linux-vybrid_public/fs/xfs/quota/xfs_qm_syscalls.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 version 2 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.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.	 Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */

#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.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_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_btree.h"
#include "xfs_ialloc.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_bmap.h"
#include "xfs_bit.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_itable.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_utils.h"

#include "xfs_qm.h"

#ifdef DEBUG
# define qdprintk(s, args...)	cmn_err(CE_DEBUG, s, ## args)
#else
# define qdprintk(s, args...)	do { } while (0)
#endif

STATIC int	xfs_qm_scall_trunc_qfiles(xfs_mount_t *, uint);
STATIC int	xfs_qm_scall_getquota(xfs_mount_t *, xfs_dqid_t, uint,
					fs_disk_quota_t *);
STATIC int	xfs_qm_scall_getqstat(xfs_mount_t *, fs_quota_stat_t *);
STATIC int	xfs_qm_scall_setqlim(xfs_mount_t *, xfs_dqid_t, uint,
					fs_disk_quota_t *);
STATIC int	xfs_qm_scall_quotaon(xfs_mount_t *, uint);
STATIC int	xfs_qm_scall_quotaoff(xfs_mount_t *, uint, boolean_t);
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_import_flags(uint);
STATIC uint	xfs_qm_export_flags(uint);
STATIC uint	xfs_qm_import_qtype_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 *);


/*
 * The main distribution switch of all XFS quotactl system calls.
 */
int
xfs_qm_quotactl(
	struct bhv_desc *bdp,
	int		cmd,
	int		id,
	xfs_caddr_t	addr)
{
	xfs_mount_t	*mp;
	int		error;
	struct vfs	*vfsp;

	vfsp = bhvtovfs(bdp);
	mp = XFS_VFSTOM(vfsp);

	if (addr == NULL && cmd != Q_SYNC)
		return XFS_ERROR(EINVAL);
	if (id < 0 && cmd != Q_SYNC)
		return XFS_ERROR(EINVAL);

	/*
	 * The following commands are valid even when quotaoff.
	 */
	switch (cmd) {
	case Q_XQUOTARM:
		/*
		 * Truncate quota files. quota must be off.
		 */
		if (XFS_IS_QUOTA_ON(mp) || addr == NULL)
			return XFS_ERROR(EINVAL);
		if (vfsp->vfs_flag & VFS_RDONLY)
			return XFS_ERROR(EROFS);
		return (xfs_qm_scall_trunc_qfiles(mp,
			       xfs_qm_import_qtype_flags(*(uint *)addr)));

	case Q_XGETQSTAT:
		/*
		 * Get quota status information.
		 */
		return (xfs_qm_scall_getqstat(mp, (fs_quota_stat_t *)addr));

	case Q_XQUOTAON:
		/*
		 * QUOTAON - enabling quota enforcement.
		 * Quota accounting must be turned on at mount time.
		 */
		if (addr == NULL)
			return XFS_ERROR(EINVAL);
		if (vfsp->vfs_flag & VFS_RDONLY)
			return XFS_ERROR(EROFS);
		return (xfs_qm_scall_quotaon(mp,
					  xfs_qm_import_flags(*(uint *)addr)));

	case Q_XQUOTAOFF:
		if (vfsp->vfs_flag & VFS_RDONLY)
			return XFS_ERROR(EROFS);
		break;

	default:
		break;
	}

	if (! XFS_IS_QUOTA_ON(mp))
		return XFS_ERROR(ESRCH);

	switch (cmd) {
	case Q_XQUOTAOFF:
		if (vfsp->vfs_flag & VFS_RDONLY)
			return XFS_ERROR(EROFS);
		error = xfs_qm_scall_quotaoff(mp,
					    xfs_qm_import_flags(*(uint *)addr),
					    B_FALSE);
		break;

	case Q_XGETQUOTA:
		error = xfs_qm_scall_getquota(mp, (xfs_dqid_t)id, XFS_DQ_USER,
					(fs_disk_quota_t *)addr);
		break;
	case Q_XGETGQUOTA:
		error = xfs_qm_scall_getquota(mp, (xfs_dqid_t)id, XFS_DQ_GROUP,
					(fs_disk_quota_t *)addr);
		break;
	case Q_XGETPQUOTA:
		error = xfs_qm_scall_getquota(mp, (xfs_dqid_t)id, XFS_DQ_PROJ,
					(fs_disk_quota_t *)addr);
		break;

	case Q_XSETQLIM:
		if (vfsp->vfs_flag & VFS_RDONLY)
			return XFS_ERROR(EROFS);
		error = xfs_qm_scall_setqlim(mp, (xfs_dqid_t)id, XFS_DQ_USER,
					     (fs_disk_quota_t *)addr);
		break;
	case Q_XSETGQLIM:
		if (vfsp->vfs_flag & VFS_RDONLY)
			return XFS_ERROR(EROFS);
		error = xfs_qm_scall_setqlim(mp, (xfs_dqid_t)id, XFS_DQ_GROUP,
					     (fs_disk_quota_t *)addr);
		break;
	case Q_XSETPQLIM:
		if (vfsp->vfs_flag & VFS_RDONLY)
			return XFS_ERROR(EROFS);
		error = xfs_qm_scall_setqlim(mp, (xfs_dqid_t)id, XFS_DQ_PROJ,
					     (fs_disk_quota_t *)addr);
		break;

	default:
		error = XFS_ERROR(EINVAL);
		break;
	}

	return (error);
}

/*
 * 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.
 */
STATIC int
xfs_qm_scall_quotaoff(
	xfs_mount_t		*mp,
	uint			flags,
	boolean_t		force)
{
	uint			dqtype;
	unsigned long	s;
	int			error;
	uint			inactivate_flags;
	xfs_qoff_logitem_t	*qoffstart;
	int			nculprits;

	if (!force && !capable(CAP_SYS_ADMIN))
		return XFS_ERROR(EPERM);
	/*
	 * 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(mp->m_quotainfo);
	if (mp->m_quotainfo)
		mutex_lock(&(XFS_QI_QOFFLOCK(mp)), PINOD);

	ASSERT(mp->m_quotainfo);

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

		s = XFS_SB_LOCK(mp);
		mp->m_sb.sb_qflags = mp->m_qflags;
		XFS_SB_UNLOCK(mp, s);
		mutex_unlock(&(XFS_QI_QOFFLOCK(mp)));

		/* 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) {
		mutex_unlock(&(XFS_QI_QOFFLOCK(mp)));
		return (0);
	}

	/*
	 * Write the LI_QUOTAOFF log record, and do SB changes atomically,
	 * and synchronously.
	 */
	xfs_qm_log_quotaoff(mp, &qoffstart, flags);

	/*
	 * 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 everytime 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|XFS_QMOPT_QUOTAOFF)))
		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...
	 */
	xfs_qm_log_quotaoff_end(mp, qoffstart, flags);

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

	/*
	 * Release our quotainode references, and vn_purge them,
	 * if we don't need them anymore.
	 */
	if ((dqtype & XFS_QMOPT_UQUOTA) && XFS_QI_UQIP(mp)) {
		XFS_PURGE_INODE(XFS_QI_UQIP(mp));
		XFS_QI_UQIP(mp) = NULL;
	}
	if ((dqtype & (XFS_QMOPT_GQUOTA|XFS_QMOPT_PQUOTA)) && XFS_QI_GQIP(mp)) {
		XFS_PURGE_INODE(XFS_QI_GQIP(mp));
		XFS_QI_GQIP(mp) = NULL;
	}
	mutex_unlock(&(XFS_QI_QOFFLOCK(mp)));

	return (error);
}

STATIC int
xfs_qm_scall_trunc_qfiles(
	xfs_mount_t	*mp,
	uint		flags)
{
	int		error;
	xfs_inode_t	*qip;

	if (!capable(CAP_SYS_ADMIN))
		return XFS_ERROR(EPERM);
	error = 0;
	if (!XFS_SB_VERSION_HASQUOTA(&mp->m_sb) || flags == 0) {
		qdprintk("qtrunc flags=%x m_qflags=%x\n", flags, mp->m_qflags);
		return XFS_ERROR(EINVAL);
	}

	if ((flags & XFS_DQ_USER) && mp->m_sb.sb_uquotino != NULLFSINO) {
		error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino, 0, 0, &qip, 0);
		if (! error) {
			(void) xfs_truncate_file(mp, qip);
			VN_RELE(XFS_ITOV(qip));
		}
	}

	if ((flags & (XFS_DQ_GROUP|XFS_DQ_PROJ)) &&
	    mp->m_sb.sb_gquotino != NULLFSINO) {
		error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino, 0, 0, &qip, 0);
		if (! error) {
			(void) xfs_truncate_file(mp, qip);
			VN_RELE(XFS_ITOV(qip));
		}
	}

	return (error);
}


/*
 * Switch on (a given) quota enforcement for a filesystem.  This takes
 * effect immediately.
 * (Switching on quota accounting must be done at mount time.)
 */
STATIC int
xfs_qm_scall_quotaon(
	xfs_mount_t	*mp,
	uint		flags)
{
	int		error;
	unsigned long	s;
	uint		qf;
	uint		accflags;
	__int64_t	sbflags;

	if (!capable(CAP_SYS_ADMIN))
		return XFS_ERROR(EPERM);

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

	sbflags = 0;

	if (flags == 0) {
		qdprintk("quotaon: zero flags, m_qflags=%x\n", 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_OQUOTA_ENFD))
	    ||
	    ((flags & XFS_GQUOTA_ACCT) == 0 &&
	    (mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) == 0 &&
	    (flags & XFS_OQUOTA_ENFD))) {
		qdprintk("Can't enforce without acct, flags=%x sbflags=%x\n",
			flags, mp->m_sb.sb_qflags);
		return XFS_ERROR(EINVAL);
	}
	/*
	 * If everything's upto-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.
	 */
	s = XFS_SB_LOCK(mp);
	qf = mp->m_sb.sb_qflags;
	mp->m_sb.sb_qflags = qf | flags;
	XFS_SB_UNLOCK(mp, s);

	/*
	 * 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(&(XFS_QI_QOFFLOCK(mp)), PINOD);
	mp->m_qflags |= (flags & XFS_ALL_QUOTA_ENFD);
	mutex_unlock(&(XFS_QI_QOFFLOCK(mp)));

	return (0);
}


/*
 * Return quota status information, such as uquota-off, enforcements, etc.
 */
STATIC int
xfs_qm_scall_getqstat(
	xfs_mount_t	*mp,
	fs_quota_stat_t *out)
{
	xfs_inode_t	*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 (mp->m_quotainfo) {
		uip = mp->m_quotainfo->qi_uquotaip;
		gip = mp->m_quotainfo->qi_gquotaip;
	}
	if (!uip && mp->m_sb.sb_uquotino != NULLFSINO) {
		if (xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
					0, 0, &uip, 0) == 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) == 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)
			VN_RELE(XFS_ITOV(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)
			VN_RELE(XFS_ITOV(gip));
	}
	if (mp->m_quotainfo) {
		out->qs_incoredqs = XFS_QI_MPLNDQUOTS(mp);
		out->qs_btimelimit = XFS_QI_BTIMELIMIT(mp);
		out->qs_itimelimit = XFS_QI_ITIMELIMIT(mp);
		out->qs_rtbtimelimit = XFS_QI_RTBTIMELIMIT(mp);
		out->qs_bwarnlimit = XFS_QI_BWARNLIMIT(mp);
		out->qs_iwarnlimit = XFS_QI_IWARNLIMIT(mp);
	}
	return (0);
}

/*
 * Adjust quota limits, and start/stop timers accordingly.
 */
STATIC int
xfs_qm_scall_setqlim(
	xfs_mount_t		*mp,
	xfs_dqid_t		id,
	uint			type,
	fs_disk_quota_t		*newlim)
{
	xfs_disk_dquot_t	*ddq;
	xfs_dquot_t		*dqp;
	xfs_trans_t		*tp;
	int			error;
	xfs_qcnt_t		hard, soft;

	if (!capable(CAP_SYS_ADMIN))
		return XFS_ERROR(EPERM);

	if ((newlim->d_fieldmask &
	    (FS_DQ_LIMIT_MASK|FS_DQ_TIMER_MASK|FS_DQ_WARNS_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(&(XFS_QI_QOFFLOCK(mp)), PINOD);

	/*
	 * 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);
		mutex_unlock(&(XFS_QI_QOFFLOCK(mp)));
		ASSERT(error != ENOENT);
		return (error);
	}
	xfs_dqtrace_entry(dqp, "Q_SETQLIM: AFT DQGET");
	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) :
			INT_GET(ddq->d_blk_hardlimit, ARCH_CONVERT);
	soft = (newlim->d_fieldmask & FS_DQ_BSOFT) ?
		(xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_softlimit) :
			INT_GET(ddq->d_blk_softlimit, ARCH_CONVERT);
	if (hard == 0 || hard >= soft) {
		INT_SET(ddq->d_blk_hardlimit, ARCH_CONVERT, hard);
		INT_SET(ddq->d_blk_softlimit, ARCH_CONVERT, soft);
		if (id == 0) {
			mp->m_quotainfo->qi_bhardlimit = hard;
			mp->m_quotainfo->qi_bsoftlimit = soft;
		}
	} else {
		qdprintk("blkhard %Ld < blksoft %Ld\n", hard, soft);
	}
	hard = (newlim->d_fieldmask & FS_DQ_RTBHARD) ?
		(xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_hardlimit) :
			INT_GET(ddq->d_rtb_hardlimit, ARCH_CONVERT);
	soft = (newlim->d_fieldmask & FS_DQ_RTBSOFT) ?
		(xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_softlimit) :
			INT_GET(ddq->d_rtb_softlimit, ARCH_CONVERT);
	if (hard == 0 || hard >= soft) {
		INT_SET(ddq->d_rtb_hardlimit, ARCH_CONVERT, hard);
		INT_SET(ddq->d_rtb_softlimit, ARCH_CONVERT, soft);
		if (id == 0) {
			mp->m_quotainfo->qi_rtbhardlimit = hard;
			mp->m_quotainfo->qi_rtbsoftlimit = soft;
		}
	} else {
		qdprintk("rtbhard %Ld < rtbsoft %Ld\n", hard, soft);
	}

	hard = (newlim->d_fieldmask & FS_DQ_IHARD) ?
		(xfs_qcnt_t) newlim->d_ino_hardlimit :
			INT_GET(ddq->d_ino_hardlimit, ARCH_CONVERT);
	soft = (newlim->d_fieldmask & FS_DQ_ISOFT) ?
		(xfs_qcnt_t) newlim->d_ino_softlimit :
			INT_GET(ddq->d_ino_softlimit, ARCH_CONVERT);
	if (hard == 0 || hard >= soft) {
		INT_SET(ddq->d_ino_hardlimit, ARCH_CONVERT, hard);
		INT_SET(ddq->d_ino_softlimit, ARCH_CONVERT, soft);
		if (id == 0) {
			mp->m_quotainfo->qi_ihardlimit = hard;
			mp->m_quotainfo->qi_isoftlimit = soft;
		}
	} else {
		qdprintk("ihard %Ld < isoft %Ld\n", hard, soft);
	}

	/*
	 * Update warnings counter(s) if requested
	 */
	if (newlim->d_fieldmask & FS_DQ_BWARNS)
		INT_SET(ddq->d_bwarns, ARCH_CONVERT, newlim->d_bwarns);
	if (newlim->d_fieldmask & FS_DQ_IWARNS)
		INT_SET(ddq->d_iwarns, ARCH_CONVERT, newlim->d_iwarns);
	if (newlim->d_fieldmask & FS_DQ_RTBWARNS)
		INT_SET(ddq->d_rtbwarns, ARCH_CONVERT, 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) {
			mp->m_quotainfo->qi_btimelimit = newlim->d_btimer;
			INT_SET(ddq->d_btimer, ARCH_CONVERT, newlim->d_btimer);
		}
		if (newlim->d_fieldmask & FS_DQ_ITIMER) {
			mp->m_quotainfo->qi_itimelimit = newlim->d_itimer;
			INT_SET(ddq->d_itimer, ARCH_CONVERT, newlim->d_itimer);
		}
		if (newlim->d_fieldmask & FS_DQ_RTBTIMER) {
			mp->m_quotainfo->qi_rtbtimelimit = newlim->d_rtbtimer;
			INT_SET(ddq->d_rtbtimer, ARCH_CONVERT, newlim->d_rtbtimer);
		}
		if (newlim->d_fieldmask & FS_DQ_BWARNS)
			mp->m_quotainfo->qi_bwarnlimit = newlim->d_bwarns;
		if (newlim->d_fieldmask & FS_DQ_IWARNS)
			mp->m_quotainfo->qi_iwarnlimit = newlim->d_iwarns;
		if (newlim->d_fieldmask & FS_DQ_RTBWARNS)
			mp->m_quotainfo->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);

	xfs_dqtrace_entry(dqp, "Q_SETQLIM: COMMIT");
	xfs_trans_commit(tp, 0, NULL);
	xfs_qm_dqprint(dqp);
	xfs_qm_dqrele(dqp);
	mutex_unlock(&(XFS_QI_QOFFLOCK(mp)));

	return (0);
}

STATIC 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);
	}

	xfs_dqtrace_entry(dqp, "Q_GETQUOTA SUCCESS");
	/*
	 * 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);
	}
	/* xfs_qm_dqprint(dqp); */
	/*
	 * 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, NULL);
	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;
	unsigned long	s;
	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);

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

	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, NULL);

error0:
	if (error) {
		xfs_trans_cancel(tp, 0);
		/*
		 * No one else is modifying sb_qflags, so this is OK.
		 * We still hold the quotaofflock.
		 */
		s = XFS_SB_LOCK(mp);
		mp->m_sb.sb_qflags = oldsbqflag;
		XFS_SB_UNLOCK(mp, s);
	}
	*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(INT_GET(src->d_flags, ARCH_CONVERT));
	dst->d_id = INT_GET(src->d_id, ARCH_CONVERT);
	dst->d_blk_hardlimit = (__uint64_t)
		XFS_FSB_TO_BB(mp, INT_GET(src->d_blk_hardlimit, ARCH_CONVERT));
	dst->d_blk_softlimit = (__uint64_t)
		XFS_FSB_TO_BB(mp, INT_GET(src->d_blk_softlimit, ARCH_CONVERT));
	dst->d_ino_hardlimit = (__uint64_t)
		INT_GET(src->d_ino_hardlimit, ARCH_CONVERT);
	dst->d_ino_softlimit = (__uint64_t)
		INT_GET(src->d_ino_softlimit, ARCH_CONVERT);
	dst->d_bcount = (__uint64_t)
		XFS_FSB_TO_BB(mp, INT_GET(src->d_bcount, ARCH_CONVERT));
	dst->d_icount = (__uint64_t) INT_GET(src->d_icount, ARCH_CONVERT);
	dst->d_btimer = (__uint32_t) INT_GET(src->d_btimer, ARCH_CONVERT);
	dst->d_itimer = (__uint32_t) INT_GET(src->d_itimer, ARCH_CONVERT);
	dst->d_iwarns = INT_GET(src->d_iwarns, ARCH_CONVERT);
	dst->d_bwarns = INT_GET(src->d_bwarns, ARCH_CONVERT);

	dst->d_rtb_hardlimit = (__uint64_t)
		XFS_FSB_TO_BB(mp, INT_GET(src->d_rtb_hardlimit, ARCH_CONVERT));
	dst->d_rtb_softlimit = (__uint64_t)
		XFS_FSB_TO_BB(mp, INT_GET(src->d_rtb_softlimit, ARCH_CONVERT));
	dst->d_rtbcount = (__uint64_t)
		XFS_FSB_TO_BB(mp, INT_GET(src->d_rtbcount, ARCH_CONVERT));
	dst->d_rtbtimer = (__uint32_t) INT_GET(src->d_rtbtimer, ARCH_CONVERT);
	dst->d_rtbwarns = INT_GET(src->d_rtbwarns, ARCH_CONVERT);

	/*
	 * Internally, we don't reset all the timers when quota enforcement
	 * gets turned off. No need to confuse the userlevel code,
	 * so return zeroes in that case.
	 */
	if (! XFS_IS_QUOTA_ENFORCED(mp)) {
		dst->d_btimer = 0;
		dst->d_itimer = 0;
		dst->d_rtbtimer = 0;
	}

#ifdef DEBUG
	if (XFS_IS_QUOTA_ENFORCED(mp) && 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_import_qtype_flags(
	uint		uflags)
{
	uint		oflags = 0;

	/*
	 * Can't be more than one, or none.
	 */
	if (((uflags & (XFS_GROUP_QUOTA | XFS_USER_QUOTA)) ==
			(XFS_GROUP_QUOTA | XFS_USER_QUOTA)) ||
	    ((uflags & (XFS_GROUP_QUOTA | XFS_PROJ_QUOTA)) ==
			(XFS_GROUP_QUOTA | XFS_PROJ_QUOTA)) ||
	    ((uflags & (XFS_USER_QUOTA | XFS_PROJ_QUOTA)) ==
			(XFS_USER_QUOTA | XFS_PROJ_QUOTA)) ||
	    ((uflags & (XFS_GROUP_QUOTA|XFS_USER_QUOTA|XFS_PROJ_QUOTA)) == 0))
		return (0);

	oflags |= (uflags & XFS_USER_QUOTA) ? XFS_DQ_USER : 0;
	oflags |= (uflags & XFS_PROJ_QUOTA) ? XFS_DQ_PROJ : 0;
	oflags |= (uflags & XFS_GROUP_QUOTA) ? XFS_DQ_GROUP: 0;
	return oflags;
}

STATIC uint
xfs_qm_export_qtype_flags(
	uint flags)
{
	/*
	 * Can't be more than one, or none.
	 */
	ASSERT((flags & (XFS_PROJ_QUOTA | XFS_USER_QUOTA)) !=
		(XFS_PROJ_QUOTA | XFS_USER_QUOTA));
	ASSERT((flags & (XFS_PROJ_QUOTA | XFS_GROUP_QUOTA)) !=
		(XFS_PROJ_QUOTA | XFS_GROUP_QUOTA));
	ASSERT((flags & (XFS_USER_QUOTA | XFS_GROUP_QUOTA)) !=
		(XFS_USER_QUOTA | XFS_GROUP_QUOTA));
	ASSERT((flags & (XFS_PROJ_QUOTA|XFS_USER_QUOTA|XFS_GROUP_QUOTA)) != 0);

	return (flags & XFS_DQ_USER) ?
		XFS_USER_QUOTA : (flags & XFS_DQ_PROJ) ?
			XFS_PROJ_QUOTA : XFS_GROUP_QUOTA;
}

STATIC uint
xfs_qm_import_flags(
	uint uflags)
{
	uint flags = 0;

	if (uflags & XFS_QUOTA_UDQ_ACCT)
		flags |= XFS_UQUOTA_ACCT;
	if (uflags & XFS_QUOTA_PDQ_ACCT)
		flags |= XFS_PQUOTA_ACCT;
	if (uflags & XFS_QUOTA_GDQ_ACCT)
		flags |= XFS_GQUOTA_ACCT;
	if (uflags & XFS_QUOTA_UDQ_ENFD)
		flags |= XFS_UQUOTA_ENFD;
	if (uflags & (XFS_QUOTA_PDQ_ENFD|XFS_QUOTA_GDQ_ENFD))
		flags |= XFS_OQUOTA_ENFD;
	return (flags);
}


STATIC uint
xfs_qm_export_flags(
	uint flags)
{
	uint uflags;

	uflags = 0;
	if (flags & XFS_UQUOTA_ACCT)
		uflags |= XFS_QUOTA_UDQ_ACCT;
	if (flags & XFS_PQUOTA_ACCT)
		uflags |= XFS_QUOTA_PDQ_ACCT;
	if (flags & XFS_GQUOTA_ACCT)
		uflags |= XFS_QUOTA_GDQ_ACCT;
	if (flags & XFS_UQUOTA_ENFD)
		uflags |= XFS_QUOTA_UDQ_ENFD;
	if (flags & (XFS_OQUOTA_ENFD)) {
		uflags |= (flags & XFS_GQUOTA_ACCT) ?
			XFS_QUOTA_GDQ_ENFD : XFS_QUOTA_PDQ_ENFD;
	}
	return (uflags);
}


/*
 * 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. This also gets called from
 * xfs_rootumount.
 */
void
xfs_qm_dqrele_all_inodes(
	struct xfs_mount *mp,
	uint		 flags)
{
	vmap_t		vmap;
	xfs_inode_t	*ip, *topino;
	uint		ireclaims;
	vnode_t		*vp;
	boolean_t	vnode_refd;

	ASSERT(mp->m_quotainfo);

again:
	XFS_MOUNT_ILOCK(mp);
	ip = mp->m_inodes;
	if (ip == NULL) {
		XFS_MOUNT_IUNLOCK(mp);
		return;
	}
	do {
		/* Skip markers inserted by xfs_sync */
		if (ip->i_mount == NULL) {
			ip = ip->i_mnext;
			continue;
		}
		/* Root inode, rbmip and rsumip have associated blocks */
		if (ip == XFS_QI_UQIP(mp) || ip == XFS_QI_GQIP(mp)) {
			ASSERT(ip->i_udquot == NULL);
			ASSERT(ip->i_gdquot == NULL);
			ip = ip->i_mnext;
			continue;
		}
		vp = XFS_ITOV_NULL(ip);
		if (!vp) {
			ASSERT(ip->i_udquot == NULL);
			ASSERT(ip->i_gdquot == NULL);
			ip = ip->i_mnext;
			continue;
		}
		vnode_refd = B_FALSE;
		if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0) {
			/*
			 * Sample vp mapping while holding the mplock, lest
			 * we come across a non-existent vnode.
			 */
			VMAP(vp, vmap);
			ireclaims = mp->m_ireclaims;
			topino = mp->m_inodes;
			XFS_MOUNT_IUNLOCK(mp);

			/* XXX restart limit ? */
			if ( ! (vp = vn_get(vp, &vmap)))
				goto again;
			xfs_ilock(ip, XFS_ILOCK_EXCL);
			vnode_refd = B_TRUE;
		} else {
			ireclaims = mp->m_ireclaims;
			topino = mp->m_inodes;
			XFS_MOUNT_IUNLOCK(mp);
		}

		/*
		 * We don't keep the mountlock across the dqrele() call,
		 * since it can take a while..
		 */
		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);
		/*
		 * Wait until we've dropped the ilock and mountlock to
		 * do the vn_rele. Or be condemned to an eternity in the
		 * inactive code in hell.
		 */
		if (vnode_refd)
			VN_RELE(vp);
		XFS_MOUNT_ILOCK(mp);
		/*
		 * If an inode was inserted or removed, we gotta
		 * start over again.
		 */
		if (topino != mp->m_inodes || mp->m_ireclaims != ireclaims) {
			/* XXX use a sentinel */
			XFS_MOUNT_IUNLOCK(mp);
			goto again;
		}
		ip = ip->i_mnext;
	} while (ip != mp->m_inodes);

	XFS_MOUNT_IUNLOCK(mp);
}

/*------------------------------------------------------------------------*/
#ifdef DEBUG
/*
 * This contains all the test functions for XFS disk quotas.
 * Currently it does a quota accounting check. ie. it walks through
 * all inodes in the file system, calculating the dquot accounting fields,
 * and prints out any inconsistencies.
 */
xfs_dqhash_t *qmtest_udqtab;
xfs_dqhash_t *qmtest_gdqtab;
int	      qmtest_hashmask;
int	      qmtest_nfails;
mutex_t	      qcheck_lock;

#define DQTEST_HASHVAL(mp, id) (((__psunsigned_t)(mp) + \
				 (__psunsigned_t)(id)) & \
				(qmtest_hashmask - 1))

#define DQTEST_HASH(mp, id, type)   ((type & XFS_DQ_USER) ? \
				     (qmtest_udqtab + \
				      DQTEST_HASHVAL(mp, id)) : \
				     (qmtest_gdqtab + \
				      DQTEST_HASHVAL(mp, id)))

#define DQTEST_LIST_PRINT(l, NXT, title) \
{ \
	  xfs_dqtest_t	*dqp; int i = 0;\
	  cmn_err(CE_DEBUG, "%s (#%d)", title, (int) (l)->qh_nelems); \
	  for (dqp = (xfs_dqtest_t *)(l)->qh_next; dqp != NULL; \
	       dqp = (xfs_dqtest_t *)dqp->NXT) { \
		cmn_err(CE_DEBUG, "  %d. \"%d (%s)\"  bcnt = %d, icnt = %d", \
			 ++i, dqp->d_id, DQFLAGTO_TYPESTR(dqp),	     \
			 dqp->d_bcount, dqp->d_icount); } \
}

typedef struct dqtest {
	xfs_dqmarker_t	q_lists;
	xfs_dqhash_t	*q_hash;	/* the hashchain header */
	xfs_mount_t	*q_mount;	/* filesystem this relates to */
	xfs_dqid_t	d_id;		/* user id or group id */
	xfs_qcnt_t	d_bcount;	/* # disk blocks owned by the user */
	xfs_qcnt_t	d_icount;	/* # inodes owned by the user */
} xfs_dqtest_t;

STATIC void
xfs_qm_hashinsert(xfs_dqhash_t *h, xfs_dqtest_t *dqp)
{
	xfs_dquot_t *d;
	if (((d) = (h)->qh_next))
		(d)->HL_PREVP = &((dqp)->HL_NEXT);
	(dqp)->HL_NEXT = d;
	(dqp)->HL_PREVP = &((h)->qh_next);
	(h)->qh_next = (xfs_dquot_t *)dqp;
	(h)->qh_version++;
	(h)->qh_nelems++;
}
STATIC void
xfs_qm_dqtest_print(
	xfs_dqtest_t	*d)
{
	cmn_err(CE_DEBUG, "-----------DQTEST DQUOT----------------");
	cmn_err(CE_DEBUG, "---- dquot ID = %d", d->d_id);
	cmn_err(CE_DEBUG, "---- fs       = 0x%p", d->q_mount);
	cmn_err(CE_DEBUG, "---- bcount   = %Lu (0x%x)",
		d->d_bcount, (int)d->d_bcount);
	cmn_err(CE_DEBUG, "---- icount   = %Lu (0x%x)",
		d->d_icount, (int)d->d_icount);
	cmn_err(CE_DEBUG, "---------------------------");
}

STATIC void
xfs_qm_dqtest_failed(
	xfs_dqtest_t	*d,
	xfs_dquot_t	*dqp,
	char		*reason,
	xfs_qcnt_t	a,
	xfs_qcnt_t	b,
	int		error)
{
	qmtest_nfails++;
	if (error)
		cmn_err(CE_DEBUG, "quotacheck failed id=%d, err=%d\nreason: %s",
		       INT_GET(d->d_id, ARCH_CONVERT), error, reason);
	else
		cmn_err(CE_DEBUG, "quotacheck failed id=%d (%s) [%d != %d]",
		       INT_GET(d->d_id, ARCH_CONVERT), reason, (int)a, (int)b);
	xfs_qm_dqtest_print(d);
	if (dqp)
		xfs_qm_dqprint(dqp);
}

STATIC int
xfs_dqtest_cmp2(
	xfs_dqtest_t	*d,
	xfs_dquot_t	*dqp)
{
	int err = 0;
	if (INT_GET(dqp->q_core.d_icount, ARCH_CONVERT) != d->d_icount) {
		xfs_qm_dqtest_failed(d, dqp, "icount mismatch",
			INT_GET(dqp->q_core.d_icount, ARCH_CONVERT),
			d->d_icount, 0);
		err++;
	}
	if (INT_GET(dqp->q_core.d_bcount, ARCH_CONVERT) != d->d_bcount) {
		xfs_qm_dqtest_failed(d, dqp, "bcount mismatch",
			INT_GET(dqp->q_core.d_bcount, ARCH_CONVERT),
			d->d_bcount, 0);
		err++;
	}
	if (INT_GET(dqp->q_core.d_blk_softlimit, ARCH_CONVERT) &&
	    INT_GET(dqp->q_core.d_bcount, ARCH_CONVERT) >=
	    INT_GET(dqp->q_core.d_blk_softlimit, ARCH_CONVERT)) {
		if (!dqp->q_core.d_btimer && dqp->q_core.d_id) {
			cmn_err(CE_DEBUG,
				"%d [%s] [0x%p] BLK TIMER NOT STARTED",
				d->d_id, DQFLAGTO_TYPESTR(d), d->q_mount);
			err++;
		}
	}
	if (INT_GET(dqp->q_core.d_ino_softlimit, ARCH_CONVERT) &&
	    INT_GET(dqp->q_core.d_icount, ARCH_CONVERT) >=
	    INT_GET(dqp->q_core.d_ino_softlimit, ARCH_CONVERT)) {
		if (!dqp->q_core.d_itimer && dqp->q_core.d_id) {
			cmn_err(CE_DEBUG,
				"%d [%s] [0x%p] INO TIMER NOT STARTED",
				d->d_id, DQFLAGTO_TYPESTR(d), d->q_mount);
			err++;
		}
	}
#ifdef QUOTADEBUG
	if (!err) {
		cmn_err(CE_DEBUG, "%d [%s] [0x%p] qchecked",
			d->d_id, DQFLAGTO_TYPESTR(d), d->q_mount);
	}
#endif
	return (err);
}

STATIC void
xfs_dqtest_cmp(
	xfs_dqtest_t	*d)
{
	xfs_dquot_t	*dqp;
	int		error;

	/* xfs_qm_dqtest_print(d); */
	if ((error = xfs_qm_dqget(d->q_mount, NULL, d->d_id, d->dq_flags, 0,
				 &dqp))) {
		xfs_qm_dqtest_failed(d, NULL, "dqget failed", 0, 0, error);
		return;
	}
	xfs_dqtest_cmp2(d, dqp);
	xfs_qm_dqput(dqp);
}

STATIC int
xfs_qm_internalqcheck_dqget(
	xfs_mount_t	*mp,
	xfs_dqid_t	id,
	uint		type,
	xfs_dqtest_t	**O_dq)
{
	xfs_dqtest_t	*d;
	xfs_dqhash_t	*h;

	h = DQTEST_HASH(mp, id, type);
	for (d = (xfs_dqtest_t *) h->qh_next; d != NULL;
	     d = (xfs_dqtest_t *) d->HL_NEXT) {
		/* DQTEST_LIST_PRINT(h, HL_NEXT, "@@@@@ dqtestlist @@@@@"); */
		if (d->d_id == id && mp == d->q_mount) {
			*O_dq = d;
			return (0);
		}
	}
	d = kmem_zalloc(sizeof(xfs_dqtest_t), KM_SLEEP);
	d->dq_flags = type;
	d->d_id = id;
	d->q_mount = mp;
	d->q_hash = h;
	xfs_qm_hashinsert(h, d);
	*O_dq = d;
	return (0);
}

STATIC void
xfs_qm_internalqcheck_get_dquots(
	xfs_mount_t	*mp,
	xfs_dqid_t	uid,
	xfs_dqid_t	projid,
	xfs_dqid_t	gid,
	xfs_dqtest_t	**ud,
	xfs_dqtest_t	**gd)
{
	if (XFS_IS_UQUOTA_ON(mp))
		xfs_qm_internalqcheck_dqget(mp, uid, XFS_DQ_USER, ud);
	if (XFS_IS_GQUOTA_ON(mp))
		xfs_qm_internalqcheck_dqget(mp, gid, XFS_DQ_GROUP, gd);
	else if (XFS_IS_PQUOTA_ON(mp))
		xfs_qm_internalqcheck_dqget(mp, projid, XFS_DQ_PROJ, gd);
}


STATIC void
xfs_qm_internalqcheck_dqadjust(
	xfs_inode_t		*ip,
	xfs_dqtest_t		*d)
{
	d->d_icount++;
	d->d_bcount += (xfs_qcnt_t)ip->i_d.di_nblocks;
}

STATIC int
xfs_qm_internalqcheck_adjust(
	xfs_mount_t	*mp,		/* mount point for filesystem */
	xfs_ino_t	ino,		/* inode number to get data for */
	void		__user *buffer,	/* not used */
	int		ubsize,		/* not used */
	void		*private_data,	/* not used */
	xfs_daddr_t	bno,		/* starting block of inode cluster */
	int		*ubused,	/* not used */
	void		*dip,		/* not used */
	int		*res)		/* bulkstat result code */
{
	xfs_inode_t		*ip;
	xfs_dqtest_t		*ud, *gd;
	uint			lock_flags;
	boolean_t		ipreleased;
	int			error;

	ASSERT(XFS_IS_QUOTA_RUNNING(mp));

	if (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino) {
		*res = BULKSTAT_RV_NOTHING;
		qdprintk("internalqcheck: ino=%llu, uqino=%llu, gqino=%llu\n",
			(unsigned long long) ino,
			(unsigned long long) mp->m_sb.sb_uquotino,
			(unsigned long long) mp->m_sb.sb_gquotino);
		return XFS_ERROR(EINVAL);
	}
	ipreleased = B_FALSE;
 again:
	lock_flags = XFS_ILOCK_SHARED;
	if ((error = xfs_iget(mp, NULL, ino, 0, lock_flags, &ip, bno))) {
		*res = BULKSTAT_RV_NOTHING;
		return (error);
	}

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

	/*
	 * This inode can have blocks after eof which can get released
	 * when we send it to inactive. Since we don't check the dquot
	 * until the after all our calculations are done, we must get rid
	 * of those now.
	 */
	if (! ipreleased) {
		xfs_iput(ip, lock_flags);
		ipreleased = B_TRUE;
		goto again;
	}
	xfs_qm_internalqcheck_get_dquots(mp,
					(xfs_dqid_t) ip->i_d.di_uid,
					(xfs_dqid_t) ip->i_d.di_projid,
					(xfs_dqid_t) ip->i_d.di_gid,
					&ud, &gd);
	if (XFS_IS_UQUOTA_ON(mp)) {
		ASSERT(ud);
		xfs_qm_internalqcheck_dqadjust(ip, ud);
	}
	if (XFS_IS_OQUOTA_ON(mp)) {
		ASSERT(gd);
		xfs_qm_internalqcheck_dqadjust(ip, gd);
	}
	xfs_iput(ip, lock_flags);
	*res = BULKSTAT_RV_DIDONE;
	return (0);
}


/* PRIVATE, debugging */
int
xfs_qm_internalqcheck(
	xfs_mount_t	*mp)
{
	xfs_ino_t	lastino;
	int		done, count;
	int		i;
	xfs_dqtest_t	*d, *e;
	xfs_dqhash_t	*h1;
	int		error;

	lastino = 0;
	qmtest_hashmask = 32;
	count = 5;
	done = 0;
	qmtest_nfails = 0;

	if (! XFS_IS_QUOTA_ON(mp))
		return XFS_ERROR(ESRCH);

	xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
	XFS_bflush(mp->m_ddev_targp);
	xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
	XFS_bflush(mp->m_ddev_targp);

	mutex_lock(&qcheck_lock, PINOD);
	/* There should be absolutely no quota activity while this
	   is going on. */
	qmtest_udqtab = kmem_zalloc(qmtest_hashmask *
				    sizeof(xfs_dqhash_t), KM_SLEEP);
	qmtest_gdqtab = kmem_zalloc(qmtest_hashmask *
				    sizeof(xfs_dqhash_t), KM_SLEEP);
	do {
		/*
		 * Iterate thru all the inodes in the file system,
		 * adjusting the corresponding dquot counters
		 */
		if ((error = xfs_bulkstat(mp, &lastino, &count,
				 xfs_qm_internalqcheck_adjust, NULL,
				 0, NULL, BULKSTAT_FG_IGET, &done))) {
			break;
		}
	} while (! done);
	if (error) {
		cmn_err(CE_DEBUG, "Bulkstat returned error 0x%x", error);
	}
	cmn_err(CE_DEBUG, "Checking results against system dquots");
	for (i = 0; i < qmtest_hashmask; i++) {
		h1 = &qmtest_udqtab[i];
		for (d = (xfs_dqtest_t *) h1->qh_next; d != NULL; ) {
			xfs_dqtest_cmp(d);
			e = (xfs_dqtest_t *) d->HL_NEXT;
			kmem_free(d, sizeof(xfs_dqtest_t));
			d = e;
		}
		h1 = &qmtest_gdqtab[i];
		for (d = (xfs_dqtest_t *) h1->qh_next; d != NULL; ) {
			xfs_dqtest_cmp(d);
			e = (xfs_dqtest_t *) d->HL_NEXT;
			kmem_free(d, sizeof(xfs_dqtest_t));
			d = e;
		}
	}

	if (qmtest_nfails) {
		cmn_err(CE_DEBUG, "******** quotacheck failed  ********");
		cmn_err(CE_DEBUG, "failures = %d", qmtest_nfails);
	} else {
		cmn_err(CE_DEBUG, "******** quotacheck successful! ********");
	}
	kmem_free(qmtest_udqtab, qmtest_hashmask * sizeof(xfs_dqhash_t));
	kmem_free(qmtest_gdqtab, qmtest_hashmask * sizeof(xfs_dqhash_t));
	mutex_unlock(&qcheck_lock);
	return (qmtest_nfails);
}

#endif /* DEBUG */