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> |
| 18 | #include <linux/lockd/sm_inter.h> |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 19 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 21 | #include <net/ipv6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
| 23 | #define NLMDBG_FACILITY NLMDBG_HOSTCACHE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #define NLM_HOST_NRHASH 32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #define NLM_HOST_REBIND (60 * HZ) |
NeilBrown | 1447d25 | 2008-02-08 13:03:37 +1100 | [diff] [blame] | 26 | #define NLM_HOST_EXPIRE (300 * HZ) |
| 27 | #define NLM_HOST_COLLECT (120 * HZ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 29 | static struct hlist_head nlm_hosts[NLM_HOST_NRHASH]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | static unsigned long next_gc; |
| 31 | static int nrhosts; |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 32 | static DEFINE_MUTEX(nlm_host_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | static void nlm_gc_hosts(void); |
Chuck Lever | e018040 | 2008-09-03 14:36:23 -0400 | [diff] [blame] | 35 | static struct nsm_handle *nsm_find(const struct sockaddr *sap, |
| 36 | const size_t salen, |
Chuck Lever | bc48e4d | 2008-09-03 14:36:16 -0400 | [diff] [blame] | 37 | const char *hostname, |
| 38 | const size_t hostname_len, |
| 39 | const int create); |
Chuck Lever | c8c23c4 | 2008-12-04 14:21:31 -0500 | [diff] [blame^] | 40 | static void nsm_release(struct nsm_handle *nsm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 42 | struct nlm_lookup_host_info { |
| 43 | const int server; /* search for server|client */ |
Chuck Lever | 88541c8 | 2008-10-03 12:50:14 -0400 | [diff] [blame] | 44 | const struct sockaddr *sap; /* address to search for */ |
| 45 | const size_t salen; /* it's length */ |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 46 | const unsigned short protocol; /* transport to search for*/ |
| 47 | const u32 version; /* NLM version to search for */ |
| 48 | const char *hostname; /* remote's hostname */ |
| 49 | const size_t hostname_len; /* it's length */ |
Chuck Lever | 88541c8 | 2008-10-03 12:50:14 -0400 | [diff] [blame] | 50 | const struct sockaddr *src_sap; /* our address (optional) */ |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 51 | const size_t src_len; /* it's length */ |
Chuck Lever | 0cb2659 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 52 | const int noresvport; /* use non-priv port */ |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 53 | }; |
| 54 | |
Chuck Lever | ede2fea | 2008-09-03 14:36:08 -0400 | [diff] [blame] | 55 | /* |
| 56 | * Hash function must work well on big- and little-endian platforms |
| 57 | */ |
| 58 | static unsigned int __nlm_hash32(const __be32 n) |
| 59 | { |
| 60 | unsigned int hash = (__force u32)n ^ ((__force u32)n >> 16); |
| 61 | return hash ^ (hash >> 8); |
| 62 | } |
| 63 | |
| 64 | static unsigned int __nlm_hash_addr4(const struct sockaddr *sap) |
| 65 | { |
| 66 | const struct sockaddr_in *sin = (struct sockaddr_in *)sap; |
| 67 | return __nlm_hash32(sin->sin_addr.s_addr); |
| 68 | } |
| 69 | |
| 70 | static unsigned int __nlm_hash_addr6(const struct sockaddr *sap) |
| 71 | { |
| 72 | const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; |
| 73 | const struct in6_addr addr = sin6->sin6_addr; |
| 74 | return __nlm_hash32(addr.s6_addr32[0]) ^ |
| 75 | __nlm_hash32(addr.s6_addr32[1]) ^ |
| 76 | __nlm_hash32(addr.s6_addr32[2]) ^ |
| 77 | __nlm_hash32(addr.s6_addr32[3]); |
| 78 | } |
| 79 | |
| 80 | static unsigned int nlm_hash_address(const struct sockaddr *sap) |
| 81 | { |
| 82 | unsigned int hash; |
| 83 | |
| 84 | switch (sap->sa_family) { |
| 85 | case AF_INET: |
| 86 | hash = __nlm_hash_addr4(sap); |
| 87 | break; |
| 88 | case AF_INET6: |
| 89 | hash = __nlm_hash_addr6(sap); |
| 90 | break; |
| 91 | default: |
| 92 | hash = 0; |
| 93 | } |
| 94 | return hash & (NLM_HOST_NRHASH - 1); |
| 95 | } |
| 96 | |
Chuck Lever | 396cb3d | 2008-08-27 16:57:38 -0400 | [diff] [blame] | 97 | static void nlm_clear_port(struct sockaddr *sap) |
| 98 | { |
| 99 | switch (sap->sa_family) { |
| 100 | case AF_INET: |
| 101 | ((struct sockaddr_in *)sap)->sin_port = 0; |
| 102 | break; |
| 103 | case AF_INET6: |
| 104 | ((struct sockaddr_in6 *)sap)->sin6_port = 0; |
| 105 | break; |
| 106 | } |
| 107 | } |
| 108 | |
Chuck Lever | afb0369 | 2008-12-04 14:20:16 -0500 | [diff] [blame] | 109 | static void nlm_display_ipv4_address(const struct sockaddr *sap, char *buf, |
| 110 | const size_t len) |
| 111 | { |
| 112 | const struct sockaddr_in *sin = (struct sockaddr_in *)sap; |
| 113 | snprintf(buf, len, "%pI4", &sin->sin_addr.s_addr); |
| 114 | } |
| 115 | |
Chuck Lever | bc99580 | 2008-12-04 14:20:08 -0500 | [diff] [blame] | 116 | static void nlm_display_ipv6_address(const struct sockaddr *sap, char *buf, |
| 117 | const size_t len) |
| 118 | { |
| 119 | const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; |
| 120 | |
| 121 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
| 122 | snprintf(buf, len, "%pI4", &sin6->sin6_addr.s6_addr32[3]); |
| 123 | else if (sin6->sin6_scope_id != 0) |
| 124 | snprintf(buf, len, "%pI6%%%u", &sin6->sin6_addr, |
| 125 | sin6->sin6_scope_id); |
| 126 | else |
| 127 | snprintf(buf, len, "%pI6", &sin6->sin6_addr); |
| 128 | } |
| 129 | |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 130 | static void nlm_display_address(const struct sockaddr *sap, |
| 131 | char *buf, const size_t len) |
| 132 | { |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 133 | switch (sap->sa_family) { |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 134 | case AF_INET: |
Chuck Lever | afb0369 | 2008-12-04 14:20:16 -0500 | [diff] [blame] | 135 | nlm_display_ipv4_address(sap, buf, len); |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 136 | break; |
| 137 | case AF_INET6: |
Chuck Lever | bc99580 | 2008-12-04 14:20:08 -0500 | [diff] [blame] | 138 | nlm_display_ipv6_address(sap, buf, len); |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 139 | break; |
| 140 | default: |
| 141 | snprintf(buf, len, "unsupported address family"); |
| 142 | break; |
| 143 | } |
| 144 | } |
| 145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | /* |
| 147 | * Common host lookup routine for server & client |
| 148 | */ |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 149 | static struct nlm_host *nlm_lookup_host(struct nlm_lookup_host_info *ni) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | { |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 151 | struct hlist_head *chain; |
| 152 | struct hlist_node *pos; |
| 153 | struct nlm_host *host; |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 154 | struct nsm_handle *nsm = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 156 | mutex_lock(&nlm_host_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
| 158 | if (time_after_eq(jiffies, next_gc)) |
| 159 | nlm_gc_hosts(); |
| 160 | |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 161 | /* We may keep several nlm_host objects for a peer, because each |
| 162 | * nlm_host is identified by |
| 163 | * (address, protocol, version, server/client) |
| 164 | * We could probably simplify this a little by putting all those |
| 165 | * different NLM rpc_clients into one single nlm_host object. |
| 166 | * This would allow us to have one nlm_host per address. |
| 167 | */ |
Chuck Lever | 88541c8 | 2008-10-03 12:50:14 -0400 | [diff] [blame] | 168 | chain = &nlm_hosts[nlm_hash_address(ni->sap)]; |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 169 | hlist_for_each_entry(host, pos, chain, h_hash) { |
Chuck Lever | 88541c8 | 2008-10-03 12:50:14 -0400 | [diff] [blame] | 170 | if (!nlm_cmp_addr(nlm_addr(host), ni->sap)) |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 171 | continue; |
| 172 | |
| 173 | /* See if we have an NSM handle for this client */ |
NeilBrown | 6b54dae | 2006-10-04 02:16:15 -0700 | [diff] [blame] | 174 | if (!nsm) |
| 175 | nsm = host->h_nsmhandle; |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 176 | |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 177 | if (host->h_proto != ni->protocol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | continue; |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 179 | if (host->h_version != ni->version) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | continue; |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 181 | if (host->h_server != ni->server) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | continue; |
Chuck Lever | a8d82d9 | 2008-11-24 12:51:55 -0500 | [diff] [blame] | 183 | if (ni->server && |
| 184 | !nlm_cmp_addr(nlm_srcaddr(host), ni->src_sap)) |
Frank van Maarseveen | c98451b | 2007-07-09 22:25:29 +0200 | [diff] [blame] | 185 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 187 | /* Move to head of hash chain. */ |
| 188 | hlist_del(&host->h_hash); |
| 189 | hlist_add_head(&host->h_hash, chain); |
| 190 | |
Olaf Kirch | f0737a3 | 2006-10-04 02:15:54 -0700 | [diff] [blame] | 191 | nlm_get_host(host); |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 192 | dprintk("lockd: nlm_lookup_host found host %s (%s)\n", |
| 193 | host->h_name, host->h_addrbuf); |
Olaf Kirch | f0737a3 | 2006-10-04 02:15:54 -0700 | [diff] [blame] | 194 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | } |
Chuck Lever | c2526f4 | 2008-08-27 16:57:15 -0400 | [diff] [blame] | 196 | |
| 197 | /* |
| 198 | * The host wasn't in our hash table. If we don't |
| 199 | * have an NSM handle for it yet, create one. |
| 200 | */ |
NeilBrown | 6b54dae | 2006-10-04 02:16:15 -0700 | [diff] [blame] | 201 | if (nsm) |
| 202 | atomic_inc(&nsm->sm_count); |
Chuck Lever | c2526f4 | 2008-08-27 16:57:15 -0400 | [diff] [blame] | 203 | else { |
| 204 | host = NULL; |
Chuck Lever | 88541c8 | 2008-10-03 12:50:14 -0400 | [diff] [blame] | 205 | nsm = nsm_find(ni->sap, ni->salen, |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 206 | ni->hostname, ni->hostname_len, 1); |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 207 | if (!nsm) { |
| 208 | dprintk("lockd: nlm_lookup_host failed; " |
| 209 | "no nsm handle\n"); |
Chuck Lever | c2526f4 | 2008-08-27 16:57:15 -0400 | [diff] [blame] | 210 | goto out; |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 211 | } |
Chuck Lever | c2526f4 | 2008-08-27 16:57:15 -0400 | [diff] [blame] | 212 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 214 | host = kzalloc(sizeof(*host), GFP_KERNEL); |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 215 | if (!host) { |
| 216 | nsm_release(nsm); |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 217 | dprintk("lockd: nlm_lookup_host failed; no memory\n"); |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 218 | goto out; |
| 219 | } |
| 220 | host->h_name = nsm->sm_name; |
Chuck Lever | 1df40b6 | 2008-12-04 14:19:53 -0500 | [diff] [blame] | 221 | host->h_addrbuf = nsm->sm_addrbuf; |
Chuck Lever | 88541c8 | 2008-10-03 12:50:14 -0400 | [diff] [blame] | 222 | memcpy(nlm_addr(host), ni->sap, ni->salen); |
| 223 | host->h_addrlen = ni->salen; |
Chuck Lever | b4ed58f | 2008-09-03 14:35:39 -0400 | [diff] [blame] | 224 | nlm_clear_port(nlm_addr(host)); |
Chuck Lever | 88541c8 | 2008-10-03 12:50:14 -0400 | [diff] [blame] | 225 | memcpy(nlm_srcaddr(host), ni->src_sap, ni->src_len); |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 226 | host->h_version = ni->version; |
| 227 | host->h_proto = ni->protocol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | host->h_rpcclnt = NULL; |
Trond Myklebust | 5046791 | 2006-06-09 09:40:24 -0400 | [diff] [blame] | 229 | mutex_init(&host->h_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
| 231 | host->h_expires = jiffies + NLM_HOST_EXPIRE; |
| 232 | atomic_set(&host->h_count, 1); |
| 233 | init_waitqueue_head(&host->h_gracewait); |
Trond Myklebust | 28df955 | 2006-06-09 09:40:27 -0400 | [diff] [blame] | 234 | init_rwsem(&host->h_rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | host->h_state = 0; /* pseudo NSM state */ |
| 236 | host->h_nsmstate = 0; /* real NSM state */ |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 237 | host->h_nsmhandle = nsm; |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 238 | host->h_server = ni->server; |
Chuck Lever | 0cb2659 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 239 | host->h_noresvport = ni->noresvport; |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 240 | hlist_add_head(&host->h_hash, chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | INIT_LIST_HEAD(&host->h_lockowners); |
| 242 | spin_lock_init(&host->h_lock); |
Christoph Hellwig | 26bcbf9 | 2006-03-20 13:44:40 -0500 | [diff] [blame] | 243 | INIT_LIST_HEAD(&host->h_granted); |
| 244 | INIT_LIST_HEAD(&host->h_reclaim); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
NeilBrown | 1447d25 | 2008-02-08 13:03:37 +1100 | [diff] [blame] | 246 | nrhosts++; |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 247 | |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 248 | dprintk("lockd: nlm_lookup_host created host %s\n", |
| 249 | host->h_name); |
| 250 | |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 251 | out: |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 252 | mutex_unlock(&nlm_host_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | return host; |
| 254 | } |
| 255 | |
Olaf Kirch | c53c1bb | 2006-10-04 02:16:00 -0700 | [diff] [blame] | 256 | /* |
| 257 | * Destroy a host |
| 258 | */ |
| 259 | static void |
| 260 | nlm_destroy_host(struct nlm_host *host) |
| 261 | { |
| 262 | struct rpc_clnt *clnt; |
| 263 | |
| 264 | BUG_ON(!list_empty(&host->h_lockowners)); |
| 265 | BUG_ON(atomic_read(&host->h_count)); |
| 266 | |
Olaf Kirch | c53c1bb | 2006-10-04 02:16:00 -0700 | [diff] [blame] | 267 | nsm_unmonitor(host); |
Chuck Lever | c8c23c4 | 2008-12-04 14:21:31 -0500 | [diff] [blame^] | 268 | nsm_release(host->h_nsmhandle); |
Olaf Kirch | c53c1bb | 2006-10-04 02:16:00 -0700 | [diff] [blame] | 269 | |
Trond Myklebust | 34f52e3 | 2007-06-14 16:40:31 -0400 | [diff] [blame] | 270 | clnt = host->h_rpcclnt; |
| 271 | if (clnt != NULL) |
| 272 | rpc_shutdown_client(clnt); |
Olaf Kirch | c53c1bb | 2006-10-04 02:16:00 -0700 | [diff] [blame] | 273 | kfree(host); |
| 274 | } |
| 275 | |
Chuck Lever | d7d2044 | 2008-10-03 12:50:21 -0400 | [diff] [blame] | 276 | /** |
| 277 | * nlmclnt_lookup_host - Find an NLM host handle matching a remote server |
| 278 | * @sap: network address of server |
| 279 | * @salen: length of server address |
| 280 | * @protocol: transport protocol to use |
| 281 | * @version: NLM protocol version |
| 282 | * @hostname: '\0'-terminated hostname of server |
Chuck Lever | 0cb2659 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 283 | * @noresvport: 1 if non-privileged port should be used |
Chuck Lever | d7d2044 | 2008-10-03 12:50:21 -0400 | [diff] [blame] | 284 | * |
| 285 | * Returns an nlm_host structure that matches the passed-in |
| 286 | * [server address, transport protocol, NLM version, server hostname]. |
| 287 | * If one doesn't already exist in the host cache, a new handle is |
| 288 | * created and returned. |
Adrian Bunk | c585646 | 2006-12-06 20:38:29 -0800 | [diff] [blame] | 289 | */ |
Chuck Lever | d7d2044 | 2008-10-03 12:50:21 -0400 | [diff] [blame] | 290 | struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap, |
| 291 | const size_t salen, |
| 292 | const unsigned short protocol, |
Chuck Lever | 0cb2659 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 293 | const u32 version, |
| 294 | const char *hostname, |
| 295 | int noresvport) |
Adrian Bunk | c585646 | 2006-12-06 20:38:29 -0800 | [diff] [blame] | 296 | { |
Chuck Lever | 88541c8 | 2008-10-03 12:50:14 -0400 | [diff] [blame] | 297 | const struct sockaddr source = { |
| 298 | .sa_family = AF_UNSPEC, |
Chuck Lever | 2860a02 | 2008-08-27 16:57:31 -0400 | [diff] [blame] | 299 | }; |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 300 | struct nlm_lookup_host_info ni = { |
| 301 | .server = 0, |
Chuck Lever | d7d2044 | 2008-10-03 12:50:21 -0400 | [diff] [blame] | 302 | .sap = sap, |
| 303 | .salen = salen, |
| 304 | .protocol = protocol, |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 305 | .version = version, |
| 306 | .hostname = hostname, |
Chuck Lever | d7d2044 | 2008-10-03 12:50:21 -0400 | [diff] [blame] | 307 | .hostname_len = strlen(hostname), |
Chuck Lever | 88541c8 | 2008-10-03 12:50:14 -0400 | [diff] [blame] | 308 | .src_sap = &source, |
| 309 | .src_len = sizeof(source), |
Chuck Lever | 0cb2659 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 310 | .noresvport = noresvport, |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 311 | }; |
Frank van Maarseveen | c98451b | 2007-07-09 22:25:29 +0200 | [diff] [blame] | 312 | |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 313 | dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__, |
| 314 | (hostname ? hostname : "<none>"), version, |
Chuck Lever | d7d2044 | 2008-10-03 12:50:21 -0400 | [diff] [blame] | 315 | (protocol == IPPROTO_UDP ? "udp" : "tcp")); |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 316 | |
| 317 | return nlm_lookup_host(&ni); |
Adrian Bunk | c585646 | 2006-12-06 20:38:29 -0800 | [diff] [blame] | 318 | } |
| 319 | |
Chuck Lever | 6bfbe8a | 2008-10-03 12:50:29 -0400 | [diff] [blame] | 320 | /** |
| 321 | * nlmsvc_lookup_host - Find an NLM host handle matching a remote client |
| 322 | * @rqstp: incoming NLM request |
| 323 | * @hostname: name of client host |
| 324 | * @hostname_len: length of client hostname |
| 325 | * |
| 326 | * Returns an nlm_host structure that matches the [client address, |
| 327 | * transport protocol, NLM version, client hostname] of the passed-in |
| 328 | * NLM request. If one doesn't already exist in the host cache, a |
| 329 | * new handle is created and returned. |
| 330 | * |
| 331 | * Before possibly creating a new nlm_host, construct a sockaddr |
| 332 | * for a specific source address in case the local system has |
| 333 | * multiple network addresses. The family of the address in |
| 334 | * rq_daddr is guaranteed to be the same as the family of the |
| 335 | * address in rq_addr, so it's safe to use the same family for |
| 336 | * the source address. |
Adrian Bunk | c585646 | 2006-12-06 20:38:29 -0800 | [diff] [blame] | 337 | */ |
Chuck Lever | 6bfbe8a | 2008-10-03 12:50:29 -0400 | [diff] [blame] | 338 | struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp, |
| 339 | const char *hostname, |
| 340 | const size_t hostname_len) |
Adrian Bunk | c585646 | 2006-12-06 20:38:29 -0800 | [diff] [blame] | 341 | { |
Chuck Lever | 6bfbe8a | 2008-10-03 12:50:29 -0400 | [diff] [blame] | 342 | struct sockaddr_in sin = { |
Chuck Lever | 2860a02 | 2008-08-27 16:57:31 -0400 | [diff] [blame] | 343 | .sin_family = AF_INET, |
Chuck Lever | 6bfbe8a | 2008-10-03 12:50:29 -0400 | [diff] [blame] | 344 | }; |
| 345 | struct sockaddr_in6 sin6 = { |
| 346 | .sin6_family = AF_INET6, |
Chuck Lever | 2860a02 | 2008-08-27 16:57:31 -0400 | [diff] [blame] | 347 | }; |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 348 | struct nlm_lookup_host_info ni = { |
| 349 | .server = 1, |
Chuck Lever | 88541c8 | 2008-10-03 12:50:14 -0400 | [diff] [blame] | 350 | .sap = svc_addr(rqstp), |
| 351 | .salen = rqstp->rq_addrlen, |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 352 | .protocol = rqstp->rq_prot, |
| 353 | .version = rqstp->rq_vers, |
| 354 | .hostname = hostname, |
| 355 | .hostname_len = hostname_len, |
Chuck Lever | 6bfbe8a | 2008-10-03 12:50:29 -0400 | [diff] [blame] | 356 | .src_len = rqstp->rq_addrlen, |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 357 | }; |
Frank van Maarseveen | c98451b | 2007-07-09 22:25:29 +0200 | [diff] [blame] | 358 | |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 359 | dprintk("lockd: %s(host='%*s', vers=%u, proto=%s)\n", __func__, |
| 360 | (int)hostname_len, hostname, rqstp->rq_vers, |
| 361 | (rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp")); |
| 362 | |
Chuck Lever | 6bfbe8a | 2008-10-03 12:50:29 -0400 | [diff] [blame] | 363 | switch (ni.sap->sa_family) { |
| 364 | case AF_INET: |
| 365 | sin.sin_addr.s_addr = rqstp->rq_daddr.addr.s_addr; |
| 366 | ni.src_sap = (struct sockaddr *)&sin; |
| 367 | break; |
| 368 | case AF_INET6: |
| 369 | ipv6_addr_copy(&sin6.sin6_addr, &rqstp->rq_daddr.addr6); |
| 370 | ni.src_sap = (struct sockaddr *)&sin6; |
| 371 | break; |
| 372 | default: |
| 373 | return NULL; |
| 374 | } |
| 375 | |
Chuck Lever | 7f1ed18 | 2008-10-03 12:50:07 -0400 | [diff] [blame] | 376 | return nlm_lookup_host(&ni); |
Adrian Bunk | c585646 | 2006-12-06 20:38:29 -0800 | [diff] [blame] | 377 | } |
| 378 | |
| 379 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | * Create the NLM RPC client for an NLM peer |
| 381 | */ |
| 382 | struct rpc_clnt * |
| 383 | nlm_bind_host(struct nlm_host *host) |
| 384 | { |
| 385 | struct rpc_clnt *clnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
Chuck Lever | 1df40b6 | 2008-12-04 14:19:53 -0500 | [diff] [blame] | 387 | dprintk("lockd: nlm_bind_host %s (%s)\n", |
| 388 | host->h_name, host->h_addrbuf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | |
| 390 | /* Lock host handle */ |
Trond Myklebust | 5046791 | 2006-06-09 09:40:24 -0400 | [diff] [blame] | 391 | mutex_lock(&host->h_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
| 393 | /* If we've already created an RPC client, check whether |
| 394 | * RPC rebind is required |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | */ |
| 396 | if ((clnt = host->h_rpcclnt) != NULL) { |
Chuck Lever | 43118c2 | 2005-08-25 16:25:49 -0700 | [diff] [blame] | 397 | if (time_after_eq(jiffies, host->h_nextrebind)) { |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 398 | rpc_force_rebind(clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 400 | dprintk("lockd: next rebind in %lu jiffies\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | host->h_nextrebind - jiffies); |
| 402 | } |
| 403 | } else { |
Trond Myklebust | 21051ba | 2007-05-14 16:50:44 -0400 | [diff] [blame] | 404 | unsigned long increment = nlmsvc_timeout; |
Chuck Lever | e1ec789 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 405 | struct rpc_timeout timeparms = { |
| 406 | .to_initval = increment, |
| 407 | .to_increment = increment, |
| 408 | .to_maxval = increment * 6UL, |
| 409 | .to_retries = 5U, |
| 410 | }; |
| 411 | struct rpc_create_args args = { |
| 412 | .protocol = host->h_proto, |
Chuck Lever | b4ed58f | 2008-09-03 14:35:39 -0400 | [diff] [blame] | 413 | .address = nlm_addr(host), |
| 414 | .addrsize = host->h_addrlen, |
Chuck Lever | 90151e6 | 2008-09-03 14:35:46 -0400 | [diff] [blame] | 415 | .saddress = nlm_srcaddr(host), |
Chuck Lever | e1ec789 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 416 | .timeout = &timeparms, |
| 417 | .servername = host->h_name, |
| 418 | .program = &nlm_program, |
| 419 | .version = host->h_version, |
| 420 | .authflavor = RPC_AUTH_UNIX, |
Jeff Layton | 90bd17c | 2008-02-06 11:34:11 -0500 | [diff] [blame] | 421 | .flags = (RPC_CLNT_CREATE_NOPING | |
Chuck Lever | e1ec789 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 422 | RPC_CLNT_CREATE_AUTOBIND), |
| 423 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
Jeff Layton | 90bd17c | 2008-02-06 11:34:11 -0500 | [diff] [blame] | 425 | /* |
| 426 | * lockd retries server side blocks automatically so we want |
| 427 | * those to be soft RPC calls. Client side calls need to be |
| 428 | * hard RPC tasks. |
| 429 | */ |
| 430 | if (!host->h_server) |
| 431 | args.flags |= RPC_CLNT_CREATE_HARDRTRY; |
Chuck Lever | 0cb2659 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 432 | if (host->h_noresvport) |
| 433 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; |
Jeff Layton | 90bd17c | 2008-02-06 11:34:11 -0500 | [diff] [blame] | 434 | |
Chuck Lever | e1ec789 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 435 | clnt = rpc_create(&args); |
| 436 | if (!IS_ERR(clnt)) |
| 437 | host->h_rpcclnt = clnt; |
| 438 | else { |
| 439 | printk("lockd: couldn't create RPC handle for %s\n", host->h_name); |
| 440 | clnt = NULL; |
| 441 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
| 443 | |
Trond Myklebust | 5046791 | 2006-06-09 09:40:24 -0400 | [diff] [blame] | 444 | mutex_unlock(&host->h_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | return clnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | } |
| 447 | |
| 448 | /* |
| 449 | * Force a portmap lookup of the remote lockd port |
| 450 | */ |
| 451 | void |
| 452 | nlm_rebind_host(struct nlm_host *host) |
| 453 | { |
| 454 | dprintk("lockd: rebind host %s\n", host->h_name); |
| 455 | if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) { |
Chuck Lever | 35f5a42 | 2006-01-03 09:55:50 +0100 | [diff] [blame] | 456 | rpc_force_rebind(host->h_rpcclnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | /* |
| 462 | * Increment NLM host count |
| 463 | */ |
| 464 | struct nlm_host * nlm_get_host(struct nlm_host *host) |
| 465 | { |
| 466 | if (host) { |
| 467 | dprintk("lockd: get host %s\n", host->h_name); |
| 468 | atomic_inc(&host->h_count); |
| 469 | host->h_expires = jiffies + NLM_HOST_EXPIRE; |
| 470 | } |
| 471 | return host; |
| 472 | } |
| 473 | |
| 474 | /* |
| 475 | * Release NLM host after use |
| 476 | */ |
| 477 | void nlm_release_host(struct nlm_host *host) |
| 478 | { |
| 479 | if (host != NULL) { |
| 480 | dprintk("lockd: release host %s\n", host->h_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | BUG_ON(atomic_read(&host->h_count) < 0); |
Trond Myklebust | 4c060b5 | 2006-03-20 13:44:41 -0500 | [diff] [blame] | 482 | if (atomic_dec_and_test(&host->h_count)) { |
| 483 | BUG_ON(!list_empty(&host->h_lockowners)); |
| 484 | BUG_ON(!list_empty(&host->h_granted)); |
| 485 | BUG_ON(!list_empty(&host->h_reclaim)); |
| 486 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | } |
| 488 | } |
| 489 | |
| 490 | /* |
Olaf Kirch | cf712c2 | 2006-10-04 02:15:52 -0700 | [diff] [blame] | 491 | * We were notified that the host indicated by address &sin |
| 492 | * has rebooted. |
| 493 | * Release all resources held by that peer. |
| 494 | */ |
Olaf Kirch | 5c8dd29 | 2006-10-04 02:15:55 -0700 | [diff] [blame] | 495 | void nlm_host_rebooted(const struct sockaddr_in *sin, |
Chuck Lever | 48df020 | 2007-11-01 16:56:53 -0400 | [diff] [blame] | 496 | const char *hostname, |
| 497 | unsigned int hostname_len, |
Olaf Kirch | 5c8dd29 | 2006-10-04 02:15:55 -0700 | [diff] [blame] | 498 | u32 new_state) |
Olaf Kirch | cf712c2 | 2006-10-04 02:15:52 -0700 | [diff] [blame] | 499 | { |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 500 | struct hlist_head *chain; |
| 501 | struct hlist_node *pos; |
Olaf Kirch | 5c8dd29 | 2006-10-04 02:15:55 -0700 | [diff] [blame] | 502 | struct nsm_handle *nsm; |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 503 | struct nlm_host *host; |
Olaf Kirch | cf712c2 | 2006-10-04 02:15:52 -0700 | [diff] [blame] | 504 | |
Chuck Lever | e018040 | 2008-09-03 14:36:23 -0400 | [diff] [blame] | 505 | nsm = nsm_find((struct sockaddr *)sin, sizeof(*sin), |
| 506 | hostname, hostname_len, 0); |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 507 | if (nsm == NULL) { |
| 508 | dprintk("lockd: never saw rebooted peer '%.*s' before\n", |
| 509 | hostname_len, hostname); |
Olaf Kirch | db4e4c9 | 2006-10-04 02:15:52 -0700 | [diff] [blame] | 510 | return; |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 511 | } |
| 512 | |
| 513 | dprintk("lockd: nlm_host_rebooted(%.*s, %s)\n", |
| 514 | hostname_len, hostname, nsm->sm_addrbuf); |
Olaf Kirch | db4e4c9 | 2006-10-04 02:15:52 -0700 | [diff] [blame] | 515 | |
Olaf Kirch | 5c8dd29 | 2006-10-04 02:15:55 -0700 | [diff] [blame] | 516 | /* When reclaiming locks on this peer, make sure that |
| 517 | * we set up a new notification */ |
| 518 | nsm->sm_monitored = 0; |
| 519 | |
| 520 | /* Mark all hosts tied to this NSM state as having rebooted. |
| 521 | * We run the loop repeatedly, because we drop the host table |
| 522 | * lock for this. |
| 523 | * To avoid processing a host several times, we match the nsmstate. |
| 524 | */ |
| 525 | again: mutex_lock(&nlm_host_mutex); |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 526 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
| 527 | hlist_for_each_entry(host, pos, chain, h_hash) { |
Olaf Kirch | 5c8dd29 | 2006-10-04 02:15:55 -0700 | [diff] [blame] | 528 | if (host->h_nsmhandle == nsm |
| 529 | && host->h_nsmstate != new_state) { |
| 530 | host->h_nsmstate = new_state; |
| 531 | host->h_state++; |
| 532 | |
| 533 | nlm_get_host(host); |
| 534 | mutex_unlock(&nlm_host_mutex); |
| 535 | |
| 536 | if (host->h_server) { |
| 537 | /* We're server for this guy, just ditch |
| 538 | * all the locks he held. */ |
| 539 | nlmsvc_free_host_resources(host); |
| 540 | } else { |
| 541 | /* He's the server, initiate lock recovery. */ |
| 542 | nlmclnt_recovery(host); |
| 543 | } |
| 544 | |
| 545 | nlm_release_host(host); |
| 546 | goto again; |
| 547 | } |
| 548 | } |
Olaf Kirch | cf712c2 | 2006-10-04 02:15:52 -0700 | [diff] [blame] | 549 | } |
Olaf Kirch | 5c8dd29 | 2006-10-04 02:15:55 -0700 | [diff] [blame] | 550 | |
| 551 | mutex_unlock(&nlm_host_mutex); |
Olaf Kirch | cf712c2 | 2006-10-04 02:15:52 -0700 | [diff] [blame] | 552 | } |
| 553 | |
| 554 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | * Shut down the hosts module. |
| 556 | * Note that this routine is called only at server shutdown time. |
| 557 | */ |
| 558 | void |
| 559 | nlm_shutdown_hosts(void) |
| 560 | { |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 561 | struct hlist_head *chain; |
| 562 | struct hlist_node *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | struct nlm_host *host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | |
| 565 | dprintk("lockd: shutting down host module\n"); |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 566 | mutex_lock(&nlm_host_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
| 568 | /* First, make all hosts eligible for gc */ |
| 569 | dprintk("lockd: nuking all hosts...\n"); |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 570 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
Jeff Layton | d801b86 | 2008-01-29 10:30:55 -0500 | [diff] [blame] | 571 | hlist_for_each_entry(host, pos, chain, h_hash) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | host->h_expires = jiffies - 1; |
Jeff Layton | d801b86 | 2008-01-29 10:30:55 -0500 | [diff] [blame] | 573 | if (host->h_rpcclnt) { |
| 574 | rpc_shutdown_client(host->h_rpcclnt); |
| 575 | host->h_rpcclnt = NULL; |
| 576 | } |
| 577 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | } |
| 579 | |
| 580 | /* Then, perform a garbage collection pass */ |
| 581 | nlm_gc_hosts(); |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 582 | mutex_unlock(&nlm_host_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
| 584 | /* complain if any hosts are left */ |
| 585 | if (nrhosts) { |
| 586 | printk(KERN_WARNING "lockd: couldn't shutdown host module!\n"); |
| 587 | dprintk("lockd: %d hosts left:\n", nrhosts); |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 588 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
| 589 | hlist_for_each_entry(host, pos, chain, h_hash) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | dprintk(" %s (cnt %d use %d exp %ld)\n", |
| 591 | host->h_name, atomic_read(&host->h_count), |
| 592 | host->h_inuse, host->h_expires); |
| 593 | } |
| 594 | } |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | /* |
| 599 | * Garbage collect any unused NLM hosts. |
| 600 | * This GC combines reference counting for async operations with |
| 601 | * mark & sweep for resources held by remote clients. |
| 602 | */ |
| 603 | static void |
| 604 | nlm_gc_hosts(void) |
| 605 | { |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 606 | struct hlist_head *chain; |
| 607 | struct hlist_node *pos, *next; |
| 608 | struct nlm_host *host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
| 610 | dprintk("lockd: host garbage collection\n"); |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 611 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
| 612 | hlist_for_each_entry(host, pos, chain, h_hash) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | host->h_inuse = 0; |
| 614 | } |
| 615 | |
| 616 | /* Mark all hosts that hold locks, blocks or shares */ |
| 617 | nlmsvc_mark_resources(); |
| 618 | |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 619 | for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { |
| 620 | hlist_for_each_entry_safe(host, pos, next, chain, h_hash) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | if (atomic_read(&host->h_count) || host->h_inuse |
| 622 | || time_before(jiffies, host->h_expires)) { |
| 623 | dprintk("nlm_gc_hosts skipping %s (cnt %d use %d exp %ld)\n", |
| 624 | host->h_name, atomic_read(&host->h_count), |
| 625 | host->h_inuse, host->h_expires); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | continue; |
| 627 | } |
| 628 | dprintk("lockd: delete host %s\n", host->h_name); |
Olaf Kirch | 0cea327 | 2006-10-04 02:15:56 -0700 | [diff] [blame] | 629 | hlist_del_init(&host->h_hash); |
Olaf Kirch | 977faf3 | 2006-10-04 02:15:51 -0700 | [diff] [blame] | 630 | |
Olaf Kirch | c53c1bb | 2006-10-04 02:16:00 -0700 | [diff] [blame] | 631 | nlm_destroy_host(host); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | nrhosts--; |
| 633 | } |
| 634 | } |
| 635 | |
| 636 | next_gc = jiffies + NLM_HOST_COLLECT; |
| 637 | } |
| 638 | |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 639 | |
| 640 | /* |
| 641 | * Manage NSM handles |
| 642 | */ |
| 643 | static LIST_HEAD(nsm_handles); |
J. Bruce Fields | d842120 | 2008-02-20 15:40:15 -0500 | [diff] [blame] | 644 | static DEFINE_SPINLOCK(nsm_lock); |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 645 | |
Chuck Lever | e018040 | 2008-09-03 14:36:23 -0400 | [diff] [blame] | 646 | static struct nsm_handle *nsm_find(const struct sockaddr *sap, |
| 647 | const size_t salen, |
Chuck Lever | bc48e4d | 2008-09-03 14:36:16 -0400 | [diff] [blame] | 648 | const char *hostname, |
| 649 | const size_t hostname_len, |
| 650 | const int create) |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 651 | { |
| 652 | struct nsm_handle *nsm = NULL; |
J. Bruce Fields | a95e56e | 2008-02-20 15:27:31 -0500 | [diff] [blame] | 653 | struct nsm_handle *pos; |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 654 | |
Chuck Lever | e018040 | 2008-09-03 14:36:23 -0400 | [diff] [blame] | 655 | if (!sap) |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 656 | return NULL; |
| 657 | |
| 658 | if (hostname && memchr(hostname, '/', hostname_len) != NULL) { |
| 659 | if (printk_ratelimit()) { |
| 660 | printk(KERN_WARNING "Invalid hostname \"%.*s\" " |
| 661 | "in NFS lock request\n", |
Chuck Lever | bc48e4d | 2008-09-03 14:36:16 -0400 | [diff] [blame] | 662 | (int)hostname_len, hostname); |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 663 | } |
| 664 | return NULL; |
| 665 | } |
| 666 | |
J. Bruce Fields | d842120 | 2008-02-20 15:40:15 -0500 | [diff] [blame] | 667 | retry: |
| 668 | spin_lock(&nsm_lock); |
J. Bruce Fields | a95e56e | 2008-02-20 15:27:31 -0500 | [diff] [blame] | 669 | list_for_each_entry(pos, &nsm_handles, sm_link) { |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 670 | |
Olaf Kirch | abd1f50 | 2006-10-04 02:16:01 -0700 | [diff] [blame] | 671 | if (hostname && nsm_use_hostnames) { |
J. Bruce Fields | a95e56e | 2008-02-20 15:27:31 -0500 | [diff] [blame] | 672 | if (strlen(pos->sm_name) != hostname_len |
| 673 | || memcmp(pos->sm_name, hostname, hostname_len)) |
Olaf Kirch | abd1f50 | 2006-10-04 02:16:01 -0700 | [diff] [blame] | 674 | continue; |
Chuck Lever | e018040 | 2008-09-03 14:36:23 -0400 | [diff] [blame] | 675 | } else if (!nlm_cmp_addr(nsm_addr(pos), sap)) |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 676 | continue; |
J. Bruce Fields | a95e56e | 2008-02-20 15:27:31 -0500 | [diff] [blame] | 677 | atomic_inc(&pos->sm_count); |
J. Bruce Fields | d842120 | 2008-02-20 15:40:15 -0500 | [diff] [blame] | 678 | kfree(nsm); |
J. Bruce Fields | a95e56e | 2008-02-20 15:27:31 -0500 | [diff] [blame] | 679 | nsm = pos; |
J. Bruce Fields | d842120 | 2008-02-20 15:40:15 -0500 | [diff] [blame] | 680 | goto found; |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 681 | } |
J. Bruce Fields | d842120 | 2008-02-20 15:40:15 -0500 | [diff] [blame] | 682 | if (nsm) { |
| 683 | list_add(&nsm->sm_link, &nsm_handles); |
| 684 | goto found; |
| 685 | } |
| 686 | spin_unlock(&nsm_lock); |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 687 | |
J. Bruce Fields | d842120 | 2008-02-20 15:40:15 -0500 | [diff] [blame] | 688 | if (!create) |
| 689 | return NULL; |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 690 | |
| 691 | nsm = kzalloc(sizeof(*nsm) + hostname_len + 1, GFP_KERNEL); |
J. Bruce Fields | a95e56e | 2008-02-20 15:27:31 -0500 | [diff] [blame] | 692 | if (nsm == NULL) |
J. Bruce Fields | d842120 | 2008-02-20 15:40:15 -0500 | [diff] [blame] | 693 | return NULL; |
| 694 | |
Chuck Lever | e018040 | 2008-09-03 14:36:23 -0400 | [diff] [blame] | 695 | memcpy(nsm_addr(nsm), sap, salen); |
| 696 | nsm->sm_addrlen = salen; |
J. Bruce Fields | a95e56e | 2008-02-20 15:27:31 -0500 | [diff] [blame] | 697 | nsm->sm_name = (char *) (nsm + 1); |
| 698 | memcpy(nsm->sm_name, hostname, hostname_len); |
| 699 | nsm->sm_name[hostname_len] = '\0'; |
Chuck Lever | 1b333c5 | 2008-08-27 16:57:23 -0400 | [diff] [blame] | 700 | nlm_display_address((struct sockaddr *)&nsm->sm_addr, |
| 701 | nsm->sm_addrbuf, sizeof(nsm->sm_addrbuf)); |
J. Bruce Fields | a95e56e | 2008-02-20 15:27:31 -0500 | [diff] [blame] | 702 | atomic_set(&nsm->sm_count, 1); |
J. Bruce Fields | d842120 | 2008-02-20 15:40:15 -0500 | [diff] [blame] | 703 | goto retry; |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 704 | |
J. Bruce Fields | d842120 | 2008-02-20 15:40:15 -0500 | [diff] [blame] | 705 | found: |
| 706 | spin_unlock(&nsm_lock); |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 707 | return nsm; |
| 708 | } |
| 709 | |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 710 | /* |
| 711 | * Release an NSM handle |
| 712 | */ |
Chuck Lever | c8c23c4 | 2008-12-04 14:21:31 -0500 | [diff] [blame^] | 713 | static void nsm_release(struct nsm_handle *nsm) |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 714 | { |
| 715 | if (!nsm) |
| 716 | return; |
J. Bruce Fields | d842120 | 2008-02-20 15:40:15 -0500 | [diff] [blame] | 717 | if (atomic_dec_and_lock(&nsm->sm_count, &nsm_lock)) { |
J. Bruce Fields | 164f98a | 2008-02-20 14:02:47 -0500 | [diff] [blame] | 718 | list_del(&nsm->sm_link); |
J. Bruce Fields | d842120 | 2008-02-20 15:40:15 -0500 | [diff] [blame] | 719 | spin_unlock(&nsm_lock); |
J. Bruce Fields | 164f98a | 2008-02-20 14:02:47 -0500 | [diff] [blame] | 720 | kfree(nsm); |
Olaf Kirch | 8dead0d | 2006-10-04 02:15:53 -0700 | [diff] [blame] | 721 | } |
| 722 | } |