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>
39 #include <linux/nfs_xdr.h>
41 #include <asm/system.h>
45 #include "delegation.h"
50 #define NFSDBG_FACILITY NFSDBG_CLIENT
52 static DEFINE_SPINLOCK(nfs_client_lock);
53 static LIST_HEAD(nfs_client_list);
54 static LIST_HEAD(nfs_volume_list);
55 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
60 static struct rpc_version *nfs_version[5] = {
70 struct rpc_program nfs_program = {
72 .number = NFS_PROGRAM,
73 .nrvers = ARRAY_SIZE(nfs_version),
74 .version = nfs_version,
75 .stats = &nfs_rpcstat,
76 .pipe_dir_name = "/nfs",
79 struct rpc_stat nfs_rpcstat = {
80 .program = &nfs_program
84 #ifdef CONFIG_NFS_V3_ACL
85 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
86 static struct rpc_version * nfsacl_version[] = {
87 [3] = &nfsacl_version3,
90 struct rpc_program nfsacl_program = {
92 .number = NFS_ACL_PROGRAM,
93 .nrvers = ARRAY_SIZE(nfsacl_version),
94 .version = nfsacl_version,
95 .stats = &nfsacl_rpcstat,
97 #endif /* CONFIG_NFS_V3_ACL */
99 struct nfs_client_initdata {
100 const char *hostname;
101 const struct sockaddr *addr;
103 const struct nfs_rpc_ops *rpc_ops;
109 * Allocate a shared client record
111 * Since these are allocated/deallocated very rarely, we don't
112 * bother putting them in a slab cache...
114 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
116 struct nfs_client *clp;
117 struct rpc_cred *cred;
119 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
122 clp->rpc_ops = cl_init->rpc_ops;
124 if (cl_init->rpc_ops->version == 4) {
125 if (nfs_callback_up() < 0)
127 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
130 atomic_set(&clp->cl_count, 1);
131 clp->cl_cons_state = NFS_CS_INITING;
133 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
134 clp->cl_addrlen = cl_init->addrlen;
136 if (cl_init->hostname) {
137 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
138 if (!clp->cl_hostname)
142 INIT_LIST_HEAD(&clp->cl_superblocks);
143 clp->cl_rpcclient = ERR_PTR(-EINVAL);
145 clp->cl_proto = cl_init->proto;
148 INIT_LIST_HEAD(&clp->cl_delegations);
149 spin_lock_init(&clp->cl_lock);
150 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
151 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
152 clp->cl_boot_time = CURRENT_TIME;
153 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
154 clp->cl_minorversion = cl_init->minorversion;
156 cred = rpc_lookup_machine_cred();
158 clp->cl_machine_cred = cred;
160 nfs_fscache_get_client_cookie(clp);
165 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
173 static void nfs4_shutdown_client(struct nfs_client *clp)
176 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
177 nfs4_kill_renewd(clp);
178 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
179 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
180 nfs_idmap_delete(clp);
182 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
187 * Clears/puts all minor version specific parts from an nfs_client struct
188 * reverting it to minorversion 0.
190 static void nfs4_clear_client_minor_version(struct nfs_client *clp)
192 #ifdef CONFIG_NFS_V4_1
193 if (nfs4_has_session(clp)) {
194 nfs4_destroy_session(clp->cl_session);
195 clp->cl_session = NULL;
197 #endif /* CONFIG_NFS_V4_1 */
201 * Destroy a shared client record
203 static void nfs_free_client(struct nfs_client *clp)
205 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
207 nfs4_clear_client_minor_version(clp);
208 nfs4_shutdown_client(clp);
210 nfs_fscache_release_client_cookie(clp);
212 /* -EIO all pending I/O */
213 if (!IS_ERR(clp->cl_rpcclient))
214 rpc_shutdown_client(clp->cl_rpcclient);
216 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
219 if (clp->cl_machine_cred != NULL)
220 put_rpccred(clp->cl_machine_cred);
222 kfree(clp->cl_hostname);
225 dprintk("<-- nfs_free_client()\n");
229 * Release a reference to a shared client record
231 void nfs_put_client(struct nfs_client *clp)
236 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
238 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
239 list_del(&clp->cl_share_link);
240 spin_unlock(&nfs_client_lock);
242 BUG_ON(!list_empty(&clp->cl_superblocks));
244 nfs_free_client(clp);
248 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
250 * Test if two ip6 socket addresses refer to the same socket by
251 * comparing relevant fields. The padding bytes specifically, are not
252 * compared. sin6_flowinfo is not compared because it only affects QoS
253 * and sin6_scope_id is only compared if the address is "link local"
254 * because "link local" addresses need only be unique to a specific
255 * link. Conversely, ordinary unicast addresses might have different
258 * The caller should ensure both socket addresses are AF_INET6.
260 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
261 const struct sockaddr *sa2)
263 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
264 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
266 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
267 sin1->sin6_scope_id != sin2->sin6_scope_id)
270 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
272 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
273 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
274 const struct sockaddr *sa2)
281 * Test if two ip4 socket addresses refer to the same socket, by
282 * comparing relevant fields. The padding bytes specifically, are
285 * The caller should ensure both socket addresses are AF_INET.
287 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
288 const struct sockaddr *sa2)
290 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
291 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
293 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
296 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
297 const struct sockaddr *sa2)
299 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
300 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
302 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
303 (sin1->sin6_port == sin2->sin6_port);
306 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
307 const struct sockaddr *sa2)
309 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
310 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
312 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
313 (sin1->sin_port == sin2->sin_port);
317 * Test if two socket addresses represent the same actual socket,
318 * by comparing (only) relevant fields, excluding the port number.
320 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
321 const struct sockaddr *sa2)
323 if (sa1->sa_family != sa2->sa_family)
326 switch (sa1->sa_family) {
328 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
330 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
336 * Test if two socket addresses represent the same actual socket,
337 * by comparing (only) relevant fields, including the port number.
339 static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
340 const struct sockaddr *sa2)
342 if (sa1->sa_family != sa2->sa_family)
345 switch (sa1->sa_family) {
347 return nfs_sockaddr_cmp_ip4(sa1, sa2);
349 return nfs_sockaddr_cmp_ip6(sa1, sa2);
355 * Find a client by IP address and protocol version
356 * - returns NULL if no such client
358 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
360 struct nfs_client *clp;
362 spin_lock(&nfs_client_lock);
363 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
364 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
366 /* Don't match clients that failed to initialise properly */
367 if (clp->cl_cons_state != NFS_CS_READY)
370 /* Different NFS versions cannot share the same nfs_client */
371 if (clp->rpc_ops->version != nfsversion)
374 /* Match only the IP address, not the port number */
375 if (!nfs_sockaddr_match_ipaddr(addr, clap))
378 atomic_inc(&clp->cl_count);
379 spin_unlock(&nfs_client_lock);
382 spin_unlock(&nfs_client_lock);
387 * Find a client by IP address and protocol version
388 * - returns NULL if no such client
390 struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
392 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
393 u32 nfsvers = clp->rpc_ops->version;
395 spin_lock(&nfs_client_lock);
396 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
397 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
399 /* Don't match clients that failed to initialise properly */
400 if (clp->cl_cons_state != NFS_CS_READY)
403 /* Different NFS versions cannot share the same nfs_client */
404 if (clp->rpc_ops->version != nfsvers)
407 /* Match only the IP address, not the port number */
408 if (!nfs_sockaddr_match_ipaddr(sap, clap))
411 atomic_inc(&clp->cl_count);
412 spin_unlock(&nfs_client_lock);
415 spin_unlock(&nfs_client_lock);
420 * Find an nfs_client on the list that matches the initialisation data
423 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
425 struct nfs_client *clp;
426 const struct sockaddr *sap = data->addr;
428 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
429 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
430 /* Don't match clients that failed to initialise properly */
431 if (clp->cl_cons_state < 0)
434 /* Different NFS versions cannot share the same nfs_client */
435 if (clp->rpc_ops != data->rpc_ops)
438 if (clp->cl_proto != data->proto)
440 /* Match nfsv4 minorversion */
441 if (clp->cl_minorversion != data->minorversion)
443 /* Match the full socket address */
444 if (!nfs_sockaddr_cmp(sap, clap))
447 atomic_inc(&clp->cl_count);
454 * Look up a client by IP address and protocol version
455 * - creates a new record if one doesn't yet exist
457 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
459 struct nfs_client *clp, *new = NULL;
462 dprintk("--> nfs_get_client(%s,v%u)\n",
463 cl_init->hostname ?: "", cl_init->rpc_ops->version);
465 /* see if the client already exists */
467 spin_lock(&nfs_client_lock);
469 clp = nfs_match_client(cl_init);
475 spin_unlock(&nfs_client_lock);
477 new = nfs_alloc_client(cl_init);
480 return ERR_PTR(-ENOMEM);
482 /* install a new client and return with it unready */
485 list_add(&clp->cl_share_link, &nfs_client_list);
486 spin_unlock(&nfs_client_lock);
487 dprintk("--> nfs_get_client() = %p [new]\n", clp);
490 /* found an existing client
491 * - make sure it's ready before returning
494 spin_unlock(&nfs_client_lock);
497 nfs_free_client(new);
499 error = wait_event_killable(nfs_client_active_wq,
500 clp->cl_cons_state != NFS_CS_INITING);
503 return ERR_PTR(-ERESTARTSYS);
506 if (clp->cl_cons_state < NFS_CS_READY) {
507 error = clp->cl_cons_state;
509 return ERR_PTR(error);
512 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
514 dprintk("--> nfs_get_client() = %p [share]\n", clp);
519 * Mark a server as ready or failed
521 static void nfs_mark_client_ready(struct nfs_client *clp, int state)
523 clp->cl_cons_state = state;
524 wake_up_all(&nfs_client_active_wq);
528 * Initialise the timeout values for a connection
530 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
531 unsigned int timeo, unsigned int retrans)
533 to->to_initval = timeo * HZ / 10;
534 to->to_retries = retrans;
537 case XPRT_TRANSPORT_TCP:
538 case XPRT_TRANSPORT_RDMA:
539 if (to->to_retries == 0)
540 to->to_retries = NFS_DEF_TCP_RETRANS;
541 if (to->to_initval == 0)
542 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
543 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
544 to->to_initval = NFS_MAX_TCP_TIMEOUT;
545 to->to_increment = to->to_initval;
546 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
547 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
548 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
549 if (to->to_maxval < to->to_initval)
550 to->to_maxval = to->to_initval;
551 to->to_exponential = 0;
553 case XPRT_TRANSPORT_UDP:
554 if (to->to_retries == 0)
555 to->to_retries = NFS_DEF_UDP_RETRANS;
557 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
558 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
559 to->to_initval = NFS_MAX_UDP_TIMEOUT;
560 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
561 to->to_exponential = 1;
569 * Create an RPC client handle
571 static int nfs_create_rpc_client(struct nfs_client *clp,
572 const struct rpc_timeout *timeparms,
573 rpc_authflavor_t flavor,
574 int discrtry, int noresvport)
576 struct rpc_clnt *clnt = NULL;
577 struct rpc_create_args args = {
578 .protocol = clp->cl_proto,
579 .address = (struct sockaddr *)&clp->cl_addr,
580 .addrsize = clp->cl_addrlen,
581 .timeout = timeparms,
582 .servername = clp->cl_hostname,
583 .program = &nfs_program,
584 .version = clp->rpc_ops->version,
585 .authflavor = flavor,
589 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
591 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
593 if (!IS_ERR(clp->cl_rpcclient))
596 clnt = rpc_create(&args);
598 dprintk("%s: cannot create RPC client. Error = %ld\n",
599 __func__, PTR_ERR(clnt));
600 return PTR_ERR(clnt);
603 clp->cl_rpcclient = clnt;
608 * Version 2 or 3 client destruction
610 static void nfs_destroy_server(struct nfs_server *server)
612 if (!(server->flags & NFS_MOUNT_NONLM))
613 nlmclnt_done(server->nlm_host);
617 * Version 2 or 3 lockd setup
619 static int nfs_start_lockd(struct nfs_server *server)
621 struct nlm_host *host;
622 struct nfs_client *clp = server->nfs_client;
623 struct nlmclnt_initdata nlm_init = {
624 .hostname = clp->cl_hostname,
625 .address = (struct sockaddr *)&clp->cl_addr,
626 .addrlen = clp->cl_addrlen,
627 .protocol = server->flags & NFS_MOUNT_TCP ?
628 IPPROTO_TCP : IPPROTO_UDP,
629 .nfs_version = clp->rpc_ops->version,
630 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
634 if (nlm_init.nfs_version > 3)
636 if (server->flags & NFS_MOUNT_NONLM)
639 host = nlmclnt_init(&nlm_init);
641 return PTR_ERR(host);
643 server->nlm_host = host;
644 server->destroy = nfs_destroy_server;
649 * Initialise an NFSv3 ACL client connection
651 #ifdef CONFIG_NFS_V3_ACL
652 static void nfs_init_server_aclclient(struct nfs_server *server)
654 if (server->nfs_client->rpc_ops->version != 3)
656 if (server->flags & NFS_MOUNT_NOACL)
659 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
660 if (IS_ERR(server->client_acl))
663 /* No errors! Assume that Sun nfsacls are supported */
664 server->caps |= NFS_CAP_ACLS;
668 server->caps &= ~NFS_CAP_ACLS;
671 static inline void nfs_init_server_aclclient(struct nfs_server *server)
673 server->flags &= ~NFS_MOUNT_NOACL;
674 server->caps &= ~NFS_CAP_ACLS;
679 * Create a general RPC client
681 static int nfs_init_server_rpcclient(struct nfs_server *server,
682 const struct rpc_timeout *timeo,
683 rpc_authflavor_t pseudoflavour)
685 struct nfs_client *clp = server->nfs_client;
687 server->client = rpc_clone_client(clp->cl_rpcclient);
688 if (IS_ERR(server->client)) {
689 dprintk("%s: couldn't create rpc_client!\n", __func__);
690 return PTR_ERR(server->client);
693 memcpy(&server->client->cl_timeout_default,
695 sizeof(server->client->cl_timeout_default));
696 server->client->cl_timeout = &server->client->cl_timeout_default;
698 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
699 struct rpc_auth *auth;
701 auth = rpcauth_create(pseudoflavour, server->client);
703 dprintk("%s: couldn't create credcache!\n", __func__);
704 return PTR_ERR(auth);
707 server->client->cl_softrtry = 0;
708 if (server->flags & NFS_MOUNT_SOFT)
709 server->client->cl_softrtry = 1;
715 * Initialise an NFS2 or NFS3 client
717 static int nfs_init_client(struct nfs_client *clp,
718 const struct rpc_timeout *timeparms,
719 const struct nfs_parsed_mount_data *data)
723 if (clp->cl_cons_state == NFS_CS_READY) {
724 /* the client is already initialised */
725 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
730 * Create a client RPC handle for doing FSSTAT with UNIX auth only
731 * - RFC 2623, sec 2.3.2
733 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
734 0, data->flags & NFS_MOUNT_NORESVPORT);
737 nfs_mark_client_ready(clp, NFS_CS_READY);
741 nfs_mark_client_ready(clp, error);
742 dprintk("<-- nfs_init_client() = xerror %d\n", error);
747 * Create a version 2 or 3 client
749 static int nfs_init_server(struct nfs_server *server,
750 const struct nfs_parsed_mount_data *data)
752 struct nfs_client_initdata cl_init = {
753 .hostname = data->nfs_server.hostname,
754 .addr = (const struct sockaddr *)&data->nfs_server.address,
755 .addrlen = data->nfs_server.addrlen,
756 .rpc_ops = &nfs_v2_clientops,
757 .proto = data->nfs_server.protocol,
759 struct rpc_timeout timeparms;
760 struct nfs_client *clp;
763 dprintk("--> nfs_init_server()\n");
766 if (data->flags & NFS_MOUNT_VER3)
767 cl_init.rpc_ops = &nfs_v3_clientops;
770 /* Allocate or find a client reference we can use */
771 clp = nfs_get_client(&cl_init);
773 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
777 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
778 data->timeo, data->retrans);
779 error = nfs_init_client(clp, &timeparms, data);
783 server->nfs_client = clp;
785 /* Initialise the client representation from the mount data */
786 server->flags = data->flags;
787 server->options = data->options;
790 server->rsize = nfs_block_size(data->rsize, NULL);
792 server->wsize = nfs_block_size(data->wsize, NULL);
794 server->acregmin = data->acregmin * HZ;
795 server->acregmax = data->acregmax * HZ;
796 server->acdirmin = data->acdirmin * HZ;
797 server->acdirmax = data->acdirmax * HZ;
799 /* Start lockd here, before we might error out */
800 error = nfs_start_lockd(server);
804 server->port = data->nfs_server.port;
806 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
810 /* Preserve the values of mount_server-related mount options */
811 if (data->mount_server.addrlen) {
812 memcpy(&server->mountd_address, &data->mount_server.address,
813 data->mount_server.addrlen);
814 server->mountd_addrlen = data->mount_server.addrlen;
816 server->mountd_version = data->mount_server.version;
817 server->mountd_port = data->mount_server.port;
818 server->mountd_protocol = data->mount_server.protocol;
820 server->namelen = data->namlen;
821 /* Create a client RPC handle for the NFSv3 ACL management interface */
822 nfs_init_server_aclclient(server);
823 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
827 server->nfs_client = NULL;
829 dprintk("<-- nfs_init_server() = xerror %d\n", error);
834 * Load up the server record from information gained in an fsinfo record
836 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
838 unsigned long max_rpc_payload;
840 /* Work out a lot of parameters */
841 if (server->rsize == 0)
842 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
843 if (server->wsize == 0)
844 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
846 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
847 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
848 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
849 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
851 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
852 if (server->rsize > max_rpc_payload)
853 server->rsize = max_rpc_payload;
854 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
855 server->rsize = NFS_MAX_FILE_IO_SIZE;
856 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
858 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
860 if (server->wsize > max_rpc_payload)
861 server->wsize = max_rpc_payload;
862 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
863 server->wsize = NFS_MAX_FILE_IO_SIZE;
864 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
865 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
867 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
868 if (server->dtsize > PAGE_CACHE_SIZE)
869 server->dtsize = PAGE_CACHE_SIZE;
870 if (server->dtsize > server->rsize)
871 server->dtsize = server->rsize;
873 if (server->flags & NFS_MOUNT_NOAC) {
874 server->acregmin = server->acregmax = 0;
875 server->acdirmin = server->acdirmax = 0;
878 server->maxfilesize = fsinfo->maxfilesize;
880 /* We're airborne Set socket buffersize */
881 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
885 * Probe filesystem information, including the FSID on v2/v3
887 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
889 struct nfs_fsinfo fsinfo;
890 struct nfs_client *clp = server->nfs_client;
893 dprintk("--> nfs_probe_fsinfo()\n");
895 if (clp->rpc_ops->set_capabilities != NULL) {
896 error = clp->rpc_ops->set_capabilities(server, mntfh);
901 fsinfo.fattr = fattr;
902 nfs_fattr_init(fattr);
903 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
907 nfs_server_set_fsinfo(server, &fsinfo);
908 error = bdi_init(&server->backing_dev_info);
913 /* Get some general file system info */
914 if (server->namelen == 0) {
915 struct nfs_pathconf pathinfo;
917 pathinfo.fattr = fattr;
918 nfs_fattr_init(fattr);
920 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
921 server->namelen = pathinfo.max_namelen;
924 dprintk("<-- nfs_probe_fsinfo() = 0\n");
928 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
933 * Copy useful information when duplicating a server record
935 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
937 target->flags = source->flags;
938 target->acregmin = source->acregmin;
939 target->acregmax = source->acregmax;
940 target->acdirmin = source->acdirmin;
941 target->acdirmax = source->acdirmax;
942 target->caps = source->caps;
946 * Allocate and initialise a server record
948 static struct nfs_server *nfs_alloc_server(void)
950 struct nfs_server *server;
952 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
956 server->client = server->client_acl = ERR_PTR(-EINVAL);
958 /* Zero out the NFS state stuff */
959 INIT_LIST_HEAD(&server->client_link);
960 INIT_LIST_HEAD(&server->master_link);
962 atomic_set(&server->active, 0);
964 server->io_stats = nfs_alloc_iostats();
965 if (!server->io_stats) {
974 * Free up a server record
976 void nfs_free_server(struct nfs_server *server)
978 dprintk("--> nfs_free_server()\n");
980 spin_lock(&nfs_client_lock);
981 list_del(&server->client_link);
982 list_del(&server->master_link);
983 spin_unlock(&nfs_client_lock);
985 if (server->destroy != NULL)
986 server->destroy(server);
988 if (!IS_ERR(server->client_acl))
989 rpc_shutdown_client(server->client_acl);
990 if (!IS_ERR(server->client))
991 rpc_shutdown_client(server->client);
993 nfs_put_client(server->nfs_client);
995 nfs_free_iostats(server->io_stats);
996 bdi_destroy(&server->backing_dev_info);
998 nfs_release_automount_timer();
999 dprintk("<-- nfs_free_server()\n");
1003 * Create a version 2 or 3 volume record
1004 * - keyed on server and FSID
1006 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1007 struct nfs_fh *mntfh)
1009 struct nfs_server *server;
1010 struct nfs_fattr fattr;
1013 server = nfs_alloc_server();
1015 return ERR_PTR(-ENOMEM);
1017 /* Get a client representation */
1018 error = nfs_init_server(server, data);
1022 BUG_ON(!server->nfs_client);
1023 BUG_ON(!server->nfs_client->rpc_ops);
1024 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1026 /* Probe the root fh to retrieve its FSID */
1027 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1030 if (server->nfs_client->rpc_ops->version == 3) {
1031 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1032 server->namelen = NFS3_MAXNAMLEN;
1033 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1034 server->caps |= NFS_CAP_READDIRPLUS;
1036 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1037 server->namelen = NFS2_MAXNAMLEN;
1040 if (!(fattr.valid & NFS_ATTR_FATTR)) {
1041 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
1043 dprintk("nfs_create_server: getattr error = %d\n", -error);
1047 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
1049 dprintk("Server FSID: %llx:%llx\n",
1050 (unsigned long long) server->fsid.major,
1051 (unsigned long long) server->fsid.minor);
1053 BUG_ON(!server->nfs_client);
1054 BUG_ON(!server->nfs_client->rpc_ops);
1055 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1057 spin_lock(&nfs_client_lock);
1058 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1059 list_add_tail(&server->master_link, &nfs_volume_list);
1060 spin_unlock(&nfs_client_lock);
1062 server->mount_time = jiffies;
1066 nfs_free_server(server);
1067 return ERR_PTR(error);
1070 #ifdef CONFIG_NFS_V4
1072 * Initialize the minor version specific parts of an NFS4 client record
1074 static int nfs4_init_client_minor_version(struct nfs_client *clp)
1076 #if defined(CONFIG_NFS_V4_1)
1077 if (clp->cl_minorversion) {
1078 struct nfs4_session *session = NULL;
1080 * Create the session and mark it expired.
1081 * When a SEQUENCE operation encounters the expired session
1082 * it will do session recovery to initialize it.
1084 session = nfs4_alloc_session(clp);
1088 clp->cl_session = session;
1090 #endif /* CONFIG_NFS_V4_1 */
1096 * Initialise an NFS4 client record
1098 static int nfs4_init_client(struct nfs_client *clp,
1099 const struct rpc_timeout *timeparms,
1100 const char *ip_addr,
1101 rpc_authflavor_t authflavour,
1106 if (clp->cl_cons_state == NFS_CS_READY) {
1107 /* the client is initialised already */
1108 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1112 /* Check NFS protocol revision and initialize RPC op vector */
1113 clp->rpc_ops = &nfs_v4_clientops;
1115 error = nfs_create_rpc_client(clp, timeparms, authflavour,
1116 1, flags & NFS_MOUNT_NORESVPORT);
1119 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1121 error = nfs_idmap_new(clp);
1123 dprintk("%s: failed to create idmapper. Error = %d\n",
1127 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1129 error = nfs4_init_client_minor_version(clp);
1133 nfs_mark_client_ready(clp, NFS_CS_READY);
1137 nfs_mark_client_ready(clp, error);
1138 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1143 * Set up an NFS4 client
1145 static int nfs4_set_client(struct nfs_server *server,
1146 const char *hostname,
1147 const struct sockaddr *addr,
1148 const size_t addrlen,
1149 const char *ip_addr,
1150 rpc_authflavor_t authflavour,
1151 int proto, const struct rpc_timeout *timeparms,
1154 struct nfs_client_initdata cl_init = {
1155 .hostname = hostname,
1158 .rpc_ops = &nfs_v4_clientops,
1160 .minorversion = minorversion,
1162 struct nfs_client *clp;
1165 dprintk("--> nfs4_set_client()\n");
1167 /* Allocate or find a client reference we can use */
1168 clp = nfs_get_client(&cl_init);
1170 error = PTR_ERR(clp);
1173 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
1178 server->nfs_client = clp;
1179 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1183 nfs_put_client(clp);
1185 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1190 * Initialize a session.
1191 * Note: save the mount rsize and wsize for create_server negotiation.
1193 static void nfs4_init_session(struct nfs_client *clp,
1194 unsigned int wsize, unsigned int rsize)
1196 #if defined(CONFIG_NFS_V4_1)
1197 if (nfs4_has_session(clp)) {
1198 clp->cl_session->fc_attrs.max_rqst_sz = wsize;
1199 clp->cl_session->fc_attrs.max_resp_sz = rsize;
1201 #endif /* CONFIG_NFS_V4_1 */
1205 * Create a version 4 volume record
1207 static int nfs4_init_server(struct nfs_server *server,
1208 const struct nfs_parsed_mount_data *data)
1210 struct rpc_timeout timeparms;
1213 dprintk("--> nfs4_init_server()\n");
1215 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1216 data->timeo, data->retrans);
1218 /* Initialise the client representation from the mount data */
1219 server->flags = data->flags;
1220 server->caps |= NFS_CAP_ATOMIC_OPEN;
1221 server->options = data->options;
1223 /* Get a client record */
1224 error = nfs4_set_client(server,
1225 data->nfs_server.hostname,
1226 (const struct sockaddr *)&data->nfs_server.address,
1227 data->nfs_server.addrlen,
1228 data->client_address,
1229 data->auth_flavors[0],
1230 data->nfs_server.protocol,
1232 data->minorversion);
1237 server->rsize = nfs_block_size(data->rsize, NULL);
1239 server->wsize = nfs_block_size(data->wsize, NULL);
1241 server->acregmin = data->acregmin * HZ;
1242 server->acregmax = data->acregmax * HZ;
1243 server->acdirmin = data->acdirmin * HZ;
1244 server->acdirmax = data->acdirmax * HZ;
1246 server->port = data->nfs_server.port;
1248 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1252 dprintk("<-- nfs4_init_server() = %d\n", error);
1257 * Create a version 4 volume record
1258 * - keyed on server and FSID
1260 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1261 struct nfs_fh *mntfh)
1263 struct nfs_fattr fattr;
1264 struct nfs_server *server;
1267 dprintk("--> nfs4_create_server()\n");
1269 server = nfs_alloc_server();
1271 return ERR_PTR(-ENOMEM);
1273 /* set up the general RPC client */
1274 error = nfs4_init_server(server, data);
1278 BUG_ON(!server->nfs_client);
1279 BUG_ON(!server->nfs_client->rpc_ops);
1280 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1282 nfs4_init_session(server->nfs_client, server->wsize, server->rsize);
1284 /* Probe the root fh to retrieve its FSID */
1285 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1289 dprintk("Server FSID: %llx:%llx\n",
1290 (unsigned long long) server->fsid.major,
1291 (unsigned long long) server->fsid.minor);
1292 dprintk("Mount FH: %d\n", mntfh->size);
1294 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1298 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1299 server->namelen = NFS4_MAXNAMLEN;
1301 BUG_ON(!server->nfs_client);
1302 BUG_ON(!server->nfs_client->rpc_ops);
1303 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1305 spin_lock(&nfs_client_lock);
1306 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1307 list_add_tail(&server->master_link, &nfs_volume_list);
1308 spin_unlock(&nfs_client_lock);
1310 server->mount_time = jiffies;
1311 dprintk("<-- nfs4_create_server() = %p\n", server);
1315 nfs_free_server(server);
1316 dprintk("<-- nfs4_create_server() = error %d\n", error);
1317 return ERR_PTR(error);
1321 * Create an NFS4 referral server record
1323 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1324 struct nfs_fh *mntfh)
1326 struct nfs_client *parent_client;
1327 struct nfs_server *server, *parent_server;
1328 struct nfs_fattr fattr;
1331 dprintk("--> nfs4_create_referral_server()\n");
1333 server = nfs_alloc_server();
1335 return ERR_PTR(-ENOMEM);
1337 parent_server = NFS_SB(data->sb);
1338 parent_client = parent_server->nfs_client;
1340 /* Initialise the client representation from the parent server */
1341 nfs_server_copy_userdata(server, parent_server);
1342 server->caps |= NFS_CAP_ATOMIC_OPEN;
1344 /* Get a client representation.
1345 * Note: NFSv4 always uses TCP, */
1346 error = nfs4_set_client(server, data->hostname,
1349 parent_client->cl_ipaddr,
1351 parent_server->client->cl_xprt->prot,
1352 parent_server->client->cl_timeout,
1353 parent_client->cl_minorversion);
1357 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1361 BUG_ON(!server->nfs_client);
1362 BUG_ON(!server->nfs_client->rpc_ops);
1363 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1365 /* Probe the root fh to retrieve its FSID and filehandle */
1366 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1370 /* probe the filesystem info for this server filesystem */
1371 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1375 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1376 server->namelen = NFS4_MAXNAMLEN;
1378 dprintk("Referral FSID: %llx:%llx\n",
1379 (unsigned long long) server->fsid.major,
1380 (unsigned long long) server->fsid.minor);
1382 spin_lock(&nfs_client_lock);
1383 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1384 list_add_tail(&server->master_link, &nfs_volume_list);
1385 spin_unlock(&nfs_client_lock);
1387 server->mount_time = jiffies;
1389 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1393 nfs_free_server(server);
1394 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1395 return ERR_PTR(error);
1398 #endif /* CONFIG_NFS_V4 */
1401 * Clone an NFS2, NFS3 or NFS4 server record
1403 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1405 struct nfs_fattr *fattr)
1407 struct nfs_server *server;
1408 struct nfs_fattr fattr_fsinfo;
1411 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1412 (unsigned long long) fattr->fsid.major,
1413 (unsigned long long) fattr->fsid.minor);
1415 server = nfs_alloc_server();
1417 return ERR_PTR(-ENOMEM);
1419 /* Copy data from the source */
1420 server->nfs_client = source->nfs_client;
1421 atomic_inc(&server->nfs_client->cl_count);
1422 nfs_server_copy_userdata(server, source);
1424 server->fsid = fattr->fsid;
1426 error = nfs_init_server_rpcclient(server,
1427 source->client->cl_timeout,
1428 source->client->cl_auth->au_flavor);
1430 goto out_free_server;
1431 if (!IS_ERR(source->client_acl))
1432 nfs_init_server_aclclient(server);
1434 /* probe the filesystem info for this server filesystem */
1435 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1437 goto out_free_server;
1439 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1440 server->namelen = NFS4_MAXNAMLEN;
1442 dprintk("Cloned FSID: %llx:%llx\n",
1443 (unsigned long long) server->fsid.major,
1444 (unsigned long long) server->fsid.minor);
1446 error = nfs_start_lockd(server);
1448 goto out_free_server;
1450 spin_lock(&nfs_client_lock);
1451 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1452 list_add_tail(&server->master_link, &nfs_volume_list);
1453 spin_unlock(&nfs_client_lock);
1455 server->mount_time = jiffies;
1457 dprintk("<-- nfs_clone_server() = %p\n", server);
1461 nfs_free_server(server);
1462 dprintk("<-- nfs_clone_server() = error %d\n", error);
1463 return ERR_PTR(error);
1466 #ifdef CONFIG_PROC_FS
1467 static struct proc_dir_entry *proc_fs_nfs;
1469 static int nfs_server_list_open(struct inode *inode, struct file *file);
1470 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1471 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1472 static void nfs_server_list_stop(struct seq_file *p, void *v);
1473 static int nfs_server_list_show(struct seq_file *m, void *v);
1475 static struct seq_operations nfs_server_list_ops = {
1476 .start = nfs_server_list_start,
1477 .next = nfs_server_list_next,
1478 .stop = nfs_server_list_stop,
1479 .show = nfs_server_list_show,
1482 static const struct file_operations nfs_server_list_fops = {
1483 .open = nfs_server_list_open,
1485 .llseek = seq_lseek,
1486 .release = seq_release,
1487 .owner = THIS_MODULE,
1490 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1491 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1492 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1493 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1494 static int nfs_volume_list_show(struct seq_file *m, void *v);
1496 static struct seq_operations nfs_volume_list_ops = {
1497 .start = nfs_volume_list_start,
1498 .next = nfs_volume_list_next,
1499 .stop = nfs_volume_list_stop,
1500 .show = nfs_volume_list_show,
1503 static const struct file_operations nfs_volume_list_fops = {
1504 .open = nfs_volume_list_open,
1506 .llseek = seq_lseek,
1507 .release = seq_release,
1508 .owner = THIS_MODULE,
1512 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1515 static int nfs_server_list_open(struct inode *inode, struct file *file)
1520 ret = seq_open(file, &nfs_server_list_ops);
1524 m = file->private_data;
1525 m->private = PDE(inode)->data;
1531 * set up the iterator to start reading from the server list and return the first item
1533 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1535 /* lock the list against modification */
1536 spin_lock(&nfs_client_lock);
1537 return seq_list_start_head(&nfs_client_list, *_pos);
1541 * move to next server
1543 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1545 return seq_list_next(v, &nfs_client_list, pos);
1549 * clean up after reading from the transports list
1551 static void nfs_server_list_stop(struct seq_file *p, void *v)
1553 spin_unlock(&nfs_client_lock);
1557 * display a header line followed by a load of call lines
1559 static int nfs_server_list_show(struct seq_file *m, void *v)
1561 struct nfs_client *clp;
1563 /* display header on line 1 */
1564 if (v == &nfs_client_list) {
1565 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1569 /* display one transport per line on subsequent lines */
1570 clp = list_entry(v, struct nfs_client, cl_share_link);
1572 seq_printf(m, "v%u %s %s %3d %s\n",
1573 clp->rpc_ops->version,
1574 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1575 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1576 atomic_read(&clp->cl_count),
1583 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1585 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1590 ret = seq_open(file, &nfs_volume_list_ops);
1594 m = file->private_data;
1595 m->private = PDE(inode)->data;
1601 * set up the iterator to start reading from the volume list and return the first item
1603 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1605 /* lock the list against modification */
1606 spin_lock(&nfs_client_lock);
1607 return seq_list_start_head(&nfs_volume_list, *_pos);
1611 * move to next volume
1613 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1615 return seq_list_next(v, &nfs_volume_list, pos);
1619 * clean up after reading from the transports list
1621 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1623 spin_unlock(&nfs_client_lock);
1627 * display a header line followed by a load of call lines
1629 static int nfs_volume_list_show(struct seq_file *m, void *v)
1631 struct nfs_server *server;
1632 struct nfs_client *clp;
1633 char dev[8], fsid[17];
1635 /* display header on line 1 */
1636 if (v == &nfs_volume_list) {
1637 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
1640 /* display one transport per line on subsequent lines */
1641 server = list_entry(v, struct nfs_server, master_link);
1642 clp = server->nfs_client;
1644 snprintf(dev, 8, "%u:%u",
1645 MAJOR(server->s_dev), MINOR(server->s_dev));
1647 snprintf(fsid, 17, "%llx:%llx",
1648 (unsigned long long) server->fsid.major,
1649 (unsigned long long) server->fsid.minor);
1651 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1652 clp->rpc_ops->version,
1653 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1654 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1657 nfs_server_fscache_state(server));
1663 * initialise the /proc/fs/nfsfs/ directory
1665 int __init nfs_fs_proc_init(void)
1667 struct proc_dir_entry *p;
1669 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1673 /* a file of servers with which we're dealing */
1674 p = proc_create("servers", S_IFREG|S_IRUGO,
1675 proc_fs_nfs, &nfs_server_list_fops);
1679 /* a file of volumes that we have mounted */
1680 p = proc_create("volumes", S_IFREG|S_IRUGO,
1681 proc_fs_nfs, &nfs_volume_list_fops);
1687 remove_proc_entry("servers", proc_fs_nfs);
1689 remove_proc_entry("fs/nfsfs", NULL);
1695 * clean up the /proc/fs/nfsfs/ directory
1697 void nfs_fs_proc_exit(void)
1699 remove_proc_entry("volumes", proc_fs_nfs);
1700 remove_proc_entry("servers", proc_fs_nfs);
1701 remove_proc_entry("fs/nfsfs", NULL);
1704 #endif /* CONFIG_PROC_FS */