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   1 /*
   2  *  fs/nfs/nfs4xdr.c
   3  *
   4  *  Server-side XDR for NFSv4
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * TODO: Neil Brown made the following observation:  We currently
  38  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  39  * never release any of that until the request is complete.
  40  * It would be good to calculate a new maximum response size while
  41  * decoding the COMPOUND, and call svc_reserve with this number
  42  * at the end of nfs4svc_decode_compoundargs.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/smp.h>
  47 #include <linux/smp_lock.h>
  48 #include <linux/fs.h>
  49 #include <linux/namei.h>
  50 #include <linux/vfs.h>
  51 #include <linux/sunrpc/xdr.h>
  52 #include <linux/sunrpc/svc.h>
  53 #include <linux/sunrpc/clnt.h>
  54 #include <linux/nfsd/nfsd.h>
  55 #include <linux/nfsd/state.h>
  56 #include <linux/nfsd/xdr4.h>
  57 #include <linux/nfsd_idmap.h>
  58 #include <linux/nfs4.h>
  59 #include <linux/nfs4_acl.h>
  60
  61 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  62
  63 static int
  64 check_filename(char *str, int len, int err)
  65 {
  66         int i;
  67
  68         if (len == 0)
  69                 return nfserr_inval;
  70         if (isdotent(str, len))
  71                 return err;
  72         for (i = 0; i < len; i++)
  73                 if (str[i] == '/')
  74                         return err;
  75         return 0;
  76 }
  77
  78 /*
  79  * START OF "GENERIC" DECODE ROUTINES.
  80  *   These may look a little ugly since they are imported from a "generic"
  81  * set of XDR encode/decode routines which are intended to be shared by
  82  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  83  *
  84  * If the pain of reading these is too great, it should be a straightforward
  85  * task to translate them into Linux-specific versions which are more
  86  * consistent with the style used in NFSv2/v3...
  87  */
  88 #define DECODE_HEAD                             \
  89         u32 *p;                                 \
  90         int status
  91 #define DECODE_TAIL                             \
  92         status = 0;                             \
  93 out:                                            \
  94         return status;                          \
  95 xdr_error:                                      \
  96         printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
  97         status = nfserr_bad_xdr;                \
  98         goto out
  99
 100 #define READ32(x)         (x) = ntohl(*p++)
 101 #define READ64(x)         do {                  \
 102         (x) = (u64)ntohl(*p++) << 32;           \
 103         (x) |= ntohl(*p++);                     \
 104 } while (0)
 105 #define READTIME(x)       do {                  \
 106         p++;                                    \
 107         (x) = ntohl(*p++);                      \
 108         p++;                                    \
 109 } while (0)
 110 #define READMEM(x,nbytes) do {                  \
 111         x = (char *)p;                          \
 112         p += XDR_QUADLEN(nbytes);               \
 113 } while (0)
 114 #define SAVEMEM(x,nbytes) do {                  \
 115         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 116                 savemem(argp, p, nbytes) :      \
 117                 (char *)p)) {                   \
 118                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 119                 goto xdr_error;                 \
 120                 }                               \
 121         p += XDR_QUADLEN(nbytes);               \
 122 } while (0)
 123 #define COPYMEM(x,nbytes) do {                  \
 124         memcpy((x), p, nbytes);                 \
 125         p += XDR_QUADLEN(nbytes);               \
 126 } while (0)
 127
 128 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 129 #define READ_BUF(nbytes)  do {                  \
 130         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 131                 p = argp->p;                    \
 132                 argp->p += XDR_QUADLEN(nbytes); \
 133         } else if (!(p = read_buf(argp, nbytes))) { \
 134                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 135                 goto xdr_error;                 \
 136         }                                       \
 137 } while (0)
 138
 139 static u32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
 140 {
 141         /* We want more bytes than seem to be available.
 142          * Maybe we need a new page, maybe we have just run out
 143          */
 144         int avail = (char*)argp->end - (char*)argp->p;
 145         u32 *p;
 146         if (avail + argp->pagelen < nbytes)
 147                 return NULL;
 148         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 149                 return NULL;
 150         /* ok, we can do it with the current plus the next page */
 151         if (nbytes <= sizeof(argp->tmp))
 152                 p = argp->tmp;
 153         else {
 154                 kfree(argp->tmpp);
 155                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 156                 if (!p)
 157                         return NULL;
 158
 159         }
 160         memcpy(p, argp->p, avail);
 161         /* step to next page */
 162         argp->p = page_address(argp->pagelist[0]);
 163         argp->pagelist++;
 164         if (argp->pagelen < PAGE_SIZE) {
 165                 argp->end = p + (argp->pagelen>>2);
 166                 argp->pagelen = 0;
 167         } else {
 168                 argp->end = p + (PAGE_SIZE>>2);
 169                 argp->pagelen -= PAGE_SIZE;
 170         }
 171         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 172         argp->p += XDR_QUADLEN(nbytes - avail);
 173         return p;
 174 }
 175
 176 static int
 177 defer_free(struct nfsd4_compoundargs *argp,
 178                 void (*release)(const void *), void *p)
 179 {
 180         struct tmpbuf *tb;
 181
 182         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 183         if (!tb)
 184                 return -ENOMEM;
 185         tb->buf = p;
 186         tb->release = release;
 187         tb->next = argp->to_free;
 188         argp->to_free = tb;
 189         return 0;
 190 }
 191
 192 static char *savemem(struct nfsd4_compoundargs *argp, u32 *p, int nbytes)
 193 {
 194         void *new = NULL;
 195         if (p == argp->tmp) {
 196                 new = kmalloc(nbytes, GFP_KERNEL);
 197                 if (!new) return NULL;
 198                 p = new;
 199                 memcpy(p, argp->tmp, nbytes);
 200         } else {
 201                 BUG_ON(p != argp->tmpp);
 202                 argp->tmpp = NULL;
 203         }
 204         if (defer_free(argp, kfree, p)) {
 205                 kfree(new);
 206                 return NULL;
 207         } else
 208                 return (char *)p;
 209 }
 210
 211
 212 static int
 213 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 214 {
 215         u32 bmlen;
 216         DECODE_HEAD;
 217
 218         bmval[0] = 0;
 219         bmval[1] = 0;
 220
 221         READ_BUF(4);
 222         READ32(bmlen);
 223         if (bmlen > 1000)
 224                 goto xdr_error;
 225
 226         READ_BUF(bmlen << 2);
 227         if (bmlen > 0)
 228                 READ32(bmval[0]);
 229         if (bmlen > 1)
 230                 READ32(bmval[1]);
 231
 232         DECODE_TAIL;
 233 }
 234
 235 static int
 236 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 237     struct nfs4_acl **acl)
 238 {
 239         int expected_len, len = 0;
 240         u32 dummy32;
 241         char *buf;
 242
 243         DECODE_HEAD;
 244         iattr->ia_valid = 0;
 245         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 246                 return status;
 247
 248         /*
 249          * According to spec, unsupported attributes return ERR_NOTSUPP;
 250          * read-only attributes return ERR_INVAL.
 251          */
 252         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 253                 return nfserr_attrnotsupp;
 254         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 255                 return nfserr_inval;
 256
 257         READ_BUF(4);
 258         READ32(expected_len);
 259
 260         if (bmval[0] & FATTR4_WORD0_SIZE) {
 261                 READ_BUF(8);
 262                 len += 8;
 263                 READ64(iattr->ia_size);
 264                 iattr->ia_valid |= ATTR_SIZE;
 265         }
 266         if (bmval[0] & FATTR4_WORD0_ACL) {
 267                 int nace, i;
 268                 struct nfs4_ace ace;
 269
 270                 READ_BUF(4); len += 4;
 271                 READ32(nace);
 272
 273                 *acl = nfs4_acl_new();
 274                 if (*acl == NULL) {
 275                         status = -ENOMEM;
 276                         goto out_nfserr;
 277                 }
 278                 defer_free(argp, (void (*)(const void *))nfs4_acl_free, *acl);
 279
 280                 for (i = 0; i < nace; i++) {
 281                         READ_BUF(16); len += 16;
 282                         READ32(ace.type);
 283                         READ32(ace.flag);
 284                         READ32(ace.access_mask);
 285                         READ32(dummy32);
 286                         READ_BUF(dummy32);
 287                         len += XDR_QUADLEN(dummy32) << 2;
 288                         READMEM(buf, dummy32);
 289                         ace.whotype = nfs4_acl_get_whotype(buf, dummy32);
 290                         status = 0;
 291                         if (ace.whotype != NFS4_ACL_WHO_NAMED)
 292                                 ace.who = 0;
 293                         else if (ace.flag & NFS4_ACE_IDENTIFIER_GROUP)
 294                                 status = nfsd_map_name_to_gid(argp->rqstp,
 295                                                 buf, dummy32, &ace.who);
 296                         else
 297                                 status = nfsd_map_name_to_uid(argp->rqstp,
 298                                                 buf, dummy32, &ace.who);
 299                         if (status)
 300                                 goto out_nfserr;
 301                         status = nfs4_acl_add_ace(*acl, ace.type, ace.flag,
 302                                  ace.access_mask, ace.whotype, ace.who);
 303                         if (status)
 304                                 goto out_nfserr;
 305                 }
 306         } else
 307                 *acl = NULL;
 308         if (bmval[1] & FATTR4_WORD1_MODE) {
 309                 READ_BUF(4);
 310                 len += 4;
 311                 READ32(iattr->ia_mode);
 312                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 313                 iattr->ia_valid |= ATTR_MODE;
 314         }
 315         if (bmval[1] & FATTR4_WORD1_OWNER) {
 316                 READ_BUF(4);
 317                 len += 4;
 318                 READ32(dummy32);
 319                 READ_BUF(dummy32);
 320                 len += (XDR_QUADLEN(dummy32) << 2);
 321                 READMEM(buf, dummy32);
 322                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 323                         goto out_nfserr;
 324                 iattr->ia_valid |= ATTR_UID;
 325         }
 326         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 327                 READ_BUF(4);
 328                 len += 4;
 329                 READ32(dummy32);
 330                 READ_BUF(dummy32);
 331                 len += (XDR_QUADLEN(dummy32) << 2);
 332                 READMEM(buf, dummy32);
 333                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 334                         goto out_nfserr;
 335                 iattr->ia_valid |= ATTR_GID;
 336         }
 337         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 338                 READ_BUF(4);
 339                 len += 4;
 340                 READ32(dummy32);
 341                 switch (dummy32) {
 342                 case NFS4_SET_TO_CLIENT_TIME:
 343                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 344                            all 32 bits of 'nseconds'. */
 345                         READ_BUF(12);
 346                         len += 12;
 347                         READ32(dummy32);
 348                         if (dummy32)
 349                                 return nfserr_inval;
 350                         READ32(iattr->ia_atime.tv_sec);
 351                         READ32(iattr->ia_atime.tv_nsec);
 352                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 353                                 return nfserr_inval;
 354                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 355                         break;
 356                 case NFS4_SET_TO_SERVER_TIME:
 357                         iattr->ia_valid |= ATTR_ATIME;
 358                         break;
 359                 default:
 360                         goto xdr_error;
 361                 }
 362         }
 363         if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
 364                 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 365                    all 32 bits of 'nseconds'. */
 366                 READ_BUF(12);
 367                 len += 12;
 368                 READ32(dummy32);
 369                 if (dummy32)
 370                         return nfserr_inval;
 371                 READ32(iattr->ia_ctime.tv_sec);
 372                 READ32(iattr->ia_ctime.tv_nsec);
 373                 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
 374                         return nfserr_inval;
 375                 iattr->ia_valid |= ATTR_CTIME;
 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(status);
 410         goto out;
 411 }
 412
 413 static int
 414 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 415 {
 416         DECODE_HEAD;
 417
 418         READ_BUF(4);
 419         READ32(access->ac_req_access);
 420
 421         DECODE_TAIL;
 422 }
 423
 424 static int
 425 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 426 {
 427         DECODE_HEAD;
 428
 429         close->cl_stateowner = NULL;
 430         READ_BUF(4 + sizeof(stateid_t));
 431         READ32(close->cl_seqid);
 432         READ32(close->cl_stateid.si_generation);
 433         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
 434
 435         DECODE_TAIL;
 436 }
 437
 438
 439 static int
 440 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 441 {
 442         DECODE_HEAD;
 443
 444         READ_BUF(12);
 445         READ64(commit->co_offset);
 446         READ32(commit->co_count);
 447
 448         DECODE_TAIL;
 449 }
 450
 451 static int
 452 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 453 {
 454         DECODE_HEAD;
 455
 456         READ_BUF(4);
 457         READ32(create->cr_type);
 458         switch (create->cr_type) {
 459         case NF4LNK:
 460                 READ_BUF(4);
 461                 READ32(create->cr_linklen);
 462                 READ_BUF(create->cr_linklen);
 463                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 464                 break;
 465         case NF4BLK:
 466         case NF4CHR:
 467                 READ_BUF(8);
 468                 READ32(create->cr_specdata1);
 469                 READ32(create->cr_specdata2);
 470                 break;
 471         case NF4SOCK:
 472         case NF4FIFO:
 473         case NF4DIR:
 474         default:
 475                 break;
 476         }
 477
 478         READ_BUF(4);
 479         READ32(create->cr_namelen);
 480         READ_BUF(create->cr_namelen);
 481         SAVEMEM(create->cr_name, create->cr_namelen);
 482         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 483                 return status;
 484
 485         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 486                 goto out;
 487
 488         DECODE_TAIL;
 489 }
 490
 491 static inline int
 492 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 493 {
 494         DECODE_HEAD;
 495
 496         READ_BUF(sizeof(stateid_t));
 497         READ32(dr->dr_stateid.si_generation);
 498         COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
 499
 500         DECODE_TAIL;
 501 }
 502
 503 static inline int
 504 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 505 {
 506         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 507 }
 508
 509 static int
 510 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 511 {
 512         DECODE_HEAD;
 513
 514         READ_BUF(4);
 515         READ32(link->li_namelen);
 516         READ_BUF(link->li_namelen);
 517         SAVEMEM(link->li_name, link->li_namelen);
 518         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 519                 return status;
 520
 521         DECODE_TAIL;
 522 }
 523
 524 static int
 525 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 526 {
 527         DECODE_HEAD;
 528
 529         lock->lk_replay_owner = NULL;
 530         /*
 531         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 532         */
 533         READ_BUF(28);
 534         READ32(lock->lk_type);
 535         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 536                 goto xdr_error;
 537         READ32(lock->lk_reclaim);
 538         READ64(lock->lk_offset);
 539         READ64(lock->lk_length);
 540         READ32(lock->lk_is_new);
 541
 542         if (lock->lk_is_new) {
 543                 READ_BUF(36);
 544                 READ32(lock->lk_new_open_seqid);
 545                 READ32(lock->lk_new_open_stateid.si_generation);
 546
 547                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
 548                 READ32(lock->lk_new_lock_seqid);
 549                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 550                 READ32(lock->lk_new_owner.len);
 551                 READ_BUF(lock->lk_new_owner.len);
 552                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 553         } else {
 554                 READ_BUF(20);
 555                 READ32(lock->lk_old_lock_stateid.si_generation);
 556                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
 557                 READ32(lock->lk_old_lock_seqid);
 558         }
 559
 560         DECODE_TAIL;
 561 }
 562
 563 static int
 564 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 565 {
 566         DECODE_HEAD;
 567
 568         READ_BUF(32);
 569         READ32(lockt->lt_type);
 570         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 571                 goto xdr_error;
 572         READ64(lockt->lt_offset);
 573         READ64(lockt->lt_length);
 574         COPYMEM(&lockt->lt_clientid, 8);
 575         READ32(lockt->lt_owner.len);
 576         READ_BUF(lockt->lt_owner.len);
 577         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 578
 579         DECODE_TAIL;
 580 }
 581
 582 static int
 583 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 584 {
 585         DECODE_HEAD;
 586
 587         locku->lu_stateowner = NULL;
 588         READ_BUF(24 + sizeof(stateid_t));
 589         READ32(locku->lu_type);
 590         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 591                 goto xdr_error;
 592         READ32(locku->lu_seqid);
 593         READ32(locku->lu_stateid.si_generation);
 594         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
 595         READ64(locku->lu_offset);
 596         READ64(locku->lu_length);
 597
 598         DECODE_TAIL;
 599 }
 600
 601 static int
 602 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 603 {
 604         DECODE_HEAD;
 605
 606         READ_BUF(4);
 607         READ32(lookup->lo_len);
 608         READ_BUF(lookup->lo_len);
 609         SAVEMEM(lookup->lo_name, lookup->lo_len);
 610         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 611                 return status;
 612
 613         DECODE_TAIL;
 614 }
 615
 616 static int
 617 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 618 {
 619         DECODE_HEAD;
 620
 621         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 622         open->op_iattr.ia_valid = 0;
 623         open->op_stateowner = NULL;
 624
 625         /* seqid, share_access, share_deny, clientid, ownerlen */
 626         READ_BUF(16 + sizeof(clientid_t));
 627         READ32(open->op_seqid);
 628         READ32(open->op_share_access);
 629         READ32(open->op_share_deny);
 630         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 631         READ32(open->op_owner.len);
 632
 633         /* owner, open_flag */
 634         READ_BUF(open->op_owner.len + 4);
 635         SAVEMEM(open->op_owner.data, open->op_owner.len);
 636         READ32(open->op_create);
 637         switch (open->op_create) {
 638         case NFS4_OPEN_NOCREATE:
 639                 break;
 640         case NFS4_OPEN_CREATE:
 641                 READ_BUF(4);
 642                 READ32(open->op_createmode);
 643                 switch (open->op_createmode) {
 644                 case NFS4_CREATE_UNCHECKED:
 645                 case NFS4_CREATE_GUARDED:
 646                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 647                                 goto out;
 648                         break;
 649                 case NFS4_CREATE_EXCLUSIVE:
 650                         READ_BUF(8);
 651                         COPYMEM(open->op_verf.data, 8);
 652                         break;
 653                 default:
 654                         goto xdr_error;
 655                 }
 656                 break;
 657         default:
 658                 goto xdr_error;
 659         }
 660
 661         /* open_claim */
 662         READ_BUF(4);
 663         READ32(open->op_claim_type);
 664         switch (open->op_claim_type) {
 665         case NFS4_OPEN_CLAIM_NULL:
 666         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 667                 READ_BUF(4);
 668                 READ32(open->op_fname.len);
 669                 READ_BUF(open->op_fname.len);
 670                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 671                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 672                         return status;
 673                 break;
 674         case NFS4_OPEN_CLAIM_PREVIOUS:
 675                 READ_BUF(4);
 676                 READ32(open->op_delegate_type);
 677                 break;
 678         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 679                 READ_BUF(sizeof(stateid_t) + 4);
 680                 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
 681                 READ32(open->op_fname.len);
 682                 READ_BUF(open->op_fname.len);
 683                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 684                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 685                         return status;
 686                 break;
 687         default:
 688                 goto xdr_error;
 689         }
 690
 691         DECODE_TAIL;
 692 }
 693
 694 static int
 695 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 696 {
 697         DECODE_HEAD;
 698
 699         open_conf->oc_stateowner = NULL;
 700         READ_BUF(4 + sizeof(stateid_t));
 701         READ32(open_conf->oc_req_stateid.si_generation);
 702         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
 703         READ32(open_conf->oc_seqid);
 704
 705         DECODE_TAIL;
 706 }
 707
 708 static int
 709 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 710 {
 711         DECODE_HEAD;
 712
 713         open_down->od_stateowner = NULL;
 714         READ_BUF(12 + sizeof(stateid_t));
 715         READ32(open_down->od_stateid.si_generation);
 716         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
 717         READ32(open_down->od_seqid);
 718         READ32(open_down->od_share_access);
 719         READ32(open_down->od_share_deny);
 720
 721         DECODE_TAIL;
 722 }
 723
 724 static int
 725 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 726 {
 727         DECODE_HEAD;
 728
 729         READ_BUF(4);
 730         READ32(putfh->pf_fhlen);
 731         if (putfh->pf_fhlen > NFS4_FHSIZE)
 732                 goto xdr_error;
 733         READ_BUF(putfh->pf_fhlen);
 734         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 735
 736         DECODE_TAIL;
 737 }
 738
 739 static int
 740 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 741 {
 742         DECODE_HEAD;
 743
 744         READ_BUF(sizeof(stateid_t) + 12);
 745         READ32(read->rd_stateid.si_generation);
 746         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
 747         READ64(read->rd_offset);
 748         READ32(read->rd_length);
 749
 750         DECODE_TAIL;
 751 }
 752
 753 static int
 754 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 755 {
 756         DECODE_HEAD;
 757
 758         READ_BUF(24);
 759         READ64(readdir->rd_cookie);
 760         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 761         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 762         READ32(readdir->rd_maxcount);
 763         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 764                 goto out;
 765
 766         DECODE_TAIL;
 767 }
 768
 769 static int
 770 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 771 {
 772         DECODE_HEAD;
 773
 774         READ_BUF(4);
 775         READ32(remove->rm_namelen);
 776         READ_BUF(remove->rm_namelen);
 777         SAVEMEM(remove->rm_name, remove->rm_namelen);
 778         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 779                 return status;
 780
 781         DECODE_TAIL;
 782 }
 783
 784 static int
 785 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 786 {
 787         DECODE_HEAD;
 788
 789         READ_BUF(4);
 790         READ32(rename->rn_snamelen);
 791         READ_BUF(rename->rn_snamelen + 4);
 792         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 793         READ32(rename->rn_tnamelen);
 794         READ_BUF(rename->rn_tnamelen);
 795         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 796         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 797                 return status;
 798         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 799                 return status;
 800
 801         DECODE_TAIL;
 802 }
 803
 804 static int
 805 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 806 {
 807         DECODE_HEAD;
 808
 809         READ_BUF(sizeof(clientid_t));
 810         COPYMEM(clientid, sizeof(clientid_t));
 811
 812         DECODE_TAIL;
 813 }
 814
 815 static int
 816 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 817 {
 818         DECODE_HEAD;
 819
 820         READ_BUF(sizeof(stateid_t));
 821         READ32(setattr->sa_stateid.si_generation);
 822         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 823         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 824                 goto out;
 825
 826         DECODE_TAIL;
 827 }
 828
 829 static int
 830 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 831 {
 832         DECODE_HEAD;
 833
 834         READ_BUF(12);
 835         COPYMEM(setclientid->se_verf.data, 8);
 836         READ32(setclientid->se_namelen);
 837
 838         READ_BUF(setclientid->se_namelen + 8);
 839         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 840         READ32(setclientid->se_callback_prog);
 841         READ32(setclientid->se_callback_netid_len);
 842
 843         READ_BUF(setclientid->se_callback_netid_len + 4);
 844         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 845         READ32(setclientid->se_callback_addr_len);
 846
 847         READ_BUF(setclientid->se_callback_addr_len + 4);
 848         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 849         READ32(setclientid->se_callback_ident);
 850
 851         DECODE_TAIL;
 852 }
 853
 854 static int
 855 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 856 {
 857         DECODE_HEAD;
 858
 859         READ_BUF(8 + sizeof(nfs4_verifier));
 860         COPYMEM(&scd_c->sc_clientid, 8);
 861         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 862
 863         DECODE_TAIL;
 864 }
 865
 866 /* Also used for NVERIFY */
 867 static int
 868 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 869 {
 870 #if 0
 871         struct nfsd4_compoundargs save = {
 872                 .p = argp->p,
 873                 .end = argp->end,
 874                 .rqstp = argp->rqstp,
 875         };
 876         u32             ve_bmval[2];
 877         struct iattr    ve_iattr;           /* request */
 878         struct nfs4_acl *ve_acl;            /* request */
 879 #endif
 880         DECODE_HEAD;
 881
 882         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 883                 goto out;
 884
 885         /* For convenience's sake, we compare raw xdr'd attributes in
 886          * nfsd4_proc_verify; however we still decode here just to return
 887          * correct error in case of bad xdr. */
 888 #if 0
 889         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 890         if (status == nfserr_inval) {
 891                 status = nfserrno(status);
 892                 goto out;
 893         }
 894 #endif
 895         READ_BUF(4);
 896         READ32(verify->ve_attrlen);
 897         READ_BUF(verify->ve_attrlen);
 898         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 899
 900         DECODE_TAIL;
 901 }
 902
 903 static int
 904 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 905 {
 906         int avail;
 907         int v;
 908         int len;
 909         DECODE_HEAD;
 910
 911         READ_BUF(sizeof(stateid_opaque_t) + 20);
 912         READ32(write->wr_stateid.si_generation);
 913         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
 914         READ64(write->wr_offset);
 915         READ32(write->wr_stable_how);
 916         if (write->wr_stable_how > 2)
 917                 goto xdr_error;
 918         READ32(write->wr_buflen);
 919
 920         /* Sorry .. no magic macros for this.. *
 921          * READ_BUF(write->wr_buflen);
 922          * SAVEMEM(write->wr_buf, write->wr_buflen);
 923          */
 924         avail = (char*)argp->end - (char*)argp->p;
 925         if (avail + argp->pagelen < write->wr_buflen) {
 926                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__);
 927                 goto xdr_error;
 928         }
 929         write->wr_vec[0].iov_base = p;
 930         write->wr_vec[0].iov_len = avail;
 931         v = 0;
 932         len = write->wr_buflen;
 933         while (len > write->wr_vec[v].iov_len) {
 934                 len -= write->wr_vec[v].iov_len;
 935                 v++;
 936                 write->wr_vec[v].iov_base = page_address(argp->pagelist[0]);
 937                 argp->pagelist++;
 938                 if (argp->pagelen >= PAGE_SIZE) {
 939                         write->wr_vec[v].iov_len = PAGE_SIZE;
 940                         argp->pagelen -= PAGE_SIZE;
 941                 } else {
 942                         write->wr_vec[v].iov_len = argp->pagelen;
 943                         argp->pagelen -= len;
 944                 }
 945         }
 946         argp->end = (u32*) (write->wr_vec[v].iov_base + write->wr_vec[v].iov_len);
 947         argp->p = (u32*)  (write->wr_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 948         write->wr_vec[v].iov_len = len;
 949         write->wr_vlen = v+1;
 950
 951         DECODE_TAIL;
 952 }
 953
 954 static int
 955 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 956 {
 957         DECODE_HEAD;
 958
 959         READ_BUF(12);
 960         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 961         READ32(rlockowner->rl_owner.len);
 962         READ_BUF(rlockowner->rl_owner.len);
 963         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 964
 965         DECODE_TAIL;
 966 }
 967
 968 static int
 969 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 970 {
 971         DECODE_HEAD;
 972         struct nfsd4_op *op;
 973         int i;
 974
 975         /*
 976          * XXX: According to spec, we should check the tag
 977          * for UTF-8 compliance.  I'm postponing this for
 978          * now because it seems that some clients do use
 979          * binary tags.
 980          */
 981         READ_BUF(4);
 982         READ32(argp->taglen);
 983         READ_BUF(argp->taglen + 8);
 984         SAVEMEM(argp->tag, argp->taglen);
 985         READ32(argp->minorversion);
 986         READ32(argp->opcnt);
 987
 988         if (argp->taglen > NFSD4_MAX_TAGLEN)
 989                 goto xdr_error;
 990         if (argp->opcnt > 100)
 991                 goto xdr_error;
 992
 993         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
 994                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
 995                 if (!argp->ops) {
 996                         argp->ops = argp->iops;
 997                         printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
 998                         goto xdr_error;
 999                 }
1000         }
1001
1002         for (i = 0; i < argp->opcnt; i++) {
1003                 op = &argp->ops[i];
1004                 op->replay = NULL;
1005
1006                 /*
1007                  * We can't use READ_BUF() here because we need to handle
1008                  * a missing opcode as an OP_WRITE + 1. So we need to check
1009                  * to see if we're truly at the end of our buffer or if there
1010                  * is another page we need to flip to.
1011                  */
1012
1013                 if (argp->p == argp->end) {
1014                         if (argp->pagelen < 4) {
1015                                 /* There isn't an opcode still on the wire */
1016                                 op->opnum = OP_WRITE + 1;
1017                                 op->status = nfserr_bad_xdr;
1018                                 argp->opcnt = i+1;
1019                                 break;
1020                         }
1021
1022                         /*
1023                          * False alarm. We just hit a page boundary, but there
1024                          * is still data available.  Move pointer across page
1025                          * boundary.  *snip from READ_BUF*
1026                          */
1027                         argp->p = page_address(argp->pagelist[0]);
1028                         argp->pagelist++;
1029                         if (argp->pagelen < PAGE_SIZE) {
1030                                 argp->end = p + (argp->pagelen>>2);
1031                                 argp->pagelen = 0;
1032                         } else {
1033                                 argp->end = p + (PAGE_SIZE>>2);
1034                                 argp->pagelen -= PAGE_SIZE;
1035                         }
1036                 }
1037                 op->opnum = ntohl(*argp->p++);
1038
1039                 switch (op->opnum) {
1040                 case 2: /* Reserved operation */
1041                         op->opnum = OP_ILLEGAL;
1042                         if (argp->minorversion == 0)
1043                                 op->status = nfserr_op_illegal;
1044                         else
1045                                 op->status = nfserr_minor_vers_mismatch;
1046                         break;
1047                 case OP_ACCESS:
1048                         op->status = nfsd4_decode_access(argp, &op->u.access);
1049                         break;
1050                 case OP_CLOSE:
1051                         op->status = nfsd4_decode_close(argp, &op->u.close);
1052                         break;
1053                 case OP_COMMIT:
1054                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1055                         break;
1056                 case OP_CREATE:
1057                         op->status = nfsd4_decode_create(argp, &op->u.create);
1058                         break;
1059                 case OP_DELEGRETURN:
1060                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1061                         break;
1062                 case OP_GETATTR:
1063                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1064                         break;
1065                 case OP_GETFH:
1066                         op->status = nfs_ok;
1067                         break;
1068                 case OP_LINK:
1069                         op->status = nfsd4_decode_link(argp, &op->u.link);
1070                         break;
1071                 case OP_LOCK:
1072                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1073                         break;
1074                 case OP_LOCKT:
1075                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1076                         break;
1077                 case OP_LOCKU:
1078                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1079                         break;
1080                 case OP_LOOKUP:
1081                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1082                         break;
1083                 case OP_LOOKUPP:
1084                         op->status = nfs_ok;
1085                         break;
1086                 case OP_NVERIFY:
1087                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1088                         break;
1089                 case OP_OPEN:
1090                         op->status = nfsd4_decode_open(argp, &op->u.open);
1091                         break;
1092                 case OP_OPEN_CONFIRM:
1093                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1094                         break;
1095                 case OP_OPEN_DOWNGRADE:
1096                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1097                         break;
1098                 case OP_PUTFH:
1099                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1100                         break;
1101                 case OP_PUTROOTFH:
1102                         op->status = nfs_ok;
1103                         break;
1104                 case OP_READ:
1105                         op->status = nfsd4_decode_read(argp, &op->u.read);
1106                         break;
1107                 case OP_READDIR:
1108                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1109                         break;
1110                 case OP_READLINK:
1111                         op->status = nfs_ok;
1112                         break;
1113                 case OP_REMOVE:
1114                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1115                         break;
1116                 case OP_RENAME:
1117                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1118                         break;
1119                 case OP_RESTOREFH:
1120                         op->status = nfs_ok;
1121                         break;
1122                 case OP_RENEW:
1123                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1124                         break;
1125                 case OP_SAVEFH:
1126                         op->status = nfs_ok;
1127                         break;
1128                 case OP_SETATTR:
1129                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1130                         break;
1131                 case OP_SETCLIENTID:
1132                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1133                         break;
1134                 case OP_SETCLIENTID_CONFIRM:
1135                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1136                         break;
1137                 case OP_VERIFY:
1138                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1139                         break;
1140                 case OP_WRITE:
1141                         op->status = nfsd4_decode_write(argp, &op->u.write);
1142                         break;
1143                 case OP_RELEASE_LOCKOWNER:
1144                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1145                         break;
1146                 default:
1147                         op->opnum = OP_ILLEGAL;
1148                         op->status = nfserr_op_illegal;
1149                         break;
1150                 }
1151
1152                 if (op->status) {
1153                         argp->opcnt = i+1;
1154                         break;
1155                 }
1156         }
1157
1158         DECODE_TAIL;
1159 }
1160 /*
1161  * END OF "GENERIC" DECODE ROUTINES.
1162  */
1163
1164 /*
1165  * START OF "GENERIC" ENCODE ROUTINES.
1166  *   These may look a little ugly since they are imported from a "generic"
1167  * set of XDR encode/decode routines which are intended to be shared by
1168  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1169  *
1170  * If the pain of reading these is too great, it should be a straightforward
1171  * task to translate them into Linux-specific versions which are more
1172  * consistent with the style used in NFSv2/v3...
1173  */
1174 #define ENCODE_HEAD              u32 *p
1175
1176 #define WRITE32(n)               *p++ = htonl(n)
1177 #define WRITE64(n)               do {                           \
1178         *p++ = htonl((u32)((n) >> 32));                         \
1179         *p++ = htonl((u32)(n));                                 \
1180 } while (0)
1181 #define WRITEMEM(ptr,nbytes)     do {                           \
1182         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1183         memcpy(p, ptr, nbytes);                                 \
1184         p += XDR_QUADLEN(nbytes);                               \
1185 } while (0)
1186 #define WRITECINFO(c)           do {                            \
1187         *p++ = htonl(c.atomic);                                 \
1188         *p++ = htonl(c.before_ctime_sec);                               \
1189         *p++ = htonl(c.before_ctime_nsec);                              \
1190         *p++ = htonl(c.after_ctime_sec);                                \
1191         *p++ = htonl(c.after_ctime_nsec);                               \
1192 } while (0)
1193
1194 #define RESERVE_SPACE(nbytes)   do {                            \
1195         p = resp->p;                                            \
1196         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1197 } while (0)
1198 #define ADJUST_ARGS()           resp->p = p
1199
1200 /*
1201  * Header routine to setup seqid operation replay cache
1202  */
1203 #define ENCODE_SEQID_OP_HEAD                                    \
1204         u32 *p;                                                 \
1205         u32 *save;                                              \
1206                                                                 \
1207         save = resp->p;
1208
1209 /*
1210  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1211  * is where sequence id's are incremented, and the replay cache is filled.
1212  * Note that we increment sequence id's here, at the last moment, so we're sure
1213  * we know whether the error to be returned is a sequence id mutating error.
1214  */
1215
1216 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1217         if (seqid_mutating_err(nfserr) && stateowner) {         \
1218                 stateowner->so_seqid++;                         \
1219                 stateowner->so_replay.rp_status = nfserr;       \
1220                 stateowner->so_replay.rp_buflen =               \
1221                           (((char *)(resp)->p - (char *)save)); \
1222                 memcpy(stateowner->so_replay.rp_buf, save,      \
1223                         stateowner->so_replay.rp_buflen);       \
1224         } } while (0);
1225
1226
1227 static u32 nfs4_ftypes[16] = {
1228         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1229         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1230         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1231         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1232 };
1233
1234 static int
1235 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1236                         u32 **p, int *buflen)
1237 {
1238         int status;
1239
1240         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1241                 return nfserr_resource;
1242         if (whotype != NFS4_ACL_WHO_NAMED)
1243                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1244         else if (group)
1245                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1246         else
1247                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1248         if (status < 0)
1249                 return nfserrno(status);
1250         *p = xdr_encode_opaque(*p, NULL, status);
1251         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1252         BUG_ON(*buflen < 0);
1253         return 0;
1254 }
1255
1256 static inline int
1257 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, u32 **p, int *buflen)
1258 {
1259         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1260 }
1261
1262 static inline int
1263 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, u32 **p, int *buflen)
1264 {
1265         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1266 }
1267
1268 static inline int
1269 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1270                 u32 **p, int *buflen)
1271 {
1272         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1273 }
1274
1275
1276 /*
1277  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1278  * ourselves.
1279  *
1280  * @countp is the buffer size in _words_; upon successful return this becomes
1281  * replaced with the number of words written.
1282  */
1283 int
1284 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1285                 struct dentry *dentry, u32 *buffer, int *countp, u32 *bmval,
1286                 struct svc_rqst *rqstp)
1287 {
1288         u32 bmval0 = bmval[0];
1289         u32 bmval1 = bmval[1];
1290         struct kstat stat;
1291         struct svc_fh tempfh;
1292         struct kstatfs statfs;
1293         int buflen = *countp << 2;
1294         u32 *attrlenp;
1295         u32 dummy;
1296         u64 dummy64;
1297         u32 *p = buffer;
1298         int status;
1299         int aclsupport = 0;
1300         struct nfs4_acl *acl = NULL;
1301
1302         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1303         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1304         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1305
1306         status = vfs_getattr(exp->ex_mnt, dentry, &stat);
1307         if (status)
1308                 goto out_nfserr;
1309         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1310             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1311                        FATTR4_WORD1_SPACE_TOTAL))) {
1312                 status = vfs_statfs(dentry, &statfs);
1313                 if (status)
1314                         goto out_nfserr;
1315         }
1316         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1317                 fh_init(&tempfh, NFS4_FHSIZE);
1318                 status = fh_compose(&tempfh, exp, dentry, NULL);
1319                 if (status)
1320                         goto out;
1321                 fhp = &tempfh;
1322         }
1323         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1324                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1325                 status = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1326                 aclsupport = (status == 0);
1327                 if (bmval0 & FATTR4_WORD0_ACL) {
1328                         if (status == -EOPNOTSUPP)
1329                                 bmval0 &= ~FATTR4_WORD0_ACL;
1330                         else if (status == -EINVAL) {
1331                                 status = nfserr_attrnotsupp;
1332                                 goto out;
1333                         } else if (status != 0)
1334                                 goto out_nfserr;
1335                 }
1336         }
1337         if ((buflen -= 16) < 0)
1338                 goto out_resource;
1339
1340         WRITE32(2);
1341         WRITE32(bmval0);
1342         WRITE32(bmval1);
1343         attrlenp = p++;                /* to be backfilled later */
1344
1345         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1346                 if ((buflen -= 12) < 0)
1347                         goto out_resource;
1348                 WRITE32(2);
1349                 WRITE32(aclsupport ?
1350                         NFSD_SUPPORTED_ATTRS_WORD0 :
1351                         NFSD_SUPPORTED_ATTRS_WORD0 & ~FATTR4_WORD0_ACL);
1352                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1353         }
1354         if (bmval0 & FATTR4_WORD0_TYPE) {
1355                 if ((buflen -= 4) < 0)
1356                         goto out_resource;
1357                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1358                 if (dummy == NF4BAD)
1359                         goto out_serverfault;
1360                 WRITE32(dummy);
1361         }
1362         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1363                 if ((buflen -= 4) < 0)
1364                         goto out_resource;
1365                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1366                         WRITE32(NFS4_FH_PERSISTENT);
1367                 else
1368                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1369         }
1370         if (bmval0 & FATTR4_WORD0_CHANGE) {
1371                 /*
1372                  * Note: This _must_ be consistent with the scheme for writing
1373                  * change_info, so any changes made here must be reflected there
1374                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1375                  * macro above.)
1376                  */
1377                 if ((buflen -= 8) < 0)
1378                         goto out_resource;
1379                 WRITE32(stat.ctime.tv_sec);
1380                 WRITE32(stat.ctime.tv_nsec);
1381         }
1382         if (bmval0 & FATTR4_WORD0_SIZE) {
1383                 if ((buflen -= 8) < 0)
1384                         goto out_resource;
1385                 WRITE64(stat.size);
1386         }
1387         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1388                 if ((buflen -= 4) < 0)
1389                         goto out_resource;
1390                 WRITE32(1);
1391         }
1392         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1393                 if ((buflen -= 4) < 0)
1394                         goto out_resource;
1395                 WRITE32(1);
1396         }
1397         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1398                 if ((buflen -= 4) < 0)
1399                         goto out_resource;
1400                 WRITE32(0);
1401         }
1402         if (bmval0 & FATTR4_WORD0_FSID) {
1403                 if ((buflen -= 16) < 0)
1404                         goto out_resource;
1405                 if (is_fsid(fhp, rqstp->rq_reffh)) {
1406                         WRITE64((u64)exp->ex_fsid);
1407                         WRITE64((u64)0);
1408                 } else {
1409                         WRITE32(0);
1410                         WRITE32(MAJOR(stat.dev));
1411                         WRITE32(0);
1412                         WRITE32(MINOR(stat.dev));
1413                 }
1414         }
1415         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1416                 if ((buflen -= 4) < 0)
1417                         goto out_resource;
1418                 WRITE32(0);
1419         }
1420         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1421                 if ((buflen -= 4) < 0)
1422                         goto out_resource;
1423                 WRITE32(NFSD_LEASE_TIME);
1424         }
1425         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1426                 if ((buflen -= 4) < 0)
1427                         goto out_resource;
1428                 WRITE32(0);
1429         }
1430         if (bmval0 & FATTR4_WORD0_ACL) {
1431                 struct nfs4_ace *ace;
1432                 struct list_head *h;
1433
1434                 if (acl == NULL) {
1435                         if ((buflen -= 4) < 0)
1436                                 goto out_resource;
1437
1438                         WRITE32(0);
1439                         goto out_acl;
1440                 }
1441                 if ((buflen -= 4) < 0)
1442                         goto out_resource;
1443                 WRITE32(acl->naces);
1444
1445                 list_for_each(h, &acl->ace_head) {
1446                         ace = list_entry(h, struct nfs4_ace, l_ace);
1447
1448                         if ((buflen -= 4*3) < 0)
1449                                 goto out_resource;
1450                         WRITE32(ace->type);
1451                         WRITE32(ace->flag);
1452                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1453                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1454                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1455                                 &p, &buflen);
1456                         if (status == nfserr_resource)
1457                                 goto out_resource;
1458                         if (status)
1459                                 goto out;
1460                 }
1461         }
1462 out_acl:
1463         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1464                 if ((buflen -= 4) < 0)
1465                         goto out_resource;
1466                 WRITE32(aclsupport ?
1467                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1468         }
1469         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1470                 if ((buflen -= 4) < 0)
1471                         goto out_resource;
1472                 WRITE32(1);
1473         }
1474         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1475                 if ((buflen -= 4) < 0)
1476                         goto out_resource;
1477                 WRITE32(1);
1478         }
1479         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1480                 if ((buflen -= 4) < 0)
1481                         goto out_resource;
1482                 WRITE32(1);
1483         }
1484         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1485                 if ((buflen -= 4) < 0)
1486                         goto out_resource;
1487                 WRITE32(1);
1488         }
1489         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1490                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1491                 if (buflen < 0)
1492                         goto out_resource;
1493                 WRITE32(fhp->fh_handle.fh_size);
1494                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1495         }
1496         if (bmval0 & FATTR4_WORD0_FILEID) {
1497                 if ((buflen -= 8) < 0)
1498                         goto out_resource;
1499                 WRITE64((u64) stat.ino);
1500         }
1501         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1502                 if ((buflen -= 8) < 0)
1503                         goto out_resource;
1504                 WRITE64((u64) statfs.f_ffree);
1505         }
1506         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1507                 if ((buflen -= 8) < 0)
1508                         goto out_resource;
1509                 WRITE64((u64) statfs.f_ffree);
1510         }
1511         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1512                 if ((buflen -= 8) < 0)
1513                         goto out_resource;
1514                 WRITE64((u64) statfs.f_files);
1515         }
1516         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1517                 if ((buflen -= 4) < 0)
1518                         goto out_resource;
1519                 WRITE32(1);
1520         }
1521         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1522                 if ((buflen -= 8) < 0)
1523                         goto out_resource;
1524                 WRITE64(~(u64)0);
1525         }
1526         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1527                 if ((buflen -= 4) < 0)
1528                         goto out_resource;
1529                 WRITE32(255);
1530         }
1531         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1532                 if ((buflen -= 4) < 0)
1533                         goto out_resource;
1534                 WRITE32(~(u32) 0);
1535         }
1536         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1537                 if ((buflen -= 8) < 0)
1538                         goto out_resource;
1539                 WRITE64((u64) NFSSVC_MAXBLKSIZE);
1540         }
1541         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1542                 if ((buflen -= 8) < 0)
1543                         goto out_resource;
1544                 WRITE64((u64) NFSSVC_MAXBLKSIZE);
1545         }
1546         if (bmval1 & FATTR4_WORD1_MODE) {
1547                 if ((buflen -= 4) < 0)
1548                         goto out_resource;
1549                 WRITE32(stat.mode & S_IALLUGO);
1550         }
1551         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1552                 if ((buflen -= 4) < 0)
1553                         goto out_resource;
1554                 WRITE32(1);
1555         }
1556         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1557                 if ((buflen -= 4) < 0)
1558                         goto out_resource;
1559                 WRITE32(stat.nlink);
1560         }
1561         if (bmval1 & FATTR4_WORD1_OWNER) {
1562                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1563                 if (status == nfserr_resource)
1564                         goto out_resource;
1565                 if (status)
1566                         goto out;
1567         }
1568         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1569                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1570                 if (status == nfserr_resource)
1571                         goto out_resource;
1572                 if (status)
1573                         goto out;
1574         }
1575         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1576                 if ((buflen -= 8) < 0)
1577                         goto out_resource;
1578                 WRITE32((u32) MAJOR(stat.rdev));
1579                 WRITE32((u32) MINOR(stat.rdev));
1580         }
1581         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1582                 if ((buflen -= 8) < 0)
1583                         goto out_resource;
1584                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1585                 WRITE64(dummy64);
1586         }
1587         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1588                 if ((buflen -= 8) < 0)
1589                         goto out_resource;
1590                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1591                 WRITE64(dummy64);
1592         }
1593         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1594                 if ((buflen -= 8) < 0)
1595                         goto out_resource;
1596                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1597                 WRITE64(dummy64);
1598         }
1599         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1600                 if ((buflen -= 8) < 0)
1601                         goto out_resource;
1602                 dummy64 = (u64)stat.blocks << 9;
1603                 WRITE64(dummy64);
1604         }
1605         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1606                 if ((buflen -= 12) < 0)
1607                         goto out_resource;
1608                 WRITE32(0);
1609                 WRITE32(stat.atime.tv_sec);
1610                 WRITE32(stat.atime.tv_nsec);
1611         }
1612         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1613                 if ((buflen -= 12) < 0)
1614                         goto out_resource;
1615                 WRITE32(0);
1616                 WRITE32(1);
1617                 WRITE32(0);
1618         }
1619         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1620                 if ((buflen -= 12) < 0)
1621                         goto out_resource;
1622                 WRITE32(0);
1623                 WRITE32(stat.ctime.tv_sec);
1624                 WRITE32(stat.ctime.tv_nsec);
1625         }
1626         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1627                 if ((buflen -= 12) < 0)
1628                         goto out_resource;
1629                 WRITE32(0);
1630                 WRITE32(stat.mtime.tv_sec);
1631                 WRITE32(stat.mtime.tv_nsec);
1632         }
1633         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1634                 struct dentry *mnt_pnt, *mnt_root;
1635
1636                 if ((buflen -= 8) < 0)
1637                         goto out_resource;
1638                 mnt_root = exp->ex_mnt->mnt_root;
1639                 if (mnt_root->d_inode == dentry->d_inode) {
1640                         mnt_pnt = exp->ex_mnt->mnt_mountpoint;
1641                         WRITE64((u64) mnt_pnt->d_inode->i_ino);
1642                 } else
1643                         WRITE64((u64) stat.ino);
1644         }
1645         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1646         *countp = p - buffer;
1647         status = nfs_ok;
1648
1649 out:
1650         nfs4_acl_free(acl);
1651         if (fhp == &tempfh)
1652                 fh_put(&tempfh);
1653         return status;
1654 out_nfserr:
1655         status = nfserrno(status);
1656         goto out;
1657 out_resource:
1658         *countp = 0;
1659         status = nfserr_resource;
1660         goto out;
1661 out_serverfault:
1662         status = nfserr_serverfault;
1663         goto out;
1664 }
1665
1666 static int
1667 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1668                 const char *name, int namlen, u32 *p, int *buflen)
1669 {
1670         struct svc_export *exp = cd->rd_fhp->fh_export;
1671         struct dentry *dentry;
1672         int nfserr;
1673
1674         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1675         if (IS_ERR(dentry))
1676                 return nfserrno(PTR_ERR(dentry));
1677
1678         exp_get(exp);
1679         if (d_mountpoint(dentry)) {
1680                 if (nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp)) {
1681                 /*
1682                  * -EAGAIN is the only error returned from
1683                  * nfsd_cross_mnt() and it indicates that an
1684                  * up-call has  been initiated to fill in the export
1685                  * options on exp.  When the answer comes back,
1686                  * this call will be retried.
1687                  */
1688                         nfserr = nfserr_dropit;
1689                         goto out_put;
1690                 }
1691
1692         }
1693         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1694                                         cd->rd_rqstp);
1695 out_put:
1696         dput(dentry);
1697         exp_put(exp);
1698         return nfserr;
1699 }
1700
1701 static u32 *
1702 nfsd4_encode_rdattr_error(u32 *p, int buflen, int nfserr)
1703 {
1704         u32 *attrlenp;
1705
1706         if (buflen < 6)
1707                 return NULL;
1708         *p++ = htonl(2);
1709         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1710         *p++ = htonl(0);                         /* bmval1 */
1711
1712         attrlenp = p++;
1713         *p++ = nfserr;       /* no htonl */
1714         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1715         return p;
1716 }
1717
1718 static int
1719 nfsd4_encode_dirent(struct readdir_cd *ccd, const char *name, int namlen,
1720                     loff_t offset, ino_t ino, unsigned int d_type)
1721 {
1722         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1723         int buflen;
1724         u32 *p = cd->buffer;
1725         int nfserr = nfserr_toosmall;
1726
1727         /* In nfsv4, "." and ".." never make it onto the wire.. */
1728         if (name && isdotent(name, namlen)) {
1729                 cd->common.err = nfs_ok;
1730                 return 0;
1731         }
1732
1733         if (cd->offset)
1734                 xdr_encode_hyper(cd->offset, (u64) offset);
1735
1736         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1737         if (buflen < 0)
1738                 goto fail;
1739
1740         *p++ = xdr_one;                             /* mark entry present */
1741         cd->offset = p;                             /* remember pointer */
1742         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1743         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1744
1745         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1746         switch (nfserr) {
1747         case nfs_ok:
1748                 p += buflen;
1749                 break;
1750         case nfserr_resource:
1751                 nfserr = nfserr_toosmall;
1752                 goto fail;
1753         case nfserr_dropit:
1754                 goto fail;
1755         default:
1756                 /*
1757                  * If the client requested the RDATTR_ERROR attribute,
1758                  * we stuff the error code into this attribute
1759                  * and continue.  If this attribute was not requested,
1760                  * then in accordance with the spec, we fail the
1761                  * entire READDIR operation(!)
1762                  */
1763                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1764                         goto fail;
1765                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1766                 if (p == NULL) {
1767                         nfserr = nfserr_toosmall;
1768                         goto fail;
1769                 }
1770         }
1771         cd->buflen -= (p - cd->buffer);
1772         cd->buffer = p;
1773         cd->common.err = nfs_ok;
1774         return 0;
1775 fail:
1776         cd->common.err = nfserr;
1777         return -EINVAL;
1778 }
1779
1780 static void
1781 nfsd4_encode_access(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_access *access)
1782 {
1783         ENCODE_HEAD;
1784
1785         if (!nfserr) {
1786                 RESERVE_SPACE(8);
1787                 WRITE32(access->ac_supported);
1788                 WRITE32(access->ac_resp_access);
1789                 ADJUST_ARGS();
1790         }
1791 }
1792
1793 static void
1794 nfsd4_encode_close(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_close *close)
1795 {
1796         ENCODE_SEQID_OP_HEAD;
1797
1798         if (!nfserr) {
1799                 RESERVE_SPACE(sizeof(stateid_t));
1800                 WRITE32(close->cl_stateid.si_generation);
1801                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1802                 ADJUST_ARGS();
1803         }
1804         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1805 }
1806
1807
1808 static void
1809 nfsd4_encode_commit(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_commit *commit)
1810 {
1811         ENCODE_HEAD;
1812
1813         if (!nfserr) {
1814                 RESERVE_SPACE(8);
1815                 WRITEMEM(commit->co_verf.data, 8);
1816                 ADJUST_ARGS();
1817         }
1818 }
1819
1820 static void
1821 nfsd4_encode_create(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_create *create)
1822 {
1823         ENCODE_HEAD;
1824
1825         if (!nfserr) {
1826                 RESERVE_SPACE(32);
1827                 WRITECINFO(create->cr_cinfo);
1828                 WRITE32(2);
1829                 WRITE32(create->cr_bmval[0]);
1830                 WRITE32(create->cr_bmval[1]);
1831                 ADJUST_ARGS();
1832         }
1833 }
1834
1835 static int
1836 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_getattr *getattr)
1837 {
1838         struct svc_fh *fhp = getattr->ga_fhp;
1839         int buflen;
1840
1841         if (nfserr)
1842                 return nfserr;
1843
1844         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
1845         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
1846                                     resp->p, &buflen, getattr->ga_bmval,
1847                                     resp->rqstp);
1848
1849         if (!nfserr)
1850                 resp->p += buflen;
1851         return nfserr;
1852 }
1853
1854 static void
1855 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, int nfserr, struct svc_fh *fhp)
1856 {
1857         unsigned int len;
1858         ENCODE_HEAD;
1859
1860         if (!nfserr) {
1861                 len = fhp->fh_handle.fh_size;
1862                 RESERVE_SPACE(len + 4);
1863                 WRITE32(len);
1864                 WRITEMEM(&fhp->fh_handle.fh_base, len);
1865                 ADJUST_ARGS();
1866         }
1867 }
1868
1869 /*
1870 * Including all fields other than the name, a LOCK4denied structure requires
1871 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
1872 */
1873 static void
1874 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
1875 {
1876         ENCODE_HEAD;
1877
1878         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
1879         WRITE64(ld->ld_start);
1880         WRITE64(ld->ld_length);
1881         WRITE32(ld->ld_type);
1882         if (ld->ld_sop) {
1883                 WRITEMEM(&ld->ld_clientid, 8);
1884                 WRITE32(ld->ld_sop->so_owner.len);
1885                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
1886                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
1887         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
1888                 WRITE64((u64)0); /* clientid */
1889                 WRITE32(0); /* length of owner name */
1890         }
1891         ADJUST_ARGS();
1892 }
1893
1894 static void
1895 nfsd4_encode_lock(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lock *lock)
1896 {
1897         ENCODE_SEQID_OP_HEAD;
1898
1899         if (!nfserr) {
1900                 RESERVE_SPACE(4 + sizeof(stateid_t));
1901                 WRITE32(lock->lk_resp_stateid.si_generation);
1902                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
1903                 ADJUST_ARGS();
1904         } else if (nfserr == nfserr_denied)
1905                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
1906
1907         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
1908 }
1909
1910 static void
1911 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lockt *lockt)
1912 {
1913         if (nfserr == nfserr_denied)
1914                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
1915 }
1916
1917 static void
1918 nfsd4_encode_locku(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_locku *locku)
1919 {
1920         ENCODE_SEQID_OP_HEAD;
1921
1922         if (!nfserr) {
1923                 RESERVE_SPACE(sizeof(stateid_t));
1924                 WRITE32(locku->lu_stateid.si_generation);
1925                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
1926                 ADJUST_ARGS();
1927         }
1928
1929         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
1930 }
1931
1932
1933 static void
1934 nfsd4_encode_link(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_link *link)
1935 {
1936         ENCODE_HEAD;
1937
1938         if (!nfserr) {
1939                 RESERVE_SPACE(20);
1940                 WRITECINFO(link->li_cinfo);
1941                 ADJUST_ARGS();
1942         }
1943 }
1944
1945
1946 static void
1947 nfsd4_encode_open(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open *open)
1948 {
1949         ENCODE_SEQID_OP_HEAD;
1950
1951         if (nfserr)
1952                 goto out;
1953
1954         RESERVE_SPACE(36 + sizeof(stateid_t));
1955         WRITE32(open->op_stateid.si_generation);
1956         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
1957         WRITECINFO(open->op_cinfo);
1958         WRITE32(open->op_rflags);
1959         WRITE32(2);
1960         WRITE32(open->op_bmval[0]);
1961         WRITE32(open->op_bmval[1]);
1962         WRITE32(open->op_delegate_type);
1963         ADJUST_ARGS();
1964
1965         switch (open->op_delegate_type) {
1966         case NFS4_OPEN_DELEGATE_NONE:
1967                 break;
1968         case NFS4_OPEN_DELEGATE_READ:
1969                 RESERVE_SPACE(20 + sizeof(stateid_t));
1970                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
1971                 WRITE32(open->op_recall);
1972
1973                 /*
1974                  * TODO: ACE's in delegations
1975                  */
1976                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
1977                 WRITE32(0);
1978                 WRITE32(0);
1979                 WRITE32(0);   /* XXX: is NULL principal ok? */
1980                 ADJUST_ARGS();
1981                 break;
1982         case NFS4_OPEN_DELEGATE_WRITE:
1983                 RESERVE_SPACE(32 + sizeof(stateid_t));
1984                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
1985                 WRITE32(0);
1986
1987                 /*
1988                  * TODO: space_limit's in delegations
1989                  */
1990                 WRITE32(NFS4_LIMIT_SIZE);
1991                 WRITE32(~(u32)0);
1992                 WRITE32(~(u32)0);
1993
1994                 /*
1995                  * TODO: ACE's in delegations
1996                  */
1997                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
1998                 WRITE32(0);
1999                 WRITE32(0);
2000                 WRITE32(0);   /* XXX: is NULL principal ok? */
2001                 ADJUST_ARGS();
2002                 break;
2003         default:
2004                 BUG();
2005         }
2006         /* XXX save filehandle here */
2007 out:
2008         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2009 }
2010
2011 static void
2012 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_confirm *oc)
2013 {
2014         ENCODE_SEQID_OP_HEAD;
2015
2016         if (!nfserr) {
2017                 RESERVE_SPACE(sizeof(stateid_t));
2018                 WRITE32(oc->oc_resp_stateid.si_generation);
2019                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2020                 ADJUST_ARGS();
2021         }
2022
2023         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2024 }
2025
2026 static void
2027 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_downgrade *od)
2028 {
2029         ENCODE_SEQID_OP_HEAD;
2030
2031         if (!nfserr) {
2032                 RESERVE_SPACE(sizeof(stateid_t));
2033                 WRITE32(od->od_stateid.si_generation);
2034                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2035                 ADJUST_ARGS();
2036         }
2037
2038         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2039 }
2040
2041 static int
2042 nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_read *read)
2043 {
2044         u32 eof;
2045         int v, pn;
2046         unsigned long maxcount;
2047         long len;
2048         ENCODE_HEAD;
2049
2050         if (nfserr)
2051                 return nfserr;
2052         if (resp->xbuf->page_len)
2053                 return nfserr_resource;
2054
2055         RESERVE_SPACE(8); /* eof flag and byte count */
2056
2057         maxcount = NFSSVC_MAXBLKSIZE;
2058         if (maxcount > read->rd_length)
2059                 maxcount = read->rd_length;
2060
2061         len = maxcount;
2062         v = 0;
2063         while (len > 0) {
2064                 pn = resp->rqstp->rq_resused;
2065                 svc_take_page(resp->rqstp);
2066                 read->rd_iov[v].iov_base = page_address(resp->rqstp->rq_respages[pn]);
2067                 read->rd_iov[v].iov_len = len < PAGE_SIZE ? len : PAGE_SIZE;
2068                 v++;
2069                 len -= PAGE_SIZE;
2070         }
2071         read->rd_vlen = v;
2072
2073         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2074                         read->rd_offset, read->rd_iov, read->rd_vlen,
2075                         &maxcount);
2076
2077         if (nfserr == nfserr_symlink)
2078                 nfserr = nfserr_inval;
2079         if (nfserr)
2080                 return nfserr;
2081         eof = (read->rd_offset + maxcount >= read->rd_fhp->fh_dentry->d_inode->i_size);
2082
2083         WRITE32(eof);
2084         WRITE32(maxcount);
2085         ADJUST_ARGS();
2086         resp->xbuf->head[0].iov_len = (char*)p
2087                                         - (char*)resp->xbuf->head[0].iov_base;
2088         resp->xbuf->page_len = maxcount;
2089
2090         /* Use rest of head for padding and remaining ops: */
2091         resp->rqstp->rq_restailpage = 0;
2092         resp->xbuf->tail[0].iov_base = p;
2093         resp->xbuf->tail[0].iov_len = 0;
2094         if (maxcount&3) {
2095                 RESERVE_SPACE(4);
2096                 WRITE32(0);
2097                 resp->xbuf->tail[0].iov_base += maxcount&3;
2098                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2099                 ADJUST_ARGS();
2100         }
2101         return 0;
2102 }
2103
2104 static int
2105 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readlink *readlink)
2106 {
2107         int maxcount;
2108         char *page;
2109         ENCODE_HEAD;
2110
2111         if (nfserr)
2112                 return nfserr;
2113         if (resp->xbuf->page_len)
2114                 return nfserr_resource;
2115
2116         svc_take_page(resp->rqstp);
2117         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2118
2119         maxcount = PAGE_SIZE;
2120         RESERVE_SPACE(4);
2121
2122         /*
2123          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2124          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2125          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2126          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2127          */
2128         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2129         if (nfserr == nfserr_isdir)
2130                 return nfserr_inval;
2131         if (nfserr)
2132                 return nfserr;
2133
2134         WRITE32(maxcount);
2135         ADJUST_ARGS();
2136         resp->xbuf->head[0].iov_len = (char*)p
2137                                 - (char*)resp->xbuf->head[0].iov_base;
2138         resp->xbuf->page_len = maxcount;
2139
2140         /* Use rest of head for padding and remaining ops: */
2141         resp->rqstp->rq_restailpage = 0;
2142         resp->xbuf->tail[0].iov_base = p;
2143         resp->xbuf->tail[0].iov_len = 0;
2144         if (maxcount&3) {
2145                 RESERVE_SPACE(4);
2146                 WRITE32(0);
2147                 resp->xbuf->tail[0].iov_base += maxcount&3;
2148                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2149                 ADJUST_ARGS();
2150         }
2151         return 0;
2152 }
2153
2154 static int
2155 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readdir *readdir)
2156 {
2157         int maxcount;
2158         loff_t offset;
2159         u32 *page, *savep, *tailbase;
2160         ENCODE_HEAD;
2161
2162         if (nfserr)
2163                 return nfserr;
2164         if (resp->xbuf->page_len)
2165                 return nfserr_resource;
2166
2167         RESERVE_SPACE(8);  /* verifier */
2168         savep = p;
2169
2170         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2171         WRITE32(0);
2172         WRITE32(0);
2173         ADJUST_ARGS();
2174         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2175         tailbase = p;
2176
2177         maxcount = PAGE_SIZE;
2178         if (maxcount > readdir->rd_maxcount)
2179                 maxcount = readdir->rd_maxcount;
2180
2181         /*
2182          * Convert from bytes to words, account for the two words already
2183          * written, make sure to leave two words at the end for the next
2184          * pointer and eof field.
2185          */
2186         maxcount = (maxcount >> 2) - 4;
2187         if (maxcount < 0) {
2188                 nfserr =  nfserr_toosmall;
2189                 goto err_no_verf;
2190         }
2191
2192         svc_take_page(resp->rqstp);
2193         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2194         readdir->common.err = 0;
2195         readdir->buflen = maxcount;
2196         readdir->buffer = page;
2197         readdir->offset = NULL;
2198
2199         offset = readdir->rd_cookie;
2200         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2201                               &offset,
2202                               &readdir->common, nfsd4_encode_dirent);
2203         if (nfserr == nfs_ok &&
2204             readdir->common.err == nfserr_toosmall &&
2205             readdir->buffer == page)
2206                 nfserr = nfserr_toosmall;
2207         if (nfserr == nfserr_symlink)
2208                 nfserr = nfserr_notdir;
2209         if (nfserr)
2210                 goto err_no_verf;
2211
2212         if (readdir->offset)
2213                 xdr_encode_hyper(readdir->offset, offset);
2214
2215         p = readdir->buffer;
2216         *p++ = 0;       /* no more entries */
2217         *p++ = htonl(readdir->common.err == nfserr_eof);
2218         resp->xbuf->page_len = ((char*)p) - (char*)page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2219
2220         /* Use rest of head for padding and remaining ops: */
2221         resp->rqstp->rq_restailpage = 0;
2222         resp->xbuf->tail[0].iov_base = tailbase;
2223         resp->xbuf->tail[0].iov_len = 0;
2224         resp->p = resp->xbuf->tail[0].iov_base;
2225         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2226
2227         return 0;
2228 err_no_verf:
2229         p = savep;
2230         ADJUST_ARGS();
2231         return nfserr;
2232 }
2233
2234 static void
2235 nfsd4_encode_remove(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_remove *remove)
2236 {
2237         ENCODE_HEAD;
2238
2239         if (!nfserr) {
2240                 RESERVE_SPACE(20);
2241                 WRITECINFO(remove->rm_cinfo);
2242                 ADJUST_ARGS();
2243         }
2244 }
2245
2246 static void
2247 nfsd4_encode_rename(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_rename *rename)
2248 {
2249         ENCODE_HEAD;
2250
2251         if (!nfserr) {
2252                 RESERVE_SPACE(40);
2253                 WRITECINFO(rename->rn_sinfo);
2254                 WRITECINFO(rename->rn_tinfo);
2255                 ADJUST_ARGS();
2256         }
2257 }
2258
2259 /*
2260  * The SETATTR encode routine is special -- it always encodes a bitmap,
2261  * regardless of the error status.
2262  */
2263 static void
2264 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setattr *setattr)
2265 {
2266         ENCODE_HEAD;
2267
2268         RESERVE_SPACE(12);
2269         if (nfserr) {
2270                 WRITE32(2);
2271                 WRITE32(0);
2272                 WRITE32(0);
2273         }
2274         else {
2275                 WRITE32(2);
2276                 WRITE32(setattr->sa_bmval[0]);
2277                 WRITE32(setattr->sa_bmval[1]);
2278         }
2279         ADJUST_ARGS();
2280 }
2281
2282 static void
2283 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setclientid *scd)
2284 {
2285         ENCODE_HEAD;
2286
2287         if (!nfserr) {
2288                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2289                 WRITEMEM(&scd->se_clientid, 8);
2290                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2291                 ADJUST_ARGS();
2292         }
2293         else if (nfserr == nfserr_clid_inuse) {
2294                 RESERVE_SPACE(8);
2295                 WRITE32(0);
2296                 WRITE32(0);
2297                 ADJUST_ARGS();
2298         }
2299 }
2300
2301 static void
2302 nfsd4_encode_write(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_write *write)
2303 {
2304         ENCODE_HEAD;
2305
2306         if (!nfserr) {
2307                 RESERVE_SPACE(16);
2308                 WRITE32(write->wr_bytes_written);
2309                 WRITE32(write->wr_how_written);
2310                 WRITEMEM(write->wr_verifier.data, 8);
2311                 ADJUST_ARGS();
2312         }
2313 }
2314
2315 void
2316 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2317 {
2318         u32 *statp;
2319         ENCODE_HEAD;
2320
2321         RESERVE_SPACE(8);
2322         WRITE32(op->opnum);
2323         statp = p++;    /* to be backfilled at the end */
2324         ADJUST_ARGS();
2325
2326         switch (op->opnum) {
2327         case OP_ACCESS:
2328                 nfsd4_encode_access(resp, op->status, &op->u.access);
2329                 break;
2330         case OP_CLOSE:
2331                 nfsd4_encode_close(resp, op->status, &op->u.close);
2332                 break;
2333         case OP_COMMIT:
2334                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2335                 break;
2336         case OP_CREATE:
2337                 nfsd4_encode_create(resp, op->status, &op->u.create);
2338                 break;
2339         case OP_DELEGRETURN:
2340                 break;
2341         case OP_GETATTR:
2342                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2343                 break;
2344         case OP_GETFH:
2345                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2346                 break;
2347         case OP_LINK:
2348                 nfsd4_encode_link(resp, op->status, &op->u.link);
2349                 break;
2350         case OP_LOCK:
2351                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2352                 break;
2353         case OP_LOCKT:
2354                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2355                 break;
2356         case OP_LOCKU:
2357                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2358                 break;
2359         case OP_LOOKUP:
2360                 break;
2361         case OP_LOOKUPP:
2362                 break;
2363         case OP_NVERIFY:
2364                 break;
2365         case OP_OPEN:
2366                 nfsd4_encode_open(resp, op->status, &op->u.open);
2367                 break;
2368         case OP_OPEN_CONFIRM:
2369                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2370                 break;
2371         case OP_OPEN_DOWNGRADE:
2372                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2373                 break;
2374         case OP_PUTFH:
2375                 break;
2376         case OP_PUTROOTFH:
2377                 break;
2378         case OP_READ:
2379                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2380                 break;
2381         case OP_READDIR:
2382                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2383                 break;
2384         case OP_READLINK:
2385                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2386                 break;
2387         case OP_REMOVE:
2388                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2389                 break;
2390         case OP_RENAME:
2391                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2392                 break;
2393         case OP_RENEW:
2394                 break;
2395         case OP_RESTOREFH:
2396                 break;
2397         case OP_SAVEFH:
2398                 break;
2399         case OP_SETATTR:
2400                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2401                 break;
2402         case OP_SETCLIENTID:
2403                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2404                 break;
2405         case OP_SETCLIENTID_CONFIRM:
2406                 break;
2407         case OP_VERIFY:
2408                 break;
2409         case OP_WRITE:
2410                 nfsd4_encode_write(resp, op->status, &op->u.write);
2411                 break;
2412         case OP_RELEASE_LOCKOWNER:
2413                 break;
2414         default:
2415                 break;
2416         }
2417
2418         /*
2419          * Note: We write the status directly, instead of using WRITE32(),
2420          * since it is already in network byte order.
2421          */
2422         *statp = op->status;
2423 }
2424
2425 /*
2426  * Encode the reply stored in the stateowner reply cache
2427  *
2428  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2429  * previously sent already encoded operation.
2430  *
2431  * called with nfs4_lock_state() held
2432  */
2433 void
2434 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2435 {
2436         ENCODE_HEAD;
2437         struct nfs4_replay *rp = op->replay;
2438
2439         BUG_ON(!rp);
2440
2441         RESERVE_SPACE(8);
2442         WRITE32(op->opnum);
2443         *p++ = rp->rp_status;  /* already xdr'ed */
2444         ADJUST_ARGS();
2445
2446         RESERVE_SPACE(rp->rp_buflen);
2447         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2448         ADJUST_ARGS();
2449 }
2450
2451 /*
2452  * END OF "GENERIC" ENCODE ROUTINES.
2453  */
2454
2455 int
2456 nfs4svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
2457 {
2458         return xdr_ressize_check(rqstp, p);
2459 }
2460
2461 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2462 {
2463         if (args->ops != args->iops) {
2464                 kfree(args->ops);
2465                 args->ops = args->iops;
2466         }
2467         kfree(args->tmpp);
2468         args->tmpp = NULL;
2469         while (args->to_free) {
2470                 struct tmpbuf *tb = args->to_free;
2471                 args->to_free = tb->next;
2472                 tb->release(tb->buf);
2473                 kfree(tb);
2474         }
2475 }
2476
2477 int
2478 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundargs *args)
2479 {
2480         int status;
2481
2482         args->p = p;
2483         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2484         args->pagelist = rqstp->rq_arg.pages;
2485         args->pagelen = rqstp->rq_arg.page_len;
2486         args->tmpp = NULL;
2487         args->to_free = NULL;
2488         args->ops = args->iops;
2489         args->rqstp = rqstp;
2490
2491         status = nfsd4_decode_compound(args);
2492         if (status) {
2493                 nfsd4_release_compoundargs(args);
2494         }
2495         return !status;
2496 }
2497
2498 int
2499 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundres *resp)
2500 {
2501         /*
2502          * All that remains is to write the tag and operation count...
2503          */
2504         struct kvec *iov;
2505         p = resp->tagp;
2506         *p++ = htonl(resp->taglen);
2507         memcpy(p, resp->tag, resp->taglen);
2508         p += XDR_QUADLEN(resp->taglen);
2509         *p++ = htonl(resp->opcnt);
2510
2511         if (rqstp->rq_res.page_len)
2512                 iov = &rqstp->rq_res.tail[0];
2513         else
2514                 iov = &rqstp->rq_res.head[0];
2515         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2516         BUG_ON(iov->iov_len > PAGE_SIZE);
2517         return 1;
2518 }
2519
2520 /*
2521  * Local variables:
2522  *  c-basic-offset: 8
2523  * End:
2524  */