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-rw-r--r--fs/xfs/xfs_iomap.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 55582bd6665..8a0f044750c 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -337,7 +337,12 @@ xfs_iomap_prealloc_size(
int shift = 0;
int64_t freesp;
- alloc_blocks = XFS_B_TO_FSB(mp, ip->i_size);
+ /*
+ * rounddown_pow_of_two() returns an undefined result
+ * if we pass in alloc_blocks = 0. Hence the "+ 1" to
+ * ensure we always pass in a non-zero value.
+ */
+ alloc_blocks = XFS_B_TO_FSB(mp, ip->i_size) + 1;
alloc_blocks = XFS_FILEOFF_MIN(MAXEXTLEN,
rounddown_pow_of_two(alloc_blocks));