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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                 if (p != argp->tmpp)
 202                         BUG();
 203                 argp->tmpp = NULL;
 204         }
 205         if (defer_free(argp, kfree, p)) {
 206                 kfree(new);
 207                 return NULL;
 208         } else
 209                 return (char *)p;
 210 }
 211
 212
 213 static int
 214 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 215 {
 216         u32 bmlen;
 217         DECODE_HEAD;
 218
 219         bmval[0] = 0;
 220         bmval[1] = 0;
 221
 222         READ_BUF(4);
 223         READ32(bmlen);
 224         if (bmlen > 1000)
 225                 goto xdr_error;
 226
 227         READ_BUF(bmlen << 2);
 228         if (bmlen > 0)
 229                 READ32(bmval[0]);
 230         if (bmlen > 1)
 231                 READ32(bmval[1]);
 232
 233         DECODE_TAIL;
 234 }
 235
 236 static int
 237 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 238     struct nfs4_acl **acl)
 239 {
 240         int expected_len, len = 0;
 241         u32 dummy32;
 242         char *buf;
 243
 244         DECODE_HEAD;
 245         iattr->ia_valid = 0;
 246         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 247                 return status;
 248
 249         /*
 250          * According to spec, unsupported attributes return ERR_NOTSUPP;
 251          * read-only attributes return ERR_INVAL.
 252          */
 253         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 254                 return nfserr_attrnotsupp;
 255         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 256                 return nfserr_inval;
 257
 258         READ_BUF(4);
 259         READ32(expected_len);
 260
 261         if (bmval[0] & FATTR4_WORD0_SIZE) {
 262                 READ_BUF(8);
 263                 len += 8;
 264                 READ64(iattr->ia_size);
 265                 iattr->ia_valid |= ATTR_SIZE;
 266         }
 267         if (bmval[0] & FATTR4_WORD0_ACL) {
 268                 int nace, i;
 269                 struct nfs4_ace ace;
 270
 271                 READ_BUF(4); len += 4;
 272                 READ32(nace);
 273
 274                 *acl = nfs4_acl_new();
 275                 if (*acl == NULL) {
 276                         status = -ENOMEM;
 277                         goto out_nfserr;
 278                 }
 279                 defer_free(argp, (void (*)(const void *))nfs4_acl_free, *acl);
 280
 281                 for (i = 0; i < nace; i++) {
 282                         READ_BUF(16); len += 16;
 283                         READ32(ace.type);
 284                         READ32(ace.flag);
 285                         READ32(ace.access_mask);
 286                         READ32(dummy32);
 287                         READ_BUF(dummy32);
 288                         len += XDR_QUADLEN(dummy32) << 2;
 289                         READMEM(buf, dummy32);
 290                         ace.whotype = nfs4_acl_get_whotype(buf, dummy32);
 291                         status = 0;
 292                         if (ace.whotype != NFS4_ACL_WHO_NAMED)
 293                                 ace.who = 0;
 294                         else if (ace.flag & NFS4_ACE_IDENTIFIER_GROUP)
 295                                 status = nfsd_map_name_to_gid(argp->rqstp,
 296                                                 buf, dummy32, &ace.who);
 297                         else
 298                                 status = nfsd_map_name_to_uid(argp->rqstp,
 299                                                 buf, dummy32, &ace.who);
 300                         if (status)
 301                                 goto out_nfserr;
 302                         if (nfs4_acl_add_ace(*acl, ace.type, ace.flag,
 303                                  ace.access_mask, ace.whotype, ace.who) != 0) {
 304                                 status = -ENOMEM;
 305                                 goto out_nfserr;
 306                         }
 307                 }
 308         } else
 309                 *acl = NULL;
 310         if (bmval[1] & FATTR4_WORD1_MODE) {
 311                 READ_BUF(4);
 312                 len += 4;
 313                 READ32(iattr->ia_mode);
 314                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 315                 iattr->ia_valid |= ATTR_MODE;
 316         }
 317         if (bmval[1] & FATTR4_WORD1_OWNER) {
 318                 READ_BUF(4);
 319                 len += 4;
 320                 READ32(dummy32);
 321                 READ_BUF(dummy32);
 322                 len += (XDR_QUADLEN(dummy32) << 2);
 323                 READMEM(buf, dummy32);
 324                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 325                         goto out_nfserr;
 326                 iattr->ia_valid |= ATTR_UID;
 327         }
 328         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 329                 READ_BUF(4);
 330                 len += 4;
 331                 READ32(dummy32);
 332                 READ_BUF(dummy32);
 333                 len += (XDR_QUADLEN(dummy32) << 2);
 334                 READMEM(buf, dummy32);
 335                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 336                         goto out_nfserr;
 337                 iattr->ia_valid |= ATTR_GID;
 338         }
 339         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 340                 READ_BUF(4);
 341                 len += 4;
 342                 READ32(dummy32);
 343                 switch (dummy32) {
 344                 case NFS4_SET_TO_CLIENT_TIME:
 345                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 346                            all 32 bits of 'nseconds'. */
 347                         READ_BUF(12);
 348                         len += 12;
 349                         READ32(dummy32);
 350                         if (dummy32)
 351                                 return nfserr_inval;
 352                         READ32(iattr->ia_atime.tv_sec);
 353                         READ32(iattr->ia_atime.tv_nsec);
 354                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 355                                 return nfserr_inval;
 356                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 357                         break;
 358                 case NFS4_SET_TO_SERVER_TIME:
 359                         iattr->ia_valid |= ATTR_ATIME;
 360                         break;
 361                 default:
 362                         goto xdr_error;
 363                 }
 364         }
 365         if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
 366                 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 367                    all 32 bits of 'nseconds'. */
 368                 READ_BUF(12);
 369                 len += 12;
 370                 READ32(dummy32);
 371                 if (dummy32)
 372                         return nfserr_inval;
 373                 READ32(iattr->ia_ctime.tv_sec);
 374                 READ32(iattr->ia_ctime.tv_nsec);
 375                 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
 376                         return nfserr_inval;
 377                 iattr->ia_valid |= ATTR_CTIME;
 378         }
 379         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 380                 READ_BUF(4);
 381                 len += 4;
 382                 READ32(dummy32);
 383                 switch (dummy32) {
 384                 case NFS4_SET_TO_CLIENT_TIME:
 385                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 386                            all 32 bits of 'nseconds'. */
 387                         READ_BUF(12);
 388                         len += 12;
 389                         READ32(dummy32);
 390                         if (dummy32)
 391                                 return nfserr_inval;
 392                         READ32(iattr->ia_mtime.tv_sec);
 393                         READ32(iattr->ia_mtime.tv_nsec);
 394                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 395                                 return nfserr_inval;
 396                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 397                         break;
 398                 case NFS4_SET_TO_SERVER_TIME:
 399                         iattr->ia_valid |= ATTR_MTIME;
 400                         break;
 401                 default:
 402                         goto xdr_error;
 403                 }
 404         }
 405         if (len != expected_len)
 406                 goto xdr_error;
 407
 408         DECODE_TAIL;
 409
 410 out_nfserr:
 411         status = nfserrno(status);
 412         goto out;
 413 }
 414
 415 static int
 416 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 417 {
 418         DECODE_HEAD;
 419
 420         READ_BUF(4);
 421         READ32(access->ac_req_access);
 422
 423         DECODE_TAIL;
 424 }
 425
 426 static int
 427 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 428 {
 429         DECODE_HEAD;
 430
 431         close->cl_stateowner = NULL;
 432         READ_BUF(4 + sizeof(stateid_t));
 433         READ32(close->cl_seqid);
 434         READ32(close->cl_stateid.si_generation);
 435         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
 436
 437         DECODE_TAIL;
 438 }
 439
 440
 441 static int
 442 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 443 {
 444         DECODE_HEAD;
 445
 446         READ_BUF(12);
 447         READ64(commit->co_offset);
 448         READ32(commit->co_count);
 449
 450         DECODE_TAIL;
 451 }
 452
 453 static int
 454 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 455 {
 456         DECODE_HEAD;
 457
 458         READ_BUF(4);
 459         READ32(create->cr_type);
 460         switch (create->cr_type) {
 461         case NF4LNK:
 462                 READ_BUF(4);
 463                 READ32(create->cr_linklen);
 464                 READ_BUF(create->cr_linklen);
 465                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 466                 break;
 467         case NF4BLK:
 468         case NF4CHR:
 469                 READ_BUF(8);
 470                 READ32(create->cr_specdata1);
 471                 READ32(create->cr_specdata2);
 472                 break;
 473         case NF4SOCK:
 474         case NF4FIFO:
 475         case NF4DIR:
 476         default:
 477                 break;
 478         }
 479
 480         READ_BUF(4);
 481         READ32(create->cr_namelen);
 482         READ_BUF(create->cr_namelen);
 483         SAVEMEM(create->cr_name, create->cr_namelen);
 484         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 485                 return status;
 486
 487         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 488                 goto out;
 489
 490         DECODE_TAIL;
 491 }
 492
 493 static inline int
 494 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 495 {
 496         DECODE_HEAD;
 497
 498         READ_BUF(sizeof(stateid_t));
 499         READ32(dr->dr_stateid.si_generation);
 500         COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
 501
 502         DECODE_TAIL;
 503 }
 504
 505 static inline int
 506 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 507 {
 508         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 509 }
 510
 511 static int
 512 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 513 {
 514         DECODE_HEAD;
 515
 516         READ_BUF(4);
 517         READ32(link->li_namelen);
 518         READ_BUF(link->li_namelen);
 519         SAVEMEM(link->li_name, link->li_namelen);
 520         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 521                 return status;
 522
 523         DECODE_TAIL;
 524 }
 525
 526 static int
 527 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 528 {
 529         DECODE_HEAD;
 530
 531         lock->lk_replay_owner = NULL;
 532         /*
 533         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 534         */
 535         READ_BUF(28);
 536         READ32(lock->lk_type);
 537         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 538                 goto xdr_error;
 539         READ32(lock->lk_reclaim);
 540         READ64(lock->lk_offset);
 541         READ64(lock->lk_length);
 542         READ32(lock->lk_is_new);
 543
 544         if (lock->lk_is_new) {
 545                 READ_BUF(36);
 546                 READ32(lock->lk_new_open_seqid);
 547                 READ32(lock->lk_new_open_stateid.si_generation);
 548
 549                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
 550                 READ32(lock->lk_new_lock_seqid);
 551                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 552                 READ32(lock->lk_new_owner.len);
 553                 READ_BUF(lock->lk_new_owner.len);
 554                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 555         } else {
 556                 READ_BUF(20);
 557                 READ32(lock->lk_old_lock_stateid.si_generation);
 558                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
 559                 READ32(lock->lk_old_lock_seqid);
 560         }
 561
 562         DECODE_TAIL;
 563 }
 564
 565 static int
 566 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 567 {
 568         DECODE_HEAD;
 569
 570         READ_BUF(32);
 571         READ32(lockt->lt_type);
 572         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 573                 goto xdr_error;
 574         READ64(lockt->lt_offset);
 575         READ64(lockt->lt_length);
 576         COPYMEM(&lockt->lt_clientid, 8);
 577         READ32(lockt->lt_owner.len);
 578         READ_BUF(lockt->lt_owner.len);
 579         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 580
 581         DECODE_TAIL;
 582 }
 583
 584 static int
 585 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 586 {
 587         DECODE_HEAD;
 588
 589         locku->lu_stateowner = NULL;
 590         READ_BUF(24 + sizeof(stateid_t));
 591         READ32(locku->lu_type);
 592         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 593                 goto xdr_error;
 594         READ32(locku->lu_seqid);
 595         READ32(locku->lu_stateid.si_generation);
 596         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
 597         READ64(locku->lu_offset);
 598         READ64(locku->lu_length);
 599
 600         DECODE_TAIL;
 601 }
 602
 603 static int
 604 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 605 {
 606         DECODE_HEAD;
 607
 608         READ_BUF(4);
 609         READ32(lookup->lo_len);
 610         READ_BUF(lookup->lo_len);
 611         SAVEMEM(lookup->lo_name, lookup->lo_len);
 612         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 613                 return status;
 614
 615         DECODE_TAIL;
 616 }
 617
 618 static int
 619 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 620 {
 621         DECODE_HEAD;
 622
 623         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 624         open->op_iattr.ia_valid = 0;
 625         open->op_stateowner = NULL;
 626
 627         /* seqid, share_access, share_deny, clientid, ownerlen */
 628         READ_BUF(16 + sizeof(clientid_t));
 629         READ32(open->op_seqid);
 630         READ32(open->op_share_access);
 631         READ32(open->op_share_deny);
 632         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 633         READ32(open->op_owner.len);
 634
 635         /* owner, open_flag */
 636         READ_BUF(open->op_owner.len + 4);
 637         SAVEMEM(open->op_owner.data, open->op_owner.len);
 638         READ32(open->op_create);
 639         switch (open->op_create) {
 640         case NFS4_OPEN_NOCREATE:
 641                 break;
 642         case NFS4_OPEN_CREATE:
 643                 READ_BUF(4);
 644                 READ32(open->op_createmode);
 645                 switch (open->op_createmode) {
 646                 case NFS4_CREATE_UNCHECKED:
 647                 case NFS4_CREATE_GUARDED:
 648                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 649                                 goto out;
 650                         break;
 651                 case NFS4_CREATE_EXCLUSIVE:
 652                         READ_BUF(8);
 653                         COPYMEM(open->op_verf.data, 8);
 654                         break;
 655                 default:
 656                         goto xdr_error;
 657                 }
 658                 break;
 659         default:
 660                 goto xdr_error;
 661         }
 662
 663         /* open_claim */
 664         READ_BUF(4);
 665         READ32(open->op_claim_type);
 666         switch (open->op_claim_type) {
 667         case NFS4_OPEN_CLAIM_NULL:
 668         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 669                 READ_BUF(4);
 670                 READ32(open->op_fname.len);
 671                 READ_BUF(open->op_fname.len);
 672                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 673                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 674                         return status;
 675                 break;
 676         case NFS4_OPEN_CLAIM_PREVIOUS:
 677                 READ_BUF(4);
 678                 READ32(open->op_delegate_type);
 679                 break;
 680         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 681                 READ_BUF(sizeof(stateid_t) + 4);
 682                 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
 683                 READ32(open->op_fname.len);
 684                 READ_BUF(open->op_fname.len);
 685                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 686                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 687                         return status;
 688                 break;
 689         default:
 690                 goto xdr_error;
 691         }
 692
 693         DECODE_TAIL;
 694 }
 695
 696 static int
 697 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 698 {
 699         DECODE_HEAD;
 700
 701         open_conf->oc_stateowner = NULL;
 702         READ_BUF(4 + sizeof(stateid_t));
 703         READ32(open_conf->oc_req_stateid.si_generation);
 704         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
 705         READ32(open_conf->oc_seqid);
 706
 707         DECODE_TAIL;
 708 }
 709
 710 static int
 711 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 712 {
 713         DECODE_HEAD;
 714
 715         open_down->od_stateowner = NULL;
 716         READ_BUF(12 + sizeof(stateid_t));
 717         READ32(open_down->od_stateid.si_generation);
 718         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
 719         READ32(open_down->od_seqid);
 720         READ32(open_down->od_share_access);
 721         READ32(open_down->od_share_deny);
 722
 723         DECODE_TAIL;
 724 }
 725
 726 static int
 727 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 728 {
 729         DECODE_HEAD;
 730
 731         READ_BUF(4);
 732         READ32(putfh->pf_fhlen);
 733         if (putfh->pf_fhlen > NFS4_FHSIZE)
 734                 goto xdr_error;
 735         READ_BUF(putfh->pf_fhlen);
 736         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 737
 738         DECODE_TAIL;
 739 }
 740
 741 static int
 742 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 743 {
 744         DECODE_HEAD;
 745
 746         READ_BUF(sizeof(stateid_t) + 12);
 747         READ32(read->rd_stateid.si_generation);
 748         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
 749         READ64(read->rd_offset);
 750         READ32(read->rd_length);
 751
 752         DECODE_TAIL;
 753 }
 754
 755 static int
 756 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 757 {
 758         DECODE_HEAD;
 759
 760         READ_BUF(24);
 761         READ64(readdir->rd_cookie);
 762         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 763         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 764         READ32(readdir->rd_maxcount);
 765         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 766                 goto out;
 767
 768         DECODE_TAIL;
 769 }
 770
 771 static int
 772 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 773 {
 774         DECODE_HEAD;
 775
 776         READ_BUF(4);
 777         READ32(remove->rm_namelen);
 778         READ_BUF(remove->rm_namelen);
 779         SAVEMEM(remove->rm_name, remove->rm_namelen);
 780         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 781                 return status;
 782
 783         DECODE_TAIL;
 784 }
 785
 786 static int
 787 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 788 {
 789         DECODE_HEAD;
 790
 791         READ_BUF(4);
 792         READ32(rename->rn_snamelen);
 793         READ_BUF(rename->rn_snamelen + 4);
 794         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 795         READ32(rename->rn_tnamelen);
 796         READ_BUF(rename->rn_tnamelen);
 797         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 798         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 799                 return status;
 800         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 801                 return status;
 802
 803         DECODE_TAIL;
 804 }
 805
 806 static int
 807 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 808 {
 809         DECODE_HEAD;
 810
 811         READ_BUF(sizeof(clientid_t));
 812         COPYMEM(clientid, sizeof(clientid_t));
 813
 814         DECODE_TAIL;
 815 }
 816
 817 static int
 818 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 819 {
 820         DECODE_HEAD;
 821
 822         READ_BUF(sizeof(stateid_t));
 823         READ32(setattr->sa_stateid.si_generation);
 824         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 825         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 826                 goto out;
 827
 828         DECODE_TAIL;
 829 }
 830
 831 static int
 832 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 833 {
 834         DECODE_HEAD;
 835
 836         READ_BUF(12);
 837         COPYMEM(setclientid->se_verf.data, 8);
 838         READ32(setclientid->se_namelen);
 839
 840         READ_BUF(setclientid->se_namelen + 8);
 841         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 842         READ32(setclientid->se_callback_prog);
 843         READ32(setclientid->se_callback_netid_len);
 844
 845         READ_BUF(setclientid->se_callback_netid_len + 4);
 846         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 847         READ32(setclientid->se_callback_addr_len);
 848
 849         READ_BUF(setclientid->se_callback_addr_len + 4);
 850         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 851         READ32(setclientid->se_callback_ident);
 852
 853         DECODE_TAIL;
 854 }
 855
 856 static int
 857 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 858 {
 859         DECODE_HEAD;
 860
 861         READ_BUF(8 + sizeof(nfs4_verifier));
 862         COPYMEM(&scd_c->sc_clientid, 8);
 863         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 864
 865         DECODE_TAIL;
 866 }
 867
 868 /* Also used for NVERIFY */
 869 static int
 870 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 871 {
 872 #if 0
 873         struct nfsd4_compoundargs save = {
 874                 .p = argp->p,
 875                 .end = argp->end,
 876                 .rqstp = argp->rqstp,
 877         };
 878         u32             ve_bmval[2];
 879         struct iattr    ve_iattr;           /* request */
 880         struct nfs4_acl *ve_acl;            /* request */
 881 #endif
 882         DECODE_HEAD;
 883
 884         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 885                 goto out;
 886
 887         /* For convenience's sake, we compare raw xdr'd attributes in
 888          * nfsd4_proc_verify; however we still decode here just to return
 889          * correct error in case of bad xdr. */
 890 #if 0
 891         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 892         if (status == nfserr_inval) {
 893                 status = nfserrno(status);
 894                 goto out;
 895         }
 896 #endif
 897         READ_BUF(4);
 898         READ32(verify->ve_attrlen);
 899         READ_BUF(verify->ve_attrlen);
 900         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 901
 902         DECODE_TAIL;
 903 }
 904
 905 static int
 906 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 907 {
 908         int avail;
 909         int v;
 910         int len;
 911         DECODE_HEAD;
 912
 913         READ_BUF(sizeof(stateid_opaque_t) + 20);
 914         READ32(write->wr_stateid.si_generation);
 915         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
 916         READ64(write->wr_offset);
 917         READ32(write->wr_stable_how);
 918         if (write->wr_stable_how > 2)
 919                 goto xdr_error;
 920         READ32(write->wr_buflen);
 921
 922         /* Sorry .. no magic macros for this.. *
 923          * READ_BUF(write->wr_buflen);
 924          * SAVEMEM(write->wr_buf, write->wr_buflen);
 925          */
 926         avail = (char*)argp->end - (char*)argp->p;
 927         if (avail + argp->pagelen < write->wr_buflen) {
 928                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__);
 929                 goto xdr_error;
 930         }
 931         write->wr_vec[0].iov_base = p;
 932         write->wr_vec[0].iov_len = avail;
 933         v = 0;
 934         len = write->wr_buflen;
 935         while (len > write->wr_vec[v].iov_len) {
 936                 len -= write->wr_vec[v].iov_len;
 937                 v++;
 938                 write->wr_vec[v].iov_base = page_address(argp->pagelist[0]);
 939                 argp->pagelist++;
 940                 if (argp->pagelen >= PAGE_SIZE) {
 941                         write->wr_vec[v].iov_len = PAGE_SIZE;
 942                         argp->pagelen -= PAGE_SIZE;
 943                 } else {
 944                         write->wr_vec[v].iov_len = argp->pagelen;
 945                         argp->pagelen -= len;
 946                 }
 947         }
 948         argp->end = (u32*) (write->wr_vec[v].iov_base + write->wr_vec[v].iov_len);
 949         argp->p = (u32*)  (write->wr_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 950         write->wr_vec[v].iov_len = len;
 951         write->wr_vlen = v+1;
 952
 953         DECODE_TAIL;
 954 }
 955
 956 static int
 957 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 958 {
 959         DECODE_HEAD;
 960
 961         READ_BUF(12);
 962         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 963         READ32(rlockowner->rl_owner.len);
 964         READ_BUF(rlockowner->rl_owner.len);
 965         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 966
 967         DECODE_TAIL;
 968 }
 969
 970 static int
 971 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 972 {
 973         DECODE_HEAD;
 974         struct nfsd4_op *op;
 975         int i;
 976
 977         /*
 978          * XXX: According to spec, we should check the tag
 979          * for UTF-8 compliance.  I'm postponing this for
 980          * now because it seems that some clients do use
 981          * binary tags.
 982          */
 983         READ_BUF(4);
 984         READ32(argp->taglen);
 985         READ_BUF(argp->taglen + 8);
 986         SAVEMEM(argp->tag, argp->taglen);
 987         READ32(argp->minorversion);
 988         READ32(argp->opcnt);
 989
 990         if (argp->taglen > NFSD4_MAX_TAGLEN)
 991                 goto xdr_error;
 992         if (argp->opcnt > 100)
 993                 goto xdr_error;
 994
 995         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
 996                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
 997                 if (!argp->ops) {
 998                         argp->ops = argp->iops;
 999                         printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
1000                         goto xdr_error;
1001                 }
1002         }
1003
1004         for (i = 0; i < argp->opcnt; i++) {
1005                 op = &argp->ops[i];
1006                 op->replay = NULL;
1007
1008                 /*
1009                  * We can't use READ_BUF() here because we need to handle
1010                  * a missing opcode as an OP_WRITE + 1. So we need to check
1011                  * to see if we're truly at the end of our buffer or if there
1012                  * is another page we need to flip to.
1013                  */
1014
1015                 if (argp->p == argp->end) {
1016                         if (argp->pagelen < 4) {
1017                                 /* There isn't an opcode still on the wire */
1018                                 op->opnum = OP_WRITE + 1;
1019                                 op->status = nfserr_bad_xdr;
1020                                 argp->opcnt = i+1;
1021                                 break;
1022                         }
1023
1024                         /*
1025                          * False alarm. We just hit a page boundary, but there
1026                          * is still data available.  Move pointer across page
1027                          * boundary.  *snip from READ_BUF*
1028                          */
1029                         argp->p = page_address(argp->pagelist[0]);
1030                         argp->pagelist++;
1031                         if (argp->pagelen < PAGE_SIZE) {
1032                                 argp->end = p + (argp->pagelen>>2);
1033                                 argp->pagelen = 0;
1034                         } else {
1035                                 argp->end = p + (PAGE_SIZE>>2);
1036                                 argp->pagelen -= PAGE_SIZE;
1037                         }
1038                 }
1039                 op->opnum = ntohl(*argp->p++);
1040
1041                 switch (op->opnum) {
1042                 case 2: /* Reserved operation */
1043                         op->opnum = OP_ILLEGAL;
1044                         if (argp->minorversion == 0)
1045                                 op->status = nfserr_op_illegal;
1046                         else
1047                                 op->status = nfserr_minor_vers_mismatch;
1048                         break;
1049                 case OP_ACCESS:
1050                         op->status = nfsd4_decode_access(argp, &op->u.access);
1051                         break;
1052                 case OP_CLOSE:
1053                         op->status = nfsd4_decode_close(argp, &op->u.close);
1054                         break;
1055                 case OP_COMMIT:
1056                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1057                         break;
1058                 case OP_CREATE:
1059                         op->status = nfsd4_decode_create(argp, &op->u.create);
1060                         break;
1061                 case OP_DELEGRETURN:
1062                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1063                         break;
1064                 case OP_GETATTR:
1065                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1066                         break;
1067                 case OP_GETFH:
1068                         op->status = nfs_ok;
1069                         break;
1070                 case OP_LINK:
1071                         op->status = nfsd4_decode_link(argp, &op->u.link);
1072                         break;
1073                 case OP_LOCK:
1074                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1075                         break;
1076                 case OP_LOCKT:
1077                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1078                         break;
1079                 case OP_LOCKU:
1080                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1081                         break;
1082                 case OP_LOOKUP:
1083                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1084                         break;
1085                 case OP_LOOKUPP:
1086                         op->status = nfs_ok;
1087                         break;
1088                 case OP_NVERIFY:
1089                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1090                         break;
1091                 case OP_OPEN:
1092                         op->status = nfsd4_decode_open(argp, &op->u.open);
1093                         break;
1094                 case OP_OPEN_CONFIRM:
1095                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1096                         break;
1097                 case OP_OPEN_DOWNGRADE:
1098                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1099                         break;
1100                 case OP_PUTFH:
1101                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1102                         break;
1103                 case OP_PUTROOTFH:
1104                         op->status = nfs_ok;
1105                         break;
1106                 case OP_READ:
1107                         op->status = nfsd4_decode_read(argp, &op->u.read);
1108                         break;
1109                 case OP_READDIR:
1110                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1111                         break;
1112                 case OP_READLINK:
1113                         op->status = nfs_ok;
1114                         break;
1115                 case OP_REMOVE:
1116                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1117                         break;
1118                 case OP_RENAME:
1119                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1120                         break;
1121                 case OP_RESTOREFH:
1122                         op->status = nfs_ok;
1123                         break;
1124                 case OP_RENEW:
1125                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1126                         break;
1127                 case OP_SAVEFH:
1128                         op->status = nfs_ok;
1129                         break;
1130                 case OP_SETATTR:
1131                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1132                         break;
1133                 case OP_SETCLIENTID:
1134                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1135                         break;
1136                 case OP_SETCLIENTID_CONFIRM:
1137                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1138                         break;
1139                 case OP_VERIFY:
1140                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1141                         break;
1142                 case OP_WRITE:
1143                         op->status = nfsd4_decode_write(argp, &op->u.write);
1144                         break;
1145                 case OP_RELEASE_LOCKOWNER:
1146                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1147                         break;
1148                 default:
1149                         op->opnum = OP_ILLEGAL;
1150                         op->status = nfserr_op_illegal;
1151                         break;
1152                 }
1153
1154                 if (op->status) {
1155                         argp->opcnt = i+1;
1156                         break;
1157                 }
1158         }
1159
1160         DECODE_TAIL;
1161 }
1162 /*
1163  * END OF "GENERIC" DECODE ROUTINES.
1164  */
1165
1166 /*
1167  * START OF "GENERIC" ENCODE ROUTINES.
1168  *   These may look a little ugly since they are imported from a "generic"
1169  * set of XDR encode/decode routines which are intended to be shared by
1170  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1171  *
1172  * If the pain of reading these is too great, it should be a straightforward
1173  * task to translate them into Linux-specific versions which are more
1174  * consistent with the style used in NFSv2/v3...
1175  */
1176 #define ENCODE_HEAD              u32 *p
1177
1178 #define WRITE32(n)               *p++ = htonl(n)
1179 #define WRITE64(n)               do {                           \
1180         *p++ = htonl((u32)((n) >> 32));                         \
1181         *p++ = htonl((u32)(n));                                 \
1182 } while (0)
1183 #define WRITEMEM(ptr,nbytes)     do {                           \
1184         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1185         memcpy(p, ptr, nbytes);                                 \
1186         p += XDR_QUADLEN(nbytes);                               \
1187 } while (0)
1188 #define WRITECINFO(c)           do {                            \
1189         *p++ = htonl(c.atomic);                                 \
1190         *p++ = htonl(c.before_ctime_sec);                               \
1191         *p++ = htonl(c.before_ctime_nsec);                              \
1192         *p++ = htonl(c.after_ctime_sec);                                \
1193         *p++ = htonl(c.after_ctime_nsec);                               \
1194 } while (0)
1195
1196 #define RESERVE_SPACE(nbytes)   do {                            \
1197         p = resp->p;                                            \
1198         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1199 } while (0)
1200 #define ADJUST_ARGS()           resp->p = p
1201
1202 /*
1203  * Header routine to setup seqid operation replay cache
1204  */
1205 #define ENCODE_SEQID_OP_HEAD                                    \
1206         u32 *p;                                                 \
1207         u32 *save;                                              \
1208                                                                 \
1209         save = resp->p;
1210
1211 /*
1212  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1213  * is where sequence id's are incremented, and the replay cache is filled.
1214  * Note that we increment sequence id's here, at the last moment, so we're sure
1215  * we know whether the error to be returned is a sequence id mutating error.
1216  */
1217
1218 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1219         if (seqid_mutating_err(nfserr) && stateowner) {         \
1220                 stateowner->so_seqid++;                         \
1221                 stateowner->so_replay.rp_status = nfserr;       \
1222                 stateowner->so_replay.rp_buflen =               \
1223                           (((char *)(resp)->p - (char *)save)); \
1224                 memcpy(stateowner->so_replay.rp_buf, save,      \
1225                         stateowner->so_replay.rp_buflen);       \
1226         } } while (0);
1227
1228
1229 static u32 nfs4_ftypes[16] = {
1230         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1231         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1232         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1233         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1234 };
1235
1236 static int
1237 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1238                         u32 **p, int *buflen)
1239 {
1240         int status;
1241
1242         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1243                 return nfserr_resource;
1244         if (whotype != NFS4_ACL_WHO_NAMED)
1245                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1246         else if (group)
1247                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1248         else
1249                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1250         if (status < 0)
1251                 return nfserrno(status);
1252         *p = xdr_encode_opaque(*p, NULL, status);
1253         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1254         BUG_ON(*buflen < 0);
1255         return 0;
1256 }
1257
1258 static inline int
1259 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, u32 **p, int *buflen)
1260 {
1261         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1262 }
1263
1264 static inline int
1265 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, u32 **p, int *buflen)
1266 {
1267         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1268 }
1269
1270 static inline int
1271 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1272                 u32 **p, int *buflen)
1273 {
1274         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1275 }
1276
1277
1278 /*
1279  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1280  * ourselves.
1281  *
1282  * @countp is the buffer size in _words_; upon successful return this becomes
1283  * replaced with the number of words written.
1284  */
1285 int
1286 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1287                 struct dentry *dentry, u32 *buffer, int *countp, u32 *bmval,
1288                 struct svc_rqst *rqstp)
1289 {
1290         u32 bmval0 = bmval[0];
1291         u32 bmval1 = bmval[1];
1292         struct kstat stat;
1293         struct svc_fh tempfh;
1294         struct kstatfs statfs;
1295         int buflen = *countp << 2;
1296         u32 *attrlenp;
1297         u32 dummy;
1298         u64 dummy64;
1299         u32 *p = buffer;
1300         int status;
1301         int aclsupport = 0;
1302         struct nfs4_acl *acl = NULL;
1303
1304         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1305         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1306         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1307
1308         status = vfs_getattr(exp->ex_mnt, dentry, &stat);
1309         if (status)
1310                 goto out_nfserr;
1311         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1312             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1313                        FATTR4_WORD1_SPACE_TOTAL))) {
1314                 status = vfs_statfs(dentry->d_inode->i_sb, &statfs);
1315                 if (status)
1316                         goto out_nfserr;
1317         }
1318         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1319                 fh_init(&tempfh, NFS4_FHSIZE);
1320                 status = fh_compose(&tempfh, exp, dentry, NULL);
1321                 if (status)
1322                         goto out;
1323                 fhp = &tempfh;
1324         }
1325         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1326                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1327                 status = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1328                 aclsupport = (status == 0);
1329                 if (bmval0 & FATTR4_WORD0_ACL) {
1330                         if (status == -EOPNOTSUPP)
1331                                 bmval0 &= ~FATTR4_WORD0_ACL;
1332                         else if (status == -EINVAL) {
1333                                 status = nfserr_attrnotsupp;
1334                                 goto out;
1335                         } else if (status != 0)
1336                                 goto out_nfserr;
1337                 }
1338         }
1339         if ((buflen -= 16) < 0)
1340                 goto out_resource;
1341
1342         WRITE32(2);
1343         WRITE32(bmval0);
1344         WRITE32(bmval1);
1345         attrlenp = p++;                /* to be backfilled later */
1346
1347         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1348                 if ((buflen -= 12) < 0)
1349                         goto out_resource;
1350                 WRITE32(2);
1351                 WRITE32(aclsupport ?
1352                         NFSD_SUPPORTED_ATTRS_WORD0 :
1353                         NFSD_SUPPORTED_ATTRS_WORD0 & ~FATTR4_WORD0_ACL);
1354                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1355         }
1356         if (bmval0 & FATTR4_WORD0_TYPE) {
1357                 if ((buflen -= 4) < 0)
1358                         goto out_resource;
1359                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1360                 if (dummy == NF4BAD)
1361                         goto out_serverfault;
1362                 WRITE32(dummy);
1363         }
1364         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1365                 if ((buflen -= 4) < 0)
1366                         goto out_resource;
1367                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1368                         WRITE32(NFS4_FH_PERSISTENT);
1369                 else
1370                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1371         }
1372         if (bmval0 & FATTR4_WORD0_CHANGE) {
1373                 /*
1374                  * Note: This _must_ be consistent with the scheme for writing
1375                  * change_info, so any changes made here must be reflected there
1376                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1377                  * macro above.)
1378                  */
1379                 if ((buflen -= 8) < 0)
1380                         goto out_resource;
1381                 WRITE32(stat.ctime.tv_sec);
1382                 WRITE32(stat.ctime.tv_nsec);
1383         }
1384         if (bmval0 & FATTR4_WORD0_SIZE) {
1385                 if ((buflen -= 8) < 0)
1386                         goto out_resource;
1387                 WRITE64(stat.size);
1388         }
1389         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1390                 if ((buflen -= 4) < 0)
1391                         goto out_resource;
1392                 WRITE32(1);
1393         }
1394         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1395                 if ((buflen -= 4) < 0)
1396                         goto out_resource;
1397                 WRITE32(1);
1398         }
1399         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1400                 if ((buflen -= 4) < 0)
1401                         goto out_resource;
1402                 WRITE32(0);
1403         }
1404         if (bmval0 & FATTR4_WORD0_FSID) {
1405                 if ((buflen -= 16) < 0)
1406                         goto out_resource;
1407                 if (is_fsid(fhp, rqstp->rq_reffh)) {
1408                         WRITE64((u64)exp->ex_fsid);
1409                         WRITE64((u64)0);
1410                 } else {
1411                         WRITE32(0);
1412                         WRITE32(MAJOR(stat.dev));
1413                         WRITE32(0);
1414                         WRITE32(MINOR(stat.dev));
1415                 }
1416         }
1417         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1418                 if ((buflen -= 4) < 0)
1419                         goto out_resource;
1420                 WRITE32(0);
1421         }
1422         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1423                 if ((buflen -= 4) < 0)
1424                         goto out_resource;
1425                 WRITE32(NFSD_LEASE_TIME);
1426         }
1427         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1428                 if ((buflen -= 4) < 0)
1429                         goto out_resource;
1430                 WRITE32(0);
1431         }
1432         if (bmval0 & FATTR4_WORD0_ACL) {
1433                 struct nfs4_ace *ace;
1434                 struct list_head *h;
1435
1436                 if (acl == NULL) {
1437                         if ((buflen -= 4) < 0)
1438                                 goto out_resource;
1439
1440                         WRITE32(0);
1441                         goto out_acl;
1442                 }
1443                 if ((buflen -= 4) < 0)
1444                         goto out_resource;
1445                 WRITE32(acl->naces);
1446
1447                 list_for_each(h, &acl->ace_head) {
1448                         ace = list_entry(h, struct nfs4_ace, l_ace);
1449
1450                         if ((buflen -= 4*3) < 0)
1451                                 goto out_resource;
1452                         WRITE32(ace->type);
1453                         WRITE32(ace->flag);
1454                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1455                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1456                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1457                                 &p, &buflen);
1458                         if (status == nfserr_resource)
1459                                 goto out_resource;
1460                         if (status)
1461                                 goto out;
1462                 }
1463         }
1464 out_acl:
1465         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1466                 if ((buflen -= 4) < 0)
1467                         goto out_resource;
1468                 WRITE32(aclsupport ?
1469                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1470         }
1471         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1472                 if ((buflen -= 4) < 0)
1473                         goto out_resource;
1474                 WRITE32(1);
1475         }
1476         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1477                 if ((buflen -= 4) < 0)
1478                         goto out_resource;
1479                 WRITE32(1);
1480         }
1481         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1482                 if ((buflen -= 4) < 0)
1483                         goto out_resource;
1484                 WRITE32(1);
1485         }
1486         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1487                 if ((buflen -= 4) < 0)
1488                         goto out_resource;
1489                 WRITE32(1);
1490         }
1491         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1492                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1493                 if (buflen < 0)
1494                         goto out_resource;
1495                 WRITE32(fhp->fh_handle.fh_size);
1496                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1497         }
1498         if (bmval0 & FATTR4_WORD0_FILEID) {
1499                 if ((buflen -= 8) < 0)
1500                         goto out_resource;
1501                 WRITE64((u64) stat.ino);
1502         }
1503         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1504                 if ((buflen -= 8) < 0)
1505                         goto out_resource;
1506                 WRITE64((u64) statfs.f_ffree);
1507         }
1508         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1509                 if ((buflen -= 8) < 0)
1510                         goto out_resource;
1511                 WRITE64((u64) statfs.f_ffree);
1512         }
1513         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1514                 if ((buflen -= 8) < 0)
1515                         goto out_resource;
1516                 WRITE64((u64) statfs.f_files);
1517         }
1518         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1519                 if ((buflen -= 4) < 0)
1520                         goto out_resource;
1521                 WRITE32(1);
1522         }
1523         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1524                 if ((buflen -= 8) < 0)
1525                         goto out_resource;
1526                 WRITE64(~(u64)0);
1527         }
1528         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1529                 if ((buflen -= 4) < 0)
1530                         goto out_resource;
1531                 WRITE32(255);
1532         }
1533         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1534                 if ((buflen -= 4) < 0)
1535                         goto out_resource;
1536                 WRITE32(~(u32) 0);
1537         }
1538         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1539                 if ((buflen -= 8) < 0)
1540                         goto out_resource;
1541                 WRITE64((u64) NFSSVC_MAXBLKSIZE);
1542         }
1543         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1544                 if ((buflen -= 8) < 0)
1545                         goto out_resource;
1546                 WRITE64((u64) NFSSVC_MAXBLKSIZE);
1547         }
1548         if (bmval1 & FATTR4_WORD1_MODE) {
1549                 if ((buflen -= 4) < 0)
1550                         goto out_resource;
1551                 WRITE32(stat.mode & S_IALLUGO);
1552         }
1553         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1554                 if ((buflen -= 4) < 0)
1555                         goto out_resource;
1556                 WRITE32(1);
1557         }
1558         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1559                 if ((buflen -= 4) < 0)
1560                         goto out_resource;
1561                 WRITE32(stat.nlink);
1562         }
1563         if (bmval1 & FATTR4_WORD1_OWNER) {
1564                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1565                 if (status == nfserr_resource)
1566                         goto out_resource;
1567                 if (status)
1568                         goto out;
1569         }
1570         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1571                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1572                 if (status == nfserr_resource)
1573                         goto out_resource;
1574                 if (status)
1575                         goto out;
1576         }
1577         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1578                 if ((buflen -= 8) < 0)
1579                         goto out_resource;
1580                 WRITE32((u32) MAJOR(stat.rdev));
1581                 WRITE32((u32) MINOR(stat.rdev));
1582         }
1583         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1584                 if ((buflen -= 8) < 0)
1585                         goto out_resource;
1586                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1587                 WRITE64(dummy64);
1588         }
1589         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1590                 if ((buflen -= 8) < 0)
1591                         goto out_resource;
1592                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1593                 WRITE64(dummy64);
1594         }
1595         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1596                 if ((buflen -= 8) < 0)
1597                         goto out_resource;
1598                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1599                 WRITE64(dummy64);
1600         }
1601         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1602                 if ((buflen -= 8) < 0)
1603                         goto out_resource;
1604                 dummy64 = (u64)stat.blocks << 9;
1605                 WRITE64(dummy64);
1606         }
1607         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1608                 if ((buflen -= 12) < 0)
1609                         goto out_resource;
1610                 WRITE32(0);
1611                 WRITE32(stat.atime.tv_sec);
1612                 WRITE32(stat.atime.tv_nsec);
1613         }
1614         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1615                 if ((buflen -= 12) < 0)
1616                         goto out_resource;
1617                 WRITE32(0);
1618                 WRITE32(1);
1619                 WRITE32(0);
1620         }
1621         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1622                 if ((buflen -= 12) < 0)
1623                         goto out_resource;
1624                 WRITE32(0);
1625                 WRITE32(stat.ctime.tv_sec);
1626                 WRITE32(stat.ctime.tv_nsec);
1627         }
1628         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1629                 if ((buflen -= 12) < 0)
1630                         goto out_resource;
1631                 WRITE32(0);
1632                 WRITE32(stat.mtime.tv_sec);
1633                 WRITE32(stat.mtime.tv_nsec);
1634         }
1635         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1636                 struct dentry *mnt_pnt, *mnt_root;
1637
1638                 if ((buflen -= 8) < 0)
1639                         goto out_resource;
1640                 mnt_root = exp->ex_mnt->mnt_root;
1641                 if (mnt_root->d_inode == dentry->d_inode) {
1642                         mnt_pnt = exp->ex_mnt->mnt_mountpoint;
1643                         WRITE64((u64) mnt_pnt->d_inode->i_ino);
1644                 } else
1645                         WRITE64((u64) stat.ino);
1646         }
1647         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1648         *countp = p - buffer;
1649         status = nfs_ok;
1650
1651 out:
1652         nfs4_acl_free(acl);
1653         if (fhp == &tempfh)
1654                 fh_put(&tempfh);
1655         return status;
1656 out_nfserr:
1657         status = nfserrno(status);
1658         goto out;
1659 out_resource:
1660         *countp = 0;
1661         status = nfserr_resource;
1662         goto out;
1663 out_serverfault:
1664         status = nfserr_serverfault;
1665         goto out;
1666 }
1667
1668 static int
1669 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1670                 const char *name, int namlen, u32 *p, int *buflen)
1671 {
1672         struct svc_export *exp = cd->rd_fhp->fh_export;
1673         struct dentry *dentry;
1674         int nfserr;
1675
1676         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1677         if (IS_ERR(dentry))
1678                 return nfserrno(PTR_ERR(dentry));
1679
1680         exp_get(exp);
1681         if (d_mountpoint(dentry)) {
1682                 if (nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp)) {
1683                 /*
1684                  * -EAGAIN is the only error returned from
1685                  * nfsd_cross_mnt() and it indicates that an
1686                  * up-call has  been initiated to fill in the export
1687                  * options on exp.  When the answer comes back,
1688                  * this call will be retried.
1689                  */
1690                         nfserr = nfserr_dropit;
1691                         goto out_put;
1692                 }
1693
1694         }
1695         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1696                                         cd->rd_rqstp);
1697 out_put:
1698         dput(dentry);
1699         exp_put(exp);
1700         return nfserr;
1701 }
1702
1703 static u32 *
1704 nfsd4_encode_rdattr_error(u32 *p, int buflen, int nfserr)
1705 {
1706         u32 *attrlenp;
1707
1708         if (buflen < 6)
1709                 return NULL;
1710         *p++ = htonl(2);
1711         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1712         *p++ = htonl(0);                         /* bmval1 */
1713
1714         attrlenp = p++;
1715         *p++ = nfserr;       /* no htonl */
1716         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1717         return p;
1718 }
1719
1720 static int
1721 nfsd4_encode_dirent(struct readdir_cd *ccd, const char *name, int namlen,
1722                     loff_t offset, ino_t ino, unsigned int d_type)
1723 {
1724         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1725         int buflen;
1726         u32 *p = cd->buffer;
1727         int nfserr = nfserr_toosmall;
1728
1729         /* In nfsv4, "." and ".." never make it onto the wire.. */
1730         if (name && isdotent(name, namlen)) {
1731                 cd->common.err = nfs_ok;
1732                 return 0;
1733         }
1734
1735         if (cd->offset)
1736                 xdr_encode_hyper(cd->offset, (u64) offset);
1737
1738         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1739         if (buflen < 0)
1740                 goto fail;
1741
1742         *p++ = xdr_one;                             /* mark entry present */
1743         cd->offset = p;                             /* remember pointer */
1744         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1745         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1746
1747         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1748         switch (nfserr) {
1749         case nfs_ok:
1750                 p += buflen;
1751                 break;
1752         case nfserr_resource:
1753                 nfserr = nfserr_toosmall;
1754                 goto fail;
1755         case nfserr_dropit:
1756                 goto fail;
1757         default:
1758                 /*
1759                  * If the client requested the RDATTR_ERROR attribute,
1760                  * we stuff the error code into this attribute
1761                  * and continue.  If this attribute was not requested,
1762                  * then in accordance with the spec, we fail the
1763                  * entire READDIR operation(!)
1764                  */
1765                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1766                         goto fail;
1767                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1768                 if (p == NULL) {
1769                         nfserr = nfserr_toosmall;
1770                         goto fail;
1771                 }
1772         }
1773         cd->buflen -= (p - cd->buffer);
1774         cd->buffer = p;
1775         cd->common.err = nfs_ok;
1776         return 0;
1777 fail:
1778         cd->common.err = nfserr;
1779         return -EINVAL;
1780 }
1781
1782 static void
1783 nfsd4_encode_access(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_access *access)
1784 {
1785         ENCODE_HEAD;
1786
1787         if (!nfserr) {
1788                 RESERVE_SPACE(8);
1789                 WRITE32(access->ac_supported);
1790                 WRITE32(access->ac_resp_access);
1791                 ADJUST_ARGS();
1792         }
1793 }
1794
1795 static void
1796 nfsd4_encode_close(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_close *close)
1797 {
1798         ENCODE_SEQID_OP_HEAD;
1799
1800         if (!nfserr) {
1801                 RESERVE_SPACE(sizeof(stateid_t));
1802                 WRITE32(close->cl_stateid.si_generation);
1803                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1804                 ADJUST_ARGS();
1805         }
1806         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1807 }
1808
1809
1810 static void
1811 nfsd4_encode_commit(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_commit *commit)
1812 {
1813         ENCODE_HEAD;
1814
1815         if (!nfserr) {
1816                 RESERVE_SPACE(8);
1817                 WRITEMEM(commit->co_verf.data, 8);
1818                 ADJUST_ARGS();
1819         }
1820 }
1821
1822 static void
1823 nfsd4_encode_create(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_create *create)
1824 {
1825         ENCODE_HEAD;
1826
1827         if (!nfserr) {
1828                 RESERVE_SPACE(32);
1829                 WRITECINFO(create->cr_cinfo);
1830                 WRITE32(2);
1831                 WRITE32(create->cr_bmval[0]);
1832                 WRITE32(create->cr_bmval[1]);
1833                 ADJUST_ARGS();
1834         }
1835 }
1836
1837 static int
1838 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_getattr *getattr)
1839 {
1840         struct svc_fh *fhp = getattr->ga_fhp;
1841         int buflen;
1842
1843         if (nfserr)
1844                 return nfserr;
1845
1846         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
1847         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
1848                                     resp->p, &buflen, getattr->ga_bmval,
1849                                     resp->rqstp);
1850
1851         if (!nfserr)
1852                 resp->p += buflen;
1853         return nfserr;
1854 }
1855
1856 static void
1857 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, int nfserr, struct svc_fh *fhp)
1858 {
1859         unsigned int len;
1860         ENCODE_HEAD;
1861
1862         if (!nfserr) {
1863                 len = fhp->fh_handle.fh_size;
1864                 RESERVE_SPACE(len + 4);
1865                 WRITE32(len);
1866                 WRITEMEM(&fhp->fh_handle.fh_base, len);
1867                 ADJUST_ARGS();
1868         }
1869 }
1870
1871 /*
1872 * Including all fields other than the name, a LOCK4denied structure requires
1873 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
1874 */
1875 static void
1876 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
1877 {
1878         ENCODE_HEAD;
1879
1880         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
1881         WRITE64(ld->ld_start);
1882         WRITE64(ld->ld_length);
1883         WRITE32(ld->ld_type);
1884         if (ld->ld_sop) {
1885                 WRITEMEM(&ld->ld_clientid, 8);
1886                 WRITE32(ld->ld_sop->so_owner.len);
1887                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
1888                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
1889         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
1890                 WRITE64((u64)0); /* clientid */
1891                 WRITE32(0); /* length of owner name */
1892         }
1893         ADJUST_ARGS();
1894 }
1895
1896 static void
1897 nfsd4_encode_lock(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lock *lock)
1898 {
1899         ENCODE_SEQID_OP_HEAD;
1900
1901         if (!nfserr) {
1902                 RESERVE_SPACE(4 + sizeof(stateid_t));
1903                 WRITE32(lock->lk_resp_stateid.si_generation);
1904                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
1905                 ADJUST_ARGS();
1906         } else if (nfserr == nfserr_denied)
1907                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
1908
1909         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
1910 }
1911
1912 static void
1913 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lockt *lockt)
1914 {
1915         if (nfserr == nfserr_denied)
1916                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
1917 }
1918
1919 static void
1920 nfsd4_encode_locku(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_locku *locku)
1921 {
1922         ENCODE_SEQID_OP_HEAD;
1923
1924         if (!nfserr) {
1925                 RESERVE_SPACE(sizeof(stateid_t));
1926                 WRITE32(locku->lu_stateid.si_generation);
1927                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
1928                 ADJUST_ARGS();
1929         }
1930
1931         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
1932 }
1933
1934
1935 static void
1936 nfsd4_encode_link(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_link *link)
1937 {
1938         ENCODE_HEAD;
1939
1940         if (!nfserr) {
1941                 RESERVE_SPACE(20);
1942                 WRITECINFO(link->li_cinfo);
1943                 ADJUST_ARGS();
1944         }
1945 }
1946
1947
1948 static void
1949 nfsd4_encode_open(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open *open)
1950 {
1951         ENCODE_SEQID_OP_HEAD;
1952
1953         if (nfserr)
1954                 goto out;
1955
1956         RESERVE_SPACE(36 + sizeof(stateid_t));
1957         WRITE32(open->op_stateid.si_generation);
1958         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
1959         WRITECINFO(open->op_cinfo);
1960         WRITE32(open->op_rflags);
1961         WRITE32(2);
1962         WRITE32(open->op_bmval[0]);
1963         WRITE32(open->op_bmval[1]);
1964         WRITE32(open->op_delegate_type);
1965         ADJUST_ARGS();
1966
1967         switch (open->op_delegate_type) {
1968         case NFS4_OPEN_DELEGATE_NONE:
1969                 break;
1970         case NFS4_OPEN_DELEGATE_READ:
1971                 RESERVE_SPACE(20 + sizeof(stateid_t));
1972                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
1973                 WRITE32(open->op_recall);
1974
1975                 /*
1976                  * TODO: ACE's in delegations
1977                  */
1978                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
1979                 WRITE32(0);
1980                 WRITE32(0);
1981                 WRITE32(0);   /* XXX: is NULL principal ok? */
1982                 ADJUST_ARGS();
1983                 break;
1984         case NFS4_OPEN_DELEGATE_WRITE:
1985                 RESERVE_SPACE(32 + sizeof(stateid_t));
1986                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
1987                 WRITE32(0);
1988
1989                 /*
1990                  * TODO: space_limit's in delegations
1991                  */
1992                 WRITE32(NFS4_LIMIT_SIZE);
1993                 WRITE32(~(u32)0);
1994                 WRITE32(~(u32)0);
1995
1996                 /*
1997                  * TODO: ACE's in delegations
1998                  */
1999                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2000                 WRITE32(0);
2001                 WRITE32(0);
2002                 WRITE32(0);   /* XXX: is NULL principal ok? */
2003                 ADJUST_ARGS();
2004                 break;
2005         default:
2006                 BUG();
2007         }
2008         /* XXX save filehandle here */
2009 out:
2010         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2011 }
2012
2013 static void
2014 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_confirm *oc)
2015 {
2016         ENCODE_SEQID_OP_HEAD;
2017
2018         if (!nfserr) {
2019                 RESERVE_SPACE(sizeof(stateid_t));
2020                 WRITE32(oc->oc_resp_stateid.si_generation);
2021                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2022                 ADJUST_ARGS();
2023         }
2024
2025         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2026 }
2027
2028 static void
2029 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_downgrade *od)
2030 {
2031         ENCODE_SEQID_OP_HEAD;
2032
2033         if (!nfserr) {
2034                 RESERVE_SPACE(sizeof(stateid_t));
2035                 WRITE32(od->od_stateid.si_generation);
2036                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2037                 ADJUST_ARGS();
2038         }
2039
2040         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2041 }
2042
2043 static int
2044 nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_read *read)
2045 {
2046         u32 eof;
2047         int v, pn;
2048         unsigned long maxcount;
2049         long len;
2050         ENCODE_HEAD;
2051
2052         if (nfserr)
2053                 return nfserr;
2054         if (resp->xbuf->page_len)
2055                 return nfserr_resource;
2056
2057         RESERVE_SPACE(8); /* eof flag and byte count */
2058
2059         maxcount = NFSSVC_MAXBLKSIZE;
2060         if (maxcount > read->rd_length)
2061                 maxcount = read->rd_length;
2062
2063         len = maxcount;
2064         v = 0;
2065         while (len > 0) {
2066                 pn = resp->rqstp->rq_resused;
2067                 svc_take_page(resp->rqstp);
2068                 read->rd_iov[v].iov_base = page_address(resp->rqstp->rq_respages[pn]);
2069                 read->rd_iov[v].iov_len = len < PAGE_SIZE ? len : PAGE_SIZE;
2070                 v++;
2071                 len -= PAGE_SIZE;
2072         }
2073         read->rd_vlen = v;
2074
2075         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2076                         read->rd_offset, read->rd_iov, read->rd_vlen,
2077                         &maxcount);
2078
2079         if (nfserr == nfserr_symlink)
2080                 nfserr = nfserr_inval;
2081         if (nfserr)
2082                 return nfserr;
2083         eof = (read->rd_offset + maxcount >= read->rd_fhp->fh_dentry->d_inode->i_size);
2084
2085         WRITE32(eof);
2086         WRITE32(maxcount);
2087         ADJUST_ARGS();
2088         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2089
2090         resp->xbuf->page_len = maxcount;
2091
2092         /* read zero bytes -> don't set up tail */
2093         if(!maxcount)
2094                 return 0;
2095
2096         /* set up page for remaining responses */
2097         svc_take_page(resp->rqstp);
2098         resp->xbuf->tail[0].iov_base =
2099                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2100         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2101         resp->xbuf->tail[0].iov_len = 0;
2102         resp->p = resp->xbuf->tail[0].iov_base;
2103         resp->end = resp->p + PAGE_SIZE/4;
2104
2105         if (maxcount&3) {
2106                 *(resp->p)++ = 0;
2107                 resp->xbuf->tail[0].iov_base += maxcount&3;
2108                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2109         }
2110         return 0;
2111 }
2112
2113 static int
2114 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readlink *readlink)
2115 {
2116         int maxcount;
2117         char *page;
2118         ENCODE_HEAD;
2119
2120         if (nfserr)
2121                 return nfserr;
2122         if (resp->xbuf->page_len)
2123                 return nfserr_resource;
2124
2125         svc_take_page(resp->rqstp);
2126         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2127
2128         maxcount = PAGE_SIZE;
2129         RESERVE_SPACE(4);
2130
2131         /*
2132          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2133          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2134          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2135          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2136          */
2137         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2138         if (nfserr == nfserr_isdir)
2139                 return nfserr_inval;
2140         if (nfserr)
2141                 return nfserr;
2142
2143         WRITE32(maxcount);
2144         ADJUST_ARGS();
2145         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2146
2147         svc_take_page(resp->rqstp);
2148         resp->xbuf->tail[0].iov_base =
2149                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2150         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2151         resp->xbuf->tail[0].iov_len = 0;
2152         resp->p = resp->xbuf->tail[0].iov_base;
2153         resp->end = resp->p + PAGE_SIZE/4;
2154
2155         resp->xbuf->page_len = maxcount;
2156         if (maxcount&3) {
2157                 *(resp->p)++ = 0;
2158                 resp->xbuf->tail[0].iov_base += maxcount&3;
2159                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2160         }
2161         return 0;
2162 }
2163
2164 static int
2165 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readdir *readdir)
2166 {
2167         int maxcount;
2168         loff_t offset;
2169         u32 *page, *savep;
2170         ENCODE_HEAD;
2171
2172         if (nfserr)
2173                 return nfserr;
2174         if (resp->xbuf->page_len)
2175                 return nfserr_resource;
2176
2177         RESERVE_SPACE(8);  /* verifier */
2178         savep = p;
2179
2180         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2181         WRITE32(0);
2182         WRITE32(0);
2183         ADJUST_ARGS();
2184         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2185
2186         maxcount = PAGE_SIZE;
2187         if (maxcount > readdir->rd_maxcount)
2188                 maxcount = readdir->rd_maxcount;
2189
2190         /*
2191          * Convert from bytes to words, account for the two words already
2192          * written, make sure to leave two words at the end for the next
2193          * pointer and eof field.
2194          */
2195         maxcount = (maxcount >> 2) - 4;
2196         if (maxcount < 0) {
2197                 nfserr =  nfserr_toosmall;
2198                 goto err_no_verf;
2199         }
2200
2201         svc_take_page(resp->rqstp);
2202         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2203         readdir->common.err = 0;
2204         readdir->buflen = maxcount;
2205         readdir->buffer = page;
2206         readdir->offset = NULL;
2207
2208         offset = readdir->rd_cookie;
2209         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2210                               &offset,
2211                               &readdir->common, nfsd4_encode_dirent);
2212         if (nfserr == nfs_ok &&
2213             readdir->common.err == nfserr_toosmall &&
2214             readdir->buffer == page)
2215                 nfserr = nfserr_toosmall;
2216         if (nfserr == nfserr_symlink)
2217                 nfserr = nfserr_notdir;
2218         if (nfserr)
2219                 goto err_no_verf;
2220
2221         if (readdir->offset)
2222                 xdr_encode_hyper(readdir->offset, offset);
2223
2224         p = readdir->buffer;
2225         *p++ = 0;       /* no more entries */
2226         *p++ = htonl(readdir->common.err == nfserr_eof);
2227         resp->xbuf->page_len = ((char*)p) - (char*)page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2228
2229         /* allocate a page for the tail */
2230         svc_take_page(resp->rqstp);
2231         resp->xbuf->tail[0].iov_base =
2232                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2233         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2234         resp->xbuf->tail[0].iov_len = 0;
2235         resp->p = resp->xbuf->tail[0].iov_base;
2236         resp->end = resp->p + PAGE_SIZE/4;
2237
2238         return 0;
2239 err_no_verf:
2240         p = savep;
2241         ADJUST_ARGS();
2242         return nfserr;
2243 }
2244
2245 static void
2246 nfsd4_encode_remove(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_remove *remove)
2247 {
2248         ENCODE_HEAD;
2249
2250         if (!nfserr) {
2251                 RESERVE_SPACE(20);
2252                 WRITECINFO(remove->rm_cinfo);
2253                 ADJUST_ARGS();
2254         }
2255 }
2256
2257 static void
2258 nfsd4_encode_rename(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_rename *rename)
2259 {
2260         ENCODE_HEAD;
2261
2262         if (!nfserr) {
2263                 RESERVE_SPACE(40);
2264                 WRITECINFO(rename->rn_sinfo);
2265                 WRITECINFO(rename->rn_tinfo);
2266                 ADJUST_ARGS();
2267         }
2268 }
2269
2270 /*
2271  * The SETATTR encode routine is special -- it always encodes a bitmap,
2272  * regardless of the error status.
2273  */
2274 static void
2275 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setattr *setattr)
2276 {
2277         ENCODE_HEAD;
2278
2279         RESERVE_SPACE(12);
2280         if (nfserr) {
2281                 WRITE32(2);
2282                 WRITE32(0);
2283                 WRITE32(0);
2284         }
2285         else {
2286                 WRITE32(2);
2287                 WRITE32(setattr->sa_bmval[0]);
2288                 WRITE32(setattr->sa_bmval[1]);
2289         }
2290         ADJUST_ARGS();
2291 }
2292
2293 static void
2294 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setclientid *scd)
2295 {
2296         ENCODE_HEAD;
2297
2298         if (!nfserr) {
2299                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2300                 WRITEMEM(&scd->se_clientid, 8);
2301                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2302                 ADJUST_ARGS();
2303         }
2304         else if (nfserr == nfserr_clid_inuse) {
2305                 RESERVE_SPACE(8);
2306                 WRITE32(0);
2307                 WRITE32(0);
2308                 ADJUST_ARGS();
2309         }
2310 }
2311
2312 static void
2313 nfsd4_encode_write(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_write *write)
2314 {
2315         ENCODE_HEAD;
2316
2317         if (!nfserr) {
2318                 RESERVE_SPACE(16);
2319                 WRITE32(write->wr_bytes_written);
2320                 WRITE32(write->wr_how_written);
2321                 WRITEMEM(write->wr_verifier.data, 8);
2322                 ADJUST_ARGS();
2323         }
2324 }
2325
2326 void
2327 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2328 {
2329         u32 *statp;
2330         ENCODE_HEAD;
2331
2332         RESERVE_SPACE(8);
2333         WRITE32(op->opnum);
2334         statp = p++;    /* to be backfilled at the end */
2335         ADJUST_ARGS();
2336
2337         switch (op->opnum) {
2338         case OP_ACCESS:
2339                 nfsd4_encode_access(resp, op->status, &op->u.access);
2340                 break;
2341         case OP_CLOSE:
2342                 nfsd4_encode_close(resp, op->status, &op->u.close);
2343                 break;
2344         case OP_COMMIT:
2345                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2346                 break;
2347         case OP_CREATE:
2348                 nfsd4_encode_create(resp, op->status, &op->u.create);
2349                 break;
2350         case OP_DELEGRETURN:
2351                 break;
2352         case OP_GETATTR:
2353                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2354                 break;
2355         case OP_GETFH:
2356                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2357                 break;
2358         case OP_LINK:
2359                 nfsd4_encode_link(resp, op->status, &op->u.link);
2360                 break;
2361         case OP_LOCK:
2362                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2363                 break;
2364         case OP_LOCKT:
2365                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2366                 break;
2367         case OP_LOCKU:
2368                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2369                 break;
2370         case OP_LOOKUP:
2371                 break;
2372         case OP_LOOKUPP:
2373                 break;
2374         case OP_NVERIFY:
2375                 break;
2376         case OP_OPEN:
2377                 nfsd4_encode_open(resp, op->status, &op->u.open);
2378                 break;
2379         case OP_OPEN_CONFIRM:
2380                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2381                 break;
2382         case OP_OPEN_DOWNGRADE:
2383                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2384                 break;
2385         case OP_PUTFH:
2386                 break;
2387         case OP_PUTROOTFH:
2388                 break;
2389         case OP_READ:
2390                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2391                 break;
2392         case OP_READDIR:
2393                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2394                 break;
2395         case OP_READLINK:
2396                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2397                 break;
2398         case OP_REMOVE:
2399                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2400                 break;
2401         case OP_RENAME:
2402                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2403                 break;
2404         case OP_RENEW:
2405                 break;
2406         case OP_RESTOREFH:
2407                 break;
2408         case OP_SAVEFH:
2409                 break;
2410         case OP_SETATTR:
2411                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2412                 break;
2413         case OP_SETCLIENTID:
2414                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2415                 break;
2416         case OP_SETCLIENTID_CONFIRM:
2417                 break;
2418         case OP_VERIFY:
2419                 break;
2420         case OP_WRITE:
2421                 nfsd4_encode_write(resp, op->status, &op->u.write);
2422                 break;
2423         case OP_RELEASE_LOCKOWNER:
2424                 break;
2425         default:
2426                 break;
2427         }
2428
2429         /*
2430          * Note: We write the status directly, instead of using WRITE32(),
2431          * since it is already in network byte order.
2432          */
2433         *statp = op->status;
2434 }
2435
2436 /*
2437  * Encode the reply stored in the stateowner reply cache
2438  *
2439  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2440  * previously sent already encoded operation.
2441  *
2442  * called with nfs4_lock_state() held
2443  */
2444 void
2445 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2446 {
2447         ENCODE_HEAD;
2448         struct nfs4_replay *rp = op->replay;
2449
2450         BUG_ON(!rp);
2451
2452         RESERVE_SPACE(8);
2453         WRITE32(op->opnum);
2454         *p++ = rp->rp_status;  /* already xdr'ed */
2455         ADJUST_ARGS();
2456
2457         RESERVE_SPACE(rp->rp_buflen);
2458         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2459         ADJUST_ARGS();
2460 }
2461
2462 /*
2463  * END OF "GENERIC" ENCODE ROUTINES.
2464  */
2465
2466 int
2467 nfs4svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
2468 {
2469         return xdr_ressize_check(rqstp, p);
2470 }
2471
2472 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2473 {
2474         if (args->ops != args->iops) {
2475                 kfree(args->ops);
2476                 args->ops = args->iops;
2477         }
2478         kfree(args->tmpp);
2479         args->tmpp = NULL;
2480         while (args->to_free) {
2481                 struct tmpbuf *tb = args->to_free;
2482                 args->to_free = tb->next;
2483                 tb->release(tb->buf);
2484                 kfree(tb);
2485         }
2486 }
2487
2488 int
2489 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundargs *args)
2490 {
2491         int status;
2492
2493         args->p = p;
2494         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2495         args->pagelist = rqstp->rq_arg.pages;
2496         args->pagelen = rqstp->rq_arg.page_len;
2497         args->tmpp = NULL;
2498         args->to_free = NULL;
2499         args->ops = args->iops;
2500         args->rqstp = rqstp;
2501
2502         status = nfsd4_decode_compound(args);
2503         if (status) {
2504                 nfsd4_release_compoundargs(args);
2505         }
2506         return !status;
2507 }
2508
2509 int
2510 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundres *resp)
2511 {
2512         /*
2513          * All that remains is to write the tag and operation count...
2514          */
2515         struct kvec *iov;
2516         p = resp->tagp;
2517         *p++ = htonl(resp->taglen);
2518         memcpy(p, resp->tag, resp->taglen);
2519         p += XDR_QUADLEN(resp->taglen);
2520         *p++ = htonl(resp->opcnt);
2521
2522         if (rqstp->rq_res.page_len)
2523                 iov = &rqstp->rq_res.tail[0];
2524         else
2525                 iov = &rqstp->rq_res.head[0];
2526         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2527         BUG_ON(iov->iov_len > PAGE_SIZE);
2528         return 1;
2529 }
2530
2531 /*
2532  * Local variables:
2533  *  c-basic-offset: 8
2534  * End:
2535  */