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