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> |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 21 | #include <linux/kthread.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> |
Ricardo Labiaga | 4d6bbb6 | 2009-04-01 09:23:07 -0400 | [diff] [blame] | 28 | #include <linux/sunrpc/bc_xprt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
| 30 | #define RPCDBG_FACILITY RPCDBG_SVCDSP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 32 | static void svc_unregister(const struct svc_serv *serv); |
| 33 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 34 | #define svc_serv_is_pooled(serv) ((serv)->sv_function) |
| 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | /* |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 37 | * Mode for mapping cpus to pools. |
| 38 | */ |
| 39 | enum { |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 40 | SVC_POOL_AUTO = -1, /* choose one of the others */ |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 41 | SVC_POOL_GLOBAL, /* no mapping, just a single global pool |
| 42 | * (legacy & UP mode) */ |
| 43 | SVC_POOL_PERCPU, /* one pool per cpu */ |
| 44 | SVC_POOL_PERNODE /* one pool per numa node */ |
| 45 | }; |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 46 | #define SVC_POOL_DEFAULT SVC_POOL_GLOBAL |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 47 | |
| 48 | /* |
| 49 | * Structure for mapping cpus to pools and vice versa. |
| 50 | * Setup once during sunrpc initialisation. |
| 51 | */ |
| 52 | static struct svc_pool_map { |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 53 | int count; /* How many svc_servs use us */ |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 54 | int mode; /* Note: int not enum to avoid |
| 55 | * warnings about "enumeration value |
| 56 | * not handled in switch" */ |
| 57 | unsigned int npools; |
| 58 | unsigned int *pool_to; /* maps pool id to cpu or node */ |
| 59 | unsigned int *to_pool; /* maps cpu or node to pool id */ |
| 60 | } svc_pool_map = { |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 61 | .count = 0, |
| 62 | .mode = SVC_POOL_DEFAULT |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 63 | }; |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 64 | 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] | 65 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 66 | static int |
| 67 | param_set_pool_mode(const char *val, struct kernel_param *kp) |
| 68 | { |
| 69 | int *ip = (int *)kp->arg; |
| 70 | struct svc_pool_map *m = &svc_pool_map; |
| 71 | int err; |
| 72 | |
| 73 | mutex_lock(&svc_pool_map_mutex); |
| 74 | |
| 75 | err = -EBUSY; |
| 76 | if (m->count) |
| 77 | goto out; |
| 78 | |
| 79 | err = 0; |
| 80 | if (!strncmp(val, "auto", 4)) |
| 81 | *ip = SVC_POOL_AUTO; |
| 82 | else if (!strncmp(val, "global", 6)) |
| 83 | *ip = SVC_POOL_GLOBAL; |
| 84 | else if (!strncmp(val, "percpu", 6)) |
| 85 | *ip = SVC_POOL_PERCPU; |
| 86 | else if (!strncmp(val, "pernode", 7)) |
| 87 | *ip = SVC_POOL_PERNODE; |
| 88 | else |
| 89 | err = -EINVAL; |
| 90 | |
| 91 | out: |
| 92 | mutex_unlock(&svc_pool_map_mutex); |
| 93 | return err; |
| 94 | } |
| 95 | |
| 96 | static int |
| 97 | param_get_pool_mode(char *buf, struct kernel_param *kp) |
| 98 | { |
| 99 | int *ip = (int *)kp->arg; |
| 100 | |
| 101 | switch (*ip) |
| 102 | { |
| 103 | case SVC_POOL_AUTO: |
| 104 | return strlcpy(buf, "auto", 20); |
| 105 | case SVC_POOL_GLOBAL: |
| 106 | return strlcpy(buf, "global", 20); |
| 107 | case SVC_POOL_PERCPU: |
| 108 | return strlcpy(buf, "percpu", 20); |
| 109 | case SVC_POOL_PERNODE: |
| 110 | return strlcpy(buf, "pernode", 20); |
| 111 | default: |
| 112 | return sprintf(buf, "%d", *ip); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode, |
| 117 | &svc_pool_map.mode, 0644); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 118 | |
| 119 | /* |
| 120 | * Detect best pool mapping mode heuristically, |
| 121 | * according to the machine's topology. |
| 122 | */ |
| 123 | static int |
| 124 | svc_pool_map_choose_mode(void) |
| 125 | { |
| 126 | unsigned int node; |
| 127 | |
Christoph Lameter | 62bc62a | 2009-06-16 15:32:15 -0700 | [diff] [blame] | 128 | if (nr_online_nodes > 1) { |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 129 | /* |
| 130 | * Actually have multiple NUMA nodes, |
| 131 | * so split pools on NUMA node boundaries |
| 132 | */ |
| 133 | return SVC_POOL_PERNODE; |
| 134 | } |
| 135 | |
| 136 | node = any_online_node(node_online_map); |
| 137 | if (nr_cpus_node(node) > 2) { |
| 138 | /* |
| 139 | * Non-trivial SMP, or CONFIG_NUMA on |
| 140 | * non-NUMA hardware, e.g. with a generic |
| 141 | * x86_64 kernel on Xeons. In this case we |
| 142 | * want to divide the pools on cpu boundaries. |
| 143 | */ |
| 144 | return SVC_POOL_PERCPU; |
| 145 | } |
| 146 | |
| 147 | /* default: one global pool */ |
| 148 | return SVC_POOL_GLOBAL; |
| 149 | } |
| 150 | |
| 151 | /* |
| 152 | * Allocate the to_pool[] and pool_to[] arrays. |
| 153 | * Returns 0 on success or an errno. |
| 154 | */ |
| 155 | static int |
| 156 | svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools) |
| 157 | { |
| 158 | m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL); |
| 159 | if (!m->to_pool) |
| 160 | goto fail; |
| 161 | m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL); |
| 162 | if (!m->pool_to) |
| 163 | goto fail_free; |
| 164 | |
| 165 | return 0; |
| 166 | |
| 167 | fail_free: |
| 168 | kfree(m->to_pool); |
| 169 | fail: |
| 170 | return -ENOMEM; |
| 171 | } |
| 172 | |
| 173 | /* |
| 174 | * Initialise the pool map for SVC_POOL_PERCPU mode. |
| 175 | * Returns number of pools or <0 on error. |
| 176 | */ |
| 177 | static int |
| 178 | svc_pool_map_init_percpu(struct svc_pool_map *m) |
| 179 | { |
Christoph Lameter | 53b8a31 | 2007-02-20 13:57:51 -0800 | [diff] [blame] | 180 | unsigned int maxpools = nr_cpu_ids; |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 181 | unsigned int pidx = 0; |
| 182 | unsigned int cpu; |
| 183 | int err; |
| 184 | |
| 185 | err = svc_pool_map_alloc_arrays(m, maxpools); |
| 186 | if (err) |
| 187 | return err; |
| 188 | |
| 189 | for_each_online_cpu(cpu) { |
| 190 | BUG_ON(pidx > maxpools); |
| 191 | m->to_pool[cpu] = pidx; |
| 192 | m->pool_to[pidx] = cpu; |
| 193 | pidx++; |
| 194 | } |
| 195 | /* cpus brought online later all get mapped to pool0, sorry */ |
| 196 | |
| 197 | return pidx; |
| 198 | }; |
| 199 | |
| 200 | |
| 201 | /* |
| 202 | * Initialise the pool map for SVC_POOL_PERNODE mode. |
| 203 | * Returns number of pools or <0 on error. |
| 204 | */ |
| 205 | static int |
| 206 | svc_pool_map_init_pernode(struct svc_pool_map *m) |
| 207 | { |
Christoph Lameter | 74c7aa8 | 2007-02-20 13:57:51 -0800 | [diff] [blame] | 208 | unsigned int maxpools = nr_node_ids; |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 209 | unsigned int pidx = 0; |
| 210 | unsigned int node; |
| 211 | int err; |
| 212 | |
| 213 | err = svc_pool_map_alloc_arrays(m, maxpools); |
| 214 | if (err) |
| 215 | return err; |
| 216 | |
| 217 | for_each_node_with_cpus(node) { |
| 218 | /* some architectures (e.g. SN2) have cpuless nodes */ |
| 219 | BUG_ON(pidx > maxpools); |
| 220 | m->to_pool[node] = pidx; |
| 221 | m->pool_to[pidx] = node; |
| 222 | pidx++; |
| 223 | } |
| 224 | /* nodes brought online later all get mapped to pool0, sorry */ |
| 225 | |
| 226 | return pidx; |
| 227 | } |
| 228 | |
| 229 | |
| 230 | /* |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 231 | * Add a reference to the global map of cpus to pools (and |
| 232 | * vice versa). Initialise the map if we're the first user. |
| 233 | * Returns the number of pools. |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 234 | */ |
| 235 | static unsigned int |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 236 | svc_pool_map_get(void) |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 237 | { |
| 238 | struct svc_pool_map *m = &svc_pool_map; |
| 239 | int npools = -1; |
| 240 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 241 | mutex_lock(&svc_pool_map_mutex); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 242 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 243 | if (m->count++) { |
| 244 | mutex_unlock(&svc_pool_map_mutex); |
| 245 | return m->npools; |
| 246 | } |
| 247 | |
| 248 | if (m->mode == SVC_POOL_AUTO) |
| 249 | m->mode = svc_pool_map_choose_mode(); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 250 | |
| 251 | switch (m->mode) { |
| 252 | case SVC_POOL_PERCPU: |
| 253 | npools = svc_pool_map_init_percpu(m); |
| 254 | break; |
| 255 | case SVC_POOL_PERNODE: |
| 256 | npools = svc_pool_map_init_pernode(m); |
| 257 | break; |
| 258 | } |
| 259 | |
| 260 | if (npools < 0) { |
| 261 | /* default, or memory allocation failure */ |
| 262 | npools = 1; |
| 263 | m->mode = SVC_POOL_GLOBAL; |
| 264 | } |
| 265 | m->npools = npools; |
| 266 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 267 | mutex_unlock(&svc_pool_map_mutex); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 268 | return m->npools; |
| 269 | } |
| 270 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 271 | |
| 272 | /* |
| 273 | * Drop a reference to the global map of cpus to pools. |
| 274 | * When the last reference is dropped, the map data is |
| 275 | * freed; this allows the sysadmin to change the pool |
| 276 | * mode using the pool_mode module option without |
| 277 | * rebooting or re-loading sunrpc.ko. |
| 278 | */ |
| 279 | static void |
| 280 | svc_pool_map_put(void) |
| 281 | { |
| 282 | struct svc_pool_map *m = &svc_pool_map; |
| 283 | |
| 284 | mutex_lock(&svc_pool_map_mutex); |
| 285 | |
| 286 | if (!--m->count) { |
| 287 | m->mode = SVC_POOL_DEFAULT; |
| 288 | kfree(m->to_pool); |
| 289 | kfree(m->pool_to); |
| 290 | m->npools = 0; |
| 291 | } |
| 292 | |
| 293 | mutex_unlock(&svc_pool_map_mutex); |
| 294 | } |
| 295 | |
| 296 | |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 297 | /* |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 298 | * Set the given thread's cpus_allowed mask so that it |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 299 | * will only run on cpus in the given pool. |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 300 | */ |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 301 | static inline void |
| 302 | svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx) |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 303 | { |
| 304 | struct svc_pool_map *m = &svc_pool_map; |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 305 | unsigned int node = m->pool_to[pidx]; |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 306 | |
| 307 | /* |
| 308 | * The caller checks for sv_nrpools > 1, which |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 309 | * implies that we've been initialized. |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 310 | */ |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 311 | BUG_ON(m->count == 0); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 312 | |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 313 | switch (m->mode) { |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 314 | case SVC_POOL_PERCPU: |
Mike Travis | c5f59f0 | 2008-04-04 18:11:10 -0700 | [diff] [blame] | 315 | { |
Rusty Russell | aa85ea5 | 2009-03-30 22:05:15 -0600 | [diff] [blame] | 316 | set_cpus_allowed_ptr(task, cpumask_of(node)); |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 317 | break; |
Mike Travis | c5f59f0 | 2008-04-04 18:11:10 -0700 | [diff] [blame] | 318 | } |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 319 | case SVC_POOL_PERNODE: |
Mike Travis | c5f59f0 | 2008-04-04 18:11:10 -0700 | [diff] [blame] | 320 | { |
Rusty Russell | a70f730 | 2009-03-13 14:49:46 +1030 | [diff] [blame] | 321 | set_cpus_allowed_ptr(task, cpumask_of_node(node)); |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 322 | break; |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 323 | } |
Mike Travis | c5f59f0 | 2008-04-04 18:11:10 -0700 | [diff] [blame] | 324 | } |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 325 | } |
| 326 | |
| 327 | /* |
| 328 | * Use the mapping mode to choose a pool for a given CPU. |
| 329 | * Used when enqueueing an incoming RPC. Always returns |
| 330 | * a non-NULL pool pointer. |
| 331 | */ |
| 332 | struct svc_pool * |
| 333 | svc_pool_for_cpu(struct svc_serv *serv, int cpu) |
| 334 | { |
| 335 | struct svc_pool_map *m = &svc_pool_map; |
| 336 | unsigned int pidx = 0; |
| 337 | |
| 338 | /* |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 339 | * An uninitialised map happens in a pure client when |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 340 | * lockd is brought up, so silently treat it the |
| 341 | * same as SVC_POOL_GLOBAL. |
| 342 | */ |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 343 | if (svc_serv_is_pooled(serv)) { |
| 344 | switch (m->mode) { |
| 345 | case SVC_POOL_PERCPU: |
| 346 | pidx = m->to_pool[cpu]; |
| 347 | break; |
| 348 | case SVC_POOL_PERNODE: |
| 349 | pidx = m->to_pool[cpu_to_node(cpu)]; |
| 350 | break; |
| 351 | } |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 352 | } |
| 353 | return &serv->sv_pools[pidx % serv->sv_nrpools]; |
| 354 | } |
| 355 | |
| 356 | |
| 357 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | * Create an RPC service |
| 359 | */ |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 360 | static struct svc_serv * |
| 361 | __svc_create(struct svc_program *prog, unsigned int bufsize, int npools, |
Chuck Lever | 49a9072 | 2009-03-18 20:46:29 -0400 | [diff] [blame] | 362 | void (*shutdown)(struct svc_serv *serv)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | { |
| 364 | struct svc_serv *serv; |
Chuck Lever | ea339d4 | 2007-10-26 13:32:56 -0400 | [diff] [blame] | 365 | unsigned int vers; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | unsigned int xdrsize; |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 367 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 369 | if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | return NULL; |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 371 | serv->sv_name = prog->pg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | serv->sv_program = prog; |
| 373 | serv->sv_nrthreads = 1; |
| 374 | serv->sv_stats = prog->pg_stats; |
NeilBrown | c6b0a9f | 2006-10-06 00:44:05 -0700 | [diff] [blame] | 375 | if (bufsize > RPCSVC_MAXPAYLOAD) |
| 376 | bufsize = RPCSVC_MAXPAYLOAD; |
| 377 | serv->sv_max_payload = bufsize? bufsize : 4096; |
| 378 | serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE); |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 379 | serv->sv_shutdown = shutdown; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | xdrsize = 0; |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 381 | while (prog) { |
| 382 | prog->pg_lovers = prog->pg_nvers-1; |
| 383 | for (vers=0; vers<prog->pg_nvers ; vers++) |
| 384 | if (prog->pg_vers[vers]) { |
| 385 | prog->pg_hivers = vers; |
| 386 | if (prog->pg_lovers > vers) |
| 387 | prog->pg_lovers = vers; |
| 388 | if (prog->pg_vers[vers]->vs_xdrsize > xdrsize) |
| 389 | xdrsize = prog->pg_vers[vers]->vs_xdrsize; |
| 390 | } |
| 391 | prog = prog->pg_next; |
| 392 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | serv->sv_xdrsize = xdrsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | INIT_LIST_HEAD(&serv->sv_tempsocks); |
| 395 | INIT_LIST_HEAD(&serv->sv_permsocks); |
Greg Banks | 36bdfc8 | 2006-10-02 02:17:54 -0700 | [diff] [blame] | 396 | init_timer(&serv->sv_temptimer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | spin_lock_init(&serv->sv_lock); |
| 398 | |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 399 | serv->sv_nrpools = npools; |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 400 | serv->sv_pools = |
Robert P. J. Day | cd86128 | 2006-12-13 00:34:52 -0800 | [diff] [blame] | 401 | kcalloc(serv->sv_nrpools, sizeof(struct svc_pool), |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 402 | GFP_KERNEL); |
| 403 | if (!serv->sv_pools) { |
| 404 | kfree(serv); |
| 405 | return NULL; |
| 406 | } |
| 407 | |
| 408 | for (i = 0; i < serv->sv_nrpools; i++) { |
| 409 | struct svc_pool *pool = &serv->sv_pools[i]; |
| 410 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 411 | dprintk("svc: initialising pool %u for %s\n", |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 412 | i, serv->sv_name); |
| 413 | |
| 414 | pool->sp_id = i; |
| 415 | INIT_LIST_HEAD(&pool->sp_threads); |
| 416 | INIT_LIST_HEAD(&pool->sp_sockets); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 417 | INIT_LIST_HEAD(&pool->sp_all_threads); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 418 | spin_lock_init(&pool->sp_lock); |
| 419 | } |
| 420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | /* Remove any stale portmap registrations */ |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 422 | svc_unregister(serv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
| 424 | return serv; |
| 425 | } |
| 426 | |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 427 | struct svc_serv * |
| 428 | svc_create(struct svc_program *prog, unsigned int bufsize, |
Chuck Lever | 49a9072 | 2009-03-18 20:46:29 -0400 | [diff] [blame] | 429 | void (*shutdown)(struct svc_serv *serv)) |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 430 | { |
Chuck Lever | 49a9072 | 2009-03-18 20:46:29 -0400 | [diff] [blame] | 431 | return __svc_create(prog, bufsize, /*npools*/1, shutdown); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 432 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 433 | EXPORT_SYMBOL_GPL(svc_create); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 434 | |
| 435 | struct svc_serv * |
| 436 | svc_create_pooled(struct svc_program *prog, unsigned int bufsize, |
Chuck Lever | 49a9072 | 2009-03-18 20:46:29 -0400 | [diff] [blame] | 437 | void (*shutdown)(struct svc_serv *serv), |
Jeff Layton | a75c5d0 | 2008-06-10 08:40:39 -0400 | [diff] [blame] | 438 | svc_thread_fn func, struct module *mod) |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 439 | { |
| 440 | struct svc_serv *serv; |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 441 | unsigned int npools = svc_pool_map_get(); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 442 | |
Chuck Lever | 49a9072 | 2009-03-18 20:46:29 -0400 | [diff] [blame] | 443 | serv = __svc_create(prog, bufsize, npools, shutdown); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 444 | |
| 445 | if (serv != NULL) { |
| 446 | serv->sv_function = func; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 447 | serv->sv_module = mod; |
| 448 | } |
| 449 | |
| 450 | return serv; |
| 451 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 452 | EXPORT_SYMBOL_GPL(svc_create_pooled); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | /* |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 455 | * Destroy an RPC service. Should be called with appropriate locking to |
| 456 | * protect the sv_nrthreads, sv_permsocks and sv_tempsocks. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | */ |
| 458 | void |
| 459 | svc_destroy(struct svc_serv *serv) |
| 460 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 461 | dprintk("svc: svc_destroy(%s, %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | serv->sv_program->pg_name, |
| 463 | serv->sv_nrthreads); |
| 464 | |
| 465 | if (serv->sv_nrthreads) { |
| 466 | if (--(serv->sv_nrthreads) != 0) { |
| 467 | svc_sock_update_bufs(serv); |
| 468 | return; |
| 469 | } |
| 470 | } else |
| 471 | printk("svc_destroy: no threads for serv=%p!\n", serv); |
| 472 | |
Greg Banks | 36bdfc8 | 2006-10-02 02:17:54 -0700 | [diff] [blame] | 473 | del_timer_sync(&serv->sv_temptimer); |
| 474 | |
Tom Tucker | 7a18208 | 2007-12-30 21:07:53 -0600 | [diff] [blame] | 475 | svc_close_all(&serv->sv_tempsocks); |
NeilBrown | cda1fd4 | 2007-03-06 01:42:22 -0800 | [diff] [blame] | 476 | |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 477 | if (serv->sv_shutdown) |
| 478 | serv->sv_shutdown(serv); |
| 479 | |
Tom Tucker | 7a18208 | 2007-12-30 21:07:53 -0600 | [diff] [blame] | 480 | svc_close_all(&serv->sv_permsocks); |
NeilBrown | cda1fd4 | 2007-03-06 01:42:22 -0800 | [diff] [blame] | 481 | |
| 482 | BUG_ON(!list_empty(&serv->sv_permsocks)); |
| 483 | BUG_ON(!list_empty(&serv->sv_tempsocks)); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 484 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | cache_clean_deferred(serv); |
| 486 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 487 | if (svc_serv_is_pooled(serv)) |
| 488 | svc_pool_map_put(); |
| 489 | |
Andy Adamson | 9c9f3f5 | 2009-04-01 09:23:10 -0400 | [diff] [blame] | 490 | #if defined(CONFIG_NFS_V4_1) |
| 491 | svc_sock_destroy(serv->bc_xprt); |
| 492 | #endif /* CONFIG_NFS_V4_1 */ |
| 493 | |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 494 | svc_unregister(serv); |
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 | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 498 | EXPORT_SYMBOL_GPL(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 | { |
Chuck Lever | 0dc220f | 2008-04-14 12:27:52 -0400 | [diff] [blame] | 507 | unsigned int pages, arghi; |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 508 | |
NeilBrown | c6b0a9f | 2006-10-06 00:44:05 -0700 | [diff] [blame] | 509 | pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply. |
| 510 | * We assume one is at most one page |
| 511 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | arghi = 0; |
Kris Katterjohn | 09a6266 | 2006-01-08 22:24:28 -0800 | [diff] [blame] | 513 | BUG_ON(pages > RPCSVC_MAXPAGES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | while (pages) { |
| 515 | struct page *p = alloc_page(GFP_KERNEL); |
| 516 | if (!p) |
| 517 | break; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 518 | rqstp->rq_pages[arghi++] = p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | pages--; |
| 520 | } |
Chuck Lever | 0dc220f | 2008-04-14 12:27:52 -0400 | [diff] [blame] | 521 | return pages == 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | } |
| 523 | |
| 524 | /* |
| 525 | * Release an RPC server buffer |
| 526 | */ |
| 527 | static void |
| 528 | svc_release_buffer(struct svc_rqst *rqstp) |
| 529 | { |
Chuck Lever | 50c8bb1 | 2008-04-14 12:27:45 -0400 | [diff] [blame] | 530 | unsigned int i; |
| 531 | |
| 532 | for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++) |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 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 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 573 | EXPORT_SYMBOL_GPL(svc_prepare_thread); |
Jeff Layton | 0113ab3 | 2008-01-29 10:30:54 -0500 | [diff] [blame] | 574 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | /* |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 576 | * Choose a pool in which to create a new thread, for svc_set_num_threads |
| 577 | */ |
| 578 | static inline struct svc_pool * |
| 579 | choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) |
| 580 | { |
| 581 | if (pool != NULL) |
| 582 | return pool; |
| 583 | |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 584 | return &serv->sv_pools[(*state)++ % serv->sv_nrpools]; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 585 | } |
| 586 | |
| 587 | /* |
| 588 | * Choose a thread to kill, for svc_set_num_threads |
| 589 | */ |
| 590 | static inline struct task_struct * |
| 591 | choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) |
| 592 | { |
| 593 | unsigned int i; |
| 594 | struct task_struct *task = NULL; |
| 595 | |
| 596 | if (pool != NULL) { |
| 597 | spin_lock_bh(&pool->sp_lock); |
| 598 | } else { |
| 599 | /* choose a pool in round-robin fashion */ |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 600 | for (i = 0; i < serv->sv_nrpools; i++) { |
| 601 | pool = &serv->sv_pools[--(*state) % serv->sv_nrpools]; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 602 | spin_lock_bh(&pool->sp_lock); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 603 | if (!list_empty(&pool->sp_all_threads)) |
| 604 | goto found_pool; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 605 | spin_unlock_bh(&pool->sp_lock); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 606 | } |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 607 | return NULL; |
| 608 | } |
| 609 | |
| 610 | found_pool: |
| 611 | if (!list_empty(&pool->sp_all_threads)) { |
| 612 | struct svc_rqst *rqstp; |
| 613 | |
| 614 | /* |
| 615 | * Remove from the pool->sp_all_threads list |
| 616 | * so we don't try to kill it again. |
| 617 | */ |
| 618 | rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all); |
| 619 | list_del_init(&rqstp->rq_all); |
| 620 | task = rqstp->rq_task; |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 621 | } |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 622 | spin_unlock_bh(&pool->sp_lock); |
| 623 | |
| 624 | return task; |
| 625 | } |
| 626 | |
| 627 | /* |
| 628 | * Create or destroy enough new threads to make the number |
| 629 | * of threads the given number. If `pool' is non-NULL, applies |
| 630 | * only to threads in that pool, otherwise round-robins between |
| 631 | * all pools. Must be called with a svc_get() reference and |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 632 | * the BKL or another lock to protect access to svc_serv fields. |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 633 | * |
| 634 | * Destroying threads relies on the service threads filling in |
| 635 | * rqstp->rq_task, which only the nfs ones do. Assumes the serv |
| 636 | * has been created using svc_create_pooled(). |
| 637 | * |
| 638 | * Based on code that used to be in nfsd_svc() but tweaked |
| 639 | * to be pool-aware. |
| 640 | */ |
| 641 | int |
| 642 | svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) |
| 643 | { |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 644 | struct svc_rqst *rqstp; |
| 645 | struct task_struct *task; |
| 646 | struct svc_pool *chosen_pool; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 647 | int error = 0; |
| 648 | unsigned int state = serv->sv_nrthreads-1; |
| 649 | |
| 650 | if (pool == NULL) { |
| 651 | /* The -1 assumes caller has done a svc_get() */ |
| 652 | nrservs -= (serv->sv_nrthreads-1); |
| 653 | } else { |
| 654 | spin_lock_bh(&pool->sp_lock); |
| 655 | nrservs -= pool->sp_nrthreads; |
| 656 | spin_unlock_bh(&pool->sp_lock); |
| 657 | } |
| 658 | |
| 659 | /* create new threads */ |
| 660 | while (nrservs > 0) { |
| 661 | nrservs--; |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 662 | chosen_pool = choose_pool(serv, pool, &state); |
| 663 | |
| 664 | rqstp = svc_prepare_thread(serv, chosen_pool); |
| 665 | if (IS_ERR(rqstp)) { |
| 666 | error = PTR_ERR(rqstp); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 667 | break; |
| 668 | } |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 669 | |
| 670 | __module_get(serv->sv_module); |
| 671 | task = kthread_create(serv->sv_function, rqstp, serv->sv_name); |
| 672 | if (IS_ERR(task)) { |
| 673 | error = PTR_ERR(task); |
| 674 | module_put(serv->sv_module); |
| 675 | svc_exit_thread(rqstp); |
| 676 | break; |
| 677 | } |
| 678 | |
| 679 | rqstp->rq_task = task; |
| 680 | if (serv->sv_nrpools > 1) |
| 681 | svc_pool_map_set_cpumask(task, chosen_pool->sp_id); |
| 682 | |
| 683 | svc_sock_update_bufs(serv); |
| 684 | wake_up_process(task); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 685 | } |
| 686 | /* destroy old threads */ |
| 687 | while (nrservs < 0 && |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 688 | (task = choose_victim(serv, pool, &state)) != NULL) { |
Jeff Layton | a75c5d0 | 2008-06-10 08:40:39 -0400 | [diff] [blame] | 689 | send_sig(SIGINT, task, 1); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 690 | nrservs++; |
| 691 | } |
| 692 | |
| 693 | return error; |
| 694 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 695 | EXPORT_SYMBOL_GPL(svc_set_num_threads); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 696 | |
| 697 | /* |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 698 | * Called from a server thread as it's exiting. Caller must hold the BKL or |
| 699 | * the "service mutex", whichever is appropriate for the service. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | */ |
| 701 | void |
| 702 | svc_exit_thread(struct svc_rqst *rqstp) |
| 703 | { |
| 704 | struct svc_serv *serv = rqstp->rq_server; |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 705 | struct svc_pool *pool = rqstp->rq_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
| 707 | svc_release_buffer(rqstp); |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 708 | kfree(rqstp->rq_resp); |
| 709 | kfree(rqstp->rq_argp); |
| 710 | kfree(rqstp->rq_auth_data); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 711 | |
| 712 | spin_lock_bh(&pool->sp_lock); |
| 713 | pool->sp_nrthreads--; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 714 | list_del(&rqstp->rq_all); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 715 | spin_unlock_bh(&pool->sp_lock); |
| 716 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | kfree(rqstp); |
| 718 | |
| 719 | /* Release the server */ |
| 720 | if (serv) |
| 721 | svc_destroy(serv); |
| 722 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 723 | EXPORT_SYMBOL_GPL(svc_exit_thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | |
| 725 | /* |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 726 | * Register an "inet" protocol family netid with the local |
| 727 | * rpcbind daemon via an rpcbind v4 SET request. |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 728 | * |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 729 | * No netconfig infrastructure is available in the kernel, so |
| 730 | * we map IP_ protocol numbers to netids by hand. |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 731 | * |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 732 | * Returns zero on success; a negative errno value is returned |
| 733 | * if any error occurs. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | */ |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 735 | static int __svc_rpcb_register4(const u32 program, const u32 version, |
| 736 | const unsigned short protocol, |
| 737 | const unsigned short port) |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 738 | { |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 739 | const struct sockaddr_in sin = { |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 740 | .sin_family = AF_INET, |
| 741 | .sin_addr.s_addr = htonl(INADDR_ANY), |
| 742 | .sin_port = htons(port), |
| 743 | }; |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 744 | const char *netid; |
| 745 | int error; |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 746 | |
| 747 | switch (protocol) { |
| 748 | case IPPROTO_UDP: |
| 749 | netid = RPCBIND_NETID_UDP; |
| 750 | break; |
| 751 | case IPPROTO_TCP: |
| 752 | netid = RPCBIND_NETID_TCP; |
| 753 | break; |
| 754 | default: |
Chuck Lever | ba5c35e | 2009-03-18 20:46:59 -0400 | [diff] [blame] | 755 | return -ENOPROTOOPT; |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 756 | } |
| 757 | |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 758 | error = rpcb_v4_register(program, version, |
| 759 | (const struct sockaddr *)&sin, netid); |
| 760 | |
| 761 | /* |
| 762 | * User space didn't support rpcbind v4, so retry this |
| 763 | * registration request with the legacy rpcbind v2 protocol. |
| 764 | */ |
| 765 | if (error == -EPROTONOSUPPORT) |
| 766 | error = rpcb_register(program, version, protocol, port); |
| 767 | |
| 768 | return error; |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 769 | } |
| 770 | |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 771 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 772 | /* |
| 773 | * Register an "inet6" protocol family netid with the local |
| 774 | * rpcbind daemon via an rpcbind v4 SET request. |
| 775 | * |
| 776 | * No netconfig infrastructure is available in the kernel, so |
| 777 | * we map IP_ protocol numbers to netids by hand. |
| 778 | * |
| 779 | * Returns zero on success; a negative errno value is returned |
| 780 | * if any error occurs. |
| 781 | */ |
| 782 | static int __svc_rpcb_register6(const u32 program, const u32 version, |
| 783 | const unsigned short protocol, |
| 784 | const unsigned short port) |
| 785 | { |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 786 | const struct sockaddr_in6 sin6 = { |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 787 | .sin6_family = AF_INET6, |
| 788 | .sin6_addr = IN6ADDR_ANY_INIT, |
| 789 | .sin6_port = htons(port), |
| 790 | }; |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 791 | const char *netid; |
| 792 | int error; |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 793 | |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 794 | switch (protocol) { |
| 795 | case IPPROTO_UDP: |
| 796 | netid = RPCBIND_NETID_UDP6; |
| 797 | break; |
| 798 | case IPPROTO_TCP: |
| 799 | netid = RPCBIND_NETID_TCP6; |
| 800 | break; |
| 801 | default: |
Chuck Lever | ba5c35e | 2009-03-18 20:46:59 -0400 | [diff] [blame] | 802 | return -ENOPROTOOPT; |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 803 | } |
| 804 | |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 805 | error = rpcb_v4_register(program, version, |
| 806 | (const struct sockaddr *)&sin6, netid); |
| 807 | |
| 808 | /* |
| 809 | * User space didn't support rpcbind version 4, so we won't |
| 810 | * use a PF_INET6 listener. |
| 811 | */ |
| 812 | if (error == -EPROTONOSUPPORT) |
| 813 | error = -EAFNOSUPPORT; |
| 814 | |
| 815 | return error; |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 816 | } |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 817 | #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 818 | |
| 819 | /* |
| 820 | * Register a kernel RPC service via rpcbind version 4. |
| 821 | * |
| 822 | * Returns zero on success; a negative errno value is returned |
| 823 | * if any error occurs. |
| 824 | */ |
Chuck Lever | 363f724 | 2009-03-18 20:47:44 -0400 | [diff] [blame] | 825 | static int __svc_register(const char *progname, |
| 826 | const u32 program, const u32 version, |
Chuck Lever | 4b62e58 | 2009-03-18 20:46:06 -0400 | [diff] [blame] | 827 | const int family, |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 828 | const unsigned short protocol, |
| 829 | const unsigned short port) |
| 830 | { |
Chuck Lever | 363f724 | 2009-03-18 20:47:44 -0400 | [diff] [blame] | 831 | int error = -EAFNOSUPPORT; |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 832 | |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 833 | switch (family) { |
Chuck Lever | 4b62e58 | 2009-03-18 20:46:06 -0400 | [diff] [blame] | 834 | case PF_INET: |
Chuck Lever | 363f724 | 2009-03-18 20:47:44 -0400 | [diff] [blame] | 835 | error = __svc_rpcb_register4(program, version, |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 836 | protocol, port); |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 837 | break; |
| 838 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Chuck Lever | 4b62e58 | 2009-03-18 20:46:06 -0400 | [diff] [blame] | 839 | case PF_INET6: |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 840 | error = __svc_rpcb_register6(program, version, |
| 841 | protocol, port); |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 842 | #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 843 | } |
| 844 | |
Chuck Lever | 363f724 | 2009-03-18 20:47:44 -0400 | [diff] [blame] | 845 | if (error < 0) |
| 846 | printk(KERN_WARNING "svc: failed to register %sv%u RPC " |
| 847 | "service (errno %d).\n", progname, version, -error); |
| 848 | return error; |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 849 | } |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 850 | |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 851 | /** |
| 852 | * svc_register - register an RPC service with the local portmapper |
| 853 | * @serv: svc_serv struct for the service to register |
Chuck Lever | 4b62e58 | 2009-03-18 20:46:06 -0400 | [diff] [blame] | 854 | * @family: protocol family of service's listener socket |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 855 | * @proto: transport protocol number to advertise |
| 856 | * @port: port to advertise |
| 857 | * |
Chuck Lever | 4b62e58 | 2009-03-18 20:46:06 -0400 | [diff] [blame] | 858 | * Service is registered for any address in the passed-in protocol family |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 859 | */ |
Chuck Lever | 4b62e58 | 2009-03-18 20:46:06 -0400 | [diff] [blame] | 860 | int svc_register(const struct svc_serv *serv, const int family, |
| 861 | const unsigned short proto, const unsigned short port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | { |
| 863 | struct svc_program *progp; |
Chuck Lever | ea339d4 | 2007-10-26 13:32:56 -0400 | [diff] [blame] | 864 | unsigned int i; |
Chuck Lever | 14aeb21 | 2008-08-18 19:34:00 -0400 | [diff] [blame] | 865 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 867 | BUG_ON(proto == 0 && port == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 869 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { |
| 870 | for (i = 0; i < progp->pg_nvers; i++) { |
| 871 | if (progp->pg_vers[i] == NULL) |
| 872 | continue; |
| 873 | |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 874 | dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n", |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 875 | progp->pg_name, |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 876 | i, |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 877 | proto == IPPROTO_UDP? "udp" : "tcp", |
| 878 | port, |
Chuck Lever | 4b62e58 | 2009-03-18 20:46:06 -0400 | [diff] [blame] | 879 | family, |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 880 | progp->pg_vers[i]->vs_hidden? |
| 881 | " (but not telling portmap)" : ""); |
| 882 | |
| 883 | if (progp->pg_vers[i]->vs_hidden) |
| 884 | continue; |
| 885 | |
Chuck Lever | 363f724 | 2009-03-18 20:47:44 -0400 | [diff] [blame] | 886 | error = __svc_register(progp->pg_name, progp->pg_prog, |
| 887 | i, family, proto, port); |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 888 | if (error < 0) |
| 889 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | } |
| 891 | } |
| 892 | |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 893 | return error; |
| 894 | } |
| 895 | |
Chuck Lever | d5a8620 | 2009-03-18 20:47:29 -0400 | [diff] [blame] | 896 | /* |
| 897 | * If user space is running rpcbind, it should take the v4 UNSET |
| 898 | * and clear everything for this [program, version]. If user space |
| 899 | * is running portmap, it will reject the v4 UNSET, but won't have |
| 900 | * any "inet6" entries anyway. So a PMAP_UNSET should be sufficient |
| 901 | * in this case to clear all existing entries for [program, version]. |
| 902 | */ |
Chuck Lever | f6fb3f6 | 2008-09-25 11:56:57 -0400 | [diff] [blame] | 903 | static void __svc_unregister(const u32 program, const u32 version, |
| 904 | const char *progname) |
| 905 | { |
| 906 | int error; |
| 907 | |
Chuck Lever | d5a8620 | 2009-03-18 20:47:29 -0400 | [diff] [blame] | 908 | error = rpcb_v4_register(program, version, NULL, ""); |
| 909 | |
| 910 | /* |
| 911 | * User space didn't support rpcbind v4, so retry this |
| 912 | * request with the legacy rpcbind v2 protocol. |
| 913 | */ |
| 914 | if (error == -EPROTONOSUPPORT) |
| 915 | error = rpcb_register(program, version, 0, 0); |
| 916 | |
Chuck Lever | f6fb3f6 | 2008-09-25 11:56:57 -0400 | [diff] [blame] | 917 | dprintk("svc: %s(%sv%u), error %d\n", |
| 918 | __func__, progname, version, error); |
| 919 | } |
| 920 | |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 921 | /* |
Chuck Lever | f6fb3f6 | 2008-09-25 11:56:57 -0400 | [diff] [blame] | 922 | * All netids, bind addresses and ports registered for [program, version] |
| 923 | * are removed from the local rpcbind database (if the service is not |
| 924 | * hidden) to make way for a new instance of the service. |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 925 | * |
Chuck Lever | f6fb3f6 | 2008-09-25 11:56:57 -0400 | [diff] [blame] | 926 | * The result of unregistration is reported via dprintk for those who want |
| 927 | * verification of the result, but is otherwise not important. |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 928 | */ |
| 929 | static void svc_unregister(const struct svc_serv *serv) |
| 930 | { |
| 931 | struct svc_program *progp; |
| 932 | unsigned long flags; |
| 933 | unsigned int i; |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 934 | |
| 935 | clear_thread_flag(TIF_SIGPENDING); |
| 936 | |
| 937 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { |
| 938 | for (i = 0; i < progp->pg_nvers; i++) { |
| 939 | if (progp->pg_vers[i] == NULL) |
| 940 | continue; |
| 941 | if (progp->pg_vers[i]->vs_hidden) |
| 942 | continue; |
| 943 | |
Chuck Lever | f6fb3f6 | 2008-09-25 11:56:57 -0400 | [diff] [blame] | 944 | __svc_unregister(progp->pg_prog, i, progp->pg_name); |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 945 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | } |
| 947 | |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 948 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
| 949 | recalc_sigpending(); |
| 950 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | } |
| 952 | |
| 953 | /* |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 954 | * Printk the given error with the address of the client that caused it. |
| 955 | */ |
| 956 | static int |
| 957 | __attribute__ ((format (printf, 2, 3))) |
| 958 | svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) |
| 959 | { |
| 960 | va_list args; |
| 961 | int r; |
| 962 | char buf[RPC_MAX_ADDRBUFLEN]; |
| 963 | |
| 964 | if (!net_ratelimit()) |
| 965 | return 0; |
| 966 | |
| 967 | printk(KERN_WARNING "svc: %s: ", |
| 968 | svc_print_addr(rqstp, buf, sizeof(buf))); |
| 969 | |
| 970 | va_start(args, fmt); |
| 971 | r = vprintk(fmt, args); |
| 972 | va_end(args); |
| 973 | |
| 974 | return r; |
| 975 | } |
| 976 | |
| 977 | /* |
Ricardo Labiaga | 1cad7ea | 2009-04-01 09:23:06 -0400 | [diff] [blame] | 978 | * Common routine for processing the RPC request. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | */ |
Ricardo Labiaga | 1cad7ea | 2009-04-01 09:23:06 -0400 | [diff] [blame] | 980 | static int |
| 981 | svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | { |
| 983 | struct svc_program *progp; |
| 984 | struct svc_version *versp = NULL; /* compiler food */ |
| 985 | struct svc_procedure *procp = NULL; |
NeilBrown | 6fb2b47 | 2006-10-02 02:17:50 -0700 | [diff] [blame] | 986 | struct svc_serv *serv = rqstp->rq_server; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | kxdrproc_t xdr; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 988 | __be32 *statp; |
Ricardo Labiaga | 1cad7ea | 2009-04-01 09:23:06 -0400 | [diff] [blame] | 989 | u32 prog, vers, proc; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 990 | __be32 auth_stat, rpc_stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | int auth_res; |
J.Bruce Fields | 8f8e05c | 2006-10-04 02:16:08 -0700 | [diff] [blame] | 992 | __be32 *reply_statp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | |
| 994 | rpc_stat = rpc_success; |
| 995 | |
| 996 | if (argv->iov_len < 6*4) |
| 997 | goto err_short_len; |
| 998 | |
J. Bruce Fields | 5c04c46 | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 999 | /* Will be turned off only in gss privacy case: */ |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 1000 | rqstp->rq_splice_ok = 1; |
Andy Adamson | 2f42587 | 2009-04-03 08:27:32 +0300 | [diff] [blame] | 1001 | /* Will be turned off only when NFSv4 Sessions are used */ |
| 1002 | rqstp->rq_usedeferral = 1; |
Tom Tucker | e831fe6 | 2007-12-30 21:07:29 -0600 | [diff] [blame] | 1003 | |
| 1004 | /* Setup reply header */ |
| 1005 | rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | svc_putu32(resv, rqstp->rq_xid); |
| 1008 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1009 | vers = svc_getnl(argv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | |
| 1011 | /* First words of reply: */ |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1012 | svc_putnl(resv, 1); /* REPLY */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | if (vers != 2) /* RPC version number */ |
| 1015 | goto err_bad_rpc; |
| 1016 | |
| 1017 | /* Save position in case we later decide to reject: */ |
J.Bruce Fields | 8f8e05c | 2006-10-04 02:16:08 -0700 | [diff] [blame] | 1018 | reply_statp = resv->iov_base + resv->iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1020 | svc_putnl(resv, 0); /* ACCEPT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1022 | rqstp->rq_prog = prog = svc_getnl(argv); /* program number */ |
| 1023 | rqstp->rq_vers = vers = svc_getnl(argv); /* version number */ |
| 1024 | rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | |
| 1026 | progp = serv->sv_program; |
NeilBrown | 80d188a | 2005-11-07 01:00:27 -0800 | [diff] [blame] | 1027 | |
| 1028 | for (progp = serv->sv_program; progp; progp = progp->pg_next) |
| 1029 | if (prog == progp->pg_prog) |
| 1030 | break; |
| 1031 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | /* |
| 1033 | * Decode auth data, and add verifier to reply buffer. |
| 1034 | * We do this before anything else in order to get a decent |
| 1035 | * auth verifier. |
| 1036 | */ |
| 1037 | auth_res = svc_authenticate(rqstp, &auth_stat); |
| 1038 | /* Also give the program a chance to reject this call: */ |
NeilBrown | 80d188a | 2005-11-07 01:00:27 -0800 | [diff] [blame] | 1039 | if (auth_res == SVC_OK && progp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | auth_stat = rpc_autherr_badcred; |
| 1041 | auth_res = progp->pg_authenticate(rqstp); |
| 1042 | } |
| 1043 | switch (auth_res) { |
| 1044 | case SVC_OK: |
| 1045 | break; |
| 1046 | case SVC_GARBAGE: |
Harshula Jayasuriya | dd35210 | 2008-02-20 10:56:56 +1100 | [diff] [blame] | 1047 | goto err_garbage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | case SVC_SYSERR: |
| 1049 | rpc_stat = rpc_system_err; |
| 1050 | goto err_bad; |
| 1051 | case SVC_DENIED: |
| 1052 | goto err_bad_auth; |
| 1053 | case SVC_DROP: |
| 1054 | goto dropit; |
| 1055 | case SVC_COMPLETE: |
| 1056 | goto sendit; |
| 1057 | } |
NeilBrown | 80d188a | 2005-11-07 01:00:27 -0800 | [diff] [blame] | 1058 | |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 1059 | if (progp == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | goto err_bad_prog; |
| 1061 | |
| 1062 | if (vers >= progp->pg_nvers || |
| 1063 | !(versp = progp->pg_vers[vers])) |
| 1064 | goto err_bad_vers; |
| 1065 | |
| 1066 | procp = versp->vs_proc + proc; |
| 1067 | if (proc >= versp->vs_nproc || !procp->pc_func) |
| 1068 | goto err_bad_proc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | rqstp->rq_procinfo = procp; |
| 1070 | |
| 1071 | /* Syntactic check complete */ |
| 1072 | serv->sv_stats->rpccnt++; |
| 1073 | |
| 1074 | /* Build the reply header. */ |
| 1075 | statp = resv->iov_base +resv->iov_len; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1076 | svc_putnl(resv, RPC_SUCCESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | |
| 1078 | /* Bump per-procedure stats counter */ |
| 1079 | procp->pc_count++; |
| 1080 | |
| 1081 | /* Initialize storage for argp and resp */ |
| 1082 | memset(rqstp->rq_argp, 0, procp->pc_argsize); |
| 1083 | memset(rqstp->rq_resp, 0, procp->pc_ressize); |
| 1084 | |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 1085 | /* un-reserve some of the out-queue now that we have a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | * better idea of reply size |
| 1087 | */ |
| 1088 | if (procp->pc_xdrressize) |
Jeff Layton | cd12301 | 2007-05-09 02:34:50 -0700 | [diff] [blame] | 1089 | svc_reserve_auth(rqstp, procp->pc_xdrressize<<2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | |
| 1091 | /* Call the function that processes the request. */ |
| 1092 | if (!versp->vs_dispatch) { |
| 1093 | /* Decode arguments */ |
| 1094 | xdr = procp->pc_decode; |
| 1095 | if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp)) |
| 1096 | goto err_garbage; |
| 1097 | |
| 1098 | *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); |
| 1099 | |
| 1100 | /* Encode reply */ |
NeilBrown | d343fce | 2006-10-17 00:10:18 -0700 | [diff] [blame] | 1101 | if (*statp == rpc_drop_reply) { |
| 1102 | if (procp->pc_release) |
| 1103 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); |
| 1104 | goto dropit; |
| 1105 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | if (*statp == rpc_success && (xdr = procp->pc_encode) |
| 1107 | && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) { |
| 1108 | dprintk("svc: failed to encode reply\n"); |
| 1109 | /* serv->sv_stats->rpcsystemerr++; */ |
| 1110 | *statp = rpc_system_err; |
| 1111 | } |
| 1112 | } else { |
| 1113 | dprintk("svc: calling dispatcher\n"); |
| 1114 | if (!versp->vs_dispatch(rqstp, statp)) { |
| 1115 | /* Release reply info */ |
| 1116 | if (procp->pc_release) |
| 1117 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); |
| 1118 | goto dropit; |
| 1119 | } |
| 1120 | } |
| 1121 | |
| 1122 | /* Check RPC status result */ |
| 1123 | if (*statp != rpc_success) |
| 1124 | resv->iov_len = ((void*)statp) - resv->iov_base + 4; |
| 1125 | |
| 1126 | /* Release reply info */ |
| 1127 | if (procp->pc_release) |
| 1128 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); |
| 1129 | |
| 1130 | if (procp->pc_encode == NULL) |
| 1131 | goto dropit; |
| 1132 | |
| 1133 | sendit: |
| 1134 | if (svc_authorise(rqstp)) |
| 1135 | goto dropit; |
Ricardo Labiaga | 1cad7ea | 2009-04-01 09:23:06 -0400 | [diff] [blame] | 1136 | return 1; /* Caller can now send it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | |
| 1138 | dropit: |
| 1139 | svc_authorise(rqstp); /* doesn't hurt to call this twice */ |
| 1140 | dprintk("svc: svc_process dropit\n"); |
| 1141 | svc_drop(rqstp); |
| 1142 | return 0; |
| 1143 | |
| 1144 | err_short_len: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1145 | svc_printk(rqstp, "short len %Zd, dropping request\n", |
| 1146 | argv->iov_len); |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1147 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | goto dropit; /* drop request */ |
| 1149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | err_bad_rpc: |
| 1151 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1152 | svc_putnl(resv, 1); /* REJECT */ |
| 1153 | svc_putnl(resv, 0); /* RPC_MISMATCH */ |
| 1154 | svc_putnl(resv, 2); /* Only RPCv2 supported */ |
| 1155 | svc_putnl(resv, 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | goto sendit; |
| 1157 | |
| 1158 | err_bad_auth: |
| 1159 | dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat)); |
| 1160 | serv->sv_stats->rpcbadauth++; |
| 1161 | /* Restore write pointer to location of accept status: */ |
J.Bruce Fields | 8f8e05c | 2006-10-04 02:16:08 -0700 | [diff] [blame] | 1162 | xdr_ressize_check(rqstp, reply_statp); |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1163 | svc_putnl(resv, 1); /* REJECT */ |
| 1164 | svc_putnl(resv, 1); /* AUTH_ERROR */ |
| 1165 | svc_putnl(resv, ntohl(auth_stat)); /* status */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | goto sendit; |
| 1167 | |
| 1168 | err_bad_prog: |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 1169 | dprintk("svc: unknown program %d\n", prog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1171 | svc_putnl(resv, RPC_PROG_UNAVAIL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | goto sendit; |
| 1173 | |
| 1174 | err_bad_vers: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1175 | svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n", |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1176 | vers, prog, progp->pg_name); |
| 1177 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1179 | svc_putnl(resv, RPC_PROG_MISMATCH); |
| 1180 | svc_putnl(resv, progp->pg_lovers); |
| 1181 | svc_putnl(resv, progp->pg_hivers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | goto sendit; |
| 1183 | |
| 1184 | err_bad_proc: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1185 | svc_printk(rqstp, "unknown procedure (%d)\n", proc); |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1186 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1188 | svc_putnl(resv, RPC_PROC_UNAVAIL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | goto sendit; |
| 1190 | |
| 1191 | err_garbage: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1192 | svc_printk(rqstp, "failed to decode args\n"); |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | rpc_stat = rpc_garbage_args; |
| 1195 | err_bad: |
| 1196 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1197 | svc_putnl(resv, ntohl(rpc_stat)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | goto sendit; |
| 1199 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 1200 | EXPORT_SYMBOL_GPL(svc_process); |
Greg Banks | 7adae48 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1201 | |
| 1202 | /* |
Ricardo Labiaga | 1cad7ea | 2009-04-01 09:23:06 -0400 | [diff] [blame] | 1203 | * Process the RPC request. |
| 1204 | */ |
| 1205 | int |
| 1206 | svc_process(struct svc_rqst *rqstp) |
| 1207 | { |
| 1208 | struct kvec *argv = &rqstp->rq_arg.head[0]; |
| 1209 | struct kvec *resv = &rqstp->rq_res.head[0]; |
| 1210 | struct svc_serv *serv = rqstp->rq_server; |
| 1211 | u32 dir; |
| 1212 | int error; |
| 1213 | |
| 1214 | /* |
| 1215 | * Setup response xdr_buf. |
| 1216 | * Initially it has just one page |
| 1217 | */ |
| 1218 | rqstp->rq_resused = 1; |
| 1219 | resv->iov_base = page_address(rqstp->rq_respages[0]); |
| 1220 | resv->iov_len = 0; |
| 1221 | rqstp->rq_res.pages = rqstp->rq_respages + 1; |
| 1222 | rqstp->rq_res.len = 0; |
| 1223 | rqstp->rq_res.page_base = 0; |
| 1224 | rqstp->rq_res.page_len = 0; |
| 1225 | rqstp->rq_res.buflen = PAGE_SIZE; |
| 1226 | rqstp->rq_res.tail[0].iov_base = NULL; |
| 1227 | rqstp->rq_res.tail[0].iov_len = 0; |
| 1228 | |
| 1229 | rqstp->rq_xid = svc_getu32(argv); |
| 1230 | |
| 1231 | dir = svc_getnl(argv); |
| 1232 | if (dir != 0) { |
| 1233 | /* direction != CALL */ |
| 1234 | svc_printk(rqstp, "bad direction %d, dropping request\n", dir); |
| 1235 | serv->sv_stats->rpcbadfmt++; |
| 1236 | svc_drop(rqstp); |
| 1237 | return 0; |
| 1238 | } |
| 1239 | |
| 1240 | error = svc_process_common(rqstp, argv, resv); |
| 1241 | if (error <= 0) |
| 1242 | return error; |
| 1243 | |
| 1244 | return svc_send(rqstp); |
| 1245 | } |
| 1246 | |
Ricardo Labiaga | 4d6bbb6 | 2009-04-01 09:23:07 -0400 | [diff] [blame] | 1247 | #if defined(CONFIG_NFS_V4_1) |
| 1248 | /* |
| 1249 | * Process a backchannel RPC request that arrived over an existing |
| 1250 | * outbound connection |
| 1251 | */ |
| 1252 | int |
| 1253 | bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req, |
| 1254 | struct svc_rqst *rqstp) |
| 1255 | { |
| 1256 | struct kvec *argv = &rqstp->rq_arg.head[0]; |
| 1257 | struct kvec *resv = &rqstp->rq_res.head[0]; |
| 1258 | int error; |
| 1259 | |
| 1260 | /* Build the svc_rqst used by the common processing routine */ |
Benny Halevy | 8f97524 | 2009-04-01 09:23:11 -0400 | [diff] [blame] | 1261 | rqstp->rq_xprt = serv->bc_xprt; |
Ricardo Labiaga | 4d6bbb6 | 2009-04-01 09:23:07 -0400 | [diff] [blame] | 1262 | rqstp->rq_xid = req->rq_xid; |
| 1263 | rqstp->rq_prot = req->rq_xprt->prot; |
| 1264 | rqstp->rq_server = serv; |
| 1265 | |
| 1266 | rqstp->rq_addrlen = sizeof(req->rq_xprt->addr); |
| 1267 | memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen); |
| 1268 | memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg)); |
| 1269 | memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res)); |
| 1270 | |
| 1271 | /* reset result send buffer "put" position */ |
| 1272 | resv->iov_len = 0; |
| 1273 | |
| 1274 | if (rqstp->rq_prot != IPPROTO_TCP) { |
| 1275 | printk(KERN_ERR "No support for Non-TCP transports!\n"); |
| 1276 | BUG(); |
| 1277 | } |
| 1278 | |
| 1279 | /* |
| 1280 | * Skip the next two words because they've already been |
| 1281 | * processed in the trasport |
| 1282 | */ |
| 1283 | svc_getu32(argv); /* XID */ |
| 1284 | svc_getnl(argv); /* CALLDIR */ |
| 1285 | |
| 1286 | error = svc_process_common(rqstp, argv, resv); |
| 1287 | if (error <= 0) |
| 1288 | return error; |
| 1289 | |
| 1290 | memcpy(&req->rq_snd_buf, &rqstp->rq_res, sizeof(req->rq_snd_buf)); |
| 1291 | return bc_send(req); |
| 1292 | } |
| 1293 | EXPORT_SYMBOL(bc_svc_process); |
| 1294 | #endif /* CONFIG_NFS_V4_1 */ |
| 1295 | |
Ricardo Labiaga | 1cad7ea | 2009-04-01 09:23:06 -0400 | [diff] [blame] | 1296 | /* |
Greg Banks | 7adae48 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1297 | * Return (transport-specific) limit on the rpc payload. |
| 1298 | */ |
| 1299 | u32 svc_max_payload(const struct svc_rqst *rqstp) |
| 1300 | { |
Tom Tucker | 4902315 | 2007-12-30 21:07:21 -0600 | [diff] [blame] | 1301 | u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload; |
Greg Banks | 7adae48 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1302 | |
NeilBrown | c6b0a9f | 2006-10-06 00:44:05 -0700 | [diff] [blame] | 1303 | if (rqstp->rq_server->sv_max_payload < max) |
| 1304 | max = rqstp->rq_server->sv_max_payload; |
Greg Banks | 7adae48 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1305 | return max; |
| 1306 | } |
| 1307 | EXPORT_SYMBOL_GPL(svc_max_payload); |