tree ceb03e905cdee0d06cd169f8affe46f722fd14d8
parent 1ec317d3d1f9b9ec19926fdf2fc59fa3ec8cd15d
author Andreas Gruenbacher <agruen@linbit.com> 1408034010 +0200
committer Jens Axboe <axboe@fb.com> 1448468520 -0700

drbd: Fix locking across all resources

Instead of using a rwlock for synchronizing state changes across
resources, take the request locks of all resources for global state
changes.  Use resources_mutex to serialize global state changes.

This means that taking the request lock of a resource is now enough to
prevent changes of that resource.  (Previously, a read lock on the
global state lock was needed as well.)

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