From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Tue, 11 Feb 2014 08:30:49 +0000 (+0100)
Subject: drbd: make sure disk cleanup happens in worker context
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~74^2~46
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e334f55095b908f12c8bad991433f5d609e919d1;p=pandora-kernel.git

drbd: make sure disk cleanup happens in worker context

The recent fix to put_ldev() (correct ordering of access to local_cnt
and state.disk; memory barrier in __drbd_set_state) guarantees
that the cleanup happens exactly once.

However it does not yet guarantee that the cleanup happens from worker
context, the last put_ldev() may still happen from atomic context,
which must not happen: blkdev_put() may sleep.

Fix this by scheduling the cleanup to the worker instead,
using a couple more bits in device->flags and a new helper,
drbd_device_post_work().

Generalized the "resync progress" work to cover these new work bits.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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