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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 22 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | #include <linux/sunrpc/types.h> |
| 25 | #include <linux/sunrpc/xdr.h> |
| 26 | #include <linux/sunrpc/stats.h> |
| 27 | #include <linux/sunrpc/svcsock.h> |
| 28 | #include <linux/sunrpc/clnt.h> |
Ricardo Labiaga | 4d6bbb6 | 2009-04-01 09:23:07 -0400 | [diff] [blame] | 29 | #include <linux/sunrpc/bc_xprt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
| 31 | #define RPCDBG_FACILITY RPCDBG_SVCDSP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 33 | static void svc_unregister(const struct svc_serv *serv); |
| 34 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 35 | #define svc_serv_is_pooled(serv) ((serv)->sv_function) |
| 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | /* |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 38 | * Mode for mapping cpus to pools. |
| 39 | */ |
| 40 | enum { |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 41 | SVC_POOL_AUTO = -1, /* choose one of the others */ |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 42 | SVC_POOL_GLOBAL, /* no mapping, just a single global pool |
| 43 | * (legacy & UP mode) */ |
| 44 | SVC_POOL_PERCPU, /* one pool per cpu */ |
| 45 | SVC_POOL_PERNODE /* one pool per numa node */ |
| 46 | }; |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 47 | #define SVC_POOL_DEFAULT SVC_POOL_GLOBAL |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 48 | |
| 49 | /* |
| 50 | * Structure for mapping cpus to pools and vice versa. |
| 51 | * Setup once during sunrpc initialisation. |
| 52 | */ |
| 53 | static struct svc_pool_map { |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 54 | int count; /* How many svc_servs use us */ |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 55 | int mode; /* Note: int not enum to avoid |
| 56 | * warnings about "enumeration value |
| 57 | * not handled in switch" */ |
| 58 | unsigned int npools; |
| 59 | unsigned int *pool_to; /* maps pool id to cpu or node */ |
| 60 | unsigned int *to_pool; /* maps cpu or node to pool id */ |
| 61 | } svc_pool_map = { |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 62 | .count = 0, |
| 63 | .mode = SVC_POOL_DEFAULT |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 64 | }; |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 65 | 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] | 66 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 67 | static int |
| 68 | param_set_pool_mode(const char *val, struct kernel_param *kp) |
| 69 | { |
| 70 | int *ip = (int *)kp->arg; |
| 71 | struct svc_pool_map *m = &svc_pool_map; |
| 72 | int err; |
| 73 | |
| 74 | mutex_lock(&svc_pool_map_mutex); |
| 75 | |
| 76 | err = -EBUSY; |
| 77 | if (m->count) |
| 78 | goto out; |
| 79 | |
| 80 | err = 0; |
| 81 | if (!strncmp(val, "auto", 4)) |
| 82 | *ip = SVC_POOL_AUTO; |
| 83 | else if (!strncmp(val, "global", 6)) |
| 84 | *ip = SVC_POOL_GLOBAL; |
| 85 | else if (!strncmp(val, "percpu", 6)) |
| 86 | *ip = SVC_POOL_PERCPU; |
| 87 | else if (!strncmp(val, "pernode", 7)) |
| 88 | *ip = SVC_POOL_PERNODE; |
| 89 | else |
| 90 | err = -EINVAL; |
| 91 | |
| 92 | out: |
| 93 | mutex_unlock(&svc_pool_map_mutex); |
| 94 | return err; |
| 95 | } |
| 96 | |
| 97 | static int |
| 98 | param_get_pool_mode(char *buf, struct kernel_param *kp) |
| 99 | { |
| 100 | int *ip = (int *)kp->arg; |
| 101 | |
| 102 | switch (*ip) |
| 103 | { |
| 104 | case SVC_POOL_AUTO: |
| 105 | return strlcpy(buf, "auto", 20); |
| 106 | case SVC_POOL_GLOBAL: |
| 107 | return strlcpy(buf, "global", 20); |
| 108 | case SVC_POOL_PERCPU: |
| 109 | return strlcpy(buf, "percpu", 20); |
| 110 | case SVC_POOL_PERNODE: |
| 111 | return strlcpy(buf, "pernode", 20); |
| 112 | default: |
| 113 | return sprintf(buf, "%d", *ip); |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode, |
| 118 | &svc_pool_map.mode, 0644); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 119 | |
| 120 | /* |
| 121 | * Detect best pool mapping mode heuristically, |
| 122 | * according to the machine's topology. |
| 123 | */ |
| 124 | static int |
| 125 | svc_pool_map_choose_mode(void) |
| 126 | { |
| 127 | unsigned int node; |
| 128 | |
Christoph Lameter | 62bc62a | 2009-06-16 15:32:15 -0700 | [diff] [blame] | 129 | if (nr_online_nodes > 1) { |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 130 | /* |
| 131 | * Actually have multiple NUMA nodes, |
| 132 | * so split pools on NUMA node boundaries |
| 133 | */ |
| 134 | return SVC_POOL_PERNODE; |
| 135 | } |
| 136 | |
H Hartley Sweeten | 72c3368 | 2010-03-05 13:42:43 -0800 | [diff] [blame] | 137 | node = first_online_node; |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 138 | if (nr_cpus_node(node) > 2) { |
| 139 | /* |
| 140 | * Non-trivial SMP, or CONFIG_NUMA on |
| 141 | * non-NUMA hardware, e.g. with a generic |
| 142 | * x86_64 kernel on Xeons. In this case we |
| 143 | * want to divide the pools on cpu boundaries. |
| 144 | */ |
| 145 | return SVC_POOL_PERCPU; |
| 146 | } |
| 147 | |
| 148 | /* default: one global pool */ |
| 149 | return SVC_POOL_GLOBAL; |
| 150 | } |
| 151 | |
| 152 | /* |
| 153 | * Allocate the to_pool[] and pool_to[] arrays. |
| 154 | * Returns 0 on success or an errno. |
| 155 | */ |
| 156 | static int |
| 157 | svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools) |
| 158 | { |
| 159 | m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL); |
| 160 | if (!m->to_pool) |
| 161 | goto fail; |
| 162 | m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL); |
| 163 | if (!m->pool_to) |
| 164 | goto fail_free; |
| 165 | |
| 166 | return 0; |
| 167 | |
| 168 | fail_free: |
| 169 | kfree(m->to_pool); |
| 170 | fail: |
| 171 | return -ENOMEM; |
| 172 | } |
| 173 | |
| 174 | /* |
| 175 | * Initialise the pool map for SVC_POOL_PERCPU mode. |
| 176 | * Returns number of pools or <0 on error. |
| 177 | */ |
| 178 | static int |
| 179 | svc_pool_map_init_percpu(struct svc_pool_map *m) |
| 180 | { |
Christoph Lameter | 53b8a31 | 2007-02-20 13:57:51 -0800 | [diff] [blame] | 181 | unsigned int maxpools = nr_cpu_ids; |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 182 | unsigned int pidx = 0; |
| 183 | unsigned int cpu; |
| 184 | int err; |
| 185 | |
| 186 | err = svc_pool_map_alloc_arrays(m, maxpools); |
| 187 | if (err) |
| 188 | return err; |
| 189 | |
| 190 | for_each_online_cpu(cpu) { |
| 191 | BUG_ON(pidx > maxpools); |
| 192 | m->to_pool[cpu] = pidx; |
| 193 | m->pool_to[pidx] = cpu; |
| 194 | pidx++; |
| 195 | } |
| 196 | /* cpus brought online later all get mapped to pool0, sorry */ |
| 197 | |
| 198 | return pidx; |
| 199 | }; |
| 200 | |
| 201 | |
| 202 | /* |
| 203 | * Initialise the pool map for SVC_POOL_PERNODE mode. |
| 204 | * Returns number of pools or <0 on error. |
| 205 | */ |
| 206 | static int |
| 207 | svc_pool_map_init_pernode(struct svc_pool_map *m) |
| 208 | { |
Christoph Lameter | 74c7aa8 | 2007-02-20 13:57:51 -0800 | [diff] [blame] | 209 | unsigned int maxpools = nr_node_ids; |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 210 | unsigned int pidx = 0; |
| 211 | unsigned int node; |
| 212 | int err; |
| 213 | |
| 214 | err = svc_pool_map_alloc_arrays(m, maxpools); |
| 215 | if (err) |
| 216 | return err; |
| 217 | |
| 218 | for_each_node_with_cpus(node) { |
| 219 | /* some architectures (e.g. SN2) have cpuless nodes */ |
| 220 | BUG_ON(pidx > maxpools); |
| 221 | m->to_pool[node] = pidx; |
| 222 | m->pool_to[pidx] = node; |
| 223 | pidx++; |
| 224 | } |
| 225 | /* nodes brought online later all get mapped to pool0, sorry */ |
| 226 | |
| 227 | return pidx; |
| 228 | } |
| 229 | |
| 230 | |
| 231 | /* |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 232 | * Add a reference to the global map of cpus to pools (and |
| 233 | * vice versa). Initialise the map if we're the first user. |
| 234 | * Returns the number of pools. |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 235 | */ |
| 236 | static unsigned int |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 237 | svc_pool_map_get(void) |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 238 | { |
| 239 | struct svc_pool_map *m = &svc_pool_map; |
| 240 | int npools = -1; |
| 241 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 242 | mutex_lock(&svc_pool_map_mutex); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 243 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 244 | if (m->count++) { |
| 245 | mutex_unlock(&svc_pool_map_mutex); |
| 246 | return m->npools; |
| 247 | } |
| 248 | |
| 249 | if (m->mode == SVC_POOL_AUTO) |
| 250 | m->mode = svc_pool_map_choose_mode(); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 251 | |
| 252 | switch (m->mode) { |
| 253 | case SVC_POOL_PERCPU: |
| 254 | npools = svc_pool_map_init_percpu(m); |
| 255 | break; |
| 256 | case SVC_POOL_PERNODE: |
| 257 | npools = svc_pool_map_init_pernode(m); |
| 258 | break; |
| 259 | } |
| 260 | |
| 261 | if (npools < 0) { |
| 262 | /* default, or memory allocation failure */ |
| 263 | npools = 1; |
| 264 | m->mode = SVC_POOL_GLOBAL; |
| 265 | } |
| 266 | m->npools = npools; |
| 267 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 268 | mutex_unlock(&svc_pool_map_mutex); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 269 | return m->npools; |
| 270 | } |
| 271 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 272 | |
| 273 | /* |
| 274 | * Drop a reference to the global map of cpus to pools. |
| 275 | * When the last reference is dropped, the map data is |
| 276 | * freed; this allows the sysadmin to change the pool |
| 277 | * mode using the pool_mode module option without |
| 278 | * rebooting or re-loading sunrpc.ko. |
| 279 | */ |
| 280 | static void |
| 281 | svc_pool_map_put(void) |
| 282 | { |
| 283 | struct svc_pool_map *m = &svc_pool_map; |
| 284 | |
| 285 | mutex_lock(&svc_pool_map_mutex); |
| 286 | |
| 287 | if (!--m->count) { |
| 288 | m->mode = SVC_POOL_DEFAULT; |
| 289 | kfree(m->to_pool); |
| 290 | kfree(m->pool_to); |
| 291 | m->npools = 0; |
| 292 | } |
| 293 | |
| 294 | mutex_unlock(&svc_pool_map_mutex); |
| 295 | } |
| 296 | |
| 297 | |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 298 | /* |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 299 | * Set the given thread's cpus_allowed mask so that it |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 300 | * will only run on cpus in the given pool. |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 301 | */ |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 302 | static inline void |
| 303 | svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx) |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 304 | { |
| 305 | struct svc_pool_map *m = &svc_pool_map; |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 306 | unsigned int node = m->pool_to[pidx]; |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 307 | |
| 308 | /* |
| 309 | * The caller checks for sv_nrpools > 1, which |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 310 | * implies that we've been initialized. |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 311 | */ |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 312 | BUG_ON(m->count == 0); |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 313 | |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 314 | switch (m->mode) { |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 315 | case SVC_POOL_PERCPU: |
Mike Travis | c5f59f0 | 2008-04-04 18:11:10 -0700 | [diff] [blame] | 316 | { |
Rusty Russell | aa85ea5 | 2009-03-30 22:05:15 -0600 | [diff] [blame] | 317 | set_cpus_allowed_ptr(task, cpumask_of(node)); |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 318 | break; |
Mike Travis | c5f59f0 | 2008-04-04 18:11:10 -0700 | [diff] [blame] | 319 | } |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 320 | case SVC_POOL_PERNODE: |
Mike Travis | c5f59f0 | 2008-04-04 18:11:10 -0700 | [diff] [blame] | 321 | { |
Rusty Russell | a70f730 | 2009-03-13 14:49:46 +1030 | [diff] [blame] | 322 | set_cpus_allowed_ptr(task, cpumask_of_node(node)); |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 323 | break; |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 324 | } |
Mike Travis | c5f59f0 | 2008-04-04 18:11:10 -0700 | [diff] [blame] | 325 | } |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 326 | } |
| 327 | |
| 328 | /* |
| 329 | * Use the mapping mode to choose a pool for a given CPU. |
| 330 | * Used when enqueueing an incoming RPC. Always returns |
| 331 | * a non-NULL pool pointer. |
| 332 | */ |
| 333 | struct svc_pool * |
| 334 | svc_pool_for_cpu(struct svc_serv *serv, int cpu) |
| 335 | { |
| 336 | struct svc_pool_map *m = &svc_pool_map; |
| 337 | unsigned int pidx = 0; |
| 338 | |
| 339 | /* |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 340 | * An uninitialised map happens in a pure client when |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 341 | * lockd is brought up, so silently treat it the |
| 342 | * same as SVC_POOL_GLOBAL. |
| 343 | */ |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 344 | if (svc_serv_is_pooled(serv)) { |
| 345 | switch (m->mode) { |
| 346 | case SVC_POOL_PERCPU: |
| 347 | pidx = m->to_pool[cpu]; |
| 348 | break; |
| 349 | case SVC_POOL_PERNODE: |
| 350 | pidx = m->to_pool[cpu_to_node(cpu)]; |
| 351 | break; |
| 352 | } |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 353 | } |
| 354 | return &serv->sv_pools[pidx % serv->sv_nrpools]; |
| 355 | } |
| 356 | |
Stanislav Kinsbursky | d990856 | 2011-10-25 14:16:58 +0300 | [diff] [blame] | 357 | static int svc_rpcb_setup(struct svc_serv *serv) |
| 358 | { |
| 359 | int err; |
| 360 | |
| 361 | err = rpcb_create_local(); |
| 362 | if (err) |
| 363 | return err; |
| 364 | |
| 365 | /* Remove any stale portmap registrations */ |
| 366 | svc_unregister(serv); |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | static void svc_rpcb_cleanup(struct svc_serv *serv) |
| 371 | { |
| 372 | svc_unregister(serv); |
| 373 | rpcb_put_local(); |
| 374 | } |
| 375 | |
| 376 | static int svc_uses_rpcbind(struct svc_serv *serv) |
| 377 | { |
| 378 | struct svc_program *progp; |
| 379 | unsigned int i; |
| 380 | |
| 381 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { |
| 382 | for (i = 0; i < progp->pg_nvers; i++) { |
| 383 | if (progp->pg_vers[i] == NULL) |
| 384 | continue; |
| 385 | if (progp->pg_vers[i]->vs_hidden == 0) |
| 386 | return 1; |
| 387 | } |
| 388 | } |
| 389 | |
| 390 | return 0; |
| 391 | } |
Greg Banks | bfd2416 | 2006-10-02 02:18:01 -0700 | [diff] [blame] | 392 | |
| 393 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | * Create an RPC service |
| 395 | */ |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 396 | static struct svc_serv * |
| 397 | __svc_create(struct svc_program *prog, unsigned int bufsize, int npools, |
Chuck Lever | 49a9072 | 2009-03-18 20:46:29 -0400 | [diff] [blame] | 398 | void (*shutdown)(struct svc_serv *serv)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | { |
| 400 | struct svc_serv *serv; |
Chuck Lever | ea339d4 | 2007-10-26 13:32:56 -0400 | [diff] [blame] | 401 | unsigned int vers; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | unsigned int xdrsize; |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 403 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 405 | if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | return NULL; |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 407 | serv->sv_name = prog->pg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | serv->sv_program = prog; |
| 409 | serv->sv_nrthreads = 1; |
| 410 | serv->sv_stats = prog->pg_stats; |
NeilBrown | c6b0a9f | 2006-10-06 00:44:05 -0700 | [diff] [blame] | 411 | if (bufsize > RPCSVC_MAXPAYLOAD) |
| 412 | bufsize = RPCSVC_MAXPAYLOAD; |
| 413 | serv->sv_max_payload = bufsize? bufsize : 4096; |
| 414 | serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE); |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 415 | serv->sv_shutdown = shutdown; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | xdrsize = 0; |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 417 | while (prog) { |
| 418 | prog->pg_lovers = prog->pg_nvers-1; |
| 419 | for (vers=0; vers<prog->pg_nvers ; vers++) |
| 420 | if (prog->pg_vers[vers]) { |
| 421 | prog->pg_hivers = vers; |
| 422 | if (prog->pg_lovers > vers) |
| 423 | prog->pg_lovers = vers; |
| 424 | if (prog->pg_vers[vers]->vs_xdrsize > xdrsize) |
| 425 | xdrsize = prog->pg_vers[vers]->vs_xdrsize; |
| 426 | } |
| 427 | prog = prog->pg_next; |
| 428 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | serv->sv_xdrsize = xdrsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | INIT_LIST_HEAD(&serv->sv_tempsocks); |
| 431 | INIT_LIST_HEAD(&serv->sv_permsocks); |
Greg Banks | 36bdfc8 | 2006-10-02 02:17:54 -0700 | [diff] [blame] | 432 | init_timer(&serv->sv_temptimer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | spin_lock_init(&serv->sv_lock); |
| 434 | |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 435 | serv->sv_nrpools = npools; |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 436 | serv->sv_pools = |
Robert P. J. Day | cd86128 | 2006-12-13 00:34:52 -0800 | [diff] [blame] | 437 | kcalloc(serv->sv_nrpools, sizeof(struct svc_pool), |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 438 | GFP_KERNEL); |
| 439 | if (!serv->sv_pools) { |
| 440 | kfree(serv); |
| 441 | return NULL; |
| 442 | } |
| 443 | |
| 444 | for (i = 0; i < serv->sv_nrpools; i++) { |
| 445 | struct svc_pool *pool = &serv->sv_pools[i]; |
| 446 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 447 | dprintk("svc: initialising pool %u for %s\n", |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 448 | i, serv->sv_name); |
| 449 | |
| 450 | pool->sp_id = i; |
| 451 | INIT_LIST_HEAD(&pool->sp_threads); |
| 452 | INIT_LIST_HEAD(&pool->sp_sockets); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 453 | INIT_LIST_HEAD(&pool->sp_all_threads); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 454 | spin_lock_init(&pool->sp_lock); |
| 455 | } |
| 456 | |
Stanislav Kinsbursky | e40f5e2 | 2011-10-25 14:17:08 +0300 | [diff] [blame^] | 457 | if (svc_uses_rpcbind(serv)) { |
| 458 | if (svc_rpcb_setup(serv) < 0) { |
| 459 | kfree(serv->sv_pools); |
| 460 | kfree(serv); |
| 461 | return NULL; |
| 462 | } |
| 463 | if (!serv->sv_shutdown) |
| 464 | serv->sv_shutdown = svc_rpcb_cleanup; |
| 465 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | return serv; |
| 468 | } |
| 469 | |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 470 | struct svc_serv * |
| 471 | svc_create(struct svc_program *prog, unsigned int bufsize, |
Chuck Lever | 49a9072 | 2009-03-18 20:46:29 -0400 | [diff] [blame] | 472 | void (*shutdown)(struct svc_serv *serv)) |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 473 | { |
Chuck Lever | 49a9072 | 2009-03-18 20:46:29 -0400 | [diff] [blame] | 474 | return __svc_create(prog, bufsize, /*npools*/1, shutdown); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 475 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 476 | EXPORT_SYMBOL_GPL(svc_create); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 477 | |
| 478 | struct svc_serv * |
| 479 | svc_create_pooled(struct svc_program *prog, unsigned int bufsize, |
Chuck Lever | 49a9072 | 2009-03-18 20:46:29 -0400 | [diff] [blame] | 480 | void (*shutdown)(struct svc_serv *serv), |
Jeff Layton | a75c5d0 | 2008-06-10 08:40:39 -0400 | [diff] [blame] | 481 | svc_thread_fn func, struct module *mod) |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 482 | { |
| 483 | struct svc_serv *serv; |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 484 | unsigned int npools = svc_pool_map_get(); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 485 | |
Chuck Lever | 49a9072 | 2009-03-18 20:46:29 -0400 | [diff] [blame] | 486 | serv = __svc_create(prog, bufsize, npools, shutdown); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 487 | |
| 488 | if (serv != NULL) { |
| 489 | serv->sv_function = func; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 490 | serv->sv_module = mod; |
| 491 | } |
| 492 | |
| 493 | return serv; |
| 494 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 495 | EXPORT_SYMBOL_GPL(svc_create_pooled); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 496 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | /* |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 498 | * Destroy an RPC service. Should be called with appropriate locking to |
| 499 | * protect the sv_nrthreads, sv_permsocks and sv_tempsocks. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | */ |
| 501 | void |
| 502 | svc_destroy(struct svc_serv *serv) |
| 503 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 504 | dprintk("svc: svc_destroy(%s, %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | serv->sv_program->pg_name, |
| 506 | serv->sv_nrthreads); |
| 507 | |
| 508 | if (serv->sv_nrthreads) { |
| 509 | if (--(serv->sv_nrthreads) != 0) { |
| 510 | svc_sock_update_bufs(serv); |
| 511 | return; |
| 512 | } |
| 513 | } else |
| 514 | printk("svc_destroy: no threads for serv=%p!\n", serv); |
| 515 | |
Greg Banks | 36bdfc8 | 2006-10-02 02:17:54 -0700 | [diff] [blame] | 516 | del_timer_sync(&serv->sv_temptimer); |
| 517 | |
Tom Tucker | 7a18208 | 2007-12-30 21:07:53 -0600 | [diff] [blame] | 518 | svc_close_all(&serv->sv_tempsocks); |
NeilBrown | cda1fd4 | 2007-03-06 01:42:22 -0800 | [diff] [blame] | 519 | |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 520 | if (serv->sv_shutdown) |
| 521 | serv->sv_shutdown(serv); |
| 522 | |
Tom Tucker | 7a18208 | 2007-12-30 21:07:53 -0600 | [diff] [blame] | 523 | svc_close_all(&serv->sv_permsocks); |
NeilBrown | cda1fd4 | 2007-03-06 01:42:22 -0800 | [diff] [blame] | 524 | |
| 525 | BUG_ON(!list_empty(&serv->sv_permsocks)); |
| 526 | BUG_ON(!list_empty(&serv->sv_tempsocks)); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 527 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | cache_clean_deferred(serv); |
| 529 | |
Greg Banks | 42a7fc4 | 2007-03-06 01:42:23 -0800 | [diff] [blame] | 530 | if (svc_serv_is_pooled(serv)) |
| 531 | svc_pool_map_put(); |
| 532 | |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 533 | svc_unregister(serv); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 534 | kfree(serv->sv_pools); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | kfree(serv); |
| 536 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 537 | EXPORT_SYMBOL_GPL(svc_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | |
| 539 | /* |
| 540 | * Allocate an RPC server's buffer space. |
| 541 | * We allocate pages and place them in rq_argpages. |
| 542 | */ |
| 543 | static int |
| 544 | svc_init_buffer(struct svc_rqst *rqstp, unsigned int size) |
| 545 | { |
Chuck Lever | 0dc220f | 2008-04-14 12:27:52 -0400 | [diff] [blame] | 546 | unsigned int pages, arghi; |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 547 | |
Andy Adamson | ba17686 | 2010-01-26 21:24:04 -0500 | [diff] [blame] | 548 | /* bc_xprt uses fore channel allocated buffers */ |
| 549 | if (svc_is_backchannel(rqstp)) |
| 550 | return 1; |
| 551 | |
NeilBrown | c6b0a9f | 2006-10-06 00:44:05 -0700 | [diff] [blame] | 552 | pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply. |
| 553 | * We assume one is at most one page |
| 554 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | arghi = 0; |
Kris Katterjohn | 09a6266 | 2006-01-08 22:24:28 -0800 | [diff] [blame] | 556 | BUG_ON(pages > RPCSVC_MAXPAGES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | while (pages) { |
| 558 | struct page *p = alloc_page(GFP_KERNEL); |
| 559 | if (!p) |
| 560 | break; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 561 | rqstp->rq_pages[arghi++] = p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | pages--; |
| 563 | } |
Chuck Lever | 0dc220f | 2008-04-14 12:27:52 -0400 | [diff] [blame] | 564 | return pages == 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | } |
| 566 | |
| 567 | /* |
| 568 | * Release an RPC server buffer |
| 569 | */ |
| 570 | static void |
| 571 | svc_release_buffer(struct svc_rqst *rqstp) |
| 572 | { |
Chuck Lever | 50c8bb1 | 2008-04-14 12:27:45 -0400 | [diff] [blame] | 573 | unsigned int i; |
| 574 | |
| 575 | for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++) |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 576 | if (rqstp->rq_pages[i]) |
| 577 | put_page(rqstp->rq_pages[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | } |
| 579 | |
Jeff Layton | 0113ab3 | 2008-01-29 10:30:54 -0500 | [diff] [blame] | 580 | struct svc_rqst * |
| 581 | svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool) |
| 582 | { |
| 583 | struct svc_rqst *rqstp; |
| 584 | |
| 585 | rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL); |
| 586 | if (!rqstp) |
| 587 | goto out_enomem; |
| 588 | |
| 589 | init_waitqueue_head(&rqstp->rq_wait); |
| 590 | |
| 591 | serv->sv_nrthreads++; |
| 592 | spin_lock_bh(&pool->sp_lock); |
| 593 | pool->sp_nrthreads++; |
| 594 | list_add(&rqstp->rq_all, &pool->sp_all_threads); |
| 595 | spin_unlock_bh(&pool->sp_lock); |
| 596 | rqstp->rq_server = serv; |
| 597 | rqstp->rq_pool = pool; |
| 598 | |
| 599 | rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL); |
| 600 | if (!rqstp->rq_argp) |
| 601 | goto out_thread; |
| 602 | |
| 603 | rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL); |
| 604 | if (!rqstp->rq_resp) |
| 605 | goto out_thread; |
| 606 | |
| 607 | if (!svc_init_buffer(rqstp, serv->sv_max_mesg)) |
| 608 | goto out_thread; |
| 609 | |
| 610 | return rqstp; |
| 611 | out_thread: |
| 612 | svc_exit_thread(rqstp); |
| 613 | out_enomem: |
| 614 | return ERR_PTR(-ENOMEM); |
| 615 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 616 | EXPORT_SYMBOL_GPL(svc_prepare_thread); |
Jeff Layton | 0113ab3 | 2008-01-29 10:30:54 -0500 | [diff] [blame] | 617 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | /* |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 619 | * Choose a pool in which to create a new thread, for svc_set_num_threads |
| 620 | */ |
| 621 | static inline struct svc_pool * |
| 622 | choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) |
| 623 | { |
| 624 | if (pool != NULL) |
| 625 | return pool; |
| 626 | |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 627 | return &serv->sv_pools[(*state)++ % serv->sv_nrpools]; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 628 | } |
| 629 | |
| 630 | /* |
| 631 | * Choose a thread to kill, for svc_set_num_threads |
| 632 | */ |
| 633 | static inline struct task_struct * |
| 634 | choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) |
| 635 | { |
| 636 | unsigned int i; |
| 637 | struct task_struct *task = NULL; |
| 638 | |
| 639 | if (pool != NULL) { |
| 640 | spin_lock_bh(&pool->sp_lock); |
| 641 | } else { |
| 642 | /* choose a pool in round-robin fashion */ |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 643 | for (i = 0; i < serv->sv_nrpools; i++) { |
| 644 | pool = &serv->sv_pools[--(*state) % serv->sv_nrpools]; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 645 | spin_lock_bh(&pool->sp_lock); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 646 | if (!list_empty(&pool->sp_all_threads)) |
| 647 | goto found_pool; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 648 | spin_unlock_bh(&pool->sp_lock); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 649 | } |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 650 | return NULL; |
| 651 | } |
| 652 | |
| 653 | found_pool: |
| 654 | if (!list_empty(&pool->sp_all_threads)) { |
| 655 | struct svc_rqst *rqstp; |
| 656 | |
| 657 | /* |
| 658 | * Remove from the pool->sp_all_threads list |
| 659 | * so we don't try to kill it again. |
| 660 | */ |
| 661 | rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all); |
| 662 | list_del_init(&rqstp->rq_all); |
| 663 | task = rqstp->rq_task; |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 664 | } |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 665 | spin_unlock_bh(&pool->sp_lock); |
| 666 | |
| 667 | return task; |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * Create or destroy enough new threads to make the number |
| 672 | * of threads the given number. If `pool' is non-NULL, applies |
| 673 | * only to threads in that pool, otherwise round-robins between |
| 674 | * all pools. Must be called with a svc_get() reference and |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 675 | * the BKL or another lock to protect access to svc_serv fields. |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 676 | * |
| 677 | * Destroying threads relies on the service threads filling in |
| 678 | * rqstp->rq_task, which only the nfs ones do. Assumes the serv |
| 679 | * has been created using svc_create_pooled(). |
| 680 | * |
| 681 | * Based on code that used to be in nfsd_svc() but tweaked |
| 682 | * to be pool-aware. |
| 683 | */ |
| 684 | int |
| 685 | svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) |
| 686 | { |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 687 | struct svc_rqst *rqstp; |
| 688 | struct task_struct *task; |
| 689 | struct svc_pool *chosen_pool; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 690 | int error = 0; |
| 691 | unsigned int state = serv->sv_nrthreads-1; |
| 692 | |
| 693 | if (pool == NULL) { |
| 694 | /* The -1 assumes caller has done a svc_get() */ |
| 695 | nrservs -= (serv->sv_nrthreads-1); |
| 696 | } else { |
| 697 | spin_lock_bh(&pool->sp_lock); |
| 698 | nrservs -= pool->sp_nrthreads; |
| 699 | spin_unlock_bh(&pool->sp_lock); |
| 700 | } |
| 701 | |
| 702 | /* create new threads */ |
| 703 | while (nrservs > 0) { |
| 704 | nrservs--; |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 705 | chosen_pool = choose_pool(serv, pool, &state); |
| 706 | |
| 707 | rqstp = svc_prepare_thread(serv, chosen_pool); |
| 708 | if (IS_ERR(rqstp)) { |
| 709 | error = PTR_ERR(rqstp); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 710 | break; |
| 711 | } |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 712 | |
| 713 | __module_get(serv->sv_module); |
| 714 | task = kthread_create(serv->sv_function, rqstp, serv->sv_name); |
| 715 | if (IS_ERR(task)) { |
| 716 | error = PTR_ERR(task); |
| 717 | module_put(serv->sv_module); |
| 718 | svc_exit_thread(rqstp); |
| 719 | break; |
| 720 | } |
| 721 | |
| 722 | rqstp->rq_task = task; |
| 723 | if (serv->sv_nrpools > 1) |
| 724 | svc_pool_map_set_cpumask(task, chosen_pool->sp_id); |
| 725 | |
| 726 | svc_sock_update_bufs(serv); |
| 727 | wake_up_process(task); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 728 | } |
| 729 | /* destroy old threads */ |
| 730 | while (nrservs < 0 && |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 731 | (task = choose_victim(serv, pool, &state)) != NULL) { |
Jeff Layton | a75c5d0 | 2008-06-10 08:40:39 -0400 | [diff] [blame] | 732 | send_sig(SIGINT, task, 1); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 733 | nrservs++; |
| 734 | } |
| 735 | |
| 736 | return error; |
| 737 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 738 | EXPORT_SYMBOL_GPL(svc_set_num_threads); |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 739 | |
| 740 | /* |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 741 | * Called from a server thread as it's exiting. Caller must hold the BKL or |
| 742 | * the "service mutex", whichever is appropriate for the service. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | */ |
| 744 | void |
| 745 | svc_exit_thread(struct svc_rqst *rqstp) |
| 746 | { |
| 747 | struct svc_serv *serv = rqstp->rq_server; |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 748 | struct svc_pool *pool = rqstp->rq_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
| 750 | svc_release_buffer(rqstp); |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 751 | kfree(rqstp->rq_resp); |
| 752 | kfree(rqstp->rq_argp); |
| 753 | kfree(rqstp->rq_auth_data); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 754 | |
| 755 | spin_lock_bh(&pool->sp_lock); |
| 756 | pool->sp_nrthreads--; |
Greg Banks | a745544 | 2006-10-02 02:17:59 -0700 | [diff] [blame] | 757 | list_del(&rqstp->rq_all); |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 758 | spin_unlock_bh(&pool->sp_lock); |
| 759 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | kfree(rqstp); |
| 761 | |
| 762 | /* Release the server */ |
| 763 | if (serv) |
| 764 | svc_destroy(serv); |
| 765 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 766 | EXPORT_SYMBOL_GPL(svc_exit_thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | |
| 768 | /* |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 769 | * Register an "inet" protocol family netid with the local |
| 770 | * rpcbind daemon via an rpcbind v4 SET request. |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 771 | * |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 772 | * No netconfig infrastructure is available in the kernel, so |
| 773 | * we map IP_ protocol numbers to netids by hand. |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 774 | * |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 775 | * Returns zero on success; a negative errno value is returned |
| 776 | * if any error occurs. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | */ |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 778 | static int __svc_rpcb_register4(const u32 program, const u32 version, |
| 779 | const unsigned short protocol, |
| 780 | const unsigned short port) |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 781 | { |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 782 | const struct sockaddr_in sin = { |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 783 | .sin_family = AF_INET, |
| 784 | .sin_addr.s_addr = htonl(INADDR_ANY), |
| 785 | .sin_port = htons(port), |
| 786 | }; |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 787 | const char *netid; |
| 788 | int error; |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 789 | |
| 790 | switch (protocol) { |
| 791 | case IPPROTO_UDP: |
| 792 | netid = RPCBIND_NETID_UDP; |
| 793 | break; |
| 794 | case IPPROTO_TCP: |
| 795 | netid = RPCBIND_NETID_TCP; |
| 796 | break; |
| 797 | default: |
Chuck Lever | ba5c35e | 2009-03-18 20:46:59 -0400 | [diff] [blame] | 798 | return -ENOPROTOOPT; |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 799 | } |
| 800 | |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 801 | error = rpcb_v4_register(program, version, |
| 802 | (const struct sockaddr *)&sin, netid); |
| 803 | |
| 804 | /* |
| 805 | * User space didn't support rpcbind v4, so retry this |
| 806 | * registration request with the legacy rpcbind v2 protocol. |
| 807 | */ |
| 808 | if (error == -EPROTONOSUPPORT) |
| 809 | error = rpcb_register(program, version, protocol, port); |
| 810 | |
| 811 | return error; |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 812 | } |
| 813 | |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 814 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 815 | /* |
| 816 | * Register an "inet6" protocol family netid with the local |
| 817 | * rpcbind daemon via an rpcbind v4 SET request. |
| 818 | * |
| 819 | * No netconfig infrastructure is available in the kernel, so |
| 820 | * we map IP_ protocol numbers to netids by hand. |
| 821 | * |
| 822 | * Returns zero on success; a negative errno value is returned |
| 823 | * if any error occurs. |
| 824 | */ |
| 825 | static int __svc_rpcb_register6(const u32 program, const u32 version, |
| 826 | const unsigned short protocol, |
| 827 | const unsigned short port) |
| 828 | { |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 829 | const struct sockaddr_in6 sin6 = { |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 830 | .sin6_family = AF_INET6, |
| 831 | .sin6_addr = IN6ADDR_ANY_INIT, |
| 832 | .sin6_port = htons(port), |
| 833 | }; |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 834 | const char *netid; |
| 835 | int error; |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 836 | |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 837 | switch (protocol) { |
| 838 | case IPPROTO_UDP: |
| 839 | netid = RPCBIND_NETID_UDP6; |
| 840 | break; |
| 841 | case IPPROTO_TCP: |
| 842 | netid = RPCBIND_NETID_TCP6; |
| 843 | break; |
| 844 | default: |
Chuck Lever | ba5c35e | 2009-03-18 20:46:59 -0400 | [diff] [blame] | 845 | return -ENOPROTOOPT; |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 846 | } |
| 847 | |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 848 | error = rpcb_v4_register(program, version, |
| 849 | (const struct sockaddr *)&sin6, netid); |
| 850 | |
| 851 | /* |
| 852 | * User space didn't support rpcbind version 4, so we won't |
| 853 | * use a PF_INET6 listener. |
| 854 | */ |
| 855 | if (error == -EPROTONOSUPPORT) |
| 856 | error = -EAFNOSUPPORT; |
| 857 | |
| 858 | return error; |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 859 | } |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 860 | #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 861 | |
| 862 | /* |
| 863 | * Register a kernel RPC service via rpcbind version 4. |
| 864 | * |
| 865 | * Returns zero on success; a negative errno value is returned |
| 866 | * if any error occurs. |
| 867 | */ |
Chuck Lever | 363f724 | 2009-03-18 20:47:44 -0400 | [diff] [blame] | 868 | static int __svc_register(const char *progname, |
| 869 | const u32 program, const u32 version, |
Chuck Lever | 4b62e58 | 2009-03-18 20:46:06 -0400 | [diff] [blame] | 870 | const int family, |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 871 | const unsigned short protocol, |
| 872 | const unsigned short port) |
| 873 | { |
Chuck Lever | 363f724 | 2009-03-18 20:47:44 -0400 | [diff] [blame] | 874 | int error = -EAFNOSUPPORT; |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 875 | |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 876 | switch (family) { |
Chuck Lever | 4b62e58 | 2009-03-18 20:46:06 -0400 | [diff] [blame] | 877 | case PF_INET: |
Chuck Lever | 363f724 | 2009-03-18 20:47:44 -0400 | [diff] [blame] | 878 | error = __svc_rpcb_register4(program, version, |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 879 | protocol, port); |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 880 | break; |
| 881 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Chuck Lever | 4b62e58 | 2009-03-18 20:46:06 -0400 | [diff] [blame] | 882 | case PF_INET6: |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 883 | error = __svc_rpcb_register6(program, version, |
| 884 | protocol, port); |
Chuck Lever | cadc0fa | 2009-03-18 20:47:36 -0400 | [diff] [blame] | 885 | #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 886 | } |
| 887 | |
Chuck Lever | 363f724 | 2009-03-18 20:47:44 -0400 | [diff] [blame] | 888 | if (error < 0) |
| 889 | printk(KERN_WARNING "svc: failed to register %sv%u RPC " |
| 890 | "service (errno %d).\n", progname, version, -error); |
| 891 | return error; |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 892 | } |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 893 | |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 894 | /** |
| 895 | * svc_register - register an RPC service with the local portmapper |
| 896 | * @serv: svc_serv struct for the service to register |
Chuck Lever | 4b62e58 | 2009-03-18 20:46:06 -0400 | [diff] [blame] | 897 | * @family: protocol family of service's listener socket |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 898 | * @proto: transport protocol number to advertise |
| 899 | * @port: port to advertise |
| 900 | * |
Chuck Lever | 4b62e58 | 2009-03-18 20:46:06 -0400 | [diff] [blame] | 901 | * Service is registered for any address in the passed-in protocol family |
Chuck Lever | a26cfad | 2008-08-18 19:34:16 -0400 | [diff] [blame] | 902 | */ |
Chuck Lever | 4b62e58 | 2009-03-18 20:46:06 -0400 | [diff] [blame] | 903 | int svc_register(const struct svc_serv *serv, const int family, |
| 904 | const unsigned short proto, const unsigned short port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | { |
| 906 | struct svc_program *progp; |
Chuck Lever | ea339d4 | 2007-10-26 13:32:56 -0400 | [diff] [blame] | 907 | unsigned int i; |
Chuck Lever | 14aeb21 | 2008-08-18 19:34:00 -0400 | [diff] [blame] | 908 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 910 | BUG_ON(proto == 0 && port == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 912 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { |
| 913 | for (i = 0; i < progp->pg_nvers; i++) { |
| 914 | if (progp->pg_vers[i] == NULL) |
| 915 | continue; |
| 916 | |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 917 | dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n", |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 918 | progp->pg_name, |
Chuck Lever | 2c7eb0b | 2008-09-15 16:27:23 -0500 | [diff] [blame] | 919 | i, |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 920 | proto == IPPROTO_UDP? "udp" : "tcp", |
| 921 | port, |
Chuck Lever | 4b62e58 | 2009-03-18 20:46:06 -0400 | [diff] [blame] | 922 | family, |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 923 | progp->pg_vers[i]->vs_hidden? |
| 924 | " (but not telling portmap)" : ""); |
| 925 | |
| 926 | if (progp->pg_vers[i]->vs_hidden) |
| 927 | continue; |
| 928 | |
Chuck Lever | 363f724 | 2009-03-18 20:47:44 -0400 | [diff] [blame] | 929 | error = __svc_register(progp->pg_name, progp->pg_prog, |
| 930 | i, family, proto, port); |
Olaf Kirch | bc5fea4 | 2006-10-04 02:16:05 -0700 | [diff] [blame] | 931 | if (error < 0) |
| 932 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | } |
| 934 | } |
| 935 | |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 936 | return error; |
| 937 | } |
| 938 | |
Chuck Lever | d5a8620 | 2009-03-18 20:47:29 -0400 | [diff] [blame] | 939 | /* |
| 940 | * If user space is running rpcbind, it should take the v4 UNSET |
| 941 | * and clear everything for this [program, version]. If user space |
| 942 | * is running portmap, it will reject the v4 UNSET, but won't have |
| 943 | * any "inet6" entries anyway. So a PMAP_UNSET should be sufficient |
| 944 | * in this case to clear all existing entries for [program, version]. |
| 945 | */ |
Chuck Lever | f6fb3f6 | 2008-09-25 11:56:57 -0400 | [diff] [blame] | 946 | static void __svc_unregister(const u32 program, const u32 version, |
| 947 | const char *progname) |
| 948 | { |
| 949 | int error; |
| 950 | |
Chuck Lever | d5a8620 | 2009-03-18 20:47:29 -0400 | [diff] [blame] | 951 | error = rpcb_v4_register(program, version, NULL, ""); |
| 952 | |
| 953 | /* |
| 954 | * User space didn't support rpcbind v4, so retry this |
| 955 | * request with the legacy rpcbind v2 protocol. |
| 956 | */ |
| 957 | if (error == -EPROTONOSUPPORT) |
| 958 | error = rpcb_register(program, version, 0, 0); |
| 959 | |
Chuck Lever | f6fb3f6 | 2008-09-25 11:56:57 -0400 | [diff] [blame] | 960 | dprintk("svc: %s(%sv%u), error %d\n", |
| 961 | __func__, progname, version, error); |
| 962 | } |
| 963 | |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 964 | /* |
Chuck Lever | f6fb3f6 | 2008-09-25 11:56:57 -0400 | [diff] [blame] | 965 | * All netids, bind addresses and ports registered for [program, version] |
| 966 | * are removed from the local rpcbind database (if the service is not |
| 967 | * hidden) to make way for a new instance of the service. |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 968 | * |
Chuck Lever | f6fb3f6 | 2008-09-25 11:56:57 -0400 | [diff] [blame] | 969 | * The result of unregistration is reported via dprintk for those who want |
| 970 | * verification of the result, but is otherwise not important. |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 971 | */ |
| 972 | static void svc_unregister(const struct svc_serv *serv) |
| 973 | { |
| 974 | struct svc_program *progp; |
| 975 | unsigned long flags; |
| 976 | unsigned int i; |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 977 | |
| 978 | clear_thread_flag(TIF_SIGPENDING); |
| 979 | |
| 980 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { |
| 981 | for (i = 0; i < progp->pg_nvers; i++) { |
| 982 | if (progp->pg_vers[i] == NULL) |
| 983 | continue; |
| 984 | if (progp->pg_vers[i]->vs_hidden) |
| 985 | continue; |
| 986 | |
Chuck Lever | 7402ab19 | 2011-05-09 15:22:55 -0400 | [diff] [blame] | 987 | dprintk("svc: attempting to unregister %sv%u\n", |
| 988 | progp->pg_name, i); |
Chuck Lever | f6fb3f6 | 2008-09-25 11:56:57 -0400 | [diff] [blame] | 989 | __svc_unregister(progp->pg_prog, i, progp->pg_name); |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 990 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | } |
| 992 | |
Chuck Lever | 7252d57 | 2008-08-18 19:34:08 -0400 | [diff] [blame] | 993 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
| 994 | recalc_sigpending(); |
| 995 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | } |
| 997 | |
| 998 | /* |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 999 | * Printk the given error with the address of the client that caused it. |
| 1000 | */ |
| 1001 | static int |
| 1002 | __attribute__ ((format (printf, 2, 3))) |
| 1003 | svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) |
| 1004 | { |
| 1005 | va_list args; |
| 1006 | int r; |
| 1007 | char buf[RPC_MAX_ADDRBUFLEN]; |
| 1008 | |
| 1009 | if (!net_ratelimit()) |
| 1010 | return 0; |
| 1011 | |
| 1012 | printk(KERN_WARNING "svc: %s: ", |
| 1013 | svc_print_addr(rqstp, buf, sizeof(buf))); |
| 1014 | |
| 1015 | va_start(args, fmt); |
| 1016 | r = vprintk(fmt, args); |
| 1017 | va_end(args); |
| 1018 | |
| 1019 | return r; |
| 1020 | } |
| 1021 | |
| 1022 | /* |
Ricardo Labiaga | 1cad7ea | 2009-04-01 09:23:06 -0400 | [diff] [blame] | 1023 | * Common routine for processing the RPC request. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | */ |
Ricardo Labiaga | 1cad7ea | 2009-04-01 09:23:06 -0400 | [diff] [blame] | 1025 | static int |
| 1026 | 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] | 1027 | { |
| 1028 | struct svc_program *progp; |
| 1029 | struct svc_version *versp = NULL; /* compiler food */ |
| 1030 | struct svc_procedure *procp = NULL; |
NeilBrown | 6fb2b47 | 2006-10-02 02:17:50 -0700 | [diff] [blame] | 1031 | struct svc_serv *serv = rqstp->rq_server; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | kxdrproc_t xdr; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1033 | __be32 *statp; |
Ricardo Labiaga | 1cad7ea | 2009-04-01 09:23:06 -0400 | [diff] [blame] | 1034 | u32 prog, vers, proc; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1035 | __be32 auth_stat, rpc_stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | int auth_res; |
J.Bruce Fields | 8f8e05c | 2006-10-04 02:16:08 -0700 | [diff] [blame] | 1037 | __be32 *reply_statp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | |
| 1039 | rpc_stat = rpc_success; |
| 1040 | |
| 1041 | if (argv->iov_len < 6*4) |
| 1042 | goto err_short_len; |
| 1043 | |
J. Bruce Fields | 5c04c46 | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 1044 | /* Will be turned off only in gss privacy case: */ |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 1045 | rqstp->rq_splice_ok = 1; |
Andy Adamson | 2f42587 | 2009-04-03 08:27:32 +0300 | [diff] [blame] | 1046 | /* Will be turned off only when NFSv4 Sessions are used */ |
| 1047 | rqstp->rq_usedeferral = 1; |
J. Bruce Fields | 9e701c6 | 2011-01-02 21:56:36 -0500 | [diff] [blame] | 1048 | rqstp->rq_dropme = false; |
Tom Tucker | e831fe6 | 2007-12-30 21:07:29 -0600 | [diff] [blame] | 1049 | |
| 1050 | /* Setup reply header */ |
| 1051 | rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | svc_putu32(resv, rqstp->rq_xid); |
| 1054 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1055 | vers = svc_getnl(argv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | |
| 1057 | /* First words of reply: */ |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1058 | svc_putnl(resv, 1); /* REPLY */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | if (vers != 2) /* RPC version number */ |
| 1061 | goto err_bad_rpc; |
| 1062 | |
| 1063 | /* Save position in case we later decide to reject: */ |
J.Bruce Fields | 8f8e05c | 2006-10-04 02:16:08 -0700 | [diff] [blame] | 1064 | reply_statp = resv->iov_base + resv->iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1066 | svc_putnl(resv, 0); /* ACCEPT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1068 | rqstp->rq_prog = prog = svc_getnl(argv); /* program number */ |
| 1069 | rqstp->rq_vers = vers = svc_getnl(argv); /* version number */ |
| 1070 | rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | |
| 1072 | progp = serv->sv_program; |
NeilBrown | 80d188a | 2005-11-07 01:00:27 -0800 | [diff] [blame] | 1073 | |
| 1074 | for (progp = serv->sv_program; progp; progp = progp->pg_next) |
| 1075 | if (prog == progp->pg_prog) |
| 1076 | break; |
| 1077 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | /* |
| 1079 | * Decode auth data, and add verifier to reply buffer. |
| 1080 | * We do this before anything else in order to get a decent |
| 1081 | * auth verifier. |
| 1082 | */ |
| 1083 | auth_res = svc_authenticate(rqstp, &auth_stat); |
| 1084 | /* Also give the program a chance to reject this call: */ |
NeilBrown | 80d188a | 2005-11-07 01:00:27 -0800 | [diff] [blame] | 1085 | if (auth_res == SVC_OK && progp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | auth_stat = rpc_autherr_badcred; |
| 1087 | auth_res = progp->pg_authenticate(rqstp); |
| 1088 | } |
| 1089 | switch (auth_res) { |
| 1090 | case SVC_OK: |
| 1091 | break; |
| 1092 | case SVC_GARBAGE: |
Harshula Jayasuriya | dd35210 | 2008-02-20 10:56:56 +1100 | [diff] [blame] | 1093 | goto err_garbage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | case SVC_SYSERR: |
| 1095 | rpc_stat = rpc_system_err; |
| 1096 | goto err_bad; |
| 1097 | case SVC_DENIED: |
| 1098 | goto err_bad_auth; |
NeilBrown | 1ebede8 | 2010-08-12 17:04:07 +1000 | [diff] [blame] | 1099 | case SVC_CLOSE: |
| 1100 | if (test_bit(XPT_TEMP, &rqstp->rq_xprt->xpt_flags)) |
| 1101 | svc_close_xprt(rqstp->rq_xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | case SVC_DROP: |
| 1103 | goto dropit; |
| 1104 | case SVC_COMPLETE: |
| 1105 | goto sendit; |
| 1106 | } |
NeilBrown | 80d188a | 2005-11-07 01:00:27 -0800 | [diff] [blame] | 1107 | |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 1108 | if (progp == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | goto err_bad_prog; |
| 1110 | |
| 1111 | if (vers >= progp->pg_nvers || |
| 1112 | !(versp = progp->pg_vers[vers])) |
| 1113 | goto err_bad_vers; |
| 1114 | |
| 1115 | procp = versp->vs_proc + proc; |
| 1116 | if (proc >= versp->vs_nproc || !procp->pc_func) |
| 1117 | goto err_bad_proc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | rqstp->rq_procinfo = procp; |
| 1119 | |
| 1120 | /* Syntactic check complete */ |
| 1121 | serv->sv_stats->rpccnt++; |
| 1122 | |
| 1123 | /* Build the reply header. */ |
| 1124 | statp = resv->iov_base +resv->iov_len; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1125 | svc_putnl(resv, RPC_SUCCESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | |
| 1127 | /* Bump per-procedure stats counter */ |
| 1128 | procp->pc_count++; |
| 1129 | |
| 1130 | /* Initialize storage for argp and resp */ |
| 1131 | memset(rqstp->rq_argp, 0, procp->pc_argsize); |
| 1132 | memset(rqstp->rq_resp, 0, procp->pc_ressize); |
| 1133 | |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 1134 | /* un-reserve some of the out-queue now that we have a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | * better idea of reply size |
| 1136 | */ |
| 1137 | if (procp->pc_xdrressize) |
Jeff Layton | cd12301 | 2007-05-09 02:34:50 -0700 | [diff] [blame] | 1138 | svc_reserve_auth(rqstp, procp->pc_xdrressize<<2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | |
| 1140 | /* Call the function that processes the request. */ |
| 1141 | if (!versp->vs_dispatch) { |
| 1142 | /* Decode arguments */ |
| 1143 | xdr = procp->pc_decode; |
| 1144 | if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp)) |
| 1145 | goto err_garbage; |
| 1146 | |
| 1147 | *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); |
| 1148 | |
| 1149 | /* Encode reply */ |
J. Bruce Fields | 9e701c6 | 2011-01-02 21:56:36 -0500 | [diff] [blame] | 1150 | if (rqstp->rq_dropme) { |
NeilBrown | d343fce | 2006-10-17 00:10:18 -0700 | [diff] [blame] | 1151 | if (procp->pc_release) |
| 1152 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); |
| 1153 | goto dropit; |
| 1154 | } |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 1155 | if (*statp == rpc_success && |
| 1156 | (xdr = procp->pc_encode) && |
| 1157 | !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | dprintk("svc: failed to encode reply\n"); |
| 1159 | /* serv->sv_stats->rpcsystemerr++; */ |
| 1160 | *statp = rpc_system_err; |
| 1161 | } |
| 1162 | } else { |
| 1163 | dprintk("svc: calling dispatcher\n"); |
| 1164 | if (!versp->vs_dispatch(rqstp, statp)) { |
| 1165 | /* Release reply info */ |
| 1166 | if (procp->pc_release) |
| 1167 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); |
| 1168 | goto dropit; |
| 1169 | } |
| 1170 | } |
| 1171 | |
| 1172 | /* Check RPC status result */ |
| 1173 | if (*statp != rpc_success) |
| 1174 | resv->iov_len = ((void*)statp) - resv->iov_base + 4; |
| 1175 | |
| 1176 | /* Release reply info */ |
| 1177 | if (procp->pc_release) |
| 1178 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); |
| 1179 | |
| 1180 | if (procp->pc_encode == NULL) |
| 1181 | goto dropit; |
| 1182 | |
| 1183 | sendit: |
| 1184 | if (svc_authorise(rqstp)) |
| 1185 | goto dropit; |
Ricardo Labiaga | 1cad7ea | 2009-04-01 09:23:06 -0400 | [diff] [blame] | 1186 | return 1; /* Caller can now send it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | |
| 1188 | dropit: |
| 1189 | svc_authorise(rqstp); /* doesn't hurt to call this twice */ |
| 1190 | dprintk("svc: svc_process dropit\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | return 0; |
| 1192 | |
| 1193 | err_short_len: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1194 | svc_printk(rqstp, "short len %Zd, dropping request\n", |
| 1195 | argv->iov_len); |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1196 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | goto dropit; /* drop request */ |
| 1198 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | err_bad_rpc: |
| 1200 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1201 | svc_putnl(resv, 1); /* REJECT */ |
| 1202 | svc_putnl(resv, 0); /* RPC_MISMATCH */ |
| 1203 | svc_putnl(resv, 2); /* Only RPCv2 supported */ |
| 1204 | svc_putnl(resv, 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | goto sendit; |
| 1206 | |
| 1207 | err_bad_auth: |
| 1208 | dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat)); |
| 1209 | serv->sv_stats->rpcbadauth++; |
| 1210 | /* Restore write pointer to location of accept status: */ |
J.Bruce Fields | 8f8e05c | 2006-10-04 02:16:08 -0700 | [diff] [blame] | 1211 | xdr_ressize_check(rqstp, reply_statp); |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1212 | svc_putnl(resv, 1); /* REJECT */ |
| 1213 | svc_putnl(resv, 1); /* AUTH_ERROR */ |
| 1214 | svc_putnl(resv, ntohl(auth_stat)); /* status */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | goto sendit; |
| 1216 | |
| 1217 | err_bad_prog: |
Andreas Gruenbacher | 9ba0263 | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 1218 | dprintk("svc: unknown program %d\n", prog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1220 | svc_putnl(resv, RPC_PROG_UNAVAIL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | goto sendit; |
| 1222 | |
| 1223 | err_bad_vers: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1224 | svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n", |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1225 | vers, prog, progp->pg_name); |
| 1226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1228 | svc_putnl(resv, RPC_PROG_MISMATCH); |
| 1229 | svc_putnl(resv, progp->pg_lovers); |
| 1230 | svc_putnl(resv, progp->pg_hivers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | goto sendit; |
| 1232 | |
| 1233 | err_bad_proc: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1234 | svc_printk(rqstp, "unknown procedure (%d)\n", proc); |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1237 | svc_putnl(resv, RPC_PROC_UNAVAIL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | goto sendit; |
| 1239 | |
| 1240 | err_garbage: |
Dr. David Alan Gilbert | 354ecbb | 2007-08-25 16:09:27 +0100 | [diff] [blame] | 1241 | svc_printk(rqstp, "failed to decode args\n"); |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | rpc_stat = rpc_garbage_args; |
| 1244 | err_bad: |
| 1245 | serv->sv_stats->rpcbadfmt++; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1246 | svc_putnl(resv, ntohl(rpc_stat)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | goto sendit; |
| 1248 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 1249 | EXPORT_SYMBOL_GPL(svc_process); |
Greg Banks | 7adae48 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1250 | |
| 1251 | /* |
Ricardo Labiaga | 1cad7ea | 2009-04-01 09:23:06 -0400 | [diff] [blame] | 1252 | * Process the RPC request. |
| 1253 | */ |
| 1254 | int |
| 1255 | svc_process(struct svc_rqst *rqstp) |
| 1256 | { |
| 1257 | struct kvec *argv = &rqstp->rq_arg.head[0]; |
| 1258 | struct kvec *resv = &rqstp->rq_res.head[0]; |
| 1259 | struct svc_serv *serv = rqstp->rq_server; |
| 1260 | u32 dir; |
Ricardo Labiaga | 1cad7ea | 2009-04-01 09:23:06 -0400 | [diff] [blame] | 1261 | |
| 1262 | /* |
| 1263 | * Setup response xdr_buf. |
| 1264 | * Initially it has just one page |
| 1265 | */ |
| 1266 | rqstp->rq_resused = 1; |
| 1267 | resv->iov_base = page_address(rqstp->rq_respages[0]); |
| 1268 | resv->iov_len = 0; |
| 1269 | rqstp->rq_res.pages = rqstp->rq_respages + 1; |
| 1270 | rqstp->rq_res.len = 0; |
| 1271 | rqstp->rq_res.page_base = 0; |
| 1272 | rqstp->rq_res.page_len = 0; |
| 1273 | rqstp->rq_res.buflen = PAGE_SIZE; |
| 1274 | rqstp->rq_res.tail[0].iov_base = NULL; |
| 1275 | rqstp->rq_res.tail[0].iov_len = 0; |
| 1276 | |
| 1277 | rqstp->rq_xid = svc_getu32(argv); |
| 1278 | |
| 1279 | dir = svc_getnl(argv); |
| 1280 | if (dir != 0) { |
| 1281 | /* direction != CALL */ |
| 1282 | svc_printk(rqstp, "bad direction %d, dropping request\n", dir); |
| 1283 | serv->sv_stats->rpcbadfmt++; |
| 1284 | svc_drop(rqstp); |
| 1285 | return 0; |
| 1286 | } |
| 1287 | |
Andy Adamson | 4b5b3ba | 2011-01-06 02:04:24 +0000 | [diff] [blame] | 1288 | /* Returns 1 for send, 0 for drop */ |
| 1289 | if (svc_process_common(rqstp, argv, resv)) |
| 1290 | return svc_send(rqstp); |
| 1291 | else { |
| 1292 | svc_drop(rqstp); |
| 1293 | return 0; |
| 1294 | } |
Ricardo Labiaga | 1cad7ea | 2009-04-01 09:23:06 -0400 | [diff] [blame] | 1295 | } |
| 1296 | |
Trond Myklebust | 9e00abc | 2011-07-13 19:20:49 -0400 | [diff] [blame] | 1297 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
Ricardo Labiaga | 4d6bbb6 | 2009-04-01 09:23:07 -0400 | [diff] [blame] | 1298 | /* |
| 1299 | * Process a backchannel RPC request that arrived over an existing |
| 1300 | * outbound connection |
| 1301 | */ |
| 1302 | int |
| 1303 | bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req, |
| 1304 | struct svc_rqst *rqstp) |
| 1305 | { |
| 1306 | struct kvec *argv = &rqstp->rq_arg.head[0]; |
| 1307 | struct kvec *resv = &rqstp->rq_res.head[0]; |
Ricardo Labiaga | 4d6bbb6 | 2009-04-01 09:23:07 -0400 | [diff] [blame] | 1308 | |
| 1309 | /* Build the svc_rqst used by the common processing routine */ |
Andy Adamson | 4a19de0 | 2011-01-06 02:04:35 +0000 | [diff] [blame] | 1310 | rqstp->rq_xprt = serv->sv_bc_xprt; |
Ricardo Labiaga | 4d6bbb6 | 2009-04-01 09:23:07 -0400 | [diff] [blame] | 1311 | rqstp->rq_xid = req->rq_xid; |
| 1312 | rqstp->rq_prot = req->rq_xprt->prot; |
| 1313 | rqstp->rq_server = serv; |
| 1314 | |
| 1315 | rqstp->rq_addrlen = sizeof(req->rq_xprt->addr); |
| 1316 | memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen); |
| 1317 | memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg)); |
| 1318 | memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res)); |
| 1319 | |
| 1320 | /* reset result send buffer "put" position */ |
| 1321 | resv->iov_len = 0; |
| 1322 | |
| 1323 | if (rqstp->rq_prot != IPPROTO_TCP) { |
| 1324 | printk(KERN_ERR "No support for Non-TCP transports!\n"); |
| 1325 | BUG(); |
| 1326 | } |
| 1327 | |
| 1328 | /* |
| 1329 | * Skip the next two words because they've already been |
| 1330 | * processed in the trasport |
| 1331 | */ |
| 1332 | svc_getu32(argv); /* XID */ |
| 1333 | svc_getnl(argv); /* CALLDIR */ |
| 1334 | |
Andy Adamson | 4b5b3ba | 2011-01-06 02:04:24 +0000 | [diff] [blame] | 1335 | /* Returns 1 for send, 0 for drop */ |
| 1336 | if (svc_process_common(rqstp, argv, resv)) { |
| 1337 | memcpy(&req->rq_snd_buf, &rqstp->rq_res, |
| 1338 | sizeof(req->rq_snd_buf)); |
| 1339 | return bc_send(req); |
| 1340 | } else { |
| 1341 | /* Nothing to do to drop request */ |
| 1342 | return 0; |
| 1343 | } |
Ricardo Labiaga | 4d6bbb6 | 2009-04-01 09:23:07 -0400 | [diff] [blame] | 1344 | } |
Trond Myklebust | 0d961aa | 2011-07-13 19:24:15 -0400 | [diff] [blame] | 1345 | EXPORT_SYMBOL_GPL(bc_svc_process); |
Trond Myklebust | 9e00abc | 2011-07-13 19:20:49 -0400 | [diff] [blame] | 1346 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
Ricardo Labiaga | 4d6bbb6 | 2009-04-01 09:23:07 -0400 | [diff] [blame] | 1347 | |
Ricardo Labiaga | 1cad7ea | 2009-04-01 09:23:06 -0400 | [diff] [blame] | 1348 | /* |
Greg Banks | 7adae48 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1349 | * Return (transport-specific) limit on the rpc payload. |
| 1350 | */ |
| 1351 | u32 svc_max_payload(const struct svc_rqst *rqstp) |
| 1352 | { |
Tom Tucker | 4902315 | 2007-12-30 21:07:21 -0600 | [diff] [blame] | 1353 | u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload; |
Greg Banks | 7adae48 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1354 | |
NeilBrown | c6b0a9f | 2006-10-06 00:44:05 -0700 | [diff] [blame] | 1355 | if (rqstp->rq_server->sv_max_payload < max) |
| 1356 | max = rqstp->rq_server->sv_max_payload; |
Greg Banks | 7adae48 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1357 | return max; |
| 1358 | } |
| 1359 | EXPORT_SYMBOL_GPL(svc_max_payload); |