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   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * TODO: Neil Brown made the following observation:  We currently
  36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37  * never release any of that until the request is complete.
  38  * It would be good to calculate a new maximum response size while
  39  * decoding the COMPOUND, and call svc_reserve with this number
  40  * at the end of nfs4svc_decode_compoundargs.
  41  */
  42
  43 #include <linux/param.h>
  44 #include <linux/smp.h>
  45 #include <linux/fs.h>
  46 #include <linux/namei.h>
  47 #include <linux/vfs.h>
  48 #include <linux/utsname.h>
  49 #include <linux/sunrpc/xdr.h>
  50 #include <linux/sunrpc/svc.h>
  51 #include <linux/sunrpc/clnt.h>
  52 #include <linux/nfsd/nfsd.h>
  53 #include <linux/nfsd/state.h>
  54 #include <linux/nfsd/xdr4.h>
  55 #include <linux/nfsd_idmap.h>
  56 #include <linux/nfs4.h>
  57 #include <linux/nfs4_acl.h>
  58 #include <linux/sunrpc/gss_api.h>
  59 #include <linux/sunrpc/svcauth_gss.h>
  60
  61 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  62
  63 /*
  64  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  65  * directory in order to indicate to the client that a filesystem boundary is present
  66  * We use a fixed fsid for a referral
  67  */
  68 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  69 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  70
  71 static __be32
  72 check_filename(char *str, int len, __be32 err)
  73 {
  74         int i;
  75
  76         if (len == 0)
  77                 return nfserr_inval;
  78         if (isdotent(str, len))
  79                 return err;
  80         for (i = 0; i < len; i++)
  81                 if (str[i] == '/')
  82                         return err;
  83         return 0;
  84 }
  85
  86 /*
  87  * START OF "GENERIC" DECODE ROUTINES.
  88  *   These may look a little ugly since they are imported from a "generic"
  89  * set of XDR encode/decode routines which are intended to be shared by
  90  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  91  *
  92  * If the pain of reading these is too great, it should be a straightforward
  93  * task to translate them into Linux-specific versions which are more
  94  * consistent with the style used in NFSv2/v3...
  95  */
  96 #define DECODE_HEAD                             \
  97         __be32 *p;                              \
  98         __be32 status
  99 #define DECODE_TAIL                             \
 100         status = 0;                             \
 101 out:                                            \
 102         return status;                          \
 103 xdr_error:                                      \
 104         dprintk("NFSD: xdr error (%s:%d)\n",    \
 105                         __FILE__, __LINE__);    \
 106         status = nfserr_bad_xdr;                \
 107         goto out
 108
 109 #define READ32(x)         (x) = ntohl(*p++)
 110 #define READ64(x)         do {                  \
 111         (x) = (u64)ntohl(*p++) << 32;           \
 112         (x) |= ntohl(*p++);                     \
 113 } while (0)
 114 #define READTIME(x)       do {                  \
 115         p++;                                    \
 116         (x) = ntohl(*p++);                      \
 117         p++;                                    \
 118 } while (0)
 119 #define READMEM(x,nbytes) do {                  \
 120         x = (char *)p;                          \
 121         p += XDR_QUADLEN(nbytes);               \
 122 } while (0)
 123 #define SAVEMEM(x,nbytes) do {                  \
 124         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 125                 savemem(argp, p, nbytes) :      \
 126                 (char *)p)) {                   \
 127                 dprintk("NFSD: xdr error (%s:%d)\n", \
 128                                 __FILE__, __LINE__); \
 129                 goto xdr_error;                 \
 130                 }                               \
 131         p += XDR_QUADLEN(nbytes);               \
 132 } while (0)
 133 #define COPYMEM(x,nbytes) do {                  \
 134         memcpy((x), p, nbytes);                 \
 135         p += XDR_QUADLEN(nbytes);               \
 136 } while (0)
 137
 138 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 139 #define READ_BUF(nbytes)  do {                  \
 140         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 141                 p = argp->p;                    \
 142                 argp->p += XDR_QUADLEN(nbytes); \
 143         } else if (!(p = read_buf(argp, nbytes))) { \
 144                 dprintk("NFSD: xdr error (%s:%d)\n", \
 145                                 __FILE__, __LINE__); \
 146                 goto xdr_error;                 \
 147         }                                       \
 148 } while (0)
 149
 150 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 151 {
 152         /* We want more bytes than seem to be available.
 153          * Maybe we need a new page, maybe we have just run out
 154          */
 155         unsigned int avail = (char *)argp->end - (char *)argp->p;
 156         __be32 *p;
 157         if (avail + argp->pagelen < nbytes)
 158                 return NULL;
 159         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 160                 return NULL;
 161         /* ok, we can do it with the current plus the next page */
 162         if (nbytes <= sizeof(argp->tmp))
 163                 p = argp->tmp;
 164         else {
 165                 kfree(argp->tmpp);
 166                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 167                 if (!p)
 168                         return NULL;
 169
 170         }
 171         /*
 172          * The following memcpy is safe because read_buf is always
 173          * called with nbytes > avail, and the two cases above both
 174          * guarantee p points to at least nbytes bytes.
 175          */
 176         memcpy(p, argp->p, avail);
 177         /* step to next page */
 178         argp->p = page_address(argp->pagelist[0]);
 179         argp->pagelist++;
 180         if (argp->pagelen < PAGE_SIZE) {
 181                 argp->end = p + (argp->pagelen>>2);
 182                 argp->pagelen = 0;
 183         } else {
 184                 argp->end = p + (PAGE_SIZE>>2);
 185                 argp->pagelen -= PAGE_SIZE;
 186         }
 187         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 188         argp->p += XDR_QUADLEN(nbytes - avail);
 189         return p;
 190 }
 191
 192 static int zero_clientid(clientid_t *clid)
 193 {
 194         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 195 }
 196
 197 static int
 198 defer_free(struct nfsd4_compoundargs *argp,
 199                 void (*release)(const void *), void *p)
 200 {
 201         struct tmpbuf *tb;
 202
 203         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 204         if (!tb)
 205                 return -ENOMEM;
 206         tb->buf = p;
 207         tb->release = release;
 208         tb->next = argp->to_free;
 209         argp->to_free = tb;
 210         return 0;
 211 }
 212
 213 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 214 {
 215         if (p == argp->tmp) {
 216                 p = kmalloc(nbytes, GFP_KERNEL);
 217                 if (!p)
 218                         return NULL;
 219                 memcpy(p, argp->tmp, nbytes);
 220         } else {
 221                 BUG_ON(p != argp->tmpp);
 222                 argp->tmpp = NULL;
 223         }
 224         if (defer_free(argp, kfree, p)) {
 225                 kfree(p);
 226                 return NULL;
 227         } else
 228                 return (char *)p;
 229 }
 230
 231 static __be32
 232 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 233 {
 234         u32 bmlen;
 235         DECODE_HEAD;
 236
 237         bmval[0] = 0;
 238         bmval[1] = 0;
 239
 240         READ_BUF(4);
 241         READ32(bmlen);
 242         if (bmlen > 1000)
 243                 goto xdr_error;
 244
 245         READ_BUF(bmlen << 2);
 246         if (bmlen > 0)
 247                 READ32(bmval[0]);
 248         if (bmlen > 1)
 249                 READ32(bmval[1]);
 250
 251         DECODE_TAIL;
 252 }
 253
 254 static __be32
 255 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 256     struct nfs4_acl **acl)
 257 {
 258         int expected_len, len = 0;
 259         u32 dummy32;
 260         char *buf;
 261         int host_err;
 262
 263         DECODE_HEAD;
 264         iattr->ia_valid = 0;
 265         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 266                 return status;
 267
 268         /*
 269          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
 270          * read-only attributes return ERR_INVAL.
 271          */
 272         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 273                 return nfserr_attrnotsupp;
 274         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 275                 return nfserr_inval;
 276
 277         READ_BUF(4);
 278         READ32(expected_len);
 279
 280         if (bmval[0] & FATTR4_WORD0_SIZE) {
 281                 READ_BUF(8);
 282                 len += 8;
 283                 READ64(iattr->ia_size);
 284                 iattr->ia_valid |= ATTR_SIZE;
 285         }
 286         if (bmval[0] & FATTR4_WORD0_ACL) {
 287                 int nace;
 288                 struct nfs4_ace *ace;
 289
 290                 READ_BUF(4); len += 4;
 291                 READ32(nace);
 292
 293                 if (nace > NFS4_ACL_MAX)
 294                         return nfserr_resource;
 295
 296                 *acl = nfs4_acl_new(nace);
 297                 if (*acl == NULL) {
 298                         host_err = -ENOMEM;
 299                         goto out_nfserr;
 300                 }
 301                 defer_free(argp, kfree, *acl);
 302
 303                 (*acl)->naces = nace;
 304                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 305                         READ_BUF(16); len += 16;
 306                         READ32(ace->type);
 307                         READ32(ace->flag);
 308                         READ32(ace->access_mask);
 309                         READ32(dummy32);
 310                         READ_BUF(dummy32);
 311                         len += XDR_QUADLEN(dummy32) << 2;
 312                         READMEM(buf, dummy32);
 313                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 314                         host_err = 0;
 315                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 316                                 ace->who = 0;
 317                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 318                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 319                                                 buf, dummy32, &ace->who);
 320                         else
 321                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 322                                                 buf, dummy32, &ace->who);
 323                         if (host_err)
 324                                 goto out_nfserr;
 325                 }
 326         } else
 327                 *acl = NULL;
 328         if (bmval[1] & FATTR4_WORD1_MODE) {
 329                 READ_BUF(4);
 330                 len += 4;
 331                 READ32(iattr->ia_mode);
 332                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 333                 iattr->ia_valid |= ATTR_MODE;
 334         }
 335         if (bmval[1] & FATTR4_WORD1_OWNER) {
 336                 READ_BUF(4);
 337                 len += 4;
 338                 READ32(dummy32);
 339                 READ_BUF(dummy32);
 340                 len += (XDR_QUADLEN(dummy32) << 2);
 341                 READMEM(buf, dummy32);
 342                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 343                         goto out_nfserr;
 344                 iattr->ia_valid |= ATTR_UID;
 345         }
 346         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 347                 READ_BUF(4);
 348                 len += 4;
 349                 READ32(dummy32);
 350                 READ_BUF(dummy32);
 351                 len += (XDR_QUADLEN(dummy32) << 2);
 352                 READMEM(buf, dummy32);
 353                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 354                         goto out_nfserr;
 355                 iattr->ia_valid |= ATTR_GID;
 356         }
 357         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 358                 READ_BUF(4);
 359                 len += 4;
 360                 READ32(dummy32);
 361                 switch (dummy32) {
 362                 case NFS4_SET_TO_CLIENT_TIME:
 363                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 364                            all 32 bits of 'nseconds'. */
 365                         READ_BUF(12);
 366                         len += 12;
 367                         READ32(dummy32);
 368                         if (dummy32)
 369                                 return nfserr_inval;
 370                         READ32(iattr->ia_atime.tv_sec);
 371                         READ32(iattr->ia_atime.tv_nsec);
 372                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 373                                 return nfserr_inval;
 374                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 375                         break;
 376                 case NFS4_SET_TO_SERVER_TIME:
 377                         iattr->ia_valid |= ATTR_ATIME;
 378                         break;
 379                 default:
 380                         goto xdr_error;
 381                 }
 382         }
 383         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 384                 READ_BUF(4);
 385                 len += 4;
 386                 READ32(dummy32);
 387                 switch (dummy32) {
 388                 case NFS4_SET_TO_CLIENT_TIME:
 389                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 390                            all 32 bits of 'nseconds'. */
 391                         READ_BUF(12);
 392                         len += 12;
 393                         READ32(dummy32);
 394                         if (dummy32)
 395                                 return nfserr_inval;
 396                         READ32(iattr->ia_mtime.tv_sec);
 397                         READ32(iattr->ia_mtime.tv_nsec);
 398                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 399                                 return nfserr_inval;
 400                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 401                         break;
 402                 case NFS4_SET_TO_SERVER_TIME:
 403                         iattr->ia_valid |= ATTR_MTIME;
 404                         break;
 405                 default:
 406                         goto xdr_error;
 407                 }
 408         }
 409         if (len != expected_len)
 410                 goto xdr_error;
 411
 412         DECODE_TAIL;
 413
 414 out_nfserr:
 415         status = nfserrno(host_err);
 416         goto out;
 417 }
 418
 419 static __be32
 420 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 421 {
 422         DECODE_HEAD;
 423
 424         READ_BUF(sizeof(stateid_t));
 425         READ32(sid->si_generation);
 426         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 427
 428         DECODE_TAIL;
 429 }
 430
 431 static __be32
 432 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 433 {
 434         DECODE_HEAD;
 435
 436         READ_BUF(4);
 437         READ32(access->ac_req_access);
 438
 439         DECODE_TAIL;
 440 }
 441
 442 static __be32
 443 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 444 {
 445         DECODE_HEAD;
 446
 447         close->cl_stateowner = NULL;
 448         READ_BUF(4);
 449         READ32(close->cl_seqid);
 450         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 451
 452         DECODE_TAIL;
 453 }
 454
 455
 456 static __be32
 457 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 458 {
 459         DECODE_HEAD;
 460
 461         READ_BUF(12);
 462         READ64(commit->co_offset);
 463         READ32(commit->co_count);
 464
 465         DECODE_TAIL;
 466 }
 467
 468 static __be32
 469 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 470 {
 471         DECODE_HEAD;
 472
 473         READ_BUF(4);
 474         READ32(create->cr_type);
 475         switch (create->cr_type) {
 476         case NF4LNK:
 477                 READ_BUF(4);
 478                 READ32(create->cr_linklen);
 479                 READ_BUF(create->cr_linklen);
 480                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 481                 break;
 482         case NF4BLK:
 483         case NF4CHR:
 484                 READ_BUF(8);
 485                 READ32(create->cr_specdata1);
 486                 READ32(create->cr_specdata2);
 487                 break;
 488         case NF4SOCK:
 489         case NF4FIFO:
 490         case NF4DIR:
 491         default:
 492                 break;
 493         }
 494
 495         READ_BUF(4);
 496         READ32(create->cr_namelen);
 497         READ_BUF(create->cr_namelen);
 498         SAVEMEM(create->cr_name, create->cr_namelen);
 499         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 500                 return status;
 501
 502         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 503                 goto out;
 504
 505         DECODE_TAIL;
 506 }
 507
 508 static inline __be32
 509 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 510 {
 511         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 512 }
 513
 514 static inline __be32
 515 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 516 {
 517         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 518 }
 519
 520 static __be32
 521 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 522 {
 523         DECODE_HEAD;
 524
 525         READ_BUF(4);
 526         READ32(link->li_namelen);
 527         READ_BUF(link->li_namelen);
 528         SAVEMEM(link->li_name, link->li_namelen);
 529         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 530                 return status;
 531
 532         DECODE_TAIL;
 533 }
 534
 535 static __be32
 536 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 537 {
 538         DECODE_HEAD;
 539
 540         lock->lk_replay_owner = NULL;
 541         /*
 542         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 543         */
 544         READ_BUF(28);
 545         READ32(lock->lk_type);
 546         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 547                 goto xdr_error;
 548         READ32(lock->lk_reclaim);
 549         READ64(lock->lk_offset);
 550         READ64(lock->lk_length);
 551         READ32(lock->lk_is_new);
 552
 553         if (lock->lk_is_new) {
 554                 READ_BUF(4);
 555                 READ32(lock->lk_new_open_seqid);
 556                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 557                 if (status)
 558                         return status;
 559                 READ_BUF(8 + sizeof(clientid_t));
 560                 READ32(lock->lk_new_lock_seqid);
 561                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 562                 READ32(lock->lk_new_owner.len);
 563                 READ_BUF(lock->lk_new_owner.len);
 564                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 565         } else {
 566                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 567                 if (status)
 568                         return status;
 569                 READ_BUF(4);
 570                 READ32(lock->lk_old_lock_seqid);
 571         }
 572
 573         DECODE_TAIL;
 574 }
 575
 576 static __be32
 577 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 578 {
 579         DECODE_HEAD;
 580
 581         READ_BUF(32);
 582         READ32(lockt->lt_type);
 583         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 584                 goto xdr_error;
 585         READ64(lockt->lt_offset);
 586         READ64(lockt->lt_length);
 587         COPYMEM(&lockt->lt_clientid, 8);
 588         READ32(lockt->lt_owner.len);
 589         READ_BUF(lockt->lt_owner.len);
 590         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 591
 592         if (argp->minorversion && !zero_clientid(&lockt->lt_clientid))
 593                 return nfserr_inval;
 594         DECODE_TAIL;
 595 }
 596
 597 static __be32
 598 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 599 {
 600         DECODE_HEAD;
 601
 602         locku->lu_stateowner = NULL;
 603         READ_BUF(8);
 604         READ32(locku->lu_type);
 605         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 606                 goto xdr_error;
 607         READ32(locku->lu_seqid);
 608         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 609         if (status)
 610                 return status;
 611         READ_BUF(16);
 612         READ64(locku->lu_offset);
 613         READ64(locku->lu_length);
 614
 615         DECODE_TAIL;
 616 }
 617
 618 static __be32
 619 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 620 {
 621         DECODE_HEAD;
 622
 623         READ_BUF(4);
 624         READ32(lookup->lo_len);
 625         READ_BUF(lookup->lo_len);
 626         SAVEMEM(lookup->lo_name, lookup->lo_len);
 627         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 628                 return status;
 629
 630         DECODE_TAIL;
 631 }
 632
 633 static __be32
 634 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 635 {
 636         DECODE_HEAD;
 637
 638         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 639         open->op_iattr.ia_valid = 0;
 640         open->op_stateowner = NULL;
 641
 642         /* seqid, share_access, share_deny, clientid, ownerlen */
 643         READ_BUF(16 + sizeof(clientid_t));
 644         READ32(open->op_seqid);
 645         READ32(open->op_share_access);
 646         READ32(open->op_share_deny);
 647         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 648         READ32(open->op_owner.len);
 649
 650         /* owner, open_flag */
 651         READ_BUF(open->op_owner.len + 4);
 652         SAVEMEM(open->op_owner.data, open->op_owner.len);
 653         READ32(open->op_create);
 654         switch (open->op_create) {
 655         case NFS4_OPEN_NOCREATE:
 656                 break;
 657         case NFS4_OPEN_CREATE:
 658                 READ_BUF(4);
 659                 READ32(open->op_createmode);
 660                 switch (open->op_createmode) {
 661                 case NFS4_CREATE_UNCHECKED:
 662                 case NFS4_CREATE_GUARDED:
 663                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 664                                 goto out;
 665                         break;
 666                 case NFS4_CREATE_EXCLUSIVE:
 667                         READ_BUF(8);
 668                         COPYMEM(open->op_verf.data, 8);
 669                         break;
 670                 default:
 671                         goto xdr_error;
 672                 }
 673                 break;
 674         default:
 675                 goto xdr_error;
 676         }
 677
 678         /* open_claim */
 679         READ_BUF(4);
 680         READ32(open->op_claim_type);
 681         switch (open->op_claim_type) {
 682         case NFS4_OPEN_CLAIM_NULL:
 683         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 684                 READ_BUF(4);
 685                 READ32(open->op_fname.len);
 686                 READ_BUF(open->op_fname.len);
 687                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 688                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 689                         return status;
 690                 break;
 691         case NFS4_OPEN_CLAIM_PREVIOUS:
 692                 READ_BUF(4);
 693                 READ32(open->op_delegate_type);
 694                 break;
 695         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 696                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 697                 if (status)
 698                         return status;
 699                 READ_BUF(4);
 700                 READ32(open->op_fname.len);
 701                 READ_BUF(open->op_fname.len);
 702                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 703                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 704                         return status;
 705                 break;
 706         default:
 707                 goto xdr_error;
 708         }
 709
 710         DECODE_TAIL;
 711 }
 712
 713 static __be32
 714 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 715 {
 716         DECODE_HEAD;
 717
 718         open_conf->oc_stateowner = NULL;
 719         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 720         if (status)
 721                 return status;
 722         READ_BUF(4);
 723         READ32(open_conf->oc_seqid);
 724
 725         DECODE_TAIL;
 726 }
 727
 728 static __be32
 729 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 730 {
 731         DECODE_HEAD;
 732
 733         open_down->od_stateowner = NULL;
 734         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 735         if (status)
 736                 return status;
 737         READ_BUF(12);
 738         READ32(open_down->od_seqid);
 739         READ32(open_down->od_share_access);
 740         READ32(open_down->od_share_deny);
 741
 742         DECODE_TAIL;
 743 }
 744
 745 static __be32
 746 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 747 {
 748         DECODE_HEAD;
 749
 750         READ_BUF(4);
 751         READ32(putfh->pf_fhlen);
 752         if (putfh->pf_fhlen > NFS4_FHSIZE)
 753                 goto xdr_error;
 754         READ_BUF(putfh->pf_fhlen);
 755         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 756
 757         DECODE_TAIL;
 758 }
 759
 760 static __be32
 761 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 762 {
 763         DECODE_HEAD;
 764
 765         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 766         if (status)
 767                 return status;
 768         READ_BUF(12);
 769         READ64(read->rd_offset);
 770         READ32(read->rd_length);
 771
 772         DECODE_TAIL;
 773 }
 774
 775 static __be32
 776 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 777 {
 778         DECODE_HEAD;
 779
 780         READ_BUF(24);
 781         READ64(readdir->rd_cookie);
 782         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 783         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 784         READ32(readdir->rd_maxcount);
 785         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 786                 goto out;
 787
 788         DECODE_TAIL;
 789 }
 790
 791 static __be32
 792 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 793 {
 794         DECODE_HEAD;
 795
 796         READ_BUF(4);
 797         READ32(remove->rm_namelen);
 798         READ_BUF(remove->rm_namelen);
 799         SAVEMEM(remove->rm_name, remove->rm_namelen);
 800         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 801                 return status;
 802
 803         DECODE_TAIL;
 804 }
 805
 806 static __be32
 807 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 808 {
 809         DECODE_HEAD;
 810
 811         READ_BUF(4);
 812         READ32(rename->rn_snamelen);
 813         READ_BUF(rename->rn_snamelen + 4);
 814         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 815         READ32(rename->rn_tnamelen);
 816         READ_BUF(rename->rn_tnamelen);
 817         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 818         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 819                 return status;
 820         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 821                 return status;
 822
 823         DECODE_TAIL;
 824 }
 825
 826 static __be32
 827 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 828 {
 829         DECODE_HEAD;
 830
 831         READ_BUF(sizeof(clientid_t));
 832         COPYMEM(clientid, sizeof(clientid_t));
 833
 834         DECODE_TAIL;
 835 }
 836
 837 static __be32
 838 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 839                      struct nfsd4_secinfo *secinfo)
 840 {
 841         DECODE_HEAD;
 842
 843         READ_BUF(4);
 844         READ32(secinfo->si_namelen);
 845         READ_BUF(secinfo->si_namelen);
 846         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 847         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 848                                                                 nfserr_noent);
 849         if (status)
 850                 return status;
 851         DECODE_TAIL;
 852 }
 853
 854 static __be32
 855 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 856 {
 857         __be32 status;
 858
 859         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 860         if (status)
 861                 return status;
 862         return nfsd4_decode_fattr(argp, setattr->sa_bmval,
 863                                   &setattr->sa_iattr, &setattr->sa_acl);
 864 }
 865
 866 static __be32
 867 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 868 {
 869         DECODE_HEAD;
 870
 871         READ_BUF(12);
 872         COPYMEM(setclientid->se_verf.data, 8);
 873         READ32(setclientid->se_namelen);
 874
 875         READ_BUF(setclientid->se_namelen + 8);
 876         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 877         READ32(setclientid->se_callback_prog);
 878         READ32(setclientid->se_callback_netid_len);
 879
 880         READ_BUF(setclientid->se_callback_netid_len + 4);
 881         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 882         READ32(setclientid->se_callback_addr_len);
 883
 884         READ_BUF(setclientid->se_callback_addr_len + 4);
 885         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 886         READ32(setclientid->se_callback_ident);
 887
 888         DECODE_TAIL;
 889 }
 890
 891 static __be32
 892 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 893 {
 894         DECODE_HEAD;
 895
 896         READ_BUF(8 + sizeof(nfs4_verifier));
 897         COPYMEM(&scd_c->sc_clientid, 8);
 898         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 899
 900         DECODE_TAIL;
 901 }
 902
 903 /* Also used for NVERIFY */
 904 static __be32
 905 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 906 {
 907 #if 0
 908         struct nfsd4_compoundargs save = {
 909                 .p = argp->p,
 910                 .end = argp->end,
 911                 .rqstp = argp->rqstp,
 912         };
 913         u32             ve_bmval[2];
 914         struct iattr    ve_iattr;           /* request */
 915         struct nfs4_acl *ve_acl;            /* request */
 916 #endif
 917         DECODE_HEAD;
 918
 919         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 920                 goto out;
 921
 922         /* For convenience's sake, we compare raw xdr'd attributes in
 923          * nfsd4_proc_verify; however we still decode here just to return
 924          * correct error in case of bad xdr. */
 925 #if 0
 926         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 927         if (status == nfserr_inval) {
 928                 status = nfserrno(status);
 929                 goto out;
 930         }
 931 #endif
 932         READ_BUF(4);
 933         READ32(verify->ve_attrlen);
 934         READ_BUF(verify->ve_attrlen);
 935         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 936
 937         DECODE_TAIL;
 938 }
 939
 940 static __be32
 941 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 942 {
 943         int avail;
 944         int v;
 945         int len;
 946         DECODE_HEAD;
 947
 948         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
 949         if (status)
 950                 return status;
 951         READ_BUF(16);
 952         READ64(write->wr_offset);
 953         READ32(write->wr_stable_how);
 954         if (write->wr_stable_how > 2)
 955                 goto xdr_error;
 956         READ32(write->wr_buflen);
 957
 958         /* Sorry .. no magic macros for this.. *
 959          * READ_BUF(write->wr_buflen);
 960          * SAVEMEM(write->wr_buf, write->wr_buflen);
 961          */
 962         avail = (char*)argp->end - (char*)argp->p;
 963         if (avail + argp->pagelen < write->wr_buflen) {
 964                 dprintk("NFSD: xdr error (%s:%d)\n",
 965                                 __FILE__, __LINE__);
 966                 goto xdr_error;
 967         }
 968         argp->rqstp->rq_vec[0].iov_base = p;
 969         argp->rqstp->rq_vec[0].iov_len = avail;
 970         v = 0;
 971         len = write->wr_buflen;
 972         while (len > argp->rqstp->rq_vec[v].iov_len) {
 973                 len -= argp->rqstp->rq_vec[v].iov_len;
 974                 v++;
 975                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 976                 argp->pagelist++;
 977                 if (argp->pagelen >= PAGE_SIZE) {
 978                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 979                         argp->pagelen -= PAGE_SIZE;
 980                 } else {
 981                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 982                         argp->pagelen -= len;
 983                 }
 984         }
 985         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 986         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 987         argp->rqstp->rq_vec[v].iov_len = len;
 988         write->wr_vlen = v+1;
 989
 990         DECODE_TAIL;
 991 }
 992
 993 static __be32
 994 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 995 {
 996         DECODE_HEAD;
 997
 998         READ_BUF(12);
 999         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1000         READ32(rlockowner->rl_owner.len);
1001         READ_BUF(rlockowner->rl_owner.len);
1002         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1003
1004         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1005                 return nfserr_inval;
1006         DECODE_TAIL;
1007 }
1008
1009 static __be32
1010 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1011                          struct nfsd4_exchange_id *exid)
1012 {
1013         int dummy;
1014         DECODE_HEAD;
1015
1016         READ_BUF(NFS4_VERIFIER_SIZE);
1017         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1018
1019         READ_BUF(4);
1020         READ32(exid->clname.len);
1021
1022         READ_BUF(exid->clname.len);
1023         SAVEMEM(exid->clname.data, exid->clname.len);
1024
1025         READ_BUF(4);
1026         READ32(exid->flags);
1027
1028         /* Ignore state_protect4_a */
1029         READ_BUF(4);
1030         READ32(exid->spa_how);
1031         switch (exid->spa_how) {
1032         case SP4_NONE:
1033                 break;
1034         case SP4_MACH_CRED:
1035                 /* spo_must_enforce */
1036                 READ_BUF(4);
1037                 READ32(dummy);
1038                 READ_BUF(dummy * 4);
1039                 p += dummy;
1040
1041                 /* spo_must_allow */
1042                 READ_BUF(4);
1043                 READ32(dummy);
1044                 READ_BUF(dummy * 4);
1045                 p += dummy;
1046                 break;
1047         case SP4_SSV:
1048                 /* ssp_ops */
1049                 READ_BUF(4);
1050                 READ32(dummy);
1051                 READ_BUF(dummy * 4);
1052                 p += dummy;
1053
1054                 READ_BUF(4);
1055                 READ32(dummy);
1056                 READ_BUF(dummy * 4);
1057                 p += dummy;
1058
1059                 /* ssp_hash_algs<> */
1060                 READ_BUF(4);
1061                 READ32(dummy);
1062                 READ_BUF(dummy);
1063                 p += XDR_QUADLEN(dummy);
1064
1065                 /* ssp_encr_algs<> */
1066                 READ_BUF(4);
1067                 READ32(dummy);
1068                 READ_BUF(dummy);
1069                 p += XDR_QUADLEN(dummy);
1070
1071                 /* ssp_window and ssp_num_gss_handles */
1072                 READ_BUF(8);
1073                 READ32(dummy);
1074                 READ32(dummy);
1075                 break;
1076         default:
1077                 goto xdr_error;
1078         }
1079
1080         /* Ignore Implementation ID */
1081         READ_BUF(4);    /* nfs_impl_id4 array length */
1082         READ32(dummy);
1083
1084         if (dummy > 1)
1085                 goto xdr_error;
1086
1087         if (dummy == 1) {
1088                 /* nii_domain */
1089                 READ_BUF(4);
1090                 READ32(dummy);
1091                 READ_BUF(dummy);
1092                 p += XDR_QUADLEN(dummy);
1093
1094                 /* nii_name */
1095                 READ_BUF(4);
1096                 READ32(dummy);
1097                 READ_BUF(dummy);
1098                 p += XDR_QUADLEN(dummy);
1099
1100                 /* nii_date */
1101                 READ_BUF(12);
1102                 p += 3;
1103         }
1104         DECODE_TAIL;
1105 }
1106
1107 static __be32
1108 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1109                             struct nfsd4_create_session *sess)
1110 {
1111         DECODE_HEAD;
1112
1113         u32 dummy;
1114         char *machine_name;
1115         int i;
1116         int nr_secflavs;
1117
1118         READ_BUF(16);
1119         COPYMEM(&sess->clientid, 8);
1120         READ32(sess->seqid);
1121         READ32(sess->flags);
1122
1123         /* Fore channel attrs */
1124         READ_BUF(28);
1125         READ32(dummy); /* headerpadsz is always 0 */
1126         READ32(sess->fore_channel.maxreq_sz);
1127         READ32(sess->fore_channel.maxresp_sz);
1128         READ32(sess->fore_channel.maxresp_cached);
1129         READ32(sess->fore_channel.maxops);
1130         READ32(sess->fore_channel.maxreqs);
1131         READ32(sess->fore_channel.nr_rdma_attrs);
1132         if (sess->fore_channel.nr_rdma_attrs == 1) {
1133                 READ_BUF(4);
1134                 READ32(sess->fore_channel.rdma_attrs);
1135         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1136                 dprintk("Too many fore channel attr bitmaps!\n");
1137                 goto xdr_error;
1138         }
1139
1140         /* Back channel attrs */
1141         READ_BUF(28);
1142         READ32(dummy); /* headerpadsz is always 0 */
1143         READ32(sess->back_channel.maxreq_sz);
1144         READ32(sess->back_channel.maxresp_sz);
1145         READ32(sess->back_channel.maxresp_cached);
1146         READ32(sess->back_channel.maxops);
1147         READ32(sess->back_channel.maxreqs);
1148         READ32(sess->back_channel.nr_rdma_attrs);
1149         if (sess->back_channel.nr_rdma_attrs == 1) {
1150                 READ_BUF(4);
1151                 READ32(sess->back_channel.rdma_attrs);
1152         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1153                 dprintk("Too many back channel attr bitmaps!\n");
1154                 goto xdr_error;
1155         }
1156
1157         READ_BUF(8);
1158         READ32(sess->callback_prog);
1159
1160         /* callback_sec_params4 */
1161         READ32(nr_secflavs);
1162         for (i = 0; i < nr_secflavs; ++i) {
1163                 READ_BUF(4);
1164                 READ32(dummy);
1165                 switch (dummy) {
1166                 case RPC_AUTH_NULL:
1167                         /* Nothing to read */
1168                         break;
1169                 case RPC_AUTH_UNIX:
1170                         READ_BUF(8);
1171                         /* stamp */
1172                         READ32(dummy);
1173
1174                         /* machine name */
1175                         READ32(dummy);
1176                         READ_BUF(dummy);
1177                         SAVEMEM(machine_name, dummy);
1178
1179                         /* uid, gid */
1180                         READ_BUF(8);
1181                         READ32(sess->uid);
1182                         READ32(sess->gid);
1183
1184                         /* more gids */
1185                         READ_BUF(4);
1186                         READ32(dummy);
1187                         READ_BUF(dummy * 4);
1188                         for (i = 0; i < dummy; ++i)
1189                                 READ32(dummy);
1190                         break;
1191                 case RPC_AUTH_GSS:
1192                         dprintk("RPC_AUTH_GSS callback secflavor "
1193                                 "not supported!\n");
1194                         READ_BUF(8);
1195                         /* gcbp_service */
1196                         READ32(dummy);
1197                         /* gcbp_handle_from_server */
1198                         READ32(dummy);
1199                         READ_BUF(dummy);
1200                         p += XDR_QUADLEN(dummy);
1201                         /* gcbp_handle_from_client */
1202                         READ_BUF(4);
1203                         READ32(dummy);
1204                         READ_BUF(dummy);
1205                         p += XDR_QUADLEN(dummy);
1206                         break;
1207                 default:
1208                         dprintk("Illegal callback secflavor\n");
1209                         return nfserr_inval;
1210                 }
1211         }
1212         DECODE_TAIL;
1213 }
1214
1215 static __be32
1216 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1217                              struct nfsd4_destroy_session *destroy_session)
1218 {
1219         DECODE_HEAD;
1220         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1221         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1222
1223         DECODE_TAIL;
1224 }
1225
1226 static __be32
1227 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1228                       struct nfsd4_sequence *seq)
1229 {
1230         DECODE_HEAD;
1231
1232         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1233         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1234         READ32(seq->seqid);
1235         READ32(seq->slotid);
1236         READ32(seq->maxslots);
1237         READ32(seq->cachethis);
1238
1239         DECODE_TAIL;
1240 }
1241
1242 static __be32
1243 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1244 {
1245         return nfs_ok;
1246 }
1247
1248 static __be32
1249 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1250 {
1251         return nfserr_notsupp;
1252 }
1253
1254 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1255
1256 static nfsd4_dec nfsd4_dec_ops[] = {
1257         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1258         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1259         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1260         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1261         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1262         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1263         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1264         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1265         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1266         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1267         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1268         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1269         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1270         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1271         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1272         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1273         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1274         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1275         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1276         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1277         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1278         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1279         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1280         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1281         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1282         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1283         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1284         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1285         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1286         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1287         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1288         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1289         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1290         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1291         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1292         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1293         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1294 };
1295
1296 static nfsd4_dec nfsd41_dec_ops[] = {
1297         [OP_ACCESS]             (nfsd4_dec)nfsd4_decode_access,
1298         [OP_CLOSE]              (nfsd4_dec)nfsd4_decode_close,
1299         [OP_COMMIT]             (nfsd4_dec)nfsd4_decode_commit,
1300         [OP_CREATE]             (nfsd4_dec)nfsd4_decode_create,
1301         [OP_DELEGPURGE]         (nfsd4_dec)nfsd4_decode_notsupp,
1302         [OP_DELEGRETURN]        (nfsd4_dec)nfsd4_decode_delegreturn,
1303         [OP_GETATTR]            (nfsd4_dec)nfsd4_decode_getattr,
1304         [OP_GETFH]              (nfsd4_dec)nfsd4_decode_noop,
1305         [OP_LINK]               (nfsd4_dec)nfsd4_decode_link,
1306         [OP_LOCK]               (nfsd4_dec)nfsd4_decode_lock,
1307         [OP_LOCKT]              (nfsd4_dec)nfsd4_decode_lockt,
1308         [OP_LOCKU]              (nfsd4_dec)nfsd4_decode_locku,
1309         [OP_LOOKUP]             (nfsd4_dec)nfsd4_decode_lookup,
1310         [OP_LOOKUPP]            (nfsd4_dec)nfsd4_decode_noop,
1311         [OP_NVERIFY]            (nfsd4_dec)nfsd4_decode_verify,
1312         [OP_OPEN]               (nfsd4_dec)nfsd4_decode_open,
1313         [OP_OPENATTR]           (nfsd4_dec)nfsd4_decode_notsupp,
1314         [OP_OPEN_CONFIRM]       (nfsd4_dec)nfsd4_decode_notsupp,
1315         [OP_OPEN_DOWNGRADE]     (nfsd4_dec)nfsd4_decode_open_downgrade,
1316         [OP_PUTFH]              (nfsd4_dec)nfsd4_decode_putfh,
1317         [OP_PUTPUBFH]           (nfsd4_dec)nfsd4_decode_notsupp,
1318         [OP_PUTROOTFH]          (nfsd4_dec)nfsd4_decode_noop,
1319         [OP_READ]               (nfsd4_dec)nfsd4_decode_read,
1320         [OP_READDIR]            (nfsd4_dec)nfsd4_decode_readdir,
1321         [OP_READLINK]           (nfsd4_dec)nfsd4_decode_noop,
1322         [OP_REMOVE]             (nfsd4_dec)nfsd4_decode_remove,
1323         [OP_RENAME]             (nfsd4_dec)nfsd4_decode_rename,
1324         [OP_RENEW]              (nfsd4_dec)nfsd4_decode_notsupp,
1325         [OP_RESTOREFH]          (nfsd4_dec)nfsd4_decode_noop,
1326         [OP_SAVEFH]             (nfsd4_dec)nfsd4_decode_noop,
1327         [OP_SECINFO]            (nfsd4_dec)nfsd4_decode_secinfo,
1328         [OP_SETATTR]            (nfsd4_dec)nfsd4_decode_setattr,
1329         [OP_SETCLIENTID]        (nfsd4_dec)nfsd4_decode_notsupp,
1330         [OP_SETCLIENTID_CONFIRM](nfsd4_dec)nfsd4_decode_notsupp,
1331         [OP_VERIFY]             (nfsd4_dec)nfsd4_decode_verify,
1332         [OP_WRITE]              (nfsd4_dec)nfsd4_decode_write,
1333         [OP_RELEASE_LOCKOWNER]  (nfsd4_dec)nfsd4_decode_notsupp,
1334
1335         /* new operations for NFSv4.1 */
1336         [OP_BACKCHANNEL_CTL]    (nfsd4_dec)nfsd4_decode_notsupp,
1337         [OP_BIND_CONN_TO_SESSION](nfsd4_dec)nfsd4_decode_notsupp,
1338         [OP_EXCHANGE_ID]        (nfsd4_dec)nfsd4_decode_exchange_id,
1339         [OP_CREATE_SESSION]     (nfsd4_dec)nfsd4_decode_create_session,
1340         [OP_DESTROY_SESSION]    (nfsd4_dec)nfsd4_decode_destroy_session,
1341         [OP_FREE_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1342         [OP_GET_DIR_DELEGATION] (nfsd4_dec)nfsd4_decode_notsupp,
1343         [OP_GETDEVICEINFO]      (nfsd4_dec)nfsd4_decode_notsupp,
1344         [OP_GETDEVICELIST]      (nfsd4_dec)nfsd4_decode_notsupp,
1345         [OP_LAYOUTCOMMIT]       (nfsd4_dec)nfsd4_decode_notsupp,
1346         [OP_LAYOUTGET]          (nfsd4_dec)nfsd4_decode_notsupp,
1347         [OP_LAYOUTRETURN]       (nfsd4_dec)nfsd4_decode_notsupp,
1348         [OP_SECINFO_NO_NAME]    (nfsd4_dec)nfsd4_decode_notsupp,
1349         [OP_SEQUENCE]           (nfsd4_dec)nfsd4_decode_sequence,
1350         [OP_SET_SSV]            (nfsd4_dec)nfsd4_decode_notsupp,
1351         [OP_TEST_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1352         [OP_WANT_DELEGATION]    (nfsd4_dec)nfsd4_decode_notsupp,
1353         [OP_DESTROY_CLIENTID]   (nfsd4_dec)nfsd4_decode_notsupp,
1354         [OP_RECLAIM_COMPLETE]   (nfsd4_dec)nfsd4_decode_notsupp,
1355 };
1356
1357 struct nfsd4_minorversion_ops {
1358         nfsd4_dec *decoders;
1359         int nops;
1360 };
1361
1362 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1363         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1364         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1365 };
1366
1367 static __be32
1368 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1369 {
1370         DECODE_HEAD;
1371         struct nfsd4_op *op;
1372         struct nfsd4_minorversion_ops *ops;
1373         int i;
1374
1375         /*
1376          * XXX: According to spec, we should check the tag
1377          * for UTF-8 compliance.  I'm postponing this for
1378          * now because it seems that some clients do use
1379          * binary tags.
1380          */
1381         READ_BUF(4);
1382         READ32(argp->taglen);
1383         READ_BUF(argp->taglen + 8);
1384         SAVEMEM(argp->tag, argp->taglen);
1385         READ32(argp->minorversion);
1386         READ32(argp->opcnt);
1387
1388         if (argp->taglen > NFSD4_MAX_TAGLEN)
1389                 goto xdr_error;
1390         if (argp->opcnt > 100)
1391                 goto xdr_error;
1392
1393         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1394                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1395                 if (!argp->ops) {
1396                         argp->ops = argp->iops;
1397                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1398                         goto xdr_error;
1399                 }
1400         }
1401
1402         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1403                 argp->opcnt = 0;
1404
1405         ops = &nfsd4_minorversion[argp->minorversion];
1406         for (i = 0; i < argp->opcnt; i++) {
1407                 op = &argp->ops[i];
1408                 op->replay = NULL;
1409
1410                 /*
1411                  * We can't use READ_BUF() here because we need to handle
1412                  * a missing opcode as an OP_WRITE + 1. So we need to check
1413                  * to see if we're truly at the end of our buffer or if there
1414                  * is another page we need to flip to.
1415                  */
1416
1417                 if (argp->p == argp->end) {
1418                         if (argp->pagelen < 4) {
1419                                 /* There isn't an opcode still on the wire */
1420                                 op->opnum = OP_WRITE + 1;
1421                                 op->status = nfserr_bad_xdr;
1422                                 argp->opcnt = i+1;
1423                                 break;
1424                         }
1425
1426                         /*
1427                          * False alarm. We just hit a page boundary, but there
1428                          * is still data available.  Move pointer across page
1429                          * boundary.  *snip from READ_BUF*
1430                          */
1431                         argp->p = page_address(argp->pagelist[0]);
1432                         argp->pagelist++;
1433                         if (argp->pagelen < PAGE_SIZE) {
1434                                 argp->end = p + (argp->pagelen>>2);
1435                                 argp->pagelen = 0;
1436                         } else {
1437                                 argp->end = p + (PAGE_SIZE>>2);
1438                                 argp->pagelen -= PAGE_SIZE;
1439                         }
1440                 }
1441                 op->opnum = ntohl(*argp->p++);
1442
1443                 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1444                         op->status = ops->decoders[op->opnum](argp, &op->u);
1445                 else {
1446                         op->opnum = OP_ILLEGAL;
1447                         op->status = nfserr_op_illegal;
1448                 }
1449
1450                 if (op->status) {
1451                         argp->opcnt = i+1;
1452                         break;
1453                 }
1454         }
1455
1456         DECODE_TAIL;
1457 }
1458 /*
1459  * END OF "GENERIC" DECODE ROUTINES.
1460  */
1461
1462 /*
1463  * START OF "GENERIC" ENCODE ROUTINES.
1464  *   These may look a little ugly since they are imported from a "generic"
1465  * set of XDR encode/decode routines which are intended to be shared by
1466  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1467  *
1468  * If the pain of reading these is too great, it should be a straightforward
1469  * task to translate them into Linux-specific versions which are more
1470  * consistent with the style used in NFSv2/v3...
1471  */
1472 #define ENCODE_HEAD              __be32 *p
1473
1474 #define WRITE32(n)               *p++ = htonl(n)
1475 #define WRITE64(n)               do {                           \
1476         *p++ = htonl((u32)((n) >> 32));                         \
1477         *p++ = htonl((u32)(n));                                 \
1478 } while (0)
1479 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1480         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1481         memcpy(p, ptr, nbytes);                                 \
1482         p += XDR_QUADLEN(nbytes);                               \
1483 }} while (0)
1484 #define WRITECINFO(c)           do {                            \
1485         *p++ = htonl(c.atomic);                                 \
1486         *p++ = htonl(c.before_ctime_sec);                               \
1487         *p++ = htonl(c.before_ctime_nsec);                              \
1488         *p++ = htonl(c.after_ctime_sec);                                \
1489         *p++ = htonl(c.after_ctime_nsec);                               \
1490 } while (0)
1491
1492 #define RESERVE_SPACE(nbytes)   do {                            \
1493         p = resp->p;                                            \
1494         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1495 } while (0)
1496 #define ADJUST_ARGS()           resp->p = p
1497
1498 /*
1499  * Header routine to setup seqid operation replay cache
1500  */
1501 #define ENCODE_SEQID_OP_HEAD                                    \
1502         __be32 *save;                                           \
1503                                                                 \
1504         save = resp->p;
1505
1506 /*
1507  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1508  * is where sequence id's are incremented, and the replay cache is filled.
1509  * Note that we increment sequence id's here, at the last moment, so we're sure
1510  * we know whether the error to be returned is a sequence id mutating error.
1511  */
1512
1513 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1514         if (seqid_mutating_err(nfserr) && stateowner) {         \
1515                 stateowner->so_seqid++;                         \
1516                 stateowner->so_replay.rp_status = nfserr;       \
1517                 stateowner->so_replay.rp_buflen =               \
1518                           (((char *)(resp)->p - (char *)save)); \
1519                 memcpy(stateowner->so_replay.rp_buf, save,      \
1520                         stateowner->so_replay.rp_buflen);       \
1521         } } while (0);
1522
1523 /* Encode as an array of strings the string given with components
1524  * seperated @sep.
1525  */
1526 static __be32 nfsd4_encode_components(char sep, char *components,
1527                                    __be32 **pp, int *buflen)
1528 {
1529         __be32 *p = *pp;
1530         __be32 *countp = p;
1531         int strlen, count=0;
1532         char *str, *end;
1533
1534         dprintk("nfsd4_encode_components(%s)\n", components);
1535         if ((*buflen -= 4) < 0)
1536                 return nfserr_resource;
1537         WRITE32(0); /* We will fill this in with @count later */
1538         end = str = components;
1539         while (*end) {
1540                 for (; *end && (*end != sep); end++)
1541                         ; /* Point to end of component */
1542                 strlen = end - str;
1543                 if (strlen) {
1544                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1545                                 return nfserr_resource;
1546                         WRITE32(strlen);
1547                         WRITEMEM(str, strlen);
1548                         count++;
1549                 }
1550                 else
1551                         end++;
1552                 str = end;
1553         }
1554         *pp = p;
1555         p = countp;
1556         WRITE32(count);
1557         return 0;
1558 }
1559
1560 /*
1561  * encode a location element of a fs_locations structure
1562  */
1563 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1564                                     __be32 **pp, int *buflen)
1565 {
1566         __be32 status;
1567         __be32 *p = *pp;
1568
1569         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1570         if (status)
1571                 return status;
1572         status = nfsd4_encode_components('/', location->path, &p, buflen);
1573         if (status)
1574                 return status;
1575         *pp = p;
1576         return 0;
1577 }
1578
1579 /*
1580  * Return the path to an export point in the pseudo filesystem namespace
1581  * Returned string is safe to use as long as the caller holds a reference
1582  * to @exp.
1583  */
1584 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1585 {
1586         struct svc_fh tmp_fh;
1587         char *path, *rootpath;
1588
1589         fh_init(&tmp_fh, NFS4_FHSIZE);
1590         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1591         if (*stat)
1592                 return NULL;
1593         rootpath = tmp_fh.fh_export->ex_pathname;
1594
1595         path = exp->ex_pathname;
1596
1597         if (strncmp(path, rootpath, strlen(rootpath))) {
1598                 dprintk("nfsd: fs_locations failed;"
1599                         "%s is not contained in %s\n", path, rootpath);
1600                 *stat = nfserr_notsupp;
1601                 return NULL;
1602         }
1603
1604         return path + strlen(rootpath);
1605 }
1606
1607 /*
1608  *  encode a fs_locations structure
1609  */
1610 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1611                                      struct svc_export *exp,
1612                                      __be32 **pp, int *buflen)
1613 {
1614         __be32 status;
1615         int i;
1616         __be32 *p = *pp;
1617         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1618         char *root = nfsd4_path(rqstp, exp, &status);
1619
1620         if (status)
1621                 return status;
1622         status = nfsd4_encode_components('/', root, &p, buflen);
1623         if (status)
1624                 return status;
1625         if ((*buflen -= 4) < 0)
1626                 return nfserr_resource;
1627         WRITE32(fslocs->locations_count);
1628         for (i=0; i<fslocs->locations_count; i++) {
1629                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1630                                                    &p, buflen);
1631                 if (status)
1632                         return status;
1633         }
1634         *pp = p;
1635         return 0;
1636 }
1637
1638 static u32 nfs4_ftypes[16] = {
1639         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1640         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1641         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1642         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1643 };
1644
1645 static __be32
1646 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1647                         __be32 **p, int *buflen)
1648 {
1649         int status;
1650
1651         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1652                 return nfserr_resource;
1653         if (whotype != NFS4_ACL_WHO_NAMED)
1654                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1655         else if (group)
1656                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1657         else
1658                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1659         if (status < 0)
1660                 return nfserrno(status);
1661         *p = xdr_encode_opaque(*p, NULL, status);
1662         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1663         BUG_ON(*buflen < 0);
1664         return 0;
1665 }
1666
1667 static inline __be32
1668 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1669 {
1670         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1671 }
1672
1673 static inline __be32
1674 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1675 {
1676         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1677 }
1678
1679 static inline __be32
1680 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1681                 __be32 **p, int *buflen)
1682 {
1683         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1684 }
1685
1686 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1687                               FATTR4_WORD0_RDATTR_ERROR)
1688 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1689
1690 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1691 {
1692         /* As per referral draft:  */
1693         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1694             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1695                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1696                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1697                         *rdattr_err = NFSERR_MOVED;
1698                 else
1699                         return nfserr_moved;
1700         }
1701         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1702         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1703         return 0;
1704 }
1705
1706 /*
1707  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1708  * ourselves.
1709  *
1710  * @countp is the buffer size in _words_; upon successful return this becomes
1711  * replaced with the number of words written.
1712  */
1713 __be32
1714 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1715                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1716                 struct svc_rqst *rqstp, int ignore_crossmnt)
1717 {
1718         u32 bmval0 = bmval[0];
1719         u32 bmval1 = bmval[1];
1720         struct kstat stat;
1721         struct svc_fh tempfh;
1722         struct kstatfs statfs;
1723         int buflen = *countp << 2;
1724         __be32 *attrlenp;
1725         u32 dummy;
1726         u64 dummy64;
1727         u32 rdattr_err = 0;
1728         __be32 *p = buffer;
1729         __be32 status;
1730         int err;
1731         int aclsupport = 0;
1732         struct nfs4_acl *acl = NULL;
1733
1734         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1735         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1736         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1737
1738         if (exp->ex_fslocs.migrated) {
1739                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1740                 if (status)
1741                         goto out;
1742         }
1743
1744         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1745         if (err)
1746                 goto out_nfserr;
1747         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1748                         FATTR4_WORD0_MAXNAME)) ||
1749             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1750                        FATTR4_WORD1_SPACE_TOTAL))) {
1751                 err = vfs_statfs(dentry, &statfs);
1752                 if (err)
1753                         goto out_nfserr;
1754         }
1755         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1756                 fh_init(&tempfh, NFS4_FHSIZE);
1757                 status = fh_compose(&tempfh, exp, dentry, NULL);
1758                 if (status)
1759                         goto out;
1760                 fhp = &tempfh;
1761         }
1762         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1763                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1764                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1765                 aclsupport = (err == 0);
1766                 if (bmval0 & FATTR4_WORD0_ACL) {
1767                         if (err == -EOPNOTSUPP)
1768                                 bmval0 &= ~FATTR4_WORD0_ACL;
1769                         else if (err == -EINVAL) {
1770                                 status = nfserr_attrnotsupp;
1771                                 goto out;
1772                         } else if (err != 0)
1773                                 goto out_nfserr;
1774                 }
1775         }
1776         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1777                 if (exp->ex_fslocs.locations == NULL) {
1778                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1779                 }
1780         }
1781         if ((buflen -= 16) < 0)
1782                 goto out_resource;
1783
1784         WRITE32(2);
1785         WRITE32(bmval0);
1786         WRITE32(bmval1);
1787         attrlenp = p++;                /* to be backfilled later */
1788
1789         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1790                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1791                 if ((buflen -= 12) < 0)
1792                         goto out_resource;
1793                 if (!aclsupport)
1794                         word0 &= ~FATTR4_WORD0_ACL;
1795                 if (!exp->ex_fslocs.locations)
1796                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1797                 WRITE32(2);
1798                 WRITE32(word0);
1799                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1800         }
1801         if (bmval0 & FATTR4_WORD0_TYPE) {
1802                 if ((buflen -= 4) < 0)
1803                         goto out_resource;
1804                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1805                 if (dummy == NF4BAD)
1806                         goto out_serverfault;
1807                 WRITE32(dummy);
1808         }
1809         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1810                 if ((buflen -= 4) < 0)
1811                         goto out_resource;
1812                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1813                         WRITE32(NFS4_FH_PERSISTENT);
1814                 else
1815                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1816         }
1817         if (bmval0 & FATTR4_WORD0_CHANGE) {
1818                 /*
1819                  * Note: This _must_ be consistent with the scheme for writing
1820                  * change_info, so any changes made here must be reflected there
1821                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1822                  * macro above.)
1823                  */
1824                 if ((buflen -= 8) < 0)
1825                         goto out_resource;
1826                 WRITE32(stat.ctime.tv_sec);
1827                 WRITE32(stat.ctime.tv_nsec);
1828         }
1829         if (bmval0 & FATTR4_WORD0_SIZE) {
1830                 if ((buflen -= 8) < 0)
1831                         goto out_resource;
1832                 WRITE64(stat.size);
1833         }
1834         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1835                 if ((buflen -= 4) < 0)
1836                         goto out_resource;
1837                 WRITE32(1);
1838         }
1839         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1840                 if ((buflen -= 4) < 0)
1841                         goto out_resource;
1842                 WRITE32(1);
1843         }
1844         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1845                 if ((buflen -= 4) < 0)
1846                         goto out_resource;
1847                 WRITE32(0);
1848         }
1849         if (bmval0 & FATTR4_WORD0_FSID) {
1850                 if ((buflen -= 16) < 0)
1851                         goto out_resource;
1852                 if (exp->ex_fslocs.migrated) {
1853                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1854                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1855                 } else switch(fsid_source(fhp)) {
1856                 case FSIDSOURCE_FSID:
1857                         WRITE64((u64)exp->ex_fsid);
1858                         WRITE64((u64)0);
1859                         break;
1860                 case FSIDSOURCE_DEV:
1861                         WRITE32(0);
1862                         WRITE32(MAJOR(stat.dev));
1863                         WRITE32(0);
1864                         WRITE32(MINOR(stat.dev));
1865                         break;
1866                 case FSIDSOURCE_UUID:
1867                         WRITEMEM(exp->ex_uuid, 16);
1868                         break;
1869                 }
1870         }
1871         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1872                 if ((buflen -= 4) < 0)
1873                         goto out_resource;
1874                 WRITE32(0);
1875         }
1876         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1877                 if ((buflen -= 4) < 0)
1878                         goto out_resource;
1879                 WRITE32(NFSD_LEASE_TIME);
1880         }
1881         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1882                 if ((buflen -= 4) < 0)
1883                         goto out_resource;
1884                 WRITE32(rdattr_err);
1885         }
1886         if (bmval0 & FATTR4_WORD0_ACL) {
1887                 struct nfs4_ace *ace;
1888
1889                 if (acl == NULL) {
1890                         if ((buflen -= 4) < 0)
1891                                 goto out_resource;
1892
1893                         WRITE32(0);
1894                         goto out_acl;
1895                 }
1896                 if ((buflen -= 4) < 0)
1897                         goto out_resource;
1898                 WRITE32(acl->naces);
1899
1900                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1901                         if ((buflen -= 4*3) < 0)
1902                                 goto out_resource;
1903                         WRITE32(ace->type);
1904                         WRITE32(ace->flag);
1905                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1906                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1907                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1908                                 &p, &buflen);
1909                         if (status == nfserr_resource)
1910                                 goto out_resource;
1911                         if (status)
1912                                 goto out;
1913                 }
1914         }
1915 out_acl:
1916         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1917                 if ((buflen -= 4) < 0)
1918                         goto out_resource;
1919                 WRITE32(aclsupport ?
1920                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1921         }
1922         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1923                 if ((buflen -= 4) < 0)
1924                         goto out_resource;
1925                 WRITE32(1);
1926         }
1927         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1928                 if ((buflen -= 4) < 0)
1929                         goto out_resource;
1930                 WRITE32(1);
1931         }
1932         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1933                 if ((buflen -= 4) < 0)
1934                         goto out_resource;
1935                 WRITE32(1);
1936         }
1937         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1938                 if ((buflen -= 4) < 0)
1939                         goto out_resource;
1940                 WRITE32(1);
1941         }
1942         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1943                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1944                 if (buflen < 0)
1945                         goto out_resource;
1946                 WRITE32(fhp->fh_handle.fh_size);
1947                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1948         }
1949         if (bmval0 & FATTR4_WORD0_FILEID) {
1950                 if ((buflen -= 8) < 0)
1951                         goto out_resource;
1952                 WRITE64(stat.ino);
1953         }
1954         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1955                 if ((buflen -= 8) < 0)
1956                         goto out_resource;
1957                 WRITE64((u64) statfs.f_ffree);
1958         }
1959         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1960                 if ((buflen -= 8) < 0)
1961                         goto out_resource;
1962                 WRITE64((u64) statfs.f_ffree);
1963         }
1964         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1965                 if ((buflen -= 8) < 0)
1966                         goto out_resource;
1967                 WRITE64((u64) statfs.f_files);
1968         }
1969         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1970                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1971                 if (status == nfserr_resource)
1972                         goto out_resource;
1973                 if (status)
1974                         goto out;
1975         }
1976         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1977                 if ((buflen -= 4) < 0)
1978                         goto out_resource;
1979                 WRITE32(1);
1980         }
1981         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1982                 if ((buflen -= 8) < 0)
1983                         goto out_resource;
1984                 WRITE64(~(u64)0);
1985         }
1986         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1987                 if ((buflen -= 4) < 0)
1988                         goto out_resource;
1989                 WRITE32(255);
1990         }
1991         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1992                 if ((buflen -= 4) < 0)
1993                         goto out_resource;
1994                 WRITE32(statfs.f_namelen);
1995         }
1996         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1997                 if ((buflen -= 8) < 0)
1998                         goto out_resource;
1999                 WRITE64((u64) svc_max_payload(rqstp));
2000         }
2001         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2002                 if ((buflen -= 8) < 0)
2003                         goto out_resource;
2004                 WRITE64((u64) svc_max_payload(rqstp));
2005         }
2006         if (bmval1 & FATTR4_WORD1_MODE) {
2007                 if ((buflen -= 4) < 0)
2008                         goto out_resource;
2009                 WRITE32(stat.mode & S_IALLUGO);
2010         }
2011         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2012                 if ((buflen -= 4) < 0)
2013                         goto out_resource;
2014                 WRITE32(1);
2015         }
2016         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2017                 if ((buflen -= 4) < 0)
2018                         goto out_resource;
2019                 WRITE32(stat.nlink);
2020         }
2021         if (bmval1 & FATTR4_WORD1_OWNER) {
2022                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2023                 if (status == nfserr_resource)
2024                         goto out_resource;
2025                 if (status)
2026                         goto out;
2027         }
2028         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2029                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2030                 if (status == nfserr_resource)
2031                         goto out_resource;
2032                 if (status)
2033                         goto out;
2034         }
2035         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2036                 if ((buflen -= 8) < 0)
2037                         goto out_resource;
2038                 WRITE32((u32) MAJOR(stat.rdev));
2039                 WRITE32((u32) MINOR(stat.rdev));
2040         }
2041         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2042                 if ((buflen -= 8) < 0)
2043                         goto out_resource;
2044                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2045                 WRITE64(dummy64);
2046         }
2047         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2048                 if ((buflen -= 8) < 0)
2049                         goto out_resource;
2050                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2051                 WRITE64(dummy64);
2052         }
2053         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2054                 if ((buflen -= 8) < 0)
2055                         goto out_resource;
2056                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2057                 WRITE64(dummy64);
2058         }
2059         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2060                 if ((buflen -= 8) < 0)
2061                         goto out_resource;
2062                 dummy64 = (u64)stat.blocks << 9;
2063                 WRITE64(dummy64);
2064         }
2065         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2066                 if ((buflen -= 12) < 0)
2067                         goto out_resource;
2068                 WRITE32(0);
2069                 WRITE32(stat.atime.tv_sec);
2070                 WRITE32(stat.atime.tv_nsec);
2071         }
2072         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2073                 if ((buflen -= 12) < 0)
2074                         goto out_resource;
2075                 WRITE32(0);
2076                 WRITE32(1);
2077                 WRITE32(0);
2078         }
2079         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2080                 if ((buflen -= 12) < 0)
2081                         goto out_resource;
2082                 WRITE32(0);
2083                 WRITE32(stat.ctime.tv_sec);
2084                 WRITE32(stat.ctime.tv_nsec);
2085         }
2086         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2087                 if ((buflen -= 12) < 0)
2088                         goto out_resource;
2089                 WRITE32(0);
2090                 WRITE32(stat.mtime.tv_sec);
2091                 WRITE32(stat.mtime.tv_nsec);
2092         }
2093         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2094                 if ((buflen -= 8) < 0)
2095                         goto out_resource;
2096                 /*
2097                  * Get parent's attributes if not ignoring crossmount
2098                  * and this is the root of a cross-mounted filesystem.
2099                  */
2100                 if (ignore_crossmnt == 0 &&
2101                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
2102                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
2103                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
2104                         if (err)
2105                                 goto out_nfserr;
2106                 }
2107                 WRITE64(stat.ino);
2108         }
2109         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2110         *countp = p - buffer;
2111         status = nfs_ok;
2112
2113 out:
2114         kfree(acl);
2115         if (fhp == &tempfh)
2116                 fh_put(&tempfh);
2117         return status;
2118 out_nfserr:
2119         status = nfserrno(err);
2120         goto out;
2121 out_resource:
2122         *countp = 0;
2123         status = nfserr_resource;
2124         goto out;
2125 out_serverfault:
2126         status = nfserr_serverfault;
2127         goto out;
2128 }
2129
2130 static inline int attributes_need_mount(u32 *bmval)
2131 {
2132         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2133                 return 1;
2134         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2135                 return 1;
2136         return 0;
2137 }
2138
2139 static __be32
2140 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2141                 const char *name, int namlen, __be32 *p, int *buflen)
2142 {
2143         struct svc_export *exp = cd->rd_fhp->fh_export;
2144         struct dentry *dentry;
2145         __be32 nfserr;
2146         int ignore_crossmnt = 0;
2147
2148         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2149         if (IS_ERR(dentry))
2150                 return nfserrno(PTR_ERR(dentry));
2151
2152         exp_get(exp);
2153         /*
2154          * In the case of a mountpoint, the client may be asking for
2155          * attributes that are only properties of the underlying filesystem
2156          * as opposed to the cross-mounted file system. In such a case,
2157          * we will not follow the cross mount and will fill the attribtutes
2158          * directly from the mountpoint dentry.
2159          */
2160         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
2161                 ignore_crossmnt = 1;
2162         else if (d_mountpoint(dentry)) {
2163                 int err;
2164
2165                 /*
2166                  * Why the heck aren't we just using nfsd_lookup??
2167                  * Different "."/".." handling?  Something else?
2168                  * At least, add a comment here to explain....
2169                  */
2170                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2171                 if (err) {
2172                         nfserr = nfserrno(err);
2173                         goto out_put;
2174                 }
2175                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2176                 if (nfserr)
2177                         goto out_put;
2178
2179         }
2180         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2181                                         cd->rd_rqstp, ignore_crossmnt);
2182 out_put:
2183         dput(dentry);
2184         exp_put(exp);
2185         return nfserr;
2186 }
2187
2188 static __be32 *
2189 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2190 {
2191         __be32 *attrlenp;
2192
2193         if (buflen < 6)
2194                 return NULL;
2195         *p++ = htonl(2);
2196         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2197         *p++ = htonl(0);                         /* bmval1 */
2198
2199         attrlenp = p++;
2200         *p++ = nfserr;       /* no htonl */
2201         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2202         return p;
2203 }
2204
2205 static int
2206 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2207                     loff_t offset, u64 ino, unsigned int d_type)
2208 {
2209         struct readdir_cd *ccd = ccdv;
2210         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2211         int buflen;
2212         __be32 *p = cd->buffer;
2213         __be32 nfserr = nfserr_toosmall;
2214
2215         /* In nfsv4, "." and ".." never make it onto the wire.. */
2216         if (name && isdotent(name, namlen)) {
2217                 cd->common.err = nfs_ok;
2218                 return 0;
2219         }
2220
2221         if (cd->offset)
2222                 xdr_encode_hyper(cd->offset, (u64) offset);
2223
2224         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2225         if (buflen < 0)
2226                 goto fail;
2227
2228         *p++ = xdr_one;                             /* mark entry present */
2229         cd->offset = p;                             /* remember pointer */
2230         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2231         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2232
2233         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2234         switch (nfserr) {
2235         case nfs_ok:
2236                 p += buflen;
2237                 break;
2238         case nfserr_resource:
2239                 nfserr = nfserr_toosmall;
2240                 goto fail;
2241         case nfserr_dropit:
2242                 goto fail;
2243         default:
2244                 /*
2245                  * If the client requested the RDATTR_ERROR attribute,
2246                  * we stuff the error code into this attribute
2247                  * and continue.  If this attribute was not requested,
2248                  * then in accordance with the spec, we fail the
2249                  * entire READDIR operation(!)
2250                  */
2251                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2252                         goto fail;
2253                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2254                 if (p == NULL) {
2255                         nfserr = nfserr_toosmall;
2256                         goto fail;
2257                 }
2258         }
2259         cd->buflen -= (p - cd->buffer);
2260         cd->buffer = p;
2261         cd->common.err = nfs_ok;
2262         return 0;
2263 fail:
2264         cd->common.err = nfserr;
2265         return -EINVAL;
2266 }
2267
2268 static void
2269 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2270 {
2271         ENCODE_HEAD;
2272
2273         RESERVE_SPACE(sizeof(stateid_t));
2274         WRITE32(sid->si_generation);
2275         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2276         ADJUST_ARGS();
2277 }
2278
2279 static __be32
2280 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2281 {
2282         ENCODE_HEAD;
2283
2284         if (!nfserr) {
2285                 RESERVE_SPACE(8);
2286                 WRITE32(access->ac_supported);
2287                 WRITE32(access->ac_resp_access);
2288                 ADJUST_ARGS();
2289         }
2290         return nfserr;
2291 }
2292
2293 static __be32
2294 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2295 {
2296         ENCODE_SEQID_OP_HEAD;
2297
2298         if (!nfserr)
2299                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2300
2301         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2302         return nfserr;
2303 }
2304
2305
2306 static __be32
2307 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2308 {
2309         ENCODE_HEAD;
2310
2311         if (!nfserr) {
2312                 RESERVE_SPACE(8);
2313                 WRITEMEM(commit->co_verf.data, 8);
2314                 ADJUST_ARGS();
2315         }
2316         return nfserr;
2317 }
2318
2319 static __be32
2320 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2321 {
2322         ENCODE_HEAD;
2323
2324         if (!nfserr) {
2325                 RESERVE_SPACE(32);
2326                 WRITECINFO(create->cr_cinfo);
2327                 WRITE32(2);
2328                 WRITE32(create->cr_bmval[0]);
2329                 WRITE32(create->cr_bmval[1]);
2330                 ADJUST_ARGS();
2331         }
2332         return nfserr;
2333 }
2334
2335 static __be32
2336 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2337 {
2338         struct svc_fh *fhp = getattr->ga_fhp;
2339         int buflen;
2340
2341         if (nfserr)
2342                 return nfserr;
2343
2344         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2345         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2346                                     resp->p, &buflen, getattr->ga_bmval,
2347                                     resp->rqstp, 0);
2348         if (!nfserr)
2349                 resp->p += buflen;
2350         return nfserr;
2351 }
2352
2353 static __be32
2354 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2355 {
2356         struct svc_fh *fhp = *fhpp;
2357         unsigned int len;
2358         ENCODE_HEAD;
2359
2360         if (!nfserr) {
2361                 len = fhp->fh_handle.fh_size;
2362                 RESERVE_SPACE(len + 4);
2363                 WRITE32(len);
2364                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2365                 ADJUST_ARGS();
2366         }
2367         return nfserr;
2368 }
2369
2370 /*
2371 * Including all fields other than the name, a LOCK4denied structure requires
2372 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2373 */
2374 static void
2375 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2376 {
2377         ENCODE_HEAD;
2378
2379         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2380         WRITE64(ld->ld_start);
2381         WRITE64(ld->ld_length);
2382         WRITE32(ld->ld_type);
2383         if (ld->ld_sop) {
2384                 WRITEMEM(&ld->ld_clientid, 8);
2385                 WRITE32(ld->ld_sop->so_owner.len);
2386                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2387                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2388         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2389                 WRITE64((u64)0); /* clientid */
2390                 WRITE32(0); /* length of owner name */
2391         }
2392         ADJUST_ARGS();
2393 }
2394
2395 static __be32
2396 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2397 {
2398         ENCODE_SEQID_OP_HEAD;
2399
2400         if (!nfserr)
2401                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2402         else if (nfserr == nfserr_denied)
2403                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2404
2405         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2406         return nfserr;
2407 }
2408
2409 static __be32
2410 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2411 {
2412         if (nfserr == nfserr_denied)
2413                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2414         return nfserr;
2415 }
2416
2417 static __be32
2418 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2419 {
2420         ENCODE_SEQID_OP_HEAD;
2421
2422         if (!nfserr)
2423                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2424
2425         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2426         return nfserr;
2427 }
2428
2429
2430 static __be32
2431 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2432 {
2433         ENCODE_HEAD;
2434
2435         if (!nfserr) {
2436                 RESERVE_SPACE(20);
2437                 WRITECINFO(link->li_cinfo);
2438                 ADJUST_ARGS();
2439         }
2440         return nfserr;
2441 }
2442
2443
2444 static __be32
2445 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2446 {
2447         ENCODE_HEAD;
2448         ENCODE_SEQID_OP_HEAD;
2449
2450         if (nfserr)
2451                 goto out;
2452
2453         nfsd4_encode_stateid(resp, &open->op_stateid);
2454         RESERVE_SPACE(40);
2455         WRITECINFO(open->op_cinfo);
2456         WRITE32(open->op_rflags);
2457         WRITE32(2);
2458         WRITE32(open->op_bmval[0]);
2459         WRITE32(open->op_bmval[1]);
2460         WRITE32(open->op_delegate_type);
2461         ADJUST_ARGS();
2462
2463         switch (open->op_delegate_type) {
2464         case NFS4_OPEN_DELEGATE_NONE:
2465                 break;
2466         case NFS4_OPEN_DELEGATE_READ:
2467                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2468                 RESERVE_SPACE(20);
2469                 WRITE32(open->op_recall);
2470
2471                 /*
2472                  * TODO: ACE's in delegations
2473                  */
2474                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2475                 WRITE32(0);
2476                 WRITE32(0);
2477                 WRITE32(0);   /* XXX: is NULL principal ok? */
2478                 ADJUST_ARGS();
2479                 break;
2480         case NFS4_OPEN_DELEGATE_WRITE:
2481                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2482                 RESERVE_SPACE(32);
2483                 WRITE32(0);
2484
2485                 /*
2486                  * TODO: space_limit's in delegations
2487                  */
2488                 WRITE32(NFS4_LIMIT_SIZE);
2489                 WRITE32(~(u32)0);
2490                 WRITE32(~(u32)0);
2491
2492                 /*
2493                  * TODO: ACE's in delegations
2494                  */
2495                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2496                 WRITE32(0);
2497                 WRITE32(0);
2498                 WRITE32(0);   /* XXX: is NULL principal ok? */
2499                 ADJUST_ARGS();
2500                 break;
2501         default:
2502                 BUG();
2503         }
2504         /* XXX save filehandle here */
2505 out:
2506         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2507         return nfserr;
2508 }
2509
2510 static __be32
2511 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2512 {
2513         ENCODE_SEQID_OP_HEAD;
2514
2515         if (!nfserr)
2516                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2517
2518         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2519         return nfserr;
2520 }
2521
2522 static __be32
2523 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2524 {
2525         ENCODE_SEQID_OP_HEAD;
2526
2527         if (!nfserr)
2528                 nfsd4_encode_stateid(resp, &od->od_stateid);
2529
2530         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2531         return nfserr;
2532 }
2533
2534 static __be32
2535 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2536                   struct nfsd4_read *read)
2537 {
2538         u32 eof;
2539         int v, pn;
2540         unsigned long maxcount;
2541         long len;
2542         ENCODE_HEAD;
2543
2544         if (nfserr)
2545                 return nfserr;
2546         if (resp->xbuf->page_len)
2547                 return nfserr_resource;
2548
2549         RESERVE_SPACE(8); /* eof flag and byte count */
2550
2551         maxcount = svc_max_payload(resp->rqstp);
2552         if (maxcount > read->rd_length)
2553                 maxcount = read->rd_length;
2554
2555         len = maxcount;
2556         v = 0;
2557         while (len > 0) {
2558                 pn = resp->rqstp->rq_resused++;
2559                 resp->rqstp->rq_vec[v].iov_base =
2560                         page_address(resp->rqstp->rq_respages[pn]);
2561                 resp->rqstp->rq_vec[v].iov_len =
2562                         len < PAGE_SIZE ? len : PAGE_SIZE;
2563                 v++;
2564                 len -= PAGE_SIZE;
2565         }
2566         read->rd_vlen = v;
2567
2568         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2569                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2570                         &maxcount);
2571
2572         if (nfserr == nfserr_symlink)
2573                 nfserr = nfserr_inval;
2574         if (nfserr)
2575                 return nfserr;
2576         eof = (read->rd_offset + maxcount >=
2577                read->rd_fhp->fh_dentry->d_inode->i_size);
2578
2579         WRITE32(eof);
2580         WRITE32(maxcount);
2581         ADJUST_ARGS();
2582         resp->xbuf->head[0].iov_len = (char*)p
2583                                         - (char*)resp->xbuf->head[0].iov_base;
2584         resp->xbuf->page_len = maxcount;
2585
2586         /* Use rest of head for padding and remaining ops: */
2587         resp->xbuf->tail[0].iov_base = p;
2588         resp->xbuf->tail[0].iov_len = 0;
2589         if (maxcount&3) {
2590                 RESERVE_SPACE(4);
2591                 WRITE32(0);
2592                 resp->xbuf->tail[0].iov_base += maxcount&3;
2593                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2594                 ADJUST_ARGS();
2595         }
2596         return 0;
2597 }
2598
2599 static __be32
2600 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2601 {
2602         int maxcount;
2603         char *page;
2604         ENCODE_HEAD;
2605
2606         if (nfserr)
2607                 return nfserr;
2608         if (resp->xbuf->page_len)
2609                 return nfserr_resource;
2610
2611         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2612
2613         maxcount = PAGE_SIZE;
2614         RESERVE_SPACE(4);
2615
2616         /*
2617          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2618          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2619          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2620          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2621          */
2622         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2623         if (nfserr == nfserr_isdir)
2624                 return nfserr_inval;
2625         if (nfserr)
2626                 return nfserr;
2627
2628         WRITE32(maxcount);
2629         ADJUST_ARGS();
2630         resp->xbuf->head[0].iov_len = (char*)p
2631                                 - (char*)resp->xbuf->head[0].iov_base;
2632         resp->xbuf->page_len = maxcount;
2633
2634         /* Use rest of head for padding and remaining ops: */
2635         resp->xbuf->tail[0].iov_base = p;
2636         resp->xbuf->tail[0].iov_len = 0;
2637         if (maxcount&3) {
2638                 RESERVE_SPACE(4);
2639                 WRITE32(0);
2640                 resp->xbuf->tail[0].iov_base += maxcount&3;
2641                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2642                 ADJUST_ARGS();
2643         }
2644         return 0;
2645 }
2646
2647 static __be32
2648 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2649 {
2650         int maxcount;
2651         loff_t offset;
2652         __be32 *page, *savep, *tailbase;
2653         ENCODE_HEAD;
2654
2655         if (nfserr)
2656                 return nfserr;
2657         if (resp->xbuf->page_len)
2658                 return nfserr_resource;
2659
2660         RESERVE_SPACE(8);  /* verifier */
2661         savep = p;
2662
2663         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2664         WRITE32(0);
2665         WRITE32(0);
2666         ADJUST_ARGS();
2667         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2668         tailbase = p;
2669
2670         maxcount = PAGE_SIZE;
2671         if (maxcount > readdir->rd_maxcount)
2672                 maxcount = readdir->rd_maxcount;
2673
2674         /*
2675          * Convert from bytes to words, account for the two words already
2676          * written, make sure to leave two words at the end for the next
2677          * pointer and eof field.
2678          */
2679         maxcount = (maxcount >> 2) - 4;
2680         if (maxcount < 0) {
2681                 nfserr =  nfserr_toosmall;
2682                 goto err_no_verf;
2683         }
2684
2685         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2686         readdir->common.err = 0;
2687         readdir->buflen = maxcount;
2688         readdir->buffer = page;
2689         readdir->offset = NULL;
2690
2691         offset = readdir->rd_cookie;
2692         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2693                               &offset,
2694                               &readdir->common, nfsd4_encode_dirent);
2695         if (nfserr == nfs_ok &&
2696             readdir->common.err == nfserr_toosmall &&
2697             readdir->buffer == page)
2698                 nfserr = nfserr_toosmall;
2699         if (nfserr == nfserr_symlink)
2700                 nfserr = nfserr_notdir;
2701         if (nfserr)
2702                 goto err_no_verf;
2703
2704         if (readdir->offset)
2705                 xdr_encode_hyper(readdir->offset, offset);
2706
2707         p = readdir->buffer;
2708         *p++ = 0;       /* no more entries */
2709         *p++ = htonl(readdir->common.err == nfserr_eof);
2710         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2711                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2712
2713         /* Use rest of head for padding and remaining ops: */
2714         resp->xbuf->tail[0].iov_base = tailbase;
2715         resp->xbuf->tail[0].iov_len = 0;
2716         resp->p = resp->xbuf->tail[0].iov_base;
2717         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2718
2719         return 0;
2720 err_no_verf:
2721         p = savep;
2722         ADJUST_ARGS();
2723         return nfserr;
2724 }
2725
2726 static __be32
2727 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2728 {
2729         ENCODE_HEAD;
2730
2731         if (!nfserr) {
2732                 RESERVE_SPACE(20);
2733                 WRITECINFO(remove->rm_cinfo);
2734                 ADJUST_ARGS();
2735         }
2736         return nfserr;
2737 }
2738
2739 static __be32
2740 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2741 {
2742         ENCODE_HEAD;
2743
2744         if (!nfserr) {
2745                 RESERVE_SPACE(40);
2746                 WRITECINFO(rename->rn_sinfo);
2747                 WRITECINFO(rename->rn_tinfo);
2748                 ADJUST_ARGS();
2749         }
2750         return nfserr;
2751 }
2752
2753 static __be32
2754 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2755                      struct nfsd4_secinfo *secinfo)
2756 {
2757         int i = 0;
2758         struct svc_export *exp = secinfo->si_exp;
2759         u32 nflavs;
2760         struct exp_flavor_info *flavs;
2761         struct exp_flavor_info def_flavs[2];
2762         ENCODE_HEAD;
2763
2764         if (nfserr)
2765                 goto out;
2766         if (exp->ex_nflavors) {
2767                 flavs = exp->ex_flavors;
2768                 nflavs = exp->ex_nflavors;
2769         } else { /* Handling of some defaults in absence of real secinfo: */
2770                 flavs = def_flavs;
2771                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2772                         nflavs = 2;
2773                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2774                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2775                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2776                         nflavs = 1;
2777                         flavs[0].pseudoflavor
2778                                         = svcauth_gss_flavor(exp->ex_client);
2779                 } else {
2780                         nflavs = 1;
2781                         flavs[0].pseudoflavor
2782                                         = exp->ex_client->flavour->flavour;
2783                 }
2784         }
2785
2786         RESERVE_SPACE(4);
2787         WRITE32(nflavs);
2788         ADJUST_ARGS();
2789         for (i = 0; i < nflavs; i++) {
2790                 u32 flav = flavs[i].pseudoflavor;
2791                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2792
2793                 if (gm) {
2794                         RESERVE_SPACE(4);
2795                         WRITE32(RPC_AUTH_GSS);
2796                         ADJUST_ARGS();
2797                         RESERVE_SPACE(4 + gm->gm_oid.len);
2798                         WRITE32(gm->gm_oid.len);
2799                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2800                         ADJUST_ARGS();
2801                         RESERVE_SPACE(4);
2802                         WRITE32(0); /* qop */
2803                         ADJUST_ARGS();
2804                         RESERVE_SPACE(4);
2805                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2806                         ADJUST_ARGS();
2807                         gss_mech_put(gm);
2808                 } else {
2809                         RESERVE_SPACE(4);
2810                         WRITE32(flav);
2811                         ADJUST_ARGS();
2812                 }
2813         }
2814 out:
2815         if (exp)
2816                 exp_put(exp);
2817         return nfserr;
2818 }
2819
2820 /*
2821  * The SETATTR encode routine is special -- it always encodes a bitmap,
2822  * regardless of the error status.
2823  */
2824 static __be32
2825 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2826 {
2827         ENCODE_HEAD;
2828
2829         RESERVE_SPACE(12);
2830         if (nfserr) {
2831                 WRITE32(2);
2832                 WRITE32(0);
2833                 WRITE32(0);
2834         }
2835         else {
2836                 WRITE32(2);
2837                 WRITE32(setattr->sa_bmval[0]);
2838                 WRITE32(setattr->sa_bmval[1]);
2839         }
2840         ADJUST_ARGS();
2841         return nfserr;
2842 }
2843
2844 static __be32
2845 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2846 {
2847         ENCODE_HEAD;
2848
2849         if (!nfserr) {
2850                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2851                 WRITEMEM(&scd->se_clientid, 8);
2852                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2853                 ADJUST_ARGS();
2854         }
2855         else if (nfserr == nfserr_clid_inuse) {
2856                 RESERVE_SPACE(8);
2857                 WRITE32(0);
2858                 WRITE32(0);
2859                 ADJUST_ARGS();
2860         }
2861         return nfserr;
2862 }
2863
2864 static __be32
2865 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2866 {
2867         ENCODE_HEAD;
2868
2869         if (!nfserr) {
2870                 RESERVE_SPACE(16);
2871                 WRITE32(write->wr_bytes_written);
2872                 WRITE32(write->wr_how_written);
2873                 WRITEMEM(write->wr_verifier.data, 8);
2874                 ADJUST_ARGS();
2875         }
2876         return nfserr;
2877 }
2878
2879 static __be32
2880 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2881                          struct nfsd4_exchange_id *exid)
2882 {
2883         ENCODE_HEAD;
2884         char *major_id;
2885         char *server_scope;
2886         int major_id_sz;
2887         int server_scope_sz;
2888         uint64_t minor_id = 0;
2889
2890         if (nfserr)
2891                 return nfserr;
2892
2893         major_id = utsname()->nodename;
2894         major_id_sz = strlen(major_id);
2895         server_scope = utsname()->nodename;
2896         server_scope_sz = strlen(server_scope);
2897
2898         RESERVE_SPACE(
2899                 8 /* eir_clientid */ +
2900                 4 /* eir_sequenceid */ +
2901                 4 /* eir_flags */ +
2902                 4 /* spr_how (SP4_NONE) */ +
2903                 8 /* so_minor_id */ +
2904                 4 /* so_major_id.len */ +
2905                 (XDR_QUADLEN(major_id_sz) * 4) +
2906                 4 /* eir_server_scope.len */ +
2907                 (XDR_QUADLEN(server_scope_sz) * 4) +
2908                 4 /* eir_server_impl_id.count (0) */);
2909
2910         WRITEMEM(&exid->clientid, 8);
2911         WRITE32(exid->seqid);
2912         WRITE32(exid->flags);
2913
2914         /* state_protect4_r. Currently only support SP4_NONE */
2915         BUG_ON(exid->spa_how != SP4_NONE);
2916         WRITE32(exid->spa_how);
2917
2918         /* The server_owner struct */
2919         WRITE64(minor_id);      /* Minor id */
2920         /* major id */
2921         WRITE32(major_id_sz);
2922         WRITEMEM(major_id, major_id_sz);
2923
2924         /* Server scope */
2925         WRITE32(server_scope_sz);
2926         WRITEMEM(server_scope, server_scope_sz);
2927
2928         /* Implementation id */
2929         WRITE32(0);     /* zero length nfs_impl_id4 array */
2930         ADJUST_ARGS();
2931         return 0;
2932 }
2933
2934 static __be32
2935 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
2936                             struct nfsd4_create_session *sess)
2937 {
2938         ENCODE_HEAD;
2939
2940         if (nfserr)
2941                 return nfserr;
2942
2943         RESERVE_SPACE(24);
2944         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2945         WRITE32(sess->seqid);
2946         WRITE32(sess->flags);
2947         ADJUST_ARGS();
2948
2949         RESERVE_SPACE(28);
2950         WRITE32(0); /* headerpadsz */
2951         WRITE32(sess->fore_channel.maxreq_sz);
2952         WRITE32(sess->fore_channel.maxresp_sz);
2953         WRITE32(sess->fore_channel.maxresp_cached);
2954         WRITE32(sess->fore_channel.maxops);
2955         WRITE32(sess->fore_channel.maxreqs);
2956         WRITE32(sess->fore_channel.nr_rdma_attrs);
2957         ADJUST_ARGS();
2958
2959         if (sess->fore_channel.nr_rdma_attrs) {
2960                 RESERVE_SPACE(4);
2961                 WRITE32(sess->fore_channel.rdma_attrs);
2962                 ADJUST_ARGS();
2963         }
2964
2965         RESERVE_SPACE(28);
2966         WRITE32(0); /* headerpadsz */
2967         WRITE32(sess->back_channel.maxreq_sz);
2968         WRITE32(sess->back_channel.maxresp_sz);
2969         WRITE32(sess->back_channel.maxresp_cached);
2970         WRITE32(sess->back_channel.maxops);
2971         WRITE32(sess->back_channel.maxreqs);
2972         WRITE32(sess->back_channel.nr_rdma_attrs);
2973         ADJUST_ARGS();
2974
2975         if (sess->back_channel.nr_rdma_attrs) {
2976                 RESERVE_SPACE(4);
2977                 WRITE32(sess->back_channel.rdma_attrs);
2978                 ADJUST_ARGS();
2979         }
2980         return 0;
2981 }
2982
2983 static __be32
2984 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
2985                              struct nfsd4_destroy_session *destroy_session)
2986 {
2987         return nfserr;
2988 }
2989
2990 __be32
2991 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
2992                       struct nfsd4_sequence *seq)
2993 {
2994         ENCODE_HEAD;
2995
2996         if (nfserr)
2997                 return nfserr;
2998
2999         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3000         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3001         WRITE32(seq->seqid);
3002         WRITE32(seq->slotid);
3003         WRITE32(seq->maxslots);
3004         /*
3005          * FIXME: for now:
3006          *   target_maxslots = maxslots
3007          *   status_flags = 0
3008          */
3009         WRITE32(seq->maxslots);
3010         WRITE32(0);
3011
3012         ADJUST_ARGS();
3013         return 0;
3014 }
3015
3016 static __be32
3017 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3018 {
3019         return nfserr;
3020 }
3021
3022 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3023
3024 /*
3025  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3026  * since we don't need to filter out obsolete ops as this is
3027  * done in the decoding phase.
3028  */
3029 static nfsd4_enc nfsd4_enc_ops[] = {
3030         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3031         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3032         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3033         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3034         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3035         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3036         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3037         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3038         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3039         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3040         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3041         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3042         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3043         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3044         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3045         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3046         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3047         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3048         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3049         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3050         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3051         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3052         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3053         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3054         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3055         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3056         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3057         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3058         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3059         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3060         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3061         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3062         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3063         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3064         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3065         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3066         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3067
3068         /* NFSv4.1 operations */
3069         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3070         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3071         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3072         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3073         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3074         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3075         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3076         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3077         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3078         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3079         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3080         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3081         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
3082         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3083         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3084         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3085         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3086         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3087         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3088 };
3089
3090 /*
3091  * Calculate the total amount of memory that the compound response has taken
3092  * after encoding the current operation.
3093  *
3094  * pad: add on 8 bytes for the next operation's op_code and status so that
3095  * there is room to cache a failure on the next operation.
3096  *
3097  * Compare this length to the session se_fmaxresp_cached.
3098  *
3099  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3100  * will be at least a page and will therefore hold the xdr_buf head.
3101  */
3102 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3103 {
3104         int status = 0;
3105         struct xdr_buf *xb = &resp->rqstp->rq_res;
3106         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3107         struct nfsd4_session *session = NULL;
3108         struct nfsd4_slot *slot = resp->cstate.slot;
3109         u32 length, tlen = 0, pad = 8;
3110
3111         if (!nfsd4_has_session(&resp->cstate))
3112                 return status;
3113
3114         session = resp->cstate.session;
3115         if (session == NULL || slot->sl_cache_entry.ce_cachethis == 0)
3116                 return status;
3117
3118         if (resp->opcnt >= args->opcnt)
3119                 pad = 0; /* this is the last operation */
3120
3121         if (xb->page_len == 0) {
3122                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3123         } else {
3124                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3125                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3126
3127                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3128         }
3129         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3130                 length, xb->page_len, tlen, pad);
3131
3132         if (length <= session->se_fmaxresp_cached)
3133                 return status;
3134         else
3135                 return nfserr_rep_too_big_to_cache;
3136 }
3137
3138 void
3139 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3140 {
3141         __be32 *statp;
3142         ENCODE_HEAD;
3143
3144         RESERVE_SPACE(8);
3145         WRITE32(op->opnum);
3146         statp = p++;    /* to be backfilled at the end */
3147         ADJUST_ARGS();
3148
3149         if (op->opnum == OP_ILLEGAL)
3150                 goto status;
3151         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3152                !nfsd4_enc_ops[op->opnum]);
3153         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3154         /* nfsd4_check_drc_limit guarantees enough room for error status */
3155         if (!op->status && nfsd4_check_drc_limit(resp))
3156                 op->status = nfserr_rep_too_big_to_cache;
3157 status:
3158         /*
3159          * Note: We write the status directly, instead of using WRITE32(),
3160          * since it is already in network byte order.
3161          */
3162         *statp = op->status;
3163 }
3164
3165 /*
3166  * Encode the reply stored in the stateowner reply cache
3167  *
3168  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3169  * previously sent already encoded operation.
3170  *
3171  * called with nfs4_lock_state() held
3172  */
3173 void
3174 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3175 {
3176         ENCODE_HEAD;
3177         struct nfs4_replay *rp = op->replay;
3178
3179         BUG_ON(!rp);
3180
3181         RESERVE_SPACE(8);
3182         WRITE32(op->opnum);
3183         *p++ = rp->rp_status;  /* already xdr'ed */
3184         ADJUST_ARGS();
3185
3186         RESERVE_SPACE(rp->rp_buflen);
3187         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3188         ADJUST_ARGS();
3189 }
3190
3191 /*
3192  * END OF "GENERIC" ENCODE ROUTINES.
3193  */
3194
3195 int
3196 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3197 {
3198         return xdr_ressize_check(rqstp, p);
3199 }
3200
3201 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3202 {
3203         if (args->ops != args->iops) {
3204                 kfree(args->ops);
3205                 args->ops = args->iops;
3206         }
3207         kfree(args->tmpp);
3208         args->tmpp = NULL;
3209         while (args->to_free) {
3210                 struct tmpbuf *tb = args->to_free;
3211                 args->to_free = tb->next;
3212                 tb->release(tb->buf);
3213                 kfree(tb);
3214         }
3215 }
3216
3217 int
3218 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3219 {
3220         __be32 status;
3221
3222         args->p = p;
3223         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3224         args->pagelist = rqstp->rq_arg.pages;
3225         args->pagelen = rqstp->rq_arg.page_len;
3226         args->tmpp = NULL;
3227         args->to_free = NULL;
3228         args->ops = args->iops;
3229         args->rqstp = rqstp;
3230
3231         status = nfsd4_decode_compound(args);
3232         if (status) {
3233                 nfsd4_release_compoundargs(args);
3234         }
3235         return !status;
3236 }
3237
3238 int
3239 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3240 {
3241         /*
3242          * All that remains is to write the tag and operation count...
3243          */
3244         struct kvec *iov;
3245         p = resp->tagp;
3246         *p++ = htonl(resp->taglen);
3247         memcpy(p, resp->tag, resp->taglen);
3248         p += XDR_QUADLEN(resp->taglen);
3249         *p++ = htonl(resp->opcnt);
3250
3251         if (rqstp->rq_res.page_len)
3252                 iov = &rqstp->rq_res.tail[0];
3253         else
3254                 iov = &rqstp->rq_res.head[0];
3255         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3256         BUG_ON(iov->iov_len > PAGE_SIZE);
3257         if (nfsd4_has_session(&resp->cstate)) {
3258                 if (resp->cstate.status == nfserr_replay_cache &&
3259                                 !nfsd4_not_cached(resp)) {
3260                         iov->iov_len = resp->cstate.iovlen;
3261                 } else {
3262                         nfsd4_store_cache_entry(resp);
3263                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3264                         resp->cstate.slot->sl_inuse = 0;
3265                 }
3266                 if (resp->cstate.session)
3267                         nfsd4_put_session(resp->cstate.session);
3268         }
3269         return 1;
3270 }
3271
3272 /*
3273  * Local variables:
3274  *  c-basic-offset: 8
3275  * End:
3276  */