| 1 | /* |
| 2 | * linux/fs/nfsd/nfssvc.c |
| 3 | * |
| 4 | * Central processing for nfsd. |
| 5 | * |
| 6 | * Authors: Olaf Kirch (okir@monad.swb.de) |
| 7 | * |
| 8 | * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> |
| 9 | */ |
| 10 | |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/sched.h> |
| 13 | #include <linux/time.h> |
| 14 | #include <linux/errno.h> |
| 15 | #include <linux/nfs.h> |
| 16 | #include <linux/in.h> |
| 17 | #include <linux/uio.h> |
| 18 | #include <linux/unistd.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/smp.h> |
| 21 | #include <linux/smp_lock.h> |
| 22 | #include <linux/freezer.h> |
| 23 | #include <linux/fs_struct.h> |
| 24 | #include <linux/kthread.h> |
| 25 | |
| 26 | #include <linux/sunrpc/types.h> |
| 27 | #include <linux/sunrpc/stats.h> |
| 28 | #include <linux/sunrpc/svc.h> |
| 29 | #include <linux/sunrpc/svcsock.h> |
| 30 | #include <linux/sunrpc/cache.h> |
| 31 | #include <linux/nfsd/nfsd.h> |
| 32 | #include <linux/nfsd/stats.h> |
| 33 | #include <linux/nfsd/cache.h> |
| 34 | #include <linux/nfsd/syscall.h> |
| 35 | #include <linux/lockd/bind.h> |
| 36 | #include <linux/nfsacl.h> |
| 37 | |
| 38 | #define NFSDDBG_FACILITY NFSDDBG_SVC |
| 39 | |
| 40 | /* these signals will be delivered to an nfsd thread |
| 41 | * when handling a request |
| 42 | */ |
| 43 | #define ALLOWED_SIGS (sigmask(SIGKILL)) |
| 44 | /* these signals will be delivered to an nfsd thread |
| 45 | * when not handling a request. i.e. when waiting |
| 46 | */ |
| 47 | #define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT)) |
| 48 | |
| 49 | extern struct svc_program nfsd_program; |
| 50 | static int nfsd(void *vrqstp); |
| 51 | struct timeval nfssvc_boot; |
| 52 | static atomic_t nfsd_busy; |
| 53 | static unsigned long nfsd_last_call; |
| 54 | static DEFINE_SPINLOCK(nfsd_call_lock); |
| 55 | |
| 56 | /* |
| 57 | * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members |
| 58 | * of the svc_serv struct. In particular, ->sv_nrthreads but also to some |
| 59 | * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt |
| 60 | * |
| 61 | * If (out side the lock) nfsd_serv is non-NULL, then it must point to a |
| 62 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number |
| 63 | * of nfsd threads must exist and each must listed in ->sp_all_threads in each |
| 64 | * entry of ->sv_pools[]. |
| 65 | * |
| 66 | * Transitions of the thread count between zero and non-zero are of particular |
| 67 | * interest since the svc_serv needs to be created and initialized at that |
| 68 | * point, or freed. |
| 69 | * |
| 70 | * Finally, the nfsd_mutex also protects some of the global variables that are |
| 71 | * accessed when nfsd starts and that are settable via the write_* routines in |
| 72 | * nfsctl.c. In particular: |
| 73 | * |
| 74 | * user_recovery_dirname |
| 75 | * user_lease_time |
| 76 | * nfsd_versions |
| 77 | */ |
| 78 | DEFINE_MUTEX(nfsd_mutex); |
| 79 | struct svc_serv *nfsd_serv; |
| 80 | |
| 81 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 82 | static struct svc_stat nfsd_acl_svcstats; |
| 83 | static struct svc_version * nfsd_acl_version[] = { |
| 84 | [2] = &nfsd_acl_version2, |
| 85 | [3] = &nfsd_acl_version3, |
| 86 | }; |
| 87 | |
| 88 | #define NFSD_ACL_MINVERS 2 |
| 89 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
| 90 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
| 91 | |
| 92 | static struct svc_program nfsd_acl_program = { |
| 93 | .pg_prog = NFS_ACL_PROGRAM, |
| 94 | .pg_nvers = NFSD_ACL_NRVERS, |
| 95 | .pg_vers = nfsd_acl_versions, |
| 96 | .pg_name = "nfsacl", |
| 97 | .pg_class = "nfsd", |
| 98 | .pg_stats = &nfsd_acl_svcstats, |
| 99 | .pg_authenticate = &svc_set_client, |
| 100 | }; |
| 101 | |
| 102 | static struct svc_stat nfsd_acl_svcstats = { |
| 103 | .program = &nfsd_acl_program, |
| 104 | }; |
| 105 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |
| 106 | |
| 107 | static struct svc_version * nfsd_version[] = { |
| 108 | [2] = &nfsd_version2, |
| 109 | #if defined(CONFIG_NFSD_V3) |
| 110 | [3] = &nfsd_version3, |
| 111 | #endif |
| 112 | #if defined(CONFIG_NFSD_V4) |
| 113 | [4] = &nfsd_version4, |
| 114 | #endif |
| 115 | }; |
| 116 | |
| 117 | #define NFSD_MINVERS 2 |
| 118 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
| 119 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
| 120 | |
| 121 | struct svc_program nfsd_program = { |
| 122 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 123 | .pg_next = &nfsd_acl_program, |
| 124 | #endif |
| 125 | .pg_prog = NFS_PROGRAM, /* program number */ |
| 126 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ |
| 127 | .pg_vers = nfsd_versions, /* version table */ |
| 128 | .pg_name = "nfsd", /* program name */ |
| 129 | .pg_class = "nfsd", /* authentication class */ |
| 130 | .pg_stats = &nfsd_svcstats, /* version table */ |
| 131 | .pg_authenticate = &svc_set_client, /* export authentication */ |
| 132 | |
| 133 | }; |
| 134 | |
| 135 | int nfsd_vers(int vers, enum vers_op change) |
| 136 | { |
| 137 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) |
| 138 | return -1; |
| 139 | switch(change) { |
| 140 | case NFSD_SET: |
| 141 | nfsd_versions[vers] = nfsd_version[vers]; |
| 142 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 143 | if (vers < NFSD_ACL_NRVERS) |
| 144 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
| 145 | #endif |
| 146 | break; |
| 147 | case NFSD_CLEAR: |
| 148 | nfsd_versions[vers] = NULL; |
| 149 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 150 | if (vers < NFSD_ACL_NRVERS) |
| 151 | nfsd_acl_versions[vers] = NULL; |
| 152 | #endif |
| 153 | break; |
| 154 | case NFSD_TEST: |
| 155 | return nfsd_versions[vers] != NULL; |
| 156 | case NFSD_AVAIL: |
| 157 | return nfsd_version[vers] != NULL; |
| 158 | } |
| 159 | return 0; |
| 160 | } |
| 161 | /* |
| 162 | * Maximum number of nfsd processes |
| 163 | */ |
| 164 | #define NFSD_MAXSERVS 8192 |
| 165 | |
| 166 | int nfsd_nrthreads(void) |
| 167 | { |
| 168 | int rv = 0; |
| 169 | mutex_lock(&nfsd_mutex); |
| 170 | if (nfsd_serv) |
| 171 | rv = nfsd_serv->sv_nrthreads; |
| 172 | mutex_unlock(&nfsd_mutex); |
| 173 | return rv; |
| 174 | } |
| 175 | |
| 176 | static void nfsd_last_thread(struct svc_serv *serv) |
| 177 | { |
| 178 | /* When last nfsd thread exits we need to do some clean-up */ |
| 179 | struct svc_xprt *xprt; |
| 180 | list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) |
| 181 | lockd_down(); |
| 182 | nfsd_serv = NULL; |
| 183 | nfsd_racache_shutdown(); |
| 184 | nfs4_state_shutdown(); |
| 185 | |
| 186 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
| 187 | "cache\n"); |
| 188 | nfsd_export_flush(); |
| 189 | } |
| 190 | |
| 191 | void nfsd_reset_versions(void) |
| 192 | { |
| 193 | int found_one = 0; |
| 194 | int i; |
| 195 | |
| 196 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { |
| 197 | if (nfsd_program.pg_vers[i]) |
| 198 | found_one = 1; |
| 199 | } |
| 200 | |
| 201 | if (!found_one) { |
| 202 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) |
| 203 | nfsd_program.pg_vers[i] = nfsd_version[i]; |
| 204 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 205 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) |
| 206 | nfsd_acl_program.pg_vers[i] = |
| 207 | nfsd_acl_version[i]; |
| 208 | #endif |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | |
| 213 | int nfsd_create_serv(void) |
| 214 | { |
| 215 | int err = 0; |
| 216 | |
| 217 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
| 218 | if (nfsd_serv) { |
| 219 | svc_get(nfsd_serv); |
| 220 | return 0; |
| 221 | } |
| 222 | if (nfsd_max_blksize == 0) { |
| 223 | /* choose a suitable default */ |
| 224 | struct sysinfo i; |
| 225 | si_meminfo(&i); |
| 226 | /* Aim for 1/4096 of memory per thread |
| 227 | * This gives 1MB on 4Gig machines |
| 228 | * But only uses 32K on 128M machines. |
| 229 | * Bottom out at 8K on 32M and smaller. |
| 230 | * Of course, this is only a default. |
| 231 | */ |
| 232 | nfsd_max_blksize = NFSSVC_MAXBLKSIZE; |
| 233 | i.totalram <<= PAGE_SHIFT - 12; |
| 234 | while (nfsd_max_blksize > i.totalram && |
| 235 | nfsd_max_blksize >= 8*1024*2) |
| 236 | nfsd_max_blksize /= 2; |
| 237 | } |
| 238 | |
| 239 | atomic_set(&nfsd_busy, 0); |
| 240 | nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
| 241 | nfsd_last_thread, nfsd, THIS_MODULE); |
| 242 | if (nfsd_serv == NULL) |
| 243 | err = -ENOMEM; |
| 244 | |
| 245 | do_gettimeofday(&nfssvc_boot); /* record boot time */ |
| 246 | return err; |
| 247 | } |
| 248 | |
| 249 | static int nfsd_init_socks(int port) |
| 250 | { |
| 251 | int error; |
| 252 | if (!list_empty(&nfsd_serv->sv_permsocks)) |
| 253 | return 0; |
| 254 | |
| 255 | error = lockd_up(IPPROTO_UDP); |
| 256 | if (error >= 0) { |
| 257 | error = svc_create_xprt(nfsd_serv, "udp", port, |
| 258 | SVC_SOCK_DEFAULTS); |
| 259 | if (error < 0) |
| 260 | lockd_down(); |
| 261 | } |
| 262 | if (error < 0) |
| 263 | return error; |
| 264 | |
| 265 | error = lockd_up(IPPROTO_TCP); |
| 266 | if (error >= 0) { |
| 267 | error = svc_create_xprt(nfsd_serv, "tcp", port, |
| 268 | SVC_SOCK_DEFAULTS); |
| 269 | if (error < 0) |
| 270 | lockd_down(); |
| 271 | } |
| 272 | if (error < 0) |
| 273 | return error; |
| 274 | return 0; |
| 275 | } |
| 276 | |
| 277 | int nfsd_nrpools(void) |
| 278 | { |
| 279 | if (nfsd_serv == NULL) |
| 280 | return 0; |
| 281 | else |
| 282 | return nfsd_serv->sv_nrpools; |
| 283 | } |
| 284 | |
| 285 | int nfsd_get_nrthreads(int n, int *nthreads) |
| 286 | { |
| 287 | int i = 0; |
| 288 | |
| 289 | if (nfsd_serv != NULL) { |
| 290 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) |
| 291 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; |
| 292 | } |
| 293 | |
| 294 | return 0; |
| 295 | } |
| 296 | |
| 297 | int nfsd_set_nrthreads(int n, int *nthreads) |
| 298 | { |
| 299 | int i = 0; |
| 300 | int tot = 0; |
| 301 | int err = 0; |
| 302 | |
| 303 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
| 304 | |
| 305 | if (nfsd_serv == NULL || n <= 0) |
| 306 | return 0; |
| 307 | |
| 308 | if (n > nfsd_serv->sv_nrpools) |
| 309 | n = nfsd_serv->sv_nrpools; |
| 310 | |
| 311 | /* enforce a global maximum number of threads */ |
| 312 | tot = 0; |
| 313 | for (i = 0; i < n; i++) { |
| 314 | if (nthreads[i] > NFSD_MAXSERVS) |
| 315 | nthreads[i] = NFSD_MAXSERVS; |
| 316 | tot += nthreads[i]; |
| 317 | } |
| 318 | if (tot > NFSD_MAXSERVS) { |
| 319 | /* total too large: scale down requested numbers */ |
| 320 | for (i = 0; i < n && tot > 0; i++) { |
| 321 | int new = nthreads[i] * NFSD_MAXSERVS / tot; |
| 322 | tot -= (nthreads[i] - new); |
| 323 | nthreads[i] = new; |
| 324 | } |
| 325 | for (i = 0; i < n && tot > 0; i++) { |
| 326 | nthreads[i]--; |
| 327 | tot--; |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * There must always be a thread in pool 0; the admin |
| 333 | * can't shut down NFS completely using pool_threads. |
| 334 | */ |
| 335 | if (nthreads[0] == 0) |
| 336 | nthreads[0] = 1; |
| 337 | |
| 338 | /* apply the new numbers */ |
| 339 | svc_get(nfsd_serv); |
| 340 | for (i = 0; i < n; i++) { |
| 341 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], |
| 342 | nthreads[i]); |
| 343 | if (err) |
| 344 | break; |
| 345 | } |
| 346 | svc_destroy(nfsd_serv); |
| 347 | |
| 348 | return err; |
| 349 | } |
| 350 | |
| 351 | int |
| 352 | nfsd_svc(unsigned short port, int nrservs) |
| 353 | { |
| 354 | int error; |
| 355 | |
| 356 | mutex_lock(&nfsd_mutex); |
| 357 | dprintk("nfsd: creating service\n"); |
| 358 | error = -EINVAL; |
| 359 | if (nrservs <= 0) |
| 360 | nrservs = 0; |
| 361 | if (nrservs > NFSD_MAXSERVS) |
| 362 | nrservs = NFSD_MAXSERVS; |
| 363 | |
| 364 | /* Readahead param cache - will no-op if it already exists */ |
| 365 | error = nfsd_racache_init(2*nrservs); |
| 366 | if (error<0) |
| 367 | goto out; |
| 368 | nfs4_state_start(); |
| 369 | |
| 370 | nfsd_reset_versions(); |
| 371 | |
| 372 | error = nfsd_create_serv(); |
| 373 | |
| 374 | if (error) |
| 375 | goto out; |
| 376 | error = nfsd_init_socks(port); |
| 377 | if (error) |
| 378 | goto failure; |
| 379 | |
| 380 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
| 381 | failure: |
| 382 | svc_destroy(nfsd_serv); /* Release server */ |
| 383 | out: |
| 384 | mutex_unlock(&nfsd_mutex); |
| 385 | return error; |
| 386 | } |
| 387 | |
| 388 | static inline void |
| 389 | update_thread_usage(int busy_threads) |
| 390 | { |
| 391 | unsigned long prev_call; |
| 392 | unsigned long diff; |
| 393 | int decile; |
| 394 | |
| 395 | spin_lock(&nfsd_call_lock); |
| 396 | prev_call = nfsd_last_call; |
| 397 | nfsd_last_call = jiffies; |
| 398 | decile = busy_threads*10/nfsdstats.th_cnt; |
| 399 | if (decile>0 && decile <= 10) { |
| 400 | diff = nfsd_last_call - prev_call; |
| 401 | if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP) |
| 402 | nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP; |
| 403 | if (decile == 10) |
| 404 | nfsdstats.th_fullcnt++; |
| 405 | } |
| 406 | spin_unlock(&nfsd_call_lock); |
| 407 | } |
| 408 | |
| 409 | /* |
| 410 | * This is the NFS server kernel thread |
| 411 | */ |
| 412 | static int |
| 413 | nfsd(void *vrqstp) |
| 414 | { |
| 415 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
| 416 | struct fs_struct *fsp; |
| 417 | sigset_t shutdown_mask, allowed_mask; |
| 418 | int err, preverr = 0; |
| 419 | unsigned int signo; |
| 420 | |
| 421 | /* Lock module and set up kernel thread */ |
| 422 | mutex_lock(&nfsd_mutex); |
| 423 | |
| 424 | /* At this point, the thread shares current->fs |
| 425 | * with the init process. We need to create files with a |
| 426 | * umask of 0 instead of init's umask. */ |
| 427 | fsp = copy_fs_struct(current->fs); |
| 428 | if (!fsp) { |
| 429 | printk("Unable to start nfsd thread: out of memory\n"); |
| 430 | goto out; |
| 431 | } |
| 432 | exit_fs(current); |
| 433 | current->fs = fsp; |
| 434 | current->fs->umask = 0; |
| 435 | |
| 436 | siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS); |
| 437 | siginitsetinv(&allowed_mask, ALLOWED_SIGS); |
| 438 | |
| 439 | /* |
| 440 | * thread is spawned with all signals set to SIG_IGN, re-enable |
| 441 | * the ones that matter |
| 442 | */ |
| 443 | for (signo = 1; signo <= _NSIG; signo++) { |
| 444 | if (!sigismember(&shutdown_mask, signo)) |
| 445 | allow_signal(signo); |
| 446 | } |
| 447 | |
| 448 | nfsdstats.th_cnt++; |
| 449 | mutex_unlock(&nfsd_mutex); |
| 450 | |
| 451 | /* |
| 452 | * We want less throttling in balance_dirty_pages() so that nfs to |
| 453 | * localhost doesn't cause nfsd to lock up due to all the client's |
| 454 | * dirty pages. |
| 455 | */ |
| 456 | current->flags |= PF_LESS_THROTTLE; |
| 457 | set_freezable(); |
| 458 | |
| 459 | /* |
| 460 | * The main request loop |
| 461 | */ |
| 462 | for (;;) { |
| 463 | /* Block all but the shutdown signals */ |
| 464 | sigprocmask(SIG_SETMASK, &shutdown_mask, NULL); |
| 465 | |
| 466 | /* |
| 467 | * Find a socket with data available and call its |
| 468 | * recvfrom routine. |
| 469 | */ |
| 470 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
| 471 | ; |
| 472 | if (err == -EINTR) |
| 473 | break; |
| 474 | else if (err < 0) { |
| 475 | if (err != preverr) { |
| 476 | printk(KERN_WARNING "%s: unexpected error " |
| 477 | "from svc_recv (%d)\n", __func__, -err); |
| 478 | preverr = err; |
| 479 | } |
| 480 | schedule_timeout_uninterruptible(HZ); |
| 481 | continue; |
| 482 | } |
| 483 | |
| 484 | update_thread_usage(atomic_read(&nfsd_busy)); |
| 485 | atomic_inc(&nfsd_busy); |
| 486 | |
| 487 | /* Lock the export hash tables for reading. */ |
| 488 | exp_readlock(); |
| 489 | |
| 490 | /* Process request with signals blocked. */ |
| 491 | sigprocmask(SIG_SETMASK, &allowed_mask, NULL); |
| 492 | |
| 493 | svc_process(rqstp); |
| 494 | |
| 495 | /* Unlock export hash tables */ |
| 496 | exp_readunlock(); |
| 497 | update_thread_usage(atomic_read(&nfsd_busy)); |
| 498 | atomic_dec(&nfsd_busy); |
| 499 | } |
| 500 | |
| 501 | /* Clear signals before calling svc_exit_thread() */ |
| 502 | flush_signals(current); |
| 503 | |
| 504 | mutex_lock(&nfsd_mutex); |
| 505 | nfsdstats.th_cnt --; |
| 506 | |
| 507 | out: |
| 508 | /* Release the thread */ |
| 509 | svc_exit_thread(rqstp); |
| 510 | |
| 511 | /* Release module */ |
| 512 | mutex_unlock(&nfsd_mutex); |
| 513 | module_put_and_exit(0); |
| 514 | return 0; |
| 515 | } |
| 516 | |
| 517 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
| 518 | { |
| 519 | if (nfserr == nfserr_jukebox && vers == 2) |
| 520 | return nfserr_dropit; |
| 521 | if (nfserr == nfserr_wrongsec && vers < 4) |
| 522 | return nfserr_acces; |
| 523 | return nfserr; |
| 524 | } |
| 525 | |
| 526 | int |
| 527 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
| 528 | { |
| 529 | struct svc_procedure *proc; |
| 530 | kxdrproc_t xdr; |
| 531 | __be32 nfserr; |
| 532 | __be32 *nfserrp; |
| 533 | |
| 534 | dprintk("nfsd_dispatch: vers %d proc %d\n", |
| 535 | rqstp->rq_vers, rqstp->rq_proc); |
| 536 | proc = rqstp->rq_procinfo; |
| 537 | |
| 538 | /* Check whether we have this call in the cache. */ |
| 539 | switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) { |
| 540 | case RC_INTR: |
| 541 | case RC_DROPIT: |
| 542 | return 0; |
| 543 | case RC_REPLY: |
| 544 | return 1; |
| 545 | case RC_DOIT:; |
| 546 | /* do it */ |
| 547 | } |
| 548 | |
| 549 | /* Decode arguments */ |
| 550 | xdr = proc->pc_decode; |
| 551 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, |
| 552 | rqstp->rq_argp)) { |
| 553 | dprintk("nfsd: failed to decode arguments!\n"); |
| 554 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
| 555 | *statp = rpc_garbage_args; |
| 556 | return 1; |
| 557 | } |
| 558 | |
| 559 | /* need to grab the location to store the status, as |
| 560 | * nfsv4 does some encoding while processing |
| 561 | */ |
| 562 | nfserrp = rqstp->rq_res.head[0].iov_base |
| 563 | + rqstp->rq_res.head[0].iov_len; |
| 564 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
| 565 | |
| 566 | /* Now call the procedure handler, and encode NFS status. */ |
| 567 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); |
| 568 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
| 569 | if (nfserr == nfserr_dropit) { |
| 570 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
| 571 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
| 572 | return 0; |
| 573 | } |
| 574 | |
| 575 | if (rqstp->rq_proc != 0) |
| 576 | *nfserrp++ = nfserr; |
| 577 | |
| 578 | /* Encode result. |
| 579 | * For NFSv2, additional info is never returned in case of an error. |
| 580 | */ |
| 581 | if (!(nfserr && rqstp->rq_vers == 2)) { |
| 582 | xdr = proc->pc_encode; |
| 583 | if (xdr && !xdr(rqstp, nfserrp, |
| 584 | rqstp->rq_resp)) { |
| 585 | /* Failed to encode result. Release cache entry */ |
| 586 | dprintk("nfsd: failed to encode result!\n"); |
| 587 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
| 588 | *statp = rpc_system_err; |
| 589 | return 1; |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | /* Store reply in cache. */ |
| 594 | nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); |
| 595 | return 1; |
| 596 | } |