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_post_op_fh_sz (1+NFS3_fh_sz) 39 #define NFS3_sattr_sz (15) 40 #define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2)) 41 #define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2)) 42 #define NFS3_fattr_sz (21) 43 #define NFS3_cookieverf_sz (NFS3_COOKIEVERFSIZE>>2) 44 #define NFS3_wcc_attr_sz (6) 45 #define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz) 46 #define NFS3_post_op_attr_sz (1+NFS3_fattr_sz) 47 #define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz) 48 #define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz) 49 50 #define NFS3_getattrargs_sz (NFS3_fh_sz) 51 #define NFS3_setattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3) 52 #define NFS3_lookupargs_sz (NFS3_fh_sz+NFS3_filename_sz) 53 #define NFS3_accessargs_sz (NFS3_fh_sz+1) 54 #define NFS3_readlinkargs_sz (NFS3_fh_sz) 55 #define NFS3_readargs_sz (NFS3_fh_sz+3) 56 #define NFS3_writeargs_sz (NFS3_fh_sz+5) 57 #define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz) 58 #define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz) 59 #define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz) 60 #define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz) 61 #define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz) 62 #define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz) 63 #define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz) 64 #define NFS3_readdirargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+3) 65 #define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4) 66 #define NFS3_commitargs_sz (NFS3_fh_sz+3) 67 68 #define NFS3_getattrres_sz (1+NFS3_fattr_sz) 69 #define NFS3_setattrres_sz (1+NFS3_wcc_data_sz) 70 #define NFS3_removeres_sz (NFS3_setattrres_sz) 71 #define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz)) 72 #define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1) 73 #define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1+1) 74 #define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3+1) 75 #define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4) 76 #define NFS3_createres_sz (1+NFS3_post_op_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz) 77 #define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz)) 78 #define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz) 79 #define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2+1) 80 #define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13) 81 #define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12) 82 #define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6) 83 #define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2) 84 85 #define ACL3_getaclargs_sz (NFS3_fh_sz+1) 86 #define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \ 87 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)) 88 #define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \ 89 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)+1) 90 #define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz) 91 92 static int nfs3_stat_to_errno(enum nfs_stat); 93 94 /* 95 * Map file type to S_IFMT bits 96 */ 97 static const umode_t nfs_type2fmt[] = { 98 [NF3BAD] = 0, 99 [NF3REG] = S_IFREG, 100 [NF3DIR] = S_IFDIR, 101 [NF3BLK] = S_IFBLK, 102 [NF3CHR] = S_IFCHR, 103 [NF3LNK] = S_IFLNK, 104 [NF3SOCK] = S_IFSOCK, 105 [NF3FIFO] = S_IFIFO, 106 }; 107 108 static struct user_namespace *rpc_userns(const struct rpc_clnt *clnt) 109 { 110 if (clnt && clnt->cl_cred) 111 return clnt->cl_cred->user_ns; 112 return &init_user_ns; 113 } 114 115 static struct user_namespace *rpc_rqst_userns(const struct rpc_rqst *rqstp) 116 { 117 if (rqstp->rq_task) 118 return rpc_userns(rqstp->rq_task->tk_client); 119 return &init_user_ns; 120 } 121 122 /* 123 * Encode/decode NFSv3 basic data types 124 * 125 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813: 126 * "NFS Version 3 Protocol Specification". 127 * 128 * Not all basic data types have their own encoding and decoding 129 * functions. For run-time efficiency, some data types are encoded 130 * or decoded inline. 131 */ 132 133 static void encode_uint32(struct xdr_stream *xdr, u32 value) 134 { 135 __be32 *p = xdr_reserve_space(xdr, 4); 136 *p = cpu_to_be32(value); 137 } 138 139 static int decode_uint32(struct xdr_stream *xdr, u32 *value) 140 { 141 __be32 *p; 142 143 p = xdr_inline_decode(xdr, 4); 144 if (unlikely(!p)) 145 return -EIO; 146 *value = be32_to_cpup(p); 147 return 0; 148 } 149 150 static int decode_uint64(struct xdr_stream *xdr, u64 *value) 151 { 152 __be32 *p; 153 154 p = xdr_inline_decode(xdr, 8); 155 if (unlikely(!p)) 156 return -EIO; 157 xdr_decode_hyper(p, value); 158 return 0; 159 } 160 161 /* 162 * fileid3 163 * 164 * typedef uint64 fileid3; 165 */ 166 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid) 167 { 168 return xdr_decode_hyper(p, fileid); 169 } 170 171 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid) 172 { 173 return decode_uint64(xdr, fileid); 174 } 175 176 /* 177 * filename3 178 * 179 * typedef string filename3<>; 180 */ 181 static void encode_filename3(struct xdr_stream *xdr, 182 const char *name, u32 length) 183 { 184 __be32 *p; 185 186 WARN_ON_ONCE(length > NFS3_MAXNAMLEN); 187 p = xdr_reserve_space(xdr, 4 + length); 188 xdr_encode_opaque(p, name, length); 189 } 190 191 static int decode_inline_filename3(struct xdr_stream *xdr, 192 const char **name, u32 *length) 193 { 194 __be32 *p; 195 u32 count; 196 197 p = xdr_inline_decode(xdr, 4); 198 if (unlikely(!p)) 199 return -EIO; 200 count = be32_to_cpup(p); 201 if (count > NFS3_MAXNAMLEN) 202 goto out_nametoolong; 203 p = xdr_inline_decode(xdr, count); 204 if (unlikely(!p)) 205 return -EIO; 206 *name = (const char *)p; 207 *length = count; 208 return 0; 209 210 out_nametoolong: 211 dprintk("NFS: returned filename too long: %u\n", count); 212 return -ENAMETOOLONG; 213 } 214 215 /* 216 * nfspath3 217 * 218 * typedef string nfspath3<>; 219 */ 220 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages, 221 const u32 length) 222 { 223 encode_uint32(xdr, length); 224 xdr_write_pages(xdr, pages, 0, length); 225 } 226 227 static int decode_nfspath3(struct xdr_stream *xdr) 228 { 229 u32 recvd, count; 230 __be32 *p; 231 232 p = xdr_inline_decode(xdr, 4); 233 if (unlikely(!p)) 234 return -EIO; 235 count = be32_to_cpup(p); 236 if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN)) 237 goto out_nametoolong; 238 recvd = xdr_read_pages(xdr, count); 239 if (unlikely(count > recvd)) 240 goto out_cheating; 241 xdr_terminate_string(xdr->buf, count); 242 return 0; 243 244 out_nametoolong: 245 dprintk("NFS: returned pathname too long: %u\n", count); 246 return -ENAMETOOLONG; 247 out_cheating: 248 dprintk("NFS: server cheating in pathname result: " 249 "count %u > recvd %u\n", count, recvd); 250 return -EIO; 251 } 252 253 /* 254 * cookie3 255 * 256 * typedef uint64 cookie3 257 */ 258 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie) 259 { 260 return xdr_encode_hyper(p, cookie); 261 } 262 263 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie) 264 { 265 return decode_uint64(xdr, cookie); 266 } 267 268 /* 269 * cookieverf3 270 * 271 * typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE]; 272 */ 273 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier) 274 { 275 memcpy(p, verifier, NFS3_COOKIEVERFSIZE); 276 return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE); 277 } 278 279 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier) 280 { 281 __be32 *p; 282 283 p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE); 284 if (unlikely(!p)) 285 return -EIO; 286 memcpy(verifier, p, NFS3_COOKIEVERFSIZE); 287 return 0; 288 } 289 290 /* 291 * createverf3 292 * 293 * typedef opaque createverf3[NFS3_CREATEVERFSIZE]; 294 */ 295 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier) 296 { 297 __be32 *p; 298 299 p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE); 300 memcpy(p, verifier, NFS3_CREATEVERFSIZE); 301 } 302 303 static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier) 304 { 305 __be32 *p; 306 307 p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE); 308 if (unlikely(!p)) 309 return -EIO; 310 memcpy(verifier->data, p, NFS3_WRITEVERFSIZE); 311 return 0; 312 } 313 314 /* 315 * size3 316 * 317 * typedef uint64 size3; 318 */ 319 static __be32 *xdr_decode_size3(__be32 *p, u64 *size) 320 { 321 return xdr_decode_hyper(p, size); 322 } 323 324 /* 325 * nfsstat3 326 * 327 * enum nfsstat3 { 328 * NFS3_OK = 0, 329 * ... 330 * } 331 */ 332 #define NFS3_OK NFS_OK 333 334 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status) 335 { 336 __be32 *p; 337 338 p = xdr_inline_decode(xdr, 4); 339 if (unlikely(!p)) 340 return -EIO; 341 if (unlikely(*p != cpu_to_be32(NFS3_OK))) 342 goto out_status; 343 *status = 0; 344 return 0; 345 out_status: 346 *status = be32_to_cpup(p); 347 trace_nfs_xdr_status(xdr, (int)*status); 348 return 0; 349 } 350 351 /* 352 * ftype3 353 * 354 * enum ftype3 { 355 * NF3REG = 1, 356 * NF3DIR = 2, 357 * NF3BLK = 3, 358 * NF3CHR = 4, 359 * NF3LNK = 5, 360 * NF3SOCK = 6, 361 * NF3FIFO = 7 362 * }; 363 */ 364 static void encode_ftype3(struct xdr_stream *xdr, const u32 type) 365 { 366 encode_uint32(xdr, type); 367 } 368 369 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode) 370 { 371 u32 type; 372 373 type = be32_to_cpup(p++); 374 if (type > NF3FIFO) 375 type = NF3NON; 376 *mode = nfs_type2fmt[type]; 377 return p; 378 } 379 380 /* 381 * specdata3 382 * 383 * struct specdata3 { 384 * uint32 specdata1; 385 * uint32 specdata2; 386 * }; 387 */ 388 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev) 389 { 390 __be32 *p; 391 392 p = xdr_reserve_space(xdr, 8); 393 *p++ = cpu_to_be32(MAJOR(rdev)); 394 *p = cpu_to_be32(MINOR(rdev)); 395 } 396 397 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev) 398 { 399 unsigned int major, minor; 400 401 major = be32_to_cpup(p++); 402 minor = be32_to_cpup(p++); 403 *rdev = MKDEV(major, minor); 404 if (MAJOR(*rdev) != major || MINOR(*rdev) != minor) 405 *rdev = 0; 406 return p; 407 } 408 409 /* 410 * nfs_fh3 411 * 412 * struct nfs_fh3 { 413 * opaque data<NFS3_FHSIZE>; 414 * }; 415 */ 416 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh) 417 { 418 __be32 *p; 419 420 WARN_ON_ONCE(fh->size > NFS3_FHSIZE); 421 p = xdr_reserve_space(xdr, 4 + fh->size); 422 xdr_encode_opaque(p, fh->data, fh->size); 423 } 424 425 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh) 426 { 427 u32 length; 428 __be32 *p; 429 430 p = xdr_inline_decode(xdr, 4); 431 if (unlikely(!p)) 432 return -EIO; 433 length = be32_to_cpup(p++); 434 if (unlikely(length > NFS3_FHSIZE)) 435 goto out_toobig; 436 p = xdr_inline_decode(xdr, length); 437 if (unlikely(!p)) 438 return -EIO; 439 fh->size = length; 440 memcpy(fh->data, p, length); 441 return 0; 442 out_toobig: 443 dprintk("NFS: file handle size (%u) too big\n", length); 444 return -E2BIG; 445 } 446 447 static void zero_nfs_fh3(struct nfs_fh *fh) 448 { 449 memset(fh, 0, sizeof(*fh)); 450 } 451 452 /* 453 * nfstime3 454 * 455 * struct nfstime3 { 456 * uint32 seconds; 457 * uint32 nseconds; 458 * }; 459 */ 460 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec64 *timep) 461 { 462 *p++ = cpu_to_be32((u32)timep->tv_sec); 463 *p++ = cpu_to_be32(timep->tv_nsec); 464 return p; 465 } 466 467 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec64 *timep) 468 { 469 timep->tv_sec = be32_to_cpup(p++); 470 timep->tv_nsec = be32_to_cpup(p++); 471 return p; 472 } 473 474 /* 475 * sattr3 476 * 477 * enum time_how { 478 * DONT_CHANGE = 0, 479 * SET_TO_SERVER_TIME = 1, 480 * SET_TO_CLIENT_TIME = 2 481 * }; 482 * 483 * union set_mode3 switch (bool set_it) { 484 * case TRUE: 485 * mode3 mode; 486 * default: 487 * void; 488 * }; 489 * 490 * union set_uid3 switch (bool set_it) { 491 * case TRUE: 492 * uid3 uid; 493 * default: 494 * void; 495 * }; 496 * 497 * union set_gid3 switch (bool set_it) { 498 * case TRUE: 499 * gid3 gid; 500 * default: 501 * void; 502 * }; 503 * 504 * union set_size3 switch (bool set_it) { 505 * case TRUE: 506 * size3 size; 507 * default: 508 * void; 509 * }; 510 * 511 * union set_atime switch (time_how set_it) { 512 * case SET_TO_CLIENT_TIME: 513 * nfstime3 atime; 514 * default: 515 * void; 516 * }; 517 * 518 * union set_mtime switch (time_how set_it) { 519 * case SET_TO_CLIENT_TIME: 520 * nfstime3 mtime; 521 * default: 522 * void; 523 * }; 524 * 525 * struct sattr3 { 526 * set_mode3 mode; 527 * set_uid3 uid; 528 * set_gid3 gid; 529 * set_size3 size; 530 * set_atime atime; 531 * set_mtime mtime; 532 * }; 533 */ 534 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr, 535 struct user_namespace *userns) 536 { 537 u32 nbytes; 538 __be32 *p; 539 540 /* 541 * In order to make only a single xdr_reserve_space() call, 542 * pre-compute the total number of bytes to be reserved. 543 * Six boolean values, one for each set_foo field, are always 544 * present in the encoded result, so start there. 545 */ 546 nbytes = 6 * 4; 547 if (attr->ia_valid & ATTR_MODE) 548 nbytes += 4; 549 if (attr->ia_valid & ATTR_UID) 550 nbytes += 4; 551 if (attr->ia_valid & ATTR_GID) 552 nbytes += 4; 553 if (attr->ia_valid & ATTR_SIZE) 554 nbytes += 8; 555 if (attr->ia_valid & ATTR_ATIME_SET) 556 nbytes += 8; 557 if (attr->ia_valid & ATTR_MTIME_SET) 558 nbytes += 8; 559 p = xdr_reserve_space(xdr, nbytes); 560 561 if (attr->ia_valid & ATTR_MODE) { 562 *p++ = xdr_one; 563 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO); 564 } else 565 *p++ = xdr_zero; 566 567 if (attr->ia_valid & ATTR_UID) { 568 *p++ = xdr_one; 569 *p++ = cpu_to_be32(from_kuid_munged(userns, attr->ia_uid)); 570 } else 571 *p++ = xdr_zero; 572 573 if (attr->ia_valid & ATTR_GID) { 574 *p++ = xdr_one; 575 *p++ = cpu_to_be32(from_kgid_munged(userns, attr->ia_gid)); 576 } else 577 *p++ = xdr_zero; 578 579 if (attr->ia_valid & ATTR_SIZE) { 580 *p++ = xdr_one; 581 p = xdr_encode_hyper(p, (u64)attr->ia_size); 582 } else 583 *p++ = xdr_zero; 584 585 if (attr->ia_valid & ATTR_ATIME_SET) { 586 *p++ = xdr_two; 587 p = xdr_encode_nfstime3(p, &attr->ia_atime); 588 } else if (attr->ia_valid & ATTR_ATIME) { 589 *p++ = xdr_one; 590 } else 591 *p++ = xdr_zero; 592 593 if (attr->ia_valid & ATTR_MTIME_SET) { 594 *p++ = xdr_two; 595 xdr_encode_nfstime3(p, &attr->ia_mtime); 596 } else if (attr->ia_valid & ATTR_MTIME) { 597 *p = xdr_one; 598 } else 599 *p = xdr_zero; 600 } 601 602 /* 603 * fattr3 604 * 605 * struct fattr3 { 606 * ftype3 type; 607 * mode3 mode; 608 * uint32 nlink; 609 * uid3 uid; 610 * gid3 gid; 611 * size3 size; 612 * size3 used; 613 * specdata3 rdev; 614 * uint64 fsid; 615 * fileid3 fileid; 616 * nfstime3 atime; 617 * nfstime3 mtime; 618 * nfstime3 ctime; 619 * }; 620 */ 621 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr, 622 struct user_namespace *userns) 623 { 624 umode_t fmode; 625 __be32 *p; 626 627 p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2); 628 if (unlikely(!p)) 629 return -EIO; 630 631 p = xdr_decode_ftype3(p, &fmode); 632 633 fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode; 634 fattr->nlink = be32_to_cpup(p++); 635 fattr->uid = make_kuid(userns, be32_to_cpup(p++)); 636 if (!uid_valid(fattr->uid)) 637 goto out_uid; 638 fattr->gid = make_kgid(userns, be32_to_cpup(p++)); 639 if (!gid_valid(fattr->gid)) 640 goto out_gid; 641 642 p = xdr_decode_size3(p, &fattr->size); 643 p = xdr_decode_size3(p, &fattr->du.nfs3.used); 644 p = xdr_decode_specdata3(p, &fattr->rdev); 645 646 p = xdr_decode_hyper(p, &fattr->fsid.major); 647 fattr->fsid.minor = 0; 648 649 p = xdr_decode_fileid3(p, &fattr->fileid); 650 p = xdr_decode_nfstime3(p, &fattr->atime); 651 p = xdr_decode_nfstime3(p, &fattr->mtime); 652 xdr_decode_nfstime3(p, &fattr->ctime); 653 fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime); 654 655 fattr->valid |= NFS_ATTR_FATTR_V3; 656 return 0; 657 out_uid: 658 dprintk("NFS: returned invalid uid\n"); 659 return -EINVAL; 660 out_gid: 661 dprintk("NFS: returned invalid gid\n"); 662 return -EINVAL; 663 } 664 665 /* 666 * post_op_attr 667 * 668 * union post_op_attr switch (bool attributes_follow) { 669 * case TRUE: 670 * fattr3 attributes; 671 * case FALSE: 672 * void; 673 * }; 674 */ 675 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr, 676 struct user_namespace *userns) 677 { 678 __be32 *p; 679 680 p = xdr_inline_decode(xdr, 4); 681 if (unlikely(!p)) 682 return -EIO; 683 if (*p != xdr_zero) 684 return decode_fattr3(xdr, fattr, userns); 685 return 0; 686 } 687 688 /* 689 * wcc_attr 690 * struct wcc_attr { 691 * size3 size; 692 * nfstime3 mtime; 693 * nfstime3 ctime; 694 * }; 695 */ 696 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr) 697 { 698 __be32 *p; 699 700 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2); 701 if (unlikely(!p)) 702 return -EIO; 703 704 fattr->valid |= NFS_ATTR_FATTR_PRESIZE 705 | NFS_ATTR_FATTR_PRECHANGE 706 | NFS_ATTR_FATTR_PREMTIME 707 | NFS_ATTR_FATTR_PRECTIME; 708 709 p = xdr_decode_size3(p, &fattr->pre_size); 710 p = xdr_decode_nfstime3(p, &fattr->pre_mtime); 711 xdr_decode_nfstime3(p, &fattr->pre_ctime); 712 fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime); 713 714 return 0; 715 } 716 717 /* 718 * pre_op_attr 719 * union pre_op_attr switch (bool attributes_follow) { 720 * case TRUE: 721 * wcc_attr attributes; 722 * case FALSE: 723 * void; 724 * }; 725 * 726 * wcc_data 727 * 728 * struct wcc_data { 729 * pre_op_attr before; 730 * post_op_attr after; 731 * }; 732 */ 733 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr) 734 { 735 __be32 *p; 736 737 p = xdr_inline_decode(xdr, 4); 738 if (unlikely(!p)) 739 return -EIO; 740 if (*p != xdr_zero) 741 return decode_wcc_attr(xdr, fattr); 742 return 0; 743 } 744 745 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr, 746 struct user_namespace *userns) 747 { 748 int error; 749 750 error = decode_pre_op_attr(xdr, fattr); 751 if (unlikely(error)) 752 goto out; 753 error = decode_post_op_attr(xdr, fattr, userns); 754 out: 755 return error; 756 } 757 758 /* 759 * post_op_fh3 760 * 761 * union post_op_fh3 switch (bool handle_follows) { 762 * case TRUE: 763 * nfs_fh3 handle; 764 * case FALSE: 765 * void; 766 * }; 767 */ 768 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh) 769 { 770 __be32 *p = xdr_inline_decode(xdr, 4); 771 if (unlikely(!p)) 772 return -EIO; 773 if (*p != xdr_zero) 774 return decode_nfs_fh3(xdr, fh); 775 zero_nfs_fh3(fh); 776 return 0; 777 } 778 779 /* 780 * diropargs3 781 * 782 * struct diropargs3 { 783 * nfs_fh3 dir; 784 * filename3 name; 785 * }; 786 */ 787 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh, 788 const char *name, u32 length) 789 { 790 encode_nfs_fh3(xdr, fh); 791 encode_filename3(xdr, name, length); 792 } 793 794 795 /* 796 * NFSv3 XDR encode functions 797 * 798 * NFSv3 argument types are defined in section 3.3 of RFC 1813: 799 * "NFS Version 3 Protocol Specification". 800 */ 801 802 /* 803 * 3.3.1 GETATTR3args 804 * 805 * struct GETATTR3args { 806 * nfs_fh3 object; 807 * }; 808 */ 809 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req, 810 struct xdr_stream *xdr, 811 const void *data) 812 { 813 const struct nfs_fh *fh = data; 814 815 encode_nfs_fh3(xdr, fh); 816 } 817 818 /* 819 * 3.3.2 SETATTR3args 820 * 821 * union sattrguard3 switch (bool check) { 822 * case TRUE: 823 * nfstime3 obj_ctime; 824 * case FALSE: 825 * void; 826 * }; 827 * 828 * struct SETATTR3args { 829 * nfs_fh3 object; 830 * sattr3 new_attributes; 831 * sattrguard3 guard; 832 * }; 833 */ 834 static void encode_sattrguard3(struct xdr_stream *xdr, 835 const struct nfs3_sattrargs *args) 836 { 837 __be32 *p; 838 839 if (args->guard) { 840 p = xdr_reserve_space(xdr, 4 + 8); 841 *p++ = xdr_one; 842 xdr_encode_nfstime3(p, &args->guardtime); 843 } else { 844 p = xdr_reserve_space(xdr, 4); 845 *p = xdr_zero; 846 } 847 } 848 849 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req, 850 struct xdr_stream *xdr, 851 const void *data) 852 { 853 const struct nfs3_sattrargs *args = data; 854 encode_nfs_fh3(xdr, args->fh); 855 encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req)); 856 encode_sattrguard3(xdr, args); 857 } 858 859 /* 860 * 3.3.3 LOOKUP3args 861 * 862 * struct LOOKUP3args { 863 * diropargs3 what; 864 * }; 865 */ 866 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req, 867 struct xdr_stream *xdr, 868 const void *data) 869 { 870 const struct nfs3_diropargs *args = data; 871 872 encode_diropargs3(xdr, args->fh, args->name, args->len); 873 } 874 875 /* 876 * 3.3.4 ACCESS3args 877 * 878 * struct ACCESS3args { 879 * nfs_fh3 object; 880 * uint32 access; 881 * }; 882 */ 883 static void encode_access3args(struct xdr_stream *xdr, 884 const struct nfs3_accessargs *args) 885 { 886 encode_nfs_fh3(xdr, args->fh); 887 encode_uint32(xdr, args->access); 888 } 889 890 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req, 891 struct xdr_stream *xdr, 892 const void *data) 893 { 894 const struct nfs3_accessargs *args = data; 895 896 encode_access3args(xdr, args); 897 } 898 899 /* 900 * 3.3.5 READLINK3args 901 * 902 * struct READLINK3args { 903 * nfs_fh3 symlink; 904 * }; 905 */ 906 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req, 907 struct xdr_stream *xdr, 908 const void *data) 909 { 910 const struct nfs3_readlinkargs *args = data; 911 912 encode_nfs_fh3(xdr, args->fh); 913 rpc_prepare_reply_pages(req, args->pages, args->pgbase, 914 args->pglen, NFS3_readlinkres_sz); 915 } 916 917 /* 918 * 3.3.6 READ3args 919 * 920 * struct READ3args { 921 * nfs_fh3 file; 922 * offset3 offset; 923 * count3 count; 924 * }; 925 */ 926 static void encode_read3args(struct xdr_stream *xdr, 927 const struct nfs_pgio_args *args) 928 { 929 __be32 *p; 930 931 encode_nfs_fh3(xdr, args->fh); 932 933 p = xdr_reserve_space(xdr, 8 + 4); 934 p = xdr_encode_hyper(p, args->offset); 935 *p = cpu_to_be32(args->count); 936 } 937 938 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req, 939 struct xdr_stream *xdr, 940 const void *data) 941 { 942 const struct nfs_pgio_args *args = data; 943 unsigned int replen = args->replen ? args->replen : NFS3_readres_sz; 944 945 encode_read3args(xdr, args); 946 rpc_prepare_reply_pages(req, args->pages, args->pgbase, 947 args->count, replen); 948 req->rq_rcv_buf.flags |= XDRBUF_READ; 949 } 950 951 /* 952 * 3.3.7 WRITE3args 953 * 954 * enum stable_how { 955 * UNSTABLE = 0, 956 * DATA_SYNC = 1, 957 * FILE_SYNC = 2 958 * }; 959 * 960 * struct WRITE3args { 961 * nfs_fh3 file; 962 * offset3 offset; 963 * count3 count; 964 * stable_how stable; 965 * opaque data<>; 966 * }; 967 */ 968 static void encode_write3args(struct xdr_stream *xdr, 969 const struct nfs_pgio_args *args) 970 { 971 __be32 *p; 972 973 encode_nfs_fh3(xdr, args->fh); 974 975 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4); 976 p = xdr_encode_hyper(p, args->offset); 977 *p++ = cpu_to_be32(args->count); 978 *p++ = cpu_to_be32(args->stable); 979 *p = cpu_to_be32(args->count); 980 xdr_write_pages(xdr, args->pages, args->pgbase, args->count); 981 } 982 983 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req, 984 struct xdr_stream *xdr, 985 const void *data) 986 { 987 const struct nfs_pgio_args *args = data; 988 989 encode_write3args(xdr, args); 990 xdr->buf->flags |= XDRBUF_WRITE; 991 } 992 993 /* 994 * 3.3.8 CREATE3args 995 * 996 * enum createmode3 { 997 * UNCHECKED = 0, 998 * GUARDED = 1, 999 * EXCLUSIVE = 2 1000 * }; 1001 * 1002 * union createhow3 switch (createmode3 mode) { 1003 * case UNCHECKED: 1004 * case GUARDED: 1005 * sattr3 obj_attributes; 1006 * case EXCLUSIVE: 1007 * createverf3 verf; 1008 * }; 1009 * 1010 * struct CREATE3args { 1011 * diropargs3 where; 1012 * createhow3 how; 1013 * }; 1014 */ 1015 static void encode_createhow3(struct xdr_stream *xdr, 1016 const struct nfs3_createargs *args, 1017 struct user_namespace *userns) 1018 { 1019 encode_uint32(xdr, args->createmode); 1020 switch (args->createmode) { 1021 case NFS3_CREATE_UNCHECKED: 1022 case NFS3_CREATE_GUARDED: 1023 encode_sattr3(xdr, args->sattr, userns); 1024 break; 1025 case NFS3_CREATE_EXCLUSIVE: 1026 encode_createverf3(xdr, args->verifier); 1027 break; 1028 default: 1029 BUG(); 1030 } 1031 } 1032 1033 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req, 1034 struct xdr_stream *xdr, 1035 const void *data) 1036 { 1037 const struct nfs3_createargs *args = data; 1038 1039 encode_diropargs3(xdr, args->fh, args->name, args->len); 1040 encode_createhow3(xdr, args, rpc_rqst_userns(req)); 1041 } 1042 1043 /* 1044 * 3.3.9 MKDIR3args 1045 * 1046 * struct MKDIR3args { 1047 * diropargs3 where; 1048 * sattr3 attributes; 1049 * }; 1050 */ 1051 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req, 1052 struct xdr_stream *xdr, 1053 const void *data) 1054 { 1055 const struct nfs3_mkdirargs *args = data; 1056 1057 encode_diropargs3(xdr, args->fh, args->name, args->len); 1058 encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req)); 1059 } 1060 1061 /* 1062 * 3.3.10 SYMLINK3args 1063 * 1064 * struct symlinkdata3 { 1065 * sattr3 symlink_attributes; 1066 * nfspath3 symlink_data; 1067 * }; 1068 * 1069 * struct SYMLINK3args { 1070 * diropargs3 where; 1071 * symlinkdata3 symlink; 1072 * }; 1073 */ 1074 static void encode_symlinkdata3(struct xdr_stream *xdr, 1075 const void *data, 1076 struct user_namespace *userns) 1077 { 1078 const struct nfs3_symlinkargs *args = data; 1079 1080 encode_sattr3(xdr, args->sattr, userns); 1081 encode_nfspath3(xdr, args->pages, args->pathlen); 1082 } 1083 1084 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req, 1085 struct xdr_stream *xdr, 1086 const void *data) 1087 { 1088 const struct nfs3_symlinkargs *args = data; 1089 1090 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen); 1091 encode_symlinkdata3(xdr, args, rpc_rqst_userns(req)); 1092 xdr->buf->flags |= XDRBUF_WRITE; 1093 } 1094 1095 /* 1096 * 3.3.11 MKNOD3args 1097 * 1098 * struct devicedata3 { 1099 * sattr3 dev_attributes; 1100 * specdata3 spec; 1101 * }; 1102 * 1103 * union mknoddata3 switch (ftype3 type) { 1104 * case NF3CHR: 1105 * case NF3BLK: 1106 * devicedata3 device; 1107 * case NF3SOCK: 1108 * case NF3FIFO: 1109 * sattr3 pipe_attributes; 1110 * default: 1111 * void; 1112 * }; 1113 * 1114 * struct MKNOD3args { 1115 * diropargs3 where; 1116 * mknoddata3 what; 1117 * }; 1118 */ 1119 static void encode_devicedata3(struct xdr_stream *xdr, 1120 const struct nfs3_mknodargs *args, 1121 struct user_namespace *userns) 1122 { 1123 encode_sattr3(xdr, args->sattr, userns); 1124 encode_specdata3(xdr, args->rdev); 1125 } 1126 1127 static void encode_mknoddata3(struct xdr_stream *xdr, 1128 const struct nfs3_mknodargs *args, 1129 struct user_namespace *userns) 1130 { 1131 encode_ftype3(xdr, args->type); 1132 switch (args->type) { 1133 case NF3CHR: 1134 case NF3BLK: 1135 encode_devicedata3(xdr, args, userns); 1136 break; 1137 case NF3SOCK: 1138 case NF3FIFO: 1139 encode_sattr3(xdr, args->sattr, userns); 1140 break; 1141 case NF3REG: 1142 case NF3DIR: 1143 break; 1144 default: 1145 BUG(); 1146 } 1147 } 1148 1149 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req, 1150 struct xdr_stream *xdr, 1151 const void *data) 1152 { 1153 const struct nfs3_mknodargs *args = data; 1154 1155 encode_diropargs3(xdr, args->fh, args->name, args->len); 1156 encode_mknoddata3(xdr, args, rpc_rqst_userns(req)); 1157 } 1158 1159 /* 1160 * 3.3.12 REMOVE3args 1161 * 1162 * struct REMOVE3args { 1163 * diropargs3 object; 1164 * }; 1165 */ 1166 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req, 1167 struct xdr_stream *xdr, 1168 const void *data) 1169 { 1170 const struct nfs_removeargs *args = data; 1171 1172 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len); 1173 } 1174 1175 /* 1176 * 3.3.14 RENAME3args 1177 * 1178 * struct RENAME3args { 1179 * diropargs3 from; 1180 * diropargs3 to; 1181 * }; 1182 */ 1183 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req, 1184 struct xdr_stream *xdr, 1185 const void *data) 1186 { 1187 const struct nfs_renameargs *args = data; 1188 const struct qstr *old = args->old_name; 1189 const struct qstr *new = args->new_name; 1190 1191 encode_diropargs3(xdr, args->old_dir, old->name, old->len); 1192 encode_diropargs3(xdr, args->new_dir, new->name, new->len); 1193 } 1194 1195 /* 1196 * 3.3.15 LINK3args 1197 * 1198 * struct LINK3args { 1199 * nfs_fh3 file; 1200 * diropargs3 link; 1201 * }; 1202 */ 1203 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req, 1204 struct xdr_stream *xdr, 1205 const void *data) 1206 { 1207 const struct nfs3_linkargs *args = data; 1208 1209 encode_nfs_fh3(xdr, args->fromfh); 1210 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen); 1211 } 1212 1213 /* 1214 * 3.3.16 READDIR3args 1215 * 1216 * struct READDIR3args { 1217 * nfs_fh3 dir; 1218 * cookie3 cookie; 1219 * cookieverf3 cookieverf; 1220 * count3 count; 1221 * }; 1222 */ 1223 static void encode_readdir3args(struct xdr_stream *xdr, 1224 const struct nfs3_readdirargs *args) 1225 { 1226 __be32 *p; 1227 1228 encode_nfs_fh3(xdr, args->fh); 1229 1230 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4); 1231 p = xdr_encode_cookie3(p, args->cookie); 1232 p = xdr_encode_cookieverf3(p, args->verf); 1233 *p = cpu_to_be32(args->count); 1234 } 1235 1236 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req, 1237 struct xdr_stream *xdr, 1238 const void *data) 1239 { 1240 const struct nfs3_readdirargs *args = data; 1241 1242 encode_readdir3args(xdr, args); 1243 rpc_prepare_reply_pages(req, args->pages, 0, 1244 args->count, NFS3_readdirres_sz); 1245 } 1246 1247 /* 1248 * 3.3.17 READDIRPLUS3args 1249 * 1250 * struct READDIRPLUS3args { 1251 * nfs_fh3 dir; 1252 * cookie3 cookie; 1253 * cookieverf3 cookieverf; 1254 * count3 dircount; 1255 * count3 maxcount; 1256 * }; 1257 */ 1258 static void encode_readdirplus3args(struct xdr_stream *xdr, 1259 const struct nfs3_readdirargs *args) 1260 { 1261 __be32 *p; 1262 1263 encode_nfs_fh3(xdr, args->fh); 1264 1265 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4); 1266 p = xdr_encode_cookie3(p, args->cookie); 1267 p = xdr_encode_cookieverf3(p, args->verf); 1268 1269 /* 1270 * readdirplus: need dircount + buffer size. 1271 * We just make sure we make dircount big enough 1272 */ 1273 *p++ = cpu_to_be32(args->count >> 3); 1274 1275 *p = cpu_to_be32(args->count); 1276 } 1277 1278 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req, 1279 struct xdr_stream *xdr, 1280 const void *data) 1281 { 1282 const struct nfs3_readdirargs *args = data; 1283 1284 encode_readdirplus3args(xdr, args); 1285 rpc_prepare_reply_pages(req, args->pages, 0, 1286 args->count, NFS3_readdirres_sz); 1287 } 1288 1289 /* 1290 * 3.3.21 COMMIT3args 1291 * 1292 * struct COMMIT3args { 1293 * nfs_fh3 file; 1294 * offset3 offset; 1295 * count3 count; 1296 * }; 1297 */ 1298 static void encode_commit3args(struct xdr_stream *xdr, 1299 const struct nfs_commitargs *args) 1300 { 1301 __be32 *p; 1302 1303 encode_nfs_fh3(xdr, args->fh); 1304 1305 p = xdr_reserve_space(xdr, 8 + 4); 1306 p = xdr_encode_hyper(p, args->offset); 1307 *p = cpu_to_be32(args->count); 1308 } 1309 1310 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req, 1311 struct xdr_stream *xdr, 1312 const void *data) 1313 { 1314 const struct nfs_commitargs *args = data; 1315 1316 encode_commit3args(xdr, args); 1317 } 1318 1319 #ifdef CONFIG_NFS_V3_ACL 1320 1321 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req, 1322 struct xdr_stream *xdr, 1323 const void *data) 1324 { 1325 const struct nfs3_getaclargs *args = data; 1326 1327 encode_nfs_fh3(xdr, args->fh); 1328 encode_uint32(xdr, args->mask); 1329 if (args->mask & (NFS_ACL | NFS_DFACL)) { 1330 rpc_prepare_reply_pages(req, args->pages, 0, 1331 NFSACL_MAXPAGES << PAGE_SHIFT, 1332 ACL3_getaclres_sz); 1333 req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES; 1334 } 1335 } 1336 1337 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req, 1338 struct xdr_stream *xdr, 1339 const void *data) 1340 { 1341 const struct nfs3_setaclargs *args = data; 1342 unsigned int base; 1343 int error; 1344 1345 encode_nfs_fh3(xdr, NFS_FH(args->inode)); 1346 encode_uint32(xdr, args->mask); 1347 1348 base = req->rq_slen; 1349 if (args->npages != 0) 1350 xdr_write_pages(xdr, args->pages, 0, args->len); 1351 else 1352 xdr_reserve_space(xdr, args->len); 1353 1354 error = nfsacl_encode(xdr->buf, base, args->inode, 1355 (args->mask & NFS_ACL) ? 1356 args->acl_access : NULL, 1, 0); 1357 /* FIXME: this is just broken */ 1358 BUG_ON(error < 0); 1359 error = nfsacl_encode(xdr->buf, base + error, args->inode, 1360 (args->mask & NFS_DFACL) ? 1361 args->acl_default : NULL, 1, 1362 NFS_ACL_DEFAULT); 1363 BUG_ON(error < 0); 1364 } 1365 1366 #endif /* CONFIG_NFS_V3_ACL */ 1367 1368 /* 1369 * NFSv3 XDR decode functions 1370 * 1371 * NFSv3 result types are defined in section 3.3 of RFC 1813: 1372 * "NFS Version 3 Protocol Specification". 1373 */ 1374 1375 /* 1376 * 3.3.1 GETATTR3res 1377 * 1378 * struct GETATTR3resok { 1379 * fattr3 obj_attributes; 1380 * }; 1381 * 1382 * union GETATTR3res switch (nfsstat3 status) { 1383 * case NFS3_OK: 1384 * GETATTR3resok resok; 1385 * default: 1386 * void; 1387 * }; 1388 */ 1389 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req, 1390 struct xdr_stream *xdr, 1391 void *result) 1392 { 1393 enum nfs_stat status; 1394 int error; 1395 1396 error = decode_nfsstat3(xdr, &status); 1397 if (unlikely(error)) 1398 goto out; 1399 if (status != NFS3_OK) 1400 goto out_default; 1401 error = decode_fattr3(xdr, result, rpc_rqst_userns(req)); 1402 out: 1403 return error; 1404 out_default: 1405 return nfs3_stat_to_errno(status); 1406 } 1407 1408 /* 1409 * 3.3.2 SETATTR3res 1410 * 1411 * struct SETATTR3resok { 1412 * wcc_data obj_wcc; 1413 * }; 1414 * 1415 * struct SETATTR3resfail { 1416 * wcc_data obj_wcc; 1417 * }; 1418 * 1419 * union SETATTR3res switch (nfsstat3 status) { 1420 * case NFS3_OK: 1421 * SETATTR3resok resok; 1422 * default: 1423 * SETATTR3resfail resfail; 1424 * }; 1425 */ 1426 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req, 1427 struct xdr_stream *xdr, 1428 void *result) 1429 { 1430 enum nfs_stat status; 1431 int error; 1432 1433 error = decode_nfsstat3(xdr, &status); 1434 if (unlikely(error)) 1435 goto out; 1436 error = decode_wcc_data(xdr, result, rpc_rqst_userns(req)); 1437 if (unlikely(error)) 1438 goto out; 1439 if (status != NFS3_OK) 1440 goto out_status; 1441 out: 1442 return error; 1443 out_status: 1444 return nfs3_stat_to_errno(status); 1445 } 1446 1447 /* 1448 * 3.3.3 LOOKUP3res 1449 * 1450 * struct LOOKUP3resok { 1451 * nfs_fh3 object; 1452 * post_op_attr obj_attributes; 1453 * post_op_attr dir_attributes; 1454 * }; 1455 * 1456 * struct LOOKUP3resfail { 1457 * post_op_attr dir_attributes; 1458 * }; 1459 * 1460 * union LOOKUP3res switch (nfsstat3 status) { 1461 * case NFS3_OK: 1462 * LOOKUP3resok resok; 1463 * default: 1464 * LOOKUP3resfail resfail; 1465 * }; 1466 */ 1467 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req, 1468 struct xdr_stream *xdr, 1469 void *data) 1470 { 1471 struct user_namespace *userns = rpc_rqst_userns(req); 1472 struct nfs3_diropres *result = data; 1473 enum nfs_stat status; 1474 int error; 1475 1476 error = decode_nfsstat3(xdr, &status); 1477 if (unlikely(error)) 1478 goto out; 1479 if (status != NFS3_OK) 1480 goto out_default; 1481 error = decode_nfs_fh3(xdr, result->fh); 1482 if (unlikely(error)) 1483 goto out; 1484 error = decode_post_op_attr(xdr, result->fattr, userns); 1485 if (unlikely(error)) 1486 goto out; 1487 error = decode_post_op_attr(xdr, result->dir_attr, userns); 1488 out: 1489 return error; 1490 out_default: 1491 error = decode_post_op_attr(xdr, result->dir_attr, userns); 1492 if (unlikely(error)) 1493 goto out; 1494 return nfs3_stat_to_errno(status); 1495 } 1496 1497 /* 1498 * 3.3.4 ACCESS3res 1499 * 1500 * struct ACCESS3resok { 1501 * post_op_attr obj_attributes; 1502 * uint32 access; 1503 * }; 1504 * 1505 * struct ACCESS3resfail { 1506 * post_op_attr obj_attributes; 1507 * }; 1508 * 1509 * union ACCESS3res switch (nfsstat3 status) { 1510 * case NFS3_OK: 1511 * ACCESS3resok resok; 1512 * default: 1513 * ACCESS3resfail resfail; 1514 * }; 1515 */ 1516 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req, 1517 struct xdr_stream *xdr, 1518 void *data) 1519 { 1520 struct nfs3_accessres *result = data; 1521 enum nfs_stat status; 1522 int error; 1523 1524 error = decode_nfsstat3(xdr, &status); 1525 if (unlikely(error)) 1526 goto out; 1527 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req)); 1528 if (unlikely(error)) 1529 goto out; 1530 if (status != NFS3_OK) 1531 goto out_default; 1532 error = decode_uint32(xdr, &result->access); 1533 out: 1534 return error; 1535 out_default: 1536 return nfs3_stat_to_errno(status); 1537 } 1538 1539 /* 1540 * 3.3.5 READLINK3res 1541 * 1542 * struct READLINK3resok { 1543 * post_op_attr symlink_attributes; 1544 * nfspath3 data; 1545 * }; 1546 * 1547 * struct READLINK3resfail { 1548 * post_op_attr symlink_attributes; 1549 * }; 1550 * 1551 * union READLINK3res switch (nfsstat3 status) { 1552 * case NFS3_OK: 1553 * READLINK3resok resok; 1554 * default: 1555 * READLINK3resfail resfail; 1556 * }; 1557 */ 1558 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req, 1559 struct xdr_stream *xdr, 1560 void *result) 1561 { 1562 enum nfs_stat status; 1563 int error; 1564 1565 error = decode_nfsstat3(xdr, &status); 1566 if (unlikely(error)) 1567 goto out; 1568 error = decode_post_op_attr(xdr, result, rpc_rqst_userns(req)); 1569 if (unlikely(error)) 1570 goto out; 1571 if (status != NFS3_OK) 1572 goto out_default; 1573 error = decode_nfspath3(xdr); 1574 out: 1575 return error; 1576 out_default: 1577 return nfs3_stat_to_errno(status); 1578 } 1579 1580 /* 1581 * 3.3.6 READ3res 1582 * 1583 * struct READ3resok { 1584 * post_op_attr file_attributes; 1585 * count3 count; 1586 * bool eof; 1587 * opaque data<>; 1588 * }; 1589 * 1590 * struct READ3resfail { 1591 * post_op_attr file_attributes; 1592 * }; 1593 * 1594 * union READ3res switch (nfsstat3 status) { 1595 * case NFS3_OK: 1596 * READ3resok resok; 1597 * default: 1598 * READ3resfail resfail; 1599 * }; 1600 */ 1601 static int decode_read3resok(struct xdr_stream *xdr, 1602 struct nfs_pgio_res *result) 1603 { 1604 u32 eof, count, ocount, recvd; 1605 __be32 *p; 1606 1607 p = xdr_inline_decode(xdr, 4 + 4 + 4); 1608 if (unlikely(!p)) 1609 return -EIO; 1610 count = be32_to_cpup(p++); 1611 eof = be32_to_cpup(p++); 1612 ocount = be32_to_cpup(p++); 1613 if (unlikely(ocount != count)) 1614 goto out_mismatch; 1615 recvd = xdr_read_pages(xdr, count); 1616 if (unlikely(count > recvd)) 1617 goto out_cheating; 1618 out: 1619 result->eof = eof; 1620 result->count = count; 1621 return count; 1622 out_mismatch: 1623 dprintk("NFS: READ count doesn't match length of opaque: " 1624 "count %u != ocount %u\n", count, ocount); 1625 return -EIO; 1626 out_cheating: 1627 dprintk("NFS: server cheating in read result: " 1628 "count %u > recvd %u\n", count, recvd); 1629 count = recvd; 1630 eof = 0; 1631 goto out; 1632 } 1633 1634 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr, 1635 void *data) 1636 { 1637 struct nfs_pgio_res *result = data; 1638 unsigned int pos; 1639 enum nfs_stat status; 1640 int error; 1641 1642 pos = xdr_stream_pos(xdr); 1643 error = decode_nfsstat3(xdr, &status); 1644 if (unlikely(error)) 1645 goto out; 1646 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req)); 1647 if (unlikely(error)) 1648 goto out; 1649 result->op_status = status; 1650 if (status != NFS3_OK) 1651 goto out_status; 1652 result->replen = 4 + ((xdr_stream_pos(xdr) - pos) >> 2); 1653 error = decode_read3resok(xdr, result); 1654 out: 1655 return error; 1656 out_status: 1657 return nfs3_stat_to_errno(status); 1658 } 1659 1660 /* 1661 * 3.3.7 WRITE3res 1662 * 1663 * enum stable_how { 1664 * UNSTABLE = 0, 1665 * DATA_SYNC = 1, 1666 * FILE_SYNC = 2 1667 * }; 1668 * 1669 * struct WRITE3resok { 1670 * wcc_data file_wcc; 1671 * count3 count; 1672 * stable_how committed; 1673 * writeverf3 verf; 1674 * }; 1675 * 1676 * struct WRITE3resfail { 1677 * wcc_data file_wcc; 1678 * }; 1679 * 1680 * union WRITE3res switch (nfsstat3 status) { 1681 * case NFS3_OK: 1682 * WRITE3resok resok; 1683 * default: 1684 * WRITE3resfail resfail; 1685 * }; 1686 */ 1687 static int decode_write3resok(struct xdr_stream *xdr, 1688 struct nfs_pgio_res *result) 1689 { 1690 __be32 *p; 1691 1692 p = xdr_inline_decode(xdr, 4 + 4); 1693 if (unlikely(!p)) 1694 return -EIO; 1695 result->count = be32_to_cpup(p++); 1696 result->verf->committed = be32_to_cpup(p++); 1697 if (unlikely(result->verf->committed > NFS_FILE_SYNC)) 1698 goto out_badvalue; 1699 if (decode_writeverf3(xdr, &result->verf->verifier)) 1700 return -EIO; 1701 return result->count; 1702 out_badvalue: 1703 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed); 1704 return -EIO; 1705 } 1706 1707 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr, 1708 void *data) 1709 { 1710 struct nfs_pgio_res *result = data; 1711 enum nfs_stat status; 1712 int error; 1713 1714 error = decode_nfsstat3(xdr, &status); 1715 if (unlikely(error)) 1716 goto out; 1717 error = decode_wcc_data(xdr, result->fattr, rpc_rqst_userns(req)); 1718 if (unlikely(error)) 1719 goto out; 1720 result->op_status = status; 1721 if (status != NFS3_OK) 1722 goto out_status; 1723 error = decode_write3resok(xdr, result); 1724 out: 1725 return error; 1726 out_status: 1727 return nfs3_stat_to_errno(status); 1728 } 1729 1730 /* 1731 * 3.3.8 CREATE3res 1732 * 1733 * struct CREATE3resok { 1734 * post_op_fh3 obj; 1735 * post_op_attr obj_attributes; 1736 * wcc_data dir_wcc; 1737 * }; 1738 * 1739 * struct CREATE3resfail { 1740 * wcc_data dir_wcc; 1741 * }; 1742 * 1743 * union CREATE3res switch (nfsstat3 status) { 1744 * case NFS3_OK: 1745 * CREATE3resok resok; 1746 * default: 1747 * CREATE3resfail resfail; 1748 * }; 1749 */ 1750 static int decode_create3resok(struct xdr_stream *xdr, 1751 struct nfs3_diropres *result, 1752 struct user_namespace *userns) 1753 { 1754 int error; 1755 1756 error = decode_post_op_fh3(xdr, result->fh); 1757 if (unlikely(error)) 1758 goto out; 1759 error = decode_post_op_attr(xdr, result->fattr, userns); 1760 if (unlikely(error)) 1761 goto out; 1762 /* The server isn't required to return a file handle. 1763 * If it didn't, force the client to perform a LOOKUP 1764 * to determine the correct file handle and attribute 1765 * values for the new object. */ 1766 if (result->fh->size == 0) 1767 result->fattr->valid = 0; 1768 error = decode_wcc_data(xdr, result->dir_attr, userns); 1769 out: 1770 return error; 1771 } 1772 1773 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req, 1774 struct xdr_stream *xdr, 1775 void *data) 1776 { 1777 struct user_namespace *userns = rpc_rqst_userns(req); 1778 struct nfs3_diropres *result = data; 1779 enum nfs_stat status; 1780 int error; 1781 1782 error = decode_nfsstat3(xdr, &status); 1783 if (unlikely(error)) 1784 goto out; 1785 if (status != NFS3_OK) 1786 goto out_default; 1787 error = decode_create3resok(xdr, result, userns); 1788 out: 1789 return error; 1790 out_default: 1791 error = decode_wcc_data(xdr, result->dir_attr, userns); 1792 if (unlikely(error)) 1793 goto out; 1794 return nfs3_stat_to_errno(status); 1795 } 1796 1797 /* 1798 * 3.3.12 REMOVE3res 1799 * 1800 * struct REMOVE3resok { 1801 * wcc_data dir_wcc; 1802 * }; 1803 * 1804 * struct REMOVE3resfail { 1805 * wcc_data dir_wcc; 1806 * }; 1807 * 1808 * union REMOVE3res switch (nfsstat3 status) { 1809 * case NFS3_OK: 1810 * REMOVE3resok resok; 1811 * default: 1812 * REMOVE3resfail resfail; 1813 * }; 1814 */ 1815 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req, 1816 struct xdr_stream *xdr, 1817 void *data) 1818 { 1819 struct nfs_removeres *result = data; 1820 enum nfs_stat status; 1821 int error; 1822 1823 error = decode_nfsstat3(xdr, &status); 1824 if (unlikely(error)) 1825 goto out; 1826 error = decode_wcc_data(xdr, result->dir_attr, rpc_rqst_userns(req)); 1827 if (unlikely(error)) 1828 goto out; 1829 if (status != NFS3_OK) 1830 goto out_status; 1831 out: 1832 return error; 1833 out_status: 1834 return nfs3_stat_to_errno(status); 1835 } 1836 1837 /* 1838 * 3.3.14 RENAME3res 1839 * 1840 * struct RENAME3resok { 1841 * wcc_data fromdir_wcc; 1842 * wcc_data todir_wcc; 1843 * }; 1844 * 1845 * struct RENAME3resfail { 1846 * wcc_data fromdir_wcc; 1847 * wcc_data todir_wcc; 1848 * }; 1849 * 1850 * union RENAME3res switch (nfsstat3 status) { 1851 * case NFS3_OK: 1852 * RENAME3resok resok; 1853 * default: 1854 * RENAME3resfail resfail; 1855 * }; 1856 */ 1857 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req, 1858 struct xdr_stream *xdr, 1859 void *data) 1860 { 1861 struct user_namespace *userns = rpc_rqst_userns(req); 1862 struct nfs_renameres *result = data; 1863 enum nfs_stat status; 1864 int error; 1865 1866 error = decode_nfsstat3(xdr, &status); 1867 if (unlikely(error)) 1868 goto out; 1869 error = decode_wcc_data(xdr, result->old_fattr, userns); 1870 if (unlikely(error)) 1871 goto out; 1872 error = decode_wcc_data(xdr, result->new_fattr, userns); 1873 if (unlikely(error)) 1874 goto out; 1875 if (status != NFS3_OK) 1876 goto out_status; 1877 out: 1878 return error; 1879 out_status: 1880 return nfs3_stat_to_errno(status); 1881 } 1882 1883 /* 1884 * 3.3.15 LINK3res 1885 * 1886 * struct LINK3resok { 1887 * post_op_attr file_attributes; 1888 * wcc_data linkdir_wcc; 1889 * }; 1890 * 1891 * struct LINK3resfail { 1892 * post_op_attr file_attributes; 1893 * wcc_data linkdir_wcc; 1894 * }; 1895 * 1896 * union LINK3res switch (nfsstat3 status) { 1897 * case NFS3_OK: 1898 * LINK3resok resok; 1899 * default: 1900 * LINK3resfail resfail; 1901 * }; 1902 */ 1903 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr, 1904 void *data) 1905 { 1906 struct user_namespace *userns = rpc_rqst_userns(req); 1907 struct nfs3_linkres *result = data; 1908 enum nfs_stat status; 1909 int error; 1910 1911 error = decode_nfsstat3(xdr, &status); 1912 if (unlikely(error)) 1913 goto out; 1914 error = decode_post_op_attr(xdr, result->fattr, userns); 1915 if (unlikely(error)) 1916 goto out; 1917 error = decode_wcc_data(xdr, result->dir_attr, userns); 1918 if (unlikely(error)) 1919 goto out; 1920 if (status != NFS3_OK) 1921 goto out_status; 1922 out: 1923 return error; 1924 out_status: 1925 return nfs3_stat_to_errno(status); 1926 } 1927 1928 /** 1929 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in 1930 * the local page cache 1931 * @xdr: XDR stream where entry resides 1932 * @entry: buffer to fill in with entry data 1933 * @plus: boolean indicating whether this should be a readdirplus entry 1934 * 1935 * Returns zero if successful, otherwise a negative errno value is 1936 * returned. 1937 * 1938 * This function is not invoked during READDIR reply decoding, but 1939 * rather whenever an application invokes the getdents(2) system call 1940 * on a directory already in our cache. 1941 * 1942 * 3.3.16 entry3 1943 * 1944 * struct entry3 { 1945 * fileid3 fileid; 1946 * filename3 name; 1947 * cookie3 cookie; 1948 * fhandle3 filehandle; 1949 * post_op_attr3 attributes; 1950 * entry3 *nextentry; 1951 * }; 1952 * 1953 * 3.3.17 entryplus3 1954 * struct entryplus3 { 1955 * fileid3 fileid; 1956 * filename3 name; 1957 * cookie3 cookie; 1958 * post_op_attr name_attributes; 1959 * post_op_fh3 name_handle; 1960 * entryplus3 *nextentry; 1961 * }; 1962 */ 1963 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry, 1964 bool plus) 1965 { 1966 struct user_namespace *userns = rpc_userns(entry->server->client); 1967 struct nfs_entry old = *entry; 1968 __be32 *p; 1969 int error; 1970 u64 new_cookie; 1971 1972 p = xdr_inline_decode(xdr, 4); 1973 if (unlikely(!p)) 1974 return -EAGAIN; 1975 if (*p == xdr_zero) { 1976 p = xdr_inline_decode(xdr, 4); 1977 if (unlikely(!p)) 1978 return -EAGAIN; 1979 if (*p == xdr_zero) 1980 return -EAGAIN; 1981 entry->eof = 1; 1982 return -EBADCOOKIE; 1983 } 1984 1985 error = decode_fileid3(xdr, &entry->ino); 1986 if (unlikely(error)) 1987 return error; 1988 1989 error = decode_inline_filename3(xdr, &entry->name, &entry->len); 1990 if (unlikely(error)) 1991 return error; 1992 1993 error = decode_cookie3(xdr, &new_cookie); 1994 if (unlikely(error)) 1995 return error; 1996 1997 entry->d_type = DT_UNKNOWN; 1998 1999 if (plus) { 2000 entry->fattr->valid = 0; 2001 error = decode_post_op_attr(xdr, entry->fattr, userns); 2002 if (unlikely(error)) 2003 return error; 2004 if (entry->fattr->valid & NFS_ATTR_FATTR_V3) 2005 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode); 2006 2007 if (entry->fattr->fileid != entry->ino) { 2008 entry->fattr->mounted_on_fileid = entry->ino; 2009 entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID; 2010 } 2011 2012 /* In fact, a post_op_fh3: */ 2013 p = xdr_inline_decode(xdr, 4); 2014 if (unlikely(!p)) 2015 return -EAGAIN; 2016 if (*p != xdr_zero) { 2017 error = decode_nfs_fh3(xdr, entry->fh); 2018 if (unlikely(error)) { 2019 if (error == -E2BIG) 2020 goto out_truncated; 2021 return error; 2022 } 2023 } else 2024 zero_nfs_fh3(entry->fh); 2025 } 2026 2027 entry->prev_cookie = entry->cookie; 2028 entry->cookie = new_cookie; 2029 2030 return 0; 2031 2032 out_truncated: 2033 dprintk("NFS: directory entry contains invalid file handle\n"); 2034 *entry = old; 2035 return -EAGAIN; 2036 } 2037 2038 /* 2039 * 3.3.16 READDIR3res 2040 * 2041 * struct dirlist3 { 2042 * entry3 *entries; 2043 * bool eof; 2044 * }; 2045 * 2046 * struct READDIR3resok { 2047 * post_op_attr dir_attributes; 2048 * cookieverf3 cookieverf; 2049 * dirlist3 reply; 2050 * }; 2051 * 2052 * struct READDIR3resfail { 2053 * post_op_attr dir_attributes; 2054 * }; 2055 * 2056 * union READDIR3res switch (nfsstat3 status) { 2057 * case NFS3_OK: 2058 * READDIR3resok resok; 2059 * default: 2060 * READDIR3resfail resfail; 2061 * }; 2062 * 2063 * Read the directory contents into the page cache, but otherwise 2064 * don't touch them. The actual decoding is done by nfs3_decode_entry() 2065 * during subsequent nfs_readdir() calls. 2066 */ 2067 static int decode_dirlist3(struct xdr_stream *xdr) 2068 { 2069 return xdr_read_pages(xdr, xdr->buf->page_len); 2070 } 2071 2072 static int decode_readdir3resok(struct xdr_stream *xdr, 2073 struct nfs3_readdirres *result, 2074 struct user_namespace *userns) 2075 { 2076 int error; 2077 2078 error = decode_post_op_attr(xdr, result->dir_attr, userns); 2079 if (unlikely(error)) 2080 goto out; 2081 /* XXX: do we need to check if result->verf != NULL ? */ 2082 error = decode_cookieverf3(xdr, result->verf); 2083 if (unlikely(error)) 2084 goto out; 2085 error = decode_dirlist3(xdr); 2086 out: 2087 return error; 2088 } 2089 2090 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req, 2091 struct xdr_stream *xdr, 2092 void *data) 2093 { 2094 struct nfs3_readdirres *result = data; 2095 enum nfs_stat status; 2096 int error; 2097 2098 error = decode_nfsstat3(xdr, &status); 2099 if (unlikely(error)) 2100 goto out; 2101 if (status != NFS3_OK) 2102 goto out_default; 2103 error = decode_readdir3resok(xdr, result, rpc_rqst_userns(req)); 2104 out: 2105 return error; 2106 out_default: 2107 error = decode_post_op_attr(xdr, result->dir_attr, rpc_rqst_userns(req)); 2108 if (unlikely(error)) 2109 goto out; 2110 return nfs3_stat_to_errno(status); 2111 } 2112 2113 /* 2114 * 3.3.18 FSSTAT3res 2115 * 2116 * struct FSSTAT3resok { 2117 * post_op_attr obj_attributes; 2118 * size3 tbytes; 2119 * size3 fbytes; 2120 * size3 abytes; 2121 * size3 tfiles; 2122 * size3 ffiles; 2123 * size3 afiles; 2124 * uint32 invarsec; 2125 * }; 2126 * 2127 * struct FSSTAT3resfail { 2128 * post_op_attr obj_attributes; 2129 * }; 2130 * 2131 * union FSSTAT3res switch (nfsstat3 status) { 2132 * case NFS3_OK: 2133 * FSSTAT3resok resok; 2134 * default: 2135 * FSSTAT3resfail resfail; 2136 * }; 2137 */ 2138 static int decode_fsstat3resok(struct xdr_stream *xdr, 2139 struct nfs_fsstat *result) 2140 { 2141 __be32 *p; 2142 2143 p = xdr_inline_decode(xdr, 8 * 6 + 4); 2144 if (unlikely(!p)) 2145 return -EIO; 2146 p = xdr_decode_size3(p, &result->tbytes); 2147 p = xdr_decode_size3(p, &result->fbytes); 2148 p = xdr_decode_size3(p, &result->abytes); 2149 p = xdr_decode_size3(p, &result->tfiles); 2150 p = xdr_decode_size3(p, &result->ffiles); 2151 xdr_decode_size3(p, &result->afiles); 2152 /* ignore invarsec */ 2153 return 0; 2154 } 2155 2156 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req, 2157 struct xdr_stream *xdr, 2158 void *data) 2159 { 2160 struct nfs_fsstat *result = data; 2161 enum nfs_stat status; 2162 int error; 2163 2164 error = decode_nfsstat3(xdr, &status); 2165 if (unlikely(error)) 2166 goto out; 2167 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req)); 2168 if (unlikely(error)) 2169 goto out; 2170 if (status != NFS3_OK) 2171 goto out_status; 2172 error = decode_fsstat3resok(xdr, result); 2173 out: 2174 return error; 2175 out_status: 2176 return nfs3_stat_to_errno(status); 2177 } 2178 2179 /* 2180 * 3.3.19 FSINFO3res 2181 * 2182 * struct FSINFO3resok { 2183 * post_op_attr obj_attributes; 2184 * uint32 rtmax; 2185 * uint32 rtpref; 2186 * uint32 rtmult; 2187 * uint32 wtmax; 2188 * uint32 wtpref; 2189 * uint32 wtmult; 2190 * uint32 dtpref; 2191 * size3 maxfilesize; 2192 * nfstime3 time_delta; 2193 * uint32 properties; 2194 * }; 2195 * 2196 * struct FSINFO3resfail { 2197 * post_op_attr obj_attributes; 2198 * }; 2199 * 2200 * union FSINFO3res switch (nfsstat3 status) { 2201 * case NFS3_OK: 2202 * FSINFO3resok resok; 2203 * default: 2204 * FSINFO3resfail resfail; 2205 * }; 2206 */ 2207 static int decode_fsinfo3resok(struct xdr_stream *xdr, 2208 struct nfs_fsinfo *result) 2209 { 2210 __be32 *p; 2211 2212 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4); 2213 if (unlikely(!p)) 2214 return -EIO; 2215 result->rtmax = be32_to_cpup(p++); 2216 result->rtpref = be32_to_cpup(p++); 2217 result->rtmult = be32_to_cpup(p++); 2218 result->wtmax = be32_to_cpup(p++); 2219 result->wtpref = be32_to_cpup(p++); 2220 result->wtmult = be32_to_cpup(p++); 2221 result->dtpref = be32_to_cpup(p++); 2222 p = xdr_decode_size3(p, &result->maxfilesize); 2223 xdr_decode_nfstime3(p, &result->time_delta); 2224 2225 /* ignore properties */ 2226 result->lease_time = 0; 2227 return 0; 2228 } 2229 2230 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req, 2231 struct xdr_stream *xdr, 2232 void *data) 2233 { 2234 struct nfs_fsinfo *result = data; 2235 enum nfs_stat status; 2236 int error; 2237 2238 error = decode_nfsstat3(xdr, &status); 2239 if (unlikely(error)) 2240 goto out; 2241 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req)); 2242 if (unlikely(error)) 2243 goto out; 2244 if (status != NFS3_OK) 2245 goto out_status; 2246 error = decode_fsinfo3resok(xdr, result); 2247 out: 2248 return error; 2249 out_status: 2250 return nfs3_stat_to_errno(status); 2251 } 2252 2253 /* 2254 * 3.3.20 PATHCONF3res 2255 * 2256 * struct PATHCONF3resok { 2257 * post_op_attr obj_attributes; 2258 * uint32 linkmax; 2259 * uint32 name_max; 2260 * bool no_trunc; 2261 * bool chown_restricted; 2262 * bool case_insensitive; 2263 * bool case_preserving; 2264 * }; 2265 * 2266 * struct PATHCONF3resfail { 2267 * post_op_attr obj_attributes; 2268 * }; 2269 * 2270 * union PATHCONF3res switch (nfsstat3 status) { 2271 * case NFS3_OK: 2272 * PATHCONF3resok resok; 2273 * default: 2274 * PATHCONF3resfail resfail; 2275 * }; 2276 */ 2277 static int decode_pathconf3resok(struct xdr_stream *xdr, 2278 struct nfs_pathconf *result) 2279 { 2280 __be32 *p; 2281 2282 p = xdr_inline_decode(xdr, 4 * 6); 2283 if (unlikely(!p)) 2284 return -EIO; 2285 result->max_link = be32_to_cpup(p++); 2286 result->max_namelen = be32_to_cpup(p); 2287 /* ignore remaining fields */ 2288 return 0; 2289 } 2290 2291 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req, 2292 struct xdr_stream *xdr, 2293 void *data) 2294 { 2295 struct nfs_pathconf *result = data; 2296 enum nfs_stat status; 2297 int error; 2298 2299 error = decode_nfsstat3(xdr, &status); 2300 if (unlikely(error)) 2301 goto out; 2302 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req)); 2303 if (unlikely(error)) 2304 goto out; 2305 if (status != NFS3_OK) 2306 goto out_status; 2307 error = decode_pathconf3resok(xdr, result); 2308 out: 2309 return error; 2310 out_status: 2311 return nfs3_stat_to_errno(status); 2312 } 2313 2314 /* 2315 * 3.3.21 COMMIT3res 2316 * 2317 * struct COMMIT3resok { 2318 * wcc_data file_wcc; 2319 * writeverf3 verf; 2320 * }; 2321 * 2322 * struct COMMIT3resfail { 2323 * wcc_data file_wcc; 2324 * }; 2325 * 2326 * union COMMIT3res switch (nfsstat3 status) { 2327 * case NFS3_OK: 2328 * COMMIT3resok resok; 2329 * default: 2330 * COMMIT3resfail resfail; 2331 * }; 2332 */ 2333 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req, 2334 struct xdr_stream *xdr, 2335 void *data) 2336 { 2337 struct nfs_commitres *result = data; 2338 struct nfs_writeverf *verf = result->verf; 2339 enum nfs_stat status; 2340 int error; 2341 2342 error = decode_nfsstat3(xdr, &status); 2343 if (unlikely(error)) 2344 goto out; 2345 error = decode_wcc_data(xdr, result->fattr, rpc_rqst_userns(req)); 2346 if (unlikely(error)) 2347 goto out; 2348 result->op_status = status; 2349 if (status != NFS3_OK) 2350 goto out_status; 2351 error = decode_writeverf3(xdr, &verf->verifier); 2352 if (!error) 2353 verf->committed = NFS_FILE_SYNC; 2354 out: 2355 return error; 2356 out_status: 2357 return nfs3_stat_to_errno(status); 2358 } 2359 2360 #ifdef CONFIG_NFS_V3_ACL 2361 2362 static inline int decode_getacl3resok(struct xdr_stream *xdr, 2363 struct nfs3_getaclres *result, 2364 struct user_namespace *userns) 2365 { 2366 struct posix_acl **acl; 2367 unsigned int *aclcnt; 2368 size_t hdrlen; 2369 int error; 2370 2371 error = decode_post_op_attr(xdr, result->fattr, userns); 2372 if (unlikely(error)) 2373 goto out; 2374 error = decode_uint32(xdr, &result->mask); 2375 if (unlikely(error)) 2376 goto out; 2377 error = -EINVAL; 2378 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT)) 2379 goto out; 2380 2381 hdrlen = xdr_stream_pos(xdr); 2382 2383 acl = NULL; 2384 if (result->mask & NFS_ACL) 2385 acl = &result->acl_access; 2386 aclcnt = NULL; 2387 if (result->mask & NFS_ACLCNT) 2388 aclcnt = &result->acl_access_count; 2389 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl); 2390 if (unlikely(error <= 0)) 2391 goto out; 2392 2393 acl = NULL; 2394 if (result->mask & NFS_DFACL) 2395 acl = &result->acl_default; 2396 aclcnt = NULL; 2397 if (result->mask & NFS_DFACLCNT) 2398 aclcnt = &result->acl_default_count; 2399 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl); 2400 if (unlikely(error <= 0)) 2401 return error; 2402 error = 0; 2403 out: 2404 return error; 2405 } 2406 2407 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req, 2408 struct xdr_stream *xdr, 2409 void *result) 2410 { 2411 enum nfs_stat status; 2412 int error; 2413 2414 error = decode_nfsstat3(xdr, &status); 2415 if (unlikely(error)) 2416 goto out; 2417 if (status != NFS3_OK) 2418 goto out_default; 2419 error = decode_getacl3resok(xdr, result, rpc_rqst_userns(req)); 2420 out: 2421 return error; 2422 out_default: 2423 return nfs3_stat_to_errno(status); 2424 } 2425 2426 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req, 2427 struct xdr_stream *xdr, 2428 void *result) 2429 { 2430 enum nfs_stat status; 2431 int error; 2432 2433 error = decode_nfsstat3(xdr, &status); 2434 if (unlikely(error)) 2435 goto out; 2436 if (status != NFS3_OK) 2437 goto out_default; 2438 error = decode_post_op_attr(xdr, result, rpc_rqst_userns(req)); 2439 out: 2440 return error; 2441 out_default: 2442 return nfs3_stat_to_errno(status); 2443 } 2444 2445 #endif /* CONFIG_NFS_V3_ACL */ 2446 2447 2448 /* 2449 * We need to translate between nfs status return values and 2450 * the local errno values which may not be the same. 2451 */ 2452 static const struct { 2453 int stat; 2454 int errno; 2455 } nfs_errtbl[] = { 2456 { NFS_OK, 0 }, 2457 { NFSERR_PERM, -EPERM }, 2458 { NFSERR_NOENT, -ENOENT }, 2459 { NFSERR_IO, -errno_NFSERR_IO}, 2460 { NFSERR_NXIO, -ENXIO }, 2461 /* { NFSERR_EAGAIN, -EAGAIN }, */ 2462 { NFSERR_ACCES, -EACCES }, 2463 { NFSERR_EXIST, -EEXIST }, 2464 { NFSERR_XDEV, -EXDEV }, 2465 { NFSERR_NODEV, -ENODEV }, 2466 { NFSERR_NOTDIR, -ENOTDIR }, 2467 { NFSERR_ISDIR, -EISDIR }, 2468 { NFSERR_INVAL, -EINVAL }, 2469 { NFSERR_FBIG, -EFBIG }, 2470 { NFSERR_NOSPC, -ENOSPC }, 2471 { NFSERR_ROFS, -EROFS }, 2472 { NFSERR_MLINK, -EMLINK }, 2473 { NFSERR_NAMETOOLONG, -ENAMETOOLONG }, 2474 { NFSERR_NOTEMPTY, -ENOTEMPTY }, 2475 { NFSERR_DQUOT, -EDQUOT }, 2476 { NFSERR_STALE, -ESTALE }, 2477 { NFSERR_REMOTE, -EREMOTE }, 2478 #ifdef EWFLUSH 2479 { NFSERR_WFLUSH, -EWFLUSH }, 2480 #endif 2481 { NFSERR_BADHANDLE, -EBADHANDLE }, 2482 { NFSERR_NOT_SYNC, -ENOTSYNC }, 2483 { NFSERR_BAD_COOKIE, -EBADCOOKIE }, 2484 { NFSERR_NOTSUPP, -ENOTSUPP }, 2485 { NFSERR_TOOSMALL, -ETOOSMALL }, 2486 { NFSERR_SERVERFAULT, -EREMOTEIO }, 2487 { NFSERR_BADTYPE, -EBADTYPE }, 2488 { NFSERR_JUKEBOX, -EJUKEBOX }, 2489 { -1, -EIO } 2490 }; 2491 2492 /** 2493 * nfs3_stat_to_errno - convert an NFS status code to a local errno 2494 * @status: NFS status code to convert 2495 * 2496 * Returns a local errno value, or -EIO if the NFS status code is 2497 * not recognized. This function is used jointly by NFSv2 and NFSv3. 2498 */ 2499 static int nfs3_stat_to_errno(enum nfs_stat status) 2500 { 2501 int i; 2502 2503 for (i = 0; nfs_errtbl[i].stat != -1; i++) { 2504 if (nfs_errtbl[i].stat == (int)status) 2505 return nfs_errtbl[i].errno; 2506 } 2507 dprintk("NFS: Unrecognized nfs status value: %u\n", status); 2508 return nfs_errtbl[i].errno; 2509 } 2510 2511 2512 #define PROC(proc, argtype, restype, timer) \ 2513 [NFS3PROC_##proc] = { \ 2514 .p_proc = NFS3PROC_##proc, \ 2515 .p_encode = nfs3_xdr_enc_##argtype##3args, \ 2516 .p_decode = nfs3_xdr_dec_##restype##3res, \ 2517 .p_arglen = NFS3_##argtype##args_sz, \ 2518 .p_replen = NFS3_##restype##res_sz, \ 2519 .p_timer = timer, \ 2520 .p_statidx = NFS3PROC_##proc, \ 2521 .p_name = #proc, \ 2522 } 2523 2524 const struct rpc_procinfo nfs3_procedures[] = { 2525 PROC(GETATTR, getattr, getattr, 1), 2526 PROC(SETATTR, setattr, setattr, 0), 2527 PROC(LOOKUP, lookup, lookup, 2), 2528 PROC(ACCESS, access, access, 1), 2529 PROC(READLINK, readlink, readlink, 3), 2530 PROC(READ, read, read, 3), 2531 PROC(WRITE, write, write, 4), 2532 PROC(CREATE, create, create, 0), 2533 PROC(MKDIR, mkdir, create, 0), 2534 PROC(SYMLINK, symlink, create, 0), 2535 PROC(MKNOD, mknod, create, 0), 2536 PROC(REMOVE, remove, remove, 0), 2537 PROC(RMDIR, lookup, setattr, 0), 2538 PROC(RENAME, rename, rename, 0), 2539 PROC(LINK, link, link, 0), 2540 PROC(READDIR, readdir, readdir, 3), 2541 PROC(READDIRPLUS, readdirplus, readdir, 3), 2542 PROC(FSSTAT, getattr, fsstat, 0), 2543 PROC(FSINFO, getattr, fsinfo, 0), 2544 PROC(PATHCONF, getattr, pathconf, 0), 2545 PROC(COMMIT, commit, commit, 5), 2546 }; 2547 2548 static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)]; 2549 const struct rpc_version nfs_version3 = { 2550 .number = 3, 2551 .nrprocs = ARRAY_SIZE(nfs3_procedures), 2552 .procs = nfs3_procedures, 2553 .counts = nfs_version3_counts, 2554 }; 2555 2556 #ifdef CONFIG_NFS_V3_ACL 2557 static const struct rpc_procinfo nfs3_acl_procedures[] = { 2558 [ACLPROC3_GETACL] = { 2559 .p_proc = ACLPROC3_GETACL, 2560 .p_encode = nfs3_xdr_enc_getacl3args, 2561 .p_decode = nfs3_xdr_dec_getacl3res, 2562 .p_arglen = ACL3_getaclargs_sz, 2563 .p_replen = ACL3_getaclres_sz, 2564 .p_timer = 1, 2565 .p_name = "GETACL", 2566 }, 2567 [ACLPROC3_SETACL] = { 2568 .p_proc = ACLPROC3_SETACL, 2569 .p_encode = nfs3_xdr_enc_setacl3args, 2570 .p_decode = nfs3_xdr_dec_setacl3res, 2571 .p_arglen = ACL3_setaclargs_sz, 2572 .p_replen = ACL3_setaclres_sz, 2573 .p_timer = 0, 2574 .p_name = "SETACL", 2575 }, 2576 }; 2577 2578 static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)]; 2579 const struct rpc_version nfsacl_version3 = { 2580 .number = 3, 2581 .nrprocs = ARRAY_SIZE(nfs3_acl_procedures), 2582 .procs = nfs3_acl_procedures, 2583 .counts = nfs3_acl_counts, 2584 }; 2585 #endif /* CONFIG_NFS_V3_ACL */ 2586