tree fc457ab337f19aa265a3b5cc4d5bcacc5b664315
parent ef356262846eb49821db7b20a131b6573e4c7d2e
author Philipp Reisner <philipp.reisner@linbit.com> 1302731165 -0700
committer Philipp Reisner <philipp.reisner@linbit.com> 1352389517 +0100

drbd: protect all idr accesses that might sleep with drbd_cfg_rwsem

With this commit the locking for all accesses to IDRs is complete:

 * Non sleeping read accesses are protected by RCU
 * sleeping read accesses are protocted by a read lock on drbd_cfg_rwsem
 * accesses that add anything are protected by a write lock
 * accesses that remove an object are protoected by a write lock
   and a call to synchronize_rcu() after it is removed from the IDR
   and before the object is actually free()ed.

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