From e78c420bfc2608bb5f9a0b9165b1071c1e31166a Mon Sep 17 00:00:00 2001 From: Brian Foster Date: Fri, 22 Feb 2013 13:32:56 -0500 Subject: [PATCH] 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: Brian Foster Reviewed-by: Dave Chinner Signed-off-by: Ben Myers --- fs/xfs/xfs_iomap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 912d83d8860a..b0b0f448e843 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -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; } -- 2.39.5