[PATCH 2/4] Btrfs: use cross mount point check for cloning and deduplication

[fdmanana@kernel.org]

From: Filipe Manana <fdmanana@suse.com>

There is no reason why this check was performed for clone operations but
not for deduplication operations, after all deduplication is a special
case of cloning. So make the check happen for deduplication as well.

This check used to be done and got removed by accident in commit
2b3909f8a7fe9 ("btrfs: use new dedupe data function pointer").

Fixes: 2b3909f8a7fe9 ("btrfs: use new dedupe data function pointer").
Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
 fs/btrfs/ioctl.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 1e90d10b5638..ffe940ceb80a 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3912,12 +3912,12 @@ static int btrfs_remap_file_range_prep(struct file *file_in, loff_t pos_in,
 
 		if (btrfs_root_readonly(root_out))
 			return -EROFS;
-
-		if (file_in->f_path.mnt != file_out->f_path.mnt ||
-		    inode_in->i_sb != inode_out->i_sb)
-			return -EXDEV;
 	}
 
+	if (file_in->f_path.mnt != file_out->f_path.mnt ||
+	    inode_in->i_sb != inode_out->i_sb)
+		return -EXDEV;
+
 	if (same_inode)
 		inode_lock(inode_in);
 	else
-- 
2.11.0