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authorChuck Lever <chuck.lever@oracle.com>2014-03-12 12:51:47 -0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-03-17 16:04:54 -0400
commit706cb8db3b629f6021499a5edfdde526a3cf7d95 (patch)
treeee25472dbcd7be6e96f72e16f7b977aaeb1694d0 /fs/nfs
parent3a0799a94c0384a3b275a73267aaa10517b1bf7d (diff)
downloadlinux-706cb8db3b629f6021499a5edfdde526a3cf7d95.tar.bz2
NFS: advertise only supported callback netids
NFSv4.0 clients use the SETCLIENTID operation to inform NFS servers how to contact a client's callback service. If a server cannot contact a client's callback service, that server will not delegate to that client, which results in a performance loss. Our client advertises "rdma" as the callback netid when the forward channel is "rdma". But our client always starts only "tcp" and "tcp6" callback services. Instead of advertising the forward channel netid, advertise "tcp" or "tcp6" as the callback netid, based on the value of the clientaddr mount option, since those are what our client currently supports. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=69171 Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/nfs4proc.c24
1 files changed, 18 insertions, 6 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 025116c66fef..c866e325577f 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4881,6 +4881,20 @@ nfs4_init_uniform_client_string(const struct nfs_client *clp,
nodename);
}
+/*
+ * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
+ * services. Advertise one based on the address family of the
+ * clientaddr.
+ */
+static unsigned int
+nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
+{
+ if (strchr(clp->cl_ipaddr, ':') != NULL)
+ return scnprintf(buf, len, "tcp6");
+ else
+ return scnprintf(buf, len, "tcp");
+}
+
/**
* nfs4_proc_setclientid - Negotiate client ID
* @clp: state data structure
@@ -4922,12 +4936,10 @@ int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
setclientid.sc_name,
sizeof(setclientid.sc_name));
/* cb_client4 */
- rcu_read_lock();
- setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
- sizeof(setclientid.sc_netid), "%s",
- rpc_peeraddr2str(clp->cl_rpcclient,
- RPC_DISPLAY_NETID));
- rcu_read_unlock();
+ setclientid.sc_netid_len =
+ nfs4_init_callback_netid(clp,
+ setclientid.sc_netid,
+ sizeof(setclientid.sc_netid));
setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
sizeof(setclientid.sc_uaddr), "%s.%u.%u",
clp->cl_ipaddr, port >> 8, port & 255);