[-next,4/5] md: add a new api prepare_suspend() in md_personality
Commit Message
From: Yu Kuai <yukuai3@huawei.com>
There are no functional changes, the new api will be used later to do
special handling for raid456 in md_suspend().
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
drivers/md/md.c | 4 ++++
drivers/md/md.h | 1 +
2 files changed, 5 insertions(+)
@@ -467,6 +467,10 @@ void mddev_suspend(struct mddev *mddev)
wake_up(&mddev->sb_wait);
set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
percpu_ref_kill(&mddev->active_io);
+
+ if (mddev->pers->prepare_suspend)
+ mddev->pers->prepare_suspend(mddev);
+
wait_event(mddev->sb_wait, percpu_ref_is_zero(&mddev->active_io));
mddev->pers->quiesce(mddev, 1);
clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
@@ -639,6 +639,7 @@ struct md_personality
int (*start_reshape) (struct mddev *mddev);
void (*finish_reshape) (struct mddev *mddev);
void (*update_reshape_pos) (struct mddev *mddev);
+ void (*prepare_suspend) (struct mddev *mddev);
/* quiesce suspends or resumes internal processing.
* 1 - stop new actions and wait for action io to complete
* 0 - return to normal behaviour