Root/
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 | #include "pnfs.h" |
52 | |
53 | #define NFSDBG_FACILITY NFSDBG_CLIENT |
54 | |
55 | static DEFINE_SPINLOCK(nfs_client_lock); |
56 | static LIST_HEAD(nfs_client_list); |
57 | static LIST_HEAD(nfs_volume_list); |
58 | static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); |
59 | #ifdef CONFIG_NFS_V4 |
60 | static DEFINE_IDR(cb_ident_idr); /* Protected by nfs_client_lock */ |
61 | |
62 | /* |
63 | * Get a unique NFSv4.0 callback identifier which will be used |
64 | * by the V4.0 callback service to lookup the nfs_client struct |
65 | */ |
66 | static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion) |
67 | { |
68 | int ret = 0; |
69 | |
70 | if (clp->rpc_ops->version != 4 || minorversion != 0) |
71 | return ret; |
72 | retry: |
73 | if (!idr_pre_get(&cb_ident_idr, GFP_KERNEL)) |
74 | return -ENOMEM; |
75 | spin_lock(&nfs_client_lock); |
76 | ret = idr_get_new(&cb_ident_idr, clp, &clp->cl_cb_ident); |
77 | spin_unlock(&nfs_client_lock); |
78 | if (ret == -EAGAIN) |
79 | goto retry; |
80 | return ret; |
81 | } |
82 | #endif /* CONFIG_NFS_V4 */ |
83 | |
84 | /* |
85 | * Turn off NFSv4 uid/gid mapping when using AUTH_SYS |
86 | */ |
87 | static int nfs4_disable_idmapping = 0; |
88 | |
89 | /* |
90 | * RPC cruft for NFS |
91 | */ |
92 | static struct rpc_version *nfs_version[5] = { |
93 | [2] = &nfs_version2, |
94 | #ifdef CONFIG_NFS_V3 |
95 | [3] = &nfs_version3, |
96 | #endif |
97 | #ifdef CONFIG_NFS_V4 |
98 | [4] = &nfs_version4, |
99 | #endif |
100 | }; |
101 | |
102 | struct rpc_program nfs_program = { |
103 | .name = "nfs", |
104 | .number = NFS_PROGRAM, |
105 | .nrvers = ARRAY_SIZE(nfs_version), |
106 | .version = nfs_version, |
107 | .stats = &nfs_rpcstat, |
108 | .pipe_dir_name = "/nfs", |
109 | }; |
110 | |
111 | struct rpc_stat nfs_rpcstat = { |
112 | .program = &nfs_program |
113 | }; |
114 | |
115 | |
116 | #ifdef CONFIG_NFS_V3_ACL |
117 | static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; |
118 | static struct rpc_version * nfsacl_version[] = { |
119 | [3] = &nfsacl_version3, |
120 | }; |
121 | |
122 | struct rpc_program nfsacl_program = { |
123 | .name = "nfsacl", |
124 | .number = NFS_ACL_PROGRAM, |
125 | .nrvers = ARRAY_SIZE(nfsacl_version), |
126 | .version = nfsacl_version, |
127 | .stats = &nfsacl_rpcstat, |
128 | }; |
129 | #endif /* CONFIG_NFS_V3_ACL */ |
130 | |
131 | struct nfs_client_initdata { |
132 | const char *hostname; |
133 | const struct sockaddr *addr; |
134 | size_t addrlen; |
135 | const struct nfs_rpc_ops *rpc_ops; |
136 | int proto; |
137 | u32 minorversion; |
138 | }; |
139 | |
140 | /* |
141 | * Allocate a shared client record |
142 | * |
143 | * Since these are allocated/deallocated very rarely, we don't |
144 | * bother putting them in a slab cache... |
145 | */ |
146 | static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) |
147 | { |
148 | struct nfs_client *clp; |
149 | struct rpc_cred *cred; |
150 | int err = -ENOMEM; |
151 | |
152 | if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) |
153 | goto error_0; |
154 | |
155 | clp->rpc_ops = cl_init->rpc_ops; |
156 | |
157 | atomic_set(&clp->cl_count, 1); |
158 | clp->cl_cons_state = NFS_CS_INITING; |
159 | |
160 | memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); |
161 | clp->cl_addrlen = cl_init->addrlen; |
162 | |
163 | if (cl_init->hostname) { |
164 | err = -ENOMEM; |
165 | clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); |
166 | if (!clp->cl_hostname) |
167 | goto error_cleanup; |
168 | } |
169 | |
170 | INIT_LIST_HEAD(&clp->cl_superblocks); |
171 | clp->cl_rpcclient = ERR_PTR(-EINVAL); |
172 | |
173 | clp->cl_proto = cl_init->proto; |
174 | |
175 | #ifdef CONFIG_NFS_V4 |
176 | err = nfs_get_cb_ident_idr(clp, cl_init->minorversion); |
177 | if (err) |
178 | goto error_cleanup; |
179 | |
180 | spin_lock_init(&clp->cl_lock); |
181 | INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); |
182 | rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); |
183 | clp->cl_boot_time = CURRENT_TIME; |
184 | clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; |
185 | clp->cl_minorversion = cl_init->minorversion; |
186 | clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; |
187 | #endif |
188 | cred = rpc_lookup_machine_cred(); |
189 | if (!IS_ERR(cred)) |
190 | clp->cl_machine_cred = cred; |
191 | #if defined(CONFIG_NFS_V4_1) |
192 | INIT_LIST_HEAD(&clp->cl_layouts); |
193 | #endif |
194 | nfs_fscache_get_client_cookie(clp); |
195 | |
196 | return clp; |
197 | |
198 | error_cleanup: |
199 | kfree(clp); |
200 | error_0: |
201 | return ERR_PTR(err); |
202 | } |
203 | |
204 | #ifdef CONFIG_NFS_V4 |
205 | #ifdef CONFIG_NFS_V4_1 |
206 | static void nfs4_shutdown_session(struct nfs_client *clp) |
207 | { |
208 | if (nfs4_has_session(clp)) |
209 | nfs4_destroy_session(clp->cl_session); |
210 | } |
211 | #else /* CONFIG_NFS_V4_1 */ |
212 | static void nfs4_shutdown_session(struct nfs_client *clp) |
213 | { |
214 | } |
215 | #endif /* CONFIG_NFS_V4_1 */ |
216 | |
217 | /* |
218 | * Destroy the NFS4 callback service |
219 | */ |
220 | static void nfs4_destroy_callback(struct nfs_client *clp) |
221 | { |
222 | if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) |
223 | nfs_callback_down(clp->cl_mvops->minor_version); |
224 | } |
225 | |
226 | static void nfs4_shutdown_client(struct nfs_client *clp) |
227 | { |
228 | if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) |
229 | nfs4_kill_renewd(clp); |
230 | nfs4_shutdown_session(clp); |
231 | nfs4_destroy_callback(clp); |
232 | if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) |
233 | nfs_idmap_delete(clp); |
234 | |
235 | rpc_destroy_wait_queue(&clp->cl_rpcwaitq); |
236 | } |
237 | |
238 | /* idr_remove_all is not needed as all id's are removed by nfs_put_client */ |
239 | void nfs_cleanup_cb_ident_idr(void) |
240 | { |
241 | idr_destroy(&cb_ident_idr); |
242 | } |
243 | |
244 | /* nfs_client_lock held */ |
245 | static void nfs_cb_idr_remove_locked(struct nfs_client *clp) |
246 | { |
247 | if (clp->cl_cb_ident) |
248 | idr_remove(&cb_ident_idr, clp->cl_cb_ident); |
249 | } |
250 | |
251 | static void pnfs_init_server(struct nfs_server *server) |
252 | { |
253 | rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); |
254 | } |
255 | |
256 | #else |
257 | static void nfs4_shutdown_client(struct nfs_client *clp) |
258 | { |
259 | } |
260 | |
261 | void nfs_cleanup_cb_ident_idr(void) |
262 | { |
263 | } |
264 | |
265 | static void nfs_cb_idr_remove_locked(struct nfs_client *clp) |
266 | { |
267 | } |
268 | |
269 | static void pnfs_init_server(struct nfs_server *server) |
270 | { |
271 | } |
272 | |
273 | #endif /* CONFIG_NFS_V4 */ |
274 | |
275 | /* |
276 | * Destroy a shared client record |
277 | */ |
278 | static void nfs_free_client(struct nfs_client *clp) |
279 | { |
280 | dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); |
281 | |
282 | nfs4_shutdown_client(clp); |
283 | |
284 | nfs_fscache_release_client_cookie(clp); |
285 | |
286 | /* -EIO all pending I/O */ |
287 | if (!IS_ERR(clp->cl_rpcclient)) |
288 | rpc_shutdown_client(clp->cl_rpcclient); |
289 | |
290 | if (clp->cl_machine_cred != NULL) |
291 | put_rpccred(clp->cl_machine_cred); |
292 | |
293 | nfs4_deviceid_purge_client(clp); |
294 | |
295 | kfree(clp->cl_hostname); |
296 | kfree(clp); |
297 | |
298 | dprintk("<-- nfs_free_client()\n"); |
299 | } |
300 | |
301 | /* |
302 | * Release a reference to a shared client record |
303 | */ |
304 | void nfs_put_client(struct nfs_client *clp) |
305 | { |
306 | if (!clp) |
307 | return; |
308 | |
309 | dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); |
310 | |
311 | if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { |
312 | list_del(&clp->cl_share_link); |
313 | nfs_cb_idr_remove_locked(clp); |
314 | spin_unlock(&nfs_client_lock); |
315 | |
316 | BUG_ON(!list_empty(&clp->cl_superblocks)); |
317 | |
318 | nfs_free_client(clp); |
319 | } |
320 | } |
321 | EXPORT_SYMBOL_GPL(nfs_put_client); |
322 | |
323 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
324 | /* |
325 | * Test if two ip6 socket addresses refer to the same socket by |
326 | * comparing relevant fields. The padding bytes specifically, are not |
327 | * compared. sin6_flowinfo is not compared because it only affects QoS |
328 | * and sin6_scope_id is only compared if the address is "link local" |
329 | * because "link local" addresses need only be unique to a specific |
330 | * link. Conversely, ordinary unicast addresses might have different |
331 | * sin6_scope_id. |
332 | * |
333 | * The caller should ensure both socket addresses are AF_INET6. |
334 | */ |
335 | static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, |
336 | const struct sockaddr *sa2) |
337 | { |
338 | const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; |
339 | const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; |
340 | |
341 | if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL && |
342 | sin1->sin6_scope_id != sin2->sin6_scope_id) |
343 | return 0; |
344 | |
345 | return ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr); |
346 | } |
347 | #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ |
348 | static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, |
349 | const struct sockaddr *sa2) |
350 | { |
351 | return 0; |
352 | } |
353 | #endif |
354 | |
355 | /* |
356 | * Test if two ip4 socket addresses refer to the same socket, by |
357 | * comparing relevant fields. The padding bytes specifically, are |
358 | * not compared. |
359 | * |
360 | * The caller should ensure both socket addresses are AF_INET. |
361 | */ |
362 | static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, |
363 | const struct sockaddr *sa2) |
364 | { |
365 | const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; |
366 | const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; |
367 | |
368 | return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; |
369 | } |
370 | |
371 | static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, |
372 | const struct sockaddr *sa2) |
373 | { |
374 | const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; |
375 | const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; |
376 | |
377 | return nfs_sockaddr_match_ipaddr6(sa1, sa2) && |
378 | (sin1->sin6_port == sin2->sin6_port); |
379 | } |
380 | |
381 | static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, |
382 | const struct sockaddr *sa2) |
383 | { |
384 | const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; |
385 | const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; |
386 | |
387 | return nfs_sockaddr_match_ipaddr4(sa1, sa2) && |
388 | (sin1->sin_port == sin2->sin_port); |
389 | } |
390 | |
391 | /* |
392 | * Test if two socket addresses represent the same actual socket, |
393 | * by comparing (only) relevant fields, excluding the port number. |
394 | */ |
395 | static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, |
396 | const struct sockaddr *sa2) |
397 | { |
398 | if (sa1->sa_family != sa2->sa_family) |
399 | return 0; |
400 | |
401 | switch (sa1->sa_family) { |
402 | case AF_INET: |
403 | return nfs_sockaddr_match_ipaddr4(sa1, sa2); |
404 | case AF_INET6: |
405 | return nfs_sockaddr_match_ipaddr6(sa1, sa2); |
406 | } |
407 | return 0; |
408 | } |
409 | |
410 | /* |
411 | * Test if two socket addresses represent the same actual socket, |
412 | * by comparing (only) relevant fields, including the port number. |
413 | */ |
414 | static int nfs_sockaddr_cmp(const struct sockaddr *sa1, |
415 | const struct sockaddr *sa2) |
416 | { |
417 | if (sa1->sa_family != sa2->sa_family) |
418 | return 0; |
419 | |
420 | switch (sa1->sa_family) { |
421 | case AF_INET: |
422 | return nfs_sockaddr_cmp_ip4(sa1, sa2); |
423 | case AF_INET6: |
424 | return nfs_sockaddr_cmp_ip6(sa1, sa2); |
425 | } |
426 | return 0; |
427 | } |
428 | |
429 | /* Common match routine for v4.0 and v4.1 callback services */ |
430 | bool |
431 | nfs4_cb_match_client(const struct sockaddr *addr, struct nfs_client *clp, |
432 | u32 minorversion) |
433 | { |
434 | struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; |
435 | |
436 | /* Don't match clients that failed to initialise */ |
437 | if (!(clp->cl_cons_state == NFS_CS_READY || |
438 | clp->cl_cons_state == NFS_CS_SESSION_INITING)) |
439 | return false; |
440 | |
441 | /* Match the version and minorversion */ |
442 | if (clp->rpc_ops->version != 4 || |
443 | clp->cl_minorversion != minorversion) |
444 | return false; |
445 | |
446 | /* Match only the IP address, not the port number */ |
447 | if (!nfs_sockaddr_match_ipaddr(addr, clap)) |
448 | return false; |
449 | |
450 | return true; |
451 | } |
452 | |
453 | /* |
454 | * Find an nfs_client on the list that matches the initialisation data |
455 | * that is supplied. |
456 | */ |
457 | static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) |
458 | { |
459 | struct nfs_client *clp; |
460 | const struct sockaddr *sap = data->addr; |
461 | |
462 | list_for_each_entry(clp, &nfs_client_list, cl_share_link) { |
463 | const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; |
464 | /* Don't match clients that failed to initialise properly */ |
465 | if (clp->cl_cons_state < 0) |
466 | continue; |
467 | |
468 | /* Different NFS versions cannot share the same nfs_client */ |
469 | if (clp->rpc_ops != data->rpc_ops) |
470 | continue; |
471 | |
472 | if (clp->cl_proto != data->proto) |
473 | continue; |
474 | /* Match nfsv4 minorversion */ |
475 | if (clp->cl_minorversion != data->minorversion) |
476 | continue; |
477 | /* Match the full socket address */ |
478 | if (!nfs_sockaddr_cmp(sap, clap)) |
479 | continue; |
480 | |
481 | atomic_inc(&clp->cl_count); |
482 | return clp; |
483 | } |
484 | return NULL; |
485 | } |
486 | |
487 | /* |
488 | * Look up a client by IP address and protocol version |
489 | * - creates a new record if one doesn't yet exist |
490 | */ |
491 | static struct nfs_client * |
492 | nfs_get_client(const struct nfs_client_initdata *cl_init, |
493 | const struct rpc_timeout *timeparms, |
494 | const char *ip_addr, |
495 | rpc_authflavor_t authflavour, |
496 | int noresvport) |
497 | { |
498 | struct nfs_client *clp, *new = NULL; |
499 | int error; |
500 | |
501 | dprintk("--> nfs_get_client(%s,v%u)\n", |
502 | cl_init->hostname ?: "", cl_init->rpc_ops->version); |
503 | |
504 | /* see if the client already exists */ |
505 | do { |
506 | spin_lock(&nfs_client_lock); |
507 | |
508 | clp = nfs_match_client(cl_init); |
509 | if (clp) |
510 | goto found_client; |
511 | if (new) |
512 | goto install_client; |
513 | |
514 | spin_unlock(&nfs_client_lock); |
515 | |
516 | new = nfs_alloc_client(cl_init); |
517 | } while (!IS_ERR(new)); |
518 | |
519 | dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new)); |
520 | return new; |
521 | |
522 | /* install a new client and return with it unready */ |
523 | install_client: |
524 | clp = new; |
525 | list_add(&clp->cl_share_link, &nfs_client_list); |
526 | spin_unlock(&nfs_client_lock); |
527 | |
528 | error = cl_init->rpc_ops->init_client(clp, timeparms, ip_addr, |
529 | authflavour, noresvport); |
530 | if (error < 0) { |
531 | nfs_put_client(clp); |
532 | return ERR_PTR(error); |
533 | } |
534 | dprintk("--> nfs_get_client() = %p [new]\n", clp); |
535 | return clp; |
536 | |
537 | /* found an existing client |
538 | * - make sure it's ready before returning |
539 | */ |
540 | found_client: |
541 | spin_unlock(&nfs_client_lock); |
542 | |
543 | if (new) |
544 | nfs_free_client(new); |
545 | |
546 | error = wait_event_killable(nfs_client_active_wq, |
547 | clp->cl_cons_state < NFS_CS_INITING); |
548 | if (error < 0) { |
549 | nfs_put_client(clp); |
550 | return ERR_PTR(-ERESTARTSYS); |
551 | } |
552 | |
553 | if (clp->cl_cons_state < NFS_CS_READY) { |
554 | error = clp->cl_cons_state; |
555 | nfs_put_client(clp); |
556 | return ERR_PTR(error); |
557 | } |
558 | |
559 | BUG_ON(clp->cl_cons_state != NFS_CS_READY); |
560 | |
561 | dprintk("--> nfs_get_client() = %p [share]\n", clp); |
562 | return clp; |
563 | } |
564 | |
565 | /* |
566 | * Mark a server as ready or failed |
567 | */ |
568 | void nfs_mark_client_ready(struct nfs_client *clp, int state) |
569 | { |
570 | clp->cl_cons_state = state; |
571 | wake_up_all(&nfs_client_active_wq); |
572 | } |
573 | |
574 | /* |
575 | * With sessions, the client is not marked ready until after a |
576 | * successful EXCHANGE_ID and CREATE_SESSION. |
577 | * |
578 | * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate |
579 | * other versions of NFS can be tried. |
580 | */ |
581 | int nfs4_check_client_ready(struct nfs_client *clp) |
582 | { |
583 | if (!nfs4_has_session(clp)) |
584 | return 0; |
585 | if (clp->cl_cons_state < NFS_CS_READY) |
586 | return -EPROTONOSUPPORT; |
587 | return 0; |
588 | } |
589 | |
590 | /* |
591 | * Initialise the timeout values for a connection |
592 | */ |
593 | static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, |
594 | unsigned int timeo, unsigned int retrans) |
595 | { |
596 | to->to_initval = timeo * HZ / 10; |
597 | to->to_retries = retrans; |
598 | |
599 | switch (proto) { |
600 | case XPRT_TRANSPORT_TCP: |
601 | case XPRT_TRANSPORT_RDMA: |
602 | if (to->to_retries == 0) |
603 | to->to_retries = NFS_DEF_TCP_RETRANS; |
604 | if (to->to_initval == 0) |
605 | to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; |
606 | if (to->to_initval > NFS_MAX_TCP_TIMEOUT) |
607 | to->to_initval = NFS_MAX_TCP_TIMEOUT; |
608 | to->to_increment = to->to_initval; |
609 | to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); |
610 | if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) |
611 | to->to_maxval = NFS_MAX_TCP_TIMEOUT; |
612 | if (to->to_maxval < to->to_initval) |
613 | to->to_maxval = to->to_initval; |
614 | to->to_exponential = 0; |
615 | break; |
616 | case XPRT_TRANSPORT_UDP: |
617 | if (to->to_retries == 0) |
618 | to->to_retries = NFS_DEF_UDP_RETRANS; |
619 | if (!to->to_initval) |
620 | to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; |
621 | if (to->to_initval > NFS_MAX_UDP_TIMEOUT) |
622 | to->to_initval = NFS_MAX_UDP_TIMEOUT; |
623 | to->to_maxval = NFS_MAX_UDP_TIMEOUT; |
624 | to->to_exponential = 1; |
625 | break; |
626 | default: |
627 | BUG(); |
628 | } |
629 | } |
630 | |
631 | /* |
632 | * Create an RPC client handle |
633 | */ |
634 | static int nfs_create_rpc_client(struct nfs_client *clp, |
635 | const struct rpc_timeout *timeparms, |
636 | rpc_authflavor_t flavor, |
637 | int discrtry, int noresvport) |
638 | { |
639 | struct rpc_clnt *clnt = NULL; |
640 | struct rpc_create_args args = { |
641 | .net = &init_net, |
642 | .protocol = clp->cl_proto, |
643 | .address = (struct sockaddr *)&clp->cl_addr, |
644 | .addrsize = clp->cl_addrlen, |
645 | .timeout = timeparms, |
646 | .servername = clp->cl_hostname, |
647 | .program = &nfs_program, |
648 | .version = clp->rpc_ops->version, |
649 | .authflavor = flavor, |
650 | }; |
651 | |
652 | if (discrtry) |
653 | args.flags |= RPC_CLNT_CREATE_DISCRTRY; |
654 | if (noresvport) |
655 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; |
656 | |
657 | if (!IS_ERR(clp->cl_rpcclient)) |
658 | return 0; |
659 | |
660 | clnt = rpc_create(&args); |
661 | if (IS_ERR(clnt)) { |
662 | dprintk("%s: cannot create RPC client. Error = %ld\n", |
663 | __func__, PTR_ERR(clnt)); |
664 | return PTR_ERR(clnt); |
665 | } |
666 | |
667 | clp->cl_rpcclient = clnt; |
668 | return 0; |
669 | } |
670 | |
671 | /* |
672 | * Version 2 or 3 client destruction |
673 | */ |
674 | static void nfs_destroy_server(struct nfs_server *server) |
675 | { |
676 | if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) || |
677 | !(server->flags & NFS_MOUNT_LOCAL_FCNTL)) |
678 | nlmclnt_done(server->nlm_host); |
679 | } |
680 | |
681 | /* |
682 | * Version 2 or 3 lockd setup |
683 | */ |
684 | static int nfs_start_lockd(struct nfs_server *server) |
685 | { |
686 | struct nlm_host *host; |
687 | struct nfs_client *clp = server->nfs_client; |
688 | struct nlmclnt_initdata nlm_init = { |
689 | .hostname = clp->cl_hostname, |
690 | .address = (struct sockaddr *)&clp->cl_addr, |
691 | .addrlen = clp->cl_addrlen, |
692 | .nfs_version = clp->rpc_ops->version, |
693 | .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? |
694 | 1 : 0, |
695 | }; |
696 | |
697 | if (nlm_init.nfs_version > 3) |
698 | return 0; |
699 | if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && |
700 | (server->flags & NFS_MOUNT_LOCAL_FCNTL)) |
701 | return 0; |
702 | |
703 | switch (clp->cl_proto) { |
704 | default: |
705 | nlm_init.protocol = IPPROTO_TCP; |
706 | break; |
707 | case XPRT_TRANSPORT_UDP: |
708 | nlm_init.protocol = IPPROTO_UDP; |
709 | } |
710 | |
711 | host = nlmclnt_init(&nlm_init); |
712 | if (IS_ERR(host)) |
713 | return PTR_ERR(host); |
714 | |
715 | server->nlm_host = host; |
716 | server->destroy = nfs_destroy_server; |
717 | return 0; |
718 | } |
719 | |
720 | /* |
721 | * Initialise an NFSv3 ACL client connection |
722 | */ |
723 | #ifdef CONFIG_NFS_V3_ACL |
724 | static void nfs_init_server_aclclient(struct nfs_server *server) |
725 | { |
726 | if (server->nfs_client->rpc_ops->version != 3) |
727 | goto out_noacl; |
728 | if (server->flags & NFS_MOUNT_NOACL) |
729 | goto out_noacl; |
730 | |
731 | server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); |
732 | if (IS_ERR(server->client_acl)) |
733 | goto out_noacl; |
734 | |
735 | /* No errors! Assume that Sun nfsacls are supported */ |
736 | server->caps |= NFS_CAP_ACLS; |
737 | return; |
738 | |
739 | out_noacl: |
740 | server->caps &= ~NFS_CAP_ACLS; |
741 | } |
742 | #else |
743 | static inline void nfs_init_server_aclclient(struct nfs_server *server) |
744 | { |
745 | server->flags &= ~NFS_MOUNT_NOACL; |
746 | server->caps &= ~NFS_CAP_ACLS; |
747 | } |
748 | #endif |
749 | |
750 | /* |
751 | * Create a general RPC client |
752 | */ |
753 | static int nfs_init_server_rpcclient(struct nfs_server *server, |
754 | const struct rpc_timeout *timeo, |
755 | rpc_authflavor_t pseudoflavour) |
756 | { |
757 | struct nfs_client *clp = server->nfs_client; |
758 | |
759 | server->client = rpc_clone_client(clp->cl_rpcclient); |
760 | if (IS_ERR(server->client)) { |
761 | dprintk("%s: couldn't create rpc_client!\n", __func__); |
762 | return PTR_ERR(server->client); |
763 | } |
764 | |
765 | memcpy(&server->client->cl_timeout_default, |
766 | timeo, |
767 | sizeof(server->client->cl_timeout_default)); |
768 | server->client->cl_timeout = &server->client->cl_timeout_default; |
769 | |
770 | if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { |
771 | struct rpc_auth *auth; |
772 | |
773 | auth = rpcauth_create(pseudoflavour, server->client); |
774 | if (IS_ERR(auth)) { |
775 | dprintk("%s: couldn't create credcache!\n", __func__); |
776 | return PTR_ERR(auth); |
777 | } |
778 | } |
779 | server->client->cl_softrtry = 0; |
780 | if (server->flags & NFS_MOUNT_SOFT) |
781 | server->client->cl_softrtry = 1; |
782 | |
783 | return 0; |
784 | } |
785 | |
786 | /* |
787 | * Initialise an NFS2 or NFS3 client |
788 | */ |
789 | int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms, |
790 | const char *ip_addr, rpc_authflavor_t authflavour, |
791 | int noresvport) |
792 | { |
793 | int error; |
794 | |
795 | if (clp->cl_cons_state == NFS_CS_READY) { |
796 | /* the client is already initialised */ |
797 | dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); |
798 | return 0; |
799 | } |
800 | |
801 | /* |
802 | * Create a client RPC handle for doing FSSTAT with UNIX auth only |
803 | * - RFC 2623, sec 2.3.2 |
804 | */ |
805 | error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, |
806 | 0, noresvport); |
807 | if (error < 0) |
808 | goto error; |
809 | nfs_mark_client_ready(clp, NFS_CS_READY); |
810 | return 0; |
811 | |
812 | error: |
813 | nfs_mark_client_ready(clp, error); |
814 | dprintk("<-- nfs_init_client() = xerror %d\n", error); |
815 | return error; |
816 | } |
817 | |
818 | /* |
819 | * Create a version 2 or 3 client |
820 | */ |
821 | static int nfs_init_server(struct nfs_server *server, |
822 | const struct nfs_parsed_mount_data *data) |
823 | { |
824 | struct nfs_client_initdata cl_init = { |
825 | .hostname = data->nfs_server.hostname, |
826 | .addr = (const struct sockaddr *)&data->nfs_server.address, |
827 | .addrlen = data->nfs_server.addrlen, |
828 | .rpc_ops = &nfs_v2_clientops, |
829 | .proto = data->nfs_server.protocol, |
830 | }; |
831 | struct rpc_timeout timeparms; |
832 | struct nfs_client *clp; |
833 | int error; |
834 | |
835 | dprintk("--> nfs_init_server()\n"); |
836 | |
837 | #ifdef CONFIG_NFS_V3 |
838 | if (data->version == 3) |
839 | cl_init.rpc_ops = &nfs_v3_clientops; |
840 | #endif |
841 | |
842 | nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, |
843 | data->timeo, data->retrans); |
844 | |
845 | /* Allocate or find a client reference we can use */ |
846 | clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX, |
847 | data->flags & NFS_MOUNT_NORESVPORT); |
848 | if (IS_ERR(clp)) { |
849 | dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); |
850 | return PTR_ERR(clp); |
851 | } |
852 | |
853 | server->nfs_client = clp; |
854 | |
855 | /* Initialise the client representation from the mount data */ |
856 | server->flags = data->flags; |
857 | server->options = data->options; |
858 | server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| |
859 | NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| |
860 | NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; |
861 | |
862 | if (data->rsize) |
863 | server->rsize = nfs_block_size(data->rsize, NULL); |
864 | if (data->wsize) |
865 | server->wsize = nfs_block_size(data->wsize, NULL); |
866 | |
867 | server->acregmin = data->acregmin * HZ; |
868 | server->acregmax = data->acregmax * HZ; |
869 | server->acdirmin = data->acdirmin * HZ; |
870 | server->acdirmax = data->acdirmax * HZ; |
871 | |
872 | /* Start lockd here, before we might error out */ |
873 | error = nfs_start_lockd(server); |
874 | if (error < 0) |
875 | goto error; |
876 | |
877 | server->port = data->nfs_server.port; |
878 | |
879 | error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); |
880 | if (error < 0) |
881 | goto error; |
882 | |
883 | /* Preserve the values of mount_server-related mount options */ |
884 | if (data->mount_server.addrlen) { |
885 | memcpy(&server->mountd_address, &data->mount_server.address, |
886 | data->mount_server.addrlen); |
887 | server->mountd_addrlen = data->mount_server.addrlen; |
888 | } |
889 | server->mountd_version = data->mount_server.version; |
890 | server->mountd_port = data->mount_server.port; |
891 | server->mountd_protocol = data->mount_server.protocol; |
892 | |
893 | server->namelen = data->namlen; |
894 | /* Create a client RPC handle for the NFSv3 ACL management interface */ |
895 | nfs_init_server_aclclient(server); |
896 | dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); |
897 | return 0; |
898 | |
899 | error: |
900 | server->nfs_client = NULL; |
901 | nfs_put_client(clp); |
902 | dprintk("<-- nfs_init_server() = xerror %d\n", error); |
903 | return error; |
904 | } |
905 | |
906 | /* |
907 | * Load up the server record from information gained in an fsinfo record |
908 | */ |
909 | static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) |
910 | { |
911 | unsigned long max_rpc_payload; |
912 | |
913 | /* Work out a lot of parameters */ |
914 | if (server->rsize == 0) |
915 | server->rsize = nfs_block_size(fsinfo->rtpref, NULL); |
916 | if (server->wsize == 0) |
917 | server->wsize = nfs_block_size(fsinfo->wtpref, NULL); |
918 | |
919 | if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) |
920 | server->rsize = nfs_block_size(fsinfo->rtmax, NULL); |
921 | if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) |
922 | server->wsize = nfs_block_size(fsinfo->wtmax, NULL); |
923 | |
924 | max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); |
925 | if (server->rsize > max_rpc_payload) |
926 | server->rsize = max_rpc_payload; |
927 | if (server->rsize > NFS_MAX_FILE_IO_SIZE) |
928 | server->rsize = NFS_MAX_FILE_IO_SIZE; |
929 | server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; |
930 | |
931 | server->backing_dev_info.name = "nfs"; |
932 | server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; |
933 | |
934 | if (server->wsize > max_rpc_payload) |
935 | server->wsize = max_rpc_payload; |
936 | if (server->wsize > NFS_MAX_FILE_IO_SIZE) |
937 | server->wsize = NFS_MAX_FILE_IO_SIZE; |
938 | server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; |
939 | set_pnfs_layoutdriver(server, fsinfo->layouttype); |
940 | |
941 | server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); |
942 | |
943 | server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); |
944 | if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) |
945 | server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; |
946 | if (server->dtsize > server->rsize) |
947 | server->dtsize = server->rsize; |
948 | |
949 | if (server->flags & NFS_MOUNT_NOAC) { |
950 | server->acregmin = server->acregmax = 0; |
951 | server->acdirmin = server->acdirmax = 0; |
952 | } |
953 | |
954 | server->maxfilesize = fsinfo->maxfilesize; |
955 | |
956 | server->time_delta = fsinfo->time_delta; |
957 | |
958 | /* We're airborne Set socket buffersize */ |
959 | rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); |
960 | } |
961 | |
962 | /* |
963 | * Probe filesystem information, including the FSID on v2/v3 |
964 | */ |
965 | static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) |
966 | { |
967 | struct nfs_fsinfo fsinfo; |
968 | struct nfs_client *clp = server->nfs_client; |
969 | int error; |
970 | |
971 | dprintk("--> nfs_probe_fsinfo()\n"); |
972 | |
973 | if (clp->rpc_ops->set_capabilities != NULL) { |
974 | error = clp->rpc_ops->set_capabilities(server, mntfh); |
975 | if (error < 0) |
976 | goto out_error; |
977 | } |
978 | |
979 | fsinfo.fattr = fattr; |
980 | fsinfo.layouttype = 0; |
981 | error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); |
982 | if (error < 0) |
983 | goto out_error; |
984 | |
985 | nfs_server_set_fsinfo(server, &fsinfo); |
986 | |
987 | /* Get some general file system info */ |
988 | if (server->namelen == 0) { |
989 | struct nfs_pathconf pathinfo; |
990 | |
991 | pathinfo.fattr = fattr; |
992 | nfs_fattr_init(fattr); |
993 | |
994 | if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) |
995 | server->namelen = pathinfo.max_namelen; |
996 | } |
997 | |
998 | dprintk("<-- nfs_probe_fsinfo() = 0\n"); |
999 | return 0; |
1000 | |
1001 | out_error: |
1002 | dprintk("nfs_probe_fsinfo: error = %d\n", -error); |
1003 | return error; |
1004 | } |
1005 | |
1006 | /* |
1007 | * Copy useful information when duplicating a server record |
1008 | */ |
1009 | static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) |
1010 | { |
1011 | target->flags = source->flags; |
1012 | target->rsize = source->rsize; |
1013 | target->wsize = source->wsize; |
1014 | target->acregmin = source->acregmin; |
1015 | target->acregmax = source->acregmax; |
1016 | target->acdirmin = source->acdirmin; |
1017 | target->acdirmax = source->acdirmax; |
1018 | target->caps = source->caps; |
1019 | target->options = source->options; |
1020 | } |
1021 | |
1022 | static void nfs_server_insert_lists(struct nfs_server *server) |
1023 | { |
1024 | struct nfs_client *clp = server->nfs_client; |
1025 | |
1026 | spin_lock(&nfs_client_lock); |
1027 | list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); |
1028 | list_add_tail(&server->master_link, &nfs_volume_list); |
1029 | clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); |
1030 | spin_unlock(&nfs_client_lock); |
1031 | |
1032 | } |
1033 | |
1034 | static void nfs_server_remove_lists(struct nfs_server *server) |
1035 | { |
1036 | struct nfs_client *clp = server->nfs_client; |
1037 | |
1038 | spin_lock(&nfs_client_lock); |
1039 | list_del_rcu(&server->client_link); |
1040 | if (clp && list_empty(&clp->cl_superblocks)) |
1041 | set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); |
1042 | list_del(&server->master_link); |
1043 | spin_unlock(&nfs_client_lock); |
1044 | |
1045 | synchronize_rcu(); |
1046 | } |
1047 | |
1048 | /* |
1049 | * Allocate and initialise a server record |
1050 | */ |
1051 | static struct nfs_server *nfs_alloc_server(void) |
1052 | { |
1053 | struct nfs_server *server; |
1054 | |
1055 | server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); |
1056 | if (!server) |
1057 | return NULL; |
1058 | |
1059 | server->client = server->client_acl = ERR_PTR(-EINVAL); |
1060 | |
1061 | /* Zero out the NFS state stuff */ |
1062 | INIT_LIST_HEAD(&server->client_link); |
1063 | INIT_LIST_HEAD(&server->master_link); |
1064 | INIT_LIST_HEAD(&server->delegations); |
1065 | |
1066 | atomic_set(&server->active, 0); |
1067 | |
1068 | server->io_stats = nfs_alloc_iostats(); |
1069 | if (!server->io_stats) { |
1070 | kfree(server); |
1071 | return NULL; |
1072 | } |
1073 | |
1074 | if (bdi_init(&server->backing_dev_info)) { |
1075 | nfs_free_iostats(server->io_stats); |
1076 | kfree(server); |
1077 | return NULL; |
1078 | } |
1079 | |
1080 | pnfs_init_server(server); |
1081 | |
1082 | return server; |
1083 | } |
1084 | |
1085 | /* |
1086 | * Free up a server record |
1087 | */ |
1088 | void nfs_free_server(struct nfs_server *server) |
1089 | { |
1090 | dprintk("--> nfs_free_server()\n"); |
1091 | |
1092 | nfs_server_remove_lists(server); |
1093 | unset_pnfs_layoutdriver(server); |
1094 | |
1095 | if (server->destroy != NULL) |
1096 | server->destroy(server); |
1097 | |
1098 | if (!IS_ERR(server->client_acl)) |
1099 | rpc_shutdown_client(server->client_acl); |
1100 | if (!IS_ERR(server->client)) |
1101 | rpc_shutdown_client(server->client); |
1102 | |
1103 | nfs_put_client(server->nfs_client); |
1104 | |
1105 | nfs_free_iostats(server->io_stats); |
1106 | bdi_destroy(&server->backing_dev_info); |
1107 | kfree(server); |
1108 | nfs_release_automount_timer(); |
1109 | dprintk("<-- nfs_free_server()\n"); |
1110 | } |
1111 | |
1112 | /* |
1113 | * Create a version 2 or 3 volume record |
1114 | * - keyed on server and FSID |
1115 | */ |
1116 | struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, |
1117 | struct nfs_fh *mntfh) |
1118 | { |
1119 | struct nfs_server *server; |
1120 | struct nfs_fattr *fattr; |
1121 | int error; |
1122 | |
1123 | server = nfs_alloc_server(); |
1124 | if (!server) |
1125 | return ERR_PTR(-ENOMEM); |
1126 | |
1127 | error = -ENOMEM; |
1128 | fattr = nfs_alloc_fattr(); |
1129 | if (fattr == NULL) |
1130 | goto error; |
1131 | |
1132 | /* Get a client representation */ |
1133 | error = nfs_init_server(server, data); |
1134 | if (error < 0) |
1135 | goto error; |
1136 | |
1137 | BUG_ON(!server->nfs_client); |
1138 | BUG_ON(!server->nfs_client->rpc_ops); |
1139 | BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); |
1140 | |
1141 | /* Probe the root fh to retrieve its FSID */ |
1142 | error = nfs_probe_fsinfo(server, mntfh, fattr); |
1143 | if (error < 0) |
1144 | goto error; |
1145 | if (server->nfs_client->rpc_ops->version == 3) { |
1146 | if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) |
1147 | server->namelen = NFS3_MAXNAMLEN; |
1148 | if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) |
1149 | server->caps |= NFS_CAP_READDIRPLUS; |
1150 | } else { |
1151 | if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) |
1152 | server->namelen = NFS2_MAXNAMLEN; |
1153 | } |
1154 | |
1155 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1156 | error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr); |
1157 | if (error < 0) { |
1158 | dprintk("nfs_create_server: getattr error = %d\n", -error); |
1159 | goto error; |
1160 | } |
1161 | } |
1162 | memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); |
1163 | |
1164 | dprintk("Server FSID: %llx:%llx\n", |
1165 | (unsigned long long) server->fsid.major, |
1166 | (unsigned long long) server->fsid.minor); |
1167 | |
1168 | nfs_server_insert_lists(server); |
1169 | server->mount_time = jiffies; |
1170 | nfs_free_fattr(fattr); |
1171 | return server; |
1172 | |
1173 | error: |
1174 | nfs_free_fattr(fattr); |
1175 | nfs_free_server(server); |
1176 | return ERR_PTR(error); |
1177 | } |
1178 | |
1179 | #ifdef CONFIG_NFS_V4 |
1180 | /* |
1181 | * NFSv4.0 callback thread helper |
1182 | * |
1183 | * Find a client by IP address, protocol version, and minorversion |
1184 | * |
1185 | * Called from the pg_authenticate method. The callback identifier |
1186 | * is not used as it has not been decoded. |
1187 | * |
1188 | * Returns NULL if no such client |
1189 | */ |
1190 | struct nfs_client * |
1191 | nfs4_find_client_no_ident(const struct sockaddr *addr) |
1192 | { |
1193 | struct nfs_client *clp; |
1194 | |
1195 | spin_lock(&nfs_client_lock); |
1196 | list_for_each_entry(clp, &nfs_client_list, cl_share_link) { |
1197 | if (nfs4_cb_match_client(addr, clp, 0) == false) |
1198 | continue; |
1199 | atomic_inc(&clp->cl_count); |
1200 | spin_unlock(&nfs_client_lock); |
1201 | return clp; |
1202 | } |
1203 | spin_unlock(&nfs_client_lock); |
1204 | return NULL; |
1205 | } |
1206 | |
1207 | /* |
1208 | * NFSv4.0 callback thread helper |
1209 | * |
1210 | * Find a client by callback identifier |
1211 | */ |
1212 | struct nfs_client * |
1213 | nfs4_find_client_ident(int cb_ident) |
1214 | { |
1215 | struct nfs_client *clp; |
1216 | |
1217 | spin_lock(&nfs_client_lock); |
1218 | clp = idr_find(&cb_ident_idr, cb_ident); |
1219 | if (clp) |
1220 | atomic_inc(&clp->cl_count); |
1221 | spin_unlock(&nfs_client_lock); |
1222 | return clp; |
1223 | } |
1224 | |
1225 | #if defined(CONFIG_NFS_V4_1) |
1226 | /* |
1227 | * NFSv4.1 callback thread helper |
1228 | * For CB_COMPOUND calls, find a client by IP address, protocol version, |
1229 | * minorversion, and sessionID |
1230 | * |
1231 | * Returns NULL if no such client |
1232 | */ |
1233 | struct nfs_client * |
1234 | nfs4_find_client_sessionid(const struct sockaddr *addr, |
1235 | struct nfs4_sessionid *sid) |
1236 | { |
1237 | struct nfs_client *clp; |
1238 | |
1239 | spin_lock(&nfs_client_lock); |
1240 | list_for_each_entry(clp, &nfs_client_list, cl_share_link) { |
1241 | if (nfs4_cb_match_client(addr, clp, 1) == false) |
1242 | continue; |
1243 | |
1244 | if (!nfs4_has_session(clp)) |
1245 | continue; |
1246 | |
1247 | /* Match sessionid*/ |
1248 | if (memcmp(clp->cl_session->sess_id.data, |
1249 | sid->data, NFS4_MAX_SESSIONID_LEN) != 0) |
1250 | continue; |
1251 | |
1252 | atomic_inc(&clp->cl_count); |
1253 | spin_unlock(&nfs_client_lock); |
1254 | return clp; |
1255 | } |
1256 | spin_unlock(&nfs_client_lock); |
1257 | return NULL; |
1258 | } |
1259 | |
1260 | #else /* CONFIG_NFS_V4_1 */ |
1261 | |
1262 | struct nfs_client * |
1263 | nfs4_find_client_sessionid(const struct sockaddr *addr, |
1264 | struct nfs4_sessionid *sid) |
1265 | { |
1266 | return NULL; |
1267 | } |
1268 | #endif /* CONFIG_NFS_V4_1 */ |
1269 | |
1270 | /* |
1271 | * Initialize the NFS4 callback service |
1272 | */ |
1273 | static int nfs4_init_callback(struct nfs_client *clp) |
1274 | { |
1275 | int error; |
1276 | |
1277 | if (clp->rpc_ops->version == 4) { |
1278 | if (nfs4_has_session(clp)) { |
1279 | error = xprt_setup_backchannel( |
1280 | clp->cl_rpcclient->cl_xprt, |
1281 | NFS41_BC_MIN_CALLBACKS); |
1282 | if (error < 0) |
1283 | return error; |
1284 | } |
1285 | |
1286 | error = nfs_callback_up(clp->cl_mvops->minor_version, |
1287 | clp->cl_rpcclient->cl_xprt); |
1288 | if (error < 0) { |
1289 | dprintk("%s: failed to start callback. Error = %d\n", |
1290 | __func__, error); |
1291 | return error; |
1292 | } |
1293 | __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); |
1294 | } |
1295 | return 0; |
1296 | } |
1297 | |
1298 | /* |
1299 | * Initialize the minor version specific parts of an NFS4 client record |
1300 | */ |
1301 | static int nfs4_init_client_minor_version(struct nfs_client *clp) |
1302 | { |
1303 | #if defined(CONFIG_NFS_V4_1) |
1304 | if (clp->cl_mvops->minor_version) { |
1305 | struct nfs4_session *session = NULL; |
1306 | /* |
1307 | * Create the session and mark it expired. |
1308 | * When a SEQUENCE operation encounters the expired session |
1309 | * it will do session recovery to initialize it. |
1310 | */ |
1311 | session = nfs4_alloc_session(clp); |
1312 | if (!session) |
1313 | return -ENOMEM; |
1314 | |
1315 | clp->cl_session = session; |
1316 | /* |
1317 | * The create session reply races with the server back |
1318 | * channel probe. Mark the client NFS_CS_SESSION_INITING |
1319 | * so that the client back channel can find the |
1320 | * nfs_client struct |
1321 | */ |
1322 | clp->cl_cons_state = NFS_CS_SESSION_INITING; |
1323 | } |
1324 | #endif /* CONFIG_NFS_V4_1 */ |
1325 | |
1326 | return nfs4_init_callback(clp); |
1327 | } |
1328 | |
1329 | /* |
1330 | * Initialise an NFS4 client record |
1331 | */ |
1332 | int nfs4_init_client(struct nfs_client *clp, |
1333 | const struct rpc_timeout *timeparms, |
1334 | const char *ip_addr, |
1335 | rpc_authflavor_t authflavour, |
1336 | int noresvport) |
1337 | { |
1338 | int error; |
1339 | |
1340 | if (clp->cl_cons_state == NFS_CS_READY) { |
1341 | /* the client is initialised already */ |
1342 | dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); |
1343 | return 0; |
1344 | } |
1345 | |
1346 | /* Check NFS protocol revision and initialize RPC op vector */ |
1347 | clp->rpc_ops = &nfs_v4_clientops; |
1348 | |
1349 | error = nfs_create_rpc_client(clp, timeparms, authflavour, |
1350 | 1, noresvport); |
1351 | if (error < 0) |
1352 | goto error; |
1353 | strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); |
1354 | |
1355 | error = nfs_idmap_new(clp); |
1356 | if (error < 0) { |
1357 | dprintk("%s: failed to create idmapper. Error = %d\n", |
1358 | __func__, error); |
1359 | goto error; |
1360 | } |
1361 | __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); |
1362 | |
1363 | error = nfs4_init_client_minor_version(clp); |
1364 | if (error < 0) |
1365 | goto error; |
1366 | |
1367 | if (!nfs4_has_session(clp)) |
1368 | nfs_mark_client_ready(clp, NFS_CS_READY); |
1369 | return 0; |
1370 | |
1371 | error: |
1372 | nfs_mark_client_ready(clp, error); |
1373 | dprintk("<-- nfs4_init_client() = xerror %d\n", error); |
1374 | return error; |
1375 | } |
1376 | |
1377 | /* |
1378 | * Set up an NFS4 client |
1379 | */ |
1380 | static int nfs4_set_client(struct nfs_server *server, |
1381 | const char *hostname, |
1382 | const struct sockaddr *addr, |
1383 | const size_t addrlen, |
1384 | const char *ip_addr, |
1385 | rpc_authflavor_t authflavour, |
1386 | int proto, const struct rpc_timeout *timeparms, |
1387 | u32 minorversion) |
1388 | { |
1389 | struct nfs_client_initdata cl_init = { |
1390 | .hostname = hostname, |
1391 | .addr = addr, |
1392 | .addrlen = addrlen, |
1393 | .rpc_ops = &nfs_v4_clientops, |
1394 | .proto = proto, |
1395 | .minorversion = minorversion, |
1396 | }; |
1397 | struct nfs_client *clp; |
1398 | int error; |
1399 | |
1400 | dprintk("--> nfs4_set_client()\n"); |
1401 | |
1402 | /* Allocate or find a client reference we can use */ |
1403 | clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour, |
1404 | server->flags & NFS_MOUNT_NORESVPORT); |
1405 | if (IS_ERR(clp)) { |
1406 | error = PTR_ERR(clp); |
1407 | goto error; |
1408 | } |
1409 | |
1410 | /* |
1411 | * Query for the lease time on clientid setup or renewal |
1412 | * |
1413 | * Note that this will be set on nfs_clients that were created |
1414 | * only for the DS role and did not set this bit, but now will |
1415 | * serve a dual role. |
1416 | */ |
1417 | set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); |
1418 | |
1419 | server->nfs_client = clp; |
1420 | dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); |
1421 | return 0; |
1422 | error: |
1423 | dprintk("<-- nfs4_set_client() = xerror %d\n", error); |
1424 | return error; |
1425 | } |
1426 | |
1427 | /* |
1428 | * Set up a pNFS Data Server client. |
1429 | * |
1430 | * Return any existing nfs_client that matches server address,port,version |
1431 | * and minorversion. |
1432 | * |
1433 | * For a new nfs_client, use a soft mount (default), a low retrans and a |
1434 | * low timeout interval so that if a connection is lost, we retry through |
1435 | * the MDS. |
1436 | */ |
1437 | struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, |
1438 | const struct sockaddr *ds_addr, |
1439 | int ds_addrlen, int ds_proto) |
1440 | { |
1441 | struct nfs_client_initdata cl_init = { |
1442 | .addr = ds_addr, |
1443 | .addrlen = ds_addrlen, |
1444 | .rpc_ops = &nfs_v4_clientops, |
1445 | .proto = ds_proto, |
1446 | .minorversion = mds_clp->cl_minorversion, |
1447 | }; |
1448 | struct rpc_timeout ds_timeout = { |
1449 | .to_initval = 15 * HZ, |
1450 | .to_maxval = 15 * HZ, |
1451 | .to_retries = 1, |
1452 | .to_exponential = 1, |
1453 | }; |
1454 | struct nfs_client *clp; |
1455 | |
1456 | /* |
1457 | * Set an authflavor equual to the MDS value. Use the MDS nfs_client |
1458 | * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS |
1459 | * (section 13.1 RFC 5661). |
1460 | */ |
1461 | clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr, |
1462 | mds_clp->cl_rpcclient->cl_auth->au_flavor, 0); |
1463 | |
1464 | dprintk("<-- %s %p\n", __func__, clp); |
1465 | return clp; |
1466 | } |
1467 | EXPORT_SYMBOL(nfs4_set_ds_client); |
1468 | |
1469 | /* |
1470 | * Session has been established, and the client marked ready. |
1471 | * Set the mount rsize and wsize with negotiated fore channel |
1472 | * attributes which will be bound checked in nfs_server_set_fsinfo. |
1473 | */ |
1474 | static void nfs4_session_set_rwsize(struct nfs_server *server) |
1475 | { |
1476 | #ifdef CONFIG_NFS_V4_1 |
1477 | struct nfs4_session *sess; |
1478 | u32 server_resp_sz; |
1479 | u32 server_rqst_sz; |
1480 | |
1481 | if (!nfs4_has_session(server->nfs_client)) |
1482 | return; |
1483 | sess = server->nfs_client->cl_session; |
1484 | server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; |
1485 | server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; |
1486 | |
1487 | if (server->rsize > server_resp_sz) |
1488 | server->rsize = server_resp_sz; |
1489 | if (server->wsize > server_rqst_sz) |
1490 | server->wsize = server_rqst_sz; |
1491 | #endif /* CONFIG_NFS_V4_1 */ |
1492 | } |
1493 | |
1494 | static int nfs4_server_common_setup(struct nfs_server *server, |
1495 | struct nfs_fh *mntfh) |
1496 | { |
1497 | struct nfs_fattr *fattr; |
1498 | int error; |
1499 | |
1500 | BUG_ON(!server->nfs_client); |
1501 | BUG_ON(!server->nfs_client->rpc_ops); |
1502 | BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); |
1503 | |
1504 | /* data servers support only a subset of NFSv4.1 */ |
1505 | if (is_ds_only_client(server->nfs_client)) |
1506 | return -EPROTONOSUPPORT; |
1507 | |
1508 | fattr = nfs_alloc_fattr(); |
1509 | if (fattr == NULL) |
1510 | return -ENOMEM; |
1511 | |
1512 | /* We must ensure the session is initialised first */ |
1513 | error = nfs4_init_session(server); |
1514 | if (error < 0) |
1515 | goto out; |
1516 | |
1517 | /* Probe the root fh to retrieve its FSID and filehandle */ |
1518 | error = nfs4_get_rootfh(server, mntfh); |
1519 | if (error < 0) |
1520 | goto out; |
1521 | |
1522 | dprintk("Server FSID: %llx:%llx\n", |
1523 | (unsigned long long) server->fsid.major, |
1524 | (unsigned long long) server->fsid.minor); |
1525 | dprintk("Mount FH: %d\n", mntfh->size); |
1526 | |
1527 | nfs4_session_set_rwsize(server); |
1528 | |
1529 | error = nfs_probe_fsinfo(server, mntfh, fattr); |
1530 | if (error < 0) |
1531 | goto out; |
1532 | |
1533 | if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) |
1534 | server->namelen = NFS4_MAXNAMLEN; |
1535 | |
1536 | nfs_server_insert_lists(server); |
1537 | server->mount_time = jiffies; |
1538 | out: |
1539 | nfs_free_fattr(fattr); |
1540 | return error; |
1541 | } |
1542 | |
1543 | /* |
1544 | * Create a version 4 volume record |
1545 | */ |
1546 | static int nfs4_init_server(struct nfs_server *server, |
1547 | const struct nfs_parsed_mount_data *data) |
1548 | { |
1549 | struct rpc_timeout timeparms; |
1550 | int error; |
1551 | |
1552 | dprintk("--> nfs4_init_server()\n"); |
1553 | |
1554 | nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, |
1555 | data->timeo, data->retrans); |
1556 | |
1557 | /* Initialise the client representation from the mount data */ |
1558 | server->flags = data->flags; |
1559 | server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK; |
1560 | if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) |
1561 | server->caps |= NFS_CAP_READDIRPLUS; |
1562 | server->options = data->options; |
1563 | |
1564 | /* Get a client record */ |
1565 | error = nfs4_set_client(server, |
1566 | data->nfs_server.hostname, |
1567 | (const struct sockaddr *)&data->nfs_server.address, |
1568 | data->nfs_server.addrlen, |
1569 | data->client_address, |
1570 | data->auth_flavors[0], |
1571 | data->nfs_server.protocol, |
1572 | &timeparms, |
1573 | data->minorversion); |
1574 | if (error < 0) |
1575 | goto error; |
1576 | |
1577 | /* |
1578 | * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower |
1579 | * authentication. |
1580 | */ |
1581 | if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX) |
1582 | server->caps |= NFS_CAP_UIDGID_NOMAP; |
1583 | |
1584 | if (data->rsize) |
1585 | server->rsize = nfs_block_size(data->rsize, NULL); |
1586 | if (data->wsize) |
1587 | server->wsize = nfs_block_size(data->wsize, NULL); |
1588 | |
1589 | server->acregmin = data->acregmin * HZ; |
1590 | server->acregmax = data->acregmax * HZ; |
1591 | server->acdirmin = data->acdirmin * HZ; |
1592 | server->acdirmax = data->acdirmax * HZ; |
1593 | |
1594 | server->port = data->nfs_server.port; |
1595 | |
1596 | error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); |
1597 | |
1598 | error: |
1599 | /* Done */ |
1600 | dprintk("<-- nfs4_init_server() = %d\n", error); |
1601 | return error; |
1602 | } |
1603 | |
1604 | /* |
1605 | * Create a version 4 volume record |
1606 | * - keyed on server and FSID |
1607 | */ |
1608 | struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, |
1609 | struct nfs_fh *mntfh) |
1610 | { |
1611 | struct nfs_server *server; |
1612 | int error; |
1613 | |
1614 | dprintk("--> nfs4_create_server()\n"); |
1615 | |
1616 | server = nfs_alloc_server(); |
1617 | if (!server) |
1618 | return ERR_PTR(-ENOMEM); |
1619 | |
1620 | /* set up the general RPC client */ |
1621 | error = nfs4_init_server(server, data); |
1622 | if (error < 0) |
1623 | goto error; |
1624 | |
1625 | error = nfs4_server_common_setup(server, mntfh); |
1626 | if (error < 0) |
1627 | goto error; |
1628 | |
1629 | dprintk("<-- nfs4_create_server() = %p\n", server); |
1630 | return server; |
1631 | |
1632 | error: |
1633 | nfs_free_server(server); |
1634 | dprintk("<-- nfs4_create_server() = error %d\n", error); |
1635 | return ERR_PTR(error); |
1636 | } |
1637 | |
1638 | /* |
1639 | * Create an NFS4 referral server record |
1640 | */ |
1641 | struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, |
1642 | struct nfs_fh *mntfh) |
1643 | { |
1644 | struct nfs_client *parent_client; |
1645 | struct nfs_server *server, *parent_server; |
1646 | int error; |
1647 | |
1648 | dprintk("--> nfs4_create_referral_server()\n"); |
1649 | |
1650 | server = nfs_alloc_server(); |
1651 | if (!server) |
1652 | return ERR_PTR(-ENOMEM); |
1653 | |
1654 | parent_server = NFS_SB(data->sb); |
1655 | parent_client = parent_server->nfs_client; |
1656 | |
1657 | /* Initialise the client representation from the parent server */ |
1658 | nfs_server_copy_userdata(server, parent_server); |
1659 | server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; |
1660 | |
1661 | /* Get a client representation. |
1662 | * Note: NFSv4 always uses TCP, */ |
1663 | error = nfs4_set_client(server, data->hostname, |
1664 | data->addr, |
1665 | data->addrlen, |
1666 | parent_client->cl_ipaddr, |
1667 | data->authflavor, |
1668 | parent_server->client->cl_xprt->prot, |
1669 | parent_server->client->cl_timeout, |
1670 | parent_client->cl_mvops->minor_version); |
1671 | if (error < 0) |
1672 | goto error; |
1673 | |
1674 | error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); |
1675 | if (error < 0) |
1676 | goto error; |
1677 | |
1678 | error = nfs4_server_common_setup(server, mntfh); |
1679 | if (error < 0) |
1680 | goto error; |
1681 | |
1682 | dprintk("<-- nfs_create_referral_server() = %p\n", server); |
1683 | return server; |
1684 | |
1685 | error: |
1686 | nfs_free_server(server); |
1687 | dprintk("<-- nfs4_create_referral_server() = error %d\n", error); |
1688 | return ERR_PTR(error); |
1689 | } |
1690 | |
1691 | #endif /* CONFIG_NFS_V4 */ |
1692 | |
1693 | /* |
1694 | * Clone an NFS2, NFS3 or NFS4 server record |
1695 | */ |
1696 | struct nfs_server *nfs_clone_server(struct nfs_server *source, |
1697 | struct nfs_fh *fh, |
1698 | struct nfs_fattr *fattr) |
1699 | { |
1700 | struct nfs_server *server; |
1701 | struct nfs_fattr *fattr_fsinfo; |
1702 | int error; |
1703 | |
1704 | dprintk("--> nfs_clone_server(,%llx:%llx,)\n", |
1705 | (unsigned long long) fattr->fsid.major, |
1706 | (unsigned long long) fattr->fsid.minor); |
1707 | |
1708 | server = nfs_alloc_server(); |
1709 | if (!server) |
1710 | return ERR_PTR(-ENOMEM); |
1711 | |
1712 | error = -ENOMEM; |
1713 | fattr_fsinfo = nfs_alloc_fattr(); |
1714 | if (fattr_fsinfo == NULL) |
1715 | goto out_free_server; |
1716 | |
1717 | /* Copy data from the source */ |
1718 | server->nfs_client = source->nfs_client; |
1719 | atomic_inc(&server->nfs_client->cl_count); |
1720 | nfs_server_copy_userdata(server, source); |
1721 | |
1722 | server->fsid = fattr->fsid; |
1723 | |
1724 | error = nfs_init_server_rpcclient(server, |
1725 | source->client->cl_timeout, |
1726 | source->client->cl_auth->au_flavor); |
1727 | if (error < 0) |
1728 | goto out_free_server; |
1729 | if (!IS_ERR(source->client_acl)) |
1730 | nfs_init_server_aclclient(server); |
1731 | |
1732 | /* probe the filesystem info for this server filesystem */ |
1733 | error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); |
1734 | if (error < 0) |
1735 | goto out_free_server; |
1736 | |
1737 | if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) |
1738 | server->namelen = NFS4_MAXNAMLEN; |
1739 | |
1740 | dprintk("Cloned FSID: %llx:%llx\n", |
1741 | (unsigned long long) server->fsid.major, |
1742 | (unsigned long long) server->fsid.minor); |
1743 | |
1744 | error = nfs_start_lockd(server); |
1745 | if (error < 0) |
1746 | goto out_free_server; |
1747 | |
1748 | nfs_server_insert_lists(server); |
1749 | server->mount_time = jiffies; |
1750 | |
1751 | nfs_free_fattr(fattr_fsinfo); |
1752 | dprintk("<-- nfs_clone_server() = %p\n", server); |
1753 | return server; |
1754 | |
1755 | out_free_server: |
1756 | nfs_free_fattr(fattr_fsinfo); |
1757 | nfs_free_server(server); |
1758 | dprintk("<-- nfs_clone_server() = error %d\n", error); |
1759 | return ERR_PTR(error); |
1760 | } |
1761 | |
1762 | #ifdef CONFIG_PROC_FS |
1763 | static struct proc_dir_entry *proc_fs_nfs; |
1764 | |
1765 | static int nfs_server_list_open(struct inode *inode, struct file *file); |
1766 | static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); |
1767 | static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); |
1768 | static void nfs_server_list_stop(struct seq_file *p, void *v); |
1769 | static int nfs_server_list_show(struct seq_file *m, void *v); |
1770 | |
1771 | static const struct seq_operations nfs_server_list_ops = { |
1772 | .start = nfs_server_list_start, |
1773 | .next = nfs_server_list_next, |
1774 | .stop = nfs_server_list_stop, |
1775 | .show = nfs_server_list_show, |
1776 | }; |
1777 | |
1778 | static const struct file_operations nfs_server_list_fops = { |
1779 | .open = nfs_server_list_open, |
1780 | .read = seq_read, |
1781 | .llseek = seq_lseek, |
1782 | .release = seq_release, |
1783 | .owner = THIS_MODULE, |
1784 | }; |
1785 | |
1786 | static int nfs_volume_list_open(struct inode *inode, struct file *file); |
1787 | static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); |
1788 | static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); |
1789 | static void nfs_volume_list_stop(struct seq_file *p, void *v); |
1790 | static int nfs_volume_list_show(struct seq_file *m, void *v); |
1791 | |
1792 | static const struct seq_operations nfs_volume_list_ops = { |
1793 | .start = nfs_volume_list_start, |
1794 | .next = nfs_volume_list_next, |
1795 | .stop = nfs_volume_list_stop, |
1796 | .show = nfs_volume_list_show, |
1797 | }; |
1798 | |
1799 | static const struct file_operations nfs_volume_list_fops = { |
1800 | .open = nfs_volume_list_open, |
1801 | .read = seq_read, |
1802 | .llseek = seq_lseek, |
1803 | .release = seq_release, |
1804 | .owner = THIS_MODULE, |
1805 | }; |
1806 | |
1807 | /* |
1808 | * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which |
1809 | * we're dealing |
1810 | */ |
1811 | static int nfs_server_list_open(struct inode *inode, struct file *file) |
1812 | { |
1813 | struct seq_file *m; |
1814 | int ret; |
1815 | |
1816 | ret = seq_open(file, &nfs_server_list_ops); |
1817 | if (ret < 0) |
1818 | return ret; |
1819 | |
1820 | m = file->private_data; |
1821 | m->private = PDE(inode)->data; |
1822 | |
1823 | return 0; |
1824 | } |
1825 | |
1826 | /* |
1827 | * set up the iterator to start reading from the server list and return the first item |
1828 | */ |
1829 | static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) |
1830 | { |
1831 | /* lock the list against modification */ |
1832 | spin_lock(&nfs_client_lock); |
1833 | return seq_list_start_head(&nfs_client_list, *_pos); |
1834 | } |
1835 | |
1836 | /* |
1837 | * move to next server |
1838 | */ |
1839 | static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) |
1840 | { |
1841 | return seq_list_next(v, &nfs_client_list, pos); |
1842 | } |
1843 | |
1844 | /* |
1845 | * clean up after reading from the transports list |
1846 | */ |
1847 | static void nfs_server_list_stop(struct seq_file *p, void *v) |
1848 | { |
1849 | spin_unlock(&nfs_client_lock); |
1850 | } |
1851 | |
1852 | /* |
1853 | * display a header line followed by a load of call lines |
1854 | */ |
1855 | static int nfs_server_list_show(struct seq_file *m, void *v) |
1856 | { |
1857 | struct nfs_client *clp; |
1858 | |
1859 | /* display header on line 1 */ |
1860 | if (v == &nfs_client_list) { |
1861 | seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); |
1862 | return 0; |
1863 | } |
1864 | |
1865 | /* display one transport per line on subsequent lines */ |
1866 | clp = list_entry(v, struct nfs_client, cl_share_link); |
1867 | |
1868 | seq_printf(m, "v%u %s %s %3d %s\n", |
1869 | clp->rpc_ops->version, |
1870 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), |
1871 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), |
1872 | atomic_read(&clp->cl_count), |
1873 | clp->cl_hostname); |
1874 | |
1875 | return 0; |
1876 | } |
1877 | |
1878 | /* |
1879 | * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes |
1880 | */ |
1881 | static int nfs_volume_list_open(struct inode *inode, struct file *file) |
1882 | { |
1883 | struct seq_file *m; |
1884 | int ret; |
1885 | |
1886 | ret = seq_open(file, &nfs_volume_list_ops); |
1887 | if (ret < 0) |
1888 | return ret; |
1889 | |
1890 | m = file->private_data; |
1891 | m->private = PDE(inode)->data; |
1892 | |
1893 | return 0; |
1894 | } |
1895 | |
1896 | /* |
1897 | * set up the iterator to start reading from the volume list and return the first item |
1898 | */ |
1899 | static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) |
1900 | { |
1901 | /* lock the list against modification */ |
1902 | spin_lock(&nfs_client_lock); |
1903 | return seq_list_start_head(&nfs_volume_list, *_pos); |
1904 | } |
1905 | |
1906 | /* |
1907 | * move to next volume |
1908 | */ |
1909 | static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) |
1910 | { |
1911 | return seq_list_next(v, &nfs_volume_list, pos); |
1912 | } |
1913 | |
1914 | /* |
1915 | * clean up after reading from the transports list |
1916 | */ |
1917 | static void nfs_volume_list_stop(struct seq_file *p, void *v) |
1918 | { |
1919 | spin_unlock(&nfs_client_lock); |
1920 | } |
1921 | |
1922 | /* |
1923 | * display a header line followed by a load of call lines |
1924 | */ |
1925 | static int nfs_volume_list_show(struct seq_file *m, void *v) |
1926 | { |
1927 | struct nfs_server *server; |
1928 | struct nfs_client *clp; |
1929 | char dev[8], fsid[17]; |
1930 | |
1931 | /* display header on line 1 */ |
1932 | if (v == &nfs_volume_list) { |
1933 | seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); |
1934 | return 0; |
1935 | } |
1936 | /* display one transport per line on subsequent lines */ |
1937 | server = list_entry(v, struct nfs_server, master_link); |
1938 | clp = server->nfs_client; |
1939 | |
1940 | snprintf(dev, 8, "%u:%u", |
1941 | MAJOR(server->s_dev), MINOR(server->s_dev)); |
1942 | |
1943 | snprintf(fsid, 17, "%llx:%llx", |
1944 | (unsigned long long) server->fsid.major, |
1945 | (unsigned long long) server->fsid.minor); |
1946 | |
1947 | seq_printf(m, "v%u %s %s %-7s %-17s %s\n", |
1948 | clp->rpc_ops->version, |
1949 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), |
1950 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), |
1951 | dev, |
1952 | fsid, |
1953 | nfs_server_fscache_state(server)); |
1954 | |
1955 | return 0; |
1956 | } |
1957 | |
1958 | /* |
1959 | * initialise the /proc/fs/nfsfs/ directory |
1960 | */ |
1961 | int __init nfs_fs_proc_init(void) |
1962 | { |
1963 | struct proc_dir_entry *p; |
1964 | |
1965 | proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); |
1966 | if (!proc_fs_nfs) |
1967 | goto error_0; |
1968 | |
1969 | /* a file of servers with which we're dealing */ |
1970 | p = proc_create("servers", S_IFREG|S_IRUGO, |
1971 | proc_fs_nfs, &nfs_server_list_fops); |
1972 | if (!p) |
1973 | goto error_1; |
1974 | |
1975 | /* a file of volumes that we have mounted */ |
1976 | p = proc_create("volumes", S_IFREG|S_IRUGO, |
1977 | proc_fs_nfs, &nfs_volume_list_fops); |
1978 | if (!p) |
1979 | goto error_2; |
1980 | return 0; |
1981 | |
1982 | error_2: |
1983 | remove_proc_entry("servers", proc_fs_nfs); |
1984 | error_1: |
1985 | remove_proc_entry("fs/nfsfs", NULL); |
1986 | error_0: |
1987 | return -ENOMEM; |
1988 | } |
1989 | |
1990 | /* |
1991 | * clean up the /proc/fs/nfsfs/ directory |
1992 | */ |
1993 | void nfs_fs_proc_exit(void) |
1994 | { |
1995 | remove_proc_entry("volumes", proc_fs_nfs); |
1996 | remove_proc_entry("servers", proc_fs_nfs); |
1997 | remove_proc_entry("fs/nfsfs", NULL); |
1998 | } |
1999 | |
2000 | #endif /* CONFIG_PROC_FS */ |
2001 | |
2002 | module_param(nfs4_disable_idmapping, bool, 0644); |
2003 | MODULE_PARM_DESC(nfs4_disable_idmapping, |
2004 | "Turn off NFSv4 idmapping when using 'sec=sys'"); |
2005 |
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