raid10: include bio_end_io_list in nr_queued to prevent freeze_array hang

commit 23ddba80ebe836476bb2fa1f5ef305dd1c63dc0b upstream.

This is the raid10 counterpart of the bug fixed by Nate
(raid1: include bio_end_io_list in nr_queued to prevent freeze_array hang)

Fixes: 95af587e95(md/raid10: ensure device failure recorded before write request returns)
Cc: Nate Dailey <nate.dailey@stratus.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 922b70b..8fb44da 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2241,6 +2241,7 @@ static void handle_write_completed(struct r10conf *conf, struct r10bio *r10_bio)
                if (fail) {
                        spin_lock_irq(&conf->device_lock);
                        list_add(&r10_bio->retry_list, &conf->bio_end_io_list);
                if (fail) {
                        spin_lock_irq(&conf->device_lock);
                        list_add(&r10_bio->retry_list, &conf->bio_end_io_list);

+                       conf->nr_queued++;

                        spin_unlock_irq(&conf->device_lock);
                        md_wakeup_thread(conf->mddev->thread);
                } else {
                        spin_unlock_irq(&conf->device_lock);
                        md_wakeup_thread(conf->mddev->thread);
                } else {


@@ -2267,8 +2268,10 @@ static void raid10d(struct mddev *mddev)
                LIST_HEAD(tmp);
                spin_lock_irqsave(&conf->device_lock, flags);
                if (!test_bit(MD_CHANGE_PENDING, &mddev->flags)) {
                LIST_HEAD(tmp);
                spin_lock_irqsave(&conf->device_lock, flags);
                if (!test_bit(MD_CHANGE_PENDING, &mddev->flags)) {

-                       list_add(&tmp, &conf->bio_end_io_list);
-                       list_del_init(&conf->bio_end_io_list);
+                       while (!list_empty(&conf->bio_end_io_list)) {
+                               list_move(conf->bio_end_io_list.prev, &tmp);
+                               conf->nr_queued--;
+                       }

                }
                spin_unlock_irqrestore(&conf->device_lock, flags);
                while (!list_empty(&tmp)) {
                }
                spin_unlock_irqrestore(&conf->device_lock, flags);
                while (!list_empty(&tmp)) {