linux-kernel - [PATCH 0/2] NFSD: fix races in service per-net resources allocation

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Message-ID: <20130201111046.24066.72836.stgit@localhost.localdomain>
Date:	Fri, 01 Feb 2013 14:28:21 +0300
From:	Stanislav Kinsbursky <skinsbursky@...allels.com>
To:	bfields@...ldses.org, akpm@...ux-foundation.org
Cc:	linux-nfs@...r.kernel.org, Trond.Myklebust@...app.com,
	linux-kernel@...r.kernel.org, devel@...nvz.org
Subject: [PATCH 0/2] NFSD: fix races in service per-net resources allocation

After "NFS" (SUNRPC + NFSd actually) containerization work some basic
principles of SUNRPC service initialization and deinitialization has been
changed: now one service can be shared between different network namespaces
and network "resources" can be attached or detached from the running service.
This leads to races, described here:

https://bugzilla.redhat.com/show_bug.cgi?id=904870

and which this small patch set is aimed to solve by using per-cpu rw semphores
to sync per-net resources processing and shutdown.

The following series implements...

---

Stanislav Kinsbursky (2):
      per-cpu semaphores: export symbols to modules
      SUNRPC: protect transport processing with per-cpu rw semaphore


 include/linux/sunrpc/svc.h |    2 ++
 lib/Makefile               |    2 +-
 lib/percpu-rwsem.c         |    6 ++++++
 net/sunrpc/Kconfig         |    1 +
 net/sunrpc/svc.c           |    2 ++
 net/sunrpc/svc_xprt.c      |   33 +++++++++++++++++++++++++++------
 6 files changed, 39 insertions(+), 7 deletions(-)

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