1 /* client.c: NFS client sharing and management code
3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/sched.h>
16 #include <linux/time.h>
17 #include <linux/kernel.h>
19 #include <linux/string.h>
20 #include <linux/stat.h>
21 #include <linux/errno.h>
22 #include <linux/unistd.h>
23 #include <linux/sunrpc/clnt.h>
24 #include <linux/sunrpc/stats.h>
25 #include <linux/sunrpc/metrics.h>
26 #include <linux/sunrpc/xprtsock.h>
27 #include <linux/sunrpc/xprtrdma.h>
28 #include <linux/nfs_fs.h>
29 #include <linux/nfs_mount.h>
30 #include <linux/nfs4_mount.h>
31 #include <linux/lockd/bind.h>
32 #include <linux/seq_file.h>
33 #include <linux/mount.h>
34 #include <linux/nfs_idmap.h>
35 #include <linux/vfs.h>
36 #include <linux/inet.h>
37 #include <linux/in6.h>
38 #include <linux/slab.h>
40 #include <linux/nfs_xdr.h>
41 #include <linux/sunrpc/bc_xprt.h>
43 #include <asm/system.h>
47 #include "delegation.h"
53 #define NFSDBG_FACILITY NFSDBG_CLIENT
55 static DEFINE_SPINLOCK(nfs_client_lock);
56 static LIST_HEAD(nfs_client_list);
57 static LIST_HEAD(nfs_volume_list);
58 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
63 static struct rpc_version *nfs_version[5] = {
73 struct rpc_program nfs_program = {
75 .number = NFS_PROGRAM,
76 .nrvers = ARRAY_SIZE(nfs_version),
77 .version = nfs_version,
78 .stats = &nfs_rpcstat,
79 .pipe_dir_name = "/nfs",
82 struct rpc_stat nfs_rpcstat = {
83 .program = &nfs_program
87 #ifdef CONFIG_NFS_V3_ACL
88 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
89 static struct rpc_version * nfsacl_version[] = {
90 [3] = &nfsacl_version3,
93 struct rpc_program nfsacl_program = {
95 .number = NFS_ACL_PROGRAM,
96 .nrvers = ARRAY_SIZE(nfsacl_version),
97 .version = nfsacl_version,
98 .stats = &nfsacl_rpcstat,
100 #endif /* CONFIG_NFS_V3_ACL */
102 struct nfs_client_initdata {
103 const char *hostname;
104 const struct sockaddr *addr;
106 const struct nfs_rpc_ops *rpc_ops;
112 * Allocate a shared client record
114 * Since these are allocated/deallocated very rarely, we don't
115 * bother putting them in a slab cache...
117 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
119 struct nfs_client *clp;
120 struct rpc_cred *cred;
123 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
126 clp->rpc_ops = cl_init->rpc_ops;
128 atomic_set(&clp->cl_count, 1);
129 clp->cl_cons_state = NFS_CS_INITING;
131 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
132 clp->cl_addrlen = cl_init->addrlen;
134 if (cl_init->hostname) {
136 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
137 if (!clp->cl_hostname)
141 INIT_LIST_HEAD(&clp->cl_superblocks);
142 clp->cl_rpcclient = ERR_PTR(-EINVAL);
144 clp->cl_proto = cl_init->proto;
147 INIT_LIST_HEAD(&clp->cl_delegations);
148 spin_lock_init(&clp->cl_lock);
149 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
150 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
151 clp->cl_boot_time = CURRENT_TIME;
152 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
153 clp->cl_minorversion = cl_init->minorversion;
154 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
156 cred = rpc_lookup_machine_cred();
158 clp->cl_machine_cred = cred;
159 #if defined(CONFIG_NFS_V4_1)
160 INIT_LIST_HEAD(&clp->cl_layouts);
162 nfs_fscache_get_client_cookie(clp);
174 * Clears/puts all minor version specific parts from an nfs_client struct
175 * reverting it to minorversion 0.
177 static void nfs4_clear_client_minor_version(struct nfs_client *clp)
179 #ifdef CONFIG_NFS_V4_1
180 if (nfs4_has_session(clp)) {
181 nfs4_destroy_session(clp->cl_session);
182 clp->cl_session = NULL;
185 clp->cl_mvops = nfs_v4_minor_ops[0];
186 #endif /* CONFIG_NFS_V4_1 */
190 * Destroy the NFS4 callback service
192 static void nfs4_destroy_callback(struct nfs_client *clp)
194 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
195 nfs_callback_down(clp->cl_mvops->minor_version);
198 static void nfs4_shutdown_client(struct nfs_client *clp)
200 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
201 nfs4_kill_renewd(clp);
202 nfs4_clear_client_minor_version(clp);
203 nfs4_destroy_callback(clp);
204 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
205 nfs_idmap_delete(clp);
207 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
210 static void nfs4_shutdown_client(struct nfs_client *clp)
213 #endif /* CONFIG_NFS_V4 */
216 * Destroy a shared client record
218 static void nfs_free_client(struct nfs_client *clp)
220 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
222 nfs4_shutdown_client(clp);
224 nfs_fscache_release_client_cookie(clp);
226 /* -EIO all pending I/O */
227 if (!IS_ERR(clp->cl_rpcclient))
228 rpc_shutdown_client(clp->cl_rpcclient);
230 if (clp->cl_machine_cred != NULL)
231 put_rpccred(clp->cl_machine_cred);
233 kfree(clp->cl_hostname);
236 dprintk("<-- nfs_free_client()\n");
240 * Release a reference to a shared client record
242 void nfs_put_client(struct nfs_client *clp)
247 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
249 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
250 list_del(&clp->cl_share_link);
251 spin_unlock(&nfs_client_lock);
253 BUG_ON(!list_empty(&clp->cl_superblocks));
255 nfs_free_client(clp);
258 EXPORT_SYMBOL_GPL(nfs_put_client);
260 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
262 * Test if two ip6 socket addresses refer to the same socket by
263 * comparing relevant fields. The padding bytes specifically, are not
264 * compared. sin6_flowinfo is not compared because it only affects QoS
265 * and sin6_scope_id is only compared if the address is "link local"
266 * because "link local" addresses need only be unique to a specific
267 * link. Conversely, ordinary unicast addresses might have different
270 * The caller should ensure both socket addresses are AF_INET6.
272 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
273 const struct sockaddr *sa2)
275 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
276 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
278 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
279 sin1->sin6_scope_id != sin2->sin6_scope_id)
282 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
284 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
285 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
286 const struct sockaddr *sa2)
293 * Test if two ip4 socket addresses refer to the same socket, by
294 * comparing relevant fields. The padding bytes specifically, are
297 * The caller should ensure both socket addresses are AF_INET.
299 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
300 const struct sockaddr *sa2)
302 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
303 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
305 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
308 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
309 const struct sockaddr *sa2)
311 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
312 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
314 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
315 (sin1->sin6_port == sin2->sin6_port);
318 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
319 const struct sockaddr *sa2)
321 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
322 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
324 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
325 (sin1->sin_port == sin2->sin_port);
329 * Test if two socket addresses represent the same actual socket,
330 * by comparing (only) relevant fields, excluding the port number.
332 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
333 const struct sockaddr *sa2)
335 if (sa1->sa_family != sa2->sa_family)
338 switch (sa1->sa_family) {
340 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
342 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
348 * Test if two socket addresses represent the same actual socket,
349 * by comparing (only) relevant fields, including the port number.
351 static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
352 const struct sockaddr *sa2)
354 if (sa1->sa_family != sa2->sa_family)
357 switch (sa1->sa_family) {
359 return nfs_sockaddr_cmp_ip4(sa1, sa2);
361 return nfs_sockaddr_cmp_ip6(sa1, sa2);
367 * Find a client by IP address and protocol version
368 * - returns NULL if no such client
370 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
372 struct nfs_client *clp;
374 spin_lock(&nfs_client_lock);
375 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
376 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
378 /* Don't match clients that failed to initialise properly */
379 if (!(clp->cl_cons_state == NFS_CS_READY ||
380 clp->cl_cons_state == NFS_CS_SESSION_INITING))
383 /* Different NFS versions cannot share the same nfs_client */
384 if (clp->rpc_ops->version != nfsversion)
387 /* Match only the IP address, not the port number */
388 if (!nfs_sockaddr_match_ipaddr(addr, clap))
391 atomic_inc(&clp->cl_count);
392 spin_unlock(&nfs_client_lock);
395 spin_unlock(&nfs_client_lock);
400 * Find a client by IP address and protocol version
401 * - returns NULL if no such client
403 struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
405 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
406 u32 nfsvers = clp->rpc_ops->version;
408 spin_lock(&nfs_client_lock);
409 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
410 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
412 /* Don't match clients that failed to initialise properly */
413 if (clp->cl_cons_state != NFS_CS_READY)
416 /* Different NFS versions cannot share the same nfs_client */
417 if (clp->rpc_ops->version != nfsvers)
420 /* Match only the IP address, not the port number */
421 if (!nfs_sockaddr_match_ipaddr(sap, clap))
424 atomic_inc(&clp->cl_count);
425 spin_unlock(&nfs_client_lock);
428 spin_unlock(&nfs_client_lock);
433 * Find an nfs_client on the list that matches the initialisation data
436 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
438 struct nfs_client *clp;
439 const struct sockaddr *sap = data->addr;
441 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
442 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
443 /* Don't match clients that failed to initialise properly */
444 if (clp->cl_cons_state < 0)
447 /* Different NFS versions cannot share the same nfs_client */
448 if (clp->rpc_ops != data->rpc_ops)
451 if (clp->cl_proto != data->proto)
453 /* Match nfsv4 minorversion */
454 if (clp->cl_minorversion != data->minorversion)
456 /* Match the full socket address */
457 if (!nfs_sockaddr_cmp(sap, clap))
460 atomic_inc(&clp->cl_count);
467 * Look up a client by IP address and protocol version
468 * - creates a new record if one doesn't yet exist
470 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
472 struct nfs_client *clp, *new = NULL;
475 dprintk("--> nfs_get_client(%s,v%u)\n",
476 cl_init->hostname ?: "", cl_init->rpc_ops->version);
478 /* see if the client already exists */
480 spin_lock(&nfs_client_lock);
482 clp = nfs_match_client(cl_init);
488 spin_unlock(&nfs_client_lock);
490 new = nfs_alloc_client(cl_init);
491 } while (!IS_ERR(new));
493 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
496 /* install a new client and return with it unready */
499 list_add(&clp->cl_share_link, &nfs_client_list);
500 spin_unlock(&nfs_client_lock);
501 dprintk("--> nfs_get_client() = %p [new]\n", clp);
504 /* found an existing client
505 * - make sure it's ready before returning
508 spin_unlock(&nfs_client_lock);
511 nfs_free_client(new);
513 error = wait_event_killable(nfs_client_active_wq,
514 clp->cl_cons_state < NFS_CS_INITING);
517 return ERR_PTR(-ERESTARTSYS);
520 if (clp->cl_cons_state < NFS_CS_READY) {
521 error = clp->cl_cons_state;
523 return ERR_PTR(error);
526 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
528 dprintk("--> nfs_get_client() = %p [share]\n", clp);
533 * Mark a server as ready or failed
535 void nfs_mark_client_ready(struct nfs_client *clp, int state)
537 clp->cl_cons_state = state;
538 wake_up_all(&nfs_client_active_wq);
542 * With sessions, the client is not marked ready until after a
543 * successful EXCHANGE_ID and CREATE_SESSION.
545 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
546 * other versions of NFS can be tried.
548 int nfs4_check_client_ready(struct nfs_client *clp)
550 if (!nfs4_has_session(clp))
552 if (clp->cl_cons_state < NFS_CS_READY)
553 return -EPROTONOSUPPORT;
558 * Initialise the timeout values for a connection
560 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
561 unsigned int timeo, unsigned int retrans)
563 to->to_initval = timeo * HZ / 10;
564 to->to_retries = retrans;
567 case XPRT_TRANSPORT_TCP:
568 case XPRT_TRANSPORT_RDMA:
569 if (to->to_retries == 0)
570 to->to_retries = NFS_DEF_TCP_RETRANS;
571 if (to->to_initval == 0)
572 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
573 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
574 to->to_initval = NFS_MAX_TCP_TIMEOUT;
575 to->to_increment = to->to_initval;
576 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
577 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
578 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
579 if (to->to_maxval < to->to_initval)
580 to->to_maxval = to->to_initval;
581 to->to_exponential = 0;
583 case XPRT_TRANSPORT_UDP:
584 if (to->to_retries == 0)
585 to->to_retries = NFS_DEF_UDP_RETRANS;
587 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
588 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
589 to->to_initval = NFS_MAX_UDP_TIMEOUT;
590 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
591 to->to_exponential = 1;
599 * Create an RPC client handle
601 static int nfs_create_rpc_client(struct nfs_client *clp,
602 const struct rpc_timeout *timeparms,
603 rpc_authflavor_t flavor,
604 int discrtry, int noresvport)
606 struct rpc_clnt *clnt = NULL;
607 struct rpc_create_args args = {
608 .protocol = clp->cl_proto,
609 .address = (struct sockaddr *)&clp->cl_addr,
610 .addrsize = clp->cl_addrlen,
611 .timeout = timeparms,
612 .servername = clp->cl_hostname,
613 .program = &nfs_program,
614 .version = clp->rpc_ops->version,
615 .authflavor = flavor,
619 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
621 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
623 if (!IS_ERR(clp->cl_rpcclient))
626 clnt = rpc_create(&args);
628 dprintk("%s: cannot create RPC client. Error = %ld\n",
629 __func__, PTR_ERR(clnt));
630 return PTR_ERR(clnt);
633 clp->cl_rpcclient = clnt;
638 * Version 2 or 3 client destruction
640 static void nfs_destroy_server(struct nfs_server *server)
642 if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) ||
643 !(server->flags & NFS_MOUNT_LOCAL_FCNTL))
644 nlmclnt_done(server->nlm_host);
648 * Version 2 or 3 lockd setup
650 static int nfs_start_lockd(struct nfs_server *server)
652 struct nlm_host *host;
653 struct nfs_client *clp = server->nfs_client;
654 struct nlmclnt_initdata nlm_init = {
655 .hostname = clp->cl_hostname,
656 .address = (struct sockaddr *)&clp->cl_addr,
657 .addrlen = clp->cl_addrlen,
658 .nfs_version = clp->rpc_ops->version,
659 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
663 if (nlm_init.nfs_version > 3)
665 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
666 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
669 switch (clp->cl_proto) {
671 nlm_init.protocol = IPPROTO_TCP;
673 case XPRT_TRANSPORT_UDP:
674 nlm_init.protocol = IPPROTO_UDP;
677 host = nlmclnt_init(&nlm_init);
679 return PTR_ERR(host);
681 server->nlm_host = host;
682 server->destroy = nfs_destroy_server;
687 * Initialise an NFSv3 ACL client connection
689 #ifdef CONFIG_NFS_V3_ACL
690 static void nfs_init_server_aclclient(struct nfs_server *server)
692 if (server->nfs_client->rpc_ops->version != 3)
694 if (server->flags & NFS_MOUNT_NOACL)
697 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
698 if (IS_ERR(server->client_acl))
701 /* No errors! Assume that Sun nfsacls are supported */
702 server->caps |= NFS_CAP_ACLS;
706 server->caps &= ~NFS_CAP_ACLS;
709 static inline void nfs_init_server_aclclient(struct nfs_server *server)
711 server->flags &= ~NFS_MOUNT_NOACL;
712 server->caps &= ~NFS_CAP_ACLS;
717 * Create a general RPC client
719 static int nfs_init_server_rpcclient(struct nfs_server *server,
720 const struct rpc_timeout *timeo,
721 rpc_authflavor_t pseudoflavour)
723 struct nfs_client *clp = server->nfs_client;
725 server->client = rpc_clone_client(clp->cl_rpcclient);
726 if (IS_ERR(server->client)) {
727 dprintk("%s: couldn't create rpc_client!\n", __func__);
728 return PTR_ERR(server->client);
731 memcpy(&server->client->cl_timeout_default,
733 sizeof(server->client->cl_timeout_default));
734 server->client->cl_timeout = &server->client->cl_timeout_default;
736 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
737 struct rpc_auth *auth;
739 auth = rpcauth_create(pseudoflavour, server->client);
741 dprintk("%s: couldn't create credcache!\n", __func__);
742 return PTR_ERR(auth);
745 server->client->cl_softrtry = 0;
746 if (server->flags & NFS_MOUNT_SOFT)
747 server->client->cl_softrtry = 1;
753 * Initialise an NFS2 or NFS3 client
755 static int nfs_init_client(struct nfs_client *clp,
756 const struct rpc_timeout *timeparms,
757 const struct nfs_parsed_mount_data *data)
761 if (clp->cl_cons_state == NFS_CS_READY) {
762 /* the client is already initialised */
763 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
768 * Create a client RPC handle for doing FSSTAT with UNIX auth only
769 * - RFC 2623, sec 2.3.2
771 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
772 0, data->flags & NFS_MOUNT_NORESVPORT);
775 nfs_mark_client_ready(clp, NFS_CS_READY);
779 nfs_mark_client_ready(clp, error);
780 dprintk("<-- nfs_init_client() = xerror %d\n", error);
785 * Create a version 2 or 3 client
787 static int nfs_init_server(struct nfs_server *server,
788 const struct nfs_parsed_mount_data *data)
790 struct nfs_client_initdata cl_init = {
791 .hostname = data->nfs_server.hostname,
792 .addr = (const struct sockaddr *)&data->nfs_server.address,
793 .addrlen = data->nfs_server.addrlen,
794 .rpc_ops = &nfs_v2_clientops,
795 .proto = data->nfs_server.protocol,
797 struct rpc_timeout timeparms;
798 struct nfs_client *clp;
801 dprintk("--> nfs_init_server()\n");
804 if (data->version == 3)
805 cl_init.rpc_ops = &nfs_v3_clientops;
808 /* Allocate or find a client reference we can use */
809 clp = nfs_get_client(&cl_init);
811 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
815 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
816 data->timeo, data->retrans);
817 error = nfs_init_client(clp, &timeparms, data);
821 server->nfs_client = clp;
823 /* Initialise the client representation from the mount data */
824 server->flags = data->flags;
825 server->options = data->options;
826 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
827 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
828 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
831 server->rsize = nfs_block_size(data->rsize, NULL);
833 server->wsize = nfs_block_size(data->wsize, NULL);
835 server->acregmin = data->acregmin * HZ;
836 server->acregmax = data->acregmax * HZ;
837 server->acdirmin = data->acdirmin * HZ;
838 server->acdirmax = data->acdirmax * HZ;
840 /* Start lockd here, before we might error out */
841 error = nfs_start_lockd(server);
845 server->port = data->nfs_server.port;
847 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
851 /* Preserve the values of mount_server-related mount options */
852 if (data->mount_server.addrlen) {
853 memcpy(&server->mountd_address, &data->mount_server.address,
854 data->mount_server.addrlen);
855 server->mountd_addrlen = data->mount_server.addrlen;
857 server->mountd_version = data->mount_server.version;
858 server->mountd_port = data->mount_server.port;
859 server->mountd_protocol = data->mount_server.protocol;
861 server->namelen = data->namlen;
862 /* Create a client RPC handle for the NFSv3 ACL management interface */
863 nfs_init_server_aclclient(server);
864 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
868 server->nfs_client = NULL;
870 dprintk("<-- nfs_init_server() = xerror %d\n", error);
875 * Load up the server record from information gained in an fsinfo record
877 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
879 unsigned long max_rpc_payload;
881 /* Work out a lot of parameters */
882 if (server->rsize == 0)
883 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
884 if (server->wsize == 0)
885 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
887 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
888 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
889 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
890 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
892 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
893 if (server->rsize > max_rpc_payload)
894 server->rsize = max_rpc_payload;
895 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
896 server->rsize = NFS_MAX_FILE_IO_SIZE;
897 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
899 server->backing_dev_info.name = "nfs";
900 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
902 if (server->wsize > max_rpc_payload)
903 server->wsize = max_rpc_payload;
904 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
905 server->wsize = NFS_MAX_FILE_IO_SIZE;
906 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
907 set_pnfs_layoutdriver(server, fsinfo->layouttype);
909 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
911 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
912 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
913 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
914 if (server->dtsize > server->rsize)
915 server->dtsize = server->rsize;
917 if (server->flags & NFS_MOUNT_NOAC) {
918 server->acregmin = server->acregmax = 0;
919 server->acdirmin = server->acdirmax = 0;
922 server->maxfilesize = fsinfo->maxfilesize;
924 server->time_delta = fsinfo->time_delta;
926 /* We're airborne Set socket buffersize */
927 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
931 * Probe filesystem information, including the FSID on v2/v3
933 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
935 struct nfs_fsinfo fsinfo;
936 struct nfs_client *clp = server->nfs_client;
939 dprintk("--> nfs_probe_fsinfo()\n");
941 if (clp->rpc_ops->set_capabilities != NULL) {
942 error = clp->rpc_ops->set_capabilities(server, mntfh);
947 fsinfo.fattr = fattr;
948 fsinfo.layouttype = 0;
949 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
953 nfs_server_set_fsinfo(server, &fsinfo);
955 /* Get some general file system info */
956 if (server->namelen == 0) {
957 struct nfs_pathconf pathinfo;
959 pathinfo.fattr = fattr;
960 nfs_fattr_init(fattr);
962 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
963 server->namelen = pathinfo.max_namelen;
966 dprintk("<-- nfs_probe_fsinfo() = 0\n");
970 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
975 * Copy useful information when duplicating a server record
977 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
979 target->flags = source->flags;
980 target->rsize = source->rsize;
981 target->wsize = source->wsize;
982 target->acregmin = source->acregmin;
983 target->acregmax = source->acregmax;
984 target->acdirmin = source->acdirmin;
985 target->acdirmax = source->acdirmax;
986 target->caps = source->caps;
987 target->options = source->options;
991 * Allocate and initialise a server record
993 static struct nfs_server *nfs_alloc_server(void)
995 struct nfs_server *server;
997 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
1001 server->client = server->client_acl = ERR_PTR(-EINVAL);
1003 /* Zero out the NFS state stuff */
1004 INIT_LIST_HEAD(&server->client_link);
1005 INIT_LIST_HEAD(&server->master_link);
1007 atomic_set(&server->active, 0);
1009 server->io_stats = nfs_alloc_iostats();
1010 if (!server->io_stats) {
1015 if (bdi_init(&server->backing_dev_info)) {
1016 nfs_free_iostats(server->io_stats);
1025 * Free up a server record
1027 void nfs_free_server(struct nfs_server *server)
1029 dprintk("--> nfs_free_server()\n");
1031 unset_pnfs_layoutdriver(server);
1032 spin_lock(&nfs_client_lock);
1033 list_del(&server->client_link);
1034 list_del(&server->master_link);
1035 spin_unlock(&nfs_client_lock);
1037 if (server->destroy != NULL)
1038 server->destroy(server);
1040 if (!IS_ERR(server->client_acl))
1041 rpc_shutdown_client(server->client_acl);
1042 if (!IS_ERR(server->client))
1043 rpc_shutdown_client(server->client);
1045 nfs_put_client(server->nfs_client);
1047 nfs_free_iostats(server->io_stats);
1048 bdi_destroy(&server->backing_dev_info);
1050 nfs_release_automount_timer();
1051 dprintk("<-- nfs_free_server()\n");
1055 * Create a version 2 or 3 volume record
1056 * - keyed on server and FSID
1058 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1059 struct nfs_fh *mntfh)
1061 struct nfs_server *server;
1062 struct nfs_fattr *fattr;
1065 server = nfs_alloc_server();
1067 return ERR_PTR(-ENOMEM);
1070 fattr = nfs_alloc_fattr();
1074 /* Get a client representation */
1075 error = nfs_init_server(server, data);
1079 BUG_ON(!server->nfs_client);
1080 BUG_ON(!server->nfs_client->rpc_ops);
1081 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1083 /* Probe the root fh to retrieve its FSID */
1084 error = nfs_probe_fsinfo(server, mntfh, fattr);
1087 if (server->nfs_client->rpc_ops->version == 3) {
1088 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1089 server->namelen = NFS3_MAXNAMLEN;
1090 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1091 server->caps |= NFS_CAP_READDIRPLUS;
1093 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1094 server->namelen = NFS2_MAXNAMLEN;
1097 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1098 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
1100 dprintk("nfs_create_server: getattr error = %d\n", -error);
1104 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1106 dprintk("Server FSID: %llx:%llx\n",
1107 (unsigned long long) server->fsid.major,
1108 (unsigned long long) server->fsid.minor);
1110 spin_lock(&nfs_client_lock);
1111 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1112 list_add_tail(&server->master_link, &nfs_volume_list);
1113 spin_unlock(&nfs_client_lock);
1115 server->mount_time = jiffies;
1116 nfs_free_fattr(fattr);
1120 nfs_free_fattr(fattr);
1121 nfs_free_server(server);
1122 return ERR_PTR(error);
1125 #ifdef CONFIG_NFS_V4
1127 * Initialize the NFS4 callback service
1129 static int nfs4_init_callback(struct nfs_client *clp)
1133 if (clp->rpc_ops->version == 4) {
1134 if (nfs4_has_session(clp)) {
1135 error = xprt_setup_backchannel(
1136 clp->cl_rpcclient->cl_xprt,
1137 NFS41_BC_MIN_CALLBACKS);
1142 error = nfs_callback_up(clp->cl_mvops->minor_version,
1143 clp->cl_rpcclient->cl_xprt);
1145 dprintk("%s: failed to start callback. Error = %d\n",
1149 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
1155 * Initialize the minor version specific parts of an NFS4 client record
1157 static int nfs4_init_client_minor_version(struct nfs_client *clp)
1159 #if defined(CONFIG_NFS_V4_1)
1160 if (clp->cl_mvops->minor_version) {
1161 struct nfs4_session *session = NULL;
1163 * Create the session and mark it expired.
1164 * When a SEQUENCE operation encounters the expired session
1165 * it will do session recovery to initialize it.
1167 session = nfs4_alloc_session(clp);
1171 clp->cl_session = session;
1173 * The create session reply races with the server back
1174 * channel probe. Mark the client NFS_CS_SESSION_INITING
1175 * so that the client back channel can find the
1178 clp->cl_cons_state = NFS_CS_SESSION_INITING;
1180 #endif /* CONFIG_NFS_V4_1 */
1182 return nfs4_init_callback(clp);
1186 * Initialise an NFS4 client record
1188 static int nfs4_init_client(struct nfs_client *clp,
1189 const struct rpc_timeout *timeparms,
1190 const char *ip_addr,
1191 rpc_authflavor_t authflavour,
1196 if (clp->cl_cons_state == NFS_CS_READY) {
1197 /* the client is initialised already */
1198 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1202 /* Check NFS protocol revision and initialize RPC op vector */
1203 clp->rpc_ops = &nfs_v4_clientops;
1205 error = nfs_create_rpc_client(clp, timeparms, authflavour,
1206 1, flags & NFS_MOUNT_NORESVPORT);
1209 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1211 error = nfs_idmap_new(clp);
1213 dprintk("%s: failed to create idmapper. Error = %d\n",
1217 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1219 error = nfs4_init_client_minor_version(clp);
1223 if (!nfs4_has_session(clp))
1224 nfs_mark_client_ready(clp, NFS_CS_READY);
1228 nfs_mark_client_ready(clp, error);
1229 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1234 * Set up an NFS4 client
1236 static int nfs4_set_client(struct nfs_server *server,
1237 const char *hostname,
1238 const struct sockaddr *addr,
1239 const size_t addrlen,
1240 const char *ip_addr,
1241 rpc_authflavor_t authflavour,
1242 int proto, const struct rpc_timeout *timeparms,
1245 struct nfs_client_initdata cl_init = {
1246 .hostname = hostname,
1249 .rpc_ops = &nfs_v4_clientops,
1251 .minorversion = minorversion,
1253 struct nfs_client *clp;
1256 dprintk("--> nfs4_set_client()\n");
1258 /* Allocate or find a client reference we can use */
1259 clp = nfs_get_client(&cl_init);
1261 error = PTR_ERR(clp);
1264 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
1269 server->nfs_client = clp;
1270 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1274 nfs_put_client(clp);
1276 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1282 * Session has been established, and the client marked ready.
1283 * Set the mount rsize and wsize with negotiated fore channel
1284 * attributes which will be bound checked in nfs_server_set_fsinfo.
1286 static void nfs4_session_set_rwsize(struct nfs_server *server)
1288 #ifdef CONFIG_NFS_V4_1
1289 struct nfs4_session *sess;
1293 if (!nfs4_has_session(server->nfs_client))
1295 sess = server->nfs_client->cl_session;
1296 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1297 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1299 if (server->rsize > server_resp_sz)
1300 server->rsize = server_resp_sz;
1301 if (server->wsize > server_rqst_sz)
1302 server->wsize = server_rqst_sz;
1303 #endif /* CONFIG_NFS_V4_1 */
1306 static int nfs4_server_common_setup(struct nfs_server *server,
1307 struct nfs_fh *mntfh)
1309 struct nfs_fattr *fattr;
1312 BUG_ON(!server->nfs_client);
1313 BUG_ON(!server->nfs_client->rpc_ops);
1314 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1316 fattr = nfs_alloc_fattr();
1320 /* We must ensure the session is initialised first */
1321 error = nfs4_init_session(server);
1325 /* Probe the root fh to retrieve its FSID and filehandle */
1326 error = nfs4_get_rootfh(server, mntfh);
1330 dprintk("Server FSID: %llx:%llx\n",
1331 (unsigned long long) server->fsid.major,
1332 (unsigned long long) server->fsid.minor);
1333 dprintk("Mount FH: %d\n", mntfh->size);
1335 nfs4_session_set_rwsize(server);
1337 error = nfs_probe_fsinfo(server, mntfh, fattr);
1341 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1342 server->namelen = NFS4_MAXNAMLEN;
1344 spin_lock(&nfs_client_lock);
1345 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1346 list_add_tail(&server->master_link, &nfs_volume_list);
1347 spin_unlock(&nfs_client_lock);
1349 server->mount_time = jiffies;
1351 nfs_free_fattr(fattr);
1356 * Create a version 4 volume record
1358 static int nfs4_init_server(struct nfs_server *server,
1359 const struct nfs_parsed_mount_data *data)
1361 struct rpc_timeout timeparms;
1364 dprintk("--> nfs4_init_server()\n");
1366 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1367 data->timeo, data->retrans);
1369 /* Initialise the client representation from the mount data */
1370 server->flags = data->flags;
1371 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
1372 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1373 server->caps |= NFS_CAP_READDIRPLUS;
1374 server->options = data->options;
1376 /* Get a client record */
1377 error = nfs4_set_client(server,
1378 data->nfs_server.hostname,
1379 (const struct sockaddr *)&data->nfs_server.address,
1380 data->nfs_server.addrlen,
1381 data->client_address,
1382 data->auth_flavors[0],
1383 data->nfs_server.protocol,
1385 data->minorversion);
1390 server->rsize = nfs_block_size(data->rsize, NULL);
1392 server->wsize = nfs_block_size(data->wsize, NULL);
1394 server->acregmin = data->acregmin * HZ;
1395 server->acregmax = data->acregmax * HZ;
1396 server->acdirmin = data->acdirmin * HZ;
1397 server->acdirmax = data->acdirmax * HZ;
1399 server->port = data->nfs_server.port;
1401 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1405 dprintk("<-- nfs4_init_server() = %d\n", error);
1410 * Create a version 4 volume record
1411 * - keyed on server and FSID
1413 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1414 struct nfs_fh *mntfh)
1416 struct nfs_server *server;
1419 dprintk("--> nfs4_create_server()\n");
1421 server = nfs_alloc_server();
1423 return ERR_PTR(-ENOMEM);
1425 /* set up the general RPC client */
1426 error = nfs4_init_server(server, data);
1430 error = nfs4_server_common_setup(server, mntfh);
1434 dprintk("<-- nfs4_create_server() = %p\n", server);
1438 nfs_free_server(server);
1439 dprintk("<-- nfs4_create_server() = error %d\n", error);
1440 return ERR_PTR(error);
1444 * Create an NFS4 referral server record
1446 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1447 struct nfs_fh *mntfh)
1449 struct nfs_client *parent_client;
1450 struct nfs_server *server, *parent_server;
1453 dprintk("--> nfs4_create_referral_server()\n");
1455 server = nfs_alloc_server();
1457 return ERR_PTR(-ENOMEM);
1459 parent_server = NFS_SB(data->sb);
1460 parent_client = parent_server->nfs_client;
1462 /* Initialise the client representation from the parent server */
1463 nfs_server_copy_userdata(server, parent_server);
1464 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1466 /* Get a client representation.
1467 * Note: NFSv4 always uses TCP, */
1468 error = nfs4_set_client(server, data->hostname,
1471 parent_client->cl_ipaddr,
1473 parent_server->client->cl_xprt->prot,
1474 parent_server->client->cl_timeout,
1475 parent_client->cl_mvops->minor_version);
1479 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1483 error = nfs4_server_common_setup(server, mntfh);
1487 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1491 nfs_free_server(server);
1492 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1493 return ERR_PTR(error);
1496 #endif /* CONFIG_NFS_V4 */
1499 * Clone an NFS2, NFS3 or NFS4 server record
1501 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1503 struct nfs_fattr *fattr)
1505 struct nfs_server *server;
1506 struct nfs_fattr *fattr_fsinfo;
1509 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1510 (unsigned long long) fattr->fsid.major,
1511 (unsigned long long) fattr->fsid.minor);
1513 server = nfs_alloc_server();
1515 return ERR_PTR(-ENOMEM);
1518 fattr_fsinfo = nfs_alloc_fattr();
1519 if (fattr_fsinfo == NULL)
1520 goto out_free_server;
1522 /* Copy data from the source */
1523 server->nfs_client = source->nfs_client;
1524 atomic_inc(&server->nfs_client->cl_count);
1525 nfs_server_copy_userdata(server, source);
1527 server->fsid = fattr->fsid;
1529 error = nfs_init_server_rpcclient(server,
1530 source->client->cl_timeout,
1531 source->client->cl_auth->au_flavor);
1533 goto out_free_server;
1534 if (!IS_ERR(source->client_acl))
1535 nfs_init_server_aclclient(server);
1537 /* probe the filesystem info for this server filesystem */
1538 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1540 goto out_free_server;
1542 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1543 server->namelen = NFS4_MAXNAMLEN;
1545 dprintk("Cloned FSID: %llx:%llx\n",
1546 (unsigned long long) server->fsid.major,
1547 (unsigned long long) server->fsid.minor);
1549 error = nfs_start_lockd(server);
1551 goto out_free_server;
1553 spin_lock(&nfs_client_lock);
1554 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1555 list_add_tail(&server->master_link, &nfs_volume_list);
1556 spin_unlock(&nfs_client_lock);
1558 server->mount_time = jiffies;
1560 nfs_free_fattr(fattr_fsinfo);
1561 dprintk("<-- nfs_clone_server() = %p\n", server);
1565 nfs_free_fattr(fattr_fsinfo);
1566 nfs_free_server(server);
1567 dprintk("<-- nfs_clone_server() = error %d\n", error);
1568 return ERR_PTR(error);
1571 #ifdef CONFIG_PROC_FS
1572 static struct proc_dir_entry *proc_fs_nfs;
1574 static int nfs_server_list_open(struct inode *inode, struct file *file);
1575 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1576 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1577 static void nfs_server_list_stop(struct seq_file *p, void *v);
1578 static int nfs_server_list_show(struct seq_file *m, void *v);
1580 static const struct seq_operations nfs_server_list_ops = {
1581 .start = nfs_server_list_start,
1582 .next = nfs_server_list_next,
1583 .stop = nfs_server_list_stop,
1584 .show = nfs_server_list_show,
1587 static const struct file_operations nfs_server_list_fops = {
1588 .open = nfs_server_list_open,
1590 .llseek = seq_lseek,
1591 .release = seq_release,
1592 .owner = THIS_MODULE,
1595 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1596 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1597 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1598 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1599 static int nfs_volume_list_show(struct seq_file *m, void *v);
1601 static const struct seq_operations nfs_volume_list_ops = {
1602 .start = nfs_volume_list_start,
1603 .next = nfs_volume_list_next,
1604 .stop = nfs_volume_list_stop,
1605 .show = nfs_volume_list_show,
1608 static const struct file_operations nfs_volume_list_fops = {
1609 .open = nfs_volume_list_open,
1611 .llseek = seq_lseek,
1612 .release = seq_release,
1613 .owner = THIS_MODULE,
1617 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1620 static int nfs_server_list_open(struct inode *inode, struct file *file)
1625 ret = seq_open(file, &nfs_server_list_ops);
1629 m = file->private_data;
1630 m->private = PDE(inode)->data;
1636 * set up the iterator to start reading from the server list and return the first item
1638 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1640 /* lock the list against modification */
1641 spin_lock(&nfs_client_lock);
1642 return seq_list_start_head(&nfs_client_list, *_pos);
1646 * move to next server
1648 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1650 return seq_list_next(v, &nfs_client_list, pos);
1654 * clean up after reading from the transports list
1656 static void nfs_server_list_stop(struct seq_file *p, void *v)
1658 spin_unlock(&nfs_client_lock);
1662 * display a header line followed by a load of call lines
1664 static int nfs_server_list_show(struct seq_file *m, void *v)
1666 struct nfs_client *clp;
1668 /* display header on line 1 */
1669 if (v == &nfs_client_list) {
1670 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1674 /* display one transport per line on subsequent lines */
1675 clp = list_entry(v, struct nfs_client, cl_share_link);
1677 seq_printf(m, "v%u %s %s %3d %s\n",
1678 clp->rpc_ops->version,
1679 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1680 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1681 atomic_read(&clp->cl_count),
1688 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1690 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1695 ret = seq_open(file, &nfs_volume_list_ops);
1699 m = file->private_data;
1700 m->private = PDE(inode)->data;
1706 * set up the iterator to start reading from the volume list and return the first item
1708 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1710 /* lock the list against modification */
1711 spin_lock(&nfs_client_lock);
1712 return seq_list_start_head(&nfs_volume_list, *_pos);
1716 * move to next volume
1718 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1720 return seq_list_next(v, &nfs_volume_list, pos);
1724 * clean up after reading from the transports list
1726 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1728 spin_unlock(&nfs_client_lock);
1732 * display a header line followed by a load of call lines
1734 static int nfs_volume_list_show(struct seq_file *m, void *v)
1736 struct nfs_server *server;
1737 struct nfs_client *clp;
1738 char dev[8], fsid[17];
1740 /* display header on line 1 */
1741 if (v == &nfs_volume_list) {
1742 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
1745 /* display one transport per line on subsequent lines */
1746 server = list_entry(v, struct nfs_server, master_link);
1747 clp = server->nfs_client;
1749 snprintf(dev, 8, "%u:%u",
1750 MAJOR(server->s_dev), MINOR(server->s_dev));
1752 snprintf(fsid, 17, "%llx:%llx",
1753 (unsigned long long) server->fsid.major,
1754 (unsigned long long) server->fsid.minor);
1756 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1757 clp->rpc_ops->version,
1758 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1759 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1762 nfs_server_fscache_state(server));
1768 * initialise the /proc/fs/nfsfs/ directory
1770 int __init nfs_fs_proc_init(void)
1772 struct proc_dir_entry *p;
1774 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1778 /* a file of servers with which we're dealing */
1779 p = proc_create("servers", S_IFREG|S_IRUGO,
1780 proc_fs_nfs, &nfs_server_list_fops);
1784 /* a file of volumes that we have mounted */
1785 p = proc_create("volumes", S_IFREG|S_IRUGO,
1786 proc_fs_nfs, &nfs_volume_list_fops);
1792 remove_proc_entry("servers", proc_fs_nfs);
1794 remove_proc_entry("fs/nfsfs", NULL);
1800 * clean up the /proc/fs/nfsfs/ directory
1802 void nfs_fs_proc_exit(void)
1804 remove_proc_entry("volumes", proc_fs_nfs);
1805 remove_proc_entry("servers", proc_fs_nfs);
1806 remove_proc_entry("fs/nfsfs", NULL);
1809 #endif /* CONFIG_PROC_FS */