1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/nfs/nfs3xdr.c 4 * 5 * XDR functions to encode/decode NFSv3 RPC arguments and results. 6 * 7 * Copyright (C) 1996, 1997 Olaf Kirch 8 */ 9 10 #include <linux/param.h> 11 #include <linux/time.h> 12 #include <linux/mm.h> 13 #include <linux/errno.h> 14 #include <linux/string.h> 15 #include <linux/in.h> 16 #include <linux/pagemap.h> 17 #include <linux/proc_fs.h> 18 #include <linux/kdev_t.h> 19 #include <linux/sunrpc/clnt.h> 20 #include <linux/nfs.h> 21 #include <linux/nfs3.h> 22 #include <linux/nfs_fs.h> 23 #include <linux/nfsacl.h> 24 #include "nfstrace.h" 25 #include "internal.h" 26 27 #define NFSDBG_FACILITY NFSDBG_XDR 28 29 /* Mapping from NFS error code to "errno" error code. */ 30 #define errno_NFSERR_IO EIO 31 32 /* 33 * Declare the space requirements for NFS arguments and replies as 34 * number of 32bit-words 35 */ 36 #define NFS3_pagepad_sz (1) /* Page padding */ 37 #define NFS3_fhandle_sz (1+16) 38 #define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */ 39 #define NFS3_post_op_fh_sz (1+NFS3_fh_sz) 40 #define NFS3_sattr_sz (15) 41 #define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2)) 42 #define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2)) 43 #define NFS3_fattr_sz (21) 44 #define NFS3_cookieverf_sz (NFS3_COOKIEVERFSIZE>>2) 45 #define NFS3_wcc_attr_sz (6) 46 #define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz) 47 #define NFS3_post_op_attr_sz (1+NFS3_fattr_sz) 48 #define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz) 49 #define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz) 50 51 #define NFS3_getattrargs_sz (NFS3_fh_sz) 52 #define NFS3_setattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3) 53 #define NFS3_lookupargs_sz (NFS3_fh_sz+NFS3_filename_sz) 54 #define NFS3_accessargs_sz (NFS3_fh_sz+1) 55 #define NFS3_readlinkargs_sz (NFS3_fh_sz) 56 #define NFS3_readargs_sz (NFS3_fh_sz+3) 57 #define NFS3_writeargs_sz (NFS3_fh_sz+5) 58 #define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz) 59 #define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz) 60 #define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz) 61 #define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz) 62 #define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz) 63 #define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz) 64 #define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz) 65 #define NFS3_readdirargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+3) 66 #define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4) 67 #define NFS3_commitargs_sz (NFS3_fh_sz+3) 68 69 #define NFS3_getattrres_sz (1+NFS3_fattr_sz) 70 #define NFS3_setattrres_sz (1+NFS3_wcc_data_sz) 71 #define NFS3_removeres_sz (NFS3_setattrres_sz) 72 #define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz)) 73 #define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1) 74 #define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1+NFS3_pagepad_sz) 75 #define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3+NFS3_pagepad_sz) 76 #define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4) 77 #define NFS3_createres_sz (1+NFS3_post_op_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz) 78 #define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz)) 79 #define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz) 80 #define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2+NFS3_pagepad_sz) 81 #define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13) 82 #define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12) 83 #define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6) 84 #define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2) 85 86 #define ACL3_getaclargs_sz (NFS3_fh_sz+1) 87 #define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \ 88 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)) 89 #define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \ 90 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)+\ 91 NFS3_pagepad_sz) 92 #define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz) 93 94 static int nfs3_stat_to_errno(enum nfs_stat); 95 96 /* 97 * Map file type to S_IFMT bits 98 */ 99 static const umode_t nfs_type2fmt[] = { 100 [NF3BAD] = 0, 101 [NF3REG] = S_IFREG, 102 [NF3DIR] = S_IFDIR, 103 [NF3BLK] = S_IFBLK, 104 [NF3CHR] = S_IFCHR, 105 [NF3LNK] = S_IFLNK, 106 [NF3SOCK] = S_IFSOCK, 107 [NF3FIFO] = S_IFIFO, 108 }; 109 110 static struct user_namespace *rpc_userns(const struct rpc_clnt *clnt) 111 { 112 if (clnt && clnt->cl_cred) 113 return clnt->cl_cred->user_ns; 114 return &init_user_ns; 115 } 116 117 static struct user_namespace *rpc_rqst_userns(const struct rpc_rqst *rqstp) 118 { 119 if (rqstp->rq_task) 120 return rpc_userns(rqstp->rq_task->tk_client); 121 return &init_user_ns; 122 } 123 124 /* 125 * Encode/decode NFSv3 basic data types 126 * 127 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813: 128 * "NFS Version 3 Protocol Specification". 129 * 130 * Not all basic data types have their own encoding and decoding 131 * functions. For run-time efficiency, some data types are encoded 132 * or decoded inline. 133 */ 134 135 static void encode_uint32(struct xdr_stream *xdr, u32 value) 136 { 137 __be32 *p = xdr_reserve_space(xdr, 4); 138 *p = cpu_to_be32(value); 139 } 140 141 static int decode_uint32(struct xdr_stream *xdr, u32 *value) 142 { 143 __be32 *p; 144 145 p = xdr_inline_decode(xdr, 4); 146 if (unlikely(!p)) 147 return -EIO; 148 *value = be32_to_cpup(p); 149 return 0; 150 } 151 152 static int decode_uint64(struct xdr_stream *xdr, u64 *value) 153 { 154 __be32 *p; 155 156 p = xdr_inline_decode(xdr, 8); 157 if (unlikely(!p)) 158 return -EIO; 159 xdr_decode_hyper(p, value); 160 return 0; 161 } 162 163 /* 164 * fileid3 165 * 166 * typedef uint64 fileid3; 167 */ 168 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid) 169 { 170 return xdr_decode_hyper(p, fileid); 171 } 172 173 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid) 174 { 175 return decode_uint64(xdr, fileid); 176 } 177 178 /* 179 * filename3 180 * 181 * typedef string filename3<>; 182 */ 183 static void encode_filename3(struct xdr_stream *xdr, 184 const char *name, u32 length) 185 { 186 __be32 *p; 187 188 WARN_ON_ONCE(length > NFS3_MAXNAMLEN); 189 p = xdr_reserve_space(xdr, 4 + length); 190 xdr_encode_opaque(p, name, length); 191 } 192 193 static int decode_inline_filename3(struct xdr_stream *xdr, 194 const char **name, u32 *length) 195 { 196 __be32 *p; 197 u32 count; 198 199 p = xdr_inline_decode(xdr, 4); 200 if (unlikely(!p)) 201 return -EIO; 202 count = be32_to_cpup(p); 203 if (count > NFS3_MAXNAMLEN) 204 goto out_nametoolong; 205 p = xdr_inline_decode(xdr, count); 206 if (unlikely(!p)) 207 return -EIO; 208 *name = (const char *)p; 209 *length = count; 210 return 0; 211 212 out_nametoolong: 213 dprintk("NFS: returned filename too long: %u\n", count); 214 return -ENAMETOOLONG; 215 } 216 217 /* 218 * nfspath3 219 * 220 * typedef string nfspath3<>; 221 */ 222 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages, 223 const u32 length) 224 { 225 encode_uint32(xdr, length); 226 xdr_write_pages(xdr, pages, 0, length); 227 } 228 229 static int decode_nfspath3(struct xdr_stream *xdr) 230 { 231 u32 recvd, count; 232 __be32 *p; 233 234 p = xdr_inline_decode(xdr, 4); 235 if (unlikely(!p)) 236 return -EIO; 237 count = be32_to_cpup(p); 238 if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN)) 239 goto out_nametoolong; 240 recvd = xdr_read_pages(xdr, count); 241 if (unlikely(count > recvd)) 242 goto out_cheating; 243 xdr_terminate_string(xdr->buf, count); 244 return 0; 245 246 out_nametoolong: 247 dprintk("NFS: returned pathname too long: %u\n", count); 248 return -ENAMETOOLONG; 249 out_cheating: 250 dprintk("NFS: server cheating in pathname result: " 251 "count %u > recvd %u\n", count, recvd); 252 return -EIO; 253 } 254 255 /* 256 * cookie3 257 * 258 * typedef uint64 cookie3 259 */ 260 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie) 261 { 262 return xdr_encode_hyper(p, cookie); 263 } 264 265 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie) 266 { 267 return decode_uint64(xdr, cookie); 268 } 269 270 /* 271 * cookieverf3 272 * 273 * typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE]; 274 */ 275 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier) 276 { 277 memcpy(p, verifier, NFS3_COOKIEVERFSIZE); 278 return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE); 279 } 280 281 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier) 282 { 283 __be32 *p; 284 285 p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE); 286 if (unlikely(!p)) 287 return -EIO; 288 memcpy(verifier, p, NFS3_COOKIEVERFSIZE); 289 return 0; 290 } 291 292 /* 293 * createverf3 294 * 295 * typedef opaque createverf3[NFS3_CREATEVERFSIZE]; 296 */ 297 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier) 298 { 299 __be32 *p; 300 301 p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE); 302 memcpy(p, verifier, NFS3_CREATEVERFSIZE); 303 } 304 305 static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier) 306 { 307 __be32 *p; 308 309 p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE); 310 if (unlikely(!p)) 311 return -EIO; 312 memcpy(verifier->data, p, NFS3_WRITEVERFSIZE); 313 return 0; 314 } 315 316 /* 317 * size3 318 * 319 * typedef uint64 size3; 320 */ 321 static __be32 *xdr_decode_size3(__be32 *p, u64 *size) 322 { 323 return xdr_decode_hyper(p, size); 324 } 325 326 /* 327 * nfsstat3 328 * 329 * enum nfsstat3 { 330 * NFS3_OK = 0, 331 * ... 332 * } 333 */ 334 #define NFS3_OK NFS_OK 335 336 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status) 337 { 338 __be32 *p; 339 340 p = xdr_inline_decode(xdr, 4); 341 if (unlikely(!p)) 342 return -EIO; 343 if (unlikely(*p != cpu_to_be32(NFS3_OK))) 344 goto out_status; 345 *status = 0; 346 return 0; 347 out_status: 348 *status = be32_to_cpup(p); 349 trace_nfs_xdr_status(xdr, (int)*status); 350 return 0; 351 } 352 353 /* 354 * ftype3 355 * 356 * enum ftype3 { 357 * NF3REG = 1, 358 * NF3DIR = 2, 359 * NF3BLK = 3, 360 * NF3CHR = 4, 361 * NF3LNK = 5, 362 * NF3SOCK = 6, 363 * NF3FIFO = 7 364 * }; 365 */ 366 static void encode_ftype3(struct xdr_stream *xdr, const u32 type) 367 { 368 encode_uint32(xdr, type); 369 } 370 371 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode) 372 { 373 u32 type; 374 375 type = be32_to_cpup(p++); 376 if (type > NF3FIFO) 377 type = NF3NON; 378 *mode = nfs_type2fmt[type]; 379 return p; 380 } 381 382 /* 383 * specdata3 384 * 385 * struct specdata3 { 386 * uint32 specdata1; 387 * uint32 specdata2; 388 * }; 389 */ 390 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev) 391 { 392 __be32 *p; 393 394 p = xdr_reserve_space(xdr, 8); 395 *p++ = cpu_to_be32(MAJOR(rdev)); 396 *p = cpu_to_be32(MINOR(rdev)); 397 } 398 399 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev) 400 { 401 unsigned int major, minor; 402 403 major = be32_to_cpup(p++); 404 minor = be32_to_cpup(p++); 405 *rdev = MKDEV(major, minor); 406 if (MAJOR(*rdev) != major || MINOR(*rdev) != minor) 407 *rdev = 0; 408 return p; 409 } 410 411 /* 412 * nfs_fh3 413 * 414 * struct nfs_fh3 { 415 * opaque data<NFS3_FHSIZE>; 416 * }; 417 */ 418 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh) 419 { 420 __be32 *p; 421 422 WARN_ON_ONCE(fh->size > NFS3_FHSIZE); 423 p = xdr_reserve_space(xdr, 4 + fh->size); 424 xdr_encode_opaque(p, fh->data, fh->size); 425 } 426 427 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh) 428 { 429 u32 length; 430 __be32 *p; 431 432 p = xdr_inline_decode(xdr, 4); 433 if (unlikely(!p)) 434 return -EIO; 435 length = be32_to_cpup(p++); 436 if (unlikely(length > NFS3_FHSIZE || length == 0)) 437 goto out_toobig; 438 p = xdr_inline_decode(xdr, length); 439 if (unlikely(!p)) 440 return -EIO; 441 fh->size = length; 442 memcpy(fh->data, p, length); 443 return 0; 444 out_toobig: 445 trace_nfs_xdr_bad_filehandle(xdr, NFSERR_BADHANDLE); 446 return -E2BIG; 447 } 448 449 static void zero_nfs_fh3(struct nfs_fh *fh) 450 { 451 memset(fh, 0, sizeof(*fh)); 452 } 453 454 /* 455 * nfstime3 456 * 457 * struct nfstime3 { 458 * uint32 seconds; 459 * uint32 nseconds; 460 * }; 461 */ 462 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec64 *timep) 463 { 464 *p++ = cpu_to_be32((u32)timep->tv_sec); 465 *p++ = cpu_to_be32(timep->tv_nsec); 466 return p; 467 } 468 469 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec64 *timep) 470 { 471 timep->tv_sec = be32_to_cpup(p++); 472 timep->tv_nsec = be32_to_cpup(p++); 473 return p; 474 } 475 476 /* 477 * sattr3 478 * 479 * enum time_how { 480 * DONT_CHANGE = 0, 481 * SET_TO_SERVER_TIME = 1, 482 * SET_TO_CLIENT_TIME = 2 483 * }; 484 * 485 * union set_mode3 switch (bool set_it) { 486 * case TRUE: 487 * mode3 mode; 488 * default: 489 * void; 490 * }; 491 * 492 * union set_uid3 switch (bool set_it) { 493 * case TRUE: 494 * uid3 uid; 495 * default: 496 * void; 497 * }; 498 * 499 * union set_gid3 switch (bool set_it) { 500 * case TRUE: 501 * gid3 gid; 502 * default: 503 * void; 504 * }; 505 * 506 * union set_size3 switch (bool set_it) { 507 * case TRUE: 508 * size3 size; 509 * default: 510 * void; 511 * }; 512 * 513 * union set_atime switch (time_how set_it) { 514 * case SET_TO_CLIENT_TIME: 515 * nfstime3 atime; 516 * default: 517 * void; 518 * }; 519 * 520 * union set_mtime switch (time_how set_it) { 521 * case SET_TO_CLIENT_TIME: 522 * nfstime3 mtime; 523 * default: 524 * void; 525 * }; 526 * 527 * struct sattr3 { 528 * set_mode3 mode; 529 * set_uid3 uid; 530 * set_gid3 gid; 531 * set_size3 size; 532 * set_atime atime; 533 * set_mtime mtime; 534 * }; 535 */ 536 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr, 537 struct user_namespace *userns) 538 { 539 u32 nbytes; 540 __be32 *p; 541 542 /* 543 * In order to make only a single xdr_reserve_space() call, 544 * pre-compute the total number of bytes to be reserved. 545 * Six boolean values, one for each set_foo field, are always 546 * present in the encoded result, so start there. 547 */ 548 nbytes = 6 * 4; 549 if (attr->ia_valid & ATTR_MODE) 550 nbytes += 4; 551 if (attr->ia_valid & ATTR_UID) 552 nbytes += 4; 553 if (attr->ia_valid & ATTR_GID) 554 nbytes += 4; 555 if (attr->ia_valid & ATTR_SIZE) 556 nbytes += 8; 557 if (attr->ia_valid & ATTR_ATIME_SET) 558 nbytes += 8; 559 if (attr->ia_valid & ATTR_MTIME_SET) 560 nbytes += 8; 561 p = xdr_reserve_space(xdr, nbytes); 562 563 if (attr->ia_valid & ATTR_MODE) { 564 *p++ = xdr_one; 565 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO); 566 } else 567 *p++ = xdr_zero; 568 569 if (attr->ia_valid & ATTR_UID) { 570 *p++ = xdr_one; 571 *p++ = cpu_to_be32(from_kuid_munged(userns, attr->ia_uid)); 572 } else 573 *p++ = xdr_zero; 574 575 if (attr->ia_valid & ATTR_GID) { 576 *p++ = xdr_one; 577 *p++ = cpu_to_be32(from_kgid_munged(userns, attr->ia_gid)); 578 } else 579 *p++ = xdr_zero; 580 581 if (attr->ia_valid & ATTR_SIZE) { 582 *p++ = xdr_one; 583 p = xdr_encode_hyper(p, (u64)attr->ia_size); 584 } else 585 *p++ = xdr_zero; 586 587 if (attr->ia_valid & ATTR_ATIME_SET) { 588 *p++ = xdr_two; 589 p = xdr_encode_nfstime3(p, &attr->ia_atime); 590 } else if (attr->ia_valid & ATTR_ATIME) { 591 *p++ = xdr_one; 592 } else 593 *p++ = xdr_zero; 594 595 if (attr->ia_valid & ATTR_MTIME_SET) { 596 *p++ = xdr_two; 597 xdr_encode_nfstime3(p, &attr->ia_mtime); 598 } else if (attr->ia_valid & ATTR_MTIME) { 599 *p = xdr_one; 600 } else 601 *p = xdr_zero; 602 } 603 604 /* 605 * fattr3 606 * 607 * struct fattr3 { 608 * ftype3 type; 609 * mode3 mode; 610 * uint32 nlink; 611 * uid3 uid; 612 * gid3 gid; 613 * size3 size; 614 * size3 used; 615 * specdata3 rdev; 616 * uint64 fsid; 617 * fileid3 fileid; 618 * nfstime3 atime; 619 * nfstime3 mtime; 620 * nfstime3 ctime; 621 * }; 622 */ 623 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr, 624 struct user_namespace *userns) 625 { 626 umode_t fmode; 627 __be32 *p; 628 629 p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2); 630 if (unlikely(!p)) 631 return -EIO; 632 633 p = xdr_decode_ftype3(p, &fmode); 634 635 fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode; 636 fattr->nlink = be32_to_cpup(p++); 637 fattr->uid = make_kuid(userns, be32_to_cpup(p++)); 638 if (!uid_valid(fattr->uid)) 639 goto out_uid; 640 fattr->gid = make_kgid(userns, be32_to_cpup(p++)); 641 if (!gid_valid(fattr->gid)) 642 goto out_gid; 643 644 p = xdr_decode_size3(p, &fattr->size); 645 p = xdr_decode_size3(p, &fattr->du.nfs3.used); 646 p = xdr_decode_specdata3(p, &fattr->rdev); 647 648 p = xdr_decode_hyper(p, &fattr->fsid.major); 649 fattr->fsid.minor = 0; 650 651 p = xdr_decode_fileid3(p, &fattr->fileid); 652 p = xdr_decode_nfstime3(p, &fattr->atime); 653 p = xdr_decode_nfstime3(p, &fattr->mtime); 654 xdr_decode_nfstime3(p, &fattr->ctime); 655 fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime); 656 657 fattr->valid |= NFS_ATTR_FATTR_V3; 658 return 0; 659 out_uid: 660 dprintk("NFS: returned invalid uid\n"); 661 return -EINVAL; 662 out_gid: 663 dprintk("NFS: returned invalid gid\n"); 664 return -EINVAL; 665 } 666 667 /* 668 * post_op_attr 669 * 670 * union post_op_attr switch (bool attributes_follow) { 671 * case TRUE: 672 * fattr3 attributes; 673 * case FALSE: 674 * void; 675 * }; 676 */ 677 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr, 678 struct user_namespace *userns) 679 { 680 __be32 *p; 681 682 p = xdr_inline_decode(xdr, 4); 683 if (unlikely(!p)) 684 return -EIO; 685 if (*p != xdr_zero) 686 return decode_fattr3(xdr, fattr, userns); 687 return 0; 688 } 689 690 /* 691 * wcc_attr 692 * struct wcc_attr { 693 * size3 size; 694 * nfstime3 mtime; 695 * nfstime3 ctime; 696 * }; 697 */ 698 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr) 699 { 700 __be32 *p; 701 702 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2); 703 if (unlikely(!p)) 704 return -EIO; 705 706 fattr->valid |= NFS_ATTR_FATTR_PRESIZE 707 | NFS_ATTR_FATTR_PRECHANGE 708 | NFS_ATTR_FATTR_PREMTIME 709 | NFS_ATTR_FATTR_PRECTIME; 710 711 p = xdr_decode_size3(p, &fattr->pre_size); 712 p = xdr_decode_nfstime3(p, &fattr->pre_mtime); 713 xdr_decode_nfstime3(p, &fattr->pre_ctime); 714 fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime); 715 716 return 0; 717 } 718 719 /* 720 * pre_op_attr 721 * union pre_op_attr switch (bool attributes_follow) { 722 * case TRUE: 723 * wcc_attr attributes; 724 * case FALSE: 725 * void; 726 * }; 727 * 728 * wcc_data 729 * 730 * struct wcc_data { 731 * pre_op_attr before; 732 * post_op_attr after; 733 * }; 734 */ 735 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr) 736 { 737 __be32 *p; 738 739 p = xdr_inline_decode(xdr, 4); 740 if (unlikely(!p)) 741 return -EIO; 742 if (*p != xdr_zero) 743 return decode_wcc_attr(xdr, fattr); 744 return 0; 745 } 746 747 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr, 748 struct user_namespace *userns) 749 { 750 int error; 751 752 error = decode_pre_op_attr(xdr, fattr); 753 if (unlikely(error)) 754 goto out; 755 error = decode_post_op_attr(xdr, fattr, userns); 756 out: 757 return error; 758 } 759 760 /* 761 * post_op_fh3 762 * 763 * union post_op_fh3 switch (bool handle_follows) { 764 * case TRUE: 765 * nfs_fh3 handle; 766 * case FALSE: 767 * void; 768 * }; 769 */ 770 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh) 771 { 772 __be32 *p = xdr_inline_decode(xdr, 4); 773 if (unlikely(!p)) 774 return -EIO; 775 if (*p != xdr_zero) 776 return decode_nfs_fh3(xdr, fh); 777 zero_nfs_fh3(fh); 778 return 0; 779 } 780 781 /* 782 * diropargs3 783 * 784 * struct diropargs3 { 785 * nfs_fh3 dir; 786 * filename3 name; 787 * }; 788 */ 789 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh, 790 const char *name, u32 length) 791 { 792 encode_nfs_fh3(xdr, fh); 793 encode_filename3(xdr, name, length); 794 } 795 796 797 /* 798 * NFSv3 XDR encode functions 799 * 800 * NFSv3 argument types are defined in section 3.3 of RFC 1813: 801 * "NFS Version 3 Protocol Specification". 802 */ 803 804 /* 805 * 3.3.1 GETATTR3args 806 * 807 * struct GETATTR3args { 808 * nfs_fh3 object; 809 * }; 810 */ 811 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req, 812 struct xdr_stream *xdr, 813 const void *data) 814 { 815 const struct nfs_fh *fh = data; 816 817 encode_nfs_fh3(xdr, fh); 818 } 819 820 /* 821 * 3.3.2 SETATTR3args 822 * 823 * union sattrguard3 switch (bool check) { 824 * case TRUE: 825 * nfstime3 obj_ctime; 826 * case FALSE: 827 * void; 828 * }; 829 * 830 * struct SETATTR3args { 831 * nfs_fh3 object; 832 * sattr3 new_attributes; 833 * sattrguard3 guard; 834 * }; 835 */ 836 static void encode_sattrguard3(struct xdr_stream *xdr, 837 const struct nfs3_sattrargs *args) 838 { 839 __be32 *p; 840 841 if (args->guard) { 842 p = xdr_reserve_space(xdr, 4 + 8); 843 *p++ = xdr_one; 844 xdr_encode_nfstime3(p, &args->guardtime); 845 } else { 846 p = xdr_reserve_space(xdr, 4); 847 *p = xdr_zero; 848 } 849 } 850 851 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req, 852 struct xdr_stream *xdr, 853 const void *data) 854 { 855 const struct nfs3_sattrargs *args = data; 856 encode_nfs_fh3(xdr, args->fh); 857 encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req)); 858 encode_sattrguard3(xdr, args); 859 } 860 861 /* 862 * 3.3.3 LOOKUP3args 863 * 864 * struct LOOKUP3args { 865 * diropargs3 what; 866 * }; 867 */ 868 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req, 869 struct xdr_stream *xdr, 870 const void *data) 871 { 872 const struct nfs3_diropargs *args = data; 873 874 encode_diropargs3(xdr, args->fh, args->name, args->len); 875 } 876 877 /* 878 * 3.3.4 ACCESS3args 879 * 880 * struct ACCESS3args { 881 * nfs_fh3 object; 882 * uint32 access; 883 * }; 884 */ 885 static void encode_access3args(struct xdr_stream *xdr, 886 const struct nfs3_accessargs *args) 887 { 888 encode_nfs_fh3(xdr, args->fh); 889 encode_uint32(xdr, args->access); 890 } 891 892 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req, 893 struct xdr_stream *xdr, 894 const void *data) 895 { 896 const struct nfs3_accessargs *args = data; 897 898 encode_access3args(xdr, args); 899 } 900 901 /* 902 * 3.3.5 READLINK3args 903 * 904 * struct READLINK3args { 905 * nfs_fh3 symlink; 906 * }; 907 */ 908 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req, 909 struct xdr_stream *xdr, 910 const void *data) 911 { 912 const struct nfs3_readlinkargs *args = data; 913 914 encode_nfs_fh3(xdr, args->fh); 915 rpc_prepare_reply_pages(req, args->pages, args->pgbase, args->pglen, 916 NFS3_readlinkres_sz - NFS3_pagepad_sz); 917 } 918 919 /* 920 * 3.3.6 READ3args 921 * 922 * struct READ3args { 923 * nfs_fh3 file; 924 * offset3 offset; 925 * count3 count; 926 * }; 927 */ 928 static void encode_read3args(struct xdr_stream *xdr, 929 const struct nfs_pgio_args *args) 930 { 931 __be32 *p; 932 933 encode_nfs_fh3(xdr, args->fh); 934 935 p = xdr_reserve_space(xdr, 8 + 4); 936 p = xdr_encode_hyper(p, args->offset); 937 *p = cpu_to_be32(args->count); 938 } 939 940 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req, 941 struct xdr_stream *xdr, 942 const void *data) 943 { 944 const struct nfs_pgio_args *args = data; 945 unsigned int replen = args->replen ? args->replen : 946 NFS3_readres_sz - NFS3_pagepad_sz; 947 948 encode_read3args(xdr, args); 949 rpc_prepare_reply_pages(req, args->pages, args->pgbase, 950 args->count, replen); 951 req->rq_rcv_buf.flags |= XDRBUF_READ; 952 } 953 954 /* 955 * 3.3.7 WRITE3args 956 * 957 * enum stable_how { 958 * UNSTABLE = 0, 959 * DATA_SYNC = 1, 960 * FILE_SYNC = 2 961 * }; 962 * 963 * struct WRITE3args { 964 * nfs_fh3 file; 965 * offset3 offset; 966 * count3 count; 967 * stable_how stable; 968 * opaque data<>; 969 * }; 970 */ 971 static void encode_write3args(struct xdr_stream *xdr, 972 const struct nfs_pgio_args *args) 973 { 974 __be32 *p; 975 976 encode_nfs_fh3(xdr, args->fh); 977 978 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4); 979 p = xdr_encode_hyper(p, args->offset); 980 *p++ = cpu_to_be32(args->count); 981 *p++ = cpu_to_be32(args->stable); 982 *p = cpu_to_be32(args->count); 983 xdr_write_pages(xdr, args->pages, args->pgbase, args->count); 984 } 985 986 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req, 987 struct xdr_stream *xdr, 988 const void *data) 989 { 990 const struct nfs_pgio_args *args = data; 991 992 encode_write3args(xdr, args); 993 xdr->buf->flags |= XDRBUF_WRITE; 994 } 995 996 /* 997 * 3.3.8 CREATE3args 998 * 999 * enum createmode3 { 1000 * UNCHECKED = 0, 1001 * GUARDED = 1, 1002 * EXCLUSIVE = 2 1003 * }; 1004 * 1005 * union createhow3 switch (createmode3 mode) { 1006 * case UNCHECKED: 1007 * case GUARDED: 1008 * sattr3 obj_attributes; 1009 * case EXCLUSIVE: 1010 * createverf3 verf; 1011 * }; 1012 * 1013 * struct CREATE3args { 1014 * diropargs3 where; 1015 * createhow3 how; 1016 * }; 1017 */ 1018 static void encode_createhow3(struct xdr_stream *xdr, 1019 const struct nfs3_createargs *args, 1020 struct user_namespace *userns) 1021 { 1022 encode_uint32(xdr, args->createmode); 1023 switch (args->createmode) { 1024 case NFS3_CREATE_UNCHECKED: 1025 case NFS3_CREATE_GUARDED: 1026 encode_sattr3(xdr, args->sattr, userns); 1027 break; 1028 case NFS3_CREATE_EXCLUSIVE: 1029 encode_createverf3(xdr, args->verifier); 1030 break; 1031 default: 1032 BUG(); 1033 } 1034 } 1035 1036 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req, 1037 struct xdr_stream *xdr, 1038 const void *data) 1039 { 1040 const struct nfs3_createargs *args = data; 1041 1042 encode_diropargs3(xdr, args->fh, args->name, args->len); 1043 encode_createhow3(xdr, args, rpc_rqst_userns(req)); 1044 } 1045 1046 /* 1047 * 3.3.9 MKDIR3args 1048 * 1049 * struct MKDIR3args { 1050 * diropargs3 where; 1051 * sattr3 attributes; 1052 * }; 1053 */ 1054 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req, 1055 struct xdr_stream *xdr, 1056 const void *data) 1057 { 1058 const struct nfs3_mkdirargs *args = data; 1059 1060 encode_diropargs3(xdr, args->fh, args->name, args->len); 1061 encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req)); 1062 } 1063 1064 /* 1065 * 3.3.10 SYMLINK3args 1066 * 1067 * struct symlinkdata3 { 1068 * sattr3 symlink_attributes; 1069 * nfspath3 symlink_data; 1070 * }; 1071 * 1072 * struct SYMLINK3args { 1073 * diropargs3 where; 1074 * symlinkdata3 symlink; 1075 * }; 1076 */ 1077 static void encode_symlinkdata3(struct xdr_stream *xdr, 1078 const void *data, 1079 struct user_namespace *userns) 1080 { 1081 const struct nfs3_symlinkargs *args = data; 1082 1083 encode_sattr3(xdr, args->sattr, userns); 1084 encode_nfspath3(xdr, args->pages, args->pathlen); 1085 } 1086 1087 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req, 1088 struct xdr_stream *xdr, 1089 const void *data) 1090 { 1091 const struct nfs3_symlinkargs *args = data; 1092 1093 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen); 1094 encode_symlinkdata3(xdr, args, rpc_rqst_userns(req)); 1095 xdr->buf->flags |= XDRBUF_WRITE; 1096 } 1097 1098 /* 1099 * 3.3.11 MKNOD3args 1100 * 1101 * struct devicedata3 { 1102 * sattr3 dev_attributes; 1103 * specdata3 spec; 1104 * }; 1105 * 1106 * union mknoddata3 switch (ftype3 type) { 1107 * case NF3CHR: 1108 * case NF3BLK: 1109 * devicedata3 device; 1110 * case NF3SOCK: 1111 * case NF3FIFO: 1112 * sattr3 pipe_attributes; 1113 * default: 1114 * void; 1115 * }; 1116 * 1117 * struct MKNOD3args { 1118 * diropargs3 where; 1119 * mknoddata3 what; 1120 * }; 1121 */ 1122 static void encode_devicedata3(struct xdr_stream *xdr, 1123 const struct nfs3_mknodargs *args, 1124 struct user_namespace *userns) 1125 { 1126 encode_sattr3(xdr, args->sattr, userns); 1127 encode_specdata3(xdr, args->rdev); 1128 } 1129 1130 static void encode_mknoddata3(struct xdr_stream *xdr, 1131 const struct nfs3_mknodargs *args, 1132 struct user_namespace *userns) 1133 { 1134 encode_ftype3(xdr, args->type); 1135 switch (args->type) { 1136 case NF3CHR: 1137 case NF3BLK: 1138 encode_devicedata3(xdr, args, userns); 1139 break; 1140 case NF3SOCK: 1141 case NF3FIFO: 1142 encode_sattr3(xdr, args->sattr, userns); 1143 break; 1144 case NF3REG: 1145 case NF3DIR: 1146 break; 1147 default: 1148 BUG(); 1149 } 1150 } 1151 1152 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req, 1153 struct xdr_stream *xdr, 1154 const void *data) 1155 { 1156 const struct nfs3_mknodargs *args = data; 1157 1158 encode_diropargs3(xdr, args->fh, args->name, args->len); 1159 encode_mknoddata3(xdr, args, rpc_rqst_userns(req)); 1160 } 1161 1162 /* 1163 * 3.3.12 REMOVE3args 1164 * 1165 * struct REMOVE3args { 1166 * diropargs3 object; 1167 * }; 1168 */ 1169 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req, 1170 struct xdr_stream *xdr, 1171 const void *data) 1172 { 1173 const struct nfs_removeargs *args = data; 1174 1175 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len); 1176 } 1177 1178 /* 1179 * 3.3.14 RENAME3args 1180 * 1181 * struct RENAME3args { 1182 * diropargs3 from; 1183 * diropargs3 to; 1184 * }; 1185 */ 1186 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req, 1187 struct xdr_stream *xdr, 1188 const void *data) 1189 { 1190 const struct nfs_renameargs *args = data; 1191 const struct qstr *old = args->old_name; 1192 const struct qstr *new = args->new_name; 1193 1194 encode_diropargs3(xdr, args->old_dir, old->name, old->len); 1195 encode_diropargs3(xdr, args->new_dir, new->name, new->len); 1196 } 1197 1198 /* 1199 * 3.3.15 LINK3args 1200 * 1201 * struct LINK3args { 1202 * nfs_fh3 file; 1203 * diropargs3 link; 1204 * }; 1205 */ 1206 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req, 1207 struct xdr_stream *xdr, 1208 const void *data) 1209 { 1210 const struct nfs3_linkargs *args = data; 1211 1212 encode_nfs_fh3(xdr, args->fromfh); 1213 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen); 1214 } 1215 1216 /* 1217 * 3.3.16 READDIR3args 1218 * 1219 * struct READDIR3args { 1220 * nfs_fh3 dir; 1221 * cookie3 cookie; 1222 * cookieverf3 cookieverf; 1223 * count3 count; 1224 * }; 1225 */ 1226 static void encode_readdir3args(struct xdr_stream *xdr, 1227 const struct nfs3_readdirargs *args) 1228 { 1229 __be32 *p; 1230 1231 encode_nfs_fh3(xdr, args->fh); 1232 1233 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4); 1234 p = xdr_encode_cookie3(p, args->cookie); 1235 p = xdr_encode_cookieverf3(p, args->verf); 1236 *p = cpu_to_be32(args->count); 1237 } 1238 1239 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req, 1240 struct xdr_stream *xdr, 1241 const void *data) 1242 { 1243 const struct nfs3_readdirargs *args = data; 1244 1245 encode_readdir3args(xdr, args); 1246 rpc_prepare_reply_pages(req, args->pages, 0, args->count, 1247 NFS3_readdirres_sz - NFS3_pagepad_sz); 1248 } 1249 1250 /* 1251 * 3.3.17 READDIRPLUS3args 1252 * 1253 * struct READDIRPLUS3args { 1254 * nfs_fh3 dir; 1255 * cookie3 cookie; 1256 * cookieverf3 cookieverf; 1257 * count3 dircount; 1258 * count3 maxcount; 1259 * }; 1260 */ 1261 static void encode_readdirplus3args(struct xdr_stream *xdr, 1262 const struct nfs3_readdirargs *args) 1263 { 1264 uint32_t dircount = args->count; 1265 uint32_t maxcount = args->count; 1266 __be32 *p; 1267 1268 encode_nfs_fh3(xdr, args->fh); 1269 1270 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4); 1271 p = xdr_encode_cookie3(p, args->cookie); 1272 p = xdr_encode_cookieverf3(p, args->verf); 1273 1274 /* 1275 * readdirplus: need dircount + buffer size. 1276 * We just make sure we make dircount big enough 1277 */ 1278 *p++ = cpu_to_be32(dircount); 1279 *p = cpu_to_be32(maxcount); 1280 } 1281 1282 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req, 1283 struct xdr_stream *xdr, 1284 const void *data) 1285 { 1286 const struct nfs3_readdirargs *args = data; 1287 1288 encode_readdirplus3args(xdr, args); 1289 rpc_prepare_reply_pages(req, args->pages, 0, args->count, 1290 NFS3_readdirres_sz - NFS3_pagepad_sz); 1291 } 1292 1293 /* 1294 * 3.3.21 COMMIT3args 1295 * 1296 * struct COMMIT3args { 1297 * nfs_fh3 file; 1298 * offset3 offset; 1299 * count3 count; 1300 * }; 1301 */ 1302 static void encode_commit3args(struct xdr_stream *xdr, 1303 const struct nfs_commitargs *args) 1304 { 1305 __be32 *p; 1306 1307 encode_nfs_fh3(xdr, args->fh); 1308 1309 p = xdr_reserve_space(xdr, 8 + 4); 1310 p = xdr_encode_hyper(p, args->offset); 1311 *p = cpu_to_be32(args->count); 1312 } 1313 1314 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req, 1315 struct xdr_stream *xdr, 1316 const void *data) 1317 { 1318 const struct nfs_commitargs *args = data; 1319 1320 encode_commit3args(xdr, args); 1321 } 1322 1323 #ifdef CONFIG_NFS_V3_ACL 1324 1325 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req, 1326 struct xdr_stream *xdr, 1327 const void *data) 1328 { 1329 const struct nfs3_getaclargs *args = data; 1330 1331 encode_nfs_fh3(xdr, args->fh); 1332 encode_uint32(xdr, args->mask); 1333 if (args->mask & (NFS_ACL | NFS_DFACL)) { 1334 rpc_prepare_reply_pages(req, args->pages, 0, 1335 NFSACL_MAXPAGES << PAGE_SHIFT, 1336 ACL3_getaclres_sz - NFS3_pagepad_sz); 1337 req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES; 1338 } 1339 } 1340 1341 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req, 1342 struct xdr_stream *xdr, 1343 const void *data) 1344 { 1345 const struct nfs3_setaclargs *args = data; 1346 unsigned int base; 1347 int error; 1348 1349 encode_nfs_fh3(xdr, NFS_FH(args->inode)); 1350 encode_uint32(xdr, args->mask); 1351 1352 base = req->rq_slen; 1353 if (args->npages != 0) 1354 xdr_write_pages(xdr, args->pages, 0, args->len); 1355 else 1356 xdr_reserve_space(xdr, args->len); 1357 1358 error = nfsacl_encode(xdr->buf, base, args->inode, 1359 (args->mask & NFS_ACL) ? 1360 args->acl_access : NULL, 1, 0); 1361 /* FIXME: this is just broken */ 1362 BUG_ON(error < 0); 1363 error = nfsacl_encode(xdr->buf, base + error, args->inode, 1364 (args->mask & NFS_DFACL) ? 1365 args->acl_default : NULL, 1, 1366 NFS_ACL_DEFAULT); 1367 BUG_ON(error < 0); 1368 } 1369 1370 #endif /* CONFIG_NFS_V3_ACL */ 1371 1372 /* 1373 * NFSv3 XDR decode functions 1374 * 1375 * NFSv3 result types are defined in section 3.3 of RFC 1813: 1376 * "NFS Version 3 Protocol Specification". 1377 */ 1378 1379 /* 1380 * 3.3.1 GETATTR3res 1381 * 1382 * struct GETATTR3resok { 1383 * fattr3 obj_attributes; 1384 * }; 1385 * 1386 * union GETATTR3res switch (nfsstat3 status) { 1387 * case NFS3_OK: 1388 * GETATTR3resok resok; 1389 * default: 1390 * void; 1391 * }; 1392 */ 1393 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req, 1394 struct xdr_stream *xdr, 1395 void *result) 1396 { 1397 enum nfs_stat status; 1398 int error; 1399 1400 error = decode_nfsstat3(xdr, &status); 1401 if (unlikely(error)) 1402 goto out; 1403 if (status != NFS3_OK) 1404 goto out_default; 1405 error = decode_fattr3(xdr, result, rpc_rqst_userns(req)); 1406 out: 1407 return error; 1408 out_default: 1409 return nfs3_stat_to_errno(status); 1410 } 1411 1412 /* 1413 * 3.3.2 SETATTR3res 1414 * 1415 * struct SETATTR3resok { 1416 * wcc_data obj_wcc; 1417 * }; 1418 * 1419 * struct SETATTR3resfail { 1420 * wcc_data obj_wcc; 1421 * }; 1422 * 1423 * union SETATTR3res switch (nfsstat3 status) { 1424 * case NFS3_OK: 1425 * SETATTR3resok resok; 1426 * default: 1427 * SETATTR3resfail resfail; 1428 * }; 1429 */ 1430 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req, 1431 struct xdr_stream *xdr, 1432 void *result) 1433 { 1434 enum nfs_stat status; 1435 int error; 1436 1437 error = decode_nfsstat3(xdr, &status); 1438 if (unlikely(error)) 1439 goto out; 1440 error = decode_wcc_data(xdr, result, rpc_rqst_userns(req)); 1441 if (unlikely(error)) 1442 goto out; 1443 if (status != NFS3_OK) 1444 goto out_status; 1445 out: 1446 return error; 1447 out_status: 1448 return nfs3_stat_to_errno(status); 1449 } 1450 1451 /* 1452 * 3.3.3 LOOKUP3res 1453 * 1454 * struct LOOKUP3resok { 1455 * nfs_fh3 object; 1456 * post_op_attr obj_attributes; 1457 * post_op_attr dir_attributes; 1458 * }; 1459 * 1460 * struct LOOKUP3resfail { 1461 * post_op_attr dir_attributes; 1462 * }; 1463 * 1464 * union LOOKUP3res switch (nfsstat3 status) { 1465 * case NFS3_OK: 1466 * LOOKUP3resok resok; 1467 * default: 1468 * LOOKUP3resfail resfail; 1469 * }; 1470 */ 1471 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req, 1472 struct xdr_stream *xdr, 1473 void *data) 1474 { 1475 struct user_namespace *userns = rpc_rqst_userns(req); 1476 struct nfs3_diropres *result = data; 1477 enum nfs_stat status; 1478 int error; 1479 1480 error = decode_nfsstat3(xdr, &status); 1481 if (unlikely(error)) 1482 goto out; 1483 if (status != NFS3_OK) 1484 goto out_default; 1485 error = decode_nfs_fh3(xdr, result->fh); 1486 if (unlikely(error)) 1487 goto out; 1488 error = decode_post_op_attr(xdr, result->fattr, userns); 1489 if (unlikely(error)) 1490 goto out; 1491 error = decode_post_op_attr(xdr, result->dir_attr, userns); 1492 out: 1493 return error; 1494 out_default: 1495 error = decode_post_op_attr(xdr, result->dir_attr, userns); 1496 if (unlikely(error)) 1497 goto out; 1498 return nfs3_stat_to_errno(status); 1499 } 1500 1501 /* 1502 * 3.3.4 ACCESS3res 1503 * 1504 * struct ACCESS3resok { 1505 * post_op_attr obj_attributes; 1506 * uint32 access; 1507 * }; 1508 * 1509 * struct ACCESS3resfail { 1510 * post_op_attr obj_attributes; 1511 * }; 1512 * 1513 * union ACCESS3res switch (nfsstat3 status) { 1514 * case NFS3_OK: 1515 * ACCESS3resok resok; 1516 * default: 1517 * ACCESS3resfail resfail; 1518 * }; 1519 */ 1520 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req, 1521 struct xdr_stream *xdr, 1522 void *data) 1523 { 1524 struct nfs3_accessres *result = data; 1525 enum nfs_stat status; 1526 int error; 1527 1528 error = decode_nfsstat3(xdr, &status); 1529 if (unlikely(error)) 1530 goto out; 1531 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req)); 1532 if (unlikely(error)) 1533 goto out; 1534 if (status != NFS3_OK) 1535 goto out_default; 1536 error = decode_uint32(xdr, &result->access); 1537 out: 1538 return error; 1539 out_default: 1540 return nfs3_stat_to_errno(status); 1541 } 1542 1543 /* 1544 * 3.3.5 READLINK3res 1545 * 1546 * struct READLINK3resok { 1547 * post_op_attr symlink_attributes; 1548 * nfspath3 data; 1549 * }; 1550 * 1551 * struct READLINK3resfail { 1552 * post_op_attr symlink_attributes; 1553 * }; 1554 * 1555 * union READLINK3res switch (nfsstat3 status) { 1556 * case NFS3_OK: 1557 * READLINK3resok resok; 1558 * default: 1559 * READLINK3resfail resfail; 1560 * }; 1561 */ 1562 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req, 1563 struct xdr_stream *xdr, 1564 void *result) 1565 { 1566 enum nfs_stat status; 1567 int error; 1568 1569 error = decode_nfsstat3(xdr, &status); 1570 if (unlikely(error)) 1571 goto out; 1572 error = decode_post_op_attr(xdr, result, rpc_rqst_userns(req)); 1573 if (unlikely(error)) 1574 goto out; 1575 if (status != NFS3_OK) 1576 goto out_default; 1577 error = decode_nfspath3(xdr); 1578 out: 1579 return error; 1580 out_default: 1581 return nfs3_stat_to_errno(status); 1582 } 1583 1584 /* 1585 * 3.3.6 READ3res 1586 * 1587 * struct READ3resok { 1588 * post_op_attr file_attributes; 1589 * count3 count; 1590 * bool eof; 1591 * opaque data<>; 1592 * }; 1593 * 1594 * struct READ3resfail { 1595 * post_op_attr file_attributes; 1596 * }; 1597 * 1598 * union READ3res switch (nfsstat3 status) { 1599 * case NFS3_OK: 1600 * READ3resok resok; 1601 * default: 1602 * READ3resfail resfail; 1603 * }; 1604 */ 1605 static int decode_read3resok(struct xdr_stream *xdr, 1606 struct nfs_pgio_res *result) 1607 { 1608 u32 eof, count, ocount, recvd; 1609 __be32 *p; 1610 1611 p = xdr_inline_decode(xdr, 4 + 4 + 4); 1612 if (unlikely(!p)) 1613 return -EIO; 1614 count = be32_to_cpup(p++); 1615 eof = be32_to_cpup(p++); 1616 ocount = be32_to_cpup(p++); 1617 if (unlikely(ocount != count)) 1618 goto out_mismatch; 1619 recvd = xdr_read_pages(xdr, count); 1620 if (unlikely(count > recvd)) 1621 goto out_cheating; 1622 out: 1623 result->eof = eof; 1624 result->count = count; 1625 return count; 1626 out_mismatch: 1627 dprintk("NFS: READ count doesn't match length of opaque: " 1628 "count %u != ocount %u\n", count, ocount); 1629 return -EIO; 1630 out_cheating: 1631 dprintk("NFS: server cheating in read result: " 1632 "count %u > recvd %u\n", count, recvd); 1633 count = recvd; 1634 eof = 0; 1635 goto out; 1636 } 1637 1638 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr, 1639 void *data) 1640 { 1641 struct nfs_pgio_res *result = data; 1642 unsigned int pos; 1643 enum nfs_stat status; 1644 int error; 1645 1646 pos = xdr_stream_pos(xdr); 1647 error = decode_nfsstat3(xdr, &status); 1648 if (unlikely(error)) 1649 goto out; 1650 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req)); 1651 if (unlikely(error)) 1652 goto out; 1653 result->op_status = status; 1654 if (status != NFS3_OK) 1655 goto out_status; 1656 result->replen = 3 + ((xdr_stream_pos(xdr) - pos) >> 2); 1657 error = decode_read3resok(xdr, result); 1658 out: 1659 return error; 1660 out_status: 1661 return nfs3_stat_to_errno(status); 1662 } 1663 1664 /* 1665 * 3.3.7 WRITE3res 1666 * 1667 * enum stable_how { 1668 * UNSTABLE = 0, 1669 * DATA_SYNC = 1, 1670 * FILE_SYNC = 2 1671 * }; 1672 * 1673 * struct WRITE3resok { 1674 * wcc_data file_wcc; 1675 * count3 count; 1676 * stable_how committed; 1677 * writeverf3 verf; 1678 * }; 1679 * 1680 * struct WRITE3resfail { 1681 * wcc_data file_wcc; 1682 * }; 1683 * 1684 * union WRITE3res switch (nfsstat3 status) { 1685 * case NFS3_OK: 1686 * WRITE3resok resok; 1687 * default: 1688 * WRITE3resfail resfail; 1689 * }; 1690 */ 1691 static int decode_write3resok(struct xdr_stream *xdr, 1692 struct nfs_pgio_res *result) 1693 { 1694 __be32 *p; 1695 1696 p = xdr_inline_decode(xdr, 4 + 4); 1697 if (unlikely(!p)) 1698 return -EIO; 1699 result->count = be32_to_cpup(p++); 1700 result->verf->committed = be32_to_cpup(p++); 1701 if (unlikely(result->verf->committed > NFS_FILE_SYNC)) 1702 goto out_badvalue; 1703 if (decode_writeverf3(xdr, &result->verf->verifier)) 1704 return -EIO; 1705 return result->count; 1706 out_badvalue: 1707 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed); 1708 return -EIO; 1709 } 1710 1711 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr, 1712 void *data) 1713 { 1714 struct nfs_pgio_res *result = data; 1715 enum nfs_stat status; 1716 int error; 1717 1718 error = decode_nfsstat3(xdr, &status); 1719 if (unlikely(error)) 1720 goto out; 1721 error = decode_wcc_data(xdr, result->fattr, rpc_rqst_userns(req)); 1722 if (unlikely(error)) 1723 goto out; 1724 result->op_status = status; 1725 if (status != NFS3_OK) 1726 goto out_status; 1727 error = decode_write3resok(xdr, result); 1728 out: 1729 return error; 1730 out_status: 1731 return nfs3_stat_to_errno(status); 1732 } 1733 1734 /* 1735 * 3.3.8 CREATE3res 1736 * 1737 * struct CREATE3resok { 1738 * post_op_fh3 obj; 1739 * post_op_attr obj_attributes; 1740 * wcc_data dir_wcc; 1741 * }; 1742 * 1743 * struct CREATE3resfail { 1744 * wcc_data dir_wcc; 1745 * }; 1746 * 1747 * union CREATE3res switch (nfsstat3 status) { 1748 * case NFS3_OK: 1749 * CREATE3resok resok; 1750 * default: 1751 * CREATE3resfail resfail; 1752 * }; 1753 */ 1754 static int decode_create3resok(struct xdr_stream *xdr, 1755 struct nfs3_diropres *result, 1756 struct user_namespace *userns) 1757 { 1758 int error; 1759 1760 error = decode_post_op_fh3(xdr, result->fh); 1761 if (unlikely(error)) 1762 goto out; 1763 error = decode_post_op_attr(xdr, result->fattr, userns); 1764 if (unlikely(error)) 1765 goto out; 1766 /* The server isn't required to return a file handle. 1767 * If it didn't, force the client to perform a LOOKUP 1768 * to determine the correct file handle and attribute 1769 * values for the new object. */ 1770 if (result->fh->size == 0) 1771 result->fattr->valid = 0; 1772 error = decode_wcc_data(xdr, result->dir_attr, userns); 1773 out: 1774 return error; 1775 } 1776 1777 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req, 1778 struct xdr_stream *xdr, 1779 void *data) 1780 { 1781 struct user_namespace *userns = rpc_rqst_userns(req); 1782 struct nfs3_diropres *result = data; 1783 enum nfs_stat status; 1784 int error; 1785 1786 error = decode_nfsstat3(xdr, &status); 1787 if (unlikely(error)) 1788 goto out; 1789 if (status != NFS3_OK) 1790 goto out_default; 1791 error = decode_create3resok(xdr, result, userns); 1792 out: 1793 return error; 1794 out_default: 1795 error = decode_wcc_data(xdr, result->dir_attr, userns); 1796 if (unlikely(error)) 1797 goto out; 1798 return nfs3_stat_to_errno(status); 1799 } 1800 1801 /* 1802 * 3.3.12 REMOVE3res 1803 * 1804 * struct REMOVE3resok { 1805 * wcc_data dir_wcc; 1806 * }; 1807 * 1808 * struct REMOVE3resfail { 1809 * wcc_data dir_wcc; 1810 * }; 1811 * 1812 * union REMOVE3res switch (nfsstat3 status) { 1813 * case NFS3_OK: 1814 * REMOVE3resok resok; 1815 * default: 1816 * REMOVE3resfail resfail; 1817 * }; 1818 */ 1819 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req, 1820 struct xdr_stream *xdr, 1821 void *data) 1822 { 1823 struct nfs_removeres *result = data; 1824 enum nfs_stat status; 1825 int error; 1826 1827 error = decode_nfsstat3(xdr, &status); 1828 if (unlikely(error)) 1829 goto out; 1830 error = decode_wcc_data(xdr, result->dir_attr, rpc_rqst_userns(req)); 1831 if (unlikely(error)) 1832 goto out; 1833 if (status != NFS3_OK) 1834 goto out_status; 1835 out: 1836 return error; 1837 out_status: 1838 return nfs3_stat_to_errno(status); 1839 } 1840 1841 /* 1842 * 3.3.14 RENAME3res 1843 * 1844 * struct RENAME3resok { 1845 * wcc_data fromdir_wcc; 1846 * wcc_data todir_wcc; 1847 * }; 1848 * 1849 * struct RENAME3resfail { 1850 * wcc_data fromdir_wcc; 1851 * wcc_data todir_wcc; 1852 * }; 1853 * 1854 * union RENAME3res switch (nfsstat3 status) { 1855 * case NFS3_OK: 1856 * RENAME3resok resok; 1857 * default: 1858 * RENAME3resfail resfail; 1859 * }; 1860 */ 1861 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req, 1862 struct xdr_stream *xdr, 1863 void *data) 1864 { 1865 struct user_namespace *userns = rpc_rqst_userns(req); 1866 struct nfs_renameres *result = data; 1867 enum nfs_stat status; 1868 int error; 1869 1870 error = decode_nfsstat3(xdr, &status); 1871 if (unlikely(error)) 1872 goto out; 1873 error = decode_wcc_data(xdr, result->old_fattr, userns); 1874 if (unlikely(error)) 1875 goto out; 1876 error = decode_wcc_data(xdr, result->new_fattr, userns); 1877 if (unlikely(error)) 1878 goto out; 1879 if (status != NFS3_OK) 1880 goto out_status; 1881 out: 1882 return error; 1883 out_status: 1884 return nfs3_stat_to_errno(status); 1885 } 1886 1887 /* 1888 * 3.3.15 LINK3res 1889 * 1890 * struct LINK3resok { 1891 * post_op_attr file_attributes; 1892 * wcc_data linkdir_wcc; 1893 * }; 1894 * 1895 * struct LINK3resfail { 1896 * post_op_attr file_attributes; 1897 * wcc_data linkdir_wcc; 1898 * }; 1899 * 1900 * union LINK3res switch (nfsstat3 status) { 1901 * case NFS3_OK: 1902 * LINK3resok resok; 1903 * default: 1904 * LINK3resfail resfail; 1905 * }; 1906 */ 1907 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr, 1908 void *data) 1909 { 1910 struct user_namespace *userns = rpc_rqst_userns(req); 1911 struct nfs3_linkres *result = data; 1912 enum nfs_stat status; 1913 int error; 1914 1915 error = decode_nfsstat3(xdr, &status); 1916 if (unlikely(error)) 1917 goto out; 1918 error = decode_post_op_attr(xdr, result->fattr, userns); 1919 if (unlikely(error)) 1920 goto out; 1921 error = decode_wcc_data(xdr, result->dir_attr, userns); 1922 if (unlikely(error)) 1923 goto out; 1924 if (status != NFS3_OK) 1925 goto out_status; 1926 out: 1927 return error; 1928 out_status: 1929 return nfs3_stat_to_errno(status); 1930 } 1931 1932 /** 1933 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in 1934 * the local page cache 1935 * @xdr: XDR stream where entry resides 1936 * @entry: buffer to fill in with entry data 1937 * @plus: boolean indicating whether this should be a readdirplus entry 1938 * 1939 * Returns zero if successful, otherwise a negative errno value is 1940 * returned. 1941 * 1942 * This function is not invoked during READDIR reply decoding, but 1943 * rather whenever an application invokes the getdents(2) system call 1944 * on a directory already in our cache. 1945 * 1946 * 3.3.16 entry3 1947 * 1948 * struct entry3 { 1949 * fileid3 fileid; 1950 * filename3 name; 1951 * cookie3 cookie; 1952 * fhandle3 filehandle; 1953 * post_op_attr3 attributes; 1954 * entry3 *nextentry; 1955 * }; 1956 * 1957 * 3.3.17 entryplus3 1958 * struct entryplus3 { 1959 * fileid3 fileid; 1960 * filename3 name; 1961 * cookie3 cookie; 1962 * post_op_attr name_attributes; 1963 * post_op_fh3 name_handle; 1964 * entryplus3 *nextentry; 1965 * }; 1966 */ 1967 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry, 1968 bool plus) 1969 { 1970 struct user_namespace *userns = rpc_userns(entry->server->client); 1971 __be32 *p; 1972 int error; 1973 u64 new_cookie; 1974 1975 p = xdr_inline_decode(xdr, 4); 1976 if (unlikely(!p)) 1977 return -EAGAIN; 1978 if (*p == xdr_zero) { 1979 p = xdr_inline_decode(xdr, 4); 1980 if (unlikely(!p)) 1981 return -EAGAIN; 1982 if (*p == xdr_zero) 1983 return -EAGAIN; 1984 entry->eof = 1; 1985 return -EBADCOOKIE; 1986 } 1987 1988 error = decode_fileid3(xdr, &entry->ino); 1989 if (unlikely(error)) 1990 return -EAGAIN; 1991 1992 error = decode_inline_filename3(xdr, &entry->name, &entry->len); 1993 if (unlikely(error)) 1994 return error == -ENAMETOOLONG ? -ENAMETOOLONG : -EAGAIN; 1995 1996 error = decode_cookie3(xdr, &new_cookie); 1997 if (unlikely(error)) 1998 return -EAGAIN; 1999 2000 entry->d_type = DT_UNKNOWN; 2001 2002 if (plus) { 2003 entry->fattr->valid = 0; 2004 error = decode_post_op_attr(xdr, entry->fattr, userns); 2005 if (unlikely(error)) 2006 return -EAGAIN; 2007 if (entry->fattr->valid & NFS_ATTR_FATTR_V3) 2008 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode); 2009 2010 if (entry->fattr->fileid != entry->ino) { 2011 entry->fattr->mounted_on_fileid = entry->ino; 2012 entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID; 2013 } 2014 2015 /* In fact, a post_op_fh3: */ 2016 p = xdr_inline_decode(xdr, 4); 2017 if (unlikely(!p)) 2018 return -EAGAIN; 2019 if (*p != xdr_zero) { 2020 error = decode_nfs_fh3(xdr, entry->fh); 2021 if (unlikely(error)) 2022 return -EAGAIN; 2023 } else 2024 zero_nfs_fh3(entry->fh); 2025 } 2026 2027 entry->cookie = new_cookie; 2028 2029 return 0; 2030 } 2031 2032 /* 2033 * 3.3.16 READDIR3res 2034 * 2035 * struct dirlist3 { 2036 * entry3 *entries; 2037 * bool eof; 2038 * }; 2039 * 2040 * struct READDIR3resok { 2041 * post_op_attr dir_attributes; 2042 * cookieverf3 cookieverf; 2043 * dirlist3 reply; 2044 * }; 2045 * 2046 * struct READDIR3resfail { 2047 * post_op_attr dir_attributes; 2048 * }; 2049 * 2050 * union READDIR3res switch (nfsstat3 status) { 2051 * case NFS3_OK: 2052 * READDIR3resok resok; 2053 * default: 2054 * READDIR3resfail resfail; 2055 * }; 2056 * 2057 * Read the directory contents into the page cache, but otherwise 2058 * don't touch them. The actual decoding is done by nfs3_decode_entry() 2059 * during subsequent nfs_readdir() calls. 2060 */ 2061 static int decode_dirlist3(struct xdr_stream *xdr) 2062 { 2063 return xdr_read_pages(xdr, xdr->buf->page_len); 2064 } 2065 2066 static int decode_readdir3resok(struct xdr_stream *xdr, 2067 struct nfs3_readdirres *result, 2068 struct user_namespace *userns) 2069 { 2070 int error; 2071 2072 error = decode_post_op_attr(xdr, result->dir_attr, userns); 2073 if (unlikely(error)) 2074 goto out; 2075 /* XXX: do we need to check if result->verf != NULL ? */ 2076 error = decode_cookieverf3(xdr, result->verf); 2077 if (unlikely(error)) 2078 goto out; 2079 error = decode_dirlist3(xdr); 2080 out: 2081 return error; 2082 } 2083 2084 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req, 2085 struct xdr_stream *xdr, 2086 void *data) 2087 { 2088 struct nfs3_readdirres *result = data; 2089 enum nfs_stat status; 2090 int error; 2091 2092 error = decode_nfsstat3(xdr, &status); 2093 if (unlikely(error)) 2094 goto out; 2095 if (status != NFS3_OK) 2096 goto out_default; 2097 error = decode_readdir3resok(xdr, result, rpc_rqst_userns(req)); 2098 out: 2099 return error; 2100 out_default: 2101 error = decode_post_op_attr(xdr, result->dir_attr, rpc_rqst_userns(req)); 2102 if (unlikely(error)) 2103 goto out; 2104 return nfs3_stat_to_errno(status); 2105 } 2106 2107 /* 2108 * 3.3.18 FSSTAT3res 2109 * 2110 * struct FSSTAT3resok { 2111 * post_op_attr obj_attributes; 2112 * size3 tbytes; 2113 * size3 fbytes; 2114 * size3 abytes; 2115 * size3 tfiles; 2116 * size3 ffiles; 2117 * size3 afiles; 2118 * uint32 invarsec; 2119 * }; 2120 * 2121 * struct FSSTAT3resfail { 2122 * post_op_attr obj_attributes; 2123 * }; 2124 * 2125 * union FSSTAT3res switch (nfsstat3 status) { 2126 * case NFS3_OK: 2127 * FSSTAT3resok resok; 2128 * default: 2129 * FSSTAT3resfail resfail; 2130 * }; 2131 */ 2132 static int decode_fsstat3resok(struct xdr_stream *xdr, 2133 struct nfs_fsstat *result) 2134 { 2135 __be32 *p; 2136 2137 p = xdr_inline_decode(xdr, 8 * 6 + 4); 2138 if (unlikely(!p)) 2139 return -EIO; 2140 p = xdr_decode_size3(p, &result->tbytes); 2141 p = xdr_decode_size3(p, &result->fbytes); 2142 p = xdr_decode_size3(p, &result->abytes); 2143 p = xdr_decode_size3(p, &result->tfiles); 2144 p = xdr_decode_size3(p, &result->ffiles); 2145 xdr_decode_size3(p, &result->afiles); 2146 /* ignore invarsec */ 2147 return 0; 2148 } 2149 2150 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req, 2151 struct xdr_stream *xdr, 2152 void *data) 2153 { 2154 struct nfs_fsstat *result = data; 2155 enum nfs_stat status; 2156 int error; 2157 2158 error = decode_nfsstat3(xdr, &status); 2159 if (unlikely(error)) 2160 goto out; 2161 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req)); 2162 if (unlikely(error)) 2163 goto out; 2164 if (status != NFS3_OK) 2165 goto out_status; 2166 error = decode_fsstat3resok(xdr, result); 2167 out: 2168 return error; 2169 out_status: 2170 return nfs3_stat_to_errno(status); 2171 } 2172 2173 /* 2174 * 3.3.19 FSINFO3res 2175 * 2176 * struct FSINFO3resok { 2177 * post_op_attr obj_attributes; 2178 * uint32 rtmax; 2179 * uint32 rtpref; 2180 * uint32 rtmult; 2181 * uint32 wtmax; 2182 * uint32 wtpref; 2183 * uint32 wtmult; 2184 * uint32 dtpref; 2185 * size3 maxfilesize; 2186 * nfstime3 time_delta; 2187 * uint32 properties; 2188 * }; 2189 * 2190 * struct FSINFO3resfail { 2191 * post_op_attr obj_attributes; 2192 * }; 2193 * 2194 * union FSINFO3res switch (nfsstat3 status) { 2195 * case NFS3_OK: 2196 * FSINFO3resok resok; 2197 * default: 2198 * FSINFO3resfail resfail; 2199 * }; 2200 */ 2201 static int decode_fsinfo3resok(struct xdr_stream *xdr, 2202 struct nfs_fsinfo *result) 2203 { 2204 __be32 *p; 2205 2206 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4); 2207 if (unlikely(!p)) 2208 return -EIO; 2209 result->rtmax = be32_to_cpup(p++); 2210 result->rtpref = be32_to_cpup(p++); 2211 result->rtmult = be32_to_cpup(p++); 2212 result->wtmax = be32_to_cpup(p++); 2213 result->wtpref = be32_to_cpup(p++); 2214 result->wtmult = be32_to_cpup(p++); 2215 result->dtpref = be32_to_cpup(p++); 2216 p = xdr_decode_size3(p, &result->maxfilesize); 2217 xdr_decode_nfstime3(p, &result->time_delta); 2218 2219 /* ignore properties */ 2220 result->lease_time = 0; 2221 result->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; 2222 result->xattr_support = 0; 2223 return 0; 2224 } 2225 2226 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req, 2227 struct xdr_stream *xdr, 2228 void *data) 2229 { 2230 struct nfs_fsinfo *result = data; 2231 enum nfs_stat status; 2232 int error; 2233 2234 error = decode_nfsstat3(xdr, &status); 2235 if (unlikely(error)) 2236 goto out; 2237 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req)); 2238 if (unlikely(error)) 2239 goto out; 2240 if (status != NFS3_OK) 2241 goto out_status; 2242 error = decode_fsinfo3resok(xdr, result); 2243 out: 2244 return error; 2245 out_status: 2246 return nfs3_stat_to_errno(status); 2247 } 2248 2249 /* 2250 * 3.3.20 PATHCONF3res 2251 * 2252 * struct PATHCONF3resok { 2253 * post_op_attr obj_attributes; 2254 * uint32 linkmax; 2255 * uint32 name_max; 2256 * bool no_trunc; 2257 * bool chown_restricted; 2258 * bool case_insensitive; 2259 * bool case_preserving; 2260 * }; 2261 * 2262 * struct PATHCONF3resfail { 2263 * post_op_attr obj_attributes; 2264 * }; 2265 * 2266 * union PATHCONF3res switch (nfsstat3 status) { 2267 * case NFS3_OK: 2268 * PATHCONF3resok resok; 2269 * default: 2270 * PATHCONF3resfail resfail; 2271 * }; 2272 */ 2273 static int decode_pathconf3resok(struct xdr_stream *xdr, 2274 struct nfs_pathconf *result) 2275 { 2276 __be32 *p; 2277 2278 p = xdr_inline_decode(xdr, 4 * 6); 2279 if (unlikely(!p)) 2280 return -EIO; 2281 result->max_link = be32_to_cpup(p++); 2282 result->max_namelen = be32_to_cpup(p); 2283 /* ignore remaining fields */ 2284 return 0; 2285 } 2286 2287 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req, 2288 struct xdr_stream *xdr, 2289 void *data) 2290 { 2291 struct nfs_pathconf *result = data; 2292 enum nfs_stat status; 2293 int error; 2294 2295 error = decode_nfsstat3(xdr, &status); 2296 if (unlikely(error)) 2297 goto out; 2298 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req)); 2299 if (unlikely(error)) 2300 goto out; 2301 if (status != NFS3_OK) 2302 goto out_status; 2303 error = decode_pathconf3resok(xdr, result); 2304 out: 2305 return error; 2306 out_status: 2307 return nfs3_stat_to_errno(status); 2308 } 2309 2310 /* 2311 * 3.3.21 COMMIT3res 2312 * 2313 * struct COMMIT3resok { 2314 * wcc_data file_wcc; 2315 * writeverf3 verf; 2316 * }; 2317 * 2318 * struct COMMIT3resfail { 2319 * wcc_data file_wcc; 2320 * }; 2321 * 2322 * union COMMIT3res switch (nfsstat3 status) { 2323 * case NFS3_OK: 2324 * COMMIT3resok resok; 2325 * default: 2326 * COMMIT3resfail resfail; 2327 * }; 2328 */ 2329 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req, 2330 struct xdr_stream *xdr, 2331 void *data) 2332 { 2333 struct nfs_commitres *result = data; 2334 struct nfs_writeverf *verf = result->verf; 2335 enum nfs_stat status; 2336 int error; 2337 2338 error = decode_nfsstat3(xdr, &status); 2339 if (unlikely(error)) 2340 goto out; 2341 error = decode_wcc_data(xdr, result->fattr, rpc_rqst_userns(req)); 2342 if (unlikely(error)) 2343 goto out; 2344 result->op_status = status; 2345 if (status != NFS3_OK) 2346 goto out_status; 2347 error = decode_writeverf3(xdr, &verf->verifier); 2348 if (!error) 2349 verf->committed = NFS_FILE_SYNC; 2350 out: 2351 return error; 2352 out_status: 2353 return nfs3_stat_to_errno(status); 2354 } 2355 2356 #ifdef CONFIG_NFS_V3_ACL 2357 2358 static inline int decode_getacl3resok(struct xdr_stream *xdr, 2359 struct nfs3_getaclres *result, 2360 struct user_namespace *userns) 2361 { 2362 struct posix_acl **acl; 2363 unsigned int *aclcnt; 2364 size_t hdrlen; 2365 int error; 2366 2367 error = decode_post_op_attr(xdr, result->fattr, userns); 2368 if (unlikely(error)) 2369 goto out; 2370 error = decode_uint32(xdr, &result->mask); 2371 if (unlikely(error)) 2372 goto out; 2373 error = -EINVAL; 2374 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT)) 2375 goto out; 2376 2377 hdrlen = xdr_stream_pos(xdr); 2378 2379 acl = NULL; 2380 if (result->mask & NFS_ACL) 2381 acl = &result->acl_access; 2382 aclcnt = NULL; 2383 if (result->mask & NFS_ACLCNT) 2384 aclcnt = &result->acl_access_count; 2385 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl); 2386 if (unlikely(error <= 0)) 2387 goto out; 2388 2389 acl = NULL; 2390 if (result->mask & NFS_DFACL) 2391 acl = &result->acl_default; 2392 aclcnt = NULL; 2393 if (result->mask & NFS_DFACLCNT) 2394 aclcnt = &result->acl_default_count; 2395 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl); 2396 if (unlikely(error <= 0)) 2397 return error; 2398 error = 0; 2399 out: 2400 return error; 2401 } 2402 2403 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req, 2404 struct xdr_stream *xdr, 2405 void *result) 2406 { 2407 enum nfs_stat status; 2408 int error; 2409 2410 error = decode_nfsstat3(xdr, &status); 2411 if (unlikely(error)) 2412 goto out; 2413 if (status != NFS3_OK) 2414 goto out_default; 2415 error = decode_getacl3resok(xdr, result, rpc_rqst_userns(req)); 2416 out: 2417 return error; 2418 out_default: 2419 return nfs3_stat_to_errno(status); 2420 } 2421 2422 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req, 2423 struct xdr_stream *xdr, 2424 void *result) 2425 { 2426 enum nfs_stat status; 2427 int error; 2428 2429 error = decode_nfsstat3(xdr, &status); 2430 if (unlikely(error)) 2431 goto out; 2432 if (status != NFS3_OK) 2433 goto out_default; 2434 error = decode_post_op_attr(xdr, result, rpc_rqst_userns(req)); 2435 out: 2436 return error; 2437 out_default: 2438 return nfs3_stat_to_errno(status); 2439 } 2440 2441 #endif /* CONFIG_NFS_V3_ACL */ 2442 2443 2444 /* 2445 * We need to translate between nfs status return values and 2446 * the local errno values which may not be the same. 2447 */ 2448 static const struct { 2449 int stat; 2450 int errno; 2451 } nfs_errtbl[] = { 2452 { NFS_OK, 0 }, 2453 { NFSERR_PERM, -EPERM }, 2454 { NFSERR_NOENT, -ENOENT }, 2455 { NFSERR_IO, -errno_NFSERR_IO}, 2456 { NFSERR_NXIO, -ENXIO }, 2457 /* { NFSERR_EAGAIN, -EAGAIN }, */ 2458 { NFSERR_ACCES, -EACCES }, 2459 { NFSERR_EXIST, -EEXIST }, 2460 { NFSERR_XDEV, -EXDEV }, 2461 { NFSERR_NODEV, -ENODEV }, 2462 { NFSERR_NOTDIR, -ENOTDIR }, 2463 { NFSERR_ISDIR, -EISDIR }, 2464 { NFSERR_INVAL, -EINVAL }, 2465 { NFSERR_FBIG, -EFBIG }, 2466 { NFSERR_NOSPC, -ENOSPC }, 2467 { NFSERR_ROFS, -EROFS }, 2468 { NFSERR_MLINK, -EMLINK }, 2469 { NFSERR_NAMETOOLONG, -ENAMETOOLONG }, 2470 { NFSERR_NOTEMPTY, -ENOTEMPTY }, 2471 { NFSERR_DQUOT, -EDQUOT }, 2472 { NFSERR_STALE, -ESTALE }, 2473 { NFSERR_REMOTE, -EREMOTE }, 2474 #ifdef EWFLUSH 2475 { NFSERR_WFLUSH, -EWFLUSH }, 2476 #endif 2477 { NFSERR_BADHANDLE, -EBADHANDLE }, 2478 { NFSERR_NOT_SYNC, -ENOTSYNC }, 2479 { NFSERR_BAD_COOKIE, -EBADCOOKIE }, 2480 { NFSERR_NOTSUPP, -ENOTSUPP }, 2481 { NFSERR_TOOSMALL, -ETOOSMALL }, 2482 { NFSERR_SERVERFAULT, -EREMOTEIO }, 2483 { NFSERR_BADTYPE, -EBADTYPE }, 2484 { NFSERR_JUKEBOX, -EJUKEBOX }, 2485 { -1, -EIO } 2486 }; 2487 2488 /** 2489 * nfs3_stat_to_errno - convert an NFS status code to a local errno 2490 * @status: NFS status code to convert 2491 * 2492 * Returns a local errno value, or -EIO if the NFS status code is 2493 * not recognized. This function is used jointly by NFSv2 and NFSv3. 2494 */ 2495 static int nfs3_stat_to_errno(enum nfs_stat status) 2496 { 2497 int i; 2498 2499 for (i = 0; nfs_errtbl[i].stat != -1; i++) { 2500 if (nfs_errtbl[i].stat == (int)status) 2501 return nfs_errtbl[i].errno; 2502 } 2503 dprintk("NFS: Unrecognized nfs status value: %u\n", status); 2504 return nfs_errtbl[i].errno; 2505 } 2506 2507 2508 #define PROC(proc, argtype, restype, timer) \ 2509 [NFS3PROC_##proc] = { \ 2510 .p_proc = NFS3PROC_##proc, \ 2511 .p_encode = nfs3_xdr_enc_##argtype##3args, \ 2512 .p_decode = nfs3_xdr_dec_##restype##3res, \ 2513 .p_arglen = NFS3_##argtype##args_sz, \ 2514 .p_replen = NFS3_##restype##res_sz, \ 2515 .p_timer = timer, \ 2516 .p_statidx = NFS3PROC_##proc, \ 2517 .p_name = #proc, \ 2518 } 2519 2520 const struct rpc_procinfo nfs3_procedures[] = { 2521 PROC(GETATTR, getattr, getattr, 1), 2522 PROC(SETATTR, setattr, setattr, 0), 2523 PROC(LOOKUP, lookup, lookup, 2), 2524 PROC(ACCESS, access, access, 1), 2525 PROC(READLINK, readlink, readlink, 3), 2526 PROC(READ, read, read, 3), 2527 PROC(WRITE, write, write, 4), 2528 PROC(CREATE, create, create, 0), 2529 PROC(MKDIR, mkdir, create, 0), 2530 PROC(SYMLINK, symlink, create, 0), 2531 PROC(MKNOD, mknod, create, 0), 2532 PROC(REMOVE, remove, remove, 0), 2533 PROC(RMDIR, lookup, setattr, 0), 2534 PROC(RENAME, rename, rename, 0), 2535 PROC(LINK, link, link, 0), 2536 PROC(READDIR, readdir, readdir, 3), 2537 PROC(READDIRPLUS, readdirplus, readdir, 3), 2538 PROC(FSSTAT, getattr, fsstat, 0), 2539 PROC(FSINFO, getattr, fsinfo, 0), 2540 PROC(PATHCONF, getattr, pathconf, 0), 2541 PROC(COMMIT, commit, commit, 5), 2542 }; 2543 2544 static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)]; 2545 const struct rpc_version nfs_version3 = { 2546 .number = 3, 2547 .nrprocs = ARRAY_SIZE(nfs3_procedures), 2548 .procs = nfs3_procedures, 2549 .counts = nfs_version3_counts, 2550 }; 2551 2552 #ifdef CONFIG_NFS_V3_ACL 2553 static const struct rpc_procinfo nfs3_acl_procedures[] = { 2554 [ACLPROC3_GETACL] = { 2555 .p_proc = ACLPROC3_GETACL, 2556 .p_encode = nfs3_xdr_enc_getacl3args, 2557 .p_decode = nfs3_xdr_dec_getacl3res, 2558 .p_arglen = ACL3_getaclargs_sz, 2559 .p_replen = ACL3_getaclres_sz, 2560 .p_timer = 1, 2561 .p_name = "GETACL", 2562 }, 2563 [ACLPROC3_SETACL] = { 2564 .p_proc = ACLPROC3_SETACL, 2565 .p_encode = nfs3_xdr_enc_setacl3args, 2566 .p_decode = nfs3_xdr_dec_setacl3res, 2567 .p_arglen = ACL3_setaclargs_sz, 2568 .p_replen = ACL3_setaclres_sz, 2569 .p_timer = 0, 2570 .p_name = "SETACL", 2571 }, 2572 }; 2573 2574 static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)]; 2575 const struct rpc_version nfsacl_version3 = { 2576 .number = 3, 2577 .nrprocs = ARRAY_SIZE(nfs3_acl_procedures), 2578 .procs = nfs3_acl_procedures, 2579 .counts = nfs3_acl_counts, 2580 }; 2581 #endif /* CONFIG_NFS_V3_ACL */ 2582