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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/smp_lock.h>
  48 #include <linux/fs.h>
  49 #include <linux/namei.h>
  50 #include <linux/vfs.h>
  51 #include <linux/sunrpc/xdr.h>
  52 #include <linux/sunrpc/svc.h>
  53 #include <linux/sunrpc/clnt.h>
  54 #include <linux/nfsd/nfsd.h>
  55 #include <linux/nfsd/state.h>
  56 #include <linux/nfsd/xdr4.h>
  57 #include <linux/nfsd_idmap.h>
  58 #include <linux/nfs4.h>
  59 #include <linux/nfs4_acl.h>
  60
  61 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  62
  63 /*
  64  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  65  * directory in order to indicate to the client that a filesystem boundary is present
  66  * We use a fixed fsid for a referral
  67  */
  68 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  69 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  70
  71 static __be32
  72 check_filename(char *str, int len, __be32 err)
  73 {
  74         int i;
  75
  76         if (len == 0)
  77                 return nfserr_inval;
  78         if (isdotent(str, len))
  79                 return err;
  80         for (i = 0; i < len; i++)
  81                 if (str[i] == '/')
  82                         return err;
  83         return 0;
  84 }
  85
  86 /*
  87  * START OF "GENERIC" DECODE ROUTINES.
  88  *   These may look a little ugly since they are imported from a "generic"
  89  * set of XDR encode/decode routines which are intended to be shared by
  90  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  91  *
  92  * If the pain of reading these is too great, it should be a straightforward
  93  * task to translate them into Linux-specific versions which are more
  94  * consistent with the style used in NFSv2/v3...
  95  */
  96 #define DECODE_HEAD                             \
  97         __be32 *p;                              \
  98         __be32 status
  99 #define DECODE_TAIL                             \
 100         status = 0;                             \
 101 out:                                            \
 102         return status;                          \
 103 xdr_error:                                      \
 104         printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 105         status = nfserr_bad_xdr;                \
 106         goto out
 107
 108 #define READ32(x)         (x) = ntohl(*p++)
 109 #define READ64(x)         do {                  \
 110         (x) = (u64)ntohl(*p++) << 32;           \
 111         (x) |= ntohl(*p++);                     \
 112 } while (0)
 113 #define READTIME(x)       do {                  \
 114         p++;                                    \
 115         (x) = ntohl(*p++);                      \
 116         p++;                                    \
 117 } while (0)
 118 #define READMEM(x,nbytes) do {                  \
 119         x = (char *)p;                          \
 120         p += XDR_QUADLEN(nbytes);               \
 121 } while (0)
 122 #define SAVEMEM(x,nbytes) do {                  \
 123         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 124                 savemem(argp, p, nbytes) :      \
 125                 (char *)p)) {                   \
 126                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 127                 goto xdr_error;                 \
 128                 }                               \
 129         p += XDR_QUADLEN(nbytes);               \
 130 } while (0)
 131 #define COPYMEM(x,nbytes) do {                  \
 132         memcpy((x), p, nbytes);                 \
 133         p += XDR_QUADLEN(nbytes);               \
 134 } while (0)
 135
 136 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 137 #define READ_BUF(nbytes)  do {                  \
 138         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 139                 p = argp->p;                    \
 140                 argp->p += XDR_QUADLEN(nbytes); \
 141         } else if (!(p = read_buf(argp, nbytes))) { \
 142                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 143                 goto xdr_error;                 \
 144         }                                       \
 145 } while (0)
 146
 147 static __be32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
 148 {
 149         /* We want more bytes than seem to be available.
 150          * Maybe we need a new page, maybe we have just run out
 151          */
 152         int avail = (char*)argp->end - (char*)argp->p;
 153         __be32 *p;
 154         if (avail + argp->pagelen < nbytes)
 155                 return NULL;
 156         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 157                 return NULL;
 158         /* ok, we can do it with the current plus the next page */
 159         if (nbytes <= sizeof(argp->tmp))
 160                 p = argp->tmp;
 161         else {
 162                 kfree(argp->tmpp);
 163                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 164                 if (!p)
 165                         return NULL;
 166
 167         }
 168         memcpy(p, argp->p, avail);
 169         /* step to next page */
 170         argp->p = page_address(argp->pagelist[0]);
 171         argp->pagelist++;
 172         if (argp->pagelen < PAGE_SIZE) {
 173                 argp->end = p + (argp->pagelen>>2);
 174                 argp->pagelen = 0;
 175         } else {
 176                 argp->end = p + (PAGE_SIZE>>2);
 177                 argp->pagelen -= PAGE_SIZE;
 178         }
 179         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 180         argp->p += XDR_QUADLEN(nbytes - avail);
 181         return p;
 182 }
 183
 184 static int
 185 defer_free(struct nfsd4_compoundargs *argp,
 186                 void (*release)(const void *), void *p)
 187 {
 188         struct tmpbuf *tb;
 189
 190         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 191         if (!tb)
 192                 return -ENOMEM;
 193         tb->buf = p;
 194         tb->release = release;
 195         tb->next = argp->to_free;
 196         argp->to_free = tb;
 197         return 0;
 198 }
 199
 200 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 201 {
 202         void *new = NULL;
 203         if (p == argp->tmp) {
 204                 new = kmalloc(nbytes, GFP_KERNEL);
 205                 if (!new) return NULL;
 206                 p = new;
 207                 memcpy(p, argp->tmp, nbytes);
 208         } else {
 209                 BUG_ON(p != argp->tmpp);
 210                 argp->tmpp = NULL;
 211         }
 212         if (defer_free(argp, kfree, p)) {
 213                 kfree(new);
 214                 return NULL;
 215         } else
 216                 return (char *)p;
 217 }
 218
 219
 220 static __be32
 221 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 222 {
 223         u32 bmlen;
 224         DECODE_HEAD;
 225
 226         bmval[0] = 0;
 227         bmval[1] = 0;
 228
 229         READ_BUF(4);
 230         READ32(bmlen);
 231         if (bmlen > 1000)
 232                 goto xdr_error;
 233
 234         READ_BUF(bmlen << 2);
 235         if (bmlen > 0)
 236                 READ32(bmval[0]);
 237         if (bmlen > 1)
 238                 READ32(bmval[1]);
 239
 240         DECODE_TAIL;
 241 }
 242
 243 static __be32
 244 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 245     struct nfs4_acl **acl)
 246 {
 247         int expected_len, len = 0;
 248         u32 dummy32;
 249         char *buf;
 250         int host_err;
 251
 252         DECODE_HEAD;
 253         iattr->ia_valid = 0;
 254         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 255                 return status;
 256
 257         /*
 258          * According to spec, unsupported attributes return ERR_NOTSUPP;
 259          * read-only attributes return ERR_INVAL.
 260          */
 261         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 262                 return nfserr_attrnotsupp;
 263         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 264                 return nfserr_inval;
 265
 266         READ_BUF(4);
 267         READ32(expected_len);
 268
 269         if (bmval[0] & FATTR4_WORD0_SIZE) {
 270                 READ_BUF(8);
 271                 len += 8;
 272                 READ64(iattr->ia_size);
 273                 iattr->ia_valid |= ATTR_SIZE;
 274         }
 275         if (bmval[0] & FATTR4_WORD0_ACL) {
 276                 int nace, i;
 277                 struct nfs4_ace ace;
 278
 279                 READ_BUF(4); len += 4;
 280                 READ32(nace);
 281
 282                 *acl = nfs4_acl_new();
 283                 if (*acl == NULL) {
 284                         host_err = -ENOMEM;
 285                         goto out_nfserr;
 286                 }
 287                 defer_free(argp, (void (*)(const void *))nfs4_acl_free, *acl);
 288
 289                 for (i = 0; i < nace; i++) {
 290                         READ_BUF(16); len += 16;
 291                         READ32(ace.type);
 292                         READ32(ace.flag);
 293                         READ32(ace.access_mask);
 294                         READ32(dummy32);
 295                         READ_BUF(dummy32);
 296                         len += XDR_QUADLEN(dummy32) << 2;
 297                         READMEM(buf, dummy32);
 298                         ace.whotype = nfs4_acl_get_whotype(buf, dummy32);
 299                         host_err = 0;
 300                         if (ace.whotype != NFS4_ACL_WHO_NAMED)
 301                                 ace.who = 0;
 302                         else if (ace.flag & NFS4_ACE_IDENTIFIER_GROUP)
 303                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 304                                                 buf, dummy32, &ace.who);
 305                         else
 306                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 307                                                 buf, dummy32, &ace.who);
 308                         if (host_err)
 309                                 goto out_nfserr;
 310                         host_err = nfs4_acl_add_ace(*acl, ace.type, ace.flag,
 311                                  ace.access_mask, ace.whotype, ace.who);
 312                         if (host_err)
 313                                 goto out_nfserr;
 314                 }
 315         } else
 316                 *acl = NULL;
 317         if (bmval[1] & FATTR4_WORD1_MODE) {
 318                 READ_BUF(4);
 319                 len += 4;
 320                 READ32(iattr->ia_mode);
 321                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 322                 iattr->ia_valid |= ATTR_MODE;
 323         }
 324         if (bmval[1] & FATTR4_WORD1_OWNER) {
 325                 READ_BUF(4);
 326                 len += 4;
 327                 READ32(dummy32);
 328                 READ_BUF(dummy32);
 329                 len += (XDR_QUADLEN(dummy32) << 2);
 330                 READMEM(buf, dummy32);
 331                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 332                         goto out_nfserr;
 333                 iattr->ia_valid |= ATTR_UID;
 334         }
 335         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 336                 READ_BUF(4);
 337                 len += 4;
 338                 READ32(dummy32);
 339                 READ_BUF(dummy32);
 340                 len += (XDR_QUADLEN(dummy32) << 2);
 341                 READMEM(buf, dummy32);
 342                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 343                         goto out_nfserr;
 344                 iattr->ia_valid |= ATTR_GID;
 345         }
 346         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 347                 READ_BUF(4);
 348                 len += 4;
 349                 READ32(dummy32);
 350                 switch (dummy32) {
 351                 case NFS4_SET_TO_CLIENT_TIME:
 352                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 353                            all 32 bits of 'nseconds'. */
 354                         READ_BUF(12);
 355                         len += 12;
 356                         READ32(dummy32);
 357                         if (dummy32)
 358                                 return nfserr_inval;
 359                         READ32(iattr->ia_atime.tv_sec);
 360                         READ32(iattr->ia_atime.tv_nsec);
 361                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 362                                 return nfserr_inval;
 363                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 364                         break;
 365                 case NFS4_SET_TO_SERVER_TIME:
 366                         iattr->ia_valid |= ATTR_ATIME;
 367                         break;
 368                 default:
 369                         goto xdr_error;
 370                 }
 371         }
 372         if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
 373                 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 374                    all 32 bits of 'nseconds'. */
 375                 READ_BUF(12);
 376                 len += 12;
 377                 READ32(dummy32);
 378                 if (dummy32)
 379                         return nfserr_inval;
 380                 READ32(iattr->ia_ctime.tv_sec);
 381                 READ32(iattr->ia_ctime.tv_nsec);
 382                 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
 383                         return nfserr_inval;
 384                 iattr->ia_valid |= ATTR_CTIME;
 385         }
 386         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 387                 READ_BUF(4);
 388                 len += 4;
 389                 READ32(dummy32);
 390                 switch (dummy32) {
 391                 case NFS4_SET_TO_CLIENT_TIME:
 392                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 393                            all 32 bits of 'nseconds'. */
 394                         READ_BUF(12);
 395                         len += 12;
 396                         READ32(dummy32);
 397                         if (dummy32)
 398                                 return nfserr_inval;
 399                         READ32(iattr->ia_mtime.tv_sec);
 400                         READ32(iattr->ia_mtime.tv_nsec);
 401                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 402                                 return nfserr_inval;
 403                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 404                         break;
 405                 case NFS4_SET_TO_SERVER_TIME:
 406                         iattr->ia_valid |= ATTR_MTIME;
 407                         break;
 408                 default:
 409                         goto xdr_error;
 410                 }
 411         }
 412         if (len != expected_len)
 413                 goto xdr_error;
 414
 415         DECODE_TAIL;
 416
 417 out_nfserr:
 418         status = nfserrno(host_err);
 419         goto out;
 420 }
 421
 422 static __be32
 423 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 424 {
 425         DECODE_HEAD;
 426
 427         READ_BUF(4);
 428         READ32(access->ac_req_access);
 429
 430         DECODE_TAIL;
 431 }
 432
 433 static __be32
 434 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 435 {
 436         DECODE_HEAD;
 437
 438         close->cl_stateowner = NULL;
 439         READ_BUF(4 + sizeof(stateid_t));
 440         READ32(close->cl_seqid);
 441         READ32(close->cl_stateid.si_generation);
 442         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
 443
 444         DECODE_TAIL;
 445 }
 446
 447
 448 static __be32
 449 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 450 {
 451         DECODE_HEAD;
 452
 453         READ_BUF(12);
 454         READ64(commit->co_offset);
 455         READ32(commit->co_count);
 456
 457         DECODE_TAIL;
 458 }
 459
 460 static __be32
 461 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 462 {
 463         DECODE_HEAD;
 464
 465         READ_BUF(4);
 466         READ32(create->cr_type);
 467         switch (create->cr_type) {
 468         case NF4LNK:
 469                 READ_BUF(4);
 470                 READ32(create->cr_linklen);
 471                 READ_BUF(create->cr_linklen);
 472                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 473                 break;
 474         case NF4BLK:
 475         case NF4CHR:
 476                 READ_BUF(8);
 477                 READ32(create->cr_specdata1);
 478                 READ32(create->cr_specdata2);
 479                 break;
 480         case NF4SOCK:
 481         case NF4FIFO:
 482         case NF4DIR:
 483         default:
 484                 break;
 485         }
 486
 487         READ_BUF(4);
 488         READ32(create->cr_namelen);
 489         READ_BUF(create->cr_namelen);
 490         SAVEMEM(create->cr_name, create->cr_namelen);
 491         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 492                 return status;
 493
 494         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 495                 goto out;
 496
 497         DECODE_TAIL;
 498 }
 499
 500 static inline __be32
 501 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 502 {
 503         DECODE_HEAD;
 504
 505         READ_BUF(sizeof(stateid_t));
 506         READ32(dr->dr_stateid.si_generation);
 507         COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
 508
 509         DECODE_TAIL;
 510 }
 511
 512 static inline __be32
 513 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 514 {
 515         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 516 }
 517
 518 static __be32
 519 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 520 {
 521         DECODE_HEAD;
 522
 523         READ_BUF(4);
 524         READ32(link->li_namelen);
 525         READ_BUF(link->li_namelen);
 526         SAVEMEM(link->li_name, link->li_namelen);
 527         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 528                 return status;
 529
 530         DECODE_TAIL;
 531 }
 532
 533 static __be32
 534 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 535 {
 536         DECODE_HEAD;
 537
 538         lock->lk_replay_owner = NULL;
 539         /*
 540         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 541         */
 542         READ_BUF(28);
 543         READ32(lock->lk_type);
 544         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 545                 goto xdr_error;
 546         READ32(lock->lk_reclaim);
 547         READ64(lock->lk_offset);
 548         READ64(lock->lk_length);
 549         READ32(lock->lk_is_new);
 550
 551         if (lock->lk_is_new) {
 552                 READ_BUF(36);
 553                 READ32(lock->lk_new_open_seqid);
 554                 READ32(lock->lk_new_open_stateid.si_generation);
 555
 556                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
 557                 READ32(lock->lk_new_lock_seqid);
 558                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 559                 READ32(lock->lk_new_owner.len);
 560                 READ_BUF(lock->lk_new_owner.len);
 561                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 562         } else {
 563                 READ_BUF(20);
 564                 READ32(lock->lk_old_lock_stateid.si_generation);
 565                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
 566                 READ32(lock->lk_old_lock_seqid);
 567         }
 568
 569         DECODE_TAIL;
 570 }
 571
 572 static __be32
 573 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 574 {
 575         DECODE_HEAD;
 576
 577         READ_BUF(32);
 578         READ32(lockt->lt_type);
 579         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 580                 goto xdr_error;
 581         READ64(lockt->lt_offset);
 582         READ64(lockt->lt_length);
 583         COPYMEM(&lockt->lt_clientid, 8);
 584         READ32(lockt->lt_owner.len);
 585         READ_BUF(lockt->lt_owner.len);
 586         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 587
 588         DECODE_TAIL;
 589 }
 590
 591 static __be32
 592 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 593 {
 594         DECODE_HEAD;
 595
 596         locku->lu_stateowner = NULL;
 597         READ_BUF(24 + sizeof(stateid_t));
 598         READ32(locku->lu_type);
 599         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 600                 goto xdr_error;
 601         READ32(locku->lu_seqid);
 602         READ32(locku->lu_stateid.si_generation);
 603         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
 604         READ64(locku->lu_offset);
 605         READ64(locku->lu_length);
 606
 607         DECODE_TAIL;
 608 }
 609
 610 static __be32
 611 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 612 {
 613         DECODE_HEAD;
 614
 615         READ_BUF(4);
 616         READ32(lookup->lo_len);
 617         READ_BUF(lookup->lo_len);
 618         SAVEMEM(lookup->lo_name, lookup->lo_len);
 619         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 620                 return status;
 621
 622         DECODE_TAIL;
 623 }
 624
 625 static __be32
 626 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 627 {
 628         DECODE_HEAD;
 629
 630         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 631         open->op_iattr.ia_valid = 0;
 632         open->op_stateowner = NULL;
 633
 634         /* seqid, share_access, share_deny, clientid, ownerlen */
 635         READ_BUF(16 + sizeof(clientid_t));
 636         READ32(open->op_seqid);
 637         READ32(open->op_share_access);
 638         READ32(open->op_share_deny);
 639         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 640         READ32(open->op_owner.len);
 641
 642         /* owner, open_flag */
 643         READ_BUF(open->op_owner.len + 4);
 644         SAVEMEM(open->op_owner.data, open->op_owner.len);
 645         READ32(open->op_create);
 646         switch (open->op_create) {
 647         case NFS4_OPEN_NOCREATE:
 648                 break;
 649         case NFS4_OPEN_CREATE:
 650                 READ_BUF(4);
 651                 READ32(open->op_createmode);
 652                 switch (open->op_createmode) {
 653                 case NFS4_CREATE_UNCHECKED:
 654                 case NFS4_CREATE_GUARDED:
 655                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 656                                 goto out;
 657                         break;
 658                 case NFS4_CREATE_EXCLUSIVE:
 659                         READ_BUF(8);
 660                         COPYMEM(open->op_verf.data, 8);
 661                         break;
 662                 default:
 663                         goto xdr_error;
 664                 }
 665                 break;
 666         default:
 667                 goto xdr_error;
 668         }
 669
 670         /* open_claim */
 671         READ_BUF(4);
 672         READ32(open->op_claim_type);
 673         switch (open->op_claim_type) {
 674         case NFS4_OPEN_CLAIM_NULL:
 675         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 676                 READ_BUF(4);
 677                 READ32(open->op_fname.len);
 678                 READ_BUF(open->op_fname.len);
 679                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 680                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 681                         return status;
 682                 break;
 683         case NFS4_OPEN_CLAIM_PREVIOUS:
 684                 READ_BUF(4);
 685                 READ32(open->op_delegate_type);
 686                 break;
 687         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 688                 READ_BUF(sizeof(stateid_t) + 4);
 689                 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
 690                 READ32(open->op_fname.len);
 691                 READ_BUF(open->op_fname.len);
 692                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 693                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 694                         return status;
 695                 break;
 696         default:
 697                 goto xdr_error;
 698         }
 699
 700         DECODE_TAIL;
 701 }
 702
 703 static __be32
 704 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 705 {
 706         DECODE_HEAD;
 707
 708         open_conf->oc_stateowner = NULL;
 709         READ_BUF(4 + sizeof(stateid_t));
 710         READ32(open_conf->oc_req_stateid.si_generation);
 711         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
 712         READ32(open_conf->oc_seqid);
 713
 714         DECODE_TAIL;
 715 }
 716
 717 static __be32
 718 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 719 {
 720         DECODE_HEAD;
 721
 722         open_down->od_stateowner = NULL;
 723         READ_BUF(12 + sizeof(stateid_t));
 724         READ32(open_down->od_stateid.si_generation);
 725         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
 726         READ32(open_down->od_seqid);
 727         READ32(open_down->od_share_access);
 728         READ32(open_down->od_share_deny);
 729
 730         DECODE_TAIL;
 731 }
 732
 733 static __be32
 734 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 735 {
 736         DECODE_HEAD;
 737
 738         READ_BUF(4);
 739         READ32(putfh->pf_fhlen);
 740         if (putfh->pf_fhlen > NFS4_FHSIZE)
 741                 goto xdr_error;
 742         READ_BUF(putfh->pf_fhlen);
 743         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 744
 745         DECODE_TAIL;
 746 }
 747
 748 static __be32
 749 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 750 {
 751         DECODE_HEAD;
 752
 753         READ_BUF(sizeof(stateid_t) + 12);
 754         READ32(read->rd_stateid.si_generation);
 755         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
 756         READ64(read->rd_offset);
 757         READ32(read->rd_length);
 758
 759         DECODE_TAIL;
 760 }
 761
 762 static __be32
 763 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 764 {
 765         DECODE_HEAD;
 766
 767         READ_BUF(24);
 768         READ64(readdir->rd_cookie);
 769         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 770         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 771         READ32(readdir->rd_maxcount);
 772         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 773                 goto out;
 774
 775         DECODE_TAIL;
 776 }
 777
 778 static __be32
 779 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 780 {
 781         DECODE_HEAD;
 782
 783         READ_BUF(4);
 784         READ32(remove->rm_namelen);
 785         READ_BUF(remove->rm_namelen);
 786         SAVEMEM(remove->rm_name, remove->rm_namelen);
 787         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 788                 return status;
 789
 790         DECODE_TAIL;
 791 }
 792
 793 static __be32
 794 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 795 {
 796         DECODE_HEAD;
 797
 798         READ_BUF(4);
 799         READ32(rename->rn_snamelen);
 800         READ_BUF(rename->rn_snamelen + 4);
 801         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 802         READ32(rename->rn_tnamelen);
 803         READ_BUF(rename->rn_tnamelen);
 804         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 805         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 806                 return status;
 807         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 808                 return status;
 809
 810         DECODE_TAIL;
 811 }
 812
 813 static __be32
 814 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 815 {
 816         DECODE_HEAD;
 817
 818         READ_BUF(sizeof(clientid_t));
 819         COPYMEM(clientid, sizeof(clientid_t));
 820
 821         DECODE_TAIL;
 822 }
 823
 824 static __be32
 825 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 826 {
 827         DECODE_HEAD;
 828
 829         READ_BUF(sizeof(stateid_t));
 830         READ32(setattr->sa_stateid.si_generation);
 831         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 832         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 833                 goto out;
 834
 835         DECODE_TAIL;
 836 }
 837
 838 static __be32
 839 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 840 {
 841         DECODE_HEAD;
 842
 843         READ_BUF(12);
 844         COPYMEM(setclientid->se_verf.data, 8);
 845         READ32(setclientid->se_namelen);
 846
 847         READ_BUF(setclientid->se_namelen + 8);
 848         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 849         READ32(setclientid->se_callback_prog);
 850         READ32(setclientid->se_callback_netid_len);
 851
 852         READ_BUF(setclientid->se_callback_netid_len + 4);
 853         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 854         READ32(setclientid->se_callback_addr_len);
 855
 856         READ_BUF(setclientid->se_callback_addr_len + 4);
 857         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 858         READ32(setclientid->se_callback_ident);
 859
 860         DECODE_TAIL;
 861 }
 862
 863 static __be32
 864 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 865 {
 866         DECODE_HEAD;
 867
 868         READ_BUF(8 + sizeof(nfs4_verifier));
 869         COPYMEM(&scd_c->sc_clientid, 8);
 870         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 871
 872         DECODE_TAIL;
 873 }
 874
 875 /* Also used for NVERIFY */
 876 static __be32
 877 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 878 {
 879 #if 0
 880         struct nfsd4_compoundargs save = {
 881                 .p = argp->p,
 882                 .end = argp->end,
 883                 .rqstp = argp->rqstp,
 884         };
 885         u32             ve_bmval[2];
 886         struct iattr    ve_iattr;           /* request */
 887         struct nfs4_acl *ve_acl;            /* request */
 888 #endif
 889         DECODE_HEAD;
 890
 891         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 892                 goto out;
 893
 894         /* For convenience's sake, we compare raw xdr'd attributes in
 895          * nfsd4_proc_verify; however we still decode here just to return
 896          * correct error in case of bad xdr. */
 897 #if 0
 898         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 899         if (status == nfserr_inval) {
 900                 status = nfserrno(status);
 901                 goto out;
 902         }
 903 #endif
 904         READ_BUF(4);
 905         READ32(verify->ve_attrlen);
 906         READ_BUF(verify->ve_attrlen);
 907         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 908
 909         DECODE_TAIL;
 910 }
 911
 912 static __be32
 913 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 914 {
 915         int avail;
 916         int v;
 917         int len;
 918         DECODE_HEAD;
 919
 920         READ_BUF(sizeof(stateid_opaque_t) + 20);
 921         READ32(write->wr_stateid.si_generation);
 922         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
 923         READ64(write->wr_offset);
 924         READ32(write->wr_stable_how);
 925         if (write->wr_stable_how > 2)
 926                 goto xdr_error;
 927         READ32(write->wr_buflen);
 928
 929         /* Sorry .. no magic macros for this.. *
 930          * READ_BUF(write->wr_buflen);
 931          * SAVEMEM(write->wr_buf, write->wr_buflen);
 932          */
 933         avail = (char*)argp->end - (char*)argp->p;
 934         if (avail + argp->pagelen < write->wr_buflen) {
 935                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__);
 936                 goto xdr_error;
 937         }
 938         argp->rqstp->rq_vec[0].iov_base = p;
 939         argp->rqstp->rq_vec[0].iov_len = avail;
 940         v = 0;
 941         len = write->wr_buflen;
 942         while (len > argp->rqstp->rq_vec[v].iov_len) {
 943                 len -= argp->rqstp->rq_vec[v].iov_len;
 944                 v++;
 945                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 946                 argp->pagelist++;
 947                 if (argp->pagelen >= PAGE_SIZE) {
 948                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 949                         argp->pagelen -= PAGE_SIZE;
 950                 } else {
 951                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 952                         argp->pagelen -= len;
 953                 }
 954         }
 955         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 956         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 957         argp->rqstp->rq_vec[v].iov_len = len;
 958         write->wr_vlen = v+1;
 959
 960         DECODE_TAIL;
 961 }
 962
 963 static __be32
 964 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 965 {
 966         DECODE_HEAD;
 967
 968         READ_BUF(12);
 969         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 970         READ32(rlockowner->rl_owner.len);
 971         READ_BUF(rlockowner->rl_owner.len);
 972         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 973
 974         DECODE_TAIL;
 975 }
 976
 977 static __be32
 978 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 979 {
 980         DECODE_HEAD;
 981         struct nfsd4_op *op;
 982         int i;
 983
 984         /*
 985          * XXX: According to spec, we should check the tag
 986          * for UTF-8 compliance.  I'm postponing this for
 987          * now because it seems that some clients do use
 988          * binary tags.
 989          */
 990         READ_BUF(4);
 991         READ32(argp->taglen);
 992         READ_BUF(argp->taglen + 8);
 993         SAVEMEM(argp->tag, argp->taglen);
 994         READ32(argp->minorversion);
 995         READ32(argp->opcnt);
 996
 997         if (argp->taglen > NFSD4_MAX_TAGLEN)
 998                 goto xdr_error;
 999         if (argp->opcnt > 100)
1000                 goto xdr_error;
1001
1002         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1003                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1004                 if (!argp->ops) {
1005                         argp->ops = argp->iops;
1006                         printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
1007                         goto xdr_error;
1008                 }
1009         }
1010
1011         for (i = 0; i < argp->opcnt; i++) {
1012                 op = &argp->ops[i];
1013                 op->replay = NULL;
1014
1015                 /*
1016                  * We can't use READ_BUF() here because we need to handle
1017                  * a missing opcode as an OP_WRITE + 1. So we need to check
1018                  * to see if we're truly at the end of our buffer or if there
1019                  * is another page we need to flip to.
1020                  */
1021
1022                 if (argp->p == argp->end) {
1023                         if (argp->pagelen < 4) {
1024                                 /* There isn't an opcode still on the wire */
1025                                 op->opnum = OP_WRITE + 1;
1026                                 op->status = nfserr_bad_xdr;
1027                                 argp->opcnt = i+1;
1028                                 break;
1029                         }
1030
1031                         /*
1032                          * False alarm. We just hit a page boundary, but there
1033                          * is still data available.  Move pointer across page
1034                          * boundary.  *snip from READ_BUF*
1035                          */
1036                         argp->p = page_address(argp->pagelist[0]);
1037                         argp->pagelist++;
1038                         if (argp->pagelen < PAGE_SIZE) {
1039                                 argp->end = p + (argp->pagelen>>2);
1040                                 argp->pagelen = 0;
1041                         } else {
1042                                 argp->end = p + (PAGE_SIZE>>2);
1043                                 argp->pagelen -= PAGE_SIZE;
1044                         }
1045                 }
1046                 op->opnum = ntohl(*argp->p++);
1047
1048                 switch (op->opnum) {
1049                 case 2: /* Reserved operation */
1050                         op->opnum = OP_ILLEGAL;
1051                         if (argp->minorversion == 0)
1052                                 op->status = nfserr_op_illegal;
1053                         else
1054                                 op->status = nfserr_minor_vers_mismatch;
1055                         break;
1056                 case OP_ACCESS:
1057                         op->status = nfsd4_decode_access(argp, &op->u.access);
1058                         break;
1059                 case OP_CLOSE:
1060                         op->status = nfsd4_decode_close(argp, &op->u.close);
1061                         break;
1062                 case OP_COMMIT:
1063                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1064                         break;
1065                 case OP_CREATE:
1066                         op->status = nfsd4_decode_create(argp, &op->u.create);
1067                         break;
1068                 case OP_DELEGRETURN:
1069                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1070                         break;
1071                 case OP_GETATTR:
1072                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1073                         break;
1074                 case OP_GETFH:
1075                         op->status = nfs_ok;
1076                         break;
1077                 case OP_LINK:
1078                         op->status = nfsd4_decode_link(argp, &op->u.link);
1079                         break;
1080                 case OP_LOCK:
1081                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1082                         break;
1083                 case OP_LOCKT:
1084                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1085                         break;
1086                 case OP_LOCKU:
1087                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1088                         break;
1089                 case OP_LOOKUP:
1090                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1091                         break;
1092                 case OP_LOOKUPP:
1093                         op->status = nfs_ok;
1094                         break;
1095                 case OP_NVERIFY:
1096                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1097                         break;
1098                 case OP_OPEN:
1099                         op->status = nfsd4_decode_open(argp, &op->u.open);
1100                         break;
1101                 case OP_OPEN_CONFIRM:
1102                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1103                         break;
1104                 case OP_OPEN_DOWNGRADE:
1105                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1106                         break;
1107                 case OP_PUTFH:
1108                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1109                         break;
1110                 case OP_PUTROOTFH:
1111                         op->status = nfs_ok;
1112                         break;
1113                 case OP_READ:
1114                         op->status = nfsd4_decode_read(argp, &op->u.read);
1115                         break;
1116                 case OP_READDIR:
1117                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1118                         break;
1119                 case OP_READLINK:
1120                         op->status = nfs_ok;
1121                         break;
1122                 case OP_REMOVE:
1123                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1124                         break;
1125                 case OP_RENAME:
1126                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1127                         break;
1128                 case OP_RESTOREFH:
1129                         op->status = nfs_ok;
1130                         break;
1131                 case OP_RENEW:
1132                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1133                         break;
1134                 case OP_SAVEFH:
1135                         op->status = nfs_ok;
1136                         break;
1137                 case OP_SETATTR:
1138                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1139                         break;
1140                 case OP_SETCLIENTID:
1141                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1142                         break;
1143                 case OP_SETCLIENTID_CONFIRM:
1144                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1145                         break;
1146                 case OP_VERIFY:
1147                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1148                         break;
1149                 case OP_WRITE:
1150                         op->status = nfsd4_decode_write(argp, &op->u.write);
1151                         break;
1152                 case OP_RELEASE_LOCKOWNER:
1153                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1154                         break;
1155                 default:
1156                         op->opnum = OP_ILLEGAL;
1157                         op->status = nfserr_op_illegal;
1158                         break;
1159                 }
1160
1161                 if (op->status) {
1162                         argp->opcnt = i+1;
1163                         break;
1164                 }
1165         }
1166
1167         DECODE_TAIL;
1168 }
1169 /*
1170  * END OF "GENERIC" DECODE ROUTINES.
1171  */
1172
1173 /*
1174  * START OF "GENERIC" ENCODE ROUTINES.
1175  *   These may look a little ugly since they are imported from a "generic"
1176  * set of XDR encode/decode routines which are intended to be shared by
1177  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1178  *
1179  * If the pain of reading these is too great, it should be a straightforward
1180  * task to translate them into Linux-specific versions which are more
1181  * consistent with the style used in NFSv2/v3...
1182  */
1183 #define ENCODE_HEAD              __be32 *p
1184
1185 #define WRITE32(n)               *p++ = htonl(n)
1186 #define WRITE64(n)               do {                           \
1187         *p++ = htonl((u32)((n) >> 32));                         \
1188         *p++ = htonl((u32)(n));                                 \
1189 } while (0)
1190 #define WRITEMEM(ptr,nbytes)     do {                           \
1191         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1192         memcpy(p, ptr, nbytes);                                 \
1193         p += XDR_QUADLEN(nbytes);                               \
1194 } while (0)
1195 #define WRITECINFO(c)           do {                            \
1196         *p++ = htonl(c.atomic);                                 \
1197         *p++ = htonl(c.before_ctime_sec);                               \
1198         *p++ = htonl(c.before_ctime_nsec);                              \
1199         *p++ = htonl(c.after_ctime_sec);                                \
1200         *p++ = htonl(c.after_ctime_nsec);                               \
1201 } while (0)
1202
1203 #define RESERVE_SPACE(nbytes)   do {                            \
1204         p = resp->p;                                            \
1205         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1206 } while (0)
1207 #define ADJUST_ARGS()           resp->p = p
1208
1209 /*
1210  * Header routine to setup seqid operation replay cache
1211  */
1212 #define ENCODE_SEQID_OP_HEAD                                    \
1213         __be32 *p;                                              \
1214         __be32 *save;                                           \
1215                                                                 \
1216         save = resp->p;
1217
1218 /*
1219  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1220  * is where sequence id's are incremented, and the replay cache is filled.
1221  * Note that we increment sequence id's here, at the last moment, so we're sure
1222  * we know whether the error to be returned is a sequence id mutating error.
1223  */
1224
1225 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1226         if (seqid_mutating_err(nfserr) && stateowner) {         \
1227                 stateowner->so_seqid++;                         \
1228                 stateowner->so_replay.rp_status = nfserr;       \
1229                 stateowner->so_replay.rp_buflen =               \
1230                           (((char *)(resp)->p - (char *)save)); \
1231                 memcpy(stateowner->so_replay.rp_buf, save,      \
1232                         stateowner->so_replay.rp_buflen);       \
1233         } } while (0);
1234
1235 /* Encode as an array of strings the string given with components
1236  * seperated @sep.
1237  */
1238 static __be32 nfsd4_encode_components(char sep, char *components,
1239                                    __be32 **pp, int *buflen)
1240 {
1241         __be32 *p = *pp;
1242         __be32 *countp = p;
1243         int strlen, count=0;
1244         char *str, *end;
1245
1246         dprintk("nfsd4_encode_components(%s)\n", components);
1247         if ((*buflen -= 4) < 0)
1248                 return nfserr_resource;
1249         WRITE32(0); /* We will fill this in with @count later */
1250         end = str = components;
1251         while (*end) {
1252                 for (; *end && (*end != sep); end++)
1253                         ; /* Point to end of component */
1254                 strlen = end - str;
1255                 if (strlen) {
1256                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1257                                 return nfserr_resource;
1258                         WRITE32(strlen);
1259                         WRITEMEM(str, strlen);
1260                         count++;
1261                 }
1262                 else
1263                         end++;
1264                 str = end;
1265         }
1266         *pp = p;
1267         p = countp;
1268         WRITE32(count);
1269         return 0;
1270 }
1271
1272 /*
1273  * encode a location element of a fs_locations structure
1274  */
1275 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1276                                     __be32 **pp, int *buflen)
1277 {
1278         __be32 status;
1279         __be32 *p = *pp;
1280
1281         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1282         if (status)
1283                 return status;
1284         status = nfsd4_encode_components('/', location->path, &p, buflen);
1285         if (status)
1286                 return status;
1287         *pp = p;
1288         return 0;
1289 }
1290
1291 /*
1292  * Return the path to an export point in the pseudo filesystem namespace
1293  * Returned string is safe to use as long as the caller holds a reference
1294  * to @exp.
1295  */
1296 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1297 {
1298         struct svc_fh tmp_fh;
1299         char *path, *rootpath;
1300
1301         fh_init(&tmp_fh, NFS4_FHSIZE);
1302         *stat = exp_pseudoroot(rqstp->rq_client, &tmp_fh, &rqstp->rq_chandle);
1303         if (*stat)
1304                 return NULL;
1305         rootpath = tmp_fh.fh_export->ex_path;
1306
1307         path = exp->ex_path;
1308
1309         if (strncmp(path, rootpath, strlen(rootpath))) {
1310                 printk("nfsd: fs_locations failed;"
1311                         "%s is not contained in %s\n", path, rootpath);
1312                 *stat = nfserr_notsupp;
1313                 return NULL;
1314         }
1315
1316         return path + strlen(rootpath);
1317 }
1318
1319 /*
1320  *  encode a fs_locations structure
1321  */
1322 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1323                                      struct svc_export *exp,
1324                                      __be32 **pp, int *buflen)
1325 {
1326         __be32 status;
1327         int i;
1328         __be32 *p = *pp;
1329         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1330         char *root = nfsd4_path(rqstp, exp, &status);
1331
1332         if (status)
1333                 return status;
1334         status = nfsd4_encode_components('/', root, &p, buflen);
1335         if (status)
1336                 return status;
1337         if ((*buflen -= 4) < 0)
1338                 return nfserr_resource;
1339         WRITE32(fslocs->locations_count);
1340         for (i=0; i<fslocs->locations_count; i++) {
1341                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1342                                                    &p, buflen);
1343                 if (status)
1344                         return status;
1345         }
1346         *pp = p;
1347         return 0;
1348 }
1349
1350 static u32 nfs4_ftypes[16] = {
1351         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1352         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1353         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1354         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1355 };
1356
1357 static __be32
1358 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1359                         __be32 **p, int *buflen)
1360 {
1361         int status;
1362
1363         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1364                 return nfserr_resource;
1365         if (whotype != NFS4_ACL_WHO_NAMED)
1366                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1367         else if (group)
1368                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1369         else
1370                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1371         if (status < 0)
1372                 return nfserrno(status);
1373         *p = xdr_encode_opaque(*p, NULL, status);
1374         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1375         BUG_ON(*buflen < 0);
1376         return 0;
1377 }
1378
1379 static inline __be32
1380 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1381 {
1382         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1383 }
1384
1385 static inline __be32
1386 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1387 {
1388         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1389 }
1390
1391 static inline __be32
1392 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1393                 __be32 **p, int *buflen)
1394 {
1395         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1396 }
1397
1398 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1399                               FATTR4_WORD0_RDATTR_ERROR)
1400 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1401
1402 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1403 {
1404         /* As per referral draft:  */
1405         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1406             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1407                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1408                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1409                         *rdattr_err = NFSERR_MOVED;
1410                 else
1411                         return nfserr_moved;
1412         }
1413         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1414         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1415         return 0;
1416 }
1417
1418 /*
1419  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1420  * ourselves.
1421  *
1422  * @countp is the buffer size in _words_; upon successful return this becomes
1423  * replaced with the number of words written.
1424  */
1425 __be32
1426 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1427                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1428                 struct svc_rqst *rqstp)
1429 {
1430         u32 bmval0 = bmval[0];
1431         u32 bmval1 = bmval[1];
1432         struct kstat stat;
1433         struct svc_fh tempfh;
1434         struct kstatfs statfs;
1435         int buflen = *countp << 2;
1436         __be32 *attrlenp;
1437         u32 dummy;
1438         u64 dummy64;
1439         u32 rdattr_err = 0;
1440         __be32 *p = buffer;
1441         __be32 status;
1442         int err;
1443         int aclsupport = 0;
1444         struct nfs4_acl *acl = NULL;
1445
1446         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1447         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1448         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1449
1450         if (exp->ex_fslocs.migrated) {
1451                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1452                 if (status)
1453                         goto out;
1454         }
1455
1456         err = vfs_getattr(exp->ex_mnt, dentry, &stat);
1457         if (err)
1458                 goto out_nfserr;
1459         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1460             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1461                        FATTR4_WORD1_SPACE_TOTAL))) {
1462                 err = vfs_statfs(dentry, &statfs);
1463                 if (err)
1464                         goto out_nfserr;
1465         }
1466         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1467                 fh_init(&tempfh, NFS4_FHSIZE);
1468                 status = fh_compose(&tempfh, exp, dentry, NULL);
1469                 if (status)
1470                         goto out;
1471                 fhp = &tempfh;
1472         }
1473         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1474                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1475                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1476                 aclsupport = (err == 0);
1477                 if (bmval0 & FATTR4_WORD0_ACL) {
1478                         if (err == -EOPNOTSUPP)
1479                                 bmval0 &= ~FATTR4_WORD0_ACL;
1480                         else if (err == -EINVAL) {
1481                                 status = nfserr_attrnotsupp;
1482                                 goto out;
1483                         } else if (err != 0)
1484                                 goto out_nfserr;
1485                 }
1486         }
1487         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1488                 if (exp->ex_fslocs.locations == NULL) {
1489                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1490                 }
1491         }
1492         if ((buflen -= 16) < 0)
1493                 goto out_resource;
1494
1495         WRITE32(2);
1496         WRITE32(bmval0);
1497         WRITE32(bmval1);
1498         attrlenp = p++;                /* to be backfilled later */
1499
1500         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1501                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1502                 if ((buflen -= 12) < 0)
1503                         goto out_resource;
1504                 if (!aclsupport)
1505                         word0 &= ~FATTR4_WORD0_ACL;
1506                 if (!exp->ex_fslocs.locations)
1507                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1508                 WRITE32(2);
1509                 WRITE32(word0);
1510                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1511         }
1512         if (bmval0 & FATTR4_WORD0_TYPE) {
1513                 if ((buflen -= 4) < 0)
1514                         goto out_resource;
1515                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1516                 if (dummy == NF4BAD)
1517                         goto out_serverfault;
1518                 WRITE32(dummy);
1519         }
1520         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1521                 if ((buflen -= 4) < 0)
1522                         goto out_resource;
1523                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1524                         WRITE32(NFS4_FH_PERSISTENT);
1525                 else
1526                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1527         }
1528         if (bmval0 & FATTR4_WORD0_CHANGE) {
1529                 /*
1530                  * Note: This _must_ be consistent with the scheme for writing
1531                  * change_info, so any changes made here must be reflected there
1532                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1533                  * macro above.)
1534                  */
1535                 if ((buflen -= 8) < 0)
1536                         goto out_resource;
1537                 WRITE32(stat.ctime.tv_sec);
1538                 WRITE32(stat.ctime.tv_nsec);
1539         }
1540         if (bmval0 & FATTR4_WORD0_SIZE) {
1541                 if ((buflen -= 8) < 0)
1542                         goto out_resource;
1543                 WRITE64(stat.size);
1544         }
1545         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1546                 if ((buflen -= 4) < 0)
1547                         goto out_resource;
1548                 WRITE32(1);
1549         }
1550         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1551                 if ((buflen -= 4) < 0)
1552                         goto out_resource;
1553                 WRITE32(1);
1554         }
1555         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1556                 if ((buflen -= 4) < 0)
1557                         goto out_resource;
1558                 WRITE32(0);
1559         }
1560         if (bmval0 & FATTR4_WORD0_FSID) {
1561                 if ((buflen -= 16) < 0)
1562                         goto out_resource;
1563                 if (exp->ex_fslocs.migrated) {
1564                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1565                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1566                 } else if (is_fsid(fhp, rqstp->rq_reffh)) {
1567                         WRITE64((u64)exp->ex_fsid);
1568                         WRITE64((u64)0);
1569                 } else {
1570                         WRITE32(0);
1571                         WRITE32(MAJOR(stat.dev));
1572                         WRITE32(0);
1573                         WRITE32(MINOR(stat.dev));
1574                 }
1575         }
1576         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1577                 if ((buflen -= 4) < 0)
1578                         goto out_resource;
1579                 WRITE32(0);
1580         }
1581         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1582                 if ((buflen -= 4) < 0)
1583                         goto out_resource;
1584                 WRITE32(NFSD_LEASE_TIME);
1585         }
1586         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1587                 if ((buflen -= 4) < 0)
1588                         goto out_resource;
1589                 WRITE32(rdattr_err);
1590         }
1591         if (bmval0 & FATTR4_WORD0_ACL) {
1592                 struct nfs4_ace *ace;
1593                 struct list_head *h;
1594
1595                 if (acl == NULL) {
1596                         if ((buflen -= 4) < 0)
1597                                 goto out_resource;
1598
1599                         WRITE32(0);
1600                         goto out_acl;
1601                 }
1602                 if ((buflen -= 4) < 0)
1603                         goto out_resource;
1604                 WRITE32(acl->naces);
1605
1606                 list_for_each(h, &acl->ace_head) {
1607                         ace = list_entry(h, struct nfs4_ace, l_ace);
1608
1609                         if ((buflen -= 4*3) < 0)
1610                                 goto out_resource;
1611                         WRITE32(ace->type);
1612                         WRITE32(ace->flag);
1613                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1614                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1615                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1616                                 &p, &buflen);
1617                         if (status == nfserr_resource)
1618                                 goto out_resource;
1619                         if (status)
1620                                 goto out;
1621                 }
1622         }
1623 out_acl:
1624         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1625                 if ((buflen -= 4) < 0)
1626                         goto out_resource;
1627                 WRITE32(aclsupport ?
1628                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1629         }
1630         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1631                 if ((buflen -= 4) < 0)
1632                         goto out_resource;
1633                 WRITE32(1);
1634         }
1635         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1636                 if ((buflen -= 4) < 0)
1637                         goto out_resource;
1638                 WRITE32(1);
1639         }
1640         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1641                 if ((buflen -= 4) < 0)
1642                         goto out_resource;
1643                 WRITE32(1);
1644         }
1645         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1646                 if ((buflen -= 4) < 0)
1647                         goto out_resource;
1648                 WRITE32(1);
1649         }
1650         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1651                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1652                 if (buflen < 0)
1653                         goto out_resource;
1654                 WRITE32(fhp->fh_handle.fh_size);
1655                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1656         }
1657         if (bmval0 & FATTR4_WORD0_FILEID) {
1658                 if ((buflen -= 8) < 0)
1659                         goto out_resource;
1660                 WRITE64((u64) stat.ino);
1661         }
1662         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1663                 if ((buflen -= 8) < 0)
1664                         goto out_resource;
1665                 WRITE64((u64) statfs.f_ffree);
1666         }
1667         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1668                 if ((buflen -= 8) < 0)
1669                         goto out_resource;
1670                 WRITE64((u64) statfs.f_ffree);
1671         }
1672         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1673                 if ((buflen -= 8) < 0)
1674                         goto out_resource;
1675                 WRITE64((u64) statfs.f_files);
1676         }
1677         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1678                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1679                 if (status == nfserr_resource)
1680                         goto out_resource;
1681                 if (status)
1682                         goto out;
1683         }
1684         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1685                 if ((buflen -= 4) < 0)
1686                         goto out_resource;
1687                 WRITE32(1);
1688         }
1689         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1690                 if ((buflen -= 8) < 0)
1691                         goto out_resource;
1692                 WRITE64(~(u64)0);
1693         }
1694         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1695                 if ((buflen -= 4) < 0)
1696                         goto out_resource;
1697                 WRITE32(255);
1698         }
1699         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1700                 if ((buflen -= 4) < 0)
1701                         goto out_resource;
1702                 WRITE32(~(u32) 0);
1703         }
1704         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1705                 if ((buflen -= 8) < 0)
1706                         goto out_resource;
1707                 WRITE64((u64) svc_max_payload(rqstp));
1708         }
1709         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1710                 if ((buflen -= 8) < 0)
1711                         goto out_resource;
1712                 WRITE64((u64) svc_max_payload(rqstp));
1713         }
1714         if (bmval1 & FATTR4_WORD1_MODE) {
1715                 if ((buflen -= 4) < 0)
1716                         goto out_resource;
1717                 WRITE32(stat.mode & S_IALLUGO);
1718         }
1719         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1720                 if ((buflen -= 4) < 0)
1721                         goto out_resource;
1722                 WRITE32(1);
1723         }
1724         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1725                 if ((buflen -= 4) < 0)
1726                         goto out_resource;
1727                 WRITE32(stat.nlink);
1728         }
1729         if (bmval1 & FATTR4_WORD1_OWNER) {
1730                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1731                 if (status == nfserr_resource)
1732                         goto out_resource;
1733                 if (status)
1734                         goto out;
1735         }
1736         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1737                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1738                 if (status == nfserr_resource)
1739                         goto out_resource;
1740                 if (status)
1741                         goto out;
1742         }
1743         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1744                 if ((buflen -= 8) < 0)
1745                         goto out_resource;
1746                 WRITE32((u32) MAJOR(stat.rdev));
1747                 WRITE32((u32) MINOR(stat.rdev));
1748         }
1749         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1750                 if ((buflen -= 8) < 0)
1751                         goto out_resource;
1752                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1753                 WRITE64(dummy64);
1754         }
1755         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1756                 if ((buflen -= 8) < 0)
1757                         goto out_resource;
1758                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1759                 WRITE64(dummy64);
1760         }
1761         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1762                 if ((buflen -= 8) < 0)
1763                         goto out_resource;
1764                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1765                 WRITE64(dummy64);
1766         }
1767         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1768                 if ((buflen -= 8) < 0)
1769                         goto out_resource;
1770                 dummy64 = (u64)stat.blocks << 9;
1771                 WRITE64(dummy64);
1772         }
1773         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1774                 if ((buflen -= 12) < 0)
1775                         goto out_resource;
1776                 WRITE32(0);
1777                 WRITE32(stat.atime.tv_sec);
1778                 WRITE32(stat.atime.tv_nsec);
1779         }
1780         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1781                 if ((buflen -= 12) < 0)
1782                         goto out_resource;
1783                 WRITE32(0);
1784                 WRITE32(1);
1785                 WRITE32(0);
1786         }
1787         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1788                 if ((buflen -= 12) < 0)
1789                         goto out_resource;
1790                 WRITE32(0);
1791                 WRITE32(stat.ctime.tv_sec);
1792                 WRITE32(stat.ctime.tv_nsec);
1793         }
1794         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1795                 if ((buflen -= 12) < 0)
1796                         goto out_resource;
1797                 WRITE32(0);
1798                 WRITE32(stat.mtime.tv_sec);
1799                 WRITE32(stat.mtime.tv_nsec);
1800         }
1801         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1802                 struct dentry *mnt_pnt, *mnt_root;
1803
1804                 if ((buflen -= 8) < 0)
1805                         goto out_resource;
1806                 mnt_root = exp->ex_mnt->mnt_root;
1807                 if (mnt_root->d_inode == dentry->d_inode) {
1808                         mnt_pnt = exp->ex_mnt->mnt_mountpoint;
1809                         WRITE64((u64) mnt_pnt->d_inode->i_ino);
1810                 } else
1811                         WRITE64((u64) stat.ino);
1812         }
1813         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1814         *countp = p - buffer;
1815         status = nfs_ok;
1816
1817 out:
1818         nfs4_acl_free(acl);
1819         if (fhp == &tempfh)
1820                 fh_put(&tempfh);
1821         return status;
1822 out_nfserr:
1823         status = nfserrno(err);
1824         goto out;
1825 out_resource:
1826         *countp = 0;
1827         status = nfserr_resource;
1828         goto out;
1829 out_serverfault:
1830         status = nfserr_serverfault;
1831         goto out;
1832 }
1833
1834 static __be32
1835 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1836                 const char *name, int namlen, __be32 *p, int *buflen)
1837 {
1838         struct svc_export *exp = cd->rd_fhp->fh_export;
1839         struct dentry *dentry;
1840         __be32 nfserr;
1841
1842         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1843         if (IS_ERR(dentry))
1844                 return nfserrno(PTR_ERR(dentry));
1845
1846         exp_get(exp);
1847         if (d_mountpoint(dentry)) {
1848                 if (nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp)) {
1849                 /*
1850                  * -EAGAIN is the only error returned from
1851                  * nfsd_cross_mnt() and it indicates that an
1852                  * up-call has  been initiated to fill in the export
1853                  * options on exp.  When the answer comes back,
1854                  * this call will be retried.
1855                  */
1856                         nfserr = nfserr_dropit;
1857                         goto out_put;
1858                 }
1859
1860         }
1861         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1862                                         cd->rd_rqstp);
1863 out_put:
1864         dput(dentry);
1865         exp_put(exp);
1866         return nfserr;
1867 }
1868
1869 static __be32 *
1870 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1871 {
1872         __be32 *attrlenp;
1873
1874         if (buflen < 6)
1875                 return NULL;
1876         *p++ = htonl(2);
1877         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1878         *p++ = htonl(0);                         /* bmval1 */
1879
1880         attrlenp = p++;
1881         *p++ = nfserr;       /* no htonl */
1882         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1883         return p;
1884 }
1885
1886 static int
1887 nfsd4_encode_dirent(struct readdir_cd *ccd, const char *name, int namlen,
1888                     loff_t offset, ino_t ino, unsigned int d_type)
1889 {
1890         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1891         int buflen;
1892         __be32 *p = cd->buffer;
1893         __be32 nfserr = nfserr_toosmall;
1894
1895         /* In nfsv4, "." and ".." never make it onto the wire.. */
1896         if (name && isdotent(name, namlen)) {
1897                 cd->common.err = nfs_ok;
1898                 return 0;
1899         }
1900
1901         if (cd->offset)
1902                 xdr_encode_hyper(cd->offset, (u64) offset);
1903
1904         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1905         if (buflen < 0)
1906                 goto fail;
1907
1908         *p++ = xdr_one;                             /* mark entry present */
1909         cd->offset = p;                             /* remember pointer */
1910         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1911         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1912
1913         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1914         switch (nfserr) {
1915         case nfs_ok:
1916                 p += buflen;
1917                 break;
1918         case nfserr_resource:
1919                 nfserr = nfserr_toosmall;
1920                 goto fail;
1921         case nfserr_dropit:
1922                 goto fail;
1923         default:
1924                 /*
1925                  * If the client requested the RDATTR_ERROR attribute,
1926                  * we stuff the error code into this attribute
1927                  * and continue.  If this attribute was not requested,
1928                  * then in accordance with the spec, we fail the
1929                  * entire READDIR operation(!)
1930                  */
1931                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1932                         goto fail;
1933                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1934                 if (p == NULL) {
1935                         nfserr = nfserr_toosmall;
1936                         goto fail;
1937                 }
1938         }
1939         cd->buflen -= (p - cd->buffer);
1940         cd->buffer = p;
1941         cd->common.err = nfs_ok;
1942         return 0;
1943 fail:
1944         cd->common.err = nfserr;
1945         return -EINVAL;
1946 }
1947
1948 static void
1949 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1950 {
1951         ENCODE_HEAD;
1952
1953         if (!nfserr) {
1954                 RESERVE_SPACE(8);
1955                 WRITE32(access->ac_supported);
1956                 WRITE32(access->ac_resp_access);
1957                 ADJUST_ARGS();
1958         }
1959 }
1960
1961 static void
1962 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1963 {
1964         ENCODE_SEQID_OP_HEAD;
1965
1966         if (!nfserr) {
1967                 RESERVE_SPACE(sizeof(stateid_t));
1968                 WRITE32(close->cl_stateid.si_generation);
1969                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1970                 ADJUST_ARGS();
1971         }
1972         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1973 }
1974
1975
1976 static void
1977 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
1978 {
1979         ENCODE_HEAD;
1980
1981         if (!nfserr) {
1982                 RESERVE_SPACE(8);
1983                 WRITEMEM(commit->co_verf.data, 8);
1984                 ADJUST_ARGS();
1985         }
1986 }
1987
1988 static void
1989 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
1990 {
1991         ENCODE_HEAD;
1992
1993         if (!nfserr) {
1994                 RESERVE_SPACE(32);
1995                 WRITECINFO(create->cr_cinfo);
1996                 WRITE32(2);
1997                 WRITE32(create->cr_bmval[0]);
1998                 WRITE32(create->cr_bmval[1]);
1999                 ADJUST_ARGS();
2000         }
2001 }
2002
2003 static __be32
2004 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2005 {
2006         struct svc_fh *fhp = getattr->ga_fhp;
2007         int buflen;
2008
2009         if (nfserr)
2010                 return nfserr;
2011
2012         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2013         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2014                                     resp->p, &buflen, getattr->ga_bmval,
2015                                     resp->rqstp);
2016         if (!nfserr)
2017                 resp->p += buflen;
2018         return nfserr;
2019 }
2020
2021 static void
2022 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh *fhp)
2023 {
2024         unsigned int len;
2025         ENCODE_HEAD;
2026
2027         if (!nfserr) {
2028                 len = fhp->fh_handle.fh_size;
2029                 RESERVE_SPACE(len + 4);
2030                 WRITE32(len);
2031                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2032                 ADJUST_ARGS();
2033         }
2034 }
2035
2036 /*
2037 * Including all fields other than the name, a LOCK4denied structure requires
2038 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2039 */
2040 static void
2041 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2042 {
2043         ENCODE_HEAD;
2044
2045         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2046         WRITE64(ld->ld_start);
2047         WRITE64(ld->ld_length);
2048         WRITE32(ld->ld_type);
2049         if (ld->ld_sop) {
2050                 WRITEMEM(&ld->ld_clientid, 8);
2051                 WRITE32(ld->ld_sop->so_owner.len);
2052                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2053                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2054         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2055                 WRITE64((u64)0); /* clientid */
2056                 WRITE32(0); /* length of owner name */
2057         }
2058         ADJUST_ARGS();
2059 }
2060
2061 static void
2062 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2063 {
2064         ENCODE_SEQID_OP_HEAD;
2065
2066         if (!nfserr) {
2067                 RESERVE_SPACE(4 + sizeof(stateid_t));
2068                 WRITE32(lock->lk_resp_stateid.si_generation);
2069                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2070                 ADJUST_ARGS();
2071         } else if (nfserr == nfserr_denied)
2072                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2073
2074         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2075 }
2076
2077 static void
2078 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2079 {
2080         if (nfserr == nfserr_denied)
2081                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2082 }
2083
2084 static void
2085 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2086 {
2087         ENCODE_SEQID_OP_HEAD;
2088
2089         if (!nfserr) {
2090                 RESERVE_SPACE(sizeof(stateid_t));
2091                 WRITE32(locku->lu_stateid.si_generation);
2092                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2093                 ADJUST_ARGS();
2094         }
2095
2096         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2097 }
2098
2099
2100 static void
2101 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2102 {
2103         ENCODE_HEAD;
2104
2105         if (!nfserr) {
2106                 RESERVE_SPACE(20);
2107                 WRITECINFO(link->li_cinfo);
2108                 ADJUST_ARGS();
2109         }
2110 }
2111
2112
2113 static void
2114 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2115 {
2116         ENCODE_SEQID_OP_HEAD;
2117
2118         if (nfserr)
2119                 goto out;
2120
2121         RESERVE_SPACE(36 + sizeof(stateid_t));
2122         WRITE32(open->op_stateid.si_generation);
2123         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2124         WRITECINFO(open->op_cinfo);
2125         WRITE32(open->op_rflags);
2126         WRITE32(2);
2127         WRITE32(open->op_bmval[0]);
2128         WRITE32(open->op_bmval[1]);
2129         WRITE32(open->op_delegate_type);
2130         ADJUST_ARGS();
2131
2132         switch (open->op_delegate_type) {
2133         case NFS4_OPEN_DELEGATE_NONE:
2134                 break;
2135         case NFS4_OPEN_DELEGATE_READ:
2136                 RESERVE_SPACE(20 + sizeof(stateid_t));
2137                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2138                 WRITE32(open->op_recall);
2139
2140                 /*
2141                  * TODO: ACE's in delegations
2142                  */
2143                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2144                 WRITE32(0);
2145                 WRITE32(0);
2146                 WRITE32(0);   /* XXX: is NULL principal ok? */
2147                 ADJUST_ARGS();
2148                 break;
2149         case NFS4_OPEN_DELEGATE_WRITE:
2150                 RESERVE_SPACE(32 + sizeof(stateid_t));
2151                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2152                 WRITE32(0);
2153
2154                 /*
2155                  * TODO: space_limit's in delegations
2156                  */
2157                 WRITE32(NFS4_LIMIT_SIZE);
2158                 WRITE32(~(u32)0);
2159                 WRITE32(~(u32)0);
2160
2161                 /*
2162                  * TODO: ACE's in delegations
2163                  */
2164                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2165                 WRITE32(0);
2166                 WRITE32(0);
2167                 WRITE32(0);   /* XXX: is NULL principal ok? */
2168                 ADJUST_ARGS();
2169                 break;
2170         default:
2171                 BUG();
2172         }
2173         /* XXX save filehandle here */
2174 out:
2175         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2176 }
2177
2178 static void
2179 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2180 {
2181         ENCODE_SEQID_OP_HEAD;
2182
2183         if (!nfserr) {
2184                 RESERVE_SPACE(sizeof(stateid_t));
2185                 WRITE32(oc->oc_resp_stateid.si_generation);
2186                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2187                 ADJUST_ARGS();
2188         }
2189
2190         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2191 }
2192
2193 static void
2194 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2195 {
2196         ENCODE_SEQID_OP_HEAD;
2197
2198         if (!nfserr) {
2199                 RESERVE_SPACE(sizeof(stateid_t));
2200                 WRITE32(od->od_stateid.si_generation);
2201                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2202                 ADJUST_ARGS();
2203         }
2204
2205         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2206 }
2207
2208 static __be32
2209 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2210                   struct nfsd4_read *read)
2211 {
2212         u32 eof;
2213         int v, pn;
2214         unsigned long maxcount;
2215         long len;
2216         ENCODE_HEAD;
2217
2218         if (nfserr)
2219                 return nfserr;
2220         if (resp->xbuf->page_len)
2221                 return nfserr_resource;
2222
2223         RESERVE_SPACE(8); /* eof flag and byte count */
2224
2225         maxcount = svc_max_payload(resp->rqstp);
2226         if (maxcount > read->rd_length)
2227                 maxcount = read->rd_length;
2228
2229         len = maxcount;
2230         v = 0;
2231         while (len > 0) {
2232                 pn = resp->rqstp->rq_resused++;
2233                 resp->rqstp->rq_vec[v].iov_base =
2234                         page_address(resp->rqstp->rq_respages[pn]);
2235                 resp->rqstp->rq_vec[v].iov_len =
2236                         len < PAGE_SIZE ? len : PAGE_SIZE;
2237                 v++;
2238                 len -= PAGE_SIZE;
2239         }
2240         read->rd_vlen = v;
2241
2242         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2243                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2244                         &maxcount);
2245
2246         if (nfserr == nfserr_symlink)
2247                 nfserr = nfserr_inval;
2248         if (nfserr)
2249                 return nfserr;
2250         eof = (read->rd_offset + maxcount >=
2251                read->rd_fhp->fh_dentry->d_inode->i_size);
2252
2253         WRITE32(eof);
2254         WRITE32(maxcount);
2255         ADJUST_ARGS();
2256         resp->xbuf->head[0].iov_len = (char*)p
2257                                         - (char*)resp->xbuf->head[0].iov_base;
2258         resp->xbuf->page_len = maxcount;
2259
2260         /* Use rest of head for padding and remaining ops: */
2261         resp->xbuf->tail[0].iov_base = p;
2262         resp->xbuf->tail[0].iov_len = 0;
2263         if (maxcount&3) {
2264                 RESERVE_SPACE(4);
2265                 WRITE32(0);
2266                 resp->xbuf->tail[0].iov_base += maxcount&3;
2267                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2268                 ADJUST_ARGS();
2269         }
2270         return 0;
2271 }
2272
2273 static __be32
2274 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2275 {
2276         int maxcount;
2277         char *page;
2278         ENCODE_HEAD;
2279
2280         if (nfserr)
2281                 return nfserr;
2282         if (resp->xbuf->page_len)
2283                 return nfserr_resource;
2284
2285         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2286
2287         maxcount = PAGE_SIZE;
2288         RESERVE_SPACE(4);
2289
2290         /*
2291          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2292          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2293          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2294          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2295          */
2296         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2297         if (nfserr == nfserr_isdir)
2298                 return nfserr_inval;
2299         if (nfserr)
2300                 return nfserr;
2301
2302         WRITE32(maxcount);
2303         ADJUST_ARGS();
2304         resp->xbuf->head[0].iov_len = (char*)p
2305                                 - (char*)resp->xbuf->head[0].iov_base;
2306         resp->xbuf->page_len = maxcount;
2307
2308         /* Use rest of head for padding and remaining ops: */
2309         resp->xbuf->tail[0].iov_base = p;
2310         resp->xbuf->tail[0].iov_len = 0;
2311         if (maxcount&3) {
2312                 RESERVE_SPACE(4);
2313                 WRITE32(0);
2314                 resp->xbuf->tail[0].iov_base += maxcount&3;
2315                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2316                 ADJUST_ARGS();
2317         }
2318         return 0;
2319 }
2320
2321 static __be32
2322 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2323 {
2324         int maxcount;
2325         loff_t offset;
2326         __be32 *page, *savep, *tailbase;
2327         ENCODE_HEAD;
2328
2329         if (nfserr)
2330                 return nfserr;
2331         if (resp->xbuf->page_len)
2332                 return nfserr_resource;
2333
2334         RESERVE_SPACE(8);  /* verifier */
2335         savep = p;
2336
2337         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2338         WRITE32(0);
2339         WRITE32(0);
2340         ADJUST_ARGS();
2341         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2342         tailbase = p;
2343
2344         maxcount = PAGE_SIZE;
2345         if (maxcount > readdir->rd_maxcount)
2346                 maxcount = readdir->rd_maxcount;
2347
2348         /*
2349          * Convert from bytes to words, account for the two words already
2350          * written, make sure to leave two words at the end for the next
2351          * pointer and eof field.
2352          */
2353         maxcount = (maxcount >> 2) - 4;
2354         if (maxcount < 0) {
2355                 nfserr =  nfserr_toosmall;
2356                 goto err_no_verf;
2357         }
2358
2359         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2360         readdir->common.err = 0;
2361         readdir->buflen = maxcount;
2362         readdir->buffer = page;
2363         readdir->offset = NULL;
2364
2365         offset = readdir->rd_cookie;
2366         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2367                               &offset,
2368                               &readdir->common, nfsd4_encode_dirent);
2369         if (nfserr == nfs_ok &&
2370             readdir->common.err == nfserr_toosmall &&
2371             readdir->buffer == page)
2372                 nfserr = nfserr_toosmall;
2373         if (nfserr == nfserr_symlink)
2374                 nfserr = nfserr_notdir;
2375         if (nfserr)
2376                 goto err_no_verf;
2377
2378         if (readdir->offset)
2379                 xdr_encode_hyper(readdir->offset, offset);
2380
2381         p = readdir->buffer;
2382         *p++ = 0;       /* no more entries */
2383         *p++ = htonl(readdir->common.err == nfserr_eof);
2384         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2385                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2386
2387         /* Use rest of head for padding and remaining ops: */
2388         resp->xbuf->tail[0].iov_base = tailbase;
2389         resp->xbuf->tail[0].iov_len = 0;
2390         resp->p = resp->xbuf->tail[0].iov_base;
2391         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2392
2393         return 0;
2394 err_no_verf:
2395         p = savep;
2396         ADJUST_ARGS();
2397         return nfserr;
2398 }
2399
2400 static void
2401 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2402 {
2403         ENCODE_HEAD;
2404
2405         if (!nfserr) {
2406                 RESERVE_SPACE(20);
2407                 WRITECINFO(remove->rm_cinfo);
2408                 ADJUST_ARGS();
2409         }
2410 }
2411
2412 static void
2413 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2414 {
2415         ENCODE_HEAD;
2416
2417         if (!nfserr) {
2418                 RESERVE_SPACE(40);
2419                 WRITECINFO(rename->rn_sinfo);
2420                 WRITECINFO(rename->rn_tinfo);
2421                 ADJUST_ARGS();
2422         }
2423 }
2424
2425 /*
2426  * The SETATTR encode routine is special -- it always encodes a bitmap,
2427  * regardless of the error status.
2428  */
2429 static void
2430 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2431 {
2432         ENCODE_HEAD;
2433
2434         RESERVE_SPACE(12);
2435         if (nfserr) {
2436                 WRITE32(2);
2437                 WRITE32(0);
2438                 WRITE32(0);
2439         }
2440         else {
2441                 WRITE32(2);
2442                 WRITE32(setattr->sa_bmval[0]);
2443                 WRITE32(setattr->sa_bmval[1]);
2444         }
2445         ADJUST_ARGS();
2446 }
2447
2448 static void
2449 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2450 {
2451         ENCODE_HEAD;
2452
2453         if (!nfserr) {
2454                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2455                 WRITEMEM(&scd->se_clientid, 8);
2456                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2457                 ADJUST_ARGS();
2458         }
2459         else if (nfserr == nfserr_clid_inuse) {
2460                 RESERVE_SPACE(8);
2461                 WRITE32(0);
2462                 WRITE32(0);
2463                 ADJUST_ARGS();
2464         }
2465 }
2466
2467 static void
2468 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2469 {
2470         ENCODE_HEAD;
2471
2472         if (!nfserr) {
2473                 RESERVE_SPACE(16);
2474                 WRITE32(write->wr_bytes_written);
2475                 WRITE32(write->wr_how_written);
2476                 WRITEMEM(write->wr_verifier.data, 8);
2477                 ADJUST_ARGS();
2478         }
2479 }
2480
2481 void
2482 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2483 {
2484         __be32 *statp;
2485         ENCODE_HEAD;
2486
2487         RESERVE_SPACE(8);
2488         WRITE32(op->opnum);
2489         statp = p++;    /* to be backfilled at the end */
2490         ADJUST_ARGS();
2491
2492         switch (op->opnum) {
2493         case OP_ACCESS:
2494                 nfsd4_encode_access(resp, op->status, &op->u.access);
2495                 break;
2496         case OP_CLOSE:
2497                 nfsd4_encode_close(resp, op->status, &op->u.close);
2498                 break;
2499         case OP_COMMIT:
2500                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2501                 break;
2502         case OP_CREATE:
2503                 nfsd4_encode_create(resp, op->status, &op->u.create);
2504                 break;
2505         case OP_DELEGRETURN:
2506                 break;
2507         case OP_GETATTR:
2508                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2509                 break;
2510         case OP_GETFH:
2511                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2512                 break;
2513         case OP_LINK:
2514                 nfsd4_encode_link(resp, op->status, &op->u.link);
2515                 break;
2516         case OP_LOCK:
2517                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2518                 break;
2519         case OP_LOCKT:
2520                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2521                 break;
2522         case OP_LOCKU:
2523                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2524                 break;
2525         case OP_LOOKUP:
2526                 break;
2527         case OP_LOOKUPP:
2528                 break;
2529         case OP_NVERIFY:
2530                 break;
2531         case OP_OPEN:
2532                 nfsd4_encode_open(resp, op->status, &op->u.open);
2533                 break;
2534         case OP_OPEN_CONFIRM:
2535                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2536                 break;
2537         case OP_OPEN_DOWNGRADE:
2538                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2539                 break;
2540         case OP_PUTFH:
2541                 break;
2542         case OP_PUTROOTFH:
2543                 break;
2544         case OP_READ:
2545                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2546                 break;
2547         case OP_READDIR:
2548                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2549                 break;
2550         case OP_READLINK:
2551                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2552                 break;
2553         case OP_REMOVE:
2554                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2555                 break;
2556         case OP_RENAME:
2557                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2558                 break;
2559         case OP_RENEW:
2560                 break;
2561         case OP_RESTOREFH:
2562                 break;
2563         case OP_SAVEFH:
2564                 break;
2565         case OP_SETATTR:
2566                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2567                 break;
2568         case OP_SETCLIENTID:
2569                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2570                 break;
2571         case OP_SETCLIENTID_CONFIRM:
2572                 break;
2573         case OP_VERIFY:
2574                 break;
2575         case OP_WRITE:
2576                 nfsd4_encode_write(resp, op->status, &op->u.write);
2577                 break;
2578         case OP_RELEASE_LOCKOWNER:
2579                 break;
2580         default:
2581                 break;
2582         }
2583
2584         /*
2585          * Note: We write the status directly, instead of using WRITE32(),
2586          * since it is already in network byte order.
2587          */
2588         *statp = op->status;
2589 }
2590
2591 /*
2592  * Encode the reply stored in the stateowner reply cache
2593  *
2594  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2595  * previously sent already encoded operation.
2596  *
2597  * called with nfs4_lock_state() held
2598  */
2599 void
2600 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2601 {
2602         ENCODE_HEAD;
2603         struct nfs4_replay *rp = op->replay;
2604
2605         BUG_ON(!rp);
2606
2607         RESERVE_SPACE(8);
2608         WRITE32(op->opnum);
2609         *p++ = rp->rp_status;  /* already xdr'ed */
2610         ADJUST_ARGS();
2611
2612         RESERVE_SPACE(rp->rp_buflen);
2613         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2614         ADJUST_ARGS();
2615 }
2616
2617 /*
2618  * END OF "GENERIC" ENCODE ROUTINES.
2619  */
2620
2621 int
2622 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2623 {
2624         return xdr_ressize_check(rqstp, p);
2625 }
2626
2627 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2628 {
2629         if (args->ops != args->iops) {
2630                 kfree(args->ops);
2631                 args->ops = args->iops;
2632         }
2633         kfree(args->tmpp);
2634         args->tmpp = NULL;
2635         while (args->to_free) {
2636                 struct tmpbuf *tb = args->to_free;
2637                 args->to_free = tb->next;
2638                 tb->release(tb->buf);
2639                 kfree(tb);
2640         }
2641 }
2642
2643 int
2644 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2645 {
2646         __be32 status;
2647
2648         args->p = p;
2649         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2650         args->pagelist = rqstp->rq_arg.pages;
2651         args->pagelen = rqstp->rq_arg.page_len;
2652         args->tmpp = NULL;
2653         args->to_free = NULL;
2654         args->ops = args->iops;
2655         args->rqstp = rqstp;
2656
2657         status = nfsd4_decode_compound(args);
2658         if (status) {
2659                 nfsd4_release_compoundargs(args);
2660         }
2661         return !status;
2662 }
2663
2664 int
2665 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2666 {
2667         /*
2668          * All that remains is to write the tag and operation count...
2669          */
2670         struct kvec *iov;
2671         p = resp->tagp;
2672         *p++ = htonl(resp->taglen);
2673         memcpy(p, resp->tag, resp->taglen);
2674         p += XDR_QUADLEN(resp->taglen);
2675         *p++ = htonl(resp->opcnt);
2676
2677         if (rqstp->rq_res.page_len)
2678                 iov = &rqstp->rq_res.tail[0];
2679         else
2680                 iov = &rqstp->rq_res.head[0];
2681         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2682         BUG_ON(iov->iov_len > PAGE_SIZE);
2683         return 1;
2684 }
2685
2686 /*
2687  * Local variables:
2688  *  c-basic-offset: 8
2689  * End:
2690  */