On Thu, Sep 29, 2016 at 08:10:14PM -0700, Darrick J. Wong wrote:
> Define two VFS functions which allow userspace to reflink a range of
> blocks between two files or to reflink one file's contents to another.
> These functions fit the new VFS ioctls that standardize the checking
> for the btrfs CLONE and CLONE RANGE ioctls.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ---
> v2: Plug into the VFS function pointers instead of handling ioctls
> directly.
> ---
> fs/xfs/xfs_file.c | 142 +++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 142 insertions(+)
>
>
> diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
> index 025d52f..3db3f34 100644
> --- a/fs/xfs/xfs_file.c
> +++ b/fs/xfs/xfs_file.c
> @@ -974,6 +974,146 @@ xfs_file_fallocate(
...
> +/* Hook up to the VFS reflink function */
> +STATIC int
> +xfs_file_share_range(
> + struct file *file_in,
> + loff_t pos_in,
> + struct file *file_out,
> + loff_t pos_out,
> + u64 len)
> +{
...
> + /* Wait for the completion of any pending IOs on srcfile */
> + ret = xfs_file_wait_for_io(inode_in, pos_in, len);
> + if (ret)
> + goto out_unlock;
> + ret = xfs_file_wait_for_io(inode_out, pos_out, len);
> + if (ret)
> + goto out_unlock;
> +
> + ret = xfs_reflink_remap_range(XFS_I(inode_in), pos_in, XFS_I(inode_out),
> + pos_out, len);
> + if (ret < 0)
> + goto out_unlock;
> +
> +out_unlock:
Nit: 'out:'
Brian
> + return ret;
> +}
> +
> +STATIC ssize_t
> +xfs_file_copy_range(
> + struct file *file_in,
> + loff_t pos_in,
> + struct file *file_out,
> + loff_t pos_out,
> + size_t len,
> + unsigned int flags)
> +{
> + int error;
> +
> + error = xfs_file_share_range(file_in, pos_in, file_out, pos_out,
> + len);
> + if (error)
> + return error;
> + return len;
> +}
> +
> +STATIC int
> +xfs_file_clone_range(
> + struct file *file_in,
> + loff_t pos_in,
> + struct file *file_out,
> + loff_t pos_out,
> + u64 len)
> +{
> + return xfs_file_share_range(file_in, pos_in, file_out, pos_out,
> + len);
> +}
>
> STATIC int
> xfs_file_open(
> @@ -1634,6 +1774,8 @@ const struct file_operations xfs_file_operations = {
> .release = xfs_file_release,
> .fsync = xfs_file_fsync,
> .fallocate = xfs_file_fallocate,
> + .copy_file_range = xfs_file_copy_range,
> + .clone_file_range = xfs_file_clone_range,
> };
>
> const struct file_operations xfs_dir_file_operations = {
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-xfs" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-xfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
