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   1 /*
   2  *  fs/nfs/nfs4xdr.c
   3  *
   4  *  Server-side XDR for NFSv4
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * TODO: Neil Brown made the following observation:  We currently
  38  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  39  * never release any of that until the request is complete.
  40  * It would be good to calculate a new maximum response size while
  41  * decoding the COMPOUND, and call svc_reserve with this number
  42  * at the end of nfs4svc_decode_compoundargs.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/smp.h>
  47 #include <linux/fs.h>
  48 #include <linux/namei.h>
  49 #include <linux/vfs.h>
  50 #include <linux/sunrpc/xdr.h>
  51 #include <linux/sunrpc/svc.h>
  52 #include <linux/sunrpc/clnt.h>
  53 #include <linux/nfsd/nfsd.h>
  54 #include <linux/nfsd/state.h>
  55 #include <linux/nfsd/xdr4.h>
  56 #include <linux/nfsd_idmap.h>
  57 #include <linux/nfs4.h>
  58 #include <linux/nfs4_acl.h>
  59 #include <linux/sunrpc/gss_api.h>
  60 #include <linux/sunrpc/svcauth_gss.h>
  61
  62 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  63
  64 /*
  65  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  66  * directory in order to indicate to the client that a filesystem boundary is present
  67  * We use a fixed fsid for a referral
  68  */
  69 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  70 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  71
  72 static __be32
  73 check_filename(char *str, int len, __be32 err)
  74 {
  75         int i;
  76
  77         if (len == 0)
  78                 return nfserr_inval;
  79         if (isdotent(str, len))
  80                 return err;
  81         for (i = 0; i < len; i++)
  82                 if (str[i] == '/')
  83                         return err;
  84         return 0;
  85 }
  86
  87 /*
  88  * START OF "GENERIC" DECODE ROUTINES.
  89  *   These may look a little ugly since they are imported from a "generic"
  90  * set of XDR encode/decode routines which are intended to be shared by
  91  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  92  *
  93  * If the pain of reading these is too great, it should be a straightforward
  94  * task to translate them into Linux-specific versions which are more
  95  * consistent with the style used in NFSv2/v3...
  96  */
  97 #define DECODE_HEAD                             \
  98         __be32 *p;                              \
  99         __be32 status
 100 #define DECODE_TAIL                             \
 101         status = 0;                             \
 102 out:                                            \
 103         return status;                          \
 104 xdr_error:                                      \
 105         dprintk("NFSD: xdr error (%s:%d)\n",    \
 106                         __FILE__, __LINE__);    \
 107         status = nfserr_bad_xdr;                \
 108         goto out
 109
 110 #define READ32(x)         (x) = ntohl(*p++)
 111 #define READ64(x)         do {                  \
 112         (x) = (u64)ntohl(*p++) << 32;           \
 113         (x) |= ntohl(*p++);                     \
 114 } while (0)
 115 #define READTIME(x)       do {                  \
 116         p++;                                    \
 117         (x) = ntohl(*p++);                      \
 118         p++;                                    \
 119 } while (0)
 120 #define READMEM(x,nbytes) do {                  \
 121         x = (char *)p;                          \
 122         p += XDR_QUADLEN(nbytes);               \
 123 } while (0)
 124 #define SAVEMEM(x,nbytes) do {                  \
 125         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 126                 savemem(argp, p, nbytes) :      \
 127                 (char *)p)) {                   \
 128                 dprintk("NFSD: xdr error (%s:%d)\n", \
 129                                 __FILE__, __LINE__); \
 130                 goto xdr_error;                 \
 131                 }                               \
 132         p += XDR_QUADLEN(nbytes);               \
 133 } while (0)
 134 #define COPYMEM(x,nbytes) do {                  \
 135         memcpy((x), p, nbytes);                 \
 136         p += XDR_QUADLEN(nbytes);               \
 137 } while (0)
 138
 139 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 140 #define READ_BUF(nbytes)  do {                  \
 141         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 142                 p = argp->p;                    \
 143                 argp->p += XDR_QUADLEN(nbytes); \
 144         } else if (!(p = read_buf(argp, nbytes))) { \
 145                 dprintk("NFSD: xdr error (%s:%d)\n", \
 146                                 __FILE__, __LINE__); \
 147                 goto xdr_error;                 \
 148         }                                       \
 149 } while (0)
 150
 151 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 152 {
 153         /* We want more bytes than seem to be available.
 154          * Maybe we need a new page, maybe we have just run out
 155          */
 156         unsigned int avail = (char *)argp->end - (char *)argp->p;
 157         __be32 *p;
 158         if (avail + argp->pagelen < nbytes)
 159                 return NULL;
 160         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 161                 return NULL;
 162         /* ok, we can do it with the current plus the next page */
 163         if (nbytes <= sizeof(argp->tmp))
 164                 p = argp->tmp;
 165         else {
 166                 kfree(argp->tmpp);
 167                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 168                 if (!p)
 169                         return NULL;
 170
 171         }
 172         /*
 173          * The following memcpy is safe because read_buf is always
 174          * called with nbytes > avail, and the two cases above both
 175          * guarantee p points to at least nbytes bytes.
 176          */
 177         memcpy(p, argp->p, avail);
 178         /* step to next page */
 179         argp->p = page_address(argp->pagelist[0]);
 180         argp->pagelist++;
 181         if (argp->pagelen < PAGE_SIZE) {
 182                 argp->end = p + (argp->pagelen>>2);
 183                 argp->pagelen = 0;
 184         } else {
 185                 argp->end = p + (PAGE_SIZE>>2);
 186                 argp->pagelen -= PAGE_SIZE;
 187         }
 188         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 189         argp->p += XDR_QUADLEN(nbytes - avail);
 190         return p;
 191 }
 192
 193 static int
 194 defer_free(struct nfsd4_compoundargs *argp,
 195                 void (*release)(const void *), void *p)
 196 {
 197         struct tmpbuf *tb;
 198
 199         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 200         if (!tb)
 201                 return -ENOMEM;
 202         tb->buf = p;
 203         tb->release = release;
 204         tb->next = argp->to_free;
 205         argp->to_free = tb;
 206         return 0;
 207 }
 208
 209 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 210 {
 211         if (p == argp->tmp) {
 212                 p = kmalloc(nbytes, GFP_KERNEL);
 213                 if (!p)
 214                         return NULL;
 215                 memcpy(p, argp->tmp, nbytes);
 216         } else {
 217                 BUG_ON(p != argp->tmpp);
 218                 argp->tmpp = NULL;
 219         }
 220         if (defer_free(argp, kfree, p)) {
 221                 kfree(p);
 222                 return NULL;
 223         } else
 224                 return (char *)p;
 225 }
 226
 227 static __be32
 228 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 229 {
 230         u32 bmlen;
 231         DECODE_HEAD;
 232
 233         bmval[0] = 0;
 234         bmval[1] = 0;
 235
 236         READ_BUF(4);
 237         READ32(bmlen);
 238         if (bmlen > 1000)
 239                 goto xdr_error;
 240
 241         READ_BUF(bmlen << 2);
 242         if (bmlen > 0)
 243                 READ32(bmval[0]);
 244         if (bmlen > 1)
 245                 READ32(bmval[1]);
 246
 247         DECODE_TAIL;
 248 }
 249
 250 static __be32
 251 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 252     struct nfs4_acl **acl)
 253 {
 254         int expected_len, len = 0;
 255         u32 dummy32;
 256         char *buf;
 257         int host_err;
 258
 259         DECODE_HEAD;
 260         iattr->ia_valid = 0;
 261         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 262                 return status;
 263
 264         /*
 265          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
 266          * read-only attributes return ERR_INVAL.
 267          */
 268         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 269                 return nfserr_attrnotsupp;
 270         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 271                 return nfserr_inval;
 272
 273         READ_BUF(4);
 274         READ32(expected_len);
 275
 276         if (bmval[0] & FATTR4_WORD0_SIZE) {
 277                 READ_BUF(8);
 278                 len += 8;
 279                 READ64(iattr->ia_size);
 280                 iattr->ia_valid |= ATTR_SIZE;
 281         }
 282         if (bmval[0] & FATTR4_WORD0_ACL) {
 283                 int nace;
 284                 struct nfs4_ace *ace;
 285
 286                 READ_BUF(4); len += 4;
 287                 READ32(nace);
 288
 289                 if (nace > NFS4_ACL_MAX)
 290                         return nfserr_resource;
 291
 292                 *acl = nfs4_acl_new(nace);
 293                 if (*acl == NULL) {
 294                         host_err = -ENOMEM;
 295                         goto out_nfserr;
 296                 }
 297                 defer_free(argp, kfree, *acl);
 298
 299                 (*acl)->naces = nace;
 300                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 301                         READ_BUF(16); len += 16;
 302                         READ32(ace->type);
 303                         READ32(ace->flag);
 304                         READ32(ace->access_mask);
 305                         READ32(dummy32);
 306                         READ_BUF(dummy32);
 307                         len += XDR_QUADLEN(dummy32) << 2;
 308                         READMEM(buf, dummy32);
 309                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 310                         host_err = 0;
 311                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 312                                 ace->who = 0;
 313                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 314                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 315                                                 buf, dummy32, &ace->who);
 316                         else
 317                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 318                                                 buf, dummy32, &ace->who);
 319                         if (host_err)
 320                                 goto out_nfserr;
 321                 }
 322         } else
 323                 *acl = NULL;
 324         if (bmval[1] & FATTR4_WORD1_MODE) {
 325                 READ_BUF(4);
 326                 len += 4;
 327                 READ32(iattr->ia_mode);
 328                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 329                 iattr->ia_valid |= ATTR_MODE;
 330         }
 331         if (bmval[1] & FATTR4_WORD1_OWNER) {
 332                 READ_BUF(4);
 333                 len += 4;
 334                 READ32(dummy32);
 335                 READ_BUF(dummy32);
 336                 len += (XDR_QUADLEN(dummy32) << 2);
 337                 READMEM(buf, dummy32);
 338                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 339                         goto out_nfserr;
 340                 iattr->ia_valid |= ATTR_UID;
 341         }
 342         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 343                 READ_BUF(4);
 344                 len += 4;
 345                 READ32(dummy32);
 346                 READ_BUF(dummy32);
 347                 len += (XDR_QUADLEN(dummy32) << 2);
 348                 READMEM(buf, dummy32);
 349                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 350                         goto out_nfserr;
 351                 iattr->ia_valid |= ATTR_GID;
 352         }
 353         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 354                 READ_BUF(4);
 355                 len += 4;
 356                 READ32(dummy32);
 357                 switch (dummy32) {
 358                 case NFS4_SET_TO_CLIENT_TIME:
 359                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 360                            all 32 bits of 'nseconds'. */
 361                         READ_BUF(12);
 362                         len += 12;
 363                         READ32(dummy32);
 364                         if (dummy32)
 365                                 return nfserr_inval;
 366                         READ32(iattr->ia_atime.tv_sec);
 367                         READ32(iattr->ia_atime.tv_nsec);
 368                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 369                                 return nfserr_inval;
 370                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 371                         break;
 372                 case NFS4_SET_TO_SERVER_TIME:
 373                         iattr->ia_valid |= ATTR_ATIME;
 374                         break;
 375                 default:
 376                         goto xdr_error;
 377                 }
 378         }
 379         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 380                 READ_BUF(4);
 381                 len += 4;
 382                 READ32(dummy32);
 383                 switch (dummy32) {
 384                 case NFS4_SET_TO_CLIENT_TIME:
 385                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 386                            all 32 bits of 'nseconds'. */
 387                         READ_BUF(12);
 388                         len += 12;
 389                         READ32(dummy32);
 390                         if (dummy32)
 391                                 return nfserr_inval;
 392                         READ32(iattr->ia_mtime.tv_sec);
 393                         READ32(iattr->ia_mtime.tv_nsec);
 394                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 395                                 return nfserr_inval;
 396                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 397                         break;
 398                 case NFS4_SET_TO_SERVER_TIME:
 399                         iattr->ia_valid |= ATTR_MTIME;
 400                         break;
 401                 default:
 402                         goto xdr_error;
 403                 }
 404         }
 405         if (len != expected_len)
 406                 goto xdr_error;
 407
 408         DECODE_TAIL;
 409
 410 out_nfserr:
 411         status = nfserrno(host_err);
 412         goto out;
 413 }
 414
 415 static __be32
 416 nfsd4_decode_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 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
 995
 996 static nfsd4_dec nfsd4_dec_ops[] = {
 997         [OP_ACCESS]             (nfsd4_dec)nfsd4_decode_access,
 998         [OP_CLOSE]              (nfsd4_dec)nfsd4_decode_close,
 999         [OP_COMMIT]             (nfsd4_dec)nfsd4_decode_commit,
1000         [OP_CREATE]             (nfsd4_dec)nfsd4_decode_create,
1001         [OP_DELEGRETURN]        (nfsd4_dec)nfsd4_decode_delegreturn,
1002         [OP_GETATTR]            (nfsd4_dec)nfsd4_decode_getattr,
1003         [OP_GETFH]              (nfsd4_dec)nfsd4_decode_noop,
1004         [OP_LINK]               (nfsd4_dec)nfsd4_decode_link,
1005         [OP_LOCK]               (nfsd4_dec)nfsd4_decode_lock,
1006         [OP_LOCKT]              (nfsd4_dec)nfsd4_decode_lockt,
1007         [OP_LOCKU]              (nfsd4_dec)nfsd4_decode_locku,
1008         [OP_LOOKUP]             (nfsd4_dec)nfsd4_decode_lookup,
1009         [OP_LOOKUPP]            (nfsd4_dec)nfsd4_decode_noop,
1010         [OP_NVERIFY]            (nfsd4_dec)nfsd4_decode_verify,
1011         [OP_OPEN]               (nfsd4_dec)nfsd4_decode_open,
1012         [OP_OPEN_CONFIRM]       (nfsd4_dec)nfsd4_decode_open_confirm,
1013         [OP_OPEN_DOWNGRADE]     (nfsd4_dec)nfsd4_decode_open_downgrade,
1014         [OP_PUTFH]              (nfsd4_dec)nfsd4_decode_putfh,
1015         [OP_PUTROOTFH]          (nfsd4_dec)nfsd4_decode_noop,
1016         [OP_READ]               (nfsd4_dec)nfsd4_decode_read,
1017         [OP_READDIR]            (nfsd4_dec)nfsd4_decode_readdir,
1018         [OP_READLINK]           (nfsd4_dec)nfsd4_decode_noop,
1019         [OP_REMOVE]             (nfsd4_dec)nfsd4_decode_remove,
1020         [OP_RENAME]             (nfsd4_dec)nfsd4_decode_rename,
1021         [OP_RENEW]              (nfsd4_dec)nfsd4_decode_renew,
1022         [OP_RESTOREFH]          (nfsd4_dec)nfsd4_decode_noop,
1023         [OP_SAVEFH]             (nfsd4_dec)nfsd4_decode_noop,
1024         [OP_SECINFO]            (nfsd4_dec)nfsd4_decode_secinfo,
1025         [OP_SETATTR]            (nfsd4_dec)nfsd4_decode_setattr,
1026         [OP_SETCLIENTID]        (nfsd4_dec)nfsd4_decode_setclientid,
1027         [OP_SETCLIENTID_CONFIRM](nfsd4_dec)nfsd4_decode_setclientid_confirm,
1028         [OP_VERIFY]             (nfsd4_dec)nfsd4_decode_verify,
1029         [OP_WRITE]              (nfsd4_dec)nfsd4_decode_write,
1030         [OP_RELEASE_LOCKOWNER]  (nfsd4_dec)nfsd4_decode_release_lockowner,
1031 };
1032
1033 static __be32
1034 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1035 {
1036         DECODE_HEAD;
1037         struct nfsd4_op *op;
1038         int i;
1039
1040         /*
1041          * XXX: According to spec, we should check the tag
1042          * for UTF-8 compliance.  I'm postponing this for
1043          * now because it seems that some clients do use
1044          * binary tags.
1045          */
1046         READ_BUF(4);
1047         READ32(argp->taglen);
1048         READ_BUF(argp->taglen + 8);
1049         SAVEMEM(argp->tag, argp->taglen);
1050         READ32(argp->minorversion);
1051         READ32(argp->opcnt);
1052
1053         if (argp->taglen > NFSD4_MAX_TAGLEN)
1054                 goto xdr_error;
1055         if (argp->opcnt > 100)
1056                 goto xdr_error;
1057
1058         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1059                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1060                 if (!argp->ops) {
1061                         argp->ops = argp->iops;
1062                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1063                         goto xdr_error;
1064                 }
1065         }
1066
1067         if (argp->minorversion != 0)
1068                 argp->opcnt = 0;
1069
1070         for (i = 0; i < argp->opcnt; i++) {
1071                 op = &argp->ops[i];
1072                 op->replay = NULL;
1073
1074                 /*
1075                  * We can't use READ_BUF() here because we need to handle
1076                  * a missing opcode as an OP_WRITE + 1. So we need to check
1077                  * to see if we're truly at the end of our buffer or if there
1078                  * is another page we need to flip to.
1079                  */
1080
1081                 if (argp->p == argp->end) {
1082                         if (argp->pagelen < 4) {
1083                                 /* There isn't an opcode still on the wire */
1084                                 op->opnum = OP_WRITE + 1;
1085                                 op->status = nfserr_bad_xdr;
1086                                 argp->opcnt = i+1;
1087                                 break;
1088                         }
1089
1090                         /*
1091                          * False alarm. We just hit a page boundary, but there
1092                          * is still data available.  Move pointer across page
1093                          * boundary.  *snip from READ_BUF*
1094                          */
1095                         argp->p = page_address(argp->pagelist[0]);
1096                         argp->pagelist++;
1097                         if (argp->pagelen < PAGE_SIZE) {
1098                                 argp->end = p + (argp->pagelen>>2);
1099                                 argp->pagelen = 0;
1100                         } else {
1101                                 argp->end = p + (PAGE_SIZE>>2);
1102                                 argp->pagelen -= PAGE_SIZE;
1103                         }
1104                 }
1105                 op->opnum = ntohl(*argp->p++);
1106
1107                 if (op->opnum >= OP_ACCESS && op->opnum < ARRAY_SIZE(nfsd4_dec_ops))
1108                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1109                 else {
1110                         op->opnum = OP_ILLEGAL;
1111                         op->status = nfserr_op_illegal;
1112                 }
1113
1114                 if (op->status) {
1115                         argp->opcnt = i+1;
1116                         break;
1117                 }
1118         }
1119
1120         DECODE_TAIL;
1121 }
1122 /*
1123  * END OF "GENERIC" DECODE ROUTINES.
1124  */
1125
1126 /*
1127  * START OF "GENERIC" ENCODE ROUTINES.
1128  *   These may look a little ugly since they are imported from a "generic"
1129  * set of XDR encode/decode routines which are intended to be shared by
1130  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1131  *
1132  * If the pain of reading these is too great, it should be a straightforward
1133  * task to translate them into Linux-specific versions which are more
1134  * consistent with the style used in NFSv2/v3...
1135  */
1136 #define ENCODE_HEAD              __be32 *p
1137
1138 #define WRITE32(n)               *p++ = htonl(n)
1139 #define WRITE64(n)               do {                           \
1140         *p++ = htonl((u32)((n) >> 32));                         \
1141         *p++ = htonl((u32)(n));                                 \
1142 } while (0)
1143 #define WRITEMEM(ptr,nbytes)     do if (nbytes > 0) {           \
1144         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1145         memcpy(p, ptr, nbytes);                                 \
1146         p += XDR_QUADLEN(nbytes);                               \
1147 } while (0)
1148 #define WRITECINFO(c)           do {                            \
1149         *p++ = htonl(c.atomic);                                 \
1150         *p++ = htonl(c.before_ctime_sec);                               \
1151         *p++ = htonl(c.before_ctime_nsec);                              \
1152         *p++ = htonl(c.after_ctime_sec);                                \
1153         *p++ = htonl(c.after_ctime_nsec);                               \
1154 } while (0)
1155
1156 #define RESERVE_SPACE(nbytes)   do {                            \
1157         p = resp->p;                                            \
1158         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1159 } while (0)
1160 #define ADJUST_ARGS()           resp->p = p
1161
1162 /*
1163  * Header routine to setup seqid operation replay cache
1164  */
1165 #define ENCODE_SEQID_OP_HEAD                                    \
1166         __be32 *p;                                              \
1167         __be32 *save;                                           \
1168                                                                 \
1169         save = resp->p;
1170
1171 /*
1172  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1173  * is where sequence id's are incremented, and the replay cache is filled.
1174  * Note that we increment sequence id's here, at the last moment, so we're sure
1175  * we know whether the error to be returned is a sequence id mutating error.
1176  */
1177
1178 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1179         if (seqid_mutating_err(nfserr) && stateowner) {         \
1180                 stateowner->so_seqid++;                         \
1181                 stateowner->so_replay.rp_status = nfserr;       \
1182                 stateowner->so_replay.rp_buflen =               \
1183                           (((char *)(resp)->p - (char *)save)); \
1184                 memcpy(stateowner->so_replay.rp_buf, save,      \
1185                         stateowner->so_replay.rp_buflen);       \
1186         } } while (0);
1187
1188 /* Encode as an array of strings the string given with components
1189  * seperated @sep.
1190  */
1191 static __be32 nfsd4_encode_components(char sep, char *components,
1192                                    __be32 **pp, int *buflen)
1193 {
1194         __be32 *p = *pp;
1195         __be32 *countp = p;
1196         int strlen, count=0;
1197         char *str, *end;
1198
1199         dprintk("nfsd4_encode_components(%s)\n", components);
1200         if ((*buflen -= 4) < 0)
1201                 return nfserr_resource;
1202         WRITE32(0); /* We will fill this in with @count later */
1203         end = str = components;
1204         while (*end) {
1205                 for (; *end && (*end != sep); end++)
1206                         ; /* Point to end of component */
1207                 strlen = end - str;
1208                 if (strlen) {
1209                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1210                                 return nfserr_resource;
1211                         WRITE32(strlen);
1212                         WRITEMEM(str, strlen);
1213                         count++;
1214                 }
1215                 else
1216                         end++;
1217                 str = end;
1218         }
1219         *pp = p;
1220         p = countp;
1221         WRITE32(count);
1222         return 0;
1223 }
1224
1225 /*
1226  * encode a location element of a fs_locations structure
1227  */
1228 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1229                                     __be32 **pp, int *buflen)
1230 {
1231         __be32 status;
1232         __be32 *p = *pp;
1233
1234         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1235         if (status)
1236                 return status;
1237         status = nfsd4_encode_components('/', location->path, &p, buflen);
1238         if (status)
1239                 return status;
1240         *pp = p;
1241         return 0;
1242 }
1243
1244 /*
1245  * Return the path to an export point in the pseudo filesystem namespace
1246  * Returned string is safe to use as long as the caller holds a reference
1247  * to @exp.
1248  */
1249 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1250 {
1251         struct svc_fh tmp_fh;
1252         char *path, *rootpath;
1253
1254         fh_init(&tmp_fh, NFS4_FHSIZE);
1255         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1256         if (*stat)
1257                 return NULL;
1258         rootpath = tmp_fh.fh_export->ex_pathname;
1259
1260         path = exp->ex_pathname;
1261
1262         if (strncmp(path, rootpath, strlen(rootpath))) {
1263                 dprintk("nfsd: fs_locations failed;"
1264                         "%s is not contained in %s\n", path, rootpath);
1265                 *stat = nfserr_notsupp;
1266                 return NULL;
1267         }
1268
1269         return path + strlen(rootpath);
1270 }
1271
1272 /*
1273  *  encode a fs_locations structure
1274  */
1275 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1276                                      struct svc_export *exp,
1277                                      __be32 **pp, int *buflen)
1278 {
1279         __be32 status;
1280         int i;
1281         __be32 *p = *pp;
1282         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1283         char *root = nfsd4_path(rqstp, exp, &status);
1284
1285         if (status)
1286                 return status;
1287         status = nfsd4_encode_components('/', root, &p, buflen);
1288         if (status)
1289                 return status;
1290         if ((*buflen -= 4) < 0)
1291                 return nfserr_resource;
1292         WRITE32(fslocs->locations_count);
1293         for (i=0; i<fslocs->locations_count; i++) {
1294                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1295                                                    &p, buflen);
1296                 if (status)
1297                         return status;
1298         }
1299         *pp = p;
1300         return 0;
1301 }
1302
1303 static u32 nfs4_ftypes[16] = {
1304         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1305         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1306         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1307         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1308 };
1309
1310 static __be32
1311 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1312                         __be32 **p, int *buflen)
1313 {
1314         int status;
1315
1316         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1317                 return nfserr_resource;
1318         if (whotype != NFS4_ACL_WHO_NAMED)
1319                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1320         else if (group)
1321                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1322         else
1323                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1324         if (status < 0)
1325                 return nfserrno(status);
1326         *p = xdr_encode_opaque(*p, NULL, status);
1327         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1328         BUG_ON(*buflen < 0);
1329         return 0;
1330 }
1331
1332 static inline __be32
1333 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1334 {
1335         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1336 }
1337
1338 static inline __be32
1339 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1340 {
1341         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1342 }
1343
1344 static inline __be32
1345 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1346                 __be32 **p, int *buflen)
1347 {
1348         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1349 }
1350
1351 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1352                               FATTR4_WORD0_RDATTR_ERROR)
1353 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1354
1355 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1356 {
1357         /* As per referral draft:  */
1358         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1359             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1360                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1361                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1362                         *rdattr_err = NFSERR_MOVED;
1363                 else
1364                         return nfserr_moved;
1365         }
1366         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1367         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1368         return 0;
1369 }
1370
1371 /*
1372  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1373  * ourselves.
1374  *
1375  * @countp is the buffer size in _words_; upon successful return this becomes
1376  * replaced with the number of words written.
1377  */
1378 __be32
1379 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1380                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1381                 struct svc_rqst *rqstp, int ignore_crossmnt)
1382 {
1383         u32 bmval0 = bmval[0];
1384         u32 bmval1 = bmval[1];
1385         struct kstat stat;
1386         struct svc_fh tempfh;
1387         struct kstatfs statfs;
1388         int buflen = *countp << 2;
1389         __be32 *attrlenp;
1390         u32 dummy;
1391         u64 dummy64;
1392         u32 rdattr_err = 0;
1393         __be32 *p = buffer;
1394         __be32 status;
1395         int err;
1396         int aclsupport = 0;
1397         struct nfs4_acl *acl = NULL;
1398
1399         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1400         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1401         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1402
1403         if (exp->ex_fslocs.migrated) {
1404                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1405                 if (status)
1406                         goto out;
1407         }
1408
1409         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1410         if (err)
1411                 goto out_nfserr;
1412         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1413                         FATTR4_WORD0_MAXNAME)) ||
1414             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1415                        FATTR4_WORD1_SPACE_TOTAL))) {
1416                 err = vfs_statfs(dentry, &statfs);
1417                 if (err)
1418                         goto out_nfserr;
1419         }
1420         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1421                 fh_init(&tempfh, NFS4_FHSIZE);
1422                 status = fh_compose(&tempfh, exp, dentry, NULL);
1423                 if (status)
1424                         goto out;
1425                 fhp = &tempfh;
1426         }
1427         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1428                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1429                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1430                 aclsupport = (err == 0);
1431                 if (bmval0 & FATTR4_WORD0_ACL) {
1432                         if (err == -EOPNOTSUPP)
1433                                 bmval0 &= ~FATTR4_WORD0_ACL;
1434                         else if (err == -EINVAL) {
1435                                 status = nfserr_attrnotsupp;
1436                                 goto out;
1437                         } else if (err != 0)
1438                                 goto out_nfserr;
1439                 }
1440         }
1441         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1442                 if (exp->ex_fslocs.locations == NULL) {
1443                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1444                 }
1445         }
1446         if ((buflen -= 16) < 0)
1447                 goto out_resource;
1448
1449         WRITE32(2);
1450         WRITE32(bmval0);
1451         WRITE32(bmval1);
1452         attrlenp = p++;                /* to be backfilled later */
1453
1454         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1455                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1456                 if ((buflen -= 12) < 0)
1457                         goto out_resource;
1458                 if (!aclsupport)
1459                         word0 &= ~FATTR4_WORD0_ACL;
1460                 if (!exp->ex_fslocs.locations)
1461                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1462                 WRITE32(2);
1463                 WRITE32(word0);
1464                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1465         }
1466         if (bmval0 & FATTR4_WORD0_TYPE) {
1467                 if ((buflen -= 4) < 0)
1468                         goto out_resource;
1469                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1470                 if (dummy == NF4BAD)
1471                         goto out_serverfault;
1472                 WRITE32(dummy);
1473         }
1474         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1475                 if ((buflen -= 4) < 0)
1476                         goto out_resource;
1477                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1478                         WRITE32(NFS4_FH_PERSISTENT);
1479                 else
1480                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1481         }
1482         if (bmval0 & FATTR4_WORD0_CHANGE) {
1483                 /*
1484                  * Note: This _must_ be consistent with the scheme for writing
1485                  * change_info, so any changes made here must be reflected there
1486                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1487                  * macro above.)
1488                  */
1489                 if ((buflen -= 8) < 0)
1490                         goto out_resource;
1491                 WRITE32(stat.ctime.tv_sec);
1492                 WRITE32(stat.ctime.tv_nsec);
1493         }
1494         if (bmval0 & FATTR4_WORD0_SIZE) {
1495                 if ((buflen -= 8) < 0)
1496                         goto out_resource;
1497                 WRITE64(stat.size);
1498         }
1499         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1500                 if ((buflen -= 4) < 0)
1501                         goto out_resource;
1502                 WRITE32(1);
1503         }
1504         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1505                 if ((buflen -= 4) < 0)
1506                         goto out_resource;
1507                 WRITE32(1);
1508         }
1509         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1510                 if ((buflen -= 4) < 0)
1511                         goto out_resource;
1512                 WRITE32(0);
1513         }
1514         if (bmval0 & FATTR4_WORD0_FSID) {
1515                 if ((buflen -= 16) < 0)
1516                         goto out_resource;
1517                 if (exp->ex_fslocs.migrated) {
1518                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1519                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1520                 } else switch(fsid_source(fhp)) {
1521                 case FSIDSOURCE_FSID:
1522                         WRITE64((u64)exp->ex_fsid);
1523                         WRITE64((u64)0);
1524                         break;
1525                 case FSIDSOURCE_DEV:
1526                         WRITE32(0);
1527                         WRITE32(MAJOR(stat.dev));
1528                         WRITE32(0);
1529                         WRITE32(MINOR(stat.dev));
1530                         break;
1531                 case FSIDSOURCE_UUID:
1532                         WRITEMEM(exp->ex_uuid, 16);
1533                         break;
1534                 }
1535         }
1536         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1537                 if ((buflen -= 4) < 0)
1538                         goto out_resource;
1539                 WRITE32(0);
1540         }
1541         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1542                 if ((buflen -= 4) < 0)
1543                         goto out_resource;
1544                 WRITE32(NFSD_LEASE_TIME);
1545         }
1546         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1547                 if ((buflen -= 4) < 0)
1548                         goto out_resource;
1549                 WRITE32(rdattr_err);
1550         }
1551         if (bmval0 & FATTR4_WORD0_ACL) {
1552                 struct nfs4_ace *ace;
1553
1554                 if (acl == NULL) {
1555                         if ((buflen -= 4) < 0)
1556                                 goto out_resource;
1557
1558                         WRITE32(0);
1559                         goto out_acl;
1560                 }
1561                 if ((buflen -= 4) < 0)
1562                         goto out_resource;
1563                 WRITE32(acl->naces);
1564
1565                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1566                         if ((buflen -= 4*3) < 0)
1567                                 goto out_resource;
1568                         WRITE32(ace->type);
1569                         WRITE32(ace->flag);
1570                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1571                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1572                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1573                                 &p, &buflen);
1574                         if (status == nfserr_resource)
1575                                 goto out_resource;
1576                         if (status)
1577                                 goto out;
1578                 }
1579         }
1580 out_acl:
1581         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1582                 if ((buflen -= 4) < 0)
1583                         goto out_resource;
1584                 WRITE32(aclsupport ?
1585                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1586         }
1587         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1588                 if ((buflen -= 4) < 0)
1589                         goto out_resource;
1590                 WRITE32(1);
1591         }
1592         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1593                 if ((buflen -= 4) < 0)
1594                         goto out_resource;
1595                 WRITE32(1);
1596         }
1597         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1598                 if ((buflen -= 4) < 0)
1599                         goto out_resource;
1600                 WRITE32(1);
1601         }
1602         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1603                 if ((buflen -= 4) < 0)
1604                         goto out_resource;
1605                 WRITE32(1);
1606         }
1607         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1608                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1609                 if (buflen < 0)
1610                         goto out_resource;
1611                 WRITE32(fhp->fh_handle.fh_size);
1612                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1613         }
1614         if (bmval0 & FATTR4_WORD0_FILEID) {
1615                 if ((buflen -= 8) < 0)
1616                         goto out_resource;
1617                 WRITE64(stat.ino);
1618         }
1619         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1620                 if ((buflen -= 8) < 0)
1621                         goto out_resource;
1622                 WRITE64((u64) statfs.f_ffree);
1623         }
1624         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1625                 if ((buflen -= 8) < 0)
1626                         goto out_resource;
1627                 WRITE64((u64) statfs.f_ffree);
1628         }
1629         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1630                 if ((buflen -= 8) < 0)
1631                         goto out_resource;
1632                 WRITE64((u64) statfs.f_files);
1633         }
1634         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1635                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1636                 if (status == nfserr_resource)
1637                         goto out_resource;
1638                 if (status)
1639                         goto out;
1640         }
1641         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1642                 if ((buflen -= 4) < 0)
1643                         goto out_resource;
1644                 WRITE32(1);
1645         }
1646         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1647                 if ((buflen -= 8) < 0)
1648                         goto out_resource;
1649                 WRITE64(~(u64)0);
1650         }
1651         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1652                 if ((buflen -= 4) < 0)
1653                         goto out_resource;
1654                 WRITE32(255);
1655         }
1656         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1657                 if ((buflen -= 4) < 0)
1658                         goto out_resource;
1659                 WRITE32(statfs.f_namelen);
1660         }
1661         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1662                 if ((buflen -= 8) < 0)
1663                         goto out_resource;
1664                 WRITE64((u64) svc_max_payload(rqstp));
1665         }
1666         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1667                 if ((buflen -= 8) < 0)
1668                         goto out_resource;
1669                 WRITE64((u64) svc_max_payload(rqstp));
1670         }
1671         if (bmval1 & FATTR4_WORD1_MODE) {
1672                 if ((buflen -= 4) < 0)
1673                         goto out_resource;
1674                 WRITE32(stat.mode & S_IALLUGO);
1675         }
1676         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1677                 if ((buflen -= 4) < 0)
1678                         goto out_resource;
1679                 WRITE32(1);
1680         }
1681         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1682                 if ((buflen -= 4) < 0)
1683                         goto out_resource;
1684                 WRITE32(stat.nlink);
1685         }
1686         if (bmval1 & FATTR4_WORD1_OWNER) {
1687                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1688                 if (status == nfserr_resource)
1689                         goto out_resource;
1690                 if (status)
1691                         goto out;
1692         }
1693         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1694                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1695                 if (status == nfserr_resource)
1696                         goto out_resource;
1697                 if (status)
1698                         goto out;
1699         }
1700         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1701                 if ((buflen -= 8) < 0)
1702                         goto out_resource;
1703                 WRITE32((u32) MAJOR(stat.rdev));
1704                 WRITE32((u32) MINOR(stat.rdev));
1705         }
1706         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1707                 if ((buflen -= 8) < 0)
1708                         goto out_resource;
1709                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1710                 WRITE64(dummy64);
1711         }
1712         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1713                 if ((buflen -= 8) < 0)
1714                         goto out_resource;
1715                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1716                 WRITE64(dummy64);
1717         }
1718         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1719                 if ((buflen -= 8) < 0)
1720                         goto out_resource;
1721                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1722                 WRITE64(dummy64);
1723         }
1724         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1725                 if ((buflen -= 8) < 0)
1726                         goto out_resource;
1727                 dummy64 = (u64)stat.blocks << 9;
1728                 WRITE64(dummy64);
1729         }
1730         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1731                 if ((buflen -= 12) < 0)
1732                         goto out_resource;
1733                 WRITE32(0);
1734                 WRITE32(stat.atime.tv_sec);
1735                 WRITE32(stat.atime.tv_nsec);
1736         }
1737         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1738                 if ((buflen -= 12) < 0)
1739                         goto out_resource;
1740                 WRITE32(0);
1741                 WRITE32(1);
1742                 WRITE32(0);
1743         }
1744         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1745                 if ((buflen -= 12) < 0)
1746                         goto out_resource;
1747                 WRITE32(0);
1748                 WRITE32(stat.ctime.tv_sec);
1749                 WRITE32(stat.ctime.tv_nsec);
1750         }
1751         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1752                 if ((buflen -= 12) < 0)
1753                         goto out_resource;
1754                 WRITE32(0);
1755                 WRITE32(stat.mtime.tv_sec);
1756                 WRITE32(stat.mtime.tv_nsec);
1757         }
1758         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1759                 if ((buflen -= 8) < 0)
1760                         goto out_resource;
1761                 /*
1762                  * Get parent's attributes if not ignoring crossmount
1763                  * and this is the root of a cross-mounted filesystem.
1764                  */
1765                 if (ignore_crossmnt == 0 &&
1766                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
1767                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
1768                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
1769                         if (err)
1770                                 goto out_nfserr;
1771                 }
1772                 WRITE64(stat.ino);
1773         }
1774         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1775         *countp = p - buffer;
1776         status = nfs_ok;
1777
1778 out:
1779         kfree(acl);
1780         if (fhp == &tempfh)
1781                 fh_put(&tempfh);
1782         return status;
1783 out_nfserr:
1784         status = nfserrno(err);
1785         goto out;
1786 out_resource:
1787         *countp = 0;
1788         status = nfserr_resource;
1789         goto out;
1790 out_serverfault:
1791         status = nfserr_serverfault;
1792         goto out;
1793 }
1794
1795 static inline int attributes_need_mount(u32 *bmval)
1796 {
1797         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
1798                 return 1;
1799         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
1800                 return 1;
1801         return 0;
1802 }
1803
1804 static __be32
1805 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1806                 const char *name, int namlen, __be32 *p, int *buflen)
1807 {
1808         struct svc_export *exp = cd->rd_fhp->fh_export;
1809         struct dentry *dentry;
1810         __be32 nfserr;
1811         int ignore_crossmnt = 0;
1812
1813         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1814         if (IS_ERR(dentry))
1815                 return nfserrno(PTR_ERR(dentry));
1816
1817         exp_get(exp);
1818         /*
1819          * In the case of a mountpoint, the client may be asking for
1820          * attributes that are only properties of the underlying filesystem
1821          * as opposed to the cross-mounted file system. In such a case,
1822          * we will not follow the cross mount and will fill the attribtutes
1823          * directly from the mountpoint dentry.
1824          */
1825         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
1826                 ignore_crossmnt = 1;
1827         else if (d_mountpoint(dentry)) {
1828                 int err;
1829
1830                 /*
1831                  * Why the heck aren't we just using nfsd_lookup??
1832                  * Different "."/".." handling?  Something else?
1833                  * At least, add a comment here to explain....
1834                  */
1835                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1836                 if (err) {
1837                         nfserr = nfserrno(err);
1838                         goto out_put;
1839                 }
1840                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
1841                 if (nfserr)
1842                         goto out_put;
1843
1844         }
1845         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1846                                         cd->rd_rqstp, ignore_crossmnt);
1847 out_put:
1848         dput(dentry);
1849         exp_put(exp);
1850         return nfserr;
1851 }
1852
1853 static __be32 *
1854 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1855 {
1856         __be32 *attrlenp;
1857
1858         if (buflen < 6)
1859                 return NULL;
1860         *p++ = htonl(2);
1861         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1862         *p++ = htonl(0);                         /* bmval1 */
1863
1864         attrlenp = p++;
1865         *p++ = nfserr;       /* no htonl */
1866         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1867         return p;
1868 }
1869
1870 static int
1871 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1872                     loff_t offset, u64 ino, unsigned int d_type)
1873 {
1874         struct readdir_cd *ccd = ccdv;
1875         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1876         int buflen;
1877         __be32 *p = cd->buffer;
1878         __be32 nfserr = nfserr_toosmall;
1879
1880         /* In nfsv4, "." and ".." never make it onto the wire.. */
1881         if (name && isdotent(name, namlen)) {
1882                 cd->common.err = nfs_ok;
1883                 return 0;
1884         }
1885
1886         if (cd->offset)
1887                 xdr_encode_hyper(cd->offset, (u64) offset);
1888
1889         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1890         if (buflen < 0)
1891                 goto fail;
1892
1893         *p++ = xdr_one;                             /* mark entry present */
1894         cd->offset = p;                             /* remember pointer */
1895         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1896         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1897
1898         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1899         switch (nfserr) {
1900         case nfs_ok:
1901                 p += buflen;
1902                 break;
1903         case nfserr_resource:
1904                 nfserr = nfserr_toosmall;
1905                 goto fail;
1906         case nfserr_dropit:
1907                 goto fail;
1908         default:
1909                 /*
1910                  * If the client requested the RDATTR_ERROR attribute,
1911                  * we stuff the error code into this attribute
1912                  * and continue.  If this attribute was not requested,
1913                  * then in accordance with the spec, we fail the
1914                  * entire READDIR operation(!)
1915                  */
1916                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1917                         goto fail;
1918                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1919                 if (p == NULL) {
1920                         nfserr = nfserr_toosmall;
1921                         goto fail;
1922                 }
1923         }
1924         cd->buflen -= (p - cd->buffer);
1925         cd->buffer = p;
1926         cd->common.err = nfs_ok;
1927         return 0;
1928 fail:
1929         cd->common.err = nfserr;
1930         return -EINVAL;
1931 }
1932
1933 static void
1934 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1935 {
1936         ENCODE_HEAD;
1937
1938         if (!nfserr) {
1939                 RESERVE_SPACE(8);
1940                 WRITE32(access->ac_supported);
1941                 WRITE32(access->ac_resp_access);
1942                 ADJUST_ARGS();
1943         }
1944 }
1945
1946 static void
1947 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1948 {
1949         ENCODE_SEQID_OP_HEAD;
1950
1951         if (!nfserr) {
1952                 RESERVE_SPACE(sizeof(stateid_t));
1953                 WRITE32(close->cl_stateid.si_generation);
1954                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1955                 ADJUST_ARGS();
1956         }
1957         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1958 }
1959
1960
1961 static void
1962 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
1963 {
1964         ENCODE_HEAD;
1965
1966         if (!nfserr) {
1967                 RESERVE_SPACE(8);
1968                 WRITEMEM(commit->co_verf.data, 8);
1969                 ADJUST_ARGS();
1970         }
1971 }
1972
1973 static void
1974 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
1975 {
1976         ENCODE_HEAD;
1977
1978         if (!nfserr) {
1979                 RESERVE_SPACE(32);
1980                 WRITECINFO(create->cr_cinfo);
1981                 WRITE32(2);
1982                 WRITE32(create->cr_bmval[0]);
1983                 WRITE32(create->cr_bmval[1]);
1984                 ADJUST_ARGS();
1985         }
1986 }
1987
1988 static __be32
1989 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
1990 {
1991         struct svc_fh *fhp = getattr->ga_fhp;
1992         int buflen;
1993
1994         if (nfserr)
1995                 return nfserr;
1996
1997         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
1998         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
1999                                     resp->p, &buflen, getattr->ga_bmval,
2000                                     resp->rqstp, 0);
2001         if (!nfserr)
2002                 resp->p += buflen;
2003         return nfserr;
2004 }
2005
2006 static void
2007 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh *fhp)
2008 {
2009         unsigned int len;
2010         ENCODE_HEAD;
2011
2012         if (!nfserr) {
2013                 len = fhp->fh_handle.fh_size;
2014                 RESERVE_SPACE(len + 4);
2015                 WRITE32(len);
2016                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2017                 ADJUST_ARGS();
2018         }
2019 }
2020
2021 /*
2022 * Including all fields other than the name, a LOCK4denied structure requires
2023 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2024 */
2025 static void
2026 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2027 {
2028         ENCODE_HEAD;
2029
2030         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2031         WRITE64(ld->ld_start);
2032         WRITE64(ld->ld_length);
2033         WRITE32(ld->ld_type);
2034         if (ld->ld_sop) {
2035                 WRITEMEM(&ld->ld_clientid, 8);
2036                 WRITE32(ld->ld_sop->so_owner.len);
2037                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2038                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2039         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2040                 WRITE64((u64)0); /* clientid */
2041                 WRITE32(0); /* length of owner name */
2042         }
2043         ADJUST_ARGS();
2044 }
2045
2046 static void
2047 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2048 {
2049         ENCODE_SEQID_OP_HEAD;
2050
2051         if (!nfserr) {
2052                 RESERVE_SPACE(4 + sizeof(stateid_t));
2053                 WRITE32(lock->lk_resp_stateid.si_generation);
2054                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2055                 ADJUST_ARGS();
2056         } else if (nfserr == nfserr_denied)
2057                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2058
2059         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2060 }
2061
2062 static void
2063 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2064 {
2065         if (nfserr == nfserr_denied)
2066                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2067 }
2068
2069 static void
2070 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2071 {
2072         ENCODE_SEQID_OP_HEAD;
2073
2074         if (!nfserr) {
2075                 RESERVE_SPACE(sizeof(stateid_t));
2076                 WRITE32(locku->lu_stateid.si_generation);
2077                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2078                 ADJUST_ARGS();
2079         }
2080
2081         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2082 }
2083
2084
2085 static void
2086 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2087 {
2088         ENCODE_HEAD;
2089
2090         if (!nfserr) {
2091                 RESERVE_SPACE(20);
2092                 WRITECINFO(link->li_cinfo);
2093                 ADJUST_ARGS();
2094         }
2095 }
2096
2097
2098 static void
2099 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2100 {
2101         ENCODE_SEQID_OP_HEAD;
2102
2103         if (nfserr)
2104                 goto out;
2105
2106         RESERVE_SPACE(36 + sizeof(stateid_t));
2107         WRITE32(open->op_stateid.si_generation);
2108         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2109         WRITECINFO(open->op_cinfo);
2110         WRITE32(open->op_rflags);
2111         WRITE32(2);
2112         WRITE32(open->op_bmval[0]);
2113         WRITE32(open->op_bmval[1]);
2114         WRITE32(open->op_delegate_type);
2115         ADJUST_ARGS();
2116
2117         switch (open->op_delegate_type) {
2118         case NFS4_OPEN_DELEGATE_NONE:
2119                 break;
2120         case NFS4_OPEN_DELEGATE_READ:
2121                 RESERVE_SPACE(20 + sizeof(stateid_t));
2122                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2123                 WRITE32(open->op_recall);
2124
2125                 /*
2126                  * TODO: ACE's in delegations
2127                  */
2128                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2129                 WRITE32(0);
2130                 WRITE32(0);
2131                 WRITE32(0);   /* XXX: is NULL principal ok? */
2132                 ADJUST_ARGS();
2133                 break;
2134         case NFS4_OPEN_DELEGATE_WRITE:
2135                 RESERVE_SPACE(32 + sizeof(stateid_t));
2136                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2137                 WRITE32(0);
2138
2139                 /*
2140                  * TODO: space_limit's in delegations
2141                  */
2142                 WRITE32(NFS4_LIMIT_SIZE);
2143                 WRITE32(~(u32)0);
2144                 WRITE32(~(u32)0);
2145
2146                 /*
2147                  * TODO: ACE's in delegations
2148                  */
2149                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2150                 WRITE32(0);
2151                 WRITE32(0);
2152                 WRITE32(0);   /* XXX: is NULL principal ok? */
2153                 ADJUST_ARGS();
2154                 break;
2155         default:
2156                 BUG();
2157         }
2158         /* XXX save filehandle here */
2159 out:
2160         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2161 }
2162
2163 static void
2164 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2165 {
2166         ENCODE_SEQID_OP_HEAD;
2167
2168         if (!nfserr) {
2169                 RESERVE_SPACE(sizeof(stateid_t));
2170                 WRITE32(oc->oc_resp_stateid.si_generation);
2171                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2172                 ADJUST_ARGS();
2173         }
2174
2175         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2176 }
2177
2178 static void
2179 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2180 {
2181         ENCODE_SEQID_OP_HEAD;
2182
2183         if (!nfserr) {
2184                 RESERVE_SPACE(sizeof(stateid_t));
2185                 WRITE32(od->od_stateid.si_generation);
2186                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2187                 ADJUST_ARGS();
2188         }
2189
2190         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2191 }
2192
2193 static __be32
2194 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2195                   struct nfsd4_read *read)
2196 {
2197         u32 eof;
2198         int v, pn;
2199         unsigned long maxcount;
2200         long len;
2201         ENCODE_HEAD;
2202
2203         if (nfserr)
2204                 return nfserr;
2205         if (resp->xbuf->page_len)
2206                 return nfserr_resource;
2207
2208         RESERVE_SPACE(8); /* eof flag and byte count */
2209
2210         maxcount = svc_max_payload(resp->rqstp);
2211         if (maxcount > read->rd_length)
2212                 maxcount = read->rd_length;
2213
2214         len = maxcount;
2215         v = 0;
2216         while (len > 0) {
2217                 pn = resp->rqstp->rq_resused++;
2218                 resp->rqstp->rq_vec[v].iov_base =
2219                         page_address(resp->rqstp->rq_respages[pn]);
2220                 resp->rqstp->rq_vec[v].iov_len =
2221                         len < PAGE_SIZE ? len : PAGE_SIZE;
2222                 v++;
2223                 len -= PAGE_SIZE;
2224         }
2225         read->rd_vlen = v;
2226
2227         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2228                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2229                         &maxcount);
2230
2231         if (nfserr == nfserr_symlink)
2232                 nfserr = nfserr_inval;
2233         if (nfserr)
2234                 return nfserr;
2235         eof = (read->rd_offset + maxcount >=
2236                read->rd_fhp->fh_dentry->d_inode->i_size);
2237
2238         WRITE32(eof);
2239         WRITE32(maxcount);
2240         ADJUST_ARGS();
2241         resp->xbuf->head[0].iov_len = (char*)p
2242                                         - (char*)resp->xbuf->head[0].iov_base;
2243         resp->xbuf->page_len = maxcount;
2244
2245         /* Use rest of head for padding and remaining ops: */
2246         resp->xbuf->tail[0].iov_base = p;
2247         resp->xbuf->tail[0].iov_len = 0;
2248         if (maxcount&3) {
2249                 RESERVE_SPACE(4);
2250                 WRITE32(0);
2251                 resp->xbuf->tail[0].iov_base += maxcount&3;
2252                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2253                 ADJUST_ARGS();
2254         }
2255         return 0;
2256 }
2257
2258 static __be32
2259 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2260 {
2261         int maxcount;
2262         char *page;
2263         ENCODE_HEAD;
2264
2265         if (nfserr)
2266                 return nfserr;
2267         if (resp->xbuf->page_len)
2268                 return nfserr_resource;
2269
2270         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2271
2272         maxcount = PAGE_SIZE;
2273         RESERVE_SPACE(4);
2274
2275         /*
2276          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2277          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2278          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2279          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2280          */
2281         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2282         if (nfserr == nfserr_isdir)
2283                 return nfserr_inval;
2284         if (nfserr)
2285                 return nfserr;
2286
2287         WRITE32(maxcount);
2288         ADJUST_ARGS();
2289         resp->xbuf->head[0].iov_len = (char*)p
2290                                 - (char*)resp->xbuf->head[0].iov_base;
2291         resp->xbuf->page_len = maxcount;
2292
2293         /* Use rest of head for padding and remaining ops: */
2294         resp->xbuf->tail[0].iov_base = p;
2295         resp->xbuf->tail[0].iov_len = 0;
2296         if (maxcount&3) {
2297                 RESERVE_SPACE(4);
2298                 WRITE32(0);
2299                 resp->xbuf->tail[0].iov_base += maxcount&3;
2300                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2301                 ADJUST_ARGS();
2302         }
2303         return 0;
2304 }
2305
2306 static __be32
2307 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2308 {
2309         int maxcount;
2310         loff_t offset;
2311         __be32 *page, *savep, *tailbase;
2312         ENCODE_HEAD;
2313
2314         if (nfserr)
2315                 return nfserr;
2316         if (resp->xbuf->page_len)
2317                 return nfserr_resource;
2318
2319         RESERVE_SPACE(8);  /* verifier */
2320         savep = p;
2321
2322         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2323         WRITE32(0);
2324         WRITE32(0);
2325         ADJUST_ARGS();
2326         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2327         tailbase = p;
2328
2329         maxcount = PAGE_SIZE;
2330         if (maxcount > readdir->rd_maxcount)
2331                 maxcount = readdir->rd_maxcount;
2332
2333         /*
2334          * Convert from bytes to words, account for the two words already
2335          * written, make sure to leave two words at the end for the next
2336          * pointer and eof field.
2337          */
2338         maxcount = (maxcount >> 2) - 4;
2339         if (maxcount < 0) {
2340                 nfserr =  nfserr_toosmall;
2341                 goto err_no_verf;
2342         }
2343
2344         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2345         readdir->common.err = 0;
2346         readdir->buflen = maxcount;
2347         readdir->buffer = page;
2348         readdir->offset = NULL;
2349
2350         offset = readdir->rd_cookie;
2351         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2352                               &offset,
2353                               &readdir->common, nfsd4_encode_dirent);
2354         if (nfserr == nfs_ok &&
2355             readdir->common.err == nfserr_toosmall &&
2356             readdir->buffer == page)
2357                 nfserr = nfserr_toosmall;
2358         if (nfserr == nfserr_symlink)
2359                 nfserr = nfserr_notdir;
2360         if (nfserr)
2361                 goto err_no_verf;
2362
2363         if (readdir->offset)
2364                 xdr_encode_hyper(readdir->offset, offset);
2365
2366         p = readdir->buffer;
2367         *p++ = 0;       /* no more entries */
2368         *p++ = htonl(readdir->common.err == nfserr_eof);
2369         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2370                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2371
2372         /* Use rest of head for padding and remaining ops: */
2373         resp->xbuf->tail[0].iov_base = tailbase;
2374         resp->xbuf->tail[0].iov_len = 0;
2375         resp->p = resp->xbuf->tail[0].iov_base;
2376         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2377
2378         return 0;
2379 err_no_verf:
2380         p = savep;
2381         ADJUST_ARGS();
2382         return nfserr;
2383 }
2384
2385 static void
2386 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2387 {
2388         ENCODE_HEAD;
2389
2390         if (!nfserr) {
2391                 RESERVE_SPACE(20);
2392                 WRITECINFO(remove->rm_cinfo);
2393                 ADJUST_ARGS();
2394         }
2395 }
2396
2397 static void
2398 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2399 {
2400         ENCODE_HEAD;
2401
2402         if (!nfserr) {
2403                 RESERVE_SPACE(40);
2404                 WRITECINFO(rename->rn_sinfo);
2405                 WRITECINFO(rename->rn_tinfo);
2406                 ADJUST_ARGS();
2407         }
2408 }
2409
2410 static void
2411 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2412                      struct nfsd4_secinfo *secinfo)
2413 {
2414         int i = 0;
2415         struct svc_export *exp = secinfo->si_exp;
2416         u32 nflavs;
2417         struct exp_flavor_info *flavs;
2418         struct exp_flavor_info def_flavs[2];
2419         ENCODE_HEAD;
2420
2421         if (nfserr)
2422                 goto out;
2423         if (exp->ex_nflavors) {
2424                 flavs = exp->ex_flavors;
2425                 nflavs = exp->ex_nflavors;
2426         } else { /* Handling of some defaults in absence of real secinfo: */
2427                 flavs = def_flavs;
2428                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2429                         nflavs = 2;
2430                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2431                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2432                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2433                         nflavs = 1;
2434                         flavs[0].pseudoflavor
2435                                         = svcauth_gss_flavor(exp->ex_client);
2436                 } else {
2437                         nflavs = 1;
2438                         flavs[0].pseudoflavor
2439                                         = exp->ex_client->flavour->flavour;
2440                 }
2441         }
2442
2443         RESERVE_SPACE(4);
2444         WRITE32(nflavs);
2445         ADJUST_ARGS();
2446         for (i = 0; i < nflavs; i++) {
2447                 u32 flav = flavs[i].pseudoflavor;
2448                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2449
2450                 if (gm) {
2451                         RESERVE_SPACE(4);
2452                         WRITE32(RPC_AUTH_GSS);
2453                         ADJUST_ARGS();
2454                         RESERVE_SPACE(4 + gm->gm_oid.len);
2455                         WRITE32(gm->gm_oid.len);
2456                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2457                         ADJUST_ARGS();
2458                         RESERVE_SPACE(4);
2459                         WRITE32(0); /* qop */
2460                         ADJUST_ARGS();
2461                         RESERVE_SPACE(4);
2462                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2463                         ADJUST_ARGS();
2464                         gss_mech_put(gm);
2465                 } else {
2466                         RESERVE_SPACE(4);
2467                         WRITE32(flav);
2468                         ADJUST_ARGS();
2469                 }
2470         }
2471 out:
2472         if (exp)
2473                 exp_put(exp);
2474 }
2475
2476 /*
2477  * The SETATTR encode routine is special -- it always encodes a bitmap,
2478  * regardless of the error status.
2479  */
2480 static void
2481 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2482 {
2483         ENCODE_HEAD;
2484
2485         RESERVE_SPACE(12);
2486         if (nfserr) {
2487                 WRITE32(2);
2488                 WRITE32(0);
2489                 WRITE32(0);
2490         }
2491         else {
2492                 WRITE32(2);
2493                 WRITE32(setattr->sa_bmval[0]);
2494                 WRITE32(setattr->sa_bmval[1]);
2495         }
2496         ADJUST_ARGS();
2497 }
2498
2499 static void
2500 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2501 {
2502         ENCODE_HEAD;
2503
2504         if (!nfserr) {
2505                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2506                 WRITEMEM(&scd->se_clientid, 8);
2507                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2508                 ADJUST_ARGS();
2509         }
2510         else if (nfserr == nfserr_clid_inuse) {
2511                 RESERVE_SPACE(8);
2512                 WRITE32(0);
2513                 WRITE32(0);
2514                 ADJUST_ARGS();
2515         }
2516 }
2517
2518 static void
2519 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2520 {
2521         ENCODE_HEAD;
2522
2523         if (!nfserr) {
2524                 RESERVE_SPACE(16);
2525                 WRITE32(write->wr_bytes_written);
2526                 WRITE32(write->wr_how_written);
2527                 WRITEMEM(write->wr_verifier.data, 8);
2528                 ADJUST_ARGS();
2529         }
2530 }
2531
2532 void
2533 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2534 {
2535         __be32 *statp;
2536         ENCODE_HEAD;
2537
2538         RESERVE_SPACE(8);
2539         WRITE32(op->opnum);
2540         statp = p++;    /* to be backfilled at the end */
2541         ADJUST_ARGS();
2542
2543         switch (op->opnum) {
2544         case OP_ACCESS:
2545                 nfsd4_encode_access(resp, op->status, &op->u.access);
2546                 break;
2547         case OP_CLOSE:
2548                 nfsd4_encode_close(resp, op->status, &op->u.close);
2549                 break;
2550         case OP_COMMIT:
2551                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2552                 break;
2553         case OP_CREATE:
2554                 nfsd4_encode_create(resp, op->status, &op->u.create);
2555                 break;
2556         case OP_DELEGRETURN:
2557                 break;
2558         case OP_GETATTR:
2559                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2560                 break;
2561         case OP_GETFH:
2562                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2563                 break;
2564         case OP_LINK:
2565                 nfsd4_encode_link(resp, op->status, &op->u.link);
2566                 break;
2567         case OP_LOCK:
2568                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2569                 break;
2570         case OP_LOCKT:
2571                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2572                 break;
2573         case OP_LOCKU:
2574                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2575                 break;
2576         case OP_LOOKUP:
2577                 break;
2578         case OP_LOOKUPP:
2579                 break;
2580         case OP_NVERIFY:
2581                 break;
2582         case OP_OPEN:
2583                 nfsd4_encode_open(resp, op->status, &op->u.open);
2584                 break;
2585         case OP_OPEN_CONFIRM:
2586                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2587                 break;
2588         case OP_OPEN_DOWNGRADE:
2589                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2590                 break;
2591         case OP_PUTFH:
2592                 break;
2593         case OP_PUTROOTFH:
2594                 break;
2595         case OP_READ:
2596                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2597                 break;
2598         case OP_READDIR:
2599                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2600                 break;
2601         case OP_READLINK:
2602                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2603                 break;
2604         case OP_REMOVE:
2605                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2606                 break;
2607         case OP_RENAME:
2608                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2609                 break;
2610         case OP_RENEW:
2611                 break;
2612         case OP_RESTOREFH:
2613                 break;
2614         case OP_SAVEFH:
2615                 break;
2616         case OP_SECINFO:
2617                 nfsd4_encode_secinfo(resp, op->status, &op->u.secinfo);
2618                 break;
2619         case OP_SETATTR:
2620                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2621                 break;
2622         case OP_SETCLIENTID:
2623                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2624                 break;
2625         case OP_SETCLIENTID_CONFIRM:
2626                 break;
2627         case OP_VERIFY:
2628                 break;
2629         case OP_WRITE:
2630                 nfsd4_encode_write(resp, op->status, &op->u.write);
2631                 break;
2632         case OP_RELEASE_LOCKOWNER:
2633                 break;
2634         default:
2635                 break;
2636         }
2637
2638         /*
2639          * Note: We write the status directly, instead of using WRITE32(),
2640          * since it is already in network byte order.
2641          */
2642         *statp = op->status;
2643 }
2644
2645 /*
2646  * Encode the reply stored in the stateowner reply cache
2647  *
2648  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2649  * previously sent already encoded operation.
2650  *
2651  * called with nfs4_lock_state() held
2652  */
2653 void
2654 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2655 {
2656         ENCODE_HEAD;
2657         struct nfs4_replay *rp = op->replay;
2658
2659         BUG_ON(!rp);
2660
2661         RESERVE_SPACE(8);
2662         WRITE32(op->opnum);
2663         *p++ = rp->rp_status;  /* already xdr'ed */
2664         ADJUST_ARGS();
2665
2666         RESERVE_SPACE(rp->rp_buflen);
2667         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2668         ADJUST_ARGS();
2669 }
2670
2671 /*
2672  * END OF "GENERIC" ENCODE ROUTINES.
2673  */
2674
2675 int
2676 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2677 {
2678         return xdr_ressize_check(rqstp, p);
2679 }
2680
2681 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2682 {
2683         if (args->ops != args->iops) {
2684                 kfree(args->ops);
2685                 args->ops = args->iops;
2686         }
2687         kfree(args->tmpp);
2688         args->tmpp = NULL;
2689         while (args->to_free) {
2690                 struct tmpbuf *tb = args->to_free;
2691                 args->to_free = tb->next;
2692                 tb->release(tb->buf);
2693                 kfree(tb);
2694         }
2695 }
2696
2697 int
2698 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2699 {
2700         __be32 status;
2701
2702         args->p = p;
2703         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2704         args->pagelist = rqstp->rq_arg.pages;
2705         args->pagelen = rqstp->rq_arg.page_len;
2706         args->tmpp = NULL;
2707         args->to_free = NULL;
2708         args->ops = args->iops;
2709         args->rqstp = rqstp;
2710
2711         status = nfsd4_decode_compound(args);
2712         if (status) {
2713                 nfsd4_release_compoundargs(args);
2714         }
2715         return !status;
2716 }
2717
2718 int
2719 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2720 {
2721         /*
2722          * All that remains is to write the tag and operation count...
2723          */
2724         struct kvec *iov;
2725         p = resp->tagp;
2726         *p++ = htonl(resp->taglen);
2727         memcpy(p, resp->tag, resp->taglen);
2728         p += XDR_QUADLEN(resp->taglen);
2729         *p++ = htonl(resp->opcnt);
2730
2731         if (rqstp->rq_res.page_len)
2732                 iov = &rqstp->rq_res.tail[0];
2733         else
2734                 iov = &rqstp->rq_res.head[0];
2735         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2736         BUG_ON(iov->iov_len > PAGE_SIZE);
2737         return 1;
2738 }
2739
2740 /*
2741  * Local variables:
2742  *  c-basic-offset: 8
2743  * End:
2744  */