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 | .pipe_dir_name = NFS_PIPE_DIRNAME, |
77 | }; |
78 | |
79 | static struct nfs_subversion *find_nfs_version(unsigned int version) |
80 | { |
81 | struct nfs_subversion *nfs; |
82 | spin_lock(lock: &nfs_version_lock); |
83 | |
84 | list_for_each_entry(nfs, &nfs_versions, list) { |
85 | if (nfs->rpc_ops->version == version) { |
86 | spin_unlock(lock: &nfs_version_lock); |
87 | return nfs; |
88 | } |
89 | } |
90 | |
91 | spin_unlock(lock: &nfs_version_lock); |
92 | return ERR_PTR(error: -EPROTONOSUPPORT); |
93 | } |
94 | |
95 | struct nfs_subversion *get_nfs_version(unsigned int version) |
96 | { |
97 | struct nfs_subversion *nfs = find_nfs_version(version); |
98 | |
99 | if (IS_ERR(ptr: nfs)) { |
100 | mutex_lock(&nfs_version_mutex); |
101 | request_module("nfsv%d" , version); |
102 | nfs = find_nfs_version(version); |
103 | mutex_unlock(lock: &nfs_version_mutex); |
104 | } |
105 | |
106 | if (!IS_ERR(ptr: nfs) && !try_module_get(module: nfs->owner)) |
107 | return ERR_PTR(error: -EAGAIN); |
108 | return nfs; |
109 | } |
110 | |
111 | void put_nfs_version(struct nfs_subversion *nfs) |
112 | { |
113 | module_put(module: nfs->owner); |
114 | } |
115 | |
116 | void register_nfs_version(struct nfs_subversion *nfs) |
117 | { |
118 | spin_lock(lock: &nfs_version_lock); |
119 | |
120 | list_add(new: &nfs->list, head: &nfs_versions); |
121 | nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; |
122 | |
123 | spin_unlock(lock: &nfs_version_lock); |
124 | } |
125 | EXPORT_SYMBOL_GPL(register_nfs_version); |
126 | |
127 | void unregister_nfs_version(struct nfs_subversion *nfs) |
128 | { |
129 | spin_lock(lock: &nfs_version_lock); |
130 | |
131 | nfs_version[nfs->rpc_ops->version] = NULL; |
132 | list_del(entry: &nfs->list); |
133 | |
134 | spin_unlock(lock: &nfs_version_lock); |
135 | } |
136 | EXPORT_SYMBOL_GPL(unregister_nfs_version); |
137 | |
138 | /* |
139 | * Allocate a shared client record |
140 | * |
141 | * Since these are allocated/deallocated very rarely, we don't |
142 | * bother putting them in a slab cache... |
143 | */ |
144 | struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) |
145 | { |
146 | struct nfs_client *clp; |
147 | int err = -ENOMEM; |
148 | |
149 | if ((clp = kzalloc(size: sizeof(*clp), GFP_KERNEL)) == NULL) |
150 | goto error_0; |
151 | |
152 | clp->cl_minorversion = cl_init->minorversion; |
153 | clp->cl_nfs_mod = cl_init->nfs_mod; |
154 | if (!try_module_get(module: clp->cl_nfs_mod->owner)) |
155 | goto error_dealloc; |
156 | |
157 | clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; |
158 | |
159 | refcount_set(r: &clp->cl_count, n: 1); |
160 | clp->cl_cons_state = NFS_CS_INITING; |
161 | |
162 | memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); |
163 | clp->cl_addrlen = cl_init->addrlen; |
164 | |
165 | if (cl_init->hostname) { |
166 | err = -ENOMEM; |
167 | clp->cl_hostname = kstrdup(s: cl_init->hostname, GFP_KERNEL); |
168 | if (!clp->cl_hostname) |
169 | goto error_cleanup; |
170 | } |
171 | |
172 | INIT_LIST_HEAD(list: &clp->cl_superblocks); |
173 | clp->cl_rpcclient = ERR_PTR(error: -EINVAL); |
174 | |
175 | clp->cl_flags = cl_init->init_flags; |
176 | clp->cl_proto = cl_init->proto; |
177 | clp->cl_nconnect = cl_init->nconnect; |
178 | clp->cl_max_connect = cl_init->max_connect ? cl_init->max_connect : 1; |
179 | clp->cl_net = get_net(net: cl_init->net); |
180 | |
181 | clp->cl_principal = "*" ; |
182 | clp->cl_xprtsec = cl_init->xprtsec; |
183 | return clp; |
184 | |
185 | error_cleanup: |
186 | put_nfs_version(nfs: clp->cl_nfs_mod); |
187 | error_dealloc: |
188 | kfree(objp: clp); |
189 | error_0: |
190 | return ERR_PTR(error: err); |
191 | } |
192 | EXPORT_SYMBOL_GPL(nfs_alloc_client); |
193 | |
194 | #if IS_ENABLED(CONFIG_NFS_V4) |
195 | static void nfs_cleanup_cb_ident_idr(struct net *net) |
196 | { |
197 | struct nfs_net *nn = net_generic(net, id: nfs_net_id); |
198 | |
199 | idr_destroy(&nn->cb_ident_idr); |
200 | } |
201 | |
202 | /* nfs_client_lock held */ |
203 | static void nfs_cb_idr_remove_locked(struct nfs_client *clp) |
204 | { |
205 | struct nfs_net *nn = net_generic(net: clp->cl_net, id: nfs_net_id); |
206 | |
207 | if (clp->cl_cb_ident) |
208 | idr_remove(&nn->cb_ident_idr, id: clp->cl_cb_ident); |
209 | } |
210 | |
211 | static void pnfs_init_server(struct nfs_server *server) |
212 | { |
213 | rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC" ); |
214 | } |
215 | |
216 | #else |
217 | static void nfs_cleanup_cb_ident_idr(struct net *net) |
218 | { |
219 | } |
220 | |
221 | static void nfs_cb_idr_remove_locked(struct nfs_client *clp) |
222 | { |
223 | } |
224 | |
225 | static void pnfs_init_server(struct nfs_server *server) |
226 | { |
227 | } |
228 | |
229 | #endif /* CONFIG_NFS_V4 */ |
230 | |
231 | /* |
232 | * Destroy a shared client record |
233 | */ |
234 | void nfs_free_client(struct nfs_client *clp) |
235 | { |
236 | /* -EIO all pending I/O */ |
237 | if (!IS_ERR(ptr: clp->cl_rpcclient)) |
238 | rpc_shutdown_client(clp->cl_rpcclient); |
239 | |
240 | put_net(net: clp->cl_net); |
241 | put_nfs_version(nfs: clp->cl_nfs_mod); |
242 | kfree(objp: clp->cl_hostname); |
243 | kfree(objp: clp->cl_acceptor); |
244 | kfree_rcu(clp, rcu); |
245 | } |
246 | EXPORT_SYMBOL_GPL(nfs_free_client); |
247 | |
248 | /* |
249 | * Release a reference to a shared client record |
250 | */ |
251 | void nfs_put_client(struct nfs_client *clp) |
252 | { |
253 | struct nfs_net *nn; |
254 | |
255 | if (!clp) |
256 | return; |
257 | |
258 | nn = net_generic(net: clp->cl_net, id: nfs_net_id); |
259 | |
260 | if (refcount_dec_and_lock(r: &clp->cl_count, lock: &nn->nfs_client_lock)) { |
261 | list_del(entry: &clp->cl_share_link); |
262 | nfs_cb_idr_remove_locked(clp); |
263 | spin_unlock(lock: &nn->nfs_client_lock); |
264 | |
265 | WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); |
266 | |
267 | clp->rpc_ops->free_client(clp); |
268 | } |
269 | } |
270 | EXPORT_SYMBOL_GPL(nfs_put_client); |
271 | |
272 | /* |
273 | * Find an nfs_client on the list that matches the initialisation data |
274 | * that is supplied. |
275 | */ |
276 | static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) |
277 | { |
278 | struct nfs_client *clp; |
279 | const struct sockaddr *sap = (struct sockaddr *)data->addr; |
280 | struct nfs_net *nn = net_generic(net: data->net, id: nfs_net_id); |
281 | int error; |
282 | |
283 | again: |
284 | list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { |
285 | const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; |
286 | /* Don't match clients that failed to initialise properly */ |
287 | if (clp->cl_cons_state < 0) |
288 | continue; |
289 | |
290 | /* If a client is still initializing then we need to wait */ |
291 | if (clp->cl_cons_state > NFS_CS_READY) { |
292 | refcount_inc(r: &clp->cl_count); |
293 | spin_unlock(lock: &nn->nfs_client_lock); |
294 | error = nfs_wait_client_init_complete(clp); |
295 | nfs_put_client(clp); |
296 | spin_lock(lock: &nn->nfs_client_lock); |
297 | if (error < 0) |
298 | return ERR_PTR(error); |
299 | goto again; |
300 | } |
301 | |
302 | /* Different NFS versions cannot share the same nfs_client */ |
303 | if (clp->rpc_ops != data->nfs_mod->rpc_ops) |
304 | continue; |
305 | |
306 | if (clp->cl_proto != data->proto) |
307 | continue; |
308 | /* Match nfsv4 minorversion */ |
309 | if (clp->cl_minorversion != data->minorversion) |
310 | continue; |
311 | |
312 | /* Match request for a dedicated DS */ |
313 | if (test_bit(NFS_CS_DS, &data->init_flags) != |
314 | test_bit(NFS_CS_DS, &clp->cl_flags)) |
315 | continue; |
316 | |
317 | /* Match the full socket address */ |
318 | if (!rpc_cmp_addr_port(sap1: sap, sap2: clap)) |
319 | /* Match all xprt_switch full socket addresses */ |
320 | if (IS_ERR(ptr: clp->cl_rpcclient) || |
321 | !rpc_clnt_xprt_switch_has_addr(clnt: clp->cl_rpcclient, |
322 | sap)) |
323 | continue; |
324 | |
325 | /* Match the xprt security policy */ |
326 | if (clp->cl_xprtsec.policy != data->xprtsec.policy) |
327 | continue; |
328 | |
329 | refcount_inc(r: &clp->cl_count); |
330 | return clp; |
331 | } |
332 | return NULL; |
333 | } |
334 | |
335 | /* |
336 | * Return true if @clp is done initializing, false if still working on it. |
337 | * |
338 | * Use nfs_client_init_status to check if it was successful. |
339 | */ |
340 | bool nfs_client_init_is_complete(const struct nfs_client *clp) |
341 | { |
342 | return clp->cl_cons_state <= NFS_CS_READY; |
343 | } |
344 | EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); |
345 | |
346 | /* |
347 | * Return 0 if @clp was successfully initialized, -errno otherwise. |
348 | * |
349 | * This must be called *after* nfs_client_init_is_complete() returns true, |
350 | * otherwise it will pop WARN_ON_ONCE and return -EINVAL |
351 | */ |
352 | int nfs_client_init_status(const struct nfs_client *clp) |
353 | { |
354 | /* called without checking nfs_client_init_is_complete */ |
355 | if (clp->cl_cons_state > NFS_CS_READY) { |
356 | WARN_ON_ONCE(1); |
357 | return -EINVAL; |
358 | } |
359 | return clp->cl_cons_state; |
360 | } |
361 | EXPORT_SYMBOL_GPL(nfs_client_init_status); |
362 | |
363 | int nfs_wait_client_init_complete(const struct nfs_client *clp) |
364 | { |
365 | return wait_event_killable(nfs_client_active_wq, |
366 | nfs_client_init_is_complete(clp)); |
367 | } |
368 | EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); |
369 | |
370 | /* |
371 | * Found an existing client. Make sure it's ready before returning. |
372 | */ |
373 | static struct nfs_client * |
374 | nfs_found_client(const struct nfs_client_initdata *cl_init, |
375 | struct nfs_client *clp) |
376 | { |
377 | int error; |
378 | |
379 | error = nfs_wait_client_init_complete(clp); |
380 | if (error < 0) { |
381 | nfs_put_client(clp); |
382 | return ERR_PTR(error: -ERESTARTSYS); |
383 | } |
384 | |
385 | if (clp->cl_cons_state < NFS_CS_READY) { |
386 | error = clp->cl_cons_state; |
387 | nfs_put_client(clp); |
388 | return ERR_PTR(error); |
389 | } |
390 | |
391 | smp_rmb(); |
392 | return clp; |
393 | } |
394 | |
395 | /* |
396 | * Look up a client by IP address and protocol version |
397 | * - creates a new record if one doesn't yet exist |
398 | */ |
399 | struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) |
400 | { |
401 | struct nfs_client *clp, *new = NULL; |
402 | struct nfs_net *nn = net_generic(net: cl_init->net, id: nfs_net_id); |
403 | const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; |
404 | |
405 | if (cl_init->hostname == NULL) { |
406 | WARN_ON(1); |
407 | return ERR_PTR(error: -EINVAL); |
408 | } |
409 | |
410 | /* see if the client already exists */ |
411 | do { |
412 | spin_lock(lock: &nn->nfs_client_lock); |
413 | |
414 | clp = nfs_match_client(data: cl_init); |
415 | if (clp) { |
416 | spin_unlock(lock: &nn->nfs_client_lock); |
417 | if (new) |
418 | new->rpc_ops->free_client(new); |
419 | if (IS_ERR(ptr: clp)) |
420 | return clp; |
421 | return nfs_found_client(cl_init, clp); |
422 | } |
423 | if (new) { |
424 | list_add_tail(new: &new->cl_share_link, |
425 | head: &nn->nfs_client_list); |
426 | spin_unlock(lock: &nn->nfs_client_lock); |
427 | return rpc_ops->init_client(new, cl_init); |
428 | } |
429 | |
430 | spin_unlock(lock: &nn->nfs_client_lock); |
431 | |
432 | new = rpc_ops->alloc_client(cl_init); |
433 | } while (!IS_ERR(ptr: new)); |
434 | |
435 | return new; |
436 | } |
437 | EXPORT_SYMBOL_GPL(nfs_get_client); |
438 | |
439 | /* |
440 | * Mark a server as ready or failed |
441 | */ |
442 | void nfs_mark_client_ready(struct nfs_client *clp, int state) |
443 | { |
444 | smp_wmb(); |
445 | clp->cl_cons_state = state; |
446 | wake_up_all(&nfs_client_active_wq); |
447 | } |
448 | EXPORT_SYMBOL_GPL(nfs_mark_client_ready); |
449 | |
450 | /* |
451 | * Initialise the timeout values for a connection |
452 | */ |
453 | void nfs_init_timeout_values(struct rpc_timeout *to, int proto, |
454 | int timeo, int retrans) |
455 | { |
456 | to->to_initval = timeo * HZ / 10; |
457 | to->to_retries = retrans; |
458 | |
459 | switch (proto) { |
460 | case XPRT_TRANSPORT_TCP: |
461 | case XPRT_TRANSPORT_TCP_TLS: |
462 | case XPRT_TRANSPORT_RDMA: |
463 | if (retrans == NFS_UNSPEC_RETRANS) |
464 | to->to_retries = NFS_DEF_TCP_RETRANS; |
465 | if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) |
466 | to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; |
467 | if (to->to_initval > NFS_MAX_TCP_TIMEOUT) |
468 | to->to_initval = NFS_MAX_TCP_TIMEOUT; |
469 | to->to_increment = to->to_initval; |
470 | to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); |
471 | if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) |
472 | to->to_maxval = NFS_MAX_TCP_TIMEOUT; |
473 | if (to->to_maxval < to->to_initval) |
474 | to->to_maxval = to->to_initval; |
475 | to->to_exponential = 0; |
476 | break; |
477 | case XPRT_TRANSPORT_UDP: |
478 | if (retrans == NFS_UNSPEC_RETRANS) |
479 | to->to_retries = NFS_DEF_UDP_RETRANS; |
480 | if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) |
481 | to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; |
482 | if (to->to_initval > NFS_MAX_UDP_TIMEOUT) |
483 | to->to_initval = NFS_MAX_UDP_TIMEOUT; |
484 | to->to_maxval = NFS_MAX_UDP_TIMEOUT; |
485 | to->to_exponential = 1; |
486 | break; |
487 | default: |
488 | BUG(); |
489 | } |
490 | } |
491 | EXPORT_SYMBOL_GPL(nfs_init_timeout_values); |
492 | |
493 | /* |
494 | * Create an RPC client handle |
495 | */ |
496 | int nfs_create_rpc_client(struct nfs_client *clp, |
497 | const struct nfs_client_initdata *cl_init, |
498 | rpc_authflavor_t flavor) |
499 | { |
500 | struct nfs_net *nn = net_generic(net: clp->cl_net, id: nfs_net_id); |
501 | struct rpc_clnt *clnt = NULL; |
502 | struct rpc_create_args args = { |
503 | .net = clp->cl_net, |
504 | .protocol = clp->cl_proto, |
505 | .nconnect = clp->cl_nconnect, |
506 | .address = (struct sockaddr *)&clp->cl_addr, |
507 | .addrsize = clp->cl_addrlen, |
508 | .timeout = cl_init->timeparms, |
509 | .servername = clp->cl_hostname, |
510 | .nodename = cl_init->nodename, |
511 | .program = &nfs_program, |
512 | .stats = &nn->rpcstats, |
513 | .version = clp->rpc_ops->version, |
514 | .authflavor = flavor, |
515 | .cred = cl_init->cred, |
516 | .xprtsec = cl_init->xprtsec, |
517 | .connect_timeout = cl_init->connect_timeout, |
518 | .reconnect_timeout = cl_init->reconnect_timeout, |
519 | }; |
520 | |
521 | if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) |
522 | args.flags |= RPC_CLNT_CREATE_DISCRTRY; |
523 | if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) |
524 | args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; |
525 | if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) |
526 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; |
527 | if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) |
528 | args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; |
529 | if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) |
530 | args.flags |= RPC_CLNT_CREATE_NOPING; |
531 | if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) |
532 | args.flags |= RPC_CLNT_CREATE_REUSEPORT; |
533 | |
534 | if (!IS_ERR(ptr: clp->cl_rpcclient)) |
535 | return 0; |
536 | |
537 | clnt = rpc_create(args: &args); |
538 | if (IS_ERR(ptr: clnt)) { |
539 | dprintk("%s: cannot create RPC client. Error = %ld\n" , |
540 | __func__, PTR_ERR(clnt)); |
541 | return PTR_ERR(ptr: clnt); |
542 | } |
543 | |
544 | clnt->cl_principal = clp->cl_principal; |
545 | clp->cl_rpcclient = clnt; |
546 | clnt->cl_max_connect = clp->cl_max_connect; |
547 | return 0; |
548 | } |
549 | EXPORT_SYMBOL_GPL(nfs_create_rpc_client); |
550 | |
551 | /* |
552 | * Version 2 or 3 client destruction |
553 | */ |
554 | static void nfs_destroy_server(struct nfs_server *server) |
555 | { |
556 | if (server->nlm_host) |
557 | nlmclnt_done(host: server->nlm_host); |
558 | } |
559 | |
560 | /* |
561 | * Version 2 or 3 lockd setup |
562 | */ |
563 | static int nfs_start_lockd(struct nfs_server *server) |
564 | { |
565 | struct nlm_host *host; |
566 | struct nfs_client *clp = server->nfs_client; |
567 | struct nlmclnt_initdata nlm_init = { |
568 | .hostname = clp->cl_hostname, |
569 | .address = (struct sockaddr *)&clp->cl_addr, |
570 | .addrlen = clp->cl_addrlen, |
571 | .nfs_version = clp->rpc_ops->version, |
572 | .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? |
573 | 1 : 0, |
574 | .net = clp->cl_net, |
575 | .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, |
576 | .cred = server->cred, |
577 | }; |
578 | |
579 | if (nlm_init.nfs_version > 3) |
580 | return 0; |
581 | if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && |
582 | (server->flags & NFS_MOUNT_LOCAL_FCNTL)) |
583 | return 0; |
584 | |
585 | switch (clp->cl_proto) { |
586 | default: |
587 | nlm_init.protocol = IPPROTO_TCP; |
588 | break; |
589 | #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT |
590 | case XPRT_TRANSPORT_UDP: |
591 | nlm_init.protocol = IPPROTO_UDP; |
592 | #endif |
593 | } |
594 | |
595 | host = nlmclnt_init(nlm_init: &nlm_init); |
596 | if (IS_ERR(ptr: host)) |
597 | return PTR_ERR(ptr: host); |
598 | |
599 | server->nlm_host = host; |
600 | server->destroy = nfs_destroy_server; |
601 | nfs_sysfs_link_rpc_client(server, clnt: nlmclnt_rpc_clnt(host), NULL); |
602 | return 0; |
603 | } |
604 | |
605 | /* |
606 | * Create a general RPC client |
607 | */ |
608 | int nfs_init_server_rpcclient(struct nfs_server *server, |
609 | const struct rpc_timeout *timeo, |
610 | rpc_authflavor_t pseudoflavour) |
611 | { |
612 | struct nfs_client *clp = server->nfs_client; |
613 | |
614 | server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, |
615 | pseudoflavour); |
616 | if (IS_ERR(ptr: server->client)) { |
617 | dprintk("%s: couldn't create rpc_client!\n" , __func__); |
618 | return PTR_ERR(ptr: server->client); |
619 | } |
620 | |
621 | memcpy(&server->client->cl_timeout_default, |
622 | timeo, |
623 | sizeof(server->client->cl_timeout_default)); |
624 | server->client->cl_timeout = &server->client->cl_timeout_default; |
625 | server->client->cl_softrtry = 0; |
626 | if (server->flags & NFS_MOUNT_SOFTERR) |
627 | server->client->cl_softerr = 1; |
628 | if (server->flags & NFS_MOUNT_SOFT) |
629 | server->client->cl_softrtry = 1; |
630 | |
631 | nfs_sysfs_link_rpc_client(server, clnt: server->client, NULL); |
632 | return 0; |
633 | } |
634 | EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); |
635 | |
636 | /** |
637 | * nfs_init_client - Initialise an NFS2 or NFS3 client |
638 | * |
639 | * @clp: nfs_client to initialise |
640 | * @cl_init: Initialisation parameters |
641 | * |
642 | * Returns pointer to an NFS client, or an ERR_PTR value. |
643 | */ |
644 | struct nfs_client *nfs_init_client(struct nfs_client *clp, |
645 | const struct nfs_client_initdata *cl_init) |
646 | { |
647 | int error; |
648 | |
649 | /* the client is already initialised */ |
650 | if (clp->cl_cons_state == NFS_CS_READY) |
651 | return clp; |
652 | |
653 | /* |
654 | * Create a client RPC handle for doing FSSTAT with UNIX auth only |
655 | * - RFC 2623, sec 2.3.2 |
656 | */ |
657 | error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); |
658 | nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); |
659 | if (error < 0) { |
660 | nfs_put_client(clp); |
661 | clp = ERR_PTR(error); |
662 | } |
663 | return clp; |
664 | } |
665 | EXPORT_SYMBOL_GPL(nfs_init_client); |
666 | |
667 | /* |
668 | * Create a version 2 or 3 client |
669 | */ |
670 | static int nfs_init_server(struct nfs_server *server, |
671 | const struct fs_context *fc) |
672 | { |
673 | const struct nfs_fs_context *ctx = nfs_fc2context(fc); |
674 | struct rpc_timeout timeparms; |
675 | struct nfs_client_initdata cl_init = { |
676 | .hostname = ctx->nfs_server.hostname, |
677 | .addr = &ctx->nfs_server._address, |
678 | .addrlen = ctx->nfs_server.addrlen, |
679 | .nfs_mod = ctx->nfs_mod, |
680 | .proto = ctx->nfs_server.protocol, |
681 | .net = fc->net_ns, |
682 | .timeparms = &timeparms, |
683 | .cred = server->cred, |
684 | .nconnect = ctx->nfs_server.nconnect, |
685 | .init_flags = (1UL << NFS_CS_REUSEPORT), |
686 | .xprtsec = ctx->xprtsec, |
687 | }; |
688 | struct nfs_client *clp; |
689 | int error; |
690 | |
691 | nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, |
692 | ctx->timeo, ctx->retrans); |
693 | if (ctx->flags & NFS_MOUNT_NORESVPORT) |
694 | set_bit(NFS_CS_NORESVPORT, addr: &cl_init.init_flags); |
695 | |
696 | /* Allocate or find a client reference we can use */ |
697 | clp = nfs_get_client(&cl_init); |
698 | if (IS_ERR(ptr: clp)) |
699 | return PTR_ERR(ptr: clp); |
700 | |
701 | server->nfs_client = clp; |
702 | nfs_sysfs_add_server(s: server); |
703 | nfs_sysfs_link_rpc_client(server, clnt: clp->cl_rpcclient, sysfs_prefix: "_state" ); |
704 | |
705 | /* Initialise the client representation from the mount data */ |
706 | server->flags = ctx->flags; |
707 | server->options = ctx->options; |
708 | server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; |
709 | |
710 | switch (clp->rpc_ops->version) { |
711 | case 2: |
712 | server->fattr_valid = NFS_ATTR_FATTR_V2; |
713 | break; |
714 | case 3: |
715 | server->fattr_valid = NFS_ATTR_FATTR_V3; |
716 | break; |
717 | default: |
718 | server->fattr_valid = NFS_ATTR_FATTR_V4; |
719 | } |
720 | |
721 | if (ctx->rsize) |
722 | server->rsize = nfs_io_size(iosize: ctx->rsize, proto: clp->cl_proto); |
723 | if (ctx->wsize) |
724 | server->wsize = nfs_io_size(iosize: ctx->wsize, proto: clp->cl_proto); |
725 | |
726 | server->acregmin = ctx->acregmin * HZ; |
727 | server->acregmax = ctx->acregmax * HZ; |
728 | server->acdirmin = ctx->acdirmin * HZ; |
729 | server->acdirmax = ctx->acdirmax * HZ; |
730 | |
731 | /* Start lockd here, before we might error out */ |
732 | error = nfs_start_lockd(server); |
733 | if (error < 0) |
734 | goto error; |
735 | |
736 | server->port = ctx->nfs_server.port; |
737 | server->auth_info = ctx->auth_info; |
738 | |
739 | error = nfs_init_server_rpcclient(server, &timeparms, |
740 | ctx->selected_flavor); |
741 | if (error < 0) |
742 | goto error; |
743 | |
744 | /* Preserve the values of mount_server-related mount options */ |
745 | if (ctx->mount_server.addrlen) { |
746 | memcpy(&server->mountd_address, &ctx->mount_server.address, |
747 | ctx->mount_server.addrlen); |
748 | server->mountd_addrlen = ctx->mount_server.addrlen; |
749 | } |
750 | server->mountd_version = ctx->mount_server.version; |
751 | server->mountd_port = ctx->mount_server.port; |
752 | server->mountd_protocol = ctx->mount_server.protocol; |
753 | |
754 | server->namelen = ctx->namlen; |
755 | return 0; |
756 | |
757 | error: |
758 | server->nfs_client = NULL; |
759 | nfs_put_client(clp); |
760 | return error; |
761 | } |
762 | |
763 | /* |
764 | * Load up the server record from information gained in an fsinfo record |
765 | */ |
766 | static void nfs_server_set_fsinfo(struct nfs_server *server, |
767 | struct nfs_fsinfo *fsinfo) |
768 | { |
769 | struct nfs_client *clp = server->nfs_client; |
770 | unsigned long max_rpc_payload, raw_max_rpc_payload; |
771 | |
772 | /* Work out a lot of parameters */ |
773 | if (server->rsize == 0) |
774 | server->rsize = nfs_io_size(iosize: fsinfo->rtpref, proto: clp->cl_proto); |
775 | if (server->wsize == 0) |
776 | server->wsize = nfs_io_size(iosize: fsinfo->wtpref, proto: clp->cl_proto); |
777 | |
778 | if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) |
779 | server->rsize = nfs_io_size(iosize: fsinfo->rtmax, proto: clp->cl_proto); |
780 | if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) |
781 | server->wsize = nfs_io_size(iosize: fsinfo->wtmax, proto: clp->cl_proto); |
782 | |
783 | raw_max_rpc_payload = rpc_max_payload(server->client); |
784 | max_rpc_payload = nfs_block_size(bsize: raw_max_rpc_payload, NULL); |
785 | |
786 | if (server->rsize > max_rpc_payload) |
787 | server->rsize = max_rpc_payload; |
788 | if (server->rsize > NFS_MAX_FILE_IO_SIZE) |
789 | server->rsize = NFS_MAX_FILE_IO_SIZE; |
790 | server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; |
791 | |
792 | if (server->wsize > max_rpc_payload) |
793 | server->wsize = max_rpc_payload; |
794 | if (server->wsize > NFS_MAX_FILE_IO_SIZE) |
795 | server->wsize = NFS_MAX_FILE_IO_SIZE; |
796 | server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; |
797 | |
798 | server->wtmult = nfs_block_bits(bsize: fsinfo->wtmult, NULL); |
799 | |
800 | server->dtsize = nfs_block_size(bsize: fsinfo->dtpref, NULL); |
801 | if (server->dtsize > NFS_MAX_FILE_IO_SIZE) |
802 | server->dtsize = NFS_MAX_FILE_IO_SIZE; |
803 | if (server->dtsize > server->rsize) |
804 | server->dtsize = server->rsize; |
805 | |
806 | if (server->flags & NFS_MOUNT_NOAC) { |
807 | server->acregmin = server->acregmax = 0; |
808 | server->acdirmin = server->acdirmax = 0; |
809 | } |
810 | |
811 | server->maxfilesize = fsinfo->maxfilesize; |
812 | |
813 | server->time_delta = fsinfo->time_delta; |
814 | server->change_attr_type = fsinfo->change_attr_type; |
815 | |
816 | server->clone_blksize = fsinfo->clone_blksize; |
817 | /* We're airborne Set socket buffersize */ |
818 | rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); |
819 | |
820 | #ifdef CONFIG_NFS_V4_2 |
821 | /* |
822 | * Defaults until limited by the session parameters. |
823 | */ |
824 | server->gxasize = min_t(unsigned int, raw_max_rpc_payload, |
825 | XATTR_SIZE_MAX); |
826 | server->sxasize = min_t(unsigned int, raw_max_rpc_payload, |
827 | XATTR_SIZE_MAX); |
828 | server->lxasize = min_t(unsigned int, raw_max_rpc_payload, |
829 | nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); |
830 | |
831 | if (fsinfo->xattr_support) |
832 | server->caps |= NFS_CAP_XATTR; |
833 | #endif |
834 | } |
835 | |
836 | /* |
837 | * Probe filesystem information, including the FSID on v2/v3 |
838 | */ |
839 | static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) |
840 | { |
841 | struct nfs_fsinfo fsinfo; |
842 | struct nfs_client *clp = server->nfs_client; |
843 | int error; |
844 | |
845 | if (clp->rpc_ops->set_capabilities != NULL) { |
846 | error = clp->rpc_ops->set_capabilities(server, mntfh); |
847 | if (error < 0) |
848 | return error; |
849 | } |
850 | |
851 | fsinfo.fattr = fattr; |
852 | fsinfo.nlayouttypes = 0; |
853 | memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); |
854 | error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); |
855 | if (error < 0) |
856 | return error; |
857 | |
858 | nfs_server_set_fsinfo(server, fsinfo: &fsinfo); |
859 | |
860 | /* Get some general file system info */ |
861 | if (server->namelen == 0) { |
862 | struct nfs_pathconf pathinfo; |
863 | |
864 | pathinfo.fattr = fattr; |
865 | nfs_fattr_init(fattr); |
866 | |
867 | if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) |
868 | server->namelen = pathinfo.max_namelen; |
869 | } |
870 | |
871 | if (clp->rpc_ops->discover_trunking != NULL && |
872 | (server->caps & NFS_CAP_FS_LOCATIONS && |
873 | (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) { |
874 | error = clp->rpc_ops->discover_trunking(server, mntfh); |
875 | if (error < 0) |
876 | return error; |
877 | } |
878 | |
879 | return 0; |
880 | } |
881 | |
882 | /* |
883 | * Grab the destination's particulars, including lease expiry time. |
884 | * |
885 | * Returns zero if probe succeeded and retrieved FSID matches the FSID |
886 | * we have cached. |
887 | */ |
888 | int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh) |
889 | { |
890 | struct nfs_fattr *fattr; |
891 | int error; |
892 | |
893 | fattr = nfs_alloc_fattr(); |
894 | if (fattr == NULL) |
895 | return -ENOMEM; |
896 | |
897 | /* Sanity: the probe won't work if the destination server |
898 | * does not recognize the migrated FH. */ |
899 | error = nfs_probe_fsinfo(server, mntfh, fattr); |
900 | |
901 | nfs_free_fattr(fattr); |
902 | return error; |
903 | } |
904 | EXPORT_SYMBOL_GPL(nfs_probe_server); |
905 | |
906 | /* |
907 | * Copy useful information when duplicating a server record |
908 | */ |
909 | void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) |
910 | { |
911 | target->flags = source->flags; |
912 | target->rsize = source->rsize; |
913 | target->wsize = source->wsize; |
914 | target->acregmin = source->acregmin; |
915 | target->acregmax = source->acregmax; |
916 | target->acdirmin = source->acdirmin; |
917 | target->acdirmax = source->acdirmax; |
918 | target->caps = source->caps; |
919 | target->options = source->options; |
920 | target->auth_info = source->auth_info; |
921 | target->port = source->port; |
922 | } |
923 | EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); |
924 | |
925 | void nfs_server_insert_lists(struct nfs_server *server) |
926 | { |
927 | struct nfs_client *clp = server->nfs_client; |
928 | struct nfs_net *nn = net_generic(net: clp->cl_net, id: nfs_net_id); |
929 | |
930 | spin_lock(lock: &nn->nfs_client_lock); |
931 | list_add_tail_rcu(new: &server->client_link, head: &clp->cl_superblocks); |
932 | list_add_tail(new: &server->master_link, head: &nn->nfs_volume_list); |
933 | clear_bit(NFS_CS_STOP_RENEW, addr: &clp->cl_res_state); |
934 | spin_unlock(lock: &nn->nfs_client_lock); |
935 | |
936 | } |
937 | EXPORT_SYMBOL_GPL(nfs_server_insert_lists); |
938 | |
939 | void nfs_server_remove_lists(struct nfs_server *server) |
940 | { |
941 | struct nfs_client *clp = server->nfs_client; |
942 | struct nfs_net *nn; |
943 | |
944 | if (clp == NULL) |
945 | return; |
946 | nn = net_generic(net: clp->cl_net, id: nfs_net_id); |
947 | spin_lock(lock: &nn->nfs_client_lock); |
948 | list_del_rcu(entry: &server->client_link); |
949 | if (list_empty(head: &clp->cl_superblocks)) |
950 | set_bit(NFS_CS_STOP_RENEW, addr: &clp->cl_res_state); |
951 | list_del(entry: &server->master_link); |
952 | spin_unlock(lock: &nn->nfs_client_lock); |
953 | |
954 | synchronize_rcu(); |
955 | } |
956 | EXPORT_SYMBOL_GPL(nfs_server_remove_lists); |
957 | |
958 | static DEFINE_IDA(s_sysfs_ids); |
959 | |
960 | /* |
961 | * Allocate and initialise a server record |
962 | */ |
963 | struct nfs_server *nfs_alloc_server(void) |
964 | { |
965 | struct nfs_server *server; |
966 | |
967 | server = kzalloc(size: sizeof(struct nfs_server), GFP_KERNEL); |
968 | if (!server) |
969 | return NULL; |
970 | |
971 | server->s_sysfs_id = ida_alloc(ida: &s_sysfs_ids, GFP_KERNEL); |
972 | if (server->s_sysfs_id < 0) { |
973 | kfree(objp: server); |
974 | return NULL; |
975 | } |
976 | |
977 | server->client = server->client_acl = ERR_PTR(error: -EINVAL); |
978 | |
979 | /* Zero out the NFS state stuff */ |
980 | INIT_LIST_HEAD(list: &server->client_link); |
981 | INIT_LIST_HEAD(list: &server->master_link); |
982 | INIT_LIST_HEAD(list: &server->delegations); |
983 | INIT_LIST_HEAD(list: &server->layouts); |
984 | INIT_LIST_HEAD(list: &server->state_owners_lru); |
985 | INIT_LIST_HEAD(list: &server->ss_copies); |
986 | |
987 | atomic_set(v: &server->active, i: 0); |
988 | |
989 | server->io_stats = nfs_alloc_iostats(); |
990 | if (!server->io_stats) { |
991 | kfree(objp: server); |
992 | return NULL; |
993 | } |
994 | |
995 | server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; |
996 | |
997 | ida_init(ida: &server->openowner_id); |
998 | ida_init(ida: &server->lockowner_id); |
999 | pnfs_init_server(server); |
1000 | rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC" ); |
1001 | |
1002 | return server; |
1003 | } |
1004 | EXPORT_SYMBOL_GPL(nfs_alloc_server); |
1005 | |
1006 | static void delayed_free(struct rcu_head *p) |
1007 | { |
1008 | struct nfs_server *server = container_of(p, struct nfs_server, rcu); |
1009 | |
1010 | nfs_free_iostats(stats: server->io_stats); |
1011 | kfree(objp: server); |
1012 | } |
1013 | |
1014 | /* |
1015 | * Free up a server record |
1016 | */ |
1017 | void nfs_free_server(struct nfs_server *server) |
1018 | { |
1019 | nfs_server_remove_lists(server); |
1020 | |
1021 | if (server->destroy != NULL) |
1022 | server->destroy(server); |
1023 | |
1024 | if (!IS_ERR(ptr: server->client_acl)) |
1025 | rpc_shutdown_client(server->client_acl); |
1026 | if (!IS_ERR(ptr: server->client)) |
1027 | rpc_shutdown_client(server->client); |
1028 | |
1029 | nfs_put_client(server->nfs_client); |
1030 | |
1031 | if (server->kobj.state_initialized) { |
1032 | nfs_sysfs_remove_server(s: server); |
1033 | kobject_put(kobj: &server->kobj); |
1034 | } |
1035 | ida_free(&s_sysfs_ids, id: server->s_sysfs_id); |
1036 | |
1037 | ida_destroy(ida: &server->lockowner_id); |
1038 | ida_destroy(ida: &server->openowner_id); |
1039 | put_cred(cred: server->cred); |
1040 | nfs_release_automount_timer(); |
1041 | call_rcu(head: &server->rcu, func: delayed_free); |
1042 | } |
1043 | EXPORT_SYMBOL_GPL(nfs_free_server); |
1044 | |
1045 | /* |
1046 | * Create a version 2 or 3 volume record |
1047 | * - keyed on server and FSID |
1048 | */ |
1049 | struct nfs_server *nfs_create_server(struct fs_context *fc) |
1050 | { |
1051 | struct nfs_fs_context *ctx = nfs_fc2context(fc); |
1052 | struct nfs_server *server; |
1053 | struct nfs_fattr *fattr; |
1054 | int error; |
1055 | |
1056 | server = nfs_alloc_server(); |
1057 | if (!server) |
1058 | return ERR_PTR(error: -ENOMEM); |
1059 | |
1060 | server->cred = get_cred(cred: fc->cred); |
1061 | |
1062 | error = -ENOMEM; |
1063 | fattr = nfs_alloc_fattr(); |
1064 | if (fattr == NULL) |
1065 | goto error; |
1066 | |
1067 | /* Get a client representation */ |
1068 | error = nfs_init_server(server, fc); |
1069 | if (error < 0) |
1070 | goto error; |
1071 | |
1072 | /* Probe the root fh to retrieve its FSID */ |
1073 | error = nfs_probe_fsinfo(server, mntfh: ctx->mntfh, fattr); |
1074 | if (error < 0) |
1075 | goto error; |
1076 | if (server->nfs_client->rpc_ops->version == 3) { |
1077 | if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) |
1078 | server->namelen = NFS3_MAXNAMLEN; |
1079 | if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) |
1080 | server->caps |= NFS_CAP_READDIRPLUS; |
1081 | } else { |
1082 | if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) |
1083 | server->namelen = NFS2_MAXNAMLEN; |
1084 | } |
1085 | |
1086 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1087 | error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, |
1088 | fattr, NULL); |
1089 | if (error < 0) { |
1090 | dprintk("nfs_create_server: getattr error = %d\n" , -error); |
1091 | goto error; |
1092 | } |
1093 | } |
1094 | memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); |
1095 | |
1096 | dprintk("Server FSID: %llx:%llx\n" , |
1097 | (unsigned long long) server->fsid.major, |
1098 | (unsigned long long) server->fsid.minor); |
1099 | |
1100 | nfs_server_insert_lists(server); |
1101 | server->mount_time = jiffies; |
1102 | nfs_free_fattr(fattr); |
1103 | return server; |
1104 | |
1105 | error: |
1106 | nfs_free_fattr(fattr); |
1107 | nfs_free_server(server); |
1108 | return ERR_PTR(error); |
1109 | } |
1110 | EXPORT_SYMBOL_GPL(nfs_create_server); |
1111 | |
1112 | /* |
1113 | * Clone an NFS2, NFS3 or NFS4 server record |
1114 | */ |
1115 | struct nfs_server *nfs_clone_server(struct nfs_server *source, |
1116 | struct nfs_fh *fh, |
1117 | struct nfs_fattr *fattr, |
1118 | rpc_authflavor_t flavor) |
1119 | { |
1120 | struct nfs_server *server; |
1121 | int error; |
1122 | |
1123 | server = nfs_alloc_server(); |
1124 | if (!server) |
1125 | return ERR_PTR(error: -ENOMEM); |
1126 | |
1127 | server->cred = get_cred(cred: source->cred); |
1128 | |
1129 | /* Copy data from the source */ |
1130 | server->nfs_client = source->nfs_client; |
1131 | server->destroy = source->destroy; |
1132 | refcount_inc(r: &server->nfs_client->cl_count); |
1133 | nfs_server_copy_userdata(server, source); |
1134 | |
1135 | server->fsid = fattr->fsid; |
1136 | |
1137 | nfs_sysfs_add_server(s: server); |
1138 | |
1139 | nfs_sysfs_link_rpc_client(server, |
1140 | clnt: server->nfs_client->cl_rpcclient, sysfs_prefix: "_state" ); |
1141 | |
1142 | error = nfs_init_server_rpcclient(server, |
1143 | source->client->cl_timeout, |
1144 | flavor); |
1145 | if (error < 0) |
1146 | goto out_free_server; |
1147 | |
1148 | /* probe the filesystem info for this server filesystem */ |
1149 | error = nfs_probe_server(server, fh); |
1150 | if (error < 0) |
1151 | goto out_free_server; |
1152 | |
1153 | if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) |
1154 | server->namelen = NFS4_MAXNAMLEN; |
1155 | |
1156 | error = nfs_start_lockd(server); |
1157 | if (error < 0) |
1158 | goto out_free_server; |
1159 | |
1160 | nfs_server_insert_lists(server); |
1161 | server->mount_time = jiffies; |
1162 | |
1163 | return server; |
1164 | |
1165 | out_free_server: |
1166 | nfs_free_server(server); |
1167 | return ERR_PTR(error); |
1168 | } |
1169 | EXPORT_SYMBOL_GPL(nfs_clone_server); |
1170 | |
1171 | void nfs_clients_init(struct net *net) |
1172 | { |
1173 | struct nfs_net *nn = net_generic(net, id: nfs_net_id); |
1174 | |
1175 | INIT_LIST_HEAD(list: &nn->nfs_client_list); |
1176 | INIT_LIST_HEAD(list: &nn->nfs_volume_list); |
1177 | #if IS_ENABLED(CONFIG_NFS_V4) |
1178 | idr_init(idr: &nn->cb_ident_idr); |
1179 | #endif |
1180 | spin_lock_init(&nn->nfs_client_lock); |
1181 | nn->boot_time = ktime_get_real(); |
1182 | memset(&nn->rpcstats, 0, sizeof(nn->rpcstats)); |
1183 | nn->rpcstats.program = &nfs_program; |
1184 | |
1185 | nfs_netns_sysfs_setup(netns: nn, net); |
1186 | } |
1187 | |
1188 | void nfs_clients_exit(struct net *net) |
1189 | { |
1190 | struct nfs_net *nn = net_generic(net, id: nfs_net_id); |
1191 | |
1192 | nfs_netns_sysfs_destroy(netns: nn); |
1193 | nfs_cleanup_cb_ident_idr(net); |
1194 | WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); |
1195 | WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); |
1196 | } |
1197 | |
1198 | #ifdef CONFIG_PROC_FS |
1199 | static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); |
1200 | static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); |
1201 | static void nfs_server_list_stop(struct seq_file *p, void *v); |
1202 | static int nfs_server_list_show(struct seq_file *m, void *v); |
1203 | |
1204 | static const struct seq_operations nfs_server_list_ops = { |
1205 | .start = nfs_server_list_start, |
1206 | .next = nfs_server_list_next, |
1207 | .stop = nfs_server_list_stop, |
1208 | .show = nfs_server_list_show, |
1209 | }; |
1210 | |
1211 | static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); |
1212 | static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); |
1213 | static void nfs_volume_list_stop(struct seq_file *p, void *v); |
1214 | static int nfs_volume_list_show(struct seq_file *m, void *v); |
1215 | |
1216 | static const struct seq_operations nfs_volume_list_ops = { |
1217 | .start = nfs_volume_list_start, |
1218 | .next = nfs_volume_list_next, |
1219 | .stop = nfs_volume_list_stop, |
1220 | .show = nfs_volume_list_show, |
1221 | }; |
1222 | |
1223 | /* |
1224 | * set up the iterator to start reading from the server list and return the first item |
1225 | */ |
1226 | static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) |
1227 | __acquires(&nn->nfs_client_lock) |
1228 | { |
1229 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: m), id: nfs_net_id); |
1230 | |
1231 | /* lock the list against modification */ |
1232 | spin_lock(lock: &nn->nfs_client_lock); |
1233 | return seq_list_start_head(head: &nn->nfs_client_list, pos: *_pos); |
1234 | } |
1235 | |
1236 | /* |
1237 | * move to next server |
1238 | */ |
1239 | static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) |
1240 | { |
1241 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: p), id: nfs_net_id); |
1242 | |
1243 | return seq_list_next(v, head: &nn->nfs_client_list, ppos: pos); |
1244 | } |
1245 | |
1246 | /* |
1247 | * clean up after reading from the transports list |
1248 | */ |
1249 | static void nfs_server_list_stop(struct seq_file *p, void *v) |
1250 | __releases(&nn->nfs_client_lock) |
1251 | { |
1252 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: p), id: nfs_net_id); |
1253 | |
1254 | spin_unlock(lock: &nn->nfs_client_lock); |
1255 | } |
1256 | |
1257 | /* |
1258 | * display a header line followed by a load of call lines |
1259 | */ |
1260 | static int nfs_server_list_show(struct seq_file *m, void *v) |
1261 | { |
1262 | struct nfs_client *clp; |
1263 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: m), id: nfs_net_id); |
1264 | |
1265 | /* display header on line 1 */ |
1266 | if (v == &nn->nfs_client_list) { |
1267 | seq_puts(m, s: "NV SERVER PORT USE HOSTNAME\n" ); |
1268 | return 0; |
1269 | } |
1270 | |
1271 | /* display one transport per line on subsequent lines */ |
1272 | clp = list_entry(v, struct nfs_client, cl_share_link); |
1273 | |
1274 | /* Check if the client is initialized */ |
1275 | if (clp->cl_cons_state != NFS_CS_READY) |
1276 | return 0; |
1277 | |
1278 | rcu_read_lock(); |
1279 | seq_printf(m, fmt: "v%u %s %s %3d %s\n" , |
1280 | clp->rpc_ops->version, |
1281 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), |
1282 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), |
1283 | refcount_read(r: &clp->cl_count), |
1284 | clp->cl_hostname); |
1285 | rcu_read_unlock(); |
1286 | |
1287 | return 0; |
1288 | } |
1289 | |
1290 | /* |
1291 | * set up the iterator to start reading from the volume list and return the first item |
1292 | */ |
1293 | static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) |
1294 | __acquires(&nn->nfs_client_lock) |
1295 | { |
1296 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: m), id: nfs_net_id); |
1297 | |
1298 | /* lock the list against modification */ |
1299 | spin_lock(lock: &nn->nfs_client_lock); |
1300 | return seq_list_start_head(head: &nn->nfs_volume_list, pos: *_pos); |
1301 | } |
1302 | |
1303 | /* |
1304 | * move to next volume |
1305 | */ |
1306 | static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) |
1307 | { |
1308 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: p), id: nfs_net_id); |
1309 | |
1310 | return seq_list_next(v, head: &nn->nfs_volume_list, ppos: pos); |
1311 | } |
1312 | |
1313 | /* |
1314 | * clean up after reading from the transports list |
1315 | */ |
1316 | static void nfs_volume_list_stop(struct seq_file *p, void *v) |
1317 | __releases(&nn->nfs_client_lock) |
1318 | { |
1319 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: p), id: nfs_net_id); |
1320 | |
1321 | spin_unlock(lock: &nn->nfs_client_lock); |
1322 | } |
1323 | |
1324 | /* |
1325 | * display a header line followed by a load of call lines |
1326 | */ |
1327 | static int nfs_volume_list_show(struct seq_file *m, void *v) |
1328 | { |
1329 | struct nfs_server *server; |
1330 | struct nfs_client *clp; |
1331 | char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' |
1332 | char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' |
1333 | struct nfs_net *nn = net_generic(net: seq_file_net(seq: m), id: nfs_net_id); |
1334 | |
1335 | /* display header on line 1 */ |
1336 | if (v == &nn->nfs_volume_list) { |
1337 | seq_puts(m, s: "NV SERVER PORT DEV FSID" |
1338 | " FSC\n" ); |
1339 | return 0; |
1340 | } |
1341 | /* display one transport per line on subsequent lines */ |
1342 | server = list_entry(v, struct nfs_server, master_link); |
1343 | clp = server->nfs_client; |
1344 | |
1345 | snprintf(buf: dev, size: sizeof(dev), fmt: "%u:%u" , |
1346 | MAJOR(server->s_dev), MINOR(server->s_dev)); |
1347 | |
1348 | snprintf(buf: fsid, size: sizeof(fsid), fmt: "%llx:%llx" , |
1349 | (unsigned long long) server->fsid.major, |
1350 | (unsigned long long) server->fsid.minor); |
1351 | |
1352 | rcu_read_lock(); |
1353 | seq_printf(m, fmt: "v%u %s %s %-12s %-33s %s\n" , |
1354 | clp->rpc_ops->version, |
1355 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), |
1356 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), |
1357 | dev, |
1358 | fsid, |
1359 | nfs_server_fscache_state(server)); |
1360 | rcu_read_unlock(); |
1361 | |
1362 | return 0; |
1363 | } |
1364 | |
1365 | int nfs_fs_proc_net_init(struct net *net) |
1366 | { |
1367 | struct nfs_net *nn = net_generic(net, id: nfs_net_id); |
1368 | struct proc_dir_entry *p; |
1369 | |
1370 | nn->proc_nfsfs = proc_net_mkdir(net, name: "nfsfs" , parent: net->proc_net); |
1371 | if (!nn->proc_nfsfs) |
1372 | goto error_0; |
1373 | |
1374 | /* a file of servers with which we're dealing */ |
1375 | p = proc_create_net("servers" , S_IFREG|S_IRUGO, nn->proc_nfsfs, |
1376 | &nfs_server_list_ops, sizeof(struct seq_net_private)); |
1377 | if (!p) |
1378 | goto error_1; |
1379 | |
1380 | /* a file of volumes that we have mounted */ |
1381 | p = proc_create_net("volumes" , S_IFREG|S_IRUGO, nn->proc_nfsfs, |
1382 | &nfs_volume_list_ops, sizeof(struct seq_net_private)); |
1383 | if (!p) |
1384 | goto error_1; |
1385 | return 0; |
1386 | |
1387 | error_1: |
1388 | remove_proc_subtree("nfsfs" , net->proc_net); |
1389 | error_0: |
1390 | return -ENOMEM; |
1391 | } |
1392 | |
1393 | void nfs_fs_proc_net_exit(struct net *net) |
1394 | { |
1395 | remove_proc_subtree("nfsfs" , net->proc_net); |
1396 | } |
1397 | |
1398 | /* |
1399 | * initialise the /proc/fs/nfsfs/ directory |
1400 | */ |
1401 | int __init nfs_fs_proc_init(void) |
1402 | { |
1403 | if (!proc_mkdir("fs/nfsfs" , NULL)) |
1404 | goto error_0; |
1405 | |
1406 | /* a file of servers with which we're dealing */ |
1407 | if (!proc_symlink("fs/nfsfs/servers" , NULL, "../../net/nfsfs/servers" )) |
1408 | goto error_1; |
1409 | |
1410 | /* a file of volumes that we have mounted */ |
1411 | if (!proc_symlink("fs/nfsfs/volumes" , NULL, "../../net/nfsfs/volumes" )) |
1412 | goto error_1; |
1413 | |
1414 | return 0; |
1415 | error_1: |
1416 | remove_proc_subtree("fs/nfsfs" , NULL); |
1417 | error_0: |
1418 | return -ENOMEM; |
1419 | } |
1420 | |
1421 | /* |
1422 | * clean up the /proc/fs/nfsfs/ directory |
1423 | */ |
1424 | void nfs_fs_proc_exit(void) |
1425 | { |
1426 | remove_proc_subtree("fs/nfsfs" , NULL); |
1427 | ida_destroy(ida: &s_sysfs_ids); |
1428 | } |
1429 | |
1430 | #endif /* CONFIG_PROC_FS */ |
1431 | |