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_mount.h>
8 #include <linux/sunrpc/addr.h>
9 #include <linux/sunrpc/auth.h>
10 #include <linux/sunrpc/xprt.h>
11 #include <linux/sunrpc/bc_xprt.h>
12 #include <linux/sunrpc/rpc_pipe_fs.h>
15 #include "delegation.h"
16 #include "nfs4session.h"
17 #include "nfs4idmap.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];
202 #if IS_ENABLED(CONFIG_NFS_V4_1)
203 init_waitqueue_head(&clp->cl_lock_waitq);
208 nfs_free_client(clp);
213 * Destroy the NFS4 callback service
215 static void nfs4_destroy_callback(struct nfs_client *clp)
217 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
218 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
221 static void nfs4_shutdown_client(struct nfs_client *clp)
223 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
224 nfs4_kill_renewd(clp);
225 clp->cl_mvops->shutdown_client(clp);
226 nfs4_destroy_callback(clp);
227 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
228 nfs_idmap_delete(clp);
230 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
231 kfree(clp->cl_serverowner);
232 kfree(clp->cl_serverscope);
233 kfree(clp->cl_implid);
234 kfree(clp->cl_owner_id);
237 void nfs4_free_client(struct nfs_client *clp)
239 nfs4_shutdown_client(clp);
240 nfs_free_client(clp);
244 * Initialize the NFS4 callback service
246 static int nfs4_init_callback(struct nfs_client *clp)
248 struct rpc_xprt *xprt;
251 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
253 if (nfs4_has_session(clp)) {
254 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
259 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
261 dprintk("%s: failed to start callback. Error = %d\n",
265 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
271 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
272 * @clp - nfs_client to initialize
274 * Returns zero on success, or a negative errno if some error occurred.
276 int nfs40_init_client(struct nfs_client *clp)
278 struct nfs4_slot_table *tbl;
281 tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
285 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
286 "NFSv4.0 transport Slot table");
292 clp->cl_slot_tbl = tbl;
296 #if defined(CONFIG_NFS_V4_1)
299 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
300 * @clp - nfs_client to initialize
302 * Returns zero on success, or a negative errno if some error occurred.
304 int nfs41_init_client(struct nfs_client *clp)
306 struct nfs4_session *session = NULL;
309 * Create the session and mark it expired.
310 * When a SEQUENCE operation encounters the expired session
311 * it will do session recovery to initialize it.
313 session = nfs4_alloc_session(clp);
317 clp->cl_session = session;
320 * The create session reply races with the server back
321 * channel probe. Mark the client NFS_CS_SESSION_INITING
322 * so that the client back channel can find the
325 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
329 #endif /* CONFIG_NFS_V4_1 */
332 * Initialize the minor version specific parts of an NFS4 client record
334 static int nfs4_init_client_minor_version(struct nfs_client *clp)
338 ret = clp->cl_mvops->init_client(clp);
341 return nfs4_init_callback(clp);
345 * nfs4_init_client - Initialise an NFS4 client record
347 * @clp: nfs_client to initialise
348 * @timeparms: timeout parameters for underlying RPC transport
349 * @ip_addr: callback IP address in presentation format
350 * @authflavor: authentication flavor for underlying RPC transport
352 * Returns pointer to an NFS client, or an ERR_PTR value.
354 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
355 const struct nfs_client_initdata *cl_init)
357 char buf[INET6_ADDRSTRLEN + 1];
358 const char *ip_addr = cl_init->ip_addr;
359 struct nfs_client *old;
362 if (clp->cl_cons_state == NFS_CS_READY)
363 /* the client is initialised already */
366 /* Check NFS protocol revision and initialize RPC op vector */
367 clp->rpc_ops = &nfs_v4_clientops;
369 if (clp->cl_minorversion != 0)
370 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
371 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
372 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
374 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
375 if (error == -EINVAL)
376 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
380 /* If no clientaddr= option was specified, find a usable cb address */
381 if (ip_addr == NULL) {
382 struct sockaddr_storage cb_addr;
383 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
385 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
388 error = rpc_ntop(sap, buf, sizeof(buf));
391 ip_addr = (const char *)buf;
393 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
395 error = nfs_idmap_new(clp);
397 dprintk("%s: failed to create idmapper. Error = %d\n",
401 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
403 error = nfs4_init_client_minor_version(clp);
407 if (!nfs4_has_session(clp))
408 nfs_mark_client_ready(clp, NFS_CS_READY);
410 error = nfs4_discover_server_trunking(clp, &old);
415 clp->cl_preserve_clid = true;
417 clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags);
421 nfs_mark_client_ready(clp, error);
423 return ERR_PTR(error);
427 * SETCLIENTID just did a callback update with the callback ident in
428 * "drop," but server trunking discovery claims "drop" and "keep" are
429 * actually the same server. Swap the callback IDs so that "keep"
430 * will continue to use the callback ident the server now knows about,
431 * and so that "keep"'s original callback ident is destroyed when
434 static void nfs4_swap_callback_idents(struct nfs_client *keep,
435 struct nfs_client *drop)
437 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
438 unsigned int save = keep->cl_cb_ident;
440 if (keep->cl_cb_ident == drop->cl_cb_ident)
443 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
444 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
446 spin_lock(&nn->nfs_client_lock);
448 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
449 keep->cl_cb_ident = drop->cl_cb_ident;
451 idr_replace(&nn->cb_ident_idr, drop, save);
452 drop->cl_cb_ident = save;
454 spin_unlock(&nn->nfs_client_lock);
457 static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
458 const struct nfs_client *clp2)
460 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
462 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
465 static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2)
467 return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0;
470 static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new,
471 struct nfs_client **prev, struct nfs_net *nn)
475 if (pos->rpc_ops != new->rpc_ops)
478 if (pos->cl_minorversion != new->cl_minorversion)
481 /* If "pos" isn't marked ready, we can't trust the
482 * remaining fields in "pos", especially the client
483 * ID and serverowner fields. Wait for CREATE_SESSION
485 if (pos->cl_cons_state > NFS_CS_READY) {
486 atomic_inc(&pos->cl_count);
487 spin_unlock(&nn->nfs_client_lock);
489 nfs_put_client(*prev);
492 status = nfs_wait_client_init_complete(pos);
493 spin_lock(&nn->nfs_client_lock);
499 if (pos->cl_cons_state != NFS_CS_READY)
502 if (pos->cl_clientid != new->cl_clientid)
505 /* NFSv4.1 always uses the uniform string, however someone
506 * might switch the uniquifier string on us.
508 if (!nfs4_match_client_owner_id(pos, new))
515 * nfs40_walk_client_list - Find server that recognizes a client ID
517 * @new: nfs_client with client ID to test
518 * @result: OUT: found nfs_client, or new
519 * @cred: credential to use for trunking test
521 * Returns zero, a negative errno, or a negative NFS4ERR status.
522 * If zero is returned, an nfs_client pointer is planted in "result."
524 * NB: nfs40_walk_client_list() relies on the new nfs_client being
525 * the last nfs_client on the list.
527 int nfs40_walk_client_list(struct nfs_client *new,
528 struct nfs_client **result,
529 struct rpc_cred *cred)
531 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
532 struct nfs_client *pos, *prev = NULL;
533 struct nfs4_setclientid_res clid = {
534 .clientid = new->cl_clientid,
535 .confirm = new->cl_confirm,
537 int status = -NFS4ERR_STALE_CLIENTID;
539 spin_lock(&nn->nfs_client_lock);
540 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
542 status = nfs4_match_client(pos, new, &prev, nn);
548 * We just sent a new SETCLIENTID, which should have
549 * caused the server to return a new cl_confirm. So if
550 * cl_confirm is the same, then this is a different
551 * server that just returned the same cl_confirm by
554 if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm,
558 * But if the cl_confirm's are different, then the only
559 * way that a SETCLIENTID_CONFIRM to pos can succeed is
560 * if new and pos point to the same server:
562 atomic_inc(&pos->cl_count);
563 spin_unlock(&nn->nfs_client_lock);
565 nfs_put_client(prev);
568 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
570 case -NFS4ERR_STALE_CLIENTID:
573 nfs4_swap_callback_idents(pos, new);
574 pos->cl_confirm = new->cl_confirm;
581 /* The callback path may have been inadvertently
582 * changed. Schedule recovery!
584 nfs4_schedule_path_down_recovery(pos);
589 spin_lock(&nn->nfs_client_lock);
592 spin_unlock(&nn->nfs_client_lock);
594 /* No match found. The server lost our clientid */
596 nfs_put_client(prev);
600 #ifdef CONFIG_NFS_V4_1
602 * Returns true if the server major ids match
605 nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
606 struct nfs41_server_owner *o2)
608 if (o1->major_id_sz != o2->major_id_sz)
610 return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0;
614 * Returns true if the server scopes match
617 nfs4_check_server_scope(struct nfs41_server_scope *s1,
618 struct nfs41_server_scope *s2)
620 if (s1->server_scope_sz != s2->server_scope_sz)
622 return memcmp(s1->server_scope, s2->server_scope,
623 s1->server_scope_sz) == 0;
627 * nfs4_detect_session_trunking - Checks for session trunking.
629 * Called after a successful EXCHANGE_ID on a multi-addr connection.
630 * Upon success, add the transport.
632 * @clp: original mount nfs_client
633 * @res: result structure from an exchange_id using the original mount
634 * nfs_client with a new multi_addr transport
636 * Returns zero on success, otherwise -EINVAL
638 * Note: since the exchange_id for the new multi_addr transport uses the
639 * same nfs_client from the original mount, the cl_owner_id is reused,
640 * so eir_clientowner is the same.
642 int nfs4_detect_session_trunking(struct nfs_client *clp,
643 struct nfs41_exchange_id_res *res,
644 struct rpc_xprt *xprt)
646 /* Check eir_clientid */
647 if (clp->cl_clientid != res->clientid)
650 /* Check eir_server_owner so_major_id */
651 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner,
655 /* Check eir_server_owner so_minor_id */
656 if (clp->cl_serverowner->minor_id != res->server_owner->minor_id)
659 /* Check eir_server_scope */
660 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope))
663 pr_info("NFS: %s: Session trunking succeeded for %s\n",
665 xprt->address_strings[RPC_DISPLAY_ADDR]);
669 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname,
670 xprt->address_strings[RPC_DISPLAY_ADDR]);
676 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
678 * @new: nfs_client with client ID to test
679 * @result: OUT: found nfs_client, or new
680 * @cred: credential to use for trunking test
682 * Returns zero, a negative errno, or a negative NFS4ERR status.
683 * If zero is returned, an nfs_client pointer is planted in "result."
685 * NB: nfs41_walk_client_list() relies on the new nfs_client being
686 * the last nfs_client on the list.
688 int nfs41_walk_client_list(struct nfs_client *new,
689 struct nfs_client **result,
690 struct rpc_cred *cred)
692 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
693 struct nfs_client *pos, *prev = NULL;
694 int status = -NFS4ERR_STALE_CLIENTID;
696 spin_lock(&nn->nfs_client_lock);
697 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
702 status = nfs4_match_client(pos, new, &prev, nn);
709 * Note that session trunking is just a special subcase of
710 * client id trunking. In either case, we want to fall back
711 * to using the existing nfs_client.
713 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner,
714 new->cl_serverowner))
718 atomic_inc(&pos->cl_count);
725 spin_unlock(&nn->nfs_client_lock);
726 nfs_put_client(prev);
729 #endif /* CONFIG_NFS_V4_1 */
731 static void nfs4_destroy_server(struct nfs_server *server)
733 nfs_server_return_all_delegations(server);
734 unset_pnfs_layoutdriver(server);
735 nfs4_purge_state_owners(server);
739 * NFSv4.0 callback thread helper
741 * Find a client by callback identifier
744 nfs4_find_client_ident(struct net *net, int cb_ident)
746 struct nfs_client *clp;
747 struct nfs_net *nn = net_generic(net, nfs_net_id);
749 spin_lock(&nn->nfs_client_lock);
750 clp = idr_find(&nn->cb_ident_idr, cb_ident);
752 atomic_inc(&clp->cl_count);
753 spin_unlock(&nn->nfs_client_lock);
757 #if defined(CONFIG_NFS_V4_1)
758 /* Common match routine for v4.0 and v4.1 callback services */
759 static bool nfs4_cb_match_client(const struct sockaddr *addr,
760 struct nfs_client *clp, u32 minorversion)
762 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
764 /* Don't match clients that failed to initialise */
765 if (!(clp->cl_cons_state == NFS_CS_READY ||
766 clp->cl_cons_state == NFS_CS_SESSION_INITING))
771 /* Match the version and minorversion */
772 if (clp->rpc_ops->version != 4 ||
773 clp->cl_minorversion != minorversion)
776 /* Match only the IP address, not the port number */
777 return rpc_cmp_addr(addr, clap);
781 * NFSv4.1 callback thread helper
782 * For CB_COMPOUND calls, find a client by IP address, protocol version,
783 * minorversion, and sessionID
785 * Returns NULL if no such client
788 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
789 struct nfs4_sessionid *sid, u32 minorversion)
791 struct nfs_client *clp;
792 struct nfs_net *nn = net_generic(net, nfs_net_id);
794 spin_lock(&nn->nfs_client_lock);
795 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
796 if (nfs4_cb_match_client(addr, clp, minorversion) == false)
799 if (!nfs4_has_session(clp))
803 if (memcmp(clp->cl_session->sess_id.data,
804 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
807 atomic_inc(&clp->cl_count);
808 spin_unlock(&nn->nfs_client_lock);
811 spin_unlock(&nn->nfs_client_lock);
815 #else /* CONFIG_NFS_V4_1 */
818 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
819 struct nfs4_sessionid *sid, u32 minorversion)
823 #endif /* CONFIG_NFS_V4_1 */
826 * Set up an NFS4 client
828 static int nfs4_set_client(struct nfs_server *server,
829 const char *hostname,
830 const struct sockaddr *addr,
831 const size_t addrlen,
833 int proto, const struct rpc_timeout *timeparms,
834 u32 minorversion, struct net *net)
836 struct nfs_client_initdata cl_init = {
837 .hostname = hostname,
843 .minorversion = minorversion,
845 .timeparms = timeparms,
847 struct nfs_client *clp;
849 if (server->flags & NFS_MOUNT_NORESVPORT)
850 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
851 if (server->options & NFS_OPTION_MIGRATION)
852 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
853 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status))
854 set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags);
856 /* Allocate or find a client reference we can use */
857 clp = nfs_get_client(&cl_init);
861 if (server->nfs_client == clp)
865 * Query for the lease time on clientid setup or renewal
867 * Note that this will be set on nfs_clients that were created
868 * only for the DS role and did not set this bit, but now will
871 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
873 server->nfs_client = clp;
878 * Set up a pNFS Data Server client.
880 * Return any existing nfs_client that matches server address,port,version
883 * For a new nfs_client, use a soft mount (default), a low retrans and a
884 * low timeout interval so that if a connection is lost, we retry through
887 struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
888 const struct sockaddr *ds_addr, int ds_addrlen,
889 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
892 struct rpc_timeout ds_timeout;
893 struct nfs_client *mds_clp = mds_srv->nfs_client;
894 struct nfs_client_initdata cl_init = {
896 .addrlen = ds_addrlen,
897 .nodename = mds_clp->cl_rpcclient->cl_nodename,
898 .ip_addr = mds_clp->cl_ipaddr,
901 .minorversion = minor_version,
902 .net = mds_clp->cl_net,
903 .timeparms = &ds_timeout,
905 char buf[INET6_ADDRSTRLEN + 1];
907 if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
908 return ERR_PTR(-EINVAL);
909 cl_init.hostname = buf;
911 if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
912 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
915 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
916 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
917 * (section 13.1 RFC 5661).
919 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
920 return nfs_get_client(&cl_init);
922 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
925 * Session has been established, and the client marked ready.
926 * Set the mount rsize and wsize with negotiated fore channel
927 * attributes which will be bound checked in nfs_server_set_fsinfo.
929 static void nfs4_session_set_rwsize(struct nfs_server *server)
931 #ifdef CONFIG_NFS_V4_1
932 struct nfs4_session *sess;
936 if (!nfs4_has_session(server->nfs_client))
938 sess = server->nfs_client->cl_session;
939 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
940 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
942 if (!server->rsize || server->rsize > server_resp_sz)
943 server->rsize = server_resp_sz;
944 if (!server->wsize || server->wsize > server_rqst_sz)
945 server->wsize = server_rqst_sz;
946 #endif /* CONFIG_NFS_V4_1 */
949 static int nfs4_server_common_setup(struct nfs_server *server,
950 struct nfs_fh *mntfh, bool auth_probe)
952 struct nfs_fattr *fattr;
955 /* data servers support only a subset of NFSv4.1 */
956 if (is_ds_only_client(server->nfs_client))
957 return -EPROTONOSUPPORT;
959 fattr = nfs_alloc_fattr();
963 /* We must ensure the session is initialised first */
964 error = nfs4_init_session(server->nfs_client);
968 /* Set the basic capabilities */
969 server->caps |= server->nfs_client->cl_mvops->init_caps;
970 if (server->flags & NFS_MOUNT_NORDIRPLUS)
971 server->caps &= ~NFS_CAP_READDIRPLUS;
973 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
976 if (nfs4_disable_idmapping &&
977 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
978 server->caps |= NFS_CAP_UIDGID_NOMAP;
981 /* Probe the root fh to retrieve its FSID and filehandle */
982 error = nfs4_get_rootfh(server, mntfh, auth_probe);
986 dprintk("Server FSID: %llx:%llx\n",
987 (unsigned long long) server->fsid.major,
988 (unsigned long long) server->fsid.minor);
989 nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
991 nfs4_session_set_rwsize(server);
993 error = nfs_probe_fsinfo(server, mntfh, fattr);
997 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
998 server->namelen = NFS4_MAXNAMLEN;
1000 nfs_server_insert_lists(server);
1001 server->mount_time = jiffies;
1002 server->destroy = nfs4_destroy_server;
1004 nfs_free_fattr(fattr);
1009 * Create a version 4 volume record
1011 static int nfs4_init_server(struct nfs_server *server,
1012 struct nfs_parsed_mount_data *data)
1014 struct rpc_timeout timeparms;
1017 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1018 data->timeo, data->retrans);
1020 /* Initialise the client representation from the mount data */
1021 server->flags = data->flags;
1022 server->options = data->options;
1023 server->auth_info = data->auth_info;
1025 /* Use the first specified auth flavor. If this flavor isn't
1026 * allowed by the server, use the SECINFO path to try the
1027 * other specified flavors */
1028 if (data->auth_info.flavor_len >= 1)
1029 data->selected_flavor = data->auth_info.flavors[0];
1031 data->selected_flavor = RPC_AUTH_UNIX;
1033 /* Get a client record */
1034 error = nfs4_set_client(server,
1035 data->nfs_server.hostname,
1036 (const struct sockaddr *)&data->nfs_server.address,
1037 data->nfs_server.addrlen,
1038 data->client_address,
1039 data->nfs_server.protocol,
1047 server->rsize = nfs_block_size(data->rsize, NULL);
1049 server->wsize = nfs_block_size(data->wsize, NULL);
1051 server->acregmin = data->acregmin * HZ;
1052 server->acregmax = data->acregmax * HZ;
1053 server->acdirmin = data->acdirmin * HZ;
1054 server->acdirmax = data->acdirmax * HZ;
1055 server->port = data->nfs_server.port;
1057 return nfs_init_server_rpcclient(server, &timeparms,
1058 data->selected_flavor);
1062 * Create a version 4 volume record
1063 * - keyed on server and FSID
1065 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1066 struct nfs_fh *mntfh)*/
1067 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
1068 struct nfs_subversion *nfs_mod)
1070 struct nfs_server *server;
1074 server = nfs_alloc_server();
1076 return ERR_PTR(-ENOMEM);
1078 auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
1080 /* set up the general RPC client */
1081 error = nfs4_init_server(server, mount_info->parsed);
1085 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
1092 nfs_free_server(server);
1093 return ERR_PTR(error);
1097 * Create an NFS4 referral server record
1099 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1100 struct nfs_fh *mntfh)
1102 struct nfs_client *parent_client;
1103 struct nfs_server *server, *parent_server;
1107 server = nfs_alloc_server();
1109 return ERR_PTR(-ENOMEM);
1111 parent_server = NFS_SB(data->sb);
1112 parent_client = parent_server->nfs_client;
1114 /* Initialise the client representation from the parent server */
1115 nfs_server_copy_userdata(server, parent_server);
1117 /* Get a client representation.
1118 * Note: NFSv4 always uses TCP, */
1119 error = nfs4_set_client(server, data->hostname,
1122 parent_client->cl_ipaddr,
1123 rpc_protocol(parent_server->client),
1124 parent_server->client->cl_timeout,
1125 parent_client->cl_mvops->minor_version,
1126 parent_client->cl_net);
1130 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1134 auth_probe = parent_server->auth_info.flavor_len < 1;
1136 error = nfs4_server_common_setup(server, mntfh, auth_probe);
1143 nfs_free_server(server);
1144 return ERR_PTR(error);
1148 * Grab the destination's particulars, including lease expiry time.
1150 * Returns zero if probe succeeded and retrieved FSID matches the FSID
1153 static int nfs_probe_destination(struct nfs_server *server)
1155 struct inode *inode = d_inode(server->super->s_root);
1156 struct nfs_fattr *fattr;
1159 fattr = nfs_alloc_fattr();
1163 /* Sanity: the probe won't work if the destination server
1164 * does not recognize the migrated FH. */
1165 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1167 nfs_free_fattr(fattr);
1172 * nfs4_update_server - Move an nfs_server to a different nfs_client
1174 * @server: represents FSID to be moved
1175 * @hostname: new end-point's hostname
1176 * @sap: new end-point's socket address
1177 * @salen: size of "sap"
1178 * @net: net namespace
1180 * The nfs_server must be quiescent before this function is invoked.
1181 * Either its session is drained (NFSv4.1+), or its transport is
1182 * plugged and drained (NFSv4.0).
1184 * Returns zero on success, or a negative errno value.
1186 int nfs4_update_server(struct nfs_server *server, const char *hostname,
1187 struct sockaddr *sap, size_t salen, struct net *net)
1189 struct nfs_client *clp = server->nfs_client;
1190 struct rpc_clnt *clnt = server->client;
1191 struct xprt_create xargs = {
1192 .ident = clp->cl_proto,
1196 .servername = hostname,
1198 char buf[INET6_ADDRSTRLEN + 1];
1199 struct sockaddr_storage address;
1200 struct sockaddr *localaddr = (struct sockaddr *)&address;
1203 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1207 error = rpc_localaddr(clnt, localaddr, sizeof(address));
1211 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0)
1212 return -EAFNOSUPPORT;
1214 nfs_server_remove_lists(server);
1215 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1216 error = nfs4_set_client(server, hostname, sap, salen, buf,
1217 clp->cl_proto, clnt->cl_timeout,
1218 clp->cl_minorversion, net);
1219 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1220 nfs_put_client(clp);
1222 nfs_server_insert_lists(server);
1226 if (server->nfs_client->cl_hostname == NULL)
1227 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1228 nfs_server_insert_lists(server);
1230 return nfs_probe_destination(server);