| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Central processing for nfsd. |
| 4 | * |
| 5 | * Authors: Olaf Kirch (okir@monad.swb.de) |
| 6 | * |
| 7 | * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> |
| 8 | */ |
| 9 | |
| 10 | #include <linux/sched/signal.h> |
| 11 | #include <linux/freezer.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/fs_struct.h> |
| 14 | #include <linux/swap.h> |
| 15 | #include <linux/siphash.h> |
| 16 | |
| 17 | #include <linux/sunrpc/stats.h> |
| 18 | #include <linux/sunrpc/svcsock.h> |
| 19 | #include <linux/sunrpc/svc_xprt.h> |
| 20 | #include <linux/lockd/bind.h> |
| 21 | #include <linux/nfsacl.h> |
| 22 | #include <linux/nfslocalio.h> |
| 23 | #include <linux/seq_file.h> |
| 24 | #include <linux/inetdevice.h> |
| 25 | #include <net/addrconf.h> |
| 26 | #include <net/ipv6.h> |
| 27 | #include <net/net_namespace.h> |
| 28 | #include "nfsd.h" |
| 29 | #include "cache.h" |
| 30 | #include "vfs.h" |
| 31 | #include "netns.h" |
| 32 | #include "filecache.h" |
| 33 | |
| 34 | #include "trace.h" |
| 35 | |
| 36 | #define NFSDDBG_FACILITY NFSDDBG_SVC |
| 37 | |
| 38 | atomic_t nfsd_th_cnt = ATOMIC_INIT(0); |
| 39 | static int nfsd(void *vrqstp); |
| 40 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 41 | static int nfsd_acl_rpcbind_set(struct net *, |
| 42 | const struct svc_program *, |
| 43 | u32, int, |
| 44 | unsigned short, |
| 45 | unsigned short); |
| 46 | static __be32 nfsd_acl_init_request(struct svc_rqst *, |
| 47 | const struct svc_program *, |
| 48 | struct svc_process_info *); |
| 49 | #endif |
| 50 | static int nfsd_rpcbind_set(struct net *, |
| 51 | const struct svc_program *, |
| 52 | u32, int, |
| 53 | unsigned short, |
| 54 | unsigned short); |
| 55 | static __be32 nfsd_init_request(struct svc_rqst *, |
| 56 | const struct svc_program *, |
| 57 | struct svc_process_info *); |
| 58 | |
| 59 | /* |
| 60 | * nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and some members |
| 61 | * of the svc_serv struct such as ->sv_temp_socks and ->sv_permsocks. |
| 62 | * |
| 63 | * Finally, the nfsd_mutex also protects some of the global variables that are |
| 64 | * accessed when nfsd starts and that are settable via the write_* routines in |
| 65 | * nfsctl.c. In particular: |
| 66 | * |
| 67 | * user_recovery_dirname |
| 68 | * user_lease_time |
| 69 | * nfsd_versions |
| 70 | */ |
| 71 | DEFINE_MUTEX(nfsd_mutex); |
| 72 | |
| 73 | /* |
| 74 | * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used. |
| 75 | * nfsd_drc_max_pages limits the total amount of memory available for |
| 76 | * version 4.1 DRC caches. |
| 77 | * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage. |
| 78 | */ |
| 79 | DEFINE_SPINLOCK(nfsd_drc_lock); |
| 80 | unsigned long nfsd_drc_max_mem; |
| 81 | unsigned long nfsd_drc_mem_used; |
| 82 | |
| 83 | #if IS_ENABLED(CONFIG_NFS_LOCALIO) |
| 84 | static const struct svc_version *localio_versions[] = { |
| 85 | [1] = &localio_version1, |
| 86 | }; |
| 87 | |
| 88 | #define NFSD_LOCALIO_NRVERS ARRAY_SIZE(localio_versions) |
| 89 | |
| 90 | #endif /* CONFIG_NFS_LOCALIO */ |
| 91 | |
| 92 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 93 | static const struct svc_version *nfsd_acl_version[] = { |
| 94 | # if defined(CONFIG_NFSD_V2_ACL) |
| 95 | [2] = &nfsd_acl_version2, |
| 96 | # endif |
| 97 | # if defined(CONFIG_NFSD_V3_ACL) |
| 98 | [3] = &nfsd_acl_version3, |
| 99 | # endif |
| 100 | }; |
| 101 | |
| 102 | #define NFSD_ACL_MINVERS 2 |
| 103 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
| 104 | |
| 105 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |
| 106 | |
| 107 | static const struct svc_version *nfsd_version[NFSD_MAXVERS+1] = { |
| 108 | #if defined(CONFIG_NFSD_V2) |
| 109 | [2] = &nfsd_version2, |
| 110 | #endif |
| 111 | [3] = &nfsd_version3, |
| 112 | #if defined(CONFIG_NFSD_V4) |
| 113 | [4] = &nfsd_version4, |
| 114 | #endif |
| 115 | }; |
| 116 | |
| 117 | struct svc_program nfsd_programs[] = { |
| 118 | { |
| 119 | .pg_prog = NFS_PROGRAM, /* program number */ |
| 120 | .pg_nvers = NFSD_MAXVERS+1, /* nr of entries in nfsd_version */ |
| 121 | .pg_vers = nfsd_version, /* version table */ |
| 122 | .pg_name = "nfsd", /* program name */ |
| 123 | .pg_class = "nfsd", /* authentication class */ |
| 124 | .pg_authenticate = svc_set_client, /* export authentication */ |
| 125 | .pg_init_request = nfsd_init_request, |
| 126 | .pg_rpcbind_set = nfsd_rpcbind_set, |
| 127 | }, |
| 128 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 129 | { |
| 130 | .pg_prog = NFS_ACL_PROGRAM, |
| 131 | .pg_nvers = NFSD_ACL_NRVERS, |
| 132 | .pg_vers = nfsd_acl_version, |
| 133 | .pg_name = "nfsacl", |
| 134 | .pg_class = "nfsd", |
| 135 | .pg_authenticate = svc_set_client, |
| 136 | .pg_init_request = nfsd_acl_init_request, |
| 137 | .pg_rpcbind_set = nfsd_acl_rpcbind_set, |
| 138 | }, |
| 139 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |
| 140 | #if IS_ENABLED(CONFIG_NFS_LOCALIO) |
| 141 | { |
| 142 | .pg_prog = NFS_LOCALIO_PROGRAM, |
| 143 | .pg_nvers = NFSD_LOCALIO_NRVERS, |
| 144 | .pg_vers = localio_versions, |
| 145 | .pg_name = "nfslocalio", |
| 146 | .pg_class = "nfsd", |
| 147 | .pg_authenticate = svc_set_client, |
| 148 | .pg_init_request = svc_generic_init_request, |
| 149 | .pg_rpcbind_set = svc_generic_rpcbind_set, |
| 150 | } |
| 151 | #endif /* CONFIG_NFS_LOCALIO */ |
| 152 | }; |
| 153 | |
| 154 | bool nfsd_support_version(int vers) |
| 155 | { |
| 156 | if (vers >= NFSD_MINVERS && vers <= NFSD_MAXVERS) |
| 157 | return nfsd_version[vers] != NULL; |
| 158 | return false; |
| 159 | } |
| 160 | |
| 161 | int nfsd_vers(struct nfsd_net *nn, int vers, enum vers_op change) |
| 162 | { |
| 163 | if (vers < NFSD_MINVERS || vers > NFSD_MAXVERS) |
| 164 | return 0; |
| 165 | switch(change) { |
| 166 | case NFSD_SET: |
| 167 | nn->nfsd_versions[vers] = nfsd_support_version(vers); |
| 168 | break; |
| 169 | case NFSD_CLEAR: |
| 170 | nn->nfsd_versions[vers] = false; |
| 171 | break; |
| 172 | case NFSD_TEST: |
| 173 | return nn->nfsd_versions[vers]; |
| 174 | case NFSD_AVAIL: |
| 175 | return nfsd_support_version(vers); |
| 176 | } |
| 177 | return 0; |
| 178 | } |
| 179 | |
| 180 | static void |
| 181 | nfsd_adjust_nfsd_versions4(struct nfsd_net *nn) |
| 182 | { |
| 183 | unsigned i; |
| 184 | |
| 185 | for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++) { |
| 186 | if (nn->nfsd4_minorversions[i]) |
| 187 | return; |
| 188 | } |
| 189 | nfsd_vers(nn, 4, NFSD_CLEAR); |
| 190 | } |
| 191 | |
| 192 | int nfsd_minorversion(struct nfsd_net *nn, u32 minorversion, enum vers_op change) |
| 193 | { |
| 194 | if (minorversion > NFSD_SUPPORTED_MINOR_VERSION && |
| 195 | change != NFSD_AVAIL) |
| 196 | return -1; |
| 197 | |
| 198 | switch(change) { |
| 199 | case NFSD_SET: |
| 200 | nfsd_vers(nn, 4, NFSD_SET); |
| 201 | nn->nfsd4_minorversions[minorversion] = |
| 202 | nfsd_vers(nn, 4, NFSD_TEST); |
| 203 | break; |
| 204 | case NFSD_CLEAR: |
| 205 | nn->nfsd4_minorversions[minorversion] = false; |
| 206 | nfsd_adjust_nfsd_versions4(nn); |
| 207 | break; |
| 208 | case NFSD_TEST: |
| 209 | return nn->nfsd4_minorversions[minorversion]; |
| 210 | case NFSD_AVAIL: |
| 211 | return minorversion <= NFSD_SUPPORTED_MINOR_VERSION && |
| 212 | nfsd_vers(nn, 4, NFSD_AVAIL); |
| 213 | } |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | bool nfsd_serv_try_get(struct net *net) |
| 218 | { |
| 219 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 220 | |
| 221 | return (nn && percpu_ref_tryget_live(&nn->nfsd_serv_ref)); |
| 222 | } |
| 223 | |
| 224 | void nfsd_serv_put(struct net *net) |
| 225 | { |
| 226 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 227 | |
| 228 | percpu_ref_put(&nn->nfsd_serv_ref); |
| 229 | } |
| 230 | |
| 231 | static void nfsd_serv_done(struct percpu_ref *ref) |
| 232 | { |
| 233 | struct nfsd_net *nn = container_of(ref, struct nfsd_net, nfsd_serv_ref); |
| 234 | |
| 235 | complete(&nn->nfsd_serv_confirm_done); |
| 236 | } |
| 237 | |
| 238 | static void nfsd_serv_free(struct percpu_ref *ref) |
| 239 | { |
| 240 | struct nfsd_net *nn = container_of(ref, struct nfsd_net, nfsd_serv_ref); |
| 241 | |
| 242 | complete(&nn->nfsd_serv_free_done); |
| 243 | } |
| 244 | |
| 245 | /* |
| 246 | * Maximum number of nfsd processes |
| 247 | */ |
| 248 | #define NFSD_MAXSERVS 8192 |
| 249 | |
| 250 | int nfsd_nrthreads(struct net *net) |
| 251 | { |
| 252 | int rv = 0; |
| 253 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 254 | |
| 255 | mutex_lock(&nfsd_mutex); |
| 256 | if (nn->nfsd_serv) |
| 257 | rv = nn->nfsd_serv->sv_nrthreads; |
| 258 | mutex_unlock(&nfsd_mutex); |
| 259 | return rv; |
| 260 | } |
| 261 | |
| 262 | static int nfsd_init_socks(struct net *net, const struct cred *cred) |
| 263 | { |
| 264 | int error; |
| 265 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 266 | |
| 267 | if (!list_empty(&nn->nfsd_serv->sv_permsocks)) |
| 268 | return 0; |
| 269 | |
| 270 | error = svc_xprt_create(nn->nfsd_serv, "udp", net, PF_INET, NFS_PORT, |
| 271 | SVC_SOCK_DEFAULTS, cred); |
| 272 | if (error < 0) |
| 273 | return error; |
| 274 | |
| 275 | error = svc_xprt_create(nn->nfsd_serv, "tcp", net, PF_INET, NFS_PORT, |
| 276 | SVC_SOCK_DEFAULTS, cred); |
| 277 | if (error < 0) |
| 278 | return error; |
| 279 | |
| 280 | return 0; |
| 281 | } |
| 282 | |
| 283 | static int nfsd_users = 0; |
| 284 | |
| 285 | static int nfsd_startup_generic(void) |
| 286 | { |
| 287 | int ret; |
| 288 | |
| 289 | if (nfsd_users++) |
| 290 | return 0; |
| 291 | |
| 292 | ret = nfsd_file_cache_init(); |
| 293 | if (ret) |
| 294 | goto dec_users; |
| 295 | |
| 296 | ret = nfs4_state_start(); |
| 297 | if (ret) |
| 298 | goto out_file_cache; |
| 299 | return 0; |
| 300 | |
| 301 | out_file_cache: |
| 302 | nfsd_file_cache_shutdown(); |
| 303 | dec_users: |
| 304 | nfsd_users--; |
| 305 | return ret; |
| 306 | } |
| 307 | |
| 308 | static void nfsd_shutdown_generic(void) |
| 309 | { |
| 310 | if (--nfsd_users) |
| 311 | return; |
| 312 | |
| 313 | nfs4_state_shutdown(); |
| 314 | nfsd_file_cache_shutdown(); |
| 315 | } |
| 316 | |
| 317 | static bool nfsd_needs_lockd(struct nfsd_net *nn) |
| 318 | { |
| 319 | return nfsd_vers(nn, 2, NFSD_TEST) || nfsd_vers(nn, 3, NFSD_TEST); |
| 320 | } |
| 321 | |
| 322 | /** |
| 323 | * nfsd_copy_write_verifier - Atomically copy a write verifier |
| 324 | * @verf: buffer in which to receive the verifier cookie |
| 325 | * @nn: NFS net namespace |
| 326 | * |
| 327 | * This function provides a wait-free mechanism for copying the |
| 328 | * namespace's write verifier without tearing it. |
| 329 | */ |
| 330 | void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn) |
| 331 | { |
| 332 | unsigned int seq; |
| 333 | |
| 334 | do { |
| 335 | seq = read_seqbegin(&nn->writeverf_lock); |
| 336 | memcpy(verf, nn->writeverf, sizeof(nn->writeverf)); |
| 337 | } while (read_seqretry(&nn->writeverf_lock, seq)); |
| 338 | } |
| 339 | |
| 340 | static void nfsd_reset_write_verifier_locked(struct nfsd_net *nn) |
| 341 | { |
| 342 | struct timespec64 now; |
| 343 | u64 verf; |
| 344 | |
| 345 | /* |
| 346 | * Because the time value is hashed, y2038 time_t overflow |
| 347 | * is irrelevant in this usage. |
| 348 | */ |
| 349 | ktime_get_raw_ts64(&now); |
| 350 | verf = siphash_2u64(now.tv_sec, now.tv_nsec, &nn->siphash_key); |
| 351 | memcpy(nn->writeverf, &verf, sizeof(nn->writeverf)); |
| 352 | } |
| 353 | |
| 354 | /** |
| 355 | * nfsd_reset_write_verifier - Generate a new write verifier |
| 356 | * @nn: NFS net namespace |
| 357 | * |
| 358 | * This function updates the ->writeverf field of @nn. This field |
| 359 | * contains an opaque cookie that, according to Section 18.32.3 of |
| 360 | * RFC 8881, "the client can use to determine whether a server has |
| 361 | * changed instance state (e.g., server restart) between a call to |
| 362 | * WRITE and a subsequent call to either WRITE or COMMIT. This |
| 363 | * cookie MUST be unchanged during a single instance of the NFSv4.1 |
| 364 | * server and MUST be unique between instances of the NFSv4.1 |
| 365 | * server." |
| 366 | */ |
| 367 | void nfsd_reset_write_verifier(struct nfsd_net *nn) |
| 368 | { |
| 369 | write_seqlock(&nn->writeverf_lock); |
| 370 | nfsd_reset_write_verifier_locked(nn); |
| 371 | write_sequnlock(&nn->writeverf_lock); |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * Crank up a set of per-namespace resources for a new NFSD instance, |
| 376 | * including lockd, a duplicate reply cache, an open file cache |
| 377 | * instance, and a cache of NFSv4 state objects. |
| 378 | */ |
| 379 | static int nfsd_startup_net(struct net *net, const struct cred *cred) |
| 380 | { |
| 381 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 382 | int ret; |
| 383 | |
| 384 | if (nn->nfsd_net_up) |
| 385 | return 0; |
| 386 | |
| 387 | ret = nfsd_startup_generic(); |
| 388 | if (ret) |
| 389 | return ret; |
| 390 | ret = nfsd_init_socks(net, cred); |
| 391 | if (ret) |
| 392 | goto out_socks; |
| 393 | |
| 394 | if (nfsd_needs_lockd(nn) && !nn->lockd_up) { |
| 395 | ret = lockd_up(net, cred); |
| 396 | if (ret) |
| 397 | goto out_socks; |
| 398 | nn->lockd_up = true; |
| 399 | } |
| 400 | |
| 401 | ret = nfsd_file_cache_start_net(net); |
| 402 | if (ret) |
| 403 | goto out_lockd; |
| 404 | |
| 405 | ret = nfsd_reply_cache_init(nn); |
| 406 | if (ret) |
| 407 | goto out_filecache; |
| 408 | |
| 409 | ret = nfs4_state_start_net(net); |
| 410 | if (ret) |
| 411 | goto out_reply_cache; |
| 412 | |
| 413 | #ifdef CONFIG_NFSD_V4_2_INTER_SSC |
| 414 | nfsd4_ssc_init_umount_work(nn); |
| 415 | #endif |
| 416 | nn->nfsd_net_up = true; |
| 417 | return 0; |
| 418 | |
| 419 | out_reply_cache: |
| 420 | nfsd_reply_cache_shutdown(nn); |
| 421 | out_filecache: |
| 422 | nfsd_file_cache_shutdown_net(net); |
| 423 | out_lockd: |
| 424 | if (nn->lockd_up) { |
| 425 | lockd_down(net); |
| 426 | nn->lockd_up = false; |
| 427 | } |
| 428 | out_socks: |
| 429 | nfsd_shutdown_generic(); |
| 430 | return ret; |
| 431 | } |
| 432 | |
| 433 | static void nfsd_shutdown_net(struct net *net) |
| 434 | { |
| 435 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 436 | |
| 437 | nfs4_state_shutdown_net(net); |
| 438 | nfsd_reply_cache_shutdown(nn); |
| 439 | nfsd_file_cache_shutdown_net(net); |
| 440 | if (nn->lockd_up) { |
| 441 | lockd_down(net); |
| 442 | nn->lockd_up = false; |
| 443 | } |
| 444 | percpu_ref_exit(&nn->nfsd_serv_ref); |
| 445 | nn->nfsd_net_up = false; |
| 446 | nfsd_shutdown_generic(); |
| 447 | } |
| 448 | |
| 449 | static DEFINE_SPINLOCK(nfsd_notifier_lock); |
| 450 | static int nfsd_inetaddr_event(struct notifier_block *this, unsigned long event, |
| 451 | void *ptr) |
| 452 | { |
| 453 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
| 454 | struct net_device *dev = ifa->ifa_dev->dev; |
| 455 | struct net *net = dev_net(dev); |
| 456 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 457 | struct sockaddr_in sin; |
| 458 | |
| 459 | if (event != NETDEV_DOWN || !nn->nfsd_serv) |
| 460 | goto out; |
| 461 | |
| 462 | spin_lock(&nfsd_notifier_lock); |
| 463 | if (nn->nfsd_serv) { |
| 464 | dprintk("nfsd_inetaddr_event: removed %pI4\n", &ifa->ifa_local); |
| 465 | sin.sin_family = AF_INET; |
| 466 | sin.sin_addr.s_addr = ifa->ifa_local; |
| 467 | svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin); |
| 468 | } |
| 469 | spin_unlock(&nfsd_notifier_lock); |
| 470 | |
| 471 | out: |
| 472 | return NOTIFY_DONE; |
| 473 | } |
| 474 | |
| 475 | static struct notifier_block nfsd_inetaddr_notifier = { |
| 476 | .notifier_call = nfsd_inetaddr_event, |
| 477 | }; |
| 478 | |
| 479 | #if IS_ENABLED(CONFIG_IPV6) |
| 480 | static int nfsd_inet6addr_event(struct notifier_block *this, |
| 481 | unsigned long event, void *ptr) |
| 482 | { |
| 483 | struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; |
| 484 | struct net_device *dev = ifa->idev->dev; |
| 485 | struct net *net = dev_net(dev); |
| 486 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 487 | struct sockaddr_in6 sin6; |
| 488 | |
| 489 | if (event != NETDEV_DOWN || !nn->nfsd_serv) |
| 490 | goto out; |
| 491 | |
| 492 | spin_lock(&nfsd_notifier_lock); |
| 493 | if (nn->nfsd_serv) { |
| 494 | dprintk("nfsd_inet6addr_event: removed %pI6\n", &ifa->addr); |
| 495 | sin6.sin6_family = AF_INET6; |
| 496 | sin6.sin6_addr = ifa->addr; |
| 497 | if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| 498 | sin6.sin6_scope_id = ifa->idev->dev->ifindex; |
| 499 | svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin6); |
| 500 | } |
| 501 | spin_unlock(&nfsd_notifier_lock); |
| 502 | |
| 503 | out: |
| 504 | return NOTIFY_DONE; |
| 505 | } |
| 506 | |
| 507 | static struct notifier_block nfsd_inet6addr_notifier = { |
| 508 | .notifier_call = nfsd_inet6addr_event, |
| 509 | }; |
| 510 | #endif |
| 511 | |
| 512 | /* Only used under nfsd_mutex, so this atomic may be overkill: */ |
| 513 | static atomic_t nfsd_notifier_refcount = ATOMIC_INIT(0); |
| 514 | |
| 515 | /** |
| 516 | * nfsd_destroy_serv - tear down NFSD's svc_serv for a namespace |
| 517 | * @net: network namespace the NFS service is associated with |
| 518 | */ |
| 519 | void nfsd_destroy_serv(struct net *net) |
| 520 | { |
| 521 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 522 | struct svc_serv *serv = nn->nfsd_serv; |
| 523 | |
| 524 | lockdep_assert_held(&nfsd_mutex); |
| 525 | |
| 526 | percpu_ref_kill_and_confirm(&nn->nfsd_serv_ref, nfsd_serv_done); |
| 527 | wait_for_completion(&nn->nfsd_serv_confirm_done); |
| 528 | wait_for_completion(&nn->nfsd_serv_free_done); |
| 529 | /* percpu_ref_exit is called in nfsd_shutdown_net */ |
| 530 | |
| 531 | spin_lock(&nfsd_notifier_lock); |
| 532 | nn->nfsd_serv = NULL; |
| 533 | spin_unlock(&nfsd_notifier_lock); |
| 534 | |
| 535 | /* check if the notifier still has clients */ |
| 536 | if (atomic_dec_return(&nfsd_notifier_refcount) == 0) { |
| 537 | unregister_inetaddr_notifier(&nfsd_inetaddr_notifier); |
| 538 | #if IS_ENABLED(CONFIG_IPV6) |
| 539 | unregister_inet6addr_notifier(&nfsd_inet6addr_notifier); |
| 540 | #endif |
| 541 | } |
| 542 | |
| 543 | svc_xprt_destroy_all(serv, net); |
| 544 | |
| 545 | /* |
| 546 | * write_ports can create the server without actually starting |
| 547 | * any threads--if we get shut down before any threads are |
| 548 | * started, then nfsd_destroy_serv will be run before any of this |
| 549 | * other initialization has been done except the rpcb information. |
| 550 | */ |
| 551 | svc_rpcb_cleanup(serv, net); |
| 552 | if (!nn->nfsd_net_up) |
| 553 | return; |
| 554 | |
| 555 | nfsd_shutdown_net(net); |
| 556 | nfsd_export_flush(net); |
| 557 | svc_destroy(&serv); |
| 558 | } |
| 559 | |
| 560 | void nfsd_reset_versions(struct nfsd_net *nn) |
| 561 | { |
| 562 | int i; |
| 563 | |
| 564 | for (i = 0; i <= NFSD_MAXVERS; i++) |
| 565 | if (nfsd_vers(nn, i, NFSD_TEST)) |
| 566 | return; |
| 567 | |
| 568 | for (i = 0; i <= NFSD_MAXVERS; i++) |
| 569 | if (i != 4) |
| 570 | nfsd_vers(nn, i, NFSD_SET); |
| 571 | else { |
| 572 | int minor = 0; |
| 573 | while (nfsd_minorversion(nn, minor, NFSD_SET) >= 0) |
| 574 | minor++; |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | /* |
| 579 | * Each session guarantees a negotiated per slot memory cache for replies |
| 580 | * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated |
| 581 | * NFSv4.1 server might want to use more memory for a DRC than a machine |
| 582 | * with mutiple services. |
| 583 | * |
| 584 | * Impose a hard limit on the number of pages for the DRC which varies |
| 585 | * according to the machines free pages. This is of course only a default. |
| 586 | * |
| 587 | * For now this is a #defined shift which could be under admin control |
| 588 | * in the future. |
| 589 | */ |
| 590 | static void set_max_drc(void) |
| 591 | { |
| 592 | #define NFSD_DRC_SIZE_SHIFT 7 |
| 593 | nfsd_drc_max_mem = (nr_free_buffer_pages() |
| 594 | >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; |
| 595 | nfsd_drc_mem_used = 0; |
| 596 | dprintk("%s nfsd_drc_max_mem %lu \n", __func__, nfsd_drc_max_mem); |
| 597 | } |
| 598 | |
| 599 | static int nfsd_get_default_max_blksize(void) |
| 600 | { |
| 601 | struct sysinfo i; |
| 602 | unsigned long long target; |
| 603 | unsigned long ret; |
| 604 | |
| 605 | si_meminfo(&i); |
| 606 | target = (i.totalram - i.totalhigh) << PAGE_SHIFT; |
| 607 | /* |
| 608 | * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig |
| 609 | * machines, but only uses 32K on 128M machines. Bottom out at |
| 610 | * 8K on 32M and smaller. Of course, this is only a default. |
| 611 | */ |
| 612 | target >>= 12; |
| 613 | |
| 614 | ret = NFSSVC_MAXBLKSIZE; |
| 615 | while (ret > target && ret >= 8*1024*2) |
| 616 | ret /= 2; |
| 617 | return ret; |
| 618 | } |
| 619 | |
| 620 | void nfsd_shutdown_threads(struct net *net) |
| 621 | { |
| 622 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 623 | struct svc_serv *serv; |
| 624 | |
| 625 | mutex_lock(&nfsd_mutex); |
| 626 | serv = nn->nfsd_serv; |
| 627 | if (serv == NULL) { |
| 628 | mutex_unlock(&nfsd_mutex); |
| 629 | return; |
| 630 | } |
| 631 | |
| 632 | /* Kill outstanding nfsd threads */ |
| 633 | svc_set_num_threads(serv, NULL, 0); |
| 634 | nfsd_destroy_serv(net); |
| 635 | mutex_unlock(&nfsd_mutex); |
| 636 | } |
| 637 | |
| 638 | struct svc_rqst *nfsd_current_rqst(void) |
| 639 | { |
| 640 | if (kthread_func(current) == nfsd) |
| 641 | return kthread_data(current); |
| 642 | return NULL; |
| 643 | } |
| 644 | |
| 645 | int nfsd_create_serv(struct net *net) |
| 646 | { |
| 647 | int error; |
| 648 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 649 | struct svc_serv *serv; |
| 650 | |
| 651 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
| 652 | if (nn->nfsd_serv) |
| 653 | return 0; |
| 654 | |
| 655 | error = percpu_ref_init(&nn->nfsd_serv_ref, nfsd_serv_free, |
| 656 | 0, GFP_KERNEL); |
| 657 | if (error) |
| 658 | return error; |
| 659 | init_completion(&nn->nfsd_serv_free_done); |
| 660 | init_completion(&nn->nfsd_serv_confirm_done); |
| 661 | |
| 662 | if (nfsd_max_blksize == 0) |
| 663 | nfsd_max_blksize = nfsd_get_default_max_blksize(); |
| 664 | nfsd_reset_versions(nn); |
| 665 | serv = svc_create_pooled(nfsd_programs, ARRAY_SIZE(nfsd_programs), |
| 666 | &nn->nfsd_svcstats, |
| 667 | nfsd_max_blksize, nfsd); |
| 668 | if (serv == NULL) |
| 669 | return -ENOMEM; |
| 670 | |
| 671 | serv->sv_maxconn = nn->max_connections; |
| 672 | error = svc_bind(serv, net); |
| 673 | if (error < 0) { |
| 674 | svc_destroy(&serv); |
| 675 | return error; |
| 676 | } |
| 677 | spin_lock(&nfsd_notifier_lock); |
| 678 | nn->nfsd_serv = serv; |
| 679 | spin_unlock(&nfsd_notifier_lock); |
| 680 | |
| 681 | set_max_drc(); |
| 682 | /* check if the notifier is already set */ |
| 683 | if (atomic_inc_return(&nfsd_notifier_refcount) == 1) { |
| 684 | register_inetaddr_notifier(&nfsd_inetaddr_notifier); |
| 685 | #if IS_ENABLED(CONFIG_IPV6) |
| 686 | register_inet6addr_notifier(&nfsd_inet6addr_notifier); |
| 687 | #endif |
| 688 | } |
| 689 | nfsd_reset_write_verifier(nn); |
| 690 | return 0; |
| 691 | } |
| 692 | |
| 693 | int nfsd_nrpools(struct net *net) |
| 694 | { |
| 695 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 696 | |
| 697 | if (nn->nfsd_serv == NULL) |
| 698 | return 0; |
| 699 | else |
| 700 | return nn->nfsd_serv->sv_nrpools; |
| 701 | } |
| 702 | |
| 703 | int nfsd_get_nrthreads(int n, int *nthreads, struct net *net) |
| 704 | { |
| 705 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 706 | struct svc_serv *serv = nn->nfsd_serv; |
| 707 | int i; |
| 708 | |
| 709 | if (serv) |
| 710 | for (i = 0; i < serv->sv_nrpools && i < n; i++) |
| 711 | nthreads[i] = serv->sv_pools[i].sp_nrthreads; |
| 712 | return 0; |
| 713 | } |
| 714 | |
| 715 | /** |
| 716 | * nfsd_set_nrthreads - set the number of running threads in the net's service |
| 717 | * @n: number of array members in @nthreads |
| 718 | * @nthreads: array of thread counts for each pool |
| 719 | * @net: network namespace to operate within |
| 720 | * |
| 721 | * This function alters the number of running threads for the given network |
| 722 | * namespace in each pool. If passed an array longer then the number of pools |
| 723 | * the extra pool settings are ignored. If passed an array shorter than the |
| 724 | * number of pools, the missing values are interpreted as 0's. |
| 725 | * |
| 726 | * Returns 0 on success or a negative errno on error. |
| 727 | */ |
| 728 | int nfsd_set_nrthreads(int n, int *nthreads, struct net *net) |
| 729 | { |
| 730 | int i = 0; |
| 731 | int tot = 0; |
| 732 | int err = 0; |
| 733 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 734 | |
| 735 | lockdep_assert_held(&nfsd_mutex); |
| 736 | |
| 737 | if (nn->nfsd_serv == NULL || n <= 0) |
| 738 | return 0; |
| 739 | |
| 740 | /* |
| 741 | * Special case: When n == 1, pass in NULL for the pool, so that the |
| 742 | * change is distributed equally among them. |
| 743 | */ |
| 744 | if (n == 1) |
| 745 | return svc_set_num_threads(nn->nfsd_serv, NULL, nthreads[0]); |
| 746 | |
| 747 | if (n > nn->nfsd_serv->sv_nrpools) |
| 748 | n = nn->nfsd_serv->sv_nrpools; |
| 749 | |
| 750 | /* enforce a global maximum number of threads */ |
| 751 | tot = 0; |
| 752 | for (i = 0; i < n; i++) { |
| 753 | nthreads[i] = min(nthreads[i], NFSD_MAXSERVS); |
| 754 | tot += nthreads[i]; |
| 755 | } |
| 756 | if (tot > NFSD_MAXSERVS) { |
| 757 | /* total too large: scale down requested numbers */ |
| 758 | for (i = 0; i < n && tot > 0; i++) { |
| 759 | int new = nthreads[i] * NFSD_MAXSERVS / tot; |
| 760 | tot -= (nthreads[i] - new); |
| 761 | nthreads[i] = new; |
| 762 | } |
| 763 | for (i = 0; i < n && tot > 0; i++) { |
| 764 | nthreads[i]--; |
| 765 | tot--; |
| 766 | } |
| 767 | } |
| 768 | |
| 769 | /* apply the new numbers */ |
| 770 | for (i = 0; i < n; i++) { |
| 771 | err = svc_set_num_threads(nn->nfsd_serv, |
| 772 | &nn->nfsd_serv->sv_pools[i], |
| 773 | nthreads[i]); |
| 774 | if (err) |
| 775 | goto out; |
| 776 | } |
| 777 | |
| 778 | /* Anything undefined in array is considered to be 0 */ |
| 779 | for (i = n; i < nn->nfsd_serv->sv_nrpools; ++i) { |
| 780 | err = svc_set_num_threads(nn->nfsd_serv, |
| 781 | &nn->nfsd_serv->sv_pools[i], |
| 782 | 0); |
| 783 | if (err) |
| 784 | goto out; |
| 785 | } |
| 786 | out: |
| 787 | return err; |
| 788 | } |
| 789 | |
| 790 | /** |
| 791 | * nfsd_svc: start up or shut down the nfsd server |
| 792 | * @n: number of array members in @nthreads |
| 793 | * @nthreads: array of thread counts for each pool |
| 794 | * @net: network namespace to operate within |
| 795 | * @cred: credentials to use for xprt creation |
| 796 | * @scope: server scope value (defaults to nodename) |
| 797 | * |
| 798 | * Adjust the number of threads in each pool and return the new |
| 799 | * total number of threads in the service. |
| 800 | */ |
| 801 | int |
| 802 | nfsd_svc(int n, int *nthreads, struct net *net, const struct cred *cred, const char *scope) |
| 803 | { |
| 804 | int error; |
| 805 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 806 | struct svc_serv *serv; |
| 807 | |
| 808 | lockdep_assert_held(&nfsd_mutex); |
| 809 | |
| 810 | dprintk("nfsd: creating service\n"); |
| 811 | |
| 812 | strscpy(nn->nfsd_name, scope ? scope : utsname()->nodename, |
| 813 | sizeof(nn->nfsd_name)); |
| 814 | |
| 815 | error = nfsd_create_serv(net); |
| 816 | if (error) |
| 817 | goto out; |
| 818 | serv = nn->nfsd_serv; |
| 819 | |
| 820 | error = nfsd_startup_net(net, cred); |
| 821 | if (error) |
| 822 | goto out_put; |
| 823 | error = nfsd_set_nrthreads(n, nthreads, net); |
| 824 | if (error) |
| 825 | goto out_put; |
| 826 | error = serv->sv_nrthreads; |
| 827 | out_put: |
| 828 | if (serv->sv_nrthreads == 0) |
| 829 | nfsd_destroy_serv(net); |
| 830 | out: |
| 831 | return error; |
| 832 | } |
| 833 | |
| 834 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 835 | static bool |
| 836 | nfsd_support_acl_version(int vers) |
| 837 | { |
| 838 | if (vers >= NFSD_ACL_MINVERS && vers < NFSD_ACL_NRVERS) |
| 839 | return nfsd_acl_version[vers] != NULL; |
| 840 | return false; |
| 841 | } |
| 842 | |
| 843 | static int |
| 844 | nfsd_acl_rpcbind_set(struct net *net, const struct svc_program *progp, |
| 845 | u32 version, int family, unsigned short proto, |
| 846 | unsigned short port) |
| 847 | { |
| 848 | if (!nfsd_support_acl_version(version) || |
| 849 | !nfsd_vers(net_generic(net, nfsd_net_id), version, NFSD_TEST)) |
| 850 | return 0; |
| 851 | return svc_generic_rpcbind_set(net, progp, version, family, |
| 852 | proto, port); |
| 853 | } |
| 854 | |
| 855 | static __be32 |
| 856 | nfsd_acl_init_request(struct svc_rqst *rqstp, |
| 857 | const struct svc_program *progp, |
| 858 | struct svc_process_info *ret) |
| 859 | { |
| 860 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
| 861 | int i; |
| 862 | |
| 863 | if (likely(nfsd_support_acl_version(rqstp->rq_vers) && |
| 864 | nfsd_vers(nn, rqstp->rq_vers, NFSD_TEST))) |
| 865 | return svc_generic_init_request(rqstp, progp, ret); |
| 866 | |
| 867 | ret->mismatch.lovers = NFSD_ACL_NRVERS; |
| 868 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) { |
| 869 | if (nfsd_support_acl_version(rqstp->rq_vers) && |
| 870 | nfsd_vers(nn, i, NFSD_TEST)) { |
| 871 | ret->mismatch.lovers = i; |
| 872 | break; |
| 873 | } |
| 874 | } |
| 875 | if (ret->mismatch.lovers == NFSD_ACL_NRVERS) |
| 876 | return rpc_prog_unavail; |
| 877 | ret->mismatch.hivers = NFSD_ACL_MINVERS; |
| 878 | for (i = NFSD_ACL_NRVERS - 1; i >= NFSD_ACL_MINVERS; i--) { |
| 879 | if (nfsd_support_acl_version(rqstp->rq_vers) && |
| 880 | nfsd_vers(nn, i, NFSD_TEST)) { |
| 881 | ret->mismatch.hivers = i; |
| 882 | break; |
| 883 | } |
| 884 | } |
| 885 | return rpc_prog_mismatch; |
| 886 | } |
| 887 | #endif |
| 888 | |
| 889 | static int |
| 890 | nfsd_rpcbind_set(struct net *net, const struct svc_program *progp, |
| 891 | u32 version, int family, unsigned short proto, |
| 892 | unsigned short port) |
| 893 | { |
| 894 | if (!nfsd_vers(net_generic(net, nfsd_net_id), version, NFSD_TEST)) |
| 895 | return 0; |
| 896 | return svc_generic_rpcbind_set(net, progp, version, family, |
| 897 | proto, port); |
| 898 | } |
| 899 | |
| 900 | static __be32 |
| 901 | nfsd_init_request(struct svc_rqst *rqstp, |
| 902 | const struct svc_program *progp, |
| 903 | struct svc_process_info *ret) |
| 904 | { |
| 905 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
| 906 | int i; |
| 907 | |
| 908 | if (likely(nfsd_vers(nn, rqstp->rq_vers, NFSD_TEST))) |
| 909 | return svc_generic_init_request(rqstp, progp, ret); |
| 910 | |
| 911 | ret->mismatch.lovers = NFSD_MAXVERS + 1; |
| 912 | for (i = NFSD_MINVERS; i <= NFSD_MAXVERS; i++) { |
| 913 | if (nfsd_vers(nn, i, NFSD_TEST)) { |
| 914 | ret->mismatch.lovers = i; |
| 915 | break; |
| 916 | } |
| 917 | } |
| 918 | if (ret->mismatch.lovers > NFSD_MAXVERS) |
| 919 | return rpc_prog_unavail; |
| 920 | ret->mismatch.hivers = NFSD_MINVERS; |
| 921 | for (i = NFSD_MAXVERS; i >= NFSD_MINVERS; i--) { |
| 922 | if (nfsd_vers(nn, i, NFSD_TEST)) { |
| 923 | ret->mismatch.hivers = i; |
| 924 | break; |
| 925 | } |
| 926 | } |
| 927 | return rpc_prog_mismatch; |
| 928 | } |
| 929 | |
| 930 | /* |
| 931 | * This is the NFS server kernel thread |
| 932 | */ |
| 933 | static int |
| 934 | nfsd(void *vrqstp) |
| 935 | { |
| 936 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
| 937 | struct svc_xprt *perm_sock = list_entry(rqstp->rq_server->sv_permsocks.next, typeof(struct svc_xprt), xpt_list); |
| 938 | struct net *net = perm_sock->xpt_net; |
| 939 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 940 | |
| 941 | /* At this point, the thread shares current->fs |
| 942 | * with the init process. We need to create files with the |
| 943 | * umask as defined by the client instead of init's umask. |
| 944 | */ |
| 945 | svc_thread_init_status(rqstp, unshare_fs_struct()); |
| 946 | |
| 947 | current->fs->umask = 0; |
| 948 | |
| 949 | atomic_inc(&nfsd_th_cnt); |
| 950 | |
| 951 | set_freezable(); |
| 952 | |
| 953 | /* |
| 954 | * The main request loop |
| 955 | */ |
| 956 | while (!svc_thread_should_stop(rqstp)) { |
| 957 | /* Update sv_maxconn if it has changed */ |
| 958 | rqstp->rq_server->sv_maxconn = nn->max_connections; |
| 959 | |
| 960 | svc_recv(rqstp); |
| 961 | |
| 962 | nfsd_file_net_dispose(nn); |
| 963 | } |
| 964 | |
| 965 | atomic_dec(&nfsd_th_cnt); |
| 966 | |
| 967 | /* Release the thread */ |
| 968 | svc_exit_thread(rqstp); |
| 969 | return 0; |
| 970 | } |
| 971 | |
| 972 | /** |
| 973 | * nfsd_dispatch - Process an NFS or NFSACL or LOCALIO Request |
| 974 | * @rqstp: incoming request |
| 975 | * |
| 976 | * This RPC dispatcher integrates the NFS server's duplicate reply cache. |
| 977 | * |
| 978 | * Return values: |
| 979 | * %0: Processing complete; do not send a Reply |
| 980 | * %1: Processing complete; send Reply in rqstp->rq_res |
| 981 | */ |
| 982 | int nfsd_dispatch(struct svc_rqst *rqstp) |
| 983 | { |
| 984 | const struct svc_procedure *proc = rqstp->rq_procinfo; |
| 985 | __be32 *statp = rqstp->rq_accept_statp; |
| 986 | struct nfsd_cacherep *rp; |
| 987 | unsigned int start, len; |
| 988 | __be32 *nfs_reply; |
| 989 | |
| 990 | /* |
| 991 | * Give the xdr decoder a chance to change this if it wants |
| 992 | * (necessary in the NFSv4.0 compound case) |
| 993 | */ |
| 994 | rqstp->rq_cachetype = proc->pc_cachetype; |
| 995 | |
| 996 | /* |
| 997 | * ->pc_decode advances the argument stream past the NFS |
| 998 | * Call header, so grab the header's starting location and |
| 999 | * size now for the call to nfsd_cache_lookup(). |
| 1000 | */ |
| 1001 | start = xdr_stream_pos(&rqstp->rq_arg_stream); |
| 1002 | len = xdr_stream_remaining(&rqstp->rq_arg_stream); |
| 1003 | if (!proc->pc_decode(rqstp, &rqstp->rq_arg_stream)) |
| 1004 | goto out_decode_err; |
| 1005 | |
| 1006 | /* |
| 1007 | * Release rq_status_counter setting it to an odd value after the rpc |
| 1008 | * request has been properly parsed. rq_status_counter is used to |
| 1009 | * notify the consumers if the rqstp fields are stable |
| 1010 | * (rq_status_counter is odd) or not meaningful (rq_status_counter |
| 1011 | * is even). |
| 1012 | */ |
| 1013 | smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter | 1); |
| 1014 | |
| 1015 | rp = NULL; |
| 1016 | switch (nfsd_cache_lookup(rqstp, start, len, &rp)) { |
| 1017 | case RC_DOIT: |
| 1018 | break; |
| 1019 | case RC_REPLY: |
| 1020 | goto out_cached_reply; |
| 1021 | case RC_DROPIT: |
| 1022 | goto out_dropit; |
| 1023 | } |
| 1024 | |
| 1025 | nfs_reply = xdr_inline_decode(&rqstp->rq_res_stream, 0); |
| 1026 | *statp = proc->pc_func(rqstp); |
| 1027 | if (test_bit(RQ_DROPME, &rqstp->rq_flags)) |
| 1028 | goto out_update_drop; |
| 1029 | |
| 1030 | if (!proc->pc_encode(rqstp, &rqstp->rq_res_stream)) |
| 1031 | goto out_encode_err; |
| 1032 | |
| 1033 | /* |
| 1034 | * Release rq_status_counter setting it to an even value after the rpc |
| 1035 | * request has been properly processed. |
| 1036 | */ |
| 1037 | smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter + 1); |
| 1038 | |
| 1039 | nfsd_cache_update(rqstp, rp, rqstp->rq_cachetype, nfs_reply); |
| 1040 | out_cached_reply: |
| 1041 | return 1; |
| 1042 | |
| 1043 | out_decode_err: |
| 1044 | trace_nfsd_garbage_args_err(rqstp); |
| 1045 | *statp = rpc_garbage_args; |
| 1046 | return 1; |
| 1047 | |
| 1048 | out_update_drop: |
| 1049 | nfsd_cache_update(rqstp, rp, RC_NOCACHE, NULL); |
| 1050 | out_dropit: |
| 1051 | return 0; |
| 1052 | |
| 1053 | out_encode_err: |
| 1054 | trace_nfsd_cant_encode_err(rqstp); |
| 1055 | nfsd_cache_update(rqstp, rp, RC_NOCACHE, NULL); |
| 1056 | *statp = rpc_system_err; |
| 1057 | return 1; |
| 1058 | } |
| 1059 | |
| 1060 | /** |
| 1061 | * nfssvc_decode_voidarg - Decode void arguments |
| 1062 | * @rqstp: Server RPC transaction context |
| 1063 | * @xdr: XDR stream positioned at arguments to decode |
| 1064 | * |
| 1065 | * Return values: |
| 1066 | * %false: Arguments were not valid |
| 1067 | * %true: Decoding was successful |
| 1068 | */ |
| 1069 | bool nfssvc_decode_voidarg(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| 1070 | { |
| 1071 | return true; |
| 1072 | } |
| 1073 | |
| 1074 | /** |
| 1075 | * nfssvc_encode_voidres - Encode void results |
| 1076 | * @rqstp: Server RPC transaction context |
| 1077 | * @xdr: XDR stream into which to encode results |
| 1078 | * |
| 1079 | * Return values: |
| 1080 | * %false: Local error while encoding |
| 1081 | * %true: Encoding was successful |
| 1082 | */ |
| 1083 | bool nfssvc_encode_voidres(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| 1084 | { |
| 1085 | return true; |
| 1086 | } |