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24c8dbbb DH |
1 | /* 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 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | ||
17 | #include <linux/time.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/stat.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/unistd.h> | |
24 | #include <linux/sunrpc/clnt.h> | |
25 | #include <linux/sunrpc/stats.h> | |
26 | #include <linux/sunrpc/metrics.h> | |
27 | #include <linux/nfs_fs.h> | |
28 | #include <linux/nfs_mount.h> | |
29 | #include <linux/nfs4_mount.h> | |
30 | #include <linux/lockd/bind.h> | |
31 | #include <linux/smp_lock.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/nfs_xdr.h> | |
38 | ||
39 | #include <asm/system.h> | |
40 | ||
41 | #include "nfs4_fs.h" | |
42 | #include "callback.h" | |
43 | #include "delegation.h" | |
44 | #include "iostat.h" | |
45 | #include "internal.h" | |
46 | ||
47 | #define NFSDBG_FACILITY NFSDBG_CLIENT | |
48 | ||
49 | static DEFINE_SPINLOCK(nfs_client_lock); | |
50 | static LIST_HEAD(nfs_client_list); | |
54ceac45 | 51 | static LIST_HEAD(nfs_volume_list); |
24c8dbbb DH |
52 | static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); |
53 | ||
5006a76c DH |
54 | /* |
55 | * RPC cruft for NFS | |
56 | */ | |
57 | static struct rpc_version *nfs_version[5] = { | |
58 | [2] = &nfs_version2, | |
59 | #ifdef CONFIG_NFS_V3 | |
60 | [3] = &nfs_version3, | |
61 | #endif | |
62 | #ifdef CONFIG_NFS_V4 | |
63 | [4] = &nfs_version4, | |
64 | #endif | |
65 | }; | |
66 | ||
67 | struct rpc_program nfs_program = { | |
68 | .name = "nfs", | |
69 | .number = NFS_PROGRAM, | |
70 | .nrvers = ARRAY_SIZE(nfs_version), | |
71 | .version = nfs_version, | |
72 | .stats = &nfs_rpcstat, | |
73 | .pipe_dir_name = "/nfs", | |
74 | }; | |
75 | ||
76 | struct rpc_stat nfs_rpcstat = { | |
77 | .program = &nfs_program | |
78 | }; | |
79 | ||
80 | ||
81 | #ifdef CONFIG_NFS_V3_ACL | |
82 | static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; | |
83 | static struct rpc_version * nfsacl_version[] = { | |
84 | [3] = &nfsacl_version3, | |
85 | }; | |
86 | ||
87 | struct rpc_program nfsacl_program = { | |
88 | .name = "nfsacl", | |
89 | .number = NFS_ACL_PROGRAM, | |
90 | .nrvers = ARRAY_SIZE(nfsacl_version), | |
91 | .version = nfsacl_version, | |
92 | .stats = &nfsacl_rpcstat, | |
93 | }; | |
94 | #endif /* CONFIG_NFS_V3_ACL */ | |
95 | ||
24c8dbbb DH |
96 | /* |
97 | * Allocate a shared client record | |
98 | * | |
99 | * Since these are allocated/deallocated very rarely, we don't | |
100 | * bother putting them in a slab cache... | |
101 | */ | |
102 | static struct nfs_client *nfs_alloc_client(const char *hostname, | |
103 | const struct sockaddr_in *addr, | |
104 | int nfsversion) | |
105 | { | |
106 | struct nfs_client *clp; | |
107 | int error; | |
108 | ||
109 | if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) | |
110 | goto error_0; | |
111 | ||
112 | error = rpciod_up(); | |
113 | if (error < 0) { | |
114 | dprintk("%s: couldn't start rpciod! Error = %d\n", | |
115 | __FUNCTION__, error); | |
116 | __set_bit(NFS_CS_RPCIOD, &clp->cl_res_state); | |
117 | goto error_1; | |
118 | } | |
119 | ||
120 | if (nfsversion == 4) { | |
121 | if (nfs_callback_up() < 0) | |
122 | goto error_2; | |
123 | __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); | |
124 | } | |
125 | ||
126 | atomic_set(&clp->cl_count, 1); | |
127 | clp->cl_cons_state = NFS_CS_INITING; | |
128 | ||
129 | clp->cl_nfsversion = nfsversion; | |
130 | memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr)); | |
131 | ||
132 | if (hostname) { | |
133 | clp->cl_hostname = kstrdup(hostname, GFP_KERNEL); | |
134 | if (!clp->cl_hostname) | |
135 | goto error_3; | |
136 | } | |
137 | ||
138 | INIT_LIST_HEAD(&clp->cl_superblocks); | |
139 | clp->cl_rpcclient = ERR_PTR(-EINVAL); | |
140 | ||
141 | #ifdef CONFIG_NFS_V4 | |
142 | init_rwsem(&clp->cl_sem); | |
143 | INIT_LIST_HEAD(&clp->cl_delegations); | |
144 | INIT_LIST_HEAD(&clp->cl_state_owners); | |
145 | INIT_LIST_HEAD(&clp->cl_unused); | |
146 | spin_lock_init(&clp->cl_lock); | |
147 | INIT_WORK(&clp->cl_renewd, nfs4_renew_state, clp); | |
148 | rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); | |
149 | clp->cl_boot_time = CURRENT_TIME; | |
150 | clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; | |
151 | #endif | |
152 | ||
153 | return clp; | |
154 | ||
155 | error_3: | |
156 | nfs_callback_down(); | |
157 | __clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state); | |
158 | error_2: | |
159 | rpciod_down(); | |
160 | __clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state); | |
161 | error_1: | |
162 | kfree(clp); | |
163 | error_0: | |
164 | return NULL; | |
165 | } | |
166 | ||
167 | /* | |
168 | * Destroy a shared client record | |
169 | */ | |
170 | static void nfs_free_client(struct nfs_client *clp) | |
171 | { | |
172 | dprintk("--> nfs_free_client(%d)\n", clp->cl_nfsversion); | |
173 | ||
174 | #ifdef CONFIG_NFS_V4 | |
175 | if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) { | |
176 | while (!list_empty(&clp->cl_unused)) { | |
177 | struct nfs4_state_owner *sp; | |
178 | ||
179 | sp = list_entry(clp->cl_unused.next, | |
180 | struct nfs4_state_owner, | |
181 | so_list); | |
182 | list_del(&sp->so_list); | |
183 | kfree(sp); | |
184 | } | |
185 | BUG_ON(!list_empty(&clp->cl_state_owners)); | |
186 | nfs_idmap_delete(clp); | |
187 | } | |
188 | #endif | |
189 | ||
190 | /* -EIO all pending I/O */ | |
191 | if (!IS_ERR(clp->cl_rpcclient)) | |
192 | rpc_shutdown_client(clp->cl_rpcclient); | |
193 | ||
194 | if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) | |
195 | nfs_callback_down(); | |
196 | ||
197 | if (__test_and_clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state)) | |
198 | rpciod_down(); | |
199 | ||
200 | kfree(clp->cl_hostname); | |
201 | kfree(clp); | |
202 | ||
203 | dprintk("<-- nfs_free_client()\n"); | |
204 | } | |
205 | ||
206 | /* | |
207 | * Release a reference to a shared client record | |
208 | */ | |
209 | void nfs_put_client(struct nfs_client *clp) | |
210 | { | |
27ba8512 DH |
211 | if (!clp) |
212 | return; | |
213 | ||
24c8dbbb DH |
214 | dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); |
215 | ||
216 | if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { | |
217 | list_del(&clp->cl_share_link); | |
218 | spin_unlock(&nfs_client_lock); | |
219 | ||
220 | BUG_ON(!list_empty(&clp->cl_superblocks)); | |
221 | ||
222 | nfs_free_client(clp); | |
223 | } | |
224 | } | |
225 | ||
226 | /* | |
227 | * Find a client by address | |
228 | * - caller must hold nfs_client_lock | |
229 | */ | |
230 | static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion) | |
231 | { | |
232 | struct nfs_client *clp; | |
233 | ||
234 | list_for_each_entry(clp, &nfs_client_list, cl_share_link) { | |
235 | /* Different NFS versions cannot share the same nfs_client */ | |
236 | if (clp->cl_nfsversion != nfsversion) | |
237 | continue; | |
238 | ||
239 | if (memcmp(&clp->cl_addr.sin_addr, &addr->sin_addr, | |
240 | sizeof(clp->cl_addr.sin_addr)) != 0) | |
241 | continue; | |
242 | ||
243 | if (clp->cl_addr.sin_port == addr->sin_port) | |
244 | goto found; | |
245 | } | |
246 | ||
247 | return NULL; | |
248 | ||
249 | found: | |
250 | atomic_inc(&clp->cl_count); | |
251 | return clp; | |
252 | } | |
253 | ||
254 | /* | |
255 | * Find a client by IP address and protocol version | |
256 | * - returns NULL if no such client | |
257 | */ | |
258 | struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversion) | |
259 | { | |
260 | struct nfs_client *clp; | |
261 | ||
262 | spin_lock(&nfs_client_lock); | |
263 | clp = __nfs_find_client(addr, nfsversion); | |
264 | spin_unlock(&nfs_client_lock); | |
265 | ||
266 | BUG_ON(clp->cl_cons_state == 0); | |
267 | ||
268 | return clp; | |
269 | } | |
270 | ||
271 | /* | |
272 | * Look up a client by IP address and protocol version | |
273 | * - creates a new record if one doesn't yet exist | |
274 | */ | |
54ceac45 DH |
275 | static struct nfs_client *nfs_get_client(const char *hostname, |
276 | const struct sockaddr_in *addr, | |
277 | int nfsversion) | |
24c8dbbb DH |
278 | { |
279 | struct nfs_client *clp, *new = NULL; | |
280 | int error; | |
281 | ||
282 | dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%d)\n", | |
283 | hostname ?: "", NIPQUAD(addr->sin_addr), | |
284 | addr->sin_port, nfsversion); | |
285 | ||
286 | /* see if the client already exists */ | |
287 | do { | |
288 | spin_lock(&nfs_client_lock); | |
289 | ||
290 | clp = __nfs_find_client(addr, nfsversion); | |
291 | if (clp) | |
292 | goto found_client; | |
293 | if (new) | |
294 | goto install_client; | |
295 | ||
296 | spin_unlock(&nfs_client_lock); | |
297 | ||
298 | new = nfs_alloc_client(hostname, addr, nfsversion); | |
299 | } while (new); | |
300 | ||
301 | return ERR_PTR(-ENOMEM); | |
302 | ||
303 | /* install a new client and return with it unready */ | |
304 | install_client: | |
305 | clp = new; | |
306 | list_add(&clp->cl_share_link, &nfs_client_list); | |
307 | spin_unlock(&nfs_client_lock); | |
308 | dprintk("--> nfs_get_client() = %p [new]\n", clp); | |
309 | return clp; | |
310 | ||
311 | /* found an existing client | |
312 | * - make sure it's ready before returning | |
313 | */ | |
314 | found_client: | |
315 | spin_unlock(&nfs_client_lock); | |
316 | ||
317 | if (new) | |
318 | nfs_free_client(new); | |
319 | ||
320 | if (clp->cl_cons_state == NFS_CS_INITING) { | |
321 | DECLARE_WAITQUEUE(myself, current); | |
322 | ||
323 | add_wait_queue(&nfs_client_active_wq, &myself); | |
324 | ||
325 | for (;;) { | |
326 | set_current_state(TASK_INTERRUPTIBLE); | |
327 | if (signal_pending(current) || | |
328 | clp->cl_cons_state > NFS_CS_READY) | |
329 | break; | |
330 | schedule(); | |
331 | } | |
332 | ||
333 | remove_wait_queue(&nfs_client_active_wq, &myself); | |
334 | ||
335 | if (signal_pending(current)) { | |
336 | nfs_put_client(clp); | |
337 | return ERR_PTR(-ERESTARTSYS); | |
338 | } | |
339 | } | |
340 | ||
341 | if (clp->cl_cons_state < NFS_CS_READY) { | |
342 | error = clp->cl_cons_state; | |
343 | nfs_put_client(clp); | |
344 | return ERR_PTR(error); | |
345 | } | |
346 | ||
54ceac45 DH |
347 | BUG_ON(clp->cl_cons_state != NFS_CS_READY); |
348 | ||
24c8dbbb DH |
349 | dprintk("--> nfs_get_client() = %p [share]\n", clp); |
350 | return clp; | |
351 | } | |
352 | ||
353 | /* | |
354 | * Mark a server as ready or failed | |
355 | */ | |
54ceac45 | 356 | static void nfs_mark_client_ready(struct nfs_client *clp, int state) |
24c8dbbb DH |
357 | { |
358 | clp->cl_cons_state = state; | |
359 | wake_up_all(&nfs_client_active_wq); | |
360 | } | |
5006a76c DH |
361 | |
362 | /* | |
363 | * Initialise the timeout values for a connection | |
364 | */ | |
365 | static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, | |
366 | unsigned int timeo, unsigned int retrans) | |
367 | { | |
368 | to->to_initval = timeo * HZ / 10; | |
369 | to->to_retries = retrans; | |
370 | if (!to->to_retries) | |
371 | to->to_retries = 2; | |
372 | ||
373 | switch (proto) { | |
374 | case IPPROTO_TCP: | |
375 | if (!to->to_initval) | |
376 | to->to_initval = 60 * HZ; | |
377 | if (to->to_initval > NFS_MAX_TCP_TIMEOUT) | |
378 | to->to_initval = NFS_MAX_TCP_TIMEOUT; | |
379 | to->to_increment = to->to_initval; | |
380 | to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); | |
381 | to->to_exponential = 0; | |
382 | break; | |
383 | case IPPROTO_UDP: | |
384 | default: | |
385 | if (!to->to_initval) | |
386 | to->to_initval = 11 * HZ / 10; | |
387 | if (to->to_initval > NFS_MAX_UDP_TIMEOUT) | |
388 | to->to_initval = NFS_MAX_UDP_TIMEOUT; | |
389 | to->to_maxval = NFS_MAX_UDP_TIMEOUT; | |
390 | to->to_exponential = 1; | |
391 | break; | |
392 | } | |
393 | } | |
394 | ||
395 | /* | |
396 | * Create an RPC client handle | |
397 | */ | |
54ceac45 DH |
398 | static int nfs_create_rpc_client(struct nfs_client *clp, int proto, |
399 | unsigned int timeo, | |
400 | unsigned int retrans, | |
401 | rpc_authflavor_t flavor) | |
5006a76c DH |
402 | { |
403 | struct rpc_timeout timeparms; | |
404 | struct rpc_xprt *xprt = NULL; | |
405 | struct rpc_clnt *clnt = NULL; | |
406 | ||
407 | if (!IS_ERR(clp->cl_rpcclient)) | |
408 | return 0; | |
409 | ||
410 | nfs_init_timeout_values(&timeparms, proto, timeo, retrans); | |
411 | clp->retrans_timeo = timeparms.to_initval; | |
412 | clp->retrans_count = timeparms.to_retries; | |
413 | ||
414 | /* create transport and client */ | |
415 | xprt = xprt_create_proto(proto, &clp->cl_addr, &timeparms); | |
416 | if (IS_ERR(xprt)) { | |
417 | dprintk("%s: cannot create RPC transport. Error = %ld\n", | |
418 | __FUNCTION__, PTR_ERR(xprt)); | |
419 | return PTR_ERR(xprt); | |
420 | } | |
421 | ||
422 | /* Bind to a reserved port! */ | |
423 | xprt->resvport = 1; | |
424 | /* Create the client RPC handle */ | |
425 | clnt = rpc_create_client(xprt, clp->cl_hostname, &nfs_program, | |
426 | clp->rpc_ops->version, RPC_AUTH_UNIX); | |
427 | if (IS_ERR(clnt)) { | |
428 | dprintk("%s: cannot create RPC client. Error = %ld\n", | |
429 | __FUNCTION__, PTR_ERR(clnt)); | |
430 | return PTR_ERR(clnt); | |
431 | } | |
432 | ||
433 | clnt->cl_intr = 1; | |
434 | clnt->cl_softrtry = 1; | |
435 | clp->cl_rpcclient = clnt; | |
436 | return 0; | |
437 | } | |
54ceac45 DH |
438 | |
439 | /* | |
440 | * Version 2 or 3 client destruction | |
441 | */ | |
442 | static void nfs_destroy_server(struct nfs_server *server) | |
443 | { | |
444 | if (!IS_ERR(server->client_acl)) | |
445 | rpc_shutdown_client(server->client_acl); | |
446 | ||
447 | if (!(server->flags & NFS_MOUNT_NONLM)) | |
448 | lockd_down(); /* release rpc.lockd */ | |
449 | } | |
450 | ||
451 | /* | |
452 | * Version 2 or 3 lockd setup | |
453 | */ | |
454 | static int nfs_start_lockd(struct nfs_server *server) | |
455 | { | |
456 | int error = 0; | |
457 | ||
458 | if (server->nfs_client->cl_nfsversion > 3) | |
459 | goto out; | |
460 | if (server->flags & NFS_MOUNT_NONLM) | |
461 | goto out; | |
462 | error = lockd_up(); | |
463 | if (error < 0) | |
464 | server->flags |= NFS_MOUNT_NONLM; | |
465 | else | |
466 | server->destroy = nfs_destroy_server; | |
467 | out: | |
468 | return error; | |
469 | } | |
470 | ||
471 | /* | |
472 | * Initialise an NFSv3 ACL client connection | |
473 | */ | |
474 | #ifdef CONFIG_NFS_V3_ACL | |
475 | static void nfs_init_server_aclclient(struct nfs_server *server) | |
476 | { | |
477 | if (server->nfs_client->cl_nfsversion != 3) | |
478 | goto out_noacl; | |
479 | if (server->flags & NFS_MOUNT_NOACL) | |
480 | goto out_noacl; | |
481 | ||
482 | server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); | |
483 | if (IS_ERR(server->client_acl)) | |
484 | goto out_noacl; | |
485 | ||
486 | /* No errors! Assume that Sun nfsacls are supported */ | |
487 | server->caps |= NFS_CAP_ACLS; | |
488 | return; | |
489 | ||
490 | out_noacl: | |
491 | server->caps &= ~NFS_CAP_ACLS; | |
492 | } | |
493 | #else | |
494 | static inline void nfs_init_server_aclclient(struct nfs_server *server) | |
495 | { | |
496 | server->flags &= ~NFS_MOUNT_NOACL; | |
497 | server->caps &= ~NFS_CAP_ACLS; | |
498 | } | |
499 | #endif | |
500 | ||
501 | /* | |
502 | * Create a general RPC client | |
503 | */ | |
504 | static int nfs_init_server_rpcclient(struct nfs_server *server, rpc_authflavor_t pseudoflavour) | |
505 | { | |
506 | struct nfs_client *clp = server->nfs_client; | |
507 | ||
508 | server->client = rpc_clone_client(clp->cl_rpcclient); | |
509 | if (IS_ERR(server->client)) { | |
510 | dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__); | |
511 | return PTR_ERR(server->client); | |
512 | } | |
513 | ||
514 | if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { | |
515 | struct rpc_auth *auth; | |
516 | ||
517 | auth = rpcauth_create(pseudoflavour, server->client); | |
518 | if (IS_ERR(auth)) { | |
519 | dprintk("%s: couldn't create credcache!\n", __FUNCTION__); | |
520 | return PTR_ERR(auth); | |
521 | } | |
522 | } | |
523 | server->client->cl_softrtry = 0; | |
524 | if (server->flags & NFS_MOUNT_SOFT) | |
525 | server->client->cl_softrtry = 1; | |
526 | ||
527 | server->client->cl_intr = 0; | |
528 | if (server->flags & NFS4_MOUNT_INTR) | |
529 | server->client->cl_intr = 1; | |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
534 | /* | |
535 | * Initialise an NFS2 or NFS3 client | |
536 | */ | |
537 | static int nfs_init_client(struct nfs_client *clp, const struct nfs_mount_data *data) | |
538 | { | |
539 | int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP; | |
540 | int error; | |
541 | ||
542 | if (clp->cl_cons_state == NFS_CS_READY) { | |
543 | /* the client is already initialised */ | |
544 | dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); | |
545 | return 0; | |
546 | } | |
547 | ||
548 | /* Check NFS protocol revision and initialize RPC op vector */ | |
549 | clp->rpc_ops = &nfs_v2_clientops; | |
550 | #ifdef CONFIG_NFS_V3 | |
551 | if (clp->cl_nfsversion == 3) | |
552 | clp->rpc_ops = &nfs_v3_clientops; | |
553 | #endif | |
554 | /* | |
555 | * Create a client RPC handle for doing FSSTAT with UNIX auth only | |
556 | * - RFC 2623, sec 2.3.2 | |
557 | */ | |
558 | error = nfs_create_rpc_client(clp, proto, data->timeo, data->retrans, | |
559 | RPC_AUTH_UNIX); | |
560 | if (error < 0) | |
561 | goto error; | |
562 | nfs_mark_client_ready(clp, NFS_CS_READY); | |
563 | return 0; | |
564 | ||
565 | error: | |
566 | nfs_mark_client_ready(clp, error); | |
567 | dprintk("<-- nfs_init_client() = xerror %d\n", error); | |
568 | return error; | |
569 | } | |
570 | ||
571 | /* | |
572 | * Create a version 2 or 3 client | |
573 | */ | |
574 | static int nfs_init_server(struct nfs_server *server, const struct nfs_mount_data *data) | |
575 | { | |
576 | struct nfs_client *clp; | |
577 | int error, nfsvers = 2; | |
578 | ||
579 | dprintk("--> nfs_init_server()\n"); | |
580 | ||
581 | #ifdef CONFIG_NFS_V3 | |
582 | if (data->flags & NFS_MOUNT_VER3) | |
583 | nfsvers = 3; | |
584 | #endif | |
585 | ||
586 | /* Allocate or find a client reference we can use */ | |
587 | clp = nfs_get_client(data->hostname, &data->addr, nfsvers); | |
588 | if (IS_ERR(clp)) { | |
589 | dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); | |
590 | return PTR_ERR(clp); | |
591 | } | |
592 | ||
593 | error = nfs_init_client(clp, data); | |
594 | if (error < 0) | |
595 | goto error; | |
596 | ||
597 | server->nfs_client = clp; | |
598 | ||
599 | /* Initialise the client representation from the mount data */ | |
600 | server->flags = data->flags & NFS_MOUNT_FLAGMASK; | |
601 | ||
602 | if (data->rsize) | |
603 | server->rsize = nfs_block_size(data->rsize, NULL); | |
604 | if (data->wsize) | |
605 | server->wsize = nfs_block_size(data->wsize, NULL); | |
606 | ||
607 | server->acregmin = data->acregmin * HZ; | |
608 | server->acregmax = data->acregmax * HZ; | |
609 | server->acdirmin = data->acdirmin * HZ; | |
610 | server->acdirmax = data->acdirmax * HZ; | |
611 | ||
612 | /* Start lockd here, before we might error out */ | |
613 | error = nfs_start_lockd(server); | |
614 | if (error < 0) | |
615 | goto error; | |
616 | ||
617 | error = nfs_init_server_rpcclient(server, data->pseudoflavor); | |
618 | if (error < 0) | |
619 | goto error; | |
620 | ||
621 | server->namelen = data->namlen; | |
622 | /* Create a client RPC handle for the NFSv3 ACL management interface */ | |
623 | nfs_init_server_aclclient(server); | |
624 | if (clp->cl_nfsversion == 3) { | |
625 | if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) | |
626 | server->namelen = NFS3_MAXNAMLEN; | |
627 | server->caps |= NFS_CAP_READDIRPLUS; | |
628 | } else { | |
629 | if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) | |
630 | server->namelen = NFS2_MAXNAMLEN; | |
631 | } | |
632 | ||
633 | dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); | |
634 | return 0; | |
635 | ||
636 | error: | |
637 | server->nfs_client = NULL; | |
638 | nfs_put_client(clp); | |
639 | dprintk("<-- nfs_init_server() = xerror %d\n", error); | |
640 | return error; | |
641 | } | |
642 | ||
643 | /* | |
644 | * Load up the server record from information gained in an fsinfo record | |
645 | */ | |
646 | static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) | |
647 | { | |
648 | unsigned long max_rpc_payload; | |
649 | ||
650 | /* Work out a lot of parameters */ | |
651 | if (server->rsize == 0) | |
652 | server->rsize = nfs_block_size(fsinfo->rtpref, NULL); | |
653 | if (server->wsize == 0) | |
654 | server->wsize = nfs_block_size(fsinfo->wtpref, NULL); | |
655 | ||
656 | if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) | |
657 | server->rsize = nfs_block_size(fsinfo->rtmax, NULL); | |
658 | if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) | |
659 | server->wsize = nfs_block_size(fsinfo->wtmax, NULL); | |
660 | ||
661 | max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); | |
662 | if (server->rsize > max_rpc_payload) | |
663 | server->rsize = max_rpc_payload; | |
664 | if (server->rsize > NFS_MAX_FILE_IO_SIZE) | |
665 | server->rsize = NFS_MAX_FILE_IO_SIZE; | |
666 | server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
667 | server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; | |
668 | ||
669 | if (server->wsize > max_rpc_payload) | |
670 | server->wsize = max_rpc_payload; | |
671 | if (server->wsize > NFS_MAX_FILE_IO_SIZE) | |
672 | server->wsize = NFS_MAX_FILE_IO_SIZE; | |
673 | server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
674 | server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); | |
675 | ||
676 | server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); | |
677 | if (server->dtsize > PAGE_CACHE_SIZE) | |
678 | server->dtsize = PAGE_CACHE_SIZE; | |
679 | if (server->dtsize > server->rsize) | |
680 | server->dtsize = server->rsize; | |
681 | ||
682 | if (server->flags & NFS_MOUNT_NOAC) { | |
683 | server->acregmin = server->acregmax = 0; | |
684 | server->acdirmin = server->acdirmax = 0; | |
685 | } | |
686 | ||
687 | server->maxfilesize = fsinfo->maxfilesize; | |
688 | ||
689 | /* We're airborne Set socket buffersize */ | |
690 | rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); | |
691 | } | |
692 | ||
693 | /* | |
694 | * Probe filesystem information, including the FSID on v2/v3 | |
695 | */ | |
696 | static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) | |
697 | { | |
698 | struct nfs_fsinfo fsinfo; | |
699 | struct nfs_client *clp = server->nfs_client; | |
700 | int error; | |
701 | ||
702 | dprintk("--> nfs_probe_fsinfo()\n"); | |
703 | ||
704 | if (clp->rpc_ops->set_capabilities != NULL) { | |
705 | error = clp->rpc_ops->set_capabilities(server, mntfh); | |
706 | if (error < 0) | |
707 | goto out_error; | |
708 | } | |
709 | ||
710 | fsinfo.fattr = fattr; | |
711 | nfs_fattr_init(fattr); | |
712 | error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); | |
713 | if (error < 0) | |
714 | goto out_error; | |
715 | ||
716 | nfs_server_set_fsinfo(server, &fsinfo); | |
717 | ||
718 | /* Get some general file system info */ | |
719 | if (server->namelen == 0) { | |
720 | struct nfs_pathconf pathinfo; | |
721 | ||
722 | pathinfo.fattr = fattr; | |
723 | nfs_fattr_init(fattr); | |
724 | ||
725 | if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) | |
726 | server->namelen = pathinfo.max_namelen; | |
727 | } | |
728 | ||
729 | dprintk("<-- nfs_probe_fsinfo() = 0\n"); | |
730 | return 0; | |
731 | ||
732 | out_error: | |
733 | dprintk("nfs_probe_fsinfo: error = %d\n", -error); | |
734 | return error; | |
735 | } | |
736 | ||
737 | /* | |
738 | * Copy useful information when duplicating a server record | |
739 | */ | |
740 | static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) | |
741 | { | |
742 | target->flags = source->flags; | |
743 | target->acregmin = source->acregmin; | |
744 | target->acregmax = source->acregmax; | |
745 | target->acdirmin = source->acdirmin; | |
746 | target->acdirmax = source->acdirmax; | |
747 | target->caps = source->caps; | |
748 | } | |
749 | ||
750 | /* | |
751 | * Allocate and initialise a server record | |
752 | */ | |
753 | static struct nfs_server *nfs_alloc_server(void) | |
754 | { | |
755 | struct nfs_server *server; | |
756 | ||
757 | server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); | |
758 | if (!server) | |
759 | return NULL; | |
760 | ||
761 | server->client = server->client_acl = ERR_PTR(-EINVAL); | |
762 | ||
763 | /* Zero out the NFS state stuff */ | |
764 | INIT_LIST_HEAD(&server->client_link); | |
765 | INIT_LIST_HEAD(&server->master_link); | |
766 | ||
767 | server->io_stats = nfs_alloc_iostats(); | |
768 | if (!server->io_stats) { | |
769 | kfree(server); | |
770 | return NULL; | |
771 | } | |
772 | ||
773 | return server; | |
774 | } | |
775 | ||
776 | /* | |
777 | * Free up a server record | |
778 | */ | |
779 | void nfs_free_server(struct nfs_server *server) | |
780 | { | |
781 | dprintk("--> nfs_free_server()\n"); | |
782 | ||
783 | spin_lock(&nfs_client_lock); | |
784 | list_del(&server->client_link); | |
785 | list_del(&server->master_link); | |
786 | spin_unlock(&nfs_client_lock); | |
787 | ||
788 | if (server->destroy != NULL) | |
789 | server->destroy(server); | |
790 | if (!IS_ERR(server->client)) | |
791 | rpc_shutdown_client(server->client); | |
792 | ||
793 | nfs_put_client(server->nfs_client); | |
794 | ||
795 | nfs_free_iostats(server->io_stats); | |
796 | kfree(server); | |
797 | nfs_release_automount_timer(); | |
798 | dprintk("<-- nfs_free_server()\n"); | |
799 | } | |
800 | ||
801 | /* | |
802 | * Create a version 2 or 3 volume record | |
803 | * - keyed on server and FSID | |
804 | */ | |
805 | struct nfs_server *nfs_create_server(const struct nfs_mount_data *data, | |
806 | struct nfs_fh *mntfh) | |
807 | { | |
808 | struct nfs_server *server; | |
809 | struct nfs_fattr fattr; | |
810 | int error; | |
811 | ||
812 | server = nfs_alloc_server(); | |
813 | if (!server) | |
814 | return ERR_PTR(-ENOMEM); | |
815 | ||
816 | /* Get a client representation */ | |
817 | error = nfs_init_server(server, data); | |
818 | if (error < 0) | |
819 | goto error; | |
820 | ||
821 | BUG_ON(!server->nfs_client); | |
822 | BUG_ON(!server->nfs_client->rpc_ops); | |
823 | BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); | |
824 | ||
825 | /* Probe the root fh to retrieve its FSID */ | |
826 | error = nfs_probe_fsinfo(server, mntfh, &fattr); | |
827 | if (error < 0) | |
828 | goto error; | |
829 | if (!(fattr.valid & NFS_ATTR_FATTR)) { | |
830 | error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr); | |
831 | if (error < 0) { | |
832 | dprintk("nfs_create_server: getattr error = %d\n", -error); | |
833 | goto error; | |
834 | } | |
835 | } | |
836 | memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid)); | |
837 | ||
838 | dprintk("Server FSID: %llx:%llx\n", server->fsid.major, server->fsid.minor); | |
839 | ||
840 | BUG_ON(!server->nfs_client); | |
841 | BUG_ON(!server->nfs_client->rpc_ops); | |
842 | BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); | |
843 | ||
844 | spin_lock(&nfs_client_lock); | |
845 | list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); | |
846 | list_add_tail(&server->master_link, &nfs_volume_list); | |
847 | spin_unlock(&nfs_client_lock); | |
848 | ||
849 | server->mount_time = jiffies; | |
850 | return server; | |
851 | ||
852 | error: | |
853 | nfs_free_server(server); | |
854 | return ERR_PTR(error); | |
855 | } | |
856 | ||
857 | #ifdef CONFIG_NFS_V4 | |
858 | /* | |
859 | * Initialise an NFS4 client record | |
860 | */ | |
861 | static int nfs4_init_client(struct nfs_client *clp, | |
862 | int proto, int timeo, int retrans, | |
863 | rpc_authflavor_t authflavour) | |
864 | { | |
865 | int error; | |
866 | ||
867 | if (clp->cl_cons_state == NFS_CS_READY) { | |
868 | /* the client is initialised already */ | |
869 | dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); | |
870 | return 0; | |
871 | } | |
872 | ||
873 | /* Check NFS protocol revision and initialize RPC op vector */ | |
874 | clp->rpc_ops = &nfs_v4_clientops; | |
875 | ||
876 | error = nfs_create_rpc_client(clp, proto, timeo, retrans, authflavour); | |
877 | if (error < 0) | |
878 | goto error; | |
879 | ||
880 | error = nfs_idmap_new(clp); | |
881 | if (error < 0) { | |
882 | dprintk("%s: failed to create idmapper. Error = %d\n", | |
883 | __FUNCTION__, error); | |
884 | __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); | |
885 | goto error; | |
886 | } | |
887 | ||
888 | nfs_mark_client_ready(clp, NFS_CS_READY); | |
889 | return 0; | |
890 | ||
891 | error: | |
892 | nfs_mark_client_ready(clp, error); | |
893 | dprintk("<-- nfs4_init_client() = xerror %d\n", error); | |
894 | return error; | |
895 | } | |
896 | ||
897 | /* | |
898 | * Set up an NFS4 client | |
899 | */ | |
900 | static int nfs4_set_client(struct nfs_server *server, | |
901 | const char *hostname, const struct sockaddr_in *addr, | |
902 | rpc_authflavor_t authflavour, | |
903 | int proto, int timeo, int retrans) | |
904 | { | |
905 | struct nfs_client *clp; | |
906 | int error; | |
907 | ||
908 | dprintk("--> nfs4_set_client()\n"); | |
909 | ||
910 | /* Allocate or find a client reference we can use */ | |
911 | clp = nfs_get_client(hostname, addr, 4); | |
912 | if (IS_ERR(clp)) { | |
913 | error = PTR_ERR(clp); | |
914 | goto error; | |
915 | } | |
916 | error = nfs4_init_client(clp, proto, timeo, retrans, authflavour); | |
917 | if (error < 0) | |
918 | goto error_put; | |
919 | ||
920 | server->nfs_client = clp; | |
921 | dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); | |
922 | return 0; | |
923 | ||
924 | error_put: | |
925 | nfs_put_client(clp); | |
926 | error: | |
927 | dprintk("<-- nfs4_set_client() = xerror %d\n", error); | |
928 | return error; | |
929 | } | |
930 | ||
931 | /* | |
932 | * Create a version 4 volume record | |
933 | */ | |
934 | static int nfs4_init_server(struct nfs_server *server, | |
935 | const struct nfs4_mount_data *data, rpc_authflavor_t authflavour) | |
936 | { | |
937 | int error; | |
938 | ||
939 | dprintk("--> nfs4_init_server()\n"); | |
940 | ||
941 | /* Initialise the client representation from the mount data */ | |
942 | server->flags = data->flags & NFS_MOUNT_FLAGMASK; | |
943 | server->caps |= NFS_CAP_ATOMIC_OPEN; | |
944 | ||
945 | if (data->rsize) | |
946 | server->rsize = nfs_block_size(data->rsize, NULL); | |
947 | if (data->wsize) | |
948 | server->wsize = nfs_block_size(data->wsize, NULL); | |
949 | ||
950 | server->acregmin = data->acregmin * HZ; | |
951 | server->acregmax = data->acregmax * HZ; | |
952 | server->acdirmin = data->acdirmin * HZ; | |
953 | server->acdirmax = data->acdirmax * HZ; | |
954 | ||
955 | error = nfs_init_server_rpcclient(server, authflavour); | |
956 | ||
957 | /* Done */ | |
958 | dprintk("<-- nfs4_init_server() = %d\n", error); | |
959 | return error; | |
960 | } | |
961 | ||
962 | /* | |
963 | * Create a version 4 volume record | |
964 | * - keyed on server and FSID | |
965 | */ | |
966 | struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *data, | |
967 | const char *hostname, | |
968 | const struct sockaddr_in *addr, | |
969 | const char *mntpath, | |
970 | const char *ip_addr, | |
971 | rpc_authflavor_t authflavour, | |
972 | struct nfs_fh *mntfh) | |
973 | { | |
974 | struct nfs_fattr fattr; | |
975 | struct nfs_server *server; | |
976 | int error; | |
977 | ||
978 | dprintk("--> nfs4_create_server()\n"); | |
979 | ||
980 | server = nfs_alloc_server(); | |
981 | if (!server) | |
982 | return ERR_PTR(-ENOMEM); | |
983 | ||
984 | /* Get a client record */ | |
985 | error = nfs4_set_client(server, hostname, addr, authflavour, | |
986 | data->proto, data->timeo, data->retrans); | |
987 | if (error < 0) | |
988 | goto error; | |
989 | ||
990 | /* set up the general RPC client */ | |
991 | error = nfs4_init_server(server, data, authflavour); | |
992 | if (error < 0) | |
993 | goto error; | |
994 | ||
995 | BUG_ON(!server->nfs_client); | |
996 | BUG_ON(!server->nfs_client->rpc_ops); | |
997 | BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); | |
998 | ||
999 | /* Probe the root fh to retrieve its FSID */ | |
1000 | error = nfs4_path_walk(server, mntfh, mntpath); | |
1001 | if (error < 0) | |
1002 | goto error; | |
1003 | ||
1004 | dprintk("Server FSID: %llx:%llx\n", server->fsid.major, server->fsid.minor); | |
1005 | dprintk("Mount FH: %d\n", mntfh->size); | |
1006 | ||
1007 | error = nfs_probe_fsinfo(server, mntfh, &fattr); | |
1008 | if (error < 0) | |
1009 | goto error; | |
1010 | ||
1011 | BUG_ON(!server->nfs_client); | |
1012 | BUG_ON(!server->nfs_client->rpc_ops); | |
1013 | BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); | |
1014 | ||
1015 | spin_lock(&nfs_client_lock); | |
1016 | list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); | |
1017 | list_add_tail(&server->master_link, &nfs_volume_list); | |
1018 | spin_unlock(&nfs_client_lock); | |
1019 | ||
1020 | server->mount_time = jiffies; | |
1021 | dprintk("<-- nfs4_create_server() = %p\n", server); | |
1022 | return server; | |
1023 | ||
1024 | error: | |
1025 | nfs_free_server(server); | |
1026 | dprintk("<-- nfs4_create_server() = error %d\n", error); | |
1027 | return ERR_PTR(error); | |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * Create an NFS4 referral server record | |
1032 | */ | |
1033 | struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, | |
1034 | struct nfs_fh *fh) | |
1035 | { | |
1036 | struct nfs_client *parent_client; | |
1037 | struct nfs_server *server, *parent_server; | |
1038 | struct nfs_fattr fattr; | |
1039 | int error; | |
1040 | ||
1041 | dprintk("--> nfs4_create_referral_server()\n"); | |
1042 | ||
1043 | server = nfs_alloc_server(); | |
1044 | if (!server) | |
1045 | return ERR_PTR(-ENOMEM); | |
1046 | ||
1047 | parent_server = NFS_SB(data->sb); | |
1048 | parent_client = parent_server->nfs_client; | |
1049 | ||
1050 | /* Get a client representation. | |
1051 | * Note: NFSv4 always uses TCP, */ | |
1052 | error = nfs4_set_client(server, data->hostname, data->addr, | |
1053 | data->authflavor, | |
1054 | parent_server->client->cl_xprt->prot, | |
1055 | parent_client->retrans_timeo, | |
1056 | parent_client->retrans_count); | |
1057 | ||
1058 | /* Initialise the client representation from the parent server */ | |
1059 | nfs_server_copy_userdata(server, parent_server); | |
1060 | server->caps |= NFS_CAP_ATOMIC_OPEN; | |
1061 | ||
1062 | error = nfs_init_server_rpcclient(server, data->authflavor); | |
1063 | if (error < 0) | |
1064 | goto error; | |
1065 | ||
1066 | BUG_ON(!server->nfs_client); | |
1067 | BUG_ON(!server->nfs_client->rpc_ops); | |
1068 | BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); | |
1069 | ||
1070 | /* probe the filesystem info for this server filesystem */ | |
1071 | error = nfs_probe_fsinfo(server, fh, &fattr); | |
1072 | if (error < 0) | |
1073 | goto error; | |
1074 | ||
1075 | dprintk("Referral FSID: %llx:%llx\n", | |
1076 | server->fsid.major, server->fsid.minor); | |
1077 | ||
1078 | spin_lock(&nfs_client_lock); | |
1079 | list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); | |
1080 | list_add_tail(&server->master_link, &nfs_volume_list); | |
1081 | spin_unlock(&nfs_client_lock); | |
1082 | ||
1083 | server->mount_time = jiffies; | |
1084 | ||
1085 | dprintk("<-- nfs_create_referral_server() = %p\n", server); | |
1086 | return server; | |
1087 | ||
1088 | error: | |
1089 | nfs_free_server(server); | |
1090 | dprintk("<-- nfs4_create_referral_server() = error %d\n", error); | |
1091 | return ERR_PTR(error); | |
1092 | } | |
1093 | ||
1094 | #endif /* CONFIG_NFS_V4 */ | |
1095 | ||
1096 | /* | |
1097 | * Clone an NFS2, NFS3 or NFS4 server record | |
1098 | */ | |
1099 | struct nfs_server *nfs_clone_server(struct nfs_server *source, | |
1100 | struct nfs_fh *fh, | |
1101 | struct nfs_fattr *fattr) | |
1102 | { | |
1103 | struct nfs_server *server; | |
1104 | struct nfs_fattr fattr_fsinfo; | |
1105 | int error; | |
1106 | ||
1107 | dprintk("--> nfs_clone_server(,%llx:%llx,)\n", | |
1108 | fattr->fsid.major, fattr->fsid.minor); | |
1109 | ||
1110 | server = nfs_alloc_server(); | |
1111 | if (!server) | |
1112 | return ERR_PTR(-ENOMEM); | |
1113 | ||
1114 | /* Copy data from the source */ | |
1115 | server->nfs_client = source->nfs_client; | |
1116 | atomic_inc(&server->nfs_client->cl_count); | |
1117 | nfs_server_copy_userdata(server, source); | |
1118 | ||
1119 | server->fsid = fattr->fsid; | |
1120 | ||
1121 | error = nfs_init_server_rpcclient(server, source->client->cl_auth->au_flavor); | |
1122 | if (error < 0) | |
1123 | goto out_free_server; | |
1124 | if (!IS_ERR(source->client_acl)) | |
1125 | nfs_init_server_aclclient(server); | |
1126 | ||
1127 | /* probe the filesystem info for this server filesystem */ | |
1128 | error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo); | |
1129 | if (error < 0) | |
1130 | goto out_free_server; | |
1131 | ||
1132 | dprintk("Cloned FSID: %llx:%llx\n", | |
1133 | server->fsid.major, server->fsid.minor); | |
1134 | ||
1135 | error = nfs_start_lockd(server); | |
1136 | if (error < 0) | |
1137 | goto out_free_server; | |
1138 | ||
1139 | spin_lock(&nfs_client_lock); | |
1140 | list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); | |
1141 | list_add_tail(&server->master_link, &nfs_volume_list); | |
1142 | spin_unlock(&nfs_client_lock); | |
1143 | ||
1144 | server->mount_time = jiffies; | |
1145 | ||
1146 | dprintk("<-- nfs_clone_server() = %p\n", server); | |
1147 | return server; | |
1148 | ||
1149 | out_free_server: | |
1150 | nfs_free_server(server); | |
1151 | dprintk("<-- nfs_clone_server() = error %d\n", error); | |
1152 | return ERR_PTR(error); | |
1153 | } | |
6aaca566 DH |
1154 | |
1155 | #ifdef CONFIG_PROC_FS | |
1156 | static struct proc_dir_entry *proc_fs_nfs; | |
1157 | ||
1158 | static int nfs_server_list_open(struct inode *inode, struct file *file); | |
1159 | static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); | |
1160 | static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); | |
1161 | static void nfs_server_list_stop(struct seq_file *p, void *v); | |
1162 | static int nfs_server_list_show(struct seq_file *m, void *v); | |
1163 | ||
1164 | static struct seq_operations nfs_server_list_ops = { | |
1165 | .start = nfs_server_list_start, | |
1166 | .next = nfs_server_list_next, | |
1167 | .stop = nfs_server_list_stop, | |
1168 | .show = nfs_server_list_show, | |
1169 | }; | |
1170 | ||
1171 | static struct file_operations nfs_server_list_fops = { | |
1172 | .open = nfs_server_list_open, | |
1173 | .read = seq_read, | |
1174 | .llseek = seq_lseek, | |
1175 | .release = seq_release, | |
1176 | }; | |
1177 | ||
1178 | static int nfs_volume_list_open(struct inode *inode, struct file *file); | |
1179 | static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); | |
1180 | static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); | |
1181 | static void nfs_volume_list_stop(struct seq_file *p, void *v); | |
1182 | static int nfs_volume_list_show(struct seq_file *m, void *v); | |
1183 | ||
1184 | static struct seq_operations nfs_volume_list_ops = { | |
1185 | .start = nfs_volume_list_start, | |
1186 | .next = nfs_volume_list_next, | |
1187 | .stop = nfs_volume_list_stop, | |
1188 | .show = nfs_volume_list_show, | |
1189 | }; | |
1190 | ||
1191 | static struct file_operations nfs_volume_list_fops = { | |
1192 | .open = nfs_volume_list_open, | |
1193 | .read = seq_read, | |
1194 | .llseek = seq_lseek, | |
1195 | .release = seq_release, | |
1196 | }; | |
1197 | ||
1198 | /* | |
1199 | * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which | |
1200 | * we're dealing | |
1201 | */ | |
1202 | static int nfs_server_list_open(struct inode *inode, struct file *file) | |
1203 | { | |
1204 | struct seq_file *m; | |
1205 | int ret; | |
1206 | ||
1207 | ret = seq_open(file, &nfs_server_list_ops); | |
1208 | if (ret < 0) | |
1209 | return ret; | |
1210 | ||
1211 | m = file->private_data; | |
1212 | m->private = PDE(inode)->data; | |
1213 | ||
1214 | return 0; | |
1215 | } | |
1216 | ||
1217 | /* | |
1218 | * set up the iterator to start reading from the server list and return the first item | |
1219 | */ | |
1220 | static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) | |
1221 | { | |
1222 | struct list_head *_p; | |
1223 | loff_t pos = *_pos; | |
1224 | ||
1225 | /* lock the list against modification */ | |
1226 | spin_lock(&nfs_client_lock); | |
1227 | ||
1228 | /* allow for the header line */ | |
1229 | if (!pos) | |
1230 | return SEQ_START_TOKEN; | |
1231 | pos--; | |
1232 | ||
1233 | /* find the n'th element in the list */ | |
1234 | list_for_each(_p, &nfs_client_list) | |
1235 | if (!pos--) | |
1236 | break; | |
1237 | ||
1238 | return _p != &nfs_client_list ? _p : NULL; | |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * move to next server | |
1243 | */ | |
1244 | static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) | |
1245 | { | |
1246 | struct list_head *_p; | |
1247 | ||
1248 | (*pos)++; | |
1249 | ||
1250 | _p = v; | |
1251 | _p = (v == SEQ_START_TOKEN) ? nfs_client_list.next : _p->next; | |
1252 | ||
1253 | return _p != &nfs_client_list ? _p : NULL; | |
1254 | } | |
1255 | ||
1256 | /* | |
1257 | * clean up after reading from the transports list | |
1258 | */ | |
1259 | static void nfs_server_list_stop(struct seq_file *p, void *v) | |
1260 | { | |
1261 | spin_unlock(&nfs_client_lock); | |
1262 | } | |
1263 | ||
1264 | /* | |
1265 | * display a header line followed by a load of call lines | |
1266 | */ | |
1267 | static int nfs_server_list_show(struct seq_file *m, void *v) | |
1268 | { | |
1269 | struct nfs_client *clp; | |
1270 | ||
1271 | /* display header on line 1 */ | |
1272 | if (v == SEQ_START_TOKEN) { | |
1273 | seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); | |
1274 | return 0; | |
1275 | } | |
1276 | ||
1277 | /* display one transport per line on subsequent lines */ | |
1278 | clp = list_entry(v, struct nfs_client, cl_share_link); | |
1279 | ||
1280 | seq_printf(m, "v%d %02x%02x%02x%02x %4hx %3d %s\n", | |
1281 | clp->cl_nfsversion, | |
1282 | NIPQUAD(clp->cl_addr.sin_addr), | |
1283 | ntohs(clp->cl_addr.sin_port), | |
1284 | atomic_read(&clp->cl_count), | |
1285 | clp->cl_hostname); | |
1286 | ||
1287 | return 0; | |
1288 | } | |
1289 | ||
1290 | /* | |
1291 | * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes | |
1292 | */ | |
1293 | static int nfs_volume_list_open(struct inode *inode, struct file *file) | |
1294 | { | |
1295 | struct seq_file *m; | |
1296 | int ret; | |
1297 | ||
1298 | ret = seq_open(file, &nfs_volume_list_ops); | |
1299 | if (ret < 0) | |
1300 | return ret; | |
1301 | ||
1302 | m = file->private_data; | |
1303 | m->private = PDE(inode)->data; | |
1304 | ||
1305 | return 0; | |
1306 | } | |
1307 | ||
1308 | /* | |
1309 | * set up the iterator to start reading from the volume list and return the first item | |
1310 | */ | |
1311 | static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) | |
1312 | { | |
1313 | struct list_head *_p; | |
1314 | loff_t pos = *_pos; | |
1315 | ||
1316 | /* lock the list against modification */ | |
1317 | spin_lock(&nfs_client_lock); | |
1318 | ||
1319 | /* allow for the header line */ | |
1320 | if (!pos) | |
1321 | return SEQ_START_TOKEN; | |
1322 | pos--; | |
1323 | ||
1324 | /* find the n'th element in the list */ | |
1325 | list_for_each(_p, &nfs_volume_list) | |
1326 | if (!pos--) | |
1327 | break; | |
1328 | ||
1329 | return _p != &nfs_volume_list ? _p : NULL; | |
1330 | } | |
1331 | ||
1332 | /* | |
1333 | * move to next volume | |
1334 | */ | |
1335 | static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) | |
1336 | { | |
1337 | struct list_head *_p; | |
1338 | ||
1339 | (*pos)++; | |
1340 | ||
1341 | _p = v; | |
1342 | _p = (v == SEQ_START_TOKEN) ? nfs_volume_list.next : _p->next; | |
1343 | ||
1344 | return _p != &nfs_volume_list ? _p : NULL; | |
1345 | } | |
1346 | ||
1347 | /* | |
1348 | * clean up after reading from the transports list | |
1349 | */ | |
1350 | static void nfs_volume_list_stop(struct seq_file *p, void *v) | |
1351 | { | |
1352 | spin_unlock(&nfs_client_lock); | |
1353 | } | |
1354 | ||
1355 | /* | |
1356 | * display a header line followed by a load of call lines | |
1357 | */ | |
1358 | static int nfs_volume_list_show(struct seq_file *m, void *v) | |
1359 | { | |
1360 | struct nfs_server *server; | |
1361 | struct nfs_client *clp; | |
1362 | char dev[8], fsid[17]; | |
1363 | ||
1364 | /* display header on line 1 */ | |
1365 | if (v == SEQ_START_TOKEN) { | |
1366 | seq_puts(m, "NV SERVER PORT DEV FSID\n"); | |
1367 | return 0; | |
1368 | } | |
1369 | /* display one transport per line on subsequent lines */ | |
1370 | server = list_entry(v, struct nfs_server, master_link); | |
1371 | clp = server->nfs_client; | |
1372 | ||
1373 | snprintf(dev, 8, "%u:%u", | |
1374 | MAJOR(server->s_dev), MINOR(server->s_dev)); | |
1375 | ||
1376 | snprintf(fsid, 17, "%llx:%llx", | |
1377 | server->fsid.major, server->fsid.minor); | |
1378 | ||
1379 | seq_printf(m, "v%d %02x%02x%02x%02x %4hx %-7s %-17s\n", | |
1380 | clp->cl_nfsversion, | |
1381 | NIPQUAD(clp->cl_addr.sin_addr), | |
1382 | ntohs(clp->cl_addr.sin_port), | |
1383 | dev, | |
1384 | fsid); | |
1385 | ||
1386 | return 0; | |
1387 | } | |
1388 | ||
1389 | /* | |
1390 | * initialise the /proc/fs/nfsfs/ directory | |
1391 | */ | |
1392 | int __init nfs_fs_proc_init(void) | |
1393 | { | |
1394 | struct proc_dir_entry *p; | |
1395 | ||
1396 | proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs); | |
1397 | if (!proc_fs_nfs) | |
1398 | goto error_0; | |
1399 | ||
1400 | proc_fs_nfs->owner = THIS_MODULE; | |
1401 | ||
1402 | /* a file of servers with which we're dealing */ | |
1403 | p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs); | |
1404 | if (!p) | |
1405 | goto error_1; | |
1406 | ||
1407 | p->proc_fops = &nfs_server_list_fops; | |
1408 | p->owner = THIS_MODULE; | |
1409 | ||
1410 | /* a file of volumes that we have mounted */ | |
1411 | p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs); | |
1412 | if (!p) | |
1413 | goto error_2; | |
1414 | ||
1415 | p->proc_fops = &nfs_volume_list_fops; | |
1416 | p->owner = THIS_MODULE; | |
1417 | return 0; | |
1418 | ||
1419 | error_2: | |
1420 | remove_proc_entry("servers", proc_fs_nfs); | |
1421 | error_1: | |
1422 | remove_proc_entry("nfsfs", proc_root_fs); | |
1423 | error_0: | |
1424 | return -ENOMEM; | |
1425 | } | |
1426 | ||
1427 | /* | |
1428 | * clean up the /proc/fs/nfsfs/ directory | |
1429 | */ | |
1430 | void nfs_fs_proc_exit(void) | |
1431 | { | |
1432 | remove_proc_entry("volumes", proc_fs_nfs); | |
1433 | remove_proc_entry("servers", proc_fs_nfs); | |
1434 | remove_proc_entry("nfsfs", proc_root_fs); | |
1435 | } | |
1436 | ||
1437 | #endif /* CONFIG_PROC_FS */ |