/*
* 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;
/*
* 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_GQUOTA_CHKD | XFS_GQUOTA_ENFD);
inactivate_flags |= XFS_GQUOTA_ACTIVE;
}
if (flags & XFS_PQUOTA_ACCT) {
dqtype |= XFS_QMOPT_PQUOTA;
flags |= (XFS_PQUOTA_CHKD | XFS_PQUOTA_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.
*/
xfs_qm_dqpurge_all(mp, dqtype);
/*
* 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 all quotas are completely turned off, close shop.
*/
if (mp->m_qflags == 0) {
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) && q->qi_gquotaip) {
IRELE(q->qi_gquotaip);
q->qi_gquotaip = NULL;
}
if ((dqtype & XFS_QMOPT_PQUOTA) && q->qi_pquotaip) {
IRELE(q->qi_pquotaip);
q->qi_pquotaip = NULL;
}
out_unlock:
mutex_unlock(&q->qi_quotaofflock);
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)));
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);
}
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;
if ((mp->m_qflags & flags) == 0)
return XFS_ERROR(EEXIST);
error = 0;
flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);
ASSERT(q);
mutex_lock(&q->qi_quotaofflock);
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);
error = xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS);
return (error);
}
dqtype = 0;
inactivate_flags = 0;
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;
}
if ((mp->m_qflags & flags) == 0)
goto out_unlock;
error = xfs_qm_log_quotaoff(mp, &qoffstart, flags);
if (error)
goto out_unlock;
mp->m_qflags &= ~inactivate_flags;
xfs_qm_dqrele_all_inodes(mp, flags);
mp->m_qflags &= ~flags;
xfs_qm_dqpurge_all(mp, dqtype);
/*
* 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) {
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
goto out_unlock;
}
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);
}
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;
}
