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)
180 char buf[INET6_ADDRSTRLEN + 1];
181 const char *ip_addr = cl_init->ip_addr;
182 struct nfs_client *clp = nfs_alloc_client(cl_init);
188 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
192 if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
197 spin_lock_init(&clp->cl_lock);
198 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
199 INIT_LIST_HEAD(&clp->cl_ds_clients);
200 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
201 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
202 clp->cl_minorversion = cl_init->minorversion;
203 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
205 #if IS_ENABLED(CONFIG_NFS_V4_1)
206 init_waitqueue_head(&clp->cl_lock_waitq);
209 if (cl_init->minorversion != 0)
210 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
211 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
212 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
215 * Set up the connection to the server before we add add to the
218 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
220 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
224 /* If no clientaddr= option was specified, find a usable cb address */
225 if (ip_addr == NULL) {
226 struct sockaddr_storage cb_addr;
227 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
229 err = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
232 err = rpc_ntop(sap, buf, sizeof(buf));
235 ip_addr = (const char *)buf;
237 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
239 err = nfs_idmap_new(clp);
241 dprintk("%s: failed to create idmapper. Error = %d\n",
245 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
249 nfs_free_client(clp);
254 * Destroy the NFS4 callback service
256 static void nfs4_destroy_callback(struct nfs_client *clp)
258 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
259 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
262 static void nfs4_shutdown_client(struct nfs_client *clp)
264 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
265 nfs4_kill_renewd(clp);
266 clp->cl_mvops->shutdown_client(clp);
267 nfs4_destroy_callback(clp);
268 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
269 nfs_idmap_delete(clp);
271 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
272 kfree(clp->cl_serverowner);
273 kfree(clp->cl_serverscope);
274 kfree(clp->cl_implid);
275 kfree(clp->cl_owner_id);
278 void nfs4_free_client(struct nfs_client *clp)
280 nfs4_shutdown_client(clp);
281 nfs_free_client(clp);
285 * Initialize the NFS4 callback service
287 static int nfs4_init_callback(struct nfs_client *clp)
289 struct rpc_xprt *xprt;
292 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
294 if (nfs4_has_session(clp)) {
295 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
300 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
302 dprintk("%s: failed to start callback. Error = %d\n",
306 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
312 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
313 * @clp - nfs_client to initialize
315 * Returns zero on success, or a negative errno if some error occurred.
317 int nfs40_init_client(struct nfs_client *clp)
319 struct nfs4_slot_table *tbl;
322 tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
326 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
327 "NFSv4.0 transport Slot table");
329 nfs4_shutdown_slot_table(tbl);
334 clp->cl_slot_tbl = tbl;
338 #if defined(CONFIG_NFS_V4_1)
341 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
342 * @clp - nfs_client to initialize
344 * Returns zero on success, or a negative errno if some error occurred.
346 int nfs41_init_client(struct nfs_client *clp)
348 struct nfs4_session *session = NULL;
351 * Create the session and mark it expired.
352 * When a SEQUENCE operation encounters the expired session
353 * it will do session recovery to initialize it.
355 session = nfs4_alloc_session(clp);
359 clp->cl_session = session;
362 * The create session reply races with the server back
363 * channel probe. Mark the client NFS_CS_SESSION_INITING
364 * so that the client back channel can find the
367 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
371 #endif /* CONFIG_NFS_V4_1 */
374 * Initialize the minor version specific parts of an NFS4 client record
376 static int nfs4_init_client_minor_version(struct nfs_client *clp)
380 ret = clp->cl_mvops->init_client(clp);
383 return nfs4_init_callback(clp);
387 * nfs4_init_client - Initialise an NFS4 client record
389 * @clp: nfs_client to initialise
390 * @timeparms: timeout parameters for underlying RPC transport
391 * @ip_addr: callback IP address in presentation format
392 * @authflavor: authentication flavor for underlying RPC transport
394 * Returns pointer to an NFS client, or an ERR_PTR value.
396 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
397 const struct nfs_client_initdata *cl_init)
399 struct nfs_client *old;
402 if (clp->cl_cons_state == NFS_CS_READY)
403 /* the client is initialised already */
406 error = nfs4_init_client_minor_version(clp);
410 error = nfs4_discover_server_trunking(clp, &old);
415 clp->cl_preserve_clid = true;
417 * Mark the client as having failed initialization so other
418 * processes walking the nfs_client_list in nfs_match_client()
419 * won't try to use it.
421 nfs_mark_client_ready(clp, -EPERM);
423 clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags);
428 nfs_mark_client_ready(clp, error);
430 return ERR_PTR(error);
434 * SETCLIENTID just did a callback update with the callback ident in
435 * "drop," but server trunking discovery claims "drop" and "keep" are
436 * actually the same server. Swap the callback IDs so that "keep"
437 * will continue to use the callback ident the server now knows about,
438 * and so that "keep"'s original callback ident is destroyed when
441 static void nfs4_swap_callback_idents(struct nfs_client *keep,
442 struct nfs_client *drop)
444 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
445 unsigned int save = keep->cl_cb_ident;
447 if (keep->cl_cb_ident == drop->cl_cb_ident)
450 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
451 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
453 spin_lock(&nn->nfs_client_lock);
455 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
456 keep->cl_cb_ident = drop->cl_cb_ident;
458 idr_replace(&nn->cb_ident_idr, drop, save);
459 drop->cl_cb_ident = save;
461 spin_unlock(&nn->nfs_client_lock);
464 static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
465 const struct nfs_client *clp2)
467 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
469 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
472 static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2)
474 return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0;
477 static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new,
478 struct nfs_client **prev, struct nfs_net *nn)
482 if (pos->rpc_ops != new->rpc_ops)
485 if (pos->cl_minorversion != new->cl_minorversion)
488 /* If "pos" isn't marked ready, we can't trust the
489 * remaining fields in "pos", especially the client
490 * ID and serverowner fields. Wait for CREATE_SESSION
492 if (pos->cl_cons_state > NFS_CS_READY) {
493 atomic_inc(&pos->cl_count);
494 spin_unlock(&nn->nfs_client_lock);
496 nfs_put_client(*prev);
499 status = nfs_wait_client_init_complete(pos);
500 spin_lock(&nn->nfs_client_lock);
506 if (pos->cl_cons_state != NFS_CS_READY)
509 if (pos->cl_clientid != new->cl_clientid)
512 /* NFSv4.1 always uses the uniform string, however someone
513 * might switch the uniquifier string on us.
515 if (!nfs4_match_client_owner_id(pos, new))
522 * nfs40_walk_client_list - Find server that recognizes a client ID
524 * @new: nfs_client with client ID to test
525 * @result: OUT: found nfs_client, or new
526 * @cred: credential to use for trunking test
528 * Returns zero, a negative errno, or a negative NFS4ERR status.
529 * If zero is returned, an nfs_client pointer is planted in "result."
531 * NB: nfs40_walk_client_list() relies on the new nfs_client being
532 * the last nfs_client on the list.
534 int nfs40_walk_client_list(struct nfs_client *new,
535 struct nfs_client **result,
536 struct rpc_cred *cred)
538 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
539 struct nfs_client *pos, *prev = NULL;
540 struct nfs4_setclientid_res clid = {
541 .clientid = new->cl_clientid,
542 .confirm = new->cl_confirm,
544 int status = -NFS4ERR_STALE_CLIENTID;
546 spin_lock(&nn->nfs_client_lock);
547 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
552 status = nfs4_match_client(pos, new, &prev, nn);
558 * We just sent a new SETCLIENTID, which should have
559 * caused the server to return a new cl_confirm. So if
560 * cl_confirm is the same, then this is a different
561 * server that just returned the same cl_confirm by
564 if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm,
568 * But if the cl_confirm's are different, then the only
569 * way that a SETCLIENTID_CONFIRM to pos can succeed is
570 * if new and pos point to the same server:
573 atomic_inc(&pos->cl_count);
574 spin_unlock(&nn->nfs_client_lock);
576 nfs_put_client(prev);
579 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
581 case -NFS4ERR_STALE_CLIENTID:
584 nfs4_swap_callback_idents(pos, new);
585 pos->cl_confirm = new->cl_confirm;
586 nfs_mark_client_ready(pos, NFS_CS_READY);
593 /* The callback path may have been inadvertently
594 * changed. Schedule recovery!
596 nfs4_schedule_path_down_recovery(pos);
601 spin_lock(&nn->nfs_client_lock);
604 spin_unlock(&nn->nfs_client_lock);
606 /* No match found. The server lost our clientid */
608 nfs_put_client(prev);
612 #ifdef CONFIG_NFS_V4_1
614 * Returns true if the server major ids match
617 nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
618 struct nfs41_server_owner *o2)
620 if (o1->major_id_sz != o2->major_id_sz)
622 return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0;
626 * Returns true if the server scopes match
629 nfs4_check_server_scope(struct nfs41_server_scope *s1,
630 struct nfs41_server_scope *s2)
632 if (s1->server_scope_sz != s2->server_scope_sz)
634 return memcmp(s1->server_scope, s2->server_scope,
635 s1->server_scope_sz) == 0;
639 * nfs4_detect_session_trunking - Checks for session trunking.
641 * Called after a successful EXCHANGE_ID on a multi-addr connection.
642 * Upon success, add the transport.
644 * @clp: original mount nfs_client
645 * @res: result structure from an exchange_id using the original mount
646 * nfs_client with a new multi_addr transport
648 * Returns zero on success, otherwise -EINVAL
650 * Note: since the exchange_id for the new multi_addr transport uses the
651 * same nfs_client from the original mount, the cl_owner_id is reused,
652 * so eir_clientowner is the same.
654 int nfs4_detect_session_trunking(struct nfs_client *clp,
655 struct nfs41_exchange_id_res *res,
656 struct rpc_xprt *xprt)
658 /* Check eir_clientid */
659 if (clp->cl_clientid != res->clientid)
662 /* Check eir_server_owner so_major_id */
663 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner,
667 /* Check eir_server_owner so_minor_id */
668 if (clp->cl_serverowner->minor_id != res->server_owner->minor_id)
671 /* Check eir_server_scope */
672 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope))
675 pr_info("NFS: %s: Session trunking succeeded for %s\n",
677 xprt->address_strings[RPC_DISPLAY_ADDR]);
681 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname,
682 xprt->address_strings[RPC_DISPLAY_ADDR]);
688 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
690 * @new: nfs_client with client ID to test
691 * @result: OUT: found nfs_client, or new
692 * @cred: credential to use for trunking test
694 * Returns zero, a negative errno, or a negative NFS4ERR status.
695 * If zero is returned, an nfs_client pointer is planted in "result."
697 * NB: nfs41_walk_client_list() relies on the new nfs_client being
698 * the last nfs_client on the list.
700 int nfs41_walk_client_list(struct nfs_client *new,
701 struct nfs_client **result,
702 struct rpc_cred *cred)
704 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
705 struct nfs_client *pos, *prev = NULL;
706 int status = -NFS4ERR_STALE_CLIENTID;
708 spin_lock(&nn->nfs_client_lock);
709 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
714 status = nfs4_match_client(pos, new, &prev, nn);
721 * Note that session trunking is just a special subcase of
722 * client id trunking. In either case, we want to fall back
723 * to using the existing nfs_client.
725 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner,
726 new->cl_serverowner))
730 atomic_inc(&pos->cl_count);
737 spin_unlock(&nn->nfs_client_lock);
738 nfs_put_client(prev);
741 #endif /* CONFIG_NFS_V4_1 */
743 static void nfs4_destroy_server(struct nfs_server *server)
747 nfs_server_return_all_delegations(server);
748 unset_pnfs_layoutdriver(server);
749 nfs4_purge_state_owners(server, &freeme);
750 nfs4_free_state_owners(&freeme);
754 * NFSv4.0 callback thread helper
756 * Find a client by callback identifier
759 nfs4_find_client_ident(struct net *net, int cb_ident)
761 struct nfs_client *clp;
762 struct nfs_net *nn = net_generic(net, nfs_net_id);
764 spin_lock(&nn->nfs_client_lock);
765 clp = idr_find(&nn->cb_ident_idr, cb_ident);
767 atomic_inc(&clp->cl_count);
768 spin_unlock(&nn->nfs_client_lock);
772 #if defined(CONFIG_NFS_V4_1)
773 /* Common match routine for v4.0 and v4.1 callback services */
774 static bool nfs4_cb_match_client(const struct sockaddr *addr,
775 struct nfs_client *clp, u32 minorversion)
777 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
779 /* Don't match clients that failed to initialise */
780 if (!(clp->cl_cons_state == NFS_CS_READY ||
781 clp->cl_cons_state == NFS_CS_SESSION_INITING))
786 /* Match the version and minorversion */
787 if (clp->rpc_ops->version != 4 ||
788 clp->cl_minorversion != minorversion)
791 /* Match only the IP address, not the port number */
792 return rpc_cmp_addr(addr, clap);
796 * NFSv4.1 callback thread helper
797 * For CB_COMPOUND calls, find a client by IP address, protocol version,
798 * minorversion, and sessionID
800 * Returns NULL if no such client
803 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
804 struct nfs4_sessionid *sid, u32 minorversion)
806 struct nfs_client *clp;
807 struct nfs_net *nn = net_generic(net, nfs_net_id);
809 spin_lock(&nn->nfs_client_lock);
810 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
811 if (nfs4_cb_match_client(addr, clp, minorversion) == false)
814 if (!nfs4_has_session(clp))
818 if (memcmp(clp->cl_session->sess_id.data,
819 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
822 atomic_inc(&clp->cl_count);
823 spin_unlock(&nn->nfs_client_lock);
826 spin_unlock(&nn->nfs_client_lock);
830 #else /* CONFIG_NFS_V4_1 */
833 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
834 struct nfs4_sessionid *sid, u32 minorversion)
838 #endif /* CONFIG_NFS_V4_1 */
841 * Set up an NFS4 client
843 static int nfs4_set_client(struct nfs_server *server,
844 const char *hostname,
845 const struct sockaddr *addr,
846 const size_t addrlen,
848 int proto, const struct rpc_timeout *timeparms,
849 u32 minorversion, struct net *net)
851 struct nfs_client_initdata cl_init = {
852 .hostname = hostname,
858 .minorversion = minorversion,
860 .timeparms = timeparms,
862 struct nfs_client *clp;
864 if (server->flags & NFS_MOUNT_NORESVPORT)
865 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
866 if (server->options & NFS_OPTION_MIGRATION)
867 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
868 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status))
869 set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags);
871 /* Allocate or find a client reference we can use */
872 clp = nfs_get_client(&cl_init);
876 if (server->nfs_client == clp) {
882 * Query for the lease time on clientid setup or renewal
884 * Note that this will be set on nfs_clients that were created
885 * only for the DS role and did not set this bit, but now will
888 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
890 server->nfs_client = clp;
895 * Set up a pNFS Data Server client.
897 * Return any existing nfs_client that matches server address,port,version
900 * For a new nfs_client, use a soft mount (default), a low retrans and a
901 * low timeout interval so that if a connection is lost, we retry through
904 struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
905 const struct sockaddr *ds_addr, int ds_addrlen,
906 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
909 struct rpc_timeout ds_timeout;
910 struct nfs_client *mds_clp = mds_srv->nfs_client;
911 struct nfs_client_initdata cl_init = {
913 .addrlen = ds_addrlen,
914 .nodename = mds_clp->cl_rpcclient->cl_nodename,
915 .ip_addr = mds_clp->cl_ipaddr,
918 .minorversion = minor_version,
919 .net = mds_clp->cl_net,
920 .timeparms = &ds_timeout,
922 char buf[INET6_ADDRSTRLEN + 1];
924 if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
925 return ERR_PTR(-EINVAL);
926 cl_init.hostname = buf;
928 if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
929 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
932 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
933 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
934 * (section 13.1 RFC 5661).
936 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
937 return nfs_get_client(&cl_init);
939 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
942 * Session has been established, and the client marked ready.
943 * Limit the mount rsize, wsize and dtsize using negotiated fore
944 * channel attributes.
946 static void nfs4_session_limit_rwsize(struct nfs_server *server)
948 #ifdef CONFIG_NFS_V4_1
949 struct nfs4_session *sess;
953 if (!nfs4_has_session(server->nfs_client))
955 sess = server->nfs_client->cl_session;
956 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
957 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
959 if (server->dtsize > server_resp_sz)
960 server->dtsize = server_resp_sz;
961 if (server->rsize > server_resp_sz)
962 server->rsize = server_resp_sz;
963 if (server->wsize > server_rqst_sz)
964 server->wsize = server_rqst_sz;
965 #endif /* CONFIG_NFS_V4_1 */
968 static int nfs4_server_common_setup(struct nfs_server *server,
969 struct nfs_fh *mntfh, bool auth_probe)
971 struct nfs_fattr *fattr;
974 /* data servers support only a subset of NFSv4.1 */
975 if (is_ds_only_client(server->nfs_client))
976 return -EPROTONOSUPPORT;
978 fattr = nfs_alloc_fattr();
982 /* We must ensure the session is initialised first */
983 error = nfs4_init_session(server->nfs_client);
987 /* Set the basic capabilities */
988 server->caps |= server->nfs_client->cl_mvops->init_caps;
989 if (server->flags & NFS_MOUNT_NORDIRPLUS)
990 server->caps &= ~NFS_CAP_READDIRPLUS;
992 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
995 if (nfs4_disable_idmapping &&
996 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
997 server->caps |= NFS_CAP_UIDGID_NOMAP;
1000 /* Probe the root fh to retrieve its FSID and filehandle */
1001 error = nfs4_get_rootfh(server, mntfh, auth_probe);
1005 dprintk("Server FSID: %llx:%llx\n",
1006 (unsigned long long) server->fsid.major,
1007 (unsigned long long) server->fsid.minor);
1008 nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
1010 error = nfs_probe_fsinfo(server, mntfh, fattr);
1014 nfs4_session_limit_rwsize(server);
1016 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1017 server->namelen = NFS4_MAXNAMLEN;
1019 nfs_server_insert_lists(server);
1020 server->mount_time = jiffies;
1021 server->destroy = nfs4_destroy_server;
1023 nfs_free_fattr(fattr);
1028 * Create a version 4 volume record
1030 static int nfs4_init_server(struct nfs_server *server,
1031 struct nfs_parsed_mount_data *data)
1033 struct rpc_timeout timeparms;
1036 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1037 data->timeo, data->retrans);
1039 /* Initialise the client representation from the mount data */
1040 server->flags = data->flags;
1041 server->options = data->options;
1042 server->auth_info = data->auth_info;
1044 /* Use the first specified auth flavor. If this flavor isn't
1045 * allowed by the server, use the SECINFO path to try the
1046 * other specified flavors */
1047 if (data->auth_info.flavor_len >= 1)
1048 data->selected_flavor = data->auth_info.flavors[0];
1050 data->selected_flavor = RPC_AUTH_UNIX;
1052 /* Get a client record */
1053 error = nfs4_set_client(server,
1054 data->nfs_server.hostname,
1055 (const struct sockaddr *)&data->nfs_server.address,
1056 data->nfs_server.addrlen,
1057 data->client_address,
1058 data->nfs_server.protocol,
1066 server->rsize = nfs_block_size(data->rsize, NULL);
1068 server->wsize = nfs_block_size(data->wsize, NULL);
1070 server->acregmin = data->acregmin * HZ;
1071 server->acregmax = data->acregmax * HZ;
1072 server->acdirmin = data->acdirmin * HZ;
1073 server->acdirmax = data->acdirmax * HZ;
1074 server->port = data->nfs_server.port;
1076 return nfs_init_server_rpcclient(server, &timeparms,
1077 data->selected_flavor);
1081 * Create a version 4 volume record
1082 * - keyed on server and FSID
1084 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1085 struct nfs_fh *mntfh)*/
1086 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
1087 struct nfs_subversion *nfs_mod)
1089 struct nfs_server *server;
1093 server = nfs_alloc_server();
1095 return ERR_PTR(-ENOMEM);
1097 auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
1099 /* set up the general RPC client */
1100 error = nfs4_init_server(server, mount_info->parsed);
1104 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
1111 nfs_free_server(server);
1112 return ERR_PTR(error);
1116 * Create an NFS4 referral server record
1118 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1119 struct nfs_fh *mntfh)
1121 struct nfs_client *parent_client;
1122 struct nfs_server *server, *parent_server;
1126 server = nfs_alloc_server();
1128 return ERR_PTR(-ENOMEM);
1130 parent_server = NFS_SB(data->sb);
1131 parent_client = parent_server->nfs_client;
1133 /* Initialise the client representation from the parent server */
1134 nfs_server_copy_userdata(server, parent_server);
1136 /* Get a client representation.
1137 * Note: NFSv4 always uses TCP, */
1138 error = nfs4_set_client(server, data->hostname,
1141 parent_client->cl_ipaddr,
1142 rpc_protocol(parent_server->client),
1143 parent_server->client->cl_timeout,
1144 parent_client->cl_mvops->minor_version,
1145 parent_client->cl_net);
1149 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1153 auth_probe = parent_server->auth_info.flavor_len < 1;
1155 error = nfs4_server_common_setup(server, mntfh, auth_probe);
1162 nfs_free_server(server);
1163 return ERR_PTR(error);
1167 * Grab the destination's particulars, including lease expiry time.
1169 * Returns zero if probe succeeded and retrieved FSID matches the FSID
1172 static int nfs_probe_destination(struct nfs_server *server)
1174 struct inode *inode = d_inode(server->super->s_root);
1175 struct nfs_fattr *fattr;
1178 fattr = nfs_alloc_fattr();
1182 /* Sanity: the probe won't work if the destination server
1183 * does not recognize the migrated FH. */
1184 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1186 nfs_free_fattr(fattr);
1191 * nfs4_update_server - Move an nfs_server to a different nfs_client
1193 * @server: represents FSID to be moved
1194 * @hostname: new end-point's hostname
1195 * @sap: new end-point's socket address
1196 * @salen: size of "sap"
1197 * @net: net namespace
1199 * The nfs_server must be quiescent before this function is invoked.
1200 * Either its session is drained (NFSv4.1+), or its transport is
1201 * plugged and drained (NFSv4.0).
1203 * Returns zero on success, or a negative errno value.
1205 int nfs4_update_server(struct nfs_server *server, const char *hostname,
1206 struct sockaddr *sap, size_t salen, struct net *net)
1208 struct nfs_client *clp = server->nfs_client;
1209 struct rpc_clnt *clnt = server->client;
1210 struct xprt_create xargs = {
1211 .ident = clp->cl_proto,
1215 .servername = hostname,
1217 char buf[INET6_ADDRSTRLEN + 1];
1218 struct sockaddr_storage address;
1219 struct sockaddr *localaddr = (struct sockaddr *)&address;
1222 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1226 error = rpc_localaddr(clnt, localaddr, sizeof(address));
1230 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0)
1231 return -EAFNOSUPPORT;
1233 nfs_server_remove_lists(server);
1234 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1235 error = nfs4_set_client(server, hostname, sap, salen, buf,
1236 clp->cl_proto, clnt->cl_timeout,
1237 clp->cl_minorversion, net);
1238 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1240 nfs_server_insert_lists(server);
1243 nfs_put_client(clp);
1245 if (server->nfs_client->cl_hostname == NULL) {
1246 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1247 if (server->nfs_client->cl_hostname == NULL)
1250 nfs_server_insert_lists(server);
1252 return nfs_probe_destination(server);