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"
18 #define NFSDBG_FACILITY NFSDBG_CLIENT
21 * Get a unique NFSv4.0 callback identifier which will be used
22 * by the V4.0 callback service to lookup the nfs_client struct
24 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
27 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
29 if (clp->rpc_ops->version != 4 || minorversion != 0)
32 if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL))
34 spin_lock(&nn->nfs_client_lock);
35 ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident);
36 spin_unlock(&nn->nfs_client_lock);
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);
239 clp->cl_preserve_clid = true;
242 atomic_inc(&clp->cl_count);
248 nfs_mark_client_ready(clp, error);
250 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
251 return ERR_PTR(error);
255 * Returns true if the client IDs match
257 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
259 if (a->cl_clientid != b->cl_clientid) {
260 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
261 __func__, a->cl_clientid, b->cl_clientid);
264 dprintk("NFS: --> %s client ID %llx matches %llx\n",
265 __func__, a->cl_clientid, b->cl_clientid);
270 * SETCLIENTID just did a callback update with the callback ident in
271 * "drop," but server trunking discovery claims "drop" and "keep" are
272 * actually the same server. Swap the callback IDs so that "keep"
273 * will continue to use the callback ident the server now knows about,
274 * and so that "keep"'s original callback ident is destroyed when
277 static void nfs4_swap_callback_idents(struct nfs_client *keep,
278 struct nfs_client *drop)
280 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
281 unsigned int save = keep->cl_cb_ident;
283 if (keep->cl_cb_ident == drop->cl_cb_ident)
286 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
287 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
289 spin_lock(&nn->nfs_client_lock);
291 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
292 keep->cl_cb_ident = drop->cl_cb_ident;
294 idr_replace(&nn->cb_ident_idr, drop, save);
295 drop->cl_cb_ident = save;
297 spin_unlock(&nn->nfs_client_lock);
301 * nfs40_walk_client_list - Find server that recognizes a client ID
303 * @new: nfs_client with client ID to test
304 * @result: OUT: found nfs_client, or new
305 * @cred: credential to use for trunking test
307 * Returns zero, a negative errno, or a negative NFS4ERR status.
308 * If zero is returned, an nfs_client pointer is planted in "result."
310 * NB: nfs40_walk_client_list() relies on the new nfs_client being
311 * the last nfs_client on the list.
313 int nfs40_walk_client_list(struct nfs_client *new,
314 struct nfs_client **result,
315 struct rpc_cred *cred)
317 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
318 struct nfs_client *pos, *n, *prev = NULL;
319 struct nfs4_setclientid_res clid = {
320 .clientid = new->cl_clientid,
321 .confirm = new->cl_confirm,
325 spin_lock(&nn->nfs_client_lock);
326 list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
327 /* If "pos" isn't marked ready, we can't trust the
328 * remaining fields in "pos" */
329 if (pos->cl_cons_state < NFS_CS_READY)
332 if (pos->rpc_ops != new->rpc_ops)
335 if (pos->cl_proto != new->cl_proto)
338 if (pos->cl_minorversion != new->cl_minorversion)
341 if (pos->cl_clientid != new->cl_clientid)
344 atomic_inc(&pos->cl_count);
345 spin_unlock(&nn->nfs_client_lock);
348 nfs_put_client(prev);
350 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
352 nfs4_swap_callback_idents(pos, new);
356 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
357 __func__, pos, atomic_read(&pos->cl_count));
360 if (status != -NFS4ERR_STALE_CLIENTID) {
362 dprintk("NFS: <-- %s status = %d, no result\n",
367 spin_lock(&nn->nfs_client_lock);
372 * No matching nfs_client found. This should be impossible,
373 * because the new nfs_client has already been added to
374 * nfs_client_list by nfs_get_client().
376 * Don't BUG(), since the caller is holding a mutex.
379 nfs_put_client(prev);
380 spin_unlock(&nn->nfs_client_lock);
381 pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
382 return -NFS4ERR_STALE_CLIENTID;
385 #ifdef CONFIG_NFS_V4_1
387 * Returns true if the server owners match
390 nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
392 struct nfs41_server_owner *o1 = a->cl_serverowner;
393 struct nfs41_server_owner *o2 = b->cl_serverowner;
395 if (o1->minor_id != o2->minor_id) {
396 dprintk("NFS: --> %s server owner minor IDs do not match\n",
401 if (o1->major_id_sz != o2->major_id_sz)
402 goto out_major_mismatch;
403 if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
404 goto out_major_mismatch;
406 dprintk("NFS: --> %s server owners match\n", __func__);
410 dprintk("NFS: --> %s server owner major IDs do not match\n",
416 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
418 * @new: nfs_client with client ID to test
419 * @result: OUT: found nfs_client, or new
420 * @cred: credential to use for trunking test
422 * Returns zero, a negative errno, or a negative NFS4ERR status.
423 * If zero is returned, an nfs_client pointer is planted in "result."
425 * NB: nfs41_walk_client_list() relies on the new nfs_client being
426 * the last nfs_client on the list.
428 int nfs41_walk_client_list(struct nfs_client *new,
429 struct nfs_client **result,
430 struct rpc_cred *cred)
432 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
433 struct nfs_client *pos, *n, *prev = NULL;
436 spin_lock(&nn->nfs_client_lock);
437 list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
438 /* If "pos" isn't marked ready, we can't trust the
439 * remaining fields in "pos", especially the client
440 * ID and serverowner fields. Wait for CREATE_SESSION
442 if (pos->cl_cons_state < NFS_CS_READY) {
443 atomic_inc(&pos->cl_count);
444 spin_unlock(&nn->nfs_client_lock);
447 nfs_put_client(prev);
450 error = nfs_wait_client_init_complete(pos);
456 spin_lock(&nn->nfs_client_lock);
459 if (pos->rpc_ops != new->rpc_ops)
462 if (pos->cl_proto != new->cl_proto)
465 if (pos->cl_minorversion != new->cl_minorversion)
468 if (!nfs4_match_clientids(pos, new))
471 if (!nfs4_match_serverowners(pos, new))
474 spin_unlock(&nn->nfs_client_lock);
475 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
476 __func__, pos, atomic_read(&pos->cl_count));
483 * No matching nfs_client found. This should be impossible,
484 * because the new nfs_client has already been added to
485 * nfs_client_list by nfs_get_client().
487 * Don't BUG(), since the caller is holding a mutex.
489 spin_unlock(&nn->nfs_client_lock);
490 pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
491 return -NFS4ERR_STALE_CLIENTID;
493 #endif /* CONFIG_NFS_V4_1 */
495 static void nfs4_destroy_server(struct nfs_server *server)
497 nfs_server_return_all_delegations(server);
498 unset_pnfs_layoutdriver(server);
499 nfs4_purge_state_owners(server);
503 * NFSv4.0 callback thread helper
505 * Find a client by callback identifier
508 nfs4_find_client_ident(struct net *net, int cb_ident)
510 struct nfs_client *clp;
511 struct nfs_net *nn = net_generic(net, nfs_net_id);
513 spin_lock(&nn->nfs_client_lock);
514 clp = idr_find(&nn->cb_ident_idr, cb_ident);
516 atomic_inc(&clp->cl_count);
517 spin_unlock(&nn->nfs_client_lock);
521 #if defined(CONFIG_NFS_V4_1)
522 /* Common match routine for v4.0 and v4.1 callback services */
523 static bool nfs4_cb_match_client(const struct sockaddr *addr,
524 struct nfs_client *clp, u32 minorversion)
526 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
528 /* Don't match clients that failed to initialise */
529 if (!(clp->cl_cons_state == NFS_CS_READY ||
530 clp->cl_cons_state == NFS_CS_SESSION_INITING))
535 /* Match the version and minorversion */
536 if (clp->rpc_ops->version != 4 ||
537 clp->cl_minorversion != minorversion)
540 /* Match only the IP address, not the port number */
541 if (!nfs_sockaddr_match_ipaddr(addr, clap))
548 * NFSv4.1 callback thread helper
549 * For CB_COMPOUND calls, find a client by IP address, protocol version,
550 * minorversion, and sessionID
552 * Returns NULL if no such client
555 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
556 struct nfs4_sessionid *sid)
558 struct nfs_client *clp;
559 struct nfs_net *nn = net_generic(net, nfs_net_id);
561 spin_lock(&nn->nfs_client_lock);
562 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
563 if (nfs4_cb_match_client(addr, clp, 1) == false)
566 if (!nfs4_has_session(clp))
570 if (memcmp(clp->cl_session->sess_id.data,
571 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
574 atomic_inc(&clp->cl_count);
575 spin_unlock(&nn->nfs_client_lock);
578 spin_unlock(&nn->nfs_client_lock);
582 #else /* CONFIG_NFS_V4_1 */
585 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
586 struct nfs4_sessionid *sid)
590 #endif /* CONFIG_NFS_V4_1 */
593 * Set up an NFS4 client
595 static int nfs4_set_client(struct nfs_server *server,
596 const char *hostname,
597 const struct sockaddr *addr,
598 const size_t addrlen,
600 rpc_authflavor_t authflavour,
601 int proto, const struct rpc_timeout *timeparms,
602 u32 minorversion, struct net *net)
604 struct nfs_client_initdata cl_init = {
605 .hostname = hostname,
610 .minorversion = minorversion,
613 struct nfs_client *clp;
616 dprintk("--> nfs4_set_client()\n");
618 if (server->flags & NFS_MOUNT_NORESVPORT)
619 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
621 /* Allocate or find a client reference we can use */
622 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
624 error = PTR_ERR(clp);
629 * Query for the lease time on clientid setup or renewal
631 * Note that this will be set on nfs_clients that were created
632 * only for the DS role and did not set this bit, but now will
635 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
637 server->nfs_client = clp;
638 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
641 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
646 * Set up a pNFS Data Server client.
648 * Return any existing nfs_client that matches server address,port,version
651 * For a new nfs_client, use a soft mount (default), a low retrans and a
652 * low timeout interval so that if a connection is lost, we retry through
655 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
656 const struct sockaddr *ds_addr, int ds_addrlen,
657 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
659 struct nfs_client_initdata cl_init = {
661 .addrlen = ds_addrlen,
664 .minorversion = mds_clp->cl_minorversion,
665 .net = mds_clp->cl_net,
667 struct rpc_timeout ds_timeout;
668 struct nfs_client *clp;
671 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
672 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
673 * (section 13.1 RFC 5661).
675 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
676 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
677 mds_clp->cl_rpcclient->cl_auth->au_flavor);
679 dprintk("<-- %s %p\n", __func__, clp);
682 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
685 * Session has been established, and the client marked ready.
686 * Set the mount rsize and wsize with negotiated fore channel
687 * attributes which will be bound checked in nfs_server_set_fsinfo.
689 static void nfs4_session_set_rwsize(struct nfs_server *server)
691 #ifdef CONFIG_NFS_V4_1
692 struct nfs4_session *sess;
696 if (!nfs4_has_session(server->nfs_client))
698 sess = server->nfs_client->cl_session;
699 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
700 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
702 if (server->rsize > server_resp_sz)
703 server->rsize = server_resp_sz;
704 if (server->wsize > server_rqst_sz)
705 server->wsize = server_rqst_sz;
706 #endif /* CONFIG_NFS_V4_1 */
709 static int nfs4_server_common_setup(struct nfs_server *server,
710 struct nfs_fh *mntfh)
712 struct nfs_fattr *fattr;
715 BUG_ON(!server->nfs_client);
716 BUG_ON(!server->nfs_client->rpc_ops);
717 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
719 /* data servers support only a subset of NFSv4.1 */
720 if (is_ds_only_client(server->nfs_client))
721 return -EPROTONOSUPPORT;
723 fattr = nfs_alloc_fattr();
727 /* We must ensure the session is initialised first */
728 error = nfs4_init_session(server);
732 /* Probe the root fh to retrieve its FSID and filehandle */
733 error = nfs4_get_rootfh(server, mntfh);
737 dprintk("Server FSID: %llx:%llx\n",
738 (unsigned long long) server->fsid.major,
739 (unsigned long long) server->fsid.minor);
740 dprintk("Mount FH: %d\n", mntfh->size);
742 nfs4_session_set_rwsize(server);
744 error = nfs_probe_fsinfo(server, mntfh, fattr);
748 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
749 server->namelen = NFS4_MAXNAMLEN;
751 nfs_server_insert_lists(server);
752 server->mount_time = jiffies;
753 server->destroy = nfs4_destroy_server;
755 nfs_free_fattr(fattr);
760 * Create a version 4 volume record
762 static int nfs4_init_server(struct nfs_server *server,
763 const struct nfs_parsed_mount_data *data)
765 struct rpc_timeout timeparms;
768 dprintk("--> nfs4_init_server()\n");
770 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
771 data->timeo, data->retrans);
773 /* Initialise the client representation from the mount data */
774 server->flags = data->flags;
775 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
776 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
777 server->caps |= NFS_CAP_READDIRPLUS;
778 server->options = data->options;
780 /* Get a client record */
781 error = nfs4_set_client(server,
782 data->nfs_server.hostname,
783 (const struct sockaddr *)&data->nfs_server.address,
784 data->nfs_server.addrlen,
785 data->client_address,
786 data->auth_flavors[0],
787 data->nfs_server.protocol,
795 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
798 if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX)
799 server->caps |= NFS_CAP_UIDGID_NOMAP;
802 server->rsize = nfs_block_size(data->rsize, NULL);
804 server->wsize = nfs_block_size(data->wsize, NULL);
806 server->acregmin = data->acregmin * HZ;
807 server->acregmax = data->acregmax * HZ;
808 server->acdirmin = data->acdirmin * HZ;
809 server->acdirmax = data->acdirmax * HZ;
811 server->port = data->nfs_server.port;
813 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
817 dprintk("<-- nfs4_init_server() = %d\n", error);
822 * Create a version 4 volume record
823 * - keyed on server and FSID
825 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
826 struct nfs_fh *mntfh)*/
827 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
828 struct nfs_subversion *nfs_mod)
830 struct nfs_server *server;
833 dprintk("--> nfs4_create_server()\n");
835 server = nfs_alloc_server();
837 return ERR_PTR(-ENOMEM);
839 /* set up the general RPC client */
840 error = nfs4_init_server(server, mount_info->parsed);
844 error = nfs4_server_common_setup(server, mount_info->mntfh);
848 dprintk("<-- nfs4_create_server() = %p\n", server);
852 nfs_free_server(server);
853 dprintk("<-- nfs4_create_server() = error %d\n", error);
854 return ERR_PTR(error);
858 * Create an NFS4 referral server record
860 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
861 struct nfs_fh *mntfh)
863 struct nfs_client *parent_client;
864 struct nfs_server *server, *parent_server;
867 dprintk("--> nfs4_create_referral_server()\n");
869 server = nfs_alloc_server();
871 return ERR_PTR(-ENOMEM);
873 parent_server = NFS_SB(data->sb);
874 parent_client = parent_server->nfs_client;
876 /* Initialise the client representation from the parent server */
877 nfs_server_copy_userdata(server, parent_server);
878 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
880 /* Get a client representation.
881 * Note: NFSv4 always uses TCP, */
882 error = nfs4_set_client(server, data->hostname,
885 parent_client->cl_ipaddr,
887 rpc_protocol(parent_server->client),
888 parent_server->client->cl_timeout,
889 parent_client->cl_mvops->minor_version,
890 parent_client->cl_net);
894 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
898 error = nfs4_server_common_setup(server, mntfh);
902 dprintk("<-- nfs_create_referral_server() = %p\n", server);
906 nfs_free_server(server);
907 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
908 return ERR_PTR(error);