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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 ENCODE_HEAD              __be32 *p
1507
1508 #define WRITE32(n)               *p++ = htonl(n)
1509 #define WRITE64(n)               do {                           \
1510         *p++ = htonl((u32)((n) >> 32));                         \
1511         *p++ = htonl((u32)(n));                                 \
1512 } while (0)
1513 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1514         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1515         memcpy(p, ptr, nbytes);                                 \
1516         p += XDR_QUADLEN(nbytes);                               \
1517 }} while (0)
1518 #define WRITECINFO(c)           do {                            \
1519         *p++ = htonl(c.atomic);                                 \
1520         *p++ = htonl(c.before_ctime_sec);                               \
1521         *p++ = htonl(c.before_ctime_nsec);                              \
1522         *p++ = htonl(c.after_ctime_sec);                                \
1523         *p++ = htonl(c.after_ctime_nsec);                               \
1524 } while (0)
1525
1526 #define RESERVE_SPACE(nbytes)   do {                            \
1527         p = resp->p;                                            \
1528         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1529 } while (0)
1530 #define ADJUST_ARGS()           resp->p = p
1531
1532 /*
1533  * Header routine to setup seqid operation replay cache
1534  */
1535 #define ENCODE_SEQID_OP_HEAD                                    \
1536         __be32 *save;                                           \
1537                                                                 \
1538         save = resp->p;
1539
1540 /*
1541  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1542  * is where sequence id's are incremented, and the replay cache is filled.
1543  * Note that we increment sequence id's here, at the last moment, so we're sure
1544  * we know whether the error to be returned is a sequence id mutating error.
1545  */
1546
1547 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1548         if (seqid_mutating_err(nfserr) && stateowner) {         \
1549                 stateowner->so_seqid++;                         \
1550                 stateowner->so_replay.rp_status = nfserr;       \
1551                 stateowner->so_replay.rp_buflen =               \
1552                           (((char *)(resp)->p - (char *)save)); \
1553                 memcpy(stateowner->so_replay.rp_buf, save,      \
1554                         stateowner->so_replay.rp_buflen);       \
1555         } } while (0);
1556
1557 /* Encode as an array of strings the string given with components
1558  * seperated @sep.
1559  */
1560 static __be32 nfsd4_encode_components(char sep, char *components,
1561                                    __be32 **pp, int *buflen)
1562 {
1563         __be32 *p = *pp;
1564         __be32 *countp = p;
1565         int strlen, count=0;
1566         char *str, *end;
1567
1568         dprintk("nfsd4_encode_components(%s)\n", components);
1569         if ((*buflen -= 4) < 0)
1570                 return nfserr_resource;
1571         WRITE32(0); /* We will fill this in with @count later */
1572         end = str = components;
1573         while (*end) {
1574                 for (; *end && (*end != sep); end++)
1575                         ; /* Point to end of component */
1576                 strlen = end - str;
1577                 if (strlen) {
1578                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1579                                 return nfserr_resource;
1580                         WRITE32(strlen);
1581                         WRITEMEM(str, strlen);
1582                         count++;
1583                 }
1584                 else
1585                         end++;
1586                 str = end;
1587         }
1588         *pp = p;
1589         p = countp;
1590         WRITE32(count);
1591         return 0;
1592 }
1593
1594 /*
1595  * encode a location element of a fs_locations structure
1596  */
1597 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1598                                     __be32 **pp, int *buflen)
1599 {
1600         __be32 status;
1601         __be32 *p = *pp;
1602
1603         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1604         if (status)
1605                 return status;
1606         status = nfsd4_encode_components('/', location->path, &p, buflen);
1607         if (status)
1608                 return status;
1609         *pp = p;
1610         return 0;
1611 }
1612
1613 /*
1614  * Return the path to an export point in the pseudo filesystem namespace
1615  * Returned string is safe to use as long as the caller holds a reference
1616  * to @exp.
1617  */
1618 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1619 {
1620         struct svc_fh tmp_fh;
1621         char *path, *rootpath;
1622
1623         fh_init(&tmp_fh, NFS4_FHSIZE);
1624         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1625         if (*stat)
1626                 return NULL;
1627         rootpath = tmp_fh.fh_export->ex_pathname;
1628
1629         path = exp->ex_pathname;
1630
1631         if (strncmp(path, rootpath, strlen(rootpath))) {
1632                 dprintk("nfsd: fs_locations failed;"
1633                         "%s is not contained in %s\n", path, rootpath);
1634                 *stat = nfserr_notsupp;
1635                 return NULL;
1636         }
1637
1638         return path + strlen(rootpath);
1639 }
1640
1641 /*
1642  *  encode a fs_locations structure
1643  */
1644 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1645                                      struct svc_export *exp,
1646                                      __be32 **pp, int *buflen)
1647 {
1648         __be32 status;
1649         int i;
1650         __be32 *p = *pp;
1651         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1652         char *root = nfsd4_path(rqstp, exp, &status);
1653
1654         if (status)
1655                 return status;
1656         status = nfsd4_encode_components('/', root, &p, buflen);
1657         if (status)
1658                 return status;
1659         if ((*buflen -= 4) < 0)
1660                 return nfserr_resource;
1661         WRITE32(fslocs->locations_count);
1662         for (i=0; i<fslocs->locations_count; i++) {
1663                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1664                                                    &p, buflen);
1665                 if (status)
1666                         return status;
1667         }
1668         *pp = p;
1669         return 0;
1670 }
1671
1672 static u32 nfs4_ftypes[16] = {
1673         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1674         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1675         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1676         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1677 };
1678
1679 static __be32
1680 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1681                         __be32 **p, int *buflen)
1682 {
1683         int status;
1684
1685         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1686                 return nfserr_resource;
1687         if (whotype != NFS4_ACL_WHO_NAMED)
1688                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1689         else if (group)
1690                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1691         else
1692                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1693         if (status < 0)
1694                 return nfserrno(status);
1695         *p = xdr_encode_opaque(*p, NULL, status);
1696         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1697         BUG_ON(*buflen < 0);
1698         return 0;
1699 }
1700
1701 static inline __be32
1702 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1703 {
1704         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1705 }
1706
1707 static inline __be32
1708 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1709 {
1710         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1711 }
1712
1713 static inline __be32
1714 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1715                 __be32 **p, int *buflen)
1716 {
1717         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1718 }
1719
1720 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1721                               FATTR4_WORD0_RDATTR_ERROR)
1722 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1723
1724 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1725 {
1726         /* As per referral draft:  */
1727         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1728             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1729                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1730                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1731                         *rdattr_err = NFSERR_MOVED;
1732                 else
1733                         return nfserr_moved;
1734         }
1735         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1736         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1737         return 0;
1738 }
1739
1740 /*
1741  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1742  * ourselves.
1743  *
1744  * @countp is the buffer size in _words_; upon successful return this becomes
1745  * replaced with the number of words written.
1746  */
1747 __be32
1748 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1749                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1750                 struct svc_rqst *rqstp, int ignore_crossmnt)
1751 {
1752         u32 bmval0 = bmval[0];
1753         u32 bmval1 = bmval[1];
1754         u32 bmval2 = bmval[2];
1755         struct kstat stat;
1756         struct svc_fh tempfh;
1757         struct kstatfs statfs;
1758         int buflen = *countp << 2;
1759         __be32 *attrlenp;
1760         u32 dummy;
1761         u64 dummy64;
1762         u32 rdattr_err = 0;
1763         __be32 *p = buffer;
1764         __be32 status;
1765         int err;
1766         int aclsupport = 0;
1767         struct nfs4_acl *acl = NULL;
1768         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1769         u32 minorversion = resp->cstate.minorversion;
1770
1771         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1772         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1773         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1774         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1775
1776         if (exp->ex_fslocs.migrated) {
1777                 BUG_ON(bmval[2]);
1778                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1779                 if (status)
1780                         goto out;
1781         }
1782
1783         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1784         if (err)
1785                 goto out_nfserr;
1786         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1787                         FATTR4_WORD0_MAXNAME)) ||
1788             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1789                        FATTR4_WORD1_SPACE_TOTAL))) {
1790                 err = vfs_statfs(dentry, &statfs);
1791                 if (err)
1792                         goto out_nfserr;
1793         }
1794         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1795                 fh_init(&tempfh, NFS4_FHSIZE);
1796                 status = fh_compose(&tempfh, exp, dentry, NULL);
1797                 if (status)
1798                         goto out;
1799                 fhp = &tempfh;
1800         }
1801         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1802                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1803                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1804                 aclsupport = (err == 0);
1805                 if (bmval0 & FATTR4_WORD0_ACL) {
1806                         if (err == -EOPNOTSUPP)
1807                                 bmval0 &= ~FATTR4_WORD0_ACL;
1808                         else if (err == -EINVAL) {
1809                                 status = nfserr_attrnotsupp;
1810                                 goto out;
1811                         } else if (err != 0)
1812                                 goto out_nfserr;
1813                 }
1814         }
1815         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1816                 if (exp->ex_fslocs.locations == NULL) {
1817                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1818                 }
1819         }
1820         if ((buflen -= 16) < 0)
1821                 goto out_resource;
1822
1823         if (unlikely(bmval2)) {
1824                 WRITE32(3);
1825                 WRITE32(bmval0);
1826                 WRITE32(bmval1);
1827                 WRITE32(bmval2);
1828         } else if (likely(bmval1)) {
1829                 WRITE32(2);
1830                 WRITE32(bmval0);
1831                 WRITE32(bmval1);
1832         } else {
1833                 WRITE32(1);
1834                 WRITE32(bmval0);
1835         }
1836         attrlenp = p++;                /* to be backfilled later */
1837
1838         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1839                 u32 word0 = nfsd_suppattrs0(minorversion);
1840                 u32 word1 = nfsd_suppattrs1(minorversion);
1841                 u32 word2 = nfsd_suppattrs2(minorversion);
1842
1843                 if ((buflen -= 12) < 0)
1844                         goto out_resource;
1845                 if (!aclsupport)
1846                         word0 &= ~FATTR4_WORD0_ACL;
1847                 if (!exp->ex_fslocs.locations)
1848                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1849                 if (!word2) {
1850                         WRITE32(2);
1851                         WRITE32(word0);
1852                         WRITE32(word1);
1853                 } else {
1854                         WRITE32(3);
1855                         WRITE32(word0);
1856                         WRITE32(word1);
1857                         WRITE32(word2);
1858                 }
1859         }
1860         if (bmval0 & FATTR4_WORD0_TYPE) {
1861                 if ((buflen -= 4) < 0)
1862                         goto out_resource;
1863                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1864                 if (dummy == NF4BAD)
1865                         goto out_serverfault;
1866                 WRITE32(dummy);
1867         }
1868         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1869                 if ((buflen -= 4) < 0)
1870                         goto out_resource;
1871                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1872                         WRITE32(NFS4_FH_PERSISTENT);
1873                 else
1874                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1875         }
1876         if (bmval0 & FATTR4_WORD0_CHANGE) {
1877                 /*
1878                  * Note: This _must_ be consistent with the scheme for writing
1879                  * change_info, so any changes made here must be reflected there
1880                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1881                  * macro above.)
1882                  */
1883                 if ((buflen -= 8) < 0)
1884                         goto out_resource;
1885                 WRITE32(stat.ctime.tv_sec);
1886                 WRITE32(stat.ctime.tv_nsec);
1887         }
1888         if (bmval0 & FATTR4_WORD0_SIZE) {
1889                 if ((buflen -= 8) < 0)
1890                         goto out_resource;
1891                 WRITE64(stat.size);
1892         }
1893         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1894                 if ((buflen -= 4) < 0)
1895                         goto out_resource;
1896                 WRITE32(1);
1897         }
1898         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1899                 if ((buflen -= 4) < 0)
1900                         goto out_resource;
1901                 WRITE32(1);
1902         }
1903         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1904                 if ((buflen -= 4) < 0)
1905                         goto out_resource;
1906                 WRITE32(0);
1907         }
1908         if (bmval0 & FATTR4_WORD0_FSID) {
1909                 if ((buflen -= 16) < 0)
1910                         goto out_resource;
1911                 if (exp->ex_fslocs.migrated) {
1912                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1913                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1914                 } else switch(fsid_source(fhp)) {
1915                 case FSIDSOURCE_FSID:
1916                         WRITE64((u64)exp->ex_fsid);
1917                         WRITE64((u64)0);
1918                         break;
1919                 case FSIDSOURCE_DEV:
1920                         WRITE32(0);
1921                         WRITE32(MAJOR(stat.dev));
1922                         WRITE32(0);
1923                         WRITE32(MINOR(stat.dev));
1924                         break;
1925                 case FSIDSOURCE_UUID:
1926                         WRITEMEM(exp->ex_uuid, 16);
1927                         break;
1928                 }
1929         }
1930         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1931                 if ((buflen -= 4) < 0)
1932                         goto out_resource;
1933                 WRITE32(0);
1934         }
1935         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1936                 if ((buflen -= 4) < 0)
1937                         goto out_resource;
1938                 WRITE32(NFSD_LEASE_TIME);
1939         }
1940         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1941                 if ((buflen -= 4) < 0)
1942                         goto out_resource;
1943                 WRITE32(rdattr_err);
1944         }
1945         if (bmval0 & FATTR4_WORD0_ACL) {
1946                 struct nfs4_ace *ace;
1947
1948                 if (acl == NULL) {
1949                         if ((buflen -= 4) < 0)
1950                                 goto out_resource;
1951
1952                         WRITE32(0);
1953                         goto out_acl;
1954                 }
1955                 if ((buflen -= 4) < 0)
1956                         goto out_resource;
1957                 WRITE32(acl->naces);
1958
1959                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1960                         if ((buflen -= 4*3) < 0)
1961                                 goto out_resource;
1962                         WRITE32(ace->type);
1963                         WRITE32(ace->flag);
1964                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1965                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1966                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1967                                 &p, &buflen);
1968                         if (status == nfserr_resource)
1969                                 goto out_resource;
1970                         if (status)
1971                                 goto out;
1972                 }
1973         }
1974 out_acl:
1975         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1976                 if ((buflen -= 4) < 0)
1977                         goto out_resource;
1978                 WRITE32(aclsupport ?
1979                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1980         }
1981         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1982                 if ((buflen -= 4) < 0)
1983                         goto out_resource;
1984                 WRITE32(1);
1985         }
1986         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1987                 if ((buflen -= 4) < 0)
1988                         goto out_resource;
1989                 WRITE32(1);
1990         }
1991         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1992                 if ((buflen -= 4) < 0)
1993                         goto out_resource;
1994                 WRITE32(1);
1995         }
1996         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1997                 if ((buflen -= 4) < 0)
1998                         goto out_resource;
1999                 WRITE32(1);
2000         }
2001         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2002                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2003                 if (buflen < 0)
2004                         goto out_resource;
2005                 WRITE32(fhp->fh_handle.fh_size);
2006                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2007         }
2008         if (bmval0 & FATTR4_WORD0_FILEID) {
2009                 if ((buflen -= 8) < 0)
2010                         goto out_resource;
2011                 WRITE64(stat.ino);
2012         }
2013         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2014                 if ((buflen -= 8) < 0)
2015                         goto out_resource;
2016                 WRITE64((u64) statfs.f_ffree);
2017         }
2018         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2019                 if ((buflen -= 8) < 0)
2020                         goto out_resource;
2021                 WRITE64((u64) statfs.f_ffree);
2022         }
2023         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2024                 if ((buflen -= 8) < 0)
2025                         goto out_resource;
2026                 WRITE64((u64) statfs.f_files);
2027         }
2028         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2029                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2030                 if (status == nfserr_resource)
2031                         goto out_resource;
2032                 if (status)
2033                         goto out;
2034         }
2035         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2036                 if ((buflen -= 4) < 0)
2037                         goto out_resource;
2038                 WRITE32(1);
2039         }
2040         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2041                 if ((buflen -= 8) < 0)
2042                         goto out_resource;
2043                 WRITE64(~(u64)0);
2044         }
2045         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2046                 if ((buflen -= 4) < 0)
2047                         goto out_resource;
2048                 WRITE32(255);
2049         }
2050         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2051                 if ((buflen -= 4) < 0)
2052                         goto out_resource;
2053                 WRITE32(statfs.f_namelen);
2054         }
2055         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2056                 if ((buflen -= 8) < 0)
2057                         goto out_resource;
2058                 WRITE64((u64) svc_max_payload(rqstp));
2059         }
2060         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2061                 if ((buflen -= 8) < 0)
2062                         goto out_resource;
2063                 WRITE64((u64) svc_max_payload(rqstp));
2064         }
2065         if (bmval1 & FATTR4_WORD1_MODE) {
2066                 if ((buflen -= 4) < 0)
2067                         goto out_resource;
2068                 WRITE32(stat.mode & S_IALLUGO);
2069         }
2070         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2071                 if ((buflen -= 4) < 0)
2072                         goto out_resource;
2073                 WRITE32(1);
2074         }
2075         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2076                 if ((buflen -= 4) < 0)
2077                         goto out_resource;
2078                 WRITE32(stat.nlink);
2079         }
2080         if (bmval1 & FATTR4_WORD1_OWNER) {
2081                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2082                 if (status == nfserr_resource)
2083                         goto out_resource;
2084                 if (status)
2085                         goto out;
2086         }
2087         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2088                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2089                 if (status == nfserr_resource)
2090                         goto out_resource;
2091                 if (status)
2092                         goto out;
2093         }
2094         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2095                 if ((buflen -= 8) < 0)
2096                         goto out_resource;
2097                 WRITE32((u32) MAJOR(stat.rdev));
2098                 WRITE32((u32) MINOR(stat.rdev));
2099         }
2100         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2101                 if ((buflen -= 8) < 0)
2102                         goto out_resource;
2103                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2104                 WRITE64(dummy64);
2105         }
2106         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2107                 if ((buflen -= 8) < 0)
2108                         goto out_resource;
2109                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2110                 WRITE64(dummy64);
2111         }
2112         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2113                 if ((buflen -= 8) < 0)
2114                         goto out_resource;
2115                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2116                 WRITE64(dummy64);
2117         }
2118         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2119                 if ((buflen -= 8) < 0)
2120                         goto out_resource;
2121                 dummy64 = (u64)stat.blocks << 9;
2122                 WRITE64(dummy64);
2123         }
2124         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2125                 if ((buflen -= 12) < 0)
2126                         goto out_resource;
2127                 WRITE32(0);
2128                 WRITE32(stat.atime.tv_sec);
2129                 WRITE32(stat.atime.tv_nsec);
2130         }
2131         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2132                 if ((buflen -= 12) < 0)
2133                         goto out_resource;
2134                 WRITE32(0);
2135                 WRITE32(1);
2136                 WRITE32(0);
2137         }
2138         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2139                 if ((buflen -= 12) < 0)
2140                         goto out_resource;
2141                 WRITE32(0);
2142                 WRITE32(stat.ctime.tv_sec);
2143                 WRITE32(stat.ctime.tv_nsec);
2144         }
2145         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2146                 if ((buflen -= 12) < 0)
2147                         goto out_resource;
2148                 WRITE32(0);
2149                 WRITE32(stat.mtime.tv_sec);
2150                 WRITE32(stat.mtime.tv_nsec);
2151         }
2152         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2153                 if ((buflen -= 8) < 0)
2154                         goto out_resource;
2155                 /*
2156                  * Get parent's attributes if not ignoring crossmount
2157                  * and this is the root of a cross-mounted filesystem.
2158                  */
2159                 if (ignore_crossmnt == 0 &&
2160                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
2161                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
2162                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
2163                         if (err)
2164                                 goto out_nfserr;
2165                 }
2166                 WRITE64(stat.ino);
2167         }
2168         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2169                 WRITE32(3);
2170                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2171                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2172                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2173         }
2174
2175         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2176         *countp = p - buffer;
2177         status = nfs_ok;
2178
2179 out:
2180         kfree(acl);
2181         if (fhp == &tempfh)
2182                 fh_put(&tempfh);
2183         return status;
2184 out_nfserr:
2185         status = nfserrno(err);
2186         goto out;
2187 out_resource:
2188         *countp = 0;
2189         status = nfserr_resource;
2190         goto out;
2191 out_serverfault:
2192         status = nfserr_serverfault;
2193         goto out;
2194 }
2195
2196 static inline int attributes_need_mount(u32 *bmval)
2197 {
2198         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2199                 return 1;
2200         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2201                 return 1;
2202         return 0;
2203 }
2204
2205 static __be32
2206 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2207                 const char *name, int namlen, __be32 *p, int *buflen)
2208 {
2209         struct svc_export *exp = cd->rd_fhp->fh_export;
2210         struct dentry *dentry;
2211         __be32 nfserr;
2212         int ignore_crossmnt = 0;
2213
2214         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2215         if (IS_ERR(dentry))
2216                 return nfserrno(PTR_ERR(dentry));
2217
2218         exp_get(exp);
2219         /*
2220          * In the case of a mountpoint, the client may be asking for
2221          * attributes that are only properties of the underlying filesystem
2222          * as opposed to the cross-mounted file system. In such a case,
2223          * we will not follow the cross mount and will fill the attribtutes
2224          * directly from the mountpoint dentry.
2225          */
2226         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
2227                 ignore_crossmnt = 1;
2228         else if (d_mountpoint(dentry)) {
2229                 int err;
2230
2231                 /*
2232                  * Why the heck aren't we just using nfsd_lookup??
2233                  * Different "."/".." handling?  Something else?
2234                  * At least, add a comment here to explain....
2235                  */
2236                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2237                 if (err) {
2238                         nfserr = nfserrno(err);
2239                         goto out_put;
2240                 }
2241                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2242                 if (nfserr)
2243                         goto out_put;
2244
2245         }
2246         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2247                                         cd->rd_rqstp, ignore_crossmnt);
2248 out_put:
2249         dput(dentry);
2250         exp_put(exp);
2251         return nfserr;
2252 }
2253
2254 static __be32 *
2255 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2256 {
2257         __be32 *attrlenp;
2258
2259         if (buflen < 6)
2260                 return NULL;
2261         *p++ = htonl(2);
2262         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2263         *p++ = htonl(0);                         /* bmval1 */
2264
2265         attrlenp = p++;
2266         *p++ = nfserr;       /* no htonl */
2267         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2268         return p;
2269 }
2270
2271 static int
2272 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2273                     loff_t offset, u64 ino, unsigned int d_type)
2274 {
2275         struct readdir_cd *ccd = ccdv;
2276         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2277         int buflen;
2278         __be32 *p = cd->buffer;
2279         __be32 nfserr = nfserr_toosmall;
2280
2281         /* In nfsv4, "." and ".." never make it onto the wire.. */
2282         if (name && isdotent(name, namlen)) {
2283                 cd->common.err = nfs_ok;
2284                 return 0;
2285         }
2286
2287         if (cd->offset)
2288                 xdr_encode_hyper(cd->offset, (u64) offset);
2289
2290         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2291         if (buflen < 0)
2292                 goto fail;
2293
2294         *p++ = xdr_one;                             /* mark entry present */
2295         cd->offset = p;                             /* remember pointer */
2296         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2297         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2298
2299         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2300         switch (nfserr) {
2301         case nfs_ok:
2302                 p += buflen;
2303                 break;
2304         case nfserr_resource:
2305                 nfserr = nfserr_toosmall;
2306                 goto fail;
2307         case nfserr_dropit:
2308                 goto fail;
2309         default:
2310                 /*
2311                  * If the client requested the RDATTR_ERROR attribute,
2312                  * we stuff the error code into this attribute
2313                  * and continue.  If this attribute was not requested,
2314                  * then in accordance with the spec, we fail the
2315                  * entire READDIR operation(!)
2316                  */
2317                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2318                         goto fail;
2319                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2320                 if (p == NULL) {
2321                         nfserr = nfserr_toosmall;
2322                         goto fail;
2323                 }
2324         }
2325         cd->buflen -= (p - cd->buffer);
2326         cd->buffer = p;
2327         cd->common.err = nfs_ok;
2328         return 0;
2329 fail:
2330         cd->common.err = nfserr;
2331         return -EINVAL;
2332 }
2333
2334 static void
2335 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2336 {
2337         ENCODE_HEAD;
2338
2339         RESERVE_SPACE(sizeof(stateid_t));
2340         WRITE32(sid->si_generation);
2341         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2342         ADJUST_ARGS();
2343 }
2344
2345 static __be32
2346 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2347 {
2348         ENCODE_HEAD;
2349
2350         if (!nfserr) {
2351                 RESERVE_SPACE(8);
2352                 WRITE32(access->ac_supported);
2353                 WRITE32(access->ac_resp_access);
2354                 ADJUST_ARGS();
2355         }
2356         return nfserr;
2357 }
2358
2359 static __be32
2360 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2361 {
2362         ENCODE_SEQID_OP_HEAD;
2363
2364         if (!nfserr)
2365                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2366
2367         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2368         return nfserr;
2369 }
2370
2371
2372 static __be32
2373 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2374 {
2375         ENCODE_HEAD;
2376
2377         if (!nfserr) {
2378                 RESERVE_SPACE(8);
2379                 WRITEMEM(commit->co_verf.data, 8);
2380                 ADJUST_ARGS();
2381         }
2382         return nfserr;
2383 }
2384
2385 static __be32
2386 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2387 {
2388         ENCODE_HEAD;
2389
2390         if (!nfserr) {
2391                 RESERVE_SPACE(32);
2392                 WRITECINFO(create->cr_cinfo);
2393                 WRITE32(2);
2394                 WRITE32(create->cr_bmval[0]);
2395                 WRITE32(create->cr_bmval[1]);
2396                 ADJUST_ARGS();
2397         }
2398         return nfserr;
2399 }
2400
2401 static __be32
2402 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2403 {
2404         struct svc_fh *fhp = getattr->ga_fhp;
2405         int buflen;
2406
2407         if (nfserr)
2408                 return nfserr;
2409
2410         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2411         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2412                                     resp->p, &buflen, getattr->ga_bmval,
2413                                     resp->rqstp, 0);
2414         if (!nfserr)
2415                 resp->p += buflen;
2416         return nfserr;
2417 }
2418
2419 static __be32
2420 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2421 {
2422         struct svc_fh *fhp = *fhpp;
2423         unsigned int len;
2424         ENCODE_HEAD;
2425
2426         if (!nfserr) {
2427                 len = fhp->fh_handle.fh_size;
2428                 RESERVE_SPACE(len + 4);
2429                 WRITE32(len);
2430                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2431                 ADJUST_ARGS();
2432         }
2433         return nfserr;
2434 }
2435
2436 /*
2437 * Including all fields other than the name, a LOCK4denied structure requires
2438 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2439 */
2440 static void
2441 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2442 {
2443         ENCODE_HEAD;
2444
2445         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2446         WRITE64(ld->ld_start);
2447         WRITE64(ld->ld_length);
2448         WRITE32(ld->ld_type);
2449         if (ld->ld_sop) {
2450                 WRITEMEM(&ld->ld_clientid, 8);
2451                 WRITE32(ld->ld_sop->so_owner.len);
2452                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2453                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2454         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2455                 WRITE64((u64)0); /* clientid */
2456                 WRITE32(0); /* length of owner name */
2457         }
2458         ADJUST_ARGS();
2459 }
2460
2461 static __be32
2462 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2463 {
2464         ENCODE_SEQID_OP_HEAD;
2465
2466         if (!nfserr)
2467                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2468         else if (nfserr == nfserr_denied)
2469                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2470
2471         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2472         return nfserr;
2473 }
2474
2475 static __be32
2476 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2477 {
2478         if (nfserr == nfserr_denied)
2479                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2480         return nfserr;
2481 }
2482
2483 static __be32
2484 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2485 {
2486         ENCODE_SEQID_OP_HEAD;
2487
2488         if (!nfserr)
2489                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2490
2491         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2492         return nfserr;
2493 }
2494
2495
2496 static __be32
2497 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2498 {
2499         ENCODE_HEAD;
2500
2501         if (!nfserr) {
2502                 RESERVE_SPACE(20);
2503                 WRITECINFO(link->li_cinfo);
2504                 ADJUST_ARGS();
2505         }
2506         return nfserr;
2507 }
2508
2509
2510 static __be32
2511 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2512 {
2513         ENCODE_HEAD;
2514         ENCODE_SEQID_OP_HEAD;
2515
2516         if (nfserr)
2517                 goto out;
2518
2519         nfsd4_encode_stateid(resp, &open->op_stateid);
2520         RESERVE_SPACE(40);
2521         WRITECINFO(open->op_cinfo);
2522         WRITE32(open->op_rflags);
2523         WRITE32(2);
2524         WRITE32(open->op_bmval[0]);
2525         WRITE32(open->op_bmval[1]);
2526         WRITE32(open->op_delegate_type);
2527         ADJUST_ARGS();
2528
2529         switch (open->op_delegate_type) {
2530         case NFS4_OPEN_DELEGATE_NONE:
2531                 break;
2532         case NFS4_OPEN_DELEGATE_READ:
2533                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2534                 RESERVE_SPACE(20);
2535                 WRITE32(open->op_recall);
2536
2537                 /*
2538                  * TODO: ACE's in delegations
2539                  */
2540                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2541                 WRITE32(0);
2542                 WRITE32(0);
2543                 WRITE32(0);   /* XXX: is NULL principal ok? */
2544                 ADJUST_ARGS();
2545                 break;
2546         case NFS4_OPEN_DELEGATE_WRITE:
2547                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2548                 RESERVE_SPACE(32);
2549                 WRITE32(0);
2550
2551                 /*
2552                  * TODO: space_limit's in delegations
2553                  */
2554                 WRITE32(NFS4_LIMIT_SIZE);
2555                 WRITE32(~(u32)0);
2556                 WRITE32(~(u32)0);
2557
2558                 /*
2559                  * TODO: ACE's in delegations
2560                  */
2561                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2562                 WRITE32(0);
2563                 WRITE32(0);
2564                 WRITE32(0);   /* XXX: is NULL principal ok? */
2565                 ADJUST_ARGS();
2566                 break;
2567         default:
2568                 BUG();
2569         }
2570         /* XXX save filehandle here */
2571 out:
2572         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2573         return nfserr;
2574 }
2575
2576 static __be32
2577 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2578 {
2579         ENCODE_SEQID_OP_HEAD;
2580
2581         if (!nfserr)
2582                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2583
2584         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2585         return nfserr;
2586 }
2587
2588 static __be32
2589 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2590 {
2591         ENCODE_SEQID_OP_HEAD;
2592
2593         if (!nfserr)
2594                 nfsd4_encode_stateid(resp, &od->od_stateid);
2595
2596         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2597         return nfserr;
2598 }
2599
2600 static __be32
2601 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2602                   struct nfsd4_read *read)
2603 {
2604         u32 eof;
2605         int v, pn;
2606         unsigned long maxcount;
2607         long len;
2608         ENCODE_HEAD;
2609
2610         if (nfserr)
2611                 return nfserr;
2612         if (resp->xbuf->page_len)
2613                 return nfserr_resource;
2614
2615         RESERVE_SPACE(8); /* eof flag and byte count */
2616
2617         maxcount = svc_max_payload(resp->rqstp);
2618         if (maxcount > read->rd_length)
2619                 maxcount = read->rd_length;
2620
2621         len = maxcount;
2622         v = 0;
2623         while (len > 0) {
2624                 pn = resp->rqstp->rq_resused++;
2625                 resp->rqstp->rq_vec[v].iov_base =
2626                         page_address(resp->rqstp->rq_respages[pn]);
2627                 resp->rqstp->rq_vec[v].iov_len =
2628                         len < PAGE_SIZE ? len : PAGE_SIZE;
2629                 v++;
2630                 len -= PAGE_SIZE;
2631         }
2632         read->rd_vlen = v;
2633
2634         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2635                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2636                         &maxcount);
2637
2638         if (nfserr == nfserr_symlink)
2639                 nfserr = nfserr_inval;
2640         if (nfserr)
2641                 return nfserr;
2642         eof = (read->rd_offset + maxcount >=
2643                read->rd_fhp->fh_dentry->d_inode->i_size);
2644
2645         WRITE32(eof);
2646         WRITE32(maxcount);
2647         ADJUST_ARGS();
2648         resp->xbuf->head[0].iov_len = (char*)p
2649                                         - (char*)resp->xbuf->head[0].iov_base;
2650         resp->xbuf->page_len = maxcount;
2651
2652         /* Use rest of head for padding and remaining ops: */
2653         resp->xbuf->tail[0].iov_base = p;
2654         resp->xbuf->tail[0].iov_len = 0;
2655         if (maxcount&3) {
2656                 RESERVE_SPACE(4);
2657                 WRITE32(0);
2658                 resp->xbuf->tail[0].iov_base += maxcount&3;
2659                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2660                 ADJUST_ARGS();
2661         }
2662         return 0;
2663 }
2664
2665 static __be32
2666 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2667 {
2668         int maxcount;
2669         char *page;
2670         ENCODE_HEAD;
2671
2672         if (nfserr)
2673                 return nfserr;
2674         if (resp->xbuf->page_len)
2675                 return nfserr_resource;
2676
2677         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2678
2679         maxcount = PAGE_SIZE;
2680         RESERVE_SPACE(4);
2681
2682         /*
2683          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2684          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2685          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2686          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2687          */
2688         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2689         if (nfserr == nfserr_isdir)
2690                 return nfserr_inval;
2691         if (nfserr)
2692                 return nfserr;
2693
2694         WRITE32(maxcount);
2695         ADJUST_ARGS();
2696         resp->xbuf->head[0].iov_len = (char*)p
2697                                 - (char*)resp->xbuf->head[0].iov_base;
2698         resp->xbuf->page_len = maxcount;
2699
2700         /* Use rest of head for padding and remaining ops: */
2701         resp->xbuf->tail[0].iov_base = p;
2702         resp->xbuf->tail[0].iov_len = 0;
2703         if (maxcount&3) {
2704                 RESERVE_SPACE(4);
2705                 WRITE32(0);
2706                 resp->xbuf->tail[0].iov_base += maxcount&3;
2707                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2708                 ADJUST_ARGS();
2709         }
2710         return 0;
2711 }
2712
2713 static __be32
2714 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2715 {
2716         int maxcount;
2717         loff_t offset;
2718         __be32 *page, *savep, *tailbase;
2719         ENCODE_HEAD;
2720
2721         if (nfserr)
2722                 return nfserr;
2723         if (resp->xbuf->page_len)
2724                 return nfserr_resource;
2725
2726         RESERVE_SPACE(8);  /* verifier */
2727         savep = p;
2728
2729         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2730         WRITE32(0);
2731         WRITE32(0);
2732         ADJUST_ARGS();
2733         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2734         tailbase = p;
2735
2736         maxcount = PAGE_SIZE;
2737         if (maxcount > readdir->rd_maxcount)
2738                 maxcount = readdir->rd_maxcount;
2739
2740         /*
2741          * Convert from bytes to words, account for the two words already
2742          * written, make sure to leave two words at the end for the next
2743          * pointer and eof field.
2744          */
2745         maxcount = (maxcount >> 2) - 4;
2746         if (maxcount < 0) {
2747                 nfserr =  nfserr_toosmall;
2748                 goto err_no_verf;
2749         }
2750
2751         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2752         readdir->common.err = 0;
2753         readdir->buflen = maxcount;
2754         readdir->buffer = page;
2755         readdir->offset = NULL;
2756
2757         offset = readdir->rd_cookie;
2758         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2759                               &offset,
2760                               &readdir->common, nfsd4_encode_dirent);
2761         if (nfserr == nfs_ok &&
2762             readdir->common.err == nfserr_toosmall &&
2763             readdir->buffer == page)
2764                 nfserr = nfserr_toosmall;
2765         if (nfserr == nfserr_symlink)
2766                 nfserr = nfserr_notdir;
2767         if (nfserr)
2768                 goto err_no_verf;
2769
2770         if (readdir->offset)
2771                 xdr_encode_hyper(readdir->offset, offset);
2772
2773         p = readdir->buffer;
2774         *p++ = 0;       /* no more entries */
2775         *p++ = htonl(readdir->common.err == nfserr_eof);
2776         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2777                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2778
2779         /* Use rest of head for padding and remaining ops: */
2780         resp->xbuf->tail[0].iov_base = tailbase;
2781         resp->xbuf->tail[0].iov_len = 0;
2782         resp->p = resp->xbuf->tail[0].iov_base;
2783         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2784
2785         return 0;
2786 err_no_verf:
2787         p = savep;
2788         ADJUST_ARGS();
2789         return nfserr;
2790 }
2791
2792 static __be32
2793 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2794 {
2795         ENCODE_HEAD;
2796
2797         if (!nfserr) {
2798                 RESERVE_SPACE(20);
2799                 WRITECINFO(remove->rm_cinfo);
2800                 ADJUST_ARGS();
2801         }
2802         return nfserr;
2803 }
2804
2805 static __be32
2806 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2807 {
2808         ENCODE_HEAD;
2809
2810         if (!nfserr) {
2811                 RESERVE_SPACE(40);
2812                 WRITECINFO(rename->rn_sinfo);
2813                 WRITECINFO(rename->rn_tinfo);
2814                 ADJUST_ARGS();
2815         }
2816         return nfserr;
2817 }
2818
2819 static __be32
2820 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2821                      struct nfsd4_secinfo *secinfo)
2822 {
2823         int i = 0;
2824         struct svc_export *exp = secinfo->si_exp;
2825         u32 nflavs;
2826         struct exp_flavor_info *flavs;
2827         struct exp_flavor_info def_flavs[2];
2828         ENCODE_HEAD;
2829
2830         if (nfserr)
2831                 goto out;
2832         if (exp->ex_nflavors) {
2833                 flavs = exp->ex_flavors;
2834                 nflavs = exp->ex_nflavors;
2835         } else { /* Handling of some defaults in absence of real secinfo: */
2836                 flavs = def_flavs;
2837                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2838                         nflavs = 2;
2839                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2840                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2841                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2842                         nflavs = 1;
2843                         flavs[0].pseudoflavor
2844                                         = svcauth_gss_flavor(exp->ex_client);
2845                 } else {
2846                         nflavs = 1;
2847                         flavs[0].pseudoflavor
2848                                         = exp->ex_client->flavour->flavour;
2849                 }
2850         }
2851
2852         RESERVE_SPACE(4);
2853         WRITE32(nflavs);
2854         ADJUST_ARGS();
2855         for (i = 0; i < nflavs; i++) {
2856                 u32 flav = flavs[i].pseudoflavor;
2857                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2858
2859                 if (gm) {
2860                         RESERVE_SPACE(4);
2861                         WRITE32(RPC_AUTH_GSS);
2862                         ADJUST_ARGS();
2863                         RESERVE_SPACE(4 + gm->gm_oid.len);
2864                         WRITE32(gm->gm_oid.len);
2865                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2866                         ADJUST_ARGS();
2867                         RESERVE_SPACE(4);
2868                         WRITE32(0); /* qop */
2869                         ADJUST_ARGS();
2870                         RESERVE_SPACE(4);
2871                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2872                         ADJUST_ARGS();
2873                         gss_mech_put(gm);
2874                 } else {
2875                         RESERVE_SPACE(4);
2876                         WRITE32(flav);
2877                         ADJUST_ARGS();
2878                 }
2879         }
2880 out:
2881         if (exp)
2882                 exp_put(exp);
2883         return nfserr;
2884 }
2885
2886 /*
2887  * The SETATTR encode routine is special -- it always encodes a bitmap,
2888  * regardless of the error status.
2889  */
2890 static __be32
2891 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2892 {
2893         ENCODE_HEAD;
2894
2895         RESERVE_SPACE(12);
2896         if (nfserr) {
2897                 WRITE32(2);
2898                 WRITE32(0);
2899                 WRITE32(0);
2900         }
2901         else {
2902                 WRITE32(2);
2903                 WRITE32(setattr->sa_bmval[0]);
2904                 WRITE32(setattr->sa_bmval[1]);
2905         }
2906         ADJUST_ARGS();
2907         return nfserr;
2908 }
2909
2910 static __be32
2911 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2912 {
2913         ENCODE_HEAD;
2914
2915         if (!nfserr) {
2916                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2917                 WRITEMEM(&scd->se_clientid, 8);
2918                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2919                 ADJUST_ARGS();
2920         }
2921         else if (nfserr == nfserr_clid_inuse) {
2922                 RESERVE_SPACE(8);
2923                 WRITE32(0);
2924                 WRITE32(0);
2925                 ADJUST_ARGS();
2926         }
2927         return nfserr;
2928 }
2929
2930 static __be32
2931 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2932 {
2933         ENCODE_HEAD;
2934
2935         if (!nfserr) {
2936                 RESERVE_SPACE(16);
2937                 WRITE32(write->wr_bytes_written);
2938                 WRITE32(write->wr_how_written);
2939                 WRITEMEM(write->wr_verifier.data, 8);
2940                 ADJUST_ARGS();
2941         }
2942         return nfserr;
2943 }
2944
2945 static __be32
2946 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2947                          struct nfsd4_exchange_id *exid)
2948 {
2949         ENCODE_HEAD;
2950         char *major_id;
2951         char *server_scope;
2952         int major_id_sz;
2953         int server_scope_sz;
2954         uint64_t minor_id = 0;
2955
2956         if (nfserr)
2957                 return nfserr;
2958
2959         major_id = utsname()->nodename;
2960         major_id_sz = strlen(major_id);
2961         server_scope = utsname()->nodename;
2962         server_scope_sz = strlen(server_scope);
2963
2964         RESERVE_SPACE(
2965                 8 /* eir_clientid */ +
2966                 4 /* eir_sequenceid */ +
2967                 4 /* eir_flags */ +
2968                 4 /* spr_how (SP4_NONE) */ +
2969                 8 /* so_minor_id */ +
2970                 4 /* so_major_id.len */ +
2971                 (XDR_QUADLEN(major_id_sz) * 4) +
2972                 4 /* eir_server_scope.len */ +
2973                 (XDR_QUADLEN(server_scope_sz) * 4) +
2974                 4 /* eir_server_impl_id.count (0) */);
2975
2976         WRITEMEM(&exid->clientid, 8);
2977         WRITE32(exid->seqid);
2978         WRITE32(exid->flags);
2979
2980         /* state_protect4_r. Currently only support SP4_NONE */
2981         BUG_ON(exid->spa_how != SP4_NONE);
2982         WRITE32(exid->spa_how);
2983
2984         /* The server_owner struct */
2985         WRITE64(minor_id);      /* Minor id */
2986         /* major id */
2987         WRITE32(major_id_sz);
2988         WRITEMEM(major_id, major_id_sz);
2989
2990         /* Server scope */
2991         WRITE32(server_scope_sz);
2992         WRITEMEM(server_scope, server_scope_sz);
2993
2994         /* Implementation id */
2995         WRITE32(0);     /* zero length nfs_impl_id4 array */
2996         ADJUST_ARGS();
2997         return 0;
2998 }
2999
3000 static __be32
3001 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3002                             struct nfsd4_create_session *sess)
3003 {
3004         ENCODE_HEAD;
3005
3006         if (nfserr)
3007                 return nfserr;
3008
3009         RESERVE_SPACE(24);
3010         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3011         WRITE32(sess->seqid);
3012         WRITE32(sess->flags);
3013         ADJUST_ARGS();
3014
3015         RESERVE_SPACE(28);
3016         WRITE32(0); /* headerpadsz */
3017         WRITE32(sess->fore_channel.maxreq_sz);
3018         WRITE32(sess->fore_channel.maxresp_sz);
3019         WRITE32(sess->fore_channel.maxresp_cached);
3020         WRITE32(sess->fore_channel.maxops);
3021         WRITE32(sess->fore_channel.maxreqs);
3022         WRITE32(sess->fore_channel.nr_rdma_attrs);
3023         ADJUST_ARGS();
3024
3025         if (sess->fore_channel.nr_rdma_attrs) {
3026                 RESERVE_SPACE(4);
3027                 WRITE32(sess->fore_channel.rdma_attrs);
3028                 ADJUST_ARGS();
3029         }
3030
3031         RESERVE_SPACE(28);
3032         WRITE32(0); /* headerpadsz */
3033         WRITE32(sess->back_channel.maxreq_sz);
3034         WRITE32(sess->back_channel.maxresp_sz);
3035         WRITE32(sess->back_channel.maxresp_cached);
3036         WRITE32(sess->back_channel.maxops);
3037         WRITE32(sess->back_channel.maxreqs);
3038         WRITE32(sess->back_channel.nr_rdma_attrs);
3039         ADJUST_ARGS();
3040
3041         if (sess->back_channel.nr_rdma_attrs) {
3042                 RESERVE_SPACE(4);
3043                 WRITE32(sess->back_channel.rdma_attrs);
3044                 ADJUST_ARGS();
3045         }
3046         return 0;
3047 }
3048
3049 static __be32
3050 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3051                              struct nfsd4_destroy_session *destroy_session)
3052 {
3053         return nfserr;
3054 }
3055
3056 __be32
3057 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3058                       struct nfsd4_sequence *seq)
3059 {
3060         ENCODE_HEAD;
3061
3062         if (nfserr)
3063                 return nfserr;
3064
3065         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3066         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3067         WRITE32(seq->seqid);
3068         WRITE32(seq->slotid);
3069         WRITE32(seq->maxslots);
3070         /*
3071          * FIXME: for now:
3072          *   target_maxslots = maxslots
3073          *   status_flags = 0
3074          */
3075         WRITE32(seq->maxslots);
3076         WRITE32(0);
3077
3078         ADJUST_ARGS();
3079         return 0;
3080 }
3081
3082 static __be32
3083 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3084 {
3085         return nfserr;
3086 }
3087
3088 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3089
3090 /*
3091  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3092  * since we don't need to filter out obsolete ops as this is
3093  * done in the decoding phase.
3094  */
3095 static nfsd4_enc nfsd4_enc_ops[] = {
3096         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3097         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3098         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3099         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3100         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3101         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3102         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3103         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3104         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3105         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3106         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3107         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3108         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3109         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3110         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3111         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3112         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3113         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3114         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3115         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3116         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3117         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3118         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3119         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3120         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3121         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3122         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3123         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3124         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3125         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3126         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3127         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3128         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3129         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3130         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3131         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3132         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3133
3134         /* NFSv4.1 operations */
3135         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3136         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3137         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3138         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3139         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3140         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3141         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3142         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3143         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3144         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3145         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3146         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3147         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
3148         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3149         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3150         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3151         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3152         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3153         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3154 };
3155
3156 /*
3157  * Calculate the total amount of memory that the compound response has taken
3158  * after encoding the current operation.
3159  *
3160  * pad: add on 8 bytes for the next operation's op_code and status so that
3161  * there is room to cache a failure on the next operation.
3162  *
3163  * Compare this length to the session se_fmaxresp_cached.
3164  *
3165  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3166  * will be at least a page and will therefore hold the xdr_buf head.
3167  */
3168 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3169 {
3170         int status = 0;
3171         struct xdr_buf *xb = &resp->rqstp->rq_res;
3172         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3173         struct nfsd4_session *session = NULL;
3174         struct nfsd4_slot *slot = resp->cstate.slot;
3175         u32 length, tlen = 0, pad = 8;
3176
3177         if (!nfsd4_has_session(&resp->cstate))
3178                 return status;
3179
3180         session = resp->cstate.session;
3181         if (session == NULL || slot->sl_cache_entry.ce_cachethis == 0)
3182                 return status;
3183
3184         if (resp->opcnt >= args->opcnt)
3185                 pad = 0; /* this is the last operation */
3186
3187         if (xb->page_len == 0) {
3188                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3189         } else {
3190                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3191                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3192
3193                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3194         }
3195         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3196                 length, xb->page_len, tlen, pad);
3197
3198         if (length <= session->se_fmaxresp_cached)
3199                 return status;
3200         else
3201                 return nfserr_rep_too_big_to_cache;
3202 }
3203
3204 void
3205 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3206 {
3207         __be32 *statp;
3208         ENCODE_HEAD;
3209
3210         RESERVE_SPACE(8);
3211         WRITE32(op->opnum);
3212         statp = p++;    /* to be backfilled at the end */
3213         ADJUST_ARGS();
3214
3215         if (op->opnum == OP_ILLEGAL)
3216                 goto status;
3217         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3218                !nfsd4_enc_ops[op->opnum]);
3219         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3220         /* nfsd4_check_drc_limit guarantees enough room for error status */
3221         if (!op->status && nfsd4_check_drc_limit(resp))
3222                 op->status = nfserr_rep_too_big_to_cache;
3223 status:
3224         /*
3225          * Note: We write the status directly, instead of using WRITE32(),
3226          * since it is already in network byte order.
3227          */
3228         *statp = op->status;
3229 }
3230
3231 /*
3232  * Encode the reply stored in the stateowner reply cache
3233  *
3234  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3235  * previously sent already encoded operation.
3236  *
3237  * called with nfs4_lock_state() held
3238  */
3239 void
3240 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3241 {
3242         ENCODE_HEAD;
3243         struct nfs4_replay *rp = op->replay;
3244
3245         BUG_ON(!rp);
3246
3247         RESERVE_SPACE(8);
3248         WRITE32(op->opnum);
3249         *p++ = rp->rp_status;  /* already xdr'ed */
3250         ADJUST_ARGS();
3251
3252         RESERVE_SPACE(rp->rp_buflen);
3253         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3254         ADJUST_ARGS();
3255 }
3256
3257 /*
3258  * END OF "GENERIC" ENCODE ROUTINES.
3259  */
3260
3261 int
3262 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3263 {
3264         return xdr_ressize_check(rqstp, p);
3265 }
3266
3267 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3268 {
3269         if (args->ops != args->iops) {
3270                 kfree(args->ops);
3271                 args->ops = args->iops;
3272         }
3273         kfree(args->tmpp);
3274         args->tmpp = NULL;
3275         while (args->to_free) {
3276                 struct tmpbuf *tb = args->to_free;
3277                 args->to_free = tb->next;
3278                 tb->release(tb->buf);
3279                 kfree(tb);
3280         }
3281 }
3282
3283 int
3284 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3285 {
3286         __be32 status;
3287
3288         args->p = p;
3289         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3290         args->pagelist = rqstp->rq_arg.pages;
3291         args->pagelen = rqstp->rq_arg.page_len;
3292         args->tmpp = NULL;
3293         args->to_free = NULL;
3294         args->ops = args->iops;
3295         args->rqstp = rqstp;
3296
3297         status = nfsd4_decode_compound(args);
3298         if (status) {
3299                 nfsd4_release_compoundargs(args);
3300         }
3301         return !status;
3302 }
3303
3304 int
3305 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3306 {
3307         /*
3308          * All that remains is to write the tag and operation count...
3309          */
3310         struct kvec *iov;
3311         p = resp->tagp;
3312         *p++ = htonl(resp->taglen);
3313         memcpy(p, resp->tag, resp->taglen);
3314         p += XDR_QUADLEN(resp->taglen);
3315         *p++ = htonl(resp->opcnt);
3316
3317         if (rqstp->rq_res.page_len)
3318                 iov = &rqstp->rq_res.tail[0];
3319         else
3320                 iov = &rqstp->rq_res.head[0];
3321         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3322         BUG_ON(iov->iov_len > PAGE_SIZE);
3323         if (nfsd4_has_session(&resp->cstate)) {
3324                 if (resp->cstate.status == nfserr_replay_cache &&
3325                                 !nfsd4_not_cached(resp)) {
3326                         iov->iov_len = resp->cstate.iovlen;
3327                 } else {
3328                         nfsd4_store_cache_entry(resp);
3329                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3330                         resp->cstate.slot->sl_inuse = 0;
3331                 }
3332                 if (resp->cstate.session)
3333                         nfsd4_put_session(resp->cstate.session);
3334         }
3335         return 1;
3336 }
3337
3338 /*
3339  * Local variables:
3340  *  c-basic-offset: 8
3341  * End:
3342  */