1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* client.c: NFS client sharing and management code |
3 | * |
4 | * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. |
5 | * Written by David Howells (dhowells@redhat.com) |
6 | */ |
7 | |
8 | |
9 | #include <linux/module.h> |
10 | #include <linux/init.h> |
11 | #include <linux/sched.h> |
12 | #include <linux/time.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/mm.h> |
15 | #include <linux/string.h> |
16 | #include <linux/stat.h> |
17 | #include <linux/errno.h> |
18 | #include <linux/unistd.h> |
19 | #include <linux/sunrpc/addr.h> |
20 | #include <linux/sunrpc/clnt.h> |
21 | #include <linux/sunrpc/stats.h> |
22 | #include <linux/sunrpc/metrics.h> |
23 | #include <linux/sunrpc/xprtsock.h> |
24 | #include <linux/sunrpc/xprtrdma.h> |
25 | #include <linux/nfs_fs.h> |
26 | #include <linux/nfs_mount.h> |
27 | #include <linux/nfs4_mount.h> |
28 | #include <linux/lockd/bind.h> |
29 | #include <linux/seq_file.h> |
30 | #include <linux/mount.h> |
31 | #include <linux/vfs.h> |
32 | #include <linux/inet.h> |
33 | #include <linux/in6.h> |
34 | #include <linux/slab.h> |
35 | #include <linux/idr.h> |
36 | #include <net/ipv6.h> |
37 | #include <linux/nfs_xdr.h> |
38 | #include <linux/sunrpc/bc_xprt.h> |
39 | #include <linux/nsproxy.h> |
40 | #include <linux/pid_namespace.h> |
41 | |
42 | |
43 | #include "nfs4_fs.h" |
44 | #include "callback.h" |
45 | #include "delegation.h" |
46 | #include "iostat.h" |
47 | #include "internal.h" |
48 | #include "fscache.h" |
49 | #include "pnfs.h" |
50 | #include "nfs.h" |
51 | #include "netns.h" |
52 | #include "sysfs.h" |
53 | #include "nfs42.h" |
54 | |
55 | #define NFSDBG_FACILITY NFSDBG_CLIENT |
56 | |
57 | static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); |
58 | static DEFINE_SPINLOCK(nfs_version_lock); |
59 | static DEFINE_MUTEX(nfs_version_mutex); |
60 | static LIST_HEAD(nfs_versions); |
61 | |
62 | /* |
63 | * RPC cruft for NFS |
64 | */ |
65 | static const struct rpc_version *nfs_version[5] = { |
66 | [2] = NULL, |
67 | [3] = NULL, |
68 | [4] = NULL, |
69 | }; |
70 | |
71 | const struct rpc_program nfs_program = { |
72 | .name = "nfs" , |
73 | .number = NFS_PROGRAM, |
74 | .nrvers = ARRAY_SIZE(nfs_version), |
75 | .version = nfs_version, |
76 | .stats = &nfs_rpcstat, |
77 | .pipe_dir_name = NFS_PIPE_DIRNAME, |
78 | }; |
79 | |
80 | struct rpc_stat nfs_rpcstat = { |
81 | .program = &nfs_program |
82 | }; |
83 | |
84 | static struct nfs_subversion *find_nfs_version(unsigned int version) |
85 | { |
86 | struct nfs_subversion *nfs; |
87 | spin_lock(lock: &nfs_version_lock); |
88 | |
89 | list_for_each_entry(nfs, &nfs_versions, list) { |
90 | if (nfs->rpc_ops->version == version) { |
91 | spin_unlock(lock: &nfs_version_lock); |
92 | return nfs; |
93 | } |
94 | } |
95 | |
96 | spin_unlock(lock: &nfs_version_lock); |
97 | return ERR_PTR(error: -EPROTONOSUPPORT); |
98 | } |
99 | |
100 | struct nfs_subversion *get_nfs_version(unsigned int version) |
101 | { |
102 | struct nfs_subversion *nfs = find_nfs_version(version); |
103 | |
104 | if (IS_ERR(ptr: nfs)) { |
105 | mutex_lock(&nfs_version_mutex); |
106 | request_module("nfsv%d" , version); |
107 | nfs = find_nfs_version(version); |
108 | mutex_unlock(lock: &nfs_version_mutex); |
109 | } |
110 | |
111 | if (!IS_ERR(ptr: nfs) && !try_module_get(module: nfs->owner)) |
112 | return ERR_PTR(error: -EAGAIN); |
113 | return nfs; |
114 | } |
115 | |
116 | void put_nfs_version(struct nfs_subversion *nfs) |
117 | { |
118 | module_put(module: nfs->owner); |
119 | } |
120 | |
121 | void register_nfs_version(struct nfs_subversion *nfs) |
122 | { |
123 | spin_lock(lock: &nfs_version_lock); |
124 | |
125 | list_add(new: &nfs->list, head: &nfs_versions); |
126 | nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; |
127 | |
128 | spin_unlock(lock: &nfs_version_lock); |
129 | } |
130 | EXPORT_SYMBOL_GPL(register_nfs_version); |
131 | |
132 | void unregister_nfs_version(struct nfs_subversion *nfs) |
133 | { |
134 | spin_lock(lock: &nfs_version_lock); |
135 | |
136 | nfs_version[nfs->rpc_ops->version] = NULL; |
137 | list_del(entry: &nfs->list); |
138 | |
139 | spin_unlock(lock: &nfs_version_lock); |
140 | } |
141 | EXPORT_SYMBOL_GPL(unregister_nfs_version); |
142 | |
143 | /* |
144 | * Allocate a shared client record |
145 | * |
146 | * Since these are allocated/deallocated very rarely, we don't |
147 | * bother putting them in a slab cache... |
148 | */ |
149 | struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) |
150 | { |
151 | struct nfs_client *clp; |
152 | int err = -ENOMEM; |
153 | |
154 | if ((clp = kzalloc(size: sizeof(*clp), GFP_KERNEL)) == NULL) |
155 | goto error_0; |
156 | |
157 | clp->cl_minorversion = cl_init->minorversion; |
158 | clp->cl_nfs_mod = cl_init->nfs_mod; |
159 | if (!try_module_get(module: clp->cl_nfs_mod->owner)) |
160 | goto error_dealloc; |
161 | |
162 | clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; |
163 | |
164 | refcount_set(r: &clp->cl_count, n: 1); |
165 | clp->cl_cons_state = NFS_CS_INITING; |
166 | |
167 | memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); |
168 | clp->cl_addrlen = cl_init->addrlen; |
169 | |
170 | if (cl_init->hostname) { |
171 | err = -ENOMEM; |
172 | clp->cl_hostname = kstrdup(s: cl_init->hostname, GFP_KERNEL); |
173 | if (!clp->cl_hostname) |
174 | goto error_cleanup; |
175 | } |
176 | |
177 | INIT_LIST_HEAD(list: &clp->cl_superblocks); |
178 | clp->cl_rpcclient = ERR_PTR(error: -EINVAL); |
179 | |
180 | clp->cl_flags = cl_init->init_flags; |
181 | clp->cl_proto = cl_init->proto; |
182 | clp->cl_nconnect = cl_init->nconnect; |
183 | clp->cl_max_connect = cl_init->max_connect ? cl_init->max_connect : 1; |
184 | clp->cl_net = get_net(net: cl_init->net); |
185 | |
186 | clp->cl_principal = "*" ; |
187 | clp->cl_xprtsec = cl_init->xprtsec; |
188 | return clp; |
189 | |
190 | error_cleanup: |
191 | put_nfs_version(nfs: clp->cl_nfs_mod); |
192 | error_dealloc: |
193 | kfree(objp: clp); |
194 | error_0: |
195 | return ERR_PTR(error: err); |
196 | } |
197 | EXPORT_SYMBOL_GPL(nfs_alloc_client); |
198 | |
199 | #if IS_ENABLED(CONFIG_NFS_V4) |
200 | static void nfs_cleanup_cb_ident_idr(struct net *net) |
201 | { |
202 | struct nfs_net *nn = net_generic(net, id: nfs_net_id); |
203 | |
204 | idr_destroy(&nn->cb_ident_idr); |
205 | } |
206 | |
207 | /* nfs_client_lock held */ |
208 | static void nfs_cb_idr_remove_locked(struct nfs_client *clp) |
209 | { |
210 | struct nfs_net *nn = net_generic(net: clp->cl_net, id: nfs_net_id); |
211 | |
212 | if (clp->cl_cb_ident) |
213 | idr_remove(&nn->cb_ident_idr, id: clp->cl_cb_ident); |
214 | } |
215 | |
216 | static void pnfs_init_server(struct nfs_server *server) |
217 | { |
218 | rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC" ); |
219 | } |
220 | |
221 | #else |
222 | static void nfs_cleanup_cb_ident_idr(struct net *net) |
223 | { |
224 | } |
225 | |
226 | static void nfs_cb_idr_remove_locked(struct nfs_client *clp) |
227 | { |
228 | } |
229 | |
230 | static void pnfs_init_server(struct nfs_server *server) |
231 | { |
232 | } |
233 | |
234 | #endif /* CONFIG_NFS_V4 */ |
235 | |
236 | /* |
237 | * Destroy a shared client record |
238 | */ |
239 | void nfs_free_client(struct nfs_client *clp) |
240 | { |
241 | /* -EIO all pending I/O */ |
242 | if (!IS_ERR(ptr: clp->cl_rpcclient)) |
243 | rpc_shutdown_client(clp->cl_rpcclient); |
244 | |
245 | put_net(net: clp->cl_net); |
246 | put_nfs_version(nfs: clp->cl_nfs_mod); |
247 | kfree(objp: clp->cl_hostname); |
248 | kfree(objp: clp->cl_acceptor); |
249 | kfree(objp: clp); |
250 | } |
251 | EXPORT_SYMBOL_GPL(nfs_free_client); |
252 | |
253 | /* |
254 | * Release a reference to a shared client record |
255 | */ |
256 | void nfs_put_client(struct nfs_client *clp) |
257 | { |
258 | struct nfs_net *nn; |
259 | |
260 | if (!clp) |
261 | return; |
262 | |
263 | nn = net_generic(net: clp->cl_net, id: nfs_net_id); |
264 | |
265 | if (refcount_dec_and_lock(r: &clp->cl_count, lock: &nn->nfs_client_lock)) { |
266 | list_del(entry: &clp->cl_share_link); |
267 | nfs_cb_idr_remove_locked(clp); |
268 | spin_unlock(lock: &nn->nfs_client_lock); |
269 | |
270 | WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); |
271 | |
272 | clp->rpc_ops->free_client(clp); |
273 | } |
274 | } |
275 | EXPORT_SYMBOL_GPL(nfs_put_client); |
276 | |
277 | /* |
278 | * Find an nfs_client on the list that matches the initialisation data |
279 | * that is supplied. |
280 | */ |
281 | static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) |
282 | { |
283 | struct nfs_client *clp; |
284 | const struct sockaddr *sap = (struct sockaddr *)data->addr; |
285 | struct nfs_net *nn = net_generic(net: data->net, id: nfs_net_id); |
286 | int error; |
287 | |
288 | again: |
289 | list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { |
290 | const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; |
291 | /* Don't match clients that failed to initialise properly */ |
292 | if (clp->cl_cons_state < 0) |
293 | continue; |
294 | |
295 | /* If a client is still initializing then we need to wait */ |
296 | if (clp->cl_cons_state > NFS_CS_READY) { |
297 | refcount_inc(r: &clp->cl_count); |
298 | spin_unlock(lock: &nn->nfs_client_lock); |
299 | error = nfs_wait_client_init_complete(clp); |
300 | nfs_put_client(clp); |
301 | spin_lock(lock: &nn->nfs_client_lock); |
302 | if (error < 0) |
303 | return ERR_PTR(error); |
304 | goto again; |
305 | } |
306 | |
307 | /* Different NFS versions cannot share the same nfs_client */ |
308 | if (clp->rpc_ops != data->nfs_mod->rpc_ops) |
309 | continue; |
310 | |
311 | if (clp->cl_proto != data->proto) |
312 | continue; |
313 | /* Match nfsv4 minorversion */ |
314 | if (clp->cl_minorversion != data->minorversion) |
315 | continue; |
316 | |
317 | /* Match request for a dedicated DS */ |
318 | if (test_bit(NFS_CS_DS, &data->init_flags) != |
319 | test_bit(NFS_CS_DS, &clp->cl_flags)) |
320 | continue; |
321 | |
322 | /* Match the full socket address */ |
323 | if (!rpc_cmp_addr_port(sap1: sap, sap2: clap)) |
324 | /* Match all xprt_switch full socket addresses */ |
325 | if (IS_ERR(ptr: clp->cl_rpcclient) || |
326 | !rpc_clnt_xprt_switch_has_addr(clnt: clp->cl_rpcclient, |
327 | sap)) |
328 | continue; |
329 | |
330 | /* Match the xprt security policy */ |
331 | if (clp->cl_xprtsec.policy != data->xprtsec.policy) |
332 | continue; |
333 | |
334 | refcount_inc(r: &clp->cl_count); |
335 | return clp; |
336 | } |
337 | return NULL; |
338 | } |
339 | |
340 | /* |
341 | * Return true if @clp is done initializing, false if still working on it. |
342 | * |
343 | * Use nfs_client_init_status to check if it was successful. |
344 | */ |
345 | bool nfs_client_init_is_complete(const struct nfs_client *clp) |
346 | { |
347 | return clp->cl_cons_state <= NFS_CS_READY; |
348 | } |
349 | EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); |
350 | |
351 | /* |
352 | * Return 0 if @clp was successfully initialized, -errno otherwise. |
353 | * |
354 | * This must be called *after* nfs_client_init_is_complete() returns true, |
355 | * otherwise it will pop WARN_ON_ONCE and return -EINVAL |
356 | */ |
357 | int nfs_client_init_status(const struct nfs_client *clp) |
358 | { |
359 | /* called without checking nfs_client_init_is_complete */ |
360 | if (clp->cl_cons_state > NFS_CS_READY) { |
361 | WARN_ON_ONCE(1); |
362 | return -EINVAL; |
363 | } |
364 | return clp->cl_cons_state; |
365 | } |
366 | EXPORT_SYMBOL_GPL(nfs_client_init_status); |
367 | |
368 | int nfs_wait_client_init_complete(const struct nfs_client *clp) |
369 | { |
370 | return wait_event_killable(nfs_client_active_wq, |
371 | nfs_client_init_is_complete(clp)); |
372 | } |
373 | EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); |
374 | |
375 | /* |
376 | * Found an existing client. Make sure it's ready before returning. |
377 | */ |
378 | static struct nfs_client * |
379 | nfs_found_client(const struct nfs_client_initdata *cl_init, |
380 | struct nfs_client *clp) |
381 | { |
382 | int error; |
383 | |
384 | error = nfs_wait_client_init_complete(clp); |
385 | if (error < 0) { |
386 | nfs_put_client(clp); |
387 | return ERR_PTR(error: -ERESTARTSYS); |
388 | } |
389 | |
390 | if (clp->cl_cons_state < NFS_CS_READY) { |
391 | error = clp->cl_cons_state; |
392 | nfs_put_client(clp); |
393 | return ERR_PTR(error); |
394 | } |
395 | |
396 | smp_rmb(); |
397 | return clp; |
398 | } |
399 | |
400 | /* |
401 | * Look up a client by IP address and protocol version |
402 | * - creates a new record if one doesn't yet exist |
403 | */ |
404 | struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) |
405 | { |
406 | struct nfs_client *clp, *new = NULL; |
407 | struct nfs_net *nn = net_generic(net: cl_init->net, id: nfs_net_id); |
408 | const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; |
409 | |
410 | if (cl_init->hostname == NULL) { |
411 | WARN_ON(1); |
412 | return ERR_PTR(error: -EINVAL); |
413 | } |
414 | |
415 | /* see if the client already exists */ |
416 | do { |
417 | spin_lock(lock: &nn->nfs_client_lock); |
418 | |
419 | clp = nfs_match_client(data: cl_init); |
420 | if (clp) { |
421 | spin_unlock(lock: &nn->nfs_client_lock); |
422 | if (new) |
423 | new->rpc_ops->free_client(new); |
424 | if (IS_ERR(ptr: clp)) |
425 | return clp; |
426 | return nfs_found_client(cl_init, clp); |
427 | } |
428 | if (new) { |
429 | list_add_tail(new: &new->cl_share_link, |
430 | head: &nn->nfs_client_list); |
431 | spin_unlock(lock: &nn->nfs_client_lock); |
432 | return rpc_ops->init_client(new, cl_init); |
433 | } |
434 | |
435 | spin_unlock(lock: &nn->nfs_client_lock); |
436 | |
437 | new = rpc_ops->alloc_client(cl_init); |
438 | } while (!IS_ERR(ptr: new)); |
439 | |
440 | return new; |
441 | } |
442 | EXPORT_SYMBOL_GPL(nfs_get_client); |
443 | |
444 | /* |
445 | * Mark a server as ready or failed |
446 | */ |
447 | void nfs_mark_client_ready(struct nfs_client *clp, int state) |
448 | { |
449 | smp_wmb(); |
450 | clp->cl_cons_state = state; |
451 | wake_up_all(&nfs_client_active_wq); |
452 | } |
453 | EXPORT_SYMBOL_GPL(nfs_mark_client_ready); |
454 | |
455 | /* |
456 | * Initialise the timeout values for a connection |
457 | */ |
458 | void nfs_init_timeout_values(struct rpc_timeout *to, int proto, |
459 | int timeo, int retrans) |
460 | { |
461 | to->to_initval = timeo * HZ / 10; |
462 | to->to_retries = retrans; |
463 | |
464 | switch (proto) { |
465 | case XPRT_TRANSPORT_TCP: |
466 | case XPRT_TRANSPORT_TCP_TLS: |
467 | case XPRT_TRANSPORT_RDMA: |
468 | if (retrans == NFS_UNSPEC_RETRANS) |
469 | to->to_retries = NFS_DEF_TCP_RETRANS; |
470 | if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) |
471 | to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; |
472 | if (to->to_initval > NFS_MAX_TCP_TIMEOUT) |
473 | to->to_initval = NFS_MAX_TCP_TIMEOUT; |
474 | to->to_increment = to->to_initval; |
475 | to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); |
476 | if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) |
477 | to->to_maxval = NFS_MAX_TCP_TIMEOUT; |
478 | if (to->to_maxval < to->to_initval) |
479 | to->to_maxval = to->to_initval; |
480 | to->to_exponential = 0; |
481 | break; |
482 | case XPRT_TRANSPORT_UDP: |
483 | if (retrans == NFS_UNSPEC_RETRANS) |
484 | to->to_retries = NFS_DEF_UDP_RETRANS; |
485 | if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) |
486 | to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; |
487 | if (to->to_initval > NFS_MAX_UDP_TIMEOUT) |
488 | to->to_initval = NFS_MAX_UDP_TIMEOUT; |
489 | to->to_maxval = NFS_MAX_UDP_TIMEOUT; |
490 | to->to_exponential = 1; |
491 | break; |
492 | default: |
493 | BUG(); |
494 | } |
495 | } |
496 | EXPORT_SYMBOL_GPL(nfs_init_timeout_values); |
497 | |
498 | /* |
499 | * Create an RPC client handle |
500 | */ |
501 | int nfs_create_rpc_client(struct nfs_client *clp, |
502 | const struct nfs_client_initdata *cl_init, |
503 | rpc_authflavor_t flavor) |
504 | { |
505 | struct rpc_clnt *clnt = NULL; |
506 | struct rpc_create_args args = { |
507 | .net = clp->cl_net, |
508 | .protocol = clp->cl_proto, |
509 | .nconnect = clp->cl_nconnect, |
510 | .address = (struct sockaddr *)&clp->cl_addr, |
511 | .addrsize = clp->cl_addrlen, |
512 | .timeout = cl_init->timeparms, |
513 | .servername = clp->cl_hostname, |
514 | .nodename = cl_init->nodename, |
515 | .program = &nfs_program, |
516 | .version = clp->rpc_ops->version, |
517 | .authflavor = flavor, |
518 | .cred = cl_init->cred, |
519 | .xprtsec = cl_init->xprtsec, |
520 | .connect_timeout = cl_init->connect_timeout, |
521 | .reconnect_timeout = cl_init->reconnect_timeout, |
522 | }; |
523 | |
524 | if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) |
525 | args.flags |= RPC_CLNT_CREATE_DISCRTRY; |
526 | if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) |
527 | args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; |
528 | if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) |
529 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; |
530 | if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) |
531 | args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; |
532 | if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) |
533 | args.flags |= RPC_CLNT_CREATE_NOPING; |
534 | if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) |
535 | args.flags |= RPC_CLNT_CREATE_REUSEPORT; |
536 | |
537 | if (!IS_ERR(ptr: clp->cl_rpcclient)) |
538 | return 0; |
539 | |
540 | clnt = rpc_create(args: &args); |
541 | if (IS_ERR(ptr: clnt)) { |
542 | dprintk("%s: cannot create RPC client. Error = %ld\n" , |
543 | __func__, PTR_ERR(clnt)); |
544 | return PTR_ERR(ptr: clnt); |
545 | } |
546 | |
547 | clnt->cl_principal = clp->cl_principal; |
548 | clp->cl_rpcclient = clnt; |
549 | clnt->cl_max_connect = clp->cl_max_connect; |
550 | return 0; |
551 | } |
552 | EXPORT_SYMBOL_GPL(nfs_create_rpc_client); |
553 | |
554 | /* |
555 | * Version 2 or 3 client destruction |
556 | */ |
557 | static void nfs_destroy_server(struct nfs_server *server) |
558 | { |
559 | if (server->nlm_host) |
560 | nlmclnt_done(host: server->nlm_host); |
561 | } |
562 | |
563 | /* |
564 | * Version 2 or 3 lockd setup |
565 | */ |
566 | static int nfs_start_lockd(struct nfs_server *server) |
567 | { |
568 | struct nlm_host *host; |
569 | struct nfs_client *clp = server->nfs_client; |
570 | struct nlmclnt_initdata nlm_init = { |
571 | .hostname = clp->cl_hostname, |
572 | .address = (struct sockaddr *)&clp->cl_addr, |
573 | .addrlen = clp->cl_addrlen, |
574 | .nfs_version = clp->rpc_ops->version, |
575 | .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? |
576 | 1 : 0, |
577 | .net = clp->cl_net, |
578 | .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, |
579 | .cred = server->cred, |
580 | }; |
581 | |
582 | if (nlm_init.nfs_version > 3) |
583 | return 0; |
584 | if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && |
585 | (server->flags & NFS_MOUNT_LOCAL_FCNTL)) |
586 | return 0; |
587 | |
588 | switch (clp->cl_proto) { |
589 | default: |
590 | nlm_init.protocol = IPPROTO_TCP; |
591 | break; |
592 | #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT |
593 | case XPRT_TRANSPORT_UDP: |
594 | nlm_init.protocol = IPPROTO_UDP; |
595 | #endif |
596 | } |
597 | |
598 | host = nlmclnt_init(nlm_init: &nlm_init); |
599 | if (IS_ERR(ptr: host)) |
600 | return PTR_ERR(ptr: host); |
601 | |
602 | server->nlm_host = host; |
603 | server->destroy = nfs_destroy_server; |
604 | nfs_sysfs_link_rpc_client(server, clnt: nlmclnt_rpc_clnt(host), NULL); |
605 | return 0; |
606 | } |
607 | |
608 | /* |
609 | * Create a general RPC client |
610 | */ |
611 | int nfs_init_server_rpcclient(struct nfs_server *server, |
612 | const struct rpc_timeout *timeo, |
613 | rpc_authflavor_t pseudoflavour) |
614 | { |
615 | struct nfs_client *clp = server->nfs_client; |
616 | |
617 | server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, |
618 | pseudoflavour); |
619 | if (IS_ERR(ptr: server->client)) { |
620 | dprintk("%s: couldn't create rpc_client!\n" , __func__); |
621 | return PTR_ERR(ptr: server->client); |
622 | } |
623 | |
624 | memcpy(&server->client->cl_timeout_default, |
625 | timeo, |
626 | sizeof(server->client->cl_timeout_default)); |
627 | server->client->cl_timeout = &server->client->cl_timeout_default; |
628 | server->client->cl_softrtry = 0; |
629 | if (server->flags & NFS_MOUNT_SOFTERR) |
630 | server->client->cl_softerr = 1; |
631 | if (server->flags & NFS_MOUNT_SOFT) |
632 | server->client->cl_softrtry = 1; |
633 | |
634 | nfs_sysfs_link_rpc_client(server, clnt: server->client, NULL); |
635 | return 0; |
636 | } |
637 | EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); |
638 | |
639 | /** |
640 | * nfs_init_client - Initialise an NFS2 or NFS3 client |
641 | * |
642 | * @clp: nfs_client to initialise |
643 | * @cl_init: Initialisation parameters |
644 | * |
645 | * Returns pointer to an NFS client, or an ERR_PTR value. |
646 | */ |
647 | struct nfs_client *nfs_init_client(struct nfs_client *clp, |
648 | const struct nfs_client_initdata *cl_init) |
649 | { |
650 | int error; |
651 | |
652 | /* the client is already initialised */ |
653 | if (clp->cl_cons_state == NFS_CS_READY) |
654 | return clp; |
655 | |
656 | /* |
657 | * Create a client RPC handle for doing FSSTAT with UNIX auth only |
658 | * - RFC 2623, sec 2.3.2 |
659 | */ |
660 | error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); |
661 | nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); |
662 | if (error < 0) { |
663 | nfs_put_client(clp); |
664 | clp = ERR_PTR(error); |
665 | } |
666 | return clp; |
667 | } |
668 | EXPORT_SYMBOL_GPL(nfs_init_client); |
669 | |
670 | /* |
671 | * Create a version 2 or 3 client |
672 | */ |
673 | static int nfs_init_server(struct nfs_server *server, |
674 | const struct fs_context *fc) |
675 | { |
676 | const struct nfs_fs_context *ctx = nfs_fc2context(fc); |
677 | struct rpc_timeout timeparms; |
678 | struct nfs_client_initdata cl_init = { |
679 | .hostname = ctx->nfs_server.hostname, |
680 | .addr = &ctx->nfs_server._address, |
681 | .addrlen = ctx->nfs_server.addrlen, |
682 | .nfs_mod = ctx->nfs_mod, |
683 | .proto = ctx->nfs_server.protocol, |
684 | .net = fc->net_ns, |
685 | .timeparms = &timeparms, |
686 | .cred = server->cred, |
687 | .nconnect = ctx->nfs_server.nconnect, |
688 | .init_flags = (1UL << NFS_CS_REUSEPORT), |
689 | .xprtsec = ctx->xprtsec, |
690 | }; |
691 | struct nfs_client *clp; |
692 | int error; |
693 | |
694 | nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, |
695 | ctx->timeo, ctx->retrans); |
696 | if (ctx->flags & NFS_MOUNT_NORESVPORT) |
697 | set_bit(NFS_CS_NORESVPORT, addr: &cl_init.init_flags); |
698 | |
699 | /* Allocate or find a client reference we can use */ |
700 | clp = nfs_get_client(&cl_init); |
701 | if (IS_ERR(ptr: clp)) |
702 | return PTR_ERR(ptr: clp); |
703 | |
704 | server->nfs_client = clp; |
705 | nfs_sysfs_add_server(s: server); |
706 | nfs_sysfs_link_rpc_client(server, clnt: clp->cl_rpcclient, sysfs_prefix: "_state" ); |
707 | |
708 | /* Initialise the client representation from the mount data */ |
709 | server->flags = ctx->flags; |
710 | server->options = ctx->options; |
711 | server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; |
712 | |
713 | switch (clp->rpc_ops->version) { |
714 | case 2: |
715 | server->fattr_valid = NFS_ATTR_FATTR_V2; |
716 | break; |
717 | case 3: |
718 | server->fattr_valid = NFS_ATTR_FATTR_V3; |
719 | break; |
720 | default: |
721 | server->fattr_valid = NFS_ATTR_FATTR_V4; |
722 | } |
723 | |
724 | if (ctx->rsize) |
725 | server->rsize = nfs_io_size(iosize: ctx->rsize, proto: clp->cl_proto); |
726 | if (ctx->wsize) |
727 | server->wsize = nfs_io_size(iosize: ctx->wsize, proto: clp->cl_proto); |
728 | |
729 | server->acregmin = ctx->acregmin * HZ; |
730 | server->acregmax = ctx->acregmax * HZ; |
731 | server->acdirmin = ctx->acdirmin * HZ; |
732 | server->acdirmax = ctx->acdirmax * HZ; |
733 | |
734 | /* Start lockd here, before we might error out */ |
735 | error = nfs_start_lockd(server); |
736 | if (error < 0) |
737 | goto error; |
738 | |
739 | server->port = ctx->nfs_server.port; |
740 | server->auth_info = ctx->auth_info; |
741 | |
742 | error = nfs_init_server_rpcclient(server, &timeparms, |
743 | ctx->selected_flavor); |
744 | if (error < 0) |
745 | goto error; |
746 | |
747 | /* Preserve the values of mount_server-related mount options */ |
748 | if (ctx->mount_server.addrlen) { |
749 | memcpy(&server->mountd_address, &ctx->mount_server.address, |
750 | ctx->mount_server.addrlen); |
751 | server->mountd_addrlen = ctx->mount_server.addrlen; |
752 | } |
753 | server->mountd_version = ctx->mount_server.version; |
754 | server->mountd_port = ctx->mount_server.port; |
755 | server->mountd_protocol = ctx->mount_server.protocol; |
756 | |
757 | server->namelen = ctx->namlen; |
758 | return 0; |
759 | |
760 | error: |
761 | server->nfs_client = NULL; |
762 | nfs_put_client(clp); |
763 | return error; |
764 | } |
765 | |
766 | /* |
767 | * Load up the server record from information gained in an fsinfo record |
768 | */ |
769 | static void nfs_server_set_fsinfo(struct nfs_server *server, |
770 | struct nfs_fsinfo *fsinfo) |
771 | { |
772 | struct nfs_client *clp = server->nfs_client; |
773 | unsigned long max_rpc_payload, raw_max_rpc_payload; |
774 | |
775 | /* Work out a lot of parameters */ |
776 | if (server->rsize == 0) |
777 | server->rsize = nfs_io_size(iosize: fsinfo->rtpref, proto: clp->cl_proto); |
778 | if (server->wsize == 0) |
779 | server->wsize = nfs_io_size(iosize: fsinfo->wtpref, proto: clp->cl_proto); |
780 | |
781 | if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) |
782 | server->rsize = nfs_io_size(iosize: fsinfo->rtmax, proto: clp->cl_proto); |
783 | if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) |
784 | server->wsize = nfs_io_size(iosize: fsinfo->wtmax, proto: clp->cl_proto); |
785 | |
786 | raw_max_rpc_payload = rpc_max_payload(server->client); |
787 | max_rpc_payload = nfs_block_size(bsize: raw_max_rpc_payload, NULL); |
788 | |
789 | if (server->rsize > max_rpc_payload) |
790 | server->rsize = max_rpc_payload; |
791 | if (server->rsize > NFS_MAX_FILE_IO_SIZE) |
792 | server->rsize = NFS_MAX_FILE_IO_SIZE; |
793 | server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; |
794 | |
795 | if (server->wsize > max_rpc_payload) |
796 | server->wsize = max_rpc_payload; |
797 | if (server->wsize > NFS_MAX_FILE_IO_SIZE) |
798 | server->wsize = NFS_MAX_FILE_IO_SIZE; |
799 | server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; |
800 | |
801 | server->wtmult = nfs_block_bits(bsize: fsinfo->wtmult, NULL); |
802 | |
803 | server->dtsize = nfs_block_size(bsize: fsinfo->dtpref, NULL); |
804 | if (server->dtsize > NFS_MAX_FILE_IO_SIZE) |
805 | server->dtsize = NFS_MAX_FILE_IO_SIZE; |
806 | if (server->dtsize > server->rsize) |
807 | server->dtsize = server->rsize; |
808 | |
809 | if (server->flags & NFS_MOUNT_NOAC) { |
810 | server->acregmin = server->acregmax = 0; |
811 | server->acdirmin = server->acdirmax = 0; |
812 | } |
813 | |
814 | server->maxfilesize = fsinfo->maxfilesize; |
815 | |
816 | server->time_delta = fsinfo->time_delta; |
817 | server->change_attr_type = fsinfo->change_attr_type; |
818 | |
819 | server->clone_blksize = fsinfo->clone_blksize; |
820 | /* We're airborne Set socket buffersize */ |
821 | rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); |
822 | |
823 | #ifdef CONFIG_NFS_V4_2 |
824 | /* |
825 | * Defaults until limited by the session parameters. |
826 | */ |
827 | server->gxasize = min_t(unsigned int, raw_max_rpc_payload, |
828 | XATTR_SIZE_MAX); |
829 | server->sxasize = min_t(unsigned int, raw_max_rpc_payload, |
830 | XATTR_SIZE_MAX); |
831 | server->lxasize = min_t(unsigned int, raw_max_rpc_payload, |
832 | nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); |
833 | |
834 | if (fsinfo->xattr_support) |
835 | server->caps |= NFS_CAP_XATTR; |
836 | #endif |
837 | } |
838 | |
839 | /* |
840 | * Probe filesystem information, including the FSID on v2/v3 |
841 | */ |
842 | static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) |
843 | { |
844 | struct nfs_fsinfo fsinfo; |
845 | struct nfs_client *clp = server->nfs_client; |
846 | int error; |
847 | |
848 | if (clp->rpc_ops->set_capabilities != NULL) { |
849 | error = clp->rpc_ops->set_capabilities(server, mntfh); |
850 | if (error < 0) |
851 | return error; |
852 | } |
853 | |
854 | fsinfo.fattr = fattr; |
855 | fsinfo.nlayouttypes = 0; |
856 | memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); |
857 | error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); |
858 | if (error < 0) |
859 | return error; |
860 | |
861 | nfs_server_set_fsinfo(server, fsinfo: &fsinfo); |
862 | |
863 | /* Get some general file system info */ |
864 | if (server->namelen == 0) { |
865 | struct nfs_pathconf pathinfo; |
866 | |
867 | pathinfo.fattr = fattr; |
868 | nfs_fattr_init(fattr); |
869 | |
870 | if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) |
871 | server->namelen = pathinfo.max_namelen; |
872 | } |
873 | |
874 | if (clp->rpc_ops->discover_trunking != NULL && |
875 | (server->caps & NFS_CAP_FS_LOCATIONS && |
876 | (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) { |
877 | error = clp->rpc_ops->discover_trunking(server, mntfh); |
878 | if (error < 0) |
879 | return error; |
880 | } |
881 | |
882 | return 0; |
883 | } |
884 | |
885 | /* |
886 | * Grab the destination's particulars, including lease expiry time. |
887 | * |
888 | * Returns zero if probe succeeded and retrieved FSID matches the FSID |
889 | * we have cached. |
890 | */ |
891 | int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh) |
892 | { |
893 | struct nfs_fattr *fattr; |
894 | int error; |
895 | |
896 | fattr = nfs_alloc_fattr(); |
897 | if (fattr == NULL) |
898 | return -ENOMEM; |
899 | |
900 | /* Sanity: the probe won't work if the destination server |
901 | * does not recognize the migrated FH. */ |
902 | error = nfs_probe_fsinfo(server, mntfh, fattr); |
903 | |
904 | nfs_free_fattr(fattr); |
905 | return error; |
906 | } |
907 | EXPORT_SYMBOL_GPL(nfs_probe_server); |
908 | |
909 | /* |
910 | * Copy useful information when duplicating a server record |
911 | */ |
912 | void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) |
913 | { |
914 | target->flags = source->flags; |
915 | target->rsize = source->rsize; |
916 | target->wsize = source->wsize; |
917 | target->acregmin = source->acregmin; |
918 | target->acregmax = source->acregmax; |
919 | target->acdirmin = source->acdirmin; |
920 | target->acdirmax = source->acdirmax; |
921 | target->caps = source->caps; |
922 | target->options = source->options; |
923 | target->auth_info = source->auth_info; |
924 | target->port = source->port; |
925 | } |
926 | EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); |
927 | |
928 | void nfs_server_insert_lists(struct nfs_server *server) |
929 | { |
930 | struct nfs_client *clp = server->nfs_client; |
931 | struct nfs_net *nn = net_generic(net: clp->cl_net, id: nfs_net_id); |
932 | |
933 | spin_lock(lock: &nn->nfs_client_lock); |
934 | list_add_tail_rcu(new: &server->client_link, head: &clp->cl_superblocks); |
935 | list_add_tail(new: &server->master_link, head: &nn->nfs_volume_list); |
936 | clear_bit(NFS_CS_STOP_RENEW, addr: &clp->cl_res_state); |
937 | spin_unlock(lock: &nn->nfs_client_lock); |
938 | |
939 | } |
940 | EXPORT_SYMBOL_GPL(nfs_server_insert_lists); |
941 | |
942 | void nfs_server_remove_lists(struct nfs_server *server) |
943 | { |
944 | struct nfs_client *clp = server->nfs_client; |
945 | struct nfs_net *nn; |
946 | |
947 | if (clp == NULL) |
948 | return; |
949 | nn = net_generic(net: clp->cl_net, id: nfs_net_id); |
950 | spin_lock(lock: &nn->nfs_client_lock); |
951 | list_del_rcu(entry: &server->client_link); |
952 | if (list_empty(head: &clp->cl_superblocks)) |
953 | set_bit(NFS_CS_STOP_RENEW, addr: &clp->cl_res_state); |
954 | list_del(entry: &server->master_link); |
955 | spin_unlock(lock: &nn->nfs_client_lock); |
956 | |
957 | synchronize_rcu(); |
958 | } |
959 | EXPORT_SYMBOL_GPL(nfs_server_remove_lists); |
960 | |
961 | static DEFINE_IDA(s_sysfs_ids); |
962 | |
963 | /* |
964 | * Allocate and initialise a server record |
965 | */ |
966 | struct nfs_server *nfs_alloc_server(void) |
967 | { |
968 | struct nfs_server *server; |
969 | |
970 | server = kzalloc(size: sizeof(struct nfs_server), GFP_KERNEL); |
971 | if (!server) |
972 | return NULL; |
973 | |
974 | server->s_sysfs_id = ida_alloc(ida: &s_sysfs_ids, GFP_KERNEL); |
975 | if (server->s_sysfs_id < 0) { |
976 | kfree(objp: server); |
977 | return NULL; |
978 | } |
979 | |
980 | server->client = server->client_acl = ERR_PTR(error: -EINVAL); |
981 | |
982 | /* Zero out the NFS state stuff */ |
983 | INIT_LIST_HEAD(list: &server->client_link); |
984 | INIT_LIST_HEAD(list: &server->master_link); |
985 | INIT_LIST_HEAD(list: &server->delegations); |
986 | INIT_LIST_HEAD(list: &server->layouts); |
987 | INIT_LIST_HEAD(list: &server->state_owners_lru); |
988 | INIT_LIST_HEAD(list: &server->ss_copies); |
989 | |
990 | atomic_set(v: &server->active, i: 0); |
991 | |
992 | server->io_stats = nfs_alloc_iostats(); |
993 | if (!server->io_stats) { |
994 | kfree(objp: server); |
995 | return NULL; |
996 | } |
997 | |
998 | server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; |
999 | |
1000 | ida_init(ida: &server->openowner_id); |
1001 | ida_init(ida: &server->lockowner_id); |
1002 | pnfs_init_server(server); |
1003 | rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC" ); |
1004 | |
1005 | return server; |
1006 | } |
1007 | EXPORT_SYMBOL_GPL(nfs_alloc_server); |
1008 | |
1009 | /* |
1010 | * Free up a server record |
1011 | */ |
1012 | void nfs_free_server(struct nfs_server *server) |
1013 | { |
1014 | nfs_server_remove_lists(server); |
1015 | |
1016 | if (server->destroy != NULL) |
1017 | server->destroy(server); |
1018 | |
1019 | if (!IS_ERR(ptr: server->client_acl)) |
1020 | rpc_shutdown_client(server->client_acl); |
1021 | if (!IS_ERR(ptr: server->client)) |
1022 | rpc_shutdown_client(server->client); |
1023 | |
1024 | nfs_put_client(server->nfs_client); |
1025 | |
1026 | if (server->kobj.state_initialized) { |
1027 | nfs_sysfs_remove_server(s: server); |
1028 | kobject_put(kobj: &server->kobj); |
1029 | } |
1030 | ida_free(&s_sysfs_ids, id: server->s_sysfs_id); |
1031 | |
1032 | ida_destroy(ida: &server->lockowner_id); |
1033 | ida_destroy(ida: &server->openowner_id); |
1034 | nfs_free_iostats(stats: server->io_stats); |
1035 | put_cred(cred: server->cred); |
1036 | kfree(objp: server); |
1037 | nfs_release_automount_timer(); |
1038 | } |
1039 | EXPORT_SYMBOL_GPL(nfs_free_server); |
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(struct fs_context *fc) |
1046 | { |
1047 | struct nfs_fs_context *ctx = nfs_fc2context(fc); |
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(error: -ENOMEM); |
1055 | |
1056 | server->cred = get_cred(cred: fc->cred); |
1057 | |
1058 | error = -ENOMEM; |
1059 | fattr = nfs_alloc_fattr(); |
1060 | if (fattr == NULL) |
1061 | goto error; |
1062 | |
1063 | /* Get a client representation */ |
1064 | error = nfs_init_server(server, fc); |
1065 | if (error < 0) |
1066 | goto error; |
1067 | |
1068 | /* Probe the root fh to retrieve its FSID */ |
1069 | error = nfs_probe_fsinfo(server, mntfh: ctx->mntfh, fattr); |
1070 | if (error < 0) |
1071 | goto error; |
1072 | if (server->nfs_client->rpc_ops->version == 3) { |
1073 | if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) |
1074 | server->namelen = NFS3_MAXNAMLEN; |
1075 | if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) |
1076 | server->caps |= NFS_CAP_READDIRPLUS; |
1077 | } else { |
1078 | if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) |
1079 | server->namelen = NFS2_MAXNAMLEN; |
1080 | } |
1081 | |
1082 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1083 | error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, |
1084 | fattr, NULL); |
1085 | if (error < 0) { |
1086 | dprintk("nfs_create_server: getattr error = %d\n" , -error); |
1087 | goto error; |
1088 | } |
1089 | } |
1090 | memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); |
1091 | |
1092 | dprintk("Server FSID: %llx:%llx\n" , |
1093 | (unsigned long long) server->fsid.major, |
1094 | (unsigned long long) server->fsid.minor); |
1095 | |
1096 | nfs_server_insert_lists(server); |
1097 | server->mount_time = jiffies; |
1098 | nfs_free_fattr(fattr); |
1099 | return server; |
1100 | |
1101 | error: |
1102 | nfs_free_fattr(fattr); |
1103 | nfs_free_server(server); |
1104 | return ERR_PTR(error); |
1105 | } |
1106 | EXPORT_SYMBOL_GPL(nfs_create_server); |
1107 | |
1108 | /* |
1109 | * Clone an NFS2, NFS3 or NFS4 server record |
1110 | */ |
1111 | struct nfs_server *nfs_clone_server(struct nfs_server *source, |
1112 | struct nfs_fh *fh, |
1113 | struct nfs_fattr *fattr, |
1114 | rpc_authflavor_t flavor) |
1115 | { |
1116 | struct nfs_server *server; |
1117 | int error; |
1118 | |
1119 | server = nfs_alloc_server(); |
1120 | if (!server) |
1121 | return ERR_PTR(error: -ENOMEM); |
1122 | |
1123 | server->cred = get_cred(cred: source->cred); |
1124 | |
1125 | /* Copy data from the source */ |
1126 | server->nfs_client = source->nfs_client; |
1127 | server->destroy = source->destroy; |
1128 | refcount_inc(r: &server->nfs_client->cl_count); |
1129 | nfs_server_copy_userdata(server, source); |
1130 | |
1131 | server->fsid = fattr->fsid; |
1132 | |
1133 | nfs_sysfs_add_server(s: server); |
1134 | |
1135 | nfs_sysfs_link_rpc_client(server, |
1136 | clnt: server->nfs_client->cl_rpcclient, sysfs_prefix: "_state" ); |
1137 | |
1138 | error = nfs_init_server_rpcclient(server, |
1139 | source->client->cl_timeout, |
1140 | flavor); |
1141 | if (error < 0) |
1142 | goto out_free_server; |
1143 | |
1144 | /* probe the filesystem info for this server filesystem */ |
1145 | error = nfs_probe_server(server, fh); |
1146 | if (error < 0) |
1147 | goto out_free_server; |
1148 | |
1149 | if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) |
1150 | server->namelen = NFS4_MAXNAMLEN; |
1151 | |
1152 | error = nfs_start_lockd(server); |
1153 | if (error < 0) |
1154 | goto out_free_server; |
1155 | |
1156 | nfs_server_insert_lists(server); |
1157 | server->mount_time = jiffies; |
1158 | |
1159 | return server; |
1160 | |
1161 | out_free_server: |
1162 | nfs_free_server(server); |
1163 | return ERR_PTR(error); |
1164 | } |
1165 | EXPORT_SYMBOL_GPL(nfs_clone_server); |
1166 | |
1167 | void nfs_clients_init(struct net *net) |
1168 | { |
1169 | struct nfs_net *nn = net_generic(net, id: nfs_net_id); |
1170 | |
1171 | INIT_LIST_HEAD(list: &nn->nfs_client_list); |
1172 | INIT_LIST_HEAD(list: &nn->nfs_volume_list); |
1173 | #if IS_ENABLED(CONFIG_NFS_V4) |
1174 | idr_init(idr: &nn->cb_ident_idr); |
1175 | #endif |
1176 | spin_lock_init(&nn->nfs_client_lock); |
1177 | nn->boot_time = ktime_get_real(); |
1178 | |
1179 | nfs_netns_sysfs_setup(netns: nn, net); |
1180 | } |
1181 | |
1182 | void nfs_clients_exit(struct net *net) |
1183 | { |
1184 | struct nfs_net *nn = net_generic(net, id: nfs_net_id); |
1185 | |
1186 | nfs_netns_sysfs_destroy(netns: nn); |
1187 | nfs_cleanup_cb_ident_idr(net); |
1188 | WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); |
1189 | WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); |
1190 | } |
1191 | |
1192 | #ifdef CONFIG_PROC_FS |
1193 | static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); |
1194 | static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); |
1195 | static void nfs_server_list_stop(struct seq_file *p, void *v); |
1196 | static int nfs_server_list_show(struct seq_file *m, void *v); |
1197 | |
1198 | static const struct seq_operations nfs_server_list_ops = { |
1199 | .start = nfs_server_list_start, |
1200 | .next = nfs_server_list_next, |
1201 | .stop = nfs_server_list_stop, |
1202 | .show = nfs_server_list_show, |
1203 | }; |
1204 | |
1205 | static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); |
1206 | static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); |
1207 | static void nfs_volume_list_stop(struct seq_file *p, void *v); |
1208 | static int nfs_volume_list_show(struct seq_file *m, void *v); |
1209 | |
1210 | static const struct seq_operations nfs_volume_list_ops = { |
1211 | .start = nfs_volume_list_start, |
1212 | .next = nfs_volume_list_next, |
1213 | .stop = nfs_volume_list_stop, |
1214 | .show = nfs_volume_list_show, |
1215 | }; |
1216 | |
1217 | /* |
1218 | * set up the iterator to start reading from the server list and return the first item |
1219 | */ |
1220 | static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) |
1221 | __acquires(&nn->nfs_client_lock) |
1222 | { |
1223 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: m), id: nfs_net_id); |
1224 | |
1225 | /* lock the list against modification */ |
1226 | spin_lock(lock: &nn->nfs_client_lock); |
1227 | return seq_list_start_head(head: &nn->nfs_client_list, pos: *_pos); |
1228 | } |
1229 | |
1230 | /* |
1231 | * move to next server |
1232 | */ |
1233 | static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) |
1234 | { |
1235 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: p), id: nfs_net_id); |
1236 | |
1237 | return seq_list_next(v, head: &nn->nfs_client_list, ppos: pos); |
1238 | } |
1239 | |
1240 | /* |
1241 | * clean up after reading from the transports list |
1242 | */ |
1243 | static void nfs_server_list_stop(struct seq_file *p, void *v) |
1244 | __releases(&nn->nfs_client_lock) |
1245 | { |
1246 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: p), id: nfs_net_id); |
1247 | |
1248 | spin_unlock(lock: &nn->nfs_client_lock); |
1249 | } |
1250 | |
1251 | /* |
1252 | * display a header line followed by a load of call lines |
1253 | */ |
1254 | static int nfs_server_list_show(struct seq_file *m, void *v) |
1255 | { |
1256 | struct nfs_client *clp; |
1257 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: m), id: nfs_net_id); |
1258 | |
1259 | /* display header on line 1 */ |
1260 | if (v == &nn->nfs_client_list) { |
1261 | seq_puts(m, s: "NV SERVER PORT USE HOSTNAME\n" ); |
1262 | return 0; |
1263 | } |
1264 | |
1265 | /* display one transport per line on subsequent lines */ |
1266 | clp = list_entry(v, struct nfs_client, cl_share_link); |
1267 | |
1268 | /* Check if the client is initialized */ |
1269 | if (clp->cl_cons_state != NFS_CS_READY) |
1270 | return 0; |
1271 | |
1272 | rcu_read_lock(); |
1273 | seq_printf(m, fmt: "v%u %s %s %3d %s\n" , |
1274 | clp->rpc_ops->version, |
1275 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), |
1276 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), |
1277 | refcount_read(r: &clp->cl_count), |
1278 | clp->cl_hostname); |
1279 | rcu_read_unlock(); |
1280 | |
1281 | return 0; |
1282 | } |
1283 | |
1284 | /* |
1285 | * set up the iterator to start reading from the volume list and return the first item |
1286 | */ |
1287 | static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) |
1288 | __acquires(&nn->nfs_client_lock) |
1289 | { |
1290 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: m), id: nfs_net_id); |
1291 | |
1292 | /* lock the list against modification */ |
1293 | spin_lock(lock: &nn->nfs_client_lock); |
1294 | return seq_list_start_head(head: &nn->nfs_volume_list, pos: *_pos); |
1295 | } |
1296 | |
1297 | /* |
1298 | * move to next volume |
1299 | */ |
1300 | static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) |
1301 | { |
1302 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: p), id: nfs_net_id); |
1303 | |
1304 | return seq_list_next(v, head: &nn->nfs_volume_list, ppos: pos); |
1305 | } |
1306 | |
1307 | /* |
1308 | * clean up after reading from the transports list |
1309 | */ |
1310 | static void nfs_volume_list_stop(struct seq_file *p, void *v) |
1311 | __releases(&nn->nfs_client_lock) |
1312 | { |
1313 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: p), id: nfs_net_id); |
1314 | |
1315 | spin_unlock(lock: &nn->nfs_client_lock); |
1316 | } |
1317 | |
1318 | /* |
1319 | * display a header line followed by a load of call lines |
1320 | */ |
1321 | static int nfs_volume_list_show(struct seq_file *m, void *v) |
1322 | { |
1323 | struct nfs_server *server; |
1324 | struct nfs_client *clp; |
1325 | char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' |
1326 | char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' |
1327 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: m), id: nfs_net_id); |
1328 | |
1329 | /* display header on line 1 */ |
1330 | if (v == &nn->nfs_volume_list) { |
1331 | seq_puts(m, s: "NV SERVER PORT DEV FSID" |
1332 | " FSC\n" ); |
1333 | return 0; |
1334 | } |
1335 | /* display one transport per line on subsequent lines */ |
1336 | server = list_entry(v, struct nfs_server, master_link); |
1337 | clp = server->nfs_client; |
1338 | |
1339 | snprintf(buf: dev, size: sizeof(dev), fmt: "%u:%u" , |
1340 | MAJOR(server->s_dev), MINOR(server->s_dev)); |
1341 | |
1342 | snprintf(buf: fsid, size: sizeof(fsid), fmt: "%llx:%llx" , |
1343 | (unsigned long long) server->fsid.major, |
1344 | (unsigned long long) server->fsid.minor); |
1345 | |
1346 | rcu_read_lock(); |
1347 | seq_printf(m, fmt: "v%u %s %s %-12s %-33s %s\n" , |
1348 | clp->rpc_ops->version, |
1349 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), |
1350 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), |
1351 | dev, |
1352 | fsid, |
1353 | nfs_server_fscache_state(server)); |
1354 | rcu_read_unlock(); |
1355 | |
1356 | return 0; |
1357 | } |
1358 | |
1359 | int nfs_fs_proc_net_init(struct net *net) |
1360 | { |
1361 | struct nfs_net *nn = net_generic(net, id: nfs_net_id); |
1362 | struct proc_dir_entry *p; |
1363 | |
1364 | nn->proc_nfsfs = proc_net_mkdir(net, name: "nfsfs" , parent: net->proc_net); |
1365 | if (!nn->proc_nfsfs) |
1366 | goto error_0; |
1367 | |
1368 | /* a file of servers with which we're dealing */ |
1369 | p = proc_create_net("servers" , S_IFREG|S_IRUGO, nn->proc_nfsfs, |
1370 | &nfs_server_list_ops, sizeof(struct seq_net_private)); |
1371 | if (!p) |
1372 | goto error_1; |
1373 | |
1374 | /* a file of volumes that we have mounted */ |
1375 | p = proc_create_net("volumes" , S_IFREG|S_IRUGO, nn->proc_nfsfs, |
1376 | &nfs_volume_list_ops, sizeof(struct seq_net_private)); |
1377 | if (!p) |
1378 | goto error_1; |
1379 | return 0; |
1380 | |
1381 | error_1: |
1382 | remove_proc_subtree("nfsfs" , net->proc_net); |
1383 | error_0: |
1384 | return -ENOMEM; |
1385 | } |
1386 | |
1387 | void nfs_fs_proc_net_exit(struct net *net) |
1388 | { |
1389 | remove_proc_subtree("nfsfs" , net->proc_net); |
1390 | } |
1391 | |
1392 | /* |
1393 | * initialise the /proc/fs/nfsfs/ directory |
1394 | */ |
1395 | int __init nfs_fs_proc_init(void) |
1396 | { |
1397 | if (!proc_mkdir("fs/nfsfs" , NULL)) |
1398 | goto error_0; |
1399 | |
1400 | /* a file of servers with which we're dealing */ |
1401 | if (!proc_symlink("fs/nfsfs/servers" , NULL, "../../net/nfsfs/servers" )) |
1402 | goto error_1; |
1403 | |
1404 | /* a file of volumes that we have mounted */ |
1405 | if (!proc_symlink("fs/nfsfs/volumes" , NULL, "../../net/nfsfs/volumes" )) |
1406 | goto error_1; |
1407 | |
1408 | return 0; |
1409 | error_1: |
1410 | remove_proc_subtree("fs/nfsfs" , NULL); |
1411 | error_0: |
1412 | return -ENOMEM; |
1413 | } |
1414 | |
1415 | /* |
1416 | * clean up the /proc/fs/nfsfs/ directory |
1417 | */ |
1418 | void nfs_fs_proc_exit(void) |
1419 | { |
1420 | remove_proc_subtree("fs/nfsfs" , NULL); |
1421 | ida_destroy(ida: &s_sysfs_ids); |
1422 | } |
1423 | |
1424 | #endif /* CONFIG_PROC_FS */ |
1425 | |