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   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * TODO: Neil Brown made the following observation:  We currently
  36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37  * never release any of that until the request is complete.
  38  * It would be good to calculate a new maximum response size while
  39  * decoding the COMPOUND, and call svc_reserve with this number
  40  * at the end of nfs4svc_decode_compoundargs.
  41  */
  42
  43 #include <linux/param.h>
  44 #include <linux/smp.h>
  45 #include <linux/fs.h>
  46 #include <linux/namei.h>
  47 #include <linux/vfs.h>
  48 #include <linux/utsname.h>
  49 #include <linux/sunrpc/xdr.h>
  50 #include <linux/sunrpc/svc.h>
  51 #include <linux/sunrpc/clnt.h>
  52 #include <linux/nfsd/nfsd.h>
  53 #include <linux/nfsd/state.h>
  54 #include <linux/nfsd/xdr4.h>
  55 #include <linux/nfsd_idmap.h>
  56 #include <linux/nfs4.h>
  57 #include <linux/nfs4_acl.h>
  58 #include <linux/sunrpc/gss_api.h>
  59 #include <linux/sunrpc/svcauth_gss.h>
  60
  61 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  62
  63 /*
  64  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  65  * directory in order to indicate to the client that a filesystem boundary is present
  66  * We use a fixed fsid for a referral
  67  */
  68 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  69 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  70
  71 static __be32
  72 check_filename(char *str, int len, __be32 err)
  73 {
  74         int i;
  75
  76         if (len == 0)
  77                 return nfserr_inval;
  78         if (isdotent(str, len))
  79                 return err;
  80         for (i = 0; i < len; i++)
  81                 if (str[i] == '/')
  82                         return err;
  83         return 0;
  84 }
  85
  86 /*
  87  * START OF "GENERIC" DECODE ROUTINES.
  88  *   These may look a little ugly since they are imported from a "generic"
  89  * set of XDR encode/decode routines which are intended to be shared by
  90  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  91  *
  92  * If the pain of reading these is too great, it should be a straightforward
  93  * task to translate them into Linux-specific versions which are more
  94  * consistent with the style used in NFSv2/v3...
  95  */
  96 #define DECODE_HEAD                             \
  97         __be32 *p;                              \
  98         __be32 status
  99 #define DECODE_TAIL                             \
 100         status = 0;                             \
 101 out:                                            \
 102         return status;                          \
 103 xdr_error:                                      \
 104         dprintk("NFSD: xdr error (%s:%d)\n",    \
 105                         __FILE__, __LINE__);    \
 106         status = nfserr_bad_xdr;                \
 107         goto out
 108
 109 #define READ32(x)         (x) = ntohl(*p++)
 110 #define READ64(x)         do {                  \
 111         (x) = (u64)ntohl(*p++) << 32;           \
 112         (x) |= ntohl(*p++);                     \
 113 } while (0)
 114 #define READTIME(x)       do {                  \
 115         p++;                                    \
 116         (x) = ntohl(*p++);                      \
 117         p++;                                    \
 118 } while (0)
 119 #define READMEM(x,nbytes) do {                  \
 120         x = (char *)p;                          \
 121         p += XDR_QUADLEN(nbytes);               \
 122 } while (0)
 123 #define SAVEMEM(x,nbytes) do {                  \
 124         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 125                 savemem(argp, p, nbytes) :      \
 126                 (char *)p)) {                   \
 127                 dprintk("NFSD: xdr error (%s:%d)\n", \
 128                                 __FILE__, __LINE__); \
 129                 goto xdr_error;                 \
 130                 }                               \
 131         p += XDR_QUADLEN(nbytes);               \
 132 } while (0)
 133 #define COPYMEM(x,nbytes) do {                  \
 134         memcpy((x), p, nbytes);                 \
 135         p += XDR_QUADLEN(nbytes);               \
 136 } while (0)
 137
 138 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 139 #define READ_BUF(nbytes)  do {                  \
 140         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 141                 p = argp->p;                    \
 142                 argp->p += XDR_QUADLEN(nbytes); \
 143         } else if (!(p = read_buf(argp, nbytes))) { \
 144                 dprintk("NFSD: xdr error (%s:%d)\n", \
 145                                 __FILE__, __LINE__); \
 146                 goto xdr_error;                 \
 147         }                                       \
 148 } while (0)
 149
 150 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 151 {
 152         /* We want more bytes than seem to be available.
 153          * Maybe we need a new page, maybe we have just run out
 154          */
 155         unsigned int avail = (char *)argp->end - (char *)argp->p;
 156         __be32 *p;
 157         if (avail + argp->pagelen < nbytes)
 158                 return NULL;
 159         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 160                 return NULL;
 161         /* ok, we can do it with the current plus the next page */
 162         if (nbytes <= sizeof(argp->tmp))
 163                 p = argp->tmp;
 164         else {
 165                 kfree(argp->tmpp);
 166                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 167                 if (!p)
 168                         return NULL;
 169
 170         }
 171         /*
 172          * The following memcpy is safe because read_buf is always
 173          * called with nbytes > avail, and the two cases above both
 174          * guarantee p points to at least nbytes bytes.
 175          */
 176         memcpy(p, argp->p, avail);
 177         /* step to next page */
 178         argp->p = page_address(argp->pagelist[0]);
 179         argp->pagelist++;
 180         if (argp->pagelen < PAGE_SIZE) {
 181                 argp->end = p + (argp->pagelen>>2);
 182                 argp->pagelen = 0;
 183         } else {
 184                 argp->end = p + (PAGE_SIZE>>2);
 185                 argp->pagelen -= PAGE_SIZE;
 186         }
 187         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 188         argp->p += XDR_QUADLEN(nbytes - avail);
 189         return p;
 190 }
 191
 192 static int zero_clientid(clientid_t *clid)
 193 {
 194         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 195 }
 196
 197 static int
 198 defer_free(struct nfsd4_compoundargs *argp,
 199                 void (*release)(const void *), void *p)
 200 {
 201         struct tmpbuf *tb;
 202
 203         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 204         if (!tb)
 205                 return -ENOMEM;
 206         tb->buf = p;
 207         tb->release = release;
 208         tb->next = argp->to_free;
 209         argp->to_free = tb;
 210         return 0;
 211 }
 212
 213 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 214 {
 215         if (p == argp->tmp) {
 216                 p = kmalloc(nbytes, GFP_KERNEL);
 217                 if (!p)
 218                         return NULL;
 219                 memcpy(p, argp->tmp, nbytes);
 220         } else {
 221                 BUG_ON(p != argp->tmpp);
 222                 argp->tmpp = NULL;
 223         }
 224         if (defer_free(argp, kfree, p)) {
 225                 kfree(p);
 226                 return NULL;
 227         } else
 228                 return (char *)p;
 229 }
 230
 231 static __be32
 232 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 233 {
 234         u32 bmlen;
 235         DECODE_HEAD;
 236
 237         bmval[0] = 0;
 238         bmval[1] = 0;
 239         bmval[2] = 0;
 240
 241         READ_BUF(4);
 242         READ32(bmlen);
 243         if (bmlen > 1000)
 244                 goto xdr_error;
 245
 246         READ_BUF(bmlen << 2);
 247         if (bmlen > 0)
 248                 READ32(bmval[0]);
 249         if (bmlen > 1)
 250                 READ32(bmval[1]);
 251         if (bmlen > 2)
 252                 READ32(bmval[2]);
 253
 254         DECODE_TAIL;
 255 }
 256
 257 static u32 nfsd_attrmask[] = {
 258         NFSD_WRITEABLE_ATTRS_WORD0,
 259         NFSD_WRITEABLE_ATTRS_WORD1,
 260         NFSD_WRITEABLE_ATTRS_WORD2
 261 };
 262
 263 static u32 nfsd41_ex_attrmask[] = {
 264         NFSD_SUPPATTR_EXCLCREAT_WORD0,
 265         NFSD_SUPPATTR_EXCLCREAT_WORD1,
 266         NFSD_SUPPATTR_EXCLCREAT_WORD2
 267 };
 268
 269 static __be32
 270 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, u32 *writable,
 271                    struct iattr *iattr, struct nfs4_acl **acl)
 272 {
 273         int expected_len, len = 0;
 274         u32 dummy32;
 275         char *buf;
 276         int host_err;
 277
 278         DECODE_HEAD;
 279         iattr->ia_valid = 0;
 280         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 281                 return status;
 282
 283         /*
 284          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
 285          * read-only attributes return ERR_INVAL.
 286          */
 287         if ((bmval[0] & ~nfsd_suppattrs0(argp->minorversion)) ||
 288             (bmval[1] & ~nfsd_suppattrs1(argp->minorversion)) ||
 289             (bmval[2] & ~nfsd_suppattrs2(argp->minorversion)))
 290                 return nfserr_attrnotsupp;
 291         if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
 292             (bmval[2] & ~writable[2]))
 293                 return nfserr_inval;
 294
 295         READ_BUF(4);
 296         READ32(expected_len);
 297
 298         if (bmval[0] & FATTR4_WORD0_SIZE) {
 299                 READ_BUF(8);
 300                 len += 8;
 301                 READ64(iattr->ia_size);
 302                 iattr->ia_valid |= ATTR_SIZE;
 303         }
 304         if (bmval[0] & FATTR4_WORD0_ACL) {
 305                 int nace;
 306                 struct nfs4_ace *ace;
 307
 308                 READ_BUF(4); len += 4;
 309                 READ32(nace);
 310
 311                 if (nace > NFS4_ACL_MAX)
 312                         return nfserr_resource;
 313
 314                 *acl = nfs4_acl_new(nace);
 315                 if (*acl == NULL) {
 316                         host_err = -ENOMEM;
 317                         goto out_nfserr;
 318                 }
 319                 defer_free(argp, kfree, *acl);
 320
 321                 (*acl)->naces = nace;
 322                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 323                         READ_BUF(16); len += 16;
 324                         READ32(ace->type);
 325                         READ32(ace->flag);
 326                         READ32(ace->access_mask);
 327                         READ32(dummy32);
 328                         READ_BUF(dummy32);
 329                         len += XDR_QUADLEN(dummy32) << 2;
 330                         READMEM(buf, dummy32);
 331                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 332                         host_err = 0;
 333                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 334                                 ace->who = 0;
 335                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 336                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 337                                                 buf, dummy32, &ace->who);
 338                         else
 339                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 340                                                 buf, dummy32, &ace->who);
 341                         if (host_err)
 342                                 goto out_nfserr;
 343                 }
 344         } else
 345                 *acl = NULL;
 346         if (bmval[1] & FATTR4_WORD1_MODE) {
 347                 READ_BUF(4);
 348                 len += 4;
 349                 READ32(iattr->ia_mode);
 350                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 351                 iattr->ia_valid |= ATTR_MODE;
 352         }
 353         if (bmval[1] & FATTR4_WORD1_OWNER) {
 354                 READ_BUF(4);
 355                 len += 4;
 356                 READ32(dummy32);
 357                 READ_BUF(dummy32);
 358                 len += (XDR_QUADLEN(dummy32) << 2);
 359                 READMEM(buf, dummy32);
 360                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 361                         goto out_nfserr;
 362                 iattr->ia_valid |= ATTR_UID;
 363         }
 364         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 365                 READ_BUF(4);
 366                 len += 4;
 367                 READ32(dummy32);
 368                 READ_BUF(dummy32);
 369                 len += (XDR_QUADLEN(dummy32) << 2);
 370                 READMEM(buf, dummy32);
 371                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 372                         goto out_nfserr;
 373                 iattr->ia_valid |= ATTR_GID;
 374         }
 375         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 376                 READ_BUF(4);
 377                 len += 4;
 378                 READ32(dummy32);
 379                 switch (dummy32) {
 380                 case NFS4_SET_TO_CLIENT_TIME:
 381                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 382                            all 32 bits of 'nseconds'. */
 383                         READ_BUF(12);
 384                         len += 12;
 385                         READ32(dummy32);
 386                         if (dummy32)
 387                                 return nfserr_inval;
 388                         READ32(iattr->ia_atime.tv_sec);
 389                         READ32(iattr->ia_atime.tv_nsec);
 390                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 391                                 return nfserr_inval;
 392                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 393                         break;
 394                 case NFS4_SET_TO_SERVER_TIME:
 395                         iattr->ia_valid |= ATTR_ATIME;
 396                         break;
 397                 default:
 398                         goto xdr_error;
 399                 }
 400         }
 401         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 402                 READ_BUF(4);
 403                 len += 4;
 404                 READ32(dummy32);
 405                 switch (dummy32) {
 406                 case NFS4_SET_TO_CLIENT_TIME:
 407                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 408                            all 32 bits of 'nseconds'. */
 409                         READ_BUF(12);
 410                         len += 12;
 411                         READ32(dummy32);
 412                         if (dummy32)
 413                                 return nfserr_inval;
 414                         READ32(iattr->ia_mtime.tv_sec);
 415                         READ32(iattr->ia_mtime.tv_nsec);
 416                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 417                                 return nfserr_inval;
 418                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 419                         break;
 420                 case NFS4_SET_TO_SERVER_TIME:
 421                         iattr->ia_valid |= ATTR_MTIME;
 422                         break;
 423                 default:
 424                         goto xdr_error;
 425                 }
 426         }
 427         BUG_ON(bmval[2]);       /* no such writeable attr supported yet */
 428         if (len != expected_len)
 429                 goto xdr_error;
 430
 431         DECODE_TAIL;
 432
 433 out_nfserr:
 434         status = nfserrno(host_err);
 435         goto out;
 436 }
 437
 438 static __be32
 439 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 440 {
 441         DECODE_HEAD;
 442
 443         READ_BUF(sizeof(stateid_t));
 444         READ32(sid->si_generation);
 445         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 446
 447         DECODE_TAIL;
 448 }
 449
 450 static __be32
 451 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 452 {
 453         DECODE_HEAD;
 454
 455         READ_BUF(4);
 456         READ32(access->ac_req_access);
 457
 458         DECODE_TAIL;
 459 }
 460
 461 static __be32
 462 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 463 {
 464         DECODE_HEAD;
 465
 466         close->cl_stateowner = NULL;
 467         READ_BUF(4);
 468         READ32(close->cl_seqid);
 469         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 470
 471         DECODE_TAIL;
 472 }
 473
 474
 475 static __be32
 476 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 477 {
 478         DECODE_HEAD;
 479
 480         READ_BUF(12);
 481         READ64(commit->co_offset);
 482         READ32(commit->co_count);
 483
 484         DECODE_TAIL;
 485 }
 486
 487 static __be32
 488 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 489 {
 490         DECODE_HEAD;
 491
 492         READ_BUF(4);
 493         READ32(create->cr_type);
 494         switch (create->cr_type) {
 495         case NF4LNK:
 496                 READ_BUF(4);
 497                 READ32(create->cr_linklen);
 498                 READ_BUF(create->cr_linklen);
 499                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 500                 break;
 501         case NF4BLK:
 502         case NF4CHR:
 503                 READ_BUF(8);
 504                 READ32(create->cr_specdata1);
 505                 READ32(create->cr_specdata2);
 506                 break;
 507         case NF4SOCK:
 508         case NF4FIFO:
 509         case NF4DIR:
 510         default:
 511                 break;
 512         }
 513
 514         READ_BUF(4);
 515         READ32(create->cr_namelen);
 516         READ_BUF(create->cr_namelen);
 517         SAVEMEM(create->cr_name, create->cr_namelen);
 518         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 519                 return status;
 520
 521         status = nfsd4_decode_fattr(argp, create->cr_bmval, nfsd_attrmask,
 522                                     &create->cr_iattr, &create->cr_acl);
 523         if (status)
 524                 goto out;
 525
 526         DECODE_TAIL;
 527 }
 528
 529 static inline __be32
 530 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 531 {
 532         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 533 }
 534
 535 static inline __be32
 536 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 537 {
 538         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 539 }
 540
 541 static __be32
 542 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 543 {
 544         DECODE_HEAD;
 545
 546         READ_BUF(4);
 547         READ32(link->li_namelen);
 548         READ_BUF(link->li_namelen);
 549         SAVEMEM(link->li_name, link->li_namelen);
 550         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 551                 return status;
 552
 553         DECODE_TAIL;
 554 }
 555
 556 static __be32
 557 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 558 {
 559         DECODE_HEAD;
 560
 561         lock->lk_replay_owner = NULL;
 562         /*
 563         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 564         */
 565         READ_BUF(28);
 566         READ32(lock->lk_type);
 567         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 568                 goto xdr_error;
 569         READ32(lock->lk_reclaim);
 570         READ64(lock->lk_offset);
 571         READ64(lock->lk_length);
 572         READ32(lock->lk_is_new);
 573
 574         if (lock->lk_is_new) {
 575                 READ_BUF(4);
 576                 READ32(lock->lk_new_open_seqid);
 577                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 578                 if (status)
 579                         return status;
 580                 READ_BUF(8 + sizeof(clientid_t));
 581                 READ32(lock->lk_new_lock_seqid);
 582                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 583                 READ32(lock->lk_new_owner.len);
 584                 READ_BUF(lock->lk_new_owner.len);
 585                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 586         } else {
 587                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 588                 if (status)
 589                         return status;
 590                 READ_BUF(4);
 591                 READ32(lock->lk_old_lock_seqid);
 592         }
 593
 594         DECODE_TAIL;
 595 }
 596
 597 static __be32
 598 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 599 {
 600         DECODE_HEAD;
 601
 602         READ_BUF(32);
 603         READ32(lockt->lt_type);
 604         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 605                 goto xdr_error;
 606         READ64(lockt->lt_offset);
 607         READ64(lockt->lt_length);
 608         COPYMEM(&lockt->lt_clientid, 8);
 609         READ32(lockt->lt_owner.len);
 610         READ_BUF(lockt->lt_owner.len);
 611         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 612
 613         if (argp->minorversion && !zero_clientid(&lockt->lt_clientid))
 614                 return nfserr_inval;
 615         DECODE_TAIL;
 616 }
 617
 618 static __be32
 619 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 620 {
 621         DECODE_HEAD;
 622
 623         locku->lu_stateowner = NULL;
 624         READ_BUF(8);
 625         READ32(locku->lu_type);
 626         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 627                 goto xdr_error;
 628         READ32(locku->lu_seqid);
 629         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 630         if (status)
 631                 return status;
 632         READ_BUF(16);
 633         READ64(locku->lu_offset);
 634         READ64(locku->lu_length);
 635
 636         DECODE_TAIL;
 637 }
 638
 639 static __be32
 640 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 641 {
 642         DECODE_HEAD;
 643
 644         READ_BUF(4);
 645         READ32(lookup->lo_len);
 646         READ_BUF(lookup->lo_len);
 647         SAVEMEM(lookup->lo_name, lookup->lo_len);
 648         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 649                 return status;
 650
 651         DECODE_TAIL;
 652 }
 653
 654 static __be32
 655 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 656 {
 657         DECODE_HEAD;
 658
 659         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 660         open->op_iattr.ia_valid = 0;
 661         open->op_stateowner = NULL;
 662
 663         /* seqid, share_access, share_deny, clientid, ownerlen */
 664         READ_BUF(16 + sizeof(clientid_t));
 665         READ32(open->op_seqid);
 666         READ32(open->op_share_access);
 667         READ32(open->op_share_deny);
 668         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 669         READ32(open->op_owner.len);
 670
 671         /* owner, open_flag */
 672         READ_BUF(open->op_owner.len + 4);
 673         SAVEMEM(open->op_owner.data, open->op_owner.len);
 674         READ32(open->op_create);
 675         switch (open->op_create) {
 676         case NFS4_OPEN_NOCREATE:
 677                 break;
 678         case NFS4_OPEN_CREATE:
 679                 READ_BUF(4);
 680                 READ32(open->op_createmode);
 681                 switch (open->op_createmode) {
 682                 case NFS4_CREATE_UNCHECKED:
 683                 case NFS4_CREATE_GUARDED:
 684                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 685                                 nfsd_attrmask, &open->op_iattr, &open->op_acl);
 686                         if (status)
 687                                 goto out;
 688                         break;
 689                 case NFS4_CREATE_EXCLUSIVE:
 690                         READ_BUF(8);
 691                         COPYMEM(open->op_verf.data, 8);
 692                         break;
 693                 case NFS4_CREATE_EXCLUSIVE4_1:
 694                         if (argp->minorversion < 1)
 695                                 goto xdr_error;
 696                         READ_BUF(8);
 697                         COPYMEM(open->op_verf.data, 8);
 698                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 699                                 nfsd41_ex_attrmask, &open->op_iattr,
 700                                 &open->op_acl);
 701                         if (status)
 702                                 goto out;
 703                         break;
 704                 default:
 705                         goto xdr_error;
 706                 }
 707                 break;
 708         default:
 709                 goto xdr_error;
 710         }
 711
 712         /* open_claim */
 713         READ_BUF(4);
 714         READ32(open->op_claim_type);
 715         switch (open->op_claim_type) {
 716         case NFS4_OPEN_CLAIM_NULL:
 717         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 718                 READ_BUF(4);
 719                 READ32(open->op_fname.len);
 720                 READ_BUF(open->op_fname.len);
 721                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 722                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 723                         return status;
 724                 break;
 725         case NFS4_OPEN_CLAIM_PREVIOUS:
 726                 READ_BUF(4);
 727                 READ32(open->op_delegate_type);
 728                 break;
 729         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 730                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 731                 if (status)
 732                         return status;
 733                 READ_BUF(4);
 734                 READ32(open->op_fname.len);
 735                 READ_BUF(open->op_fname.len);
 736                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 737                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 738                         return status;
 739                 break;
 740         default:
 741                 goto xdr_error;
 742         }
 743
 744         DECODE_TAIL;
 745 }
 746
 747 static __be32
 748 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 749 {
 750         DECODE_HEAD;
 751
 752         open_conf->oc_stateowner = NULL;
 753         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 754         if (status)
 755                 return status;
 756         READ_BUF(4);
 757         READ32(open_conf->oc_seqid);
 758
 759         DECODE_TAIL;
 760 }
 761
 762 static __be32
 763 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 764 {
 765         DECODE_HEAD;
 766
 767         open_down->od_stateowner = NULL;
 768         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 769         if (status)
 770                 return status;
 771         READ_BUF(12);
 772         READ32(open_down->od_seqid);
 773         READ32(open_down->od_share_access);
 774         READ32(open_down->od_share_deny);
 775
 776         DECODE_TAIL;
 777 }
 778
 779 static __be32
 780 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 781 {
 782         DECODE_HEAD;
 783
 784         READ_BUF(4);
 785         READ32(putfh->pf_fhlen);
 786         if (putfh->pf_fhlen > NFS4_FHSIZE)
 787                 goto xdr_error;
 788         READ_BUF(putfh->pf_fhlen);
 789         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 790
 791         DECODE_TAIL;
 792 }
 793
 794 static __be32
 795 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 796 {
 797         DECODE_HEAD;
 798
 799         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 800         if (status)
 801                 return status;
 802         READ_BUF(12);
 803         READ64(read->rd_offset);
 804         READ32(read->rd_length);
 805
 806         DECODE_TAIL;
 807 }
 808
 809 static __be32
 810 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 811 {
 812         DECODE_HEAD;
 813
 814         READ_BUF(24);
 815         READ64(readdir->rd_cookie);
 816         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 817         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 818         READ32(readdir->rd_maxcount);
 819         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 820                 goto out;
 821
 822         DECODE_TAIL;
 823 }
 824
 825 static __be32
 826 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 827 {
 828         DECODE_HEAD;
 829
 830         READ_BUF(4);
 831         READ32(remove->rm_namelen);
 832         READ_BUF(remove->rm_namelen);
 833         SAVEMEM(remove->rm_name, remove->rm_namelen);
 834         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 835                 return status;
 836
 837         DECODE_TAIL;
 838 }
 839
 840 static __be32
 841 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 842 {
 843         DECODE_HEAD;
 844
 845         READ_BUF(4);
 846         READ32(rename->rn_snamelen);
 847         READ_BUF(rename->rn_snamelen + 4);
 848         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 849         READ32(rename->rn_tnamelen);
 850         READ_BUF(rename->rn_tnamelen);
 851         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 852         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 853                 return status;
 854         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 855                 return status;
 856
 857         DECODE_TAIL;
 858 }
 859
 860 static __be32
 861 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 862 {
 863         DECODE_HEAD;
 864
 865         READ_BUF(sizeof(clientid_t));
 866         COPYMEM(clientid, sizeof(clientid_t));
 867
 868         DECODE_TAIL;
 869 }
 870
 871 static __be32
 872 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 873                      struct nfsd4_secinfo *secinfo)
 874 {
 875         DECODE_HEAD;
 876
 877         READ_BUF(4);
 878         READ32(secinfo->si_namelen);
 879         READ_BUF(secinfo->si_namelen);
 880         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 881         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 882                                                                 nfserr_noent);
 883         if (status)
 884                 return status;
 885         DECODE_TAIL;
 886 }
 887
 888 static __be32
 889 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 890 {
 891         __be32 status;
 892
 893         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 894         if (status)
 895                 return status;
 896         return nfsd4_decode_fattr(argp, setattr->sa_bmval, nfsd_attrmask,
 897                                   &setattr->sa_iattr, &setattr->sa_acl);
 898 }
 899
 900 static __be32
 901 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 902 {
 903         DECODE_HEAD;
 904
 905         READ_BUF(12);
 906         COPYMEM(setclientid->se_verf.data, 8);
 907         READ32(setclientid->se_namelen);
 908
 909         READ_BUF(setclientid->se_namelen + 8);
 910         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 911         READ32(setclientid->se_callback_prog);
 912         READ32(setclientid->se_callback_netid_len);
 913
 914         READ_BUF(setclientid->se_callback_netid_len + 4);
 915         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 916         READ32(setclientid->se_callback_addr_len);
 917
 918         READ_BUF(setclientid->se_callback_addr_len + 4);
 919         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 920         READ32(setclientid->se_callback_ident);
 921
 922         DECODE_TAIL;
 923 }
 924
 925 static __be32
 926 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 927 {
 928         DECODE_HEAD;
 929
 930         READ_BUF(8 + sizeof(nfs4_verifier));
 931         COPYMEM(&scd_c->sc_clientid, 8);
 932         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 933
 934         DECODE_TAIL;
 935 }
 936
 937 /* Also used for NVERIFY */
 938 static __be32
 939 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 940 {
 941 #if 0
 942         struct nfsd4_compoundargs save = {
 943                 .p = argp->p,
 944                 .end = argp->end,
 945                 .rqstp = argp->rqstp,
 946         };
 947         u32             ve_bmval[2];
 948         struct iattr    ve_iattr;           /* request */
 949         struct nfs4_acl *ve_acl;            /* request */
 950 #endif
 951         DECODE_HEAD;
 952
 953         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 954                 goto out;
 955
 956         /* For convenience's sake, we compare raw xdr'd attributes in
 957          * nfsd4_proc_verify; however we still decode here just to return
 958          * correct error in case of bad xdr. */
 959 #if 0
 960         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 961         if (status == nfserr_inval) {
 962                 status = nfserrno(status);
 963                 goto out;
 964         }
 965 #endif
 966         READ_BUF(4);
 967         READ32(verify->ve_attrlen);
 968         READ_BUF(verify->ve_attrlen);
 969         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 970
 971         DECODE_TAIL;
 972 }
 973
 974 static __be32
 975 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 976 {
 977         int avail;
 978         int v;
 979         int len;
 980         DECODE_HEAD;
 981
 982         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
 983         if (status)
 984                 return status;
 985         READ_BUF(16);
 986         READ64(write->wr_offset);
 987         READ32(write->wr_stable_how);
 988         if (write->wr_stable_how > 2)
 989                 goto xdr_error;
 990         READ32(write->wr_buflen);
 991
 992         /* Sorry .. no magic macros for this.. *
 993          * READ_BUF(write->wr_buflen);
 994          * SAVEMEM(write->wr_buf, write->wr_buflen);
 995          */
 996         avail = (char*)argp->end - (char*)argp->p;
 997         if (avail + argp->pagelen < write->wr_buflen) {
 998                 dprintk("NFSD: xdr error (%s:%d)\n",
 999                                 __FILE__, __LINE__);
1000                 goto xdr_error;
1001         }
1002         argp->rqstp->rq_vec[0].iov_base = p;
1003         argp->rqstp->rq_vec[0].iov_len = avail;
1004         v = 0;
1005         len = write->wr_buflen;
1006         while (len > argp->rqstp->rq_vec[v].iov_len) {
1007                 len -= argp->rqstp->rq_vec[v].iov_len;
1008                 v++;
1009                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
1010                 argp->pagelist++;
1011                 if (argp->pagelen >= PAGE_SIZE) {
1012                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1013                         argp->pagelen -= PAGE_SIZE;
1014                 } else {
1015                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
1016                         argp->pagelen -= len;
1017                 }
1018         }
1019         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1020         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1021         argp->rqstp->rq_vec[v].iov_len = len;
1022         write->wr_vlen = v+1;
1023
1024         DECODE_TAIL;
1025 }
1026
1027 static __be32
1028 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1029 {
1030         DECODE_HEAD;
1031
1032         READ_BUF(12);
1033         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1034         READ32(rlockowner->rl_owner.len);
1035         READ_BUF(rlockowner->rl_owner.len);
1036         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1037
1038         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1039                 return nfserr_inval;
1040         DECODE_TAIL;
1041 }
1042
1043 static __be32
1044 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1045                          struct nfsd4_exchange_id *exid)
1046 {
1047         int dummy;
1048         DECODE_HEAD;
1049
1050         READ_BUF(NFS4_VERIFIER_SIZE);
1051         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1052
1053         READ_BUF(4);
1054         READ32(exid->clname.len);
1055
1056         READ_BUF(exid->clname.len);
1057         SAVEMEM(exid->clname.data, exid->clname.len);
1058
1059         READ_BUF(4);
1060         READ32(exid->flags);
1061
1062         /* Ignore state_protect4_a */
1063         READ_BUF(4);
1064         READ32(exid->spa_how);
1065         switch (exid->spa_how) {
1066         case SP4_NONE:
1067                 break;
1068         case SP4_MACH_CRED:
1069                 /* spo_must_enforce */
1070                 READ_BUF(4);
1071                 READ32(dummy);
1072                 READ_BUF(dummy * 4);
1073                 p += dummy;
1074
1075                 /* spo_must_allow */
1076                 READ_BUF(4);
1077                 READ32(dummy);
1078                 READ_BUF(dummy * 4);
1079                 p += dummy;
1080                 break;
1081         case SP4_SSV:
1082                 /* ssp_ops */
1083                 READ_BUF(4);
1084                 READ32(dummy);
1085                 READ_BUF(dummy * 4);
1086                 p += dummy;
1087
1088                 READ_BUF(4);
1089                 READ32(dummy);
1090                 READ_BUF(dummy * 4);
1091                 p += dummy;
1092
1093                 /* ssp_hash_algs<> */
1094                 READ_BUF(4);
1095                 READ32(dummy);
1096                 READ_BUF(dummy);
1097                 p += XDR_QUADLEN(dummy);
1098
1099                 /* ssp_encr_algs<> */
1100                 READ_BUF(4);
1101                 READ32(dummy);
1102                 READ_BUF(dummy);
1103                 p += XDR_QUADLEN(dummy);
1104
1105                 /* ssp_window and ssp_num_gss_handles */
1106                 READ_BUF(8);
1107                 READ32(dummy);
1108                 READ32(dummy);
1109                 break;
1110         default:
1111                 goto xdr_error;
1112         }
1113
1114         /* Ignore Implementation ID */
1115         READ_BUF(4);    /* nfs_impl_id4 array length */
1116         READ32(dummy);
1117
1118         if (dummy > 1)
1119                 goto xdr_error;
1120
1121         if (dummy == 1) {
1122                 /* nii_domain */
1123                 READ_BUF(4);
1124                 READ32(dummy);
1125                 READ_BUF(dummy);
1126                 p += XDR_QUADLEN(dummy);
1127
1128                 /* nii_name */
1129                 READ_BUF(4);
1130                 READ32(dummy);
1131                 READ_BUF(dummy);
1132                 p += XDR_QUADLEN(dummy);
1133
1134                 /* nii_date */
1135                 READ_BUF(12);
1136                 p += 3;
1137         }
1138         DECODE_TAIL;
1139 }
1140
1141 static __be32
1142 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1143                             struct nfsd4_create_session *sess)
1144 {
1145         DECODE_HEAD;
1146
1147         u32 dummy;
1148         char *machine_name;
1149         int i;
1150         int nr_secflavs;
1151
1152         READ_BUF(16);
1153         COPYMEM(&sess->clientid, 8);
1154         READ32(sess->seqid);
1155         READ32(sess->flags);
1156
1157         /* Fore channel attrs */
1158         READ_BUF(28);
1159         READ32(dummy); /* headerpadsz is always 0 */
1160         READ32(sess->fore_channel.maxreq_sz);
1161         READ32(sess->fore_channel.maxresp_sz);
1162         READ32(sess->fore_channel.maxresp_cached);
1163         READ32(sess->fore_channel.maxops);
1164         READ32(sess->fore_channel.maxreqs);
1165         READ32(sess->fore_channel.nr_rdma_attrs);
1166         if (sess->fore_channel.nr_rdma_attrs == 1) {
1167                 READ_BUF(4);
1168                 READ32(sess->fore_channel.rdma_attrs);
1169         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1170                 dprintk("Too many fore channel attr bitmaps!\n");
1171                 goto xdr_error;
1172         }
1173
1174         /* Back channel attrs */
1175         READ_BUF(28);
1176         READ32(dummy); /* headerpadsz is always 0 */
1177         READ32(sess->back_channel.maxreq_sz);
1178         READ32(sess->back_channel.maxresp_sz);
1179         READ32(sess->back_channel.maxresp_cached);
1180         READ32(sess->back_channel.maxops);
1181         READ32(sess->back_channel.maxreqs);
1182         READ32(sess->back_channel.nr_rdma_attrs);
1183         if (sess->back_channel.nr_rdma_attrs == 1) {
1184                 READ_BUF(4);
1185                 READ32(sess->back_channel.rdma_attrs);
1186         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1187                 dprintk("Too many back channel attr bitmaps!\n");
1188                 goto xdr_error;
1189         }
1190
1191         READ_BUF(8);
1192         READ32(sess->callback_prog);
1193
1194         /* callback_sec_params4 */
1195         READ32(nr_secflavs);
1196         for (i = 0; i < nr_secflavs; ++i) {
1197                 READ_BUF(4);
1198                 READ32(dummy);
1199                 switch (dummy) {
1200                 case RPC_AUTH_NULL:
1201                         /* Nothing to read */
1202                         break;
1203                 case RPC_AUTH_UNIX:
1204                         READ_BUF(8);
1205                         /* stamp */
1206                         READ32(dummy);
1207
1208                         /* machine name */
1209                         READ32(dummy);
1210                         READ_BUF(dummy);
1211                         SAVEMEM(machine_name, dummy);
1212
1213                         /* uid, gid */
1214                         READ_BUF(8);
1215                         READ32(sess->uid);
1216                         READ32(sess->gid);
1217
1218                         /* more gids */
1219                         READ_BUF(4);
1220                         READ32(dummy);
1221                         READ_BUF(dummy * 4);
1222                         for (i = 0; i < dummy; ++i)
1223                                 READ32(dummy);
1224                         break;
1225                 case RPC_AUTH_GSS:
1226                         dprintk("RPC_AUTH_GSS callback secflavor "
1227                                 "not supported!\n");
1228                         READ_BUF(8);
1229                         /* gcbp_service */
1230                         READ32(dummy);
1231                         /* gcbp_handle_from_server */
1232                         READ32(dummy);
1233                         READ_BUF(dummy);
1234                         p += XDR_QUADLEN(dummy);
1235                         /* gcbp_handle_from_client */
1236                         READ_BUF(4);
1237                         READ32(dummy);
1238                         READ_BUF(dummy);
1239                         p += XDR_QUADLEN(dummy);
1240                         break;
1241                 default:
1242                         dprintk("Illegal callback secflavor\n");
1243                         return nfserr_inval;
1244                 }
1245         }
1246         DECODE_TAIL;
1247 }
1248
1249 static __be32
1250 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1251                              struct nfsd4_destroy_session *destroy_session)
1252 {
1253         DECODE_HEAD;
1254         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1255         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1256
1257         DECODE_TAIL;
1258 }
1259
1260 static __be32
1261 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1262                       struct nfsd4_sequence *seq)
1263 {
1264         DECODE_HEAD;
1265
1266         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1267         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1268         READ32(seq->seqid);
1269         READ32(seq->slotid);
1270         READ32(seq->maxslots);
1271         READ32(seq->cachethis);
1272
1273         DECODE_TAIL;
1274 }
1275
1276 static __be32
1277 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1278 {
1279         return nfs_ok;
1280 }
1281
1282 static __be32
1283 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1284 {
1285         return nfserr_notsupp;
1286 }
1287
1288 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1289
1290 static nfsd4_dec nfsd4_dec_ops[] = {
1291         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1292         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1293         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1294         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1295         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1296         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1297         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1298         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1299         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1300         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1301         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1302         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1303         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1304         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1305         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1306         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1307         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1308         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1309         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1310         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1311         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1312         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1313         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1314         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1315         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1316         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1317         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1318         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1319         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1320         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1321         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1322         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1323         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1324         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1325         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1326         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1327         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1328 };
1329
1330 static nfsd4_dec nfsd41_dec_ops[] = {
1331         [OP_ACCESS]             (nfsd4_dec)nfsd4_decode_access,
1332         [OP_CLOSE]              (nfsd4_dec)nfsd4_decode_close,
1333         [OP_COMMIT]             (nfsd4_dec)nfsd4_decode_commit,
1334         [OP_CREATE]             (nfsd4_dec)nfsd4_decode_create,
1335         [OP_DELEGPURGE]         (nfsd4_dec)nfsd4_decode_notsupp,
1336         [OP_DELEGRETURN]        (nfsd4_dec)nfsd4_decode_delegreturn,
1337         [OP_GETATTR]            (nfsd4_dec)nfsd4_decode_getattr,
1338         [OP_GETFH]              (nfsd4_dec)nfsd4_decode_noop,
1339         [OP_LINK]               (nfsd4_dec)nfsd4_decode_link,
1340         [OP_LOCK]               (nfsd4_dec)nfsd4_decode_lock,
1341         [OP_LOCKT]              (nfsd4_dec)nfsd4_decode_lockt,
1342         [OP_LOCKU]              (nfsd4_dec)nfsd4_decode_locku,
1343         [OP_LOOKUP]             (nfsd4_dec)nfsd4_decode_lookup,
1344         [OP_LOOKUPP]            (nfsd4_dec)nfsd4_decode_noop,
1345         [OP_NVERIFY]            (nfsd4_dec)nfsd4_decode_verify,
1346         [OP_OPEN]               (nfsd4_dec)nfsd4_decode_open,
1347         [OP_OPENATTR]           (nfsd4_dec)nfsd4_decode_notsupp,
1348         [OP_OPEN_CONFIRM]       (nfsd4_dec)nfsd4_decode_notsupp,
1349         [OP_OPEN_DOWNGRADE]     (nfsd4_dec)nfsd4_decode_open_downgrade,
1350         [OP_PUTFH]              (nfsd4_dec)nfsd4_decode_putfh,
1351         [OP_PUTPUBFH]           (nfsd4_dec)nfsd4_decode_notsupp,
1352         [OP_PUTROOTFH]          (nfsd4_dec)nfsd4_decode_noop,
1353         [OP_READ]               (nfsd4_dec)nfsd4_decode_read,
1354         [OP_READDIR]            (nfsd4_dec)nfsd4_decode_readdir,
1355         [OP_READLINK]           (nfsd4_dec)nfsd4_decode_noop,
1356         [OP_REMOVE]             (nfsd4_dec)nfsd4_decode_remove,
1357         [OP_RENAME]             (nfsd4_dec)nfsd4_decode_rename,
1358         [OP_RENEW]              (nfsd4_dec)nfsd4_decode_notsupp,
1359         [OP_RESTOREFH]          (nfsd4_dec)nfsd4_decode_noop,
1360         [OP_SAVEFH]             (nfsd4_dec)nfsd4_decode_noop,
1361         [OP_SECINFO]            (nfsd4_dec)nfsd4_decode_secinfo,
1362         [OP_SETATTR]            (nfsd4_dec)nfsd4_decode_setattr,
1363         [OP_SETCLIENTID]        (nfsd4_dec)nfsd4_decode_notsupp,
1364         [OP_SETCLIENTID_CONFIRM](nfsd4_dec)nfsd4_decode_notsupp,
1365         [OP_VERIFY]             (nfsd4_dec)nfsd4_decode_verify,
1366         [OP_WRITE]              (nfsd4_dec)nfsd4_decode_write,
1367         [OP_RELEASE_LOCKOWNER]  (nfsd4_dec)nfsd4_decode_notsupp,
1368
1369         /* new operations for NFSv4.1 */
1370         [OP_BACKCHANNEL_CTL]    (nfsd4_dec)nfsd4_decode_notsupp,
1371         [OP_BIND_CONN_TO_SESSION](nfsd4_dec)nfsd4_decode_notsupp,
1372         [OP_EXCHANGE_ID]        (nfsd4_dec)nfsd4_decode_exchange_id,
1373         [OP_CREATE_SESSION]     (nfsd4_dec)nfsd4_decode_create_session,
1374         [OP_DESTROY_SESSION]    (nfsd4_dec)nfsd4_decode_destroy_session,
1375         [OP_FREE_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1376         [OP_GET_DIR_DELEGATION] (nfsd4_dec)nfsd4_decode_notsupp,
1377         [OP_GETDEVICEINFO]      (nfsd4_dec)nfsd4_decode_notsupp,
1378         [OP_GETDEVICELIST]      (nfsd4_dec)nfsd4_decode_notsupp,
1379         [OP_LAYOUTCOMMIT]       (nfsd4_dec)nfsd4_decode_notsupp,
1380         [OP_LAYOUTGET]          (nfsd4_dec)nfsd4_decode_notsupp,
1381         [OP_LAYOUTRETURN]       (nfsd4_dec)nfsd4_decode_notsupp,
1382         [OP_SECINFO_NO_NAME]    (nfsd4_dec)nfsd4_decode_notsupp,
1383         [OP_SEQUENCE]           (nfsd4_dec)nfsd4_decode_sequence,
1384         [OP_SET_SSV]            (nfsd4_dec)nfsd4_decode_notsupp,
1385         [OP_TEST_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1386         [OP_WANT_DELEGATION]    (nfsd4_dec)nfsd4_decode_notsupp,
1387         [OP_DESTROY_CLIENTID]   (nfsd4_dec)nfsd4_decode_notsupp,
1388         [OP_RECLAIM_COMPLETE]   (nfsd4_dec)nfsd4_decode_notsupp,
1389 };
1390
1391 struct nfsd4_minorversion_ops {
1392         nfsd4_dec *decoders;
1393         int nops;
1394 };
1395
1396 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1397         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1398         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1399 };
1400
1401 static __be32
1402 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1403 {
1404         DECODE_HEAD;
1405         struct nfsd4_op *op;
1406         struct nfsd4_minorversion_ops *ops;
1407         int i;
1408
1409         /*
1410          * XXX: According to spec, we should check the tag
1411          * for UTF-8 compliance.  I'm postponing this for
1412          * now because it seems that some clients do use
1413          * binary tags.
1414          */
1415         READ_BUF(4);
1416         READ32(argp->taglen);
1417         READ_BUF(argp->taglen + 8);
1418         SAVEMEM(argp->tag, argp->taglen);
1419         READ32(argp->minorversion);
1420         READ32(argp->opcnt);
1421
1422         if (argp->taglen > NFSD4_MAX_TAGLEN)
1423                 goto xdr_error;
1424         if (argp->opcnt > 100)
1425                 goto xdr_error;
1426
1427         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1428                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1429                 if (!argp->ops) {
1430                         argp->ops = argp->iops;
1431                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1432                         goto xdr_error;
1433                 }
1434         }
1435
1436         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1437                 argp->opcnt = 0;
1438
1439         ops = &nfsd4_minorversion[argp->minorversion];
1440         for (i = 0; i < argp->opcnt; i++) {
1441                 op = &argp->ops[i];
1442                 op->replay = NULL;
1443
1444                 /*
1445                  * We can't use READ_BUF() here because we need to handle
1446                  * a missing opcode as an OP_WRITE + 1. So we need to check
1447                  * to see if we're truly at the end of our buffer or if there
1448                  * is another page we need to flip to.
1449                  */
1450
1451                 if (argp->p == argp->end) {
1452                         if (argp->pagelen < 4) {
1453                                 /* There isn't an opcode still on the wire */
1454                                 op->opnum = OP_WRITE + 1;
1455                                 op->status = nfserr_bad_xdr;
1456                                 argp->opcnt = i+1;
1457                                 break;
1458                         }
1459
1460                         /*
1461                          * False alarm. We just hit a page boundary, but there
1462                          * is still data available.  Move pointer across page
1463                          * boundary.  *snip from READ_BUF*
1464                          */
1465                         argp->p = page_address(argp->pagelist[0]);
1466                         argp->pagelist++;
1467                         if (argp->pagelen < PAGE_SIZE) {
1468                                 argp->end = p + (argp->pagelen>>2);
1469                                 argp->pagelen = 0;
1470                         } else {
1471                                 argp->end = p + (PAGE_SIZE>>2);
1472                                 argp->pagelen -= PAGE_SIZE;
1473                         }
1474                 }
1475                 op->opnum = ntohl(*argp->p++);
1476
1477                 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1478                         op->status = ops->decoders[op->opnum](argp, &op->u);
1479                 else {
1480                         op->opnum = OP_ILLEGAL;
1481                         op->status = nfserr_op_illegal;
1482                 }
1483
1484                 if (op->status) {
1485                         argp->opcnt = i+1;
1486                         break;
1487                 }
1488         }
1489
1490         DECODE_TAIL;
1491 }
1492 /*
1493  * END OF "GENERIC" DECODE ROUTINES.
1494  */
1495
1496 /*
1497  * START OF "GENERIC" ENCODE ROUTINES.
1498  *   These may look a little ugly since they are imported from a "generic"
1499  * set of XDR encode/decode routines which are intended to be shared by
1500  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1501  *
1502  * If the pain of reading these is too great, it should be a straightforward
1503  * task to translate them into Linux-specific versions which are more
1504  * consistent with the style used in NFSv2/v3...
1505  */
1506 #define WRITE32(n)               *p++ = htonl(n)
1507 #define WRITE64(n)               do {                           \
1508         *p++ = htonl((u32)((n) >> 32));                         \
1509         *p++ = htonl((u32)(n));                                 \
1510 } while (0)
1511 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1512         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1513         memcpy(p, ptr, nbytes);                                 \
1514         p += XDR_QUADLEN(nbytes);                               \
1515 }} while (0)
1516 #define WRITECINFO(c)           do {                            \
1517         *p++ = htonl(c.atomic);                                 \
1518         *p++ = htonl(c.before_ctime_sec);                               \
1519         *p++ = htonl(c.before_ctime_nsec);                              \
1520         *p++ = htonl(c.after_ctime_sec);                                \
1521         *p++ = htonl(c.after_ctime_nsec);                               \
1522 } while (0)
1523
1524 #define RESERVE_SPACE(nbytes)   do {                            \
1525         p = resp->p;                                            \
1526         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1527 } while (0)
1528 #define ADJUST_ARGS()           resp->p = p
1529
1530 /*
1531  * Header routine to setup seqid operation replay cache
1532  */
1533 #define ENCODE_SEQID_OP_HEAD                                    \
1534         __be32 *save;                                           \
1535                                                                 \
1536         save = resp->p;
1537
1538 /*
1539  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1540  * is where sequence id's are incremented, and the replay cache is filled.
1541  * Note that we increment sequence id's here, at the last moment, so we're sure
1542  * we know whether the error to be returned is a sequence id mutating error.
1543  */
1544
1545 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1546         if (seqid_mutating_err(nfserr) && stateowner) {         \
1547                 stateowner->so_seqid++;                         \
1548                 stateowner->so_replay.rp_status = nfserr;       \
1549                 stateowner->so_replay.rp_buflen =               \
1550                           (((char *)(resp)->p - (char *)save)); \
1551                 memcpy(stateowner->so_replay.rp_buf, save,      \
1552                         stateowner->so_replay.rp_buflen);       \
1553         } } while (0);
1554
1555 /* Encode as an array of strings the string given with components
1556  * seperated @sep.
1557  */
1558 static __be32 nfsd4_encode_components(char sep, char *components,
1559                                    __be32 **pp, int *buflen)
1560 {
1561         __be32 *p = *pp;
1562         __be32 *countp = p;
1563         int strlen, count=0;
1564         char *str, *end;
1565
1566         dprintk("nfsd4_encode_components(%s)\n", components);
1567         if ((*buflen -= 4) < 0)
1568                 return nfserr_resource;
1569         WRITE32(0); /* We will fill this in with @count later */
1570         end = str = components;
1571         while (*end) {
1572                 for (; *end && (*end != sep); end++)
1573                         ; /* Point to end of component */
1574                 strlen = end - str;
1575                 if (strlen) {
1576                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1577                                 return nfserr_resource;
1578                         WRITE32(strlen);
1579                         WRITEMEM(str, strlen);
1580                         count++;
1581                 }
1582                 else
1583                         end++;
1584                 str = end;
1585         }
1586         *pp = p;
1587         p = countp;
1588         WRITE32(count);
1589         return 0;
1590 }
1591
1592 /*
1593  * encode a location element of a fs_locations structure
1594  */
1595 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1596                                     __be32 **pp, int *buflen)
1597 {
1598         __be32 status;
1599         __be32 *p = *pp;
1600
1601         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1602         if (status)
1603                 return status;
1604         status = nfsd4_encode_components('/', location->path, &p, buflen);
1605         if (status)
1606                 return status;
1607         *pp = p;
1608         return 0;
1609 }
1610
1611 /*
1612  * Return the path to an export point in the pseudo filesystem namespace
1613  * Returned string is safe to use as long as the caller holds a reference
1614  * to @exp.
1615  */
1616 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1617 {
1618         struct svc_fh tmp_fh;
1619         char *path, *rootpath;
1620
1621         fh_init(&tmp_fh, NFS4_FHSIZE);
1622         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1623         if (*stat)
1624                 return NULL;
1625         rootpath = tmp_fh.fh_export->ex_pathname;
1626
1627         path = exp->ex_pathname;
1628
1629         if (strncmp(path, rootpath, strlen(rootpath))) {
1630                 dprintk("nfsd: fs_locations failed;"
1631                         "%s is not contained in %s\n", path, rootpath);
1632                 *stat = nfserr_notsupp;
1633                 return NULL;
1634         }
1635
1636         return path + strlen(rootpath);
1637 }
1638
1639 /*
1640  *  encode a fs_locations structure
1641  */
1642 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1643                                      struct svc_export *exp,
1644                                      __be32 **pp, int *buflen)
1645 {
1646         __be32 status;
1647         int i;
1648         __be32 *p = *pp;
1649         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1650         char *root = nfsd4_path(rqstp, exp, &status);
1651
1652         if (status)
1653                 return status;
1654         status = nfsd4_encode_components('/', root, &p, buflen);
1655         if (status)
1656                 return status;
1657         if ((*buflen -= 4) < 0)
1658                 return nfserr_resource;
1659         WRITE32(fslocs->locations_count);
1660         for (i=0; i<fslocs->locations_count; i++) {
1661                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1662                                                    &p, buflen);
1663                 if (status)
1664                         return status;
1665         }
1666         *pp = p;
1667         return 0;
1668 }
1669
1670 static u32 nfs4_ftypes[16] = {
1671         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1672         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1673         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1674         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1675 };
1676
1677 static __be32
1678 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1679                         __be32 **p, int *buflen)
1680 {
1681         int status;
1682
1683         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1684                 return nfserr_resource;
1685         if (whotype != NFS4_ACL_WHO_NAMED)
1686                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1687         else if (group)
1688                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1689         else
1690                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1691         if (status < 0)
1692                 return nfserrno(status);
1693         *p = xdr_encode_opaque(*p, NULL, status);
1694         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1695         BUG_ON(*buflen < 0);
1696         return 0;
1697 }
1698
1699 static inline __be32
1700 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1701 {
1702         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1703 }
1704
1705 static inline __be32
1706 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1707 {
1708         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1709 }
1710
1711 static inline __be32
1712 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1713                 __be32 **p, int *buflen)
1714 {
1715         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1716 }
1717
1718 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1719                               FATTR4_WORD0_RDATTR_ERROR)
1720 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1721
1722 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1723 {
1724         /* As per referral draft:  */
1725         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1726             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1727                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1728                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1729                         *rdattr_err = NFSERR_MOVED;
1730                 else
1731                         return nfserr_moved;
1732         }
1733         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1734         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1735         return 0;
1736 }
1737
1738 /*
1739  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1740  * ourselves.
1741  *
1742  * @countp is the buffer size in _words_; upon successful return this becomes
1743  * replaced with the number of words written.
1744  */
1745 __be32
1746 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1747                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1748                 struct svc_rqst *rqstp, int ignore_crossmnt)
1749 {
1750         u32 bmval0 = bmval[0];
1751         u32 bmval1 = bmval[1];
1752         u32 bmval2 = bmval[2];
1753         struct kstat stat;
1754         struct svc_fh tempfh;
1755         struct kstatfs statfs;
1756         int buflen = *countp << 2;
1757         __be32 *attrlenp;
1758         u32 dummy;
1759         u64 dummy64;
1760         u32 rdattr_err = 0;
1761         __be32 *p = buffer;
1762         __be32 status;
1763         int err;
1764         int aclsupport = 0;
1765         struct nfs4_acl *acl = NULL;
1766         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1767         u32 minorversion = resp->cstate.minorversion;
1768
1769         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1770         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1771         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1772         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1773
1774         if (exp->ex_fslocs.migrated) {
1775                 BUG_ON(bmval[2]);
1776                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1777                 if (status)
1778                         goto out;
1779         }
1780
1781         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1782         if (err)
1783                 goto out_nfserr;
1784         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1785                         FATTR4_WORD0_MAXNAME)) ||
1786             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1787                        FATTR4_WORD1_SPACE_TOTAL))) {
1788                 err = vfs_statfs(dentry, &statfs);
1789                 if (err)
1790                         goto out_nfserr;
1791         }
1792         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1793                 fh_init(&tempfh, NFS4_FHSIZE);
1794                 status = fh_compose(&tempfh, exp, dentry, NULL);
1795                 if (status)
1796                         goto out;
1797                 fhp = &tempfh;
1798         }
1799         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1800                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1801                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1802                 aclsupport = (err == 0);
1803                 if (bmval0 & FATTR4_WORD0_ACL) {
1804                         if (err == -EOPNOTSUPP)
1805                                 bmval0 &= ~FATTR4_WORD0_ACL;
1806                         else if (err == -EINVAL) {
1807                                 status = nfserr_attrnotsupp;
1808                                 goto out;
1809                         } else if (err != 0)
1810                                 goto out_nfserr;
1811                 }
1812         }
1813         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1814                 if (exp->ex_fslocs.locations == NULL) {
1815                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1816                 }
1817         }
1818         if ((buflen -= 16) < 0)
1819                 goto out_resource;
1820
1821         if (unlikely(bmval2)) {
1822                 WRITE32(3);
1823                 WRITE32(bmval0);
1824                 WRITE32(bmval1);
1825                 WRITE32(bmval2);
1826         } else if (likely(bmval1)) {
1827                 WRITE32(2);
1828                 WRITE32(bmval0);
1829                 WRITE32(bmval1);
1830         } else {
1831                 WRITE32(1);
1832                 WRITE32(bmval0);
1833         }
1834         attrlenp = p++;                /* to be backfilled later */
1835
1836         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1837                 u32 word0 = nfsd_suppattrs0(minorversion);
1838                 u32 word1 = nfsd_suppattrs1(minorversion);
1839                 u32 word2 = nfsd_suppattrs2(minorversion);
1840
1841                 if ((buflen -= 12) < 0)
1842                         goto out_resource;
1843                 if (!aclsupport)
1844                         word0 &= ~FATTR4_WORD0_ACL;
1845                 if (!exp->ex_fslocs.locations)
1846                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1847                 if (!word2) {
1848                         WRITE32(2);
1849                         WRITE32(word0);
1850                         WRITE32(word1);
1851                 } else {
1852                         WRITE32(3);
1853                         WRITE32(word0);
1854                         WRITE32(word1);
1855                         WRITE32(word2);
1856                 }
1857         }
1858         if (bmval0 & FATTR4_WORD0_TYPE) {
1859                 if ((buflen -= 4) < 0)
1860                         goto out_resource;
1861                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1862                 if (dummy == NF4BAD)
1863                         goto out_serverfault;
1864                 WRITE32(dummy);
1865         }
1866         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1867                 if ((buflen -= 4) < 0)
1868                         goto out_resource;
1869                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1870                         WRITE32(NFS4_FH_PERSISTENT);
1871                 else
1872                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1873         }
1874         if (bmval0 & FATTR4_WORD0_CHANGE) {
1875                 /*
1876                  * Note: This _must_ be consistent with the scheme for writing
1877                  * change_info, so any changes made here must be reflected there
1878                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1879                  * macro above.)
1880                  */
1881                 if ((buflen -= 8) < 0)
1882                         goto out_resource;
1883                 WRITE32(stat.ctime.tv_sec);
1884                 WRITE32(stat.ctime.tv_nsec);
1885         }
1886         if (bmval0 & FATTR4_WORD0_SIZE) {
1887                 if ((buflen -= 8) < 0)
1888                         goto out_resource;
1889                 WRITE64(stat.size);
1890         }
1891         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1892                 if ((buflen -= 4) < 0)
1893                         goto out_resource;
1894                 WRITE32(1);
1895         }
1896         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1897                 if ((buflen -= 4) < 0)
1898                         goto out_resource;
1899                 WRITE32(1);
1900         }
1901         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1902                 if ((buflen -= 4) < 0)
1903                         goto out_resource;
1904                 WRITE32(0);
1905         }
1906         if (bmval0 & FATTR4_WORD0_FSID) {
1907                 if ((buflen -= 16) < 0)
1908                         goto out_resource;
1909                 if (exp->ex_fslocs.migrated) {
1910                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1911                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1912                 } else switch(fsid_source(fhp)) {
1913                 case FSIDSOURCE_FSID:
1914                         WRITE64((u64)exp->ex_fsid);
1915                         WRITE64((u64)0);
1916                         break;
1917                 case FSIDSOURCE_DEV:
1918                         WRITE32(0);
1919                         WRITE32(MAJOR(stat.dev));
1920                         WRITE32(0);
1921                         WRITE32(MINOR(stat.dev));
1922                         break;
1923                 case FSIDSOURCE_UUID:
1924                         WRITEMEM(exp->ex_uuid, 16);
1925                         break;
1926                 }
1927         }
1928         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1929                 if ((buflen -= 4) < 0)
1930                         goto out_resource;
1931                 WRITE32(0);
1932         }
1933         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1934                 if ((buflen -= 4) < 0)
1935                         goto out_resource;
1936                 WRITE32(NFSD_LEASE_TIME);
1937         }
1938         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1939                 if ((buflen -= 4) < 0)
1940                         goto out_resource;
1941                 WRITE32(rdattr_err);
1942         }
1943         if (bmval0 & FATTR4_WORD0_ACL) {
1944                 struct nfs4_ace *ace;
1945
1946                 if (acl == NULL) {
1947                         if ((buflen -= 4) < 0)
1948                                 goto out_resource;
1949
1950                         WRITE32(0);
1951                         goto out_acl;
1952                 }
1953                 if ((buflen -= 4) < 0)
1954                         goto out_resource;
1955                 WRITE32(acl->naces);
1956
1957                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1958                         if ((buflen -= 4*3) < 0)
1959                                 goto out_resource;
1960                         WRITE32(ace->type);
1961                         WRITE32(ace->flag);
1962                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1963                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1964                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1965                                 &p, &buflen);
1966                         if (status == nfserr_resource)
1967                                 goto out_resource;
1968                         if (status)
1969                                 goto out;
1970                 }
1971         }
1972 out_acl:
1973         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1974                 if ((buflen -= 4) < 0)
1975                         goto out_resource;
1976                 WRITE32(aclsupport ?
1977                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1978         }
1979         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1980                 if ((buflen -= 4) < 0)
1981                         goto out_resource;
1982                 WRITE32(1);
1983         }
1984         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1985                 if ((buflen -= 4) < 0)
1986                         goto out_resource;
1987                 WRITE32(1);
1988         }
1989         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1990                 if ((buflen -= 4) < 0)
1991                         goto out_resource;
1992                 WRITE32(1);
1993         }
1994         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1995                 if ((buflen -= 4) < 0)
1996                         goto out_resource;
1997                 WRITE32(1);
1998         }
1999         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2000                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2001                 if (buflen < 0)
2002                         goto out_resource;
2003                 WRITE32(fhp->fh_handle.fh_size);
2004                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2005         }
2006         if (bmval0 & FATTR4_WORD0_FILEID) {
2007                 if ((buflen -= 8) < 0)
2008                         goto out_resource;
2009                 WRITE64(stat.ino);
2010         }
2011         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2012                 if ((buflen -= 8) < 0)
2013                         goto out_resource;
2014                 WRITE64((u64) statfs.f_ffree);
2015         }
2016         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2017                 if ((buflen -= 8) < 0)
2018                         goto out_resource;
2019                 WRITE64((u64) statfs.f_ffree);
2020         }
2021         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2022                 if ((buflen -= 8) < 0)
2023                         goto out_resource;
2024                 WRITE64((u64) statfs.f_files);
2025         }
2026         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2027                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2028                 if (status == nfserr_resource)
2029                         goto out_resource;
2030                 if (status)
2031                         goto out;
2032         }
2033         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2034                 if ((buflen -= 4) < 0)
2035                         goto out_resource;
2036                 WRITE32(1);
2037         }
2038         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2039                 if ((buflen -= 8) < 0)
2040                         goto out_resource;
2041                 WRITE64(~(u64)0);
2042         }
2043         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2044                 if ((buflen -= 4) < 0)
2045                         goto out_resource;
2046                 WRITE32(255);
2047         }
2048         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2049                 if ((buflen -= 4) < 0)
2050                         goto out_resource;
2051                 WRITE32(statfs.f_namelen);
2052         }
2053         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2054                 if ((buflen -= 8) < 0)
2055                         goto out_resource;
2056                 WRITE64((u64) svc_max_payload(rqstp));
2057         }
2058         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2059                 if ((buflen -= 8) < 0)
2060                         goto out_resource;
2061                 WRITE64((u64) svc_max_payload(rqstp));
2062         }
2063         if (bmval1 & FATTR4_WORD1_MODE) {
2064                 if ((buflen -= 4) < 0)
2065                         goto out_resource;
2066                 WRITE32(stat.mode & S_IALLUGO);
2067         }
2068         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2069                 if ((buflen -= 4) < 0)
2070                         goto out_resource;
2071                 WRITE32(1);
2072         }
2073         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2074                 if ((buflen -= 4) < 0)
2075                         goto out_resource;
2076                 WRITE32(stat.nlink);
2077         }
2078         if (bmval1 & FATTR4_WORD1_OWNER) {
2079                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2080                 if (status == nfserr_resource)
2081                         goto out_resource;
2082                 if (status)
2083                         goto out;
2084         }
2085         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2086                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2087                 if (status == nfserr_resource)
2088                         goto out_resource;
2089                 if (status)
2090                         goto out;
2091         }
2092         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2093                 if ((buflen -= 8) < 0)
2094                         goto out_resource;
2095                 WRITE32((u32) MAJOR(stat.rdev));
2096                 WRITE32((u32) MINOR(stat.rdev));
2097         }
2098         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2099                 if ((buflen -= 8) < 0)
2100                         goto out_resource;
2101                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2102                 WRITE64(dummy64);
2103         }
2104         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2105                 if ((buflen -= 8) < 0)
2106                         goto out_resource;
2107                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2108                 WRITE64(dummy64);
2109         }
2110         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2111                 if ((buflen -= 8) < 0)
2112                         goto out_resource;
2113                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2114                 WRITE64(dummy64);
2115         }
2116         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2117                 if ((buflen -= 8) < 0)
2118                         goto out_resource;
2119                 dummy64 = (u64)stat.blocks << 9;
2120                 WRITE64(dummy64);
2121         }
2122         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2123                 if ((buflen -= 12) < 0)
2124                         goto out_resource;
2125                 WRITE32(0);
2126                 WRITE32(stat.atime.tv_sec);
2127                 WRITE32(stat.atime.tv_nsec);
2128         }
2129         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2130                 if ((buflen -= 12) < 0)
2131                         goto out_resource;
2132                 WRITE32(0);
2133                 WRITE32(1);
2134                 WRITE32(0);
2135         }
2136         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2137                 if ((buflen -= 12) < 0)
2138                         goto out_resource;
2139                 WRITE32(0);
2140                 WRITE32(stat.ctime.tv_sec);
2141                 WRITE32(stat.ctime.tv_nsec);
2142         }
2143         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2144                 if ((buflen -= 12) < 0)
2145                         goto out_resource;
2146                 WRITE32(0);
2147                 WRITE32(stat.mtime.tv_sec);
2148                 WRITE32(stat.mtime.tv_nsec);
2149         }
2150         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2151                 if ((buflen -= 8) < 0)
2152                         goto out_resource;
2153                 /*
2154                  * Get parent's attributes if not ignoring crossmount
2155                  * and this is the root of a cross-mounted filesystem.
2156                  */
2157                 if (ignore_crossmnt == 0 &&
2158                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
2159                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
2160                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
2161                         if (err)
2162                                 goto out_nfserr;
2163                 }
2164                 WRITE64(stat.ino);
2165         }
2166         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2167                 WRITE32(3);
2168                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2169                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2170                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2171         }
2172
2173         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2174         *countp = p - buffer;
2175         status = nfs_ok;
2176
2177 out:
2178         kfree(acl);
2179         if (fhp == &tempfh)
2180                 fh_put(&tempfh);
2181         return status;
2182 out_nfserr:
2183         status = nfserrno(err);
2184         goto out;
2185 out_resource:
2186         *countp = 0;
2187         status = nfserr_resource;
2188         goto out;
2189 out_serverfault:
2190         status = nfserr_serverfault;
2191         goto out;
2192 }
2193
2194 static inline int attributes_need_mount(u32 *bmval)
2195 {
2196         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2197                 return 1;
2198         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2199                 return 1;
2200         return 0;
2201 }
2202
2203 static __be32
2204 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2205                 const char *name, int namlen, __be32 *p, int *buflen)
2206 {
2207         struct svc_export *exp = cd->rd_fhp->fh_export;
2208         struct dentry *dentry;
2209         __be32 nfserr;
2210         int ignore_crossmnt = 0;
2211
2212         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2213         if (IS_ERR(dentry))
2214                 return nfserrno(PTR_ERR(dentry));
2215
2216         exp_get(exp);
2217         /*
2218          * In the case of a mountpoint, the client may be asking for
2219          * attributes that are only properties of the underlying filesystem
2220          * as opposed to the cross-mounted file system. In such a case,
2221          * we will not follow the cross mount and will fill the attribtutes
2222          * directly from the mountpoint dentry.
2223          */
2224         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
2225                 ignore_crossmnt = 1;
2226         else if (d_mountpoint(dentry)) {
2227                 int err;
2228
2229                 /*
2230                  * Why the heck aren't we just using nfsd_lookup??
2231                  * Different "."/".." handling?  Something else?
2232                  * At least, add a comment here to explain....
2233                  */
2234                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2235                 if (err) {
2236                         nfserr = nfserrno(err);
2237                         goto out_put;
2238                 }
2239                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2240                 if (nfserr)
2241                         goto out_put;
2242
2243         }
2244         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2245                                         cd->rd_rqstp, ignore_crossmnt);
2246 out_put:
2247         dput(dentry);
2248         exp_put(exp);
2249         return nfserr;
2250 }
2251
2252 static __be32 *
2253 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2254 {
2255         __be32 *attrlenp;
2256
2257         if (buflen < 6)
2258                 return NULL;
2259         *p++ = htonl(2);
2260         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2261         *p++ = htonl(0);                         /* bmval1 */
2262
2263         attrlenp = p++;
2264         *p++ = nfserr;       /* no htonl */
2265         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2266         return p;
2267 }
2268
2269 static int
2270 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2271                     loff_t offset, u64 ino, unsigned int d_type)
2272 {
2273         struct readdir_cd *ccd = ccdv;
2274         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2275         int buflen;
2276         __be32 *p = cd->buffer;
2277         __be32 nfserr = nfserr_toosmall;
2278
2279         /* In nfsv4, "." and ".." never make it onto the wire.. */
2280         if (name && isdotent(name, namlen)) {
2281                 cd->common.err = nfs_ok;
2282                 return 0;
2283         }
2284
2285         if (cd->offset)
2286                 xdr_encode_hyper(cd->offset, (u64) offset);
2287
2288         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2289         if (buflen < 0)
2290                 goto fail;
2291
2292         *p++ = xdr_one;                             /* mark entry present */
2293         cd->offset = p;                             /* remember pointer */
2294         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2295         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2296
2297         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2298         switch (nfserr) {
2299         case nfs_ok:
2300                 p += buflen;
2301                 break;
2302         case nfserr_resource:
2303                 nfserr = nfserr_toosmall;
2304                 goto fail;
2305         case nfserr_dropit:
2306                 goto fail;
2307         default:
2308                 /*
2309                  * If the client requested the RDATTR_ERROR attribute,
2310                  * we stuff the error code into this attribute
2311                  * and continue.  If this attribute was not requested,
2312                  * then in accordance with the spec, we fail the
2313                  * entire READDIR operation(!)
2314                  */
2315                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2316                         goto fail;
2317                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2318                 if (p == NULL) {
2319                         nfserr = nfserr_toosmall;
2320                         goto fail;
2321                 }
2322         }
2323         cd->buflen -= (p - cd->buffer);
2324         cd->buffer = p;
2325         cd->common.err = nfs_ok;
2326         return 0;
2327 fail:
2328         cd->common.err = nfserr;
2329         return -EINVAL;
2330 }
2331
2332 static void
2333 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2334 {
2335         __be32 *p;
2336
2337         RESERVE_SPACE(sizeof(stateid_t));
2338         WRITE32(sid->si_generation);
2339         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2340         ADJUST_ARGS();
2341 }
2342
2343 static __be32
2344 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2345 {
2346         __be32 *p;
2347
2348         if (!nfserr) {
2349                 RESERVE_SPACE(8);
2350                 WRITE32(access->ac_supported);
2351                 WRITE32(access->ac_resp_access);
2352                 ADJUST_ARGS();
2353         }
2354         return nfserr;
2355 }
2356
2357 static __be32
2358 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2359 {
2360         ENCODE_SEQID_OP_HEAD;
2361
2362         if (!nfserr)
2363                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2364
2365         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2366         return nfserr;
2367 }
2368
2369
2370 static __be32
2371 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2372 {
2373         __be32 *p;
2374
2375         if (!nfserr) {
2376                 RESERVE_SPACE(8);
2377                 WRITEMEM(commit->co_verf.data, 8);
2378                 ADJUST_ARGS();
2379         }
2380         return nfserr;
2381 }
2382
2383 static __be32
2384 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2385 {
2386         __be32 *p;
2387
2388         if (!nfserr) {
2389                 RESERVE_SPACE(32);
2390                 WRITECINFO(create->cr_cinfo);
2391                 WRITE32(2);
2392                 WRITE32(create->cr_bmval[0]);
2393                 WRITE32(create->cr_bmval[1]);
2394                 ADJUST_ARGS();
2395         }
2396         return nfserr;
2397 }
2398
2399 static __be32
2400 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2401 {
2402         struct svc_fh *fhp = getattr->ga_fhp;
2403         int buflen;
2404
2405         if (nfserr)
2406                 return nfserr;
2407
2408         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2409         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2410                                     resp->p, &buflen, getattr->ga_bmval,
2411                                     resp->rqstp, 0);
2412         if (!nfserr)
2413                 resp->p += buflen;
2414         return nfserr;
2415 }
2416
2417 static __be32
2418 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2419 {
2420         struct svc_fh *fhp = *fhpp;
2421         unsigned int len;
2422         __be32 *p;
2423
2424         if (!nfserr) {
2425                 len = fhp->fh_handle.fh_size;
2426                 RESERVE_SPACE(len + 4);
2427                 WRITE32(len);
2428                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2429                 ADJUST_ARGS();
2430         }
2431         return nfserr;
2432 }
2433
2434 /*
2435 * Including all fields other than the name, a LOCK4denied structure requires
2436 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2437 */
2438 static void
2439 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2440 {
2441         __be32 *p;
2442
2443         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2444         WRITE64(ld->ld_start);
2445         WRITE64(ld->ld_length);
2446         WRITE32(ld->ld_type);
2447         if (ld->ld_sop) {
2448                 WRITEMEM(&ld->ld_clientid, 8);
2449                 WRITE32(ld->ld_sop->so_owner.len);
2450                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2451                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2452         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2453                 WRITE64((u64)0); /* clientid */
2454                 WRITE32(0); /* length of owner name */
2455         }
2456         ADJUST_ARGS();
2457 }
2458
2459 static __be32
2460 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2461 {
2462         ENCODE_SEQID_OP_HEAD;
2463
2464         if (!nfserr)
2465                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2466         else if (nfserr == nfserr_denied)
2467                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2468
2469         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2470         return nfserr;
2471 }
2472
2473 static __be32
2474 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2475 {
2476         if (nfserr == nfserr_denied)
2477                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2478         return nfserr;
2479 }
2480
2481 static __be32
2482 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2483 {
2484         ENCODE_SEQID_OP_HEAD;
2485
2486         if (!nfserr)
2487                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2488
2489         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2490         return nfserr;
2491 }
2492
2493
2494 static __be32
2495 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2496 {
2497         __be32 *p;
2498
2499         if (!nfserr) {
2500                 RESERVE_SPACE(20);
2501                 WRITECINFO(link->li_cinfo);
2502                 ADJUST_ARGS();
2503         }
2504         return nfserr;
2505 }
2506
2507
2508 static __be32
2509 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2510 {
2511         __be32 *p;
2512         ENCODE_SEQID_OP_HEAD;
2513
2514         if (nfserr)
2515                 goto out;
2516
2517         nfsd4_encode_stateid(resp, &open->op_stateid);
2518         RESERVE_SPACE(40);
2519         WRITECINFO(open->op_cinfo);
2520         WRITE32(open->op_rflags);
2521         WRITE32(2);
2522         WRITE32(open->op_bmval[0]);
2523         WRITE32(open->op_bmval[1]);
2524         WRITE32(open->op_delegate_type);
2525         ADJUST_ARGS();
2526
2527         switch (open->op_delegate_type) {
2528         case NFS4_OPEN_DELEGATE_NONE:
2529                 break;
2530         case NFS4_OPEN_DELEGATE_READ:
2531                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2532                 RESERVE_SPACE(20);
2533                 WRITE32(open->op_recall);
2534
2535                 /*
2536                  * TODO: ACE's in delegations
2537                  */
2538                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2539                 WRITE32(0);
2540                 WRITE32(0);
2541                 WRITE32(0);   /* XXX: is NULL principal ok? */
2542                 ADJUST_ARGS();
2543                 break;
2544         case NFS4_OPEN_DELEGATE_WRITE:
2545                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2546                 RESERVE_SPACE(32);
2547                 WRITE32(0);
2548
2549                 /*
2550                  * TODO: space_limit's in delegations
2551                  */
2552                 WRITE32(NFS4_LIMIT_SIZE);
2553                 WRITE32(~(u32)0);
2554                 WRITE32(~(u32)0);
2555
2556                 /*
2557                  * TODO: ACE's in delegations
2558                  */
2559                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2560                 WRITE32(0);
2561                 WRITE32(0);
2562                 WRITE32(0);   /* XXX: is NULL principal ok? */
2563                 ADJUST_ARGS();
2564                 break;
2565         default:
2566                 BUG();
2567         }
2568         /* XXX save filehandle here */
2569 out:
2570         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2571         return nfserr;
2572 }
2573
2574 static __be32
2575 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2576 {
2577         ENCODE_SEQID_OP_HEAD;
2578
2579         if (!nfserr)
2580                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2581
2582         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2583         return nfserr;
2584 }
2585
2586 static __be32
2587 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2588 {
2589         ENCODE_SEQID_OP_HEAD;
2590
2591         if (!nfserr)
2592                 nfsd4_encode_stateid(resp, &od->od_stateid);
2593
2594         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2595         return nfserr;
2596 }
2597
2598 static __be32
2599 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2600                   struct nfsd4_read *read)
2601 {
2602         u32 eof;
2603         int v, pn;
2604         unsigned long maxcount;
2605         long len;
2606         __be32 *p;
2607
2608         if (nfserr)
2609                 return nfserr;
2610         if (resp->xbuf->page_len)
2611                 return nfserr_resource;
2612
2613         RESERVE_SPACE(8); /* eof flag and byte count */
2614
2615         maxcount = svc_max_payload(resp->rqstp);
2616         if (maxcount > read->rd_length)
2617                 maxcount = read->rd_length;
2618
2619         len = maxcount;
2620         v = 0;
2621         while (len > 0) {
2622                 pn = resp->rqstp->rq_resused++;
2623                 resp->rqstp->rq_vec[v].iov_base =
2624                         page_address(resp->rqstp->rq_respages[pn]);
2625                 resp->rqstp->rq_vec[v].iov_len =
2626                         len < PAGE_SIZE ? len : PAGE_SIZE;
2627                 v++;
2628                 len -= PAGE_SIZE;
2629         }
2630         read->rd_vlen = v;
2631
2632         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2633                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2634                         &maxcount);
2635
2636         if (nfserr == nfserr_symlink)
2637                 nfserr = nfserr_inval;
2638         if (nfserr)
2639                 return nfserr;
2640         eof = (read->rd_offset + maxcount >=
2641                read->rd_fhp->fh_dentry->d_inode->i_size);
2642
2643         WRITE32(eof);
2644         WRITE32(maxcount);
2645         ADJUST_ARGS();
2646         resp->xbuf->head[0].iov_len = (char*)p
2647                                         - (char*)resp->xbuf->head[0].iov_base;
2648         resp->xbuf->page_len = maxcount;
2649
2650         /* Use rest of head for padding and remaining ops: */
2651         resp->xbuf->tail[0].iov_base = p;
2652         resp->xbuf->tail[0].iov_len = 0;
2653         if (maxcount&3) {
2654                 RESERVE_SPACE(4);
2655                 WRITE32(0);
2656                 resp->xbuf->tail[0].iov_base += maxcount&3;
2657                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2658                 ADJUST_ARGS();
2659         }
2660         return 0;
2661 }
2662
2663 static __be32
2664 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2665 {
2666         int maxcount;
2667         char *page;
2668         __be32 *p;
2669
2670         if (nfserr)
2671                 return nfserr;
2672         if (resp->xbuf->page_len)
2673                 return nfserr_resource;
2674
2675         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2676
2677         maxcount = PAGE_SIZE;
2678         RESERVE_SPACE(4);
2679
2680         /*
2681          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2682          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2683          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2684          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2685          */
2686         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2687         if (nfserr == nfserr_isdir)
2688                 return nfserr_inval;
2689         if (nfserr)
2690                 return nfserr;
2691
2692         WRITE32(maxcount);
2693         ADJUST_ARGS();
2694         resp->xbuf->head[0].iov_len = (char*)p
2695                                 - (char*)resp->xbuf->head[0].iov_base;
2696         resp->xbuf->page_len = maxcount;
2697
2698         /* Use rest of head for padding and remaining ops: */
2699         resp->xbuf->tail[0].iov_base = p;
2700         resp->xbuf->tail[0].iov_len = 0;
2701         if (maxcount&3) {
2702                 RESERVE_SPACE(4);
2703                 WRITE32(0);
2704                 resp->xbuf->tail[0].iov_base += maxcount&3;
2705                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2706                 ADJUST_ARGS();
2707         }
2708         return 0;
2709 }
2710
2711 static __be32
2712 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2713 {
2714         int maxcount;
2715         loff_t offset;
2716         __be32 *page, *savep, *tailbase;
2717         __be32 *p;
2718
2719         if (nfserr)
2720                 return nfserr;
2721         if (resp->xbuf->page_len)
2722                 return nfserr_resource;
2723
2724         RESERVE_SPACE(8);  /* verifier */
2725         savep = p;
2726
2727         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2728         WRITE32(0);
2729         WRITE32(0);
2730         ADJUST_ARGS();
2731         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2732         tailbase = p;
2733
2734         maxcount = PAGE_SIZE;
2735         if (maxcount > readdir->rd_maxcount)
2736                 maxcount = readdir->rd_maxcount;
2737
2738         /*
2739          * Convert from bytes to words, account for the two words already
2740          * written, make sure to leave two words at the end for the next
2741          * pointer and eof field.
2742          */
2743         maxcount = (maxcount >> 2) - 4;
2744         if (maxcount < 0) {
2745                 nfserr =  nfserr_toosmall;
2746                 goto err_no_verf;
2747         }
2748
2749         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2750         readdir->common.err = 0;
2751         readdir->buflen = maxcount;
2752         readdir->buffer = page;
2753         readdir->offset = NULL;
2754
2755         offset = readdir->rd_cookie;
2756         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2757                               &offset,
2758                               &readdir->common, nfsd4_encode_dirent);
2759         if (nfserr == nfs_ok &&
2760             readdir->common.err == nfserr_toosmall &&
2761             readdir->buffer == page)
2762                 nfserr = nfserr_toosmall;
2763         if (nfserr == nfserr_symlink)
2764                 nfserr = nfserr_notdir;
2765         if (nfserr)
2766                 goto err_no_verf;
2767
2768         if (readdir->offset)
2769                 xdr_encode_hyper(readdir->offset, offset);
2770
2771         p = readdir->buffer;
2772         *p++ = 0;       /* no more entries */
2773         *p++ = htonl(readdir->common.err == nfserr_eof);
2774         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2775                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2776
2777         /* Use rest of head for padding and remaining ops: */
2778         resp->xbuf->tail[0].iov_base = tailbase;
2779         resp->xbuf->tail[0].iov_len = 0;
2780         resp->p = resp->xbuf->tail[0].iov_base;
2781         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2782
2783         return 0;
2784 err_no_verf:
2785         p = savep;
2786         ADJUST_ARGS();
2787         return nfserr;
2788 }
2789
2790 static __be32
2791 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2792 {
2793         __be32 *p;
2794
2795         if (!nfserr) {
2796                 RESERVE_SPACE(20);
2797                 WRITECINFO(remove->rm_cinfo);
2798                 ADJUST_ARGS();
2799         }
2800         return nfserr;
2801 }
2802
2803 static __be32
2804 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2805 {
2806         __be32 *p;
2807
2808         if (!nfserr) {
2809                 RESERVE_SPACE(40);
2810                 WRITECINFO(rename->rn_sinfo);
2811                 WRITECINFO(rename->rn_tinfo);
2812                 ADJUST_ARGS();
2813         }
2814         return nfserr;
2815 }
2816
2817 static __be32
2818 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2819                      struct nfsd4_secinfo *secinfo)
2820 {
2821         int i = 0;
2822         struct svc_export *exp = secinfo->si_exp;
2823         u32 nflavs;
2824         struct exp_flavor_info *flavs;
2825         struct exp_flavor_info def_flavs[2];
2826         __be32 *p;
2827
2828         if (nfserr)
2829                 goto out;
2830         if (exp->ex_nflavors) {
2831                 flavs = exp->ex_flavors;
2832                 nflavs = exp->ex_nflavors;
2833         } else { /* Handling of some defaults in absence of real secinfo: */
2834                 flavs = def_flavs;
2835                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2836                         nflavs = 2;
2837                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2838                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2839                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2840                         nflavs = 1;
2841                         flavs[0].pseudoflavor
2842                                         = svcauth_gss_flavor(exp->ex_client);
2843                 } else {
2844                         nflavs = 1;
2845                         flavs[0].pseudoflavor
2846                                         = exp->ex_client->flavour->flavour;
2847                 }
2848         }
2849
2850         RESERVE_SPACE(4);
2851         WRITE32(nflavs);
2852         ADJUST_ARGS();
2853         for (i = 0; i < nflavs; i++) {
2854                 u32 flav = flavs[i].pseudoflavor;
2855                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2856
2857                 if (gm) {
2858                         RESERVE_SPACE(4);
2859                         WRITE32(RPC_AUTH_GSS);
2860                         ADJUST_ARGS();
2861                         RESERVE_SPACE(4 + gm->gm_oid.len);
2862                         WRITE32(gm->gm_oid.len);
2863                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2864                         ADJUST_ARGS();
2865                         RESERVE_SPACE(4);
2866                         WRITE32(0); /* qop */
2867                         ADJUST_ARGS();
2868                         RESERVE_SPACE(4);
2869                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2870                         ADJUST_ARGS();
2871                         gss_mech_put(gm);
2872                 } else {
2873                         RESERVE_SPACE(4);
2874                         WRITE32(flav);
2875                         ADJUST_ARGS();
2876                 }
2877         }
2878 out:
2879         if (exp)
2880                 exp_put(exp);
2881         return nfserr;
2882 }
2883
2884 /*
2885  * The SETATTR encode routine is special -- it always encodes a bitmap,
2886  * regardless of the error status.
2887  */
2888 static __be32
2889 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2890 {
2891         __be32 *p;
2892
2893         RESERVE_SPACE(12);
2894         if (nfserr) {
2895                 WRITE32(2);
2896                 WRITE32(0);
2897                 WRITE32(0);
2898         }
2899         else {
2900                 WRITE32(2);
2901                 WRITE32(setattr->sa_bmval[0]);
2902                 WRITE32(setattr->sa_bmval[1]);
2903         }
2904         ADJUST_ARGS();
2905         return nfserr;
2906 }
2907
2908 static __be32
2909 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2910 {
2911         __be32 *p;
2912
2913         if (!nfserr) {
2914                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2915                 WRITEMEM(&scd->se_clientid, 8);
2916                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2917                 ADJUST_ARGS();
2918         }
2919         else if (nfserr == nfserr_clid_inuse) {
2920                 RESERVE_SPACE(8);
2921                 WRITE32(0);
2922                 WRITE32(0);
2923                 ADJUST_ARGS();
2924         }
2925         return nfserr;
2926 }
2927
2928 static __be32
2929 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2930 {
2931         __be32 *p;
2932
2933         if (!nfserr) {
2934                 RESERVE_SPACE(16);
2935                 WRITE32(write->wr_bytes_written);
2936                 WRITE32(write->wr_how_written);
2937                 WRITEMEM(write->wr_verifier.data, 8);
2938                 ADJUST_ARGS();
2939         }
2940         return nfserr;
2941 }
2942
2943 static __be32
2944 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2945                          struct nfsd4_exchange_id *exid)
2946 {
2947         __be32 *p;
2948         char *major_id;
2949         char *server_scope;
2950         int major_id_sz;
2951         int server_scope_sz;
2952         uint64_t minor_id = 0;
2953
2954         if (nfserr)
2955                 return nfserr;
2956
2957         major_id = utsname()->nodename;
2958         major_id_sz = strlen(major_id);
2959         server_scope = utsname()->nodename;
2960         server_scope_sz = strlen(server_scope);
2961
2962         RESERVE_SPACE(
2963                 8 /* eir_clientid */ +
2964                 4 /* eir_sequenceid */ +
2965                 4 /* eir_flags */ +
2966                 4 /* spr_how (SP4_NONE) */ +
2967                 8 /* so_minor_id */ +
2968                 4 /* so_major_id.len */ +
2969                 (XDR_QUADLEN(major_id_sz) * 4) +
2970                 4 /* eir_server_scope.len */ +
2971                 (XDR_QUADLEN(server_scope_sz) * 4) +
2972                 4 /* eir_server_impl_id.count (0) */);
2973
2974         WRITEMEM(&exid->clientid, 8);
2975         WRITE32(exid->seqid);
2976         WRITE32(exid->flags);
2977
2978         /* state_protect4_r. Currently only support SP4_NONE */
2979         BUG_ON(exid->spa_how != SP4_NONE);
2980         WRITE32(exid->spa_how);
2981
2982         /* The server_owner struct */
2983         WRITE64(minor_id);      /* Minor id */
2984         /* major id */
2985         WRITE32(major_id_sz);
2986         WRITEMEM(major_id, major_id_sz);
2987
2988         /* Server scope */
2989         WRITE32(server_scope_sz);
2990         WRITEMEM(server_scope, server_scope_sz);
2991
2992         /* Implementation id */
2993         WRITE32(0);     /* zero length nfs_impl_id4 array */
2994         ADJUST_ARGS();
2995         return 0;
2996 }
2997
2998 static __be32
2999 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3000                             struct nfsd4_create_session *sess)
3001 {
3002         __be32 *p;
3003
3004         if (nfserr)
3005                 return nfserr;
3006
3007         RESERVE_SPACE(24);
3008         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3009         WRITE32(sess->seqid);
3010         WRITE32(sess->flags);
3011         ADJUST_ARGS();
3012
3013         RESERVE_SPACE(28);
3014         WRITE32(0); /* headerpadsz */
3015         WRITE32(sess->fore_channel.maxreq_sz);
3016         WRITE32(sess->fore_channel.maxresp_sz);
3017         WRITE32(sess->fore_channel.maxresp_cached);
3018         WRITE32(sess->fore_channel.maxops);
3019         WRITE32(sess->fore_channel.maxreqs);
3020         WRITE32(sess->fore_channel.nr_rdma_attrs);
3021         ADJUST_ARGS();
3022
3023         if (sess->fore_channel.nr_rdma_attrs) {
3024                 RESERVE_SPACE(4);
3025                 WRITE32(sess->fore_channel.rdma_attrs);
3026                 ADJUST_ARGS();
3027         }
3028
3029         RESERVE_SPACE(28);
3030         WRITE32(0); /* headerpadsz */
3031         WRITE32(sess->back_channel.maxreq_sz);
3032         WRITE32(sess->back_channel.maxresp_sz);
3033         WRITE32(sess->back_channel.maxresp_cached);
3034         WRITE32(sess->back_channel.maxops);
3035         WRITE32(sess->back_channel.maxreqs);
3036         WRITE32(sess->back_channel.nr_rdma_attrs);
3037         ADJUST_ARGS();
3038
3039         if (sess->back_channel.nr_rdma_attrs) {
3040                 RESERVE_SPACE(4);
3041                 WRITE32(sess->back_channel.rdma_attrs);
3042                 ADJUST_ARGS();
3043         }
3044         return 0;
3045 }
3046
3047 static __be32
3048 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3049                              struct nfsd4_destroy_session *destroy_session)
3050 {
3051         return nfserr;
3052 }
3053
3054 __be32
3055 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3056                       struct nfsd4_sequence *seq)
3057 {
3058         __be32 *p;
3059
3060         if (nfserr)
3061                 return nfserr;
3062
3063         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3064         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3065         WRITE32(seq->seqid);
3066         WRITE32(seq->slotid);
3067         WRITE32(seq->maxslots);
3068         /*
3069          * FIXME: for now:
3070          *   target_maxslots = maxslots
3071          *   status_flags = 0
3072          */
3073         WRITE32(seq->maxslots);
3074         WRITE32(0);
3075
3076         ADJUST_ARGS();
3077         return 0;
3078 }
3079
3080 static __be32
3081 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3082 {
3083         return nfserr;
3084 }
3085
3086 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3087
3088 /*
3089  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3090  * since we don't need to filter out obsolete ops as this is
3091  * done in the decoding phase.
3092  */
3093 static nfsd4_enc nfsd4_enc_ops[] = {
3094         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3095         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3096         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3097         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3098         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3099         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3100         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3101         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3102         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3103         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3104         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3105         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3106         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3107         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3108         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3109         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3110         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3111         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3112         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3113         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3114         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3115         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3116         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3117         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3118         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3119         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3120         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3121         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3122         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3123         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3124         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3125         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3126         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3127         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3128         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3129         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3130         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3131
3132         /* NFSv4.1 operations */
3133         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3134         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3135         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3136         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3137         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3138         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3139         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3140         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3141         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3142         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3143         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3144         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3145         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
3146         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3147         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3148         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3149         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3150         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3151         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3152 };
3153
3154 /*
3155  * Calculate the total amount of memory that the compound response has taken
3156  * after encoding the current operation.
3157  *
3158  * pad: add on 8 bytes for the next operation's op_code and status so that
3159  * there is room to cache a failure on the next operation.
3160  *
3161  * Compare this length to the session se_fmaxresp_cached.
3162  *
3163  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3164  * will be at least a page and will therefore hold the xdr_buf head.
3165  */
3166 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3167 {
3168         int status = 0;
3169         struct xdr_buf *xb = &resp->rqstp->rq_res;
3170         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3171         struct nfsd4_session *session = NULL;
3172         struct nfsd4_slot *slot = resp->cstate.slot;
3173         u32 length, tlen = 0, pad = 8;
3174
3175         if (!nfsd4_has_session(&resp->cstate))
3176                 return status;
3177
3178         session = resp->cstate.session;
3179         if (session == NULL || slot->sl_cache_entry.ce_cachethis == 0)
3180                 return status;
3181
3182         if (resp->opcnt >= args->opcnt)
3183                 pad = 0; /* this is the last operation */
3184
3185         if (xb->page_len == 0) {
3186                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3187         } else {
3188                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3189                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3190
3191                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3192         }
3193         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3194                 length, xb->page_len, tlen, pad);
3195
3196         if (length <= session->se_fmaxresp_cached)
3197                 return status;
3198         else
3199                 return nfserr_rep_too_big_to_cache;
3200 }
3201
3202 void
3203 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3204 {
3205         __be32 *statp;
3206         __be32 *p;
3207
3208         RESERVE_SPACE(8);
3209         WRITE32(op->opnum);
3210         statp = p++;    /* to be backfilled at the end */
3211         ADJUST_ARGS();
3212
3213         if (op->opnum == OP_ILLEGAL)
3214                 goto status;
3215         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3216                !nfsd4_enc_ops[op->opnum]);
3217         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3218         /* nfsd4_check_drc_limit guarantees enough room for error status */
3219         if (!op->status && nfsd4_check_drc_limit(resp))
3220                 op->status = nfserr_rep_too_big_to_cache;
3221 status:
3222         /*
3223          * Note: We write the status directly, instead of using WRITE32(),
3224          * since it is already in network byte order.
3225          */
3226         *statp = op->status;
3227 }
3228
3229 /*
3230  * Encode the reply stored in the stateowner reply cache
3231  *
3232  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3233  * previously sent already encoded operation.
3234  *
3235  * called with nfs4_lock_state() held
3236  */
3237 void
3238 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3239 {
3240         __be32 *p;
3241         struct nfs4_replay *rp = op->replay;
3242
3243         BUG_ON(!rp);
3244
3245         RESERVE_SPACE(8);
3246         WRITE32(op->opnum);
3247         *p++ = rp->rp_status;  /* already xdr'ed */
3248         ADJUST_ARGS();
3249
3250         RESERVE_SPACE(rp->rp_buflen);
3251         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3252         ADJUST_ARGS();
3253 }
3254
3255 /*
3256  * END OF "GENERIC" ENCODE ROUTINES.
3257  */
3258
3259 int
3260 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3261 {
3262         return xdr_ressize_check(rqstp, p);
3263 }
3264
3265 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3266 {
3267         if (args->ops != args->iops) {
3268                 kfree(args->ops);
3269                 args->ops = args->iops;
3270         }
3271         kfree(args->tmpp);
3272         args->tmpp = NULL;
3273         while (args->to_free) {
3274                 struct tmpbuf *tb = args->to_free;
3275                 args->to_free = tb->next;
3276                 tb->release(tb->buf);
3277                 kfree(tb);
3278         }
3279 }
3280
3281 int
3282 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3283 {
3284         __be32 status;
3285
3286         args->p = p;
3287         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3288         args->pagelist = rqstp->rq_arg.pages;
3289         args->pagelen = rqstp->rq_arg.page_len;
3290         args->tmpp = NULL;
3291         args->to_free = NULL;
3292         args->ops = args->iops;
3293         args->rqstp = rqstp;
3294
3295         status = nfsd4_decode_compound(args);
3296         if (status) {
3297                 nfsd4_release_compoundargs(args);
3298         }
3299         return !status;
3300 }
3301
3302 int
3303 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3304 {
3305         /*
3306          * All that remains is to write the tag and operation count...
3307          */
3308         struct kvec *iov;
3309         p = resp->tagp;
3310         *p++ = htonl(resp->taglen);
3311         memcpy(p, resp->tag, resp->taglen);
3312         p += XDR_QUADLEN(resp->taglen);
3313         *p++ = htonl(resp->opcnt);
3314
3315         if (rqstp->rq_res.page_len)
3316                 iov = &rqstp->rq_res.tail[0];
3317         else
3318                 iov = &rqstp->rq_res.head[0];
3319         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3320         BUG_ON(iov->iov_len > PAGE_SIZE);
3321         if (nfsd4_has_session(&resp->cstate)) {
3322                 if (resp->cstate.status == nfserr_replay_cache &&
3323                                 !nfsd4_not_cached(resp)) {
3324                         iov->iov_len = resp->cstate.iovlen;
3325                 } else {
3326                         nfsd4_store_cache_entry(resp);
3327                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3328                         resp->cstate.slot->sl_inuse = 0;
3329                 }
3330                 if (resp->cstate.session)
3331                         nfsd4_put_session(resp->cstate.session);
3332         }
3333         return 1;
3334 }
3335
3336 /*
3337  * Local variables:
3338  *  c-basic-offset: 8
3339  * End:
3340  */