Fix Bug to corrupt the img file
Reproduce steps:
> dd if=/dev/zero of=btrfs-small.img bs=1M count=1
> ls -lh btrfs-small.img
-rw-rw-r--. 1 rock rock 1.0M Oct 24 09:51 btrfs-small.img
^^^
> mkfs.btrfs btrfs-small.img
-rw-rw-r--. 1 rock rock 2.0M Oct 24 09:53 btrfs-small.img
^^^
Here you can see the original img file's size goes larger to 2Mb.
Signed-off-by: Rock Lee <[email protected]>
---
utils.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/utils.c b/utils.c
index 205e667..7ba746e 100644
--- a/utils.c
+++ b/utils.c
@@ -557,6 +557,12 @@ int btrfs_prepare_device(int fd, char *file, int
zero_end, u64 *block_count_ret,
}
if (max_block_count)
block_count = min(block_count, max_block_count);
+
+ if (block_count < 2 * 1024 * 1024) {
+ fprintf(stderr, "size of %s is too small(less than
2Mb)\n", file);
+ exit(1);
+ }
+
zero_end = 1;
if (block_count < 1024 * 1024 * 1024 && !(*mixed)) {
--
1.7.9.5
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