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   1 /*
   2  *  fs/nfs/nfs4xdr.c
   3  *
   4  *  Server-side XDR for NFSv4
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * TODO: Neil Brown made the following observation:  We currently
  38  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  39  * never release any of that until the request is complete.
  40  * It would be good to calculate a new maximum response size while
  41  * decoding the COMPOUND, and call svc_reserve with this number
  42  * at the end of nfs4svc_decode_compoundargs.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/smp.h>
  47 #include <linux/fs.h>
  48 #include <linux/namei.h>
  49 #include <linux/vfs.h>
  50 #include <linux/sunrpc/xdr.h>
  51 #include <linux/sunrpc/svc.h>
  52 #include <linux/sunrpc/clnt.h>
  53 #include <linux/nfsd/nfsd.h>
  54 #include <linux/nfsd/state.h>
  55 #include <linux/nfsd/xdr4.h>
  56 #include <linux/nfsd_idmap.h>
  57 #include <linux/nfs4.h>
  58 #include <linux/nfs4_acl.h>
  59
  60 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  61
  62 /*
  63  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  64  * directory in order to indicate to the client that a filesystem boundary is present
  65  * We use a fixed fsid for a referral
  66  */
  67 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  68 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  69
  70 static __be32
  71 check_filename(char *str, int len, __be32 err)
  72 {
  73         int i;
  74
  75         if (len == 0)
  76                 return nfserr_inval;
  77         if (isdotent(str, len))
  78                 return err;
  79         for (i = 0; i < len; i++)
  80                 if (str[i] == '/')
  81                         return err;
  82         return 0;
  83 }
  84
  85 /*
  86  * START OF "GENERIC" DECODE ROUTINES.
  87  *   These may look a little ugly since they are imported from a "generic"
  88  * set of XDR encode/decode routines which are intended to be shared by
  89  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  90  *
  91  * If the pain of reading these is too great, it should be a straightforward
  92  * task to translate them into Linux-specific versions which are more
  93  * consistent with the style used in NFSv2/v3...
  94  */
  95 #define DECODE_HEAD                             \
  96         __be32 *p;                              \
  97         __be32 status
  98 #define DECODE_TAIL                             \
  99         status = 0;                             \
 100 out:                                            \
 101         return status;                          \
 102 xdr_error:                                      \
 103         printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 104         status = nfserr_bad_xdr;                \
 105         goto out
 106
 107 #define READ32(x)         (x) = ntohl(*p++)
 108 #define READ64(x)         do {                  \
 109         (x) = (u64)ntohl(*p++) << 32;           \
 110         (x) |= ntohl(*p++);                     \
 111 } while (0)
 112 #define READTIME(x)       do {                  \
 113         p++;                                    \
 114         (x) = ntohl(*p++);                      \
 115         p++;                                    \
 116 } while (0)
 117 #define READMEM(x,nbytes) do {                  \
 118         x = (char *)p;                          \
 119         p += XDR_QUADLEN(nbytes);               \
 120 } while (0)
 121 #define SAVEMEM(x,nbytes) do {                  \
 122         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 123                 savemem(argp, p, nbytes) :      \
 124                 (char *)p)) {                   \
 125                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 126                 goto xdr_error;                 \
 127                 }                               \
 128         p += XDR_QUADLEN(nbytes);               \
 129 } while (0)
 130 #define COPYMEM(x,nbytes) do {                  \
 131         memcpy((x), p, nbytes);                 \
 132         p += XDR_QUADLEN(nbytes);               \
 133 } while (0)
 134
 135 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 136 #define READ_BUF(nbytes)  do {                  \
 137         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 138                 p = argp->p;                    \
 139                 argp->p += XDR_QUADLEN(nbytes); \
 140         } else if (!(p = read_buf(argp, nbytes))) { \
 141                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 142                 goto xdr_error;                 \
 143         }                                       \
 144 } while (0)
 145
 146 static __be32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
 147 {
 148         /* We want more bytes than seem to be available.
 149          * Maybe we need a new page, maybe we have just run out
 150          */
 151         int avail = (char*)argp->end - (char*)argp->p;
 152         __be32 *p;
 153         if (avail + argp->pagelen < nbytes)
 154                 return NULL;
 155         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 156                 return NULL;
 157         /* ok, we can do it with the current plus the next page */
 158         if (nbytes <= sizeof(argp->tmp))
 159                 p = argp->tmp;
 160         else {
 161                 kfree(argp->tmpp);
 162                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 163                 if (!p)
 164                         return NULL;
 165
 166         }
 167         memcpy(p, argp->p, avail);
 168         /* step to next page */
 169         argp->p = page_address(argp->pagelist[0]);
 170         argp->pagelist++;
 171         if (argp->pagelen < PAGE_SIZE) {
 172                 argp->end = p + (argp->pagelen>>2);
 173                 argp->pagelen = 0;
 174         } else {
 175                 argp->end = p + (PAGE_SIZE>>2);
 176                 argp->pagelen -= PAGE_SIZE;
 177         }
 178         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 179         argp->p += XDR_QUADLEN(nbytes - avail);
 180         return p;
 181 }
 182
 183 static int
 184 defer_free(struct nfsd4_compoundargs *argp,
 185                 void (*release)(const void *), void *p)
 186 {
 187         struct tmpbuf *tb;
 188
 189         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 190         if (!tb)
 191                 return -ENOMEM;
 192         tb->buf = p;
 193         tb->release = release;
 194         tb->next = argp->to_free;
 195         argp->to_free = tb;
 196         return 0;
 197 }
 198
 199 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 200 {
 201         if (p == argp->tmp) {
 202                 p = kmalloc(nbytes, GFP_KERNEL);
 203                 if (!p)
 204                         return NULL;
 205                 memcpy(p, argp->tmp, nbytes);
 206         } else {
 207                 BUG_ON(p != argp->tmpp);
 208                 argp->tmpp = NULL;
 209         }
 210         if (defer_free(argp, kfree, p)) {
 211                 kfree(p);
 212                 return NULL;
 213         } else
 214                 return (char *)p;
 215 }
 216
 217 static __be32
 218 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 219 {
 220         u32 bmlen;
 221         DECODE_HEAD;
 222
 223         bmval[0] = 0;
 224         bmval[1] = 0;
 225
 226         READ_BUF(4);
 227         READ32(bmlen);
 228         if (bmlen > 1000)
 229                 goto xdr_error;
 230
 231         READ_BUF(bmlen << 2);
 232         if (bmlen > 0)
 233                 READ32(bmval[0]);
 234         if (bmlen > 1)
 235                 READ32(bmval[1]);
 236
 237         DECODE_TAIL;
 238 }
 239
 240 static __be32
 241 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 242     struct nfs4_acl **acl)
 243 {
 244         int expected_len, len = 0;
 245         u32 dummy32;
 246         char *buf;
 247         int host_err;
 248
 249         DECODE_HEAD;
 250         iattr->ia_valid = 0;
 251         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 252                 return status;
 253
 254         /*
 255          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
 256          * read-only attributes return ERR_INVAL.
 257          */
 258         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 259                 return nfserr_attrnotsupp;
 260         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 261                 return nfserr_inval;
 262
 263         READ_BUF(4);
 264         READ32(expected_len);
 265
 266         if (bmval[0] & FATTR4_WORD0_SIZE) {
 267                 READ_BUF(8);
 268                 len += 8;
 269                 READ64(iattr->ia_size);
 270                 iattr->ia_valid |= ATTR_SIZE;
 271         }
 272         if (bmval[0] & FATTR4_WORD0_ACL) {
 273                 int nace;
 274                 struct nfs4_ace *ace;
 275
 276                 READ_BUF(4); len += 4;
 277                 READ32(nace);
 278
 279                 if (nace > NFS4_ACL_MAX)
 280                         return nfserr_resource;
 281
 282                 *acl = nfs4_acl_new(nace);
 283                 if (*acl == NULL) {
 284                         host_err = -ENOMEM;
 285                         goto out_nfserr;
 286                 }
 287                 defer_free(argp, kfree, *acl);
 288
 289                 (*acl)->naces = nace;
 290                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 291                         READ_BUF(16); len += 16;
 292                         READ32(ace->type);
 293                         READ32(ace->flag);
 294                         READ32(ace->access_mask);
 295                         READ32(dummy32);
 296                         READ_BUF(dummy32);
 297                         len += XDR_QUADLEN(dummy32) << 2;
 298                         READMEM(buf, dummy32);
 299                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 300                         host_err = 0;
 301                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 302                                 ace->who = 0;
 303                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 304                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 305                                                 buf, dummy32, &ace->who);
 306                         else
 307                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 308                                                 buf, dummy32, &ace->who);
 309                         if (host_err)
 310                                 goto out_nfserr;
 311                 }
 312         } else
 313                 *acl = NULL;
 314         if (bmval[1] & FATTR4_WORD1_MODE) {
 315                 READ_BUF(4);
 316                 len += 4;
 317                 READ32(iattr->ia_mode);
 318                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 319                 iattr->ia_valid |= ATTR_MODE;
 320         }
 321         if (bmval[1] & FATTR4_WORD1_OWNER) {
 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_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 329                         goto out_nfserr;
 330                 iattr->ia_valid |= ATTR_UID;
 331         }
 332         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 333                 READ_BUF(4);
 334                 len += 4;
 335                 READ32(dummy32);
 336                 READ_BUF(dummy32);
 337                 len += (XDR_QUADLEN(dummy32) << 2);
 338                 READMEM(buf, dummy32);
 339                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 340                         goto out_nfserr;
 341                 iattr->ia_valid |= ATTR_GID;
 342         }
 343         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 344                 READ_BUF(4);
 345                 len += 4;
 346                 READ32(dummy32);
 347                 switch (dummy32) {
 348                 case NFS4_SET_TO_CLIENT_TIME:
 349                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 350                            all 32 bits of 'nseconds'. */
 351                         READ_BUF(12);
 352                         len += 12;
 353                         READ32(dummy32);
 354                         if (dummy32)
 355                                 return nfserr_inval;
 356                         READ32(iattr->ia_atime.tv_sec);
 357                         READ32(iattr->ia_atime.tv_nsec);
 358                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 359                                 return nfserr_inval;
 360                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 361                         break;
 362                 case NFS4_SET_TO_SERVER_TIME:
 363                         iattr->ia_valid |= ATTR_ATIME;
 364                         break;
 365                 default:
 366                         goto xdr_error;
 367                 }
 368         }
 369         if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
 370                 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 371                    all 32 bits of 'nseconds'. */
 372                 READ_BUF(12);
 373                 len += 12;
 374                 READ32(dummy32);
 375                 if (dummy32)
 376                         return nfserr_inval;
 377                 READ32(iattr->ia_ctime.tv_sec);
 378                 READ32(iattr->ia_ctime.tv_nsec);
 379                 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
 380                         return nfserr_inval;
 381                 iattr->ia_valid |= ATTR_CTIME;
 382         }
 383         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 384                 READ_BUF(4);
 385                 len += 4;
 386                 READ32(dummy32);
 387                 switch (dummy32) {
 388                 case NFS4_SET_TO_CLIENT_TIME:
 389                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 390                            all 32 bits of 'nseconds'. */
 391                         READ_BUF(12);
 392                         len += 12;
 393                         READ32(dummy32);
 394                         if (dummy32)
 395                                 return nfserr_inval;
 396                         READ32(iattr->ia_mtime.tv_sec);
 397                         READ32(iattr->ia_mtime.tv_nsec);
 398                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 399                                 return nfserr_inval;
 400                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 401                         break;
 402                 case NFS4_SET_TO_SERVER_TIME:
 403                         iattr->ia_valid |= ATTR_MTIME;
 404                         break;
 405                 default:
 406                         goto xdr_error;
 407                 }
 408         }
 409         if (len != expected_len)
 410                 goto xdr_error;
 411
 412         DECODE_TAIL;
 413
 414 out_nfserr:
 415         status = nfserrno(host_err);
 416         goto out;
 417 }
 418
 419 static __be32
 420 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 421 {
 422         DECODE_HEAD;
 423
 424         READ_BUF(4);
 425         READ32(access->ac_req_access);
 426
 427         DECODE_TAIL;
 428 }
 429
 430 static __be32
 431 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 432 {
 433         DECODE_HEAD;
 434
 435         close->cl_stateowner = NULL;
 436         READ_BUF(4 + sizeof(stateid_t));
 437         READ32(close->cl_seqid);
 438         READ32(close->cl_stateid.si_generation);
 439         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
 440
 441         DECODE_TAIL;
 442 }
 443
 444
 445 static __be32
 446 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 447 {
 448         DECODE_HEAD;
 449
 450         READ_BUF(12);
 451         READ64(commit->co_offset);
 452         READ32(commit->co_count);
 453
 454         DECODE_TAIL;
 455 }
 456
 457 static __be32
 458 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 459 {
 460         DECODE_HEAD;
 461
 462         READ_BUF(4);
 463         READ32(create->cr_type);
 464         switch (create->cr_type) {
 465         case NF4LNK:
 466                 READ_BUF(4);
 467                 READ32(create->cr_linklen);
 468                 READ_BUF(create->cr_linklen);
 469                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 470                 break;
 471         case NF4BLK:
 472         case NF4CHR:
 473                 READ_BUF(8);
 474                 READ32(create->cr_specdata1);
 475                 READ32(create->cr_specdata2);
 476                 break;
 477         case NF4SOCK:
 478         case NF4FIFO:
 479         case NF4DIR:
 480         default:
 481                 break;
 482         }
 483
 484         READ_BUF(4);
 485         READ32(create->cr_namelen);
 486         READ_BUF(create->cr_namelen);
 487         SAVEMEM(create->cr_name, create->cr_namelen);
 488         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 489                 return status;
 490
 491         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 492                 goto out;
 493
 494         DECODE_TAIL;
 495 }
 496
 497 static inline __be32
 498 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 499 {
 500         DECODE_HEAD;
 501
 502         READ_BUF(sizeof(stateid_t));
 503         READ32(dr->dr_stateid.si_generation);
 504         COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
 505
 506         DECODE_TAIL;
 507 }
 508
 509 static inline __be32
 510 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 511 {
 512         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 513 }
 514
 515 static __be32
 516 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 517 {
 518         DECODE_HEAD;
 519
 520         READ_BUF(4);
 521         READ32(link->li_namelen);
 522         READ_BUF(link->li_namelen);
 523         SAVEMEM(link->li_name, link->li_namelen);
 524         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 525                 return status;
 526
 527         DECODE_TAIL;
 528 }
 529
 530 static __be32
 531 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 532 {
 533         DECODE_HEAD;
 534
 535         lock->lk_replay_owner = NULL;
 536         /*
 537         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 538         */
 539         READ_BUF(28);
 540         READ32(lock->lk_type);
 541         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 542                 goto xdr_error;
 543         READ32(lock->lk_reclaim);
 544         READ64(lock->lk_offset);
 545         READ64(lock->lk_length);
 546         READ32(lock->lk_is_new);
 547
 548         if (lock->lk_is_new) {
 549                 READ_BUF(36);
 550                 READ32(lock->lk_new_open_seqid);
 551                 READ32(lock->lk_new_open_stateid.si_generation);
 552
 553                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
 554                 READ32(lock->lk_new_lock_seqid);
 555                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 556                 READ32(lock->lk_new_owner.len);
 557                 READ_BUF(lock->lk_new_owner.len);
 558                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 559         } else {
 560                 READ_BUF(20);
 561                 READ32(lock->lk_old_lock_stateid.si_generation);
 562                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
 563                 READ32(lock->lk_old_lock_seqid);
 564         }
 565
 566         DECODE_TAIL;
 567 }
 568
 569 static __be32
 570 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 571 {
 572         DECODE_HEAD;
 573
 574         READ_BUF(32);
 575         READ32(lockt->lt_type);
 576         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 577                 goto xdr_error;
 578         READ64(lockt->lt_offset);
 579         READ64(lockt->lt_length);
 580         COPYMEM(&lockt->lt_clientid, 8);
 581         READ32(lockt->lt_owner.len);
 582         READ_BUF(lockt->lt_owner.len);
 583         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 584
 585         DECODE_TAIL;
 586 }
 587
 588 static __be32
 589 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 590 {
 591         DECODE_HEAD;
 592
 593         locku->lu_stateowner = NULL;
 594         READ_BUF(24 + sizeof(stateid_t));
 595         READ32(locku->lu_type);
 596         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 597                 goto xdr_error;
 598         READ32(locku->lu_seqid);
 599         READ32(locku->lu_stateid.si_generation);
 600         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
 601         READ64(locku->lu_offset);
 602         READ64(locku->lu_length);
 603
 604         DECODE_TAIL;
 605 }
 606
 607 static __be32
 608 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 609 {
 610         DECODE_HEAD;
 611
 612         READ_BUF(4);
 613         READ32(lookup->lo_len);
 614         READ_BUF(lookup->lo_len);
 615         SAVEMEM(lookup->lo_name, lookup->lo_len);
 616         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 617                 return status;
 618
 619         DECODE_TAIL;
 620 }
 621
 622 static __be32
 623 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 624 {
 625         DECODE_HEAD;
 626
 627         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 628         open->op_iattr.ia_valid = 0;
 629         open->op_stateowner = NULL;
 630
 631         /* seqid, share_access, share_deny, clientid, ownerlen */
 632         READ_BUF(16 + sizeof(clientid_t));
 633         READ32(open->op_seqid);
 634         READ32(open->op_share_access);
 635         READ32(open->op_share_deny);
 636         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 637         READ32(open->op_owner.len);
 638
 639         /* owner, open_flag */
 640         READ_BUF(open->op_owner.len + 4);
 641         SAVEMEM(open->op_owner.data, open->op_owner.len);
 642         READ32(open->op_create);
 643         switch (open->op_create) {
 644         case NFS4_OPEN_NOCREATE:
 645                 break;
 646         case NFS4_OPEN_CREATE:
 647                 READ_BUF(4);
 648                 READ32(open->op_createmode);
 649                 switch (open->op_createmode) {
 650                 case NFS4_CREATE_UNCHECKED:
 651                 case NFS4_CREATE_GUARDED:
 652                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 653                                 goto out;
 654                         break;
 655                 case NFS4_CREATE_EXCLUSIVE:
 656                         READ_BUF(8);
 657                         COPYMEM(open->op_verf.data, 8);
 658                         break;
 659                 default:
 660                         goto xdr_error;
 661                 }
 662                 break;
 663         default:
 664                 goto xdr_error;
 665         }
 666
 667         /* open_claim */
 668         READ_BUF(4);
 669         READ32(open->op_claim_type);
 670         switch (open->op_claim_type) {
 671         case NFS4_OPEN_CLAIM_NULL:
 672         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 673                 READ_BUF(4);
 674                 READ32(open->op_fname.len);
 675                 READ_BUF(open->op_fname.len);
 676                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 677                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 678                         return status;
 679                 break;
 680         case NFS4_OPEN_CLAIM_PREVIOUS:
 681                 READ_BUF(4);
 682                 READ32(open->op_delegate_type);
 683                 break;
 684         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 685                 READ_BUF(sizeof(stateid_t) + 4);
 686                 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
 687                 READ32(open->op_fname.len);
 688                 READ_BUF(open->op_fname.len);
 689                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 690                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 691                         return status;
 692                 break;
 693         default:
 694                 goto xdr_error;
 695         }
 696
 697         DECODE_TAIL;
 698 }
 699
 700 static __be32
 701 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 702 {
 703         DECODE_HEAD;
 704
 705         open_conf->oc_stateowner = NULL;
 706         READ_BUF(4 + sizeof(stateid_t));
 707         READ32(open_conf->oc_req_stateid.si_generation);
 708         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
 709         READ32(open_conf->oc_seqid);
 710
 711         DECODE_TAIL;
 712 }
 713
 714 static __be32
 715 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 716 {
 717         DECODE_HEAD;
 718
 719         open_down->od_stateowner = NULL;
 720         READ_BUF(12 + sizeof(stateid_t));
 721         READ32(open_down->od_stateid.si_generation);
 722         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
 723         READ32(open_down->od_seqid);
 724         READ32(open_down->od_share_access);
 725         READ32(open_down->od_share_deny);
 726
 727         DECODE_TAIL;
 728 }
 729
 730 static __be32
 731 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 732 {
 733         DECODE_HEAD;
 734
 735         READ_BUF(4);
 736         READ32(putfh->pf_fhlen);
 737         if (putfh->pf_fhlen > NFS4_FHSIZE)
 738                 goto xdr_error;
 739         READ_BUF(putfh->pf_fhlen);
 740         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 741
 742         DECODE_TAIL;
 743 }
 744
 745 static __be32
 746 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 747 {
 748         DECODE_HEAD;
 749
 750         READ_BUF(sizeof(stateid_t) + 12);
 751         READ32(read->rd_stateid.si_generation);
 752         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
 753         READ64(read->rd_offset);
 754         READ32(read->rd_length);
 755
 756         DECODE_TAIL;
 757 }
 758
 759 static __be32
 760 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 761 {
 762         DECODE_HEAD;
 763
 764         READ_BUF(24);
 765         READ64(readdir->rd_cookie);
 766         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 767         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 768         READ32(readdir->rd_maxcount);
 769         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 770                 goto out;
 771
 772         DECODE_TAIL;
 773 }
 774
 775 static __be32
 776 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 777 {
 778         DECODE_HEAD;
 779
 780         READ_BUF(4);
 781         READ32(remove->rm_namelen);
 782         READ_BUF(remove->rm_namelen);
 783         SAVEMEM(remove->rm_name, remove->rm_namelen);
 784         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 785                 return status;
 786
 787         DECODE_TAIL;
 788 }
 789
 790 static __be32
 791 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 792 {
 793         DECODE_HEAD;
 794
 795         READ_BUF(4);
 796         READ32(rename->rn_snamelen);
 797         READ_BUF(rename->rn_snamelen + 4);
 798         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 799         READ32(rename->rn_tnamelen);
 800         READ_BUF(rename->rn_tnamelen);
 801         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 802         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 803                 return status;
 804         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 805                 return status;
 806
 807         DECODE_TAIL;
 808 }
 809
 810 static __be32
 811 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 812 {
 813         DECODE_HEAD;
 814
 815         READ_BUF(sizeof(clientid_t));
 816         COPYMEM(clientid, sizeof(clientid_t));
 817
 818         DECODE_TAIL;
 819 }
 820
 821 static __be32
 822 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 823 {
 824         DECODE_HEAD;
 825
 826         READ_BUF(sizeof(stateid_t));
 827         READ32(setattr->sa_stateid.si_generation);
 828         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 829         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 830                 goto out;
 831
 832         DECODE_TAIL;
 833 }
 834
 835 static __be32
 836 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 837 {
 838         DECODE_HEAD;
 839
 840         READ_BUF(12);
 841         COPYMEM(setclientid->se_verf.data, 8);
 842         READ32(setclientid->se_namelen);
 843
 844         READ_BUF(setclientid->se_namelen + 8);
 845         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 846         READ32(setclientid->se_callback_prog);
 847         READ32(setclientid->se_callback_netid_len);
 848
 849         READ_BUF(setclientid->se_callback_netid_len + 4);
 850         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 851         READ32(setclientid->se_callback_addr_len);
 852
 853         READ_BUF(setclientid->se_callback_addr_len + 4);
 854         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 855         READ32(setclientid->se_callback_ident);
 856
 857         DECODE_TAIL;
 858 }
 859
 860 static __be32
 861 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 862 {
 863         DECODE_HEAD;
 864
 865         READ_BUF(8 + sizeof(nfs4_verifier));
 866         COPYMEM(&scd_c->sc_clientid, 8);
 867         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 868
 869         DECODE_TAIL;
 870 }
 871
 872 /* Also used for NVERIFY */
 873 static __be32
 874 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 875 {
 876 #if 0
 877         struct nfsd4_compoundargs save = {
 878                 .p = argp->p,
 879                 .end = argp->end,
 880                 .rqstp = argp->rqstp,
 881         };
 882         u32             ve_bmval[2];
 883         struct iattr    ve_iattr;           /* request */
 884         struct nfs4_acl *ve_acl;            /* request */
 885 #endif
 886         DECODE_HEAD;
 887
 888         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 889                 goto out;
 890
 891         /* For convenience's sake, we compare raw xdr'd attributes in
 892          * nfsd4_proc_verify; however we still decode here just to return
 893          * correct error in case of bad xdr. */
 894 #if 0
 895         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 896         if (status == nfserr_inval) {
 897                 status = nfserrno(status);
 898                 goto out;
 899         }
 900 #endif
 901         READ_BUF(4);
 902         READ32(verify->ve_attrlen);
 903         READ_BUF(verify->ve_attrlen);
 904         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 905
 906         DECODE_TAIL;
 907 }
 908
 909 static __be32
 910 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 911 {
 912         int avail;
 913         int v;
 914         int len;
 915         DECODE_HEAD;
 916
 917         READ_BUF(sizeof(stateid_opaque_t) + 20);
 918         READ32(write->wr_stateid.si_generation);
 919         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
 920         READ64(write->wr_offset);
 921         READ32(write->wr_stable_how);
 922         if (write->wr_stable_how > 2)
 923                 goto xdr_error;
 924         READ32(write->wr_buflen);
 925
 926         /* Sorry .. no magic macros for this.. *
 927          * READ_BUF(write->wr_buflen);
 928          * SAVEMEM(write->wr_buf, write->wr_buflen);
 929          */
 930         avail = (char*)argp->end - (char*)argp->p;
 931         if (avail + argp->pagelen < write->wr_buflen) {
 932                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__);
 933                 goto xdr_error;
 934         }
 935         argp->rqstp->rq_vec[0].iov_base = p;
 936         argp->rqstp->rq_vec[0].iov_len = avail;
 937         v = 0;
 938         len = write->wr_buflen;
 939         while (len > argp->rqstp->rq_vec[v].iov_len) {
 940                 len -= argp->rqstp->rq_vec[v].iov_len;
 941                 v++;
 942                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 943                 argp->pagelist++;
 944                 if (argp->pagelen >= PAGE_SIZE) {
 945                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 946                         argp->pagelen -= PAGE_SIZE;
 947                 } else {
 948                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 949                         argp->pagelen -= len;
 950                 }
 951         }
 952         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 953         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 954         argp->rqstp->rq_vec[v].iov_len = len;
 955         write->wr_vlen = v+1;
 956
 957         DECODE_TAIL;
 958 }
 959
 960 static __be32
 961 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 962 {
 963         DECODE_HEAD;
 964
 965         READ_BUF(12);
 966         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 967         READ32(rlockowner->rl_owner.len);
 968         READ_BUF(rlockowner->rl_owner.len);
 969         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 970
 971         DECODE_TAIL;
 972 }
 973
 974 static __be32
 975 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 976 {
 977         DECODE_HEAD;
 978         struct nfsd4_op *op;
 979         int i;
 980
 981         /*
 982          * XXX: According to spec, we should check the tag
 983          * for UTF-8 compliance.  I'm postponing this for
 984          * now because it seems that some clients do use
 985          * binary tags.
 986          */
 987         READ_BUF(4);
 988         READ32(argp->taglen);
 989         READ_BUF(argp->taglen + 8);
 990         SAVEMEM(argp->tag, argp->taglen);
 991         READ32(argp->minorversion);
 992         READ32(argp->opcnt);
 993
 994         if (argp->taglen > NFSD4_MAX_TAGLEN)
 995                 goto xdr_error;
 996         if (argp->opcnt > 100)
 997                 goto xdr_error;
 998
 999         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1000                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1001                 if (!argp->ops) {
1002                         argp->ops = argp->iops;
1003                         printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
1004                         goto xdr_error;
1005                 }
1006         }
1007
1008         for (i = 0; i < argp->opcnt; i++) {
1009                 op = &argp->ops[i];
1010                 op->replay = NULL;
1011
1012                 /*
1013                  * We can't use READ_BUF() here because we need to handle
1014                  * a missing opcode as an OP_WRITE + 1. So we need to check
1015                  * to see if we're truly at the end of our buffer or if there
1016                  * is another page we need to flip to.
1017                  */
1018
1019                 if (argp->p == argp->end) {
1020                         if (argp->pagelen < 4) {
1021                                 /* There isn't an opcode still on the wire */
1022                                 op->opnum = OP_WRITE + 1;
1023                                 op->status = nfserr_bad_xdr;
1024                                 argp->opcnt = i+1;
1025                                 break;
1026                         }
1027
1028                         /*
1029                          * False alarm. We just hit a page boundary, but there
1030                          * is still data available.  Move pointer across page
1031                          * boundary.  *snip from READ_BUF*
1032                          */
1033                         argp->p = page_address(argp->pagelist[0]);
1034                         argp->pagelist++;
1035                         if (argp->pagelen < PAGE_SIZE) {
1036                                 argp->end = p + (argp->pagelen>>2);
1037                                 argp->pagelen = 0;
1038                         } else {
1039                                 argp->end = p + (PAGE_SIZE>>2);
1040                                 argp->pagelen -= PAGE_SIZE;
1041                         }
1042                 }
1043                 op->opnum = ntohl(*argp->p++);
1044
1045                 switch (op->opnum) {
1046                 case 2: /* Reserved operation */
1047                         op->opnum = OP_ILLEGAL;
1048                         if (argp->minorversion == 0)
1049                                 op->status = nfserr_op_illegal;
1050                         else
1051                                 op->status = nfserr_minor_vers_mismatch;
1052                         break;
1053                 case OP_ACCESS:
1054                         op->status = nfsd4_decode_access(argp, &op->u.access);
1055                         break;
1056                 case OP_CLOSE:
1057                         op->status = nfsd4_decode_close(argp, &op->u.close);
1058                         break;
1059                 case OP_COMMIT:
1060                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1061                         break;
1062                 case OP_CREATE:
1063                         op->status = nfsd4_decode_create(argp, &op->u.create);
1064                         break;
1065                 case OP_DELEGRETURN:
1066                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1067                         break;
1068                 case OP_GETATTR:
1069                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1070                         break;
1071                 case OP_GETFH:
1072                         op->status = nfs_ok;
1073                         break;
1074                 case OP_LINK:
1075                         op->status = nfsd4_decode_link(argp, &op->u.link);
1076                         break;
1077                 case OP_LOCK:
1078                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1079                         break;
1080                 case OP_LOCKT:
1081                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1082                         break;
1083                 case OP_LOCKU:
1084                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1085                         break;
1086                 case OP_LOOKUP:
1087                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1088                         break;
1089                 case OP_LOOKUPP:
1090                         op->status = nfs_ok;
1091                         break;
1092                 case OP_NVERIFY:
1093                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1094                         break;
1095                 case OP_OPEN:
1096                         op->status = nfsd4_decode_open(argp, &op->u.open);
1097                         break;
1098                 case OP_OPEN_CONFIRM:
1099                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1100                         break;
1101                 case OP_OPEN_DOWNGRADE:
1102                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1103                         break;
1104                 case OP_PUTFH:
1105                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1106                         break;
1107                 case OP_PUTROOTFH:
1108                         op->status = nfs_ok;
1109                         break;
1110                 case OP_READ:
1111                         op->status = nfsd4_decode_read(argp, &op->u.read);
1112                         break;
1113                 case OP_READDIR:
1114                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1115                         break;
1116                 case OP_READLINK:
1117                         op->status = nfs_ok;
1118                         break;
1119                 case OP_REMOVE:
1120                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1121                         break;
1122                 case OP_RENAME:
1123                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1124                         break;
1125                 case OP_RESTOREFH:
1126                         op->status = nfs_ok;
1127                         break;
1128                 case OP_RENEW:
1129                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1130                         break;
1131                 case OP_SAVEFH:
1132                         op->status = nfs_ok;
1133                         break;
1134                 case OP_SETATTR:
1135                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1136                         break;
1137                 case OP_SETCLIENTID:
1138                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1139                         break;
1140                 case OP_SETCLIENTID_CONFIRM:
1141                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1142                         break;
1143                 case OP_VERIFY:
1144                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1145                         break;
1146                 case OP_WRITE:
1147                         op->status = nfsd4_decode_write(argp, &op->u.write);
1148                         break;
1149                 case OP_RELEASE_LOCKOWNER:
1150                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1151                         break;
1152                 default:
1153                         op->opnum = OP_ILLEGAL;
1154                         op->status = nfserr_op_illegal;
1155                         break;
1156                 }
1157
1158                 if (op->status) {
1159                         argp->opcnt = i+1;
1160                         break;
1161                 }
1162         }
1163
1164         DECODE_TAIL;
1165 }
1166 /*
1167  * END OF "GENERIC" DECODE ROUTINES.
1168  */
1169
1170 /*
1171  * START OF "GENERIC" ENCODE ROUTINES.
1172  *   These may look a little ugly since they are imported from a "generic"
1173  * set of XDR encode/decode routines which are intended to be shared by
1174  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1175  *
1176  * If the pain of reading these is too great, it should be a straightforward
1177  * task to translate them into Linux-specific versions which are more
1178  * consistent with the style used in NFSv2/v3...
1179  */
1180 #define ENCODE_HEAD              __be32 *p
1181
1182 #define WRITE32(n)               *p++ = htonl(n)
1183 #define WRITE64(n)               do {                           \
1184         *p++ = htonl((u32)((n) >> 32));                         \
1185         *p++ = htonl((u32)(n));                                 \
1186 } while (0)
1187 #define WRITEMEM(ptr,nbytes)     do {                           \
1188         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1189         memcpy(p, ptr, nbytes);                                 \
1190         p += XDR_QUADLEN(nbytes);                               \
1191 } while (0)
1192 #define WRITECINFO(c)           do {                            \
1193         *p++ = htonl(c.atomic);                                 \
1194         *p++ = htonl(c.before_ctime_sec);                               \
1195         *p++ = htonl(c.before_ctime_nsec);                              \
1196         *p++ = htonl(c.after_ctime_sec);                                \
1197         *p++ = htonl(c.after_ctime_nsec);                               \
1198 } while (0)
1199
1200 #define RESERVE_SPACE(nbytes)   do {                            \
1201         p = resp->p;                                            \
1202         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1203 } while (0)
1204 #define ADJUST_ARGS()           resp->p = p
1205
1206 /*
1207  * Header routine to setup seqid operation replay cache
1208  */
1209 #define ENCODE_SEQID_OP_HEAD                                    \
1210         __be32 *p;                                              \
1211         __be32 *save;                                           \
1212                                                                 \
1213         save = resp->p;
1214
1215 /*
1216  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1217  * is where sequence id's are incremented, and the replay cache is filled.
1218  * Note that we increment sequence id's here, at the last moment, so we're sure
1219  * we know whether the error to be returned is a sequence id mutating error.
1220  */
1221
1222 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1223         if (seqid_mutating_err(nfserr) && stateowner) {         \
1224                 stateowner->so_seqid++;                         \
1225                 stateowner->so_replay.rp_status = nfserr;       \
1226                 stateowner->so_replay.rp_buflen =               \
1227                           (((char *)(resp)->p - (char *)save)); \
1228                 memcpy(stateowner->so_replay.rp_buf, save,      \
1229                         stateowner->so_replay.rp_buflen);       \
1230         } } while (0);
1231
1232 /* Encode as an array of strings the string given with components
1233  * seperated @sep.
1234  */
1235 static __be32 nfsd4_encode_components(char sep, char *components,
1236                                    __be32 **pp, int *buflen)
1237 {
1238         __be32 *p = *pp;
1239         __be32 *countp = p;
1240         int strlen, count=0;
1241         char *str, *end;
1242
1243         dprintk("nfsd4_encode_components(%s)\n", components);
1244         if ((*buflen -= 4) < 0)
1245                 return nfserr_resource;
1246         WRITE32(0); /* We will fill this in with @count later */
1247         end = str = components;
1248         while (*end) {
1249                 for (; *end && (*end != sep); end++)
1250                         ; /* Point to end of component */
1251                 strlen = end - str;
1252                 if (strlen) {
1253                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1254                                 return nfserr_resource;
1255                         WRITE32(strlen);
1256                         WRITEMEM(str, strlen);
1257                         count++;
1258                 }
1259                 else
1260                         end++;
1261                 str = end;
1262         }
1263         *pp = p;
1264         p = countp;
1265         WRITE32(count);
1266         return 0;
1267 }
1268
1269 /*
1270  * encode a location element of a fs_locations structure
1271  */
1272 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1273                                     __be32 **pp, int *buflen)
1274 {
1275         __be32 status;
1276         __be32 *p = *pp;
1277
1278         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1279         if (status)
1280                 return status;
1281         status = nfsd4_encode_components('/', location->path, &p, buflen);
1282         if (status)
1283                 return status;
1284         *pp = p;
1285         return 0;
1286 }
1287
1288 /*
1289  * Return the path to an export point in the pseudo filesystem namespace
1290  * Returned string is safe to use as long as the caller holds a reference
1291  * to @exp.
1292  */
1293 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1294 {
1295         struct svc_fh tmp_fh;
1296         char *path, *rootpath;
1297
1298         fh_init(&tmp_fh, NFS4_FHSIZE);
1299         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1300         if (*stat)
1301                 return NULL;
1302         rootpath = tmp_fh.fh_export->ex_path;
1303
1304         path = exp->ex_path;
1305
1306         if (strncmp(path, rootpath, strlen(rootpath))) {
1307                 printk("nfsd: fs_locations failed;"
1308                         "%s is not contained in %s\n", path, rootpath);
1309                 *stat = nfserr_notsupp;
1310                 return NULL;
1311         }
1312
1313         return path + strlen(rootpath);
1314 }
1315
1316 /*
1317  *  encode a fs_locations structure
1318  */
1319 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1320                                      struct svc_export *exp,
1321                                      __be32 **pp, int *buflen)
1322 {
1323         __be32 status;
1324         int i;
1325         __be32 *p = *pp;
1326         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1327         char *root = nfsd4_path(rqstp, exp, &status);
1328
1329         if (status)
1330                 return status;
1331         status = nfsd4_encode_components('/', root, &p, buflen);
1332         if (status)
1333                 return status;
1334         if ((*buflen -= 4) < 0)
1335                 return nfserr_resource;
1336         WRITE32(fslocs->locations_count);
1337         for (i=0; i<fslocs->locations_count; i++) {
1338                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1339                                                    &p, buflen);
1340                 if (status)
1341                         return status;
1342         }
1343         *pp = p;
1344         return 0;
1345 }
1346
1347 static u32 nfs4_ftypes[16] = {
1348         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1349         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1350         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1351         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1352 };
1353
1354 static __be32
1355 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1356                         __be32 **p, int *buflen)
1357 {
1358         int status;
1359
1360         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1361                 return nfserr_resource;
1362         if (whotype != NFS4_ACL_WHO_NAMED)
1363                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1364         else if (group)
1365                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1366         else
1367                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1368         if (status < 0)
1369                 return nfserrno(status);
1370         *p = xdr_encode_opaque(*p, NULL, status);
1371         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1372         BUG_ON(*buflen < 0);
1373         return 0;
1374 }
1375
1376 static inline __be32
1377 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1378 {
1379         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1380 }
1381
1382 static inline __be32
1383 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1384 {
1385         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1386 }
1387
1388 static inline __be32
1389 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1390                 __be32 **p, int *buflen)
1391 {
1392         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1393 }
1394
1395 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1396                               FATTR4_WORD0_RDATTR_ERROR)
1397 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1398
1399 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1400 {
1401         /* As per referral draft:  */
1402         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1403             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1404                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1405                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1406                         *rdattr_err = NFSERR_MOVED;
1407                 else
1408                         return nfserr_moved;
1409         }
1410         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1411         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1412         return 0;
1413 }
1414
1415 /*
1416  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1417  * ourselves.
1418  *
1419  * @countp is the buffer size in _words_; upon successful return this becomes
1420  * replaced with the number of words written.
1421  */
1422 __be32
1423 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1424                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1425                 struct svc_rqst *rqstp)
1426 {
1427         u32 bmval0 = bmval[0];
1428         u32 bmval1 = bmval[1];
1429         struct kstat stat;
1430         struct svc_fh tempfh;
1431         struct kstatfs statfs;
1432         int buflen = *countp << 2;
1433         __be32 *attrlenp;
1434         u32 dummy;
1435         u64 dummy64;
1436         u32 rdattr_err = 0;
1437         __be32 *p = buffer;
1438         __be32 status;
1439         int err;
1440         int aclsupport = 0;
1441         struct nfs4_acl *acl = NULL;
1442
1443         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1444         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1445         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1446
1447         if (exp->ex_fslocs.migrated) {
1448                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1449                 if (status)
1450                         goto out;
1451         }
1452
1453         err = vfs_getattr(exp->ex_mnt, dentry, &stat);
1454         if (err)
1455                 goto out_nfserr;
1456         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1457             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1458                        FATTR4_WORD1_SPACE_TOTAL))) {
1459                 err = vfs_statfs(dentry, &statfs);
1460                 if (err)
1461                         goto out_nfserr;
1462         }
1463         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1464                 fh_init(&tempfh, NFS4_FHSIZE);
1465                 status = fh_compose(&tempfh, exp, dentry, NULL);
1466                 if (status)
1467                         goto out;
1468                 fhp = &tempfh;
1469         }
1470         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1471                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1472                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1473                 aclsupport = (err == 0);
1474                 if (bmval0 & FATTR4_WORD0_ACL) {
1475                         if (err == -EOPNOTSUPP)
1476                                 bmval0 &= ~FATTR4_WORD0_ACL;
1477                         else if (err == -EINVAL) {
1478                                 status = nfserr_attrnotsupp;
1479                                 goto out;
1480                         } else if (err != 0)
1481                                 goto out_nfserr;
1482                 }
1483         }
1484         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1485                 if (exp->ex_fslocs.locations == NULL) {
1486                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1487                 }
1488         }
1489         if ((buflen -= 16) < 0)
1490                 goto out_resource;
1491
1492         WRITE32(2);
1493         WRITE32(bmval0);
1494         WRITE32(bmval1);
1495         attrlenp = p++;                /* to be backfilled later */
1496
1497         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1498                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1499                 if ((buflen -= 12) < 0)
1500                         goto out_resource;
1501                 if (!aclsupport)
1502                         word0 &= ~FATTR4_WORD0_ACL;
1503                 if (!exp->ex_fslocs.locations)
1504                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1505                 WRITE32(2);
1506                 WRITE32(word0);
1507                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1508         }
1509         if (bmval0 & FATTR4_WORD0_TYPE) {
1510                 if ((buflen -= 4) < 0)
1511                         goto out_resource;
1512                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1513                 if (dummy == NF4BAD)
1514                         goto out_serverfault;
1515                 WRITE32(dummy);
1516         }
1517         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1518                 if ((buflen -= 4) < 0)
1519                         goto out_resource;
1520                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1521                         WRITE32(NFS4_FH_PERSISTENT);
1522                 else
1523                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1524         }
1525         if (bmval0 & FATTR4_WORD0_CHANGE) {
1526                 /*
1527                  * Note: This _must_ be consistent with the scheme for writing
1528                  * change_info, so any changes made here must be reflected there
1529                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1530                  * macro above.)
1531                  */
1532                 if ((buflen -= 8) < 0)
1533                         goto out_resource;
1534                 WRITE32(stat.ctime.tv_sec);
1535                 WRITE32(stat.ctime.tv_nsec);
1536         }
1537         if (bmval0 & FATTR4_WORD0_SIZE) {
1538                 if ((buflen -= 8) < 0)
1539                         goto out_resource;
1540                 WRITE64(stat.size);
1541         }
1542         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1543                 if ((buflen -= 4) < 0)
1544                         goto out_resource;
1545                 WRITE32(1);
1546         }
1547         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1548                 if ((buflen -= 4) < 0)
1549                         goto out_resource;
1550                 WRITE32(1);
1551         }
1552         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1553                 if ((buflen -= 4) < 0)
1554                         goto out_resource;
1555                 WRITE32(0);
1556         }
1557         if (bmval0 & FATTR4_WORD0_FSID) {
1558                 if ((buflen -= 16) < 0)
1559                         goto out_resource;
1560                 if (exp->ex_fslocs.migrated) {
1561                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1562                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1563                 } else switch(fsid_source(fhp)) {
1564                 case FSIDSOURCE_FSID:
1565                         WRITE64((u64)exp->ex_fsid);
1566                         WRITE64((u64)0);
1567                         break;
1568                 case FSIDSOURCE_DEV:
1569                         WRITE32(0);
1570                         WRITE32(MAJOR(stat.dev));
1571                         WRITE32(0);
1572                         WRITE32(MINOR(stat.dev));
1573                         break;
1574                 case FSIDSOURCE_UUID:
1575                         WRITEMEM(exp->ex_uuid, 16);
1576                         break;
1577                 }
1578         }
1579         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1580                 if ((buflen -= 4) < 0)
1581                         goto out_resource;
1582                 WRITE32(0);
1583         }
1584         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1585                 if ((buflen -= 4) < 0)
1586                         goto out_resource;
1587                 WRITE32(NFSD_LEASE_TIME);
1588         }
1589         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1590                 if ((buflen -= 4) < 0)
1591                         goto out_resource;
1592                 WRITE32(rdattr_err);
1593         }
1594         if (bmval0 & FATTR4_WORD0_ACL) {
1595                 struct nfs4_ace *ace;
1596
1597                 if (acl == NULL) {
1598                         if ((buflen -= 4) < 0)
1599                                 goto out_resource;
1600
1601                         WRITE32(0);
1602                         goto out_acl;
1603                 }
1604                 if ((buflen -= 4) < 0)
1605                         goto out_resource;
1606                 WRITE32(acl->naces);
1607
1608                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1609                         if ((buflen -= 4*3) < 0)
1610                                 goto out_resource;
1611                         WRITE32(ace->type);
1612                         WRITE32(ace->flag);
1613                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1614                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1615                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1616                                 &p, &buflen);
1617                         if (status == nfserr_resource)
1618                                 goto out_resource;
1619                         if (status)
1620                                 goto out;
1621                 }
1622         }
1623 out_acl:
1624         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1625                 if ((buflen -= 4) < 0)
1626                         goto out_resource;
1627                 WRITE32(aclsupport ?
1628                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1629         }
1630         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1631                 if ((buflen -= 4) < 0)
1632                         goto out_resource;
1633                 WRITE32(1);
1634         }
1635         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1636                 if ((buflen -= 4) < 0)
1637                         goto out_resource;
1638                 WRITE32(1);
1639         }
1640         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1641                 if ((buflen -= 4) < 0)
1642                         goto out_resource;
1643                 WRITE32(1);
1644         }
1645         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1646                 if ((buflen -= 4) < 0)
1647                         goto out_resource;
1648                 WRITE32(1);
1649         }
1650         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1651                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1652                 if (buflen < 0)
1653                         goto out_resource;
1654                 WRITE32(fhp->fh_handle.fh_size);
1655                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1656         }
1657         if (bmval0 & FATTR4_WORD0_FILEID) {
1658                 if ((buflen -= 8) < 0)
1659                         goto out_resource;
1660                 WRITE64((u64) stat.ino);
1661         }
1662         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1663                 if ((buflen -= 8) < 0)
1664                         goto out_resource;
1665                 WRITE64((u64) statfs.f_ffree);
1666         }
1667         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1668                 if ((buflen -= 8) < 0)
1669                         goto out_resource;
1670                 WRITE64((u64) statfs.f_ffree);
1671         }
1672         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1673                 if ((buflen -= 8) < 0)
1674                         goto out_resource;
1675                 WRITE64((u64) statfs.f_files);
1676         }
1677         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1678                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1679                 if (status == nfserr_resource)
1680                         goto out_resource;
1681                 if (status)
1682                         goto out;
1683         }
1684         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1685                 if ((buflen -= 4) < 0)
1686                         goto out_resource;
1687                 WRITE32(1);
1688         }
1689         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1690                 if ((buflen -= 8) < 0)
1691                         goto out_resource;
1692                 WRITE64(~(u64)0);
1693         }
1694         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1695                 if ((buflen -= 4) < 0)
1696                         goto out_resource;
1697                 WRITE32(255);
1698         }
1699         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1700                 if ((buflen -= 4) < 0)
1701                         goto out_resource;
1702                 WRITE32(~(u32) 0);
1703         }
1704         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1705                 if ((buflen -= 8) < 0)
1706                         goto out_resource;
1707                 WRITE64((u64) svc_max_payload(rqstp));
1708         }
1709         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1710                 if ((buflen -= 8) < 0)
1711                         goto out_resource;
1712                 WRITE64((u64) svc_max_payload(rqstp));
1713         }
1714         if (bmval1 & FATTR4_WORD1_MODE) {
1715                 if ((buflen -= 4) < 0)
1716                         goto out_resource;
1717                 WRITE32(stat.mode & S_IALLUGO);
1718         }
1719         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1720                 if ((buflen -= 4) < 0)
1721                         goto out_resource;
1722                 WRITE32(1);
1723         }
1724         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1725                 if ((buflen -= 4) < 0)
1726                         goto out_resource;
1727                 WRITE32(stat.nlink);
1728         }
1729         if (bmval1 & FATTR4_WORD1_OWNER) {
1730                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1731                 if (status == nfserr_resource)
1732                         goto out_resource;
1733                 if (status)
1734                         goto out;
1735         }
1736         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1737                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1738                 if (status == nfserr_resource)
1739                         goto out_resource;
1740                 if (status)
1741                         goto out;
1742         }
1743         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1744                 if ((buflen -= 8) < 0)
1745                         goto out_resource;
1746                 WRITE32((u32) MAJOR(stat.rdev));
1747                 WRITE32((u32) MINOR(stat.rdev));
1748         }
1749         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1750                 if ((buflen -= 8) < 0)
1751                         goto out_resource;
1752                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1753                 WRITE64(dummy64);
1754         }
1755         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1756                 if ((buflen -= 8) < 0)
1757                         goto out_resource;
1758                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1759                 WRITE64(dummy64);
1760         }
1761         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1762                 if ((buflen -= 8) < 0)
1763                         goto out_resource;
1764                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1765                 WRITE64(dummy64);
1766         }
1767         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1768                 if ((buflen -= 8) < 0)
1769                         goto out_resource;
1770                 dummy64 = (u64)stat.blocks << 9;
1771                 WRITE64(dummy64);
1772         }
1773         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1774                 if ((buflen -= 12) < 0)
1775                         goto out_resource;
1776                 WRITE32(0);
1777                 WRITE32(stat.atime.tv_sec);
1778                 WRITE32(stat.atime.tv_nsec);
1779         }
1780         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1781                 if ((buflen -= 12) < 0)
1782                         goto out_resource;
1783                 WRITE32(0);
1784                 WRITE32(1);
1785                 WRITE32(0);
1786         }
1787         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1788                 if ((buflen -= 12) < 0)
1789                         goto out_resource;
1790                 WRITE32(0);
1791                 WRITE32(stat.ctime.tv_sec);
1792                 WRITE32(stat.ctime.tv_nsec);
1793         }
1794         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1795                 if ((buflen -= 12) < 0)
1796                         goto out_resource;
1797                 WRITE32(0);
1798                 WRITE32(stat.mtime.tv_sec);
1799                 WRITE32(stat.mtime.tv_nsec);
1800         }
1801         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1802                 struct dentry *mnt_pnt, *mnt_root;
1803
1804                 if ((buflen -= 8) < 0)
1805                         goto out_resource;
1806                 mnt_root = exp->ex_mnt->mnt_root;
1807                 if (mnt_root->d_inode == dentry->d_inode) {
1808                         mnt_pnt = exp->ex_mnt->mnt_mountpoint;
1809                         WRITE64((u64) mnt_pnt->d_inode->i_ino);
1810                 } else
1811                         WRITE64((u64) stat.ino);
1812         }
1813         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1814         *countp = p - buffer;
1815         status = nfs_ok;
1816
1817 out:
1818         kfree(acl);
1819         if (fhp == &tempfh)
1820                 fh_put(&tempfh);
1821         return status;
1822 out_nfserr:
1823         status = nfserrno(err);
1824         goto out;
1825 out_resource:
1826         *countp = 0;
1827         status = nfserr_resource;
1828         goto out;
1829 out_serverfault:
1830         status = nfserr_serverfault;
1831         goto out;
1832 }
1833
1834 static __be32
1835 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1836                 const char *name, int namlen, __be32 *p, int *buflen)
1837 {
1838         struct svc_export *exp = cd->rd_fhp->fh_export;
1839         struct dentry *dentry;
1840         __be32 nfserr;
1841
1842         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1843         if (IS_ERR(dentry))
1844                 return nfserrno(PTR_ERR(dentry));
1845
1846         exp_get(exp);
1847         if (d_mountpoint(dentry)) {
1848                 int err;
1849
1850                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1851                 if (err) {
1852                         nfserr = nfserrno(err);
1853                         goto out_put;
1854                 }
1855
1856         }
1857         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1858                                         cd->rd_rqstp);
1859 out_put:
1860         dput(dentry);
1861         exp_put(exp);
1862         return nfserr;
1863 }
1864
1865 static __be32 *
1866 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1867 {
1868         __be32 *attrlenp;
1869
1870         if (buflen < 6)
1871                 return NULL;
1872         *p++ = htonl(2);
1873         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1874         *p++ = htonl(0);                         /* bmval1 */
1875
1876         attrlenp = p++;
1877         *p++ = nfserr;       /* no htonl */
1878         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1879         return p;
1880 }
1881
1882 static int
1883 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1884                     loff_t offset, u64 ino, unsigned int d_type)
1885 {
1886         struct readdir_cd *ccd = ccdv;
1887         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1888         int buflen;
1889         __be32 *p = cd->buffer;
1890         __be32 nfserr = nfserr_toosmall;
1891
1892         /* In nfsv4, "." and ".." never make it onto the wire.. */
1893         if (name && isdotent(name, namlen)) {
1894                 cd->common.err = nfs_ok;
1895                 return 0;
1896         }
1897
1898         if (cd->offset)
1899                 xdr_encode_hyper(cd->offset, (u64) offset);
1900
1901         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1902         if (buflen < 0)
1903                 goto fail;
1904
1905         *p++ = xdr_one;                             /* mark entry present */
1906         cd->offset = p;                             /* remember pointer */
1907         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1908         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1909
1910         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1911         switch (nfserr) {
1912         case nfs_ok:
1913                 p += buflen;
1914                 break;
1915         case nfserr_resource:
1916                 nfserr = nfserr_toosmall;
1917                 goto fail;
1918         case nfserr_dropit:
1919                 goto fail;
1920         default:
1921                 /*
1922                  * If the client requested the RDATTR_ERROR attribute,
1923                  * we stuff the error code into this attribute
1924                  * and continue.  If this attribute was not requested,
1925                  * then in accordance with the spec, we fail the
1926                  * entire READDIR operation(!)
1927                  */
1928                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1929                         goto fail;
1930                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1931                 if (p == NULL) {
1932                         nfserr = nfserr_toosmall;
1933                         goto fail;
1934                 }
1935         }
1936         cd->buflen -= (p - cd->buffer);
1937         cd->buffer = p;
1938         cd->common.err = nfs_ok;
1939         return 0;
1940 fail:
1941         cd->common.err = nfserr;
1942         return -EINVAL;
1943 }
1944
1945 static void
1946 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1947 {
1948         ENCODE_HEAD;
1949
1950         if (!nfserr) {
1951                 RESERVE_SPACE(8);
1952                 WRITE32(access->ac_supported);
1953                 WRITE32(access->ac_resp_access);
1954                 ADJUST_ARGS();
1955         }
1956 }
1957
1958 static void
1959 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1960 {
1961         ENCODE_SEQID_OP_HEAD;
1962
1963         if (!nfserr) {
1964                 RESERVE_SPACE(sizeof(stateid_t));
1965                 WRITE32(close->cl_stateid.si_generation);
1966                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1967                 ADJUST_ARGS();
1968         }
1969         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1970 }
1971
1972
1973 static void
1974 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
1975 {
1976         ENCODE_HEAD;
1977
1978         if (!nfserr) {
1979                 RESERVE_SPACE(8);
1980                 WRITEMEM(commit->co_verf.data, 8);
1981                 ADJUST_ARGS();
1982         }
1983 }
1984
1985 static void
1986 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
1987 {
1988         ENCODE_HEAD;
1989
1990         if (!nfserr) {
1991                 RESERVE_SPACE(32);
1992                 WRITECINFO(create->cr_cinfo);
1993                 WRITE32(2);
1994                 WRITE32(create->cr_bmval[0]);
1995                 WRITE32(create->cr_bmval[1]);
1996                 ADJUST_ARGS();
1997         }
1998 }
1999
2000 static __be32
2001 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2002 {
2003         struct svc_fh *fhp = getattr->ga_fhp;
2004         int buflen;
2005
2006         if (nfserr)
2007                 return nfserr;
2008
2009         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2010         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2011                                     resp->p, &buflen, getattr->ga_bmval,
2012                                     resp->rqstp);
2013         if (!nfserr)
2014                 resp->p += buflen;
2015         return nfserr;
2016 }
2017
2018 static void
2019 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh *fhp)
2020 {
2021         unsigned int len;
2022         ENCODE_HEAD;
2023
2024         if (!nfserr) {
2025                 len = fhp->fh_handle.fh_size;
2026                 RESERVE_SPACE(len + 4);
2027                 WRITE32(len);
2028                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2029                 ADJUST_ARGS();
2030         }
2031 }
2032
2033 /*
2034 * Including all fields other than the name, a LOCK4denied structure requires
2035 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2036 */
2037 static void
2038 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2039 {
2040         ENCODE_HEAD;
2041
2042         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2043         WRITE64(ld->ld_start);
2044         WRITE64(ld->ld_length);
2045         WRITE32(ld->ld_type);
2046         if (ld->ld_sop) {
2047                 WRITEMEM(&ld->ld_clientid, 8);
2048                 WRITE32(ld->ld_sop->so_owner.len);
2049                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2050                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2051         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2052                 WRITE64((u64)0); /* clientid */
2053                 WRITE32(0); /* length of owner name */
2054         }
2055         ADJUST_ARGS();
2056 }
2057
2058 static void
2059 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2060 {
2061         ENCODE_SEQID_OP_HEAD;
2062
2063         if (!nfserr) {
2064                 RESERVE_SPACE(4 + sizeof(stateid_t));
2065                 WRITE32(lock->lk_resp_stateid.si_generation);
2066                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2067                 ADJUST_ARGS();
2068         } else if (nfserr == nfserr_denied)
2069                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2070
2071         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2072 }
2073
2074 static void
2075 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2076 {
2077         if (nfserr == nfserr_denied)
2078                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2079 }
2080
2081 static void
2082 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2083 {
2084         ENCODE_SEQID_OP_HEAD;
2085
2086         if (!nfserr) {
2087                 RESERVE_SPACE(sizeof(stateid_t));
2088                 WRITE32(locku->lu_stateid.si_generation);
2089                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2090                 ADJUST_ARGS();
2091         }
2092
2093         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2094 }
2095
2096
2097 static void
2098 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2099 {
2100         ENCODE_HEAD;
2101
2102         if (!nfserr) {
2103                 RESERVE_SPACE(20);
2104                 WRITECINFO(link->li_cinfo);
2105                 ADJUST_ARGS();
2106         }
2107 }
2108
2109
2110 static void
2111 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2112 {
2113         ENCODE_SEQID_OP_HEAD;
2114
2115         if (nfserr)
2116                 goto out;
2117
2118         RESERVE_SPACE(36 + sizeof(stateid_t));
2119         WRITE32(open->op_stateid.si_generation);
2120         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2121         WRITECINFO(open->op_cinfo);
2122         WRITE32(open->op_rflags);
2123         WRITE32(2);
2124         WRITE32(open->op_bmval[0]);
2125         WRITE32(open->op_bmval[1]);
2126         WRITE32(open->op_delegate_type);
2127         ADJUST_ARGS();
2128
2129         switch (open->op_delegate_type) {
2130         case NFS4_OPEN_DELEGATE_NONE:
2131                 break;
2132         case NFS4_OPEN_DELEGATE_READ:
2133                 RESERVE_SPACE(20 + sizeof(stateid_t));
2134                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2135                 WRITE32(open->op_recall);
2136
2137                 /*
2138                  * TODO: ACE's in delegations
2139                  */
2140                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2141                 WRITE32(0);
2142                 WRITE32(0);
2143                 WRITE32(0);   /* XXX: is NULL principal ok? */
2144                 ADJUST_ARGS();
2145                 break;
2146         case NFS4_OPEN_DELEGATE_WRITE:
2147                 RESERVE_SPACE(32 + sizeof(stateid_t));
2148                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2149                 WRITE32(0);
2150
2151                 /*
2152                  * TODO: space_limit's in delegations
2153                  */
2154                 WRITE32(NFS4_LIMIT_SIZE);
2155                 WRITE32(~(u32)0);
2156                 WRITE32(~(u32)0);
2157
2158                 /*
2159                  * TODO: ACE's in delegations
2160                  */
2161                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2162                 WRITE32(0);
2163                 WRITE32(0);
2164                 WRITE32(0);   /* XXX: is NULL principal ok? */
2165                 ADJUST_ARGS();
2166                 break;
2167         default:
2168                 BUG();
2169         }
2170         /* XXX save filehandle here */
2171 out:
2172         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2173 }
2174
2175 static void
2176 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2177 {
2178         ENCODE_SEQID_OP_HEAD;
2179
2180         if (!nfserr) {
2181                 RESERVE_SPACE(sizeof(stateid_t));
2182                 WRITE32(oc->oc_resp_stateid.si_generation);
2183                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2184                 ADJUST_ARGS();
2185         }
2186
2187         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2188 }
2189
2190 static void
2191 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2192 {
2193         ENCODE_SEQID_OP_HEAD;
2194
2195         if (!nfserr) {
2196                 RESERVE_SPACE(sizeof(stateid_t));
2197                 WRITE32(od->od_stateid.si_generation);
2198                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2199                 ADJUST_ARGS();
2200         }
2201
2202         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2203 }
2204
2205 static __be32
2206 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2207                   struct nfsd4_read *read)
2208 {
2209         u32 eof;
2210         int v, pn;
2211         unsigned long maxcount;
2212         long len;
2213         ENCODE_HEAD;
2214
2215         if (nfserr)
2216                 return nfserr;
2217         if (resp->xbuf->page_len)
2218                 return nfserr_resource;
2219
2220         RESERVE_SPACE(8); /* eof flag and byte count */
2221
2222         maxcount = svc_max_payload(resp->rqstp);
2223         if (maxcount > read->rd_length)
2224                 maxcount = read->rd_length;
2225
2226         len = maxcount;
2227         v = 0;
2228         while (len > 0) {
2229                 pn = resp->rqstp->rq_resused++;
2230                 resp->rqstp->rq_vec[v].iov_base =
2231                         page_address(resp->rqstp->rq_respages[pn]);
2232                 resp->rqstp->rq_vec[v].iov_len =
2233                         len < PAGE_SIZE ? len : PAGE_SIZE;
2234                 v++;
2235                 len -= PAGE_SIZE;
2236         }
2237         read->rd_vlen = v;
2238
2239         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2240                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2241                         &maxcount);
2242
2243         if (nfserr == nfserr_symlink)
2244                 nfserr = nfserr_inval;
2245         if (nfserr)
2246                 return nfserr;
2247         eof = (read->rd_offset + maxcount >=
2248                read->rd_fhp->fh_dentry->d_inode->i_size);
2249
2250         WRITE32(eof);
2251         WRITE32(maxcount);
2252         ADJUST_ARGS();
2253         resp->xbuf->head[0].iov_len = (char*)p
2254                                         - (char*)resp->xbuf->head[0].iov_base;
2255         resp->xbuf->page_len = maxcount;
2256
2257         /* Use rest of head for padding and remaining ops: */
2258         resp->xbuf->tail[0].iov_base = p;
2259         resp->xbuf->tail[0].iov_len = 0;
2260         if (maxcount&3) {
2261                 RESERVE_SPACE(4);
2262                 WRITE32(0);
2263                 resp->xbuf->tail[0].iov_base += maxcount&3;
2264                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2265                 ADJUST_ARGS();
2266         }
2267         return 0;
2268 }
2269
2270 static __be32
2271 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2272 {
2273         int maxcount;
2274         char *page;
2275         ENCODE_HEAD;
2276
2277         if (nfserr)
2278                 return nfserr;
2279         if (resp->xbuf->page_len)
2280                 return nfserr_resource;
2281
2282         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2283
2284         maxcount = PAGE_SIZE;
2285         RESERVE_SPACE(4);
2286
2287         /*
2288          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2289          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2290          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2291          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2292          */
2293         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2294         if (nfserr == nfserr_isdir)
2295                 return nfserr_inval;
2296         if (nfserr)
2297                 return nfserr;
2298
2299         WRITE32(maxcount);
2300         ADJUST_ARGS();
2301         resp->xbuf->head[0].iov_len = (char*)p
2302                                 - (char*)resp->xbuf->head[0].iov_base;
2303         resp->xbuf->page_len = maxcount;
2304
2305         /* Use rest of head for padding and remaining ops: */
2306         resp->xbuf->tail[0].iov_base = p;
2307         resp->xbuf->tail[0].iov_len = 0;
2308         if (maxcount&3) {
2309                 RESERVE_SPACE(4);
2310                 WRITE32(0);
2311                 resp->xbuf->tail[0].iov_base += maxcount&3;
2312                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2313                 ADJUST_ARGS();
2314         }
2315         return 0;
2316 }
2317
2318 static __be32
2319 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2320 {
2321         int maxcount;
2322         loff_t offset;
2323         __be32 *page, *savep, *tailbase;
2324         ENCODE_HEAD;
2325
2326         if (nfserr)
2327                 return nfserr;
2328         if (resp->xbuf->page_len)
2329                 return nfserr_resource;
2330
2331         RESERVE_SPACE(8);  /* verifier */
2332         savep = p;
2333
2334         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2335         WRITE32(0);
2336         WRITE32(0);
2337         ADJUST_ARGS();
2338         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2339         tailbase = p;
2340
2341         maxcount = PAGE_SIZE;
2342         if (maxcount > readdir->rd_maxcount)
2343                 maxcount = readdir->rd_maxcount;
2344
2345         /*
2346          * Convert from bytes to words, account for the two words already
2347          * written, make sure to leave two words at the end for the next
2348          * pointer and eof field.
2349          */
2350         maxcount = (maxcount >> 2) - 4;
2351         if (maxcount < 0) {
2352                 nfserr =  nfserr_toosmall;
2353                 goto err_no_verf;
2354         }
2355
2356         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2357         readdir->common.err = 0;
2358         readdir->buflen = maxcount;
2359         readdir->buffer = page;
2360         readdir->offset = NULL;
2361
2362         offset = readdir->rd_cookie;
2363         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2364                               &offset,
2365                               &readdir->common, nfsd4_encode_dirent);
2366         if (nfserr == nfs_ok &&
2367             readdir->common.err == nfserr_toosmall &&
2368             readdir->buffer == page)
2369                 nfserr = nfserr_toosmall;
2370         if (nfserr == nfserr_symlink)
2371                 nfserr = nfserr_notdir;
2372         if (nfserr)
2373                 goto err_no_verf;
2374
2375         if (readdir->offset)
2376                 xdr_encode_hyper(readdir->offset, offset);
2377
2378         p = readdir->buffer;
2379         *p++ = 0;       /* no more entries */
2380         *p++ = htonl(readdir->common.err == nfserr_eof);
2381         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2382                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2383
2384         /* Use rest of head for padding and remaining ops: */
2385         resp->xbuf->tail[0].iov_base = tailbase;
2386         resp->xbuf->tail[0].iov_len = 0;
2387         resp->p = resp->xbuf->tail[0].iov_base;
2388         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2389
2390         return 0;
2391 err_no_verf:
2392         p = savep;
2393         ADJUST_ARGS();
2394         return nfserr;
2395 }
2396
2397 static void
2398 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2399 {
2400         ENCODE_HEAD;
2401
2402         if (!nfserr) {
2403                 RESERVE_SPACE(20);
2404                 WRITECINFO(remove->rm_cinfo);
2405                 ADJUST_ARGS();
2406         }
2407 }
2408
2409 static void
2410 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2411 {
2412         ENCODE_HEAD;
2413
2414         if (!nfserr) {
2415                 RESERVE_SPACE(40);
2416                 WRITECINFO(rename->rn_sinfo);
2417                 WRITECINFO(rename->rn_tinfo);
2418                 ADJUST_ARGS();
2419         }
2420 }
2421
2422 /*
2423  * The SETATTR encode routine is special -- it always encodes a bitmap,
2424  * regardless of the error status.
2425  */
2426 static void
2427 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2428 {
2429         ENCODE_HEAD;
2430
2431         RESERVE_SPACE(12);
2432         if (nfserr) {
2433                 WRITE32(2);
2434                 WRITE32(0);
2435                 WRITE32(0);
2436         }
2437         else {
2438                 WRITE32(2);
2439                 WRITE32(setattr->sa_bmval[0]);
2440                 WRITE32(setattr->sa_bmval[1]);
2441         }
2442         ADJUST_ARGS();
2443 }
2444
2445 static void
2446 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2447 {
2448         ENCODE_HEAD;
2449
2450         if (!nfserr) {
2451                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2452                 WRITEMEM(&scd->se_clientid, 8);
2453                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2454                 ADJUST_ARGS();
2455         }
2456         else if (nfserr == nfserr_clid_inuse) {
2457                 RESERVE_SPACE(8);
2458                 WRITE32(0);
2459                 WRITE32(0);
2460                 ADJUST_ARGS();
2461         }
2462 }
2463
2464 static void
2465 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2466 {
2467         ENCODE_HEAD;
2468
2469         if (!nfserr) {
2470                 RESERVE_SPACE(16);
2471                 WRITE32(write->wr_bytes_written);
2472                 WRITE32(write->wr_how_written);
2473                 WRITEMEM(write->wr_verifier.data, 8);
2474                 ADJUST_ARGS();
2475         }
2476 }
2477
2478 void
2479 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2480 {
2481         __be32 *statp;
2482         ENCODE_HEAD;
2483
2484         RESERVE_SPACE(8);
2485         WRITE32(op->opnum);
2486         statp = p++;    /* to be backfilled at the end */
2487         ADJUST_ARGS();
2488
2489         switch (op->opnum) {
2490         case OP_ACCESS:
2491                 nfsd4_encode_access(resp, op->status, &op->u.access);
2492                 break;
2493         case OP_CLOSE:
2494                 nfsd4_encode_close(resp, op->status, &op->u.close);
2495                 break;
2496         case OP_COMMIT:
2497                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2498                 break;
2499         case OP_CREATE:
2500                 nfsd4_encode_create(resp, op->status, &op->u.create);
2501                 break;
2502         case OP_DELEGRETURN:
2503                 break;
2504         case OP_GETATTR:
2505                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2506                 break;
2507         case OP_GETFH:
2508                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2509                 break;
2510         case OP_LINK:
2511                 nfsd4_encode_link(resp, op->status, &op->u.link);
2512                 break;
2513         case OP_LOCK:
2514                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2515                 break;
2516         case OP_LOCKT:
2517                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2518                 break;
2519         case OP_LOCKU:
2520                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2521                 break;
2522         case OP_LOOKUP:
2523                 break;
2524         case OP_LOOKUPP:
2525                 break;
2526         case OP_NVERIFY:
2527                 break;
2528         case OP_OPEN:
2529                 nfsd4_encode_open(resp, op->status, &op->u.open);
2530                 break;
2531         case OP_OPEN_CONFIRM:
2532                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2533                 break;
2534         case OP_OPEN_DOWNGRADE:
2535                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2536                 break;
2537         case OP_PUTFH:
2538                 break;
2539         case OP_PUTROOTFH:
2540                 break;
2541         case OP_READ:
2542                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2543                 break;
2544         case OP_READDIR:
2545                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2546                 break;
2547         case OP_READLINK:
2548                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2549                 break;
2550         case OP_REMOVE:
2551                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2552                 break;
2553         case OP_RENAME:
2554                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2555                 break;
2556         case OP_RENEW:
2557                 break;
2558         case OP_RESTOREFH:
2559                 break;
2560         case OP_SAVEFH:
2561                 break;
2562         case OP_SETATTR:
2563                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2564                 break;
2565         case OP_SETCLIENTID:
2566                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2567                 break;
2568         case OP_SETCLIENTID_CONFIRM:
2569                 break;
2570         case OP_VERIFY:
2571                 break;
2572         case OP_WRITE:
2573                 nfsd4_encode_write(resp, op->status, &op->u.write);
2574                 break;
2575         case OP_RELEASE_LOCKOWNER:
2576                 break;
2577         default:
2578                 break;
2579         }
2580
2581         /*
2582          * Note: We write the status directly, instead of using WRITE32(),
2583          * since it is already in network byte order.
2584          */
2585         *statp = op->status;
2586 }
2587
2588 /*
2589  * Encode the reply stored in the stateowner reply cache
2590  *
2591  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2592  * previously sent already encoded operation.
2593  *
2594  * called with nfs4_lock_state() held
2595  */
2596 void
2597 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2598 {
2599         ENCODE_HEAD;
2600         struct nfs4_replay *rp = op->replay;
2601
2602         BUG_ON(!rp);
2603
2604         RESERVE_SPACE(8);
2605         WRITE32(op->opnum);
2606         *p++ = rp->rp_status;  /* already xdr'ed */
2607         ADJUST_ARGS();
2608
2609         RESERVE_SPACE(rp->rp_buflen);
2610         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2611         ADJUST_ARGS();
2612 }
2613
2614 /*
2615  * END OF "GENERIC" ENCODE ROUTINES.
2616  */
2617
2618 int
2619 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2620 {
2621         return xdr_ressize_check(rqstp, p);
2622 }
2623
2624 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2625 {
2626         if (args->ops != args->iops) {
2627                 kfree(args->ops);
2628                 args->ops = args->iops;
2629         }
2630         kfree(args->tmpp);
2631         args->tmpp = NULL;
2632         while (args->to_free) {
2633                 struct tmpbuf *tb = args->to_free;
2634                 args->to_free = tb->next;
2635                 tb->release(tb->buf);
2636                 kfree(tb);
2637         }
2638 }
2639
2640 int
2641 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2642 {
2643         __be32 status;
2644
2645         args->p = p;
2646         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2647         args->pagelist = rqstp->rq_arg.pages;
2648         args->pagelen = rqstp->rq_arg.page_len;
2649         args->tmpp = NULL;
2650         args->to_free = NULL;
2651         args->ops = args->iops;
2652         args->rqstp = rqstp;
2653
2654         status = nfsd4_decode_compound(args);
2655         if (status) {
2656                 nfsd4_release_compoundargs(args);
2657         }
2658         return !status;
2659 }
2660
2661 int
2662 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2663 {
2664         /*
2665          * All that remains is to write the tag and operation count...
2666          */
2667         struct kvec *iov;
2668         p = resp->tagp;
2669         *p++ = htonl(resp->taglen);
2670         memcpy(p, resp->tag, resp->taglen);
2671         p += XDR_QUADLEN(resp->taglen);
2672         *p++ = htonl(resp->opcnt);
2673
2674         if (rqstp->rq_res.page_len)
2675                 iov = &rqstp->rq_res.tail[0];
2676         else
2677                 iov = &rqstp->rq_res.head[0];
2678         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2679         BUG_ON(iov->iov_len > PAGE_SIZE);
2680         return 1;
2681 }
2682
2683 /*
2684  * Local variables:
2685  *  c-basic-offset: 8
2686  * End:
2687  */