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drbd: temporarily suspend io in drbd_adm_disk_opts 

drbd_adm_disk_opts() does
	wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
	drbd_al_shrink(mdev);

If the device is very busy, this can take a very long time to succeed.
Fix this by temporarily suspending IO,
then quickly change the settings, and resume.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2012-08-20 14:54:48 +02:00 committed by Philipp Reisner
parent 4eb9b3cba0
commit 0ee98e2eb0
1 changed files with 2 additions and 0 deletions
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2
drivers/block/drbd/drbd_nl.c
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@ -1210,11 +1210,13 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
}
}
drbd_suspend_io(mdev);
wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
drbd_al_shrink(mdev);
err = drbd_check_al_size(mdev, new_disk_conf);
lc_unlock(mdev->act_log);
wake_up(&mdev->al_wait);
drbd_resume_io(mdev);
if (err) {
retcode = ERR_NOMEM;