SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/nfsd/nfs4xdr.c

   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/namei.h>
  44 #include <linux/statfs.h>
  45 #include <linux/utsname.h>
  46 #include <linux/nfsd/xdr4.h>
  47 #include <linux/nfsd_idmap.h>
  48 #include <linux/nfs4_acl.h>
  49 #include <linux/sunrpc/svcauth_gss.h>
  50 #include "vfs.h"
  51
  52 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  53
  54 /*
  55  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  56  * directory in order to indicate to the client that a filesystem boundary is present
  57  * We use a fixed fsid for a referral
  58  */
  59 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  60 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  61
  62 static __be32
  63 check_filename(char *str, int len, __be32 err)
  64 {
  65         int i;
  66
  67         if (len == 0)
  68                 return nfserr_inval;
  69         if (isdotent(str, len))
  70                 return err;
  71         for (i = 0; i < len; i++)
  72                 if (str[i] == '/')
  73                         return err;
  74         return 0;
  75 }
  76
  77 #define DECODE_HEAD                             \
  78         __be32 *p;                              \
  79         __be32 status
  80 #define DECODE_TAIL                             \
  81         status = 0;                             \
  82 out:                                            \
  83         return status;                          \
  84 xdr_error:                                      \
  85         dprintk("NFSD: xdr error (%s:%d)\n",    \
  86                         __FILE__, __LINE__);    \
  87         status = nfserr_bad_xdr;                \
  88         goto out
  89
  90 #define READ32(x)         (x) = ntohl(*p++)
  91 #define READ64(x)         do {                  \
  92         (x) = (u64)ntohl(*p++) << 32;           \
  93         (x) |= ntohl(*p++);                     \
  94 } while (0)
  95 #define READTIME(x)       do {                  \
  96         p++;                                    \
  97         (x) = ntohl(*p++);                      \
  98         p++;                                    \
  99 } while (0)
 100 #define READMEM(x,nbytes) do {                  \
 101         x = (char *)p;                          \
 102         p += XDR_QUADLEN(nbytes);               \
 103 } while (0)
 104 #define SAVEMEM(x,nbytes) do {                  \
 105         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 106                 savemem(argp, p, nbytes) :      \
 107                 (char *)p)) {                   \
 108                 dprintk("NFSD: xdr error (%s:%d)\n", \
 109                                 __FILE__, __LINE__); \
 110                 goto xdr_error;                 \
 111                 }                               \
 112         p += XDR_QUADLEN(nbytes);               \
 113 } while (0)
 114 #define COPYMEM(x,nbytes) do {                  \
 115         memcpy((x), p, nbytes);                 \
 116         p += XDR_QUADLEN(nbytes);               \
 117 } while (0)
 118
 119 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 120 #define READ_BUF(nbytes)  do {                  \
 121         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 122                 p = argp->p;                    \
 123                 argp->p += XDR_QUADLEN(nbytes); \
 124         } else if (!(p = read_buf(argp, nbytes))) { \
 125                 dprintk("NFSD: xdr error (%s:%d)\n", \
 126                                 __FILE__, __LINE__); \
 127                 goto xdr_error;                 \
 128         }                                       \
 129 } while (0)
 130
 131 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 132 {
 133         /* We want more bytes than seem to be available.
 134          * Maybe we need a new page, maybe we have just run out
 135          */
 136         unsigned int avail = (char *)argp->end - (char *)argp->p;
 137         __be32 *p;
 138         if (avail + argp->pagelen < nbytes)
 139                 return NULL;
 140         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 141                 return NULL;
 142         /* ok, we can do it with the current plus the next page */
 143         if (nbytes <= sizeof(argp->tmp))
 144                 p = argp->tmp;
 145         else {
 146                 kfree(argp->tmpp);
 147                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 148                 if (!p)
 149                         return NULL;
 150
 151         }
 152         /*
 153          * The following memcpy is safe because read_buf is always
 154          * called with nbytes > avail, and the two cases above both
 155          * guarantee p points to at least nbytes bytes.
 156          */
 157         memcpy(p, argp->p, avail);
 158         /* step to next page */
 159         argp->p = page_address(argp->pagelist[0]);
 160         argp->pagelist++;
 161         if (argp->pagelen < PAGE_SIZE) {
 162                 argp->end = p + (argp->pagelen>>2);
 163                 argp->pagelen = 0;
 164         } else {
 165                 argp->end = p + (PAGE_SIZE>>2);
 166                 argp->pagelen -= PAGE_SIZE;
 167         }
 168         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 169         argp->p += XDR_QUADLEN(nbytes - avail);
 170         return p;
 171 }
 172
 173 static int zero_clientid(clientid_t *clid)
 174 {
 175         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 176 }
 177
 178 static int
 179 defer_free(struct nfsd4_compoundargs *argp,
 180                 void (*release)(const void *), void *p)
 181 {
 182         struct tmpbuf *tb;
 183
 184         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 185         if (!tb)
 186                 return -ENOMEM;
 187         tb->buf = p;
 188         tb->release = release;
 189         tb->next = argp->to_free;
 190         argp->to_free = tb;
 191         return 0;
 192 }
 193
 194 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 195 {
 196         if (p == argp->tmp) {
 197                 p = kmalloc(nbytes, GFP_KERNEL);
 198                 if (!p)
 199                         return NULL;
 200                 memcpy(p, argp->tmp, nbytes);
 201         } else {
 202                 BUG_ON(p != argp->tmpp);
 203                 argp->tmpp = NULL;
 204         }
 205         if (defer_free(argp, kfree, p)) {
 206                 kfree(p);
 207                 return NULL;
 208         } else
 209                 return (char *)p;
 210 }
 211
 212 static __be32
 213 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 214 {
 215         u32 bmlen;
 216         DECODE_HEAD;
 217
 218         bmval[0] = 0;
 219         bmval[1] = 0;
 220         bmval[2] = 0;
 221
 222         READ_BUF(4);
 223         READ32(bmlen);
 224         if (bmlen > 1000)
 225                 goto xdr_error;
 226
 227         READ_BUF(bmlen << 2);
 228         if (bmlen > 0)
 229                 READ32(bmval[0]);
 230         if (bmlen > 1)
 231                 READ32(bmval[1]);
 232         if (bmlen > 2)
 233                 READ32(bmval[2]);
 234
 235         DECODE_TAIL;
 236 }
 237
 238 static __be32
 239 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 240                    struct iattr *iattr, struct nfs4_acl **acl)
 241 {
 242         int expected_len, len = 0;
 243         u32 dummy32;
 244         char *buf;
 245         int host_err;
 246
 247         DECODE_HEAD;
 248         iattr->ia_valid = 0;
 249         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 250                 return status;
 251
 252         READ_BUF(4);
 253         READ32(expected_len);
 254
 255         if (bmval[0] & FATTR4_WORD0_SIZE) {
 256                 READ_BUF(8);
 257                 len += 8;
 258                 READ64(iattr->ia_size);
 259                 iattr->ia_valid |= ATTR_SIZE;
 260         }
 261         if (bmval[0] & FATTR4_WORD0_ACL) {
 262                 int nace;
 263                 struct nfs4_ace *ace;
 264
 265                 READ_BUF(4); len += 4;
 266                 READ32(nace);
 267
 268                 if (nace > NFS4_ACL_MAX)
 269                         return nfserr_resource;
 270
 271                 *acl = nfs4_acl_new(nace);
 272                 if (*acl == NULL) {
 273                         host_err = -ENOMEM;
 274                         goto out_nfserr;
 275                 }
 276                 defer_free(argp, kfree, *acl);
 277
 278                 (*acl)->naces = nace;
 279                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 280                         READ_BUF(16); len += 16;
 281                         READ32(ace->type);
 282                         READ32(ace->flag);
 283                         READ32(ace->access_mask);
 284                         READ32(dummy32);
 285                         READ_BUF(dummy32);
 286                         len += XDR_QUADLEN(dummy32) << 2;
 287                         READMEM(buf, dummy32);
 288                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 289                         host_err = 0;
 290                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 291                                 ace->who = 0;
 292                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 293                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 294                                                 buf, dummy32, &ace->who);
 295                         else
 296                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 297                                                 buf, dummy32, &ace->who);
 298                         if (host_err)
 299                                 goto out_nfserr;
 300                 }
 301         } else
 302                 *acl = NULL;
 303         if (bmval[1] & FATTR4_WORD1_MODE) {
 304                 READ_BUF(4);
 305                 len += 4;
 306                 READ32(iattr->ia_mode);
 307                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 308                 iattr->ia_valid |= ATTR_MODE;
 309         }
 310         if (bmval[1] & FATTR4_WORD1_OWNER) {
 311                 READ_BUF(4);
 312                 len += 4;
 313                 READ32(dummy32);
 314                 READ_BUF(dummy32);
 315                 len += (XDR_QUADLEN(dummy32) << 2);
 316                 READMEM(buf, dummy32);
 317                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 318                         goto out_nfserr;
 319                 iattr->ia_valid |= ATTR_UID;
 320         }
 321         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 322                 READ_BUF(4);
 323                 len += 4;
 324                 READ32(dummy32);
 325                 READ_BUF(dummy32);
 326                 len += (XDR_QUADLEN(dummy32) << 2);
 327                 READMEM(buf, dummy32);
 328                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 329                         goto out_nfserr;
 330                 iattr->ia_valid |= ATTR_GID;
 331         }
 332         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 333                 READ_BUF(4);
 334                 len += 4;
 335                 READ32(dummy32);
 336                 switch (dummy32) {
 337                 case NFS4_SET_TO_CLIENT_TIME:
 338                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 339                            all 32 bits of 'nseconds'. */
 340                         READ_BUF(12);
 341                         len += 12;
 342                         READ32(dummy32);
 343                         if (dummy32)
 344                                 return nfserr_inval;
 345                         READ32(iattr->ia_atime.tv_sec);
 346                         READ32(iattr->ia_atime.tv_nsec);
 347                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 348                                 return nfserr_inval;
 349                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 350                         break;
 351                 case NFS4_SET_TO_SERVER_TIME:
 352                         iattr->ia_valid |= ATTR_ATIME;
 353                         break;
 354                 default:
 355                         goto xdr_error;
 356                 }
 357         }
 358         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 359                 READ_BUF(4);
 360                 len += 4;
 361                 READ32(dummy32);
 362                 switch (dummy32) {
 363                 case NFS4_SET_TO_CLIENT_TIME:
 364                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 365                            all 32 bits of 'nseconds'. */
 366                         READ_BUF(12);
 367                         len += 12;
 368                         READ32(dummy32);
 369                         if (dummy32)
 370                                 return nfserr_inval;
 371                         READ32(iattr->ia_mtime.tv_sec);
 372                         READ32(iattr->ia_mtime.tv_nsec);
 373                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 374                                 return nfserr_inval;
 375                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 376                         break;
 377                 case NFS4_SET_TO_SERVER_TIME:
 378                         iattr->ia_valid |= ATTR_MTIME;
 379                         break;
 380                 default:
 381                         goto xdr_error;
 382                 }
 383         }
 384         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 385             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 386             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 387                 READ_BUF(expected_len - len);
 388         else if (len != expected_len)
 389                 goto xdr_error;
 390
 391         DECODE_TAIL;
 392
 393 out_nfserr:
 394         status = nfserrno(host_err);
 395         goto out;
 396 }
 397
 398 static __be32
 399 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 400 {
 401         DECODE_HEAD;
 402
 403         READ_BUF(sizeof(stateid_t));
 404         READ32(sid->si_generation);
 405         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 406
 407         DECODE_TAIL;
 408 }
 409
 410 static __be32
 411 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 412 {
 413         DECODE_HEAD;
 414
 415         READ_BUF(4);
 416         READ32(access->ac_req_access);
 417
 418         DECODE_TAIL;
 419 }
 420
 421 static __be32
 422 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 423 {
 424         DECODE_HEAD;
 425
 426         close->cl_stateowner = NULL;
 427         READ_BUF(4);
 428         READ32(close->cl_seqid);
 429         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 430
 431         DECODE_TAIL;
 432 }
 433
 434
 435 static __be32
 436 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 437 {
 438         DECODE_HEAD;
 439
 440         READ_BUF(12);
 441         READ64(commit->co_offset);
 442         READ32(commit->co_count);
 443
 444         DECODE_TAIL;
 445 }
 446
 447 static __be32
 448 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 449 {
 450         DECODE_HEAD;
 451
 452         READ_BUF(4);
 453         READ32(create->cr_type);
 454         switch (create->cr_type) {
 455         case NF4LNK:
 456                 READ_BUF(4);
 457                 READ32(create->cr_linklen);
 458                 READ_BUF(create->cr_linklen);
 459                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 460                 break;
 461         case NF4BLK:
 462         case NF4CHR:
 463                 READ_BUF(8);
 464                 READ32(create->cr_specdata1);
 465                 READ32(create->cr_specdata2);
 466                 break;
 467         case NF4SOCK:
 468         case NF4FIFO:
 469         case NF4DIR:
 470         default:
 471                 break;
 472         }
 473
 474         READ_BUF(4);
 475         READ32(create->cr_namelen);
 476         READ_BUF(create->cr_namelen);
 477         SAVEMEM(create->cr_name, create->cr_namelen);
 478         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 479                 return status;
 480
 481         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 482                                     &create->cr_acl);
 483         if (status)
 484                 goto out;
 485
 486         DECODE_TAIL;
 487 }
 488
 489 static inline __be32
 490 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 491 {
 492         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 493 }
 494
 495 static inline __be32
 496 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 497 {
 498         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 499 }
 500
 501 static __be32
 502 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 503 {
 504         DECODE_HEAD;
 505
 506         READ_BUF(4);
 507         READ32(link->li_namelen);
 508         READ_BUF(link->li_namelen);
 509         SAVEMEM(link->li_name, link->li_namelen);
 510         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 511                 return status;
 512
 513         DECODE_TAIL;
 514 }
 515
 516 static __be32
 517 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 518 {
 519         DECODE_HEAD;
 520
 521         lock->lk_replay_owner = NULL;
 522         /*
 523         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 524         */
 525         READ_BUF(28);
 526         READ32(lock->lk_type);
 527         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 528                 goto xdr_error;
 529         READ32(lock->lk_reclaim);
 530         READ64(lock->lk_offset);
 531         READ64(lock->lk_length);
 532         READ32(lock->lk_is_new);
 533
 534         if (lock->lk_is_new) {
 535                 READ_BUF(4);
 536                 READ32(lock->lk_new_open_seqid);
 537                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 538                 if (status)
 539                         return status;
 540                 READ_BUF(8 + sizeof(clientid_t));
 541                 READ32(lock->lk_new_lock_seqid);
 542                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 543                 READ32(lock->lk_new_owner.len);
 544                 READ_BUF(lock->lk_new_owner.len);
 545                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 546         } else {
 547                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 548                 if (status)
 549                         return status;
 550                 READ_BUF(4);
 551                 READ32(lock->lk_old_lock_seqid);
 552         }
 553
 554         DECODE_TAIL;
 555 }
 556
 557 static __be32
 558 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 559 {
 560         DECODE_HEAD;
 561
 562         READ_BUF(32);
 563         READ32(lockt->lt_type);
 564         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 565                 goto xdr_error;
 566         READ64(lockt->lt_offset);
 567         READ64(lockt->lt_length);
 568         COPYMEM(&lockt->lt_clientid, 8);
 569         READ32(lockt->lt_owner.len);
 570         READ_BUF(lockt->lt_owner.len);
 571         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 572
 573         if (argp->minorversion && !zero_clientid(&lockt->lt_clientid))
 574                 return nfserr_inval;
 575         DECODE_TAIL;
 576 }
 577
 578 static __be32
 579 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 580 {
 581         DECODE_HEAD;
 582
 583         locku->lu_stateowner = NULL;
 584         READ_BUF(8);
 585         READ32(locku->lu_type);
 586         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 587                 goto xdr_error;
 588         READ32(locku->lu_seqid);
 589         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 590         if (status)
 591                 return status;
 592         READ_BUF(16);
 593         READ64(locku->lu_offset);
 594         READ64(locku->lu_length);
 595
 596         DECODE_TAIL;
 597 }
 598
 599 static __be32
 600 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 601 {
 602         DECODE_HEAD;
 603
 604         READ_BUF(4);
 605         READ32(lookup->lo_len);
 606         READ_BUF(lookup->lo_len);
 607         SAVEMEM(lookup->lo_name, lookup->lo_len);
 608         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 609                 return status;
 610
 611         DECODE_TAIL;
 612 }
 613
 614 static __be32
 615 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 616 {
 617         DECODE_HEAD;
 618
 619         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 620         open->op_iattr.ia_valid = 0;
 621         open->op_stateowner = NULL;
 622
 623         /* seqid, share_access, share_deny, clientid, ownerlen */
 624         READ_BUF(16 + sizeof(clientid_t));
 625         READ32(open->op_seqid);
 626         READ32(open->op_share_access);
 627         READ32(open->op_share_deny);
 628         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 629         READ32(open->op_owner.len);
 630
 631         /* owner, open_flag */
 632         READ_BUF(open->op_owner.len + 4);
 633         SAVEMEM(open->op_owner.data, open->op_owner.len);
 634         READ32(open->op_create);
 635         switch (open->op_create) {
 636         case NFS4_OPEN_NOCREATE:
 637                 break;
 638         case NFS4_OPEN_CREATE:
 639                 READ_BUF(4);
 640                 READ32(open->op_createmode);
 641                 switch (open->op_createmode) {
 642                 case NFS4_CREATE_UNCHECKED:
 643                 case NFS4_CREATE_GUARDED:
 644                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 645                                 &open->op_iattr, &open->op_acl);
 646                         if (status)
 647                                 goto out;
 648                         break;
 649                 case NFS4_CREATE_EXCLUSIVE:
 650                         READ_BUF(8);
 651                         COPYMEM(open->op_verf.data, 8);
 652                         break;
 653                 case NFS4_CREATE_EXCLUSIVE4_1:
 654                         if (argp->minorversion < 1)
 655                                 goto xdr_error;
 656                         READ_BUF(8);
 657                         COPYMEM(open->op_verf.data, 8);
 658                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 659                                 &open->op_iattr, &open->op_acl);
 660                         if (status)
 661                                 goto out;
 662                         break;
 663                 default:
 664                         goto xdr_error;
 665                 }
 666                 break;
 667         default:
 668                 goto xdr_error;
 669         }
 670
 671         /* open_claim */
 672         READ_BUF(4);
 673         READ32(open->op_claim_type);
 674         switch (open->op_claim_type) {
 675         case NFS4_OPEN_CLAIM_NULL:
 676         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 677                 READ_BUF(4);
 678                 READ32(open->op_fname.len);
 679                 READ_BUF(open->op_fname.len);
 680                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 681                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 682                         return status;
 683                 break;
 684         case NFS4_OPEN_CLAIM_PREVIOUS:
 685                 READ_BUF(4);
 686                 READ32(open->op_delegate_type);
 687                 break;
 688         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 689                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 690                 if (status)
 691                         return status;
 692                 READ_BUF(4);
 693                 READ32(open->op_fname.len);
 694                 READ_BUF(open->op_fname.len);
 695                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 696                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 697                         return status;
 698                 break;
 699         default:
 700                 goto xdr_error;
 701         }
 702
 703         DECODE_TAIL;
 704 }
 705
 706 static __be32
 707 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 708 {
 709         DECODE_HEAD;
 710
 711         open_conf->oc_stateowner = NULL;
 712         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 713         if (status)
 714                 return status;
 715         READ_BUF(4);
 716         READ32(open_conf->oc_seqid);
 717
 718         DECODE_TAIL;
 719 }
 720
 721 static __be32
 722 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 723 {
 724         DECODE_HEAD;
 725
 726         open_down->od_stateowner = NULL;
 727         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 728         if (status)
 729                 return status;
 730         READ_BUF(12);
 731         READ32(open_down->od_seqid);
 732         READ32(open_down->od_share_access);
 733         READ32(open_down->od_share_deny);
 734
 735         DECODE_TAIL;
 736 }
 737
 738 static __be32
 739 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 740 {
 741         DECODE_HEAD;
 742
 743         READ_BUF(4);
 744         READ32(putfh->pf_fhlen);
 745         if (putfh->pf_fhlen > NFS4_FHSIZE)
 746                 goto xdr_error;
 747         READ_BUF(putfh->pf_fhlen);
 748         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 749
 750         DECODE_TAIL;
 751 }
 752
 753 static __be32
 754 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 755 {
 756         DECODE_HEAD;
 757
 758         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 759         if (status)
 760                 return status;
 761         READ_BUF(12);
 762         READ64(read->rd_offset);
 763         READ32(read->rd_length);
 764
 765         DECODE_TAIL;
 766 }
 767
 768 static __be32
 769 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 770 {
 771         DECODE_HEAD;
 772
 773         READ_BUF(24);
 774         READ64(readdir->rd_cookie);
 775         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 776         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 777         READ32(readdir->rd_maxcount);
 778         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 779                 goto out;
 780
 781         DECODE_TAIL;
 782 }
 783
 784 static __be32
 785 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 786 {
 787         DECODE_HEAD;
 788
 789         READ_BUF(4);
 790         READ32(remove->rm_namelen);
 791         READ_BUF(remove->rm_namelen);
 792         SAVEMEM(remove->rm_name, remove->rm_namelen);
 793         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 794                 return status;
 795
 796         DECODE_TAIL;
 797 }
 798
 799 static __be32
 800 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 801 {
 802         DECODE_HEAD;
 803
 804         READ_BUF(4);
 805         READ32(rename->rn_snamelen);
 806         READ_BUF(rename->rn_snamelen + 4);
 807         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 808         READ32(rename->rn_tnamelen);
 809         READ_BUF(rename->rn_tnamelen);
 810         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 811         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 812                 return status;
 813         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 814                 return status;
 815
 816         DECODE_TAIL;
 817 }
 818
 819 static __be32
 820 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 821 {
 822         DECODE_HEAD;
 823
 824         READ_BUF(sizeof(clientid_t));
 825         COPYMEM(clientid, sizeof(clientid_t));
 826
 827         DECODE_TAIL;
 828 }
 829
 830 static __be32
 831 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 832                      struct nfsd4_secinfo *secinfo)
 833 {
 834         DECODE_HEAD;
 835
 836         READ_BUF(4);
 837         READ32(secinfo->si_namelen);
 838         READ_BUF(secinfo->si_namelen);
 839         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 840         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 841                                                                 nfserr_noent);
 842         if (status)
 843                 return status;
 844         DECODE_TAIL;
 845 }
 846
 847 static __be32
 848 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 849 {
 850         __be32 status;
 851
 852         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 853         if (status)
 854                 return status;
 855         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 856                                   &setattr->sa_acl);
 857 }
 858
 859 static __be32
 860 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 861 {
 862         DECODE_HEAD;
 863
 864         READ_BUF(12);
 865         COPYMEM(setclientid->se_verf.data, 8);
 866         READ32(setclientid->se_namelen);
 867
 868         READ_BUF(setclientid->se_namelen + 8);
 869         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 870         READ32(setclientid->se_callback_prog);
 871         READ32(setclientid->se_callback_netid_len);
 872
 873         READ_BUF(setclientid->se_callback_netid_len + 4);
 874         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 875         READ32(setclientid->se_callback_addr_len);
 876
 877         READ_BUF(setclientid->se_callback_addr_len + 4);
 878         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 879         READ32(setclientid->se_callback_ident);
 880
 881         DECODE_TAIL;
 882 }
 883
 884 static __be32
 885 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 886 {
 887         DECODE_HEAD;
 888
 889         READ_BUF(8 + sizeof(nfs4_verifier));
 890         COPYMEM(&scd_c->sc_clientid, 8);
 891         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 892
 893         DECODE_TAIL;
 894 }
 895
 896 /* Also used for NVERIFY */
 897 static __be32
 898 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 899 {
 900 #if 0
 901         struct nfsd4_compoundargs save = {
 902                 .p = argp->p,
 903                 .end = argp->end,
 904                 .rqstp = argp->rqstp,
 905         };
 906         u32             ve_bmval[2];
 907         struct iattr    ve_iattr;           /* request */
 908         struct nfs4_acl *ve_acl;            /* request */
 909 #endif
 910         DECODE_HEAD;
 911
 912         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 913                 goto out;
 914
 915         /* For convenience's sake, we compare raw xdr'd attributes in
 916          * nfsd4_proc_verify; however we still decode here just to return
 917          * correct error in case of bad xdr. */
 918 #if 0
 919         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 920         if (status == nfserr_inval) {
 921                 status = nfserrno(status);
 922                 goto out;
 923         }
 924 #endif
 925         READ_BUF(4);
 926         READ32(verify->ve_attrlen);
 927         READ_BUF(verify->ve_attrlen);
 928         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 929
 930         DECODE_TAIL;
 931 }
 932
 933 static __be32
 934 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 935 {
 936         int avail;
 937         int v;
 938         int len;
 939         DECODE_HEAD;
 940
 941         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
 942         if (status)
 943                 return status;
 944         READ_BUF(16);
 945         READ64(write->wr_offset);
 946         READ32(write->wr_stable_how);
 947         if (write->wr_stable_how > 2)
 948                 goto xdr_error;
 949         READ32(write->wr_buflen);
 950
 951         /* Sorry .. no magic macros for this.. *
 952          * READ_BUF(write->wr_buflen);
 953          * SAVEMEM(write->wr_buf, write->wr_buflen);
 954          */
 955         avail = (char*)argp->end - (char*)argp->p;
 956         if (avail + argp->pagelen < write->wr_buflen) {
 957                 dprintk("NFSD: xdr error (%s:%d)\n",
 958                                 __FILE__, __LINE__);
 959                 goto xdr_error;
 960         }
 961         argp->rqstp->rq_vec[0].iov_base = p;
 962         argp->rqstp->rq_vec[0].iov_len = avail;
 963         v = 0;
 964         len = write->wr_buflen;
 965         while (len > argp->rqstp->rq_vec[v].iov_len) {
 966                 len -= argp->rqstp->rq_vec[v].iov_len;
 967                 v++;
 968                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 969                 argp->pagelist++;
 970                 if (argp->pagelen >= PAGE_SIZE) {
 971                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 972                         argp->pagelen -= PAGE_SIZE;
 973                 } else {
 974                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 975                         argp->pagelen -= len;
 976                 }
 977         }
 978         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 979         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 980         argp->rqstp->rq_vec[v].iov_len = len;
 981         write->wr_vlen = v+1;
 982
 983         DECODE_TAIL;
 984 }
 985
 986 static __be32
 987 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 988 {
 989         DECODE_HEAD;
 990
 991         READ_BUF(12);
 992         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 993         READ32(rlockowner->rl_owner.len);
 994         READ_BUF(rlockowner->rl_owner.len);
 995         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 996
 997         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
 998                 return nfserr_inval;
 999         DECODE_TAIL;
1000 }
1001
1002 static __be32
1003 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1004                          struct nfsd4_exchange_id *exid)
1005 {
1006         int dummy;
1007         DECODE_HEAD;
1008
1009         READ_BUF(NFS4_VERIFIER_SIZE);
1010         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1011
1012         READ_BUF(4);
1013         READ32(exid->clname.len);
1014
1015         READ_BUF(exid->clname.len);
1016         SAVEMEM(exid->clname.data, exid->clname.len);
1017
1018         READ_BUF(4);
1019         READ32(exid->flags);
1020
1021         /* Ignore state_protect4_a */
1022         READ_BUF(4);
1023         READ32(exid->spa_how);
1024         switch (exid->spa_how) {
1025         case SP4_NONE:
1026                 break;
1027         case SP4_MACH_CRED:
1028                 /* spo_must_enforce */
1029                 READ_BUF(4);
1030                 READ32(dummy);
1031                 READ_BUF(dummy * 4);
1032                 p += dummy;
1033
1034                 /* spo_must_allow */
1035                 READ_BUF(4);
1036                 READ32(dummy);
1037                 READ_BUF(dummy * 4);
1038                 p += dummy;
1039                 break;
1040         case SP4_SSV:
1041                 /* ssp_ops */
1042                 READ_BUF(4);
1043                 READ32(dummy);
1044                 READ_BUF(dummy * 4);
1045                 p += dummy;
1046
1047                 READ_BUF(4);
1048                 READ32(dummy);
1049                 READ_BUF(dummy * 4);
1050                 p += dummy;
1051
1052                 /* ssp_hash_algs<> */
1053                 READ_BUF(4);
1054                 READ32(dummy);
1055                 READ_BUF(dummy);
1056                 p += XDR_QUADLEN(dummy);
1057
1058                 /* ssp_encr_algs<> */
1059                 READ_BUF(4);
1060                 READ32(dummy);
1061                 READ_BUF(dummy);
1062                 p += XDR_QUADLEN(dummy);
1063
1064                 /* ssp_window and ssp_num_gss_handles */
1065                 READ_BUF(8);
1066                 READ32(dummy);
1067                 READ32(dummy);
1068                 break;
1069         default:
1070                 goto xdr_error;
1071         }
1072
1073         /* Ignore Implementation ID */
1074         READ_BUF(4);    /* nfs_impl_id4 array length */
1075         READ32(dummy);
1076
1077         if (dummy > 1)
1078                 goto xdr_error;
1079
1080         if (dummy == 1) {
1081                 /* nii_domain */
1082                 READ_BUF(4);
1083                 READ32(dummy);
1084                 READ_BUF(dummy);
1085                 p += XDR_QUADLEN(dummy);
1086
1087                 /* nii_name */
1088                 READ_BUF(4);
1089                 READ32(dummy);
1090                 READ_BUF(dummy);
1091                 p += XDR_QUADLEN(dummy);
1092
1093                 /* nii_date */
1094                 READ_BUF(12);
1095                 p += 3;
1096         }
1097         DECODE_TAIL;
1098 }
1099
1100 static __be32
1101 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1102                             struct nfsd4_create_session *sess)
1103 {
1104         DECODE_HEAD;
1105
1106         u32 dummy;
1107         char *machine_name;
1108         int i;
1109         int nr_secflavs;
1110
1111         READ_BUF(16);
1112         COPYMEM(&sess->clientid, 8);
1113         READ32(sess->seqid);
1114         READ32(sess->flags);
1115
1116         /* Fore channel attrs */
1117         READ_BUF(28);
1118         READ32(dummy); /* headerpadsz is always 0 */
1119         READ32(sess->fore_channel.maxreq_sz);
1120         READ32(sess->fore_channel.maxresp_sz);
1121         READ32(sess->fore_channel.maxresp_cached);
1122         READ32(sess->fore_channel.maxops);
1123         READ32(sess->fore_channel.maxreqs);
1124         READ32(sess->fore_channel.nr_rdma_attrs);
1125         if (sess->fore_channel.nr_rdma_attrs == 1) {
1126                 READ_BUF(4);
1127                 READ32(sess->fore_channel.rdma_attrs);
1128         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1129                 dprintk("Too many fore channel attr bitmaps!\n");
1130                 goto xdr_error;
1131         }
1132
1133         /* Back channel attrs */
1134         READ_BUF(28);
1135         READ32(dummy); /* headerpadsz is always 0 */
1136         READ32(sess->back_channel.maxreq_sz);
1137         READ32(sess->back_channel.maxresp_sz);
1138         READ32(sess->back_channel.maxresp_cached);
1139         READ32(sess->back_channel.maxops);
1140         READ32(sess->back_channel.maxreqs);
1141         READ32(sess->back_channel.nr_rdma_attrs);
1142         if (sess->back_channel.nr_rdma_attrs == 1) {
1143                 READ_BUF(4);
1144                 READ32(sess->back_channel.rdma_attrs);
1145         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1146                 dprintk("Too many back channel attr bitmaps!\n");
1147                 goto xdr_error;
1148         }
1149
1150         READ_BUF(8);
1151         READ32(sess->callback_prog);
1152
1153         /* callback_sec_params4 */
1154         READ32(nr_secflavs);
1155         for (i = 0; i < nr_secflavs; ++i) {
1156                 READ_BUF(4);
1157                 READ32(dummy);
1158                 switch (dummy) {
1159                 case RPC_AUTH_NULL:
1160                         /* Nothing to read */
1161                         break;
1162                 case RPC_AUTH_UNIX:
1163                         READ_BUF(8);
1164                         /* stamp */
1165                         READ32(dummy);
1166
1167                         /* machine name */
1168                         READ32(dummy);
1169                         READ_BUF(dummy);
1170                         SAVEMEM(machine_name, dummy);
1171
1172                         /* uid, gid */
1173                         READ_BUF(8);
1174                         READ32(sess->uid);
1175                         READ32(sess->gid);
1176
1177                         /* more gids */
1178                         READ_BUF(4);
1179                         READ32(dummy);
1180                         READ_BUF(dummy * 4);
1181                         for (i = 0; i < dummy; ++i)
1182                                 READ32(dummy);
1183                         break;
1184                 case RPC_AUTH_GSS:
1185                         dprintk("RPC_AUTH_GSS callback secflavor "
1186                                 "not supported!\n");
1187                         READ_BUF(8);
1188                         /* gcbp_service */
1189                         READ32(dummy);
1190                         /* gcbp_handle_from_server */
1191                         READ32(dummy);
1192                         READ_BUF(dummy);
1193                         p += XDR_QUADLEN(dummy);
1194                         /* gcbp_handle_from_client */
1195                         READ_BUF(4);
1196                         READ32(dummy);
1197                         READ_BUF(dummy);
1198                         p += XDR_QUADLEN(dummy);
1199                         break;
1200                 default:
1201                         dprintk("Illegal callback secflavor\n");
1202                         return nfserr_inval;
1203                 }
1204         }
1205         DECODE_TAIL;
1206 }
1207
1208 static __be32
1209 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1210                              struct nfsd4_destroy_session *destroy_session)
1211 {
1212         DECODE_HEAD;
1213         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1214         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1215
1216         DECODE_TAIL;
1217 }
1218
1219 static __be32
1220 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1221                       struct nfsd4_sequence *seq)
1222 {
1223         DECODE_HEAD;
1224
1225         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1226         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1227         READ32(seq->seqid);
1228         READ32(seq->slotid);
1229         READ32(seq->maxslots);
1230         READ32(seq->cachethis);
1231
1232         DECODE_TAIL;
1233 }
1234
1235 static __be32
1236 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1237 {
1238         return nfs_ok;
1239 }
1240
1241 static __be32
1242 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1243 {
1244         return nfserr_notsupp;
1245 }
1246
1247 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1248
1249 static nfsd4_dec nfsd4_dec_ops[] = {
1250         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1251         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1252         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1253         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1254         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1255         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1256         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1257         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1258         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1259         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1260         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1261         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1262         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1263         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1264         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1265         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1266         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1267         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1268         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1269         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1270         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1271         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1272         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1273         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1274         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1275         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1276         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1277         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1278         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1279         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1280         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1281         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1282         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1283         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1284         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1285         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1286         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1287 };
1288
1289 static nfsd4_dec nfsd41_dec_ops[] = {
1290         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1291         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1292         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1293         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1294         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1295         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1296         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1297         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1298         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1299         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1300         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1301         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1302         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1303         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1304         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1305         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1306         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1307         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1308         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1309         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1310         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1311         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1312         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1313         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1314         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1315         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1316         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1317         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1318         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1319         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1320         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1321         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1322         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1323         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1324         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1325         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1326         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1327
1328         /* new operations for NFSv4.1 */
1329         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1330         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_notsupp,
1331         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1332         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1333         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1334         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1335         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1336         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1337         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1338         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1339         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1340         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1341         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_notsupp,
1342         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1343         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1344         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1345         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1346         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_notsupp,
1347         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_notsupp,
1348 };
1349
1350 struct nfsd4_minorversion_ops {
1351         nfsd4_dec *decoders;
1352         int nops;
1353 };
1354
1355 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1356         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1357         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1358 };
1359
1360 static __be32
1361 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1362 {
1363         DECODE_HEAD;
1364         struct nfsd4_op *op;
1365         struct nfsd4_minorversion_ops *ops;
1366         int i;
1367
1368         /*
1369          * XXX: According to spec, we should check the tag
1370          * for UTF-8 compliance.  I'm postponing this for
1371          * now because it seems that some clients do use
1372          * binary tags.
1373          */
1374         READ_BUF(4);
1375         READ32(argp->taglen);
1376         READ_BUF(argp->taglen + 8);
1377         SAVEMEM(argp->tag, argp->taglen);
1378         READ32(argp->minorversion);
1379         READ32(argp->opcnt);
1380
1381         if (argp->taglen > NFSD4_MAX_TAGLEN)
1382                 goto xdr_error;
1383         if (argp->opcnt > 100)
1384                 goto xdr_error;
1385
1386         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1387                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1388                 if (!argp->ops) {
1389                         argp->ops = argp->iops;
1390                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1391                         goto xdr_error;
1392                 }
1393         }
1394
1395         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1396                 argp->opcnt = 0;
1397
1398         ops = &nfsd4_minorversion[argp->minorversion];
1399         for (i = 0; i < argp->opcnt; i++) {
1400                 op = &argp->ops[i];
1401                 op->replay = NULL;
1402
1403                 /*
1404                  * We can't use READ_BUF() here because we need to handle
1405                  * a missing opcode as an OP_WRITE + 1. So we need to check
1406                  * to see if we're truly at the end of our buffer or if there
1407                  * is another page we need to flip to.
1408                  */
1409
1410                 if (argp->p == argp->end) {
1411                         if (argp->pagelen < 4) {
1412                                 /* There isn't an opcode still on the wire */
1413                                 op->opnum = OP_WRITE + 1;
1414                                 op->status = nfserr_bad_xdr;
1415                                 argp->opcnt = i+1;
1416                                 break;
1417                         }
1418
1419                         /*
1420                          * False alarm. We just hit a page boundary, but there
1421                          * is still data available.  Move pointer across page
1422                          * boundary.  *snip from READ_BUF*
1423                          */
1424                         argp->p = page_address(argp->pagelist[0]);
1425                         argp->pagelist++;
1426                         if (argp->pagelen < PAGE_SIZE) {
1427                                 argp->end = p + (argp->pagelen>>2);
1428                                 argp->pagelen = 0;
1429                         } else {
1430                                 argp->end = p + (PAGE_SIZE>>2);
1431                                 argp->pagelen -= PAGE_SIZE;
1432                         }
1433                 }
1434                 op->opnum = ntohl(*argp->p++);
1435
1436                 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1437                         op->status = ops->decoders[op->opnum](argp, &op->u);
1438                 else {
1439                         op->opnum = OP_ILLEGAL;
1440                         op->status = nfserr_op_illegal;
1441                 }
1442
1443                 if (op->status) {
1444                         argp->opcnt = i+1;
1445                         break;
1446                 }
1447         }
1448
1449         DECODE_TAIL;
1450 }
1451
1452 #define WRITE32(n)               *p++ = htonl(n)
1453 #define WRITE64(n)               do {                           \
1454         *p++ = htonl((u32)((n) >> 32));                         \
1455         *p++ = htonl((u32)(n));                                 \
1456 } while (0)
1457 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1458         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1459         memcpy(p, ptr, nbytes);                                 \
1460         p += XDR_QUADLEN(nbytes);                               \
1461 }} while (0)
1462
1463 static void write32(__be32 **p, u32 n)
1464 {
1465         *(*p)++ = n;
1466 }
1467
1468 static void write64(__be32 **p, u64 n)
1469 {
1470         write32(p, (u32)(n >> 32));
1471         write32(p, (u32)n);
1472 }
1473
1474 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1475 {
1476         if (IS_I_VERSION(inode)) {
1477                 write64(p, inode->i_version);
1478         } else {
1479                 write32(p, stat->ctime.tv_sec);
1480                 write32(p, stat->ctime.tv_nsec);
1481         }
1482 }
1483
1484 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1485 {
1486         write32(p, c->atomic);
1487         if (c->change_supported) {
1488                 write64(p, c->before_change);
1489                 write64(p, c->after_change);
1490         } else {
1491                 write32(p, c->before_ctime_sec);
1492                 write32(p, c->before_ctime_nsec);
1493                 write32(p, c->after_ctime_sec);
1494                 write32(p, c->after_ctime_nsec);
1495         }
1496 }
1497
1498 #define RESERVE_SPACE(nbytes)   do {                            \
1499         p = resp->p;                                            \
1500         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1501 } while (0)
1502 #define ADJUST_ARGS()           resp->p = p
1503
1504 /*
1505  * Header routine to setup seqid operation replay cache
1506  */
1507 #define ENCODE_SEQID_OP_HEAD                                    \
1508         __be32 *save;                                           \
1509                                                                 \
1510         save = resp->p;
1511
1512 /*
1513  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1514  * is where sequence id's are incremented, and the replay cache is filled.
1515  * Note that we increment sequence id's here, at the last moment, so we're sure
1516  * we know whether the error to be returned is a sequence id mutating error.
1517  */
1518
1519 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1520         if (seqid_mutating_err(nfserr) && stateowner) {         \
1521                 stateowner->so_seqid++;                         \
1522                 stateowner->so_replay.rp_status = nfserr;       \
1523                 stateowner->so_replay.rp_buflen =               \
1524                           (((char *)(resp)->p - (char *)save)); \
1525                 memcpy(stateowner->so_replay.rp_buf, save,      \
1526                         stateowner->so_replay.rp_buflen);       \
1527         } } while (0);
1528
1529 /* Encode as an array of strings the string given with components
1530  * seperated @sep.
1531  */
1532 static __be32 nfsd4_encode_components(char sep, char *components,
1533                                    __be32 **pp, int *buflen)
1534 {
1535         __be32 *p = *pp;
1536         __be32 *countp = p;
1537         int strlen, count=0;
1538         char *str, *end;
1539
1540         dprintk("nfsd4_encode_components(%s)\n", components);
1541         if ((*buflen -= 4) < 0)
1542                 return nfserr_resource;
1543         WRITE32(0); /* We will fill this in with @count later */
1544         end = str = components;
1545         while (*end) {
1546                 for (; *end && (*end != sep); end++)
1547                         ; /* Point to end of component */
1548                 strlen = end - str;
1549                 if (strlen) {
1550                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1551                                 return nfserr_resource;
1552                         WRITE32(strlen);
1553                         WRITEMEM(str, strlen);
1554                         count++;
1555                 }
1556                 else
1557                         end++;
1558                 str = end;
1559         }
1560         *pp = p;
1561         p = countp;
1562         WRITE32(count);
1563         return 0;
1564 }
1565
1566 /*
1567  * encode a location element of a fs_locations structure
1568  */
1569 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1570                                     __be32 **pp, int *buflen)
1571 {
1572         __be32 status;
1573         __be32 *p = *pp;
1574
1575         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1576         if (status)
1577                 return status;
1578         status = nfsd4_encode_components('/', location->path, &p, buflen);
1579         if (status)
1580                 return status;
1581         *pp = p;
1582         return 0;
1583 }
1584
1585 /*
1586  * Return the path to an export point in the pseudo filesystem namespace
1587  * Returned string is safe to use as long as the caller holds a reference
1588  * to @exp.
1589  */
1590 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1591 {
1592         struct svc_fh tmp_fh;
1593         char *path = NULL, *rootpath;
1594         size_t rootlen;
1595
1596         fh_init(&tmp_fh, NFS4_FHSIZE);
1597         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1598         if (*stat)
1599                 return NULL;
1600         rootpath = tmp_fh.fh_export->ex_pathname;
1601
1602         path = exp->ex_pathname;
1603
1604         rootlen = strlen(rootpath);
1605         if (strncmp(path, rootpath, rootlen)) {
1606                 dprintk("nfsd: fs_locations failed;"
1607                         "%s is not contained in %s\n", path, rootpath);
1608                 *stat = nfserr_notsupp;
1609                 path = NULL;
1610                 goto out;
1611         }
1612         path += rootlen;
1613 out:
1614         fh_put(&tmp_fh);
1615         return path;
1616 }
1617
1618 /*
1619  *  encode a fs_locations structure
1620  */
1621 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1622                                      struct svc_export *exp,
1623                                      __be32 **pp, int *buflen)
1624 {
1625         __be32 status;
1626         int i;
1627         __be32 *p = *pp;
1628         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1629         char *root = nfsd4_path(rqstp, exp, &status);
1630
1631         if (status)
1632                 return status;
1633         status = nfsd4_encode_components('/', root, &p, buflen);
1634         if (status)
1635                 return status;
1636         if ((*buflen -= 4) < 0)
1637                 return nfserr_resource;
1638         WRITE32(fslocs->locations_count);
1639         for (i=0; i<fslocs->locations_count; i++) {
1640                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1641                                                    &p, buflen);
1642                 if (status)
1643                         return status;
1644         }
1645         *pp = p;
1646         return 0;
1647 }
1648
1649 static u32 nfs4_ftypes[16] = {
1650         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1651         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1652         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1653         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1654 };
1655
1656 static __be32
1657 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1658                         __be32 **p, int *buflen)
1659 {
1660         int status;
1661
1662         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1663                 return nfserr_resource;
1664         if (whotype != NFS4_ACL_WHO_NAMED)
1665                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1666         else if (group)
1667                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1668         else
1669                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1670         if (status < 0)
1671                 return nfserrno(status);
1672         *p = xdr_encode_opaque(*p, NULL, status);
1673         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1674         BUG_ON(*buflen < 0);
1675         return 0;
1676 }
1677
1678 static inline __be32
1679 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1680 {
1681         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1682 }
1683
1684 static inline __be32
1685 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1686 {
1687         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1688 }
1689
1690 static inline __be32
1691 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1692                 __be32 **p, int *buflen)
1693 {
1694         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1695 }
1696
1697 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1698                               FATTR4_WORD0_RDATTR_ERROR)
1699 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1700
1701 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1702 {
1703         /* As per referral draft:  */
1704         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1705             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1706                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1707                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1708                         *rdattr_err = NFSERR_MOVED;
1709                 else
1710                         return nfserr_moved;
1711         }
1712         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1713         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1714         return 0;
1715 }
1716
1717 /*
1718  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1719  * ourselves.
1720  *
1721  * @countp is the buffer size in _words_; upon successful return this becomes
1722  * replaced with the number of words written.
1723  */
1724 __be32
1725 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1726                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1727                 struct svc_rqst *rqstp, int ignore_crossmnt)
1728 {
1729         u32 bmval0 = bmval[0];
1730         u32 bmval1 = bmval[1];
1731         u32 bmval2 = bmval[2];
1732         struct kstat stat;
1733         struct svc_fh tempfh;
1734         struct kstatfs statfs;
1735         int buflen = *countp << 2;
1736         __be32 *attrlenp;
1737         u32 dummy;
1738         u64 dummy64;
1739         u32 rdattr_err = 0;
1740         __be32 *p = buffer;
1741         __be32 status;
1742         int err;
1743         int aclsupport = 0;
1744         struct nfs4_acl *acl = NULL;
1745         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1746         u32 minorversion = resp->cstate.minorversion;
1747
1748         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1749         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1750         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1751         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1752
1753         if (exp->ex_fslocs.migrated) {
1754                 BUG_ON(bmval[2]);
1755                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1756                 if (status)
1757                         goto out;
1758         }
1759
1760         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1761         if (err)
1762                 goto out_nfserr;
1763         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1764                         FATTR4_WORD0_MAXNAME)) ||
1765             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1766                        FATTR4_WORD1_SPACE_TOTAL))) {
1767                 err = vfs_statfs(dentry, &statfs);
1768                 if (err)
1769                         goto out_nfserr;
1770         }
1771         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1772                 fh_init(&tempfh, NFS4_FHSIZE);
1773                 status = fh_compose(&tempfh, exp, dentry, NULL);
1774                 if (status)
1775                         goto out;
1776                 fhp = &tempfh;
1777         }
1778         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1779                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1780                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1781                 aclsupport = (err == 0);
1782                 if (bmval0 & FATTR4_WORD0_ACL) {
1783                         if (err == -EOPNOTSUPP)
1784                                 bmval0 &= ~FATTR4_WORD0_ACL;
1785                         else if (err == -EINVAL) {
1786                                 status = nfserr_attrnotsupp;
1787                                 goto out;
1788                         } else if (err != 0)
1789                                 goto out_nfserr;
1790                 }
1791         }
1792         if ((buflen -= 16) < 0)
1793                 goto out_resource;
1794
1795         if (unlikely(bmval2)) {
1796                 WRITE32(3);
1797                 WRITE32(bmval0);
1798                 WRITE32(bmval1);
1799                 WRITE32(bmval2);
1800         } else if (likely(bmval1)) {
1801                 WRITE32(2);
1802                 WRITE32(bmval0);
1803                 WRITE32(bmval1);
1804         } else {
1805                 WRITE32(1);
1806                 WRITE32(bmval0);
1807         }
1808         attrlenp = p++;                /* to be backfilled later */
1809
1810         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1811                 u32 word0 = nfsd_suppattrs0(minorversion);
1812                 u32 word1 = nfsd_suppattrs1(minorversion);
1813                 u32 word2 = nfsd_suppattrs2(minorversion);
1814
1815                 if ((buflen -= 12) < 0)
1816                         goto out_resource;
1817                 if (!aclsupport)
1818                         word0 &= ~FATTR4_WORD0_ACL;
1819                 if (!word2) {
1820                         WRITE32(2);
1821                         WRITE32(word0);
1822                         WRITE32(word1);
1823                 } else {
1824                         WRITE32(3);
1825                         WRITE32(word0);
1826                         WRITE32(word1);
1827                         WRITE32(word2);
1828                 }
1829         }
1830         if (bmval0 & FATTR4_WORD0_TYPE) {
1831                 if ((buflen -= 4) < 0)
1832                         goto out_resource;
1833                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1834                 if (dummy == NF4BAD)
1835                         goto out_serverfault;
1836                 WRITE32(dummy);
1837         }
1838         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1839                 if ((buflen -= 4) < 0)
1840                         goto out_resource;
1841                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1842                         WRITE32(NFS4_FH_PERSISTENT);
1843                 else
1844                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1845         }
1846         if (bmval0 & FATTR4_WORD0_CHANGE) {
1847                 if ((buflen -= 8) < 0)
1848                         goto out_resource;
1849                 write_change(&p, &stat, dentry->d_inode);
1850         }
1851         if (bmval0 & FATTR4_WORD0_SIZE) {
1852                 if ((buflen -= 8) < 0)
1853                         goto out_resource;
1854                 WRITE64(stat.size);
1855         }
1856         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1857                 if ((buflen -= 4) < 0)
1858                         goto out_resource;
1859                 WRITE32(1);
1860         }
1861         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1862                 if ((buflen -= 4) < 0)
1863                         goto out_resource;
1864                 WRITE32(1);
1865         }
1866         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1867                 if ((buflen -= 4) < 0)
1868                         goto out_resource;
1869                 WRITE32(0);
1870         }
1871         if (bmval0 & FATTR4_WORD0_FSID) {
1872                 if ((buflen -= 16) < 0)
1873                         goto out_resource;
1874                 if (exp->ex_fslocs.migrated) {
1875                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1876                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1877                 } else switch(fsid_source(fhp)) {
1878                 case FSIDSOURCE_FSID:
1879                         WRITE64((u64)exp->ex_fsid);
1880                         WRITE64((u64)0);
1881                         break;
1882                 case FSIDSOURCE_DEV:
1883                         WRITE32(0);
1884                         WRITE32(MAJOR(stat.dev));
1885                         WRITE32(0);
1886                         WRITE32(MINOR(stat.dev));
1887                         break;
1888                 case FSIDSOURCE_UUID:
1889                         WRITEMEM(exp->ex_uuid, 16);
1890                         break;
1891                 }
1892         }
1893         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1894                 if ((buflen -= 4) < 0)
1895                         goto out_resource;
1896                 WRITE32(0);
1897         }
1898         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1899                 if ((buflen -= 4) < 0)
1900                         goto out_resource;
1901                 WRITE32(NFSD_LEASE_TIME);
1902         }
1903         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1904                 if ((buflen -= 4) < 0)
1905                         goto out_resource;
1906                 WRITE32(rdattr_err);
1907         }
1908         if (bmval0 & FATTR4_WORD0_ACL) {
1909                 struct nfs4_ace *ace;
1910
1911                 if (acl == NULL) {
1912                         if ((buflen -= 4) < 0)
1913                                 goto out_resource;
1914
1915                         WRITE32(0);
1916                         goto out_acl;
1917                 }
1918                 if ((buflen -= 4) < 0)
1919                         goto out_resource;
1920                 WRITE32(acl->naces);
1921
1922                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1923                         if ((buflen -= 4*3) < 0)
1924                                 goto out_resource;
1925                         WRITE32(ace->type);
1926                         WRITE32(ace->flag);
1927                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1928                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1929                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1930                                 &p, &buflen);
1931                         if (status == nfserr_resource)
1932                                 goto out_resource;
1933                         if (status)
1934                                 goto out;
1935                 }
1936         }
1937 out_acl:
1938         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1939                 if ((buflen -= 4) < 0)
1940                         goto out_resource;
1941                 WRITE32(aclsupport ?
1942                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1943         }
1944         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1945                 if ((buflen -= 4) < 0)
1946                         goto out_resource;
1947                 WRITE32(1);
1948         }
1949         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1950                 if ((buflen -= 4) < 0)
1951                         goto out_resource;
1952                 WRITE32(1);
1953         }
1954         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1955                 if ((buflen -= 4) < 0)
1956                         goto out_resource;
1957                 WRITE32(1);
1958         }
1959         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1960                 if ((buflen -= 4) < 0)
1961                         goto out_resource;
1962                 WRITE32(1);
1963         }
1964         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1965                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1966                 if (buflen < 0)
1967                         goto out_resource;
1968                 WRITE32(fhp->fh_handle.fh_size);
1969                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1970         }
1971         if (bmval0 & FATTR4_WORD0_FILEID) {
1972                 if ((buflen -= 8) < 0)
1973                         goto out_resource;
1974                 WRITE64(stat.ino);
1975         }
1976         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1977                 if ((buflen -= 8) < 0)
1978                         goto out_resource;
1979                 WRITE64((u64) statfs.f_ffree);
1980         }
1981         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1982                 if ((buflen -= 8) < 0)
1983                         goto out_resource;
1984                 WRITE64((u64) statfs.f_ffree);
1985         }
1986         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1987                 if ((buflen -= 8) < 0)
1988                         goto out_resource;
1989                 WRITE64((u64) statfs.f_files);
1990         }
1991         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1992                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1993                 if (status == nfserr_resource)
1994                         goto out_resource;
1995                 if (status)
1996                         goto out;
1997         }
1998         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1999                 if ((buflen -= 4) < 0)
2000                         goto out_resource;
2001                 WRITE32(1);
2002         }
2003         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2004                 if ((buflen -= 8) < 0)
2005                         goto out_resource;
2006                 WRITE64(~(u64)0);
2007         }
2008         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2009                 if ((buflen -= 4) < 0)
2010                         goto out_resource;
2011                 WRITE32(255);
2012         }
2013         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2014                 if ((buflen -= 4) < 0)
2015                         goto out_resource;
2016                 WRITE32(statfs.f_namelen);
2017         }
2018         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2019                 if ((buflen -= 8) < 0)
2020                         goto out_resource;
2021                 WRITE64((u64) svc_max_payload(rqstp));
2022         }
2023         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2024                 if ((buflen -= 8) < 0)
2025                         goto out_resource;
2026                 WRITE64((u64) svc_max_payload(rqstp));
2027         }
2028         if (bmval1 & FATTR4_WORD1_MODE) {
2029                 if ((buflen -= 4) < 0)
2030                         goto out_resource;
2031                 WRITE32(stat.mode & S_IALLUGO);
2032         }
2033         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2034                 if ((buflen -= 4) < 0)
2035                         goto out_resource;
2036                 WRITE32(1);
2037         }
2038         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2039                 if ((buflen -= 4) < 0)
2040                         goto out_resource;
2041                 WRITE32(stat.nlink);
2042         }
2043         if (bmval1 & FATTR4_WORD1_OWNER) {
2044                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2045                 if (status == nfserr_resource)
2046                         goto out_resource;
2047                 if (status)
2048                         goto out;
2049         }
2050         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2051                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2052                 if (status == nfserr_resource)
2053                         goto out_resource;
2054                 if (status)
2055                         goto out;
2056         }
2057         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2058                 if ((buflen -= 8) < 0)
2059                         goto out_resource;
2060                 WRITE32((u32) MAJOR(stat.rdev));
2061                 WRITE32((u32) MINOR(stat.rdev));
2062         }
2063         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2064                 if ((buflen -= 8) < 0)
2065                         goto out_resource;
2066                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2067                 WRITE64(dummy64);
2068         }
2069         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2070                 if ((buflen -= 8) < 0)
2071                         goto out_resource;
2072                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2073                 WRITE64(dummy64);
2074         }
2075         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2076                 if ((buflen -= 8) < 0)
2077                         goto out_resource;
2078                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2079                 WRITE64(dummy64);
2080         }
2081         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2082                 if ((buflen -= 8) < 0)
2083                         goto out_resource;
2084                 dummy64 = (u64)stat.blocks << 9;
2085                 WRITE64(dummy64);
2086         }
2087         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2088                 if ((buflen -= 12) < 0)
2089                         goto out_resource;
2090                 WRITE32(0);
2091                 WRITE32(stat.atime.tv_sec);
2092                 WRITE32(stat.atime.tv_nsec);
2093         }
2094         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2095                 if ((buflen -= 12) < 0)
2096                         goto out_resource;
2097                 WRITE32(0);
2098                 WRITE32(1);
2099                 WRITE32(0);
2100         }
2101         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2102                 if ((buflen -= 12) < 0)
2103                         goto out_resource;
2104                 WRITE32(0);
2105                 WRITE32(stat.ctime.tv_sec);
2106                 WRITE32(stat.ctime.tv_nsec);
2107         }
2108         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2109                 if ((buflen -= 12) < 0)
2110                         goto out_resource;
2111                 WRITE32(0);
2112                 WRITE32(stat.mtime.tv_sec);
2113                 WRITE32(stat.mtime.tv_nsec);
2114         }
2115         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2116                 if ((buflen -= 8) < 0)
2117                         goto out_resource;
2118                 /*
2119                  * Get parent's attributes if not ignoring crossmount
2120                  * and this is the root of a cross-mounted filesystem.
2121                  */
2122                 if (ignore_crossmnt == 0 &&
2123                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
2124                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
2125                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
2126                         if (err)
2127                                 goto out_nfserr;
2128                 }
2129                 WRITE64(stat.ino);
2130         }
2131         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2132                 WRITE32(3);
2133                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2134                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2135                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2136         }
2137
2138         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2139         *countp = p - buffer;
2140         status = nfs_ok;
2141
2142 out:
2143         kfree(acl);
2144         if (fhp == &tempfh)
2145                 fh_put(&tempfh);
2146         return status;
2147 out_nfserr:
2148         status = nfserrno(err);
2149         goto out;
2150 out_resource:
2151         *countp = 0;
2152         status = nfserr_resource;
2153         goto out;
2154 out_serverfault:
2155         status = nfserr_serverfault;
2156         goto out;
2157 }
2158
2159 static inline int attributes_need_mount(u32 *bmval)
2160 {
2161         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2162                 return 1;
2163         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2164                 return 1;
2165         return 0;
2166 }
2167
2168 static __be32
2169 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2170                 const char *name, int namlen, __be32 *p, int *buflen)
2171 {
2172         struct svc_export *exp = cd->rd_fhp->fh_export;
2173         struct dentry *dentry;
2174         __be32 nfserr;
2175         int ignore_crossmnt = 0;
2176
2177         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2178         if (IS_ERR(dentry))
2179                 return nfserrno(PTR_ERR(dentry));
2180         if (!dentry->d_inode) {
2181                 /*
2182                  * nfsd_buffered_readdir drops the i_mutex between
2183                  * readdir and calling this callback, leaving a window
2184                  * where this directory entry could have gone away.
2185                  */
2186                 dput(dentry);
2187                 return nfserr_noent;
2188         }
2189
2190         exp_get(exp);
2191         /*
2192          * In the case of a mountpoint, the client may be asking for
2193          * attributes that are only properties of the underlying filesystem
2194          * as opposed to the cross-mounted file system. In such a case,
2195          * we will not follow the cross mount and will fill the attribtutes
2196          * directly from the mountpoint dentry.
2197          */
2198         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
2199                 ignore_crossmnt = 1;
2200         else if (d_mountpoint(dentry)) {
2201                 int err;
2202
2203                 /*
2204                  * Why the heck aren't we just using nfsd_lookup??
2205                  * Different "."/".." handling?  Something else?
2206                  * At least, add a comment here to explain....
2207                  */
2208                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2209                 if (err) {
2210                         nfserr = nfserrno(err);
2211                         goto out_put;
2212                 }
2213                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2214                 if (nfserr)
2215                         goto out_put;
2216
2217         }
2218         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2219                                         cd->rd_rqstp, ignore_crossmnt);
2220 out_put:
2221         dput(dentry);
2222         exp_put(exp);
2223         return nfserr;
2224 }
2225
2226 static __be32 *
2227 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2228 {
2229         __be32 *attrlenp;
2230
2231         if (buflen < 6)
2232                 return NULL;
2233         *p++ = htonl(2);
2234         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2235         *p++ = htonl(0);                         /* bmval1 */
2236
2237         attrlenp = p++;
2238         *p++ = nfserr;       /* no htonl */
2239         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2240         return p;
2241 }
2242
2243 static int
2244 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2245                     loff_t offset, u64 ino, unsigned int d_type)
2246 {
2247         struct readdir_cd *ccd = ccdv;
2248         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2249         int buflen;
2250         __be32 *p = cd->buffer;
2251         __be32 *cookiep;
2252         __be32 nfserr = nfserr_toosmall;
2253
2254         /* In nfsv4, "." and ".." never make it onto the wire.. */
2255         if (name && isdotent(name, namlen)) {
2256                 cd->common.err = nfs_ok;
2257                 return 0;
2258         }
2259
2260         if (cd->offset)
2261                 xdr_encode_hyper(cd->offset, (u64) offset);
2262
2263         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2264         if (buflen < 0)
2265                 goto fail;
2266
2267         *p++ = xdr_one;                             /* mark entry present */
2268         cookiep = p;
2269         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2270         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2271
2272         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2273         switch (nfserr) {
2274         case nfs_ok:
2275                 p += buflen;
2276                 break;
2277         case nfserr_resource:
2278                 nfserr = nfserr_toosmall;
2279                 goto fail;
2280         case nfserr_dropit:
2281                 goto fail;
2282         case nfserr_noent:
2283                 goto skip_entry;
2284         default:
2285                 /*
2286                  * If the client requested the RDATTR_ERROR attribute,
2287                  * we stuff the error code into this attribute
2288                  * and continue.  If this attribute was not requested,
2289                  * then in accordance with the spec, we fail the
2290                  * entire READDIR operation(!)
2291                  */
2292                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2293                         goto fail;
2294                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2295                 if (p == NULL) {
2296                         nfserr = nfserr_toosmall;
2297                         goto fail;
2298                 }
2299         }
2300         cd->buflen -= (p - cd->buffer);
2301         cd->buffer = p;
2302         cd->offset = cookiep;
2303 skip_entry:
2304         cd->common.err = nfs_ok;
2305         return 0;
2306 fail:
2307         cd->common.err = nfserr;
2308         return -EINVAL;
2309 }
2310
2311 static void
2312 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2313 {
2314         __be32 *p;
2315
2316         RESERVE_SPACE(sizeof(stateid_t));
2317         WRITE32(sid->si_generation);
2318         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2319         ADJUST_ARGS();
2320 }
2321
2322 static __be32
2323 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2324 {
2325         __be32 *p;
2326
2327         if (!nfserr) {
2328                 RESERVE_SPACE(8);
2329                 WRITE32(access->ac_supported);
2330                 WRITE32(access->ac_resp_access);
2331                 ADJUST_ARGS();
2332         }
2333         return nfserr;
2334 }
2335
2336 static __be32
2337 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2338 {
2339         ENCODE_SEQID_OP_HEAD;
2340
2341         if (!nfserr)
2342                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2343
2344         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2345         return nfserr;
2346 }
2347
2348
2349 static __be32
2350 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2351 {
2352         __be32 *p;
2353
2354         if (!nfserr) {
2355                 RESERVE_SPACE(8);
2356                 WRITEMEM(commit->co_verf.data, 8);
2357                 ADJUST_ARGS();
2358         }
2359         return nfserr;
2360 }
2361
2362 static __be32
2363 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2364 {
2365         __be32 *p;
2366
2367         if (!nfserr) {
2368                 RESERVE_SPACE(32);
2369                 write_cinfo(&p, &create->cr_cinfo);
2370                 WRITE32(2);
2371                 WRITE32(create->cr_bmval[0]);
2372                 WRITE32(create->cr_bmval[1]);
2373                 ADJUST_ARGS();
2374         }
2375         return nfserr;
2376 }
2377
2378 static __be32
2379 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2380 {
2381         struct svc_fh *fhp = getattr->ga_fhp;
2382         int buflen;
2383
2384         if (nfserr)
2385                 return nfserr;
2386
2387         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2388         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2389                                     resp->p, &buflen, getattr->ga_bmval,
2390                                     resp->rqstp, 0);
2391         if (!nfserr)
2392                 resp->p += buflen;
2393         return nfserr;
2394 }
2395
2396 static __be32
2397 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2398 {
2399         struct svc_fh *fhp = *fhpp;
2400         unsigned int len;
2401         __be32 *p;
2402
2403         if (!nfserr) {
2404                 len = fhp->fh_handle.fh_size;
2405                 RESERVE_SPACE(len + 4);
2406                 WRITE32(len);
2407                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2408                 ADJUST_ARGS();
2409         }
2410         return nfserr;
2411 }
2412
2413 /*
2414 * Including all fields other than the name, a LOCK4denied structure requires
2415 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2416 */
2417 static void
2418 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2419 {
2420         __be32 *p;
2421
2422         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2423         WRITE64(ld->ld_start);
2424         WRITE64(ld->ld_length);
2425         WRITE32(ld->ld_type);
2426         if (ld->ld_sop) {
2427                 WRITEMEM(&ld->ld_clientid, 8);
2428                 WRITE32(ld->ld_sop->so_owner.len);
2429                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2430                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2431         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2432                 WRITE64((u64)0); /* clientid */
2433                 WRITE32(0); /* length of owner name */
2434         }
2435         ADJUST_ARGS();
2436 }
2437
2438 static __be32
2439 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2440 {
2441         ENCODE_SEQID_OP_HEAD;
2442
2443         if (!nfserr)
2444                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2445         else if (nfserr == nfserr_denied)
2446                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2447
2448         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2449         return nfserr;
2450 }
2451
2452 static __be32
2453 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2454 {
2455         if (nfserr == nfserr_denied)
2456                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2457         return nfserr;
2458 }
2459
2460 static __be32
2461 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2462 {
2463         ENCODE_SEQID_OP_HEAD;
2464
2465         if (!nfserr)
2466                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2467
2468         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2469         return nfserr;
2470 }
2471
2472
2473 static __be32
2474 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2475 {
2476         __be32 *p;
2477
2478         if (!nfserr) {
2479                 RESERVE_SPACE(20);
2480                 write_cinfo(&p, &link->li_cinfo);
2481                 ADJUST_ARGS();
2482         }
2483         return nfserr;
2484 }
2485
2486
2487 static __be32
2488 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2489 {
2490         __be32 *p;
2491         ENCODE_SEQID_OP_HEAD;
2492
2493         if (nfserr)
2494                 goto out;
2495
2496         nfsd4_encode_stateid(resp, &open->op_stateid);
2497         RESERVE_SPACE(40);
2498         write_cinfo(&p, &open->op_cinfo);
2499         WRITE32(open->op_rflags);
2500         WRITE32(2);
2501         WRITE32(open->op_bmval[0]);
2502         WRITE32(open->op_bmval[1]);
2503         WRITE32(open->op_delegate_type);
2504         ADJUST_ARGS();
2505
2506         switch (open->op_delegate_type) {
2507         case NFS4_OPEN_DELEGATE_NONE:
2508                 break;
2509         case NFS4_OPEN_DELEGATE_READ:
2510                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2511                 RESERVE_SPACE(20);
2512                 WRITE32(open->op_recall);
2513
2514                 /*
2515                  * TODO: ACE's in delegations
2516                  */
2517                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2518                 WRITE32(0);
2519                 WRITE32(0);
2520                 WRITE32(0);   /* XXX: is NULL principal ok? */
2521                 ADJUST_ARGS();
2522                 break;
2523         case NFS4_OPEN_DELEGATE_WRITE:
2524                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2525                 RESERVE_SPACE(32);
2526                 WRITE32(0);
2527
2528                 /*
2529                  * TODO: space_limit's in delegations
2530                  */
2531                 WRITE32(NFS4_LIMIT_SIZE);
2532                 WRITE32(~(u32)0);
2533                 WRITE32(~(u32)0);
2534
2535                 /*
2536                  * TODO: ACE's in delegations
2537                  */
2538                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2539                 WRITE32(0);
2540                 WRITE32(0);
2541                 WRITE32(0);   /* XXX: is NULL principal ok? */
2542                 ADJUST_ARGS();
2543                 break;
2544         default:
2545                 BUG();
2546         }
2547         /* XXX save filehandle here */
2548 out:
2549         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2550         return nfserr;
2551 }
2552
2553 static __be32
2554 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2555 {
2556         ENCODE_SEQID_OP_HEAD;
2557
2558         if (!nfserr)
2559                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2560
2561         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2562         return nfserr;
2563 }
2564
2565 static __be32
2566 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2567 {
2568         ENCODE_SEQID_OP_HEAD;
2569
2570         if (!nfserr)
2571                 nfsd4_encode_stateid(resp, &od->od_stateid);
2572
2573         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2574         return nfserr;
2575 }
2576
2577 static __be32
2578 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2579                   struct nfsd4_read *read)
2580 {
2581         u32 eof;
2582         int v, pn;
2583         unsigned long maxcount;
2584         long len;
2585         __be32 *p;
2586
2587         if (nfserr)
2588                 return nfserr;
2589         if (resp->xbuf->page_len)
2590                 return nfserr_resource;
2591
2592         RESERVE_SPACE(8); /* eof flag and byte count */
2593
2594         maxcount = svc_max_payload(resp->rqstp);
2595         if (maxcount > read->rd_length)
2596                 maxcount = read->rd_length;
2597
2598         len = maxcount;
2599         v = 0;
2600         while (len > 0) {
2601                 pn = resp->rqstp->rq_resused++;
2602                 resp->rqstp->rq_vec[v].iov_base =
2603                         page_address(resp->rqstp->rq_respages[pn]);
2604                 resp->rqstp->rq_vec[v].iov_len =
2605                         len < PAGE_SIZE ? len : PAGE_SIZE;
2606                 v++;
2607                 len -= PAGE_SIZE;
2608         }
2609         read->rd_vlen = v;
2610
2611         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2612                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2613                         &maxcount);
2614
2615         if (nfserr == nfserr_symlink)
2616                 nfserr = nfserr_inval;
2617         if (nfserr)
2618                 return nfserr;
2619         eof = (read->rd_offset + maxcount >=
2620                read->rd_fhp->fh_dentry->d_inode->i_size);
2621
2622         WRITE32(eof);
2623         WRITE32(maxcount);
2624         ADJUST_ARGS();
2625         resp->xbuf->head[0].iov_len = (char*)p
2626                                         - (char*)resp->xbuf->head[0].iov_base;
2627         resp->xbuf->page_len = maxcount;
2628
2629         /* Use rest of head for padding and remaining ops: */
2630         resp->xbuf->tail[0].iov_base = p;
2631         resp->xbuf->tail[0].iov_len = 0;
2632         if (maxcount&3) {
2633                 RESERVE_SPACE(4);
2634                 WRITE32(0);
2635                 resp->xbuf->tail[0].iov_base += maxcount&3;
2636                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2637                 ADJUST_ARGS();
2638         }
2639         return 0;
2640 }
2641
2642 static __be32
2643 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2644 {
2645         int maxcount;
2646         char *page;
2647         __be32 *p;
2648
2649         if (nfserr)
2650                 return nfserr;
2651         if (resp->xbuf->page_len)
2652                 return nfserr_resource;
2653
2654         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2655
2656         maxcount = PAGE_SIZE;
2657         RESERVE_SPACE(4);
2658
2659         /*
2660          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2661          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2662          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2663          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2664          */
2665         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2666         if (nfserr == nfserr_isdir)
2667                 return nfserr_inval;
2668         if (nfserr)
2669                 return nfserr;
2670
2671         WRITE32(maxcount);
2672         ADJUST_ARGS();
2673         resp->xbuf->head[0].iov_len = (char*)p
2674                                 - (char*)resp->xbuf->head[0].iov_base;
2675         resp->xbuf->page_len = maxcount;
2676
2677         /* Use rest of head for padding and remaining ops: */
2678         resp->xbuf->tail[0].iov_base = p;
2679         resp->xbuf->tail[0].iov_len = 0;
2680         if (maxcount&3) {
2681                 RESERVE_SPACE(4);
2682                 WRITE32(0);
2683                 resp->xbuf->tail[0].iov_base += maxcount&3;
2684                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2685                 ADJUST_ARGS();
2686         }
2687         return 0;
2688 }
2689
2690 static __be32
2691 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2692 {
2693         int maxcount;
2694         loff_t offset;
2695         __be32 *page, *savep, *tailbase;
2696         __be32 *p;
2697
2698         if (nfserr)
2699                 return nfserr;
2700         if (resp->xbuf->page_len)
2701                 return nfserr_resource;
2702
2703         RESERVE_SPACE(8);  /* verifier */
2704         savep = p;
2705
2706         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2707         WRITE32(0);
2708         WRITE32(0);
2709         ADJUST_ARGS();
2710         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2711         tailbase = p;
2712
2713         maxcount = PAGE_SIZE;
2714         if (maxcount > readdir->rd_maxcount)
2715                 maxcount = readdir->rd_maxcount;
2716
2717         /*
2718          * Convert from bytes to words, account for the two words already
2719          * written, make sure to leave two words at the end for the next
2720          * pointer and eof field.
2721          */
2722         maxcount = (maxcount >> 2) - 4;
2723         if (maxcount < 0) {
2724                 nfserr =  nfserr_toosmall;
2725                 goto err_no_verf;
2726         }
2727
2728         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2729         readdir->common.err = 0;
2730         readdir->buflen = maxcount;
2731         readdir->buffer = page;
2732         readdir->offset = NULL;
2733
2734         offset = readdir->rd_cookie;
2735         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2736                               &offset,
2737                               &readdir->common, nfsd4_encode_dirent);
2738         if (nfserr == nfs_ok &&
2739             readdir->common.err == nfserr_toosmall &&
2740             readdir->buffer == page)
2741                 nfserr = nfserr_toosmall;
2742         if (nfserr == nfserr_symlink)
2743                 nfserr = nfserr_notdir;
2744         if (nfserr)
2745                 goto err_no_verf;
2746
2747         if (readdir->offset)
2748                 xdr_encode_hyper(readdir->offset, offset);
2749
2750         p = readdir->buffer;
2751         *p++ = 0;       /* no more entries */
2752         *p++ = htonl(readdir->common.err == nfserr_eof);
2753         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2754                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2755
2756         /* Use rest of head for padding and remaining ops: */
2757         resp->xbuf->tail[0].iov_base = tailbase;
2758         resp->xbuf->tail[0].iov_len = 0;
2759         resp->p = resp->xbuf->tail[0].iov_base;
2760         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2761
2762         return 0;
2763 err_no_verf:
2764         p = savep;
2765         ADJUST_ARGS();
2766         return nfserr;
2767 }
2768
2769 static __be32
2770 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2771 {
2772         __be32 *p;
2773
2774         if (!nfserr) {
2775                 RESERVE_SPACE(20);
2776                 write_cinfo(&p, &remove->rm_cinfo);
2777                 ADJUST_ARGS();
2778         }
2779         return nfserr;
2780 }
2781
2782 static __be32
2783 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2784 {
2785         __be32 *p;
2786
2787         if (!nfserr) {
2788                 RESERVE_SPACE(40);
2789                 write_cinfo(&p, &rename->rn_sinfo);
2790                 write_cinfo(&p, &rename->rn_tinfo);
2791                 ADJUST_ARGS();
2792         }
2793         return nfserr;
2794 }
2795
2796 static __be32
2797 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2798                      struct nfsd4_secinfo *secinfo)
2799 {
2800         int i = 0;
2801         struct svc_export *exp = secinfo->si_exp;
2802         u32 nflavs;
2803         struct exp_flavor_info *flavs;
2804         struct exp_flavor_info def_flavs[2];
2805         __be32 *p;
2806
2807         if (nfserr)
2808                 goto out;
2809         if (exp->ex_nflavors) {
2810                 flavs = exp->ex_flavors;
2811                 nflavs = exp->ex_nflavors;
2812         } else { /* Handling of some defaults in absence of real secinfo: */
2813                 flavs = def_flavs;
2814                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2815                         nflavs = 2;
2816                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2817                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2818                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2819                         nflavs = 1;
2820                         flavs[0].pseudoflavor
2821                                         = svcauth_gss_flavor(exp->ex_client);
2822                 } else {
2823                         nflavs = 1;
2824                         flavs[0].pseudoflavor
2825                                         = exp->ex_client->flavour->flavour;
2826                 }
2827         }
2828
2829         RESERVE_SPACE(4);
2830         WRITE32(nflavs);
2831         ADJUST_ARGS();
2832         for (i = 0; i < nflavs; i++) {
2833                 u32 flav = flavs[i].pseudoflavor;
2834                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2835
2836                 if (gm) {
2837                         RESERVE_SPACE(4);
2838                         WRITE32(RPC_AUTH_GSS);
2839                         ADJUST_ARGS();
2840                         RESERVE_SPACE(4 + gm->gm_oid.len);
2841                         WRITE32(gm->gm_oid.len);
2842                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2843                         ADJUST_ARGS();
2844                         RESERVE_SPACE(4);
2845                         WRITE32(0); /* qop */
2846                         ADJUST_ARGS();
2847                         RESERVE_SPACE(4);
2848                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2849                         ADJUST_ARGS();
2850                         gss_mech_put(gm);
2851                 } else {
2852                         RESERVE_SPACE(4);
2853                         WRITE32(flav);
2854                         ADJUST_ARGS();
2855                 }
2856         }
2857 out:
2858         if (exp)
2859                 exp_put(exp);
2860         return nfserr;
2861 }
2862
2863 /*
2864  * The SETATTR encode routine is special -- it always encodes a bitmap,
2865  * regardless of the error status.
2866  */
2867 static __be32
2868 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2869 {
2870         __be32 *p;
2871
2872         RESERVE_SPACE(12);
2873         if (nfserr) {
2874                 WRITE32(2);
2875                 WRITE32(0);
2876                 WRITE32(0);
2877         }
2878         else {
2879                 WRITE32(2);
2880                 WRITE32(setattr->sa_bmval[0]);
2881                 WRITE32(setattr->sa_bmval[1]);
2882         }
2883         ADJUST_ARGS();
2884         return nfserr;
2885 }
2886
2887 static __be32
2888 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2889 {
2890         __be32 *p;
2891
2892         if (!nfserr) {
2893                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2894                 WRITEMEM(&scd->se_clientid, 8);
2895                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2896                 ADJUST_ARGS();
2897         }
2898         else if (nfserr == nfserr_clid_inuse) {
2899                 RESERVE_SPACE(8);
2900                 WRITE32(0);
2901                 WRITE32(0);
2902                 ADJUST_ARGS();
2903         }
2904         return nfserr;
2905 }
2906
2907 static __be32
2908 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2909 {
2910         __be32 *p;
2911
2912         if (!nfserr) {
2913                 RESERVE_SPACE(16);
2914                 WRITE32(write->wr_bytes_written);
2915                 WRITE32(write->wr_how_written);
2916                 WRITEMEM(write->wr_verifier.data, 8);
2917                 ADJUST_ARGS();
2918         }
2919         return nfserr;
2920 }
2921
2922 static __be32
2923 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2924                          struct nfsd4_exchange_id *exid)
2925 {
2926         __be32 *p;
2927         char *major_id;
2928         char *server_scope;
2929         int major_id_sz;
2930         int server_scope_sz;
2931         uint64_t minor_id = 0;
2932
2933         if (nfserr)
2934                 return nfserr;
2935
2936         major_id = utsname()->nodename;
2937         major_id_sz = strlen(major_id);
2938         server_scope = utsname()->nodename;
2939         server_scope_sz = strlen(server_scope);
2940
2941         RESERVE_SPACE(
2942                 8 /* eir_clientid */ +
2943                 4 /* eir_sequenceid */ +
2944                 4 /* eir_flags */ +
2945                 4 /* spr_how (SP4_NONE) */ +
2946                 8 /* so_minor_id */ +
2947                 4 /* so_major_id.len */ +
2948                 (XDR_QUADLEN(major_id_sz) * 4) +
2949                 4 /* eir_server_scope.len */ +
2950                 (XDR_QUADLEN(server_scope_sz) * 4) +
2951                 4 /* eir_server_impl_id.count (0) */);
2952
2953         WRITEMEM(&exid->clientid, 8);
2954         WRITE32(exid->seqid);
2955         WRITE32(exid->flags);
2956
2957         /* state_protect4_r. Currently only support SP4_NONE */
2958         BUG_ON(exid->spa_how != SP4_NONE);
2959         WRITE32(exid->spa_how);
2960
2961         /* The server_owner struct */
2962         WRITE64(minor_id);      /* Minor id */
2963         /* major id */
2964         WRITE32(major_id_sz);
2965         WRITEMEM(major_id, major_id_sz);
2966
2967         /* Server scope */
2968         WRITE32(server_scope_sz);
2969         WRITEMEM(server_scope, server_scope_sz);
2970
2971         /* Implementation id */
2972         WRITE32(0);     /* zero length nfs_impl_id4 array */
2973         ADJUST_ARGS();
2974         return 0;
2975 }
2976
2977 static __be32
2978 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
2979                             struct nfsd4_create_session *sess)
2980 {
2981         __be32 *p;
2982
2983         if (nfserr)
2984                 return nfserr;
2985
2986         RESERVE_SPACE(24);
2987         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2988         WRITE32(sess->seqid);
2989         WRITE32(sess->flags);
2990         ADJUST_ARGS();
2991
2992         RESERVE_SPACE(28);
2993         WRITE32(0); /* headerpadsz */
2994         WRITE32(sess->fore_channel.maxreq_sz);
2995         WRITE32(sess->fore_channel.maxresp_sz);
2996         WRITE32(sess->fore_channel.maxresp_cached);
2997         WRITE32(sess->fore_channel.maxops);
2998         WRITE32(sess->fore_channel.maxreqs);
2999         WRITE32(sess->fore_channel.nr_rdma_attrs);
3000         ADJUST_ARGS();
3001
3002         if (sess->fore_channel.nr_rdma_attrs) {
3003                 RESERVE_SPACE(4);
3004                 WRITE32(sess->fore_channel.rdma_attrs);
3005                 ADJUST_ARGS();
3006         }
3007
3008         RESERVE_SPACE(28);
3009         WRITE32(0); /* headerpadsz */
3010         WRITE32(sess->back_channel.maxreq_sz);
3011         WRITE32(sess->back_channel.maxresp_sz);
3012         WRITE32(sess->back_channel.maxresp_cached);
3013         WRITE32(sess->back_channel.maxops);
3014         WRITE32(sess->back_channel.maxreqs);
3015         WRITE32(sess->back_channel.nr_rdma_attrs);
3016         ADJUST_ARGS();
3017
3018         if (sess->back_channel.nr_rdma_attrs) {
3019                 RESERVE_SPACE(4);
3020                 WRITE32(sess->back_channel.rdma_attrs);
3021                 ADJUST_ARGS();
3022         }
3023         return 0;
3024 }
3025
3026 static __be32
3027 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3028                              struct nfsd4_destroy_session *destroy_session)
3029 {
3030         return nfserr;
3031 }
3032
3033 __be32
3034 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3035                       struct nfsd4_sequence *seq)
3036 {
3037         __be32 *p;
3038
3039         if (nfserr)
3040                 return nfserr;
3041
3042         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3043         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3044         WRITE32(seq->seqid);
3045         WRITE32(seq->slotid);
3046         WRITE32(seq->maxslots);
3047         /*
3048          * FIXME: for now:
3049          *   target_maxslots = maxslots
3050          *   status_flags = 0
3051          */
3052         WRITE32(seq->maxslots);
3053         WRITE32(0);
3054
3055         ADJUST_ARGS();
3056         resp->cstate.datap = p; /* DRC cache data pointer */
3057         return 0;
3058 }
3059
3060 static __be32
3061 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3062 {
3063         return nfserr;
3064 }
3065
3066 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3067
3068 /*
3069  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3070  * since we don't need to filter out obsolete ops as this is
3071  * done in the decoding phase.
3072  */
3073 static nfsd4_enc nfsd4_enc_ops[] = {
3074         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3075         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3076         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3077         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3078         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3079         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3080         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3081         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3082         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3083         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3084         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3085         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3086         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3087         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3088         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3089         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3090         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3091         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3092         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3093         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3094         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3095         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3096         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3097         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3098         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3099         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3100         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3101         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3102         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3103         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3104         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3105         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3106         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3107         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3108         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3109         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3110         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3111
3112         /* NFSv4.1 operations */
3113         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3114         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3115         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3116         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3117         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3118         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3119         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3120         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3121         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3122         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3123         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3124         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3125         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
3126         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3127         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3128         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3129         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3130         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3131         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3132 };
3133
3134 /*
3135  * Calculate the total amount of memory that the compound response has taken
3136  * after encoding the current operation.
3137  *
3138  * pad: add on 8 bytes for the next operation's op_code and status so that
3139  * there is room to cache a failure on the next operation.
3140  *
3141  * Compare this length to the session se_fmaxresp_cached.
3142  *
3143  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3144  * will be at least a page and will therefore hold the xdr_buf head.
3145  */
3146 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3147 {
3148         int status = 0;
3149         struct xdr_buf *xb = &resp->rqstp->rq_res;
3150         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3151         struct nfsd4_session *session = NULL;
3152         struct nfsd4_slot *slot = resp->cstate.slot;
3153         u32 length, tlen = 0, pad = 8;
3154
3155         if (!nfsd4_has_session(&resp->cstate))
3156                 return status;
3157
3158         session = resp->cstate.session;
3159         if (session == NULL || slot->sl_cachethis == 0)
3160                 return status;
3161
3162         if (resp->opcnt >= args->opcnt)
3163                 pad = 0; /* this is the last operation */
3164
3165         if (xb->page_len == 0) {
3166                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3167         } else {
3168                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3169                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3170
3171                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3172         }
3173         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3174                 length, xb->page_len, tlen, pad);
3175
3176         if (length <= session->se_fchannel.maxresp_cached)
3177                 return status;
3178         else
3179                 return nfserr_rep_too_big_to_cache;
3180 }
3181
3182 void
3183 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3184 {
3185         __be32 *statp;
3186         __be32 *p;
3187
3188         RESERVE_SPACE(8);
3189         WRITE32(op->opnum);
3190         statp = p++;    /* to be backfilled at the end */
3191         ADJUST_ARGS();
3192
3193         if (op->opnum == OP_ILLEGAL)
3194                 goto status;
3195         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3196                !nfsd4_enc_ops[op->opnum]);
3197         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3198         /* nfsd4_check_drc_limit guarantees enough room for error status */
3199         if (!op->status && nfsd4_check_drc_limit(resp))
3200                 op->status = nfserr_rep_too_big_to_cache;
3201 status:
3202         /*
3203          * Note: We write the status directly, instead of using WRITE32(),
3204          * since it is already in network byte order.
3205          */
3206         *statp = op->status;
3207 }
3208
3209 /*
3210  * Encode the reply stored in the stateowner reply cache
3211  *
3212  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3213  * previously sent already encoded operation.
3214  *
3215  * called with nfs4_lock_state() held
3216  */
3217 void
3218 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3219 {
3220         __be32 *p;
3221         struct nfs4_replay *rp = op->replay;
3222
3223         BUG_ON(!rp);
3224
3225         RESERVE_SPACE(8);
3226         WRITE32(op->opnum);
3227         *p++ = rp->rp_status;  /* already xdr'ed */
3228         ADJUST_ARGS();
3229
3230         RESERVE_SPACE(rp->rp_buflen);
3231         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3232         ADJUST_ARGS();
3233 }
3234
3235 int
3236 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3237 {
3238         return xdr_ressize_check(rqstp, p);
3239 }
3240
3241 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3242 {
3243         if (args->ops != args->iops) {
3244                 kfree(args->ops);
3245                 args->ops = args->iops;
3246         }
3247         kfree(args->tmpp);
3248         args->tmpp = NULL;
3249         while (args->to_free) {
3250                 struct tmpbuf *tb = args->to_free;
3251                 args->to_free = tb->next;
3252                 tb->release(tb->buf);
3253                 kfree(tb);
3254         }
3255 }
3256
3257 int
3258 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3259 {
3260         __be32 status;
3261
3262         args->p = p;
3263         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3264         args->pagelist = rqstp->rq_arg.pages;
3265         args->pagelen = rqstp->rq_arg.page_len;
3266         args->tmpp = NULL;
3267         args->to_free = NULL;
3268         args->ops = args->iops;
3269         args->rqstp = rqstp;
3270
3271         status = nfsd4_decode_compound(args);
3272         if (status) {
3273                 nfsd4_release_compoundargs(args);
3274         }
3275         return !status;
3276 }
3277
3278 int
3279 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3280 {
3281         /*
3282          * All that remains is to write the tag and operation count...
3283          */
3284         struct nfsd4_compound_state *cs = &resp->cstate;
3285         struct kvec *iov;
3286         p = resp->tagp;
3287         *p++ = htonl(resp->taglen);
3288         memcpy(p, resp->tag, resp->taglen);
3289         p += XDR_QUADLEN(resp->taglen);
3290         *p++ = htonl(resp->opcnt);
3291
3292         if (rqstp->rq_res.page_len)
3293                 iov = &rqstp->rq_res.tail[0];
3294         else
3295                 iov = &rqstp->rq_res.head[0];
3296         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3297         BUG_ON(iov->iov_len > PAGE_SIZE);
3298         if (nfsd4_has_session(cs) && cs->status != nfserr_replay_cache) {
3299                 nfsd4_store_cache_entry(resp);
3300                 dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3301                 resp->cstate.slot->sl_inuse = false;
3302                 nfsd4_put_session(resp->cstate.session);
3303         }
3304         return 1;
3305 }
3306
3307 /*
3308  * Local variables:
3309  *  c-basic-offset: 8
3310  * End:
3311  */