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   1 /*
   2  *  fs/nfs/nfs4xdr.c
   3  *
   4  *  Server-side XDR for NFSv4
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * TODO: Neil Brown made the following observation:  We currently
  38  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  39  * never release any of that until the request is complete.
  40  * It would be good to calculate a new maximum response size while
  41  * decoding the COMPOUND, and call svc_reserve with this number
  42  * at the end of nfs4svc_decode_compoundargs.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/smp.h>
  47 #include <linux/fs.h>
  48 #include <linux/namei.h>
  49 #include <linux/vfs.h>
  50 #include <linux/sunrpc/xdr.h>
  51 #include <linux/sunrpc/svc.h>
  52 #include <linux/sunrpc/clnt.h>
  53 #include <linux/nfsd/nfsd.h>
  54 #include <linux/nfsd/state.h>
  55 #include <linux/nfsd/xdr4.h>
  56 #include <linux/nfsd_idmap.h>
  57 #include <linux/nfs4.h>
  58 #include <linux/nfs4_acl.h>
  59 #include <linux/sunrpc/gss_api.h>
  60 #include <linux/sunrpc/svcauth_gss.h>
  61
  62 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  63
  64 /*
  65  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  66  * directory in order to indicate to the client that a filesystem boundary is present
  67  * We use a fixed fsid for a referral
  68  */
  69 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  70 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  71
  72 static __be32
  73 check_filename(char *str, int len, __be32 err)
  74 {
  75         int i;
  76
  77         if (len == 0)
  78                 return nfserr_inval;
  79         if (isdotent(str, len))
  80                 return err;
  81         for (i = 0; i < len; i++)
  82                 if (str[i] == '/')
  83                         return err;
  84         return 0;
  85 }
  86
  87 /*
  88  * START OF "GENERIC" DECODE ROUTINES.
  89  *   These may look a little ugly since they are imported from a "generic"
  90  * set of XDR encode/decode routines which are intended to be shared by
  91  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  92  *
  93  * If the pain of reading these is too great, it should be a straightforward
  94  * task to translate them into Linux-specific versions which are more
  95  * consistent with the style used in NFSv2/v3...
  96  */
  97 #define DECODE_HEAD                             \
  98         __be32 *p;                              \
  99         __be32 status
 100 #define DECODE_TAIL                             \
 101         status = 0;                             \
 102 out:                                            \
 103         return status;                          \
 104 xdr_error:                                      \
 105         dprintk("NFSD: xdr error (%s:%d)\n",    \
 106                         __FILE__, __LINE__);    \
 107         status = nfserr_bad_xdr;                \
 108         goto out
 109
 110 #define READ32(x)         (x) = ntohl(*p++)
 111 #define READ64(x)         do {                  \
 112         (x) = (u64)ntohl(*p++) << 32;           \
 113         (x) |= ntohl(*p++);                     \
 114 } while (0)
 115 #define READTIME(x)       do {                  \
 116         p++;                                    \
 117         (x) = ntohl(*p++);                      \
 118         p++;                                    \
 119 } while (0)
 120 #define READMEM(x,nbytes) do {                  \
 121         x = (char *)p;                          \
 122         p += XDR_QUADLEN(nbytes);               \
 123 } while (0)
 124 #define SAVEMEM(x,nbytes) do {                  \
 125         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 126                 savemem(argp, p, nbytes) :      \
 127                 (char *)p)) {                   \
 128                 dprintk("NFSD: xdr error (%s:%d)\n", \
 129                                 __FILE__, __LINE__); \
 130                 goto xdr_error;                 \
 131                 }                               \
 132         p += XDR_QUADLEN(nbytes);               \
 133 } while (0)
 134 #define COPYMEM(x,nbytes) do {                  \
 135         memcpy((x), p, nbytes);                 \
 136         p += XDR_QUADLEN(nbytes);               \
 137 } while (0)
 138
 139 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 140 #define READ_BUF(nbytes)  do {                  \
 141         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 142                 p = argp->p;                    \
 143                 argp->p += XDR_QUADLEN(nbytes); \
 144         } else if (!(p = read_buf(argp, nbytes))) { \
 145                 dprintk("NFSD: xdr error (%s:%d)\n", \
 146                                 __FILE__, __LINE__); \
 147                 goto xdr_error;                 \
 148         }                                       \
 149 } while (0)
 150
 151 static __be32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
 152 {
 153         /* We want more bytes than seem to be available.
 154          * Maybe we need a new page, maybe we have just run out
 155          */
 156         int avail = (char*)argp->end - (char*)argp->p;
 157         __be32 *p;
 158         if (avail + argp->pagelen < nbytes)
 159                 return NULL;
 160         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 161                 return NULL;
 162         /* ok, we can do it with the current plus the next page */
 163         if (nbytes <= sizeof(argp->tmp))
 164                 p = argp->tmp;
 165         else {
 166                 kfree(argp->tmpp);
 167                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 168                 if (!p)
 169                         return NULL;
 170
 171         }
 172         memcpy(p, argp->p, avail);
 173         /* step to next page */
 174         argp->p = page_address(argp->pagelist[0]);
 175         argp->pagelist++;
 176         if (argp->pagelen < PAGE_SIZE) {
 177                 argp->end = p + (argp->pagelen>>2);
 178                 argp->pagelen = 0;
 179         } else {
 180                 argp->end = p + (PAGE_SIZE>>2);
 181                 argp->pagelen -= PAGE_SIZE;
 182         }
 183         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 184         argp->p += XDR_QUADLEN(nbytes - avail);
 185         return p;
 186 }
 187
 188 static int
 189 defer_free(struct nfsd4_compoundargs *argp,
 190                 void (*release)(const void *), void *p)
 191 {
 192         struct tmpbuf *tb;
 193
 194         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 195         if (!tb)
 196                 return -ENOMEM;
 197         tb->buf = p;
 198         tb->release = release;
 199         tb->next = argp->to_free;
 200         argp->to_free = tb;
 201         return 0;
 202 }
 203
 204 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 205 {
 206         if (p == argp->tmp) {
 207                 p = kmalloc(nbytes, GFP_KERNEL);
 208                 if (!p)
 209                         return NULL;
 210                 memcpy(p, argp->tmp, nbytes);
 211         } else {
 212                 BUG_ON(p != argp->tmpp);
 213                 argp->tmpp = NULL;
 214         }
 215         if (defer_free(argp, kfree, p)) {
 216                 kfree(p);
 217                 return NULL;
 218         } else
 219                 return (char *)p;
 220 }
 221
 222 static __be32
 223 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 224 {
 225         u32 bmlen;
 226         DECODE_HEAD;
 227
 228         bmval[0] = 0;
 229         bmval[1] = 0;
 230
 231         READ_BUF(4);
 232         READ32(bmlen);
 233         if (bmlen > 1000)
 234                 goto xdr_error;
 235
 236         READ_BUF(bmlen << 2);
 237         if (bmlen > 0)
 238                 READ32(bmval[0]);
 239         if (bmlen > 1)
 240                 READ32(bmval[1]);
 241
 242         DECODE_TAIL;
 243 }
 244
 245 static __be32
 246 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 247     struct nfs4_acl **acl)
 248 {
 249         int expected_len, len = 0;
 250         u32 dummy32;
 251         char *buf;
 252         int host_err;
 253
 254         DECODE_HEAD;
 255         iattr->ia_valid = 0;
 256         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 257                 return status;
 258
 259         /*
 260          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
 261          * read-only attributes return ERR_INVAL.
 262          */
 263         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 264                 return nfserr_attrnotsupp;
 265         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 266                 return nfserr_inval;
 267
 268         READ_BUF(4);
 269         READ32(expected_len);
 270
 271         if (bmval[0] & FATTR4_WORD0_SIZE) {
 272                 READ_BUF(8);
 273                 len += 8;
 274                 READ64(iattr->ia_size);
 275                 iattr->ia_valid |= ATTR_SIZE;
 276         }
 277         if (bmval[0] & FATTR4_WORD0_ACL) {
 278                 int nace;
 279                 struct nfs4_ace *ace;
 280
 281                 READ_BUF(4); len += 4;
 282                 READ32(nace);
 283
 284                 if (nace > NFS4_ACL_MAX)
 285                         return nfserr_resource;
 286
 287                 *acl = nfs4_acl_new(nace);
 288                 if (*acl == NULL) {
 289                         host_err = -ENOMEM;
 290                         goto out_nfserr;
 291                 }
 292                 defer_free(argp, kfree, *acl);
 293
 294                 (*acl)->naces = nace;
 295                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 296                         READ_BUF(16); len += 16;
 297                         READ32(ace->type);
 298                         READ32(ace->flag);
 299                         READ32(ace->access_mask);
 300                         READ32(dummy32);
 301                         READ_BUF(dummy32);
 302                         len += XDR_QUADLEN(dummy32) << 2;
 303                         READMEM(buf, dummy32);
 304                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 305                         host_err = 0;
 306                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 307                                 ace->who = 0;
 308                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 309                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 310                                                 buf, dummy32, &ace->who);
 311                         else
 312                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 313                                                 buf, dummy32, &ace->who);
 314                         if (host_err)
 315                                 goto out_nfserr;
 316                 }
 317         } else
 318                 *acl = NULL;
 319         if (bmval[1] & FATTR4_WORD1_MODE) {
 320                 READ_BUF(4);
 321                 len += 4;
 322                 READ32(iattr->ia_mode);
 323                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 324                 iattr->ia_valid |= ATTR_MODE;
 325         }
 326         if (bmval[1] & FATTR4_WORD1_OWNER) {
 327                 READ_BUF(4);
 328                 len += 4;
 329                 READ32(dummy32);
 330                 READ_BUF(dummy32);
 331                 len += (XDR_QUADLEN(dummy32) << 2);
 332                 READMEM(buf, dummy32);
 333                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 334                         goto out_nfserr;
 335                 iattr->ia_valid |= ATTR_UID;
 336         }
 337         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 338                 READ_BUF(4);
 339                 len += 4;
 340                 READ32(dummy32);
 341                 READ_BUF(dummy32);
 342                 len += (XDR_QUADLEN(dummy32) << 2);
 343                 READMEM(buf, dummy32);
 344                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 345                         goto out_nfserr;
 346                 iattr->ia_valid |= ATTR_GID;
 347         }
 348         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 349                 READ_BUF(4);
 350                 len += 4;
 351                 READ32(dummy32);
 352                 switch (dummy32) {
 353                 case NFS4_SET_TO_CLIENT_TIME:
 354                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 355                            all 32 bits of 'nseconds'. */
 356                         READ_BUF(12);
 357                         len += 12;
 358                         READ32(dummy32);
 359                         if (dummy32)
 360                                 return nfserr_inval;
 361                         READ32(iattr->ia_atime.tv_sec);
 362                         READ32(iattr->ia_atime.tv_nsec);
 363                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 364                                 return nfserr_inval;
 365                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 366                         break;
 367                 case NFS4_SET_TO_SERVER_TIME:
 368                         iattr->ia_valid |= ATTR_ATIME;
 369                         break;
 370                 default:
 371                         goto xdr_error;
 372                 }
 373         }
 374         if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
 375                 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 376                    all 32 bits of 'nseconds'. */
 377                 READ_BUF(12);
 378                 len += 12;
 379                 READ32(dummy32);
 380                 if (dummy32)
 381                         return nfserr_inval;
 382                 READ32(iattr->ia_ctime.tv_sec);
 383                 READ32(iattr->ia_ctime.tv_nsec);
 384                 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
 385                         return nfserr_inval;
 386                 iattr->ia_valid |= ATTR_CTIME;
 387         }
 388         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 389                 READ_BUF(4);
 390                 len += 4;
 391                 READ32(dummy32);
 392                 switch (dummy32) {
 393                 case NFS4_SET_TO_CLIENT_TIME:
 394                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 395                            all 32 bits of 'nseconds'. */
 396                         READ_BUF(12);
 397                         len += 12;
 398                         READ32(dummy32);
 399                         if (dummy32)
 400                                 return nfserr_inval;
 401                         READ32(iattr->ia_mtime.tv_sec);
 402                         READ32(iattr->ia_mtime.tv_nsec);
 403                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 404                                 return nfserr_inval;
 405                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 406                         break;
 407                 case NFS4_SET_TO_SERVER_TIME:
 408                         iattr->ia_valid |= ATTR_MTIME;
 409                         break;
 410                 default:
 411                         goto xdr_error;
 412                 }
 413         }
 414         if (len != expected_len)
 415                 goto xdr_error;
 416
 417         DECODE_TAIL;
 418
 419 out_nfserr:
 420         status = nfserrno(host_err);
 421         goto out;
 422 }
 423
 424 static __be32
 425 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 426 {
 427         DECODE_HEAD;
 428
 429         READ_BUF(4);
 430         READ32(access->ac_req_access);
 431
 432         DECODE_TAIL;
 433 }
 434
 435 static __be32
 436 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 437 {
 438         DECODE_HEAD;
 439
 440         close->cl_stateowner = NULL;
 441         READ_BUF(4 + sizeof(stateid_t));
 442         READ32(close->cl_seqid);
 443         READ32(close->cl_stateid.si_generation);
 444         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
 445
 446         DECODE_TAIL;
 447 }
 448
 449
 450 static __be32
 451 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 452 {
 453         DECODE_HEAD;
 454
 455         READ_BUF(12);
 456         READ64(commit->co_offset);
 457         READ32(commit->co_count);
 458
 459         DECODE_TAIL;
 460 }
 461
 462 static __be32
 463 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 464 {
 465         DECODE_HEAD;
 466
 467         READ_BUF(4);
 468         READ32(create->cr_type);
 469         switch (create->cr_type) {
 470         case NF4LNK:
 471                 READ_BUF(4);
 472                 READ32(create->cr_linklen);
 473                 READ_BUF(create->cr_linklen);
 474                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 475                 break;
 476         case NF4BLK:
 477         case NF4CHR:
 478                 READ_BUF(8);
 479                 READ32(create->cr_specdata1);
 480                 READ32(create->cr_specdata2);
 481                 break;
 482         case NF4SOCK:
 483         case NF4FIFO:
 484         case NF4DIR:
 485         default:
 486                 break;
 487         }
 488
 489         READ_BUF(4);
 490         READ32(create->cr_namelen);
 491         READ_BUF(create->cr_namelen);
 492         SAVEMEM(create->cr_name, create->cr_namelen);
 493         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 494                 return status;
 495
 496         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 497                 goto out;
 498
 499         DECODE_TAIL;
 500 }
 501
 502 static inline __be32
 503 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 504 {
 505         DECODE_HEAD;
 506
 507         READ_BUF(sizeof(stateid_t));
 508         READ32(dr->dr_stateid.si_generation);
 509         COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
 510
 511         DECODE_TAIL;
 512 }
 513
 514 static inline __be32
 515 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 516 {
 517         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 518 }
 519
 520 static __be32
 521 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 522 {
 523         DECODE_HEAD;
 524
 525         READ_BUF(4);
 526         READ32(link->li_namelen);
 527         READ_BUF(link->li_namelen);
 528         SAVEMEM(link->li_name, link->li_namelen);
 529         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 530                 return status;
 531
 532         DECODE_TAIL;
 533 }
 534
 535 static __be32
 536 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 537 {
 538         DECODE_HEAD;
 539
 540         lock->lk_replay_owner = NULL;
 541         /*
 542         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 543         */
 544         READ_BUF(28);
 545         READ32(lock->lk_type);
 546         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 547                 goto xdr_error;
 548         READ32(lock->lk_reclaim);
 549         READ64(lock->lk_offset);
 550         READ64(lock->lk_length);
 551         READ32(lock->lk_is_new);
 552
 553         if (lock->lk_is_new) {
 554                 READ_BUF(36);
 555                 READ32(lock->lk_new_open_seqid);
 556                 READ32(lock->lk_new_open_stateid.si_generation);
 557
 558                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
 559                 READ32(lock->lk_new_lock_seqid);
 560                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 561                 READ32(lock->lk_new_owner.len);
 562                 READ_BUF(lock->lk_new_owner.len);
 563                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 564         } else {
 565                 READ_BUF(20);
 566                 READ32(lock->lk_old_lock_stateid.si_generation);
 567                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
 568                 READ32(lock->lk_old_lock_seqid);
 569         }
 570
 571         DECODE_TAIL;
 572 }
 573
 574 static __be32
 575 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 576 {
 577         DECODE_HEAD;
 578
 579         READ_BUF(32);
 580         READ32(lockt->lt_type);
 581         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 582                 goto xdr_error;
 583         READ64(lockt->lt_offset);
 584         READ64(lockt->lt_length);
 585         COPYMEM(&lockt->lt_clientid, 8);
 586         READ32(lockt->lt_owner.len);
 587         READ_BUF(lockt->lt_owner.len);
 588         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 589
 590         DECODE_TAIL;
 591 }
 592
 593 static __be32
 594 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 595 {
 596         DECODE_HEAD;
 597
 598         locku->lu_stateowner = NULL;
 599         READ_BUF(24 + sizeof(stateid_t));
 600         READ32(locku->lu_type);
 601         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 602                 goto xdr_error;
 603         READ32(locku->lu_seqid);
 604         READ32(locku->lu_stateid.si_generation);
 605         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
 606         READ64(locku->lu_offset);
 607         READ64(locku->lu_length);
 608
 609         DECODE_TAIL;
 610 }
 611
 612 static __be32
 613 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 614 {
 615         DECODE_HEAD;
 616
 617         READ_BUF(4);
 618         READ32(lookup->lo_len);
 619         READ_BUF(lookup->lo_len);
 620         SAVEMEM(lookup->lo_name, lookup->lo_len);
 621         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 622                 return status;
 623
 624         DECODE_TAIL;
 625 }
 626
 627 static __be32
 628 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 629 {
 630         DECODE_HEAD;
 631
 632         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 633         open->op_iattr.ia_valid = 0;
 634         open->op_stateowner = NULL;
 635
 636         /* seqid, share_access, share_deny, clientid, ownerlen */
 637         READ_BUF(16 + sizeof(clientid_t));
 638         READ32(open->op_seqid);
 639         READ32(open->op_share_access);
 640         READ32(open->op_share_deny);
 641         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 642         READ32(open->op_owner.len);
 643
 644         /* owner, open_flag */
 645         READ_BUF(open->op_owner.len + 4);
 646         SAVEMEM(open->op_owner.data, open->op_owner.len);
 647         READ32(open->op_create);
 648         switch (open->op_create) {
 649         case NFS4_OPEN_NOCREATE:
 650                 break;
 651         case NFS4_OPEN_CREATE:
 652                 READ_BUF(4);
 653                 READ32(open->op_createmode);
 654                 switch (open->op_createmode) {
 655                 case NFS4_CREATE_UNCHECKED:
 656                 case NFS4_CREATE_GUARDED:
 657                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 658                                 goto out;
 659                         break;
 660                 case NFS4_CREATE_EXCLUSIVE:
 661                         READ_BUF(8);
 662                         COPYMEM(open->op_verf.data, 8);
 663                         break;
 664                 default:
 665                         goto xdr_error;
 666                 }
 667                 break;
 668         default:
 669                 goto xdr_error;
 670         }
 671
 672         /* open_claim */
 673         READ_BUF(4);
 674         READ32(open->op_claim_type);
 675         switch (open->op_claim_type) {
 676         case NFS4_OPEN_CLAIM_NULL:
 677         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 678                 READ_BUF(4);
 679                 READ32(open->op_fname.len);
 680                 READ_BUF(open->op_fname.len);
 681                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 682                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 683                         return status;
 684                 break;
 685         case NFS4_OPEN_CLAIM_PREVIOUS:
 686                 READ_BUF(4);
 687                 READ32(open->op_delegate_type);
 688                 break;
 689         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 690                 READ_BUF(sizeof(stateid_t) + 4);
 691                 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
 692                 READ32(open->op_fname.len);
 693                 READ_BUF(open->op_fname.len);
 694                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 695                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 696                         return status;
 697                 break;
 698         default:
 699                 goto xdr_error;
 700         }
 701
 702         DECODE_TAIL;
 703 }
 704
 705 static __be32
 706 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 707 {
 708         DECODE_HEAD;
 709
 710         open_conf->oc_stateowner = NULL;
 711         READ_BUF(4 + sizeof(stateid_t));
 712         READ32(open_conf->oc_req_stateid.si_generation);
 713         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
 714         READ32(open_conf->oc_seqid);
 715
 716         DECODE_TAIL;
 717 }
 718
 719 static __be32
 720 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 721 {
 722         DECODE_HEAD;
 723
 724         open_down->od_stateowner = NULL;
 725         READ_BUF(12 + sizeof(stateid_t));
 726         READ32(open_down->od_stateid.si_generation);
 727         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
 728         READ32(open_down->od_seqid);
 729         READ32(open_down->od_share_access);
 730         READ32(open_down->od_share_deny);
 731
 732         DECODE_TAIL;
 733 }
 734
 735 static __be32
 736 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 737 {
 738         DECODE_HEAD;
 739
 740         READ_BUF(4);
 741         READ32(putfh->pf_fhlen);
 742         if (putfh->pf_fhlen > NFS4_FHSIZE)
 743                 goto xdr_error;
 744         READ_BUF(putfh->pf_fhlen);
 745         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 746
 747         DECODE_TAIL;
 748 }
 749
 750 static __be32
 751 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 752 {
 753         DECODE_HEAD;
 754
 755         READ_BUF(sizeof(stateid_t) + 12);
 756         READ32(read->rd_stateid.si_generation);
 757         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
 758         READ64(read->rd_offset);
 759         READ32(read->rd_length);
 760
 761         DECODE_TAIL;
 762 }
 763
 764 static __be32
 765 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 766 {
 767         DECODE_HEAD;
 768
 769         READ_BUF(24);
 770         READ64(readdir->rd_cookie);
 771         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 772         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 773         READ32(readdir->rd_maxcount);
 774         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 775                 goto out;
 776
 777         DECODE_TAIL;
 778 }
 779
 780 static __be32
 781 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 782 {
 783         DECODE_HEAD;
 784
 785         READ_BUF(4);
 786         READ32(remove->rm_namelen);
 787         READ_BUF(remove->rm_namelen);
 788         SAVEMEM(remove->rm_name, remove->rm_namelen);
 789         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 790                 return status;
 791
 792         DECODE_TAIL;
 793 }
 794
 795 static __be32
 796 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 797 {
 798         DECODE_HEAD;
 799
 800         READ_BUF(4);
 801         READ32(rename->rn_snamelen);
 802         READ_BUF(rename->rn_snamelen + 4);
 803         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 804         READ32(rename->rn_tnamelen);
 805         READ_BUF(rename->rn_tnamelen);
 806         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 807         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 808                 return status;
 809         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 810                 return status;
 811
 812         DECODE_TAIL;
 813 }
 814
 815 static __be32
 816 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 817 {
 818         DECODE_HEAD;
 819
 820         READ_BUF(sizeof(clientid_t));
 821         COPYMEM(clientid, sizeof(clientid_t));
 822
 823         DECODE_TAIL;
 824 }
 825
 826 static __be32
 827 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 828                      struct nfsd4_secinfo *secinfo)
 829 {
 830         DECODE_HEAD;
 831
 832         READ_BUF(4);
 833         READ32(secinfo->si_namelen);
 834         READ_BUF(secinfo->si_namelen);
 835         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 836         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 837                                                                 nfserr_noent);
 838         if (status)
 839                 return status;
 840         DECODE_TAIL;
 841 }
 842
 843 static __be32
 844 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 845 {
 846         DECODE_HEAD;
 847
 848         READ_BUF(sizeof(stateid_t));
 849         READ32(setattr->sa_stateid.si_generation);
 850         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 851         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 852                 goto out;
 853
 854         DECODE_TAIL;
 855 }
 856
 857 static __be32
 858 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 859 {
 860         DECODE_HEAD;
 861
 862         READ_BUF(12);
 863         COPYMEM(setclientid->se_verf.data, 8);
 864         READ32(setclientid->se_namelen);
 865
 866         READ_BUF(setclientid->se_namelen + 8);
 867         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 868         READ32(setclientid->se_callback_prog);
 869         READ32(setclientid->se_callback_netid_len);
 870
 871         READ_BUF(setclientid->se_callback_netid_len + 4);
 872         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 873         READ32(setclientid->se_callback_addr_len);
 874
 875         READ_BUF(setclientid->se_callback_addr_len + 4);
 876         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 877         READ32(setclientid->se_callback_ident);
 878
 879         DECODE_TAIL;
 880 }
 881
 882 static __be32
 883 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 884 {
 885         DECODE_HEAD;
 886
 887         READ_BUF(8 + sizeof(nfs4_verifier));
 888         COPYMEM(&scd_c->sc_clientid, 8);
 889         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 890
 891         DECODE_TAIL;
 892 }
 893
 894 /* Also used for NVERIFY */
 895 static __be32
 896 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 897 {
 898 #if 0
 899         struct nfsd4_compoundargs save = {
 900                 .p = argp->p,
 901                 .end = argp->end,
 902                 .rqstp = argp->rqstp,
 903         };
 904         u32             ve_bmval[2];
 905         struct iattr    ve_iattr;           /* request */
 906         struct nfs4_acl *ve_acl;            /* request */
 907 #endif
 908         DECODE_HEAD;
 909
 910         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 911                 goto out;
 912
 913         /* For convenience's sake, we compare raw xdr'd attributes in
 914          * nfsd4_proc_verify; however we still decode here just to return
 915          * correct error in case of bad xdr. */
 916 #if 0
 917         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 918         if (status == nfserr_inval) {
 919                 status = nfserrno(status);
 920                 goto out;
 921         }
 922 #endif
 923         READ_BUF(4);
 924         READ32(verify->ve_attrlen);
 925         READ_BUF(verify->ve_attrlen);
 926         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 927
 928         DECODE_TAIL;
 929 }
 930
 931 static __be32
 932 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 933 {
 934         int avail;
 935         int v;
 936         int len;
 937         DECODE_HEAD;
 938
 939         READ_BUF(sizeof(stateid_opaque_t) + 20);
 940         READ32(write->wr_stateid.si_generation);
 941         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
 942         READ64(write->wr_offset);
 943         READ32(write->wr_stable_how);
 944         if (write->wr_stable_how > 2)
 945                 goto xdr_error;
 946         READ32(write->wr_buflen);
 947
 948         /* Sorry .. no magic macros for this.. *
 949          * READ_BUF(write->wr_buflen);
 950          * SAVEMEM(write->wr_buf, write->wr_buflen);
 951          */
 952         avail = (char*)argp->end - (char*)argp->p;
 953         if (avail + argp->pagelen < write->wr_buflen) {
 954                 dprintk("NFSD: xdr error (%s:%d)\n",
 955                                 __FILE__, __LINE__);
 956                 goto xdr_error;
 957         }
 958         argp->rqstp->rq_vec[0].iov_base = p;
 959         argp->rqstp->rq_vec[0].iov_len = avail;
 960         v = 0;
 961         len = write->wr_buflen;
 962         while (len > argp->rqstp->rq_vec[v].iov_len) {
 963                 len -= argp->rqstp->rq_vec[v].iov_len;
 964                 v++;
 965                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 966                 argp->pagelist++;
 967                 if (argp->pagelen >= PAGE_SIZE) {
 968                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 969                         argp->pagelen -= PAGE_SIZE;
 970                 } else {
 971                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 972                         argp->pagelen -= len;
 973                 }
 974         }
 975         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 976         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 977         argp->rqstp->rq_vec[v].iov_len = len;
 978         write->wr_vlen = v+1;
 979
 980         DECODE_TAIL;
 981 }
 982
 983 static __be32
 984 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 985 {
 986         DECODE_HEAD;
 987
 988         READ_BUF(12);
 989         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 990         READ32(rlockowner->rl_owner.len);
 991         READ_BUF(rlockowner->rl_owner.len);
 992         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 993
 994         DECODE_TAIL;
 995 }
 996
 997 static __be32
 998 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 999 {
1000         DECODE_HEAD;
1001         struct nfsd4_op *op;
1002         int i;
1003
1004         /*
1005          * XXX: According to spec, we should check the tag
1006          * for UTF-8 compliance.  I'm postponing this for
1007          * now because it seems that some clients do use
1008          * binary tags.
1009          */
1010         READ_BUF(4);
1011         READ32(argp->taglen);
1012         READ_BUF(argp->taglen + 8);
1013         SAVEMEM(argp->tag, argp->taglen);
1014         READ32(argp->minorversion);
1015         READ32(argp->opcnt);
1016
1017         if (argp->taglen > NFSD4_MAX_TAGLEN)
1018                 goto xdr_error;
1019         if (argp->opcnt > 100)
1020                 goto xdr_error;
1021
1022         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1023                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1024                 if (!argp->ops) {
1025                         argp->ops = argp->iops;
1026                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1027                         goto xdr_error;
1028                 }
1029         }
1030
1031         for (i = 0; i < argp->opcnt; i++) {
1032                 op = &argp->ops[i];
1033                 op->replay = NULL;
1034
1035                 /*
1036                  * We can't use READ_BUF() here because we need to handle
1037                  * a missing opcode as an OP_WRITE + 1. So we need to check
1038                  * to see if we're truly at the end of our buffer or if there
1039                  * is another page we need to flip to.
1040                  */
1041
1042                 if (argp->p == argp->end) {
1043                         if (argp->pagelen < 4) {
1044                                 /* There isn't an opcode still on the wire */
1045                                 op->opnum = OP_WRITE + 1;
1046                                 op->status = nfserr_bad_xdr;
1047                                 argp->opcnt = i+1;
1048                                 break;
1049                         }
1050
1051                         /*
1052                          * False alarm. We just hit a page boundary, but there
1053                          * is still data available.  Move pointer across page
1054                          * boundary.  *snip from READ_BUF*
1055                          */
1056                         argp->p = page_address(argp->pagelist[0]);
1057                         argp->pagelist++;
1058                         if (argp->pagelen < PAGE_SIZE) {
1059                                 argp->end = p + (argp->pagelen>>2);
1060                                 argp->pagelen = 0;
1061                         } else {
1062                                 argp->end = p + (PAGE_SIZE>>2);
1063                                 argp->pagelen -= PAGE_SIZE;
1064                         }
1065                 }
1066                 op->opnum = ntohl(*argp->p++);
1067
1068                 switch (op->opnum) {
1069                 case 2: /* Reserved operation */
1070                         op->opnum = OP_ILLEGAL;
1071                         if (argp->minorversion == 0)
1072                                 op->status = nfserr_op_illegal;
1073                         else
1074                                 op->status = nfserr_minor_vers_mismatch;
1075                         break;
1076                 case OP_ACCESS:
1077                         op->status = nfsd4_decode_access(argp, &op->u.access);
1078                         break;
1079                 case OP_CLOSE:
1080                         op->status = nfsd4_decode_close(argp, &op->u.close);
1081                         break;
1082                 case OP_COMMIT:
1083                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1084                         break;
1085                 case OP_CREATE:
1086                         op->status = nfsd4_decode_create(argp, &op->u.create);
1087                         break;
1088                 case OP_DELEGRETURN:
1089                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1090                         break;
1091                 case OP_GETATTR:
1092                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1093                         break;
1094                 case OP_GETFH:
1095                         op->status = nfs_ok;
1096                         break;
1097                 case OP_LINK:
1098                         op->status = nfsd4_decode_link(argp, &op->u.link);
1099                         break;
1100                 case OP_LOCK:
1101                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1102                         break;
1103                 case OP_LOCKT:
1104                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1105                         break;
1106                 case OP_LOCKU:
1107                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1108                         break;
1109                 case OP_LOOKUP:
1110                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1111                         break;
1112                 case OP_LOOKUPP:
1113                         op->status = nfs_ok;
1114                         break;
1115                 case OP_NVERIFY:
1116                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1117                         break;
1118                 case OP_OPEN:
1119                         op->status = nfsd4_decode_open(argp, &op->u.open);
1120                         break;
1121                 case OP_OPEN_CONFIRM:
1122                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1123                         break;
1124                 case OP_OPEN_DOWNGRADE:
1125                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1126                         break;
1127                 case OP_PUTFH:
1128                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1129                         break;
1130                 case OP_PUTROOTFH:
1131                         op->status = nfs_ok;
1132                         break;
1133                 case OP_READ:
1134                         op->status = nfsd4_decode_read(argp, &op->u.read);
1135                         break;
1136                 case OP_READDIR:
1137                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1138                         break;
1139                 case OP_READLINK:
1140                         op->status = nfs_ok;
1141                         break;
1142                 case OP_REMOVE:
1143                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1144                         break;
1145                 case OP_RENAME:
1146                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1147                         break;
1148                 case OP_RESTOREFH:
1149                         op->status = nfs_ok;
1150                         break;
1151                 case OP_RENEW:
1152                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1153                         break;
1154                 case OP_SAVEFH:
1155                         op->status = nfs_ok;
1156                         break;
1157                 case OP_SECINFO:
1158                         op->status = nfsd4_decode_secinfo(argp, &op->u.secinfo);
1159                         break;
1160                 case OP_SETATTR:
1161                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1162                         break;
1163                 case OP_SETCLIENTID:
1164                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1165                         break;
1166                 case OP_SETCLIENTID_CONFIRM:
1167                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1168                         break;
1169                 case OP_VERIFY:
1170                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1171                         break;
1172                 case OP_WRITE:
1173                         op->status = nfsd4_decode_write(argp, &op->u.write);
1174                         break;
1175                 case OP_RELEASE_LOCKOWNER:
1176                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1177                         break;
1178                 default:
1179                         op->opnum = OP_ILLEGAL;
1180                         op->status = nfserr_op_illegal;
1181                         break;
1182                 }
1183
1184                 if (op->status) {
1185                         argp->opcnt = i+1;
1186                         break;
1187                 }
1188         }
1189
1190         DECODE_TAIL;
1191 }
1192 /*
1193  * END OF "GENERIC" DECODE ROUTINES.
1194  */
1195
1196 /*
1197  * START OF "GENERIC" ENCODE ROUTINES.
1198  *   These may look a little ugly since they are imported from a "generic"
1199  * set of XDR encode/decode routines which are intended to be shared by
1200  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1201  *
1202  * If the pain of reading these is too great, it should be a straightforward
1203  * task to translate them into Linux-specific versions which are more
1204  * consistent with the style used in NFSv2/v3...
1205  */
1206 #define ENCODE_HEAD              __be32 *p
1207
1208 #define WRITE32(n)               *p++ = htonl(n)
1209 #define WRITE64(n)               do {                           \
1210         *p++ = htonl((u32)((n) >> 32));                         \
1211         *p++ = htonl((u32)(n));                                 \
1212 } while (0)
1213 #define WRITEMEM(ptr,nbytes)     do {                           \
1214         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1215         memcpy(p, ptr, nbytes);                                 \
1216         p += XDR_QUADLEN(nbytes);                               \
1217 } while (0)
1218 #define WRITECINFO(c)           do {                            \
1219         *p++ = htonl(c.atomic);                                 \
1220         *p++ = htonl(c.before_ctime_sec);                               \
1221         *p++ = htonl(c.before_ctime_nsec);                              \
1222         *p++ = htonl(c.after_ctime_sec);                                \
1223         *p++ = htonl(c.after_ctime_nsec);                               \
1224 } while (0)
1225
1226 #define RESERVE_SPACE(nbytes)   do {                            \
1227         p = resp->p;                                            \
1228         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1229 } while (0)
1230 #define ADJUST_ARGS()           resp->p = p
1231
1232 /*
1233  * Header routine to setup seqid operation replay cache
1234  */
1235 #define ENCODE_SEQID_OP_HEAD                                    \
1236         __be32 *p;                                              \
1237         __be32 *save;                                           \
1238                                                                 \
1239         save = resp->p;
1240
1241 /*
1242  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1243  * is where sequence id's are incremented, and the replay cache is filled.
1244  * Note that we increment sequence id's here, at the last moment, so we're sure
1245  * we know whether the error to be returned is a sequence id mutating error.
1246  */
1247
1248 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1249         if (seqid_mutating_err(nfserr) && stateowner) {         \
1250                 stateowner->so_seqid++;                         \
1251                 stateowner->so_replay.rp_status = nfserr;       \
1252                 stateowner->so_replay.rp_buflen =               \
1253                           (((char *)(resp)->p - (char *)save)); \
1254                 memcpy(stateowner->so_replay.rp_buf, save,      \
1255                         stateowner->so_replay.rp_buflen);       \
1256         } } while (0);
1257
1258 /* Encode as an array of strings the string given with components
1259  * seperated @sep.
1260  */
1261 static __be32 nfsd4_encode_components(char sep, char *components,
1262                                    __be32 **pp, int *buflen)
1263 {
1264         __be32 *p = *pp;
1265         __be32 *countp = p;
1266         int strlen, count=0;
1267         char *str, *end;
1268
1269         dprintk("nfsd4_encode_components(%s)\n", components);
1270         if ((*buflen -= 4) < 0)
1271                 return nfserr_resource;
1272         WRITE32(0); /* We will fill this in with @count later */
1273         end = str = components;
1274         while (*end) {
1275                 for (; *end && (*end != sep); end++)
1276                         ; /* Point to end of component */
1277                 strlen = end - str;
1278                 if (strlen) {
1279                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1280                                 return nfserr_resource;
1281                         WRITE32(strlen);
1282                         WRITEMEM(str, strlen);
1283                         count++;
1284                 }
1285                 else
1286                         end++;
1287                 str = end;
1288         }
1289         *pp = p;
1290         p = countp;
1291         WRITE32(count);
1292         return 0;
1293 }
1294
1295 /*
1296  * encode a location element of a fs_locations structure
1297  */
1298 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1299                                     __be32 **pp, int *buflen)
1300 {
1301         __be32 status;
1302         __be32 *p = *pp;
1303
1304         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1305         if (status)
1306                 return status;
1307         status = nfsd4_encode_components('/', location->path, &p, buflen);
1308         if (status)
1309                 return status;
1310         *pp = p;
1311         return 0;
1312 }
1313
1314 /*
1315  * Return the path to an export point in the pseudo filesystem namespace
1316  * Returned string is safe to use as long as the caller holds a reference
1317  * to @exp.
1318  */
1319 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1320 {
1321         struct svc_fh tmp_fh;
1322         char *path, *rootpath;
1323
1324         fh_init(&tmp_fh, NFS4_FHSIZE);
1325         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1326         if (*stat)
1327                 return NULL;
1328         rootpath = tmp_fh.fh_export->ex_path;
1329
1330         path = exp->ex_path;
1331
1332         if (strncmp(path, rootpath, strlen(rootpath))) {
1333                 dprintk("nfsd: fs_locations failed;"
1334                         "%s is not contained in %s\n", path, rootpath);
1335                 *stat = nfserr_notsupp;
1336                 return NULL;
1337         }
1338
1339         return path + strlen(rootpath);
1340 }
1341
1342 /*
1343  *  encode a fs_locations structure
1344  */
1345 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1346                                      struct svc_export *exp,
1347                                      __be32 **pp, int *buflen)
1348 {
1349         __be32 status;
1350         int i;
1351         __be32 *p = *pp;
1352         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1353         char *root = nfsd4_path(rqstp, exp, &status);
1354
1355         if (status)
1356                 return status;
1357         status = nfsd4_encode_components('/', root, &p, buflen);
1358         if (status)
1359                 return status;
1360         if ((*buflen -= 4) < 0)
1361                 return nfserr_resource;
1362         WRITE32(fslocs->locations_count);
1363         for (i=0; i<fslocs->locations_count; i++) {
1364                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1365                                                    &p, buflen);
1366                 if (status)
1367                         return status;
1368         }
1369         *pp = p;
1370         return 0;
1371 }
1372
1373 static u32 nfs4_ftypes[16] = {
1374         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1375         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1376         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1377         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1378 };
1379
1380 static __be32
1381 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1382                         __be32 **p, int *buflen)
1383 {
1384         int status;
1385
1386         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1387                 return nfserr_resource;
1388         if (whotype != NFS4_ACL_WHO_NAMED)
1389                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1390         else if (group)
1391                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1392         else
1393                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1394         if (status < 0)
1395                 return nfserrno(status);
1396         *p = xdr_encode_opaque(*p, NULL, status);
1397         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1398         BUG_ON(*buflen < 0);
1399         return 0;
1400 }
1401
1402 static inline __be32
1403 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1404 {
1405         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1406 }
1407
1408 static inline __be32
1409 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1410 {
1411         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1412 }
1413
1414 static inline __be32
1415 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1416                 __be32 **p, int *buflen)
1417 {
1418         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1419 }
1420
1421 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1422                               FATTR4_WORD0_RDATTR_ERROR)
1423 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1424
1425 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1426 {
1427         /* As per referral draft:  */
1428         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1429             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1430                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1431                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1432                         *rdattr_err = NFSERR_MOVED;
1433                 else
1434                         return nfserr_moved;
1435         }
1436         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1437         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1438         return 0;
1439 }
1440
1441 /*
1442  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1443  * ourselves.
1444  *
1445  * @countp is the buffer size in _words_; upon successful return this becomes
1446  * replaced with the number of words written.
1447  */
1448 __be32
1449 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1450                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1451                 struct svc_rqst *rqstp)
1452 {
1453         u32 bmval0 = bmval[0];
1454         u32 bmval1 = bmval[1];
1455         struct kstat stat;
1456         struct svc_fh tempfh;
1457         struct kstatfs statfs;
1458         int buflen = *countp << 2;
1459         __be32 *attrlenp;
1460         u32 dummy;
1461         u64 dummy64;
1462         u32 rdattr_err = 0;
1463         __be32 *p = buffer;
1464         __be32 status;
1465         int err;
1466         int aclsupport = 0;
1467         struct nfs4_acl *acl = NULL;
1468
1469         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1470         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1471         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1472
1473         if (exp->ex_fslocs.migrated) {
1474                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1475                 if (status)
1476                         goto out;
1477         }
1478
1479         err = vfs_getattr(exp->ex_mnt, dentry, &stat);
1480         if (err)
1481                 goto out_nfserr;
1482         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1483                         FATTR4_WORD0_MAXNAME)) ||
1484             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1485                        FATTR4_WORD1_SPACE_TOTAL))) {
1486                 err = vfs_statfs(dentry, &statfs);
1487                 if (err)
1488                         goto out_nfserr;
1489         }
1490         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1491                 fh_init(&tempfh, NFS4_FHSIZE);
1492                 status = fh_compose(&tempfh, exp, dentry, NULL);
1493                 if (status)
1494                         goto out;
1495                 fhp = &tempfh;
1496         }
1497         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1498                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1499                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1500                 aclsupport = (err == 0);
1501                 if (bmval0 & FATTR4_WORD0_ACL) {
1502                         if (err == -EOPNOTSUPP)
1503                                 bmval0 &= ~FATTR4_WORD0_ACL;
1504                         else if (err == -EINVAL) {
1505                                 status = nfserr_attrnotsupp;
1506                                 goto out;
1507                         } else if (err != 0)
1508                                 goto out_nfserr;
1509                 }
1510         }
1511         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1512                 if (exp->ex_fslocs.locations == NULL) {
1513                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1514                 }
1515         }
1516         if ((buflen -= 16) < 0)
1517                 goto out_resource;
1518
1519         WRITE32(2);
1520         WRITE32(bmval0);
1521         WRITE32(bmval1);
1522         attrlenp = p++;                /* to be backfilled later */
1523
1524         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1525                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1526                 if ((buflen -= 12) < 0)
1527                         goto out_resource;
1528                 if (!aclsupport)
1529                         word0 &= ~FATTR4_WORD0_ACL;
1530                 if (!exp->ex_fslocs.locations)
1531                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1532                 WRITE32(2);
1533                 WRITE32(word0);
1534                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1535         }
1536         if (bmval0 & FATTR4_WORD0_TYPE) {
1537                 if ((buflen -= 4) < 0)
1538                         goto out_resource;
1539                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1540                 if (dummy == NF4BAD)
1541                         goto out_serverfault;
1542                 WRITE32(dummy);
1543         }
1544         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1545                 if ((buflen -= 4) < 0)
1546                         goto out_resource;
1547                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1548                         WRITE32(NFS4_FH_PERSISTENT);
1549                 else
1550                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1551         }
1552         if (bmval0 & FATTR4_WORD0_CHANGE) {
1553                 /*
1554                  * Note: This _must_ be consistent with the scheme for writing
1555                  * change_info, so any changes made here must be reflected there
1556                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1557                  * macro above.)
1558                  */
1559                 if ((buflen -= 8) < 0)
1560                         goto out_resource;
1561                 WRITE32(stat.ctime.tv_sec);
1562                 WRITE32(stat.ctime.tv_nsec);
1563         }
1564         if (bmval0 & FATTR4_WORD0_SIZE) {
1565                 if ((buflen -= 8) < 0)
1566                         goto out_resource;
1567                 WRITE64(stat.size);
1568         }
1569         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1570                 if ((buflen -= 4) < 0)
1571                         goto out_resource;
1572                 WRITE32(1);
1573         }
1574         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1575                 if ((buflen -= 4) < 0)
1576                         goto out_resource;
1577                 WRITE32(1);
1578         }
1579         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1580                 if ((buflen -= 4) < 0)
1581                         goto out_resource;
1582                 WRITE32(0);
1583         }
1584         if (bmval0 & FATTR4_WORD0_FSID) {
1585                 if ((buflen -= 16) < 0)
1586                         goto out_resource;
1587                 if (exp->ex_fslocs.migrated) {
1588                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1589                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1590                 } else switch(fsid_source(fhp)) {
1591                 case FSIDSOURCE_FSID:
1592                         WRITE64((u64)exp->ex_fsid);
1593                         WRITE64((u64)0);
1594                         break;
1595                 case FSIDSOURCE_DEV:
1596                         WRITE32(0);
1597                         WRITE32(MAJOR(stat.dev));
1598                         WRITE32(0);
1599                         WRITE32(MINOR(stat.dev));
1600                         break;
1601                 case FSIDSOURCE_UUID:
1602                         WRITEMEM(exp->ex_uuid, 16);
1603                         break;
1604                 }
1605         }
1606         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1607                 if ((buflen -= 4) < 0)
1608                         goto out_resource;
1609                 WRITE32(0);
1610         }
1611         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1612                 if ((buflen -= 4) < 0)
1613                         goto out_resource;
1614                 WRITE32(NFSD_LEASE_TIME);
1615         }
1616         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1617                 if ((buflen -= 4) < 0)
1618                         goto out_resource;
1619                 WRITE32(rdattr_err);
1620         }
1621         if (bmval0 & FATTR4_WORD0_ACL) {
1622                 struct nfs4_ace *ace;
1623
1624                 if (acl == NULL) {
1625                         if ((buflen -= 4) < 0)
1626                                 goto out_resource;
1627
1628                         WRITE32(0);
1629                         goto out_acl;
1630                 }
1631                 if ((buflen -= 4) < 0)
1632                         goto out_resource;
1633                 WRITE32(acl->naces);
1634
1635                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1636                         if ((buflen -= 4*3) < 0)
1637                                 goto out_resource;
1638                         WRITE32(ace->type);
1639                         WRITE32(ace->flag);
1640                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1641                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1642                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1643                                 &p, &buflen);
1644                         if (status == nfserr_resource)
1645                                 goto out_resource;
1646                         if (status)
1647                                 goto out;
1648                 }
1649         }
1650 out_acl:
1651         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1652                 if ((buflen -= 4) < 0)
1653                         goto out_resource;
1654                 WRITE32(aclsupport ?
1655                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1656         }
1657         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1658                 if ((buflen -= 4) < 0)
1659                         goto out_resource;
1660                 WRITE32(1);
1661         }
1662         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1663                 if ((buflen -= 4) < 0)
1664                         goto out_resource;
1665                 WRITE32(1);
1666         }
1667         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1668                 if ((buflen -= 4) < 0)
1669                         goto out_resource;
1670                 WRITE32(1);
1671         }
1672         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1673                 if ((buflen -= 4) < 0)
1674                         goto out_resource;
1675                 WRITE32(1);
1676         }
1677         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1678                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1679                 if (buflen < 0)
1680                         goto out_resource;
1681                 WRITE32(fhp->fh_handle.fh_size);
1682                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1683         }
1684         if (bmval0 & FATTR4_WORD0_FILEID) {
1685                 if ((buflen -= 8) < 0)
1686                         goto out_resource;
1687                 WRITE64(stat.ino);
1688         }
1689         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1690                 if ((buflen -= 8) < 0)
1691                         goto out_resource;
1692                 WRITE64((u64) statfs.f_ffree);
1693         }
1694         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1695                 if ((buflen -= 8) < 0)
1696                         goto out_resource;
1697                 WRITE64((u64) statfs.f_ffree);
1698         }
1699         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1700                 if ((buflen -= 8) < 0)
1701                         goto out_resource;
1702                 WRITE64((u64) statfs.f_files);
1703         }
1704         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1705                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1706                 if (status == nfserr_resource)
1707                         goto out_resource;
1708                 if (status)
1709                         goto out;
1710         }
1711         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1712                 if ((buflen -= 4) < 0)
1713                         goto out_resource;
1714                 WRITE32(1);
1715         }
1716         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1717                 if ((buflen -= 8) < 0)
1718                         goto out_resource;
1719                 WRITE64(~(u64)0);
1720         }
1721         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1722                 if ((buflen -= 4) < 0)
1723                         goto out_resource;
1724                 WRITE32(255);
1725         }
1726         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1727                 if ((buflen -= 4) < 0)
1728                         goto out_resource;
1729                 WRITE32(statfs.f_namelen);
1730         }
1731         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1732                 if ((buflen -= 8) < 0)
1733                         goto out_resource;
1734                 WRITE64((u64) svc_max_payload(rqstp));
1735         }
1736         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1737                 if ((buflen -= 8) < 0)
1738                         goto out_resource;
1739                 WRITE64((u64) svc_max_payload(rqstp));
1740         }
1741         if (bmval1 & FATTR4_WORD1_MODE) {
1742                 if ((buflen -= 4) < 0)
1743                         goto out_resource;
1744                 WRITE32(stat.mode & S_IALLUGO);
1745         }
1746         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1747                 if ((buflen -= 4) < 0)
1748                         goto out_resource;
1749                 WRITE32(1);
1750         }
1751         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1752                 if ((buflen -= 4) < 0)
1753                         goto out_resource;
1754                 WRITE32(stat.nlink);
1755         }
1756         if (bmval1 & FATTR4_WORD1_OWNER) {
1757                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1758                 if (status == nfserr_resource)
1759                         goto out_resource;
1760                 if (status)
1761                         goto out;
1762         }
1763         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1764                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1765                 if (status == nfserr_resource)
1766                         goto out_resource;
1767                 if (status)
1768                         goto out;
1769         }
1770         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1771                 if ((buflen -= 8) < 0)
1772                         goto out_resource;
1773                 WRITE32((u32) MAJOR(stat.rdev));
1774                 WRITE32((u32) MINOR(stat.rdev));
1775         }
1776         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1777                 if ((buflen -= 8) < 0)
1778                         goto out_resource;
1779                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1780                 WRITE64(dummy64);
1781         }
1782         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1783                 if ((buflen -= 8) < 0)
1784                         goto out_resource;
1785                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1786                 WRITE64(dummy64);
1787         }
1788         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1789                 if ((buflen -= 8) < 0)
1790                         goto out_resource;
1791                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1792                 WRITE64(dummy64);
1793         }
1794         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1795                 if ((buflen -= 8) < 0)
1796                         goto out_resource;
1797                 dummy64 = (u64)stat.blocks << 9;
1798                 WRITE64(dummy64);
1799         }
1800         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1801                 if ((buflen -= 12) < 0)
1802                         goto out_resource;
1803                 WRITE32(0);
1804                 WRITE32(stat.atime.tv_sec);
1805                 WRITE32(stat.atime.tv_nsec);
1806         }
1807         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1808                 if ((buflen -= 12) < 0)
1809                         goto out_resource;
1810                 WRITE32(0);
1811                 WRITE32(1);
1812                 WRITE32(0);
1813         }
1814         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1815                 if ((buflen -= 12) < 0)
1816                         goto out_resource;
1817                 WRITE32(0);
1818                 WRITE32(stat.ctime.tv_sec);
1819                 WRITE32(stat.ctime.tv_nsec);
1820         }
1821         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1822                 if ((buflen -= 12) < 0)
1823                         goto out_resource;
1824                 WRITE32(0);
1825                 WRITE32(stat.mtime.tv_sec);
1826                 WRITE32(stat.mtime.tv_nsec);
1827         }
1828         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1829                 if ((buflen -= 8) < 0)
1830                         goto out_resource;
1831                 if (exp->ex_mnt->mnt_root->d_inode == dentry->d_inode) {
1832                         err = vfs_getattr(exp->ex_mnt->mnt_parent,
1833                                 exp->ex_mnt->mnt_mountpoint, &stat);
1834                         if (err)
1835                                 goto out_nfserr;
1836                 }
1837                 WRITE64(stat.ino);
1838         }
1839         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1840         *countp = p - buffer;
1841         status = nfs_ok;
1842
1843 out:
1844         kfree(acl);
1845         if (fhp == &tempfh)
1846                 fh_put(&tempfh);
1847         return status;
1848 out_nfserr:
1849         status = nfserrno(err);
1850         goto out;
1851 out_resource:
1852         *countp = 0;
1853         status = nfserr_resource;
1854         goto out;
1855 out_serverfault:
1856         status = nfserr_serverfault;
1857         goto out;
1858 }
1859
1860 static __be32
1861 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1862                 const char *name, int namlen, __be32 *p, int *buflen)
1863 {
1864         struct svc_export *exp = cd->rd_fhp->fh_export;
1865         struct dentry *dentry;
1866         __be32 nfserr;
1867
1868         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1869         if (IS_ERR(dentry))
1870                 return nfserrno(PTR_ERR(dentry));
1871
1872         exp_get(exp);
1873         if (d_mountpoint(dentry)) {
1874                 int err;
1875
1876                 /*
1877                  * Why the heck aren't we just using nfsd_lookup??
1878                  * Different "."/".." handling?  Something else?
1879                  * At least, add a comment here to explain....
1880                  */
1881                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1882                 if (err) {
1883                         nfserr = nfserrno(err);
1884                         goto out_put;
1885                 }
1886                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
1887                 if (nfserr)
1888                         goto out_put;
1889
1890         }
1891         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1892                                         cd->rd_rqstp);
1893 out_put:
1894         dput(dentry);
1895         exp_put(exp);
1896         return nfserr;
1897 }
1898
1899 static __be32 *
1900 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1901 {
1902         __be32 *attrlenp;
1903
1904         if (buflen < 6)
1905                 return NULL;
1906         *p++ = htonl(2);
1907         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1908         *p++ = htonl(0);                         /* bmval1 */
1909
1910         attrlenp = p++;
1911         *p++ = nfserr;       /* no htonl */
1912         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1913         return p;
1914 }
1915
1916 static int
1917 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1918                     loff_t offset, u64 ino, unsigned int d_type)
1919 {
1920         struct readdir_cd *ccd = ccdv;
1921         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1922         int buflen;
1923         __be32 *p = cd->buffer;
1924         __be32 nfserr = nfserr_toosmall;
1925
1926         /* In nfsv4, "." and ".." never make it onto the wire.. */
1927         if (name && isdotent(name, namlen)) {
1928                 cd->common.err = nfs_ok;
1929                 return 0;
1930         }
1931
1932         if (cd->offset)
1933                 xdr_encode_hyper(cd->offset, (u64) offset);
1934
1935         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1936         if (buflen < 0)
1937                 goto fail;
1938
1939         *p++ = xdr_one;                             /* mark entry present */
1940         cd->offset = p;                             /* remember pointer */
1941         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1942         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1943
1944         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1945         switch (nfserr) {
1946         case nfs_ok:
1947                 p += buflen;
1948                 break;
1949         case nfserr_resource:
1950                 nfserr = nfserr_toosmall;
1951                 goto fail;
1952         case nfserr_dropit:
1953                 goto fail;
1954         default:
1955                 /*
1956                  * If the client requested the RDATTR_ERROR attribute,
1957                  * we stuff the error code into this attribute
1958                  * and continue.  If this attribute was not requested,
1959                  * then in accordance with the spec, we fail the
1960                  * entire READDIR operation(!)
1961                  */
1962                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1963                         goto fail;
1964                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1965                 if (p == NULL) {
1966                         nfserr = nfserr_toosmall;
1967                         goto fail;
1968                 }
1969         }
1970         cd->buflen -= (p - cd->buffer);
1971         cd->buffer = p;
1972         cd->common.err = nfs_ok;
1973         return 0;
1974 fail:
1975         cd->common.err = nfserr;
1976         return -EINVAL;
1977 }
1978
1979 static void
1980 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1981 {
1982         ENCODE_HEAD;
1983
1984         if (!nfserr) {
1985                 RESERVE_SPACE(8);
1986                 WRITE32(access->ac_supported);
1987                 WRITE32(access->ac_resp_access);
1988                 ADJUST_ARGS();
1989         }
1990 }
1991
1992 static void
1993 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1994 {
1995         ENCODE_SEQID_OP_HEAD;
1996
1997         if (!nfserr) {
1998                 RESERVE_SPACE(sizeof(stateid_t));
1999                 WRITE32(close->cl_stateid.si_generation);
2000                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
2001                 ADJUST_ARGS();
2002         }
2003         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2004 }
2005
2006
2007 static void
2008 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2009 {
2010         ENCODE_HEAD;
2011
2012         if (!nfserr) {
2013                 RESERVE_SPACE(8);
2014                 WRITEMEM(commit->co_verf.data, 8);
2015                 ADJUST_ARGS();
2016         }
2017 }
2018
2019 static void
2020 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2021 {
2022         ENCODE_HEAD;
2023
2024         if (!nfserr) {
2025                 RESERVE_SPACE(32);
2026                 WRITECINFO(create->cr_cinfo);
2027                 WRITE32(2);
2028                 WRITE32(create->cr_bmval[0]);
2029                 WRITE32(create->cr_bmval[1]);
2030                 ADJUST_ARGS();
2031         }
2032 }
2033
2034 static __be32
2035 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2036 {
2037         struct svc_fh *fhp = getattr->ga_fhp;
2038         int buflen;
2039
2040         if (nfserr)
2041                 return nfserr;
2042
2043         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2044         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2045                                     resp->p, &buflen, getattr->ga_bmval,
2046                                     resp->rqstp);
2047         if (!nfserr)
2048                 resp->p += buflen;
2049         return nfserr;
2050 }
2051
2052 static void
2053 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh *fhp)
2054 {
2055         unsigned int len;
2056         ENCODE_HEAD;
2057
2058         if (!nfserr) {
2059                 len = fhp->fh_handle.fh_size;
2060                 RESERVE_SPACE(len + 4);
2061                 WRITE32(len);
2062                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2063                 ADJUST_ARGS();
2064         }
2065 }
2066
2067 /*
2068 * Including all fields other than the name, a LOCK4denied structure requires
2069 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2070 */
2071 static void
2072 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2073 {
2074         ENCODE_HEAD;
2075
2076         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2077         WRITE64(ld->ld_start);
2078         WRITE64(ld->ld_length);
2079         WRITE32(ld->ld_type);
2080         if (ld->ld_sop) {
2081                 WRITEMEM(&ld->ld_clientid, 8);
2082                 WRITE32(ld->ld_sop->so_owner.len);
2083                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2084                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2085         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2086                 WRITE64((u64)0); /* clientid */
2087                 WRITE32(0); /* length of owner name */
2088         }
2089         ADJUST_ARGS();
2090 }
2091
2092 static void
2093 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2094 {
2095         ENCODE_SEQID_OP_HEAD;
2096
2097         if (!nfserr) {
2098                 RESERVE_SPACE(4 + sizeof(stateid_t));
2099                 WRITE32(lock->lk_resp_stateid.si_generation);
2100                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2101                 ADJUST_ARGS();
2102         } else if (nfserr == nfserr_denied)
2103                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2104
2105         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2106 }
2107
2108 static void
2109 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2110 {
2111         if (nfserr == nfserr_denied)
2112                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2113 }
2114
2115 static void
2116 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2117 {
2118         ENCODE_SEQID_OP_HEAD;
2119
2120         if (!nfserr) {
2121                 RESERVE_SPACE(sizeof(stateid_t));
2122                 WRITE32(locku->lu_stateid.si_generation);
2123                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2124                 ADJUST_ARGS();
2125         }
2126
2127         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2128 }
2129
2130
2131 static void
2132 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2133 {
2134         ENCODE_HEAD;
2135
2136         if (!nfserr) {
2137                 RESERVE_SPACE(20);
2138                 WRITECINFO(link->li_cinfo);
2139                 ADJUST_ARGS();
2140         }
2141 }
2142
2143
2144 static void
2145 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2146 {
2147         ENCODE_SEQID_OP_HEAD;
2148
2149         if (nfserr)
2150                 goto out;
2151
2152         RESERVE_SPACE(36 + sizeof(stateid_t));
2153         WRITE32(open->op_stateid.si_generation);
2154         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2155         WRITECINFO(open->op_cinfo);
2156         WRITE32(open->op_rflags);
2157         WRITE32(2);
2158         WRITE32(open->op_bmval[0]);
2159         WRITE32(open->op_bmval[1]);
2160         WRITE32(open->op_delegate_type);
2161         ADJUST_ARGS();
2162
2163         switch (open->op_delegate_type) {
2164         case NFS4_OPEN_DELEGATE_NONE:
2165                 break;
2166         case NFS4_OPEN_DELEGATE_READ:
2167                 RESERVE_SPACE(20 + sizeof(stateid_t));
2168                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2169                 WRITE32(open->op_recall);
2170
2171                 /*
2172                  * TODO: ACE's in delegations
2173                  */
2174                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2175                 WRITE32(0);
2176                 WRITE32(0);
2177                 WRITE32(0);   /* XXX: is NULL principal ok? */
2178                 ADJUST_ARGS();
2179                 break;
2180         case NFS4_OPEN_DELEGATE_WRITE:
2181                 RESERVE_SPACE(32 + sizeof(stateid_t));
2182                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2183                 WRITE32(0);
2184
2185                 /*
2186                  * TODO: space_limit's in delegations
2187                  */
2188                 WRITE32(NFS4_LIMIT_SIZE);
2189                 WRITE32(~(u32)0);
2190                 WRITE32(~(u32)0);
2191
2192                 /*
2193                  * TODO: ACE's in delegations
2194                  */
2195                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2196                 WRITE32(0);
2197                 WRITE32(0);
2198                 WRITE32(0);   /* XXX: is NULL principal ok? */
2199                 ADJUST_ARGS();
2200                 break;
2201         default:
2202                 BUG();
2203         }
2204         /* XXX save filehandle here */
2205 out:
2206         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2207 }
2208
2209 static void
2210 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2211 {
2212         ENCODE_SEQID_OP_HEAD;
2213
2214         if (!nfserr) {
2215                 RESERVE_SPACE(sizeof(stateid_t));
2216                 WRITE32(oc->oc_resp_stateid.si_generation);
2217                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2218                 ADJUST_ARGS();
2219         }
2220
2221         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2222 }
2223
2224 static void
2225 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2226 {
2227         ENCODE_SEQID_OP_HEAD;
2228
2229         if (!nfserr) {
2230                 RESERVE_SPACE(sizeof(stateid_t));
2231                 WRITE32(od->od_stateid.si_generation);
2232                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2233                 ADJUST_ARGS();
2234         }
2235
2236         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2237 }
2238
2239 static __be32
2240 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2241                   struct nfsd4_read *read)
2242 {
2243         u32 eof;
2244         int v, pn;
2245         unsigned long maxcount;
2246         long len;
2247         ENCODE_HEAD;
2248
2249         if (nfserr)
2250                 return nfserr;
2251         if (resp->xbuf->page_len)
2252                 return nfserr_resource;
2253
2254         RESERVE_SPACE(8); /* eof flag and byte count */
2255
2256         maxcount = svc_max_payload(resp->rqstp);
2257         if (maxcount > read->rd_length)
2258                 maxcount = read->rd_length;
2259
2260         len = maxcount;
2261         v = 0;
2262         while (len > 0) {
2263                 pn = resp->rqstp->rq_resused++;
2264                 resp->rqstp->rq_vec[v].iov_base =
2265                         page_address(resp->rqstp->rq_respages[pn]);
2266                 resp->rqstp->rq_vec[v].iov_len =
2267                         len < PAGE_SIZE ? len : PAGE_SIZE;
2268                 v++;
2269                 len -= PAGE_SIZE;
2270         }
2271         read->rd_vlen = v;
2272
2273         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2274                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2275                         &maxcount);
2276
2277         if (nfserr == nfserr_symlink)
2278                 nfserr = nfserr_inval;
2279         if (nfserr)
2280                 return nfserr;
2281         eof = (read->rd_offset + maxcount >=
2282                read->rd_fhp->fh_dentry->d_inode->i_size);
2283
2284         WRITE32(eof);
2285         WRITE32(maxcount);
2286         ADJUST_ARGS();
2287         resp->xbuf->head[0].iov_len = (char*)p
2288                                         - (char*)resp->xbuf->head[0].iov_base;
2289         resp->xbuf->page_len = maxcount;
2290
2291         /* Use rest of head for padding and remaining ops: */
2292         resp->xbuf->tail[0].iov_base = p;
2293         resp->xbuf->tail[0].iov_len = 0;
2294         if (maxcount&3) {
2295                 RESERVE_SPACE(4);
2296                 WRITE32(0);
2297                 resp->xbuf->tail[0].iov_base += maxcount&3;
2298                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2299                 ADJUST_ARGS();
2300         }
2301         return 0;
2302 }
2303
2304 static __be32
2305 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2306 {
2307         int maxcount;
2308         char *page;
2309         ENCODE_HEAD;
2310
2311         if (nfserr)
2312                 return nfserr;
2313         if (resp->xbuf->page_len)
2314                 return nfserr_resource;
2315
2316         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2317
2318         maxcount = PAGE_SIZE;
2319         RESERVE_SPACE(4);
2320
2321         /*
2322          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2323          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2324          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2325          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2326          */
2327         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2328         if (nfserr == nfserr_isdir)
2329                 return nfserr_inval;
2330         if (nfserr)
2331                 return nfserr;
2332
2333         WRITE32(maxcount);
2334         ADJUST_ARGS();
2335         resp->xbuf->head[0].iov_len = (char*)p
2336                                 - (char*)resp->xbuf->head[0].iov_base;
2337         resp->xbuf->page_len = maxcount;
2338
2339         /* Use rest of head for padding and remaining ops: */
2340         resp->xbuf->tail[0].iov_base = p;
2341         resp->xbuf->tail[0].iov_len = 0;
2342         if (maxcount&3) {
2343                 RESERVE_SPACE(4);
2344                 WRITE32(0);
2345                 resp->xbuf->tail[0].iov_base += maxcount&3;
2346                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2347                 ADJUST_ARGS();
2348         }
2349         return 0;
2350 }
2351
2352 static __be32
2353 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2354 {
2355         int maxcount;
2356         loff_t offset;
2357         __be32 *page, *savep, *tailbase;
2358         ENCODE_HEAD;
2359
2360         if (nfserr)
2361                 return nfserr;
2362         if (resp->xbuf->page_len)
2363                 return nfserr_resource;
2364
2365         RESERVE_SPACE(8);  /* verifier */
2366         savep = p;
2367
2368         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2369         WRITE32(0);
2370         WRITE32(0);
2371         ADJUST_ARGS();
2372         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2373         tailbase = p;
2374
2375         maxcount = PAGE_SIZE;
2376         if (maxcount > readdir->rd_maxcount)
2377                 maxcount = readdir->rd_maxcount;
2378
2379         /*
2380          * Convert from bytes to words, account for the two words already
2381          * written, make sure to leave two words at the end for the next
2382          * pointer and eof field.
2383          */
2384         maxcount = (maxcount >> 2) - 4;
2385         if (maxcount < 0) {
2386                 nfserr =  nfserr_toosmall;
2387                 goto err_no_verf;
2388         }
2389
2390         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2391         readdir->common.err = 0;
2392         readdir->buflen = maxcount;
2393         readdir->buffer = page;
2394         readdir->offset = NULL;
2395
2396         offset = readdir->rd_cookie;
2397         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2398                               &offset,
2399                               &readdir->common, nfsd4_encode_dirent);
2400         if (nfserr == nfs_ok &&
2401             readdir->common.err == nfserr_toosmall &&
2402             readdir->buffer == page)
2403                 nfserr = nfserr_toosmall;
2404         if (nfserr == nfserr_symlink)
2405                 nfserr = nfserr_notdir;
2406         if (nfserr)
2407                 goto err_no_verf;
2408
2409         if (readdir->offset)
2410                 xdr_encode_hyper(readdir->offset, offset);
2411
2412         p = readdir->buffer;
2413         *p++ = 0;       /* no more entries */
2414         *p++ = htonl(readdir->common.err == nfserr_eof);
2415         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2416                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2417
2418         /* Use rest of head for padding and remaining ops: */
2419         resp->xbuf->tail[0].iov_base = tailbase;
2420         resp->xbuf->tail[0].iov_len = 0;
2421         resp->p = resp->xbuf->tail[0].iov_base;
2422         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2423
2424         return 0;
2425 err_no_verf:
2426         p = savep;
2427         ADJUST_ARGS();
2428         return nfserr;
2429 }
2430
2431 static void
2432 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2433 {
2434         ENCODE_HEAD;
2435
2436         if (!nfserr) {
2437                 RESERVE_SPACE(20);
2438                 WRITECINFO(remove->rm_cinfo);
2439                 ADJUST_ARGS();
2440         }
2441 }
2442
2443 static void
2444 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2445 {
2446         ENCODE_HEAD;
2447
2448         if (!nfserr) {
2449                 RESERVE_SPACE(40);
2450                 WRITECINFO(rename->rn_sinfo);
2451                 WRITECINFO(rename->rn_tinfo);
2452                 ADJUST_ARGS();
2453         }
2454 }
2455
2456 static void
2457 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2458                      struct nfsd4_secinfo *secinfo)
2459 {
2460         int i = 0;
2461         struct svc_export *exp = secinfo->si_exp;
2462         u32 nflavs;
2463         struct exp_flavor_info *flavs;
2464         struct exp_flavor_info def_flavs[2];
2465         ENCODE_HEAD;
2466
2467         if (nfserr)
2468                 goto out;
2469         if (exp->ex_nflavors) {
2470                 flavs = exp->ex_flavors;
2471                 nflavs = exp->ex_nflavors;
2472         } else { /* Handling of some defaults in absence of real secinfo: */
2473                 flavs = def_flavs;
2474                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2475                         nflavs = 2;
2476                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2477                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2478                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2479                         nflavs = 1;
2480                         flavs[0].pseudoflavor
2481                                         = svcauth_gss_flavor(exp->ex_client);
2482                 } else {
2483                         nflavs = 1;
2484                         flavs[0].pseudoflavor
2485                                         = exp->ex_client->flavour->flavour;
2486                 }
2487         }
2488
2489         RESERVE_SPACE(4);
2490         WRITE32(nflavs);
2491         ADJUST_ARGS();
2492         for (i = 0; i < nflavs; i++) {
2493                 u32 flav = flavs[i].pseudoflavor;
2494                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2495
2496                 if (gm) {
2497                         RESERVE_SPACE(4);
2498                         WRITE32(RPC_AUTH_GSS);
2499                         ADJUST_ARGS();
2500                         RESERVE_SPACE(4 + gm->gm_oid.len);
2501                         WRITE32(gm->gm_oid.len);
2502                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2503                         ADJUST_ARGS();
2504                         RESERVE_SPACE(4);
2505                         WRITE32(0); /* qop */
2506                         ADJUST_ARGS();
2507                         RESERVE_SPACE(4);
2508                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2509                         ADJUST_ARGS();
2510                         gss_mech_put(gm);
2511                 } else {
2512                         RESERVE_SPACE(4);
2513                         WRITE32(flav);
2514                         ADJUST_ARGS();
2515                 }
2516         }
2517 out:
2518         if (exp)
2519                 exp_put(exp);
2520 }
2521
2522 /*
2523  * The SETATTR encode routine is special -- it always encodes a bitmap,
2524  * regardless of the error status.
2525  */
2526 static void
2527 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2528 {
2529         ENCODE_HEAD;
2530
2531         RESERVE_SPACE(12);
2532         if (nfserr) {
2533                 WRITE32(2);
2534                 WRITE32(0);
2535                 WRITE32(0);
2536         }
2537         else {
2538                 WRITE32(2);
2539                 WRITE32(setattr->sa_bmval[0]);
2540                 WRITE32(setattr->sa_bmval[1]);
2541         }
2542         ADJUST_ARGS();
2543 }
2544
2545 static void
2546 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2547 {
2548         ENCODE_HEAD;
2549
2550         if (!nfserr) {
2551                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2552                 WRITEMEM(&scd->se_clientid, 8);
2553                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2554                 ADJUST_ARGS();
2555         }
2556         else if (nfserr == nfserr_clid_inuse) {
2557                 RESERVE_SPACE(8);
2558                 WRITE32(0);
2559                 WRITE32(0);
2560                 ADJUST_ARGS();
2561         }
2562 }
2563
2564 static void
2565 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2566 {
2567         ENCODE_HEAD;
2568
2569         if (!nfserr) {
2570                 RESERVE_SPACE(16);
2571                 WRITE32(write->wr_bytes_written);
2572                 WRITE32(write->wr_how_written);
2573                 WRITEMEM(write->wr_verifier.data, 8);
2574                 ADJUST_ARGS();
2575         }
2576 }
2577
2578 void
2579 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2580 {
2581         __be32 *statp;
2582         ENCODE_HEAD;
2583
2584         RESERVE_SPACE(8);
2585         WRITE32(op->opnum);
2586         statp = p++;    /* to be backfilled at the end */
2587         ADJUST_ARGS();
2588
2589         switch (op->opnum) {
2590         case OP_ACCESS:
2591                 nfsd4_encode_access(resp, op->status, &op->u.access);
2592                 break;
2593         case OP_CLOSE:
2594                 nfsd4_encode_close(resp, op->status, &op->u.close);
2595                 break;
2596         case OP_COMMIT:
2597                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2598                 break;
2599         case OP_CREATE:
2600                 nfsd4_encode_create(resp, op->status, &op->u.create);
2601                 break;
2602         case OP_DELEGRETURN:
2603                 break;
2604         case OP_GETATTR:
2605                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2606                 break;
2607         case OP_GETFH:
2608                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2609                 break;
2610         case OP_LINK:
2611                 nfsd4_encode_link(resp, op->status, &op->u.link);
2612                 break;
2613         case OP_LOCK:
2614                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2615                 break;
2616         case OP_LOCKT:
2617                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2618                 break;
2619         case OP_LOCKU:
2620                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2621                 break;
2622         case OP_LOOKUP:
2623                 break;
2624         case OP_LOOKUPP:
2625                 break;
2626         case OP_NVERIFY:
2627                 break;
2628         case OP_OPEN:
2629                 nfsd4_encode_open(resp, op->status, &op->u.open);
2630                 break;
2631         case OP_OPEN_CONFIRM:
2632                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2633                 break;
2634         case OP_OPEN_DOWNGRADE:
2635                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2636                 break;
2637         case OP_PUTFH:
2638                 break;
2639         case OP_PUTROOTFH:
2640                 break;
2641         case OP_READ:
2642                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2643                 break;
2644         case OP_READDIR:
2645                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2646                 break;
2647         case OP_READLINK:
2648                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2649                 break;
2650         case OP_REMOVE:
2651                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2652                 break;
2653         case OP_RENAME:
2654                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2655                 break;
2656         case OP_RENEW:
2657                 break;
2658         case OP_RESTOREFH:
2659                 break;
2660         case OP_SAVEFH:
2661                 break;
2662         case OP_SECINFO:
2663                 nfsd4_encode_secinfo(resp, op->status, &op->u.secinfo);
2664                 break;
2665         case OP_SETATTR:
2666                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2667                 break;
2668         case OP_SETCLIENTID:
2669                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2670                 break;
2671         case OP_SETCLIENTID_CONFIRM:
2672                 break;
2673         case OP_VERIFY:
2674                 break;
2675         case OP_WRITE:
2676                 nfsd4_encode_write(resp, op->status, &op->u.write);
2677                 break;
2678         case OP_RELEASE_LOCKOWNER:
2679                 break;
2680         default:
2681                 break;
2682         }
2683
2684         /*
2685          * Note: We write the status directly, instead of using WRITE32(),
2686          * since it is already in network byte order.
2687          */
2688         *statp = op->status;
2689 }
2690
2691 /*
2692  * Encode the reply stored in the stateowner reply cache
2693  *
2694  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2695  * previously sent already encoded operation.
2696  *
2697  * called with nfs4_lock_state() held
2698  */
2699 void
2700 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2701 {
2702         ENCODE_HEAD;
2703         struct nfs4_replay *rp = op->replay;
2704
2705         BUG_ON(!rp);
2706
2707         RESERVE_SPACE(8);
2708         WRITE32(op->opnum);
2709         *p++ = rp->rp_status;  /* already xdr'ed */
2710         ADJUST_ARGS();
2711
2712         RESERVE_SPACE(rp->rp_buflen);
2713         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2714         ADJUST_ARGS();
2715 }
2716
2717 /*
2718  * END OF "GENERIC" ENCODE ROUTINES.
2719  */
2720
2721 int
2722 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2723 {
2724         return xdr_ressize_check(rqstp, p);
2725 }
2726
2727 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2728 {
2729         if (args->ops != args->iops) {
2730                 kfree(args->ops);
2731                 args->ops = args->iops;
2732         }
2733         kfree(args->tmpp);
2734         args->tmpp = NULL;
2735         while (args->to_free) {
2736                 struct tmpbuf *tb = args->to_free;
2737                 args->to_free = tb->next;
2738                 tb->release(tb->buf);
2739                 kfree(tb);
2740         }
2741 }
2742
2743 int
2744 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2745 {
2746         __be32 status;
2747
2748         args->p = p;
2749         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2750         args->pagelist = rqstp->rq_arg.pages;
2751         args->pagelen = rqstp->rq_arg.page_len;
2752         args->tmpp = NULL;
2753         args->to_free = NULL;
2754         args->ops = args->iops;
2755         args->rqstp = rqstp;
2756
2757         status = nfsd4_decode_compound(args);
2758         if (status) {
2759                 nfsd4_release_compoundargs(args);
2760         }
2761         return !status;
2762 }
2763
2764 int
2765 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2766 {
2767         /*
2768          * All that remains is to write the tag and operation count...
2769          */
2770         struct kvec *iov;
2771         p = resp->tagp;
2772         *p++ = htonl(resp->taglen);
2773         memcpy(p, resp->tag, resp->taglen);
2774         p += XDR_QUADLEN(resp->taglen);
2775         *p++ = htonl(resp->opcnt);
2776
2777         if (rqstp->rq_res.page_len)
2778                 iov = &rqstp->rq_res.tail[0];
2779         else
2780                 iov = &rqstp->rq_res.head[0];
2781         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2782         BUG_ON(iov->iov_len > PAGE_SIZE);
2783         return 1;
2784 }
2785
2786 /*
2787  * Local variables:
2788  *  c-basic-offset: 8
2789  * End:
2790  */