Commit e78c420b authored by Brian Foster's avatar Brian Foster Committed by Ben Myers
Browse files

xfs: fix potential infinite loop in xfs_iomap_prealloc_size() 



If freesp == 0, we could end up in an infinite loop while squashing
the preallocation. Break the loop when we've killed the prealloc
entirely.

Signed-off-by: default avatarBrian Foster <bfoster@redhat.com>
Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
Signed-off-by: default avatarBen Myers <bpm@sgi.com>
parent 6dbe51c2

fs/xfs/xfs_iomap.c

+1 −1
Original line number Diff line number Diff line
@@ -413,7 +413,7 @@ xfs_iomap_prealloc_size( 
		 * have a large file on a small filesystem and the above

		 * lowspace thresholds are smaller than MAXEXTLEN.

		 */

		while (alloc_blocks >= freesp)

		while (alloc_blocks && alloc_blocks >= freesp)

			alloc_blocks >>= 4;

	}