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