Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit d265d9dc authored by Shaohua Li's avatar Shaohua Li Committed by NeilBrown
Browse files

raid5: fix stripe release order 



patch "make release_stripe lockless" changes the order stripes are released.
Originally I thought block layer can take care of request merge, but it appears
there are still some requests not merged. It's easy to fix the order.

Signed-off-by: default avatarShaohua Li <shli@fusionio.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 773ca82f

drivers/md/raid5.c

+15 −0
Original line number Diff line number Diff line
@@ -239,6 +239,20 @@ static void __release_stripe(struct r5conf *conf, struct stripe_head *sh) 
		do_release_stripe(conf, sh);

}



static struct llist_node *llist_reverse_order(struct llist_node *head)

{

	struct llist_node *new_head = NULL;



	while (head) {

		struct llist_node *tmp = head;

		head = head->next;

		tmp->next = new_head;

		new_head = tmp;

	}



	return new_head;

}



/* should hold conf->device_lock already */

static int release_stripe_list(struct r5conf *conf)

{
@@ -247,6 +261,7 @@ static int release_stripe_list(struct r5conf *conf) 
	struct llist_node *head;



	head = llist_del_all(&conf->released_stripes);

	head = llist_reverse_order(head);

	while (head) {

		sh = llist_entry(head, struct stripe_head, release_list);

		head = llist_next(head);