[PATCH 6.7 005/346] pipe: wakeup wr_wait after setting max_usage

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

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

From: Lukas Schauer <lukas@xxxxxxxxxxx>

commit e95aada4cb93d42e25c30a0ef9eb2923d9711d4a upstream.

Commit c73be61cede5 ("pipe: Add general notification queue support") a
regression was introduced that would lock up resized pipes under certain
conditions. See the reproducer in [1].

The commit resizing the pipe ring size was moved to a different
function, doing that moved the wakeup for pipe->wr_wait before actually
raising pipe->max_usage. If a pipe was full before the resize occured it
would result in the wakeup never actually triggering pipe_write.

Set @max_usage and @nr_accounted before waking writers if this isn't a
watch queue.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=212295 [1]
Link: https://lore.kernel.org/r/20231201-orchideen-modewelt-e009de4562c6@brauner
Fixes: c73be61cede5 ("pipe: Add general notification queue support")
Reviewed-by: David Howells <dhowells@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Lukas Schauer <lukas@xxxxxxxxxxx>
[Christian Brauner <brauner@xxxxxxxxxx>: rewrite to account for watch queues]
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/pipe.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -1324,6 +1324,11 @@ int pipe_resize_ring(struct pipe_inode_i
 	pipe->tail = tail;
 	pipe->head = head;
 
+	if (!pipe_has_watch_queue(pipe)) {
+		pipe->max_usage = nr_slots;
+		pipe->nr_accounted = nr_slots;
+	}
+
 	spin_unlock_irq(&pipe->rd_wait.lock);
 
 	/* This might have made more room for writers */
@@ -1375,8 +1380,6 @@ static long pipe_set_size(struct pipe_in
 	if (ret < 0)
 		goto out_revert_acct;
 
-	pipe->max_usage = nr_slots;
-	pipe->nr_accounted = nr_slots;
 	return pipe->max_usage * PAGE_SIZE;
 
 out_revert_acct:






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