md: expedite metadata update when switching read-auto -> active

[firefly-linux-kernel-4.4.55.git] / drivers / md / md.c

diff --git a/drivers/md/md.c b/drivers/md/md.c
index f363135144f62fe4ea9cdb4abf4ad5b6bdcf80cf..fcb878f88796c8ab884da058b36ea5f287fe2eab 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6532,7 +6532,17 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
                        mddev->ro = 0;
                        sysfs_notify_dirent_safe(mddev->sysfs_state);
                        set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-                       md_wakeup_thread(mddev->thread);
+                       /* mddev_unlock will wake thread */
+                       /* If a device failed while we were read-only, we
+                        * need to make sure the metadata is updated now.
+                        */
+                       if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
+                               mddev_unlock(mddev);
+                               wait_event(mddev->sb_wait,
+                                          !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
+                                          !test_bit(MD_CHANGE_PENDING, &mddev->flags));
+                               mddev_lock(mddev);
+                       }
                } else {
                        err = -EROFS;
                        goto abort_unlock;