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   1 /*
   2  *  fs/nfs/nfs4xdr.c
   3  *
   4  *  Server-side XDR for NFSv4
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * TODO: Neil Brown made the following observation:  We currently
  38  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  39  * never release any of that until the request is complete.
  40  * It would be good to calculate a new maximum response size while
  41  * decoding the COMPOUND, and call svc_reserve with this number
  42  * at the end of nfs4svc_decode_compoundargs.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/smp.h>
  47 #include <linux/fs.h>
  48 #include <linux/namei.h>
  49 #include <linux/vfs.h>
  50 #include <linux/sunrpc/xdr.h>
  51 #include <linux/sunrpc/svc.h>
  52 #include <linux/sunrpc/clnt.h>
  53 #include <linux/nfsd/nfsd.h>
  54 #include <linux/nfsd/state.h>
  55 #include <linux/nfsd/xdr4.h>
  56 #include <linux/nfsd_idmap.h>
  57 #include <linux/nfs4.h>
  58 #include <linux/nfs4_acl.h>
  59 #include <linux/sunrpc/gss_api.h>
  60 #include <linux/sunrpc/svcauth_gss.h>
  61
  62 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  63
  64 /*
  65  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  66  * directory in order to indicate to the client that a filesystem boundary is present
  67  * We use a fixed fsid for a referral
  68  */
  69 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  70 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  71
  72 static __be32
  73 check_filename(char *str, int len, __be32 err)
  74 {
  75         int i;
  76
  77         if (len == 0)
  78                 return nfserr_inval;
  79         if (isdotent(str, len))
  80                 return err;
  81         for (i = 0; i < len; i++)
  82                 if (str[i] == '/')
  83                         return err;
  84         return 0;
  85 }
  86
  87 /*
  88  * START OF "GENERIC" DECODE ROUTINES.
  89  *   These may look a little ugly since they are imported from a "generic"
  90  * set of XDR encode/decode routines which are intended to be shared by
  91  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  92  *
  93  * If the pain of reading these is too great, it should be a straightforward
  94  * task to translate them into Linux-specific versions which are more
  95  * consistent with the style used in NFSv2/v3...
  96  */
  97 #define DECODE_HEAD                             \
  98         __be32 *p;                              \
  99         __be32 status
 100 #define DECODE_TAIL                             \
 101         status = 0;                             \
 102 out:                                            \
 103         return status;                          \
 104 xdr_error:                                      \
 105         dprintk("NFSD: xdr error (%s:%d)\n",    \
 106                         __FILE__, __LINE__);    \
 107         status = nfserr_bad_xdr;                \
 108         goto out
 109
 110 #define READ32(x)         (x) = ntohl(*p++)
 111 #define READ64(x)         do {                  \
 112         (x) = (u64)ntohl(*p++) << 32;           \
 113         (x) |= ntohl(*p++);                     \
 114 } while (0)
 115 #define READTIME(x)       do {                  \
 116         p++;                                    \
 117         (x) = ntohl(*p++);                      \
 118         p++;                                    \
 119 } while (0)
 120 #define READMEM(x,nbytes) do {                  \
 121         x = (char *)p;                          \
 122         p += XDR_QUADLEN(nbytes);               \
 123 } while (0)
 124 #define SAVEMEM(x,nbytes) do {                  \
 125         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 126                 savemem(argp, p, nbytes) :      \
 127                 (char *)p)) {                   \
 128                 dprintk("NFSD: xdr error (%s:%d)\n", \
 129                                 __FILE__, __LINE__); \
 130                 goto xdr_error;                 \
 131                 }                               \
 132         p += XDR_QUADLEN(nbytes);               \
 133 } while (0)
 134 #define COPYMEM(x,nbytes) do {                  \
 135         memcpy((x), p, nbytes);                 \
 136         p += XDR_QUADLEN(nbytes);               \
 137 } while (0)
 138
 139 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 140 #define READ_BUF(nbytes)  do {                  \
 141         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 142                 p = argp->p;                    \
 143                 argp->p += XDR_QUADLEN(nbytes); \
 144         } else if (!(p = read_buf(argp, nbytes))) { \
 145                 dprintk("NFSD: xdr error (%s:%d)\n", \
 146                                 __FILE__, __LINE__); \
 147                 goto xdr_error;                 \
 148         }                                       \
 149 } while (0)
 150
 151 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 152 {
 153         /* We want more bytes than seem to be available.
 154          * Maybe we need a new page, maybe we have just run out
 155          */
 156         unsigned int avail = (char *)argp->end - (char *)argp->p;
 157         __be32 *p;
 158         if (avail + argp->pagelen < nbytes)
 159                 return NULL;
 160         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 161                 return NULL;
 162         /* ok, we can do it with the current plus the next page */
 163         if (nbytes <= sizeof(argp->tmp))
 164                 p = argp->tmp;
 165         else {
 166                 kfree(argp->tmpp);
 167                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 168                 if (!p)
 169                         return NULL;
 170
 171         }
 172         /*
 173          * The following memcpy is safe because read_buf is always
 174          * called with nbytes > avail, and the two cases above both
 175          * guarantee p points to at least nbytes bytes.
 176          */
 177         memcpy(p, argp->p, avail);
 178         /* step to next page */
 179         argp->p = page_address(argp->pagelist[0]);
 180         argp->pagelist++;
 181         if (argp->pagelen < PAGE_SIZE) {
 182                 argp->end = p + (argp->pagelen>>2);
 183                 argp->pagelen = 0;
 184         } else {
 185                 argp->end = p + (PAGE_SIZE>>2);
 186                 argp->pagelen -= PAGE_SIZE;
 187         }
 188         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 189         argp->p += XDR_QUADLEN(nbytes - avail);
 190         return p;
 191 }
 192
 193 static int
 194 defer_free(struct nfsd4_compoundargs *argp,
 195                 void (*release)(const void *), void *p)
 196 {
 197         struct tmpbuf *tb;
 198
 199         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 200         if (!tb)
 201                 return -ENOMEM;
 202         tb->buf = p;
 203         tb->release = release;
 204         tb->next = argp->to_free;
 205         argp->to_free = tb;
 206         return 0;
 207 }
 208
 209 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 210 {
 211         if (p == argp->tmp) {
 212                 p = kmalloc(nbytes, GFP_KERNEL);
 213                 if (!p)
 214                         return NULL;
 215                 memcpy(p, argp->tmp, nbytes);
 216         } else {
 217                 BUG_ON(p != argp->tmpp);
 218                 argp->tmpp = NULL;
 219         }
 220         if (defer_free(argp, kfree, p)) {
 221                 kfree(p);
 222                 return NULL;
 223         } else
 224                 return (char *)p;
 225 }
 226
 227 static __be32
 228 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 229 {
 230         u32 bmlen;
 231         DECODE_HEAD;
 232
 233         bmval[0] = 0;
 234         bmval[1] = 0;
 235
 236         READ_BUF(4);
 237         READ32(bmlen);
 238         if (bmlen > 1000)
 239                 goto xdr_error;
 240
 241         READ_BUF(bmlen << 2);
 242         if (bmlen > 0)
 243                 READ32(bmval[0]);
 244         if (bmlen > 1)
 245                 READ32(bmval[1]);
 246
 247         DECODE_TAIL;
 248 }
 249
 250 static __be32
 251 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 252     struct nfs4_acl **acl)
 253 {
 254         int expected_len, len = 0;
 255         u32 dummy32;
 256         char *buf;
 257         int host_err;
 258
 259         DECODE_HEAD;
 260         iattr->ia_valid = 0;
 261         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 262                 return status;
 263
 264         /*
 265          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
 266          * read-only attributes return ERR_INVAL.
 267          */
 268         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 269                 return nfserr_attrnotsupp;
 270         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 271                 return nfserr_inval;
 272
 273         READ_BUF(4);
 274         READ32(expected_len);
 275
 276         if (bmval[0] & FATTR4_WORD0_SIZE) {
 277                 READ_BUF(8);
 278                 len += 8;
 279                 READ64(iattr->ia_size);
 280                 iattr->ia_valid |= ATTR_SIZE;
 281         }
 282         if (bmval[0] & FATTR4_WORD0_ACL) {
 283                 int nace;
 284                 struct nfs4_ace *ace;
 285
 286                 READ_BUF(4); len += 4;
 287                 READ32(nace);
 288
 289                 if (nace > NFS4_ACL_MAX)
 290                         return nfserr_resource;
 291
 292                 *acl = nfs4_acl_new(nace);
 293                 if (*acl == NULL) {
 294                         host_err = -ENOMEM;
 295                         goto out_nfserr;
 296                 }
 297                 defer_free(argp, kfree, *acl);
 298
 299                 (*acl)->naces = nace;
 300                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 301                         READ_BUF(16); len += 16;
 302                         READ32(ace->type);
 303                         READ32(ace->flag);
 304                         READ32(ace->access_mask);
 305                         READ32(dummy32);
 306                         READ_BUF(dummy32);
 307                         len += XDR_QUADLEN(dummy32) << 2;
 308                         READMEM(buf, dummy32);
 309                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 310                         host_err = 0;
 311                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 312                                 ace->who = 0;
 313                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 314                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 315                                                 buf, dummy32, &ace->who);
 316                         else
 317                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 318                                                 buf, dummy32, &ace->who);
 319                         if (host_err)
 320                                 goto out_nfserr;
 321                 }
 322         } else
 323                 *acl = NULL;
 324         if (bmval[1] & FATTR4_WORD1_MODE) {
 325                 READ_BUF(4);
 326                 len += 4;
 327                 READ32(iattr->ia_mode);
 328                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 329                 iattr->ia_valid |= ATTR_MODE;
 330         }
 331         if (bmval[1] & FATTR4_WORD1_OWNER) {
 332                 READ_BUF(4);
 333                 len += 4;
 334                 READ32(dummy32);
 335                 READ_BUF(dummy32);
 336                 len += (XDR_QUADLEN(dummy32) << 2);
 337                 READMEM(buf, dummy32);
 338                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 339                         goto out_nfserr;
 340                 iattr->ia_valid |= ATTR_UID;
 341         }
 342         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 343                 READ_BUF(4);
 344                 len += 4;
 345                 READ32(dummy32);
 346                 READ_BUF(dummy32);
 347                 len += (XDR_QUADLEN(dummy32) << 2);
 348                 READMEM(buf, dummy32);
 349                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 350                         goto out_nfserr;
 351                 iattr->ia_valid |= ATTR_GID;
 352         }
 353         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 354                 READ_BUF(4);
 355                 len += 4;
 356                 READ32(dummy32);
 357                 switch (dummy32) {
 358                 case NFS4_SET_TO_CLIENT_TIME:
 359                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 360                            all 32 bits of 'nseconds'. */
 361                         READ_BUF(12);
 362                         len += 12;
 363                         READ32(dummy32);
 364                         if (dummy32)
 365                                 return nfserr_inval;
 366                         READ32(iattr->ia_atime.tv_sec);
 367                         READ32(iattr->ia_atime.tv_nsec);
 368                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 369                                 return nfserr_inval;
 370                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 371                         break;
 372                 case NFS4_SET_TO_SERVER_TIME:
 373                         iattr->ia_valid |= ATTR_ATIME;
 374                         break;
 375                 default:
 376                         goto xdr_error;
 377                 }
 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(host_err);
 412         goto out;
 413 }
 414
 415 static __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 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 __be32
 818 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 819                      struct nfsd4_secinfo *secinfo)
 820 {
 821         DECODE_HEAD;
 822
 823         READ_BUF(4);
 824         READ32(secinfo->si_namelen);
 825         READ_BUF(secinfo->si_namelen);
 826         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 827         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 828                                                                 nfserr_noent);
 829         if (status)
 830                 return status;
 831         DECODE_TAIL;
 832 }
 833
 834 static __be32
 835 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 836 {
 837         DECODE_HEAD;
 838
 839         READ_BUF(sizeof(stateid_t));
 840         READ32(setattr->sa_stateid.si_generation);
 841         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 842         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 843                 goto out;
 844
 845         DECODE_TAIL;
 846 }
 847
 848 static __be32
 849 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 850 {
 851         DECODE_HEAD;
 852
 853         READ_BUF(12);
 854         COPYMEM(setclientid->se_verf.data, 8);
 855         READ32(setclientid->se_namelen);
 856
 857         READ_BUF(setclientid->se_namelen + 8);
 858         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 859         READ32(setclientid->se_callback_prog);
 860         READ32(setclientid->se_callback_netid_len);
 861
 862         READ_BUF(setclientid->se_callback_netid_len + 4);
 863         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 864         READ32(setclientid->se_callback_addr_len);
 865
 866         READ_BUF(setclientid->se_callback_addr_len + 4);
 867         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 868         READ32(setclientid->se_callback_ident);
 869
 870         DECODE_TAIL;
 871 }
 872
 873 static __be32
 874 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 875 {
 876         DECODE_HEAD;
 877
 878         READ_BUF(8 + sizeof(nfs4_verifier));
 879         COPYMEM(&scd_c->sc_clientid, 8);
 880         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 881
 882         DECODE_TAIL;
 883 }
 884
 885 /* Also used for NVERIFY */
 886 static __be32
 887 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 888 {
 889 #if 0
 890         struct nfsd4_compoundargs save = {
 891                 .p = argp->p,
 892                 .end = argp->end,
 893                 .rqstp = argp->rqstp,
 894         };
 895         u32             ve_bmval[2];
 896         struct iattr    ve_iattr;           /* request */
 897         struct nfs4_acl *ve_acl;            /* request */
 898 #endif
 899         DECODE_HEAD;
 900
 901         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 902                 goto out;
 903
 904         /* For convenience's sake, we compare raw xdr'd attributes in
 905          * nfsd4_proc_verify; however we still decode here just to return
 906          * correct error in case of bad xdr. */
 907 #if 0
 908         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 909         if (status == nfserr_inval) {
 910                 status = nfserrno(status);
 911                 goto out;
 912         }
 913 #endif
 914         READ_BUF(4);
 915         READ32(verify->ve_attrlen);
 916         READ_BUF(verify->ve_attrlen);
 917         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 918
 919         DECODE_TAIL;
 920 }
 921
 922 static __be32
 923 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 924 {
 925         int avail;
 926         int v;
 927         int len;
 928         DECODE_HEAD;
 929
 930         READ_BUF(sizeof(stateid_opaque_t) + 20);
 931         READ32(write->wr_stateid.si_generation);
 932         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
 933         READ64(write->wr_offset);
 934         READ32(write->wr_stable_how);
 935         if (write->wr_stable_how > 2)
 936                 goto xdr_error;
 937         READ32(write->wr_buflen);
 938
 939         /* Sorry .. no magic macros for this.. *
 940          * READ_BUF(write->wr_buflen);
 941          * SAVEMEM(write->wr_buf, write->wr_buflen);
 942          */
 943         avail = (char*)argp->end - (char*)argp->p;
 944         if (avail + argp->pagelen < write->wr_buflen) {
 945                 dprintk("NFSD: xdr error (%s:%d)\n",
 946                                 __FILE__, __LINE__);
 947                 goto xdr_error;
 948         }
 949         argp->rqstp->rq_vec[0].iov_base = p;
 950         argp->rqstp->rq_vec[0].iov_len = avail;
 951         v = 0;
 952         len = write->wr_buflen;
 953         while (len > argp->rqstp->rq_vec[v].iov_len) {
 954                 len -= argp->rqstp->rq_vec[v].iov_len;
 955                 v++;
 956                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 957                 argp->pagelist++;
 958                 if (argp->pagelen >= PAGE_SIZE) {
 959                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 960                         argp->pagelen -= PAGE_SIZE;
 961                 } else {
 962                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 963                         argp->pagelen -= len;
 964                 }
 965         }
 966         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 967         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 968         argp->rqstp->rq_vec[v].iov_len = len;
 969         write->wr_vlen = v+1;
 970
 971         DECODE_TAIL;
 972 }
 973
 974 static __be32
 975 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 976 {
 977         DECODE_HEAD;
 978
 979         READ_BUF(12);
 980         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 981         READ32(rlockowner->rl_owner.len);
 982         READ_BUF(rlockowner->rl_owner.len);
 983         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 984
 985         DECODE_TAIL;
 986 }
 987
 988 static __be32
 989 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 990 {
 991         DECODE_HEAD;
 992         struct nfsd4_op *op;
 993         int i;
 994
 995         /*
 996          * XXX: According to spec, we should check the tag
 997          * for UTF-8 compliance.  I'm postponing this for
 998          * now because it seems that some clients do use
 999          * binary tags.
1000          */
1001         READ_BUF(4);
1002         READ32(argp->taglen);
1003         READ_BUF(argp->taglen + 8);
1004         SAVEMEM(argp->tag, argp->taglen);
1005         READ32(argp->minorversion);
1006         READ32(argp->opcnt);
1007
1008         if (argp->taglen > NFSD4_MAX_TAGLEN)
1009                 goto xdr_error;
1010         if (argp->opcnt > 100)
1011                 goto xdr_error;
1012
1013         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1014                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1015                 if (!argp->ops) {
1016                         argp->ops = argp->iops;
1017                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1018                         goto xdr_error;
1019                 }
1020         }
1021
1022         if (argp->minorversion != 0)
1023                 argp->opcnt = 0;
1024
1025         for (i = 0; i < argp->opcnt; i++) {
1026                 op = &argp->ops[i];
1027                 op->replay = NULL;
1028
1029                 /*
1030                  * We can't use READ_BUF() here because we need to handle
1031                  * a missing opcode as an OP_WRITE + 1. So we need to check
1032                  * to see if we're truly at the end of our buffer or if there
1033                  * is another page we need to flip to.
1034                  */
1035
1036                 if (argp->p == argp->end) {
1037                         if (argp->pagelen < 4) {
1038                                 /* There isn't an opcode still on the wire */
1039                                 op->opnum = OP_WRITE + 1;
1040                                 op->status = nfserr_bad_xdr;
1041                                 argp->opcnt = i+1;
1042                                 break;
1043                         }
1044
1045                         /*
1046                          * False alarm. We just hit a page boundary, but there
1047                          * is still data available.  Move pointer across page
1048                          * boundary.  *snip from READ_BUF*
1049                          */
1050                         argp->p = page_address(argp->pagelist[0]);
1051                         argp->pagelist++;
1052                         if (argp->pagelen < PAGE_SIZE) {
1053                                 argp->end = p + (argp->pagelen>>2);
1054                                 argp->pagelen = 0;
1055                         } else {
1056                                 argp->end = p + (PAGE_SIZE>>2);
1057                                 argp->pagelen -= PAGE_SIZE;
1058                         }
1059                 }
1060                 op->opnum = ntohl(*argp->p++);
1061
1062                 switch (op->opnum) {
1063                 case OP_ACCESS:
1064                         op->status = nfsd4_decode_access(argp, &op->u.access);
1065                         break;
1066                 case OP_CLOSE:
1067                         op->status = nfsd4_decode_close(argp, &op->u.close);
1068                         break;
1069                 case OP_COMMIT:
1070                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1071                         break;
1072                 case OP_CREATE:
1073                         op->status = nfsd4_decode_create(argp, &op->u.create);
1074                         break;
1075                 case OP_DELEGRETURN:
1076                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1077                         break;
1078                 case OP_GETATTR:
1079                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1080                         break;
1081                 case OP_GETFH:
1082                         op->status = nfs_ok;
1083                         break;
1084                 case OP_LINK:
1085                         op->status = nfsd4_decode_link(argp, &op->u.link);
1086                         break;
1087                 case OP_LOCK:
1088                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1089                         break;
1090                 case OP_LOCKT:
1091                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1092                         break;
1093                 case OP_LOCKU:
1094                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1095                         break;
1096                 case OP_LOOKUP:
1097                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1098                         break;
1099                 case OP_LOOKUPP:
1100                         op->status = nfs_ok;
1101                         break;
1102                 case OP_NVERIFY:
1103                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1104                         break;
1105                 case OP_OPEN:
1106                         op->status = nfsd4_decode_open(argp, &op->u.open);
1107                         break;
1108                 case OP_OPEN_CONFIRM:
1109                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1110                         break;
1111                 case OP_OPEN_DOWNGRADE:
1112                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1113                         break;
1114                 case OP_PUTFH:
1115                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1116                         break;
1117                 case OP_PUTROOTFH:
1118                         op->status = nfs_ok;
1119                         break;
1120                 case OP_READ:
1121                         op->status = nfsd4_decode_read(argp, &op->u.read);
1122                         break;
1123                 case OP_READDIR:
1124                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1125                         break;
1126                 case OP_READLINK:
1127                         op->status = nfs_ok;
1128                         break;
1129                 case OP_REMOVE:
1130                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1131                         break;
1132                 case OP_RENAME:
1133                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1134                         break;
1135                 case OP_RESTOREFH:
1136                         op->status = nfs_ok;
1137                         break;
1138                 case OP_RENEW:
1139                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1140                         break;
1141                 case OP_SAVEFH:
1142                         op->status = nfs_ok;
1143                         break;
1144                 case OP_SECINFO:
1145                         op->status = nfsd4_decode_secinfo(argp, &op->u.secinfo);
1146                         break;
1147                 case OP_SETATTR:
1148                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1149                         break;
1150                 case OP_SETCLIENTID:
1151                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1152                         break;
1153                 case OP_SETCLIENTID_CONFIRM:
1154                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1155                         break;
1156                 case OP_VERIFY:
1157                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1158                         break;
1159                 case OP_WRITE:
1160                         op->status = nfsd4_decode_write(argp, &op->u.write);
1161                         break;
1162                 case OP_RELEASE_LOCKOWNER:
1163                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1164                         break;
1165                 default:
1166                         op->opnum = OP_ILLEGAL;
1167                         op->status = nfserr_op_illegal;
1168                         break;
1169                 }
1170
1171                 if (op->status) {
1172                         argp->opcnt = i+1;
1173                         break;
1174                 }
1175         }
1176
1177         DECODE_TAIL;
1178 }
1179 /*
1180  * END OF "GENERIC" DECODE ROUTINES.
1181  */
1182
1183 /*
1184  * START OF "GENERIC" ENCODE ROUTINES.
1185  *   These may look a little ugly since they are imported from a "generic"
1186  * set of XDR encode/decode routines which are intended to be shared by
1187  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1188  *
1189  * If the pain of reading these is too great, it should be a straightforward
1190  * task to translate them into Linux-specific versions which are more
1191  * consistent with the style used in NFSv2/v3...
1192  */
1193 #define ENCODE_HEAD              __be32 *p
1194
1195 #define WRITE32(n)               *p++ = htonl(n)
1196 #define WRITE64(n)               do {                           \
1197         *p++ = htonl((u32)((n) >> 32));                         \
1198         *p++ = htonl((u32)(n));                                 \
1199 } while (0)
1200 #define WRITEMEM(ptr,nbytes)     do if (nbytes > 0) {           \
1201         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1202         memcpy(p, ptr, nbytes);                                 \
1203         p += XDR_QUADLEN(nbytes);                               \
1204 } while (0)
1205 #define WRITECINFO(c)           do {                            \
1206         *p++ = htonl(c.atomic);                                 \
1207         *p++ = htonl(c.before_ctime_sec);                               \
1208         *p++ = htonl(c.before_ctime_nsec);                              \
1209         *p++ = htonl(c.after_ctime_sec);                                \
1210         *p++ = htonl(c.after_ctime_nsec);                               \
1211 } while (0)
1212
1213 #define RESERVE_SPACE(nbytes)   do {                            \
1214         p = resp->p;                                            \
1215         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1216 } while (0)
1217 #define ADJUST_ARGS()           resp->p = p
1218
1219 /*
1220  * Header routine to setup seqid operation replay cache
1221  */
1222 #define ENCODE_SEQID_OP_HEAD                                    \
1223         __be32 *p;                                              \
1224         __be32 *save;                                           \
1225                                                                 \
1226         save = resp->p;
1227
1228 /*
1229  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1230  * is where sequence id's are incremented, and the replay cache is filled.
1231  * Note that we increment sequence id's here, at the last moment, so we're sure
1232  * we know whether the error to be returned is a sequence id mutating error.
1233  */
1234
1235 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1236         if (seqid_mutating_err(nfserr) && stateowner) {         \
1237                 stateowner->so_seqid++;                         \
1238                 stateowner->so_replay.rp_status = nfserr;       \
1239                 stateowner->so_replay.rp_buflen =               \
1240                           (((char *)(resp)->p - (char *)save)); \
1241                 memcpy(stateowner->so_replay.rp_buf, save,      \
1242                         stateowner->so_replay.rp_buflen);       \
1243         } } while (0);
1244
1245 /* Encode as an array of strings the string given with components
1246  * seperated @sep.
1247  */
1248 static __be32 nfsd4_encode_components(char sep, char *components,
1249                                    __be32 **pp, int *buflen)
1250 {
1251         __be32 *p = *pp;
1252         __be32 *countp = p;
1253         int strlen, count=0;
1254         char *str, *end;
1255
1256         dprintk("nfsd4_encode_components(%s)\n", components);
1257         if ((*buflen -= 4) < 0)
1258                 return nfserr_resource;
1259         WRITE32(0); /* We will fill this in with @count later */
1260         end = str = components;
1261         while (*end) {
1262                 for (; *end && (*end != sep); end++)
1263                         ; /* Point to end of component */
1264                 strlen = end - str;
1265                 if (strlen) {
1266                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1267                                 return nfserr_resource;
1268                         WRITE32(strlen);
1269                         WRITEMEM(str, strlen);
1270                         count++;
1271                 }
1272                 else
1273                         end++;
1274                 str = end;
1275         }
1276         *pp = p;
1277         p = countp;
1278         WRITE32(count);
1279         return 0;
1280 }
1281
1282 /*
1283  * encode a location element of a fs_locations structure
1284  */
1285 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1286                                     __be32 **pp, int *buflen)
1287 {
1288         __be32 status;
1289         __be32 *p = *pp;
1290
1291         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1292         if (status)
1293                 return status;
1294         status = nfsd4_encode_components('/', location->path, &p, buflen);
1295         if (status)
1296                 return status;
1297         *pp = p;
1298         return 0;
1299 }
1300
1301 /*
1302  * Return the path to an export point in the pseudo filesystem namespace
1303  * Returned string is safe to use as long as the caller holds a reference
1304  * to @exp.
1305  */
1306 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1307 {
1308         struct svc_fh tmp_fh;
1309         char *path, *rootpath;
1310
1311         fh_init(&tmp_fh, NFS4_FHSIZE);
1312         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1313         if (*stat)
1314                 return NULL;
1315         rootpath = tmp_fh.fh_export->ex_pathname;
1316
1317         path = exp->ex_pathname;
1318
1319         if (strncmp(path, rootpath, strlen(rootpath))) {
1320                 dprintk("nfsd: fs_locations failed;"
1321                         "%s is not contained in %s\n", path, rootpath);
1322                 *stat = nfserr_notsupp;
1323                 return NULL;
1324         }
1325
1326         return path + strlen(rootpath);
1327 }
1328
1329 /*
1330  *  encode a fs_locations structure
1331  */
1332 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1333                                      struct svc_export *exp,
1334                                      __be32 **pp, int *buflen)
1335 {
1336         __be32 status;
1337         int i;
1338         __be32 *p = *pp;
1339         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1340         char *root = nfsd4_path(rqstp, exp, &status);
1341
1342         if (status)
1343                 return status;
1344         status = nfsd4_encode_components('/', root, &p, buflen);
1345         if (status)
1346                 return status;
1347         if ((*buflen -= 4) < 0)
1348                 return nfserr_resource;
1349         WRITE32(fslocs->locations_count);
1350         for (i=0; i<fslocs->locations_count; i++) {
1351                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1352                                                    &p, buflen);
1353                 if (status)
1354                         return status;
1355         }
1356         *pp = p;
1357         return 0;
1358 }
1359
1360 static u32 nfs4_ftypes[16] = {
1361         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1362         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1363         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1364         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1365 };
1366
1367 static __be32
1368 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1369                         __be32 **p, int *buflen)
1370 {
1371         int status;
1372
1373         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1374                 return nfserr_resource;
1375         if (whotype != NFS4_ACL_WHO_NAMED)
1376                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1377         else if (group)
1378                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1379         else
1380                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1381         if (status < 0)
1382                 return nfserrno(status);
1383         *p = xdr_encode_opaque(*p, NULL, status);
1384         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1385         BUG_ON(*buflen < 0);
1386         return 0;
1387 }
1388
1389 static inline __be32
1390 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1391 {
1392         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1393 }
1394
1395 static inline __be32
1396 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1397 {
1398         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1399 }
1400
1401 static inline __be32
1402 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1403                 __be32 **p, int *buflen)
1404 {
1405         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1406 }
1407
1408 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1409                               FATTR4_WORD0_RDATTR_ERROR)
1410 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1411
1412 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1413 {
1414         /* As per referral draft:  */
1415         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1416             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1417                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1418                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1419                         *rdattr_err = NFSERR_MOVED;
1420                 else
1421                         return nfserr_moved;
1422         }
1423         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1424         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1425         return 0;
1426 }
1427
1428 /*
1429  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1430  * ourselves.
1431  *
1432  * @countp is the buffer size in _words_; upon successful return this becomes
1433  * replaced with the number of words written.
1434  */
1435 __be32
1436 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1437                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1438                 struct svc_rqst *rqstp, int ignore_crossmnt)
1439 {
1440         u32 bmval0 = bmval[0];
1441         u32 bmval1 = bmval[1];
1442         struct kstat stat;
1443         struct svc_fh tempfh;
1444         struct kstatfs statfs;
1445         int buflen = *countp << 2;
1446         __be32 *attrlenp;
1447         u32 dummy;
1448         u64 dummy64;
1449         u32 rdattr_err = 0;
1450         __be32 *p = buffer;
1451         __be32 status;
1452         int err;
1453         int aclsupport = 0;
1454         struct nfs4_acl *acl = NULL;
1455
1456         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1457         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1458         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1459
1460         if (exp->ex_fslocs.migrated) {
1461                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1462                 if (status)
1463                         goto out;
1464         }
1465
1466         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1467         if (err)
1468                 goto out_nfserr;
1469         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1470                         FATTR4_WORD0_MAXNAME)) ||
1471             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1472                        FATTR4_WORD1_SPACE_TOTAL))) {
1473                 err = vfs_statfs(dentry, &statfs);
1474                 if (err)
1475                         goto out_nfserr;
1476         }
1477         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1478                 fh_init(&tempfh, NFS4_FHSIZE);
1479                 status = fh_compose(&tempfh, exp, dentry, NULL);
1480                 if (status)
1481                         goto out;
1482                 fhp = &tempfh;
1483         }
1484         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1485                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1486                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1487                 aclsupport = (err == 0);
1488                 if (bmval0 & FATTR4_WORD0_ACL) {
1489                         if (err == -EOPNOTSUPP)
1490                                 bmval0 &= ~FATTR4_WORD0_ACL;
1491                         else if (err == -EINVAL) {
1492                                 status = nfserr_attrnotsupp;
1493                                 goto out;
1494                         } else if (err != 0)
1495                                 goto out_nfserr;
1496                 }
1497         }
1498         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1499                 if (exp->ex_fslocs.locations == NULL) {
1500                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1501                 }
1502         }
1503         if ((buflen -= 16) < 0)
1504                 goto out_resource;
1505
1506         WRITE32(2);
1507         WRITE32(bmval0);
1508         WRITE32(bmval1);
1509         attrlenp = p++;                /* to be backfilled later */
1510
1511         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1512                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1513                 if ((buflen -= 12) < 0)
1514                         goto out_resource;
1515                 if (!aclsupport)
1516                         word0 &= ~FATTR4_WORD0_ACL;
1517                 if (!exp->ex_fslocs.locations)
1518                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1519                 WRITE32(2);
1520                 WRITE32(word0);
1521                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1522         }
1523         if (bmval0 & FATTR4_WORD0_TYPE) {
1524                 if ((buflen -= 4) < 0)
1525                         goto out_resource;
1526                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1527                 if (dummy == NF4BAD)
1528                         goto out_serverfault;
1529                 WRITE32(dummy);
1530         }
1531         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1532                 if ((buflen -= 4) < 0)
1533                         goto out_resource;
1534                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1535                         WRITE32(NFS4_FH_PERSISTENT);
1536                 else
1537                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1538         }
1539         if (bmval0 & FATTR4_WORD0_CHANGE) {
1540                 /*
1541                  * Note: This _must_ be consistent with the scheme for writing
1542                  * change_info, so any changes made here must be reflected there
1543                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1544                  * macro above.)
1545                  */
1546                 if ((buflen -= 8) < 0)
1547                         goto out_resource;
1548                 WRITE32(stat.ctime.tv_sec);
1549                 WRITE32(stat.ctime.tv_nsec);
1550         }
1551         if (bmval0 & FATTR4_WORD0_SIZE) {
1552                 if ((buflen -= 8) < 0)
1553                         goto out_resource;
1554                 WRITE64(stat.size);
1555         }
1556         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1557                 if ((buflen -= 4) < 0)
1558                         goto out_resource;
1559                 WRITE32(1);
1560         }
1561         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1562                 if ((buflen -= 4) < 0)
1563                         goto out_resource;
1564                 WRITE32(1);
1565         }
1566         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1567                 if ((buflen -= 4) < 0)
1568                         goto out_resource;
1569                 WRITE32(0);
1570         }
1571         if (bmval0 & FATTR4_WORD0_FSID) {
1572                 if ((buflen -= 16) < 0)
1573                         goto out_resource;
1574                 if (exp->ex_fslocs.migrated) {
1575                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1576                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1577                 } else switch(fsid_source(fhp)) {
1578                 case FSIDSOURCE_FSID:
1579                         WRITE64((u64)exp->ex_fsid);
1580                         WRITE64((u64)0);
1581                         break;
1582                 case FSIDSOURCE_DEV:
1583                         WRITE32(0);
1584                         WRITE32(MAJOR(stat.dev));
1585                         WRITE32(0);
1586                         WRITE32(MINOR(stat.dev));
1587                         break;
1588                 case FSIDSOURCE_UUID:
1589                         WRITEMEM(exp->ex_uuid, 16);
1590                         break;
1591                 }
1592         }
1593         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1594                 if ((buflen -= 4) < 0)
1595                         goto out_resource;
1596                 WRITE32(0);
1597         }
1598         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1599                 if ((buflen -= 4) < 0)
1600                         goto out_resource;
1601                 WRITE32(NFSD_LEASE_TIME);
1602         }
1603         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1604                 if ((buflen -= 4) < 0)
1605                         goto out_resource;
1606                 WRITE32(rdattr_err);
1607         }
1608         if (bmval0 & FATTR4_WORD0_ACL) {
1609                 struct nfs4_ace *ace;
1610
1611                 if (acl == NULL) {
1612                         if ((buflen -= 4) < 0)
1613                                 goto out_resource;
1614
1615                         WRITE32(0);
1616                         goto out_acl;
1617                 }
1618                 if ((buflen -= 4) < 0)
1619                         goto out_resource;
1620                 WRITE32(acl->naces);
1621
1622                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1623                         if ((buflen -= 4*3) < 0)
1624                                 goto out_resource;
1625                         WRITE32(ace->type);
1626                         WRITE32(ace->flag);
1627                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1628                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1629                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1630                                 &p, &buflen);
1631                         if (status == nfserr_resource)
1632                                 goto out_resource;
1633                         if (status)
1634                                 goto out;
1635                 }
1636         }
1637 out_acl:
1638         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1639                 if ((buflen -= 4) < 0)
1640                         goto out_resource;
1641                 WRITE32(aclsupport ?
1642                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1643         }
1644         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1645                 if ((buflen -= 4) < 0)
1646                         goto out_resource;
1647                 WRITE32(1);
1648         }
1649         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1650                 if ((buflen -= 4) < 0)
1651                         goto out_resource;
1652                 WRITE32(1);
1653         }
1654         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1655                 if ((buflen -= 4) < 0)
1656                         goto out_resource;
1657                 WRITE32(1);
1658         }
1659         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1660                 if ((buflen -= 4) < 0)
1661                         goto out_resource;
1662                 WRITE32(1);
1663         }
1664         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1665                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1666                 if (buflen < 0)
1667                         goto out_resource;
1668                 WRITE32(fhp->fh_handle.fh_size);
1669                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1670         }
1671         if (bmval0 & FATTR4_WORD0_FILEID) {
1672                 if ((buflen -= 8) < 0)
1673                         goto out_resource;
1674                 WRITE64(stat.ino);
1675         }
1676         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1677                 if ((buflen -= 8) < 0)
1678                         goto out_resource;
1679                 WRITE64((u64) statfs.f_ffree);
1680         }
1681         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1682                 if ((buflen -= 8) < 0)
1683                         goto out_resource;
1684                 WRITE64((u64) statfs.f_ffree);
1685         }
1686         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1687                 if ((buflen -= 8) < 0)
1688                         goto out_resource;
1689                 WRITE64((u64) statfs.f_files);
1690         }
1691         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1692                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1693                 if (status == nfserr_resource)
1694                         goto out_resource;
1695                 if (status)
1696                         goto out;
1697         }
1698         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1699                 if ((buflen -= 4) < 0)
1700                         goto out_resource;
1701                 WRITE32(1);
1702         }
1703         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1704                 if ((buflen -= 8) < 0)
1705                         goto out_resource;
1706                 WRITE64(~(u64)0);
1707         }
1708         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1709                 if ((buflen -= 4) < 0)
1710                         goto out_resource;
1711                 WRITE32(255);
1712         }
1713         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1714                 if ((buflen -= 4) < 0)
1715                         goto out_resource;
1716                 WRITE32(statfs.f_namelen);
1717         }
1718         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1719                 if ((buflen -= 8) < 0)
1720                         goto out_resource;
1721                 WRITE64((u64) svc_max_payload(rqstp));
1722         }
1723         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1724                 if ((buflen -= 8) < 0)
1725                         goto out_resource;
1726                 WRITE64((u64) svc_max_payload(rqstp));
1727         }
1728         if (bmval1 & FATTR4_WORD1_MODE) {
1729                 if ((buflen -= 4) < 0)
1730                         goto out_resource;
1731                 WRITE32(stat.mode & S_IALLUGO);
1732         }
1733         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1734                 if ((buflen -= 4) < 0)
1735                         goto out_resource;
1736                 WRITE32(1);
1737         }
1738         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1739                 if ((buflen -= 4) < 0)
1740                         goto out_resource;
1741                 WRITE32(stat.nlink);
1742         }
1743         if (bmval1 & FATTR4_WORD1_OWNER) {
1744                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1745                 if (status == nfserr_resource)
1746                         goto out_resource;
1747                 if (status)
1748                         goto out;
1749         }
1750         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1751                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1752                 if (status == nfserr_resource)
1753                         goto out_resource;
1754                 if (status)
1755                         goto out;
1756         }
1757         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1758                 if ((buflen -= 8) < 0)
1759                         goto out_resource;
1760                 WRITE32((u32) MAJOR(stat.rdev));
1761                 WRITE32((u32) MINOR(stat.rdev));
1762         }
1763         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1764                 if ((buflen -= 8) < 0)
1765                         goto out_resource;
1766                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1767                 WRITE64(dummy64);
1768         }
1769         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1770                 if ((buflen -= 8) < 0)
1771                         goto out_resource;
1772                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1773                 WRITE64(dummy64);
1774         }
1775         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1776                 if ((buflen -= 8) < 0)
1777                         goto out_resource;
1778                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1779                 WRITE64(dummy64);
1780         }
1781         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1782                 if ((buflen -= 8) < 0)
1783                         goto out_resource;
1784                 dummy64 = (u64)stat.blocks << 9;
1785                 WRITE64(dummy64);
1786         }
1787         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1788                 if ((buflen -= 12) < 0)
1789                         goto out_resource;
1790                 WRITE32(0);
1791                 WRITE32(stat.atime.tv_sec);
1792                 WRITE32(stat.atime.tv_nsec);
1793         }
1794         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1795                 if ((buflen -= 12) < 0)
1796                         goto out_resource;
1797                 WRITE32(0);
1798                 WRITE32(1);
1799                 WRITE32(0);
1800         }
1801         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1802                 if ((buflen -= 12) < 0)
1803                         goto out_resource;
1804                 WRITE32(0);
1805                 WRITE32(stat.ctime.tv_sec);
1806                 WRITE32(stat.ctime.tv_nsec);
1807         }
1808         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1809                 if ((buflen -= 12) < 0)
1810                         goto out_resource;
1811                 WRITE32(0);
1812                 WRITE32(stat.mtime.tv_sec);
1813                 WRITE32(stat.mtime.tv_nsec);
1814         }
1815         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1816                 if ((buflen -= 8) < 0)
1817                         goto out_resource;
1818                 /*
1819                  * Get parent's attributes if not ignoring crossmount
1820                  * and this is the root of a cross-mounted filesystem.
1821                  */
1822                 if (ignore_crossmnt == 0 &&
1823                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
1824                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
1825                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
1826                         if (err)
1827                                 goto out_nfserr;
1828                 }
1829                 WRITE64(stat.ino);
1830         }
1831         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1832         *countp = p - buffer;
1833         status = nfs_ok;
1834
1835 out:
1836         kfree(acl);
1837         if (fhp == &tempfh)
1838                 fh_put(&tempfh);
1839         return status;
1840 out_nfserr:
1841         status = nfserrno(err);
1842         goto out;
1843 out_resource:
1844         *countp = 0;
1845         status = nfserr_resource;
1846         goto out;
1847 out_serverfault:
1848         status = nfserr_serverfault;
1849         goto out;
1850 }
1851
1852 static inline int attributes_need_mount(u32 *bmval)
1853 {
1854         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
1855                 return 1;
1856         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
1857                 return 1;
1858         return 0;
1859 }
1860
1861 static __be32
1862 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1863                 const char *name, int namlen, __be32 *p, int *buflen)
1864 {
1865         struct svc_export *exp = cd->rd_fhp->fh_export;
1866         struct dentry *dentry;
1867         __be32 nfserr;
1868         int ignore_crossmnt = 0;
1869
1870         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1871         if (IS_ERR(dentry))
1872                 return nfserrno(PTR_ERR(dentry));
1873
1874         exp_get(exp);
1875         /*
1876          * In the case of a mountpoint, the client may be asking for
1877          * attributes that are only properties of the underlying filesystem
1878          * as opposed to the cross-mounted file system. In such a case,
1879          * we will not follow the cross mount and will fill the attribtutes
1880          * directly from the mountpoint dentry.
1881          */
1882         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
1883                 ignore_crossmnt = 1;
1884         else if (d_mountpoint(dentry)) {
1885                 int err;
1886
1887                 /*
1888                  * Why the heck aren't we just using nfsd_lookup??
1889                  * Different "."/".." handling?  Something else?
1890                  * At least, add a comment here to explain....
1891                  */
1892                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1893                 if (err) {
1894                         nfserr = nfserrno(err);
1895                         goto out_put;
1896                 }
1897                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
1898                 if (nfserr)
1899                         goto out_put;
1900
1901         }
1902         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1903                                         cd->rd_rqstp, ignore_crossmnt);
1904 out_put:
1905         dput(dentry);
1906         exp_put(exp);
1907         return nfserr;
1908 }
1909
1910 static __be32 *
1911 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1912 {
1913         __be32 *attrlenp;
1914
1915         if (buflen < 6)
1916                 return NULL;
1917         *p++ = htonl(2);
1918         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1919         *p++ = htonl(0);                         /* bmval1 */
1920
1921         attrlenp = p++;
1922         *p++ = nfserr;       /* no htonl */
1923         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1924         return p;
1925 }
1926
1927 static int
1928 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1929                     loff_t offset, u64 ino, unsigned int d_type)
1930 {
1931         struct readdir_cd *ccd = ccdv;
1932         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1933         int buflen;
1934         __be32 *p = cd->buffer;
1935         __be32 nfserr = nfserr_toosmall;
1936
1937         /* In nfsv4, "." and ".." never make it onto the wire.. */
1938         if (name && isdotent(name, namlen)) {
1939                 cd->common.err = nfs_ok;
1940                 return 0;
1941         }
1942
1943         if (cd->offset)
1944                 xdr_encode_hyper(cd->offset, (u64) offset);
1945
1946         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1947         if (buflen < 0)
1948                 goto fail;
1949
1950         *p++ = xdr_one;                             /* mark entry present */
1951         cd->offset = p;                             /* remember pointer */
1952         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1953         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1954
1955         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1956         switch (nfserr) {
1957         case nfs_ok:
1958                 p += buflen;
1959                 break;
1960         case nfserr_resource:
1961                 nfserr = nfserr_toosmall;
1962                 goto fail;
1963         case nfserr_dropit:
1964                 goto fail;
1965         default:
1966                 /*
1967                  * If the client requested the RDATTR_ERROR attribute,
1968                  * we stuff the error code into this attribute
1969                  * and continue.  If this attribute was not requested,
1970                  * then in accordance with the spec, we fail the
1971                  * entire READDIR operation(!)
1972                  */
1973                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1974                         goto fail;
1975                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1976                 if (p == NULL) {
1977                         nfserr = nfserr_toosmall;
1978                         goto fail;
1979                 }
1980         }
1981         cd->buflen -= (p - cd->buffer);
1982         cd->buffer = p;
1983         cd->common.err = nfs_ok;
1984         return 0;
1985 fail:
1986         cd->common.err = nfserr;
1987         return -EINVAL;
1988 }
1989
1990 static void
1991 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1992 {
1993         ENCODE_HEAD;
1994
1995         if (!nfserr) {
1996                 RESERVE_SPACE(8);
1997                 WRITE32(access->ac_supported);
1998                 WRITE32(access->ac_resp_access);
1999                 ADJUST_ARGS();
2000         }
2001 }
2002
2003 static void
2004 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2005 {
2006         ENCODE_SEQID_OP_HEAD;
2007
2008         if (!nfserr) {
2009                 RESERVE_SPACE(sizeof(stateid_t));
2010                 WRITE32(close->cl_stateid.si_generation);
2011                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
2012                 ADJUST_ARGS();
2013         }
2014         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2015 }
2016
2017
2018 static void
2019 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2020 {
2021         ENCODE_HEAD;
2022
2023         if (!nfserr) {
2024                 RESERVE_SPACE(8);
2025                 WRITEMEM(commit->co_verf.data, 8);
2026                 ADJUST_ARGS();
2027         }
2028 }
2029
2030 static void
2031 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2032 {
2033         ENCODE_HEAD;
2034
2035         if (!nfserr) {
2036                 RESERVE_SPACE(32);
2037                 WRITECINFO(create->cr_cinfo);
2038                 WRITE32(2);
2039                 WRITE32(create->cr_bmval[0]);
2040                 WRITE32(create->cr_bmval[1]);
2041                 ADJUST_ARGS();
2042         }
2043 }
2044
2045 static __be32
2046 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2047 {
2048         struct svc_fh *fhp = getattr->ga_fhp;
2049         int buflen;
2050
2051         if (nfserr)
2052                 return nfserr;
2053
2054         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2055         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2056                                     resp->p, &buflen, getattr->ga_bmval,
2057                                     resp->rqstp, 0);
2058         if (!nfserr)
2059                 resp->p += buflen;
2060         return nfserr;
2061 }
2062
2063 static void
2064 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh *fhp)
2065 {
2066         unsigned int len;
2067         ENCODE_HEAD;
2068
2069         if (!nfserr) {
2070                 len = fhp->fh_handle.fh_size;
2071                 RESERVE_SPACE(len + 4);
2072                 WRITE32(len);
2073                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2074                 ADJUST_ARGS();
2075         }
2076 }
2077
2078 /*
2079 * Including all fields other than the name, a LOCK4denied structure requires
2080 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2081 */
2082 static void
2083 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2084 {
2085         ENCODE_HEAD;
2086
2087         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2088         WRITE64(ld->ld_start);
2089         WRITE64(ld->ld_length);
2090         WRITE32(ld->ld_type);
2091         if (ld->ld_sop) {
2092                 WRITEMEM(&ld->ld_clientid, 8);
2093                 WRITE32(ld->ld_sop->so_owner.len);
2094                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2095                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2096         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2097                 WRITE64((u64)0); /* clientid */
2098                 WRITE32(0); /* length of owner name */
2099         }
2100         ADJUST_ARGS();
2101 }
2102
2103 static void
2104 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2105 {
2106         ENCODE_SEQID_OP_HEAD;
2107
2108         if (!nfserr) {
2109                 RESERVE_SPACE(4 + sizeof(stateid_t));
2110                 WRITE32(lock->lk_resp_stateid.si_generation);
2111                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2112                 ADJUST_ARGS();
2113         } else if (nfserr == nfserr_denied)
2114                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2115
2116         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2117 }
2118
2119 static void
2120 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2121 {
2122         if (nfserr == nfserr_denied)
2123                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2124 }
2125
2126 static void
2127 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2128 {
2129         ENCODE_SEQID_OP_HEAD;
2130
2131         if (!nfserr) {
2132                 RESERVE_SPACE(sizeof(stateid_t));
2133                 WRITE32(locku->lu_stateid.si_generation);
2134                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2135                 ADJUST_ARGS();
2136         }
2137
2138         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2139 }
2140
2141
2142 static void
2143 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2144 {
2145         ENCODE_HEAD;
2146
2147         if (!nfserr) {
2148                 RESERVE_SPACE(20);
2149                 WRITECINFO(link->li_cinfo);
2150                 ADJUST_ARGS();
2151         }
2152 }
2153
2154
2155 static void
2156 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2157 {
2158         ENCODE_SEQID_OP_HEAD;
2159
2160         if (nfserr)
2161                 goto out;
2162
2163         RESERVE_SPACE(36 + sizeof(stateid_t));
2164         WRITE32(open->op_stateid.si_generation);
2165         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2166         WRITECINFO(open->op_cinfo);
2167         WRITE32(open->op_rflags);
2168         WRITE32(2);
2169         WRITE32(open->op_bmval[0]);
2170         WRITE32(open->op_bmval[1]);
2171         WRITE32(open->op_delegate_type);
2172         ADJUST_ARGS();
2173
2174         switch (open->op_delegate_type) {
2175         case NFS4_OPEN_DELEGATE_NONE:
2176                 break;
2177         case NFS4_OPEN_DELEGATE_READ:
2178                 RESERVE_SPACE(20 + sizeof(stateid_t));
2179                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2180                 WRITE32(open->op_recall);
2181
2182                 /*
2183                  * TODO: ACE's in delegations
2184                  */
2185                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2186                 WRITE32(0);
2187                 WRITE32(0);
2188                 WRITE32(0);   /* XXX: is NULL principal ok? */
2189                 ADJUST_ARGS();
2190                 break;
2191         case NFS4_OPEN_DELEGATE_WRITE:
2192                 RESERVE_SPACE(32 + sizeof(stateid_t));
2193                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2194                 WRITE32(0);
2195
2196                 /*
2197                  * TODO: space_limit's in delegations
2198                  */
2199                 WRITE32(NFS4_LIMIT_SIZE);
2200                 WRITE32(~(u32)0);
2201                 WRITE32(~(u32)0);
2202
2203                 /*
2204                  * TODO: ACE's in delegations
2205                  */
2206                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2207                 WRITE32(0);
2208                 WRITE32(0);
2209                 WRITE32(0);   /* XXX: is NULL principal ok? */
2210                 ADJUST_ARGS();
2211                 break;
2212         default:
2213                 BUG();
2214         }
2215         /* XXX save filehandle here */
2216 out:
2217         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2218 }
2219
2220 static void
2221 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2222 {
2223         ENCODE_SEQID_OP_HEAD;
2224
2225         if (!nfserr) {
2226                 RESERVE_SPACE(sizeof(stateid_t));
2227                 WRITE32(oc->oc_resp_stateid.si_generation);
2228                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2229                 ADJUST_ARGS();
2230         }
2231
2232         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2233 }
2234
2235 static void
2236 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2237 {
2238         ENCODE_SEQID_OP_HEAD;
2239
2240         if (!nfserr) {
2241                 RESERVE_SPACE(sizeof(stateid_t));
2242                 WRITE32(od->od_stateid.si_generation);
2243                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2244                 ADJUST_ARGS();
2245         }
2246
2247         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2248 }
2249
2250 static __be32
2251 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2252                   struct nfsd4_read *read)
2253 {
2254         u32 eof;
2255         int v, pn;
2256         unsigned long maxcount;
2257         long len;
2258         ENCODE_HEAD;
2259
2260         if (nfserr)
2261                 return nfserr;
2262         if (resp->xbuf->page_len)
2263                 return nfserr_resource;
2264
2265         RESERVE_SPACE(8); /* eof flag and byte count */
2266
2267         maxcount = svc_max_payload(resp->rqstp);
2268         if (maxcount > read->rd_length)
2269                 maxcount = read->rd_length;
2270
2271         len = maxcount;
2272         v = 0;
2273         while (len > 0) {
2274                 pn = resp->rqstp->rq_resused++;
2275                 resp->rqstp->rq_vec[v].iov_base =
2276                         page_address(resp->rqstp->rq_respages[pn]);
2277                 resp->rqstp->rq_vec[v].iov_len =
2278                         len < PAGE_SIZE ? len : PAGE_SIZE;
2279                 v++;
2280                 len -= PAGE_SIZE;
2281         }
2282         read->rd_vlen = v;
2283
2284         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2285                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2286                         &maxcount);
2287
2288         if (nfserr == nfserr_symlink)
2289                 nfserr = nfserr_inval;
2290         if (nfserr)
2291                 return nfserr;
2292         eof = (read->rd_offset + maxcount >=
2293                read->rd_fhp->fh_dentry->d_inode->i_size);
2294
2295         WRITE32(eof);
2296         WRITE32(maxcount);
2297         ADJUST_ARGS();
2298         resp->xbuf->head[0].iov_len = (char*)p
2299                                         - (char*)resp->xbuf->head[0].iov_base;
2300         resp->xbuf->page_len = maxcount;
2301
2302         /* Use rest of head for padding and remaining ops: */
2303         resp->xbuf->tail[0].iov_base = p;
2304         resp->xbuf->tail[0].iov_len = 0;
2305         if (maxcount&3) {
2306                 RESERVE_SPACE(4);
2307                 WRITE32(0);
2308                 resp->xbuf->tail[0].iov_base += maxcount&3;
2309                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2310                 ADJUST_ARGS();
2311         }
2312         return 0;
2313 }
2314
2315 static __be32
2316 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2317 {
2318         int maxcount;
2319         char *page;
2320         ENCODE_HEAD;
2321
2322         if (nfserr)
2323                 return nfserr;
2324         if (resp->xbuf->page_len)
2325                 return nfserr_resource;
2326
2327         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2328
2329         maxcount = PAGE_SIZE;
2330         RESERVE_SPACE(4);
2331
2332         /*
2333          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2334          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2335          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2336          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2337          */
2338         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2339         if (nfserr == nfserr_isdir)
2340                 return nfserr_inval;
2341         if (nfserr)
2342                 return nfserr;
2343
2344         WRITE32(maxcount);
2345         ADJUST_ARGS();
2346         resp->xbuf->head[0].iov_len = (char*)p
2347                                 - (char*)resp->xbuf->head[0].iov_base;
2348         resp->xbuf->page_len = maxcount;
2349
2350         /* Use rest of head for padding and remaining ops: */
2351         resp->xbuf->tail[0].iov_base = p;
2352         resp->xbuf->tail[0].iov_len = 0;
2353         if (maxcount&3) {
2354                 RESERVE_SPACE(4);
2355                 WRITE32(0);
2356                 resp->xbuf->tail[0].iov_base += maxcount&3;
2357                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2358                 ADJUST_ARGS();
2359         }
2360         return 0;
2361 }
2362
2363 static __be32
2364 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2365 {
2366         int maxcount;
2367         loff_t offset;
2368         __be32 *page, *savep, *tailbase;
2369         ENCODE_HEAD;
2370
2371         if (nfserr)
2372                 return nfserr;
2373         if (resp->xbuf->page_len)
2374                 return nfserr_resource;
2375
2376         RESERVE_SPACE(8);  /* verifier */
2377         savep = p;
2378
2379         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2380         WRITE32(0);
2381         WRITE32(0);
2382         ADJUST_ARGS();
2383         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2384         tailbase = p;
2385
2386         maxcount = PAGE_SIZE;
2387         if (maxcount > readdir->rd_maxcount)
2388                 maxcount = readdir->rd_maxcount;
2389
2390         /*
2391          * Convert from bytes to words, account for the two words already
2392          * written, make sure to leave two words at the end for the next
2393          * pointer and eof field.
2394          */
2395         maxcount = (maxcount >> 2) - 4;
2396         if (maxcount < 0) {
2397                 nfserr =  nfserr_toosmall;
2398                 goto err_no_verf;
2399         }
2400
2401         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2402         readdir->common.err = 0;
2403         readdir->buflen = maxcount;
2404         readdir->buffer = page;
2405         readdir->offset = NULL;
2406
2407         offset = readdir->rd_cookie;
2408         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2409                               &offset,
2410                               &readdir->common, nfsd4_encode_dirent);
2411         if (nfserr == nfs_ok &&
2412             readdir->common.err == nfserr_toosmall &&
2413             readdir->buffer == page)
2414                 nfserr = nfserr_toosmall;
2415         if (nfserr == nfserr_symlink)
2416                 nfserr = nfserr_notdir;
2417         if (nfserr)
2418                 goto err_no_verf;
2419
2420         if (readdir->offset)
2421                 xdr_encode_hyper(readdir->offset, offset);
2422
2423         p = readdir->buffer;
2424         *p++ = 0;       /* no more entries */
2425         *p++ = htonl(readdir->common.err == nfserr_eof);
2426         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2427                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2428
2429         /* Use rest of head for padding and remaining ops: */
2430         resp->xbuf->tail[0].iov_base = tailbase;
2431         resp->xbuf->tail[0].iov_len = 0;
2432         resp->p = resp->xbuf->tail[0].iov_base;
2433         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2434
2435         return 0;
2436 err_no_verf:
2437         p = savep;
2438         ADJUST_ARGS();
2439         return nfserr;
2440 }
2441
2442 static void
2443 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2444 {
2445         ENCODE_HEAD;
2446
2447         if (!nfserr) {
2448                 RESERVE_SPACE(20);
2449                 WRITECINFO(remove->rm_cinfo);
2450                 ADJUST_ARGS();
2451         }
2452 }
2453
2454 static void
2455 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2456 {
2457         ENCODE_HEAD;
2458
2459         if (!nfserr) {
2460                 RESERVE_SPACE(40);
2461                 WRITECINFO(rename->rn_sinfo);
2462                 WRITECINFO(rename->rn_tinfo);
2463                 ADJUST_ARGS();
2464         }
2465 }
2466
2467 static void
2468 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2469                      struct nfsd4_secinfo *secinfo)
2470 {
2471         int i = 0;
2472         struct svc_export *exp = secinfo->si_exp;
2473         u32 nflavs;
2474         struct exp_flavor_info *flavs;
2475         struct exp_flavor_info def_flavs[2];
2476         ENCODE_HEAD;
2477
2478         if (nfserr)
2479                 goto out;
2480         if (exp->ex_nflavors) {
2481                 flavs = exp->ex_flavors;
2482                 nflavs = exp->ex_nflavors;
2483         } else { /* Handling of some defaults in absence of real secinfo: */
2484                 flavs = def_flavs;
2485                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2486                         nflavs = 2;
2487                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2488                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2489                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2490                         nflavs = 1;
2491                         flavs[0].pseudoflavor
2492                                         = svcauth_gss_flavor(exp->ex_client);
2493                 } else {
2494                         nflavs = 1;
2495                         flavs[0].pseudoflavor
2496                                         = exp->ex_client->flavour->flavour;
2497                 }
2498         }
2499
2500         RESERVE_SPACE(4);
2501         WRITE32(nflavs);
2502         ADJUST_ARGS();
2503         for (i = 0; i < nflavs; i++) {
2504                 u32 flav = flavs[i].pseudoflavor;
2505                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2506
2507                 if (gm) {
2508                         RESERVE_SPACE(4);
2509                         WRITE32(RPC_AUTH_GSS);
2510                         ADJUST_ARGS();
2511                         RESERVE_SPACE(4 + gm->gm_oid.len);
2512                         WRITE32(gm->gm_oid.len);
2513                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2514                         ADJUST_ARGS();
2515                         RESERVE_SPACE(4);
2516                         WRITE32(0); /* qop */
2517                         ADJUST_ARGS();
2518                         RESERVE_SPACE(4);
2519                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2520                         ADJUST_ARGS();
2521                         gss_mech_put(gm);
2522                 } else {
2523                         RESERVE_SPACE(4);
2524                         WRITE32(flav);
2525                         ADJUST_ARGS();
2526                 }
2527         }
2528 out:
2529         if (exp)
2530                 exp_put(exp);
2531 }
2532
2533 /*
2534  * The SETATTR encode routine is special -- it always encodes a bitmap,
2535  * regardless of the error status.
2536  */
2537 static void
2538 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2539 {
2540         ENCODE_HEAD;
2541
2542         RESERVE_SPACE(12);
2543         if (nfserr) {
2544                 WRITE32(2);
2545                 WRITE32(0);
2546                 WRITE32(0);
2547         }
2548         else {
2549                 WRITE32(2);
2550                 WRITE32(setattr->sa_bmval[0]);
2551                 WRITE32(setattr->sa_bmval[1]);
2552         }
2553         ADJUST_ARGS();
2554 }
2555
2556 static void
2557 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2558 {
2559         ENCODE_HEAD;
2560
2561         if (!nfserr) {
2562                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2563                 WRITEMEM(&scd->se_clientid, 8);
2564                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2565                 ADJUST_ARGS();
2566         }
2567         else if (nfserr == nfserr_clid_inuse) {
2568                 RESERVE_SPACE(8);
2569                 WRITE32(0);
2570                 WRITE32(0);
2571                 ADJUST_ARGS();
2572         }
2573 }
2574
2575 static void
2576 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2577 {
2578         ENCODE_HEAD;
2579
2580         if (!nfserr) {
2581                 RESERVE_SPACE(16);
2582                 WRITE32(write->wr_bytes_written);
2583                 WRITE32(write->wr_how_written);
2584                 WRITEMEM(write->wr_verifier.data, 8);
2585                 ADJUST_ARGS();
2586         }
2587 }
2588
2589 void
2590 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2591 {
2592         __be32 *statp;
2593         ENCODE_HEAD;
2594
2595         RESERVE_SPACE(8);
2596         WRITE32(op->opnum);
2597         statp = p++;    /* to be backfilled at the end */
2598         ADJUST_ARGS();
2599
2600         switch (op->opnum) {
2601         case OP_ACCESS:
2602                 nfsd4_encode_access(resp, op->status, &op->u.access);
2603                 break;
2604         case OP_CLOSE:
2605                 nfsd4_encode_close(resp, op->status, &op->u.close);
2606                 break;
2607         case OP_COMMIT:
2608                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2609                 break;
2610         case OP_CREATE:
2611                 nfsd4_encode_create(resp, op->status, &op->u.create);
2612                 break;
2613         case OP_DELEGRETURN:
2614                 break;
2615         case OP_GETATTR:
2616                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2617                 break;
2618         case OP_GETFH:
2619                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2620                 break;
2621         case OP_LINK:
2622                 nfsd4_encode_link(resp, op->status, &op->u.link);
2623                 break;
2624         case OP_LOCK:
2625                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2626                 break;
2627         case OP_LOCKT:
2628                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2629                 break;
2630         case OP_LOCKU:
2631                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2632                 break;
2633         case OP_LOOKUP:
2634                 break;
2635         case OP_LOOKUPP:
2636                 break;
2637         case OP_NVERIFY:
2638                 break;
2639         case OP_OPEN:
2640                 nfsd4_encode_open(resp, op->status, &op->u.open);
2641                 break;
2642         case OP_OPEN_CONFIRM:
2643                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2644                 break;
2645         case OP_OPEN_DOWNGRADE:
2646                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2647                 break;
2648         case OP_PUTFH:
2649                 break;
2650         case OP_PUTROOTFH:
2651                 break;
2652         case OP_READ:
2653                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2654                 break;
2655         case OP_READDIR:
2656                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2657                 break;
2658         case OP_READLINK:
2659                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2660                 break;
2661         case OP_REMOVE:
2662                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2663                 break;
2664         case OP_RENAME:
2665                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2666                 break;
2667         case OP_RENEW:
2668                 break;
2669         case OP_RESTOREFH:
2670                 break;
2671         case OP_SAVEFH:
2672                 break;
2673         case OP_SECINFO:
2674                 nfsd4_encode_secinfo(resp, op->status, &op->u.secinfo);
2675                 break;
2676         case OP_SETATTR:
2677                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2678                 break;
2679         case OP_SETCLIENTID:
2680                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2681                 break;
2682         case OP_SETCLIENTID_CONFIRM:
2683                 break;
2684         case OP_VERIFY:
2685                 break;
2686         case OP_WRITE:
2687                 nfsd4_encode_write(resp, op->status, &op->u.write);
2688                 break;
2689         case OP_RELEASE_LOCKOWNER:
2690                 break;
2691         default:
2692                 break;
2693         }
2694
2695         /*
2696          * Note: We write the status directly, instead of using WRITE32(),
2697          * since it is already in network byte order.
2698          */
2699         *statp = op->status;
2700 }
2701
2702 /*
2703  * Encode the reply stored in the stateowner reply cache
2704  *
2705  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2706  * previously sent already encoded operation.
2707  *
2708  * called with nfs4_lock_state() held
2709  */
2710 void
2711 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2712 {
2713         ENCODE_HEAD;
2714         struct nfs4_replay *rp = op->replay;
2715
2716         BUG_ON(!rp);
2717
2718         RESERVE_SPACE(8);
2719         WRITE32(op->opnum);
2720         *p++ = rp->rp_status;  /* already xdr'ed */
2721         ADJUST_ARGS();
2722
2723         RESERVE_SPACE(rp->rp_buflen);
2724         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2725         ADJUST_ARGS();
2726 }
2727
2728 /*
2729  * END OF "GENERIC" ENCODE ROUTINES.
2730  */
2731
2732 int
2733 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2734 {
2735         return xdr_ressize_check(rqstp, p);
2736 }
2737
2738 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2739 {
2740         if (args->ops != args->iops) {
2741                 kfree(args->ops);
2742                 args->ops = args->iops;
2743         }
2744         kfree(args->tmpp);
2745         args->tmpp = NULL;
2746         while (args->to_free) {
2747                 struct tmpbuf *tb = args->to_free;
2748                 args->to_free = tb->next;
2749                 tb->release(tb->buf);
2750                 kfree(tb);
2751         }
2752 }
2753
2754 int
2755 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2756 {
2757         __be32 status;
2758
2759         args->p = p;
2760         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2761         args->pagelist = rqstp->rq_arg.pages;
2762         args->pagelen = rqstp->rq_arg.page_len;
2763         args->tmpp = NULL;
2764         args->to_free = NULL;
2765         args->ops = args->iops;
2766         args->rqstp = rqstp;
2767
2768         status = nfsd4_decode_compound(args);
2769         if (status) {
2770                 nfsd4_release_compoundargs(args);
2771         }
2772         return !status;
2773 }
2774
2775 int
2776 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2777 {
2778         /*
2779          * All that remains is to write the tag and operation count...
2780          */
2781         struct kvec *iov;
2782         p = resp->tagp;
2783         *p++ = htonl(resp->taglen);
2784         memcpy(p, resp->tag, resp->taglen);
2785         p += XDR_QUADLEN(resp->taglen);
2786         *p++ = htonl(resp->opcnt);
2787
2788         if (rqstp->rq_res.page_len)
2789                 iov = &rqstp->rq_res.tail[0];
2790         else
2791                 iov = &rqstp->rq_res.head[0];
2792         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2793         BUG_ON(iov->iov_len > PAGE_SIZE);
2794         return 1;
2795 }
2796
2797 /*
2798  * Local variables:
2799  *  c-basic-offset: 8
2800  * End:
2801  */