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xfs: fix potential infinite loop in xfs_iomap_prealloc_size()

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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 <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

(cherry picked from commit e78c420bfc)
This commit is contained in:
Brian Foster 2013-02-22 13:32:56 -05:00 committed by Ben Myers
parent 6dbe51c251
commit 83cdadd8b0
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/xfs_iomap.c
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@ -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;
}