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

   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_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 417 {
 418         DECODE_HEAD;
 419
 420         READ_BUF(4);
 421         READ32(access->ac_req_access);
 422
 423         DECODE_TAIL;
 424 }
 425
 426 static __be32
 427 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 428 {
 429         DECODE_HEAD;
 430
 431         close->cl_stateowner = NULL;
 432         READ_BUF(4 + sizeof(stateid_t));
 433         READ32(close->cl_seqid);
 434         READ32(close->cl_stateid.si_generation);
 435         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
 436
 437         DECODE_TAIL;
 438 }
 439
 440
 441 static __be32
 442 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 443 {
 444         DECODE_HEAD;
 445
 446         READ_BUF(12);
 447         READ64(commit->co_offset);
 448         READ32(commit->co_count);
 449
 450         DECODE_TAIL;
 451 }
 452
 453 static __be32
 454 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 455 {
 456         DECODE_HEAD;
 457
 458         READ_BUF(4);
 459         READ32(create->cr_type);
 460         switch (create->cr_type) {
 461         case NF4LNK:
 462                 READ_BUF(4);
 463                 READ32(create->cr_linklen);
 464                 READ_BUF(create->cr_linklen);
 465                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 466                 break;
 467         case NF4BLK:
 468         case NF4CHR:
 469                 READ_BUF(8);
 470                 READ32(create->cr_specdata1);
 471                 READ32(create->cr_specdata2);
 472                 break;
 473         case NF4SOCK:
 474         case NF4FIFO:
 475         case NF4DIR:
 476         default:
 477                 break;
 478         }
 479
 480         READ_BUF(4);
 481         READ32(create->cr_namelen);
 482         READ_BUF(create->cr_namelen);
 483         SAVEMEM(create->cr_name, create->cr_namelen);
 484         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 485                 return status;
 486
 487         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 488                 goto out;
 489
 490         DECODE_TAIL;
 491 }
 492
 493 static inline __be32
 494 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 495 {
 496         DECODE_HEAD;
 497
 498         READ_BUF(sizeof(stateid_t));
 499         READ32(dr->dr_stateid.si_generation);
 500         COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
 501
 502         DECODE_TAIL;
 503 }
 504
 505 static inline __be32
 506 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 507 {
 508         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 509 }
 510
 511 static __be32
 512 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 513 {
 514         DECODE_HEAD;
 515
 516         READ_BUF(4);
 517         READ32(link->li_namelen);
 518         READ_BUF(link->li_namelen);
 519         SAVEMEM(link->li_name, link->li_namelen);
 520         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 521                 return status;
 522
 523         DECODE_TAIL;
 524 }
 525
 526 static __be32
 527 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 528 {
 529         DECODE_HEAD;
 530
 531         lock->lk_replay_owner = NULL;
 532         /*
 533         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 534         */
 535         READ_BUF(28);
 536         READ32(lock->lk_type);
 537         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 538                 goto xdr_error;
 539         READ32(lock->lk_reclaim);
 540         READ64(lock->lk_offset);
 541         READ64(lock->lk_length);
 542         READ32(lock->lk_is_new);
 543
 544         if (lock->lk_is_new) {
 545                 READ_BUF(36);
 546                 READ32(lock->lk_new_open_seqid);
 547                 READ32(lock->lk_new_open_stateid.si_generation);
 548
 549                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
 550                 READ32(lock->lk_new_lock_seqid);
 551                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 552                 READ32(lock->lk_new_owner.len);
 553                 READ_BUF(lock->lk_new_owner.len);
 554                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 555         } else {
 556                 READ_BUF(20);
 557                 READ32(lock->lk_old_lock_stateid.si_generation);
 558                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
 559                 READ32(lock->lk_old_lock_seqid);
 560         }
 561
 562         DECODE_TAIL;
 563 }
 564
 565 static __be32
 566 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 567 {
 568         DECODE_HEAD;
 569
 570         READ_BUF(32);
 571         READ32(lockt->lt_type);
 572         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 573                 goto xdr_error;
 574         READ64(lockt->lt_offset);
 575         READ64(lockt->lt_length);
 576         COPYMEM(&lockt->lt_clientid, 8);
 577         READ32(lockt->lt_owner.len);
 578         READ_BUF(lockt->lt_owner.len);
 579         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 580
 581         DECODE_TAIL;
 582 }
 583
 584 static __be32
 585 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 586 {
 587         DECODE_HEAD;
 588
 589         locku->lu_stateowner = NULL;
 590         READ_BUF(24 + sizeof(stateid_t));
 591         READ32(locku->lu_type);
 592         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 593                 goto xdr_error;
 594         READ32(locku->lu_seqid);
 595         READ32(locku->lu_stateid.si_generation);
 596         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
 597         READ64(locku->lu_offset);
 598         READ64(locku->lu_length);
 599
 600         DECODE_TAIL;
 601 }
 602
 603 static __be32
 604 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 605 {
 606         DECODE_HEAD;
 607
 608         READ_BUF(4);
 609         READ32(lookup->lo_len);
 610         READ_BUF(lookup->lo_len);
 611         SAVEMEM(lookup->lo_name, lookup->lo_len);
 612         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 613                 return status;
 614
 615         DECODE_TAIL;
 616 }
 617
 618 static __be32
 619 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 620 {
 621         DECODE_HEAD;
 622
 623         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 624         open->op_iattr.ia_valid = 0;
 625         open->op_stateowner = NULL;
 626
 627         /* seqid, share_access, share_deny, clientid, ownerlen */
 628         READ_BUF(16 + sizeof(clientid_t));
 629         READ32(open->op_seqid);
 630         READ32(open->op_share_access);
 631         READ32(open->op_share_deny);
 632         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 633         READ32(open->op_owner.len);
 634
 635         /* owner, open_flag */
 636         READ_BUF(open->op_owner.len + 4);
 637         SAVEMEM(open->op_owner.data, open->op_owner.len);
 638         READ32(open->op_create);
 639         switch (open->op_create) {
 640         case NFS4_OPEN_NOCREATE:
 641                 break;
 642         case NFS4_OPEN_CREATE:
 643                 READ_BUF(4);
 644                 READ32(open->op_createmode);
 645                 switch (open->op_createmode) {
 646                 case NFS4_CREATE_UNCHECKED:
 647                 case NFS4_CREATE_GUARDED:
 648                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 649                                 goto out;
 650                         break;
 651                 case NFS4_CREATE_EXCLUSIVE:
 652                         READ_BUF(8);
 653                         COPYMEM(open->op_verf.data, 8);
 654                         break;
 655                 default:
 656                         goto xdr_error;
 657                 }
 658                 break;
 659         default:
 660                 goto xdr_error;
 661         }
 662
 663         /* open_claim */
 664         READ_BUF(4);
 665         READ32(open->op_claim_type);
 666         switch (open->op_claim_type) {
 667         case NFS4_OPEN_CLAIM_NULL:
 668         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 669                 READ_BUF(4);
 670                 READ32(open->op_fname.len);
 671                 READ_BUF(open->op_fname.len);
 672                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 673                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 674                         return status;
 675                 break;
 676         case NFS4_OPEN_CLAIM_PREVIOUS:
 677                 READ_BUF(4);
 678                 READ32(open->op_delegate_type);
 679                 break;
 680         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 681                 READ_BUF(sizeof(stateid_t) + 4);
 682                 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
 683                 READ32(open->op_fname.len);
 684                 READ_BUF(open->op_fname.len);
 685                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 686                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 687                         return status;
 688                 break;
 689         default:
 690                 goto xdr_error;
 691         }
 692
 693         DECODE_TAIL;
 694 }
 695
 696 static __be32
 697 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 698 {
 699         DECODE_HEAD;
 700
 701         open_conf->oc_stateowner = NULL;
 702         READ_BUF(4 + sizeof(stateid_t));
 703         READ32(open_conf->oc_req_stateid.si_generation);
 704         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
 705         READ32(open_conf->oc_seqid);
 706
 707         DECODE_TAIL;
 708 }
 709
 710 static __be32
 711 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 712 {
 713         DECODE_HEAD;
 714
 715         open_down->od_stateowner = NULL;
 716         READ_BUF(12 + sizeof(stateid_t));
 717         READ32(open_down->od_stateid.si_generation);
 718         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
 719         READ32(open_down->od_seqid);
 720         READ32(open_down->od_share_access);
 721         READ32(open_down->od_share_deny);
 722
 723         DECODE_TAIL;
 724 }
 725
 726 static __be32
 727 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 728 {
 729         DECODE_HEAD;
 730
 731         READ_BUF(4);
 732         READ32(putfh->pf_fhlen);
 733         if (putfh->pf_fhlen > NFS4_FHSIZE)
 734                 goto xdr_error;
 735         READ_BUF(putfh->pf_fhlen);
 736         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 737
 738         DECODE_TAIL;
 739 }
 740
 741 static __be32
 742 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 743 {
 744         DECODE_HEAD;
 745
 746         READ_BUF(sizeof(stateid_t) + 12);
 747         READ32(read->rd_stateid.si_generation);
 748         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
 749         READ64(read->rd_offset);
 750         READ32(read->rd_length);
 751
 752         DECODE_TAIL;
 753 }
 754
 755 static __be32
 756 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 757 {
 758         DECODE_HEAD;
 759
 760         READ_BUF(24);
 761         READ64(readdir->rd_cookie);
 762         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 763         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 764         READ32(readdir->rd_maxcount);
 765         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 766                 goto out;
 767
 768         DECODE_TAIL;
 769 }
 770
 771 static __be32
 772 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 773 {
 774         DECODE_HEAD;
 775
 776         READ_BUF(4);
 777         READ32(remove->rm_namelen);
 778         READ_BUF(remove->rm_namelen);
 779         SAVEMEM(remove->rm_name, remove->rm_namelen);
 780         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 781                 return status;
 782
 783         DECODE_TAIL;
 784 }
 785
 786 static __be32
 787 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 788 {
 789         DECODE_HEAD;
 790
 791         READ_BUF(4);
 792         READ32(rename->rn_snamelen);
 793         READ_BUF(rename->rn_snamelen + 4);
 794         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 795         READ32(rename->rn_tnamelen);
 796         READ_BUF(rename->rn_tnamelen);
 797         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 798         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 799                 return status;
 800         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 801                 return status;
 802
 803         DECODE_TAIL;
 804 }
 805
 806 static __be32
 807 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 808 {
 809         DECODE_HEAD;
 810
 811         READ_BUF(sizeof(clientid_t));
 812         COPYMEM(clientid, sizeof(clientid_t));
 813
 814         DECODE_TAIL;
 815 }
 816
 817 static __be32
 818 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 819                      struct nfsd4_secinfo *secinfo)
 820 {
 821         DECODE_HEAD;
 822
 823         READ_BUF(4);
 824         READ32(secinfo->si_namelen);
 825         READ_BUF(secinfo->si_namelen);
 826         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 827         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 828                                                                 nfserr_noent);
 829         if (status)
 830                 return status;
 831         DECODE_TAIL;
 832 }
 833
 834 static __be32
 835 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 836 {
 837         DECODE_HEAD;
 838
 839         READ_BUF(sizeof(stateid_t));
 840         READ32(setattr->sa_stateid.si_generation);
 841         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 842         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 843                 goto out;
 844
 845         DECODE_TAIL;
 846 }
 847
 848 static __be32
 849 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 850 {
 851         DECODE_HEAD;
 852
 853         READ_BUF(12);
 854         COPYMEM(setclientid->se_verf.data, 8);
 855         READ32(setclientid->se_namelen);
 856
 857         READ_BUF(setclientid->se_namelen + 8);
 858         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 859         READ32(setclientid->se_callback_prog);
 860         READ32(setclientid->se_callback_netid_len);
 861
 862         READ_BUF(setclientid->se_callback_netid_len + 4);
 863         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 864         READ32(setclientid->se_callback_addr_len);
 865
 866         READ_BUF(setclientid->se_callback_addr_len + 4);
 867         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 868         READ32(setclientid->se_callback_ident);
 869
 870         DECODE_TAIL;
 871 }
 872
 873 static __be32
 874 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 875 {
 876         DECODE_HEAD;
 877
 878         READ_BUF(8 + sizeof(nfs4_verifier));
 879         COPYMEM(&scd_c->sc_clientid, 8);
 880         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 881
 882         DECODE_TAIL;
 883 }
 884
 885 /* Also used for NVERIFY */
 886 static __be32
 887 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 888 {
 889 #if 0
 890         struct nfsd4_compoundargs save = {
 891                 .p = argp->p,
 892                 .end = argp->end,
 893                 .rqstp = argp->rqstp,
 894         };
 895         u32             ve_bmval[2];
 896         struct iattr    ve_iattr;           /* request */
 897         struct nfs4_acl *ve_acl;            /* request */
 898 #endif
 899         DECODE_HEAD;
 900
 901         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 902                 goto out;
 903
 904         /* For convenience's sake, we compare raw xdr'd attributes in
 905          * nfsd4_proc_verify; however we still decode here just to return
 906          * correct error in case of bad xdr. */
 907 #if 0
 908         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 909         if (status == nfserr_inval) {
 910                 status = nfserrno(status);
 911                 goto out;
 912         }
 913 #endif
 914         READ_BUF(4);
 915         READ32(verify->ve_attrlen);
 916         READ_BUF(verify->ve_attrlen);
 917         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 918
 919         DECODE_TAIL;
 920 }
 921
 922 static __be32
 923 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 924 {
 925         int avail;
 926         int v;
 927         int len;
 928         DECODE_HEAD;
 929
 930         READ_BUF(sizeof(stateid_opaque_t) + 20);
 931         READ32(write->wr_stateid.si_generation);
 932         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
 933         READ64(write->wr_offset);
 934         READ32(write->wr_stable_how);
 935         if (write->wr_stable_how > 2)
 936                 goto xdr_error;
 937         READ32(write->wr_buflen);
 938
 939         /* Sorry .. no magic macros for this.. *
 940          * READ_BUF(write->wr_buflen);
 941          * SAVEMEM(write->wr_buf, write->wr_buflen);
 942          */
 943         avail = (char*)argp->end - (char*)argp->p;
 944         if (avail + argp->pagelen < write->wr_buflen) {
 945                 dprintk("NFSD: xdr error (%s:%d)\n",
 946                                 __FILE__, __LINE__);
 947                 goto xdr_error;
 948         }
 949         argp->rqstp->rq_vec[0].iov_base = p;
 950         argp->rqstp->rq_vec[0].iov_len = avail;
 951         v = 0;
 952         len = write->wr_buflen;
 953         while (len > argp->rqstp->rq_vec[v].iov_len) {
 954                 len -= argp->rqstp->rq_vec[v].iov_len;
 955                 v++;
 956                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 957                 argp->pagelist++;
 958                 if (argp->pagelen >= PAGE_SIZE) {
 959                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 960                         argp->pagelen -= PAGE_SIZE;
 961                 } else {
 962                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 963                         argp->pagelen -= len;
 964                 }
 965         }
 966         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 967         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 968         argp->rqstp->rq_vec[v].iov_len = len;
 969         write->wr_vlen = v+1;
 970
 971         DECODE_TAIL;
 972 }
 973
 974 static __be32
 975 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 976 {
 977         DECODE_HEAD;
 978
 979         READ_BUF(12);
 980         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 981         READ32(rlockowner->rl_owner.len);
 982         READ_BUF(rlockowner->rl_owner.len);
 983         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 984
 985         DECODE_TAIL;
 986 }
 987
 988 static __be32
 989 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
 990 {
 991         return nfs_ok;
 992 }
 993
 994 static __be32
 995 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
 996 {
 997         return nfserr_opnotsupp;
 998 }
 999
1000 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1001
1002 static nfsd4_dec nfsd4_dec_ops[] = {
1003         [OP_ACCESS]             (nfsd4_dec)nfsd4_decode_access,
1004         [OP_CLOSE]              (nfsd4_dec)nfsd4_decode_close,
1005         [OP_COMMIT]             (nfsd4_dec)nfsd4_decode_commit,
1006         [OP_CREATE]             (nfsd4_dec)nfsd4_decode_create,
1007         [OP_DELEGPURGE]         (nfsd4_dec)nfsd4_decode_notsupp,
1008         [OP_DELEGRETURN]        (nfsd4_dec)nfsd4_decode_delegreturn,
1009         [OP_GETATTR]            (nfsd4_dec)nfsd4_decode_getattr,
1010         [OP_GETFH]              (nfsd4_dec)nfsd4_decode_noop,
1011         [OP_LINK]               (nfsd4_dec)nfsd4_decode_link,
1012         [OP_LOCK]               (nfsd4_dec)nfsd4_decode_lock,
1013         [OP_LOCKT]              (nfsd4_dec)nfsd4_decode_lockt,
1014         [OP_LOCKU]              (nfsd4_dec)nfsd4_decode_locku,
1015         [OP_LOOKUP]             (nfsd4_dec)nfsd4_decode_lookup,
1016         [OP_LOOKUPP]            (nfsd4_dec)nfsd4_decode_noop,
1017         [OP_NVERIFY]            (nfsd4_dec)nfsd4_decode_verify,
1018         [OP_OPEN]               (nfsd4_dec)nfsd4_decode_open,
1019         [OP_OPENATTR]           (nfsd4_dec)nfsd4_decode_notsupp,
1020         [OP_OPEN_CONFIRM]       (nfsd4_dec)nfsd4_decode_open_confirm,
1021         [OP_OPEN_DOWNGRADE]     (nfsd4_dec)nfsd4_decode_open_downgrade,
1022         [OP_PUTFH]              (nfsd4_dec)nfsd4_decode_putfh,
1023         [OP_PUTPUBFH]           (nfsd4_dec)nfsd4_decode_notsupp,
1024         [OP_PUTROOTFH]          (nfsd4_dec)nfsd4_decode_noop,
1025         [OP_READ]               (nfsd4_dec)nfsd4_decode_read,
1026         [OP_READDIR]            (nfsd4_dec)nfsd4_decode_readdir,
1027         [OP_READLINK]           (nfsd4_dec)nfsd4_decode_noop,
1028         [OP_REMOVE]             (nfsd4_dec)nfsd4_decode_remove,
1029         [OP_RENAME]             (nfsd4_dec)nfsd4_decode_rename,
1030         [OP_RENEW]              (nfsd4_dec)nfsd4_decode_renew,
1031         [OP_RESTOREFH]          (nfsd4_dec)nfsd4_decode_noop,
1032         [OP_SAVEFH]             (nfsd4_dec)nfsd4_decode_noop,
1033         [OP_SECINFO]            (nfsd4_dec)nfsd4_decode_secinfo,
1034         [OP_SETATTR]            (nfsd4_dec)nfsd4_decode_setattr,
1035         [OP_SETCLIENTID]        (nfsd4_dec)nfsd4_decode_setclientid,
1036         [OP_SETCLIENTID_CONFIRM](nfsd4_dec)nfsd4_decode_setclientid_confirm,
1037         [OP_VERIFY]             (nfsd4_dec)nfsd4_decode_verify,
1038         [OP_WRITE]              (nfsd4_dec)nfsd4_decode_write,
1039         [OP_RELEASE_LOCKOWNER]  (nfsd4_dec)nfsd4_decode_release_lockowner,
1040 };
1041
1042 static __be32
1043 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1044 {
1045         DECODE_HEAD;
1046         struct nfsd4_op *op;
1047         int i;
1048
1049         /*
1050          * XXX: According to spec, we should check the tag
1051          * for UTF-8 compliance.  I'm postponing this for
1052          * now because it seems that some clients do use
1053          * binary tags.
1054          */
1055         READ_BUF(4);
1056         READ32(argp->taglen);
1057         READ_BUF(argp->taglen + 8);
1058         SAVEMEM(argp->tag, argp->taglen);
1059         READ32(argp->minorversion);
1060         READ32(argp->opcnt);
1061
1062         if (argp->taglen > NFSD4_MAX_TAGLEN)
1063                 goto xdr_error;
1064         if (argp->opcnt > 100)
1065                 goto xdr_error;
1066
1067         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1068                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1069                 if (!argp->ops) {
1070                         argp->ops = argp->iops;
1071                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1072                         goto xdr_error;
1073                 }
1074         }
1075
1076         if (argp->minorversion != 0)
1077                 argp->opcnt = 0;
1078
1079         for (i = 0; i < argp->opcnt; i++) {
1080                 op = &argp->ops[i];
1081                 op->replay = NULL;
1082
1083                 /*
1084                  * We can't use READ_BUF() here because we need to handle
1085                  * a missing opcode as an OP_WRITE + 1. So we need to check
1086                  * to see if we're truly at the end of our buffer or if there
1087                  * is another page we need to flip to.
1088                  */
1089
1090                 if (argp->p == argp->end) {
1091                         if (argp->pagelen < 4) {
1092                                 /* There isn't an opcode still on the wire */
1093                                 op->opnum = OP_WRITE + 1;
1094                                 op->status = nfserr_bad_xdr;
1095                                 argp->opcnt = i+1;
1096                                 break;
1097                         }
1098
1099                         /*
1100                          * False alarm. We just hit a page boundary, but there
1101                          * is still data available.  Move pointer across page
1102                          * boundary.  *snip from READ_BUF*
1103                          */
1104                         argp->p = page_address(argp->pagelist[0]);
1105                         argp->pagelist++;
1106                         if (argp->pagelen < PAGE_SIZE) {
1107                                 argp->end = p + (argp->pagelen>>2);
1108                                 argp->pagelen = 0;
1109                         } else {
1110                                 argp->end = p + (PAGE_SIZE>>2);
1111                                 argp->pagelen -= PAGE_SIZE;
1112                         }
1113                 }
1114                 op->opnum = ntohl(*argp->p++);
1115
1116                 if (op->opnum >= OP_ACCESS && op->opnum < ARRAY_SIZE(nfsd4_dec_ops))
1117                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1118                 else {
1119                         op->opnum = OP_ILLEGAL;
1120                         op->status = nfserr_op_illegal;
1121                 }
1122
1123                 if (op->status) {
1124                         argp->opcnt = i+1;
1125                         break;
1126                 }
1127         }
1128
1129         DECODE_TAIL;
1130 }
1131 /*
1132  * END OF "GENERIC" DECODE ROUTINES.
1133  */
1134
1135 /*
1136  * START OF "GENERIC" ENCODE ROUTINES.
1137  *   These may look a little ugly since they are imported from a "generic"
1138  * set of XDR encode/decode routines which are intended to be shared by
1139  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1140  *
1141  * If the pain of reading these is too great, it should be a straightforward
1142  * task to translate them into Linux-specific versions which are more
1143  * consistent with the style used in NFSv2/v3...
1144  */
1145 #define ENCODE_HEAD              __be32 *p
1146
1147 #define WRITE32(n)               *p++ = htonl(n)
1148 #define WRITE64(n)               do {                           \
1149         *p++ = htonl((u32)((n) >> 32));                         \
1150         *p++ = htonl((u32)(n));                                 \
1151 } while (0)
1152 #define WRITEMEM(ptr,nbytes)     do if (nbytes > 0) {           \
1153         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1154         memcpy(p, ptr, nbytes);                                 \
1155         p += XDR_QUADLEN(nbytes);                               \
1156 } while (0)
1157 #define WRITECINFO(c)           do {                            \
1158         *p++ = htonl(c.atomic);                                 \
1159         *p++ = htonl(c.before_ctime_sec);                               \
1160         *p++ = htonl(c.before_ctime_nsec);                              \
1161         *p++ = htonl(c.after_ctime_sec);                                \
1162         *p++ = htonl(c.after_ctime_nsec);                               \
1163 } while (0)
1164
1165 #define RESERVE_SPACE(nbytes)   do {                            \
1166         p = resp->p;                                            \
1167         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1168 } while (0)
1169 #define ADJUST_ARGS()           resp->p = p
1170
1171 /*
1172  * Header routine to setup seqid operation replay cache
1173  */
1174 #define ENCODE_SEQID_OP_HEAD                                    \
1175         __be32 *p;                                              \
1176         __be32 *save;                                           \
1177                                                                 \
1178         save = resp->p;
1179
1180 /*
1181  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1182  * is where sequence id's are incremented, and the replay cache is filled.
1183  * Note that we increment sequence id's here, at the last moment, so we're sure
1184  * we know whether the error to be returned is a sequence id mutating error.
1185  */
1186
1187 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1188         if (seqid_mutating_err(nfserr) && stateowner) {         \
1189                 stateowner->so_seqid++;                         \
1190                 stateowner->so_replay.rp_status = nfserr;       \
1191                 stateowner->so_replay.rp_buflen =               \
1192                           (((char *)(resp)->p - (char *)save)); \
1193                 memcpy(stateowner->so_replay.rp_buf, save,      \
1194                         stateowner->so_replay.rp_buflen);       \
1195         } } while (0);
1196
1197 /* Encode as an array of strings the string given with components
1198  * seperated @sep.
1199  */
1200 static __be32 nfsd4_encode_components(char sep, char *components,
1201                                    __be32 **pp, int *buflen)
1202 {
1203         __be32 *p = *pp;
1204         __be32 *countp = p;
1205         int strlen, count=0;
1206         char *str, *end;
1207
1208         dprintk("nfsd4_encode_components(%s)\n", components);
1209         if ((*buflen -= 4) < 0)
1210                 return nfserr_resource;
1211         WRITE32(0); /* We will fill this in with @count later */
1212         end = str = components;
1213         while (*end) {
1214                 for (; *end && (*end != sep); end++)
1215                         ; /* Point to end of component */
1216                 strlen = end - str;
1217                 if (strlen) {
1218                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1219                                 return nfserr_resource;
1220                         WRITE32(strlen);
1221                         WRITEMEM(str, strlen);
1222                         count++;
1223                 }
1224                 else
1225                         end++;
1226                 str = end;
1227         }
1228         *pp = p;
1229         p = countp;
1230         WRITE32(count);
1231         return 0;
1232 }
1233
1234 /*
1235  * encode a location element of a fs_locations structure
1236  */
1237 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1238                                     __be32 **pp, int *buflen)
1239 {
1240         __be32 status;
1241         __be32 *p = *pp;
1242
1243         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1244         if (status)
1245                 return status;
1246         status = nfsd4_encode_components('/', location->path, &p, buflen);
1247         if (status)
1248                 return status;
1249         *pp = p;
1250         return 0;
1251 }
1252
1253 /*
1254  * Return the path to an export point in the pseudo filesystem namespace
1255  * Returned string is safe to use as long as the caller holds a reference
1256  * to @exp.
1257  */
1258 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1259 {
1260         struct svc_fh tmp_fh;
1261         char *path, *rootpath;
1262
1263         fh_init(&tmp_fh, NFS4_FHSIZE);
1264         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1265         if (*stat)
1266                 return NULL;
1267         rootpath = tmp_fh.fh_export->ex_pathname;
1268
1269         path = exp->ex_pathname;
1270
1271         if (strncmp(path, rootpath, strlen(rootpath))) {
1272                 dprintk("nfsd: fs_locations failed;"
1273                         "%s is not contained in %s\n", path, rootpath);
1274                 *stat = nfserr_notsupp;
1275                 return NULL;
1276         }
1277
1278         return path + strlen(rootpath);
1279 }
1280
1281 /*
1282  *  encode a fs_locations structure
1283  */
1284 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1285                                      struct svc_export *exp,
1286                                      __be32 **pp, int *buflen)
1287 {
1288         __be32 status;
1289         int i;
1290         __be32 *p = *pp;
1291         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1292         char *root = nfsd4_path(rqstp, exp, &status);
1293
1294         if (status)
1295                 return status;
1296         status = nfsd4_encode_components('/', root, &p, buflen);
1297         if (status)
1298                 return status;
1299         if ((*buflen -= 4) < 0)
1300                 return nfserr_resource;
1301         WRITE32(fslocs->locations_count);
1302         for (i=0; i<fslocs->locations_count; i++) {
1303                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1304                                                    &p, buflen);
1305                 if (status)
1306                         return status;
1307         }
1308         *pp = p;
1309         return 0;
1310 }
1311
1312 static u32 nfs4_ftypes[16] = {
1313         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1314         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1315         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1316         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1317 };
1318
1319 static __be32
1320 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1321                         __be32 **p, int *buflen)
1322 {
1323         int status;
1324
1325         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1326                 return nfserr_resource;
1327         if (whotype != NFS4_ACL_WHO_NAMED)
1328                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1329         else if (group)
1330                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1331         else
1332                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1333         if (status < 0)
1334                 return nfserrno(status);
1335         *p = xdr_encode_opaque(*p, NULL, status);
1336         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1337         BUG_ON(*buflen < 0);
1338         return 0;
1339 }
1340
1341 static inline __be32
1342 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1343 {
1344         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1345 }
1346
1347 static inline __be32
1348 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1349 {
1350         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1351 }
1352
1353 static inline __be32
1354 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1355                 __be32 **p, int *buflen)
1356 {
1357         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1358 }
1359
1360 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1361                               FATTR4_WORD0_RDATTR_ERROR)
1362 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1363
1364 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1365 {
1366         /* As per referral draft:  */
1367         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1368             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1369                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1370                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1371                         *rdattr_err = NFSERR_MOVED;
1372                 else
1373                         return nfserr_moved;
1374         }
1375         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1376         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1377         return 0;
1378 }
1379
1380 /*
1381  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1382  * ourselves.
1383  *
1384  * @countp is the buffer size in _words_; upon successful return this becomes
1385  * replaced with the number of words written.
1386  */
1387 __be32
1388 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1389                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1390                 struct svc_rqst *rqstp, int ignore_crossmnt)
1391 {
1392         u32 bmval0 = bmval[0];
1393         u32 bmval1 = bmval[1];
1394         struct kstat stat;
1395         struct svc_fh tempfh;
1396         struct kstatfs statfs;
1397         int buflen = *countp << 2;
1398         __be32 *attrlenp;
1399         u32 dummy;
1400         u64 dummy64;
1401         u32 rdattr_err = 0;
1402         __be32 *p = buffer;
1403         __be32 status;
1404         int err;
1405         int aclsupport = 0;
1406         struct nfs4_acl *acl = NULL;
1407
1408         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1409         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1410         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1411
1412         if (exp->ex_fslocs.migrated) {
1413                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1414                 if (status)
1415                         goto out;
1416         }
1417
1418         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1419         if (err)
1420                 goto out_nfserr;
1421         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1422                         FATTR4_WORD0_MAXNAME)) ||
1423             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1424                        FATTR4_WORD1_SPACE_TOTAL))) {
1425                 err = vfs_statfs(dentry, &statfs);
1426                 if (err)
1427                         goto out_nfserr;
1428         }
1429         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1430                 fh_init(&tempfh, NFS4_FHSIZE);
1431                 status = fh_compose(&tempfh, exp, dentry, NULL);
1432                 if (status)
1433                         goto out;
1434                 fhp = &tempfh;
1435         }
1436         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1437                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1438                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1439                 aclsupport = (err == 0);
1440                 if (bmval0 & FATTR4_WORD0_ACL) {
1441                         if (err == -EOPNOTSUPP)
1442                                 bmval0 &= ~FATTR4_WORD0_ACL;
1443                         else if (err == -EINVAL) {
1444                                 status = nfserr_attrnotsupp;
1445                                 goto out;
1446                         } else if (err != 0)
1447                                 goto out_nfserr;
1448                 }
1449         }
1450         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1451                 if (exp->ex_fslocs.locations == NULL) {
1452                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1453                 }
1454         }
1455         if ((buflen -= 16) < 0)
1456                 goto out_resource;
1457
1458         WRITE32(2);
1459         WRITE32(bmval0);
1460         WRITE32(bmval1);
1461         attrlenp = p++;                /* to be backfilled later */
1462
1463         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1464                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1465                 if ((buflen -= 12) < 0)
1466                         goto out_resource;
1467                 if (!aclsupport)
1468                         word0 &= ~FATTR4_WORD0_ACL;
1469                 if (!exp->ex_fslocs.locations)
1470                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1471                 WRITE32(2);
1472                 WRITE32(word0);
1473                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1474         }
1475         if (bmval0 & FATTR4_WORD0_TYPE) {
1476                 if ((buflen -= 4) < 0)
1477                         goto out_resource;
1478                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1479                 if (dummy == NF4BAD)
1480                         goto out_serverfault;
1481                 WRITE32(dummy);
1482         }
1483         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1484                 if ((buflen -= 4) < 0)
1485                         goto out_resource;
1486                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1487                         WRITE32(NFS4_FH_PERSISTENT);
1488                 else
1489                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1490         }
1491         if (bmval0 & FATTR4_WORD0_CHANGE) {
1492                 /*
1493                  * Note: This _must_ be consistent with the scheme for writing
1494                  * change_info, so any changes made here must be reflected there
1495                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1496                  * macro above.)
1497                  */
1498                 if ((buflen -= 8) < 0)
1499                         goto out_resource;
1500                 WRITE32(stat.ctime.tv_sec);
1501                 WRITE32(stat.ctime.tv_nsec);
1502         }
1503         if (bmval0 & FATTR4_WORD0_SIZE) {
1504                 if ((buflen -= 8) < 0)
1505                         goto out_resource;
1506                 WRITE64(stat.size);
1507         }
1508         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1509                 if ((buflen -= 4) < 0)
1510                         goto out_resource;
1511                 WRITE32(1);
1512         }
1513         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1514                 if ((buflen -= 4) < 0)
1515                         goto out_resource;
1516                 WRITE32(1);
1517         }
1518         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1519                 if ((buflen -= 4) < 0)
1520                         goto out_resource;
1521                 WRITE32(0);
1522         }
1523         if (bmval0 & FATTR4_WORD0_FSID) {
1524                 if ((buflen -= 16) < 0)
1525                         goto out_resource;
1526                 if (exp->ex_fslocs.migrated) {
1527                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1528                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1529                 } else switch(fsid_source(fhp)) {
1530                 case FSIDSOURCE_FSID:
1531                         WRITE64((u64)exp->ex_fsid);
1532                         WRITE64((u64)0);
1533                         break;
1534                 case FSIDSOURCE_DEV:
1535                         WRITE32(0);
1536                         WRITE32(MAJOR(stat.dev));
1537                         WRITE32(0);
1538                         WRITE32(MINOR(stat.dev));
1539                         break;
1540                 case FSIDSOURCE_UUID:
1541                         WRITEMEM(exp->ex_uuid, 16);
1542                         break;
1543                 }
1544         }
1545         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1546                 if ((buflen -= 4) < 0)
1547                         goto out_resource;
1548                 WRITE32(0);
1549         }
1550         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1551                 if ((buflen -= 4) < 0)
1552                         goto out_resource;
1553                 WRITE32(NFSD_LEASE_TIME);
1554         }
1555         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1556                 if ((buflen -= 4) < 0)
1557                         goto out_resource;
1558                 WRITE32(rdattr_err);
1559         }
1560         if (bmval0 & FATTR4_WORD0_ACL) {
1561                 struct nfs4_ace *ace;
1562
1563                 if (acl == NULL) {
1564                         if ((buflen -= 4) < 0)
1565                                 goto out_resource;
1566
1567                         WRITE32(0);
1568                         goto out_acl;
1569                 }
1570                 if ((buflen -= 4) < 0)
1571                         goto out_resource;
1572                 WRITE32(acl->naces);
1573
1574                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1575                         if ((buflen -= 4*3) < 0)
1576                                 goto out_resource;
1577                         WRITE32(ace->type);
1578                         WRITE32(ace->flag);
1579                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1580                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1581                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1582                                 &p, &buflen);
1583                         if (status == nfserr_resource)
1584                                 goto out_resource;
1585                         if (status)
1586                                 goto out;
1587                 }
1588         }
1589 out_acl:
1590         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1591                 if ((buflen -= 4) < 0)
1592                         goto out_resource;
1593                 WRITE32(aclsupport ?
1594                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1595         }
1596         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1597                 if ((buflen -= 4) < 0)
1598                         goto out_resource;
1599                 WRITE32(1);
1600         }
1601         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1602                 if ((buflen -= 4) < 0)
1603                         goto out_resource;
1604                 WRITE32(1);
1605         }
1606         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1607                 if ((buflen -= 4) < 0)
1608                         goto out_resource;
1609                 WRITE32(1);
1610         }
1611         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1612                 if ((buflen -= 4) < 0)
1613                         goto out_resource;
1614                 WRITE32(1);
1615         }
1616         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1617                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1618                 if (buflen < 0)
1619                         goto out_resource;
1620                 WRITE32(fhp->fh_handle.fh_size);
1621                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1622         }
1623         if (bmval0 & FATTR4_WORD0_FILEID) {
1624                 if ((buflen -= 8) < 0)
1625                         goto out_resource;
1626                 WRITE64(stat.ino);
1627         }
1628         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1629                 if ((buflen -= 8) < 0)
1630                         goto out_resource;
1631                 WRITE64((u64) statfs.f_ffree);
1632         }
1633         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1634                 if ((buflen -= 8) < 0)
1635                         goto out_resource;
1636                 WRITE64((u64) statfs.f_ffree);
1637         }
1638         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1639                 if ((buflen -= 8) < 0)
1640                         goto out_resource;
1641                 WRITE64((u64) statfs.f_files);
1642         }
1643         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1644                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1645                 if (status == nfserr_resource)
1646                         goto out_resource;
1647                 if (status)
1648                         goto out;
1649         }
1650         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1651                 if ((buflen -= 4) < 0)
1652                         goto out_resource;
1653                 WRITE32(1);
1654         }
1655         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1656                 if ((buflen -= 8) < 0)
1657                         goto out_resource;
1658                 WRITE64(~(u64)0);
1659         }
1660         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1661                 if ((buflen -= 4) < 0)
1662                         goto out_resource;
1663                 WRITE32(255);
1664         }
1665         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1666                 if ((buflen -= 4) < 0)
1667                         goto out_resource;
1668                 WRITE32(statfs.f_namelen);
1669         }
1670         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1671                 if ((buflen -= 8) < 0)
1672                         goto out_resource;
1673                 WRITE64((u64) svc_max_payload(rqstp));
1674         }
1675         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1676                 if ((buflen -= 8) < 0)
1677                         goto out_resource;
1678                 WRITE64((u64) svc_max_payload(rqstp));
1679         }
1680         if (bmval1 & FATTR4_WORD1_MODE) {
1681                 if ((buflen -= 4) < 0)
1682                         goto out_resource;
1683                 WRITE32(stat.mode & S_IALLUGO);
1684         }
1685         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1686                 if ((buflen -= 4) < 0)
1687                         goto out_resource;
1688                 WRITE32(1);
1689         }
1690         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1691                 if ((buflen -= 4) < 0)
1692                         goto out_resource;
1693                 WRITE32(stat.nlink);
1694         }
1695         if (bmval1 & FATTR4_WORD1_OWNER) {
1696                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1697                 if (status == nfserr_resource)
1698                         goto out_resource;
1699                 if (status)
1700                         goto out;
1701         }
1702         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1703                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1704                 if (status == nfserr_resource)
1705                         goto out_resource;
1706                 if (status)
1707                         goto out;
1708         }
1709         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1710                 if ((buflen -= 8) < 0)
1711                         goto out_resource;
1712                 WRITE32((u32) MAJOR(stat.rdev));
1713                 WRITE32((u32) MINOR(stat.rdev));
1714         }
1715         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1716                 if ((buflen -= 8) < 0)
1717                         goto out_resource;
1718                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1719                 WRITE64(dummy64);
1720         }
1721         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1722                 if ((buflen -= 8) < 0)
1723                         goto out_resource;
1724                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1725                 WRITE64(dummy64);
1726         }
1727         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1728                 if ((buflen -= 8) < 0)
1729                         goto out_resource;
1730                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1731                 WRITE64(dummy64);
1732         }
1733         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1734                 if ((buflen -= 8) < 0)
1735                         goto out_resource;
1736                 dummy64 = (u64)stat.blocks << 9;
1737                 WRITE64(dummy64);
1738         }
1739         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1740                 if ((buflen -= 12) < 0)
1741                         goto out_resource;
1742                 WRITE32(0);
1743                 WRITE32(stat.atime.tv_sec);
1744                 WRITE32(stat.atime.tv_nsec);
1745         }
1746         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1747                 if ((buflen -= 12) < 0)
1748                         goto out_resource;
1749                 WRITE32(0);
1750                 WRITE32(1);
1751                 WRITE32(0);
1752         }
1753         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1754                 if ((buflen -= 12) < 0)
1755                         goto out_resource;
1756                 WRITE32(0);
1757                 WRITE32(stat.ctime.tv_sec);
1758                 WRITE32(stat.ctime.tv_nsec);
1759         }
1760         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1761                 if ((buflen -= 12) < 0)
1762                         goto out_resource;
1763                 WRITE32(0);
1764                 WRITE32(stat.mtime.tv_sec);
1765                 WRITE32(stat.mtime.tv_nsec);
1766         }
1767         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1768                 if ((buflen -= 8) < 0)
1769                         goto out_resource;
1770                 /*
1771                  * Get parent's attributes if not ignoring crossmount
1772                  * and this is the root of a cross-mounted filesystem.
1773                  */
1774                 if (ignore_crossmnt == 0 &&
1775                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
1776                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
1777                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
1778                         if (err)
1779                                 goto out_nfserr;
1780                 }
1781                 WRITE64(stat.ino);
1782         }
1783         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1784         *countp = p - buffer;
1785         status = nfs_ok;
1786
1787 out:
1788         kfree(acl);
1789         if (fhp == &tempfh)
1790                 fh_put(&tempfh);
1791         return status;
1792 out_nfserr:
1793         status = nfserrno(err);
1794         goto out;
1795 out_resource:
1796         *countp = 0;
1797         status = nfserr_resource;
1798         goto out;
1799 out_serverfault:
1800         status = nfserr_serverfault;
1801         goto out;
1802 }
1803
1804 static inline int attributes_need_mount(u32 *bmval)
1805 {
1806         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
1807                 return 1;
1808         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
1809                 return 1;
1810         return 0;
1811 }
1812
1813 static __be32
1814 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1815                 const char *name, int namlen, __be32 *p, int *buflen)
1816 {
1817         struct svc_export *exp = cd->rd_fhp->fh_export;
1818         struct dentry *dentry;
1819         __be32 nfserr;
1820         int ignore_crossmnt = 0;
1821
1822         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1823         if (IS_ERR(dentry))
1824                 return nfserrno(PTR_ERR(dentry));
1825
1826         exp_get(exp);
1827         /*
1828          * In the case of a mountpoint, the client may be asking for
1829          * attributes that are only properties of the underlying filesystem
1830          * as opposed to the cross-mounted file system. In such a case,
1831          * we will not follow the cross mount and will fill the attribtutes
1832          * directly from the mountpoint dentry.
1833          */
1834         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
1835                 ignore_crossmnt = 1;
1836         else if (d_mountpoint(dentry)) {
1837                 int err;
1838
1839                 /*
1840                  * Why the heck aren't we just using nfsd_lookup??
1841                  * Different "."/".." handling?  Something else?
1842                  * At least, add a comment here to explain....
1843                  */
1844                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1845                 if (err) {
1846                         nfserr = nfserrno(err);
1847                         goto out_put;
1848                 }
1849                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
1850                 if (nfserr)
1851                         goto out_put;
1852
1853         }
1854         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1855                                         cd->rd_rqstp, ignore_crossmnt);
1856 out_put:
1857         dput(dentry);
1858         exp_put(exp);
1859         return nfserr;
1860 }
1861
1862 static __be32 *
1863 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1864 {
1865         __be32 *attrlenp;
1866
1867         if (buflen < 6)
1868                 return NULL;
1869         *p++ = htonl(2);
1870         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1871         *p++ = htonl(0);                         /* bmval1 */
1872
1873         attrlenp = p++;
1874         *p++ = nfserr;       /* no htonl */
1875         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1876         return p;
1877 }
1878
1879 static int
1880 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1881                     loff_t offset, u64 ino, unsigned int d_type)
1882 {
1883         struct readdir_cd *ccd = ccdv;
1884         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1885         int buflen;
1886         __be32 *p = cd->buffer;
1887         __be32 nfserr = nfserr_toosmall;
1888
1889         /* In nfsv4, "." and ".." never make it onto the wire.. */
1890         if (name && isdotent(name, namlen)) {
1891                 cd->common.err = nfs_ok;
1892                 return 0;
1893         }
1894
1895         if (cd->offset)
1896                 xdr_encode_hyper(cd->offset, (u64) offset);
1897
1898         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1899         if (buflen < 0)
1900                 goto fail;
1901
1902         *p++ = xdr_one;                             /* mark entry present */
1903         cd->offset = p;                             /* remember pointer */
1904         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1905         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1906
1907         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1908         switch (nfserr) {
1909         case nfs_ok:
1910                 p += buflen;
1911                 break;
1912         case nfserr_resource:
1913                 nfserr = nfserr_toosmall;
1914                 goto fail;
1915         case nfserr_dropit:
1916                 goto fail;
1917         default:
1918                 /*
1919                  * If the client requested the RDATTR_ERROR attribute,
1920                  * we stuff the error code into this attribute
1921                  * and continue.  If this attribute was not requested,
1922                  * then in accordance with the spec, we fail the
1923                  * entire READDIR operation(!)
1924                  */
1925                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1926                         goto fail;
1927                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1928                 if (p == NULL) {
1929                         nfserr = nfserr_toosmall;
1930                         goto fail;
1931                 }
1932         }
1933         cd->buflen -= (p - cd->buffer);
1934         cd->buffer = p;
1935         cd->common.err = nfs_ok;
1936         return 0;
1937 fail:
1938         cd->common.err = nfserr;
1939         return -EINVAL;
1940 }
1941
1942 static void
1943 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1944 {
1945         ENCODE_HEAD;
1946
1947         if (!nfserr) {
1948                 RESERVE_SPACE(8);
1949                 WRITE32(access->ac_supported);
1950                 WRITE32(access->ac_resp_access);
1951                 ADJUST_ARGS();
1952         }
1953 }
1954
1955 static void
1956 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1957 {
1958         ENCODE_SEQID_OP_HEAD;
1959
1960         if (!nfserr) {
1961                 RESERVE_SPACE(sizeof(stateid_t));
1962                 WRITE32(close->cl_stateid.si_generation);
1963                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1964                 ADJUST_ARGS();
1965         }
1966         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1967 }
1968
1969
1970 static void
1971 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
1972 {
1973         ENCODE_HEAD;
1974
1975         if (!nfserr) {
1976                 RESERVE_SPACE(8);
1977                 WRITEMEM(commit->co_verf.data, 8);
1978                 ADJUST_ARGS();
1979         }
1980 }
1981
1982 static void
1983 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
1984 {
1985         ENCODE_HEAD;
1986
1987         if (!nfserr) {
1988                 RESERVE_SPACE(32);
1989                 WRITECINFO(create->cr_cinfo);
1990                 WRITE32(2);
1991                 WRITE32(create->cr_bmval[0]);
1992                 WRITE32(create->cr_bmval[1]);
1993                 ADJUST_ARGS();
1994         }
1995 }
1996
1997 static __be32
1998 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
1999 {
2000         struct svc_fh *fhp = getattr->ga_fhp;
2001         int buflen;
2002
2003         if (nfserr)
2004                 return nfserr;
2005
2006         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2007         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2008                                     resp->p, &buflen, getattr->ga_bmval,
2009                                     resp->rqstp, 0);
2010         if (!nfserr)
2011                 resp->p += buflen;
2012         return nfserr;
2013 }
2014
2015 static void
2016 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh *fhp)
2017 {
2018         unsigned int len;
2019         ENCODE_HEAD;
2020
2021         if (!nfserr) {
2022                 len = fhp->fh_handle.fh_size;
2023                 RESERVE_SPACE(len + 4);
2024                 WRITE32(len);
2025                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2026                 ADJUST_ARGS();
2027         }
2028 }
2029
2030 /*
2031 * Including all fields other than the name, a LOCK4denied structure requires
2032 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2033 */
2034 static void
2035 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2036 {
2037         ENCODE_HEAD;
2038
2039         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2040         WRITE64(ld->ld_start);
2041         WRITE64(ld->ld_length);
2042         WRITE32(ld->ld_type);
2043         if (ld->ld_sop) {
2044                 WRITEMEM(&ld->ld_clientid, 8);
2045                 WRITE32(ld->ld_sop->so_owner.len);
2046                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2047                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2048         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2049                 WRITE64((u64)0); /* clientid */
2050                 WRITE32(0); /* length of owner name */
2051         }
2052         ADJUST_ARGS();
2053 }
2054
2055 static void
2056 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2057 {
2058         ENCODE_SEQID_OP_HEAD;
2059
2060         if (!nfserr) {
2061                 RESERVE_SPACE(4 + sizeof(stateid_t));
2062                 WRITE32(lock->lk_resp_stateid.si_generation);
2063                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2064                 ADJUST_ARGS();
2065         } else if (nfserr == nfserr_denied)
2066                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2067
2068         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2069 }
2070
2071 static void
2072 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2073 {
2074         if (nfserr == nfserr_denied)
2075                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2076 }
2077
2078 static void
2079 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2080 {
2081         ENCODE_SEQID_OP_HEAD;
2082
2083         if (!nfserr) {
2084                 RESERVE_SPACE(sizeof(stateid_t));
2085                 WRITE32(locku->lu_stateid.si_generation);
2086                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2087                 ADJUST_ARGS();
2088         }
2089
2090         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2091 }
2092
2093
2094 static void
2095 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2096 {
2097         ENCODE_HEAD;
2098
2099         if (!nfserr) {
2100                 RESERVE_SPACE(20);
2101                 WRITECINFO(link->li_cinfo);
2102                 ADJUST_ARGS();
2103         }
2104 }
2105
2106
2107 static void
2108 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2109 {
2110         ENCODE_SEQID_OP_HEAD;
2111
2112         if (nfserr)
2113                 goto out;
2114
2115         RESERVE_SPACE(36 + sizeof(stateid_t));
2116         WRITE32(open->op_stateid.si_generation);
2117         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2118         WRITECINFO(open->op_cinfo);
2119         WRITE32(open->op_rflags);
2120         WRITE32(2);
2121         WRITE32(open->op_bmval[0]);
2122         WRITE32(open->op_bmval[1]);
2123         WRITE32(open->op_delegate_type);
2124         ADJUST_ARGS();
2125
2126         switch (open->op_delegate_type) {
2127         case NFS4_OPEN_DELEGATE_NONE:
2128                 break;
2129         case NFS4_OPEN_DELEGATE_READ:
2130                 RESERVE_SPACE(20 + sizeof(stateid_t));
2131                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2132                 WRITE32(open->op_recall);
2133
2134                 /*
2135                  * TODO: ACE's in delegations
2136                  */
2137                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2138                 WRITE32(0);
2139                 WRITE32(0);
2140                 WRITE32(0);   /* XXX: is NULL principal ok? */
2141                 ADJUST_ARGS();
2142                 break;
2143         case NFS4_OPEN_DELEGATE_WRITE:
2144                 RESERVE_SPACE(32 + sizeof(stateid_t));
2145                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2146                 WRITE32(0);
2147
2148                 /*
2149                  * TODO: space_limit's in delegations
2150                  */
2151                 WRITE32(NFS4_LIMIT_SIZE);
2152                 WRITE32(~(u32)0);
2153                 WRITE32(~(u32)0);
2154
2155                 /*
2156                  * TODO: ACE's in delegations
2157                  */
2158                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2159                 WRITE32(0);
2160                 WRITE32(0);
2161                 WRITE32(0);   /* XXX: is NULL principal ok? */
2162                 ADJUST_ARGS();
2163                 break;
2164         default:
2165                 BUG();
2166         }
2167         /* XXX save filehandle here */
2168 out:
2169         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2170 }
2171
2172 static void
2173 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2174 {
2175         ENCODE_SEQID_OP_HEAD;
2176
2177         if (!nfserr) {
2178                 RESERVE_SPACE(sizeof(stateid_t));
2179                 WRITE32(oc->oc_resp_stateid.si_generation);
2180                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2181                 ADJUST_ARGS();
2182         }
2183
2184         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2185 }
2186
2187 static void
2188 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2189 {
2190         ENCODE_SEQID_OP_HEAD;
2191
2192         if (!nfserr) {
2193                 RESERVE_SPACE(sizeof(stateid_t));
2194                 WRITE32(od->od_stateid.si_generation);
2195                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2196                 ADJUST_ARGS();
2197         }
2198
2199         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2200 }
2201
2202 static __be32
2203 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2204                   struct nfsd4_read *read)
2205 {
2206         u32 eof;
2207         int v, pn;
2208         unsigned long maxcount;
2209         long len;
2210         ENCODE_HEAD;
2211
2212         if (nfserr)
2213                 return nfserr;
2214         if (resp->xbuf->page_len)
2215                 return nfserr_resource;
2216
2217         RESERVE_SPACE(8); /* eof flag and byte count */
2218
2219         maxcount = svc_max_payload(resp->rqstp);
2220         if (maxcount > read->rd_length)
2221                 maxcount = read->rd_length;
2222
2223         len = maxcount;
2224         v = 0;
2225         while (len > 0) {
2226                 pn = resp->rqstp->rq_resused++;
2227                 resp->rqstp->rq_vec[v].iov_base =
2228                         page_address(resp->rqstp->rq_respages[pn]);
2229                 resp->rqstp->rq_vec[v].iov_len =
2230                         len < PAGE_SIZE ? len : PAGE_SIZE;
2231                 v++;
2232                 len -= PAGE_SIZE;
2233         }
2234         read->rd_vlen = v;
2235
2236         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2237                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2238                         &maxcount);
2239
2240         if (nfserr == nfserr_symlink)
2241                 nfserr = nfserr_inval;
2242         if (nfserr)
2243                 return nfserr;
2244         eof = (read->rd_offset + maxcount >=
2245                read->rd_fhp->fh_dentry->d_inode->i_size);
2246
2247         WRITE32(eof);
2248         WRITE32(maxcount);
2249         ADJUST_ARGS();
2250         resp->xbuf->head[0].iov_len = (char*)p
2251                                         - (char*)resp->xbuf->head[0].iov_base;
2252         resp->xbuf->page_len = maxcount;
2253
2254         /* Use rest of head for padding and remaining ops: */
2255         resp->xbuf->tail[0].iov_base = p;
2256         resp->xbuf->tail[0].iov_len = 0;
2257         if (maxcount&3) {
2258                 RESERVE_SPACE(4);
2259                 WRITE32(0);
2260                 resp->xbuf->tail[0].iov_base += maxcount&3;
2261                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2262                 ADJUST_ARGS();
2263         }
2264         return 0;
2265 }
2266
2267 static __be32
2268 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2269 {
2270         int maxcount;
2271         char *page;
2272         ENCODE_HEAD;
2273
2274         if (nfserr)
2275                 return nfserr;
2276         if (resp->xbuf->page_len)
2277                 return nfserr_resource;
2278
2279         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2280
2281         maxcount = PAGE_SIZE;
2282         RESERVE_SPACE(4);
2283
2284         /*
2285          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2286          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2287          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2288          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2289          */
2290         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2291         if (nfserr == nfserr_isdir)
2292                 return nfserr_inval;
2293         if (nfserr)
2294                 return nfserr;
2295
2296         WRITE32(maxcount);
2297         ADJUST_ARGS();
2298         resp->xbuf->head[0].iov_len = (char*)p
2299                                 - (char*)resp->xbuf->head[0].iov_base;
2300         resp->xbuf->page_len = maxcount;
2301
2302         /* Use rest of head for padding and remaining ops: */
2303         resp->xbuf->tail[0].iov_base = p;
2304         resp->xbuf->tail[0].iov_len = 0;
2305         if (maxcount&3) {
2306                 RESERVE_SPACE(4);
2307                 WRITE32(0);
2308                 resp->xbuf->tail[0].iov_base += maxcount&3;
2309                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2310                 ADJUST_ARGS();
2311         }
2312         return 0;
2313 }
2314
2315 static __be32
2316 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2317 {
2318         int maxcount;
2319         loff_t offset;
2320         __be32 *page, *savep, *tailbase;
2321         ENCODE_HEAD;
2322
2323         if (nfserr)
2324                 return nfserr;
2325         if (resp->xbuf->page_len)
2326                 return nfserr_resource;
2327
2328         RESERVE_SPACE(8);  /* verifier */
2329         savep = p;
2330
2331         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2332         WRITE32(0);
2333         WRITE32(0);
2334         ADJUST_ARGS();
2335         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2336         tailbase = p;
2337
2338         maxcount = PAGE_SIZE;
2339         if (maxcount > readdir->rd_maxcount)
2340                 maxcount = readdir->rd_maxcount;
2341
2342         /*
2343          * Convert from bytes to words, account for the two words already
2344          * written, make sure to leave two words at the end for the next
2345          * pointer and eof field.
2346          */
2347         maxcount = (maxcount >> 2) - 4;
2348         if (maxcount < 0) {
2349                 nfserr =  nfserr_toosmall;
2350                 goto err_no_verf;
2351         }
2352
2353         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2354         readdir->common.err = 0;
2355         readdir->buflen = maxcount;
2356         readdir->buffer = page;
2357         readdir->offset = NULL;
2358
2359         offset = readdir->rd_cookie;
2360         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2361                               &offset,
2362                               &readdir->common, nfsd4_encode_dirent);
2363         if (nfserr == nfs_ok &&
2364             readdir->common.err == nfserr_toosmall &&
2365             readdir->buffer == page)
2366                 nfserr = nfserr_toosmall;
2367         if (nfserr == nfserr_symlink)
2368                 nfserr = nfserr_notdir;
2369         if (nfserr)
2370                 goto err_no_verf;
2371
2372         if (readdir->offset)
2373                 xdr_encode_hyper(readdir->offset, offset);
2374
2375         p = readdir->buffer;
2376         *p++ = 0;       /* no more entries */
2377         *p++ = htonl(readdir->common.err == nfserr_eof);
2378         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2379                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2380
2381         /* Use rest of head for padding and remaining ops: */
2382         resp->xbuf->tail[0].iov_base = tailbase;
2383         resp->xbuf->tail[0].iov_len = 0;
2384         resp->p = resp->xbuf->tail[0].iov_base;
2385         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2386
2387         return 0;
2388 err_no_verf:
2389         p = savep;
2390         ADJUST_ARGS();
2391         return nfserr;
2392 }
2393
2394 static void
2395 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2396 {
2397         ENCODE_HEAD;
2398
2399         if (!nfserr) {
2400                 RESERVE_SPACE(20);
2401                 WRITECINFO(remove->rm_cinfo);
2402                 ADJUST_ARGS();
2403         }
2404 }
2405
2406 static void
2407 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2408 {
2409         ENCODE_HEAD;
2410
2411         if (!nfserr) {
2412                 RESERVE_SPACE(40);
2413                 WRITECINFO(rename->rn_sinfo);
2414                 WRITECINFO(rename->rn_tinfo);
2415                 ADJUST_ARGS();
2416         }
2417 }
2418
2419 static void
2420 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2421                      struct nfsd4_secinfo *secinfo)
2422 {
2423         int i = 0;
2424         struct svc_export *exp = secinfo->si_exp;
2425         u32 nflavs;
2426         struct exp_flavor_info *flavs;
2427         struct exp_flavor_info def_flavs[2];
2428         ENCODE_HEAD;
2429
2430         if (nfserr)
2431                 goto out;
2432         if (exp->ex_nflavors) {
2433                 flavs = exp->ex_flavors;
2434                 nflavs = exp->ex_nflavors;
2435         } else { /* Handling of some defaults in absence of real secinfo: */
2436                 flavs = def_flavs;
2437                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2438                         nflavs = 2;
2439                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2440                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2441                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2442                         nflavs = 1;
2443                         flavs[0].pseudoflavor
2444                                         = svcauth_gss_flavor(exp->ex_client);
2445                 } else {
2446                         nflavs = 1;
2447                         flavs[0].pseudoflavor
2448                                         = exp->ex_client->flavour->flavour;
2449                 }
2450         }
2451
2452         RESERVE_SPACE(4);
2453         WRITE32(nflavs);
2454         ADJUST_ARGS();
2455         for (i = 0; i < nflavs; i++) {
2456                 u32 flav = flavs[i].pseudoflavor;
2457                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2458
2459                 if (gm) {
2460                         RESERVE_SPACE(4);
2461                         WRITE32(RPC_AUTH_GSS);
2462                         ADJUST_ARGS();
2463                         RESERVE_SPACE(4 + gm->gm_oid.len);
2464                         WRITE32(gm->gm_oid.len);
2465                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2466                         ADJUST_ARGS();
2467                         RESERVE_SPACE(4);
2468                         WRITE32(0); /* qop */
2469                         ADJUST_ARGS();
2470                         RESERVE_SPACE(4);
2471                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2472                         ADJUST_ARGS();
2473                         gss_mech_put(gm);
2474                 } else {
2475                         RESERVE_SPACE(4);
2476                         WRITE32(flav);
2477                         ADJUST_ARGS();
2478                 }
2479         }
2480 out:
2481         if (exp)
2482                 exp_put(exp);
2483 }
2484
2485 /*
2486  * The SETATTR encode routine is special -- it always encodes a bitmap,
2487  * regardless of the error status.
2488  */
2489 static void
2490 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2491 {
2492         ENCODE_HEAD;
2493
2494         RESERVE_SPACE(12);
2495         if (nfserr) {
2496                 WRITE32(2);
2497                 WRITE32(0);
2498                 WRITE32(0);
2499         }
2500         else {
2501                 WRITE32(2);
2502                 WRITE32(setattr->sa_bmval[0]);
2503                 WRITE32(setattr->sa_bmval[1]);
2504         }
2505         ADJUST_ARGS();
2506 }
2507
2508 static void
2509 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2510 {
2511         ENCODE_HEAD;
2512
2513         if (!nfserr) {
2514                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2515                 WRITEMEM(&scd->se_clientid, 8);
2516                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2517                 ADJUST_ARGS();
2518         }
2519         else if (nfserr == nfserr_clid_inuse) {
2520                 RESERVE_SPACE(8);
2521                 WRITE32(0);
2522                 WRITE32(0);
2523                 ADJUST_ARGS();
2524         }
2525 }
2526
2527 static void
2528 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2529 {
2530         ENCODE_HEAD;
2531
2532         if (!nfserr) {
2533                 RESERVE_SPACE(16);
2534                 WRITE32(write->wr_bytes_written);
2535                 WRITE32(write->wr_how_written);
2536                 WRITEMEM(write->wr_verifier.data, 8);
2537                 ADJUST_ARGS();
2538         }
2539 }
2540
2541 void
2542 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2543 {
2544         __be32 *statp;
2545         ENCODE_HEAD;
2546
2547         RESERVE_SPACE(8);
2548         WRITE32(op->opnum);
2549         statp = p++;    /* to be backfilled at the end */
2550         ADJUST_ARGS();
2551
2552         switch (op->opnum) {
2553         case OP_ACCESS:
2554                 nfsd4_encode_access(resp, op->status, &op->u.access);
2555                 break;
2556         case OP_CLOSE:
2557                 nfsd4_encode_close(resp, op->status, &op->u.close);
2558                 break;
2559         case OP_COMMIT:
2560                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2561                 break;
2562         case OP_CREATE:
2563                 nfsd4_encode_create(resp, op->status, &op->u.create);
2564                 break;
2565         case OP_DELEGRETURN:
2566                 break;
2567         case OP_GETATTR:
2568                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2569                 break;
2570         case OP_GETFH:
2571                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2572                 break;
2573         case OP_LINK:
2574                 nfsd4_encode_link(resp, op->status, &op->u.link);
2575                 break;
2576         case OP_LOCK:
2577                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2578                 break;
2579         case OP_LOCKT:
2580                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2581                 break;
2582         case OP_LOCKU:
2583                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2584                 break;
2585         case OP_LOOKUP:
2586                 break;
2587         case OP_LOOKUPP:
2588                 break;
2589         case OP_NVERIFY:
2590                 break;
2591         case OP_OPEN:
2592                 nfsd4_encode_open(resp, op->status, &op->u.open);
2593                 break;
2594         case OP_OPEN_CONFIRM:
2595                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2596                 break;
2597         case OP_OPEN_DOWNGRADE:
2598                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2599                 break;
2600         case OP_PUTFH:
2601                 break;
2602         case OP_PUTROOTFH:
2603                 break;
2604         case OP_READ:
2605                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2606                 break;
2607         case OP_READDIR:
2608                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2609                 break;
2610         case OP_READLINK:
2611                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2612                 break;
2613         case OP_REMOVE:
2614                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2615                 break;
2616         case OP_RENAME:
2617                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2618                 break;
2619         case OP_RENEW:
2620                 break;
2621         case OP_RESTOREFH:
2622                 break;
2623         case OP_SAVEFH:
2624                 break;
2625         case OP_SECINFO:
2626                 nfsd4_encode_secinfo(resp, op->status, &op->u.secinfo);
2627                 break;
2628         case OP_SETATTR:
2629                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2630                 break;
2631         case OP_SETCLIENTID:
2632                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2633                 break;
2634         case OP_SETCLIENTID_CONFIRM:
2635                 break;
2636         case OP_VERIFY:
2637                 break;
2638         case OP_WRITE:
2639                 nfsd4_encode_write(resp, op->status, &op->u.write);
2640                 break;
2641         case OP_RELEASE_LOCKOWNER:
2642                 break;
2643         default:
2644                 break;
2645         }
2646
2647         /*
2648          * Note: We write the status directly, instead of using WRITE32(),
2649          * since it is already in network byte order.
2650          */
2651         *statp = op->status;
2652 }
2653
2654 /*
2655  * Encode the reply stored in the stateowner reply cache
2656  *
2657  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2658  * previously sent already encoded operation.
2659  *
2660  * called with nfs4_lock_state() held
2661  */
2662 void
2663 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2664 {
2665         ENCODE_HEAD;
2666         struct nfs4_replay *rp = op->replay;
2667
2668         BUG_ON(!rp);
2669
2670         RESERVE_SPACE(8);
2671         WRITE32(op->opnum);
2672         *p++ = rp->rp_status;  /* already xdr'ed */
2673         ADJUST_ARGS();
2674
2675         RESERVE_SPACE(rp->rp_buflen);
2676         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2677         ADJUST_ARGS();
2678 }
2679
2680 /*
2681  * END OF "GENERIC" ENCODE ROUTINES.
2682  */
2683
2684 int
2685 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2686 {
2687         return xdr_ressize_check(rqstp, p);
2688 }
2689
2690 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2691 {
2692         if (args->ops != args->iops) {
2693                 kfree(args->ops);
2694                 args->ops = args->iops;
2695         }
2696         kfree(args->tmpp);
2697         args->tmpp = NULL;
2698         while (args->to_free) {
2699                 struct tmpbuf *tb = args->to_free;
2700                 args->to_free = tb->next;
2701                 tb->release(tb->buf);
2702                 kfree(tb);
2703         }
2704 }
2705
2706 int
2707 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2708 {
2709         __be32 status;
2710
2711         args->p = p;
2712         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2713         args->pagelist = rqstp->rq_arg.pages;
2714         args->pagelen = rqstp->rq_arg.page_len;
2715         args->tmpp = NULL;
2716         args->to_free = NULL;
2717         args->ops = args->iops;
2718         args->rqstp = rqstp;
2719
2720         status = nfsd4_decode_compound(args);
2721         if (status) {
2722                 nfsd4_release_compoundargs(args);
2723         }
2724         return !status;
2725 }
2726
2727 int
2728 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2729 {
2730         /*
2731          * All that remains is to write the tag and operation count...
2732          */
2733         struct kvec *iov;
2734         p = resp->tagp;
2735         *p++ = htonl(resp->taglen);
2736         memcpy(p, resp->tag, resp->taglen);
2737         p += XDR_QUADLEN(resp->taglen);
2738         *p++ = htonl(resp->opcnt);
2739
2740         if (rqstp->rq_res.page_len)
2741                 iov = &rqstp->rq_res.tail[0];
2742         else
2743                 iov = &rqstp->rq_res.head[0];
2744         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2745         BUG_ON(iov->iov_len > PAGE_SIZE);
2746         return 1;
2747 }
2748
2749 /*
2750  * Local variables:
2751  *  c-basic-offset: 8
2752  * End:
2753  */