Ejemplo n.º 1
0
STATIC int
xfs_dqrele_inode(
	struct xfs_inode	*ip,
	struct xfs_perag	*pag,
	int			flags)
{
	int			error;

	/* skip quota inodes */
	if (ip == XFS_QI_UQIP(ip->i_mount) || ip == XFS_QI_GQIP(ip->i_mount)) {
		ASSERT(ip->i_udquot == NULL);
		ASSERT(ip->i_gdquot == NULL);
		read_unlock(&pag->pag_ici_lock);
		return 0;
	}

	error = xfs_sync_inode_valid(ip, pag);
	if (error)
		return error;

	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_iput(ip, XFS_ILOCK_EXCL);

	return 0;
}
Ejemplo n.º 2
0
/*
 * 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);
}
Ejemplo n.º 3
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. This also gets called from
 * xfs_rootumount.
 */
void
xfs_qm_dqrele_all_inodes(
	struct xfs_mount *mp,
	uint		 flags)
{
	xfs_inode_t	*ip, *topino;
	uint		ireclaims;
	bhv_vnode_t	*vp;
	boolean_t	vnode_refd;

	ASSERT(mp->m_quotainfo);

	XFS_MOUNT_ILOCK(mp);
again:
	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) {
			ireclaims = mp->m_ireclaims;
			topino = mp->m_inodes;
			vp = vn_grab(vp);
			if (!vp)
				goto again;

			XFS_MOUNT_IUNLOCK(mp);
			/* XXX restart limit ? */
			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 */
			goto again;
		}
		ip = ip->i_mnext;
	} while (ip != mp->m_inodes);

	XFS_MOUNT_IUNLOCK(mp);
}