Beispiel #1
0
/*
 * Cancel CoW reservations for some block range of an inode.
 *
 * If cancel_real is true this function cancels all COW fork extents for the
 * inode; if cancel_real is false, real extents are not cleared.
 */
int
xfs_reflink_cancel_cow_blocks(
	struct xfs_inode		*ip,
	struct xfs_trans		**tpp,
	xfs_fileoff_t			offset_fsb,
	xfs_fileoff_t			end_fsb,
	bool				cancel_real)
{
	struct xfs_ifork		*ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
	struct xfs_bmbt_irec		got, del;
	struct xfs_iext_cursor		icur;
	xfs_fsblock_t			firstfsb;
	struct xfs_defer_ops		dfops;
	int				error = 0;

	if (!xfs_is_reflink_inode(ip))
		return 0;
	if (!xfs_iext_lookup_extent_before(ip, ifp, &end_fsb, &icur, &got))
		return 0;

	/* Walk backwards until we're out of the I/O range... */
	while (got.br_startoff + got.br_blockcount > offset_fsb) {
		del = got;
		xfs_trim_extent(&del, offset_fsb, end_fsb - offset_fsb);

		/* Extent delete may have bumped ext forward */
		if (!del.br_blockcount) {
			xfs_iext_prev(ifp, &icur);
			goto next_extent;
		}

		trace_xfs_reflink_cancel_cow(ip, &del);

		if (isnullstartblock(del.br_startblock)) {
			error = xfs_bmap_del_extent_delay(ip, XFS_COW_FORK,
					&icur, &got, &del);
			if (error)
				break;
		} else if (del.br_state == XFS_EXT_UNWRITTEN || cancel_real) {
			xfs_trans_ijoin(*tpp, ip, 0);
			xfs_defer_init(&dfops, &firstfsb);

			/* Free the CoW orphan record. */
			error = xfs_refcount_free_cow_extent(ip->i_mount,
					&dfops, del.br_startblock,
					del.br_blockcount);
			if (error)
				break;

			xfs_bmap_add_free(ip->i_mount, &dfops,
					del.br_startblock, del.br_blockcount,
					NULL);

			/* Update quota accounting */
			xfs_trans_mod_dquot_byino(*tpp, ip, XFS_TRANS_DQ_BCOUNT,
					-(long)del.br_blockcount);

			/* Roll the transaction */
			xfs_defer_ijoin(&dfops, ip);
			error = xfs_defer_finish(tpp, &dfops);
			if (error) {
				xfs_defer_cancel(&dfops);
				break;
			}

			/* Remove the mapping from the CoW fork. */
			xfs_bmap_del_extent_cow(ip, &icur, &got, &del);
		} else {
			/* Didn't do anything, push cursor back. */
			xfs_iext_prev(ifp, &icur);
		}
next_extent:
		if (!xfs_iext_get_extent(ifp, &icur, &got))
			break;
	}

	/* clear tag if cow fork is emptied */
	if (!ifp->if_bytes)
		xfs_inode_clear_cowblocks_tag(ip);

	return error;
}
Beispiel #2
0
/*
 * Cancel CoW reservations for some block range of an inode.
 *
 * If cancel_real is true this function cancels all COW fork extents for the
 * inode; if cancel_real is false, real extents are not cleared.
 */
int
xfs_reflink_cancel_cow_blocks(
	struct xfs_inode		*ip,
	struct xfs_trans		**tpp,
	xfs_fileoff_t			offset_fsb,
	xfs_fileoff_t			end_fsb,
	bool				cancel_real)
{
	struct xfs_ifork		*ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
	struct xfs_bmbt_irec		got, del;
	xfs_extnum_t			idx;
	xfs_fsblock_t			firstfsb;
	struct xfs_defer_ops		dfops;
	int				error = 0;

	if (!xfs_is_reflink_inode(ip))
		return 0;
	if (!xfs_iext_lookup_extent(ip, ifp, offset_fsb, &idx, &got))
		return 0;

	while (got.br_startoff < end_fsb) {
		del = got;
		xfs_trim_extent(&del, offset_fsb, end_fsb - offset_fsb);
		trace_xfs_reflink_cancel_cow(ip, &del);

		if (isnullstartblock(del.br_startblock)) {
			error = xfs_bmap_del_extent_delay(ip, XFS_COW_FORK,
					&idx, &got, &del);
			if (error)
				break;
		} else if (del.br_state == XFS_EXT_UNWRITTEN || cancel_real) {
			xfs_trans_ijoin(*tpp, ip, 0);
			xfs_defer_init(&dfops, &firstfsb);

			/* Free the CoW orphan record. */
			error = xfs_refcount_free_cow_extent(ip->i_mount,
					&dfops, del.br_startblock,
					del.br_blockcount);
			if (error)
				break;

			xfs_bmap_add_free(ip->i_mount, &dfops,
					del.br_startblock, del.br_blockcount,
					NULL);

			/* Update quota accounting */
			xfs_trans_mod_dquot_byino(*tpp, ip, XFS_TRANS_DQ_BCOUNT,
					-(long)del.br_blockcount);

			/* Roll the transaction */
			xfs_defer_ijoin(&dfops, ip);
			error = xfs_defer_finish(tpp, &dfops);
			if (error) {
				xfs_defer_cancel(&dfops);
				break;
			}

			/* Remove the mapping from the CoW fork. */
			xfs_bmap_del_extent_cow(ip, &idx, &got, &del);
		}

		if (!xfs_iext_get_extent(ifp, ++idx, &got))
			break;
	}

	/* clear tag if cow fork is emptied */
	if (!ifp->if_bytes)
		xfs_inode_clear_cowblocks_tag(ip);

	return error;
}
Beispiel #3
0
/*
 * Cancel CoW reservations for some block range of an inode.
 *
 * If cancel_real is true this function cancels all COW fork extents for the
 * inode; if cancel_real is false, real extents are not cleared.
 *
 * Caller must have already joined the inode to the current transaction. The
 * inode will be joined to the transaction returned to the caller.
 */
int
xfs_reflink_cancel_cow_blocks(
	struct xfs_inode		*ip,
	struct xfs_trans		**tpp,
	xfs_fileoff_t			offset_fsb,
	xfs_fileoff_t			end_fsb,
	bool				cancel_real)
{
	struct xfs_ifork		*ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
	struct xfs_bmbt_irec		got, del;
	struct xfs_iext_cursor		icur;
	int				error = 0;

	if (!xfs_inode_has_cow_data(ip))
		return 0;
	if (!xfs_iext_lookup_extent_before(ip, ifp, &end_fsb, &icur, &got))
		return 0;

	/* Walk backwards until we're out of the I/O range... */
	while (got.br_startoff + got.br_blockcount > offset_fsb) {
		del = got;
		xfs_trim_extent(&del, offset_fsb, end_fsb - offset_fsb);

		/* Extent delete may have bumped ext forward */
		if (!del.br_blockcount) {
			xfs_iext_prev(ifp, &icur);
			goto next_extent;
		}

		trace_xfs_reflink_cancel_cow(ip, &del);

		if (isnullstartblock(del.br_startblock)) {
			error = xfs_bmap_del_extent_delay(ip, XFS_COW_FORK,
					&icur, &got, &del);
			if (error)
				break;
		} else if (del.br_state == XFS_EXT_UNWRITTEN || cancel_real) {
			ASSERT((*tpp)->t_firstblock == NULLFSBLOCK);

			/* Free the CoW orphan record. */
			error = xfs_refcount_free_cow_extent(*tpp,
					del.br_startblock, del.br_blockcount);
			if (error)
				break;

			xfs_bmap_add_free(*tpp, del.br_startblock,
					  del.br_blockcount, NULL);

			/* Roll the transaction */
			error = xfs_defer_finish(tpp);
			if (error)
				break;

			/* Remove the mapping from the CoW fork. */
			xfs_bmap_del_extent_cow(ip, &icur, &got, &del);

			/* Remove the quota reservation */
			error = xfs_trans_reserve_quota_nblks(NULL, ip,
					-(long)del.br_blockcount, 0,
					XFS_QMOPT_RES_REGBLKS);
			if (error)
				break;
		} else {
			/* Didn't do anything, push cursor back. */
			xfs_iext_prev(ifp, &icur);
		}
next_extent:
		if (!xfs_iext_get_extent(ifp, &icur, &got))
			break;
	}

	/* clear tag if cow fork is emptied */
	if (!ifp->if_bytes)
		xfs_inode_clear_cowblocks_tag(ip);
	return error;
}