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, 8 insertions, 3 deletions

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index ac6c96431bbc..93565c03d315 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1636,9 +1636,14 @@ static ssize_t __ocfs2_file_splice_write(struct pipe_inode_info *pipe,
         int ret, err;
         struct address_space *mapping = out->f_mapping;
         struct inode *inode = mapping->host;
-
-        ret = __splice_from_pipe(pipe, out, ppos, len, flags,
-                                 ocfs2_splice_write_actor);
+        struct splice_desc sd = {
+                .total_len = len,
+                .flags = flags,
+                .pos = *ppos,
+                .file = out,
+        };
+
+        ret = __splice_from_pipe(pipe, &sd, ocfs2_splice_write_actor);
         if (ret > 0) {
                 *ppos += ret;