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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
 193 defer_free(struct nfsd4_compoundargs *argp,
 194                 void (*release)(const void *), void *p)
 195 {
 196         struct tmpbuf *tb;
 197
 198         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 199         if (!tb)
 200                 return -ENOMEM;
 201         tb->buf = p;
 202         tb->release = release;
 203         tb->next = argp->to_free;
 204         argp->to_free = tb;
 205         return 0;
 206 }
 207
 208 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 209 {
 210         if (p == argp->tmp) {
 211                 p = kmalloc(nbytes, GFP_KERNEL);
 212                 if (!p)
 213                         return NULL;
 214                 memcpy(p, argp->tmp, nbytes);
 215         } else {
 216                 BUG_ON(p != argp->tmpp);
 217                 argp->tmpp = NULL;
 218         }
 219         if (defer_free(argp, kfree, p)) {
 220                 kfree(p);
 221                 return NULL;
 222         } else
 223                 return (char *)p;
 224 }
 225
 226 static __be32
 227 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 228 {
 229         u32 bmlen;
 230         DECODE_HEAD;
 231
 232         bmval[0] = 0;
 233         bmval[1] = 0;
 234
 235         READ_BUF(4);
 236         READ32(bmlen);
 237         if (bmlen > 1000)
 238                 goto xdr_error;
 239
 240         READ_BUF(bmlen << 2);
 241         if (bmlen > 0)
 242                 READ32(bmval[0]);
 243         if (bmlen > 1)
 244                 READ32(bmval[1]);
 245
 246         DECODE_TAIL;
 247 }
 248
 249 static __be32
 250 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 251     struct nfs4_acl **acl)
 252 {
 253         int expected_len, len = 0;
 254         u32 dummy32;
 255         char *buf;
 256         int host_err;
 257
 258         DECODE_HEAD;
 259         iattr->ia_valid = 0;
 260         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 261                 return status;
 262
 263         /*
 264          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
 265          * read-only attributes return ERR_INVAL.
 266          */
 267         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 268                 return nfserr_attrnotsupp;
 269         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 270                 return nfserr_inval;
 271
 272         READ_BUF(4);
 273         READ32(expected_len);
 274
 275         if (bmval[0] & FATTR4_WORD0_SIZE) {
 276                 READ_BUF(8);
 277                 len += 8;
 278                 READ64(iattr->ia_size);
 279                 iattr->ia_valid |= ATTR_SIZE;
 280         }
 281         if (bmval[0] & FATTR4_WORD0_ACL) {
 282                 int nace;
 283                 struct nfs4_ace *ace;
 284
 285                 READ_BUF(4); len += 4;
 286                 READ32(nace);
 287
 288                 if (nace > NFS4_ACL_MAX)
 289                         return nfserr_resource;
 290
 291                 *acl = nfs4_acl_new(nace);
 292                 if (*acl == NULL) {
 293                         host_err = -ENOMEM;
 294                         goto out_nfserr;
 295                 }
 296                 defer_free(argp, kfree, *acl);
 297
 298                 (*acl)->naces = nace;
 299                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 300                         READ_BUF(16); len += 16;
 301                         READ32(ace->type);
 302                         READ32(ace->flag);
 303                         READ32(ace->access_mask);
 304                         READ32(dummy32);
 305                         READ_BUF(dummy32);
 306                         len += XDR_QUADLEN(dummy32) << 2;
 307                         READMEM(buf, dummy32);
 308                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 309                         host_err = 0;
 310                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 311                                 ace->who = 0;
 312                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 313                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 314                                                 buf, dummy32, &ace->who);
 315                         else
 316                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 317                                                 buf, dummy32, &ace->who);
 318                         if (host_err)
 319                                 goto out_nfserr;
 320                 }
 321         } else
 322                 *acl = NULL;
 323         if (bmval[1] & FATTR4_WORD1_MODE) {
 324                 READ_BUF(4);
 325                 len += 4;
 326                 READ32(iattr->ia_mode);
 327                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 328                 iattr->ia_valid |= ATTR_MODE;
 329         }
 330         if (bmval[1] & FATTR4_WORD1_OWNER) {
 331                 READ_BUF(4);
 332                 len += 4;
 333                 READ32(dummy32);
 334                 READ_BUF(dummy32);
 335                 len += (XDR_QUADLEN(dummy32) << 2);
 336                 READMEM(buf, dummy32);
 337                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 338                         goto out_nfserr;
 339                 iattr->ia_valid |= ATTR_UID;
 340         }
 341         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 342                 READ_BUF(4);
 343                 len += 4;
 344                 READ32(dummy32);
 345                 READ_BUF(dummy32);
 346                 len += (XDR_QUADLEN(dummy32) << 2);
 347                 READMEM(buf, dummy32);
 348                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 349                         goto out_nfserr;
 350                 iattr->ia_valid |= ATTR_GID;
 351         }
 352         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 353                 READ_BUF(4);
 354                 len += 4;
 355                 READ32(dummy32);
 356                 switch (dummy32) {
 357                 case NFS4_SET_TO_CLIENT_TIME:
 358                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 359                            all 32 bits of 'nseconds'. */
 360                         READ_BUF(12);
 361                         len += 12;
 362                         READ32(dummy32);
 363                         if (dummy32)
 364                                 return nfserr_inval;
 365                         READ32(iattr->ia_atime.tv_sec);
 366                         READ32(iattr->ia_atime.tv_nsec);
 367                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 368                                 return nfserr_inval;
 369                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 370                         break;
 371                 case NFS4_SET_TO_SERVER_TIME:
 372                         iattr->ia_valid |= ATTR_ATIME;
 373                         break;
 374                 default:
 375                         goto xdr_error;
 376                 }
 377         }
 378         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 379                 READ_BUF(4);
 380                 len += 4;
 381                 READ32(dummy32);
 382                 switch (dummy32) {
 383                 case NFS4_SET_TO_CLIENT_TIME:
 384                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 385                            all 32 bits of 'nseconds'. */
 386                         READ_BUF(12);
 387                         len += 12;
 388                         READ32(dummy32);
 389                         if (dummy32)
 390                                 return nfserr_inval;
 391                         READ32(iattr->ia_mtime.tv_sec);
 392                         READ32(iattr->ia_mtime.tv_nsec);
 393                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 394                                 return nfserr_inval;
 395                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 396                         break;
 397                 case NFS4_SET_TO_SERVER_TIME:
 398                         iattr->ia_valid |= ATTR_MTIME;
 399                         break;
 400                 default:
 401                         goto xdr_error;
 402                 }
 403         }
 404         if (len != expected_len)
 405                 goto xdr_error;
 406
 407         DECODE_TAIL;
 408
 409 out_nfserr:
 410         status = nfserrno(host_err);
 411         goto out;
 412 }
 413
 414 static __be32
 415 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 416 {
 417         DECODE_HEAD;
 418
 419         READ_BUF(sizeof(stateid_t));
 420         READ32(sid->si_generation);
 421         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 422
 423         DECODE_TAIL;
 424 }
 425
 426 static __be32
 427 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 428 {
 429         DECODE_HEAD;
 430
 431         READ_BUF(4);
 432         READ32(access->ac_req_access);
 433
 434         DECODE_TAIL;
 435 }
 436
 437 static __be32
 438 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 439 {
 440         DECODE_HEAD;
 441
 442         close->cl_stateowner = NULL;
 443         READ_BUF(4);
 444         READ32(close->cl_seqid);
 445         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 446
 447         DECODE_TAIL;
 448 }
 449
 450
 451 static __be32
 452 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 453 {
 454         DECODE_HEAD;
 455
 456         READ_BUF(12);
 457         READ64(commit->co_offset);
 458         READ32(commit->co_count);
 459
 460         DECODE_TAIL;
 461 }
 462
 463 static __be32
 464 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 465 {
 466         DECODE_HEAD;
 467
 468         READ_BUF(4);
 469         READ32(create->cr_type);
 470         switch (create->cr_type) {
 471         case NF4LNK:
 472                 READ_BUF(4);
 473                 READ32(create->cr_linklen);
 474                 READ_BUF(create->cr_linklen);
 475                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 476                 break;
 477         case NF4BLK:
 478         case NF4CHR:
 479                 READ_BUF(8);
 480                 READ32(create->cr_specdata1);
 481                 READ32(create->cr_specdata2);
 482                 break;
 483         case NF4SOCK:
 484         case NF4FIFO:
 485         case NF4DIR:
 486         default:
 487                 break;
 488         }
 489
 490         READ_BUF(4);
 491         READ32(create->cr_namelen);
 492         READ_BUF(create->cr_namelen);
 493         SAVEMEM(create->cr_name, create->cr_namelen);
 494         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 495                 return status;
 496
 497         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 498                 goto out;
 499
 500         DECODE_TAIL;
 501 }
 502
 503 static inline __be32
 504 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 505 {
 506         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 507 }
 508
 509 static inline __be32
 510 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 511 {
 512         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 513 }
 514
 515 static __be32
 516 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 517 {
 518         DECODE_HEAD;
 519
 520         READ_BUF(4);
 521         READ32(link->li_namelen);
 522         READ_BUF(link->li_namelen);
 523         SAVEMEM(link->li_name, link->li_namelen);
 524         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 525                 return status;
 526
 527         DECODE_TAIL;
 528 }
 529
 530 static __be32
 531 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 532 {
 533         DECODE_HEAD;
 534
 535         lock->lk_replay_owner = NULL;
 536         /*
 537         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 538         */
 539         READ_BUF(28);
 540         READ32(lock->lk_type);
 541         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 542                 goto xdr_error;
 543         READ32(lock->lk_reclaim);
 544         READ64(lock->lk_offset);
 545         READ64(lock->lk_length);
 546         READ32(lock->lk_is_new);
 547
 548         if (lock->lk_is_new) {
 549                 READ_BUF(4);
 550                 READ32(lock->lk_new_open_seqid);
 551                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 552                 if (status)
 553                         return status;
 554                 READ_BUF(8 + sizeof(clientid_t));
 555                 READ32(lock->lk_new_lock_seqid);
 556                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 557                 READ32(lock->lk_new_owner.len);
 558                 READ_BUF(lock->lk_new_owner.len);
 559                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 560         } else {
 561                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 562                 if (status)
 563                         return status;
 564                 READ_BUF(4);
 565                 READ32(lock->lk_old_lock_seqid);
 566         }
 567
 568         DECODE_TAIL;
 569 }
 570
 571 static __be32
 572 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 573 {
 574         DECODE_HEAD;
 575
 576         READ_BUF(32);
 577         READ32(lockt->lt_type);
 578         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 579                 goto xdr_error;
 580         READ64(lockt->lt_offset);
 581         READ64(lockt->lt_length);
 582         COPYMEM(&lockt->lt_clientid, 8);
 583         READ32(lockt->lt_owner.len);
 584         READ_BUF(lockt->lt_owner.len);
 585         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 586
 587         DECODE_TAIL;
 588 }
 589
 590 static __be32
 591 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 592 {
 593         DECODE_HEAD;
 594
 595         locku->lu_stateowner = NULL;
 596         READ_BUF(8);
 597         READ32(locku->lu_type);
 598         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 599                 goto xdr_error;
 600         READ32(locku->lu_seqid);
 601         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 602         if (status)
 603                 return status;
 604         READ_BUF(16);
 605         READ64(locku->lu_offset);
 606         READ64(locku->lu_length);
 607
 608         DECODE_TAIL;
 609 }
 610
 611 static __be32
 612 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 613 {
 614         DECODE_HEAD;
 615
 616         READ_BUF(4);
 617         READ32(lookup->lo_len);
 618         READ_BUF(lookup->lo_len);
 619         SAVEMEM(lookup->lo_name, lookup->lo_len);
 620         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 621                 return status;
 622
 623         DECODE_TAIL;
 624 }
 625
 626 static __be32
 627 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 628 {
 629         DECODE_HEAD;
 630
 631         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 632         open->op_iattr.ia_valid = 0;
 633         open->op_stateowner = NULL;
 634
 635         /* seqid, share_access, share_deny, clientid, ownerlen */
 636         READ_BUF(16 + sizeof(clientid_t));
 637         READ32(open->op_seqid);
 638         READ32(open->op_share_access);
 639         READ32(open->op_share_deny);
 640         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 641         READ32(open->op_owner.len);
 642
 643         /* owner, open_flag */
 644         READ_BUF(open->op_owner.len + 4);
 645         SAVEMEM(open->op_owner.data, open->op_owner.len);
 646         READ32(open->op_create);
 647         switch (open->op_create) {
 648         case NFS4_OPEN_NOCREATE:
 649                 break;
 650         case NFS4_OPEN_CREATE:
 651                 READ_BUF(4);
 652                 READ32(open->op_createmode);
 653                 switch (open->op_createmode) {
 654                 case NFS4_CREATE_UNCHECKED:
 655                 case NFS4_CREATE_GUARDED:
 656                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 657                                 goto out;
 658                         break;
 659                 case NFS4_CREATE_EXCLUSIVE:
 660                         READ_BUF(8);
 661                         COPYMEM(open->op_verf.data, 8);
 662                         break;
 663                 default:
 664                         goto xdr_error;
 665                 }
 666                 break;
 667         default:
 668                 goto xdr_error;
 669         }
 670
 671         /* open_claim */
 672         READ_BUF(4);
 673         READ32(open->op_claim_type);
 674         switch (open->op_claim_type) {
 675         case NFS4_OPEN_CLAIM_NULL:
 676         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 677                 READ_BUF(4);
 678                 READ32(open->op_fname.len);
 679                 READ_BUF(open->op_fname.len);
 680                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 681                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 682                         return status;
 683                 break;
 684         case NFS4_OPEN_CLAIM_PREVIOUS:
 685                 READ_BUF(4);
 686                 READ32(open->op_delegate_type);
 687                 break;
 688         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 689                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 690                 if (status)
 691                         return status;
 692                 READ_BUF(4);
 693                 READ32(open->op_fname.len);
 694                 READ_BUF(open->op_fname.len);
 695                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 696                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 697                         return status;
 698                 break;
 699         default:
 700                 goto xdr_error;
 701         }
 702
 703         DECODE_TAIL;
 704 }
 705
 706 static __be32
 707 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 708 {
 709         DECODE_HEAD;
 710
 711         open_conf->oc_stateowner = NULL;
 712         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 713         if (status)
 714                 return status;
 715         READ_BUF(4);
 716         READ32(open_conf->oc_seqid);
 717
 718         DECODE_TAIL;
 719 }
 720
 721 static __be32
 722 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 723 {
 724         DECODE_HEAD;
 725
 726         open_down->od_stateowner = NULL;
 727         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 728         if (status)
 729                 return status;
 730         READ_BUF(12);
 731         READ32(open_down->od_seqid);
 732         READ32(open_down->od_share_access);
 733         READ32(open_down->od_share_deny);
 734
 735         DECODE_TAIL;
 736 }
 737
 738 static __be32
 739 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 740 {
 741         DECODE_HEAD;
 742
 743         READ_BUF(4);
 744         READ32(putfh->pf_fhlen);
 745         if (putfh->pf_fhlen > NFS4_FHSIZE)
 746                 goto xdr_error;
 747         READ_BUF(putfh->pf_fhlen);
 748         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 749
 750         DECODE_TAIL;
 751 }
 752
 753 static __be32
 754 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 755 {
 756         DECODE_HEAD;
 757
 758         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 759         if (status)
 760                 return status;
 761         READ_BUF(12);
 762         READ64(read->rd_offset);
 763         READ32(read->rd_length);
 764
 765         DECODE_TAIL;
 766 }
 767
 768 static __be32
 769 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 770 {
 771         DECODE_HEAD;
 772
 773         READ_BUF(24);
 774         READ64(readdir->rd_cookie);
 775         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 776         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 777         READ32(readdir->rd_maxcount);
 778         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 779                 goto out;
 780
 781         DECODE_TAIL;
 782 }
 783
 784 static __be32
 785 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 786 {
 787         DECODE_HEAD;
 788
 789         READ_BUF(4);
 790         READ32(remove->rm_namelen);
 791         READ_BUF(remove->rm_namelen);
 792         SAVEMEM(remove->rm_name, remove->rm_namelen);
 793         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 794                 return status;
 795
 796         DECODE_TAIL;
 797 }
 798
 799 static __be32
 800 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 801 {
 802         DECODE_HEAD;
 803
 804         READ_BUF(4);
 805         READ32(rename->rn_snamelen);
 806         READ_BUF(rename->rn_snamelen + 4);
 807         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 808         READ32(rename->rn_tnamelen);
 809         READ_BUF(rename->rn_tnamelen);
 810         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 811         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 812                 return status;
 813         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 814                 return status;
 815
 816         DECODE_TAIL;
 817 }
 818
 819 static __be32
 820 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 821 {
 822         DECODE_HEAD;
 823
 824         READ_BUF(sizeof(clientid_t));
 825         COPYMEM(clientid, sizeof(clientid_t));
 826
 827         DECODE_TAIL;
 828 }
 829
 830 static __be32
 831 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 832                      struct nfsd4_secinfo *secinfo)
 833 {
 834         DECODE_HEAD;
 835
 836         READ_BUF(4);
 837         READ32(secinfo->si_namelen);
 838         READ_BUF(secinfo->si_namelen);
 839         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 840         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 841                                                                 nfserr_noent);
 842         if (status)
 843                 return status;
 844         DECODE_TAIL;
 845 }
 846
 847 static __be32
 848 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 849 {
 850         __be32 status;
 851
 852         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 853         if (status)
 854                 return status;
 855         return nfsd4_decode_fattr(argp, setattr->sa_bmval,
 856                                   &setattr->sa_iattr, &setattr->sa_acl);
 857 }
 858
 859 static __be32
 860 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 861 {
 862         DECODE_HEAD;
 863
 864         READ_BUF(12);
 865         COPYMEM(setclientid->se_verf.data, 8);
 866         READ32(setclientid->se_namelen);
 867
 868         READ_BUF(setclientid->se_namelen + 8);
 869         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 870         READ32(setclientid->se_callback_prog);
 871         READ32(setclientid->se_callback_netid_len);
 872
 873         READ_BUF(setclientid->se_callback_netid_len + 4);
 874         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 875         READ32(setclientid->se_callback_addr_len);
 876
 877         READ_BUF(setclientid->se_callback_addr_len + 4);
 878         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 879         READ32(setclientid->se_callback_ident);
 880
 881         DECODE_TAIL;
 882 }
 883
 884 static __be32
 885 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 886 {
 887         DECODE_HEAD;
 888
 889         READ_BUF(8 + sizeof(nfs4_verifier));
 890         COPYMEM(&scd_c->sc_clientid, 8);
 891         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 892
 893         DECODE_TAIL;
 894 }
 895
 896 /* Also used for NVERIFY */
 897 static __be32
 898 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 899 {
 900 #if 0
 901         struct nfsd4_compoundargs save = {
 902                 .p = argp->p,
 903                 .end = argp->end,
 904                 .rqstp = argp->rqstp,
 905         };
 906         u32             ve_bmval[2];
 907         struct iattr    ve_iattr;           /* request */
 908         struct nfs4_acl *ve_acl;            /* request */
 909 #endif
 910         DECODE_HEAD;
 911
 912         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 913                 goto out;
 914
 915         /* For convenience's sake, we compare raw xdr'd attributes in
 916          * nfsd4_proc_verify; however we still decode here just to return
 917          * correct error in case of bad xdr. */
 918 #if 0
 919         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 920         if (status == nfserr_inval) {
 921                 status = nfserrno(status);
 922                 goto out;
 923         }
 924 #endif
 925         READ_BUF(4);
 926         READ32(verify->ve_attrlen);
 927         READ_BUF(verify->ve_attrlen);
 928         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 929
 930         DECODE_TAIL;
 931 }
 932
 933 static __be32
 934 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 935 {
 936         int avail;
 937         int v;
 938         int len;
 939         DECODE_HEAD;
 940
 941         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
 942         if (status)
 943                 return status;
 944         READ_BUF(16);
 945         READ64(write->wr_offset);
 946         READ32(write->wr_stable_how);
 947         if (write->wr_stable_how > 2)
 948                 goto xdr_error;
 949         READ32(write->wr_buflen);
 950
 951         /* Sorry .. no magic macros for this.. *
 952          * READ_BUF(write->wr_buflen);
 953          * SAVEMEM(write->wr_buf, write->wr_buflen);
 954          */
 955         avail = (char*)argp->end - (char*)argp->p;
 956         if (avail + argp->pagelen < write->wr_buflen) {
 957                 dprintk("NFSD: xdr error (%s:%d)\n",
 958                                 __FILE__, __LINE__);
 959                 goto xdr_error;
 960         }
 961         argp->rqstp->rq_vec[0].iov_base = p;
 962         argp->rqstp->rq_vec[0].iov_len = avail;
 963         v = 0;
 964         len = write->wr_buflen;
 965         while (len > argp->rqstp->rq_vec[v].iov_len) {
 966                 len -= argp->rqstp->rq_vec[v].iov_len;
 967                 v++;
 968                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 969                 argp->pagelist++;
 970                 if (argp->pagelen >= PAGE_SIZE) {
 971                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 972                         argp->pagelen -= PAGE_SIZE;
 973                 } else {
 974                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 975                         argp->pagelen -= len;
 976                 }
 977         }
 978         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 979         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 980         argp->rqstp->rq_vec[v].iov_len = len;
 981         write->wr_vlen = v+1;
 982
 983         DECODE_TAIL;
 984 }
 985
 986 static __be32
 987 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 988 {
 989         DECODE_HEAD;
 990
 991         READ_BUF(12);
 992         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 993         READ32(rlockowner->rl_owner.len);
 994         READ_BUF(rlockowner->rl_owner.len);
 995         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 996
 997         DECODE_TAIL;
 998 }
 999
1000 static __be32
1001 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1002                          struct nfsd4_exchange_id *exid)
1003 {
1004         int dummy;
1005         DECODE_HEAD;
1006
1007         READ_BUF(NFS4_VERIFIER_SIZE);
1008         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1009
1010         READ_BUF(4);
1011         READ32(exid->clname.len);
1012
1013         READ_BUF(exid->clname.len);
1014         SAVEMEM(exid->clname.data, exid->clname.len);
1015
1016         READ_BUF(4);
1017         READ32(exid->flags);
1018
1019         /* Ignore state_protect4_a */
1020         READ_BUF(4);
1021         READ32(exid->spa_how);
1022         switch (exid->spa_how) {
1023         case SP4_NONE:
1024                 break;
1025         case SP4_MACH_CRED:
1026                 /* spo_must_enforce */
1027                 READ_BUF(4);
1028                 READ32(dummy);
1029                 READ_BUF(dummy * 4);
1030                 p += dummy;
1031
1032                 /* spo_must_allow */
1033                 READ_BUF(4);
1034                 READ32(dummy);
1035                 READ_BUF(dummy * 4);
1036                 p += dummy;
1037                 break;
1038         case SP4_SSV:
1039                 /* ssp_ops */
1040                 READ_BUF(4);
1041                 READ32(dummy);
1042                 READ_BUF(dummy * 4);
1043                 p += dummy;
1044
1045                 READ_BUF(4);
1046                 READ32(dummy);
1047                 READ_BUF(dummy * 4);
1048                 p += dummy;
1049
1050                 /* ssp_hash_algs<> */
1051                 READ_BUF(4);
1052                 READ32(dummy);
1053                 READ_BUF(dummy);
1054                 p += XDR_QUADLEN(dummy);
1055
1056                 /* ssp_encr_algs<> */
1057                 READ_BUF(4);
1058                 READ32(dummy);
1059                 READ_BUF(dummy);
1060                 p += XDR_QUADLEN(dummy);
1061
1062                 /* ssp_window and ssp_num_gss_handles */
1063                 READ_BUF(8);
1064                 READ32(dummy);
1065                 READ32(dummy);
1066                 break;
1067         default:
1068                 goto xdr_error;
1069         }
1070
1071         /* Ignore Implementation ID */
1072         READ_BUF(4);    /* nfs_impl_id4 array length */
1073         READ32(dummy);
1074
1075         if (dummy > 1)
1076                 goto xdr_error;
1077
1078         if (dummy == 1) {
1079                 /* nii_domain */
1080                 READ_BUF(4);
1081                 READ32(dummy);
1082                 READ_BUF(dummy);
1083                 p += XDR_QUADLEN(dummy);
1084
1085                 /* nii_name */
1086                 READ_BUF(4);
1087                 READ32(dummy);
1088                 READ_BUF(dummy);
1089                 p += XDR_QUADLEN(dummy);
1090
1091                 /* nii_date */
1092                 READ_BUF(12);
1093                 p += 3;
1094         }
1095         DECODE_TAIL;
1096 }
1097
1098 static __be32
1099 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1100                             struct nfsd4_create_session *sess)
1101 {
1102         DECODE_HEAD;
1103
1104         u32 dummy;
1105         char *machine_name;
1106         int i;
1107         int nr_secflavs;
1108
1109         READ_BUF(16);
1110         COPYMEM(&sess->clientid, 8);
1111         READ32(sess->seqid);
1112         READ32(sess->flags);
1113
1114         /* Fore channel attrs */
1115         READ_BUF(28);
1116         READ32(dummy); /* headerpadsz is always 0 */
1117         READ32(sess->fore_channel.maxreq_sz);
1118         READ32(sess->fore_channel.maxresp_sz);
1119         READ32(sess->fore_channel.maxresp_cached);
1120         READ32(sess->fore_channel.maxops);
1121         READ32(sess->fore_channel.maxreqs);
1122         READ32(sess->fore_channel.nr_rdma_attrs);
1123         if (sess->fore_channel.nr_rdma_attrs == 1) {
1124                 READ_BUF(4);
1125                 READ32(sess->fore_channel.rdma_attrs);
1126         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1127                 dprintk("Too many fore channel attr bitmaps!\n");
1128                 goto xdr_error;
1129         }
1130
1131         /* Back channel attrs */
1132         READ_BUF(28);
1133         READ32(dummy); /* headerpadsz is always 0 */
1134         READ32(sess->back_channel.maxreq_sz);
1135         READ32(sess->back_channel.maxresp_sz);
1136         READ32(sess->back_channel.maxresp_cached);
1137         READ32(sess->back_channel.maxops);
1138         READ32(sess->back_channel.maxreqs);
1139         READ32(sess->back_channel.nr_rdma_attrs);
1140         if (sess->back_channel.nr_rdma_attrs == 1) {
1141                 READ_BUF(4);
1142                 READ32(sess->back_channel.rdma_attrs);
1143         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1144                 dprintk("Too many back channel attr bitmaps!\n");
1145                 goto xdr_error;
1146         }
1147
1148         READ_BUF(8);
1149         READ32(sess->callback_prog);
1150
1151         /* callback_sec_params4 */
1152         READ32(nr_secflavs);
1153         for (i = 0; i < nr_secflavs; ++i) {
1154                 READ_BUF(4);
1155                 READ32(dummy);
1156                 switch (dummy) {
1157                 case RPC_AUTH_NULL:
1158                         /* Nothing to read */
1159                         break;
1160                 case RPC_AUTH_UNIX:
1161                         READ_BUF(8);
1162                         /* stamp */
1163                         READ32(dummy);
1164
1165                         /* machine name */
1166                         READ32(dummy);
1167                         READ_BUF(dummy);
1168                         SAVEMEM(machine_name, dummy);
1169
1170                         /* uid, gid */
1171                         READ_BUF(8);
1172                         READ32(sess->uid);
1173                         READ32(sess->gid);
1174
1175                         /* more gids */
1176                         READ_BUF(4);
1177                         READ32(dummy);
1178                         READ_BUF(dummy * 4);
1179                         for (i = 0; i < dummy; ++i)
1180                                 READ32(dummy);
1181                         break;
1182                 case RPC_AUTH_GSS:
1183                         dprintk("RPC_AUTH_GSS callback secflavor "
1184                                 "not supported!\n");
1185                         READ_BUF(8);
1186                         /* gcbp_service */
1187                         READ32(dummy);
1188                         /* gcbp_handle_from_server */
1189                         READ32(dummy);
1190                         READ_BUF(dummy);
1191                         p += XDR_QUADLEN(dummy);
1192                         /* gcbp_handle_from_client */
1193                         READ_BUF(4);
1194                         READ32(dummy);
1195                         READ_BUF(dummy);
1196                         p += XDR_QUADLEN(dummy);
1197                         break;
1198                 default:
1199                         dprintk("Illegal callback secflavor\n");
1200                         return nfserr_inval;
1201                 }
1202         }
1203         DECODE_TAIL;
1204 }
1205
1206 static __be32
1207 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1208                              struct nfsd4_destroy_session *destroy_session)
1209 {
1210         DECODE_HEAD;
1211         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1212         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1213
1214         DECODE_TAIL;
1215 }
1216
1217 static __be32
1218 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1219                       struct nfsd4_sequence *seq)
1220 {
1221         DECODE_HEAD;
1222
1223         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1224         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1225         READ32(seq->seqid);
1226         READ32(seq->slotid);
1227         READ32(seq->maxslots);
1228         READ32(seq->cachethis);
1229
1230         DECODE_TAIL;
1231 }
1232
1233 static __be32
1234 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1235 {
1236         return nfs_ok;
1237 }
1238
1239 static __be32
1240 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1241 {
1242         return nfserr_notsupp;
1243 }
1244
1245 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1246
1247 static nfsd4_dec nfsd4_dec_ops[] = {
1248         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1249         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1250         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1251         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1252         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1253         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1254         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1255         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1256         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1257         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1258         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1259         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1260         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1261         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1262         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1263         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1264         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1265         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1266         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1267         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1268         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1269         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1270         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1271         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1272         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1273         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1274         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1275         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1276         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1277         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1278         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1279         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1280         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1281         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1282         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1283         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1284         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1285 };
1286
1287 static nfsd4_dec nfsd41_dec_ops[] = {
1288         [OP_ACCESS]             (nfsd4_dec)nfsd4_decode_access,
1289         [OP_CLOSE]              (nfsd4_dec)nfsd4_decode_close,
1290         [OP_COMMIT]             (nfsd4_dec)nfsd4_decode_commit,
1291         [OP_CREATE]             (nfsd4_dec)nfsd4_decode_create,
1292         [OP_DELEGPURGE]         (nfsd4_dec)nfsd4_decode_notsupp,
1293         [OP_DELEGRETURN]        (nfsd4_dec)nfsd4_decode_delegreturn,
1294         [OP_GETATTR]            (nfsd4_dec)nfsd4_decode_getattr,
1295         [OP_GETFH]              (nfsd4_dec)nfsd4_decode_noop,
1296         [OP_LINK]               (nfsd4_dec)nfsd4_decode_link,
1297         [OP_LOCK]               (nfsd4_dec)nfsd4_decode_lock,
1298         [OP_LOCKT]              (nfsd4_dec)nfsd4_decode_lockt,
1299         [OP_LOCKU]              (nfsd4_dec)nfsd4_decode_locku,
1300         [OP_LOOKUP]             (nfsd4_dec)nfsd4_decode_lookup,
1301         [OP_LOOKUPP]            (nfsd4_dec)nfsd4_decode_noop,
1302         [OP_NVERIFY]            (nfsd4_dec)nfsd4_decode_verify,
1303         [OP_OPEN]               (nfsd4_dec)nfsd4_decode_open,
1304         [OP_OPENATTR]           (nfsd4_dec)nfsd4_decode_notsupp,
1305         [OP_OPEN_CONFIRM]       (nfsd4_dec)nfsd4_decode_notsupp,
1306         [OP_OPEN_DOWNGRADE]     (nfsd4_dec)nfsd4_decode_open_downgrade,
1307         [OP_PUTFH]              (nfsd4_dec)nfsd4_decode_putfh,
1308         [OP_PUTPUBFH]           (nfsd4_dec)nfsd4_decode_notsupp,
1309         [OP_PUTROOTFH]          (nfsd4_dec)nfsd4_decode_noop,
1310         [OP_READ]               (nfsd4_dec)nfsd4_decode_read,
1311         [OP_READDIR]            (nfsd4_dec)nfsd4_decode_readdir,
1312         [OP_READLINK]           (nfsd4_dec)nfsd4_decode_noop,
1313         [OP_REMOVE]             (nfsd4_dec)nfsd4_decode_remove,
1314         [OP_RENAME]             (nfsd4_dec)nfsd4_decode_rename,
1315         [OP_RENEW]              (nfsd4_dec)nfsd4_decode_notsupp,
1316         [OP_RESTOREFH]          (nfsd4_dec)nfsd4_decode_noop,
1317         [OP_SAVEFH]             (nfsd4_dec)nfsd4_decode_noop,
1318         [OP_SECINFO]            (nfsd4_dec)nfsd4_decode_secinfo,
1319         [OP_SETATTR]            (nfsd4_dec)nfsd4_decode_setattr,
1320         [OP_SETCLIENTID]        (nfsd4_dec)nfsd4_decode_notsupp,
1321         [OP_SETCLIENTID_CONFIRM](nfsd4_dec)nfsd4_decode_notsupp,
1322         [OP_VERIFY]             (nfsd4_dec)nfsd4_decode_verify,
1323         [OP_WRITE]              (nfsd4_dec)nfsd4_decode_write,
1324         [OP_RELEASE_LOCKOWNER]  (nfsd4_dec)nfsd4_decode_notsupp,
1325
1326         /* new operations for NFSv4.1 */
1327         [OP_BACKCHANNEL_CTL]    (nfsd4_dec)nfsd4_decode_notsupp,
1328         [OP_BIND_CONN_TO_SESSION](nfsd4_dec)nfsd4_decode_notsupp,
1329         [OP_EXCHANGE_ID]        (nfsd4_dec)nfsd4_decode_exchange_id,
1330         [OP_CREATE_SESSION]     (nfsd4_dec)nfsd4_decode_create_session,
1331         [OP_DESTROY_SESSION]    (nfsd4_dec)nfsd4_decode_destroy_session,
1332         [OP_FREE_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1333         [OP_GET_DIR_DELEGATION] (nfsd4_dec)nfsd4_decode_notsupp,
1334         [OP_GETDEVICEINFO]      (nfsd4_dec)nfsd4_decode_notsupp,
1335         [OP_GETDEVICELIST]      (nfsd4_dec)nfsd4_decode_notsupp,
1336         [OP_LAYOUTCOMMIT]       (nfsd4_dec)nfsd4_decode_notsupp,
1337         [OP_LAYOUTGET]          (nfsd4_dec)nfsd4_decode_notsupp,
1338         [OP_LAYOUTRETURN]       (nfsd4_dec)nfsd4_decode_notsupp,
1339         [OP_SECINFO_NO_NAME]    (nfsd4_dec)nfsd4_decode_notsupp,
1340         [OP_SEQUENCE]           (nfsd4_dec)nfsd4_decode_sequence,
1341         [OP_SET_SSV]            (nfsd4_dec)nfsd4_decode_notsupp,
1342         [OP_TEST_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1343         [OP_WANT_DELEGATION]    (nfsd4_dec)nfsd4_decode_notsupp,
1344         [OP_DESTROY_CLIENTID]   (nfsd4_dec)nfsd4_decode_notsupp,
1345         [OP_RECLAIM_COMPLETE]   (nfsd4_dec)nfsd4_decode_notsupp,
1346 };
1347
1348 struct nfsd4_minorversion_ops {
1349         nfsd4_dec *decoders;
1350         int nops;
1351 };
1352
1353 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1354         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1355         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1356 };
1357
1358 static __be32
1359 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1360 {
1361         DECODE_HEAD;
1362         struct nfsd4_op *op;
1363         struct nfsd4_minorversion_ops *ops;
1364         int i;
1365
1366         /*
1367          * XXX: According to spec, we should check the tag
1368          * for UTF-8 compliance.  I'm postponing this for
1369          * now because it seems that some clients do use
1370          * binary tags.
1371          */
1372         READ_BUF(4);
1373         READ32(argp->taglen);
1374         READ_BUF(argp->taglen + 8);
1375         SAVEMEM(argp->tag, argp->taglen);
1376         READ32(argp->minorversion);
1377         READ32(argp->opcnt);
1378
1379         if (argp->taglen > NFSD4_MAX_TAGLEN)
1380                 goto xdr_error;
1381         if (argp->opcnt > 100)
1382                 goto xdr_error;
1383
1384         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1385                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1386                 if (!argp->ops) {
1387                         argp->ops = argp->iops;
1388                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1389                         goto xdr_error;
1390                 }
1391         }
1392
1393         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1394                 argp->opcnt = 0;
1395
1396         ops = &nfsd4_minorversion[argp->minorversion];
1397         for (i = 0; i < argp->opcnt; i++) {
1398                 op = &argp->ops[i];
1399                 op->replay = NULL;
1400
1401                 /*
1402                  * We can't use READ_BUF() here because we need to handle
1403                  * a missing opcode as an OP_WRITE + 1. So we need to check
1404                  * to see if we're truly at the end of our buffer or if there
1405                  * is another page we need to flip to.
1406                  */
1407
1408                 if (argp->p == argp->end) {
1409                         if (argp->pagelen < 4) {
1410                                 /* There isn't an opcode still on the wire */
1411                                 op->opnum = OP_WRITE + 1;
1412                                 op->status = nfserr_bad_xdr;
1413                                 argp->opcnt = i+1;
1414                                 break;
1415                         }
1416
1417                         /*
1418                          * False alarm. We just hit a page boundary, but there
1419                          * is still data available.  Move pointer across page
1420                          * boundary.  *snip from READ_BUF*
1421                          */
1422                         argp->p = page_address(argp->pagelist[0]);
1423                         argp->pagelist++;
1424                         if (argp->pagelen < PAGE_SIZE) {
1425                                 argp->end = p + (argp->pagelen>>2);
1426                                 argp->pagelen = 0;
1427                         } else {
1428                                 argp->end = p + (PAGE_SIZE>>2);
1429                                 argp->pagelen -= PAGE_SIZE;
1430                         }
1431                 }
1432                 op->opnum = ntohl(*argp->p++);
1433
1434                 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1435                         op->status = ops->decoders[op->opnum](argp, &op->u);
1436                 else {
1437                         op->opnum = OP_ILLEGAL;
1438                         op->status = nfserr_op_illegal;
1439                 }
1440
1441                 if (op->status) {
1442                         argp->opcnt = i+1;
1443                         break;
1444                 }
1445         }
1446
1447         DECODE_TAIL;
1448 }
1449 /*
1450  * END OF "GENERIC" DECODE ROUTINES.
1451  */
1452
1453 /*
1454  * START OF "GENERIC" ENCODE ROUTINES.
1455  *   These may look a little ugly since they are imported from a "generic"
1456  * set of XDR encode/decode routines which are intended to be shared by
1457  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1458  *
1459  * If the pain of reading these is too great, it should be a straightforward
1460  * task to translate them into Linux-specific versions which are more
1461  * consistent with the style used in NFSv2/v3...
1462  */
1463 #define ENCODE_HEAD              __be32 *p
1464
1465 #define WRITE32(n)               *p++ = htonl(n)
1466 #define WRITE64(n)               do {                           \
1467         *p++ = htonl((u32)((n) >> 32));                         \
1468         *p++ = htonl((u32)(n));                                 \
1469 } while (0)
1470 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1471         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1472         memcpy(p, ptr, nbytes);                                 \
1473         p += XDR_QUADLEN(nbytes);                               \
1474 }} while (0)
1475 #define WRITECINFO(c)           do {                            \
1476         *p++ = htonl(c.atomic);                                 \
1477         *p++ = htonl(c.before_ctime_sec);                               \
1478         *p++ = htonl(c.before_ctime_nsec);                              \
1479         *p++ = htonl(c.after_ctime_sec);                                \
1480         *p++ = htonl(c.after_ctime_nsec);                               \
1481 } while (0)
1482
1483 #define RESERVE_SPACE(nbytes)   do {                            \
1484         p = resp->p;                                            \
1485         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1486 } while (0)
1487 #define ADJUST_ARGS()           resp->p = p
1488
1489 /*
1490  * Header routine to setup seqid operation replay cache
1491  */
1492 #define ENCODE_SEQID_OP_HEAD                                    \
1493         __be32 *save;                                           \
1494                                                                 \
1495         save = resp->p;
1496
1497 /*
1498  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1499  * is where sequence id's are incremented, and the replay cache is filled.
1500  * Note that we increment sequence id's here, at the last moment, so we're sure
1501  * we know whether the error to be returned is a sequence id mutating error.
1502  */
1503
1504 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1505         if (seqid_mutating_err(nfserr) && stateowner) {         \
1506                 stateowner->so_seqid++;                         \
1507                 stateowner->so_replay.rp_status = nfserr;       \
1508                 stateowner->so_replay.rp_buflen =               \
1509                           (((char *)(resp)->p - (char *)save)); \
1510                 memcpy(stateowner->so_replay.rp_buf, save,      \
1511                         stateowner->so_replay.rp_buflen);       \
1512         } } while (0);
1513
1514 /* Encode as an array of strings the string given with components
1515  * seperated @sep.
1516  */
1517 static __be32 nfsd4_encode_components(char sep, char *components,
1518                                    __be32 **pp, int *buflen)
1519 {
1520         __be32 *p = *pp;
1521         __be32 *countp = p;
1522         int strlen, count=0;
1523         char *str, *end;
1524
1525         dprintk("nfsd4_encode_components(%s)\n", components);
1526         if ((*buflen -= 4) < 0)
1527                 return nfserr_resource;
1528         WRITE32(0); /* We will fill this in with @count later */
1529         end = str = components;
1530         while (*end) {
1531                 for (; *end && (*end != sep); end++)
1532                         ; /* Point to end of component */
1533                 strlen = end - str;
1534                 if (strlen) {
1535                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1536                                 return nfserr_resource;
1537                         WRITE32(strlen);
1538                         WRITEMEM(str, strlen);
1539                         count++;
1540                 }
1541                 else
1542                         end++;
1543                 str = end;
1544         }
1545         *pp = p;
1546         p = countp;
1547         WRITE32(count);
1548         return 0;
1549 }
1550
1551 /*
1552  * encode a location element of a fs_locations structure
1553  */
1554 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1555                                     __be32 **pp, int *buflen)
1556 {
1557         __be32 status;
1558         __be32 *p = *pp;
1559
1560         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1561         if (status)
1562                 return status;
1563         status = nfsd4_encode_components('/', location->path, &p, buflen);
1564         if (status)
1565                 return status;
1566         *pp = p;
1567         return 0;
1568 }
1569
1570 /*
1571  * Return the path to an export point in the pseudo filesystem namespace
1572  * Returned string is safe to use as long as the caller holds a reference
1573  * to @exp.
1574  */
1575 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1576 {
1577         struct svc_fh tmp_fh;
1578         char *path, *rootpath;
1579
1580         fh_init(&tmp_fh, NFS4_FHSIZE);
1581         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1582         if (*stat)
1583                 return NULL;
1584         rootpath = tmp_fh.fh_export->ex_pathname;
1585
1586         path = exp->ex_pathname;
1587
1588         if (strncmp(path, rootpath, strlen(rootpath))) {
1589                 dprintk("nfsd: fs_locations failed;"
1590                         "%s is not contained in %s\n", path, rootpath);
1591                 *stat = nfserr_notsupp;
1592                 return NULL;
1593         }
1594
1595         return path + strlen(rootpath);
1596 }
1597
1598 /*
1599  *  encode a fs_locations structure
1600  */
1601 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1602                                      struct svc_export *exp,
1603                                      __be32 **pp, int *buflen)
1604 {
1605         __be32 status;
1606         int i;
1607         __be32 *p = *pp;
1608         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1609         char *root = nfsd4_path(rqstp, exp, &status);
1610
1611         if (status)
1612                 return status;
1613         status = nfsd4_encode_components('/', root, &p, buflen);
1614         if (status)
1615                 return status;
1616         if ((*buflen -= 4) < 0)
1617                 return nfserr_resource;
1618         WRITE32(fslocs->locations_count);
1619         for (i=0; i<fslocs->locations_count; i++) {
1620                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1621                                                    &p, buflen);
1622                 if (status)
1623                         return status;
1624         }
1625         *pp = p;
1626         return 0;
1627 }
1628
1629 static u32 nfs4_ftypes[16] = {
1630         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1631         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1632         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1633         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1634 };
1635
1636 static __be32
1637 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1638                         __be32 **p, int *buflen)
1639 {
1640         int status;
1641
1642         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1643                 return nfserr_resource;
1644         if (whotype != NFS4_ACL_WHO_NAMED)
1645                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1646         else if (group)
1647                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1648         else
1649                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1650         if (status < 0)
1651                 return nfserrno(status);
1652         *p = xdr_encode_opaque(*p, NULL, status);
1653         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1654         BUG_ON(*buflen < 0);
1655         return 0;
1656 }
1657
1658 static inline __be32
1659 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1660 {
1661         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1662 }
1663
1664 static inline __be32
1665 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1666 {
1667         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1668 }
1669
1670 static inline __be32
1671 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1672                 __be32 **p, int *buflen)
1673 {
1674         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1675 }
1676
1677 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1678                               FATTR4_WORD0_RDATTR_ERROR)
1679 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1680
1681 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1682 {
1683         /* As per referral draft:  */
1684         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1685             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1686                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1687                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1688                         *rdattr_err = NFSERR_MOVED;
1689                 else
1690                         return nfserr_moved;
1691         }
1692         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1693         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1694         return 0;
1695 }
1696
1697 /*
1698  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1699  * ourselves.
1700  *
1701  * @countp is the buffer size in _words_; upon successful return this becomes
1702  * replaced with the number of words written.
1703  */
1704 __be32
1705 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1706                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1707                 struct svc_rqst *rqstp, int ignore_crossmnt)
1708 {
1709         u32 bmval0 = bmval[0];
1710         u32 bmval1 = bmval[1];
1711         struct kstat stat;
1712         struct svc_fh tempfh;
1713         struct kstatfs statfs;
1714         int buflen = *countp << 2;
1715         __be32 *attrlenp;
1716         u32 dummy;
1717         u64 dummy64;
1718         u32 rdattr_err = 0;
1719         __be32 *p = buffer;
1720         __be32 status;
1721         int err;
1722         int aclsupport = 0;
1723         struct nfs4_acl *acl = NULL;
1724
1725         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1726         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1727         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1728
1729         if (exp->ex_fslocs.migrated) {
1730                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1731                 if (status)
1732                         goto out;
1733         }
1734
1735         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1736         if (err)
1737                 goto out_nfserr;
1738         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1739                         FATTR4_WORD0_MAXNAME)) ||
1740             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1741                        FATTR4_WORD1_SPACE_TOTAL))) {
1742                 err = vfs_statfs(dentry, &statfs);
1743                 if (err)
1744                         goto out_nfserr;
1745         }
1746         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1747                 fh_init(&tempfh, NFS4_FHSIZE);
1748                 status = fh_compose(&tempfh, exp, dentry, NULL);
1749                 if (status)
1750                         goto out;
1751                 fhp = &tempfh;
1752         }
1753         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1754                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1755                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1756                 aclsupport = (err == 0);
1757                 if (bmval0 & FATTR4_WORD0_ACL) {
1758                         if (err == -EOPNOTSUPP)
1759                                 bmval0 &= ~FATTR4_WORD0_ACL;
1760                         else if (err == -EINVAL) {
1761                                 status = nfserr_attrnotsupp;
1762                                 goto out;
1763                         } else if (err != 0)
1764                                 goto out_nfserr;
1765                 }
1766         }
1767         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1768                 if (exp->ex_fslocs.locations == NULL) {
1769                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1770                 }
1771         }
1772         if ((buflen -= 16) < 0)
1773                 goto out_resource;
1774
1775         WRITE32(2);
1776         WRITE32(bmval0);
1777         WRITE32(bmval1);
1778         attrlenp = p++;                /* to be backfilled later */
1779
1780         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1781                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1782                 if ((buflen -= 12) < 0)
1783                         goto out_resource;
1784                 if (!aclsupport)
1785                         word0 &= ~FATTR4_WORD0_ACL;
1786                 if (!exp->ex_fslocs.locations)
1787                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1788                 WRITE32(2);
1789                 WRITE32(word0);
1790                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1791         }
1792         if (bmval0 & FATTR4_WORD0_TYPE) {
1793                 if ((buflen -= 4) < 0)
1794                         goto out_resource;
1795                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1796                 if (dummy == NF4BAD)
1797                         goto out_serverfault;
1798                 WRITE32(dummy);
1799         }
1800         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1801                 if ((buflen -= 4) < 0)
1802                         goto out_resource;
1803                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1804                         WRITE32(NFS4_FH_PERSISTENT);
1805                 else
1806                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1807         }
1808         if (bmval0 & FATTR4_WORD0_CHANGE) {
1809                 /*
1810                  * Note: This _must_ be consistent with the scheme for writing
1811                  * change_info, so any changes made here must be reflected there
1812                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1813                  * macro above.)
1814                  */
1815                 if ((buflen -= 8) < 0)
1816                         goto out_resource;
1817                 WRITE32(stat.ctime.tv_sec);
1818                 WRITE32(stat.ctime.tv_nsec);
1819         }
1820         if (bmval0 & FATTR4_WORD0_SIZE) {
1821                 if ((buflen -= 8) < 0)
1822                         goto out_resource;
1823                 WRITE64(stat.size);
1824         }
1825         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1826                 if ((buflen -= 4) < 0)
1827                         goto out_resource;
1828                 WRITE32(1);
1829         }
1830         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1831                 if ((buflen -= 4) < 0)
1832                         goto out_resource;
1833                 WRITE32(1);
1834         }
1835         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1836                 if ((buflen -= 4) < 0)
1837                         goto out_resource;
1838                 WRITE32(0);
1839         }
1840         if (bmval0 & FATTR4_WORD0_FSID) {
1841                 if ((buflen -= 16) < 0)
1842                         goto out_resource;
1843                 if (exp->ex_fslocs.migrated) {
1844                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1845                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1846                 } else switch(fsid_source(fhp)) {
1847                 case FSIDSOURCE_FSID:
1848                         WRITE64((u64)exp->ex_fsid);
1849                         WRITE64((u64)0);
1850                         break;
1851                 case FSIDSOURCE_DEV:
1852                         WRITE32(0);
1853                         WRITE32(MAJOR(stat.dev));
1854                         WRITE32(0);
1855                         WRITE32(MINOR(stat.dev));
1856                         break;
1857                 case FSIDSOURCE_UUID:
1858                         WRITEMEM(exp->ex_uuid, 16);
1859                         break;
1860                 }
1861         }
1862         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1863                 if ((buflen -= 4) < 0)
1864                         goto out_resource;
1865                 WRITE32(0);
1866         }
1867         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1868                 if ((buflen -= 4) < 0)
1869                         goto out_resource;
1870                 WRITE32(NFSD_LEASE_TIME);
1871         }
1872         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1873                 if ((buflen -= 4) < 0)
1874                         goto out_resource;
1875                 WRITE32(rdattr_err);
1876         }
1877         if (bmval0 & FATTR4_WORD0_ACL) {
1878                 struct nfs4_ace *ace;
1879
1880                 if (acl == NULL) {
1881                         if ((buflen -= 4) < 0)
1882                                 goto out_resource;
1883
1884                         WRITE32(0);
1885                         goto out_acl;
1886                 }
1887                 if ((buflen -= 4) < 0)
1888                         goto out_resource;
1889                 WRITE32(acl->naces);
1890
1891                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1892                         if ((buflen -= 4*3) < 0)
1893                                 goto out_resource;
1894                         WRITE32(ace->type);
1895                         WRITE32(ace->flag);
1896                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1897                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1898                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1899                                 &p, &buflen);
1900                         if (status == nfserr_resource)
1901                                 goto out_resource;
1902                         if (status)
1903                                 goto out;
1904                 }
1905         }
1906 out_acl:
1907         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1908                 if ((buflen -= 4) < 0)
1909                         goto out_resource;
1910                 WRITE32(aclsupport ?
1911                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1912         }
1913         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1914                 if ((buflen -= 4) < 0)
1915                         goto out_resource;
1916                 WRITE32(1);
1917         }
1918         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1919                 if ((buflen -= 4) < 0)
1920                         goto out_resource;
1921                 WRITE32(1);
1922         }
1923         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1924                 if ((buflen -= 4) < 0)
1925                         goto out_resource;
1926                 WRITE32(1);
1927         }
1928         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1929                 if ((buflen -= 4) < 0)
1930                         goto out_resource;
1931                 WRITE32(1);
1932         }
1933         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1934                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1935                 if (buflen < 0)
1936                         goto out_resource;
1937                 WRITE32(fhp->fh_handle.fh_size);
1938                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1939         }
1940         if (bmval0 & FATTR4_WORD0_FILEID) {
1941                 if ((buflen -= 8) < 0)
1942                         goto out_resource;
1943                 WRITE64(stat.ino);
1944         }
1945         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1946                 if ((buflen -= 8) < 0)
1947                         goto out_resource;
1948                 WRITE64((u64) statfs.f_ffree);
1949         }
1950         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1951                 if ((buflen -= 8) < 0)
1952                         goto out_resource;
1953                 WRITE64((u64) statfs.f_ffree);
1954         }
1955         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1956                 if ((buflen -= 8) < 0)
1957                         goto out_resource;
1958                 WRITE64((u64) statfs.f_files);
1959         }
1960         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1961                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1962                 if (status == nfserr_resource)
1963                         goto out_resource;
1964                 if (status)
1965                         goto out;
1966         }
1967         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1968                 if ((buflen -= 4) < 0)
1969                         goto out_resource;
1970                 WRITE32(1);
1971         }
1972         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1973                 if ((buflen -= 8) < 0)
1974                         goto out_resource;
1975                 WRITE64(~(u64)0);
1976         }
1977         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1978                 if ((buflen -= 4) < 0)
1979                         goto out_resource;
1980                 WRITE32(255);
1981         }
1982         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1983                 if ((buflen -= 4) < 0)
1984                         goto out_resource;
1985                 WRITE32(statfs.f_namelen);
1986         }
1987         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1988                 if ((buflen -= 8) < 0)
1989                         goto out_resource;
1990                 WRITE64((u64) svc_max_payload(rqstp));
1991         }
1992         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1993                 if ((buflen -= 8) < 0)
1994                         goto out_resource;
1995                 WRITE64((u64) svc_max_payload(rqstp));
1996         }
1997         if (bmval1 & FATTR4_WORD1_MODE) {
1998                 if ((buflen -= 4) < 0)
1999                         goto out_resource;
2000                 WRITE32(stat.mode & S_IALLUGO);
2001         }
2002         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2003                 if ((buflen -= 4) < 0)
2004                         goto out_resource;
2005                 WRITE32(1);
2006         }
2007         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2008                 if ((buflen -= 4) < 0)
2009                         goto out_resource;
2010                 WRITE32(stat.nlink);
2011         }
2012         if (bmval1 & FATTR4_WORD1_OWNER) {
2013                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2014                 if (status == nfserr_resource)
2015                         goto out_resource;
2016                 if (status)
2017                         goto out;
2018         }
2019         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2020                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2021                 if (status == nfserr_resource)
2022                         goto out_resource;
2023                 if (status)
2024                         goto out;
2025         }
2026         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2027                 if ((buflen -= 8) < 0)
2028                         goto out_resource;
2029                 WRITE32((u32) MAJOR(stat.rdev));
2030                 WRITE32((u32) MINOR(stat.rdev));
2031         }
2032         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2033                 if ((buflen -= 8) < 0)
2034                         goto out_resource;
2035                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2036                 WRITE64(dummy64);
2037         }
2038         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2039                 if ((buflen -= 8) < 0)
2040                         goto out_resource;
2041                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2042                 WRITE64(dummy64);
2043         }
2044         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2045                 if ((buflen -= 8) < 0)
2046                         goto out_resource;
2047                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2048                 WRITE64(dummy64);
2049         }
2050         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2051                 if ((buflen -= 8) < 0)
2052                         goto out_resource;
2053                 dummy64 = (u64)stat.blocks << 9;
2054                 WRITE64(dummy64);
2055         }
2056         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2057                 if ((buflen -= 12) < 0)
2058                         goto out_resource;
2059                 WRITE32(0);
2060                 WRITE32(stat.atime.tv_sec);
2061                 WRITE32(stat.atime.tv_nsec);
2062         }
2063         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2064                 if ((buflen -= 12) < 0)
2065                         goto out_resource;
2066                 WRITE32(0);
2067                 WRITE32(1);
2068                 WRITE32(0);
2069         }
2070         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2071                 if ((buflen -= 12) < 0)
2072                         goto out_resource;
2073                 WRITE32(0);
2074                 WRITE32(stat.ctime.tv_sec);
2075                 WRITE32(stat.ctime.tv_nsec);
2076         }
2077         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2078                 if ((buflen -= 12) < 0)
2079                         goto out_resource;
2080                 WRITE32(0);
2081                 WRITE32(stat.mtime.tv_sec);
2082                 WRITE32(stat.mtime.tv_nsec);
2083         }
2084         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2085                 if ((buflen -= 8) < 0)
2086                         goto out_resource;
2087                 /*
2088                  * Get parent's attributes if not ignoring crossmount
2089                  * and this is the root of a cross-mounted filesystem.
2090                  */
2091                 if (ignore_crossmnt == 0 &&
2092                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
2093                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
2094                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
2095                         if (err)
2096                                 goto out_nfserr;
2097                 }
2098                 WRITE64(stat.ino);
2099         }
2100         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2101         *countp = p - buffer;
2102         status = nfs_ok;
2103
2104 out:
2105         kfree(acl);
2106         if (fhp == &tempfh)
2107                 fh_put(&tempfh);
2108         return status;
2109 out_nfserr:
2110         status = nfserrno(err);
2111         goto out;
2112 out_resource:
2113         *countp = 0;
2114         status = nfserr_resource;
2115         goto out;
2116 out_serverfault:
2117         status = nfserr_serverfault;
2118         goto out;
2119 }
2120
2121 static inline int attributes_need_mount(u32 *bmval)
2122 {
2123         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2124                 return 1;
2125         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2126                 return 1;
2127         return 0;
2128 }
2129
2130 static __be32
2131 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2132                 const char *name, int namlen, __be32 *p, int *buflen)
2133 {
2134         struct svc_export *exp = cd->rd_fhp->fh_export;
2135         struct dentry *dentry;
2136         __be32 nfserr;
2137         int ignore_crossmnt = 0;
2138
2139         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2140         if (IS_ERR(dentry))
2141                 return nfserrno(PTR_ERR(dentry));
2142
2143         exp_get(exp);
2144         /*
2145          * In the case of a mountpoint, the client may be asking for
2146          * attributes that are only properties of the underlying filesystem
2147          * as opposed to the cross-mounted file system. In such a case,
2148          * we will not follow the cross mount and will fill the attribtutes
2149          * directly from the mountpoint dentry.
2150          */
2151         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
2152                 ignore_crossmnt = 1;
2153         else if (d_mountpoint(dentry)) {
2154                 int err;
2155
2156                 /*
2157                  * Why the heck aren't we just using nfsd_lookup??
2158                  * Different "."/".." handling?  Something else?
2159                  * At least, add a comment here to explain....
2160                  */
2161                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2162                 if (err) {
2163                         nfserr = nfserrno(err);
2164                         goto out_put;
2165                 }
2166                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2167                 if (nfserr)
2168                         goto out_put;
2169
2170         }
2171         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2172                                         cd->rd_rqstp, ignore_crossmnt);
2173 out_put:
2174         dput(dentry);
2175         exp_put(exp);
2176         return nfserr;
2177 }
2178
2179 static __be32 *
2180 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2181 {
2182         __be32 *attrlenp;
2183
2184         if (buflen < 6)
2185                 return NULL;
2186         *p++ = htonl(2);
2187         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2188         *p++ = htonl(0);                         /* bmval1 */
2189
2190         attrlenp = p++;
2191         *p++ = nfserr;       /* no htonl */
2192         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2193         return p;
2194 }
2195
2196 static int
2197 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2198                     loff_t offset, u64 ino, unsigned int d_type)
2199 {
2200         struct readdir_cd *ccd = ccdv;
2201         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2202         int buflen;
2203         __be32 *p = cd->buffer;
2204         __be32 nfserr = nfserr_toosmall;
2205
2206         /* In nfsv4, "." and ".." never make it onto the wire.. */
2207         if (name && isdotent(name, namlen)) {
2208                 cd->common.err = nfs_ok;
2209                 return 0;
2210         }
2211
2212         if (cd->offset)
2213                 xdr_encode_hyper(cd->offset, (u64) offset);
2214
2215         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2216         if (buflen < 0)
2217                 goto fail;
2218
2219         *p++ = xdr_one;                             /* mark entry present */
2220         cd->offset = p;                             /* remember pointer */
2221         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2222         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2223
2224         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2225         switch (nfserr) {
2226         case nfs_ok:
2227                 p += buflen;
2228                 break;
2229         case nfserr_resource:
2230                 nfserr = nfserr_toosmall;
2231                 goto fail;
2232         case nfserr_dropit:
2233                 goto fail;
2234         default:
2235                 /*
2236                  * If the client requested the RDATTR_ERROR attribute,
2237                  * we stuff the error code into this attribute
2238                  * and continue.  If this attribute was not requested,
2239                  * then in accordance with the spec, we fail the
2240                  * entire READDIR operation(!)
2241                  */
2242                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2243                         goto fail;
2244                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2245                 if (p == NULL) {
2246                         nfserr = nfserr_toosmall;
2247                         goto fail;
2248                 }
2249         }
2250         cd->buflen -= (p - cd->buffer);
2251         cd->buffer = p;
2252         cd->common.err = nfs_ok;
2253         return 0;
2254 fail:
2255         cd->common.err = nfserr;
2256         return -EINVAL;
2257 }
2258
2259 static void
2260 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2261 {
2262         ENCODE_HEAD;
2263
2264         RESERVE_SPACE(sizeof(stateid_t));
2265         WRITE32(sid->si_generation);
2266         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2267         ADJUST_ARGS();
2268 }
2269
2270 static __be32
2271 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2272 {
2273         ENCODE_HEAD;
2274
2275         if (!nfserr) {
2276                 RESERVE_SPACE(8);
2277                 WRITE32(access->ac_supported);
2278                 WRITE32(access->ac_resp_access);
2279                 ADJUST_ARGS();
2280         }
2281         return nfserr;
2282 }
2283
2284 static __be32
2285 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2286 {
2287         ENCODE_SEQID_OP_HEAD;
2288
2289         if (!nfserr)
2290                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2291
2292         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2293         return nfserr;
2294 }
2295
2296
2297 static __be32
2298 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2299 {
2300         ENCODE_HEAD;
2301
2302         if (!nfserr) {
2303                 RESERVE_SPACE(8);
2304                 WRITEMEM(commit->co_verf.data, 8);
2305                 ADJUST_ARGS();
2306         }
2307         return nfserr;
2308 }
2309
2310 static __be32
2311 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2312 {
2313         ENCODE_HEAD;
2314
2315         if (!nfserr) {
2316                 RESERVE_SPACE(32);
2317                 WRITECINFO(create->cr_cinfo);
2318                 WRITE32(2);
2319                 WRITE32(create->cr_bmval[0]);
2320                 WRITE32(create->cr_bmval[1]);
2321                 ADJUST_ARGS();
2322         }
2323         return nfserr;
2324 }
2325
2326 static __be32
2327 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2328 {
2329         struct svc_fh *fhp = getattr->ga_fhp;
2330         int buflen;
2331
2332         if (nfserr)
2333                 return nfserr;
2334
2335         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2336         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2337                                     resp->p, &buflen, getattr->ga_bmval,
2338                                     resp->rqstp, 0);
2339         if (!nfserr)
2340                 resp->p += buflen;
2341         return nfserr;
2342 }
2343
2344 static __be32
2345 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2346 {
2347         struct svc_fh *fhp = *fhpp;
2348         unsigned int len;
2349         ENCODE_HEAD;
2350
2351         if (!nfserr) {
2352                 len = fhp->fh_handle.fh_size;
2353                 RESERVE_SPACE(len + 4);
2354                 WRITE32(len);
2355                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2356                 ADJUST_ARGS();
2357         }
2358         return nfserr;
2359 }
2360
2361 /*
2362 * Including all fields other than the name, a LOCK4denied structure requires
2363 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2364 */
2365 static void
2366 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2367 {
2368         ENCODE_HEAD;
2369
2370         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2371         WRITE64(ld->ld_start);
2372         WRITE64(ld->ld_length);
2373         WRITE32(ld->ld_type);
2374         if (ld->ld_sop) {
2375                 WRITEMEM(&ld->ld_clientid, 8);
2376                 WRITE32(ld->ld_sop->so_owner.len);
2377                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2378                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2379         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2380                 WRITE64((u64)0); /* clientid */
2381                 WRITE32(0); /* length of owner name */
2382         }
2383         ADJUST_ARGS();
2384 }
2385
2386 static __be32
2387 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2388 {
2389         ENCODE_SEQID_OP_HEAD;
2390
2391         if (!nfserr)
2392                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2393         else if (nfserr == nfserr_denied)
2394                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2395
2396         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2397         return nfserr;
2398 }
2399
2400 static __be32
2401 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2402 {
2403         if (nfserr == nfserr_denied)
2404                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2405         return nfserr;
2406 }
2407
2408 static __be32
2409 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2410 {
2411         ENCODE_SEQID_OP_HEAD;
2412
2413         if (!nfserr)
2414                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2415
2416         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2417         return nfserr;
2418 }
2419
2420
2421 static __be32
2422 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2423 {
2424         ENCODE_HEAD;
2425
2426         if (!nfserr) {
2427                 RESERVE_SPACE(20);
2428                 WRITECINFO(link->li_cinfo);
2429                 ADJUST_ARGS();
2430         }
2431         return nfserr;
2432 }
2433
2434
2435 static __be32
2436 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2437 {
2438         ENCODE_HEAD;
2439         ENCODE_SEQID_OP_HEAD;
2440
2441         if (nfserr)
2442                 goto out;
2443
2444         nfsd4_encode_stateid(resp, &open->op_stateid);
2445         RESERVE_SPACE(40);
2446         WRITECINFO(open->op_cinfo);
2447         WRITE32(open->op_rflags);
2448         WRITE32(2);
2449         WRITE32(open->op_bmval[0]);
2450         WRITE32(open->op_bmval[1]);
2451         WRITE32(open->op_delegate_type);
2452         ADJUST_ARGS();
2453
2454         switch (open->op_delegate_type) {
2455         case NFS4_OPEN_DELEGATE_NONE:
2456                 break;
2457         case NFS4_OPEN_DELEGATE_READ:
2458                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2459                 RESERVE_SPACE(20);
2460                 WRITE32(open->op_recall);
2461
2462                 /*
2463                  * TODO: ACE's in delegations
2464                  */
2465                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2466                 WRITE32(0);
2467                 WRITE32(0);
2468                 WRITE32(0);   /* XXX: is NULL principal ok? */
2469                 ADJUST_ARGS();
2470                 break;
2471         case NFS4_OPEN_DELEGATE_WRITE:
2472                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2473                 RESERVE_SPACE(32);
2474                 WRITE32(0);
2475
2476                 /*
2477                  * TODO: space_limit's in delegations
2478                  */
2479                 WRITE32(NFS4_LIMIT_SIZE);
2480                 WRITE32(~(u32)0);
2481                 WRITE32(~(u32)0);
2482
2483                 /*
2484                  * TODO: ACE's in delegations
2485                  */
2486                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2487                 WRITE32(0);
2488                 WRITE32(0);
2489                 WRITE32(0);   /* XXX: is NULL principal ok? */
2490                 ADJUST_ARGS();
2491                 break;
2492         default:
2493                 BUG();
2494         }
2495         /* XXX save filehandle here */
2496 out:
2497         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2498         return nfserr;
2499 }
2500
2501 static __be32
2502 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2503 {
2504         ENCODE_SEQID_OP_HEAD;
2505
2506         if (!nfserr)
2507                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2508
2509         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2510         return nfserr;
2511 }
2512
2513 static __be32
2514 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2515 {
2516         ENCODE_SEQID_OP_HEAD;
2517
2518         if (!nfserr)
2519                 nfsd4_encode_stateid(resp, &od->od_stateid);
2520
2521         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2522         return nfserr;
2523 }
2524
2525 static __be32
2526 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2527                   struct nfsd4_read *read)
2528 {
2529         u32 eof;
2530         int v, pn;
2531         unsigned long maxcount;
2532         long len;
2533         ENCODE_HEAD;
2534
2535         if (nfserr)
2536                 return nfserr;
2537         if (resp->xbuf->page_len)
2538                 return nfserr_resource;
2539
2540         RESERVE_SPACE(8); /* eof flag and byte count */
2541
2542         maxcount = svc_max_payload(resp->rqstp);
2543         if (maxcount > read->rd_length)
2544                 maxcount = read->rd_length;
2545
2546         len = maxcount;
2547         v = 0;
2548         while (len > 0) {
2549                 pn = resp->rqstp->rq_resused++;
2550                 resp->rqstp->rq_vec[v].iov_base =
2551                         page_address(resp->rqstp->rq_respages[pn]);
2552                 resp->rqstp->rq_vec[v].iov_len =
2553                         len < PAGE_SIZE ? len : PAGE_SIZE;
2554                 v++;
2555                 len -= PAGE_SIZE;
2556         }
2557         read->rd_vlen = v;
2558
2559         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2560                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2561                         &maxcount);
2562
2563         if (nfserr == nfserr_symlink)
2564                 nfserr = nfserr_inval;
2565         if (nfserr)
2566                 return nfserr;
2567         eof = (read->rd_offset + maxcount >=
2568                read->rd_fhp->fh_dentry->d_inode->i_size);
2569
2570         WRITE32(eof);
2571         WRITE32(maxcount);
2572         ADJUST_ARGS();
2573         resp->xbuf->head[0].iov_len = (char*)p
2574                                         - (char*)resp->xbuf->head[0].iov_base;
2575         resp->xbuf->page_len = maxcount;
2576
2577         /* Use rest of head for padding and remaining ops: */
2578         resp->xbuf->tail[0].iov_base = p;
2579         resp->xbuf->tail[0].iov_len = 0;
2580         if (maxcount&3) {
2581                 RESERVE_SPACE(4);
2582                 WRITE32(0);
2583                 resp->xbuf->tail[0].iov_base += maxcount&3;
2584                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2585                 ADJUST_ARGS();
2586         }
2587         return 0;
2588 }
2589
2590 static __be32
2591 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2592 {
2593         int maxcount;
2594         char *page;
2595         ENCODE_HEAD;
2596
2597         if (nfserr)
2598                 return nfserr;
2599         if (resp->xbuf->page_len)
2600                 return nfserr_resource;
2601
2602         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2603
2604         maxcount = PAGE_SIZE;
2605         RESERVE_SPACE(4);
2606
2607         /*
2608          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2609          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2610          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2611          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2612          */
2613         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2614         if (nfserr == nfserr_isdir)
2615                 return nfserr_inval;
2616         if (nfserr)
2617                 return nfserr;
2618
2619         WRITE32(maxcount);
2620         ADJUST_ARGS();
2621         resp->xbuf->head[0].iov_len = (char*)p
2622                                 - (char*)resp->xbuf->head[0].iov_base;
2623         resp->xbuf->page_len = maxcount;
2624
2625         /* Use rest of head for padding and remaining ops: */
2626         resp->xbuf->tail[0].iov_base = p;
2627         resp->xbuf->tail[0].iov_len = 0;
2628         if (maxcount&3) {
2629                 RESERVE_SPACE(4);
2630                 WRITE32(0);
2631                 resp->xbuf->tail[0].iov_base += maxcount&3;
2632                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2633                 ADJUST_ARGS();
2634         }
2635         return 0;
2636 }
2637
2638 static __be32
2639 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2640 {
2641         int maxcount;
2642         loff_t offset;
2643         __be32 *page, *savep, *tailbase;
2644         ENCODE_HEAD;
2645
2646         if (nfserr)
2647                 return nfserr;
2648         if (resp->xbuf->page_len)
2649                 return nfserr_resource;
2650
2651         RESERVE_SPACE(8);  /* verifier */
2652         savep = p;
2653
2654         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2655         WRITE32(0);
2656         WRITE32(0);
2657         ADJUST_ARGS();
2658         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2659         tailbase = p;
2660
2661         maxcount = PAGE_SIZE;
2662         if (maxcount > readdir->rd_maxcount)
2663                 maxcount = readdir->rd_maxcount;
2664
2665         /*
2666          * Convert from bytes to words, account for the two words already
2667          * written, make sure to leave two words at the end for the next
2668          * pointer and eof field.
2669          */
2670         maxcount = (maxcount >> 2) - 4;
2671         if (maxcount < 0) {
2672                 nfserr =  nfserr_toosmall;
2673                 goto err_no_verf;
2674         }
2675
2676         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2677         readdir->common.err = 0;
2678         readdir->buflen = maxcount;
2679         readdir->buffer = page;
2680         readdir->offset = NULL;
2681
2682         offset = readdir->rd_cookie;
2683         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2684                               &offset,
2685                               &readdir->common, nfsd4_encode_dirent);
2686         if (nfserr == nfs_ok &&
2687             readdir->common.err == nfserr_toosmall &&
2688             readdir->buffer == page)
2689                 nfserr = nfserr_toosmall;
2690         if (nfserr == nfserr_symlink)
2691                 nfserr = nfserr_notdir;
2692         if (nfserr)
2693                 goto err_no_verf;
2694
2695         if (readdir->offset)
2696                 xdr_encode_hyper(readdir->offset, offset);
2697
2698         p = readdir->buffer;
2699         *p++ = 0;       /* no more entries */
2700         *p++ = htonl(readdir->common.err == nfserr_eof);
2701         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2702                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2703
2704         /* Use rest of head for padding and remaining ops: */
2705         resp->xbuf->tail[0].iov_base = tailbase;
2706         resp->xbuf->tail[0].iov_len = 0;
2707         resp->p = resp->xbuf->tail[0].iov_base;
2708         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2709
2710         return 0;
2711 err_no_verf:
2712         p = savep;
2713         ADJUST_ARGS();
2714         return nfserr;
2715 }
2716
2717 static __be32
2718 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2719 {
2720         ENCODE_HEAD;
2721
2722         if (!nfserr) {
2723                 RESERVE_SPACE(20);
2724                 WRITECINFO(remove->rm_cinfo);
2725                 ADJUST_ARGS();
2726         }
2727         return nfserr;
2728 }
2729
2730 static __be32
2731 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2732 {
2733         ENCODE_HEAD;
2734
2735         if (!nfserr) {
2736                 RESERVE_SPACE(40);
2737                 WRITECINFO(rename->rn_sinfo);
2738                 WRITECINFO(rename->rn_tinfo);
2739                 ADJUST_ARGS();
2740         }
2741         return nfserr;
2742 }
2743
2744 static __be32
2745 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2746                      struct nfsd4_secinfo *secinfo)
2747 {
2748         int i = 0;
2749         struct svc_export *exp = secinfo->si_exp;
2750         u32 nflavs;
2751         struct exp_flavor_info *flavs;
2752         struct exp_flavor_info def_flavs[2];
2753         ENCODE_HEAD;
2754
2755         if (nfserr)
2756                 goto out;
2757         if (exp->ex_nflavors) {
2758                 flavs = exp->ex_flavors;
2759                 nflavs = exp->ex_nflavors;
2760         } else { /* Handling of some defaults in absence of real secinfo: */
2761                 flavs = def_flavs;
2762                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2763                         nflavs = 2;
2764                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2765                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2766                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2767                         nflavs = 1;
2768                         flavs[0].pseudoflavor
2769                                         = svcauth_gss_flavor(exp->ex_client);
2770                 } else {
2771                         nflavs = 1;
2772                         flavs[0].pseudoflavor
2773                                         = exp->ex_client->flavour->flavour;
2774                 }
2775         }
2776
2777         RESERVE_SPACE(4);
2778         WRITE32(nflavs);
2779         ADJUST_ARGS();
2780         for (i = 0; i < nflavs; i++) {
2781                 u32 flav = flavs[i].pseudoflavor;
2782                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2783
2784                 if (gm) {
2785                         RESERVE_SPACE(4);
2786                         WRITE32(RPC_AUTH_GSS);
2787                         ADJUST_ARGS();
2788                         RESERVE_SPACE(4 + gm->gm_oid.len);
2789                         WRITE32(gm->gm_oid.len);
2790                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2791                         ADJUST_ARGS();
2792                         RESERVE_SPACE(4);
2793                         WRITE32(0); /* qop */
2794                         ADJUST_ARGS();
2795                         RESERVE_SPACE(4);
2796                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2797                         ADJUST_ARGS();
2798                         gss_mech_put(gm);
2799                 } else {
2800                         RESERVE_SPACE(4);
2801                         WRITE32(flav);
2802                         ADJUST_ARGS();
2803                 }
2804         }
2805 out:
2806         if (exp)
2807                 exp_put(exp);
2808         return nfserr;
2809 }
2810
2811 /*
2812  * The SETATTR encode routine is special -- it always encodes a bitmap,
2813  * regardless of the error status.
2814  */
2815 static __be32
2816 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2817 {
2818         ENCODE_HEAD;
2819
2820         RESERVE_SPACE(12);
2821         if (nfserr) {
2822                 WRITE32(2);
2823                 WRITE32(0);
2824                 WRITE32(0);
2825         }
2826         else {
2827                 WRITE32(2);
2828                 WRITE32(setattr->sa_bmval[0]);
2829                 WRITE32(setattr->sa_bmval[1]);
2830         }
2831         ADJUST_ARGS();
2832         return nfserr;
2833 }
2834
2835 static __be32
2836 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2837 {
2838         ENCODE_HEAD;
2839
2840         if (!nfserr) {
2841                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2842                 WRITEMEM(&scd->se_clientid, 8);
2843                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2844                 ADJUST_ARGS();
2845         }
2846         else if (nfserr == nfserr_clid_inuse) {
2847                 RESERVE_SPACE(8);
2848                 WRITE32(0);
2849                 WRITE32(0);
2850                 ADJUST_ARGS();
2851         }
2852         return nfserr;
2853 }
2854
2855 static __be32
2856 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2857 {
2858         ENCODE_HEAD;
2859
2860         if (!nfserr) {
2861                 RESERVE_SPACE(16);
2862                 WRITE32(write->wr_bytes_written);
2863                 WRITE32(write->wr_how_written);
2864                 WRITEMEM(write->wr_verifier.data, 8);
2865                 ADJUST_ARGS();
2866         }
2867         return nfserr;
2868 }
2869
2870 static __be32
2871 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2872                          struct nfsd4_exchange_id *exid)
2873 {
2874         ENCODE_HEAD;
2875         char *major_id;
2876         char *server_scope;
2877         int major_id_sz;
2878         int server_scope_sz;
2879         uint64_t minor_id = 0;
2880
2881         if (nfserr)
2882                 return nfserr;
2883
2884         major_id = utsname()->nodename;
2885         major_id_sz = strlen(major_id);
2886         server_scope = utsname()->nodename;
2887         server_scope_sz = strlen(server_scope);
2888
2889         RESERVE_SPACE(
2890                 8 /* eir_clientid */ +
2891                 4 /* eir_sequenceid */ +
2892                 4 /* eir_flags */ +
2893                 4 /* spr_how (SP4_NONE) */ +
2894                 8 /* so_minor_id */ +
2895                 4 /* so_major_id.len */ +
2896                 (XDR_QUADLEN(major_id_sz) * 4) +
2897                 4 /* eir_server_scope.len */ +
2898                 (XDR_QUADLEN(server_scope_sz) * 4) +
2899                 4 /* eir_server_impl_id.count (0) */);
2900
2901         WRITEMEM(&exid->clientid, 8);
2902         WRITE32(exid->seqid);
2903         WRITE32(exid->flags);
2904
2905         /* state_protect4_r. Currently only support SP4_NONE */
2906         BUG_ON(exid->spa_how != SP4_NONE);
2907         WRITE32(exid->spa_how);
2908
2909         /* The server_owner struct */
2910         WRITE64(minor_id);      /* Minor id */
2911         /* major id */
2912         WRITE32(major_id_sz);
2913         WRITEMEM(major_id, major_id_sz);
2914
2915         /* Server scope */
2916         WRITE32(server_scope_sz);
2917         WRITEMEM(server_scope, server_scope_sz);
2918
2919         /* Implementation id */
2920         WRITE32(0);     /* zero length nfs_impl_id4 array */
2921         ADJUST_ARGS();
2922         return 0;
2923 }
2924
2925 static __be32
2926 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
2927                             struct nfsd4_create_session *sess)
2928 {
2929         ENCODE_HEAD;
2930
2931         if (nfserr)
2932                 return nfserr;
2933
2934         RESERVE_SPACE(24);
2935         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2936         WRITE32(sess->seqid);
2937         WRITE32(sess->flags);
2938         ADJUST_ARGS();
2939
2940         RESERVE_SPACE(28);
2941         WRITE32(0); /* headerpadsz */
2942         WRITE32(sess->fore_channel.maxreq_sz);
2943         WRITE32(sess->fore_channel.maxresp_sz);
2944         WRITE32(sess->fore_channel.maxresp_cached);
2945         WRITE32(sess->fore_channel.maxops);
2946         WRITE32(sess->fore_channel.maxreqs);
2947         WRITE32(sess->fore_channel.nr_rdma_attrs);
2948         ADJUST_ARGS();
2949
2950         if (sess->fore_channel.nr_rdma_attrs) {
2951                 RESERVE_SPACE(4);
2952                 WRITE32(sess->fore_channel.rdma_attrs);
2953                 ADJUST_ARGS();
2954         }
2955
2956         RESERVE_SPACE(28);
2957         WRITE32(0); /* headerpadsz */
2958         WRITE32(sess->back_channel.maxreq_sz);
2959         WRITE32(sess->back_channel.maxresp_sz);
2960         WRITE32(sess->back_channel.maxresp_cached);
2961         WRITE32(sess->back_channel.maxops);
2962         WRITE32(sess->back_channel.maxreqs);
2963         WRITE32(sess->back_channel.nr_rdma_attrs);
2964         ADJUST_ARGS();
2965
2966         if (sess->back_channel.nr_rdma_attrs) {
2967                 RESERVE_SPACE(4);
2968                 WRITE32(sess->back_channel.rdma_attrs);
2969                 ADJUST_ARGS();
2970         }
2971         return 0;
2972 }
2973
2974 static __be32
2975 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
2976                              struct nfsd4_destroy_session *destroy_session)
2977 {
2978         return nfserr;
2979 }
2980
2981 __be32
2982 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
2983                       struct nfsd4_sequence *seq)
2984 {
2985         ENCODE_HEAD;
2986
2987         if (nfserr)
2988                 return nfserr;
2989
2990         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
2991         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2992         WRITE32(seq->seqid);
2993         WRITE32(seq->slotid);
2994         WRITE32(seq->maxslots);
2995         /*
2996          * FIXME: for now:
2997          *   target_maxslots = maxslots
2998          *   status_flags = 0
2999          */
3000         WRITE32(seq->maxslots);
3001         WRITE32(0);
3002
3003         ADJUST_ARGS();
3004         return 0;
3005 }
3006
3007 static __be32
3008 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3009 {
3010         return nfserr;
3011 }
3012
3013 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3014
3015 /*
3016  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3017  * since we don't need to filter out obsolete ops as this is
3018  * done in the decoding phase.
3019  */
3020 static nfsd4_enc nfsd4_enc_ops[] = {
3021         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3022         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3023         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3024         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3025         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3026         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3027         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3028         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3029         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3030         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3031         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3032         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3033         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3034         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3035         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3036         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3037         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3038         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3039         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3040         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3041         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3042         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3043         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3044         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3045         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3046         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3047         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3048         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3049         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3050         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3051         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3052         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3053         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3054         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3055         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3056         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3057         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3058
3059         /* NFSv4.1 operations */
3060         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3061         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3062         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3063         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3064         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3065         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3066         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3067         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3068         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3069         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3070         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3071         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3072         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
3073         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3074         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3075         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3076         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3077         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3078         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3079 };
3080
3081 /*
3082  * Calculate the total amount of memory that the compound response has taken
3083  * after encoding the current operation.
3084  *
3085  * pad: add on 8 bytes for the next operation's op_code and status so that
3086  * there is room to cache a failure on the next operation.
3087  *
3088  * Compare this length to the session se_fmaxresp_cached.
3089  *
3090  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3091  * will be at least a page and will therefore hold the xdr_buf head.
3092  */
3093 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3094 {
3095         int status = 0;
3096         struct xdr_buf *xb = &resp->rqstp->rq_res;
3097         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3098         struct nfsd4_session *session = NULL;
3099         struct nfsd4_slot *slot = resp->cstate.slot;
3100         u32 length, tlen = 0, pad = 8;
3101
3102         if (!nfsd4_has_session(&resp->cstate))
3103                 return status;
3104
3105         session = resp->cstate.session;
3106         if (session == NULL || slot->sl_cache_entry.ce_cachethis == 0)
3107                 return status;
3108
3109         if (resp->opcnt >= args->opcnt)
3110                 pad = 0; /* this is the last operation */
3111
3112         if (xb->page_len == 0) {
3113                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3114         } else {
3115                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3116                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3117
3118                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3119         }
3120         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3121                 length, xb->page_len, tlen, pad);
3122
3123         if (length <= session->se_fmaxresp_cached)
3124                 return status;
3125         else
3126                 return nfserr_rep_too_big_to_cache;
3127 }
3128
3129 void
3130 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3131 {
3132         __be32 *statp;
3133         ENCODE_HEAD;
3134
3135         RESERVE_SPACE(8);
3136         WRITE32(op->opnum);
3137         statp = p++;    /* to be backfilled at the end */
3138         ADJUST_ARGS();
3139
3140         if (op->opnum == OP_ILLEGAL)
3141                 goto status;
3142         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3143                !nfsd4_enc_ops[op->opnum]);
3144         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3145         /* nfsd4_check_drc_limit guarantees enough room for error status */
3146         if (!op->status && nfsd4_check_drc_limit(resp))
3147                 op->status = nfserr_rep_too_big_to_cache;
3148 status:
3149         /*
3150          * Note: We write the status directly, instead of using WRITE32(),
3151          * since it is already in network byte order.
3152          */
3153         *statp = op->status;
3154 }
3155
3156 /*
3157  * Encode the reply stored in the stateowner reply cache
3158  *
3159  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3160  * previously sent already encoded operation.
3161  *
3162  * called with nfs4_lock_state() held
3163  */
3164 void
3165 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3166 {
3167         ENCODE_HEAD;
3168         struct nfs4_replay *rp = op->replay;
3169
3170         BUG_ON(!rp);
3171
3172         RESERVE_SPACE(8);
3173         WRITE32(op->opnum);
3174         *p++ = rp->rp_status;  /* already xdr'ed */
3175         ADJUST_ARGS();
3176
3177         RESERVE_SPACE(rp->rp_buflen);
3178         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3179         ADJUST_ARGS();
3180 }
3181
3182 /*
3183  * END OF "GENERIC" ENCODE ROUTINES.
3184  */
3185
3186 int
3187 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3188 {
3189         return xdr_ressize_check(rqstp, p);
3190 }
3191
3192 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3193 {
3194         if (args->ops != args->iops) {
3195                 kfree(args->ops);
3196                 args->ops = args->iops;
3197         }
3198         kfree(args->tmpp);
3199         args->tmpp = NULL;
3200         while (args->to_free) {
3201                 struct tmpbuf *tb = args->to_free;
3202                 args->to_free = tb->next;
3203                 tb->release(tb->buf);
3204                 kfree(tb);
3205         }
3206 }
3207
3208 int
3209 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3210 {
3211         __be32 status;
3212
3213         args->p = p;
3214         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3215         args->pagelist = rqstp->rq_arg.pages;
3216         args->pagelen = rqstp->rq_arg.page_len;
3217         args->tmpp = NULL;
3218         args->to_free = NULL;
3219         args->ops = args->iops;
3220         args->rqstp = rqstp;
3221
3222         status = nfsd4_decode_compound(args);
3223         if (status) {
3224                 nfsd4_release_compoundargs(args);
3225         }
3226         return !status;
3227 }
3228
3229 int
3230 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3231 {
3232         /*
3233          * All that remains is to write the tag and operation count...
3234          */
3235         struct kvec *iov;
3236         p = resp->tagp;
3237         *p++ = htonl(resp->taglen);
3238         memcpy(p, resp->tag, resp->taglen);
3239         p += XDR_QUADLEN(resp->taglen);
3240         *p++ = htonl(resp->opcnt);
3241
3242         if (rqstp->rq_res.page_len)
3243                 iov = &rqstp->rq_res.tail[0];
3244         else
3245                 iov = &rqstp->rq_res.head[0];
3246         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3247         BUG_ON(iov->iov_len > PAGE_SIZE);
3248         if (nfsd4_has_session(&resp->cstate)) {
3249                 if (resp->cstate.status == nfserr_replay_cache &&
3250                                 !nfsd4_not_cached(resp)) {
3251                         iov->iov_len = resp->cstate.iovlen;
3252                 } else {
3253                         nfsd4_store_cache_entry(resp);
3254                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3255                         resp->cstate.slot->sl_inuse = 0;
3256                 }
3257                 if (resp->cstate.session)
3258                         nfsd4_put_session(resp->cstate.session);
3259         }
3260         return 1;
3261 }
3262
3263 /*
3264  * Local variables:
3265  *  c-basic-offset: 8
3266  * End:
3267  */