Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/slab.h> |
| 13 | #include <linux/in.h> |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 14 | #include <linux/in6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/sunrpc/clnt.h> |
| 16 | #include <linux/sunrpc/svc.h> |
| 17 | #include <linux/lockd/lockd.h> |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 18 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
Stanislav Kinsbursky | 66697bf | 2012-01-31 15:08:13 +0400 | [diff] [blame] | 20 | #include <linux/sunrpc/svc_xprt.h> |
| 21 | |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 22 | #include <net/ipv6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Stanislav Kinsbursky | 3cf7fb0 | 2012-07-25 16:56:11 +0400 | [diff] [blame] | 24 | #include "netns.h" |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #define NLMDBG_FACILITY NLMDBG_HOSTCACHE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #define NLM_HOST_NRHASH 32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #define NLM_HOST_REBIND (60 * HZ) |
NeilBrown | 1447d25 | 2008-02-08 13:03:37 +1100 | [diff] [blame] | 29 | #define NLM_HOST_EXPIRE (300 * HZ) |
| 30 | #define NLM_HOST_COLLECT (120 * HZ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
Chuck Lever | d2df048 | 2010-12-14 15:06:22 +0000 | [diff] [blame] | 32 | static struct hlist_head nlm_server_hosts[NLM_HOST_NRHASH]; |
Chuck Lever | 8ea6ecc | 2010-12-14 15:05:52 +0000 | [diff] [blame] | 33 | static struct hlist_head nlm_client_hosts[NLM_HOST_NRHASH]; |
J. Bruce Fields | b113746 | 2010-12-14 15:05:03 +0000 | [diff] [blame] | 34 | |
| 35 | #define for_each_host(host, pos, chain, table) \ |
| 36 | for ((chain) = (table); \ |
| 37 | (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \ |
| 38 | hlist_for_each_entry((host), (pos), (chain), h_hash) |
| 39 | |
| 40 | #define for_each_host_safe(host, pos, next, chain, table) \ |
| 41 | for ((chain) = (table); \ |
| 42 | (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \ |
| 43 | hlist_for_each_entry_safe((host), (pos), (next), \ |
| 44 | (chain), h_hash) |
| 45 | |
Chuck Lever | fcc072c | 2010-12-14 15:06:32 +0000 | [diff] [blame] | 46 | static unsigned long nrhosts; |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 47 | static DEFINE_MUTEX(nlm_host_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Stanislav Kinsbursky | 27adadd | 2012-07-25 16:56:03 +0400 | [diff] [blame] | 49 | static void nlm_gc_hosts(struct net *net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 51 | struct nlm_lookup_host_info { |
| 52 | const int server; /* search for server|client */ |
Chuck Lever | 88541c8 | 2008-10-03 12:50:14 -0400 | [diff] [blame] | 53 | const struct sockaddr *sap; /* address to search for */ |
| 54 | const size_t salen; /* it's length */ |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 55 | const unsigned short protocol; /* transport to search for*/ |
| 56 | const u32 version; /* NLM version to search for */ |
| 57 | const char *hostname; /* remote's hostname */ |
| 58 | const size_t hostname_len; /* it's length */ |
Chuck Lever | 0cb2659 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 59 | const int noresvport; /* use non-priv port */ |
Stanislav Kinsbursky | 66697bf | 2012-01-31 15:08:13 +0400 | [diff] [blame] | 60 | struct net *net; /* network namespace to bind */ |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 61 | }; |
| 62 | |
Chuck Lever | ede2fea | 2008-09-03 14:36:08 -0400 | [diff] [blame] | 63 | /* |
| 64 | * Hash function must work well on big- and little-endian platforms |
| 65 | */ |
| 66 | static unsigned int __nlm_hash32(const __be32 n) |
| 67 | { |
| 68 | unsigned int hash = (__force u32)n ^ ((__force u32)n >> 16); |
| 69 | return hash ^ (hash >> 8); |
| 70 | } |
| 71 | |
| 72 | static unsigned int __nlm_hash_addr4(const struct sockaddr *sap) |
| 73 | { |
| 74 | const struct sockaddr_in *sin = (struct sockaddr_in *)sap; |
| 75 | return __nlm_hash32(sin->sin_addr.s_addr); |
| 76 | } |
| 77 | |
| 78 | static unsigned int __nlm_hash_addr6(const struct sockaddr *sap) |
| 79 | { |
| 80 | const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; |
| 81 | const struct in6_addr addr = sin6->sin6_addr; |
| 82 | return __nlm_hash32(addr.s6_addr32[0]) ^ |
| 83 | __nlm_hash32(addr.s6_addr32[1]) ^ |
| 84 | __nlm_hash32(addr.s6_addr32[2]) ^ |
| 85 | __nlm_hash32(addr.s6_addr32[3]); |
| 86 | } |
| 87 | |
| 88 | static unsigned int nlm_hash_address(const struct sockaddr *sap) |
| 89 | { |
| 90 | unsigned int hash; |
| 91 | |
| 92 | switch (sap->sa_family) { |
| 93 | case AF_INET: |
| 94 | hash = __nlm_hash_addr4(sap); |
| 95 | break; |
| 96 | case AF_INET6: |
| 97 | hash = __nlm_hash_addr6(sap); |
| 98 | break; |
| 99 | default: |
| 100 | hash = 0; |
| 101 | } |
| 102 | return hash & (NLM_HOST_NRHASH - 1); |
| 103 | } |
| 104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | /* |
Chuck Lever | a7952f4 | 2010-12-14 15:05:23 +0000 | [diff] [blame] | 106 | * Allocate and initialize an nlm_host. Common to both client and server. |
| 107 | */ |
| 108 | static struct nlm_host *nlm_alloc_host(struct nlm_lookup_host_info *ni, |
| 109 | struct nsm_handle *nsm) |
| 110 | { |
| 111 | struct nlm_host *host = NULL; |
| 112 | unsigned long now = jiffies; |
| 113 | |
| 114 | if (nsm != NULL) |
| 115 | atomic_inc(&nsm->sm_count); |
| 116 | else { |
| 117 | host = NULL; |
| 118 | nsm = nsm_get_handle(ni->sap, ni->salen, |
| 119 | ni->hostname, ni->hostname_len); |
| 120 | if (unlikely(nsm == NULL)) { |
| 121 | dprintk("lockd: %s failed; no nsm handle\n", |
| 122 | __func__); |
| 123 | goto out; |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | host = kmalloc(sizeof(*host), GFP_KERNEL); |
| 128 | if (unlikely(host == NULL)) { |
| 129 | dprintk("lockd: %s failed; no memory\n", __func__); |
| 130 | nsm_release(nsm); |
| 131 | goto out; |
| 132 | } |
| 133 | |
| 134 | memcpy(nlm_addr(host), ni->sap, ni->salen); |
| 135 | host->h_addrlen = ni->salen; |
| 136 | rpc_set_port(nlm_addr(host), 0); |
| 137 | host->h_srcaddrlen = 0; |
| 138 | |
| 139 | host->h_rpcclnt = NULL; |
| 140 | host->h_name = nsm->sm_name; |
| 141 | host->h_version = ni->version; |
| 142 | host->h_proto = ni->protocol; |
| 143 | host->h_reclaiming = 0; |
| 144 | host->h_server = ni->server; |
| 145 | host->h_noresvport = ni->noresvport; |
| 146 | host->h_inuse = 0; |
| 147 | init_waitqueue_head(&host->h_gracewait); |
| 148 | init_rwsem(&host->h_rwsem); |
| 149 | host->h_state = 0; |
| 150 | host->h_nsmstate = 0; |
| 151 | host->h_pidcount = 0; |
| 152 | atomic_set(&host->h_count, 1); |
| 153 | mutex_init(&host->h_mutex); |
| 154 | host->h_nextrebind = now + NLM_HOST_REBIND; |
| 155 | host->h_expires = now + NLM_HOST_EXPIRE; |
| 156 | INIT_LIST_HEAD(&host->h_lockowners); |
| 157 | spin_lock_init(&host->h_lock); |
| 158 | INIT_LIST_HEAD(&host->h_granted); |
| 159 | INIT_LIST_HEAD(&host->h_reclaim); |
| 160 | host->h_nsmhandle = nsm; |
| 161 | host->h_addrbuf = nsm->sm_addrbuf; |
Stanislav Kinsbursky | 66697bf | 2012-01-31 15:08:13 +0400 | [diff] [blame] | 162 | host->net = ni->net; |
Chuck Lever | a7952f4 | 2010-12-14 15:05:23 +0000 | [diff] [blame] | 163 | |
| 164 | out: |
| 165 | return host; |
| 166 | } |
| 167 | |
| 168 | /* |
Chuck Lever | 723bb5b | 2010-12-14 15:05:33 +0000 | [diff] [blame] | 169 | * Destroy an nlm_host and free associated resources |
| 170 | * |
| 171 | * Caller must hold nlm_host_mutex. |
Olaf Kirch | c53c1bb | 2006-10-04 02:16:00 -0700 | [diff] [blame] | 172 | */ |
Chuck Lever | 723bb5b | 2010-12-14 15:05:33 +0000 | [diff] [blame] | 173 | static void nlm_destroy_host_locked(struct nlm_host *host) |
Olaf Kirch | c53c1bb | 2006-10-04 02:16:00 -0700 | [diff] [blame] | 174 | { |
| 175 | struct rpc_clnt *clnt; |
Stanislav Kinsbursky | caa4e76 | 2012-07-25 16:56:19 +0400 | [diff] [blame] | 176 | struct lockd_net *ln = net_generic(host->net, lockd_net_id); |
Olaf Kirch | c53c1bb | 2006-10-04 02:16:00 -0700 | [diff] [blame] | 177 | |
Chuck Lever | 723bb5b | 2010-12-14 15:05:33 +0000 | [diff] [blame] | 178 | dprintk("lockd: destroy host %s\n", host->h_name); |
| 179 | |
Chuck Lever | 723bb5b | 2010-12-14 15:05:33 +0000 | [diff] [blame] | 180 | hlist_del_init(&host->h_hash); |
| 181 | |
Olaf Kirch | c53c1bb | 2006-10-04 02:16:00 -0700 | [diff] [blame] | 182 | nsm_unmonitor(host); |
Chuck Lever | c8c23c4 | 2008-12-04 14:21:31 -0500 | [diff] [blame] | 183 | nsm_release(host->h_nsmhandle); |
Olaf Kirch | c53c1bb | 2006-10-04 02:16:00 -0700 | [diff] [blame] | 184 | |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 185 | clnt = host->h_rpcclnt; |
| 186 | if (clnt != NULL) |
| 187 | rpc_shutdown_client(clnt); |
Olaf Kirch | c53c1bb | 2006-10-04 02:16:00 -0700 | [diff] [blame] | 188 | kfree(host); |
Chuck Lever | 723bb5b | 2010-12-14 15:05:33 +0000 | [diff] [blame] | 189 | |
Stanislav Kinsbursky | caa4e76 | 2012-07-25 16:56:19 +0400 | [diff] [blame] | 190 | ln->nrhosts--; |
Chuck Lever | 723bb5b | 2010-12-14 15:05:33 +0000 | [diff] [blame] | 191 | nrhosts--; |
Olaf Kirch | c53c1bb | 2006-10-04 02:16:00 -0700 | [diff] [blame] | 192 | } |
| 193 | |
Chuck Lever | d7d2044 | 2008-10-03 12:50:21 -0400 | [diff] [blame] | 194 | /** |
| 195 | * nlmclnt_lookup_host - Find an NLM host handle matching a remote server |
| 196 | * @sap: network address of server |
| 197 | * @salen: length of server address |
| 198 | * @protocol: transport protocol to use |
| 199 | * @version: NLM protocol version |
| 200 | * @hostname: '\0'-terminated hostname of server |
Chuck Lever | 0cb2659 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 201 | * @noresvport: 1 if non-privileged port should be used |
Chuck Lever | d7d2044 | 2008-10-03 12:50:21 -0400 | [diff] [blame] | 202 | * |
| 203 | * Returns an nlm_host structure that matches the passed-in |
| 204 | * [server address, transport protocol, NLM version, server hostname]. |
| 205 | * If one doesn't already exist in the host cache, a new handle is |
| 206 | * created and returned. |
Adrian Bunk | c585646 | 2006-12-06 20:38:29 -0800 | [diff] [blame] | 207 | */ |
Chuck Lever | d7d2044 | 2008-10-03 12:50:21 -0400 | [diff] [blame] | 208 | struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap, |
| 209 | const size_t salen, |
| 210 | const unsigned short protocol, |
Chuck Lever | 0cb2659 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 211 | const u32 version, |
| 212 | const char *hostname, |
Stanislav Kinsbursky | 66697bf | 2012-01-31 15:08:13 +0400 | [diff] [blame] | 213 | int noresvport, |
| 214 | struct net *net) |
Adrian Bunk | c585646 | 2006-12-06 20:38:29 -0800 | [diff] [blame] | 215 | { |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 216 | struct nlm_lookup_host_info ni = { |
| 217 | .server = 0, |
Chuck Lever | d7d2044 | 2008-10-03 12:50:21 -0400 | [diff] [blame] | 218 | .sap = sap, |
| 219 | .salen = salen, |
| 220 | .protocol = protocol, |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 221 | .version = version, |
| 222 | .hostname = hostname, |
Chuck Lever | d7d2044 | 2008-10-03 12:50:21 -0400 | [diff] [blame] | 223 | .hostname_len = strlen(hostname), |
Chuck Lever | 0cb2659 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 224 | .noresvport = noresvport, |
Stanislav Kinsbursky | 66697bf | 2012-01-31 15:08:13 +0400 | [diff] [blame] | 225 | .net = net, |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 226 | }; |
Chuck Lever | 8ea6ecc | 2010-12-14 15:05:52 +0000 | [diff] [blame] | 227 | struct hlist_head *chain; |
| 228 | struct hlist_node *pos; |
| 229 | struct nlm_host *host; |
| 230 | struct nsm_handle *nsm = NULL; |
Stanislav Kinsbursky | caa4e76 | 2012-07-25 16:56:19 +0400 | [diff] [blame] | 231 | struct lockd_net *ln = net_generic(net, lockd_net_id); |
Frank van Maarseveen | c98451b | 2007-07-09 22:25:29 +0200 | [diff] [blame] | 232 | |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 233 | dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__, |
| 234 | (hostname ? hostname : "<none>"), version, |
Chuck Lever | d7d2044 | 2008-10-03 12:50:21 -0400 | [diff] [blame] | 235 | (protocol == IPPROTO_UDP ? "udp" : "tcp")); |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 236 | |
Chuck Lever | 8ea6ecc | 2010-12-14 15:05:52 +0000 | [diff] [blame] | 237 | mutex_lock(&nlm_host_mutex); |
| 238 | |
| 239 | chain = &nlm_client_hosts[nlm_hash_address(sap)]; |
| 240 | hlist_for_each_entry(host, pos, chain, h_hash) { |
Stanislav Kinsbursky | 66697bf | 2012-01-31 15:08:13 +0400 | [diff] [blame] | 241 | if (host->net != net) |
| 242 | continue; |
Chuck Lever | 8ea6ecc | 2010-12-14 15:05:52 +0000 | [diff] [blame] | 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); |
Stanislav Kinsbursky | caa4e76 | 2012-07-25 16:56:19 +0400 | [diff] [blame] | 266 | ln->nrhosts++; |
Chuck Lever | 8ea6ecc | 2010-12-14 15:05:52 +0000 | [diff] [blame] | 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 | |
Trond Myklebust | a2d30a5 | 2012-10-15 17:26:20 -0400 | [diff] [blame^] | 289 | WARN_ON_ONCE(host->h_server); |
Chuck Lever | 8ea6ecc | 2010-12-14 15:05:52 +0000 | [diff] [blame] | 290 | |
| 291 | if (atomic_dec_and_test(&host->h_count)) { |
Trond Myklebust | a2d30a5 | 2012-10-15 17:26:20 -0400 | [diff] [blame^] | 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)); |
Chuck Lever | 8ea6ecc | 2010-12-14 15:05:52 +0000 | [diff] [blame] | 295 | |
| 296 | mutex_lock(&nlm_host_mutex); |
| 297 | nlm_destroy_host_locked(host); |
| 298 | mutex_unlock(&nlm_host_mutex); |
| 299 | } |
Adrian Bunk | c585646 | 2006-12-06 20:38:29 -0800 | [diff] [blame] | 300 | } |
| 301 | |
Chuck Lever | 6bfbe8a | 2008-10-03 12:50:29 -0400 | [diff] [blame] | 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. |
Adrian Bunk | c585646 | 2006-12-06 20:38:29 -0800 | [diff] [blame] | 319 | */ |
Chuck Lever | 6bfbe8a | 2008-10-03 12:50:29 -0400 | [diff] [blame] | 320 | struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp, |
| 321 | const char *hostname, |
| 322 | const size_t hostname_len) |
Adrian Bunk | c585646 | 2006-12-06 20:38:29 -0800 | [diff] [blame] | 323 | { |
Chuck Lever | 67216b9 | 2010-12-14 15:06:12 +0000 | [diff] [blame] | 324 | struct hlist_head *chain; |
| 325 | struct hlist_node *pos; |
| 326 | struct nlm_host *host = NULL; |
| 327 | struct nsm_handle *nsm = NULL; |
Mi Jinlong | 849a1cf | 2011-08-30 17:18:41 +0800 | [diff] [blame] | 328 | struct sockaddr *src_sap = svc_daddr(rqstp); |
| 329 | size_t src_len = rqstp->rq_daddrlen; |
Stanislav Kinsbursky | 9695c70 | 2012-07-25 16:57:06 +0400 | [diff] [blame] | 330 | struct net *net = SVC_NET(rqstp); |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 331 | struct nlm_lookup_host_info ni = { |
| 332 | .server = 1, |
Chuck Lever | 88541c8 | 2008-10-03 12:50:14 -0400 | [diff] [blame] | 333 | .sap = svc_addr(rqstp), |
| 334 | .salen = rqstp->rq_addrlen, |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 335 | .protocol = rqstp->rq_prot, |
| 336 | .version = rqstp->rq_vers, |
| 337 | .hostname = hostname, |
| 338 | .hostname_len = hostname_len, |
Stanislav Kinsbursky | 66697bf | 2012-01-31 15:08:13 +0400 | [diff] [blame] | 339 | .net = net, |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 340 | }; |
Stanislav Kinsbursky | 3cf7fb0 | 2012-07-25 16:56:11 +0400 | [diff] [blame] | 341 | struct lockd_net *ln = net_generic(net, lockd_net_id); |
Frank van Maarseveen | c98451b | 2007-07-09 22:25:29 +0200 | [diff] [blame] | 342 | |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 343 | dprintk("lockd: %s(host='%*s', vers=%u, proto=%s)\n", __func__, |
| 344 | (int)hostname_len, hostname, rqstp->rq_vers, |
| 345 | (rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp")); |
| 346 | |
Chuck Lever | 67216b9 | 2010-12-14 15:06:12 +0000 | [diff] [blame] | 347 | mutex_lock(&nlm_host_mutex); |
| 348 | |
Stanislav Kinsbursky | 3cf7fb0 | 2012-07-25 16:56:11 +0400 | [diff] [blame] | 349 | if (time_after_eq(jiffies, ln->next_gc)) |
Stanislav Kinsbursky | 27adadd | 2012-07-25 16:56:03 +0400 | [diff] [blame] | 350 | nlm_gc_hosts(net); |
Chuck Lever | 67216b9 | 2010-12-14 15:06:12 +0000 | [diff] [blame] | 351 | |
Chuck Lever | d2df048 | 2010-12-14 15:06:22 +0000 | [diff] [blame] | 352 | chain = &nlm_server_hosts[nlm_hash_address(ni.sap)]; |
Chuck Lever | 67216b9 | 2010-12-14 15:06:12 +0000 | [diff] [blame] | 353 | hlist_for_each_entry(host, pos, chain, h_hash) { |
Stanislav Kinsbursky | 66697bf | 2012-01-31 15:08:13 +0400 | [diff] [blame] | 354 | if (host->net != net) |
| 355 | continue; |
Chuck Lever | 67216b9 | 2010-12-14 15:06:12 +0000 | [diff] [blame] | 356 | if (!rpc_cmp_addr(nlm_addr(host), ni.sap)) |
| 357 | continue; |
| 358 | |
| 359 | /* Same address. Share an NSM handle if we already have one */ |
| 360 | if (nsm == NULL) |
| 361 | nsm = host->h_nsmhandle; |
| 362 | |
| 363 | if (host->h_proto != ni.protocol) |
| 364 | continue; |
| 365 | if (host->h_version != ni.version) |
| 366 | continue; |
Chuck Lever | 7969183 | 2010-12-14 15:06:52 +0000 | [diff] [blame] | 367 | if (!rpc_cmp_addr(nlm_srcaddr(host), src_sap)) |
Chuck Lever | 67216b9 | 2010-12-14 15:06:12 +0000 | [diff] [blame] | 368 | continue; |
| 369 | |
| 370 | /* Move to head of hash chain. */ |
| 371 | hlist_del(&host->h_hash); |
| 372 | hlist_add_head(&host->h_hash, chain); |
| 373 | |
| 374 | nlm_get_host(host); |
| 375 | dprintk("lockd: %s found host %s (%s)\n", |
| 376 | __func__, host->h_name, host->h_addrbuf); |
| 377 | goto out; |
| 378 | } |
| 379 | |
| 380 | host = nlm_alloc_host(&ni, nsm); |
| 381 | if (unlikely(host == NULL)) |
| 382 | goto out; |
| 383 | |
Chuck Lever | 7969183 | 2010-12-14 15:06:52 +0000 | [diff] [blame] | 384 | memcpy(nlm_srcaddr(host), src_sap, src_len); |
| 385 | host->h_srcaddrlen = src_len; |
Chuck Lever | 67216b9 | 2010-12-14 15:06:12 +0000 | [diff] [blame] | 386 | hlist_add_head(&host->h_hash, chain); |
Stanislav Kinsbursky | caa4e76 | 2012-07-25 16:56:19 +0400 | [diff] [blame] | 387 | ln->nrhosts++; |
Chuck Lever | 67216b9 | 2010-12-14 15:06:12 +0000 | [diff] [blame] | 388 | nrhosts++; |
| 389 | |
| 390 | dprintk("lockd: %s created host %s (%s)\n", |
| 391 | __func__, host->h_name, host->h_addrbuf); |
| 392 | |
| 393 | out: |
| 394 | mutex_unlock(&nlm_host_mutex); |
| 395 | return host; |
| 396 | } |
| 397 | |
| 398 | /** |
| 399 | * nlmsvc_release_host - release server nlm_host |
| 400 | * @host: nlm_host to release |
| 401 | * |
| 402 | * Host is destroyed later in nlm_gc_host(). |
| 403 | */ |
| 404 | void nlmsvc_release_host(struct nlm_host *host) |
| 405 | { |
| 406 | if (host == NULL) |
| 407 | return; |
| 408 | |
| 409 | dprintk("lockd: release server host %s\n", host->h_name); |
| 410 | |
Trond Myklebust | a2d30a5 | 2012-10-15 17:26:20 -0400 | [diff] [blame^] | 411 | WARN_ON_ONCE(!host->h_server); |
Chuck Lever | 67216b9 | 2010-12-14 15:06:12 +0000 | [diff] [blame] | 412 | atomic_dec(&host->h_count); |
Adrian Bunk | c585646 | 2006-12-06 20:38:29 -0800 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | * Create the NLM RPC client for an NLM peer |
| 417 | */ |
| 418 | struct rpc_clnt * |
| 419 | nlm_bind_host(struct nlm_host *host) |
| 420 | { |
| 421 | struct rpc_clnt *clnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | |
Chuck Lever | 1df40b6 | 2008-12-04 14:19:53 -0500 | [diff] [blame] | 423 | dprintk("lockd: nlm_bind_host %s (%s)\n", |
| 424 | host->h_name, host->h_addrbuf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | |
| 426 | /* Lock host handle */ |
Trond Myklebust | 5046791 | 2006-06-09 09:40:24 -0400 | [diff] [blame] | 427 | mutex_lock(&host->h_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | |
| 429 | /* If we've already created an RPC client, check whether |
| 430 | * RPC rebind is required |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | */ |
| 432 | if ((clnt = host->h_rpcclnt) != NULL) { |
Chuck Lever | 43118c2 | 2005-08-25 16:25:49 -0700 | [diff] [blame] | 433 | if (time_after_eq(jiffies, host->h_nextrebind)) { |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 434 | rpc_force_rebind(clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 436 | dprintk("lockd: next rebind in %lu jiffies\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | host->h_nextrebind - jiffies); |
| 438 | } |
| 439 | } else { |
Trond Myklebust | 21051ba | 2007-05-14 16:50:44 -0400 | [diff] [blame] | 440 | unsigned long increment = nlmsvc_timeout; |
Chuck Lever | e1ec789 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 441 | struct rpc_timeout timeparms = { |
| 442 | .to_initval = increment, |
| 443 | .to_increment = increment, |
| 444 | .to_maxval = increment * 6UL, |
| 445 | .to_retries = 5U, |
| 446 | }; |
| 447 | struct rpc_create_args args = { |
Stanislav Kinsbursky | 66697bf | 2012-01-31 15:08:13 +0400 | [diff] [blame] | 448 | .net = host->net, |
Chuck Lever | e1ec789 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 449 | .protocol = host->h_proto, |
Chuck Lever | b4ed58f | 2008-09-03 14:35:39 -0400 | [diff] [blame] | 450 | .address = nlm_addr(host), |
| 451 | .addrsize = host->h_addrlen, |
Chuck Lever | e1ec789 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 452 | .timeout = &timeparms, |
| 453 | .servername = host->h_name, |
| 454 | .program = &nlm_program, |
| 455 | .version = host->h_version, |
| 456 | .authflavor = RPC_AUTH_UNIX, |
Jeff Layton | 90bd17c | 2008-02-06 11:34:11 -0500 | [diff] [blame] | 457 | .flags = (RPC_CLNT_CREATE_NOPING | |
Chuck Lever | e1ec789 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 458 | RPC_CLNT_CREATE_AUTOBIND), |
| 459 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
Jeff Layton | 90bd17c | 2008-02-06 11:34:11 -0500 | [diff] [blame] | 461 | /* |
| 462 | * lockd retries server side blocks automatically so we want |
| 463 | * those to be soft RPC calls. Client side calls need to be |
| 464 | * hard RPC tasks. |
| 465 | */ |
| 466 | if (!host->h_server) |
| 467 | args.flags |= RPC_CLNT_CREATE_HARDRTRY; |
Chuck Lever | 0cb2659 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 468 | if (host->h_noresvport) |
| 469 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; |
Trond Myklebust | 8e35f8e | 2010-11-02 09:11:55 -0400 | [diff] [blame] | 470 | if (host->h_srcaddrlen) |
| 471 | args.saddress = nlm_srcaddr(host); |
Jeff Layton | 90bd17c | 2008-02-06 11:34:11 -0500 | [diff] [blame] | 472 | |
Chuck Lever | e1ec789 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 473 | clnt = rpc_create(&args); |
| 474 | if (!IS_ERR(clnt)) |
| 475 | host->h_rpcclnt = clnt; |
| 476 | else { |
| 477 | printk("lockd: couldn't create RPC handle for %s\n", host->h_name); |
| 478 | clnt = NULL; |
| 479 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | } |
| 481 | |
Trond Myklebust | 5046791 | 2006-06-09 09:40:24 -0400 | [diff] [blame] | 482 | mutex_unlock(&host->h_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | return clnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | } |
| 485 | |
| 486 | /* |
| 487 | * Force a portmap lookup of the remote lockd port |
| 488 | */ |
| 489 | void |
| 490 | nlm_rebind_host(struct nlm_host *host) |
| 491 | { |
| 492 | dprintk("lockd: rebind host %s\n", host->h_name); |
| 493 | if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) { |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 494 | rpc_force_rebind(host->h_rpcclnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | /* |
| 500 | * Increment NLM host count |
| 501 | */ |
| 502 | struct nlm_host * nlm_get_host(struct nlm_host *host) |
| 503 | { |
| 504 | if (host) { |
| 505 | dprintk("lockd: get host %s\n", host->h_name); |
| 506 | atomic_inc(&host->h_count); |
| 507 | host->h_expires = jiffies + NLM_HOST_EXPIRE; |
| 508 | } |
| 509 | return host; |
| 510 | } |
| 511 | |
J. Bruce Fields | b10e30f | 2010-12-14 15:05:13 +0000 | [diff] [blame] | 512 | static struct nlm_host *next_host_state(struct hlist_head *cache, |
| 513 | struct nsm_handle *nsm, |
| 514 | const struct nlm_reboot *info) |
| 515 | { |
Chuck Lever | 80c30e8 | 2011-01-24 20:50:26 +0000 | [diff] [blame] | 516 | struct nlm_host *host; |
J. Bruce Fields | b10e30f | 2010-12-14 15:05:13 +0000 | [diff] [blame] | 517 | struct hlist_head *chain; |
| 518 | struct hlist_node *pos; |
| 519 | |
| 520 | mutex_lock(&nlm_host_mutex); |
| 521 | for_each_host(host, pos, chain, cache) { |
| 522 | if (host->h_nsmhandle == nsm |
| 523 | && host->h_nsmstate != info->state) { |
| 524 | host->h_nsmstate = info->state; |
| 525 | host->h_state++; |
| 526 | |
| 527 | nlm_get_host(host); |
Chuck Lever | 80c30e8 | 2011-01-24 20:50:26 +0000 | [diff] [blame] | 528 | mutex_unlock(&nlm_host_mutex); |
| 529 | return host; |
J. Bruce Fields | b10e30f | 2010-12-14 15:05:13 +0000 | [diff] [blame] | 530 | } |
| 531 | } |
Chuck Lever | 80c30e8 | 2011-01-24 20:50:26 +0000 | [diff] [blame] | 532 | |
J. Bruce Fields | b10e30f | 2010-12-14 15:05:13 +0000 | [diff] [blame] | 533 | mutex_unlock(&nlm_host_mutex); |
Chuck Lever | 80c30e8 | 2011-01-24 20:50:26 +0000 | [diff] [blame] | 534 | return NULL; |
J. Bruce Fields | b10e30f | 2010-12-14 15:05:13 +0000 | [diff] [blame] | 535 | } |
| 536 | |
Chuck Lever | 7fefc9c | 2008-12-05 19:03:31 -0500 | [diff] [blame] | 537 | /** |
| 538 | * nlm_host_rebooted - Release all resources held by rebooted host |
| 539 | * @info: pointer to decoded results of NLM_SM_NOTIFY call |
| 540 | * |
| 541 | * We were notified that the specified host has rebooted. Release |
| 542 | * all resources held by that peer. |
Olaf Kirch | cf712c2 | 2006-10-04 02:15:52 -0700 | [diff] [blame] | 543 | */ |
Chuck Lever | 7fefc9c | 2008-12-05 19:03:31 -0500 | [diff] [blame] | 544 | void nlm_host_rebooted(const struct nlm_reboot *info) |
Olaf Kirch | cf712c2 | 2006-10-04 02:15:52 -0700 | [diff] [blame] | 545 | { |
Olaf Kirch | 5c8dd29 | 2006-10-04 02:15:55 -0700 | [diff] [blame] | 546 | struct nsm_handle *nsm; |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 547 | struct nlm_host *host; |
Olaf Kirch | cf712c2 | 2006-10-04 02:15:52 -0700 | [diff] [blame] | 548 | |
Chuck Lever | 8c7378f | 2008-12-05 19:03:54 -0500 | [diff] [blame] | 549 | nsm = nsm_reboot_lookup(info); |
| 550 | if (unlikely(nsm == NULL)) |
Olaf Kirch | db4e4c9 | 2006-10-04 02:15:52 -0700 | [diff] [blame] | 551 | return; |
Olaf Kirch | 5c8dd29 | 2006-10-04 02:15:55 -0700 | [diff] [blame] | 552 | |
| 553 | /* Mark all hosts tied to this NSM state as having rebooted. |
| 554 | * We run the loop repeatedly, because we drop the host table |
| 555 | * lock for this. |
| 556 | * To avoid processing a host several times, we match the nsmstate. |
| 557 | */ |
Chuck Lever | d2df048 | 2010-12-14 15:06:22 +0000 | [diff] [blame] | 558 | while ((host = next_host_state(nlm_server_hosts, nsm, info)) != NULL) { |
Chuck Lever | 8ea6ecc | 2010-12-14 15:05:52 +0000 | [diff] [blame] | 559 | nlmsvc_free_host_resources(host); |
Chuck Lever | 67216b9 | 2010-12-14 15:06:12 +0000 | [diff] [blame] | 560 | nlmsvc_release_host(host); |
Olaf Kirch | cf712c2 | 2006-10-04 02:15:52 -0700 | [diff] [blame] | 561 | } |
Chuck Lever | 8ea6ecc | 2010-12-14 15:05:52 +0000 | [diff] [blame] | 562 | while ((host = next_host_state(nlm_client_hosts, nsm, info)) != NULL) { |
| 563 | nlmclnt_recovery(host); |
| 564 | nlmclnt_release_host(host); |
| 565 | } |
| 566 | |
Jeff Layton | cdd30fa | 2010-02-05 15:09:12 -0500 | [diff] [blame] | 567 | nsm_release(nsm); |
Olaf Kirch | cf712c2 | 2006-10-04 02:15:52 -0700 | [diff] [blame] | 568 | } |
| 569 | |
Stanislav Kinsbursky | d5850ff | 2012-07-25 16:56:27 +0400 | [diff] [blame] | 570 | static void nlm_complain_hosts(struct net *net) |
| 571 | { |
| 572 | struct hlist_head *chain; |
| 573 | struct hlist_node *pos; |
| 574 | struct nlm_host *host; |
| 575 | |
| 576 | if (net) { |
| 577 | struct lockd_net *ln = net_generic(net, lockd_net_id); |
| 578 | |
| 579 | if (ln->nrhosts == 0) |
| 580 | return; |
| 581 | printk(KERN_WARNING "lockd: couldn't shutdown host module for net %p!\n", net); |
| 582 | dprintk("lockd: %lu hosts left in net %p:\n", ln->nrhosts, net); |
| 583 | } else { |
| 584 | if (nrhosts == 0) |
| 585 | return; |
| 586 | printk(KERN_WARNING "lockd: couldn't shutdown host module!\n"); |
| 587 | dprintk("lockd: %lu hosts left:\n", nrhosts); |
| 588 | } |
| 589 | |
| 590 | for_each_host(host, pos, chain, nlm_server_hosts) { |
| 591 | if (net && host->net != net) |
| 592 | continue; |
| 593 | dprintk(" %s (cnt %d use %d exp %ld net %p)\n", |
| 594 | host->h_name, atomic_read(&host->h_count), |
| 595 | host->h_inuse, host->h_expires, host->net); |
| 596 | } |
| 597 | } |
| 598 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | void |
Stanislav Kinsbursky | 3b64739 | 2012-01-31 15:08:29 +0400 | [diff] [blame] | 600 | nlm_shutdown_hosts_net(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | { |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 602 | struct hlist_head *chain; |
| 603 | struct hlist_node *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | struct nlm_host *host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 606 | mutex_lock(&nlm_host_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
| 608 | /* First, make all hosts eligible for gc */ |
Stanislav Kinsbursky | e2edaa9 | 2012-07-25 16:56:35 +0400 | [diff] [blame] | 609 | dprintk("lockd: nuking all hosts in net %p...\n", net); |
Chuck Lever | d2df048 | 2010-12-14 15:06:22 +0000 | [diff] [blame] | 610 | for_each_host(host, pos, chain, nlm_server_hosts) { |
Stanislav Kinsbursky | 3b64739 | 2012-01-31 15:08:29 +0400 | [diff] [blame] | 611 | if (net && host->net != net) |
| 612 | continue; |
J. Bruce Fields | b113746 | 2010-12-14 15:05:03 +0000 | [diff] [blame] | 613 | host->h_expires = jiffies - 1; |
| 614 | if (host->h_rpcclnt) { |
| 615 | rpc_shutdown_client(host->h_rpcclnt); |
| 616 | host->h_rpcclnt = NULL; |
Jeff Layton | d801b86 | 2008-01-29 10:30:55 -0500 | [diff] [blame] | 617 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | } |
| 619 | |
| 620 | /* Then, perform a garbage collection pass */ |
Stanislav Kinsbursky | 27adadd | 2012-07-25 16:56:03 +0400 | [diff] [blame] | 621 | nlm_gc_hosts(net); |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 622 | mutex_unlock(&nlm_host_mutex); |
Stanislav Kinsbursky | caa4e76 | 2012-07-25 16:56:19 +0400 | [diff] [blame] | 623 | |
Stanislav Kinsbursky | d5850ff | 2012-07-25 16:56:27 +0400 | [diff] [blame] | 624 | nlm_complain_hosts(net); |
Stanislav Kinsbursky | 3b64739 | 2012-01-31 15:08:29 +0400 | [diff] [blame] | 625 | } |
| 626 | |
| 627 | /* |
| 628 | * Shut down the hosts module. |
| 629 | * Note that this routine is called only at server shutdown time. |
| 630 | */ |
| 631 | void |
| 632 | nlm_shutdown_hosts(void) |
| 633 | { |
Stanislav Kinsbursky | e2edaa9 | 2012-07-25 16:56:35 +0400 | [diff] [blame] | 634 | dprintk("lockd: shutting down host module\n"); |
Stanislav Kinsbursky | 3b64739 | 2012-01-31 15:08:29 +0400 | [diff] [blame] | 635 | nlm_shutdown_hosts_net(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | } |
| 637 | |
| 638 | /* |
| 639 | * Garbage collect any unused NLM hosts. |
| 640 | * This GC combines reference counting for async operations with |
| 641 | * mark & sweep for resources held by remote clients. |
| 642 | */ |
| 643 | static void |
Stanislav Kinsbursky | 27adadd | 2012-07-25 16:56:03 +0400 | [diff] [blame] | 644 | nlm_gc_hosts(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | { |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 646 | struct hlist_head *chain; |
| 647 | struct hlist_node *pos, *next; |
| 648 | struct nlm_host *host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | |
Stanislav Kinsbursky | 27adadd | 2012-07-25 16:56:03 +0400 | [diff] [blame] | 650 | dprintk("lockd: host garbage collection for net %p\n", net); |
| 651 | for_each_host(host, pos, chain, nlm_server_hosts) { |
| 652 | if (net && host->net != net) |
| 653 | continue; |
J. Bruce Fields | b113746 | 2010-12-14 15:05:03 +0000 | [diff] [blame] | 654 | host->h_inuse = 0; |
Stanislav Kinsbursky | 27adadd | 2012-07-25 16:56:03 +0400 | [diff] [blame] | 655 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
| 657 | /* Mark all hosts that hold locks, blocks or shares */ |
Stanislav Kinsbursky | b26411f | 2012-07-25 16:55:54 +0400 | [diff] [blame] | 658 | nlmsvc_mark_resources(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
Chuck Lever | d2df048 | 2010-12-14 15:06:22 +0000 | [diff] [blame] | 660 | for_each_host_safe(host, pos, next, chain, nlm_server_hosts) { |
Stanislav Kinsbursky | 27adadd | 2012-07-25 16:56:03 +0400 | [diff] [blame] | 661 | if (net && host->net != net) |
| 662 | continue; |
J. Bruce Fields | b113746 | 2010-12-14 15:05:03 +0000 | [diff] [blame] | 663 | if (atomic_read(&host->h_count) || host->h_inuse |
| 664 | || time_before(jiffies, host->h_expires)) { |
| 665 | dprintk("nlm_gc_hosts skipping %s " |
Stanislav Kinsbursky | 27adadd | 2012-07-25 16:56:03 +0400 | [diff] [blame] | 666 | "(cnt %d use %d exp %ld net %p)\n", |
J. Bruce Fields | b113746 | 2010-12-14 15:05:03 +0000 | [diff] [blame] | 667 | host->h_name, atomic_read(&host->h_count), |
Stanislav Kinsbursky | 27adadd | 2012-07-25 16:56:03 +0400 | [diff] [blame] | 668 | host->h_inuse, host->h_expires, host->net); |
J. Bruce Fields | b113746 | 2010-12-14 15:05:03 +0000 | [diff] [blame] | 669 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | } |
Chuck Lever | 723bb5b | 2010-12-14 15:05:33 +0000 | [diff] [blame] | 671 | nlm_destroy_host_locked(host); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | } |
| 673 | |
Stanislav Kinsbursky | 3cf7fb0 | 2012-07-25 16:56:11 +0400 | [diff] [blame] | 674 | if (net) { |
| 675 | struct lockd_net *ln = net_generic(net, lockd_net_id); |
| 676 | |
| 677 | ln->next_gc = jiffies + NLM_HOST_COLLECT; |
| 678 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | } |