splice: export do_tee()

export do_tee() for use in io_uring
Signed-off-by: NPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

fs/splice.c

@@ -1754,8 +1754,7 @@ static int link_pipe(struct pipe_inode_info *ipipe,
  * The 'flags' used are the SPLICE_F_* variants, currently the only
  * applicable one is SPLICE_F_NONBLOCK.
  */
-static long do_tee(struct file *in, struct file *out, size_t len,
-		   unsigned int flags)
+long do_tee(struct file *in, struct file *out, size_t len, unsigned int flags)
 {
 	struct pipe_inode_info *ipipe = get_pipe_info(in);
 	struct pipe_inode_info *opipe = get_pipe_info(out);

include/linux/splice.h

@@ -82,6 +82,9 @@ extern long do_splice(struct file *in, loff_t __user *off_in,
 		      struct file *out, loff_t __user *off_out,
 		      size_t len, unsigned int flags);
 
+extern long do_tee(struct file *in, struct file *out, size_t len,
+		   unsigned int flags);
+
 /*
  * for dynamic pipe sizing
  */