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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/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/sched.h> | |
16 | #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> | |
26 | #include <linux/sunrpc/xprtsock.h> | |
27 | #include <linux/sunrpc/xprtrdma.h> | |
28 | #include <linux/nfs_fs.h> | |
29 | #include <linux/nfs_mount.h> | |
30 | #include <linux/nfs4_mount.h> | |
31 | #include <linux/lockd/bind.h> | |
32 | #include <linux/seq_file.h> | |
33 | #include <linux/mount.h> | |
34 | #include <linux/nfs_idmap.h> | |
35 | #include <linux/vfs.h> | |
36 | #include <linux/inet.h> | |
37 | #include <linux/in6.h> | |
38 | #include <linux/slab.h> | |
39 | #include <net/ipv6.h> | |
40 | #include <linux/nfs_xdr.h> | |
41 | #include <linux/sunrpc/bc_xprt.h> | |
42 | ||
43 | #include <asm/system.h> | |
44 | ||
45 | #include "nfs4_fs.h" | |
46 | #include "callback.h" | |
47 | #include "delegation.h" | |
48 | #include "iostat.h" | |
49 | #include "internal.h" | |
50 | #include "fscache.h" | |
51 | ||
52 | #define NFSDBG_FACILITY NFSDBG_CLIENT | |
53 | ||
54 | static DEFINE_SPINLOCK(nfs_client_lock); | |
55 | static LIST_HEAD(nfs_client_list); | |
56 | static LIST_HEAD(nfs_volume_list); | |
57 | static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); | |
58 | ||
59 | /* | |
60 | * RPC cruft for NFS | |
61 | */ | |
62 | static struct rpc_version *nfs_version[5] = { | |
63 | [2] = &nfs_version2, | |
64 | #ifdef CONFIG_NFS_V3 | |
65 | [3] = &nfs_version3, | |
66 | #endif | |
67 | #ifdef CONFIG_NFS_V4 | |
68 | [4] = &nfs_version4, | |
69 | #endif | |
70 | }; | |
71 | ||
72 | struct rpc_program nfs_program = { | |
73 | .name = "nfs", | |
74 | .number = NFS_PROGRAM, | |
75 | .nrvers = ARRAY_SIZE(nfs_version), | |
76 | .version = nfs_version, | |
77 | .stats = &nfs_rpcstat, | |
78 | .pipe_dir_name = "/nfs", | |
79 | }; | |
80 | ||
81 | struct rpc_stat nfs_rpcstat = { | |
82 | .program = &nfs_program | |
83 | }; | |
84 | ||
85 | ||
86 | #ifdef CONFIG_NFS_V3_ACL | |
87 | static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; | |
88 | static struct rpc_version * nfsacl_version[] = { | |
89 | [3] = &nfsacl_version3, | |
90 | }; | |
91 | ||
92 | struct rpc_program nfsacl_program = { | |
93 | .name = "nfsacl", | |
94 | .number = NFS_ACL_PROGRAM, | |
95 | .nrvers = ARRAY_SIZE(nfsacl_version), | |
96 | .version = nfsacl_version, | |
97 | .stats = &nfsacl_rpcstat, | |
98 | }; | |
99 | #endif /* CONFIG_NFS_V3_ACL */ | |
100 | ||
101 | struct nfs_client_initdata { | |
102 | const char *hostname; | |
103 | const struct sockaddr *addr; | |
104 | size_t addrlen; | |
105 | const struct nfs_rpc_ops *rpc_ops; | |
106 | int proto; | |
107 | u32 minorversion; | |
108 | }; | |
109 | ||
110 | /* | |
111 | * Allocate a shared client record | |
112 | * | |
113 | * Since these are allocated/deallocated very rarely, we don't | |
114 | * bother putting them in a slab cache... | |
115 | */ | |
116 | static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) | |
117 | { | |
118 | struct nfs_client *clp; | |
119 | struct rpc_cred *cred; | |
120 | int err = -ENOMEM; | |
121 | ||
122 | if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) | |
123 | goto error_0; | |
124 | ||
125 | clp->rpc_ops = cl_init->rpc_ops; | |
126 | ||
127 | atomic_set(&clp->cl_count, 1); | |
128 | clp->cl_cons_state = NFS_CS_INITING; | |
129 | ||
130 | memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); | |
131 | clp->cl_addrlen = cl_init->addrlen; | |
132 | ||
133 | if (cl_init->hostname) { | |
134 | err = -ENOMEM; | |
135 | clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); | |
136 | if (!clp->cl_hostname) | |
137 | goto error_cleanup; | |
138 | } | |
139 | ||
140 | INIT_LIST_HEAD(&clp->cl_superblocks); | |
141 | clp->cl_rpcclient = ERR_PTR(-EINVAL); | |
142 | ||
143 | clp->cl_proto = cl_init->proto; | |
144 | ||
145 | #ifdef CONFIG_NFS_V4 | |
146 | INIT_LIST_HEAD(&clp->cl_delegations); | |
147 | spin_lock_init(&clp->cl_lock); | |
148 | INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); | |
149 | rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); | |
150 | clp->cl_boot_time = CURRENT_TIME; | |
151 | clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; | |
152 | clp->cl_minorversion = cl_init->minorversion; | |
153 | #endif | |
154 | cred = rpc_lookup_machine_cred(); | |
155 | if (!IS_ERR(cred)) | |
156 | clp->cl_machine_cred = cred; | |
157 | ||
158 | nfs_fscache_get_client_cookie(clp); | |
159 | ||
160 | return clp; | |
161 | ||
162 | error_cleanup: | |
163 | kfree(clp); | |
164 | error_0: | |
165 | return ERR_PTR(err); | |
166 | } | |
167 | ||
168 | #ifdef CONFIG_NFS_V4 | |
169 | /* | |
170 | * Clears/puts all minor version specific parts from an nfs_client struct | |
171 | * reverting it to minorversion 0. | |
172 | */ | |
173 | static void nfs4_clear_client_minor_version(struct nfs_client *clp) | |
174 | { | |
175 | #ifdef CONFIG_NFS_V4_1 | |
176 | if (nfs4_has_session(clp)) { | |
177 | nfs4_destroy_session(clp->cl_session); | |
178 | clp->cl_session = NULL; | |
179 | } | |
180 | ||
181 | clp->cl_call_sync = _nfs4_call_sync; | |
182 | #endif /* CONFIG_NFS_V4_1 */ | |
183 | } | |
184 | ||
185 | /* | |
186 | * Destroy the NFS4 callback service | |
187 | */ | |
188 | static void nfs4_destroy_callback(struct nfs_client *clp) | |
189 | { | |
190 | if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) | |
191 | nfs_callback_down(clp->cl_minorversion); | |
192 | } | |
193 | ||
194 | static void nfs4_shutdown_client(struct nfs_client *clp) | |
195 | { | |
196 | if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) | |
197 | nfs4_kill_renewd(clp); | |
198 | nfs4_clear_client_minor_version(clp); | |
199 | nfs4_destroy_callback(clp); | |
200 | if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) | |
201 | nfs_idmap_delete(clp); | |
202 | ||
203 | rpc_destroy_wait_queue(&clp->cl_rpcwaitq); | |
204 | } | |
205 | #else | |
206 | static void nfs4_shutdown_client(struct nfs_client *clp) | |
207 | { | |
208 | } | |
209 | #endif /* CONFIG_NFS_V4 */ | |
210 | ||
211 | /* | |
212 | * Destroy a shared client record | |
213 | */ | |
214 | static void nfs_free_client(struct nfs_client *clp) | |
215 | { | |
216 | dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); | |
217 | ||
218 | nfs4_shutdown_client(clp); | |
219 | ||
220 | nfs_fscache_release_client_cookie(clp); | |
221 | ||
222 | /* -EIO all pending I/O */ | |
223 | if (!IS_ERR(clp->cl_rpcclient)) | |
224 | rpc_shutdown_client(clp->cl_rpcclient); | |
225 | ||
226 | if (clp->cl_machine_cred != NULL) | |
227 | put_rpccred(clp->cl_machine_cred); | |
228 | ||
229 | kfree(clp->cl_hostname); | |
230 | kfree(clp); | |
231 | ||
232 | dprintk("<-- nfs_free_client()\n"); | |
233 | } | |
234 | ||
235 | /* | |
236 | * Release a reference to a shared client record | |
237 | */ | |
238 | void nfs_put_client(struct nfs_client *clp) | |
239 | { | |
240 | if (!clp) | |
241 | return; | |
242 | ||
243 | dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); | |
244 | ||
245 | if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { | |
246 | list_del(&clp->cl_share_link); | |
247 | spin_unlock(&nfs_client_lock); | |
248 | ||
249 | BUG_ON(!list_empty(&clp->cl_superblocks)); | |
250 | ||
251 | nfs_free_client(clp); | |
252 | } | |
253 | } | |
254 | ||
255 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
256 | /* | |
257 | * Test if two ip6 socket addresses refer to the same socket by | |
258 | * comparing relevant fields. The padding bytes specifically, are not | |
259 | * compared. sin6_flowinfo is not compared because it only affects QoS | |
260 | * and sin6_scope_id is only compared if the address is "link local" | |
261 | * because "link local" addresses need only be unique to a specific | |
262 | * link. Conversely, ordinary unicast addresses might have different | |
263 | * sin6_scope_id. | |
264 | * | |
265 | * The caller should ensure both socket addresses are AF_INET6. | |
266 | */ | |
267 | static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, | |
268 | const struct sockaddr *sa2) | |
269 | { | |
270 | const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; | |
271 | const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; | |
272 | ||
273 | if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL && | |
274 | sin1->sin6_scope_id != sin2->sin6_scope_id) | |
275 | return 0; | |
276 | ||
277 | return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr); | |
278 | } | |
279 | #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ | |
280 | static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, | |
281 | const struct sockaddr *sa2) | |
282 | { | |
283 | return 0; | |
284 | } | |
285 | #endif | |
286 | ||
287 | /* | |
288 | * Test if two ip4 socket addresses refer to the same socket, by | |
289 | * comparing relevant fields. The padding bytes specifically, are | |
290 | * not compared. | |
291 | * | |
292 | * The caller should ensure both socket addresses are AF_INET. | |
293 | */ | |
294 | static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, | |
295 | const struct sockaddr *sa2) | |
296 | { | |
297 | const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; | |
298 | const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; | |
299 | ||
300 | return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; | |
301 | } | |
302 | ||
303 | static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, | |
304 | const struct sockaddr *sa2) | |
305 | { | |
306 | const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; | |
307 | const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; | |
308 | ||
309 | return nfs_sockaddr_match_ipaddr6(sa1, sa2) && | |
310 | (sin1->sin6_port == sin2->sin6_port); | |
311 | } | |
312 | ||
313 | static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, | |
314 | const struct sockaddr *sa2) | |
315 | { | |
316 | const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; | |
317 | const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; | |
318 | ||
319 | return nfs_sockaddr_match_ipaddr4(sa1, sa2) && | |
320 | (sin1->sin_port == sin2->sin_port); | |
321 | } | |
322 | ||
323 | /* | |
324 | * Test if two socket addresses represent the same actual socket, | |
325 | * by comparing (only) relevant fields, excluding the port number. | |
326 | */ | |
327 | static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, | |
328 | const struct sockaddr *sa2) | |
329 | { | |
330 | if (sa1->sa_family != sa2->sa_family) | |
331 | return 0; | |
332 | ||
333 | switch (sa1->sa_family) { | |
334 | case AF_INET: | |
335 | return nfs_sockaddr_match_ipaddr4(sa1, sa2); | |
336 | case AF_INET6: | |
337 | return nfs_sockaddr_match_ipaddr6(sa1, sa2); | |
338 | } | |
339 | return 0; | |
340 | } | |
341 | ||
342 | /* | |
343 | * Test if two socket addresses represent the same actual socket, | |
344 | * by comparing (only) relevant fields, including the port number. | |
345 | */ | |
346 | static int nfs_sockaddr_cmp(const struct sockaddr *sa1, | |
347 | const struct sockaddr *sa2) | |
348 | { | |
349 | if (sa1->sa_family != sa2->sa_family) | |
350 | return 0; | |
351 | ||
352 | switch (sa1->sa_family) { | |
353 | case AF_INET: | |
354 | return nfs_sockaddr_cmp_ip4(sa1, sa2); | |
355 | case AF_INET6: | |
356 | return nfs_sockaddr_cmp_ip6(sa1, sa2); | |
357 | } | |
358 | return 0; | |
359 | } | |
360 | ||
361 | /* | |
362 | * Find a client by IP address and protocol version | |
363 | * - returns NULL if no such client | |
364 | */ | |
365 | struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion) | |
366 | { | |
367 | struct nfs_client *clp; | |
368 | ||
369 | spin_lock(&nfs_client_lock); | |
370 | list_for_each_entry(clp, &nfs_client_list, cl_share_link) { | |
371 | struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; | |
372 | ||
373 | /* Don't match clients that failed to initialise properly */ | |
374 | if (!(clp->cl_cons_state == NFS_CS_READY || | |
375 | clp->cl_cons_state == NFS_CS_SESSION_INITING)) | |
376 | continue; | |
377 | ||
378 | /* Different NFS versions cannot share the same nfs_client */ | |
379 | if (clp->rpc_ops->version != nfsversion) | |
380 | continue; | |
381 | ||
382 | /* Match only the IP address, not the port number */ | |
383 | if (!nfs_sockaddr_match_ipaddr(addr, clap)) | |
384 | continue; | |
385 | ||
386 | atomic_inc(&clp->cl_count); | |
387 | spin_unlock(&nfs_client_lock); | |
388 | return clp; | |
389 | } | |
390 | spin_unlock(&nfs_client_lock); | |
391 | return NULL; | |
392 | } | |
393 | ||
394 | /* | |
395 | * Find a client by IP address and protocol version | |
396 | * - returns NULL if no such client | |
397 | */ | |
398 | struct nfs_client *nfs_find_client_next(struct nfs_client *clp) | |
399 | { | |
400 | struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr; | |
401 | u32 nfsvers = clp->rpc_ops->version; | |
402 | ||
403 | spin_lock(&nfs_client_lock); | |
404 | list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) { | |
405 | struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; | |
406 | ||
407 | /* Don't match clients that failed to initialise properly */ | |
408 | if (clp->cl_cons_state != NFS_CS_READY) | |
409 | continue; | |
410 | ||
411 | /* Different NFS versions cannot share the same nfs_client */ | |
412 | if (clp->rpc_ops->version != nfsvers) | |
413 | continue; | |
414 | ||
415 | /* Match only the IP address, not the port number */ | |
416 | if (!nfs_sockaddr_match_ipaddr(sap, clap)) | |
417 | continue; | |
418 | ||
419 | atomic_inc(&clp->cl_count); | |
420 | spin_unlock(&nfs_client_lock); | |
421 | return clp; | |
422 | } | |
423 | spin_unlock(&nfs_client_lock); | |
424 | return NULL; | |
425 | } | |
426 | ||
427 | /* | |
428 | * Find an nfs_client on the list that matches the initialisation data | |
429 | * that is supplied. | |
430 | */ | |
431 | static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) | |
432 | { | |
433 | struct nfs_client *clp; | |
434 | const struct sockaddr *sap = data->addr; | |
435 | ||
436 | list_for_each_entry(clp, &nfs_client_list, cl_share_link) { | |
437 | const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; | |
438 | /* Don't match clients that failed to initialise properly */ | |
439 | if (clp->cl_cons_state < 0) | |
440 | continue; | |
441 | ||
442 | /* Different NFS versions cannot share the same nfs_client */ | |
443 | if (clp->rpc_ops != data->rpc_ops) | |
444 | continue; | |
445 | ||
446 | if (clp->cl_proto != data->proto) | |
447 | continue; | |
448 | /* Match nfsv4 minorversion */ | |
449 | if (clp->cl_minorversion != data->minorversion) | |
450 | continue; | |
451 | /* Match the full socket address */ | |
452 | if (!nfs_sockaddr_cmp(sap, clap)) | |
453 | continue; | |
454 | ||
455 | atomic_inc(&clp->cl_count); | |
456 | return clp; | |
457 | } | |
458 | return NULL; | |
459 | } | |
460 | ||
461 | /* | |
462 | * Look up a client by IP address and protocol version | |
463 | * - creates a new record if one doesn't yet exist | |
464 | */ | |
465 | static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) | |
466 | { | |
467 | struct nfs_client *clp, *new = NULL; | |
468 | int error; | |
469 | ||
470 | dprintk("--> nfs_get_client(%s,v%u)\n", | |
471 | cl_init->hostname ?: "", cl_init->rpc_ops->version); | |
472 | ||
473 | /* see if the client already exists */ | |
474 | do { | |
475 | spin_lock(&nfs_client_lock); | |
476 | ||
477 | clp = nfs_match_client(cl_init); | |
478 | if (clp) | |
479 | goto found_client; | |
480 | if (new) | |
481 | goto install_client; | |
482 | ||
483 | spin_unlock(&nfs_client_lock); | |
484 | ||
485 | new = nfs_alloc_client(cl_init); | |
486 | } while (!IS_ERR(new)); | |
487 | ||
488 | dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new)); | |
489 | return new; | |
490 | ||
491 | /* install a new client and return with it unready */ | |
492 | install_client: | |
493 | clp = new; | |
494 | list_add(&clp->cl_share_link, &nfs_client_list); | |
495 | spin_unlock(&nfs_client_lock); | |
496 | dprintk("--> nfs_get_client() = %p [new]\n", clp); | |
497 | return clp; | |
498 | ||
499 | /* found an existing client | |
500 | * - make sure it's ready before returning | |
501 | */ | |
502 | found_client: | |
503 | spin_unlock(&nfs_client_lock); | |
504 | ||
505 | if (new) | |
506 | nfs_free_client(new); | |
507 | ||
508 | error = wait_event_killable(nfs_client_active_wq, | |
509 | clp->cl_cons_state < NFS_CS_INITING); | |
510 | if (error < 0) { | |
511 | nfs_put_client(clp); | |
512 | return ERR_PTR(-ERESTARTSYS); | |
513 | } | |
514 | ||
515 | if (clp->cl_cons_state < NFS_CS_READY) { | |
516 | error = clp->cl_cons_state; | |
517 | nfs_put_client(clp); | |
518 | return ERR_PTR(error); | |
519 | } | |
520 | ||
521 | BUG_ON(clp->cl_cons_state != NFS_CS_READY); | |
522 | ||
523 | dprintk("--> nfs_get_client() = %p [share]\n", clp); | |
524 | return clp; | |
525 | } | |
526 | ||
527 | /* | |
528 | * Mark a server as ready or failed | |
529 | */ | |
530 | void nfs_mark_client_ready(struct nfs_client *clp, int state) | |
531 | { | |
532 | clp->cl_cons_state = state; | |
533 | wake_up_all(&nfs_client_active_wq); | |
534 | } | |
535 | ||
536 | /* | |
537 | * With sessions, the client is not marked ready until after a | |
538 | * successful EXCHANGE_ID and CREATE_SESSION. | |
539 | * | |
540 | * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate | |
541 | * other versions of NFS can be tried. | |
542 | */ | |
543 | int nfs4_check_client_ready(struct nfs_client *clp) | |
544 | { | |
545 | if (!nfs4_has_session(clp)) | |
546 | return 0; | |
547 | if (clp->cl_cons_state < NFS_CS_READY) | |
548 | return -EPROTONOSUPPORT; | |
549 | return 0; | |
550 | } | |
551 | ||
552 | /* | |
553 | * Initialise the timeout values for a connection | |
554 | */ | |
555 | static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, | |
556 | unsigned int timeo, unsigned int retrans) | |
557 | { | |
558 | to->to_initval = timeo * HZ / 10; | |
559 | to->to_retries = retrans; | |
560 | ||
561 | switch (proto) { | |
562 | case XPRT_TRANSPORT_TCP: | |
563 | case XPRT_TRANSPORT_RDMA: | |
564 | if (to->to_retries == 0) | |
565 | to->to_retries = NFS_DEF_TCP_RETRANS; | |
566 | if (to->to_initval == 0) | |
567 | to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; | |
568 | if (to->to_initval > NFS_MAX_TCP_TIMEOUT) | |
569 | to->to_initval = NFS_MAX_TCP_TIMEOUT; | |
570 | to->to_increment = to->to_initval; | |
571 | to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); | |
572 | if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) | |
573 | to->to_maxval = NFS_MAX_TCP_TIMEOUT; | |
574 | if (to->to_maxval < to->to_initval) | |
575 | to->to_maxval = to->to_initval; | |
576 | to->to_exponential = 0; | |
577 | break; | |
578 | case XPRT_TRANSPORT_UDP: | |
579 | if (to->to_retries == 0) | |
580 | to->to_retries = NFS_DEF_UDP_RETRANS; | |
581 | if (!to->to_initval) | |
582 | to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; | |
583 | if (to->to_initval > NFS_MAX_UDP_TIMEOUT) | |
584 | to->to_initval = NFS_MAX_UDP_TIMEOUT; | |
585 | to->to_maxval = NFS_MAX_UDP_TIMEOUT; | |
586 | to->to_exponential = 1; | |
587 | break; | |
588 | default: | |
589 | BUG(); | |
590 | } | |
591 | } | |
592 | ||
593 | /* | |
594 | * Create an RPC client handle | |
595 | */ | |
596 | static int nfs_create_rpc_client(struct nfs_client *clp, | |
597 | const struct rpc_timeout *timeparms, | |
598 | rpc_authflavor_t flavor, | |
599 | int discrtry, int noresvport) | |
600 | { | |
601 | struct rpc_clnt *clnt = NULL; | |
602 | struct rpc_create_args args = { | |
603 | .protocol = clp->cl_proto, | |
604 | .address = (struct sockaddr *)&clp->cl_addr, | |
605 | .addrsize = clp->cl_addrlen, | |
606 | .timeout = timeparms, | |
607 | .servername = clp->cl_hostname, | |
608 | .program = &nfs_program, | |
609 | .version = clp->rpc_ops->version, | |
610 | .authflavor = flavor, | |
611 | }; | |
612 | ||
613 | if (discrtry) | |
614 | args.flags |= RPC_CLNT_CREATE_DISCRTRY; | |
615 | if (noresvport) | |
616 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; | |
617 | ||
618 | if (!IS_ERR(clp->cl_rpcclient)) | |
619 | return 0; | |
620 | ||
621 | clnt = rpc_create(&args); | |
622 | if (IS_ERR(clnt)) { | |
623 | dprintk("%s: cannot create RPC client. Error = %ld\n", | |
624 | __func__, PTR_ERR(clnt)); | |
625 | return PTR_ERR(clnt); | |
626 | } | |
627 | ||
628 | clp->cl_rpcclient = clnt; | |
629 | return 0; | |
630 | } | |
631 | ||
632 | /* | |
633 | * Version 2 or 3 client destruction | |
634 | */ | |
635 | static void nfs_destroy_server(struct nfs_server *server) | |
636 | { | |
637 | if (!(server->flags & NFS_MOUNT_NONLM)) | |
638 | nlmclnt_done(server->nlm_host); | |
639 | } | |
640 | ||
641 | /* | |
642 | * Version 2 or 3 lockd setup | |
643 | */ | |
644 | static int nfs_start_lockd(struct nfs_server *server) | |
645 | { | |
646 | struct nlm_host *host; | |
647 | struct nfs_client *clp = server->nfs_client; | |
648 | struct nlmclnt_initdata nlm_init = { | |
649 | .hostname = clp->cl_hostname, | |
650 | .address = (struct sockaddr *)&clp->cl_addr, | |
651 | .addrlen = clp->cl_addrlen, | |
652 | .nfs_version = clp->rpc_ops->version, | |
653 | .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? | |
654 | 1 : 0, | |
655 | }; | |
656 | ||
657 | if (nlm_init.nfs_version > 3) | |
658 | return 0; | |
659 | if (server->flags & NFS_MOUNT_NONLM) | |
660 | return 0; | |
661 | ||
662 | switch (clp->cl_proto) { | |
663 | default: | |
664 | nlm_init.protocol = IPPROTO_TCP; | |
665 | break; | |
666 | case XPRT_TRANSPORT_UDP: | |
667 | nlm_init.protocol = IPPROTO_UDP; | |
668 | } | |
669 | ||
670 | host = nlmclnt_init(&nlm_init); | |
671 | if (IS_ERR(host)) | |
672 | return PTR_ERR(host); | |
673 | ||
674 | server->nlm_host = host; | |
675 | server->destroy = nfs_destroy_server; | |
676 | return 0; | |
677 | } | |
678 | ||
679 | /* | |
680 | * Initialise an NFSv3 ACL client connection | |
681 | */ | |
682 | #ifdef CONFIG_NFS_V3_ACL | |
683 | static void nfs_init_server_aclclient(struct nfs_server *server) | |
684 | { | |
685 | if (server->nfs_client->rpc_ops->version != 3) | |
686 | goto out_noacl; | |
687 | if (server->flags & NFS_MOUNT_NOACL) | |
688 | goto out_noacl; | |
689 | ||
690 | server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); | |
691 | if (IS_ERR(server->client_acl)) | |
692 | goto out_noacl; | |
693 | ||
694 | /* No errors! Assume that Sun nfsacls are supported */ | |
695 | server->caps |= NFS_CAP_ACLS; | |
696 | return; | |
697 | ||
698 | out_noacl: | |
699 | server->caps &= ~NFS_CAP_ACLS; | |
700 | } | |
701 | #else | |
702 | static inline void nfs_init_server_aclclient(struct nfs_server *server) | |
703 | { | |
704 | server->flags &= ~NFS_MOUNT_NOACL; | |
705 | server->caps &= ~NFS_CAP_ACLS; | |
706 | } | |
707 | #endif | |
708 | ||
709 | /* | |
710 | * Create a general RPC client | |
711 | */ | |
712 | static int nfs_init_server_rpcclient(struct nfs_server *server, | |
713 | const struct rpc_timeout *timeo, | |
714 | rpc_authflavor_t pseudoflavour) | |
715 | { | |
716 | struct nfs_client *clp = server->nfs_client; | |
717 | ||
718 | server->client = rpc_clone_client(clp->cl_rpcclient); | |
719 | if (IS_ERR(server->client)) { | |
720 | dprintk("%s: couldn't create rpc_client!\n", __func__); | |
721 | return PTR_ERR(server->client); | |
722 | } | |
723 | ||
724 | memcpy(&server->client->cl_timeout_default, | |
725 | timeo, | |
726 | sizeof(server->client->cl_timeout_default)); | |
727 | server->client->cl_timeout = &server->client->cl_timeout_default; | |
728 | ||
729 | if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { | |
730 | struct rpc_auth *auth; | |
731 | ||
732 | auth = rpcauth_create(pseudoflavour, server->client); | |
733 | if (IS_ERR(auth)) { | |
734 | dprintk("%s: couldn't create credcache!\n", __func__); | |
735 | return PTR_ERR(auth); | |
736 | } | |
737 | } | |
738 | server->client->cl_softrtry = 0; | |
739 | if (server->flags & NFS_MOUNT_SOFT) | |
740 | server->client->cl_softrtry = 1; | |
741 | ||
742 | return 0; | |
743 | } | |
744 | ||
745 | /* | |
746 | * Initialise an NFS2 or NFS3 client | |
747 | */ | |
748 | static int nfs_init_client(struct nfs_client *clp, | |
749 | const struct rpc_timeout *timeparms, | |
750 | const struct nfs_parsed_mount_data *data) | |
751 | { | |
752 | int error; | |
753 | ||
754 | if (clp->cl_cons_state == NFS_CS_READY) { | |
755 | /* the client is already initialised */ | |
756 | dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); | |
757 | return 0; | |
758 | } | |
759 | ||
760 | /* | |
761 | * Create a client RPC handle for doing FSSTAT with UNIX auth only | |
762 | * - RFC 2623, sec 2.3.2 | |
763 | */ | |
764 | error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, | |
765 | 0, data->flags & NFS_MOUNT_NORESVPORT); | |
766 | if (error < 0) | |
767 | goto error; | |
768 | nfs_mark_client_ready(clp, NFS_CS_READY); | |
769 | return 0; | |
770 | ||
771 | error: | |
772 | nfs_mark_client_ready(clp, error); | |
773 | dprintk("<-- nfs_init_client() = xerror %d\n", error); | |
774 | return error; | |
775 | } | |
776 | ||
777 | /* | |
778 | * Create a version 2 or 3 client | |
779 | */ | |
780 | static int nfs_init_server(struct nfs_server *server, | |
781 | const struct nfs_parsed_mount_data *data) | |
782 | { | |
783 | struct nfs_client_initdata cl_init = { | |
784 | .hostname = data->nfs_server.hostname, | |
785 | .addr = (const struct sockaddr *)&data->nfs_server.address, | |
786 | .addrlen = data->nfs_server.addrlen, | |
787 | .rpc_ops = &nfs_v2_clientops, | |
788 | .proto = data->nfs_server.protocol, | |
789 | }; | |
790 | struct rpc_timeout timeparms; | |
791 | struct nfs_client *clp; | |
792 | int error; | |
793 | ||
794 | dprintk("--> nfs_init_server()\n"); | |
795 | ||
796 | #ifdef CONFIG_NFS_V3 | |
797 | if (data->version == 3) | |
798 | cl_init.rpc_ops = &nfs_v3_clientops; | |
799 | #endif | |
800 | ||
801 | /* Allocate or find a client reference we can use */ | |
802 | clp = nfs_get_client(&cl_init); | |
803 | if (IS_ERR(clp)) { | |
804 | dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); | |
805 | return PTR_ERR(clp); | |
806 | } | |
807 | ||
808 | nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, | |
809 | data->timeo, data->retrans); | |
810 | error = nfs_init_client(clp, &timeparms, data); | |
811 | if (error < 0) | |
812 | goto error; | |
813 | ||
814 | server->nfs_client = clp; | |
815 | ||
816 | /* Initialise the client representation from the mount data */ | |
817 | server->flags = data->flags; | |
818 | server->options = data->options; | |
819 | server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| | |
820 | NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| | |
821 | NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; | |
822 | ||
823 | if (data->rsize) | |
824 | server->rsize = nfs_block_size(data->rsize, NULL); | |
825 | if (data->wsize) | |
826 | server->wsize = nfs_block_size(data->wsize, NULL); | |
827 | ||
828 | server->acregmin = data->acregmin * HZ; | |
829 | server->acregmax = data->acregmax * HZ; | |
830 | server->acdirmin = data->acdirmin * HZ; | |
831 | server->acdirmax = data->acdirmax * HZ; | |
832 | ||
833 | /* Start lockd here, before we might error out */ | |
834 | error = nfs_start_lockd(server); | |
835 | if (error < 0) | |
836 | goto error; | |
837 | ||
838 | server->port = data->nfs_server.port; | |
839 | ||
840 | error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); | |
841 | if (error < 0) | |
842 | goto error; | |
843 | ||
844 | /* Preserve the values of mount_server-related mount options */ | |
845 | if (data->mount_server.addrlen) { | |
846 | memcpy(&server->mountd_address, &data->mount_server.address, | |
847 | data->mount_server.addrlen); | |
848 | server->mountd_addrlen = data->mount_server.addrlen; | |
849 | } | |
850 | server->mountd_version = data->mount_server.version; | |
851 | server->mountd_port = data->mount_server.port; | |
852 | server->mountd_protocol = data->mount_server.protocol; | |
853 | ||
854 | server->namelen = data->namlen; | |
855 | /* Create a client RPC handle for the NFSv3 ACL management interface */ | |
856 | nfs_init_server_aclclient(server); | |
857 | dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); | |
858 | return 0; | |
859 | ||
860 | error: | |
861 | server->nfs_client = NULL; | |
862 | nfs_put_client(clp); | |
863 | dprintk("<-- nfs_init_server() = xerror %d\n", error); | |
864 | return error; | |
865 | } | |
866 | ||
867 | /* | |
868 | * Load up the server record from information gained in an fsinfo record | |
869 | */ | |
870 | static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) | |
871 | { | |
872 | unsigned long max_rpc_payload; | |
873 | ||
874 | /* Work out a lot of parameters */ | |
875 | if (server->rsize == 0) | |
876 | server->rsize = nfs_block_size(fsinfo->rtpref, NULL); | |
877 | if (server->wsize == 0) | |
878 | server->wsize = nfs_block_size(fsinfo->wtpref, NULL); | |
879 | ||
880 | if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) | |
881 | server->rsize = nfs_block_size(fsinfo->rtmax, NULL); | |
882 | if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) | |
883 | server->wsize = nfs_block_size(fsinfo->wtmax, NULL); | |
884 | ||
885 | max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); | |
886 | if (server->rsize > max_rpc_payload) | |
887 | server->rsize = max_rpc_payload; | |
888 | if (server->rsize > NFS_MAX_FILE_IO_SIZE) | |
889 | server->rsize = NFS_MAX_FILE_IO_SIZE; | |
890 | server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
891 | ||
892 | server->backing_dev_info.name = "nfs"; | |
893 | server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; | |
894 | ||
895 | if (server->wsize > max_rpc_payload) | |
896 | server->wsize = max_rpc_payload; | |
897 | if (server->wsize > NFS_MAX_FILE_IO_SIZE) | |
898 | server->wsize = NFS_MAX_FILE_IO_SIZE; | |
899 | server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
900 | server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); | |
901 | ||
902 | server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); | |
903 | if (server->dtsize > PAGE_CACHE_SIZE) | |
904 | server->dtsize = PAGE_CACHE_SIZE; | |
905 | if (server->dtsize > server->rsize) | |
906 | server->dtsize = server->rsize; | |
907 | ||
908 | if (server->flags & NFS_MOUNT_NOAC) { | |
909 | server->acregmin = server->acregmax = 0; | |
910 | server->acdirmin = server->acdirmax = 0; | |
911 | } | |
912 | ||
913 | server->maxfilesize = fsinfo->maxfilesize; | |
914 | ||
915 | /* We're airborne Set socket buffersize */ | |
916 | rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); | |
917 | } | |
918 | ||
919 | /* | |
920 | * Probe filesystem information, including the FSID on v2/v3 | |
921 | */ | |
922 | static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) | |
923 | { | |
924 | struct nfs_fsinfo fsinfo; | |
925 | struct nfs_client *clp = server->nfs_client; | |
926 | int error; | |
927 | ||
928 | dprintk("--> nfs_probe_fsinfo()\n"); | |
929 | ||
930 | if (clp->rpc_ops->set_capabilities != NULL) { | |
931 | error = clp->rpc_ops->set_capabilities(server, mntfh); | |
932 | if (error < 0) | |
933 | goto out_error; | |
934 | } | |
935 | ||
936 | fsinfo.fattr = fattr; | |
937 | error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); | |
938 | if (error < 0) | |
939 | goto out_error; | |
940 | ||
941 | nfs_server_set_fsinfo(server, &fsinfo); | |
942 | ||
943 | /* Get some general file system info */ | |
944 | if (server->namelen == 0) { | |
945 | struct nfs_pathconf pathinfo; | |
946 | ||
947 | pathinfo.fattr = fattr; | |
948 | nfs_fattr_init(fattr); | |
949 | ||
950 | if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) | |
951 | server->namelen = pathinfo.max_namelen; | |
952 | } | |
953 | ||
954 | dprintk("<-- nfs_probe_fsinfo() = 0\n"); | |
955 | return 0; | |
956 | ||
957 | out_error: | |
958 | dprintk("nfs_probe_fsinfo: error = %d\n", -error); | |
959 | return error; | |
960 | } | |
961 | ||
962 | /* | |
963 | * Copy useful information when duplicating a server record | |
964 | */ | |
965 | static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) | |
966 | { | |
967 | target->flags = source->flags; | |
968 | target->rsize = source->rsize; | |
969 | target->wsize = source->wsize; | |
970 | target->acregmin = source->acregmin; | |
971 | target->acregmax = source->acregmax; | |
972 | target->acdirmin = source->acdirmin; | |
973 | target->acdirmax = source->acdirmax; | |
974 | target->caps = source->caps; | |
975 | target->options = source->options; | |
976 | } | |
977 | ||
978 | /* | |
979 | * Allocate and initialise a server record | |
980 | */ | |
981 | static struct nfs_server *nfs_alloc_server(void) | |
982 | { | |
983 | struct nfs_server *server; | |
984 | ||
985 | server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); | |
986 | if (!server) | |
987 | return NULL; | |
988 | ||
989 | server->client = server->client_acl = ERR_PTR(-EINVAL); | |
990 | ||
991 | /* Zero out the NFS state stuff */ | |
992 | INIT_LIST_HEAD(&server->client_link); | |
993 | INIT_LIST_HEAD(&server->master_link); | |
994 | ||
995 | atomic_set(&server->active, 0); | |
996 | ||
997 | server->io_stats = nfs_alloc_iostats(); | |
998 | if (!server->io_stats) { | |
999 | kfree(server); | |
1000 | return NULL; | |
1001 | } | |
1002 | ||
1003 | if (bdi_init(&server->backing_dev_info)) { | |
1004 | nfs_free_iostats(server->io_stats); | |
1005 | kfree(server); | |
1006 | return NULL; | |
1007 | } | |
1008 | ||
1009 | return server; | |
1010 | } | |
1011 | ||
1012 | /* | |
1013 | * Free up a server record | |
1014 | */ | |
1015 | void nfs_free_server(struct nfs_server *server) | |
1016 | { | |
1017 | dprintk("--> nfs_free_server()\n"); | |
1018 | ||
1019 | spin_lock(&nfs_client_lock); | |
1020 | list_del(&server->client_link); | |
1021 | list_del(&server->master_link); | |
1022 | spin_unlock(&nfs_client_lock); | |
1023 | ||
1024 | if (server->destroy != NULL) | |
1025 | server->destroy(server); | |
1026 | ||
1027 | if (!IS_ERR(server->client_acl)) | |
1028 | rpc_shutdown_client(server->client_acl); | |
1029 | if (!IS_ERR(server->client)) | |
1030 | rpc_shutdown_client(server->client); | |
1031 | ||
1032 | nfs_put_client(server->nfs_client); | |
1033 | ||
1034 | nfs_free_iostats(server->io_stats); | |
1035 | bdi_destroy(&server->backing_dev_info); | |
1036 | kfree(server); | |
1037 | nfs_release_automount_timer(); | |
1038 | dprintk("<-- nfs_free_server()\n"); | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | * Create a version 2 or 3 volume record | |
1043 | * - keyed on server and FSID | |
1044 | */ | |
1045 | struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, | |
1046 | struct nfs_fh *mntfh) | |
1047 | { | |
1048 | struct nfs_server *server; | |
1049 | struct nfs_fattr *fattr; | |
1050 | int error; | |
1051 | ||
1052 | server = nfs_alloc_server(); | |
1053 | if (!server) | |
1054 | return ERR_PTR(-ENOMEM); | |
1055 | ||
1056 | error = -ENOMEM; | |
1057 | fattr = nfs_alloc_fattr(); | |
1058 | if (fattr == NULL) | |
1059 | goto error; | |
1060 | ||
1061 | /* Get a client representation */ | |
1062 | error = nfs_init_server(server, data); | |
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 root fh to retrieve its FSID */ | |
1071 | error = nfs_probe_fsinfo(server, mntfh, fattr); | |
1072 | if (error < 0) | |
1073 | goto error; | |
1074 | if (server->nfs_client->rpc_ops->version == 3) { | |
1075 | if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) | |
1076 | server->namelen = NFS3_MAXNAMLEN; | |
1077 | if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) | |
1078 | server->caps |= NFS_CAP_READDIRPLUS; | |
1079 | } else { | |
1080 | if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) | |
1081 | server->namelen = NFS2_MAXNAMLEN; | |
1082 | } | |
1083 | ||
1084 | if (!(fattr->valid & NFS_ATTR_FATTR)) { | |
1085 | error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr); | |
1086 | if (error < 0) { | |
1087 | dprintk("nfs_create_server: getattr error = %d\n", -error); | |
1088 | goto error; | |
1089 | } | |
1090 | } | |
1091 | memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); | |
1092 | ||
1093 | dprintk("Server FSID: %llx:%llx\n", | |
1094 | (unsigned long long) server->fsid.major, | |
1095 | (unsigned long long) server->fsid.minor); | |
1096 | ||
1097 | spin_lock(&nfs_client_lock); | |
1098 | list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); | |
1099 | list_add_tail(&server->master_link, &nfs_volume_list); | |
1100 | spin_unlock(&nfs_client_lock); | |
1101 | ||
1102 | server->mount_time = jiffies; | |
1103 | nfs_free_fattr(fattr); | |
1104 | return server; | |
1105 | ||
1106 | error: | |
1107 | nfs_free_fattr(fattr); | |
1108 | nfs_free_server(server); | |
1109 | return ERR_PTR(error); | |
1110 | } | |
1111 | ||
1112 | #ifdef CONFIG_NFS_V4 | |
1113 | /* | |
1114 | * Initialize the NFS4 callback service | |
1115 | */ | |
1116 | static int nfs4_init_callback(struct nfs_client *clp) | |
1117 | { | |
1118 | int error; | |
1119 | ||
1120 | if (clp->rpc_ops->version == 4) { | |
1121 | if (nfs4_has_session(clp)) { | |
1122 | error = xprt_setup_backchannel( | |
1123 | clp->cl_rpcclient->cl_xprt, | |
1124 | NFS41_BC_MIN_CALLBACKS); | |
1125 | if (error < 0) | |
1126 | return error; | |
1127 | } | |
1128 | ||
1129 | error = nfs_callback_up(clp->cl_minorversion, | |
1130 | clp->cl_rpcclient->cl_xprt); | |
1131 | if (error < 0) { | |
1132 | dprintk("%s: failed to start callback. Error = %d\n", | |
1133 | __func__, error); | |
1134 | return error; | |
1135 | } | |
1136 | __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); | |
1137 | } | |
1138 | return 0; | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * Initialize the minor version specific parts of an NFS4 client record | |
1143 | */ | |
1144 | static int nfs4_init_client_minor_version(struct nfs_client *clp) | |
1145 | { | |
1146 | clp->cl_call_sync = _nfs4_call_sync; | |
1147 | ||
1148 | #if defined(CONFIG_NFS_V4_1) | |
1149 | if (clp->cl_minorversion) { | |
1150 | struct nfs4_session *session = NULL; | |
1151 | /* | |
1152 | * Create the session and mark it expired. | |
1153 | * When a SEQUENCE operation encounters the expired session | |
1154 | * it will do session recovery to initialize it. | |
1155 | */ | |
1156 | session = nfs4_alloc_session(clp); | |
1157 | if (!session) | |
1158 | return -ENOMEM; | |
1159 | ||
1160 | clp->cl_session = session; | |
1161 | clp->cl_call_sync = _nfs4_call_sync_session; | |
1162 | } | |
1163 | #endif /* CONFIG_NFS_V4_1 */ | |
1164 | ||
1165 | return nfs4_init_callback(clp); | |
1166 | } | |
1167 | ||
1168 | /* | |
1169 | * Initialise an NFS4 client record | |
1170 | */ | |
1171 | static int nfs4_init_client(struct nfs_client *clp, | |
1172 | const struct rpc_timeout *timeparms, | |
1173 | const char *ip_addr, | |
1174 | rpc_authflavor_t authflavour, | |
1175 | int flags) | |
1176 | { | |
1177 | int error; | |
1178 | ||
1179 | if (clp->cl_cons_state == NFS_CS_READY) { | |
1180 | /* the client is initialised already */ | |
1181 | dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); | |
1182 | return 0; | |
1183 | } | |
1184 | ||
1185 | /* Check NFS protocol revision and initialize RPC op vector */ | |
1186 | clp->rpc_ops = &nfs_v4_clientops; | |
1187 | ||
1188 | error = nfs_create_rpc_client(clp, timeparms, authflavour, | |
1189 | 1, flags & NFS_MOUNT_NORESVPORT); | |
1190 | if (error < 0) | |
1191 | goto error; | |
1192 | strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); | |
1193 | ||
1194 | error = nfs_idmap_new(clp); | |
1195 | if (error < 0) { | |
1196 | dprintk("%s: failed to create idmapper. Error = %d\n", | |
1197 | __func__, error); | |
1198 | goto error; | |
1199 | } | |
1200 | __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); | |
1201 | ||
1202 | error = nfs4_init_client_minor_version(clp); | |
1203 | if (error < 0) | |
1204 | goto error; | |
1205 | ||
1206 | if (!nfs4_has_session(clp)) | |
1207 | nfs_mark_client_ready(clp, NFS_CS_READY); | |
1208 | return 0; | |
1209 | ||
1210 | error: | |
1211 | nfs_mark_client_ready(clp, error); | |
1212 | dprintk("<-- nfs4_init_client() = xerror %d\n", error); | |
1213 | return error; | |
1214 | } | |
1215 | ||
1216 | /* | |
1217 | * Set up an NFS4 client | |
1218 | */ | |
1219 | static int nfs4_set_client(struct nfs_server *server, | |
1220 | const char *hostname, | |
1221 | const struct sockaddr *addr, | |
1222 | const size_t addrlen, | |
1223 | const char *ip_addr, | |
1224 | rpc_authflavor_t authflavour, | |
1225 | int proto, const struct rpc_timeout *timeparms, | |
1226 | u32 minorversion) | |
1227 | { | |
1228 | struct nfs_client_initdata cl_init = { | |
1229 | .hostname = hostname, | |
1230 | .addr = addr, | |
1231 | .addrlen = addrlen, | |
1232 | .rpc_ops = &nfs_v4_clientops, | |
1233 | .proto = proto, | |
1234 | .minorversion = minorversion, | |
1235 | }; | |
1236 | struct nfs_client *clp; | |
1237 | int error; | |
1238 | ||
1239 | dprintk("--> nfs4_set_client()\n"); | |
1240 | ||
1241 | /* Allocate or find a client reference we can use */ | |
1242 | clp = nfs_get_client(&cl_init); | |
1243 | if (IS_ERR(clp)) { | |
1244 | error = PTR_ERR(clp); | |
1245 | goto error; | |
1246 | } | |
1247 | error = nfs4_init_client(clp, timeparms, ip_addr, authflavour, | |
1248 | server->flags); | |
1249 | if (error < 0) | |
1250 | goto error_put; | |
1251 | ||
1252 | server->nfs_client = clp; | |
1253 | dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); | |
1254 | return 0; | |
1255 | ||
1256 | error_put: | |
1257 | nfs_put_client(clp); | |
1258 | error: | |
1259 | dprintk("<-- nfs4_set_client() = xerror %d\n", error); | |
1260 | return error; | |
1261 | } | |
1262 | ||
1263 | ||
1264 | /* | |
1265 | * Session has been established, and the client marked ready. | |
1266 | * Set the mount rsize and wsize with negotiated fore channel | |
1267 | * attributes which will be bound checked in nfs_server_set_fsinfo. | |
1268 | */ | |
1269 | static void nfs4_session_set_rwsize(struct nfs_server *server) | |
1270 | { | |
1271 | #ifdef CONFIG_NFS_V4_1 | |
1272 | struct nfs4_session *sess; | |
1273 | u32 server_resp_sz; | |
1274 | u32 server_rqst_sz; | |
1275 | ||
1276 | if (!nfs4_has_session(server->nfs_client)) | |
1277 | return; | |
1278 | sess = server->nfs_client->cl_session; | |
1279 | server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; | |
1280 | server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; | |
1281 | ||
1282 | if (server->rsize > server_resp_sz) | |
1283 | server->rsize = server_resp_sz; | |
1284 | if (server->wsize > server_rqst_sz) | |
1285 | server->wsize = server_rqst_sz; | |
1286 | #endif /* CONFIG_NFS_V4_1 */ | |
1287 | } | |
1288 | ||
1289 | /* | |
1290 | * Create a version 4 volume record | |
1291 | */ | |
1292 | static int nfs4_init_server(struct nfs_server *server, | |
1293 | const struct nfs_parsed_mount_data *data) | |
1294 | { | |
1295 | struct rpc_timeout timeparms; | |
1296 | int error; | |
1297 | ||
1298 | dprintk("--> nfs4_init_server()\n"); | |
1299 | ||
1300 | nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, | |
1301 | data->timeo, data->retrans); | |
1302 | ||
1303 | /* Initialise the client representation from the mount data */ | |
1304 | server->flags = data->flags; | |
1305 | server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR| | |
1306 | NFS_CAP_POSIX_LOCK; | |
1307 | server->options = data->options; | |
1308 | ||
1309 | /* Get a client record */ | |
1310 | error = nfs4_set_client(server, | |
1311 | data->nfs_server.hostname, | |
1312 | (const struct sockaddr *)&data->nfs_server.address, | |
1313 | data->nfs_server.addrlen, | |
1314 | data->client_address, | |
1315 | data->auth_flavors[0], | |
1316 | data->nfs_server.protocol, | |
1317 | &timeparms, | |
1318 | data->minorversion); | |
1319 | if (error < 0) | |
1320 | goto error; | |
1321 | ||
1322 | if (data->rsize) | |
1323 | server->rsize = nfs_block_size(data->rsize, NULL); | |
1324 | if (data->wsize) | |
1325 | server->wsize = nfs_block_size(data->wsize, NULL); | |
1326 | ||
1327 | server->acregmin = data->acregmin * HZ; | |
1328 | server->acregmax = data->acregmax * HZ; | |
1329 | server->acdirmin = data->acdirmin * HZ; | |
1330 | server->acdirmax = data->acdirmax * HZ; | |
1331 | ||
1332 | server->port = data->nfs_server.port; | |
1333 | ||
1334 | error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); | |
1335 | ||
1336 | error: | |
1337 | /* Done */ | |
1338 | dprintk("<-- nfs4_init_server() = %d\n", error); | |
1339 | return error; | |
1340 | } | |
1341 | ||
1342 | /* | |
1343 | * Create a version 4 volume record | |
1344 | * - keyed on server and FSID | |
1345 | */ | |
1346 | struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, | |
1347 | struct nfs_fh *mntfh) | |
1348 | { | |
1349 | struct nfs_fattr *fattr; | |
1350 | struct nfs_server *server; | |
1351 | int error; | |
1352 | ||
1353 | dprintk("--> nfs4_create_server()\n"); | |
1354 | ||
1355 | server = nfs_alloc_server(); | |
1356 | if (!server) | |
1357 | return ERR_PTR(-ENOMEM); | |
1358 | ||
1359 | error = -ENOMEM; | |
1360 | fattr = nfs_alloc_fattr(); | |
1361 | if (fattr == NULL) | |
1362 | goto error; | |
1363 | ||
1364 | /* set up the general RPC client */ | |
1365 | error = nfs4_init_server(server, data); | |
1366 | if (error < 0) | |
1367 | goto error; | |
1368 | ||
1369 | BUG_ON(!server->nfs_client); | |
1370 | BUG_ON(!server->nfs_client->rpc_ops); | |
1371 | BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); | |
1372 | ||
1373 | error = nfs4_init_session(server); | |
1374 | if (error < 0) | |
1375 | goto error; | |
1376 | ||
1377 | /* Probe the root fh to retrieve its FSID */ | |
1378 | error = nfs4_get_rootfh(server, mntfh); | |
1379 | if (error < 0) | |
1380 | goto error; | |
1381 | ||
1382 | dprintk("Server FSID: %llx:%llx\n", | |
1383 | (unsigned long long) server->fsid.major, | |
1384 | (unsigned long long) server->fsid.minor); | |
1385 | dprintk("Mount FH: %d\n", mntfh->size); | |
1386 | ||
1387 | nfs4_session_set_rwsize(server); | |
1388 | ||
1389 | error = nfs_probe_fsinfo(server, mntfh, fattr); | |
1390 | if (error < 0) | |
1391 | goto error; | |
1392 | ||
1393 | if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) | |
1394 | server->namelen = NFS4_MAXNAMLEN; | |
1395 | ||
1396 | spin_lock(&nfs_client_lock); | |
1397 | list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); | |
1398 | list_add_tail(&server->master_link, &nfs_volume_list); | |
1399 | spin_unlock(&nfs_client_lock); | |
1400 | ||
1401 | server->mount_time = jiffies; | |
1402 | dprintk("<-- nfs4_create_server() = %p\n", server); | |
1403 | nfs_free_fattr(fattr); | |
1404 | return server; | |
1405 | ||
1406 | error: | |
1407 | nfs_free_fattr(fattr); | |
1408 | nfs_free_server(server); | |
1409 | dprintk("<-- nfs4_create_server() = error %d\n", error); | |
1410 | return ERR_PTR(error); | |
1411 | } | |
1412 | ||
1413 | /* | |
1414 | * Create an NFS4 referral server record | |
1415 | */ | |
1416 | struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, | |
1417 | struct nfs_fh *mntfh) | |
1418 | { | |
1419 | struct nfs_client *parent_client; | |
1420 | struct nfs_server *server, *parent_server; | |
1421 | struct nfs_fattr *fattr; | |
1422 | int error; | |
1423 | ||
1424 | dprintk("--> nfs4_create_referral_server()\n"); | |
1425 | ||
1426 | server = nfs_alloc_server(); | |
1427 | if (!server) | |
1428 | return ERR_PTR(-ENOMEM); | |
1429 | ||
1430 | error = -ENOMEM; | |
1431 | fattr = nfs_alloc_fattr(); | |
1432 | if (fattr == NULL) | |
1433 | goto error; | |
1434 | ||
1435 | parent_server = NFS_SB(data->sb); | |
1436 | parent_client = parent_server->nfs_client; | |
1437 | ||
1438 | /* Initialise the client representation from the parent server */ | |
1439 | nfs_server_copy_userdata(server, parent_server); | |
1440 | server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; | |
1441 | ||
1442 | /* Get a client representation. | |
1443 | * Note: NFSv4 always uses TCP, */ | |
1444 | error = nfs4_set_client(server, data->hostname, | |
1445 | data->addr, | |
1446 | data->addrlen, | |
1447 | parent_client->cl_ipaddr, | |
1448 | data->authflavor, | |
1449 | parent_server->client->cl_xprt->prot, | |
1450 | parent_server->client->cl_timeout, | |
1451 | parent_client->cl_minorversion); | |
1452 | if (error < 0) | |
1453 | goto error; | |
1454 | ||
1455 | error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); | |
1456 | if (error < 0) | |
1457 | goto error; | |
1458 | ||
1459 | BUG_ON(!server->nfs_client); | |
1460 | BUG_ON(!server->nfs_client->rpc_ops); | |
1461 | BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); | |
1462 | ||
1463 | /* Probe the root fh to retrieve its FSID and filehandle */ | |
1464 | error = nfs4_get_rootfh(server, mntfh); | |
1465 | if (error < 0) | |
1466 | goto error; | |
1467 | ||
1468 | /* probe the filesystem info for this server filesystem */ | |
1469 | error = nfs_probe_fsinfo(server, mntfh, fattr); | |
1470 | if (error < 0) | |
1471 | goto error; | |
1472 | ||
1473 | if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) | |
1474 | server->namelen = NFS4_MAXNAMLEN; | |
1475 | ||
1476 | dprintk("Referral FSID: %llx:%llx\n", | |
1477 | (unsigned long long) server->fsid.major, | |
1478 | (unsigned long long) server->fsid.minor); | |
1479 | ||
1480 | spin_lock(&nfs_client_lock); | |
1481 | list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); | |
1482 | list_add_tail(&server->master_link, &nfs_volume_list); | |
1483 | spin_unlock(&nfs_client_lock); | |
1484 | ||
1485 | server->mount_time = jiffies; | |
1486 | ||
1487 | nfs_free_fattr(fattr); | |
1488 | dprintk("<-- nfs_create_referral_server() = %p\n", server); | |
1489 | return server; | |
1490 | ||
1491 | error: | |
1492 | nfs_free_fattr(fattr); | |
1493 | nfs_free_server(server); | |
1494 | dprintk("<-- nfs4_create_referral_server() = error %d\n", error); | |
1495 | return ERR_PTR(error); | |
1496 | } | |
1497 | ||
1498 | #endif /* CONFIG_NFS_V4 */ | |
1499 | ||
1500 | /* | |
1501 | * Clone an NFS2, NFS3 or NFS4 server record | |
1502 | */ | |
1503 | struct nfs_server *nfs_clone_server(struct nfs_server *source, | |
1504 | struct nfs_fh *fh, | |
1505 | struct nfs_fattr *fattr) | |
1506 | { | |
1507 | struct nfs_server *server; | |
1508 | struct nfs_fattr *fattr_fsinfo; | |
1509 | int error; | |
1510 | ||
1511 | dprintk("--> nfs_clone_server(,%llx:%llx,)\n", | |
1512 | (unsigned long long) fattr->fsid.major, | |
1513 | (unsigned long long) fattr->fsid.minor); | |
1514 | ||
1515 | server = nfs_alloc_server(); | |
1516 | if (!server) | |
1517 | return ERR_PTR(-ENOMEM); | |
1518 | ||
1519 | error = -ENOMEM; | |
1520 | fattr_fsinfo = nfs_alloc_fattr(); | |
1521 | if (fattr_fsinfo == NULL) | |
1522 | goto out_free_server; | |
1523 | ||
1524 | /* Copy data from the source */ | |
1525 | server->nfs_client = source->nfs_client; | |
1526 | atomic_inc(&server->nfs_client->cl_count); | |
1527 | nfs_server_copy_userdata(server, source); | |
1528 | ||
1529 | server->fsid = fattr->fsid; | |
1530 | ||
1531 | error = nfs_init_server_rpcclient(server, | |
1532 | source->client->cl_timeout, | |
1533 | source->client->cl_auth->au_flavor); | |
1534 | if (error < 0) | |
1535 | goto out_free_server; | |
1536 | if (!IS_ERR(source->client_acl)) | |
1537 | nfs_init_server_aclclient(server); | |
1538 | ||
1539 | /* probe the filesystem info for this server filesystem */ | |
1540 | error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); | |
1541 | if (error < 0) | |
1542 | goto out_free_server; | |
1543 | ||
1544 | if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) | |
1545 | server->namelen = NFS4_MAXNAMLEN; | |
1546 | ||
1547 | dprintk("Cloned FSID: %llx:%llx\n", | |
1548 | (unsigned long long) server->fsid.major, | |
1549 | (unsigned long long) server->fsid.minor); | |
1550 | ||
1551 | error = nfs_start_lockd(server); | |
1552 | if (error < 0) | |
1553 | goto out_free_server; | |
1554 | ||
1555 | spin_lock(&nfs_client_lock); | |
1556 | list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); | |
1557 | list_add_tail(&server->master_link, &nfs_volume_list); | |
1558 | spin_unlock(&nfs_client_lock); | |
1559 | ||
1560 | server->mount_time = jiffies; | |
1561 | ||
1562 | nfs_free_fattr(fattr_fsinfo); | |
1563 | dprintk("<-- nfs_clone_server() = %p\n", server); | |
1564 | return server; | |
1565 | ||
1566 | out_free_server: | |
1567 | nfs_free_fattr(fattr_fsinfo); | |
1568 | nfs_free_server(server); | |
1569 | dprintk("<-- nfs_clone_server() = error %d\n", error); | |
1570 | return ERR_PTR(error); | |
1571 | } | |
1572 | ||
1573 | #ifdef CONFIG_PROC_FS | |
1574 | static struct proc_dir_entry *proc_fs_nfs; | |
1575 | ||
1576 | static int nfs_server_list_open(struct inode *inode, struct file *file); | |
1577 | static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); | |
1578 | static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); | |
1579 | static void nfs_server_list_stop(struct seq_file *p, void *v); | |
1580 | static int nfs_server_list_show(struct seq_file *m, void *v); | |
1581 | ||
1582 | static const struct seq_operations nfs_server_list_ops = { | |
1583 | .start = nfs_server_list_start, | |
1584 | .next = nfs_server_list_next, | |
1585 | .stop = nfs_server_list_stop, | |
1586 | .show = nfs_server_list_show, | |
1587 | }; | |
1588 | ||
1589 | static const struct file_operations nfs_server_list_fops = { | |
1590 | .open = nfs_server_list_open, | |
1591 | .read = seq_read, | |
1592 | .llseek = seq_lseek, | |
1593 | .release = seq_release, | |
1594 | .owner = THIS_MODULE, | |
1595 | }; | |
1596 | ||
1597 | static int nfs_volume_list_open(struct inode *inode, struct file *file); | |
1598 | static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); | |
1599 | static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); | |
1600 | static void nfs_volume_list_stop(struct seq_file *p, void *v); | |
1601 | static int nfs_volume_list_show(struct seq_file *m, void *v); | |
1602 | ||
1603 | static const struct seq_operations nfs_volume_list_ops = { | |
1604 | .start = nfs_volume_list_start, | |
1605 | .next = nfs_volume_list_next, | |
1606 | .stop = nfs_volume_list_stop, | |
1607 | .show = nfs_volume_list_show, | |
1608 | }; | |
1609 | ||
1610 | static const struct file_operations nfs_volume_list_fops = { | |
1611 | .open = nfs_volume_list_open, | |
1612 | .read = seq_read, | |
1613 | .llseek = seq_lseek, | |
1614 | .release = seq_release, | |
1615 | .owner = THIS_MODULE, | |
1616 | }; | |
1617 | ||
1618 | /* | |
1619 | * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which | |
1620 | * we're dealing | |
1621 | */ | |
1622 | static int nfs_server_list_open(struct inode *inode, struct file *file) | |
1623 | { | |
1624 | struct seq_file *m; | |
1625 | int ret; | |
1626 | ||
1627 | ret = seq_open(file, &nfs_server_list_ops); | |
1628 | if (ret < 0) | |
1629 | return ret; | |
1630 | ||
1631 | m = file->private_data; | |
1632 | m->private = PDE(inode)->data; | |
1633 | ||
1634 | return 0; | |
1635 | } | |
1636 | ||
1637 | /* | |
1638 | * set up the iterator to start reading from the server list and return the first item | |
1639 | */ | |
1640 | static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) | |
1641 | { | |
1642 | /* lock the list against modification */ | |
1643 | spin_lock(&nfs_client_lock); | |
1644 | return seq_list_start_head(&nfs_client_list, *_pos); | |
1645 | } | |
1646 | ||
1647 | /* | |
1648 | * move to next server | |
1649 | */ | |
1650 | static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) | |
1651 | { | |
1652 | return seq_list_next(v, &nfs_client_list, pos); | |
1653 | } | |
1654 | ||
1655 | /* | |
1656 | * clean up after reading from the transports list | |
1657 | */ | |
1658 | static void nfs_server_list_stop(struct seq_file *p, void *v) | |
1659 | { | |
1660 | spin_unlock(&nfs_client_lock); | |
1661 | } | |
1662 | ||
1663 | /* | |
1664 | * display a header line followed by a load of call lines | |
1665 | */ | |
1666 | static int nfs_server_list_show(struct seq_file *m, void *v) | |
1667 | { | |
1668 | struct nfs_client *clp; | |
1669 | ||
1670 | /* display header on line 1 */ | |
1671 | if (v == &nfs_client_list) { | |
1672 | seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); | |
1673 | return 0; | |
1674 | } | |
1675 | ||
1676 | /* display one transport per line on subsequent lines */ | |
1677 | clp = list_entry(v, struct nfs_client, cl_share_link); | |
1678 | ||
1679 | seq_printf(m, "v%u %s %s %3d %s\n", | |
1680 | clp->rpc_ops->version, | |
1681 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), | |
1682 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), | |
1683 | atomic_read(&clp->cl_count), | |
1684 | clp->cl_hostname); | |
1685 | ||
1686 | return 0; | |
1687 | } | |
1688 | ||
1689 | /* | |
1690 | * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes | |
1691 | */ | |
1692 | static int nfs_volume_list_open(struct inode *inode, struct file *file) | |
1693 | { | |
1694 | struct seq_file *m; | |
1695 | int ret; | |
1696 | ||
1697 | ret = seq_open(file, &nfs_volume_list_ops); | |
1698 | if (ret < 0) | |
1699 | return ret; | |
1700 | ||
1701 | m = file->private_data; | |
1702 | m->private = PDE(inode)->data; | |
1703 | ||
1704 | return 0; | |
1705 | } | |
1706 | ||
1707 | /* | |
1708 | * set up the iterator to start reading from the volume list and return the first item | |
1709 | */ | |
1710 | static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) | |
1711 | { | |
1712 | /* lock the list against modification */ | |
1713 | spin_lock(&nfs_client_lock); | |
1714 | return seq_list_start_head(&nfs_volume_list, *_pos); | |
1715 | } | |
1716 | ||
1717 | /* | |
1718 | * move to next volume | |
1719 | */ | |
1720 | static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) | |
1721 | { | |
1722 | return seq_list_next(v, &nfs_volume_list, pos); | |
1723 | } | |
1724 | ||
1725 | /* | |
1726 | * clean up after reading from the transports list | |
1727 | */ | |
1728 | static void nfs_volume_list_stop(struct seq_file *p, void *v) | |
1729 | { | |
1730 | spin_unlock(&nfs_client_lock); | |
1731 | } | |
1732 | ||
1733 | /* | |
1734 | * display a header line followed by a load of call lines | |
1735 | */ | |
1736 | static int nfs_volume_list_show(struct seq_file *m, void *v) | |
1737 | { | |
1738 | struct nfs_server *server; | |
1739 | struct nfs_client *clp; | |
1740 | char dev[8], fsid[17]; | |
1741 | ||
1742 | /* display header on line 1 */ | |
1743 | if (v == &nfs_volume_list) { | |
1744 | seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); | |
1745 | return 0; | |
1746 | } | |
1747 | /* display one transport per line on subsequent lines */ | |
1748 | server = list_entry(v, struct nfs_server, master_link); | |
1749 | clp = server->nfs_client; | |
1750 | ||
1751 | snprintf(dev, 8, "%u:%u", | |
1752 | MAJOR(server->s_dev), MINOR(server->s_dev)); | |
1753 | ||
1754 | snprintf(fsid, 17, "%llx:%llx", | |
1755 | (unsigned long long) server->fsid.major, | |
1756 | (unsigned long long) server->fsid.minor); | |
1757 | ||
1758 | seq_printf(m, "v%u %s %s %-7s %-17s %s\n", | |
1759 | clp->rpc_ops->version, | |
1760 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), | |
1761 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), | |
1762 | dev, | |
1763 | fsid, | |
1764 | nfs_server_fscache_state(server)); | |
1765 | ||
1766 | return 0; | |
1767 | } | |
1768 | ||
1769 | /* | |
1770 | * initialise the /proc/fs/nfsfs/ directory | |
1771 | */ | |
1772 | int __init nfs_fs_proc_init(void) | |
1773 | { | |
1774 | struct proc_dir_entry *p; | |
1775 | ||
1776 | proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); | |
1777 | if (!proc_fs_nfs) | |
1778 | goto error_0; | |
1779 | ||
1780 | /* a file of servers with which we're dealing */ | |
1781 | p = proc_create("servers", S_IFREG|S_IRUGO, | |
1782 | proc_fs_nfs, &nfs_server_list_fops); | |
1783 | if (!p) | |
1784 | goto error_1; | |
1785 | ||
1786 | /* a file of volumes that we have mounted */ | |
1787 | p = proc_create("volumes", S_IFREG|S_IRUGO, | |
1788 | proc_fs_nfs, &nfs_volume_list_fops); | |
1789 | if (!p) | |
1790 | goto error_2; | |
1791 | return 0; | |
1792 | ||
1793 | error_2: | |
1794 | remove_proc_entry("servers", proc_fs_nfs); | |
1795 | error_1: | |
1796 | remove_proc_entry("fs/nfsfs", NULL); | |
1797 | error_0: | |
1798 | return -ENOMEM; | |
1799 | } | |
1800 | ||
1801 | /* | |
1802 | * clean up the /proc/fs/nfsfs/ directory | |
1803 | */ | |
1804 | void nfs_fs_proc_exit(void) | |
1805 | { | |
1806 | remove_proc_entry("volumes", proc_fs_nfs); | |
1807 | remove_proc_entry("servers", proc_fs_nfs); | |
1808 | remove_proc_entry("fs/nfsfs", NULL); | |
1809 | } | |
1810 | ||
1811 | #endif /* CONFIG_PROC_FS */ |