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   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * TODO: Neil Brown made the following observation:  We currently
  36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37  * never release any of that until the request is complete.
  38  * It would be good to calculate a new maximum response size while
  39  * decoding the COMPOUND, and call svc_reserve with this number
  40  * at the end of nfs4svc_decode_compoundargs.
  41  */
  42
  43 #include <linux/param.h>
  44 #include <linux/smp.h>
  45 #include <linux/fs.h>
  46 #include <linux/namei.h>
  47 #include <linux/vfs.h>
  48 #include <linux/sunrpc/xdr.h>
  49 #include <linux/sunrpc/svc.h>
  50 #include <linux/sunrpc/clnt.h>
  51 #include <linux/nfsd/nfsd.h>
  52 #include <linux/nfsd/state.h>
  53 #include <linux/nfsd/xdr4.h>
  54 #include <linux/nfsd_idmap.h>
  55 #include <linux/nfs4.h>
  56 #include <linux/nfs4_acl.h>
  57 #include <linux/sunrpc/gss_api.h>
  58 #include <linux/sunrpc/svcauth_gss.h>
  59
  60 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  61
  62 /*
  63  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  64  * directory in order to indicate to the client that a filesystem boundary is present
  65  * We use a fixed fsid for a referral
  66  */
  67 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  68 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  69
  70 static __be32
  71 check_filename(char *str, int len, __be32 err)
  72 {
  73         int i;
  74
  75         if (len == 0)
  76                 return nfserr_inval;
  77         if (isdotent(str, len))
  78                 return err;
  79         for (i = 0; i < len; i++)
  80                 if (str[i] == '/')
  81                         return err;
  82         return 0;
  83 }
  84
  85 /*
  86  * START OF "GENERIC" DECODE ROUTINES.
  87  *   These may look a little ugly since they are imported from a "generic"
  88  * set of XDR encode/decode routines which are intended to be shared by
  89  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  90  *
  91  * If the pain of reading these is too great, it should be a straightforward
  92  * task to translate them into Linux-specific versions which are more
  93  * consistent with the style used in NFSv2/v3...
  94  */
  95 #define DECODE_HEAD                             \
  96         __be32 *p;                              \
  97         __be32 status
  98 #define DECODE_TAIL                             \
  99         status = 0;                             \
 100 out:                                            \
 101         return status;                          \
 102 xdr_error:                                      \
 103         dprintk("NFSD: xdr error (%s:%d)\n",    \
 104                         __FILE__, __LINE__);    \
 105         status = nfserr_bad_xdr;                \
 106         goto out
 107
 108 #define READ32(x)         (x) = ntohl(*p++)
 109 #define READ64(x)         do {                  \
 110         (x) = (u64)ntohl(*p++) << 32;           \
 111         (x) |= ntohl(*p++);                     \
 112 } while (0)
 113 #define READTIME(x)       do {                  \
 114         p++;                                    \
 115         (x) = ntohl(*p++);                      \
 116         p++;                                    \
 117 } while (0)
 118 #define READMEM(x,nbytes) do {                  \
 119         x = (char *)p;                          \
 120         p += XDR_QUADLEN(nbytes);               \
 121 } while (0)
 122 #define SAVEMEM(x,nbytes) do {                  \
 123         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 124                 savemem(argp, p, nbytes) :      \
 125                 (char *)p)) {                   \
 126                 dprintk("NFSD: xdr error (%s:%d)\n", \
 127                                 __FILE__, __LINE__); \
 128                 goto xdr_error;                 \
 129                 }                               \
 130         p += XDR_QUADLEN(nbytes);               \
 131 } while (0)
 132 #define COPYMEM(x,nbytes) do {                  \
 133         memcpy((x), p, nbytes);                 \
 134         p += XDR_QUADLEN(nbytes);               \
 135 } while (0)
 136
 137 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 138 #define READ_BUF(nbytes)  do {                  \
 139         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 140                 p = argp->p;                    \
 141                 argp->p += XDR_QUADLEN(nbytes); \
 142         } else if (!(p = read_buf(argp, nbytes))) { \
 143                 dprintk("NFSD: xdr error (%s:%d)\n", \
 144                                 __FILE__, __LINE__); \
 145                 goto xdr_error;                 \
 146         }                                       \
 147 } while (0)
 148
 149 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 150 {
 151         /* We want more bytes than seem to be available.
 152          * Maybe we need a new page, maybe we have just run out
 153          */
 154         unsigned int avail = (char *)argp->end - (char *)argp->p;
 155         __be32 *p;
 156         if (avail + argp->pagelen < nbytes)
 157                 return NULL;
 158         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 159                 return NULL;
 160         /* ok, we can do it with the current plus the next page */
 161         if (nbytes <= sizeof(argp->tmp))
 162                 p = argp->tmp;
 163         else {
 164                 kfree(argp->tmpp);
 165                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 166                 if (!p)
 167                         return NULL;
 168
 169         }
 170         /*
 171          * The following memcpy is safe because read_buf is always
 172          * called with nbytes > avail, and the two cases above both
 173          * guarantee p points to at least nbytes bytes.
 174          */
 175         memcpy(p, argp->p, avail);
 176         /* step to next page */
 177         argp->p = page_address(argp->pagelist[0]);
 178         argp->pagelist++;
 179         if (argp->pagelen < PAGE_SIZE) {
 180                 argp->end = p + (argp->pagelen>>2);
 181                 argp->pagelen = 0;
 182         } else {
 183                 argp->end = p + (PAGE_SIZE>>2);
 184                 argp->pagelen -= PAGE_SIZE;
 185         }
 186         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 187         argp->p += XDR_QUADLEN(nbytes - avail);
 188         return p;
 189 }
 190
 191 static int
 192 defer_free(struct nfsd4_compoundargs *argp,
 193                 void (*release)(const void *), void *p)
 194 {
 195         struct tmpbuf *tb;
 196
 197         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 198         if (!tb)
 199                 return -ENOMEM;
 200         tb->buf = p;
 201         tb->release = release;
 202         tb->next = argp->to_free;
 203         argp->to_free = tb;
 204         return 0;
 205 }
 206
 207 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 208 {
 209         if (p == argp->tmp) {
 210                 p = kmalloc(nbytes, GFP_KERNEL);
 211                 if (!p)
 212                         return NULL;
 213                 memcpy(p, argp->tmp, nbytes);
 214         } else {
 215                 BUG_ON(p != argp->tmpp);
 216                 argp->tmpp = NULL;
 217         }
 218         if (defer_free(argp, kfree, p)) {
 219                 kfree(p);
 220                 return NULL;
 221         } else
 222                 return (char *)p;
 223 }
 224
 225 static __be32
 226 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 227 {
 228         u32 bmlen;
 229         DECODE_HEAD;
 230
 231         bmval[0] = 0;
 232         bmval[1] = 0;
 233
 234         READ_BUF(4);
 235         READ32(bmlen);
 236         if (bmlen > 1000)
 237                 goto xdr_error;
 238
 239         READ_BUF(bmlen << 2);
 240         if (bmlen > 0)
 241                 READ32(bmval[0]);
 242         if (bmlen > 1)
 243                 READ32(bmval[1]);
 244
 245         DECODE_TAIL;
 246 }
 247
 248 static __be32
 249 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 250     struct nfs4_acl **acl)
 251 {
 252         int expected_len, len = 0;
 253         u32 dummy32;
 254         char *buf;
 255         int host_err;
 256
 257         DECODE_HEAD;
 258         iattr->ia_valid = 0;
 259         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 260                 return status;
 261
 262         /*
 263          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
 264          * read-only attributes return ERR_INVAL.
 265          */
 266         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 267                 return nfserr_attrnotsupp;
 268         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 269                 return nfserr_inval;
 270
 271         READ_BUF(4);
 272         READ32(expected_len);
 273
 274         if (bmval[0] & FATTR4_WORD0_SIZE) {
 275                 READ_BUF(8);
 276                 len += 8;
 277                 READ64(iattr->ia_size);
 278                 iattr->ia_valid |= ATTR_SIZE;
 279         }
 280         if (bmval[0] & FATTR4_WORD0_ACL) {
 281                 int nace;
 282                 struct nfs4_ace *ace;
 283
 284                 READ_BUF(4); len += 4;
 285                 READ32(nace);
 286
 287                 if (nace > NFS4_ACL_MAX)
 288                         return nfserr_resource;
 289
 290                 *acl = nfs4_acl_new(nace);
 291                 if (*acl == NULL) {
 292                         host_err = -ENOMEM;
 293                         goto out_nfserr;
 294                 }
 295                 defer_free(argp, kfree, *acl);
 296
 297                 (*acl)->naces = nace;
 298                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 299                         READ_BUF(16); len += 16;
 300                         READ32(ace->type);
 301                         READ32(ace->flag);
 302                         READ32(ace->access_mask);
 303                         READ32(dummy32);
 304                         READ_BUF(dummy32);
 305                         len += XDR_QUADLEN(dummy32) << 2;
 306                         READMEM(buf, dummy32);
 307                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 308                         host_err = 0;
 309                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 310                                 ace->who = 0;
 311                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 312                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 313                                                 buf, dummy32, &ace->who);
 314                         else
 315                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 316                                                 buf, dummy32, &ace->who);
 317                         if (host_err)
 318                                 goto out_nfserr;
 319                 }
 320         } else
 321                 *acl = NULL;
 322         if (bmval[1] & FATTR4_WORD1_MODE) {
 323                 READ_BUF(4);
 324                 len += 4;
 325                 READ32(iattr->ia_mode);
 326                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 327                 iattr->ia_valid |= ATTR_MODE;
 328         }
 329         if (bmval[1] & FATTR4_WORD1_OWNER) {
 330                 READ_BUF(4);
 331                 len += 4;
 332                 READ32(dummy32);
 333                 READ_BUF(dummy32);
 334                 len += (XDR_QUADLEN(dummy32) << 2);
 335                 READMEM(buf, dummy32);
 336                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 337                         goto out_nfserr;
 338                 iattr->ia_valid |= ATTR_UID;
 339         }
 340         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 341                 READ_BUF(4);
 342                 len += 4;
 343                 READ32(dummy32);
 344                 READ_BUF(dummy32);
 345                 len += (XDR_QUADLEN(dummy32) << 2);
 346                 READMEM(buf, dummy32);
 347                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 348                         goto out_nfserr;
 349                 iattr->ia_valid |= ATTR_GID;
 350         }
 351         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 352                 READ_BUF(4);
 353                 len += 4;
 354                 READ32(dummy32);
 355                 switch (dummy32) {
 356                 case NFS4_SET_TO_CLIENT_TIME:
 357                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 358                            all 32 bits of 'nseconds'. */
 359                         READ_BUF(12);
 360                         len += 12;
 361                         READ32(dummy32);
 362                         if (dummy32)
 363                                 return nfserr_inval;
 364                         READ32(iattr->ia_atime.tv_sec);
 365                         READ32(iattr->ia_atime.tv_nsec);
 366                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 367                                 return nfserr_inval;
 368                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 369                         break;
 370                 case NFS4_SET_TO_SERVER_TIME:
 371                         iattr->ia_valid |= ATTR_ATIME;
 372                         break;
 373                 default:
 374                         goto xdr_error;
 375                 }
 376         }
 377         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 378                 READ_BUF(4);
 379                 len += 4;
 380                 READ32(dummy32);
 381                 switch (dummy32) {
 382                 case NFS4_SET_TO_CLIENT_TIME:
 383                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 384                            all 32 bits of 'nseconds'. */
 385                         READ_BUF(12);
 386                         len += 12;
 387                         READ32(dummy32);
 388                         if (dummy32)
 389                                 return nfserr_inval;
 390                         READ32(iattr->ia_mtime.tv_sec);
 391                         READ32(iattr->ia_mtime.tv_nsec);
 392                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 393                                 return nfserr_inval;
 394                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 395                         break;
 396                 case NFS4_SET_TO_SERVER_TIME:
 397                         iattr->ia_valid |= ATTR_MTIME;
 398                         break;
 399                 default:
 400                         goto xdr_error;
 401                 }
 402         }
 403         if (len != expected_len)
 404                 goto xdr_error;
 405
 406         DECODE_TAIL;
 407
 408 out_nfserr:
 409         status = nfserrno(host_err);
 410         goto out;
 411 }
 412
 413 static __be32
 414 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 415 {
 416         DECODE_HEAD;
 417
 418         READ_BUF(sizeof(stateid_t));
 419         READ32(sid->si_generation);
 420         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 421
 422         DECODE_TAIL;
 423 }
 424
 425 static __be32
 426 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 427 {
 428         DECODE_HEAD;
 429
 430         READ_BUF(4);
 431         READ32(access->ac_req_access);
 432
 433         DECODE_TAIL;
 434 }
 435
 436 static __be32
 437 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 438 {
 439         DECODE_HEAD;
 440
 441         close->cl_stateowner = NULL;
 442         READ_BUF(4);
 443         READ32(close->cl_seqid);
 444         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 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         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 506 }
 507
 508 static inline __be32
 509 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 510 {
 511         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 512 }
 513
 514 static __be32
 515 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 516 {
 517         DECODE_HEAD;
 518
 519         READ_BUF(4);
 520         READ32(link->li_namelen);
 521         READ_BUF(link->li_namelen);
 522         SAVEMEM(link->li_name, link->li_namelen);
 523         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 524                 return status;
 525
 526         DECODE_TAIL;
 527 }
 528
 529 static __be32
 530 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 531 {
 532         DECODE_HEAD;
 533
 534         lock->lk_replay_owner = NULL;
 535         /*
 536         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 537         */
 538         READ_BUF(28);
 539         READ32(lock->lk_type);
 540         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 541                 goto xdr_error;
 542         READ32(lock->lk_reclaim);
 543         READ64(lock->lk_offset);
 544         READ64(lock->lk_length);
 545         READ32(lock->lk_is_new);
 546
 547         if (lock->lk_is_new) {
 548                 READ_BUF(4);
 549                 READ32(lock->lk_new_open_seqid);
 550                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 551                 if (status)
 552                         return status;
 553                 READ_BUF(8 + sizeof(clientid_t));
 554                 READ32(lock->lk_new_lock_seqid);
 555                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 556                 READ32(lock->lk_new_owner.len);
 557                 READ_BUF(lock->lk_new_owner.len);
 558                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 559         } else {
 560                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 561                 if (status)
 562                         return status;
 563                 READ_BUF(4);
 564                 READ32(lock->lk_old_lock_seqid);
 565         }
 566
 567         DECODE_TAIL;
 568 }
 569
 570 static __be32
 571 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 572 {
 573         DECODE_HEAD;
 574
 575         READ_BUF(32);
 576         READ32(lockt->lt_type);
 577         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 578                 goto xdr_error;
 579         READ64(lockt->lt_offset);
 580         READ64(lockt->lt_length);
 581         COPYMEM(&lockt->lt_clientid, 8);
 582         READ32(lockt->lt_owner.len);
 583         READ_BUF(lockt->lt_owner.len);
 584         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 585
 586         DECODE_TAIL;
 587 }
 588
 589 static __be32
 590 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 591 {
 592         DECODE_HEAD;
 593
 594         locku->lu_stateowner = NULL;
 595         READ_BUF(8);
 596         READ32(locku->lu_type);
 597         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 598                 goto xdr_error;
 599         READ32(locku->lu_seqid);
 600         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 601         if (status)
 602                 return status;
 603         READ_BUF(16);
 604         READ64(locku->lu_offset);
 605         READ64(locku->lu_length);
 606
 607         DECODE_TAIL;
 608 }
 609
 610 static __be32
 611 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 612 {
 613         DECODE_HEAD;
 614
 615         READ_BUF(4);
 616         READ32(lookup->lo_len);
 617         READ_BUF(lookup->lo_len);
 618         SAVEMEM(lookup->lo_name, lookup->lo_len);
 619         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 620                 return status;
 621
 622         DECODE_TAIL;
 623 }
 624
 625 static __be32
 626 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 627 {
 628         DECODE_HEAD;
 629
 630         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 631         open->op_iattr.ia_valid = 0;
 632         open->op_stateowner = NULL;
 633
 634         /* seqid, share_access, share_deny, clientid, ownerlen */
 635         READ_BUF(16 + sizeof(clientid_t));
 636         READ32(open->op_seqid);
 637         READ32(open->op_share_access);
 638         READ32(open->op_share_deny);
 639         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 640         READ32(open->op_owner.len);
 641
 642         /* owner, open_flag */
 643         READ_BUF(open->op_owner.len + 4);
 644         SAVEMEM(open->op_owner.data, open->op_owner.len);
 645         READ32(open->op_create);
 646         switch (open->op_create) {
 647         case NFS4_OPEN_NOCREATE:
 648                 break;
 649         case NFS4_OPEN_CREATE:
 650                 READ_BUF(4);
 651                 READ32(open->op_createmode);
 652                 switch (open->op_createmode) {
 653                 case NFS4_CREATE_UNCHECKED:
 654                 case NFS4_CREATE_GUARDED:
 655                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 656                                 goto out;
 657                         break;
 658                 case NFS4_CREATE_EXCLUSIVE:
 659                         READ_BUF(8);
 660                         COPYMEM(open->op_verf.data, 8);
 661                         break;
 662                 default:
 663                         goto xdr_error;
 664                 }
 665                 break;
 666         default:
 667                 goto xdr_error;
 668         }
 669
 670         /* open_claim */
 671         READ_BUF(4);
 672         READ32(open->op_claim_type);
 673         switch (open->op_claim_type) {
 674         case NFS4_OPEN_CLAIM_NULL:
 675         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 676                 READ_BUF(4);
 677                 READ32(open->op_fname.len);
 678                 READ_BUF(open->op_fname.len);
 679                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 680                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 681                         return status;
 682                 break;
 683         case NFS4_OPEN_CLAIM_PREVIOUS:
 684                 READ_BUF(4);
 685                 READ32(open->op_delegate_type);
 686                 break;
 687         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 688                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 689                 if (status)
 690                         return status;
 691                 READ_BUF(4);
 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         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 712         if (status)
 713                 return status;
 714         READ_BUF(4);
 715         READ32(open_conf->oc_seqid);
 716
 717         DECODE_TAIL;
 718 }
 719
 720 static __be32
 721 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 722 {
 723         DECODE_HEAD;
 724
 725         open_down->od_stateowner = NULL;
 726         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 727         if (status)
 728                 return status;
 729         READ_BUF(12);
 730         READ32(open_down->od_seqid);
 731         READ32(open_down->od_share_access);
 732         READ32(open_down->od_share_deny);
 733
 734         DECODE_TAIL;
 735 }
 736
 737 static __be32
 738 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 739 {
 740         DECODE_HEAD;
 741
 742         READ_BUF(4);
 743         READ32(putfh->pf_fhlen);
 744         if (putfh->pf_fhlen > NFS4_FHSIZE)
 745                 goto xdr_error;
 746         READ_BUF(putfh->pf_fhlen);
 747         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 748
 749         DECODE_TAIL;
 750 }
 751
 752 static __be32
 753 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 754 {
 755         DECODE_HEAD;
 756
 757         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 758         if (status)
 759                 return status;
 760         READ_BUF(12);
 761         READ64(read->rd_offset);
 762         READ32(read->rd_length);
 763
 764         DECODE_TAIL;
 765 }
 766
 767 static __be32
 768 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 769 {
 770         DECODE_HEAD;
 771
 772         READ_BUF(24);
 773         READ64(readdir->rd_cookie);
 774         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 775         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 776         READ32(readdir->rd_maxcount);
 777         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 778                 goto out;
 779
 780         DECODE_TAIL;
 781 }
 782
 783 static __be32
 784 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 785 {
 786         DECODE_HEAD;
 787
 788         READ_BUF(4);
 789         READ32(remove->rm_namelen);
 790         READ_BUF(remove->rm_namelen);
 791         SAVEMEM(remove->rm_name, remove->rm_namelen);
 792         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 793                 return status;
 794
 795         DECODE_TAIL;
 796 }
 797
 798 static __be32
 799 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 800 {
 801         DECODE_HEAD;
 802
 803         READ_BUF(4);
 804         READ32(rename->rn_snamelen);
 805         READ_BUF(rename->rn_snamelen + 4);
 806         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 807         READ32(rename->rn_tnamelen);
 808         READ_BUF(rename->rn_tnamelen);
 809         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 810         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 811                 return status;
 812         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 813                 return status;
 814
 815         DECODE_TAIL;
 816 }
 817
 818 static __be32
 819 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 820 {
 821         DECODE_HEAD;
 822
 823         READ_BUF(sizeof(clientid_t));
 824         COPYMEM(clientid, sizeof(clientid_t));
 825
 826         DECODE_TAIL;
 827 }
 828
 829 static __be32
 830 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 831                      struct nfsd4_secinfo *secinfo)
 832 {
 833         DECODE_HEAD;
 834
 835         READ_BUF(4);
 836         READ32(secinfo->si_namelen);
 837         READ_BUF(secinfo->si_namelen);
 838         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 839         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 840                                                                 nfserr_noent);
 841         if (status)
 842                 return status;
 843         DECODE_TAIL;
 844 }
 845
 846 static __be32
 847 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 848 {
 849         __be32 status;
 850
 851         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 852         if (status)
 853                 return status;
 854         return nfsd4_decode_fattr(argp, setattr->sa_bmval,
 855                                   &setattr->sa_iattr, &setattr->sa_acl);
 856 }
 857
 858 static __be32
 859 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 860 {
 861         DECODE_HEAD;
 862
 863         READ_BUF(12);
 864         COPYMEM(setclientid->se_verf.data, 8);
 865         READ32(setclientid->se_namelen);
 866
 867         READ_BUF(setclientid->se_namelen + 8);
 868         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 869         READ32(setclientid->se_callback_prog);
 870         READ32(setclientid->se_callback_netid_len);
 871
 872         READ_BUF(setclientid->se_callback_netid_len + 4);
 873         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 874         READ32(setclientid->se_callback_addr_len);
 875
 876         READ_BUF(setclientid->se_callback_addr_len + 4);
 877         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 878         READ32(setclientid->se_callback_ident);
 879
 880         DECODE_TAIL;
 881 }
 882
 883 static __be32
 884 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 885 {
 886         DECODE_HEAD;
 887
 888         READ_BUF(8 + sizeof(nfs4_verifier));
 889         COPYMEM(&scd_c->sc_clientid, 8);
 890         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 891
 892         DECODE_TAIL;
 893 }
 894
 895 /* Also used for NVERIFY */
 896 static __be32
 897 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 898 {
 899 #if 0
 900         struct nfsd4_compoundargs save = {
 901                 .p = argp->p,
 902                 .end = argp->end,
 903                 .rqstp = argp->rqstp,
 904         };
 905         u32             ve_bmval[2];
 906         struct iattr    ve_iattr;           /* request */
 907         struct nfs4_acl *ve_acl;            /* request */
 908 #endif
 909         DECODE_HEAD;
 910
 911         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 912                 goto out;
 913
 914         /* For convenience's sake, we compare raw xdr'd attributes in
 915          * nfsd4_proc_verify; however we still decode here just to return
 916          * correct error in case of bad xdr. */
 917 #if 0
 918         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 919         if (status == nfserr_inval) {
 920                 status = nfserrno(status);
 921                 goto out;
 922         }
 923 #endif
 924         READ_BUF(4);
 925         READ32(verify->ve_attrlen);
 926         READ_BUF(verify->ve_attrlen);
 927         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 928
 929         DECODE_TAIL;
 930 }
 931
 932 static __be32
 933 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 934 {
 935         int avail;
 936         int v;
 937         int len;
 938         DECODE_HEAD;
 939
 940         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
 941         if (status)
 942                 return status;
 943         READ_BUF(16);
 944         READ64(write->wr_offset);
 945         READ32(write->wr_stable_how);
 946         if (write->wr_stable_how > 2)
 947                 goto xdr_error;
 948         READ32(write->wr_buflen);
 949
 950         /* Sorry .. no magic macros for this.. *
 951          * READ_BUF(write->wr_buflen);
 952          * SAVEMEM(write->wr_buf, write->wr_buflen);
 953          */
 954         avail = (char*)argp->end - (char*)argp->p;
 955         if (avail + argp->pagelen < write->wr_buflen) {
 956                 dprintk("NFSD: xdr error (%s:%d)\n",
 957                                 __FILE__, __LINE__);
 958                 goto xdr_error;
 959         }
 960         argp->rqstp->rq_vec[0].iov_base = p;
 961         argp->rqstp->rq_vec[0].iov_len = avail;
 962         v = 0;
 963         len = write->wr_buflen;
 964         while (len > argp->rqstp->rq_vec[v].iov_len) {
 965                 len -= argp->rqstp->rq_vec[v].iov_len;
 966                 v++;
 967                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 968                 argp->pagelist++;
 969                 if (argp->pagelen >= PAGE_SIZE) {
 970                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 971                         argp->pagelen -= PAGE_SIZE;
 972                 } else {
 973                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 974                         argp->pagelen -= len;
 975                 }
 976         }
 977         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 978         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 979         argp->rqstp->rq_vec[v].iov_len = len;
 980         write->wr_vlen = v+1;
 981
 982         DECODE_TAIL;
 983 }
 984
 985 static __be32
 986 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 987 {
 988         DECODE_HEAD;
 989
 990         READ_BUF(12);
 991         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 992         READ32(rlockowner->rl_owner.len);
 993         READ_BUF(rlockowner->rl_owner.len);
 994         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 995
 996         DECODE_TAIL;
 997 }
 998
 999 static __be32
1000 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1001                          struct nfsd4_exchange_id *clid)
1002 {
1003         return nfserr_opnotsupp;        /* stub */
1004 }
1005
1006 static __be32
1007 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1008                             struct nfsd4_create_session *sess)
1009 {
1010         return nfserr_opnotsupp;        /* stub */
1011 }
1012
1013 static __be32
1014 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1015                              struct nfsd4_destroy_session *destroy_session)
1016 {
1017         return nfserr_opnotsupp;        /* stub */
1018 }
1019
1020 static __be32
1021 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1022                       struct nfsd4_sequence *seq)
1023 {
1024         return nfserr_opnotsupp;        /* stub */
1025 }
1026
1027 static __be32
1028 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1029 {
1030         return nfs_ok;
1031 }
1032
1033 static __be32
1034 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1035 {
1036         return nfserr_notsupp;
1037 }
1038
1039 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1040
1041 static nfsd4_dec nfsd4_dec_ops[] = {
1042         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1043         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1044         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1045         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1046         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1047         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1048         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1049         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1050         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1051         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1052         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1053         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1054         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1055         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1056         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1057         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1058         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1059         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1060         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1061         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1062         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1063         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1064         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1065         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1066         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1067         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1068         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1069         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1070         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1071         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1072         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1073         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1074         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1075         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1076         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1077         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1078         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1079 };
1080
1081 static nfsd4_dec nfsd41_dec_ops[] = {
1082         [OP_ACCESS]             (nfsd4_dec)nfsd4_decode_access,
1083         [OP_CLOSE]              (nfsd4_dec)nfsd4_decode_close,
1084         [OP_COMMIT]             (nfsd4_dec)nfsd4_decode_commit,
1085         [OP_CREATE]             (nfsd4_dec)nfsd4_decode_create,
1086         [OP_DELEGPURGE]         (nfsd4_dec)nfsd4_decode_notsupp,
1087         [OP_DELEGRETURN]        (nfsd4_dec)nfsd4_decode_delegreturn,
1088         [OP_GETATTR]            (nfsd4_dec)nfsd4_decode_getattr,
1089         [OP_GETFH]              (nfsd4_dec)nfsd4_decode_noop,
1090         [OP_LINK]               (nfsd4_dec)nfsd4_decode_link,
1091         [OP_LOCK]               (nfsd4_dec)nfsd4_decode_lock,
1092         [OP_LOCKT]              (nfsd4_dec)nfsd4_decode_lockt,
1093         [OP_LOCKU]              (nfsd4_dec)nfsd4_decode_locku,
1094         [OP_LOOKUP]             (nfsd4_dec)nfsd4_decode_lookup,
1095         [OP_LOOKUPP]            (nfsd4_dec)nfsd4_decode_noop,
1096         [OP_NVERIFY]            (nfsd4_dec)nfsd4_decode_verify,
1097         [OP_OPEN]               (nfsd4_dec)nfsd4_decode_open,
1098         [OP_OPENATTR]           (nfsd4_dec)nfsd4_decode_notsupp,
1099         [OP_OPEN_CONFIRM]       (nfsd4_dec)nfsd4_decode_notsupp,
1100         [OP_OPEN_DOWNGRADE]     (nfsd4_dec)nfsd4_decode_open_downgrade,
1101         [OP_PUTFH]              (nfsd4_dec)nfsd4_decode_putfh,
1102         [OP_PUTPUBFH]           (nfsd4_dec)nfsd4_decode_notsupp,
1103         [OP_PUTROOTFH]          (nfsd4_dec)nfsd4_decode_noop,
1104         [OP_READ]               (nfsd4_dec)nfsd4_decode_read,
1105         [OP_READDIR]            (nfsd4_dec)nfsd4_decode_readdir,
1106         [OP_READLINK]           (nfsd4_dec)nfsd4_decode_noop,
1107         [OP_REMOVE]             (nfsd4_dec)nfsd4_decode_remove,
1108         [OP_RENAME]             (nfsd4_dec)nfsd4_decode_rename,
1109         [OP_RENEW]              (nfsd4_dec)nfsd4_decode_notsupp,
1110         [OP_RESTOREFH]          (nfsd4_dec)nfsd4_decode_noop,
1111         [OP_SAVEFH]             (nfsd4_dec)nfsd4_decode_noop,
1112         [OP_SECINFO]            (nfsd4_dec)nfsd4_decode_secinfo,
1113         [OP_SETATTR]            (nfsd4_dec)nfsd4_decode_setattr,
1114         [OP_SETCLIENTID]        (nfsd4_dec)nfsd4_decode_notsupp,
1115         [OP_SETCLIENTID_CONFIRM](nfsd4_dec)nfsd4_decode_notsupp,
1116         [OP_VERIFY]             (nfsd4_dec)nfsd4_decode_verify,
1117         [OP_WRITE]              (nfsd4_dec)nfsd4_decode_write,
1118         [OP_RELEASE_LOCKOWNER]  (nfsd4_dec)nfsd4_decode_notsupp,
1119
1120         /* new operations for NFSv4.1 */
1121         [OP_BACKCHANNEL_CTL]    (nfsd4_dec)nfsd4_decode_notsupp,
1122         [OP_BIND_CONN_TO_SESSION](nfsd4_dec)nfsd4_decode_notsupp,
1123         [OP_EXCHANGE_ID]        (nfsd4_dec)nfsd4_decode_exchange_id,
1124         [OP_CREATE_SESSION]     (nfsd4_dec)nfsd4_decode_create_session,
1125         [OP_DESTROY_SESSION]    (nfsd4_dec)nfsd4_decode_destroy_session,
1126         [OP_FREE_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1127         [OP_GET_DIR_DELEGATION] (nfsd4_dec)nfsd4_decode_notsupp,
1128         [OP_GETDEVICEINFO]      (nfsd4_dec)nfsd4_decode_notsupp,
1129         [OP_GETDEVICELIST]      (nfsd4_dec)nfsd4_decode_notsupp,
1130         [OP_LAYOUTCOMMIT]       (nfsd4_dec)nfsd4_decode_notsupp,
1131         [OP_LAYOUTGET]          (nfsd4_dec)nfsd4_decode_notsupp,
1132         [OP_LAYOUTRETURN]       (nfsd4_dec)nfsd4_decode_notsupp,
1133         [OP_SECINFO_NO_NAME]    (nfsd4_dec)nfsd4_decode_notsupp,
1134         [OP_SEQUENCE]           (nfsd4_dec)nfsd4_decode_sequence,
1135         [OP_SET_SSV]            (nfsd4_dec)nfsd4_decode_notsupp,
1136         [OP_TEST_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1137         [OP_WANT_DELEGATION]    (nfsd4_dec)nfsd4_decode_notsupp,
1138         [OP_DESTROY_CLIENTID]   (nfsd4_dec)nfsd4_decode_notsupp,
1139         [OP_RECLAIM_COMPLETE]   (nfsd4_dec)nfsd4_decode_notsupp,
1140 };
1141
1142 struct nfsd4_minorversion_ops {
1143         nfsd4_dec *decoders;
1144         int nops;
1145 };
1146
1147 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1148         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1149         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1150 };
1151
1152 static __be32
1153 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1154 {
1155         DECODE_HEAD;
1156         struct nfsd4_op *op;
1157         struct nfsd4_minorversion_ops *ops;
1158         int i;
1159
1160         /*
1161          * XXX: According to spec, we should check the tag
1162          * for UTF-8 compliance.  I'm postponing this for
1163          * now because it seems that some clients do use
1164          * binary tags.
1165          */
1166         READ_BUF(4);
1167         READ32(argp->taglen);
1168         READ_BUF(argp->taglen + 8);
1169         SAVEMEM(argp->tag, argp->taglen);
1170         READ32(argp->minorversion);
1171         READ32(argp->opcnt);
1172
1173         if (argp->taglen > NFSD4_MAX_TAGLEN)
1174                 goto xdr_error;
1175         if (argp->opcnt > 100)
1176                 goto xdr_error;
1177
1178         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1179                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1180                 if (!argp->ops) {
1181                         argp->ops = argp->iops;
1182                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1183                         goto xdr_error;
1184                 }
1185         }
1186
1187         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1188                 argp->opcnt = 0;
1189
1190         ops = &nfsd4_minorversion[argp->minorversion];
1191         for (i = 0; i < argp->opcnt; i++) {
1192                 op = &argp->ops[i];
1193                 op->replay = NULL;
1194
1195                 /*
1196                  * We can't use READ_BUF() here because we need to handle
1197                  * a missing opcode as an OP_WRITE + 1. So we need to check
1198                  * to see if we're truly at the end of our buffer or if there
1199                  * is another page we need to flip to.
1200                  */
1201
1202                 if (argp->p == argp->end) {
1203                         if (argp->pagelen < 4) {
1204                                 /* There isn't an opcode still on the wire */
1205                                 op->opnum = OP_WRITE + 1;
1206                                 op->status = nfserr_bad_xdr;
1207                                 argp->opcnt = i+1;
1208                                 break;
1209                         }
1210
1211                         /*
1212                          * False alarm. We just hit a page boundary, but there
1213                          * is still data available.  Move pointer across page
1214                          * boundary.  *snip from READ_BUF*
1215                          */
1216                         argp->p = page_address(argp->pagelist[0]);
1217                         argp->pagelist++;
1218                         if (argp->pagelen < PAGE_SIZE) {
1219                                 argp->end = p + (argp->pagelen>>2);
1220                                 argp->pagelen = 0;
1221                         } else {
1222                                 argp->end = p + (PAGE_SIZE>>2);
1223                                 argp->pagelen -= PAGE_SIZE;
1224                         }
1225                 }
1226                 op->opnum = ntohl(*argp->p++);
1227
1228                 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1229                         op->status = ops->decoders[op->opnum](argp, &op->u);
1230                 else {
1231                         op->opnum = OP_ILLEGAL;
1232                         op->status = nfserr_op_illegal;
1233                 }
1234
1235                 if (op->status) {
1236                         argp->opcnt = i+1;
1237                         break;
1238                 }
1239         }
1240
1241         DECODE_TAIL;
1242 }
1243 /*
1244  * END OF "GENERIC" DECODE ROUTINES.
1245  */
1246
1247 /*
1248  * START OF "GENERIC" ENCODE ROUTINES.
1249  *   These may look a little ugly since they are imported from a "generic"
1250  * set of XDR encode/decode routines which are intended to be shared by
1251  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1252  *
1253  * If the pain of reading these is too great, it should be a straightforward
1254  * task to translate them into Linux-specific versions which are more
1255  * consistent with the style used in NFSv2/v3...
1256  */
1257 #define ENCODE_HEAD              __be32 *p
1258
1259 #define WRITE32(n)               *p++ = htonl(n)
1260 #define WRITE64(n)               do {                           \
1261         *p++ = htonl((u32)((n) >> 32));                         \
1262         *p++ = htonl((u32)(n));                                 \
1263 } while (0)
1264 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1265         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1266         memcpy(p, ptr, nbytes);                                 \
1267         p += XDR_QUADLEN(nbytes);                               \
1268 }} while (0)
1269 #define WRITECINFO(c)           do {                            \
1270         *p++ = htonl(c.atomic);                                 \
1271         *p++ = htonl(c.before_ctime_sec);                               \
1272         *p++ = htonl(c.before_ctime_nsec);                              \
1273         *p++ = htonl(c.after_ctime_sec);                                \
1274         *p++ = htonl(c.after_ctime_nsec);                               \
1275 } while (0)
1276
1277 #define RESERVE_SPACE(nbytes)   do {                            \
1278         p = resp->p;                                            \
1279         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1280 } while (0)
1281 #define ADJUST_ARGS()           resp->p = p
1282
1283 /*
1284  * Header routine to setup seqid operation replay cache
1285  */
1286 #define ENCODE_SEQID_OP_HEAD                                    \
1287         __be32 *save;                                           \
1288                                                                 \
1289         save = resp->p;
1290
1291 /*
1292  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1293  * is where sequence id's are incremented, and the replay cache is filled.
1294  * Note that we increment sequence id's here, at the last moment, so we're sure
1295  * we know whether the error to be returned is a sequence id mutating error.
1296  */
1297
1298 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1299         if (seqid_mutating_err(nfserr) && stateowner) {         \
1300                 stateowner->so_seqid++;                         \
1301                 stateowner->so_replay.rp_status = nfserr;       \
1302                 stateowner->so_replay.rp_buflen =               \
1303                           (((char *)(resp)->p - (char *)save)); \
1304                 memcpy(stateowner->so_replay.rp_buf, save,      \
1305                         stateowner->so_replay.rp_buflen);       \
1306         } } while (0);
1307
1308 /* Encode as an array of strings the string given with components
1309  * seperated @sep.
1310  */
1311 static __be32 nfsd4_encode_components(char sep, char *components,
1312                                    __be32 **pp, int *buflen)
1313 {
1314         __be32 *p = *pp;
1315         __be32 *countp = p;
1316         int strlen, count=0;
1317         char *str, *end;
1318
1319         dprintk("nfsd4_encode_components(%s)\n", components);
1320         if ((*buflen -= 4) < 0)
1321                 return nfserr_resource;
1322         WRITE32(0); /* We will fill this in with @count later */
1323         end = str = components;
1324         while (*end) {
1325                 for (; *end && (*end != sep); end++)
1326                         ; /* Point to end of component */
1327                 strlen = end - str;
1328                 if (strlen) {
1329                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1330                                 return nfserr_resource;
1331                         WRITE32(strlen);
1332                         WRITEMEM(str, strlen);
1333                         count++;
1334                 }
1335                 else
1336                         end++;
1337                 str = end;
1338         }
1339         *pp = p;
1340         p = countp;
1341         WRITE32(count);
1342         return 0;
1343 }
1344
1345 /*
1346  * encode a location element of a fs_locations structure
1347  */
1348 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1349                                     __be32 **pp, int *buflen)
1350 {
1351         __be32 status;
1352         __be32 *p = *pp;
1353
1354         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1355         if (status)
1356                 return status;
1357         status = nfsd4_encode_components('/', location->path, &p, buflen);
1358         if (status)
1359                 return status;
1360         *pp = p;
1361         return 0;
1362 }
1363
1364 /*
1365  * Return the path to an export point in the pseudo filesystem namespace
1366  * Returned string is safe to use as long as the caller holds a reference
1367  * to @exp.
1368  */
1369 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1370 {
1371         struct svc_fh tmp_fh;
1372         char *path, *rootpath;
1373
1374         fh_init(&tmp_fh, NFS4_FHSIZE);
1375         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1376         if (*stat)
1377                 return NULL;
1378         rootpath = tmp_fh.fh_export->ex_pathname;
1379
1380         path = exp->ex_pathname;
1381
1382         if (strncmp(path, rootpath, strlen(rootpath))) {
1383                 dprintk("nfsd: fs_locations failed;"
1384                         "%s is not contained in %s\n", path, rootpath);
1385                 *stat = nfserr_notsupp;
1386                 return NULL;
1387         }
1388
1389         return path + strlen(rootpath);
1390 }
1391
1392 /*
1393  *  encode a fs_locations structure
1394  */
1395 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1396                                      struct svc_export *exp,
1397                                      __be32 **pp, int *buflen)
1398 {
1399         __be32 status;
1400         int i;
1401         __be32 *p = *pp;
1402         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1403         char *root = nfsd4_path(rqstp, exp, &status);
1404
1405         if (status)
1406                 return status;
1407         status = nfsd4_encode_components('/', root, &p, buflen);
1408         if (status)
1409                 return status;
1410         if ((*buflen -= 4) < 0)
1411                 return nfserr_resource;
1412         WRITE32(fslocs->locations_count);
1413         for (i=0; i<fslocs->locations_count; i++) {
1414                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1415                                                    &p, buflen);
1416                 if (status)
1417                         return status;
1418         }
1419         *pp = p;
1420         return 0;
1421 }
1422
1423 static u32 nfs4_ftypes[16] = {
1424         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1425         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1426         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1427         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1428 };
1429
1430 static __be32
1431 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1432                         __be32 **p, int *buflen)
1433 {
1434         int status;
1435
1436         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1437                 return nfserr_resource;
1438         if (whotype != NFS4_ACL_WHO_NAMED)
1439                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1440         else if (group)
1441                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1442         else
1443                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1444         if (status < 0)
1445                 return nfserrno(status);
1446         *p = xdr_encode_opaque(*p, NULL, status);
1447         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1448         BUG_ON(*buflen < 0);
1449         return 0;
1450 }
1451
1452 static inline __be32
1453 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1454 {
1455         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1456 }
1457
1458 static inline __be32
1459 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1460 {
1461         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1462 }
1463
1464 static inline __be32
1465 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1466                 __be32 **p, int *buflen)
1467 {
1468         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1469 }
1470
1471 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1472                               FATTR4_WORD0_RDATTR_ERROR)
1473 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1474
1475 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1476 {
1477         /* As per referral draft:  */
1478         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1479             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1480                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1481                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1482                         *rdattr_err = NFSERR_MOVED;
1483                 else
1484                         return nfserr_moved;
1485         }
1486         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1487         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1488         return 0;
1489 }
1490
1491 /*
1492  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1493  * ourselves.
1494  *
1495  * @countp is the buffer size in _words_; upon successful return this becomes
1496  * replaced with the number of words written.
1497  */
1498 __be32
1499 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1500                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1501                 struct svc_rqst *rqstp, int ignore_crossmnt)
1502 {
1503         u32 bmval0 = bmval[0];
1504         u32 bmval1 = bmval[1];
1505         struct kstat stat;
1506         struct svc_fh tempfh;
1507         struct kstatfs statfs;
1508         int buflen = *countp << 2;
1509         __be32 *attrlenp;
1510         u32 dummy;
1511         u64 dummy64;
1512         u32 rdattr_err = 0;
1513         __be32 *p = buffer;
1514         __be32 status;
1515         int err;
1516         int aclsupport = 0;
1517         struct nfs4_acl *acl = NULL;
1518
1519         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1520         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1521         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1522
1523         if (exp->ex_fslocs.migrated) {
1524                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1525                 if (status)
1526                         goto out;
1527         }
1528
1529         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1530         if (err)
1531                 goto out_nfserr;
1532         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1533                         FATTR4_WORD0_MAXNAME)) ||
1534             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1535                        FATTR4_WORD1_SPACE_TOTAL))) {
1536                 err = vfs_statfs(dentry, &statfs);
1537                 if (err)
1538                         goto out_nfserr;
1539         }
1540         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1541                 fh_init(&tempfh, NFS4_FHSIZE);
1542                 status = fh_compose(&tempfh, exp, dentry, NULL);
1543                 if (status)
1544                         goto out;
1545                 fhp = &tempfh;
1546         }
1547         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1548                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1549                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1550                 aclsupport = (err == 0);
1551                 if (bmval0 & FATTR4_WORD0_ACL) {
1552                         if (err == -EOPNOTSUPP)
1553                                 bmval0 &= ~FATTR4_WORD0_ACL;
1554                         else if (err == -EINVAL) {
1555                                 status = nfserr_attrnotsupp;
1556                                 goto out;
1557                         } else if (err != 0)
1558                                 goto out_nfserr;
1559                 }
1560         }
1561         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1562                 if (exp->ex_fslocs.locations == NULL) {
1563                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1564                 }
1565         }
1566         if ((buflen -= 16) < 0)
1567                 goto out_resource;
1568
1569         WRITE32(2);
1570         WRITE32(bmval0);
1571         WRITE32(bmval1);
1572         attrlenp = p++;                /* to be backfilled later */
1573
1574         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1575                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1576                 if ((buflen -= 12) < 0)
1577                         goto out_resource;
1578                 if (!aclsupport)
1579                         word0 &= ~FATTR4_WORD0_ACL;
1580                 if (!exp->ex_fslocs.locations)
1581                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1582                 WRITE32(2);
1583                 WRITE32(word0);
1584                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1585         }
1586         if (bmval0 & FATTR4_WORD0_TYPE) {
1587                 if ((buflen -= 4) < 0)
1588                         goto out_resource;
1589                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1590                 if (dummy == NF4BAD)
1591                         goto out_serverfault;
1592                 WRITE32(dummy);
1593         }
1594         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1595                 if ((buflen -= 4) < 0)
1596                         goto out_resource;
1597                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1598                         WRITE32(NFS4_FH_PERSISTENT);
1599                 else
1600                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1601         }
1602         if (bmval0 & FATTR4_WORD0_CHANGE) {
1603                 /*
1604                  * Note: This _must_ be consistent with the scheme for writing
1605                  * change_info, so any changes made here must be reflected there
1606                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1607                  * macro above.)
1608                  */
1609                 if ((buflen -= 8) < 0)
1610                         goto out_resource;
1611                 WRITE32(stat.ctime.tv_sec);
1612                 WRITE32(stat.ctime.tv_nsec);
1613         }
1614         if (bmval0 & FATTR4_WORD0_SIZE) {
1615                 if ((buflen -= 8) < 0)
1616                         goto out_resource;
1617                 WRITE64(stat.size);
1618         }
1619         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1620                 if ((buflen -= 4) < 0)
1621                         goto out_resource;
1622                 WRITE32(1);
1623         }
1624         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1625                 if ((buflen -= 4) < 0)
1626                         goto out_resource;
1627                 WRITE32(1);
1628         }
1629         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1630                 if ((buflen -= 4) < 0)
1631                         goto out_resource;
1632                 WRITE32(0);
1633         }
1634         if (bmval0 & FATTR4_WORD0_FSID) {
1635                 if ((buflen -= 16) < 0)
1636                         goto out_resource;
1637                 if (exp->ex_fslocs.migrated) {
1638                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1639                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1640                 } else switch(fsid_source(fhp)) {
1641                 case FSIDSOURCE_FSID:
1642                         WRITE64((u64)exp->ex_fsid);
1643                         WRITE64((u64)0);
1644                         break;
1645                 case FSIDSOURCE_DEV:
1646                         WRITE32(0);
1647                         WRITE32(MAJOR(stat.dev));
1648                         WRITE32(0);
1649                         WRITE32(MINOR(stat.dev));
1650                         break;
1651                 case FSIDSOURCE_UUID:
1652                         WRITEMEM(exp->ex_uuid, 16);
1653                         break;
1654                 }
1655         }
1656         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1657                 if ((buflen -= 4) < 0)
1658                         goto out_resource;
1659                 WRITE32(0);
1660         }
1661         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1662                 if ((buflen -= 4) < 0)
1663                         goto out_resource;
1664                 WRITE32(NFSD_LEASE_TIME);
1665         }
1666         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1667                 if ((buflen -= 4) < 0)
1668                         goto out_resource;
1669                 WRITE32(rdattr_err);
1670         }
1671         if (bmval0 & FATTR4_WORD0_ACL) {
1672                 struct nfs4_ace *ace;
1673
1674                 if (acl == NULL) {
1675                         if ((buflen -= 4) < 0)
1676                                 goto out_resource;
1677
1678                         WRITE32(0);
1679                         goto out_acl;
1680                 }
1681                 if ((buflen -= 4) < 0)
1682                         goto out_resource;
1683                 WRITE32(acl->naces);
1684
1685                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1686                         if ((buflen -= 4*3) < 0)
1687                                 goto out_resource;
1688                         WRITE32(ace->type);
1689                         WRITE32(ace->flag);
1690                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1691                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1692                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1693                                 &p, &buflen);
1694                         if (status == nfserr_resource)
1695                                 goto out_resource;
1696                         if (status)
1697                                 goto out;
1698                 }
1699         }
1700 out_acl:
1701         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1702                 if ((buflen -= 4) < 0)
1703                         goto out_resource;
1704                 WRITE32(aclsupport ?
1705                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1706         }
1707         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1708                 if ((buflen -= 4) < 0)
1709                         goto out_resource;
1710                 WRITE32(1);
1711         }
1712         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1713                 if ((buflen -= 4) < 0)
1714                         goto out_resource;
1715                 WRITE32(1);
1716         }
1717         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1718                 if ((buflen -= 4) < 0)
1719                         goto out_resource;
1720                 WRITE32(1);
1721         }
1722         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1723                 if ((buflen -= 4) < 0)
1724                         goto out_resource;
1725                 WRITE32(1);
1726         }
1727         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1728                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1729                 if (buflen < 0)
1730                         goto out_resource;
1731                 WRITE32(fhp->fh_handle.fh_size);
1732                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1733         }
1734         if (bmval0 & FATTR4_WORD0_FILEID) {
1735                 if ((buflen -= 8) < 0)
1736                         goto out_resource;
1737                 WRITE64(stat.ino);
1738         }
1739         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1740                 if ((buflen -= 8) < 0)
1741                         goto out_resource;
1742                 WRITE64((u64) statfs.f_ffree);
1743         }
1744         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1745                 if ((buflen -= 8) < 0)
1746                         goto out_resource;
1747                 WRITE64((u64) statfs.f_ffree);
1748         }
1749         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1750                 if ((buflen -= 8) < 0)
1751                         goto out_resource;
1752                 WRITE64((u64) statfs.f_files);
1753         }
1754         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1755                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1756                 if (status == nfserr_resource)
1757                         goto out_resource;
1758                 if (status)
1759                         goto out;
1760         }
1761         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1762                 if ((buflen -= 4) < 0)
1763                         goto out_resource;
1764                 WRITE32(1);
1765         }
1766         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1767                 if ((buflen -= 8) < 0)
1768                         goto out_resource;
1769                 WRITE64(~(u64)0);
1770         }
1771         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1772                 if ((buflen -= 4) < 0)
1773                         goto out_resource;
1774                 WRITE32(255);
1775         }
1776         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1777                 if ((buflen -= 4) < 0)
1778                         goto out_resource;
1779                 WRITE32(statfs.f_namelen);
1780         }
1781         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1782                 if ((buflen -= 8) < 0)
1783                         goto out_resource;
1784                 WRITE64((u64) svc_max_payload(rqstp));
1785         }
1786         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1787                 if ((buflen -= 8) < 0)
1788                         goto out_resource;
1789                 WRITE64((u64) svc_max_payload(rqstp));
1790         }
1791         if (bmval1 & FATTR4_WORD1_MODE) {
1792                 if ((buflen -= 4) < 0)
1793                         goto out_resource;
1794                 WRITE32(stat.mode & S_IALLUGO);
1795         }
1796         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1797                 if ((buflen -= 4) < 0)
1798                         goto out_resource;
1799                 WRITE32(1);
1800         }
1801         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1802                 if ((buflen -= 4) < 0)
1803                         goto out_resource;
1804                 WRITE32(stat.nlink);
1805         }
1806         if (bmval1 & FATTR4_WORD1_OWNER) {
1807                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1808                 if (status == nfserr_resource)
1809                         goto out_resource;
1810                 if (status)
1811                         goto out;
1812         }
1813         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1814                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1815                 if (status == nfserr_resource)
1816                         goto out_resource;
1817                 if (status)
1818                         goto out;
1819         }
1820         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1821                 if ((buflen -= 8) < 0)
1822                         goto out_resource;
1823                 WRITE32((u32) MAJOR(stat.rdev));
1824                 WRITE32((u32) MINOR(stat.rdev));
1825         }
1826         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1827                 if ((buflen -= 8) < 0)
1828                         goto out_resource;
1829                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1830                 WRITE64(dummy64);
1831         }
1832         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1833                 if ((buflen -= 8) < 0)
1834                         goto out_resource;
1835                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1836                 WRITE64(dummy64);
1837         }
1838         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1839                 if ((buflen -= 8) < 0)
1840                         goto out_resource;
1841                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1842                 WRITE64(dummy64);
1843         }
1844         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1845                 if ((buflen -= 8) < 0)
1846                         goto out_resource;
1847                 dummy64 = (u64)stat.blocks << 9;
1848                 WRITE64(dummy64);
1849         }
1850         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1851                 if ((buflen -= 12) < 0)
1852                         goto out_resource;
1853                 WRITE32(0);
1854                 WRITE32(stat.atime.tv_sec);
1855                 WRITE32(stat.atime.tv_nsec);
1856         }
1857         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1858                 if ((buflen -= 12) < 0)
1859                         goto out_resource;
1860                 WRITE32(0);
1861                 WRITE32(1);
1862                 WRITE32(0);
1863         }
1864         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1865                 if ((buflen -= 12) < 0)
1866                         goto out_resource;
1867                 WRITE32(0);
1868                 WRITE32(stat.ctime.tv_sec);
1869                 WRITE32(stat.ctime.tv_nsec);
1870         }
1871         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1872                 if ((buflen -= 12) < 0)
1873                         goto out_resource;
1874                 WRITE32(0);
1875                 WRITE32(stat.mtime.tv_sec);
1876                 WRITE32(stat.mtime.tv_nsec);
1877         }
1878         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1879                 if ((buflen -= 8) < 0)
1880                         goto out_resource;
1881                 /*
1882                  * Get parent's attributes if not ignoring crossmount
1883                  * and this is the root of a cross-mounted filesystem.
1884                  */
1885                 if (ignore_crossmnt == 0 &&
1886                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
1887                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
1888                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
1889                         if (err)
1890                                 goto out_nfserr;
1891                 }
1892                 WRITE64(stat.ino);
1893         }
1894         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1895         *countp = p - buffer;
1896         status = nfs_ok;
1897
1898 out:
1899         kfree(acl);
1900         if (fhp == &tempfh)
1901                 fh_put(&tempfh);
1902         return status;
1903 out_nfserr:
1904         status = nfserrno(err);
1905         goto out;
1906 out_resource:
1907         *countp = 0;
1908         status = nfserr_resource;
1909         goto out;
1910 out_serverfault:
1911         status = nfserr_serverfault;
1912         goto out;
1913 }
1914
1915 static inline int attributes_need_mount(u32 *bmval)
1916 {
1917         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
1918                 return 1;
1919         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
1920                 return 1;
1921         return 0;
1922 }
1923
1924 static __be32
1925 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1926                 const char *name, int namlen, __be32 *p, int *buflen)
1927 {
1928         struct svc_export *exp = cd->rd_fhp->fh_export;
1929         struct dentry *dentry;
1930         __be32 nfserr;
1931         int ignore_crossmnt = 0;
1932
1933         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1934         if (IS_ERR(dentry))
1935                 return nfserrno(PTR_ERR(dentry));
1936
1937         exp_get(exp);
1938         /*
1939          * In the case of a mountpoint, the client may be asking for
1940          * attributes that are only properties of the underlying filesystem
1941          * as opposed to the cross-mounted file system. In such a case,
1942          * we will not follow the cross mount and will fill the attribtutes
1943          * directly from the mountpoint dentry.
1944          */
1945         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
1946                 ignore_crossmnt = 1;
1947         else if (d_mountpoint(dentry)) {
1948                 int err;
1949
1950                 /*
1951                  * Why the heck aren't we just using nfsd_lookup??
1952                  * Different "."/".." handling?  Something else?
1953                  * At least, add a comment here to explain....
1954                  */
1955                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1956                 if (err) {
1957                         nfserr = nfserrno(err);
1958                         goto out_put;
1959                 }
1960                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
1961                 if (nfserr)
1962                         goto out_put;
1963
1964         }
1965         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1966                                         cd->rd_rqstp, ignore_crossmnt);
1967 out_put:
1968         dput(dentry);
1969         exp_put(exp);
1970         return nfserr;
1971 }
1972
1973 static __be32 *
1974 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1975 {
1976         __be32 *attrlenp;
1977
1978         if (buflen < 6)
1979                 return NULL;
1980         *p++ = htonl(2);
1981         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1982         *p++ = htonl(0);                         /* bmval1 */
1983
1984         attrlenp = p++;
1985         *p++ = nfserr;       /* no htonl */
1986         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1987         return p;
1988 }
1989
1990 static int
1991 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1992                     loff_t offset, u64 ino, unsigned int d_type)
1993 {
1994         struct readdir_cd *ccd = ccdv;
1995         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1996         int buflen;
1997         __be32 *p = cd->buffer;
1998         __be32 nfserr = nfserr_toosmall;
1999
2000         /* In nfsv4, "." and ".." never make it onto the wire.. */
2001         if (name && isdotent(name, namlen)) {
2002                 cd->common.err = nfs_ok;
2003                 return 0;
2004         }
2005
2006         if (cd->offset)
2007                 xdr_encode_hyper(cd->offset, (u64) offset);
2008
2009         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2010         if (buflen < 0)
2011                 goto fail;
2012
2013         *p++ = xdr_one;                             /* mark entry present */
2014         cd->offset = p;                             /* remember pointer */
2015         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2016         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2017
2018         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2019         switch (nfserr) {
2020         case nfs_ok:
2021                 p += buflen;
2022                 break;
2023         case nfserr_resource:
2024                 nfserr = nfserr_toosmall;
2025                 goto fail;
2026         case nfserr_dropit:
2027                 goto fail;
2028         default:
2029                 /*
2030                  * If the client requested the RDATTR_ERROR attribute,
2031                  * we stuff the error code into this attribute
2032                  * and continue.  If this attribute was not requested,
2033                  * then in accordance with the spec, we fail the
2034                  * entire READDIR operation(!)
2035                  */
2036                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2037                         goto fail;
2038                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2039                 if (p == NULL) {
2040                         nfserr = nfserr_toosmall;
2041                         goto fail;
2042                 }
2043         }
2044         cd->buflen -= (p - cd->buffer);
2045         cd->buffer = p;
2046         cd->common.err = nfs_ok;
2047         return 0;
2048 fail:
2049         cd->common.err = nfserr;
2050         return -EINVAL;
2051 }
2052
2053 static void
2054 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2055 {
2056         ENCODE_HEAD;
2057
2058         RESERVE_SPACE(sizeof(stateid_t));
2059         WRITE32(sid->si_generation);
2060         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2061         ADJUST_ARGS();
2062 }
2063
2064 static __be32
2065 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2066 {
2067         ENCODE_HEAD;
2068
2069         if (!nfserr) {
2070                 RESERVE_SPACE(8);
2071                 WRITE32(access->ac_supported);
2072                 WRITE32(access->ac_resp_access);
2073                 ADJUST_ARGS();
2074         }
2075         return nfserr;
2076 }
2077
2078 static __be32
2079 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2080 {
2081         ENCODE_SEQID_OP_HEAD;
2082
2083         if (!nfserr)
2084                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2085
2086         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2087         return nfserr;
2088 }
2089
2090
2091 static __be32
2092 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2093 {
2094         ENCODE_HEAD;
2095
2096         if (!nfserr) {
2097                 RESERVE_SPACE(8);
2098                 WRITEMEM(commit->co_verf.data, 8);
2099                 ADJUST_ARGS();
2100         }
2101         return nfserr;
2102 }
2103
2104 static __be32
2105 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2106 {
2107         ENCODE_HEAD;
2108
2109         if (!nfserr) {
2110                 RESERVE_SPACE(32);
2111                 WRITECINFO(create->cr_cinfo);
2112                 WRITE32(2);
2113                 WRITE32(create->cr_bmval[0]);
2114                 WRITE32(create->cr_bmval[1]);
2115                 ADJUST_ARGS();
2116         }
2117         return nfserr;
2118 }
2119
2120 static __be32
2121 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2122 {
2123         struct svc_fh *fhp = getattr->ga_fhp;
2124         int buflen;
2125
2126         if (nfserr)
2127                 return nfserr;
2128
2129         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2130         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2131                                     resp->p, &buflen, getattr->ga_bmval,
2132                                     resp->rqstp, 0);
2133         if (!nfserr)
2134                 resp->p += buflen;
2135         return nfserr;
2136 }
2137
2138 static __be32
2139 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2140 {
2141         struct svc_fh *fhp = *fhpp;
2142         unsigned int len;
2143         ENCODE_HEAD;
2144
2145         if (!nfserr) {
2146                 len = fhp->fh_handle.fh_size;
2147                 RESERVE_SPACE(len + 4);
2148                 WRITE32(len);
2149                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2150                 ADJUST_ARGS();
2151         }
2152         return nfserr;
2153 }
2154
2155 /*
2156 * Including all fields other than the name, a LOCK4denied structure requires
2157 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2158 */
2159 static void
2160 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2161 {
2162         ENCODE_HEAD;
2163
2164         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2165         WRITE64(ld->ld_start);
2166         WRITE64(ld->ld_length);
2167         WRITE32(ld->ld_type);
2168         if (ld->ld_sop) {
2169                 WRITEMEM(&ld->ld_clientid, 8);
2170                 WRITE32(ld->ld_sop->so_owner.len);
2171                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2172                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2173         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2174                 WRITE64((u64)0); /* clientid */
2175                 WRITE32(0); /* length of owner name */
2176         }
2177         ADJUST_ARGS();
2178 }
2179
2180 static __be32
2181 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2182 {
2183         ENCODE_SEQID_OP_HEAD;
2184
2185         if (!nfserr)
2186                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2187         else if (nfserr == nfserr_denied)
2188                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2189
2190         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2191         return nfserr;
2192 }
2193
2194 static __be32
2195 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2196 {
2197         if (nfserr == nfserr_denied)
2198                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2199         return nfserr;
2200 }
2201
2202 static __be32
2203 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2204 {
2205         ENCODE_SEQID_OP_HEAD;
2206
2207         if (!nfserr)
2208                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2209
2210         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2211         return nfserr;
2212 }
2213
2214
2215 static __be32
2216 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2217 {
2218         ENCODE_HEAD;
2219
2220         if (!nfserr) {
2221                 RESERVE_SPACE(20);
2222                 WRITECINFO(link->li_cinfo);
2223                 ADJUST_ARGS();
2224         }
2225         return nfserr;
2226 }
2227
2228
2229 static __be32
2230 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2231 {
2232         ENCODE_HEAD;
2233         ENCODE_SEQID_OP_HEAD;
2234
2235         if (nfserr)
2236                 goto out;
2237
2238         nfsd4_encode_stateid(resp, &open->op_stateid);
2239         RESERVE_SPACE(40);
2240         WRITECINFO(open->op_cinfo);
2241         WRITE32(open->op_rflags);
2242         WRITE32(2);
2243         WRITE32(open->op_bmval[0]);
2244         WRITE32(open->op_bmval[1]);
2245         WRITE32(open->op_delegate_type);
2246         ADJUST_ARGS();
2247
2248         switch (open->op_delegate_type) {
2249         case NFS4_OPEN_DELEGATE_NONE:
2250                 break;
2251         case NFS4_OPEN_DELEGATE_READ:
2252                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2253                 RESERVE_SPACE(20);
2254                 WRITE32(open->op_recall);
2255
2256                 /*
2257                  * TODO: ACE's in delegations
2258                  */
2259                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2260                 WRITE32(0);
2261                 WRITE32(0);
2262                 WRITE32(0);   /* XXX: is NULL principal ok? */
2263                 ADJUST_ARGS();
2264                 break;
2265         case NFS4_OPEN_DELEGATE_WRITE:
2266                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2267                 RESERVE_SPACE(32);
2268                 WRITE32(0);
2269
2270                 /*
2271                  * TODO: space_limit's in delegations
2272                  */
2273                 WRITE32(NFS4_LIMIT_SIZE);
2274                 WRITE32(~(u32)0);
2275                 WRITE32(~(u32)0);
2276
2277                 /*
2278                  * TODO: ACE's in delegations
2279                  */
2280                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2281                 WRITE32(0);
2282                 WRITE32(0);
2283                 WRITE32(0);   /* XXX: is NULL principal ok? */
2284                 ADJUST_ARGS();
2285                 break;
2286         default:
2287                 BUG();
2288         }
2289         /* XXX save filehandle here */
2290 out:
2291         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2292         return nfserr;
2293 }
2294
2295 static __be32
2296 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2297 {
2298         ENCODE_SEQID_OP_HEAD;
2299
2300         if (!nfserr)
2301                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2302
2303         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2304         return nfserr;
2305 }
2306
2307 static __be32
2308 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2309 {
2310         ENCODE_SEQID_OP_HEAD;
2311
2312         if (!nfserr)
2313                 nfsd4_encode_stateid(resp, &od->od_stateid);
2314
2315         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2316         return nfserr;
2317 }
2318
2319 static __be32
2320 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2321                   struct nfsd4_read *read)
2322 {
2323         u32 eof;
2324         int v, pn;
2325         unsigned long maxcount;
2326         long len;
2327         ENCODE_HEAD;
2328
2329         if (nfserr)
2330                 return nfserr;
2331         if (resp->xbuf->page_len)
2332                 return nfserr_resource;
2333
2334         RESERVE_SPACE(8); /* eof flag and byte count */
2335
2336         maxcount = svc_max_payload(resp->rqstp);
2337         if (maxcount > read->rd_length)
2338                 maxcount = read->rd_length;
2339
2340         len = maxcount;
2341         v = 0;
2342         while (len > 0) {
2343                 pn = resp->rqstp->rq_resused++;
2344                 resp->rqstp->rq_vec[v].iov_base =
2345                         page_address(resp->rqstp->rq_respages[pn]);
2346                 resp->rqstp->rq_vec[v].iov_len =
2347                         len < PAGE_SIZE ? len : PAGE_SIZE;
2348                 v++;
2349                 len -= PAGE_SIZE;
2350         }
2351         read->rd_vlen = v;
2352
2353         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2354                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2355                         &maxcount);
2356
2357         if (nfserr == nfserr_symlink)
2358                 nfserr = nfserr_inval;
2359         if (nfserr)
2360                 return nfserr;
2361         eof = (read->rd_offset + maxcount >=
2362                read->rd_fhp->fh_dentry->d_inode->i_size);
2363
2364         WRITE32(eof);
2365         WRITE32(maxcount);
2366         ADJUST_ARGS();
2367         resp->xbuf->head[0].iov_len = (char*)p
2368                                         - (char*)resp->xbuf->head[0].iov_base;
2369         resp->xbuf->page_len = maxcount;
2370
2371         /* Use rest of head for padding and remaining ops: */
2372         resp->xbuf->tail[0].iov_base = p;
2373         resp->xbuf->tail[0].iov_len = 0;
2374         if (maxcount&3) {
2375                 RESERVE_SPACE(4);
2376                 WRITE32(0);
2377                 resp->xbuf->tail[0].iov_base += maxcount&3;
2378                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2379                 ADJUST_ARGS();
2380         }
2381         return 0;
2382 }
2383
2384 static __be32
2385 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2386 {
2387         int maxcount;
2388         char *page;
2389         ENCODE_HEAD;
2390
2391         if (nfserr)
2392                 return nfserr;
2393         if (resp->xbuf->page_len)
2394                 return nfserr_resource;
2395
2396         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2397
2398         maxcount = PAGE_SIZE;
2399         RESERVE_SPACE(4);
2400
2401         /*
2402          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2403          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2404          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2405          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2406          */
2407         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2408         if (nfserr == nfserr_isdir)
2409                 return nfserr_inval;
2410         if (nfserr)
2411                 return nfserr;
2412
2413         WRITE32(maxcount);
2414         ADJUST_ARGS();
2415         resp->xbuf->head[0].iov_len = (char*)p
2416                                 - (char*)resp->xbuf->head[0].iov_base;
2417         resp->xbuf->page_len = maxcount;
2418
2419         /* Use rest of head for padding and remaining ops: */
2420         resp->xbuf->tail[0].iov_base = p;
2421         resp->xbuf->tail[0].iov_len = 0;
2422         if (maxcount&3) {
2423                 RESERVE_SPACE(4);
2424                 WRITE32(0);
2425                 resp->xbuf->tail[0].iov_base += maxcount&3;
2426                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2427                 ADJUST_ARGS();
2428         }
2429         return 0;
2430 }
2431
2432 static __be32
2433 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2434 {
2435         int maxcount;
2436         loff_t offset;
2437         __be32 *page, *savep, *tailbase;
2438         ENCODE_HEAD;
2439
2440         if (nfserr)
2441                 return nfserr;
2442         if (resp->xbuf->page_len)
2443                 return nfserr_resource;
2444
2445         RESERVE_SPACE(8);  /* verifier */
2446         savep = p;
2447
2448         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2449         WRITE32(0);
2450         WRITE32(0);
2451         ADJUST_ARGS();
2452         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2453         tailbase = p;
2454
2455         maxcount = PAGE_SIZE;
2456         if (maxcount > readdir->rd_maxcount)
2457                 maxcount = readdir->rd_maxcount;
2458
2459         /*
2460          * Convert from bytes to words, account for the two words already
2461          * written, make sure to leave two words at the end for the next
2462          * pointer and eof field.
2463          */
2464         maxcount = (maxcount >> 2) - 4;
2465         if (maxcount < 0) {
2466                 nfserr =  nfserr_toosmall;
2467                 goto err_no_verf;
2468         }
2469
2470         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2471         readdir->common.err = 0;
2472         readdir->buflen = maxcount;
2473         readdir->buffer = page;
2474         readdir->offset = NULL;
2475
2476         offset = readdir->rd_cookie;
2477         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2478                               &offset,
2479                               &readdir->common, nfsd4_encode_dirent);
2480         if (nfserr == nfs_ok &&
2481             readdir->common.err == nfserr_toosmall &&
2482             readdir->buffer == page)
2483                 nfserr = nfserr_toosmall;
2484         if (nfserr == nfserr_symlink)
2485                 nfserr = nfserr_notdir;
2486         if (nfserr)
2487                 goto err_no_verf;
2488
2489         if (readdir->offset)
2490                 xdr_encode_hyper(readdir->offset, offset);
2491
2492         p = readdir->buffer;
2493         *p++ = 0;       /* no more entries */
2494         *p++ = htonl(readdir->common.err == nfserr_eof);
2495         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2496                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2497
2498         /* Use rest of head for padding and remaining ops: */
2499         resp->xbuf->tail[0].iov_base = tailbase;
2500         resp->xbuf->tail[0].iov_len = 0;
2501         resp->p = resp->xbuf->tail[0].iov_base;
2502         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2503
2504         return 0;
2505 err_no_verf:
2506         p = savep;
2507         ADJUST_ARGS();
2508         return nfserr;
2509 }
2510
2511 static __be32
2512 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2513 {
2514         ENCODE_HEAD;
2515
2516         if (!nfserr) {
2517                 RESERVE_SPACE(20);
2518                 WRITECINFO(remove->rm_cinfo);
2519                 ADJUST_ARGS();
2520         }
2521         return nfserr;
2522 }
2523
2524 static __be32
2525 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2526 {
2527         ENCODE_HEAD;
2528
2529         if (!nfserr) {
2530                 RESERVE_SPACE(40);
2531                 WRITECINFO(rename->rn_sinfo);
2532                 WRITECINFO(rename->rn_tinfo);
2533                 ADJUST_ARGS();
2534         }
2535         return nfserr;
2536 }
2537
2538 static __be32
2539 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2540                      struct nfsd4_secinfo *secinfo)
2541 {
2542         int i = 0;
2543         struct svc_export *exp = secinfo->si_exp;
2544         u32 nflavs;
2545         struct exp_flavor_info *flavs;
2546         struct exp_flavor_info def_flavs[2];
2547         ENCODE_HEAD;
2548
2549         if (nfserr)
2550                 goto out;
2551         if (exp->ex_nflavors) {
2552                 flavs = exp->ex_flavors;
2553                 nflavs = exp->ex_nflavors;
2554         } else { /* Handling of some defaults in absence of real secinfo: */
2555                 flavs = def_flavs;
2556                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2557                         nflavs = 2;
2558                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2559                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2560                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2561                         nflavs = 1;
2562                         flavs[0].pseudoflavor
2563                                         = svcauth_gss_flavor(exp->ex_client);
2564                 } else {
2565                         nflavs = 1;
2566                         flavs[0].pseudoflavor
2567                                         = exp->ex_client->flavour->flavour;
2568                 }
2569         }
2570
2571         RESERVE_SPACE(4);
2572         WRITE32(nflavs);
2573         ADJUST_ARGS();
2574         for (i = 0; i < nflavs; i++) {
2575                 u32 flav = flavs[i].pseudoflavor;
2576                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2577
2578                 if (gm) {
2579                         RESERVE_SPACE(4);
2580                         WRITE32(RPC_AUTH_GSS);
2581                         ADJUST_ARGS();
2582                         RESERVE_SPACE(4 + gm->gm_oid.len);
2583                         WRITE32(gm->gm_oid.len);
2584                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2585                         ADJUST_ARGS();
2586                         RESERVE_SPACE(4);
2587                         WRITE32(0); /* qop */
2588                         ADJUST_ARGS();
2589                         RESERVE_SPACE(4);
2590                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2591                         ADJUST_ARGS();
2592                         gss_mech_put(gm);
2593                 } else {
2594                         RESERVE_SPACE(4);
2595                         WRITE32(flav);
2596                         ADJUST_ARGS();
2597                 }
2598         }
2599 out:
2600         if (exp)
2601                 exp_put(exp);
2602         return nfserr;
2603 }
2604
2605 /*
2606  * The SETATTR encode routine is special -- it always encodes a bitmap,
2607  * regardless of the error status.
2608  */
2609 static __be32
2610 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2611 {
2612         ENCODE_HEAD;
2613
2614         RESERVE_SPACE(12);
2615         if (nfserr) {
2616                 WRITE32(2);
2617                 WRITE32(0);
2618                 WRITE32(0);
2619         }
2620         else {
2621                 WRITE32(2);
2622                 WRITE32(setattr->sa_bmval[0]);
2623                 WRITE32(setattr->sa_bmval[1]);
2624         }
2625         ADJUST_ARGS();
2626         return nfserr;
2627 }
2628
2629 static __be32
2630 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2631 {
2632         ENCODE_HEAD;
2633
2634         if (!nfserr) {
2635                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2636                 WRITEMEM(&scd->se_clientid, 8);
2637                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2638                 ADJUST_ARGS();
2639         }
2640         else if (nfserr == nfserr_clid_inuse) {
2641                 RESERVE_SPACE(8);
2642                 WRITE32(0);
2643                 WRITE32(0);
2644                 ADJUST_ARGS();
2645         }
2646         return nfserr;
2647 }
2648
2649 static __be32
2650 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2651 {
2652         ENCODE_HEAD;
2653
2654         if (!nfserr) {
2655                 RESERVE_SPACE(16);
2656                 WRITE32(write->wr_bytes_written);
2657                 WRITE32(write->wr_how_written);
2658                 WRITEMEM(write->wr_verifier.data, 8);
2659                 ADJUST_ARGS();
2660         }
2661         return nfserr;
2662 }
2663
2664 static __be32
2665 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2666                          struct nfsd4_exchange_id *exid)
2667 {
2668         /* stub */
2669         return nfserr;
2670 }
2671
2672 static __be32
2673 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
2674                             struct nfsd4_create_session *sess)
2675 {
2676         /* stub */
2677         return nfserr;
2678 }
2679
2680 static __be32
2681 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
2682                              struct nfsd4_destroy_session *destroy_session)
2683 {
2684         /* stub */
2685         return nfserr;
2686 }
2687
2688 static __be32
2689 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
2690                       struct nfsd4_sequence *seq)
2691 {
2692         /* stub */
2693         return nfserr;
2694 }
2695
2696 static __be32
2697 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
2698 {
2699         return nfserr;
2700 }
2701
2702 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
2703
2704 /*
2705  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
2706  * since we don't need to filter out obsolete ops as this is
2707  * done in the decoding phase.
2708  */
2709 static nfsd4_enc nfsd4_enc_ops[] = {
2710         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
2711         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
2712         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
2713         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
2714         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
2715         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
2716         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
2717         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
2718         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
2719         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
2720         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
2721         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
2722         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
2723         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
2724         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
2725         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
2726         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
2727         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
2728         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
2729         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
2730         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
2731         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
2732         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
2733         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
2734         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
2735         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
2736         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
2737         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
2738         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
2739         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
2740         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
2741         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
2742         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
2743         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
2744         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
2745         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
2746         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
2747
2748         /* NFSv4.1 operations */
2749         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
2750         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
2751         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
2752         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
2753         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
2754         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
2755         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
2756         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
2757         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
2758         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
2759         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
2760         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
2761         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
2762         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
2763         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
2764         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
2765         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
2766         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
2767         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
2768 };
2769
2770 void
2771 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2772 {
2773         __be32 *statp;
2774         ENCODE_HEAD;
2775
2776         RESERVE_SPACE(8);
2777         WRITE32(op->opnum);
2778         statp = p++;    /* to be backfilled at the end */
2779         ADJUST_ARGS();
2780
2781         if (op->opnum == OP_ILLEGAL)
2782                 goto status;
2783         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
2784                !nfsd4_enc_ops[op->opnum]);
2785         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
2786 status:
2787         /*
2788          * Note: We write the status directly, instead of using WRITE32(),
2789          * since it is already in network byte order.
2790          */
2791         *statp = op->status;
2792 }
2793
2794 /*
2795  * Encode the reply stored in the stateowner reply cache
2796  *
2797  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2798  * previously sent already encoded operation.
2799  *
2800  * called with nfs4_lock_state() held
2801  */
2802 void
2803 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2804 {
2805         ENCODE_HEAD;
2806         struct nfs4_replay *rp = op->replay;
2807
2808         BUG_ON(!rp);
2809
2810         RESERVE_SPACE(8);
2811         WRITE32(op->opnum);
2812         *p++ = rp->rp_status;  /* already xdr'ed */
2813         ADJUST_ARGS();
2814
2815         RESERVE_SPACE(rp->rp_buflen);
2816         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2817         ADJUST_ARGS();
2818 }
2819
2820 /*
2821  * END OF "GENERIC" ENCODE ROUTINES.
2822  */
2823
2824 int
2825 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2826 {
2827         return xdr_ressize_check(rqstp, p);
2828 }
2829
2830 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2831 {
2832         if (args->ops != args->iops) {
2833                 kfree(args->ops);
2834                 args->ops = args->iops;
2835         }
2836         kfree(args->tmpp);
2837         args->tmpp = NULL;
2838         while (args->to_free) {
2839                 struct tmpbuf *tb = args->to_free;
2840                 args->to_free = tb->next;
2841                 tb->release(tb->buf);
2842                 kfree(tb);
2843         }
2844 }
2845
2846 int
2847 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2848 {
2849         __be32 status;
2850
2851         args->p = p;
2852         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2853         args->pagelist = rqstp->rq_arg.pages;
2854         args->pagelen = rqstp->rq_arg.page_len;
2855         args->tmpp = NULL;
2856         args->to_free = NULL;
2857         args->ops = args->iops;
2858         args->rqstp = rqstp;
2859
2860         status = nfsd4_decode_compound(args);
2861         if (status) {
2862                 nfsd4_release_compoundargs(args);
2863         }
2864         return !status;
2865 }
2866
2867 int
2868 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2869 {
2870         /*
2871          * All that remains is to write the tag and operation count...
2872          */
2873         struct kvec *iov;
2874         p = resp->tagp;
2875         *p++ = htonl(resp->taglen);
2876         memcpy(p, resp->tag, resp->taglen);
2877         p += XDR_QUADLEN(resp->taglen);
2878         *p++ = htonl(resp->opcnt);
2879
2880         if (rqstp->rq_res.page_len)
2881                 iov = &rqstp->rq_res.tail[0];
2882         else
2883                 iov = &rqstp->rq_res.head[0];
2884         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2885         BUG_ON(iov->iov_len > PAGE_SIZE);
2886         return 1;
2887 }
2888
2889 /*
2890  * Local variables:
2891  *  c-basic-offset: 8
2892  * End:
2893  */