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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>
This commit is contained in:
Shaohua Li 2013-08-28 14:29:05 +08:00 committed by NeilBrown
parent 773ca82fa1
commit d265d9dc1d
1 changed files with 15 additions and 0 deletions
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15
drivers/md/raid5.c
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@ -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);