On Wed, Aug 26, 2015 at 04:16:42PM +0800, Peng Tao wrote:
> Now that a few file systems are adding clone functionality, namingly
> btrfs, NFS (later in the series) and XFS
> (ttp://oss.sgi.com/archives/xfs/2015-06/msg00407.html), it makes sense
> to pull the ioctl to common code.
>
> Add vfs_file_clone_range() helper and .clone_range file operation interface
> to allow underlying filesystems to clone between regular files.
>
> The change in do_vfs_ioctl() is defered to next patch where btrfs
> .clone_range is added, just so that we don't break btrfs CLONE ioctl
> with this patch.
>
> Signed-off-by: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
> ---
> fs/ioctl.c | 24 ++++++++++++++++++++++++
> fs/read_write.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
> include/linux/fs.h | 4 ++++
> include/uapi/linux/fs.h | 9 +++++++++
> 4 files changed, 82 insertions(+)
.....
> +int vfs_file_clone_range(struct file *src_file, struct file *dst_file,
> + loff_t off, size_t len, loff_t dstoff)
> +{
> + struct inode *src_ino;
> + struct inode *dst_ino;
> + ssize_t ret;
> +
> + if (!(src_file->f_mode & FMODE_READ) ||
> + !(dst_file->f_mode & FMODE_WRITE) ||
> + (dst_file->f_flags & O_APPEND) ||
> + !src_file->f_op || !src_file->f_op->clone_range)
> + return -EINVAL;
> +
> + src_ino = file_inode(src_file);
> + dst_ino = file_inode(dst_file);
> +
> + if (S_ISDIR(src_ino->i_mode) || S_ISDIR(dst_ino->i_mode))
> + return -EISDIR;
Whacky whitespace.
Also, shouldn't this call be restricted to S_ISREG() inodes? This
only checks for directories...
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
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