STATIC void
xfs_qm_reset_dqcounts(
	xfs_mount_t	*mp,
	xfs_buf_t	*bp,
	xfs_dqid_t	id,
	uint		type)
{
	struct xfs_dqblk	*dqb;
	int			j;

	trace_xfs_reset_dqcounts(bp, _RET_IP_);

	/*
	 * Reset all counters and timers. They'll be
	 * started afresh by xfs_qm_quotacheck.
	 */
#ifdef DEBUG
	j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
	do_div(j, sizeof(xfs_dqblk_t));
	ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
#endif
	dqb = bp->b_addr;
	for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
		struct xfs_disk_dquot	*ddq;

		ddq = (struct xfs_disk_dquot *)&dqb[j];

		/*
		 * Do a sanity check, and if needed, repair the dqblk. Don't
		 * output any warnings because it's perfectly possible to
		 * find uninitialised dquot blks. See comment in xfs_dqcheck.
		 */
		xfs_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
			    "xfs_quotacheck");
		/*
		 * Reset type in case we are reusing group quota file for
		 * project quotas or vice versa
		 */
		ddq->d_flags = type;
		ddq->d_bcount = 0;
		ddq->d_icount = 0;
		ddq->d_rtbcount = 0;
		ddq->d_btimer = 0;
		ddq->d_itimer = 0;
		ddq->d_rtbtimer = 0;
		ddq->d_bwarns = 0;
		ddq->d_iwarns = 0;
		ddq->d_rtbwarns = 0;

		if (xfs_sb_version_hascrc(&mp->m_sb)) {
			xfs_update_cksum((char *)&dqb[j],
					 sizeof(struct xfs_dqblk),
					 XFS_DQUOT_CRC_OFF);
		}
	}
}
예제 #2
0
파일: xfs_dquot.c 프로젝트: MaxChina/linux
STATIC int
xfs_qm_dqrepair(
	struct xfs_mount	*mp,
	struct xfs_trans	*tp,
	struct xfs_dquot	*dqp,
	xfs_dqid_t		firstid,
	struct xfs_buf		**bpp)
{
	int			error;
	struct xfs_disk_dquot	*ddq;
	struct xfs_dqblk	*d;
	int			i;

	/*
	 * Read the buffer without verification so we get the corrupted
	 * buffer returned to us. make sure we verify it on write, though.
	 */
	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, dqp->q_blkno,
				   mp->m_quotainfo->qi_dqchunklen,
				   0, bpp, NULL);

	if (error) {
		ASSERT(*bpp == NULL);
		return XFS_ERROR(error);
	}
	(*bpp)->b_ops = &xfs_dquot_buf_ops;

	ASSERT(xfs_buf_islocked(*bpp));
	d = (struct xfs_dqblk *)(*bpp)->b_addr;

	/* Do the actual repair of dquots in this buffer */
	for (i = 0; i < mp->m_quotainfo->qi_dqperchunk; i++) {
		ddq = &d[i].dd_diskdq;
		error = xfs_dqcheck(mp, ddq, firstid + i,
				       dqp->dq_flags & XFS_DQ_ALLTYPES,
				       XFS_QMOPT_DQREPAIR, "xfs_qm_dqrepair");
		if (error) {
			/* repair failed, we're screwed */
			xfs_trans_brelse(tp, *bpp);
			return XFS_ERROR(EIO);
		}
	}

	return 0;
}
STATIC bool
xfs_dquot_buf_verify(
	struct xfs_mount	*mp,
	struct xfs_buf		*bp)
{
	struct xfs_dqblk	*d = (struct xfs_dqblk *)bp->b_addr;
	xfs_dqid_t		id = 0;
	int			ndquots;
	int			i;

	/*
	 * if we are in log recovery, the quota subsystem has not been
	 * initialised so we have no quotainfo structure. In that case, we need
	 * to manually calculate the number of dquots in the buffer.
	 */
	if (mp->m_quotainfo)
		ndquots = mp->m_quotainfo->qi_dqperchunk;
	else
		ndquots = xfs_calc_dquots_per_chunk(mp, bp->b_length);

	/*
	 * On the first read of the buffer, verify that each dquot is valid.
	 * We don't know what the id of the dquot is supposed to be, just that
	 * they should be increasing monotonically within the buffer. If the
	 * first id is corrupt, then it will fail on the second dquot in the
	 * buffer so corruptions could point to the wrong dquot in this case.
	 */
	for (i = 0; i < ndquots; i++) {
		struct xfs_disk_dquot	*ddq;
		int			error;

		ddq = &d[i].dd_diskdq;

		if (i == 0)
			id = be32_to_cpu(ddq->d_id);

		error = xfs_dqcheck(mp, ddq, id + i, 0, XFS_QMOPT_DOWARN,
				       "xfs_dquot_buf_verify");
		if (error)
			return false;
	}
	return true;
}
예제 #4
0
파일: xfs_dquot.c 프로젝트: MaxChina/linux
/*
 * Write a modified dquot to disk.
 * The dquot must be locked and the flush lock too taken by caller.
 * The flush lock will not be unlocked until the dquot reaches the disk,
 * but the dquot is free to be unlocked and modified by the caller
 * in the interim. Dquot is still locked on return. This behavior is
 * identical to that of inodes.
 */
int
xfs_qm_dqflush(
	struct xfs_dquot	*dqp,
	struct xfs_buf		**bpp)
{
	struct xfs_mount	*mp = dqp->q_mount;
	struct xfs_buf		*bp;
	struct xfs_disk_dquot	*ddqp;
	int			error;

	ASSERT(XFS_DQ_IS_LOCKED(dqp));
	ASSERT(!completion_done(&dqp->q_flush));

	trace_xfs_dqflush(dqp);

	*bpp = NULL;

	xfs_qm_dqunpin_wait(dqp);

	/*
	 * This may have been unpinned because the filesystem is shutting
	 * down forcibly. If that's the case we must not write this dquot
	 * to disk, because the log record didn't make it to disk.
	 *
	 * We also have to remove the log item from the AIL in this case,
	 * as we wait for an emptry AIL as part of the unmount process.
	 */
	if (XFS_FORCED_SHUTDOWN(mp)) {
		struct xfs_log_item	*lip = &dqp->q_logitem.qli_item;
		dqp->dq_flags &= ~XFS_DQ_DIRTY;

		spin_lock(&mp->m_ail->xa_lock);
		if (lip->li_flags & XFS_LI_IN_AIL)
			xfs_trans_ail_delete(mp->m_ail, lip,
					     SHUTDOWN_CORRUPT_INCORE);
		else
			spin_unlock(&mp->m_ail->xa_lock);
		error = XFS_ERROR(EIO);
		goto out_unlock;
	}

	/*
	 * Get the buffer containing the on-disk dquot
	 */
	error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
				   mp->m_quotainfo->qi_dqchunklen, 0, &bp, NULL);
	if (error)
		goto out_unlock;

	/*
	 * Calculate the location of the dquot inside the buffer.
	 */
	ddqp = bp->b_addr + dqp->q_bufoffset;

	/*
	 * A simple sanity check in case we got a corrupted dquot..
	 */
	error = xfs_dqcheck(mp, &dqp->q_core, be32_to_cpu(ddqp->d_id), 0,
			   XFS_QMOPT_DOWARN, "dqflush (incore copy)");
	if (error) {
		xfs_buf_relse(bp);
		xfs_dqfunlock(dqp);
		xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
		return XFS_ERROR(EIO);
	}

	/* This is the only portion of data that needs to persist */
	memcpy(ddqp, &dqp->q_core, sizeof(xfs_disk_dquot_t));

	/*
	 * Clear the dirty field and remember the flush lsn for later use.
	 */
	dqp->dq_flags &= ~XFS_DQ_DIRTY;

	xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn,
					&dqp->q_logitem.qli_item.li_lsn);

	/*
	 * copy the lsn into the on-disk dquot now while we have the in memory
	 * dquot here. This can't be done later in the write verifier as we
	 * can't get access to the log item at that point in time.
	 *
	 * We also calculate the CRC here so that the on-disk dquot in the
	 * buffer always has a valid CRC. This ensures there is no possibility
	 * of a dquot without an up-to-date CRC getting to disk.
	 */
	if (xfs_sb_version_hascrc(&mp->m_sb)) {
		struct xfs_dqblk *dqb = (struct xfs_dqblk *)ddqp;

		dqb->dd_lsn = cpu_to_be64(dqp->q_logitem.qli_item.li_lsn);
		xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk),
				 XFS_DQUOT_CRC_OFF);
	}

	/*
	 * Attach an iodone routine so that we can remove this dquot from the
	 * AIL and release the flush lock once the dquot is synced to disk.
	 */
	xfs_buf_attach_iodone(bp, xfs_qm_dqflush_done,
				  &dqp->q_logitem.qli_item);

	/*
	 * If the buffer is pinned then push on the log so we won't
	 * get stuck waiting in the write for too long.
	 */
	if (xfs_buf_ispinned(bp)) {
		trace_xfs_dqflush_force(dqp);
		xfs_log_force(mp, 0);
	}

	trace_xfs_dqflush_done(dqp);
	*bpp = bp;
	return 0;

out_unlock:
	xfs_dqfunlock(dqp);
	return XFS_ERROR(EIO);
}