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Commit | Line | Data |
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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> | |
18 | #include <linux/lockd/sm_inter.h> | |
353ab6e9 | 19 | #include <linux/mutex.h> |
1da177e4 | 20 | |
1b333c54 | 21 | #include <net/ipv6.h> |
1da177e4 LT |
22 | |
23 | #define NLMDBG_FACILITY NLMDBG_HOSTCACHE | |
1da177e4 | 24 | #define NLM_HOST_NRHASH 32 |
1da177e4 | 25 | #define NLM_HOST_REBIND (60 * HZ) |
1447d25e N |
26 | #define NLM_HOST_EXPIRE (300 * HZ) |
27 | #define NLM_HOST_COLLECT (120 * HZ) | |
1da177e4 | 28 | |
0cea3276 | 29 | static struct hlist_head nlm_hosts[NLM_HOST_NRHASH]; |
1da177e4 LT |
30 | static unsigned long next_gc; |
31 | static int nrhosts; | |
353ab6e9 | 32 | static DEFINE_MUTEX(nlm_host_mutex); |
1da177e4 | 33 | |
1da177e4 | 34 | static void nlm_gc_hosts(void); |
e018040a CL |
35 | static struct nsm_handle *nsm_find(const struct sockaddr *sap, |
36 | const size_t salen, | |
bc48e4d6 CL |
37 | const char *hostname, |
38 | const size_t hostname_len, | |
39 | const int create); | |
1da177e4 | 40 | |
7f1ed18b CL |
41 | struct nlm_lookup_host_info { |
42 | const int server; /* search for server|client */ | |
88541c84 CL |
43 | const struct sockaddr *sap; /* address to search for */ |
44 | const size_t salen; /* it's length */ | |
7f1ed18b CL |
45 | const unsigned short protocol; /* transport to search for*/ |
46 | const u32 version; /* NLM version to search for */ | |
47 | const char *hostname; /* remote's hostname */ | |
48 | const size_t hostname_len; /* it's length */ | |
88541c84 | 49 | const struct sockaddr *src_sap; /* our address (optional) */ |
7f1ed18b CL |
50 | const size_t src_len; /* it's length */ |
51 | }; | |
52 | ||
ede2fea0 CL |
53 | /* |
54 | * Hash function must work well on big- and little-endian platforms | |
55 | */ | |
56 | static unsigned int __nlm_hash32(const __be32 n) | |
57 | { | |
58 | unsigned int hash = (__force u32)n ^ ((__force u32)n >> 16); | |
59 | return hash ^ (hash >> 8); | |
60 | } | |
61 | ||
62 | static unsigned int __nlm_hash_addr4(const struct sockaddr *sap) | |
63 | { | |
64 | const struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
65 | return __nlm_hash32(sin->sin_addr.s_addr); | |
66 | } | |
67 | ||
68 | static unsigned int __nlm_hash_addr6(const struct sockaddr *sap) | |
69 | { | |
70 | const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
71 | const struct in6_addr addr = sin6->sin6_addr; | |
72 | return __nlm_hash32(addr.s6_addr32[0]) ^ | |
73 | __nlm_hash32(addr.s6_addr32[1]) ^ | |
74 | __nlm_hash32(addr.s6_addr32[2]) ^ | |
75 | __nlm_hash32(addr.s6_addr32[3]); | |
76 | } | |
77 | ||
78 | static unsigned int nlm_hash_address(const struct sockaddr *sap) | |
79 | { | |
80 | unsigned int hash; | |
81 | ||
82 | switch (sap->sa_family) { | |
83 | case AF_INET: | |
84 | hash = __nlm_hash_addr4(sap); | |
85 | break; | |
86 | case AF_INET6: | |
87 | hash = __nlm_hash_addr6(sap); | |
88 | break; | |
89 | default: | |
90 | hash = 0; | |
91 | } | |
92 | return hash & (NLM_HOST_NRHASH - 1); | |
93 | } | |
94 | ||
396cb3d0 CL |
95 | static void nlm_clear_port(struct sockaddr *sap) |
96 | { | |
97 | switch (sap->sa_family) { | |
98 | case AF_INET: | |
99 | ((struct sockaddr_in *)sap)->sin_port = 0; | |
100 | break; | |
101 | case AF_INET6: | |
102 | ((struct sockaddr_in6 *)sap)->sin6_port = 0; | |
103 | break; | |
104 | } | |
105 | } | |
106 | ||
1b333c54 CL |
107 | static void nlm_display_address(const struct sockaddr *sap, |
108 | char *buf, const size_t len) | |
109 | { | |
110 | const struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
111 | const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
112 | ||
113 | switch (sap->sa_family) { | |
114 | case AF_UNSPEC: | |
115 | snprintf(buf, len, "unspecified"); | |
116 | break; | |
117 | case AF_INET: | |
118 | snprintf(buf, len, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr)); | |
119 | break; | |
120 | case AF_INET6: | |
121 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) | |
122 | snprintf(buf, len, NIPQUAD_FMT, | |
123 | NIPQUAD(sin6->sin6_addr.s6_addr32[3])); | |
124 | else | |
125 | snprintf(buf, len, NIP6_FMT, NIP6(sin6->sin6_addr)); | |
126 | break; | |
127 | default: | |
128 | snprintf(buf, len, "unsupported address family"); | |
129 | break; | |
130 | } | |
131 | } | |
132 | ||
1da177e4 LT |
133 | /* |
134 | * Common host lookup routine for server & client | |
135 | */ | |
7f1ed18b | 136 | static struct nlm_host *nlm_lookup_host(struct nlm_lookup_host_info *ni) |
1da177e4 | 137 | { |
0cea3276 OK |
138 | struct hlist_head *chain; |
139 | struct hlist_node *pos; | |
140 | struct nlm_host *host; | |
8dead0db | 141 | struct nsm_handle *nsm = NULL; |
1da177e4 | 142 | |
353ab6e9 | 143 | mutex_lock(&nlm_host_mutex); |
1da177e4 LT |
144 | |
145 | if (time_after_eq(jiffies, next_gc)) | |
146 | nlm_gc_hosts(); | |
147 | ||
8dead0db OK |
148 | /* We may keep several nlm_host objects for a peer, because each |
149 | * nlm_host is identified by | |
150 | * (address, protocol, version, server/client) | |
151 | * We could probably simplify this a little by putting all those | |
152 | * different NLM rpc_clients into one single nlm_host object. | |
153 | * This would allow us to have one nlm_host per address. | |
154 | */ | |
88541c84 | 155 | chain = &nlm_hosts[nlm_hash_address(ni->sap)]; |
0cea3276 | 156 | hlist_for_each_entry(host, pos, chain, h_hash) { |
88541c84 | 157 | if (!nlm_cmp_addr(nlm_addr(host), ni->sap)) |
8dead0db OK |
158 | continue; |
159 | ||
160 | /* See if we have an NSM handle for this client */ | |
6b54dae2 N |
161 | if (!nsm) |
162 | nsm = host->h_nsmhandle; | |
8dead0db | 163 | |
7f1ed18b | 164 | if (host->h_proto != ni->protocol) |
1da177e4 | 165 | continue; |
7f1ed18b | 166 | if (host->h_version != ni->version) |
1da177e4 | 167 | continue; |
7f1ed18b | 168 | if (host->h_server != ni->server) |
1da177e4 | 169 | continue; |
88541c84 | 170 | if (!nlm_cmp_addr(nlm_srcaddr(host), ni->src_sap)) |
c98451bd | 171 | continue; |
1da177e4 | 172 | |
0cea3276 OK |
173 | /* Move to head of hash chain. */ |
174 | hlist_del(&host->h_hash); | |
175 | hlist_add_head(&host->h_hash, chain); | |
176 | ||
f0737a39 | 177 | nlm_get_host(host); |
1b333c54 CL |
178 | dprintk("lockd: nlm_lookup_host found host %s (%s)\n", |
179 | host->h_name, host->h_addrbuf); | |
f0737a39 | 180 | goto out; |
1da177e4 LT |
181 | } |
182 | ||
c2526f42 CL |
183 | /* |
184 | * The host wasn't in our hash table. If we don't | |
185 | * have an NSM handle for it yet, create one. | |
8dead0db | 186 | */ |
c2526f42 CL |
187 | if (nsm) |
188 | atomic_inc(&nsm->sm_count); | |
189 | else { | |
190 | host = NULL; | |
88541c84 | 191 | nsm = nsm_find(ni->sap, ni->salen, |
7f1ed18b | 192 | ni->hostname, ni->hostname_len, 1); |
1b333c54 CL |
193 | if (!nsm) { |
194 | dprintk("lockd: nlm_lookup_host failed; " | |
195 | "no nsm handle\n"); | |
c2526f42 | 196 | goto out; |
1b333c54 | 197 | } |
c2526f42 | 198 | } |
1da177e4 | 199 | |
f8314dc6 | 200 | host = kzalloc(sizeof(*host), GFP_KERNEL); |
8dead0db OK |
201 | if (!host) { |
202 | nsm_release(nsm); | |
1b333c54 | 203 | dprintk("lockd: nlm_lookup_host failed; no memory\n"); |
8dead0db OK |
204 | goto out; |
205 | } | |
206 | host->h_name = nsm->sm_name; | |
88541c84 CL |
207 | memcpy(nlm_addr(host), ni->sap, ni->salen); |
208 | host->h_addrlen = ni->salen; | |
b4ed58fd | 209 | nlm_clear_port(nlm_addr(host)); |
88541c84 | 210 | memcpy(nlm_srcaddr(host), ni->src_sap, ni->src_len); |
7f1ed18b CL |
211 | host->h_version = ni->version; |
212 | host->h_proto = ni->protocol; | |
1da177e4 | 213 | host->h_rpcclnt = NULL; |
50467914 | 214 | mutex_init(&host->h_mutex); |
1da177e4 LT |
215 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
216 | host->h_expires = jiffies + NLM_HOST_EXPIRE; | |
217 | atomic_set(&host->h_count, 1); | |
218 | init_waitqueue_head(&host->h_gracewait); | |
28df955a | 219 | init_rwsem(&host->h_rwsem); |
1da177e4 LT |
220 | host->h_state = 0; /* pseudo NSM state */ |
221 | host->h_nsmstate = 0; /* real NSM state */ | |
8dead0db | 222 | host->h_nsmhandle = nsm; |
7f1ed18b | 223 | host->h_server = ni->server; |
0cea3276 | 224 | hlist_add_head(&host->h_hash, chain); |
1da177e4 LT |
225 | INIT_LIST_HEAD(&host->h_lockowners); |
226 | spin_lock_init(&host->h_lock); | |
26bcbf96 CH |
227 | INIT_LIST_HEAD(&host->h_granted); |
228 | INIT_LIST_HEAD(&host->h_reclaim); | |
1da177e4 | 229 | |
1447d25e | 230 | nrhosts++; |
1b333c54 CL |
231 | |
232 | nlm_display_address((struct sockaddr *)&host->h_addr, | |
233 | host->h_addrbuf, sizeof(host->h_addrbuf)); | |
90151e6e CL |
234 | nlm_display_address((struct sockaddr *)&host->h_srcaddr, |
235 | host->h_srcaddrbuf, sizeof(host->h_srcaddrbuf)); | |
1b333c54 CL |
236 | |
237 | dprintk("lockd: nlm_lookup_host created host %s\n", | |
238 | host->h_name); | |
239 | ||
8dead0db | 240 | out: |
353ab6e9 | 241 | mutex_unlock(&nlm_host_mutex); |
1da177e4 LT |
242 | return host; |
243 | } | |
244 | ||
c53c1bb9 OK |
245 | /* |
246 | * Destroy a host | |
247 | */ | |
248 | static void | |
249 | nlm_destroy_host(struct nlm_host *host) | |
250 | { | |
251 | struct rpc_clnt *clnt; | |
252 | ||
253 | BUG_ON(!list_empty(&host->h_lockowners)); | |
254 | BUG_ON(atomic_read(&host->h_count)); | |
255 | ||
256 | /* | |
257 | * Release NSM handle and unmonitor host. | |
258 | */ | |
259 | nsm_unmonitor(host); | |
260 | ||
34f52e35 TM |
261 | clnt = host->h_rpcclnt; |
262 | if (clnt != NULL) | |
263 | rpc_shutdown_client(clnt); | |
c53c1bb9 OK |
264 | kfree(host); |
265 | } | |
266 | ||
c585646d AB |
267 | /* |
268 | * Find an NLM server handle in the cache. If there is none, create it. | |
269 | */ | |
eb18860e CL |
270 | struct nlm_host *nlmclnt_lookup_host(const struct sockaddr_in *sin, |
271 | int proto, u32 version, | |
272 | const char *hostname, | |
273 | unsigned int hostname_len) | |
c585646d | 274 | { |
88541c84 CL |
275 | const struct sockaddr source = { |
276 | .sa_family = AF_UNSPEC, | |
2860a022 | 277 | }; |
7f1ed18b CL |
278 | struct nlm_lookup_host_info ni = { |
279 | .server = 0, | |
88541c84 CL |
280 | .sap = (struct sockaddr *)sin, |
281 | .salen = sizeof(*sin), | |
7f1ed18b CL |
282 | .protocol = proto, |
283 | .version = version, | |
284 | .hostname = hostname, | |
285 | .hostname_len = hostname_len, | |
88541c84 CL |
286 | .src_sap = &source, |
287 | .src_len = sizeof(source), | |
7f1ed18b | 288 | }; |
c98451bd | 289 | |
7f1ed18b CL |
290 | dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__, |
291 | (hostname ? hostname : "<none>"), version, | |
292 | (proto == IPPROTO_UDP ? "udp" : "tcp")); | |
293 | ||
294 | return nlm_lookup_host(&ni); | |
c585646d AB |
295 | } |
296 | ||
297 | /* | |
298 | * Find an NLM client handle in the cache. If there is none, create it. | |
299 | */ | |
300 | struct nlm_host * | |
301 | nlmsvc_lookup_host(struct svc_rqst *rqstp, | |
48df020a | 302 | const char *hostname, unsigned int hostname_len) |
c585646d | 303 | { |
2860a022 CL |
304 | const struct sockaddr_in source = { |
305 | .sin_family = AF_INET, | |
306 | .sin_addr = rqstp->rq_daddr.addr, | |
307 | }; | |
7f1ed18b CL |
308 | struct nlm_lookup_host_info ni = { |
309 | .server = 1, | |
88541c84 CL |
310 | .sap = svc_addr(rqstp), |
311 | .salen = rqstp->rq_addrlen, | |
7f1ed18b CL |
312 | .protocol = rqstp->rq_prot, |
313 | .version = rqstp->rq_vers, | |
314 | .hostname = hostname, | |
315 | .hostname_len = hostname_len, | |
88541c84 CL |
316 | .src_sap = (struct sockaddr *)&source, |
317 | .src_len = sizeof(source), | |
7f1ed18b CL |
318 | }; |
319 | ||
320 | dprintk("lockd: %s(host='%*s', vers=%u, proto=%s)\n", __func__, | |
321 | (int)hostname_len, hostname, rqstp->rq_vers, | |
322 | (rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp")); | |
c98451bd | 323 | |
7f1ed18b | 324 | return nlm_lookup_host(&ni); |
c585646d AB |
325 | } |
326 | ||
1da177e4 LT |
327 | /* |
328 | * Create the NLM RPC client for an NLM peer | |
329 | */ | |
330 | struct rpc_clnt * | |
331 | nlm_bind_host(struct nlm_host *host) | |
332 | { | |
333 | struct rpc_clnt *clnt; | |
1da177e4 | 334 | |
1b333c54 | 335 | dprintk("lockd: nlm_bind_host %s (%s), my addr=%s\n", |
90151e6e | 336 | host->h_name, host->h_addrbuf, host->h_srcaddrbuf); |
1da177e4 LT |
337 | |
338 | /* Lock host handle */ | |
50467914 | 339 | mutex_lock(&host->h_mutex); |
1da177e4 LT |
340 | |
341 | /* If we've already created an RPC client, check whether | |
342 | * RPC rebind is required | |
1da177e4 LT |
343 | */ |
344 | if ((clnt = host->h_rpcclnt) != NULL) { | |
43118c29 | 345 | if (time_after_eq(jiffies, host->h_nextrebind)) { |
35f5a422 | 346 | rpc_force_rebind(clnt); |
1da177e4 | 347 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
1b333c54 | 348 | dprintk("lockd: next rebind in %lu jiffies\n", |
1da177e4 LT |
349 | host->h_nextrebind - jiffies); |
350 | } | |
351 | } else { | |
21051ba6 | 352 | unsigned long increment = nlmsvc_timeout; |
e1ec7892 CL |
353 | struct rpc_timeout timeparms = { |
354 | .to_initval = increment, | |
355 | .to_increment = increment, | |
356 | .to_maxval = increment * 6UL, | |
357 | .to_retries = 5U, | |
358 | }; | |
359 | struct rpc_create_args args = { | |
360 | .protocol = host->h_proto, | |
b4ed58fd CL |
361 | .address = nlm_addr(host), |
362 | .addrsize = host->h_addrlen, | |
90151e6e | 363 | .saddress = nlm_srcaddr(host), |
e1ec7892 CL |
364 | .timeout = &timeparms, |
365 | .servername = host->h_name, | |
366 | .program = &nlm_program, | |
367 | .version = host->h_version, | |
368 | .authflavor = RPC_AUTH_UNIX, | |
90bd17c8 | 369 | .flags = (RPC_CLNT_CREATE_NOPING | |
e1ec7892 CL |
370 | RPC_CLNT_CREATE_AUTOBIND), |
371 | }; | |
372 | ||
90bd17c8 JL |
373 | /* |
374 | * lockd retries server side blocks automatically so we want | |
375 | * those to be soft RPC calls. Client side calls need to be | |
376 | * hard RPC tasks. | |
377 | */ | |
378 | if (!host->h_server) | |
379 | args.flags |= RPC_CLNT_CREATE_HARDRTRY; | |
380 | ||
e1ec7892 CL |
381 | clnt = rpc_create(&args); |
382 | if (!IS_ERR(clnt)) | |
383 | host->h_rpcclnt = clnt; | |
384 | else { | |
385 | printk("lockd: couldn't create RPC handle for %s\n", host->h_name); | |
386 | clnt = NULL; | |
387 | } | |
1da177e4 LT |
388 | } |
389 | ||
50467914 | 390 | mutex_unlock(&host->h_mutex); |
1da177e4 | 391 | return clnt; |
1da177e4 LT |
392 | } |
393 | ||
394 | /* | |
395 | * Force a portmap lookup of the remote lockd port | |
396 | */ | |
397 | void | |
398 | nlm_rebind_host(struct nlm_host *host) | |
399 | { | |
400 | dprintk("lockd: rebind host %s\n", host->h_name); | |
401 | if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) { | |
35f5a422 | 402 | rpc_force_rebind(host->h_rpcclnt); |
1da177e4 LT |
403 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
404 | } | |
405 | } | |
406 | ||
407 | /* | |
408 | * Increment NLM host count | |
409 | */ | |
410 | struct nlm_host * nlm_get_host(struct nlm_host *host) | |
411 | { | |
412 | if (host) { | |
413 | dprintk("lockd: get host %s\n", host->h_name); | |
414 | atomic_inc(&host->h_count); | |
415 | host->h_expires = jiffies + NLM_HOST_EXPIRE; | |
416 | } | |
417 | return host; | |
418 | } | |
419 | ||
420 | /* | |
421 | * Release NLM host after use | |
422 | */ | |
423 | void nlm_release_host(struct nlm_host *host) | |
424 | { | |
425 | if (host != NULL) { | |
426 | dprintk("lockd: release host %s\n", host->h_name); | |
1da177e4 | 427 | BUG_ON(atomic_read(&host->h_count) < 0); |
4c060b53 TM |
428 | if (atomic_dec_and_test(&host->h_count)) { |
429 | BUG_ON(!list_empty(&host->h_lockowners)); | |
430 | BUG_ON(!list_empty(&host->h_granted)); | |
431 | BUG_ON(!list_empty(&host->h_reclaim)); | |
432 | } | |
1da177e4 LT |
433 | } |
434 | } | |
435 | ||
cf712c24 OK |
436 | /* |
437 | * We were notified that the host indicated by address &sin | |
438 | * has rebooted. | |
439 | * Release all resources held by that peer. | |
440 | */ | |
5c8dd29c | 441 | void nlm_host_rebooted(const struct sockaddr_in *sin, |
48df020a CL |
442 | const char *hostname, |
443 | unsigned int hostname_len, | |
5c8dd29c | 444 | u32 new_state) |
cf712c24 | 445 | { |
0cea3276 OK |
446 | struct hlist_head *chain; |
447 | struct hlist_node *pos; | |
5c8dd29c | 448 | struct nsm_handle *nsm; |
0cea3276 | 449 | struct nlm_host *host; |
cf712c24 | 450 | |
e018040a CL |
451 | nsm = nsm_find((struct sockaddr *)sin, sizeof(*sin), |
452 | hostname, hostname_len, 0); | |
1b333c54 CL |
453 | if (nsm == NULL) { |
454 | dprintk("lockd: never saw rebooted peer '%.*s' before\n", | |
455 | hostname_len, hostname); | |
db4e4c9a | 456 | return; |
1b333c54 CL |
457 | } |
458 | ||
459 | dprintk("lockd: nlm_host_rebooted(%.*s, %s)\n", | |
460 | hostname_len, hostname, nsm->sm_addrbuf); | |
db4e4c9a | 461 | |
5c8dd29c OK |
462 | /* When reclaiming locks on this peer, make sure that |
463 | * we set up a new notification */ | |
464 | nsm->sm_monitored = 0; | |
465 | ||
466 | /* Mark all hosts tied to this NSM state as having rebooted. | |
467 | * We run the loop repeatedly, because we drop the host table | |
468 | * lock for this. | |
469 | * To avoid processing a host several times, we match the nsmstate. | |
470 | */ | |
471 | again: mutex_lock(&nlm_host_mutex); | |
0cea3276 OK |
472 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
473 | hlist_for_each_entry(host, pos, chain, h_hash) { | |
5c8dd29c OK |
474 | if (host->h_nsmhandle == nsm |
475 | && host->h_nsmstate != new_state) { | |
476 | host->h_nsmstate = new_state; | |
477 | host->h_state++; | |
478 | ||
479 | nlm_get_host(host); | |
480 | mutex_unlock(&nlm_host_mutex); | |
481 | ||
482 | if (host->h_server) { | |
483 | /* We're server for this guy, just ditch | |
484 | * all the locks he held. */ | |
485 | nlmsvc_free_host_resources(host); | |
486 | } else { | |
487 | /* He's the server, initiate lock recovery. */ | |
488 | nlmclnt_recovery(host); | |
489 | } | |
490 | ||
491 | nlm_release_host(host); | |
492 | goto again; | |
493 | } | |
494 | } | |
cf712c24 | 495 | } |
5c8dd29c OK |
496 | |
497 | mutex_unlock(&nlm_host_mutex); | |
cf712c24 OK |
498 | } |
499 | ||
1da177e4 LT |
500 | /* |
501 | * Shut down the hosts module. | |
502 | * Note that this routine is called only at server shutdown time. | |
503 | */ | |
504 | void | |
505 | nlm_shutdown_hosts(void) | |
506 | { | |
0cea3276 OK |
507 | struct hlist_head *chain; |
508 | struct hlist_node *pos; | |
1da177e4 | 509 | struct nlm_host *host; |
1da177e4 LT |
510 | |
511 | dprintk("lockd: shutting down host module\n"); | |
353ab6e9 | 512 | mutex_lock(&nlm_host_mutex); |
1da177e4 LT |
513 | |
514 | /* First, make all hosts eligible for gc */ | |
515 | dprintk("lockd: nuking all hosts...\n"); | |
0cea3276 | 516 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
d801b861 | 517 | hlist_for_each_entry(host, pos, chain, h_hash) { |
1da177e4 | 518 | host->h_expires = jiffies - 1; |
d801b861 JL |
519 | if (host->h_rpcclnt) { |
520 | rpc_shutdown_client(host->h_rpcclnt); | |
521 | host->h_rpcclnt = NULL; | |
522 | } | |
523 | } | |
1da177e4 LT |
524 | } |
525 | ||
526 | /* Then, perform a garbage collection pass */ | |
527 | nlm_gc_hosts(); | |
353ab6e9 | 528 | mutex_unlock(&nlm_host_mutex); |
1da177e4 LT |
529 | |
530 | /* complain if any hosts are left */ | |
531 | if (nrhosts) { | |
532 | printk(KERN_WARNING "lockd: couldn't shutdown host module!\n"); | |
533 | dprintk("lockd: %d hosts left:\n", nrhosts); | |
0cea3276 OK |
534 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
535 | hlist_for_each_entry(host, pos, chain, h_hash) { | |
1da177e4 LT |
536 | dprintk(" %s (cnt %d use %d exp %ld)\n", |
537 | host->h_name, atomic_read(&host->h_count), | |
538 | host->h_inuse, host->h_expires); | |
539 | } | |
540 | } | |
541 | } | |
542 | } | |
543 | ||
544 | /* | |
545 | * Garbage collect any unused NLM hosts. | |
546 | * This GC combines reference counting for async operations with | |
547 | * mark & sweep for resources held by remote clients. | |
548 | */ | |
549 | static void | |
550 | nlm_gc_hosts(void) | |
551 | { | |
0cea3276 OK |
552 | struct hlist_head *chain; |
553 | struct hlist_node *pos, *next; | |
554 | struct nlm_host *host; | |
1da177e4 LT |
555 | |
556 | dprintk("lockd: host garbage collection\n"); | |
0cea3276 OK |
557 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
558 | hlist_for_each_entry(host, pos, chain, h_hash) | |
1da177e4 LT |
559 | host->h_inuse = 0; |
560 | } | |
561 | ||
562 | /* Mark all hosts that hold locks, blocks or shares */ | |
563 | nlmsvc_mark_resources(); | |
564 | ||
0cea3276 OK |
565 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
566 | hlist_for_each_entry_safe(host, pos, next, chain, h_hash) { | |
1da177e4 LT |
567 | if (atomic_read(&host->h_count) || host->h_inuse |
568 | || time_before(jiffies, host->h_expires)) { | |
569 | dprintk("nlm_gc_hosts skipping %s (cnt %d use %d exp %ld)\n", | |
570 | host->h_name, atomic_read(&host->h_count), | |
571 | host->h_inuse, host->h_expires); | |
1da177e4 LT |
572 | continue; |
573 | } | |
574 | dprintk("lockd: delete host %s\n", host->h_name); | |
0cea3276 | 575 | hlist_del_init(&host->h_hash); |
977faf39 | 576 | |
c53c1bb9 | 577 | nlm_destroy_host(host); |
1da177e4 LT |
578 | nrhosts--; |
579 | } | |
580 | } | |
581 | ||
582 | next_gc = jiffies + NLM_HOST_COLLECT; | |
583 | } | |
584 | ||
8dead0db OK |
585 | |
586 | /* | |
587 | * Manage NSM handles | |
588 | */ | |
589 | static LIST_HEAD(nsm_handles); | |
d8421202 | 590 | static DEFINE_SPINLOCK(nsm_lock); |
8dead0db | 591 | |
e018040a CL |
592 | static struct nsm_handle *nsm_find(const struct sockaddr *sap, |
593 | const size_t salen, | |
bc48e4d6 CL |
594 | const char *hostname, |
595 | const size_t hostname_len, | |
596 | const int create) | |
8dead0db OK |
597 | { |
598 | struct nsm_handle *nsm = NULL; | |
a95e56e7 | 599 | struct nsm_handle *pos; |
8dead0db | 600 | |
e018040a | 601 | if (!sap) |
8dead0db OK |
602 | return NULL; |
603 | ||
604 | if (hostname && memchr(hostname, '/', hostname_len) != NULL) { | |
605 | if (printk_ratelimit()) { | |
606 | printk(KERN_WARNING "Invalid hostname \"%.*s\" " | |
607 | "in NFS lock request\n", | |
bc48e4d6 | 608 | (int)hostname_len, hostname); |
8dead0db OK |
609 | } |
610 | return NULL; | |
611 | } | |
612 | ||
d8421202 BF |
613 | retry: |
614 | spin_lock(&nsm_lock); | |
a95e56e7 | 615 | list_for_each_entry(pos, &nsm_handles, sm_link) { |
8dead0db | 616 | |
abd1f500 | 617 | if (hostname && nsm_use_hostnames) { |
a95e56e7 BF |
618 | if (strlen(pos->sm_name) != hostname_len |
619 | || memcmp(pos->sm_name, hostname, hostname_len)) | |
abd1f500 | 620 | continue; |
e018040a | 621 | } else if (!nlm_cmp_addr(nsm_addr(pos), sap)) |
8dead0db | 622 | continue; |
a95e56e7 | 623 | atomic_inc(&pos->sm_count); |
d8421202 | 624 | kfree(nsm); |
a95e56e7 | 625 | nsm = pos; |
d8421202 | 626 | goto found; |
8dead0db | 627 | } |
d8421202 BF |
628 | if (nsm) { |
629 | list_add(&nsm->sm_link, &nsm_handles); | |
630 | goto found; | |
8dead0db | 631 | } |
d8421202 BF |
632 | spin_unlock(&nsm_lock); |
633 | ||
634 | if (!create) | |
635 | return NULL; | |
8dead0db OK |
636 | |
637 | nsm = kzalloc(sizeof(*nsm) + hostname_len + 1, GFP_KERNEL); | |
a95e56e7 | 638 | if (nsm == NULL) |
d8421202 BF |
639 | return NULL; |
640 | ||
e018040a CL |
641 | memcpy(nsm_addr(nsm), sap, salen); |
642 | nsm->sm_addrlen = salen; | |
a95e56e7 BF |
643 | nsm->sm_name = (char *) (nsm + 1); |
644 | memcpy(nsm->sm_name, hostname, hostname_len); | |
645 | nsm->sm_name[hostname_len] = '\0'; | |
1b333c54 CL |
646 | nlm_display_address((struct sockaddr *)&nsm->sm_addr, |
647 | nsm->sm_addrbuf, sizeof(nsm->sm_addrbuf)); | |
a95e56e7 | 648 | atomic_set(&nsm->sm_count, 1); |
d8421202 | 649 | goto retry; |
a95e56e7 | 650 | |
d8421202 BF |
651 | found: |
652 | spin_unlock(&nsm_lock); | |
8dead0db OK |
653 | return nsm; |
654 | } | |
655 | ||
8dead0db OK |
656 | /* |
657 | * Release an NSM handle | |
658 | */ | |
659 | void | |
660 | nsm_release(struct nsm_handle *nsm) | |
661 | { | |
662 | if (!nsm) | |
663 | return; | |
d8421202 | 664 | if (atomic_dec_and_lock(&nsm->sm_count, &nsm_lock)) { |
164f98ad | 665 | list_del(&nsm->sm_link); |
d8421202 | 666 | spin_unlock(&nsm_lock); |
164f98ad | 667 | kfree(nsm); |
8dead0db OK |
668 | } |
669 | } |