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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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2
fs/nfs/nfs4namespace.c
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@@ -96,8 +96,8 @@ static int nfs4_validate_fspath(struct dentry *dentry,
static size_t nfs_parse_server_name(char *string, size_t len,
struct sockaddr *sa, size_t salen, struct nfs_server *server)
{
struct net *net = rpc_net_ns(server->client);
ssize_t ret;
struct net *net = server->client->cl_xprt->xprt_net;
ret = rpc_pton(net, string, len, sa, salen);
if (ret == 0) {