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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 *save;                                           \
1187                                                                 \
1188         save = resp->p;
1189
1190 /*
1191  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1192  * is where sequence id's are incremented, and the replay cache is filled.
1193  * Note that we increment sequence id's here, at the last moment, so we're sure
1194  * we know whether the error to be returned is a sequence id mutating error.
1195  */
1196
1197 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1198         if (seqid_mutating_err(nfserr) && stateowner) {         \
1199                 stateowner->so_seqid++;                         \
1200                 stateowner->so_replay.rp_status = nfserr;       \
1201                 stateowner->so_replay.rp_buflen =               \
1202                           (((char *)(resp)->p - (char *)save)); \
1203                 memcpy(stateowner->so_replay.rp_buf, save,      \
1204                         stateowner->so_replay.rp_buflen);       \
1205         } } while (0);
1206
1207 /* Encode as an array of strings the string given with components
1208  * seperated @sep.
1209  */
1210 static __be32 nfsd4_encode_components(char sep, char *components,
1211                                    __be32 **pp, int *buflen)
1212 {
1213         __be32 *p = *pp;
1214         __be32 *countp = p;
1215         int strlen, count=0;
1216         char *str, *end;
1217
1218         dprintk("nfsd4_encode_components(%s)\n", components);
1219         if ((*buflen -= 4) < 0)
1220                 return nfserr_resource;
1221         WRITE32(0); /* We will fill this in with @count later */
1222         end = str = components;
1223         while (*end) {
1224                 for (; *end && (*end != sep); end++)
1225                         ; /* Point to end of component */
1226                 strlen = end - str;
1227                 if (strlen) {
1228                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1229                                 return nfserr_resource;
1230                         WRITE32(strlen);
1231                         WRITEMEM(str, strlen);
1232                         count++;
1233                 }
1234                 else
1235                         end++;
1236                 str = end;
1237         }
1238         *pp = p;
1239         p = countp;
1240         WRITE32(count);
1241         return 0;
1242 }
1243
1244 /*
1245  * encode a location element of a fs_locations structure
1246  */
1247 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1248                                     __be32 **pp, int *buflen)
1249 {
1250         __be32 status;
1251         __be32 *p = *pp;
1252
1253         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1254         if (status)
1255                 return status;
1256         status = nfsd4_encode_components('/', location->path, &p, buflen);
1257         if (status)
1258                 return status;
1259         *pp = p;
1260         return 0;
1261 }
1262
1263 /*
1264  * Return the path to an export point in the pseudo filesystem namespace
1265  * Returned string is safe to use as long as the caller holds a reference
1266  * to @exp.
1267  */
1268 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1269 {
1270         struct svc_fh tmp_fh;
1271         char *path, *rootpath;
1272
1273         fh_init(&tmp_fh, NFS4_FHSIZE);
1274         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1275         if (*stat)
1276                 return NULL;
1277         rootpath = tmp_fh.fh_export->ex_pathname;
1278
1279         path = exp->ex_pathname;
1280
1281         if (strncmp(path, rootpath, strlen(rootpath))) {
1282                 dprintk("nfsd: fs_locations failed;"
1283                         "%s is not contained in %s\n", path, rootpath);
1284                 *stat = nfserr_notsupp;
1285                 return NULL;
1286         }
1287
1288         return path + strlen(rootpath);
1289 }
1290
1291 /*
1292  *  encode a fs_locations structure
1293  */
1294 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1295                                      struct svc_export *exp,
1296                                      __be32 **pp, int *buflen)
1297 {
1298         __be32 status;
1299         int i;
1300         __be32 *p = *pp;
1301         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1302         char *root = nfsd4_path(rqstp, exp, &status);
1303
1304         if (status)
1305                 return status;
1306         status = nfsd4_encode_components('/', root, &p, buflen);
1307         if (status)
1308                 return status;
1309         if ((*buflen -= 4) < 0)
1310                 return nfserr_resource;
1311         WRITE32(fslocs->locations_count);
1312         for (i=0; i<fslocs->locations_count; i++) {
1313                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1314                                                    &p, buflen);
1315                 if (status)
1316                         return status;
1317         }
1318         *pp = p;
1319         return 0;
1320 }
1321
1322 static u32 nfs4_ftypes[16] = {
1323         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1324         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1325         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1326         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1327 };
1328
1329 static __be32
1330 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1331                         __be32 **p, int *buflen)
1332 {
1333         int status;
1334
1335         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1336                 return nfserr_resource;
1337         if (whotype != NFS4_ACL_WHO_NAMED)
1338                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1339         else if (group)
1340                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1341         else
1342                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1343         if (status < 0)
1344                 return nfserrno(status);
1345         *p = xdr_encode_opaque(*p, NULL, status);
1346         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1347         BUG_ON(*buflen < 0);
1348         return 0;
1349 }
1350
1351 static inline __be32
1352 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1353 {
1354         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1355 }
1356
1357 static inline __be32
1358 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1359 {
1360         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1361 }
1362
1363 static inline __be32
1364 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1365                 __be32 **p, int *buflen)
1366 {
1367         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1368 }
1369
1370 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1371                               FATTR4_WORD0_RDATTR_ERROR)
1372 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1373
1374 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1375 {
1376         /* As per referral draft:  */
1377         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1378             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1379                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1380                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1381                         *rdattr_err = NFSERR_MOVED;
1382                 else
1383                         return nfserr_moved;
1384         }
1385         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1386         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1387         return 0;
1388 }
1389
1390 /*
1391  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1392  * ourselves.
1393  *
1394  * @countp is the buffer size in _words_; upon successful return this becomes
1395  * replaced with the number of words written.
1396  */
1397 __be32
1398 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1399                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1400                 struct svc_rqst *rqstp, int ignore_crossmnt)
1401 {
1402         u32 bmval0 = bmval[0];
1403         u32 bmval1 = bmval[1];
1404         struct kstat stat;
1405         struct svc_fh tempfh;
1406         struct kstatfs statfs;
1407         int buflen = *countp << 2;
1408         __be32 *attrlenp;
1409         u32 dummy;
1410         u64 dummy64;
1411         u32 rdattr_err = 0;
1412         __be32 *p = buffer;
1413         __be32 status;
1414         int err;
1415         int aclsupport = 0;
1416         struct nfs4_acl *acl = NULL;
1417
1418         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1419         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1420         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1421
1422         if (exp->ex_fslocs.migrated) {
1423                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1424                 if (status)
1425                         goto out;
1426         }
1427
1428         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1429         if (err)
1430                 goto out_nfserr;
1431         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1432                         FATTR4_WORD0_MAXNAME)) ||
1433             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1434                        FATTR4_WORD1_SPACE_TOTAL))) {
1435                 err = vfs_statfs(dentry, &statfs);
1436                 if (err)
1437                         goto out_nfserr;
1438         }
1439         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1440                 fh_init(&tempfh, NFS4_FHSIZE);
1441                 status = fh_compose(&tempfh, exp, dentry, NULL);
1442                 if (status)
1443                         goto out;
1444                 fhp = &tempfh;
1445         }
1446         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1447                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1448                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1449                 aclsupport = (err == 0);
1450                 if (bmval0 & FATTR4_WORD0_ACL) {
1451                         if (err == -EOPNOTSUPP)
1452                                 bmval0 &= ~FATTR4_WORD0_ACL;
1453                         else if (err == -EINVAL) {
1454                                 status = nfserr_attrnotsupp;
1455                                 goto out;
1456                         } else if (err != 0)
1457                                 goto out_nfserr;
1458                 }
1459         }
1460         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1461                 if (exp->ex_fslocs.locations == NULL) {
1462                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1463                 }
1464         }
1465         if ((buflen -= 16) < 0)
1466                 goto out_resource;
1467
1468         WRITE32(2);
1469         WRITE32(bmval0);
1470         WRITE32(bmval1);
1471         attrlenp = p++;                /* to be backfilled later */
1472
1473         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1474                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1475                 if ((buflen -= 12) < 0)
1476                         goto out_resource;
1477                 if (!aclsupport)
1478                         word0 &= ~FATTR4_WORD0_ACL;
1479                 if (!exp->ex_fslocs.locations)
1480                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1481                 WRITE32(2);
1482                 WRITE32(word0);
1483                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1484         }
1485         if (bmval0 & FATTR4_WORD0_TYPE) {
1486                 if ((buflen -= 4) < 0)
1487                         goto out_resource;
1488                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1489                 if (dummy == NF4BAD)
1490                         goto out_serverfault;
1491                 WRITE32(dummy);
1492         }
1493         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1494                 if ((buflen -= 4) < 0)
1495                         goto out_resource;
1496                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1497                         WRITE32(NFS4_FH_PERSISTENT);
1498                 else
1499                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1500         }
1501         if (bmval0 & FATTR4_WORD0_CHANGE) {
1502                 /*
1503                  * Note: This _must_ be consistent with the scheme for writing
1504                  * change_info, so any changes made here must be reflected there
1505                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1506                  * macro above.)
1507                  */
1508                 if ((buflen -= 8) < 0)
1509                         goto out_resource;
1510                 WRITE32(stat.ctime.tv_sec);
1511                 WRITE32(stat.ctime.tv_nsec);
1512         }
1513         if (bmval0 & FATTR4_WORD0_SIZE) {
1514                 if ((buflen -= 8) < 0)
1515                         goto out_resource;
1516                 WRITE64(stat.size);
1517         }
1518         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1519                 if ((buflen -= 4) < 0)
1520                         goto out_resource;
1521                 WRITE32(1);
1522         }
1523         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1524                 if ((buflen -= 4) < 0)
1525                         goto out_resource;
1526                 WRITE32(1);
1527         }
1528         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1529                 if ((buflen -= 4) < 0)
1530                         goto out_resource;
1531                 WRITE32(0);
1532         }
1533         if (bmval0 & FATTR4_WORD0_FSID) {
1534                 if ((buflen -= 16) < 0)
1535                         goto out_resource;
1536                 if (exp->ex_fslocs.migrated) {
1537                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1538                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1539                 } else switch(fsid_source(fhp)) {
1540                 case FSIDSOURCE_FSID:
1541                         WRITE64((u64)exp->ex_fsid);
1542                         WRITE64((u64)0);
1543                         break;
1544                 case FSIDSOURCE_DEV:
1545                         WRITE32(0);
1546                         WRITE32(MAJOR(stat.dev));
1547                         WRITE32(0);
1548                         WRITE32(MINOR(stat.dev));
1549                         break;
1550                 case FSIDSOURCE_UUID:
1551                         WRITEMEM(exp->ex_uuid, 16);
1552                         break;
1553                 }
1554         }
1555         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1556                 if ((buflen -= 4) < 0)
1557                         goto out_resource;
1558                 WRITE32(0);
1559         }
1560         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1561                 if ((buflen -= 4) < 0)
1562                         goto out_resource;
1563                 WRITE32(NFSD_LEASE_TIME);
1564         }
1565         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1566                 if ((buflen -= 4) < 0)
1567                         goto out_resource;
1568                 WRITE32(rdattr_err);
1569         }
1570         if (bmval0 & FATTR4_WORD0_ACL) {
1571                 struct nfs4_ace *ace;
1572
1573                 if (acl == NULL) {
1574                         if ((buflen -= 4) < 0)
1575                                 goto out_resource;
1576
1577                         WRITE32(0);
1578                         goto out_acl;
1579                 }
1580                 if ((buflen -= 4) < 0)
1581                         goto out_resource;
1582                 WRITE32(acl->naces);
1583
1584                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1585                         if ((buflen -= 4*3) < 0)
1586                                 goto out_resource;
1587                         WRITE32(ace->type);
1588                         WRITE32(ace->flag);
1589                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1590                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1591                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1592                                 &p, &buflen);
1593                         if (status == nfserr_resource)
1594                                 goto out_resource;
1595                         if (status)
1596                                 goto out;
1597                 }
1598         }
1599 out_acl:
1600         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1601                 if ((buflen -= 4) < 0)
1602                         goto out_resource;
1603                 WRITE32(aclsupport ?
1604                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1605         }
1606         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1607                 if ((buflen -= 4) < 0)
1608                         goto out_resource;
1609                 WRITE32(1);
1610         }
1611         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1612                 if ((buflen -= 4) < 0)
1613                         goto out_resource;
1614                 WRITE32(1);
1615         }
1616         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1617                 if ((buflen -= 4) < 0)
1618                         goto out_resource;
1619                 WRITE32(1);
1620         }
1621         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1622                 if ((buflen -= 4) < 0)
1623                         goto out_resource;
1624                 WRITE32(1);
1625         }
1626         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1627                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1628                 if (buflen < 0)
1629                         goto out_resource;
1630                 WRITE32(fhp->fh_handle.fh_size);
1631                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1632         }
1633         if (bmval0 & FATTR4_WORD0_FILEID) {
1634                 if ((buflen -= 8) < 0)
1635                         goto out_resource;
1636                 WRITE64(stat.ino);
1637         }
1638         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1639                 if ((buflen -= 8) < 0)
1640                         goto out_resource;
1641                 WRITE64((u64) statfs.f_ffree);
1642         }
1643         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1644                 if ((buflen -= 8) < 0)
1645                         goto out_resource;
1646                 WRITE64((u64) statfs.f_ffree);
1647         }
1648         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1649                 if ((buflen -= 8) < 0)
1650                         goto out_resource;
1651                 WRITE64((u64) statfs.f_files);
1652         }
1653         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1654                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1655                 if (status == nfserr_resource)
1656                         goto out_resource;
1657                 if (status)
1658                         goto out;
1659         }
1660         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1661                 if ((buflen -= 4) < 0)
1662                         goto out_resource;
1663                 WRITE32(1);
1664         }
1665         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1666                 if ((buflen -= 8) < 0)
1667                         goto out_resource;
1668                 WRITE64(~(u64)0);
1669         }
1670         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1671                 if ((buflen -= 4) < 0)
1672                         goto out_resource;
1673                 WRITE32(255);
1674         }
1675         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1676                 if ((buflen -= 4) < 0)
1677                         goto out_resource;
1678                 WRITE32(statfs.f_namelen);
1679         }
1680         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1681                 if ((buflen -= 8) < 0)
1682                         goto out_resource;
1683                 WRITE64((u64) svc_max_payload(rqstp));
1684         }
1685         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1686                 if ((buflen -= 8) < 0)
1687                         goto out_resource;
1688                 WRITE64((u64) svc_max_payload(rqstp));
1689         }
1690         if (bmval1 & FATTR4_WORD1_MODE) {
1691                 if ((buflen -= 4) < 0)
1692                         goto out_resource;
1693                 WRITE32(stat.mode & S_IALLUGO);
1694         }
1695         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1696                 if ((buflen -= 4) < 0)
1697                         goto out_resource;
1698                 WRITE32(1);
1699         }
1700         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1701                 if ((buflen -= 4) < 0)
1702                         goto out_resource;
1703                 WRITE32(stat.nlink);
1704         }
1705         if (bmval1 & FATTR4_WORD1_OWNER) {
1706                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1707                 if (status == nfserr_resource)
1708                         goto out_resource;
1709                 if (status)
1710                         goto out;
1711         }
1712         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1713                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1714                 if (status == nfserr_resource)
1715                         goto out_resource;
1716                 if (status)
1717                         goto out;
1718         }
1719         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1720                 if ((buflen -= 8) < 0)
1721                         goto out_resource;
1722                 WRITE32((u32) MAJOR(stat.rdev));
1723                 WRITE32((u32) MINOR(stat.rdev));
1724         }
1725         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1726                 if ((buflen -= 8) < 0)
1727                         goto out_resource;
1728                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1729                 WRITE64(dummy64);
1730         }
1731         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1732                 if ((buflen -= 8) < 0)
1733                         goto out_resource;
1734                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1735                 WRITE64(dummy64);
1736         }
1737         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1738                 if ((buflen -= 8) < 0)
1739                         goto out_resource;
1740                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1741                 WRITE64(dummy64);
1742         }
1743         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1744                 if ((buflen -= 8) < 0)
1745                         goto out_resource;
1746                 dummy64 = (u64)stat.blocks << 9;
1747                 WRITE64(dummy64);
1748         }
1749         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1750                 if ((buflen -= 12) < 0)
1751                         goto out_resource;
1752                 WRITE32(0);
1753                 WRITE32(stat.atime.tv_sec);
1754                 WRITE32(stat.atime.tv_nsec);
1755         }
1756         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1757                 if ((buflen -= 12) < 0)
1758                         goto out_resource;
1759                 WRITE32(0);
1760                 WRITE32(1);
1761                 WRITE32(0);
1762         }
1763         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1764                 if ((buflen -= 12) < 0)
1765                         goto out_resource;
1766                 WRITE32(0);
1767                 WRITE32(stat.ctime.tv_sec);
1768                 WRITE32(stat.ctime.tv_nsec);
1769         }
1770         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1771                 if ((buflen -= 12) < 0)
1772                         goto out_resource;
1773                 WRITE32(0);
1774                 WRITE32(stat.mtime.tv_sec);
1775                 WRITE32(stat.mtime.tv_nsec);
1776         }
1777         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1778                 if ((buflen -= 8) < 0)
1779                         goto out_resource;
1780                 /*
1781                  * Get parent's attributes if not ignoring crossmount
1782                  * and this is the root of a cross-mounted filesystem.
1783                  */
1784                 if (ignore_crossmnt == 0 &&
1785                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
1786                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
1787                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
1788                         if (err)
1789                                 goto out_nfserr;
1790                 }
1791                 WRITE64(stat.ino);
1792         }
1793         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1794         *countp = p - buffer;
1795         status = nfs_ok;
1796
1797 out:
1798         kfree(acl);
1799         if (fhp == &tempfh)
1800                 fh_put(&tempfh);
1801         return status;
1802 out_nfserr:
1803         status = nfserrno(err);
1804         goto out;
1805 out_resource:
1806         *countp = 0;
1807         status = nfserr_resource;
1808         goto out;
1809 out_serverfault:
1810         status = nfserr_serverfault;
1811         goto out;
1812 }
1813
1814 static inline int attributes_need_mount(u32 *bmval)
1815 {
1816         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
1817                 return 1;
1818         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
1819                 return 1;
1820         return 0;
1821 }
1822
1823 static __be32
1824 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1825                 const char *name, int namlen, __be32 *p, int *buflen)
1826 {
1827         struct svc_export *exp = cd->rd_fhp->fh_export;
1828         struct dentry *dentry;
1829         __be32 nfserr;
1830         int ignore_crossmnt = 0;
1831
1832         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1833         if (IS_ERR(dentry))
1834                 return nfserrno(PTR_ERR(dentry));
1835
1836         exp_get(exp);
1837         /*
1838          * In the case of a mountpoint, the client may be asking for
1839          * attributes that are only properties of the underlying filesystem
1840          * as opposed to the cross-mounted file system. In such a case,
1841          * we will not follow the cross mount and will fill the attribtutes
1842          * directly from the mountpoint dentry.
1843          */
1844         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
1845                 ignore_crossmnt = 1;
1846         else if (d_mountpoint(dentry)) {
1847                 int err;
1848
1849                 /*
1850                  * Why the heck aren't we just using nfsd_lookup??
1851                  * Different "."/".." handling?  Something else?
1852                  * At least, add a comment here to explain....
1853                  */
1854                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1855                 if (err) {
1856                         nfserr = nfserrno(err);
1857                         goto out_put;
1858                 }
1859                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
1860                 if (nfserr)
1861                         goto out_put;
1862
1863         }
1864         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1865                                         cd->rd_rqstp, ignore_crossmnt);
1866 out_put:
1867         dput(dentry);
1868         exp_put(exp);
1869         return nfserr;
1870 }
1871
1872 static __be32 *
1873 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1874 {
1875         __be32 *attrlenp;
1876
1877         if (buflen < 6)
1878                 return NULL;
1879         *p++ = htonl(2);
1880         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1881         *p++ = htonl(0);                         /* bmval1 */
1882
1883         attrlenp = p++;
1884         *p++ = nfserr;       /* no htonl */
1885         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1886         return p;
1887 }
1888
1889 static int
1890 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1891                     loff_t offset, u64 ino, unsigned int d_type)
1892 {
1893         struct readdir_cd *ccd = ccdv;
1894         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1895         int buflen;
1896         __be32 *p = cd->buffer;
1897         __be32 nfserr = nfserr_toosmall;
1898
1899         /* In nfsv4, "." and ".." never make it onto the wire.. */
1900         if (name && isdotent(name, namlen)) {
1901                 cd->common.err = nfs_ok;
1902                 return 0;
1903         }
1904
1905         if (cd->offset)
1906                 xdr_encode_hyper(cd->offset, (u64) offset);
1907
1908         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1909         if (buflen < 0)
1910                 goto fail;
1911
1912         *p++ = xdr_one;                             /* mark entry present */
1913         cd->offset = p;                             /* remember pointer */
1914         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1915         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1916
1917         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1918         switch (nfserr) {
1919         case nfs_ok:
1920                 p += buflen;
1921                 break;
1922         case nfserr_resource:
1923                 nfserr = nfserr_toosmall;
1924                 goto fail;
1925         case nfserr_dropit:
1926                 goto fail;
1927         default:
1928                 /*
1929                  * If the client requested the RDATTR_ERROR attribute,
1930                  * we stuff the error code into this attribute
1931                  * and continue.  If this attribute was not requested,
1932                  * then in accordance with the spec, we fail the
1933                  * entire READDIR operation(!)
1934                  */
1935                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1936                         goto fail;
1937                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1938                 if (p == NULL) {
1939                         nfserr = nfserr_toosmall;
1940                         goto fail;
1941                 }
1942         }
1943         cd->buflen -= (p - cd->buffer);
1944         cd->buffer = p;
1945         cd->common.err = nfs_ok;
1946         return 0;
1947 fail:
1948         cd->common.err = nfserr;
1949         return -EINVAL;
1950 }
1951
1952 static void
1953 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
1954 {
1955         ENCODE_HEAD;
1956
1957         RESERVE_SPACE(sizeof(stateid_t));
1958         WRITE32(sid->si_generation);
1959         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
1960         ADJUST_ARGS();
1961 }
1962
1963 static __be32
1964 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1965 {
1966         ENCODE_HEAD;
1967
1968         if (!nfserr) {
1969                 RESERVE_SPACE(8);
1970                 WRITE32(access->ac_supported);
1971                 WRITE32(access->ac_resp_access);
1972                 ADJUST_ARGS();
1973         }
1974         return nfserr;
1975 }
1976
1977 static __be32
1978 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1979 {
1980         ENCODE_SEQID_OP_HEAD;
1981
1982         if (!nfserr)
1983                 nfsd4_encode_stateid(resp, &close->cl_stateid);
1984
1985         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1986         return nfserr;
1987 }
1988
1989
1990 static __be32
1991 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
1992 {
1993         ENCODE_HEAD;
1994
1995         if (!nfserr) {
1996                 RESERVE_SPACE(8);
1997                 WRITEMEM(commit->co_verf.data, 8);
1998                 ADJUST_ARGS();
1999         }
2000         return nfserr;
2001 }
2002
2003 static __be32
2004 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2005 {
2006         ENCODE_HEAD;
2007
2008         if (!nfserr) {
2009                 RESERVE_SPACE(32);
2010                 WRITECINFO(create->cr_cinfo);
2011                 WRITE32(2);
2012                 WRITE32(create->cr_bmval[0]);
2013                 WRITE32(create->cr_bmval[1]);
2014                 ADJUST_ARGS();
2015         }
2016         return nfserr;
2017 }
2018
2019 static __be32
2020 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2021 {
2022         struct svc_fh *fhp = getattr->ga_fhp;
2023         int buflen;
2024
2025         if (nfserr)
2026                 return nfserr;
2027
2028         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2029         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2030                                     resp->p, &buflen, getattr->ga_bmval,
2031                                     resp->rqstp, 0);
2032         if (!nfserr)
2033                 resp->p += buflen;
2034         return nfserr;
2035 }
2036
2037 static __be32
2038 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2039 {
2040         struct svc_fh *fhp = *fhpp;
2041         unsigned int len;
2042         ENCODE_HEAD;
2043
2044         if (!nfserr) {
2045                 len = fhp->fh_handle.fh_size;
2046                 RESERVE_SPACE(len + 4);
2047                 WRITE32(len);
2048                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2049                 ADJUST_ARGS();
2050         }
2051         return nfserr;
2052 }
2053
2054 /*
2055 * Including all fields other than the name, a LOCK4denied structure requires
2056 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2057 */
2058 static void
2059 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2060 {
2061         ENCODE_HEAD;
2062
2063         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2064         WRITE64(ld->ld_start);
2065         WRITE64(ld->ld_length);
2066         WRITE32(ld->ld_type);
2067         if (ld->ld_sop) {
2068                 WRITEMEM(&ld->ld_clientid, 8);
2069                 WRITE32(ld->ld_sop->so_owner.len);
2070                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2071                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2072         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2073                 WRITE64((u64)0); /* clientid */
2074                 WRITE32(0); /* length of owner name */
2075         }
2076         ADJUST_ARGS();
2077 }
2078
2079 static __be32
2080 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2081 {
2082         ENCODE_SEQID_OP_HEAD;
2083
2084         if (!nfserr)
2085                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2086         else if (nfserr == nfserr_denied)
2087                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2088
2089         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2090         return nfserr;
2091 }
2092
2093 static __be32
2094 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2095 {
2096         if (nfserr == nfserr_denied)
2097                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2098         return nfserr;
2099 }
2100
2101 static __be32
2102 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2103 {
2104         ENCODE_SEQID_OP_HEAD;
2105
2106         if (!nfserr)
2107                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2108
2109         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2110         return nfserr;
2111 }
2112
2113
2114 static __be32
2115 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2116 {
2117         ENCODE_HEAD;
2118
2119         if (!nfserr) {
2120                 RESERVE_SPACE(20);
2121                 WRITECINFO(link->li_cinfo);
2122                 ADJUST_ARGS();
2123         }
2124         return nfserr;
2125 }
2126
2127
2128 static __be32
2129 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2130 {
2131         ENCODE_HEAD;
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  */