1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/nfs/nfs3xdr.c 4 * 5 * XDR functions to encode/decode NFSv3 RPC arguments and results. 6 * 7 * Copyright (C) 1996, 1997 Olaf Kirch 8 */ 9 10 #include <linux/param.h> 11 #include <linux/time.h> 12 #include <linux/mm.h> 13 #include <linux/errno.h> 14 #include <linux/string.h> 15 #include <linux/in.h> 16 #include <linux/pagemap.h> 17 #include <linux/proc_fs.h> 18 #include <linux/kdev_t.h> 19 #include <linux/sunrpc/clnt.h> 20 #include <linux/nfs.h> 21 #include <linux/nfs3.h> 22 #include <linux/nfs_fs.h> 23 #include <linux/nfsacl.h> 24 #include "nfstrace.h" 25 #include "internal.h" 26 27 #define NFSDBG_FACILITY NFSDBG_XDR 28 29 /* Mapping from NFS error code to "errno" error code. */ 30 #define errno_NFSERR_IO EIO 31 32 /* 33 * Declare the space requirements for NFS arguments and replies as 34 * number of 32bit-words 35 */ 36 #define NFS3_fhandle_sz (1+16) 37 #define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */ 38 #define NFS3_sattr_sz (15) 39 #define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2)) 40 #define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2)) 41 #define NFS3_fattr_sz (21) 42 #define NFS3_cookieverf_sz (NFS3_COOKIEVERFSIZE>>2) 43 #define NFS3_wcc_attr_sz (6) 44 #define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz) 45 #define NFS3_post_op_attr_sz (1+NFS3_fattr_sz) 46 #define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz) 47 #define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz) 48 49 #define NFS3_getattrargs_sz (NFS3_fh_sz) 50 #define NFS3_setattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3) 51 #define NFS3_lookupargs_sz (NFS3_fh_sz+NFS3_filename_sz) 52 #define NFS3_accessargs_sz (NFS3_fh_sz+1) 53 #define NFS3_readlinkargs_sz (NFS3_fh_sz) 54 #define NFS3_readargs_sz (NFS3_fh_sz+3) 55 #define NFS3_writeargs_sz (NFS3_fh_sz+5) 56 #define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz) 57 #define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz) 58 #define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz) 59 #define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz) 60 #define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz) 61 #define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz) 62 #define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz) 63 #define NFS3_readdirargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+3) 64 #define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4) 65 #define NFS3_commitargs_sz (NFS3_fh_sz+3) 66 67 #define NFS3_getattrres_sz (1+NFS3_fattr_sz) 68 #define NFS3_setattrres_sz (1+NFS3_wcc_data_sz) 69 #define NFS3_removeres_sz (NFS3_setattrres_sz) 70 #define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz)) 71 #define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1) 72 #define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1+1) 73 #define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3+1) 74 #define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4) 75 #define NFS3_createres_sz (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz) 76 #define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz)) 77 #define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz) 78 #define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2+1) 79 #define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13) 80 #define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12) 81 #define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6) 82 #define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2) 83 84 #define ACL3_getaclargs_sz (NFS3_fh_sz+1) 85 #define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \ 86 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)) 87 #define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \ 88 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)+1) 89 #define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz) 90 91 static int nfs3_stat_to_errno(enum nfs_stat); 92 93 /* 94 * Map file type to S_IFMT bits 95 */ 96 static const umode_t nfs_type2fmt[] = { 97 [NF3BAD] = 0, 98 [NF3REG] = S_IFREG, 99 [NF3DIR] = S_IFDIR, 100 [NF3BLK] = S_IFBLK, 101 [NF3CHR] = S_IFCHR, 102 [NF3LNK] = S_IFLNK, 103 [NF3SOCK] = S_IFSOCK, 104 [NF3FIFO] = S_IFIFO, 105 }; 106 107 /* 108 * Encode/decode NFSv3 basic data types 109 * 110 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813: 111 * "NFS Version 3 Protocol Specification". 112 * 113 * Not all basic data types have their own encoding and decoding 114 * functions. For run-time efficiency, some data types are encoded 115 * or decoded inline. 116 */ 117 118 static void encode_uint32(struct xdr_stream *xdr, u32 value) 119 { 120 __be32 *p = xdr_reserve_space(xdr, 4); 121 *p = cpu_to_be32(value); 122 } 123 124 static int decode_uint32(struct xdr_stream *xdr, u32 *value) 125 { 126 __be32 *p; 127 128 p = xdr_inline_decode(xdr, 4); 129 if (unlikely(!p)) 130 return -EIO; 131 *value = be32_to_cpup(p); 132 return 0; 133 } 134 135 static int decode_uint64(struct xdr_stream *xdr, u64 *value) 136 { 137 __be32 *p; 138 139 p = xdr_inline_decode(xdr, 8); 140 if (unlikely(!p)) 141 return -EIO; 142 xdr_decode_hyper(p, value); 143 return 0; 144 } 145 146 /* 147 * fileid3 148 * 149 * typedef uint64 fileid3; 150 */ 151 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid) 152 { 153 return xdr_decode_hyper(p, fileid); 154 } 155 156 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid) 157 { 158 return decode_uint64(xdr, fileid); 159 } 160 161 /* 162 * filename3 163 * 164 * typedef string filename3<>; 165 */ 166 static void encode_filename3(struct xdr_stream *xdr, 167 const char *name, u32 length) 168 { 169 __be32 *p; 170 171 WARN_ON_ONCE(length > NFS3_MAXNAMLEN); 172 p = xdr_reserve_space(xdr, 4 + length); 173 xdr_encode_opaque(p, name, length); 174 } 175 176 static int decode_inline_filename3(struct xdr_stream *xdr, 177 const char **name, u32 *length) 178 { 179 __be32 *p; 180 u32 count; 181 182 p = xdr_inline_decode(xdr, 4); 183 if (unlikely(!p)) 184 return -EIO; 185 count = be32_to_cpup(p); 186 if (count > NFS3_MAXNAMLEN) 187 goto out_nametoolong; 188 p = xdr_inline_decode(xdr, count); 189 if (unlikely(!p)) 190 return -EIO; 191 *name = (const char *)p; 192 *length = count; 193 return 0; 194 195 out_nametoolong: 196 dprintk("NFS: returned filename too long: %u\n", count); 197 return -ENAMETOOLONG; 198 } 199 200 /* 201 * nfspath3 202 * 203 * typedef string nfspath3<>; 204 */ 205 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages, 206 const u32 length) 207 { 208 encode_uint32(xdr, length); 209 xdr_write_pages(xdr, pages, 0, length); 210 } 211 212 static int decode_nfspath3(struct xdr_stream *xdr) 213 { 214 u32 recvd, count; 215 __be32 *p; 216 217 p = xdr_inline_decode(xdr, 4); 218 if (unlikely(!p)) 219 return -EIO; 220 count = be32_to_cpup(p); 221 if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN)) 222 goto out_nametoolong; 223 recvd = xdr_read_pages(xdr, count); 224 if (unlikely(count > recvd)) 225 goto out_cheating; 226 xdr_terminate_string(xdr->buf, count); 227 return 0; 228 229 out_nametoolong: 230 dprintk("NFS: returned pathname too long: %u\n", count); 231 return -ENAMETOOLONG; 232 out_cheating: 233 dprintk("NFS: server cheating in pathname result: " 234 "count %u > recvd %u\n", count, recvd); 235 return -EIO; 236 } 237 238 /* 239 * cookie3 240 * 241 * typedef uint64 cookie3 242 */ 243 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie) 244 { 245 return xdr_encode_hyper(p, cookie); 246 } 247 248 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie) 249 { 250 return decode_uint64(xdr, cookie); 251 } 252 253 /* 254 * cookieverf3 255 * 256 * typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE]; 257 */ 258 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier) 259 { 260 memcpy(p, verifier, NFS3_COOKIEVERFSIZE); 261 return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE); 262 } 263 264 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier) 265 { 266 __be32 *p; 267 268 p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE); 269 if (unlikely(!p)) 270 return -EIO; 271 memcpy(verifier, p, NFS3_COOKIEVERFSIZE); 272 return 0; 273 } 274 275 /* 276 * createverf3 277 * 278 * typedef opaque createverf3[NFS3_CREATEVERFSIZE]; 279 */ 280 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier) 281 { 282 __be32 *p; 283 284 p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE); 285 memcpy(p, verifier, NFS3_CREATEVERFSIZE); 286 } 287 288 static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier) 289 { 290 __be32 *p; 291 292 p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE); 293 if (unlikely(!p)) 294 return -EIO; 295 memcpy(verifier->data, p, NFS3_WRITEVERFSIZE); 296 return 0; 297 } 298 299 /* 300 * size3 301 * 302 * typedef uint64 size3; 303 */ 304 static __be32 *xdr_decode_size3(__be32 *p, u64 *size) 305 { 306 return xdr_decode_hyper(p, size); 307 } 308 309 /* 310 * nfsstat3 311 * 312 * enum nfsstat3 { 313 * NFS3_OK = 0, 314 * ... 315 * } 316 */ 317 #define NFS3_OK NFS_OK 318 319 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status) 320 { 321 __be32 *p; 322 323 p = xdr_inline_decode(xdr, 4); 324 if (unlikely(!p)) 325 return -EIO; 326 if (unlikely(*p != cpu_to_be32(NFS3_OK))) 327 goto out_status; 328 *status = 0; 329 return 0; 330 out_status: 331 *status = be32_to_cpup(p); 332 trace_nfs_xdr_status((int)*status); 333 return 0; 334 } 335 336 /* 337 * ftype3 338 * 339 * enum ftype3 { 340 * NF3REG = 1, 341 * NF3DIR = 2, 342 * NF3BLK = 3, 343 * NF3CHR = 4, 344 * NF3LNK = 5, 345 * NF3SOCK = 6, 346 * NF3FIFO = 7 347 * }; 348 */ 349 static void encode_ftype3(struct xdr_stream *xdr, const u32 type) 350 { 351 encode_uint32(xdr, type); 352 } 353 354 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode) 355 { 356 u32 type; 357 358 type = be32_to_cpup(p++); 359 if (type > NF3FIFO) 360 type = NF3NON; 361 *mode = nfs_type2fmt[type]; 362 return p; 363 } 364 365 /* 366 * specdata3 367 * 368 * struct specdata3 { 369 * uint32 specdata1; 370 * uint32 specdata2; 371 * }; 372 */ 373 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev) 374 { 375 __be32 *p; 376 377 p = xdr_reserve_space(xdr, 8); 378 *p++ = cpu_to_be32(MAJOR(rdev)); 379 *p = cpu_to_be32(MINOR(rdev)); 380 } 381 382 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev) 383 { 384 unsigned int major, minor; 385 386 major = be32_to_cpup(p++); 387 minor = be32_to_cpup(p++); 388 *rdev = MKDEV(major, minor); 389 if (MAJOR(*rdev) != major || MINOR(*rdev) != minor) 390 *rdev = 0; 391 return p; 392 } 393 394 /* 395 * nfs_fh3 396 * 397 * struct nfs_fh3 { 398 * opaque data<NFS3_FHSIZE>; 399 * }; 400 */ 401 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh) 402 { 403 __be32 *p; 404 405 WARN_ON_ONCE(fh->size > NFS3_FHSIZE); 406 p = xdr_reserve_space(xdr, 4 + fh->size); 407 xdr_encode_opaque(p, fh->data, fh->size); 408 } 409 410 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh) 411 { 412 u32 length; 413 __be32 *p; 414 415 p = xdr_inline_decode(xdr, 4); 416 if (unlikely(!p)) 417 return -EIO; 418 length = be32_to_cpup(p++); 419 if (unlikely(length > NFS3_FHSIZE)) 420 goto out_toobig; 421 p = xdr_inline_decode(xdr, length); 422 if (unlikely(!p)) 423 return -EIO; 424 fh->size = length; 425 memcpy(fh->data, p, length); 426 return 0; 427 out_toobig: 428 dprintk("NFS: file handle size (%u) too big\n", length); 429 return -E2BIG; 430 } 431 432 static void zero_nfs_fh3(struct nfs_fh *fh) 433 { 434 memset(fh, 0, sizeof(*fh)); 435 } 436 437 /* 438 * nfstime3 439 * 440 * struct nfstime3 { 441 * uint32 seconds; 442 * uint32 nseconds; 443 * }; 444 */ 445 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep) 446 { 447 *p++ = cpu_to_be32(timep->tv_sec); 448 *p++ = cpu_to_be32(timep->tv_nsec); 449 return p; 450 } 451 452 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep) 453 { 454 timep->tv_sec = be32_to_cpup(p++); 455 timep->tv_nsec = be32_to_cpup(p++); 456 return p; 457 } 458 459 /* 460 * sattr3 461 * 462 * enum time_how { 463 * DONT_CHANGE = 0, 464 * SET_TO_SERVER_TIME = 1, 465 * SET_TO_CLIENT_TIME = 2 466 * }; 467 * 468 * union set_mode3 switch (bool set_it) { 469 * case TRUE: 470 * mode3 mode; 471 * default: 472 * void; 473 * }; 474 * 475 * union set_uid3 switch (bool set_it) { 476 * case TRUE: 477 * uid3 uid; 478 * default: 479 * void; 480 * }; 481 * 482 * union set_gid3 switch (bool set_it) { 483 * case TRUE: 484 * gid3 gid; 485 * default: 486 * void; 487 * }; 488 * 489 * union set_size3 switch (bool set_it) { 490 * case TRUE: 491 * size3 size; 492 * default: 493 * void; 494 * }; 495 * 496 * union set_atime switch (time_how set_it) { 497 * case SET_TO_CLIENT_TIME: 498 * nfstime3 atime; 499 * default: 500 * void; 501 * }; 502 * 503 * union set_mtime switch (time_how set_it) { 504 * case SET_TO_CLIENT_TIME: 505 * nfstime3 mtime; 506 * default: 507 * void; 508 * }; 509 * 510 * struct sattr3 { 511 * set_mode3 mode; 512 * set_uid3 uid; 513 * set_gid3 gid; 514 * set_size3 size; 515 * set_atime atime; 516 * set_mtime mtime; 517 * }; 518 */ 519 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr) 520 { 521 struct timespec ts; 522 u32 nbytes; 523 __be32 *p; 524 525 /* 526 * In order to make only a single xdr_reserve_space() call, 527 * pre-compute the total number of bytes to be reserved. 528 * Six boolean values, one for each set_foo field, are always 529 * present in the encoded result, so start there. 530 */ 531 nbytes = 6 * 4; 532 if (attr->ia_valid & ATTR_MODE) 533 nbytes += 4; 534 if (attr->ia_valid & ATTR_UID) 535 nbytes += 4; 536 if (attr->ia_valid & ATTR_GID) 537 nbytes += 4; 538 if (attr->ia_valid & ATTR_SIZE) 539 nbytes += 8; 540 if (attr->ia_valid & ATTR_ATIME_SET) 541 nbytes += 8; 542 if (attr->ia_valid & ATTR_MTIME_SET) 543 nbytes += 8; 544 p = xdr_reserve_space(xdr, nbytes); 545 546 if (attr->ia_valid & ATTR_MODE) { 547 *p++ = xdr_one; 548 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO); 549 } else 550 *p++ = xdr_zero; 551 552 if (attr->ia_valid & ATTR_UID) { 553 *p++ = xdr_one; 554 *p++ = cpu_to_be32(from_kuid(&init_user_ns, attr->ia_uid)); 555 } else 556 *p++ = xdr_zero; 557 558 if (attr->ia_valid & ATTR_GID) { 559 *p++ = xdr_one; 560 *p++ = cpu_to_be32(from_kgid(&init_user_ns, attr->ia_gid)); 561 } else 562 *p++ = xdr_zero; 563 564 if (attr->ia_valid & ATTR_SIZE) { 565 *p++ = xdr_one; 566 p = xdr_encode_hyper(p, (u64)attr->ia_size); 567 } else 568 *p++ = xdr_zero; 569 570 if (attr->ia_valid & ATTR_ATIME_SET) { 571 struct timespec ts; 572 *p++ = xdr_two; 573 ts = timespec64_to_timespec(attr->ia_atime); 574 p = xdr_encode_nfstime3(p, &ts); 575 } else if (attr->ia_valid & ATTR_ATIME) { 576 *p++ = xdr_one; 577 } else 578 *p++ = xdr_zero; 579 580 if (attr->ia_valid & ATTR_MTIME_SET) { 581 *p++ = xdr_two; 582 ts = timespec64_to_timespec(attr->ia_mtime); 583 xdr_encode_nfstime3(p, &ts); 584 } else if (attr->ia_valid & ATTR_MTIME) { 585 *p = xdr_one; 586 } else 587 *p = xdr_zero; 588 } 589 590 /* 591 * fattr3 592 * 593 * struct fattr3 { 594 * ftype3 type; 595 * mode3 mode; 596 * uint32 nlink; 597 * uid3 uid; 598 * gid3 gid; 599 * size3 size; 600 * size3 used; 601 * specdata3 rdev; 602 * uint64 fsid; 603 * fileid3 fileid; 604 * nfstime3 atime; 605 * nfstime3 mtime; 606 * nfstime3 ctime; 607 * }; 608 */ 609 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr) 610 { 611 umode_t fmode; 612 __be32 *p; 613 614 p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2); 615 if (unlikely(!p)) 616 return -EIO; 617 618 p = xdr_decode_ftype3(p, &fmode); 619 620 fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode; 621 fattr->nlink = be32_to_cpup(p++); 622 fattr->uid = make_kuid(&init_user_ns, be32_to_cpup(p++)); 623 if (!uid_valid(fattr->uid)) 624 goto out_uid; 625 fattr->gid = make_kgid(&init_user_ns, be32_to_cpup(p++)); 626 if (!gid_valid(fattr->gid)) 627 goto out_gid; 628 629 p = xdr_decode_size3(p, &fattr->size); 630 p = xdr_decode_size3(p, &fattr->du.nfs3.used); 631 p = xdr_decode_specdata3(p, &fattr->rdev); 632 633 p = xdr_decode_hyper(p, &fattr->fsid.major); 634 fattr->fsid.minor = 0; 635 636 p = xdr_decode_fileid3(p, &fattr->fileid); 637 p = xdr_decode_nfstime3(p, &fattr->atime); 638 p = xdr_decode_nfstime3(p, &fattr->mtime); 639 xdr_decode_nfstime3(p, &fattr->ctime); 640 fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime); 641 642 fattr->valid |= NFS_ATTR_FATTR_V3; 643 return 0; 644 out_uid: 645 dprintk("NFS: returned invalid uid\n"); 646 return -EINVAL; 647 out_gid: 648 dprintk("NFS: returned invalid gid\n"); 649 return -EINVAL; 650 } 651 652 /* 653 * post_op_attr 654 * 655 * union post_op_attr switch (bool attributes_follow) { 656 * case TRUE: 657 * fattr3 attributes; 658 * case FALSE: 659 * void; 660 * }; 661 */ 662 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr) 663 { 664 __be32 *p; 665 666 p = xdr_inline_decode(xdr, 4); 667 if (unlikely(!p)) 668 return -EIO; 669 if (*p != xdr_zero) 670 return decode_fattr3(xdr, fattr); 671 return 0; 672 } 673 674 /* 675 * wcc_attr 676 * struct wcc_attr { 677 * size3 size; 678 * nfstime3 mtime; 679 * nfstime3 ctime; 680 * }; 681 */ 682 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr) 683 { 684 __be32 *p; 685 686 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2); 687 if (unlikely(!p)) 688 return -EIO; 689 690 fattr->valid |= NFS_ATTR_FATTR_PRESIZE 691 | NFS_ATTR_FATTR_PRECHANGE 692 | NFS_ATTR_FATTR_PREMTIME 693 | NFS_ATTR_FATTR_PRECTIME; 694 695 p = xdr_decode_size3(p, &fattr->pre_size); 696 p = xdr_decode_nfstime3(p, &fattr->pre_mtime); 697 xdr_decode_nfstime3(p, &fattr->pre_ctime); 698 fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime); 699 700 return 0; 701 } 702 703 /* 704 * pre_op_attr 705 * union pre_op_attr switch (bool attributes_follow) { 706 * case TRUE: 707 * wcc_attr attributes; 708 * case FALSE: 709 * void; 710 * }; 711 * 712 * wcc_data 713 * 714 * struct wcc_data { 715 * pre_op_attr before; 716 * post_op_attr after; 717 * }; 718 */ 719 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr) 720 { 721 __be32 *p; 722 723 p = xdr_inline_decode(xdr, 4); 724 if (unlikely(!p)) 725 return -EIO; 726 if (*p != xdr_zero) 727 return decode_wcc_attr(xdr, fattr); 728 return 0; 729 } 730 731 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr) 732 { 733 int error; 734 735 error = decode_pre_op_attr(xdr, fattr); 736 if (unlikely(error)) 737 goto out; 738 error = decode_post_op_attr(xdr, fattr); 739 out: 740 return error; 741 } 742 743 /* 744 * post_op_fh3 745 * 746 * union post_op_fh3 switch (bool handle_follows) { 747 * case TRUE: 748 * nfs_fh3 handle; 749 * case FALSE: 750 * void; 751 * }; 752 */ 753 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh) 754 { 755 __be32 *p = xdr_inline_decode(xdr, 4); 756 if (unlikely(!p)) 757 return -EIO; 758 if (*p != xdr_zero) 759 return decode_nfs_fh3(xdr, fh); 760 zero_nfs_fh3(fh); 761 return 0; 762 } 763 764 /* 765 * diropargs3 766 * 767 * struct diropargs3 { 768 * nfs_fh3 dir; 769 * filename3 name; 770 * }; 771 */ 772 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh, 773 const char *name, u32 length) 774 { 775 encode_nfs_fh3(xdr, fh); 776 encode_filename3(xdr, name, length); 777 } 778 779 780 /* 781 * NFSv3 XDR encode functions 782 * 783 * NFSv3 argument types are defined in section 3.3 of RFC 1813: 784 * "NFS Version 3 Protocol Specification". 785 */ 786 787 /* 788 * 3.3.1 GETATTR3args 789 * 790 * struct GETATTR3args { 791 * nfs_fh3 object; 792 * }; 793 */ 794 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req, 795 struct xdr_stream *xdr, 796 const void *data) 797 { 798 const struct nfs_fh *fh = data; 799 800 encode_nfs_fh3(xdr, fh); 801 } 802 803 /* 804 * 3.3.2 SETATTR3args 805 * 806 * union sattrguard3 switch (bool check) { 807 * case TRUE: 808 * nfstime3 obj_ctime; 809 * case FALSE: 810 * void; 811 * }; 812 * 813 * struct SETATTR3args { 814 * nfs_fh3 object; 815 * sattr3 new_attributes; 816 * sattrguard3 guard; 817 * }; 818 */ 819 static void encode_sattrguard3(struct xdr_stream *xdr, 820 const struct nfs3_sattrargs *args) 821 { 822 __be32 *p; 823 824 if (args->guard) { 825 p = xdr_reserve_space(xdr, 4 + 8); 826 *p++ = xdr_one; 827 xdr_encode_nfstime3(p, &args->guardtime); 828 } else { 829 p = xdr_reserve_space(xdr, 4); 830 *p = xdr_zero; 831 } 832 } 833 834 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req, 835 struct xdr_stream *xdr, 836 const void *data) 837 { 838 const struct nfs3_sattrargs *args = data; 839 encode_nfs_fh3(xdr, args->fh); 840 encode_sattr3(xdr, args->sattr); 841 encode_sattrguard3(xdr, args); 842 } 843 844 /* 845 * 3.3.3 LOOKUP3args 846 * 847 * struct LOOKUP3args { 848 * diropargs3 what; 849 * }; 850 */ 851 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req, 852 struct xdr_stream *xdr, 853 const void *data) 854 { 855 const struct nfs3_diropargs *args = data; 856 857 encode_diropargs3(xdr, args->fh, args->name, args->len); 858 } 859 860 /* 861 * 3.3.4 ACCESS3args 862 * 863 * struct ACCESS3args { 864 * nfs_fh3 object; 865 * uint32 access; 866 * }; 867 */ 868 static void encode_access3args(struct xdr_stream *xdr, 869 const struct nfs3_accessargs *args) 870 { 871 encode_nfs_fh3(xdr, args->fh); 872 encode_uint32(xdr, args->access); 873 } 874 875 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req, 876 struct xdr_stream *xdr, 877 const void *data) 878 { 879 const struct nfs3_accessargs *args = data; 880 881 encode_access3args(xdr, args); 882 } 883 884 /* 885 * 3.3.5 READLINK3args 886 * 887 * struct READLINK3args { 888 * nfs_fh3 symlink; 889 * }; 890 */ 891 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req, 892 struct xdr_stream *xdr, 893 const void *data) 894 { 895 const struct nfs3_readlinkargs *args = data; 896 897 encode_nfs_fh3(xdr, args->fh); 898 rpc_prepare_reply_pages(req, args->pages, args->pgbase, 899 args->pglen, NFS3_readlinkres_sz); 900 } 901 902 /* 903 * 3.3.6 READ3args 904 * 905 * struct READ3args { 906 * nfs_fh3 file; 907 * offset3 offset; 908 * count3 count; 909 * }; 910 */ 911 static void encode_read3args(struct xdr_stream *xdr, 912 const struct nfs_pgio_args *args) 913 { 914 __be32 *p; 915 916 encode_nfs_fh3(xdr, args->fh); 917 918 p = xdr_reserve_space(xdr, 8 + 4); 919 p = xdr_encode_hyper(p, args->offset); 920 *p = cpu_to_be32(args->count); 921 } 922 923 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req, 924 struct xdr_stream *xdr, 925 const void *data) 926 { 927 const struct nfs_pgio_args *args = data; 928 unsigned int replen = args->replen ? args->replen : NFS3_readres_sz; 929 930 encode_read3args(xdr, args); 931 rpc_prepare_reply_pages(req, args->pages, args->pgbase, 932 args->count, replen); 933 req->rq_rcv_buf.flags |= XDRBUF_READ; 934 } 935 936 /* 937 * 3.3.7 WRITE3args 938 * 939 * enum stable_how { 940 * UNSTABLE = 0, 941 * DATA_SYNC = 1, 942 * FILE_SYNC = 2 943 * }; 944 * 945 * struct WRITE3args { 946 * nfs_fh3 file; 947 * offset3 offset; 948 * count3 count; 949 * stable_how stable; 950 * opaque data<>; 951 * }; 952 */ 953 static void encode_write3args(struct xdr_stream *xdr, 954 const struct nfs_pgio_args *args) 955 { 956 __be32 *p; 957 958 encode_nfs_fh3(xdr, args->fh); 959 960 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4); 961 p = xdr_encode_hyper(p, args->offset); 962 *p++ = cpu_to_be32(args->count); 963 *p++ = cpu_to_be32(args->stable); 964 *p = cpu_to_be32(args->count); 965 xdr_write_pages(xdr, args->pages, args->pgbase, args->count); 966 } 967 968 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req, 969 struct xdr_stream *xdr, 970 const void *data) 971 { 972 const struct nfs_pgio_args *args = data; 973 974 encode_write3args(xdr, args); 975 xdr->buf->flags |= XDRBUF_WRITE; 976 } 977 978 /* 979 * 3.3.8 CREATE3args 980 * 981 * enum createmode3 { 982 * UNCHECKED = 0, 983 * GUARDED = 1, 984 * EXCLUSIVE = 2 985 * }; 986 * 987 * union createhow3 switch (createmode3 mode) { 988 * case UNCHECKED: 989 * case GUARDED: 990 * sattr3 obj_attributes; 991 * case EXCLUSIVE: 992 * createverf3 verf; 993 * }; 994 * 995 * struct CREATE3args { 996 * diropargs3 where; 997 * createhow3 how; 998 * }; 999 */ 1000 static void encode_createhow3(struct xdr_stream *xdr, 1001 const struct nfs3_createargs *args) 1002 { 1003 encode_uint32(xdr, args->createmode); 1004 switch (args->createmode) { 1005 case NFS3_CREATE_UNCHECKED: 1006 case NFS3_CREATE_GUARDED: 1007 encode_sattr3(xdr, args->sattr); 1008 break; 1009 case NFS3_CREATE_EXCLUSIVE: 1010 encode_createverf3(xdr, args->verifier); 1011 break; 1012 default: 1013 BUG(); 1014 } 1015 } 1016 1017 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req, 1018 struct xdr_stream *xdr, 1019 const void *data) 1020 { 1021 const struct nfs3_createargs *args = data; 1022 1023 encode_diropargs3(xdr, args->fh, args->name, args->len); 1024 encode_createhow3(xdr, args); 1025 } 1026 1027 /* 1028 * 3.3.9 MKDIR3args 1029 * 1030 * struct MKDIR3args { 1031 * diropargs3 where; 1032 * sattr3 attributes; 1033 * }; 1034 */ 1035 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req, 1036 struct xdr_stream *xdr, 1037 const void *data) 1038 { 1039 const struct nfs3_mkdirargs *args = data; 1040 1041 encode_diropargs3(xdr, args->fh, args->name, args->len); 1042 encode_sattr3(xdr, args->sattr); 1043 } 1044 1045 /* 1046 * 3.3.10 SYMLINK3args 1047 * 1048 * struct symlinkdata3 { 1049 * sattr3 symlink_attributes; 1050 * nfspath3 symlink_data; 1051 * }; 1052 * 1053 * struct SYMLINK3args { 1054 * diropargs3 where; 1055 * symlinkdata3 symlink; 1056 * }; 1057 */ 1058 static void encode_symlinkdata3(struct xdr_stream *xdr, 1059 const void *data) 1060 { 1061 const struct nfs3_symlinkargs *args = data; 1062 1063 encode_sattr3(xdr, args->sattr); 1064 encode_nfspath3(xdr, args->pages, args->pathlen); 1065 } 1066 1067 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req, 1068 struct xdr_stream *xdr, 1069 const void *data) 1070 { 1071 const struct nfs3_symlinkargs *args = data; 1072 1073 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen); 1074 encode_symlinkdata3(xdr, args); 1075 xdr->buf->flags |= XDRBUF_WRITE; 1076 } 1077 1078 /* 1079 * 3.3.11 MKNOD3args 1080 * 1081 * struct devicedata3 { 1082 * sattr3 dev_attributes; 1083 * specdata3 spec; 1084 * }; 1085 * 1086 * union mknoddata3 switch (ftype3 type) { 1087 * case NF3CHR: 1088 * case NF3BLK: 1089 * devicedata3 device; 1090 * case NF3SOCK: 1091 * case NF3FIFO: 1092 * sattr3 pipe_attributes; 1093 * default: 1094 * void; 1095 * }; 1096 * 1097 * struct MKNOD3args { 1098 * diropargs3 where; 1099 * mknoddata3 what; 1100 * }; 1101 */ 1102 static void encode_devicedata3(struct xdr_stream *xdr, 1103 const struct nfs3_mknodargs *args) 1104 { 1105 encode_sattr3(xdr, args->sattr); 1106 encode_specdata3(xdr, args->rdev); 1107 } 1108 1109 static void encode_mknoddata3(struct xdr_stream *xdr, 1110 const struct nfs3_mknodargs *args) 1111 { 1112 encode_ftype3(xdr, args->type); 1113 switch (args->type) { 1114 case NF3CHR: 1115 case NF3BLK: 1116 encode_devicedata3(xdr, args); 1117 break; 1118 case NF3SOCK: 1119 case NF3FIFO: 1120 encode_sattr3(xdr, args->sattr); 1121 break; 1122 case NF3REG: 1123 case NF3DIR: 1124 break; 1125 default: 1126 BUG(); 1127 } 1128 } 1129 1130 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req, 1131 struct xdr_stream *xdr, 1132 const void *data) 1133 { 1134 const struct nfs3_mknodargs *args = data; 1135 1136 encode_diropargs3(xdr, args->fh, args->name, args->len); 1137 encode_mknoddata3(xdr, args); 1138 } 1139 1140 /* 1141 * 3.3.12 REMOVE3args 1142 * 1143 * struct REMOVE3args { 1144 * diropargs3 object; 1145 * }; 1146 */ 1147 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req, 1148 struct xdr_stream *xdr, 1149 const void *data) 1150 { 1151 const struct nfs_removeargs *args = data; 1152 1153 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len); 1154 } 1155 1156 /* 1157 * 3.3.14 RENAME3args 1158 * 1159 * struct RENAME3args { 1160 * diropargs3 from; 1161 * diropargs3 to; 1162 * }; 1163 */ 1164 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req, 1165 struct xdr_stream *xdr, 1166 const void *data) 1167 { 1168 const struct nfs_renameargs *args = data; 1169 const struct qstr *old = args->old_name; 1170 const struct qstr *new = args->new_name; 1171 1172 encode_diropargs3(xdr, args->old_dir, old->name, old->len); 1173 encode_diropargs3(xdr, args->new_dir, new->name, new->len); 1174 } 1175 1176 /* 1177 * 3.3.15 LINK3args 1178 * 1179 * struct LINK3args { 1180 * nfs_fh3 file; 1181 * diropargs3 link; 1182 * }; 1183 */ 1184 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req, 1185 struct xdr_stream *xdr, 1186 const void *data) 1187 { 1188 const struct nfs3_linkargs *args = data; 1189 1190 encode_nfs_fh3(xdr, args->fromfh); 1191 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen); 1192 } 1193 1194 /* 1195 * 3.3.16 READDIR3args 1196 * 1197 * struct READDIR3args { 1198 * nfs_fh3 dir; 1199 * cookie3 cookie; 1200 * cookieverf3 cookieverf; 1201 * count3 count; 1202 * }; 1203 */ 1204 static void encode_readdir3args(struct xdr_stream *xdr, 1205 const struct nfs3_readdirargs *args) 1206 { 1207 __be32 *p; 1208 1209 encode_nfs_fh3(xdr, args->fh); 1210 1211 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4); 1212 p = xdr_encode_cookie3(p, args->cookie); 1213 p = xdr_encode_cookieverf3(p, args->verf); 1214 *p = cpu_to_be32(args->count); 1215 } 1216 1217 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req, 1218 struct xdr_stream *xdr, 1219 const void *data) 1220 { 1221 const struct nfs3_readdirargs *args = data; 1222 1223 encode_readdir3args(xdr, args); 1224 rpc_prepare_reply_pages(req, args->pages, 0, 1225 args->count, NFS3_readdirres_sz); 1226 } 1227 1228 /* 1229 * 3.3.17 READDIRPLUS3args 1230 * 1231 * struct READDIRPLUS3args { 1232 * nfs_fh3 dir; 1233 * cookie3 cookie; 1234 * cookieverf3 cookieverf; 1235 * count3 dircount; 1236 * count3 maxcount; 1237 * }; 1238 */ 1239 static void encode_readdirplus3args(struct xdr_stream *xdr, 1240 const struct nfs3_readdirargs *args) 1241 { 1242 __be32 *p; 1243 1244 encode_nfs_fh3(xdr, args->fh); 1245 1246 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4); 1247 p = xdr_encode_cookie3(p, args->cookie); 1248 p = xdr_encode_cookieverf3(p, args->verf); 1249 1250 /* 1251 * readdirplus: need dircount + buffer size. 1252 * We just make sure we make dircount big enough 1253 */ 1254 *p++ = cpu_to_be32(args->count >> 3); 1255 1256 *p = cpu_to_be32(args->count); 1257 } 1258 1259 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req, 1260 struct xdr_stream *xdr, 1261 const void *data) 1262 { 1263 const struct nfs3_readdirargs *args = data; 1264 1265 encode_readdirplus3args(xdr, args); 1266 rpc_prepare_reply_pages(req, args->pages, 0, 1267 args->count, NFS3_readdirres_sz); 1268 } 1269 1270 /* 1271 * 3.3.21 COMMIT3args 1272 * 1273 * struct COMMIT3args { 1274 * nfs_fh3 file; 1275 * offset3 offset; 1276 * count3 count; 1277 * }; 1278 */ 1279 static void encode_commit3args(struct xdr_stream *xdr, 1280 const struct nfs_commitargs *args) 1281 { 1282 __be32 *p; 1283 1284 encode_nfs_fh3(xdr, args->fh); 1285 1286 p = xdr_reserve_space(xdr, 8 + 4); 1287 p = xdr_encode_hyper(p, args->offset); 1288 *p = cpu_to_be32(args->count); 1289 } 1290 1291 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req, 1292 struct xdr_stream *xdr, 1293 const void *data) 1294 { 1295 const struct nfs_commitargs *args = data; 1296 1297 encode_commit3args(xdr, args); 1298 } 1299 1300 #ifdef CONFIG_NFS_V3_ACL 1301 1302 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req, 1303 struct xdr_stream *xdr, 1304 const void *data) 1305 { 1306 const struct nfs3_getaclargs *args = data; 1307 1308 encode_nfs_fh3(xdr, args->fh); 1309 encode_uint32(xdr, args->mask); 1310 if (args->mask & (NFS_ACL | NFS_DFACL)) { 1311 rpc_prepare_reply_pages(req, args->pages, 0, 1312 NFSACL_MAXPAGES << PAGE_SHIFT, 1313 ACL3_getaclres_sz); 1314 req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES; 1315 } 1316 } 1317 1318 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req, 1319 struct xdr_stream *xdr, 1320 const void *data) 1321 { 1322 const struct nfs3_setaclargs *args = data; 1323 unsigned int base; 1324 int error; 1325 1326 encode_nfs_fh3(xdr, NFS_FH(args->inode)); 1327 encode_uint32(xdr, args->mask); 1328 1329 base = req->rq_slen; 1330 if (args->npages != 0) 1331 xdr_write_pages(xdr, args->pages, 0, args->len); 1332 else 1333 xdr_reserve_space(xdr, args->len); 1334 1335 error = nfsacl_encode(xdr->buf, base, args->inode, 1336 (args->mask & NFS_ACL) ? 1337 args->acl_access : NULL, 1, 0); 1338 /* FIXME: this is just broken */ 1339 BUG_ON(error < 0); 1340 error = nfsacl_encode(xdr->buf, base + error, args->inode, 1341 (args->mask & NFS_DFACL) ? 1342 args->acl_default : NULL, 1, 1343 NFS_ACL_DEFAULT); 1344 BUG_ON(error < 0); 1345 } 1346 1347 #endif /* CONFIG_NFS_V3_ACL */ 1348 1349 /* 1350 * NFSv3 XDR decode functions 1351 * 1352 * NFSv3 result types are defined in section 3.3 of RFC 1813: 1353 * "NFS Version 3 Protocol Specification". 1354 */ 1355 1356 /* 1357 * 3.3.1 GETATTR3res 1358 * 1359 * struct GETATTR3resok { 1360 * fattr3 obj_attributes; 1361 * }; 1362 * 1363 * union GETATTR3res switch (nfsstat3 status) { 1364 * case NFS3_OK: 1365 * GETATTR3resok resok; 1366 * default: 1367 * void; 1368 * }; 1369 */ 1370 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req, 1371 struct xdr_stream *xdr, 1372 void *result) 1373 { 1374 enum nfs_stat status; 1375 int error; 1376 1377 error = decode_nfsstat3(xdr, &status); 1378 if (unlikely(error)) 1379 goto out; 1380 if (status != NFS3_OK) 1381 goto out_default; 1382 error = decode_fattr3(xdr, result); 1383 out: 1384 return error; 1385 out_default: 1386 return nfs3_stat_to_errno(status); 1387 } 1388 1389 /* 1390 * 3.3.2 SETATTR3res 1391 * 1392 * struct SETATTR3resok { 1393 * wcc_data obj_wcc; 1394 * }; 1395 * 1396 * struct SETATTR3resfail { 1397 * wcc_data obj_wcc; 1398 * }; 1399 * 1400 * union SETATTR3res switch (nfsstat3 status) { 1401 * case NFS3_OK: 1402 * SETATTR3resok resok; 1403 * default: 1404 * SETATTR3resfail resfail; 1405 * }; 1406 */ 1407 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req, 1408 struct xdr_stream *xdr, 1409 void *result) 1410 { 1411 enum nfs_stat status; 1412 int error; 1413 1414 error = decode_nfsstat3(xdr, &status); 1415 if (unlikely(error)) 1416 goto out; 1417 error = decode_wcc_data(xdr, result); 1418 if (unlikely(error)) 1419 goto out; 1420 if (status != NFS3_OK) 1421 goto out_status; 1422 out: 1423 return error; 1424 out_status: 1425 return nfs3_stat_to_errno(status); 1426 } 1427 1428 /* 1429 * 3.3.3 LOOKUP3res 1430 * 1431 * struct LOOKUP3resok { 1432 * nfs_fh3 object; 1433 * post_op_attr obj_attributes; 1434 * post_op_attr dir_attributes; 1435 * }; 1436 * 1437 * struct LOOKUP3resfail { 1438 * post_op_attr dir_attributes; 1439 * }; 1440 * 1441 * union LOOKUP3res switch (nfsstat3 status) { 1442 * case NFS3_OK: 1443 * LOOKUP3resok resok; 1444 * default: 1445 * LOOKUP3resfail resfail; 1446 * }; 1447 */ 1448 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req, 1449 struct xdr_stream *xdr, 1450 void *data) 1451 { 1452 struct nfs3_diropres *result = data; 1453 enum nfs_stat status; 1454 int error; 1455 1456 error = decode_nfsstat3(xdr, &status); 1457 if (unlikely(error)) 1458 goto out; 1459 if (status != NFS3_OK) 1460 goto out_default; 1461 error = decode_nfs_fh3(xdr, result->fh); 1462 if (unlikely(error)) 1463 goto out; 1464 error = decode_post_op_attr(xdr, result->fattr); 1465 if (unlikely(error)) 1466 goto out; 1467 error = decode_post_op_attr(xdr, result->dir_attr); 1468 out: 1469 return error; 1470 out_default: 1471 error = decode_post_op_attr(xdr, result->dir_attr); 1472 if (unlikely(error)) 1473 goto out; 1474 return nfs3_stat_to_errno(status); 1475 } 1476 1477 /* 1478 * 3.3.4 ACCESS3res 1479 * 1480 * struct ACCESS3resok { 1481 * post_op_attr obj_attributes; 1482 * uint32 access; 1483 * }; 1484 * 1485 * struct ACCESS3resfail { 1486 * post_op_attr obj_attributes; 1487 * }; 1488 * 1489 * union ACCESS3res switch (nfsstat3 status) { 1490 * case NFS3_OK: 1491 * ACCESS3resok resok; 1492 * default: 1493 * ACCESS3resfail resfail; 1494 * }; 1495 */ 1496 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req, 1497 struct xdr_stream *xdr, 1498 void *data) 1499 { 1500 struct nfs3_accessres *result = data; 1501 enum nfs_stat status; 1502 int error; 1503 1504 error = decode_nfsstat3(xdr, &status); 1505 if (unlikely(error)) 1506 goto out; 1507 error = decode_post_op_attr(xdr, result->fattr); 1508 if (unlikely(error)) 1509 goto out; 1510 if (status != NFS3_OK) 1511 goto out_default; 1512 error = decode_uint32(xdr, &result->access); 1513 out: 1514 return error; 1515 out_default: 1516 return nfs3_stat_to_errno(status); 1517 } 1518 1519 /* 1520 * 3.3.5 READLINK3res 1521 * 1522 * struct READLINK3resok { 1523 * post_op_attr symlink_attributes; 1524 * nfspath3 data; 1525 * }; 1526 * 1527 * struct READLINK3resfail { 1528 * post_op_attr symlink_attributes; 1529 * }; 1530 * 1531 * union READLINK3res switch (nfsstat3 status) { 1532 * case NFS3_OK: 1533 * READLINK3resok resok; 1534 * default: 1535 * READLINK3resfail resfail; 1536 * }; 1537 */ 1538 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req, 1539 struct xdr_stream *xdr, 1540 void *result) 1541 { 1542 enum nfs_stat status; 1543 int error; 1544 1545 error = decode_nfsstat3(xdr, &status); 1546 if (unlikely(error)) 1547 goto out; 1548 error = decode_post_op_attr(xdr, result); 1549 if (unlikely(error)) 1550 goto out; 1551 if (status != NFS3_OK) 1552 goto out_default; 1553 error = decode_nfspath3(xdr); 1554 out: 1555 return error; 1556 out_default: 1557 return nfs3_stat_to_errno(status); 1558 } 1559 1560 /* 1561 * 3.3.6 READ3res 1562 * 1563 * struct READ3resok { 1564 * post_op_attr file_attributes; 1565 * count3 count; 1566 * bool eof; 1567 * opaque data<>; 1568 * }; 1569 * 1570 * struct READ3resfail { 1571 * post_op_attr file_attributes; 1572 * }; 1573 * 1574 * union READ3res switch (nfsstat3 status) { 1575 * case NFS3_OK: 1576 * READ3resok resok; 1577 * default: 1578 * READ3resfail resfail; 1579 * }; 1580 */ 1581 static int decode_read3resok(struct xdr_stream *xdr, 1582 struct nfs_pgio_res *result) 1583 { 1584 u32 eof, count, ocount, recvd; 1585 __be32 *p; 1586 1587 p = xdr_inline_decode(xdr, 4 + 4 + 4); 1588 if (unlikely(!p)) 1589 return -EIO; 1590 count = be32_to_cpup(p++); 1591 eof = be32_to_cpup(p++); 1592 ocount = be32_to_cpup(p++); 1593 if (unlikely(ocount != count)) 1594 goto out_mismatch; 1595 recvd = xdr_read_pages(xdr, count); 1596 if (unlikely(count > recvd)) 1597 goto out_cheating; 1598 out: 1599 result->eof = eof; 1600 result->count = count; 1601 return count; 1602 out_mismatch: 1603 dprintk("NFS: READ count doesn't match length of opaque: " 1604 "count %u != ocount %u\n", count, ocount); 1605 return -EIO; 1606 out_cheating: 1607 dprintk("NFS: server cheating in read result: " 1608 "count %u > recvd %u\n", count, recvd); 1609 count = recvd; 1610 eof = 0; 1611 goto out; 1612 } 1613 1614 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr, 1615 void *data) 1616 { 1617 struct nfs_pgio_res *result = data; 1618 unsigned int pos; 1619 enum nfs_stat status; 1620 int error; 1621 1622 pos = xdr_stream_pos(xdr); 1623 error = decode_nfsstat3(xdr, &status); 1624 if (unlikely(error)) 1625 goto out; 1626 error = decode_post_op_attr(xdr, result->fattr); 1627 if (unlikely(error)) 1628 goto out; 1629 result->op_status = status; 1630 if (status != NFS3_OK) 1631 goto out_status; 1632 result->replen = 4 + ((xdr_stream_pos(xdr) - pos) >> 2); 1633 error = decode_read3resok(xdr, result); 1634 out: 1635 return error; 1636 out_status: 1637 return nfs3_stat_to_errno(status); 1638 } 1639 1640 /* 1641 * 3.3.7 WRITE3res 1642 * 1643 * enum stable_how { 1644 * UNSTABLE = 0, 1645 * DATA_SYNC = 1, 1646 * FILE_SYNC = 2 1647 * }; 1648 * 1649 * struct WRITE3resok { 1650 * wcc_data file_wcc; 1651 * count3 count; 1652 * stable_how committed; 1653 * writeverf3 verf; 1654 * }; 1655 * 1656 * struct WRITE3resfail { 1657 * wcc_data file_wcc; 1658 * }; 1659 * 1660 * union WRITE3res switch (nfsstat3 status) { 1661 * case NFS3_OK: 1662 * WRITE3resok resok; 1663 * default: 1664 * WRITE3resfail resfail; 1665 * }; 1666 */ 1667 static int decode_write3resok(struct xdr_stream *xdr, 1668 struct nfs_pgio_res *result) 1669 { 1670 __be32 *p; 1671 1672 p = xdr_inline_decode(xdr, 4 + 4); 1673 if (unlikely(!p)) 1674 return -EIO; 1675 result->count = be32_to_cpup(p++); 1676 result->verf->committed = be32_to_cpup(p++); 1677 if (unlikely(result->verf->committed > NFS_FILE_SYNC)) 1678 goto out_badvalue; 1679 if (decode_writeverf3(xdr, &result->verf->verifier)) 1680 return -EIO; 1681 return result->count; 1682 out_badvalue: 1683 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed); 1684 return -EIO; 1685 } 1686 1687 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr, 1688 void *data) 1689 { 1690 struct nfs_pgio_res *result = data; 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 result->op_status = status; 1701 if (status != NFS3_OK) 1702 goto out_status; 1703 error = decode_write3resok(xdr, result); 1704 out: 1705 return error; 1706 out_status: 1707 return nfs3_stat_to_errno(status); 1708 } 1709 1710 /* 1711 * 3.3.8 CREATE3res 1712 * 1713 * struct CREATE3resok { 1714 * post_op_fh3 obj; 1715 * post_op_attr obj_attributes; 1716 * wcc_data dir_wcc; 1717 * }; 1718 * 1719 * struct CREATE3resfail { 1720 * wcc_data dir_wcc; 1721 * }; 1722 * 1723 * union CREATE3res switch (nfsstat3 status) { 1724 * case NFS3_OK: 1725 * CREATE3resok resok; 1726 * default: 1727 * CREATE3resfail resfail; 1728 * }; 1729 */ 1730 static int decode_create3resok(struct xdr_stream *xdr, 1731 struct nfs3_diropres *result) 1732 { 1733 int error; 1734 1735 error = decode_post_op_fh3(xdr, result->fh); 1736 if (unlikely(error)) 1737 goto out; 1738 error = decode_post_op_attr(xdr, result->fattr); 1739 if (unlikely(error)) 1740 goto out; 1741 /* The server isn't required to return a file handle. 1742 * If it didn't, force the client to perform a LOOKUP 1743 * to determine the correct file handle and attribute 1744 * values for the new object. */ 1745 if (result->fh->size == 0) 1746 result->fattr->valid = 0; 1747 error = decode_wcc_data(xdr, result->dir_attr); 1748 out: 1749 return error; 1750 } 1751 1752 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req, 1753 struct xdr_stream *xdr, 1754 void *data) 1755 { 1756 struct nfs3_diropres *result = data; 1757 enum nfs_stat status; 1758 int error; 1759 1760 error = decode_nfsstat3(xdr, &status); 1761 if (unlikely(error)) 1762 goto out; 1763 if (status != NFS3_OK) 1764 goto out_default; 1765 error = decode_create3resok(xdr, result); 1766 out: 1767 return error; 1768 out_default: 1769 error = decode_wcc_data(xdr, result->dir_attr); 1770 if (unlikely(error)) 1771 goto out; 1772 return nfs3_stat_to_errno(status); 1773 } 1774 1775 /* 1776 * 3.3.12 REMOVE3res 1777 * 1778 * struct REMOVE3resok { 1779 * wcc_data dir_wcc; 1780 * }; 1781 * 1782 * struct REMOVE3resfail { 1783 * wcc_data dir_wcc; 1784 * }; 1785 * 1786 * union REMOVE3res switch (nfsstat3 status) { 1787 * case NFS3_OK: 1788 * REMOVE3resok resok; 1789 * default: 1790 * REMOVE3resfail resfail; 1791 * }; 1792 */ 1793 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req, 1794 struct xdr_stream *xdr, 1795 void *data) 1796 { 1797 struct nfs_removeres *result = data; 1798 enum nfs_stat status; 1799 int error; 1800 1801 error = decode_nfsstat3(xdr, &status); 1802 if (unlikely(error)) 1803 goto out; 1804 error = decode_wcc_data(xdr, result->dir_attr); 1805 if (unlikely(error)) 1806 goto out; 1807 if (status != NFS3_OK) 1808 goto out_status; 1809 out: 1810 return error; 1811 out_status: 1812 return nfs3_stat_to_errno(status); 1813 } 1814 1815 /* 1816 * 3.3.14 RENAME3res 1817 * 1818 * struct RENAME3resok { 1819 * wcc_data fromdir_wcc; 1820 * wcc_data todir_wcc; 1821 * }; 1822 * 1823 * struct RENAME3resfail { 1824 * wcc_data fromdir_wcc; 1825 * wcc_data todir_wcc; 1826 * }; 1827 * 1828 * union RENAME3res switch (nfsstat3 status) { 1829 * case NFS3_OK: 1830 * RENAME3resok resok; 1831 * default: 1832 * RENAME3resfail resfail; 1833 * }; 1834 */ 1835 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req, 1836 struct xdr_stream *xdr, 1837 void *data) 1838 { 1839 struct nfs_renameres *result = data; 1840 enum nfs_stat status; 1841 int error; 1842 1843 error = decode_nfsstat3(xdr, &status); 1844 if (unlikely(error)) 1845 goto out; 1846 error = decode_wcc_data(xdr, result->old_fattr); 1847 if (unlikely(error)) 1848 goto out; 1849 error = decode_wcc_data(xdr, result->new_fattr); 1850 if (unlikely(error)) 1851 goto out; 1852 if (status != NFS3_OK) 1853 goto out_status; 1854 out: 1855 return error; 1856 out_status: 1857 return nfs3_stat_to_errno(status); 1858 } 1859 1860 /* 1861 * 3.3.15 LINK3res 1862 * 1863 * struct LINK3resok { 1864 * post_op_attr file_attributes; 1865 * wcc_data linkdir_wcc; 1866 * }; 1867 * 1868 * struct LINK3resfail { 1869 * post_op_attr file_attributes; 1870 * wcc_data linkdir_wcc; 1871 * }; 1872 * 1873 * union LINK3res switch (nfsstat3 status) { 1874 * case NFS3_OK: 1875 * LINK3resok resok; 1876 * default: 1877 * LINK3resfail resfail; 1878 * }; 1879 */ 1880 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr, 1881 void *data) 1882 { 1883 struct nfs3_linkres *result = data; 1884 enum nfs_stat status; 1885 int error; 1886 1887 error = decode_nfsstat3(xdr, &status); 1888 if (unlikely(error)) 1889 goto out; 1890 error = decode_post_op_attr(xdr, result->fattr); 1891 if (unlikely(error)) 1892 goto out; 1893 error = decode_wcc_data(xdr, result->dir_attr); 1894 if (unlikely(error)) 1895 goto out; 1896 if (status != NFS3_OK) 1897 goto out_status; 1898 out: 1899 return error; 1900 out_status: 1901 return nfs3_stat_to_errno(status); 1902 } 1903 1904 /** 1905 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in 1906 * the local page cache 1907 * @xdr: XDR stream where entry resides 1908 * @entry: buffer to fill in with entry data 1909 * @plus: boolean indicating whether this should be a readdirplus entry 1910 * 1911 * Returns zero if successful, otherwise a negative errno value is 1912 * returned. 1913 * 1914 * This function is not invoked during READDIR reply decoding, but 1915 * rather whenever an application invokes the getdents(2) system call 1916 * on a directory already in our cache. 1917 * 1918 * 3.3.16 entry3 1919 * 1920 * struct entry3 { 1921 * fileid3 fileid; 1922 * filename3 name; 1923 * cookie3 cookie; 1924 * fhandle3 filehandle; 1925 * post_op_attr3 attributes; 1926 * entry3 *nextentry; 1927 * }; 1928 * 1929 * 3.3.17 entryplus3 1930 * struct entryplus3 { 1931 * fileid3 fileid; 1932 * filename3 name; 1933 * cookie3 cookie; 1934 * post_op_attr name_attributes; 1935 * post_op_fh3 name_handle; 1936 * entryplus3 *nextentry; 1937 * }; 1938 */ 1939 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry, 1940 bool plus) 1941 { 1942 struct nfs_entry old = *entry; 1943 __be32 *p; 1944 int error; 1945 u64 new_cookie; 1946 1947 p = xdr_inline_decode(xdr, 4); 1948 if (unlikely(!p)) 1949 return -EAGAIN; 1950 if (*p == xdr_zero) { 1951 p = xdr_inline_decode(xdr, 4); 1952 if (unlikely(!p)) 1953 return -EAGAIN; 1954 if (*p == xdr_zero) 1955 return -EAGAIN; 1956 entry->eof = 1; 1957 return -EBADCOOKIE; 1958 } 1959 1960 error = decode_fileid3(xdr, &entry->ino); 1961 if (unlikely(error)) 1962 return error; 1963 1964 error = decode_inline_filename3(xdr, &entry->name, &entry->len); 1965 if (unlikely(error)) 1966 return error; 1967 1968 error = decode_cookie3(xdr, &new_cookie); 1969 if (unlikely(error)) 1970 return error; 1971 1972 entry->d_type = DT_UNKNOWN; 1973 1974 if (plus) { 1975 entry->fattr->valid = 0; 1976 error = decode_post_op_attr(xdr, entry->fattr); 1977 if (unlikely(error)) 1978 return error; 1979 if (entry->fattr->valid & NFS_ATTR_FATTR_V3) 1980 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode); 1981 1982 if (entry->fattr->fileid != entry->ino) { 1983 entry->fattr->mounted_on_fileid = entry->ino; 1984 entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID; 1985 } 1986 1987 /* In fact, a post_op_fh3: */ 1988 p = xdr_inline_decode(xdr, 4); 1989 if (unlikely(!p)) 1990 return -EAGAIN; 1991 if (*p != xdr_zero) { 1992 error = decode_nfs_fh3(xdr, entry->fh); 1993 if (unlikely(error)) { 1994 if (error == -E2BIG) 1995 goto out_truncated; 1996 return error; 1997 } 1998 } else 1999 zero_nfs_fh3(entry->fh); 2000 } 2001 2002 entry->prev_cookie = entry->cookie; 2003 entry->cookie = new_cookie; 2004 2005 return 0; 2006 2007 out_truncated: 2008 dprintk("NFS: directory entry contains invalid file handle\n"); 2009 *entry = old; 2010 return -EAGAIN; 2011 } 2012 2013 /* 2014 * 3.3.16 READDIR3res 2015 * 2016 * struct dirlist3 { 2017 * entry3 *entries; 2018 * bool eof; 2019 * }; 2020 * 2021 * struct READDIR3resok { 2022 * post_op_attr dir_attributes; 2023 * cookieverf3 cookieverf; 2024 * dirlist3 reply; 2025 * }; 2026 * 2027 * struct READDIR3resfail { 2028 * post_op_attr dir_attributes; 2029 * }; 2030 * 2031 * union READDIR3res switch (nfsstat3 status) { 2032 * case NFS3_OK: 2033 * READDIR3resok resok; 2034 * default: 2035 * READDIR3resfail resfail; 2036 * }; 2037 * 2038 * Read the directory contents into the page cache, but otherwise 2039 * don't touch them. The actual decoding is done by nfs3_decode_entry() 2040 * during subsequent nfs_readdir() calls. 2041 */ 2042 static int decode_dirlist3(struct xdr_stream *xdr) 2043 { 2044 return xdr_read_pages(xdr, xdr->buf->page_len); 2045 } 2046 2047 static int decode_readdir3resok(struct xdr_stream *xdr, 2048 struct nfs3_readdirres *result) 2049 { 2050 int error; 2051 2052 error = decode_post_op_attr(xdr, result->dir_attr); 2053 if (unlikely(error)) 2054 goto out; 2055 /* XXX: do we need to check if result->verf != NULL ? */ 2056 error = decode_cookieverf3(xdr, result->verf); 2057 if (unlikely(error)) 2058 goto out; 2059 error = decode_dirlist3(xdr); 2060 out: 2061 return error; 2062 } 2063 2064 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req, 2065 struct xdr_stream *xdr, 2066 void *data) 2067 { 2068 struct nfs3_readdirres *result = data; 2069 enum nfs_stat status; 2070 int error; 2071 2072 error = decode_nfsstat3(xdr, &status); 2073 if (unlikely(error)) 2074 goto out; 2075 if (status != NFS3_OK) 2076 goto out_default; 2077 error = decode_readdir3resok(xdr, result); 2078 out: 2079 return error; 2080 out_default: 2081 error = decode_post_op_attr(xdr, result->dir_attr); 2082 if (unlikely(error)) 2083 goto out; 2084 return nfs3_stat_to_errno(status); 2085 } 2086 2087 /* 2088 * 3.3.18 FSSTAT3res 2089 * 2090 * struct FSSTAT3resok { 2091 * post_op_attr obj_attributes; 2092 * size3 tbytes; 2093 * size3 fbytes; 2094 * size3 abytes; 2095 * size3 tfiles; 2096 * size3 ffiles; 2097 * size3 afiles; 2098 * uint32 invarsec; 2099 * }; 2100 * 2101 * struct FSSTAT3resfail { 2102 * post_op_attr obj_attributes; 2103 * }; 2104 * 2105 * union FSSTAT3res switch (nfsstat3 status) { 2106 * case NFS3_OK: 2107 * FSSTAT3resok resok; 2108 * default: 2109 * FSSTAT3resfail resfail; 2110 * }; 2111 */ 2112 static int decode_fsstat3resok(struct xdr_stream *xdr, 2113 struct nfs_fsstat *result) 2114 { 2115 __be32 *p; 2116 2117 p = xdr_inline_decode(xdr, 8 * 6 + 4); 2118 if (unlikely(!p)) 2119 return -EIO; 2120 p = xdr_decode_size3(p, &result->tbytes); 2121 p = xdr_decode_size3(p, &result->fbytes); 2122 p = xdr_decode_size3(p, &result->abytes); 2123 p = xdr_decode_size3(p, &result->tfiles); 2124 p = xdr_decode_size3(p, &result->ffiles); 2125 xdr_decode_size3(p, &result->afiles); 2126 /* ignore invarsec */ 2127 return 0; 2128 } 2129 2130 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req, 2131 struct xdr_stream *xdr, 2132 void *data) 2133 { 2134 struct nfs_fsstat *result = data; 2135 enum nfs_stat status; 2136 int error; 2137 2138 error = decode_nfsstat3(xdr, &status); 2139 if (unlikely(error)) 2140 goto out; 2141 error = decode_post_op_attr(xdr, result->fattr); 2142 if (unlikely(error)) 2143 goto out; 2144 if (status != NFS3_OK) 2145 goto out_status; 2146 error = decode_fsstat3resok(xdr, result); 2147 out: 2148 return error; 2149 out_status: 2150 return nfs3_stat_to_errno(status); 2151 } 2152 2153 /* 2154 * 3.3.19 FSINFO3res 2155 * 2156 * struct FSINFO3resok { 2157 * post_op_attr obj_attributes; 2158 * uint32 rtmax; 2159 * uint32 rtpref; 2160 * uint32 rtmult; 2161 * uint32 wtmax; 2162 * uint32 wtpref; 2163 * uint32 wtmult; 2164 * uint32 dtpref; 2165 * size3 maxfilesize; 2166 * nfstime3 time_delta; 2167 * uint32 properties; 2168 * }; 2169 * 2170 * struct FSINFO3resfail { 2171 * post_op_attr obj_attributes; 2172 * }; 2173 * 2174 * union FSINFO3res switch (nfsstat3 status) { 2175 * case NFS3_OK: 2176 * FSINFO3resok resok; 2177 * default: 2178 * FSINFO3resfail resfail; 2179 * }; 2180 */ 2181 static int decode_fsinfo3resok(struct xdr_stream *xdr, 2182 struct nfs_fsinfo *result) 2183 { 2184 __be32 *p; 2185 2186 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4); 2187 if (unlikely(!p)) 2188 return -EIO; 2189 result->rtmax = be32_to_cpup(p++); 2190 result->rtpref = be32_to_cpup(p++); 2191 result->rtmult = be32_to_cpup(p++); 2192 result->wtmax = be32_to_cpup(p++); 2193 result->wtpref = be32_to_cpup(p++); 2194 result->wtmult = be32_to_cpup(p++); 2195 result->dtpref = be32_to_cpup(p++); 2196 p = xdr_decode_size3(p, &result->maxfilesize); 2197 xdr_decode_nfstime3(p, &result->time_delta); 2198 2199 /* ignore properties */ 2200 result->lease_time = 0; 2201 return 0; 2202 } 2203 2204 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req, 2205 struct xdr_stream *xdr, 2206 void *data) 2207 { 2208 struct nfs_fsinfo *result = data; 2209 enum nfs_stat status; 2210 int error; 2211 2212 error = decode_nfsstat3(xdr, &status); 2213 if (unlikely(error)) 2214 goto out; 2215 error = decode_post_op_attr(xdr, result->fattr); 2216 if (unlikely(error)) 2217 goto out; 2218 if (status != NFS3_OK) 2219 goto out_status; 2220 error = decode_fsinfo3resok(xdr, result); 2221 out: 2222 return error; 2223 out_status: 2224 return nfs3_stat_to_errno(status); 2225 } 2226 2227 /* 2228 * 3.3.20 PATHCONF3res 2229 * 2230 * struct PATHCONF3resok { 2231 * post_op_attr obj_attributes; 2232 * uint32 linkmax; 2233 * uint32 name_max; 2234 * bool no_trunc; 2235 * bool chown_restricted; 2236 * bool case_insensitive; 2237 * bool case_preserving; 2238 * }; 2239 * 2240 * struct PATHCONF3resfail { 2241 * post_op_attr obj_attributes; 2242 * }; 2243 * 2244 * union PATHCONF3res switch (nfsstat3 status) { 2245 * case NFS3_OK: 2246 * PATHCONF3resok resok; 2247 * default: 2248 * PATHCONF3resfail resfail; 2249 * }; 2250 */ 2251 static int decode_pathconf3resok(struct xdr_stream *xdr, 2252 struct nfs_pathconf *result) 2253 { 2254 __be32 *p; 2255 2256 p = xdr_inline_decode(xdr, 4 * 6); 2257 if (unlikely(!p)) 2258 return -EIO; 2259 result->max_link = be32_to_cpup(p++); 2260 result->max_namelen = be32_to_cpup(p); 2261 /* ignore remaining fields */ 2262 return 0; 2263 } 2264 2265 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req, 2266 struct xdr_stream *xdr, 2267 void *data) 2268 { 2269 struct nfs_pathconf *result = data; 2270 enum nfs_stat status; 2271 int error; 2272 2273 error = decode_nfsstat3(xdr, &status); 2274 if (unlikely(error)) 2275 goto out; 2276 error = decode_post_op_attr(xdr, result->fattr); 2277 if (unlikely(error)) 2278 goto out; 2279 if (status != NFS3_OK) 2280 goto out_status; 2281 error = decode_pathconf3resok(xdr, result); 2282 out: 2283 return error; 2284 out_status: 2285 return nfs3_stat_to_errno(status); 2286 } 2287 2288 /* 2289 * 3.3.21 COMMIT3res 2290 * 2291 * struct COMMIT3resok { 2292 * wcc_data file_wcc; 2293 * writeverf3 verf; 2294 * }; 2295 * 2296 * struct COMMIT3resfail { 2297 * wcc_data file_wcc; 2298 * }; 2299 * 2300 * union COMMIT3res switch (nfsstat3 status) { 2301 * case NFS3_OK: 2302 * COMMIT3resok resok; 2303 * default: 2304 * COMMIT3resfail resfail; 2305 * }; 2306 */ 2307 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req, 2308 struct xdr_stream *xdr, 2309 void *data) 2310 { 2311 struct nfs_commitres *result = data; 2312 enum nfs_stat status; 2313 int error; 2314 2315 error = decode_nfsstat3(xdr, &status); 2316 if (unlikely(error)) 2317 goto out; 2318 error = decode_wcc_data(xdr, result->fattr); 2319 if (unlikely(error)) 2320 goto out; 2321 result->op_status = status; 2322 if (status != NFS3_OK) 2323 goto out_status; 2324 error = decode_writeverf3(xdr, &result->verf->verifier); 2325 out: 2326 return error; 2327 out_status: 2328 return nfs3_stat_to_errno(status); 2329 } 2330 2331 #ifdef CONFIG_NFS_V3_ACL 2332 2333 static inline int decode_getacl3resok(struct xdr_stream *xdr, 2334 struct nfs3_getaclres *result) 2335 { 2336 struct posix_acl **acl; 2337 unsigned int *aclcnt; 2338 size_t hdrlen; 2339 int error; 2340 2341 error = decode_post_op_attr(xdr, result->fattr); 2342 if (unlikely(error)) 2343 goto out; 2344 error = decode_uint32(xdr, &result->mask); 2345 if (unlikely(error)) 2346 goto out; 2347 error = -EINVAL; 2348 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT)) 2349 goto out; 2350 2351 hdrlen = xdr_stream_pos(xdr); 2352 2353 acl = NULL; 2354 if (result->mask & NFS_ACL) 2355 acl = &result->acl_access; 2356 aclcnt = NULL; 2357 if (result->mask & NFS_ACLCNT) 2358 aclcnt = &result->acl_access_count; 2359 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl); 2360 if (unlikely(error <= 0)) 2361 goto out; 2362 2363 acl = NULL; 2364 if (result->mask & NFS_DFACL) 2365 acl = &result->acl_default; 2366 aclcnt = NULL; 2367 if (result->mask & NFS_DFACLCNT) 2368 aclcnt = &result->acl_default_count; 2369 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl); 2370 if (unlikely(error <= 0)) 2371 return error; 2372 error = 0; 2373 out: 2374 return error; 2375 } 2376 2377 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req, 2378 struct xdr_stream *xdr, 2379 void *result) 2380 { 2381 enum nfs_stat status; 2382 int error; 2383 2384 error = decode_nfsstat3(xdr, &status); 2385 if (unlikely(error)) 2386 goto out; 2387 if (status != NFS3_OK) 2388 goto out_default; 2389 error = decode_getacl3resok(xdr, result); 2390 out: 2391 return error; 2392 out_default: 2393 return nfs3_stat_to_errno(status); 2394 } 2395 2396 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req, 2397 struct xdr_stream *xdr, 2398 void *result) 2399 { 2400 enum nfs_stat status; 2401 int error; 2402 2403 error = decode_nfsstat3(xdr, &status); 2404 if (unlikely(error)) 2405 goto out; 2406 if (status != NFS3_OK) 2407 goto out_default; 2408 error = decode_post_op_attr(xdr, result); 2409 out: 2410 return error; 2411 out_default: 2412 return nfs3_stat_to_errno(status); 2413 } 2414 2415 #endif /* CONFIG_NFS_V3_ACL */ 2416 2417 2418 /* 2419 * We need to translate between nfs status return values and 2420 * the local errno values which may not be the same. 2421 */ 2422 static const struct { 2423 int stat; 2424 int errno; 2425 } nfs_errtbl[] = { 2426 { NFS_OK, 0 }, 2427 { NFSERR_PERM, -EPERM }, 2428 { NFSERR_NOENT, -ENOENT }, 2429 { NFSERR_IO, -errno_NFSERR_IO}, 2430 { NFSERR_NXIO, -ENXIO }, 2431 /* { NFSERR_EAGAIN, -EAGAIN }, */ 2432 { NFSERR_ACCES, -EACCES }, 2433 { NFSERR_EXIST, -EEXIST }, 2434 { NFSERR_XDEV, -EXDEV }, 2435 { NFSERR_NODEV, -ENODEV }, 2436 { NFSERR_NOTDIR, -ENOTDIR }, 2437 { NFSERR_ISDIR, -EISDIR }, 2438 { NFSERR_INVAL, -EINVAL }, 2439 { NFSERR_FBIG, -EFBIG }, 2440 { NFSERR_NOSPC, -ENOSPC }, 2441 { NFSERR_ROFS, -EROFS }, 2442 { NFSERR_MLINK, -EMLINK }, 2443 { NFSERR_NAMETOOLONG, -ENAMETOOLONG }, 2444 { NFSERR_NOTEMPTY, -ENOTEMPTY }, 2445 { NFSERR_DQUOT, -EDQUOT }, 2446 { NFSERR_STALE, -ESTALE }, 2447 { NFSERR_REMOTE, -EREMOTE }, 2448 #ifdef EWFLUSH 2449 { NFSERR_WFLUSH, -EWFLUSH }, 2450 #endif 2451 { NFSERR_BADHANDLE, -EBADHANDLE }, 2452 { NFSERR_NOT_SYNC, -ENOTSYNC }, 2453 { NFSERR_BAD_COOKIE, -EBADCOOKIE }, 2454 { NFSERR_NOTSUPP, -ENOTSUPP }, 2455 { NFSERR_TOOSMALL, -ETOOSMALL }, 2456 { NFSERR_SERVERFAULT, -EREMOTEIO }, 2457 { NFSERR_BADTYPE, -EBADTYPE }, 2458 { NFSERR_JUKEBOX, -EJUKEBOX }, 2459 { -1, -EIO } 2460 }; 2461 2462 /** 2463 * nfs3_stat_to_errno - convert an NFS status code to a local errno 2464 * @status: NFS status code to convert 2465 * 2466 * Returns a local errno value, or -EIO if the NFS status code is 2467 * not recognized. This function is used jointly by NFSv2 and NFSv3. 2468 */ 2469 static int nfs3_stat_to_errno(enum nfs_stat status) 2470 { 2471 int i; 2472 2473 for (i = 0; nfs_errtbl[i].stat != -1; i++) { 2474 if (nfs_errtbl[i].stat == (int)status) 2475 return nfs_errtbl[i].errno; 2476 } 2477 dprintk("NFS: Unrecognized nfs status value: %u\n", status); 2478 return nfs_errtbl[i].errno; 2479 } 2480 2481 2482 #define PROC(proc, argtype, restype, timer) \ 2483 [NFS3PROC_##proc] = { \ 2484 .p_proc = NFS3PROC_##proc, \ 2485 .p_encode = nfs3_xdr_enc_##argtype##3args, \ 2486 .p_decode = nfs3_xdr_dec_##restype##3res, \ 2487 .p_arglen = NFS3_##argtype##args_sz, \ 2488 .p_replen = NFS3_##restype##res_sz, \ 2489 .p_timer = timer, \ 2490 .p_statidx = NFS3PROC_##proc, \ 2491 .p_name = #proc, \ 2492 } 2493 2494 const struct rpc_procinfo nfs3_procedures[] = { 2495 PROC(GETATTR, getattr, getattr, 1), 2496 PROC(SETATTR, setattr, setattr, 0), 2497 PROC(LOOKUP, lookup, lookup, 2), 2498 PROC(ACCESS, access, access, 1), 2499 PROC(READLINK, readlink, readlink, 3), 2500 PROC(READ, read, read, 3), 2501 PROC(WRITE, write, write, 4), 2502 PROC(CREATE, create, create, 0), 2503 PROC(MKDIR, mkdir, create, 0), 2504 PROC(SYMLINK, symlink, create, 0), 2505 PROC(MKNOD, mknod, create, 0), 2506 PROC(REMOVE, remove, remove, 0), 2507 PROC(RMDIR, lookup, setattr, 0), 2508 PROC(RENAME, rename, rename, 0), 2509 PROC(LINK, link, link, 0), 2510 PROC(READDIR, readdir, readdir, 3), 2511 PROC(READDIRPLUS, readdirplus, readdir, 3), 2512 PROC(FSSTAT, getattr, fsstat, 0), 2513 PROC(FSINFO, getattr, fsinfo, 0), 2514 PROC(PATHCONF, getattr, pathconf, 0), 2515 PROC(COMMIT, commit, commit, 5), 2516 }; 2517 2518 static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)]; 2519 const struct rpc_version nfs_version3 = { 2520 .number = 3, 2521 .nrprocs = ARRAY_SIZE(nfs3_procedures), 2522 .procs = nfs3_procedures, 2523 .counts = nfs_version3_counts, 2524 }; 2525 2526 #ifdef CONFIG_NFS_V3_ACL 2527 static const struct rpc_procinfo nfs3_acl_procedures[] = { 2528 [ACLPROC3_GETACL] = { 2529 .p_proc = ACLPROC3_GETACL, 2530 .p_encode = nfs3_xdr_enc_getacl3args, 2531 .p_decode = nfs3_xdr_dec_getacl3res, 2532 .p_arglen = ACL3_getaclargs_sz, 2533 .p_replen = ACL3_getaclres_sz, 2534 .p_timer = 1, 2535 .p_name = "GETACL", 2536 }, 2537 [ACLPROC3_SETACL] = { 2538 .p_proc = ACLPROC3_SETACL, 2539 .p_encode = nfs3_xdr_enc_setacl3args, 2540 .p_decode = nfs3_xdr_dec_setacl3res, 2541 .p_arglen = ACL3_setaclargs_sz, 2542 .p_replen = ACL3_setaclres_sz, 2543 .p_timer = 0, 2544 .p_name = "SETACL", 2545 }, 2546 }; 2547 2548 static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)]; 2549 const struct rpc_version nfsacl_version3 = { 2550 .number = 3, 2551 .nrprocs = ARRAY_SIZE(nfs3_acl_procedures), 2552 .procs = nfs3_acl_procedures, 2553 .counts = nfs3_acl_counts, 2554 }; 2555 #endif /* CONFIG_NFS_V3_ACL */ 2556