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SUNRPC: Use RCU to dereference the rpc_clnt.cl_xprt field

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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>
This commit is contained in:
Trond Myklebust
2012-03-01 17:00:56 -05:00
parent a3ca5651cb
commit 2446ab6070
13 changed files with 175 additions and 50 deletions
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4
net/sunrpc/auth_gss/auth_gss.c
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@@ -799,7 +799,7 @@ err_unlink_pipe_1:
static void gss_pipes_dentries_destroy_net(struct rpc_clnt *clnt,
struct rpc_auth *auth)
{
struct net *net = clnt->cl_xprt->xprt_net;
struct net *net = rpc_net_ns(clnt);
struct super_block *sb;
sb = rpc_get_sb_net(net);
@@ -813,7 +813,7 @@ static void gss_pipes_dentries_destroy_net(struct rpc_clnt *clnt,
static int gss_pipes_dentries_create_net(struct rpc_clnt *clnt,
struct rpc_auth *auth)
{
struct net *net = clnt->cl_xprt->xprt_net;
struct net *net = rpc_net_ns(clnt);
struct super_block *sb;
int err = 0;