Commit 9d40fba8 authored Dec 10, 2017 by Darrick J. Wong

xfs: avoid infinite loop when cancelling CoW blocks after writeback failure



When we're cancelling a cow range, we don't always delete each extent
that we iterate, so we have to move icur backwards in the list to avoid
an infinite loop.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

parent 73353f48

fs/xfs/xfs_reflink.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -611,6 +611,9 @@ xfs_reflink_cancel_cow_blocks(

		/* 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))