NFSv4: Initialise connection to the server in nfs4_alloc_client()

Set up the connection to the NFSv4 server in nfs4_alloc_client(), before
we've added the struct nfs_client to the net-namespace's nfs_client_list
so that a downed server won't cause other mounts to hang in the trunking
detection code.

Reported-by: Michael Wakabayashi <mwakabayashi@vmware.com>
Fixes: 5c6e5b60aae4 ("NFS: Fix an Oops in the pNFS files and flexfiles connection setup to the DS")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index 4271938..28431ac 100644 (file)
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -197,8 +197,11 @@ void nfs40_shutdown_client(struct nfs_client *clp)
 
 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
 {
-       int err;
+       char buf[INET6_ADDRSTRLEN + 1];
+       const char *ip_addr = cl_init->ip_addr;
        struct nfs_client *clp = nfs_alloc_client(cl_init);
+       int err;
+
        if (IS_ERR(clp))
                return clp;
 
@@ -222,6 +225,44 @@ struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
        init_waitqueue_head(&clp->cl_lock_waitq);
 #endif
        INIT_LIST_HEAD(&clp->pending_cb_stateids);
+
+       if (cl_init->minorversion != 0)
+               __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
+       __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
+       __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
+
+       /*
+        * Set up the connection to the server before we add add to the
+        * global list.
+        */
+       err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
+       if (err == -EINVAL)
+               err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
+       if (err < 0)
+               goto error;
+
+       /* If no clientaddr= option was specified, find a usable cb address */
+       if (ip_addr == NULL) {
+               struct sockaddr_storage cb_addr;
+               struct sockaddr *sap = (struct sockaddr *)&cb_addr;
+
+               err = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
+               if (err < 0)
+                       goto error;
+               err = rpc_ntop(sap, buf, sizeof(buf));
+               if (err < 0)
+                       goto error;
+               ip_addr = (const char *)buf;
+       }
+       strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
+
+       err = nfs_idmap_new(clp);
+       if (err < 0) {
+               dprintk("%s: failed to create idmapper. Error = %d\n",
+                       __func__, err);
+               goto error;
+       }
+       __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
        return clp;
 
 error:
@@ -372,8 +413,6 @@ static int nfs4_init_client_minor_version(struct nfs_client *clp)
 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
                                    const struct nfs_client_initdata *cl_init)
 {
-       char buf[INET6_ADDRSTRLEN + 1];
-       const char *ip_addr = cl_init->ip_addr;
        struct nfs_client *old;
        int error;
 
@@ -381,43 +420,6 @@ struct nfs_client *nfs4_init_client(struct nfs_client *clp,
                /* the client is initialised already */
                return clp;
 
-       /* Check NFS protocol revision and initialize RPC op vector */
-       clp->rpc_ops = &nfs_v4_clientops;
-
-       if (clp->cl_minorversion != 0)
-               __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
-       __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
-       __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
-
-       error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
-       if (error == -EINVAL)
-               error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
-       if (error < 0)
-               goto error;
-
-       /* If no clientaddr= option was specified, find a usable cb address */
-       if (ip_addr == NULL) {
-               struct sockaddr_storage cb_addr;
-               struct sockaddr *sap = (struct sockaddr *)&cb_addr;
-
-               error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
-               if (error < 0)
-                       goto error;
-               error = rpc_ntop(sap, buf, sizeof(buf));
-               if (error < 0)
-                       goto error;
-               ip_addr = (const char *)buf;
-       }
-       strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
-
-       error = nfs_idmap_new(clp);
-       if (error < 0) {
-               dprintk("%s: failed to create idmapper. Error = %d\n",
-                       __func__, error);
-               goto error;
-       }
-       __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
-
        error = nfs4_init_client_minor_version(clp);
        if (error < 0)
                goto error;