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

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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>
This commit is contained in:
Darrick J. Wong 2017-12-10 18:03:55 -08:00
parent 73353f486c
commit 9d40fba8b2
1 changed files with 3 additions and 0 deletions
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fs/xfs/xfs_reflink.c
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@ -611,6 +611,9 @@ xfs_reflink_cancel_cow_blocks(
/* Remove the mapping from the CoW fork. */ /* Remove the mapping from the CoW fork. */
xfs_bmap_del_extent_cow(ip, &icur, &got, &del); xfs_bmap_del_extent_cow(ip, &icur, &got, &del);
} else {
/* Didn't do anything, push cursor back. */
xfs_iext_prev(ifp, &icur);
} }
next_extent: next_extent:
if (!xfs_iext_get_extent(ifp, &icur, &got)) if (!xfs_iext_get_extent(ifp, &icur, &got))