I thought I remembered Christoph (cc'd) arguing at the 2015 lsf/mm that
there were some more issues that would need to be taken care of before
we could turn on cross-device copies.
But maybe I misremember. In any case, I don't remember what the issues
were....
--b.
On Fri, Aug 19, 2016 at 01:25:03PM -0400, andros@xxxxxxxxxx wrote:
> From: Andy Adamson <andros@xxxxxxxxxxxxxxxxxxxxxxxxxx>
>
> NFSv4.2 inter server to server copy always copies across devices.
>
> Note: both btrfs and nfs have EXDEV checks in their
> copy_file_range functions.
>
> Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
> ---
> fs/read_write.c | 5 -----
> 1 file changed, 5 deletions(-)
>
> diff --git a/fs/read_write.c b/fs/read_write.c
> index 1cbab4e..a6d3350 100644
> --- a/fs/read_write.c
> +++ b/fs/read_write.c
> @@ -1483,7 +1483,6 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
> size_t len, unsigned int flags)
> {
> struct inode *inode_in = file_inode(file_in);
> - struct inode *inode_out = file_inode(file_out);
> ssize_t ret;
>
> if (flags != 0)
> @@ -1505,10 +1504,6 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
> (file_out->f_flags & O_APPEND))
> return -EBADF;
>
> - /* this could be relaxed once a method supports cross-fs copies */
> - if (inode_in->i_sb != inode_out->i_sb)
> - return -EXDEV;
> -
> if (len == 0)
> return 0;
>
> --
> 1.8.3.1
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