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md: add a new api prepare_suspend() in md_personality 

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>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20230512015610.821290-5-yukuai1@huaweicloud.com
This commit is contained in:
Yu Kuai 2023-05-12 09:56:09 +08:00 committed by Song Liu
parent 431e61257d
commit 3e00777d51
2 changed files with 5 additions and 0 deletions
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4
drivers/md/md.c
View File

@ -448,6 +448,10 @@ 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);

1
drivers/md/md.h
View File

@ -631,6 +631,7 @@ 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