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 "internal.h" 25 26 #define NFSDBG_FACILITY NFSDBG_XDR 27 28 /* Mapping from NFS error code to "errno" error code. */ 29 #define errno_NFSERR_IO EIO 30 31 /* 32 * Declare the space requirements for NFS arguments and replies as 33 * number of 32bit-words 34 */ 35 #define NFS3_fhandle_sz (1+16) 36 #define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */ 37 #define NFS3_sattr_sz (15) 38 #define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2)) 39 #define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2)) 40 #define NFS3_fattr_sz (21) 41 #define NFS3_cookieverf_sz (NFS3_COOKIEVERFSIZE>>2) 42 #define NFS3_wcc_attr_sz (6) 43 #define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz) 44 #define NFS3_post_op_attr_sz (1+NFS3_fattr_sz) 45 #define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz) 46 #define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz) 47 48 #define NFS3_getattrargs_sz (NFS3_fh_sz) 49 #define NFS3_setattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3) 50 #define NFS3_lookupargs_sz (NFS3_fh_sz+NFS3_filename_sz) 51 #define NFS3_accessargs_sz (NFS3_fh_sz+1) 52 #define NFS3_readlinkargs_sz (NFS3_fh_sz) 53 #define NFS3_readargs_sz (NFS3_fh_sz+3) 54 #define NFS3_writeargs_sz (NFS3_fh_sz+5) 55 #define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz) 56 #define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz) 57 #define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz) 58 #define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz) 59 #define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz) 60 #define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz) 61 #define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz) 62 #define NFS3_readdirargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+3) 63 #define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4) 64 #define NFS3_commitargs_sz (NFS3_fh_sz+3) 65 66 #define NFS3_getattrres_sz (1+NFS3_fattr_sz) 67 #define NFS3_setattrres_sz (1+NFS3_wcc_data_sz) 68 #define NFS3_removeres_sz (NFS3_setattrres_sz) 69 #define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz)) 70 #define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1) 71 #define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1) 72 #define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3) 73 #define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4) 74 #define NFS3_createres_sz (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz) 75 #define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz)) 76 #define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz) 77 #define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2) 78 #define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13) 79 #define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12) 80 #define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6) 81 #define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2) 82 83 #define ACL3_getaclargs_sz (NFS3_fh_sz+1) 84 #define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \ 85 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)) 86 #define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \ 87 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)) 88 #define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz) 89 90 static int nfs3_stat_to_errno(enum nfs_stat); 91 92 /* 93 * Map file type to S_IFMT bits 94 */ 95 static const umode_t nfs_type2fmt[] = { 96 [NF3BAD] = 0, 97 [NF3REG] = S_IFREG, 98 [NF3DIR] = S_IFDIR, 99 [NF3BLK] = S_IFBLK, 100 [NF3CHR] = S_IFCHR, 101 [NF3LNK] = S_IFLNK, 102 [NF3SOCK] = S_IFSOCK, 103 [NF3FIFO] = S_IFIFO, 104 }; 105 106 /* 107 * While encoding arguments, set up the reply buffer in advance to 108 * receive reply data directly into the page cache. 109 */ 110 static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages, 111 unsigned int base, unsigned int len, 112 unsigned int bufsize) 113 { 114 struct rpc_auth *auth = req->rq_cred->cr_auth; 115 unsigned int replen; 116 117 replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize; 118 xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len); 119 } 120 121 /* 122 * Handle decode buffer overflows out-of-line. 123 */ 124 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr) 125 { 126 dprintk("NFS: %s prematurely hit the end of our receive buffer. " 127 "Remaining buffer length is %tu words.\n", 128 func, xdr->end - xdr->p); 129 } 130 131 132 /* 133 * Encode/decode NFSv3 basic data types 134 * 135 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813: 136 * "NFS Version 3 Protocol Specification". 137 * 138 * Not all basic data types have their own encoding and decoding 139 * functions. For run-time efficiency, some data types are encoded 140 * or decoded inline. 141 */ 142 143 static void encode_uint32(struct xdr_stream *xdr, u32 value) 144 { 145 __be32 *p = xdr_reserve_space(xdr, 4); 146 *p = cpu_to_be32(value); 147 } 148 149 static int decode_uint32(struct xdr_stream *xdr, u32 *value) 150 { 151 __be32 *p; 152 153 p = xdr_inline_decode(xdr, 4); 154 if (unlikely(p == NULL)) 155 goto out_overflow; 156 *value = be32_to_cpup(p); 157 return 0; 158 out_overflow: 159 print_overflow_msg(__func__, xdr); 160 return -EIO; 161 } 162 163 static int decode_uint64(struct xdr_stream *xdr, u64 *value) 164 { 165 __be32 *p; 166 167 p = xdr_inline_decode(xdr, 8); 168 if (unlikely(p == NULL)) 169 goto out_overflow; 170 xdr_decode_hyper(p, value); 171 return 0; 172 out_overflow: 173 print_overflow_msg(__func__, xdr); 174 return -EIO; 175 } 176 177 /* 178 * fileid3 179 * 180 * typedef uint64 fileid3; 181 */ 182 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid) 183 { 184 return xdr_decode_hyper(p, fileid); 185 } 186 187 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid) 188 { 189 return decode_uint64(xdr, fileid); 190 } 191 192 /* 193 * filename3 194 * 195 * typedef string filename3<>; 196 */ 197 static void encode_filename3(struct xdr_stream *xdr, 198 const char *name, u32 length) 199 { 200 __be32 *p; 201 202 WARN_ON_ONCE(length > NFS3_MAXNAMLEN); 203 p = xdr_reserve_space(xdr, 4 + length); 204 xdr_encode_opaque(p, name, length); 205 } 206 207 static int decode_inline_filename3(struct xdr_stream *xdr, 208 const char **name, u32 *length) 209 { 210 __be32 *p; 211 u32 count; 212 213 p = xdr_inline_decode(xdr, 4); 214 if (unlikely(p == NULL)) 215 goto out_overflow; 216 count = be32_to_cpup(p); 217 if (count > NFS3_MAXNAMLEN) 218 goto out_nametoolong; 219 p = xdr_inline_decode(xdr, count); 220 if (unlikely(p == NULL)) 221 goto out_overflow; 222 *name = (const char *)p; 223 *length = count; 224 return 0; 225 226 out_nametoolong: 227 dprintk("NFS: returned filename too long: %u\n", count); 228 return -ENAMETOOLONG; 229 out_overflow: 230 print_overflow_msg(__func__, xdr); 231 return -EIO; 232 } 233 234 /* 235 * nfspath3 236 * 237 * typedef string nfspath3<>; 238 */ 239 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages, 240 const u32 length) 241 { 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, struct nfs_write_verifier *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->data, 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 encode_uint32(xdr, type); 392 } 393 394 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode) 395 { 396 u32 type; 397 398 type = be32_to_cpup(p++); 399 if (type > NF3FIFO) 400 type = NF3NON; 401 *mode = nfs_type2fmt[type]; 402 return p; 403 } 404 405 /* 406 * specdata3 407 * 408 * struct specdata3 { 409 * uint32 specdata1; 410 * uint32 specdata2; 411 * }; 412 */ 413 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev) 414 { 415 __be32 *p; 416 417 p = xdr_reserve_space(xdr, 8); 418 *p++ = cpu_to_be32(MAJOR(rdev)); 419 *p = cpu_to_be32(MINOR(rdev)); 420 } 421 422 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev) 423 { 424 unsigned int major, minor; 425 426 major = be32_to_cpup(p++); 427 minor = be32_to_cpup(p++); 428 *rdev = MKDEV(major, minor); 429 if (MAJOR(*rdev) != major || MINOR(*rdev) != minor) 430 *rdev = 0; 431 return p; 432 } 433 434 /* 435 * nfs_fh3 436 * 437 * struct nfs_fh3 { 438 * opaque data<NFS3_FHSIZE>; 439 * }; 440 */ 441 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh) 442 { 443 __be32 *p; 444 445 WARN_ON_ONCE(fh->size > NFS3_FHSIZE); 446 p = xdr_reserve_space(xdr, 4 + fh->size); 447 xdr_encode_opaque(p, fh->data, fh->size); 448 } 449 450 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh) 451 { 452 u32 length; 453 __be32 *p; 454 455 p = xdr_inline_decode(xdr, 4); 456 if (unlikely(p == NULL)) 457 goto out_overflow; 458 length = be32_to_cpup(p++); 459 if (unlikely(length > NFS3_FHSIZE)) 460 goto out_toobig; 461 p = xdr_inline_decode(xdr, length); 462 if (unlikely(p == NULL)) 463 goto out_overflow; 464 fh->size = length; 465 memcpy(fh->data, p, length); 466 return 0; 467 out_toobig: 468 dprintk("NFS: file handle size (%u) too big\n", length); 469 return -E2BIG; 470 out_overflow: 471 print_overflow_msg(__func__, xdr); 472 return -EIO; 473 } 474 475 static void zero_nfs_fh3(struct nfs_fh *fh) 476 { 477 memset(fh, 0, sizeof(*fh)); 478 } 479 480 /* 481 * nfstime3 482 * 483 * struct nfstime3 { 484 * uint32 seconds; 485 * uint32 nseconds; 486 * }; 487 */ 488 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep) 489 { 490 *p++ = cpu_to_be32(timep->tv_sec); 491 *p++ = cpu_to_be32(timep->tv_nsec); 492 return p; 493 } 494 495 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep) 496 { 497 timep->tv_sec = be32_to_cpup(p++); 498 timep->tv_nsec = be32_to_cpup(p++); 499 return p; 500 } 501 502 /* 503 * sattr3 504 * 505 * enum time_how { 506 * DONT_CHANGE = 0, 507 * SET_TO_SERVER_TIME = 1, 508 * SET_TO_CLIENT_TIME = 2 509 * }; 510 * 511 * union set_mode3 switch (bool set_it) { 512 * case TRUE: 513 * mode3 mode; 514 * default: 515 * void; 516 * }; 517 * 518 * union set_uid3 switch (bool set_it) { 519 * case TRUE: 520 * uid3 uid; 521 * default: 522 * void; 523 * }; 524 * 525 * union set_gid3 switch (bool set_it) { 526 * case TRUE: 527 * gid3 gid; 528 * default: 529 * void; 530 * }; 531 * 532 * union set_size3 switch (bool set_it) { 533 * case TRUE: 534 * size3 size; 535 * default: 536 * void; 537 * }; 538 * 539 * union set_atime switch (time_how set_it) { 540 * case SET_TO_CLIENT_TIME: 541 * nfstime3 atime; 542 * default: 543 * void; 544 * }; 545 * 546 * union set_mtime switch (time_how set_it) { 547 * case SET_TO_CLIENT_TIME: 548 * nfstime3 mtime; 549 * default: 550 * void; 551 * }; 552 * 553 * struct sattr3 { 554 * set_mode3 mode; 555 * set_uid3 uid; 556 * set_gid3 gid; 557 * set_size3 size; 558 * set_atime atime; 559 * set_mtime mtime; 560 * }; 561 */ 562 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr) 563 { 564 struct timespec ts; 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(from_kuid(&init_user_ns, 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(from_kgid(&init_user_ns, 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 struct timespec ts; 615 *p++ = xdr_two; 616 ts = timespec64_to_timespec(attr->ia_atime); 617 p = xdr_encode_nfstime3(p, &ts); 618 } else if (attr->ia_valid & ATTR_ATIME) { 619 *p++ = xdr_one; 620 } else 621 *p++ = xdr_zero; 622 623 if (attr->ia_valid & ATTR_MTIME_SET) { 624 *p++ = xdr_two; 625 ts = timespec64_to_timespec(attr->ia_mtime); 626 xdr_encode_nfstime3(p, &ts); 627 } else if (attr->ia_valid & ATTR_MTIME) { 628 *p = xdr_one; 629 } else 630 *p = xdr_zero; 631 } 632 633 /* 634 * fattr3 635 * 636 * struct fattr3 { 637 * ftype3 type; 638 * mode3 mode; 639 * uint32 nlink; 640 * uid3 uid; 641 * gid3 gid; 642 * size3 size; 643 * size3 used; 644 * specdata3 rdev; 645 * uint64 fsid; 646 * fileid3 fileid; 647 * nfstime3 atime; 648 * nfstime3 mtime; 649 * nfstime3 ctime; 650 * }; 651 */ 652 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr) 653 { 654 umode_t fmode; 655 __be32 *p; 656 657 p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2); 658 if (unlikely(p == NULL)) 659 goto out_overflow; 660 661 p = xdr_decode_ftype3(p, &fmode); 662 663 fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode; 664 fattr->nlink = be32_to_cpup(p++); 665 fattr->uid = make_kuid(&init_user_ns, be32_to_cpup(p++)); 666 if (!uid_valid(fattr->uid)) 667 goto out_uid; 668 fattr->gid = make_kgid(&init_user_ns, be32_to_cpup(p++)); 669 if (!gid_valid(fattr->gid)) 670 goto out_gid; 671 672 p = xdr_decode_size3(p, &fattr->size); 673 p = xdr_decode_size3(p, &fattr->du.nfs3.used); 674 p = xdr_decode_specdata3(p, &fattr->rdev); 675 676 p = xdr_decode_hyper(p, &fattr->fsid.major); 677 fattr->fsid.minor = 0; 678 679 p = xdr_decode_fileid3(p, &fattr->fileid); 680 p = xdr_decode_nfstime3(p, &fattr->atime); 681 p = xdr_decode_nfstime3(p, &fattr->mtime); 682 xdr_decode_nfstime3(p, &fattr->ctime); 683 fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime); 684 685 fattr->valid |= NFS_ATTR_FATTR_V3; 686 return 0; 687 out_uid: 688 dprintk("NFS: returned invalid uid\n"); 689 return -EINVAL; 690 out_gid: 691 dprintk("NFS: returned invalid gid\n"); 692 return -EINVAL; 693 out_overflow: 694 print_overflow_msg(__func__, xdr); 695 return -EIO; 696 } 697 698 /* 699 * post_op_attr 700 * 701 * union post_op_attr switch (bool attributes_follow) { 702 * case TRUE: 703 * fattr3 attributes; 704 * case FALSE: 705 * void; 706 * }; 707 */ 708 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr) 709 { 710 __be32 *p; 711 712 p = xdr_inline_decode(xdr, 4); 713 if (unlikely(p == NULL)) 714 goto out_overflow; 715 if (*p != xdr_zero) 716 return decode_fattr3(xdr, fattr); 717 return 0; 718 out_overflow: 719 print_overflow_msg(__func__, xdr); 720 return -EIO; 721 } 722 723 /* 724 * wcc_attr 725 * struct wcc_attr { 726 * size3 size; 727 * nfstime3 mtime; 728 * nfstime3 ctime; 729 * }; 730 */ 731 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr) 732 { 733 __be32 *p; 734 735 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2); 736 if (unlikely(p == NULL)) 737 goto out_overflow; 738 739 fattr->valid |= NFS_ATTR_FATTR_PRESIZE 740 | NFS_ATTR_FATTR_PRECHANGE 741 | NFS_ATTR_FATTR_PREMTIME 742 | NFS_ATTR_FATTR_PRECTIME; 743 744 p = xdr_decode_size3(p, &fattr->pre_size); 745 p = xdr_decode_nfstime3(p, &fattr->pre_mtime); 746 xdr_decode_nfstime3(p, &fattr->pre_ctime); 747 fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime); 748 749 return 0; 750 out_overflow: 751 print_overflow_msg(__func__, xdr); 752 return -EIO; 753 } 754 755 /* 756 * pre_op_attr 757 * union pre_op_attr switch (bool attributes_follow) { 758 * case TRUE: 759 * wcc_attr attributes; 760 * case FALSE: 761 * void; 762 * }; 763 * 764 * wcc_data 765 * 766 * struct wcc_data { 767 * pre_op_attr before; 768 * post_op_attr after; 769 * }; 770 */ 771 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr) 772 { 773 __be32 *p; 774 775 p = xdr_inline_decode(xdr, 4); 776 if (unlikely(p == NULL)) 777 goto out_overflow; 778 if (*p != xdr_zero) 779 return decode_wcc_attr(xdr, fattr); 780 return 0; 781 out_overflow: 782 print_overflow_msg(__func__, xdr); 783 return -EIO; 784 } 785 786 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr) 787 { 788 int error; 789 790 error = decode_pre_op_attr(xdr, fattr); 791 if (unlikely(error)) 792 goto out; 793 error = decode_post_op_attr(xdr, fattr); 794 out: 795 return error; 796 } 797 798 /* 799 * post_op_fh3 800 * 801 * union post_op_fh3 switch (bool handle_follows) { 802 * case TRUE: 803 * nfs_fh3 handle; 804 * case FALSE: 805 * void; 806 * }; 807 */ 808 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh) 809 { 810 __be32 *p = xdr_inline_decode(xdr, 4); 811 if (unlikely(p == NULL)) 812 goto out_overflow; 813 if (*p != xdr_zero) 814 return decode_nfs_fh3(xdr, fh); 815 zero_nfs_fh3(fh); 816 return 0; 817 out_overflow: 818 print_overflow_msg(__func__, xdr); 819 return -EIO; 820 } 821 822 /* 823 * diropargs3 824 * 825 * struct diropargs3 { 826 * nfs_fh3 dir; 827 * filename3 name; 828 * }; 829 */ 830 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh, 831 const char *name, u32 length) 832 { 833 encode_nfs_fh3(xdr, fh); 834 encode_filename3(xdr, name, length); 835 } 836 837 838 /* 839 * NFSv3 XDR encode functions 840 * 841 * NFSv3 argument types are defined in section 3.3 of RFC 1813: 842 * "NFS Version 3 Protocol Specification". 843 */ 844 845 /* 846 * 3.3.1 GETATTR3args 847 * 848 * struct GETATTR3args { 849 * nfs_fh3 object; 850 * }; 851 */ 852 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req, 853 struct xdr_stream *xdr, 854 const void *data) 855 { 856 const struct nfs_fh *fh = data; 857 858 encode_nfs_fh3(xdr, fh); 859 } 860 861 /* 862 * 3.3.2 SETATTR3args 863 * 864 * union sattrguard3 switch (bool check) { 865 * case TRUE: 866 * nfstime3 obj_ctime; 867 * case FALSE: 868 * void; 869 * }; 870 * 871 * struct SETATTR3args { 872 * nfs_fh3 object; 873 * sattr3 new_attributes; 874 * sattrguard3 guard; 875 * }; 876 */ 877 static void encode_sattrguard3(struct xdr_stream *xdr, 878 const struct nfs3_sattrargs *args) 879 { 880 __be32 *p; 881 882 if (args->guard) { 883 p = xdr_reserve_space(xdr, 4 + 8); 884 *p++ = xdr_one; 885 xdr_encode_nfstime3(p, &args->guardtime); 886 } else { 887 p = xdr_reserve_space(xdr, 4); 888 *p = xdr_zero; 889 } 890 } 891 892 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req, 893 struct xdr_stream *xdr, 894 const void *data) 895 { 896 const struct nfs3_sattrargs *args = data; 897 encode_nfs_fh3(xdr, args->fh); 898 encode_sattr3(xdr, args->sattr); 899 encode_sattrguard3(xdr, args); 900 } 901 902 /* 903 * 3.3.3 LOOKUP3args 904 * 905 * struct LOOKUP3args { 906 * diropargs3 what; 907 * }; 908 */ 909 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req, 910 struct xdr_stream *xdr, 911 const void *data) 912 { 913 const struct nfs3_diropargs *args = data; 914 915 encode_diropargs3(xdr, args->fh, args->name, args->len); 916 } 917 918 /* 919 * 3.3.4 ACCESS3args 920 * 921 * struct ACCESS3args { 922 * nfs_fh3 object; 923 * uint32 access; 924 * }; 925 */ 926 static void encode_access3args(struct xdr_stream *xdr, 927 const struct nfs3_accessargs *args) 928 { 929 encode_nfs_fh3(xdr, args->fh); 930 encode_uint32(xdr, args->access); 931 } 932 933 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req, 934 struct xdr_stream *xdr, 935 const void *data) 936 { 937 const struct nfs3_accessargs *args = data; 938 939 encode_access3args(xdr, args); 940 } 941 942 /* 943 * 3.3.5 READLINK3args 944 * 945 * struct READLINK3args { 946 * nfs_fh3 symlink; 947 * }; 948 */ 949 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req, 950 struct xdr_stream *xdr, 951 const void *data) 952 { 953 const struct nfs3_readlinkargs *args = data; 954 955 encode_nfs_fh3(xdr, args->fh); 956 prepare_reply_buffer(req, args->pages, args->pgbase, 957 args->pglen, NFS3_readlinkres_sz); 958 } 959 960 /* 961 * 3.3.6 READ3args 962 * 963 * struct READ3args { 964 * nfs_fh3 file; 965 * offset3 offset; 966 * count3 count; 967 * }; 968 */ 969 static void encode_read3args(struct xdr_stream *xdr, 970 const struct nfs_pgio_args *args) 971 { 972 __be32 *p; 973 974 encode_nfs_fh3(xdr, args->fh); 975 976 p = xdr_reserve_space(xdr, 8 + 4); 977 p = xdr_encode_hyper(p, args->offset); 978 *p = cpu_to_be32(args->count); 979 } 980 981 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req, 982 struct xdr_stream *xdr, 983 const void *data) 984 { 985 const struct nfs_pgio_args *args = data; 986 987 encode_read3args(xdr, args); 988 prepare_reply_buffer(req, args->pages, args->pgbase, 989 args->count, NFS3_readres_sz); 990 req->rq_rcv_buf.flags |= XDRBUF_READ; 991 } 992 993 /* 994 * 3.3.7 WRITE3args 995 * 996 * enum stable_how { 997 * UNSTABLE = 0, 998 * DATA_SYNC = 1, 999 * FILE_SYNC = 2 1000 * }; 1001 * 1002 * struct WRITE3args { 1003 * nfs_fh3 file; 1004 * offset3 offset; 1005 * count3 count; 1006 * stable_how stable; 1007 * opaque data<>; 1008 * }; 1009 */ 1010 static void encode_write3args(struct xdr_stream *xdr, 1011 const struct nfs_pgio_args *args) 1012 { 1013 __be32 *p; 1014 1015 encode_nfs_fh3(xdr, args->fh); 1016 1017 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4); 1018 p = xdr_encode_hyper(p, args->offset); 1019 *p++ = cpu_to_be32(args->count); 1020 *p++ = cpu_to_be32(args->stable); 1021 *p = cpu_to_be32(args->count); 1022 xdr_write_pages(xdr, args->pages, args->pgbase, args->count); 1023 } 1024 1025 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req, 1026 struct xdr_stream *xdr, 1027 const void *data) 1028 { 1029 const struct nfs_pgio_args *args = data; 1030 1031 encode_write3args(xdr, args); 1032 xdr->buf->flags |= XDRBUF_WRITE; 1033 } 1034 1035 /* 1036 * 3.3.8 CREATE3args 1037 * 1038 * enum createmode3 { 1039 * UNCHECKED = 0, 1040 * GUARDED = 1, 1041 * EXCLUSIVE = 2 1042 * }; 1043 * 1044 * union createhow3 switch (createmode3 mode) { 1045 * case UNCHECKED: 1046 * case GUARDED: 1047 * sattr3 obj_attributes; 1048 * case EXCLUSIVE: 1049 * createverf3 verf; 1050 * }; 1051 * 1052 * struct CREATE3args { 1053 * diropargs3 where; 1054 * createhow3 how; 1055 * }; 1056 */ 1057 static void encode_createhow3(struct xdr_stream *xdr, 1058 const struct nfs3_createargs *args) 1059 { 1060 encode_uint32(xdr, args->createmode); 1061 switch (args->createmode) { 1062 case NFS3_CREATE_UNCHECKED: 1063 case NFS3_CREATE_GUARDED: 1064 encode_sattr3(xdr, args->sattr); 1065 break; 1066 case NFS3_CREATE_EXCLUSIVE: 1067 encode_createverf3(xdr, args->verifier); 1068 break; 1069 default: 1070 BUG(); 1071 } 1072 } 1073 1074 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req, 1075 struct xdr_stream *xdr, 1076 const void *data) 1077 { 1078 const struct nfs3_createargs *args = data; 1079 1080 encode_diropargs3(xdr, args->fh, args->name, args->len); 1081 encode_createhow3(xdr, args); 1082 } 1083 1084 /* 1085 * 3.3.9 MKDIR3args 1086 * 1087 * struct MKDIR3args { 1088 * diropargs3 where; 1089 * sattr3 attributes; 1090 * }; 1091 */ 1092 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req, 1093 struct xdr_stream *xdr, 1094 const void *data) 1095 { 1096 const struct nfs3_mkdirargs *args = data; 1097 1098 encode_diropargs3(xdr, args->fh, args->name, args->len); 1099 encode_sattr3(xdr, args->sattr); 1100 } 1101 1102 /* 1103 * 3.3.10 SYMLINK3args 1104 * 1105 * struct symlinkdata3 { 1106 * sattr3 symlink_attributes; 1107 * nfspath3 symlink_data; 1108 * }; 1109 * 1110 * struct SYMLINK3args { 1111 * diropargs3 where; 1112 * symlinkdata3 symlink; 1113 * }; 1114 */ 1115 static void encode_symlinkdata3(struct xdr_stream *xdr, 1116 const void *data) 1117 { 1118 const struct nfs3_symlinkargs *args = data; 1119 1120 encode_sattr3(xdr, args->sattr); 1121 encode_nfspath3(xdr, args->pages, args->pathlen); 1122 } 1123 1124 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req, 1125 struct xdr_stream *xdr, 1126 const void *data) 1127 { 1128 const struct nfs3_symlinkargs *args = data; 1129 1130 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen); 1131 encode_symlinkdata3(xdr, args); 1132 xdr->buf->flags |= XDRBUF_WRITE; 1133 } 1134 1135 /* 1136 * 3.3.11 MKNOD3args 1137 * 1138 * struct devicedata3 { 1139 * sattr3 dev_attributes; 1140 * specdata3 spec; 1141 * }; 1142 * 1143 * union mknoddata3 switch (ftype3 type) { 1144 * case NF3CHR: 1145 * case NF3BLK: 1146 * devicedata3 device; 1147 * case NF3SOCK: 1148 * case NF3FIFO: 1149 * sattr3 pipe_attributes; 1150 * default: 1151 * void; 1152 * }; 1153 * 1154 * struct MKNOD3args { 1155 * diropargs3 where; 1156 * mknoddata3 what; 1157 * }; 1158 */ 1159 static void encode_devicedata3(struct xdr_stream *xdr, 1160 const struct nfs3_mknodargs *args) 1161 { 1162 encode_sattr3(xdr, args->sattr); 1163 encode_specdata3(xdr, args->rdev); 1164 } 1165 1166 static void encode_mknoddata3(struct xdr_stream *xdr, 1167 const struct nfs3_mknodargs *args) 1168 { 1169 encode_ftype3(xdr, args->type); 1170 switch (args->type) { 1171 case NF3CHR: 1172 case NF3BLK: 1173 encode_devicedata3(xdr, args); 1174 break; 1175 case NF3SOCK: 1176 case NF3FIFO: 1177 encode_sattr3(xdr, args->sattr); 1178 break; 1179 case NF3REG: 1180 case NF3DIR: 1181 break; 1182 default: 1183 BUG(); 1184 } 1185 } 1186 1187 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req, 1188 struct xdr_stream *xdr, 1189 const void *data) 1190 { 1191 const struct nfs3_mknodargs *args = data; 1192 1193 encode_diropargs3(xdr, args->fh, args->name, args->len); 1194 encode_mknoddata3(xdr, args); 1195 } 1196 1197 /* 1198 * 3.3.12 REMOVE3args 1199 * 1200 * struct REMOVE3args { 1201 * diropargs3 object; 1202 * }; 1203 */ 1204 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req, 1205 struct xdr_stream *xdr, 1206 const void *data) 1207 { 1208 const struct nfs_removeargs *args = data; 1209 1210 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len); 1211 } 1212 1213 /* 1214 * 3.3.14 RENAME3args 1215 * 1216 * struct RENAME3args { 1217 * diropargs3 from; 1218 * diropargs3 to; 1219 * }; 1220 */ 1221 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req, 1222 struct xdr_stream *xdr, 1223 const void *data) 1224 { 1225 const struct nfs_renameargs *args = data; 1226 const struct qstr *old = args->old_name; 1227 const struct qstr *new = args->new_name; 1228 1229 encode_diropargs3(xdr, args->old_dir, old->name, old->len); 1230 encode_diropargs3(xdr, args->new_dir, new->name, new->len); 1231 } 1232 1233 /* 1234 * 3.3.15 LINK3args 1235 * 1236 * struct LINK3args { 1237 * nfs_fh3 file; 1238 * diropargs3 link; 1239 * }; 1240 */ 1241 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req, 1242 struct xdr_stream *xdr, 1243 const void *data) 1244 { 1245 const struct nfs3_linkargs *args = data; 1246 1247 encode_nfs_fh3(xdr, args->fromfh); 1248 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen); 1249 } 1250 1251 /* 1252 * 3.3.16 READDIR3args 1253 * 1254 * struct READDIR3args { 1255 * nfs_fh3 dir; 1256 * cookie3 cookie; 1257 * cookieverf3 cookieverf; 1258 * count3 count; 1259 * }; 1260 */ 1261 static void encode_readdir3args(struct xdr_stream *xdr, 1262 const struct nfs3_readdirargs *args) 1263 { 1264 __be32 *p; 1265 1266 encode_nfs_fh3(xdr, args->fh); 1267 1268 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4); 1269 p = xdr_encode_cookie3(p, args->cookie); 1270 p = xdr_encode_cookieverf3(p, args->verf); 1271 *p = cpu_to_be32(args->count); 1272 } 1273 1274 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req, 1275 struct xdr_stream *xdr, 1276 const void *data) 1277 { 1278 const struct nfs3_readdirargs *args = data; 1279 1280 encode_readdir3args(xdr, args); 1281 prepare_reply_buffer(req, args->pages, 0, 1282 args->count, NFS3_readdirres_sz); 1283 } 1284 1285 /* 1286 * 3.3.17 READDIRPLUS3args 1287 * 1288 * struct READDIRPLUS3args { 1289 * nfs_fh3 dir; 1290 * cookie3 cookie; 1291 * cookieverf3 cookieverf; 1292 * count3 dircount; 1293 * count3 maxcount; 1294 * }; 1295 */ 1296 static void encode_readdirplus3args(struct xdr_stream *xdr, 1297 const struct nfs3_readdirargs *args) 1298 { 1299 __be32 *p; 1300 1301 encode_nfs_fh3(xdr, args->fh); 1302 1303 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4); 1304 p = xdr_encode_cookie3(p, args->cookie); 1305 p = xdr_encode_cookieverf3(p, args->verf); 1306 1307 /* 1308 * readdirplus: need dircount + buffer size. 1309 * We just make sure we make dircount big enough 1310 */ 1311 *p++ = cpu_to_be32(args->count >> 3); 1312 1313 *p = cpu_to_be32(args->count); 1314 } 1315 1316 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req, 1317 struct xdr_stream *xdr, 1318 const void *data) 1319 { 1320 const struct nfs3_readdirargs *args = data; 1321 1322 encode_readdirplus3args(xdr, args); 1323 prepare_reply_buffer(req, args->pages, 0, 1324 args->count, NFS3_readdirres_sz); 1325 } 1326 1327 /* 1328 * 3.3.21 COMMIT3args 1329 * 1330 * struct COMMIT3args { 1331 * nfs_fh3 file; 1332 * offset3 offset; 1333 * count3 count; 1334 * }; 1335 */ 1336 static void encode_commit3args(struct xdr_stream *xdr, 1337 const struct nfs_commitargs *args) 1338 { 1339 __be32 *p; 1340 1341 encode_nfs_fh3(xdr, args->fh); 1342 1343 p = xdr_reserve_space(xdr, 8 + 4); 1344 p = xdr_encode_hyper(p, args->offset); 1345 *p = cpu_to_be32(args->count); 1346 } 1347 1348 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req, 1349 struct xdr_stream *xdr, 1350 const void *data) 1351 { 1352 const struct nfs_commitargs *args = data; 1353 1354 encode_commit3args(xdr, args); 1355 } 1356 1357 #ifdef CONFIG_NFS_V3_ACL 1358 1359 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req, 1360 struct xdr_stream *xdr, 1361 const void *data) 1362 { 1363 const struct nfs3_getaclargs *args = data; 1364 1365 encode_nfs_fh3(xdr, args->fh); 1366 encode_uint32(xdr, args->mask); 1367 if (args->mask & (NFS_ACL | NFS_DFACL)) { 1368 prepare_reply_buffer(req, args->pages, 0, 1369 NFSACL_MAXPAGES << PAGE_SHIFT, 1370 ACL3_getaclres_sz); 1371 req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES; 1372 } 1373 } 1374 1375 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req, 1376 struct xdr_stream *xdr, 1377 const void *data) 1378 { 1379 const struct nfs3_setaclargs *args = data; 1380 unsigned int base; 1381 int error; 1382 1383 encode_nfs_fh3(xdr, NFS_FH(args->inode)); 1384 encode_uint32(xdr, args->mask); 1385 1386 base = req->rq_slen; 1387 if (args->npages != 0) 1388 xdr_write_pages(xdr, args->pages, 0, args->len); 1389 else 1390 xdr_reserve_space(xdr, args->len); 1391 1392 error = nfsacl_encode(xdr->buf, base, args->inode, 1393 (args->mask & NFS_ACL) ? 1394 args->acl_access : NULL, 1, 0); 1395 /* FIXME: this is just broken */ 1396 BUG_ON(error < 0); 1397 error = nfsacl_encode(xdr->buf, base + error, args->inode, 1398 (args->mask & NFS_DFACL) ? 1399 args->acl_default : NULL, 1, 1400 NFS_ACL_DEFAULT); 1401 BUG_ON(error < 0); 1402 } 1403 1404 #endif /* CONFIG_NFS_V3_ACL */ 1405 1406 /* 1407 * NFSv3 XDR decode functions 1408 * 1409 * NFSv3 result types are defined in section 3.3 of RFC 1813: 1410 * "NFS Version 3 Protocol Specification". 1411 */ 1412 1413 /* 1414 * 3.3.1 GETATTR3res 1415 * 1416 * struct GETATTR3resok { 1417 * fattr3 obj_attributes; 1418 * }; 1419 * 1420 * union GETATTR3res switch (nfsstat3 status) { 1421 * case NFS3_OK: 1422 * GETATTR3resok resok; 1423 * default: 1424 * void; 1425 * }; 1426 */ 1427 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req, 1428 struct xdr_stream *xdr, 1429 void *result) 1430 { 1431 enum nfs_stat status; 1432 int error; 1433 1434 error = decode_nfsstat3(xdr, &status); 1435 if (unlikely(error)) 1436 goto out; 1437 if (status != NFS3_OK) 1438 goto out_default; 1439 error = decode_fattr3(xdr, result); 1440 out: 1441 return error; 1442 out_default: 1443 return nfs3_stat_to_errno(status); 1444 } 1445 1446 /* 1447 * 3.3.2 SETATTR3res 1448 * 1449 * struct SETATTR3resok { 1450 * wcc_data obj_wcc; 1451 * }; 1452 * 1453 * struct SETATTR3resfail { 1454 * wcc_data obj_wcc; 1455 * }; 1456 * 1457 * union SETATTR3res switch (nfsstat3 status) { 1458 * case NFS3_OK: 1459 * SETATTR3resok resok; 1460 * default: 1461 * SETATTR3resfail resfail; 1462 * }; 1463 */ 1464 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req, 1465 struct xdr_stream *xdr, 1466 void *result) 1467 { 1468 enum nfs_stat status; 1469 int error; 1470 1471 error = decode_nfsstat3(xdr, &status); 1472 if (unlikely(error)) 1473 goto out; 1474 error = decode_wcc_data(xdr, result); 1475 if (unlikely(error)) 1476 goto out; 1477 if (status != NFS3_OK) 1478 goto out_status; 1479 out: 1480 return error; 1481 out_status: 1482 return nfs3_stat_to_errno(status); 1483 } 1484 1485 /* 1486 * 3.3.3 LOOKUP3res 1487 * 1488 * struct LOOKUP3resok { 1489 * nfs_fh3 object; 1490 * post_op_attr obj_attributes; 1491 * post_op_attr dir_attributes; 1492 * }; 1493 * 1494 * struct LOOKUP3resfail { 1495 * post_op_attr dir_attributes; 1496 * }; 1497 * 1498 * union LOOKUP3res switch (nfsstat3 status) { 1499 * case NFS3_OK: 1500 * LOOKUP3resok resok; 1501 * default: 1502 * LOOKUP3resfail resfail; 1503 * }; 1504 */ 1505 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req, 1506 struct xdr_stream *xdr, 1507 void *data) 1508 { 1509 struct nfs3_diropres *result = data; 1510 enum nfs_stat status; 1511 int error; 1512 1513 error = decode_nfsstat3(xdr, &status); 1514 if (unlikely(error)) 1515 goto out; 1516 if (status != NFS3_OK) 1517 goto out_default; 1518 error = decode_nfs_fh3(xdr, result->fh); 1519 if (unlikely(error)) 1520 goto out; 1521 error = decode_post_op_attr(xdr, result->fattr); 1522 if (unlikely(error)) 1523 goto out; 1524 error = decode_post_op_attr(xdr, result->dir_attr); 1525 out: 1526 return error; 1527 out_default: 1528 error = decode_post_op_attr(xdr, result->dir_attr); 1529 if (unlikely(error)) 1530 goto out; 1531 return nfs3_stat_to_errno(status); 1532 } 1533 1534 /* 1535 * 3.3.4 ACCESS3res 1536 * 1537 * struct ACCESS3resok { 1538 * post_op_attr obj_attributes; 1539 * uint32 access; 1540 * }; 1541 * 1542 * struct ACCESS3resfail { 1543 * post_op_attr obj_attributes; 1544 * }; 1545 * 1546 * union ACCESS3res switch (nfsstat3 status) { 1547 * case NFS3_OK: 1548 * ACCESS3resok resok; 1549 * default: 1550 * ACCESS3resfail resfail; 1551 * }; 1552 */ 1553 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req, 1554 struct xdr_stream *xdr, 1555 void *data) 1556 { 1557 struct nfs3_accessres *result = data; 1558 enum nfs_stat status; 1559 int error; 1560 1561 error = decode_nfsstat3(xdr, &status); 1562 if (unlikely(error)) 1563 goto out; 1564 error = decode_post_op_attr(xdr, result->fattr); 1565 if (unlikely(error)) 1566 goto out; 1567 if (status != NFS3_OK) 1568 goto out_default; 1569 error = decode_uint32(xdr, &result->access); 1570 out: 1571 return error; 1572 out_default: 1573 return nfs3_stat_to_errno(status); 1574 } 1575 1576 /* 1577 * 3.3.5 READLINK3res 1578 * 1579 * struct READLINK3resok { 1580 * post_op_attr symlink_attributes; 1581 * nfspath3 data; 1582 * }; 1583 * 1584 * struct READLINK3resfail { 1585 * post_op_attr symlink_attributes; 1586 * }; 1587 * 1588 * union READLINK3res switch (nfsstat3 status) { 1589 * case NFS3_OK: 1590 * READLINK3resok resok; 1591 * default: 1592 * READLINK3resfail resfail; 1593 * }; 1594 */ 1595 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req, 1596 struct xdr_stream *xdr, 1597 void *result) 1598 { 1599 enum nfs_stat status; 1600 int error; 1601 1602 error = decode_nfsstat3(xdr, &status); 1603 if (unlikely(error)) 1604 goto out; 1605 error = decode_post_op_attr(xdr, result); 1606 if (unlikely(error)) 1607 goto out; 1608 if (status != NFS3_OK) 1609 goto out_default; 1610 error = decode_nfspath3(xdr); 1611 out: 1612 return error; 1613 out_default: 1614 return nfs3_stat_to_errno(status); 1615 } 1616 1617 /* 1618 * 3.3.6 READ3res 1619 * 1620 * struct READ3resok { 1621 * post_op_attr file_attributes; 1622 * count3 count; 1623 * bool eof; 1624 * opaque data<>; 1625 * }; 1626 * 1627 * struct READ3resfail { 1628 * post_op_attr file_attributes; 1629 * }; 1630 * 1631 * union READ3res switch (nfsstat3 status) { 1632 * case NFS3_OK: 1633 * READ3resok resok; 1634 * default: 1635 * READ3resfail resfail; 1636 * }; 1637 */ 1638 static int decode_read3resok(struct xdr_stream *xdr, 1639 struct nfs_pgio_res *result) 1640 { 1641 u32 eof, count, ocount, recvd; 1642 __be32 *p; 1643 1644 p = xdr_inline_decode(xdr, 4 + 4 + 4); 1645 if (unlikely(p == NULL)) 1646 goto out_overflow; 1647 count = be32_to_cpup(p++); 1648 eof = be32_to_cpup(p++); 1649 ocount = be32_to_cpup(p++); 1650 if (unlikely(ocount != count)) 1651 goto out_mismatch; 1652 recvd = xdr_read_pages(xdr, count); 1653 if (unlikely(count > recvd)) 1654 goto out_cheating; 1655 out: 1656 result->eof = eof; 1657 result->count = count; 1658 return count; 1659 out_mismatch: 1660 dprintk("NFS: READ count doesn't match length of opaque: " 1661 "count %u != ocount %u\n", count, ocount); 1662 return -EIO; 1663 out_cheating: 1664 dprintk("NFS: server cheating in read result: " 1665 "count %u > recvd %u\n", count, recvd); 1666 count = recvd; 1667 eof = 0; 1668 goto out; 1669 out_overflow: 1670 print_overflow_msg(__func__, xdr); 1671 return -EIO; 1672 } 1673 1674 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr, 1675 void *data) 1676 { 1677 struct nfs_pgio_res *result = data; 1678 enum nfs_stat status; 1679 int error; 1680 1681 error = decode_nfsstat3(xdr, &status); 1682 if (unlikely(error)) 1683 goto out; 1684 error = decode_post_op_attr(xdr, result->fattr); 1685 if (unlikely(error)) 1686 goto out; 1687 result->op_status = status; 1688 if (status != NFS3_OK) 1689 goto out_status; 1690 error = decode_read3resok(xdr, result); 1691 out: 1692 return error; 1693 out_status: 1694 return nfs3_stat_to_errno(status); 1695 } 1696 1697 /* 1698 * 3.3.7 WRITE3res 1699 * 1700 * enum stable_how { 1701 * UNSTABLE = 0, 1702 * DATA_SYNC = 1, 1703 * FILE_SYNC = 2 1704 * }; 1705 * 1706 * struct WRITE3resok { 1707 * wcc_data file_wcc; 1708 * count3 count; 1709 * stable_how committed; 1710 * writeverf3 verf; 1711 * }; 1712 * 1713 * struct WRITE3resfail { 1714 * wcc_data file_wcc; 1715 * }; 1716 * 1717 * union WRITE3res switch (nfsstat3 status) { 1718 * case NFS3_OK: 1719 * WRITE3resok resok; 1720 * default: 1721 * WRITE3resfail resfail; 1722 * }; 1723 */ 1724 static int decode_write3resok(struct xdr_stream *xdr, 1725 struct nfs_pgio_res *result) 1726 { 1727 __be32 *p; 1728 1729 p = xdr_inline_decode(xdr, 4 + 4); 1730 if (unlikely(p == NULL)) 1731 goto out_overflow; 1732 result->count = be32_to_cpup(p++); 1733 result->verf->committed = be32_to_cpup(p++); 1734 if (unlikely(result->verf->committed > NFS_FILE_SYNC)) 1735 goto out_badvalue; 1736 if (decode_writeverf3(xdr, &result->verf->verifier)) 1737 goto out_eio; 1738 return result->count; 1739 out_badvalue: 1740 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed); 1741 return -EIO; 1742 out_overflow: 1743 print_overflow_msg(__func__, xdr); 1744 out_eio: 1745 return -EIO; 1746 } 1747 1748 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr, 1749 void *data) 1750 { 1751 struct nfs_pgio_res *result = data; 1752 enum nfs_stat status; 1753 int error; 1754 1755 error = decode_nfsstat3(xdr, &status); 1756 if (unlikely(error)) 1757 goto out; 1758 error = decode_wcc_data(xdr, result->fattr); 1759 if (unlikely(error)) 1760 goto out; 1761 result->op_status = status; 1762 if (status != NFS3_OK) 1763 goto out_status; 1764 error = decode_write3resok(xdr, result); 1765 out: 1766 return error; 1767 out_status: 1768 return nfs3_stat_to_errno(status); 1769 } 1770 1771 /* 1772 * 3.3.8 CREATE3res 1773 * 1774 * struct CREATE3resok { 1775 * post_op_fh3 obj; 1776 * post_op_attr obj_attributes; 1777 * wcc_data dir_wcc; 1778 * }; 1779 * 1780 * struct CREATE3resfail { 1781 * wcc_data dir_wcc; 1782 * }; 1783 * 1784 * union CREATE3res switch (nfsstat3 status) { 1785 * case NFS3_OK: 1786 * CREATE3resok resok; 1787 * default: 1788 * CREATE3resfail resfail; 1789 * }; 1790 */ 1791 static int decode_create3resok(struct xdr_stream *xdr, 1792 struct nfs3_diropres *result) 1793 { 1794 int error; 1795 1796 error = decode_post_op_fh3(xdr, result->fh); 1797 if (unlikely(error)) 1798 goto out; 1799 error = decode_post_op_attr(xdr, result->fattr); 1800 if (unlikely(error)) 1801 goto out; 1802 /* The server isn't required to return a file handle. 1803 * If it didn't, force the client to perform a LOOKUP 1804 * to determine the correct file handle and attribute 1805 * values for the new object. */ 1806 if (result->fh->size == 0) 1807 result->fattr->valid = 0; 1808 error = decode_wcc_data(xdr, result->dir_attr); 1809 out: 1810 return error; 1811 } 1812 1813 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req, 1814 struct xdr_stream *xdr, 1815 void *data) 1816 { 1817 struct nfs3_diropres *result = data; 1818 enum nfs_stat status; 1819 int error; 1820 1821 error = decode_nfsstat3(xdr, &status); 1822 if (unlikely(error)) 1823 goto out; 1824 if (status != NFS3_OK) 1825 goto out_default; 1826 error = decode_create3resok(xdr, result); 1827 out: 1828 return error; 1829 out_default: 1830 error = decode_wcc_data(xdr, result->dir_attr); 1831 if (unlikely(error)) 1832 goto out; 1833 return nfs3_stat_to_errno(status); 1834 } 1835 1836 /* 1837 * 3.3.12 REMOVE3res 1838 * 1839 * struct REMOVE3resok { 1840 * wcc_data dir_wcc; 1841 * }; 1842 * 1843 * struct REMOVE3resfail { 1844 * wcc_data dir_wcc; 1845 * }; 1846 * 1847 * union REMOVE3res switch (nfsstat3 status) { 1848 * case NFS3_OK: 1849 * REMOVE3resok resok; 1850 * default: 1851 * REMOVE3resfail resfail; 1852 * }; 1853 */ 1854 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req, 1855 struct xdr_stream *xdr, 1856 void *data) 1857 { 1858 struct nfs_removeres *result = data; 1859 enum nfs_stat status; 1860 int error; 1861 1862 error = decode_nfsstat3(xdr, &status); 1863 if (unlikely(error)) 1864 goto out; 1865 error = decode_wcc_data(xdr, result->dir_attr); 1866 if (unlikely(error)) 1867 goto out; 1868 if (status != NFS3_OK) 1869 goto out_status; 1870 out: 1871 return error; 1872 out_status: 1873 return nfs3_stat_to_errno(status); 1874 } 1875 1876 /* 1877 * 3.3.14 RENAME3res 1878 * 1879 * struct RENAME3resok { 1880 * wcc_data fromdir_wcc; 1881 * wcc_data todir_wcc; 1882 * }; 1883 * 1884 * struct RENAME3resfail { 1885 * wcc_data fromdir_wcc; 1886 * wcc_data todir_wcc; 1887 * }; 1888 * 1889 * union RENAME3res switch (nfsstat3 status) { 1890 * case NFS3_OK: 1891 * RENAME3resok resok; 1892 * default: 1893 * RENAME3resfail resfail; 1894 * }; 1895 */ 1896 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req, 1897 struct xdr_stream *xdr, 1898 void *data) 1899 { 1900 struct nfs_renameres *result = data; 1901 enum nfs_stat status; 1902 int error; 1903 1904 error = decode_nfsstat3(xdr, &status); 1905 if (unlikely(error)) 1906 goto out; 1907 error = decode_wcc_data(xdr, result->old_fattr); 1908 if (unlikely(error)) 1909 goto out; 1910 error = decode_wcc_data(xdr, result->new_fattr); 1911 if (unlikely(error)) 1912 goto out; 1913 if (status != NFS3_OK) 1914 goto out_status; 1915 out: 1916 return error; 1917 out_status: 1918 return nfs3_stat_to_errno(status); 1919 } 1920 1921 /* 1922 * 3.3.15 LINK3res 1923 * 1924 * struct LINK3resok { 1925 * post_op_attr file_attributes; 1926 * wcc_data linkdir_wcc; 1927 * }; 1928 * 1929 * struct LINK3resfail { 1930 * post_op_attr file_attributes; 1931 * wcc_data linkdir_wcc; 1932 * }; 1933 * 1934 * union LINK3res switch (nfsstat3 status) { 1935 * case NFS3_OK: 1936 * LINK3resok resok; 1937 * default: 1938 * LINK3resfail resfail; 1939 * }; 1940 */ 1941 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr, 1942 void *data) 1943 { 1944 struct nfs3_linkres *result = data; 1945 enum nfs_stat status; 1946 int error; 1947 1948 error = decode_nfsstat3(xdr, &status); 1949 if (unlikely(error)) 1950 goto out; 1951 error = decode_post_op_attr(xdr, result->fattr); 1952 if (unlikely(error)) 1953 goto out; 1954 error = decode_wcc_data(xdr, result->dir_attr); 1955 if (unlikely(error)) 1956 goto out; 1957 if (status != NFS3_OK) 1958 goto out_status; 1959 out: 1960 return error; 1961 out_status: 1962 return nfs3_stat_to_errno(status); 1963 } 1964 1965 /** 1966 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in 1967 * the local page cache 1968 * @xdr: XDR stream where entry resides 1969 * @entry: buffer to fill in with entry data 1970 * @plus: boolean indicating whether this should be a readdirplus entry 1971 * 1972 * Returns zero if successful, otherwise a negative errno value is 1973 * returned. 1974 * 1975 * This function is not invoked during READDIR reply decoding, but 1976 * rather whenever an application invokes the getdents(2) system call 1977 * on a directory already in our cache. 1978 * 1979 * 3.3.16 entry3 1980 * 1981 * struct entry3 { 1982 * fileid3 fileid; 1983 * filename3 name; 1984 * cookie3 cookie; 1985 * fhandle3 filehandle; 1986 * post_op_attr3 attributes; 1987 * entry3 *nextentry; 1988 * }; 1989 * 1990 * 3.3.17 entryplus3 1991 * struct entryplus3 { 1992 * fileid3 fileid; 1993 * filename3 name; 1994 * cookie3 cookie; 1995 * post_op_attr name_attributes; 1996 * post_op_fh3 name_handle; 1997 * entryplus3 *nextentry; 1998 * }; 1999 */ 2000 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry, 2001 bool plus) 2002 { 2003 struct nfs_entry old = *entry; 2004 __be32 *p; 2005 int error; 2006 u64 new_cookie; 2007 2008 p = xdr_inline_decode(xdr, 4); 2009 if (unlikely(p == NULL)) 2010 goto out_overflow; 2011 if (*p == xdr_zero) { 2012 p = xdr_inline_decode(xdr, 4); 2013 if (unlikely(p == NULL)) 2014 goto out_overflow; 2015 if (*p == xdr_zero) 2016 return -EAGAIN; 2017 entry->eof = 1; 2018 return -EBADCOOKIE; 2019 } 2020 2021 error = decode_fileid3(xdr, &entry->ino); 2022 if (unlikely(error)) 2023 return error; 2024 2025 error = decode_inline_filename3(xdr, &entry->name, &entry->len); 2026 if (unlikely(error)) 2027 return error; 2028 2029 error = decode_cookie3(xdr, &new_cookie); 2030 if (unlikely(error)) 2031 return error; 2032 2033 entry->d_type = DT_UNKNOWN; 2034 2035 if (plus) { 2036 entry->fattr->valid = 0; 2037 error = decode_post_op_attr(xdr, entry->fattr); 2038 if (unlikely(error)) 2039 return error; 2040 if (entry->fattr->valid & NFS_ATTR_FATTR_V3) 2041 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode); 2042 2043 if (entry->fattr->fileid != entry->ino) { 2044 entry->fattr->mounted_on_fileid = entry->ino; 2045 entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID; 2046 } 2047 2048 /* In fact, a post_op_fh3: */ 2049 p = xdr_inline_decode(xdr, 4); 2050 if (unlikely(p == NULL)) 2051 goto out_overflow; 2052 if (*p != xdr_zero) { 2053 error = decode_nfs_fh3(xdr, entry->fh); 2054 if (unlikely(error)) { 2055 if (error == -E2BIG) 2056 goto out_truncated; 2057 return error; 2058 } 2059 } else 2060 zero_nfs_fh3(entry->fh); 2061 } 2062 2063 entry->prev_cookie = entry->cookie; 2064 entry->cookie = new_cookie; 2065 2066 return 0; 2067 2068 out_overflow: 2069 print_overflow_msg(__func__, xdr); 2070 return -EAGAIN; 2071 out_truncated: 2072 dprintk("NFS: directory entry contains invalid file handle\n"); 2073 *entry = old; 2074 return -EAGAIN; 2075 } 2076 2077 /* 2078 * 3.3.16 READDIR3res 2079 * 2080 * struct dirlist3 { 2081 * entry3 *entries; 2082 * bool eof; 2083 * }; 2084 * 2085 * struct READDIR3resok { 2086 * post_op_attr dir_attributes; 2087 * cookieverf3 cookieverf; 2088 * dirlist3 reply; 2089 * }; 2090 * 2091 * struct READDIR3resfail { 2092 * post_op_attr dir_attributes; 2093 * }; 2094 * 2095 * union READDIR3res switch (nfsstat3 status) { 2096 * case NFS3_OK: 2097 * READDIR3resok resok; 2098 * default: 2099 * READDIR3resfail resfail; 2100 * }; 2101 * 2102 * Read the directory contents into the page cache, but otherwise 2103 * don't touch them. The actual decoding is done by nfs3_decode_entry() 2104 * during subsequent nfs_readdir() calls. 2105 */ 2106 static int decode_dirlist3(struct xdr_stream *xdr) 2107 { 2108 return xdr_read_pages(xdr, xdr->buf->page_len); 2109 } 2110 2111 static int decode_readdir3resok(struct xdr_stream *xdr, 2112 struct nfs3_readdirres *result) 2113 { 2114 int error; 2115 2116 error = decode_post_op_attr(xdr, result->dir_attr); 2117 if (unlikely(error)) 2118 goto out; 2119 /* XXX: do we need to check if result->verf != NULL ? */ 2120 error = decode_cookieverf3(xdr, result->verf); 2121 if (unlikely(error)) 2122 goto out; 2123 error = decode_dirlist3(xdr); 2124 out: 2125 return error; 2126 } 2127 2128 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req, 2129 struct xdr_stream *xdr, 2130 void *data) 2131 { 2132 struct nfs3_readdirres *result = data; 2133 enum nfs_stat status; 2134 int error; 2135 2136 error = decode_nfsstat3(xdr, &status); 2137 if (unlikely(error)) 2138 goto out; 2139 if (status != NFS3_OK) 2140 goto out_default; 2141 error = decode_readdir3resok(xdr, result); 2142 out: 2143 return error; 2144 out_default: 2145 error = decode_post_op_attr(xdr, result->dir_attr); 2146 if (unlikely(error)) 2147 goto out; 2148 return nfs3_stat_to_errno(status); 2149 } 2150 2151 /* 2152 * 3.3.18 FSSTAT3res 2153 * 2154 * struct FSSTAT3resok { 2155 * post_op_attr obj_attributes; 2156 * size3 tbytes; 2157 * size3 fbytes; 2158 * size3 abytes; 2159 * size3 tfiles; 2160 * size3 ffiles; 2161 * size3 afiles; 2162 * uint32 invarsec; 2163 * }; 2164 * 2165 * struct FSSTAT3resfail { 2166 * post_op_attr obj_attributes; 2167 * }; 2168 * 2169 * union FSSTAT3res switch (nfsstat3 status) { 2170 * case NFS3_OK: 2171 * FSSTAT3resok resok; 2172 * default: 2173 * FSSTAT3resfail resfail; 2174 * }; 2175 */ 2176 static int decode_fsstat3resok(struct xdr_stream *xdr, 2177 struct nfs_fsstat *result) 2178 { 2179 __be32 *p; 2180 2181 p = xdr_inline_decode(xdr, 8 * 6 + 4); 2182 if (unlikely(p == NULL)) 2183 goto out_overflow; 2184 p = xdr_decode_size3(p, &result->tbytes); 2185 p = xdr_decode_size3(p, &result->fbytes); 2186 p = xdr_decode_size3(p, &result->abytes); 2187 p = xdr_decode_size3(p, &result->tfiles); 2188 p = xdr_decode_size3(p, &result->ffiles); 2189 xdr_decode_size3(p, &result->afiles); 2190 /* ignore invarsec */ 2191 return 0; 2192 out_overflow: 2193 print_overflow_msg(__func__, xdr); 2194 return -EIO; 2195 } 2196 2197 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req, 2198 struct xdr_stream *xdr, 2199 void *data) 2200 { 2201 struct nfs_fsstat *result = data; 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_fsstat3resok(xdr, result); 2214 out: 2215 return error; 2216 out_status: 2217 return nfs3_stat_to_errno(status); 2218 } 2219 2220 /* 2221 * 3.3.19 FSINFO3res 2222 * 2223 * struct FSINFO3resok { 2224 * post_op_attr obj_attributes; 2225 * uint32 rtmax; 2226 * uint32 rtpref; 2227 * uint32 rtmult; 2228 * uint32 wtmax; 2229 * uint32 wtpref; 2230 * uint32 wtmult; 2231 * uint32 dtpref; 2232 * size3 maxfilesize; 2233 * nfstime3 time_delta; 2234 * uint32 properties; 2235 * }; 2236 * 2237 * struct FSINFO3resfail { 2238 * post_op_attr obj_attributes; 2239 * }; 2240 * 2241 * union FSINFO3res switch (nfsstat3 status) { 2242 * case NFS3_OK: 2243 * FSINFO3resok resok; 2244 * default: 2245 * FSINFO3resfail resfail; 2246 * }; 2247 */ 2248 static int decode_fsinfo3resok(struct xdr_stream *xdr, 2249 struct nfs_fsinfo *result) 2250 { 2251 __be32 *p; 2252 2253 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4); 2254 if (unlikely(p == NULL)) 2255 goto out_overflow; 2256 result->rtmax = be32_to_cpup(p++); 2257 result->rtpref = be32_to_cpup(p++); 2258 result->rtmult = be32_to_cpup(p++); 2259 result->wtmax = be32_to_cpup(p++); 2260 result->wtpref = be32_to_cpup(p++); 2261 result->wtmult = be32_to_cpup(p++); 2262 result->dtpref = be32_to_cpup(p++); 2263 p = xdr_decode_size3(p, &result->maxfilesize); 2264 xdr_decode_nfstime3(p, &result->time_delta); 2265 2266 /* ignore properties */ 2267 result->lease_time = 0; 2268 return 0; 2269 out_overflow: 2270 print_overflow_msg(__func__, xdr); 2271 return -EIO; 2272 } 2273 2274 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req, 2275 struct xdr_stream *xdr, 2276 void *data) 2277 { 2278 struct nfs_fsinfo *result = data; 2279 enum nfs_stat status; 2280 int error; 2281 2282 error = decode_nfsstat3(xdr, &status); 2283 if (unlikely(error)) 2284 goto out; 2285 error = decode_post_op_attr(xdr, result->fattr); 2286 if (unlikely(error)) 2287 goto out; 2288 if (status != NFS3_OK) 2289 goto out_status; 2290 error = decode_fsinfo3resok(xdr, result); 2291 out: 2292 return error; 2293 out_status: 2294 return nfs3_stat_to_errno(status); 2295 } 2296 2297 /* 2298 * 3.3.20 PATHCONF3res 2299 * 2300 * struct PATHCONF3resok { 2301 * post_op_attr obj_attributes; 2302 * uint32 linkmax; 2303 * uint32 name_max; 2304 * bool no_trunc; 2305 * bool chown_restricted; 2306 * bool case_insensitive; 2307 * bool case_preserving; 2308 * }; 2309 * 2310 * struct PATHCONF3resfail { 2311 * post_op_attr obj_attributes; 2312 * }; 2313 * 2314 * union PATHCONF3res switch (nfsstat3 status) { 2315 * case NFS3_OK: 2316 * PATHCONF3resok resok; 2317 * default: 2318 * PATHCONF3resfail resfail; 2319 * }; 2320 */ 2321 static int decode_pathconf3resok(struct xdr_stream *xdr, 2322 struct nfs_pathconf *result) 2323 { 2324 __be32 *p; 2325 2326 p = xdr_inline_decode(xdr, 4 * 6); 2327 if (unlikely(p == NULL)) 2328 goto out_overflow; 2329 result->max_link = be32_to_cpup(p++); 2330 result->max_namelen = be32_to_cpup(p); 2331 /* ignore remaining fields */ 2332 return 0; 2333 out_overflow: 2334 print_overflow_msg(__func__, xdr); 2335 return -EIO; 2336 } 2337 2338 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req, 2339 struct xdr_stream *xdr, 2340 void *data) 2341 { 2342 struct nfs_pathconf *result = data; 2343 enum nfs_stat status; 2344 int error; 2345 2346 error = decode_nfsstat3(xdr, &status); 2347 if (unlikely(error)) 2348 goto out; 2349 error = decode_post_op_attr(xdr, result->fattr); 2350 if (unlikely(error)) 2351 goto out; 2352 if (status != NFS3_OK) 2353 goto out_status; 2354 error = decode_pathconf3resok(xdr, result); 2355 out: 2356 return error; 2357 out_status: 2358 return nfs3_stat_to_errno(status); 2359 } 2360 2361 /* 2362 * 3.3.21 COMMIT3res 2363 * 2364 * struct COMMIT3resok { 2365 * wcc_data file_wcc; 2366 * writeverf3 verf; 2367 * }; 2368 * 2369 * struct COMMIT3resfail { 2370 * wcc_data file_wcc; 2371 * }; 2372 * 2373 * union COMMIT3res switch (nfsstat3 status) { 2374 * case NFS3_OK: 2375 * COMMIT3resok resok; 2376 * default: 2377 * COMMIT3resfail resfail; 2378 * }; 2379 */ 2380 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req, 2381 struct xdr_stream *xdr, 2382 void *data) 2383 { 2384 struct nfs_commitres *result = data; 2385 enum nfs_stat status; 2386 int error; 2387 2388 error = decode_nfsstat3(xdr, &status); 2389 if (unlikely(error)) 2390 goto out; 2391 error = decode_wcc_data(xdr, result->fattr); 2392 if (unlikely(error)) 2393 goto out; 2394 result->op_status = status; 2395 if (status != NFS3_OK) 2396 goto out_status; 2397 error = decode_writeverf3(xdr, &result->verf->verifier); 2398 out: 2399 return error; 2400 out_status: 2401 return nfs3_stat_to_errno(status); 2402 } 2403 2404 #ifdef CONFIG_NFS_V3_ACL 2405 2406 static inline int decode_getacl3resok(struct xdr_stream *xdr, 2407 struct nfs3_getaclres *result) 2408 { 2409 struct posix_acl **acl; 2410 unsigned int *aclcnt; 2411 size_t hdrlen; 2412 int error; 2413 2414 error = decode_post_op_attr(xdr, result->fattr); 2415 if (unlikely(error)) 2416 goto out; 2417 error = decode_uint32(xdr, &result->mask); 2418 if (unlikely(error)) 2419 goto out; 2420 error = -EINVAL; 2421 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT)) 2422 goto out; 2423 2424 hdrlen = xdr_stream_pos(xdr); 2425 2426 acl = NULL; 2427 if (result->mask & NFS_ACL) 2428 acl = &result->acl_access; 2429 aclcnt = NULL; 2430 if (result->mask & NFS_ACLCNT) 2431 aclcnt = &result->acl_access_count; 2432 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl); 2433 if (unlikely(error <= 0)) 2434 goto out; 2435 2436 acl = NULL; 2437 if (result->mask & NFS_DFACL) 2438 acl = &result->acl_default; 2439 aclcnt = NULL; 2440 if (result->mask & NFS_DFACLCNT) 2441 aclcnt = &result->acl_default_count; 2442 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl); 2443 if (unlikely(error <= 0)) 2444 return error; 2445 error = 0; 2446 out: 2447 return error; 2448 } 2449 2450 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req, 2451 struct xdr_stream *xdr, 2452 void *result) 2453 { 2454 enum nfs_stat status; 2455 int error; 2456 2457 error = decode_nfsstat3(xdr, &status); 2458 if (unlikely(error)) 2459 goto out; 2460 if (status != NFS3_OK) 2461 goto out_default; 2462 error = decode_getacl3resok(xdr, result); 2463 out: 2464 return error; 2465 out_default: 2466 return nfs3_stat_to_errno(status); 2467 } 2468 2469 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req, 2470 struct xdr_stream *xdr, 2471 void *result) 2472 { 2473 enum nfs_stat status; 2474 int error; 2475 2476 error = decode_nfsstat3(xdr, &status); 2477 if (unlikely(error)) 2478 goto out; 2479 if (status != NFS3_OK) 2480 goto out_default; 2481 error = decode_post_op_attr(xdr, result); 2482 out: 2483 return error; 2484 out_default: 2485 return nfs3_stat_to_errno(status); 2486 } 2487 2488 #endif /* CONFIG_NFS_V3_ACL */ 2489 2490 2491 /* 2492 * We need to translate between nfs status return values and 2493 * the local errno values which may not be the same. 2494 */ 2495 static const struct { 2496 int stat; 2497 int errno; 2498 } nfs_errtbl[] = { 2499 { NFS_OK, 0 }, 2500 { NFSERR_PERM, -EPERM }, 2501 { NFSERR_NOENT, -ENOENT }, 2502 { NFSERR_IO, -errno_NFSERR_IO}, 2503 { NFSERR_NXIO, -ENXIO }, 2504 /* { NFSERR_EAGAIN, -EAGAIN }, */ 2505 { NFSERR_ACCES, -EACCES }, 2506 { NFSERR_EXIST, -EEXIST }, 2507 { NFSERR_XDEV, -EXDEV }, 2508 { NFSERR_NODEV, -ENODEV }, 2509 { NFSERR_NOTDIR, -ENOTDIR }, 2510 { NFSERR_ISDIR, -EISDIR }, 2511 { NFSERR_INVAL, -EINVAL }, 2512 { NFSERR_FBIG, -EFBIG }, 2513 { NFSERR_NOSPC, -ENOSPC }, 2514 { NFSERR_ROFS, -EROFS }, 2515 { NFSERR_MLINK, -EMLINK }, 2516 { NFSERR_NAMETOOLONG, -ENAMETOOLONG }, 2517 { NFSERR_NOTEMPTY, -ENOTEMPTY }, 2518 { NFSERR_DQUOT, -EDQUOT }, 2519 { NFSERR_STALE, -ESTALE }, 2520 { NFSERR_REMOTE, -EREMOTE }, 2521 #ifdef EWFLUSH 2522 { NFSERR_WFLUSH, -EWFLUSH }, 2523 #endif 2524 { NFSERR_BADHANDLE, -EBADHANDLE }, 2525 { NFSERR_NOT_SYNC, -ENOTSYNC }, 2526 { NFSERR_BAD_COOKIE, -EBADCOOKIE }, 2527 { NFSERR_NOTSUPP, -ENOTSUPP }, 2528 { NFSERR_TOOSMALL, -ETOOSMALL }, 2529 { NFSERR_SERVERFAULT, -EREMOTEIO }, 2530 { NFSERR_BADTYPE, -EBADTYPE }, 2531 { NFSERR_JUKEBOX, -EJUKEBOX }, 2532 { -1, -EIO } 2533 }; 2534 2535 /** 2536 * nfs3_stat_to_errno - convert an NFS status code to a local errno 2537 * @status: NFS status code to convert 2538 * 2539 * Returns a local errno value, or -EIO if the NFS status code is 2540 * not recognized. This function is used jointly by NFSv2 and NFSv3. 2541 */ 2542 static int nfs3_stat_to_errno(enum nfs_stat status) 2543 { 2544 int i; 2545 2546 for (i = 0; nfs_errtbl[i].stat != -1; i++) { 2547 if (nfs_errtbl[i].stat == (int)status) 2548 return nfs_errtbl[i].errno; 2549 } 2550 dprintk("NFS: Unrecognized nfs status value: %u\n", status); 2551 return nfs_errtbl[i].errno; 2552 } 2553 2554 2555 #define PROC(proc, argtype, restype, timer) \ 2556 [NFS3PROC_##proc] = { \ 2557 .p_proc = NFS3PROC_##proc, \ 2558 .p_encode = nfs3_xdr_enc_##argtype##3args, \ 2559 .p_decode = nfs3_xdr_dec_##restype##3res, \ 2560 .p_arglen = NFS3_##argtype##args_sz, \ 2561 .p_replen = NFS3_##restype##res_sz, \ 2562 .p_timer = timer, \ 2563 .p_statidx = NFS3PROC_##proc, \ 2564 .p_name = #proc, \ 2565 } 2566 2567 const struct rpc_procinfo nfs3_procedures[] = { 2568 PROC(GETATTR, getattr, getattr, 1), 2569 PROC(SETATTR, setattr, setattr, 0), 2570 PROC(LOOKUP, lookup, lookup, 2), 2571 PROC(ACCESS, access, access, 1), 2572 PROC(READLINK, readlink, readlink, 3), 2573 PROC(READ, read, read, 3), 2574 PROC(WRITE, write, write, 4), 2575 PROC(CREATE, create, create, 0), 2576 PROC(MKDIR, mkdir, create, 0), 2577 PROC(SYMLINK, symlink, create, 0), 2578 PROC(MKNOD, mknod, create, 0), 2579 PROC(REMOVE, remove, remove, 0), 2580 PROC(RMDIR, lookup, setattr, 0), 2581 PROC(RENAME, rename, rename, 0), 2582 PROC(LINK, link, link, 0), 2583 PROC(READDIR, readdir, readdir, 3), 2584 PROC(READDIRPLUS, readdirplus, readdir, 3), 2585 PROC(FSSTAT, getattr, fsstat, 0), 2586 PROC(FSINFO, getattr, fsinfo, 0), 2587 PROC(PATHCONF, getattr, pathconf, 0), 2588 PROC(COMMIT, commit, commit, 5), 2589 }; 2590 2591 static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)]; 2592 const struct rpc_version nfs_version3 = { 2593 .number = 3, 2594 .nrprocs = ARRAY_SIZE(nfs3_procedures), 2595 .procs = nfs3_procedures, 2596 .counts = nfs_version3_counts, 2597 }; 2598 2599 #ifdef CONFIG_NFS_V3_ACL 2600 static const struct rpc_procinfo nfs3_acl_procedures[] = { 2601 [ACLPROC3_GETACL] = { 2602 .p_proc = ACLPROC3_GETACL, 2603 .p_encode = nfs3_xdr_enc_getacl3args, 2604 .p_decode = nfs3_xdr_dec_getacl3res, 2605 .p_arglen = ACL3_getaclargs_sz, 2606 .p_replen = ACL3_getaclres_sz, 2607 .p_timer = 1, 2608 .p_name = "GETACL", 2609 }, 2610 [ACLPROC3_SETACL] = { 2611 .p_proc = ACLPROC3_SETACL, 2612 .p_encode = nfs3_xdr_enc_setacl3args, 2613 .p_decode = nfs3_xdr_dec_setacl3res, 2614 .p_arglen = ACL3_setaclargs_sz, 2615 .p_replen = ACL3_setaclres_sz, 2616 .p_timer = 0, 2617 .p_name = "SETACL", 2618 }, 2619 }; 2620 2621 static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)]; 2622 const struct rpc_version nfsacl_version3 = { 2623 .number = 3, 2624 .nrprocs = ARRAY_SIZE(nfs3_acl_procedures), 2625 .procs = nfs3_acl_procedures, 2626 .counts = nfs3_acl_counts, 2627 }; 2628 #endif /* CONFIG_NFS_V3_ACL */ 2629