direct_splice_actor() should not use pos in sd

direct_splice_actor() shouldn't use sd->pos, as sd->pos is for file reading,
file->f_pos should be used instead.

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
----
 fs/splice.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/splice.c b/fs/splice.c
index 9e52de5..eb602cb 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1232,7 +1232,8 @@ static int direct_splice_actor(struct pipe_inode_info *pipe,
 {
 	struct file *file = sd->u.file;
 
-	return do_splice_from(pipe, file, &sd->pos, sd->total_len, sd->flags);
+	return do_splice_from(pipe, file, &file->f_pos, sd->total_len,
+			      sd->flags);
 }
 
 /**
--
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