Re: [PATCH v1 4/8] btrfs: Add mountpoint checking during btrfs_copy_file_range

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On Fri, Sep 04, 2015 at 04:16:58PM -0400, Anna Schumaker wrote:
> We need to verify that both the source and the destination files are
> part of the same filesystem, otherwise we can't create a reflink.
> 
> Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
> ---
>  fs/btrfs/ioctl.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> index 62ae286..9c0c955 100644
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -3856,6 +3856,10 @@ ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in,
>  {
>  	ssize_t ret;
>  
> +	if (inode_in->i_sb != inode_out->i_sb ||
> +	    file_in->f_path.mnt != file_out->f_path.mnt)
> +		return -EXDEV;

The same check exists in btrfs_clone_files (added in the previous
patch), what's the reason to add it here again?

> +
>  	ret = btrfs_clone_files(file_out, file_in, pos_in, len, pos_out);
--
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