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);
160 nfs4_cleanup_callback(struct nfs_client *clp)
162 struct nfs4_copy_state *cp_state;
164 while (!list_empty(&clp->pending_cb_stateids)) {
165 cp_state = list_entry(clp->pending_cb_stateids.next,
166 struct nfs4_copy_state, copies);
167 list_del(&cp_state->copies);
172 void nfs41_shutdown_client(struct nfs_client *clp)
174 if (nfs4_has_session(clp)) {
175 nfs4_cleanup_callback(clp);
176 nfs4_shutdown_ds_clients(clp);
177 nfs4_destroy_session(clp->cl_session);
178 nfs4_destroy_clientid(clp);
182 #endif /* CONFIG_NFS_V4_1 */
184 void nfs40_shutdown_client(struct nfs_client *clp)
186 if (clp->cl_slot_tbl) {
187 nfs4_shutdown_slot_table(clp->cl_slot_tbl);
188 kfree(clp->cl_slot_tbl);
192 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
194 char buf[INET6_ADDRSTRLEN + 1];
195 const char *ip_addr = cl_init->ip_addr;
196 struct nfs_client *clp = nfs_alloc_client(cl_init);
202 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
206 if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
211 spin_lock_init(&clp->cl_lock);
212 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
213 INIT_LIST_HEAD(&clp->cl_ds_clients);
214 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
215 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
216 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
218 #if IS_ENABLED(CONFIG_NFS_V4_1)
219 init_waitqueue_head(&clp->cl_lock_waitq);
221 INIT_LIST_HEAD(&clp->pending_cb_stateids);
223 if (cl_init->minorversion != 0)
224 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
225 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
226 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
229 * Set up the connection to the server before we add add to the
232 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
234 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
238 /* If no clientaddr= option was specified, find a usable cb address */
239 if (ip_addr == NULL) {
240 struct sockaddr_storage cb_addr;
241 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
243 err = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
246 err = rpc_ntop(sap, buf, sizeof(buf));
249 ip_addr = (const char *)buf;
251 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
253 err = nfs_idmap_new(clp);
255 dprintk("%s: failed to create idmapper. Error = %d\n",
259 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
263 nfs_free_client(clp);
268 * Destroy the NFS4 callback service
270 static void nfs4_destroy_callback(struct nfs_client *clp)
272 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
273 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
276 static void nfs4_shutdown_client(struct nfs_client *clp)
278 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
279 nfs4_kill_renewd(clp);
280 clp->cl_mvops->shutdown_client(clp);
281 nfs4_destroy_callback(clp);
282 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
283 nfs_idmap_delete(clp);
285 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
286 kfree(clp->cl_serverowner);
287 kfree(clp->cl_serverscope);
288 kfree(clp->cl_implid);
289 kfree(clp->cl_owner_id);
292 void nfs4_free_client(struct nfs_client *clp)
294 nfs4_shutdown_client(clp);
295 nfs_free_client(clp);
299 * Initialize the NFS4 callback service
301 static int nfs4_init_callback(struct nfs_client *clp)
303 struct rpc_xprt *xprt;
306 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
308 if (nfs4_has_session(clp)) {
309 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
314 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
316 dprintk("%s: failed to start callback. Error = %d\n",
320 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
326 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
327 * @clp - nfs_client to initialize
329 * Returns zero on success, or a negative errno if some error occurred.
331 int nfs40_init_client(struct nfs_client *clp)
333 struct nfs4_slot_table *tbl;
336 tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
340 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
341 "NFSv4.0 transport Slot table");
343 nfs4_shutdown_slot_table(tbl);
348 clp->cl_slot_tbl = tbl;
352 #if defined(CONFIG_NFS_V4_1)
355 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
356 * @clp - nfs_client to initialize
358 * Returns zero on success, or a negative errno if some error occurred.
360 int nfs41_init_client(struct nfs_client *clp)
362 struct nfs4_session *session = NULL;
365 * Create the session and mark it expired.
366 * When a SEQUENCE operation encounters the expired session
367 * it will do session recovery to initialize it.
369 session = nfs4_alloc_session(clp);
373 clp->cl_session = session;
376 * The create session reply races with the server back
377 * channel probe. Mark the client NFS_CS_SESSION_INITING
378 * so that the client back channel can find the
381 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
385 #endif /* CONFIG_NFS_V4_1 */
388 * Initialize the minor version specific parts of an NFS4 client record
390 static int nfs4_init_client_minor_version(struct nfs_client *clp)
394 ret = clp->cl_mvops->init_client(clp);
397 return nfs4_init_callback(clp);
401 * nfs4_init_client - Initialise an NFS4 client record
403 * @clp: nfs_client to initialise
404 * @timeparms: timeout parameters for underlying RPC transport
405 * @ip_addr: callback IP address in presentation format
406 * @authflavor: authentication flavor for underlying RPC transport
408 * Returns pointer to an NFS client, or an ERR_PTR value.
410 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
411 const struct nfs_client_initdata *cl_init)
413 struct nfs_client *old;
416 if (clp->cl_cons_state == NFS_CS_READY)
417 /* the client is initialised already */
420 error = nfs4_init_client_minor_version(clp);
424 error = nfs4_discover_server_trunking(clp, &old);
429 clp->cl_preserve_clid = true;
431 * Mark the client as having failed initialization so other
432 * processes walking the nfs_client_list in nfs_match_client()
433 * won't try to use it.
435 nfs_mark_client_ready(clp, -EPERM);
437 clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags);
442 nfs_mark_client_ready(clp, error);
444 return ERR_PTR(error);
448 * SETCLIENTID just did a callback update with the callback ident in
449 * "drop," but server trunking discovery claims "drop" and "keep" are
450 * actually the same server. Swap the callback IDs so that "keep"
451 * will continue to use the callback ident the server now knows about,
452 * and so that "keep"'s original callback ident is destroyed when
455 static void nfs4_swap_callback_idents(struct nfs_client *keep,
456 struct nfs_client *drop)
458 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
459 unsigned int save = keep->cl_cb_ident;
461 if (keep->cl_cb_ident == drop->cl_cb_ident)
464 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
465 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
467 spin_lock(&nn->nfs_client_lock);
469 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
470 keep->cl_cb_ident = drop->cl_cb_ident;
472 idr_replace(&nn->cb_ident_idr, drop, save);
473 drop->cl_cb_ident = save;
475 spin_unlock(&nn->nfs_client_lock);
478 static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
479 const struct nfs_client *clp2)
481 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
483 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
486 static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2)
488 return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0;
491 static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new,
492 struct nfs_client **prev, struct nfs_net *nn)
496 if (pos->rpc_ops != new->rpc_ops)
499 if (pos->cl_minorversion != new->cl_minorversion)
502 /* If "pos" isn't marked ready, we can't trust the
503 * remaining fields in "pos", especially the client
504 * ID and serverowner fields. Wait for CREATE_SESSION
506 if (pos->cl_cons_state > NFS_CS_READY) {
507 refcount_inc(&pos->cl_count);
508 spin_unlock(&nn->nfs_client_lock);
510 nfs_put_client(*prev);
513 status = nfs_wait_client_init_complete(pos);
514 spin_lock(&nn->nfs_client_lock);
520 if (pos->cl_cons_state != NFS_CS_READY)
523 if (pos->cl_clientid != new->cl_clientid)
526 /* NFSv4.1 always uses the uniform string, however someone
527 * might switch the uniquifier string on us.
529 if (!nfs4_match_client_owner_id(pos, new))
536 * nfs40_walk_client_list - Find server that recognizes a client ID
538 * @new: nfs_client with client ID to test
539 * @result: OUT: found nfs_client, or new
540 * @cred: credential to use for trunking test
542 * Returns zero, a negative errno, or a negative NFS4ERR status.
543 * If zero is returned, an nfs_client pointer is planted in "result."
545 * NB: nfs40_walk_client_list() relies on the new nfs_client being
546 * the last nfs_client on the list.
548 int nfs40_walk_client_list(struct nfs_client *new,
549 struct nfs_client **result,
550 struct rpc_cred *cred)
552 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
553 struct nfs_client *pos, *prev = NULL;
554 struct nfs4_setclientid_res clid = {
555 .clientid = new->cl_clientid,
556 .confirm = new->cl_confirm,
558 int status = -NFS4ERR_STALE_CLIENTID;
560 spin_lock(&nn->nfs_client_lock);
561 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
566 status = nfs4_match_client(pos, new, &prev, nn);
572 * We just sent a new SETCLIENTID, which should have
573 * caused the server to return a new cl_confirm. So if
574 * cl_confirm is the same, then this is a different
575 * server that just returned the same cl_confirm by
578 if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm,
582 * But if the cl_confirm's are different, then the only
583 * way that a SETCLIENTID_CONFIRM to pos can succeed is
584 * if new and pos point to the same server:
587 refcount_inc(&pos->cl_count);
588 spin_unlock(&nn->nfs_client_lock);
590 nfs_put_client(prev);
593 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
595 case -NFS4ERR_STALE_CLIENTID:
598 nfs4_swap_callback_idents(pos, new);
599 pos->cl_confirm = new->cl_confirm;
600 nfs_mark_client_ready(pos, NFS_CS_READY);
607 /* The callback path may have been inadvertently
608 * changed. Schedule recovery!
610 nfs4_schedule_path_down_recovery(pos);
615 spin_lock(&nn->nfs_client_lock);
618 spin_unlock(&nn->nfs_client_lock);
620 /* No match found. The server lost our clientid */
622 nfs_put_client(prev);
626 #ifdef CONFIG_NFS_V4_1
628 * Returns true if the server major ids match
631 nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
632 struct nfs41_server_owner *o2)
634 if (o1->major_id_sz != o2->major_id_sz)
636 return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0;
640 * Returns true if the server scopes match
643 nfs4_check_server_scope(struct nfs41_server_scope *s1,
644 struct nfs41_server_scope *s2)
646 if (s1->server_scope_sz != s2->server_scope_sz)
648 return memcmp(s1->server_scope, s2->server_scope,
649 s1->server_scope_sz) == 0;
653 * nfs4_detect_session_trunking - Checks for session trunking.
655 * Called after a successful EXCHANGE_ID on a multi-addr connection.
656 * Upon success, add the transport.
658 * @clp: original mount nfs_client
659 * @res: result structure from an exchange_id using the original mount
660 * nfs_client with a new multi_addr transport
662 * Returns zero on success, otherwise -EINVAL
664 * Note: since the exchange_id for the new multi_addr transport uses the
665 * same nfs_client from the original mount, the cl_owner_id is reused,
666 * so eir_clientowner is the same.
668 int nfs4_detect_session_trunking(struct nfs_client *clp,
669 struct nfs41_exchange_id_res *res,
670 struct rpc_xprt *xprt)
672 /* Check eir_clientid */
673 if (clp->cl_clientid != res->clientid)
676 /* Check eir_server_owner so_major_id */
677 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner,
681 /* Check eir_server_owner so_minor_id */
682 if (clp->cl_serverowner->minor_id != res->server_owner->minor_id)
685 /* Check eir_server_scope */
686 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope))
689 pr_info("NFS: %s: Session trunking succeeded for %s\n",
691 xprt->address_strings[RPC_DISPLAY_ADDR]);
695 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname,
696 xprt->address_strings[RPC_DISPLAY_ADDR]);
702 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
704 * @new: nfs_client with client ID to test
705 * @result: OUT: found nfs_client, or new
706 * @cred: credential to use for trunking test
708 * Returns zero, a negative errno, or a negative NFS4ERR status.
709 * If zero is returned, an nfs_client pointer is planted in "result."
711 * NB: nfs41_walk_client_list() relies on the new nfs_client being
712 * the last nfs_client on the list.
714 int nfs41_walk_client_list(struct nfs_client *new,
715 struct nfs_client **result,
716 struct rpc_cred *cred)
718 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
719 struct nfs_client *pos, *prev = NULL;
720 int status = -NFS4ERR_STALE_CLIENTID;
722 spin_lock(&nn->nfs_client_lock);
723 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
728 status = nfs4_match_client(pos, new, &prev, nn);
735 * Note that session trunking is just a special subcase of
736 * client id trunking. In either case, we want to fall back
737 * to using the existing nfs_client.
739 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner,
740 new->cl_serverowner))
744 refcount_inc(&pos->cl_count);
751 spin_unlock(&nn->nfs_client_lock);
752 nfs_put_client(prev);
755 #endif /* CONFIG_NFS_V4_1 */
757 static void nfs4_destroy_server(struct nfs_server *server)
761 nfs_server_return_all_delegations(server);
762 unset_pnfs_layoutdriver(server);
763 nfs4_purge_state_owners(server, &freeme);
764 nfs4_free_state_owners(&freeme);
768 * NFSv4.0 callback thread helper
770 * Find a client by callback identifier
773 nfs4_find_client_ident(struct net *net, int cb_ident)
775 struct nfs_client *clp;
776 struct nfs_net *nn = net_generic(net, nfs_net_id);
778 spin_lock(&nn->nfs_client_lock);
779 clp = idr_find(&nn->cb_ident_idr, cb_ident);
781 refcount_inc(&clp->cl_count);
782 spin_unlock(&nn->nfs_client_lock);
786 #if defined(CONFIG_NFS_V4_1)
787 /* Common match routine for v4.0 and v4.1 callback services */
788 static bool nfs4_cb_match_client(const struct sockaddr *addr,
789 struct nfs_client *clp, u32 minorversion)
791 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
793 /* Don't match clients that failed to initialise */
794 if (!(clp->cl_cons_state == NFS_CS_READY ||
795 clp->cl_cons_state == NFS_CS_SESSION_INITING))
800 /* Match the version and minorversion */
801 if (clp->rpc_ops->version != 4 ||
802 clp->cl_minorversion != minorversion)
805 /* Match only the IP address, not the port number */
806 return rpc_cmp_addr(addr, clap);
810 * NFSv4.1 callback thread helper
811 * For CB_COMPOUND calls, find a client by IP address, protocol version,
812 * minorversion, and sessionID
814 * Returns NULL if no such client
817 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
818 struct nfs4_sessionid *sid, u32 minorversion)
820 struct nfs_client *clp;
821 struct nfs_net *nn = net_generic(net, nfs_net_id);
823 spin_lock(&nn->nfs_client_lock);
824 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
825 if (!nfs4_cb_match_client(addr, clp, minorversion))
828 if (!nfs4_has_session(clp))
832 if (memcmp(clp->cl_session->sess_id.data,
833 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
836 refcount_inc(&clp->cl_count);
837 spin_unlock(&nn->nfs_client_lock);
840 spin_unlock(&nn->nfs_client_lock);
844 #else /* CONFIG_NFS_V4_1 */
847 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
848 struct nfs4_sessionid *sid, u32 minorversion)
852 #endif /* CONFIG_NFS_V4_1 */
855 * Set up an NFS4 client
857 static int nfs4_set_client(struct nfs_server *server,
858 const char *hostname,
859 const struct sockaddr *addr,
860 const size_t addrlen,
862 int proto, const struct rpc_timeout *timeparms,
863 u32 minorversion, struct net *net)
865 struct nfs_client_initdata cl_init = {
866 .hostname = hostname,
872 .minorversion = minorversion,
874 .timeparms = timeparms,
876 struct nfs_client *clp;
878 if (server->flags & NFS_MOUNT_NORESVPORT)
879 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
880 if (server->options & NFS_OPTION_MIGRATION)
881 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
882 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status))
883 set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags);
884 server->port = rpc_get_port(addr);
886 /* Allocate or find a client reference we can use */
887 clp = nfs_get_client(&cl_init);
891 if (server->nfs_client == clp) {
897 * Query for the lease time on clientid setup or renewal
899 * Note that this will be set on nfs_clients that were created
900 * only for the DS role and did not set this bit, but now will
903 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
905 server->nfs_client = clp;
910 * Set up a pNFS Data Server client.
912 * Return any existing nfs_client that matches server address,port,version
915 * For a new nfs_client, use a soft mount (default), a low retrans and a
916 * low timeout interval so that if a connection is lost, we retry through
919 struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
920 const struct sockaddr *ds_addr, int ds_addrlen,
921 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
924 struct rpc_timeout ds_timeout;
925 struct nfs_client *mds_clp = mds_srv->nfs_client;
926 struct nfs_client_initdata cl_init = {
928 .addrlen = ds_addrlen,
929 .nodename = mds_clp->cl_rpcclient->cl_nodename,
930 .ip_addr = mds_clp->cl_ipaddr,
933 .minorversion = minor_version,
934 .net = mds_clp->cl_net,
935 .timeparms = &ds_timeout,
937 char buf[INET6_ADDRSTRLEN + 1];
939 if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
940 return ERR_PTR(-EINVAL);
941 cl_init.hostname = buf;
943 if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
944 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
947 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
948 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
949 * (section 13.1 RFC 5661).
951 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
952 return nfs_get_client(&cl_init);
954 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
957 * Session has been established, and the client marked ready.
958 * Limit the mount rsize, wsize and dtsize using negotiated fore
959 * channel attributes.
961 static void nfs4_session_limit_rwsize(struct nfs_server *server)
963 #ifdef CONFIG_NFS_V4_1
964 struct nfs4_session *sess;
968 if (!nfs4_has_session(server->nfs_client))
970 sess = server->nfs_client->cl_session;
971 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
972 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
974 if (server->dtsize > server_resp_sz)
975 server->dtsize = server_resp_sz;
976 if (server->rsize > server_resp_sz)
977 server->rsize = server_resp_sz;
978 if (server->wsize > server_rqst_sz)
979 server->wsize = server_rqst_sz;
980 #endif /* CONFIG_NFS_V4_1 */
983 static int nfs4_server_common_setup(struct nfs_server *server,
984 struct nfs_fh *mntfh, bool auth_probe)
986 struct nfs_fattr *fattr;
989 /* data servers support only a subset of NFSv4.1 */
990 if (is_ds_only_client(server->nfs_client))
991 return -EPROTONOSUPPORT;
993 fattr = nfs_alloc_fattr();
997 /* We must ensure the session is initialised first */
998 error = nfs4_init_session(server->nfs_client);
1002 /* Set the basic capabilities */
1003 server->caps |= server->nfs_client->cl_mvops->init_caps;
1004 if (server->flags & NFS_MOUNT_NORDIRPLUS)
1005 server->caps &= ~NFS_CAP_READDIRPLUS;
1007 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
1010 if (nfs4_disable_idmapping &&
1011 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
1012 server->caps |= NFS_CAP_UIDGID_NOMAP;
1015 /* Probe the root fh to retrieve its FSID and filehandle */
1016 error = nfs4_get_rootfh(server, mntfh, auth_probe);
1020 dprintk("Server FSID: %llx:%llx\n",
1021 (unsigned long long) server->fsid.major,
1022 (unsigned long long) server->fsid.minor);
1023 nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
1025 error = nfs_probe_fsinfo(server, mntfh, fattr);
1029 nfs4_session_limit_rwsize(server);
1031 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1032 server->namelen = NFS4_MAXNAMLEN;
1034 nfs_server_insert_lists(server);
1035 server->mount_time = jiffies;
1036 server->destroy = nfs4_destroy_server;
1038 nfs_free_fattr(fattr);
1043 * Create a version 4 volume record
1045 static int nfs4_init_server(struct nfs_server *server,
1046 struct nfs_parsed_mount_data *data)
1048 struct rpc_timeout timeparms;
1051 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1052 data->timeo, data->retrans);
1054 /* Initialise the client representation from the mount data */
1055 server->flags = data->flags;
1056 server->options = data->options;
1057 server->auth_info = data->auth_info;
1059 /* Use the first specified auth flavor. If this flavor isn't
1060 * allowed by the server, use the SECINFO path to try the
1061 * other specified flavors */
1062 if (data->auth_info.flavor_len >= 1)
1063 data->selected_flavor = data->auth_info.flavors[0];
1065 data->selected_flavor = RPC_AUTH_UNIX;
1067 /* Get a client record */
1068 error = nfs4_set_client(server,
1069 data->nfs_server.hostname,
1070 (const struct sockaddr *)&data->nfs_server.address,
1071 data->nfs_server.addrlen,
1072 data->client_address,
1073 data->nfs_server.protocol,
1081 server->rsize = nfs_block_size(data->rsize, NULL);
1083 server->wsize = nfs_block_size(data->wsize, NULL);
1085 server->acregmin = data->acregmin * HZ;
1086 server->acregmax = data->acregmax * HZ;
1087 server->acdirmin = data->acdirmin * HZ;
1088 server->acdirmax = data->acdirmax * HZ;
1089 server->port = data->nfs_server.port;
1091 return nfs_init_server_rpcclient(server, &timeparms,
1092 data->selected_flavor);
1096 * Create a version 4 volume record
1097 * - keyed on server and FSID
1099 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1100 struct nfs_fh *mntfh)*/
1101 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
1102 struct nfs_subversion *nfs_mod)
1104 struct nfs_server *server;
1108 server = nfs_alloc_server();
1110 return ERR_PTR(-ENOMEM);
1112 auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
1114 /* set up the general RPC client */
1115 error = nfs4_init_server(server, mount_info->parsed);
1119 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
1126 nfs_free_server(server);
1127 return ERR_PTR(error);
1131 * Create an NFS4 referral server record
1133 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1134 struct nfs_fh *mntfh)
1136 struct nfs_client *parent_client;
1137 struct nfs_server *server, *parent_server;
1141 server = nfs_alloc_server();
1143 return ERR_PTR(-ENOMEM);
1145 parent_server = NFS_SB(data->sb);
1146 parent_client = parent_server->nfs_client;
1148 /* Initialise the client representation from the parent server */
1149 nfs_server_copy_userdata(server, parent_server);
1151 /* Get a client representation */
1152 #if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA)
1153 rpc_set_port(data->addr, NFS_RDMA_PORT);
1154 error = nfs4_set_client(server, data->hostname,
1157 parent_client->cl_ipaddr,
1158 XPRT_TRANSPORT_RDMA,
1159 parent_server->client->cl_timeout,
1160 parent_client->cl_mvops->minor_version,
1161 parent_client->cl_net);
1164 #endif /* IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) */
1166 rpc_set_port(data->addr, NFS_PORT);
1167 error = nfs4_set_client(server, data->hostname,
1170 parent_client->cl_ipaddr,
1172 parent_server->client->cl_timeout,
1173 parent_client->cl_mvops->minor_version,
1174 parent_client->cl_net);
1178 #if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA)
1181 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1185 auth_probe = parent_server->auth_info.flavor_len < 1;
1187 error = nfs4_server_common_setup(server, mntfh, auth_probe);
1194 nfs_free_server(server);
1195 return ERR_PTR(error);
1199 * Grab the destination's particulars, including lease expiry time.
1201 * Returns zero if probe succeeded and retrieved FSID matches the FSID
1204 static int nfs_probe_destination(struct nfs_server *server)
1206 struct inode *inode = d_inode(server->super->s_root);
1207 struct nfs_fattr *fattr;
1210 fattr = nfs_alloc_fattr();
1214 /* Sanity: the probe won't work if the destination server
1215 * does not recognize the migrated FH. */
1216 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1218 nfs_free_fattr(fattr);
1223 * nfs4_update_server - Move an nfs_server to a different nfs_client
1225 * @server: represents FSID to be moved
1226 * @hostname: new end-point's hostname
1227 * @sap: new end-point's socket address
1228 * @salen: size of "sap"
1229 * @net: net namespace
1231 * The nfs_server must be quiescent before this function is invoked.
1232 * Either its session is drained (NFSv4.1+), or its transport is
1233 * plugged and drained (NFSv4.0).
1235 * Returns zero on success, or a negative errno value.
1237 int nfs4_update_server(struct nfs_server *server, const char *hostname,
1238 struct sockaddr *sap, size_t salen, struct net *net)
1240 struct nfs_client *clp = server->nfs_client;
1241 struct rpc_clnt *clnt = server->client;
1242 struct xprt_create xargs = {
1243 .ident = clp->cl_proto,
1247 .servername = hostname,
1249 char buf[INET6_ADDRSTRLEN + 1];
1250 struct sockaddr_storage address;
1251 struct sockaddr *localaddr = (struct sockaddr *)&address;
1254 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1258 error = rpc_localaddr(clnt, localaddr, sizeof(address));
1262 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0)
1263 return -EAFNOSUPPORT;
1265 nfs_server_remove_lists(server);
1266 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1267 error = nfs4_set_client(server, hostname, sap, salen, buf,
1268 clp->cl_proto, clnt->cl_timeout,
1269 clp->cl_minorversion, net);
1270 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1272 nfs_server_insert_lists(server);
1275 nfs_put_client(clp);
1277 if (server->nfs_client->cl_hostname == NULL) {
1278 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1279 if (server->nfs_client->cl_hostname == NULL)
1282 nfs_server_insert_lists(server);
1284 return nfs_probe_destination(server);