[PATCH 5.10 081/379] fs/pipe: move check to pipe_has_watch_queue()

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5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Max Kellermann <max.kellermann@xxxxxxxxx>

[ Upstream commit b4bd6b4bac8edd61eb8f7b836969d12c0c6af165 ]

This declutters the code by reducing the number of #ifdefs and makes
the watch_queue checks simpler.  This has no runtime effect; the
machine code is identical.

Signed-off-by: Max Kellermann <max.kellermann@xxxxxxxxx>
Message-Id: <20230921075755.1378787-2-max.kellermann@xxxxxxxxx>
Reviewed-by: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
Stable-dep-of: e95aada4cb93 ("pipe: wakeup wr_wait after setting max_usage")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/pipe.c                 | 12 +++---------
 include/linux/pipe_fs_i.h | 16 ++++++++++++++++
 2 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/fs/pipe.c b/fs/pipe.c
index dbb090e1b026..7b3e94baba21 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -435,12 +435,10 @@ pipe_write(struct kiocb *iocb, struct iov_iter *from)
 		goto out;
 	}
 
-#ifdef CONFIG_WATCH_QUEUE
-	if (pipe->watch_queue) {
+	if (pipe_has_watch_queue(pipe)) {
 		ret = -EXDEV;
 		goto out;
 	}
-#endif
 
 	/*
 	 * If it wasn't empty we try to merge new data into
@@ -1319,10 +1317,8 @@ static long pipe_set_size(struct pipe_inode_info *pipe, unsigned long arg)
 	unsigned int nr_slots, size;
 	long ret = 0;
 
-#ifdef CONFIG_WATCH_QUEUE
-	if (pipe->watch_queue)
+	if (pipe_has_watch_queue(pipe))
 		return -EBUSY;
-#endif
 
 	size = round_pipe_size(arg);
 	nr_slots = size >> PAGE_SHIFT;
@@ -1375,10 +1371,8 @@ struct pipe_inode_info *get_pipe_info(struct file *file, bool for_splice)
 
 	if (file->f_op != &pipefifo_fops || !pipe)
 		return NULL;
-#ifdef CONFIG_WATCH_QUEUE
-	if (for_splice && pipe->watch_queue)
+	if (for_splice && pipe_has_watch_queue(pipe))
 		return NULL;
-#endif
 	return pipe;
 }
 
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index ef236dbaa294..7b72d93c2653 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -124,6 +124,22 @@ struct pipe_buf_operations {
 	bool (*get)(struct pipe_inode_info *, struct pipe_buffer *);
 };
 
+/**
+ * pipe_has_watch_queue - Check whether the pipe is a watch_queue,
+ * i.e. it was created with O_NOTIFICATION_PIPE
+ * @pipe: The pipe to check
+ *
+ * Return: true if pipe is a watch queue, false otherwise.
+ */
+static inline bool pipe_has_watch_queue(const struct pipe_inode_info *pipe)
+{
+#ifdef CONFIG_WATCH_QUEUE
+	return pipe->watch_queue != NULL;
+#else
+	return false;
+#endif
+}
+
 /**
  * pipe_empty - Return true if the pipe is empty
  * @head: The pipe ring head pointer
-- 
2.43.0







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