btrfs: Check if dest_offset is block-size aligned before cloning file

We've done the check for src_offset and src_length, and We should
also check dest_offset, otherwise we'll corrupt the destination
file:

  (After cloning file1 to file2 with unaligned dest_offset)
  # cat /mnt/file2
  cat: /mnt/file2: Input/output error

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 463d91b4dd3..81b47bd8a55 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1669,12 +1669,11 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
                 olen = len = src->i_size - off;
         /* if we extend to eof, continue to block boundary */
         if (off + len == src->i_size)
-                len = ((src->i_size + bs-1) & ~(bs-1))
-                        - off;
+                len = ALIGN(src->i_size, bs) - off;
 
         /* verify the end result is block aligned */
-        if ((off & (bs-1)) ||
-            ((off + len) & (bs-1)))
+        if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
+            !IS_ALIGNED(destoff, bs))
                 goto out_unlock;
 
         /* do any pending delalloc/csum calc on src, one way or