fs/nfs/nfs3xdr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/fs/nfs/nfs3xdr.c
   4  *
   5  * XDR functions to encode/decode NFSv3 RPC arguments and results.
   6  *
   7  * Copyright (C) 1996, 1997 Olaf Kirch
   8  */
   9
  10 #include <linux/param.h>
  11 #include <linux/time.h>
  12 #include <linux/mm.h>
  13 #include <linux/errno.h>
  14 #include <linux/string.h>
  15 #include <linux/in.h>
  16 #include <linux/pagemap.h>
  17 #include <linux/proc_fs.h>
  18 #include <linux/kdev_t.h>
  19 #include <linux/sunrpc/clnt.h>
  20 #include <linux/nfs.h>
  21 #include <linux/nfs3.h>
  22 #include <linux/nfs_fs.h>
  23 #include <linux/nfsacl.h>
  24 #include "nfstrace.h"
  25 #include "internal.h"
  26
  27 #define NFSDBG_FACILITY         NFSDBG_XDR
  28
  29 /* Mapping from NFS error code to "errno" error code. */
  30 #define errno_NFSERR_IO         EIO
  31
  32 /*
  33  * Declare the space requirements for NFS arguments and replies as
  34  * number of 32bit-words
  35  */
  36 #define NFS3_fhandle_sz         (1+16)
  37 #define NFS3_fh_sz              (NFS3_fhandle_sz)       /* shorthand */
  38 #define NFS3_sattr_sz           (15)
  39 #define NFS3_filename_sz        (1+(NFS3_MAXNAMLEN>>2))
  40 #define NFS3_path_sz            (1+(NFS3_MAXPATHLEN>>2))
  41 #define NFS3_fattr_sz           (21)
  42 #define NFS3_cookieverf_sz      (NFS3_COOKIEVERFSIZE>>2)
  43 #define NFS3_wcc_attr_sz        (6)
  44 #define NFS3_pre_op_attr_sz     (1+NFS3_wcc_attr_sz)
  45 #define NFS3_post_op_attr_sz    (1+NFS3_fattr_sz)
  46 #define NFS3_wcc_data_sz        (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
  47 #define NFS3_diropargs_sz       (NFS3_fh_sz+NFS3_filename_sz)
  48
  49 #define NFS3_getattrargs_sz     (NFS3_fh_sz)
  50 #define NFS3_setattrargs_sz     (NFS3_fh_sz+NFS3_sattr_sz+3)
  51 #define NFS3_lookupargs_sz      (NFS3_fh_sz+NFS3_filename_sz)
  52 #define NFS3_accessargs_sz      (NFS3_fh_sz+1)
  53 #define NFS3_readlinkargs_sz    (NFS3_fh_sz)
  54 #define NFS3_readargs_sz        (NFS3_fh_sz+3)
  55 #define NFS3_writeargs_sz       (NFS3_fh_sz+5)
  56 #define NFS3_createargs_sz      (NFS3_diropargs_sz+NFS3_sattr_sz)
  57 #define NFS3_mkdirargs_sz       (NFS3_diropargs_sz+NFS3_sattr_sz)
  58 #define NFS3_symlinkargs_sz     (NFS3_diropargs_sz+1+NFS3_sattr_sz)
  59 #define NFS3_mknodargs_sz       (NFS3_diropargs_sz+2+NFS3_sattr_sz)
  60 #define NFS3_removeargs_sz      (NFS3_fh_sz+NFS3_filename_sz)
  61 #define NFS3_renameargs_sz      (NFS3_diropargs_sz+NFS3_diropargs_sz)
  62 #define NFS3_linkargs_sz                (NFS3_fh_sz+NFS3_diropargs_sz)
  63 #define NFS3_readdirargs_sz     (NFS3_fh_sz+NFS3_cookieverf_sz+3)
  64 #define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
  65 #define NFS3_commitargs_sz      (NFS3_fh_sz+3)
  66
  67 #define NFS3_getattrres_sz      (1+NFS3_fattr_sz)
  68 #define NFS3_setattrres_sz      (1+NFS3_wcc_data_sz)
  69 #define NFS3_removeres_sz       (NFS3_setattrres_sz)
  70 #define NFS3_lookupres_sz       (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
  71 #define NFS3_accessres_sz       (1+NFS3_post_op_attr_sz+1)
  72 #define NFS3_readlinkres_sz     (1+NFS3_post_op_attr_sz+1+1)
  73 #define NFS3_readres_sz         (1+NFS3_post_op_attr_sz+3+1)
  74 #define NFS3_writeres_sz        (1+NFS3_wcc_data_sz+4)
  75 #define NFS3_createres_sz       (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
  76 #define NFS3_renameres_sz       (1+(2 * NFS3_wcc_data_sz))
  77 #define NFS3_linkres_sz         (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
  78 #define NFS3_readdirres_sz      (1+NFS3_post_op_attr_sz+2+1)
  79 #define NFS3_fsstatres_sz       (1+NFS3_post_op_attr_sz+13)
  80 #define NFS3_fsinfores_sz       (1+NFS3_post_op_attr_sz+12)
  81 #define NFS3_pathconfres_sz     (1+NFS3_post_op_attr_sz+6)
  82 #define NFS3_commitres_sz       (1+NFS3_wcc_data_sz+2)
  83
  84 #define ACL3_getaclargs_sz      (NFS3_fh_sz+1)
  85 #define ACL3_setaclargs_sz      (NFS3_fh_sz+1+ \
  86                                 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
  87 #define ACL3_getaclres_sz       (1+NFS3_post_op_attr_sz+1+ \
  88                                 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)+1)
  89 #define ACL3_setaclres_sz       (1+NFS3_post_op_attr_sz)
  90
  91 static int nfs3_stat_to_errno(enum nfs_stat);
  92
  93 /*
  94  * Map file type to S_IFMT bits
  95  */
  96 static const umode_t nfs_type2fmt[] = {
  97         [NF3BAD] = 0,
  98         [NF3REG] = S_IFREG,
  99         [NF3DIR] = S_IFDIR,
 100         [NF3BLK] = S_IFBLK,
 101         [NF3CHR] = S_IFCHR,
 102         [NF3LNK] = S_IFLNK,
 103         [NF3SOCK] = S_IFSOCK,
 104         [NF3FIFO] = S_IFIFO,
 105 };
 106
 107 /*
 108  * Encode/decode NFSv3 basic data types
 109  *
 110  * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
 111  * "NFS Version 3 Protocol Specification".
 112  *
 113  * Not all basic data types have their own encoding and decoding
 114  * functions.  For run-time efficiency, some data types are encoded
 115  * or decoded inline.
 116  */
 117
 118 static void encode_uint32(struct xdr_stream *xdr, u32 value)
 119 {
 120         __be32 *p = xdr_reserve_space(xdr, 4);
 121         *p = cpu_to_be32(value);
 122 }
 123
 124 static int decode_uint32(struct xdr_stream *xdr, u32 *value)
 125 {
 126         __be32 *p;
 127
 128         p = xdr_inline_decode(xdr, 4);
 129         if (unlikely(!p))
 130                 return -EIO;
 131         *value = be32_to_cpup(p);
 132         return 0;
 133 }
 134
 135 static int decode_uint64(struct xdr_stream *xdr, u64 *value)
 136 {
 137         __be32 *p;
 138
 139         p = xdr_inline_decode(xdr, 8);
 140         if (unlikely(!p))
 141                 return -EIO;
 142         xdr_decode_hyper(p, value);
 143         return 0;
 144 }
 145
 146 /*
 147  * fileid3
 148  *
 149  *      typedef uint64 fileid3;
 150  */
 151 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
 152 {
 153         return xdr_decode_hyper(p, fileid);
 154 }
 155
 156 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
 157 {
 158         return decode_uint64(xdr, fileid);
 159 }
 160
 161 /*
 162  * filename3
 163  *
 164  *      typedef string filename3<>;
 165  */
 166 static void encode_filename3(struct xdr_stream *xdr,
 167                              const char *name, u32 length)
 168 {
 169         __be32 *p;
 170
 171         WARN_ON_ONCE(length > NFS3_MAXNAMLEN);
 172         p = xdr_reserve_space(xdr, 4 + length);
 173         xdr_encode_opaque(p, name, length);
 174 }
 175
 176 static int decode_inline_filename3(struct xdr_stream *xdr,
 177                                    const char **name, u32 *length)
 178 {
 179         __be32 *p;
 180         u32 count;
 181
 182         p = xdr_inline_decode(xdr, 4);
 183         if (unlikely(!p))
 184                 return -EIO;
 185         count = be32_to_cpup(p);
 186         if (count > NFS3_MAXNAMLEN)
 187                 goto out_nametoolong;
 188         p = xdr_inline_decode(xdr, count);
 189         if (unlikely(!p))
 190                 return -EIO;
 191         *name = (const char *)p;
 192         *length = count;
 193         return 0;
 194
 195 out_nametoolong:
 196         dprintk("NFS: returned filename too long: %u\n", count);
 197         return -ENAMETOOLONG;
 198 }
 199
 200 /*
 201  * nfspath3
 202  *
 203  *      typedef string nfspath3<>;
 204  */
 205 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
 206                             const u32 length)
 207 {
 208         encode_uint32(xdr, length);
 209         xdr_write_pages(xdr, pages, 0, length);
 210 }
 211
 212 static int decode_nfspath3(struct xdr_stream *xdr)
 213 {
 214         u32 recvd, count;
 215         __be32 *p;
 216
 217         p = xdr_inline_decode(xdr, 4);
 218         if (unlikely(!p))
 219                 return -EIO;
 220         count = be32_to_cpup(p);
 221         if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
 222                 goto out_nametoolong;
 223         recvd = xdr_read_pages(xdr, count);
 224         if (unlikely(count > recvd))
 225                 goto out_cheating;
 226         xdr_terminate_string(xdr->buf, count);
 227         return 0;
 228
 229 out_nametoolong:
 230         dprintk("NFS: returned pathname too long: %u\n", count);
 231         return -ENAMETOOLONG;
 232 out_cheating:
 233         dprintk("NFS: server cheating in pathname result: "
 234                 "count %u > recvd %u\n", count, recvd);
 235         return -EIO;
 236 }
 237
 238 /*
 239  * cookie3
 240  *
 241  *      typedef uint64 cookie3
 242  */
 243 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
 244 {
 245         return xdr_encode_hyper(p, cookie);
 246 }
 247
 248 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
 249 {
 250         return decode_uint64(xdr, cookie);
 251 }
 252
 253 /*
 254  * cookieverf3
 255  *
 256  *      typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
 257  */
 258 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
 259 {
 260         memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
 261         return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
 262 }
 263
 264 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
 265 {
 266         __be32 *p;
 267
 268         p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
 269         if (unlikely(!p))
 270                 return -EIO;
 271         memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
 272         return 0;
 273 }
 274
 275 /*
 276  * createverf3
 277  *
 278  *      typedef opaque createverf3[NFS3_CREATEVERFSIZE];
 279  */
 280 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
 281 {
 282         __be32 *p;
 283
 284         p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
 285         memcpy(p, verifier, NFS3_CREATEVERFSIZE);
 286 }
 287
 288 static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
 289 {
 290         __be32 *p;
 291
 292         p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
 293         if (unlikely(!p))
 294                 return -EIO;
 295         memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
 296         return 0;
 297 }
 298
 299 /*
 300  * size3
 301  *
 302  *      typedef uint64 size3;
 303  */
 304 static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
 305 {
 306         return xdr_decode_hyper(p, size);
 307 }
 308
 309 /*
 310  * nfsstat3
 311  *
 312  *      enum nfsstat3 {
 313  *              NFS3_OK = 0,
 314  *              ...
 315  *      }
 316  */
 317 #define NFS3_OK         NFS_OK
 318
 319 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
 320 {
 321         __be32 *p;
 322
 323         p = xdr_inline_decode(xdr, 4);
 324         if (unlikely(!p))
 325                 return -EIO;
 326         if (unlikely(*p != cpu_to_be32(NFS3_OK)))
 327                 goto out_status;
 328         *status = 0;
 329         return 0;
 330 out_status:
 331         *status = be32_to_cpup(p);
 332         trace_nfs_xdr_status((int)*status);
 333         return 0;
 334 }
 335
 336 /*
 337  * ftype3
 338  *
 339  *      enum ftype3 {
 340  *              NF3REG  = 1,
 341  *              NF3DIR  = 2,
 342  *              NF3BLK  = 3,
 343  *              NF3CHR  = 4,
 344  *              NF3LNK  = 5,
 345  *              NF3SOCK = 6,
 346  *              NF3FIFO = 7
 347  *      };
 348  */
 349 static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
 350 {
 351         encode_uint32(xdr, type);
 352 }
 353
 354 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
 355 {
 356         u32 type;
 357
 358         type = be32_to_cpup(p++);
 359         if (type > NF3FIFO)
 360                 type = NF3NON;
 361         *mode = nfs_type2fmt[type];
 362         return p;
 363 }
 364
 365 /*
 366  * specdata3
 367  *
 368  *     struct specdata3 {
 369  *             uint32  specdata1;
 370  *             uint32  specdata2;
 371  *     };
 372  */
 373 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
 374 {
 375         __be32 *p;
 376
 377         p = xdr_reserve_space(xdr, 8);
 378         *p++ = cpu_to_be32(MAJOR(rdev));
 379         *p = cpu_to_be32(MINOR(rdev));
 380 }
 381
 382 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
 383 {
 384         unsigned int major, minor;
 385
 386         major = be32_to_cpup(p++);
 387         minor = be32_to_cpup(p++);
 388         *rdev = MKDEV(major, minor);
 389         if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
 390                 *rdev = 0;
 391         return p;
 392 }
 393
 394 /*
 395  * nfs_fh3
 396  *
 397  *      struct nfs_fh3 {
 398  *              opaque       data<NFS3_FHSIZE>;
 399  *      };
 400  */
 401 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
 402 {
 403         __be32 *p;
 404
 405         WARN_ON_ONCE(fh->size > NFS3_FHSIZE);
 406         p = xdr_reserve_space(xdr, 4 + fh->size);
 407         xdr_encode_opaque(p, fh->data, fh->size);
 408 }
 409
 410 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
 411 {
 412         u32 length;
 413         __be32 *p;
 414
 415         p = xdr_inline_decode(xdr, 4);
 416         if (unlikely(!p))
 417                 return -EIO;
 418         length = be32_to_cpup(p++);
 419         if (unlikely(length > NFS3_FHSIZE))
 420                 goto out_toobig;
 421         p = xdr_inline_decode(xdr, length);
 422         if (unlikely(!p))
 423                 return -EIO;
 424         fh->size = length;
 425         memcpy(fh->data, p, length);
 426         return 0;
 427 out_toobig:
 428         dprintk("NFS: file handle size (%u) too big\n", length);
 429         return -E2BIG;
 430 }
 431
 432 static void zero_nfs_fh3(struct nfs_fh *fh)
 433 {
 434         memset(fh, 0, sizeof(*fh));
 435 }
 436
 437 /*
 438  * nfstime3
 439  *
 440  *      struct nfstime3 {
 441  *              uint32  seconds;
 442  *              uint32  nseconds;
 443  *      };
 444  */
 445 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
 446 {
 447         *p++ = cpu_to_be32(timep->tv_sec);
 448         *p++ = cpu_to_be32(timep->tv_nsec);
 449         return p;
 450 }
 451
 452 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
 453 {
 454         timep->tv_sec = be32_to_cpup(p++);
 455         timep->tv_nsec = be32_to_cpup(p++);
 456         return p;
 457 }
 458
 459 /*
 460  * sattr3
 461  *
 462  *      enum time_how {
 463  *              DONT_CHANGE             = 0,
 464  *              SET_TO_SERVER_TIME      = 1,
 465  *              SET_TO_CLIENT_TIME      = 2
 466  *      };
 467  *
 468  *      union set_mode3 switch (bool set_it) {
 469  *      case TRUE:
 470  *              mode3   mode;
 471  *      default:
 472  *              void;
 473  *      };
 474  *
 475  *      union set_uid3 switch (bool set_it) {
 476  *      case TRUE:
 477  *              uid3    uid;
 478  *      default:
 479  *              void;
 480  *      };
 481  *
 482  *      union set_gid3 switch (bool set_it) {
 483  *      case TRUE:
 484  *              gid3    gid;
 485  *      default:
 486  *              void;
 487  *      };
 488  *
 489  *      union set_size3 switch (bool set_it) {
 490  *      case TRUE:
 491  *              size3   size;
 492  *      default:
 493  *              void;
 494  *      };
 495  *
 496  *      union set_atime switch (time_how set_it) {
 497  *      case SET_TO_CLIENT_TIME:
 498  *              nfstime3        atime;
 499  *      default:
 500  *              void;
 501  *      };
 502  *
 503  *      union set_mtime switch (time_how set_it) {
 504  *      case SET_TO_CLIENT_TIME:
 505  *              nfstime3  mtime;
 506  *      default:
 507  *              void;
 508  *      };
 509  *
 510  *      struct sattr3 {
 511  *              set_mode3       mode;
 512  *              set_uid3        uid;
 513  *              set_gid3        gid;
 514  *              set_size3       size;
 515  *              set_atime       atime;
 516  *              set_mtime       mtime;
 517  *      };
 518  */
 519 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
 520 {
 521         struct timespec ts;
 522         u32 nbytes;
 523         __be32 *p;
 524
 525         /*
 526          * In order to make only a single xdr_reserve_space() call,
 527          * pre-compute the total number of bytes to be reserved.
 528          * Six boolean values, one for each set_foo field, are always
 529          * present in the encoded result, so start there.
 530          */
 531         nbytes = 6 * 4;
 532         if (attr->ia_valid & ATTR_MODE)
 533                 nbytes += 4;
 534         if (attr->ia_valid & ATTR_UID)
 535                 nbytes += 4;
 536         if (attr->ia_valid & ATTR_GID)
 537                 nbytes += 4;
 538         if (attr->ia_valid & ATTR_SIZE)
 539                 nbytes += 8;
 540         if (attr->ia_valid & ATTR_ATIME_SET)
 541                 nbytes += 8;
 542         if (attr->ia_valid & ATTR_MTIME_SET)
 543                 nbytes += 8;
 544         p = xdr_reserve_space(xdr, nbytes);
 545
 546         if (attr->ia_valid & ATTR_MODE) {
 547                 *p++ = xdr_one;
 548                 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
 549         } else
 550                 *p++ = xdr_zero;
 551
 552         if (attr->ia_valid & ATTR_UID) {
 553                 *p++ = xdr_one;
 554                 *p++ = cpu_to_be32(from_kuid(&init_user_ns, attr->ia_uid));
 555         } else
 556                 *p++ = xdr_zero;
 557
 558         if (attr->ia_valid & ATTR_GID) {
 559                 *p++ = xdr_one;
 560                 *p++ = cpu_to_be32(from_kgid(&init_user_ns, attr->ia_gid));
 561         } else
 562                 *p++ = xdr_zero;
 563
 564         if (attr->ia_valid & ATTR_SIZE) {
 565                 *p++ = xdr_one;
 566                 p = xdr_encode_hyper(p, (u64)attr->ia_size);
 567         } else
 568                 *p++ = xdr_zero;
 569
 570         if (attr->ia_valid & ATTR_ATIME_SET) {
 571                 struct timespec ts;
 572                 *p++ = xdr_two;
 573                 ts = timespec64_to_timespec(attr->ia_atime);
 574                 p = xdr_encode_nfstime3(p, &ts);
 575         } else if (attr->ia_valid & ATTR_ATIME) {
 576                 *p++ = xdr_one;
 577         } else
 578                 *p++ = xdr_zero;
 579
 580         if (attr->ia_valid & ATTR_MTIME_SET) {
 581                 *p++ = xdr_two;
 582                 ts = timespec64_to_timespec(attr->ia_mtime);
 583                 xdr_encode_nfstime3(p, &ts);
 584         } else if (attr->ia_valid & ATTR_MTIME) {
 585                 *p = xdr_one;
 586         } else
 587                 *p = xdr_zero;
 588 }
 589
 590 /*
 591  * fattr3
 592  *
 593  *      struct fattr3 {
 594  *              ftype3          type;
 595  *              mode3           mode;
 596  *              uint32          nlink;
 597  *              uid3            uid;
 598  *              gid3            gid;
 599  *              size3           size;
 600  *              size3           used;
 601  *              specdata3       rdev;
 602  *              uint64          fsid;
 603  *              fileid3         fileid;
 604  *              nfstime3        atime;
 605  *              nfstime3        mtime;
 606  *              nfstime3        ctime;
 607  *      };
 608  */
 609 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 610 {
 611         umode_t fmode;
 612         __be32 *p;
 613
 614         p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
 615         if (unlikely(!p))
 616                 return -EIO;
 617
 618         p = xdr_decode_ftype3(p, &fmode);
 619
 620         fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
 621         fattr->nlink = be32_to_cpup(p++);
 622         fattr->uid = make_kuid(&init_user_ns, be32_to_cpup(p++));
 623         if (!uid_valid(fattr->uid))
 624                 goto out_uid;
 625         fattr->gid = make_kgid(&init_user_ns, be32_to_cpup(p++));
 626         if (!gid_valid(fattr->gid))
 627                 goto out_gid;
 628
 629         p = xdr_decode_size3(p, &fattr->size);
 630         p = xdr_decode_size3(p, &fattr->du.nfs3.used);
 631         p = xdr_decode_specdata3(p, &fattr->rdev);
 632
 633         p = xdr_decode_hyper(p, &fattr->fsid.major);
 634         fattr->fsid.minor = 0;
 635
 636         p = xdr_decode_fileid3(p, &fattr->fileid);
 637         p = xdr_decode_nfstime3(p, &fattr->atime);
 638         p = xdr_decode_nfstime3(p, &fattr->mtime);
 639         xdr_decode_nfstime3(p, &fattr->ctime);
 640         fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
 641
 642         fattr->valid |= NFS_ATTR_FATTR_V3;
 643         return 0;
 644 out_uid:
 645         dprintk("NFS: returned invalid uid\n");
 646         return -EINVAL;
 647 out_gid:
 648         dprintk("NFS: returned invalid gid\n");
 649         return -EINVAL;
 650 }
 651
 652 /*
 653  * post_op_attr
 654  *
 655  *      union post_op_attr switch (bool attributes_follow) {
 656  *      case TRUE:
 657  *              fattr3  attributes;
 658  *      case FALSE:
 659  *              void;
 660  *      };
 661  */
 662 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 663 {
 664         __be32 *p;
 665
 666         p = xdr_inline_decode(xdr, 4);
 667         if (unlikely(!p))
 668                 return -EIO;
 669         if (*p != xdr_zero)
 670                 return decode_fattr3(xdr, fattr);
 671         return 0;
 672 }
 673
 674 /*
 675  * wcc_attr
 676  *      struct wcc_attr {
 677  *              size3           size;
 678  *              nfstime3        mtime;
 679  *              nfstime3        ctime;
 680  *      };
 681  */
 682 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 683 {
 684         __be32 *p;
 685
 686         p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
 687         if (unlikely(!p))
 688                 return -EIO;
 689
 690         fattr->valid |= NFS_ATTR_FATTR_PRESIZE
 691                 | NFS_ATTR_FATTR_PRECHANGE
 692                 | NFS_ATTR_FATTR_PREMTIME
 693                 | NFS_ATTR_FATTR_PRECTIME;
 694
 695         p = xdr_decode_size3(p, &fattr->pre_size);
 696         p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
 697         xdr_decode_nfstime3(p, &fattr->pre_ctime);
 698         fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
 699
 700         return 0;
 701 }
 702
 703 /*
 704  * pre_op_attr
 705  *      union pre_op_attr switch (bool attributes_follow) {
 706  *      case TRUE:
 707  *              wcc_attr        attributes;
 708  *      case FALSE:
 709  *              void;
 710  *      };
 711  *
 712  * wcc_data
 713  *
 714  *      struct wcc_data {
 715  *              pre_op_attr     before;
 716  *              post_op_attr    after;
 717  *      };
 718  */
 719 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 720 {
 721         __be32 *p;
 722
 723         p = xdr_inline_decode(xdr, 4);
 724         if (unlikely(!p))
 725                 return -EIO;
 726         if (*p != xdr_zero)
 727                 return decode_wcc_attr(xdr, fattr);
 728         return 0;
 729 }
 730
 731 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 732 {
 733         int error;
 734
 735         error = decode_pre_op_attr(xdr, fattr);
 736         if (unlikely(error))
 737                 goto out;
 738         error = decode_post_op_attr(xdr, fattr);
 739 out:
 740         return error;
 741 }
 742
 743 /*
 744  * post_op_fh3
 745  *
 746  *      union post_op_fh3 switch (bool handle_follows) {
 747  *      case TRUE:
 748  *              nfs_fh3  handle;
 749  *      case FALSE:
 750  *              void;
 751  *      };
 752  */
 753 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
 754 {
 755         __be32 *p = xdr_inline_decode(xdr, 4);
 756         if (unlikely(!p))
 757                 return -EIO;
 758         if (*p != xdr_zero)
 759                 return decode_nfs_fh3(xdr, fh);
 760         zero_nfs_fh3(fh);
 761         return 0;
 762 }
 763
 764 /*
 765  * diropargs3
 766  *
 767  *      struct diropargs3 {
 768  *              nfs_fh3         dir;
 769  *              filename3       name;
 770  *      };
 771  */
 772 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
 773                               const char *name, u32 length)
 774 {
 775         encode_nfs_fh3(xdr, fh);
 776         encode_filename3(xdr, name, length);
 777 }
 778
 779
 780 /*
 781  * NFSv3 XDR encode functions
 782  *
 783  * NFSv3 argument types are defined in section 3.3 of RFC 1813:
 784  * "NFS Version 3 Protocol Specification".
 785  */
 786
 787 /*
 788  * 3.3.1  GETATTR3args
 789  *
 790  *      struct GETATTR3args {
 791  *              nfs_fh3  object;
 792  *      };
 793  */
 794 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
 795                                       struct xdr_stream *xdr,
 796                                       const void *data)
 797 {
 798         const struct nfs_fh *fh = data;
 799
 800         encode_nfs_fh3(xdr, fh);
 801 }
 802
 803 /*
 804  * 3.3.2  SETATTR3args
 805  *
 806  *      union sattrguard3 switch (bool check) {
 807  *      case TRUE:
 808  *              nfstime3  obj_ctime;
 809  *      case FALSE:
 810  *              void;
 811  *      };
 812  *
 813  *      struct SETATTR3args {
 814  *              nfs_fh3         object;
 815  *              sattr3          new_attributes;
 816  *              sattrguard3     guard;
 817  *      };
 818  */
 819 static void encode_sattrguard3(struct xdr_stream *xdr,
 820                                const struct nfs3_sattrargs *args)
 821 {
 822         __be32 *p;
 823
 824         if (args->guard) {
 825                 p = xdr_reserve_space(xdr, 4 + 8);
 826                 *p++ = xdr_one;
 827                 xdr_encode_nfstime3(p, &args->guardtime);
 828         } else {
 829                 p = xdr_reserve_space(xdr, 4);
 830                 *p = xdr_zero;
 831         }
 832 }
 833
 834 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
 835                                       struct xdr_stream *xdr,
 836                                       const void *data)
 837 {
 838         const struct nfs3_sattrargs *args = data;
 839         encode_nfs_fh3(xdr, args->fh);
 840         encode_sattr3(xdr, args->sattr);
 841         encode_sattrguard3(xdr, args);
 842 }
 843
 844 /*
 845  * 3.3.3  LOOKUP3args
 846  *
 847  *      struct LOOKUP3args {
 848  *              diropargs3  what;
 849  *      };
 850  */
 851 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
 852                                      struct xdr_stream *xdr,
 853                                      const void *data)
 854 {
 855         const struct nfs3_diropargs *args = data;
 856
 857         encode_diropargs3(xdr, args->fh, args->name, args->len);
 858 }
 859
 860 /*
 861  * 3.3.4  ACCESS3args
 862  *
 863  *      struct ACCESS3args {
 864  *              nfs_fh3         object;
 865  *              uint32          access;
 866  *      };
 867  */
 868 static void encode_access3args(struct xdr_stream *xdr,
 869                                const struct nfs3_accessargs *args)
 870 {
 871         encode_nfs_fh3(xdr, args->fh);
 872         encode_uint32(xdr, args->access);
 873 }
 874
 875 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
 876                                      struct xdr_stream *xdr,
 877                                      const void *data)
 878 {
 879         const struct nfs3_accessargs *args = data;
 880
 881         encode_access3args(xdr, args);
 882 }
 883
 884 /*
 885  * 3.3.5  READLINK3args
 886  *
 887  *      struct READLINK3args {
 888  *              nfs_fh3 symlink;
 889  *      };
 890  */
 891 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
 892                                        struct xdr_stream *xdr,
 893                                        const void *data)
 894 {
 895         const struct nfs3_readlinkargs *args = data;
 896
 897         encode_nfs_fh3(xdr, args->fh);
 898         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
 899                                 args->pglen, NFS3_readlinkres_sz);
 900 }
 901
 902 /*
 903  * 3.3.6  READ3args
 904  *
 905  *      struct READ3args {
 906  *              nfs_fh3         file;
 907  *              offset3         offset;
 908  *              count3          count;
 909  *      };
 910  */
 911 static void encode_read3args(struct xdr_stream *xdr,
 912                              const struct nfs_pgio_args *args)
 913 {
 914         __be32 *p;
 915
 916         encode_nfs_fh3(xdr, args->fh);
 917
 918         p = xdr_reserve_space(xdr, 8 + 4);
 919         p = xdr_encode_hyper(p, args->offset);
 920         *p = cpu_to_be32(args->count);
 921 }
 922
 923 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
 924                                    struct xdr_stream *xdr,
 925                                    const void *data)
 926 {
 927         const struct nfs_pgio_args *args = data;
 928         unsigned int replen = args->replen ? args->replen : NFS3_readres_sz;
 929
 930         encode_read3args(xdr, args);
 931         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
 932                                 args->count, replen);
 933         req->rq_rcv_buf.flags |= XDRBUF_READ;
 934 }
 935
 936 /*
 937  * 3.3.7  WRITE3args
 938  *
 939  *      enum stable_how {
 940  *              UNSTABLE  = 0,
 941  *              DATA_SYNC = 1,
 942  *              FILE_SYNC = 2
 943  *      };
 944  *
 945  *      struct WRITE3args {
 946  *              nfs_fh3         file;
 947  *              offset3         offset;
 948  *              count3          count;
 949  *              stable_how      stable;
 950  *              opaque          data<>;
 951  *      };
 952  */
 953 static void encode_write3args(struct xdr_stream *xdr,
 954                               const struct nfs_pgio_args *args)
 955 {
 956         __be32 *p;
 957
 958         encode_nfs_fh3(xdr, args->fh);
 959
 960         p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
 961         p = xdr_encode_hyper(p, args->offset);
 962         *p++ = cpu_to_be32(args->count);
 963         *p++ = cpu_to_be32(args->stable);
 964         *p = cpu_to_be32(args->count);
 965         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
 966 }
 967
 968 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
 969                                     struct xdr_stream *xdr,
 970                                     const void *data)
 971 {
 972         const struct nfs_pgio_args *args = data;
 973
 974         encode_write3args(xdr, args);
 975         xdr->buf->flags |= XDRBUF_WRITE;
 976 }
 977
 978 /*
 979  * 3.3.8  CREATE3args
 980  *
 981  *      enum createmode3 {
 982  *              UNCHECKED = 0,
 983  *              GUARDED   = 1,
 984  *              EXCLUSIVE = 2
 985  *      };
 986  *
 987  *      union createhow3 switch (createmode3 mode) {
 988  *      case UNCHECKED:
 989  *      case GUARDED:
 990  *              sattr3       obj_attributes;
 991  *      case EXCLUSIVE:
 992  *              createverf3  verf;
 993  *      };
 994  *
 995  *      struct CREATE3args {
 996  *              diropargs3      where;
 997  *              createhow3      how;
 998  *      };
 999  */
1000 static void encode_createhow3(struct xdr_stream *xdr,
1001                               const struct nfs3_createargs *args)
1002 {
1003         encode_uint32(xdr, args->createmode);
1004         switch (args->createmode) {
1005         case NFS3_CREATE_UNCHECKED:
1006         case NFS3_CREATE_GUARDED:
1007                 encode_sattr3(xdr, args->sattr);
1008                 break;
1009         case NFS3_CREATE_EXCLUSIVE:
1010                 encode_createverf3(xdr, args->verifier);
1011                 break;
1012         default:
1013                 BUG();
1014         }
1015 }
1016
1017 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1018                                      struct xdr_stream *xdr,
1019                                      const void *data)
1020 {
1021         const struct nfs3_createargs *args = data;
1022
1023         encode_diropargs3(xdr, args->fh, args->name, args->len);
1024         encode_createhow3(xdr, args);
1025 }
1026
1027 /*
1028  * 3.3.9  MKDIR3args
1029  *
1030  *      struct MKDIR3args {
1031  *              diropargs3      where;
1032  *              sattr3          attributes;
1033  *      };
1034  */
1035 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1036                                     struct xdr_stream *xdr,
1037                                     const void *data)
1038 {
1039         const struct nfs3_mkdirargs *args = data;
1040
1041         encode_diropargs3(xdr, args->fh, args->name, args->len);
1042         encode_sattr3(xdr, args->sattr);
1043 }
1044
1045 /*
1046  * 3.3.10  SYMLINK3args
1047  *
1048  *      struct symlinkdata3 {
1049  *              sattr3          symlink_attributes;
1050  *              nfspath3        symlink_data;
1051  *      };
1052  *
1053  *      struct SYMLINK3args {
1054  *              diropargs3      where;
1055  *              symlinkdata3    symlink;
1056  *      };
1057  */
1058 static void encode_symlinkdata3(struct xdr_stream *xdr,
1059                                 const void *data)
1060 {
1061         const struct nfs3_symlinkargs *args = data;
1062
1063         encode_sattr3(xdr, args->sattr);
1064         encode_nfspath3(xdr, args->pages, args->pathlen);
1065 }
1066
1067 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1068                                       struct xdr_stream *xdr,
1069                                       const void *data)
1070 {
1071         const struct nfs3_symlinkargs *args = data;
1072
1073         encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1074         encode_symlinkdata3(xdr, args);
1075         xdr->buf->flags |= XDRBUF_WRITE;
1076 }
1077
1078 /*
1079  * 3.3.11  MKNOD3args
1080  *
1081  *      struct devicedata3 {
1082  *              sattr3          dev_attributes;
1083  *              specdata3       spec;
1084  *      };
1085  *
1086  *      union mknoddata3 switch (ftype3 type) {
1087  *      case NF3CHR:
1088  *      case NF3BLK:
1089  *              devicedata3     device;
1090  *      case NF3SOCK:
1091  *      case NF3FIFO:
1092  *              sattr3          pipe_attributes;
1093  *      default:
1094  *              void;
1095  *      };
1096  *
1097  *      struct MKNOD3args {
1098  *              diropargs3      where;
1099  *              mknoddata3      what;
1100  *      };
1101  */
1102 static void encode_devicedata3(struct xdr_stream *xdr,
1103                                const struct nfs3_mknodargs *args)
1104 {
1105         encode_sattr3(xdr, args->sattr);
1106         encode_specdata3(xdr, args->rdev);
1107 }
1108
1109 static void encode_mknoddata3(struct xdr_stream *xdr,
1110                               const struct nfs3_mknodargs *args)
1111 {
1112         encode_ftype3(xdr, args->type);
1113         switch (args->type) {
1114         case NF3CHR:
1115         case NF3BLK:
1116                 encode_devicedata3(xdr, args);
1117                 break;
1118         case NF3SOCK:
1119         case NF3FIFO:
1120                 encode_sattr3(xdr, args->sattr);
1121                 break;
1122         case NF3REG:
1123         case NF3DIR:
1124                 break;
1125         default:
1126                 BUG();
1127         }
1128 }
1129
1130 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1131                                     struct xdr_stream *xdr,
1132                                     const void *data)
1133 {
1134         const struct nfs3_mknodargs *args = data;
1135
1136         encode_diropargs3(xdr, args->fh, args->name, args->len);
1137         encode_mknoddata3(xdr, args);
1138 }
1139
1140 /*
1141  * 3.3.12  REMOVE3args
1142  *
1143  *      struct REMOVE3args {
1144  *              diropargs3  object;
1145  *      };
1146  */
1147 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1148                                      struct xdr_stream *xdr,
1149                                      const void *data)
1150 {
1151         const struct nfs_removeargs *args = data;
1152
1153         encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1154 }
1155
1156 /*
1157  * 3.3.14  RENAME3args
1158  *
1159  *      struct RENAME3args {
1160  *              diropargs3      from;
1161  *              diropargs3      to;
1162  *      };
1163  */
1164 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1165                                      struct xdr_stream *xdr,
1166                                      const void *data)
1167 {
1168         const struct nfs_renameargs *args = data;
1169         const struct qstr *old = args->old_name;
1170         const struct qstr *new = args->new_name;
1171
1172         encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1173         encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1174 }
1175
1176 /*
1177  * 3.3.15  LINK3args
1178  *
1179  *      struct LINK3args {
1180  *              nfs_fh3         file;
1181  *              diropargs3      link;
1182  *      };
1183  */
1184 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1185                                    struct xdr_stream *xdr,
1186                                    const void *data)
1187 {
1188         const struct nfs3_linkargs *args = data;
1189
1190         encode_nfs_fh3(xdr, args->fromfh);
1191         encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1192 }
1193
1194 /*
1195  * 3.3.16  READDIR3args
1196  *
1197  *      struct READDIR3args {
1198  *              nfs_fh3         dir;
1199  *              cookie3         cookie;
1200  *              cookieverf3     cookieverf;
1201  *              count3          count;
1202  *      };
1203  */
1204 static void encode_readdir3args(struct xdr_stream *xdr,
1205                                 const struct nfs3_readdirargs *args)
1206 {
1207         __be32 *p;
1208
1209         encode_nfs_fh3(xdr, args->fh);
1210
1211         p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1212         p = xdr_encode_cookie3(p, args->cookie);
1213         p = xdr_encode_cookieverf3(p, args->verf);
1214         *p = cpu_to_be32(args->count);
1215 }
1216
1217 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1218                                       struct xdr_stream *xdr,
1219                                       const void *data)
1220 {
1221         const struct nfs3_readdirargs *args = data;
1222
1223         encode_readdir3args(xdr, args);
1224         rpc_prepare_reply_pages(req, args->pages, 0,
1225                                 args->count, NFS3_readdirres_sz);
1226 }
1227
1228 /*
1229  * 3.3.17  READDIRPLUS3args
1230  *
1231  *      struct READDIRPLUS3args {
1232  *              nfs_fh3         dir;
1233  *              cookie3         cookie;
1234  *              cookieverf3     cookieverf;
1235  *              count3          dircount;
1236  *              count3          maxcount;
1237  *      };
1238  */
1239 static void encode_readdirplus3args(struct xdr_stream *xdr,
1240                                     const struct nfs3_readdirargs *args)
1241 {
1242         __be32 *p;
1243
1244         encode_nfs_fh3(xdr, args->fh);
1245
1246         p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1247         p = xdr_encode_cookie3(p, args->cookie);
1248         p = xdr_encode_cookieverf3(p, args->verf);
1249
1250         /*
1251          * readdirplus: need dircount + buffer size.
1252          * We just make sure we make dircount big enough
1253          */
1254         *p++ = cpu_to_be32(args->count >> 3);
1255
1256         *p = cpu_to_be32(args->count);
1257 }
1258
1259 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1260                                           struct xdr_stream *xdr,
1261                                           const void *data)
1262 {
1263         const struct nfs3_readdirargs *args = data;
1264
1265         encode_readdirplus3args(xdr, args);
1266         rpc_prepare_reply_pages(req, args->pages, 0,
1267                                 args->count, NFS3_readdirres_sz);
1268 }
1269
1270 /*
1271  * 3.3.21  COMMIT3args
1272  *
1273  *      struct COMMIT3args {
1274  *              nfs_fh3         file;
1275  *              offset3         offset;
1276  *              count3          count;
1277  *      };
1278  */
1279 static void encode_commit3args(struct xdr_stream *xdr,
1280                                const struct nfs_commitargs *args)
1281 {
1282         __be32 *p;
1283
1284         encode_nfs_fh3(xdr, args->fh);
1285
1286         p = xdr_reserve_space(xdr, 8 + 4);
1287         p = xdr_encode_hyper(p, args->offset);
1288         *p = cpu_to_be32(args->count);
1289 }
1290
1291 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1292                                      struct xdr_stream *xdr,
1293                                      const void *data)
1294 {
1295         const struct nfs_commitargs *args = data;
1296
1297         encode_commit3args(xdr, args);
1298 }
1299
1300 #ifdef CONFIG_NFS_V3_ACL
1301
1302 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1303                                      struct xdr_stream *xdr,
1304                                      const void *data)
1305 {
1306         const struct nfs3_getaclargs *args = data;
1307
1308         encode_nfs_fh3(xdr, args->fh);
1309         encode_uint32(xdr, args->mask);
1310         if (args->mask & (NFS_ACL | NFS_DFACL)) {
1311                 rpc_prepare_reply_pages(req, args->pages, 0,
1312                                         NFSACL_MAXPAGES << PAGE_SHIFT,
1313                                         ACL3_getaclres_sz);
1314                 req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES;
1315         }
1316 }
1317
1318 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1319                                      struct xdr_stream *xdr,
1320                                      const void *data)
1321 {
1322         const struct nfs3_setaclargs *args = data;
1323         unsigned int base;
1324         int error;
1325
1326         encode_nfs_fh3(xdr, NFS_FH(args->inode));
1327         encode_uint32(xdr, args->mask);
1328
1329         base = req->rq_slen;
1330         if (args->npages != 0)
1331                 xdr_write_pages(xdr, args->pages, 0, args->len);
1332         else
1333                 xdr_reserve_space(xdr, args->len);
1334
1335         error = nfsacl_encode(xdr->buf, base, args->inode,
1336                             (args->mask & NFS_ACL) ?
1337                             args->acl_access : NULL, 1, 0);
1338         /* FIXME: this is just broken */
1339         BUG_ON(error < 0);
1340         error = nfsacl_encode(xdr->buf, base + error, args->inode,
1341                             (args->mask & NFS_DFACL) ?
1342                             args->acl_default : NULL, 1,
1343                             NFS_ACL_DEFAULT);
1344         BUG_ON(error < 0);
1345 }
1346
1347 #endif  /* CONFIG_NFS_V3_ACL */
1348
1349 /*
1350  * NFSv3 XDR decode functions
1351  *
1352  * NFSv3 result types are defined in section 3.3 of RFC 1813:
1353  * "NFS Version 3 Protocol Specification".
1354  */
1355
1356 /*
1357  * 3.3.1  GETATTR3res
1358  *
1359  *      struct GETATTR3resok {
1360  *              fattr3          obj_attributes;
1361  *      };
1362  *
1363  *      union GETATTR3res switch (nfsstat3 status) {
1364  *      case NFS3_OK:
1365  *              GETATTR3resok  resok;
1366  *      default:
1367  *              void;
1368  *      };
1369  */
1370 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1371                                     struct xdr_stream *xdr,
1372                                     void *result)
1373 {
1374         enum nfs_stat status;
1375         int error;
1376
1377         error = decode_nfsstat3(xdr, &status);
1378         if (unlikely(error))
1379                 goto out;
1380         if (status != NFS3_OK)
1381                 goto out_default;
1382         error = decode_fattr3(xdr, result);
1383 out:
1384         return error;
1385 out_default:
1386         return nfs3_stat_to_errno(status);
1387 }
1388
1389 /*
1390  * 3.3.2  SETATTR3res
1391  *
1392  *      struct SETATTR3resok {
1393  *              wcc_data  obj_wcc;
1394  *      };
1395  *
1396  *      struct SETATTR3resfail {
1397  *              wcc_data  obj_wcc;
1398  *      };
1399  *
1400  *      union SETATTR3res switch (nfsstat3 status) {
1401  *      case NFS3_OK:
1402  *              SETATTR3resok   resok;
1403  *      default:
1404  *              SETATTR3resfail resfail;
1405  *      };
1406  */
1407 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1408                                     struct xdr_stream *xdr,
1409                                     void *result)
1410 {
1411         enum nfs_stat status;
1412         int error;
1413
1414         error = decode_nfsstat3(xdr, &status);
1415         if (unlikely(error))
1416                 goto out;
1417         error = decode_wcc_data(xdr, result);
1418         if (unlikely(error))
1419                 goto out;
1420         if (status != NFS3_OK)
1421                 goto out_status;
1422 out:
1423         return error;
1424 out_status:
1425         return nfs3_stat_to_errno(status);
1426 }
1427
1428 /*
1429  * 3.3.3  LOOKUP3res
1430  *
1431  *      struct LOOKUP3resok {
1432  *              nfs_fh3         object;
1433  *              post_op_attr    obj_attributes;
1434  *              post_op_attr    dir_attributes;
1435  *      };
1436  *
1437  *      struct LOOKUP3resfail {
1438  *              post_op_attr    dir_attributes;
1439  *      };
1440  *
1441  *      union LOOKUP3res switch (nfsstat3 status) {
1442  *      case NFS3_OK:
1443  *              LOOKUP3resok    resok;
1444  *      default:
1445  *              LOOKUP3resfail  resfail;
1446  *      };
1447  */
1448 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1449                                    struct xdr_stream *xdr,
1450                                    void *data)
1451 {
1452         struct nfs3_diropres *result = data;
1453         enum nfs_stat status;
1454         int error;
1455
1456         error = decode_nfsstat3(xdr, &status);
1457         if (unlikely(error))
1458                 goto out;
1459         if (status != NFS3_OK)
1460                 goto out_default;
1461         error = decode_nfs_fh3(xdr, result->fh);
1462         if (unlikely(error))
1463                 goto out;
1464         error = decode_post_op_attr(xdr, result->fattr);
1465         if (unlikely(error))
1466                 goto out;
1467         error = decode_post_op_attr(xdr, result->dir_attr);
1468 out:
1469         return error;
1470 out_default:
1471         error = decode_post_op_attr(xdr, result->dir_attr);
1472         if (unlikely(error))
1473                 goto out;
1474         return nfs3_stat_to_errno(status);
1475 }
1476
1477 /*
1478  * 3.3.4  ACCESS3res
1479  *
1480  *      struct ACCESS3resok {
1481  *              post_op_attr    obj_attributes;
1482  *              uint32          access;
1483  *      };
1484  *
1485  *      struct ACCESS3resfail {
1486  *              post_op_attr    obj_attributes;
1487  *      };
1488  *
1489  *      union ACCESS3res switch (nfsstat3 status) {
1490  *      case NFS3_OK:
1491  *              ACCESS3resok    resok;
1492  *      default:
1493  *              ACCESS3resfail  resfail;
1494  *      };
1495  */
1496 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1497                                    struct xdr_stream *xdr,
1498                                    void *data)
1499 {
1500         struct nfs3_accessres *result = data;
1501         enum nfs_stat status;
1502         int error;
1503
1504         error = decode_nfsstat3(xdr, &status);
1505         if (unlikely(error))
1506                 goto out;
1507         error = decode_post_op_attr(xdr, result->fattr);
1508         if (unlikely(error))
1509                 goto out;
1510         if (status != NFS3_OK)
1511                 goto out_default;
1512         error = decode_uint32(xdr, &result->access);
1513 out:
1514         return error;
1515 out_default:
1516         return nfs3_stat_to_errno(status);
1517 }
1518
1519 /*
1520  * 3.3.5  READLINK3res
1521  *
1522  *      struct READLINK3resok {
1523  *              post_op_attr    symlink_attributes;
1524  *              nfspath3        data;
1525  *      };
1526  *
1527  *      struct READLINK3resfail {
1528  *              post_op_attr    symlink_attributes;
1529  *      };
1530  *
1531  *      union READLINK3res switch (nfsstat3 status) {
1532  *      case NFS3_OK:
1533  *              READLINK3resok  resok;
1534  *      default:
1535  *              READLINK3resfail resfail;
1536  *      };
1537  */
1538 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1539                                      struct xdr_stream *xdr,
1540                                      void *result)
1541 {
1542         enum nfs_stat status;
1543         int error;
1544
1545         error = decode_nfsstat3(xdr, &status);
1546         if (unlikely(error))
1547                 goto out;
1548         error = decode_post_op_attr(xdr, result);
1549         if (unlikely(error))
1550                 goto out;
1551         if (status != NFS3_OK)
1552                 goto out_default;
1553         error = decode_nfspath3(xdr);
1554 out:
1555         return error;
1556 out_default:
1557         return nfs3_stat_to_errno(status);
1558 }
1559
1560 /*
1561  * 3.3.6  READ3res
1562  *
1563  *      struct READ3resok {
1564  *              post_op_attr    file_attributes;
1565  *              count3          count;
1566  *              bool            eof;
1567  *              opaque          data<>;
1568  *      };
1569  *
1570  *      struct READ3resfail {
1571  *              post_op_attr    file_attributes;
1572  *      };
1573  *
1574  *      union READ3res switch (nfsstat3 status) {
1575  *      case NFS3_OK:
1576  *              READ3resok      resok;
1577  *      default:
1578  *              READ3resfail    resfail;
1579  *      };
1580  */
1581 static int decode_read3resok(struct xdr_stream *xdr,
1582                              struct nfs_pgio_res *result)
1583 {
1584         u32 eof, count, ocount, recvd;
1585         __be32 *p;
1586
1587         p = xdr_inline_decode(xdr, 4 + 4 + 4);
1588         if (unlikely(!p))
1589                 return -EIO;
1590         count = be32_to_cpup(p++);
1591         eof = be32_to_cpup(p++);
1592         ocount = be32_to_cpup(p++);
1593         if (unlikely(ocount != count))
1594                 goto out_mismatch;
1595         recvd = xdr_read_pages(xdr, count);
1596         if (unlikely(count > recvd))
1597                 goto out_cheating;
1598 out:
1599         result->eof = eof;
1600         result->count = count;
1601         return count;
1602 out_mismatch:
1603         dprintk("NFS: READ count doesn't match length of opaque: "
1604                 "count %u != ocount %u\n", count, ocount);
1605         return -EIO;
1606 out_cheating:
1607         dprintk("NFS: server cheating in read result: "
1608                 "count %u > recvd %u\n", count, recvd);
1609         count = recvd;
1610         eof = 0;
1611         goto out;
1612 }
1613
1614 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1615                                  void *data)
1616 {
1617         struct nfs_pgio_res *result = data;
1618         unsigned int pos;
1619         enum nfs_stat status;
1620         int error;
1621
1622         pos = xdr_stream_pos(xdr);
1623         error = decode_nfsstat3(xdr, &status);
1624         if (unlikely(error))
1625                 goto out;
1626         error = decode_post_op_attr(xdr, result->fattr);
1627         if (unlikely(error))
1628                 goto out;
1629         result->op_status = status;
1630         if (status != NFS3_OK)
1631                 goto out_status;
1632         result->replen = 4 + ((xdr_stream_pos(xdr) - pos) >> 2);
1633         error = decode_read3resok(xdr, result);
1634 out:
1635         return error;
1636 out_status:
1637         return nfs3_stat_to_errno(status);
1638 }
1639
1640 /*
1641  * 3.3.7  WRITE3res
1642  *
1643  *      enum stable_how {
1644  *              UNSTABLE  = 0,
1645  *              DATA_SYNC = 1,
1646  *              FILE_SYNC = 2
1647  *      };
1648  *
1649  *      struct WRITE3resok {
1650  *              wcc_data        file_wcc;
1651  *              count3          count;
1652  *              stable_how      committed;
1653  *              writeverf3      verf;
1654  *      };
1655  *
1656  *      struct WRITE3resfail {
1657  *              wcc_data        file_wcc;
1658  *      };
1659  *
1660  *      union WRITE3res switch (nfsstat3 status) {
1661  *      case NFS3_OK:
1662  *              WRITE3resok     resok;
1663  *      default:
1664  *              WRITE3resfail   resfail;
1665  *      };
1666  */
1667 static int decode_write3resok(struct xdr_stream *xdr,
1668                               struct nfs_pgio_res *result)
1669 {
1670         __be32 *p;
1671
1672         p = xdr_inline_decode(xdr, 4 + 4);
1673         if (unlikely(!p))
1674                 return -EIO;
1675         result->count = be32_to_cpup(p++);
1676         result->verf->committed = be32_to_cpup(p++);
1677         if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1678                 goto out_badvalue;
1679         if (decode_writeverf3(xdr, &result->verf->verifier))
1680                 return -EIO;
1681         return result->count;
1682 out_badvalue:
1683         dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1684         return -EIO;
1685 }
1686
1687 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1688                                   void *data)
1689 {
1690         struct nfs_pgio_res *result = data;
1691         enum nfs_stat status;
1692         int error;
1693
1694         error = decode_nfsstat3(xdr, &status);
1695         if (unlikely(error))
1696                 goto out;
1697         error = decode_wcc_data(xdr, result->fattr);
1698         if (unlikely(error))
1699                 goto out;
1700         result->op_status = status;
1701         if (status != NFS3_OK)
1702                 goto out_status;
1703         error = decode_write3resok(xdr, result);
1704 out:
1705         return error;
1706 out_status:
1707         return nfs3_stat_to_errno(status);
1708 }
1709
1710 /*
1711  * 3.3.8  CREATE3res
1712  *
1713  *      struct CREATE3resok {
1714  *              post_op_fh3     obj;
1715  *              post_op_attr    obj_attributes;
1716  *              wcc_data        dir_wcc;
1717  *      };
1718  *
1719  *      struct CREATE3resfail {
1720  *              wcc_data        dir_wcc;
1721  *      };
1722  *
1723  *      union CREATE3res switch (nfsstat3 status) {
1724  *      case NFS3_OK:
1725  *              CREATE3resok    resok;
1726  *      default:
1727  *              CREATE3resfail  resfail;
1728  *      };
1729  */
1730 static int decode_create3resok(struct xdr_stream *xdr,
1731                                struct nfs3_diropres *result)
1732 {
1733         int error;
1734
1735         error = decode_post_op_fh3(xdr, result->fh);
1736         if (unlikely(error))
1737                 goto out;
1738         error = decode_post_op_attr(xdr, result->fattr);
1739         if (unlikely(error))
1740                 goto out;
1741         /* The server isn't required to return a file handle.
1742          * If it didn't, force the client to perform a LOOKUP
1743          * to determine the correct file handle and attribute
1744          * values for the new object. */
1745         if (result->fh->size == 0)
1746                 result->fattr->valid = 0;
1747         error = decode_wcc_data(xdr, result->dir_attr);
1748 out:
1749         return error;
1750 }
1751
1752 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1753                                    struct xdr_stream *xdr,
1754                                    void *data)
1755 {
1756         struct nfs3_diropres *result = data;
1757         enum nfs_stat status;
1758         int error;
1759
1760         error = decode_nfsstat3(xdr, &status);
1761         if (unlikely(error))
1762                 goto out;
1763         if (status != NFS3_OK)
1764                 goto out_default;
1765         error = decode_create3resok(xdr, result);
1766 out:
1767         return error;
1768 out_default:
1769         error = decode_wcc_data(xdr, result->dir_attr);
1770         if (unlikely(error))
1771                 goto out;
1772         return nfs3_stat_to_errno(status);
1773 }
1774
1775 /*
1776  * 3.3.12  REMOVE3res
1777  *
1778  *      struct REMOVE3resok {
1779  *              wcc_data    dir_wcc;
1780  *      };
1781  *
1782  *      struct REMOVE3resfail {
1783  *              wcc_data    dir_wcc;
1784  *      };
1785  *
1786  *      union REMOVE3res switch (nfsstat3 status) {
1787  *      case NFS3_OK:
1788  *              REMOVE3resok   resok;
1789  *      default:
1790  *              REMOVE3resfail resfail;
1791  *      };
1792  */
1793 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1794                                    struct xdr_stream *xdr,
1795                                    void *data)
1796 {
1797         struct nfs_removeres *result = data;
1798         enum nfs_stat status;
1799         int error;
1800
1801         error = decode_nfsstat3(xdr, &status);
1802         if (unlikely(error))
1803                 goto out;
1804         error = decode_wcc_data(xdr, result->dir_attr);
1805         if (unlikely(error))
1806                 goto out;
1807         if (status != NFS3_OK)
1808                 goto out_status;
1809 out:
1810         return error;
1811 out_status:
1812         return nfs3_stat_to_errno(status);
1813 }
1814
1815 /*
1816  * 3.3.14  RENAME3res
1817  *
1818  *      struct RENAME3resok {
1819  *              wcc_data        fromdir_wcc;
1820  *              wcc_data        todir_wcc;
1821  *      };
1822  *
1823  *      struct RENAME3resfail {
1824  *              wcc_data        fromdir_wcc;
1825  *              wcc_data        todir_wcc;
1826  *      };
1827  *
1828  *      union RENAME3res switch (nfsstat3 status) {
1829  *      case NFS3_OK:
1830  *              RENAME3resok   resok;
1831  *      default:
1832  *              RENAME3resfail resfail;
1833  *      };
1834  */
1835 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1836                                    struct xdr_stream *xdr,
1837                                    void *data)
1838 {
1839         struct nfs_renameres *result = data;
1840         enum nfs_stat status;
1841         int error;
1842
1843         error = decode_nfsstat3(xdr, &status);
1844         if (unlikely(error))
1845                 goto out;
1846         error = decode_wcc_data(xdr, result->old_fattr);
1847         if (unlikely(error))
1848                 goto out;
1849         error = decode_wcc_data(xdr, result->new_fattr);
1850         if (unlikely(error))
1851                 goto out;
1852         if (status != NFS3_OK)
1853                 goto out_status;
1854 out:
1855         return error;
1856 out_status:
1857         return nfs3_stat_to_errno(status);
1858 }
1859
1860 /*
1861  * 3.3.15  LINK3res
1862  *
1863  *      struct LINK3resok {
1864  *              post_op_attr    file_attributes;
1865  *              wcc_data        linkdir_wcc;
1866  *      };
1867  *
1868  *      struct LINK3resfail {
1869  *              post_op_attr    file_attributes;
1870  *              wcc_data        linkdir_wcc;
1871  *      };
1872  *
1873  *      union LINK3res switch (nfsstat3 status) {
1874  *      case NFS3_OK:
1875  *              LINK3resok      resok;
1876  *      default:
1877  *              LINK3resfail    resfail;
1878  *      };
1879  */
1880 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1881                                  void *data)
1882 {
1883         struct nfs3_linkres *result = data;
1884         enum nfs_stat status;
1885         int error;
1886
1887         error = decode_nfsstat3(xdr, &status);
1888         if (unlikely(error))
1889                 goto out;
1890         error = decode_post_op_attr(xdr, result->fattr);
1891         if (unlikely(error))
1892                 goto out;
1893         error = decode_wcc_data(xdr, result->dir_attr);
1894         if (unlikely(error))
1895                 goto out;
1896         if (status != NFS3_OK)
1897                 goto out_status;
1898 out:
1899         return error;
1900 out_status:
1901         return nfs3_stat_to_errno(status);
1902 }
1903
1904 /**
1905  * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1906  *                      the local page cache
1907  * @xdr: XDR stream where entry resides
1908  * @entry: buffer to fill in with entry data
1909  * @plus: boolean indicating whether this should be a readdirplus entry
1910  *
1911  * Returns zero if successful, otherwise a negative errno value is
1912  * returned.
1913  *
1914  * This function is not invoked during READDIR reply decoding, but
1915  * rather whenever an application invokes the getdents(2) system call
1916  * on a directory already in our cache.
1917  *
1918  * 3.3.16  entry3
1919  *
1920  *      struct entry3 {
1921  *              fileid3         fileid;
1922  *              filename3       name;
1923  *              cookie3         cookie;
1924  *              fhandle3        filehandle;
1925  *              post_op_attr3   attributes;
1926  *              entry3          *nextentry;
1927  *      };
1928  *
1929  * 3.3.17  entryplus3
1930  *      struct entryplus3 {
1931  *              fileid3         fileid;
1932  *              filename3       name;
1933  *              cookie3         cookie;
1934  *              post_op_attr    name_attributes;
1935  *              post_op_fh3     name_handle;
1936  *              entryplus3      *nextentry;
1937  *      };
1938  */
1939 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1940                        bool plus)
1941 {
1942         struct nfs_entry old = *entry;
1943         __be32 *p;
1944         int error;
1945         u64 new_cookie;
1946
1947         p = xdr_inline_decode(xdr, 4);
1948         if (unlikely(!p))
1949                 return -EAGAIN;
1950         if (*p == xdr_zero) {
1951                 p = xdr_inline_decode(xdr, 4);
1952                 if (unlikely(!p))
1953                         return -EAGAIN;
1954                 if (*p == xdr_zero)
1955                         return -EAGAIN;
1956                 entry->eof = 1;
1957                 return -EBADCOOKIE;
1958         }
1959
1960         error = decode_fileid3(xdr, &entry->ino);
1961         if (unlikely(error))
1962                 return error;
1963
1964         error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1965         if (unlikely(error))
1966                 return error;
1967
1968         error = decode_cookie3(xdr, &new_cookie);
1969         if (unlikely(error))
1970                 return error;
1971
1972         entry->d_type = DT_UNKNOWN;
1973
1974         if (plus) {
1975                 entry->fattr->valid = 0;
1976                 error = decode_post_op_attr(xdr, entry->fattr);
1977                 if (unlikely(error))
1978                         return error;
1979                 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
1980                         entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
1981
1982                 if (entry->fattr->fileid != entry->ino) {
1983                         entry->fattr->mounted_on_fileid = entry->ino;
1984                         entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
1985                 }
1986
1987                 /* In fact, a post_op_fh3: */
1988                 p = xdr_inline_decode(xdr, 4);
1989                 if (unlikely(!p))
1990                         return -EAGAIN;
1991                 if (*p != xdr_zero) {
1992                         error = decode_nfs_fh3(xdr, entry->fh);
1993                         if (unlikely(error)) {
1994                                 if (error == -E2BIG)
1995                                         goto out_truncated;
1996                                 return error;
1997                         }
1998                 } else
1999                         zero_nfs_fh3(entry->fh);
2000         }
2001
2002         entry->prev_cookie = entry->cookie;
2003         entry->cookie = new_cookie;
2004
2005         return 0;
2006
2007 out_truncated:
2008         dprintk("NFS: directory entry contains invalid file handle\n");
2009         *entry = old;
2010         return -EAGAIN;
2011 }
2012
2013 /*
2014  * 3.3.16  READDIR3res
2015  *
2016  *      struct dirlist3 {
2017  *              entry3          *entries;
2018  *              bool            eof;
2019  *      };
2020  *
2021  *      struct READDIR3resok {
2022  *              post_op_attr    dir_attributes;
2023  *              cookieverf3     cookieverf;
2024  *              dirlist3        reply;
2025  *      };
2026  *
2027  *      struct READDIR3resfail {
2028  *              post_op_attr    dir_attributes;
2029  *      };
2030  *
2031  *      union READDIR3res switch (nfsstat3 status) {
2032  *      case NFS3_OK:
2033  *              READDIR3resok   resok;
2034  *      default:
2035  *              READDIR3resfail resfail;
2036  *      };
2037  *
2038  * Read the directory contents into the page cache, but otherwise
2039  * don't touch them.  The actual decoding is done by nfs3_decode_entry()
2040  * during subsequent nfs_readdir() calls.
2041  */
2042 static int decode_dirlist3(struct xdr_stream *xdr)
2043 {
2044         return xdr_read_pages(xdr, xdr->buf->page_len);
2045 }
2046
2047 static int decode_readdir3resok(struct xdr_stream *xdr,
2048                                 struct nfs3_readdirres *result)
2049 {
2050         int error;
2051
2052         error = decode_post_op_attr(xdr, result->dir_attr);
2053         if (unlikely(error))
2054                 goto out;
2055         /* XXX: do we need to check if result->verf != NULL ? */
2056         error = decode_cookieverf3(xdr, result->verf);
2057         if (unlikely(error))
2058                 goto out;
2059         error = decode_dirlist3(xdr);
2060 out:
2061         return error;
2062 }
2063
2064 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2065                                     struct xdr_stream *xdr,
2066                                     void *data)
2067 {
2068         struct nfs3_readdirres *result = data;
2069         enum nfs_stat status;
2070         int error;
2071
2072         error = decode_nfsstat3(xdr, &status);
2073         if (unlikely(error))
2074                 goto out;
2075         if (status != NFS3_OK)
2076                 goto out_default;
2077         error = decode_readdir3resok(xdr, result);
2078 out:
2079         return error;
2080 out_default:
2081         error = decode_post_op_attr(xdr, result->dir_attr);
2082         if (unlikely(error))
2083                 goto out;
2084         return nfs3_stat_to_errno(status);
2085 }
2086
2087 /*
2088  * 3.3.18  FSSTAT3res
2089  *
2090  *      struct FSSTAT3resok {
2091  *              post_op_attr    obj_attributes;
2092  *              size3           tbytes;
2093  *              size3           fbytes;
2094  *              size3           abytes;
2095  *              size3           tfiles;
2096  *              size3           ffiles;
2097  *              size3           afiles;
2098  *              uint32          invarsec;
2099  *      };
2100  *
2101  *      struct FSSTAT3resfail {
2102  *              post_op_attr    obj_attributes;
2103  *      };
2104  *
2105  *      union FSSTAT3res switch (nfsstat3 status) {
2106  *      case NFS3_OK:
2107  *              FSSTAT3resok    resok;
2108  *      default:
2109  *              FSSTAT3resfail  resfail;
2110  *      };
2111  */
2112 static int decode_fsstat3resok(struct xdr_stream *xdr,
2113                                struct nfs_fsstat *result)
2114 {
2115         __be32 *p;
2116
2117         p = xdr_inline_decode(xdr, 8 * 6 + 4);
2118         if (unlikely(!p))
2119                 return -EIO;
2120         p = xdr_decode_size3(p, &result->tbytes);
2121         p = xdr_decode_size3(p, &result->fbytes);
2122         p = xdr_decode_size3(p, &result->abytes);
2123         p = xdr_decode_size3(p, &result->tfiles);
2124         p = xdr_decode_size3(p, &result->ffiles);
2125         xdr_decode_size3(p, &result->afiles);
2126         /* ignore invarsec */
2127         return 0;
2128 }
2129
2130 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2131                                    struct xdr_stream *xdr,
2132                                    void *data)
2133 {
2134         struct nfs_fsstat *result = data;
2135         enum nfs_stat status;
2136         int error;
2137
2138         error = decode_nfsstat3(xdr, &status);
2139         if (unlikely(error))
2140                 goto out;
2141         error = decode_post_op_attr(xdr, result->fattr);
2142         if (unlikely(error))
2143                 goto out;
2144         if (status != NFS3_OK)
2145                 goto out_status;
2146         error = decode_fsstat3resok(xdr, result);
2147 out:
2148         return error;
2149 out_status:
2150         return nfs3_stat_to_errno(status);
2151 }
2152
2153 /*
2154  * 3.3.19  FSINFO3res
2155  *
2156  *      struct FSINFO3resok {
2157  *              post_op_attr    obj_attributes;
2158  *              uint32          rtmax;
2159  *              uint32          rtpref;
2160  *              uint32          rtmult;
2161  *              uint32          wtmax;
2162  *              uint32          wtpref;
2163  *              uint32          wtmult;
2164  *              uint32          dtpref;
2165  *              size3           maxfilesize;
2166  *              nfstime3        time_delta;
2167  *              uint32          properties;
2168  *      };
2169  *
2170  *      struct FSINFO3resfail {
2171  *              post_op_attr    obj_attributes;
2172  *      };
2173  *
2174  *      union FSINFO3res switch (nfsstat3 status) {
2175  *      case NFS3_OK:
2176  *              FSINFO3resok    resok;
2177  *      default:
2178  *              FSINFO3resfail  resfail;
2179  *      };
2180  */
2181 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2182                                struct nfs_fsinfo *result)
2183 {
2184         __be32 *p;
2185
2186         p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2187         if (unlikely(!p))
2188                 return -EIO;
2189         result->rtmax  = be32_to_cpup(p++);
2190         result->rtpref = be32_to_cpup(p++);
2191         result->rtmult = be32_to_cpup(p++);
2192         result->wtmax  = be32_to_cpup(p++);
2193         result->wtpref = be32_to_cpup(p++);
2194         result->wtmult = be32_to_cpup(p++);
2195         result->dtpref = be32_to_cpup(p++);
2196         p = xdr_decode_size3(p, &result->maxfilesize);
2197         xdr_decode_nfstime3(p, &result->time_delta);
2198
2199         /* ignore properties */
2200         result->lease_time = 0;
2201         return 0;
2202 }
2203
2204 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2205                                    struct xdr_stream *xdr,
2206                                    void *data)
2207 {
2208         struct nfs_fsinfo *result = data;
2209         enum nfs_stat status;
2210         int error;
2211
2212         error = decode_nfsstat3(xdr, &status);
2213         if (unlikely(error))
2214                 goto out;
2215         error = decode_post_op_attr(xdr, result->fattr);
2216         if (unlikely(error))
2217                 goto out;
2218         if (status != NFS3_OK)
2219                 goto out_status;
2220         error = decode_fsinfo3resok(xdr, result);
2221 out:
2222         return error;
2223 out_status:
2224         return nfs3_stat_to_errno(status);
2225 }
2226
2227 /*
2228  * 3.3.20  PATHCONF3res
2229  *
2230  *      struct PATHCONF3resok {
2231  *              post_op_attr    obj_attributes;
2232  *              uint32          linkmax;
2233  *              uint32          name_max;
2234  *              bool            no_trunc;
2235  *              bool            chown_restricted;
2236  *              bool            case_insensitive;
2237  *              bool            case_preserving;
2238  *      };
2239  *
2240  *      struct PATHCONF3resfail {
2241  *              post_op_attr    obj_attributes;
2242  *      };
2243  *
2244  *      union PATHCONF3res switch (nfsstat3 status) {
2245  *      case NFS3_OK:
2246  *              PATHCONF3resok  resok;
2247  *      default:
2248  *              PATHCONF3resfail resfail;
2249  *      };
2250  */
2251 static int decode_pathconf3resok(struct xdr_stream *xdr,
2252                                  struct nfs_pathconf *result)
2253 {
2254         __be32 *p;
2255
2256         p = xdr_inline_decode(xdr, 4 * 6);
2257         if (unlikely(!p))
2258                 return -EIO;
2259         result->max_link = be32_to_cpup(p++);
2260         result->max_namelen = be32_to_cpup(p);
2261         /* ignore remaining fields */
2262         return 0;
2263 }
2264
2265 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2266                                      struct xdr_stream *xdr,
2267                                      void *data)
2268 {
2269         struct nfs_pathconf *result = data;
2270         enum nfs_stat status;
2271         int error;
2272
2273         error = decode_nfsstat3(xdr, &status);
2274         if (unlikely(error))
2275                 goto out;
2276         error = decode_post_op_attr(xdr, result->fattr);
2277         if (unlikely(error))
2278                 goto out;
2279         if (status != NFS3_OK)
2280                 goto out_status;
2281         error = decode_pathconf3resok(xdr, result);
2282 out:
2283         return error;
2284 out_status:
2285         return nfs3_stat_to_errno(status);
2286 }
2287
2288 /*
2289  * 3.3.21  COMMIT3res
2290  *
2291  *      struct COMMIT3resok {
2292  *              wcc_data        file_wcc;
2293  *              writeverf3      verf;
2294  *      };
2295  *
2296  *      struct COMMIT3resfail {
2297  *              wcc_data        file_wcc;
2298  *      };
2299  *
2300  *      union COMMIT3res switch (nfsstat3 status) {
2301  *      case NFS3_OK:
2302  *              COMMIT3resok    resok;
2303  *      default:
2304  *              COMMIT3resfail  resfail;
2305  *      };
2306  */
2307 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2308                                    struct xdr_stream *xdr,
2309                                    void *data)
2310 {
2311         struct nfs_commitres *result = data;
2312         enum nfs_stat status;
2313         int error;
2314
2315         error = decode_nfsstat3(xdr, &status);
2316         if (unlikely(error))
2317                 goto out;
2318         error = decode_wcc_data(xdr, result->fattr);
2319         if (unlikely(error))
2320                 goto out;
2321         result->op_status = status;
2322         if (status != NFS3_OK)
2323                 goto out_status;
2324         error = decode_writeverf3(xdr, &result->verf->verifier);
2325 out:
2326         return error;
2327 out_status:
2328         return nfs3_stat_to_errno(status);
2329 }
2330
2331 #ifdef CONFIG_NFS_V3_ACL
2332
2333 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2334                                       struct nfs3_getaclres *result)
2335 {
2336         struct posix_acl **acl;
2337         unsigned int *aclcnt;
2338         size_t hdrlen;
2339         int error;
2340
2341         error = decode_post_op_attr(xdr, result->fattr);
2342         if (unlikely(error))
2343                 goto out;
2344         error = decode_uint32(xdr, &result->mask);
2345         if (unlikely(error))
2346                 goto out;
2347         error = -EINVAL;
2348         if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2349                 goto out;
2350
2351         hdrlen = xdr_stream_pos(xdr);
2352
2353         acl = NULL;
2354         if (result->mask & NFS_ACL)
2355                 acl = &result->acl_access;
2356         aclcnt = NULL;
2357         if (result->mask & NFS_ACLCNT)
2358                 aclcnt = &result->acl_access_count;
2359         error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2360         if (unlikely(error <= 0))
2361                 goto out;
2362
2363         acl = NULL;
2364         if (result->mask & NFS_DFACL)
2365                 acl = &result->acl_default;
2366         aclcnt = NULL;
2367         if (result->mask & NFS_DFACLCNT)
2368                 aclcnt = &result->acl_default_count;
2369         error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2370         if (unlikely(error <= 0))
2371                 return error;
2372         error = 0;
2373 out:
2374         return error;
2375 }
2376
2377 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2378                                    struct xdr_stream *xdr,
2379                                    void *result)
2380 {
2381         enum nfs_stat status;
2382         int error;
2383
2384         error = decode_nfsstat3(xdr, &status);
2385         if (unlikely(error))
2386                 goto out;
2387         if (status != NFS3_OK)
2388                 goto out_default;
2389         error = decode_getacl3resok(xdr, result);
2390 out:
2391         return error;
2392 out_default:
2393         return nfs3_stat_to_errno(status);
2394 }
2395
2396 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2397                                    struct xdr_stream *xdr,
2398                                    void *result)
2399 {
2400         enum nfs_stat status;
2401         int error;
2402
2403         error = decode_nfsstat3(xdr, &status);
2404         if (unlikely(error))
2405                 goto out;
2406         if (status != NFS3_OK)
2407                 goto out_default;
2408         error = decode_post_op_attr(xdr, result);
2409 out:
2410         return error;
2411 out_default:
2412         return nfs3_stat_to_errno(status);
2413 }
2414
2415 #endif  /* CONFIG_NFS_V3_ACL */
2416
2417
2418 /*
2419  * We need to translate between nfs status return values and
2420  * the local errno values which may not be the same.
2421  */
2422 static const struct {
2423         int stat;
2424         int errno;
2425 } nfs_errtbl[] = {
2426         { NFS_OK,               0               },
2427         { NFSERR_PERM,          -EPERM          },
2428         { NFSERR_NOENT,         -ENOENT         },
2429         { NFSERR_IO,            -errno_NFSERR_IO},
2430         { NFSERR_NXIO,          -ENXIO          },
2431 /*      { NFSERR_EAGAIN,        -EAGAIN         }, */
2432         { NFSERR_ACCES,         -EACCES         },
2433         { NFSERR_EXIST,         -EEXIST         },
2434         { NFSERR_XDEV,          -EXDEV          },
2435         { NFSERR_NODEV,         -ENODEV         },
2436         { NFSERR_NOTDIR,        -ENOTDIR        },
2437         { NFSERR_ISDIR,         -EISDIR         },
2438         { NFSERR_INVAL,         -EINVAL         },
2439         { NFSERR_FBIG,          -EFBIG          },
2440         { NFSERR_NOSPC,         -ENOSPC         },
2441         { NFSERR_ROFS,          -EROFS          },
2442         { NFSERR_MLINK,         -EMLINK         },
2443         { NFSERR_NAMETOOLONG,   -ENAMETOOLONG   },
2444         { NFSERR_NOTEMPTY,      -ENOTEMPTY      },
2445         { NFSERR_DQUOT,         -EDQUOT         },
2446         { NFSERR_STALE,         -ESTALE         },
2447         { NFSERR_REMOTE,        -EREMOTE        },
2448 #ifdef EWFLUSH
2449         { NFSERR_WFLUSH,        -EWFLUSH        },
2450 #endif
2451         { NFSERR_BADHANDLE,     -EBADHANDLE     },
2452         { NFSERR_NOT_SYNC,      -ENOTSYNC       },
2453         { NFSERR_BAD_COOKIE,    -EBADCOOKIE     },
2454         { NFSERR_NOTSUPP,       -ENOTSUPP       },
2455         { NFSERR_TOOSMALL,      -ETOOSMALL      },
2456         { NFSERR_SERVERFAULT,   -EREMOTEIO      },
2457         { NFSERR_BADTYPE,       -EBADTYPE       },
2458         { NFSERR_JUKEBOX,       -EJUKEBOX       },
2459         { -1,                   -EIO            }
2460 };
2461
2462 /**
2463  * nfs3_stat_to_errno - convert an NFS status code to a local errno
2464  * @status: NFS status code to convert
2465  *
2466  * Returns a local errno value, or -EIO if the NFS status code is
2467  * not recognized.  This function is used jointly by NFSv2 and NFSv3.
2468  */
2469 static int nfs3_stat_to_errno(enum nfs_stat status)
2470 {
2471         int i;
2472
2473         for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2474                 if (nfs_errtbl[i].stat == (int)status)
2475                         return nfs_errtbl[i].errno;
2476         }
2477         dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2478         return nfs_errtbl[i].errno;
2479 }
2480
2481
2482 #define PROC(proc, argtype, restype, timer)                             \
2483 [NFS3PROC_##proc] = {                                                   \
2484         .p_proc      = NFS3PROC_##proc,                                 \
2485         .p_encode    = nfs3_xdr_enc_##argtype##3args,                   \
2486         .p_decode    = nfs3_xdr_dec_##restype##3res,                    \
2487         .p_arglen    = NFS3_##argtype##args_sz,                         \
2488         .p_replen    = NFS3_##restype##res_sz,                          \
2489         .p_timer     = timer,                                           \
2490         .p_statidx   = NFS3PROC_##proc,                                 \
2491         .p_name      = #proc,                                           \
2492         }
2493
2494 const struct rpc_procinfo nfs3_procedures[] = {
2495         PROC(GETATTR,           getattr,        getattr,        1),
2496         PROC(SETATTR,           setattr,        setattr,        0),
2497         PROC(LOOKUP,            lookup,         lookup,         2),
2498         PROC(ACCESS,            access,         access,         1),
2499         PROC(READLINK,          readlink,       readlink,       3),
2500         PROC(READ,              read,           read,           3),
2501         PROC(WRITE,             write,          write,          4),
2502         PROC(CREATE,            create,         create,         0),
2503         PROC(MKDIR,             mkdir,          create,         0),
2504         PROC(SYMLINK,           symlink,        create,         0),
2505         PROC(MKNOD,             mknod,          create,         0),
2506         PROC(REMOVE,            remove,         remove,         0),
2507         PROC(RMDIR,             lookup,         setattr,        0),
2508         PROC(RENAME,            rename,         rename,         0),
2509         PROC(LINK,              link,           link,           0),
2510         PROC(READDIR,           readdir,        readdir,        3),
2511         PROC(READDIRPLUS,       readdirplus,    readdir,        3),
2512         PROC(FSSTAT,            getattr,        fsstat,         0),
2513         PROC(FSINFO,            getattr,        fsinfo,         0),
2514         PROC(PATHCONF,          getattr,        pathconf,       0),
2515         PROC(COMMIT,            commit,         commit,         5),
2516 };
2517
2518 static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)];
2519 const struct rpc_version nfs_version3 = {
2520         .number                 = 3,
2521         .nrprocs                = ARRAY_SIZE(nfs3_procedures),
2522         .procs                  = nfs3_procedures,
2523         .counts                 = nfs_version3_counts,
2524 };
2525
2526 #ifdef CONFIG_NFS_V3_ACL
2527 static const struct rpc_procinfo nfs3_acl_procedures[] = {
2528         [ACLPROC3_GETACL] = {
2529                 .p_proc = ACLPROC3_GETACL,
2530                 .p_encode = nfs3_xdr_enc_getacl3args,
2531                 .p_decode = nfs3_xdr_dec_getacl3res,
2532                 .p_arglen = ACL3_getaclargs_sz,
2533                 .p_replen = ACL3_getaclres_sz,
2534                 .p_timer = 1,
2535                 .p_name = "GETACL",
2536         },
2537         [ACLPROC3_SETACL] = {
2538                 .p_proc = ACLPROC3_SETACL,
2539                 .p_encode = nfs3_xdr_enc_setacl3args,
2540                 .p_decode = nfs3_xdr_dec_setacl3res,
2541                 .p_arglen = ACL3_setaclargs_sz,
2542                 .p_replen = ACL3_setaclres_sz,
2543                 .p_timer = 0,
2544                 .p_name = "SETACL",
2545         },
2546 };
2547
2548 static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)];
2549 const struct rpc_version nfsacl_version3 = {
2550         .number                 = 3,
2551         .nrprocs                = ARRAY_SIZE(nfs3_acl_procedures),
2552         .procs                  = nfs3_acl_procedures,
2553         .counts                 = nfs3_acl_counts,
2554 };
2555 #endif  /* CONFIG_NFS_V3_ACL */