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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-03-01 17:00:56 -0500 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-03-02 15:36:38 -0500 |
| commit | 2446ab6070861aba2dd9229463ffbc40016a9f33 (patch) | |
| tree | 2e366c3236788936b9f4f58c0787ae01c265f4a4 /net/sunrpc/rpc_pipe.c | |
| parent | a3ca5651cb5eebe2e56e510bbf5cd60abc301c9f (diff) | |
| download | op-kernel-dev-2446ab6070861aba2dd9229463ffbc40016a9f33.zip op-kernel-dev-2446ab6070861aba2dd9229463ffbc40016a9f33.tar.gz | |
SUNRPC: Use RCU to dereference the rpc_clnt.cl_xprt field
A migration event will replace the rpc_xprt used by an rpc_clnt. To
ensure this can be done safely, all references to cl_xprt must now use
a form of rcu_dereference().
Special care is taken with rpc_peeraddr2str(), which returns a pointer
to memory whose lifetime is the same as the rpc_xprt.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
[ cel: fix lockdep splats and layering violations ]
[ cel: forward ported to 3.4 ]
[ cel: remove rpc_max_reqs(), add rpc_net_ns() ]
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/rpc_pipe.c')
| -rw-r--r-- | net/sunrpc/rpc_pipe.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index ac9ee15..3d30943 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -16,6 +16,7 @@ #include <linux/namei.h> #include <linux/fsnotify.h> #include <linux/kernel.h> +#include <linux/rcupdate.h> #include <asm/ioctls.h> #include <linux/poll.h> @@ -402,12 +403,14 @@ rpc_show_info(struct seq_file *m, void *v) { struct rpc_clnt *clnt = m->private; + rcu_read_lock(); seq_printf(m, "RPC server: %s\n", clnt->cl_server); seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, clnt->cl_prog, clnt->cl_vers); seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); + rcu_read_unlock(); return 0; } |
