splice: add wakeup_pipe_readers()

Add and use wakeup_pipe_readers() to consolidate duplicated codes.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

diff --git a/fs/splice.c b/fs/splice.c
index 50a5d97..aa866d3 100644 (file)
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -162,6 +162,14 @@ static const struct pipe_buf_operations user_page_pipe_buf_ops = {
        .get = generic_pipe_buf_get,
 };
 
+static void wakeup_pipe_readers(struct pipe_inode_info *pipe)
+{
+       smp_mb();
+       if (waitqueue_active(&pipe->wait))
+               wake_up_interruptible(&pipe->wait);
+       kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
+}
+
 /**
  * splice_to_pipe - fill passed data into a pipe
  * @pipe:      pipe to fill
@@ -247,12 +255,8 @@ ssize_t splice_to_pipe(struct pipe_inode_info *pipe,
 
        pipe_unlock(pipe);
 
-       if (do_wakeup) {
-               smp_mb();
-               if (waitqueue_active(&pipe->wait))
-                       wake_up_interruptible(&pipe->wait);
-               kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
-       }
+       if (do_wakeup)
+               wakeup_pipe_readers(pipe);
 
        while (page_nr < spd_pages)
                spd->spd_release(spd, page_nr++);
@@ -1892,12 +1896,9 @@ retry:
        /*
         * If we put data in the output pipe, wakeup any potential readers.
         */
-       if (ret > 0) {
-               smp_mb();
-               if (waitqueue_active(&opipe->wait))
-                       wake_up_interruptible(&opipe->wait);
-               kill_fasync(&opipe->fasync_readers, SIGIO, POLL_IN);
-       }
+       if (ret > 0)
+               wakeup_pipe_readers(opipe);
+
        if (input_wakeup)
                wakeup_pipe_writers(ipipe);
 
@@ -1976,12 +1977,8 @@ static int link_pipe(struct pipe_inode_info *ipipe,
        /*
         * If we put data in the output pipe, wakeup any potential readers.
         */
-       if (ret > 0) {
-               smp_mb();
-               if (waitqueue_active(&opipe->wait))
-                       wake_up_interruptible(&opipe->wait);
-               kill_fasync(&opipe->fasync_readers, SIGIO, POLL_IN);
-       }
+       if (ret > 0)
+               wakeup_pipe_readers(opipe);
 
        return ret;
 }