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>
13 #include <linux/sunrpc/rpc_pipe_fs.h>
16 #include "delegation.h"
17 #include "nfs4session.h"
21 #define NFSDBG_FACILITY NFSDBG_CLIENT
24 * Get a unique NFSv4.0 callback identifier which will be used
25 * by the V4.0 callback service to lookup the nfs_client struct
27 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
30 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
32 if (clp->rpc_ops->version != 4 || minorversion != 0)
34 idr_preload(GFP_KERNEL);
35 spin_lock(&nn->nfs_client_lock);
36 ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT);
38 clp->cl_cb_ident = ret;
39 spin_unlock(&nn->nfs_client_lock);
41 return ret < 0 ? ret : 0;
44 #ifdef CONFIG_NFS_V4_1
46 * Per auth flavor data server rpc clients
48 struct nfs4_ds_server {
49 struct list_head list; /* ds_clp->cl_ds_clients */
50 struct rpc_clnt *rpc_clnt;
54 * Common lookup case for DS I/O
56 static struct nfs4_ds_server *
57 nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
59 struct nfs4_ds_server *dss;
62 list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) {
63 if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
73 static struct nfs4_ds_server *
74 nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor,
75 struct nfs4_ds_server *new)
77 struct nfs4_ds_server *dss;
79 spin_lock(&ds_clp->cl_lock);
80 list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) {
81 if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
86 list_add_rcu(&new->list, &ds_clp->cl_ds_clients);
89 spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
93 static struct nfs4_ds_server *
94 nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
96 struct nfs4_ds_server *dss;
98 dss = kmalloc(sizeof(*dss), GFP_NOFS);
100 return ERR_PTR(-ENOMEM);
102 dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor);
103 if (IS_ERR(dss->rpc_clnt)) {
104 int err = PTR_ERR(dss->rpc_clnt);
108 INIT_LIST_HEAD(&dss->list);
114 nfs4_free_ds_server(struct nfs4_ds_server *dss)
116 rpc_release_client(dss->rpc_clnt);
121 * Find or create a DS rpc client with th MDS server rpc client auth flavor
122 * in the nfs_client cl_ds_clients list.
125 nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode)
127 struct nfs4_ds_server *dss, *new;
128 rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor;
130 dss = nfs4_find_ds_client(ds_clp, flavor);
133 new = nfs4_alloc_ds_server(ds_clp, flavor);
135 return ERR_CAST(new);
136 dss = nfs4_add_ds_client(ds_clp, flavor, new);
138 nfs4_free_ds_server(new);
140 return dss->rpc_clnt;
142 EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
145 nfs4_shutdown_ds_clients(struct nfs_client *clp)
147 struct nfs4_ds_server *dss;
148 LIST_HEAD(shutdown_list);
150 while (!list_empty(&clp->cl_ds_clients)) {
151 dss = list_entry(clp->cl_ds_clients.next,
152 struct nfs4_ds_server, list);
153 list_del(&dss->list);
154 rpc_shutdown_client(dss->rpc_clnt);
159 void nfs41_shutdown_client(struct nfs_client *clp)
161 if (nfs4_has_session(clp)) {
162 nfs4_shutdown_ds_clients(clp);
163 nfs4_destroy_session(clp->cl_session);
164 nfs4_destroy_clientid(clp);
168 #endif /* CONFIG_NFS_V4_1 */
170 void nfs40_shutdown_client(struct nfs_client *clp)
172 if (clp->cl_slot_tbl) {
173 nfs4_shutdown_slot_table(clp->cl_slot_tbl);
174 kfree(clp->cl_slot_tbl);
178 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
181 struct nfs_client *clp = nfs_alloc_client(cl_init);
185 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
189 if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
194 spin_lock_init(&clp->cl_lock);
195 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
196 INIT_LIST_HEAD(&clp->cl_ds_clients);
197 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
198 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
199 clp->cl_minorversion = cl_init->minorversion;
200 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
205 nfs_free_client(clp);
210 * Destroy the NFS4 callback service
212 static void nfs4_destroy_callback(struct nfs_client *clp)
214 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
215 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
218 static void nfs4_shutdown_client(struct nfs_client *clp)
220 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
221 nfs4_kill_renewd(clp);
222 clp->cl_mvops->shutdown_client(clp);
223 nfs4_destroy_callback(clp);
224 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
225 nfs_idmap_delete(clp);
227 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
228 kfree(clp->cl_serverowner);
229 kfree(clp->cl_serverscope);
230 kfree(clp->cl_implid);
233 void nfs4_free_client(struct nfs_client *clp)
235 nfs4_shutdown_client(clp);
236 nfs_free_client(clp);
240 * Initialize the NFS4 callback service
242 static int nfs4_init_callback(struct nfs_client *clp)
246 if (clp->rpc_ops->version == 4) {
247 struct rpc_xprt *xprt;
249 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
251 if (nfs4_has_session(clp)) {
252 error = xprt_setup_backchannel(xprt,
253 NFS41_BC_MIN_CALLBACKS);
258 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
260 dprintk("%s: failed to start callback. Error = %d\n",
264 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
270 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
271 * @clp - nfs_client to initialize
273 * Returns zero on success, or a negative errno if some error occurred.
275 int nfs40_init_client(struct nfs_client *clp)
277 struct nfs4_slot_table *tbl;
280 tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
284 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
285 "NFSv4.0 transport Slot table");
291 clp->cl_slot_tbl = tbl;
295 #if defined(CONFIG_NFS_V4_1)
298 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
299 * @clp - nfs_client to initialize
301 * Returns zero on success, or a negative errno if some error occurred.
303 int nfs41_init_client(struct nfs_client *clp)
305 struct nfs4_session *session = NULL;
308 * Create the session and mark it expired.
309 * When a SEQUENCE operation encounters the expired session
310 * it will do session recovery to initialize it.
312 session = nfs4_alloc_session(clp);
316 clp->cl_session = session;
319 * The create session reply races with the server back
320 * channel probe. Mark the client NFS_CS_SESSION_INITING
321 * so that the client back channel can find the
324 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
328 #endif /* CONFIG_NFS_V4_1 */
331 * Initialize the minor version specific parts of an NFS4 client record
333 static int nfs4_init_client_minor_version(struct nfs_client *clp)
337 ret = clp->cl_mvops->init_client(clp);
340 return nfs4_init_callback(clp);
344 * nfs4_init_client - Initialise an NFS4 client record
346 * @clp: nfs_client to initialise
347 * @timeparms: timeout parameters for underlying RPC transport
348 * @ip_addr: callback IP address in presentation format
349 * @authflavor: authentication flavor for underlying RPC transport
351 * Returns pointer to an NFS client, or an ERR_PTR value.
353 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
354 const struct rpc_timeout *timeparms,
357 char buf[INET6_ADDRSTRLEN + 1];
358 struct nfs_client *old;
361 if (clp->cl_cons_state == NFS_CS_READY) {
362 /* the client is initialised already */
363 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
367 /* Check NFS protocol revision and initialize RPC op vector */
368 clp->rpc_ops = &nfs_v4_clientops;
370 if (clp->cl_minorversion != 0)
371 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
372 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
373 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
375 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_GSS_KRB5I);
376 if (error == -EINVAL)
377 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
381 /* If no clientaddr= option was specified, find a usable cb address */
382 if (ip_addr == NULL) {
383 struct sockaddr_storage cb_addr;
384 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
386 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
389 error = rpc_ntop(sap, buf, sizeof(buf));
392 ip_addr = (const char *)buf;
394 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
396 error = nfs_idmap_new(clp);
398 dprintk("%s: failed to create idmapper. Error = %d\n",
402 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
404 error = nfs4_init_client_minor_version(clp);
408 if (!nfs4_has_session(clp))
409 nfs_mark_client_ready(clp, NFS_CS_READY);
411 error = nfs4_discover_server_trunking(clp, &old);
416 clp->cl_preserve_clid = true;
421 nfs_mark_client_ready(clp, error);
423 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
424 return ERR_PTR(error);
428 * SETCLIENTID just did a callback update with the callback ident in
429 * "drop," but server trunking discovery claims "drop" and "keep" are
430 * actually the same server. Swap the callback IDs so that "keep"
431 * will continue to use the callback ident the server now knows about,
432 * and so that "keep"'s original callback ident is destroyed when
435 static void nfs4_swap_callback_idents(struct nfs_client *keep,
436 struct nfs_client *drop)
438 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
439 unsigned int save = keep->cl_cb_ident;
441 if (keep->cl_cb_ident == drop->cl_cb_ident)
444 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
445 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
447 spin_lock(&nn->nfs_client_lock);
449 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
450 keep->cl_cb_ident = drop->cl_cb_ident;
452 idr_replace(&nn->cb_ident_idr, drop, save);
453 drop->cl_cb_ident = save;
455 spin_unlock(&nn->nfs_client_lock);
459 * nfs40_walk_client_list - Find server that recognizes a client ID
461 * @new: nfs_client with client ID to test
462 * @result: OUT: found nfs_client, or new
463 * @cred: credential to use for trunking test
465 * Returns zero, a negative errno, or a negative NFS4ERR status.
466 * If zero is returned, an nfs_client pointer is planted in "result."
468 * NB: nfs40_walk_client_list() relies on the new nfs_client being
469 * the last nfs_client on the list.
471 int nfs40_walk_client_list(struct nfs_client *new,
472 struct nfs_client **result,
473 struct rpc_cred *cred)
475 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
476 struct nfs_client *pos, *prev = NULL;
477 struct nfs4_setclientid_res clid = {
478 .clientid = new->cl_clientid,
479 .confirm = new->cl_confirm,
481 int status = -NFS4ERR_STALE_CLIENTID;
483 spin_lock(&nn->nfs_client_lock);
484 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
486 if (pos->rpc_ops != new->rpc_ops)
489 if (pos->cl_proto != new->cl_proto)
492 if (pos->cl_minorversion != new->cl_minorversion)
495 /* If "pos" isn't marked ready, we can't trust the
496 * remaining fields in "pos" */
497 if (pos->cl_cons_state > NFS_CS_READY) {
498 atomic_inc(&pos->cl_count);
499 spin_unlock(&nn->nfs_client_lock);
502 nfs_put_client(prev);
505 status = nfs_wait_client_init_complete(pos);
508 status = -NFS4ERR_STALE_CLIENTID;
509 spin_lock(&nn->nfs_client_lock);
511 if (pos->cl_cons_state != NFS_CS_READY)
514 if (pos->cl_clientid != new->cl_clientid)
517 atomic_inc(&pos->cl_count);
518 spin_unlock(&nn->nfs_client_lock);
521 nfs_put_client(prev);
524 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
526 case -NFS4ERR_STALE_CLIENTID:
529 nfs4_swap_callback_idents(pos, new);
533 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
534 __func__, pos, atomic_read(&pos->cl_count));
538 /* The callback path may have been inadvertently
539 * changed. Schedule recovery!
541 nfs4_schedule_path_down_recovery(pos);
546 spin_lock(&nn->nfs_client_lock);
548 spin_unlock(&nn->nfs_client_lock);
550 /* No match found. The server lost our clientid */
553 nfs_put_client(prev);
554 dprintk("NFS: <-- %s status = %d\n", __func__, status);
558 #ifdef CONFIG_NFS_V4_1
560 * Returns true if the client IDs match
562 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
564 if (a->cl_clientid != b->cl_clientid) {
565 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
566 __func__, a->cl_clientid, b->cl_clientid);
569 dprintk("NFS: --> %s client ID %llx matches %llx\n",
570 __func__, a->cl_clientid, b->cl_clientid);
575 * Returns true if the server major ids match
578 nfs4_check_clientid_trunking(struct nfs_client *a, struct nfs_client *b)
580 struct nfs41_server_owner *o1 = a->cl_serverowner;
581 struct nfs41_server_owner *o2 = b->cl_serverowner;
583 if (o1->major_id_sz != o2->major_id_sz)
584 goto out_major_mismatch;
585 if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
586 goto out_major_mismatch;
588 dprintk("NFS: --> %s server owners match\n", __func__);
592 dprintk("NFS: --> %s server owner major IDs do not match\n",
598 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
600 * @new: nfs_client with client ID to test
601 * @result: OUT: found nfs_client, or new
602 * @cred: credential to use for trunking test
604 * Returns zero, a negative errno, or a negative NFS4ERR status.
605 * If zero is returned, an nfs_client pointer is planted in "result."
607 * NB: nfs41_walk_client_list() relies on the new nfs_client being
608 * the last nfs_client on the list.
610 int nfs41_walk_client_list(struct nfs_client *new,
611 struct nfs_client **result,
612 struct rpc_cred *cred)
614 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
615 struct nfs_client *pos, *prev = NULL;
616 int status = -NFS4ERR_STALE_CLIENTID;
618 spin_lock(&nn->nfs_client_lock);
619 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
621 if (pos->rpc_ops != new->rpc_ops)
624 if (pos->cl_proto != new->cl_proto)
627 if (pos->cl_minorversion != new->cl_minorversion)
630 /* If "pos" isn't marked ready, we can't trust the
631 * remaining fields in "pos", especially the client
632 * ID and serverowner fields. Wait for CREATE_SESSION
634 if (pos->cl_cons_state > NFS_CS_READY) {
635 atomic_inc(&pos->cl_count);
636 spin_unlock(&nn->nfs_client_lock);
639 nfs_put_client(prev);
642 status = nfs_wait_client_init_complete(pos);
643 if (pos->cl_cons_state == NFS_CS_SESSION_INITING) {
644 nfs4_schedule_lease_recovery(pos);
645 status = nfs4_wait_clnt_recover(pos);
647 spin_lock(&nn->nfs_client_lock);
650 status = -NFS4ERR_STALE_CLIENTID;
652 if (pos->cl_cons_state != NFS_CS_READY)
655 if (!nfs4_match_clientids(pos, new))
659 * Note that session trunking is just a special subcase of
660 * client id trunking. In either case, we want to fall back
661 * to using the existing nfs_client.
663 if (!nfs4_check_clientid_trunking(pos, new))
666 atomic_inc(&pos->cl_count);
669 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
670 __func__, pos, atomic_read(&pos->cl_count));
674 /* No matching nfs_client found. */
675 spin_unlock(&nn->nfs_client_lock);
676 dprintk("NFS: <-- %s status = %d\n", __func__, status);
678 nfs_put_client(prev);
681 #endif /* CONFIG_NFS_V4_1 */
683 static void nfs4_destroy_server(struct nfs_server *server)
687 nfs_server_return_all_delegations(server);
688 unset_pnfs_layoutdriver(server);
689 nfs4_purge_state_owners(server, &freeme);
690 nfs4_free_state_owners(&freeme);
694 * NFSv4.0 callback thread helper
696 * Find a client by callback identifier
699 nfs4_find_client_ident(struct net *net, int cb_ident)
701 struct nfs_client *clp;
702 struct nfs_net *nn = net_generic(net, nfs_net_id);
704 spin_lock(&nn->nfs_client_lock);
705 clp = idr_find(&nn->cb_ident_idr, cb_ident);
707 atomic_inc(&clp->cl_count);
708 spin_unlock(&nn->nfs_client_lock);
712 #if defined(CONFIG_NFS_V4_1)
713 /* Common match routine for v4.0 and v4.1 callback services */
714 static bool nfs4_cb_match_client(const struct sockaddr *addr,
715 struct nfs_client *clp, u32 minorversion)
717 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
719 /* Don't match clients that failed to initialise */
720 if (!(clp->cl_cons_state == NFS_CS_READY ||
721 clp->cl_cons_state == NFS_CS_SESSION_INITING))
726 /* Match the version and minorversion */
727 if (clp->rpc_ops->version != 4 ||
728 clp->cl_minorversion != minorversion)
731 /* Match only the IP address, not the port number */
732 if (!nfs_sockaddr_match_ipaddr(addr, clap))
739 * NFSv4.1 callback thread helper
740 * For CB_COMPOUND calls, find a client by IP address, protocol version,
741 * minorversion, and sessionID
743 * Returns NULL if no such client
746 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
747 struct nfs4_sessionid *sid, u32 minorversion)
749 struct nfs_client *clp;
750 struct nfs_net *nn = net_generic(net, nfs_net_id);
752 spin_lock(&nn->nfs_client_lock);
753 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
754 if (nfs4_cb_match_client(addr, clp, minorversion) == false)
757 if (!nfs4_has_session(clp))
761 if (memcmp(clp->cl_session->sess_id.data,
762 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
765 atomic_inc(&clp->cl_count);
766 spin_unlock(&nn->nfs_client_lock);
769 spin_unlock(&nn->nfs_client_lock);
773 #else /* CONFIG_NFS_V4_1 */
776 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
777 struct nfs4_sessionid *sid, u32 minorversion)
781 #endif /* CONFIG_NFS_V4_1 */
784 * Set up an NFS4 client
786 static int nfs4_set_client(struct nfs_server *server,
787 const char *hostname,
788 const struct sockaddr *addr,
789 const size_t addrlen,
791 rpc_authflavor_t authflavour,
792 int proto, const struct rpc_timeout *timeparms,
793 u32 minorversion, struct net *net)
795 struct nfs_client_initdata cl_init = {
796 .hostname = hostname,
801 .minorversion = minorversion,
804 struct nfs_client *clp;
807 dprintk("--> nfs4_set_client()\n");
809 if (server->flags & NFS_MOUNT_NORESVPORT)
810 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
811 if (server->options & NFS_OPTION_MIGRATION)
812 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
814 /* Allocate or find a client reference we can use */
815 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
817 error = PTR_ERR(clp);
822 * Query for the lease time on clientid setup or renewal
824 * Note that this will be set on nfs_clients that were created
825 * only for the DS role and did not set this bit, but now will
828 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
830 server->nfs_client = clp;
831 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
834 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
839 * Set up a pNFS Data Server client.
841 * Return any existing nfs_client that matches server address,port,version
844 * For a new nfs_client, use a soft mount (default), a low retrans and a
845 * low timeout interval so that if a connection is lost, we retry through
848 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
849 const struct sockaddr *ds_addr, int ds_addrlen,
850 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
852 struct nfs_client_initdata cl_init = {
854 .addrlen = ds_addrlen,
857 .minorversion = mds_clp->cl_minorversion,
858 .net = mds_clp->cl_net,
860 struct rpc_timeout ds_timeout;
861 struct nfs_client *clp;
864 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
865 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
866 * (section 13.1 RFC 5661).
868 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
869 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
870 mds_clp->cl_rpcclient->cl_auth->au_flavor);
872 dprintk("<-- %s %p\n", __func__, clp);
875 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
878 * Session has been established, and the client marked ready.
879 * Set the mount rsize and wsize with negotiated fore channel
880 * attributes which will be bound checked in nfs_server_set_fsinfo.
882 static void nfs4_session_set_rwsize(struct nfs_server *server)
884 #ifdef CONFIG_NFS_V4_1
885 struct nfs4_session *sess;
889 if (!nfs4_has_session(server->nfs_client))
891 sess = server->nfs_client->cl_session;
892 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
893 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
895 if (server->rsize > server_resp_sz)
896 server->rsize = server_resp_sz;
897 if (server->wsize > server_rqst_sz)
898 server->wsize = server_rqst_sz;
899 #endif /* CONFIG_NFS_V4_1 */
902 static int nfs4_server_common_setup(struct nfs_server *server,
903 struct nfs_fh *mntfh, bool auth_probe)
905 struct nfs_fattr *fattr;
908 /* data servers support only a subset of NFSv4.1 */
909 if (is_ds_only_client(server->nfs_client))
910 return -EPROTONOSUPPORT;
912 fattr = nfs_alloc_fattr();
916 /* We must ensure the session is initialised first */
917 error = nfs4_init_session(server->nfs_client);
921 /* Set the basic capabilities */
922 server->caps |= server->nfs_client->cl_mvops->init_caps;
923 if (server->flags & NFS_MOUNT_NORDIRPLUS)
924 server->caps &= ~NFS_CAP_READDIRPLUS;
926 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
929 if (nfs4_disable_idmapping &&
930 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
931 server->caps |= NFS_CAP_UIDGID_NOMAP;
934 /* Probe the root fh to retrieve its FSID and filehandle */
935 error = nfs4_get_rootfh(server, mntfh, auth_probe);
939 dprintk("Server FSID: %llx:%llx\n",
940 (unsigned long long) server->fsid.major,
941 (unsigned long long) server->fsid.minor);
942 nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
944 nfs4_session_set_rwsize(server);
946 error = nfs_probe_fsinfo(server, mntfh, fattr);
950 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
951 server->namelen = NFS4_MAXNAMLEN;
953 nfs_server_insert_lists(server);
954 server->mount_time = jiffies;
955 server->destroy = nfs4_destroy_server;
957 nfs_free_fattr(fattr);
962 * Create a version 4 volume record
964 static int nfs4_init_server(struct nfs_server *server,
965 struct nfs_parsed_mount_data *data)
967 struct rpc_timeout timeparms;
970 dprintk("--> nfs4_init_server()\n");
972 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
973 data->timeo, data->retrans);
975 /* Initialise the client representation from the mount data */
976 server->flags = data->flags;
977 server->options = data->options;
978 server->auth_info = data->auth_info;
980 /* Use the first specified auth flavor. If this flavor isn't
981 * allowed by the server, use the SECINFO path to try the
982 * other specified flavors */
983 if (data->auth_info.flavor_len >= 1)
984 data->selected_flavor = data->auth_info.flavors[0];
986 data->selected_flavor = RPC_AUTH_UNIX;
988 /* Get a client record */
989 error = nfs4_set_client(server,
990 data->nfs_server.hostname,
991 (const struct sockaddr *)&data->nfs_server.address,
992 data->nfs_server.addrlen,
993 data->client_address,
994 data->selected_flavor,
995 data->nfs_server.protocol,
1003 server->rsize = nfs_block_size(data->rsize, NULL);
1005 server->wsize = nfs_block_size(data->wsize, NULL);
1007 server->acregmin = data->acregmin * HZ;
1008 server->acregmax = data->acregmax * HZ;
1009 server->acdirmin = data->acdirmin * HZ;
1010 server->acdirmax = data->acdirmax * HZ;
1012 server->port = data->nfs_server.port;
1014 error = nfs_init_server_rpcclient(server, &timeparms,
1015 data->selected_flavor);
1019 dprintk("<-- nfs4_init_server() = %d\n", error);
1024 * Create a version 4 volume record
1025 * - keyed on server and FSID
1027 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1028 struct nfs_fh *mntfh)*/
1029 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
1030 struct nfs_subversion *nfs_mod)
1032 struct nfs_server *server;
1036 dprintk("--> nfs4_create_server()\n");
1038 server = nfs_alloc_server();
1040 return ERR_PTR(-ENOMEM);
1042 auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
1044 /* set up the general RPC client */
1045 error = nfs4_init_server(server, mount_info->parsed);
1049 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
1053 dprintk("<-- nfs4_create_server() = %p\n", server);
1057 nfs_free_server(server);
1058 dprintk("<-- nfs4_create_server() = error %d\n", error);
1059 return ERR_PTR(error);
1063 * Create an NFS4 referral server record
1065 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1066 struct nfs_fh *mntfh)
1068 struct nfs_client *parent_client;
1069 struct nfs_server *server, *parent_server;
1073 dprintk("--> nfs4_create_referral_server()\n");
1075 server = nfs_alloc_server();
1077 return ERR_PTR(-ENOMEM);
1079 parent_server = NFS_SB(data->sb);
1080 parent_client = parent_server->nfs_client;
1082 /* Initialise the client representation from the parent server */
1083 nfs_server_copy_userdata(server, parent_server);
1085 /* Get a client representation.
1086 * Note: NFSv4 always uses TCP, */
1087 error = nfs4_set_client(server, data->hostname,
1090 parent_client->cl_ipaddr,
1092 rpc_protocol(parent_server->client),
1093 parent_server->client->cl_timeout,
1094 parent_client->cl_mvops->minor_version,
1095 parent_client->cl_net);
1099 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1103 auth_probe = parent_server->auth_info.flavor_len < 1;
1105 error = nfs4_server_common_setup(server, mntfh, auth_probe);
1109 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1113 nfs_free_server(server);
1114 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1115 return ERR_PTR(error);
1119 * Grab the destination's particulars, including lease expiry time.
1121 * Returns zero if probe succeeded and retrieved FSID matches the FSID
1124 static int nfs_probe_destination(struct nfs_server *server)
1126 struct inode *inode = server->super->s_root->d_inode;
1127 struct nfs_fattr *fattr;
1130 fattr = nfs_alloc_fattr();
1134 /* Sanity: the probe won't work if the destination server
1135 * does not recognize the migrated FH. */
1136 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1138 nfs_free_fattr(fattr);
1143 * nfs4_update_server - Move an nfs_server to a different nfs_client
1145 * @server: represents FSID to be moved
1146 * @hostname: new end-point's hostname
1147 * @sap: new end-point's socket address
1148 * @salen: size of "sap"
1149 * @net: net namespace
1151 * The nfs_server must be quiescent before this function is invoked.
1152 * Either its session is drained (NFSv4.1+), or its transport is
1153 * plugged and drained (NFSv4.0).
1155 * Returns zero on success, or a negative errno value.
1157 int nfs4_update_server(struct nfs_server *server, const char *hostname,
1158 struct sockaddr *sap, size_t salen, struct net *net)
1160 struct nfs_client *clp = server->nfs_client;
1161 struct rpc_clnt *clnt = server->client;
1162 struct xprt_create xargs = {
1163 .ident = clp->cl_proto,
1167 .servername = hostname,
1169 char buf[INET6_ADDRSTRLEN + 1];
1170 struct sockaddr_storage address;
1171 struct sockaddr *localaddr = (struct sockaddr *)&address;
1174 dprintk("--> %s: move FSID %llx:%llx to \"%s\")\n", __func__,
1175 (unsigned long long)server->fsid.major,
1176 (unsigned long long)server->fsid.minor,
1179 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1181 dprintk("<-- %s(): rpc_switch_client_transport returned %d\n",
1186 error = rpc_localaddr(clnt, localaddr, sizeof(address));
1188 dprintk("<-- %s(): rpc_localaddr returned %d\n",
1193 error = -EAFNOSUPPORT;
1194 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) {
1195 dprintk("<-- %s(): rpc_ntop returned %d\n",
1200 nfs_server_remove_lists(server);
1201 error = nfs4_set_client(server, hostname, sap, salen, buf,
1202 clp->cl_rpcclient->cl_auth->au_flavor,
1203 clp->cl_proto, clnt->cl_timeout,
1204 clp->cl_minorversion, net);
1205 nfs_put_client(clp);
1207 nfs_server_insert_lists(server);
1208 dprintk("<-- %s(): nfs4_set_client returned %d\n",
1213 if (server->nfs_client->cl_hostname == NULL)
1214 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1215 nfs_server_insert_lists(server);
1217 error = nfs_probe_destination(server);
1221 dprintk("<-- %s() succeeded\n", __func__);