Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
24c8dbbb DH |
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) | |
24c8dbbb DH |
6 | */ |
7 | ||
8 | ||
24c8dbbb DH |
9 | #include <linux/module.h> |
10 | #include <linux/init.h> | |
e8edc6e0 | 11 | #include <linux/sched.h> |
24c8dbbb DH |
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> | |
d8efa4e6 | 19 | #include <linux/sunrpc/addr.h> |
24c8dbbb DH |
20 | #include <linux/sunrpc/clnt.h> |
21 | #include <linux/sunrpc/stats.h> | |
22 | #include <linux/sunrpc/metrics.h> | |
0896a725 | 23 | #include <linux/sunrpc/xprtsock.h> |
2cf7ff7a | 24 | #include <linux/sunrpc/xprtrdma.h> |
24c8dbbb DH |
25 | #include <linux/nfs_fs.h> |
26 | #include <linux/nfs_mount.h> | |
27 | #include <linux/nfs4_mount.h> | |
28 | #include <linux/lockd/bind.h> | |
24c8dbbb DH |
29 | #include <linux/seq_file.h> |
30 | #include <linux/mount.h> | |
24c8dbbb DH |
31 | #include <linux/vfs.h> |
32 | #include <linux/inet.h> | |
3b0d3f93 | 33 | #include <linux/in6.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
40401530 | 35 | #include <linux/idr.h> |
3b0d3f93 | 36 | #include <net/ipv6.h> |
24c8dbbb | 37 | #include <linux/nfs_xdr.h> |
0b5b7ae0 | 38 | #include <linux/sunrpc/bc_xprt.h> |
6b13168b SK |
39 | #include <linux/nsproxy.h> |
40 | #include <linux/pid_namespace.h> | |
24c8dbbb | 41 | |
24c8dbbb DH |
42 | |
43 | #include "nfs4_fs.h" | |
44 | #include "callback.h" | |
45 | #include "delegation.h" | |
46 | #include "iostat.h" | |
47 | #include "internal.h" | |
14727281 | 48 | #include "fscache.h" |
85e174ba | 49 | #include "pnfs.h" |
ab7017a3 | 50 | #include "nfs.h" |
6b13168b | 51 | #include "netns.h" |
bf11fbdb | 52 | #include "sysfs.h" |
04a5da69 | 53 | #include "nfs42.h" |
24c8dbbb DH |
54 | |
55 | #define NFSDBG_FACILITY NFSDBG_CLIENT | |
56 | ||
24c8dbbb | 57 | static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); |
ab7017a3 BS |
58 | static DEFINE_SPINLOCK(nfs_version_lock); |
59 | static DEFINE_MUTEX(nfs_version_mutex); | |
60 | static LIST_HEAD(nfs_versions); | |
24c8dbbb | 61 | |
5006a76c DH |
62 | /* |
63 | * RPC cruft for NFS | |
64 | */ | |
a613fa16 | 65 | static const struct rpc_version *nfs_version[5] = { |
ab7017a3 BS |
66 | [2] = NULL, |
67 | [3] = NULL, | |
68 | [4] = NULL, | |
5006a76c DH |
69 | }; |
70 | ||
a613fa16 | 71 | const struct rpc_program nfs_program = { |
5006a76c DH |
72 | .name = "nfs", |
73 | .number = NFS_PROGRAM, | |
74 | .nrvers = ARRAY_SIZE(nfs_version), | |
75 | .version = nfs_version, | |
76 | .stats = &nfs_rpcstat, | |
fe0a9b74 | 77 | .pipe_dir_name = NFS_PIPE_DIRNAME, |
5006a76c DH |
78 | }; |
79 | ||
80 | struct rpc_stat nfs_rpcstat = { | |
81 | .program = &nfs_program | |
82 | }; | |
83 | ||
ab7017a3 BS |
84 | static struct nfs_subversion *find_nfs_version(unsigned int version) |
85 | { | |
86 | struct nfs_subversion *nfs; | |
87 | spin_lock(&nfs_version_lock); | |
88 | ||
89 | list_for_each_entry(nfs, &nfs_versions, list) { | |
90 | if (nfs->rpc_ops->version == version) { | |
91 | spin_unlock(&nfs_version_lock); | |
92 | return nfs; | |
93 | } | |
ee34e136 | 94 | } |
ab7017a3 BS |
95 | |
96 | spin_unlock(&nfs_version_lock); | |
ee34e136 | 97 | return ERR_PTR(-EPROTONOSUPPORT); |
ab7017a3 BS |
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(nfs)) { | |
105 | mutex_lock(&nfs_version_mutex); | |
1ae811ee | 106 | request_module("nfsv%d", version); |
ab7017a3 BS |
107 | nfs = find_nfs_version(version); |
108 | mutex_unlock(&nfs_version_mutex); | |
109 | } | |
110 | ||
1f70ef96 AK |
111 | if (!IS_ERR(nfs) && !try_module_get(nfs->owner)) |
112 | return ERR_PTR(-EAGAIN); | |
ab7017a3 BS |
113 | return nfs; |
114 | } | |
115 | ||
116 | void put_nfs_version(struct nfs_subversion *nfs) | |
117 | { | |
118 | module_put(nfs->owner); | |
119 | } | |
120 | ||
121 | void register_nfs_version(struct nfs_subversion *nfs) | |
122 | { | |
123 | spin_lock(&nfs_version_lock); | |
124 | ||
125 | list_add(&nfs->list, &nfs_versions); | |
126 | nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; | |
127 | ||
128 | spin_unlock(&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(&nfs_version_lock); | |
135 | ||
136 | nfs_version[nfs->rpc_ops->version] = NULL; | |
137 | list_del(&nfs->list); | |
138 | ||
139 | spin_unlock(&nfs_version_lock); | |
140 | } | |
141 | EXPORT_SYMBOL_GPL(unregister_nfs_version); | |
142 | ||
24c8dbbb DH |
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 | */ | |
6663ee7f | 149 | struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) |
24c8dbbb DH |
150 | { |
151 | struct nfs_client *clp; | |
a21bdd9b | 152 | int err = -ENOMEM; |
24c8dbbb DH |
153 | |
154 | if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) | |
155 | goto error_0; | |
156 | ||
55dee1bc | 157 | clp->cl_minorversion = cl_init->minorversion; |
ab7017a3 | 158 | clp->cl_nfs_mod = cl_init->nfs_mod; |
1f70ef96 AK |
159 | if (!try_module_get(clp->cl_nfs_mod->owner)) |
160 | goto error_dealloc; | |
ab7017a3 BS |
161 | |
162 | clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; | |
40c55319 | 163 | |
212bf41d | 164 | refcount_set(&clp->cl_count, 1); |
24c8dbbb DH |
165 | clp->cl_cons_state = NFS_CS_INITING; |
166 | ||
6e4cffd7 CL |
167 | memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); |
168 | clp->cl_addrlen = cl_init->addrlen; | |
24c8dbbb | 169 | |
3a498026 | 170 | if (cl_init->hostname) { |
a21bdd9b | 171 | err = -ENOMEM; |
3a498026 | 172 | clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); |
24c8dbbb | 173 | if (!clp->cl_hostname) |
71468513 | 174 | goto error_cleanup; |
24c8dbbb DH |
175 | } |
176 | ||
177 | INIT_LIST_HEAD(&clp->cl_superblocks); | |
178 | clp->cl_rpcclient = ERR_PTR(-EINVAL); | |
179 | ||
468d126d | 180 | clp->cl_flags = cl_init->init_flags; |
59dca3b2 | 181 | clp->cl_proto = cl_init->proto; |
6619079d | 182 | clp->cl_nconnect = cl_init->nconnect; |
7e134205 | 183 | clp->cl_max_connect = cl_init->max_connect ? cl_init->max_connect : 1; |
73ea666c | 184 | clp->cl_net = get_net(cl_init->net); |
59dca3b2 | 185 | |
5e16923b | 186 | clp->cl_principal = "*"; |
24c8dbbb DH |
187 | return clp; |
188 | ||
71468513 | 189 | error_cleanup: |
ab7017a3 | 190 | put_nfs_version(clp->cl_nfs_mod); |
1f70ef96 | 191 | error_dealloc: |
24c8dbbb DH |
192 | kfree(clp); |
193 | error_0: | |
a21bdd9b | 194 | return ERR_PTR(err); |
24c8dbbb | 195 | } |
ddda8e0a | 196 | EXPORT_SYMBOL_GPL(nfs_alloc_client); |
24c8dbbb | 197 | |
89d77c8f | 198 | #if IS_ENABLED(CONFIG_NFS_V4) |
10b7a70c | 199 | static void nfs_cleanup_cb_ident_idr(struct net *net) |
f4eecd5d | 200 | { |
28cd1b3f SK |
201 | struct nfs_net *nn = net_generic(net, nfs_net_id); |
202 | ||
203 | idr_destroy(&nn->cb_ident_idr); | |
f4eecd5d AA |
204 | } |
205 | ||
206 | /* nfs_client_lock held */ | |
207 | static void nfs_cb_idr_remove_locked(struct nfs_client *clp) | |
208 | { | |
73ea666c | 209 | struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); |
28cd1b3f | 210 | |
f4eecd5d | 211 | if (clp->cl_cb_ident) |
28cd1b3f | 212 | idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); |
f4eecd5d AA |
213 | } |
214 | ||
f7e8917a FI |
215 | static void pnfs_init_server(struct nfs_server *server) |
216 | { | |
217 | rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); | |
218 | } | |
219 | ||
888ef2e3 | 220 | #else |
10b7a70c | 221 | static void nfs_cleanup_cb_ident_idr(struct net *net) |
f4eecd5d AA |
222 | { |
223 | } | |
224 | ||
225 | static void nfs_cb_idr_remove_locked(struct nfs_client *clp) | |
226 | { | |
227 | } | |
f7e8917a FI |
228 | |
229 | static void pnfs_init_server(struct nfs_server *server) | |
230 | { | |
231 | } | |
232 | ||
888ef2e3 | 233 | #endif /* CONFIG_NFS_V4 */ |
557134a3 | 234 | |
24c8dbbb DH |
235 | /* |
236 | * Destroy a shared client record | |
237 | */ | |
cdb7eced | 238 | void nfs_free_client(struct nfs_client *clp) |
24c8dbbb | 239 | { |
24c8dbbb DH |
240 | /* -EIO all pending I/O */ |
241 | if (!IS_ERR(clp->cl_rpcclient)) | |
242 | rpc_shutdown_client(clp->cl_rpcclient); | |
243 | ||
73ea666c | 244 | put_net(clp->cl_net); |
ab7017a3 | 245 | put_nfs_version(clp->cl_nfs_mod); |
24c8dbbb | 246 | kfree(clp->cl_hostname); |
f11b2a1c | 247 | kfree(clp->cl_acceptor); |
24c8dbbb | 248 | kfree(clp); |
24c8dbbb | 249 | } |
ddda8e0a | 250 | EXPORT_SYMBOL_GPL(nfs_free_client); |
24c8dbbb DH |
251 | |
252 | /* | |
253 | * Release a reference to a shared client record | |
254 | */ | |
255 | void nfs_put_client(struct nfs_client *clp) | |
256 | { | |
dc030858 SK |
257 | struct nfs_net *nn; |
258 | ||
27ba8512 DH |
259 | if (!clp) |
260 | return; | |
261 | ||
73ea666c | 262 | nn = net_generic(clp->cl_net, nfs_net_id); |
24c8dbbb | 263 | |
212bf41d | 264 | if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { |
24c8dbbb | 265 | list_del(&clp->cl_share_link); |
f4eecd5d | 266 | nfs_cb_idr_remove_locked(clp); |
dc030858 | 267 | spin_unlock(&nn->nfs_client_lock); |
24c8dbbb | 268 | |
1fea73a8 | 269 | WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); |
24c8dbbb | 270 | |
cdb7eced | 271 | clp->rpc_ops->free_client(clp); |
24c8dbbb DH |
272 | } |
273 | } | |
16b374ca | 274 | EXPORT_SYMBOL_GPL(nfs_put_client); |
24c8dbbb | 275 | |
24c8dbbb | 276 | /* |
c81468a1 TM |
277 | * Find an nfs_client on the list that matches the initialisation data |
278 | * that is supplied. | |
24c8dbbb | 279 | */ |
c81468a1 | 280 | static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) |
24c8dbbb DH |
281 | { |
282 | struct nfs_client *clp; | |
cf0d7e7f | 283 | const struct sockaddr *sap = (struct sockaddr *)data->addr; |
6b13168b | 284 | struct nfs_net *nn = net_generic(data->net, nfs_net_id); |
950a578c | 285 | int error; |
24c8dbbb | 286 | |
c156618e | 287 | again: |
6b13168b | 288 | list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { |
d7371c41 | 289 | const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; |
c81468a1 TM |
290 | /* Don't match clients that failed to initialise properly */ |
291 | if (clp->cl_cons_state < 0) | |
292 | continue; | |
293 | ||
c156618e SM |
294 | /* If a client is still initializing then we need to wait */ |
295 | if (clp->cl_cons_state > NFS_CS_READY) { | |
296 | refcount_inc(&clp->cl_count); | |
297 | spin_unlock(&nn->nfs_client_lock); | |
950a578c | 298 | error = nfs_wait_client_init_complete(clp); |
c156618e | 299 | nfs_put_client(clp); |
c260121a | 300 | spin_lock(&nn->nfs_client_lock); |
950a578c RBC |
301 | if (error < 0) |
302 | return ERR_PTR(error); | |
c156618e SM |
303 | goto again; |
304 | } | |
305 | ||
c81468a1 | 306 | /* Different NFS versions cannot share the same nfs_client */ |
ab7017a3 | 307 | if (clp->rpc_ops != data->nfs_mod->rpc_ops) |
c81468a1 TM |
308 | continue; |
309 | ||
59dca3b2 TM |
310 | if (clp->cl_proto != data->proto) |
311 | continue; | |
5aae4a9a BH |
312 | /* Match nfsv4 minorversion */ |
313 | if (clp->cl_minorversion != data->minorversion) | |
314 | continue; | |
52f98f1a TM |
315 | |
316 | /* Match request for a dedicated DS */ | |
317 | if (test_bit(NFS_CS_DS, &data->init_flags) != | |
318 | test_bit(NFS_CS_DS, &clp->cl_flags)) | |
319 | continue; | |
320 | ||
c81468a1 | 321 | /* Match the full socket address */ |
d8efa4e6 | 322 | if (!rpc_cmp_addr_port(sap, clap)) |
04ea1b3e | 323 | /* Match all xprt_switch full socket addresses */ |
8ef32955 PV |
324 | if (IS_ERR(clp->cl_rpcclient) || |
325 | !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, | |
04ea1b3e AA |
326 | sap)) |
327 | continue; | |
c81468a1 | 328 | |
212bf41d | 329 | refcount_inc(&clp->cl_count); |
c81468a1 | 330 | return clp; |
13bbc06a | 331 | } |
c81468a1 | 332 | return NULL; |
24c8dbbb DH |
333 | } |
334 | ||
a33e4b03 WAA |
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) | |
4697bd5e | 341 | { |
48d66b97 | 342 | return clp->cl_cons_state <= NFS_CS_READY; |
4697bd5e | 343 | } |
a33e4b03 WAA |
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); | |
4697bd5e TM |
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 | } | |
89d77c8f | 368 | EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); |
4697bd5e | 369 | |
f411703a CL |
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 | ||
4697bd5e | 379 | error = nfs_wait_client_init_complete(clp); |
f411703a CL |
380 | if (error < 0) { |
381 | nfs_put_client(clp); | |
382 | return ERR_PTR(-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 | ||
54ac471c | 391 | smp_rmb(); |
f411703a CL |
392 | return clp; |
393 | } | |
394 | ||
24c8dbbb DH |
395 | /* |
396 | * Look up a client by IP address and protocol version | |
397 | * - creates a new record if one doesn't yet exist | |
398 | */ | |
7d38de3f | 399 | struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) |
24c8dbbb DH |
400 | { |
401 | struct nfs_client *clp, *new = NULL; | |
6b13168b | 402 | struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); |
ab7017a3 | 403 | const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; |
24c8dbbb | 404 | |
31434f49 PT |
405 | if (cl_init->hostname == NULL) { |
406 | WARN_ON(1); | |
09226e83 | 407 | return ERR_PTR(-EINVAL); |
31434f49 PT |
408 | } |
409 | ||
24c8dbbb DH |
410 | /* see if the client already exists */ |
411 | do { | |
dc030858 | 412 | spin_lock(&nn->nfs_client_lock); |
24c8dbbb | 413 | |
c81468a1 | 414 | clp = nfs_match_client(cl_init); |
f411703a CL |
415 | if (clp) { |
416 | spin_unlock(&nn->nfs_client_lock); | |
417 | if (new) | |
cdb7eced | 418 | new->rpc_ops->free_client(new); |
9f7761cf BC |
419 | if (IS_ERR(clp)) |
420 | return clp; | |
f411703a CL |
421 | return nfs_found_client(cl_init, clp); |
422 | } | |
8cab4c39 | 423 | if (new) { |
05f4c350 CL |
424 | list_add_tail(&new->cl_share_link, |
425 | &nn->nfs_client_list); | |
8cab4c39 | 426 | spin_unlock(&nn->nfs_client_lock); |
5c6e5b60 | 427 | return rpc_ops->init_client(new, cl_init); |
8cab4c39 | 428 | } |
24c8dbbb | 429 | |
dc030858 | 430 | spin_unlock(&nn->nfs_client_lock); |
24c8dbbb | 431 | |
ab7017a3 | 432 | new = rpc_ops->alloc_client(cl_init); |
a21bdd9b | 433 | } while (!IS_ERR(new)); |
24c8dbbb | 434 | |
a21bdd9b | 435 | return new; |
24c8dbbb | 436 | } |
89d77c8f | 437 | EXPORT_SYMBOL_GPL(nfs_get_client); |
24c8dbbb DH |
438 | |
439 | /* | |
440 | * Mark a server as ready or failed | |
441 | */ | |
76db6d95 | 442 | void nfs_mark_client_ready(struct nfs_client *clp, int state) |
24c8dbbb | 443 | { |
54ac471c | 444 | smp_wmb(); |
24c8dbbb DH |
445 | clp->cl_cons_state = state; |
446 | wake_up_all(&nfs_client_active_wq); | |
447 | } | |
89d77c8f | 448 | EXPORT_SYMBOL_GPL(nfs_mark_client_ready); |
5006a76c DH |
449 | |
450 | /* | |
451 | * Initialise the timeout values for a connection | |
452 | */ | |
fcf10398 | 453 | void nfs_init_timeout_values(struct rpc_timeout *to, int proto, |
a956beda | 454 | int timeo, int retrans) |
5006a76c DH |
455 | { |
456 | to->to_initval = timeo * HZ / 10; | |
457 | to->to_retries = retrans; | |
5006a76c DH |
458 | |
459 | switch (proto) { | |
0896a725 | 460 | case XPRT_TRANSPORT_TCP: |
2cf7ff7a | 461 | case XPRT_TRANSPORT_RDMA: |
a956beda | 462 | if (retrans == NFS_UNSPEC_RETRANS) |
259875ef | 463 | to->to_retries = NFS_DEF_TCP_RETRANS; |
5a698243 | 464 | if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) |
259875ef | 465 | to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; |
5006a76c DH |
466 | if (to->to_initval > NFS_MAX_TCP_TIMEOUT) |
467 | to->to_initval = NFS_MAX_TCP_TIMEOUT; | |
468 | to->to_increment = to->to_initval; | |
469 | to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); | |
7a3e3e18 TM |
470 | if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) |
471 | to->to_maxval = NFS_MAX_TCP_TIMEOUT; | |
472 | if (to->to_maxval < to->to_initval) | |
473 | to->to_maxval = to->to_initval; | |
5006a76c DH |
474 | to->to_exponential = 0; |
475 | break; | |
0896a725 | 476 | case XPRT_TRANSPORT_UDP: |
a956beda | 477 | if (retrans == NFS_UNSPEC_RETRANS) |
259875ef | 478 | to->to_retries = NFS_DEF_UDP_RETRANS; |
a956beda | 479 | if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) |
259875ef | 480 | to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; |
5006a76c DH |
481 | if (to->to_initval > NFS_MAX_UDP_TIMEOUT) |
482 | to->to_initval = NFS_MAX_UDP_TIMEOUT; | |
483 | to->to_maxval = NFS_MAX_UDP_TIMEOUT; | |
484 | to->to_exponential = 1; | |
485 | break; | |
259875ef TM |
486 | default: |
487 | BUG(); | |
5006a76c DH |
488 | } |
489 | } | |
89d77c8f | 490 | EXPORT_SYMBOL_GPL(nfs_init_timeout_values); |
5006a76c DH |
491 | |
492 | /* | |
493 | * Create an RPC client handle | |
494 | */ | |
428360d7 | 495 | int nfs_create_rpc_client(struct nfs_client *clp, |
5c6e5b60 | 496 | const struct nfs_client_initdata *cl_init, |
428360d7 | 497 | rpc_authflavor_t flavor) |
5006a76c | 498 | { |
5006a76c | 499 | struct rpc_clnt *clnt = NULL; |
41877d20 | 500 | struct rpc_create_args args = { |
73ea666c | 501 | .net = clp->cl_net, |
59dca3b2 | 502 | .protocol = clp->cl_proto, |
6619079d | 503 | .nconnect = clp->cl_nconnect, |
41877d20 | 504 | .address = (struct sockaddr *)&clp->cl_addr, |
6e4cffd7 | 505 | .addrsize = clp->cl_addrlen, |
5c6e5b60 | 506 | .timeout = cl_init->timeparms, |
41877d20 | 507 | .servername = clp->cl_hostname, |
5c6e5b60 | 508 | .nodename = cl_init->nodename, |
41877d20 CL |
509 | .program = &nfs_program, |
510 | .version = clp->rpc_ops->version, | |
511 | .authflavor = flavor, | |
1a58e8a0 | 512 | .cred = cl_init->cred, |
41877d20 | 513 | }; |
5006a76c | 514 | |
4bf590e0 | 515 | if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) |
4a01b8a4 | 516 | args.flags |= RPC_CLNT_CREATE_DISCRTRY; |
99875249 TM |
517 | if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) |
518 | args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; | |
4bf590e0 | 519 | if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) |
4a01b8a4 | 520 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; |
98f98cf5 TM |
521 | if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) |
522 | args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; | |
4b1b69ce TM |
523 | if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) |
524 | args.flags |= RPC_CLNT_CREATE_NOPING; | |
e6237b6f TM |
525 | if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) |
526 | args.flags |= RPC_CLNT_CREATE_REUSEPORT; | |
4a01b8a4 | 527 | |
5006a76c DH |
528 | if (!IS_ERR(clp->cl_rpcclient)) |
529 | return 0; | |
530 | ||
41877d20 | 531 | clnt = rpc_create(&args); |
5006a76c DH |
532 | if (IS_ERR(clnt)) { |
533 | dprintk("%s: cannot create RPC client. Error = %ld\n", | |
3110ff80 | 534 | __func__, PTR_ERR(clnt)); |
5006a76c DH |
535 | return PTR_ERR(clnt); |
536 | } | |
537 | ||
5e16923b | 538 | clnt->cl_principal = clp->cl_principal; |
5006a76c | 539 | clp->cl_rpcclient = clnt; |
dc48e0ab | 540 | clnt->cl_max_connect = clp->cl_max_connect; |
5006a76c DH |
541 | return 0; |
542 | } | |
89d77c8f | 543 | EXPORT_SYMBOL_GPL(nfs_create_rpc_client); |
54ceac45 DH |
544 | |
545 | /* | |
546 | * Version 2 or 3 client destruction | |
547 | */ | |
548 | static void nfs_destroy_server(struct nfs_server *server) | |
549 | { | |
f259613a | 550 | if (server->nlm_host) |
9289e7f9 | 551 | nlmclnt_done(server->nlm_host); |
54ceac45 DH |
552 | } |
553 | ||
554 | /* | |
555 | * Version 2 or 3 lockd setup | |
556 | */ | |
557 | static int nfs_start_lockd(struct nfs_server *server) | |
558 | { | |
9289e7f9 CL |
559 | struct nlm_host *host; |
560 | struct nfs_client *clp = server->nfs_client; | |
883bb163 CL |
561 | struct nlmclnt_initdata nlm_init = { |
562 | .hostname = clp->cl_hostname, | |
563 | .address = (struct sockaddr *)&clp->cl_addr, | |
564 | .addrlen = clp->cl_addrlen, | |
883bb163 | 565 | .nfs_version = clp->rpc_ops->version, |
0cb2659b CL |
566 | .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? |
567 | 1 : 0, | |
73ea666c | 568 | .net = clp->cl_net, |
b1ece737 | 569 | .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, |
d18a9d3f | 570 | .cred = server->cred, |
883bb163 | 571 | }; |
54ceac45 | 572 | |
883bb163 | 573 | if (nlm_init.nfs_version > 3) |
9289e7f9 | 574 | return 0; |
5eebde23 SJ |
575 | if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && |
576 | (server->flags & NFS_MOUNT_LOCAL_FCNTL)) | |
9289e7f9 CL |
577 | return 0; |
578 | ||
8a6e5deb TM |
579 | switch (clp->cl_proto) { |
580 | default: | |
581 | nlm_init.protocol = IPPROTO_TCP; | |
582 | break; | |
b24ee6c6 | 583 | #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT |
8a6e5deb TM |
584 | case XPRT_TRANSPORT_UDP: |
585 | nlm_init.protocol = IPPROTO_UDP; | |
b24ee6c6 | 586 | #endif |
8a6e5deb TM |
587 | } |
588 | ||
883bb163 | 589 | host = nlmclnt_init(&nlm_init); |
9289e7f9 CL |
590 | if (IS_ERR(host)) |
591 | return PTR_ERR(host); | |
592 | ||
593 | server->nlm_host = host; | |
594 | server->destroy = nfs_destroy_server; | |
595 | return 0; | |
54ceac45 DH |
596 | } |
597 | ||
54ceac45 DH |
598 | /* |
599 | * Create a general RPC client | |
600 | */ | |
fcf10398 | 601 | int nfs_init_server_rpcclient(struct nfs_server *server, |
33170233 TM |
602 | const struct rpc_timeout *timeo, |
603 | rpc_authflavor_t pseudoflavour) | |
54ceac45 DH |
604 | { |
605 | struct nfs_client *clp = server->nfs_client; | |
606 | ||
ba9b584c CL |
607 | server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, |
608 | pseudoflavour); | |
54ceac45 | 609 | if (IS_ERR(server->client)) { |
3110ff80 | 610 | dprintk("%s: couldn't create rpc_client!\n", __func__); |
54ceac45 DH |
611 | return PTR_ERR(server->client); |
612 | } | |
613 | ||
33170233 TM |
614 | memcpy(&server->client->cl_timeout_default, |
615 | timeo, | |
616 | sizeof(server->client->cl_timeout_default)); | |
617 | server->client->cl_timeout = &server->client->cl_timeout_default; | |
54ceac45 | 618 | server->client->cl_softrtry = 0; |
91a575e1 TM |
619 | if (server->flags & NFS_MOUNT_SOFTERR) |
620 | server->client->cl_softerr = 1; | |
54ceac45 DH |
621 | if (server->flags & NFS_MOUNT_SOFT) |
622 | server->client->cl_softrtry = 1; | |
623 | ||
54ceac45 DH |
624 | return 0; |
625 | } | |
89d77c8f | 626 | EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); |
54ceac45 | 627 | |
8cab4c39 CL |
628 | /** |
629 | * nfs_init_client - Initialise an NFS2 or NFS3 client | |
630 | * | |
631 | * @clp: nfs_client to initialise | |
5c6e5b60 | 632 | * @cl_init: Initialisation parameters |
8cab4c39 CL |
633 | * |
634 | * Returns pointer to an NFS client, or an ERR_PTR value. | |
54ceac45 | 635 | */ |
8cab4c39 | 636 | struct nfs_client *nfs_init_client(struct nfs_client *clp, |
5c6e5b60 | 637 | const struct nfs_client_initdata *cl_init) |
54ceac45 | 638 | { |
54ceac45 DH |
639 | int error; |
640 | ||
2844b6ae AS |
641 | /* the client is already initialised */ |
642 | if (clp->cl_cons_state == NFS_CS_READY) | |
8cab4c39 | 643 | return clp; |
54ceac45 | 644 | |
54ceac45 DH |
645 | /* |
646 | * Create a client RPC handle for doing FSSTAT with UNIX auth only | |
647 | * - RFC 2623, sec 2.3.2 | |
648 | */ | |
5c6e5b60 | 649 | error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); |
2844b6ae AS |
650 | nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); |
651 | if (error < 0) { | |
652 | nfs_put_client(clp); | |
653 | clp = ERR_PTR(error); | |
654 | } | |
8cab4c39 | 655 | return clp; |
54ceac45 | 656 | } |
ddda8e0a | 657 | EXPORT_SYMBOL_GPL(nfs_init_client); |
54ceac45 DH |
658 | |
659 | /* | |
660 | * Create a version 2 or 3 client | |
661 | */ | |
2283f8d6 | 662 | static int nfs_init_server(struct nfs_server *server, |
62a55d08 | 663 | const struct fs_context *fc) |
54ceac45 | 664 | { |
62a55d08 | 665 | const struct nfs_fs_context *ctx = nfs_fc2context(fc); |
5c6e5b60 | 666 | struct rpc_timeout timeparms; |
3a498026 | 667 | struct nfs_client_initdata cl_init = { |
38465f5d | 668 | .hostname = ctx->nfs_server.hostname, |
cf0d7e7f | 669 | .addr = &ctx->nfs_server._address, |
38465f5d | 670 | .addrlen = ctx->nfs_server.addrlen, |
62a55d08 | 671 | .nfs_mod = ctx->nfs_mod, |
38465f5d | 672 | .proto = ctx->nfs_server.protocol, |
62a55d08 | 673 | .net = fc->net_ns, |
5c6e5b60 | 674 | .timeparms = &timeparms, |
1a58e8a0 | 675 | .cred = server->cred, |
38465f5d | 676 | .nconnect = ctx->nfs_server.nconnect, |
e6237b6f | 677 | .init_flags = (1UL << NFS_CS_REUSEPORT), |
3a498026 | 678 | }; |
54ceac45 | 679 | struct nfs_client *clp; |
3a498026 | 680 | int error; |
54ceac45 | 681 | |
38465f5d SM |
682 | nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, |
683 | ctx->timeo, ctx->retrans); | |
684 | if (ctx->flags & NFS_MOUNT_NORESVPORT) | |
4bf590e0 | 685 | set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); |
45a52a02 | 686 | |
54ceac45 | 687 | /* Allocate or find a client reference we can use */ |
7d38de3f | 688 | clp = nfs_get_client(&cl_init); |
4cbb9768 | 689 | if (IS_ERR(clp)) |
54ceac45 | 690 | return PTR_ERR(clp); |
54ceac45 | 691 | |
54ceac45 DH |
692 | server->nfs_client = clp; |
693 | ||
694 | /* Initialise the client representation from the mount data */ | |
38465f5d SM |
695 | server->flags = ctx->flags; |
696 | server->options = ctx->options; | |
ce62b114 TM |
697 | server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; |
698 | ||
699 | switch (clp->rpc_ops->version) { | |
700 | case 2: | |
701 | server->fattr_valid = NFS_ATTR_FATTR_V2; | |
702 | break; | |
703 | case 3: | |
704 | server->fattr_valid = NFS_ATTR_FATTR_V3; | |
705 | break; | |
706 | default: | |
707 | server->fattr_valid = NFS_ATTR_FATTR_V4; | |
708 | } | |
54ceac45 | 709 | |
38465f5d | 710 | if (ctx->rsize) |
940261a1 | 711 | server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto); |
38465f5d | 712 | if (ctx->wsize) |
940261a1 | 713 | server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto); |
54ceac45 | 714 | |
38465f5d SM |
715 | server->acregmin = ctx->acregmin * HZ; |
716 | server->acregmax = ctx->acregmax * HZ; | |
717 | server->acdirmin = ctx->acdirmin * HZ; | |
718 | server->acdirmax = ctx->acdirmax * HZ; | |
54ceac45 DH |
719 | |
720 | /* Start lockd here, before we might error out */ | |
721 | error = nfs_start_lockd(server); | |
722 | if (error < 0) | |
723 | goto error; | |
724 | ||
38465f5d SM |
725 | server->port = ctx->nfs_server.port; |
726 | server->auth_info = ctx->auth_info; | |
f22d6d79 | 727 | |
a3f73c27 | 728 | error = nfs_init_server_rpcclient(server, &timeparms, |
38465f5d | 729 | ctx->selected_flavor); |
54ceac45 DH |
730 | if (error < 0) |
731 | goto error; | |
732 | ||
3f8400d1 | 733 | /* Preserve the values of mount_server-related mount options */ |
38465f5d SM |
734 | if (ctx->mount_server.addrlen) { |
735 | memcpy(&server->mountd_address, &ctx->mount_server.address, | |
736 | ctx->mount_server.addrlen); | |
737 | server->mountd_addrlen = ctx->mount_server.addrlen; | |
3f8400d1 | 738 | } |
38465f5d SM |
739 | server->mountd_version = ctx->mount_server.version; |
740 | server->mountd_port = ctx->mount_server.port; | |
741 | server->mountd_protocol = ctx->mount_server.protocol; | |
3f8400d1 | 742 | |
38465f5d | 743 | server->namelen = ctx->namlen; |
54ceac45 DH |
744 | return 0; |
745 | ||
746 | error: | |
747 | server->nfs_client = NULL; | |
748 | nfs_put_client(clp); | |
54ceac45 DH |
749 | return error; |
750 | } | |
751 | ||
752 | /* | |
753 | * Load up the server record from information gained in an fsinfo record | |
754 | */ | |
738fd0f3 | 755 | static void nfs_server_set_fsinfo(struct nfs_server *server, |
738fd0f3 | 756 | struct nfs_fsinfo *fsinfo) |
54ceac45 | 757 | { |
940261a1 | 758 | struct nfs_client *clp = server->nfs_client; |
04a5da69 | 759 | unsigned long max_rpc_payload, raw_max_rpc_payload; |
54ceac45 DH |
760 | |
761 | /* Work out a lot of parameters */ | |
762 | if (server->rsize == 0) | |
940261a1 | 763 | server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto); |
54ceac45 | 764 | if (server->wsize == 0) |
940261a1 | 765 | server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto); |
54ceac45 DH |
766 | |
767 | if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) | |
940261a1 | 768 | server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto); |
54ceac45 | 769 | if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) |
940261a1 | 770 | server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto); |
54ceac45 | 771 | |
04a5da69 FL |
772 | raw_max_rpc_payload = rpc_max_payload(server->client); |
773 | max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL); | |
774 | ||
54ceac45 DH |
775 | if (server->rsize > max_rpc_payload) |
776 | server->rsize = max_rpc_payload; | |
777 | if (server->rsize > NFS_MAX_FILE_IO_SIZE) | |
778 | server->rsize = NFS_MAX_FILE_IO_SIZE; | |
09cbfeaf | 779 | server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; |
e0bf68dd | 780 | |
54ceac45 DH |
781 | if (server->wsize > max_rpc_payload) |
782 | server->wsize = max_rpc_payload; | |
783 | if (server->wsize > NFS_MAX_FILE_IO_SIZE) | |
784 | server->wsize = NFS_MAX_FILE_IO_SIZE; | |
09cbfeaf | 785 | server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; |
85e174ba | 786 | |
54ceac45 DH |
787 | server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); |
788 | ||
789 | server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); | |
1a34c8c9 TM |
790 | if (server->dtsize > NFS_MAX_FILE_IO_SIZE) |
791 | server->dtsize = NFS_MAX_FILE_IO_SIZE; | |
54ceac45 DH |
792 | if (server->dtsize > server->rsize) |
793 | server->dtsize = server->rsize; | |
794 | ||
795 | if (server->flags & NFS_MOUNT_NOAC) { | |
796 | server->acregmin = server->acregmax = 0; | |
797 | server->acdirmin = server->acdirmax = 0; | |
798 | } | |
799 | ||
800 | server->maxfilesize = fsinfo->maxfilesize; | |
801 | ||
6b96724e | 802 | server->time_delta = fsinfo->time_delta; |
7f08a335 | 803 | server->change_attr_type = fsinfo->change_attr_type; |
6b96724e | 804 | |
2a92ee92 | 805 | server->clone_blksize = fsinfo->clone_blksize; |
54ceac45 DH |
806 | /* We're airborne Set socket buffersize */ |
807 | rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); | |
04a5da69 FL |
808 | |
809 | #ifdef CONFIG_NFS_V4_2 | |
810 | /* | |
811 | * Defaults until limited by the session parameters. | |
812 | */ | |
813 | server->gxasize = min_t(unsigned int, raw_max_rpc_payload, | |
814 | XATTR_SIZE_MAX); | |
815 | server->sxasize = min_t(unsigned int, raw_max_rpc_payload, | |
816 | XATTR_SIZE_MAX); | |
817 | server->lxasize = min_t(unsigned int, raw_max_rpc_payload, | |
818 | nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); | |
b78ef845 FL |
819 | |
820 | if (fsinfo->xattr_support) | |
821 | server->caps |= NFS_CAP_XATTR; | |
04a5da69 | 822 | #endif |
54ceac45 DH |
823 | } |
824 | ||
825 | /* | |
826 | * Probe filesystem information, including the FSID on v2/v3 | |
827 | */ | |
5fe1210d | 828 | static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) |
54ceac45 DH |
829 | { |
830 | struct nfs_fsinfo fsinfo; | |
831 | struct nfs_client *clp = server->nfs_client; | |
832 | int error; | |
833 | ||
54ceac45 DH |
834 | if (clp->rpc_ops->set_capabilities != NULL) { |
835 | error = clp->rpc_ops->set_capabilities(server, mntfh); | |
836 | if (error < 0) | |
4cbb9768 | 837 | return error; |
54ceac45 DH |
838 | } |
839 | ||
840 | fsinfo.fattr = fattr; | |
ca440c38 | 841 | fsinfo.nlayouttypes = 0; |
3132e49e | 842 | memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); |
54ceac45 DH |
843 | error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); |
844 | if (error < 0) | |
4cbb9768 | 845 | return error; |
54ceac45 | 846 | |
71f81e51 | 847 | nfs_server_set_fsinfo(server, &fsinfo); |
54ceac45 DH |
848 | |
849 | /* Get some general file system info */ | |
850 | if (server->namelen == 0) { | |
851 | struct nfs_pathconf pathinfo; | |
852 | ||
853 | pathinfo.fattr = fattr; | |
854 | nfs_fattr_init(fattr); | |
855 | ||
856 | if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) | |
857 | server->namelen = pathinfo.max_namelen; | |
858 | } | |
859 | ||
1976b2b3 | 860 | if (clp->rpc_ops->discover_trunking != NULL && |
a43bf604 OK |
861 | (server->caps & NFS_CAP_FS_LOCATIONS && |
862 | (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) { | |
1976b2b3 OK |
863 | error = clp->rpc_ops->discover_trunking(server, mntfh); |
864 | if (error < 0) | |
865 | return error; | |
866 | } | |
867 | ||
54ceac45 | 868 | return 0; |
54ceac45 DH |
869 | } |
870 | ||
e5731131 AS |
871 | /* |
872 | * Grab the destination's particulars, including lease expiry time. | |
873 | * | |
874 | * Returns zero if probe succeeded and retrieved FSID matches the FSID | |
875 | * we have cached. | |
876 | */ | |
877 | int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh) | |
878 | { | |
879 | struct nfs_fattr *fattr; | |
880 | int error; | |
881 | ||
882 | fattr = nfs_alloc_fattr(); | |
883 | if (fattr == NULL) | |
884 | return -ENOMEM; | |
885 | ||
886 | /* Sanity: the probe won't work if the destination server | |
887 | * does not recognize the migrated FH. */ | |
888 | error = nfs_probe_fsinfo(server, mntfh, fattr); | |
889 | ||
890 | nfs_free_fattr(fattr); | |
891 | return error; | |
892 | } | |
893 | EXPORT_SYMBOL_GPL(nfs_probe_server); | |
894 | ||
54ceac45 DH |
895 | /* |
896 | * Copy useful information when duplicating a server record | |
897 | */ | |
fcf10398 | 898 | void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) |
54ceac45 DH |
899 | { |
900 | target->flags = source->flags; | |
356e76b8 CL |
901 | target->rsize = source->rsize; |
902 | target->wsize = source->wsize; | |
54ceac45 DH |
903 | target->acregmin = source->acregmin; |
904 | target->acregmax = source->acregmax; | |
905 | target->acdirmin = source->acdirmin; | |
906 | target->acdirmax = source->acdirmax; | |
907 | target->caps = source->caps; | |
2df54806 | 908 | target->options = source->options; |
0f5f49b8 | 909 | target->auth_info = source->auth_info; |
89a6814d | 910 | target->port = source->port; |
54ceac45 | 911 | } |
89d77c8f | 912 | EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); |
54ceac45 | 913 | |
fcf10398 | 914 | void nfs_server_insert_lists(struct nfs_server *server) |
fca5238e CL |
915 | { |
916 | struct nfs_client *clp = server->nfs_client; | |
73ea666c | 917 | struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); |
fca5238e | 918 | |
dc030858 | 919 | spin_lock(&nn->nfs_client_lock); |
fca5238e | 920 | list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); |
c25d32b2 | 921 | list_add_tail(&server->master_link, &nn->nfs_volume_list); |
d3b4c9d7 | 922 | clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); |
dc030858 | 923 | spin_unlock(&nn->nfs_client_lock); |
fca5238e CL |
924 | |
925 | } | |
89d77c8f | 926 | EXPORT_SYMBOL_GPL(nfs_server_insert_lists); |
fca5238e | 927 | |
32e62b7c | 928 | void nfs_server_remove_lists(struct nfs_server *server) |
fca5238e | 929 | { |
d3b4c9d7 | 930 | struct nfs_client *clp = server->nfs_client; |
4c03ae4a | 931 | struct nfs_net *nn; |
d3b4c9d7 | 932 | |
4c03ae4a TM |
933 | if (clp == NULL) |
934 | return; | |
73ea666c | 935 | nn = net_generic(clp->cl_net, nfs_net_id); |
dc030858 | 936 | spin_lock(&nn->nfs_client_lock); |
fca5238e | 937 | list_del_rcu(&server->client_link); |
4c03ae4a | 938 | if (list_empty(&clp->cl_superblocks)) |
d3b4c9d7 | 939 | set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); |
fca5238e | 940 | list_del(&server->master_link); |
dc030858 | 941 | spin_unlock(&nn->nfs_client_lock); |
fca5238e CL |
942 | |
943 | synchronize_rcu(); | |
944 | } | |
32e62b7c | 945 | EXPORT_SYMBOL_GPL(nfs_server_remove_lists); |
fca5238e | 946 | |
54ceac45 DH |
947 | /* |
948 | * Allocate and initialise a server record | |
949 | */ | |
fcf10398 | 950 | struct nfs_server *nfs_alloc_server(void) |
54ceac45 DH |
951 | { |
952 | struct nfs_server *server; | |
953 | ||
954 | server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); | |
955 | if (!server) | |
956 | return NULL; | |
957 | ||
958 | server->client = server->client_acl = ERR_PTR(-EINVAL); | |
959 | ||
960 | /* Zero out the NFS state stuff */ | |
961 | INIT_LIST_HEAD(&server->client_link); | |
962 | INIT_LIST_HEAD(&server->master_link); | |
d3978bb3 | 963 | INIT_LIST_HEAD(&server->delegations); |
6382a441 | 964 | INIT_LIST_HEAD(&server->layouts); |
0aaaf5c4 | 965 | INIT_LIST_HEAD(&server->state_owners_lru); |
62164f31 | 966 | INIT_LIST_HEAD(&server->ss_copies); |
54ceac45 | 967 | |
ef818a28 SD |
968 | atomic_set(&server->active, 0); |
969 | ||
54ceac45 DH |
970 | server->io_stats = nfs_alloc_iostats(); |
971 | if (!server->io_stats) { | |
972 | kfree(server); | |
973 | return NULL; | |
974 | } | |
975 | ||
7f08a335 TM |
976 | server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; |
977 | ||
9157c31d | 978 | ida_init(&server->openowner_id); |
d2d7ce28 | 979 | ida_init(&server->lockowner_id); |
f7e8917a | 980 | pnfs_init_server(server); |
68ebf8fe | 981 | rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); |
f7e8917a | 982 | |
54ceac45 DH |
983 | return server; |
984 | } | |
89d77c8f | 985 | EXPORT_SYMBOL_GPL(nfs_alloc_server); |
54ceac45 DH |
986 | |
987 | /* | |
988 | * Free up a server record | |
989 | */ | |
990 | void nfs_free_server(struct nfs_server *server) | |
991 | { | |
fca5238e | 992 | nfs_server_remove_lists(server); |
54ceac45 DH |
993 | |
994 | if (server->destroy != NULL) | |
995 | server->destroy(server); | |
5cef338b TM |
996 | |
997 | if (!IS_ERR(server->client_acl)) | |
998 | rpc_shutdown_client(server->client_acl); | |
54ceac45 DH |
999 | if (!IS_ERR(server->client)) |
1000 | rpc_shutdown_client(server->client); | |
1001 | ||
1002 | nfs_put_client(server->nfs_client); | |
1003 | ||
d2d7ce28 | 1004 | ida_destroy(&server->lockowner_id); |
9157c31d | 1005 | ida_destroy(&server->openowner_id); |
54ceac45 | 1006 | nfs_free_iostats(server->io_stats); |
1a58e8a0 | 1007 | put_cred(server->cred); |
54ceac45 DH |
1008 | kfree(server); |
1009 | nfs_release_automount_timer(); | |
54ceac45 | 1010 | } |
89d77c8f | 1011 | EXPORT_SYMBOL_GPL(nfs_free_server); |
54ceac45 DH |
1012 | |
1013 | /* | |
1014 | * Create a version 2 or 3 volume record | |
1015 | * - keyed on server and FSID | |
1016 | */ | |
62a55d08 | 1017 | struct nfs_server *nfs_create_server(struct fs_context *fc) |
54ceac45 | 1018 | { |
62a55d08 | 1019 | struct nfs_fs_context *ctx = nfs_fc2context(fc); |
54ceac45 | 1020 | struct nfs_server *server; |
fbca779a | 1021 | struct nfs_fattr *fattr; |
54ceac45 DH |
1022 | int error; |
1023 | ||
1024 | server = nfs_alloc_server(); | |
1025 | if (!server) | |
1026 | return ERR_PTR(-ENOMEM); | |
1027 | ||
d18a9d3f | 1028 | server->cred = get_cred(fc->cred); |
1a58e8a0 | 1029 | |
fbca779a TM |
1030 | error = -ENOMEM; |
1031 | fattr = nfs_alloc_fattr(); | |
1032 | if (fattr == NULL) | |
1033 | goto error; | |
1034 | ||
54ceac45 | 1035 | /* Get a client representation */ |
62a55d08 | 1036 | error = nfs_init_server(server, fc); |
54ceac45 DH |
1037 | if (error < 0) |
1038 | goto error; | |
1039 | ||
54ceac45 | 1040 | /* Probe the root fh to retrieve its FSID */ |
62a55d08 | 1041 | error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); |
54ceac45 DH |
1042 | if (error < 0) |
1043 | goto error; | |
54af3bb5 TM |
1044 | if (server->nfs_client->rpc_ops->version == 3) { |
1045 | if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) | |
1046 | server->namelen = NFS3_MAXNAMLEN; | |
62a55d08 | 1047 | if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) |
54af3bb5 TM |
1048 | server->caps |= NFS_CAP_READDIRPLUS; |
1049 | } else { | |
1050 | if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) | |
1051 | server->namelen = NFS2_MAXNAMLEN; | |
1052 | } | |
1053 | ||
fbca779a | 1054 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
62a55d08 | 1055 | error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, |
2ef61e0e | 1056 | fattr, NULL); |
54ceac45 DH |
1057 | if (error < 0) { |
1058 | dprintk("nfs_create_server: getattr error = %d\n", -error); | |
1059 | goto error; | |
1060 | } | |
1061 | } | |
fbca779a | 1062 | memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); |
54ceac45 | 1063 | |
6daabf1b DH |
1064 | dprintk("Server FSID: %llx:%llx\n", |
1065 | (unsigned long long) server->fsid.major, | |
1066 | (unsigned long long) server->fsid.minor); | |
54ceac45 | 1067 | |
fca5238e | 1068 | nfs_server_insert_lists(server); |
54ceac45 | 1069 | server->mount_time = jiffies; |
fbca779a | 1070 | nfs_free_fattr(fattr); |
54ceac45 DH |
1071 | return server; |
1072 | ||
1073 | error: | |
fbca779a | 1074 | nfs_free_fattr(fattr); |
54ceac45 DH |
1075 | nfs_free_server(server); |
1076 | return ERR_PTR(error); | |
1077 | } | |
ddda8e0a | 1078 | EXPORT_SYMBOL_GPL(nfs_create_server); |
54ceac45 | 1079 | |
54ceac45 DH |
1080 | /* |
1081 | * Clone an NFS2, NFS3 or NFS4 server record | |
1082 | */ | |
1083 | struct nfs_server *nfs_clone_server(struct nfs_server *source, | |
1084 | struct nfs_fh *fh, | |
7e6eb683 BS |
1085 | struct nfs_fattr *fattr, |
1086 | rpc_authflavor_t flavor) | |
54ceac45 DH |
1087 | { |
1088 | struct nfs_server *server; | |
54ceac45 DH |
1089 | int error; |
1090 | ||
54ceac45 DH |
1091 | server = nfs_alloc_server(); |
1092 | if (!server) | |
1093 | return ERR_PTR(-ENOMEM); | |
1094 | ||
1a58e8a0 TM |
1095 | server->cred = get_cred(source->cred); |
1096 | ||
54ceac45 DH |
1097 | /* Copy data from the source */ |
1098 | server->nfs_client = source->nfs_client; | |
0aaaf5c4 | 1099 | server->destroy = source->destroy; |
212bf41d | 1100 | refcount_inc(&server->nfs_client->cl_count); |
54ceac45 DH |
1101 | nfs_server_copy_userdata(server, source); |
1102 | ||
1103 | server->fsid = fattr->fsid; | |
1104 | ||
33170233 TM |
1105 | error = nfs_init_server_rpcclient(server, |
1106 | source->client->cl_timeout, | |
7e6eb683 | 1107 | flavor); |
54ceac45 DH |
1108 | if (error < 0) |
1109 | goto out_free_server; | |
54ceac45 DH |
1110 | |
1111 | /* probe the filesystem info for this server filesystem */ | |
4d4cf8d2 | 1112 | error = nfs_probe_server(server, fh); |
54ceac45 DH |
1113 | if (error < 0) |
1114 | goto out_free_server; | |
1115 | ||
54af3bb5 TM |
1116 | if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) |
1117 | server->namelen = NFS4_MAXNAMLEN; | |
1118 | ||
54ceac45 DH |
1119 | error = nfs_start_lockd(server); |
1120 | if (error < 0) | |
1121 | goto out_free_server; | |
1122 | ||
fca5238e | 1123 | nfs_server_insert_lists(server); |
54ceac45 DH |
1124 | server->mount_time = jiffies; |
1125 | ||
54ceac45 DH |
1126 | return server; |
1127 | ||
1128 | out_free_server: | |
1129 | nfs_free_server(server); | |
54ceac45 DH |
1130 | return ERR_PTR(error); |
1131 | } | |
ddda8e0a | 1132 | EXPORT_SYMBOL_GPL(nfs_clone_server); |
6aaca566 | 1133 | |
6b13168b SK |
1134 | void nfs_clients_init(struct net *net) |
1135 | { | |
1136 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
1137 | ||
1138 | INIT_LIST_HEAD(&nn->nfs_client_list); | |
c25d32b2 | 1139 | INIT_LIST_HEAD(&nn->nfs_volume_list); |
89d77c8f | 1140 | #if IS_ENABLED(CONFIG_NFS_V4) |
28cd1b3f SK |
1141 | idr_init(&nn->cb_ident_idr); |
1142 | #endif | |
4c03ae4a | 1143 | spin_lock_init(&nn->nfs_client_lock); |
2f86e091 | 1144 | nn->boot_time = ktime_get_real(); |
bf11fbdb TM |
1145 | |
1146 | nfs_netns_sysfs_setup(nn, net); | |
6b13168b SK |
1147 | } |
1148 | ||
10b7a70c TM |
1149 | void nfs_clients_exit(struct net *net) |
1150 | { | |
1151 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
1152 | ||
bf11fbdb | 1153 | nfs_netns_sysfs_destroy(nn); |
10b7a70c TM |
1154 | nfs_cleanup_cb_ident_idr(net); |
1155 | WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); | |
1156 | WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); | |
1157 | } | |
1158 | ||
6aaca566 | 1159 | #ifdef CONFIG_PROC_FS |
6aaca566 DH |
1160 | static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); |
1161 | static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); | |
1162 | static void nfs_server_list_stop(struct seq_file *p, void *v); | |
1163 | static int nfs_server_list_show(struct seq_file *m, void *v); | |
1164 | ||
88e9d34c | 1165 | static const struct seq_operations nfs_server_list_ops = { |
6aaca566 DH |
1166 | .start = nfs_server_list_start, |
1167 | .next = nfs_server_list_next, | |
1168 | .stop = nfs_server_list_stop, | |
1169 | .show = nfs_server_list_show, | |
1170 | }; | |
1171 | ||
6aaca566 DH |
1172 | static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); |
1173 | static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); | |
1174 | static void nfs_volume_list_stop(struct seq_file *p, void *v); | |
1175 | static int nfs_volume_list_show(struct seq_file *m, void *v); | |
1176 | ||
88e9d34c | 1177 | static const struct seq_operations nfs_volume_list_ops = { |
6aaca566 DH |
1178 | .start = nfs_volume_list_start, |
1179 | .next = nfs_volume_list_next, | |
1180 | .stop = nfs_volume_list_stop, | |
1181 | .show = nfs_volume_list_show, | |
1182 | }; | |
1183 | ||
6aaca566 DH |
1184 | /* |
1185 | * set up the iterator to start reading from the server list and return the first item | |
1186 | */ | |
1187 | static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) | |
8d11620e | 1188 | __acquires(&nn->nfs_client_lock) |
6aaca566 | 1189 | { |
65b38851 | 1190 | struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); |
6b13168b | 1191 | |
6aaca566 | 1192 | /* lock the list against modification */ |
dc030858 | 1193 | spin_lock(&nn->nfs_client_lock); |
6b13168b | 1194 | return seq_list_start_head(&nn->nfs_client_list, *_pos); |
6aaca566 DH |
1195 | } |
1196 | ||
1197 | /* | |
1198 | * move to next server | |
1199 | */ | |
1200 | static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) | |
1201 | { | |
65b38851 | 1202 | struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); |
6b13168b SK |
1203 | |
1204 | return seq_list_next(v, &nn->nfs_client_list, pos); | |
6aaca566 DH |
1205 | } |
1206 | ||
1207 | /* | |
1208 | * clean up after reading from the transports list | |
1209 | */ | |
1210 | static void nfs_server_list_stop(struct seq_file *p, void *v) | |
8d11620e | 1211 | __releases(&nn->nfs_client_lock) |
6aaca566 | 1212 | { |
65b38851 | 1213 | struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); |
dc030858 SK |
1214 | |
1215 | spin_unlock(&nn->nfs_client_lock); | |
6aaca566 DH |
1216 | } |
1217 | ||
1218 | /* | |
1219 | * display a header line followed by a load of call lines | |
1220 | */ | |
1221 | static int nfs_server_list_show(struct seq_file *m, void *v) | |
1222 | { | |
1223 | struct nfs_client *clp; | |
65b38851 | 1224 | struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); |
6aaca566 DH |
1225 | |
1226 | /* display header on line 1 */ | |
6b13168b | 1227 | if (v == &nn->nfs_client_list) { |
6aaca566 DH |
1228 | seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); |
1229 | return 0; | |
1230 | } | |
1231 | ||
1232 | /* display one transport per line on subsequent lines */ | |
1233 | clp = list_entry(v, struct nfs_client, cl_share_link); | |
1234 | ||
940aab49 MN |
1235 | /* Check if the client is initialized */ |
1236 | if (clp->cl_cons_state != NFS_CS_READY) | |
1237 | return 0; | |
1238 | ||
2446ab60 | 1239 | rcu_read_lock(); |
5d8515ca | 1240 | seq_printf(m, "v%u %s %s %3d %s\n", |
40c55319 | 1241 | clp->rpc_ops->version, |
5d8515ca CL |
1242 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), |
1243 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), | |
212bf41d | 1244 | refcount_read(&clp->cl_count), |
6aaca566 | 1245 | clp->cl_hostname); |
2446ab60 | 1246 | rcu_read_unlock(); |
6aaca566 DH |
1247 | |
1248 | return 0; | |
1249 | } | |
1250 | ||
6aaca566 DH |
1251 | /* |
1252 | * set up the iterator to start reading from the volume list and return the first item | |
1253 | */ | |
1254 | static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) | |
8d11620e | 1255 | __acquires(&nn->nfs_client_lock) |
6aaca566 | 1256 | { |
65b38851 | 1257 | struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); |
c25d32b2 | 1258 | |
6aaca566 | 1259 | /* lock the list against modification */ |
dc030858 | 1260 | spin_lock(&nn->nfs_client_lock); |
c25d32b2 | 1261 | return seq_list_start_head(&nn->nfs_volume_list, *_pos); |
6aaca566 DH |
1262 | } |
1263 | ||
1264 | /* | |
1265 | * move to next volume | |
1266 | */ | |
1267 | static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) | |
1268 | { | |
65b38851 | 1269 | struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); |
c25d32b2 SK |
1270 | |
1271 | return seq_list_next(v, &nn->nfs_volume_list, pos); | |
6aaca566 DH |
1272 | } |
1273 | ||
1274 | /* | |
1275 | * clean up after reading from the transports list | |
1276 | */ | |
1277 | static void nfs_volume_list_stop(struct seq_file *p, void *v) | |
8d11620e | 1278 | __releases(&nn->nfs_client_lock) |
6aaca566 | 1279 | { |
65b38851 | 1280 | struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); |
dc030858 SK |
1281 | |
1282 | spin_unlock(&nn->nfs_client_lock); | |
6aaca566 DH |
1283 | } |
1284 | ||
1285 | /* | |
1286 | * display a header line followed by a load of call lines | |
1287 | */ | |
1288 | static int nfs_volume_list_show(struct seq_file *m, void *v) | |
1289 | { | |
1290 | struct nfs_server *server; | |
1291 | struct nfs_client *clp; | |
df05a49f KM |
1292 | char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' |
1293 | char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' | |
65b38851 | 1294 | struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); |
6aaca566 DH |
1295 | |
1296 | /* display header on line 1 */ | |
c25d32b2 | 1297 | if (v == &nn->nfs_volume_list) { |
df05a49f KM |
1298 | seq_puts(m, "NV SERVER PORT DEV FSID" |
1299 | " FSC\n"); | |
6aaca566 DH |
1300 | return 0; |
1301 | } | |
1302 | /* display one transport per line on subsequent lines */ | |
1303 | server = list_entry(v, struct nfs_server, master_link); | |
1304 | clp = server->nfs_client; | |
1305 | ||
df05a49f | 1306 | snprintf(dev, sizeof(dev), "%u:%u", |
6aaca566 DH |
1307 | MAJOR(server->s_dev), MINOR(server->s_dev)); |
1308 | ||
df05a49f | 1309 | snprintf(fsid, sizeof(fsid), "%llx:%llx", |
6daabf1b DH |
1310 | (unsigned long long) server->fsid.major, |
1311 | (unsigned long long) server->fsid.minor); | |
6aaca566 | 1312 | |
2446ab60 | 1313 | rcu_read_lock(); |
df05a49f | 1314 | seq_printf(m, "v%u %s %s %-12s %-33s %s\n", |
40c55319 | 1315 | clp->rpc_ops->version, |
5d8515ca CL |
1316 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), |
1317 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), | |
6aaca566 | 1318 | dev, |
5d1acff1 DH |
1319 | fsid, |
1320 | nfs_server_fscache_state(server)); | |
2446ab60 | 1321 | rcu_read_unlock(); |
6aaca566 DH |
1322 | |
1323 | return 0; | |
1324 | } | |
1325 | ||
65b38851 EB |
1326 | int nfs_fs_proc_net_init(struct net *net) |
1327 | { | |
1328 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
1329 | struct proc_dir_entry *p; | |
1330 | ||
1331 | nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); | |
1332 | if (!nn->proc_nfsfs) | |
1333 | goto error_0; | |
1334 | ||
1335 | /* a file of servers with which we're dealing */ | |
c3506372 CH |
1336 | p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, |
1337 | &nfs_server_list_ops, sizeof(struct seq_net_private)); | |
65b38851 EB |
1338 | if (!p) |
1339 | goto error_1; | |
1340 | ||
1341 | /* a file of volumes that we have mounted */ | |
c3506372 CH |
1342 | p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, |
1343 | &nfs_volume_list_ops, sizeof(struct seq_net_private)); | |
65b38851 | 1344 | if (!p) |
21e81002 | 1345 | goto error_1; |
65b38851 EB |
1346 | return 0; |
1347 | ||
65b38851 | 1348 | error_1: |
21e81002 | 1349 | remove_proc_subtree("nfsfs", net->proc_net); |
65b38851 EB |
1350 | error_0: |
1351 | return -ENOMEM; | |
1352 | } | |
1353 | ||
1354 | void nfs_fs_proc_net_exit(struct net *net) | |
1355 | { | |
21e81002 | 1356 | remove_proc_subtree("nfsfs", net->proc_net); |
65b38851 EB |
1357 | } |
1358 | ||
6aaca566 DH |
1359 | /* |
1360 | * initialise the /proc/fs/nfsfs/ directory | |
1361 | */ | |
1362 | int __init nfs_fs_proc_init(void) | |
1363 | { | |
6a062a36 | 1364 | if (!proc_mkdir("fs/nfsfs", NULL)) |
6aaca566 DH |
1365 | goto error_0; |
1366 | ||
6aaca566 | 1367 | /* a file of servers with which we're dealing */ |
6a062a36 | 1368 | if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) |
6aaca566 DH |
1369 | goto error_1; |
1370 | ||
6aaca566 | 1371 | /* a file of volumes that we have mounted */ |
6a062a36 KM |
1372 | if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) |
1373 | goto error_1; | |
6aaca566 | 1374 | |
6a062a36 | 1375 | return 0; |
6aaca566 | 1376 | error_1: |
6a062a36 | 1377 | remove_proc_subtree("fs/nfsfs", NULL); |
6aaca566 DH |
1378 | error_0: |
1379 | return -ENOMEM; | |
1380 | } | |
1381 | ||
1382 | /* | |
1383 | * clean up the /proc/fs/nfsfs/ directory | |
1384 | */ | |
1385 | void nfs_fs_proc_exit(void) | |
1386 | { | |
6a062a36 | 1387 | remove_proc_subtree("fs/nfsfs", NULL); |
6aaca566 DH |
1388 | } |
1389 | ||
1390 | #endif /* CONFIG_PROC_FS */ |