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 owners match
400 nfs4_match_serverowners(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->minor_id != o2->minor_id) {
406 dprintk("NFS: --> %s server owner minor IDs do not match\n",
411 if (o1->major_id_sz != o2->major_id_sz)
412 goto out_major_mismatch;
413 if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
414 goto out_major_mismatch;
416 dprintk("NFS: --> %s server owners match\n", __func__);
420 dprintk("NFS: --> %s server owner major IDs do not match\n",
426 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
428 * @new: nfs_client with client ID to test
429 * @result: OUT: found nfs_client, or new
430 * @cred: credential to use for trunking test
432 * Returns zero, a negative errno, or a negative NFS4ERR status.
433 * If zero is returned, an nfs_client pointer is planted in "result."
435 * NB: nfs41_walk_client_list() relies on the new nfs_client being
436 * the last nfs_client on the list.
438 int nfs41_walk_client_list(struct nfs_client *new,
439 struct nfs_client **result,
440 struct rpc_cred *cred)
442 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
443 struct nfs_client *pos, *prev = NULL;
444 int status = -NFS4ERR_STALE_CLIENTID;
446 spin_lock(&nn->nfs_client_lock);
447 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
449 if (pos->rpc_ops != new->rpc_ops)
452 if (pos->cl_proto != new->cl_proto)
455 if (pos->cl_minorversion != new->cl_minorversion)
458 /* If "pos" isn't marked ready, we can't trust the
459 * remaining fields in "pos", especially the client
460 * ID and serverowner fields. Wait for CREATE_SESSION
462 if (pos->cl_cons_state > NFS_CS_READY) {
463 atomic_inc(&pos->cl_count);
464 spin_unlock(&nn->nfs_client_lock);
467 nfs_put_client(prev);
470 status = nfs_wait_client_init_complete(pos);
472 nfs4_schedule_lease_recovery(pos);
473 status = nfs4_wait_clnt_recover(pos);
475 spin_lock(&nn->nfs_client_lock);
478 status = -NFS4ERR_STALE_CLIENTID;
480 if (pos->cl_cons_state != NFS_CS_READY)
483 if (!nfs4_match_clientids(pos, new))
486 if (!nfs4_match_serverowners(pos, new))
489 atomic_inc(&pos->cl_count);
492 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
493 __func__, pos, atomic_read(&pos->cl_count));
497 /* No matching nfs_client found. */
498 spin_unlock(&nn->nfs_client_lock);
499 dprintk("NFS: <-- %s status = %d\n", __func__, status);
501 nfs_put_client(prev);
504 #endif /* CONFIG_NFS_V4_1 */
506 static void nfs4_destroy_server(struct nfs_server *server)
508 nfs_server_return_all_delegations(server);
509 unset_pnfs_layoutdriver(server);
510 nfs4_purge_state_owners(server);
514 * NFSv4.0 callback thread helper
516 * Find a client by callback identifier
519 nfs4_find_client_ident(struct net *net, int cb_ident)
521 struct nfs_client *clp;
522 struct nfs_net *nn = net_generic(net, nfs_net_id);
524 spin_lock(&nn->nfs_client_lock);
525 clp = idr_find(&nn->cb_ident_idr, cb_ident);
527 atomic_inc(&clp->cl_count);
528 spin_unlock(&nn->nfs_client_lock);
532 #if defined(CONFIG_NFS_V4_1)
533 /* Common match routine for v4.0 and v4.1 callback services */
534 static bool nfs4_cb_match_client(const struct sockaddr *addr,
535 struct nfs_client *clp, u32 minorversion)
537 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
539 /* Don't match clients that failed to initialise */
540 if (!(clp->cl_cons_state == NFS_CS_READY ||
541 clp->cl_cons_state == NFS_CS_SESSION_INITING))
546 /* Match the version and minorversion */
547 if (clp->rpc_ops->version != 4 ||
548 clp->cl_minorversion != minorversion)
551 /* Match only the IP address, not the port number */
552 if (!nfs_sockaddr_match_ipaddr(addr, clap))
559 * NFSv4.1 callback thread helper
560 * For CB_COMPOUND calls, find a client by IP address, protocol version,
561 * minorversion, and sessionID
563 * Returns NULL if no such client
566 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
567 struct nfs4_sessionid *sid)
569 struct nfs_client *clp;
570 struct nfs_net *nn = net_generic(net, nfs_net_id);
572 spin_lock(&nn->nfs_client_lock);
573 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
574 if (nfs4_cb_match_client(addr, clp, 1) == false)
577 if (!nfs4_has_session(clp))
581 if (memcmp(clp->cl_session->sess_id.data,
582 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
585 atomic_inc(&clp->cl_count);
586 spin_unlock(&nn->nfs_client_lock);
589 spin_unlock(&nn->nfs_client_lock);
593 #else /* CONFIG_NFS_V4_1 */
596 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
597 struct nfs4_sessionid *sid)
601 #endif /* CONFIG_NFS_V4_1 */
604 * Set up an NFS4 client
606 static int nfs4_set_client(struct nfs_server *server,
607 const char *hostname,
608 const struct sockaddr *addr,
609 const size_t addrlen,
611 rpc_authflavor_t authflavour,
612 int proto, const struct rpc_timeout *timeparms,
613 u32 minorversion, struct net *net)
615 struct nfs_client_initdata cl_init = {
616 .hostname = hostname,
621 .minorversion = minorversion,
624 struct nfs_client *clp;
627 dprintk("--> nfs4_set_client()\n");
629 if (server->flags & NFS_MOUNT_NORESVPORT)
630 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
632 /* Allocate or find a client reference we can use */
633 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
635 error = PTR_ERR(clp);
640 * Query for the lease time on clientid setup or renewal
642 * Note that this will be set on nfs_clients that were created
643 * only for the DS role and did not set this bit, but now will
646 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
648 server->nfs_client = clp;
649 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
652 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
657 * Set up a pNFS Data Server client.
659 * Return any existing nfs_client that matches server address,port,version
662 * For a new nfs_client, use a soft mount (default), a low retrans and a
663 * low timeout interval so that if a connection is lost, we retry through
666 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
667 const struct sockaddr *ds_addr, int ds_addrlen,
668 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
670 struct nfs_client_initdata cl_init = {
672 .addrlen = ds_addrlen,
675 .minorversion = mds_clp->cl_minorversion,
676 .net = mds_clp->cl_net,
678 struct rpc_timeout ds_timeout;
679 struct nfs_client *clp;
682 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
683 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
684 * (section 13.1 RFC 5661).
686 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
687 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
688 mds_clp->cl_rpcclient->cl_auth->au_flavor);
690 dprintk("<-- %s %p\n", __func__, clp);
693 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
696 * Session has been established, and the client marked ready.
697 * Set the mount rsize and wsize with negotiated fore channel
698 * attributes which will be bound checked in nfs_server_set_fsinfo.
700 static void nfs4_session_set_rwsize(struct nfs_server *server)
702 #ifdef CONFIG_NFS_V4_1
703 struct nfs4_session *sess;
707 if (!nfs4_has_session(server->nfs_client))
709 sess = server->nfs_client->cl_session;
710 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
711 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
713 if (server->rsize > server_resp_sz)
714 server->rsize = server_resp_sz;
715 if (server->wsize > server_rqst_sz)
716 server->wsize = server_rqst_sz;
717 #endif /* CONFIG_NFS_V4_1 */
720 static int nfs4_server_common_setup(struct nfs_server *server,
721 struct nfs_fh *mntfh)
723 struct nfs_fattr *fattr;
726 /* data servers support only a subset of NFSv4.1 */
727 if (is_ds_only_client(server->nfs_client))
728 return -EPROTONOSUPPORT;
730 fattr = nfs_alloc_fattr();
734 /* We must ensure the session is initialised first */
735 error = nfs4_init_session(server);
739 /* Set the basic capabilities */
740 server->caps |= server->nfs_client->cl_mvops->init_caps;
741 if (server->flags & NFS_MOUNT_NORDIRPLUS)
742 server->caps &= ~NFS_CAP_READDIRPLUS;
744 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
747 if (nfs4_disable_idmapping &&
748 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
749 server->caps |= NFS_CAP_UIDGID_NOMAP;
752 /* Probe the root fh to retrieve its FSID and filehandle */
753 error = nfs4_get_rootfh(server, mntfh);
757 dprintk("Server FSID: %llx:%llx\n",
758 (unsigned long long) server->fsid.major,
759 (unsigned long long) server->fsid.minor);
760 dprintk("Mount FH: %d\n", mntfh->size);
762 nfs4_session_set_rwsize(server);
764 error = nfs_probe_fsinfo(server, mntfh, fattr);
768 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
769 server->namelen = NFS4_MAXNAMLEN;
771 nfs_server_insert_lists(server);
772 server->mount_time = jiffies;
773 server->destroy = nfs4_destroy_server;
775 nfs_free_fattr(fattr);
780 * Create a version 4 volume record
782 static int nfs4_init_server(struct nfs_server *server,
783 const struct nfs_parsed_mount_data *data)
785 struct rpc_timeout timeparms;
788 dprintk("--> nfs4_init_server()\n");
790 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
791 data->timeo, data->retrans);
793 /* Initialise the client representation from the mount data */
794 server->flags = data->flags;
795 server->options = data->options;
797 /* Get a client record */
798 error = nfs4_set_client(server,
799 data->nfs_server.hostname,
800 (const struct sockaddr *)&data->nfs_server.address,
801 data->nfs_server.addrlen,
802 data->client_address,
803 data->auth_flavors[0],
804 data->nfs_server.protocol,
812 server->rsize = nfs_block_size(data->rsize, NULL);
814 server->wsize = nfs_block_size(data->wsize, NULL);
816 server->acregmin = data->acregmin * HZ;
817 server->acregmax = data->acregmax * HZ;
818 server->acdirmin = data->acdirmin * HZ;
819 server->acdirmax = data->acdirmax * HZ;
821 server->port = data->nfs_server.port;
823 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
827 dprintk("<-- nfs4_init_server() = %d\n", error);
832 * Create a version 4 volume record
833 * - keyed on server and FSID
835 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
836 struct nfs_fh *mntfh)*/
837 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
838 struct nfs_subversion *nfs_mod)
840 struct nfs_server *server;
843 dprintk("--> nfs4_create_server()\n");
845 server = nfs_alloc_server();
847 return ERR_PTR(-ENOMEM);
849 /* set up the general RPC client */
850 error = nfs4_init_server(server, mount_info->parsed);
854 error = nfs4_server_common_setup(server, mount_info->mntfh);
858 dprintk("<-- nfs4_create_server() = %p\n", server);
862 nfs_free_server(server);
863 dprintk("<-- nfs4_create_server() = error %d\n", error);
864 return ERR_PTR(error);
868 * Create an NFS4 referral server record
870 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
871 struct nfs_fh *mntfh)
873 struct nfs_client *parent_client;
874 struct nfs_server *server, *parent_server;
877 dprintk("--> nfs4_create_referral_server()\n");
879 server = nfs_alloc_server();
881 return ERR_PTR(-ENOMEM);
883 parent_server = NFS_SB(data->sb);
884 parent_client = parent_server->nfs_client;
886 /* Initialise the client representation from the parent server */
887 nfs_server_copy_userdata(server, parent_server);
889 /* Get a client representation.
890 * Note: NFSv4 always uses TCP, */
891 error = nfs4_set_client(server, data->hostname,
894 parent_client->cl_ipaddr,
896 rpc_protocol(parent_server->client),
897 parent_server->client->cl_timeout,
898 parent_client->cl_mvops->minor_version,
899 parent_client->cl_net);
903 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
907 error = nfs4_server_common_setup(server, mntfh);
911 dprintk("<-- nfs_create_referral_server() = %p\n", server);
915 nfs_free_server(server);
916 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
917 return ERR_PTR(error);