Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/lockd/host.c | |
4 | * | |
5 | * Management for NLM peer hosts. The nlm_host struct is shared | |
6 | * between client and server implementation. The only reason to | |
7 | * do so is to reduce code bloat. | |
8 | * | |
9 | * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> | |
10 | */ | |
11 | ||
12 | #include <linux/types.h> | |
1da177e4 LT |
13 | #include <linux/slab.h> |
14 | #include <linux/in.h> | |
1b333c54 | 15 | #include <linux/in6.h> |
1da177e4 | 16 | #include <linux/sunrpc/clnt.h> |
5976687a | 17 | #include <linux/sunrpc/addr.h> |
1da177e4 LT |
18 | #include <linux/sunrpc/svc.h> |
19 | #include <linux/lockd/lockd.h> | |
353ab6e9 | 20 | #include <linux/mutex.h> |
1da177e4 | 21 | |
66697bfd SK |
22 | #include <linux/sunrpc/svc_xprt.h> |
23 | ||
1b333c54 | 24 | #include <net/ipv6.h> |
1da177e4 | 25 | |
3cf7fb07 SK |
26 | #include "netns.h" |
27 | ||
1da177e4 | 28 | #define NLMDBG_FACILITY NLMDBG_HOSTCACHE |
1da177e4 | 29 | #define NLM_HOST_NRHASH 32 |
1da177e4 | 30 | #define NLM_HOST_REBIND (60 * HZ) |
1447d25e N |
31 | #define NLM_HOST_EXPIRE (300 * HZ) |
32 | #define NLM_HOST_COLLECT (120 * HZ) | |
1da177e4 | 33 | |
d2df0484 | 34 | static struct hlist_head nlm_server_hosts[NLM_HOST_NRHASH]; |
8ea6ecc8 | 35 | static struct hlist_head nlm_client_hosts[NLM_HOST_NRHASH]; |
b1137468 | 36 | |
b67bfe0d | 37 | #define for_each_host(host, chain, table) \ |
b1137468 BF |
38 | for ((chain) = (table); \ |
39 | (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \ | |
b67bfe0d | 40 | hlist_for_each_entry((host), (chain), h_hash) |
b1137468 | 41 | |
b67bfe0d | 42 | #define for_each_host_safe(host, next, chain, table) \ |
b1137468 BF |
43 | for ((chain) = (table); \ |
44 | (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \ | |
b67bfe0d | 45 | hlist_for_each_entry_safe((host), (next), \ |
b1137468 BF |
46 | (chain), h_hash) |
47 | ||
fcc072c7 | 48 | static unsigned long nrhosts; |
353ab6e9 | 49 | static DEFINE_MUTEX(nlm_host_mutex); |
1da177e4 | 50 | |
27adaddc | 51 | static void nlm_gc_hosts(struct net *net); |
1da177e4 | 52 | |
7f1ed18b CL |
53 | struct nlm_lookup_host_info { |
54 | const int server; /* search for server|client */ | |
88541c84 CL |
55 | const struct sockaddr *sap; /* address to search for */ |
56 | const size_t salen; /* it's length */ | |
7f1ed18b CL |
57 | const unsigned short protocol; /* transport to search for*/ |
58 | const u32 version; /* NLM version to search for */ | |
59 | const char *hostname; /* remote's hostname */ | |
60 | const size_t hostname_len; /* it's length */ | |
0cb2659b | 61 | const int noresvport; /* use non-priv port */ |
66697bfd | 62 | struct net *net; /* network namespace to bind */ |
7f1ed18b CL |
63 | }; |
64 | ||
ede2fea0 CL |
65 | /* |
66 | * Hash function must work well on big- and little-endian platforms | |
67 | */ | |
68 | static unsigned int __nlm_hash32(const __be32 n) | |
69 | { | |
70 | unsigned int hash = (__force u32)n ^ ((__force u32)n >> 16); | |
71 | return hash ^ (hash >> 8); | |
72 | } | |
73 | ||
74 | static unsigned int __nlm_hash_addr4(const struct sockaddr *sap) | |
75 | { | |
76 | const struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
77 | return __nlm_hash32(sin->sin_addr.s_addr); | |
78 | } | |
79 | ||
80 | static unsigned int __nlm_hash_addr6(const struct sockaddr *sap) | |
81 | { | |
82 | const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
83 | const struct in6_addr addr = sin6->sin6_addr; | |
84 | return __nlm_hash32(addr.s6_addr32[0]) ^ | |
85 | __nlm_hash32(addr.s6_addr32[1]) ^ | |
86 | __nlm_hash32(addr.s6_addr32[2]) ^ | |
87 | __nlm_hash32(addr.s6_addr32[3]); | |
88 | } | |
89 | ||
90 | static unsigned int nlm_hash_address(const struct sockaddr *sap) | |
91 | { | |
92 | unsigned int hash; | |
93 | ||
94 | switch (sap->sa_family) { | |
95 | case AF_INET: | |
96 | hash = __nlm_hash_addr4(sap); | |
97 | break; | |
98 | case AF_INET6: | |
99 | hash = __nlm_hash_addr6(sap); | |
100 | break; | |
101 | default: | |
102 | hash = 0; | |
103 | } | |
104 | return hash & (NLM_HOST_NRHASH - 1); | |
105 | } | |
106 | ||
a7952f40 CL |
107 | /* |
108 | * Allocate and initialize an nlm_host. Common to both client and server. | |
109 | */ | |
110 | static struct nlm_host *nlm_alloc_host(struct nlm_lookup_host_info *ni, | |
111 | struct nsm_handle *nsm) | |
112 | { | |
113 | struct nlm_host *host = NULL; | |
114 | unsigned long now = jiffies; | |
115 | ||
116 | if (nsm != NULL) | |
117 | atomic_inc(&nsm->sm_count); | |
118 | else { | |
119 | host = NULL; | |
0ad95472 | 120 | nsm = nsm_get_handle(ni->net, ni->sap, ni->salen, |
a7952f40 CL |
121 | ni->hostname, ni->hostname_len); |
122 | if (unlikely(nsm == NULL)) { | |
123 | dprintk("lockd: %s failed; no nsm handle\n", | |
124 | __func__); | |
125 | goto out; | |
126 | } | |
127 | } | |
128 | ||
129 | host = kmalloc(sizeof(*host), GFP_KERNEL); | |
130 | if (unlikely(host == NULL)) { | |
131 | dprintk("lockd: %s failed; no memory\n", __func__); | |
132 | nsm_release(nsm); | |
133 | goto out; | |
134 | } | |
135 | ||
136 | memcpy(nlm_addr(host), ni->sap, ni->salen); | |
137 | host->h_addrlen = ni->salen; | |
138 | rpc_set_port(nlm_addr(host), 0); | |
139 | host->h_srcaddrlen = 0; | |
140 | ||
141 | host->h_rpcclnt = NULL; | |
142 | host->h_name = nsm->sm_name; | |
143 | host->h_version = ni->version; | |
144 | host->h_proto = ni->protocol; | |
145 | host->h_reclaiming = 0; | |
146 | host->h_server = ni->server; | |
147 | host->h_noresvport = ni->noresvport; | |
148 | host->h_inuse = 0; | |
149 | init_waitqueue_head(&host->h_gracewait); | |
150 | init_rwsem(&host->h_rwsem); | |
151 | host->h_state = 0; | |
152 | host->h_nsmstate = 0; | |
153 | host->h_pidcount = 0; | |
154 | atomic_set(&host->h_count, 1); | |
155 | mutex_init(&host->h_mutex); | |
156 | host->h_nextrebind = now + NLM_HOST_REBIND; | |
157 | host->h_expires = now + NLM_HOST_EXPIRE; | |
158 | INIT_LIST_HEAD(&host->h_lockowners); | |
159 | spin_lock_init(&host->h_lock); | |
160 | INIT_LIST_HEAD(&host->h_granted); | |
161 | INIT_LIST_HEAD(&host->h_reclaim); | |
162 | host->h_nsmhandle = nsm; | |
163 | host->h_addrbuf = nsm->sm_addrbuf; | |
66697bfd | 164 | host->net = ni->net; |
0d0f4aab | 165 | strlcpy(host->nodename, utsname()->nodename, sizeof(host->nodename)); |
a7952f40 CL |
166 | |
167 | out: | |
168 | return host; | |
169 | } | |
170 | ||
c53c1bb9 | 171 | /* |
723bb5b5 CL |
172 | * Destroy an nlm_host and free associated resources |
173 | * | |
174 | * Caller must hold nlm_host_mutex. | |
c53c1bb9 | 175 | */ |
723bb5b5 | 176 | static void nlm_destroy_host_locked(struct nlm_host *host) |
c53c1bb9 OK |
177 | { |
178 | struct rpc_clnt *clnt; | |
caa4e76b | 179 | struct lockd_net *ln = net_generic(host->net, lockd_net_id); |
c53c1bb9 | 180 | |
723bb5b5 CL |
181 | dprintk("lockd: destroy host %s\n", host->h_name); |
182 | ||
723bb5b5 CL |
183 | hlist_del_init(&host->h_hash); |
184 | ||
c53c1bb9 | 185 | nsm_unmonitor(host); |
c8c23c42 | 186 | nsm_release(host->h_nsmhandle); |
c53c1bb9 | 187 | |
34f52e35 TM |
188 | clnt = host->h_rpcclnt; |
189 | if (clnt != NULL) | |
190 | rpc_shutdown_client(clnt); | |
c53c1bb9 | 191 | kfree(host); |
723bb5b5 | 192 | |
caa4e76b | 193 | ln->nrhosts--; |
723bb5b5 | 194 | nrhosts--; |
c53c1bb9 OK |
195 | } |
196 | ||
d7d20440 CL |
197 | /** |
198 | * nlmclnt_lookup_host - Find an NLM host handle matching a remote server | |
199 | * @sap: network address of server | |
200 | * @salen: length of server address | |
201 | * @protocol: transport protocol to use | |
202 | * @version: NLM protocol version | |
203 | * @hostname: '\0'-terminated hostname of server | |
0cb2659b | 204 | * @noresvport: 1 if non-privileged port should be used |
d7d20440 CL |
205 | * |
206 | * Returns an nlm_host structure that matches the passed-in | |
207 | * [server address, transport protocol, NLM version, server hostname]. | |
208 | * If one doesn't already exist in the host cache, a new handle is | |
209 | * created and returned. | |
c585646d | 210 | */ |
d7d20440 CL |
211 | struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap, |
212 | const size_t salen, | |
213 | const unsigned short protocol, | |
0cb2659b CL |
214 | const u32 version, |
215 | const char *hostname, | |
66697bfd SK |
216 | int noresvport, |
217 | struct net *net) | |
c585646d | 218 | { |
7f1ed18b CL |
219 | struct nlm_lookup_host_info ni = { |
220 | .server = 0, | |
d7d20440 CL |
221 | .sap = sap, |
222 | .salen = salen, | |
223 | .protocol = protocol, | |
7f1ed18b CL |
224 | .version = version, |
225 | .hostname = hostname, | |
d7d20440 | 226 | .hostname_len = strlen(hostname), |
0cb2659b | 227 | .noresvport = noresvport, |
66697bfd | 228 | .net = net, |
7f1ed18b | 229 | }; |
8ea6ecc8 | 230 | struct hlist_head *chain; |
8ea6ecc8 CL |
231 | struct nlm_host *host; |
232 | struct nsm_handle *nsm = NULL; | |
caa4e76b | 233 | struct lockd_net *ln = net_generic(net, lockd_net_id); |
c98451bd | 234 | |
7f1ed18b CL |
235 | dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__, |
236 | (hostname ? hostname : "<none>"), version, | |
d7d20440 | 237 | (protocol == IPPROTO_UDP ? "udp" : "tcp")); |
7f1ed18b | 238 | |
8ea6ecc8 CL |
239 | mutex_lock(&nlm_host_mutex); |
240 | ||
241 | chain = &nlm_client_hosts[nlm_hash_address(sap)]; | |
b67bfe0d | 242 | hlist_for_each_entry(host, chain, h_hash) { |
66697bfd SK |
243 | if (host->net != net) |
244 | continue; | |
8ea6ecc8 CL |
245 | if (!rpc_cmp_addr(nlm_addr(host), sap)) |
246 | continue; | |
247 | ||
248 | /* Same address. Share an NSM handle if we already have one */ | |
249 | if (nsm == NULL) | |
250 | nsm = host->h_nsmhandle; | |
251 | ||
252 | if (host->h_proto != protocol) | |
253 | continue; | |
254 | if (host->h_version != version) | |
255 | continue; | |
256 | ||
257 | nlm_get_host(host); | |
258 | dprintk("lockd: %s found host %s (%s)\n", __func__, | |
259 | host->h_name, host->h_addrbuf); | |
260 | goto out; | |
261 | } | |
262 | ||
263 | host = nlm_alloc_host(&ni, nsm); | |
264 | if (unlikely(host == NULL)) | |
265 | goto out; | |
266 | ||
267 | hlist_add_head(&host->h_hash, chain); | |
caa4e76b | 268 | ln->nrhosts++; |
8ea6ecc8 CL |
269 | nrhosts++; |
270 | ||
271 | dprintk("lockd: %s created host %s (%s)\n", __func__, | |
272 | host->h_name, host->h_addrbuf); | |
273 | ||
274 | out: | |
275 | mutex_unlock(&nlm_host_mutex); | |
276 | return host; | |
277 | } | |
278 | ||
279 | /** | |
280 | * nlmclnt_release_host - release client nlm_host | |
281 | * @host: nlm_host to release | |
282 | * | |
283 | */ | |
284 | void nlmclnt_release_host(struct nlm_host *host) | |
285 | { | |
286 | if (host == NULL) | |
287 | return; | |
288 | ||
289 | dprintk("lockd: release client host %s\n", host->h_name); | |
290 | ||
a2d30a54 | 291 | WARN_ON_ONCE(host->h_server); |
8ea6ecc8 CL |
292 | |
293 | if (atomic_dec_and_test(&host->h_count)) { | |
a2d30a54 TM |
294 | WARN_ON_ONCE(!list_empty(&host->h_lockowners)); |
295 | WARN_ON_ONCE(!list_empty(&host->h_granted)); | |
296 | WARN_ON_ONCE(!list_empty(&host->h_reclaim)); | |
8ea6ecc8 CL |
297 | |
298 | mutex_lock(&nlm_host_mutex); | |
299 | nlm_destroy_host_locked(host); | |
300 | mutex_unlock(&nlm_host_mutex); | |
301 | } | |
c585646d AB |
302 | } |
303 | ||
6bfbe8af CL |
304 | /** |
305 | * nlmsvc_lookup_host - Find an NLM host handle matching a remote client | |
306 | * @rqstp: incoming NLM request | |
307 | * @hostname: name of client host | |
308 | * @hostname_len: length of client hostname | |
309 | * | |
310 | * Returns an nlm_host structure that matches the [client address, | |
311 | * transport protocol, NLM version, client hostname] of the passed-in | |
312 | * NLM request. If one doesn't already exist in the host cache, a | |
313 | * new handle is created and returned. | |
314 | * | |
315 | * Before possibly creating a new nlm_host, construct a sockaddr | |
316 | * for a specific source address in case the local system has | |
317 | * multiple network addresses. The family of the address in | |
318 | * rq_daddr is guaranteed to be the same as the family of the | |
319 | * address in rq_addr, so it's safe to use the same family for | |
320 | * the source address. | |
c585646d | 321 | */ |
6bfbe8af CL |
322 | struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp, |
323 | const char *hostname, | |
324 | const size_t hostname_len) | |
c585646d | 325 | { |
67216b94 | 326 | struct hlist_head *chain; |
67216b94 CL |
327 | struct nlm_host *host = NULL; |
328 | struct nsm_handle *nsm = NULL; | |
849a1cf1 MJ |
329 | struct sockaddr *src_sap = svc_daddr(rqstp); |
330 | size_t src_len = rqstp->rq_daddrlen; | |
9695c705 | 331 | struct net *net = SVC_NET(rqstp); |
7f1ed18b CL |
332 | struct nlm_lookup_host_info ni = { |
333 | .server = 1, | |
88541c84 CL |
334 | .sap = svc_addr(rqstp), |
335 | .salen = rqstp->rq_addrlen, | |
7f1ed18b CL |
336 | .protocol = rqstp->rq_prot, |
337 | .version = rqstp->rq_vers, | |
338 | .hostname = hostname, | |
339 | .hostname_len = hostname_len, | |
66697bfd | 340 | .net = net, |
7f1ed18b | 341 | }; |
3cf7fb07 | 342 | struct lockd_net *ln = net_generic(net, lockd_net_id); |
7f1ed18b CL |
343 | |
344 | dprintk("lockd: %s(host='%*s', vers=%u, proto=%s)\n", __func__, | |
345 | (int)hostname_len, hostname, rqstp->rq_vers, | |
346 | (rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp")); | |
c98451bd | 347 | |
67216b94 CL |
348 | mutex_lock(&nlm_host_mutex); |
349 | ||
3cf7fb07 | 350 | if (time_after_eq(jiffies, ln->next_gc)) |
27adaddc | 351 | nlm_gc_hosts(net); |
67216b94 | 352 | |
d2df0484 | 353 | chain = &nlm_server_hosts[nlm_hash_address(ni.sap)]; |
b67bfe0d | 354 | hlist_for_each_entry(host, chain, h_hash) { |
66697bfd SK |
355 | if (host->net != net) |
356 | continue; | |
67216b94 CL |
357 | if (!rpc_cmp_addr(nlm_addr(host), ni.sap)) |
358 | continue; | |
359 | ||
360 | /* Same address. Share an NSM handle if we already have one */ | |
361 | if (nsm == NULL) | |
362 | nsm = host->h_nsmhandle; | |
363 | ||
364 | if (host->h_proto != ni.protocol) | |
365 | continue; | |
366 | if (host->h_version != ni.version) | |
367 | continue; | |
79691836 | 368 | if (!rpc_cmp_addr(nlm_srcaddr(host), src_sap)) |
67216b94 CL |
369 | continue; |
370 | ||
371 | /* Move to head of hash chain. */ | |
372 | hlist_del(&host->h_hash); | |
373 | hlist_add_head(&host->h_hash, chain); | |
374 | ||
375 | nlm_get_host(host); | |
376 | dprintk("lockd: %s found host %s (%s)\n", | |
377 | __func__, host->h_name, host->h_addrbuf); | |
378 | goto out; | |
379 | } | |
380 | ||
381 | host = nlm_alloc_host(&ni, nsm); | |
382 | if (unlikely(host == NULL)) | |
383 | goto out; | |
384 | ||
79691836 CL |
385 | memcpy(nlm_srcaddr(host), src_sap, src_len); |
386 | host->h_srcaddrlen = src_len; | |
67216b94 | 387 | hlist_add_head(&host->h_hash, chain); |
caa4e76b | 388 | ln->nrhosts++; |
67216b94 CL |
389 | nrhosts++; |
390 | ||
391 | dprintk("lockd: %s created host %s (%s)\n", | |
392 | __func__, host->h_name, host->h_addrbuf); | |
393 | ||
394 | out: | |
395 | mutex_unlock(&nlm_host_mutex); | |
396 | return host; | |
397 | } | |
398 | ||
399 | /** | |
400 | * nlmsvc_release_host - release server nlm_host | |
401 | * @host: nlm_host to release | |
402 | * | |
403 | * Host is destroyed later in nlm_gc_host(). | |
404 | */ | |
405 | void nlmsvc_release_host(struct nlm_host *host) | |
406 | { | |
407 | if (host == NULL) | |
408 | return; | |
409 | ||
410 | dprintk("lockd: release server host %s\n", host->h_name); | |
411 | ||
a2d30a54 | 412 | WARN_ON_ONCE(!host->h_server); |
67216b94 | 413 | atomic_dec(&host->h_count); |
c585646d AB |
414 | } |
415 | ||
1da177e4 LT |
416 | /* |
417 | * Create the NLM RPC client for an NLM peer | |
418 | */ | |
419 | struct rpc_clnt * | |
420 | nlm_bind_host(struct nlm_host *host) | |
421 | { | |
422 | struct rpc_clnt *clnt; | |
1da177e4 | 423 | |
1df40b60 CL |
424 | dprintk("lockd: nlm_bind_host %s (%s)\n", |
425 | host->h_name, host->h_addrbuf); | |
1da177e4 LT |
426 | |
427 | /* Lock host handle */ | |
50467914 | 428 | mutex_lock(&host->h_mutex); |
1da177e4 LT |
429 | |
430 | /* If we've already created an RPC client, check whether | |
431 | * RPC rebind is required | |
1da177e4 LT |
432 | */ |
433 | if ((clnt = host->h_rpcclnt) != NULL) { | |
43118c29 | 434 | if (time_after_eq(jiffies, host->h_nextrebind)) { |
35f5a422 | 435 | rpc_force_rebind(clnt); |
1da177e4 | 436 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
1b333c54 | 437 | dprintk("lockd: next rebind in %lu jiffies\n", |
1da177e4 LT |
438 | host->h_nextrebind - jiffies); |
439 | } | |
440 | } else { | |
21051ba6 | 441 | unsigned long increment = nlmsvc_timeout; |
e1ec7892 CL |
442 | struct rpc_timeout timeparms = { |
443 | .to_initval = increment, | |
444 | .to_increment = increment, | |
445 | .to_maxval = increment * 6UL, | |
446 | .to_retries = 5U, | |
447 | }; | |
448 | struct rpc_create_args args = { | |
66697bfd | 449 | .net = host->net, |
e1ec7892 | 450 | .protocol = host->h_proto, |
b4ed58fd CL |
451 | .address = nlm_addr(host), |
452 | .addrsize = host->h_addrlen, | |
e1ec7892 CL |
453 | .timeout = &timeparms, |
454 | .servername = host->h_name, | |
455 | .program = &nlm_program, | |
456 | .version = host->h_version, | |
457 | .authflavor = RPC_AUTH_UNIX, | |
90bd17c8 | 458 | .flags = (RPC_CLNT_CREATE_NOPING | |
e1ec7892 CL |
459 | RPC_CLNT_CREATE_AUTOBIND), |
460 | }; | |
461 | ||
90bd17c8 JL |
462 | /* |
463 | * lockd retries server side blocks automatically so we want | |
464 | * those to be soft RPC calls. Client side calls need to be | |
465 | * hard RPC tasks. | |
466 | */ | |
467 | if (!host->h_server) | |
468 | args.flags |= RPC_CLNT_CREATE_HARDRTRY; | |
0cb2659b CL |
469 | if (host->h_noresvport) |
470 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; | |
8e35f8e7 TM |
471 | if (host->h_srcaddrlen) |
472 | args.saddress = nlm_srcaddr(host); | |
90bd17c8 | 473 | |
e1ec7892 CL |
474 | clnt = rpc_create(&args); |
475 | if (!IS_ERR(clnt)) | |
476 | host->h_rpcclnt = clnt; | |
477 | else { | |
478 | printk("lockd: couldn't create RPC handle for %s\n", host->h_name); | |
479 | clnt = NULL; | |
480 | } | |
1da177e4 LT |
481 | } |
482 | ||
50467914 | 483 | mutex_unlock(&host->h_mutex); |
1da177e4 | 484 | return clnt; |
1da177e4 LT |
485 | } |
486 | ||
487 | /* | |
488 | * Force a portmap lookup of the remote lockd port | |
489 | */ | |
490 | void | |
491 | nlm_rebind_host(struct nlm_host *host) | |
492 | { | |
493 | dprintk("lockd: rebind host %s\n", host->h_name); | |
494 | if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) { | |
35f5a422 | 495 | rpc_force_rebind(host->h_rpcclnt); |
1da177e4 LT |
496 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
497 | } | |
498 | } | |
499 | ||
500 | /* | |
501 | * Increment NLM host count | |
502 | */ | |
503 | struct nlm_host * nlm_get_host(struct nlm_host *host) | |
504 | { | |
505 | if (host) { | |
506 | dprintk("lockd: get host %s\n", host->h_name); | |
507 | atomic_inc(&host->h_count); | |
508 | host->h_expires = jiffies + NLM_HOST_EXPIRE; | |
509 | } | |
510 | return host; | |
511 | } | |
512 | ||
b10e30f6 BF |
513 | static struct nlm_host *next_host_state(struct hlist_head *cache, |
514 | struct nsm_handle *nsm, | |
515 | const struct nlm_reboot *info) | |
516 | { | |
80c30e8d | 517 | struct nlm_host *host; |
b10e30f6 | 518 | struct hlist_head *chain; |
b10e30f6 BF |
519 | |
520 | mutex_lock(&nlm_host_mutex); | |
b67bfe0d | 521 | for_each_host(host, chain, cache) { |
b10e30f6 BF |
522 | if (host->h_nsmhandle == nsm |
523 | && host->h_nsmstate != info->state) { | |
524 | host->h_nsmstate = info->state; | |
525 | host->h_state++; | |
526 | ||
527 | nlm_get_host(host); | |
80c30e8d CL |
528 | mutex_unlock(&nlm_host_mutex); |
529 | return host; | |
b10e30f6 BF |
530 | } |
531 | } | |
80c30e8d | 532 | |
b10e30f6 | 533 | mutex_unlock(&nlm_host_mutex); |
80c30e8d | 534 | return NULL; |
b10e30f6 BF |
535 | } |
536 | ||
7fefc9cb CL |
537 | /** |
538 | * nlm_host_rebooted - Release all resources held by rebooted host | |
0ad95472 | 539 | * @net: network namespace |
7fefc9cb CL |
540 | * @info: pointer to decoded results of NLM_SM_NOTIFY call |
541 | * | |
542 | * We were notified that the specified host has rebooted. Release | |
543 | * all resources held by that peer. | |
cf712c24 | 544 | */ |
0ad95472 | 545 | void nlm_host_rebooted(const struct net *net, const struct nlm_reboot *info) |
cf712c24 | 546 | { |
5c8dd29c | 547 | struct nsm_handle *nsm; |
0cea3276 | 548 | struct nlm_host *host; |
cf712c24 | 549 | |
0ad95472 | 550 | nsm = nsm_reboot_lookup(net, info); |
8c7378fd | 551 | if (unlikely(nsm == NULL)) |
db4e4c9a | 552 | return; |
5c8dd29c OK |
553 | |
554 | /* Mark all hosts tied to this NSM state as having rebooted. | |
555 | * We run the loop repeatedly, because we drop the host table | |
556 | * lock for this. | |
557 | * To avoid processing a host several times, we match the nsmstate. | |
558 | */ | |
d2df0484 | 559 | while ((host = next_host_state(nlm_server_hosts, nsm, info)) != NULL) { |
8ea6ecc8 | 560 | nlmsvc_free_host_resources(host); |
67216b94 | 561 | nlmsvc_release_host(host); |
cf712c24 | 562 | } |
8ea6ecc8 CL |
563 | while ((host = next_host_state(nlm_client_hosts, nsm, info)) != NULL) { |
564 | nlmclnt_recovery(host); | |
565 | nlmclnt_release_host(host); | |
566 | } | |
567 | ||
cdd30fa1 | 568 | nsm_release(nsm); |
cf712c24 OK |
569 | } |
570 | ||
d5850ff9 SK |
571 | static void nlm_complain_hosts(struct net *net) |
572 | { | |
573 | struct hlist_head *chain; | |
d5850ff9 SK |
574 | struct nlm_host *host; |
575 | ||
576 | if (net) { | |
577 | struct lockd_net *ln = net_generic(net, lockd_net_id); | |
578 | ||
579 | if (ln->nrhosts == 0) | |
580 | return; | |
581 | printk(KERN_WARNING "lockd: couldn't shutdown host module for net %p!\n", net); | |
582 | dprintk("lockd: %lu hosts left in net %p:\n", ln->nrhosts, net); | |
583 | } else { | |
584 | if (nrhosts == 0) | |
585 | return; | |
586 | printk(KERN_WARNING "lockd: couldn't shutdown host module!\n"); | |
587 | dprintk("lockd: %lu hosts left:\n", nrhosts); | |
588 | } | |
589 | ||
b67bfe0d | 590 | for_each_host(host, chain, nlm_server_hosts) { |
d5850ff9 SK |
591 | if (net && host->net != net) |
592 | continue; | |
593 | dprintk(" %s (cnt %d use %d exp %ld net %p)\n", | |
594 | host->h_name, atomic_read(&host->h_count), | |
595 | host->h_inuse, host->h_expires, host->net); | |
596 | } | |
597 | } | |
598 | ||
1da177e4 | 599 | void |
3b64739f | 600 | nlm_shutdown_hosts_net(struct net *net) |
1da177e4 | 601 | { |
0cea3276 | 602 | struct hlist_head *chain; |
1da177e4 | 603 | struct nlm_host *host; |
1da177e4 | 604 | |
353ab6e9 | 605 | mutex_lock(&nlm_host_mutex); |
1da177e4 LT |
606 | |
607 | /* First, make all hosts eligible for gc */ | |
e2edaa98 | 608 | dprintk("lockd: nuking all hosts in net %p...\n", net); |
b67bfe0d | 609 | for_each_host(host, chain, nlm_server_hosts) { |
3b64739f SK |
610 | if (net && host->net != net) |
611 | continue; | |
b1137468 BF |
612 | host->h_expires = jiffies - 1; |
613 | if (host->h_rpcclnt) { | |
614 | rpc_shutdown_client(host->h_rpcclnt); | |
615 | host->h_rpcclnt = NULL; | |
d801b861 | 616 | } |
1da177e4 LT |
617 | } |
618 | ||
619 | /* Then, perform a garbage collection pass */ | |
27adaddc | 620 | nlm_gc_hosts(net); |
353ab6e9 | 621 | mutex_unlock(&nlm_host_mutex); |
caa4e76b | 622 | |
d5850ff9 | 623 | nlm_complain_hosts(net); |
3b64739f SK |
624 | } |
625 | ||
626 | /* | |
627 | * Shut down the hosts module. | |
628 | * Note that this routine is called only at server shutdown time. | |
629 | */ | |
630 | void | |
631 | nlm_shutdown_hosts(void) | |
632 | { | |
e2edaa98 | 633 | dprintk("lockd: shutting down host module\n"); |
3b64739f | 634 | nlm_shutdown_hosts_net(NULL); |
1da177e4 LT |
635 | } |
636 | ||
637 | /* | |
638 | * Garbage collect any unused NLM hosts. | |
639 | * This GC combines reference counting for async operations with | |
640 | * mark & sweep for resources held by remote clients. | |
641 | */ | |
642 | static void | |
27adaddc | 643 | nlm_gc_hosts(struct net *net) |
1da177e4 | 644 | { |
0cea3276 | 645 | struct hlist_head *chain; |
b67bfe0d | 646 | struct hlist_node *next; |
0cea3276 | 647 | struct nlm_host *host; |
1da177e4 | 648 | |
27adaddc | 649 | dprintk("lockd: host garbage collection for net %p\n", net); |
b67bfe0d | 650 | for_each_host(host, chain, nlm_server_hosts) { |
27adaddc SK |
651 | if (net && host->net != net) |
652 | continue; | |
b1137468 | 653 | host->h_inuse = 0; |
27adaddc | 654 | } |
1da177e4 LT |
655 | |
656 | /* Mark all hosts that hold locks, blocks or shares */ | |
b26411f8 | 657 | nlmsvc_mark_resources(net); |
1da177e4 | 658 | |
b67bfe0d | 659 | for_each_host_safe(host, next, chain, nlm_server_hosts) { |
27adaddc SK |
660 | if (net && host->net != net) |
661 | continue; | |
b1137468 BF |
662 | if (atomic_read(&host->h_count) || host->h_inuse |
663 | || time_before(jiffies, host->h_expires)) { | |
664 | dprintk("nlm_gc_hosts skipping %s " | |
27adaddc | 665 | "(cnt %d use %d exp %ld net %p)\n", |
b1137468 | 666 | host->h_name, atomic_read(&host->h_count), |
27adaddc | 667 | host->h_inuse, host->h_expires, host->net); |
b1137468 | 668 | continue; |
1da177e4 | 669 | } |
723bb5b5 | 670 | nlm_destroy_host_locked(host); |
1da177e4 LT |
671 | } |
672 | ||
3cf7fb07 SK |
673 | if (net) { |
674 | struct lockd_net *ln = net_generic(net, lockd_net_id); | |
675 | ||
676 | ln->next_gc = jiffies + NLM_HOST_COLLECT; | |
677 | } | |
1da177e4 | 678 | } |