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, 0, 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);
231 kfree(clp->cl_owner_id);
234 void nfs4_free_client(struct nfs_client *clp)
236 nfs4_shutdown_client(clp);
237 nfs_free_client(clp);
241 * Initialize the NFS4 callback service
243 static int nfs4_init_callback(struct nfs_client *clp)
245 struct rpc_xprt *xprt;
248 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
250 if (nfs4_has_session(clp)) {
251 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
256 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
258 dprintk("%s: failed to start callback. Error = %d\n",
262 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
268 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
269 * @clp - nfs_client to initialize
271 * Returns zero on success, or a negative errno if some error occurred.
273 int nfs40_init_client(struct nfs_client *clp)
275 struct nfs4_slot_table *tbl;
278 tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
282 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
283 "NFSv4.0 transport Slot table");
289 clp->cl_slot_tbl = tbl;
293 #if defined(CONFIG_NFS_V4_1)
296 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
297 * @clp - nfs_client to initialize
299 * Returns zero on success, or a negative errno if some error occurred.
301 int nfs41_init_client(struct nfs_client *clp)
303 struct nfs4_session *session = NULL;
306 * Create the session and mark it expired.
307 * When a SEQUENCE operation encounters the expired session
308 * it will do session recovery to initialize it.
310 session = nfs4_alloc_session(clp);
314 clp->cl_session = session;
317 * The create session reply races with the server back
318 * channel probe. Mark the client NFS_CS_SESSION_INITING
319 * so that the client back channel can find the
322 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
326 #endif /* CONFIG_NFS_V4_1 */
329 * Initialize the minor version specific parts of an NFS4 client record
331 static int nfs4_init_client_minor_version(struct nfs_client *clp)
335 ret = clp->cl_mvops->init_client(clp);
338 return nfs4_init_callback(clp);
342 * nfs4_init_client - Initialise an NFS4 client record
344 * @clp: nfs_client to initialise
345 * @timeparms: timeout parameters for underlying RPC transport
346 * @ip_addr: callback IP address in presentation format
347 * @authflavor: authentication flavor for underlying RPC transport
349 * Returns pointer to an NFS client, or an ERR_PTR value.
351 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
352 const struct rpc_timeout *timeparms,
355 char buf[INET6_ADDRSTRLEN + 1];
356 struct nfs_client *old;
359 if (clp->cl_cons_state == NFS_CS_READY) {
360 /* the client is initialised already */
361 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
365 /* Check NFS protocol revision and initialize RPC op vector */
366 clp->rpc_ops = &nfs_v4_clientops;
368 if (clp->cl_minorversion != 0)
369 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
370 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
371 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
373 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_GSS_KRB5I);
374 if (error == -EINVAL)
375 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
379 /* If no clientaddr= option was specified, find a usable cb address */
380 if (ip_addr == NULL) {
381 struct sockaddr_storage cb_addr;
382 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
384 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
387 error = rpc_ntop(sap, buf, sizeof(buf));
390 ip_addr = (const char *)buf;
392 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
394 error = nfs_idmap_new(clp);
396 dprintk("%s: failed to create idmapper. Error = %d\n",
400 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
402 error = nfs4_init_client_minor_version(clp);
406 if (!nfs4_has_session(clp))
407 nfs_mark_client_ready(clp, NFS_CS_READY);
409 error = nfs4_discover_server_trunking(clp, &old);
414 clp->cl_preserve_clid = true;
419 nfs_mark_client_ready(clp, error);
421 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
422 return ERR_PTR(error);
426 * SETCLIENTID just did a callback update with the callback ident in
427 * "drop," but server trunking discovery claims "drop" and "keep" are
428 * actually the same server. Swap the callback IDs so that "keep"
429 * will continue to use the callback ident the server now knows about,
430 * and so that "keep"'s original callback ident is destroyed when
433 static void nfs4_swap_callback_idents(struct nfs_client *keep,
434 struct nfs_client *drop)
436 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
437 unsigned int save = keep->cl_cb_ident;
439 if (keep->cl_cb_ident == drop->cl_cb_ident)
442 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
443 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
445 spin_lock(&nn->nfs_client_lock);
447 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
448 keep->cl_cb_ident = drop->cl_cb_ident;
450 idr_replace(&nn->cb_ident_idr, drop, save);
451 drop->cl_cb_ident = save;
453 spin_unlock(&nn->nfs_client_lock);
456 static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
457 const struct nfs_client *clp2)
459 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
461 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
465 * nfs40_walk_client_list - Find server that recognizes a client ID
467 * @new: nfs_client with client ID to test
468 * @result: OUT: found nfs_client, or new
469 * @cred: credential to use for trunking test
471 * Returns zero, a negative errno, or a negative NFS4ERR status.
472 * If zero is returned, an nfs_client pointer is planted in "result."
474 * NB: nfs40_walk_client_list() relies on the new nfs_client being
475 * the last nfs_client on the list.
477 int nfs40_walk_client_list(struct nfs_client *new,
478 struct nfs_client **result,
479 struct rpc_cred *cred)
481 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
482 struct nfs_client *pos, *prev = NULL;
483 struct nfs4_setclientid_res clid = {
484 .clientid = new->cl_clientid,
485 .confirm = new->cl_confirm,
487 int status = -NFS4ERR_STALE_CLIENTID;
489 spin_lock(&nn->nfs_client_lock);
490 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
492 if (pos->rpc_ops != new->rpc_ops)
495 if (pos->cl_proto != new->cl_proto)
498 if (pos->cl_minorversion != new->cl_minorversion)
501 /* If "pos" isn't marked ready, we can't trust the
502 * remaining fields in "pos" */
503 if (pos->cl_cons_state > NFS_CS_READY) {
504 atomic_inc(&pos->cl_count);
505 spin_unlock(&nn->nfs_client_lock);
507 nfs_put_client(prev);
510 status = nfs_wait_client_init_complete(pos);
513 status = -NFS4ERR_STALE_CLIENTID;
514 spin_lock(&nn->nfs_client_lock);
516 if (pos->cl_cons_state != NFS_CS_READY)
519 if (pos->cl_clientid != new->cl_clientid)
522 if (!nfs4_match_client_owner_id(pos, new))
525 atomic_inc(&pos->cl_count);
526 spin_unlock(&nn->nfs_client_lock);
528 nfs_put_client(prev);
531 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
533 case -NFS4ERR_STALE_CLIENTID:
536 nfs4_swap_callback_idents(pos, new);
540 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
541 __func__, pos, atomic_read(&pos->cl_count));
545 /* The callback path may have been inadvertently
546 * changed. Schedule recovery!
548 nfs4_schedule_path_down_recovery(pos);
553 spin_lock(&nn->nfs_client_lock);
555 spin_unlock(&nn->nfs_client_lock);
557 /* No match found. The server lost our clientid */
559 nfs_put_client(prev);
560 dprintk("NFS: <-- %s status = %d\n", __func__, status);
564 #ifdef CONFIG_NFS_V4_1
566 * Returns true if the client IDs match
568 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
570 if (a->cl_clientid != b->cl_clientid) {
571 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
572 __func__, a->cl_clientid, b->cl_clientid);
575 dprintk("NFS: --> %s client ID %llx matches %llx\n",
576 __func__, a->cl_clientid, b->cl_clientid);
581 * Returns true if the server major ids match
584 nfs4_check_clientid_trunking(struct nfs_client *a, struct nfs_client *b)
586 struct nfs41_server_owner *o1 = a->cl_serverowner;
587 struct nfs41_server_owner *o2 = b->cl_serverowner;
589 if (o1->major_id_sz != o2->major_id_sz)
590 goto out_major_mismatch;
591 if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
592 goto out_major_mismatch;
594 dprintk("NFS: --> %s server owners match\n", __func__);
598 dprintk("NFS: --> %s server owner major IDs do not match\n",
604 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
606 * @new: nfs_client with client ID to test
607 * @result: OUT: found nfs_client, or new
608 * @cred: credential to use for trunking test
610 * Returns zero, a negative errno, or a negative NFS4ERR status.
611 * If zero is returned, an nfs_client pointer is planted in "result."
613 * NB: nfs41_walk_client_list() relies on the new nfs_client being
614 * the last nfs_client on the list.
616 int nfs41_walk_client_list(struct nfs_client *new,
617 struct nfs_client **result,
618 struct rpc_cred *cred)
620 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
621 struct nfs_client *pos, *prev = NULL;
622 int status = -NFS4ERR_STALE_CLIENTID;
624 spin_lock(&nn->nfs_client_lock);
625 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
627 if (pos->rpc_ops != new->rpc_ops)
630 if (pos->cl_proto != new->cl_proto)
633 if (pos->cl_minorversion != new->cl_minorversion)
636 /* If "pos" isn't marked ready, we can't trust the
637 * remaining fields in "pos", especially the client
638 * ID and serverowner fields. Wait for CREATE_SESSION
640 if (pos->cl_cons_state > NFS_CS_READY) {
641 atomic_inc(&pos->cl_count);
642 spin_unlock(&nn->nfs_client_lock);
644 nfs_put_client(prev);
647 status = nfs_wait_client_init_complete(pos);
649 nfs4_schedule_lease_recovery(pos);
650 status = nfs4_wait_clnt_recover(pos);
652 spin_lock(&nn->nfs_client_lock);
655 status = -NFS4ERR_STALE_CLIENTID;
657 if (pos->cl_cons_state != NFS_CS_READY)
660 if (!nfs4_match_clientids(pos, new))
664 * Note that session trunking is just a special subcase of
665 * client id trunking. In either case, we want to fall back
666 * to using the existing nfs_client.
668 if (!nfs4_check_clientid_trunking(pos, new))
671 /* Unlike NFSv4.0, we know that NFSv4.1 always uses the
672 * uniform string, however someone might switch the
673 * uniquifier string on us.
675 if (!nfs4_match_client_owner_id(pos, new))
678 atomic_inc(&pos->cl_count);
681 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
682 __func__, pos, atomic_read(&pos->cl_count));
686 /* No matching nfs_client found. */
687 spin_unlock(&nn->nfs_client_lock);
688 dprintk("NFS: <-- %s status = %d\n", __func__, status);
689 nfs_put_client(prev);
692 #endif /* CONFIG_NFS_V4_1 */
694 static void nfs4_destroy_server(struct nfs_server *server)
696 nfs_server_return_all_delegations(server);
697 unset_pnfs_layoutdriver(server);
698 nfs4_purge_state_owners(server);
702 * NFSv4.0 callback thread helper
704 * Find a client by callback identifier
707 nfs4_find_client_ident(struct net *net, int cb_ident)
709 struct nfs_client *clp;
710 struct nfs_net *nn = net_generic(net, nfs_net_id);
712 spin_lock(&nn->nfs_client_lock);
713 clp = idr_find(&nn->cb_ident_idr, cb_ident);
715 atomic_inc(&clp->cl_count);
716 spin_unlock(&nn->nfs_client_lock);
720 #if defined(CONFIG_NFS_V4_1)
721 /* Common match routine for v4.0 and v4.1 callback services */
722 static bool nfs4_cb_match_client(const struct sockaddr *addr,
723 struct nfs_client *clp, u32 minorversion)
725 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
727 /* Don't match clients that failed to initialise */
728 if (!(clp->cl_cons_state == NFS_CS_READY ||
729 clp->cl_cons_state == NFS_CS_SESSION_INITING))
734 /* Match the version and minorversion */
735 if (clp->rpc_ops->version != 4 ||
736 clp->cl_minorversion != minorversion)
739 /* Match only the IP address, not the port number */
740 if (!nfs_sockaddr_match_ipaddr(addr, clap))
747 * NFSv4.1 callback thread helper
748 * For CB_COMPOUND calls, find a client by IP address, protocol version,
749 * minorversion, and sessionID
751 * Returns NULL if no such client
754 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
755 struct nfs4_sessionid *sid, u32 minorversion)
757 struct nfs_client *clp;
758 struct nfs_net *nn = net_generic(net, nfs_net_id);
760 spin_lock(&nn->nfs_client_lock);
761 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
762 if (nfs4_cb_match_client(addr, clp, minorversion) == false)
765 if (!nfs4_has_session(clp))
769 if (memcmp(clp->cl_session->sess_id.data,
770 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
773 atomic_inc(&clp->cl_count);
774 spin_unlock(&nn->nfs_client_lock);
777 spin_unlock(&nn->nfs_client_lock);
781 #else /* CONFIG_NFS_V4_1 */
784 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
785 struct nfs4_sessionid *sid, u32 minorversion)
789 #endif /* CONFIG_NFS_V4_1 */
792 * Set up an NFS4 client
794 static int nfs4_set_client(struct nfs_server *server,
795 const char *hostname,
796 const struct sockaddr *addr,
797 const size_t addrlen,
799 rpc_authflavor_t authflavour,
800 int proto, const struct rpc_timeout *timeparms,
801 u32 minorversion, struct net *net)
803 struct nfs_client_initdata cl_init = {
804 .hostname = hostname,
809 .minorversion = minorversion,
812 struct nfs_client *clp;
815 dprintk("--> nfs4_set_client()\n");
817 if (server->flags & NFS_MOUNT_NORESVPORT)
818 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
819 if (server->options & NFS_OPTION_MIGRATION)
820 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
822 /* Allocate or find a client reference we can use */
823 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
825 error = PTR_ERR(clp);
830 * Query for the lease time on clientid setup or renewal
832 * Note that this will be set on nfs_clients that were created
833 * only for the DS role and did not set this bit, but now will
836 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
838 server->nfs_client = clp;
839 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
842 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
847 * Set up a pNFS Data Server client.
849 * Return any existing nfs_client that matches server address,port,version
852 * For a new nfs_client, use a soft mount (default), a low retrans and a
853 * low timeout interval so that if a connection is lost, we retry through
856 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
857 const struct sockaddr *ds_addr, int ds_addrlen,
858 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
860 struct nfs_client_initdata cl_init = {
862 .addrlen = ds_addrlen,
865 .minorversion = mds_clp->cl_minorversion,
866 .net = mds_clp->cl_net,
868 struct rpc_timeout ds_timeout;
869 struct nfs_client *clp;
870 char buf[INET6_ADDRSTRLEN + 1];
872 if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
873 return ERR_PTR(-EINVAL);
874 cl_init.hostname = buf;
877 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
878 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
879 * (section 13.1 RFC 5661).
881 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
882 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
883 mds_clp->cl_rpcclient->cl_auth->au_flavor);
885 dprintk("<-- %s %p\n", __func__, clp);
888 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
891 * Session has been established, and the client marked ready.
892 * Set the mount rsize and wsize with negotiated fore channel
893 * attributes which will be bound checked in nfs_server_set_fsinfo.
895 static void nfs4_session_set_rwsize(struct nfs_server *server)
897 #ifdef CONFIG_NFS_V4_1
898 struct nfs4_session *sess;
902 if (!nfs4_has_session(server->nfs_client))
904 sess = server->nfs_client->cl_session;
905 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
906 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
908 if (server->rsize > server_resp_sz)
909 server->rsize = server_resp_sz;
910 if (server->wsize > server_rqst_sz)
911 server->wsize = server_rqst_sz;
912 #endif /* CONFIG_NFS_V4_1 */
915 static int nfs4_server_common_setup(struct nfs_server *server,
916 struct nfs_fh *mntfh, bool auth_probe)
918 struct nfs_fattr *fattr;
921 /* data servers support only a subset of NFSv4.1 */
922 if (is_ds_only_client(server->nfs_client))
923 return -EPROTONOSUPPORT;
925 fattr = nfs_alloc_fattr();
929 /* We must ensure the session is initialised first */
930 error = nfs4_init_session(server->nfs_client);
934 /* Set the basic capabilities */
935 server->caps |= server->nfs_client->cl_mvops->init_caps;
936 if (server->flags & NFS_MOUNT_NORDIRPLUS)
937 server->caps &= ~NFS_CAP_READDIRPLUS;
939 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
942 if (nfs4_disable_idmapping &&
943 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
944 server->caps |= NFS_CAP_UIDGID_NOMAP;
947 /* Probe the root fh to retrieve its FSID and filehandle */
948 error = nfs4_get_rootfh(server, mntfh, auth_probe);
952 dprintk("Server FSID: %llx:%llx\n",
953 (unsigned long long) server->fsid.major,
954 (unsigned long long) server->fsid.minor);
955 nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
957 nfs4_session_set_rwsize(server);
959 error = nfs_probe_fsinfo(server, mntfh, fattr);
963 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
964 server->namelen = NFS4_MAXNAMLEN;
966 nfs_server_insert_lists(server);
967 server->mount_time = jiffies;
968 server->destroy = nfs4_destroy_server;
970 nfs_free_fattr(fattr);
975 * Create a version 4 volume record
977 static int nfs4_init_server(struct nfs_server *server,
978 struct nfs_parsed_mount_data *data)
980 struct rpc_timeout timeparms;
983 dprintk("--> nfs4_init_server()\n");
985 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
986 data->timeo, data->retrans);
988 /* Initialise the client representation from the mount data */
989 server->flags = data->flags;
990 server->options = data->options;
991 server->auth_info = data->auth_info;
993 /* Use the first specified auth flavor. If this flavor isn't
994 * allowed by the server, use the SECINFO path to try the
995 * other specified flavors */
996 if (data->auth_info.flavor_len >= 1)
997 data->selected_flavor = data->auth_info.flavors[0];
999 data->selected_flavor = RPC_AUTH_UNIX;
1001 /* Get a client record */
1002 error = nfs4_set_client(server,
1003 data->nfs_server.hostname,
1004 (const struct sockaddr *)&data->nfs_server.address,
1005 data->nfs_server.addrlen,
1006 data->client_address,
1007 data->selected_flavor,
1008 data->nfs_server.protocol,
1016 server->rsize = nfs_block_size(data->rsize, NULL);
1018 server->wsize = nfs_block_size(data->wsize, NULL);
1020 server->acregmin = data->acregmin * HZ;
1021 server->acregmax = data->acregmax * HZ;
1022 server->acdirmin = data->acdirmin * HZ;
1023 server->acdirmax = data->acdirmax * HZ;
1025 server->port = data->nfs_server.port;
1027 error = nfs_init_server_rpcclient(server, &timeparms,
1028 data->selected_flavor);
1032 dprintk("<-- nfs4_init_server() = %d\n", error);
1037 * Create a version 4 volume record
1038 * - keyed on server and FSID
1040 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1041 struct nfs_fh *mntfh)*/
1042 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
1043 struct nfs_subversion *nfs_mod)
1045 struct nfs_server *server;
1049 dprintk("--> nfs4_create_server()\n");
1051 server = nfs_alloc_server();
1053 return ERR_PTR(-ENOMEM);
1055 auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
1057 /* set up the general RPC client */
1058 error = nfs4_init_server(server, mount_info->parsed);
1062 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
1066 dprintk("<-- nfs4_create_server() = %p\n", server);
1070 nfs_free_server(server);
1071 dprintk("<-- nfs4_create_server() = error %d\n", error);
1072 return ERR_PTR(error);
1076 * Create an NFS4 referral server record
1078 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1079 struct nfs_fh *mntfh)
1081 struct nfs_client *parent_client;
1082 struct nfs_server *server, *parent_server;
1086 dprintk("--> nfs4_create_referral_server()\n");
1088 server = nfs_alloc_server();
1090 return ERR_PTR(-ENOMEM);
1092 parent_server = NFS_SB(data->sb);
1093 parent_client = parent_server->nfs_client;
1095 /* Initialise the client representation from the parent server */
1096 nfs_server_copy_userdata(server, parent_server);
1098 /* Get a client representation.
1099 * Note: NFSv4 always uses TCP, */
1100 error = nfs4_set_client(server, data->hostname,
1103 parent_client->cl_ipaddr,
1105 rpc_protocol(parent_server->client),
1106 parent_server->client->cl_timeout,
1107 parent_client->cl_mvops->minor_version,
1108 parent_client->cl_net);
1112 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1116 auth_probe = parent_server->auth_info.flavor_len < 1;
1118 error = nfs4_server_common_setup(server, mntfh, auth_probe);
1122 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1126 nfs_free_server(server);
1127 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1128 return ERR_PTR(error);
1132 * Grab the destination's particulars, including lease expiry time.
1134 * Returns zero if probe succeeded and retrieved FSID matches the FSID
1137 static int nfs_probe_destination(struct nfs_server *server)
1139 struct inode *inode = server->super->s_root->d_inode;
1140 struct nfs_fattr *fattr;
1143 fattr = nfs_alloc_fattr();
1147 /* Sanity: the probe won't work if the destination server
1148 * does not recognize the migrated FH. */
1149 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1151 nfs_free_fattr(fattr);
1156 * nfs4_update_server - Move an nfs_server to a different nfs_client
1158 * @server: represents FSID to be moved
1159 * @hostname: new end-point's hostname
1160 * @sap: new end-point's socket address
1161 * @salen: size of "sap"
1162 * @net: net namespace
1164 * The nfs_server must be quiescent before this function is invoked.
1165 * Either its session is drained (NFSv4.1+), or its transport is
1166 * plugged and drained (NFSv4.0).
1168 * Returns zero on success, or a negative errno value.
1170 int nfs4_update_server(struct nfs_server *server, const char *hostname,
1171 struct sockaddr *sap, size_t salen, struct net *net)
1173 struct nfs_client *clp = server->nfs_client;
1174 struct rpc_clnt *clnt = server->client;
1175 struct xprt_create xargs = {
1176 .ident = clp->cl_proto,
1180 .servername = hostname,
1182 char buf[INET6_ADDRSTRLEN + 1];
1183 struct sockaddr_storage address;
1184 struct sockaddr *localaddr = (struct sockaddr *)&address;
1187 dprintk("--> %s: move FSID %llx:%llx to \"%s\")\n", __func__,
1188 (unsigned long long)server->fsid.major,
1189 (unsigned long long)server->fsid.minor,
1192 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1194 dprintk("<-- %s(): rpc_switch_client_transport returned %d\n",
1199 error = rpc_localaddr(clnt, localaddr, sizeof(address));
1201 dprintk("<-- %s(): rpc_localaddr returned %d\n",
1206 error = -EAFNOSUPPORT;
1207 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) {
1208 dprintk("<-- %s(): rpc_ntop returned %d\n",
1213 nfs_server_remove_lists(server);
1214 error = nfs4_set_client(server, hostname, sap, salen, buf,
1215 clp->cl_rpcclient->cl_auth->au_flavor,
1216 clp->cl_proto, clnt->cl_timeout,
1217 clp->cl_minorversion, net);
1218 nfs_put_client(clp);
1220 nfs_server_insert_lists(server);
1221 dprintk("<-- %s(): nfs4_set_client returned %d\n",
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 error = nfs_probe_destination(server);
1234 dprintk("<-- %s() succeeded\n", __func__);