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