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);
60 static DEFINE_IDR(cb_ident_idr); /* Protected by nfs_client_lock */
63 * Get a unique NFSv4.0 callback identifier which will be used
64 * by the V4.0 callback service to lookup the nfs_client struct
66 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
70 if (clp->rpc_ops->version != 4 || minorversion != 0)
73 if (!idr_pre_get(&cb_ident_idr, GFP_KERNEL))
75 spin_lock(&nfs_client_lock);
76 ret = idr_get_new(&cb_ident_idr, clp, &clp->cl_cb_ident);
77 spin_unlock(&nfs_client_lock);
82 #endif /* CONFIG_NFS_V4 */
87 static struct rpc_version *nfs_version[5] = {
97 struct rpc_program nfs_program = {
99 .number = NFS_PROGRAM,
100 .nrvers = ARRAY_SIZE(nfs_version),
101 .version = nfs_version,
102 .stats = &nfs_rpcstat,
103 .pipe_dir_name = "/nfs",
106 struct rpc_stat nfs_rpcstat = {
107 .program = &nfs_program
111 #ifdef CONFIG_NFS_V3_ACL
112 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
113 static struct rpc_version * nfsacl_version[] = {
114 [3] = &nfsacl_version3,
117 struct rpc_program nfsacl_program = {
119 .number = NFS_ACL_PROGRAM,
120 .nrvers = ARRAY_SIZE(nfsacl_version),
121 .version = nfsacl_version,
122 .stats = &nfsacl_rpcstat,
124 #endif /* CONFIG_NFS_V3_ACL */
126 struct nfs_client_initdata {
127 const char *hostname;
128 const struct sockaddr *addr;
130 const struct nfs_rpc_ops *rpc_ops;
136 * Allocate a shared client record
138 * Since these are allocated/deallocated very rarely, we don't
139 * bother putting them in a slab cache...
141 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
143 struct nfs_client *clp;
144 struct rpc_cred *cred;
147 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
150 clp->rpc_ops = cl_init->rpc_ops;
152 atomic_set(&clp->cl_count, 1);
153 clp->cl_cons_state = NFS_CS_INITING;
155 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
156 clp->cl_addrlen = cl_init->addrlen;
158 if (cl_init->hostname) {
160 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
161 if (!clp->cl_hostname)
165 INIT_LIST_HEAD(&clp->cl_superblocks);
166 clp->cl_rpcclient = ERR_PTR(-EINVAL);
168 clp->cl_proto = cl_init->proto;
171 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
175 INIT_LIST_HEAD(&clp->cl_delegations);
176 spin_lock_init(&clp->cl_lock);
177 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
178 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
179 clp->cl_boot_time = CURRENT_TIME;
180 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
181 clp->cl_minorversion = cl_init->minorversion;
182 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
184 cred = rpc_lookup_machine_cred();
186 clp->cl_machine_cred = cred;
187 #if defined(CONFIG_NFS_V4_1)
188 INIT_LIST_HEAD(&clp->cl_layouts);
190 nfs_fscache_get_client_cookie(clp);
201 #ifdef CONFIG_NFS_V4_1
202 static void nfs4_shutdown_session(struct nfs_client *clp)
204 if (nfs4_has_session(clp))
205 nfs4_destroy_session(clp->cl_session);
207 #else /* CONFIG_NFS_V4_1 */
208 static void nfs4_shutdown_session(struct nfs_client *clp)
211 #endif /* CONFIG_NFS_V4_1 */
214 * Destroy the NFS4 callback service
216 static void nfs4_destroy_callback(struct nfs_client *clp)
218 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
219 nfs_callback_down(clp->cl_mvops->minor_version);
222 static void nfs4_shutdown_client(struct nfs_client *clp)
224 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
225 nfs4_kill_renewd(clp);
226 nfs4_shutdown_session(clp);
227 nfs4_destroy_callback(clp);
228 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
229 nfs_idmap_delete(clp);
231 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
234 /* idr_remove_all is not needed as all id's are removed by nfs_put_client */
235 void nfs_cleanup_cb_ident_idr(void)
237 idr_destroy(&cb_ident_idr);
240 /* nfs_client_lock held */
241 static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
243 if (clp->cl_cb_ident)
244 idr_remove(&cb_ident_idr, clp->cl_cb_ident);
248 static void nfs4_shutdown_client(struct nfs_client *clp)
252 void nfs_cleanup_cb_ident_idr(void)
256 static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
259 #endif /* CONFIG_NFS_V4 */
262 * Destroy a shared client record
264 static void nfs_free_client(struct nfs_client *clp)
266 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
268 nfs4_shutdown_client(clp);
270 nfs_fscache_release_client_cookie(clp);
272 /* -EIO all pending I/O */
273 if (!IS_ERR(clp->cl_rpcclient))
274 rpc_shutdown_client(clp->cl_rpcclient);
276 if (clp->cl_machine_cred != NULL)
277 put_rpccred(clp->cl_machine_cred);
279 kfree(clp->cl_hostname);
282 dprintk("<-- nfs_free_client()\n");
286 * Release a reference to a shared client record
288 void nfs_put_client(struct nfs_client *clp)
293 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
295 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
296 list_del(&clp->cl_share_link);
297 nfs_cb_idr_remove_locked(clp);
298 spin_unlock(&nfs_client_lock);
300 BUG_ON(!list_empty(&clp->cl_superblocks));
302 nfs_free_client(clp);
305 EXPORT_SYMBOL_GPL(nfs_put_client);
307 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
309 * Test if two ip6 socket addresses refer to the same socket by
310 * comparing relevant fields. The padding bytes specifically, are not
311 * compared. sin6_flowinfo is not compared because it only affects QoS
312 * and sin6_scope_id is only compared if the address is "link local"
313 * because "link local" addresses need only be unique to a specific
314 * link. Conversely, ordinary unicast addresses might have different
317 * The caller should ensure both socket addresses are AF_INET6.
319 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
320 const struct sockaddr *sa2)
322 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
323 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
325 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
326 sin1->sin6_scope_id != sin2->sin6_scope_id)
329 return ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr);
331 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
332 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
333 const struct sockaddr *sa2)
340 * Test if two ip4 socket addresses refer to the same socket, by
341 * comparing relevant fields. The padding bytes specifically, are
344 * The caller should ensure both socket addresses are AF_INET.
346 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
347 const struct sockaddr *sa2)
349 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
350 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
352 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
355 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
356 const struct sockaddr *sa2)
358 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
359 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
361 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
362 (sin1->sin6_port == sin2->sin6_port);
365 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
366 const struct sockaddr *sa2)
368 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
369 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
371 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
372 (sin1->sin_port == sin2->sin_port);
376 * Test if two socket addresses represent the same actual socket,
377 * by comparing (only) relevant fields, excluding the port number.
379 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
380 const struct sockaddr *sa2)
382 if (sa1->sa_family != sa2->sa_family)
385 switch (sa1->sa_family) {
387 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
389 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
395 * Test if two socket addresses represent the same actual socket,
396 * by comparing (only) relevant fields, including the port number.
398 static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
399 const struct sockaddr *sa2)
401 if (sa1->sa_family != sa2->sa_family)
404 switch (sa1->sa_family) {
406 return nfs_sockaddr_cmp_ip4(sa1, sa2);
408 return nfs_sockaddr_cmp_ip6(sa1, sa2);
413 /* Common match routine for v4.0 and v4.1 callback services */
415 nfs4_cb_match_client(const struct sockaddr *addr, struct nfs_client *clp,
418 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
420 /* Don't match clients that failed to initialise */
421 if (!(clp->cl_cons_state == NFS_CS_READY ||
422 clp->cl_cons_state == NFS_CS_SESSION_INITING))
425 /* Match the version and minorversion */
426 if (clp->rpc_ops->version != 4 ||
427 clp->cl_minorversion != minorversion)
430 /* Match only the IP address, not the port number */
431 if (!nfs_sockaddr_match_ipaddr(addr, clap))
438 * Find an nfs_client on the list that matches the initialisation data
441 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
443 struct nfs_client *clp;
444 const struct sockaddr *sap = data->addr;
446 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
447 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
448 /* Don't match clients that failed to initialise properly */
449 if (clp->cl_cons_state < 0)
452 /* Different NFS versions cannot share the same nfs_client */
453 if (clp->rpc_ops != data->rpc_ops)
456 if (clp->cl_proto != data->proto)
458 /* Match nfsv4 minorversion */
459 if (clp->cl_minorversion != data->minorversion)
461 /* Match the full socket address */
462 if (!nfs_sockaddr_cmp(sap, clap))
465 atomic_inc(&clp->cl_count);
472 * Look up a client by IP address and protocol version
473 * - creates a new record if one doesn't yet exist
475 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
477 struct nfs_client *clp, *new = NULL;
480 dprintk("--> nfs_get_client(%s,v%u)\n",
481 cl_init->hostname ?: "", cl_init->rpc_ops->version);
483 /* see if the client already exists */
485 spin_lock(&nfs_client_lock);
487 clp = nfs_match_client(cl_init);
493 spin_unlock(&nfs_client_lock);
495 new = nfs_alloc_client(cl_init);
496 } while (!IS_ERR(new));
498 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
501 /* install a new client and return with it unready */
504 list_add(&clp->cl_share_link, &nfs_client_list);
505 spin_unlock(&nfs_client_lock);
506 dprintk("--> nfs_get_client() = %p [new]\n", clp);
509 /* found an existing client
510 * - make sure it's ready before returning
513 spin_unlock(&nfs_client_lock);
516 nfs_free_client(new);
518 error = wait_event_killable(nfs_client_active_wq,
519 clp->cl_cons_state < NFS_CS_INITING);
522 return ERR_PTR(-ERESTARTSYS);
525 if (clp->cl_cons_state < NFS_CS_READY) {
526 error = clp->cl_cons_state;
528 return ERR_PTR(error);
531 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
533 dprintk("--> nfs_get_client() = %p [share]\n", clp);
538 * Mark a server as ready or failed
540 void nfs_mark_client_ready(struct nfs_client *clp, int state)
542 clp->cl_cons_state = state;
543 wake_up_all(&nfs_client_active_wq);
547 * With sessions, the client is not marked ready until after a
548 * successful EXCHANGE_ID and CREATE_SESSION.
550 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
551 * other versions of NFS can be tried.
553 int nfs4_check_client_ready(struct nfs_client *clp)
555 if (!nfs4_has_session(clp))
557 if (clp->cl_cons_state < NFS_CS_READY)
558 return -EPROTONOSUPPORT;
563 * Initialise the timeout values for a connection
565 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
566 unsigned int timeo, unsigned int retrans)
568 to->to_initval = timeo * HZ / 10;
569 to->to_retries = retrans;
572 case XPRT_TRANSPORT_TCP:
573 case XPRT_TRANSPORT_RDMA:
574 if (to->to_retries == 0)
575 to->to_retries = NFS_DEF_TCP_RETRANS;
576 if (to->to_initval == 0)
577 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
578 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
579 to->to_initval = NFS_MAX_TCP_TIMEOUT;
580 to->to_increment = to->to_initval;
581 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
582 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
583 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
584 if (to->to_maxval < to->to_initval)
585 to->to_maxval = to->to_initval;
586 to->to_exponential = 0;
588 case XPRT_TRANSPORT_UDP:
589 if (to->to_retries == 0)
590 to->to_retries = NFS_DEF_UDP_RETRANS;
592 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
593 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
594 to->to_initval = NFS_MAX_UDP_TIMEOUT;
595 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
596 to->to_exponential = 1;
604 * Create an RPC client handle
606 static int nfs_create_rpc_client(struct nfs_client *clp,
607 const struct rpc_timeout *timeparms,
608 rpc_authflavor_t flavor,
609 int discrtry, int noresvport)
611 struct rpc_clnt *clnt = NULL;
612 struct rpc_create_args args = {
614 .protocol = clp->cl_proto,
615 .address = (struct sockaddr *)&clp->cl_addr,
616 .addrsize = clp->cl_addrlen,
617 .timeout = timeparms,
618 .servername = clp->cl_hostname,
619 .program = &nfs_program,
620 .version = clp->rpc_ops->version,
621 .authflavor = flavor,
625 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
627 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
629 if (!IS_ERR(clp->cl_rpcclient))
632 clnt = rpc_create(&args);
634 dprintk("%s: cannot create RPC client. Error = %ld\n",
635 __func__, PTR_ERR(clnt));
636 return PTR_ERR(clnt);
639 clp->cl_rpcclient = clnt;
644 * Version 2 or 3 client destruction
646 static void nfs_destroy_server(struct nfs_server *server)
648 if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) ||
649 !(server->flags & NFS_MOUNT_LOCAL_FCNTL))
650 nlmclnt_done(server->nlm_host);
654 * Version 2 or 3 lockd setup
656 static int nfs_start_lockd(struct nfs_server *server)
658 struct nlm_host *host;
659 struct nfs_client *clp = server->nfs_client;
660 struct nlmclnt_initdata nlm_init = {
661 .hostname = clp->cl_hostname,
662 .address = (struct sockaddr *)&clp->cl_addr,
663 .addrlen = clp->cl_addrlen,
664 .nfs_version = clp->rpc_ops->version,
665 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
669 if (nlm_init.nfs_version > 3)
671 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
672 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
675 switch (clp->cl_proto) {
677 nlm_init.protocol = IPPROTO_TCP;
679 case XPRT_TRANSPORT_UDP:
680 nlm_init.protocol = IPPROTO_UDP;
683 host = nlmclnt_init(&nlm_init);
685 return PTR_ERR(host);
687 server->nlm_host = host;
688 server->destroy = nfs_destroy_server;
693 * Initialise an NFSv3 ACL client connection
695 #ifdef CONFIG_NFS_V3_ACL
696 static void nfs_init_server_aclclient(struct nfs_server *server)
698 if (server->nfs_client->rpc_ops->version != 3)
700 if (server->flags & NFS_MOUNT_NOACL)
703 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
704 if (IS_ERR(server->client_acl))
707 /* No errors! Assume that Sun nfsacls are supported */
708 server->caps |= NFS_CAP_ACLS;
712 server->caps &= ~NFS_CAP_ACLS;
715 static inline void nfs_init_server_aclclient(struct nfs_server *server)
717 server->flags &= ~NFS_MOUNT_NOACL;
718 server->caps &= ~NFS_CAP_ACLS;
723 * Create a general RPC client
725 static int nfs_init_server_rpcclient(struct nfs_server *server,
726 const struct rpc_timeout *timeo,
727 rpc_authflavor_t pseudoflavour)
729 struct nfs_client *clp = server->nfs_client;
731 server->client = rpc_clone_client(clp->cl_rpcclient);
732 if (IS_ERR(server->client)) {
733 dprintk("%s: couldn't create rpc_client!\n", __func__);
734 return PTR_ERR(server->client);
737 memcpy(&server->client->cl_timeout_default,
739 sizeof(server->client->cl_timeout_default));
740 server->client->cl_timeout = &server->client->cl_timeout_default;
742 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
743 struct rpc_auth *auth;
745 auth = rpcauth_create(pseudoflavour, server->client);
747 dprintk("%s: couldn't create credcache!\n", __func__);
748 return PTR_ERR(auth);
751 server->client->cl_softrtry = 0;
752 if (server->flags & NFS_MOUNT_SOFT)
753 server->client->cl_softrtry = 1;
759 * Initialise an NFS2 or NFS3 client
761 static int nfs_init_client(struct nfs_client *clp,
762 const struct rpc_timeout *timeparms,
763 const struct nfs_parsed_mount_data *data)
767 if (clp->cl_cons_state == NFS_CS_READY) {
768 /* the client is already initialised */
769 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
774 * Create a client RPC handle for doing FSSTAT with UNIX auth only
775 * - RFC 2623, sec 2.3.2
777 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
778 0, data->flags & NFS_MOUNT_NORESVPORT);
781 nfs_mark_client_ready(clp, NFS_CS_READY);
785 nfs_mark_client_ready(clp, error);
786 dprintk("<-- nfs_init_client() = xerror %d\n", error);
791 * Create a version 2 or 3 client
793 static int nfs_init_server(struct nfs_server *server,
794 const struct nfs_parsed_mount_data *data)
796 struct nfs_client_initdata cl_init = {
797 .hostname = data->nfs_server.hostname,
798 .addr = (const struct sockaddr *)&data->nfs_server.address,
799 .addrlen = data->nfs_server.addrlen,
800 .rpc_ops = &nfs_v2_clientops,
801 .proto = data->nfs_server.protocol,
803 struct rpc_timeout timeparms;
804 struct nfs_client *clp;
807 dprintk("--> nfs_init_server()\n");
810 if (data->version == 3)
811 cl_init.rpc_ops = &nfs_v3_clientops;
814 /* Allocate or find a client reference we can use */
815 clp = nfs_get_client(&cl_init);
817 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
821 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
822 data->timeo, data->retrans);
823 error = nfs_init_client(clp, &timeparms, data);
827 server->nfs_client = clp;
829 /* Initialise the client representation from the mount data */
830 server->flags = data->flags;
831 server->options = data->options;
832 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
833 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
834 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
837 server->rsize = nfs_block_size(data->rsize, NULL);
839 server->wsize = nfs_block_size(data->wsize, NULL);
841 server->acregmin = data->acregmin * HZ;
842 server->acregmax = data->acregmax * HZ;
843 server->acdirmin = data->acdirmin * HZ;
844 server->acdirmax = data->acdirmax * HZ;
846 /* Start lockd here, before we might error out */
847 error = nfs_start_lockd(server);
851 server->port = data->nfs_server.port;
853 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
857 /* Preserve the values of mount_server-related mount options */
858 if (data->mount_server.addrlen) {
859 memcpy(&server->mountd_address, &data->mount_server.address,
860 data->mount_server.addrlen);
861 server->mountd_addrlen = data->mount_server.addrlen;
863 server->mountd_version = data->mount_server.version;
864 server->mountd_port = data->mount_server.port;
865 server->mountd_protocol = data->mount_server.protocol;
867 server->namelen = data->namlen;
868 /* Create a client RPC handle for the NFSv3 ACL management interface */
869 nfs_init_server_aclclient(server);
870 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
874 server->nfs_client = NULL;
876 dprintk("<-- nfs_init_server() = xerror %d\n", error);
881 * Load up the server record from information gained in an fsinfo record
883 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
885 unsigned long max_rpc_payload;
887 /* Work out a lot of parameters */
888 if (server->rsize == 0)
889 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
890 if (server->wsize == 0)
891 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
893 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
894 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
895 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
896 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
898 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
899 if (server->rsize > max_rpc_payload)
900 server->rsize = max_rpc_payload;
901 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
902 server->rsize = NFS_MAX_FILE_IO_SIZE;
903 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
905 server->backing_dev_info.name = "nfs";
906 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
908 if (server->wsize > max_rpc_payload)
909 server->wsize = max_rpc_payload;
910 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
911 server->wsize = NFS_MAX_FILE_IO_SIZE;
912 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
913 set_pnfs_layoutdriver(server, fsinfo->layouttype);
915 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
917 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
918 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
919 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
920 if (server->dtsize > server->rsize)
921 server->dtsize = server->rsize;
923 if (server->flags & NFS_MOUNT_NOAC) {
924 server->acregmin = server->acregmax = 0;
925 server->acdirmin = server->acdirmax = 0;
928 server->maxfilesize = fsinfo->maxfilesize;
930 server->time_delta = fsinfo->time_delta;
932 /* We're airborne Set socket buffersize */
933 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
937 * Probe filesystem information, including the FSID on v2/v3
939 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
941 struct nfs_fsinfo fsinfo;
942 struct nfs_client *clp = server->nfs_client;
945 dprintk("--> nfs_probe_fsinfo()\n");
947 if (clp->rpc_ops->set_capabilities != NULL) {
948 error = clp->rpc_ops->set_capabilities(server, mntfh);
953 fsinfo.fattr = fattr;
954 fsinfo.layouttype = 0;
955 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
959 nfs_server_set_fsinfo(server, &fsinfo);
961 /* Get some general file system info */
962 if (server->namelen == 0) {
963 struct nfs_pathconf pathinfo;
965 pathinfo.fattr = fattr;
966 nfs_fattr_init(fattr);
968 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
969 server->namelen = pathinfo.max_namelen;
972 dprintk("<-- nfs_probe_fsinfo() = 0\n");
976 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
981 * Copy useful information when duplicating a server record
983 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
985 target->flags = source->flags;
986 target->rsize = source->rsize;
987 target->wsize = source->wsize;
988 target->acregmin = source->acregmin;
989 target->acregmax = source->acregmax;
990 target->acdirmin = source->acdirmin;
991 target->acdirmax = source->acdirmax;
992 target->caps = source->caps;
993 target->options = source->options;
997 * Allocate and initialise a server record
999 static struct nfs_server *nfs_alloc_server(void)
1001 struct nfs_server *server;
1003 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
1007 server->client = server->client_acl = ERR_PTR(-EINVAL);
1009 /* Zero out the NFS state stuff */
1010 INIT_LIST_HEAD(&server->client_link);
1011 INIT_LIST_HEAD(&server->master_link);
1013 atomic_set(&server->active, 0);
1015 server->io_stats = nfs_alloc_iostats();
1016 if (!server->io_stats) {
1021 if (bdi_init(&server->backing_dev_info)) {
1022 nfs_free_iostats(server->io_stats);
1031 * Free up a server record
1033 void nfs_free_server(struct nfs_server *server)
1035 dprintk("--> nfs_free_server()\n");
1037 unset_pnfs_layoutdriver(server);
1038 spin_lock(&nfs_client_lock);
1039 list_del(&server->client_link);
1040 list_del(&server->master_link);
1041 spin_unlock(&nfs_client_lock);
1043 if (server->destroy != NULL)
1044 server->destroy(server);
1046 if (!IS_ERR(server->client_acl))
1047 rpc_shutdown_client(server->client_acl);
1048 if (!IS_ERR(server->client))
1049 rpc_shutdown_client(server->client);
1051 nfs_put_client(server->nfs_client);
1053 nfs_free_iostats(server->io_stats);
1054 bdi_destroy(&server->backing_dev_info);
1056 nfs_release_automount_timer();
1057 dprintk("<-- nfs_free_server()\n");
1061 * Create a version 2 or 3 volume record
1062 * - keyed on server and FSID
1064 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1065 struct nfs_fh *mntfh)
1067 struct nfs_server *server;
1068 struct nfs_fattr *fattr;
1071 server = nfs_alloc_server();
1073 return ERR_PTR(-ENOMEM);
1076 fattr = nfs_alloc_fattr();
1080 /* Get a client representation */
1081 error = nfs_init_server(server, data);
1085 BUG_ON(!server->nfs_client);
1086 BUG_ON(!server->nfs_client->rpc_ops);
1087 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1089 /* Probe the root fh to retrieve its FSID */
1090 error = nfs_probe_fsinfo(server, mntfh, fattr);
1093 if (server->nfs_client->rpc_ops->version == 3) {
1094 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1095 server->namelen = NFS3_MAXNAMLEN;
1096 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1097 server->caps |= NFS_CAP_READDIRPLUS;
1099 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1100 server->namelen = NFS2_MAXNAMLEN;
1103 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1104 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
1106 dprintk("nfs_create_server: getattr error = %d\n", -error);
1110 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1112 dprintk("Server FSID: %llx:%llx\n",
1113 (unsigned long long) server->fsid.major,
1114 (unsigned long long) server->fsid.minor);
1116 spin_lock(&nfs_client_lock);
1117 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1118 list_add_tail(&server->master_link, &nfs_volume_list);
1119 spin_unlock(&nfs_client_lock);
1121 server->mount_time = jiffies;
1122 nfs_free_fattr(fattr);
1126 nfs_free_fattr(fattr);
1127 nfs_free_server(server);
1128 return ERR_PTR(error);
1131 #ifdef CONFIG_NFS_V4
1133 * NFSv4.0 callback thread helper
1135 * Find a client by IP address, protocol version, and minorversion
1137 * Called from the pg_authenticate method. The callback identifier
1138 * is not used as it has not been decoded.
1140 * Returns NULL if no such client
1143 nfs4_find_client_no_ident(const struct sockaddr *addr)
1145 struct nfs_client *clp;
1147 spin_lock(&nfs_client_lock);
1148 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
1149 if (nfs4_cb_match_client(addr, clp, 0) == false)
1151 atomic_inc(&clp->cl_count);
1152 spin_unlock(&nfs_client_lock);
1155 spin_unlock(&nfs_client_lock);
1160 * NFSv4.0 callback thread helper
1162 * Find a client by callback identifier
1165 nfs4_find_client_ident(int cb_ident)
1167 struct nfs_client *clp;
1169 spin_lock(&nfs_client_lock);
1170 clp = idr_find(&cb_ident_idr, cb_ident);
1172 atomic_inc(&clp->cl_count);
1173 spin_unlock(&nfs_client_lock);
1177 #if defined(CONFIG_NFS_V4_1)
1179 * NFSv4.1 callback thread helper
1180 * For CB_COMPOUND calls, find a client by IP address, protocol version,
1181 * minorversion, and sessionID
1183 * CREATE_SESSION triggers a CB_NULL ping from servers. The callback service
1184 * sessionid can only be set after the CREATE_SESSION return, so a CB_NULL
1185 * can arrive before the callback sessionid is set. For CB_NULL calls,
1186 * find a client by IP address protocol version, and minorversion.
1188 * Returns NULL if no such client
1191 nfs4_find_client_sessionid(const struct sockaddr *addr,
1192 struct nfs4_sessionid *sid, int is_cb_compound)
1194 struct nfs_client *clp;
1196 spin_lock(&nfs_client_lock);
1197 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
1198 if (nfs4_cb_match_client(addr, clp, 1) == false)
1201 if (!nfs4_has_session(clp))
1204 /* Match sessionid unless cb_null call*/
1205 if (is_cb_compound && (memcmp(clp->cl_session->sess_id.data,
1206 sid->data, NFS4_MAX_SESSIONID_LEN) != 0))
1209 atomic_inc(&clp->cl_count);
1210 spin_unlock(&nfs_client_lock);
1213 spin_unlock(&nfs_client_lock);
1217 #else /* CONFIG_NFS_V4_1 */
1220 nfs4_find_client_sessionid(const struct sockaddr *addr,
1221 struct nfs4_sessionid *sid, int is_cb_compound)
1225 #endif /* CONFIG_NFS_V4_1 */
1228 * Initialize the NFS4 callback service
1230 static int nfs4_init_callback(struct nfs_client *clp)
1234 if (clp->rpc_ops->version == 4) {
1235 if (nfs4_has_session(clp)) {
1236 error = xprt_setup_backchannel(
1237 clp->cl_rpcclient->cl_xprt,
1238 NFS41_BC_MIN_CALLBACKS);
1243 error = nfs_callback_up(clp->cl_mvops->minor_version,
1244 clp->cl_rpcclient->cl_xprt);
1246 dprintk("%s: failed to start callback. Error = %d\n",
1250 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
1256 * Initialize the minor version specific parts of an NFS4 client record
1258 static int nfs4_init_client_minor_version(struct nfs_client *clp)
1260 #if defined(CONFIG_NFS_V4_1)
1261 if (clp->cl_mvops->minor_version) {
1262 struct nfs4_session *session = NULL;
1264 * Create the session and mark it expired.
1265 * When a SEQUENCE operation encounters the expired session
1266 * it will do session recovery to initialize it.
1268 session = nfs4_alloc_session(clp);
1272 clp->cl_session = session;
1274 * The create session reply races with the server back
1275 * channel probe. Mark the client NFS_CS_SESSION_INITING
1276 * so that the client back channel can find the
1279 clp->cl_cons_state = NFS_CS_SESSION_INITING;
1281 #endif /* CONFIG_NFS_V4_1 */
1283 return nfs4_init_callback(clp);
1287 * Initialise an NFS4 client record
1289 static int nfs4_init_client(struct nfs_client *clp,
1290 const struct rpc_timeout *timeparms,
1291 const char *ip_addr,
1292 rpc_authflavor_t authflavour,
1297 if (clp->cl_cons_state == NFS_CS_READY) {
1298 /* the client is initialised already */
1299 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1303 /* Check NFS protocol revision and initialize RPC op vector */
1304 clp->rpc_ops = &nfs_v4_clientops;
1306 error = nfs_create_rpc_client(clp, timeparms, authflavour,
1307 1, flags & NFS_MOUNT_NORESVPORT);
1310 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1312 error = nfs_idmap_new(clp);
1314 dprintk("%s: failed to create idmapper. Error = %d\n",
1318 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1320 error = nfs4_init_client_minor_version(clp);
1324 if (!nfs4_has_session(clp))
1325 nfs_mark_client_ready(clp, NFS_CS_READY);
1329 nfs_mark_client_ready(clp, error);
1330 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1335 * Set up an NFS4 client
1337 static int nfs4_set_client(struct nfs_server *server,
1338 const char *hostname,
1339 const struct sockaddr *addr,
1340 const size_t addrlen,
1341 const char *ip_addr,
1342 rpc_authflavor_t authflavour,
1343 int proto, const struct rpc_timeout *timeparms,
1346 struct nfs_client_initdata cl_init = {
1347 .hostname = hostname,
1350 .rpc_ops = &nfs_v4_clientops,
1352 .minorversion = minorversion,
1354 struct nfs_client *clp;
1357 dprintk("--> nfs4_set_client()\n");
1359 /* Allocate or find a client reference we can use */
1360 clp = nfs_get_client(&cl_init);
1362 error = PTR_ERR(clp);
1365 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
1370 server->nfs_client = clp;
1371 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1375 nfs_put_client(clp);
1377 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1383 * Session has been established, and the client marked ready.
1384 * Set the mount rsize and wsize with negotiated fore channel
1385 * attributes which will be bound checked in nfs_server_set_fsinfo.
1387 static void nfs4_session_set_rwsize(struct nfs_server *server)
1389 #ifdef CONFIG_NFS_V4_1
1390 struct nfs4_session *sess;
1394 if (!nfs4_has_session(server->nfs_client))
1396 sess = server->nfs_client->cl_session;
1397 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1398 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1400 if (server->rsize > server_resp_sz)
1401 server->rsize = server_resp_sz;
1402 if (server->wsize > server_rqst_sz)
1403 server->wsize = server_rqst_sz;
1404 #endif /* CONFIG_NFS_V4_1 */
1407 static int nfs4_server_common_setup(struct nfs_server *server,
1408 struct nfs_fh *mntfh)
1410 struct nfs_fattr *fattr;
1413 BUG_ON(!server->nfs_client);
1414 BUG_ON(!server->nfs_client->rpc_ops);
1415 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1417 fattr = nfs_alloc_fattr();
1421 /* We must ensure the session is initialised first */
1422 error = nfs4_init_session(server);
1426 /* Probe the root fh to retrieve its FSID and filehandle */
1427 error = nfs4_get_rootfh(server, mntfh);
1431 dprintk("Server FSID: %llx:%llx\n",
1432 (unsigned long long) server->fsid.major,
1433 (unsigned long long) server->fsid.minor);
1434 dprintk("Mount FH: %d\n", mntfh->size);
1436 nfs4_session_set_rwsize(server);
1438 error = nfs_probe_fsinfo(server, mntfh, fattr);
1442 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1443 server->namelen = NFS4_MAXNAMLEN;
1445 spin_lock(&nfs_client_lock);
1446 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1447 list_add_tail(&server->master_link, &nfs_volume_list);
1448 spin_unlock(&nfs_client_lock);
1450 server->mount_time = jiffies;
1452 nfs_free_fattr(fattr);
1457 * Create a version 4 volume record
1459 static int nfs4_init_server(struct nfs_server *server,
1460 const struct nfs_parsed_mount_data *data)
1462 struct rpc_timeout timeparms;
1465 dprintk("--> nfs4_init_server()\n");
1467 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1468 data->timeo, data->retrans);
1470 /* Initialise the client representation from the mount data */
1471 server->flags = data->flags;
1472 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
1473 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1474 server->caps |= NFS_CAP_READDIRPLUS;
1475 server->options = data->options;
1477 /* Get a client record */
1478 error = nfs4_set_client(server,
1479 data->nfs_server.hostname,
1480 (const struct sockaddr *)&data->nfs_server.address,
1481 data->nfs_server.addrlen,
1482 data->client_address,
1483 data->auth_flavors[0],
1484 data->nfs_server.protocol,
1486 data->minorversion);
1491 server->rsize = nfs_block_size(data->rsize, NULL);
1493 server->wsize = nfs_block_size(data->wsize, NULL);
1495 server->acregmin = data->acregmin * HZ;
1496 server->acregmax = data->acregmax * HZ;
1497 server->acdirmin = data->acdirmin * HZ;
1498 server->acdirmax = data->acdirmax * HZ;
1500 server->port = data->nfs_server.port;
1502 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1506 dprintk("<-- nfs4_init_server() = %d\n", error);
1511 * Create a version 4 volume record
1512 * - keyed on server and FSID
1514 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1515 struct nfs_fh *mntfh)
1517 struct nfs_server *server;
1520 dprintk("--> nfs4_create_server()\n");
1522 server = nfs_alloc_server();
1524 return ERR_PTR(-ENOMEM);
1526 /* set up the general RPC client */
1527 error = nfs4_init_server(server, data);
1531 error = nfs4_server_common_setup(server, mntfh);
1535 dprintk("<-- nfs4_create_server() = %p\n", server);
1539 nfs_free_server(server);
1540 dprintk("<-- nfs4_create_server() = error %d\n", error);
1541 return ERR_PTR(error);
1545 * Create an NFS4 referral server record
1547 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1548 struct nfs_fh *mntfh)
1550 struct nfs_client *parent_client;
1551 struct nfs_server *server, *parent_server;
1554 dprintk("--> nfs4_create_referral_server()\n");
1556 server = nfs_alloc_server();
1558 return ERR_PTR(-ENOMEM);
1560 parent_server = NFS_SB(data->sb);
1561 parent_client = parent_server->nfs_client;
1563 /* Initialise the client representation from the parent server */
1564 nfs_server_copy_userdata(server, parent_server);
1565 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1567 /* Get a client representation.
1568 * Note: NFSv4 always uses TCP, */
1569 error = nfs4_set_client(server, data->hostname,
1572 parent_client->cl_ipaddr,
1574 parent_server->client->cl_xprt->prot,
1575 parent_server->client->cl_timeout,
1576 parent_client->cl_mvops->minor_version);
1580 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1584 error = nfs4_server_common_setup(server, mntfh);
1588 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1592 nfs_free_server(server);
1593 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1594 return ERR_PTR(error);
1597 #endif /* CONFIG_NFS_V4 */
1600 * Clone an NFS2, NFS3 or NFS4 server record
1602 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1604 struct nfs_fattr *fattr)
1606 struct nfs_server *server;
1607 struct nfs_fattr *fattr_fsinfo;
1610 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1611 (unsigned long long) fattr->fsid.major,
1612 (unsigned long long) fattr->fsid.minor);
1614 server = nfs_alloc_server();
1616 return ERR_PTR(-ENOMEM);
1619 fattr_fsinfo = nfs_alloc_fattr();
1620 if (fattr_fsinfo == NULL)
1621 goto out_free_server;
1623 /* Copy data from the source */
1624 server->nfs_client = source->nfs_client;
1625 atomic_inc(&server->nfs_client->cl_count);
1626 nfs_server_copy_userdata(server, source);
1628 server->fsid = fattr->fsid;
1630 error = nfs_init_server_rpcclient(server,
1631 source->client->cl_timeout,
1632 source->client->cl_auth->au_flavor);
1634 goto out_free_server;
1635 if (!IS_ERR(source->client_acl))
1636 nfs_init_server_aclclient(server);
1638 /* probe the filesystem info for this server filesystem */
1639 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1641 goto out_free_server;
1643 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1644 server->namelen = NFS4_MAXNAMLEN;
1646 dprintk("Cloned FSID: %llx:%llx\n",
1647 (unsigned long long) server->fsid.major,
1648 (unsigned long long) server->fsid.minor);
1650 error = nfs_start_lockd(server);
1652 goto out_free_server;
1654 spin_lock(&nfs_client_lock);
1655 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1656 list_add_tail(&server->master_link, &nfs_volume_list);
1657 spin_unlock(&nfs_client_lock);
1659 server->mount_time = jiffies;
1661 nfs_free_fattr(fattr_fsinfo);
1662 dprintk("<-- nfs_clone_server() = %p\n", server);
1666 nfs_free_fattr(fattr_fsinfo);
1667 nfs_free_server(server);
1668 dprintk("<-- nfs_clone_server() = error %d\n", error);
1669 return ERR_PTR(error);
1672 #ifdef CONFIG_PROC_FS
1673 static struct proc_dir_entry *proc_fs_nfs;
1675 static int nfs_server_list_open(struct inode *inode, struct file *file);
1676 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1677 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1678 static void nfs_server_list_stop(struct seq_file *p, void *v);
1679 static int nfs_server_list_show(struct seq_file *m, void *v);
1681 static const struct seq_operations nfs_server_list_ops = {
1682 .start = nfs_server_list_start,
1683 .next = nfs_server_list_next,
1684 .stop = nfs_server_list_stop,
1685 .show = nfs_server_list_show,
1688 static const struct file_operations nfs_server_list_fops = {
1689 .open = nfs_server_list_open,
1691 .llseek = seq_lseek,
1692 .release = seq_release,
1693 .owner = THIS_MODULE,
1696 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1697 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1698 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1699 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1700 static int nfs_volume_list_show(struct seq_file *m, void *v);
1702 static const struct seq_operations nfs_volume_list_ops = {
1703 .start = nfs_volume_list_start,
1704 .next = nfs_volume_list_next,
1705 .stop = nfs_volume_list_stop,
1706 .show = nfs_volume_list_show,
1709 static const struct file_operations nfs_volume_list_fops = {
1710 .open = nfs_volume_list_open,
1712 .llseek = seq_lseek,
1713 .release = seq_release,
1714 .owner = THIS_MODULE,
1718 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1721 static int nfs_server_list_open(struct inode *inode, struct file *file)
1726 ret = seq_open(file, &nfs_server_list_ops);
1730 m = file->private_data;
1731 m->private = PDE(inode)->data;
1737 * set up the iterator to start reading from the server list and return the first item
1739 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1741 /* lock the list against modification */
1742 spin_lock(&nfs_client_lock);
1743 return seq_list_start_head(&nfs_client_list, *_pos);
1747 * move to next server
1749 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1751 return seq_list_next(v, &nfs_client_list, pos);
1755 * clean up after reading from the transports list
1757 static void nfs_server_list_stop(struct seq_file *p, void *v)
1759 spin_unlock(&nfs_client_lock);
1763 * display a header line followed by a load of call lines
1765 static int nfs_server_list_show(struct seq_file *m, void *v)
1767 struct nfs_client *clp;
1769 /* display header on line 1 */
1770 if (v == &nfs_client_list) {
1771 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1775 /* display one transport per line on subsequent lines */
1776 clp = list_entry(v, struct nfs_client, cl_share_link);
1778 seq_printf(m, "v%u %s %s %3d %s\n",
1779 clp->rpc_ops->version,
1780 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1781 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1782 atomic_read(&clp->cl_count),
1789 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1791 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1796 ret = seq_open(file, &nfs_volume_list_ops);
1800 m = file->private_data;
1801 m->private = PDE(inode)->data;
1807 * set up the iterator to start reading from the volume list and return the first item
1809 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1811 /* lock the list against modification */
1812 spin_lock(&nfs_client_lock);
1813 return seq_list_start_head(&nfs_volume_list, *_pos);
1817 * move to next volume
1819 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1821 return seq_list_next(v, &nfs_volume_list, pos);
1825 * clean up after reading from the transports list
1827 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1829 spin_unlock(&nfs_client_lock);
1833 * display a header line followed by a load of call lines
1835 static int nfs_volume_list_show(struct seq_file *m, void *v)
1837 struct nfs_server *server;
1838 struct nfs_client *clp;
1839 char dev[8], fsid[17];
1841 /* display header on line 1 */
1842 if (v == &nfs_volume_list) {
1843 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
1846 /* display one transport per line on subsequent lines */
1847 server = list_entry(v, struct nfs_server, master_link);
1848 clp = server->nfs_client;
1850 snprintf(dev, 8, "%u:%u",
1851 MAJOR(server->s_dev), MINOR(server->s_dev));
1853 snprintf(fsid, 17, "%llx:%llx",
1854 (unsigned long long) server->fsid.major,
1855 (unsigned long long) server->fsid.minor);
1857 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1858 clp->rpc_ops->version,
1859 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1860 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1863 nfs_server_fscache_state(server));
1869 * initialise the /proc/fs/nfsfs/ directory
1871 int __init nfs_fs_proc_init(void)
1873 struct proc_dir_entry *p;
1875 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1879 /* a file of servers with which we're dealing */
1880 p = proc_create("servers", S_IFREG|S_IRUGO,
1881 proc_fs_nfs, &nfs_server_list_fops);
1885 /* a file of volumes that we have mounted */
1886 p = proc_create("volumes", S_IFREG|S_IRUGO,
1887 proc_fs_nfs, &nfs_volume_list_fops);
1893 remove_proc_entry("servers", proc_fs_nfs);
1895 remove_proc_entry("fs/nfsfs", NULL);
1901 * clean up the /proc/fs/nfsfs/ directory
1903 void nfs_fs_proc_exit(void)
1905 remove_proc_entry("volumes", proc_fs_nfs);
1906 remove_proc_entry("servers", proc_fs_nfs);
1907 remove_proc_entry("fs/nfsfs", NULL);
1910 #endif /* CONFIG_PROC_FS */