Commit b7a57cca authored Apr 25, 2017 by Martin Brandenburg Committed by Mike Marshall Apr 26, 2017

orangefs: return from orangefs_devreq_read quickly if possible



It is not necessary to take the lock and search through the request list
if the list is empty.

Signed-off-by: Martin Brandenburg <martin@omnibond.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>

parent 9d286b0d

fs/orangefs/devorangefs-req.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -180,6 +180,10 @@ static ssize_t orangefs_devreq_read(struct file *file,
		return -EINVAL;
		}

		/* Check for an empty list before locking. */
		if (list_empty(&orangefs_request_list))
		return -EAGAIN;

		restart:
		/* Get next op (if any) from top of list. */
		spin_lock(&orangefs_request_list_lock);