2 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
3 * Written by David Howells (dhowells@redhat.com)
5 #include <linux/module.h>
6 #include <linux/nfs_fs.h>
7 #include <linux/nfs_idmap.h>
8 #include <linux/nfs_mount.h>
9 #include <linux/sunrpc/auth.h>
10 #include <linux/sunrpc/xprt.h>
11 #include <linux/sunrpc/bc_xprt.h>
14 #include "delegation.h"
15 #include "nfs4session.h"
19 #define NFSDBG_FACILITY NFSDBG_CLIENT
22 * Get a unique NFSv4.0 callback identifier which will be used
23 * by the V4.0 callback service to lookup the nfs_client struct
25 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
28 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
30 if (clp->rpc_ops->version != 4 || minorversion != 0)
32 idr_preload(GFP_KERNEL);
33 spin_lock(&nn->nfs_client_lock);
34 ret = idr_alloc(&nn->cb_ident_idr, clp, 0, 0, GFP_NOWAIT);
36 clp->cl_cb_ident = ret;
37 spin_unlock(&nn->nfs_client_lock);
39 return ret < 0 ? ret : 0;
42 #ifdef CONFIG_NFS_V4_1
43 static void nfs4_shutdown_session(struct nfs_client *clp)
45 if (nfs4_has_session(clp)) {
46 nfs4_destroy_session(clp->cl_session);
47 nfs4_destroy_clientid(clp);
51 #else /* CONFIG_NFS_V4_1 */
52 static void nfs4_shutdown_session(struct nfs_client *clp)
55 #endif /* CONFIG_NFS_V4_1 */
57 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
60 struct nfs_client *clp = nfs_alloc_client(cl_init);
64 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
68 spin_lock_init(&clp->cl_lock);
69 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
70 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
71 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
72 clp->cl_minorversion = cl_init->minorversion;
73 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
82 * Destroy the NFS4 callback service
84 static void nfs4_destroy_callback(struct nfs_client *clp)
86 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
87 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
90 static void nfs4_shutdown_client(struct nfs_client *clp)
92 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
93 nfs4_kill_renewd(clp);
94 nfs4_shutdown_session(clp);
95 nfs4_destroy_callback(clp);
96 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
97 nfs_idmap_delete(clp);
99 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
100 kfree(clp->cl_serverowner);
101 kfree(clp->cl_serverscope);
102 kfree(clp->cl_implid);
105 void nfs4_free_client(struct nfs_client *clp)
107 nfs4_shutdown_client(clp);
108 nfs_free_client(clp);
112 * Initialize the NFS4 callback service
114 static int nfs4_init_callback(struct nfs_client *clp)
118 if (clp->rpc_ops->version == 4) {
119 struct rpc_xprt *xprt;
121 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
123 if (nfs4_has_session(clp)) {
124 error = xprt_setup_backchannel(xprt,
125 NFS41_BC_MIN_CALLBACKS);
130 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
132 dprintk("%s: failed to start callback. Error = %d\n",
136 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
142 * Initialize the minor version specific parts of an NFS4 client record
144 static int nfs4_init_client_minor_version(struct nfs_client *clp)
146 #if defined(CONFIG_NFS_V4_1)
147 if (clp->cl_mvops->minor_version) {
148 struct nfs4_session *session = NULL;
150 * Create the session and mark it expired.
151 * When a SEQUENCE operation encounters the expired session
152 * it will do session recovery to initialize it.
154 session = nfs4_alloc_session(clp);
158 clp->cl_session = session;
160 * The create session reply races with the server back
161 * channel probe. Mark the client NFS_CS_SESSION_INITING
162 * so that the client back channel can find the
165 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
167 #endif /* CONFIG_NFS_V4_1 */
169 return nfs4_init_callback(clp);
173 * nfs4_init_client - Initialise an NFS4 client record
175 * @clp: nfs_client to initialise
176 * @timeparms: timeout parameters for underlying RPC transport
177 * @ip_addr: callback IP address in presentation format
178 * @authflavor: authentication flavor for underlying RPC transport
180 * Returns pointer to an NFS client, or an ERR_PTR value.
182 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
183 const struct rpc_timeout *timeparms,
185 rpc_authflavor_t authflavour)
187 char buf[INET6_ADDRSTRLEN + 1];
188 struct nfs_client *old;
191 if (clp->cl_cons_state == NFS_CS_READY) {
192 /* the client is initialised already */
193 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
197 /* Check NFS protocol revision and initialize RPC op vector */
198 clp->rpc_ops = &nfs_v4_clientops;
200 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
201 error = nfs_create_rpc_client(clp, timeparms, authflavour);
205 /* If no clientaddr= option was specified, find a usable cb address */
206 if (ip_addr == NULL) {
207 struct sockaddr_storage cb_addr;
208 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
210 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
213 error = rpc_ntop(sap, buf, sizeof(buf));
216 ip_addr = (const char *)buf;
218 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
220 error = nfs_idmap_new(clp);
222 dprintk("%s: failed to create idmapper. Error = %d\n",
226 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
228 error = nfs4_init_client_minor_version(clp);
232 if (!nfs4_has_session(clp))
233 nfs_mark_client_ready(clp, NFS_CS_READY);
235 error = nfs4_discover_server_trunking(clp, &old);
240 clp->cl_preserve_clid = true;
247 nfs_mark_client_ready(clp, error);
249 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
250 return ERR_PTR(error);
254 * SETCLIENTID just did a callback update with the callback ident in
255 * "drop," but server trunking discovery claims "drop" and "keep" are
256 * actually the same server. Swap the callback IDs so that "keep"
257 * will continue to use the callback ident the server now knows about,
258 * and so that "keep"'s original callback ident is destroyed when
261 static void nfs4_swap_callback_idents(struct nfs_client *keep,
262 struct nfs_client *drop)
264 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
265 unsigned int save = keep->cl_cb_ident;
267 if (keep->cl_cb_ident == drop->cl_cb_ident)
270 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
271 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
273 spin_lock(&nn->nfs_client_lock);
275 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
276 keep->cl_cb_ident = drop->cl_cb_ident;
278 idr_replace(&nn->cb_ident_idr, drop, save);
279 drop->cl_cb_ident = save;
281 spin_unlock(&nn->nfs_client_lock);
285 * nfs40_walk_client_list - Find server that recognizes a client ID
287 * @new: nfs_client with client ID to test
288 * @result: OUT: found nfs_client, or new
289 * @cred: credential to use for trunking test
291 * Returns zero, a negative errno, or a negative NFS4ERR status.
292 * If zero is returned, an nfs_client pointer is planted in "result."
294 * NB: nfs40_walk_client_list() relies on the new nfs_client being
295 * the last nfs_client on the list.
297 int nfs40_walk_client_list(struct nfs_client *new,
298 struct nfs_client **result,
299 struct rpc_cred *cred)
301 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
302 struct nfs_client *pos, *n, *prev = NULL;
303 struct nfs4_setclientid_res clid = {
304 .clientid = new->cl_clientid,
305 .confirm = new->cl_confirm,
307 int status = -NFS4ERR_STALE_CLIENTID;
309 spin_lock(&nn->nfs_client_lock);
310 list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
311 /* If "pos" isn't marked ready, we can't trust the
312 * remaining fields in "pos" */
313 if (pos->cl_cons_state < NFS_CS_READY)
316 if (pos->rpc_ops != new->rpc_ops)
319 if (pos->cl_proto != new->cl_proto)
322 if (pos->cl_minorversion != new->cl_minorversion)
325 if (pos->cl_clientid != new->cl_clientid)
328 atomic_inc(&pos->cl_count);
329 spin_unlock(&nn->nfs_client_lock);
332 nfs_put_client(prev);
335 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
337 case -NFS4ERR_STALE_CLIENTID:
340 nfs4_swap_callback_idents(pos, new);
344 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
345 __func__, pos, atomic_read(&pos->cl_count));
350 spin_lock(&nn->nfs_client_lock);
352 spin_unlock(&nn->nfs_client_lock);
354 /* No match found. The server lost our clientid */
357 nfs_put_client(prev);
358 dprintk("NFS: <-- %s status = %d\n", __func__, status);
362 #ifdef CONFIG_NFS_V4_1
364 * Returns true if the client IDs match
366 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
368 if (a->cl_clientid != b->cl_clientid) {
369 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
370 __func__, a->cl_clientid, b->cl_clientid);
373 dprintk("NFS: --> %s client ID %llx matches %llx\n",
374 __func__, a->cl_clientid, b->cl_clientid);
379 * Returns true if the server owners match
382 nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
384 struct nfs41_server_owner *o1 = a->cl_serverowner;
385 struct nfs41_server_owner *o2 = b->cl_serverowner;
387 if (o1->minor_id != o2->minor_id) {
388 dprintk("NFS: --> %s server owner minor IDs do not match\n",
393 if (o1->major_id_sz != o2->major_id_sz)
394 goto out_major_mismatch;
395 if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
396 goto out_major_mismatch;
398 dprintk("NFS: --> %s server owners match\n", __func__);
402 dprintk("NFS: --> %s server owner major IDs do not match\n",
408 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
410 * @new: nfs_client with client ID to test
411 * @result: OUT: found nfs_client, or new
412 * @cred: credential to use for trunking test
414 * Returns zero, a negative errno, or a negative NFS4ERR status.
415 * If zero is returned, an nfs_client pointer is planted in "result."
417 * NB: nfs41_walk_client_list() relies on the new nfs_client being
418 * the last nfs_client on the list.
420 int nfs41_walk_client_list(struct nfs_client *new,
421 struct nfs_client **result,
422 struct rpc_cred *cred)
424 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
425 struct nfs_client *pos, *n, *prev = NULL;
426 int status = -NFS4ERR_STALE_CLIENTID;
428 spin_lock(&nn->nfs_client_lock);
429 list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
430 /* If "pos" isn't marked ready, we can't trust the
431 * remaining fields in "pos", especially the client
432 * ID and serverowner fields. Wait for CREATE_SESSION
434 if (pos->cl_cons_state < NFS_CS_READY) {
435 atomic_inc(&pos->cl_count);
436 spin_unlock(&nn->nfs_client_lock);
439 nfs_put_client(prev);
442 nfs4_schedule_lease_recovery(pos);
443 status = nfs_wait_client_init_complete(pos);
446 spin_lock(&nn->nfs_client_lock);
449 status = pos->cl_cons_state;
450 spin_lock(&nn->nfs_client_lock);
455 if (pos->rpc_ops != new->rpc_ops)
458 if (pos->cl_proto != new->cl_proto)
461 if (pos->cl_minorversion != new->cl_minorversion)
464 if (!nfs4_match_clientids(pos, new))
467 if (!nfs4_match_serverowners(pos, new))
470 atomic_inc(&pos->cl_count);
471 spin_unlock(&nn->nfs_client_lock);
472 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
473 __func__, pos, atomic_read(&pos->cl_count));
479 /* No matching nfs_client found. */
480 spin_unlock(&nn->nfs_client_lock);
481 dprintk("NFS: <-- %s status = %d\n", __func__, status);
484 #endif /* CONFIG_NFS_V4_1 */
486 static void nfs4_destroy_server(struct nfs_server *server)
488 nfs_server_return_all_delegations(server);
489 unset_pnfs_layoutdriver(server);
490 nfs4_purge_state_owners(server);
494 * NFSv4.0 callback thread helper
496 * Find a client by callback identifier
499 nfs4_find_client_ident(struct net *net, int cb_ident)
501 struct nfs_client *clp;
502 struct nfs_net *nn = net_generic(net, nfs_net_id);
504 spin_lock(&nn->nfs_client_lock);
505 clp = idr_find(&nn->cb_ident_idr, cb_ident);
507 atomic_inc(&clp->cl_count);
508 spin_unlock(&nn->nfs_client_lock);
512 #if defined(CONFIG_NFS_V4_1)
513 /* Common match routine for v4.0 and v4.1 callback services */
514 static bool nfs4_cb_match_client(const struct sockaddr *addr,
515 struct nfs_client *clp, u32 minorversion)
517 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
519 /* Don't match clients that failed to initialise */
520 if (!(clp->cl_cons_state == NFS_CS_READY ||
521 clp->cl_cons_state == NFS_CS_SESSION_INITING))
526 /* Match the version and minorversion */
527 if (clp->rpc_ops->version != 4 ||
528 clp->cl_minorversion != minorversion)
531 /* Match only the IP address, not the port number */
532 if (!nfs_sockaddr_match_ipaddr(addr, clap))
539 * NFSv4.1 callback thread helper
540 * For CB_COMPOUND calls, find a client by IP address, protocol version,
541 * minorversion, and sessionID
543 * Returns NULL if no such client
546 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
547 struct nfs4_sessionid *sid)
549 struct nfs_client *clp;
550 struct nfs_net *nn = net_generic(net, nfs_net_id);
552 spin_lock(&nn->nfs_client_lock);
553 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
554 if (nfs4_cb_match_client(addr, clp, 1) == false)
557 if (!nfs4_has_session(clp))
561 if (memcmp(clp->cl_session->sess_id.data,
562 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
565 atomic_inc(&clp->cl_count);
566 spin_unlock(&nn->nfs_client_lock);
569 spin_unlock(&nn->nfs_client_lock);
573 #else /* CONFIG_NFS_V4_1 */
576 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
577 struct nfs4_sessionid *sid)
581 #endif /* CONFIG_NFS_V4_1 */
584 * Set up an NFS4 client
586 static int nfs4_set_client(struct nfs_server *server,
587 const char *hostname,
588 const struct sockaddr *addr,
589 const size_t addrlen,
591 rpc_authflavor_t authflavour,
592 int proto, const struct rpc_timeout *timeparms,
593 u32 minorversion, struct net *net)
595 struct nfs_client_initdata cl_init = {
596 .hostname = hostname,
601 .minorversion = minorversion,
604 struct nfs_client *clp;
607 dprintk("--> nfs4_set_client()\n");
609 if (server->flags & NFS_MOUNT_NORESVPORT)
610 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
612 /* Allocate or find a client reference we can use */
613 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
615 error = PTR_ERR(clp);
620 * Query for the lease time on clientid setup or renewal
622 * Note that this will be set on nfs_clients that were created
623 * only for the DS role and did not set this bit, but now will
626 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
628 server->nfs_client = clp;
629 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
632 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
637 * Set up a pNFS Data Server client.
639 * Return any existing nfs_client that matches server address,port,version
642 * For a new nfs_client, use a soft mount (default), a low retrans and a
643 * low timeout interval so that if a connection is lost, we retry through
646 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
647 const struct sockaddr *ds_addr, int ds_addrlen,
648 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
650 struct nfs_client_initdata cl_init = {
652 .addrlen = ds_addrlen,
655 .minorversion = mds_clp->cl_minorversion,
656 .net = mds_clp->cl_net,
658 struct rpc_timeout ds_timeout;
659 struct nfs_client *clp;
662 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
663 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
664 * (section 13.1 RFC 5661).
666 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
667 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
668 mds_clp->cl_rpcclient->cl_auth->au_flavor);
670 dprintk("<-- %s %p\n", __func__, clp);
673 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
676 * Session has been established, and the client marked ready.
677 * Set the mount rsize and wsize with negotiated fore channel
678 * attributes which will be bound checked in nfs_server_set_fsinfo.
680 static void nfs4_session_set_rwsize(struct nfs_server *server)
682 #ifdef CONFIG_NFS_V4_1
683 struct nfs4_session *sess;
687 if (!nfs4_has_session(server->nfs_client))
689 sess = server->nfs_client->cl_session;
690 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
691 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
693 if (server->rsize > server_resp_sz)
694 server->rsize = server_resp_sz;
695 if (server->wsize > server_rqst_sz)
696 server->wsize = server_rqst_sz;
697 #endif /* CONFIG_NFS_V4_1 */
700 static int nfs4_server_common_setup(struct nfs_server *server,
701 struct nfs_fh *mntfh)
703 struct nfs_fattr *fattr;
706 /* data servers support only a subset of NFSv4.1 */
707 if (is_ds_only_client(server->nfs_client))
708 return -EPROTONOSUPPORT;
710 fattr = nfs_alloc_fattr();
714 /* We must ensure the session is initialised first */
715 error = nfs4_init_session(server);
719 /* Probe the root fh to retrieve its FSID and filehandle */
720 error = nfs4_get_rootfh(server, mntfh);
724 dprintk("Server FSID: %llx:%llx\n",
725 (unsigned long long) server->fsid.major,
726 (unsigned long long) server->fsid.minor);
727 dprintk("Mount FH: %d\n", mntfh->size);
729 nfs4_session_set_rwsize(server);
731 error = nfs_probe_fsinfo(server, mntfh, fattr);
735 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
736 server->namelen = NFS4_MAXNAMLEN;
738 nfs_server_insert_lists(server);
739 server->mount_time = jiffies;
740 server->destroy = nfs4_destroy_server;
742 nfs_free_fattr(fattr);
747 * Create a version 4 volume record
749 static int nfs4_init_server(struct nfs_server *server,
750 const struct nfs_parsed_mount_data *data)
752 struct rpc_timeout timeparms;
755 dprintk("--> nfs4_init_server()\n");
757 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
758 data->timeo, data->retrans);
760 /* Initialise the client representation from the mount data */
761 server->flags = data->flags;
762 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
763 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
764 server->caps |= NFS_CAP_READDIRPLUS;
765 server->options = data->options;
767 /* Get a client record */
768 error = nfs4_set_client(server,
769 data->nfs_server.hostname,
770 (const struct sockaddr *)&data->nfs_server.address,
771 data->nfs_server.addrlen,
772 data->client_address,
773 data->auth_flavors[0],
774 data->nfs_server.protocol,
782 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
785 if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX)
786 server->caps |= NFS_CAP_UIDGID_NOMAP;
789 server->rsize = nfs_block_size(data->rsize, NULL);
791 server->wsize = nfs_block_size(data->wsize, NULL);
793 server->acregmin = data->acregmin * HZ;
794 server->acregmax = data->acregmax * HZ;
795 server->acdirmin = data->acdirmin * HZ;
796 server->acdirmax = data->acdirmax * HZ;
798 server->port = data->nfs_server.port;
800 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
804 dprintk("<-- nfs4_init_server() = %d\n", error);
809 * Create a version 4 volume record
810 * - keyed on server and FSID
812 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
813 struct nfs_fh *mntfh)*/
814 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
815 struct nfs_subversion *nfs_mod)
817 struct nfs_server *server;
820 dprintk("--> nfs4_create_server()\n");
822 server = nfs_alloc_server();
824 return ERR_PTR(-ENOMEM);
826 /* set up the general RPC client */
827 error = nfs4_init_server(server, mount_info->parsed);
831 error = nfs4_server_common_setup(server, mount_info->mntfh);
835 dprintk("<-- nfs4_create_server() = %p\n", server);
839 nfs_free_server(server);
840 dprintk("<-- nfs4_create_server() = error %d\n", error);
841 return ERR_PTR(error);
845 * Create an NFS4 referral server record
847 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
848 struct nfs_fh *mntfh)
850 struct nfs_client *parent_client;
851 struct nfs_server *server, *parent_server;
854 dprintk("--> nfs4_create_referral_server()\n");
856 server = nfs_alloc_server();
858 return ERR_PTR(-ENOMEM);
860 parent_server = NFS_SB(data->sb);
861 parent_client = parent_server->nfs_client;
863 /* Initialise the client representation from the parent server */
864 nfs_server_copy_userdata(server, parent_server);
865 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
867 /* Get a client representation.
868 * Note: NFSv4 always uses TCP, */
869 error = nfs4_set_client(server, data->hostname,
872 parent_client->cl_ipaddr,
874 rpc_protocol(parent_server->client),
875 parent_server->client->cl_timeout,
876 parent_client->cl_mvops->minor_version,
877 parent_client->cl_net);
881 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
885 error = nfs4_server_common_setup(server, mntfh);
889 dprintk("<-- nfs_create_referral_server() = %p\n", server);
893 nfs_free_server(server);
894 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
895 return ERR_PTR(error);