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_pagepad_sz         (1) /* Page padding */
  37 #define NFS3_fhandle_sz         (1+16)
  38 #define NFS3_fh_sz              (NFS3_fhandle_sz)       /* shorthand */
  39 #define NFS3_post_op_fh_sz      (1+NFS3_fh_sz)
  40 #define NFS3_sattr_sz           (15)
  41 #define NFS3_filename_sz        (1+(NFS3_MAXNAMLEN>>2))
  42 #define NFS3_path_sz            (1+(NFS3_MAXPATHLEN>>2))
  43 #define NFS3_fattr_sz           (21)
  44 #define NFS3_cookieverf_sz      (NFS3_COOKIEVERFSIZE>>2)
  45 #define NFS3_wcc_attr_sz        (6)
  46 #define NFS3_pre_op_attr_sz     (1+NFS3_wcc_attr_sz)
  47 #define NFS3_post_op_attr_sz    (1+NFS3_fattr_sz)
  48 #define NFS3_wcc_data_sz        (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
  49 #define NFS3_diropargs_sz       (NFS3_fh_sz+NFS3_filename_sz)
  50
  51 #define NFS3_getattrargs_sz     (NFS3_fh_sz)
  52 #define NFS3_setattrargs_sz     (NFS3_fh_sz+NFS3_sattr_sz+3)
  53 #define NFS3_lookupargs_sz      (NFS3_fh_sz+NFS3_filename_sz)
  54 #define NFS3_accessargs_sz      (NFS3_fh_sz+1)
  55 #define NFS3_readlinkargs_sz    (NFS3_fh_sz)
  56 #define NFS3_readargs_sz        (NFS3_fh_sz+3)
  57 #define NFS3_writeargs_sz       (NFS3_fh_sz+5)
  58 #define NFS3_createargs_sz      (NFS3_diropargs_sz+NFS3_sattr_sz)
  59 #define NFS3_mkdirargs_sz       (NFS3_diropargs_sz+NFS3_sattr_sz)
  60 #define NFS3_symlinkargs_sz     (NFS3_diropargs_sz+1+NFS3_sattr_sz)
  61 #define NFS3_mknodargs_sz       (NFS3_diropargs_sz+2+NFS3_sattr_sz)
  62 #define NFS3_removeargs_sz      (NFS3_fh_sz+NFS3_filename_sz)
  63 #define NFS3_renameargs_sz      (NFS3_diropargs_sz+NFS3_diropargs_sz)
  64 #define NFS3_linkargs_sz                (NFS3_fh_sz+NFS3_diropargs_sz)
  65 #define NFS3_readdirargs_sz     (NFS3_fh_sz+NFS3_cookieverf_sz+3)
  66 #define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
  67 #define NFS3_commitargs_sz      (NFS3_fh_sz+3)
  68
  69 #define NFS3_getattrres_sz      (1+NFS3_fattr_sz)
  70 #define NFS3_setattrres_sz      (1+NFS3_wcc_data_sz)
  71 #define NFS3_removeres_sz       (NFS3_setattrres_sz)
  72 #define NFS3_lookupres_sz       (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
  73 #define NFS3_accessres_sz       (1+NFS3_post_op_attr_sz+1)
  74 #define NFS3_readlinkres_sz     (1+NFS3_post_op_attr_sz+1+NFS3_pagepad_sz)
  75 #define NFS3_readres_sz         (1+NFS3_post_op_attr_sz+3+NFS3_pagepad_sz)
  76 #define NFS3_writeres_sz        (1+NFS3_wcc_data_sz+4)
  77 #define NFS3_createres_sz       (1+NFS3_post_op_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
  78 #define NFS3_renameres_sz       (1+(2 * NFS3_wcc_data_sz))
  79 #define NFS3_linkres_sz         (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
  80 #define NFS3_readdirres_sz      (1+NFS3_post_op_attr_sz+2+NFS3_pagepad_sz)
  81 #define NFS3_fsstatres_sz       (1+NFS3_post_op_attr_sz+13)
  82 #define NFS3_fsinfores_sz       (1+NFS3_post_op_attr_sz+12)
  83 #define NFS3_pathconfres_sz     (1+NFS3_post_op_attr_sz+6)
  84 #define NFS3_commitres_sz       (1+NFS3_wcc_data_sz+2)
  85
  86 #define ACL3_getaclargs_sz      (NFS3_fh_sz+1)
  87 #define ACL3_setaclargs_sz      (NFS3_fh_sz+1+ \
  88                                 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
  89 #define ACL3_getaclres_sz       (1+NFS3_post_op_attr_sz+1+ \
  90                                 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)+\
  91                                 NFS3_pagepad_sz)
  92 #define ACL3_setaclres_sz       (1+NFS3_post_op_attr_sz)
  93
  94 static int nfs3_stat_to_errno(enum nfs_stat);
  95
  96 /*
  97  * Map file type to S_IFMT bits
  98  */
  99 static const umode_t nfs_type2fmt[] = {
 100         [NF3BAD] = 0,
 101         [NF3REG] = S_IFREG,
 102         [NF3DIR] = S_IFDIR,
 103         [NF3BLK] = S_IFBLK,
 104         [NF3CHR] = S_IFCHR,
 105         [NF3LNK] = S_IFLNK,
 106         [NF3SOCK] = S_IFSOCK,
 107         [NF3FIFO] = S_IFIFO,
 108 };
 109
 110 static struct user_namespace *rpc_userns(const struct rpc_clnt *clnt)
 111 {
 112         if (clnt && clnt->cl_cred)
 113                 return clnt->cl_cred->user_ns;
 114         return &init_user_ns;
 115 }
 116
 117 static struct user_namespace *rpc_rqst_userns(const struct rpc_rqst *rqstp)
 118 {
 119         if (rqstp->rq_task)
 120                 return rpc_userns(rqstp->rq_task->tk_client);
 121         return &init_user_ns;
 122 }
 123
 124 /*
 125  * Encode/decode NFSv3 basic data types
 126  *
 127  * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
 128  * "NFS Version 3 Protocol Specification".
 129  *
 130  * Not all basic data types have their own encoding and decoding
 131  * functions.  For run-time efficiency, some data types are encoded
 132  * or decoded inline.
 133  */
 134
 135 static void encode_uint32(struct xdr_stream *xdr, u32 value)
 136 {
 137         __be32 *p = xdr_reserve_space(xdr, 4);
 138         *p = cpu_to_be32(value);
 139 }
 140
 141 static int decode_uint32(struct xdr_stream *xdr, u32 *value)
 142 {
 143         __be32 *p;
 144
 145         p = xdr_inline_decode(xdr, 4);
 146         if (unlikely(!p))
 147                 return -EIO;
 148         *value = be32_to_cpup(p);
 149         return 0;
 150 }
 151
 152 static int decode_uint64(struct xdr_stream *xdr, u64 *value)
 153 {
 154         __be32 *p;
 155
 156         p = xdr_inline_decode(xdr, 8);
 157         if (unlikely(!p))
 158                 return -EIO;
 159         xdr_decode_hyper(p, value);
 160         return 0;
 161 }
 162
 163 /*
 164  * fileid3
 165  *
 166  *      typedef uint64 fileid3;
 167  */
 168 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
 169 {
 170         return xdr_decode_hyper(p, fileid);
 171 }
 172
 173 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
 174 {
 175         return decode_uint64(xdr, fileid);
 176 }
 177
 178 /*
 179  * filename3
 180  *
 181  *      typedef string filename3<>;
 182  */
 183 static void encode_filename3(struct xdr_stream *xdr,
 184                              const char *name, u32 length)
 185 {
 186         __be32 *p;
 187
 188         WARN_ON_ONCE(length > NFS3_MAXNAMLEN);
 189         p = xdr_reserve_space(xdr, 4 + length);
 190         xdr_encode_opaque(p, name, length);
 191 }
 192
 193 static int decode_inline_filename3(struct xdr_stream *xdr,
 194                                    const char **name, u32 *length)
 195 {
 196         __be32 *p;
 197         u32 count;
 198
 199         p = xdr_inline_decode(xdr, 4);
 200         if (unlikely(!p))
 201                 return -EIO;
 202         count = be32_to_cpup(p);
 203         if (count > NFS3_MAXNAMLEN)
 204                 goto out_nametoolong;
 205         p = xdr_inline_decode(xdr, count);
 206         if (unlikely(!p))
 207                 return -EIO;
 208         *name = (const char *)p;
 209         *length = count;
 210         return 0;
 211
 212 out_nametoolong:
 213         dprintk("NFS: returned filename too long: %u\n", count);
 214         return -ENAMETOOLONG;
 215 }
 216
 217 /*
 218  * nfspath3
 219  *
 220  *      typedef string nfspath3<>;
 221  */
 222 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
 223                             const u32 length)
 224 {
 225         encode_uint32(xdr, length);
 226         xdr_write_pages(xdr, pages, 0, length);
 227 }
 228
 229 static int decode_nfspath3(struct xdr_stream *xdr)
 230 {
 231         u32 recvd, count;
 232         __be32 *p;
 233
 234         p = xdr_inline_decode(xdr, 4);
 235         if (unlikely(!p))
 236                 return -EIO;
 237         count = be32_to_cpup(p);
 238         if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
 239                 goto out_nametoolong;
 240         recvd = xdr_read_pages(xdr, count);
 241         if (unlikely(count > recvd))
 242                 goto out_cheating;
 243         xdr_terminate_string(xdr->buf, count);
 244         return 0;
 245
 246 out_nametoolong:
 247         dprintk("NFS: returned pathname too long: %u\n", count);
 248         return -ENAMETOOLONG;
 249 out_cheating:
 250         dprintk("NFS: server cheating in pathname result: "
 251                 "count %u > recvd %u\n", count, recvd);
 252         return -EIO;
 253 }
 254
 255 /*
 256  * cookie3
 257  *
 258  *      typedef uint64 cookie3
 259  */
 260 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
 261 {
 262         return xdr_encode_hyper(p, cookie);
 263 }
 264
 265 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
 266 {
 267         return decode_uint64(xdr, cookie);
 268 }
 269
 270 /*
 271  * cookieverf3
 272  *
 273  *      typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
 274  */
 275 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
 276 {
 277         memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
 278         return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
 279 }
 280
 281 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
 282 {
 283         __be32 *p;
 284
 285         p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
 286         if (unlikely(!p))
 287                 return -EIO;
 288         memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
 289         return 0;
 290 }
 291
 292 /*
 293  * createverf3
 294  *
 295  *      typedef opaque createverf3[NFS3_CREATEVERFSIZE];
 296  */
 297 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
 298 {
 299         __be32 *p;
 300
 301         p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
 302         memcpy(p, verifier, NFS3_CREATEVERFSIZE);
 303 }
 304
 305 static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
 306 {
 307         __be32 *p;
 308
 309         p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
 310         if (unlikely(!p))
 311                 return -EIO;
 312         memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
 313         return 0;
 314 }
 315
 316 /*
 317  * size3
 318  *
 319  *      typedef uint64 size3;
 320  */
 321 static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
 322 {
 323         return xdr_decode_hyper(p, size);
 324 }
 325
 326 /*
 327  * nfsstat3
 328  *
 329  *      enum nfsstat3 {
 330  *              NFS3_OK = 0,
 331  *              ...
 332  *      }
 333  */
 334 #define NFS3_OK         NFS_OK
 335
 336 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
 337 {
 338         __be32 *p;
 339
 340         p = xdr_inline_decode(xdr, 4);
 341         if (unlikely(!p))
 342                 return -EIO;
 343         if (unlikely(*p != cpu_to_be32(NFS3_OK)))
 344                 goto out_status;
 345         *status = 0;
 346         return 0;
 347 out_status:
 348         *status = be32_to_cpup(p);
 349         trace_nfs_xdr_status(xdr, (int)*status);
 350         return 0;
 351 }
 352
 353 /*
 354  * ftype3
 355  *
 356  *      enum ftype3 {
 357  *              NF3REG  = 1,
 358  *              NF3DIR  = 2,
 359  *              NF3BLK  = 3,
 360  *              NF3CHR  = 4,
 361  *              NF3LNK  = 5,
 362  *              NF3SOCK = 6,
 363  *              NF3FIFO = 7
 364  *      };
 365  */
 366 static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
 367 {
 368         encode_uint32(xdr, type);
 369 }
 370
 371 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
 372 {
 373         u32 type;
 374
 375         type = be32_to_cpup(p++);
 376         if (type > NF3FIFO)
 377                 type = NF3NON;
 378         *mode = nfs_type2fmt[type];
 379         return p;
 380 }
 381
 382 /*
 383  * specdata3
 384  *
 385  *     struct specdata3 {
 386  *             uint32  specdata1;
 387  *             uint32  specdata2;
 388  *     };
 389  */
 390 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
 391 {
 392         __be32 *p;
 393
 394         p = xdr_reserve_space(xdr, 8);
 395         *p++ = cpu_to_be32(MAJOR(rdev));
 396         *p = cpu_to_be32(MINOR(rdev));
 397 }
 398
 399 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
 400 {
 401         unsigned int major, minor;
 402
 403         major = be32_to_cpup(p++);
 404         minor = be32_to_cpup(p++);
 405         *rdev = MKDEV(major, minor);
 406         if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
 407                 *rdev = 0;
 408         return p;
 409 }
 410
 411 /*
 412  * nfs_fh3
 413  *
 414  *      struct nfs_fh3 {
 415  *              opaque       data<NFS3_FHSIZE>;
 416  *      };
 417  */
 418 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
 419 {
 420         __be32 *p;
 421
 422         WARN_ON_ONCE(fh->size > NFS3_FHSIZE);
 423         p = xdr_reserve_space(xdr, 4 + fh->size);
 424         xdr_encode_opaque(p, fh->data, fh->size);
 425 }
 426
 427 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
 428 {
 429         u32 length;
 430         __be32 *p;
 431
 432         p = xdr_inline_decode(xdr, 4);
 433         if (unlikely(!p))
 434                 return -EIO;
 435         length = be32_to_cpup(p++);
 436         if (unlikely(length > NFS3_FHSIZE || length == 0))
 437                 goto out_toobig;
 438         p = xdr_inline_decode(xdr, length);
 439         if (unlikely(!p))
 440                 return -EIO;
 441         fh->size = length;
 442         memcpy(fh->data, p, length);
 443         return 0;
 444 out_toobig:
 445         trace_nfs_xdr_bad_filehandle(xdr, NFSERR_BADHANDLE);
 446         return -E2BIG;
 447 }
 448
 449 static void zero_nfs_fh3(struct nfs_fh *fh)
 450 {
 451         memset(fh, 0, sizeof(*fh));
 452 }
 453
 454 /*
 455  * nfstime3
 456  *
 457  *      struct nfstime3 {
 458  *              uint32  seconds;
 459  *              uint32  nseconds;
 460  *      };
 461  */
 462 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec64 *timep)
 463 {
 464         *p++ = cpu_to_be32((u32)timep->tv_sec);
 465         *p++ = cpu_to_be32(timep->tv_nsec);
 466         return p;
 467 }
 468
 469 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec64 *timep)
 470 {
 471         timep->tv_sec = be32_to_cpup(p++);
 472         timep->tv_nsec = be32_to_cpup(p++);
 473         return p;
 474 }
 475
 476 /*
 477  * sattr3
 478  *
 479  *      enum time_how {
 480  *              DONT_CHANGE             = 0,
 481  *              SET_TO_SERVER_TIME      = 1,
 482  *              SET_TO_CLIENT_TIME      = 2
 483  *      };
 484  *
 485  *      union set_mode3 switch (bool set_it) {
 486  *      case TRUE:
 487  *              mode3   mode;
 488  *      default:
 489  *              void;
 490  *      };
 491  *
 492  *      union set_uid3 switch (bool set_it) {
 493  *      case TRUE:
 494  *              uid3    uid;
 495  *      default:
 496  *              void;
 497  *      };
 498  *
 499  *      union set_gid3 switch (bool set_it) {
 500  *      case TRUE:
 501  *              gid3    gid;
 502  *      default:
 503  *              void;
 504  *      };
 505  *
 506  *      union set_size3 switch (bool set_it) {
 507  *      case TRUE:
 508  *              size3   size;
 509  *      default:
 510  *              void;
 511  *      };
 512  *
 513  *      union set_atime switch (time_how set_it) {
 514  *      case SET_TO_CLIENT_TIME:
 515  *              nfstime3        atime;
 516  *      default:
 517  *              void;
 518  *      };
 519  *
 520  *      union set_mtime switch (time_how set_it) {
 521  *      case SET_TO_CLIENT_TIME:
 522  *              nfstime3  mtime;
 523  *      default:
 524  *              void;
 525  *      };
 526  *
 527  *      struct sattr3 {
 528  *              set_mode3       mode;
 529  *              set_uid3        uid;
 530  *              set_gid3        gid;
 531  *              set_size3       size;
 532  *              set_atime       atime;
 533  *              set_mtime       mtime;
 534  *      };
 535  */
 536 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr,
 537                 struct user_namespace *userns)
 538 {
 539         u32 nbytes;
 540         __be32 *p;
 541
 542         /*
 543          * In order to make only a single xdr_reserve_space() call,
 544          * pre-compute the total number of bytes to be reserved.
 545          * Six boolean values, one for each set_foo field, are always
 546          * present in the encoded result, so start there.
 547          */
 548         nbytes = 6 * 4;
 549         if (attr->ia_valid & ATTR_MODE)
 550                 nbytes += 4;
 551         if (attr->ia_valid & ATTR_UID)
 552                 nbytes += 4;
 553         if (attr->ia_valid & ATTR_GID)
 554                 nbytes += 4;
 555         if (attr->ia_valid & ATTR_SIZE)
 556                 nbytes += 8;
 557         if (attr->ia_valid & ATTR_ATIME_SET)
 558                 nbytes += 8;
 559         if (attr->ia_valid & ATTR_MTIME_SET)
 560                 nbytes += 8;
 561         p = xdr_reserve_space(xdr, nbytes);
 562
 563         if (attr->ia_valid & ATTR_MODE) {
 564                 *p++ = xdr_one;
 565                 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
 566         } else
 567                 *p++ = xdr_zero;
 568
 569         if (attr->ia_valid & ATTR_UID) {
 570                 *p++ = xdr_one;
 571                 *p++ = cpu_to_be32(from_kuid_munged(userns, attr->ia_uid));
 572         } else
 573                 *p++ = xdr_zero;
 574
 575         if (attr->ia_valid & ATTR_GID) {
 576                 *p++ = xdr_one;
 577                 *p++ = cpu_to_be32(from_kgid_munged(userns, attr->ia_gid));
 578         } else
 579                 *p++ = xdr_zero;
 580
 581         if (attr->ia_valid & ATTR_SIZE) {
 582                 *p++ = xdr_one;
 583                 p = xdr_encode_hyper(p, (u64)attr->ia_size);
 584         } else
 585                 *p++ = xdr_zero;
 586
 587         if (attr->ia_valid & ATTR_ATIME_SET) {
 588                 *p++ = xdr_two;
 589                 p = xdr_encode_nfstime3(p, &attr->ia_atime);
 590         } else if (attr->ia_valid & ATTR_ATIME) {
 591                 *p++ = xdr_one;
 592         } else
 593                 *p++ = xdr_zero;
 594
 595         if (attr->ia_valid & ATTR_MTIME_SET) {
 596                 *p++ = xdr_two;
 597                 xdr_encode_nfstime3(p, &attr->ia_mtime);
 598         } else if (attr->ia_valid & ATTR_MTIME) {
 599                 *p = xdr_one;
 600         } else
 601                 *p = xdr_zero;
 602 }
 603
 604 /*
 605  * fattr3
 606  *
 607  *      struct fattr3 {
 608  *              ftype3          type;
 609  *              mode3           mode;
 610  *              uint32          nlink;
 611  *              uid3            uid;
 612  *              gid3            gid;
 613  *              size3           size;
 614  *              size3           used;
 615  *              specdata3       rdev;
 616  *              uint64          fsid;
 617  *              fileid3         fileid;
 618  *              nfstime3        atime;
 619  *              nfstime3        mtime;
 620  *              nfstime3        ctime;
 621  *      };
 622  */
 623 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr,
 624                 struct user_namespace *userns)
 625 {
 626         umode_t fmode;
 627         __be32 *p;
 628
 629         p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
 630         if (unlikely(!p))
 631                 return -EIO;
 632
 633         p = xdr_decode_ftype3(p, &fmode);
 634
 635         fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
 636         fattr->nlink = be32_to_cpup(p++);
 637         fattr->uid = make_kuid(userns, be32_to_cpup(p++));
 638         if (!uid_valid(fattr->uid))
 639                 goto out_uid;
 640         fattr->gid = make_kgid(userns, be32_to_cpup(p++));
 641         if (!gid_valid(fattr->gid))
 642                 goto out_gid;
 643
 644         p = xdr_decode_size3(p, &fattr->size);
 645         p = xdr_decode_size3(p, &fattr->du.nfs3.used);
 646         p = xdr_decode_specdata3(p, &fattr->rdev);
 647
 648         p = xdr_decode_hyper(p, &fattr->fsid.major);
 649         fattr->fsid.minor = 0;
 650
 651         p = xdr_decode_fileid3(p, &fattr->fileid);
 652         p = xdr_decode_nfstime3(p, &fattr->atime);
 653         p = xdr_decode_nfstime3(p, &fattr->mtime);
 654         xdr_decode_nfstime3(p, &fattr->ctime);
 655         fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
 656
 657         fattr->valid |= NFS_ATTR_FATTR_V3;
 658         return 0;
 659 out_uid:
 660         dprintk("NFS: returned invalid uid\n");
 661         return -EINVAL;
 662 out_gid:
 663         dprintk("NFS: returned invalid gid\n");
 664         return -EINVAL;
 665 }
 666
 667 /*
 668  * post_op_attr
 669  *
 670  *      union post_op_attr switch (bool attributes_follow) {
 671  *      case TRUE:
 672  *              fattr3  attributes;
 673  *      case FALSE:
 674  *              void;
 675  *      };
 676  */
 677 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
 678                 struct user_namespace *userns)
 679 {
 680         __be32 *p;
 681
 682         p = xdr_inline_decode(xdr, 4);
 683         if (unlikely(!p))
 684                 return -EIO;
 685         if (*p != xdr_zero)
 686                 return decode_fattr3(xdr, fattr, userns);
 687         return 0;
 688 }
 689
 690 /*
 691  * wcc_attr
 692  *      struct wcc_attr {
 693  *              size3           size;
 694  *              nfstime3        mtime;
 695  *              nfstime3        ctime;
 696  *      };
 697  */
 698 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 699 {
 700         __be32 *p;
 701
 702         p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
 703         if (unlikely(!p))
 704                 return -EIO;
 705
 706         fattr->valid |= NFS_ATTR_FATTR_PRESIZE
 707                 | NFS_ATTR_FATTR_PRECHANGE
 708                 | NFS_ATTR_FATTR_PREMTIME
 709                 | NFS_ATTR_FATTR_PRECTIME;
 710
 711         p = xdr_decode_size3(p, &fattr->pre_size);
 712         p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
 713         xdr_decode_nfstime3(p, &fattr->pre_ctime);
 714         fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
 715
 716         return 0;
 717 }
 718
 719 /*
 720  * pre_op_attr
 721  *      union pre_op_attr switch (bool attributes_follow) {
 722  *      case TRUE:
 723  *              wcc_attr        attributes;
 724  *      case FALSE:
 725  *              void;
 726  *      };
 727  *
 728  * wcc_data
 729  *
 730  *      struct wcc_data {
 731  *              pre_op_attr     before;
 732  *              post_op_attr    after;
 733  *      };
 734  */
 735 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 736 {
 737         __be32 *p;
 738
 739         p = xdr_inline_decode(xdr, 4);
 740         if (unlikely(!p))
 741                 return -EIO;
 742         if (*p != xdr_zero)
 743                 return decode_wcc_attr(xdr, fattr);
 744         return 0;
 745 }
 746
 747 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr,
 748                 struct user_namespace *userns)
 749 {
 750         int error;
 751
 752         error = decode_pre_op_attr(xdr, fattr);
 753         if (unlikely(error))
 754                 goto out;
 755         error = decode_post_op_attr(xdr, fattr, userns);
 756 out:
 757         return error;
 758 }
 759
 760 /*
 761  * post_op_fh3
 762  *
 763  *      union post_op_fh3 switch (bool handle_follows) {
 764  *      case TRUE:
 765  *              nfs_fh3  handle;
 766  *      case FALSE:
 767  *              void;
 768  *      };
 769  */
 770 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
 771 {
 772         __be32 *p = xdr_inline_decode(xdr, 4);
 773         if (unlikely(!p))
 774                 return -EIO;
 775         if (*p != xdr_zero)
 776                 return decode_nfs_fh3(xdr, fh);
 777         zero_nfs_fh3(fh);
 778         return 0;
 779 }
 780
 781 /*
 782  * diropargs3
 783  *
 784  *      struct diropargs3 {
 785  *              nfs_fh3         dir;
 786  *              filename3       name;
 787  *      };
 788  */
 789 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
 790                               const char *name, u32 length)
 791 {
 792         encode_nfs_fh3(xdr, fh);
 793         encode_filename3(xdr, name, length);
 794 }
 795
 796
 797 /*
 798  * NFSv3 XDR encode functions
 799  *
 800  * NFSv3 argument types are defined in section 3.3 of RFC 1813:
 801  * "NFS Version 3 Protocol Specification".
 802  */
 803
 804 /*
 805  * 3.3.1  GETATTR3args
 806  *
 807  *      struct GETATTR3args {
 808  *              nfs_fh3  object;
 809  *      };
 810  */
 811 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
 812                                       struct xdr_stream *xdr,
 813                                       const void *data)
 814 {
 815         const struct nfs_fh *fh = data;
 816
 817         encode_nfs_fh3(xdr, fh);
 818 }
 819
 820 /*
 821  * 3.3.2  SETATTR3args
 822  *
 823  *      union sattrguard3 switch (bool check) {
 824  *      case TRUE:
 825  *              nfstime3  obj_ctime;
 826  *      case FALSE:
 827  *              void;
 828  *      };
 829  *
 830  *      struct SETATTR3args {
 831  *              nfs_fh3         object;
 832  *              sattr3          new_attributes;
 833  *              sattrguard3     guard;
 834  *      };
 835  */
 836 static void encode_sattrguard3(struct xdr_stream *xdr,
 837                                const struct nfs3_sattrargs *args)
 838 {
 839         __be32 *p;
 840
 841         if (args->guard) {
 842                 p = xdr_reserve_space(xdr, 4 + 8);
 843                 *p++ = xdr_one;
 844                 xdr_encode_nfstime3(p, &args->guardtime);
 845         } else {
 846                 p = xdr_reserve_space(xdr, 4);
 847                 *p = xdr_zero;
 848         }
 849 }
 850
 851 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
 852                                       struct xdr_stream *xdr,
 853                                       const void *data)
 854 {
 855         const struct nfs3_sattrargs *args = data;
 856         encode_nfs_fh3(xdr, args->fh);
 857         encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req));
 858         encode_sattrguard3(xdr, args);
 859 }
 860
 861 /*
 862  * 3.3.3  LOOKUP3args
 863  *
 864  *      struct LOOKUP3args {
 865  *              diropargs3  what;
 866  *      };
 867  */
 868 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
 869                                      struct xdr_stream *xdr,
 870                                      const void *data)
 871 {
 872         const struct nfs3_diropargs *args = data;
 873
 874         encode_diropargs3(xdr, args->fh, args->name, args->len);
 875 }
 876
 877 /*
 878  * 3.3.4  ACCESS3args
 879  *
 880  *      struct ACCESS3args {
 881  *              nfs_fh3         object;
 882  *              uint32          access;
 883  *      };
 884  */
 885 static void encode_access3args(struct xdr_stream *xdr,
 886                                const struct nfs3_accessargs *args)
 887 {
 888         encode_nfs_fh3(xdr, args->fh);
 889         encode_uint32(xdr, args->access);
 890 }
 891
 892 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
 893                                      struct xdr_stream *xdr,
 894                                      const void *data)
 895 {
 896         const struct nfs3_accessargs *args = data;
 897
 898         encode_access3args(xdr, args);
 899 }
 900
 901 /*
 902  * 3.3.5  READLINK3args
 903  *
 904  *      struct READLINK3args {
 905  *              nfs_fh3 symlink;
 906  *      };
 907  */
 908 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
 909                                        struct xdr_stream *xdr,
 910                                        const void *data)
 911 {
 912         const struct nfs3_readlinkargs *args = data;
 913
 914         encode_nfs_fh3(xdr, args->fh);
 915         rpc_prepare_reply_pages(req, args->pages, args->pgbase, args->pglen,
 916                                 NFS3_readlinkres_sz - NFS3_pagepad_sz);
 917 }
 918
 919 /*
 920  * 3.3.6  READ3args
 921  *
 922  *      struct READ3args {
 923  *              nfs_fh3         file;
 924  *              offset3         offset;
 925  *              count3          count;
 926  *      };
 927  */
 928 static void encode_read3args(struct xdr_stream *xdr,
 929                              const struct nfs_pgio_args *args)
 930 {
 931         __be32 *p;
 932
 933         encode_nfs_fh3(xdr, args->fh);
 934
 935         p = xdr_reserve_space(xdr, 8 + 4);
 936         p = xdr_encode_hyper(p, args->offset);
 937         *p = cpu_to_be32(args->count);
 938 }
 939
 940 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
 941                                    struct xdr_stream *xdr,
 942                                    const void *data)
 943 {
 944         const struct nfs_pgio_args *args = data;
 945         unsigned int replen = args->replen ? args->replen :
 946                                              NFS3_readres_sz - NFS3_pagepad_sz;
 947
 948         encode_read3args(xdr, args);
 949         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
 950                                 args->count, replen);
 951         req->rq_rcv_buf.flags |= XDRBUF_READ;
 952 }
 953
 954 /*
 955  * 3.3.7  WRITE3args
 956  *
 957  *      enum stable_how {
 958  *              UNSTABLE  = 0,
 959  *              DATA_SYNC = 1,
 960  *              FILE_SYNC = 2
 961  *      };
 962  *
 963  *      struct WRITE3args {
 964  *              nfs_fh3         file;
 965  *              offset3         offset;
 966  *              count3          count;
 967  *              stable_how      stable;
 968  *              opaque          data<>;
 969  *      };
 970  */
 971 static void encode_write3args(struct xdr_stream *xdr,
 972                               const struct nfs_pgio_args *args)
 973 {
 974         __be32 *p;
 975
 976         encode_nfs_fh3(xdr, args->fh);
 977
 978         p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
 979         p = xdr_encode_hyper(p, args->offset);
 980         *p++ = cpu_to_be32(args->count);
 981         *p++ = cpu_to_be32(args->stable);
 982         *p = cpu_to_be32(args->count);
 983         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
 984 }
 985
 986 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
 987                                     struct xdr_stream *xdr,
 988                                     const void *data)
 989 {
 990         const struct nfs_pgio_args *args = data;
 991
 992         encode_write3args(xdr, args);
 993         xdr->buf->flags |= XDRBUF_WRITE;
 994 }
 995
 996 /*
 997  * 3.3.8  CREATE3args
 998  *
 999  *      enum createmode3 {
1000  *              UNCHECKED = 0,
1001  *              GUARDED   = 1,
1002  *              EXCLUSIVE = 2
1003  *      };
1004  *
1005  *      union createhow3 switch (createmode3 mode) {
1006  *      case UNCHECKED:
1007  *      case GUARDED:
1008  *              sattr3       obj_attributes;
1009  *      case EXCLUSIVE:
1010  *              createverf3  verf;
1011  *      };
1012  *
1013  *      struct CREATE3args {
1014  *              diropargs3      where;
1015  *              createhow3      how;
1016  *      };
1017  */
1018 static void encode_createhow3(struct xdr_stream *xdr,
1019                               const struct nfs3_createargs *args,
1020                               struct user_namespace *userns)
1021 {
1022         encode_uint32(xdr, args->createmode);
1023         switch (args->createmode) {
1024         case NFS3_CREATE_UNCHECKED:
1025         case NFS3_CREATE_GUARDED:
1026                 encode_sattr3(xdr, args->sattr, userns);
1027                 break;
1028         case NFS3_CREATE_EXCLUSIVE:
1029                 encode_createverf3(xdr, args->verifier);
1030                 break;
1031         default:
1032                 BUG();
1033         }
1034 }
1035
1036 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1037                                      struct xdr_stream *xdr,
1038                                      const void *data)
1039 {
1040         const struct nfs3_createargs *args = data;
1041
1042         encode_diropargs3(xdr, args->fh, args->name, args->len);
1043         encode_createhow3(xdr, args, rpc_rqst_userns(req));
1044 }
1045
1046 /*
1047  * 3.3.9  MKDIR3args
1048  *
1049  *      struct MKDIR3args {
1050  *              diropargs3      where;
1051  *              sattr3          attributes;
1052  *      };
1053  */
1054 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1055                                     struct xdr_stream *xdr,
1056                                     const void *data)
1057 {
1058         const struct nfs3_mkdirargs *args = data;
1059
1060         encode_diropargs3(xdr, args->fh, args->name, args->len);
1061         encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req));
1062 }
1063
1064 /*
1065  * 3.3.10  SYMLINK3args
1066  *
1067  *      struct symlinkdata3 {
1068  *              sattr3          symlink_attributes;
1069  *              nfspath3        symlink_data;
1070  *      };
1071  *
1072  *      struct SYMLINK3args {
1073  *              diropargs3      where;
1074  *              symlinkdata3    symlink;
1075  *      };
1076  */
1077 static void encode_symlinkdata3(struct xdr_stream *xdr,
1078                                 const void *data,
1079                                 struct user_namespace *userns)
1080 {
1081         const struct nfs3_symlinkargs *args = data;
1082
1083         encode_sattr3(xdr, args->sattr, userns);
1084         encode_nfspath3(xdr, args->pages, args->pathlen);
1085 }
1086
1087 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1088                                       struct xdr_stream *xdr,
1089                                       const void *data)
1090 {
1091         const struct nfs3_symlinkargs *args = data;
1092
1093         encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1094         encode_symlinkdata3(xdr, args, rpc_rqst_userns(req));
1095         xdr->buf->flags |= XDRBUF_WRITE;
1096 }
1097
1098 /*
1099  * 3.3.11  MKNOD3args
1100  *
1101  *      struct devicedata3 {
1102  *              sattr3          dev_attributes;
1103  *              specdata3       spec;
1104  *      };
1105  *
1106  *      union mknoddata3 switch (ftype3 type) {
1107  *      case NF3CHR:
1108  *      case NF3BLK:
1109  *              devicedata3     device;
1110  *      case NF3SOCK:
1111  *      case NF3FIFO:
1112  *              sattr3          pipe_attributes;
1113  *      default:
1114  *              void;
1115  *      };
1116  *
1117  *      struct MKNOD3args {
1118  *              diropargs3      where;
1119  *              mknoddata3      what;
1120  *      };
1121  */
1122 static void encode_devicedata3(struct xdr_stream *xdr,
1123                                const struct nfs3_mknodargs *args,
1124                                struct user_namespace *userns)
1125 {
1126         encode_sattr3(xdr, args->sattr, userns);
1127         encode_specdata3(xdr, args->rdev);
1128 }
1129
1130 static void encode_mknoddata3(struct xdr_stream *xdr,
1131                               const struct nfs3_mknodargs *args,
1132                               struct user_namespace *userns)
1133 {
1134         encode_ftype3(xdr, args->type);
1135         switch (args->type) {
1136         case NF3CHR:
1137         case NF3BLK:
1138                 encode_devicedata3(xdr, args, userns);
1139                 break;
1140         case NF3SOCK:
1141         case NF3FIFO:
1142                 encode_sattr3(xdr, args->sattr, userns);
1143                 break;
1144         case NF3REG:
1145         case NF3DIR:
1146                 break;
1147         default:
1148                 BUG();
1149         }
1150 }
1151
1152 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1153                                     struct xdr_stream *xdr,
1154                                     const void *data)
1155 {
1156         const struct nfs3_mknodargs *args = data;
1157
1158         encode_diropargs3(xdr, args->fh, args->name, args->len);
1159         encode_mknoddata3(xdr, args, rpc_rqst_userns(req));
1160 }
1161
1162 /*
1163  * 3.3.12  REMOVE3args
1164  *
1165  *      struct REMOVE3args {
1166  *              diropargs3  object;
1167  *      };
1168  */
1169 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1170                                      struct xdr_stream *xdr,
1171                                      const void *data)
1172 {
1173         const struct nfs_removeargs *args = data;
1174
1175         encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1176 }
1177
1178 /*
1179  * 3.3.14  RENAME3args
1180  *
1181  *      struct RENAME3args {
1182  *              diropargs3      from;
1183  *              diropargs3      to;
1184  *      };
1185  */
1186 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1187                                      struct xdr_stream *xdr,
1188                                      const void *data)
1189 {
1190         const struct nfs_renameargs *args = data;
1191         const struct qstr *old = args->old_name;
1192         const struct qstr *new = args->new_name;
1193
1194         encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1195         encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1196 }
1197
1198 /*
1199  * 3.3.15  LINK3args
1200  *
1201  *      struct LINK3args {
1202  *              nfs_fh3         file;
1203  *              diropargs3      link;
1204  *      };
1205  */
1206 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1207                                    struct xdr_stream *xdr,
1208                                    const void *data)
1209 {
1210         const struct nfs3_linkargs *args = data;
1211
1212         encode_nfs_fh3(xdr, args->fromfh);
1213         encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1214 }
1215
1216 /*
1217  * 3.3.16  READDIR3args
1218  *
1219  *      struct READDIR3args {
1220  *              nfs_fh3         dir;
1221  *              cookie3         cookie;
1222  *              cookieverf3     cookieverf;
1223  *              count3          count;
1224  *      };
1225  */
1226 static void encode_readdir3args(struct xdr_stream *xdr,
1227                                 const struct nfs3_readdirargs *args)
1228 {
1229         __be32 *p;
1230
1231         encode_nfs_fh3(xdr, args->fh);
1232
1233         p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1234         p = xdr_encode_cookie3(p, args->cookie);
1235         p = xdr_encode_cookieverf3(p, args->verf);
1236         *p = cpu_to_be32(args->count);
1237 }
1238
1239 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1240                                       struct xdr_stream *xdr,
1241                                       const void *data)
1242 {
1243         const struct nfs3_readdirargs *args = data;
1244
1245         encode_readdir3args(xdr, args);
1246         rpc_prepare_reply_pages(req, args->pages, 0, args->count,
1247                                 NFS3_readdirres_sz - NFS3_pagepad_sz);
1248 }
1249
1250 /*
1251  * 3.3.17  READDIRPLUS3args
1252  *
1253  *      struct READDIRPLUS3args {
1254  *              nfs_fh3         dir;
1255  *              cookie3         cookie;
1256  *              cookieverf3     cookieverf;
1257  *              count3          dircount;
1258  *              count3          maxcount;
1259  *      };
1260  */
1261 static void encode_readdirplus3args(struct xdr_stream *xdr,
1262                                     const struct nfs3_readdirargs *args)
1263 {
1264         uint32_t dircount = args->count;
1265         uint32_t maxcount = args->count;
1266         __be32 *p;
1267
1268         encode_nfs_fh3(xdr, args->fh);
1269
1270         p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1271         p = xdr_encode_cookie3(p, args->cookie);
1272         p = xdr_encode_cookieverf3(p, args->verf);
1273
1274         /*
1275          * readdirplus: need dircount + buffer size.
1276          * We just make sure we make dircount big enough
1277          */
1278         *p++ = cpu_to_be32(dircount);
1279         *p = cpu_to_be32(maxcount);
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, args->count,
1290                                 NFS3_readdirres_sz - NFS3_pagepad_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 - NFS3_pagepad_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 = 3 + ((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 -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->cookie = new_cookie;
2028
2029         return 0;
2030 }
2031
2032 /*
2033  * 3.3.16  READDIR3res
2034  *
2035  *      struct dirlist3 {
2036  *              entry3          *entries;
2037  *              bool            eof;
2038  *      };
2039  *
2040  *      struct READDIR3resok {
2041  *              post_op_attr    dir_attributes;
2042  *              cookieverf3     cookieverf;
2043  *              dirlist3        reply;
2044  *      };
2045  *
2046  *      struct READDIR3resfail {
2047  *              post_op_attr    dir_attributes;
2048  *      };
2049  *
2050  *      union READDIR3res switch (nfsstat3 status) {
2051  *      case NFS3_OK:
2052  *              READDIR3resok   resok;
2053  *      default:
2054  *              READDIR3resfail resfail;
2055  *      };
2056  *
2057  * Read the directory contents into the page cache, but otherwise
2058  * don't touch them.  The actual decoding is done by nfs3_decode_entry()
2059  * during subsequent nfs_readdir() calls.
2060  */
2061 static int decode_dirlist3(struct xdr_stream *xdr)
2062 {
2063         return xdr_read_pages(xdr, xdr->buf->page_len);
2064 }
2065
2066 static int decode_readdir3resok(struct xdr_stream *xdr,
2067                                 struct nfs3_readdirres *result,
2068                                 struct user_namespace *userns)
2069 {
2070         int error;
2071
2072         error = decode_post_op_attr(xdr, result->dir_attr, userns);
2073         if (unlikely(error))
2074                 goto out;
2075         /* XXX: do we need to check if result->verf != NULL ? */
2076         error = decode_cookieverf3(xdr, result->verf);
2077         if (unlikely(error))
2078                 goto out;
2079         error = decode_dirlist3(xdr);
2080 out:
2081         return error;
2082 }
2083
2084 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2085                                     struct xdr_stream *xdr,
2086                                     void *data)
2087 {
2088         struct nfs3_readdirres *result = data;
2089         enum nfs_stat status;
2090         int error;
2091
2092         error = decode_nfsstat3(xdr, &status);
2093         if (unlikely(error))
2094                 goto out;
2095         if (status != NFS3_OK)
2096                 goto out_default;
2097         error = decode_readdir3resok(xdr, result, rpc_rqst_userns(req));
2098 out:
2099         return error;
2100 out_default:
2101         error = decode_post_op_attr(xdr, result->dir_attr, rpc_rqst_userns(req));
2102         if (unlikely(error))
2103                 goto out;
2104         return nfs3_stat_to_errno(status);
2105 }
2106
2107 /*
2108  * 3.3.18  FSSTAT3res
2109  *
2110  *      struct FSSTAT3resok {
2111  *              post_op_attr    obj_attributes;
2112  *              size3           tbytes;
2113  *              size3           fbytes;
2114  *              size3           abytes;
2115  *              size3           tfiles;
2116  *              size3           ffiles;
2117  *              size3           afiles;
2118  *              uint32          invarsec;
2119  *      };
2120  *
2121  *      struct FSSTAT3resfail {
2122  *              post_op_attr    obj_attributes;
2123  *      };
2124  *
2125  *      union FSSTAT3res switch (nfsstat3 status) {
2126  *      case NFS3_OK:
2127  *              FSSTAT3resok    resok;
2128  *      default:
2129  *              FSSTAT3resfail  resfail;
2130  *      };
2131  */
2132 static int decode_fsstat3resok(struct xdr_stream *xdr,
2133                                struct nfs_fsstat *result)
2134 {
2135         __be32 *p;
2136
2137         p = xdr_inline_decode(xdr, 8 * 6 + 4);
2138         if (unlikely(!p))
2139                 return -EIO;
2140         p = xdr_decode_size3(p, &result->tbytes);
2141         p = xdr_decode_size3(p, &result->fbytes);
2142         p = xdr_decode_size3(p, &result->abytes);
2143         p = xdr_decode_size3(p, &result->tfiles);
2144         p = xdr_decode_size3(p, &result->ffiles);
2145         xdr_decode_size3(p, &result->afiles);
2146         /* ignore invarsec */
2147         return 0;
2148 }
2149
2150 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2151                                    struct xdr_stream *xdr,
2152                                    void *data)
2153 {
2154         struct nfs_fsstat *result = data;
2155         enum nfs_stat status;
2156         int error;
2157
2158         error = decode_nfsstat3(xdr, &status);
2159         if (unlikely(error))
2160                 goto out;
2161         error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2162         if (unlikely(error))
2163                 goto out;
2164         if (status != NFS3_OK)
2165                 goto out_status;
2166         error = decode_fsstat3resok(xdr, result);
2167 out:
2168         return error;
2169 out_status:
2170         return nfs3_stat_to_errno(status);
2171 }
2172
2173 /*
2174  * 3.3.19  FSINFO3res
2175  *
2176  *      struct FSINFO3resok {
2177  *              post_op_attr    obj_attributes;
2178  *              uint32          rtmax;
2179  *              uint32          rtpref;
2180  *              uint32          rtmult;
2181  *              uint32          wtmax;
2182  *              uint32          wtpref;
2183  *              uint32          wtmult;
2184  *              uint32          dtpref;
2185  *              size3           maxfilesize;
2186  *              nfstime3        time_delta;
2187  *              uint32          properties;
2188  *      };
2189  *
2190  *      struct FSINFO3resfail {
2191  *              post_op_attr    obj_attributes;
2192  *      };
2193  *
2194  *      union FSINFO3res switch (nfsstat3 status) {
2195  *      case NFS3_OK:
2196  *              FSINFO3resok    resok;
2197  *      default:
2198  *              FSINFO3resfail  resfail;
2199  *      };
2200  */
2201 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2202                                struct nfs_fsinfo *result)
2203 {
2204         __be32 *p;
2205
2206         p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2207         if (unlikely(!p))
2208                 return -EIO;
2209         result->rtmax  = be32_to_cpup(p++);
2210         result->rtpref = be32_to_cpup(p++);
2211         result->rtmult = be32_to_cpup(p++);
2212         result->wtmax  = be32_to_cpup(p++);
2213         result->wtpref = be32_to_cpup(p++);
2214         result->wtmult = be32_to_cpup(p++);
2215         result->dtpref = be32_to_cpup(p++);
2216         p = xdr_decode_size3(p, &result->maxfilesize);
2217         xdr_decode_nfstime3(p, &result->time_delta);
2218
2219         /* ignore properties */
2220         result->lease_time = 0;
2221         result->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED;
2222         result->xattr_support = 0;
2223         return 0;
2224 }
2225
2226 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2227                                    struct xdr_stream *xdr,
2228                                    void *data)
2229 {
2230         struct nfs_fsinfo *result = data;
2231         enum nfs_stat status;
2232         int error;
2233
2234         error = decode_nfsstat3(xdr, &status);
2235         if (unlikely(error))
2236                 goto out;
2237         error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2238         if (unlikely(error))
2239                 goto out;
2240         if (status != NFS3_OK)
2241                 goto out_status;
2242         error = decode_fsinfo3resok(xdr, result);
2243 out:
2244         return error;
2245 out_status:
2246         return nfs3_stat_to_errno(status);
2247 }
2248
2249 /*
2250  * 3.3.20  PATHCONF3res
2251  *
2252  *      struct PATHCONF3resok {
2253  *              post_op_attr    obj_attributes;
2254  *              uint32          linkmax;
2255  *              uint32          name_max;
2256  *              bool            no_trunc;
2257  *              bool            chown_restricted;
2258  *              bool            case_insensitive;
2259  *              bool            case_preserving;
2260  *      };
2261  *
2262  *      struct PATHCONF3resfail {
2263  *              post_op_attr    obj_attributes;
2264  *      };
2265  *
2266  *      union PATHCONF3res switch (nfsstat3 status) {
2267  *      case NFS3_OK:
2268  *              PATHCONF3resok  resok;
2269  *      default:
2270  *              PATHCONF3resfail resfail;
2271  *      };
2272  */
2273 static int decode_pathconf3resok(struct xdr_stream *xdr,
2274                                  struct nfs_pathconf *result)
2275 {
2276         __be32 *p;
2277
2278         p = xdr_inline_decode(xdr, 4 * 6);
2279         if (unlikely(!p))
2280                 return -EIO;
2281         result->max_link = be32_to_cpup(p++);
2282         result->max_namelen = be32_to_cpup(p);
2283         /* ignore remaining fields */
2284         return 0;
2285 }
2286
2287 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2288                                      struct xdr_stream *xdr,
2289                                      void *data)
2290 {
2291         struct nfs_pathconf *result = data;
2292         enum nfs_stat status;
2293         int error;
2294
2295         error = decode_nfsstat3(xdr, &status);
2296         if (unlikely(error))
2297                 goto out;
2298         error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2299         if (unlikely(error))
2300                 goto out;
2301         if (status != NFS3_OK)
2302                 goto out_status;
2303         error = decode_pathconf3resok(xdr, result);
2304 out:
2305         return error;
2306 out_status:
2307         return nfs3_stat_to_errno(status);
2308 }
2309
2310 /*
2311  * 3.3.21  COMMIT3res
2312  *
2313  *      struct COMMIT3resok {
2314  *              wcc_data        file_wcc;
2315  *              writeverf3      verf;
2316  *      };
2317  *
2318  *      struct COMMIT3resfail {
2319  *              wcc_data        file_wcc;
2320  *      };
2321  *
2322  *      union COMMIT3res switch (nfsstat3 status) {
2323  *      case NFS3_OK:
2324  *              COMMIT3resok    resok;
2325  *      default:
2326  *              COMMIT3resfail  resfail;
2327  *      };
2328  */
2329 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2330                                    struct xdr_stream *xdr,
2331                                    void *data)
2332 {
2333         struct nfs_commitres *result = data;
2334         struct nfs_writeverf *verf = result->verf;
2335         enum nfs_stat status;
2336         int error;
2337
2338         error = decode_nfsstat3(xdr, &status);
2339         if (unlikely(error))
2340                 goto out;
2341         error = decode_wcc_data(xdr, result->fattr, rpc_rqst_userns(req));
2342         if (unlikely(error))
2343                 goto out;
2344         result->op_status = status;
2345         if (status != NFS3_OK)
2346                 goto out_status;
2347         error = decode_writeverf3(xdr, &verf->verifier);
2348         if (!error)
2349                 verf->committed = NFS_FILE_SYNC;
2350 out:
2351         return error;
2352 out_status:
2353         return nfs3_stat_to_errno(status);
2354 }
2355
2356 #ifdef CONFIG_NFS_V3_ACL
2357
2358 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2359                                       struct nfs3_getaclres *result,
2360                                       struct user_namespace *userns)
2361 {
2362         struct posix_acl **acl;
2363         unsigned int *aclcnt;
2364         size_t hdrlen;
2365         int error;
2366
2367         error = decode_post_op_attr(xdr, result->fattr, userns);
2368         if (unlikely(error))
2369                 goto out;
2370         error = decode_uint32(xdr, &result->mask);
2371         if (unlikely(error))
2372                 goto out;
2373         error = -EINVAL;
2374         if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2375                 goto out;
2376
2377         hdrlen = xdr_stream_pos(xdr);
2378
2379         acl = NULL;
2380         if (result->mask & NFS_ACL)
2381                 acl = &result->acl_access;
2382         aclcnt = NULL;
2383         if (result->mask & NFS_ACLCNT)
2384                 aclcnt = &result->acl_access_count;
2385         error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2386         if (unlikely(error <= 0))
2387                 goto out;
2388
2389         acl = NULL;
2390         if (result->mask & NFS_DFACL)
2391                 acl = &result->acl_default;
2392         aclcnt = NULL;
2393         if (result->mask & NFS_DFACLCNT)
2394                 aclcnt = &result->acl_default_count;
2395         error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2396         if (unlikely(error <= 0))
2397                 return error;
2398         error = 0;
2399 out:
2400         return error;
2401 }
2402
2403 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2404                                    struct xdr_stream *xdr,
2405                                    void *result)
2406 {
2407         enum nfs_stat status;
2408         int error;
2409
2410         error = decode_nfsstat3(xdr, &status);
2411         if (unlikely(error))
2412                 goto out;
2413         if (status != NFS3_OK)
2414                 goto out_default;
2415         error = decode_getacl3resok(xdr, result, rpc_rqst_userns(req));
2416 out:
2417         return error;
2418 out_default:
2419         return nfs3_stat_to_errno(status);
2420 }
2421
2422 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2423                                    struct xdr_stream *xdr,
2424                                    void *result)
2425 {
2426         enum nfs_stat status;
2427         int error;
2428
2429         error = decode_nfsstat3(xdr, &status);
2430         if (unlikely(error))
2431                 goto out;
2432         if (status != NFS3_OK)
2433                 goto out_default;
2434         error = decode_post_op_attr(xdr, result, rpc_rqst_userns(req));
2435 out:
2436         return error;
2437 out_default:
2438         return nfs3_stat_to_errno(status);
2439 }
2440
2441 #endif  /* CONFIG_NFS_V3_ACL */
2442
2443
2444 /*
2445  * We need to translate between nfs status return values and
2446  * the local errno values which may not be the same.
2447  */
2448 static const struct {
2449         int stat;
2450         int errno;
2451 } nfs_errtbl[] = {
2452         { NFS_OK,               0               },
2453         { NFSERR_PERM,          -EPERM          },
2454         { NFSERR_NOENT,         -ENOENT         },
2455         { NFSERR_IO,            -errno_NFSERR_IO},
2456         { NFSERR_NXIO,          -ENXIO          },
2457 /*      { NFSERR_EAGAIN,        -EAGAIN         }, */
2458         { NFSERR_ACCES,         -EACCES         },
2459         { NFSERR_EXIST,         -EEXIST         },
2460         { NFSERR_XDEV,          -EXDEV          },
2461         { NFSERR_NODEV,         -ENODEV         },
2462         { NFSERR_NOTDIR,        -ENOTDIR        },
2463         { NFSERR_ISDIR,         -EISDIR         },
2464         { NFSERR_INVAL,         -EINVAL         },
2465         { NFSERR_FBIG,          -EFBIG          },
2466         { NFSERR_NOSPC,         -ENOSPC         },
2467         { NFSERR_ROFS,          -EROFS          },
2468         { NFSERR_MLINK,         -EMLINK         },
2469         { NFSERR_NAMETOOLONG,   -ENAMETOOLONG   },
2470         { NFSERR_NOTEMPTY,      -ENOTEMPTY      },
2471         { NFSERR_DQUOT,         -EDQUOT         },
2472         { NFSERR_STALE,         -ESTALE         },
2473         { NFSERR_REMOTE,        -EREMOTE        },
2474 #ifdef EWFLUSH
2475         { NFSERR_WFLUSH,        -EWFLUSH        },
2476 #endif
2477         { NFSERR_BADHANDLE,     -EBADHANDLE     },
2478         { NFSERR_NOT_SYNC,      -ENOTSYNC       },
2479         { NFSERR_BAD_COOKIE,    -EBADCOOKIE     },
2480         { NFSERR_NOTSUPP,       -ENOTSUPP       },
2481         { NFSERR_TOOSMALL,      -ETOOSMALL      },
2482         { NFSERR_SERVERFAULT,   -EREMOTEIO      },
2483         { NFSERR_BADTYPE,       -EBADTYPE       },
2484         { NFSERR_JUKEBOX,       -EJUKEBOX       },
2485         { -1,                   -EIO            }
2486 };
2487
2488 /**
2489  * nfs3_stat_to_errno - convert an NFS status code to a local errno
2490  * @status: NFS status code to convert
2491  *
2492  * Returns a local errno value, or -EIO if the NFS status code is
2493  * not recognized.  This function is used jointly by NFSv2 and NFSv3.
2494  */
2495 static int nfs3_stat_to_errno(enum nfs_stat status)
2496 {
2497         int i;
2498
2499         for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2500                 if (nfs_errtbl[i].stat == (int)status)
2501                         return nfs_errtbl[i].errno;
2502         }
2503         dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2504         return nfs_errtbl[i].errno;
2505 }
2506
2507
2508 #define PROC(proc, argtype, restype, timer)                             \
2509 [NFS3PROC_##proc] = {                                                   \
2510         .p_proc      = NFS3PROC_##proc,                                 \
2511         .p_encode    = nfs3_xdr_enc_##argtype##3args,                   \
2512         .p_decode    = nfs3_xdr_dec_##restype##3res,                    \
2513         .p_arglen    = NFS3_##argtype##args_sz,                         \
2514         .p_replen    = NFS3_##restype##res_sz,                          \
2515         .p_timer     = timer,                                           \
2516         .p_statidx   = NFS3PROC_##proc,                                 \
2517         .p_name      = #proc,                                           \
2518         }
2519
2520 const struct rpc_procinfo nfs3_procedures[] = {
2521         PROC(GETATTR,           getattr,        getattr,        1),
2522         PROC(SETATTR,           setattr,        setattr,        0),
2523         PROC(LOOKUP,            lookup,         lookup,         2),
2524         PROC(ACCESS,            access,         access,         1),
2525         PROC(READLINK,          readlink,       readlink,       3),
2526         PROC(READ,              read,           read,           3),
2527         PROC(WRITE,             write,          write,          4),
2528         PROC(CREATE,            create,         create,         0),
2529         PROC(MKDIR,             mkdir,          create,         0),
2530         PROC(SYMLINK,           symlink,        create,         0),
2531         PROC(MKNOD,             mknod,          create,         0),
2532         PROC(REMOVE,            remove,         remove,         0),
2533         PROC(RMDIR,             lookup,         setattr,        0),
2534         PROC(RENAME,            rename,         rename,         0),
2535         PROC(LINK,              link,           link,           0),
2536         PROC(READDIR,           readdir,        readdir,        3),
2537         PROC(READDIRPLUS,       readdirplus,    readdir,        3),
2538         PROC(FSSTAT,            getattr,        fsstat,         0),
2539         PROC(FSINFO,            getattr,        fsinfo,         0),
2540         PROC(PATHCONF,          getattr,        pathconf,       0),
2541         PROC(COMMIT,            commit,         commit,         5),
2542 };
2543
2544 static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)];
2545 const struct rpc_version nfs_version3 = {
2546         .number                 = 3,
2547         .nrprocs                = ARRAY_SIZE(nfs3_procedures),
2548         .procs                  = nfs3_procedures,
2549         .counts                 = nfs_version3_counts,
2550 };
2551
2552 #ifdef CONFIG_NFS_V3_ACL
2553 static const struct rpc_procinfo nfs3_acl_procedures[] = {
2554         [ACLPROC3_GETACL] = {
2555                 .p_proc = ACLPROC3_GETACL,
2556                 .p_encode = nfs3_xdr_enc_getacl3args,
2557                 .p_decode = nfs3_xdr_dec_getacl3res,
2558                 .p_arglen = ACL3_getaclargs_sz,
2559                 .p_replen = ACL3_getaclres_sz,
2560                 .p_timer = 1,
2561                 .p_name = "GETACL",
2562         },
2563         [ACLPROC3_SETACL] = {
2564                 .p_proc = ACLPROC3_SETACL,
2565                 .p_encode = nfs3_xdr_enc_setacl3args,
2566                 .p_decode = nfs3_xdr_dec_setacl3res,
2567                 .p_arglen = ACL3_setaclargs_sz,
2568                 .p_replen = ACL3_setaclres_sz,
2569                 .p_timer = 0,
2570                 .p_name = "SETACL",
2571         },
2572 };
2573
2574 static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)];
2575 const struct rpc_version nfsacl_version3 = {
2576         .number                 = 3,
2577         .nrprocs                = ARRAY_SIZE(nfs3_acl_procedures),
2578         .procs                  = nfs3_acl_procedures,
2579         .counts                 = nfs3_acl_counts,
2580 };
2581 #endif  /* CONFIG_NFS_V3_ACL */