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 timespec *timep)
 461 {
 462         *p++ = cpu_to_be32(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 timespec *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         struct timespec ts;
 538         u32 nbytes;
 539         __be32 *p;
 540
 541         /*
 542          * In order to make only a single xdr_reserve_space() call,
 543          * pre-compute the total number of bytes to be reserved.
 544          * Six boolean values, one for each set_foo field, are always
 545          * present in the encoded result, so start there.
 546          */
 547         nbytes = 6 * 4;
 548         if (attr->ia_valid & ATTR_MODE)
 549                 nbytes += 4;
 550         if (attr->ia_valid & ATTR_UID)
 551                 nbytes += 4;
 552         if (attr->ia_valid & ATTR_GID)
 553                 nbytes += 4;
 554         if (attr->ia_valid & ATTR_SIZE)
 555                 nbytes += 8;
 556         if (attr->ia_valid & ATTR_ATIME_SET)
 557                 nbytes += 8;
 558         if (attr->ia_valid & ATTR_MTIME_SET)
 559                 nbytes += 8;
 560         p = xdr_reserve_space(xdr, nbytes);
 561
 562         if (attr->ia_valid & ATTR_MODE) {
 563                 *p++ = xdr_one;
 564                 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
 565         } else
 566                 *p++ = xdr_zero;
 567
 568         if (attr->ia_valid & ATTR_UID) {
 569                 *p++ = xdr_one;
 570                 *p++ = cpu_to_be32(from_kuid_munged(userns, attr->ia_uid));
 571         } else
 572                 *p++ = xdr_zero;
 573
 574         if (attr->ia_valid & ATTR_GID) {
 575                 *p++ = xdr_one;
 576                 *p++ = cpu_to_be32(from_kgid_munged(userns, attr->ia_gid));
 577         } else
 578                 *p++ = xdr_zero;
 579
 580         if (attr->ia_valid & ATTR_SIZE) {
 581                 *p++ = xdr_one;
 582                 p = xdr_encode_hyper(p, (u64)attr->ia_size);
 583         } else
 584                 *p++ = xdr_zero;
 585
 586         if (attr->ia_valid & ATTR_ATIME_SET) {
 587                 struct timespec ts;
 588                 *p++ = xdr_two;
 589                 ts = timespec64_to_timespec(attr->ia_atime);
 590                 p = xdr_encode_nfstime3(p, &ts);
 591         } else if (attr->ia_valid & ATTR_ATIME) {
 592                 *p++ = xdr_one;
 593         } else
 594                 *p++ = xdr_zero;
 595
 596         if (attr->ia_valid & ATTR_MTIME_SET) {
 597                 *p++ = xdr_two;
 598                 ts = timespec64_to_timespec(attr->ia_mtime);
 599                 xdr_encode_nfstime3(p, &ts);
 600         } else if (attr->ia_valid & ATTR_MTIME) {
 601                 *p = xdr_one;
 602         } else
 603                 *p = xdr_zero;
 604 }
 605
 606 /*
 607  * fattr3
 608  *
 609  *      struct fattr3 {
 610  *              ftype3          type;
 611  *              mode3           mode;
 612  *              uint32          nlink;
 613  *              uid3            uid;
 614  *              gid3            gid;
 615  *              size3           size;
 616  *              size3           used;
 617  *              specdata3       rdev;
 618  *              uint64          fsid;
 619  *              fileid3         fileid;
 620  *              nfstime3        atime;
 621  *              nfstime3        mtime;
 622  *              nfstime3        ctime;
 623  *      };
 624  */
 625 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr,
 626                 struct user_namespace *userns)
 627 {
 628         umode_t fmode;
 629         __be32 *p;
 630
 631         p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
 632         if (unlikely(!p))
 633                 return -EIO;
 634
 635         p = xdr_decode_ftype3(p, &fmode);
 636
 637         fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
 638         fattr->nlink = be32_to_cpup(p++);
 639         fattr->uid = make_kuid(userns, be32_to_cpup(p++));
 640         if (!uid_valid(fattr->uid))
 641                 goto out_uid;
 642         fattr->gid = make_kgid(userns, be32_to_cpup(p++));
 643         if (!gid_valid(fattr->gid))
 644                 goto out_gid;
 645
 646         p = xdr_decode_size3(p, &fattr->size);
 647         p = xdr_decode_size3(p, &fattr->du.nfs3.used);
 648         p = xdr_decode_specdata3(p, &fattr->rdev);
 649
 650         p = xdr_decode_hyper(p, &fattr->fsid.major);
 651         fattr->fsid.minor = 0;
 652
 653         p = xdr_decode_fileid3(p, &fattr->fileid);
 654         p = xdr_decode_nfstime3(p, &fattr->atime);
 655         p = xdr_decode_nfstime3(p, &fattr->mtime);
 656         xdr_decode_nfstime3(p, &fattr->ctime);
 657         fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
 658
 659         fattr->valid |= NFS_ATTR_FATTR_V3;
 660         return 0;
 661 out_uid:
 662         dprintk("NFS: returned invalid uid\n");
 663         return -EINVAL;
 664 out_gid:
 665         dprintk("NFS: returned invalid gid\n");
 666         return -EINVAL;
 667 }
 668
 669 /*
 670  * post_op_attr
 671  *
 672  *      union post_op_attr switch (bool attributes_follow) {
 673  *      case TRUE:
 674  *              fattr3  attributes;
 675  *      case FALSE:
 676  *              void;
 677  *      };
 678  */
 679 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
 680                 struct user_namespace *userns)
 681 {
 682         __be32 *p;
 683
 684         p = xdr_inline_decode(xdr, 4);
 685         if (unlikely(!p))
 686                 return -EIO;
 687         if (*p != xdr_zero)
 688                 return decode_fattr3(xdr, fattr, userns);
 689         return 0;
 690 }
 691
 692 /*
 693  * wcc_attr
 694  *      struct wcc_attr {
 695  *              size3           size;
 696  *              nfstime3        mtime;
 697  *              nfstime3        ctime;
 698  *      };
 699  */
 700 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 701 {
 702         __be32 *p;
 703
 704         p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
 705         if (unlikely(!p))
 706                 return -EIO;
 707
 708         fattr->valid |= NFS_ATTR_FATTR_PRESIZE
 709                 | NFS_ATTR_FATTR_PRECHANGE
 710                 | NFS_ATTR_FATTR_PREMTIME
 711                 | NFS_ATTR_FATTR_PRECTIME;
 712
 713         p = xdr_decode_size3(p, &fattr->pre_size);
 714         p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
 715         xdr_decode_nfstime3(p, &fattr->pre_ctime);
 716         fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
 717
 718         return 0;
 719 }
 720
 721 /*
 722  * pre_op_attr
 723  *      union pre_op_attr switch (bool attributes_follow) {
 724  *      case TRUE:
 725  *              wcc_attr        attributes;
 726  *      case FALSE:
 727  *              void;
 728  *      };
 729  *
 730  * wcc_data
 731  *
 732  *      struct wcc_data {
 733  *              pre_op_attr     before;
 734  *              post_op_attr    after;
 735  *      };
 736  */
 737 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 738 {
 739         __be32 *p;
 740
 741         p = xdr_inline_decode(xdr, 4);
 742         if (unlikely(!p))
 743                 return -EIO;
 744         if (*p != xdr_zero)
 745                 return decode_wcc_attr(xdr, fattr);
 746         return 0;
 747 }
 748
 749 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr,
 750                 struct user_namespace *userns)
 751 {
 752         int error;
 753
 754         error = decode_pre_op_attr(xdr, fattr);
 755         if (unlikely(error))
 756                 goto out;
 757         error = decode_post_op_attr(xdr, fattr, userns);
 758 out:
 759         return error;
 760 }
 761
 762 /*
 763  * post_op_fh3
 764  *
 765  *      union post_op_fh3 switch (bool handle_follows) {
 766  *      case TRUE:
 767  *              nfs_fh3  handle;
 768  *      case FALSE:
 769  *              void;
 770  *      };
 771  */
 772 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
 773 {
 774         __be32 *p = xdr_inline_decode(xdr, 4);
 775         if (unlikely(!p))
 776                 return -EIO;
 777         if (*p != xdr_zero)
 778                 return decode_nfs_fh3(xdr, fh);
 779         zero_nfs_fh3(fh);
 780         return 0;
 781 }
 782
 783 /*
 784  * diropargs3
 785  *
 786  *      struct diropargs3 {
 787  *              nfs_fh3         dir;
 788  *              filename3       name;
 789  *      };
 790  */
 791 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
 792                               const char *name, u32 length)
 793 {
 794         encode_nfs_fh3(xdr, fh);
 795         encode_filename3(xdr, name, length);
 796 }
 797
 798
 799 /*
 800  * NFSv3 XDR encode functions
 801  *
 802  * NFSv3 argument types are defined in section 3.3 of RFC 1813:
 803  * "NFS Version 3 Protocol Specification".
 804  */
 805
 806 /*
 807  * 3.3.1  GETATTR3args
 808  *
 809  *      struct GETATTR3args {
 810  *              nfs_fh3  object;
 811  *      };
 812  */
 813 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
 814                                       struct xdr_stream *xdr,
 815                                       const void *data)
 816 {
 817         const struct nfs_fh *fh = data;
 818
 819         encode_nfs_fh3(xdr, fh);
 820 }
 821
 822 /*
 823  * 3.3.2  SETATTR3args
 824  *
 825  *      union sattrguard3 switch (bool check) {
 826  *      case TRUE:
 827  *              nfstime3  obj_ctime;
 828  *      case FALSE:
 829  *              void;
 830  *      };
 831  *
 832  *      struct SETATTR3args {
 833  *              nfs_fh3         object;
 834  *              sattr3          new_attributes;
 835  *              sattrguard3     guard;
 836  *      };
 837  */
 838 static void encode_sattrguard3(struct xdr_stream *xdr,
 839                                const struct nfs3_sattrargs *args)
 840 {
 841         __be32 *p;
 842
 843         if (args->guard) {
 844                 p = xdr_reserve_space(xdr, 4 + 8);
 845                 *p++ = xdr_one;
 846                 xdr_encode_nfstime3(p, &args->guardtime);
 847         } else {
 848                 p = xdr_reserve_space(xdr, 4);
 849                 *p = xdr_zero;
 850         }
 851 }
 852
 853 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
 854                                       struct xdr_stream *xdr,
 855                                       const void *data)
 856 {
 857         const struct nfs3_sattrargs *args = data;
 858         encode_nfs_fh3(xdr, args->fh);
 859         encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req));
 860         encode_sattrguard3(xdr, args);
 861 }
 862
 863 /*
 864  * 3.3.3  LOOKUP3args
 865  *
 866  *      struct LOOKUP3args {
 867  *              diropargs3  what;
 868  *      };
 869  */
 870 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
 871                                      struct xdr_stream *xdr,
 872                                      const void *data)
 873 {
 874         const struct nfs3_diropargs *args = data;
 875
 876         encode_diropargs3(xdr, args->fh, args->name, args->len);
 877 }
 878
 879 /*
 880  * 3.3.4  ACCESS3args
 881  *
 882  *      struct ACCESS3args {
 883  *              nfs_fh3         object;
 884  *              uint32          access;
 885  *      };
 886  */
 887 static void encode_access3args(struct xdr_stream *xdr,
 888                                const struct nfs3_accessargs *args)
 889 {
 890         encode_nfs_fh3(xdr, args->fh);
 891         encode_uint32(xdr, args->access);
 892 }
 893
 894 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
 895                                      struct xdr_stream *xdr,
 896                                      const void *data)
 897 {
 898         const struct nfs3_accessargs *args = data;
 899
 900         encode_access3args(xdr, args);
 901 }
 902
 903 /*
 904  * 3.3.5  READLINK3args
 905  *
 906  *      struct READLINK3args {
 907  *              nfs_fh3 symlink;
 908  *      };
 909  */
 910 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
 911                                        struct xdr_stream *xdr,
 912                                        const void *data)
 913 {
 914         const struct nfs3_readlinkargs *args = data;
 915
 916         encode_nfs_fh3(xdr, args->fh);
 917         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
 918                                 args->pglen, NFS3_readlinkres_sz);
 919 }
 920
 921 /*
 922  * 3.3.6  READ3args
 923  *
 924  *      struct READ3args {
 925  *              nfs_fh3         file;
 926  *              offset3         offset;
 927  *              count3          count;
 928  *      };
 929  */
 930 static void encode_read3args(struct xdr_stream *xdr,
 931                              const struct nfs_pgio_args *args)
 932 {
 933         __be32 *p;
 934
 935         encode_nfs_fh3(xdr, args->fh);
 936
 937         p = xdr_reserve_space(xdr, 8 + 4);
 938         p = xdr_encode_hyper(p, args->offset);
 939         *p = cpu_to_be32(args->count);
 940 }
 941
 942 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
 943                                    struct xdr_stream *xdr,
 944                                    const void *data)
 945 {
 946         const struct nfs_pgio_args *args = data;
 947         unsigned int replen = args->replen ? args->replen : NFS3_readres_sz;
 948
 949         encode_read3args(xdr, args);
 950         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
 951                                 args->count, replen);
 952         req->rq_rcv_buf.flags |= XDRBUF_READ;
 953 }
 954
 955 /*
 956  * 3.3.7  WRITE3args
 957  *
 958  *      enum stable_how {
 959  *              UNSTABLE  = 0,
 960  *              DATA_SYNC = 1,
 961  *              FILE_SYNC = 2
 962  *      };
 963  *
 964  *      struct WRITE3args {
 965  *              nfs_fh3         file;
 966  *              offset3         offset;
 967  *              count3          count;
 968  *              stable_how      stable;
 969  *              opaque          data<>;
 970  *      };
 971  */
 972 static void encode_write3args(struct xdr_stream *xdr,
 973                               const struct nfs_pgio_args *args)
 974 {
 975         __be32 *p;
 976
 977         encode_nfs_fh3(xdr, args->fh);
 978
 979         p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
 980         p = xdr_encode_hyper(p, args->offset);
 981         *p++ = cpu_to_be32(args->count);
 982         *p++ = cpu_to_be32(args->stable);
 983         *p = cpu_to_be32(args->count);
 984         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
 985 }
 986
 987 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
 988                                     struct xdr_stream *xdr,
 989                                     const void *data)
 990 {
 991         const struct nfs_pgio_args *args = data;
 992
 993         encode_write3args(xdr, args);
 994         xdr->buf->flags |= XDRBUF_WRITE;
 995 }
 996
 997 /*
 998  * 3.3.8  CREATE3args
 999  *
1000  *      enum createmode3 {
1001  *              UNCHECKED = 0,
1002  *              GUARDED   = 1,
1003  *              EXCLUSIVE = 2
1004  *      };
1005  *
1006  *      union createhow3 switch (createmode3 mode) {
1007  *      case UNCHECKED:
1008  *      case GUARDED:
1009  *              sattr3       obj_attributes;
1010  *      case EXCLUSIVE:
1011  *              createverf3  verf;
1012  *      };
1013  *
1014  *      struct CREATE3args {
1015  *              diropargs3      where;
1016  *              createhow3      how;
1017  *      };
1018  */
1019 static void encode_createhow3(struct xdr_stream *xdr,
1020                               const struct nfs3_createargs *args,
1021                               struct user_namespace *userns)
1022 {
1023         encode_uint32(xdr, args->createmode);
1024         switch (args->createmode) {
1025         case NFS3_CREATE_UNCHECKED:
1026         case NFS3_CREATE_GUARDED:
1027                 encode_sattr3(xdr, args->sattr, userns);
1028                 break;
1029         case NFS3_CREATE_EXCLUSIVE:
1030                 encode_createverf3(xdr, args->verifier);
1031                 break;
1032         default:
1033                 BUG();
1034         }
1035 }
1036
1037 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1038                                      struct xdr_stream *xdr,
1039                                      const void *data)
1040 {
1041         const struct nfs3_createargs *args = data;
1042
1043         encode_diropargs3(xdr, args->fh, args->name, args->len);
1044         encode_createhow3(xdr, args, rpc_rqst_userns(req));
1045 }
1046
1047 /*
1048  * 3.3.9  MKDIR3args
1049  *
1050  *      struct MKDIR3args {
1051  *              diropargs3      where;
1052  *              sattr3          attributes;
1053  *      };
1054  */
1055 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1056                                     struct xdr_stream *xdr,
1057                                     const void *data)
1058 {
1059         const struct nfs3_mkdirargs *args = data;
1060
1061         encode_diropargs3(xdr, args->fh, args->name, args->len);
1062         encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req));
1063 }
1064
1065 /*
1066  * 3.3.10  SYMLINK3args
1067  *
1068  *      struct symlinkdata3 {
1069  *              sattr3          symlink_attributes;
1070  *              nfspath3        symlink_data;
1071  *      };
1072  *
1073  *      struct SYMLINK3args {
1074  *              diropargs3      where;
1075  *              symlinkdata3    symlink;
1076  *      };
1077  */
1078 static void encode_symlinkdata3(struct xdr_stream *xdr,
1079                                 const void *data,
1080                                 struct user_namespace *userns)
1081 {
1082         const struct nfs3_symlinkargs *args = data;
1083
1084         encode_sattr3(xdr, args->sattr, userns);
1085         encode_nfspath3(xdr, args->pages, args->pathlen);
1086 }
1087
1088 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1089                                       struct xdr_stream *xdr,
1090                                       const void *data)
1091 {
1092         const struct nfs3_symlinkargs *args = data;
1093
1094         encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1095         encode_symlinkdata3(xdr, args, rpc_rqst_userns(req));
1096         xdr->buf->flags |= XDRBUF_WRITE;
1097 }
1098
1099 /*
1100  * 3.3.11  MKNOD3args
1101  *
1102  *      struct devicedata3 {
1103  *              sattr3          dev_attributes;
1104  *              specdata3       spec;
1105  *      };
1106  *
1107  *      union mknoddata3 switch (ftype3 type) {
1108  *      case NF3CHR:
1109  *      case NF3BLK:
1110  *              devicedata3     device;
1111  *      case NF3SOCK:
1112  *      case NF3FIFO:
1113  *              sattr3          pipe_attributes;
1114  *      default:
1115  *              void;
1116  *      };
1117  *
1118  *      struct MKNOD3args {
1119  *              diropargs3      where;
1120  *              mknoddata3      what;
1121  *      };
1122  */
1123 static void encode_devicedata3(struct xdr_stream *xdr,
1124                                const struct nfs3_mknodargs *args,
1125                                struct user_namespace *userns)
1126 {
1127         encode_sattr3(xdr, args->sattr, userns);
1128         encode_specdata3(xdr, args->rdev);
1129 }
1130
1131 static void encode_mknoddata3(struct xdr_stream *xdr,
1132                               const struct nfs3_mknodargs *args,
1133                               struct user_namespace *userns)
1134 {
1135         encode_ftype3(xdr, args->type);
1136         switch (args->type) {
1137         case NF3CHR:
1138         case NF3BLK:
1139                 encode_devicedata3(xdr, args, userns);
1140                 break;
1141         case NF3SOCK:
1142         case NF3FIFO:
1143                 encode_sattr3(xdr, args->sattr, userns);
1144                 break;
1145         case NF3REG:
1146         case NF3DIR:
1147                 break;
1148         default:
1149                 BUG();
1150         }
1151 }
1152
1153 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1154                                     struct xdr_stream *xdr,
1155                                     const void *data)
1156 {
1157         const struct nfs3_mknodargs *args = data;
1158
1159         encode_diropargs3(xdr, args->fh, args->name, args->len);
1160         encode_mknoddata3(xdr, args, rpc_rqst_userns(req));
1161 }
1162
1163 /*
1164  * 3.3.12  REMOVE3args
1165  *
1166  *      struct REMOVE3args {
1167  *              diropargs3  object;
1168  *      };
1169  */
1170 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1171                                      struct xdr_stream *xdr,
1172                                      const void *data)
1173 {
1174         const struct nfs_removeargs *args = data;
1175
1176         encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1177 }
1178
1179 /*
1180  * 3.3.14  RENAME3args
1181  *
1182  *      struct RENAME3args {
1183  *              diropargs3      from;
1184  *              diropargs3      to;
1185  *      };
1186  */
1187 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1188                                      struct xdr_stream *xdr,
1189                                      const void *data)
1190 {
1191         const struct nfs_renameargs *args = data;
1192         const struct qstr *old = args->old_name;
1193         const struct qstr *new = args->new_name;
1194
1195         encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1196         encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1197 }
1198
1199 /*
1200  * 3.3.15  LINK3args
1201  *
1202  *      struct LINK3args {
1203  *              nfs_fh3         file;
1204  *              diropargs3      link;
1205  *      };
1206  */
1207 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1208                                    struct xdr_stream *xdr,
1209                                    const void *data)
1210 {
1211         const struct nfs3_linkargs *args = data;
1212
1213         encode_nfs_fh3(xdr, args->fromfh);
1214         encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1215 }
1216
1217 /*
1218  * 3.3.16  READDIR3args
1219  *
1220  *      struct READDIR3args {
1221  *              nfs_fh3         dir;
1222  *              cookie3         cookie;
1223  *              cookieverf3     cookieverf;
1224  *              count3          count;
1225  *      };
1226  */
1227 static void encode_readdir3args(struct xdr_stream *xdr,
1228                                 const struct nfs3_readdirargs *args)
1229 {
1230         __be32 *p;
1231
1232         encode_nfs_fh3(xdr, args->fh);
1233
1234         p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1235         p = xdr_encode_cookie3(p, args->cookie);
1236         p = xdr_encode_cookieverf3(p, args->verf);
1237         *p = cpu_to_be32(args->count);
1238 }
1239
1240 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1241                                       struct xdr_stream *xdr,
1242                                       const void *data)
1243 {
1244         const struct nfs3_readdirargs *args = data;
1245
1246         encode_readdir3args(xdr, args);
1247         rpc_prepare_reply_pages(req, args->pages, 0,
1248                                 args->count, NFS3_readdirres_sz);
1249 }
1250
1251 /*
1252  * 3.3.17  READDIRPLUS3args
1253  *
1254  *      struct READDIRPLUS3args {
1255  *              nfs_fh3         dir;
1256  *              cookie3         cookie;
1257  *              cookieverf3     cookieverf;
1258  *              count3          dircount;
1259  *              count3          maxcount;
1260  *      };
1261  */
1262 static void encode_readdirplus3args(struct xdr_stream *xdr,
1263                                     const struct nfs3_readdirargs *args)
1264 {
1265         __be32 *p;
1266
1267         encode_nfs_fh3(xdr, args->fh);
1268
1269         p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1270         p = xdr_encode_cookie3(p, args->cookie);
1271         p = xdr_encode_cookieverf3(p, args->verf);
1272
1273         /*
1274          * readdirplus: need dircount + buffer size.
1275          * We just make sure we make dircount big enough
1276          */
1277         *p++ = cpu_to_be32(args->count >> 3);
1278
1279         *p = cpu_to_be32(args->count);
1280 }
1281
1282 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1283                                           struct xdr_stream *xdr,
1284                                           const void *data)
1285 {
1286         const struct nfs3_readdirargs *args = data;
1287
1288         encode_readdirplus3args(xdr, args);
1289         rpc_prepare_reply_pages(req, args->pages, 0,
1290                                 args->count, NFS3_readdirres_sz);
1291 }
1292
1293 /*
1294  * 3.3.21  COMMIT3args
1295  *
1296  *      struct COMMIT3args {
1297  *              nfs_fh3         file;
1298  *              offset3         offset;
1299  *              count3          count;
1300  *      };
1301  */
1302 static void encode_commit3args(struct xdr_stream *xdr,
1303                                const struct nfs_commitargs *args)
1304 {
1305         __be32 *p;
1306
1307         encode_nfs_fh3(xdr, args->fh);
1308
1309         p = xdr_reserve_space(xdr, 8 + 4);
1310         p = xdr_encode_hyper(p, args->offset);
1311         *p = cpu_to_be32(args->count);
1312 }
1313
1314 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1315                                      struct xdr_stream *xdr,
1316                                      const void *data)
1317 {
1318         const struct nfs_commitargs *args = data;
1319
1320         encode_commit3args(xdr, args);
1321 }
1322
1323 #ifdef CONFIG_NFS_V3_ACL
1324
1325 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1326                                      struct xdr_stream *xdr,
1327                                      const void *data)
1328 {
1329         const struct nfs3_getaclargs *args = data;
1330
1331         encode_nfs_fh3(xdr, args->fh);
1332         encode_uint32(xdr, args->mask);
1333         if (args->mask & (NFS_ACL | NFS_DFACL)) {
1334                 rpc_prepare_reply_pages(req, args->pages, 0,
1335                                         NFSACL_MAXPAGES << PAGE_SHIFT,
1336                                         ACL3_getaclres_sz);
1337                 req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES;
1338         }
1339 }
1340
1341 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1342                                      struct xdr_stream *xdr,
1343                                      const void *data)
1344 {
1345         const struct nfs3_setaclargs *args = data;
1346         unsigned int base;
1347         int error;
1348
1349         encode_nfs_fh3(xdr, NFS_FH(args->inode));
1350         encode_uint32(xdr, args->mask);
1351
1352         base = req->rq_slen;
1353         if (args->npages != 0)
1354                 xdr_write_pages(xdr, args->pages, 0, args->len);
1355         else
1356                 xdr_reserve_space(xdr, args->len);
1357
1358         error = nfsacl_encode(xdr->buf, base, args->inode,
1359                             (args->mask & NFS_ACL) ?
1360                             args->acl_access : NULL, 1, 0);
1361         /* FIXME: this is just broken */
1362         BUG_ON(error < 0);
1363         error = nfsacl_encode(xdr->buf, base + error, args->inode,
1364                             (args->mask & NFS_DFACL) ?
1365                             args->acl_default : NULL, 1,
1366                             NFS_ACL_DEFAULT);
1367         BUG_ON(error < 0);
1368 }
1369
1370 #endif  /* CONFIG_NFS_V3_ACL */
1371
1372 /*
1373  * NFSv3 XDR decode functions
1374  *
1375  * NFSv3 result types are defined in section 3.3 of RFC 1813:
1376  * "NFS Version 3 Protocol Specification".
1377  */
1378
1379 /*
1380  * 3.3.1  GETATTR3res
1381  *
1382  *      struct GETATTR3resok {
1383  *              fattr3          obj_attributes;
1384  *      };
1385  *
1386  *      union GETATTR3res switch (nfsstat3 status) {
1387  *      case NFS3_OK:
1388  *              GETATTR3resok  resok;
1389  *      default:
1390  *              void;
1391  *      };
1392  */
1393 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1394                                     struct xdr_stream *xdr,
1395                                     void *result)
1396 {
1397         enum nfs_stat status;
1398         int error;
1399
1400         error = decode_nfsstat3(xdr, &status);
1401         if (unlikely(error))
1402                 goto out;
1403         if (status != NFS3_OK)
1404                 goto out_default;
1405         error = decode_fattr3(xdr, result, rpc_rqst_userns(req));
1406 out:
1407         return error;
1408 out_default:
1409         return nfs3_stat_to_errno(status);
1410 }
1411
1412 /*
1413  * 3.3.2  SETATTR3res
1414  *
1415  *      struct SETATTR3resok {
1416  *              wcc_data  obj_wcc;
1417  *      };
1418  *
1419  *      struct SETATTR3resfail {
1420  *              wcc_data  obj_wcc;
1421  *      };
1422  *
1423  *      union SETATTR3res switch (nfsstat3 status) {
1424  *      case NFS3_OK:
1425  *              SETATTR3resok   resok;
1426  *      default:
1427  *              SETATTR3resfail resfail;
1428  *      };
1429  */
1430 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1431                                     struct xdr_stream *xdr,
1432                                     void *result)
1433 {
1434         enum nfs_stat status;
1435         int error;
1436
1437         error = decode_nfsstat3(xdr, &status);
1438         if (unlikely(error))
1439                 goto out;
1440         error = decode_wcc_data(xdr, result, rpc_rqst_userns(req));
1441         if (unlikely(error))
1442                 goto out;
1443         if (status != NFS3_OK)
1444                 goto out_status;
1445 out:
1446         return error;
1447 out_status:
1448         return nfs3_stat_to_errno(status);
1449 }
1450
1451 /*
1452  * 3.3.3  LOOKUP3res
1453  *
1454  *      struct LOOKUP3resok {
1455  *              nfs_fh3         object;
1456  *              post_op_attr    obj_attributes;
1457  *              post_op_attr    dir_attributes;
1458  *      };
1459  *
1460  *      struct LOOKUP3resfail {
1461  *              post_op_attr    dir_attributes;
1462  *      };
1463  *
1464  *      union LOOKUP3res switch (nfsstat3 status) {
1465  *      case NFS3_OK:
1466  *              LOOKUP3resok    resok;
1467  *      default:
1468  *              LOOKUP3resfail  resfail;
1469  *      };
1470  */
1471 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1472                                    struct xdr_stream *xdr,
1473                                    void *data)
1474 {
1475         struct user_namespace *userns = rpc_rqst_userns(req);
1476         struct nfs3_diropres *result = data;
1477         enum nfs_stat status;
1478         int error;
1479
1480         error = decode_nfsstat3(xdr, &status);
1481         if (unlikely(error))
1482                 goto out;
1483         if (status != NFS3_OK)
1484                 goto out_default;
1485         error = decode_nfs_fh3(xdr, result->fh);
1486         if (unlikely(error))
1487                 goto out;
1488         error = decode_post_op_attr(xdr, result->fattr, userns);
1489         if (unlikely(error))
1490                 goto out;
1491         error = decode_post_op_attr(xdr, result->dir_attr, userns);
1492 out:
1493         return error;
1494 out_default:
1495         error = decode_post_op_attr(xdr, result->dir_attr, userns);
1496         if (unlikely(error))
1497                 goto out;
1498         return nfs3_stat_to_errno(status);
1499 }
1500
1501 /*
1502  * 3.3.4  ACCESS3res
1503  *
1504  *      struct ACCESS3resok {
1505  *              post_op_attr    obj_attributes;
1506  *              uint32          access;
1507  *      };
1508  *
1509  *      struct ACCESS3resfail {
1510  *              post_op_attr    obj_attributes;
1511  *      };
1512  *
1513  *      union ACCESS3res switch (nfsstat3 status) {
1514  *      case NFS3_OK:
1515  *              ACCESS3resok    resok;
1516  *      default:
1517  *              ACCESS3resfail  resfail;
1518  *      };
1519  */
1520 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1521                                    struct xdr_stream *xdr,
1522                                    void *data)
1523 {
1524         struct nfs3_accessres *result = data;
1525         enum nfs_stat status;
1526         int error;
1527
1528         error = decode_nfsstat3(xdr, &status);
1529         if (unlikely(error))
1530                 goto out;
1531         error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
1532         if (unlikely(error))
1533                 goto out;
1534         if (status != NFS3_OK)
1535                 goto out_default;
1536         error = decode_uint32(xdr, &result->access);
1537 out:
1538         return error;
1539 out_default:
1540         return nfs3_stat_to_errno(status);
1541 }
1542
1543 /*
1544  * 3.3.5  READLINK3res
1545  *
1546  *      struct READLINK3resok {
1547  *              post_op_attr    symlink_attributes;
1548  *              nfspath3        data;
1549  *      };
1550  *
1551  *      struct READLINK3resfail {
1552  *              post_op_attr    symlink_attributes;
1553  *      };
1554  *
1555  *      union READLINK3res switch (nfsstat3 status) {
1556  *      case NFS3_OK:
1557  *              READLINK3resok  resok;
1558  *      default:
1559  *              READLINK3resfail resfail;
1560  *      };
1561  */
1562 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1563                                      struct xdr_stream *xdr,
1564                                      void *result)
1565 {
1566         enum nfs_stat status;
1567         int error;
1568
1569         error = decode_nfsstat3(xdr, &status);
1570         if (unlikely(error))
1571                 goto out;
1572         error = decode_post_op_attr(xdr, result, rpc_rqst_userns(req));
1573         if (unlikely(error))
1574                 goto out;
1575         if (status != NFS3_OK)
1576                 goto out_default;
1577         error = decode_nfspath3(xdr);
1578 out:
1579         return error;
1580 out_default:
1581         return nfs3_stat_to_errno(status);
1582 }
1583
1584 /*
1585  * 3.3.6  READ3res
1586  *
1587  *      struct READ3resok {
1588  *              post_op_attr    file_attributes;
1589  *              count3          count;
1590  *              bool            eof;
1591  *              opaque          data<>;
1592  *      };
1593  *
1594  *      struct READ3resfail {
1595  *              post_op_attr    file_attributes;
1596  *      };
1597  *
1598  *      union READ3res switch (nfsstat3 status) {
1599  *      case NFS3_OK:
1600  *              READ3resok      resok;
1601  *      default:
1602  *              READ3resfail    resfail;
1603  *      };
1604  */
1605 static int decode_read3resok(struct xdr_stream *xdr,
1606                              struct nfs_pgio_res *result)
1607 {
1608         u32 eof, count, ocount, recvd;
1609         __be32 *p;
1610
1611         p = xdr_inline_decode(xdr, 4 + 4 + 4);
1612         if (unlikely(!p))
1613                 return -EIO;
1614         count = be32_to_cpup(p++);
1615         eof = be32_to_cpup(p++);
1616         ocount = be32_to_cpup(p++);
1617         if (unlikely(ocount != count))
1618                 goto out_mismatch;
1619         recvd = xdr_read_pages(xdr, count);
1620         if (unlikely(count > recvd))
1621                 goto out_cheating;
1622 out:
1623         result->eof = eof;
1624         result->count = count;
1625         return count;
1626 out_mismatch:
1627         dprintk("NFS: READ count doesn't match length of opaque: "
1628                 "count %u != ocount %u\n", count, ocount);
1629         return -EIO;
1630 out_cheating:
1631         dprintk("NFS: server cheating in read result: "
1632                 "count %u > recvd %u\n", count, recvd);
1633         count = recvd;
1634         eof = 0;
1635         goto out;
1636 }
1637
1638 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1639                                  void *data)
1640 {
1641         struct nfs_pgio_res *result = data;
1642         unsigned int pos;
1643         enum nfs_stat status;
1644         int error;
1645
1646         pos = xdr_stream_pos(xdr);
1647         error = decode_nfsstat3(xdr, &status);
1648         if (unlikely(error))
1649                 goto out;
1650         error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
1651         if (unlikely(error))
1652                 goto out;
1653         result->op_status = status;
1654         if (status != NFS3_OK)
1655                 goto out_status;
1656         result->replen = 4 + ((xdr_stream_pos(xdr) - pos) >> 2);
1657         error = decode_read3resok(xdr, result);
1658 out:
1659         return error;
1660 out_status:
1661         return nfs3_stat_to_errno(status);
1662 }
1663
1664 /*
1665  * 3.3.7  WRITE3res
1666  *
1667  *      enum stable_how {
1668  *              UNSTABLE  = 0,
1669  *              DATA_SYNC = 1,
1670  *              FILE_SYNC = 2
1671  *      };
1672  *
1673  *      struct WRITE3resok {
1674  *              wcc_data        file_wcc;
1675  *              count3          count;
1676  *              stable_how      committed;
1677  *              writeverf3      verf;
1678  *      };
1679  *
1680  *      struct WRITE3resfail {
1681  *              wcc_data        file_wcc;
1682  *      };
1683  *
1684  *      union WRITE3res switch (nfsstat3 status) {
1685  *      case NFS3_OK:
1686  *              WRITE3resok     resok;
1687  *      default:
1688  *              WRITE3resfail   resfail;
1689  *      };
1690  */
1691 static int decode_write3resok(struct xdr_stream *xdr,
1692                               struct nfs_pgio_res *result)
1693 {
1694         __be32 *p;
1695
1696         p = xdr_inline_decode(xdr, 4 + 4);
1697         if (unlikely(!p))
1698                 return -EIO;
1699         result->count = be32_to_cpup(p++);
1700         result->verf->committed = be32_to_cpup(p++);
1701         if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1702                 goto out_badvalue;
1703         if (decode_writeverf3(xdr, &result->verf->verifier))
1704                 return -EIO;
1705         return result->count;
1706 out_badvalue:
1707         dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1708         return -EIO;
1709 }
1710
1711 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1712                                   void *data)
1713 {
1714         struct nfs_pgio_res *result = data;
1715         enum nfs_stat status;
1716         int error;
1717
1718         error = decode_nfsstat3(xdr, &status);
1719         if (unlikely(error))
1720                 goto out;
1721         error = decode_wcc_data(xdr, result->fattr, rpc_rqst_userns(req));
1722         if (unlikely(error))
1723                 goto out;
1724         result->op_status = status;
1725         if (status != NFS3_OK)
1726                 goto out_status;
1727         error = decode_write3resok(xdr, result);
1728 out:
1729         return error;
1730 out_status:
1731         return nfs3_stat_to_errno(status);
1732 }
1733
1734 /*
1735  * 3.3.8  CREATE3res
1736  *
1737  *      struct CREATE3resok {
1738  *              post_op_fh3     obj;
1739  *              post_op_attr    obj_attributes;
1740  *              wcc_data        dir_wcc;
1741  *      };
1742  *
1743  *      struct CREATE3resfail {
1744  *              wcc_data        dir_wcc;
1745  *      };
1746  *
1747  *      union CREATE3res switch (nfsstat3 status) {
1748  *      case NFS3_OK:
1749  *              CREATE3resok    resok;
1750  *      default:
1751  *              CREATE3resfail  resfail;
1752  *      };
1753  */
1754 static int decode_create3resok(struct xdr_stream *xdr,
1755                                struct nfs3_diropres *result,
1756                                struct user_namespace *userns)
1757 {
1758         int error;
1759
1760         error = decode_post_op_fh3(xdr, result->fh);
1761         if (unlikely(error))
1762                 goto out;
1763         error = decode_post_op_attr(xdr, result->fattr, userns);
1764         if (unlikely(error))
1765                 goto out;
1766         /* The server isn't required to return a file handle.
1767          * If it didn't, force the client to perform a LOOKUP
1768          * to determine the correct file handle and attribute
1769          * values for the new object. */
1770         if (result->fh->size == 0)
1771                 result->fattr->valid = 0;
1772         error = decode_wcc_data(xdr, result->dir_attr, userns);
1773 out:
1774         return error;
1775 }
1776
1777 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1778                                    struct xdr_stream *xdr,
1779                                    void *data)
1780 {
1781         struct user_namespace *userns = rpc_rqst_userns(req);
1782         struct nfs3_diropres *result = data;
1783         enum nfs_stat status;
1784         int error;
1785
1786         error = decode_nfsstat3(xdr, &status);
1787         if (unlikely(error))
1788                 goto out;
1789         if (status != NFS3_OK)
1790                 goto out_default;
1791         error = decode_create3resok(xdr, result, userns);
1792 out:
1793         return error;
1794 out_default:
1795         error = decode_wcc_data(xdr, result->dir_attr, userns);
1796         if (unlikely(error))
1797                 goto out;
1798         return nfs3_stat_to_errno(status);
1799 }
1800
1801 /*
1802  * 3.3.12  REMOVE3res
1803  *
1804  *      struct REMOVE3resok {
1805  *              wcc_data    dir_wcc;
1806  *      };
1807  *
1808  *      struct REMOVE3resfail {
1809  *              wcc_data    dir_wcc;
1810  *      };
1811  *
1812  *      union REMOVE3res switch (nfsstat3 status) {
1813  *      case NFS3_OK:
1814  *              REMOVE3resok   resok;
1815  *      default:
1816  *              REMOVE3resfail resfail;
1817  *      };
1818  */
1819 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1820                                    struct xdr_stream *xdr,
1821                                    void *data)
1822 {
1823         struct nfs_removeres *result = data;
1824         enum nfs_stat status;
1825         int error;
1826
1827         error = decode_nfsstat3(xdr, &status);
1828         if (unlikely(error))
1829                 goto out;
1830         error = decode_wcc_data(xdr, result->dir_attr, rpc_rqst_userns(req));
1831         if (unlikely(error))
1832                 goto out;
1833         if (status != NFS3_OK)
1834                 goto out_status;
1835 out:
1836         return error;
1837 out_status:
1838         return nfs3_stat_to_errno(status);
1839 }
1840
1841 /*
1842  * 3.3.14  RENAME3res
1843  *
1844  *      struct RENAME3resok {
1845  *              wcc_data        fromdir_wcc;
1846  *              wcc_data        todir_wcc;
1847  *      };
1848  *
1849  *      struct RENAME3resfail {
1850  *              wcc_data        fromdir_wcc;
1851  *              wcc_data        todir_wcc;
1852  *      };
1853  *
1854  *      union RENAME3res switch (nfsstat3 status) {
1855  *      case NFS3_OK:
1856  *              RENAME3resok   resok;
1857  *      default:
1858  *              RENAME3resfail resfail;
1859  *      };
1860  */
1861 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1862                                    struct xdr_stream *xdr,
1863                                    void *data)
1864 {
1865         struct user_namespace *userns = rpc_rqst_userns(req);
1866         struct nfs_renameres *result = data;
1867         enum nfs_stat status;
1868         int error;
1869
1870         error = decode_nfsstat3(xdr, &status);
1871         if (unlikely(error))
1872                 goto out;
1873         error = decode_wcc_data(xdr, result->old_fattr, userns);
1874         if (unlikely(error))
1875                 goto out;
1876         error = decode_wcc_data(xdr, result->new_fattr, userns);
1877         if (unlikely(error))
1878                 goto out;
1879         if (status != NFS3_OK)
1880                 goto out_status;
1881 out:
1882         return error;
1883 out_status:
1884         return nfs3_stat_to_errno(status);
1885 }
1886
1887 /*
1888  * 3.3.15  LINK3res
1889  *
1890  *      struct LINK3resok {
1891  *              post_op_attr    file_attributes;
1892  *              wcc_data        linkdir_wcc;
1893  *      };
1894  *
1895  *      struct LINK3resfail {
1896  *              post_op_attr    file_attributes;
1897  *              wcc_data        linkdir_wcc;
1898  *      };
1899  *
1900  *      union LINK3res switch (nfsstat3 status) {
1901  *      case NFS3_OK:
1902  *              LINK3resok      resok;
1903  *      default:
1904  *              LINK3resfail    resfail;
1905  *      };
1906  */
1907 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1908                                  void *data)
1909 {
1910         struct user_namespace *userns = rpc_rqst_userns(req);
1911         struct nfs3_linkres *result = data;
1912         enum nfs_stat status;
1913         int error;
1914
1915         error = decode_nfsstat3(xdr, &status);
1916         if (unlikely(error))
1917                 goto out;
1918         error = decode_post_op_attr(xdr, result->fattr, userns);
1919         if (unlikely(error))
1920                 goto out;
1921         error = decode_wcc_data(xdr, result->dir_attr, userns);
1922         if (unlikely(error))
1923                 goto out;
1924         if (status != NFS3_OK)
1925                 goto out_status;
1926 out:
1927         return error;
1928 out_status:
1929         return nfs3_stat_to_errno(status);
1930 }
1931
1932 /**
1933  * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1934  *                      the local page cache
1935  * @xdr: XDR stream where entry resides
1936  * @entry: buffer to fill in with entry data
1937  * @plus: boolean indicating whether this should be a readdirplus entry
1938  *
1939  * Returns zero if successful, otherwise a negative errno value is
1940  * returned.
1941  *
1942  * This function is not invoked during READDIR reply decoding, but
1943  * rather whenever an application invokes the getdents(2) system call
1944  * on a directory already in our cache.
1945  *
1946  * 3.3.16  entry3
1947  *
1948  *      struct entry3 {
1949  *              fileid3         fileid;
1950  *              filename3       name;
1951  *              cookie3         cookie;
1952  *              fhandle3        filehandle;
1953  *              post_op_attr3   attributes;
1954  *              entry3          *nextentry;
1955  *      };
1956  *
1957  * 3.3.17  entryplus3
1958  *      struct entryplus3 {
1959  *              fileid3         fileid;
1960  *              filename3       name;
1961  *              cookie3         cookie;
1962  *              post_op_attr    name_attributes;
1963  *              post_op_fh3     name_handle;
1964  *              entryplus3      *nextentry;
1965  *      };
1966  */
1967 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1968                        bool plus)
1969 {
1970         struct user_namespace *userns = rpc_userns(entry->server->client);
1971         __be32 *p;
1972         int error;
1973         u64 new_cookie;
1974
1975         p = xdr_inline_decode(xdr, 4);
1976         if (unlikely(!p))
1977                 return -EAGAIN;
1978         if (*p == xdr_zero) {
1979                 p = xdr_inline_decode(xdr, 4);
1980                 if (unlikely(!p))
1981                         return -EAGAIN;
1982                 if (*p == xdr_zero)
1983                         return -EAGAIN;
1984                 entry->eof = 1;
1985                 return -EBADCOOKIE;
1986         }
1987
1988         error = decode_fileid3(xdr, &entry->ino);
1989         if (unlikely(error))
1990                 return -EAGAIN;
1991
1992         error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1993         if (unlikely(error))
1994                 return error == -ENAMETOOLONG ? -ENAMETOOLONG : -EAGAIN;
1995
1996         error = decode_cookie3(xdr, &new_cookie);
1997         if (unlikely(error))
1998                 return -EAGAIN;
1999
2000         entry->d_type = DT_UNKNOWN;
2001
2002         if (plus) {
2003                 entry->fattr->valid = 0;
2004                 error = decode_post_op_attr(xdr, entry->fattr, userns);
2005                 if (unlikely(error))
2006                         return -EAGAIN;
2007                 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
2008                         entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
2009
2010                 if (entry->fattr->fileid != entry->ino) {
2011                         entry->fattr->mounted_on_fileid = entry->ino;
2012                         entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
2013                 }
2014
2015                 /* In fact, a post_op_fh3: */
2016                 p = xdr_inline_decode(xdr, 4);
2017                 if (unlikely(!p))
2018                         return -EAGAIN;
2019                 if (*p != xdr_zero) {
2020                         error = decode_nfs_fh3(xdr, entry->fh);
2021                         if (unlikely(error))
2022                                 return -EAGAIN;
2023                 } else
2024                         zero_nfs_fh3(entry->fh);
2025         }
2026
2027         entry->prev_cookie = entry->cookie;
2028         entry->cookie = new_cookie;
2029
2030         return 0;
2031 }
2032
2033 /*
2034  * 3.3.16  READDIR3res
2035  *
2036  *      struct dirlist3 {
2037  *              entry3          *entries;
2038  *              bool            eof;
2039  *      };
2040  *
2041  *      struct READDIR3resok {
2042  *              post_op_attr    dir_attributes;
2043  *              cookieverf3     cookieverf;
2044  *              dirlist3        reply;
2045  *      };
2046  *
2047  *      struct READDIR3resfail {
2048  *              post_op_attr    dir_attributes;
2049  *      };
2050  *
2051  *      union READDIR3res switch (nfsstat3 status) {
2052  *      case NFS3_OK:
2053  *              READDIR3resok   resok;
2054  *      default:
2055  *              READDIR3resfail resfail;
2056  *      };
2057  *
2058  * Read the directory contents into the page cache, but otherwise
2059  * don't touch them.  The actual decoding is done by nfs3_decode_entry()
2060  * during subsequent nfs_readdir() calls.
2061  */
2062 static int decode_dirlist3(struct xdr_stream *xdr)
2063 {
2064         return xdr_read_pages(xdr, xdr->buf->page_len);
2065 }
2066
2067 static int decode_readdir3resok(struct xdr_stream *xdr,
2068                                 struct nfs3_readdirres *result,
2069                                 struct user_namespace *userns)
2070 {
2071         int error;
2072
2073         error = decode_post_op_attr(xdr, result->dir_attr, userns);
2074         if (unlikely(error))
2075                 goto out;
2076         /* XXX: do we need to check if result->verf != NULL ? */
2077         error = decode_cookieverf3(xdr, result->verf);
2078         if (unlikely(error))
2079                 goto out;
2080         error = decode_dirlist3(xdr);
2081 out:
2082         return error;
2083 }
2084
2085 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2086                                     struct xdr_stream *xdr,
2087                                     void *data)
2088 {
2089         struct nfs3_readdirres *result = data;
2090         enum nfs_stat status;
2091         int error;
2092
2093         error = decode_nfsstat3(xdr, &status);
2094         if (unlikely(error))
2095                 goto out;
2096         if (status != NFS3_OK)
2097                 goto out_default;
2098         error = decode_readdir3resok(xdr, result, rpc_rqst_userns(req));
2099 out:
2100         return error;
2101 out_default:
2102         error = decode_post_op_attr(xdr, result->dir_attr, rpc_rqst_userns(req));
2103         if (unlikely(error))
2104                 goto out;
2105         return nfs3_stat_to_errno(status);
2106 }
2107
2108 /*
2109  * 3.3.18  FSSTAT3res
2110  *
2111  *      struct FSSTAT3resok {
2112  *              post_op_attr    obj_attributes;
2113  *              size3           tbytes;
2114  *              size3           fbytes;
2115  *              size3           abytes;
2116  *              size3           tfiles;
2117  *              size3           ffiles;
2118  *              size3           afiles;
2119  *              uint32          invarsec;
2120  *      };
2121  *
2122  *      struct FSSTAT3resfail {
2123  *              post_op_attr    obj_attributes;
2124  *      };
2125  *
2126  *      union FSSTAT3res switch (nfsstat3 status) {
2127  *      case NFS3_OK:
2128  *              FSSTAT3resok    resok;
2129  *      default:
2130  *              FSSTAT3resfail  resfail;
2131  *      };
2132  */
2133 static int decode_fsstat3resok(struct xdr_stream *xdr,
2134                                struct nfs_fsstat *result)
2135 {
2136         __be32 *p;
2137
2138         p = xdr_inline_decode(xdr, 8 * 6 + 4);
2139         if (unlikely(!p))
2140                 return -EIO;
2141         p = xdr_decode_size3(p, &result->tbytes);
2142         p = xdr_decode_size3(p, &result->fbytes);
2143         p = xdr_decode_size3(p, &result->abytes);
2144         p = xdr_decode_size3(p, &result->tfiles);
2145         p = xdr_decode_size3(p, &result->ffiles);
2146         xdr_decode_size3(p, &result->afiles);
2147         /* ignore invarsec */
2148         return 0;
2149 }
2150
2151 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2152                                    struct xdr_stream *xdr,
2153                                    void *data)
2154 {
2155         struct nfs_fsstat *result = data;
2156         enum nfs_stat status;
2157         int error;
2158
2159         error = decode_nfsstat3(xdr, &status);
2160         if (unlikely(error))
2161                 goto out;
2162         error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2163         if (unlikely(error))
2164                 goto out;
2165         if (status != NFS3_OK)
2166                 goto out_status;
2167         error = decode_fsstat3resok(xdr, result);
2168 out:
2169         return error;
2170 out_status:
2171         return nfs3_stat_to_errno(status);
2172 }
2173
2174 /*
2175  * 3.3.19  FSINFO3res
2176  *
2177  *      struct FSINFO3resok {
2178  *              post_op_attr    obj_attributes;
2179  *              uint32          rtmax;
2180  *              uint32          rtpref;
2181  *              uint32          rtmult;
2182  *              uint32          wtmax;
2183  *              uint32          wtpref;
2184  *              uint32          wtmult;
2185  *              uint32          dtpref;
2186  *              size3           maxfilesize;
2187  *              nfstime3        time_delta;
2188  *              uint32          properties;
2189  *      };
2190  *
2191  *      struct FSINFO3resfail {
2192  *              post_op_attr    obj_attributes;
2193  *      };
2194  *
2195  *      union FSINFO3res switch (nfsstat3 status) {
2196  *      case NFS3_OK:
2197  *              FSINFO3resok    resok;
2198  *      default:
2199  *              FSINFO3resfail  resfail;
2200  *      };
2201  */
2202 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2203                                struct nfs_fsinfo *result)
2204 {
2205         __be32 *p;
2206
2207         p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2208         if (unlikely(!p))
2209                 return -EIO;
2210         result->rtmax  = be32_to_cpup(p++);
2211         result->rtpref = be32_to_cpup(p++);
2212         result->rtmult = be32_to_cpup(p++);
2213         result->wtmax  = be32_to_cpup(p++);
2214         result->wtpref = be32_to_cpup(p++);
2215         result->wtmult = be32_to_cpup(p++);
2216         result->dtpref = be32_to_cpup(p++);
2217         p = xdr_decode_size3(p, &result->maxfilesize);
2218         xdr_decode_nfstime3(p, &result->time_delta);
2219
2220         /* ignore properties */
2221         result->lease_time = 0;
2222         return 0;
2223 }
2224
2225 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2226                                    struct xdr_stream *xdr,
2227                                    void *data)
2228 {
2229         struct nfs_fsinfo *result = data;
2230         enum nfs_stat status;
2231         int error;
2232
2233         error = decode_nfsstat3(xdr, &status);
2234         if (unlikely(error))
2235                 goto out;
2236         error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2237         if (unlikely(error))
2238                 goto out;
2239         if (status != NFS3_OK)
2240                 goto out_status;
2241         error = decode_fsinfo3resok(xdr, result);
2242 out:
2243         return error;
2244 out_status:
2245         return nfs3_stat_to_errno(status);
2246 }
2247
2248 /*
2249  * 3.3.20  PATHCONF3res
2250  *
2251  *      struct PATHCONF3resok {
2252  *              post_op_attr    obj_attributes;
2253  *              uint32          linkmax;
2254  *              uint32          name_max;
2255  *              bool            no_trunc;
2256  *              bool            chown_restricted;
2257  *              bool            case_insensitive;
2258  *              bool            case_preserving;
2259  *      };
2260  *
2261  *      struct PATHCONF3resfail {
2262  *              post_op_attr    obj_attributes;
2263  *      };
2264  *
2265  *      union PATHCONF3res switch (nfsstat3 status) {
2266  *      case NFS3_OK:
2267  *              PATHCONF3resok  resok;
2268  *      default:
2269  *              PATHCONF3resfail resfail;
2270  *      };
2271  */
2272 static int decode_pathconf3resok(struct xdr_stream *xdr,
2273                                  struct nfs_pathconf *result)
2274 {
2275         __be32 *p;
2276
2277         p = xdr_inline_decode(xdr, 4 * 6);
2278         if (unlikely(!p))
2279                 return -EIO;
2280         result->max_link = be32_to_cpup(p++);
2281         result->max_namelen = be32_to_cpup(p);
2282         /* ignore remaining fields */
2283         return 0;
2284 }
2285
2286 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2287                                      struct xdr_stream *xdr,
2288                                      void *data)
2289 {
2290         struct nfs_pathconf *result = data;
2291         enum nfs_stat status;
2292         int error;
2293
2294         error = decode_nfsstat3(xdr, &status);
2295         if (unlikely(error))
2296                 goto out;
2297         error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2298         if (unlikely(error))
2299                 goto out;
2300         if (status != NFS3_OK)
2301                 goto out_status;
2302         error = decode_pathconf3resok(xdr, result);
2303 out:
2304         return error;
2305 out_status:
2306         return nfs3_stat_to_errno(status);
2307 }
2308
2309 /*
2310  * 3.3.21  COMMIT3res
2311  *
2312  *      struct COMMIT3resok {
2313  *              wcc_data        file_wcc;
2314  *              writeverf3      verf;
2315  *      };
2316  *
2317  *      struct COMMIT3resfail {
2318  *              wcc_data        file_wcc;
2319  *      };
2320  *
2321  *      union COMMIT3res switch (nfsstat3 status) {
2322  *      case NFS3_OK:
2323  *              COMMIT3resok    resok;
2324  *      default:
2325  *              COMMIT3resfail  resfail;
2326  *      };
2327  */
2328 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2329                                    struct xdr_stream *xdr,
2330                                    void *data)
2331 {
2332         struct nfs_commitres *result = data;
2333         struct nfs_writeverf *verf = result->verf;
2334         enum nfs_stat status;
2335         int error;
2336
2337         error = decode_nfsstat3(xdr, &status);
2338         if (unlikely(error))
2339                 goto out;
2340         error = decode_wcc_data(xdr, result->fattr, rpc_rqst_userns(req));
2341         if (unlikely(error))
2342                 goto out;
2343         result->op_status = status;
2344         if (status != NFS3_OK)
2345                 goto out_status;
2346         error = decode_writeverf3(xdr, &verf->verifier);
2347         if (!error)
2348                 verf->committed = NFS_FILE_SYNC;
2349 out:
2350         return error;
2351 out_status:
2352         return nfs3_stat_to_errno(status);
2353 }
2354
2355 #ifdef CONFIG_NFS_V3_ACL
2356
2357 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2358                                       struct nfs3_getaclres *result,
2359                                       struct user_namespace *userns)
2360 {
2361         struct posix_acl **acl;
2362         unsigned int *aclcnt;
2363         size_t hdrlen;
2364         int error;
2365
2366         error = decode_post_op_attr(xdr, result->fattr, userns);
2367         if (unlikely(error))
2368                 goto out;
2369         error = decode_uint32(xdr, &result->mask);
2370         if (unlikely(error))
2371                 goto out;
2372         error = -EINVAL;
2373         if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2374                 goto out;
2375
2376         hdrlen = xdr_stream_pos(xdr);
2377
2378         acl = NULL;
2379         if (result->mask & NFS_ACL)
2380                 acl = &result->acl_access;
2381         aclcnt = NULL;
2382         if (result->mask & NFS_ACLCNT)
2383                 aclcnt = &result->acl_access_count;
2384         error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2385         if (unlikely(error <= 0))
2386                 goto out;
2387
2388         acl = NULL;
2389         if (result->mask & NFS_DFACL)
2390                 acl = &result->acl_default;
2391         aclcnt = NULL;
2392         if (result->mask & NFS_DFACLCNT)
2393                 aclcnt = &result->acl_default_count;
2394         error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2395         if (unlikely(error <= 0))
2396                 return error;
2397         error = 0;
2398 out:
2399         return error;
2400 }
2401
2402 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2403                                    struct xdr_stream *xdr,
2404                                    void *result)
2405 {
2406         enum nfs_stat status;
2407         int error;
2408
2409         error = decode_nfsstat3(xdr, &status);
2410         if (unlikely(error))
2411                 goto out;
2412         if (status != NFS3_OK)
2413                 goto out_default;
2414         error = decode_getacl3resok(xdr, result, rpc_rqst_userns(req));
2415 out:
2416         return error;
2417 out_default:
2418         return nfs3_stat_to_errno(status);
2419 }
2420
2421 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2422                                    struct xdr_stream *xdr,
2423                                    void *result)
2424 {
2425         enum nfs_stat status;
2426         int error;
2427
2428         error = decode_nfsstat3(xdr, &status);
2429         if (unlikely(error))
2430                 goto out;
2431         if (status != NFS3_OK)
2432                 goto out_default;
2433         error = decode_post_op_attr(xdr, result, rpc_rqst_userns(req));
2434 out:
2435         return error;
2436 out_default:
2437         return nfs3_stat_to_errno(status);
2438 }
2439
2440 #endif  /* CONFIG_NFS_V3_ACL */
2441
2442
2443 /*
2444  * We need to translate between nfs status return values and
2445  * the local errno values which may not be the same.
2446  */
2447 static const struct {
2448         int stat;
2449         int errno;
2450 } nfs_errtbl[] = {
2451         { NFS_OK,               0               },
2452         { NFSERR_PERM,          -EPERM          },
2453         { NFSERR_NOENT,         -ENOENT         },
2454         { NFSERR_IO,            -errno_NFSERR_IO},
2455         { NFSERR_NXIO,          -ENXIO          },
2456 /*      { NFSERR_EAGAIN,        -EAGAIN         }, */
2457         { NFSERR_ACCES,         -EACCES         },
2458         { NFSERR_EXIST,         -EEXIST         },
2459         { NFSERR_XDEV,          -EXDEV          },
2460         { NFSERR_NODEV,         -ENODEV         },
2461         { NFSERR_NOTDIR,        -ENOTDIR        },
2462         { NFSERR_ISDIR,         -EISDIR         },
2463         { NFSERR_INVAL,         -EINVAL         },
2464         { NFSERR_FBIG,          -EFBIG          },
2465         { NFSERR_NOSPC,         -ENOSPC         },
2466         { NFSERR_ROFS,          -EROFS          },
2467         { NFSERR_MLINK,         -EMLINK         },
2468         { NFSERR_NAMETOOLONG,   -ENAMETOOLONG   },
2469         { NFSERR_NOTEMPTY,      -ENOTEMPTY      },
2470         { NFSERR_DQUOT,         -EDQUOT         },
2471         { NFSERR_STALE,         -ESTALE         },
2472         { NFSERR_REMOTE,        -EREMOTE        },
2473 #ifdef EWFLUSH
2474         { NFSERR_WFLUSH,        -EWFLUSH        },
2475 #endif
2476         { NFSERR_BADHANDLE,     -EBADHANDLE     },
2477         { NFSERR_NOT_SYNC,      -ENOTSYNC       },
2478         { NFSERR_BAD_COOKIE,    -EBADCOOKIE     },
2479         { NFSERR_NOTSUPP,       -ENOTSUPP       },
2480         { NFSERR_TOOSMALL,      -ETOOSMALL      },
2481         { NFSERR_SERVERFAULT,   -EREMOTEIO      },
2482         { NFSERR_BADTYPE,       -EBADTYPE       },
2483         { NFSERR_JUKEBOX,       -EJUKEBOX       },
2484         { -1,                   -EIO            }
2485 };
2486
2487 /**
2488  * nfs3_stat_to_errno - convert an NFS status code to a local errno
2489  * @status: NFS status code to convert
2490  *
2491  * Returns a local errno value, or -EIO if the NFS status code is
2492  * not recognized.  This function is used jointly by NFSv2 and NFSv3.
2493  */
2494 static int nfs3_stat_to_errno(enum nfs_stat status)
2495 {
2496         int i;
2497
2498         for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2499                 if (nfs_errtbl[i].stat == (int)status)
2500                         return nfs_errtbl[i].errno;
2501         }
2502         dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2503         return nfs_errtbl[i].errno;
2504 }
2505
2506
2507 #define PROC(proc, argtype, restype, timer)                             \
2508 [NFS3PROC_##proc] = {                                                   \
2509         .p_proc      = NFS3PROC_##proc,                                 \
2510         .p_encode    = nfs3_xdr_enc_##argtype##3args,                   \
2511         .p_decode    = nfs3_xdr_dec_##restype##3res,                    \
2512         .p_arglen    = NFS3_##argtype##args_sz,                         \
2513         .p_replen    = NFS3_##restype##res_sz,                          \
2514         .p_timer     = timer,                                           \
2515         .p_statidx   = NFS3PROC_##proc,                                 \
2516         .p_name      = #proc,                                           \
2517         }
2518
2519 const struct rpc_procinfo nfs3_procedures[] = {
2520         PROC(GETATTR,           getattr,        getattr,        1),
2521         PROC(SETATTR,           setattr,        setattr,        0),
2522         PROC(LOOKUP,            lookup,         lookup,         2),
2523         PROC(ACCESS,            access,         access,         1),
2524         PROC(READLINK,          readlink,       readlink,       3),
2525         PROC(READ,              read,           read,           3),
2526         PROC(WRITE,             write,          write,          4),
2527         PROC(CREATE,            create,         create,         0),
2528         PROC(MKDIR,             mkdir,          create,         0),
2529         PROC(SYMLINK,           symlink,        create,         0),
2530         PROC(MKNOD,             mknod,          create,         0),
2531         PROC(REMOVE,            remove,         remove,         0),
2532         PROC(RMDIR,             lookup,         setattr,        0),
2533         PROC(RENAME,            rename,         rename,         0),
2534         PROC(LINK,              link,           link,           0),
2535         PROC(READDIR,           readdir,        readdir,        3),
2536         PROC(READDIRPLUS,       readdirplus,    readdir,        3),
2537         PROC(FSSTAT,            getattr,        fsstat,         0),
2538         PROC(FSINFO,            getattr,        fsinfo,         0),
2539         PROC(PATHCONF,          getattr,        pathconf,       0),
2540         PROC(COMMIT,            commit,         commit,         5),
2541 };
2542
2543 static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)];
2544 const struct rpc_version nfs_version3 = {
2545         .number                 = 3,
2546         .nrprocs                = ARRAY_SIZE(nfs3_procedures),
2547         .procs                  = nfs3_procedures,
2548         .counts                 = nfs_version3_counts,
2549 };
2550
2551 #ifdef CONFIG_NFS_V3_ACL
2552 static const struct rpc_procinfo nfs3_acl_procedures[] = {
2553         [ACLPROC3_GETACL] = {
2554                 .p_proc = ACLPROC3_GETACL,
2555                 .p_encode = nfs3_xdr_enc_getacl3args,
2556                 .p_decode = nfs3_xdr_dec_getacl3res,
2557                 .p_arglen = ACL3_getaclargs_sz,
2558                 .p_replen = ACL3_getaclres_sz,
2559                 .p_timer = 1,
2560                 .p_name = "GETACL",
2561         },
2562         [ACLPROC3_SETACL] = {
2563                 .p_proc = ACLPROC3_SETACL,
2564                 .p_encode = nfs3_xdr_enc_setacl3args,
2565                 .p_decode = nfs3_xdr_dec_setacl3res,
2566                 .p_arglen = ACL3_setaclargs_sz,
2567                 .p_replen = ACL3_setaclres_sz,
2568                 .p_timer = 0,
2569                 .p_name = "SETACL",
2570         },
2571 };
2572
2573 static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)];
2574 const struct rpc_version nfsacl_version3 = {
2575         .number                 = 3,
2576         .nrprocs                = ARRAY_SIZE(nfs3_acl_procedures),
2577         .procs                  = nfs3_acl_procedures,
2578         .counts                 = nfs3_acl_counts,
2579 };
2580 #endif  /* CONFIG_NFS_V3_ACL */