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