From: Sage Weil <sage@newdream.net>
Date: Tue, 13 Apr 2010 21:07:07 +0000 (-0700)
Subject: ceph: use separate class for ceph sockets' sk_lock
X-Git-Tag: v2.6.34-rc5~17^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a6a5349d17f2a5c37079826f1a1474c3d08c6b53;p=pandora-kernel.git

ceph: use separate class for ceph sockets' sk_lock

Use a separate class for ceph sockets to prevent lockdep confusion.
Because ceph sockets only get passed kernel pointers, there is no
dependency from sk_lock -> mmap_sem.  If we share the same class as other
sockets, lockdep detects a circular dependency from

	mmap_sem (page fault) -> fs mutex -> sk_lock -> mmap_sem

because dependencies are noted from both ceph and user contexts.  Using
a separate class prevents the sk_lock(ceph) -> mmap_sem dependency and
makes lockdep happy.

Signed-off-by: Sage Weil <sage@newdream.net>
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