa_grpdquots;
  
  	for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
  		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);
  	ASSERT(XFS_IS_QUOTA_RUNNING(tp->t_mountp));
  	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.
   */
  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(dqp->q_transp == tp);
  
  			/*
  			 * 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_cpu(&d->d_bcount, (xfs_qcnt_t)totalbdelta);
  
  			if (qtrx->qt_icount_delta)
  				be64_add_cpu(&d->d_icount, (xfs_qcnt_t)qtrx->qt_icount_delta);
  
  			if (totalrtbdelta)
  				be64_add_cpu(&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);
  					else
  						dqp->q_res_bcount -= (xfs_qcnt_t)
  							(qtrx->qt_blk_res_used -
  							 qtrx->qt_blk_res);
  				}
  			} else {
  				/*
  				 * These blks were never reserved, either inside
  				 * a transaction or outside one (in a delayed
  				 * allocation). Also, this isn't always a
  				 * negative number since we sometimes
  				 * deliberately skip quota reservations.
  				 */
  				if (qtrx->qt_bcount_delta) {
  					dqp->q_res_bcount +=
  					      (xfs_qcnt_t)qtrx->qt_bcount_delta;
  				}
  			}
  			/*
  			 * Adjust the RT reservation.
  			 */
  			if (qtrx->qt_rtblk_res != 0) {
  				if (qtrx->qt_rtblk_res != qtrx->qt_rtblk_res_used) {
  					if (qtrx->qt_rtblk_res >
  					    qtrx->qt_rtblk_res_used)
  					       dqp->q_res_rtbcount -= (xfs_qcnt_t)
  						       (qtrx->qt_rtblk_res -
  							qtrx->qt_rtblk_res_used);
  					else
  					       dqp->q_res_rtbcount -= (xfs_qcnt_t)
  						       (qtrx->qt_rtblk_res_used -
  							qtrx->qt_rtblk_res);
  				}
  			} else {
  				if (qtrx->qt_rtbcount_delta)
  					dqp->q_res_rtbcount +=
  					    (xfs_qcnt_t)qtrx->qt_rtbcount_delta;
  			}
  
  			/*
  			 * Adjust the inode reservation.
  			 */
  			if (qtrx->qt_ino_res != 0) {
  				ASSERT(qtrx->qt_ino_res >=
  				       qtrx->qt_ino_res_used);
  				if (qtrx->qt_ino_res > qtrx->qt_ino_res_used)
  					dqp->q_res_icount -= (xfs_qcnt_t)
  						(qtrx->qt_ino_res -
  						 qtrx->qt_ino_res_used);
  			} else {
  				if (qtrx->qt_icount_delta)
  					dqp->q_res_icount +=
  					    (xfs_qcnt_t)qtrx->qt_icount_delta;
  			}
  
  			ASSERT(dqp->q_res_bcount >=
  				be64_to_cpu(dqp->q_core.d_bcount));
  			ASSERT(dqp->q_res_icount >=
  				be64_to_cpu(dqp->q_core.d_icount));
  			ASSERT(dqp->q_res_rtbcount >=
  				be64_to_cpu(dqp->q_core.d_rtbcount));
  		}
  		/*
  		 * Do the group quotas next
  		 */
  		qa = tp->t_dqinfo->dqa_grpdquots;
  	}
  }
  
  /*
   * Release the reservations, and adjust the dquots accordingly.
   * This is called only when the transaction is being aborted. If by
   * any chance we have done dquot modifications incore (ie. deltas) already,
   * we simply throw those away, since that's the expected behavior
   * when a transaction is curtailed without a commit.
   */
  void
  xfs_trans_unreserve_and_mod_dquots(
  	xfs_trans_t		*tp)
  {
  	int			i, j;
  	xfs_dquot_t		*dqp;
  	xfs_dqtrx_t		*qtrx, *qa;
  	boolean_t		locked;
  
  	if (!tp->t_dqinfo || !(tp->t_flags & XFS_TRANS_DQ_DIRTY))
  		return;
  
  	qa = tp->t_dqinfo->dqa_usrdquots;
  
  	for (j = 0; j < 2; j++) {
  		for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
  			qtrx = &qa[i];
  			/*
  			 * We assume that the array of dquots is filled
  			 * sequentially, not sparsely.
  			 */
  			if ((dqp = qtrx->qt_dquot) == NULL)
  				break;
  			/*
  			 * Unreserve the original reservation. We don't care
  			 * about the number of blocks used field, or deltas.
  			 * Also we don't bother to zero the fields.
  			 */
  			locked = B_FALSE;
  			if (qtrx->qt_blk_res) {
  				xfs_dqlock(dqp);
  				locked = B_TRUE;
  				dqp->q_res_bcount -=
  					(xfs_qcnt_t)qtrx->qt_blk_res;
  			}
  			if (qtrx->qt_ino_res) {
  				if (!locked) {
  					xfs_dqlock(dqp);
  					locked = B_TRUE;
  				}
  				dqp->q_res_icount -=
  					(xfs_qcnt_t)qtrx->qt_ino_res;
  			}
  
  			if (qtrx->qt_rtblk_res) {
  				if (!locked) {
  					xfs_dqlock(dqp);
  					locked = B_TRUE;
  				}
  				dqp->q_res_rtbcount -=
  					(xfs_qcnt_t)qtrx->qt_rtblk_res;
  			}
  			if (locked)
  				xfs_dqunlock(dqp);
  
  		}
  		qa = tp->t_dqinfo->dqa_grpdquots;
  	}
  }
  
  STATIC void
  xfs_quota_warn(
  	struct xfs_mount	*mp,
  	struct xfs_dquot	*dqp,
  	int			type)
  {
  	/* no warnings for project quotas - we just return ENOSPC later */
  	if (dqp->dq_flags & XFS_DQ_PROJ)
  		return;
  	quota_send_warning((dqp->dq_flags & XFS_DQ_USER) ? USRQUOTA : GRPQUOTA,
  			   be32_to_cpu(dqp->q_core.d_id), mp->m_super->s_dev,
  			   type);
  }
  
  /*
   * This reserves disk blocks and inodes against a dquot.
   * Flags indicate if the dquot is to be locked here and also
   * if the blk reservation is for RT or regular blocks.
   * Sending in XFS_QMOPT_FORCE_RES flag skips the quota check.
   */
  STATIC int
  xfs_trans_dqresv(
  	xfs_trans_t	*tp,
  	xfs_mount_t	*mp,
  	xfs_dquot_t	*dqp,
  	long		nblks,
  	long		ninos,
  	uint		flags)
  {
  	xfs_qcnt_t	hardlimit;
  	xfs_qcnt_t	softlimit;
  	time_t		timer;
  	xfs_qwarncnt_t	warns;
  	xfs_qwarncnt_t	warnlimit;
  	xfs_qcnt_t	count;
  	xfs_qcnt_t	*resbcountp;
  	xfs_quotainfo_t	*q = mp->m_quotainfo;
  
  
  	xfs_dqlock(dqp);
  
  	if (flags & XFS_TRANS_DQ_RES_BLKS) {
  		hardlimit = be64_to_cpu(dqp->q_core.d_blk_hardlimit);
  		if (!hardlimit)
  			hardlimit = q->qi_bhardlimit;
  		softlimit = be64_to_cpu(dqp->q_core.d_blk_softlimit);
  		if (!softlimit)
  			softlimit = q->qi_bsoftlimit;
  		timer = be32_to_cpu(dqp->q_core.d_btimer);
  		warns = be16_to_cpu(dqp->q_core.d_bwarns);
  		warnlimit = dqp->q_mount->m_quotainfo->qi_bwarnlimit;
  		resbcountp = &dqp->q_res_bcount;
  	} else {
  		ASSERT(flags & XFS_TRANS_DQ_RES_RTBLKS);
  		hardlimit = be64_to_cpu(dqp->q_core.d_rtb_hardlimit);
  		if (!hardlimit)
  			hardlimit = q->qi_rtbhardlimit;
  		softlimit = be64_to_cpu(dqp->q_core.d_rtb_softlimit);
  		if (!softlimit)
  			softlimit = q->qi_rtbsoftlimit;
  		timer = be32_to_cpu(dqp->q_core.d_rtbtimer);
  		warns = be16_to_cpu(dqp->q_core.d_rtbwarns);
  		warnlimit = dqp->q_mount->m_quotainfo->qi_rtbwarnlimit;
  		resbcountp = &dqp->q_res_rtbcount;
  	}
  
  	if ((flags & XFS_QMOPT_FORCE_RES) == 0 &&
  	    dqp->q_core.d_id &&
  	    ((XFS_IS_UQUOTA_ENFORCED(dqp->q_mount) && XFS_QM_ISUDQ(dqp)) ||
  	     (XFS_IS_OQUOTA_ENFORCED(dqp->q_mount) &&
  	      (XFS_QM_ISPDQ(dqp) || XFS_QM_ISGDQ(dqp))))) {
  #ifdef QUOTADEBUG
  		cmn_err(CE_DEBUG, "BLK Res: nblks=%ld + resbcount=%Ld"
  			  " > hardlimit=%Ld?", nblks, *resbcountp, hardlimit);
  #endif
  		if (nblks > 0) {
  			/*
  			 * dquot is locked already. See if we'd go over the
  			 * hardlimit or exceed the timelimit if we allocate
  			 * nblks.
  			 */
  			if (hardlimit > 0ULL &&
  			    hardlimit <= nblks + *resbcountp) {
  				xfs_quota_warn(mp, dqp, QUOTA_NL_BHARDWARN);
  				goto error_return;
  			}
  			if (softlimit > 0ULL &&
  			    softlimit <= nblks + *resbcountp) {
  				if ((timer != 0 && get_seconds() > timer) ||
  				    (warns != 0 && warns >= warnlimit)) {
  					xfs_quota_warn(mp, dqp,
  						       QUOTA_NL_BSOFTLONGWARN);
  					goto error_return;
  				}
  
  				xfs_quota_warn(mp, dqp, QUOTA_NL_BSOFTWARN);
  			}
  		}
  		if (ninos > 0) {
  			count = be64_to_cpu(dqp->q_core.d_icount);
  			timer = be32_to_cpu(dqp->q_core.d_itimer);
  			warns = be16_to_cpu(dqp->q_core.d_iwarns);
  			warnlimit = dqp->q_mount->m_quotainfo->qi_iwarnlimit;
  			hardlimit = be64_to_cpu(dqp->q_core.d_ino_hardlimit);
  			if (!hardlimit)
  				hardlimit = q->qi_ihardlimit;
  			softlimit = be64_to_cpu(dqp->q_core.d_ino_softlimit);
  			if (!softlimit)
  				softlimit = q->qi_isoftlimit;
  
  			if (hardlimit > 0ULL && count >= hardlimit) {
  				xfs_quota_warn(mp, dqp, QUOTA_NL_IHARDWARN);
  				goto error_return;
  			}
  			if (softlimit > 0ULL && count >= softlimit) {
  				if  ((timer != 0 && get_seconds() > timer) ||
  				     (warns != 0 && warns >= warnlimit)) {
  					xfs_quota_warn(mp, dqp,
  						       QUOTA_NL_ISOFTLONGWARN);
  					goto error_return;
  				}
  				xfs_quota_warn(mp, dqp, QUOTA_NL_ISOFTWARN);
  			}
  		}
  	}
  
  	/*
  	 * Change the reservation, but not the actual usage.
  	 * Note that q_res_bcount = q_core.d_bcount + resv
  	 */
  	(*resbcountp) += (xfs_qcnt_t)nblks;
  	if (ninos != 0)
  		dqp->q_res_icount += (xfs_qcnt_t)ninos;
  
  	/*
  	 * note the reservation amt in the trans struct too,
  	 * so that the transaction knows how much was reserved by
  	 * it against this particular dquot.
  	 * We don't do this when we are reserving for a delayed allocation,
  	 * because we don't have the luxury of a transaction envelope then.
  	 */
  	if (tp) {
  		ASSERT(tp->t_dqinfo);
  		ASSERT(flags & XFS_QMOPT_RESBLK_MASK);
  		if (nblks != 0)
  			xfs_trans_mod_dquot(tp, dqp,
  					    flags & XFS_QMOPT_RESBLK_MASK,
  					    nblks);
  		if (ninos != 0)
  			xfs_trans_mod_dquot(tp, dqp,
  					    XFS_TRANS_DQ_RES_INOS,
  					    ninos);
  	}
  	ASSERT(dqp->q_res_bcount >= be64_to_cpu(dqp->q_core.d_bcount));
  	ASSERT(dqp->q_res_rtbcount >= be64_to_cpu(dqp->q_core.d_rtbcount));
  	ASSERT(dqp->q_res_icount >= be64_to_cpu(dqp->q_core.d_icount));
  
  	xfs_dqunlock(dqp);
  	return 0;
  
  error_return:
  	xfs_dqunlock(dqp);
  	if (flags & XFS_QMOPT_ENOSPC)
  		return ENOSPC;
  	return EDQUOT;
  }
  
  
  /*
   * Given dquot(s), make disk block and/or inode reservations against them.
   * The fact that this does the reservation against both the usr and
   * grp/prj quotas is important, because this follows a both-or-nothing
   * approach.
   *
   * flags = XFS_QMOPT_FORCE_RES evades limit enforcement. Used by chown.
   *	   XFS_QMOPT_ENOSPC returns ENOSPC not EDQUOT.  Used by pquota.
   *	   XFS_TRANS_DQ_RES_BLKS reserves regular disk blocks
   *	   XFS_TRANS_DQ_RES_RTBLKS reserves realtime disk blocks
   * dquots are unlocked on return, if they were not locked by caller.
   */
  int
  xfs_trans_reserve_quota_bydquots(
  	xfs_trans_t	*tp,
  	xfs_mount_t	*mp,
  	xfs_dquot_t	*udqp,
  	xfs_dquot_t	*gdqp,
  	long		nblks,
  	long		ninos,
  	uint		flags)
  {
  	int		resvd = 0, error;
  
  	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
  		return 0;
  
  	if (tp && tp->t_dqinfo == NULL)
  		xfs_trans_alloc_dqinfo(tp);
  
  	ASSERT(flags & XFS_QMOPT_RESBLK_MASK);
  
  	if (udqp) {
  		error = xfs_trans_dqresv(tp, mp, udqp, nblks, ninos,
  					(flags & ~XFS_QMOPT_ENOSPC));
  		if (error)
  			return error;
  		resvd = 1;
  	}
  
  	if (gdqp) {
  		error = xfs_trans_dqresv(tp, mp, gdqp, nblks, ninos, flags);
  		if (error) {
  			/*
  			 * can't do it, so backout previous reservation
  			 */
  			if (resvd) {
  				flags |= XFS_QMOPT_FORCE_RES;
  				xfs_trans_dqresv(tp, mp, udqp,
  						 -nblks, -ninos, flags);
  			}
  			return error;
  		}
  	}
  
  	/*
  	 * Didn't change anything critical, so, no need to log
  	 */
  	return 0;
  }
  
  
  /*
   * Lock the dquot and change the reservation if we can.
   * This doesn't change the actual usage, just the reservation.
   * The inode sent in is locked.
   */
  int
  xfs_trans_reserve_quota_nblks(
  	struct xfs_trans	*tp,
  	struct xfs_inode	*ip,
  	long			nblks,
  	long			ninos,
  	uint			flags)
  {
  	struct xfs_mount	*mp = ip->i_mount;
  
  	if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
  		return 0;
  	if (XFS_IS_PQUOTA_ON(mp))
  		flags |= XFS_QMOPT_ENOSPC;
  
  	ASSERT(ip->i_ino != mp->m_sb.sb_uquotino);
  	ASSERT(ip->i_ino != mp->m_sb.sb_gquotino);
  
  	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
  	ASSERT((flags & ~(XFS_QMOPT_FORCE_RES | XFS_QMOPT_ENOSPC)) ==
  				XFS_TRANS_DQ_RES_RTBLKS ||
  	       (flags & ~(XFS_QMOPT_FORCE_RES | XFS_QMOPT_ENOSPC)) ==
  				XFS_TRANS_DQ_RES_BLKS);
  
  	/*
  	 * Reserve nblks against these dquots, with trans as the mediator.
  	 */
  	return xfs_trans_reserve_quota_bydquots(tp, mp,
  						ip->i_udquot, ip->i_gdquot,
  						nblks, ninos, flags);
  }
  
  /*
   * This routine is called to allocate a quotaoff log item.
   */
  xfs_qoff_logitem_t *
  xfs_trans_get_qoff_item(
  	xfs_trans_t		*tp,
  	xfs_qoff_logitem_t	*startqoff,
  	uint			flags)
  {
  	xfs_qoff_logitem_t	*q;
  
  	ASSERT(tp != NULL);
  
  	q = xfs_qm_qoff_logitem_init(tp->t_mountp, startqoff, flags);
  	ASSERT(q != NULL);
  
  	/*
  	 * Get a log_item_desc to point at the new item.
  	 */
  	(void) xfs_trans_add_item(tp, (xfs_log_item_t*)q);
  
  	return (q);
  }
  
  
  /*
   * This is called to mark the quotaoff logitem as needing
   * to be logged when the transaction is committed.  The logitem must
   * already be associated with the given transaction.
   */
  void
  xfs_trans_log_quotaoff_item(
  	xfs_trans_t		*tp,
  	xfs_qoff_logitem_t	*qlp)
  {
  	xfs_log_item_desc_t	*lidp;
  
  	lidp = xfs_trans_find_item(tp, (xfs_log_item_t *)qlp);
  	ASSERT(lidp != NULL);
  
  	tp->t_flags |= XFS_TRANS_DIRTY;
  	lidp->lid_flags |= XFS_LID_DIRTY;
  }
  
  STATIC void
  xfs_trans_alloc_dqinfo(
  	xfs_trans_t	*tp)
  {
  	tp->t_dqinfo = kmem_zone_zalloc(xfs_Gqm->qm_dqtrxzone, KM_SLEEP);
  }
  
  void
  xfs_trans_free_dqinfo(
  	xfs_trans_t	*tp)
  {
  	if (!tp->t_dqinfo)
  		return;
  	kmem_zone_free(xfs_Gqm->qm_dqtrxzone, tp->t_dqinfo);
  	tp->t_dqinfo = NULL;
  }
  