On 8/8/2015 04:38, Anna Schumaker wrote:
> The NFS server will need a fallback for filesystems that don't have any
> kind of copy acceleration yet. Let's handle this by having
> vfs_copy_range() fall back to splice, enabling an in-kernel fallback for
> all filesystems.
I'd like do the job in nfsd_copy_range().
If user only want call the underlay filesystem's copy_file_range()?
want get an error if not support. But, this patch lets the syscall
to another logical of calling do_splice_direct().
thanks,
Kinglong Mee
>
> Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
> ---
> fs/read_write.c | 10 +++++++---
> 1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/fs/read_write.c b/fs/read_write.c
> index 3804547..e564a6b 100644
> --- a/fs/read_write.c
> +++ b/fs/read_write.c
> @@ -1358,7 +1358,7 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
> if (!(file_in->f_mode & FMODE_READ) ||
> !(file_out->f_mode & FMODE_WRITE) ||
> (file_out->f_flags & O_APPEND) ||
> - !file_in->f_op || !file_in->f_op->copy_file_range)
> + !file_in->f_op)
> return -EINVAL;
>
> inode_in = file_inode(file_in);
> @@ -1382,8 +1382,12 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
> if (ret)
> return ret;
>
> - ret = file_in->f_op->copy_file_range(file_in, pos_in, file_out, pos_out,
> - len, flags);
> + ret = -ENOTSUPP;
> + if (file_in->f_op->copy_file_range)
> + ret = file_in->f_op->copy_file_range(file_in, pos_in, file_out,
> + pos_out, len, flags);
> + if (ret == -ENOTSUPP)
> + ret = do_splice_direct(file_in, &pos_in, file_out, &pos_out, len, flags);
> if (ret > 0) {
> fsnotify_access(file_in);
> add_rchar(current, ret);
>
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