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 atomic_set(&clp->cl_count, 1);
125 clp->cl_cons_state = NFS_CS_INITING;
127 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
128 clp->cl_addrlen = cl_init->addrlen;
130 if (cl_init->hostname) {
131 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
132 if (!clp->cl_hostname)
136 INIT_LIST_HEAD(&clp->cl_superblocks);
137 clp->cl_rpcclient = ERR_PTR(-EINVAL);
139 clp->cl_proto = cl_init->proto;
142 INIT_LIST_HEAD(&clp->cl_delegations);
143 spin_lock_init(&clp->cl_lock);
144 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
145 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
146 clp->cl_boot_time = CURRENT_TIME;
147 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
148 clp->cl_minorversion = cl_init->minorversion;
150 cred = rpc_lookup_machine_cred();
152 clp->cl_machine_cred = cred;
154 nfs_fscache_get_client_cookie(clp);
164 static void nfs4_shutdown_client(struct nfs_client *clp)
167 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
168 nfs4_kill_renewd(clp);
169 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
170 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
171 nfs_idmap_delete(clp);
173 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
178 * Destroy the NFS4 callback service
180 static void nfs4_destroy_callback(struct nfs_client *clp)
183 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
185 #endif /* CONFIG_NFS_V4 */
189 * Clears/puts all minor version specific parts from an nfs_client struct
190 * reverting it to minorversion 0.
192 static void nfs4_clear_client_minor_version(struct nfs_client *clp)
194 #ifdef CONFIG_NFS_V4_1
195 if (nfs4_has_session(clp)) {
196 nfs4_destroy_session(clp->cl_session);
197 clp->cl_session = NULL;
200 clp->cl_call_sync = _nfs4_call_sync;
201 #endif /* CONFIG_NFS_V4_1 */
203 nfs4_destroy_callback(clp);
207 * Destroy a shared client record
209 static void nfs_free_client(struct nfs_client *clp)
211 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
213 nfs4_clear_client_minor_version(clp);
214 nfs4_shutdown_client(clp);
216 nfs_fscache_release_client_cookie(clp);
218 /* -EIO all pending I/O */
219 if (!IS_ERR(clp->cl_rpcclient))
220 rpc_shutdown_client(clp->cl_rpcclient);
222 if (clp->cl_machine_cred != NULL)
223 put_rpccred(clp->cl_machine_cred);
225 kfree(clp->cl_hostname);
228 dprintk("<-- nfs_free_client()\n");
232 * Release a reference to a shared client record
234 void nfs_put_client(struct nfs_client *clp)
239 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
241 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
242 list_del(&clp->cl_share_link);
243 spin_unlock(&nfs_client_lock);
245 BUG_ON(!list_empty(&clp->cl_superblocks));
247 nfs_free_client(clp);
251 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
253 * Test if two ip6 socket addresses refer to the same socket by
254 * comparing relevant fields. The padding bytes specifically, are not
255 * compared. sin6_flowinfo is not compared because it only affects QoS
256 * and sin6_scope_id is only compared if the address is "link local"
257 * because "link local" addresses need only be unique to a specific
258 * link. Conversely, ordinary unicast addresses might have different
261 * The caller should ensure both socket addresses are AF_INET6.
263 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
264 const struct sockaddr *sa2)
266 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
267 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
269 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
270 sin1->sin6_scope_id != sin2->sin6_scope_id)
273 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
275 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
276 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
277 const struct sockaddr *sa2)
284 * Test if two ip4 socket addresses refer to the same socket, by
285 * comparing relevant fields. The padding bytes specifically, are
288 * The caller should ensure both socket addresses are AF_INET.
290 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
291 const struct sockaddr *sa2)
293 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
294 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
296 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
299 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
300 const struct sockaddr *sa2)
302 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
303 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
305 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
306 (sin1->sin6_port == sin2->sin6_port);
309 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
310 const struct sockaddr *sa2)
312 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
313 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
315 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
316 (sin1->sin_port == sin2->sin_port);
320 * Test if two socket addresses represent the same actual socket,
321 * by comparing (only) relevant fields, excluding the port number.
323 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
324 const struct sockaddr *sa2)
326 if (sa1->sa_family != sa2->sa_family)
329 switch (sa1->sa_family) {
331 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
333 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
339 * Test if two socket addresses represent the same actual socket,
340 * by comparing (only) relevant fields, including the port number.
342 static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
343 const struct sockaddr *sa2)
345 if (sa1->sa_family != sa2->sa_family)
348 switch (sa1->sa_family) {
350 return nfs_sockaddr_cmp_ip4(sa1, sa2);
352 return nfs_sockaddr_cmp_ip6(sa1, sa2);
358 * Find a client by IP address and protocol version
359 * - returns NULL if no such client
361 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
363 struct nfs_client *clp;
365 spin_lock(&nfs_client_lock);
366 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
367 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
369 /* Don't match clients that failed to initialise properly */
370 if (!(clp->cl_cons_state == NFS_CS_READY ||
371 clp->cl_cons_state == NFS_CS_SESSION_INITING))
374 /* Different NFS versions cannot share the same nfs_client */
375 if (clp->rpc_ops->version != nfsversion)
378 /* Match only the IP address, not the port number */
379 if (!nfs_sockaddr_match_ipaddr(addr, clap))
382 atomic_inc(&clp->cl_count);
383 spin_unlock(&nfs_client_lock);
386 spin_unlock(&nfs_client_lock);
391 * Find a client by IP address and protocol version
392 * - returns NULL if no such client
394 struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
396 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
397 u32 nfsvers = clp->rpc_ops->version;
399 spin_lock(&nfs_client_lock);
400 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
401 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
403 /* Don't match clients that failed to initialise properly */
404 if (clp->cl_cons_state != NFS_CS_READY)
407 /* Different NFS versions cannot share the same nfs_client */
408 if (clp->rpc_ops->version != nfsvers)
411 /* Match only the IP address, not the port number */
412 if (!nfs_sockaddr_match_ipaddr(sap, clap))
415 atomic_inc(&clp->cl_count);
416 spin_unlock(&nfs_client_lock);
419 spin_unlock(&nfs_client_lock);
424 * Find an nfs_client on the list that matches the initialisation data
427 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
429 struct nfs_client *clp;
430 const struct sockaddr *sap = data->addr;
432 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
433 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
434 /* Don't match clients that failed to initialise properly */
435 if (clp->cl_cons_state < 0)
438 /* Different NFS versions cannot share the same nfs_client */
439 if (clp->rpc_ops != data->rpc_ops)
442 if (clp->cl_proto != data->proto)
444 /* Match nfsv4 minorversion */
445 if (clp->cl_minorversion != data->minorversion)
447 /* Match the full socket address */
448 if (!nfs_sockaddr_cmp(sap, clap))
451 atomic_inc(&clp->cl_count);
458 * Look up a client by IP address and protocol version
459 * - creates a new record if one doesn't yet exist
461 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
463 struct nfs_client *clp, *new = NULL;
466 dprintk("--> nfs_get_client(%s,v%u)\n",
467 cl_init->hostname ?: "", cl_init->rpc_ops->version);
469 /* see if the client already exists */
471 spin_lock(&nfs_client_lock);
473 clp = nfs_match_client(cl_init);
479 spin_unlock(&nfs_client_lock);
481 new = nfs_alloc_client(cl_init);
484 return ERR_PTR(-ENOMEM);
486 /* install a new client and return with it unready */
489 list_add(&clp->cl_share_link, &nfs_client_list);
490 spin_unlock(&nfs_client_lock);
491 dprintk("--> nfs_get_client() = %p [new]\n", clp);
494 /* found an existing client
495 * - make sure it's ready before returning
498 spin_unlock(&nfs_client_lock);
501 nfs_free_client(new);
503 error = wait_event_killable(nfs_client_active_wq,
504 clp->cl_cons_state < NFS_CS_INITING);
507 return ERR_PTR(-ERESTARTSYS);
510 if (clp->cl_cons_state < NFS_CS_READY) {
511 error = clp->cl_cons_state;
513 return ERR_PTR(error);
516 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
518 dprintk("--> nfs_get_client() = %p [share]\n", clp);
523 * Mark a server as ready or failed
525 void nfs_mark_client_ready(struct nfs_client *clp, int state)
527 clp->cl_cons_state = state;
528 wake_up_all(&nfs_client_active_wq);
532 * With sessions, the client is not marked ready until after a
533 * successful EXCHANGE_ID and CREATE_SESSION.
535 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
536 * other versions of NFS can be tried.
538 int nfs4_check_client_ready(struct nfs_client *clp)
540 if (!nfs4_has_session(clp))
542 if (clp->cl_cons_state < NFS_CS_READY)
543 return -EPROTONOSUPPORT;
548 * Initialise the timeout values for a connection
550 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
551 unsigned int timeo, unsigned int retrans)
553 to->to_initval = timeo * HZ / 10;
554 to->to_retries = retrans;
557 case XPRT_TRANSPORT_TCP:
558 case XPRT_TRANSPORT_RDMA:
559 if (to->to_retries == 0)
560 to->to_retries = NFS_DEF_TCP_RETRANS;
561 if (to->to_initval == 0)
562 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
563 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
564 to->to_initval = NFS_MAX_TCP_TIMEOUT;
565 to->to_increment = to->to_initval;
566 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
567 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
568 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
569 if (to->to_maxval < to->to_initval)
570 to->to_maxval = to->to_initval;
571 to->to_exponential = 0;
573 case XPRT_TRANSPORT_UDP:
574 if (to->to_retries == 0)
575 to->to_retries = NFS_DEF_UDP_RETRANS;
577 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
578 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
579 to->to_initval = NFS_MAX_UDP_TIMEOUT;
580 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
581 to->to_exponential = 1;
589 * Create an RPC client handle
591 static int nfs_create_rpc_client(struct nfs_client *clp,
592 const struct rpc_timeout *timeparms,
593 rpc_authflavor_t flavor,
594 int discrtry, int noresvport)
596 struct rpc_clnt *clnt = NULL;
597 struct rpc_create_args args = {
598 .protocol = clp->cl_proto,
599 .address = (struct sockaddr *)&clp->cl_addr,
600 .addrsize = clp->cl_addrlen,
601 .timeout = timeparms,
602 .servername = clp->cl_hostname,
603 .program = &nfs_program,
604 .version = clp->rpc_ops->version,
605 .authflavor = flavor,
609 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
611 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
613 if (!IS_ERR(clp->cl_rpcclient))
616 clnt = rpc_create(&args);
618 dprintk("%s: cannot create RPC client. Error = %ld\n",
619 __func__, PTR_ERR(clnt));
620 return PTR_ERR(clnt);
623 clp->cl_rpcclient = clnt;
628 * Version 2 or 3 client destruction
630 static void nfs_destroy_server(struct nfs_server *server)
632 if (!(server->flags & NFS_MOUNT_NONLM))
633 nlmclnt_done(server->nlm_host);
637 * Version 2 or 3 lockd setup
639 static int nfs_start_lockd(struct nfs_server *server)
641 struct nlm_host *host;
642 struct nfs_client *clp = server->nfs_client;
643 struct nlmclnt_initdata nlm_init = {
644 .hostname = clp->cl_hostname,
645 .address = (struct sockaddr *)&clp->cl_addr,
646 .addrlen = clp->cl_addrlen,
647 .protocol = server->flags & NFS_MOUNT_TCP ?
648 IPPROTO_TCP : IPPROTO_UDP,
649 .nfs_version = clp->rpc_ops->version,
650 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
654 if (nlm_init.nfs_version > 3)
656 if (server->flags & NFS_MOUNT_NONLM)
659 host = nlmclnt_init(&nlm_init);
661 return PTR_ERR(host);
663 server->nlm_host = host;
664 server->destroy = nfs_destroy_server;
669 * Initialise an NFSv3 ACL client connection
671 #ifdef CONFIG_NFS_V3_ACL
672 static void nfs_init_server_aclclient(struct nfs_server *server)
674 if (server->nfs_client->rpc_ops->version != 3)
676 if (server->flags & NFS_MOUNT_NOACL)
679 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
680 if (IS_ERR(server->client_acl))
683 /* No errors! Assume that Sun nfsacls are supported */
684 server->caps |= NFS_CAP_ACLS;
688 server->caps &= ~NFS_CAP_ACLS;
691 static inline void nfs_init_server_aclclient(struct nfs_server *server)
693 server->flags &= ~NFS_MOUNT_NOACL;
694 server->caps &= ~NFS_CAP_ACLS;
699 * Create a general RPC client
701 static int nfs_init_server_rpcclient(struct nfs_server *server,
702 const struct rpc_timeout *timeo,
703 rpc_authflavor_t pseudoflavour)
705 struct nfs_client *clp = server->nfs_client;
707 server->client = rpc_clone_client(clp->cl_rpcclient);
708 if (IS_ERR(server->client)) {
709 dprintk("%s: couldn't create rpc_client!\n", __func__);
710 return PTR_ERR(server->client);
713 memcpy(&server->client->cl_timeout_default,
715 sizeof(server->client->cl_timeout_default));
716 server->client->cl_timeout = &server->client->cl_timeout_default;
718 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
719 struct rpc_auth *auth;
721 auth = rpcauth_create(pseudoflavour, server->client);
723 dprintk("%s: couldn't create credcache!\n", __func__);
724 return PTR_ERR(auth);
727 server->client->cl_softrtry = 0;
728 if (server->flags & NFS_MOUNT_SOFT)
729 server->client->cl_softrtry = 1;
735 * Initialise an NFS2 or NFS3 client
737 static int nfs_init_client(struct nfs_client *clp,
738 const struct rpc_timeout *timeparms,
739 const struct nfs_parsed_mount_data *data)
743 if (clp->cl_cons_state == NFS_CS_READY) {
744 /* the client is already initialised */
745 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
750 * Create a client RPC handle for doing FSSTAT with UNIX auth only
751 * - RFC 2623, sec 2.3.2
753 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
754 0, data->flags & NFS_MOUNT_NORESVPORT);
757 nfs_mark_client_ready(clp, NFS_CS_READY);
761 nfs_mark_client_ready(clp, error);
762 dprintk("<-- nfs_init_client() = xerror %d\n", error);
767 * Create a version 2 or 3 client
769 static int nfs_init_server(struct nfs_server *server,
770 const struct nfs_parsed_mount_data *data)
772 struct nfs_client_initdata cl_init = {
773 .hostname = data->nfs_server.hostname,
774 .addr = (const struct sockaddr *)&data->nfs_server.address,
775 .addrlen = data->nfs_server.addrlen,
776 .rpc_ops = &nfs_v2_clientops,
777 .proto = data->nfs_server.protocol,
779 struct rpc_timeout timeparms;
780 struct nfs_client *clp;
783 dprintk("--> nfs_init_server()\n");
786 if (data->flags & NFS_MOUNT_VER3)
787 cl_init.rpc_ops = &nfs_v3_clientops;
790 /* Allocate or find a client reference we can use */
791 clp = nfs_get_client(&cl_init);
793 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
797 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
798 data->timeo, data->retrans);
799 error = nfs_init_client(clp, &timeparms, data);
803 server->nfs_client = clp;
805 /* Initialise the client representation from the mount data */
806 server->flags = data->flags;
807 server->options = data->options;
810 server->rsize = nfs_block_size(data->rsize, NULL);
812 server->wsize = nfs_block_size(data->wsize, NULL);
814 server->acregmin = data->acregmin * HZ;
815 server->acregmax = data->acregmax * HZ;
816 server->acdirmin = data->acdirmin * HZ;
817 server->acdirmax = data->acdirmax * HZ;
819 /* Start lockd here, before we might error out */
820 error = nfs_start_lockd(server);
824 server->port = data->nfs_server.port;
826 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
830 /* Preserve the values of mount_server-related mount options */
831 if (data->mount_server.addrlen) {
832 memcpy(&server->mountd_address, &data->mount_server.address,
833 data->mount_server.addrlen);
834 server->mountd_addrlen = data->mount_server.addrlen;
836 server->mountd_version = data->mount_server.version;
837 server->mountd_port = data->mount_server.port;
838 server->mountd_protocol = data->mount_server.protocol;
840 server->namelen = data->namlen;
841 /* Create a client RPC handle for the NFSv3 ACL management interface */
842 nfs_init_server_aclclient(server);
843 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
847 server->nfs_client = NULL;
849 dprintk("<-- nfs_init_server() = xerror %d\n", error);
854 * Load up the server record from information gained in an fsinfo record
856 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
858 unsigned long max_rpc_payload;
860 /* Work out a lot of parameters */
861 if (server->rsize == 0)
862 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
863 if (server->wsize == 0)
864 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
866 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
867 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
868 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
869 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
871 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
872 if (server->rsize > max_rpc_payload)
873 server->rsize = max_rpc_payload;
874 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
875 server->rsize = NFS_MAX_FILE_IO_SIZE;
876 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
878 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
880 if (server->wsize > max_rpc_payload)
881 server->wsize = max_rpc_payload;
882 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
883 server->wsize = NFS_MAX_FILE_IO_SIZE;
884 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
885 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
887 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
888 if (server->dtsize > PAGE_CACHE_SIZE)
889 server->dtsize = PAGE_CACHE_SIZE;
890 if (server->dtsize > server->rsize)
891 server->dtsize = server->rsize;
893 if (server->flags & NFS_MOUNT_NOAC) {
894 server->acregmin = server->acregmax = 0;
895 server->acdirmin = server->acdirmax = 0;
898 server->maxfilesize = fsinfo->maxfilesize;
900 /* We're airborne Set socket buffersize */
901 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
905 * Probe filesystem information, including the FSID on v2/v3
907 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
909 struct nfs_fsinfo fsinfo;
910 struct nfs_client *clp = server->nfs_client;
913 dprintk("--> nfs_probe_fsinfo()\n");
915 if (clp->rpc_ops->set_capabilities != NULL) {
916 error = clp->rpc_ops->set_capabilities(server, mntfh);
921 fsinfo.fattr = fattr;
922 nfs_fattr_init(fattr);
923 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
927 nfs_server_set_fsinfo(server, &fsinfo);
928 error = bdi_init(&server->backing_dev_info);
933 /* Get some general file system info */
934 if (server->namelen == 0) {
935 struct nfs_pathconf pathinfo;
937 pathinfo.fattr = fattr;
938 nfs_fattr_init(fattr);
940 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
941 server->namelen = pathinfo.max_namelen;
944 dprintk("<-- nfs_probe_fsinfo() = 0\n");
948 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
953 * Copy useful information when duplicating a server record
955 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
957 target->flags = source->flags;
958 target->acregmin = source->acregmin;
959 target->acregmax = source->acregmax;
960 target->acdirmin = source->acdirmin;
961 target->acdirmax = source->acdirmax;
962 target->caps = source->caps;
966 * Allocate and initialise a server record
968 static struct nfs_server *nfs_alloc_server(void)
970 struct nfs_server *server;
972 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
976 server->client = server->client_acl = ERR_PTR(-EINVAL);
978 /* Zero out the NFS state stuff */
979 INIT_LIST_HEAD(&server->client_link);
980 INIT_LIST_HEAD(&server->master_link);
982 atomic_set(&server->active, 0);
984 server->io_stats = nfs_alloc_iostats();
985 if (!server->io_stats) {
994 * Free up a server record
996 void nfs_free_server(struct nfs_server *server)
998 dprintk("--> nfs_free_server()\n");
1000 spin_lock(&nfs_client_lock);
1001 list_del(&server->client_link);
1002 list_del(&server->master_link);
1003 spin_unlock(&nfs_client_lock);
1005 if (server->destroy != NULL)
1006 server->destroy(server);
1008 if (!IS_ERR(server->client_acl))
1009 rpc_shutdown_client(server->client_acl);
1010 if (!IS_ERR(server->client))
1011 rpc_shutdown_client(server->client);
1013 nfs_put_client(server->nfs_client);
1015 nfs_free_iostats(server->io_stats);
1016 bdi_destroy(&server->backing_dev_info);
1018 nfs_release_automount_timer();
1019 dprintk("<-- nfs_free_server()\n");
1023 * Create a version 2 or 3 volume record
1024 * - keyed on server and FSID
1026 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1027 struct nfs_fh *mntfh)
1029 struct nfs_server *server;
1030 struct nfs_fattr fattr;
1033 server = nfs_alloc_server();
1035 return ERR_PTR(-ENOMEM);
1037 /* Get a client representation */
1038 error = nfs_init_server(server, data);
1042 BUG_ON(!server->nfs_client);
1043 BUG_ON(!server->nfs_client->rpc_ops);
1044 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1046 /* Probe the root fh to retrieve its FSID */
1047 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1050 if (server->nfs_client->rpc_ops->version == 3) {
1051 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1052 server->namelen = NFS3_MAXNAMLEN;
1053 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1054 server->caps |= NFS_CAP_READDIRPLUS;
1056 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1057 server->namelen = NFS2_MAXNAMLEN;
1060 if (!(fattr.valid & NFS_ATTR_FATTR)) {
1061 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
1063 dprintk("nfs_create_server: getattr error = %d\n", -error);
1067 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
1069 dprintk("Server FSID: %llx:%llx\n",
1070 (unsigned long long) server->fsid.major,
1071 (unsigned long long) server->fsid.minor);
1073 BUG_ON(!server->nfs_client);
1074 BUG_ON(!server->nfs_client->rpc_ops);
1075 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1077 spin_lock(&nfs_client_lock);
1078 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1079 list_add_tail(&server->master_link, &nfs_volume_list);
1080 spin_unlock(&nfs_client_lock);
1082 server->mount_time = jiffies;
1086 nfs_free_server(server);
1087 return ERR_PTR(error);
1090 #ifdef CONFIG_NFS_V4
1092 * Initialize the NFS4 callback service
1094 static int nfs4_init_callback(struct nfs_client *clp)
1098 if (clp->rpc_ops->version == 4) {
1099 error = nfs_callback_up(clp->cl_minorversion,
1100 clp->cl_rpcclient->cl_xprt);
1102 dprintk("%s: failed to start callback. Error = %d\n",
1106 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
1112 * Initialize the minor version specific parts of an NFS4 client record
1114 static int nfs4_init_client_minor_version(struct nfs_client *clp)
1116 clp->cl_call_sync = _nfs4_call_sync;
1118 #if defined(CONFIG_NFS_V4_1)
1119 if (clp->cl_minorversion) {
1120 struct nfs4_session *session = NULL;
1122 * Create the session and mark it expired.
1123 * When a SEQUENCE operation encounters the expired session
1124 * it will do session recovery to initialize it.
1126 session = nfs4_alloc_session(clp);
1130 clp->cl_session = session;
1131 clp->cl_call_sync = _nfs4_call_sync_session;
1133 #endif /* CONFIG_NFS_V4_1 */
1135 return nfs4_init_callback(clp);
1139 * Initialise an NFS4 client record
1141 static int nfs4_init_client(struct nfs_client *clp,
1142 const struct rpc_timeout *timeparms,
1143 const char *ip_addr,
1144 rpc_authflavor_t authflavour,
1149 if (clp->cl_cons_state == NFS_CS_READY) {
1150 /* the client is initialised already */
1151 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1155 /* Check NFS protocol revision and initialize RPC op vector */
1156 clp->rpc_ops = &nfs_v4_clientops;
1158 error = nfs_create_rpc_client(clp, timeparms, authflavour,
1159 1, flags & NFS_MOUNT_NORESVPORT);
1162 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1164 error = nfs_idmap_new(clp);
1166 dprintk("%s: failed to create idmapper. Error = %d\n",
1170 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1172 error = nfs4_init_client_minor_version(clp);
1176 if (!nfs4_has_session(clp))
1177 nfs_mark_client_ready(clp, NFS_CS_READY);
1181 nfs_mark_client_ready(clp, error);
1182 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1187 * Set up an NFS4 client
1189 static int nfs4_set_client(struct nfs_server *server,
1190 const char *hostname,
1191 const struct sockaddr *addr,
1192 const size_t addrlen,
1193 const char *ip_addr,
1194 rpc_authflavor_t authflavour,
1195 int proto, const struct rpc_timeout *timeparms,
1198 struct nfs_client_initdata cl_init = {
1199 .hostname = hostname,
1202 .rpc_ops = &nfs_v4_clientops,
1204 .minorversion = minorversion,
1206 struct nfs_client *clp;
1209 dprintk("--> nfs4_set_client()\n");
1211 /* Allocate or find a client reference we can use */
1212 clp = nfs_get_client(&cl_init);
1214 error = PTR_ERR(clp);
1217 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
1222 server->nfs_client = clp;
1223 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1227 nfs_put_client(clp);
1229 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1234 * Initialize a session.
1235 * Note: save the mount rsize and wsize for create_server negotiation.
1237 static void nfs4_init_session(struct nfs_client *clp,
1238 unsigned int wsize, unsigned int rsize)
1240 #if defined(CONFIG_NFS_V4_1)
1241 if (nfs4_has_session(clp)) {
1242 clp->cl_session->fc_attrs.max_rqst_sz = wsize;
1243 clp->cl_session->fc_attrs.max_resp_sz = rsize;
1245 #endif /* CONFIG_NFS_V4_1 */
1249 * Session has been established, and the client marked ready.
1250 * Set the mount rsize and wsize with negotiated fore channel
1251 * attributes which will be bound checked in nfs_server_set_fsinfo.
1253 static void nfs4_session_set_rwsize(struct nfs_server *server)
1255 #ifdef CONFIG_NFS_V4_1
1256 if (!nfs4_has_session(server->nfs_client))
1258 server->rsize = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
1259 server->wsize = server->nfs_client->cl_session->fc_attrs.max_rqst_sz;
1260 #endif /* CONFIG_NFS_V4_1 */
1264 * Create a version 4 volume record
1266 static int nfs4_init_server(struct nfs_server *server,
1267 const struct nfs_parsed_mount_data *data)
1269 struct rpc_timeout timeparms;
1272 dprintk("--> nfs4_init_server()\n");
1274 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1275 data->timeo, data->retrans);
1277 /* Initialise the client representation from the mount data */
1278 server->flags = data->flags;
1279 server->caps |= NFS_CAP_ATOMIC_OPEN;
1280 server->options = data->options;
1282 /* Get a client record */
1283 error = nfs4_set_client(server,
1284 data->nfs_server.hostname,
1285 (const struct sockaddr *)&data->nfs_server.address,
1286 data->nfs_server.addrlen,
1287 data->client_address,
1288 data->auth_flavors[0],
1289 data->nfs_server.protocol,
1291 data->minorversion);
1296 server->rsize = nfs_block_size(data->rsize, NULL);
1298 server->wsize = nfs_block_size(data->wsize, NULL);
1300 server->acregmin = data->acregmin * HZ;
1301 server->acregmax = data->acregmax * HZ;
1302 server->acdirmin = data->acdirmin * HZ;
1303 server->acdirmax = data->acdirmax * HZ;
1305 server->port = data->nfs_server.port;
1307 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1311 dprintk("<-- nfs4_init_server() = %d\n", error);
1316 * Create a version 4 volume record
1317 * - keyed on server and FSID
1319 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1320 struct nfs_fh *mntfh)
1322 struct nfs_fattr fattr;
1323 struct nfs_server *server;
1326 dprintk("--> nfs4_create_server()\n");
1328 server = nfs_alloc_server();
1330 return ERR_PTR(-ENOMEM);
1332 /* set up the general RPC client */
1333 error = nfs4_init_server(server, data);
1337 BUG_ON(!server->nfs_client);
1338 BUG_ON(!server->nfs_client->rpc_ops);
1339 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1341 nfs4_init_session(server->nfs_client, server->wsize, server->rsize);
1343 /* Probe the root fh to retrieve its FSID */
1344 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1348 dprintk("Server FSID: %llx:%llx\n",
1349 (unsigned long long) server->fsid.major,
1350 (unsigned long long) server->fsid.minor);
1351 dprintk("Mount FH: %d\n", mntfh->size);
1353 nfs4_session_set_rwsize(server);
1355 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1359 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1360 server->namelen = NFS4_MAXNAMLEN;
1362 BUG_ON(!server->nfs_client);
1363 BUG_ON(!server->nfs_client->rpc_ops);
1364 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1366 spin_lock(&nfs_client_lock);
1367 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1368 list_add_tail(&server->master_link, &nfs_volume_list);
1369 spin_unlock(&nfs_client_lock);
1371 server->mount_time = jiffies;
1372 dprintk("<-- nfs4_create_server() = %p\n", server);
1376 nfs_free_server(server);
1377 dprintk("<-- nfs4_create_server() = error %d\n", error);
1378 return ERR_PTR(error);
1382 * Create an NFS4 referral server record
1384 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1385 struct nfs_fh *mntfh)
1387 struct nfs_client *parent_client;
1388 struct nfs_server *server, *parent_server;
1389 struct nfs_fattr fattr;
1392 dprintk("--> nfs4_create_referral_server()\n");
1394 server = nfs_alloc_server();
1396 return ERR_PTR(-ENOMEM);
1398 parent_server = NFS_SB(data->sb);
1399 parent_client = parent_server->nfs_client;
1401 /* Initialise the client representation from the parent server */
1402 nfs_server_copy_userdata(server, parent_server);
1403 server->caps |= NFS_CAP_ATOMIC_OPEN;
1405 /* Get a client representation.
1406 * Note: NFSv4 always uses TCP, */
1407 error = nfs4_set_client(server, data->hostname,
1410 parent_client->cl_ipaddr,
1412 parent_server->client->cl_xprt->prot,
1413 parent_server->client->cl_timeout,
1414 parent_client->cl_minorversion);
1418 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1422 BUG_ON(!server->nfs_client);
1423 BUG_ON(!server->nfs_client->rpc_ops);
1424 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1426 /* Probe the root fh to retrieve its FSID and filehandle */
1427 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1431 /* probe the filesystem info for this server filesystem */
1432 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1436 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1437 server->namelen = NFS4_MAXNAMLEN;
1439 dprintk("Referral FSID: %llx:%llx\n",
1440 (unsigned long long) server->fsid.major,
1441 (unsigned long long) server->fsid.minor);
1443 spin_lock(&nfs_client_lock);
1444 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1445 list_add_tail(&server->master_link, &nfs_volume_list);
1446 spin_unlock(&nfs_client_lock);
1448 server->mount_time = jiffies;
1450 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1454 nfs_free_server(server);
1455 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1456 return ERR_PTR(error);
1459 #endif /* CONFIG_NFS_V4 */
1462 * Clone an NFS2, NFS3 or NFS4 server record
1464 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1466 struct nfs_fattr *fattr)
1468 struct nfs_server *server;
1469 struct nfs_fattr fattr_fsinfo;
1472 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1473 (unsigned long long) fattr->fsid.major,
1474 (unsigned long long) fattr->fsid.minor);
1476 server = nfs_alloc_server();
1478 return ERR_PTR(-ENOMEM);
1480 /* Copy data from the source */
1481 server->nfs_client = source->nfs_client;
1482 atomic_inc(&server->nfs_client->cl_count);
1483 nfs_server_copy_userdata(server, source);
1485 server->fsid = fattr->fsid;
1487 error = nfs_init_server_rpcclient(server,
1488 source->client->cl_timeout,
1489 source->client->cl_auth->au_flavor);
1491 goto out_free_server;
1492 if (!IS_ERR(source->client_acl))
1493 nfs_init_server_aclclient(server);
1495 /* probe the filesystem info for this server filesystem */
1496 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1498 goto out_free_server;
1500 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1501 server->namelen = NFS4_MAXNAMLEN;
1503 dprintk("Cloned FSID: %llx:%llx\n",
1504 (unsigned long long) server->fsid.major,
1505 (unsigned long long) server->fsid.minor);
1507 error = nfs_start_lockd(server);
1509 goto out_free_server;
1511 spin_lock(&nfs_client_lock);
1512 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1513 list_add_tail(&server->master_link, &nfs_volume_list);
1514 spin_unlock(&nfs_client_lock);
1516 server->mount_time = jiffies;
1518 dprintk("<-- nfs_clone_server() = %p\n", server);
1522 nfs_free_server(server);
1523 dprintk("<-- nfs_clone_server() = error %d\n", error);
1524 return ERR_PTR(error);
1527 #ifdef CONFIG_PROC_FS
1528 static struct proc_dir_entry *proc_fs_nfs;
1530 static int nfs_server_list_open(struct inode *inode, struct file *file);
1531 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1532 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1533 static void nfs_server_list_stop(struct seq_file *p, void *v);
1534 static int nfs_server_list_show(struct seq_file *m, void *v);
1536 static struct seq_operations nfs_server_list_ops = {
1537 .start = nfs_server_list_start,
1538 .next = nfs_server_list_next,
1539 .stop = nfs_server_list_stop,
1540 .show = nfs_server_list_show,
1543 static const struct file_operations nfs_server_list_fops = {
1544 .open = nfs_server_list_open,
1546 .llseek = seq_lseek,
1547 .release = seq_release,
1548 .owner = THIS_MODULE,
1551 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1552 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1553 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1554 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1555 static int nfs_volume_list_show(struct seq_file *m, void *v);
1557 static struct seq_operations nfs_volume_list_ops = {
1558 .start = nfs_volume_list_start,
1559 .next = nfs_volume_list_next,
1560 .stop = nfs_volume_list_stop,
1561 .show = nfs_volume_list_show,
1564 static const struct file_operations nfs_volume_list_fops = {
1565 .open = nfs_volume_list_open,
1567 .llseek = seq_lseek,
1568 .release = seq_release,
1569 .owner = THIS_MODULE,
1573 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1576 static int nfs_server_list_open(struct inode *inode, struct file *file)
1581 ret = seq_open(file, &nfs_server_list_ops);
1585 m = file->private_data;
1586 m->private = PDE(inode)->data;
1592 * set up the iterator to start reading from the server list and return the first item
1594 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1596 /* lock the list against modification */
1597 spin_lock(&nfs_client_lock);
1598 return seq_list_start_head(&nfs_client_list, *_pos);
1602 * move to next server
1604 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1606 return seq_list_next(v, &nfs_client_list, pos);
1610 * clean up after reading from the transports list
1612 static void nfs_server_list_stop(struct seq_file *p, void *v)
1614 spin_unlock(&nfs_client_lock);
1618 * display a header line followed by a load of call lines
1620 static int nfs_server_list_show(struct seq_file *m, void *v)
1622 struct nfs_client *clp;
1624 /* display header on line 1 */
1625 if (v == &nfs_client_list) {
1626 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1630 /* display one transport per line on subsequent lines */
1631 clp = list_entry(v, struct nfs_client, cl_share_link);
1633 seq_printf(m, "v%u %s %s %3d %s\n",
1634 clp->rpc_ops->version,
1635 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1636 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1637 atomic_read(&clp->cl_count),
1644 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1646 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1651 ret = seq_open(file, &nfs_volume_list_ops);
1655 m = file->private_data;
1656 m->private = PDE(inode)->data;
1662 * set up the iterator to start reading from the volume list and return the first item
1664 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1666 /* lock the list against modification */
1667 spin_lock(&nfs_client_lock);
1668 return seq_list_start_head(&nfs_volume_list, *_pos);
1672 * move to next volume
1674 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1676 return seq_list_next(v, &nfs_volume_list, pos);
1680 * clean up after reading from the transports list
1682 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1684 spin_unlock(&nfs_client_lock);
1688 * display a header line followed by a load of call lines
1690 static int nfs_volume_list_show(struct seq_file *m, void *v)
1692 struct nfs_server *server;
1693 struct nfs_client *clp;
1694 char dev[8], fsid[17];
1696 /* display header on line 1 */
1697 if (v == &nfs_volume_list) {
1698 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
1701 /* display one transport per line on subsequent lines */
1702 server = list_entry(v, struct nfs_server, master_link);
1703 clp = server->nfs_client;
1705 snprintf(dev, 8, "%u:%u",
1706 MAJOR(server->s_dev), MINOR(server->s_dev));
1708 snprintf(fsid, 17, "%llx:%llx",
1709 (unsigned long long) server->fsid.major,
1710 (unsigned long long) server->fsid.minor);
1712 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1713 clp->rpc_ops->version,
1714 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1715 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1718 nfs_server_fscache_state(server));
1724 * initialise the /proc/fs/nfsfs/ directory
1726 int __init nfs_fs_proc_init(void)
1728 struct proc_dir_entry *p;
1730 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1734 /* a file of servers with which we're dealing */
1735 p = proc_create("servers", S_IFREG|S_IRUGO,
1736 proc_fs_nfs, &nfs_server_list_fops);
1740 /* a file of volumes that we have mounted */
1741 p = proc_create("volumes", S_IFREG|S_IRUGO,
1742 proc_fs_nfs, &nfs_volume_list_fops);
1748 remove_proc_entry("servers", proc_fs_nfs);
1750 remove_proc_entry("fs/nfsfs", NULL);
1756 * clean up the /proc/fs/nfsfs/ directory
1758 void nfs_fs_proc_exit(void)
1760 remove_proc_entry("volumes", proc_fs_nfs);
1761 remove_proc_entry("servers", proc_fs_nfs);
1762 remove_proc_entry("fs/nfsfs", NULL);
1765 #endif /* CONFIG_PROC_FS */