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: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 287cc3b..d87a2de 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -239,6 +239,20 @@
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 @@
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);