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