Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/lockd/clntxdr.c |
| 3 | * |
| 4 | * XDR functions to encode/decode NLM version 3 RPC arguments and results. |
| 5 | * NLM version 3 is backwards compatible with NLM versions 1 and 2. |
| 6 | * |
| 7 | * NLM client-side only. |
| 8 | * |
| 9 | * Copyright (C) 2010, Oracle. All rights reserved. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/sunrpc/xdr.h> |
| 14 | #include <linux/sunrpc/clnt.h> |
| 15 | #include <linux/sunrpc/stats.h> |
| 16 | #include <linux/lockd/lockd.h> |
| 17 | |
| 18 | #define NLMDBG_FACILITY NLMDBG_XDR |
| 19 | |
| 20 | #if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ) |
| 21 | # error "NLM host name cannot be larger than XDR_MAX_NETOBJ!" |
| 22 | #endif |
| 23 | |
| 24 | /* |
| 25 | * Declare the space requirements for NLM arguments and replies as |
| 26 | * number of 32bit-words |
| 27 | */ |
| 28 | #define NLM_cookie_sz (1+(NLM_MAXCOOKIELEN>>2)) |
| 29 | #define NLM_caller_sz (1+(NLMCLNT_OHSIZE>>2)) |
| 30 | #define NLM_owner_sz (1+(NLMCLNT_OHSIZE>>2)) |
| 31 | #define NLM_fhandle_sz (1+(NFS2_FHSIZE>>2)) |
| 32 | #define NLM_lock_sz (3+NLM_caller_sz+NLM_owner_sz+NLM_fhandle_sz) |
| 33 | #define NLM_holder_sz (4+NLM_owner_sz) |
| 34 | |
| 35 | #define NLM_testargs_sz (NLM_cookie_sz+1+NLM_lock_sz) |
| 36 | #define NLM_lockargs_sz (NLM_cookie_sz+4+NLM_lock_sz) |
| 37 | #define NLM_cancargs_sz (NLM_cookie_sz+2+NLM_lock_sz) |
| 38 | #define NLM_unlockargs_sz (NLM_cookie_sz+NLM_lock_sz) |
| 39 | |
| 40 | #define NLM_testres_sz (NLM_cookie_sz+1+NLM_holder_sz) |
| 41 | #define NLM_res_sz (NLM_cookie_sz+1) |
| 42 | #define NLM_norep_sz (0) |
| 43 | |
| 44 | |
| 45 | static s32 loff_t_to_s32(loff_t offset) |
| 46 | { |
| 47 | s32 res; |
| 48 | |
| 49 | if (offset >= NLM_OFFSET_MAX) |
| 50 | res = NLM_OFFSET_MAX; |
| 51 | else if (offset <= -NLM_OFFSET_MAX) |
| 52 | res = -NLM_OFFSET_MAX; |
| 53 | else |
| 54 | res = offset; |
| 55 | return res; |
| 56 | } |
| 57 | |
| 58 | static void nlm_compute_offsets(const struct nlm_lock *lock, |
| 59 | u32 *l_offset, u32 *l_len) |
| 60 | { |
| 61 | const struct file_lock *fl = &lock->fl; |
| 62 | |
| 63 | BUG_ON(fl->fl_start > NLM_OFFSET_MAX); |
| 64 | BUG_ON(fl->fl_end > NLM_OFFSET_MAX && |
| 65 | fl->fl_end != OFFSET_MAX); |
| 66 | |
| 67 | *l_offset = loff_t_to_s32(fl->fl_start); |
| 68 | if (fl->fl_end == OFFSET_MAX) |
| 69 | *l_len = 0; |
| 70 | else |
| 71 | *l_len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1); |
| 72 | } |
| 73 | |
| 74 | /* |
| 75 | * Handle decode buffer overflows out-of-line. |
| 76 | */ |
| 77 | static void print_overflow_msg(const char *func, const struct xdr_stream *xdr) |
| 78 | { |
| 79 | dprintk("lockd: %s prematurely hit the end of our receive buffer. " |
| 80 | "Remaining buffer length is %tu words.\n", |
| 81 | func, xdr->end - xdr->p); |
| 82 | } |
| 83 | |
| 84 | |
| 85 | /* |
| 86 | * Encode/decode NLMv3 basic data types |
| 87 | * |
| 88 | * Basic NLMv3 data types are not defined in an IETF standards |
| 89 | * document. X/Open has a description of these data types that |
| 90 | * is useful. See Chapter 10 of "Protocols for Interworking: |
| 91 | * XNFS, Version 3W". |
| 92 | * |
| 93 | * Not all basic data types have their own encoding and decoding |
| 94 | * functions. For run-time efficiency, some data types are encoded |
| 95 | * or decoded inline. |
| 96 | */ |
| 97 | |
| 98 | static void encode_bool(struct xdr_stream *xdr, const int value) |
| 99 | { |
| 100 | __be32 *p; |
| 101 | |
| 102 | p = xdr_reserve_space(xdr, 4); |
| 103 | *p = value ? xdr_one : xdr_zero; |
| 104 | } |
| 105 | |
| 106 | static void encode_int32(struct xdr_stream *xdr, const s32 value) |
| 107 | { |
| 108 | __be32 *p; |
| 109 | |
| 110 | p = xdr_reserve_space(xdr, 4); |
| 111 | *p = cpu_to_be32(value); |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * typedef opaque netobj<MAXNETOBJ_SZ> |
| 116 | */ |
| 117 | static void encode_netobj(struct xdr_stream *xdr, |
| 118 | const u8 *data, const unsigned int length) |
| 119 | { |
| 120 | __be32 *p; |
| 121 | |
| 122 | BUG_ON(length > XDR_MAX_NETOBJ); |
| 123 | p = xdr_reserve_space(xdr, 4 + length); |
| 124 | xdr_encode_opaque(p, data, length); |
| 125 | } |
| 126 | |
| 127 | static int decode_netobj(struct xdr_stream *xdr, |
| 128 | struct xdr_netobj *obj) |
| 129 | { |
| 130 | u32 length; |
| 131 | __be32 *p; |
| 132 | |
| 133 | p = xdr_inline_decode(xdr, 4); |
| 134 | if (unlikely(p == NULL)) |
| 135 | goto out_overflow; |
| 136 | length = be32_to_cpup(p++); |
| 137 | if (unlikely(length > XDR_MAX_NETOBJ)) |
| 138 | goto out_size; |
| 139 | obj->len = length; |
| 140 | obj->data = (u8 *)p; |
| 141 | return 0; |
| 142 | out_size: |
| 143 | dprintk("NFS: returned netobj was too long: %u\n", length); |
| 144 | return -EIO; |
| 145 | out_overflow: |
| 146 | print_overflow_msg(__func__, xdr); |
| 147 | return -EIO; |
| 148 | } |
| 149 | |
| 150 | /* |
| 151 | * netobj cookie; |
| 152 | */ |
| 153 | static void encode_cookie(struct xdr_stream *xdr, |
| 154 | const struct nlm_cookie *cookie) |
| 155 | { |
| 156 | BUG_ON(cookie->len > NLM_MAXCOOKIELEN); |
| 157 | encode_netobj(xdr, (u8 *)&cookie->data, cookie->len); |
| 158 | } |
| 159 | |
| 160 | static int decode_cookie(struct xdr_stream *xdr, |
| 161 | struct nlm_cookie *cookie) |
| 162 | { |
| 163 | u32 length; |
| 164 | __be32 *p; |
| 165 | |
| 166 | p = xdr_inline_decode(xdr, 4); |
| 167 | if (unlikely(p == NULL)) |
| 168 | goto out_overflow; |
| 169 | length = be32_to_cpup(p++); |
| 170 | /* apparently HPUX can return empty cookies */ |
| 171 | if (length == 0) |
| 172 | goto out_hpux; |
| 173 | if (length > NLM_MAXCOOKIELEN) |
| 174 | goto out_size; |
| 175 | p = xdr_inline_decode(xdr, length); |
| 176 | if (unlikely(p == NULL)) |
| 177 | goto out_overflow; |
| 178 | cookie->len = length; |
| 179 | memcpy(cookie->data, p, length); |
| 180 | return 0; |
| 181 | out_hpux: |
| 182 | cookie->len = 4; |
| 183 | memset(cookie->data, 0, 4); |
| 184 | return 0; |
| 185 | out_size: |
| 186 | dprintk("NFS: returned cookie was too long: %u\n", length); |
| 187 | return -EIO; |
| 188 | out_overflow: |
| 189 | print_overflow_msg(__func__, xdr); |
| 190 | return -EIO; |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * netobj fh; |
| 195 | */ |
| 196 | static void encode_fh(struct xdr_stream *xdr, const struct nfs_fh *fh) |
| 197 | { |
| 198 | BUG_ON(fh->size != NFS2_FHSIZE); |
| 199 | encode_netobj(xdr, (u8 *)&fh->data, NFS2_FHSIZE); |
| 200 | } |
| 201 | |
| 202 | /* |
| 203 | * enum nlm_stats { |
| 204 | * LCK_GRANTED = 0, |
| 205 | * LCK_DENIED = 1, |
| 206 | * LCK_DENIED_NOLOCKS = 2, |
| 207 | * LCK_BLOCKED = 3, |
| 208 | * LCK_DENIED_GRACE_PERIOD = 4 |
| 209 | * }; |
| 210 | * |
| 211 | * |
| 212 | * struct nlm_stat { |
| 213 | * nlm_stats stat; |
| 214 | * }; |
| 215 | * |
| 216 | * NB: we don't swap bytes for the NLM status values. The upper |
| 217 | * layers deal directly with the status value in network byte |
| 218 | * order. |
| 219 | */ |
| 220 | |
| 221 | static void encode_nlm_stat(struct xdr_stream *xdr, |
| 222 | const __be32 stat) |
| 223 | { |
| 224 | __be32 *p; |
| 225 | |
| 226 | BUG_ON(be32_to_cpu(stat) > NLM_LCK_DENIED_GRACE_PERIOD); |
| 227 | p = xdr_reserve_space(xdr, 4); |
| 228 | *p = stat; |
| 229 | } |
| 230 | |
| 231 | static int decode_nlm_stat(struct xdr_stream *xdr, |
| 232 | __be32 *stat) |
| 233 | { |
| 234 | __be32 *p; |
| 235 | |
| 236 | p = xdr_inline_decode(xdr, 4); |
| 237 | if (unlikely(p == NULL)) |
| 238 | goto out_overflow; |
| 239 | if (unlikely(*p > nlm_lck_denied_grace_period)) |
| 240 | goto out_enum; |
| 241 | *stat = *p; |
| 242 | return 0; |
| 243 | out_enum: |
| 244 | dprintk("%s: server returned invalid nlm_stats value: %u\n", |
| 245 | __func__, be32_to_cpup(p)); |
| 246 | return -EIO; |
| 247 | out_overflow: |
| 248 | print_overflow_msg(__func__, xdr); |
| 249 | return -EIO; |
| 250 | } |
| 251 | |
| 252 | /* |
| 253 | * struct nlm_holder { |
| 254 | * bool exclusive; |
| 255 | * int uppid; |
| 256 | * netobj oh; |
| 257 | * unsigned l_offset; |
| 258 | * unsigned l_len; |
| 259 | * }; |
| 260 | */ |
| 261 | static void encode_nlm_holder(struct xdr_stream *xdr, |
| 262 | const struct nlm_res *result) |
| 263 | { |
| 264 | const struct nlm_lock *lock = &result->lock; |
| 265 | u32 l_offset, l_len; |
| 266 | __be32 *p; |
| 267 | |
| 268 | encode_bool(xdr, lock->fl.fl_type == F_RDLCK); |
| 269 | encode_int32(xdr, lock->svid); |
| 270 | encode_netobj(xdr, lock->oh.data, lock->oh.len); |
| 271 | |
| 272 | p = xdr_reserve_space(xdr, 4 + 4); |
| 273 | nlm_compute_offsets(lock, &l_offset, &l_len); |
| 274 | *p++ = cpu_to_be32(l_offset); |
| 275 | *p = cpu_to_be32(l_len); |
| 276 | } |
| 277 | |
| 278 | static int decode_nlm_holder(struct xdr_stream *xdr, struct nlm_res *result) |
| 279 | { |
| 280 | struct nlm_lock *lock = &result->lock; |
| 281 | struct file_lock *fl = &lock->fl; |
| 282 | u32 exclusive, l_offset, l_len; |
| 283 | int error; |
| 284 | __be32 *p; |
| 285 | s32 end; |
| 286 | |
| 287 | memset(lock, 0, sizeof(*lock)); |
| 288 | locks_init_lock(fl); |
| 289 | |
| 290 | p = xdr_inline_decode(xdr, 4 + 4); |
| 291 | if (unlikely(p == NULL)) |
| 292 | goto out_overflow; |
| 293 | exclusive = be32_to_cpup(p++); |
| 294 | lock->svid = be32_to_cpup(p); |
| 295 | fl->fl_pid = (pid_t)lock->svid; |
| 296 | |
| 297 | error = decode_netobj(xdr, &lock->oh); |
| 298 | if (unlikely(error)) |
| 299 | goto out; |
| 300 | |
| 301 | p = xdr_inline_decode(xdr, 4 + 4); |
| 302 | if (unlikely(p == NULL)) |
| 303 | goto out_overflow; |
| 304 | |
| 305 | fl->fl_flags = FL_POSIX; |
| 306 | fl->fl_type = exclusive != 0 ? F_WRLCK : F_RDLCK; |
| 307 | l_offset = be32_to_cpup(p++); |
| 308 | l_len = be32_to_cpup(p); |
| 309 | end = l_offset + l_len - 1; |
| 310 | |
| 311 | fl->fl_start = (loff_t)l_offset; |
| 312 | if (l_len == 0 || end < 0) |
| 313 | fl->fl_end = OFFSET_MAX; |
| 314 | else |
| 315 | fl->fl_end = (loff_t)end; |
| 316 | error = 0; |
| 317 | out: |
| 318 | return error; |
| 319 | out_overflow: |
| 320 | print_overflow_msg(__func__, xdr); |
| 321 | return -EIO; |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * string caller_name<LM_MAXSTRLEN>; |
| 326 | */ |
| 327 | static void encode_caller_name(struct xdr_stream *xdr, const char *name) |
| 328 | { |
| 329 | /* NB: client-side does not set lock->len */ |
| 330 | u32 length = strlen(name); |
| 331 | __be32 *p; |
| 332 | |
| 333 | BUG_ON(length > NLM_MAXSTRLEN); |
| 334 | p = xdr_reserve_space(xdr, 4 + length); |
| 335 | xdr_encode_opaque(p, name, length); |
| 336 | } |
| 337 | |
| 338 | /* |
| 339 | * struct nlm_lock { |
| 340 | * string caller_name<LM_MAXSTRLEN>; |
| 341 | * netobj fh; |
| 342 | * netobj oh; |
| 343 | * int uppid; |
| 344 | * unsigned l_offset; |
| 345 | * unsigned l_len; |
| 346 | * }; |
| 347 | */ |
| 348 | static void encode_nlm_lock(struct xdr_stream *xdr, |
| 349 | const struct nlm_lock *lock) |
| 350 | { |
| 351 | u32 l_offset, l_len; |
| 352 | __be32 *p; |
| 353 | |
| 354 | encode_caller_name(xdr, lock->caller); |
| 355 | encode_fh(xdr, &lock->fh); |
| 356 | encode_netobj(xdr, lock->oh.data, lock->oh.len); |
| 357 | |
| 358 | p = xdr_reserve_space(xdr, 4 + 4 + 4); |
| 359 | *p++ = cpu_to_be32(lock->svid); |
| 360 | |
| 361 | nlm_compute_offsets(lock, &l_offset, &l_len); |
| 362 | *p++ = cpu_to_be32(l_offset); |
| 363 | *p = cpu_to_be32(l_len); |
| 364 | } |
| 365 | |
| 366 | |
| 367 | /* |
| 368 | * NLMv3 XDR encode functions |
| 369 | * |
| 370 | * NLMv3 argument types are defined in Chapter 10 of The Open Group's |
| 371 | * "Protocols for Interworking: XNFS, Version 3W". |
| 372 | */ |
| 373 | |
| 374 | /* |
| 375 | * struct nlm_testargs { |
| 376 | * netobj cookie; |
| 377 | * bool exclusive; |
| 378 | * struct nlm_lock alock; |
| 379 | * }; |
| 380 | */ |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 381 | static void nlm_xdr_enc_testargs(struct rpc_rqst *req, |
| 382 | struct xdr_stream *xdr, |
| 383 | const struct nlm_args *args) |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 384 | { |
| 385 | const struct nlm_lock *lock = &args->lock; |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 386 | |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 387 | encode_cookie(xdr, &args->cookie); |
| 388 | encode_bool(xdr, lock->fl.fl_type == F_WRLCK); |
| 389 | encode_nlm_lock(xdr, lock); |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 390 | } |
| 391 | |
| 392 | /* |
| 393 | * struct nlm_lockargs { |
| 394 | * netobj cookie; |
| 395 | * bool block; |
| 396 | * bool exclusive; |
| 397 | * struct nlm_lock alock; |
| 398 | * bool reclaim; |
| 399 | * int state; |
| 400 | * }; |
| 401 | */ |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 402 | static void nlm_xdr_enc_lockargs(struct rpc_rqst *req, |
| 403 | struct xdr_stream *xdr, |
| 404 | const struct nlm_args *args) |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 405 | { |
| 406 | const struct nlm_lock *lock = &args->lock; |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 407 | |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 408 | encode_cookie(xdr, &args->cookie); |
| 409 | encode_bool(xdr, args->block); |
| 410 | encode_bool(xdr, lock->fl.fl_type == F_WRLCK); |
| 411 | encode_nlm_lock(xdr, lock); |
| 412 | encode_bool(xdr, args->reclaim); |
| 413 | encode_int32(xdr, args->state); |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 414 | } |
| 415 | |
| 416 | /* |
| 417 | * struct nlm_cancargs { |
| 418 | * netobj cookie; |
| 419 | * bool block; |
| 420 | * bool exclusive; |
| 421 | * struct nlm_lock alock; |
| 422 | * }; |
| 423 | */ |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 424 | static void nlm_xdr_enc_cancargs(struct rpc_rqst *req, |
| 425 | struct xdr_stream *xdr, |
| 426 | const struct nlm_args *args) |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 427 | { |
| 428 | const struct nlm_lock *lock = &args->lock; |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 429 | |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 430 | encode_cookie(xdr, &args->cookie); |
| 431 | encode_bool(xdr, args->block); |
| 432 | encode_bool(xdr, lock->fl.fl_type == F_WRLCK); |
| 433 | encode_nlm_lock(xdr, lock); |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 434 | } |
| 435 | |
| 436 | /* |
| 437 | * struct nlm_unlockargs { |
| 438 | * netobj cookie; |
| 439 | * struct nlm_lock alock; |
| 440 | * }; |
| 441 | */ |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 442 | static void nlm_xdr_enc_unlockargs(struct rpc_rqst *req, |
| 443 | struct xdr_stream *xdr, |
| 444 | const struct nlm_args *args) |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 445 | { |
| 446 | const struct nlm_lock *lock = &args->lock; |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 447 | |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 448 | encode_cookie(xdr, &args->cookie); |
| 449 | encode_nlm_lock(xdr, lock); |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 450 | } |
| 451 | |
| 452 | /* |
| 453 | * struct nlm_res { |
| 454 | * netobj cookie; |
| 455 | * nlm_stat stat; |
| 456 | * }; |
| 457 | */ |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 458 | static void nlm_xdr_enc_res(struct rpc_rqst *req, |
| 459 | struct xdr_stream *xdr, |
| 460 | const struct nlm_res *result) |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 461 | { |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 462 | encode_cookie(xdr, &result->cookie); |
| 463 | encode_nlm_stat(xdr, result->status); |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 464 | } |
| 465 | |
| 466 | /* |
| 467 | * union nlm_testrply switch (nlm_stats stat) { |
| 468 | * case LCK_DENIED: |
| 469 | * struct nlm_holder holder; |
| 470 | * default: |
| 471 | * void; |
| 472 | * }; |
| 473 | * |
| 474 | * struct nlm_testres { |
| 475 | * netobj cookie; |
| 476 | * nlm_testrply test_stat; |
| 477 | * }; |
| 478 | */ |
| 479 | static void encode_nlm_testrply(struct xdr_stream *xdr, |
| 480 | const struct nlm_res *result) |
| 481 | { |
| 482 | if (result->status == nlm_lck_denied) |
| 483 | encode_nlm_holder(xdr, result); |
| 484 | } |
| 485 | |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 486 | static void nlm_xdr_enc_testres(struct rpc_rqst *req, |
| 487 | struct xdr_stream *xdr, |
| 488 | const struct nlm_res *result) |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 489 | { |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 490 | encode_cookie(xdr, &result->cookie); |
| 491 | encode_nlm_stat(xdr, result->status); |
| 492 | encode_nlm_testrply(xdr, result); |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 493 | } |
| 494 | |
| 495 | |
| 496 | /* |
| 497 | * NLMv3 XDR decode functions |
| 498 | * |
| 499 | * NLMv3 result types are defined in Chapter 10 of The Open Group's |
| 500 | * "Protocols for Interworking: XNFS, Version 3W". |
| 501 | */ |
| 502 | |
| 503 | /* |
| 504 | * union nlm_testrply switch (nlm_stats stat) { |
| 505 | * case LCK_DENIED: |
| 506 | * struct nlm_holder holder; |
| 507 | * default: |
| 508 | * void; |
| 509 | * }; |
| 510 | * |
| 511 | * struct nlm_testres { |
| 512 | * netobj cookie; |
| 513 | * nlm_testrply test_stat; |
| 514 | * }; |
| 515 | */ |
| 516 | static int decode_nlm_testrply(struct xdr_stream *xdr, |
| 517 | struct nlm_res *result) |
| 518 | { |
| 519 | int error; |
| 520 | |
| 521 | error = decode_nlm_stat(xdr, &result->status); |
| 522 | if (unlikely(error)) |
| 523 | goto out; |
| 524 | if (result->status == nlm_lck_denied) |
| 525 | error = decode_nlm_holder(xdr, result); |
| 526 | out: |
| 527 | return error; |
| 528 | } |
| 529 | |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 530 | static int nlm_xdr_dec_testres(struct rpc_rqst *req, |
| 531 | struct xdr_stream *xdr, |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 532 | struct nlm_res *result) |
| 533 | { |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 534 | int error; |
| 535 | |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 536 | error = decode_cookie(xdr, &result->cookie); |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 537 | if (unlikely(error)) |
| 538 | goto out; |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 539 | error = decode_nlm_testrply(xdr, result); |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 540 | out: |
| 541 | return error; |
| 542 | } |
| 543 | |
| 544 | /* |
| 545 | * struct nlm_res { |
| 546 | * netobj cookie; |
| 547 | * nlm_stat stat; |
| 548 | * }; |
| 549 | */ |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 550 | static int nlm_xdr_dec_res(struct rpc_rqst *req, |
| 551 | struct xdr_stream *xdr, |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 552 | struct nlm_res *result) |
| 553 | { |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 554 | int error; |
| 555 | |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 556 | error = decode_cookie(xdr, &result->cookie); |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 557 | if (unlikely(error)) |
| 558 | goto out; |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 559 | error = decode_nlm_stat(xdr, &result->status); |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 560 | out: |
| 561 | return error; |
| 562 | } |
| 563 | |
| 564 | |
| 565 | /* |
| 566 | * For NLM, a void procedure really returns nothing |
| 567 | */ |
| 568 | #define nlm_xdr_dec_norep NULL |
| 569 | |
| 570 | #define PROC(proc, argtype, restype) \ |
| 571 | [NLMPROC_##proc] = { \ |
| 572 | .p_proc = NLMPROC_##proc, \ |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 573 | .p_encode = (kxdreproc_t)nlm_xdr_enc_##argtype, \ |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 574 | .p_decode = (kxdrdproc_t)nlm_xdr_dec_##restype, \ |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 575 | .p_arglen = NLM_##argtype##_sz, \ |
| 576 | .p_replen = NLM_##restype##_sz, \ |
| 577 | .p_statidx = NLMPROC_##proc, \ |
| 578 | .p_name = #proc, \ |
| 579 | } |
| 580 | |
| 581 | static struct rpc_procinfo nlm_procedures[] = { |
| 582 | PROC(TEST, testargs, testres), |
| 583 | PROC(LOCK, lockargs, res), |
| 584 | PROC(CANCEL, cancargs, res), |
| 585 | PROC(UNLOCK, unlockargs, res), |
| 586 | PROC(GRANTED, testargs, res), |
| 587 | PROC(TEST_MSG, testargs, norep), |
| 588 | PROC(LOCK_MSG, lockargs, norep), |
| 589 | PROC(CANCEL_MSG, cancargs, norep), |
| 590 | PROC(UNLOCK_MSG, unlockargs, norep), |
| 591 | PROC(GRANTED_MSG, testargs, norep), |
| 592 | PROC(TEST_RES, testres, norep), |
| 593 | PROC(LOCK_RES, res, norep), |
| 594 | PROC(CANCEL_RES, res, norep), |
| 595 | PROC(UNLOCK_RES, res, norep), |
| 596 | PROC(GRANTED_RES, res, norep), |
| 597 | }; |
| 598 | |
Trond Myklebust | a613fa1 | 2012-01-20 13:53:56 -0500 | [diff] [blame] | 599 | static const struct rpc_version nlm_version1 = { |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 600 | .number = 1, |
| 601 | .nrprocs = ARRAY_SIZE(nlm_procedures), |
| 602 | .procs = nlm_procedures, |
| 603 | }; |
| 604 | |
Trond Myklebust | a613fa1 | 2012-01-20 13:53:56 -0500 | [diff] [blame] | 605 | static const struct rpc_version nlm_version3 = { |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 606 | .number = 3, |
| 607 | .nrprocs = ARRAY_SIZE(nlm_procedures), |
| 608 | .procs = nlm_procedures, |
| 609 | }; |
| 610 | |
Trond Myklebust | a613fa1 | 2012-01-20 13:53:56 -0500 | [diff] [blame] | 611 | static const struct rpc_version *nlm_versions[] = { |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 612 | [1] = &nlm_version1, |
| 613 | [3] = &nlm_version3, |
| 614 | #ifdef CONFIG_LOCKD_V4 |
| 615 | [4] = &nlm_version4, |
| 616 | #endif |
| 617 | }; |
| 618 | |
| 619 | static struct rpc_stat nlm_rpc_stats; |
| 620 | |
Trond Myklebust | a613fa1 | 2012-01-20 13:53:56 -0500 | [diff] [blame] | 621 | const struct rpc_program nlm_program = { |
Chuck Lever | 2b061f9 | 2010-12-14 14:55:40 +0000 | [diff] [blame] | 622 | .name = "lockd", |
| 623 | .number = NLM_PROGRAM, |
| 624 | .nrvers = ARRAY_SIZE(nlm_versions), |
| 625 | .version = nlm_versions, |
| 626 | .stats = &nlm_rpc_stats, |
| 627 | }; |