[PATCH vfs/for-next 1/3] pipe: Move pipe wakeup helpers out of splice

[Joe Damato <jdamato@fastly.com>]

Splice code has helpers to wakeup pipe readers and writers. Move these
helpers out of splice, rename them from "wakeup_pipe_*" to
"pipe_wakeup_*" and update call sites in splice.

Signed-off-by: Joe Damato <jdamato@fastly.com>
---
 fs/pipe.c                 | 16 ++++++++++++++++
 fs/splice.c               | 34 +++++++++-------------------------
 include/linux/pipe_fs_i.h |  4 ++++
 3 files changed, 29 insertions(+), 25 deletions(-)

diff --git a/fs/pipe.c b/fs/pipe.c
index 12b22c2723b7..1f496896184b 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -1070,6 +1070,22 @@ void pipe_wait_writable(struct pipe_inode_info *pipe)
 	pipe_lock(pipe);
 }
 
+void pipe_wakeup_readers(struct pipe_inode_info *pipe)
+{
+	smp_mb();
+	if (waitqueue_active(&pipe->rd_wait))
+		wake_up_interruptible(&pipe->rd_wait);
+	kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
+}
+
+void pipe_wakeup_writers(struct pipe_inode_info *pipe)
+{
+	smp_mb();
+	if (waitqueue_active(&pipe->wr_wait))
+		wake_up_interruptible(&pipe->wr_wait);
+	kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
+}
+
 /*
  * This depends on both the wait (here) and the wakeup (wake_up_partner)
  * holding the pipe lock, so "*cnt" is stable and we know a wakeup cannot
diff --git a/fs/splice.c b/fs/splice.c
index 2898fa1e9e63..dcd594a8fc06 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -175,14 +175,6 @@ 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->rd_wait))
-		wake_up_interruptible(&pipe->rd_wait);
-	kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
-}
-
 /**
  * splice_to_pipe - fill passed data into a pipe
  * @pipe:	pipe to fill
@@ -414,14 +406,6 @@ const struct pipe_buf_operations nosteal_pipe_buf_ops = {
 };
 EXPORT_SYMBOL(nosteal_pipe_buf_ops);
 
-static void wakeup_pipe_writers(struct pipe_inode_info *pipe)
-{
-	smp_mb();
-	if (waitqueue_active(&pipe->wr_wait))
-		wake_up_interruptible(&pipe->wr_wait);
-	kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
-}
-
 /**
  * splice_from_pipe_feed - feed available data from a pipe to a file
  * @pipe:	pipe to splice from
@@ -541,7 +525,7 @@ static int splice_from_pipe_next(struct pipe_inode_info *pipe, struct splice_des
 			return -ERESTARTSYS;
 
 		if (sd->need_wakeup) {
-			wakeup_pipe_writers(pipe);
+			pipe_wakeup_writers(pipe);
 			sd->need_wakeup = false;
 		}
 
@@ -582,7 +566,7 @@ static void splice_from_pipe_begin(struct splice_desc *sd)
 static void splice_from_pipe_end(struct pipe_inode_info *pipe, struct splice_desc *sd)
 {
 	if (sd->need_wakeup)
-		wakeup_pipe_writers(pipe);
+		pipe_wakeup_writers(pipe);
 }
 
 /**
@@ -837,7 +821,7 @@ ssize_t splice_to_socket(struct pipe_inode_info *pipe, struct file *out,
 				goto out;
 
 			if (need_wakeup) {
-				wakeup_pipe_writers(pipe);
+				pipe_wakeup_writers(pipe);
 				need_wakeup = false;
 			}
 
@@ -917,7 +901,7 @@ ssize_t splice_to_socket(struct pipe_inode_info *pipe, struct file *out,
 out:
 	pipe_unlock(pipe);
 	if (need_wakeup)
-		wakeup_pipe_writers(pipe);
+		pipe_wakeup_writers(pipe);
 	return spliced ?: ret;
 }
 #endif
@@ -1295,7 +1279,7 @@ ssize_t splice_file_to_pipe(struct file *in,
 		ret = do_splice_read(in, offset, opipe, len, flags);
 	pipe_unlock(opipe);
 	if (ret > 0)
-		wakeup_pipe_readers(opipe);
+		pipe_wakeup_readers(opipe);
 	return ret;
 }
 
@@ -1558,7 +1542,7 @@ static ssize_t vmsplice_to_pipe(struct file *file, struct iov_iter *iter,
 		ret = iter_to_pipe(iter, pipe, buf_flag);
 	pipe_unlock(pipe);
 	if (ret > 0) {
-		wakeup_pipe_readers(pipe);
+		pipe_wakeup_readers(pipe);
 		fsnotify_modify(file);
 	}
 	return ret;
@@ -1844,10 +1828,10 @@ static int splice_pipe_to_pipe(struct pipe_inode_info *ipipe,
 	 * If we put data in the output pipe, wakeup any potential readers.
 	 */
 	if (ret > 0)
-		wakeup_pipe_readers(opipe);
+		pipe_wakeup_readers(opipe);
 
 	if (input_wakeup)
-		wakeup_pipe_writers(ipipe);
+		pipe_wakeup_writers(ipipe);
 
 	return ret;
 }
@@ -1935,7 +1919,7 @@ static ssize_t link_pipe(struct pipe_inode_info *ipipe,
 	 * If we put data in the output pipe, wakeup any potential readers.
 	 */
 	if (ret > 0)
-		wakeup_pipe_readers(opipe);
+		pipe_wakeup_readers(opipe);
 
 	return ret;
 }
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 8ff23bf5a819..de850ef085cb 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -267,6 +267,10 @@ void pipe_double_lock(struct pipe_inode_info *, struct pipe_inode_info *);
 void pipe_wait_readable(struct pipe_inode_info *);
 void pipe_wait_writable(struct pipe_inode_info *);
 
+/* Wake up pipe readers/writers */
+void pipe_wakeup_readers(struct pipe_inode_info *pipe);
+void pipe_wakeup_writers(struct pipe_inode_info *pipe);
+
 struct pipe_inode_info *alloc_pipe_info(void);
 void free_pipe_info(struct pipe_inode_info *);
 
-- 
2.43.0