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@xxxxxxxxxxxx>
---
drivers/md/raid5.c | 1 +
include/linux/llist.h | 1 +
lib/llist.c | 27 +++++++++++++++++++++++++++
3 files changed, 29 insertions(+)
Index: linux/include/linux/llist.h
===================================================================
--- linux.orig/include/linux/llist.h 2013-07-24 09:09:41.014384439 +0800
+++ linux/include/linux/llist.h 2013-07-25 15:09:03.109026773 +0800
@@ -172,4 +172,5 @@ static inline struct llist_node *llist_d
extern struct llist_node *llist_del_first(struct llist_head *head);
+extern struct llist_node *llist_reverse_order(struct llist_node *head);
#endif /* LLIST_H */
Index: linux/lib/llist.c
===================================================================
--- linux.orig/lib/llist.c 2013-07-24 09:09:41.062383834 +0800
+++ linux/lib/llist.c 2013-07-25 16:08:40.096054565 +0800
@@ -81,3 +81,30 @@ struct llist_node *llist_del_first(struc
return entry;
}
EXPORT_SYMBOL_GPL(llist_del_first);
+
+/*
+ * llist_reverse_order - reverse llist order
+ * @head: list head
+ *
+ * Return reversed list head
+ */
+struct llist_node *llist_reverse_order(struct llist_node *head)
+{
+ struct llist_node *second, *third;
+
+ if (head == NULL || head->next == NULL)
+ return head;
+ second = head->next;
+ head->next = NULL;
+
+ do {
+ third = second->next;
+ second->next = head;
+
+ head = second;
+ second = third;
+ } while (second);
+
+ return head;
+}
+EXPORT_SYMBOL_GPL(llist_reverse_order);
Index: linux/drivers/md/raid5.c
===================================================================
--- linux.orig/drivers/md/raid5.c 2013-07-25 15:02:38.289865404 +0800
+++ linux/drivers/md/raid5.c 2013-07-25 15:35:33.201040089 +0800
@@ -247,6 +247,7 @@ static int release_stripe_list(struct r5
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);
--
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