In the case that we dedupe the tail of a file, we might expand the dedupe
len out to the end of our last block. We don't want to compare data past
i_size however, so pass the original length to btrfs_cmp_data().
Signed-off-by: Mark Fasheh <mfas...@suse.de>
Reviewed-by: David Sterba <dste...@suse.cz>
---
fs/btrfs/ioctl.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 2d24ff4..2deea1f 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2933,7 +2933,8 @@ static int btrfs_extent_same(struct inode *src, u64 loff,
u64 olen,
goto out_unlock;
}
- ret = btrfs_cmp_data(src, loff, dst, dst_loff, len);
+ /* pass original length for comparison so we stay within i_size */
+ ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen);
if (ret == 0)
ret = btrfs_clone(src, dst, loff, olen, len, dst_loff);
--
2.1.2
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
