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/addr.h>
10 #include <linux/sunrpc/auth.h>
11 #include <linux/sunrpc/xprt.h>
12 #include <linux/sunrpc/bc_xprt.h>
15 #include "delegation.h"
16 #include "nfs4session.h"
20 #define NFSDBG_FACILITY NFSDBG_CLIENT
23 * Get a unique NFSv4.0 callback identifier which will be used
24 * by the V4.0 callback service to lookup the nfs_client struct
26 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
29 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
31 if (clp->rpc_ops->version != 4 || minorversion != 0)
33 idr_preload(GFP_KERNEL);
34 spin_lock(&nn->nfs_client_lock);
35 ret = idr_alloc(&nn->cb_ident_idr, clp, 0, 0, GFP_NOWAIT);
37 clp->cl_cb_ident = ret;
38 spin_unlock(&nn->nfs_client_lock);
40 return ret < 0 ? ret : 0;
43 #ifdef CONFIG_NFS_V4_1
44 static void nfs4_shutdown_session(struct nfs_client *clp)
46 if (nfs4_has_session(clp)) {
47 nfs4_destroy_session(clp->cl_session);
48 nfs4_destroy_clientid(clp);
52 #else /* CONFIG_NFS_V4_1 */
53 static void nfs4_shutdown_session(struct nfs_client *clp)
56 #endif /* CONFIG_NFS_V4_1 */
58 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
61 struct nfs_client *clp = nfs_alloc_client(cl_init);
65 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
69 spin_lock_init(&clp->cl_lock);
70 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
71 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
72 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
73 clp->cl_minorversion = cl_init->minorversion;
74 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
83 * Destroy the NFS4 callback service
85 static void nfs4_destroy_callback(struct nfs_client *clp)
87 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
88 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
91 static void nfs4_shutdown_client(struct nfs_client *clp)
93 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
94 nfs4_kill_renewd(clp);
95 nfs4_shutdown_session(clp);
96 nfs4_destroy_callback(clp);
97 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
98 nfs_idmap_delete(clp);
100 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
101 kfree(clp->cl_serverowner);
102 kfree(clp->cl_serverscope);
103 kfree(clp->cl_implid);
106 void nfs4_free_client(struct nfs_client *clp)
108 nfs4_shutdown_client(clp);
109 nfs_free_client(clp);
113 * Initialize the NFS4 callback service
115 static int nfs4_init_callback(struct nfs_client *clp)
119 if (clp->rpc_ops->version == 4) {
120 struct rpc_xprt *xprt;
122 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
124 if (nfs4_has_session(clp)) {
125 error = xprt_setup_backchannel(xprt,
126 NFS41_BC_MIN_CALLBACKS);
131 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
133 dprintk("%s: failed to start callback. Error = %d\n",
137 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
143 * Initialize the minor version specific parts of an NFS4 client record
145 static int nfs4_init_client_minor_version(struct nfs_client *clp)
147 #if defined(CONFIG_NFS_V4_1)
148 if (clp->cl_mvops->minor_version) {
149 struct nfs4_session *session = NULL;
151 * Create the session and mark it expired.
152 * When a SEQUENCE operation encounters the expired session
153 * it will do session recovery to initialize it.
155 session = nfs4_alloc_session(clp);
159 clp->cl_session = session;
161 * The create session reply races with the server back
162 * channel probe. Mark the client NFS_CS_SESSION_INITING
163 * so that the client back channel can find the
166 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
168 #endif /* CONFIG_NFS_V4_1 */
170 return nfs4_init_callback(clp);
174 * nfs4_init_client - Initialise an NFS4 client record
176 * @clp: nfs_client to initialise
177 * @timeparms: timeout parameters for underlying RPC transport
178 * @ip_addr: callback IP address in presentation format
179 * @authflavor: authentication flavor for underlying RPC transport
181 * Returns pointer to an NFS client, or an ERR_PTR value.
183 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
184 const struct rpc_timeout *timeparms,
186 rpc_authflavor_t authflavour)
188 char buf[INET6_ADDRSTRLEN + 1];
189 struct nfs_client *old;
192 if (clp->cl_cons_state == NFS_CS_READY) {
193 /* the client is initialised already */
194 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
198 /* Check NFS protocol revision and initialize RPC op vector */
199 clp->rpc_ops = &nfs_v4_clientops;
201 if (clp->cl_minorversion != 0)
202 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
203 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
204 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_GSS_KRB5I);
205 if (error == -EINVAL)
206 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
210 /* If no clientaddr= option was specified, find a usable cb address */
211 if (ip_addr == NULL) {
212 struct sockaddr_storage cb_addr;
213 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
215 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
218 error = rpc_ntop(sap, buf, sizeof(buf));
221 ip_addr = (const char *)buf;
223 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
225 error = nfs_idmap_new(clp);
227 dprintk("%s: failed to create idmapper. Error = %d\n",
231 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
233 error = nfs4_init_client_minor_version(clp);
237 if (!nfs4_has_session(clp))
238 nfs_mark_client_ready(clp, NFS_CS_READY);
240 error = nfs4_discover_server_trunking(clp, &old);
245 clp->cl_preserve_clid = true;
250 nfs_mark_client_ready(clp, error);
252 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
253 return ERR_PTR(error);
257 * SETCLIENTID just did a callback update with the callback ident in
258 * "drop," but server trunking discovery claims "drop" and "keep" are
259 * actually the same server. Swap the callback IDs so that "keep"
260 * will continue to use the callback ident the server now knows about,
261 * and so that "keep"'s original callback ident is destroyed when
264 static void nfs4_swap_callback_idents(struct nfs_client *keep,
265 struct nfs_client *drop)
267 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
268 unsigned int save = keep->cl_cb_ident;
270 if (keep->cl_cb_ident == drop->cl_cb_ident)
273 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
274 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
276 spin_lock(&nn->nfs_client_lock);
278 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
279 keep->cl_cb_ident = drop->cl_cb_ident;
281 idr_replace(&nn->cb_ident_idr, drop, save);
282 drop->cl_cb_ident = save;
284 spin_unlock(&nn->nfs_client_lock);
288 * nfs40_walk_client_list - Find server that recognizes a client ID
290 * @new: nfs_client with client ID to test
291 * @result: OUT: found nfs_client, or new
292 * @cred: credential to use for trunking test
294 * Returns zero, a negative errno, or a negative NFS4ERR status.
295 * If zero is returned, an nfs_client pointer is planted in "result."
297 * NB: nfs40_walk_client_list() relies on the new nfs_client being
298 * the last nfs_client on the list.
300 int nfs40_walk_client_list(struct nfs_client *new,
301 struct nfs_client **result,
302 struct rpc_cred *cred)
304 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
305 struct nfs_client *pos, *prev = NULL;
306 struct nfs4_setclientid_res clid = {
307 .clientid = new->cl_clientid,
308 .confirm = new->cl_confirm,
310 int status = -NFS4ERR_STALE_CLIENTID;
312 spin_lock(&nn->nfs_client_lock);
313 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
315 if (pos->rpc_ops != new->rpc_ops)
318 if (pos->cl_proto != new->cl_proto)
321 if (pos->cl_minorversion != new->cl_minorversion)
324 /* If "pos" isn't marked ready, we can't trust the
325 * remaining fields in "pos" */
326 if (pos->cl_cons_state > NFS_CS_READY) {
327 atomic_inc(&pos->cl_count);
328 spin_unlock(&nn->nfs_client_lock);
331 nfs_put_client(prev);
334 status = nfs_wait_client_init_complete(pos);
337 status = -NFS4ERR_STALE_CLIENTID;
338 spin_lock(&nn->nfs_client_lock);
340 if (pos->cl_cons_state != NFS_CS_READY)
343 if (pos->cl_clientid != new->cl_clientid)
346 atomic_inc(&pos->cl_count);
347 spin_unlock(&nn->nfs_client_lock);
350 nfs_put_client(prev);
353 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
355 case -NFS4ERR_STALE_CLIENTID:
358 nfs4_swap_callback_idents(pos, new);
362 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
363 __func__, pos, atomic_read(&pos->cl_count));
368 spin_lock(&nn->nfs_client_lock);
370 spin_unlock(&nn->nfs_client_lock);
372 /* No match found. The server lost our clientid */
375 nfs_put_client(prev);
376 dprintk("NFS: <-- %s status = %d\n", __func__, status);
380 #ifdef CONFIG_NFS_V4_1
382 * Returns true if the client IDs match
384 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
386 if (a->cl_clientid != b->cl_clientid) {
387 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
388 __func__, a->cl_clientid, b->cl_clientid);
391 dprintk("NFS: --> %s client ID %llx matches %llx\n",
392 __func__, a->cl_clientid, b->cl_clientid);
397 * Returns true if the server major ids match
400 nfs4_check_clientid_trunking(struct nfs_client *a, struct nfs_client *b)
402 struct nfs41_server_owner *o1 = a->cl_serverowner;
403 struct nfs41_server_owner *o2 = b->cl_serverowner;
405 if (o1->major_id_sz != o2->major_id_sz)
406 goto out_major_mismatch;
407 if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
408 goto out_major_mismatch;
410 dprintk("NFS: --> %s server owners match\n", __func__);
414 dprintk("NFS: --> %s server owner major IDs do not match\n",
420 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
422 * @new: nfs_client with client ID to test
423 * @result: OUT: found nfs_client, or new
424 * @cred: credential to use for trunking test
426 * Returns zero, a negative errno, or a negative NFS4ERR status.
427 * If zero is returned, an nfs_client pointer is planted in "result."
429 * NB: nfs41_walk_client_list() relies on the new nfs_client being
430 * the last nfs_client on the list.
432 int nfs41_walk_client_list(struct nfs_client *new,
433 struct nfs_client **result,
434 struct rpc_cred *cred)
436 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
437 struct nfs_client *pos, *prev = NULL;
438 int status = -NFS4ERR_STALE_CLIENTID;
440 spin_lock(&nn->nfs_client_lock);
441 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
443 if (pos->rpc_ops != new->rpc_ops)
446 if (pos->cl_proto != new->cl_proto)
449 if (pos->cl_minorversion != new->cl_minorversion)
452 /* If "pos" isn't marked ready, we can't trust the
453 * remaining fields in "pos", especially the client
454 * ID and serverowner fields. Wait for CREATE_SESSION
456 if (pos->cl_cons_state > NFS_CS_READY) {
457 atomic_inc(&pos->cl_count);
458 spin_unlock(&nn->nfs_client_lock);
461 nfs_put_client(prev);
464 status = nfs_wait_client_init_complete(pos);
465 if (pos->cl_cons_state == NFS_CS_SESSION_INITING) {
466 nfs4_schedule_lease_recovery(pos);
467 status = nfs4_wait_clnt_recover(pos);
469 spin_lock(&nn->nfs_client_lock);
472 status = -NFS4ERR_STALE_CLIENTID;
474 if (pos->cl_cons_state != NFS_CS_READY)
477 if (!nfs4_match_clientids(pos, new))
481 * Note that session trunking is just a special subcase of
482 * client id trunking. In either case, we want to fall back
483 * to using the existing nfs_client.
485 if (!nfs4_check_clientid_trunking(pos, new))
488 atomic_inc(&pos->cl_count);
491 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
492 __func__, pos, atomic_read(&pos->cl_count));
496 /* No matching nfs_client found. */
497 spin_unlock(&nn->nfs_client_lock);
498 dprintk("NFS: <-- %s status = %d\n", __func__, status);
500 nfs_put_client(prev);
503 #endif /* CONFIG_NFS_V4_1 */
505 static void nfs4_destroy_server(struct nfs_server *server)
507 nfs_server_return_all_delegations(server);
508 unset_pnfs_layoutdriver(server);
509 nfs4_purge_state_owners(server);
513 * NFSv4.0 callback thread helper
515 * Find a client by callback identifier
518 nfs4_find_client_ident(struct net *net, int cb_ident)
520 struct nfs_client *clp;
521 struct nfs_net *nn = net_generic(net, nfs_net_id);
523 spin_lock(&nn->nfs_client_lock);
524 clp = idr_find(&nn->cb_ident_idr, cb_ident);
526 atomic_inc(&clp->cl_count);
527 spin_unlock(&nn->nfs_client_lock);
531 #if defined(CONFIG_NFS_V4_1)
532 /* Common match routine for v4.0 and v4.1 callback services */
533 static bool nfs4_cb_match_client(const struct sockaddr *addr,
534 struct nfs_client *clp, u32 minorversion)
536 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
538 /* Don't match clients that failed to initialise */
539 if (!(clp->cl_cons_state == NFS_CS_READY ||
540 clp->cl_cons_state == NFS_CS_SESSION_INITING))
545 /* Match the version and minorversion */
546 if (clp->rpc_ops->version != 4 ||
547 clp->cl_minorversion != minorversion)
550 /* Match only the IP address, not the port number */
551 if (!nfs_sockaddr_match_ipaddr(addr, clap))
558 * NFSv4.1 callback thread helper
559 * For CB_COMPOUND calls, find a client by IP address, protocol version,
560 * minorversion, and sessionID
562 * Returns NULL if no such client
565 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
566 struct nfs4_sessionid *sid)
568 struct nfs_client *clp;
569 struct nfs_net *nn = net_generic(net, nfs_net_id);
571 spin_lock(&nn->nfs_client_lock);
572 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
573 if (nfs4_cb_match_client(addr, clp, 1) == false)
576 if (!nfs4_has_session(clp))
580 if (memcmp(clp->cl_session->sess_id.data,
581 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
584 atomic_inc(&clp->cl_count);
585 spin_unlock(&nn->nfs_client_lock);
588 spin_unlock(&nn->nfs_client_lock);
592 #else /* CONFIG_NFS_V4_1 */
595 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
596 struct nfs4_sessionid *sid)
600 #endif /* CONFIG_NFS_V4_1 */
603 * Set up an NFS4 client
605 static int nfs4_set_client(struct nfs_server *server,
606 const char *hostname,
607 const struct sockaddr *addr,
608 const size_t addrlen,
610 rpc_authflavor_t authflavour,
611 int proto, const struct rpc_timeout *timeparms,
612 u32 minorversion, struct net *net)
614 struct nfs_client_initdata cl_init = {
615 .hostname = hostname,
620 .minorversion = minorversion,
623 struct nfs_client *clp;
626 dprintk("--> nfs4_set_client()\n");
628 if (server->flags & NFS_MOUNT_NORESVPORT)
629 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
631 /* Allocate or find a client reference we can use */
632 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
634 error = PTR_ERR(clp);
639 * Query for the lease time on clientid setup or renewal
641 * Note that this will be set on nfs_clients that were created
642 * only for the DS role and did not set this bit, but now will
645 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
647 server->nfs_client = clp;
648 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
651 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
656 * Set up a pNFS Data Server client.
658 * Return any existing nfs_client that matches server address,port,version
661 * For a new nfs_client, use a soft mount (default), a low retrans and a
662 * low timeout interval so that if a connection is lost, we retry through
665 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
666 const struct sockaddr *ds_addr, int ds_addrlen,
667 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
669 struct nfs_client_initdata cl_init = {
671 .addrlen = ds_addrlen,
674 .minorversion = mds_clp->cl_minorversion,
675 .net = mds_clp->cl_net,
677 struct rpc_timeout ds_timeout;
678 struct nfs_client *clp;
681 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
682 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
683 * (section 13.1 RFC 5661).
685 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
686 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
687 mds_clp->cl_rpcclient->cl_auth->au_flavor);
689 dprintk("<-- %s %p\n", __func__, clp);
692 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
695 * Session has been established, and the client marked ready.
696 * Set the mount rsize and wsize with negotiated fore channel
697 * attributes which will be bound checked in nfs_server_set_fsinfo.
699 static void nfs4_session_set_rwsize(struct nfs_server *server)
701 #ifdef CONFIG_NFS_V4_1
702 struct nfs4_session *sess;
706 if (!nfs4_has_session(server->nfs_client))
708 sess = server->nfs_client->cl_session;
709 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
710 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
712 if (server->rsize > server_resp_sz)
713 server->rsize = server_resp_sz;
714 if (server->wsize > server_rqst_sz)
715 server->wsize = server_rqst_sz;
716 #endif /* CONFIG_NFS_V4_1 */
719 static int nfs4_server_common_setup(struct nfs_server *server,
720 struct nfs_fh *mntfh)
722 struct nfs_fattr *fattr;
725 /* data servers support only a subset of NFSv4.1 */
726 if (is_ds_only_client(server->nfs_client))
727 return -EPROTONOSUPPORT;
729 fattr = nfs_alloc_fattr();
733 /* We must ensure the session is initialised first */
734 error = nfs4_init_session(server);
738 /* Set the basic capabilities */
739 server->caps |= server->nfs_client->cl_mvops->init_caps;
740 if (server->flags & NFS_MOUNT_NORDIRPLUS)
741 server->caps &= ~NFS_CAP_READDIRPLUS;
743 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
746 if (nfs4_disable_idmapping &&
747 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
748 server->caps |= NFS_CAP_UIDGID_NOMAP;
751 /* Probe the root fh to retrieve its FSID and filehandle */
752 error = nfs4_get_rootfh(server, mntfh);
756 dprintk("Server FSID: %llx:%llx\n",
757 (unsigned long long) server->fsid.major,
758 (unsigned long long) server->fsid.minor);
759 dprintk("Mount FH: %d\n", mntfh->size);
761 nfs4_session_set_rwsize(server);
763 error = nfs_probe_fsinfo(server, mntfh, fattr);
767 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
768 server->namelen = NFS4_MAXNAMLEN;
770 nfs_server_insert_lists(server);
771 server->mount_time = jiffies;
772 server->destroy = nfs4_destroy_server;
774 nfs_free_fattr(fattr);
779 * Create a version 4 volume record
781 static int nfs4_init_server(struct nfs_server *server,
782 const struct nfs_parsed_mount_data *data)
784 struct rpc_timeout timeparms;
787 dprintk("--> nfs4_init_server()\n");
789 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
790 data->timeo, data->retrans);
792 /* Initialise the client representation from the mount data */
793 server->flags = data->flags;
794 server->options = data->options;
796 /* Get a client record */
797 error = nfs4_set_client(server,
798 data->nfs_server.hostname,
799 (const struct sockaddr *)&data->nfs_server.address,
800 data->nfs_server.addrlen,
801 data->client_address,
802 data->auth_flavors[0],
803 data->nfs_server.protocol,
811 server->rsize = nfs_block_size(data->rsize, NULL);
813 server->wsize = nfs_block_size(data->wsize, NULL);
815 server->acregmin = data->acregmin * HZ;
816 server->acregmax = data->acregmax * HZ;
817 server->acdirmin = data->acdirmin * HZ;
818 server->acdirmax = data->acdirmax * HZ;
820 server->port = data->nfs_server.port;
822 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
826 dprintk("<-- nfs4_init_server() = %d\n", error);
831 * Create a version 4 volume record
832 * - keyed on server and FSID
834 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
835 struct nfs_fh *mntfh)*/
836 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
837 struct nfs_subversion *nfs_mod)
839 struct nfs_server *server;
842 dprintk("--> nfs4_create_server()\n");
844 server = nfs_alloc_server();
846 return ERR_PTR(-ENOMEM);
848 /* set up the general RPC client */
849 error = nfs4_init_server(server, mount_info->parsed);
853 error = nfs4_server_common_setup(server, mount_info->mntfh);
857 dprintk("<-- nfs4_create_server() = %p\n", server);
861 nfs_free_server(server);
862 dprintk("<-- nfs4_create_server() = error %d\n", error);
863 return ERR_PTR(error);
867 * Create an NFS4 referral server record
869 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
870 struct nfs_fh *mntfh)
872 struct nfs_client *parent_client;
873 struct nfs_server *server, *parent_server;
876 dprintk("--> nfs4_create_referral_server()\n");
878 server = nfs_alloc_server();
880 return ERR_PTR(-ENOMEM);
882 parent_server = NFS_SB(data->sb);
883 parent_client = parent_server->nfs_client;
885 /* Initialise the client representation from the parent server */
886 nfs_server_copy_userdata(server, parent_server);
888 /* Get a client representation.
889 * Note: NFSv4 always uses TCP, */
890 error = nfs4_set_client(server, data->hostname,
893 parent_client->cl_ipaddr,
895 rpc_protocol(parent_server->client),
896 parent_server->client->cl_timeout,
897 parent_client->cl_mvops->minor_version,
898 parent_client->cl_net);
902 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
906 error = nfs4_server_common_setup(server, mntfh);
910 dprintk("<-- nfs_create_referral_server() = %p\n", server);
914 nfs_free_server(server);
915 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
916 return ERR_PTR(error);