1 /* client.c: NFS client sharing and management code
3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/sched.h>
16 #include <linux/time.h>
17 #include <linux/kernel.h>
19 #include <linux/string.h>
20 #include <linux/stat.h>
21 #include <linux/errno.h>
22 #include <linux/unistd.h>
23 #include <linux/sunrpc/clnt.h>
24 #include <linux/sunrpc/stats.h>
25 #include <linux/sunrpc/metrics.h>
26 #include <linux/sunrpc/xprtsock.h>
27 #include <linux/sunrpc/xprtrdma.h>
28 #include <linux/nfs_fs.h>
29 #include <linux/nfs_mount.h>
30 #include <linux/nfs4_mount.h>
31 #include <linux/lockd/bind.h>
32 #include <linux/seq_file.h>
33 #include <linux/mount.h>
34 #include <linux/nfs_idmap.h>
35 #include <linux/vfs.h>
36 #include <linux/inet.h>
37 #include <linux/in6.h>
38 #include <linux/slab.h>
40 #include <linux/nfs_xdr.h>
41 #include <linux/sunrpc/bc_xprt.h>
42 #include <linux/nsproxy.h>
43 #include <linux/pid_namespace.h>
45 #include <asm/system.h>
49 #include "delegation.h"
56 #define NFSDBG_FACILITY NFSDBG_CLIENT
58 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
62 * Get a unique NFSv4.0 callback identifier which will be used
63 * by the V4.0 callback service to lookup the nfs_client struct
65 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
68 struct nfs_net *nn = net_generic(clp->net, nfs_net_id);
70 if (clp->rpc_ops->version != 4 || minorversion != 0)
73 if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL))
75 spin_lock(&nn->nfs_client_lock);
76 ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident);
77 spin_unlock(&nn->nfs_client_lock);
82 #endif /* CONFIG_NFS_V4 */
85 * Turn off NFSv4 uid/gid mapping when using AUTH_SYS
87 static bool nfs4_disable_idmapping = true;
92 static const struct rpc_version *nfs_version[5] = {
102 const struct rpc_program nfs_program = {
104 .number = NFS_PROGRAM,
105 .nrvers = ARRAY_SIZE(nfs_version),
106 .version = nfs_version,
107 .stats = &nfs_rpcstat,
108 .pipe_dir_name = NFS_PIPE_DIRNAME,
111 struct rpc_stat nfs_rpcstat = {
112 .program = &nfs_program
116 #ifdef CONFIG_NFS_V3_ACL
117 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
118 static const struct rpc_version *nfsacl_version[] = {
119 [3] = &nfsacl_version3,
122 const struct rpc_program nfsacl_program = {
124 .number = NFS_ACL_PROGRAM,
125 .nrvers = ARRAY_SIZE(nfsacl_version),
126 .version = nfsacl_version,
127 .stats = &nfsacl_rpcstat,
129 #endif /* CONFIG_NFS_V3_ACL */
131 struct nfs_client_initdata {
132 const char *hostname;
133 const struct sockaddr *addr;
135 const struct nfs_rpc_ops *rpc_ops;
142 * Allocate a shared client record
144 * Since these are allocated/deallocated very rarely, we don't
145 * bother putting them in a slab cache...
147 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
149 struct nfs_client *clp;
150 struct rpc_cred *cred;
153 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
156 clp->rpc_ops = cl_init->rpc_ops;
158 atomic_set(&clp->cl_count, 1);
159 clp->cl_cons_state = NFS_CS_INITING;
161 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
162 clp->cl_addrlen = cl_init->addrlen;
164 if (cl_init->hostname) {
166 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
167 if (!clp->cl_hostname)
171 INIT_LIST_HEAD(&clp->cl_superblocks);
172 clp->cl_rpcclient = ERR_PTR(-EINVAL);
174 clp->cl_proto = cl_init->proto;
175 clp->net = get_net(cl_init->net);
178 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
182 spin_lock_init(&clp->cl_lock);
183 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
184 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
185 clp->cl_boot_time = CURRENT_TIME;
186 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
187 clp->cl_minorversion = cl_init->minorversion;
188 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
190 cred = rpc_lookup_machine_cred("*");
192 clp->cl_machine_cred = cred;
193 nfs_fscache_get_client_cookie(clp);
204 #ifdef CONFIG_NFS_V4_1
205 static void nfs4_shutdown_session(struct nfs_client *clp)
207 if (nfs4_has_session(clp)) {
208 nfs4_deviceid_purge_client(clp);
209 nfs4_destroy_session(clp->cl_session);
213 #else /* CONFIG_NFS_V4_1 */
214 static void nfs4_shutdown_session(struct nfs_client *clp)
217 #endif /* CONFIG_NFS_V4_1 */
220 * Destroy the NFS4 callback service
222 static void nfs4_destroy_callback(struct nfs_client *clp)
224 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
225 nfs_callback_down(clp->cl_mvops->minor_version);
228 static void nfs4_shutdown_client(struct nfs_client *clp)
230 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
231 nfs4_kill_renewd(clp);
232 nfs4_shutdown_session(clp);
233 nfs4_destroy_callback(clp);
234 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
235 nfs_idmap_delete(clp);
237 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
240 /* idr_remove_all is not needed as all id's are removed by nfs_put_client */
241 void nfs_cleanup_cb_ident_idr(struct net *net)
243 struct nfs_net *nn = net_generic(net, nfs_net_id);
245 idr_destroy(&nn->cb_ident_idr);
248 /* nfs_client_lock held */
249 static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
251 struct nfs_net *nn = net_generic(clp->net, nfs_net_id);
253 if (clp->cl_cb_ident)
254 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
257 static void pnfs_init_server(struct nfs_server *server)
259 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
262 static void nfs4_destroy_server(struct nfs_server *server)
264 nfs4_purge_state_owners(server);
268 static void nfs4_shutdown_client(struct nfs_client *clp)
272 void nfs_cleanup_cb_ident_idr(struct net *net)
276 static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
280 static void pnfs_init_server(struct nfs_server *server)
284 #endif /* CONFIG_NFS_V4 */
287 * Destroy a shared client record
289 static void nfs_free_client(struct nfs_client *clp)
291 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
293 nfs4_shutdown_client(clp);
295 nfs_fscache_release_client_cookie(clp);
297 /* -EIO all pending I/O */
298 if (!IS_ERR(clp->cl_rpcclient))
299 rpc_shutdown_client(clp->cl_rpcclient);
301 if (clp->cl_machine_cred != NULL)
302 put_rpccred(clp->cl_machine_cred);
305 kfree(clp->cl_hostname);
306 kfree(clp->server_scope);
310 dprintk("<-- nfs_free_client()\n");
314 * Release a reference to a shared client record
316 void nfs_put_client(struct nfs_client *clp)
323 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
324 nn = net_generic(clp->net, nfs_net_id);
326 if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
327 list_del(&clp->cl_share_link);
328 nfs_cb_idr_remove_locked(clp);
329 spin_unlock(&nn->nfs_client_lock);
331 BUG_ON(!list_empty(&clp->cl_superblocks));
333 nfs_free_client(clp);
336 EXPORT_SYMBOL_GPL(nfs_put_client);
338 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
340 * Test if two ip6 socket addresses refer to the same socket by
341 * comparing relevant fields. The padding bytes specifically, are not
342 * compared. sin6_flowinfo is not compared because it only affects QoS
343 * and sin6_scope_id is only compared if the address is "link local"
344 * because "link local" addresses need only be unique to a specific
345 * link. Conversely, ordinary unicast addresses might have different
348 * The caller should ensure both socket addresses are AF_INET6.
350 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
351 const struct sockaddr *sa2)
353 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
354 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
356 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
358 else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL)
359 return sin1->sin6_scope_id == sin2->sin6_scope_id;
363 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
364 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
365 const struct sockaddr *sa2)
372 * Test if two ip4 socket addresses refer to the same socket, by
373 * comparing relevant fields. The padding bytes specifically, are
376 * The caller should ensure both socket addresses are AF_INET.
378 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
379 const struct sockaddr *sa2)
381 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
382 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
384 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
387 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
388 const struct sockaddr *sa2)
390 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
391 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
393 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
394 (sin1->sin6_port == sin2->sin6_port);
397 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
398 const struct sockaddr *sa2)
400 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
401 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
403 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
404 (sin1->sin_port == sin2->sin_port);
408 * Test if two socket addresses represent the same actual socket,
409 * by comparing (only) relevant fields, excluding the port number.
411 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
412 const struct sockaddr *sa2)
414 if (sa1->sa_family != sa2->sa_family)
417 switch (sa1->sa_family) {
419 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
421 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
427 * Test if two socket addresses represent the same actual socket,
428 * by comparing (only) relevant fields, including the port number.
430 static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
431 const struct sockaddr *sa2)
433 if (sa1->sa_family != sa2->sa_family)
436 switch (sa1->sa_family) {
438 return nfs_sockaddr_cmp_ip4(sa1, sa2);
440 return nfs_sockaddr_cmp_ip6(sa1, sa2);
445 /* Common match routine for v4.0 and v4.1 callback services */
447 nfs4_cb_match_client(const struct sockaddr *addr, struct nfs_client *clp,
450 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
452 /* Don't match clients that failed to initialise */
453 if (!(clp->cl_cons_state == NFS_CS_READY ||
454 clp->cl_cons_state == NFS_CS_SESSION_INITING))
457 /* Match the version and minorversion */
458 if (clp->rpc_ops->version != 4 ||
459 clp->cl_minorversion != minorversion)
462 /* Match only the IP address, not the port number */
463 if (!nfs_sockaddr_match_ipaddr(addr, clap))
470 * Find an nfs_client on the list that matches the initialisation data
473 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
475 struct nfs_client *clp;
476 const struct sockaddr *sap = data->addr;
477 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
479 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
480 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
481 /* Don't match clients that failed to initialise properly */
482 if (clp->cl_cons_state < 0)
485 /* Different NFS versions cannot share the same nfs_client */
486 if (clp->rpc_ops != data->rpc_ops)
489 if (clp->cl_proto != data->proto)
491 /* Match nfsv4 minorversion */
492 if (clp->cl_minorversion != data->minorversion)
494 /* Match the full socket address */
495 if (!nfs_sockaddr_cmp(sap, clap))
498 atomic_inc(&clp->cl_count);
505 * Look up a client by IP address and protocol version
506 * - creates a new record if one doesn't yet exist
508 static struct nfs_client *
509 nfs_get_client(const struct nfs_client_initdata *cl_init,
510 const struct rpc_timeout *timeparms,
512 rpc_authflavor_t authflavour,
515 struct nfs_client *clp, *new = NULL;
517 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
519 dprintk("--> nfs_get_client(%s,v%u)\n",
520 cl_init->hostname ?: "", cl_init->rpc_ops->version);
522 /* see if the client already exists */
524 spin_lock(&nn->nfs_client_lock);
526 clp = nfs_match_client(cl_init);
532 spin_unlock(&nn->nfs_client_lock);
534 new = nfs_alloc_client(cl_init);
535 } while (!IS_ERR(new));
537 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
540 /* install a new client and return with it unready */
543 list_add(&clp->cl_share_link, &nn->nfs_client_list);
544 spin_unlock(&nn->nfs_client_lock);
546 error = cl_init->rpc_ops->init_client(clp, timeparms, ip_addr,
547 authflavour, noresvport);
550 return ERR_PTR(error);
552 dprintk("--> nfs_get_client() = %p [new]\n", clp);
555 /* found an existing client
556 * - make sure it's ready before returning
559 spin_unlock(&nn->nfs_client_lock);
562 nfs_free_client(new);
564 error = wait_event_killable(nfs_client_active_wq,
565 clp->cl_cons_state < NFS_CS_INITING);
568 return ERR_PTR(-ERESTARTSYS);
571 if (clp->cl_cons_state < NFS_CS_READY) {
572 error = clp->cl_cons_state;
574 return ERR_PTR(error);
577 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
579 dprintk("--> nfs_get_client() = %p [share]\n", clp);
584 * Mark a server as ready or failed
586 void nfs_mark_client_ready(struct nfs_client *clp, int state)
588 clp->cl_cons_state = state;
589 wake_up_all(&nfs_client_active_wq);
593 * With sessions, the client is not marked ready until after a
594 * successful EXCHANGE_ID and CREATE_SESSION.
596 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
597 * other versions of NFS can be tried.
599 int nfs4_check_client_ready(struct nfs_client *clp)
601 if (!nfs4_has_session(clp))
603 if (clp->cl_cons_state < NFS_CS_READY)
604 return -EPROTONOSUPPORT;
609 * Initialise the timeout values for a connection
611 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
612 unsigned int timeo, unsigned int retrans)
614 to->to_initval = timeo * HZ / 10;
615 to->to_retries = retrans;
618 case XPRT_TRANSPORT_TCP:
619 case XPRT_TRANSPORT_RDMA:
620 if (to->to_retries == 0)
621 to->to_retries = NFS_DEF_TCP_RETRANS;
622 if (to->to_initval == 0)
623 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
624 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
625 to->to_initval = NFS_MAX_TCP_TIMEOUT;
626 to->to_increment = to->to_initval;
627 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
628 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
629 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
630 if (to->to_maxval < to->to_initval)
631 to->to_maxval = to->to_initval;
632 to->to_exponential = 0;
634 case XPRT_TRANSPORT_UDP:
635 if (to->to_retries == 0)
636 to->to_retries = NFS_DEF_UDP_RETRANS;
638 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
639 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
640 to->to_initval = NFS_MAX_UDP_TIMEOUT;
641 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
642 to->to_exponential = 1;
650 * Create an RPC client handle
652 static int nfs_create_rpc_client(struct nfs_client *clp,
653 const struct rpc_timeout *timeparms,
654 rpc_authflavor_t flavor,
655 int discrtry, int noresvport)
657 struct rpc_clnt *clnt = NULL;
658 struct rpc_create_args args = {
660 .protocol = clp->cl_proto,
661 .address = (struct sockaddr *)&clp->cl_addr,
662 .addrsize = clp->cl_addrlen,
663 .timeout = timeparms,
664 .servername = clp->cl_hostname,
665 .program = &nfs_program,
666 .version = clp->rpc_ops->version,
667 .authflavor = flavor,
671 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
673 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
675 if (!IS_ERR(clp->cl_rpcclient))
678 clnt = rpc_create(&args);
680 dprintk("%s: cannot create RPC client. Error = %ld\n",
681 __func__, PTR_ERR(clnt));
682 return PTR_ERR(clnt);
685 clp->cl_rpcclient = clnt;
690 * Version 2 or 3 client destruction
692 static void nfs_destroy_server(struct nfs_server *server)
694 if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) ||
695 !(server->flags & NFS_MOUNT_LOCAL_FCNTL))
696 nlmclnt_done(server->nlm_host);
700 * Version 2 or 3 lockd setup
702 static int nfs_start_lockd(struct nfs_server *server)
704 struct nlm_host *host;
705 struct nfs_client *clp = server->nfs_client;
706 struct nlmclnt_initdata nlm_init = {
707 .hostname = clp->cl_hostname,
708 .address = (struct sockaddr *)&clp->cl_addr,
709 .addrlen = clp->cl_addrlen,
710 .nfs_version = clp->rpc_ops->version,
711 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
716 if (nlm_init.nfs_version > 3)
718 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
719 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
722 switch (clp->cl_proto) {
724 nlm_init.protocol = IPPROTO_TCP;
726 case XPRT_TRANSPORT_UDP:
727 nlm_init.protocol = IPPROTO_UDP;
730 host = nlmclnt_init(&nlm_init);
732 return PTR_ERR(host);
734 server->nlm_host = host;
735 server->destroy = nfs_destroy_server;
740 * Initialise an NFSv3 ACL client connection
742 #ifdef CONFIG_NFS_V3_ACL
743 static void nfs_init_server_aclclient(struct nfs_server *server)
745 if (server->nfs_client->rpc_ops->version != 3)
747 if (server->flags & NFS_MOUNT_NOACL)
750 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
751 if (IS_ERR(server->client_acl))
754 /* No errors! Assume that Sun nfsacls are supported */
755 server->caps |= NFS_CAP_ACLS;
759 server->caps &= ~NFS_CAP_ACLS;
762 static inline void nfs_init_server_aclclient(struct nfs_server *server)
764 server->flags &= ~NFS_MOUNT_NOACL;
765 server->caps &= ~NFS_CAP_ACLS;
770 * Create a general RPC client
772 static int nfs_init_server_rpcclient(struct nfs_server *server,
773 const struct rpc_timeout *timeo,
774 rpc_authflavor_t pseudoflavour)
776 struct nfs_client *clp = server->nfs_client;
778 server->client = rpc_clone_client(clp->cl_rpcclient);
779 if (IS_ERR(server->client)) {
780 dprintk("%s: couldn't create rpc_client!\n", __func__);
781 return PTR_ERR(server->client);
784 memcpy(&server->client->cl_timeout_default,
786 sizeof(server->client->cl_timeout_default));
787 server->client->cl_timeout = &server->client->cl_timeout_default;
789 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
790 struct rpc_auth *auth;
792 auth = rpcauth_create(pseudoflavour, server->client);
794 dprintk("%s: couldn't create credcache!\n", __func__);
795 return PTR_ERR(auth);
798 server->client->cl_softrtry = 0;
799 if (server->flags & NFS_MOUNT_SOFT)
800 server->client->cl_softrtry = 1;
806 * Initialise an NFS2 or NFS3 client
808 int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms,
809 const char *ip_addr, rpc_authflavor_t authflavour,
814 if (clp->cl_cons_state == NFS_CS_READY) {
815 /* the client is already initialised */
816 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
821 * Create a client RPC handle for doing FSSTAT with UNIX auth only
822 * - RFC 2623, sec 2.3.2
824 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
828 nfs_mark_client_ready(clp, NFS_CS_READY);
832 nfs_mark_client_ready(clp, error);
833 dprintk("<-- nfs_init_client() = xerror %d\n", error);
838 * Create a version 2 or 3 client
840 static int nfs_init_server(struct nfs_server *server,
841 const struct nfs_parsed_mount_data *data)
843 struct nfs_client_initdata cl_init = {
844 .hostname = data->nfs_server.hostname,
845 .addr = (const struct sockaddr *)&data->nfs_server.address,
846 .addrlen = data->nfs_server.addrlen,
847 .rpc_ops = &nfs_v2_clientops,
848 .proto = data->nfs_server.protocol,
851 struct rpc_timeout timeparms;
852 struct nfs_client *clp;
855 dprintk("--> nfs_init_server()\n");
858 if (data->version == 3)
859 cl_init.rpc_ops = &nfs_v3_clientops;
862 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
863 data->timeo, data->retrans);
865 /* Allocate or find a client reference we can use */
866 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX,
867 data->flags & NFS_MOUNT_NORESVPORT);
869 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
873 server->nfs_client = clp;
875 /* Initialise the client representation from the mount data */
876 server->flags = data->flags;
877 server->options = data->options;
878 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
879 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
880 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
883 server->rsize = nfs_block_size(data->rsize, NULL);
885 server->wsize = nfs_block_size(data->wsize, NULL);
887 server->acregmin = data->acregmin * HZ;
888 server->acregmax = data->acregmax * HZ;
889 server->acdirmin = data->acdirmin * HZ;
890 server->acdirmax = data->acdirmax * HZ;
892 /* Start lockd here, before we might error out */
893 error = nfs_start_lockd(server);
897 server->port = data->nfs_server.port;
899 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
903 /* Preserve the values of mount_server-related mount options */
904 if (data->mount_server.addrlen) {
905 memcpy(&server->mountd_address, &data->mount_server.address,
906 data->mount_server.addrlen);
907 server->mountd_addrlen = data->mount_server.addrlen;
909 server->mountd_version = data->mount_server.version;
910 server->mountd_port = data->mount_server.port;
911 server->mountd_protocol = data->mount_server.protocol;
913 server->namelen = data->namlen;
914 /* Create a client RPC handle for the NFSv3 ACL management interface */
915 nfs_init_server_aclclient(server);
916 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
920 server->nfs_client = NULL;
922 dprintk("<-- nfs_init_server() = xerror %d\n", error);
927 * Load up the server record from information gained in an fsinfo record
929 static void nfs_server_set_fsinfo(struct nfs_server *server,
930 struct nfs_fh *mntfh,
931 struct nfs_fsinfo *fsinfo)
933 unsigned long max_rpc_payload;
935 /* Work out a lot of parameters */
936 if (server->rsize == 0)
937 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
938 if (server->wsize == 0)
939 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
941 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
942 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
943 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
944 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
946 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
947 if (server->rsize > max_rpc_payload)
948 server->rsize = max_rpc_payload;
949 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
950 server->rsize = NFS_MAX_FILE_IO_SIZE;
951 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
953 server->backing_dev_info.name = "nfs";
954 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
956 if (server->wsize > max_rpc_payload)
957 server->wsize = max_rpc_payload;
958 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
959 server->wsize = NFS_MAX_FILE_IO_SIZE;
960 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
961 server->pnfs_blksize = fsinfo->blksize;
962 set_pnfs_layoutdriver(server, mntfh, fsinfo->layouttype);
964 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
966 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
967 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
968 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
969 if (server->dtsize > server->rsize)
970 server->dtsize = server->rsize;
972 if (server->flags & NFS_MOUNT_NOAC) {
973 server->acregmin = server->acregmax = 0;
974 server->acdirmin = server->acdirmax = 0;
977 server->maxfilesize = fsinfo->maxfilesize;
979 server->time_delta = fsinfo->time_delta;
981 /* We're airborne Set socket buffersize */
982 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
986 * Probe filesystem information, including the FSID on v2/v3
988 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
990 struct nfs_fsinfo fsinfo;
991 struct nfs_client *clp = server->nfs_client;
994 dprintk("--> nfs_probe_fsinfo()\n");
996 if (clp->rpc_ops->set_capabilities != NULL) {
997 error = clp->rpc_ops->set_capabilities(server, mntfh);
1002 fsinfo.fattr = fattr;
1003 fsinfo.layouttype = 0;
1004 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
1008 nfs_server_set_fsinfo(server, mntfh, &fsinfo);
1010 /* Get some general file system info */
1011 if (server->namelen == 0) {
1012 struct nfs_pathconf pathinfo;
1014 pathinfo.fattr = fattr;
1015 nfs_fattr_init(fattr);
1017 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
1018 server->namelen = pathinfo.max_namelen;
1021 dprintk("<-- nfs_probe_fsinfo() = 0\n");
1025 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
1030 * Copy useful information when duplicating a server record
1032 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
1034 target->flags = source->flags;
1035 target->rsize = source->rsize;
1036 target->wsize = source->wsize;
1037 target->acregmin = source->acregmin;
1038 target->acregmax = source->acregmax;
1039 target->acdirmin = source->acdirmin;
1040 target->acdirmax = source->acdirmax;
1041 target->caps = source->caps;
1042 target->options = source->options;
1045 static void nfs_server_insert_lists(struct nfs_server *server)
1047 struct nfs_client *clp = server->nfs_client;
1048 struct nfs_net *nn = net_generic(clp->net, nfs_net_id);
1050 spin_lock(&nn->nfs_client_lock);
1051 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
1052 list_add_tail(&server->master_link, &nn->nfs_volume_list);
1053 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
1054 spin_unlock(&nn->nfs_client_lock);
1058 static void nfs_server_remove_lists(struct nfs_server *server)
1060 struct nfs_client *clp = server->nfs_client;
1065 nn = net_generic(clp->net, nfs_net_id);
1066 spin_lock(&nn->nfs_client_lock);
1067 list_del_rcu(&server->client_link);
1068 if (list_empty(&clp->cl_superblocks))
1069 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
1070 list_del(&server->master_link);
1071 spin_unlock(&nn->nfs_client_lock);
1077 * Allocate and initialise a server record
1079 static struct nfs_server *nfs_alloc_server(void)
1081 struct nfs_server *server;
1083 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
1087 server->client = server->client_acl = ERR_PTR(-EINVAL);
1089 /* Zero out the NFS state stuff */
1090 INIT_LIST_HEAD(&server->client_link);
1091 INIT_LIST_HEAD(&server->master_link);
1092 INIT_LIST_HEAD(&server->delegations);
1093 INIT_LIST_HEAD(&server->layouts);
1094 INIT_LIST_HEAD(&server->state_owners_lru);
1096 atomic_set(&server->active, 0);
1098 server->io_stats = nfs_alloc_iostats();
1099 if (!server->io_stats) {
1104 if (bdi_init(&server->backing_dev_info)) {
1105 nfs_free_iostats(server->io_stats);
1110 ida_init(&server->openowner_id);
1111 ida_init(&server->lockowner_id);
1112 pnfs_init_server(server);
1118 * Free up a server record
1120 void nfs_free_server(struct nfs_server *server)
1122 dprintk("--> nfs_free_server()\n");
1124 nfs_server_remove_lists(server);
1125 unset_pnfs_layoutdriver(server);
1127 if (server->destroy != NULL)
1128 server->destroy(server);
1130 if (!IS_ERR(server->client_acl))
1131 rpc_shutdown_client(server->client_acl);
1132 if (!IS_ERR(server->client))
1133 rpc_shutdown_client(server->client);
1135 nfs_put_client(server->nfs_client);
1137 ida_destroy(&server->lockowner_id);
1138 ida_destroy(&server->openowner_id);
1139 nfs_free_iostats(server->io_stats);
1140 bdi_destroy(&server->backing_dev_info);
1142 nfs_release_automount_timer();
1143 dprintk("<-- nfs_free_server()\n");
1147 * Create a version 2 or 3 volume record
1148 * - keyed on server and FSID
1150 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1151 struct nfs_fh *mntfh)
1153 struct nfs_server *server;
1154 struct nfs_fattr *fattr;
1157 server = nfs_alloc_server();
1159 return ERR_PTR(-ENOMEM);
1162 fattr = nfs_alloc_fattr();
1166 /* Get a client representation */
1167 error = nfs_init_server(server, data);
1171 BUG_ON(!server->nfs_client);
1172 BUG_ON(!server->nfs_client->rpc_ops);
1173 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1175 /* Probe the root fh to retrieve its FSID */
1176 error = nfs_probe_fsinfo(server, mntfh, fattr);
1179 if (server->nfs_client->rpc_ops->version == 3) {
1180 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1181 server->namelen = NFS3_MAXNAMLEN;
1182 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1183 server->caps |= NFS_CAP_READDIRPLUS;
1185 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1186 server->namelen = NFS2_MAXNAMLEN;
1189 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1190 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
1192 dprintk("nfs_create_server: getattr error = %d\n", -error);
1196 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1198 dprintk("Server FSID: %llx:%llx\n",
1199 (unsigned long long) server->fsid.major,
1200 (unsigned long long) server->fsid.minor);
1202 nfs_server_insert_lists(server);
1203 server->mount_time = jiffies;
1204 nfs_free_fattr(fattr);
1208 nfs_free_fattr(fattr);
1209 nfs_free_server(server);
1210 return ERR_PTR(error);
1213 #ifdef CONFIG_NFS_V4
1215 * NFSv4.0 callback thread helper
1217 * Find a client by callback identifier
1220 nfs4_find_client_ident(struct net *net, int cb_ident)
1222 struct nfs_client *clp;
1223 struct nfs_net *nn = net_generic(net, nfs_net_id);
1225 spin_lock(&nn->nfs_client_lock);
1226 clp = idr_find(&nn->cb_ident_idr, cb_ident);
1228 atomic_inc(&clp->cl_count);
1229 spin_unlock(&nn->nfs_client_lock);
1233 #if defined(CONFIG_NFS_V4_1)
1235 * NFSv4.1 callback thread helper
1236 * For CB_COMPOUND calls, find a client by IP address, protocol version,
1237 * minorversion, and sessionID
1239 * Returns NULL if no such client
1242 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
1243 struct nfs4_sessionid *sid)
1245 struct nfs_client *clp;
1246 struct nfs_net *nn = net_generic(net, nfs_net_id);
1248 spin_lock(&nn->nfs_client_lock);
1249 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
1250 if (nfs4_cb_match_client(addr, clp, 1) == false)
1253 if (!nfs4_has_session(clp))
1256 /* Match sessionid*/
1257 if (memcmp(clp->cl_session->sess_id.data,
1258 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
1261 atomic_inc(&clp->cl_count);
1262 spin_unlock(&nn->nfs_client_lock);
1265 spin_unlock(&nn->nfs_client_lock);
1269 #else /* CONFIG_NFS_V4_1 */
1272 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
1273 struct nfs4_sessionid *sid)
1277 #endif /* CONFIG_NFS_V4_1 */
1280 * Initialize the NFS4 callback service
1282 static int nfs4_init_callback(struct nfs_client *clp)
1286 if (clp->rpc_ops->version == 4) {
1287 if (nfs4_has_session(clp)) {
1288 error = xprt_setup_backchannel(
1289 clp->cl_rpcclient->cl_xprt,
1290 NFS41_BC_MIN_CALLBACKS);
1295 error = nfs_callback_up(clp->cl_mvops->minor_version,
1296 clp->cl_rpcclient->cl_xprt);
1298 dprintk("%s: failed to start callback. Error = %d\n",
1302 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
1308 * Initialize the minor version specific parts of an NFS4 client record
1310 static int nfs4_init_client_minor_version(struct nfs_client *clp)
1312 #if defined(CONFIG_NFS_V4_1)
1313 if (clp->cl_mvops->minor_version) {
1314 struct nfs4_session *session = NULL;
1316 * Create the session and mark it expired.
1317 * When a SEQUENCE operation encounters the expired session
1318 * it will do session recovery to initialize it.
1320 session = nfs4_alloc_session(clp);
1324 clp->cl_session = session;
1326 * The create session reply races with the server back
1327 * channel probe. Mark the client NFS_CS_SESSION_INITING
1328 * so that the client back channel can find the
1331 clp->cl_cons_state = NFS_CS_SESSION_INITING;
1333 #endif /* CONFIG_NFS_V4_1 */
1335 return nfs4_init_callback(clp);
1339 * Initialise an NFS4 client record
1341 int nfs4_init_client(struct nfs_client *clp,
1342 const struct rpc_timeout *timeparms,
1343 const char *ip_addr,
1344 rpc_authflavor_t authflavour,
1349 if (clp->cl_cons_state == NFS_CS_READY) {
1350 /* the client is initialised already */
1351 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1355 /* Check NFS protocol revision and initialize RPC op vector */
1356 clp->rpc_ops = &nfs_v4_clientops;
1358 error = nfs_create_rpc_client(clp, timeparms, authflavour,
1362 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1364 error = nfs_idmap_new(clp);
1366 dprintk("%s: failed to create idmapper. Error = %d\n",
1370 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1372 error = nfs4_init_client_minor_version(clp);
1376 if (!nfs4_has_session(clp))
1377 nfs_mark_client_ready(clp, NFS_CS_READY);
1381 nfs_mark_client_ready(clp, error);
1382 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1387 * Set up an NFS4 client
1389 static int nfs4_set_client(struct nfs_server *server,
1390 const char *hostname,
1391 const struct sockaddr *addr,
1392 const size_t addrlen,
1393 const char *ip_addr,
1394 rpc_authflavor_t authflavour,
1395 int proto, const struct rpc_timeout *timeparms,
1396 u32 minorversion, struct net *net)
1398 struct nfs_client_initdata cl_init = {
1399 .hostname = hostname,
1402 .rpc_ops = &nfs_v4_clientops,
1404 .minorversion = minorversion,
1407 struct nfs_client *clp;
1410 dprintk("--> nfs4_set_client()\n");
1412 /* Allocate or find a client reference we can use */
1413 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour,
1414 server->flags & NFS_MOUNT_NORESVPORT);
1416 error = PTR_ERR(clp);
1421 * Query for the lease time on clientid setup or renewal
1423 * Note that this will be set on nfs_clients that were created
1424 * only for the DS role and did not set this bit, but now will
1425 * serve a dual role.
1427 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
1429 server->nfs_client = clp;
1430 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1433 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1438 * Set up a pNFS Data Server client.
1440 * Return any existing nfs_client that matches server address,port,version
1443 * For a new nfs_client, use a soft mount (default), a low retrans and a
1444 * low timeout interval so that if a connection is lost, we retry through
1447 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
1448 const struct sockaddr *ds_addr,
1449 int ds_addrlen, int ds_proto)
1451 struct nfs_client_initdata cl_init = {
1453 .addrlen = ds_addrlen,
1454 .rpc_ops = &nfs_v4_clientops,
1456 .minorversion = mds_clp->cl_minorversion,
1457 .net = mds_clp->net,
1459 struct rpc_timeout ds_timeout = {
1460 .to_initval = 15 * HZ,
1461 .to_maxval = 15 * HZ,
1463 .to_exponential = 1,
1465 struct nfs_client *clp;
1468 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
1469 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
1470 * (section 13.1 RFC 5661).
1472 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
1473 mds_clp->cl_rpcclient->cl_auth->au_flavor, 0);
1475 dprintk("<-- %s %p\n", __func__, clp);
1478 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
1481 * Session has been established, and the client marked ready.
1482 * Set the mount rsize and wsize with negotiated fore channel
1483 * attributes which will be bound checked in nfs_server_set_fsinfo.
1485 static void nfs4_session_set_rwsize(struct nfs_server *server)
1487 #ifdef CONFIG_NFS_V4_1
1488 struct nfs4_session *sess;
1492 if (!nfs4_has_session(server->nfs_client))
1494 sess = server->nfs_client->cl_session;
1495 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1496 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1498 if (server->rsize > server_resp_sz)
1499 server->rsize = server_resp_sz;
1500 if (server->wsize > server_rqst_sz)
1501 server->wsize = server_rqst_sz;
1502 #endif /* CONFIG_NFS_V4_1 */
1505 static int nfs4_server_common_setup(struct nfs_server *server,
1506 struct nfs_fh *mntfh)
1508 struct nfs_fattr *fattr;
1511 BUG_ON(!server->nfs_client);
1512 BUG_ON(!server->nfs_client->rpc_ops);
1513 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1515 /* data servers support only a subset of NFSv4.1 */
1516 if (is_ds_only_client(server->nfs_client))
1517 return -EPROTONOSUPPORT;
1519 fattr = nfs_alloc_fattr();
1523 /* We must ensure the session is initialised first */
1524 error = nfs4_init_session(server);
1528 /* Probe the root fh to retrieve its FSID and filehandle */
1529 error = nfs4_get_rootfh(server, mntfh);
1533 dprintk("Server FSID: %llx:%llx\n",
1534 (unsigned long long) server->fsid.major,
1535 (unsigned long long) server->fsid.minor);
1536 dprintk("Mount FH: %d\n", mntfh->size);
1538 nfs4_session_set_rwsize(server);
1540 error = nfs_probe_fsinfo(server, mntfh, fattr);
1544 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1545 server->namelen = NFS4_MAXNAMLEN;
1547 nfs_server_insert_lists(server);
1548 server->mount_time = jiffies;
1549 server->destroy = nfs4_destroy_server;
1551 nfs_free_fattr(fattr);
1556 * Create a version 4 volume record
1558 static int nfs4_init_server(struct nfs_server *server,
1559 const struct nfs_parsed_mount_data *data)
1561 struct rpc_timeout timeparms;
1564 dprintk("--> nfs4_init_server()\n");
1566 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1567 data->timeo, data->retrans);
1569 /* Initialise the client representation from the mount data */
1570 server->flags = data->flags;
1571 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
1572 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1573 server->caps |= NFS_CAP_READDIRPLUS;
1574 server->options = data->options;
1576 /* Get a client record */
1577 error = nfs4_set_client(server,
1578 data->nfs_server.hostname,
1579 (const struct sockaddr *)&data->nfs_server.address,
1580 data->nfs_server.addrlen,
1581 data->client_address,
1582 data->auth_flavors[0],
1583 data->nfs_server.protocol,
1591 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
1594 if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX)
1595 server->caps |= NFS_CAP_UIDGID_NOMAP;
1598 server->rsize = nfs_block_size(data->rsize, NULL);
1600 server->wsize = nfs_block_size(data->wsize, NULL);
1602 server->acregmin = data->acregmin * HZ;
1603 server->acregmax = data->acregmax * HZ;
1604 server->acdirmin = data->acdirmin * HZ;
1605 server->acdirmax = data->acdirmax * HZ;
1607 server->port = data->nfs_server.port;
1609 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1613 dprintk("<-- nfs4_init_server() = %d\n", error);
1618 * Create a version 4 volume record
1619 * - keyed on server and FSID
1621 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1622 struct nfs_fh *mntfh)
1624 struct nfs_server *server;
1627 dprintk("--> nfs4_create_server()\n");
1629 server = nfs_alloc_server();
1631 return ERR_PTR(-ENOMEM);
1633 /* set up the general RPC client */
1634 error = nfs4_init_server(server, data);
1638 error = nfs4_server_common_setup(server, mntfh);
1642 dprintk("<-- nfs4_create_server() = %p\n", server);
1646 nfs_free_server(server);
1647 dprintk("<-- nfs4_create_server() = error %d\n", error);
1648 return ERR_PTR(error);
1652 * Create an NFS4 referral server record
1654 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1655 struct nfs_fh *mntfh)
1657 struct nfs_client *parent_client;
1658 struct nfs_server *server, *parent_server;
1661 dprintk("--> nfs4_create_referral_server()\n");
1663 server = nfs_alloc_server();
1665 return ERR_PTR(-ENOMEM);
1667 parent_server = NFS_SB(data->sb);
1668 parent_client = parent_server->nfs_client;
1670 /* Initialise the client representation from the parent server */
1671 nfs_server_copy_userdata(server, parent_server);
1672 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1674 /* Get a client representation.
1675 * Note: NFSv4 always uses TCP, */
1676 error = nfs4_set_client(server, data->hostname,
1679 parent_client->cl_ipaddr,
1681 parent_server->client->cl_xprt->prot,
1682 parent_server->client->cl_timeout,
1683 parent_client->cl_mvops->minor_version,
1684 parent_client->net);
1688 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1692 error = nfs4_server_common_setup(server, mntfh);
1696 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1700 nfs_free_server(server);
1701 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1702 return ERR_PTR(error);
1705 #endif /* CONFIG_NFS_V4 */
1708 * Clone an NFS2, NFS3 or NFS4 server record
1710 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1712 struct nfs_fattr *fattr)
1714 struct nfs_server *server;
1715 struct nfs_fattr *fattr_fsinfo;
1718 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1719 (unsigned long long) fattr->fsid.major,
1720 (unsigned long long) fattr->fsid.minor);
1722 server = nfs_alloc_server();
1724 return ERR_PTR(-ENOMEM);
1727 fattr_fsinfo = nfs_alloc_fattr();
1728 if (fattr_fsinfo == NULL)
1729 goto out_free_server;
1731 /* Copy data from the source */
1732 server->nfs_client = source->nfs_client;
1733 server->destroy = source->destroy;
1734 atomic_inc(&server->nfs_client->cl_count);
1735 nfs_server_copy_userdata(server, source);
1737 server->fsid = fattr->fsid;
1739 error = nfs_init_server_rpcclient(server,
1740 source->client->cl_timeout,
1741 source->client->cl_auth->au_flavor);
1743 goto out_free_server;
1744 if (!IS_ERR(source->client_acl))
1745 nfs_init_server_aclclient(server);
1747 /* probe the filesystem info for this server filesystem */
1748 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1750 goto out_free_server;
1752 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1753 server->namelen = NFS4_MAXNAMLEN;
1755 dprintk("Cloned FSID: %llx:%llx\n",
1756 (unsigned long long) server->fsid.major,
1757 (unsigned long long) server->fsid.minor);
1759 error = nfs_start_lockd(server);
1761 goto out_free_server;
1763 nfs_server_insert_lists(server);
1764 server->mount_time = jiffies;
1766 nfs_free_fattr(fattr_fsinfo);
1767 dprintk("<-- nfs_clone_server() = %p\n", server);
1771 nfs_free_fattr(fattr_fsinfo);
1772 nfs_free_server(server);
1773 dprintk("<-- nfs_clone_server() = error %d\n", error);
1774 return ERR_PTR(error);
1777 void nfs_clients_init(struct net *net)
1779 struct nfs_net *nn = net_generic(net, nfs_net_id);
1781 INIT_LIST_HEAD(&nn->nfs_client_list);
1782 INIT_LIST_HEAD(&nn->nfs_volume_list);
1783 #ifdef CONFIG_NFS_V4
1784 idr_init(&nn->cb_ident_idr);
1786 spin_lock_init(&nn->nfs_client_lock);
1789 #ifdef CONFIG_PROC_FS
1790 static struct proc_dir_entry *proc_fs_nfs;
1792 static int nfs_server_list_open(struct inode *inode, struct file *file);
1793 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1794 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1795 static void nfs_server_list_stop(struct seq_file *p, void *v);
1796 static int nfs_server_list_show(struct seq_file *m, void *v);
1798 static const struct seq_operations nfs_server_list_ops = {
1799 .start = nfs_server_list_start,
1800 .next = nfs_server_list_next,
1801 .stop = nfs_server_list_stop,
1802 .show = nfs_server_list_show,
1805 static const struct file_operations nfs_server_list_fops = {
1806 .open = nfs_server_list_open,
1808 .llseek = seq_lseek,
1809 .release = seq_release,
1810 .owner = THIS_MODULE,
1813 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1814 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1815 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1816 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1817 static int nfs_volume_list_show(struct seq_file *m, void *v);
1819 static const struct seq_operations nfs_volume_list_ops = {
1820 .start = nfs_volume_list_start,
1821 .next = nfs_volume_list_next,
1822 .stop = nfs_volume_list_stop,
1823 .show = nfs_volume_list_show,
1826 static const struct file_operations nfs_volume_list_fops = {
1827 .open = nfs_volume_list_open,
1829 .llseek = seq_lseek,
1830 .release = seq_release,
1831 .owner = THIS_MODULE,
1835 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1838 static int nfs_server_list_open(struct inode *inode, struct file *file)
1842 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
1843 struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1845 ret = seq_open(file, &nfs_server_list_ops);
1849 m = file->private_data;
1856 * set up the iterator to start reading from the server list and return the first item
1858 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1860 struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1862 /* lock the list against modification */
1863 spin_lock(&nn->nfs_client_lock);
1864 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1868 * move to next server
1870 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1872 struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1874 return seq_list_next(v, &nn->nfs_client_list, pos);
1878 * clean up after reading from the transports list
1880 static void nfs_server_list_stop(struct seq_file *p, void *v)
1882 struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1884 spin_unlock(&nn->nfs_client_lock);
1888 * display a header line followed by a load of call lines
1890 static int nfs_server_list_show(struct seq_file *m, void *v)
1892 struct nfs_client *clp;
1893 struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1895 /* display header on line 1 */
1896 if (v == &nn->nfs_client_list) {
1897 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1901 /* display one transport per line on subsequent lines */
1902 clp = list_entry(v, struct nfs_client, cl_share_link);
1904 /* Check if the client is initialized */
1905 if (clp->cl_cons_state != NFS_CS_READY)
1908 seq_printf(m, "v%u %s %s %3d %s\n",
1909 clp->rpc_ops->version,
1910 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1911 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1912 atomic_read(&clp->cl_count),
1919 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1921 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1925 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
1926 struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1928 ret = seq_open(file, &nfs_volume_list_ops);
1932 m = file->private_data;
1939 * set up the iterator to start reading from the volume list and return the first item
1941 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1943 struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1945 /* lock the list against modification */
1946 spin_lock(&nn->nfs_client_lock);
1947 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1951 * move to next volume
1953 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1955 struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1957 return seq_list_next(v, &nn->nfs_volume_list, pos);
1961 * clean up after reading from the transports list
1963 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1965 struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1967 spin_unlock(&nn->nfs_client_lock);
1971 * display a header line followed by a load of call lines
1973 static int nfs_volume_list_show(struct seq_file *m, void *v)
1975 struct nfs_server *server;
1976 struct nfs_client *clp;
1977 char dev[8], fsid[17];
1978 struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1980 /* display header on line 1 */
1981 if (v == &nn->nfs_volume_list) {
1982 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
1985 /* display one transport per line on subsequent lines */
1986 server = list_entry(v, struct nfs_server, master_link);
1987 clp = server->nfs_client;
1989 snprintf(dev, 8, "%u:%u",
1990 MAJOR(server->s_dev), MINOR(server->s_dev));
1992 snprintf(fsid, 17, "%llx:%llx",
1993 (unsigned long long) server->fsid.major,
1994 (unsigned long long) server->fsid.minor);
1996 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1997 clp->rpc_ops->version,
1998 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1999 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
2002 nfs_server_fscache_state(server));
2008 * initialise the /proc/fs/nfsfs/ directory
2010 int __init nfs_fs_proc_init(void)
2012 struct proc_dir_entry *p;
2014 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
2018 /* a file of servers with which we're dealing */
2019 p = proc_create("servers", S_IFREG|S_IRUGO,
2020 proc_fs_nfs, &nfs_server_list_fops);
2024 /* a file of volumes that we have mounted */
2025 p = proc_create("volumes", S_IFREG|S_IRUGO,
2026 proc_fs_nfs, &nfs_volume_list_fops);
2032 remove_proc_entry("servers", proc_fs_nfs);
2034 remove_proc_entry("fs/nfsfs", NULL);
2040 * clean up the /proc/fs/nfsfs/ directory
2042 void nfs_fs_proc_exit(void)
2044 remove_proc_entry("volumes", proc_fs_nfs);
2045 remove_proc_entry("servers", proc_fs_nfs);
2046 remove_proc_entry("fs/nfsfs", NULL);
2049 #endif /* CONFIG_PROC_FS */
2051 module_param(nfs4_disable_idmapping, bool, 0644);
2052 MODULE_PARM_DESC(nfs4_disable_idmapping,
2053 "Turn off NFSv4 idmapping when using 'sec=sys'");