fs/nfs/nfs3xdr.c

   1 /*
   2  * linux/fs/nfs/nfs3xdr.c
   3  *
   4  * XDR functions to encode/decode NFSv3 RPC arguments and results.
   5  *
   6  * Copyright (C) 1996, 1997 Olaf Kirch
   7  */
   8
   9 #include <linux/param.h>
  10 #include <linux/time.h>
  11 #include <linux/mm.h>
  12 #include <linux/errno.h>
  13 #include <linux/string.h>
  14 #include <linux/in.h>
  15 #include <linux/pagemap.h>
  16 #include <linux/proc_fs.h>
  17 #include <linux/kdev_t.h>
  18 #include <linux/sunrpc/clnt.h>
  19 #include <linux/nfs.h>
  20 #include <linux/nfs3.h>
  21 #include <linux/nfs_fs.h>
  22 #include <linux/nfsacl.h>
  23 #include "internal.h"
  24
  25 #define NFSDBG_FACILITY         NFSDBG_XDR
  26
  27 /* Mapping from NFS error code to "errno" error code. */
  28 #define errno_NFSERR_IO         EIO
  29
  30 /*
  31  * Declare the space requirements for NFS arguments and replies as
  32  * number of 32bit-words
  33  */
  34 #define NFS3_fhandle_sz         (1+16)
  35 #define NFS3_fh_sz              (NFS3_fhandle_sz)       /* shorthand */
  36 #define NFS3_sattr_sz           (15)
  37 #define NFS3_filename_sz        (1+(NFS3_MAXNAMLEN>>2))
  38 #define NFS3_path_sz            (1+(NFS3_MAXPATHLEN>>2))
  39 #define NFS3_fattr_sz           (21)
  40 #define NFS3_cookieverf_sz      (NFS3_COOKIEVERFSIZE>>2)
  41 #define NFS3_wcc_attr_sz        (6)
  42 #define NFS3_pre_op_attr_sz     (1+NFS3_wcc_attr_sz)
  43 #define NFS3_post_op_attr_sz    (1+NFS3_fattr_sz)
  44 #define NFS3_wcc_data_sz        (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
  45 #define NFS3_diropargs_sz       (NFS3_fh_sz+NFS3_filename_sz)
  46
  47 #define NFS3_getattrargs_sz     (NFS3_fh_sz)
  48 #define NFS3_setattrargs_sz     (NFS3_fh_sz+NFS3_sattr_sz+3)
  49 #define NFS3_lookupargs_sz      (NFS3_fh_sz+NFS3_filename_sz)
  50 #define NFS3_accessargs_sz      (NFS3_fh_sz+1)
  51 #define NFS3_readlinkargs_sz    (NFS3_fh_sz)
  52 #define NFS3_readargs_sz        (NFS3_fh_sz+3)
  53 #define NFS3_writeargs_sz       (NFS3_fh_sz+5)
  54 #define NFS3_createargs_sz      (NFS3_diropargs_sz+NFS3_sattr_sz)
  55 #define NFS3_mkdirargs_sz       (NFS3_diropargs_sz+NFS3_sattr_sz)
  56 #define NFS3_symlinkargs_sz     (NFS3_diropargs_sz+1+NFS3_sattr_sz)
  57 #define NFS3_mknodargs_sz       (NFS3_diropargs_sz+2+NFS3_sattr_sz)
  58 #define NFS3_removeargs_sz      (NFS3_fh_sz+NFS3_filename_sz)
  59 #define NFS3_renameargs_sz      (NFS3_diropargs_sz+NFS3_diropargs_sz)
  60 #define NFS3_linkargs_sz                (NFS3_fh_sz+NFS3_diropargs_sz)
  61 #define NFS3_readdirargs_sz     (NFS3_fh_sz+NFS3_cookieverf_sz+3)
  62 #define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
  63 #define NFS3_commitargs_sz      (NFS3_fh_sz+3)
  64
  65 #define NFS3_getattrres_sz      (1+NFS3_fattr_sz)
  66 #define NFS3_setattrres_sz      (1+NFS3_wcc_data_sz)
  67 #define NFS3_removeres_sz       (NFS3_setattrres_sz)
  68 #define NFS3_lookupres_sz       (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
  69 #define NFS3_accessres_sz       (1+NFS3_post_op_attr_sz+1)
  70 #define NFS3_readlinkres_sz     (1+NFS3_post_op_attr_sz+1)
  71 #define NFS3_readres_sz         (1+NFS3_post_op_attr_sz+3)
  72 #define NFS3_writeres_sz        (1+NFS3_wcc_data_sz+4)
  73 #define NFS3_createres_sz       (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
  74 #define NFS3_renameres_sz       (1+(2 * NFS3_wcc_data_sz))
  75 #define NFS3_linkres_sz         (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
  76 #define NFS3_readdirres_sz      (1+NFS3_post_op_attr_sz+2)
  77 #define NFS3_fsstatres_sz       (1+NFS3_post_op_attr_sz+13)
  78 #define NFS3_fsinfores_sz       (1+NFS3_post_op_attr_sz+12)
  79 #define NFS3_pathconfres_sz     (1+NFS3_post_op_attr_sz+6)
  80 #define NFS3_commitres_sz       (1+NFS3_wcc_data_sz+2)
  81
  82 #define ACL3_getaclargs_sz      (NFS3_fh_sz+1)
  83 #define ACL3_setaclargs_sz      (NFS3_fh_sz+1+ \
  84                                 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
  85 #define ACL3_getaclres_sz       (1+NFS3_post_op_attr_sz+1+ \
  86                                 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
  87 #define ACL3_setaclres_sz       (1+NFS3_post_op_attr_sz)
  88
  89 /*
  90  * Map file type to S_IFMT bits
  91  */
  92 static const umode_t nfs_type2fmt[] = {
  93         [NF3BAD] = 0,
  94         [NF3REG] = S_IFREG,
  95         [NF3DIR] = S_IFDIR,
  96         [NF3BLK] = S_IFBLK,
  97         [NF3CHR] = S_IFCHR,
  98         [NF3LNK] = S_IFLNK,
  99         [NF3SOCK] = S_IFSOCK,
 100         [NF3FIFO] = S_IFIFO,
 101 };
 102
 103 /*
 104  * While encoding arguments, set up the reply buffer in advance to
 105  * receive reply data directly into the page cache.
 106  */
 107 static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
 108                                  unsigned int base, unsigned int len,
 109                                  unsigned int bufsize)
 110 {
 111         struct rpc_auth *auth = req->rq_cred->cr_auth;
 112         unsigned int replen;
 113
 114         replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
 115         xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
 116 }
 117
 118 /*
 119  * Handle decode buffer overflows out-of-line.
 120  */
 121 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
 122 {
 123         dprintk("NFS: %s prematurely hit the end of our receive buffer. "
 124                 "Remaining buffer length is %tu words.\n",
 125                 func, xdr->end - xdr->p);
 126 }
 127
 128
 129 /*
 130  * Encode/decode NFSv3 basic data types
 131  *
 132  * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
 133  * "NFS Version 3 Protocol Specification".
 134  *
 135  * Not all basic data types have their own encoding and decoding
 136  * functions.  For run-time efficiency, some data types are encoded
 137  * or decoded inline.
 138  */
 139
 140 static void encode_uint32(struct xdr_stream *xdr, u32 value)
 141 {
 142         __be32 *p = xdr_reserve_space(xdr, 4);
 143         *p = cpu_to_be32(value);
 144 }
 145
 146 static int decode_uint32(struct xdr_stream *xdr, u32 *value)
 147 {
 148         __be32 *p;
 149
 150         p = xdr_inline_decode(xdr, 4);
 151         if (unlikely(p == NULL))
 152                 goto out_overflow;
 153         *value = be32_to_cpup(p);
 154         return 0;
 155 out_overflow:
 156         print_overflow_msg(__func__, xdr);
 157         return -EIO;
 158 }
 159
 160 static int decode_uint64(struct xdr_stream *xdr, u64 *value)
 161 {
 162         __be32 *p;
 163
 164         p = xdr_inline_decode(xdr, 8);
 165         if (unlikely(p == NULL))
 166                 goto out_overflow;
 167         xdr_decode_hyper(p, value);
 168         return 0;
 169 out_overflow:
 170         print_overflow_msg(__func__, xdr);
 171         return -EIO;
 172 }
 173
 174 /*
 175  * fileid3
 176  *
 177  *      typedef uint64 fileid3;
 178  */
 179 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
 180 {
 181         return xdr_decode_hyper(p, fileid);
 182 }
 183
 184 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
 185 {
 186         return decode_uint64(xdr, fileid);
 187 }
 188
 189 /*
 190  * filename3
 191  *
 192  *      typedef string filename3<>;
 193  */
 194 static void encode_filename3(struct xdr_stream *xdr,
 195                              const char *name, u32 length)
 196 {
 197         __be32 *p;
 198
 199         BUG_ON(length > NFS3_MAXNAMLEN);
 200         p = xdr_reserve_space(xdr, 4 + length);
 201         xdr_encode_opaque(p, name, length);
 202 }
 203
 204 static int decode_inline_filename3(struct xdr_stream *xdr,
 205                                    const char **name, u32 *length)
 206 {
 207         __be32 *p;
 208         u32 count;
 209
 210         p = xdr_inline_decode(xdr, 4);
 211         if (unlikely(p == NULL))
 212                 goto out_overflow;
 213         count = be32_to_cpup(p);
 214         if (count > NFS3_MAXNAMLEN)
 215                 goto out_nametoolong;
 216         p = xdr_inline_decode(xdr, count);
 217         if (unlikely(p == NULL))
 218                 goto out_overflow;
 219         *name = (const char *)p;
 220         *length = count;
 221         return 0;
 222
 223 out_nametoolong:
 224         dprintk("NFS: returned filename too long: %u\n", count);
 225         return -ENAMETOOLONG;
 226 out_overflow:
 227         print_overflow_msg(__func__, xdr);
 228         return -EIO;
 229 }
 230
 231 /*
 232  * nfspath3
 233  *
 234  *      typedef string nfspath3<>;
 235  */
 236 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
 237                             const u32 length)
 238 {
 239         BUG_ON(length > NFS3_MAXPATHLEN);
 240         encode_uint32(xdr, length);
 241         xdr_write_pages(xdr, pages, 0, length);
 242 }
 243
 244 static int decode_nfspath3(struct xdr_stream *xdr)
 245 {
 246         u32 recvd, count;
 247         size_t hdrlen;
 248         __be32 *p;
 249
 250         p = xdr_inline_decode(xdr, 4);
 251         if (unlikely(p == NULL))
 252                 goto out_overflow;
 253         count = be32_to_cpup(p);
 254         if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
 255                 goto out_nametoolong;
 256         hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
 257         recvd = xdr->buf->len - hdrlen;
 258         if (unlikely(count > recvd))
 259                 goto out_cheating;
 260
 261         xdr_read_pages(xdr, count);
 262         xdr_terminate_string(xdr->buf, count);
 263         return 0;
 264
 265 out_nametoolong:
 266         dprintk("NFS: returned pathname too long: %u\n", count);
 267         return -ENAMETOOLONG;
 268 out_cheating:
 269         dprintk("NFS: server cheating in pathname result: "
 270                 "count %u > recvd %u\n", count, recvd);
 271         return -EIO;
 272 out_overflow:
 273         print_overflow_msg(__func__, xdr);
 274         return -EIO;
 275 }
 276
 277 /*
 278  * cookie3
 279  *
 280  *      typedef uint64 cookie3
 281  */
 282 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
 283 {
 284         return xdr_encode_hyper(p, cookie);
 285 }
 286
 287 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
 288 {
 289         return decode_uint64(xdr, cookie);
 290 }
 291
 292 /*
 293  * cookieverf3
 294  *
 295  *      typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
 296  */
 297 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
 298 {
 299         memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
 300         return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
 301 }
 302
 303 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
 304 {
 305         __be32 *p;
 306
 307         p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
 308         if (unlikely(p == NULL))
 309                 goto out_overflow;
 310         memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
 311         return 0;
 312 out_overflow:
 313         print_overflow_msg(__func__, xdr);
 314         return -EIO;
 315 }
 316
 317 /*
 318  * createverf3
 319  *
 320  *      typedef opaque createverf3[NFS3_CREATEVERFSIZE];
 321  */
 322 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
 323 {
 324         __be32 *p;
 325
 326         p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
 327         memcpy(p, verifier, NFS3_CREATEVERFSIZE);
 328 }
 329
 330 static int decode_writeverf3(struct xdr_stream *xdr, __be32 *verifier)
 331 {
 332         __be32 *p;
 333
 334         p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
 335         if (unlikely(p == NULL))
 336                 goto out_overflow;
 337         memcpy(verifier, p, NFS3_WRITEVERFSIZE);
 338         return 0;
 339 out_overflow:
 340         print_overflow_msg(__func__, xdr);
 341         return -EIO;
 342 }
 343
 344 /*
 345  * size3
 346  *
 347  *      typedef uint64 size3;
 348  */
 349 static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
 350 {
 351         return xdr_decode_hyper(p, size);
 352 }
 353
 354 /*
 355  * nfsstat3
 356  *
 357  *      enum nfsstat3 {
 358  *              NFS3_OK = 0,
 359  *              ...
 360  *      }
 361  */
 362 #define NFS3_OK         NFS_OK
 363
 364 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
 365 {
 366         __be32 *p;
 367
 368         p = xdr_inline_decode(xdr, 4);
 369         if (unlikely(p == NULL))
 370                 goto out_overflow;
 371         *status = be32_to_cpup(p);
 372         return 0;
 373 out_overflow:
 374         print_overflow_msg(__func__, xdr);
 375         return -EIO;
 376 }
 377
 378 /*
 379  * ftype3
 380  *
 381  *      enum ftype3 {
 382  *              NF3REG  = 1,
 383  *              NF3DIR  = 2,
 384  *              NF3BLK  = 3,
 385  *              NF3CHR  = 4,
 386  *              NF3LNK  = 5,
 387  *              NF3SOCK = 6,
 388  *              NF3FIFO = 7
 389  *      };
 390  */
 391 static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
 392 {
 393         BUG_ON(type > NF3FIFO);
 394         encode_uint32(xdr, type);
 395 }
 396
 397 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
 398 {
 399         u32 type;
 400
 401         type = be32_to_cpup(p++);
 402         if (type > NF3FIFO)
 403                 type = NF3NON;
 404         *mode = nfs_type2fmt[type];
 405         return p;
 406 }
 407
 408 /*
 409  * specdata3
 410  *
 411  *     struct specdata3 {
 412  *             uint32  specdata1;
 413  *             uint32  specdata2;
 414  *     };
 415  */
 416 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
 417 {
 418         __be32 *p;
 419
 420         p = xdr_reserve_space(xdr, 8);
 421         *p++ = cpu_to_be32(MAJOR(rdev));
 422         *p = cpu_to_be32(MINOR(rdev));
 423 }
 424
 425 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
 426 {
 427         unsigned int major, minor;
 428
 429         major = be32_to_cpup(p++);
 430         minor = be32_to_cpup(p++);
 431         *rdev = MKDEV(major, minor);
 432         if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
 433                 *rdev = 0;
 434         return p;
 435 }
 436
 437 /*
 438  * nfs_fh3
 439  *
 440  *      struct nfs_fh3 {
 441  *              opaque       data<NFS3_FHSIZE>;
 442  *      };
 443  */
 444 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
 445 {
 446         __be32 *p;
 447
 448         BUG_ON(fh->size > NFS3_FHSIZE);
 449         p = xdr_reserve_space(xdr, 4 + fh->size);
 450         xdr_encode_opaque(p, fh->data, fh->size);
 451 }
 452
 453 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
 454 {
 455         u32 length;
 456         __be32 *p;
 457
 458         p = xdr_inline_decode(xdr, 4);
 459         if (unlikely(p == NULL))
 460                 goto out_overflow;
 461         length = be32_to_cpup(p++);
 462         if (unlikely(length > NFS3_FHSIZE))
 463                 goto out_toobig;
 464         p = xdr_inline_decode(xdr, length);
 465         if (unlikely(p == NULL))
 466                 goto out_overflow;
 467         fh->size = length;
 468         memcpy(fh->data, p, length);
 469         return 0;
 470 out_toobig:
 471         dprintk("NFS: file handle size (%u) too big\n", length);
 472         return -E2BIG;
 473 out_overflow:
 474         print_overflow_msg(__func__, xdr);
 475         return -EIO;
 476 }
 477
 478 static void zero_nfs_fh3(struct nfs_fh *fh)
 479 {
 480         memset(fh, 0, sizeof(*fh));
 481 }
 482
 483 /*
 484  * nfstime3
 485  *
 486  *      struct nfstime3 {
 487  *              uint32  seconds;
 488  *              uint32  nseconds;
 489  *      };
 490  */
 491 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
 492 {
 493         *p++ = cpu_to_be32(timep->tv_sec);
 494         *p++ = cpu_to_be32(timep->tv_nsec);
 495         return p;
 496 }
 497
 498 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
 499 {
 500         timep->tv_sec = be32_to_cpup(p++);
 501         timep->tv_nsec = be32_to_cpup(p++);
 502         return p;
 503 }
 504
 505 /*
 506  * sattr3
 507  *
 508  *      enum time_how {
 509  *              DONT_CHANGE             = 0,
 510  *              SET_TO_SERVER_TIME      = 1,
 511  *              SET_TO_CLIENT_TIME      = 2
 512  *      };
 513  *
 514  *      union set_mode3 switch (bool set_it) {
 515  *      case TRUE:
 516  *              mode3   mode;
 517  *      default:
 518  *              void;
 519  *      };
 520  *
 521  *      union set_uid3 switch (bool set_it) {
 522  *      case TRUE:
 523  *              uid3    uid;
 524  *      default:
 525  *              void;
 526  *      };
 527  *
 528  *      union set_gid3 switch (bool set_it) {
 529  *      case TRUE:
 530  *              gid3    gid;
 531  *      default:
 532  *              void;
 533  *      };
 534  *
 535  *      union set_size3 switch (bool set_it) {
 536  *      case TRUE:
 537  *              size3   size;
 538  *      default:
 539  *              void;
 540  *      };
 541  *
 542  *      union set_atime switch (time_how set_it) {
 543  *      case SET_TO_CLIENT_TIME:
 544  *              nfstime3        atime;
 545  *      default:
 546  *              void;
 547  *      };
 548  *
 549  *      union set_mtime switch (time_how set_it) {
 550  *      case SET_TO_CLIENT_TIME:
 551  *              nfstime3  mtime;
 552  *      default:
 553  *              void;
 554  *      };
 555  *
 556  *      struct sattr3 {
 557  *              set_mode3       mode;
 558  *              set_uid3        uid;
 559  *              set_gid3        gid;
 560  *              set_size3       size;
 561  *              set_atime       atime;
 562  *              set_mtime       mtime;
 563  *      };
 564  */
 565 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
 566 {
 567         u32 nbytes;
 568         __be32 *p;
 569
 570         /*
 571          * In order to make only a single xdr_reserve_space() call,
 572          * pre-compute the total number of bytes to be reserved.
 573          * Six boolean values, one for each set_foo field, are always
 574          * present in the encoded result, so start there.
 575          */
 576         nbytes = 6 * 4;
 577         if (attr->ia_valid & ATTR_MODE)
 578                 nbytes += 4;
 579         if (attr->ia_valid & ATTR_UID)
 580                 nbytes += 4;
 581         if (attr->ia_valid & ATTR_GID)
 582                 nbytes += 4;
 583         if (attr->ia_valid & ATTR_SIZE)
 584                 nbytes += 8;
 585         if (attr->ia_valid & ATTR_ATIME_SET)
 586                 nbytes += 8;
 587         if (attr->ia_valid & ATTR_MTIME_SET)
 588                 nbytes += 8;
 589         p = xdr_reserve_space(xdr, nbytes);
 590
 591         if (attr->ia_valid & ATTR_MODE) {
 592                 *p++ = xdr_one;
 593                 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
 594         } else
 595                 *p++ = xdr_zero;
 596
 597         if (attr->ia_valid & ATTR_UID) {
 598                 *p++ = xdr_one;
 599                 *p++ = cpu_to_be32(attr->ia_uid);
 600         } else
 601                 *p++ = xdr_zero;
 602
 603         if (attr->ia_valid & ATTR_GID) {
 604                 *p++ = xdr_one;
 605                 *p++ = cpu_to_be32(attr->ia_gid);
 606         } else
 607                 *p++ = xdr_zero;
 608
 609         if (attr->ia_valid & ATTR_SIZE) {
 610                 *p++ = xdr_one;
 611                 p = xdr_encode_hyper(p, (u64)attr->ia_size);
 612         } else
 613                 *p++ = xdr_zero;
 614
 615         if (attr->ia_valid & ATTR_ATIME_SET) {
 616                 *p++ = xdr_two;
 617                 p = xdr_encode_nfstime3(p, &attr->ia_atime);
 618         } else if (attr->ia_valid & ATTR_ATIME) {
 619                 *p++ = xdr_one;
 620         } else
 621                 *p++ = xdr_zero;
 622
 623         if (attr->ia_valid & ATTR_MTIME_SET) {
 624                 *p++ = xdr_two;
 625                 xdr_encode_nfstime3(p, &attr->ia_mtime);
 626         } else if (attr->ia_valid & ATTR_MTIME) {
 627                 *p = xdr_one;
 628         } else
 629                 *p = xdr_zero;
 630 }
 631
 632 /*
 633  * fattr3
 634  *
 635  *      struct fattr3 {
 636  *              ftype3          type;
 637  *              mode3           mode;
 638  *              uint32          nlink;
 639  *              uid3            uid;
 640  *              gid3            gid;
 641  *              size3           size;
 642  *              size3           used;
 643  *              specdata3       rdev;
 644  *              uint64          fsid;
 645  *              fileid3         fileid;
 646  *              nfstime3        atime;
 647  *              nfstime3        mtime;
 648  *              nfstime3        ctime;
 649  *      };
 650  */
 651 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 652 {
 653         umode_t fmode;
 654         __be32 *p;
 655
 656         p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
 657         if (unlikely(p == NULL))
 658                 goto out_overflow;
 659
 660         p = xdr_decode_ftype3(p, &fmode);
 661
 662         fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
 663         fattr->nlink = be32_to_cpup(p++);
 664         fattr->uid = be32_to_cpup(p++);
 665         fattr->gid = be32_to_cpup(p++);
 666
 667         p = xdr_decode_size3(p, &fattr->size);
 668         p = xdr_decode_size3(p, &fattr->du.nfs3.used);
 669         p = xdr_decode_specdata3(p, &fattr->rdev);
 670
 671         p = xdr_decode_hyper(p, &fattr->fsid.major);
 672         fattr->fsid.minor = 0;
 673
 674         p = xdr_decode_fileid3(p, &fattr->fileid);
 675         p = xdr_decode_nfstime3(p, &fattr->atime);
 676         p = xdr_decode_nfstime3(p, &fattr->mtime);
 677         xdr_decode_nfstime3(p, &fattr->ctime);
 678
 679         fattr->valid |= NFS_ATTR_FATTR_V3;
 680         return 0;
 681 out_overflow:
 682         print_overflow_msg(__func__, xdr);
 683         return -EIO;
 684 }
 685
 686 /*
 687  * post_op_attr
 688  *
 689  *      union post_op_attr switch (bool attributes_follow) {
 690  *      case TRUE:
 691  *              fattr3  attributes;
 692  *      case FALSE:
 693  *              void;
 694  *      };
 695  */
 696 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 697 {
 698         __be32 *p;
 699
 700         p = xdr_inline_decode(xdr, 4);
 701         if (unlikely(p == NULL))
 702                 goto out_overflow;
 703         if (*p != xdr_zero)
 704                 return decode_fattr3(xdr, fattr);
 705         return 0;
 706 out_overflow:
 707         print_overflow_msg(__func__, xdr);
 708         return -EIO;
 709 }
 710
 711 /*
 712  * wcc_attr
 713  *      struct wcc_attr {
 714  *              size3           size;
 715  *              nfstime3        mtime;
 716  *              nfstime3        ctime;
 717  *      };
 718  */
 719 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 720 {
 721         __be32 *p;
 722
 723         p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
 724         if (unlikely(p == NULL))
 725                 goto out_overflow;
 726
 727         fattr->valid |= NFS_ATTR_FATTR_PRESIZE
 728                 | NFS_ATTR_FATTR_PREMTIME
 729                 | NFS_ATTR_FATTR_PRECTIME;
 730
 731         p = xdr_decode_size3(p, &fattr->pre_size);
 732         p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
 733         xdr_decode_nfstime3(p, &fattr->pre_ctime);
 734
 735         return 0;
 736 out_overflow:
 737         print_overflow_msg(__func__, xdr);
 738         return -EIO;
 739 }
 740
 741 /*
 742  * pre_op_attr
 743  *      union pre_op_attr switch (bool attributes_follow) {
 744  *      case TRUE:
 745  *              wcc_attr        attributes;
 746  *      case FALSE:
 747  *              void;
 748  *      };
 749  *
 750  * wcc_data
 751  *
 752  *      struct wcc_data {
 753  *              pre_op_attr     before;
 754  *              post_op_attr    after;
 755  *      };
 756  */
 757 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 758 {
 759         __be32 *p;
 760
 761         p = xdr_inline_decode(xdr, 4);
 762         if (unlikely(p == NULL))
 763                 goto out_overflow;
 764         if (*p != xdr_zero)
 765                 return decode_wcc_attr(xdr, fattr);
 766         return 0;
 767 out_overflow:
 768         print_overflow_msg(__func__, xdr);
 769         return -EIO;
 770 }
 771
 772 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 773 {
 774         int error;
 775
 776         error = decode_pre_op_attr(xdr, fattr);
 777         if (unlikely(error))
 778                 goto out;
 779         error = decode_post_op_attr(xdr, fattr);
 780 out:
 781         return error;
 782 }
 783
 784 /*
 785  * post_op_fh3
 786  *
 787  *      union post_op_fh3 switch (bool handle_follows) {
 788  *      case TRUE:
 789  *              nfs_fh3  handle;
 790  *      case FALSE:
 791  *              void;
 792  *      };
 793  */
 794 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
 795 {
 796         __be32 *p = xdr_inline_decode(xdr, 4);
 797         if (unlikely(p == NULL))
 798                 goto out_overflow;
 799         if (*p != xdr_zero)
 800                 return decode_nfs_fh3(xdr, fh);
 801         zero_nfs_fh3(fh);
 802         return 0;
 803 out_overflow:
 804         print_overflow_msg(__func__, xdr);
 805         return -EIO;
 806 }
 807
 808 /*
 809  * diropargs3
 810  *
 811  *      struct diropargs3 {
 812  *              nfs_fh3         dir;
 813  *              filename3       name;
 814  *      };
 815  */
 816 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
 817                               const char *name, u32 length)
 818 {
 819         encode_nfs_fh3(xdr, fh);
 820         encode_filename3(xdr, name, length);
 821 }
 822
 823
 824 /*
 825  * NFSv3 XDR encode functions
 826  *
 827  * NFSv3 argument types are defined in section 3.3 of RFC 1813:
 828  * "NFS Version 3 Protocol Specification".
 829  */
 830
 831 /*
 832  * 3.3.1  GETATTR3args
 833  *
 834  *      struct GETATTR3args {
 835  *              nfs_fh3  object;
 836  *      };
 837  */
 838 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
 839                                       struct xdr_stream *xdr,
 840                                       const struct nfs_fh *fh)
 841 {
 842         encode_nfs_fh3(xdr, fh);
 843 }
 844
 845 /*
 846  * 3.3.2  SETATTR3args
 847  *
 848  *      union sattrguard3 switch (bool check) {
 849  *      case TRUE:
 850  *              nfstime3  obj_ctime;
 851  *      case FALSE:
 852  *              void;
 853  *      };
 854  *
 855  *      struct SETATTR3args {
 856  *              nfs_fh3         object;
 857  *              sattr3          new_attributes;
 858  *              sattrguard3     guard;
 859  *      };
 860  */
 861 static void encode_sattrguard3(struct xdr_stream *xdr,
 862                                const struct nfs3_sattrargs *args)
 863 {
 864         __be32 *p;
 865
 866         if (args->guard) {
 867                 p = xdr_reserve_space(xdr, 4 + 8);
 868                 *p++ = xdr_one;
 869                 xdr_encode_nfstime3(p, &args->guardtime);
 870         } else {
 871                 p = xdr_reserve_space(xdr, 4);
 872                 *p = xdr_zero;
 873         }
 874 }
 875
 876 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
 877                                       struct xdr_stream *xdr,
 878                                       const struct nfs3_sattrargs *args)
 879 {
 880         encode_nfs_fh3(xdr, args->fh);
 881         encode_sattr3(xdr, args->sattr);
 882         encode_sattrguard3(xdr, args);
 883 }
 884
 885 /*
 886  * 3.3.3  LOOKUP3args
 887  *
 888  *      struct LOOKUP3args {
 889  *              diropargs3  what;
 890  *      };
 891  */
 892 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
 893                                      struct xdr_stream *xdr,
 894                                      const struct nfs3_diropargs *args)
 895 {
 896         encode_diropargs3(xdr, args->fh, args->name, args->len);
 897 }
 898
 899 /*
 900  * 3.3.4  ACCESS3args
 901  *
 902  *      struct ACCESS3args {
 903  *              nfs_fh3         object;
 904  *              uint32          access;
 905  *      };
 906  */
 907 static void encode_access3args(struct xdr_stream *xdr,
 908                                const struct nfs3_accessargs *args)
 909 {
 910         encode_nfs_fh3(xdr, args->fh);
 911         encode_uint32(xdr, args->access);
 912 }
 913
 914 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
 915                                      struct xdr_stream *xdr,
 916                                      const struct nfs3_accessargs *args)
 917 {
 918         encode_access3args(xdr, args);
 919 }
 920
 921 /*
 922  * 3.3.5  READLINK3args
 923  *
 924  *      struct READLINK3args {
 925  *              nfs_fh3 symlink;
 926  *      };
 927  */
 928 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
 929                                        struct xdr_stream *xdr,
 930                                        const struct nfs3_readlinkargs *args)
 931 {
 932         encode_nfs_fh3(xdr, args->fh);
 933         prepare_reply_buffer(req, args->pages, args->pgbase,
 934                                         args->pglen, NFS3_readlinkres_sz);
 935 }
 936
 937 /*
 938  * 3.3.6  READ3args
 939  *
 940  *      struct READ3args {
 941  *              nfs_fh3         file;
 942  *              offset3         offset;
 943  *              count3          count;
 944  *      };
 945  */
 946 static void encode_read3args(struct xdr_stream *xdr,
 947                              const struct nfs_readargs *args)
 948 {
 949         __be32 *p;
 950
 951         encode_nfs_fh3(xdr, args->fh);
 952
 953         p = xdr_reserve_space(xdr, 8 + 4);
 954         p = xdr_encode_hyper(p, args->offset);
 955         *p = cpu_to_be32(args->count);
 956 }
 957
 958 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
 959                                    struct xdr_stream *xdr,
 960                                    const struct nfs_readargs *args)
 961 {
 962         encode_read3args(xdr, args);
 963         prepare_reply_buffer(req, args->pages, args->pgbase,
 964                                         args->count, NFS3_readres_sz);
 965         req->rq_rcv_buf.flags |= XDRBUF_READ;
 966 }
 967
 968 /*
 969  * 3.3.7  WRITE3args
 970  *
 971  *      enum stable_how {
 972  *              UNSTABLE  = 0,
 973  *              DATA_SYNC = 1,
 974  *              FILE_SYNC = 2
 975  *      };
 976  *
 977  *      struct WRITE3args {
 978  *              nfs_fh3         file;
 979  *              offset3         offset;
 980  *              count3          count;
 981  *              stable_how      stable;
 982  *              opaque          data<>;
 983  *      };
 984  */
 985 static void encode_write3args(struct xdr_stream *xdr,
 986                               const struct nfs_writeargs *args)
 987 {
 988         __be32 *p;
 989
 990         encode_nfs_fh3(xdr, args->fh);
 991
 992         p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
 993         p = xdr_encode_hyper(p, args->offset);
 994         *p++ = cpu_to_be32(args->count);
 995         *p++ = cpu_to_be32(args->stable);
 996         *p = cpu_to_be32(args->count);
 997         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
 998 }
 999
1000 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
1001                                     struct xdr_stream *xdr,
1002                                     const struct nfs_writeargs *args)
1003 {
1004         encode_write3args(xdr, args);
1005         xdr->buf->flags |= XDRBUF_WRITE;
1006 }
1007
1008 /*
1009  * 3.3.8  CREATE3args
1010  *
1011  *      enum createmode3 {
1012  *              UNCHECKED = 0,
1013  *              GUARDED   = 1,
1014  *              EXCLUSIVE = 2
1015  *      };
1016  *
1017  *      union createhow3 switch (createmode3 mode) {
1018  *      case UNCHECKED:
1019  *      case GUARDED:
1020  *              sattr3       obj_attributes;
1021  *      case EXCLUSIVE:
1022  *              createverf3  verf;
1023  *      };
1024  *
1025  *      struct CREATE3args {
1026  *              diropargs3      where;
1027  *              createhow3      how;
1028  *      };
1029  */
1030 static void encode_createhow3(struct xdr_stream *xdr,
1031                               const struct nfs3_createargs *args)
1032 {
1033         encode_uint32(xdr, args->createmode);
1034         switch (args->createmode) {
1035         case NFS3_CREATE_UNCHECKED:
1036         case NFS3_CREATE_GUARDED:
1037                 encode_sattr3(xdr, args->sattr);
1038                 break;
1039         case NFS3_CREATE_EXCLUSIVE:
1040                 encode_createverf3(xdr, args->verifier);
1041                 break;
1042         default:
1043                 BUG();
1044         }
1045 }
1046
1047 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1048                                      struct xdr_stream *xdr,
1049                                      const struct nfs3_createargs *args)
1050 {
1051         encode_diropargs3(xdr, args->fh, args->name, args->len);
1052         encode_createhow3(xdr, args);
1053 }
1054
1055 /*
1056  * 3.3.9  MKDIR3args
1057  *
1058  *      struct MKDIR3args {
1059  *              diropargs3      where;
1060  *              sattr3          attributes;
1061  *      };
1062  */
1063 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1064                                     struct xdr_stream *xdr,
1065                                     const struct nfs3_mkdirargs *args)
1066 {
1067         encode_diropargs3(xdr, args->fh, args->name, args->len);
1068         encode_sattr3(xdr, args->sattr);
1069 }
1070
1071 /*
1072  * 3.3.10  SYMLINK3args
1073  *
1074  *      struct symlinkdata3 {
1075  *              sattr3          symlink_attributes;
1076  *              nfspath3        symlink_data;
1077  *      };
1078  *
1079  *      struct SYMLINK3args {
1080  *              diropargs3      where;
1081  *              symlinkdata3    symlink;
1082  *      };
1083  */
1084 static void encode_symlinkdata3(struct xdr_stream *xdr,
1085                                 const struct nfs3_symlinkargs *args)
1086 {
1087         encode_sattr3(xdr, args->sattr);
1088         encode_nfspath3(xdr, args->pages, args->pathlen);
1089 }
1090
1091 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1092                                       struct xdr_stream *xdr,
1093                                       const struct nfs3_symlinkargs *args)
1094 {
1095         encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1096         encode_symlinkdata3(xdr, args);
1097 }
1098
1099 /*
1100  * 3.3.11  MKNOD3args
1101  *
1102  *      struct devicedata3 {
1103  *              sattr3          dev_attributes;
1104  *              specdata3       spec;
1105  *      };
1106  *
1107  *      union mknoddata3 switch (ftype3 type) {
1108  *      case NF3CHR:
1109  *      case NF3BLK:
1110  *              devicedata3     device;
1111  *      case NF3SOCK:
1112  *      case NF3FIFO:
1113  *              sattr3          pipe_attributes;
1114  *      default:
1115  *              void;
1116  *      };
1117  *
1118  *      struct MKNOD3args {
1119  *              diropargs3      where;
1120  *              mknoddata3      what;
1121  *      };
1122  */
1123 static void encode_devicedata3(struct xdr_stream *xdr,
1124                                const struct nfs3_mknodargs *args)
1125 {
1126         encode_sattr3(xdr, args->sattr);
1127         encode_specdata3(xdr, args->rdev);
1128 }
1129
1130 static void encode_mknoddata3(struct xdr_stream *xdr,
1131                               const struct nfs3_mknodargs *args)
1132 {
1133         encode_ftype3(xdr, args->type);
1134         switch (args->type) {
1135         case NF3CHR:
1136         case NF3BLK:
1137                 encode_devicedata3(xdr, args);
1138                 break;
1139         case NF3SOCK:
1140         case NF3FIFO:
1141                 encode_sattr3(xdr, args->sattr);
1142                 break;
1143         case NF3REG:
1144         case NF3DIR:
1145                 break;
1146         default:
1147                 BUG();
1148         }
1149 }
1150
1151 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1152                                     struct xdr_stream *xdr,
1153                                     const struct nfs3_mknodargs *args)
1154 {
1155         encode_diropargs3(xdr, args->fh, args->name, args->len);
1156         encode_mknoddata3(xdr, args);
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 struct nfs_removeargs *args)
1169 {
1170         encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1171 }
1172
1173 /*
1174  * 3.3.14  RENAME3args
1175  *
1176  *      struct RENAME3args {
1177  *              diropargs3      from;
1178  *              diropargs3      to;
1179  *      };
1180  */
1181 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1182                                      struct xdr_stream *xdr,
1183                                      const struct nfs_renameargs *args)
1184 {
1185         const struct qstr *old = args->old_name;
1186         const struct qstr *new = args->new_name;
1187
1188         encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1189         encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1190 }
1191
1192 /*
1193  * 3.3.15  LINK3args
1194  *
1195  *      struct LINK3args {
1196  *              nfs_fh3         file;
1197  *              diropargs3      link;
1198  *      };
1199  */
1200 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1201                                    struct xdr_stream *xdr,
1202                                    const struct nfs3_linkargs *args)
1203 {
1204         encode_nfs_fh3(xdr, args->fromfh);
1205         encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1206 }
1207
1208 /*
1209  * 3.3.16  READDIR3args
1210  *
1211  *      struct READDIR3args {
1212  *              nfs_fh3         dir;
1213  *              cookie3         cookie;
1214  *              cookieverf3     cookieverf;
1215  *              count3          count;
1216  *      };
1217  */
1218 static void encode_readdir3args(struct xdr_stream *xdr,
1219                                 const struct nfs3_readdirargs *args)
1220 {
1221         __be32 *p;
1222
1223         encode_nfs_fh3(xdr, args->fh);
1224
1225         p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1226         p = xdr_encode_cookie3(p, args->cookie);
1227         p = xdr_encode_cookieverf3(p, args->verf);
1228         *p = cpu_to_be32(args->count);
1229 }
1230
1231 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1232                                       struct xdr_stream *xdr,
1233                                       const struct nfs3_readdirargs *args)
1234 {
1235         encode_readdir3args(xdr, args);
1236         prepare_reply_buffer(req, args->pages, 0,
1237                                 args->count, NFS3_readdirres_sz);
1238 }
1239
1240 /*
1241  * 3.3.17  READDIRPLUS3args
1242  *
1243  *      struct READDIRPLUS3args {
1244  *              nfs_fh3         dir;
1245  *              cookie3         cookie;
1246  *              cookieverf3     cookieverf;
1247  *              count3          dircount;
1248  *              count3          maxcount;
1249  *      };
1250  */
1251 static void encode_readdirplus3args(struct xdr_stream *xdr,
1252                                     const struct nfs3_readdirargs *args)
1253 {
1254         __be32 *p;
1255
1256         encode_nfs_fh3(xdr, args->fh);
1257
1258         p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1259         p = xdr_encode_cookie3(p, args->cookie);
1260         p = xdr_encode_cookieverf3(p, args->verf);
1261
1262         /*
1263          * readdirplus: need dircount + buffer size.
1264          * We just make sure we make dircount big enough
1265          */
1266         *p++ = cpu_to_be32(args->count >> 3);
1267
1268         *p = cpu_to_be32(args->count);
1269 }
1270
1271 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1272                                           struct xdr_stream *xdr,
1273                                           const struct nfs3_readdirargs *args)
1274 {
1275         encode_readdirplus3args(xdr, args);
1276         prepare_reply_buffer(req, args->pages, 0,
1277                                 args->count, NFS3_readdirres_sz);
1278 }
1279
1280 /*
1281  * 3.3.21  COMMIT3args
1282  *
1283  *      struct COMMIT3args {
1284  *              nfs_fh3         file;
1285  *              offset3         offset;
1286  *              count3          count;
1287  *      };
1288  */
1289 static void encode_commit3args(struct xdr_stream *xdr,
1290                                const struct nfs_writeargs *args)
1291 {
1292         __be32 *p;
1293
1294         encode_nfs_fh3(xdr, args->fh);
1295
1296         p = xdr_reserve_space(xdr, 8 + 4);
1297         p = xdr_encode_hyper(p, args->offset);
1298         *p = cpu_to_be32(args->count);
1299 }
1300
1301 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1302                                      struct xdr_stream *xdr,
1303                                      const struct nfs_writeargs *args)
1304 {
1305         encode_commit3args(xdr, args);
1306 }
1307
1308 #ifdef CONFIG_NFS_V3_ACL
1309
1310 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1311                                      struct xdr_stream *xdr,
1312                                      const struct nfs3_getaclargs *args)
1313 {
1314         encode_nfs_fh3(xdr, args->fh);
1315         encode_uint32(xdr, args->mask);
1316         if (args->mask & (NFS_ACL | NFS_DFACL))
1317                 prepare_reply_buffer(req, args->pages, 0,
1318                                         NFSACL_MAXPAGES << PAGE_SHIFT,
1319                                         ACL3_getaclres_sz);
1320 }
1321
1322 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1323                                      struct xdr_stream *xdr,
1324                                      const struct nfs3_setaclargs *args)
1325 {
1326         unsigned int base;
1327         int error;
1328
1329         encode_nfs_fh3(xdr, NFS_FH(args->inode));
1330         encode_uint32(xdr, args->mask);
1331         if (args->npages != 0)
1332                 xdr_write_pages(xdr, args->pages, 0, args->len);
1333
1334         base = req->rq_slen;
1335         error = nfsacl_encode(xdr->buf, base, args->inode,
1336                             (args->mask & NFS_ACL) ?
1337                             args->acl_access : NULL, 1, 0);
1338         BUG_ON(error < 0);
1339         error = nfsacl_encode(xdr->buf, base + error, args->inode,
1340                             (args->mask & NFS_DFACL) ?
1341                             args->acl_default : NULL, 1,
1342                             NFS_ACL_DEFAULT);
1343         BUG_ON(error < 0);
1344 }
1345
1346 #endif  /* CONFIG_NFS_V3_ACL */
1347
1348 /*
1349  * NFSv3 XDR decode functions
1350  *
1351  * NFSv3 result types are defined in section 3.3 of RFC 1813:
1352  * "NFS Version 3 Protocol Specification".
1353  */
1354
1355 /*
1356  * 3.3.1  GETATTR3res
1357  *
1358  *      struct GETATTR3resok {
1359  *              fattr3          obj_attributes;
1360  *      };
1361  *
1362  *      union GETATTR3res switch (nfsstat3 status) {
1363  *      case NFS3_OK:
1364  *              GETATTR3resok  resok;
1365  *      default:
1366  *              void;
1367  *      };
1368  */
1369 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1370                                     struct xdr_stream *xdr,
1371                                     struct nfs_fattr *result)
1372 {
1373         enum nfs_stat status;
1374         int error;
1375
1376         error = decode_nfsstat3(xdr, &status);
1377         if (unlikely(error))
1378                 goto out;
1379         if (status != NFS3_OK)
1380                 goto out_default;
1381         error = decode_fattr3(xdr, result);
1382 out:
1383         return error;
1384 out_default:
1385         return nfs_stat_to_errno(status);
1386 }
1387
1388 /*
1389  * 3.3.2  SETATTR3res
1390  *
1391  *      struct SETATTR3resok {
1392  *              wcc_data  obj_wcc;
1393  *      };
1394  *
1395  *      struct SETATTR3resfail {
1396  *              wcc_data  obj_wcc;
1397  *      };
1398  *
1399  *      union SETATTR3res switch (nfsstat3 status) {
1400  *      case NFS3_OK:
1401  *              SETATTR3resok   resok;
1402  *      default:
1403  *              SETATTR3resfail resfail;
1404  *      };
1405  */
1406 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1407                                     struct xdr_stream *xdr,
1408                                     struct nfs_fattr *result)
1409 {
1410         enum nfs_stat status;
1411         int error;
1412
1413         error = decode_nfsstat3(xdr, &status);
1414         if (unlikely(error))
1415                 goto out;
1416         error = decode_wcc_data(xdr, result);
1417         if (unlikely(error))
1418                 goto out;
1419         if (status != NFS3_OK)
1420                 goto out_status;
1421 out:
1422         return error;
1423 out_status:
1424         return nfs_stat_to_errno(status);
1425 }
1426
1427 /*
1428  * 3.3.3  LOOKUP3res
1429  *
1430  *      struct LOOKUP3resok {
1431  *              nfs_fh3         object;
1432  *              post_op_attr    obj_attributes;
1433  *              post_op_attr    dir_attributes;
1434  *      };
1435  *
1436  *      struct LOOKUP3resfail {
1437  *              post_op_attr    dir_attributes;
1438  *      };
1439  *
1440  *      union LOOKUP3res switch (nfsstat3 status) {
1441  *      case NFS3_OK:
1442  *              LOOKUP3resok    resok;
1443  *      default:
1444  *              LOOKUP3resfail  resfail;
1445  *      };
1446  */
1447 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1448                                    struct xdr_stream *xdr,
1449                                    struct nfs3_diropres *result)
1450 {
1451         enum nfs_stat status;
1452         int error;
1453
1454         error = decode_nfsstat3(xdr, &status);
1455         if (unlikely(error))
1456                 goto out;
1457         if (status != NFS3_OK)
1458                 goto out_default;
1459         error = decode_nfs_fh3(xdr, result->fh);
1460         if (unlikely(error))
1461                 goto out;
1462         error = decode_post_op_attr(xdr, result->fattr);
1463         if (unlikely(error))
1464                 goto out;
1465         error = decode_post_op_attr(xdr, result->dir_attr);
1466 out:
1467         return error;
1468 out_default:
1469         error = decode_post_op_attr(xdr, result->dir_attr);
1470         if (unlikely(error))
1471                 goto out;
1472         return nfs_stat_to_errno(status);
1473 }
1474
1475 /*
1476  * 3.3.4  ACCESS3res
1477  *
1478  *      struct ACCESS3resok {
1479  *              post_op_attr    obj_attributes;
1480  *              uint32          access;
1481  *      };
1482  *
1483  *      struct ACCESS3resfail {
1484  *              post_op_attr    obj_attributes;
1485  *      };
1486  *
1487  *      union ACCESS3res switch (nfsstat3 status) {
1488  *      case NFS3_OK:
1489  *              ACCESS3resok    resok;
1490  *      default:
1491  *              ACCESS3resfail  resfail;
1492  *      };
1493  */
1494 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1495                                    struct xdr_stream *xdr,
1496                                    struct nfs3_accessres *result)
1497 {
1498         enum nfs_stat status;
1499         int error;
1500
1501         error = decode_nfsstat3(xdr, &status);
1502         if (unlikely(error))
1503                 goto out;
1504         error = decode_post_op_attr(xdr, result->fattr);
1505         if (unlikely(error))
1506                 goto out;
1507         if (status != NFS3_OK)
1508                 goto out_default;
1509         error = decode_uint32(xdr, &result->access);
1510 out:
1511         return error;
1512 out_default:
1513         return nfs_stat_to_errno(status);
1514 }
1515
1516 /*
1517  * 3.3.5  READLINK3res
1518  *
1519  *      struct READLINK3resok {
1520  *              post_op_attr    symlink_attributes;
1521  *              nfspath3        data;
1522  *      };
1523  *
1524  *      struct READLINK3resfail {
1525  *              post_op_attr    symlink_attributes;
1526  *      };
1527  *
1528  *      union READLINK3res switch (nfsstat3 status) {
1529  *      case NFS3_OK:
1530  *              READLINK3resok  resok;
1531  *      default:
1532  *              READLINK3resfail resfail;
1533  *      };
1534  */
1535 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1536                                      struct xdr_stream *xdr,
1537                                      struct nfs_fattr *result)
1538 {
1539         enum nfs_stat status;
1540         int error;
1541
1542         error = decode_nfsstat3(xdr, &status);
1543         if (unlikely(error))
1544                 goto out;
1545         error = decode_post_op_attr(xdr, result);
1546         if (unlikely(error))
1547                 goto out;
1548         if (status != NFS3_OK)
1549                 goto out_default;
1550         error = decode_nfspath3(xdr);
1551 out:
1552         return error;
1553 out_default:
1554         return nfs_stat_to_errno(status);
1555 }
1556
1557 /*
1558  * 3.3.6  READ3res
1559  *
1560  *      struct READ3resok {
1561  *              post_op_attr    file_attributes;
1562  *              count3          count;
1563  *              bool            eof;
1564  *              opaque          data<>;
1565  *      };
1566  *
1567  *      struct READ3resfail {
1568  *              post_op_attr    file_attributes;
1569  *      };
1570  *
1571  *      union READ3res switch (nfsstat3 status) {
1572  *      case NFS3_OK:
1573  *              READ3resok      resok;
1574  *      default:
1575  *              READ3resfail    resfail;
1576  *      };
1577  */
1578 static int decode_read3resok(struct xdr_stream *xdr,
1579                              struct nfs_readres *result)
1580 {
1581         u32 eof, count, ocount, recvd;
1582         size_t hdrlen;
1583         __be32 *p;
1584
1585         p = xdr_inline_decode(xdr, 4 + 4 + 4);
1586         if (unlikely(p == NULL))
1587                 goto out_overflow;
1588         count = be32_to_cpup(p++);
1589         eof = be32_to_cpup(p++);
1590         ocount = be32_to_cpup(p++);
1591         if (unlikely(ocount != count))
1592                 goto out_mismatch;
1593         hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
1594         recvd = xdr->buf->len - hdrlen;
1595         if (unlikely(count > recvd))
1596                 goto out_cheating;
1597
1598 out:
1599         xdr_read_pages(xdr, count);
1600         result->eof = eof;
1601         result->count = count;
1602         return count;
1603 out_mismatch:
1604         dprintk("NFS: READ count doesn't match length of opaque: "
1605                 "count %u != ocount %u\n", count, ocount);
1606         return -EIO;
1607 out_cheating:
1608         dprintk("NFS: server cheating in read result: "
1609                 "count %u > recvd %u\n", count, recvd);
1610         count = recvd;
1611         eof = 0;
1612         goto out;
1613 out_overflow:
1614         print_overflow_msg(__func__, xdr);
1615         return -EIO;
1616 }
1617
1618 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1619                                  struct nfs_readres *result)
1620 {
1621         enum nfs_stat status;
1622         int error;
1623
1624         error = decode_nfsstat3(xdr, &status);
1625         if (unlikely(error))
1626                 goto out;
1627         error = decode_post_op_attr(xdr, result->fattr);
1628         if (unlikely(error))
1629                 goto out;
1630         if (status != NFS3_OK)
1631                 goto out_status;
1632         error = decode_read3resok(xdr, result);
1633 out:
1634         return error;
1635 out_status:
1636         return nfs_stat_to_errno(status);
1637 }
1638
1639 /*
1640  * 3.3.7  WRITE3res
1641  *
1642  *      enum stable_how {
1643  *              UNSTABLE  = 0,
1644  *              DATA_SYNC = 1,
1645  *              FILE_SYNC = 2
1646  *      };
1647  *
1648  *      struct WRITE3resok {
1649  *              wcc_data        file_wcc;
1650  *              count3          count;
1651  *              stable_how      committed;
1652  *              writeverf3      verf;
1653  *      };
1654  *
1655  *      struct WRITE3resfail {
1656  *              wcc_data        file_wcc;
1657  *      };
1658  *
1659  *      union WRITE3res switch (nfsstat3 status) {
1660  *      case NFS3_OK:
1661  *              WRITE3resok     resok;
1662  *      default:
1663  *              WRITE3resfail   resfail;
1664  *      };
1665  */
1666 static int decode_write3resok(struct xdr_stream *xdr,
1667                               struct nfs_writeres *result)
1668 {
1669         __be32 *p;
1670
1671         p = xdr_inline_decode(xdr, 4 + 4 + NFS3_WRITEVERFSIZE);
1672         if (unlikely(p == NULL))
1673                 goto out_overflow;
1674         result->count = be32_to_cpup(p++);
1675         result->verf->committed = be32_to_cpup(p++);
1676         if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1677                 goto out_badvalue;
1678         memcpy(result->verf->verifier, p, NFS3_WRITEVERFSIZE);
1679         return result->count;
1680 out_badvalue:
1681         dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1682         return -EIO;
1683 out_overflow:
1684         print_overflow_msg(__func__, xdr);
1685         return -EIO;
1686 }
1687
1688 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1689                                   struct nfs_writeres *result)
1690 {
1691         enum nfs_stat status;
1692         int error;
1693
1694         error = decode_nfsstat3(xdr, &status);
1695         if (unlikely(error))
1696                 goto out;
1697         error = decode_wcc_data(xdr, result->fattr);
1698         if (unlikely(error))
1699                 goto out;
1700         if (status != NFS3_OK)
1701                 goto out_status;
1702         error = decode_write3resok(xdr, result);
1703 out:
1704         return error;
1705 out_status:
1706         return nfs_stat_to_errno(status);
1707 }
1708
1709 /*
1710  * 3.3.8  CREATE3res
1711  *
1712  *      struct CREATE3resok {
1713  *              post_op_fh3     obj;
1714  *              post_op_attr    obj_attributes;
1715  *              wcc_data        dir_wcc;
1716  *      };
1717  *
1718  *      struct CREATE3resfail {
1719  *              wcc_data        dir_wcc;
1720  *      };
1721  *
1722  *      union CREATE3res switch (nfsstat3 status) {
1723  *      case NFS3_OK:
1724  *              CREATE3resok    resok;
1725  *      default:
1726  *              CREATE3resfail  resfail;
1727  *      };
1728  */
1729 static int decode_create3resok(struct xdr_stream *xdr,
1730                                struct nfs3_diropres *result)
1731 {
1732         int error;
1733
1734         error = decode_post_op_fh3(xdr, result->fh);
1735         if (unlikely(error))
1736                 goto out;
1737         error = decode_post_op_attr(xdr, result->fattr);
1738         if (unlikely(error))
1739                 goto out;
1740         /* The server isn't required to return a file handle.
1741          * If it didn't, force the client to perform a LOOKUP
1742          * to determine the correct file handle and attribute
1743          * values for the new object. */
1744         if (result->fh->size == 0)
1745                 result->fattr->valid = 0;
1746         error = decode_wcc_data(xdr, result->dir_attr);
1747 out:
1748         return error;
1749 }
1750
1751 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1752                                    struct xdr_stream *xdr,
1753                                    struct nfs3_diropres *result)
1754 {
1755         enum nfs_stat status;
1756         int error;
1757
1758         error = decode_nfsstat3(xdr, &status);
1759         if (unlikely(error))
1760                 goto out;
1761         if (status != NFS3_OK)
1762                 goto out_default;
1763         error = decode_create3resok(xdr, result);
1764 out:
1765         return error;
1766 out_default:
1767         error = decode_wcc_data(xdr, result->dir_attr);
1768         if (unlikely(error))
1769                 goto out;
1770         return nfs_stat_to_errno(status);
1771 }
1772
1773 /*
1774  * 3.3.12  REMOVE3res
1775  *
1776  *      struct REMOVE3resok {
1777  *              wcc_data    dir_wcc;
1778  *      };
1779  *
1780  *      struct REMOVE3resfail {
1781  *              wcc_data    dir_wcc;
1782  *      };
1783  *
1784  *      union REMOVE3res switch (nfsstat3 status) {
1785  *      case NFS3_OK:
1786  *              REMOVE3resok   resok;
1787  *      default:
1788  *              REMOVE3resfail resfail;
1789  *      };
1790  */
1791 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1792                                    struct xdr_stream *xdr,
1793                                    struct nfs_removeres *result)
1794 {
1795         enum nfs_stat status;
1796         int error;
1797
1798         error = decode_nfsstat3(xdr, &status);
1799         if (unlikely(error))
1800                 goto out;
1801         error = decode_wcc_data(xdr, result->dir_attr);
1802         if (unlikely(error))
1803                 goto out;
1804         if (status != NFS3_OK)
1805                 goto out_status;
1806 out:
1807         return error;
1808 out_status:
1809         return nfs_stat_to_errno(status);
1810 }
1811
1812 /*
1813  * 3.3.14  RENAME3res
1814  *
1815  *      struct RENAME3resok {
1816  *              wcc_data        fromdir_wcc;
1817  *              wcc_data        todir_wcc;
1818  *      };
1819  *
1820  *      struct RENAME3resfail {
1821  *              wcc_data        fromdir_wcc;
1822  *              wcc_data        todir_wcc;
1823  *      };
1824  *
1825  *      union RENAME3res switch (nfsstat3 status) {
1826  *      case NFS3_OK:
1827  *              RENAME3resok   resok;
1828  *      default:
1829  *              RENAME3resfail resfail;
1830  *      };
1831  */
1832 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1833                                    struct xdr_stream *xdr,
1834                                    struct nfs_renameres *result)
1835 {
1836         enum nfs_stat status;
1837         int error;
1838
1839         error = decode_nfsstat3(xdr, &status);
1840         if (unlikely(error))
1841                 goto out;
1842         error = decode_wcc_data(xdr, result->old_fattr);
1843         if (unlikely(error))
1844                 goto out;
1845         error = decode_wcc_data(xdr, result->new_fattr);
1846         if (unlikely(error))
1847                 goto out;
1848         if (status != NFS3_OK)
1849                 goto out_status;
1850 out:
1851         return error;
1852 out_status:
1853         return nfs_stat_to_errno(status);
1854 }
1855
1856 /*
1857  * 3.3.15  LINK3res
1858  *
1859  *      struct LINK3resok {
1860  *              post_op_attr    file_attributes;
1861  *              wcc_data        linkdir_wcc;
1862  *      };
1863  *
1864  *      struct LINK3resfail {
1865  *              post_op_attr    file_attributes;
1866  *              wcc_data        linkdir_wcc;
1867  *      };
1868  *
1869  *      union LINK3res switch (nfsstat3 status) {
1870  *      case NFS3_OK:
1871  *              LINK3resok      resok;
1872  *      default:
1873  *              LINK3resfail    resfail;
1874  *      };
1875  */
1876 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1877                                  struct nfs3_linkres *result)
1878 {
1879         enum nfs_stat status;
1880         int error;
1881
1882         error = decode_nfsstat3(xdr, &status);
1883         if (unlikely(error))
1884                 goto out;
1885         error = decode_post_op_attr(xdr, result->fattr);
1886         if (unlikely(error))
1887                 goto out;
1888         error = decode_wcc_data(xdr, result->dir_attr);
1889         if (unlikely(error))
1890                 goto out;
1891         if (status != NFS3_OK)
1892                 goto out_status;
1893 out:
1894         return error;
1895 out_status:
1896         return nfs_stat_to_errno(status);
1897 }
1898
1899 /**
1900  * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1901  *                      the local page cache
1902  * @xdr: XDR stream where entry resides
1903  * @entry: buffer to fill in with entry data
1904  * @plus: boolean indicating whether this should be a readdirplus entry
1905  *
1906  * Returns zero if successful, otherwise a negative errno value is
1907  * returned.
1908  *
1909  * This function is not invoked during READDIR reply decoding, but
1910  * rather whenever an application invokes the getdents(2) system call
1911  * on a directory already in our cache.
1912  *
1913  * 3.3.16  entry3
1914  *
1915  *      struct entry3 {
1916  *              fileid3         fileid;
1917  *              filename3       name;
1918  *              cookie3         cookie;
1919  *              fhandle3        filehandle;
1920  *              post_op_attr3   attributes;
1921  *              entry3          *nextentry;
1922  *      };
1923  *
1924  * 3.3.17  entryplus3
1925  *      struct entryplus3 {
1926  *              fileid3         fileid;
1927  *              filename3       name;
1928  *              cookie3         cookie;
1929  *              post_op_attr    name_attributes;
1930  *              post_op_fh3     name_handle;
1931  *              entryplus3      *nextentry;
1932  *      };
1933  */
1934 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1935                        int plus)
1936 {
1937         struct nfs_entry old = *entry;
1938         __be32 *p;
1939         int error;
1940
1941         p = xdr_inline_decode(xdr, 4);
1942         if (unlikely(p == NULL))
1943                 goto out_overflow;
1944         if (*p == xdr_zero) {
1945                 p = xdr_inline_decode(xdr, 4);
1946                 if (unlikely(p == NULL))
1947                         goto out_overflow;
1948                 if (*p == xdr_zero)
1949                         return -EAGAIN;
1950                 entry->eof = 1;
1951                 return -EBADCOOKIE;
1952         }
1953
1954         error = decode_fileid3(xdr, &entry->ino);
1955         if (unlikely(error))
1956                 return error;
1957
1958         error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1959         if (unlikely(error))
1960                 return error;
1961
1962         entry->prev_cookie = entry->cookie;
1963         error = decode_cookie3(xdr, &entry->cookie);
1964         if (unlikely(error))
1965                 return error;
1966
1967         entry->d_type = DT_UNKNOWN;
1968
1969         if (plus) {
1970                 entry->fattr->valid = 0;
1971                 error = decode_post_op_attr(xdr, entry->fattr);
1972                 if (unlikely(error))
1973                         return error;
1974                 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
1975                         entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
1976
1977                 /* In fact, a post_op_fh3: */
1978                 p = xdr_inline_decode(xdr, 4);
1979                 if (unlikely(p == NULL))
1980                         goto out_overflow;
1981                 if (*p != xdr_zero) {
1982                         error = decode_nfs_fh3(xdr, entry->fh);
1983                         if (unlikely(error)) {
1984                                 if (error == -E2BIG)
1985                                         goto out_truncated;
1986                                 return error;
1987                         }
1988                 } else
1989                         zero_nfs_fh3(entry->fh);
1990         }
1991
1992         return 0;
1993
1994 out_overflow:
1995         print_overflow_msg(__func__, xdr);
1996         return -EAGAIN;
1997 out_truncated:
1998         dprintk("NFS: directory entry contains invalid file handle\n");
1999         *entry = old;
2000         return -EAGAIN;
2001 }
2002
2003 /*
2004  * 3.3.16  READDIR3res
2005  *
2006  *      struct dirlist3 {
2007  *              entry3          *entries;
2008  *              bool            eof;
2009  *      };
2010  *
2011  *      struct READDIR3resok {
2012  *              post_op_attr    dir_attributes;
2013  *              cookieverf3     cookieverf;
2014  *              dirlist3        reply;
2015  *      };
2016  *
2017  *      struct READDIR3resfail {
2018  *              post_op_attr    dir_attributes;
2019  *      };
2020  *
2021  *      union READDIR3res switch (nfsstat3 status) {
2022  *      case NFS3_OK:
2023  *              READDIR3resok   resok;
2024  *      default:
2025  *              READDIR3resfail resfail;
2026  *      };
2027  *
2028  * Read the directory contents into the page cache, but otherwise
2029  * don't touch them.  The actual decoding is done by nfs3_decode_entry()
2030  * during subsequent nfs_readdir() calls.
2031  */
2032 static int decode_dirlist3(struct xdr_stream *xdr)
2033 {
2034         u32 recvd, pglen;
2035         size_t hdrlen;
2036
2037         pglen = xdr->buf->page_len;
2038         hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
2039         recvd = xdr->buf->len - hdrlen;
2040         if (unlikely(pglen > recvd))
2041                 goto out_cheating;
2042 out:
2043         xdr_read_pages(xdr, pglen);
2044         return pglen;
2045 out_cheating:
2046         dprintk("NFS: server cheating in readdir result: "
2047                 "pglen %u > recvd %u\n", pglen, recvd);
2048         pglen = recvd;
2049         goto out;
2050 }
2051
2052 static int decode_readdir3resok(struct xdr_stream *xdr,
2053                                 struct nfs3_readdirres *result)
2054 {
2055         int error;
2056
2057         error = decode_post_op_attr(xdr, result->dir_attr);
2058         if (unlikely(error))
2059                 goto out;
2060         /* XXX: do we need to check if result->verf != NULL ? */
2061         error = decode_cookieverf3(xdr, result->verf);
2062         if (unlikely(error))
2063                 goto out;
2064         error = decode_dirlist3(xdr);
2065 out:
2066         return error;
2067 }
2068
2069 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2070                                     struct xdr_stream *xdr,
2071                                     struct nfs3_readdirres *result)
2072 {
2073         enum nfs_stat status;
2074         int error;
2075
2076         error = decode_nfsstat3(xdr, &status);
2077         if (unlikely(error))
2078                 goto out;
2079         if (status != NFS3_OK)
2080                 goto out_default;
2081         error = decode_readdir3resok(xdr, result);
2082 out:
2083         return error;
2084 out_default:
2085         error = decode_post_op_attr(xdr, result->dir_attr);
2086         if (unlikely(error))
2087                 goto out;
2088         return nfs_stat_to_errno(status);
2089 }
2090
2091 /*
2092  * 3.3.18  FSSTAT3res
2093  *
2094  *      struct FSSTAT3resok {
2095  *              post_op_attr    obj_attributes;
2096  *              size3           tbytes;
2097  *              size3           fbytes;
2098  *              size3           abytes;
2099  *              size3           tfiles;
2100  *              size3           ffiles;
2101  *              size3           afiles;
2102  *              uint32          invarsec;
2103  *      };
2104  *
2105  *      struct FSSTAT3resfail {
2106  *              post_op_attr    obj_attributes;
2107  *      };
2108  *
2109  *      union FSSTAT3res switch (nfsstat3 status) {
2110  *      case NFS3_OK:
2111  *              FSSTAT3resok    resok;
2112  *      default:
2113  *              FSSTAT3resfail  resfail;
2114  *      };
2115  */
2116 static int decode_fsstat3resok(struct xdr_stream *xdr,
2117                                struct nfs_fsstat *result)
2118 {
2119         __be32 *p;
2120
2121         p = xdr_inline_decode(xdr, 8 * 6 + 4);
2122         if (unlikely(p == NULL))
2123                 goto out_overflow;
2124         p = xdr_decode_size3(p, &result->tbytes);
2125         p = xdr_decode_size3(p, &result->fbytes);
2126         p = xdr_decode_size3(p, &result->abytes);
2127         p = xdr_decode_size3(p, &result->tfiles);
2128         p = xdr_decode_size3(p, &result->ffiles);
2129         xdr_decode_size3(p, &result->afiles);
2130         /* ignore invarsec */
2131         return 0;
2132 out_overflow:
2133         print_overflow_msg(__func__, xdr);
2134         return -EIO;
2135 }
2136
2137 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2138                                    struct xdr_stream *xdr,
2139                                    struct nfs_fsstat *result)
2140 {
2141         enum nfs_stat status;
2142         int error;
2143
2144         error = decode_nfsstat3(xdr, &status);
2145         if (unlikely(error))
2146                 goto out;
2147         error = decode_post_op_attr(xdr, result->fattr);
2148         if (unlikely(error))
2149                 goto out;
2150         if (status != NFS3_OK)
2151                 goto out_status;
2152         error = decode_fsstat3resok(xdr, result);
2153 out:
2154         return error;
2155 out_status:
2156         return nfs_stat_to_errno(status);
2157 }
2158
2159 /*
2160  * 3.3.19  FSINFO3res
2161  *
2162  *      struct FSINFO3resok {
2163  *              post_op_attr    obj_attributes;
2164  *              uint32          rtmax;
2165  *              uint32          rtpref;
2166  *              uint32          rtmult;
2167  *              uint32          wtmax;
2168  *              uint32          wtpref;
2169  *              uint32          wtmult;
2170  *              uint32          dtpref;
2171  *              size3           maxfilesize;
2172  *              nfstime3        time_delta;
2173  *              uint32          properties;
2174  *      };
2175  *
2176  *      struct FSINFO3resfail {
2177  *              post_op_attr    obj_attributes;
2178  *      };
2179  *
2180  *      union FSINFO3res switch (nfsstat3 status) {
2181  *      case NFS3_OK:
2182  *              FSINFO3resok    resok;
2183  *      default:
2184  *              FSINFO3resfail  resfail;
2185  *      };
2186  */
2187 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2188                                struct nfs_fsinfo *result)
2189 {
2190         __be32 *p;
2191
2192         p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2193         if (unlikely(p == NULL))
2194                 goto out_overflow;
2195         result->rtmax  = be32_to_cpup(p++);
2196         result->rtpref = be32_to_cpup(p++);
2197         result->rtmult = be32_to_cpup(p++);
2198         result->wtmax  = be32_to_cpup(p++);
2199         result->wtpref = be32_to_cpup(p++);
2200         result->wtmult = be32_to_cpup(p++);
2201         result->dtpref = be32_to_cpup(p++);
2202         p = xdr_decode_size3(p, &result->maxfilesize);
2203         xdr_decode_nfstime3(p, &result->time_delta);
2204
2205         /* ignore properties */
2206         result->lease_time = 0;
2207         return 0;
2208 out_overflow:
2209         print_overflow_msg(__func__, xdr);
2210         return -EIO;
2211 }
2212
2213 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2214                                    struct xdr_stream *xdr,
2215                                    struct nfs_fsinfo *result)
2216 {
2217         enum nfs_stat status;
2218         int error;
2219
2220         error = decode_nfsstat3(xdr, &status);
2221         if (unlikely(error))
2222                 goto out;
2223         error = decode_post_op_attr(xdr, result->fattr);
2224         if (unlikely(error))
2225                 goto out;
2226         if (status != NFS3_OK)
2227                 goto out_status;
2228         error = decode_fsinfo3resok(xdr, result);
2229 out:
2230         return error;
2231 out_status:
2232         return nfs_stat_to_errno(status);
2233 }
2234
2235 /*
2236  * 3.3.20  PATHCONF3res
2237  *
2238  *      struct PATHCONF3resok {
2239  *              post_op_attr    obj_attributes;
2240  *              uint32          linkmax;
2241  *              uint32          name_max;
2242  *              bool            no_trunc;
2243  *              bool            chown_restricted;
2244  *              bool            case_insensitive;
2245  *              bool            case_preserving;
2246  *      };
2247  *
2248  *      struct PATHCONF3resfail {
2249  *              post_op_attr    obj_attributes;
2250  *      };
2251  *
2252  *      union PATHCONF3res switch (nfsstat3 status) {
2253  *      case NFS3_OK:
2254  *              PATHCONF3resok  resok;
2255  *      default:
2256  *              PATHCONF3resfail resfail;
2257  *      };
2258  */
2259 static int decode_pathconf3resok(struct xdr_stream *xdr,
2260                                  struct nfs_pathconf *result)
2261 {
2262         __be32 *p;
2263
2264         p = xdr_inline_decode(xdr, 4 * 6);
2265         if (unlikely(p == NULL))
2266                 goto out_overflow;
2267         result->max_link = be32_to_cpup(p++);
2268         result->max_namelen = be32_to_cpup(p);
2269         /* ignore remaining fields */
2270         return 0;
2271 out_overflow:
2272         print_overflow_msg(__func__, xdr);
2273         return -EIO;
2274 }
2275
2276 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2277                                      struct xdr_stream *xdr,
2278                                      struct nfs_pathconf *result)
2279 {
2280         enum nfs_stat status;
2281         int error;
2282
2283         error = decode_nfsstat3(xdr, &status);
2284         if (unlikely(error))
2285                 goto out;
2286         error = decode_post_op_attr(xdr, result->fattr);
2287         if (unlikely(error))
2288                 goto out;
2289         if (status != NFS3_OK)
2290                 goto out_status;
2291         error = decode_pathconf3resok(xdr, result);
2292 out:
2293         return error;
2294 out_status:
2295         return nfs_stat_to_errno(status);
2296 }
2297
2298 /*
2299  * 3.3.21  COMMIT3res
2300  *
2301  *      struct COMMIT3resok {
2302  *              wcc_data        file_wcc;
2303  *              writeverf3      verf;
2304  *      };
2305  *
2306  *      struct COMMIT3resfail {
2307  *              wcc_data        file_wcc;
2308  *      };
2309  *
2310  *      union COMMIT3res switch (nfsstat3 status) {
2311  *      case NFS3_OK:
2312  *              COMMIT3resok    resok;
2313  *      default:
2314  *              COMMIT3resfail  resfail;
2315  *      };
2316  */
2317 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2318                                    struct xdr_stream *xdr,
2319                                    struct nfs_writeres *result)
2320 {
2321         enum nfs_stat status;
2322         int error;
2323
2324         error = decode_nfsstat3(xdr, &status);
2325         if (unlikely(error))
2326                 goto out;
2327         error = decode_wcc_data(xdr, result->fattr);
2328         if (unlikely(error))
2329                 goto out;
2330         if (status != NFS3_OK)
2331                 goto out_status;
2332         error = decode_writeverf3(xdr, result->verf->verifier);
2333 out:
2334         return error;
2335 out_status:
2336         return nfs_stat_to_errno(status);
2337 }
2338
2339 #ifdef CONFIG_NFS_V3_ACL
2340
2341 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2342                                       struct nfs3_getaclres *result)
2343 {
2344         struct posix_acl **acl;
2345         unsigned int *aclcnt;
2346         size_t hdrlen;
2347         int error;
2348
2349         error = decode_post_op_attr(xdr, result->fattr);
2350         if (unlikely(error))
2351                 goto out;
2352         error = decode_uint32(xdr, &result->mask);
2353         if (unlikely(error))
2354                 goto out;
2355         error = -EINVAL;
2356         if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2357                 goto out;
2358
2359         hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
2360
2361         acl = NULL;
2362         if (result->mask & NFS_ACL)
2363                 acl = &result->acl_access;
2364         aclcnt = NULL;
2365         if (result->mask & NFS_ACLCNT)
2366                 aclcnt = &result->acl_access_count;
2367         error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2368         if (unlikely(error <= 0))
2369                 goto out;
2370
2371         acl = NULL;
2372         if (result->mask & NFS_DFACL)
2373                 acl = &result->acl_default;
2374         aclcnt = NULL;
2375         if (result->mask & NFS_DFACLCNT)
2376                 aclcnt = &result->acl_default_count;
2377         error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2378         if (unlikely(error <= 0))
2379                 return error;
2380         error = 0;
2381 out:
2382         return error;
2383 }
2384
2385 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2386                                    struct xdr_stream *xdr,
2387                                    struct nfs3_getaclres *result)
2388 {
2389         enum nfs_stat status;
2390         int error;
2391
2392         error = decode_nfsstat3(xdr, &status);
2393         if (unlikely(error))
2394                 goto out;
2395         if (status != NFS3_OK)
2396                 goto out_default;
2397         error = decode_getacl3resok(xdr, result);
2398 out:
2399         return error;
2400 out_default:
2401         return nfs_stat_to_errno(status);
2402 }
2403
2404 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2405                                    struct xdr_stream *xdr,
2406                                    struct nfs_fattr *result)
2407 {
2408         enum nfs_stat status;
2409         int error;
2410
2411         error = decode_nfsstat3(xdr, &status);
2412         if (unlikely(error))
2413                 goto out;
2414         if (status != NFS3_OK)
2415                 goto out_default;
2416         error = decode_post_op_attr(xdr, result);
2417 out:
2418         return error;
2419 out_default:
2420         return nfs_stat_to_errno(status);
2421 }
2422
2423 #endif  /* CONFIG_NFS_V3_ACL */
2424
2425 #define PROC(proc, argtype, restype, timer)                             \
2426 [NFS3PROC_##proc] = {                                                   \
2427         .p_proc      = NFS3PROC_##proc,                                 \
2428         .p_encode    = (kxdreproc_t)nfs3_xdr_enc_##argtype##3args,      \
2429         .p_decode    = (kxdrdproc_t)nfs3_xdr_dec_##restype##3res,       \
2430         .p_arglen    = NFS3_##argtype##args_sz,                         \
2431         .p_replen    = NFS3_##restype##res_sz,                          \
2432         .p_timer     = timer,                                           \
2433         .p_statidx   = NFS3PROC_##proc,                                 \
2434         .p_name      = #proc,                                           \
2435         }
2436
2437 struct rpc_procinfo     nfs3_procedures[] = {
2438         PROC(GETATTR,           getattr,        getattr,        1),
2439         PROC(SETATTR,           setattr,        setattr,        0),
2440         PROC(LOOKUP,            lookup,         lookup,         2),
2441         PROC(ACCESS,            access,         access,         1),
2442         PROC(READLINK,          readlink,       readlink,       3),
2443         PROC(READ,              read,           read,           3),
2444         PROC(WRITE,             write,          write,          4),
2445         PROC(CREATE,            create,         create,         0),
2446         PROC(MKDIR,             mkdir,          create,         0),
2447         PROC(SYMLINK,           symlink,        create,         0),
2448         PROC(MKNOD,             mknod,          create,         0),
2449         PROC(REMOVE,            remove,         remove,         0),
2450         PROC(RMDIR,             lookup,         setattr,        0),
2451         PROC(RENAME,            rename,         rename,         0),
2452         PROC(LINK,              link,           link,           0),
2453         PROC(READDIR,           readdir,        readdir,        3),
2454         PROC(READDIRPLUS,       readdirplus,    readdir,        3),
2455         PROC(FSSTAT,            getattr,        fsstat,         0),
2456         PROC(FSINFO,            getattr,        fsinfo,         0),
2457         PROC(PATHCONF,          getattr,        pathconf,       0),
2458         PROC(COMMIT,            commit,         commit,         5),
2459 };
2460
2461 struct rpc_version              nfs_version3 = {
2462         .number                 = 3,
2463         .nrprocs                = ARRAY_SIZE(nfs3_procedures),
2464         .procs                  = nfs3_procedures
2465 };
2466
2467 #ifdef CONFIG_NFS_V3_ACL
2468 static struct rpc_procinfo      nfs3_acl_procedures[] = {
2469         [ACLPROC3_GETACL] = {
2470                 .p_proc = ACLPROC3_GETACL,
2471                 .p_encode = (kxdreproc_t)nfs3_xdr_enc_getacl3args,
2472                 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_getacl3res,
2473                 .p_arglen = ACL3_getaclargs_sz,
2474                 .p_replen = ACL3_getaclres_sz,
2475                 .p_timer = 1,
2476                 .p_name = "GETACL",
2477         },
2478         [ACLPROC3_SETACL] = {
2479                 .p_proc = ACLPROC3_SETACL,
2480                 .p_encode = (kxdreproc_t)nfs3_xdr_enc_setacl3args,
2481                 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_setacl3res,
2482                 .p_arglen = ACL3_setaclargs_sz,
2483                 .p_replen = ACL3_setaclres_sz,
2484                 .p_timer = 0,
2485                 .p_name = "SETACL",
2486         },
2487 };
2488
2489 struct rpc_version              nfsacl_version3 = {
2490         .number                 = 3,
2491         .nrprocs                = sizeof(nfs3_acl_procedures)/
2492                                   sizeof(nfs3_acl_procedures[0]),
2493         .procs                  = nfs3_acl_procedures,
2494 };
2495 #endif  /* CONFIG_NFS_V3_ACL */