blob: 8d25ccb2d51d514a27a5098cfd13ad872cb46dc8 [file] [log] [blame]
David Howells24c8dbb2006-08-22 20:06:10 -04001/* client.c: NFS client sharing and management code
2 *
3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
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.
10 */
11
12
David Howells24c8dbb2006-08-22 20:06:10 -040013#include <linux/module.h>
14#include <linux/init.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040015#include <linux/sched.h>
David Howells24c8dbb2006-08-22 20:06:10 -040016#include <linux/time.h>
17#include <linux/kernel.h>
18#include <linux/mm.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>
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -040026#include <linux/sunrpc/xprtsock.h>
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -040027#include <linux/sunrpc/xprtrdma.h>
David Howells24c8dbb2006-08-22 20:06:10 -040028#include <linux/nfs_fs.h>
29#include <linux/nfs_mount.h>
30#include <linux/nfs4_mount.h>
31#include <linux/lockd/bind.h>
David Howells24c8dbb2006-08-22 20:06:10 -040032#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>
Trond Myklebust3b0d3f92008-01-03 13:28:58 -050037#include <linux/in6.h>
38#include <net/ipv6.h>
David Howells24c8dbb2006-08-22 20:06:10 -040039#include <linux/nfs_xdr.h>
Andy Adamson0b5b7ae2009-04-01 09:23:15 -040040#include <linux/sunrpc/bc_xprt.h>
David Howells24c8dbb2006-08-22 20:06:10 -040041
42#include <asm/system.h>
43
44#include "nfs4_fs.h"
45#include "callback.h"
46#include "delegation.h"
47#include "iostat.h"
48#include "internal.h"
David Howells14727282009-04-03 16:42:42 +010049#include "fscache.h"
David Howells24c8dbb2006-08-22 20:06:10 -040050
51#define NFSDBG_FACILITY NFSDBG_CLIENT
52
53static DEFINE_SPINLOCK(nfs_client_lock);
54static LIST_HEAD(nfs_client_list);
David Howells54ceac42006-08-22 20:06:13 -040055static LIST_HEAD(nfs_volume_list);
David Howells24c8dbb2006-08-22 20:06:10 -040056static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
57
58/*
David Howells5006a762006-08-22 20:06:12 -040059 * RPC cruft for NFS
60 */
61static struct rpc_version *nfs_version[5] = {
62 [2] = &nfs_version2,
63#ifdef CONFIG_NFS_V3
64 [3] = &nfs_version3,
65#endif
66#ifdef CONFIG_NFS_V4
67 [4] = &nfs_version4,
68#endif
69};
70
71struct rpc_program nfs_program = {
72 .name = "nfs",
73 .number = NFS_PROGRAM,
74 .nrvers = ARRAY_SIZE(nfs_version),
75 .version = nfs_version,
76 .stats = &nfs_rpcstat,
77 .pipe_dir_name = "/nfs",
78};
79
80struct rpc_stat nfs_rpcstat = {
81 .program = &nfs_program
82};
83
84
85#ifdef CONFIG_NFS_V3_ACL
86static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
87static struct rpc_version * nfsacl_version[] = {
88 [3] = &nfsacl_version3,
89};
90
91struct rpc_program nfsacl_program = {
92 .name = "nfsacl",
93 .number = NFS_ACL_PROGRAM,
94 .nrvers = ARRAY_SIZE(nfsacl_version),
95 .version = nfsacl_version,
96 .stats = &nfsacl_rpcstat,
97};
98#endif /* CONFIG_NFS_V3_ACL */
99
Trond Myklebust3a498022007-12-14 14:56:04 -0500100struct nfs_client_initdata {
101 const char *hostname;
Chuck Leverd7422c42007-12-10 14:58:51 -0500102 const struct sockaddr *addr;
Chuck Lever6e4cffd2007-12-10 14:58:15 -0500103 size_t addrlen;
Trond Myklebust40c553192007-12-14 14:56:07 -0500104 const struct nfs_rpc_ops *rpc_ops;
Trond Myklebust59dca3b2008-01-03 16:29:06 -0500105 int proto;
Benny Halevy5aae4a92009-04-01 09:21:50 -0400106 u32 minorversion;
Trond Myklebust3a498022007-12-14 14:56:04 -0500107};
108
David Howells5006a762006-08-22 20:06:12 -0400109/*
David Howells24c8dbb2006-08-22 20:06:10 -0400110 * Allocate a shared client record
111 *
112 * Since these are allocated/deallocated very rarely, we don't
113 * bother putting them in a slab cache...
114 */
Trond Myklebust3a498022007-12-14 14:56:04 -0500115static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
David Howells24c8dbb2006-08-22 20:06:10 -0400116{
117 struct nfs_client *clp;
Trond Myklebust7c67db32008-04-07 20:50:11 -0400118 struct rpc_cred *cred;
Chuck Levera21bdd92009-06-17 18:02:10 -0700119 int err = -ENOMEM;
David Howells24c8dbb2006-08-22 20:06:10 -0400120
121 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
122 goto error_0;
123
Trond Myklebust40c553192007-12-14 14:56:07 -0500124 clp->rpc_ops = cl_init->rpc_ops;
125
David Howells24c8dbb2006-08-22 20:06:10 -0400126 atomic_set(&clp->cl_count, 1);
127 clp->cl_cons_state = NFS_CS_INITING;
128
Chuck Lever6e4cffd2007-12-10 14:58:15 -0500129 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
130 clp->cl_addrlen = cl_init->addrlen;
David Howells24c8dbb2006-08-22 20:06:10 -0400131
Trond Myklebust3a498022007-12-14 14:56:04 -0500132 if (cl_init->hostname) {
Chuck Levera21bdd92009-06-17 18:02:10 -0700133 err = -ENOMEM;
Trond Myklebust3a498022007-12-14 14:56:04 -0500134 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
David Howells24c8dbb2006-08-22 20:06:10 -0400135 if (!clp->cl_hostname)
Benny Halevy71468512009-04-01 09:22:56 -0400136 goto error_cleanup;
David Howells24c8dbb2006-08-22 20:06:10 -0400137 }
138
139 INIT_LIST_HEAD(&clp->cl_superblocks);
140 clp->cl_rpcclient = ERR_PTR(-EINVAL);
141
Trond Myklebust59dca3b2008-01-03 16:29:06 -0500142 clp->cl_proto = cl_init->proto;
143
David Howells24c8dbb2006-08-22 20:06:10 -0400144#ifdef CONFIG_NFS_V4
David Howells24c8dbb2006-08-22 20:06:10 -0400145 INIT_LIST_HEAD(&clp->cl_delegations);
David Howells24c8dbb2006-08-22 20:06:10 -0400146 spin_lock_init(&clp->cl_lock);
David Howells65f27f32006-11-22 14:55:48 +0000147 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
David Howells24c8dbb2006-08-22 20:06:10 -0400148 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
149 clp->cl_boot_time = CURRENT_TIME;
150 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
Benny Halevy5aae4a92009-04-01 09:21:50 -0400151 clp->cl_minorversion = cl_init->minorversion;
David Howells24c8dbb2006-08-22 20:06:10 -0400152#endif
Trond Myklebust7c67db32008-04-07 20:50:11 -0400153 cred = rpc_lookup_machine_cred();
154 if (!IS_ERR(cred))
155 clp->cl_machine_cred = cred;
David Howells24c8dbb2006-08-22 20:06:10 -0400156
David Howells14727282009-04-03 16:42:42 +0100157 nfs_fscache_get_client_cookie(clp);
158
David Howells24c8dbb2006-08-22 20:06:10 -0400159 return clp;
160
Benny Halevy71468512009-04-01 09:22:56 -0400161error_cleanup:
David Howells24c8dbb2006-08-22 20:06:10 -0400162 kfree(clp);
163error_0:
Chuck Levera21bdd92009-06-17 18:02:10 -0700164 return ERR_PTR(err);
David Howells24c8dbb2006-08-22 20:06:10 -0400165}
166
Trond Myklebust5dd31772006-08-24 01:03:05 -0400167static void nfs4_shutdown_client(struct nfs_client *clp)
168{
169#ifdef CONFIG_NFS_V4
170 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
171 nfs4_kill_renewd(clp);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400172 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
Trond Myklebust5dd31772006-08-24 01:03:05 -0400173 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
174 nfs_idmap_delete(clp);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500175
176 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
Trond Myklebust5dd31772006-08-24 01:03:05 -0400177#endif
178}
179
David Howells24c8dbb2006-08-22 20:06:10 -0400180/*
Benny Halevy9bdaa862009-04-01 09:22:55 -0400181 * Destroy the NFS4 callback service
182 */
183static void nfs4_destroy_callback(struct nfs_client *clp)
184{
185#ifdef CONFIG_NFS_V4
186 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
Andy Adamsone82dc222009-04-01 09:23:14 -0400187 nfs_callback_down(clp->cl_minorversion);
Benny Halevy9bdaa862009-04-01 09:22:55 -0400188#endif /* CONFIG_NFS_V4 */
189}
190
191/*
Andy Adamson557134a2009-04-01 09:21:53 -0400192 * Clears/puts all minor version specific parts from an nfs_client struct
193 * reverting it to minorversion 0.
194 */
195static void nfs4_clear_client_minor_version(struct nfs_client *clp)
196{
197#ifdef CONFIG_NFS_V4_1
198 if (nfs4_has_session(clp)) {
199 nfs4_destroy_session(clp->cl_session);
200 clp->cl_session = NULL;
201 }
Andy Adamsoncccef3b2009-04-01 09:22:03 -0400202
203 clp->cl_call_sync = _nfs4_call_sync;
Andy Adamson557134a2009-04-01 09:21:53 -0400204#endif /* CONFIG_NFS_V4_1 */
Benny Halevy71468512009-04-01 09:22:56 -0400205
206 nfs4_destroy_callback(clp);
Andy Adamson557134a2009-04-01 09:21:53 -0400207}
208
209/*
David Howells24c8dbb2006-08-22 20:06:10 -0400210 * Destroy a shared client record
211 */
212static void nfs_free_client(struct nfs_client *clp)
213{
Trond Myklebust40c553192007-12-14 14:56:07 -0500214 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
David Howells24c8dbb2006-08-22 20:06:10 -0400215
Andy Adamson557134a2009-04-01 09:21:53 -0400216 nfs4_clear_client_minor_version(clp);
Trond Myklebust5dd31772006-08-24 01:03:05 -0400217 nfs4_shutdown_client(clp);
David Howells24c8dbb2006-08-22 20:06:10 -0400218
David Howells14727282009-04-03 16:42:42 +0100219 nfs_fscache_release_client_cookie(clp);
220
David Howells24c8dbb2006-08-22 20:06:10 -0400221 /* -EIO all pending I/O */
222 if (!IS_ERR(clp->cl_rpcclient))
223 rpc_shutdown_client(clp->cl_rpcclient);
224
Trond Myklebust7c67db32008-04-07 20:50:11 -0400225 if (clp->cl_machine_cred != NULL)
226 put_rpccred(clp->cl_machine_cred);
227
David Howells24c8dbb2006-08-22 20:06:10 -0400228 kfree(clp->cl_hostname);
229 kfree(clp);
230
231 dprintk("<-- nfs_free_client()\n");
232}
233
234/*
235 * Release a reference to a shared client record
236 */
237void nfs_put_client(struct nfs_client *clp)
238{
David Howells27ba8512006-07-30 14:40:56 -0400239 if (!clp)
240 return;
241
David Howells24c8dbb2006-08-22 20:06:10 -0400242 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
243
244 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
245 list_del(&clp->cl_share_link);
246 spin_unlock(&nfs_client_lock);
247
248 BUG_ON(!list_empty(&clp->cl_superblocks));
249
250 nfs_free_client(clp);
251 }
252}
253
Trond Myklebust9082a5c2008-12-23 15:21:53 -0500254#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
Trond Myklebust9f4c8992009-03-12 14:51:32 -0400255/*
256 * Test if two ip6 socket addresses refer to the same socket by
257 * comparing relevant fields. The padding bytes specifically, are not
258 * compared. sin6_flowinfo is not compared because it only affects QoS
259 * and sin6_scope_id is only compared if the address is "link local"
260 * because "link local" addresses need only be unique to a specific
261 * link. Conversely, ordinary unicast addresses might have different
262 * sin6_scope_id.
263 *
264 * The caller should ensure both socket addresses are AF_INET6.
265 */
Chuck Lever3c8c45d2009-03-18 20:48:14 -0400266static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
267 const struct sockaddr *sa2)
Trond Myklebust9f4c8992009-03-12 14:51:32 -0400268{
Chuck Lever3c8c45d2009-03-18 20:48:14 -0400269 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
270 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
Trond Myklebust9f4c8992009-03-12 14:51:32 -0400271
Chuck Lever3c8c45d2009-03-18 20:48:14 -0400272 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
273 sin1->sin6_scope_id != sin2->sin6_scope_id)
Trond Myklebust9f4c8992009-03-12 14:51:32 -0400274 return 0;
Trond Myklebust3b0d3f92008-01-03 13:28:58 -0500275
Chuck Lever3c8c45d2009-03-18 20:48:14 -0400276 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
Trond Myklebust3b0d3f92008-01-03 13:28:58 -0500277}
Chuck Lever3c8c45d2009-03-18 20:48:14 -0400278#else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
279static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
280 const struct sockaddr *sa2)
Trond Myklebust9f4c8992009-03-12 14:51:32 -0400281{
282 return 0;
283}
Trond Myklebust9082a5c2008-12-23 15:21:53 -0500284#endif
Trond Myklebust3b0d3f92008-01-03 13:28:58 -0500285
David Howells24c8dbb2006-08-22 20:06:10 -0400286/*
Ian Dalld7371c42009-03-10 20:33:22 -0400287 * Test if two ip4 socket addresses refer to the same socket, by
288 * comparing relevant fields. The padding bytes specifically, are
289 * not compared.
290 *
291 * The caller should ensure both socket addresses are AF_INET.
292 */
Chuck Lever3c8c45d2009-03-18 20:48:14 -0400293static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
294 const struct sockaddr *sa2)
295{
296 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
297 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
298
299 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
300}
301
302static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
303 const struct sockaddr *sa2)
304{
305 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
306 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
307
308 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
309 (sin1->sin6_port == sin2->sin6_port);
310}
311
Trond Myklebust9f4c8992009-03-12 14:51:32 -0400312static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
313 const struct sockaddr *sa2)
Ian Dalld7371c42009-03-10 20:33:22 -0400314{
Chuck Lever3c8c45d2009-03-18 20:48:14 -0400315 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
316 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
Trond Myklebust9f4c8992009-03-12 14:51:32 -0400317
Chuck Lever3c8c45d2009-03-18 20:48:14 -0400318 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
319 (sin1->sin_port == sin2->sin_port);
Ian Dalld7371c42009-03-10 20:33:22 -0400320}
321
322/*
Ian Dalld7371c42009-03-10 20:33:22 -0400323 * Test if two socket addresses represent the same actual socket,
Chuck Lever3c8c45d2009-03-18 20:48:14 -0400324 * by comparing (only) relevant fields, excluding the port number.
325 */
326static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
327 const struct sockaddr *sa2)
328{
329 if (sa1->sa_family != sa2->sa_family)
330 return 0;
331
332 switch (sa1->sa_family) {
333 case AF_INET:
334 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
335 case AF_INET6:
336 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
337 }
338 return 0;
339}
340
341/*
342 * Test if two socket addresses represent the same actual socket,
343 * by comparing (only) relevant fields, including the port number.
Ian Dalld7371c42009-03-10 20:33:22 -0400344 */
345static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
346 const struct sockaddr *sa2)
347{
348 if (sa1->sa_family != sa2->sa_family)
349 return 0;
350
351 switch (sa1->sa_family) {
352 case AF_INET:
Trond Myklebust9f4c8992009-03-12 14:51:32 -0400353 return nfs_sockaddr_cmp_ip4(sa1, sa2);
Ian Dalld7371c42009-03-10 20:33:22 -0400354 case AF_INET6:
Trond Myklebust9f4c8992009-03-12 14:51:32 -0400355 return nfs_sockaddr_cmp_ip6(sa1, sa2);
Ian Dalld7371c42009-03-10 20:33:22 -0400356 }
357 return 0;
358}
359
360/*
Trond Myklebustc81468a2007-12-14 14:56:05 -0500361 * Find a client by IP address and protocol version
362 * - returns NULL if no such client
David Howells24c8dbb2006-08-22 20:06:10 -0400363 */
Chuck Leverff052642007-12-10 14:58:44 -0500364struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
Trond Myklebustc81468a2007-12-14 14:56:05 -0500365{
366 struct nfs_client *clp;
367
368 spin_lock(&nfs_client_lock);
369 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
Trond Myklebust3b0d3f92008-01-03 13:28:58 -0500370 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
371
Trond Myklebustc81468a2007-12-14 14:56:05 -0500372 /* Don't match clients that failed to initialise properly */
Andy Adamson76db6d92009-04-01 09:22:38 -0400373 if (!(clp->cl_cons_state == NFS_CS_READY ||
374 clp->cl_cons_state == NFS_CS_SESSION_INITING))
Trond Myklebustc81468a2007-12-14 14:56:05 -0500375 continue;
376
377 /* Different NFS versions cannot share the same nfs_client */
Trond Myklebust40c553192007-12-14 14:56:07 -0500378 if (clp->rpc_ops->version != nfsversion)
Trond Myklebustc81468a2007-12-14 14:56:05 -0500379 continue;
380
381 /* Match only the IP address, not the port number */
Trond Myklebust3b0d3f92008-01-03 13:28:58 -0500382 if (!nfs_sockaddr_match_ipaddr(addr, clap))
Trond Myklebustc81468a2007-12-14 14:56:05 -0500383 continue;
384
385 atomic_inc(&clp->cl_count);
386 spin_unlock(&nfs_client_lock);
387 return clp;
388 }
389 spin_unlock(&nfs_client_lock);
390 return NULL;
391}
392
393/*
Trond Myklebust3fbd67a2008-01-26 01:06:40 -0500394 * Find a client by IP address and protocol version
395 * - returns NULL if no such client
396 */
397struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
398{
399 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
400 u32 nfsvers = clp->rpc_ops->version;
401
402 spin_lock(&nfs_client_lock);
403 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
404 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
405
406 /* Don't match clients that failed to initialise properly */
407 if (clp->cl_cons_state != NFS_CS_READY)
408 continue;
409
410 /* Different NFS versions cannot share the same nfs_client */
411 if (clp->rpc_ops->version != nfsvers)
412 continue;
413
Trond Myklebust3fbd67a2008-01-26 01:06:40 -0500414 /* Match only the IP address, not the port number */
415 if (!nfs_sockaddr_match_ipaddr(sap, clap))
416 continue;
417
418 atomic_inc(&clp->cl_count);
419 spin_unlock(&nfs_client_lock);
420 return clp;
421 }
422 spin_unlock(&nfs_client_lock);
423 return NULL;
424}
425
426/*
Trond Myklebustc81468a2007-12-14 14:56:05 -0500427 * Find an nfs_client on the list that matches the initialisation data
428 * that is supplied.
429 */
430static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
David Howells24c8dbb2006-08-22 20:06:10 -0400431{
432 struct nfs_client *clp;
Ian Dalld7371c42009-03-10 20:33:22 -0400433 const struct sockaddr *sap = data->addr;
David Howells24c8dbb2006-08-22 20:06:10 -0400434
435 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
Ian Dalld7371c42009-03-10 20:33:22 -0400436 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
Trond Myklebust13bbc062006-10-19 23:28:40 -0700437 /* Don't match clients that failed to initialise properly */
438 if (clp->cl_cons_state < 0)
439 continue;
440
David Howells24c8dbb2006-08-22 20:06:10 -0400441 /* Different NFS versions cannot share the same nfs_client */
Trond Myklebust40c553192007-12-14 14:56:07 -0500442 if (clp->rpc_ops != data->rpc_ops)
David Howells24c8dbb2006-08-22 20:06:10 -0400443 continue;
444
Trond Myklebust59dca3b2008-01-03 16:29:06 -0500445 if (clp->cl_proto != data->proto)
446 continue;
Benny Halevy5aae4a92009-04-01 09:21:50 -0400447 /* Match nfsv4 minorversion */
448 if (clp->cl_minorversion != data->minorversion)
449 continue;
Trond Myklebustc81468a2007-12-14 14:56:05 -0500450 /* Match the full socket address */
Ian Dalld7371c42009-03-10 20:33:22 -0400451 if (!nfs_sockaddr_cmp(sap, clap))
David Howells24c8dbb2006-08-22 20:06:10 -0400452 continue;
453
Trond Myklebustc81468a2007-12-14 14:56:05 -0500454 atomic_inc(&clp->cl_count);
455 return clp;
David Howells24c8dbb2006-08-22 20:06:10 -0400456 }
David Howells24c8dbb2006-08-22 20:06:10 -0400457 return NULL;
David Howells24c8dbb2006-08-22 20:06:10 -0400458}
459
460/*
461 * Look up a client by IP address and protocol version
462 * - creates a new record if one doesn't yet exist
463 */
Trond Myklebust3a498022007-12-14 14:56:04 -0500464static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
David Howells24c8dbb2006-08-22 20:06:10 -0400465{
466 struct nfs_client *clp, *new = NULL;
467 int error;
468
Chuck Leverd7422c42007-12-10 14:58:51 -0500469 dprintk("--> nfs_get_client(%s,v%u)\n",
470 cl_init->hostname ?: "", cl_init->rpc_ops->version);
David Howells24c8dbb2006-08-22 20:06:10 -0400471
472 /* see if the client already exists */
473 do {
474 spin_lock(&nfs_client_lock);
475
Trond Myklebustc81468a2007-12-14 14:56:05 -0500476 clp = nfs_match_client(cl_init);
David Howells24c8dbb2006-08-22 20:06:10 -0400477 if (clp)
478 goto found_client;
479 if (new)
480 goto install_client;
481
482 spin_unlock(&nfs_client_lock);
483
Trond Myklebust3a498022007-12-14 14:56:04 -0500484 new = nfs_alloc_client(cl_init);
Chuck Levera21bdd92009-06-17 18:02:10 -0700485 } while (!IS_ERR(new));
David Howells24c8dbb2006-08-22 20:06:10 -0400486
Chuck Levera21bdd92009-06-17 18:02:10 -0700487 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
488 return new;
David Howells24c8dbb2006-08-22 20:06:10 -0400489
490 /* install a new client and return with it unready */
491install_client:
492 clp = new;
493 list_add(&clp->cl_share_link, &nfs_client_list);
494 spin_unlock(&nfs_client_lock);
495 dprintk("--> nfs_get_client() = %p [new]\n", clp);
496 return clp;
497
498 /* found an existing client
499 * - make sure it's ready before returning
500 */
501found_client:
502 spin_unlock(&nfs_client_lock);
503
504 if (new)
505 nfs_free_client(new);
506
Matthew Wilcox150030b2007-12-06 16:24:39 -0500507 error = wait_event_killable(nfs_client_active_wq,
Andy Adamson76db6d92009-04-01 09:22:38 -0400508 clp->cl_cons_state < NFS_CS_INITING);
Trond Myklebust0bae89e2006-10-08 14:33:24 -0400509 if (error < 0) {
510 nfs_put_client(clp);
511 return ERR_PTR(-ERESTARTSYS);
David Howells24c8dbb2006-08-22 20:06:10 -0400512 }
513
514 if (clp->cl_cons_state < NFS_CS_READY) {
515 error = clp->cl_cons_state;
516 nfs_put_client(clp);
517 return ERR_PTR(error);
518 }
519
David Howells54ceac42006-08-22 20:06:13 -0400520 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
521
David Howells24c8dbb2006-08-22 20:06:10 -0400522 dprintk("--> nfs_get_client() = %p [share]\n", clp);
523 return clp;
524}
525
526/*
527 * Mark a server as ready or failed
528 */
Andy Adamson76db6d92009-04-01 09:22:38 -0400529void nfs_mark_client_ready(struct nfs_client *clp, int state)
David Howells24c8dbb2006-08-22 20:06:10 -0400530{
531 clp->cl_cons_state = state;
532 wake_up_all(&nfs_client_active_wq);
533}
David Howells5006a762006-08-22 20:06:12 -0400534
535/*
Benny Halevy008f55d2009-04-01 09:22:50 -0400536 * With sessions, the client is not marked ready until after a
537 * successful EXCHANGE_ID and CREATE_SESSION.
538 *
539 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
540 * other versions of NFS can be tried.
541 */
542int nfs4_check_client_ready(struct nfs_client *clp)
543{
544 if (!nfs4_has_session(clp))
545 return 0;
546 if (clp->cl_cons_state < NFS_CS_READY)
547 return -EPROTONOSUPPORT;
548 return 0;
549}
550
551/*
David Howells5006a762006-08-22 20:06:12 -0400552 * Initialise the timeout values for a connection
553 */
554static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
555 unsigned int timeo, unsigned int retrans)
556{
557 to->to_initval = timeo * HZ / 10;
558 to->to_retries = retrans;
David Howells5006a762006-08-22 20:06:12 -0400559
560 switch (proto) {
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -0400561 case XPRT_TRANSPORT_TCP:
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -0400562 case XPRT_TRANSPORT_RDMA:
Trond Myklebust259875e2008-07-02 14:43:47 -0400563 if (to->to_retries == 0)
564 to->to_retries = NFS_DEF_TCP_RETRANS;
Trond Myklebust7a3e3e12007-12-20 16:03:57 -0500565 if (to->to_initval == 0)
Trond Myklebust259875e2008-07-02 14:43:47 -0400566 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
David Howells5006a762006-08-22 20:06:12 -0400567 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
568 to->to_initval = NFS_MAX_TCP_TIMEOUT;
569 to->to_increment = to->to_initval;
570 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
Trond Myklebust7a3e3e12007-12-20 16:03:57 -0500571 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
572 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
573 if (to->to_maxval < to->to_initval)
574 to->to_maxval = to->to_initval;
David Howells5006a762006-08-22 20:06:12 -0400575 to->to_exponential = 0;
576 break;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -0400577 case XPRT_TRANSPORT_UDP:
Trond Myklebust259875e2008-07-02 14:43:47 -0400578 if (to->to_retries == 0)
579 to->to_retries = NFS_DEF_UDP_RETRANS;
David Howells5006a762006-08-22 20:06:12 -0400580 if (!to->to_initval)
Trond Myklebust259875e2008-07-02 14:43:47 -0400581 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
David Howells5006a762006-08-22 20:06:12 -0400582 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
583 to->to_initval = NFS_MAX_UDP_TIMEOUT;
584 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
585 to->to_exponential = 1;
586 break;
Trond Myklebust259875e2008-07-02 14:43:47 -0400587 default:
588 BUG();
David Howells5006a762006-08-22 20:06:12 -0400589 }
590}
591
592/*
593 * Create an RPC client handle
594 */
Trond Myklebust59dca3b2008-01-03 16:29:06 -0500595static int nfs_create_rpc_client(struct nfs_client *clp,
Trond Myklebust33170232007-12-20 16:03:59 -0500596 const struct rpc_timeout *timeparms,
597 rpc_authflavor_t flavor,
Chuck Lever4a01b8a2008-12-23 15:21:35 -0500598 int discrtry, int noresvport)
David Howells5006a762006-08-22 20:06:12 -0400599{
David Howells5006a762006-08-22 20:06:12 -0400600 struct rpc_clnt *clnt = NULL;
Chuck Lever41877d22006-08-22 20:06:20 -0400601 struct rpc_create_args args = {
Trond Myklebust59dca3b2008-01-03 16:29:06 -0500602 .protocol = clp->cl_proto,
Chuck Lever41877d22006-08-22 20:06:20 -0400603 .address = (struct sockaddr *)&clp->cl_addr,
Chuck Lever6e4cffd2007-12-10 14:58:15 -0500604 .addrsize = clp->cl_addrlen,
Trond Myklebust33170232007-12-20 16:03:59 -0500605 .timeout = timeparms,
Chuck Lever41877d22006-08-22 20:06:20 -0400606 .servername = clp->cl_hostname,
607 .program = &nfs_program,
608 .version = clp->rpc_ops->version,
609 .authflavor = flavor,
610 };
David Howells5006a762006-08-22 20:06:12 -0400611
Chuck Lever4a01b8a2008-12-23 15:21:35 -0500612 if (discrtry)
613 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
614 if (noresvport)
615 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
616
David Howells5006a762006-08-22 20:06:12 -0400617 if (!IS_ERR(clp->cl_rpcclient))
618 return 0;
619
Chuck Lever41877d22006-08-22 20:06:20 -0400620 clnt = rpc_create(&args);
David Howells5006a762006-08-22 20:06:12 -0400621 if (IS_ERR(clnt)) {
622 dprintk("%s: cannot create RPC client. Error = %ld\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700623 __func__, PTR_ERR(clnt));
David Howells5006a762006-08-22 20:06:12 -0400624 return PTR_ERR(clnt);
625 }
626
David Howells5006a762006-08-22 20:06:12 -0400627 clp->cl_rpcclient = clnt;
628 return 0;
629}
David Howells54ceac42006-08-22 20:06:13 -0400630
631/*
632 * Version 2 or 3 client destruction
633 */
634static void nfs_destroy_server(struct nfs_server *server)
635{
David Howells54ceac42006-08-22 20:06:13 -0400636 if (!(server->flags & NFS_MOUNT_NONLM))
Chuck Lever9289e7f2008-01-11 17:09:52 -0500637 nlmclnt_done(server->nlm_host);
David Howells54ceac42006-08-22 20:06:13 -0400638}
639
640/*
641 * Version 2 or 3 lockd setup
642 */
643static int nfs_start_lockd(struct nfs_server *server)
644{
Chuck Lever9289e7f2008-01-11 17:09:52 -0500645 struct nlm_host *host;
646 struct nfs_client *clp = server->nfs_client;
Chuck Lever883bb162008-01-15 16:04:20 -0500647 struct nlmclnt_initdata nlm_init = {
648 .hostname = clp->cl_hostname,
649 .address = (struct sockaddr *)&clp->cl_addr,
650 .addrlen = clp->cl_addrlen,
651 .protocol = server->flags & NFS_MOUNT_TCP ?
652 IPPROTO_TCP : IPPROTO_UDP,
653 .nfs_version = clp->rpc_ops->version,
Chuck Lever0cb26592008-12-23 15:21:38 -0500654 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
655 1 : 0,
Chuck Lever883bb162008-01-15 16:04:20 -0500656 };
David Howells54ceac42006-08-22 20:06:13 -0400657
Chuck Lever883bb162008-01-15 16:04:20 -0500658 if (nlm_init.nfs_version > 3)
Chuck Lever9289e7f2008-01-11 17:09:52 -0500659 return 0;
David Howells54ceac42006-08-22 20:06:13 -0400660 if (server->flags & NFS_MOUNT_NONLM)
Chuck Lever9289e7f2008-01-11 17:09:52 -0500661 return 0;
662
Chuck Lever883bb162008-01-15 16:04:20 -0500663 host = nlmclnt_init(&nlm_init);
Chuck Lever9289e7f2008-01-11 17:09:52 -0500664 if (IS_ERR(host))
665 return PTR_ERR(host);
666
667 server->nlm_host = host;
668 server->destroy = nfs_destroy_server;
669 return 0;
David Howells54ceac42006-08-22 20:06:13 -0400670}
671
672/*
673 * Initialise an NFSv3 ACL client connection
674 */
675#ifdef CONFIG_NFS_V3_ACL
676static void nfs_init_server_aclclient(struct nfs_server *server)
677{
Trond Myklebust40c553192007-12-14 14:56:07 -0500678 if (server->nfs_client->rpc_ops->version != 3)
David Howells54ceac42006-08-22 20:06:13 -0400679 goto out_noacl;
680 if (server->flags & NFS_MOUNT_NOACL)
681 goto out_noacl;
682
683 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
684 if (IS_ERR(server->client_acl))
685 goto out_noacl;
686
687 /* No errors! Assume that Sun nfsacls are supported */
688 server->caps |= NFS_CAP_ACLS;
689 return;
690
691out_noacl:
692 server->caps &= ~NFS_CAP_ACLS;
693}
694#else
695static inline void nfs_init_server_aclclient(struct nfs_server *server)
696{
697 server->flags &= ~NFS_MOUNT_NOACL;
698 server->caps &= ~NFS_CAP_ACLS;
699}
700#endif
701
702/*
703 * Create a general RPC client
704 */
Trond Myklebust33170232007-12-20 16:03:59 -0500705static int nfs_init_server_rpcclient(struct nfs_server *server,
706 const struct rpc_timeout *timeo,
707 rpc_authflavor_t pseudoflavour)
David Howells54ceac42006-08-22 20:06:13 -0400708{
709 struct nfs_client *clp = server->nfs_client;
710
711 server->client = rpc_clone_client(clp->cl_rpcclient);
712 if (IS_ERR(server->client)) {
Harvey Harrison3110ff82008-05-02 13:42:44 -0700713 dprintk("%s: couldn't create rpc_client!\n", __func__);
David Howells54ceac42006-08-22 20:06:13 -0400714 return PTR_ERR(server->client);
715 }
716
Trond Myklebust33170232007-12-20 16:03:59 -0500717 memcpy(&server->client->cl_timeout_default,
718 timeo,
719 sizeof(server->client->cl_timeout_default));
720 server->client->cl_timeout = &server->client->cl_timeout_default;
721
David Howells54ceac42006-08-22 20:06:13 -0400722 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
723 struct rpc_auth *auth;
724
725 auth = rpcauth_create(pseudoflavour, server->client);
726 if (IS_ERR(auth)) {
Harvey Harrison3110ff82008-05-02 13:42:44 -0700727 dprintk("%s: couldn't create credcache!\n", __func__);
David Howells54ceac42006-08-22 20:06:13 -0400728 return PTR_ERR(auth);
729 }
730 }
731 server->client->cl_softrtry = 0;
732 if (server->flags & NFS_MOUNT_SOFT)
733 server->client->cl_softrtry = 1;
734
David Howells54ceac42006-08-22 20:06:13 -0400735 return 0;
736}
737
738/*
739 * Initialise an NFS2 or NFS3 client
740 */
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -0400741static int nfs_init_client(struct nfs_client *clp,
Trond Myklebust33170232007-12-20 16:03:59 -0500742 const struct rpc_timeout *timeparms,
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -0400743 const struct nfs_parsed_mount_data *data)
David Howells54ceac42006-08-22 20:06:13 -0400744{
David Howells54ceac42006-08-22 20:06:13 -0400745 int error;
746
747 if (clp->cl_cons_state == NFS_CS_READY) {
748 /* the client is already initialised */
749 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
750 return 0;
751 }
752
David Howells54ceac42006-08-22 20:06:13 -0400753 /*
754 * Create a client RPC handle for doing FSSTAT with UNIX auth only
755 * - RFC 2623, sec 2.3.2
756 */
Chuck Leverd7403512008-12-23 15:21:37 -0500757 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
758 0, data->flags & NFS_MOUNT_NORESVPORT);
David Howells54ceac42006-08-22 20:06:13 -0400759 if (error < 0)
760 goto error;
761 nfs_mark_client_ready(clp, NFS_CS_READY);
762 return 0;
763
764error:
765 nfs_mark_client_ready(clp, error);
766 dprintk("<-- nfs_init_client() = xerror %d\n", error);
767 return error;
768}
769
770/*
771 * Create a version 2 or 3 client
772 */
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -0400773static int nfs_init_server(struct nfs_server *server,
774 const struct nfs_parsed_mount_data *data)
David Howells54ceac42006-08-22 20:06:13 -0400775{
Trond Myklebust3a498022007-12-14 14:56:04 -0500776 struct nfs_client_initdata cl_init = {
777 .hostname = data->nfs_server.hostname,
Chuck Leverd7422c42007-12-10 14:58:51 -0500778 .addr = (const struct sockaddr *)&data->nfs_server.address,
Chuck Lever4c568012007-12-10 14:59:28 -0500779 .addrlen = data->nfs_server.addrlen,
Trond Myklebust40c553192007-12-14 14:56:07 -0500780 .rpc_ops = &nfs_v2_clientops,
Trond Myklebust59dca3b2008-01-03 16:29:06 -0500781 .proto = data->nfs_server.protocol,
Trond Myklebust3a498022007-12-14 14:56:04 -0500782 };
Trond Myklebust33170232007-12-20 16:03:59 -0500783 struct rpc_timeout timeparms;
David Howells54ceac42006-08-22 20:06:13 -0400784 struct nfs_client *clp;
Trond Myklebust3a498022007-12-14 14:56:04 -0500785 int error;
David Howells54ceac42006-08-22 20:06:13 -0400786
787 dprintk("--> nfs_init_server()\n");
788
789#ifdef CONFIG_NFS_V3
790 if (data->flags & NFS_MOUNT_VER3)
Trond Myklebust40c553192007-12-14 14:56:07 -0500791 cl_init.rpc_ops = &nfs_v3_clientops;
David Howells54ceac42006-08-22 20:06:13 -0400792#endif
793
794 /* Allocate or find a client reference we can use */
Trond Myklebust3a498022007-12-14 14:56:04 -0500795 clp = nfs_get_client(&cl_init);
David Howells54ceac42006-08-22 20:06:13 -0400796 if (IS_ERR(clp)) {
797 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
798 return PTR_ERR(clp);
799 }
800
Trond Myklebust33170232007-12-20 16:03:59 -0500801 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
802 data->timeo, data->retrans);
803 error = nfs_init_client(clp, &timeparms, data);
David Howells54ceac42006-08-22 20:06:13 -0400804 if (error < 0)
805 goto error;
806
807 server->nfs_client = clp;
808
809 /* Initialise the client representation from the mount data */
Trond Myklebustff3525a2008-08-15 16:59:14 -0400810 server->flags = data->flags;
David Howellsb797cac2009-04-03 16:42:48 +0100811 server->options = data->options;
David Howells54ceac42006-08-22 20:06:13 -0400812
813 if (data->rsize)
814 server->rsize = nfs_block_size(data->rsize, NULL);
815 if (data->wsize)
816 server->wsize = nfs_block_size(data->wsize, NULL);
817
818 server->acregmin = data->acregmin * HZ;
819 server->acregmax = data->acregmax * HZ;
820 server->acdirmin = data->acdirmin * HZ;
821 server->acdirmax = data->acdirmax * HZ;
822
823 /* Start lockd here, before we might error out */
824 error = nfs_start_lockd(server);
825 if (error < 0)
826 goto error;
827
Chuck Leverf22d6d72008-03-14 14:10:22 -0400828 server->port = data->nfs_server.port;
829
Trond Myklebust33170232007-12-20 16:03:59 -0500830 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
David Howells54ceac42006-08-22 20:06:13 -0400831 if (error < 0)
832 goto error;
833
Chuck Lever3f8400d2008-03-14 14:10:30 -0400834 /* Preserve the values of mount_server-related mount options */
835 if (data->mount_server.addrlen) {
836 memcpy(&server->mountd_address, &data->mount_server.address,
837 data->mount_server.addrlen);
838 server->mountd_addrlen = data->mount_server.addrlen;
839 }
840 server->mountd_version = data->mount_server.version;
841 server->mountd_port = data->mount_server.port;
842 server->mountd_protocol = data->mount_server.protocol;
843
David Howells54ceac42006-08-22 20:06:13 -0400844 server->namelen = data->namlen;
845 /* Create a client RPC handle for the NFSv3 ACL management interface */
846 nfs_init_server_aclclient(server);
David Howells54ceac42006-08-22 20:06:13 -0400847 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
848 return 0;
849
850error:
851 server->nfs_client = NULL;
852 nfs_put_client(clp);
853 dprintk("<-- nfs_init_server() = xerror %d\n", error);
854 return error;
855}
856
857/*
858 * Load up the server record from information gained in an fsinfo record
859 */
860static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
861{
862 unsigned long max_rpc_payload;
863
864 /* Work out a lot of parameters */
865 if (server->rsize == 0)
866 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
867 if (server->wsize == 0)
868 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
869
870 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
871 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
872 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
873 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
874
875 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
876 if (server->rsize > max_rpc_payload)
877 server->rsize = max_rpc_payload;
878 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
879 server->rsize = NFS_MAX_FILE_IO_SIZE;
880 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
Peter Zijlstrae0bf68d2007-10-16 23:25:46 -0700881
David Howells54ceac42006-08-22 20:06:13 -0400882 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
883
884 if (server->wsize > max_rpc_payload)
885 server->wsize = max_rpc_payload;
886 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
887 server->wsize = NFS_MAX_FILE_IO_SIZE;
888 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
889 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
890
891 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
892 if (server->dtsize > PAGE_CACHE_SIZE)
893 server->dtsize = PAGE_CACHE_SIZE;
894 if (server->dtsize > server->rsize)
895 server->dtsize = server->rsize;
896
897 if (server->flags & NFS_MOUNT_NOAC) {
898 server->acregmin = server->acregmax = 0;
899 server->acdirmin = server->acdirmax = 0;
900 }
901
902 server->maxfilesize = fsinfo->maxfilesize;
903
904 /* We're airborne Set socket buffersize */
905 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
906}
907
908/*
909 * Probe filesystem information, including the FSID on v2/v3
910 */
911static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
912{
913 struct nfs_fsinfo fsinfo;
914 struct nfs_client *clp = server->nfs_client;
915 int error;
916
917 dprintk("--> nfs_probe_fsinfo()\n");
918
919 if (clp->rpc_ops->set_capabilities != NULL) {
920 error = clp->rpc_ops->set_capabilities(server, mntfh);
921 if (error < 0)
922 goto out_error;
923 }
924
925 fsinfo.fattr = fattr;
926 nfs_fattr_init(fattr);
927 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
928 if (error < 0)
929 goto out_error;
930
931 nfs_server_set_fsinfo(server, &fsinfo);
Peter Zijlstrae0bf68d2007-10-16 23:25:46 -0700932 error = bdi_init(&server->backing_dev_info);
933 if (error)
934 goto out_error;
935
David Howells54ceac42006-08-22 20:06:13 -0400936
937 /* Get some general file system info */
938 if (server->namelen == 0) {
939 struct nfs_pathconf pathinfo;
940
941 pathinfo.fattr = fattr;
942 nfs_fattr_init(fattr);
943
944 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
945 server->namelen = pathinfo.max_namelen;
946 }
947
948 dprintk("<-- nfs_probe_fsinfo() = 0\n");
949 return 0;
950
951out_error:
952 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
953 return error;
954}
955
956/*
957 * Copy useful information when duplicating a server record
958 */
959static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
960{
961 target->flags = source->flags;
962 target->acregmin = source->acregmin;
963 target->acregmax = source->acregmax;
964 target->acdirmin = source->acdirmin;
965 target->acdirmax = source->acdirmax;
966 target->caps = source->caps;
967}
968
969/*
970 * Allocate and initialise a server record
971 */
972static struct nfs_server *nfs_alloc_server(void)
973{
974 struct nfs_server *server;
975
976 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
977 if (!server)
978 return NULL;
979
980 server->client = server->client_acl = ERR_PTR(-EINVAL);
981
982 /* Zero out the NFS state stuff */
983 INIT_LIST_HEAD(&server->client_link);
984 INIT_LIST_HEAD(&server->master_link);
985
Steve Dicksonef818a22007-11-08 04:05:04 -0500986 atomic_set(&server->active, 0);
987
David Howells54ceac42006-08-22 20:06:13 -0400988 server->io_stats = nfs_alloc_iostats();
989 if (!server->io_stats) {
990 kfree(server);
991 return NULL;
992 }
993
994 return server;
995}
996
997/*
998 * Free up a server record
999 */
1000void nfs_free_server(struct nfs_server *server)
1001{
1002 dprintk("--> nfs_free_server()\n");
1003
1004 spin_lock(&nfs_client_lock);
1005 list_del(&server->client_link);
1006 list_del(&server->master_link);
1007 spin_unlock(&nfs_client_lock);
1008
1009 if (server->destroy != NULL)
1010 server->destroy(server);
Trond Myklebust5cef3382007-12-11 22:01:56 -05001011
1012 if (!IS_ERR(server->client_acl))
1013 rpc_shutdown_client(server->client_acl);
David Howells54ceac42006-08-22 20:06:13 -04001014 if (!IS_ERR(server->client))
1015 rpc_shutdown_client(server->client);
1016
1017 nfs_put_client(server->nfs_client);
1018
1019 nfs_free_iostats(server->io_stats);
Peter Zijlstrae0bf68d2007-10-16 23:25:46 -07001020 bdi_destroy(&server->backing_dev_info);
David Howells54ceac42006-08-22 20:06:13 -04001021 kfree(server);
1022 nfs_release_automount_timer();
1023 dprintk("<-- nfs_free_server()\n");
1024}
1025
1026/*
1027 * Create a version 2 or 3 volume record
1028 * - keyed on server and FSID
1029 */
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001030struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
David Howells54ceac42006-08-22 20:06:13 -04001031 struct nfs_fh *mntfh)
1032{
1033 struct nfs_server *server;
1034 struct nfs_fattr fattr;
1035 int error;
1036
1037 server = nfs_alloc_server();
1038 if (!server)
1039 return ERR_PTR(-ENOMEM);
1040
1041 /* Get a client representation */
1042 error = nfs_init_server(server, data);
1043 if (error < 0)
1044 goto error;
1045
1046 BUG_ON(!server->nfs_client);
1047 BUG_ON(!server->nfs_client->rpc_ops);
1048 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1049
1050 /* Probe the root fh to retrieve its FSID */
1051 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1052 if (error < 0)
1053 goto error;
Trond Myklebust54af3bb2007-09-28 12:27:41 -04001054 if (server->nfs_client->rpc_ops->version == 3) {
1055 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1056 server->namelen = NFS3_MAXNAMLEN;
1057 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1058 server->caps |= NFS_CAP_READDIRPLUS;
1059 } else {
1060 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1061 server->namelen = NFS2_MAXNAMLEN;
1062 }
1063
David Howells54ceac42006-08-22 20:06:13 -04001064 if (!(fattr.valid & NFS_ATTR_FATTR)) {
1065 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
1066 if (error < 0) {
1067 dprintk("nfs_create_server: getattr error = %d\n", -error);
1068 goto error;
1069 }
1070 }
1071 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
1072
David Howells6daabf12006-08-24 15:44:16 -04001073 dprintk("Server FSID: %llx:%llx\n",
1074 (unsigned long long) server->fsid.major,
1075 (unsigned long long) server->fsid.minor);
David Howells54ceac42006-08-22 20:06:13 -04001076
1077 BUG_ON(!server->nfs_client);
1078 BUG_ON(!server->nfs_client->rpc_ops);
1079 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1080
1081 spin_lock(&nfs_client_lock);
1082 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1083 list_add_tail(&server->master_link, &nfs_volume_list);
1084 spin_unlock(&nfs_client_lock);
1085
1086 server->mount_time = jiffies;
1087 return server;
1088
1089error:
1090 nfs_free_server(server);
1091 return ERR_PTR(error);
1092}
1093
1094#ifdef CONFIG_NFS_V4
1095/*
Benny Halevy9bdaa862009-04-01 09:22:55 -04001096 * Initialize the NFS4 callback service
1097 */
1098static int nfs4_init_callback(struct nfs_client *clp)
1099{
1100 int error;
1101
1102 if (clp->rpc_ops->version == 4) {
Andy Adamson0b5b7ae2009-04-01 09:23:15 -04001103 if (nfs4_has_session(clp)) {
1104 error = xprt_setup_backchannel(
1105 clp->cl_rpcclient->cl_xprt,
1106 NFS41_BC_MIN_CALLBACKS);
1107 if (error < 0)
1108 return error;
1109 }
1110
Benny Halevy71468512009-04-01 09:22:56 -04001111 error = nfs_callback_up(clp->cl_minorversion,
1112 clp->cl_rpcclient->cl_xprt);
Benny Halevy9bdaa862009-04-01 09:22:55 -04001113 if (error < 0) {
1114 dprintk("%s: failed to start callback. Error = %d\n",
1115 __func__, error);
1116 return error;
1117 }
1118 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
1119 }
1120 return 0;
1121}
1122
1123/*
Andy Adamson557134a2009-04-01 09:21:53 -04001124 * Initialize the minor version specific parts of an NFS4 client record
1125 */
1126static int nfs4_init_client_minor_version(struct nfs_client *clp)
1127{
Andy Adamsoncccef3b2009-04-01 09:22:03 -04001128 clp->cl_call_sync = _nfs4_call_sync;
1129
Andy Adamson557134a2009-04-01 09:21:53 -04001130#if defined(CONFIG_NFS_V4_1)
1131 if (clp->cl_minorversion) {
1132 struct nfs4_session *session = NULL;
1133 /*
1134 * Create the session and mark it expired.
1135 * When a SEQUENCE operation encounters the expired session
1136 * it will do session recovery to initialize it.
1137 */
1138 session = nfs4_alloc_session(clp);
1139 if (!session)
1140 return -ENOMEM;
1141
1142 clp->cl_session = session;
Andy Adamsoncccef3b2009-04-01 09:22:03 -04001143 clp->cl_call_sync = _nfs4_call_sync_session;
Andy Adamson557134a2009-04-01 09:21:53 -04001144 }
1145#endif /* CONFIG_NFS_V4_1 */
1146
Benny Halevy71468512009-04-01 09:22:56 -04001147 return nfs4_init_callback(clp);
Andy Adamson557134a2009-04-01 09:21:53 -04001148}
1149
1150/*
David Howells54ceac42006-08-22 20:06:13 -04001151 * Initialise an NFS4 client record
1152 */
1153static int nfs4_init_client(struct nfs_client *clp,
Trond Myklebust33170232007-12-20 16:03:59 -05001154 const struct rpc_timeout *timeparms,
J. Bruce Fields7d9ac062006-10-19 23:28:39 -07001155 const char *ip_addr,
Chuck Leverd7403512008-12-23 15:21:37 -05001156 rpc_authflavor_t authflavour,
1157 int flags)
David Howells54ceac42006-08-22 20:06:13 -04001158{
1159 int error;
1160
1161 if (clp->cl_cons_state == NFS_CS_READY) {
1162 /* the client is initialised already */
1163 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1164 return 0;
1165 }
1166
1167 /* Check NFS protocol revision and initialize RPC op vector */
1168 clp->rpc_ops = &nfs_v4_clientops;
1169
Trond Myklebust59dca3b2008-01-03 16:29:06 -05001170 error = nfs_create_rpc_client(clp, timeparms, authflavour,
Chuck Leverd7403512008-12-23 15:21:37 -05001171 1, flags & NFS_MOUNT_NORESVPORT);
David Howells54ceac42006-08-22 20:06:13 -04001172 if (error < 0)
1173 goto error;
J. Bruce Fields7d9ac062006-10-19 23:28:39 -07001174 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
David Howells54ceac42006-08-22 20:06:13 -04001175
1176 error = nfs_idmap_new(clp);
1177 if (error < 0) {
1178 dprintk("%s: failed to create idmapper. Error = %d\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -07001179 __func__, error);
David Howells54ceac42006-08-22 20:06:13 -04001180 goto error;
1181 }
Trond Myklebust9c5bf382006-08-22 20:06:14 -04001182 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
David Howells54ceac42006-08-22 20:06:13 -04001183
Andy Adamson557134a2009-04-01 09:21:53 -04001184 error = nfs4_init_client_minor_version(clp);
1185 if (error < 0)
1186 goto error;
1187
Andy Adamson76db6d92009-04-01 09:22:38 -04001188 if (!nfs4_has_session(clp))
1189 nfs_mark_client_ready(clp, NFS_CS_READY);
David Howells54ceac42006-08-22 20:06:13 -04001190 return 0;
1191
1192error:
1193 nfs_mark_client_ready(clp, error);
1194 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1195 return error;
1196}
1197
1198/*
1199 * Set up an NFS4 client
1200 */
1201static int nfs4_set_client(struct nfs_server *server,
Chuck Leverdcecae02007-12-10 14:58:59 -05001202 const char *hostname,
1203 const struct sockaddr *addr,
1204 const size_t addrlen,
J. Bruce Fields7d9ac062006-10-19 23:28:39 -07001205 const char *ip_addr,
David Howells54ceac42006-08-22 20:06:13 -04001206 rpc_authflavor_t authflavour,
Benny Halevy94a417f2009-04-01 09:21:49 -04001207 int proto, const struct rpc_timeout *timeparms,
1208 u32 minorversion)
David Howells54ceac42006-08-22 20:06:13 -04001209{
Trond Myklebust3a498022007-12-14 14:56:04 -05001210 struct nfs_client_initdata cl_init = {
1211 .hostname = hostname,
Chuck Leverdcecae02007-12-10 14:58:59 -05001212 .addr = addr,
1213 .addrlen = addrlen,
Trond Myklebust40c553192007-12-14 14:56:07 -05001214 .rpc_ops = &nfs_v4_clientops,
Trond Myklebust59dca3b2008-01-03 16:29:06 -05001215 .proto = proto,
Benny Halevy5aae4a92009-04-01 09:21:50 -04001216 .minorversion = minorversion,
Trond Myklebust3a498022007-12-14 14:56:04 -05001217 };
David Howells54ceac42006-08-22 20:06:13 -04001218 struct nfs_client *clp;
1219 int error;
1220
1221 dprintk("--> nfs4_set_client()\n");
1222
1223 /* Allocate or find a client reference we can use */
Trond Myklebust3a498022007-12-14 14:56:04 -05001224 clp = nfs_get_client(&cl_init);
David Howells54ceac42006-08-22 20:06:13 -04001225 if (IS_ERR(clp)) {
1226 error = PTR_ERR(clp);
1227 goto error;
1228 }
Chuck Leverd7403512008-12-23 15:21:37 -05001229 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
1230 server->flags);
David Howells54ceac42006-08-22 20:06:13 -04001231 if (error < 0)
1232 goto error_put;
1233
1234 server->nfs_client = clp;
1235 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1236 return 0;
1237
1238error_put:
1239 nfs_put_client(clp);
1240error:
1241 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1242 return error;
1243}
1244
Andy Adamson557134a2009-04-01 09:21:53 -04001245
1246/*
Andy Adamson96b09e02009-04-01 09:22:33 -04001247 * Session has been established, and the client marked ready.
1248 * Set the mount rsize and wsize with negotiated fore channel
1249 * attributes which will be bound checked in nfs_server_set_fsinfo.
1250 */
1251static void nfs4_session_set_rwsize(struct nfs_server *server)
1252{
1253#ifdef CONFIG_NFS_V4_1
1254 if (!nfs4_has_session(server->nfs_client))
1255 return;
1256 server->rsize = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
1257 server->wsize = server->nfs_client->cl_session->fc_attrs.max_rqst_sz;
1258#endif /* CONFIG_NFS_V4_1 */
1259}
1260
1261/*
David Howells54ceac42006-08-22 20:06:13 -04001262 * Create a version 4 volume record
1263 */
1264static int nfs4_init_server(struct nfs_server *server,
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001265 const struct nfs_parsed_mount_data *data)
David Howells54ceac42006-08-22 20:06:13 -04001266{
Trond Myklebust33170232007-12-20 16:03:59 -05001267 struct rpc_timeout timeparms;
David Howells54ceac42006-08-22 20:06:13 -04001268 int error;
1269
1270 dprintk("--> nfs4_init_server()\n");
1271
Trond Myklebust33170232007-12-20 16:03:59 -05001272 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1273 data->timeo, data->retrans);
1274
Chuck Lever542fcc32008-12-23 15:21:36 -05001275 /* Initialise the client representation from the mount data */
1276 server->flags = data->flags;
1277 server->caps |= NFS_CAP_ATOMIC_OPEN;
David Howellsb797cac2009-04-03 16:42:48 +01001278 server->options = data->options;
Chuck Lever542fcc32008-12-23 15:21:36 -05001279
Trond Myklebust33170232007-12-20 16:03:59 -05001280 /* Get a client record */
1281 error = nfs4_set_client(server,
1282 data->nfs_server.hostname,
1283 (const struct sockaddr *)&data->nfs_server.address,
1284 data->nfs_server.addrlen,
1285 data->client_address,
1286 data->auth_flavors[0],
1287 data->nfs_server.protocol,
Benny Halevy94a417f2009-04-01 09:21:49 -04001288 &timeparms,
1289 data->minorversion);
Trond Myklebust33170232007-12-20 16:03:59 -05001290 if (error < 0)
1291 goto error;
1292
David Howells54ceac42006-08-22 20:06:13 -04001293 if (data->rsize)
1294 server->rsize = nfs_block_size(data->rsize, NULL);
1295 if (data->wsize)
1296 server->wsize = nfs_block_size(data->wsize, NULL);
1297
1298 server->acregmin = data->acregmin * HZ;
1299 server->acregmax = data->acregmax * HZ;
1300 server->acdirmin = data->acdirmin * HZ;
1301 server->acdirmax = data->acdirmax * HZ;
1302
Chuck Leverf22d6d72008-03-14 14:10:22 -04001303 server->port = data->nfs_server.port;
1304
Trond Myklebust33170232007-12-20 16:03:59 -05001305 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
David Howells54ceac42006-08-22 20:06:13 -04001306
Trond Myklebust33170232007-12-20 16:03:59 -05001307error:
David Howells54ceac42006-08-22 20:06:13 -04001308 /* Done */
1309 dprintk("<-- nfs4_init_server() = %d\n", error);
1310 return error;
1311}
1312
1313/*
1314 * Create a version 4 volume record
1315 * - keyed on server and FSID
1316 */
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001317struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
David Howells54ceac42006-08-22 20:06:13 -04001318 struct nfs_fh *mntfh)
1319{
1320 struct nfs_fattr fattr;
1321 struct nfs_server *server;
1322 int error;
1323
1324 dprintk("--> nfs4_create_server()\n");
1325
1326 server = nfs_alloc_server();
1327 if (!server)
1328 return ERR_PTR(-ENOMEM);
1329
David Howells54ceac42006-08-22 20:06:13 -04001330 /* set up the general RPC client */
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001331 error = nfs4_init_server(server, data);
David Howells54ceac42006-08-22 20:06:13 -04001332 if (error < 0)
1333 goto error;
1334
1335 BUG_ON(!server->nfs_client);
1336 BUG_ON(!server->nfs_client->rpc_ops);
1337 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1338
Trond Myklebustfccba802009-07-21 16:48:07 -04001339 error = nfs4_init_session(server);
1340 if (error < 0)
1341 goto error;
Andy Adamson557134a2009-04-01 09:21:53 -04001342
David Howells54ceac42006-08-22 20:06:13 -04001343 /* Probe the root fh to retrieve its FSID */
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001344 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
David Howells54ceac42006-08-22 20:06:13 -04001345 if (error < 0)
1346 goto error;
1347
David Howells6daabf12006-08-24 15:44:16 -04001348 dprintk("Server FSID: %llx:%llx\n",
1349 (unsigned long long) server->fsid.major,
1350 (unsigned long long) server->fsid.minor);
David Howells54ceac42006-08-22 20:06:13 -04001351 dprintk("Mount FH: %d\n", mntfh->size);
1352
Andy Adamson96b09e02009-04-01 09:22:33 -04001353 nfs4_session_set_rwsize(server);
1354
David Howells54ceac42006-08-22 20:06:13 -04001355 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1356 if (error < 0)
1357 goto error;
1358
Trond Myklebust54af3bb2007-09-28 12:27:41 -04001359 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1360 server->namelen = NFS4_MAXNAMLEN;
1361
David Howells54ceac42006-08-22 20:06:13 -04001362 BUG_ON(!server->nfs_client);
1363 BUG_ON(!server->nfs_client->rpc_ops);
1364 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1365
1366 spin_lock(&nfs_client_lock);
1367 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1368 list_add_tail(&server->master_link, &nfs_volume_list);
1369 spin_unlock(&nfs_client_lock);
1370
1371 server->mount_time = jiffies;
1372 dprintk("<-- nfs4_create_server() = %p\n", server);
1373 return server;
1374
1375error:
1376 nfs_free_server(server);
1377 dprintk("<-- nfs4_create_server() = error %d\n", error);
1378 return ERR_PTR(error);
1379}
1380
1381/*
1382 * Create an NFS4 referral server record
1383 */
1384struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
Trond Myklebustf2d0d852007-02-02 14:46:09 -08001385 struct nfs_fh *mntfh)
David Howells54ceac42006-08-22 20:06:13 -04001386{
1387 struct nfs_client *parent_client;
1388 struct nfs_server *server, *parent_server;
1389 struct nfs_fattr fattr;
1390 int error;
1391
1392 dprintk("--> nfs4_create_referral_server()\n");
1393
1394 server = nfs_alloc_server();
1395 if (!server)
1396 return ERR_PTR(-ENOMEM);
1397
1398 parent_server = NFS_SB(data->sb);
1399 parent_client = parent_server->nfs_client;
1400
Chuck Lever542fcc32008-12-23 15:21:36 -05001401 /* Initialise the client representation from the parent server */
1402 nfs_server_copy_userdata(server, parent_server);
1403 server->caps |= NFS_CAP_ATOMIC_OPEN;
1404
David Howells54ceac42006-08-22 20:06:13 -04001405 /* Get a client representation.
1406 * Note: NFSv4 always uses TCP, */
Chuck Leverdcecae02007-12-10 14:58:59 -05001407 error = nfs4_set_client(server, data->hostname,
Chuck Lever6677d092007-12-10 14:59:06 -05001408 data->addr,
1409 data->addrlen,
Chuck Leverdcecae02007-12-10 14:58:59 -05001410 parent_client->cl_ipaddr,
1411 data->authflavor,
1412 parent_server->client->cl_xprt->prot,
Benny Halevy94a417f2009-04-01 09:21:49 -04001413 parent_server->client->cl_timeout,
1414 parent_client->cl_minorversion);
andros@citi.umich.edu297de4f2006-08-29 12:19:41 -04001415 if (error < 0)
1416 goto error;
David Howells54ceac42006-08-22 20:06:13 -04001417
Trond Myklebust33170232007-12-20 16:03:59 -05001418 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
David Howells54ceac42006-08-22 20:06:13 -04001419 if (error < 0)
1420 goto error;
1421
1422 BUG_ON(!server->nfs_client);
1423 BUG_ON(!server->nfs_client->rpc_ops);
1424 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1425
Trond Myklebustf2d0d852007-02-02 14:46:09 -08001426 /* Probe the root fh to retrieve its FSID and filehandle */
1427 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1428 if (error < 0)
1429 goto error;
1430
David Howells54ceac42006-08-22 20:06:13 -04001431 /* probe the filesystem info for this server filesystem */
Trond Myklebustf2d0d852007-02-02 14:46:09 -08001432 error = nfs_probe_fsinfo(server, mntfh, &fattr);
David Howells54ceac42006-08-22 20:06:13 -04001433 if (error < 0)
1434 goto error;
1435
Trond Myklebust54af3bb2007-09-28 12:27:41 -04001436 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1437 server->namelen = NFS4_MAXNAMLEN;
1438
David Howells54ceac42006-08-22 20:06:13 -04001439 dprintk("Referral FSID: %llx:%llx\n",
David Howells6daabf12006-08-24 15:44:16 -04001440 (unsigned long long) server->fsid.major,
1441 (unsigned long long) server->fsid.minor);
David Howells54ceac42006-08-22 20:06:13 -04001442
1443 spin_lock(&nfs_client_lock);
1444 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1445 list_add_tail(&server->master_link, &nfs_volume_list);
1446 spin_unlock(&nfs_client_lock);
1447
1448 server->mount_time = jiffies;
1449
1450 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1451 return server;
1452
1453error:
1454 nfs_free_server(server);
1455 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1456 return ERR_PTR(error);
1457}
1458
1459#endif /* CONFIG_NFS_V4 */
1460
1461/*
1462 * Clone an NFS2, NFS3 or NFS4 server record
1463 */
1464struct nfs_server *nfs_clone_server(struct nfs_server *source,
1465 struct nfs_fh *fh,
1466 struct nfs_fattr *fattr)
1467{
1468 struct nfs_server *server;
1469 struct nfs_fattr fattr_fsinfo;
1470 int error;
1471
1472 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
David Howells6daabf12006-08-24 15:44:16 -04001473 (unsigned long long) fattr->fsid.major,
1474 (unsigned long long) fattr->fsid.minor);
David Howells54ceac42006-08-22 20:06:13 -04001475
1476 server = nfs_alloc_server();
1477 if (!server)
1478 return ERR_PTR(-ENOMEM);
1479
1480 /* Copy data from the source */
1481 server->nfs_client = source->nfs_client;
1482 atomic_inc(&server->nfs_client->cl_count);
1483 nfs_server_copy_userdata(server, source);
1484
1485 server->fsid = fattr->fsid;
1486
Trond Myklebust33170232007-12-20 16:03:59 -05001487 error = nfs_init_server_rpcclient(server,
1488 source->client->cl_timeout,
1489 source->client->cl_auth->au_flavor);
David Howells54ceac42006-08-22 20:06:13 -04001490 if (error < 0)
1491 goto out_free_server;
1492 if (!IS_ERR(source->client_acl))
1493 nfs_init_server_aclclient(server);
1494
1495 /* probe the filesystem info for this server filesystem */
1496 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1497 if (error < 0)
1498 goto out_free_server;
1499
Trond Myklebust54af3bb2007-09-28 12:27:41 -04001500 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1501 server->namelen = NFS4_MAXNAMLEN;
1502
David Howells54ceac42006-08-22 20:06:13 -04001503 dprintk("Cloned FSID: %llx:%llx\n",
David Howells6daabf12006-08-24 15:44:16 -04001504 (unsigned long long) server->fsid.major,
1505 (unsigned long long) server->fsid.minor);
David Howells54ceac42006-08-22 20:06:13 -04001506
1507 error = nfs_start_lockd(server);
1508 if (error < 0)
1509 goto out_free_server;
1510
1511 spin_lock(&nfs_client_lock);
1512 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1513 list_add_tail(&server->master_link, &nfs_volume_list);
1514 spin_unlock(&nfs_client_lock);
1515
1516 server->mount_time = jiffies;
1517
1518 dprintk("<-- nfs_clone_server() = %p\n", server);
1519 return server;
1520
1521out_free_server:
1522 nfs_free_server(server);
1523 dprintk("<-- nfs_clone_server() = error %d\n", error);
1524 return ERR_PTR(error);
1525}
David Howells6aaca562006-08-22 20:06:13 -04001526
1527#ifdef CONFIG_PROC_FS
1528static struct proc_dir_entry *proc_fs_nfs;
1529
1530static int nfs_server_list_open(struct inode *inode, struct file *file);
1531static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1532static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1533static void nfs_server_list_stop(struct seq_file *p, void *v);
1534static int nfs_server_list_show(struct seq_file *m, void *v);
1535
1536static struct seq_operations nfs_server_list_ops = {
1537 .start = nfs_server_list_start,
1538 .next = nfs_server_list_next,
1539 .stop = nfs_server_list_stop,
1540 .show = nfs_server_list_show,
1541};
1542
Arjan van de Ven00977a52007-02-12 00:55:34 -08001543static const struct file_operations nfs_server_list_fops = {
David Howells6aaca562006-08-22 20:06:13 -04001544 .open = nfs_server_list_open,
1545 .read = seq_read,
1546 .llseek = seq_lseek,
1547 .release = seq_release,
Denis V. Lunev34b37232008-04-29 01:02:07 -07001548 .owner = THIS_MODULE,
David Howells6aaca562006-08-22 20:06:13 -04001549};
1550
1551static int nfs_volume_list_open(struct inode *inode, struct file *file);
1552static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1553static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1554static void nfs_volume_list_stop(struct seq_file *p, void *v);
1555static int nfs_volume_list_show(struct seq_file *m, void *v);
1556
1557static struct seq_operations nfs_volume_list_ops = {
1558 .start = nfs_volume_list_start,
1559 .next = nfs_volume_list_next,
1560 .stop = nfs_volume_list_stop,
1561 .show = nfs_volume_list_show,
1562};
1563
Arjan van de Ven00977a52007-02-12 00:55:34 -08001564static const struct file_operations nfs_volume_list_fops = {
David Howells6aaca562006-08-22 20:06:13 -04001565 .open = nfs_volume_list_open,
1566 .read = seq_read,
1567 .llseek = seq_lseek,
1568 .release = seq_release,
Denis V. Lunev34b37232008-04-29 01:02:07 -07001569 .owner = THIS_MODULE,
David Howells6aaca562006-08-22 20:06:13 -04001570};
1571
1572/*
1573 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1574 * we're dealing
1575 */
1576static int nfs_server_list_open(struct inode *inode, struct file *file)
1577{
1578 struct seq_file *m;
1579 int ret;
1580
1581 ret = seq_open(file, &nfs_server_list_ops);
1582 if (ret < 0)
1583 return ret;
1584
1585 m = file->private_data;
1586 m->private = PDE(inode)->data;
1587
1588 return 0;
1589}
1590
1591/*
1592 * set up the iterator to start reading from the server list and return the first item
1593 */
1594static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1595{
David Howells6aaca562006-08-22 20:06:13 -04001596 /* lock the list against modification */
1597 spin_lock(&nfs_client_lock);
Pavel Emelianov259902e2007-07-15 23:39:56 -07001598 return seq_list_start_head(&nfs_client_list, *_pos);
David Howells6aaca562006-08-22 20:06:13 -04001599}
1600
1601/*
1602 * move to next server
1603 */
1604static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1605{
Pavel Emelianov259902e2007-07-15 23:39:56 -07001606 return seq_list_next(v, &nfs_client_list, pos);
David Howells6aaca562006-08-22 20:06:13 -04001607}
1608
1609/*
1610 * clean up after reading from the transports list
1611 */
1612static void nfs_server_list_stop(struct seq_file *p, void *v)
1613{
1614 spin_unlock(&nfs_client_lock);
1615}
1616
1617/*
1618 * display a header line followed by a load of call lines
1619 */
1620static int nfs_server_list_show(struct seq_file *m, void *v)
1621{
1622 struct nfs_client *clp;
1623
1624 /* display header on line 1 */
Pavel Emelianov259902e2007-07-15 23:39:56 -07001625 if (v == &nfs_client_list) {
David Howells6aaca562006-08-22 20:06:13 -04001626 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1627 return 0;
1628 }
1629
1630 /* display one transport per line on subsequent lines */
1631 clp = list_entry(v, struct nfs_client, cl_share_link);
1632
Chuck Lever5d8515c2007-12-10 14:57:16 -05001633 seq_printf(m, "v%u %s %s %3d %s\n",
Trond Myklebust40c553192007-12-14 14:56:07 -05001634 clp->rpc_ops->version,
Chuck Lever5d8515c2007-12-10 14:57:16 -05001635 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1636 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
David Howells6aaca562006-08-22 20:06:13 -04001637 atomic_read(&clp->cl_count),
1638 clp->cl_hostname);
1639
1640 return 0;
1641}
1642
1643/*
1644 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1645 */
1646static int nfs_volume_list_open(struct inode *inode, struct file *file)
1647{
1648 struct seq_file *m;
1649 int ret;
1650
1651 ret = seq_open(file, &nfs_volume_list_ops);
1652 if (ret < 0)
1653 return ret;
1654
1655 m = file->private_data;
1656 m->private = PDE(inode)->data;
1657
1658 return 0;
1659}
1660
1661/*
1662 * set up the iterator to start reading from the volume list and return the first item
1663 */
1664static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1665{
David Howells6aaca562006-08-22 20:06:13 -04001666 /* lock the list against modification */
1667 spin_lock(&nfs_client_lock);
Pavel Emelianov259902e2007-07-15 23:39:56 -07001668 return seq_list_start_head(&nfs_volume_list, *_pos);
David Howells6aaca562006-08-22 20:06:13 -04001669}
1670
1671/*
1672 * move to next volume
1673 */
1674static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1675{
Pavel Emelianov259902e2007-07-15 23:39:56 -07001676 return seq_list_next(v, &nfs_volume_list, pos);
David Howells6aaca562006-08-22 20:06:13 -04001677}
1678
1679/*
1680 * clean up after reading from the transports list
1681 */
1682static void nfs_volume_list_stop(struct seq_file *p, void *v)
1683{
1684 spin_unlock(&nfs_client_lock);
1685}
1686
1687/*
1688 * display a header line followed by a load of call lines
1689 */
1690static int nfs_volume_list_show(struct seq_file *m, void *v)
1691{
1692 struct nfs_server *server;
1693 struct nfs_client *clp;
1694 char dev[8], fsid[17];
1695
1696 /* display header on line 1 */
Pavel Emelianov259902e2007-07-15 23:39:56 -07001697 if (v == &nfs_volume_list) {
David Howells5d1acff2009-04-03 16:42:47 +01001698 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
David Howells6aaca562006-08-22 20:06:13 -04001699 return 0;
1700 }
1701 /* display one transport per line on subsequent lines */
1702 server = list_entry(v, struct nfs_server, master_link);
1703 clp = server->nfs_client;
1704
1705 snprintf(dev, 8, "%u:%u",
1706 MAJOR(server->s_dev), MINOR(server->s_dev));
1707
1708 snprintf(fsid, 17, "%llx:%llx",
David Howells6daabf12006-08-24 15:44:16 -04001709 (unsigned long long) server->fsid.major,
1710 (unsigned long long) server->fsid.minor);
David Howells6aaca562006-08-22 20:06:13 -04001711
David Howells5d1acff2009-04-03 16:42:47 +01001712 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
Trond Myklebust40c553192007-12-14 14:56:07 -05001713 clp->rpc_ops->version,
Chuck Lever5d8515c2007-12-10 14:57:16 -05001714 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1715 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
David Howells6aaca562006-08-22 20:06:13 -04001716 dev,
David Howells5d1acff2009-04-03 16:42:47 +01001717 fsid,
1718 nfs_server_fscache_state(server));
David Howells6aaca562006-08-22 20:06:13 -04001719
1720 return 0;
1721}
1722
1723/*
1724 * initialise the /proc/fs/nfsfs/ directory
1725 */
1726int __init nfs_fs_proc_init(void)
1727{
1728 struct proc_dir_entry *p;
1729
Alexey Dobriyan36a5aeb2008-04-29 01:01:42 -07001730 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
David Howells6aaca562006-08-22 20:06:13 -04001731 if (!proc_fs_nfs)
1732 goto error_0;
1733
David Howells6aaca562006-08-22 20:06:13 -04001734 /* a file of servers with which we're dealing */
Denis V. Lunev34b37232008-04-29 01:02:07 -07001735 p = proc_create("servers", S_IFREG|S_IRUGO,
1736 proc_fs_nfs, &nfs_server_list_fops);
David Howells6aaca562006-08-22 20:06:13 -04001737 if (!p)
1738 goto error_1;
1739
David Howells6aaca562006-08-22 20:06:13 -04001740 /* a file of volumes that we have mounted */
Denis V. Lunev34b37232008-04-29 01:02:07 -07001741 p = proc_create("volumes", S_IFREG|S_IRUGO,
1742 proc_fs_nfs, &nfs_volume_list_fops);
David Howells6aaca562006-08-22 20:06:13 -04001743 if (!p)
1744 goto error_2;
David Howells6aaca562006-08-22 20:06:13 -04001745 return 0;
1746
1747error_2:
1748 remove_proc_entry("servers", proc_fs_nfs);
1749error_1:
Alexey Dobriyan36a5aeb2008-04-29 01:01:42 -07001750 remove_proc_entry("fs/nfsfs", NULL);
David Howells6aaca562006-08-22 20:06:13 -04001751error_0:
1752 return -ENOMEM;
1753}
1754
1755/*
1756 * clean up the /proc/fs/nfsfs/ directory
1757 */
1758void nfs_fs_proc_exit(void)
1759{
1760 remove_proc_entry("volumes", proc_fs_nfs);
1761 remove_proc_entry("servers", proc_fs_nfs);
Alexey Dobriyan36a5aeb2008-04-29 01:01:42 -07001762 remove_proc_entry("fs/nfsfs", NULL);
David Howells6aaca562006-08-22 20:06:13 -04001763}
1764
1765#endif /* CONFIG_PROC_FS */