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>
43 #include <asm/system.h>
47 #include "delegation.h"
52 #define NFSDBG_FACILITY NFSDBG_CLIENT
54 static DEFINE_SPINLOCK(nfs_client_lock);
55 static LIST_HEAD(nfs_client_list);
56 static LIST_HEAD(nfs_volume_list);
57 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
62 static struct rpc_version *nfs_version[5] = {
72 struct rpc_program nfs_program = {
74 .number = NFS_PROGRAM,
75 .nrvers = ARRAY_SIZE(nfs_version),
76 .version = nfs_version,
77 .stats = &nfs_rpcstat,
78 .pipe_dir_name = "/nfs",
81 struct rpc_stat nfs_rpcstat = {
82 .program = &nfs_program
86 #ifdef CONFIG_NFS_V3_ACL
87 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
88 static struct rpc_version * nfsacl_version[] = {
89 [3] = &nfsacl_version3,
92 struct rpc_program nfsacl_program = {
94 .number = NFS_ACL_PROGRAM,
95 .nrvers = ARRAY_SIZE(nfsacl_version),
96 .version = nfsacl_version,
97 .stats = &nfsacl_rpcstat,
99 #endif /* CONFIG_NFS_V3_ACL */
101 struct nfs_client_initdata {
102 const char *hostname;
103 const struct sockaddr *addr;
105 const struct nfs_rpc_ops *rpc_ops;
111 * Allocate a shared client record
113 * Since these are allocated/deallocated very rarely, we don't
114 * bother putting them in a slab cache...
116 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
118 struct nfs_client *clp;
119 struct rpc_cred *cred;
122 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
125 clp->rpc_ops = cl_init->rpc_ops;
127 atomic_set(&clp->cl_count, 1);
128 clp->cl_cons_state = NFS_CS_INITING;
130 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
131 clp->cl_addrlen = cl_init->addrlen;
133 if (cl_init->hostname) {
135 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
136 if (!clp->cl_hostname)
140 INIT_LIST_HEAD(&clp->cl_superblocks);
141 clp->cl_rpcclient = ERR_PTR(-EINVAL);
143 clp->cl_proto = cl_init->proto;
146 INIT_LIST_HEAD(&clp->cl_delegations);
147 spin_lock_init(&clp->cl_lock);
148 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
149 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
150 clp->cl_boot_time = CURRENT_TIME;
151 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
152 clp->cl_minorversion = cl_init->minorversion;
153 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
155 cred = rpc_lookup_machine_cred();
157 clp->cl_machine_cred = cred;
159 nfs_fscache_get_client_cookie(clp);
171 * Clears/puts all minor version specific parts from an nfs_client struct
172 * reverting it to minorversion 0.
174 static void nfs4_clear_client_minor_version(struct nfs_client *clp)
176 #ifdef CONFIG_NFS_V4_1
177 if (nfs4_has_session(clp)) {
178 nfs4_destroy_session(clp->cl_session);
179 clp->cl_session = NULL;
182 clp->cl_mvops = nfs_v4_minor_ops[0];
183 #endif /* CONFIG_NFS_V4_1 */
187 * Destroy the NFS4 callback service
189 static void nfs4_destroy_callback(struct nfs_client *clp)
191 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
192 nfs_callback_down(clp->cl_mvops->minor_version);
195 static void nfs4_shutdown_client(struct nfs_client *clp)
197 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
198 nfs4_kill_renewd(clp);
199 nfs4_clear_client_minor_version(clp);
200 nfs4_destroy_callback(clp);
201 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
202 nfs_idmap_delete(clp);
204 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
207 static void nfs4_shutdown_client(struct nfs_client *clp)
210 #endif /* CONFIG_NFS_V4 */
213 * Destroy a shared client record
215 static void nfs_free_client(struct nfs_client *clp)
217 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
219 nfs4_shutdown_client(clp);
221 nfs_fscache_release_client_cookie(clp);
223 /* -EIO all pending I/O */
224 if (!IS_ERR(clp->cl_rpcclient))
225 rpc_shutdown_client(clp->cl_rpcclient);
227 if (clp->cl_machine_cred != NULL)
228 put_rpccred(clp->cl_machine_cred);
230 kfree(clp->cl_hostname);
233 dprintk("<-- nfs_free_client()\n");
237 * Release a reference to a shared client record
239 void nfs_put_client(struct nfs_client *clp)
244 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
246 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
247 list_del(&clp->cl_share_link);
248 spin_unlock(&nfs_client_lock);
250 BUG_ON(!list_empty(&clp->cl_superblocks));
252 nfs_free_client(clp);
256 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
258 * Test if two ip6 socket addresses refer to the same socket by
259 * comparing relevant fields. The padding bytes specifically, are not
260 * compared. sin6_flowinfo is not compared because it only affects QoS
261 * and sin6_scope_id is only compared if the address is "link local"
262 * because "link local" addresses need only be unique to a specific
263 * link. Conversely, ordinary unicast addresses might have different
266 * The caller should ensure both socket addresses are AF_INET6.
268 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
269 const struct sockaddr *sa2)
271 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
272 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
274 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
275 sin1->sin6_scope_id != sin2->sin6_scope_id)
278 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
280 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
281 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
282 const struct sockaddr *sa2)
289 * Test if two ip4 socket addresses refer to the same socket, by
290 * comparing relevant fields. The padding bytes specifically, are
293 * The caller should ensure both socket addresses are AF_INET.
295 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
296 const struct sockaddr *sa2)
298 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
299 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
301 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
304 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
305 const struct sockaddr *sa2)
307 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
308 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
310 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
311 (sin1->sin6_port == sin2->sin6_port);
314 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
315 const struct sockaddr *sa2)
317 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
318 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
320 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
321 (sin1->sin_port == sin2->sin_port);
325 * Test if two socket addresses represent the same actual socket,
326 * by comparing (only) relevant fields, excluding the port number.
328 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
329 const struct sockaddr *sa2)
331 if (sa1->sa_family != sa2->sa_family)
334 switch (sa1->sa_family) {
336 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
338 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
344 * Test if two socket addresses represent the same actual socket,
345 * by comparing (only) relevant fields, including the port number.
347 static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
348 const struct sockaddr *sa2)
350 if (sa1->sa_family != sa2->sa_family)
353 switch (sa1->sa_family) {
355 return nfs_sockaddr_cmp_ip4(sa1, sa2);
357 return nfs_sockaddr_cmp_ip6(sa1, sa2);
363 * Find a client by IP address and protocol version
364 * - returns NULL if no such client
366 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
368 struct nfs_client *clp;
370 spin_lock(&nfs_client_lock);
371 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
372 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
374 /* Don't match clients that failed to initialise properly */
375 if (!(clp->cl_cons_state == NFS_CS_READY ||
376 clp->cl_cons_state == NFS_CS_SESSION_INITING))
379 /* Different NFS versions cannot share the same nfs_client */
380 if (clp->rpc_ops->version != nfsversion)
383 /* Match only the IP address, not the port number */
384 if (!nfs_sockaddr_match_ipaddr(addr, clap))
387 atomic_inc(&clp->cl_count);
388 spin_unlock(&nfs_client_lock);
391 spin_unlock(&nfs_client_lock);
396 * Find a client by IP address and protocol version
397 * - returns NULL if no such client
399 struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
401 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
402 u32 nfsvers = clp->rpc_ops->version;
404 spin_lock(&nfs_client_lock);
405 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
406 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
408 /* Don't match clients that failed to initialise properly */
409 if (clp->cl_cons_state != NFS_CS_READY)
412 /* Different NFS versions cannot share the same nfs_client */
413 if (clp->rpc_ops->version != nfsvers)
416 /* Match only the IP address, not the port number */
417 if (!nfs_sockaddr_match_ipaddr(sap, clap))
420 atomic_inc(&clp->cl_count);
421 spin_unlock(&nfs_client_lock);
424 spin_unlock(&nfs_client_lock);
429 * Find an nfs_client on the list that matches the initialisation data
432 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
434 struct nfs_client *clp;
435 const struct sockaddr *sap = data->addr;
437 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
438 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
439 /* Don't match clients that failed to initialise properly */
440 if (clp->cl_cons_state < 0)
443 /* Different NFS versions cannot share the same nfs_client */
444 if (clp->rpc_ops != data->rpc_ops)
447 if (clp->cl_proto != data->proto)
449 /* Match nfsv4 minorversion */
450 if (clp->cl_minorversion != data->minorversion)
452 /* Match the full socket address */
453 if (!nfs_sockaddr_cmp(sap, clap))
456 atomic_inc(&clp->cl_count);
463 * Look up a client by IP address and protocol version
464 * - creates a new record if one doesn't yet exist
466 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
468 struct nfs_client *clp, *new = NULL;
471 dprintk("--> nfs_get_client(%s,v%u)\n",
472 cl_init->hostname ?: "", cl_init->rpc_ops->version);
474 /* see if the client already exists */
476 spin_lock(&nfs_client_lock);
478 clp = nfs_match_client(cl_init);
484 spin_unlock(&nfs_client_lock);
486 new = nfs_alloc_client(cl_init);
487 } while (!IS_ERR(new));
489 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
492 /* install a new client and return with it unready */
495 list_add(&clp->cl_share_link, &nfs_client_list);
496 spin_unlock(&nfs_client_lock);
497 dprintk("--> nfs_get_client() = %p [new]\n", clp);
500 /* found an existing client
501 * - make sure it's ready before returning
504 spin_unlock(&nfs_client_lock);
507 nfs_free_client(new);
509 error = wait_event_killable(nfs_client_active_wq,
510 clp->cl_cons_state < NFS_CS_INITING);
513 return ERR_PTR(-ERESTARTSYS);
516 if (clp->cl_cons_state < NFS_CS_READY) {
517 error = clp->cl_cons_state;
519 return ERR_PTR(error);
522 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
524 dprintk("--> nfs_get_client() = %p [share]\n", clp);
529 * Mark a server as ready or failed
531 void nfs_mark_client_ready(struct nfs_client *clp, int state)
533 clp->cl_cons_state = state;
534 wake_up_all(&nfs_client_active_wq);
538 * With sessions, the client is not marked ready until after a
539 * successful EXCHANGE_ID and CREATE_SESSION.
541 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
542 * other versions of NFS can be tried.
544 int nfs4_check_client_ready(struct nfs_client *clp)
546 if (!nfs4_has_session(clp))
548 if (clp->cl_cons_state < NFS_CS_READY)
549 return -EPROTONOSUPPORT;
554 * Initialise the timeout values for a connection
556 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
557 unsigned int timeo, unsigned int retrans)
559 to->to_initval = timeo * HZ / 10;
560 to->to_retries = retrans;
563 case XPRT_TRANSPORT_TCP:
564 case XPRT_TRANSPORT_RDMA:
565 if (to->to_retries == 0)
566 to->to_retries = NFS_DEF_TCP_RETRANS;
567 if (to->to_initval == 0)
568 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
569 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
570 to->to_initval = NFS_MAX_TCP_TIMEOUT;
571 to->to_increment = to->to_initval;
572 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
573 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
574 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
575 if (to->to_maxval < to->to_initval)
576 to->to_maxval = to->to_initval;
577 to->to_exponential = 0;
579 case XPRT_TRANSPORT_UDP:
580 if (to->to_retries == 0)
581 to->to_retries = NFS_DEF_UDP_RETRANS;
583 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
584 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
585 to->to_initval = NFS_MAX_UDP_TIMEOUT;
586 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
587 to->to_exponential = 1;
595 * Create an RPC client handle
597 static int nfs_create_rpc_client(struct nfs_client *clp,
598 const struct rpc_timeout *timeparms,
599 rpc_authflavor_t flavor,
600 int discrtry, int noresvport)
602 struct rpc_clnt *clnt = NULL;
603 struct rpc_create_args args = {
604 .protocol = clp->cl_proto,
605 .address = (struct sockaddr *)&clp->cl_addr,
606 .addrsize = clp->cl_addrlen,
607 .timeout = timeparms,
608 .servername = clp->cl_hostname,
609 .program = &nfs_program,
610 .version = clp->rpc_ops->version,
611 .authflavor = flavor,
615 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
617 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
619 if (!IS_ERR(clp->cl_rpcclient))
622 clnt = rpc_create(&args);
624 dprintk("%s: cannot create RPC client. Error = %ld\n",
625 __func__, PTR_ERR(clnt));
626 return PTR_ERR(clnt);
629 clp->cl_rpcclient = clnt;
634 * Version 2 or 3 client destruction
636 static void nfs_destroy_server(struct nfs_server *server)
638 if (!(server->flags & NFS_MOUNT_NONLM))
639 nlmclnt_done(server->nlm_host);
643 * Version 2 or 3 lockd setup
645 static int nfs_start_lockd(struct nfs_server *server)
647 struct nlm_host *host;
648 struct nfs_client *clp = server->nfs_client;
649 struct nlmclnt_initdata nlm_init = {
650 .hostname = clp->cl_hostname,
651 .address = (struct sockaddr *)&clp->cl_addr,
652 .addrlen = clp->cl_addrlen,
653 .nfs_version = clp->rpc_ops->version,
654 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
658 if (nlm_init.nfs_version > 3)
660 if (server->flags & NFS_MOUNT_NONLM)
663 switch (clp->cl_proto) {
665 nlm_init.protocol = IPPROTO_TCP;
667 case XPRT_TRANSPORT_UDP:
668 nlm_init.protocol = IPPROTO_UDP;
671 host = nlmclnt_init(&nlm_init);
673 return PTR_ERR(host);
675 server->nlm_host = host;
676 server->destroy = nfs_destroy_server;
681 * Initialise an NFSv3 ACL client connection
683 #ifdef CONFIG_NFS_V3_ACL
684 static void nfs_init_server_aclclient(struct nfs_server *server)
686 if (server->nfs_client->rpc_ops->version != 3)
688 if (server->flags & NFS_MOUNT_NOACL)
691 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
692 if (IS_ERR(server->client_acl))
695 /* No errors! Assume that Sun nfsacls are supported */
696 server->caps |= NFS_CAP_ACLS;
700 server->caps &= ~NFS_CAP_ACLS;
703 static inline void nfs_init_server_aclclient(struct nfs_server *server)
705 server->flags &= ~NFS_MOUNT_NOACL;
706 server->caps &= ~NFS_CAP_ACLS;
711 * Create a general RPC client
713 static int nfs_init_server_rpcclient(struct nfs_server *server,
714 const struct rpc_timeout *timeo,
715 rpc_authflavor_t pseudoflavour)
717 struct nfs_client *clp = server->nfs_client;
719 server->client = rpc_clone_client(clp->cl_rpcclient);
720 if (IS_ERR(server->client)) {
721 dprintk("%s: couldn't create rpc_client!\n", __func__);
722 return PTR_ERR(server->client);
725 memcpy(&server->client->cl_timeout_default,
727 sizeof(server->client->cl_timeout_default));
728 server->client->cl_timeout = &server->client->cl_timeout_default;
730 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
731 struct rpc_auth *auth;
733 auth = rpcauth_create(pseudoflavour, server->client);
735 dprintk("%s: couldn't create credcache!\n", __func__);
736 return PTR_ERR(auth);
739 server->client->cl_softrtry = 0;
740 if (server->flags & NFS_MOUNT_SOFT)
741 server->client->cl_softrtry = 1;
747 * Initialise an NFS2 or NFS3 client
749 static int nfs_init_client(struct nfs_client *clp,
750 const struct rpc_timeout *timeparms,
751 const struct nfs_parsed_mount_data *data)
755 if (clp->cl_cons_state == NFS_CS_READY) {
756 /* the client is already initialised */
757 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
762 * Create a client RPC handle for doing FSSTAT with UNIX auth only
763 * - RFC 2623, sec 2.3.2
765 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
766 0, data->flags & NFS_MOUNT_NORESVPORT);
769 nfs_mark_client_ready(clp, NFS_CS_READY);
773 nfs_mark_client_ready(clp, error);
774 dprintk("<-- nfs_init_client() = xerror %d\n", error);
779 * Create a version 2 or 3 client
781 static int nfs_init_server(struct nfs_server *server,
782 const struct nfs_parsed_mount_data *data)
784 struct nfs_client_initdata cl_init = {
785 .hostname = data->nfs_server.hostname,
786 .addr = (const struct sockaddr *)&data->nfs_server.address,
787 .addrlen = data->nfs_server.addrlen,
788 .rpc_ops = &nfs_v2_clientops,
789 .proto = data->nfs_server.protocol,
791 struct rpc_timeout timeparms;
792 struct nfs_client *clp;
795 dprintk("--> nfs_init_server()\n");
798 if (data->version == 3)
799 cl_init.rpc_ops = &nfs_v3_clientops;
802 /* Allocate or find a client reference we can use */
803 clp = nfs_get_client(&cl_init);
805 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
809 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
810 data->timeo, data->retrans);
811 error = nfs_init_client(clp, &timeparms, data);
815 server->nfs_client = clp;
817 /* Initialise the client representation from the mount data */
818 server->flags = data->flags;
819 server->options = data->options;
820 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
821 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
822 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
825 server->rsize = nfs_block_size(data->rsize, NULL);
827 server->wsize = nfs_block_size(data->wsize, NULL);
829 server->acregmin = data->acregmin * HZ;
830 server->acregmax = data->acregmax * HZ;
831 server->acdirmin = data->acdirmin * HZ;
832 server->acdirmax = data->acdirmax * HZ;
834 /* Start lockd here, before we might error out */
835 error = nfs_start_lockd(server);
839 server->port = data->nfs_server.port;
841 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
845 /* Preserve the values of mount_server-related mount options */
846 if (data->mount_server.addrlen) {
847 memcpy(&server->mountd_address, &data->mount_server.address,
848 data->mount_server.addrlen);
849 server->mountd_addrlen = data->mount_server.addrlen;
851 server->mountd_version = data->mount_server.version;
852 server->mountd_port = data->mount_server.port;
853 server->mountd_protocol = data->mount_server.protocol;
855 server->namelen = data->namlen;
856 /* Create a client RPC handle for the NFSv3 ACL management interface */
857 nfs_init_server_aclclient(server);
858 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
862 server->nfs_client = NULL;
864 dprintk("<-- nfs_init_server() = xerror %d\n", error);
869 * Load up the server record from information gained in an fsinfo record
871 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
873 unsigned long max_rpc_payload;
875 /* Work out a lot of parameters */
876 if (server->rsize == 0)
877 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
878 if (server->wsize == 0)
879 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
881 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
882 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
883 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
884 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
886 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
887 if (server->rsize > max_rpc_payload)
888 server->rsize = max_rpc_payload;
889 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
890 server->rsize = NFS_MAX_FILE_IO_SIZE;
891 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
893 server->backing_dev_info.name = "nfs";
894 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
896 if (server->wsize > max_rpc_payload)
897 server->wsize = max_rpc_payload;
898 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
899 server->wsize = NFS_MAX_FILE_IO_SIZE;
900 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
901 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
903 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
904 if (server->dtsize > PAGE_CACHE_SIZE)
905 server->dtsize = PAGE_CACHE_SIZE;
906 if (server->dtsize > server->rsize)
907 server->dtsize = server->rsize;
909 if (server->flags & NFS_MOUNT_NOAC) {
910 server->acregmin = server->acregmax = 0;
911 server->acdirmin = server->acdirmax = 0;
914 server->maxfilesize = fsinfo->maxfilesize;
916 /* We're airborne Set socket buffersize */
917 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
921 * Probe filesystem information, including the FSID on v2/v3
923 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
925 struct nfs_fsinfo fsinfo;
926 struct nfs_client *clp = server->nfs_client;
929 dprintk("--> nfs_probe_fsinfo()\n");
931 if (clp->rpc_ops->set_capabilities != NULL) {
932 error = clp->rpc_ops->set_capabilities(server, mntfh);
937 fsinfo.fattr = fattr;
938 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
942 nfs_server_set_fsinfo(server, &fsinfo);
944 /* Get some general file system info */
945 if (server->namelen == 0) {
946 struct nfs_pathconf pathinfo;
948 pathinfo.fattr = fattr;
949 nfs_fattr_init(fattr);
951 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
952 server->namelen = pathinfo.max_namelen;
955 dprintk("<-- nfs_probe_fsinfo() = 0\n");
959 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
964 * Copy useful information when duplicating a server record
966 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
968 target->flags = source->flags;
969 target->rsize = source->rsize;
970 target->wsize = source->wsize;
971 target->acregmin = source->acregmin;
972 target->acregmax = source->acregmax;
973 target->acdirmin = source->acdirmin;
974 target->acdirmax = source->acdirmax;
975 target->caps = source->caps;
976 target->options = source->options;
980 * Allocate and initialise a server record
982 static struct nfs_server *nfs_alloc_server(void)
984 struct nfs_server *server;
986 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
990 server->client = server->client_acl = ERR_PTR(-EINVAL);
992 /* Zero out the NFS state stuff */
993 INIT_LIST_HEAD(&server->client_link);
994 INIT_LIST_HEAD(&server->master_link);
996 atomic_set(&server->active, 0);
998 server->io_stats = nfs_alloc_iostats();
999 if (!server->io_stats) {
1004 if (bdi_init(&server->backing_dev_info)) {
1005 nfs_free_iostats(server->io_stats);
1014 * Free up a server record
1016 void nfs_free_server(struct nfs_server *server)
1018 dprintk("--> nfs_free_server()\n");
1020 spin_lock(&nfs_client_lock);
1021 list_del(&server->client_link);
1022 list_del(&server->master_link);
1023 spin_unlock(&nfs_client_lock);
1025 if (server->destroy != NULL)
1026 server->destroy(server);
1028 if (!IS_ERR(server->client_acl))
1029 rpc_shutdown_client(server->client_acl);
1030 if (!IS_ERR(server->client))
1031 rpc_shutdown_client(server->client);
1033 nfs_put_client(server->nfs_client);
1035 nfs_free_iostats(server->io_stats);
1036 bdi_destroy(&server->backing_dev_info);
1038 nfs_release_automount_timer();
1039 dprintk("<-- nfs_free_server()\n");
1043 * Create a version 2 or 3 volume record
1044 * - keyed on server and FSID
1046 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1047 struct nfs_fh *mntfh)
1049 struct nfs_server *server;
1050 struct nfs_fattr *fattr;
1053 server = nfs_alloc_server();
1055 return ERR_PTR(-ENOMEM);
1058 fattr = nfs_alloc_fattr();
1062 /* Get a client representation */
1063 error = nfs_init_server(server, data);
1067 BUG_ON(!server->nfs_client);
1068 BUG_ON(!server->nfs_client->rpc_ops);
1069 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1071 /* Probe the root fh to retrieve its FSID */
1072 error = nfs_probe_fsinfo(server, mntfh, fattr);
1075 if (server->nfs_client->rpc_ops->version == 3) {
1076 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1077 server->namelen = NFS3_MAXNAMLEN;
1078 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1079 server->caps |= NFS_CAP_READDIRPLUS;
1081 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1082 server->namelen = NFS2_MAXNAMLEN;
1085 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1086 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
1088 dprintk("nfs_create_server: getattr error = %d\n", -error);
1092 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1094 dprintk("Server FSID: %llx:%llx\n",
1095 (unsigned long long) server->fsid.major,
1096 (unsigned long long) server->fsid.minor);
1098 spin_lock(&nfs_client_lock);
1099 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1100 list_add_tail(&server->master_link, &nfs_volume_list);
1101 spin_unlock(&nfs_client_lock);
1103 server->mount_time = jiffies;
1104 nfs_free_fattr(fattr);
1108 nfs_free_fattr(fattr);
1109 nfs_free_server(server);
1110 return ERR_PTR(error);
1113 #ifdef CONFIG_NFS_V4
1115 * Initialize the NFS4 callback service
1117 static int nfs4_init_callback(struct nfs_client *clp)
1121 if (clp->rpc_ops->version == 4) {
1122 if (nfs4_has_session(clp)) {
1123 error = xprt_setup_backchannel(
1124 clp->cl_rpcclient->cl_xprt,
1125 NFS41_BC_MIN_CALLBACKS);
1130 error = nfs_callback_up(clp->cl_mvops->minor_version,
1131 clp->cl_rpcclient->cl_xprt);
1133 dprintk("%s: failed to start callback. Error = %d\n",
1137 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
1143 * Initialize the minor version specific parts of an NFS4 client record
1145 static int nfs4_init_client_minor_version(struct nfs_client *clp)
1147 #if defined(CONFIG_NFS_V4_1)
1148 if (clp->cl_mvops->minor_version) {
1149 struct nfs4_session *session = NULL;
1151 * Create the session and mark it expired.
1152 * When a SEQUENCE operation encounters the expired session
1153 * it will do session recovery to initialize it.
1155 session = nfs4_alloc_session(clp);
1159 clp->cl_session = session;
1161 #endif /* CONFIG_NFS_V4_1 */
1163 return nfs4_init_callback(clp);
1167 * Initialise an NFS4 client record
1169 static int nfs4_init_client(struct nfs_client *clp,
1170 const struct rpc_timeout *timeparms,
1171 const char *ip_addr,
1172 rpc_authflavor_t authflavour,
1177 if (clp->cl_cons_state == NFS_CS_READY) {
1178 /* the client is initialised already */
1179 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1183 /* Check NFS protocol revision and initialize RPC op vector */
1184 clp->rpc_ops = &nfs_v4_clientops;
1186 error = nfs_create_rpc_client(clp, timeparms, authflavour,
1187 1, flags & NFS_MOUNT_NORESVPORT);
1190 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1192 error = nfs_idmap_new(clp);
1194 dprintk("%s: failed to create idmapper. Error = %d\n",
1198 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1200 error = nfs4_init_client_minor_version(clp);
1204 if (!nfs4_has_session(clp))
1205 nfs_mark_client_ready(clp, NFS_CS_READY);
1209 nfs_mark_client_ready(clp, error);
1210 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1215 * Set up an NFS4 client
1217 static int nfs4_set_client(struct nfs_server *server,
1218 const char *hostname,
1219 const struct sockaddr *addr,
1220 const size_t addrlen,
1221 const char *ip_addr,
1222 rpc_authflavor_t authflavour,
1223 int proto, const struct rpc_timeout *timeparms,
1226 struct nfs_client_initdata cl_init = {
1227 .hostname = hostname,
1230 .rpc_ops = &nfs_v4_clientops,
1232 .minorversion = minorversion,
1234 struct nfs_client *clp;
1237 dprintk("--> nfs4_set_client()\n");
1239 /* Allocate or find a client reference we can use */
1240 clp = nfs_get_client(&cl_init);
1242 error = PTR_ERR(clp);
1245 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
1250 server->nfs_client = clp;
1251 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1255 nfs_put_client(clp);
1257 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1263 * Session has been established, and the client marked ready.
1264 * Set the mount rsize and wsize with negotiated fore channel
1265 * attributes which will be bound checked in nfs_server_set_fsinfo.
1267 static void nfs4_session_set_rwsize(struct nfs_server *server)
1269 #ifdef CONFIG_NFS_V4_1
1270 struct nfs4_session *sess;
1274 if (!nfs4_has_session(server->nfs_client))
1276 sess = server->nfs_client->cl_session;
1277 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1278 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1280 if (server->rsize > server_resp_sz)
1281 server->rsize = server_resp_sz;
1282 if (server->wsize > server_rqst_sz)
1283 server->wsize = server_rqst_sz;
1284 #endif /* CONFIG_NFS_V4_1 */
1287 static int nfs4_server_common_setup(struct nfs_server *server,
1288 struct nfs_fh *mntfh)
1290 struct nfs_fattr *fattr;
1293 BUG_ON(!server->nfs_client);
1294 BUG_ON(!server->nfs_client->rpc_ops);
1295 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1297 fattr = nfs_alloc_fattr();
1301 /* We must ensure the session is initialised first */
1302 error = nfs4_init_session(server);
1306 /* Probe the root fh to retrieve its FSID and filehandle */
1307 error = nfs4_get_rootfh(server, mntfh);
1311 dprintk("Server FSID: %llx:%llx\n",
1312 (unsigned long long) server->fsid.major,
1313 (unsigned long long) server->fsid.minor);
1314 dprintk("Mount FH: %d\n", mntfh->size);
1316 nfs4_session_set_rwsize(server);
1318 error = nfs_probe_fsinfo(server, mntfh, fattr);
1322 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1323 server->namelen = NFS4_MAXNAMLEN;
1325 spin_lock(&nfs_client_lock);
1326 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1327 list_add_tail(&server->master_link, &nfs_volume_list);
1328 spin_unlock(&nfs_client_lock);
1330 server->mount_time = jiffies;
1332 nfs_free_fattr(fattr);
1337 * Create a version 4 volume record
1339 static int nfs4_init_server(struct nfs_server *server,
1340 const struct nfs_parsed_mount_data *data)
1342 struct rpc_timeout timeparms;
1345 dprintk("--> nfs4_init_server()\n");
1347 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1348 data->timeo, data->retrans);
1350 /* Initialise the client representation from the mount data */
1351 server->flags = data->flags;
1352 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|
1354 server->options = data->options;
1356 /* Get a client record */
1357 error = nfs4_set_client(server,
1358 data->nfs_server.hostname,
1359 (const struct sockaddr *)&data->nfs_server.address,
1360 data->nfs_server.addrlen,
1361 data->client_address,
1362 data->auth_flavors[0],
1363 data->nfs_server.protocol,
1365 data->minorversion);
1370 server->rsize = nfs_block_size(data->rsize, NULL);
1372 server->wsize = nfs_block_size(data->wsize, NULL);
1374 server->acregmin = data->acregmin * HZ;
1375 server->acregmax = data->acregmax * HZ;
1376 server->acdirmin = data->acdirmin * HZ;
1377 server->acdirmax = data->acdirmax * HZ;
1379 server->port = data->nfs_server.port;
1381 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1385 dprintk("<-- nfs4_init_server() = %d\n", error);
1390 * Create a version 4 volume record
1391 * - keyed on server and FSID
1393 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1394 struct nfs_fh *mntfh)
1396 struct nfs_server *server;
1399 dprintk("--> nfs4_create_server()\n");
1401 server = nfs_alloc_server();
1403 return ERR_PTR(-ENOMEM);
1405 /* set up the general RPC client */
1406 error = nfs4_init_server(server, data);
1410 error = nfs4_server_common_setup(server, mntfh);
1414 dprintk("<-- nfs4_create_server() = %p\n", server);
1418 nfs_free_server(server);
1419 dprintk("<-- nfs4_create_server() = error %d\n", error);
1420 return ERR_PTR(error);
1424 * Create an NFS4 referral server record
1426 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1427 struct nfs_fh *mntfh)
1429 struct nfs_client *parent_client;
1430 struct nfs_server *server, *parent_server;
1433 dprintk("--> nfs4_create_referral_server()\n");
1435 server = nfs_alloc_server();
1437 return ERR_PTR(-ENOMEM);
1439 parent_server = NFS_SB(data->sb);
1440 parent_client = parent_server->nfs_client;
1442 /* Initialise the client representation from the parent server */
1443 nfs_server_copy_userdata(server, parent_server);
1444 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1446 /* Get a client representation.
1447 * Note: NFSv4 always uses TCP, */
1448 error = nfs4_set_client(server, data->hostname,
1451 parent_client->cl_ipaddr,
1453 parent_server->client->cl_xprt->prot,
1454 parent_server->client->cl_timeout,
1455 parent_client->cl_mvops->minor_version);
1459 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1463 error = nfs4_server_common_setup(server, mntfh);
1467 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1471 nfs_free_server(server);
1472 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1473 return ERR_PTR(error);
1476 #endif /* CONFIG_NFS_V4 */
1479 * Clone an NFS2, NFS3 or NFS4 server record
1481 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1483 struct nfs_fattr *fattr)
1485 struct nfs_server *server;
1486 struct nfs_fattr *fattr_fsinfo;
1489 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1490 (unsigned long long) fattr->fsid.major,
1491 (unsigned long long) fattr->fsid.minor);
1493 server = nfs_alloc_server();
1495 return ERR_PTR(-ENOMEM);
1498 fattr_fsinfo = nfs_alloc_fattr();
1499 if (fattr_fsinfo == NULL)
1500 goto out_free_server;
1502 /* Copy data from the source */
1503 server->nfs_client = source->nfs_client;
1504 atomic_inc(&server->nfs_client->cl_count);
1505 nfs_server_copy_userdata(server, source);
1507 server->fsid = fattr->fsid;
1509 error = nfs_init_server_rpcclient(server,
1510 source->client->cl_timeout,
1511 source->client->cl_auth->au_flavor);
1513 goto out_free_server;
1514 if (!IS_ERR(source->client_acl))
1515 nfs_init_server_aclclient(server);
1517 /* probe the filesystem info for this server filesystem */
1518 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1520 goto out_free_server;
1522 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1523 server->namelen = NFS4_MAXNAMLEN;
1525 dprintk("Cloned FSID: %llx:%llx\n",
1526 (unsigned long long) server->fsid.major,
1527 (unsigned long long) server->fsid.minor);
1529 error = nfs_start_lockd(server);
1531 goto out_free_server;
1533 spin_lock(&nfs_client_lock);
1534 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1535 list_add_tail(&server->master_link, &nfs_volume_list);
1536 spin_unlock(&nfs_client_lock);
1538 server->mount_time = jiffies;
1540 nfs_free_fattr(fattr_fsinfo);
1541 dprintk("<-- nfs_clone_server() = %p\n", server);
1545 nfs_free_fattr(fattr_fsinfo);
1546 nfs_free_server(server);
1547 dprintk("<-- nfs_clone_server() = error %d\n", error);
1548 return ERR_PTR(error);
1551 #ifdef CONFIG_PROC_FS
1552 static struct proc_dir_entry *proc_fs_nfs;
1554 static int nfs_server_list_open(struct inode *inode, struct file *file);
1555 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1556 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1557 static void nfs_server_list_stop(struct seq_file *p, void *v);
1558 static int nfs_server_list_show(struct seq_file *m, void *v);
1560 static const struct seq_operations nfs_server_list_ops = {
1561 .start = nfs_server_list_start,
1562 .next = nfs_server_list_next,
1563 .stop = nfs_server_list_stop,
1564 .show = nfs_server_list_show,
1567 static const struct file_operations nfs_server_list_fops = {
1568 .open = nfs_server_list_open,
1570 .llseek = seq_lseek,
1571 .release = seq_release,
1572 .owner = THIS_MODULE,
1575 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1576 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1577 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1578 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1579 static int nfs_volume_list_show(struct seq_file *m, void *v);
1581 static const struct seq_operations nfs_volume_list_ops = {
1582 .start = nfs_volume_list_start,
1583 .next = nfs_volume_list_next,
1584 .stop = nfs_volume_list_stop,
1585 .show = nfs_volume_list_show,
1588 static const struct file_operations nfs_volume_list_fops = {
1589 .open = nfs_volume_list_open,
1591 .llseek = seq_lseek,
1592 .release = seq_release,
1593 .owner = THIS_MODULE,
1597 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1600 static int nfs_server_list_open(struct inode *inode, struct file *file)
1605 ret = seq_open(file, &nfs_server_list_ops);
1609 m = file->private_data;
1610 m->private = PDE(inode)->data;
1616 * set up the iterator to start reading from the server list and return the first item
1618 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1620 /* lock the list against modification */
1621 spin_lock(&nfs_client_lock);
1622 return seq_list_start_head(&nfs_client_list, *_pos);
1626 * move to next server
1628 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1630 return seq_list_next(v, &nfs_client_list, pos);
1634 * clean up after reading from the transports list
1636 static void nfs_server_list_stop(struct seq_file *p, void *v)
1638 spin_unlock(&nfs_client_lock);
1642 * display a header line followed by a load of call lines
1644 static int nfs_server_list_show(struct seq_file *m, void *v)
1646 struct nfs_client *clp;
1648 /* display header on line 1 */
1649 if (v == &nfs_client_list) {
1650 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1654 /* display one transport per line on subsequent lines */
1655 clp = list_entry(v, struct nfs_client, cl_share_link);
1657 seq_printf(m, "v%u %s %s %3d %s\n",
1658 clp->rpc_ops->version,
1659 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1660 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1661 atomic_read(&clp->cl_count),
1668 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1670 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1675 ret = seq_open(file, &nfs_volume_list_ops);
1679 m = file->private_data;
1680 m->private = PDE(inode)->data;
1686 * set up the iterator to start reading from the volume list and return the first item
1688 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1690 /* lock the list against modification */
1691 spin_lock(&nfs_client_lock);
1692 return seq_list_start_head(&nfs_volume_list, *_pos);
1696 * move to next volume
1698 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1700 return seq_list_next(v, &nfs_volume_list, pos);
1704 * clean up after reading from the transports list
1706 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1708 spin_unlock(&nfs_client_lock);
1712 * display a header line followed by a load of call lines
1714 static int nfs_volume_list_show(struct seq_file *m, void *v)
1716 struct nfs_server *server;
1717 struct nfs_client *clp;
1718 char dev[8], fsid[17];
1720 /* display header on line 1 */
1721 if (v == &nfs_volume_list) {
1722 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
1725 /* display one transport per line on subsequent lines */
1726 server = list_entry(v, struct nfs_server, master_link);
1727 clp = server->nfs_client;
1729 snprintf(dev, 8, "%u:%u",
1730 MAJOR(server->s_dev), MINOR(server->s_dev));
1732 snprintf(fsid, 17, "%llx:%llx",
1733 (unsigned long long) server->fsid.major,
1734 (unsigned long long) server->fsid.minor);
1736 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1737 clp->rpc_ops->version,
1738 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1739 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1742 nfs_server_fscache_state(server));
1748 * initialise the /proc/fs/nfsfs/ directory
1750 int __init nfs_fs_proc_init(void)
1752 struct proc_dir_entry *p;
1754 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1758 /* a file of servers with which we're dealing */
1759 p = proc_create("servers", S_IFREG|S_IRUGO,
1760 proc_fs_nfs, &nfs_server_list_fops);
1764 /* a file of volumes that we have mounted */
1765 p = proc_create("volumes", S_IFREG|S_IRUGO,
1766 proc_fs_nfs, &nfs_volume_list_fops);
1772 remove_proc_entry("servers", proc_fs_nfs);
1774 remove_proc_entry("fs/nfsfs", NULL);
1780 * clean up the /proc/fs/nfsfs/ directory
1782 void nfs_fs_proc_exit(void)
1784 remove_proc_entry("volumes", proc_fs_nfs);
1785 remove_proc_entry("servers", proc_fs_nfs);
1786 remove_proc_entry("fs/nfsfs", NULL);
1789 #endif /* CONFIG_PROC_FS */