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