splice: abstract out actor data

For direct splicing (or private splicing), the output may not be a file.
So abstract out the handling into a specified actor function and put
the data in the splice_desc structure earlier, so we can build on top
of that.

This is the first step in better splice handling for drivers, and also
for implementing vmsplice _to_ user memory.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index c8884f971228..883ba9b78d3f 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -94,13 +94,15 @@ struct splice_desc {
 
 typedef int (splice_actor)(struct pipe_inode_info *, struct pipe_buffer *,
                            struct splice_desc *);
+typedef int (splice_direct_actor)(struct pipe_inode_info *,
+                                  struct splice_desc *);
 
 extern ssize_t splice_from_pipe(struct pipe_inode_info *, struct file *,
                                 loff_t *, size_t, unsigned int,
                                 splice_actor *);
-
-extern ssize_t __splice_from_pipe(struct pipe_inode_info *, struct file *,
-                                  loff_t *, size_t, unsigned int,
-                                  splice_actor *);
+extern ssize_t __splice_from_pipe(struct pipe_inode_info *,
+                                  struct splice_desc *, splice_actor *);
+extern ssize_t splice_direct_to_actor(struct file *, struct splice_desc *,
+                                      splice_direct_actor *);
 
 #endif