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;
154 cred = rpc_lookup_machine_cred();
156 clp->cl_machine_cred = cred;
158 nfs_fscache_get_client_cookie(clp);
170 * Clears/puts all minor version specific parts from an nfs_client struct
171 * reverting it to minorversion 0.
173 static void nfs4_clear_client_minor_version(struct nfs_client *clp)
175 #ifdef CONFIG_NFS_V4_1
176 if (nfs4_has_session(clp)) {
177 nfs4_destroy_session(clp->cl_session);
178 clp->cl_session = NULL;
181 clp->cl_call_sync = _nfs4_call_sync;
182 #endif /* CONFIG_NFS_V4_1 */
186 * Destroy the NFS4 callback service
188 static void nfs4_destroy_callback(struct nfs_client *clp)
190 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
191 nfs_callback_down(clp->cl_minorversion);
194 static void nfs4_shutdown_client(struct nfs_client *clp)
196 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
197 nfs4_kill_renewd(clp);
198 nfs4_clear_client_minor_version(clp);
199 nfs4_destroy_callback(clp);
200 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
201 nfs_idmap_delete(clp);
203 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
206 static void nfs4_shutdown_client(struct nfs_client *clp)
209 #endif /* CONFIG_NFS_V4 */
212 * Destroy a shared client record
214 static void nfs_free_client(struct nfs_client *clp)
216 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
218 nfs4_shutdown_client(clp);
220 nfs_fscache_release_client_cookie(clp);
222 /* -EIO all pending I/O */
223 if (!IS_ERR(clp->cl_rpcclient))
224 rpc_shutdown_client(clp->cl_rpcclient);
226 if (clp->cl_machine_cred != NULL)
227 put_rpccred(clp->cl_machine_cred);
229 kfree(clp->cl_hostname);
232 dprintk("<-- nfs_free_client()\n");
236 * Release a reference to a shared client record
238 void nfs_put_client(struct nfs_client *clp)
243 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
245 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
246 list_del(&clp->cl_share_link);
247 spin_unlock(&nfs_client_lock);
249 BUG_ON(!list_empty(&clp->cl_superblocks));
251 nfs_free_client(clp);
255 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
257 * Test if two ip6 socket addresses refer to the same socket by
258 * comparing relevant fields. The padding bytes specifically, are not
259 * compared. sin6_flowinfo is not compared because it only affects QoS
260 * and sin6_scope_id is only compared if the address is "link local"
261 * because "link local" addresses need only be unique to a specific
262 * link. Conversely, ordinary unicast addresses might have different
265 * The caller should ensure both socket addresses are AF_INET6.
267 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
268 const struct sockaddr *sa2)
270 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
271 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
273 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
274 sin1->sin6_scope_id != sin2->sin6_scope_id)
277 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
279 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
280 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
281 const struct sockaddr *sa2)
288 * Test if two ip4 socket addresses refer to the same socket, by
289 * comparing relevant fields. The padding bytes specifically, are
292 * The caller should ensure both socket addresses are AF_INET.
294 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
295 const struct sockaddr *sa2)
297 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
298 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
300 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
303 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
304 const struct sockaddr *sa2)
306 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
307 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
309 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
310 (sin1->sin6_port == sin2->sin6_port);
313 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
314 const struct sockaddr *sa2)
316 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
317 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
319 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
320 (sin1->sin_port == sin2->sin_port);
324 * Test if two socket addresses represent the same actual socket,
325 * by comparing (only) relevant fields, excluding the port number.
327 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
328 const struct sockaddr *sa2)
330 if (sa1->sa_family != sa2->sa_family)
333 switch (sa1->sa_family) {
335 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
337 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
343 * Test if two socket addresses represent the same actual socket,
344 * by comparing (only) relevant fields, including the port number.
346 static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
347 const struct sockaddr *sa2)
349 if (sa1->sa_family != sa2->sa_family)
352 switch (sa1->sa_family) {
354 return nfs_sockaddr_cmp_ip4(sa1, sa2);
356 return nfs_sockaddr_cmp_ip6(sa1, sa2);
362 * Find a client by IP address and protocol version
363 * - returns NULL if no such client
365 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
367 struct nfs_client *clp;
369 spin_lock(&nfs_client_lock);
370 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
371 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
373 /* Don't match clients that failed to initialise properly */
374 if (!(clp->cl_cons_state == NFS_CS_READY ||
375 clp->cl_cons_state == NFS_CS_SESSION_INITING))
378 /* Different NFS versions cannot share the same nfs_client */
379 if (clp->rpc_ops->version != nfsversion)
382 /* Match only the IP address, not the port number */
383 if (!nfs_sockaddr_match_ipaddr(addr, clap))
386 atomic_inc(&clp->cl_count);
387 spin_unlock(&nfs_client_lock);
390 spin_unlock(&nfs_client_lock);
395 * Find a client by IP address and protocol version
396 * - returns NULL if no such client
398 struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
400 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
401 u32 nfsvers = clp->rpc_ops->version;
403 spin_lock(&nfs_client_lock);
404 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
405 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
407 /* Don't match clients that failed to initialise properly */
408 if (clp->cl_cons_state != NFS_CS_READY)
411 /* Different NFS versions cannot share the same nfs_client */
412 if (clp->rpc_ops->version != nfsvers)
415 /* Match only the IP address, not the port number */
416 if (!nfs_sockaddr_match_ipaddr(sap, clap))
419 atomic_inc(&clp->cl_count);
420 spin_unlock(&nfs_client_lock);
423 spin_unlock(&nfs_client_lock);
428 * Find an nfs_client on the list that matches the initialisation data
431 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
433 struct nfs_client *clp;
434 const struct sockaddr *sap = data->addr;
436 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
437 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
438 /* Don't match clients that failed to initialise properly */
439 if (clp->cl_cons_state < 0)
442 /* Different NFS versions cannot share the same nfs_client */
443 if (clp->rpc_ops != data->rpc_ops)
446 if (clp->cl_proto != data->proto)
448 /* Match nfsv4 minorversion */
449 if (clp->cl_minorversion != data->minorversion)
451 /* Match the full socket address */
452 if (!nfs_sockaddr_cmp(sap, clap))
455 atomic_inc(&clp->cl_count);
462 * Look up a client by IP address and protocol version
463 * - creates a new record if one doesn't yet exist
465 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
467 struct nfs_client *clp, *new = NULL;
470 dprintk("--> nfs_get_client(%s,v%u)\n",
471 cl_init->hostname ?: "", cl_init->rpc_ops->version);
473 /* see if the client already exists */
475 spin_lock(&nfs_client_lock);
477 clp = nfs_match_client(cl_init);
483 spin_unlock(&nfs_client_lock);
485 new = nfs_alloc_client(cl_init);
486 } while (!IS_ERR(new));
488 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
491 /* install a new client and return with it unready */
494 list_add(&clp->cl_share_link, &nfs_client_list);
495 spin_unlock(&nfs_client_lock);
496 dprintk("--> nfs_get_client() = %p [new]\n", clp);
499 /* found an existing client
500 * - make sure it's ready before returning
503 spin_unlock(&nfs_client_lock);
506 nfs_free_client(new);
508 error = wait_event_killable(nfs_client_active_wq,
509 clp->cl_cons_state < NFS_CS_INITING);
512 return ERR_PTR(-ERESTARTSYS);
515 if (clp->cl_cons_state < NFS_CS_READY) {
516 error = clp->cl_cons_state;
518 return ERR_PTR(error);
521 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
523 dprintk("--> nfs_get_client() = %p [share]\n", clp);
528 * Mark a server as ready or failed
530 void nfs_mark_client_ready(struct nfs_client *clp, int state)
532 clp->cl_cons_state = state;
533 wake_up_all(&nfs_client_active_wq);
537 * With sessions, the client is not marked ready until after a
538 * successful EXCHANGE_ID and CREATE_SESSION.
540 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
541 * other versions of NFS can be tried.
543 int nfs4_check_client_ready(struct nfs_client *clp)
545 if (!nfs4_has_session(clp))
547 if (clp->cl_cons_state < NFS_CS_READY)
548 return -EPROTONOSUPPORT;
553 * Initialise the timeout values for a connection
555 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
556 unsigned int timeo, unsigned int retrans)
558 to->to_initval = timeo * HZ / 10;
559 to->to_retries = retrans;
562 case XPRT_TRANSPORT_TCP:
563 case XPRT_TRANSPORT_RDMA:
564 if (to->to_retries == 0)
565 to->to_retries = NFS_DEF_TCP_RETRANS;
566 if (to->to_initval == 0)
567 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
568 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
569 to->to_initval = NFS_MAX_TCP_TIMEOUT;
570 to->to_increment = to->to_initval;
571 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
572 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
573 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
574 if (to->to_maxval < to->to_initval)
575 to->to_maxval = to->to_initval;
576 to->to_exponential = 0;
578 case XPRT_TRANSPORT_UDP:
579 if (to->to_retries == 0)
580 to->to_retries = NFS_DEF_UDP_RETRANS;
582 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
583 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
584 to->to_initval = NFS_MAX_UDP_TIMEOUT;
585 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
586 to->to_exponential = 1;
594 * Create an RPC client handle
596 static int nfs_create_rpc_client(struct nfs_client *clp,
597 const struct rpc_timeout *timeparms,
598 rpc_authflavor_t flavor,
599 int discrtry, int noresvport)
601 struct rpc_clnt *clnt = NULL;
602 struct rpc_create_args args = {
603 .protocol = clp->cl_proto,
604 .address = (struct sockaddr *)&clp->cl_addr,
605 .addrsize = clp->cl_addrlen,
606 .timeout = timeparms,
607 .servername = clp->cl_hostname,
608 .program = &nfs_program,
609 .version = clp->rpc_ops->version,
610 .authflavor = flavor,
614 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
616 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
618 if (!IS_ERR(clp->cl_rpcclient))
621 clnt = rpc_create(&args);
623 dprintk("%s: cannot create RPC client. Error = %ld\n",
624 __func__, PTR_ERR(clnt));
625 return PTR_ERR(clnt);
628 clp->cl_rpcclient = clnt;
633 * Version 2 or 3 client destruction
635 static void nfs_destroy_server(struct nfs_server *server)
637 if (!(server->flags & NFS_MOUNT_NONLM))
638 nlmclnt_done(server->nlm_host);
642 * Version 2 or 3 lockd setup
644 static int nfs_start_lockd(struct nfs_server *server)
646 struct nlm_host *host;
647 struct nfs_client *clp = server->nfs_client;
648 struct nlmclnt_initdata nlm_init = {
649 .hostname = clp->cl_hostname,
650 .address = (struct sockaddr *)&clp->cl_addr,
651 .addrlen = clp->cl_addrlen,
652 .nfs_version = clp->rpc_ops->version,
653 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
657 if (nlm_init.nfs_version > 3)
659 if (server->flags & NFS_MOUNT_NONLM)
662 switch (clp->cl_proto) {
664 nlm_init.protocol = IPPROTO_TCP;
666 case XPRT_TRANSPORT_UDP:
667 nlm_init.protocol = IPPROTO_UDP;
670 host = nlmclnt_init(&nlm_init);
672 return PTR_ERR(host);
674 server->nlm_host = host;
675 server->destroy = nfs_destroy_server;
680 * Initialise an NFSv3 ACL client connection
682 #ifdef CONFIG_NFS_V3_ACL
683 static void nfs_init_server_aclclient(struct nfs_server *server)
685 if (server->nfs_client->rpc_ops->version != 3)
687 if (server->flags & NFS_MOUNT_NOACL)
690 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
691 if (IS_ERR(server->client_acl))
694 /* No errors! Assume that Sun nfsacls are supported */
695 server->caps |= NFS_CAP_ACLS;
699 server->caps &= ~NFS_CAP_ACLS;
702 static inline void nfs_init_server_aclclient(struct nfs_server *server)
704 server->flags &= ~NFS_MOUNT_NOACL;
705 server->caps &= ~NFS_CAP_ACLS;
710 * Create a general RPC client
712 static int nfs_init_server_rpcclient(struct nfs_server *server,
713 const struct rpc_timeout *timeo,
714 rpc_authflavor_t pseudoflavour)
716 struct nfs_client *clp = server->nfs_client;
718 server->client = rpc_clone_client(clp->cl_rpcclient);
719 if (IS_ERR(server->client)) {
720 dprintk("%s: couldn't create rpc_client!\n", __func__);
721 return PTR_ERR(server->client);
724 memcpy(&server->client->cl_timeout_default,
726 sizeof(server->client->cl_timeout_default));
727 server->client->cl_timeout = &server->client->cl_timeout_default;
729 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
730 struct rpc_auth *auth;
732 auth = rpcauth_create(pseudoflavour, server->client);
734 dprintk("%s: couldn't create credcache!\n", __func__);
735 return PTR_ERR(auth);
738 server->client->cl_softrtry = 0;
739 if (server->flags & NFS_MOUNT_SOFT)
740 server->client->cl_softrtry = 1;
746 * Initialise an NFS2 or NFS3 client
748 static int nfs_init_client(struct nfs_client *clp,
749 const struct rpc_timeout *timeparms,
750 const struct nfs_parsed_mount_data *data)
754 if (clp->cl_cons_state == NFS_CS_READY) {
755 /* the client is already initialised */
756 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
761 * Create a client RPC handle for doing FSSTAT with UNIX auth only
762 * - RFC 2623, sec 2.3.2
764 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
765 0, data->flags & NFS_MOUNT_NORESVPORT);
768 nfs_mark_client_ready(clp, NFS_CS_READY);
772 nfs_mark_client_ready(clp, error);
773 dprintk("<-- nfs_init_client() = xerror %d\n", error);
778 * Create a version 2 or 3 client
780 static int nfs_init_server(struct nfs_server *server,
781 const struct nfs_parsed_mount_data *data)
783 struct nfs_client_initdata cl_init = {
784 .hostname = data->nfs_server.hostname,
785 .addr = (const struct sockaddr *)&data->nfs_server.address,
786 .addrlen = data->nfs_server.addrlen,
787 .rpc_ops = &nfs_v2_clientops,
788 .proto = data->nfs_server.protocol,
790 struct rpc_timeout timeparms;
791 struct nfs_client *clp;
794 dprintk("--> nfs_init_server()\n");
797 if (data->version == 3)
798 cl_init.rpc_ops = &nfs_v3_clientops;
801 /* Allocate or find a client reference we can use */
802 clp = nfs_get_client(&cl_init);
804 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
808 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
809 data->timeo, data->retrans);
810 error = nfs_init_client(clp, &timeparms, data);
814 server->nfs_client = clp;
816 /* Initialise the client representation from the mount data */
817 server->flags = data->flags;
818 server->options = data->options;
819 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
820 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
821 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
824 server->rsize = nfs_block_size(data->rsize, NULL);
826 server->wsize = nfs_block_size(data->wsize, NULL);
828 server->acregmin = data->acregmin * HZ;
829 server->acregmax = data->acregmax * HZ;
830 server->acdirmin = data->acdirmin * HZ;
831 server->acdirmax = data->acdirmax * HZ;
833 /* Start lockd here, before we might error out */
834 error = nfs_start_lockd(server);
838 server->port = data->nfs_server.port;
840 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
844 /* Preserve the values of mount_server-related mount options */
845 if (data->mount_server.addrlen) {
846 memcpy(&server->mountd_address, &data->mount_server.address,
847 data->mount_server.addrlen);
848 server->mountd_addrlen = data->mount_server.addrlen;
850 server->mountd_version = data->mount_server.version;
851 server->mountd_port = data->mount_server.port;
852 server->mountd_protocol = data->mount_server.protocol;
854 server->namelen = data->namlen;
855 /* Create a client RPC handle for the NFSv3 ACL management interface */
856 nfs_init_server_aclclient(server);
857 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
861 server->nfs_client = NULL;
863 dprintk("<-- nfs_init_server() = xerror %d\n", error);
868 * Load up the server record from information gained in an fsinfo record
870 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
872 unsigned long max_rpc_payload;
874 /* Work out a lot of parameters */
875 if (server->rsize == 0)
876 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
877 if (server->wsize == 0)
878 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
880 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
881 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
882 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
883 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
885 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
886 if (server->rsize > max_rpc_payload)
887 server->rsize = max_rpc_payload;
888 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
889 server->rsize = NFS_MAX_FILE_IO_SIZE;
890 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
892 server->backing_dev_info.name = "nfs";
893 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
895 if (server->wsize > max_rpc_payload)
896 server->wsize = max_rpc_payload;
897 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
898 server->wsize = NFS_MAX_FILE_IO_SIZE;
899 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
900 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
902 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
903 if (server->dtsize > PAGE_CACHE_SIZE)
904 server->dtsize = PAGE_CACHE_SIZE;
905 if (server->dtsize > server->rsize)
906 server->dtsize = server->rsize;
908 if (server->flags & NFS_MOUNT_NOAC) {
909 server->acregmin = server->acregmax = 0;
910 server->acdirmin = server->acdirmax = 0;
913 server->maxfilesize = fsinfo->maxfilesize;
915 /* We're airborne Set socket buffersize */
916 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
920 * Probe filesystem information, including the FSID on v2/v3
922 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
924 struct nfs_fsinfo fsinfo;
925 struct nfs_client *clp = server->nfs_client;
928 dprintk("--> nfs_probe_fsinfo()\n");
930 if (clp->rpc_ops->set_capabilities != NULL) {
931 error = clp->rpc_ops->set_capabilities(server, mntfh);
936 fsinfo.fattr = fattr;
937 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
941 nfs_server_set_fsinfo(server, &fsinfo);
943 /* Get some general file system info */
944 if (server->namelen == 0) {
945 struct nfs_pathconf pathinfo;
947 pathinfo.fattr = fattr;
948 nfs_fattr_init(fattr);
950 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
951 server->namelen = pathinfo.max_namelen;
954 dprintk("<-- nfs_probe_fsinfo() = 0\n");
958 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
963 * Copy useful information when duplicating a server record
965 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
967 target->flags = source->flags;
968 target->rsize = source->rsize;
969 target->wsize = source->wsize;
970 target->acregmin = source->acregmin;
971 target->acregmax = source->acregmax;
972 target->acdirmin = source->acdirmin;
973 target->acdirmax = source->acdirmax;
974 target->caps = source->caps;
975 target->options = source->options;
979 * Allocate and initialise a server record
981 static struct nfs_server *nfs_alloc_server(void)
983 struct nfs_server *server;
985 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
989 server->client = server->client_acl = ERR_PTR(-EINVAL);
991 /* Zero out the NFS state stuff */
992 INIT_LIST_HEAD(&server->client_link);
993 INIT_LIST_HEAD(&server->master_link);
995 atomic_set(&server->active, 0);
997 server->io_stats = nfs_alloc_iostats();
998 if (!server->io_stats) {
1003 if (bdi_init(&server->backing_dev_info)) {
1004 nfs_free_iostats(server->io_stats);
1013 * Free up a server record
1015 void nfs_free_server(struct nfs_server *server)
1017 dprintk("--> nfs_free_server()\n");
1019 spin_lock(&nfs_client_lock);
1020 list_del(&server->client_link);
1021 list_del(&server->master_link);
1022 spin_unlock(&nfs_client_lock);
1024 if (server->destroy != NULL)
1025 server->destroy(server);
1027 if (!IS_ERR(server->client_acl))
1028 rpc_shutdown_client(server->client_acl);
1029 if (!IS_ERR(server->client))
1030 rpc_shutdown_client(server->client);
1032 nfs_put_client(server->nfs_client);
1034 nfs_free_iostats(server->io_stats);
1035 bdi_destroy(&server->backing_dev_info);
1037 nfs_release_automount_timer();
1038 dprintk("<-- nfs_free_server()\n");
1042 * Create a version 2 or 3 volume record
1043 * - keyed on server and FSID
1045 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1046 struct nfs_fh *mntfh)
1048 struct nfs_server *server;
1049 struct nfs_fattr *fattr;
1052 server = nfs_alloc_server();
1054 return ERR_PTR(-ENOMEM);
1057 fattr = nfs_alloc_fattr();
1061 /* Get a client representation */
1062 error = nfs_init_server(server, data);
1066 BUG_ON(!server->nfs_client);
1067 BUG_ON(!server->nfs_client->rpc_ops);
1068 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1070 /* Probe the root fh to retrieve its FSID */
1071 error = nfs_probe_fsinfo(server, mntfh, fattr);
1074 if (server->nfs_client->rpc_ops->version == 3) {
1075 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1076 server->namelen = NFS3_MAXNAMLEN;
1077 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1078 server->caps |= NFS_CAP_READDIRPLUS;
1080 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1081 server->namelen = NFS2_MAXNAMLEN;
1084 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1085 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
1087 dprintk("nfs_create_server: getattr error = %d\n", -error);
1091 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1093 dprintk("Server FSID: %llx:%llx\n",
1094 (unsigned long long) server->fsid.major,
1095 (unsigned long long) server->fsid.minor);
1097 spin_lock(&nfs_client_lock);
1098 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1099 list_add_tail(&server->master_link, &nfs_volume_list);
1100 spin_unlock(&nfs_client_lock);
1102 server->mount_time = jiffies;
1103 nfs_free_fattr(fattr);
1107 nfs_free_fattr(fattr);
1108 nfs_free_server(server);
1109 return ERR_PTR(error);
1112 #ifdef CONFIG_NFS_V4
1114 * Initialize the NFS4 callback service
1116 static int nfs4_init_callback(struct nfs_client *clp)
1120 if (clp->rpc_ops->version == 4) {
1121 if (nfs4_has_session(clp)) {
1122 error = xprt_setup_backchannel(
1123 clp->cl_rpcclient->cl_xprt,
1124 NFS41_BC_MIN_CALLBACKS);
1129 error = nfs_callback_up(clp->cl_minorversion,
1130 clp->cl_rpcclient->cl_xprt);
1132 dprintk("%s: failed to start callback. Error = %d\n",
1136 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
1142 * Initialize the minor version specific parts of an NFS4 client record
1144 static int nfs4_init_client_minor_version(struct nfs_client *clp)
1146 clp->cl_call_sync = _nfs4_call_sync;
1148 #if defined(CONFIG_NFS_V4_1)
1149 if (clp->cl_minorversion) {
1150 struct nfs4_session *session = NULL;
1152 * Create the session and mark it expired.
1153 * When a SEQUENCE operation encounters the expired session
1154 * it will do session recovery to initialize it.
1156 session = nfs4_alloc_session(clp);
1160 clp->cl_session = session;
1161 clp->cl_call_sync = _nfs4_call_sync_session;
1163 #endif /* CONFIG_NFS_V4_1 */
1165 return nfs4_init_callback(clp);
1169 * Initialise an NFS4 client record
1171 static int nfs4_init_client(struct nfs_client *clp,
1172 const struct rpc_timeout *timeparms,
1173 const char *ip_addr,
1174 rpc_authflavor_t authflavour,
1179 if (clp->cl_cons_state == NFS_CS_READY) {
1180 /* the client is initialised already */
1181 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1185 /* Check NFS protocol revision and initialize RPC op vector */
1186 clp->rpc_ops = &nfs_v4_clientops;
1188 error = nfs_create_rpc_client(clp, timeparms, authflavour,
1189 1, flags & NFS_MOUNT_NORESVPORT);
1192 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1194 error = nfs_idmap_new(clp);
1196 dprintk("%s: failed to create idmapper. Error = %d\n",
1200 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1202 error = nfs4_init_client_minor_version(clp);
1206 if (!nfs4_has_session(clp))
1207 nfs_mark_client_ready(clp, NFS_CS_READY);
1211 nfs_mark_client_ready(clp, error);
1212 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1217 * Set up an NFS4 client
1219 static int nfs4_set_client(struct nfs_server *server,
1220 const char *hostname,
1221 const struct sockaddr *addr,
1222 const size_t addrlen,
1223 const char *ip_addr,
1224 rpc_authflavor_t authflavour,
1225 int proto, const struct rpc_timeout *timeparms,
1228 struct nfs_client_initdata cl_init = {
1229 .hostname = hostname,
1232 .rpc_ops = &nfs_v4_clientops,
1234 .minorversion = minorversion,
1236 struct nfs_client *clp;
1239 dprintk("--> nfs4_set_client()\n");
1241 /* Allocate or find a client reference we can use */
1242 clp = nfs_get_client(&cl_init);
1244 error = PTR_ERR(clp);
1247 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
1252 server->nfs_client = clp;
1253 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1257 nfs_put_client(clp);
1259 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1265 * Session has been established, and the client marked ready.
1266 * Set the mount rsize and wsize with negotiated fore channel
1267 * attributes which will be bound checked in nfs_server_set_fsinfo.
1269 static void nfs4_session_set_rwsize(struct nfs_server *server)
1271 #ifdef CONFIG_NFS_V4_1
1272 struct nfs4_session *sess;
1276 if (!nfs4_has_session(server->nfs_client))
1278 sess = server->nfs_client->cl_session;
1279 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1280 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1282 if (server->rsize > server_resp_sz)
1283 server->rsize = server_resp_sz;
1284 if (server->wsize > server_rqst_sz)
1285 server->wsize = server_rqst_sz;
1286 #endif /* CONFIG_NFS_V4_1 */
1289 static int nfs4_server_common_setup(struct nfs_server *server,
1290 struct nfs_fh *mntfh)
1292 struct nfs_fattr *fattr;
1295 BUG_ON(!server->nfs_client);
1296 BUG_ON(!server->nfs_client->rpc_ops);
1297 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1299 fattr = nfs_alloc_fattr();
1303 /* We must ensure the session is initialised first */
1304 error = nfs4_init_session(server);
1308 /* Probe the root fh to retrieve its FSID and filehandle */
1309 error = nfs4_get_rootfh(server, mntfh);
1313 dprintk("Server FSID: %llx:%llx\n",
1314 (unsigned long long) server->fsid.major,
1315 (unsigned long long) server->fsid.minor);
1316 dprintk("Mount FH: %d\n", mntfh->size);
1318 nfs4_session_set_rwsize(server);
1320 error = nfs_probe_fsinfo(server, mntfh, fattr);
1324 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1325 server->namelen = NFS4_MAXNAMLEN;
1327 spin_lock(&nfs_client_lock);
1328 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1329 list_add_tail(&server->master_link, &nfs_volume_list);
1330 spin_unlock(&nfs_client_lock);
1332 server->mount_time = jiffies;
1334 nfs_free_fattr(fattr);
1339 * Create a version 4 volume record
1341 static int nfs4_init_server(struct nfs_server *server,
1342 const struct nfs_parsed_mount_data *data)
1344 struct rpc_timeout timeparms;
1347 dprintk("--> nfs4_init_server()\n");
1349 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1350 data->timeo, data->retrans);
1352 /* Initialise the client representation from the mount data */
1353 server->flags = data->flags;
1354 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|
1356 server->options = data->options;
1358 /* Get a client record */
1359 error = nfs4_set_client(server,
1360 data->nfs_server.hostname,
1361 (const struct sockaddr *)&data->nfs_server.address,
1362 data->nfs_server.addrlen,
1363 data->client_address,
1364 data->auth_flavors[0],
1365 data->nfs_server.protocol,
1367 data->minorversion);
1372 server->rsize = nfs_block_size(data->rsize, NULL);
1374 server->wsize = nfs_block_size(data->wsize, NULL);
1376 server->acregmin = data->acregmin * HZ;
1377 server->acregmax = data->acregmax * HZ;
1378 server->acdirmin = data->acdirmin * HZ;
1379 server->acdirmax = data->acdirmax * HZ;
1381 server->port = data->nfs_server.port;
1383 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1387 dprintk("<-- nfs4_init_server() = %d\n", error);
1392 * Create a version 4 volume record
1393 * - keyed on server and FSID
1395 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1396 struct nfs_fh *mntfh)
1398 struct nfs_server *server;
1401 dprintk("--> nfs4_create_server()\n");
1403 server = nfs_alloc_server();
1405 return ERR_PTR(-ENOMEM);
1407 /* set up the general RPC client */
1408 error = nfs4_init_server(server, data);
1412 error = nfs4_server_common_setup(server, mntfh);
1416 dprintk("<-- nfs4_create_server() = %p\n", server);
1420 nfs_free_server(server);
1421 dprintk("<-- nfs4_create_server() = error %d\n", error);
1422 return ERR_PTR(error);
1426 * Create an NFS4 referral server record
1428 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1429 struct nfs_fh *mntfh)
1431 struct nfs_client *parent_client;
1432 struct nfs_server *server, *parent_server;
1435 dprintk("--> nfs4_create_referral_server()\n");
1437 server = nfs_alloc_server();
1439 return ERR_PTR(-ENOMEM);
1441 parent_server = NFS_SB(data->sb);
1442 parent_client = parent_server->nfs_client;
1444 /* Initialise the client representation from the parent server */
1445 nfs_server_copy_userdata(server, parent_server);
1446 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1448 /* Get a client representation.
1449 * Note: NFSv4 always uses TCP, */
1450 error = nfs4_set_client(server, data->hostname,
1453 parent_client->cl_ipaddr,
1455 parent_server->client->cl_xprt->prot,
1456 parent_server->client->cl_timeout,
1457 parent_client->cl_minorversion);
1461 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1465 error = nfs4_server_common_setup(server, mntfh);
1469 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1473 nfs_free_server(server);
1474 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1475 return ERR_PTR(error);
1478 #endif /* CONFIG_NFS_V4 */
1481 * Clone an NFS2, NFS3 or NFS4 server record
1483 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1485 struct nfs_fattr *fattr)
1487 struct nfs_server *server;
1488 struct nfs_fattr *fattr_fsinfo;
1491 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1492 (unsigned long long) fattr->fsid.major,
1493 (unsigned long long) fattr->fsid.minor);
1495 server = nfs_alloc_server();
1497 return ERR_PTR(-ENOMEM);
1500 fattr_fsinfo = nfs_alloc_fattr();
1501 if (fattr_fsinfo == NULL)
1502 goto out_free_server;
1504 /* Copy data from the source */
1505 server->nfs_client = source->nfs_client;
1506 atomic_inc(&server->nfs_client->cl_count);
1507 nfs_server_copy_userdata(server, source);
1509 server->fsid = fattr->fsid;
1511 error = nfs_init_server_rpcclient(server,
1512 source->client->cl_timeout,
1513 source->client->cl_auth->au_flavor);
1515 goto out_free_server;
1516 if (!IS_ERR(source->client_acl))
1517 nfs_init_server_aclclient(server);
1519 /* probe the filesystem info for this server filesystem */
1520 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1522 goto out_free_server;
1524 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1525 server->namelen = NFS4_MAXNAMLEN;
1527 dprintk("Cloned FSID: %llx:%llx\n",
1528 (unsigned long long) server->fsid.major,
1529 (unsigned long long) server->fsid.minor);
1531 error = nfs_start_lockd(server);
1533 goto out_free_server;
1535 spin_lock(&nfs_client_lock);
1536 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1537 list_add_tail(&server->master_link, &nfs_volume_list);
1538 spin_unlock(&nfs_client_lock);
1540 server->mount_time = jiffies;
1542 nfs_free_fattr(fattr_fsinfo);
1543 dprintk("<-- nfs_clone_server() = %p\n", server);
1547 nfs_free_fattr(fattr_fsinfo);
1548 nfs_free_server(server);
1549 dprintk("<-- nfs_clone_server() = error %d\n", error);
1550 return ERR_PTR(error);
1553 #ifdef CONFIG_PROC_FS
1554 static struct proc_dir_entry *proc_fs_nfs;
1556 static int nfs_server_list_open(struct inode *inode, struct file *file);
1557 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1558 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1559 static void nfs_server_list_stop(struct seq_file *p, void *v);
1560 static int nfs_server_list_show(struct seq_file *m, void *v);
1562 static const struct seq_operations nfs_server_list_ops = {
1563 .start = nfs_server_list_start,
1564 .next = nfs_server_list_next,
1565 .stop = nfs_server_list_stop,
1566 .show = nfs_server_list_show,
1569 static const struct file_operations nfs_server_list_fops = {
1570 .open = nfs_server_list_open,
1572 .llseek = seq_lseek,
1573 .release = seq_release,
1574 .owner = THIS_MODULE,
1577 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1578 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1579 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1580 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1581 static int nfs_volume_list_show(struct seq_file *m, void *v);
1583 static const struct seq_operations nfs_volume_list_ops = {
1584 .start = nfs_volume_list_start,
1585 .next = nfs_volume_list_next,
1586 .stop = nfs_volume_list_stop,
1587 .show = nfs_volume_list_show,
1590 static const struct file_operations nfs_volume_list_fops = {
1591 .open = nfs_volume_list_open,
1593 .llseek = seq_lseek,
1594 .release = seq_release,
1595 .owner = THIS_MODULE,
1599 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1602 static int nfs_server_list_open(struct inode *inode, struct file *file)
1607 ret = seq_open(file, &nfs_server_list_ops);
1611 m = file->private_data;
1612 m->private = PDE(inode)->data;
1618 * set up the iterator to start reading from the server list and return the first item
1620 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1622 /* lock the list against modification */
1623 spin_lock(&nfs_client_lock);
1624 return seq_list_start_head(&nfs_client_list, *_pos);
1628 * move to next server
1630 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1632 return seq_list_next(v, &nfs_client_list, pos);
1636 * clean up after reading from the transports list
1638 static void nfs_server_list_stop(struct seq_file *p, void *v)
1640 spin_unlock(&nfs_client_lock);
1644 * display a header line followed by a load of call lines
1646 static int nfs_server_list_show(struct seq_file *m, void *v)
1648 struct nfs_client *clp;
1650 /* display header on line 1 */
1651 if (v == &nfs_client_list) {
1652 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1656 /* display one transport per line on subsequent lines */
1657 clp = list_entry(v, struct nfs_client, cl_share_link);
1659 seq_printf(m, "v%u %s %s %3d %s\n",
1660 clp->rpc_ops->version,
1661 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1662 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1663 atomic_read(&clp->cl_count),
1670 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1672 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1677 ret = seq_open(file, &nfs_volume_list_ops);
1681 m = file->private_data;
1682 m->private = PDE(inode)->data;
1688 * set up the iterator to start reading from the volume list and return the first item
1690 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1692 /* lock the list against modification */
1693 spin_lock(&nfs_client_lock);
1694 return seq_list_start_head(&nfs_volume_list, *_pos);
1698 * move to next volume
1700 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1702 return seq_list_next(v, &nfs_volume_list, pos);
1706 * clean up after reading from the transports list
1708 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1710 spin_unlock(&nfs_client_lock);
1714 * display a header line followed by a load of call lines
1716 static int nfs_volume_list_show(struct seq_file *m, void *v)
1718 struct nfs_server *server;
1719 struct nfs_client *clp;
1720 char dev[8], fsid[17];
1722 /* display header on line 1 */
1723 if (v == &nfs_volume_list) {
1724 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
1727 /* display one transport per line on subsequent lines */
1728 server = list_entry(v, struct nfs_server, master_link);
1729 clp = server->nfs_client;
1731 snprintf(dev, 8, "%u:%u",
1732 MAJOR(server->s_dev), MINOR(server->s_dev));
1734 snprintf(fsid, 17, "%llx:%llx",
1735 (unsigned long long) server->fsid.major,
1736 (unsigned long long) server->fsid.minor);
1738 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1739 clp->rpc_ops->version,
1740 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1741 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1744 nfs_server_fscache_state(server));
1750 * initialise the /proc/fs/nfsfs/ directory
1752 int __init nfs_fs_proc_init(void)
1754 struct proc_dir_entry *p;
1756 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1760 /* a file of servers with which we're dealing */
1761 p = proc_create("servers", S_IFREG|S_IRUGO,
1762 proc_fs_nfs, &nfs_server_list_fops);
1766 /* a file of volumes that we have mounted */
1767 p = proc_create("volumes", S_IFREG|S_IRUGO,
1768 proc_fs_nfs, &nfs_volume_list_fops);
1774 remove_proc_entry("servers", proc_fs_nfs);
1776 remove_proc_entry("fs/nfsfs", NULL);
1782 * clean up the /proc/fs/nfsfs/ directory
1784 void nfs_fs_proc_exit(void)
1786 remove_proc_entry("volumes", proc_fs_nfs);
1787 remove_proc_entry("servers", proc_fs_nfs);
1788 remove_proc_entry("fs/nfsfs", NULL);
1791 #endif /* CONFIG_PROC_FS */