Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/net/sunrpc/svc.c |
| 3 | * |
| 4 | * High-level RPC service routines |
| 5 | * |
| 6 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 7 | * |
| 8 | * Multiple threads pools and NUMAisation |
| 9 | * Copyright (c) 2006 Silicon Graphics, Inc. |
| 10 | * by Greg Banks <gnb@melbourne.sgi.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
| 12 | |
| 13 | #include <linux/linkage.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/net.h> |
| 17 | #include <linux/in.h> |
| 18 | #include <linux/mm.h> |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/module.h> |
travis@sgi.com | df3825c | 2008-01-30 13:33:11 +0100 | [diff] [blame] | 21 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
| 23 | #include <linux/sunrpc/types.h> |
| 24 | #include <linux/sunrpc/xdr.h> |
| 25 | #include <linux/sunrpc/stats.h> |
| 26 | #include <linux/sunrpc/svcsock.h> |
| 27 | #include <linux/sunrpc/clnt.h> |
| 28 | |
| 29 | #define RPCDBG_FACILITY RPCDBG_SVCDSP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 31 | #define svc_serv_is_pooled(serv) ((serv)->sv_function) |
| 32 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | /* |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 34 | * Mode for mapping cpus to pools. |
| 35 | */ |
| 36 | enum { |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 37 | SVC_POOL_AUTO = -1, /* choose one of the others */ |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 38 | SVC_POOL_GLOBAL, /* no mapping, just a single global pool |
| 39 | * (legacy & UP mode) */ |
| 40 | SVC_POOL_PERCPU, /* one pool per cpu */ |
| 41 | SVC_POOL_PERNODE /* one pool per numa node */ |
| 42 | }; |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 43 | #define SVC_POOL_DEFAULT SVC_POOL_GLOBAL |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 44 | |
| 45 | /* |
| 46 | * Structure for mapping cpus to pools and vice versa. |
| 47 | * Setup once during sunrpc initialisation. |
| 48 | */ |
| 49 | static struct svc_pool_map { |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 50 | int count; /* How many svc_servs use us */ |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 51 | int mode; /* Note: int not enum to avoid |
| 52 | * warnings about "enumeration value |
| 53 | * not handled in switch" */ |
| 54 | unsigned int npools; |
| 55 | unsigned int *pool_to; /* maps pool id to cpu or node */ |
| 56 | unsigned int *to_pool; /* maps cpu or node to pool id */ |
| 57 | } svc_pool_map = { |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 58 | .count = 0, |
| 59 | .mode = SVC_POOL_DEFAULT |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 60 | }; |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 61 | static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */ |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 62 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 63 | static int |
| 64 | param_set_pool_mode(const char *val, struct kernel_param *kp) |
| 65 | { |
| 66 | int *ip = (int *)kp->arg; |
| 67 | struct svc_pool_map *m = &svc_pool_map; |
| 68 | int err; |
| 69 | |
| 70 | mutex_lock(&svc_pool_map_mutex); |
| 71 | |
| 72 | err = -EBUSY; |
| 73 | if (m->count) |
| 74 | goto out; |
| 75 | |
| 76 | err = 0; |
| 77 | if (!strncmp(val, "auto", 4)) |
| 78 | *ip = SVC_POOL_AUTO; |
| 79 | else if (!strncmp(val, "global", 6)) |
| 80 | *ip = SVC_POOL_GLOBAL; |
| 81 | else if (!strncmp(val, "percpu", 6)) |
| 82 | *ip = SVC_POOL_PERCPU; |
| 83 | else if (!strncmp(val, "pernode", 7)) |
| 84 | *ip = SVC_POOL_PERNODE; |
| 85 | else |
| 86 | err = -EINVAL; |
| 87 | |
| 88 | out: |
| 89 | mutex_unlock(&svc_pool_map_mutex); |
| 90 | return err; |
| 91 | } |
| 92 | |
| 93 | static int |
| 94 | param_get_pool_mode(char *buf, struct kernel_param *kp) |
| 95 | { |
| 96 | int *ip = (int *)kp->arg; |
| 97 | |
| 98 | switch (*ip) |
| 99 | { |
| 100 | case SVC_POOL_AUTO: |
| 101 | return strlcpy(buf, "auto", 20); |
| 102 | case SVC_POOL_GLOBAL: |
| 103 | return strlcpy(buf, "global", 20); |
| 104 | case SVC_POOL_PERCPU: |
| 105 | return strlcpy(buf, "percpu", 20); |
| 106 | case SVC_POOL_PERNODE: |
| 107 | return strlcpy(buf, "pernode", 20); |
| 108 | default: |
| 109 | return sprintf(buf, "%d", *ip); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode, |
| 114 | &svc_pool_map.mode, 0644); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 115 | |
| 116 | /* |
| 117 | * Detect best pool mapping mode heuristically, |
| 118 | * according to the machine's topology. |
| 119 | */ |
| 120 | static int |
| 121 | svc_pool_map_choose_mode(void) |
| 122 | { |
| 123 | unsigned int node; |
| 124 | |
| 125 | if (num_online_nodes() > 1) { |
| 126 | /* |
| 127 | * Actually have multiple NUMA nodes, |
| 128 | * so split pools on NUMA node boundaries |
| 129 | */ |
| 130 | return SVC_POOL_PERNODE; |
| 131 | } |
| 132 | |
| 133 | node = any_online_node(node_online_map); |
| 134 | if (nr_cpus_node(node) > 2) { |
| 135 | /* |
| 136 | * Non-trivial SMP, or CONFIG_NUMA on |
| 137 | * non-NUMA hardware, e.g. with a generic |
| 138 | * x86_64 kernel on Xeons. In this case we |
| 139 | * want to divide the pools on cpu boundaries. |
| 140 | */ |
| 141 | return SVC_POOL_PERCPU; |
| 142 | } |
| 143 | |
| 144 | /* default: one global pool */ |
| 145 | return SVC_POOL_GLOBAL; |
| 146 | } |
| 147 | |
| 148 | /* |
| 149 | * Allocate the to_pool[] and pool_to[] arrays. |
| 150 | * Returns 0 on success or an errno. |
| 151 | */ |
| 152 | static int |
| 153 | svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools) |
| 154 | { |
| 155 | m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL); |
| 156 | if (!m->to_pool) |
| 157 | goto fail; |
| 158 | m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL); |
| 159 | if (!m->pool_to) |
| 160 | goto fail_free; |
| 161 | |
| 162 | return 0; |
| 163 | |
| 164 | fail_free: |
| 165 | kfree(m->to_pool); |
| 166 | fail: |
| 167 | return -ENOMEM; |
| 168 | } |
| 169 | |
| 170 | /* |
| 171 | * Initialise the pool map for SVC_POOL_PERCPU mode. |
| 172 | * Returns number of pools or <0 on error. |
| 173 | */ |
| 174 | static int |
| 175 | svc_pool_map_init_percpu(struct svc_pool_map *m) |
| 176 | { |
Christoph Lameter | 53b8a31 | 2007-02-20 13:57:51 -0800 | [diff] [blame] | 177 | unsigned int maxpools = nr_cpu_ids; |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 178 | unsigned int pidx = 0; |
| 179 | unsigned int cpu; |
| 180 | int err; |
| 181 | |
| 182 | err = svc_pool_map_alloc_arrays(m, maxpools); |
| 183 | if (err) |
| 184 | return err; |
| 185 | |
| 186 | for_each_online_cpu(cpu) { |
| 187 | BUG_ON(pidx > maxpools); |
| 188 | m->to_pool[cpu] = pidx; |
| 189 | m->pool_to[pidx] = cpu; |
| 190 | pidx++; |
| 191 | } |
| 192 | /* cpus brought online later all get mapped to pool0, sorry */ |
| 193 | |
| 194 | return pidx; |
| 195 | }; |
| 196 | |
| 197 | |
| 198 | /* |
| 199 | * Initialise the pool map for SVC_POOL_PERNODE mode. |
| 200 | * Returns number of pools or <0 on error. |
| 201 | */ |
| 202 | static int |
| 203 | svc_pool_map_init_pernode(struct svc_pool_map *m) |
| 204 | { |
Christoph Lameter | 74c7aa8 | 2007-02-20 13:57:51 -0800 | [diff] [blame] | 205 | unsigned int maxpools = nr_node_ids; |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 206 | unsigned int pidx = 0; |
| 207 | unsigned int node; |
| 208 | int err; |
| 209 | |
| 210 | err = svc_pool_map_alloc_arrays(m, maxpools); |
| 211 | if (err) |
| 212 | return err; |
| 213 | |
| 214 | for_each_node_with_cpus(node) { |
| 215 | /* some architectures (e.g. SN2) have cpuless nodes */ |
| 216 | BUG_ON(pidx > maxpools); |
| 217 | m->to_pool[node] = pidx; |
| 218 | m->pool_to[pidx] = node; |
| 219 | pidx++; |
| 220 | } |
| 221 | /* nodes brought online later all get mapped to pool0, sorry */ |
| 222 | |
| 223 | return pidx; |
| 224 | } |
| 225 | |
| 226 | |
| 227 | /* |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 228 | * Add a reference to the global map of cpus to pools (and |
| 229 | * vice versa). Initialise the map if we're the first user. |
| 230 | * Returns the number of pools. |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 231 | */ |
| 232 | static unsigned int |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 233 | svc_pool_map_get(void) |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 234 | { |
| 235 | struct svc_pool_map *m = &svc_pool_map; |
| 236 | int npools = -1; |
| 237 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 238 | mutex_lock(&svc_pool_map_mutex); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 239 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 240 | if (m->count++) { |
| 241 | mutex_unlock(&svc_pool_map_mutex); |
| 242 | return m->npools; |
| 243 | } |
| 244 | |
| 245 | if (m->mode == SVC_POOL_AUTO) |
| 246 | m->mode = svc_pool_map_choose_mode(); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 247 | |
| 248 | switch (m->mode) { |
| 249 | case SVC_POOL_PERCPU: |
| 250 | npools = svc_pool_map_init_percpu(m); |
| 251 | break; |
| 252 | case SVC_POOL_PERNODE: |
| 253 | npools = svc_pool_map_init_pernode(m); |
| 254 | break; |
| 255 | } |
| 256 | |
| 257 | if (npools < 0) { |
| 258 | /* default, or memory allocation failure */ |
| 259 | npools = 1; |
| 260 | m->mode = SVC_POOL_GLOBAL; |
| 261 | } |
| 262 | m->npools = npools; |
| 263 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 264 | mutex_unlock(&svc_pool_map_mutex); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 265 | return m->npools; |
| 266 | } |
| 267 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 268 | |
| 269 | /* |
| 270 | * Drop a reference to the global map of cpus to pools. |
| 271 | * When the last reference is dropped, the map data is |
| 272 | * freed; this allows the sysadmin to change the pool |
| 273 | * mode using the pool_mode module option without |
| 274 | * rebooting or re-loading sunrpc.ko. |
| 275 | */ |
| 276 | static void |
| 277 | svc_pool_map_put(void) |
| 278 | { |
| 279 | struct svc_pool_map *m = &svc_pool_map; |
| 280 | |
| 281 | mutex_lock(&svc_pool_map_mutex); |
| 282 | |
| 283 | if (!--m->count) { |
| 284 | m->mode = SVC_POOL_DEFAULT; |
| 285 | kfree(m->to_pool); |
| 286 | kfree(m->pool_to); |
| 287 | m->npools = 0; |
| 288 | } |
| 289 | |
| 290 | mutex_unlock(&svc_pool_map_mutex); |
| 291 | } |
| 292 | |
| 293 | |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 294 | /* |
| 295 | * Set the current thread's cpus_allowed mask so that it |
| 296 | * will only run on cpus in the given pool. |
| 297 | * |
| 298 | * Returns 1 and fills in oldmask iff a cpumask was applied. |
| 299 | */ |
| 300 | static inline int |
| 301 | svc_pool_map_set_cpumask(unsigned int pidx, cpumask_t *oldmask) |
| 302 | { |
| 303 | struct svc_pool_map *m = &svc_pool_map; |
| 304 | unsigned int node; /* or cpu */ |
| 305 | |
| 306 | /* |
| 307 | * The caller checks for sv_nrpools > 1, which |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 308 | * implies that we've been initialized. |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 309 | */ |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 310 | BUG_ON(m->count == 0); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 311 | |
| 312 | switch (m->mode) |
| 313 | { |
| 314 | default: |
| 315 | return 0; |
| 316 | case SVC_POOL_PERCPU: |
| 317 | node = m->pool_to[pidx]; |
| 318 | *oldmask = current->cpus_allowed; |
| 319 | set_cpus_allowed(current, cpumask_of_cpu(node)); |
| 320 | return 1; |
| 321 | case SVC_POOL_PERNODE: |
| 322 | node = m->pool_to[pidx]; |
| 323 | *oldmask = current->cpus_allowed; |
| 324 | set_cpus_allowed(current, node_to_cpumask(node)); |
| 325 | return 1; |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | /* |
| 330 | * Use the mapping mode to choose a pool for a given CPU. |
| 331 | * Used when enqueueing an incoming RPC. Always returns |
| 332 | * a non-NULL pool pointer. |
| 333 | */ |
| 334 | struct svc_pool * |
| 335 | svc_pool_for_cpu(struct svc_serv *serv, int cpu) |
| 336 | { |
| 337 | struct svc_pool_map *m = &svc_pool_map; |
| 338 | unsigned int pidx = 0; |
| 339 | |
| 340 | /* |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 341 | * An uninitialised map happens in a pure client when |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 342 | * lockd is brought up, so silently treat it the |
| 343 | * same as SVC_POOL_GLOBAL. |
| 344 | */ |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 345 | if (svc_serv_is_pooled(serv)) { |
| 346 | switch (m->mode) { |
| 347 | case SVC_POOL_PERCPU: |
| 348 | pidx = m->to_pool[cpu]; |
| 349 | break; |
| 350 | case SVC_POOL_PERNODE: |
| 351 | pidx = m->to_pool[cpu_to_node(cpu)]; |
| 352 | break; |
| 353 | } |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 354 | } |
| 355 | return &serv->sv_pools[pidx % serv->sv_nrpools]; |
| 356 | } |
| 357 | |
| 358 | |
| 359 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | * Create an RPC service |
| 361 | */ |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 362 | static struct svc_serv * |
| 363 | __svc_create(struct svc_program *prog, unsigned int bufsize, int npools, |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 364 | void (*shutdown)(struct svc_serv *serv)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | { |
| 366 | struct svc_serv *serv; |
| 367 | int vers; |
| 368 | unsigned int xdrsize; |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 369 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 371 | if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | return NULL; |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 373 | serv->sv_name = prog->pg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | serv->sv_program = prog; |
| 375 | serv->sv_nrthreads = 1; |
| 376 | serv->sv_stats = prog->pg_stats; |
NeilBrown | c6b0a9f | 2006-10-06 00:44:05 -0700 | [diff] [blame] | 377 | if (bufsize > RPCSVC_MAXPAYLOAD) |
| 378 | bufsize = RPCSVC_MAXPAYLOAD; |
| 379 | serv->sv_max_payload = bufsize? bufsize : 4096; |
| 380 | serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE); |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 381 | serv->sv_shutdown = shutdown; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | xdrsize = 0; |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 383 | while (prog) { |
| 384 | prog->pg_lovers = prog->pg_nvers-1; |
| 385 | for (vers=0; vers<prog->pg_nvers ; vers++) |
| 386 | if (prog->pg_vers[vers]) { |
| 387 | prog->pg_hivers = vers; |
| 388 | if (prog->pg_lovers > vers) |
| 389 | prog->pg_lovers = vers; |
| 390 | if (prog->pg_vers[vers]->vs_xdrsize > xdrsize) |
| 391 | xdrsize = prog->pg_vers[vers]->vs_xdrsize; |
| 392 | } |
| 393 | prog = prog->pg_next; |
| 394 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | serv->sv_xdrsize = xdrsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | INIT_LIST_HEAD(&serv->sv_tempsocks); |
| 397 | INIT_LIST_HEAD(&serv->sv_permsocks); |
Greg Banks | 36bdfc8 | 2006-10-02 02:17:54 -0700 | [diff] [blame] | 398 | init_timer(&serv->sv_temptimer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | spin_lock_init(&serv->sv_lock); |
| 400 | |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 401 | serv->sv_nrpools = npools; |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 402 | serv->sv_pools = |
Robert P. J. Day | cd86128 | 2006-12-13 00:34:52 -0800 | [diff] [blame] | 403 | kcalloc(serv->sv_nrpools, sizeof(struct svc_pool), |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 404 | GFP_KERNEL); |
| 405 | if (!serv->sv_pools) { |
| 406 | kfree(serv); |
| 407 | return NULL; |
| 408 | } |
| 409 | |
| 410 | for (i = 0; i < serv->sv_nrpools; i++) { |
| 411 | struct svc_pool *pool = &serv->sv_pools[i]; |
| 412 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 413 | dprintk("svc: initialising pool %u for %s\n", |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 414 | i, serv->sv_name); |
| 415 | |
| 416 | pool->sp_id = i; |
| 417 | INIT_LIST_HEAD(&pool->sp_threads); |
| 418 | INIT_LIST_HEAD(&pool->sp_sockets); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 419 | INIT_LIST_HEAD(&pool->sp_all_threads); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 420 | spin_lock_init(&pool->sp_lock); |
| 421 | } |
| 422 | |
| 423 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | /* Remove any stale portmap registrations */ |
| 425 | svc_register(serv, 0, 0); |
| 426 | |
| 427 | return serv; |
| 428 | } |
| 429 | |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 430 | struct svc_serv * |
| 431 | svc_create(struct svc_program *prog, unsigned int bufsize, |
| 432 | void (*shutdown)(struct svc_serv *serv)) |
| 433 | { |
| 434 | return __svc_create(prog, bufsize, /*npools*/1, shutdown); |
| 435 | } |
Trond Myklebust | d2f7e79 | 2007-07-14 15:39:58 -0400 | [diff] [blame^] | 436 | EXPORT_SYMBOL(svc_create); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 437 | |
| 438 | struct svc_serv * |
| 439 | svc_create_pooled(struct svc_program *prog, unsigned int bufsize, |
| 440 | void (*shutdown)(struct svc_serv *serv), |
| 441 | svc_thread_fn func, int sig, struct module *mod) |
| 442 | { |
| 443 | struct svc_serv *serv; |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 444 | unsigned int npools = svc_pool_map_get(); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 445 | |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 446 | serv = __svc_create(prog, bufsize, npools, shutdown); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 447 | |
| 448 | if (serv != NULL) { |
| 449 | serv->sv_function = func; |
| 450 | serv->sv_kill_signal = sig; |
| 451 | serv->sv_module = mod; |
| 452 | } |
| 453 | |
| 454 | return serv; |
| 455 | } |
Trond Myklebust | d2f7e79 | 2007-07-14 15:39:58 -0400 | [diff] [blame^] | 456 | EXPORT_SYMBOL(svc_create_pooled); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | /* |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 459 | * Destroy an RPC service. Should be called with the BKL held |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | */ |
| 461 | void |
| 462 | svc_destroy(struct svc_serv *serv) |
| 463 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 464 | dprintk("svc: svc_destroy(%s, %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | serv->sv_program->pg_name, |
| 466 | serv->sv_nrthreads); |
| 467 | |
| 468 | if (serv->sv_nrthreads) { |
| 469 | if (--(serv->sv_nrthreads) != 0) { |
| 470 | svc_sock_update_bufs(serv); |
| 471 | return; |
| 472 | } |
| 473 | } else |
| 474 | printk("svc_destroy: no threads for serv=%p!\n", serv); |
| 475 | |
Greg Banks | 36bdfc8 | 2006-10-02 02:17:54 -0700 | [diff] [blame] | 476 | del_timer_sync(&serv->sv_temptimer); |
| 477 | |
Tom Tucker | 7a18208 | 2007-12-30 21:07:53 -0600 | [diff] [blame] | 478 | svc_close_all(&serv->sv_tempsocks); |
NeilBrown | cda1fd4 | 2007-03-06 01:42:22 -0800 | [diff] [blame] | 479 | |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 480 | if (serv->sv_shutdown) |
| 481 | serv->sv_shutdown(serv); |
| 482 | |
Tom Tucker | 7a18208 | 2007-12-30 21:07:53 -0600 | [diff] [blame] | 483 | svc_close_all(&serv->sv_permsocks); |
NeilBrown | cda1fd4 | 2007-03-06 01:42:22 -0800 | [diff] [blame] | 484 | |
| 485 | BUG_ON(!list_empty(&serv->sv_permsocks)); |
| 486 | BUG_ON(!list_empty(&serv->sv_tempsocks)); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 487 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | cache_clean_deferred(serv); |
| 489 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 490 | if (svc_serv_is_pooled(serv)) |
| 491 | svc_pool_map_put(); |
| 492 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | /* Unregister service with the portmapper */ |
| 494 | svc_register(serv, 0, 0); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 495 | kfree(serv->sv_pools); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | kfree(serv); |
| 497 | } |
Trond Myklebust | d2f7e79 | 2007-07-14 15:39:58 -0400 | [diff] [blame^] | 498 | EXPORT_SYMBOL(svc_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | |
| 500 | /* |
| 501 | * Allocate an RPC server's buffer space. |
| 502 | * We allocate pages and place them in rq_argpages. |
| 503 | */ |
| 504 | static int |
| 505 | svc_init_buffer(struct svc_rqst *rqstp, unsigned int size) |
| 506 | { |
| 507 | int pages; |
| 508 | int arghi; |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 509 | |
NeilBrown | c6b0a9f | 2006-10-06 00:44:05 -0700 | [diff] [blame] | 510 | pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply. |
| 511 | * We assume one is at most one page |
| 512 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | arghi = 0; |
Kris Katterjohn | 09a6266 | 2006-01-08 22:24:28 -0800 | [diff] [blame] | 514 | BUG_ON(pages > RPCSVC_MAXPAGES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | while (pages) { |
| 516 | struct page *p = alloc_page(GFP_KERNEL); |
| 517 | if (!p) |
| 518 | break; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 519 | rqstp->rq_pages[arghi++] = p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | pages--; |
| 521 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | return ! pages; |
| 523 | } |
| 524 | |
| 525 | /* |
| 526 | * Release an RPC server buffer |
| 527 | */ |
| 528 | static void |
| 529 | svc_release_buffer(struct svc_rqst *rqstp) |
| 530 | { |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 531 | int i; |
| 532 | for (i=0; i<ARRAY_SIZE(rqstp->rq_pages); i++) |
| 533 | if (rqstp->rq_pages[i]) |
| 534 | put_page(rqstp->rq_pages[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | } |
| 536 | |
Jeff Layton | 0113ab3 | 2008-01-29 10:30:54 -0500 | [diff] [blame] | 537 | struct svc_rqst * |
| 538 | svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool) |
| 539 | { |
| 540 | struct svc_rqst *rqstp; |
| 541 | |
| 542 | rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL); |
| 543 | if (!rqstp) |
| 544 | goto out_enomem; |
| 545 | |
| 546 | init_waitqueue_head(&rqstp->rq_wait); |
| 547 | |
| 548 | serv->sv_nrthreads++; |
| 549 | spin_lock_bh(&pool->sp_lock); |
| 550 | pool->sp_nrthreads++; |
| 551 | list_add(&rqstp->rq_all, &pool->sp_all_threads); |
| 552 | spin_unlock_bh(&pool->sp_lock); |
| 553 | rqstp->rq_server = serv; |
| 554 | rqstp->rq_pool = pool; |
| 555 | |
| 556 | rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL); |
| 557 | if (!rqstp->rq_argp) |
| 558 | goto out_thread; |
| 559 | |
| 560 | rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL); |
| 561 | if (!rqstp->rq_resp) |
| 562 | goto out_thread; |
| 563 | |
| 564 | if (!svc_init_buffer(rqstp, serv->sv_max_mesg)) |
| 565 | goto out_thread; |
| 566 | |
| 567 | return rqstp; |
| 568 | out_thread: |
| 569 | svc_exit_thread(rqstp); |
| 570 | out_enomem: |
| 571 | return ERR_PTR(-ENOMEM); |
| 572 | } |
| 573 | EXPORT_SYMBOL(svc_prepare_thread); |
| 574 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | /* |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 576 | * Create a thread in the given pool. Caller must hold BKL. |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 577 | * On a NUMA or SMP machine, with a multi-pool serv, the thread |
| 578 | * will be restricted to run on the cpus belonging to the pool. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | */ |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 580 | static int |
| 581 | __svc_create_thread(svc_thread_fn func, struct svc_serv *serv, |
| 582 | struct svc_pool *pool) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | { |
| 584 | struct svc_rqst *rqstp; |
| 585 | int error = -ENOMEM; |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 586 | int have_oldmask = 0; |
| 587 | cpumask_t oldmask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | |
Jeff Layton | 0113ab3 | 2008-01-29 10:30:54 -0500 | [diff] [blame] | 589 | rqstp = svc_prepare_thread(serv, pool); |
| 590 | if (IS_ERR(rqstp)) { |
| 591 | error = PTR_ERR(rqstp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | goto out; |
Jeff Layton | 0113ab3 | 2008-01-29 10:30:54 -0500 | [diff] [blame] | 593 | } |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 594 | |
| 595 | if (serv->sv_nrpools > 1) |
| 596 | have_oldmask = svc_pool_map_set_cpumask(pool->sp_id, &oldmask); |
| 597 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | error = kernel_thread((int (*)(void *)) func, rqstp, 0); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 599 | |
| 600 | if (have_oldmask) |
| 601 | set_cpus_allowed(current, oldmask); |
| 602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | if (error < 0) |
| 604 | goto out_thread; |
| 605 | svc_sock_update_bufs(serv); |
| 606 | error = 0; |
| 607 | out: |
| 608 | return error; |
| 609 | |
| 610 | out_thread: |
| 611 | svc_exit_thread(rqstp); |
| 612 | goto out; |
| 613 | } |
| 614 | |
| 615 | /* |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 616 | * Create a thread in the default pool. Caller must hold BKL. |
| 617 | */ |
| 618 | int |
| 619 | svc_create_thread(svc_thread_fn func, struct svc_serv *serv) |
| 620 | { |
| 621 | return __svc_create_thread(func, serv, &serv->sv_pools[0]); |
| 622 | } |
Trond Myklebust | d2f7e79 | 2007-07-14 15:39:58 -0400 | [diff] [blame^] | 623 | EXPORT_SYMBOL(svc_create_thread); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 624 | |
| 625 | /* |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 626 | * Choose a pool in which to create a new thread, for svc_set_num_threads |
| 627 | */ |
| 628 | static inline struct svc_pool * |
| 629 | choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) |
| 630 | { |
| 631 | if (pool != NULL) |
| 632 | return pool; |
| 633 | |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 634 | return &serv->sv_pools[(*state)++ % serv->sv_nrpools]; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 635 | } |
| 636 | |
| 637 | /* |
| 638 | * Choose a thread to kill, for svc_set_num_threads |
| 639 | */ |
| 640 | static inline struct task_struct * |
| 641 | choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) |
| 642 | { |
| 643 | unsigned int i; |
| 644 | struct task_struct *task = NULL; |
| 645 | |
| 646 | if (pool != NULL) { |
| 647 | spin_lock_bh(&pool->sp_lock); |
| 648 | } else { |
| 649 | /* choose a pool in round-robin fashion */ |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 650 | for (i = 0; i < serv->sv_nrpools; i++) { |
| 651 | pool = &serv->sv_pools[--(*state) % serv->sv_nrpools]; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 652 | spin_lock_bh(&pool->sp_lock); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 653 | if (!list_empty(&pool->sp_all_threads)) |
| 654 | goto found_pool; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 655 | spin_unlock_bh(&pool->sp_lock); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 656 | } |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 657 | return NULL; |
| 658 | } |
| 659 | |
| 660 | found_pool: |
| 661 | if (!list_empty(&pool->sp_all_threads)) { |
| 662 | struct svc_rqst *rqstp; |
| 663 | |
| 664 | /* |
| 665 | * Remove from the pool->sp_all_threads list |
| 666 | * so we don't try to kill it again. |
| 667 | */ |
| 668 | rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all); |
| 669 | list_del_init(&rqstp->rq_all); |
| 670 | task = rqstp->rq_task; |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 671 | } |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 672 | spin_unlock_bh(&pool->sp_lock); |
| 673 | |
| 674 | return task; |
| 675 | } |
| 676 | |
| 677 | /* |
| 678 | * Create or destroy enough new threads to make the number |
| 679 | * of threads the given number. If `pool' is non-NULL, applies |
| 680 | * only to threads in that pool, otherwise round-robins between |
| 681 | * all pools. Must be called with a svc_get() reference and |
| 682 | * the BKL held. |
| 683 | * |
| 684 | * Destroying threads relies on the service threads filling in |
| 685 | * rqstp->rq_task, which only the nfs ones do. Assumes the serv |
| 686 | * has been created using svc_create_pooled(). |
| 687 | * |
| 688 | * Based on code that used to be in nfsd_svc() but tweaked |
| 689 | * to be pool-aware. |
| 690 | */ |
| 691 | int |
| 692 | svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) |
| 693 | { |
| 694 | struct task_struct *victim; |
| 695 | int error = 0; |
| 696 | unsigned int state = serv->sv_nrthreads-1; |
| 697 | |
| 698 | if (pool == NULL) { |
| 699 | /* The -1 assumes caller has done a svc_get() */ |
| 700 | nrservs -= (serv->sv_nrthreads-1); |
| 701 | } else { |
| 702 | spin_lock_bh(&pool->sp_lock); |
| 703 | nrservs -= pool->sp_nrthreads; |
| 704 | spin_unlock_bh(&pool->sp_lock); |
| 705 | } |
| 706 | |
| 707 | /* create new threads */ |
| 708 | while (nrservs > 0) { |
| 709 | nrservs--; |
| 710 | __module_get(serv->sv_module); |
| 711 | error = __svc_create_thread(serv->sv_function, serv, |
| 712 | choose_pool(serv, pool, &state)); |
| 713 | if (error < 0) { |
| 714 | module_put(serv->sv_module); |
| 715 | break; |
| 716 | } |
| 717 | } |
| 718 | /* destroy old threads */ |
| 719 | while (nrservs < 0 && |
| 720 | (victim = choose_victim(serv, pool, &state)) != NULL) { |
| 721 | send_sig(serv->sv_kill_signal, victim, 1); |
| 722 | nrservs++; |
| 723 | } |
| 724 | |
| 725 | return error; |
| 726 | } |
Trond Myklebust | d2f7e79 | 2007-07-14 15:39:58 -0400 | [diff] [blame^] | 727 | EXPORT_SYMBOL(svc_set_num_threads); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 728 | |
| 729 | /* |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 730 | * Called from a server thread as it's exiting. Caller must hold BKL. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | */ |
| 732 | void |
| 733 | svc_exit_thread(struct svc_rqst *rqstp) |
| 734 | { |
| 735 | struct svc_serv *serv = rqstp->rq_server; |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 736 | struct svc_pool *pool = rqstp->rq_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | |
| 738 | svc_release_buffer(rqstp); |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 739 | kfree(rqstp->rq_resp); |
| 740 | kfree(rqstp->rq_argp); |
| 741 | kfree(rqstp->rq_auth_data); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 742 | |
| 743 | spin_lock_bh(&pool->sp_lock); |
| 744 | pool->sp_nrthreads--; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 745 | list_del(&rqstp->rq_all); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 746 | spin_unlock_bh(&pool->sp_lock); |
| 747 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | kfree(rqstp); |
| 749 | |
| 750 | /* Release the server */ |
| 751 | if (serv) |
| 752 | svc_destroy(serv); |
| 753 | } |
Trond Myklebust | d2f7e79 | 2007-07-14 15:39:58 -0400 | [diff] [blame^] | 754 | EXPORT_SYMBOL(svc_exit_thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | |
| 756 | /* |
| 757 | * Register an RPC service with the local portmapper. |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 758 | * To unregister a service, call this routine with |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | * proto and port == 0. |
| 760 | */ |
| 761 | int |
| 762 | svc_register(struct svc_serv *serv, int proto, unsigned short port) |
| 763 | { |
| 764 | struct svc_program *progp; |
| 765 | unsigned long flags; |
| 766 | int i, error = 0, dummy; |
| 767 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | if (!port) |
| 769 | clear_thread_flag(TIF_SIGPENDING); |
| 770 | |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 771 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { |
| 772 | for (i = 0; i < progp->pg_nvers; i++) { |
| 773 | if (progp->pg_vers[i] == NULL) |
| 774 | continue; |
| 775 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 776 | dprintk("svc: svc_register(%s, %s, %d, %d)%s\n", |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 777 | progp->pg_name, |
| 778 | proto == IPPROTO_UDP? "udp" : "tcp", |
| 779 | port, |
| 780 | i, |
| 781 | progp->pg_vers[i]->vs_hidden? |
| 782 | " (but not telling portmap)" : ""); |
| 783 | |
| 784 | if (progp->pg_vers[i]->vs_hidden) |
| 785 | continue; |
| 786 | |
Chuck Lever | 2608001 | 2007-03-29 16:48:16 -0400 | [diff] [blame] | 787 | error = rpcb_register(progp->pg_prog, i, proto, port, &dummy); |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 788 | if (error < 0) |
| 789 | break; |
| 790 | if (port && !dummy) { |
| 791 | error = -EACCES; |
| 792 | break; |
| 793 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | } |
| 795 | } |
| 796 | |
| 797 | if (!port) { |
| 798 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
| 799 | recalc_sigpending(); |
| 800 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
| 801 | } |
| 802 | |
| 803 | return error; |
| 804 | } |
| 805 | |
| 806 | /* |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 807 | * Printk the given error with the address of the client that caused it. |
| 808 | */ |
| 809 | static int |
| 810 | __attribute__ ((format (printf, 2, 3))) |
| 811 | svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) |
| 812 | { |
| 813 | va_list args; |
| 814 | int r; |
| 815 | char buf[RPC_MAX_ADDRBUFLEN]; |
| 816 | |
| 817 | if (!net_ratelimit()) |
| 818 | return 0; |
| 819 | |
| 820 | printk(KERN_WARNING "svc: %s: ", |
| 821 | svc_print_addr(rqstp, buf, sizeof(buf))); |
| 822 | |
| 823 | va_start(args, fmt); |
| 824 | r = vprintk(fmt, args); |
| 825 | va_end(args); |
| 826 | |
| 827 | return r; |
| 828 | } |
| 829 | |
| 830 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | * Process the RPC request. |
| 832 | */ |
| 833 | int |
NeilBrown | 6fb2b47 | 2006-10-02 02:17:50 -0700 | [diff] [blame] | 834 | svc_process(struct svc_rqst *rqstp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | { |
| 836 | struct svc_program *progp; |
| 837 | struct svc_version *versp = NULL; /* compiler food */ |
| 838 | struct svc_procedure *procp = NULL; |
| 839 | struct kvec * argv = &rqstp->rq_arg.head[0]; |
| 840 | struct kvec * resv = &rqstp->rq_res.head[0]; |
NeilBrown | 6fb2b47 | 2006-10-02 02:17:50 -0700 | [diff] [blame] | 841 | struct svc_serv *serv = rqstp->rq_server; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | kxdrproc_t xdr; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 843 | __be32 *statp; |
| 844 | u32 dir, prog, vers, proc; |
| 845 | __be32 auth_stat, rpc_stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | int auth_res; |
J.Bruce Fields | 8f8e05c | 2006-10-04 02:16:08 -0700 | [diff] [blame] | 847 | __be32 *reply_statp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
| 849 | rpc_stat = rpc_success; |
| 850 | |
| 851 | if (argv->iov_len < 6*4) |
| 852 | goto err_short_len; |
| 853 | |
| 854 | /* setup response xdr_buf. |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 855 | * Initially it has just one page |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | */ |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 857 | rqstp->rq_resused = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | resv->iov_base = page_address(rqstp->rq_respages[0]); |
| 859 | resv->iov_len = 0; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 860 | rqstp->rq_res.pages = rqstp->rq_respages + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | rqstp->rq_res.len = 0; |
| 862 | rqstp->rq_res.page_base = 0; |
| 863 | rqstp->rq_res.page_len = 0; |
Trond Myklebust | 334ccfd | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 864 | rqstp->rq_res.buflen = PAGE_SIZE; |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 865 | rqstp->rq_res.tail[0].iov_base = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | rqstp->rq_res.tail[0].iov_len = 0; |
J. Bruce Fields | 5c04c46 | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 867 | /* Will be turned off only in gss privacy case: */ |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 868 | rqstp->rq_splice_ok = 1; |
Tom Tucker | e831fe6 | 2007-12-30 21:07:29 -0600 | [diff] [blame] | 869 | |
| 870 | /* Setup reply header */ |
| 871 | rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
| 873 | rqstp->rq_xid = svc_getu32(argv); |
| 874 | svc_putu32(resv, rqstp->rq_xid); |
| 875 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 876 | dir = svc_getnl(argv); |
| 877 | vers = svc_getnl(argv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | |
| 879 | /* First words of reply: */ |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 880 | svc_putnl(resv, 1); /* REPLY */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | |
| 882 | if (dir != 0) /* direction != CALL */ |
| 883 | goto err_bad_dir; |
| 884 | if (vers != 2) /* RPC version number */ |
| 885 | goto err_bad_rpc; |
| 886 | |
| 887 | /* Save position in case we later decide to reject: */ |
J.Bruce Fields | 8f8e05c | 2006-10-04 02:16:08 -0700 | [diff] [blame] | 888 | reply_statp = resv->iov_base + resv->iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 890 | svc_putnl(resv, 0); /* ACCEPT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 892 | rqstp->rq_prog = prog = svc_getnl(argv); /* program number */ |
| 893 | rqstp->rq_vers = vers = svc_getnl(argv); /* version number */ |
| 894 | rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | |
| 896 | progp = serv->sv_program; |
NeilBrown | 80d188a | 2005-11-07 01:00:27 -0800 | [diff] [blame] | 897 | |
| 898 | for (progp = serv->sv_program; progp; progp = progp->pg_next) |
| 899 | if (prog == progp->pg_prog) |
| 900 | break; |
| 901 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | /* |
| 903 | * Decode auth data, and add verifier to reply buffer. |
| 904 | * We do this before anything else in order to get a decent |
| 905 | * auth verifier. |
| 906 | */ |
| 907 | auth_res = svc_authenticate(rqstp, &auth_stat); |
| 908 | /* Also give the program a chance to reject this call: */ |
NeilBrown | 80d188a | 2005-11-07 01:00:27 -0800 | [diff] [blame] | 909 | if (auth_res == SVC_OK && progp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | auth_stat = rpc_autherr_badcred; |
| 911 | auth_res = progp->pg_authenticate(rqstp); |
| 912 | } |
| 913 | switch (auth_res) { |
| 914 | case SVC_OK: |
| 915 | break; |
| 916 | case SVC_GARBAGE: |
| 917 | rpc_stat = rpc_garbage_args; |
| 918 | goto err_bad; |
| 919 | case SVC_SYSERR: |
| 920 | rpc_stat = rpc_system_err; |
| 921 | goto err_bad; |
| 922 | case SVC_DENIED: |
| 923 | goto err_bad_auth; |
| 924 | case SVC_DROP: |
| 925 | goto dropit; |
| 926 | case SVC_COMPLETE: |
| 927 | goto sendit; |
| 928 | } |
NeilBrown | 80d188a | 2005-11-07 01:00:27 -0800 | [diff] [blame] | 929 | |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 930 | if (progp == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | goto err_bad_prog; |
| 932 | |
| 933 | if (vers >= progp->pg_nvers || |
| 934 | !(versp = progp->pg_vers[vers])) |
| 935 | goto err_bad_vers; |
| 936 | |
| 937 | procp = versp->vs_proc + proc; |
| 938 | if (proc >= versp->vs_nproc || !procp->pc_func) |
| 939 | goto err_bad_proc; |
| 940 | rqstp->rq_server = serv; |
| 941 | rqstp->rq_procinfo = procp; |
| 942 | |
| 943 | /* Syntactic check complete */ |
| 944 | serv->sv_stats->rpccnt++; |
| 945 | |
| 946 | /* Build the reply header. */ |
| 947 | statp = resv->iov_base +resv->iov_len; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 948 | svc_putnl(resv, RPC_SUCCESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | |
| 950 | /* Bump per-procedure stats counter */ |
| 951 | procp->pc_count++; |
| 952 | |
| 953 | /* Initialize storage for argp and resp */ |
| 954 | memset(rqstp->rq_argp, 0, procp->pc_argsize); |
| 955 | memset(rqstp->rq_resp, 0, procp->pc_ressize); |
| 956 | |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 957 | /* un-reserve some of the out-queue now that we have a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | * better idea of reply size |
| 959 | */ |
| 960 | if (procp->pc_xdrressize) |
Jeff Layton | cd12301 | 2007-05-09 02:34:50 -0700 | [diff] [blame] | 961 | svc_reserve_auth(rqstp, procp->pc_xdrressize<<2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | |
| 963 | /* Call the function that processes the request. */ |
| 964 | if (!versp->vs_dispatch) { |
| 965 | /* Decode arguments */ |
| 966 | xdr = procp->pc_decode; |
| 967 | if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp)) |
| 968 | goto err_garbage; |
| 969 | |
| 970 | *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); |
| 971 | |
| 972 | /* Encode reply */ |
NeilBrown | d343fce | 2006-10-17 00:10:18 -0700 | [diff] [blame] | 973 | if (*statp == rpc_drop_reply) { |
| 974 | if (procp->pc_release) |
| 975 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); |
| 976 | goto dropit; |
| 977 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | if (*statp == rpc_success && (xdr = procp->pc_encode) |
| 979 | && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) { |
| 980 | dprintk("svc: failed to encode reply\n"); |
| 981 | /* serv->sv_stats->rpcsystemerr++; */ |
| 982 | *statp = rpc_system_err; |
| 983 | } |
| 984 | } else { |
| 985 | dprintk("svc: calling dispatcher\n"); |
| 986 | if (!versp->vs_dispatch(rqstp, statp)) { |
| 987 | /* Release reply info */ |
| 988 | if (procp->pc_release) |
| 989 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); |
| 990 | goto dropit; |
| 991 | } |
| 992 | } |
| 993 | |
| 994 | /* Check RPC status result */ |
| 995 | if (*statp != rpc_success) |
| 996 | resv->iov_len = ((void*)statp) - resv->iov_base + 4; |
| 997 | |
| 998 | /* Release reply info */ |
| 999 | if (procp->pc_release) |
| 1000 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); |
| 1001 | |
| 1002 | if (procp->pc_encode == NULL) |
| 1003 | goto dropit; |
| 1004 | |
| 1005 | sendit: |
| 1006 | if (svc_authorise(rqstp)) |
| 1007 | goto dropit; |
| 1008 | return svc_send(rqstp); |
| 1009 | |
| 1010 | dropit: |
| 1011 | svc_authorise(rqstp); /* doesn't hurt to call this twice */ |
| 1012 | dprintk("svc: svc_process dropit\n"); |
| 1013 | svc_drop(rqstp); |
| 1014 | return 0; |
| 1015 | |
| 1016 | err_short_len: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1017 | svc_printk(rqstp, "short len %Zd, dropping request\n", |
| 1018 | argv->iov_len); |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1019 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | goto dropit; /* drop request */ |
| 1021 | |
| 1022 | err_bad_dir: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1023 | svc_printk(rqstp, "bad direction %d, dropping request\n", dir); |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1024 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | serv->sv_stats->rpcbadfmt++; |
| 1026 | goto dropit; /* drop request */ |
| 1027 | |
| 1028 | err_bad_rpc: |
| 1029 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1030 | svc_putnl(resv, 1); /* REJECT */ |
| 1031 | svc_putnl(resv, 0); /* RPC_MISMATCH */ |
| 1032 | svc_putnl(resv, 2); /* Only RPCv2 supported */ |
| 1033 | svc_putnl(resv, 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | goto sendit; |
| 1035 | |
| 1036 | err_bad_auth: |
| 1037 | dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat)); |
| 1038 | serv->sv_stats->rpcbadauth++; |
| 1039 | /* Restore write pointer to location of accept status: */ |
J.Bruce Fields | 8f8e05c | 2006-10-04 02:16:08 -0700 | [diff] [blame] | 1040 | xdr_ressize_check(rqstp, reply_statp); |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1041 | svc_putnl(resv, 1); /* REJECT */ |
| 1042 | svc_putnl(resv, 1); /* AUTH_ERROR */ |
| 1043 | svc_putnl(resv, ntohl(auth_stat)); /* status */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | goto sendit; |
| 1045 | |
| 1046 | err_bad_prog: |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 1047 | dprintk("svc: unknown program %d\n", prog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1049 | svc_putnl(resv, RPC_PROG_UNAVAIL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | goto sendit; |
| 1051 | |
| 1052 | err_bad_vers: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1053 | svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n", |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1054 | vers, prog, progp->pg_name); |
| 1055 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1057 | svc_putnl(resv, RPC_PROG_MISMATCH); |
| 1058 | svc_putnl(resv, progp->pg_lovers); |
| 1059 | svc_putnl(resv, progp->pg_hivers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | goto sendit; |
| 1061 | |
| 1062 | err_bad_proc: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1063 | svc_printk(rqstp, "unknown procedure (%d)\n", proc); |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1064 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1066 | svc_putnl(resv, RPC_PROC_UNAVAIL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | goto sendit; |
| 1068 | |
| 1069 | err_garbage: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1070 | svc_printk(rqstp, "failed to decode args\n"); |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1071 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | rpc_stat = rpc_garbage_args; |
| 1073 | err_bad: |
| 1074 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1075 | svc_putnl(resv, ntohl(rpc_stat)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | goto sendit; |
| 1077 | } |
Trond Myklebust | d2f7e79 | 2007-07-14 15:39:58 -0400 | [diff] [blame^] | 1078 | EXPORT_SYMBOL(svc_process); |
Greg Banks | 7adae48 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1079 | |
| 1080 | /* |
| 1081 | * Return (transport-specific) limit on the rpc payload. |
| 1082 | */ |
| 1083 | u32 svc_max_payload(const struct svc_rqst *rqstp) |
| 1084 | { |
Tom Tucker | 4902315 | 2007-12-30 21:07:21 -0600 | [diff] [blame] | 1085 | u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload; |
Greg Banks | 7adae48 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1086 | |
NeilBrown | c6b0a9f | 2006-10-06 00:44:05 -0700 | [diff] [blame] | 1087 | if (rqstp->rq_server->sv_max_payload < max) |
| 1088 | max = rqstp->rq_server->sv_max_payload; |
Greg Banks | 7adae48 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1089 | return max; |
| 1090 | } |
| 1091 | EXPORT_SYMBOL_GPL(svc_max_payload); |