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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_noop(struct nfsd4_compoundargs *argp, void *p)
 990 {
 991         return nfs_ok;
 992 }
 993
 994 static __be32
 995 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
 996 {
 997         return nfserr_opnotsupp;
 998 }
 999
1000 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1001
1002 static nfsd4_dec nfsd4_dec_ops[] = {
1003         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1004         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1005         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1006         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1007         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1008         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1009         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1010         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1011         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1012         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1013         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1014         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1015         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1016         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1017         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1018         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1019         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1020         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1021         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1022         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1023         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1024         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1025         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1026         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1027         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1028         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1029         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1030         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1031         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1032         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1033         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1034         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1035         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1036         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1037         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1038         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1039         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1040 };
1041
1042 struct nfsd4_minorversion_ops {
1043         nfsd4_dec *decoders;
1044         int nops;
1045 };
1046
1047 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1048         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1049 };
1050
1051 static __be32
1052 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1053 {
1054         DECODE_HEAD;
1055         struct nfsd4_op *op;
1056         struct nfsd4_minorversion_ops *ops;
1057         int i;
1058
1059         /*
1060          * XXX: According to spec, we should check the tag
1061          * for UTF-8 compliance.  I'm postponing this for
1062          * now because it seems that some clients do use
1063          * binary tags.
1064          */
1065         READ_BUF(4);
1066         READ32(argp->taglen);
1067         READ_BUF(argp->taglen + 8);
1068         SAVEMEM(argp->tag, argp->taglen);
1069         READ32(argp->minorversion);
1070         READ32(argp->opcnt);
1071
1072         if (argp->taglen > NFSD4_MAX_TAGLEN)
1073                 goto xdr_error;
1074         if (argp->opcnt > 100)
1075                 goto xdr_error;
1076
1077         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1078                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1079                 if (!argp->ops) {
1080                         argp->ops = argp->iops;
1081                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1082                         goto xdr_error;
1083                 }
1084         }
1085
1086         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1087                 argp->opcnt = 0;
1088
1089         ops = &nfsd4_minorversion[argp->minorversion];
1090         for (i = 0; i < argp->opcnt; i++) {
1091                 op = &argp->ops[i];
1092                 op->replay = NULL;
1093
1094                 /*
1095                  * We can't use READ_BUF() here because we need to handle
1096                  * a missing opcode as an OP_WRITE + 1. So we need to check
1097                  * to see if we're truly at the end of our buffer or if there
1098                  * is another page we need to flip to.
1099                  */
1100
1101                 if (argp->p == argp->end) {
1102                         if (argp->pagelen < 4) {
1103                                 /* There isn't an opcode still on the wire */
1104                                 op->opnum = OP_WRITE + 1;
1105                                 op->status = nfserr_bad_xdr;
1106                                 argp->opcnt = i+1;
1107                                 break;
1108                         }
1109
1110                         /*
1111                          * False alarm. We just hit a page boundary, but there
1112                          * is still data available.  Move pointer across page
1113                          * boundary.  *snip from READ_BUF*
1114                          */
1115                         argp->p = page_address(argp->pagelist[0]);
1116                         argp->pagelist++;
1117                         if (argp->pagelen < PAGE_SIZE) {
1118                                 argp->end = p + (argp->pagelen>>2);
1119                                 argp->pagelen = 0;
1120                         } else {
1121                                 argp->end = p + (PAGE_SIZE>>2);
1122                                 argp->pagelen -= PAGE_SIZE;
1123                         }
1124                 }
1125                 op->opnum = ntohl(*argp->p++);
1126
1127                 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1128                         op->status = ops->decoders[op->opnum](argp, &op->u);
1129                 else {
1130                         op->opnum = OP_ILLEGAL;
1131                         op->status = nfserr_op_illegal;
1132                 }
1133
1134                 if (op->status) {
1135                         argp->opcnt = i+1;
1136                         break;
1137                 }
1138         }
1139
1140         DECODE_TAIL;
1141 }
1142 /*
1143  * END OF "GENERIC" DECODE ROUTINES.
1144  */
1145
1146 /*
1147  * START OF "GENERIC" ENCODE ROUTINES.
1148  *   These may look a little ugly since they are imported from a "generic"
1149  * set of XDR encode/decode routines which are intended to be shared by
1150  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1151  *
1152  * If the pain of reading these is too great, it should be a straightforward
1153  * task to translate them into Linux-specific versions which are more
1154  * consistent with the style used in NFSv2/v3...
1155  */
1156 #define ENCODE_HEAD              __be32 *p
1157
1158 #define WRITE32(n)               *p++ = htonl(n)
1159 #define WRITE64(n)               do {                           \
1160         *p++ = htonl((u32)((n) >> 32));                         \
1161         *p++ = htonl((u32)(n));                                 \
1162 } while (0)
1163 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1164         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1165         memcpy(p, ptr, nbytes);                                 \
1166         p += XDR_QUADLEN(nbytes);                               \
1167 }} while (0)
1168 #define WRITECINFO(c)           do {                            \
1169         *p++ = htonl(c.atomic);                                 \
1170         *p++ = htonl(c.before_ctime_sec);                               \
1171         *p++ = htonl(c.before_ctime_nsec);                              \
1172         *p++ = htonl(c.after_ctime_sec);                                \
1173         *p++ = htonl(c.after_ctime_nsec);                               \
1174 } while (0)
1175
1176 #define RESERVE_SPACE(nbytes)   do {                            \
1177         p = resp->p;                                            \
1178         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1179 } while (0)
1180 #define ADJUST_ARGS()           resp->p = p
1181
1182 /*
1183  * Header routine to setup seqid operation replay cache
1184  */
1185 #define ENCODE_SEQID_OP_HEAD                                    \
1186         __be32 *p;                                              \
1187         __be32 *save;                                           \
1188                                                                 \
1189         save = resp->p;
1190
1191 /*
1192  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1193  * is where sequence id's are incremented, and the replay cache is filled.
1194  * Note that we increment sequence id's here, at the last moment, so we're sure
1195  * we know whether the error to be returned is a sequence id mutating error.
1196  */
1197
1198 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1199         if (seqid_mutating_err(nfserr) && stateowner) {         \
1200                 stateowner->so_seqid++;                         \
1201                 stateowner->so_replay.rp_status = nfserr;       \
1202                 stateowner->so_replay.rp_buflen =               \
1203                           (((char *)(resp)->p - (char *)save)); \
1204                 memcpy(stateowner->so_replay.rp_buf, save,      \
1205                         stateowner->so_replay.rp_buflen);       \
1206         } } while (0);
1207
1208 /* Encode as an array of strings the string given with components
1209  * seperated @sep.
1210  */
1211 static __be32 nfsd4_encode_components(char sep, char *components,
1212                                    __be32 **pp, int *buflen)
1213 {
1214         __be32 *p = *pp;
1215         __be32 *countp = p;
1216         int strlen, count=0;
1217         char *str, *end;
1218
1219         dprintk("nfsd4_encode_components(%s)\n", components);
1220         if ((*buflen -= 4) < 0)
1221                 return nfserr_resource;
1222         WRITE32(0); /* We will fill this in with @count later */
1223         end = str = components;
1224         while (*end) {
1225                 for (; *end && (*end != sep); end++)
1226                         ; /* Point to end of component */
1227                 strlen = end - str;
1228                 if (strlen) {
1229                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1230                                 return nfserr_resource;
1231                         WRITE32(strlen);
1232                         WRITEMEM(str, strlen);
1233                         count++;
1234                 }
1235                 else
1236                         end++;
1237                 str = end;
1238         }
1239         *pp = p;
1240         p = countp;
1241         WRITE32(count);
1242         return 0;
1243 }
1244
1245 /*
1246  * encode a location element of a fs_locations structure
1247  */
1248 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1249                                     __be32 **pp, int *buflen)
1250 {
1251         __be32 status;
1252         __be32 *p = *pp;
1253
1254         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1255         if (status)
1256                 return status;
1257         status = nfsd4_encode_components('/', location->path, &p, buflen);
1258         if (status)
1259                 return status;
1260         *pp = p;
1261         return 0;
1262 }
1263
1264 /*
1265  * Return the path to an export point in the pseudo filesystem namespace
1266  * Returned string is safe to use as long as the caller holds a reference
1267  * to @exp.
1268  */
1269 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1270 {
1271         struct svc_fh tmp_fh;
1272         char *path, *rootpath;
1273
1274         fh_init(&tmp_fh, NFS4_FHSIZE);
1275         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1276         if (*stat)
1277                 return NULL;
1278         rootpath = tmp_fh.fh_export->ex_pathname;
1279
1280         path = exp->ex_pathname;
1281
1282         if (strncmp(path, rootpath, strlen(rootpath))) {
1283                 dprintk("nfsd: fs_locations failed;"
1284                         "%s is not contained in %s\n", path, rootpath);
1285                 *stat = nfserr_notsupp;
1286                 return NULL;
1287         }
1288
1289         return path + strlen(rootpath);
1290 }
1291
1292 /*
1293  *  encode a fs_locations structure
1294  */
1295 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1296                                      struct svc_export *exp,
1297                                      __be32 **pp, int *buflen)
1298 {
1299         __be32 status;
1300         int i;
1301         __be32 *p = *pp;
1302         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1303         char *root = nfsd4_path(rqstp, exp, &status);
1304
1305         if (status)
1306                 return status;
1307         status = nfsd4_encode_components('/', root, &p, buflen);
1308         if (status)
1309                 return status;
1310         if ((*buflen -= 4) < 0)
1311                 return nfserr_resource;
1312         WRITE32(fslocs->locations_count);
1313         for (i=0; i<fslocs->locations_count; i++) {
1314                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1315                                                    &p, buflen);
1316                 if (status)
1317                         return status;
1318         }
1319         *pp = p;
1320         return 0;
1321 }
1322
1323 static u32 nfs4_ftypes[16] = {
1324         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1325         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1326         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1327         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1328 };
1329
1330 static __be32
1331 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1332                         __be32 **p, int *buflen)
1333 {
1334         int status;
1335
1336         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1337                 return nfserr_resource;
1338         if (whotype != NFS4_ACL_WHO_NAMED)
1339                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1340         else if (group)
1341                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1342         else
1343                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1344         if (status < 0)
1345                 return nfserrno(status);
1346         *p = xdr_encode_opaque(*p, NULL, status);
1347         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1348         BUG_ON(*buflen < 0);
1349         return 0;
1350 }
1351
1352 static inline __be32
1353 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1354 {
1355         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1356 }
1357
1358 static inline __be32
1359 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1360 {
1361         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1362 }
1363
1364 static inline __be32
1365 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1366                 __be32 **p, int *buflen)
1367 {
1368         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1369 }
1370
1371 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1372                               FATTR4_WORD0_RDATTR_ERROR)
1373 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1374
1375 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1376 {
1377         /* As per referral draft:  */
1378         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1379             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1380                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1381                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1382                         *rdattr_err = NFSERR_MOVED;
1383                 else
1384                         return nfserr_moved;
1385         }
1386         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1387         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1388         return 0;
1389 }
1390
1391 /*
1392  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1393  * ourselves.
1394  *
1395  * @countp is the buffer size in _words_; upon successful return this becomes
1396  * replaced with the number of words written.
1397  */
1398 __be32
1399 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1400                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1401                 struct svc_rqst *rqstp, int ignore_crossmnt)
1402 {
1403         u32 bmval0 = bmval[0];
1404         u32 bmval1 = bmval[1];
1405         struct kstat stat;
1406         struct svc_fh tempfh;
1407         struct kstatfs statfs;
1408         int buflen = *countp << 2;
1409         __be32 *attrlenp;
1410         u32 dummy;
1411         u64 dummy64;
1412         u32 rdattr_err = 0;
1413         __be32 *p = buffer;
1414         __be32 status;
1415         int err;
1416         int aclsupport = 0;
1417         struct nfs4_acl *acl = NULL;
1418
1419         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1420         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1421         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1422
1423         if (exp->ex_fslocs.migrated) {
1424                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1425                 if (status)
1426                         goto out;
1427         }
1428
1429         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1430         if (err)
1431                 goto out_nfserr;
1432         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1433                         FATTR4_WORD0_MAXNAME)) ||
1434             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1435                        FATTR4_WORD1_SPACE_TOTAL))) {
1436                 err = vfs_statfs(dentry, &statfs);
1437                 if (err)
1438                         goto out_nfserr;
1439         }
1440         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1441                 fh_init(&tempfh, NFS4_FHSIZE);
1442                 status = fh_compose(&tempfh, exp, dentry, NULL);
1443                 if (status)
1444                         goto out;
1445                 fhp = &tempfh;
1446         }
1447         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1448                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1449                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1450                 aclsupport = (err == 0);
1451                 if (bmval0 & FATTR4_WORD0_ACL) {
1452                         if (err == -EOPNOTSUPP)
1453                                 bmval0 &= ~FATTR4_WORD0_ACL;
1454                         else if (err == -EINVAL) {
1455                                 status = nfserr_attrnotsupp;
1456                                 goto out;
1457                         } else if (err != 0)
1458                                 goto out_nfserr;
1459                 }
1460         }
1461         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1462                 if (exp->ex_fslocs.locations == NULL) {
1463                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1464                 }
1465         }
1466         if ((buflen -= 16) < 0)
1467                 goto out_resource;
1468
1469         WRITE32(2);
1470         WRITE32(bmval0);
1471         WRITE32(bmval1);
1472         attrlenp = p++;                /* to be backfilled later */
1473
1474         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1475                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1476                 if ((buflen -= 12) < 0)
1477                         goto out_resource;
1478                 if (!aclsupport)
1479                         word0 &= ~FATTR4_WORD0_ACL;
1480                 if (!exp->ex_fslocs.locations)
1481                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1482                 WRITE32(2);
1483                 WRITE32(word0);
1484                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1485         }
1486         if (bmval0 & FATTR4_WORD0_TYPE) {
1487                 if ((buflen -= 4) < 0)
1488                         goto out_resource;
1489                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1490                 if (dummy == NF4BAD)
1491                         goto out_serverfault;
1492                 WRITE32(dummy);
1493         }
1494         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1495                 if ((buflen -= 4) < 0)
1496                         goto out_resource;
1497                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1498                         WRITE32(NFS4_FH_PERSISTENT);
1499                 else
1500                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1501         }
1502         if (bmval0 & FATTR4_WORD0_CHANGE) {
1503                 /*
1504                  * Note: This _must_ be consistent with the scheme for writing
1505                  * change_info, so any changes made here must be reflected there
1506                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1507                  * macro above.)
1508                  */
1509                 if ((buflen -= 8) < 0)
1510                         goto out_resource;
1511                 WRITE32(stat.ctime.tv_sec);
1512                 WRITE32(stat.ctime.tv_nsec);
1513         }
1514         if (bmval0 & FATTR4_WORD0_SIZE) {
1515                 if ((buflen -= 8) < 0)
1516                         goto out_resource;
1517                 WRITE64(stat.size);
1518         }
1519         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1520                 if ((buflen -= 4) < 0)
1521                         goto out_resource;
1522                 WRITE32(1);
1523         }
1524         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1525                 if ((buflen -= 4) < 0)
1526                         goto out_resource;
1527                 WRITE32(1);
1528         }
1529         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1530                 if ((buflen -= 4) < 0)
1531                         goto out_resource;
1532                 WRITE32(0);
1533         }
1534         if (bmval0 & FATTR4_WORD0_FSID) {
1535                 if ((buflen -= 16) < 0)
1536                         goto out_resource;
1537                 if (exp->ex_fslocs.migrated) {
1538                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1539                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1540                 } else switch(fsid_source(fhp)) {
1541                 case FSIDSOURCE_FSID:
1542                         WRITE64((u64)exp->ex_fsid);
1543                         WRITE64((u64)0);
1544                         break;
1545                 case FSIDSOURCE_DEV:
1546                         WRITE32(0);
1547                         WRITE32(MAJOR(stat.dev));
1548                         WRITE32(0);
1549                         WRITE32(MINOR(stat.dev));
1550                         break;
1551                 case FSIDSOURCE_UUID:
1552                         WRITEMEM(exp->ex_uuid, 16);
1553                         break;
1554                 }
1555         }
1556         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1557                 if ((buflen -= 4) < 0)
1558                         goto out_resource;
1559                 WRITE32(0);
1560         }
1561         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1562                 if ((buflen -= 4) < 0)
1563                         goto out_resource;
1564                 WRITE32(NFSD_LEASE_TIME);
1565         }
1566         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1567                 if ((buflen -= 4) < 0)
1568                         goto out_resource;
1569                 WRITE32(rdattr_err);
1570         }
1571         if (bmval0 & FATTR4_WORD0_ACL) {
1572                 struct nfs4_ace *ace;
1573
1574                 if (acl == NULL) {
1575                         if ((buflen -= 4) < 0)
1576                                 goto out_resource;
1577
1578                         WRITE32(0);
1579                         goto out_acl;
1580                 }
1581                 if ((buflen -= 4) < 0)
1582                         goto out_resource;
1583                 WRITE32(acl->naces);
1584
1585                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1586                         if ((buflen -= 4*3) < 0)
1587                                 goto out_resource;
1588                         WRITE32(ace->type);
1589                         WRITE32(ace->flag);
1590                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1591                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1592                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1593                                 &p, &buflen);
1594                         if (status == nfserr_resource)
1595                                 goto out_resource;
1596                         if (status)
1597                                 goto out;
1598                 }
1599         }
1600 out_acl:
1601         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1602                 if ((buflen -= 4) < 0)
1603                         goto out_resource;
1604                 WRITE32(aclsupport ?
1605                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1606         }
1607         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1608                 if ((buflen -= 4) < 0)
1609                         goto out_resource;
1610                 WRITE32(1);
1611         }
1612         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1613                 if ((buflen -= 4) < 0)
1614                         goto out_resource;
1615                 WRITE32(1);
1616         }
1617         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1618                 if ((buflen -= 4) < 0)
1619                         goto out_resource;
1620                 WRITE32(1);
1621         }
1622         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1623                 if ((buflen -= 4) < 0)
1624                         goto out_resource;
1625                 WRITE32(1);
1626         }
1627         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1628                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1629                 if (buflen < 0)
1630                         goto out_resource;
1631                 WRITE32(fhp->fh_handle.fh_size);
1632                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1633         }
1634         if (bmval0 & FATTR4_WORD0_FILEID) {
1635                 if ((buflen -= 8) < 0)
1636                         goto out_resource;
1637                 WRITE64(stat.ino);
1638         }
1639         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1640                 if ((buflen -= 8) < 0)
1641                         goto out_resource;
1642                 WRITE64((u64) statfs.f_ffree);
1643         }
1644         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1645                 if ((buflen -= 8) < 0)
1646                         goto out_resource;
1647                 WRITE64((u64) statfs.f_ffree);
1648         }
1649         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1650                 if ((buflen -= 8) < 0)
1651                         goto out_resource;
1652                 WRITE64((u64) statfs.f_files);
1653         }
1654         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1655                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1656                 if (status == nfserr_resource)
1657                         goto out_resource;
1658                 if (status)
1659                         goto out;
1660         }
1661         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1662                 if ((buflen -= 4) < 0)
1663                         goto out_resource;
1664                 WRITE32(1);
1665         }
1666         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1667                 if ((buflen -= 8) < 0)
1668                         goto out_resource;
1669                 WRITE64(~(u64)0);
1670         }
1671         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1672                 if ((buflen -= 4) < 0)
1673                         goto out_resource;
1674                 WRITE32(255);
1675         }
1676         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1677                 if ((buflen -= 4) < 0)
1678                         goto out_resource;
1679                 WRITE32(statfs.f_namelen);
1680         }
1681         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1682                 if ((buflen -= 8) < 0)
1683                         goto out_resource;
1684                 WRITE64((u64) svc_max_payload(rqstp));
1685         }
1686         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1687                 if ((buflen -= 8) < 0)
1688                         goto out_resource;
1689                 WRITE64((u64) svc_max_payload(rqstp));
1690         }
1691         if (bmval1 & FATTR4_WORD1_MODE) {
1692                 if ((buflen -= 4) < 0)
1693                         goto out_resource;
1694                 WRITE32(stat.mode & S_IALLUGO);
1695         }
1696         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1697                 if ((buflen -= 4) < 0)
1698                         goto out_resource;
1699                 WRITE32(1);
1700         }
1701         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1702                 if ((buflen -= 4) < 0)
1703                         goto out_resource;
1704                 WRITE32(stat.nlink);
1705         }
1706         if (bmval1 & FATTR4_WORD1_OWNER) {
1707                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1708                 if (status == nfserr_resource)
1709                         goto out_resource;
1710                 if (status)
1711                         goto out;
1712         }
1713         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1714                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1715                 if (status == nfserr_resource)
1716                         goto out_resource;
1717                 if (status)
1718                         goto out;
1719         }
1720         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1721                 if ((buflen -= 8) < 0)
1722                         goto out_resource;
1723                 WRITE32((u32) MAJOR(stat.rdev));
1724                 WRITE32((u32) MINOR(stat.rdev));
1725         }
1726         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1727                 if ((buflen -= 8) < 0)
1728                         goto out_resource;
1729                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1730                 WRITE64(dummy64);
1731         }
1732         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1733                 if ((buflen -= 8) < 0)
1734                         goto out_resource;
1735                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1736                 WRITE64(dummy64);
1737         }
1738         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1739                 if ((buflen -= 8) < 0)
1740                         goto out_resource;
1741                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1742                 WRITE64(dummy64);
1743         }
1744         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1745                 if ((buflen -= 8) < 0)
1746                         goto out_resource;
1747                 dummy64 = (u64)stat.blocks << 9;
1748                 WRITE64(dummy64);
1749         }
1750         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1751                 if ((buflen -= 12) < 0)
1752                         goto out_resource;
1753                 WRITE32(0);
1754                 WRITE32(stat.atime.tv_sec);
1755                 WRITE32(stat.atime.tv_nsec);
1756         }
1757         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1758                 if ((buflen -= 12) < 0)
1759                         goto out_resource;
1760                 WRITE32(0);
1761                 WRITE32(1);
1762                 WRITE32(0);
1763         }
1764         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1765                 if ((buflen -= 12) < 0)
1766                         goto out_resource;
1767                 WRITE32(0);
1768                 WRITE32(stat.ctime.tv_sec);
1769                 WRITE32(stat.ctime.tv_nsec);
1770         }
1771         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1772                 if ((buflen -= 12) < 0)
1773                         goto out_resource;
1774                 WRITE32(0);
1775                 WRITE32(stat.mtime.tv_sec);
1776                 WRITE32(stat.mtime.tv_nsec);
1777         }
1778         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1779                 if ((buflen -= 8) < 0)
1780                         goto out_resource;
1781                 /*
1782                  * Get parent's attributes if not ignoring crossmount
1783                  * and this is the root of a cross-mounted filesystem.
1784                  */
1785                 if (ignore_crossmnt == 0 &&
1786                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
1787                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
1788                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
1789                         if (err)
1790                                 goto out_nfserr;
1791                 }
1792                 WRITE64(stat.ino);
1793         }
1794         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1795         *countp = p - buffer;
1796         status = nfs_ok;
1797
1798 out:
1799         kfree(acl);
1800         if (fhp == &tempfh)
1801                 fh_put(&tempfh);
1802         return status;
1803 out_nfserr:
1804         status = nfserrno(err);
1805         goto out;
1806 out_resource:
1807         *countp = 0;
1808         status = nfserr_resource;
1809         goto out;
1810 out_serverfault:
1811         status = nfserr_serverfault;
1812         goto out;
1813 }
1814
1815 static inline int attributes_need_mount(u32 *bmval)
1816 {
1817         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
1818                 return 1;
1819         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
1820                 return 1;
1821         return 0;
1822 }
1823
1824 static __be32
1825 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1826                 const char *name, int namlen, __be32 *p, int *buflen)
1827 {
1828         struct svc_export *exp = cd->rd_fhp->fh_export;
1829         struct dentry *dentry;
1830         __be32 nfserr;
1831         int ignore_crossmnt = 0;
1832
1833         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1834         if (IS_ERR(dentry))
1835                 return nfserrno(PTR_ERR(dentry));
1836
1837         exp_get(exp);
1838         /*
1839          * In the case of a mountpoint, the client may be asking for
1840          * attributes that are only properties of the underlying filesystem
1841          * as opposed to the cross-mounted file system. In such a case,
1842          * we will not follow the cross mount and will fill the attribtutes
1843          * directly from the mountpoint dentry.
1844          */
1845         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
1846                 ignore_crossmnt = 1;
1847         else if (d_mountpoint(dentry)) {
1848                 int err;
1849
1850                 /*
1851                  * Why the heck aren't we just using nfsd_lookup??
1852                  * Different "."/".." handling?  Something else?
1853                  * At least, add a comment here to explain....
1854                  */
1855                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1856                 if (err) {
1857                         nfserr = nfserrno(err);
1858                         goto out_put;
1859                 }
1860                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
1861                 if (nfserr)
1862                         goto out_put;
1863
1864         }
1865         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1866                                         cd->rd_rqstp, ignore_crossmnt);
1867 out_put:
1868         dput(dentry);
1869         exp_put(exp);
1870         return nfserr;
1871 }
1872
1873 static __be32 *
1874 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1875 {
1876         __be32 *attrlenp;
1877
1878         if (buflen < 6)
1879                 return NULL;
1880         *p++ = htonl(2);
1881         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1882         *p++ = htonl(0);                         /* bmval1 */
1883
1884         attrlenp = p++;
1885         *p++ = nfserr;       /* no htonl */
1886         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1887         return p;
1888 }
1889
1890 static int
1891 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1892                     loff_t offset, u64 ino, unsigned int d_type)
1893 {
1894         struct readdir_cd *ccd = ccdv;
1895         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1896         int buflen;
1897         __be32 *p = cd->buffer;
1898         __be32 nfserr = nfserr_toosmall;
1899
1900         /* In nfsv4, "." and ".." never make it onto the wire.. */
1901         if (name && isdotent(name, namlen)) {
1902                 cd->common.err = nfs_ok;
1903                 return 0;
1904         }
1905
1906         if (cd->offset)
1907                 xdr_encode_hyper(cd->offset, (u64) offset);
1908
1909         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1910         if (buflen < 0)
1911                 goto fail;
1912
1913         *p++ = xdr_one;                             /* mark entry present */
1914         cd->offset = p;                             /* remember pointer */
1915         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1916         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1917
1918         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1919         switch (nfserr) {
1920         case nfs_ok:
1921                 p += buflen;
1922                 break;
1923         case nfserr_resource:
1924                 nfserr = nfserr_toosmall;
1925                 goto fail;
1926         case nfserr_dropit:
1927                 goto fail;
1928         default:
1929                 /*
1930                  * If the client requested the RDATTR_ERROR attribute,
1931                  * we stuff the error code into this attribute
1932                  * and continue.  If this attribute was not requested,
1933                  * then in accordance with the spec, we fail the
1934                  * entire READDIR operation(!)
1935                  */
1936                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1937                         goto fail;
1938                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1939                 if (p == NULL) {
1940                         nfserr = nfserr_toosmall;
1941                         goto fail;
1942                 }
1943         }
1944         cd->buflen -= (p - cd->buffer);
1945         cd->buffer = p;
1946         cd->common.err = nfs_ok;
1947         return 0;
1948 fail:
1949         cd->common.err = nfserr;
1950         return -EINVAL;
1951 }
1952
1953 static void
1954 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
1955 {
1956         ENCODE_HEAD;
1957
1958         RESERVE_SPACE(sizeof(stateid_t));
1959         WRITE32(sid->si_generation);
1960         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
1961         ADJUST_ARGS();
1962 }
1963
1964 static __be32
1965 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1966 {
1967         ENCODE_HEAD;
1968
1969         if (!nfserr) {
1970                 RESERVE_SPACE(8);
1971                 WRITE32(access->ac_supported);
1972                 WRITE32(access->ac_resp_access);
1973                 ADJUST_ARGS();
1974         }
1975         return nfserr;
1976 }
1977
1978 static __be32
1979 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1980 {
1981         ENCODE_SEQID_OP_HEAD;
1982
1983         if (!nfserr)
1984                 nfsd4_encode_stateid(resp, &close->cl_stateid);
1985
1986         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1987         return nfserr;
1988 }
1989
1990
1991 static __be32
1992 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
1993 {
1994         ENCODE_HEAD;
1995
1996         if (!nfserr) {
1997                 RESERVE_SPACE(8);
1998                 WRITEMEM(commit->co_verf.data, 8);
1999                 ADJUST_ARGS();
2000         }
2001         return nfserr;
2002 }
2003
2004 static __be32
2005 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2006 {
2007         ENCODE_HEAD;
2008
2009         if (!nfserr) {
2010                 RESERVE_SPACE(32);
2011                 WRITECINFO(create->cr_cinfo);
2012                 WRITE32(2);
2013                 WRITE32(create->cr_bmval[0]);
2014                 WRITE32(create->cr_bmval[1]);
2015                 ADJUST_ARGS();
2016         }
2017         return nfserr;
2018 }
2019
2020 static __be32
2021 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2022 {
2023         struct svc_fh *fhp = getattr->ga_fhp;
2024         int buflen;
2025
2026         if (nfserr)
2027                 return nfserr;
2028
2029         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2030         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2031                                     resp->p, &buflen, getattr->ga_bmval,
2032                                     resp->rqstp, 0);
2033         if (!nfserr)
2034                 resp->p += buflen;
2035         return nfserr;
2036 }
2037
2038 static __be32
2039 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2040 {
2041         struct svc_fh *fhp = *fhpp;
2042         unsigned int len;
2043         ENCODE_HEAD;
2044
2045         if (!nfserr) {
2046                 len = fhp->fh_handle.fh_size;
2047                 RESERVE_SPACE(len + 4);
2048                 WRITE32(len);
2049                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2050                 ADJUST_ARGS();
2051         }
2052         return nfserr;
2053 }
2054
2055 /*
2056 * Including all fields other than the name, a LOCK4denied structure requires
2057 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2058 */
2059 static void
2060 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2061 {
2062         ENCODE_HEAD;
2063
2064         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2065         WRITE64(ld->ld_start);
2066         WRITE64(ld->ld_length);
2067         WRITE32(ld->ld_type);
2068         if (ld->ld_sop) {
2069                 WRITEMEM(&ld->ld_clientid, 8);
2070                 WRITE32(ld->ld_sop->so_owner.len);
2071                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2072                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2073         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2074                 WRITE64((u64)0); /* clientid */
2075                 WRITE32(0); /* length of owner name */
2076         }
2077         ADJUST_ARGS();
2078 }
2079
2080 static __be32
2081 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2082 {
2083         ENCODE_SEQID_OP_HEAD;
2084
2085         if (!nfserr)
2086                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2087         else if (nfserr == nfserr_denied)
2088                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2089
2090         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2091         return nfserr;
2092 }
2093
2094 static __be32
2095 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2096 {
2097         if (nfserr == nfserr_denied)
2098                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2099         return nfserr;
2100 }
2101
2102 static __be32
2103 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2104 {
2105         ENCODE_SEQID_OP_HEAD;
2106
2107         if (!nfserr)
2108                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2109
2110         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2111         return nfserr;
2112 }
2113
2114
2115 static __be32
2116 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2117 {
2118         ENCODE_HEAD;
2119
2120         if (!nfserr) {
2121                 RESERVE_SPACE(20);
2122                 WRITECINFO(link->li_cinfo);
2123                 ADJUST_ARGS();
2124         }
2125         return nfserr;
2126 }
2127
2128
2129 static __be32
2130 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2131 {
2132         ENCODE_SEQID_OP_HEAD;
2133
2134         if (nfserr)
2135                 goto out;
2136
2137         nfsd4_encode_stateid(resp, &open->op_stateid);
2138         RESERVE_SPACE(40);
2139         WRITECINFO(open->op_cinfo);
2140         WRITE32(open->op_rflags);
2141         WRITE32(2);
2142         WRITE32(open->op_bmval[0]);
2143         WRITE32(open->op_bmval[1]);
2144         WRITE32(open->op_delegate_type);
2145         ADJUST_ARGS();
2146
2147         switch (open->op_delegate_type) {
2148         case NFS4_OPEN_DELEGATE_NONE:
2149                 break;
2150         case NFS4_OPEN_DELEGATE_READ:
2151                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2152                 RESERVE_SPACE(20);
2153                 WRITE32(open->op_recall);
2154
2155                 /*
2156                  * TODO: ACE's in delegations
2157                  */
2158                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2159                 WRITE32(0);
2160                 WRITE32(0);
2161                 WRITE32(0);   /* XXX: is NULL principal ok? */
2162                 ADJUST_ARGS();
2163                 break;
2164         case NFS4_OPEN_DELEGATE_WRITE:
2165                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2166                 RESERVE_SPACE(32);
2167                 WRITE32(0);
2168
2169                 /*
2170                  * TODO: space_limit's in delegations
2171                  */
2172                 WRITE32(NFS4_LIMIT_SIZE);
2173                 WRITE32(~(u32)0);
2174                 WRITE32(~(u32)0);
2175
2176                 /*
2177                  * TODO: ACE's in delegations
2178                  */
2179                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2180                 WRITE32(0);
2181                 WRITE32(0);
2182                 WRITE32(0);   /* XXX: is NULL principal ok? */
2183                 ADJUST_ARGS();
2184                 break;
2185         default:
2186                 BUG();
2187         }
2188         /* XXX save filehandle here */
2189 out:
2190         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2191         return nfserr;
2192 }
2193
2194 static __be32
2195 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2196 {
2197         ENCODE_SEQID_OP_HEAD;
2198
2199         if (!nfserr)
2200                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2201
2202         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2203         return nfserr;
2204 }
2205
2206 static __be32
2207 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2208 {
2209         ENCODE_SEQID_OP_HEAD;
2210
2211         if (!nfserr)
2212                 nfsd4_encode_stateid(resp, &od->od_stateid);
2213
2214         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2215         return nfserr;
2216 }
2217
2218 static __be32
2219 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2220                   struct nfsd4_read *read)
2221 {
2222         u32 eof;
2223         int v, pn;
2224         unsigned long maxcount;
2225         long len;
2226         ENCODE_HEAD;
2227
2228         if (nfserr)
2229                 return nfserr;
2230         if (resp->xbuf->page_len)
2231                 return nfserr_resource;
2232
2233         RESERVE_SPACE(8); /* eof flag and byte count */
2234
2235         maxcount = svc_max_payload(resp->rqstp);
2236         if (maxcount > read->rd_length)
2237                 maxcount = read->rd_length;
2238
2239         len = maxcount;
2240         v = 0;
2241         while (len > 0) {
2242                 pn = resp->rqstp->rq_resused++;
2243                 resp->rqstp->rq_vec[v].iov_base =
2244                         page_address(resp->rqstp->rq_respages[pn]);
2245                 resp->rqstp->rq_vec[v].iov_len =
2246                         len < PAGE_SIZE ? len : PAGE_SIZE;
2247                 v++;
2248                 len -= PAGE_SIZE;
2249         }
2250         read->rd_vlen = v;
2251
2252         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2253                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2254                         &maxcount);
2255
2256         if (nfserr == nfserr_symlink)
2257                 nfserr = nfserr_inval;
2258         if (nfserr)
2259                 return nfserr;
2260         eof = (read->rd_offset + maxcount >=
2261                read->rd_fhp->fh_dentry->d_inode->i_size);
2262
2263         WRITE32(eof);
2264         WRITE32(maxcount);
2265         ADJUST_ARGS();
2266         resp->xbuf->head[0].iov_len = (char*)p
2267                                         - (char*)resp->xbuf->head[0].iov_base;
2268         resp->xbuf->page_len = maxcount;
2269
2270         /* Use rest of head for padding and remaining ops: */
2271         resp->xbuf->tail[0].iov_base = p;
2272         resp->xbuf->tail[0].iov_len = 0;
2273         if (maxcount&3) {
2274                 RESERVE_SPACE(4);
2275                 WRITE32(0);
2276                 resp->xbuf->tail[0].iov_base += maxcount&3;
2277                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2278                 ADJUST_ARGS();
2279         }
2280         return 0;
2281 }
2282
2283 static __be32
2284 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2285 {
2286         int maxcount;
2287         char *page;
2288         ENCODE_HEAD;
2289
2290         if (nfserr)
2291                 return nfserr;
2292         if (resp->xbuf->page_len)
2293                 return nfserr_resource;
2294
2295         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2296
2297         maxcount = PAGE_SIZE;
2298         RESERVE_SPACE(4);
2299
2300         /*
2301          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2302          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2303          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2304          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2305          */
2306         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2307         if (nfserr == nfserr_isdir)
2308                 return nfserr_inval;
2309         if (nfserr)
2310                 return nfserr;
2311
2312         WRITE32(maxcount);
2313         ADJUST_ARGS();
2314         resp->xbuf->head[0].iov_len = (char*)p
2315                                 - (char*)resp->xbuf->head[0].iov_base;
2316         resp->xbuf->page_len = maxcount;
2317
2318         /* Use rest of head for padding and remaining ops: */
2319         resp->xbuf->tail[0].iov_base = p;
2320         resp->xbuf->tail[0].iov_len = 0;
2321         if (maxcount&3) {
2322                 RESERVE_SPACE(4);
2323                 WRITE32(0);
2324                 resp->xbuf->tail[0].iov_base += maxcount&3;
2325                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2326                 ADJUST_ARGS();
2327         }
2328         return 0;
2329 }
2330
2331 static __be32
2332 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2333 {
2334         int maxcount;
2335         loff_t offset;
2336         __be32 *page, *savep, *tailbase;
2337         ENCODE_HEAD;
2338
2339         if (nfserr)
2340                 return nfserr;
2341         if (resp->xbuf->page_len)
2342                 return nfserr_resource;
2343
2344         RESERVE_SPACE(8);  /* verifier */
2345         savep = p;
2346
2347         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2348         WRITE32(0);
2349         WRITE32(0);
2350         ADJUST_ARGS();
2351         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2352         tailbase = p;
2353
2354         maxcount = PAGE_SIZE;
2355         if (maxcount > readdir->rd_maxcount)
2356                 maxcount = readdir->rd_maxcount;
2357
2358         /*
2359          * Convert from bytes to words, account for the two words already
2360          * written, make sure to leave two words at the end for the next
2361          * pointer and eof field.
2362          */
2363         maxcount = (maxcount >> 2) - 4;
2364         if (maxcount < 0) {
2365                 nfserr =  nfserr_toosmall;
2366                 goto err_no_verf;
2367         }
2368
2369         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2370         readdir->common.err = 0;
2371         readdir->buflen = maxcount;
2372         readdir->buffer = page;
2373         readdir->offset = NULL;
2374
2375         offset = readdir->rd_cookie;
2376         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2377                               &offset,
2378                               &readdir->common, nfsd4_encode_dirent);
2379         if (nfserr == nfs_ok &&
2380             readdir->common.err == nfserr_toosmall &&
2381             readdir->buffer == page)
2382                 nfserr = nfserr_toosmall;
2383         if (nfserr == nfserr_symlink)
2384                 nfserr = nfserr_notdir;
2385         if (nfserr)
2386                 goto err_no_verf;
2387
2388         if (readdir->offset)
2389                 xdr_encode_hyper(readdir->offset, offset);
2390
2391         p = readdir->buffer;
2392         *p++ = 0;       /* no more entries */
2393         *p++ = htonl(readdir->common.err == nfserr_eof);
2394         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2395                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2396
2397         /* Use rest of head for padding and remaining ops: */
2398         resp->xbuf->tail[0].iov_base = tailbase;
2399         resp->xbuf->tail[0].iov_len = 0;
2400         resp->p = resp->xbuf->tail[0].iov_base;
2401         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2402
2403         return 0;
2404 err_no_verf:
2405         p = savep;
2406         ADJUST_ARGS();
2407         return nfserr;
2408 }
2409
2410 static __be32
2411 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2412 {
2413         ENCODE_HEAD;
2414
2415         if (!nfserr) {
2416                 RESERVE_SPACE(20);
2417                 WRITECINFO(remove->rm_cinfo);
2418                 ADJUST_ARGS();
2419         }
2420         return nfserr;
2421 }
2422
2423 static __be32
2424 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2425 {
2426         ENCODE_HEAD;
2427
2428         if (!nfserr) {
2429                 RESERVE_SPACE(40);
2430                 WRITECINFO(rename->rn_sinfo);
2431                 WRITECINFO(rename->rn_tinfo);
2432                 ADJUST_ARGS();
2433         }
2434         return nfserr;
2435 }
2436
2437 static __be32
2438 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2439                      struct nfsd4_secinfo *secinfo)
2440 {
2441         int i = 0;
2442         struct svc_export *exp = secinfo->si_exp;
2443         u32 nflavs;
2444         struct exp_flavor_info *flavs;
2445         struct exp_flavor_info def_flavs[2];
2446         ENCODE_HEAD;
2447
2448         if (nfserr)
2449                 goto out;
2450         if (exp->ex_nflavors) {
2451                 flavs = exp->ex_flavors;
2452                 nflavs = exp->ex_nflavors;
2453         } else { /* Handling of some defaults in absence of real secinfo: */
2454                 flavs = def_flavs;
2455                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2456                         nflavs = 2;
2457                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2458                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2459                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2460                         nflavs = 1;
2461                         flavs[0].pseudoflavor
2462                                         = svcauth_gss_flavor(exp->ex_client);
2463                 } else {
2464                         nflavs = 1;
2465                         flavs[0].pseudoflavor
2466                                         = exp->ex_client->flavour->flavour;
2467                 }
2468         }
2469
2470         RESERVE_SPACE(4);
2471         WRITE32(nflavs);
2472         ADJUST_ARGS();
2473         for (i = 0; i < nflavs; i++) {
2474                 u32 flav = flavs[i].pseudoflavor;
2475                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2476
2477                 if (gm) {
2478                         RESERVE_SPACE(4);
2479                         WRITE32(RPC_AUTH_GSS);
2480                         ADJUST_ARGS();
2481                         RESERVE_SPACE(4 + gm->gm_oid.len);
2482                         WRITE32(gm->gm_oid.len);
2483                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2484                         ADJUST_ARGS();
2485                         RESERVE_SPACE(4);
2486                         WRITE32(0); /* qop */
2487                         ADJUST_ARGS();
2488                         RESERVE_SPACE(4);
2489                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2490                         ADJUST_ARGS();
2491                         gss_mech_put(gm);
2492                 } else {
2493                         RESERVE_SPACE(4);
2494                         WRITE32(flav);
2495                         ADJUST_ARGS();
2496                 }
2497         }
2498 out:
2499         if (exp)
2500                 exp_put(exp);
2501         return nfserr;
2502 }
2503
2504 /*
2505  * The SETATTR encode routine is special -- it always encodes a bitmap,
2506  * regardless of the error status.
2507  */
2508 static __be32
2509 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2510 {
2511         ENCODE_HEAD;
2512
2513         RESERVE_SPACE(12);
2514         if (nfserr) {
2515                 WRITE32(2);
2516                 WRITE32(0);
2517                 WRITE32(0);
2518         }
2519         else {
2520                 WRITE32(2);
2521                 WRITE32(setattr->sa_bmval[0]);
2522                 WRITE32(setattr->sa_bmval[1]);
2523         }
2524         ADJUST_ARGS();
2525         return nfserr;
2526 }
2527
2528 static __be32
2529 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2530 {
2531         ENCODE_HEAD;
2532
2533         if (!nfserr) {
2534                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2535                 WRITEMEM(&scd->se_clientid, 8);
2536                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2537                 ADJUST_ARGS();
2538         }
2539         else if (nfserr == nfserr_clid_inuse) {
2540                 RESERVE_SPACE(8);
2541                 WRITE32(0);
2542                 WRITE32(0);
2543                 ADJUST_ARGS();
2544         }
2545         return nfserr;
2546 }
2547
2548 static __be32
2549 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2550 {
2551         ENCODE_HEAD;
2552
2553         if (!nfserr) {
2554                 RESERVE_SPACE(16);
2555                 WRITE32(write->wr_bytes_written);
2556                 WRITE32(write->wr_how_written);
2557                 WRITEMEM(write->wr_verifier.data, 8);
2558                 ADJUST_ARGS();
2559         }
2560         return nfserr;
2561 }
2562
2563 static __be32
2564 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
2565 {
2566         return nfserr;
2567 }
2568
2569 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
2570
2571 static nfsd4_enc nfsd4_enc_ops[] = {
2572         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
2573         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
2574         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
2575         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
2576         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
2577         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
2578         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
2579         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
2580         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
2581         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
2582         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
2583         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
2584         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
2585         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
2586         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
2587         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
2588         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
2589         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
2590         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
2591         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
2592         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
2593         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
2594         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
2595         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
2596         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
2597         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
2598         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
2599         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
2600         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
2601         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
2602         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
2603         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
2604         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
2605         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
2606         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
2607         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
2608 };
2609
2610 void
2611 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2612 {
2613         __be32 *statp;
2614         ENCODE_HEAD;
2615
2616         RESERVE_SPACE(8);
2617         WRITE32(op->opnum);
2618         statp = p++;    /* to be backfilled at the end */
2619         ADJUST_ARGS();
2620
2621         if (op->opnum == OP_ILLEGAL)
2622                 goto status;
2623         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
2624                !nfsd4_enc_ops[op->opnum]);
2625         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
2626 status:
2627         /*
2628          * Note: We write the status directly, instead of using WRITE32(),
2629          * since it is already in network byte order.
2630          */
2631         *statp = op->status;
2632 }
2633
2634 /*
2635  * Encode the reply stored in the stateowner reply cache
2636  *
2637  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2638  * previously sent already encoded operation.
2639  *
2640  * called with nfs4_lock_state() held
2641  */
2642 void
2643 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2644 {
2645         ENCODE_HEAD;
2646         struct nfs4_replay *rp = op->replay;
2647
2648         BUG_ON(!rp);
2649
2650         RESERVE_SPACE(8);
2651         WRITE32(op->opnum);
2652         *p++ = rp->rp_status;  /* already xdr'ed */
2653         ADJUST_ARGS();
2654
2655         RESERVE_SPACE(rp->rp_buflen);
2656         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2657         ADJUST_ARGS();
2658 }
2659
2660 /*
2661  * END OF "GENERIC" ENCODE ROUTINES.
2662  */
2663
2664 int
2665 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2666 {
2667         return xdr_ressize_check(rqstp, p);
2668 }
2669
2670 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2671 {
2672         if (args->ops != args->iops) {
2673                 kfree(args->ops);
2674                 args->ops = args->iops;
2675         }
2676         kfree(args->tmpp);
2677         args->tmpp = NULL;
2678         while (args->to_free) {
2679                 struct tmpbuf *tb = args->to_free;
2680                 args->to_free = tb->next;
2681                 tb->release(tb->buf);
2682                 kfree(tb);
2683         }
2684 }
2685
2686 int
2687 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2688 {
2689         __be32 status;
2690
2691         args->p = p;
2692         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2693         args->pagelist = rqstp->rq_arg.pages;
2694         args->pagelen = rqstp->rq_arg.page_len;
2695         args->tmpp = NULL;
2696         args->to_free = NULL;
2697         args->ops = args->iops;
2698         args->rqstp = rqstp;
2699
2700         status = nfsd4_decode_compound(args);
2701         if (status) {
2702                 nfsd4_release_compoundargs(args);
2703         }
2704         return !status;
2705 }
2706
2707 int
2708 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2709 {
2710         /*
2711          * All that remains is to write the tag and operation count...
2712          */
2713         struct kvec *iov;
2714         p = resp->tagp;
2715         *p++ = htonl(resp->taglen);
2716         memcpy(p, resp->tag, resp->taglen);
2717         p += XDR_QUADLEN(resp->taglen);
2718         *p++ = htonl(resp->opcnt);
2719
2720         if (rqstp->rq_res.page_len)
2721                 iov = &rqstp->rq_res.tail[0];
2722         else
2723                 iov = &rqstp->rq_res.head[0];
2724         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2725         BUG_ON(iov->iov_len > PAGE_SIZE);
2726         return 1;
2727 }
2728
2729 /*
2730  * Local variables:
2731  *  c-basic-offset: 8
2732  * End:
2733  */