/*

   * Copyright (c) 2000-2005 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 <linux/capability.h>

  #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_alloc.h"

  #include "xfs_quota.h"
  #include "xfs_mount.h"

  #include "xfs_bmap_btree.h"

  #include "xfs_inode.h"

  #include "xfs_itable.h"

  #include "xfs_bmap.h"

  #include "xfs_rtalloc.h"
  #include "xfs_error.h"

  #include "xfs_attr.h"
  #include "xfs_buf_item.h"
  #include "xfs_utils.h"

  #include "xfs_qm.h"

  #include "xfs_trace.h"

  STATIC int	xfs_qm_log_quotaoff(xfs_mount_t *, xfs_qoff_logitem_t **, uint);
  STATIC int	xfs_qm_log_quotaoff_end(xfs_mount_t *, xfs_qoff_logitem_t *,
  					uint);

  STATIC uint	xfs_qm_export_flags(uint);

  STATIC uint	xfs_qm_export_qtype_flags(uint);
  STATIC void	xfs_qm_export_dquot(xfs_mount_t *, xfs_disk_dquot_t *,
  					fs_disk_quota_t *);
  
  
  /*

   * Turn off quota accounting and/or enforcement for all udquots and/or
   * gdquots. Called only at unmount time.
   *
   * This assumes that there are no dquots of this file system cached
   * incore, and modifies the ondisk dquot directly. Therefore, for example,
   * it is an error to call this twice, without purging the cache.
   */

  int

  xfs_qm_scall_quotaoff(
  	xfs_mount_t		*mp,

  	uint			flags)

  {

  	struct xfs_quotainfo	*q = mp->m_quotainfo;

  	uint			dqtype;

  	int			error;
  	uint			inactivate_flags;
  	xfs_qoff_logitem_t	*qoffstart;
  	int			nculprits;

  	/*
  	 * No file system can have quotas enabled on disk but not in core.
  	 * Note that quota utilities (like quotaoff) _expect_
  	 * errno == EEXIST here.
  	 */
  	if ((mp->m_qflags & flags) == 0)
  		return XFS_ERROR(EEXIST);
  	error = 0;
  
  	flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);
  
  	/*
  	 * We don't want to deal with two quotaoffs messing up each other,
  	 * so we're going to serialize it. quotaoff isn't exactly a performance
  	 * critical thing.
  	 * If quotaoff, then we must be dealing with the root filesystem.
  	 */

  	ASSERT(q);
  	mutex_lock(&q->qi_quotaofflock);

  
  	/*
  	 * If we're just turning off quota enforcement, change mp and go.
  	 */
  	if ((flags & XFS_ALL_QUOTA_ACCT) == 0) {
  		mp->m_qflags &= ~(flags);

  		spin_lock(&mp->m_sb_lock);

  		mp->m_sb.sb_qflags = mp->m_qflags;

  		spin_unlock(&mp->m_sb_lock);

  		mutex_unlock(&q->qi_quotaofflock);

  
  		/* XXX what to do if error ? Revert back to old vals incore ? */
  		error = xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS);
  		return (error);
  	}
  
  	dqtype = 0;
  	inactivate_flags = 0;
  	/*
  	 * If accounting is off, we must turn enforcement off, clear the
  	 * quota 'CHKD' certificate to make it known that we have to
  	 * do a quotacheck the next time this quota is turned on.
  	 */
  	if (flags & XFS_UQUOTA_ACCT) {
  		dqtype |= XFS_QMOPT_UQUOTA;
  		flags |= (XFS_UQUOTA_CHKD | XFS_UQUOTA_ENFD);
  		inactivate_flags |= XFS_UQUOTA_ACTIVE;
  	}
  	if (flags & XFS_GQUOTA_ACCT) {
  		dqtype |= XFS_QMOPT_GQUOTA;

  		flags |= (XFS_OQUOTA_CHKD | XFS_OQUOTA_ENFD);

  		inactivate_flags |= XFS_GQUOTA_ACTIVE;

  	} else if (flags & XFS_PQUOTA_ACCT) {
  		dqtype |= XFS_QMOPT_PQUOTA;
  		flags |= (XFS_OQUOTA_CHKD | XFS_OQUOTA_ENFD);
  		inactivate_flags |= XFS_PQUOTA_ACTIVE;

  	}
  
  	/*
  	 * Nothing to do?  Don't complain. This happens when we're just
  	 * turning off quota enforcement.
  	 */

  	if ((mp->m_qflags & flags) == 0)
  		goto out_unlock;

  
  	/*
  	 * Write the LI_QUOTAOFF log record, and do SB changes atomically,

  	 * and synchronously. If we fail to write, we should abort the
  	 * operation as it cannot be recovered safely if we crash.

  	 */

  	error = xfs_qm_log_quotaoff(mp, &qoffstart, flags);
  	if (error)

  		goto out_unlock;

  
  	/*
  	 * Next we clear the XFS_MOUNT_*DQ_ACTIVE bit(s) in the mount struct
  	 * to take care of the race between dqget and quotaoff. We don't take
  	 * any special locks to reset these bits. All processes need to check
  	 * these bits *after* taking inode lock(s) to see if the particular
  	 * quota type is in the process of being turned off. If *ACTIVE, it is
  	 * guaranteed that all dquot structures and all quotainode ptrs will all
  	 * stay valid as long as that inode is kept locked.
  	 *
  	 * There is no turning back after this.
  	 */
  	mp->m_qflags &= ~inactivate_flags;
  
  	/*
  	 * Give back all the dquot reference(s) held by inodes.
  	 * Here we go thru every single incore inode in this file system, and
  	 * do a dqrele on the i_udquot/i_gdquot that it may have.
  	 * Essentially, as long as somebody has an inode locked, this guarantees
  	 * that quotas will not be turned off. This is handy because in a
  	 * transaction once we lock the inode(s) and check for quotaon, we can
  	 * depend on the quota inodes (and other things) being valid as long as
  	 * we keep the lock(s).
  	 */
  	xfs_qm_dqrele_all_inodes(mp, flags);
  
  	/*
  	 * Next we make the changes in the quota flag in the mount struct.
  	 * This isn't protected by a particular lock directly, because we

  	 * don't want to take a mrlock every time we depend on quotas being on.

  	 */
  	mp->m_qflags &= ~(flags);
  
  	/*
  	 * Go through all the dquots of this file system and purge them,
  	 * according to what was turned off. We may not be able to get rid
  	 * of all dquots, because dquots can have temporary references that
  	 * are not attached to inodes. eg. xfs_setattr, xfs_create.
  	 * So, if we couldn't purge all the dquots from the filesystem,
  	 * we can't get rid of the incore data structures.
  	 */

  	while ((nculprits = xfs_qm_dqpurge_all(mp, dqtype)))

  		delay(10 * nculprits);
  
  	/*
  	 * Transactions that had started before ACTIVE state bit was cleared
  	 * could have logged many dquots, so they'd have higher LSNs than
  	 * the first QUOTAOFF log record does. If we happen to crash when
  	 * the tail of the log has gone past the QUOTAOFF record, but
  	 * before the last dquot modification, those dquots __will__
  	 * recover, and that's not good.
  	 *
  	 * So, we have QUOTAOFF start and end logitems; the start
  	 * logitem won't get overwritten until the end logitem appears...
  	 */

  	error = xfs_qm_log_quotaoff_end(mp, qoffstart, flags);
  	if (error) {
  		/* We're screwed now. Shutdown is the only option. */
  		xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);

  		goto out_unlock;

  	}

  
  	/*
  	 * If quotas is completely disabled, close shop.
  	 */

  	if (((flags & XFS_MOUNT_QUOTA_ALL) == XFS_MOUNT_QUOTA_SET1) ||
  	    ((flags & XFS_MOUNT_QUOTA_ALL) == XFS_MOUNT_QUOTA_SET2)) {

  		mutex_unlock(&q->qi_quotaofflock);

  		xfs_qm_destroy_quotainfo(mp);
  		return (0);
  	}
  
  	/*

  	 * Release our quotainode references if we don't need them anymore.

  	 */

  	if ((dqtype & XFS_QMOPT_UQUOTA) && q->qi_uquotaip) {
  		IRELE(q->qi_uquotaip);
  		q->qi_uquotaip = NULL;

  	}

  	if ((dqtype & (XFS_QMOPT_GQUOTA|XFS_QMOPT_PQUOTA)) && q->qi_gquotaip) {
  		IRELE(q->qi_gquotaip);
  		q->qi_gquotaip = NULL;

  	}

  out_unlock:
  	mutex_unlock(&q->qi_quotaofflock);
  	return error;

  }

  STATIC int
  xfs_qm_scall_trunc_qfile(
  	struct xfs_mount	*mp,
  	xfs_ino_t		ino)
  {
  	struct xfs_inode	*ip;
  	struct xfs_trans	*tp;
  	int			error;
  
  	if (ino == NULLFSINO)
  		return 0;
  
  	error = xfs_iget(mp, NULL, ino, 0, 0, &ip);
  	if (error)
  		return error;
  
  	xfs_ilock(ip, XFS_IOLOCK_EXCL);
  
  	tp = xfs_trans_alloc(mp, XFS_TRANS_TRUNCATE_FILE);
  	error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
  				  XFS_TRANS_PERM_LOG_RES,
  				  XFS_ITRUNCATE_LOG_COUNT);
  	if (error) {
  		xfs_trans_cancel(tp, 0);
  		xfs_iunlock(ip, XFS_IOLOCK_EXCL);
  		goto out_put;
  	}
  
  	xfs_ilock(ip, XFS_ILOCK_EXCL);

  	xfs_trans_ijoin(tp, ip, 0);

  	error = xfs_itruncate_data(&tp, ip, 0);

  	if (error) {
  		xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
  				     XFS_TRANS_ABORT);
  		goto out_unlock;
  	}

  	xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);

  	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
  
  out_unlock:
  	xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
  out_put:
  	IRELE(ip);
  	return error;
  }

  int

  xfs_qm_scall_trunc_qfiles(
  	xfs_mount_t	*mp,
  	uint		flags)
  {

  	int		error = 0, error2 = 0;

  	if (!xfs_sb_version_hasquota(&mp->m_sb) || flags == 0) {

  		xfs_debug(mp, "%s: flags=%x m_qflags=%x
  ",
  			__func__, flags, mp->m_qflags);

  		return XFS_ERROR(EINVAL);
  	}

  	if (flags & XFS_DQ_USER)
  		error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_uquotino);
  	if (flags & (XFS_DQ_GROUP|XFS_DQ_PROJ))
  		error2 = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_gquotino);

  	return error ? error : error2;

  }

  /*
   * Switch on (a given) quota enforcement for a filesystem.  This takes
   * effect immediately.
   * (Switching on quota accounting must be done at mount time.)
   */

  int

  xfs_qm_scall_quotaon(
  	xfs_mount_t	*mp,
  	uint		flags)
  {
  	int		error;

  	uint		qf;

  	__int64_t	sbflags;

  	flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);
  	/*
  	 * Switching on quota accounting must be done at mount time.
  	 */

  	flags &= ~(XFS_ALL_QUOTA_ACCT);
  
  	sbflags = 0;
  
  	if (flags == 0) {

  		xfs_debug(mp, "%s: zero flags, m_qflags=%x
  ",
  			__func__, mp->m_qflags);

  		return XFS_ERROR(EINVAL);
  	}
  
  	/* No fs can turn on quotas with a delayed effect */
  	ASSERT((flags & XFS_ALL_QUOTA_ACCT) == 0);
  
  	/*
  	 * Can't enforce without accounting. We check the superblock
  	 * qflags here instead of m_qflags because rootfs can have
  	 * quota acct on ondisk without m_qflags' knowing.
  	 */
  	if (((flags & XFS_UQUOTA_ACCT) == 0 &&
  	    (mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) == 0 &&
  	    (flags & XFS_UQUOTA_ENFD))
  	    ||

  	    ((flags & XFS_PQUOTA_ACCT) == 0 &&
  	    (mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) == 0 &&

  	    (flags & XFS_GQUOTA_ACCT) == 0 &&

  	    (mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) == 0 &&

  	    (flags & XFS_OQUOTA_ENFD))) {

  		xfs_debug(mp,
  			"%s: Can't enforce without acct, flags=%x sbflags=%x
  ",
  			__func__, flags, mp->m_sb.sb_qflags);

  		return XFS_ERROR(EINVAL);
  	}
  	/*

  	 * If everything's up to-date incore, then don't waste time.

  	 */
  	if ((mp->m_qflags & flags) == flags)
  		return XFS_ERROR(EEXIST);
  
  	/*
  	 * Change sb_qflags on disk but not incore mp->qflags
  	 * if this is the root filesystem.
  	 */

  	spin_lock(&mp->m_sb_lock);

  	qf = mp->m_sb.sb_qflags;
  	mp->m_sb.sb_qflags = qf | flags;

  	spin_unlock(&mp->m_sb_lock);

  
  	/*
  	 * There's nothing to change if it's the same.
  	 */
  	if ((qf & flags) == flags && sbflags == 0)
  		return XFS_ERROR(EEXIST);
  	sbflags |= XFS_SB_QFLAGS;
  
  	if ((error = xfs_qm_write_sb_changes(mp, sbflags)))
  		return (error);
  	/*
  	 * If we aren't trying to switch on quota enforcement, we are done.
  	 */
  	if  (((mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) !=
  	     (mp->m_qflags & XFS_UQUOTA_ACCT)) ||

  	     ((mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) !=
  	     (mp->m_qflags & XFS_PQUOTA_ACCT)) ||
  	     ((mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) !=
  	     (mp->m_qflags & XFS_GQUOTA_ACCT)) ||

  	    (flags & XFS_ALL_QUOTA_ENFD) == 0)
  		return (0);
  
  	if (! XFS_IS_QUOTA_RUNNING(mp))
  		return XFS_ERROR(ESRCH);
  
  	/*
  	 * Switch on quota enforcement in core.
  	 */

  	mutex_lock(&mp->m_quotainfo->qi_quotaofflock);

  	mp->m_qflags |= (flags & XFS_ALL_QUOTA_ENFD);

  	mutex_unlock(&mp->m_quotainfo->qi_quotaofflock);

  
  	return (0);
  }

  /*
   * Return quota status information, such as uquota-off, enforcements, etc.
   */

  int

  xfs_qm_scall_getqstat(

  	struct xfs_mount	*mp,
  	struct fs_quota_stat	*out)

  {

  	struct xfs_quotainfo	*q = mp->m_quotainfo;
  	struct xfs_inode	*uip, *gip;
  	boolean_t		tempuqip, tempgqip;

  
  	uip = gip = NULL;
  	tempuqip = tempgqip = B_FALSE;
  	memset(out, 0, sizeof(fs_quota_stat_t));
  
  	out->qs_version = FS_QSTAT_VERSION;

  	if (!xfs_sb_version_hasquota(&mp->m_sb)) {

  		out->qs_uquota.qfs_ino = NULLFSINO;
  		out->qs_gquota.qfs_ino = NULLFSINO;
  		return (0);
  	}
  	out->qs_flags = (__uint16_t) xfs_qm_export_flags(mp->m_qflags &
  							(XFS_ALL_QUOTA_ACCT|
  							 XFS_ALL_QUOTA_ENFD));
  	out->qs_pad = 0;
  	out->qs_uquota.qfs_ino = mp->m_sb.sb_uquotino;
  	out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;

  	if (q) {
  		uip = q->qi_uquotaip;
  		gip = q->qi_gquotaip;

  	}
  	if (!uip && mp->m_sb.sb_uquotino != NULLFSINO) {
  		if (xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,

  					0, 0, &uip) == 0)

  			tempuqip = B_TRUE;
  	}
  	if (!gip && mp->m_sb.sb_gquotino != NULLFSINO) {
  		if (xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,

  					0, 0, &gip) == 0)

  			tempgqip = B_TRUE;
  	}
  	if (uip) {
  		out->qs_uquota.qfs_nblks = uip->i_d.di_nblocks;
  		out->qs_uquota.qfs_nextents = uip->i_d.di_nextents;
  		if (tempuqip)

  			IRELE(uip);

  	}
  	if (gip) {
  		out->qs_gquota.qfs_nblks = gip->i_d.di_nblocks;
  		out->qs_gquota.qfs_nextents = gip->i_d.di_nextents;
  		if (tempgqip)

  			IRELE(gip);

  	}

  	if (q) {
  		out->qs_incoredqs = q->qi_dquots;
  		out->qs_btimelimit = q->qi_btimelimit;
  		out->qs_itimelimit = q->qi_itimelimit;
  		out->qs_rtbtimelimit = q->qi_rtbtimelimit;
  		out->qs_bwarnlimit = q->qi_bwarnlimit;
  		out->qs_iwarnlimit = q->qi_iwarnlimit;

  	}

  	return 0;

  }

  #define XFS_DQ_MASK \
  	(FS_DQ_LIMIT_MASK | FS_DQ_TIMER_MASK | FS_DQ_WARNS_MASK)

  /*
   * Adjust quota limits, and start/stop timers accordingly.
   */

  int

  xfs_qm_scall_setqlim(
  	xfs_mount_t		*mp,
  	xfs_dqid_t		id,
  	uint			type,
  	fs_disk_quota_t		*newlim)
  {

  	struct xfs_quotainfo	*q = mp->m_quotainfo;

  	xfs_disk_dquot_t	*ddq;
  	xfs_dquot_t		*dqp;
  	xfs_trans_t		*tp;
  	int			error;
  	xfs_qcnt_t		hard, soft;

  	if (newlim->d_fieldmask & ~XFS_DQ_MASK)
  		return EINVAL;
  	if ((newlim->d_fieldmask & XFS_DQ_MASK) == 0)
  		return 0;

  
  	tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SETQLIM);
  	if ((error = xfs_trans_reserve(tp, 0, sizeof(xfs_disk_dquot_t) + 128,
  				      0, 0, XFS_DEFAULT_LOG_COUNT))) {
  		xfs_trans_cancel(tp, 0);
  		return (error);
  	}
  
  	/*
  	 * We don't want to race with a quotaoff so take the quotaoff lock.
  	 * (We don't hold an inode lock, so there's nothing else to stop
  	 * a quotaoff from happening). (XXXThis doesn't currently happen
  	 * because we take the vfslock before calling xfs_qm_sysent).
  	 */

  	mutex_lock(&q->qi_quotaofflock);

  
  	/*
  	 * Get the dquot (locked), and join it to the transaction.
  	 * Allocate the dquot if this doesn't exist.
  	 */
  	if ((error = xfs_qm_dqget(mp, NULL, id, type, XFS_QMOPT_DQALLOC, &dqp))) {
  		xfs_trans_cancel(tp, XFS_TRANS_ABORT);

  		ASSERT(error != ENOENT);

  		goto out_unlock;

  	}

  	xfs_trans_dqjoin(tp, dqp);
  	ddq = &dqp->q_core;
  
  	/*
  	 * Make sure that hardlimits are >= soft limits before changing.
  	 */
  	hard = (newlim->d_fieldmask & FS_DQ_BHARD) ?
  		(xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_hardlimit) :

  			be64_to_cpu(ddq->d_blk_hardlimit);

  	soft = (newlim->d_fieldmask & FS_DQ_BSOFT) ?
  		(xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_softlimit) :

  			be64_to_cpu(ddq->d_blk_softlimit);

  	if (hard == 0 || hard >= soft) {

  		ddq->d_blk_hardlimit = cpu_to_be64(hard);
  		ddq->d_blk_softlimit = cpu_to_be64(soft);

  		if (id == 0) {

  			q->qi_bhardlimit = hard;
  			q->qi_bsoftlimit = soft;

  		}
  	} else {

  		xfs_debug(mp, "blkhard %Ld < blksoft %Ld
  ", hard, soft);

  	}
  	hard = (newlim->d_fieldmask & FS_DQ_RTBHARD) ?
  		(xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_hardlimit) :

  			be64_to_cpu(ddq->d_rtb_hardlimit);

  	soft = (newlim->d_fieldmask & FS_DQ_RTBSOFT) ?
  		(xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_softlimit) :

  			be64_to_cpu(ddq->d_rtb_softlimit);

  	if (hard == 0 || hard >= soft) {

  		ddq->d_rtb_hardlimit = cpu_to_be64(hard);
  		ddq->d_rtb_softlimit = cpu_to_be64(soft);

  		if (id == 0) {

  			q->qi_rtbhardlimit = hard;
  			q->qi_rtbsoftlimit = soft;

  		}
  	} else {

  		xfs_debug(mp, "rtbhard %Ld < rtbsoft %Ld
  ", hard, soft);

  	}
  
  	hard = (newlim->d_fieldmask & FS_DQ_IHARD) ?
  		(xfs_qcnt_t) newlim->d_ino_hardlimit :

  			be64_to_cpu(ddq->d_ino_hardlimit);

  	soft = (newlim->d_fieldmask & FS_DQ_ISOFT) ?
  		(xfs_qcnt_t) newlim->d_ino_softlimit :

  			be64_to_cpu(ddq->d_ino_softlimit);

  	if (hard == 0 || hard >= soft) {

  		ddq->d_ino_hardlimit = cpu_to_be64(hard);
  		ddq->d_ino_softlimit = cpu_to_be64(soft);

  		if (id == 0) {

  			q->qi_ihardlimit = hard;
  			q->qi_isoftlimit = soft;

  		}
  	} else {

  		xfs_debug(mp, "ihard %Ld < isoft %Ld
  ", hard, soft);

  	}

  	/*
  	 * Update warnings counter(s) if requested
  	 */
  	if (newlim->d_fieldmask & FS_DQ_BWARNS)

  		ddq->d_bwarns = cpu_to_be16(newlim->d_bwarns);

  	if (newlim->d_fieldmask & FS_DQ_IWARNS)

  		ddq->d_iwarns = cpu_to_be16(newlim->d_iwarns);

  	if (newlim->d_fieldmask & FS_DQ_RTBWARNS)

  		ddq->d_rtbwarns = cpu_to_be16(newlim->d_rtbwarns);

  	if (id == 0) {
  		/*
  		 * Timelimits for the super user set the relative time
  		 * the other users can be over quota for this file system.
  		 * If it is zero a default is used.  Ditto for the default

  		 * soft and hard limit values (already done, above), and
  		 * for warnings.

  		 */
  		if (newlim->d_fieldmask & FS_DQ_BTIMER) {

  			q->qi_btimelimit = newlim->d_btimer;

  			ddq->d_btimer = cpu_to_be32(newlim->d_btimer);

  		}
  		if (newlim->d_fieldmask & FS_DQ_ITIMER) {

  			q->qi_itimelimit = newlim->d_itimer;

  			ddq->d_itimer = cpu_to_be32(newlim->d_itimer);

  		}
  		if (newlim->d_fieldmask & FS_DQ_RTBTIMER) {

  			q->qi_rtbtimelimit = newlim->d_rtbtimer;

  			ddq->d_rtbtimer = cpu_to_be32(newlim->d_rtbtimer);

  		}

  		if (newlim->d_fieldmask & FS_DQ_BWARNS)

  			q->qi_bwarnlimit = newlim->d_bwarns;

  		if (newlim->d_fieldmask & FS_DQ_IWARNS)

  			q->qi_iwarnlimit = newlim->d_iwarns;

  		if (newlim->d_fieldmask & FS_DQ_RTBWARNS)

  			q->qi_rtbwarnlimit = newlim->d_rtbwarns;

  	} else {

  		/*
  		 * If the user is now over quota, start the timelimit.
  		 * The user will not be 'warned'.
  		 * Note that we keep the timers ticking, whether enforcement
  		 * is on or off. We don't really want to bother with iterating
  		 * over all ondisk dquots and turning the timers on/off.
  		 */
  		xfs_qm_adjust_dqtimers(mp, ddq);
  	}
  	dqp->dq_flags |= XFS_DQ_DIRTY;
  	xfs_trans_log_dquot(tp, dqp);

  	error = xfs_trans_commit(tp, 0);

  	xfs_qm_dqrele(dqp);

   out_unlock:
  	mutex_unlock(&q->qi_quotaofflock);

  	return error;

  }

  int

  xfs_qm_scall_getquota(
  	xfs_mount_t	*mp,
  	xfs_dqid_t	id,
  	uint		type,
  	fs_disk_quota_t *out)
  {
  	xfs_dquot_t	*dqp;
  	int		error;
  
  	/*
  	 * Try to get the dquot. We don't want it allocated on disk, so
  	 * we aren't passing the XFS_QMOPT_DOALLOC flag. If it doesn't
  	 * exist, we'll get ENOENT back.
  	 */
  	if ((error = xfs_qm_dqget(mp, NULL, id, type, 0, &dqp))) {
  		return (error);
  	}

  	/*
  	 * If everything's NULL, this dquot doesn't quite exist as far as
  	 * our utility programs are concerned.
  	 */
  	if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
  		xfs_qm_dqput(dqp);
  		return XFS_ERROR(ENOENT);
  	}

  	/*
  	 * Convert the disk dquot to the exportable format
  	 */
  	xfs_qm_export_dquot(mp, &dqp->q_core, out);
  	xfs_qm_dqput(dqp);
  	return (error ? XFS_ERROR(EFAULT) : 0);
  }
  
  
  STATIC int
  xfs_qm_log_quotaoff_end(
  	xfs_mount_t		*mp,
  	xfs_qoff_logitem_t	*startqoff,
  	uint			flags)
  {

  	xfs_trans_t		*tp;

  	int			error;

  	xfs_qoff_logitem_t	*qoffi;

  
  	tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF_END);
  
  	if ((error = xfs_trans_reserve(tp, 0, sizeof(xfs_qoff_logitem_t) * 2,
  				      0, 0, XFS_DEFAULT_LOG_COUNT))) {
  		xfs_trans_cancel(tp, 0);
  		return (error);
  	}
  
  	qoffi = xfs_trans_get_qoff_item(tp, startqoff,
  					flags & XFS_ALL_QUOTA_ACCT);
  	xfs_trans_log_quotaoff_item(tp, qoffi);
  
  	/*
  	 * We have to make sure that the transaction is secure on disk before we
  	 * return and actually stop quota accounting. So, make it synchronous.
  	 * We don't care about quotoff's performance.
  	 */
  	xfs_trans_set_sync(tp);

  	error = xfs_trans_commit(tp, 0);

  	return (error);
  }
  
  
  STATIC int
  xfs_qm_log_quotaoff(
  	xfs_mount_t	       *mp,
  	xfs_qoff_logitem_t     **qoffstartp,
  	uint		       flags)
  {
  	xfs_trans_t	       *tp;
  	int			error;

  	xfs_qoff_logitem_t     *qoffi=NULL;
  	uint			oldsbqflag=0;
  
  	tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF);
  	if ((error = xfs_trans_reserve(tp, 0,
  				      sizeof(xfs_qoff_logitem_t) * 2 +
  				      mp->m_sb.sb_sectsize + 128,
  				      0,
  				      0,
  				      XFS_DEFAULT_LOG_COUNT))) {
  		goto error0;
  	}
  
  	qoffi = xfs_trans_get_qoff_item(tp, NULL, flags & XFS_ALL_QUOTA_ACCT);
  	xfs_trans_log_quotaoff_item(tp, qoffi);

  	spin_lock(&mp->m_sb_lock);

  	oldsbqflag = mp->m_sb.sb_qflags;
  	mp->m_sb.sb_qflags = (mp->m_qflags & ~(flags)) & XFS_MOUNT_QUOTA_ALL;

  	spin_unlock(&mp->m_sb_lock);

  
  	xfs_mod_sb(tp, XFS_SB_QFLAGS);
  
  	/*
  	 * We have to make sure that the transaction is secure on disk before we
  	 * return and actually stop quota accounting. So, make it synchronous.
  	 * We don't care about quotoff's performance.
  	 */
  	xfs_trans_set_sync(tp);

  	error = xfs_trans_commit(tp, 0);

  
  error0:
  	if (error) {
  		xfs_trans_cancel(tp, 0);
  		/*
  		 * No one else is modifying sb_qflags, so this is OK.
  		 * We still hold the quotaofflock.
  		 */

  		spin_lock(&mp->m_sb_lock);

  		mp->m_sb.sb_qflags = oldsbqflag;

  		spin_unlock(&mp->m_sb_lock);

  	}
  	*qoffstartp = qoffi;
  	return (error);
  }
  
  
  /*
   * Translate an internal style on-disk-dquot to the exportable format.
   * The main differences are that the counters/limits are all in Basic
   * Blocks (BBs) instead of the internal FSBs, and all on-disk data has
   * to be converted to the native endianness.
   */
  STATIC void
  xfs_qm_export_dquot(
  	xfs_mount_t		*mp,
  	xfs_disk_dquot_t	*src,
  	struct fs_disk_quota	*dst)
  {
  	memset(dst, 0, sizeof(*dst));
  	dst->d_version = FS_DQUOT_VERSION;  /* different from src->d_version */

  	dst->d_flags = xfs_qm_export_qtype_flags(src->d_flags);
  	dst->d_id = be32_to_cpu(src->d_id);
  	dst->d_blk_hardlimit =
  		XFS_FSB_TO_BB(mp, be64_to_cpu(src->d_blk_hardlimit));
  	dst->d_blk_softlimit =
  		XFS_FSB_TO_BB(mp, be64_to_cpu(src->d_blk_softlimit));
  	dst->d_ino_hardlimit = be64_to_cpu(src->d_ino_hardlimit);
  	dst->d_ino_softlimit = be64_to_cpu(src->d_ino_softlimit);
  	dst->d_bcount = XFS_FSB_TO_BB(mp, be64_to_cpu(src->d_bcount));
  	dst->d_icount = be64_to_cpu(src->d_icount);
  	dst->d_btimer = be32_to_cpu(src->d_btimer);
  	dst->d_itimer = be32_to_cpu(src->d_itimer);
  	dst->d_iwarns = be16_to_cpu(src->d_iwarns);
  	dst->d_bwarns = be16_to_cpu(src->d_bwarns);
  	dst->d_rtb_hardlimit =
  		XFS_FSB_TO_BB(mp, be64_to_cpu(src->d_rtb_hardlimit));
  	dst->d_rtb_softlimit =
  		XFS_FSB_TO_BB(mp, be64_to_cpu(src->d_rtb_softlimit));
  	dst->d_rtbcount = XFS_FSB_TO_BB(mp, be64_to_cpu(src->d_rtbcount));
  	dst->d_rtbtimer = be32_to_cpu(src->d_rtbtimer);
  	dst->d_rtbwarns = be16_to_cpu(src->d_rtbwarns);

  
  	/*
  	 * Internally, we don't reset all the timers when quota enforcement

  	 * gets turned off. No need to confuse the user level code,

  	 * so return zeroes in that case.
  	 */

  	if ((!XFS_IS_UQUOTA_ENFORCED(mp) && src->d_flags == XFS_DQ_USER) ||
  	    (!XFS_IS_OQUOTA_ENFORCED(mp) &&
  			(src->d_flags & (XFS_DQ_PROJ | XFS_DQ_GROUP)))) {

  		dst->d_btimer = 0;
  		dst->d_itimer = 0;
  		dst->d_rtbtimer = 0;
  	}
  
  #ifdef DEBUG

  	if (((XFS_IS_UQUOTA_ENFORCED(mp) && dst->d_flags == FS_USER_QUOTA) ||

  	     (XFS_IS_OQUOTA_ENFORCED(mp) &&

  			(dst->d_flags & (FS_PROJ_QUOTA | FS_GROUP_QUOTA)))) &&

  	    dst->d_id != 0) {

  		if (((int) dst->d_bcount >= (int) dst->d_blk_softlimit) &&
  		    (dst->d_blk_softlimit > 0)) {
  			ASSERT(dst->d_btimer != 0);
  		}
  		if (((int) dst->d_icount >= (int) dst->d_ino_softlimit) &&
  		    (dst->d_ino_softlimit > 0)) {
  			ASSERT(dst->d_itimer != 0);
  		}
  	}
  #endif
  }
  
  STATIC uint

  xfs_qm_export_qtype_flags(
  	uint flags)
  {
  	/*

  	 * Can't be more than one, or none.

  	 */

  	ASSERT((flags & (FS_PROJ_QUOTA | FS_USER_QUOTA)) !=
  		(FS_PROJ_QUOTA | FS_USER_QUOTA));
  	ASSERT((flags & (FS_PROJ_QUOTA | FS_GROUP_QUOTA)) !=
  		(FS_PROJ_QUOTA | FS_GROUP_QUOTA));
  	ASSERT((flags & (FS_USER_QUOTA | FS_GROUP_QUOTA)) !=
  		(FS_USER_QUOTA | FS_GROUP_QUOTA));
  	ASSERT((flags & (FS_PROJ_QUOTA|FS_USER_QUOTA|FS_GROUP_QUOTA)) != 0);

  
  	return (flags & XFS_DQ_USER) ?

  		FS_USER_QUOTA : (flags & XFS_DQ_PROJ) ?
  			FS_PROJ_QUOTA : FS_GROUP_QUOTA;

  }
  
  STATIC uint

  xfs_qm_export_flags(
  	uint flags)
  {
  	uint uflags;
  
  	uflags = 0;
  	if (flags & XFS_UQUOTA_ACCT)

  		uflags |= FS_QUOTA_UDQ_ACCT;

  	if (flags & XFS_PQUOTA_ACCT)

  		uflags |= FS_QUOTA_PDQ_ACCT;

  	if (flags & XFS_GQUOTA_ACCT)

  		uflags |= FS_QUOTA_GDQ_ACCT;

  	if (flags & XFS_UQUOTA_ENFD)

  		uflags |= FS_QUOTA_UDQ_ENFD;

  	if (flags & (XFS_OQUOTA_ENFD)) {
  		uflags |= (flags & XFS_GQUOTA_ACCT) ?

  			FS_QUOTA_GDQ_ENFD : FS_QUOTA_PDQ_ENFD;

  	}

  	return (uflags);
  }

  STATIC int
  xfs_dqrele_inode(
  	struct xfs_inode	*ip,
  	struct xfs_perag	*pag,
  	int			flags)

  {

  	/* skip quota inodes */

  	if (ip == ip->i_mount->m_quotainfo->qi_uquotaip ||
  	    ip == ip->i_mount->m_quotainfo->qi_gquotaip) {

  		ASSERT(ip->i_udquot == NULL);
  		ASSERT(ip->i_gdquot == NULL);

  		return 0;
  	}

  	xfs_ilock(ip, XFS_ILOCK_EXCL);
  	if ((flags & XFS_UQUOTA_ACCT) && ip->i_udquot) {
  		xfs_qm_dqrele(ip->i_udquot);
  		ip->i_udquot = NULL;
  	}
  	if (flags & (XFS_PQUOTA_ACCT|XFS_GQUOTA_ACCT) && ip->i_gdquot) {
  		xfs_qm_dqrele(ip->i_gdquot);
  		ip->i_gdquot = NULL;
  	}

  	xfs_iunlock(ip, XFS_ILOCK_EXCL);

  	return 0;

  }

  /*
   * Go thru all the inodes in the file system, releasing their dquots.

   *

   * Note that the mount structure gets modified to indicate that quotas are off

   * AFTER this, in the case of quotaoff.

   */
  void
  xfs_qm_dqrele_all_inodes(
  	struct xfs_mount *mp,
  	uint		 flags)
  {

  	ASSERT(mp->m_quotainfo);

  	xfs_inode_ag_iterator(mp, xfs_dqrele_inode, flags);

  }