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; |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 304 | |
| 305 | /* |
| 306 | * The caller checks for sv_nrpools > 1, which |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 307 | * implies that we've been initialized. |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 308 | */ |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 309 | BUG_ON(m->count == 0); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 310 | |
| 311 | switch (m->mode) |
| 312 | { |
| 313 | default: |
| 314 | return 0; |
| 315 | case SVC_POOL_PERCPU: |
Mike Travis | c5f59f0 | 2008-04-04 18:11:10 -0700 | [diff] [blame] | 316 | { |
| 317 | unsigned int cpu = m->pool_to[pidx]; |
| 318 | |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 319 | *oldmask = current->cpus_allowed; |
Mike Travis | c5f59f0 | 2008-04-04 18:11:10 -0700 | [diff] [blame] | 320 | set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu)); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 321 | return 1; |
Mike Travis | c5f59f0 | 2008-04-04 18:11:10 -0700 | [diff] [blame] | 322 | } |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 323 | case SVC_POOL_PERNODE: |
Mike Travis | c5f59f0 | 2008-04-04 18:11:10 -0700 | [diff] [blame] | 324 | { |
| 325 | unsigned int node = m->pool_to[pidx]; |
| 326 | node_to_cpumask_ptr(nodecpumask, node); |
| 327 | |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 328 | *oldmask = current->cpus_allowed; |
Mike Travis | c5f59f0 | 2008-04-04 18:11:10 -0700 | [diff] [blame] | 329 | set_cpus_allowed_ptr(current, nodecpumask); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 330 | return 1; |
| 331 | } |
Mike Travis | c5f59f0 | 2008-04-04 18:11:10 -0700 | [diff] [blame] | 332 | } |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 333 | } |
| 334 | |
| 335 | /* |
| 336 | * Use the mapping mode to choose a pool for a given CPU. |
| 337 | * Used when enqueueing an incoming RPC. Always returns |
| 338 | * a non-NULL pool pointer. |
| 339 | */ |
| 340 | struct svc_pool * |
| 341 | svc_pool_for_cpu(struct svc_serv *serv, int cpu) |
| 342 | { |
| 343 | struct svc_pool_map *m = &svc_pool_map; |
| 344 | unsigned int pidx = 0; |
| 345 | |
| 346 | /* |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 347 | * An uninitialised map happens in a pure client when |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 348 | * lockd is brought up, so silently treat it the |
| 349 | * same as SVC_POOL_GLOBAL. |
| 350 | */ |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 351 | if (svc_serv_is_pooled(serv)) { |
| 352 | switch (m->mode) { |
| 353 | case SVC_POOL_PERCPU: |
| 354 | pidx = m->to_pool[cpu]; |
| 355 | break; |
| 356 | case SVC_POOL_PERNODE: |
| 357 | pidx = m->to_pool[cpu_to_node(cpu)]; |
| 358 | break; |
| 359 | } |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 360 | } |
| 361 | return &serv->sv_pools[pidx % serv->sv_nrpools]; |
| 362 | } |
| 363 | |
| 364 | |
| 365 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | * Create an RPC service |
| 367 | */ |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 368 | static struct svc_serv * |
| 369 | __svc_create(struct svc_program *prog, unsigned int bufsize, int npools, |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 370 | void (*shutdown)(struct svc_serv *serv)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | { |
| 372 | struct svc_serv *serv; |
Chuck Lever | ea339d4 | 2007-10-26 13:32:56 -0400 | [diff] [blame] | 373 | unsigned int vers; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | unsigned int xdrsize; |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 375 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 377 | if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | return NULL; |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 379 | serv->sv_name = prog->pg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | serv->sv_program = prog; |
| 381 | serv->sv_nrthreads = 1; |
| 382 | serv->sv_stats = prog->pg_stats; |
NeilBrown | c6b0a9f | 2006-10-06 00:44:05 -0700 | [diff] [blame] | 383 | if (bufsize > RPCSVC_MAXPAYLOAD) |
| 384 | bufsize = RPCSVC_MAXPAYLOAD; |
| 385 | serv->sv_max_payload = bufsize? bufsize : 4096; |
| 386 | serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE); |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 387 | serv->sv_shutdown = shutdown; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | xdrsize = 0; |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 389 | while (prog) { |
| 390 | prog->pg_lovers = prog->pg_nvers-1; |
| 391 | for (vers=0; vers<prog->pg_nvers ; vers++) |
| 392 | if (prog->pg_vers[vers]) { |
| 393 | prog->pg_hivers = vers; |
| 394 | if (prog->pg_lovers > vers) |
| 395 | prog->pg_lovers = vers; |
| 396 | if (prog->pg_vers[vers]->vs_xdrsize > xdrsize) |
| 397 | xdrsize = prog->pg_vers[vers]->vs_xdrsize; |
| 398 | } |
| 399 | prog = prog->pg_next; |
| 400 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | serv->sv_xdrsize = xdrsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | INIT_LIST_HEAD(&serv->sv_tempsocks); |
| 403 | INIT_LIST_HEAD(&serv->sv_permsocks); |
Greg Banks | 36bdfc8 | 2006-10-02 02:17:54 -0700 | [diff] [blame] | 404 | init_timer(&serv->sv_temptimer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | spin_lock_init(&serv->sv_lock); |
| 406 | |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 407 | serv->sv_nrpools = npools; |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 408 | serv->sv_pools = |
Robert P. J. Day | cd86128 | 2006-12-13 00:34:52 -0800 | [diff] [blame] | 409 | kcalloc(serv->sv_nrpools, sizeof(struct svc_pool), |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 410 | GFP_KERNEL); |
| 411 | if (!serv->sv_pools) { |
| 412 | kfree(serv); |
| 413 | return NULL; |
| 414 | } |
| 415 | |
| 416 | for (i = 0; i < serv->sv_nrpools; i++) { |
| 417 | struct svc_pool *pool = &serv->sv_pools[i]; |
| 418 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 419 | dprintk("svc: initialising pool %u for %s\n", |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 420 | i, serv->sv_name); |
| 421 | |
| 422 | pool->sp_id = i; |
| 423 | INIT_LIST_HEAD(&pool->sp_threads); |
| 424 | INIT_LIST_HEAD(&pool->sp_sockets); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 425 | INIT_LIST_HEAD(&pool->sp_all_threads); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 426 | spin_lock_init(&pool->sp_lock); |
| 427 | } |
| 428 | |
| 429 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | /* Remove any stale portmap registrations */ |
| 431 | svc_register(serv, 0, 0); |
| 432 | |
| 433 | return serv; |
| 434 | } |
| 435 | |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 436 | struct svc_serv * |
| 437 | svc_create(struct svc_program *prog, unsigned int bufsize, |
| 438 | void (*shutdown)(struct svc_serv *serv)) |
| 439 | { |
| 440 | return __svc_create(prog, bufsize, /*npools*/1, shutdown); |
| 441 | } |
Trond Myklebust | d2f7e79 | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 442 | EXPORT_SYMBOL(svc_create); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 443 | |
| 444 | struct svc_serv * |
| 445 | svc_create_pooled(struct svc_program *prog, unsigned int bufsize, |
| 446 | void (*shutdown)(struct svc_serv *serv), |
| 447 | svc_thread_fn func, int sig, struct module *mod) |
| 448 | { |
| 449 | struct svc_serv *serv; |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 450 | unsigned int npools = svc_pool_map_get(); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 451 | |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 452 | serv = __svc_create(prog, bufsize, npools, shutdown); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 453 | |
| 454 | if (serv != NULL) { |
| 455 | serv->sv_function = func; |
| 456 | serv->sv_kill_signal = sig; |
| 457 | serv->sv_module = mod; |
| 458 | } |
| 459 | |
| 460 | return serv; |
| 461 | } |
Trond Myklebust | d2f7e79 | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 462 | EXPORT_SYMBOL(svc_create_pooled); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 463 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | /* |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 465 | * Destroy an RPC service. Should be called with the BKL held |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | */ |
| 467 | void |
| 468 | svc_destroy(struct svc_serv *serv) |
| 469 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 470 | dprintk("svc: svc_destroy(%s, %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | serv->sv_program->pg_name, |
| 472 | serv->sv_nrthreads); |
| 473 | |
| 474 | if (serv->sv_nrthreads) { |
| 475 | if (--(serv->sv_nrthreads) != 0) { |
| 476 | svc_sock_update_bufs(serv); |
| 477 | return; |
| 478 | } |
| 479 | } else |
| 480 | printk("svc_destroy: no threads for serv=%p!\n", serv); |
| 481 | |
Greg Banks | 36bdfc8 | 2006-10-02 02:17:54 -0700 | [diff] [blame] | 482 | del_timer_sync(&serv->sv_temptimer); |
| 483 | |
Tom Tucker | 7a18208 | 2007-12-30 21:07:53 -0600 | [diff] [blame] | 484 | svc_close_all(&serv->sv_tempsocks); |
NeilBrown | cda1fd4 | 2007-03-06 01:42:22 -0800 | [diff] [blame] | 485 | |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 486 | if (serv->sv_shutdown) |
| 487 | serv->sv_shutdown(serv); |
| 488 | |
Tom Tucker | 7a18208 | 2007-12-30 21:07:53 -0600 | [diff] [blame] | 489 | svc_close_all(&serv->sv_permsocks); |
NeilBrown | cda1fd4 | 2007-03-06 01:42:22 -0800 | [diff] [blame] | 490 | |
| 491 | BUG_ON(!list_empty(&serv->sv_permsocks)); |
| 492 | BUG_ON(!list_empty(&serv->sv_tempsocks)); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 493 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | cache_clean_deferred(serv); |
| 495 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 496 | if (svc_serv_is_pooled(serv)) |
| 497 | svc_pool_map_put(); |
| 498 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | /* Unregister service with the portmapper */ |
| 500 | svc_register(serv, 0, 0); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 501 | kfree(serv->sv_pools); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | kfree(serv); |
| 503 | } |
Trond Myklebust | d2f7e79 | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 504 | EXPORT_SYMBOL(svc_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | |
| 506 | /* |
| 507 | * Allocate an RPC server's buffer space. |
| 508 | * We allocate pages and place them in rq_argpages. |
| 509 | */ |
| 510 | static int |
| 511 | svc_init_buffer(struct svc_rqst *rqstp, unsigned int size) |
| 512 | { |
| 513 | int pages; |
| 514 | int arghi; |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 515 | |
NeilBrown | c6b0a9f | 2006-10-06 00:44:05 -0700 | [diff] [blame] | 516 | pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply. |
| 517 | * We assume one is at most one page |
| 518 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | arghi = 0; |
Kris Katterjohn | 09a6266 | 2006-01-08 22:24:28 -0800 | [diff] [blame] | 520 | BUG_ON(pages > RPCSVC_MAXPAGES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | while (pages) { |
| 522 | struct page *p = alloc_page(GFP_KERNEL); |
| 523 | if (!p) |
| 524 | break; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 525 | rqstp->rq_pages[arghi++] = p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | pages--; |
| 527 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | return ! pages; |
| 529 | } |
| 530 | |
| 531 | /* |
| 532 | * Release an RPC server buffer |
| 533 | */ |
| 534 | static void |
| 535 | svc_release_buffer(struct svc_rqst *rqstp) |
| 536 | { |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 537 | int i; |
| 538 | for (i=0; i<ARRAY_SIZE(rqstp->rq_pages); i++) |
| 539 | if (rqstp->rq_pages[i]) |
| 540 | put_page(rqstp->rq_pages[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | } |
| 542 | |
Jeff Layton | 0113ab3 | 2008-01-29 10:30:54 -0500 | [diff] [blame] | 543 | struct svc_rqst * |
| 544 | svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool) |
| 545 | { |
| 546 | struct svc_rqst *rqstp; |
| 547 | |
| 548 | rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL); |
| 549 | if (!rqstp) |
| 550 | goto out_enomem; |
| 551 | |
| 552 | init_waitqueue_head(&rqstp->rq_wait); |
| 553 | |
| 554 | serv->sv_nrthreads++; |
| 555 | spin_lock_bh(&pool->sp_lock); |
| 556 | pool->sp_nrthreads++; |
| 557 | list_add(&rqstp->rq_all, &pool->sp_all_threads); |
| 558 | spin_unlock_bh(&pool->sp_lock); |
| 559 | rqstp->rq_server = serv; |
| 560 | rqstp->rq_pool = pool; |
| 561 | |
| 562 | rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL); |
| 563 | if (!rqstp->rq_argp) |
| 564 | goto out_thread; |
| 565 | |
| 566 | rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL); |
| 567 | if (!rqstp->rq_resp) |
| 568 | goto out_thread; |
| 569 | |
| 570 | if (!svc_init_buffer(rqstp, serv->sv_max_mesg)) |
| 571 | goto out_thread; |
| 572 | |
| 573 | return rqstp; |
| 574 | out_thread: |
| 575 | svc_exit_thread(rqstp); |
| 576 | out_enomem: |
| 577 | return ERR_PTR(-ENOMEM); |
| 578 | } |
| 579 | EXPORT_SYMBOL(svc_prepare_thread); |
| 580 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | /* |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 582 | * Create a thread in the given pool. Caller must hold BKL. |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 583 | * On a NUMA or SMP machine, with a multi-pool serv, the thread |
| 584 | * will be restricted to run on the cpus belonging to the pool. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | */ |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 586 | static int |
| 587 | __svc_create_thread(svc_thread_fn func, struct svc_serv *serv, |
| 588 | struct svc_pool *pool) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | { |
| 590 | struct svc_rqst *rqstp; |
| 591 | int error = -ENOMEM; |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 592 | int have_oldmask = 0; |
Andrew Morton | c3bb257 | 2008-03-12 14:04:25 -0700 | [diff] [blame^] | 593 | cpumask_t uninitialized_var(oldmask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | |
Jeff Layton | 0113ab3 | 2008-01-29 10:30:54 -0500 | [diff] [blame] | 595 | rqstp = svc_prepare_thread(serv, pool); |
| 596 | if (IS_ERR(rqstp)) { |
| 597 | error = PTR_ERR(rqstp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | goto out; |
Jeff Layton | 0113ab3 | 2008-01-29 10:30:54 -0500 | [diff] [blame] | 599 | } |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 600 | |
| 601 | if (serv->sv_nrpools > 1) |
| 602 | have_oldmask = svc_pool_map_set_cpumask(pool->sp_id, &oldmask); |
| 603 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | error = kernel_thread((int (*)(void *)) func, rqstp, 0); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 605 | |
| 606 | if (have_oldmask) |
| 607 | set_cpus_allowed(current, oldmask); |
| 608 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | if (error < 0) |
| 610 | goto out_thread; |
| 611 | svc_sock_update_bufs(serv); |
| 612 | error = 0; |
| 613 | out: |
| 614 | return error; |
| 615 | |
| 616 | out_thread: |
| 617 | svc_exit_thread(rqstp); |
| 618 | goto out; |
| 619 | } |
| 620 | |
| 621 | /* |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 622 | * Create a thread in the default pool. Caller must hold BKL. |
| 623 | */ |
| 624 | int |
| 625 | svc_create_thread(svc_thread_fn func, struct svc_serv *serv) |
| 626 | { |
| 627 | return __svc_create_thread(func, serv, &serv->sv_pools[0]); |
| 628 | } |
Trond Myklebust | d2f7e79 | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 629 | EXPORT_SYMBOL(svc_create_thread); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 630 | |
| 631 | /* |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 632 | * Choose a pool in which to create a new thread, for svc_set_num_threads |
| 633 | */ |
| 634 | static inline struct svc_pool * |
| 635 | choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) |
| 636 | { |
| 637 | if (pool != NULL) |
| 638 | return pool; |
| 639 | |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 640 | return &serv->sv_pools[(*state)++ % serv->sv_nrpools]; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 641 | } |
| 642 | |
| 643 | /* |
| 644 | * Choose a thread to kill, for svc_set_num_threads |
| 645 | */ |
| 646 | static inline struct task_struct * |
| 647 | choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) |
| 648 | { |
| 649 | unsigned int i; |
| 650 | struct task_struct *task = NULL; |
| 651 | |
| 652 | if (pool != NULL) { |
| 653 | spin_lock_bh(&pool->sp_lock); |
| 654 | } else { |
| 655 | /* choose a pool in round-robin fashion */ |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 656 | for (i = 0; i < serv->sv_nrpools; i++) { |
| 657 | pool = &serv->sv_pools[--(*state) % serv->sv_nrpools]; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 658 | spin_lock_bh(&pool->sp_lock); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 659 | if (!list_empty(&pool->sp_all_threads)) |
| 660 | goto found_pool; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 661 | spin_unlock_bh(&pool->sp_lock); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 662 | } |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 663 | return NULL; |
| 664 | } |
| 665 | |
| 666 | found_pool: |
| 667 | if (!list_empty(&pool->sp_all_threads)) { |
| 668 | struct svc_rqst *rqstp; |
| 669 | |
| 670 | /* |
| 671 | * Remove from the pool->sp_all_threads list |
| 672 | * so we don't try to kill it again. |
| 673 | */ |
| 674 | rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all); |
| 675 | list_del_init(&rqstp->rq_all); |
| 676 | task = rqstp->rq_task; |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 677 | } |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 678 | spin_unlock_bh(&pool->sp_lock); |
| 679 | |
| 680 | return task; |
| 681 | } |
| 682 | |
| 683 | /* |
| 684 | * Create or destroy enough new threads to make the number |
| 685 | * of threads the given number. If `pool' is non-NULL, applies |
| 686 | * only to threads in that pool, otherwise round-robins between |
| 687 | * all pools. Must be called with a svc_get() reference and |
| 688 | * the BKL held. |
| 689 | * |
| 690 | * Destroying threads relies on the service threads filling in |
| 691 | * rqstp->rq_task, which only the nfs ones do. Assumes the serv |
| 692 | * has been created using svc_create_pooled(). |
| 693 | * |
| 694 | * Based on code that used to be in nfsd_svc() but tweaked |
| 695 | * to be pool-aware. |
| 696 | */ |
| 697 | int |
| 698 | svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) |
| 699 | { |
| 700 | struct task_struct *victim; |
| 701 | int error = 0; |
| 702 | unsigned int state = serv->sv_nrthreads-1; |
| 703 | |
| 704 | if (pool == NULL) { |
| 705 | /* The -1 assumes caller has done a svc_get() */ |
| 706 | nrservs -= (serv->sv_nrthreads-1); |
| 707 | } else { |
| 708 | spin_lock_bh(&pool->sp_lock); |
| 709 | nrservs -= pool->sp_nrthreads; |
| 710 | spin_unlock_bh(&pool->sp_lock); |
| 711 | } |
| 712 | |
| 713 | /* create new threads */ |
| 714 | while (nrservs > 0) { |
| 715 | nrservs--; |
| 716 | __module_get(serv->sv_module); |
| 717 | error = __svc_create_thread(serv->sv_function, serv, |
| 718 | choose_pool(serv, pool, &state)); |
| 719 | if (error < 0) { |
| 720 | module_put(serv->sv_module); |
| 721 | break; |
| 722 | } |
| 723 | } |
| 724 | /* destroy old threads */ |
| 725 | while (nrservs < 0 && |
| 726 | (victim = choose_victim(serv, pool, &state)) != NULL) { |
| 727 | send_sig(serv->sv_kill_signal, victim, 1); |
| 728 | nrservs++; |
| 729 | } |
| 730 | |
| 731 | return error; |
| 732 | } |
Trond Myklebust | d2f7e79 | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 733 | EXPORT_SYMBOL(svc_set_num_threads); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 734 | |
| 735 | /* |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 736 | * 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] | 737 | */ |
| 738 | void |
| 739 | svc_exit_thread(struct svc_rqst *rqstp) |
| 740 | { |
| 741 | struct svc_serv *serv = rqstp->rq_server; |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 742 | struct svc_pool *pool = rqstp->rq_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
| 744 | svc_release_buffer(rqstp); |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 745 | kfree(rqstp->rq_resp); |
| 746 | kfree(rqstp->rq_argp); |
| 747 | kfree(rqstp->rq_auth_data); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 748 | |
| 749 | spin_lock_bh(&pool->sp_lock); |
| 750 | pool->sp_nrthreads--; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 751 | list_del(&rqstp->rq_all); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 752 | spin_unlock_bh(&pool->sp_lock); |
| 753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | kfree(rqstp); |
| 755 | |
| 756 | /* Release the server */ |
| 757 | if (serv) |
| 758 | svc_destroy(serv); |
| 759 | } |
Trond Myklebust | d2f7e79 | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 760 | EXPORT_SYMBOL(svc_exit_thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | |
| 762 | /* |
| 763 | * Register an RPC service with the local portmapper. |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 764 | * To unregister a service, call this routine with |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | * proto and port == 0. |
| 766 | */ |
| 767 | int |
| 768 | svc_register(struct svc_serv *serv, int proto, unsigned short port) |
| 769 | { |
| 770 | struct svc_program *progp; |
| 771 | unsigned long flags; |
Chuck Lever | ea339d4 | 2007-10-26 13:32:56 -0400 | [diff] [blame] | 772 | unsigned int i; |
| 773 | int error = 0, dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | if (!port) |
| 776 | clear_thread_flag(TIF_SIGPENDING); |
| 777 | |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 778 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { |
| 779 | for (i = 0; i < progp->pg_nvers; i++) { |
| 780 | if (progp->pg_vers[i] == NULL) |
| 781 | continue; |
| 782 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 783 | dprintk("svc: svc_register(%s, %s, %d, %d)%s\n", |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 784 | progp->pg_name, |
| 785 | proto == IPPROTO_UDP? "udp" : "tcp", |
| 786 | port, |
| 787 | i, |
| 788 | progp->pg_vers[i]->vs_hidden? |
| 789 | " (but not telling portmap)" : ""); |
| 790 | |
| 791 | if (progp->pg_vers[i]->vs_hidden) |
| 792 | continue; |
| 793 | |
Chuck Lever | 2608001 | 2007-03-29 16:48:16 -0400 | [diff] [blame] | 794 | error = rpcb_register(progp->pg_prog, i, proto, port, &dummy); |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 795 | if (error < 0) |
| 796 | break; |
| 797 | if (port && !dummy) { |
| 798 | error = -EACCES; |
| 799 | break; |
| 800 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | } |
| 802 | } |
| 803 | |
| 804 | if (!port) { |
| 805 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
| 806 | recalc_sigpending(); |
| 807 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
| 808 | } |
| 809 | |
| 810 | return error; |
| 811 | } |
| 812 | |
| 813 | /* |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 814 | * Printk the given error with the address of the client that caused it. |
| 815 | */ |
| 816 | static int |
| 817 | __attribute__ ((format (printf, 2, 3))) |
| 818 | svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) |
| 819 | { |
| 820 | va_list args; |
| 821 | int r; |
| 822 | char buf[RPC_MAX_ADDRBUFLEN]; |
| 823 | |
| 824 | if (!net_ratelimit()) |
| 825 | return 0; |
| 826 | |
| 827 | printk(KERN_WARNING "svc: %s: ", |
| 828 | svc_print_addr(rqstp, buf, sizeof(buf))); |
| 829 | |
| 830 | va_start(args, fmt); |
| 831 | r = vprintk(fmt, args); |
| 832 | va_end(args); |
| 833 | |
| 834 | return r; |
| 835 | } |
| 836 | |
| 837 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | * Process the RPC request. |
| 839 | */ |
| 840 | int |
NeilBrown | 6fb2b47 | 2006-10-02 02:17:50 -0700 | [diff] [blame] | 841 | svc_process(struct svc_rqst *rqstp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | { |
| 843 | struct svc_program *progp; |
| 844 | struct svc_version *versp = NULL; /* compiler food */ |
| 845 | struct svc_procedure *procp = NULL; |
| 846 | struct kvec * argv = &rqstp->rq_arg.head[0]; |
| 847 | struct kvec * resv = &rqstp->rq_res.head[0]; |
NeilBrown | 6fb2b47 | 2006-10-02 02:17:50 -0700 | [diff] [blame] | 848 | struct svc_serv *serv = rqstp->rq_server; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | kxdrproc_t xdr; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 850 | __be32 *statp; |
| 851 | u32 dir, prog, vers, proc; |
| 852 | __be32 auth_stat, rpc_stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | int auth_res; |
J.Bruce Fields | 8f8e05c | 2006-10-04 02:16:08 -0700 | [diff] [blame] | 854 | __be32 *reply_statp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | |
| 856 | rpc_stat = rpc_success; |
| 857 | |
| 858 | if (argv->iov_len < 6*4) |
| 859 | goto err_short_len; |
| 860 | |
| 861 | /* setup response xdr_buf. |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 862 | * Initially it has just one page |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | */ |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 864 | rqstp->rq_resused = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | resv->iov_base = page_address(rqstp->rq_respages[0]); |
| 866 | resv->iov_len = 0; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 867 | rqstp->rq_res.pages = rqstp->rq_respages + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | rqstp->rq_res.len = 0; |
| 869 | rqstp->rq_res.page_base = 0; |
| 870 | rqstp->rq_res.page_len = 0; |
Trond Myklebust | 334ccfd | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 871 | rqstp->rq_res.buflen = PAGE_SIZE; |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 872 | rqstp->rq_res.tail[0].iov_base = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | rqstp->rq_res.tail[0].iov_len = 0; |
J. Bruce Fields | 5c04c46 | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 874 | /* Will be turned off only in gss privacy case: */ |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 875 | rqstp->rq_splice_ok = 1; |
Tom Tucker | e831fe6 | 2007-12-30 21:07:29 -0600 | [diff] [blame] | 876 | |
| 877 | /* Setup reply header */ |
| 878 | rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
| 880 | rqstp->rq_xid = svc_getu32(argv); |
| 881 | svc_putu32(resv, rqstp->rq_xid); |
| 882 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 883 | dir = svc_getnl(argv); |
| 884 | vers = svc_getnl(argv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
| 886 | /* First words of reply: */ |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 887 | svc_putnl(resv, 1); /* REPLY */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | |
| 889 | if (dir != 0) /* direction != CALL */ |
| 890 | goto err_bad_dir; |
| 891 | if (vers != 2) /* RPC version number */ |
| 892 | goto err_bad_rpc; |
| 893 | |
| 894 | /* Save position in case we later decide to reject: */ |
J.Bruce Fields | 8f8e05c | 2006-10-04 02:16:08 -0700 | [diff] [blame] | 895 | reply_statp = resv->iov_base + resv->iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 897 | svc_putnl(resv, 0); /* ACCEPT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 899 | rqstp->rq_prog = prog = svc_getnl(argv); /* program number */ |
| 900 | rqstp->rq_vers = vers = svc_getnl(argv); /* version number */ |
| 901 | rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | |
| 903 | progp = serv->sv_program; |
NeilBrown | 80d188a | 2005-11-07 01:00:27 -0800 | [diff] [blame] | 904 | |
| 905 | for (progp = serv->sv_program; progp; progp = progp->pg_next) |
| 906 | if (prog == progp->pg_prog) |
| 907 | break; |
| 908 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | /* |
| 910 | * Decode auth data, and add verifier to reply buffer. |
| 911 | * We do this before anything else in order to get a decent |
| 912 | * auth verifier. |
| 913 | */ |
| 914 | auth_res = svc_authenticate(rqstp, &auth_stat); |
| 915 | /* Also give the program a chance to reject this call: */ |
NeilBrown | 80d188a | 2005-11-07 01:00:27 -0800 | [diff] [blame] | 916 | if (auth_res == SVC_OK && progp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | auth_stat = rpc_autherr_badcred; |
| 918 | auth_res = progp->pg_authenticate(rqstp); |
| 919 | } |
| 920 | switch (auth_res) { |
| 921 | case SVC_OK: |
| 922 | break; |
| 923 | case SVC_GARBAGE: |
Harshula Jayasuriya | dd35210 | 2008-02-20 10:56:56 +1100 | [diff] [blame] | 924 | goto err_garbage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | case SVC_SYSERR: |
| 926 | rpc_stat = rpc_system_err; |
| 927 | goto err_bad; |
| 928 | case SVC_DENIED: |
| 929 | goto err_bad_auth; |
| 930 | case SVC_DROP: |
| 931 | goto dropit; |
| 932 | case SVC_COMPLETE: |
| 933 | goto sendit; |
| 934 | } |
NeilBrown | 80d188a | 2005-11-07 01:00:27 -0800 | [diff] [blame] | 935 | |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 936 | if (progp == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | goto err_bad_prog; |
| 938 | |
| 939 | if (vers >= progp->pg_nvers || |
| 940 | !(versp = progp->pg_vers[vers])) |
| 941 | goto err_bad_vers; |
| 942 | |
| 943 | procp = versp->vs_proc + proc; |
| 944 | if (proc >= versp->vs_nproc || !procp->pc_func) |
| 945 | goto err_bad_proc; |
| 946 | rqstp->rq_server = serv; |
| 947 | rqstp->rq_procinfo = procp; |
| 948 | |
| 949 | /* Syntactic check complete */ |
| 950 | serv->sv_stats->rpccnt++; |
| 951 | |
| 952 | /* Build the reply header. */ |
| 953 | statp = resv->iov_base +resv->iov_len; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 954 | svc_putnl(resv, RPC_SUCCESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | |
| 956 | /* Bump per-procedure stats counter */ |
| 957 | procp->pc_count++; |
| 958 | |
| 959 | /* Initialize storage for argp and resp */ |
| 960 | memset(rqstp->rq_argp, 0, procp->pc_argsize); |
| 961 | memset(rqstp->rq_resp, 0, procp->pc_ressize); |
| 962 | |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 963 | /* un-reserve some of the out-queue now that we have a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | * better idea of reply size |
| 965 | */ |
| 966 | if (procp->pc_xdrressize) |
Jeff Layton | cd12301 | 2007-05-09 02:34:50 -0700 | [diff] [blame] | 967 | svc_reserve_auth(rqstp, procp->pc_xdrressize<<2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | |
| 969 | /* Call the function that processes the request. */ |
| 970 | if (!versp->vs_dispatch) { |
| 971 | /* Decode arguments */ |
| 972 | xdr = procp->pc_decode; |
| 973 | if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp)) |
| 974 | goto err_garbage; |
| 975 | |
| 976 | *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); |
| 977 | |
| 978 | /* Encode reply */ |
NeilBrown | d343fce | 2006-10-17 00:10:18 -0700 | [diff] [blame] | 979 | if (*statp == rpc_drop_reply) { |
| 980 | if (procp->pc_release) |
| 981 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); |
| 982 | goto dropit; |
| 983 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | if (*statp == rpc_success && (xdr = procp->pc_encode) |
| 985 | && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) { |
| 986 | dprintk("svc: failed to encode reply\n"); |
| 987 | /* serv->sv_stats->rpcsystemerr++; */ |
| 988 | *statp = rpc_system_err; |
| 989 | } |
| 990 | } else { |
| 991 | dprintk("svc: calling dispatcher\n"); |
| 992 | if (!versp->vs_dispatch(rqstp, statp)) { |
| 993 | /* Release reply info */ |
| 994 | if (procp->pc_release) |
| 995 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); |
| 996 | goto dropit; |
| 997 | } |
| 998 | } |
| 999 | |
| 1000 | /* Check RPC status result */ |
| 1001 | if (*statp != rpc_success) |
| 1002 | resv->iov_len = ((void*)statp) - resv->iov_base + 4; |
| 1003 | |
| 1004 | /* Release reply info */ |
| 1005 | if (procp->pc_release) |
| 1006 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); |
| 1007 | |
| 1008 | if (procp->pc_encode == NULL) |
| 1009 | goto dropit; |
| 1010 | |
| 1011 | sendit: |
| 1012 | if (svc_authorise(rqstp)) |
| 1013 | goto dropit; |
| 1014 | return svc_send(rqstp); |
| 1015 | |
| 1016 | dropit: |
| 1017 | svc_authorise(rqstp); /* doesn't hurt to call this twice */ |
| 1018 | dprintk("svc: svc_process dropit\n"); |
| 1019 | svc_drop(rqstp); |
| 1020 | return 0; |
| 1021 | |
| 1022 | err_short_len: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1023 | svc_printk(rqstp, "short len %Zd, dropping request\n", |
| 1024 | argv->iov_len); |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1025 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | goto dropit; /* drop request */ |
| 1027 | |
| 1028 | err_bad_dir: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1029 | svc_printk(rqstp, "bad direction %d, dropping request\n", dir); |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1030 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | serv->sv_stats->rpcbadfmt++; |
| 1032 | goto dropit; /* drop request */ |
| 1033 | |
| 1034 | err_bad_rpc: |
| 1035 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1036 | svc_putnl(resv, 1); /* REJECT */ |
| 1037 | svc_putnl(resv, 0); /* RPC_MISMATCH */ |
| 1038 | svc_putnl(resv, 2); /* Only RPCv2 supported */ |
| 1039 | svc_putnl(resv, 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | goto sendit; |
| 1041 | |
| 1042 | err_bad_auth: |
| 1043 | dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat)); |
| 1044 | serv->sv_stats->rpcbadauth++; |
| 1045 | /* Restore write pointer to location of accept status: */ |
J.Bruce Fields | 8f8e05c | 2006-10-04 02:16:08 -0700 | [diff] [blame] | 1046 | xdr_ressize_check(rqstp, reply_statp); |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1047 | svc_putnl(resv, 1); /* REJECT */ |
| 1048 | svc_putnl(resv, 1); /* AUTH_ERROR */ |
| 1049 | svc_putnl(resv, ntohl(auth_stat)); /* status */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | goto sendit; |
| 1051 | |
| 1052 | err_bad_prog: |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 1053 | dprintk("svc: unknown program %d\n", prog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1055 | svc_putnl(resv, RPC_PROG_UNAVAIL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | goto sendit; |
| 1057 | |
| 1058 | err_bad_vers: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1059 | svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n", |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1060 | vers, prog, progp->pg_name); |
| 1061 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1063 | svc_putnl(resv, RPC_PROG_MISMATCH); |
| 1064 | svc_putnl(resv, progp->pg_lovers); |
| 1065 | svc_putnl(resv, progp->pg_hivers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | goto sendit; |
| 1067 | |
| 1068 | err_bad_proc: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1069 | svc_printk(rqstp, "unknown procedure (%d)\n", proc); |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1070 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1072 | svc_putnl(resv, RPC_PROC_UNAVAIL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | goto sendit; |
| 1074 | |
| 1075 | err_garbage: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1076 | svc_printk(rqstp, "failed to decode args\n"); |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1077 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | rpc_stat = rpc_garbage_args; |
| 1079 | err_bad: |
| 1080 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1081 | svc_putnl(resv, ntohl(rpc_stat)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | goto sendit; |
| 1083 | } |
Trond Myklebust | d2f7e79 | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 1084 | EXPORT_SYMBOL(svc_process); |
Greg Banks | 7adae48 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1085 | |
| 1086 | /* |
| 1087 | * Return (transport-specific) limit on the rpc payload. |
| 1088 | */ |
| 1089 | u32 svc_max_payload(const struct svc_rqst *rqstp) |
| 1090 | { |
Tom Tucker | 4902315 | 2007-12-30 21:07:21 -0600 | [diff] [blame] | 1091 | u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload; |
Greg Banks | 7adae48 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1092 | |
NeilBrown | c6b0a9f | 2006-10-06 00:44:05 -0700 | [diff] [blame] | 1093 | if (rqstp->rq_server->sv_max_payload < max) |
| 1094 | max = rqstp->rq_server->sv_max_payload; |
Greg Banks | 7adae48 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1095 | return max; |
| 1096 | } |
| 1097 | EXPORT_SYMBOL_GPL(svc_max_payload); |