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>
40 #include <linux/sunrpc/bc_xprt.h>
42 #include <asm/system.h>
46 #include "delegation.h"
51 #define NFSDBG_FACILITY NFSDBG_CLIENT
53 static DEFINE_SPINLOCK(nfs_client_lock);
54 static LIST_HEAD(nfs_client_list);
55 static LIST_HEAD(nfs_volume_list);
56 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
61 static struct rpc_version *nfs_version[5] = {
71 struct rpc_program nfs_program = {
73 .number = NFS_PROGRAM,
74 .nrvers = ARRAY_SIZE(nfs_version),
75 .version = nfs_version,
76 .stats = &nfs_rpcstat,
77 .pipe_dir_name = "/nfs",
80 struct rpc_stat nfs_rpcstat = {
81 .program = &nfs_program
85 #ifdef CONFIG_NFS_V3_ACL
86 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
87 static struct rpc_version * nfsacl_version[] = {
88 [3] = &nfsacl_version3,
91 struct rpc_program nfsacl_program = {
93 .number = NFS_ACL_PROGRAM,
94 .nrvers = ARRAY_SIZE(nfsacl_version),
95 .version = nfsacl_version,
96 .stats = &nfsacl_rpcstat,
98 #endif /* CONFIG_NFS_V3_ACL */
100 struct nfs_client_initdata {
101 const char *hostname;
102 const struct sockaddr *addr;
104 const struct nfs_rpc_ops *rpc_ops;
110 * Allocate a shared client record
112 * Since these are allocated/deallocated very rarely, we don't
113 * bother putting them in a slab cache...
115 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
117 struct nfs_client *clp;
118 struct rpc_cred *cred;
121 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
124 clp->rpc_ops = cl_init->rpc_ops;
126 atomic_set(&clp->cl_count, 1);
127 clp->cl_cons_state = NFS_CS_INITING;
129 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
130 clp->cl_addrlen = cl_init->addrlen;
132 if (cl_init->hostname) {
134 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
135 if (!clp->cl_hostname)
139 INIT_LIST_HEAD(&clp->cl_superblocks);
140 clp->cl_rpcclient = ERR_PTR(-EINVAL);
142 clp->cl_proto = cl_init->proto;
145 INIT_LIST_HEAD(&clp->cl_delegations);
146 spin_lock_init(&clp->cl_lock);
147 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
148 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
149 clp->cl_boot_time = CURRENT_TIME;
150 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
151 clp->cl_minorversion = cl_init->minorversion;
153 cred = rpc_lookup_machine_cred();
155 clp->cl_machine_cred = cred;
157 nfs_fscache_get_client_cookie(clp);
167 static void nfs4_shutdown_client(struct nfs_client *clp)
170 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
171 nfs4_kill_renewd(clp);
172 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
173 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
174 nfs_idmap_delete(clp);
176 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
181 * Destroy the NFS4 callback service
183 static void nfs4_destroy_callback(struct nfs_client *clp)
186 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
187 nfs_callback_down(clp->cl_minorversion);
188 #endif /* CONFIG_NFS_V4 */
192 * Clears/puts all minor version specific parts from an nfs_client struct
193 * reverting it to minorversion 0.
195 static void nfs4_clear_client_minor_version(struct nfs_client *clp)
197 #ifdef CONFIG_NFS_V4_1
198 if (nfs4_has_session(clp)) {
199 nfs4_destroy_session(clp->cl_session);
200 clp->cl_session = NULL;
203 clp->cl_call_sync = _nfs4_call_sync;
204 #endif /* CONFIG_NFS_V4_1 */
206 nfs4_destroy_callback(clp);
210 * Destroy a shared client record
212 static void nfs_free_client(struct nfs_client *clp)
214 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
216 nfs4_clear_client_minor_version(clp);
217 nfs4_shutdown_client(clp);
219 nfs_fscache_release_client_cookie(clp);
221 /* -EIO all pending I/O */
222 if (!IS_ERR(clp->cl_rpcclient))
223 rpc_shutdown_client(clp->cl_rpcclient);
225 if (clp->cl_machine_cred != NULL)
226 put_rpccred(clp->cl_machine_cred);
228 kfree(clp->cl_hostname);
231 dprintk("<-- nfs_free_client()\n");
235 * Release a reference to a shared client record
237 void nfs_put_client(struct nfs_client *clp)
242 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
244 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
245 list_del(&clp->cl_share_link);
246 spin_unlock(&nfs_client_lock);
248 BUG_ON(!list_empty(&clp->cl_superblocks));
250 nfs_free_client(clp);
254 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
256 * Test if two ip6 socket addresses refer to the same socket by
257 * comparing relevant fields. The padding bytes specifically, are not
258 * compared. sin6_flowinfo is not compared because it only affects QoS
259 * and sin6_scope_id is only compared if the address is "link local"
260 * because "link local" addresses need only be unique to a specific
261 * link. Conversely, ordinary unicast addresses might have different
264 * The caller should ensure both socket addresses are AF_INET6.
266 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
267 const struct sockaddr *sa2)
269 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
270 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
272 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
273 sin1->sin6_scope_id != sin2->sin6_scope_id)
276 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
278 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
279 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
280 const struct sockaddr *sa2)
287 * Test if two ip4 socket addresses refer to the same socket, by
288 * comparing relevant fields. The padding bytes specifically, are
291 * The caller should ensure both socket addresses are AF_INET.
293 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
294 const struct sockaddr *sa2)
296 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
297 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
299 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
302 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
303 const struct sockaddr *sa2)
305 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
306 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
308 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
309 (sin1->sin6_port == sin2->sin6_port);
312 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
313 const struct sockaddr *sa2)
315 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
316 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
318 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
319 (sin1->sin_port == sin2->sin_port);
323 * Test if two socket addresses represent the same actual socket,
324 * by comparing (only) relevant fields, excluding the port number.
326 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
327 const struct sockaddr *sa2)
329 if (sa1->sa_family != sa2->sa_family)
332 switch (sa1->sa_family) {
334 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
336 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
342 * Test if two socket addresses represent the same actual socket,
343 * by comparing (only) relevant fields, including the port number.
345 static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
346 const struct sockaddr *sa2)
348 if (sa1->sa_family != sa2->sa_family)
351 switch (sa1->sa_family) {
353 return nfs_sockaddr_cmp_ip4(sa1, sa2);
355 return nfs_sockaddr_cmp_ip6(sa1, sa2);
361 * Find a client by IP address and protocol version
362 * - returns NULL if no such client
364 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
366 struct nfs_client *clp;
368 spin_lock(&nfs_client_lock);
369 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
370 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
372 /* Don't match clients that failed to initialise properly */
373 if (!(clp->cl_cons_state == NFS_CS_READY ||
374 clp->cl_cons_state == NFS_CS_SESSION_INITING))
377 /* Different NFS versions cannot share the same nfs_client */
378 if (clp->rpc_ops->version != nfsversion)
381 /* Match only the IP address, not the port number */
382 if (!nfs_sockaddr_match_ipaddr(addr, clap))
385 atomic_inc(&clp->cl_count);
386 spin_unlock(&nfs_client_lock);
389 spin_unlock(&nfs_client_lock);
394 * Find a client by IP address and protocol version
395 * - returns NULL if no such client
397 struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
399 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
400 u32 nfsvers = clp->rpc_ops->version;
402 spin_lock(&nfs_client_lock);
403 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
404 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
406 /* Don't match clients that failed to initialise properly */
407 if (clp->cl_cons_state != NFS_CS_READY)
410 /* Different NFS versions cannot share the same nfs_client */
411 if (clp->rpc_ops->version != nfsvers)
414 /* Match only the IP address, not the port number */
415 if (!nfs_sockaddr_match_ipaddr(sap, clap))
418 atomic_inc(&clp->cl_count);
419 spin_unlock(&nfs_client_lock);
422 spin_unlock(&nfs_client_lock);
427 * Find an nfs_client on the list that matches the initialisation data
430 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
432 struct nfs_client *clp;
433 const struct sockaddr *sap = data->addr;
435 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
436 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
437 /* Don't match clients that failed to initialise properly */
438 if (clp->cl_cons_state < 0)
441 /* Different NFS versions cannot share the same nfs_client */
442 if (clp->rpc_ops != data->rpc_ops)
445 if (clp->cl_proto != data->proto)
447 /* Match nfsv4 minorversion */
448 if (clp->cl_minorversion != data->minorversion)
450 /* Match the full socket address */
451 if (!nfs_sockaddr_cmp(sap, clap))
454 atomic_inc(&clp->cl_count);
461 * Look up a client by IP address and protocol version
462 * - creates a new record if one doesn't yet exist
464 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
466 struct nfs_client *clp, *new = NULL;
469 dprintk("--> nfs_get_client(%s,v%u)\n",
470 cl_init->hostname ?: "", cl_init->rpc_ops->version);
472 /* see if the client already exists */
474 spin_lock(&nfs_client_lock);
476 clp = nfs_match_client(cl_init);
482 spin_unlock(&nfs_client_lock);
484 new = nfs_alloc_client(cl_init);
485 } while (!IS_ERR(new));
487 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
490 /* install a new client and return with it unready */
493 list_add(&clp->cl_share_link, &nfs_client_list);
494 spin_unlock(&nfs_client_lock);
495 dprintk("--> nfs_get_client() = %p [new]\n", clp);
498 /* found an existing client
499 * - make sure it's ready before returning
502 spin_unlock(&nfs_client_lock);
505 nfs_free_client(new);
507 error = wait_event_killable(nfs_client_active_wq,
508 clp->cl_cons_state < NFS_CS_INITING);
511 return ERR_PTR(-ERESTARTSYS);
514 if (clp->cl_cons_state < NFS_CS_READY) {
515 error = clp->cl_cons_state;
517 return ERR_PTR(error);
520 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
522 dprintk("--> nfs_get_client() = %p [share]\n", clp);
527 * Mark a server as ready or failed
529 void nfs_mark_client_ready(struct nfs_client *clp, int state)
531 clp->cl_cons_state = state;
532 wake_up_all(&nfs_client_active_wq);
536 * With sessions, the client is not marked ready until after a
537 * successful EXCHANGE_ID and CREATE_SESSION.
539 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
540 * other versions of NFS can be tried.
542 int nfs4_check_client_ready(struct nfs_client *clp)
544 if (!nfs4_has_session(clp))
546 if (clp->cl_cons_state < NFS_CS_READY)
547 return -EPROTONOSUPPORT;
552 * Initialise the timeout values for a connection
554 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
555 unsigned int timeo, unsigned int retrans)
557 to->to_initval = timeo * HZ / 10;
558 to->to_retries = retrans;
561 case XPRT_TRANSPORT_TCP:
562 case XPRT_TRANSPORT_RDMA:
563 if (to->to_retries == 0)
564 to->to_retries = NFS_DEF_TCP_RETRANS;
565 if (to->to_initval == 0)
566 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
567 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
568 to->to_initval = NFS_MAX_TCP_TIMEOUT;
569 to->to_increment = to->to_initval;
570 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
571 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
572 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
573 if (to->to_maxval < to->to_initval)
574 to->to_maxval = to->to_initval;
575 to->to_exponential = 0;
577 case XPRT_TRANSPORT_UDP:
578 if (to->to_retries == 0)
579 to->to_retries = NFS_DEF_UDP_RETRANS;
581 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
582 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
583 to->to_initval = NFS_MAX_UDP_TIMEOUT;
584 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
585 to->to_exponential = 1;
593 * Create an RPC client handle
595 static int nfs_create_rpc_client(struct nfs_client *clp,
596 const struct rpc_timeout *timeparms,
597 rpc_authflavor_t flavor,
598 int discrtry, int noresvport)
600 struct rpc_clnt *clnt = NULL;
601 struct rpc_create_args args = {
602 .protocol = clp->cl_proto,
603 .address = (struct sockaddr *)&clp->cl_addr,
604 .addrsize = clp->cl_addrlen,
605 .timeout = timeparms,
606 .servername = clp->cl_hostname,
607 .program = &nfs_program,
608 .version = clp->rpc_ops->version,
609 .authflavor = flavor,
613 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
615 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
617 if (!IS_ERR(clp->cl_rpcclient))
620 clnt = rpc_create(&args);
622 dprintk("%s: cannot create RPC client. Error = %ld\n",
623 __func__, PTR_ERR(clnt));
624 return PTR_ERR(clnt);
627 clp->cl_rpcclient = clnt;
632 * Version 2 or 3 client destruction
634 static void nfs_destroy_server(struct nfs_server *server)
636 if (!(server->flags & NFS_MOUNT_NONLM))
637 nlmclnt_done(server->nlm_host);
641 * Version 2 or 3 lockd setup
643 static int nfs_start_lockd(struct nfs_server *server)
645 struct nlm_host *host;
646 struct nfs_client *clp = server->nfs_client;
647 struct nlmclnt_initdata nlm_init = {
648 .hostname = clp->cl_hostname,
649 .address = (struct sockaddr *)&clp->cl_addr,
650 .addrlen = clp->cl_addrlen,
651 .nfs_version = clp->rpc_ops->version,
652 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
656 if (nlm_init.nfs_version > 3)
658 if (server->flags & NFS_MOUNT_NONLM)
661 switch (clp->cl_proto) {
663 nlm_init.protocol = IPPROTO_TCP;
665 case XPRT_TRANSPORT_UDP:
666 nlm_init.protocol = IPPROTO_UDP;
669 host = nlmclnt_init(&nlm_init);
671 return PTR_ERR(host);
673 server->nlm_host = host;
674 server->destroy = nfs_destroy_server;
679 * Initialise an NFSv3 ACL client connection
681 #ifdef CONFIG_NFS_V3_ACL
682 static void nfs_init_server_aclclient(struct nfs_server *server)
684 if (server->nfs_client->rpc_ops->version != 3)
686 if (server->flags & NFS_MOUNT_NOACL)
689 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
690 if (IS_ERR(server->client_acl))
693 /* No errors! Assume that Sun nfsacls are supported */
694 server->caps |= NFS_CAP_ACLS;
698 server->caps &= ~NFS_CAP_ACLS;
701 static inline void nfs_init_server_aclclient(struct nfs_server *server)
703 server->flags &= ~NFS_MOUNT_NOACL;
704 server->caps &= ~NFS_CAP_ACLS;
709 * Create a general RPC client
711 static int nfs_init_server_rpcclient(struct nfs_server *server,
712 const struct rpc_timeout *timeo,
713 rpc_authflavor_t pseudoflavour)
715 struct nfs_client *clp = server->nfs_client;
717 server->client = rpc_clone_client(clp->cl_rpcclient);
718 if (IS_ERR(server->client)) {
719 dprintk("%s: couldn't create rpc_client!\n", __func__);
720 return PTR_ERR(server->client);
723 memcpy(&server->client->cl_timeout_default,
725 sizeof(server->client->cl_timeout_default));
726 server->client->cl_timeout = &server->client->cl_timeout_default;
728 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
729 struct rpc_auth *auth;
731 auth = rpcauth_create(pseudoflavour, server->client);
733 dprintk("%s: couldn't create credcache!\n", __func__);
734 return PTR_ERR(auth);
737 server->client->cl_softrtry = 0;
738 if (server->flags & NFS_MOUNT_SOFT)
739 server->client->cl_softrtry = 1;
745 * Initialise an NFS2 or NFS3 client
747 static int nfs_init_client(struct nfs_client *clp,
748 const struct rpc_timeout *timeparms,
749 const struct nfs_parsed_mount_data *data)
753 if (clp->cl_cons_state == NFS_CS_READY) {
754 /* the client is already initialised */
755 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
760 * Create a client RPC handle for doing FSSTAT with UNIX auth only
761 * - RFC 2623, sec 2.3.2
763 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
764 0, data->flags & NFS_MOUNT_NORESVPORT);
767 nfs_mark_client_ready(clp, NFS_CS_READY);
771 nfs_mark_client_ready(clp, error);
772 dprintk("<-- nfs_init_client() = xerror %d\n", error);
777 * Create a version 2 or 3 client
779 static int nfs_init_server(struct nfs_server *server,
780 const struct nfs_parsed_mount_data *data)
782 struct nfs_client_initdata cl_init = {
783 .hostname = data->nfs_server.hostname,
784 .addr = (const struct sockaddr *)&data->nfs_server.address,
785 .addrlen = data->nfs_server.addrlen,
786 .rpc_ops = &nfs_v2_clientops,
787 .proto = data->nfs_server.protocol,
789 struct rpc_timeout timeparms;
790 struct nfs_client *clp;
793 dprintk("--> nfs_init_server()\n");
796 if (data->version == 3)
797 cl_init.rpc_ops = &nfs_v3_clientops;
800 /* Allocate or find a client reference we can use */
801 clp = nfs_get_client(&cl_init);
803 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
807 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
808 data->timeo, data->retrans);
809 error = nfs_init_client(clp, &timeparms, data);
813 server->nfs_client = clp;
815 /* Initialise the client representation from the mount data */
816 server->flags = data->flags;
817 server->options = data->options;
818 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
819 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
820 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
823 server->rsize = nfs_block_size(data->rsize, NULL);
825 server->wsize = nfs_block_size(data->wsize, NULL);
827 server->acregmin = data->acregmin * HZ;
828 server->acregmax = data->acregmax * HZ;
829 server->acdirmin = data->acdirmin * HZ;
830 server->acdirmax = data->acdirmax * HZ;
832 /* Start lockd here, before we might error out */
833 error = nfs_start_lockd(server);
837 server->port = data->nfs_server.port;
839 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
843 /* Preserve the values of mount_server-related mount options */
844 if (data->mount_server.addrlen) {
845 memcpy(&server->mountd_address, &data->mount_server.address,
846 data->mount_server.addrlen);
847 server->mountd_addrlen = data->mount_server.addrlen;
849 server->mountd_version = data->mount_server.version;
850 server->mountd_port = data->mount_server.port;
851 server->mountd_protocol = data->mount_server.protocol;
853 server->namelen = data->namlen;
854 /* Create a client RPC handle for the NFSv3 ACL management interface */
855 nfs_init_server_aclclient(server);
856 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
860 server->nfs_client = NULL;
862 dprintk("<-- nfs_init_server() = xerror %d\n", error);
867 * Load up the server record from information gained in an fsinfo record
869 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
871 unsigned long max_rpc_payload;
873 /* Work out a lot of parameters */
874 if (server->rsize == 0)
875 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
876 if (server->wsize == 0)
877 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
879 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
880 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
881 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
882 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
884 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
885 if (server->rsize > max_rpc_payload)
886 server->rsize = max_rpc_payload;
887 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
888 server->rsize = NFS_MAX_FILE_IO_SIZE;
889 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
891 server->backing_dev_info.name = "nfs";
892 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
894 if (server->wsize > max_rpc_payload)
895 server->wsize = max_rpc_payload;
896 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
897 server->wsize = NFS_MAX_FILE_IO_SIZE;
898 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
899 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
901 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
902 if (server->dtsize > PAGE_CACHE_SIZE)
903 server->dtsize = PAGE_CACHE_SIZE;
904 if (server->dtsize > server->rsize)
905 server->dtsize = server->rsize;
907 if (server->flags & NFS_MOUNT_NOAC) {
908 server->acregmin = server->acregmax = 0;
909 server->acdirmin = server->acdirmax = 0;
912 server->maxfilesize = fsinfo->maxfilesize;
914 /* We're airborne Set socket buffersize */
915 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
919 * Probe filesystem information, including the FSID on v2/v3
921 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
923 struct nfs_fsinfo fsinfo;
924 struct nfs_client *clp = server->nfs_client;
927 dprintk("--> nfs_probe_fsinfo()\n");
929 if (clp->rpc_ops->set_capabilities != NULL) {
930 error = clp->rpc_ops->set_capabilities(server, mntfh);
935 fsinfo.fattr = fattr;
936 nfs_fattr_init(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->acregmin = source->acregmin;
969 target->acregmax = source->acregmax;
970 target->acdirmin = source->acdirmin;
971 target->acdirmax = source->acdirmax;
972 target->caps = source->caps;
976 * Allocate and initialise a server record
978 static struct nfs_server *nfs_alloc_server(void)
980 struct nfs_server *server;
982 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
986 server->client = server->client_acl = ERR_PTR(-EINVAL);
988 /* Zero out the NFS state stuff */
989 INIT_LIST_HEAD(&server->client_link);
990 INIT_LIST_HEAD(&server->master_link);
992 atomic_set(&server->active, 0);
994 server->io_stats = nfs_alloc_iostats();
995 if (!server->io_stats) {
1000 if (bdi_init(&server->backing_dev_info)) {
1001 nfs_free_iostats(server->io_stats);
1010 * Free up a server record
1012 void nfs_free_server(struct nfs_server *server)
1014 dprintk("--> nfs_free_server()\n");
1016 spin_lock(&nfs_client_lock);
1017 list_del(&server->client_link);
1018 list_del(&server->master_link);
1019 spin_unlock(&nfs_client_lock);
1021 if (server->destroy != NULL)
1022 server->destroy(server);
1024 if (!IS_ERR(server->client_acl))
1025 rpc_shutdown_client(server->client_acl);
1026 if (!IS_ERR(server->client))
1027 rpc_shutdown_client(server->client);
1029 nfs_put_client(server->nfs_client);
1031 nfs_free_iostats(server->io_stats);
1032 bdi_destroy(&server->backing_dev_info);
1034 nfs_release_automount_timer();
1035 dprintk("<-- nfs_free_server()\n");
1039 * Create a version 2 or 3 volume record
1040 * - keyed on server and FSID
1042 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1043 struct nfs_fh *mntfh)
1045 struct nfs_server *server;
1046 struct nfs_fattr fattr;
1049 server = nfs_alloc_server();
1051 return ERR_PTR(-ENOMEM);
1053 /* Get a client representation */
1054 error = nfs_init_server(server, data);
1058 BUG_ON(!server->nfs_client);
1059 BUG_ON(!server->nfs_client->rpc_ops);
1060 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1062 /* Probe the root fh to retrieve its FSID */
1063 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1066 if (server->nfs_client->rpc_ops->version == 3) {
1067 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1068 server->namelen = NFS3_MAXNAMLEN;
1069 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1070 server->caps |= NFS_CAP_READDIRPLUS;
1072 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1073 server->namelen = NFS2_MAXNAMLEN;
1076 if (!(fattr.valid & NFS_ATTR_FATTR)) {
1077 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
1079 dprintk("nfs_create_server: getattr error = %d\n", -error);
1083 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
1085 dprintk("Server FSID: %llx:%llx\n",
1086 (unsigned long long) server->fsid.major,
1087 (unsigned long long) server->fsid.minor);
1089 spin_lock(&nfs_client_lock);
1090 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1091 list_add_tail(&server->master_link, &nfs_volume_list);
1092 spin_unlock(&nfs_client_lock);
1094 server->mount_time = jiffies;
1098 nfs_free_server(server);
1099 return ERR_PTR(error);
1102 #ifdef CONFIG_NFS_V4
1104 * Initialize the NFS4 callback service
1106 static int nfs4_init_callback(struct nfs_client *clp)
1110 if (clp->rpc_ops->version == 4) {
1111 if (nfs4_has_session(clp)) {
1112 error = xprt_setup_backchannel(
1113 clp->cl_rpcclient->cl_xprt,
1114 NFS41_BC_MIN_CALLBACKS);
1119 error = nfs_callback_up(clp->cl_minorversion,
1120 clp->cl_rpcclient->cl_xprt);
1122 dprintk("%s: failed to start callback. Error = %d\n",
1126 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
1132 * Initialize the minor version specific parts of an NFS4 client record
1134 static int nfs4_init_client_minor_version(struct nfs_client *clp)
1136 clp->cl_call_sync = _nfs4_call_sync;
1138 #if defined(CONFIG_NFS_V4_1)
1139 if (clp->cl_minorversion) {
1140 struct nfs4_session *session = NULL;
1142 * Create the session and mark it expired.
1143 * When a SEQUENCE operation encounters the expired session
1144 * it will do session recovery to initialize it.
1146 session = nfs4_alloc_session(clp);
1150 clp->cl_session = session;
1151 clp->cl_call_sync = _nfs4_call_sync_session;
1153 #endif /* CONFIG_NFS_V4_1 */
1155 return nfs4_init_callback(clp);
1159 * Initialise an NFS4 client record
1161 static int nfs4_init_client(struct nfs_client *clp,
1162 const struct rpc_timeout *timeparms,
1163 const char *ip_addr,
1164 rpc_authflavor_t authflavour,
1169 if (clp->cl_cons_state == NFS_CS_READY) {
1170 /* the client is initialised already */
1171 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1175 /* Check NFS protocol revision and initialize RPC op vector */
1176 clp->rpc_ops = &nfs_v4_clientops;
1178 error = nfs_create_rpc_client(clp, timeparms, authflavour,
1179 1, flags & NFS_MOUNT_NORESVPORT);
1182 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1184 error = nfs_idmap_new(clp);
1186 dprintk("%s: failed to create idmapper. Error = %d\n",
1190 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1192 error = nfs4_init_client_minor_version(clp);
1196 if (!nfs4_has_session(clp))
1197 nfs_mark_client_ready(clp, NFS_CS_READY);
1201 nfs_mark_client_ready(clp, error);
1202 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1207 * Set up an NFS4 client
1209 static int nfs4_set_client(struct nfs_server *server,
1210 const char *hostname,
1211 const struct sockaddr *addr,
1212 const size_t addrlen,
1213 const char *ip_addr,
1214 rpc_authflavor_t authflavour,
1215 int proto, const struct rpc_timeout *timeparms,
1218 struct nfs_client_initdata cl_init = {
1219 .hostname = hostname,
1222 .rpc_ops = &nfs_v4_clientops,
1224 .minorversion = minorversion,
1226 struct nfs_client *clp;
1229 dprintk("--> nfs4_set_client()\n");
1231 /* Allocate or find a client reference we can use */
1232 clp = nfs_get_client(&cl_init);
1234 error = PTR_ERR(clp);
1237 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
1242 server->nfs_client = clp;
1243 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1247 nfs_put_client(clp);
1249 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1255 * Session has been established, and the client marked ready.
1256 * Set the mount rsize and wsize with negotiated fore channel
1257 * attributes which will be bound checked in nfs_server_set_fsinfo.
1259 static void nfs4_session_set_rwsize(struct nfs_server *server)
1261 #ifdef CONFIG_NFS_V4_1
1262 if (!nfs4_has_session(server->nfs_client))
1264 server->rsize = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
1265 server->wsize = server->nfs_client->cl_session->fc_attrs.max_rqst_sz;
1266 #endif /* CONFIG_NFS_V4_1 */
1270 * Create a version 4 volume record
1272 static int nfs4_init_server(struct nfs_server *server,
1273 const struct nfs_parsed_mount_data *data)
1275 struct rpc_timeout timeparms;
1278 dprintk("--> nfs4_init_server()\n");
1280 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1281 data->timeo, data->retrans);
1283 /* Initialise the client representation from the mount data */
1284 server->flags = data->flags;
1285 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1286 server->options = data->options;
1288 /* Get a client record */
1289 error = nfs4_set_client(server,
1290 data->nfs_server.hostname,
1291 (const struct sockaddr *)&data->nfs_server.address,
1292 data->nfs_server.addrlen,
1293 data->client_address,
1294 data->auth_flavors[0],
1295 data->nfs_server.protocol,
1297 data->minorversion);
1302 server->rsize = nfs_block_size(data->rsize, NULL);
1304 server->wsize = nfs_block_size(data->wsize, NULL);
1306 server->acregmin = data->acregmin * HZ;
1307 server->acregmax = data->acregmax * HZ;
1308 server->acdirmin = data->acdirmin * HZ;
1309 server->acdirmax = data->acdirmax * HZ;
1311 server->port = data->nfs_server.port;
1313 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1317 dprintk("<-- nfs4_init_server() = %d\n", error);
1322 * Create a version 4 volume record
1323 * - keyed on server and FSID
1325 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1326 struct nfs_fh *mntfh)
1328 struct nfs_fattr fattr;
1329 struct nfs_server *server;
1332 dprintk("--> nfs4_create_server()\n");
1334 server = nfs_alloc_server();
1336 return ERR_PTR(-ENOMEM);
1338 /* set up the general RPC client */
1339 error = nfs4_init_server(server, data);
1343 BUG_ON(!server->nfs_client);
1344 BUG_ON(!server->nfs_client->rpc_ops);
1345 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1347 error = nfs4_init_session(server);
1351 /* Probe the root fh to retrieve its FSID */
1352 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1356 dprintk("Server FSID: %llx:%llx\n",
1357 (unsigned long long) server->fsid.major,
1358 (unsigned long long) server->fsid.minor);
1359 dprintk("Mount FH: %d\n", mntfh->size);
1361 nfs4_session_set_rwsize(server);
1363 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1367 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1368 server->namelen = NFS4_MAXNAMLEN;
1370 spin_lock(&nfs_client_lock);
1371 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1372 list_add_tail(&server->master_link, &nfs_volume_list);
1373 spin_unlock(&nfs_client_lock);
1375 server->mount_time = jiffies;
1376 dprintk("<-- nfs4_create_server() = %p\n", server);
1380 nfs_free_server(server);
1381 dprintk("<-- nfs4_create_server() = error %d\n", error);
1382 return ERR_PTR(error);
1386 * Create an NFS4 referral server record
1388 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1389 struct nfs_fh *mntfh)
1391 struct nfs_client *parent_client;
1392 struct nfs_server *server, *parent_server;
1393 struct nfs_fattr fattr;
1396 dprintk("--> nfs4_create_referral_server()\n");
1398 server = nfs_alloc_server();
1400 return ERR_PTR(-ENOMEM);
1402 parent_server = NFS_SB(data->sb);
1403 parent_client = parent_server->nfs_client;
1405 /* Initialise the client representation from the parent server */
1406 nfs_server_copy_userdata(server, parent_server);
1407 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1409 /* Get a client representation.
1410 * Note: NFSv4 always uses TCP, */
1411 error = nfs4_set_client(server, data->hostname,
1414 parent_client->cl_ipaddr,
1416 parent_server->client->cl_xprt->prot,
1417 parent_server->client->cl_timeout,
1418 parent_client->cl_minorversion);
1422 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1426 BUG_ON(!server->nfs_client);
1427 BUG_ON(!server->nfs_client->rpc_ops);
1428 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1430 /* Probe the root fh to retrieve its FSID and filehandle */
1431 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1435 /* probe the filesystem info for this server filesystem */
1436 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1440 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1441 server->namelen = NFS4_MAXNAMLEN;
1443 dprintk("Referral FSID: %llx:%llx\n",
1444 (unsigned long long) server->fsid.major,
1445 (unsigned long long) server->fsid.minor);
1447 spin_lock(&nfs_client_lock);
1448 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1449 list_add_tail(&server->master_link, &nfs_volume_list);
1450 spin_unlock(&nfs_client_lock);
1452 server->mount_time = jiffies;
1454 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1458 nfs_free_server(server);
1459 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1460 return ERR_PTR(error);
1463 #endif /* CONFIG_NFS_V4 */
1466 * Clone an NFS2, NFS3 or NFS4 server record
1468 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1470 struct nfs_fattr *fattr)
1472 struct nfs_server *server;
1473 struct nfs_fattr fattr_fsinfo;
1476 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1477 (unsigned long long) fattr->fsid.major,
1478 (unsigned long long) fattr->fsid.minor);
1480 server = nfs_alloc_server();
1482 return ERR_PTR(-ENOMEM);
1484 /* Copy data from the source */
1485 server->nfs_client = source->nfs_client;
1486 atomic_inc(&server->nfs_client->cl_count);
1487 nfs_server_copy_userdata(server, source);
1489 server->fsid = fattr->fsid;
1491 error = nfs_init_server_rpcclient(server,
1492 source->client->cl_timeout,
1493 source->client->cl_auth->au_flavor);
1495 goto out_free_server;
1496 if (!IS_ERR(source->client_acl))
1497 nfs_init_server_aclclient(server);
1499 /* probe the filesystem info for this server filesystem */
1500 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1502 goto out_free_server;
1504 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1505 server->namelen = NFS4_MAXNAMLEN;
1507 dprintk("Cloned FSID: %llx:%llx\n",
1508 (unsigned long long) server->fsid.major,
1509 (unsigned long long) server->fsid.minor);
1511 error = nfs_start_lockd(server);
1513 goto out_free_server;
1515 spin_lock(&nfs_client_lock);
1516 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1517 list_add_tail(&server->master_link, &nfs_volume_list);
1518 spin_unlock(&nfs_client_lock);
1520 server->mount_time = jiffies;
1522 dprintk("<-- nfs_clone_server() = %p\n", server);
1526 nfs_free_server(server);
1527 dprintk("<-- nfs_clone_server() = error %d\n", error);
1528 return ERR_PTR(error);
1531 #ifdef CONFIG_PROC_FS
1532 static struct proc_dir_entry *proc_fs_nfs;
1534 static int nfs_server_list_open(struct inode *inode, struct file *file);
1535 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1536 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1537 static void nfs_server_list_stop(struct seq_file *p, void *v);
1538 static int nfs_server_list_show(struct seq_file *m, void *v);
1540 static const struct seq_operations nfs_server_list_ops = {
1541 .start = nfs_server_list_start,
1542 .next = nfs_server_list_next,
1543 .stop = nfs_server_list_stop,
1544 .show = nfs_server_list_show,
1547 static const struct file_operations nfs_server_list_fops = {
1548 .open = nfs_server_list_open,
1550 .llseek = seq_lseek,
1551 .release = seq_release,
1552 .owner = THIS_MODULE,
1555 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1556 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1557 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1558 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1559 static int nfs_volume_list_show(struct seq_file *m, void *v);
1561 static const struct seq_operations nfs_volume_list_ops = {
1562 .start = nfs_volume_list_start,
1563 .next = nfs_volume_list_next,
1564 .stop = nfs_volume_list_stop,
1565 .show = nfs_volume_list_show,
1568 static const struct file_operations nfs_volume_list_fops = {
1569 .open = nfs_volume_list_open,
1571 .llseek = seq_lseek,
1572 .release = seq_release,
1573 .owner = THIS_MODULE,
1577 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1580 static int nfs_server_list_open(struct inode *inode, struct file *file)
1585 ret = seq_open(file, &nfs_server_list_ops);
1589 m = file->private_data;
1590 m->private = PDE(inode)->data;
1596 * set up the iterator to start reading from the server list and return the first item
1598 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1600 /* lock the list against modification */
1601 spin_lock(&nfs_client_lock);
1602 return seq_list_start_head(&nfs_client_list, *_pos);
1606 * move to next server
1608 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1610 return seq_list_next(v, &nfs_client_list, pos);
1614 * clean up after reading from the transports list
1616 static void nfs_server_list_stop(struct seq_file *p, void *v)
1618 spin_unlock(&nfs_client_lock);
1622 * display a header line followed by a load of call lines
1624 static int nfs_server_list_show(struct seq_file *m, void *v)
1626 struct nfs_client *clp;
1628 /* display header on line 1 */
1629 if (v == &nfs_client_list) {
1630 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1634 /* display one transport per line on subsequent lines */
1635 clp = list_entry(v, struct nfs_client, cl_share_link);
1637 seq_printf(m, "v%u %s %s %3d %s\n",
1638 clp->rpc_ops->version,
1639 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1640 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1641 atomic_read(&clp->cl_count),
1648 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1650 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1655 ret = seq_open(file, &nfs_volume_list_ops);
1659 m = file->private_data;
1660 m->private = PDE(inode)->data;
1666 * set up the iterator to start reading from the volume list and return the first item
1668 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1670 /* lock the list against modification */
1671 spin_lock(&nfs_client_lock);
1672 return seq_list_start_head(&nfs_volume_list, *_pos);
1676 * move to next volume
1678 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1680 return seq_list_next(v, &nfs_volume_list, pos);
1684 * clean up after reading from the transports list
1686 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1688 spin_unlock(&nfs_client_lock);
1692 * display a header line followed by a load of call lines
1694 static int nfs_volume_list_show(struct seq_file *m, void *v)
1696 struct nfs_server *server;
1697 struct nfs_client *clp;
1698 char dev[8], fsid[17];
1700 /* display header on line 1 */
1701 if (v == &nfs_volume_list) {
1702 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
1705 /* display one transport per line on subsequent lines */
1706 server = list_entry(v, struct nfs_server, master_link);
1707 clp = server->nfs_client;
1709 snprintf(dev, 8, "%u:%u",
1710 MAJOR(server->s_dev), MINOR(server->s_dev));
1712 snprintf(fsid, 17, "%llx:%llx",
1713 (unsigned long long) server->fsid.major,
1714 (unsigned long long) server->fsid.minor);
1716 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1717 clp->rpc_ops->version,
1718 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1719 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1722 nfs_server_fscache_state(server));
1728 * initialise the /proc/fs/nfsfs/ directory
1730 int __init nfs_fs_proc_init(void)
1732 struct proc_dir_entry *p;
1734 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1738 /* a file of servers with which we're dealing */
1739 p = proc_create("servers", S_IFREG|S_IRUGO,
1740 proc_fs_nfs, &nfs_server_list_fops);
1744 /* a file of volumes that we have mounted */
1745 p = proc_create("volumes", S_IFREG|S_IRUGO,
1746 proc_fs_nfs, &nfs_volume_list_fops);
1752 remove_proc_entry("servers", proc_fs_nfs);
1754 remove_proc_entry("fs/nfsfs", NULL);
1760 * clean up the /proc/fs/nfsfs/ directory
1762 void nfs_fs_proc_exit(void)
1764 remove_proc_entry("volumes", proc_fs_nfs);
1765 remove_proc_entry("servers", proc_fs_nfs);
1766 remove_proc_entry("fs/nfsfs", NULL);
1769 #endif /* CONFIG_PROC_FS */