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 | |
1b333c54 | 20 | #include <net/ipv6.h> |
1da177e4 LT |
21 | |
22 | #define NLMDBG_FACILITY NLMDBG_HOSTCACHE | |
1da177e4 | 23 | #define NLM_HOST_NRHASH 32 |
1da177e4 | 24 | #define NLM_HOST_REBIND (60 * HZ) |
1447d25e N |
25 | #define NLM_HOST_EXPIRE (300 * HZ) |
26 | #define NLM_HOST_COLLECT (120 * HZ) | |
1da177e4 | 27 | |
d2df0484 | 28 | static struct hlist_head nlm_server_hosts[NLM_HOST_NRHASH]; |
8ea6ecc8 | 29 | static struct hlist_head nlm_client_hosts[NLM_HOST_NRHASH]; |
b1137468 BF |
30 | |
31 | #define for_each_host(host, pos, chain, table) \ | |
32 | for ((chain) = (table); \ | |
33 | (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \ | |
34 | hlist_for_each_entry((host), (pos), (chain), h_hash) | |
35 | ||
36 | #define for_each_host_safe(host, pos, next, chain, table) \ | |
37 | for ((chain) = (table); \ | |
38 | (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \ | |
39 | hlist_for_each_entry_safe((host), (pos), (next), \ | |
40 | (chain), h_hash) | |
41 | ||
1da177e4 | 42 | static unsigned long next_gc; |
fcc072c7 | 43 | static unsigned long nrhosts; |
353ab6e9 | 44 | static DEFINE_MUTEX(nlm_host_mutex); |
1da177e4 | 45 | |
1da177e4 | 46 | static void nlm_gc_hosts(void); |
1da177e4 | 47 | |
7f1ed18b CL |
48 | struct nlm_lookup_host_info { |
49 | const int server; /* search for server|client */ | |
88541c84 CL |
50 | const struct sockaddr *sap; /* address to search for */ |
51 | const size_t salen; /* it's length */ | |
7f1ed18b CL |
52 | const unsigned short protocol; /* transport to search for*/ |
53 | const u32 version; /* NLM version to search for */ | |
54 | const char *hostname; /* remote's hostname */ | |
55 | const size_t hostname_len; /* it's length */ | |
0cb2659b | 56 | const int noresvport; /* use non-priv port */ |
7f1ed18b CL |
57 | }; |
58 | ||
ede2fea0 CL |
59 | /* |
60 | * Hash function must work well on big- and little-endian platforms | |
61 | */ | |
62 | static unsigned int __nlm_hash32(const __be32 n) | |
63 | { | |
64 | unsigned int hash = (__force u32)n ^ ((__force u32)n >> 16); | |
65 | return hash ^ (hash >> 8); | |
66 | } | |
67 | ||
68 | static unsigned int __nlm_hash_addr4(const struct sockaddr *sap) | |
69 | { | |
70 | const struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
71 | return __nlm_hash32(sin->sin_addr.s_addr); | |
72 | } | |
73 | ||
74 | static unsigned int __nlm_hash_addr6(const struct sockaddr *sap) | |
75 | { | |
76 | const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
77 | const struct in6_addr addr = sin6->sin6_addr; | |
78 | return __nlm_hash32(addr.s6_addr32[0]) ^ | |
79 | __nlm_hash32(addr.s6_addr32[1]) ^ | |
80 | __nlm_hash32(addr.s6_addr32[2]) ^ | |
81 | __nlm_hash32(addr.s6_addr32[3]); | |
82 | } | |
83 | ||
84 | static unsigned int nlm_hash_address(const struct sockaddr *sap) | |
85 | { | |
86 | unsigned int hash; | |
87 | ||
88 | switch (sap->sa_family) { | |
89 | case AF_INET: | |
90 | hash = __nlm_hash_addr4(sap); | |
91 | break; | |
92 | case AF_INET6: | |
93 | hash = __nlm_hash_addr6(sap); | |
94 | break; | |
95 | default: | |
96 | hash = 0; | |
97 | } | |
98 | return hash & (NLM_HOST_NRHASH - 1); | |
99 | } | |
100 | ||
a7952f40 CL |
101 | /* |
102 | * Allocate and initialize an nlm_host. Common to both client and server. | |
103 | */ | |
104 | static struct nlm_host *nlm_alloc_host(struct nlm_lookup_host_info *ni, | |
105 | struct nsm_handle *nsm) | |
106 | { | |
107 | struct nlm_host *host = NULL; | |
108 | unsigned long now = jiffies; | |
109 | ||
110 | if (nsm != NULL) | |
111 | atomic_inc(&nsm->sm_count); | |
112 | else { | |
113 | host = NULL; | |
114 | nsm = nsm_get_handle(ni->sap, ni->salen, | |
115 | ni->hostname, ni->hostname_len); | |
116 | if (unlikely(nsm == NULL)) { | |
117 | dprintk("lockd: %s failed; no nsm handle\n", | |
118 | __func__); | |
119 | goto out; | |
120 | } | |
121 | } | |
122 | ||
123 | host = kmalloc(sizeof(*host), GFP_KERNEL); | |
124 | if (unlikely(host == NULL)) { | |
125 | dprintk("lockd: %s failed; no memory\n", __func__); | |
126 | nsm_release(nsm); | |
127 | goto out; | |
128 | } | |
129 | ||
130 | memcpy(nlm_addr(host), ni->sap, ni->salen); | |
131 | host->h_addrlen = ni->salen; | |
132 | rpc_set_port(nlm_addr(host), 0); | |
133 | host->h_srcaddrlen = 0; | |
134 | ||
135 | host->h_rpcclnt = NULL; | |
136 | host->h_name = nsm->sm_name; | |
137 | host->h_version = ni->version; | |
138 | host->h_proto = ni->protocol; | |
139 | host->h_reclaiming = 0; | |
140 | host->h_server = ni->server; | |
141 | host->h_noresvport = ni->noresvport; | |
142 | host->h_inuse = 0; | |
143 | init_waitqueue_head(&host->h_gracewait); | |
144 | init_rwsem(&host->h_rwsem); | |
145 | host->h_state = 0; | |
146 | host->h_nsmstate = 0; | |
147 | host->h_pidcount = 0; | |
148 | atomic_set(&host->h_count, 1); | |
149 | mutex_init(&host->h_mutex); | |
150 | host->h_nextrebind = now + NLM_HOST_REBIND; | |
151 | host->h_expires = now + NLM_HOST_EXPIRE; | |
152 | INIT_LIST_HEAD(&host->h_lockowners); | |
153 | spin_lock_init(&host->h_lock); | |
154 | INIT_LIST_HEAD(&host->h_granted); | |
155 | INIT_LIST_HEAD(&host->h_reclaim); | |
156 | host->h_nsmhandle = nsm; | |
157 | host->h_addrbuf = nsm->sm_addrbuf; | |
158 | ||
159 | out: | |
160 | return host; | |
161 | } | |
162 | ||
c53c1bb9 | 163 | /* |
723bb5b5 CL |
164 | * Destroy an nlm_host and free associated resources |
165 | * | |
166 | * Caller must hold nlm_host_mutex. | |
c53c1bb9 | 167 | */ |
723bb5b5 | 168 | static void nlm_destroy_host_locked(struct nlm_host *host) |
c53c1bb9 OK |
169 | { |
170 | struct rpc_clnt *clnt; | |
171 | ||
723bb5b5 CL |
172 | dprintk("lockd: destroy host %s\n", host->h_name); |
173 | ||
c53c1bb9 OK |
174 | BUG_ON(!list_empty(&host->h_lockowners)); |
175 | BUG_ON(atomic_read(&host->h_count)); | |
176 | ||
723bb5b5 CL |
177 | hlist_del_init(&host->h_hash); |
178 | ||
c53c1bb9 | 179 | nsm_unmonitor(host); |
c8c23c42 | 180 | nsm_release(host->h_nsmhandle); |
c53c1bb9 | 181 | |
34f52e35 TM |
182 | clnt = host->h_rpcclnt; |
183 | if (clnt != NULL) | |
184 | rpc_shutdown_client(clnt); | |
c53c1bb9 | 185 | kfree(host); |
723bb5b5 CL |
186 | |
187 | nrhosts--; | |
c53c1bb9 OK |
188 | } |
189 | ||
d7d20440 CL |
190 | /** |
191 | * nlmclnt_lookup_host - Find an NLM host handle matching a remote server | |
192 | * @sap: network address of server | |
193 | * @salen: length of server address | |
194 | * @protocol: transport protocol to use | |
195 | * @version: NLM protocol version | |
196 | * @hostname: '\0'-terminated hostname of server | |
0cb2659b | 197 | * @noresvport: 1 if non-privileged port should be used |
d7d20440 CL |
198 | * |
199 | * Returns an nlm_host structure that matches the passed-in | |
200 | * [server address, transport protocol, NLM version, server hostname]. | |
201 | * If one doesn't already exist in the host cache, a new handle is | |
202 | * created and returned. | |
c585646d | 203 | */ |
d7d20440 CL |
204 | struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap, |
205 | const size_t salen, | |
206 | const unsigned short protocol, | |
0cb2659b CL |
207 | const u32 version, |
208 | const char *hostname, | |
209 | int noresvport) | |
c585646d | 210 | { |
7f1ed18b CL |
211 | struct nlm_lookup_host_info ni = { |
212 | .server = 0, | |
d7d20440 CL |
213 | .sap = sap, |
214 | .salen = salen, | |
215 | .protocol = protocol, | |
7f1ed18b CL |
216 | .version = version, |
217 | .hostname = hostname, | |
d7d20440 | 218 | .hostname_len = strlen(hostname), |
0cb2659b | 219 | .noresvport = noresvport, |
7f1ed18b | 220 | }; |
8ea6ecc8 CL |
221 | struct hlist_head *chain; |
222 | struct hlist_node *pos; | |
223 | struct nlm_host *host; | |
224 | struct nsm_handle *nsm = NULL; | |
c98451bd | 225 | |
7f1ed18b CL |
226 | dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__, |
227 | (hostname ? hostname : "<none>"), version, | |
d7d20440 | 228 | (protocol == IPPROTO_UDP ? "udp" : "tcp")); |
7f1ed18b | 229 | |
8ea6ecc8 CL |
230 | mutex_lock(&nlm_host_mutex); |
231 | ||
232 | chain = &nlm_client_hosts[nlm_hash_address(sap)]; | |
233 | hlist_for_each_entry(host, pos, chain, h_hash) { | |
234 | if (!rpc_cmp_addr(nlm_addr(host), sap)) | |
235 | continue; | |
236 | ||
237 | /* Same address. Share an NSM handle if we already have one */ | |
238 | if (nsm == NULL) | |
239 | nsm = host->h_nsmhandle; | |
240 | ||
241 | if (host->h_proto != protocol) | |
242 | continue; | |
243 | if (host->h_version != version) | |
244 | continue; | |
245 | ||
246 | nlm_get_host(host); | |
247 | dprintk("lockd: %s found host %s (%s)\n", __func__, | |
248 | host->h_name, host->h_addrbuf); | |
249 | goto out; | |
250 | } | |
251 | ||
252 | host = nlm_alloc_host(&ni, nsm); | |
253 | if (unlikely(host == NULL)) | |
254 | goto out; | |
255 | ||
256 | hlist_add_head(&host->h_hash, chain); | |
257 | nrhosts++; | |
258 | ||
259 | dprintk("lockd: %s created host %s (%s)\n", __func__, | |
260 | host->h_name, host->h_addrbuf); | |
261 | ||
262 | out: | |
263 | mutex_unlock(&nlm_host_mutex); | |
264 | return host; | |
265 | } | |
266 | ||
267 | /** | |
268 | * nlmclnt_release_host - release client nlm_host | |
269 | * @host: nlm_host to release | |
270 | * | |
271 | */ | |
272 | void nlmclnt_release_host(struct nlm_host *host) | |
273 | { | |
274 | if (host == NULL) | |
275 | return; | |
276 | ||
277 | dprintk("lockd: release client host %s\n", host->h_name); | |
278 | ||
279 | BUG_ON(atomic_read(&host->h_count) < 0); | |
280 | BUG_ON(host->h_server); | |
281 | ||
282 | if (atomic_dec_and_test(&host->h_count)) { | |
283 | BUG_ON(!list_empty(&host->h_lockowners)); | |
284 | BUG_ON(!list_empty(&host->h_granted)); | |
285 | BUG_ON(!list_empty(&host->h_reclaim)); | |
286 | ||
287 | mutex_lock(&nlm_host_mutex); | |
288 | nlm_destroy_host_locked(host); | |
289 | mutex_unlock(&nlm_host_mutex); | |
290 | } | |
c585646d AB |
291 | } |
292 | ||
6bfbe8af CL |
293 | /** |
294 | * nlmsvc_lookup_host - Find an NLM host handle matching a remote client | |
295 | * @rqstp: incoming NLM request | |
296 | * @hostname: name of client host | |
297 | * @hostname_len: length of client hostname | |
298 | * | |
299 | * Returns an nlm_host structure that matches the [client address, | |
300 | * transport protocol, NLM version, client hostname] of the passed-in | |
301 | * NLM request. If one doesn't already exist in the host cache, a | |
302 | * new handle is created and returned. | |
303 | * | |
304 | * Before possibly creating a new nlm_host, construct a sockaddr | |
305 | * for a specific source address in case the local system has | |
306 | * multiple network addresses. The family of the address in | |
307 | * rq_daddr is guaranteed to be the same as the family of the | |
308 | * address in rq_addr, so it's safe to use the same family for | |
309 | * the source address. | |
c585646d | 310 | */ |
6bfbe8af CL |
311 | struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp, |
312 | const char *hostname, | |
313 | const size_t hostname_len) | |
c585646d | 314 | { |
67216b94 CL |
315 | struct hlist_head *chain; |
316 | struct hlist_node *pos; | |
317 | struct nlm_host *host = NULL; | |
318 | struct nsm_handle *nsm = NULL; | |
849a1cf1 MJ |
319 | struct sockaddr *src_sap = svc_daddr(rqstp); |
320 | size_t src_len = rqstp->rq_daddrlen; | |
7f1ed18b CL |
321 | struct nlm_lookup_host_info ni = { |
322 | .server = 1, | |
88541c84 CL |
323 | .sap = svc_addr(rqstp), |
324 | .salen = rqstp->rq_addrlen, | |
7f1ed18b CL |
325 | .protocol = rqstp->rq_prot, |
326 | .version = rqstp->rq_vers, | |
327 | .hostname = hostname, | |
328 | .hostname_len = hostname_len, | |
7f1ed18b CL |
329 | }; |
330 | ||
331 | dprintk("lockd: %s(host='%*s', vers=%u, proto=%s)\n", __func__, | |
332 | (int)hostname_len, hostname, rqstp->rq_vers, | |
333 | (rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp")); | |
c98451bd | 334 | |
67216b94 CL |
335 | mutex_lock(&nlm_host_mutex); |
336 | ||
67216b94 CL |
337 | if (time_after_eq(jiffies, next_gc)) |
338 | nlm_gc_hosts(); | |
339 | ||
d2df0484 | 340 | chain = &nlm_server_hosts[nlm_hash_address(ni.sap)]; |
67216b94 CL |
341 | hlist_for_each_entry(host, pos, chain, h_hash) { |
342 | if (!rpc_cmp_addr(nlm_addr(host), ni.sap)) | |
343 | continue; | |
344 | ||
345 | /* Same address. Share an NSM handle if we already have one */ | |
346 | if (nsm == NULL) | |
347 | nsm = host->h_nsmhandle; | |
348 | ||
349 | if (host->h_proto != ni.protocol) | |
350 | continue; | |
351 | if (host->h_version != ni.version) | |
352 | continue; | |
79691836 | 353 | if (!rpc_cmp_addr(nlm_srcaddr(host), src_sap)) |
67216b94 CL |
354 | continue; |
355 | ||
356 | /* Move to head of hash chain. */ | |
357 | hlist_del(&host->h_hash); | |
358 | hlist_add_head(&host->h_hash, chain); | |
359 | ||
360 | nlm_get_host(host); | |
361 | dprintk("lockd: %s found host %s (%s)\n", | |
362 | __func__, host->h_name, host->h_addrbuf); | |
363 | goto out; | |
364 | } | |
365 | ||
366 | host = nlm_alloc_host(&ni, nsm); | |
367 | if (unlikely(host == NULL)) | |
368 | goto out; | |
369 | ||
79691836 CL |
370 | memcpy(nlm_srcaddr(host), src_sap, src_len); |
371 | host->h_srcaddrlen = src_len; | |
67216b94 CL |
372 | hlist_add_head(&host->h_hash, chain); |
373 | nrhosts++; | |
374 | ||
375 | dprintk("lockd: %s created host %s (%s)\n", | |
376 | __func__, host->h_name, host->h_addrbuf); | |
377 | ||
378 | out: | |
379 | mutex_unlock(&nlm_host_mutex); | |
380 | return host; | |
381 | } | |
382 | ||
383 | /** | |
384 | * nlmsvc_release_host - release server nlm_host | |
385 | * @host: nlm_host to release | |
386 | * | |
387 | * Host is destroyed later in nlm_gc_host(). | |
388 | */ | |
389 | void nlmsvc_release_host(struct nlm_host *host) | |
390 | { | |
391 | if (host == NULL) | |
392 | return; | |
393 | ||
394 | dprintk("lockd: release server host %s\n", host->h_name); | |
395 | ||
396 | BUG_ON(atomic_read(&host->h_count) < 0); | |
397 | BUG_ON(!host->h_server); | |
398 | atomic_dec(&host->h_count); | |
c585646d AB |
399 | } |
400 | ||
1da177e4 LT |
401 | /* |
402 | * Create the NLM RPC client for an NLM peer | |
403 | */ | |
404 | struct rpc_clnt * | |
405 | nlm_bind_host(struct nlm_host *host) | |
406 | { | |
407 | struct rpc_clnt *clnt; | |
1da177e4 | 408 | |
1df40b60 CL |
409 | dprintk("lockd: nlm_bind_host %s (%s)\n", |
410 | host->h_name, host->h_addrbuf); | |
1da177e4 LT |
411 | |
412 | /* Lock host handle */ | |
50467914 | 413 | mutex_lock(&host->h_mutex); |
1da177e4 LT |
414 | |
415 | /* If we've already created an RPC client, check whether | |
416 | * RPC rebind is required | |
1da177e4 LT |
417 | */ |
418 | if ((clnt = host->h_rpcclnt) != NULL) { | |
43118c29 | 419 | if (time_after_eq(jiffies, host->h_nextrebind)) { |
35f5a422 | 420 | rpc_force_rebind(clnt); |
1da177e4 | 421 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
1b333c54 | 422 | dprintk("lockd: next rebind in %lu jiffies\n", |
1da177e4 LT |
423 | host->h_nextrebind - jiffies); |
424 | } | |
425 | } else { | |
21051ba6 | 426 | unsigned long increment = nlmsvc_timeout; |
e1ec7892 CL |
427 | struct rpc_timeout timeparms = { |
428 | .to_initval = increment, | |
429 | .to_increment = increment, | |
430 | .to_maxval = increment * 6UL, | |
431 | .to_retries = 5U, | |
432 | }; | |
433 | struct rpc_create_args args = { | |
c653ce3f | 434 | .net = &init_net, |
e1ec7892 | 435 | .protocol = host->h_proto, |
b4ed58fd CL |
436 | .address = nlm_addr(host), |
437 | .addrsize = host->h_addrlen, | |
e1ec7892 CL |
438 | .timeout = &timeparms, |
439 | .servername = host->h_name, | |
440 | .program = &nlm_program, | |
441 | .version = host->h_version, | |
442 | .authflavor = RPC_AUTH_UNIX, | |
90bd17c8 | 443 | .flags = (RPC_CLNT_CREATE_NOPING | |
e1ec7892 CL |
444 | RPC_CLNT_CREATE_AUTOBIND), |
445 | }; | |
446 | ||
90bd17c8 JL |
447 | /* |
448 | * lockd retries server side blocks automatically so we want | |
449 | * those to be soft RPC calls. Client side calls need to be | |
450 | * hard RPC tasks. | |
451 | */ | |
452 | if (!host->h_server) | |
453 | args.flags |= RPC_CLNT_CREATE_HARDRTRY; | |
0cb2659b CL |
454 | if (host->h_noresvport) |
455 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; | |
8e35f8e7 TM |
456 | if (host->h_srcaddrlen) |
457 | args.saddress = nlm_srcaddr(host); | |
90bd17c8 | 458 | |
e1ec7892 CL |
459 | clnt = rpc_create(&args); |
460 | if (!IS_ERR(clnt)) | |
461 | host->h_rpcclnt = clnt; | |
462 | else { | |
463 | printk("lockd: couldn't create RPC handle for %s\n", host->h_name); | |
464 | clnt = NULL; | |
465 | } | |
1da177e4 LT |
466 | } |
467 | ||
50467914 | 468 | mutex_unlock(&host->h_mutex); |
1da177e4 | 469 | return clnt; |
1da177e4 LT |
470 | } |
471 | ||
472 | /* | |
473 | * Force a portmap lookup of the remote lockd port | |
474 | */ | |
475 | void | |
476 | nlm_rebind_host(struct nlm_host *host) | |
477 | { | |
478 | dprintk("lockd: rebind host %s\n", host->h_name); | |
479 | if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) { | |
35f5a422 | 480 | rpc_force_rebind(host->h_rpcclnt); |
1da177e4 LT |
481 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
482 | } | |
483 | } | |
484 | ||
485 | /* | |
486 | * Increment NLM host count | |
487 | */ | |
488 | struct nlm_host * nlm_get_host(struct nlm_host *host) | |
489 | { | |
490 | if (host) { | |
491 | dprintk("lockd: get host %s\n", host->h_name); | |
492 | atomic_inc(&host->h_count); | |
493 | host->h_expires = jiffies + NLM_HOST_EXPIRE; | |
494 | } | |
495 | return host; | |
496 | } | |
497 | ||
b10e30f6 BF |
498 | static struct nlm_host *next_host_state(struct hlist_head *cache, |
499 | struct nsm_handle *nsm, | |
500 | const struct nlm_reboot *info) | |
501 | { | |
80c30e8d | 502 | struct nlm_host *host; |
b10e30f6 BF |
503 | struct hlist_head *chain; |
504 | struct hlist_node *pos; | |
505 | ||
506 | mutex_lock(&nlm_host_mutex); | |
507 | for_each_host(host, pos, chain, cache) { | |
508 | if (host->h_nsmhandle == nsm | |
509 | && host->h_nsmstate != info->state) { | |
510 | host->h_nsmstate = info->state; | |
511 | host->h_state++; | |
512 | ||
513 | nlm_get_host(host); | |
80c30e8d CL |
514 | mutex_unlock(&nlm_host_mutex); |
515 | return host; | |
b10e30f6 BF |
516 | } |
517 | } | |
80c30e8d | 518 | |
b10e30f6 | 519 | mutex_unlock(&nlm_host_mutex); |
80c30e8d | 520 | return NULL; |
b10e30f6 BF |
521 | } |
522 | ||
7fefc9cb CL |
523 | /** |
524 | * nlm_host_rebooted - Release all resources held by rebooted host | |
525 | * @info: pointer to decoded results of NLM_SM_NOTIFY call | |
526 | * | |
527 | * We were notified that the specified host has rebooted. Release | |
528 | * all resources held by that peer. | |
cf712c24 | 529 | */ |
7fefc9cb | 530 | void nlm_host_rebooted(const struct nlm_reboot *info) |
cf712c24 | 531 | { |
5c8dd29c | 532 | struct nsm_handle *nsm; |
0cea3276 | 533 | struct nlm_host *host; |
cf712c24 | 534 | |
8c7378fd CL |
535 | nsm = nsm_reboot_lookup(info); |
536 | if (unlikely(nsm == NULL)) | |
db4e4c9a | 537 | return; |
5c8dd29c OK |
538 | |
539 | /* Mark all hosts tied to this NSM state as having rebooted. | |
540 | * We run the loop repeatedly, because we drop the host table | |
541 | * lock for this. | |
542 | * To avoid processing a host several times, we match the nsmstate. | |
543 | */ | |
d2df0484 | 544 | while ((host = next_host_state(nlm_server_hosts, nsm, info)) != NULL) { |
8ea6ecc8 | 545 | nlmsvc_free_host_resources(host); |
67216b94 | 546 | nlmsvc_release_host(host); |
cf712c24 | 547 | } |
8ea6ecc8 CL |
548 | while ((host = next_host_state(nlm_client_hosts, nsm, info)) != NULL) { |
549 | nlmclnt_recovery(host); | |
550 | nlmclnt_release_host(host); | |
551 | } | |
552 | ||
cdd30fa1 | 553 | nsm_release(nsm); |
cf712c24 OK |
554 | } |
555 | ||
1da177e4 LT |
556 | /* |
557 | * Shut down the hosts module. | |
558 | * Note that this routine is called only at server shutdown time. | |
559 | */ | |
560 | void | |
561 | nlm_shutdown_hosts(void) | |
562 | { | |
0cea3276 OK |
563 | struct hlist_head *chain; |
564 | struct hlist_node *pos; | |
1da177e4 | 565 | struct nlm_host *host; |
1da177e4 LT |
566 | |
567 | dprintk("lockd: shutting down host module\n"); | |
353ab6e9 | 568 | mutex_lock(&nlm_host_mutex); |
1da177e4 LT |
569 | |
570 | /* First, make all hosts eligible for gc */ | |
571 | dprintk("lockd: nuking all hosts...\n"); | |
d2df0484 | 572 | for_each_host(host, pos, chain, nlm_server_hosts) { |
b1137468 BF |
573 | host->h_expires = jiffies - 1; |
574 | if (host->h_rpcclnt) { | |
575 | rpc_shutdown_client(host->h_rpcclnt); | |
576 | host->h_rpcclnt = NULL; | |
d801b861 | 577 | } |
1da177e4 LT |
578 | } |
579 | ||
580 | /* Then, perform a garbage collection pass */ | |
581 | nlm_gc_hosts(); | |
353ab6e9 | 582 | mutex_unlock(&nlm_host_mutex); |
1da177e4 LT |
583 | |
584 | /* complain if any hosts are left */ | |
fcc072c7 | 585 | if (nrhosts != 0) { |
1da177e4 | 586 | printk(KERN_WARNING "lockd: couldn't shutdown host module!\n"); |
fcc072c7 | 587 | dprintk("lockd: %lu hosts left:\n", nrhosts); |
d2df0484 | 588 | for_each_host(host, pos, chain, nlm_server_hosts) { |
b1137468 BF |
589 | dprintk(" %s (cnt %d use %d exp %ld)\n", |
590 | host->h_name, atomic_read(&host->h_count), | |
591 | host->h_inuse, host->h_expires); | |
1da177e4 LT |
592 | } |
593 | } | |
594 | } | |
595 | ||
596 | /* | |
597 | * Garbage collect any unused NLM hosts. | |
598 | * This GC combines reference counting for async operations with | |
599 | * mark & sweep for resources held by remote clients. | |
600 | */ | |
601 | static void | |
602 | nlm_gc_hosts(void) | |
603 | { | |
0cea3276 OK |
604 | struct hlist_head *chain; |
605 | struct hlist_node *pos, *next; | |
606 | struct nlm_host *host; | |
1da177e4 LT |
607 | |
608 | dprintk("lockd: host garbage collection\n"); | |
d2df0484 | 609 | for_each_host(host, pos, chain, nlm_server_hosts) |
b1137468 | 610 | host->h_inuse = 0; |
1da177e4 LT |
611 | |
612 | /* Mark all hosts that hold locks, blocks or shares */ | |
613 | nlmsvc_mark_resources(); | |
614 | ||
d2df0484 | 615 | for_each_host_safe(host, pos, next, chain, nlm_server_hosts) { |
b1137468 BF |
616 | if (atomic_read(&host->h_count) || host->h_inuse |
617 | || time_before(jiffies, host->h_expires)) { | |
618 | dprintk("nlm_gc_hosts skipping %s " | |
619 | "(cnt %d use %d exp %ld)\n", | |
620 | host->h_name, atomic_read(&host->h_count), | |
621 | host->h_inuse, host->h_expires); | |
622 | continue; | |
1da177e4 | 623 | } |
723bb5b5 | 624 | nlm_destroy_host_locked(host); |
1da177e4 LT |
625 | } |
626 | ||
627 | next_gc = jiffies + NLM_HOST_COLLECT; | |
628 | } |