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
1332         base = req->rq_slen;
1333         if (args->npages != 0)
1334                 xdr_write_pages(xdr, args->pages, 0, args->len);
1335         else
1336                 xdr_reserve_space(xdr, NFS_ACL_INLINE_BUFSIZE);
1337
1338         error = nfsacl_encode(xdr->buf, base, args->inode,
1339                             (args->mask & NFS_ACL) ?
1340                             args->acl_access : NULL, 1, 0);
1341         BUG_ON(error < 0);
1342         error = nfsacl_encode(xdr->buf, base + error, args->inode,
1343                             (args->mask & NFS_DFACL) ?
1344                             args->acl_default : NULL, 1,
1345                             NFS_ACL_DEFAULT);
1346         BUG_ON(error < 0);
1347 }
1348
1349 #endif  /* CONFIG_NFS_V3_ACL */
1350
1351 /*
1352  * NFSv3 XDR decode functions
1353  *
1354  * NFSv3 result types are defined in section 3.3 of RFC 1813:
1355  * "NFS Version 3 Protocol Specification".
1356  */
1357
1358 /*
1359  * 3.3.1  GETATTR3res
1360  *
1361  *      struct GETATTR3resok {
1362  *              fattr3          obj_attributes;
1363  *      };
1364  *
1365  *      union GETATTR3res switch (nfsstat3 status) {
1366  *      case NFS3_OK:
1367  *              GETATTR3resok  resok;
1368  *      default:
1369  *              void;
1370  *      };
1371  */
1372 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1373                                     struct xdr_stream *xdr,
1374                                     struct nfs_fattr *result)
1375 {
1376         enum nfs_stat status;
1377         int error;
1378
1379         error = decode_nfsstat3(xdr, &status);
1380         if (unlikely(error))
1381                 goto out;
1382         if (status != NFS3_OK)
1383                 goto out_default;
1384         error = decode_fattr3(xdr, result);
1385 out:
1386         return error;
1387 out_default:
1388         return nfs_stat_to_errno(status);
1389 }
1390
1391 /*
1392  * 3.3.2  SETATTR3res
1393  *
1394  *      struct SETATTR3resok {
1395  *              wcc_data  obj_wcc;
1396  *      };
1397  *
1398  *      struct SETATTR3resfail {
1399  *              wcc_data  obj_wcc;
1400  *      };
1401  *
1402  *      union SETATTR3res switch (nfsstat3 status) {
1403  *      case NFS3_OK:
1404  *              SETATTR3resok   resok;
1405  *      default:
1406  *              SETATTR3resfail resfail;
1407  *      };
1408  */
1409 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1410                                     struct xdr_stream *xdr,
1411                                     struct nfs_fattr *result)
1412 {
1413         enum nfs_stat status;
1414         int error;
1415
1416         error = decode_nfsstat3(xdr, &status);
1417         if (unlikely(error))
1418                 goto out;
1419         error = decode_wcc_data(xdr, result);
1420         if (unlikely(error))
1421                 goto out;
1422         if (status != NFS3_OK)
1423                 goto out_status;
1424 out:
1425         return error;
1426 out_status:
1427         return nfs_stat_to_errno(status);
1428 }
1429
1430 /*
1431  * 3.3.3  LOOKUP3res
1432  *
1433  *      struct LOOKUP3resok {
1434  *              nfs_fh3         object;
1435  *              post_op_attr    obj_attributes;
1436  *              post_op_attr    dir_attributes;
1437  *      };
1438  *
1439  *      struct LOOKUP3resfail {
1440  *              post_op_attr    dir_attributes;
1441  *      };
1442  *
1443  *      union LOOKUP3res switch (nfsstat3 status) {
1444  *      case NFS3_OK:
1445  *              LOOKUP3resok    resok;
1446  *      default:
1447  *              LOOKUP3resfail  resfail;
1448  *      };
1449  */
1450 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1451                                    struct xdr_stream *xdr,
1452                                    struct nfs3_diropres *result)
1453 {
1454         enum nfs_stat status;
1455         int error;
1456
1457         error = decode_nfsstat3(xdr, &status);
1458         if (unlikely(error))
1459                 goto out;
1460         if (status != NFS3_OK)
1461                 goto out_default;
1462         error = decode_nfs_fh3(xdr, result->fh);
1463         if (unlikely(error))
1464                 goto out;
1465         error = decode_post_op_attr(xdr, result->fattr);
1466         if (unlikely(error))
1467                 goto out;
1468         error = decode_post_op_attr(xdr, result->dir_attr);
1469 out:
1470         return error;
1471 out_default:
1472         error = decode_post_op_attr(xdr, result->dir_attr);
1473         if (unlikely(error))
1474                 goto out;
1475         return nfs_stat_to_errno(status);
1476 }
1477
1478 /*
1479  * 3.3.4  ACCESS3res
1480  *
1481  *      struct ACCESS3resok {
1482  *              post_op_attr    obj_attributes;
1483  *              uint32          access;
1484  *      };
1485  *
1486  *      struct ACCESS3resfail {
1487  *              post_op_attr    obj_attributes;
1488  *      };
1489  *
1490  *      union ACCESS3res switch (nfsstat3 status) {
1491  *      case NFS3_OK:
1492  *              ACCESS3resok    resok;
1493  *      default:
1494  *              ACCESS3resfail  resfail;
1495  *      };
1496  */
1497 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1498                                    struct xdr_stream *xdr,
1499                                    struct nfs3_accessres *result)
1500 {
1501         enum nfs_stat status;
1502         int error;
1503
1504         error = decode_nfsstat3(xdr, &status);
1505         if (unlikely(error))
1506                 goto out;
1507         error = decode_post_op_attr(xdr, result->fattr);
1508         if (unlikely(error))
1509                 goto out;
1510         if (status != NFS3_OK)
1511                 goto out_default;
1512         error = decode_uint32(xdr, &result->access);
1513 out:
1514         return error;
1515 out_default:
1516         return nfs_stat_to_errno(status);
1517 }
1518
1519 /*
1520  * 3.3.5  READLINK3res
1521  *
1522  *      struct READLINK3resok {
1523  *              post_op_attr    symlink_attributes;
1524  *              nfspath3        data;
1525  *      };
1526  *
1527  *      struct READLINK3resfail {
1528  *              post_op_attr    symlink_attributes;
1529  *      };
1530  *
1531  *      union READLINK3res switch (nfsstat3 status) {
1532  *      case NFS3_OK:
1533  *              READLINK3resok  resok;
1534  *      default:
1535  *              READLINK3resfail resfail;
1536  *      };
1537  */
1538 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1539                                      struct xdr_stream *xdr,
1540                                      struct nfs_fattr *result)
1541 {
1542         enum nfs_stat status;
1543         int error;
1544
1545         error = decode_nfsstat3(xdr, &status);
1546         if (unlikely(error))
1547                 goto out;
1548         error = decode_post_op_attr(xdr, result);
1549         if (unlikely(error))
1550                 goto out;
1551         if (status != NFS3_OK)
1552                 goto out_default;
1553         error = decode_nfspath3(xdr);
1554 out:
1555         return error;
1556 out_default:
1557         return nfs_stat_to_errno(status);
1558 }
1559
1560 /*
1561  * 3.3.6  READ3res
1562  *
1563  *      struct READ3resok {
1564  *              post_op_attr    file_attributes;
1565  *              count3          count;
1566  *              bool            eof;
1567  *              opaque          data<>;
1568  *      };
1569  *
1570  *      struct READ3resfail {
1571  *              post_op_attr    file_attributes;
1572  *      };
1573  *
1574  *      union READ3res switch (nfsstat3 status) {
1575  *      case NFS3_OK:
1576  *              READ3resok      resok;
1577  *      default:
1578  *              READ3resfail    resfail;
1579  *      };
1580  */
1581 static int decode_read3resok(struct xdr_stream *xdr,
1582                              struct nfs_readres *result)
1583 {
1584         u32 eof, count, ocount, recvd;
1585         size_t hdrlen;
1586         __be32 *p;
1587
1588         p = xdr_inline_decode(xdr, 4 + 4 + 4);
1589         if (unlikely(p == NULL))
1590                 goto out_overflow;
1591         count = be32_to_cpup(p++);
1592         eof = be32_to_cpup(p++);
1593         ocount = be32_to_cpup(p++);
1594         if (unlikely(ocount != count))
1595                 goto out_mismatch;
1596         hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
1597         recvd = xdr->buf->len - hdrlen;
1598         if (unlikely(count > recvd))
1599                 goto out_cheating;
1600
1601 out:
1602         xdr_read_pages(xdr, count);
1603         result->eof = eof;
1604         result->count = count;
1605         return count;
1606 out_mismatch:
1607         dprintk("NFS: READ count doesn't match length of opaque: "
1608                 "count %u != ocount %u\n", count, ocount);
1609         return -EIO;
1610 out_cheating:
1611         dprintk("NFS: server cheating in read result: "
1612                 "count %u > recvd %u\n", count, recvd);
1613         count = recvd;
1614         eof = 0;
1615         goto out;
1616 out_overflow:
1617         print_overflow_msg(__func__, xdr);
1618         return -EIO;
1619 }
1620
1621 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1622                                  struct nfs_readres *result)
1623 {
1624         enum nfs_stat status;
1625         int error;
1626
1627         error = decode_nfsstat3(xdr, &status);
1628         if (unlikely(error))
1629                 goto out;
1630         error = decode_post_op_attr(xdr, result->fattr);
1631         if (unlikely(error))
1632                 goto out;
1633         if (status != NFS3_OK)
1634                 goto out_status;
1635         error = decode_read3resok(xdr, result);
1636 out:
1637         return error;
1638 out_status:
1639         return nfs_stat_to_errno(status);
1640 }
1641
1642 /*
1643  * 3.3.7  WRITE3res
1644  *
1645  *      enum stable_how {
1646  *              UNSTABLE  = 0,
1647  *              DATA_SYNC = 1,
1648  *              FILE_SYNC = 2
1649  *      };
1650  *
1651  *      struct WRITE3resok {
1652  *              wcc_data        file_wcc;
1653  *              count3          count;
1654  *              stable_how      committed;
1655  *              writeverf3      verf;
1656  *      };
1657  *
1658  *      struct WRITE3resfail {
1659  *              wcc_data        file_wcc;
1660  *      };
1661  *
1662  *      union WRITE3res switch (nfsstat3 status) {
1663  *      case NFS3_OK:
1664  *              WRITE3resok     resok;
1665  *      default:
1666  *              WRITE3resfail   resfail;
1667  *      };
1668  */
1669 static int decode_write3resok(struct xdr_stream *xdr,
1670                               struct nfs_writeres *result)
1671 {
1672         __be32 *p;
1673
1674         p = xdr_inline_decode(xdr, 4 + 4 + NFS3_WRITEVERFSIZE);
1675         if (unlikely(p == NULL))
1676                 goto out_overflow;
1677         result->count = be32_to_cpup(p++);
1678         result->verf->committed = be32_to_cpup(p++);
1679         if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1680                 goto out_badvalue;
1681         memcpy(result->verf->verifier, p, NFS3_WRITEVERFSIZE);
1682         return result->count;
1683 out_badvalue:
1684         dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1685         return -EIO;
1686 out_overflow:
1687         print_overflow_msg(__func__, xdr);
1688         return -EIO;
1689 }
1690
1691 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1692                                   struct nfs_writeres *result)
1693 {
1694         enum nfs_stat status;
1695         int error;
1696
1697         error = decode_nfsstat3(xdr, &status);
1698         if (unlikely(error))
1699                 goto out;
1700         error = decode_wcc_data(xdr, result->fattr);
1701         if (unlikely(error))
1702                 goto out;
1703         if (status != NFS3_OK)
1704                 goto out_status;
1705         error = decode_write3resok(xdr, result);
1706 out:
1707         return error;
1708 out_status:
1709         return nfs_stat_to_errno(status);
1710 }
1711
1712 /*
1713  * 3.3.8  CREATE3res
1714  *
1715  *      struct CREATE3resok {
1716  *              post_op_fh3     obj;
1717  *              post_op_attr    obj_attributes;
1718  *              wcc_data        dir_wcc;
1719  *      };
1720  *
1721  *      struct CREATE3resfail {
1722  *              wcc_data        dir_wcc;
1723  *      };
1724  *
1725  *      union CREATE3res switch (nfsstat3 status) {
1726  *      case NFS3_OK:
1727  *              CREATE3resok    resok;
1728  *      default:
1729  *              CREATE3resfail  resfail;
1730  *      };
1731  */
1732 static int decode_create3resok(struct xdr_stream *xdr,
1733                                struct nfs3_diropres *result)
1734 {
1735         int error;
1736
1737         error = decode_post_op_fh3(xdr, result->fh);
1738         if (unlikely(error))
1739                 goto out;
1740         error = decode_post_op_attr(xdr, result->fattr);
1741         if (unlikely(error))
1742                 goto out;
1743         /* The server isn't required to return a file handle.
1744          * If it didn't, force the client to perform a LOOKUP
1745          * to determine the correct file handle and attribute
1746          * values for the new object. */
1747         if (result->fh->size == 0)
1748                 result->fattr->valid = 0;
1749         error = decode_wcc_data(xdr, result->dir_attr);
1750 out:
1751         return error;
1752 }
1753
1754 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1755                                    struct xdr_stream *xdr,
1756                                    struct nfs3_diropres *result)
1757 {
1758         enum nfs_stat status;
1759         int error;
1760
1761         error = decode_nfsstat3(xdr, &status);
1762         if (unlikely(error))
1763                 goto out;
1764         if (status != NFS3_OK)
1765                 goto out_default;
1766         error = decode_create3resok(xdr, result);
1767 out:
1768         return error;
1769 out_default:
1770         error = decode_wcc_data(xdr, result->dir_attr);
1771         if (unlikely(error))
1772                 goto out;
1773         return nfs_stat_to_errno(status);
1774 }
1775
1776 /*
1777  * 3.3.12  REMOVE3res
1778  *
1779  *      struct REMOVE3resok {
1780  *              wcc_data    dir_wcc;
1781  *      };
1782  *
1783  *      struct REMOVE3resfail {
1784  *              wcc_data    dir_wcc;
1785  *      };
1786  *
1787  *      union REMOVE3res switch (nfsstat3 status) {
1788  *      case NFS3_OK:
1789  *              REMOVE3resok   resok;
1790  *      default:
1791  *              REMOVE3resfail resfail;
1792  *      };
1793  */
1794 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1795                                    struct xdr_stream *xdr,
1796                                    struct nfs_removeres *result)
1797 {
1798         enum nfs_stat status;
1799         int error;
1800
1801         error = decode_nfsstat3(xdr, &status);
1802         if (unlikely(error))
1803                 goto out;
1804         error = decode_wcc_data(xdr, result->dir_attr);
1805         if (unlikely(error))
1806                 goto out;
1807         if (status != NFS3_OK)
1808                 goto out_status;
1809 out:
1810         return error;
1811 out_status:
1812         return nfs_stat_to_errno(status);
1813 }
1814
1815 /*
1816  * 3.3.14  RENAME3res
1817  *
1818  *      struct RENAME3resok {
1819  *              wcc_data        fromdir_wcc;
1820  *              wcc_data        todir_wcc;
1821  *      };
1822  *
1823  *      struct RENAME3resfail {
1824  *              wcc_data        fromdir_wcc;
1825  *              wcc_data        todir_wcc;
1826  *      };
1827  *
1828  *      union RENAME3res switch (nfsstat3 status) {
1829  *      case NFS3_OK:
1830  *              RENAME3resok   resok;
1831  *      default:
1832  *              RENAME3resfail resfail;
1833  *      };
1834  */
1835 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1836                                    struct xdr_stream *xdr,
1837                                    struct nfs_renameres *result)
1838 {
1839         enum nfs_stat status;
1840         int error;
1841
1842         error = decode_nfsstat3(xdr, &status);
1843         if (unlikely(error))
1844                 goto out;
1845         error = decode_wcc_data(xdr, result->old_fattr);
1846         if (unlikely(error))
1847                 goto out;
1848         error = decode_wcc_data(xdr, result->new_fattr);
1849         if (unlikely(error))
1850                 goto out;
1851         if (status != NFS3_OK)
1852                 goto out_status;
1853 out:
1854         return error;
1855 out_status:
1856         return nfs_stat_to_errno(status);
1857 }
1858
1859 /*
1860  * 3.3.15  LINK3res
1861  *
1862  *      struct LINK3resok {
1863  *              post_op_attr    file_attributes;
1864  *              wcc_data        linkdir_wcc;
1865  *      };
1866  *
1867  *      struct LINK3resfail {
1868  *              post_op_attr    file_attributes;
1869  *              wcc_data        linkdir_wcc;
1870  *      };
1871  *
1872  *      union LINK3res switch (nfsstat3 status) {
1873  *      case NFS3_OK:
1874  *              LINK3resok      resok;
1875  *      default:
1876  *              LINK3resfail    resfail;
1877  *      };
1878  */
1879 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1880                                  struct nfs3_linkres *result)
1881 {
1882         enum nfs_stat status;
1883         int error;
1884
1885         error = decode_nfsstat3(xdr, &status);
1886         if (unlikely(error))
1887                 goto out;
1888         error = decode_post_op_attr(xdr, result->fattr);
1889         if (unlikely(error))
1890                 goto out;
1891         error = decode_wcc_data(xdr, result->dir_attr);
1892         if (unlikely(error))
1893                 goto out;
1894         if (status != NFS3_OK)
1895                 goto out_status;
1896 out:
1897         return error;
1898 out_status:
1899         return nfs_stat_to_errno(status);
1900 }
1901
1902 /**
1903  * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1904  *                      the local page cache
1905  * @xdr: XDR stream where entry resides
1906  * @entry: buffer to fill in with entry data
1907  * @plus: boolean indicating whether this should be a readdirplus entry
1908  *
1909  * Returns zero if successful, otherwise a negative errno value is
1910  * returned.
1911  *
1912  * This function is not invoked during READDIR reply decoding, but
1913  * rather whenever an application invokes the getdents(2) system call
1914  * on a directory already in our cache.
1915  *
1916  * 3.3.16  entry3
1917  *
1918  *      struct entry3 {
1919  *              fileid3         fileid;
1920  *              filename3       name;
1921  *              cookie3         cookie;
1922  *              fhandle3        filehandle;
1923  *              post_op_attr3   attributes;
1924  *              entry3          *nextentry;
1925  *      };
1926  *
1927  * 3.3.17  entryplus3
1928  *      struct entryplus3 {
1929  *              fileid3         fileid;
1930  *              filename3       name;
1931  *              cookie3         cookie;
1932  *              post_op_attr    name_attributes;
1933  *              post_op_fh3     name_handle;
1934  *              entryplus3      *nextentry;
1935  *      };
1936  */
1937 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1938                        int plus)
1939 {
1940         struct nfs_entry old = *entry;
1941         __be32 *p;
1942         int error;
1943
1944         p = xdr_inline_decode(xdr, 4);
1945         if (unlikely(p == NULL))
1946                 goto out_overflow;
1947         if (*p == xdr_zero) {
1948                 p = xdr_inline_decode(xdr, 4);
1949                 if (unlikely(p == NULL))
1950                         goto out_overflow;
1951                 if (*p == xdr_zero)
1952                         return -EAGAIN;
1953                 entry->eof = 1;
1954                 return -EBADCOOKIE;
1955         }
1956
1957         error = decode_fileid3(xdr, &entry->ino);
1958         if (unlikely(error))
1959                 return error;
1960
1961         error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1962         if (unlikely(error))
1963                 return error;
1964
1965         entry->prev_cookie = entry->cookie;
1966         error = decode_cookie3(xdr, &entry->cookie);
1967         if (unlikely(error))
1968                 return error;
1969
1970         entry->d_type = DT_UNKNOWN;
1971
1972         if (plus) {
1973                 entry->fattr->valid = 0;
1974                 error = decode_post_op_attr(xdr, entry->fattr);
1975                 if (unlikely(error))
1976                         return error;
1977                 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
1978                         entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
1979
1980                 /* In fact, a post_op_fh3: */
1981                 p = xdr_inline_decode(xdr, 4);
1982                 if (unlikely(p == NULL))
1983                         goto out_overflow;
1984                 if (*p != xdr_zero) {
1985                         error = decode_nfs_fh3(xdr, entry->fh);
1986                         if (unlikely(error)) {
1987                                 if (error == -E2BIG)
1988                                         goto out_truncated;
1989                                 return error;
1990                         }
1991                 } else
1992                         zero_nfs_fh3(entry->fh);
1993         }
1994
1995         return 0;
1996
1997 out_overflow:
1998         print_overflow_msg(__func__, xdr);
1999         return -EAGAIN;
2000 out_truncated:
2001         dprintk("NFS: directory entry contains invalid file handle\n");
2002         *entry = old;
2003         return -EAGAIN;
2004 }
2005
2006 /*
2007  * 3.3.16  READDIR3res
2008  *
2009  *      struct dirlist3 {
2010  *              entry3          *entries;
2011  *              bool            eof;
2012  *      };
2013  *
2014  *      struct READDIR3resok {
2015  *              post_op_attr    dir_attributes;
2016  *              cookieverf3     cookieverf;
2017  *              dirlist3        reply;
2018  *      };
2019  *
2020  *      struct READDIR3resfail {
2021  *              post_op_attr    dir_attributes;
2022  *      };
2023  *
2024  *      union READDIR3res switch (nfsstat3 status) {
2025  *      case NFS3_OK:
2026  *              READDIR3resok   resok;
2027  *      default:
2028  *              READDIR3resfail resfail;
2029  *      };
2030  *
2031  * Read the directory contents into the page cache, but otherwise
2032  * don't touch them.  The actual decoding is done by nfs3_decode_entry()
2033  * during subsequent nfs_readdir() calls.
2034  */
2035 static int decode_dirlist3(struct xdr_stream *xdr)
2036 {
2037         u32 recvd, pglen;
2038         size_t hdrlen;
2039
2040         pglen = xdr->buf->page_len;
2041         hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
2042         recvd = xdr->buf->len - hdrlen;
2043         if (unlikely(pglen > recvd))
2044                 goto out_cheating;
2045 out:
2046         xdr_read_pages(xdr, pglen);
2047         return pglen;
2048 out_cheating:
2049         dprintk("NFS: server cheating in readdir result: "
2050                 "pglen %u > recvd %u\n", pglen, recvd);
2051         pglen = recvd;
2052         goto out;
2053 }
2054
2055 static int decode_readdir3resok(struct xdr_stream *xdr,
2056                                 struct nfs3_readdirres *result)
2057 {
2058         int error;
2059
2060         error = decode_post_op_attr(xdr, result->dir_attr);
2061         if (unlikely(error))
2062                 goto out;
2063         /* XXX: do we need to check if result->verf != NULL ? */
2064         error = decode_cookieverf3(xdr, result->verf);
2065         if (unlikely(error))
2066                 goto out;
2067         error = decode_dirlist3(xdr);
2068 out:
2069         return error;
2070 }
2071
2072 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2073                                     struct xdr_stream *xdr,
2074                                     struct nfs3_readdirres *result)
2075 {
2076         enum nfs_stat status;
2077         int error;
2078
2079         error = decode_nfsstat3(xdr, &status);
2080         if (unlikely(error))
2081                 goto out;
2082         if (status != NFS3_OK)
2083                 goto out_default;
2084         error = decode_readdir3resok(xdr, result);
2085 out:
2086         return error;
2087 out_default:
2088         error = decode_post_op_attr(xdr, result->dir_attr);
2089         if (unlikely(error))
2090                 goto out;
2091         return nfs_stat_to_errno(status);
2092 }
2093
2094 /*
2095  * 3.3.18  FSSTAT3res
2096  *
2097  *      struct FSSTAT3resok {
2098  *              post_op_attr    obj_attributes;
2099  *              size3           tbytes;
2100  *              size3           fbytes;
2101  *              size3           abytes;
2102  *              size3           tfiles;
2103  *              size3           ffiles;
2104  *              size3           afiles;
2105  *              uint32          invarsec;
2106  *      };
2107  *
2108  *      struct FSSTAT3resfail {
2109  *              post_op_attr    obj_attributes;
2110  *      };
2111  *
2112  *      union FSSTAT3res switch (nfsstat3 status) {
2113  *      case NFS3_OK:
2114  *              FSSTAT3resok    resok;
2115  *      default:
2116  *              FSSTAT3resfail  resfail;
2117  *      };
2118  */
2119 static int decode_fsstat3resok(struct xdr_stream *xdr,
2120                                struct nfs_fsstat *result)
2121 {
2122         __be32 *p;
2123
2124         p = xdr_inline_decode(xdr, 8 * 6 + 4);
2125         if (unlikely(p == NULL))
2126                 goto out_overflow;
2127         p = xdr_decode_size3(p, &result->tbytes);
2128         p = xdr_decode_size3(p, &result->fbytes);
2129         p = xdr_decode_size3(p, &result->abytes);
2130         p = xdr_decode_size3(p, &result->tfiles);
2131         p = xdr_decode_size3(p, &result->ffiles);
2132         xdr_decode_size3(p, &result->afiles);
2133         /* ignore invarsec */
2134         return 0;
2135 out_overflow:
2136         print_overflow_msg(__func__, xdr);
2137         return -EIO;
2138 }
2139
2140 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2141                                    struct xdr_stream *xdr,
2142                                    struct nfs_fsstat *result)
2143 {
2144         enum nfs_stat status;
2145         int error;
2146
2147         error = decode_nfsstat3(xdr, &status);
2148         if (unlikely(error))
2149                 goto out;
2150         error = decode_post_op_attr(xdr, result->fattr);
2151         if (unlikely(error))
2152                 goto out;
2153         if (status != NFS3_OK)
2154                 goto out_status;
2155         error = decode_fsstat3resok(xdr, result);
2156 out:
2157         return error;
2158 out_status:
2159         return nfs_stat_to_errno(status);
2160 }
2161
2162 /*
2163  * 3.3.19  FSINFO3res
2164  *
2165  *      struct FSINFO3resok {
2166  *              post_op_attr    obj_attributes;
2167  *              uint32          rtmax;
2168  *              uint32          rtpref;
2169  *              uint32          rtmult;
2170  *              uint32          wtmax;
2171  *              uint32          wtpref;
2172  *              uint32          wtmult;
2173  *              uint32          dtpref;
2174  *              size3           maxfilesize;
2175  *              nfstime3        time_delta;
2176  *              uint32          properties;
2177  *      };
2178  *
2179  *      struct FSINFO3resfail {
2180  *              post_op_attr    obj_attributes;
2181  *      };
2182  *
2183  *      union FSINFO3res switch (nfsstat3 status) {
2184  *      case NFS3_OK:
2185  *              FSINFO3resok    resok;
2186  *      default:
2187  *              FSINFO3resfail  resfail;
2188  *      };
2189  */
2190 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2191                                struct nfs_fsinfo *result)
2192 {
2193         __be32 *p;
2194
2195         p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2196         if (unlikely(p == NULL))
2197                 goto out_overflow;
2198         result->rtmax  = be32_to_cpup(p++);
2199         result->rtpref = be32_to_cpup(p++);
2200         result->rtmult = be32_to_cpup(p++);
2201         result->wtmax  = be32_to_cpup(p++);
2202         result->wtpref = be32_to_cpup(p++);
2203         result->wtmult = be32_to_cpup(p++);
2204         result->dtpref = be32_to_cpup(p++);
2205         p = xdr_decode_size3(p, &result->maxfilesize);
2206         xdr_decode_nfstime3(p, &result->time_delta);
2207
2208         /* ignore properties */
2209         result->lease_time = 0;
2210         return 0;
2211 out_overflow:
2212         print_overflow_msg(__func__, xdr);
2213         return -EIO;
2214 }
2215
2216 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2217                                    struct xdr_stream *xdr,
2218                                    struct nfs_fsinfo *result)
2219 {
2220         enum nfs_stat status;
2221         int error;
2222
2223         error = decode_nfsstat3(xdr, &status);
2224         if (unlikely(error))
2225                 goto out;
2226         error = decode_post_op_attr(xdr, result->fattr);
2227         if (unlikely(error))
2228                 goto out;
2229         if (status != NFS3_OK)
2230                 goto out_status;
2231         error = decode_fsinfo3resok(xdr, result);
2232 out:
2233         return error;
2234 out_status:
2235         return nfs_stat_to_errno(status);
2236 }
2237
2238 /*
2239  * 3.3.20  PATHCONF3res
2240  *
2241  *      struct PATHCONF3resok {
2242  *              post_op_attr    obj_attributes;
2243  *              uint32          linkmax;
2244  *              uint32          name_max;
2245  *              bool            no_trunc;
2246  *              bool            chown_restricted;
2247  *              bool            case_insensitive;
2248  *              bool            case_preserving;
2249  *      };
2250  *
2251  *      struct PATHCONF3resfail {
2252  *              post_op_attr    obj_attributes;
2253  *      };
2254  *
2255  *      union PATHCONF3res switch (nfsstat3 status) {
2256  *      case NFS3_OK:
2257  *              PATHCONF3resok  resok;
2258  *      default:
2259  *              PATHCONF3resfail resfail;
2260  *      };
2261  */
2262 static int decode_pathconf3resok(struct xdr_stream *xdr,
2263                                  struct nfs_pathconf *result)
2264 {
2265         __be32 *p;
2266
2267         p = xdr_inline_decode(xdr, 4 * 6);
2268         if (unlikely(p == NULL))
2269                 goto out_overflow;
2270         result->max_link = be32_to_cpup(p++);
2271         result->max_namelen = be32_to_cpup(p);
2272         /* ignore remaining fields */
2273         return 0;
2274 out_overflow:
2275         print_overflow_msg(__func__, xdr);
2276         return -EIO;
2277 }
2278
2279 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2280                                      struct xdr_stream *xdr,
2281                                      struct nfs_pathconf *result)
2282 {
2283         enum nfs_stat status;
2284         int error;
2285
2286         error = decode_nfsstat3(xdr, &status);
2287         if (unlikely(error))
2288                 goto out;
2289         error = decode_post_op_attr(xdr, result->fattr);
2290         if (unlikely(error))
2291                 goto out;
2292         if (status != NFS3_OK)
2293                 goto out_status;
2294         error = decode_pathconf3resok(xdr, result);
2295 out:
2296         return error;
2297 out_status:
2298         return nfs_stat_to_errno(status);
2299 }
2300
2301 /*
2302  * 3.3.21  COMMIT3res
2303  *
2304  *      struct COMMIT3resok {
2305  *              wcc_data        file_wcc;
2306  *              writeverf3      verf;
2307  *      };
2308  *
2309  *      struct COMMIT3resfail {
2310  *              wcc_data        file_wcc;
2311  *      };
2312  *
2313  *      union COMMIT3res switch (nfsstat3 status) {
2314  *      case NFS3_OK:
2315  *              COMMIT3resok    resok;
2316  *      default:
2317  *              COMMIT3resfail  resfail;
2318  *      };
2319  */
2320 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2321                                    struct xdr_stream *xdr,
2322                                    struct nfs_writeres *result)
2323 {
2324         enum nfs_stat status;
2325         int error;
2326
2327         error = decode_nfsstat3(xdr, &status);
2328         if (unlikely(error))
2329                 goto out;
2330         error = decode_wcc_data(xdr, result->fattr);
2331         if (unlikely(error))
2332                 goto out;
2333         if (status != NFS3_OK)
2334                 goto out_status;
2335         error = decode_writeverf3(xdr, result->verf->verifier);
2336 out:
2337         return error;
2338 out_status:
2339         return nfs_stat_to_errno(status);
2340 }
2341
2342 #ifdef CONFIG_NFS_V3_ACL
2343
2344 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2345                                       struct nfs3_getaclres *result)
2346 {
2347         struct posix_acl **acl;
2348         unsigned int *aclcnt;
2349         size_t hdrlen;
2350         int error;
2351
2352         error = decode_post_op_attr(xdr, result->fattr);
2353         if (unlikely(error))
2354                 goto out;
2355         error = decode_uint32(xdr, &result->mask);
2356         if (unlikely(error))
2357                 goto out;
2358         error = -EINVAL;
2359         if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2360                 goto out;
2361
2362         hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
2363
2364         acl = NULL;
2365         if (result->mask & NFS_ACL)
2366                 acl = &result->acl_access;
2367         aclcnt = NULL;
2368         if (result->mask & NFS_ACLCNT)
2369                 aclcnt = &result->acl_access_count;
2370         error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2371         if (unlikely(error <= 0))
2372                 goto out;
2373
2374         acl = NULL;
2375         if (result->mask & NFS_DFACL)
2376                 acl = &result->acl_default;
2377         aclcnt = NULL;
2378         if (result->mask & NFS_DFACLCNT)
2379                 aclcnt = &result->acl_default_count;
2380         error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2381         if (unlikely(error <= 0))
2382                 return error;
2383         error = 0;
2384 out:
2385         return error;
2386 }
2387
2388 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2389                                    struct xdr_stream *xdr,
2390                                    struct nfs3_getaclres *result)
2391 {
2392         enum nfs_stat status;
2393         int error;
2394
2395         error = decode_nfsstat3(xdr, &status);
2396         if (unlikely(error))
2397                 goto out;
2398         if (status != NFS3_OK)
2399                 goto out_default;
2400         error = decode_getacl3resok(xdr, result);
2401 out:
2402         return error;
2403 out_default:
2404         return nfs_stat_to_errno(status);
2405 }
2406
2407 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2408                                    struct xdr_stream *xdr,
2409                                    struct nfs_fattr *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_post_op_attr(xdr, result);
2420 out:
2421         return error;
2422 out_default:
2423         return nfs_stat_to_errno(status);
2424 }
2425
2426 #endif  /* CONFIG_NFS_V3_ACL */
2427
2428 #define PROC(proc, argtype, restype, timer)                             \
2429 [NFS3PROC_##proc] = {                                                   \
2430         .p_proc      = NFS3PROC_##proc,                                 \
2431         .p_encode    = (kxdreproc_t)nfs3_xdr_enc_##argtype##3args,      \
2432         .p_decode    = (kxdrdproc_t)nfs3_xdr_dec_##restype##3res,       \
2433         .p_arglen    = NFS3_##argtype##args_sz,                         \
2434         .p_replen    = NFS3_##restype##res_sz,                          \
2435         .p_timer     = timer,                                           \
2436         .p_statidx   = NFS3PROC_##proc,                                 \
2437         .p_name      = #proc,                                           \
2438         }
2439
2440 struct rpc_procinfo     nfs3_procedures[] = {
2441         PROC(GETATTR,           getattr,        getattr,        1),
2442         PROC(SETATTR,           setattr,        setattr,        0),
2443         PROC(LOOKUP,            lookup,         lookup,         2),
2444         PROC(ACCESS,            access,         access,         1),
2445         PROC(READLINK,          readlink,       readlink,       3),
2446         PROC(READ,              read,           read,           3),
2447         PROC(WRITE,             write,          write,          4),
2448         PROC(CREATE,            create,         create,         0),
2449         PROC(MKDIR,             mkdir,          create,         0),
2450         PROC(SYMLINK,           symlink,        create,         0),
2451         PROC(MKNOD,             mknod,          create,         0),
2452         PROC(REMOVE,            remove,         remove,         0),
2453         PROC(RMDIR,             lookup,         setattr,        0),
2454         PROC(RENAME,            rename,         rename,         0),
2455         PROC(LINK,              link,           link,           0),
2456         PROC(READDIR,           readdir,        readdir,        3),
2457         PROC(READDIRPLUS,       readdirplus,    readdir,        3),
2458         PROC(FSSTAT,            getattr,        fsstat,         0),
2459         PROC(FSINFO,            getattr,        fsinfo,         0),
2460         PROC(PATHCONF,          getattr,        pathconf,       0),
2461         PROC(COMMIT,            commit,         commit,         5),
2462 };
2463
2464 struct rpc_version              nfs_version3 = {
2465         .number                 = 3,
2466         .nrprocs                = ARRAY_SIZE(nfs3_procedures),
2467         .procs                  = nfs3_procedures
2468 };
2469
2470 #ifdef CONFIG_NFS_V3_ACL
2471 static struct rpc_procinfo      nfs3_acl_procedures[] = {
2472         [ACLPROC3_GETACL] = {
2473                 .p_proc = ACLPROC3_GETACL,
2474                 .p_encode = (kxdreproc_t)nfs3_xdr_enc_getacl3args,
2475                 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_getacl3res,
2476                 .p_arglen = ACL3_getaclargs_sz,
2477                 .p_replen = ACL3_getaclres_sz,
2478                 .p_timer = 1,
2479                 .p_name = "GETACL",
2480         },
2481         [ACLPROC3_SETACL] = {
2482                 .p_proc = ACLPROC3_SETACL,
2483                 .p_encode = (kxdreproc_t)nfs3_xdr_enc_setacl3args,
2484                 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_setacl3res,
2485                 .p_arglen = ACL3_setaclargs_sz,
2486                 .p_replen = ACL3_setaclres_sz,
2487                 .p_timer = 0,
2488                 .p_name = "SETACL",
2489         },
2490 };
2491
2492 struct rpc_version              nfsacl_version3 = {
2493         .number                 = 3,
2494         .nrprocs                = sizeof(nfs3_acl_procedures)/
2495                                   sizeof(nfs3_acl_procedures[0]),
2496         .procs                  = nfs3_acl_procedures,
2497 };
2498 #endif  /* CONFIG_NFS_V3_ACL */