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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 | |
5b095d98 | 125 | snprintf(buf, len, "%pI6", &sin6->sin6_addr); |
1b333c54 CL |
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 | ||
d7d20440 CL |
267 | /** |
268 | * nlmclnt_lookup_host - Find an NLM host handle matching a remote server | |
269 | * @sap: network address of server | |
270 | * @salen: length of server address | |
271 | * @protocol: transport protocol to use | |
272 | * @version: NLM protocol version | |
273 | * @hostname: '\0'-terminated hostname of server | |
274 | * | |
275 | * Returns an nlm_host structure that matches the passed-in | |
276 | * [server address, transport protocol, NLM version, server hostname]. | |
277 | * If one doesn't already exist in the host cache, a new handle is | |
278 | * created and returned. | |
c585646d | 279 | */ |
d7d20440 CL |
280 | struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap, |
281 | const size_t salen, | |
282 | const unsigned short protocol, | |
283 | const u32 version, const char *hostname) | |
c585646d | 284 | { |
88541c84 CL |
285 | const struct sockaddr source = { |
286 | .sa_family = AF_UNSPEC, | |
2860a022 | 287 | }; |
7f1ed18b CL |
288 | struct nlm_lookup_host_info ni = { |
289 | .server = 0, | |
d7d20440 CL |
290 | .sap = sap, |
291 | .salen = salen, | |
292 | .protocol = protocol, | |
7f1ed18b CL |
293 | .version = version, |
294 | .hostname = hostname, | |
d7d20440 | 295 | .hostname_len = strlen(hostname), |
88541c84 CL |
296 | .src_sap = &source, |
297 | .src_len = sizeof(source), | |
7f1ed18b | 298 | }; |
c98451bd | 299 | |
7f1ed18b CL |
300 | dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__, |
301 | (hostname ? hostname : "<none>"), version, | |
d7d20440 | 302 | (protocol == IPPROTO_UDP ? "udp" : "tcp")); |
7f1ed18b CL |
303 | |
304 | return nlm_lookup_host(&ni); | |
c585646d AB |
305 | } |
306 | ||
6bfbe8af CL |
307 | /** |
308 | * nlmsvc_lookup_host - Find an NLM host handle matching a remote client | |
309 | * @rqstp: incoming NLM request | |
310 | * @hostname: name of client host | |
311 | * @hostname_len: length of client hostname | |
312 | * | |
313 | * Returns an nlm_host structure that matches the [client address, | |
314 | * transport protocol, NLM version, client hostname] of the passed-in | |
315 | * NLM request. If one doesn't already exist in the host cache, a | |
316 | * new handle is created and returned. | |
317 | * | |
318 | * Before possibly creating a new nlm_host, construct a sockaddr | |
319 | * for a specific source address in case the local system has | |
320 | * multiple network addresses. The family of the address in | |
321 | * rq_daddr is guaranteed to be the same as the family of the | |
322 | * address in rq_addr, so it's safe to use the same family for | |
323 | * the source address. | |
c585646d | 324 | */ |
6bfbe8af CL |
325 | struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp, |
326 | const char *hostname, | |
327 | const size_t hostname_len) | |
c585646d | 328 | { |
6bfbe8af | 329 | struct sockaddr_in sin = { |
2860a022 | 330 | .sin_family = AF_INET, |
6bfbe8af CL |
331 | }; |
332 | struct sockaddr_in6 sin6 = { | |
333 | .sin6_family = AF_INET6, | |
2860a022 | 334 | }; |
7f1ed18b CL |
335 | struct nlm_lookup_host_info ni = { |
336 | .server = 1, | |
88541c84 CL |
337 | .sap = svc_addr(rqstp), |
338 | .salen = rqstp->rq_addrlen, | |
7f1ed18b CL |
339 | .protocol = rqstp->rq_prot, |
340 | .version = rqstp->rq_vers, | |
341 | .hostname = hostname, | |
342 | .hostname_len = hostname_len, | |
6bfbe8af | 343 | .src_len = rqstp->rq_addrlen, |
7f1ed18b CL |
344 | }; |
345 | ||
346 | dprintk("lockd: %s(host='%*s', vers=%u, proto=%s)\n", __func__, | |
347 | (int)hostname_len, hostname, rqstp->rq_vers, | |
348 | (rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp")); | |
c98451bd | 349 | |
6bfbe8af CL |
350 | switch (ni.sap->sa_family) { |
351 | case AF_INET: | |
352 | sin.sin_addr.s_addr = rqstp->rq_daddr.addr.s_addr; | |
353 | ni.src_sap = (struct sockaddr *)&sin; | |
354 | break; | |
355 | case AF_INET6: | |
356 | ipv6_addr_copy(&sin6.sin6_addr, &rqstp->rq_daddr.addr6); | |
357 | ni.src_sap = (struct sockaddr *)&sin6; | |
358 | break; | |
359 | default: | |
360 | return NULL; | |
361 | } | |
362 | ||
7f1ed18b | 363 | return nlm_lookup_host(&ni); |
c585646d AB |
364 | } |
365 | ||
1da177e4 LT |
366 | /* |
367 | * Create the NLM RPC client for an NLM peer | |
368 | */ | |
369 | struct rpc_clnt * | |
370 | nlm_bind_host(struct nlm_host *host) | |
371 | { | |
372 | struct rpc_clnt *clnt; | |
1da177e4 | 373 | |
1b333c54 | 374 | dprintk("lockd: nlm_bind_host %s (%s), my addr=%s\n", |
90151e6e | 375 | host->h_name, host->h_addrbuf, host->h_srcaddrbuf); |
1da177e4 LT |
376 | |
377 | /* Lock host handle */ | |
50467914 | 378 | mutex_lock(&host->h_mutex); |
1da177e4 LT |
379 | |
380 | /* If we've already created an RPC client, check whether | |
381 | * RPC rebind is required | |
1da177e4 LT |
382 | */ |
383 | if ((clnt = host->h_rpcclnt) != NULL) { | |
43118c29 | 384 | if (time_after_eq(jiffies, host->h_nextrebind)) { |
35f5a422 | 385 | rpc_force_rebind(clnt); |
1da177e4 | 386 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
1b333c54 | 387 | dprintk("lockd: next rebind in %lu jiffies\n", |
1da177e4 LT |
388 | host->h_nextrebind - jiffies); |
389 | } | |
390 | } else { | |
21051ba6 | 391 | unsigned long increment = nlmsvc_timeout; |
e1ec7892 CL |
392 | struct rpc_timeout timeparms = { |
393 | .to_initval = increment, | |
394 | .to_increment = increment, | |
395 | .to_maxval = increment * 6UL, | |
396 | .to_retries = 5U, | |
397 | }; | |
398 | struct rpc_create_args args = { | |
399 | .protocol = host->h_proto, | |
b4ed58fd CL |
400 | .address = nlm_addr(host), |
401 | .addrsize = host->h_addrlen, | |
90151e6e | 402 | .saddress = nlm_srcaddr(host), |
e1ec7892 CL |
403 | .timeout = &timeparms, |
404 | .servername = host->h_name, | |
405 | .program = &nlm_program, | |
406 | .version = host->h_version, | |
407 | .authflavor = RPC_AUTH_UNIX, | |
90bd17c8 | 408 | .flags = (RPC_CLNT_CREATE_NOPING | |
e1ec7892 CL |
409 | RPC_CLNT_CREATE_AUTOBIND), |
410 | }; | |
411 | ||
90bd17c8 JL |
412 | /* |
413 | * lockd retries server side blocks automatically so we want | |
414 | * those to be soft RPC calls. Client side calls need to be | |
415 | * hard RPC tasks. | |
416 | */ | |
417 | if (!host->h_server) | |
418 | args.flags |= RPC_CLNT_CREATE_HARDRTRY; | |
419 | ||
e1ec7892 CL |
420 | clnt = rpc_create(&args); |
421 | if (!IS_ERR(clnt)) | |
422 | host->h_rpcclnt = clnt; | |
423 | else { | |
424 | printk("lockd: couldn't create RPC handle for %s\n", host->h_name); | |
425 | clnt = NULL; | |
426 | } | |
1da177e4 LT |
427 | } |
428 | ||
50467914 | 429 | mutex_unlock(&host->h_mutex); |
1da177e4 | 430 | return clnt; |
1da177e4 LT |
431 | } |
432 | ||
433 | /* | |
434 | * Force a portmap lookup of the remote lockd port | |
435 | */ | |
436 | void | |
437 | nlm_rebind_host(struct nlm_host *host) | |
438 | { | |
439 | dprintk("lockd: rebind host %s\n", host->h_name); | |
440 | if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) { | |
35f5a422 | 441 | rpc_force_rebind(host->h_rpcclnt); |
1da177e4 LT |
442 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
443 | } | |
444 | } | |
445 | ||
446 | /* | |
447 | * Increment NLM host count | |
448 | */ | |
449 | struct nlm_host * nlm_get_host(struct nlm_host *host) | |
450 | { | |
451 | if (host) { | |
452 | dprintk("lockd: get host %s\n", host->h_name); | |
453 | atomic_inc(&host->h_count); | |
454 | host->h_expires = jiffies + NLM_HOST_EXPIRE; | |
455 | } | |
456 | return host; | |
457 | } | |
458 | ||
459 | /* | |
460 | * Release NLM host after use | |
461 | */ | |
462 | void nlm_release_host(struct nlm_host *host) | |
463 | { | |
464 | if (host != NULL) { | |
465 | dprintk("lockd: release host %s\n", host->h_name); | |
1da177e4 | 466 | BUG_ON(atomic_read(&host->h_count) < 0); |
4c060b53 TM |
467 | if (atomic_dec_and_test(&host->h_count)) { |
468 | BUG_ON(!list_empty(&host->h_lockowners)); | |
469 | BUG_ON(!list_empty(&host->h_granted)); | |
470 | BUG_ON(!list_empty(&host->h_reclaim)); | |
471 | } | |
1da177e4 LT |
472 | } |
473 | } | |
474 | ||
cf712c24 OK |
475 | /* |
476 | * We were notified that the host indicated by address &sin | |
477 | * has rebooted. | |
478 | * Release all resources held by that peer. | |
479 | */ | |
5c8dd29c | 480 | void nlm_host_rebooted(const struct sockaddr_in *sin, |
48df020a CL |
481 | const char *hostname, |
482 | unsigned int hostname_len, | |
5c8dd29c | 483 | u32 new_state) |
cf712c24 | 484 | { |
0cea3276 OK |
485 | struct hlist_head *chain; |
486 | struct hlist_node *pos; | |
5c8dd29c | 487 | struct nsm_handle *nsm; |
0cea3276 | 488 | struct nlm_host *host; |
cf712c24 | 489 | |
e018040a CL |
490 | nsm = nsm_find((struct sockaddr *)sin, sizeof(*sin), |
491 | hostname, hostname_len, 0); | |
1b333c54 CL |
492 | if (nsm == NULL) { |
493 | dprintk("lockd: never saw rebooted peer '%.*s' before\n", | |
494 | hostname_len, hostname); | |
db4e4c9a | 495 | return; |
1b333c54 CL |
496 | } |
497 | ||
498 | dprintk("lockd: nlm_host_rebooted(%.*s, %s)\n", | |
499 | hostname_len, hostname, nsm->sm_addrbuf); | |
db4e4c9a | 500 | |
5c8dd29c OK |
501 | /* When reclaiming locks on this peer, make sure that |
502 | * we set up a new notification */ | |
503 | nsm->sm_monitored = 0; | |
504 | ||
505 | /* Mark all hosts tied to this NSM state as having rebooted. | |
506 | * We run the loop repeatedly, because we drop the host table | |
507 | * lock for this. | |
508 | * To avoid processing a host several times, we match the nsmstate. | |
509 | */ | |
510 | again: mutex_lock(&nlm_host_mutex); | |
0cea3276 OK |
511 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
512 | hlist_for_each_entry(host, pos, chain, h_hash) { | |
5c8dd29c OK |
513 | if (host->h_nsmhandle == nsm |
514 | && host->h_nsmstate != new_state) { | |
515 | host->h_nsmstate = new_state; | |
516 | host->h_state++; | |
517 | ||
518 | nlm_get_host(host); | |
519 | mutex_unlock(&nlm_host_mutex); | |
520 | ||
521 | if (host->h_server) { | |
522 | /* We're server for this guy, just ditch | |
523 | * all the locks he held. */ | |
524 | nlmsvc_free_host_resources(host); | |
525 | } else { | |
526 | /* He's the server, initiate lock recovery. */ | |
527 | nlmclnt_recovery(host); | |
528 | } | |
529 | ||
530 | nlm_release_host(host); | |
531 | goto again; | |
532 | } | |
533 | } | |
cf712c24 | 534 | } |
5c8dd29c OK |
535 | |
536 | mutex_unlock(&nlm_host_mutex); | |
cf712c24 OK |
537 | } |
538 | ||
1da177e4 LT |
539 | /* |
540 | * Shut down the hosts module. | |
541 | * Note that this routine is called only at server shutdown time. | |
542 | */ | |
543 | void | |
544 | nlm_shutdown_hosts(void) | |
545 | { | |
0cea3276 OK |
546 | struct hlist_head *chain; |
547 | struct hlist_node *pos; | |
1da177e4 | 548 | struct nlm_host *host; |
1da177e4 LT |
549 | |
550 | dprintk("lockd: shutting down host module\n"); | |
353ab6e9 | 551 | mutex_lock(&nlm_host_mutex); |
1da177e4 LT |
552 | |
553 | /* First, make all hosts eligible for gc */ | |
554 | dprintk("lockd: nuking all hosts...\n"); | |
0cea3276 | 555 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
d801b861 | 556 | hlist_for_each_entry(host, pos, chain, h_hash) { |
1da177e4 | 557 | host->h_expires = jiffies - 1; |
d801b861 JL |
558 | if (host->h_rpcclnt) { |
559 | rpc_shutdown_client(host->h_rpcclnt); | |
560 | host->h_rpcclnt = NULL; | |
561 | } | |
562 | } | |
1da177e4 LT |
563 | } |
564 | ||
565 | /* Then, perform a garbage collection pass */ | |
566 | nlm_gc_hosts(); | |
353ab6e9 | 567 | mutex_unlock(&nlm_host_mutex); |
1da177e4 LT |
568 | |
569 | /* complain if any hosts are left */ | |
570 | if (nrhosts) { | |
571 | printk(KERN_WARNING "lockd: couldn't shutdown host module!\n"); | |
572 | dprintk("lockd: %d hosts left:\n", nrhosts); | |
0cea3276 OK |
573 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
574 | hlist_for_each_entry(host, pos, chain, h_hash) { | |
1da177e4 LT |
575 | dprintk(" %s (cnt %d use %d exp %ld)\n", |
576 | host->h_name, atomic_read(&host->h_count), | |
577 | host->h_inuse, host->h_expires); | |
578 | } | |
579 | } | |
580 | } | |
581 | } | |
582 | ||
583 | /* | |
584 | * Garbage collect any unused NLM hosts. | |
585 | * This GC combines reference counting for async operations with | |
586 | * mark & sweep for resources held by remote clients. | |
587 | */ | |
588 | static void | |
589 | nlm_gc_hosts(void) | |
590 | { | |
0cea3276 OK |
591 | struct hlist_head *chain; |
592 | struct hlist_node *pos, *next; | |
593 | struct nlm_host *host; | |
1da177e4 LT |
594 | |
595 | dprintk("lockd: host garbage collection\n"); | |
0cea3276 OK |
596 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
597 | hlist_for_each_entry(host, pos, chain, h_hash) | |
1da177e4 LT |
598 | host->h_inuse = 0; |
599 | } | |
600 | ||
601 | /* Mark all hosts that hold locks, blocks or shares */ | |
602 | nlmsvc_mark_resources(); | |
603 | ||
0cea3276 OK |
604 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
605 | hlist_for_each_entry_safe(host, pos, next, chain, h_hash) { | |
1da177e4 LT |
606 | if (atomic_read(&host->h_count) || host->h_inuse |
607 | || time_before(jiffies, host->h_expires)) { | |
608 | dprintk("nlm_gc_hosts skipping %s (cnt %d use %d exp %ld)\n", | |
609 | host->h_name, atomic_read(&host->h_count), | |
610 | host->h_inuse, host->h_expires); | |
1da177e4 LT |
611 | continue; |
612 | } | |
613 | dprintk("lockd: delete host %s\n", host->h_name); | |
0cea3276 | 614 | hlist_del_init(&host->h_hash); |
977faf39 | 615 | |
c53c1bb9 | 616 | nlm_destroy_host(host); |
1da177e4 LT |
617 | nrhosts--; |
618 | } | |
619 | } | |
620 | ||
621 | next_gc = jiffies + NLM_HOST_COLLECT; | |
622 | } | |
623 | ||
8dead0db OK |
624 | |
625 | /* | |
626 | * Manage NSM handles | |
627 | */ | |
628 | static LIST_HEAD(nsm_handles); | |
d8421202 | 629 | static DEFINE_SPINLOCK(nsm_lock); |
8dead0db | 630 | |
e018040a CL |
631 | static struct nsm_handle *nsm_find(const struct sockaddr *sap, |
632 | const size_t salen, | |
bc48e4d6 CL |
633 | const char *hostname, |
634 | const size_t hostname_len, | |
635 | const int create) | |
8dead0db OK |
636 | { |
637 | struct nsm_handle *nsm = NULL; | |
a95e56e7 | 638 | struct nsm_handle *pos; |
8dead0db | 639 | |
e018040a | 640 | if (!sap) |
8dead0db OK |
641 | return NULL; |
642 | ||
643 | if (hostname && memchr(hostname, '/', hostname_len) != NULL) { | |
644 | if (printk_ratelimit()) { | |
645 | printk(KERN_WARNING "Invalid hostname \"%.*s\" " | |
646 | "in NFS lock request\n", | |
bc48e4d6 | 647 | (int)hostname_len, hostname); |
8dead0db OK |
648 | } |
649 | return NULL; | |
650 | } | |
651 | ||
d8421202 BF |
652 | retry: |
653 | spin_lock(&nsm_lock); | |
a95e56e7 | 654 | list_for_each_entry(pos, &nsm_handles, sm_link) { |
8dead0db | 655 | |
abd1f500 | 656 | if (hostname && nsm_use_hostnames) { |
a95e56e7 BF |
657 | if (strlen(pos->sm_name) != hostname_len |
658 | || memcmp(pos->sm_name, hostname, hostname_len)) | |
abd1f500 | 659 | continue; |
e018040a | 660 | } else if (!nlm_cmp_addr(nsm_addr(pos), sap)) |
8dead0db | 661 | continue; |
a95e56e7 | 662 | atomic_inc(&pos->sm_count); |
d8421202 | 663 | kfree(nsm); |
a95e56e7 | 664 | nsm = pos; |
d8421202 | 665 | goto found; |
8dead0db | 666 | } |
d8421202 BF |
667 | if (nsm) { |
668 | list_add(&nsm->sm_link, &nsm_handles); | |
669 | goto found; | |
8dead0db | 670 | } |
d8421202 BF |
671 | spin_unlock(&nsm_lock); |
672 | ||
673 | if (!create) | |
674 | return NULL; | |
8dead0db OK |
675 | |
676 | nsm = kzalloc(sizeof(*nsm) + hostname_len + 1, GFP_KERNEL); | |
a95e56e7 | 677 | if (nsm == NULL) |
d8421202 BF |
678 | return NULL; |
679 | ||
e018040a CL |
680 | memcpy(nsm_addr(nsm), sap, salen); |
681 | nsm->sm_addrlen = salen; | |
a95e56e7 BF |
682 | nsm->sm_name = (char *) (nsm + 1); |
683 | memcpy(nsm->sm_name, hostname, hostname_len); | |
684 | nsm->sm_name[hostname_len] = '\0'; | |
1b333c54 CL |
685 | nlm_display_address((struct sockaddr *)&nsm->sm_addr, |
686 | nsm->sm_addrbuf, sizeof(nsm->sm_addrbuf)); | |
a95e56e7 | 687 | atomic_set(&nsm->sm_count, 1); |
d8421202 | 688 | goto retry; |
a95e56e7 | 689 | |
d8421202 BF |
690 | found: |
691 | spin_unlock(&nsm_lock); | |
8dead0db OK |
692 | return nsm; |
693 | } | |
694 | ||
8dead0db OK |
695 | /* |
696 | * Release an NSM handle | |
697 | */ | |
698 | void | |
699 | nsm_release(struct nsm_handle *nsm) | |
700 | { | |
701 | if (!nsm) | |
702 | return; | |
d8421202 | 703 | if (atomic_dec_and_lock(&nsm->sm_count, &nsm_lock)) { |
164f98ad | 704 | list_del(&nsm->sm_link); |
d8421202 | 705 | spin_unlock(&nsm_lock); |
164f98ad | 706 | kfree(nsm); |
8dead0db OK |
707 | } |
708 | } |