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;
160 nfs_fscache_get_client_cookie(clp);
172 * Clears/puts all minor version specific parts from an nfs_client struct
173 * reverting it to minorversion 0.
175 static void nfs4_clear_client_minor_version(struct nfs_client *clp)
177 #ifdef CONFIG_NFS_V4_1
178 if (nfs4_has_session(clp)) {
179 nfs4_destroy_session(clp->cl_session);
180 clp->cl_session = NULL;
183 clp->cl_mvops = nfs_v4_minor_ops[0];
184 #endif /* CONFIG_NFS_V4_1 */
188 * Destroy the NFS4 callback service
190 static void nfs4_destroy_callback(struct nfs_client *clp)
192 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
193 nfs_callback_down(clp->cl_mvops->minor_version);
196 static void nfs4_shutdown_client(struct nfs_client *clp)
198 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
199 nfs4_kill_renewd(clp);
200 nfs4_clear_client_minor_version(clp);
201 nfs4_destroy_callback(clp);
202 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
203 nfs_idmap_delete(clp);
205 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
208 static void nfs4_shutdown_client(struct nfs_client *clp)
211 #endif /* CONFIG_NFS_V4 */
214 * Destroy a shared client record
216 static void nfs_free_client(struct nfs_client *clp)
218 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
220 nfs4_shutdown_client(clp);
222 nfs_fscache_release_client_cookie(clp);
224 /* -EIO all pending I/O */
225 if (!IS_ERR(clp->cl_rpcclient))
226 rpc_shutdown_client(clp->cl_rpcclient);
228 if (clp->cl_machine_cred != NULL)
229 put_rpccred(clp->cl_machine_cred);
231 kfree(clp->cl_hostname);
234 dprintk("<-- nfs_free_client()\n");
238 * Release a reference to a shared client record
240 void nfs_put_client(struct nfs_client *clp)
245 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
247 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
248 list_del(&clp->cl_share_link);
249 spin_unlock(&nfs_client_lock);
251 BUG_ON(!list_empty(&clp->cl_superblocks));
253 nfs_free_client(clp);
257 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
259 * Test if two ip6 socket addresses refer to the same socket by
260 * comparing relevant fields. The padding bytes specifically, are not
261 * compared. sin6_flowinfo is not compared because it only affects QoS
262 * and sin6_scope_id is only compared if the address is "link local"
263 * because "link local" addresses need only be unique to a specific
264 * link. Conversely, ordinary unicast addresses might have different
267 * The caller should ensure both socket addresses are AF_INET6.
269 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
270 const struct sockaddr *sa2)
272 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
273 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
275 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
276 sin1->sin6_scope_id != sin2->sin6_scope_id)
279 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
281 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
282 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
283 const struct sockaddr *sa2)
290 * Test if two ip4 socket addresses refer to the same socket, by
291 * comparing relevant fields. The padding bytes specifically, are
294 * The caller should ensure both socket addresses are AF_INET.
296 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
297 const struct sockaddr *sa2)
299 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
300 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
302 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
305 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
306 const struct sockaddr *sa2)
308 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
309 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
311 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
312 (sin1->sin6_port == sin2->sin6_port);
315 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
316 const struct sockaddr *sa2)
318 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
319 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
321 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
322 (sin1->sin_port == sin2->sin_port);
326 * Test if two socket addresses represent the same actual socket,
327 * by comparing (only) relevant fields, excluding the port number.
329 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
330 const struct sockaddr *sa2)
332 if (sa1->sa_family != sa2->sa_family)
335 switch (sa1->sa_family) {
337 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
339 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
345 * Test if two socket addresses represent the same actual socket,
346 * by comparing (only) relevant fields, including the port number.
348 static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
349 const struct sockaddr *sa2)
351 if (sa1->sa_family != sa2->sa_family)
354 switch (sa1->sa_family) {
356 return nfs_sockaddr_cmp_ip4(sa1, sa2);
358 return nfs_sockaddr_cmp_ip6(sa1, sa2);
364 * Find a client by IP address and protocol version
365 * - returns NULL if no such client
367 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
369 struct nfs_client *clp;
371 spin_lock(&nfs_client_lock);
372 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
373 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
375 /* Don't match clients that failed to initialise properly */
376 if (!(clp->cl_cons_state == NFS_CS_READY ||
377 clp->cl_cons_state == NFS_CS_SESSION_INITING))
380 /* Different NFS versions cannot share the same nfs_client */
381 if (clp->rpc_ops->version != nfsversion)
384 /* Match only the IP address, not the port number */
385 if (!nfs_sockaddr_match_ipaddr(addr, clap))
388 atomic_inc(&clp->cl_count);
389 spin_unlock(&nfs_client_lock);
392 spin_unlock(&nfs_client_lock);
397 * Find a client by IP address and protocol version
398 * - returns NULL if no such client
400 struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
402 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
403 u32 nfsvers = clp->rpc_ops->version;
405 spin_lock(&nfs_client_lock);
406 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
407 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
409 /* Don't match clients that failed to initialise properly */
410 if (clp->cl_cons_state != NFS_CS_READY)
413 /* Different NFS versions cannot share the same nfs_client */
414 if (clp->rpc_ops->version != nfsvers)
417 /* Match only the IP address, not the port number */
418 if (!nfs_sockaddr_match_ipaddr(sap, clap))
421 atomic_inc(&clp->cl_count);
422 spin_unlock(&nfs_client_lock);
425 spin_unlock(&nfs_client_lock);
430 * Find an nfs_client on the list that matches the initialisation data
433 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
435 struct nfs_client *clp;
436 const struct sockaddr *sap = data->addr;
438 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
439 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
440 /* Don't match clients that failed to initialise properly */
441 if (clp->cl_cons_state < 0)
444 /* Different NFS versions cannot share the same nfs_client */
445 if (clp->rpc_ops != data->rpc_ops)
448 if (clp->cl_proto != data->proto)
450 /* Match nfsv4 minorversion */
451 if (clp->cl_minorversion != data->minorversion)
453 /* Match the full socket address */
454 if (!nfs_sockaddr_cmp(sap, clap))
457 atomic_inc(&clp->cl_count);
464 * Look up a client by IP address and protocol version
465 * - creates a new record if one doesn't yet exist
467 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
469 struct nfs_client *clp, *new = NULL;
472 dprintk("--> nfs_get_client(%s,v%u)\n",
473 cl_init->hostname ?: "", cl_init->rpc_ops->version);
475 /* see if the client already exists */
477 spin_lock(&nfs_client_lock);
479 clp = nfs_match_client(cl_init);
485 spin_unlock(&nfs_client_lock);
487 new = nfs_alloc_client(cl_init);
488 } while (!IS_ERR(new));
490 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
493 /* install a new client and return with it unready */
496 list_add(&clp->cl_share_link, &nfs_client_list);
497 spin_unlock(&nfs_client_lock);
498 dprintk("--> nfs_get_client() = %p [new]\n", clp);
501 /* found an existing client
502 * - make sure it's ready before returning
505 spin_unlock(&nfs_client_lock);
508 nfs_free_client(new);
510 error = wait_event_killable(nfs_client_active_wq,
511 clp->cl_cons_state < NFS_CS_INITING);
514 return ERR_PTR(-ERESTARTSYS);
517 if (clp->cl_cons_state < NFS_CS_READY) {
518 error = clp->cl_cons_state;
520 return ERR_PTR(error);
523 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
525 dprintk("--> nfs_get_client() = %p [share]\n", clp);
530 * Mark a server as ready or failed
532 void nfs_mark_client_ready(struct nfs_client *clp, int state)
534 clp->cl_cons_state = state;
535 wake_up_all(&nfs_client_active_wq);
539 * With sessions, the client is not marked ready until after a
540 * successful EXCHANGE_ID and CREATE_SESSION.
542 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
543 * other versions of NFS can be tried.
545 int nfs4_check_client_ready(struct nfs_client *clp)
547 if (!nfs4_has_session(clp))
549 if (clp->cl_cons_state < NFS_CS_READY)
550 return -EPROTONOSUPPORT;
555 * Initialise the timeout values for a connection
557 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
558 unsigned int timeo, unsigned int retrans)
560 to->to_initval = timeo * HZ / 10;
561 to->to_retries = retrans;
564 case XPRT_TRANSPORT_TCP:
565 case XPRT_TRANSPORT_RDMA:
566 if (to->to_retries == 0)
567 to->to_retries = NFS_DEF_TCP_RETRANS;
568 if (to->to_initval == 0)
569 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
570 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
571 to->to_initval = NFS_MAX_TCP_TIMEOUT;
572 to->to_increment = to->to_initval;
573 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
574 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
575 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
576 if (to->to_maxval < to->to_initval)
577 to->to_maxval = to->to_initval;
578 to->to_exponential = 0;
580 case XPRT_TRANSPORT_UDP:
581 if (to->to_retries == 0)
582 to->to_retries = NFS_DEF_UDP_RETRANS;
584 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
585 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
586 to->to_initval = NFS_MAX_UDP_TIMEOUT;
587 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
588 to->to_exponential = 1;
596 * Create an RPC client handle
598 static int nfs_create_rpc_client(struct nfs_client *clp,
599 const struct rpc_timeout *timeparms,
600 rpc_authflavor_t flavor,
601 int discrtry, int noresvport)
603 struct rpc_clnt *clnt = NULL;
604 struct rpc_create_args args = {
605 .protocol = clp->cl_proto,
606 .address = (struct sockaddr *)&clp->cl_addr,
607 .addrsize = clp->cl_addrlen,
608 .timeout = timeparms,
609 .servername = clp->cl_hostname,
610 .program = &nfs_program,
611 .version = clp->rpc_ops->version,
612 .authflavor = flavor,
616 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
618 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
620 if (!IS_ERR(clp->cl_rpcclient))
623 clnt = rpc_create(&args);
625 dprintk("%s: cannot create RPC client. Error = %ld\n",
626 __func__, PTR_ERR(clnt));
627 return PTR_ERR(clnt);
630 clp->cl_rpcclient = clnt;
635 * Version 2 or 3 client destruction
637 static void nfs_destroy_server(struct nfs_server *server)
639 if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) ||
640 !(server->flags & NFS_MOUNT_LOCAL_FCNTL))
641 nlmclnt_done(server->nlm_host);
645 * Version 2 or 3 lockd setup
647 static int nfs_start_lockd(struct nfs_server *server)
649 struct nlm_host *host;
650 struct nfs_client *clp = server->nfs_client;
651 struct nlmclnt_initdata nlm_init = {
652 .hostname = clp->cl_hostname,
653 .address = (struct sockaddr *)&clp->cl_addr,
654 .addrlen = clp->cl_addrlen,
655 .nfs_version = clp->rpc_ops->version,
656 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
660 if (nlm_init.nfs_version > 3)
662 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
663 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
666 switch (clp->cl_proto) {
668 nlm_init.protocol = IPPROTO_TCP;
670 case XPRT_TRANSPORT_UDP:
671 nlm_init.protocol = IPPROTO_UDP;
674 host = nlmclnt_init(&nlm_init);
676 return PTR_ERR(host);
678 server->nlm_host = host;
679 server->destroy = nfs_destroy_server;
684 * Initialise an NFSv3 ACL client connection
686 #ifdef CONFIG_NFS_V3_ACL
687 static void nfs_init_server_aclclient(struct nfs_server *server)
689 if (server->nfs_client->rpc_ops->version != 3)
691 if (server->flags & NFS_MOUNT_NOACL)
694 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
695 if (IS_ERR(server->client_acl))
698 /* No errors! Assume that Sun nfsacls are supported */
699 server->caps |= NFS_CAP_ACLS;
703 server->caps &= ~NFS_CAP_ACLS;
706 static inline void nfs_init_server_aclclient(struct nfs_server *server)
708 server->flags &= ~NFS_MOUNT_NOACL;
709 server->caps &= ~NFS_CAP_ACLS;
714 * Create a general RPC client
716 static int nfs_init_server_rpcclient(struct nfs_server *server,
717 const struct rpc_timeout *timeo,
718 rpc_authflavor_t pseudoflavour)
720 struct nfs_client *clp = server->nfs_client;
722 server->client = rpc_clone_client(clp->cl_rpcclient);
723 if (IS_ERR(server->client)) {
724 dprintk("%s: couldn't create rpc_client!\n", __func__);
725 return PTR_ERR(server->client);
728 memcpy(&server->client->cl_timeout_default,
730 sizeof(server->client->cl_timeout_default));
731 server->client->cl_timeout = &server->client->cl_timeout_default;
733 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
734 struct rpc_auth *auth;
736 auth = rpcauth_create(pseudoflavour, server->client);
738 dprintk("%s: couldn't create credcache!\n", __func__);
739 return PTR_ERR(auth);
742 server->client->cl_softrtry = 0;
743 if (server->flags & NFS_MOUNT_SOFT)
744 server->client->cl_softrtry = 1;
750 * Initialise an NFS2 or NFS3 client
752 static int nfs_init_client(struct nfs_client *clp,
753 const struct rpc_timeout *timeparms,
754 const struct nfs_parsed_mount_data *data)
758 if (clp->cl_cons_state == NFS_CS_READY) {
759 /* the client is already initialised */
760 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
765 * Create a client RPC handle for doing FSSTAT with UNIX auth only
766 * - RFC 2623, sec 2.3.2
768 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
769 0, data->flags & NFS_MOUNT_NORESVPORT);
772 nfs_mark_client_ready(clp, NFS_CS_READY);
776 nfs_mark_client_ready(clp, error);
777 dprintk("<-- nfs_init_client() = xerror %d\n", error);
782 * Create a version 2 or 3 client
784 static int nfs_init_server(struct nfs_server *server,
785 const struct nfs_parsed_mount_data *data)
787 struct nfs_client_initdata cl_init = {
788 .hostname = data->nfs_server.hostname,
789 .addr = (const struct sockaddr *)&data->nfs_server.address,
790 .addrlen = data->nfs_server.addrlen,
791 .rpc_ops = &nfs_v2_clientops,
792 .proto = data->nfs_server.protocol,
794 struct rpc_timeout timeparms;
795 struct nfs_client *clp;
798 dprintk("--> nfs_init_server()\n");
801 if (data->version == 3)
802 cl_init.rpc_ops = &nfs_v3_clientops;
805 /* Allocate or find a client reference we can use */
806 clp = nfs_get_client(&cl_init);
808 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
812 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
813 data->timeo, data->retrans);
814 error = nfs_init_client(clp, &timeparms, data);
818 server->nfs_client = clp;
820 /* Initialise the client representation from the mount data */
821 server->flags = data->flags;
822 server->options = data->options;
823 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
824 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
825 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
828 server->rsize = nfs_block_size(data->rsize, NULL);
830 server->wsize = nfs_block_size(data->wsize, NULL);
832 server->acregmin = data->acregmin * HZ;
833 server->acregmax = data->acregmax * HZ;
834 server->acdirmin = data->acdirmin * HZ;
835 server->acdirmax = data->acdirmax * HZ;
837 /* Start lockd here, before we might error out */
838 error = nfs_start_lockd(server);
842 server->port = data->nfs_server.port;
844 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
848 /* Preserve the values of mount_server-related mount options */
849 if (data->mount_server.addrlen) {
850 memcpy(&server->mountd_address, &data->mount_server.address,
851 data->mount_server.addrlen);
852 server->mountd_addrlen = data->mount_server.addrlen;
854 server->mountd_version = data->mount_server.version;
855 server->mountd_port = data->mount_server.port;
856 server->mountd_protocol = data->mount_server.protocol;
858 server->namelen = data->namlen;
859 /* Create a client RPC handle for the NFSv3 ACL management interface */
860 nfs_init_server_aclclient(server);
861 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
865 server->nfs_client = NULL;
867 dprintk("<-- nfs_init_server() = xerror %d\n", error);
872 * Load up the server record from information gained in an fsinfo record
874 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
876 unsigned long max_rpc_payload;
878 /* Work out a lot of parameters */
879 if (server->rsize == 0)
880 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
881 if (server->wsize == 0)
882 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
884 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
885 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
886 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
887 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
889 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
890 if (server->rsize > max_rpc_payload)
891 server->rsize = max_rpc_payload;
892 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
893 server->rsize = NFS_MAX_FILE_IO_SIZE;
894 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
896 server->backing_dev_info.name = "nfs";
897 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
899 if (server->wsize > max_rpc_payload)
900 server->wsize = max_rpc_payload;
901 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
902 server->wsize = NFS_MAX_FILE_IO_SIZE;
903 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
904 set_pnfs_layoutdriver(server, fsinfo->layouttype);
906 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
908 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
909 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
910 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
911 if (server->dtsize > server->rsize)
912 server->dtsize = server->rsize;
914 if (server->flags & NFS_MOUNT_NOAC) {
915 server->acregmin = server->acregmax = 0;
916 server->acdirmin = server->acdirmax = 0;
919 server->maxfilesize = fsinfo->maxfilesize;
921 server->time_delta = fsinfo->time_delta;
923 /* We're airborne Set socket buffersize */
924 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
928 * Probe filesystem information, including the FSID on v2/v3
930 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
932 struct nfs_fsinfo fsinfo;
933 struct nfs_client *clp = server->nfs_client;
936 dprintk("--> nfs_probe_fsinfo()\n");
938 if (clp->rpc_ops->set_capabilities != NULL) {
939 error = clp->rpc_ops->set_capabilities(server, mntfh);
944 fsinfo.fattr = fattr;
945 fsinfo.layouttype = 0;
946 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
950 nfs_server_set_fsinfo(server, &fsinfo);
952 /* Get some general file system info */
953 if (server->namelen == 0) {
954 struct nfs_pathconf pathinfo;
956 pathinfo.fattr = fattr;
957 nfs_fattr_init(fattr);
959 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
960 server->namelen = pathinfo.max_namelen;
963 dprintk("<-- nfs_probe_fsinfo() = 0\n");
967 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
972 * Copy useful information when duplicating a server record
974 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
976 target->flags = source->flags;
977 target->rsize = source->rsize;
978 target->wsize = source->wsize;
979 target->acregmin = source->acregmin;
980 target->acregmax = source->acregmax;
981 target->acdirmin = source->acdirmin;
982 target->acdirmax = source->acdirmax;
983 target->caps = source->caps;
984 target->options = source->options;
988 * Allocate and initialise a server record
990 static struct nfs_server *nfs_alloc_server(void)
992 struct nfs_server *server;
994 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
998 server->client = server->client_acl = ERR_PTR(-EINVAL);
1000 /* Zero out the NFS state stuff */
1001 INIT_LIST_HEAD(&server->client_link);
1002 INIT_LIST_HEAD(&server->master_link);
1004 atomic_set(&server->active, 0);
1006 server->io_stats = nfs_alloc_iostats();
1007 if (!server->io_stats) {
1012 if (bdi_init(&server->backing_dev_info)) {
1013 nfs_free_iostats(server->io_stats);
1022 * Free up a server record
1024 void nfs_free_server(struct nfs_server *server)
1026 dprintk("--> nfs_free_server()\n");
1028 unset_pnfs_layoutdriver(server);
1029 spin_lock(&nfs_client_lock);
1030 list_del(&server->client_link);
1031 list_del(&server->master_link);
1032 spin_unlock(&nfs_client_lock);
1034 if (server->destroy != NULL)
1035 server->destroy(server);
1037 if (!IS_ERR(server->client_acl))
1038 rpc_shutdown_client(server->client_acl);
1039 if (!IS_ERR(server->client))
1040 rpc_shutdown_client(server->client);
1042 nfs_put_client(server->nfs_client);
1044 nfs_free_iostats(server->io_stats);
1045 bdi_destroy(&server->backing_dev_info);
1047 nfs_release_automount_timer();
1048 dprintk("<-- nfs_free_server()\n");
1052 * Create a version 2 or 3 volume record
1053 * - keyed on server and FSID
1055 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1056 struct nfs_fh *mntfh)
1058 struct nfs_server *server;
1059 struct nfs_fattr *fattr;
1062 server = nfs_alloc_server();
1064 return ERR_PTR(-ENOMEM);
1067 fattr = nfs_alloc_fattr();
1071 /* Get a client representation */
1072 error = nfs_init_server(server, data);
1076 BUG_ON(!server->nfs_client);
1077 BUG_ON(!server->nfs_client->rpc_ops);
1078 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1080 /* Probe the root fh to retrieve its FSID */
1081 error = nfs_probe_fsinfo(server, mntfh, fattr);
1084 if (server->nfs_client->rpc_ops->version == 3) {
1085 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1086 server->namelen = NFS3_MAXNAMLEN;
1087 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1088 server->caps |= NFS_CAP_READDIRPLUS;
1090 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1091 server->namelen = NFS2_MAXNAMLEN;
1094 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1095 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
1097 dprintk("nfs_create_server: getattr error = %d\n", -error);
1101 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1103 dprintk("Server FSID: %llx:%llx\n",
1104 (unsigned long long) server->fsid.major,
1105 (unsigned long long) server->fsid.minor);
1107 spin_lock(&nfs_client_lock);
1108 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1109 list_add_tail(&server->master_link, &nfs_volume_list);
1110 spin_unlock(&nfs_client_lock);
1112 server->mount_time = jiffies;
1113 nfs_free_fattr(fattr);
1117 nfs_free_fattr(fattr);
1118 nfs_free_server(server);
1119 return ERR_PTR(error);
1122 #ifdef CONFIG_NFS_V4
1124 * Initialize the NFS4 callback service
1126 static int nfs4_init_callback(struct nfs_client *clp)
1130 if (clp->rpc_ops->version == 4) {
1131 if (nfs4_has_session(clp)) {
1132 error = xprt_setup_backchannel(
1133 clp->cl_rpcclient->cl_xprt,
1134 NFS41_BC_MIN_CALLBACKS);
1139 error = nfs_callback_up(clp->cl_mvops->minor_version,
1140 clp->cl_rpcclient->cl_xprt);
1142 dprintk("%s: failed to start callback. Error = %d\n",
1146 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
1152 * Initialize the minor version specific parts of an NFS4 client record
1154 static int nfs4_init_client_minor_version(struct nfs_client *clp)
1156 #if defined(CONFIG_NFS_V4_1)
1157 if (clp->cl_mvops->minor_version) {
1158 struct nfs4_session *session = NULL;
1160 * Create the session and mark it expired.
1161 * When a SEQUENCE operation encounters the expired session
1162 * it will do session recovery to initialize it.
1164 session = nfs4_alloc_session(clp);
1168 clp->cl_session = session;
1170 * The create session reply races with the server back
1171 * channel probe. Mark the client NFS_CS_SESSION_INITING
1172 * so that the client back channel can find the
1175 clp->cl_cons_state = NFS_CS_SESSION_INITING;
1177 #endif /* CONFIG_NFS_V4_1 */
1179 return nfs4_init_callback(clp);
1183 * Initialise an NFS4 client record
1185 static int nfs4_init_client(struct nfs_client *clp,
1186 const struct rpc_timeout *timeparms,
1187 const char *ip_addr,
1188 rpc_authflavor_t authflavour,
1193 if (clp->cl_cons_state == NFS_CS_READY) {
1194 /* the client is initialised already */
1195 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1199 /* Check NFS protocol revision and initialize RPC op vector */
1200 clp->rpc_ops = &nfs_v4_clientops;
1202 error = nfs_create_rpc_client(clp, timeparms, authflavour,
1203 1, flags & NFS_MOUNT_NORESVPORT);
1206 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1208 error = nfs_idmap_new(clp);
1210 dprintk("%s: failed to create idmapper. Error = %d\n",
1214 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1216 error = nfs4_init_client_minor_version(clp);
1220 if (!nfs4_has_session(clp))
1221 nfs_mark_client_ready(clp, NFS_CS_READY);
1225 nfs_mark_client_ready(clp, error);
1226 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1231 * Set up an NFS4 client
1233 static int nfs4_set_client(struct nfs_server *server,
1234 const char *hostname,
1235 const struct sockaddr *addr,
1236 const size_t addrlen,
1237 const char *ip_addr,
1238 rpc_authflavor_t authflavour,
1239 int proto, const struct rpc_timeout *timeparms,
1242 struct nfs_client_initdata cl_init = {
1243 .hostname = hostname,
1246 .rpc_ops = &nfs_v4_clientops,
1248 .minorversion = minorversion,
1250 struct nfs_client *clp;
1253 dprintk("--> nfs4_set_client()\n");
1255 /* Allocate or find a client reference we can use */
1256 clp = nfs_get_client(&cl_init);
1258 error = PTR_ERR(clp);
1261 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
1266 server->nfs_client = clp;
1267 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1271 nfs_put_client(clp);
1273 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1279 * Session has been established, and the client marked ready.
1280 * Set the mount rsize and wsize with negotiated fore channel
1281 * attributes which will be bound checked in nfs_server_set_fsinfo.
1283 static void nfs4_session_set_rwsize(struct nfs_server *server)
1285 #ifdef CONFIG_NFS_V4_1
1286 struct nfs4_session *sess;
1290 if (!nfs4_has_session(server->nfs_client))
1292 sess = server->nfs_client->cl_session;
1293 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1294 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1296 if (server->rsize > server_resp_sz)
1297 server->rsize = server_resp_sz;
1298 if (server->wsize > server_rqst_sz)
1299 server->wsize = server_rqst_sz;
1300 #endif /* CONFIG_NFS_V4_1 */
1303 static int nfs4_server_common_setup(struct nfs_server *server,
1304 struct nfs_fh *mntfh)
1306 struct nfs_fattr *fattr;
1309 BUG_ON(!server->nfs_client);
1310 BUG_ON(!server->nfs_client->rpc_ops);
1311 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1313 fattr = nfs_alloc_fattr();
1317 /* We must ensure the session is initialised first */
1318 error = nfs4_init_session(server);
1322 /* Probe the root fh to retrieve its FSID and filehandle */
1323 error = nfs4_get_rootfh(server, mntfh);
1327 dprintk("Server FSID: %llx:%llx\n",
1328 (unsigned long long) server->fsid.major,
1329 (unsigned long long) server->fsid.minor);
1330 dprintk("Mount FH: %d\n", mntfh->size);
1332 nfs4_session_set_rwsize(server);
1334 error = nfs_probe_fsinfo(server, mntfh, fattr);
1338 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1339 server->namelen = NFS4_MAXNAMLEN;
1341 spin_lock(&nfs_client_lock);
1342 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1343 list_add_tail(&server->master_link, &nfs_volume_list);
1344 spin_unlock(&nfs_client_lock);
1346 server->mount_time = jiffies;
1348 nfs_free_fattr(fattr);
1353 * Create a version 4 volume record
1355 static int nfs4_init_server(struct nfs_server *server,
1356 const struct nfs_parsed_mount_data *data)
1358 struct rpc_timeout timeparms;
1361 dprintk("--> nfs4_init_server()\n");
1363 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1364 data->timeo, data->retrans);
1366 /* Initialise the client representation from the mount data */
1367 server->flags = data->flags;
1368 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
1369 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1370 server->caps |= NFS_CAP_READDIRPLUS;
1371 server->options = data->options;
1373 /* Get a client record */
1374 error = nfs4_set_client(server,
1375 data->nfs_server.hostname,
1376 (const struct sockaddr *)&data->nfs_server.address,
1377 data->nfs_server.addrlen,
1378 data->client_address,
1379 data->auth_flavors[0],
1380 data->nfs_server.protocol,
1382 data->minorversion);
1387 server->rsize = nfs_block_size(data->rsize, NULL);
1389 server->wsize = nfs_block_size(data->wsize, NULL);
1391 server->acregmin = data->acregmin * HZ;
1392 server->acregmax = data->acregmax * HZ;
1393 server->acdirmin = data->acdirmin * HZ;
1394 server->acdirmax = data->acdirmax * HZ;
1396 server->port = data->nfs_server.port;
1398 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1402 dprintk("<-- nfs4_init_server() = %d\n", error);
1407 * Create a version 4 volume record
1408 * - keyed on server and FSID
1410 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1411 struct nfs_fh *mntfh)
1413 struct nfs_server *server;
1416 dprintk("--> nfs4_create_server()\n");
1418 server = nfs_alloc_server();
1420 return ERR_PTR(-ENOMEM);
1422 /* set up the general RPC client */
1423 error = nfs4_init_server(server, data);
1427 error = nfs4_server_common_setup(server, mntfh);
1431 dprintk("<-- nfs4_create_server() = %p\n", server);
1435 nfs_free_server(server);
1436 dprintk("<-- nfs4_create_server() = error %d\n", error);
1437 return ERR_PTR(error);
1441 * Create an NFS4 referral server record
1443 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1444 struct nfs_fh *mntfh)
1446 struct nfs_client *parent_client;
1447 struct nfs_server *server, *parent_server;
1450 dprintk("--> nfs4_create_referral_server()\n");
1452 server = nfs_alloc_server();
1454 return ERR_PTR(-ENOMEM);
1456 parent_server = NFS_SB(data->sb);
1457 parent_client = parent_server->nfs_client;
1459 /* Initialise the client representation from the parent server */
1460 nfs_server_copy_userdata(server, parent_server);
1461 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1463 /* Get a client representation.
1464 * Note: NFSv4 always uses TCP, */
1465 error = nfs4_set_client(server, data->hostname,
1468 parent_client->cl_ipaddr,
1470 parent_server->client->cl_xprt->prot,
1471 parent_server->client->cl_timeout,
1472 parent_client->cl_mvops->minor_version);
1476 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1480 error = nfs4_server_common_setup(server, mntfh);
1484 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1488 nfs_free_server(server);
1489 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1490 return ERR_PTR(error);
1493 #endif /* CONFIG_NFS_V4 */
1496 * Clone an NFS2, NFS3 or NFS4 server record
1498 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1500 struct nfs_fattr *fattr)
1502 struct nfs_server *server;
1503 struct nfs_fattr *fattr_fsinfo;
1506 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1507 (unsigned long long) fattr->fsid.major,
1508 (unsigned long long) fattr->fsid.minor);
1510 server = nfs_alloc_server();
1512 return ERR_PTR(-ENOMEM);
1515 fattr_fsinfo = nfs_alloc_fattr();
1516 if (fattr_fsinfo == NULL)
1517 goto out_free_server;
1519 /* Copy data from the source */
1520 server->nfs_client = source->nfs_client;
1521 atomic_inc(&server->nfs_client->cl_count);
1522 nfs_server_copy_userdata(server, source);
1524 server->fsid = fattr->fsid;
1526 error = nfs_init_server_rpcclient(server,
1527 source->client->cl_timeout,
1528 source->client->cl_auth->au_flavor);
1530 goto out_free_server;
1531 if (!IS_ERR(source->client_acl))
1532 nfs_init_server_aclclient(server);
1534 /* probe the filesystem info for this server filesystem */
1535 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1537 goto out_free_server;
1539 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1540 server->namelen = NFS4_MAXNAMLEN;
1542 dprintk("Cloned FSID: %llx:%llx\n",
1543 (unsigned long long) server->fsid.major,
1544 (unsigned long long) server->fsid.minor);
1546 error = nfs_start_lockd(server);
1548 goto out_free_server;
1550 spin_lock(&nfs_client_lock);
1551 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1552 list_add_tail(&server->master_link, &nfs_volume_list);
1553 spin_unlock(&nfs_client_lock);
1555 server->mount_time = jiffies;
1557 nfs_free_fattr(fattr_fsinfo);
1558 dprintk("<-- nfs_clone_server() = %p\n", server);
1562 nfs_free_fattr(fattr_fsinfo);
1563 nfs_free_server(server);
1564 dprintk("<-- nfs_clone_server() = error %d\n", error);
1565 return ERR_PTR(error);
1568 #ifdef CONFIG_PROC_FS
1569 static struct proc_dir_entry *proc_fs_nfs;
1571 static int nfs_server_list_open(struct inode *inode, struct file *file);
1572 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1573 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1574 static void nfs_server_list_stop(struct seq_file *p, void *v);
1575 static int nfs_server_list_show(struct seq_file *m, void *v);
1577 static const struct seq_operations nfs_server_list_ops = {
1578 .start = nfs_server_list_start,
1579 .next = nfs_server_list_next,
1580 .stop = nfs_server_list_stop,
1581 .show = nfs_server_list_show,
1584 static const struct file_operations nfs_server_list_fops = {
1585 .open = nfs_server_list_open,
1587 .llseek = seq_lseek,
1588 .release = seq_release,
1589 .owner = THIS_MODULE,
1592 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1593 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1594 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1595 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1596 static int nfs_volume_list_show(struct seq_file *m, void *v);
1598 static const struct seq_operations nfs_volume_list_ops = {
1599 .start = nfs_volume_list_start,
1600 .next = nfs_volume_list_next,
1601 .stop = nfs_volume_list_stop,
1602 .show = nfs_volume_list_show,
1605 static const struct file_operations nfs_volume_list_fops = {
1606 .open = nfs_volume_list_open,
1608 .llseek = seq_lseek,
1609 .release = seq_release,
1610 .owner = THIS_MODULE,
1614 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1617 static int nfs_server_list_open(struct inode *inode, struct file *file)
1622 ret = seq_open(file, &nfs_server_list_ops);
1626 m = file->private_data;
1627 m->private = PDE(inode)->data;
1633 * set up the iterator to start reading from the server list and return the first item
1635 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1637 /* lock the list against modification */
1638 spin_lock(&nfs_client_lock);
1639 return seq_list_start_head(&nfs_client_list, *_pos);
1643 * move to next server
1645 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1647 return seq_list_next(v, &nfs_client_list, pos);
1651 * clean up after reading from the transports list
1653 static void nfs_server_list_stop(struct seq_file *p, void *v)
1655 spin_unlock(&nfs_client_lock);
1659 * display a header line followed by a load of call lines
1661 static int nfs_server_list_show(struct seq_file *m, void *v)
1663 struct nfs_client *clp;
1665 /* display header on line 1 */
1666 if (v == &nfs_client_list) {
1667 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1671 /* display one transport per line on subsequent lines */
1672 clp = list_entry(v, struct nfs_client, cl_share_link);
1674 seq_printf(m, "v%u %s %s %3d %s\n",
1675 clp->rpc_ops->version,
1676 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1677 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1678 atomic_read(&clp->cl_count),
1685 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1687 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1692 ret = seq_open(file, &nfs_volume_list_ops);
1696 m = file->private_data;
1697 m->private = PDE(inode)->data;
1703 * set up the iterator to start reading from the volume list and return the first item
1705 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1707 /* lock the list against modification */
1708 spin_lock(&nfs_client_lock);
1709 return seq_list_start_head(&nfs_volume_list, *_pos);
1713 * move to next volume
1715 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1717 return seq_list_next(v, &nfs_volume_list, pos);
1721 * clean up after reading from the transports list
1723 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1725 spin_unlock(&nfs_client_lock);
1729 * display a header line followed by a load of call lines
1731 static int nfs_volume_list_show(struct seq_file *m, void *v)
1733 struct nfs_server *server;
1734 struct nfs_client *clp;
1735 char dev[8], fsid[17];
1737 /* display header on line 1 */
1738 if (v == &nfs_volume_list) {
1739 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
1742 /* display one transport per line on subsequent lines */
1743 server = list_entry(v, struct nfs_server, master_link);
1744 clp = server->nfs_client;
1746 snprintf(dev, 8, "%u:%u",
1747 MAJOR(server->s_dev), MINOR(server->s_dev));
1749 snprintf(fsid, 17, "%llx:%llx",
1750 (unsigned long long) server->fsid.major,
1751 (unsigned long long) server->fsid.minor);
1753 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1754 clp->rpc_ops->version,
1755 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1756 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1759 nfs_server_fscache_state(server));
1765 * initialise the /proc/fs/nfsfs/ directory
1767 int __init nfs_fs_proc_init(void)
1769 struct proc_dir_entry *p;
1771 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1775 /* a file of servers with which we're dealing */
1776 p = proc_create("servers", S_IFREG|S_IRUGO,
1777 proc_fs_nfs, &nfs_server_list_fops);
1781 /* a file of volumes that we have mounted */
1782 p = proc_create("volumes", S_IFREG|S_IRUGO,
1783 proc_fs_nfs, &nfs_volume_list_fops);
1789 remove_proc_entry("servers", proc_fs_nfs);
1791 remove_proc_entry("fs/nfsfs", NULL);
1797 * clean up the /proc/fs/nfsfs/ directory
1799 void nfs_fs_proc_exit(void)
1801 remove_proc_entry("volumes", proc_fs_nfs);
1802 remove_proc_entry("servers", proc_fs_nfs);
1803 remove_proc_entry("fs/nfsfs", NULL);
1806 #endif /* CONFIG_PROC_FS */