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   1 /*
   2  *  fs/nfs/nfs4xdr.c
   3  *
   4  *  Server-side XDR for NFSv4
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * TODO: Neil Brown made the following observation:  We currently
  38  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  39  * never release any of that until the request is complete.
  40  * It would be good to calculate a new maximum response size while
  41  * decoding the COMPOUND, and call svc_reserve with this number
  42  * at the end of nfs4svc_decode_compoundargs.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/smp.h>
  47 #include <linux/fs.h>
  48 #include <linux/namei.h>
  49 #include <linux/vfs.h>
  50 #include <linux/sunrpc/xdr.h>
  51 #include <linux/sunrpc/svc.h>
  52 #include <linux/sunrpc/clnt.h>
  53 #include <linux/nfsd/nfsd.h>
  54 #include <linux/nfsd/state.h>
  55 #include <linux/nfsd/xdr4.h>
  56 #include <linux/nfsd_idmap.h>
  57 #include <linux/nfs4.h>
  58 #include <linux/nfs4_acl.h>
  59 #include <linux/sunrpc/gss_api.h>
  60
  61 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  62
  63 /*
  64  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  65  * directory in order to indicate to the client that a filesystem boundary is present
  66  * We use a fixed fsid for a referral
  67  */
  68 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  69 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  70
  71 static __be32
  72 check_filename(char *str, int len, __be32 err)
  73 {
  74         int i;
  75
  76         if (len == 0)
  77                 return nfserr_inval;
  78         if (isdotent(str, len))
  79                 return err;
  80         for (i = 0; i < len; i++)
  81                 if (str[i] == '/')
  82                         return err;
  83         return 0;
  84 }
  85
  86 /*
  87  * START OF "GENERIC" DECODE ROUTINES.
  88  *   These may look a little ugly since they are imported from a "generic"
  89  * set of XDR encode/decode routines which are intended to be shared by
  90  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  91  *
  92  * If the pain of reading these is too great, it should be a straightforward
  93  * task to translate them into Linux-specific versions which are more
  94  * consistent with the style used in NFSv2/v3...
  95  */
  96 #define DECODE_HEAD                             \
  97         __be32 *p;                              \
  98         __be32 status
  99 #define DECODE_TAIL                             \
 100         status = 0;                             \
 101 out:                                            \
 102         return status;                          \
 103 xdr_error:                                      \
 104         printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 105         status = nfserr_bad_xdr;                \
 106         goto out
 107
 108 #define READ32(x)         (x) = ntohl(*p++)
 109 #define READ64(x)         do {                  \
 110         (x) = (u64)ntohl(*p++) << 32;           \
 111         (x) |= ntohl(*p++);                     \
 112 } while (0)
 113 #define READTIME(x)       do {                  \
 114         p++;                                    \
 115         (x) = ntohl(*p++);                      \
 116         p++;                                    \
 117 } while (0)
 118 #define READMEM(x,nbytes) do {                  \
 119         x = (char *)p;                          \
 120         p += XDR_QUADLEN(nbytes);               \
 121 } while (0)
 122 #define SAVEMEM(x,nbytes) do {                  \
 123         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 124                 savemem(argp, p, nbytes) :      \
 125                 (char *)p)) {                   \
 126                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 127                 goto xdr_error;                 \
 128                 }                               \
 129         p += XDR_QUADLEN(nbytes);               \
 130 } while (0)
 131 #define COPYMEM(x,nbytes) do {                  \
 132         memcpy((x), p, nbytes);                 \
 133         p += XDR_QUADLEN(nbytes);               \
 134 } while (0)
 135
 136 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 137 #define READ_BUF(nbytes)  do {                  \
 138         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 139                 p = argp->p;                    \
 140                 argp->p += XDR_QUADLEN(nbytes); \
 141         } else if (!(p = read_buf(argp, nbytes))) { \
 142                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 143                 goto xdr_error;                 \
 144         }                                       \
 145 } while (0)
 146
 147 static __be32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
 148 {
 149         /* We want more bytes than seem to be available.
 150          * Maybe we need a new page, maybe we have just run out
 151          */
 152         int avail = (char*)argp->end - (char*)argp->p;
 153         __be32 *p;
 154         if (avail + argp->pagelen < nbytes)
 155                 return NULL;
 156         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 157                 return NULL;
 158         /* ok, we can do it with the current plus the next page */
 159         if (nbytes <= sizeof(argp->tmp))
 160                 p = argp->tmp;
 161         else {
 162                 kfree(argp->tmpp);
 163                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 164                 if (!p)
 165                         return NULL;
 166
 167         }
 168         memcpy(p, argp->p, avail);
 169         /* step to next page */
 170         argp->p = page_address(argp->pagelist[0]);
 171         argp->pagelist++;
 172         if (argp->pagelen < PAGE_SIZE) {
 173                 argp->end = p + (argp->pagelen>>2);
 174                 argp->pagelen = 0;
 175         } else {
 176                 argp->end = p + (PAGE_SIZE>>2);
 177                 argp->pagelen -= PAGE_SIZE;
 178         }
 179         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 180         argp->p += XDR_QUADLEN(nbytes - avail);
 181         return p;
 182 }
 183
 184 static int
 185 defer_free(struct nfsd4_compoundargs *argp,
 186                 void (*release)(const void *), void *p)
 187 {
 188         struct tmpbuf *tb;
 189
 190         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 191         if (!tb)
 192                 return -ENOMEM;
 193         tb->buf = p;
 194         tb->release = release;
 195         tb->next = argp->to_free;
 196         argp->to_free = tb;
 197         return 0;
 198 }
 199
 200 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 201 {
 202         if (p == argp->tmp) {
 203                 p = kmalloc(nbytes, GFP_KERNEL);
 204                 if (!p)
 205                         return NULL;
 206                 memcpy(p, argp->tmp, nbytes);
 207         } else {
 208                 BUG_ON(p != argp->tmpp);
 209                 argp->tmpp = NULL;
 210         }
 211         if (defer_free(argp, kfree, p)) {
 212                 kfree(p);
 213                 return NULL;
 214         } else
 215                 return (char *)p;
 216 }
 217
 218 static __be32
 219 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 220 {
 221         u32 bmlen;
 222         DECODE_HEAD;
 223
 224         bmval[0] = 0;
 225         bmval[1] = 0;
 226
 227         READ_BUF(4);
 228         READ32(bmlen);
 229         if (bmlen > 1000)
 230                 goto xdr_error;
 231
 232         READ_BUF(bmlen << 2);
 233         if (bmlen > 0)
 234                 READ32(bmval[0]);
 235         if (bmlen > 1)
 236                 READ32(bmval[1]);
 237
 238         DECODE_TAIL;
 239 }
 240
 241 static __be32
 242 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 243     struct nfs4_acl **acl)
 244 {
 245         int expected_len, len = 0;
 246         u32 dummy32;
 247         char *buf;
 248         int host_err;
 249
 250         DECODE_HEAD;
 251         iattr->ia_valid = 0;
 252         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 253                 return status;
 254
 255         /*
 256          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
 257          * read-only attributes return ERR_INVAL.
 258          */
 259         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 260                 return nfserr_attrnotsupp;
 261         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 262                 return nfserr_inval;
 263
 264         READ_BUF(4);
 265         READ32(expected_len);
 266
 267         if (bmval[0] & FATTR4_WORD0_SIZE) {
 268                 READ_BUF(8);
 269                 len += 8;
 270                 READ64(iattr->ia_size);
 271                 iattr->ia_valid |= ATTR_SIZE;
 272         }
 273         if (bmval[0] & FATTR4_WORD0_ACL) {
 274                 int nace;
 275                 struct nfs4_ace *ace;
 276
 277                 READ_BUF(4); len += 4;
 278                 READ32(nace);
 279
 280                 if (nace > NFS4_ACL_MAX)
 281                         return nfserr_resource;
 282
 283                 *acl = nfs4_acl_new(nace);
 284                 if (*acl == NULL) {
 285                         host_err = -ENOMEM;
 286                         goto out_nfserr;
 287                 }
 288                 defer_free(argp, kfree, *acl);
 289
 290                 (*acl)->naces = nace;
 291                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 292                         READ_BUF(16); len += 16;
 293                         READ32(ace->type);
 294                         READ32(ace->flag);
 295                         READ32(ace->access_mask);
 296                         READ32(dummy32);
 297                         READ_BUF(dummy32);
 298                         len += XDR_QUADLEN(dummy32) << 2;
 299                         READMEM(buf, dummy32);
 300                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 301                         host_err = 0;
 302                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 303                                 ace->who = 0;
 304                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 305                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 306                                                 buf, dummy32, &ace->who);
 307                         else
 308                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 309                                                 buf, dummy32, &ace->who);
 310                         if (host_err)
 311                                 goto out_nfserr;
 312                 }
 313         } else
 314                 *acl = NULL;
 315         if (bmval[1] & FATTR4_WORD1_MODE) {
 316                 READ_BUF(4);
 317                 len += 4;
 318                 READ32(iattr->ia_mode);
 319                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 320                 iattr->ia_valid |= ATTR_MODE;
 321         }
 322         if (bmval[1] & FATTR4_WORD1_OWNER) {
 323                 READ_BUF(4);
 324                 len += 4;
 325                 READ32(dummy32);
 326                 READ_BUF(dummy32);
 327                 len += (XDR_QUADLEN(dummy32) << 2);
 328                 READMEM(buf, dummy32);
 329                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 330                         goto out_nfserr;
 331                 iattr->ia_valid |= ATTR_UID;
 332         }
 333         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 334                 READ_BUF(4);
 335                 len += 4;
 336                 READ32(dummy32);
 337                 READ_BUF(dummy32);
 338                 len += (XDR_QUADLEN(dummy32) << 2);
 339                 READMEM(buf, dummy32);
 340                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 341                         goto out_nfserr;
 342                 iattr->ia_valid |= ATTR_GID;
 343         }
 344         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 345                 READ_BUF(4);
 346                 len += 4;
 347                 READ32(dummy32);
 348                 switch (dummy32) {
 349                 case NFS4_SET_TO_CLIENT_TIME:
 350                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 351                            all 32 bits of 'nseconds'. */
 352                         READ_BUF(12);
 353                         len += 12;
 354                         READ32(dummy32);
 355                         if (dummy32)
 356                                 return nfserr_inval;
 357                         READ32(iattr->ia_atime.tv_sec);
 358                         READ32(iattr->ia_atime.tv_nsec);
 359                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 360                                 return nfserr_inval;
 361                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 362                         break;
 363                 case NFS4_SET_TO_SERVER_TIME:
 364                         iattr->ia_valid |= ATTR_ATIME;
 365                         break;
 366                 default:
 367                         goto xdr_error;
 368                 }
 369         }
 370         if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
 371                 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 372                    all 32 bits of 'nseconds'. */
 373                 READ_BUF(12);
 374                 len += 12;
 375                 READ32(dummy32);
 376                 if (dummy32)
 377                         return nfserr_inval;
 378                 READ32(iattr->ia_ctime.tv_sec);
 379                 READ32(iattr->ia_ctime.tv_nsec);
 380                 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
 381                         return nfserr_inval;
 382                 iattr->ia_valid |= ATTR_CTIME;
 383         }
 384         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 385                 READ_BUF(4);
 386                 len += 4;
 387                 READ32(dummy32);
 388                 switch (dummy32) {
 389                 case NFS4_SET_TO_CLIENT_TIME:
 390                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 391                            all 32 bits of 'nseconds'. */
 392                         READ_BUF(12);
 393                         len += 12;
 394                         READ32(dummy32);
 395                         if (dummy32)
 396                                 return nfserr_inval;
 397                         READ32(iattr->ia_mtime.tv_sec);
 398                         READ32(iattr->ia_mtime.tv_nsec);
 399                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 400                                 return nfserr_inval;
 401                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 402                         break;
 403                 case NFS4_SET_TO_SERVER_TIME:
 404                         iattr->ia_valid |= ATTR_MTIME;
 405                         break;
 406                 default:
 407                         goto xdr_error;
 408                 }
 409         }
 410         if (len != expected_len)
 411                 goto xdr_error;
 412
 413         DECODE_TAIL;
 414
 415 out_nfserr:
 416         status = nfserrno(host_err);
 417         goto out;
 418 }
 419
 420 static __be32
 421 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 422 {
 423         DECODE_HEAD;
 424
 425         READ_BUF(4);
 426         READ32(access->ac_req_access);
 427
 428         DECODE_TAIL;
 429 }
 430
 431 static __be32
 432 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 433 {
 434         DECODE_HEAD;
 435
 436         close->cl_stateowner = NULL;
 437         READ_BUF(4 + sizeof(stateid_t));
 438         READ32(close->cl_seqid);
 439         READ32(close->cl_stateid.si_generation);
 440         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
 441
 442         DECODE_TAIL;
 443 }
 444
 445
 446 static __be32
 447 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 448 {
 449         DECODE_HEAD;
 450
 451         READ_BUF(12);
 452         READ64(commit->co_offset);
 453         READ32(commit->co_count);
 454
 455         DECODE_TAIL;
 456 }
 457
 458 static __be32
 459 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 460 {
 461         DECODE_HEAD;
 462
 463         READ_BUF(4);
 464         READ32(create->cr_type);
 465         switch (create->cr_type) {
 466         case NF4LNK:
 467                 READ_BUF(4);
 468                 READ32(create->cr_linklen);
 469                 READ_BUF(create->cr_linklen);
 470                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 471                 break;
 472         case NF4BLK:
 473         case NF4CHR:
 474                 READ_BUF(8);
 475                 READ32(create->cr_specdata1);
 476                 READ32(create->cr_specdata2);
 477                 break;
 478         case NF4SOCK:
 479         case NF4FIFO:
 480         case NF4DIR:
 481         default:
 482                 break;
 483         }
 484
 485         READ_BUF(4);
 486         READ32(create->cr_namelen);
 487         READ_BUF(create->cr_namelen);
 488         SAVEMEM(create->cr_name, create->cr_namelen);
 489         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 490                 return status;
 491
 492         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 493                 goto out;
 494
 495         DECODE_TAIL;
 496 }
 497
 498 static inline __be32
 499 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 500 {
 501         DECODE_HEAD;
 502
 503         READ_BUF(sizeof(stateid_t));
 504         READ32(dr->dr_stateid.si_generation);
 505         COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
 506
 507         DECODE_TAIL;
 508 }
 509
 510 static inline __be32
 511 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 512 {
 513         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 514 }
 515
 516 static __be32
 517 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 518 {
 519         DECODE_HEAD;
 520
 521         READ_BUF(4);
 522         READ32(link->li_namelen);
 523         READ_BUF(link->li_namelen);
 524         SAVEMEM(link->li_name, link->li_namelen);
 525         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 526                 return status;
 527
 528         DECODE_TAIL;
 529 }
 530
 531 static __be32
 532 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 533 {
 534         DECODE_HEAD;
 535
 536         lock->lk_replay_owner = NULL;
 537         /*
 538         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 539         */
 540         READ_BUF(28);
 541         READ32(lock->lk_type);
 542         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 543                 goto xdr_error;
 544         READ32(lock->lk_reclaim);
 545         READ64(lock->lk_offset);
 546         READ64(lock->lk_length);
 547         READ32(lock->lk_is_new);
 548
 549         if (lock->lk_is_new) {
 550                 READ_BUF(36);
 551                 READ32(lock->lk_new_open_seqid);
 552                 READ32(lock->lk_new_open_stateid.si_generation);
 553
 554                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
 555                 READ32(lock->lk_new_lock_seqid);
 556                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 557                 READ32(lock->lk_new_owner.len);
 558                 READ_BUF(lock->lk_new_owner.len);
 559                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 560         } else {
 561                 READ_BUF(20);
 562                 READ32(lock->lk_old_lock_stateid.si_generation);
 563                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
 564                 READ32(lock->lk_old_lock_seqid);
 565         }
 566
 567         DECODE_TAIL;
 568 }
 569
 570 static __be32
 571 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 572 {
 573         DECODE_HEAD;
 574
 575         READ_BUF(32);
 576         READ32(lockt->lt_type);
 577         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 578                 goto xdr_error;
 579         READ64(lockt->lt_offset);
 580         READ64(lockt->lt_length);
 581         COPYMEM(&lockt->lt_clientid, 8);
 582         READ32(lockt->lt_owner.len);
 583         READ_BUF(lockt->lt_owner.len);
 584         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 585
 586         DECODE_TAIL;
 587 }
 588
 589 static __be32
 590 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 591 {
 592         DECODE_HEAD;
 593
 594         locku->lu_stateowner = NULL;
 595         READ_BUF(24 + sizeof(stateid_t));
 596         READ32(locku->lu_type);
 597         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 598                 goto xdr_error;
 599         READ32(locku->lu_seqid);
 600         READ32(locku->lu_stateid.si_generation);
 601         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
 602         READ64(locku->lu_offset);
 603         READ64(locku->lu_length);
 604
 605         DECODE_TAIL;
 606 }
 607
 608 static __be32
 609 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 610 {
 611         DECODE_HEAD;
 612
 613         READ_BUF(4);
 614         READ32(lookup->lo_len);
 615         READ_BUF(lookup->lo_len);
 616         SAVEMEM(lookup->lo_name, lookup->lo_len);
 617         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 618                 return status;
 619
 620         DECODE_TAIL;
 621 }
 622
 623 static __be32
 624 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 625 {
 626         DECODE_HEAD;
 627
 628         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 629         open->op_iattr.ia_valid = 0;
 630         open->op_stateowner = NULL;
 631
 632         /* seqid, share_access, share_deny, clientid, ownerlen */
 633         READ_BUF(16 + sizeof(clientid_t));
 634         READ32(open->op_seqid);
 635         READ32(open->op_share_access);
 636         READ32(open->op_share_deny);
 637         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 638         READ32(open->op_owner.len);
 639
 640         /* owner, open_flag */
 641         READ_BUF(open->op_owner.len + 4);
 642         SAVEMEM(open->op_owner.data, open->op_owner.len);
 643         READ32(open->op_create);
 644         switch (open->op_create) {
 645         case NFS4_OPEN_NOCREATE:
 646                 break;
 647         case NFS4_OPEN_CREATE:
 648                 READ_BUF(4);
 649                 READ32(open->op_createmode);
 650                 switch (open->op_createmode) {
 651                 case NFS4_CREATE_UNCHECKED:
 652                 case NFS4_CREATE_GUARDED:
 653                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 654                                 goto out;
 655                         break;
 656                 case NFS4_CREATE_EXCLUSIVE:
 657                         READ_BUF(8);
 658                         COPYMEM(open->op_verf.data, 8);
 659                         break;
 660                 default:
 661                         goto xdr_error;
 662                 }
 663                 break;
 664         default:
 665                 goto xdr_error;
 666         }
 667
 668         /* open_claim */
 669         READ_BUF(4);
 670         READ32(open->op_claim_type);
 671         switch (open->op_claim_type) {
 672         case NFS4_OPEN_CLAIM_NULL:
 673         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 674                 READ_BUF(4);
 675                 READ32(open->op_fname.len);
 676                 READ_BUF(open->op_fname.len);
 677                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 678                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 679                         return status;
 680                 break;
 681         case NFS4_OPEN_CLAIM_PREVIOUS:
 682                 READ_BUF(4);
 683                 READ32(open->op_delegate_type);
 684                 break;
 685         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 686                 READ_BUF(sizeof(stateid_t) + 4);
 687                 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
 688                 READ32(open->op_fname.len);
 689                 READ_BUF(open->op_fname.len);
 690                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 691                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 692                         return status;
 693                 break;
 694         default:
 695                 goto xdr_error;
 696         }
 697
 698         DECODE_TAIL;
 699 }
 700
 701 static __be32
 702 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 703 {
 704         DECODE_HEAD;
 705
 706         open_conf->oc_stateowner = NULL;
 707         READ_BUF(4 + sizeof(stateid_t));
 708         READ32(open_conf->oc_req_stateid.si_generation);
 709         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
 710         READ32(open_conf->oc_seqid);
 711
 712         DECODE_TAIL;
 713 }
 714
 715 static __be32
 716 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 717 {
 718         DECODE_HEAD;
 719
 720         open_down->od_stateowner = NULL;
 721         READ_BUF(12 + sizeof(stateid_t));
 722         READ32(open_down->od_stateid.si_generation);
 723         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
 724         READ32(open_down->od_seqid);
 725         READ32(open_down->od_share_access);
 726         READ32(open_down->od_share_deny);
 727
 728         DECODE_TAIL;
 729 }
 730
 731 static __be32
 732 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 733 {
 734         DECODE_HEAD;
 735
 736         READ_BUF(4);
 737         READ32(putfh->pf_fhlen);
 738         if (putfh->pf_fhlen > NFS4_FHSIZE)
 739                 goto xdr_error;
 740         READ_BUF(putfh->pf_fhlen);
 741         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 742
 743         DECODE_TAIL;
 744 }
 745
 746 static __be32
 747 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 748 {
 749         DECODE_HEAD;
 750
 751         READ_BUF(sizeof(stateid_t) + 12);
 752         READ32(read->rd_stateid.si_generation);
 753         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
 754         READ64(read->rd_offset);
 755         READ32(read->rd_length);
 756
 757         DECODE_TAIL;
 758 }
 759
 760 static __be32
 761 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 762 {
 763         DECODE_HEAD;
 764
 765         READ_BUF(24);
 766         READ64(readdir->rd_cookie);
 767         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 768         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 769         READ32(readdir->rd_maxcount);
 770         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 771                 goto out;
 772
 773         DECODE_TAIL;
 774 }
 775
 776 static __be32
 777 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 778 {
 779         DECODE_HEAD;
 780
 781         READ_BUF(4);
 782         READ32(remove->rm_namelen);
 783         READ_BUF(remove->rm_namelen);
 784         SAVEMEM(remove->rm_name, remove->rm_namelen);
 785         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 786                 return status;
 787
 788         DECODE_TAIL;
 789 }
 790
 791 static __be32
 792 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 793 {
 794         DECODE_HEAD;
 795
 796         READ_BUF(4);
 797         READ32(rename->rn_snamelen);
 798         READ_BUF(rename->rn_snamelen + 4);
 799         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 800         READ32(rename->rn_tnamelen);
 801         READ_BUF(rename->rn_tnamelen);
 802         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 803         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 804                 return status;
 805         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 806                 return status;
 807
 808         DECODE_TAIL;
 809 }
 810
 811 static __be32
 812 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 813 {
 814         DECODE_HEAD;
 815
 816         READ_BUF(sizeof(clientid_t));
 817         COPYMEM(clientid, sizeof(clientid_t));
 818
 819         DECODE_TAIL;
 820 }
 821
 822 static __be32
 823 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 824                      struct nfsd4_secinfo *secinfo)
 825 {
 826         DECODE_HEAD;
 827
 828         READ_BUF(4);
 829         READ32(secinfo->si_namelen);
 830         READ_BUF(secinfo->si_namelen);
 831         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 832         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 833                                                                 nfserr_noent);
 834         if (status)
 835                 return status;
 836         DECODE_TAIL;
 837 }
 838
 839 static __be32
 840 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 841 {
 842         DECODE_HEAD;
 843
 844         READ_BUF(sizeof(stateid_t));
 845         READ32(setattr->sa_stateid.si_generation);
 846         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 847         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 848                 goto out;
 849
 850         DECODE_TAIL;
 851 }
 852
 853 static __be32
 854 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 855 {
 856         DECODE_HEAD;
 857
 858         READ_BUF(12);
 859         COPYMEM(setclientid->se_verf.data, 8);
 860         READ32(setclientid->se_namelen);
 861
 862         READ_BUF(setclientid->se_namelen + 8);
 863         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 864         READ32(setclientid->se_callback_prog);
 865         READ32(setclientid->se_callback_netid_len);
 866
 867         READ_BUF(setclientid->se_callback_netid_len + 4);
 868         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 869         READ32(setclientid->se_callback_addr_len);
 870
 871         READ_BUF(setclientid->se_callback_addr_len + 4);
 872         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 873         READ32(setclientid->se_callback_ident);
 874
 875         DECODE_TAIL;
 876 }
 877
 878 static __be32
 879 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 880 {
 881         DECODE_HEAD;
 882
 883         READ_BUF(8 + sizeof(nfs4_verifier));
 884         COPYMEM(&scd_c->sc_clientid, 8);
 885         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 886
 887         DECODE_TAIL;
 888 }
 889
 890 /* Also used for NVERIFY */
 891 static __be32
 892 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 893 {
 894 #if 0
 895         struct nfsd4_compoundargs save = {
 896                 .p = argp->p,
 897                 .end = argp->end,
 898                 .rqstp = argp->rqstp,
 899         };
 900         u32             ve_bmval[2];
 901         struct iattr    ve_iattr;           /* request */
 902         struct nfs4_acl *ve_acl;            /* request */
 903 #endif
 904         DECODE_HEAD;
 905
 906         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 907                 goto out;
 908
 909         /* For convenience's sake, we compare raw xdr'd attributes in
 910          * nfsd4_proc_verify; however we still decode here just to return
 911          * correct error in case of bad xdr. */
 912 #if 0
 913         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 914         if (status == nfserr_inval) {
 915                 status = nfserrno(status);
 916                 goto out;
 917         }
 918 #endif
 919         READ_BUF(4);
 920         READ32(verify->ve_attrlen);
 921         READ_BUF(verify->ve_attrlen);
 922         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 923
 924         DECODE_TAIL;
 925 }
 926
 927 static __be32
 928 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 929 {
 930         int avail;
 931         int v;
 932         int len;
 933         DECODE_HEAD;
 934
 935         READ_BUF(sizeof(stateid_opaque_t) + 20);
 936         READ32(write->wr_stateid.si_generation);
 937         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
 938         READ64(write->wr_offset);
 939         READ32(write->wr_stable_how);
 940         if (write->wr_stable_how > 2)
 941                 goto xdr_error;
 942         READ32(write->wr_buflen);
 943
 944         /* Sorry .. no magic macros for this.. *
 945          * READ_BUF(write->wr_buflen);
 946          * SAVEMEM(write->wr_buf, write->wr_buflen);
 947          */
 948         avail = (char*)argp->end - (char*)argp->p;
 949         if (avail + argp->pagelen < write->wr_buflen) {
 950                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__);
 951                 goto xdr_error;
 952         }
 953         argp->rqstp->rq_vec[0].iov_base = p;
 954         argp->rqstp->rq_vec[0].iov_len = avail;
 955         v = 0;
 956         len = write->wr_buflen;
 957         while (len > argp->rqstp->rq_vec[v].iov_len) {
 958                 len -= argp->rqstp->rq_vec[v].iov_len;
 959                 v++;
 960                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 961                 argp->pagelist++;
 962                 if (argp->pagelen >= PAGE_SIZE) {
 963                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 964                         argp->pagelen -= PAGE_SIZE;
 965                 } else {
 966                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 967                         argp->pagelen -= len;
 968                 }
 969         }
 970         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 971         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 972         argp->rqstp->rq_vec[v].iov_len = len;
 973         write->wr_vlen = v+1;
 974
 975         DECODE_TAIL;
 976 }
 977
 978 static __be32
 979 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 980 {
 981         DECODE_HEAD;
 982
 983         READ_BUF(12);
 984         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 985         READ32(rlockowner->rl_owner.len);
 986         READ_BUF(rlockowner->rl_owner.len);
 987         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 988
 989         DECODE_TAIL;
 990 }
 991
 992 static __be32
 993 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 994 {
 995         DECODE_HEAD;
 996         struct nfsd4_op *op;
 997         int i;
 998
 999         /*
1000          * XXX: According to spec, we should check the tag
1001          * for UTF-8 compliance.  I'm postponing this for
1002          * now because it seems that some clients do use
1003          * binary tags.
1004          */
1005         READ_BUF(4);
1006         READ32(argp->taglen);
1007         READ_BUF(argp->taglen + 8);
1008         SAVEMEM(argp->tag, argp->taglen);
1009         READ32(argp->minorversion);
1010         READ32(argp->opcnt);
1011
1012         if (argp->taglen > NFSD4_MAX_TAGLEN)
1013                 goto xdr_error;
1014         if (argp->opcnt > 100)
1015                 goto xdr_error;
1016
1017         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1018                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1019                 if (!argp->ops) {
1020                         argp->ops = argp->iops;
1021                         printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
1022                         goto xdr_error;
1023                 }
1024         }
1025
1026         for (i = 0; i < argp->opcnt; i++) {
1027                 op = &argp->ops[i];
1028                 op->replay = NULL;
1029
1030                 /*
1031                  * We can't use READ_BUF() here because we need to handle
1032                  * a missing opcode as an OP_WRITE + 1. So we need to check
1033                  * to see if we're truly at the end of our buffer or if there
1034                  * is another page we need to flip to.
1035                  */
1036
1037                 if (argp->p == argp->end) {
1038                         if (argp->pagelen < 4) {
1039                                 /* There isn't an opcode still on the wire */
1040                                 op->opnum = OP_WRITE + 1;
1041                                 op->status = nfserr_bad_xdr;
1042                                 argp->opcnt = i+1;
1043                                 break;
1044                         }
1045
1046                         /*
1047                          * False alarm. We just hit a page boundary, but there
1048                          * is still data available.  Move pointer across page
1049                          * boundary.  *snip from READ_BUF*
1050                          */
1051                         argp->p = page_address(argp->pagelist[0]);
1052                         argp->pagelist++;
1053                         if (argp->pagelen < PAGE_SIZE) {
1054                                 argp->end = p + (argp->pagelen>>2);
1055                                 argp->pagelen = 0;
1056                         } else {
1057                                 argp->end = p + (PAGE_SIZE>>2);
1058                                 argp->pagelen -= PAGE_SIZE;
1059                         }
1060                 }
1061                 op->opnum = ntohl(*argp->p++);
1062
1063                 switch (op->opnum) {
1064                 case 2: /* Reserved operation */
1065                         op->opnum = OP_ILLEGAL;
1066                         if (argp->minorversion == 0)
1067                                 op->status = nfserr_op_illegal;
1068                         else
1069                                 op->status = nfserr_minor_vers_mismatch;
1070                         break;
1071                 case OP_ACCESS:
1072                         op->status = nfsd4_decode_access(argp, &op->u.access);
1073                         break;
1074                 case OP_CLOSE:
1075                         op->status = nfsd4_decode_close(argp, &op->u.close);
1076                         break;
1077                 case OP_COMMIT:
1078                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1079                         break;
1080                 case OP_CREATE:
1081                         op->status = nfsd4_decode_create(argp, &op->u.create);
1082                         break;
1083                 case OP_DELEGRETURN:
1084                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1085                         break;
1086                 case OP_GETATTR:
1087                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1088                         break;
1089                 case OP_GETFH:
1090                         op->status = nfs_ok;
1091                         break;
1092                 case OP_LINK:
1093                         op->status = nfsd4_decode_link(argp, &op->u.link);
1094                         break;
1095                 case OP_LOCK:
1096                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1097                         break;
1098                 case OP_LOCKT:
1099                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1100                         break;
1101                 case OP_LOCKU:
1102                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1103                         break;
1104                 case OP_LOOKUP:
1105                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1106                         break;
1107                 case OP_LOOKUPP:
1108                         op->status = nfs_ok;
1109                         break;
1110                 case OP_NVERIFY:
1111                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1112                         break;
1113                 case OP_OPEN:
1114                         op->status = nfsd4_decode_open(argp, &op->u.open);
1115                         break;
1116                 case OP_OPEN_CONFIRM:
1117                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1118                         break;
1119                 case OP_OPEN_DOWNGRADE:
1120                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1121                         break;
1122                 case OP_PUTFH:
1123                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1124                         break;
1125                 case OP_PUTROOTFH:
1126                         op->status = nfs_ok;
1127                         break;
1128                 case OP_READ:
1129                         op->status = nfsd4_decode_read(argp, &op->u.read);
1130                         break;
1131                 case OP_READDIR:
1132                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1133                         break;
1134                 case OP_READLINK:
1135                         op->status = nfs_ok;
1136                         break;
1137                 case OP_REMOVE:
1138                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1139                         break;
1140                 case OP_RENAME:
1141                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1142                         break;
1143                 case OP_RESTOREFH:
1144                         op->status = nfs_ok;
1145                         break;
1146                 case OP_RENEW:
1147                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1148                         break;
1149                 case OP_SAVEFH:
1150                         op->status = nfs_ok;
1151                         break;
1152                 case OP_SECINFO:
1153                         op->status = nfsd4_decode_secinfo(argp, &op->u.secinfo);
1154                         break;
1155                 case OP_SETATTR:
1156                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1157                         break;
1158                 case OP_SETCLIENTID:
1159                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1160                         break;
1161                 case OP_SETCLIENTID_CONFIRM:
1162                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1163                         break;
1164                 case OP_VERIFY:
1165                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1166                         break;
1167                 case OP_WRITE:
1168                         op->status = nfsd4_decode_write(argp, &op->u.write);
1169                         break;
1170                 case OP_RELEASE_LOCKOWNER:
1171                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1172                         break;
1173                 default:
1174                         op->opnum = OP_ILLEGAL;
1175                         op->status = nfserr_op_illegal;
1176                         break;
1177                 }
1178
1179                 if (op->status) {
1180                         argp->opcnt = i+1;
1181                         break;
1182                 }
1183         }
1184
1185         DECODE_TAIL;
1186 }
1187 /*
1188  * END OF "GENERIC" DECODE ROUTINES.
1189  */
1190
1191 /*
1192  * START OF "GENERIC" ENCODE ROUTINES.
1193  *   These may look a little ugly since they are imported from a "generic"
1194  * set of XDR encode/decode routines which are intended to be shared by
1195  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1196  *
1197  * If the pain of reading these is too great, it should be a straightforward
1198  * task to translate them into Linux-specific versions which are more
1199  * consistent with the style used in NFSv2/v3...
1200  */
1201 #define ENCODE_HEAD              __be32 *p
1202
1203 #define WRITE32(n)               *p++ = htonl(n)
1204 #define WRITE64(n)               do {                           \
1205         *p++ = htonl((u32)((n) >> 32));                         \
1206         *p++ = htonl((u32)(n));                                 \
1207 } while (0)
1208 #define WRITEMEM(ptr,nbytes)     do {                           \
1209         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1210         memcpy(p, ptr, nbytes);                                 \
1211         p += XDR_QUADLEN(nbytes);                               \
1212 } while (0)
1213 #define WRITECINFO(c)           do {                            \
1214         *p++ = htonl(c.atomic);                                 \
1215         *p++ = htonl(c.before_ctime_sec);                               \
1216         *p++ = htonl(c.before_ctime_nsec);                              \
1217         *p++ = htonl(c.after_ctime_sec);                                \
1218         *p++ = htonl(c.after_ctime_nsec);                               \
1219 } while (0)
1220
1221 #define RESERVE_SPACE(nbytes)   do {                            \
1222         p = resp->p;                                            \
1223         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1224 } while (0)
1225 #define ADJUST_ARGS()           resp->p = p
1226
1227 /*
1228  * Header routine to setup seqid operation replay cache
1229  */
1230 #define ENCODE_SEQID_OP_HEAD                                    \
1231         __be32 *p;                                              \
1232         __be32 *save;                                           \
1233                                                                 \
1234         save = resp->p;
1235
1236 /*
1237  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1238  * is where sequence id's are incremented, and the replay cache is filled.
1239  * Note that we increment sequence id's here, at the last moment, so we're sure
1240  * we know whether the error to be returned is a sequence id mutating error.
1241  */
1242
1243 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1244         if (seqid_mutating_err(nfserr) && stateowner) {         \
1245                 stateowner->so_seqid++;                         \
1246                 stateowner->so_replay.rp_status = nfserr;       \
1247                 stateowner->so_replay.rp_buflen =               \
1248                           (((char *)(resp)->p - (char *)save)); \
1249                 memcpy(stateowner->so_replay.rp_buf, save,      \
1250                         stateowner->so_replay.rp_buflen);       \
1251         } } while (0);
1252
1253 /* Encode as an array of strings the string given with components
1254  * seperated @sep.
1255  */
1256 static __be32 nfsd4_encode_components(char sep, char *components,
1257                                    __be32 **pp, int *buflen)
1258 {
1259         __be32 *p = *pp;
1260         __be32 *countp = p;
1261         int strlen, count=0;
1262         char *str, *end;
1263
1264         dprintk("nfsd4_encode_components(%s)\n", components);
1265         if ((*buflen -= 4) < 0)
1266                 return nfserr_resource;
1267         WRITE32(0); /* We will fill this in with @count later */
1268         end = str = components;
1269         while (*end) {
1270                 for (; *end && (*end != sep); end++)
1271                         ; /* Point to end of component */
1272                 strlen = end - str;
1273                 if (strlen) {
1274                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1275                                 return nfserr_resource;
1276                         WRITE32(strlen);
1277                         WRITEMEM(str, strlen);
1278                         count++;
1279                 }
1280                 else
1281                         end++;
1282                 str = end;
1283         }
1284         *pp = p;
1285         p = countp;
1286         WRITE32(count);
1287         return 0;
1288 }
1289
1290 /*
1291  * encode a location element of a fs_locations structure
1292  */
1293 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1294                                     __be32 **pp, int *buflen)
1295 {
1296         __be32 status;
1297         __be32 *p = *pp;
1298
1299         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1300         if (status)
1301                 return status;
1302         status = nfsd4_encode_components('/', location->path, &p, buflen);
1303         if (status)
1304                 return status;
1305         *pp = p;
1306         return 0;
1307 }
1308
1309 /*
1310  * Return the path to an export point in the pseudo filesystem namespace
1311  * Returned string is safe to use as long as the caller holds a reference
1312  * to @exp.
1313  */
1314 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1315 {
1316         struct svc_fh tmp_fh;
1317         char *path, *rootpath;
1318
1319         fh_init(&tmp_fh, NFS4_FHSIZE);
1320         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1321         if (*stat)
1322                 return NULL;
1323         rootpath = tmp_fh.fh_export->ex_path;
1324
1325         path = exp->ex_path;
1326
1327         if (strncmp(path, rootpath, strlen(rootpath))) {
1328                 printk("nfsd: fs_locations failed;"
1329                         "%s is not contained in %s\n", path, rootpath);
1330                 *stat = nfserr_notsupp;
1331                 return NULL;
1332         }
1333
1334         return path + strlen(rootpath);
1335 }
1336
1337 /*
1338  *  encode a fs_locations structure
1339  */
1340 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1341                                      struct svc_export *exp,
1342                                      __be32 **pp, int *buflen)
1343 {
1344         __be32 status;
1345         int i;
1346         __be32 *p = *pp;
1347         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1348         char *root = nfsd4_path(rqstp, exp, &status);
1349
1350         if (status)
1351                 return status;
1352         status = nfsd4_encode_components('/', root, &p, buflen);
1353         if (status)
1354                 return status;
1355         if ((*buflen -= 4) < 0)
1356                 return nfserr_resource;
1357         WRITE32(fslocs->locations_count);
1358         for (i=0; i<fslocs->locations_count; i++) {
1359                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1360                                                    &p, buflen);
1361                 if (status)
1362                         return status;
1363         }
1364         *pp = p;
1365         return 0;
1366 }
1367
1368 static u32 nfs4_ftypes[16] = {
1369         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1370         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1371         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1372         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1373 };
1374
1375 static __be32
1376 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1377                         __be32 **p, int *buflen)
1378 {
1379         int status;
1380
1381         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1382                 return nfserr_resource;
1383         if (whotype != NFS4_ACL_WHO_NAMED)
1384                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1385         else if (group)
1386                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1387         else
1388                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1389         if (status < 0)
1390                 return nfserrno(status);
1391         *p = xdr_encode_opaque(*p, NULL, status);
1392         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1393         BUG_ON(*buflen < 0);
1394         return 0;
1395 }
1396
1397 static inline __be32
1398 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1399 {
1400         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1401 }
1402
1403 static inline __be32
1404 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1405 {
1406         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1407 }
1408
1409 static inline __be32
1410 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1411                 __be32 **p, int *buflen)
1412 {
1413         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1414 }
1415
1416 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1417                               FATTR4_WORD0_RDATTR_ERROR)
1418 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1419
1420 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1421 {
1422         /* As per referral draft:  */
1423         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1424             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1425                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1426                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1427                         *rdattr_err = NFSERR_MOVED;
1428                 else
1429                         return nfserr_moved;
1430         }
1431         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1432         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1433         return 0;
1434 }
1435
1436 /*
1437  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1438  * ourselves.
1439  *
1440  * @countp is the buffer size in _words_; upon successful return this becomes
1441  * replaced with the number of words written.
1442  */
1443 __be32
1444 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1445                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1446                 struct svc_rqst *rqstp)
1447 {
1448         u32 bmval0 = bmval[0];
1449         u32 bmval1 = bmval[1];
1450         struct kstat stat;
1451         struct svc_fh tempfh;
1452         struct kstatfs statfs;
1453         int buflen = *countp << 2;
1454         __be32 *attrlenp;
1455         u32 dummy;
1456         u64 dummy64;
1457         u32 rdattr_err = 0;
1458         __be32 *p = buffer;
1459         __be32 status;
1460         int err;
1461         int aclsupport = 0;
1462         struct nfs4_acl *acl = NULL;
1463
1464         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1465         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1466         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1467
1468         if (exp->ex_fslocs.migrated) {
1469                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1470                 if (status)
1471                         goto out;
1472         }
1473
1474         err = vfs_getattr(exp->ex_mnt, dentry, &stat);
1475         if (err)
1476                 goto out_nfserr;
1477         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1478             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1479                        FATTR4_WORD1_SPACE_TOTAL))) {
1480                 err = vfs_statfs(dentry, &statfs);
1481                 if (err)
1482                         goto out_nfserr;
1483         }
1484         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1485                 fh_init(&tempfh, NFS4_FHSIZE);
1486                 status = fh_compose(&tempfh, exp, dentry, NULL);
1487                 if (status)
1488                         goto out;
1489                 fhp = &tempfh;
1490         }
1491         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1492                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1493                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1494                 aclsupport = (err == 0);
1495                 if (bmval0 & FATTR4_WORD0_ACL) {
1496                         if (err == -EOPNOTSUPP)
1497                                 bmval0 &= ~FATTR4_WORD0_ACL;
1498                         else if (err == -EINVAL) {
1499                                 status = nfserr_attrnotsupp;
1500                                 goto out;
1501                         } else if (err != 0)
1502                                 goto out_nfserr;
1503                 }
1504         }
1505         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1506                 if (exp->ex_fslocs.locations == NULL) {
1507                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1508                 }
1509         }
1510         if ((buflen -= 16) < 0)
1511                 goto out_resource;
1512
1513         WRITE32(2);
1514         WRITE32(bmval0);
1515         WRITE32(bmval1);
1516         attrlenp = p++;                /* to be backfilled later */
1517
1518         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1519                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1520                 if ((buflen -= 12) < 0)
1521                         goto out_resource;
1522                 if (!aclsupport)
1523                         word0 &= ~FATTR4_WORD0_ACL;
1524                 if (!exp->ex_fslocs.locations)
1525                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1526                 WRITE32(2);
1527                 WRITE32(word0);
1528                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1529         }
1530         if (bmval0 & FATTR4_WORD0_TYPE) {
1531                 if ((buflen -= 4) < 0)
1532                         goto out_resource;
1533                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1534                 if (dummy == NF4BAD)
1535                         goto out_serverfault;
1536                 WRITE32(dummy);
1537         }
1538         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1539                 if ((buflen -= 4) < 0)
1540                         goto out_resource;
1541                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1542                         WRITE32(NFS4_FH_PERSISTENT);
1543                 else
1544                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1545         }
1546         if (bmval0 & FATTR4_WORD0_CHANGE) {
1547                 /*
1548                  * Note: This _must_ be consistent with the scheme for writing
1549                  * change_info, so any changes made here must be reflected there
1550                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1551                  * macro above.)
1552                  */
1553                 if ((buflen -= 8) < 0)
1554                         goto out_resource;
1555                 WRITE32(stat.ctime.tv_sec);
1556                 WRITE32(stat.ctime.tv_nsec);
1557         }
1558         if (bmval0 & FATTR4_WORD0_SIZE) {
1559                 if ((buflen -= 8) < 0)
1560                         goto out_resource;
1561                 WRITE64(stat.size);
1562         }
1563         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1564                 if ((buflen -= 4) < 0)
1565                         goto out_resource;
1566                 WRITE32(1);
1567         }
1568         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1569                 if ((buflen -= 4) < 0)
1570                         goto out_resource;
1571                 WRITE32(1);
1572         }
1573         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1574                 if ((buflen -= 4) < 0)
1575                         goto out_resource;
1576                 WRITE32(0);
1577         }
1578         if (bmval0 & FATTR4_WORD0_FSID) {
1579                 if ((buflen -= 16) < 0)
1580                         goto out_resource;
1581                 if (exp->ex_fslocs.migrated) {
1582                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1583                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1584                 } else switch(fsid_source(fhp)) {
1585                 case FSIDSOURCE_FSID:
1586                         WRITE64((u64)exp->ex_fsid);
1587                         WRITE64((u64)0);
1588                         break;
1589                 case FSIDSOURCE_DEV:
1590                         WRITE32(0);
1591                         WRITE32(MAJOR(stat.dev));
1592                         WRITE32(0);
1593                         WRITE32(MINOR(stat.dev));
1594                         break;
1595                 case FSIDSOURCE_UUID:
1596                         WRITEMEM(exp->ex_uuid, 16);
1597                         break;
1598                 }
1599         }
1600         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1601                 if ((buflen -= 4) < 0)
1602                         goto out_resource;
1603                 WRITE32(0);
1604         }
1605         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1606                 if ((buflen -= 4) < 0)
1607                         goto out_resource;
1608                 WRITE32(NFSD_LEASE_TIME);
1609         }
1610         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1611                 if ((buflen -= 4) < 0)
1612                         goto out_resource;
1613                 WRITE32(rdattr_err);
1614         }
1615         if (bmval0 & FATTR4_WORD0_ACL) {
1616                 struct nfs4_ace *ace;
1617
1618                 if (acl == NULL) {
1619                         if ((buflen -= 4) < 0)
1620                                 goto out_resource;
1621
1622                         WRITE32(0);
1623                         goto out_acl;
1624                 }
1625                 if ((buflen -= 4) < 0)
1626                         goto out_resource;
1627                 WRITE32(acl->naces);
1628
1629                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1630                         if ((buflen -= 4*3) < 0)
1631                                 goto out_resource;
1632                         WRITE32(ace->type);
1633                         WRITE32(ace->flag);
1634                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1635                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1636                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1637                                 &p, &buflen);
1638                         if (status == nfserr_resource)
1639                                 goto out_resource;
1640                         if (status)
1641                                 goto out;
1642                 }
1643         }
1644 out_acl:
1645         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1646                 if ((buflen -= 4) < 0)
1647                         goto out_resource;
1648                 WRITE32(aclsupport ?
1649                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1650         }
1651         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1652                 if ((buflen -= 4) < 0)
1653                         goto out_resource;
1654                 WRITE32(1);
1655         }
1656         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1657                 if ((buflen -= 4) < 0)
1658                         goto out_resource;
1659                 WRITE32(1);
1660         }
1661         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1662                 if ((buflen -= 4) < 0)
1663                         goto out_resource;
1664                 WRITE32(1);
1665         }
1666         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1667                 if ((buflen -= 4) < 0)
1668                         goto out_resource;
1669                 WRITE32(1);
1670         }
1671         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1672                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1673                 if (buflen < 0)
1674                         goto out_resource;
1675                 WRITE32(fhp->fh_handle.fh_size);
1676                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1677         }
1678         if (bmval0 & FATTR4_WORD0_FILEID) {
1679                 if ((buflen -= 8) < 0)
1680                         goto out_resource;
1681                 WRITE64((u64) stat.ino);
1682         }
1683         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1684                 if ((buflen -= 8) < 0)
1685                         goto out_resource;
1686                 WRITE64((u64) statfs.f_ffree);
1687         }
1688         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1689                 if ((buflen -= 8) < 0)
1690                         goto out_resource;
1691                 WRITE64((u64) statfs.f_ffree);
1692         }
1693         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1694                 if ((buflen -= 8) < 0)
1695                         goto out_resource;
1696                 WRITE64((u64) statfs.f_files);
1697         }
1698         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1699                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1700                 if (status == nfserr_resource)
1701                         goto out_resource;
1702                 if (status)
1703                         goto out;
1704         }
1705         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1706                 if ((buflen -= 4) < 0)
1707                         goto out_resource;
1708                 WRITE32(1);
1709         }
1710         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1711                 if ((buflen -= 8) < 0)
1712                         goto out_resource;
1713                 WRITE64(~(u64)0);
1714         }
1715         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1716                 if ((buflen -= 4) < 0)
1717                         goto out_resource;
1718                 WRITE32(255);
1719         }
1720         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1721                 if ((buflen -= 4) < 0)
1722                         goto out_resource;
1723                 WRITE32(~(u32) 0);
1724         }
1725         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1726                 if ((buflen -= 8) < 0)
1727                         goto out_resource;
1728                 WRITE64((u64) svc_max_payload(rqstp));
1729         }
1730         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1731                 if ((buflen -= 8) < 0)
1732                         goto out_resource;
1733                 WRITE64((u64) svc_max_payload(rqstp));
1734         }
1735         if (bmval1 & FATTR4_WORD1_MODE) {
1736                 if ((buflen -= 4) < 0)
1737                         goto out_resource;
1738                 WRITE32(stat.mode & S_IALLUGO);
1739         }
1740         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1741                 if ((buflen -= 4) < 0)
1742                         goto out_resource;
1743                 WRITE32(1);
1744         }
1745         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1746                 if ((buflen -= 4) < 0)
1747                         goto out_resource;
1748                 WRITE32(stat.nlink);
1749         }
1750         if (bmval1 & FATTR4_WORD1_OWNER) {
1751                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1752                 if (status == nfserr_resource)
1753                         goto out_resource;
1754                 if (status)
1755                         goto out;
1756         }
1757         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1758                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1759                 if (status == nfserr_resource)
1760                         goto out_resource;
1761                 if (status)
1762                         goto out;
1763         }
1764         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1765                 if ((buflen -= 8) < 0)
1766                         goto out_resource;
1767                 WRITE32((u32) MAJOR(stat.rdev));
1768                 WRITE32((u32) MINOR(stat.rdev));
1769         }
1770         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1771                 if ((buflen -= 8) < 0)
1772                         goto out_resource;
1773                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1774                 WRITE64(dummy64);
1775         }
1776         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1777                 if ((buflen -= 8) < 0)
1778                         goto out_resource;
1779                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1780                 WRITE64(dummy64);
1781         }
1782         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1783                 if ((buflen -= 8) < 0)
1784                         goto out_resource;
1785                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1786                 WRITE64(dummy64);
1787         }
1788         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1789                 if ((buflen -= 8) < 0)
1790                         goto out_resource;
1791                 dummy64 = (u64)stat.blocks << 9;
1792                 WRITE64(dummy64);
1793         }
1794         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1795                 if ((buflen -= 12) < 0)
1796                         goto out_resource;
1797                 WRITE32(0);
1798                 WRITE32(stat.atime.tv_sec);
1799                 WRITE32(stat.atime.tv_nsec);
1800         }
1801         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1802                 if ((buflen -= 12) < 0)
1803                         goto out_resource;
1804                 WRITE32(0);
1805                 WRITE32(1);
1806                 WRITE32(0);
1807         }
1808         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1809                 if ((buflen -= 12) < 0)
1810                         goto out_resource;
1811                 WRITE32(0);
1812                 WRITE32(stat.ctime.tv_sec);
1813                 WRITE32(stat.ctime.tv_nsec);
1814         }
1815         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1816                 if ((buflen -= 12) < 0)
1817                         goto out_resource;
1818                 WRITE32(0);
1819                 WRITE32(stat.mtime.tv_sec);
1820                 WRITE32(stat.mtime.tv_nsec);
1821         }
1822         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1823                 struct dentry *mnt_pnt, *mnt_root;
1824
1825                 if ((buflen -= 8) < 0)
1826                         goto out_resource;
1827                 mnt_root = exp->ex_mnt->mnt_root;
1828                 if (mnt_root->d_inode == dentry->d_inode) {
1829                         mnt_pnt = exp->ex_mnt->mnt_mountpoint;
1830                         WRITE64((u64) mnt_pnt->d_inode->i_ino);
1831                 } else
1832                         WRITE64((u64) stat.ino);
1833         }
1834         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1835         *countp = p - buffer;
1836         status = nfs_ok;
1837
1838 out:
1839         kfree(acl);
1840         if (fhp == &tempfh)
1841                 fh_put(&tempfh);
1842         return status;
1843 out_nfserr:
1844         status = nfserrno(err);
1845         goto out;
1846 out_resource:
1847         *countp = 0;
1848         status = nfserr_resource;
1849         goto out;
1850 out_serverfault:
1851         status = nfserr_serverfault;
1852         goto out;
1853 }
1854
1855 static __be32
1856 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1857                 const char *name, int namlen, __be32 *p, int *buflen)
1858 {
1859         struct svc_export *exp = cd->rd_fhp->fh_export;
1860         struct dentry *dentry;
1861         __be32 nfserr;
1862
1863         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1864         if (IS_ERR(dentry))
1865                 return nfserrno(PTR_ERR(dentry));
1866
1867         exp_get(exp);
1868         if (d_mountpoint(dentry)) {
1869                 int err;
1870
1871                 /*
1872                  * Why the heck aren't we just using nfsd_lookup??
1873                  * Different "."/".." handling?  Something else?
1874                  * At least, add a comment here to explain....
1875                  */
1876                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1877                 if (err) {
1878                         nfserr = nfserrno(err);
1879                         goto out_put;
1880                 }
1881                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
1882                 if (nfserr)
1883                         goto out_put;
1884
1885         }
1886         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1887                                         cd->rd_rqstp);
1888 out_put:
1889         dput(dentry);
1890         exp_put(exp);
1891         return nfserr;
1892 }
1893
1894 static __be32 *
1895 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1896 {
1897         __be32 *attrlenp;
1898
1899         if (buflen < 6)
1900                 return NULL;
1901         *p++ = htonl(2);
1902         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1903         *p++ = htonl(0);                         /* bmval1 */
1904
1905         attrlenp = p++;
1906         *p++ = nfserr;       /* no htonl */
1907         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1908         return p;
1909 }
1910
1911 static int
1912 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1913                     loff_t offset, u64 ino, unsigned int d_type)
1914 {
1915         struct readdir_cd *ccd = ccdv;
1916         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1917         int buflen;
1918         __be32 *p = cd->buffer;
1919         __be32 nfserr = nfserr_toosmall;
1920
1921         /* In nfsv4, "." and ".." never make it onto the wire.. */
1922         if (name && isdotent(name, namlen)) {
1923                 cd->common.err = nfs_ok;
1924                 return 0;
1925         }
1926
1927         if (cd->offset)
1928                 xdr_encode_hyper(cd->offset, (u64) offset);
1929
1930         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1931         if (buflen < 0)
1932                 goto fail;
1933
1934         *p++ = xdr_one;                             /* mark entry present */
1935         cd->offset = p;                             /* remember pointer */
1936         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1937         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1938
1939         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1940         switch (nfserr) {
1941         case nfs_ok:
1942                 p += buflen;
1943                 break;
1944         case nfserr_resource:
1945                 nfserr = nfserr_toosmall;
1946                 goto fail;
1947         case nfserr_dropit:
1948                 goto fail;
1949         default:
1950                 /*
1951                  * If the client requested the RDATTR_ERROR attribute,
1952                  * we stuff the error code into this attribute
1953                  * and continue.  If this attribute was not requested,
1954                  * then in accordance with the spec, we fail the
1955                  * entire READDIR operation(!)
1956                  */
1957                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1958                         goto fail;
1959                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1960                 if (p == NULL) {
1961                         nfserr = nfserr_toosmall;
1962                         goto fail;
1963                 }
1964         }
1965         cd->buflen -= (p - cd->buffer);
1966         cd->buffer = p;
1967         cd->common.err = nfs_ok;
1968         return 0;
1969 fail:
1970         cd->common.err = nfserr;
1971         return -EINVAL;
1972 }
1973
1974 static void
1975 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1976 {
1977         ENCODE_HEAD;
1978
1979         if (!nfserr) {
1980                 RESERVE_SPACE(8);
1981                 WRITE32(access->ac_supported);
1982                 WRITE32(access->ac_resp_access);
1983                 ADJUST_ARGS();
1984         }
1985 }
1986
1987 static void
1988 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1989 {
1990         ENCODE_SEQID_OP_HEAD;
1991
1992         if (!nfserr) {
1993                 RESERVE_SPACE(sizeof(stateid_t));
1994                 WRITE32(close->cl_stateid.si_generation);
1995                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1996                 ADJUST_ARGS();
1997         }
1998         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1999 }
2000
2001
2002 static void
2003 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2004 {
2005         ENCODE_HEAD;
2006
2007         if (!nfserr) {
2008                 RESERVE_SPACE(8);
2009                 WRITEMEM(commit->co_verf.data, 8);
2010                 ADJUST_ARGS();
2011         }
2012 }
2013
2014 static void
2015 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2016 {
2017         ENCODE_HEAD;
2018
2019         if (!nfserr) {
2020                 RESERVE_SPACE(32);
2021                 WRITECINFO(create->cr_cinfo);
2022                 WRITE32(2);
2023                 WRITE32(create->cr_bmval[0]);
2024                 WRITE32(create->cr_bmval[1]);
2025                 ADJUST_ARGS();
2026         }
2027 }
2028
2029 static __be32
2030 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2031 {
2032         struct svc_fh *fhp = getattr->ga_fhp;
2033         int buflen;
2034
2035         if (nfserr)
2036                 return nfserr;
2037
2038         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2039         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2040                                     resp->p, &buflen, getattr->ga_bmval,
2041                                     resp->rqstp);
2042         if (!nfserr)
2043                 resp->p += buflen;
2044         return nfserr;
2045 }
2046
2047 static void
2048 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh *fhp)
2049 {
2050         unsigned int len;
2051         ENCODE_HEAD;
2052
2053         if (!nfserr) {
2054                 len = fhp->fh_handle.fh_size;
2055                 RESERVE_SPACE(len + 4);
2056                 WRITE32(len);
2057                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2058                 ADJUST_ARGS();
2059         }
2060 }
2061
2062 /*
2063 * Including all fields other than the name, a LOCK4denied structure requires
2064 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2065 */
2066 static void
2067 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2068 {
2069         ENCODE_HEAD;
2070
2071         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2072         WRITE64(ld->ld_start);
2073         WRITE64(ld->ld_length);
2074         WRITE32(ld->ld_type);
2075         if (ld->ld_sop) {
2076                 WRITEMEM(&ld->ld_clientid, 8);
2077                 WRITE32(ld->ld_sop->so_owner.len);
2078                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2079                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2080         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2081                 WRITE64((u64)0); /* clientid */
2082                 WRITE32(0); /* length of owner name */
2083         }
2084         ADJUST_ARGS();
2085 }
2086
2087 static void
2088 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2089 {
2090         ENCODE_SEQID_OP_HEAD;
2091
2092         if (!nfserr) {
2093                 RESERVE_SPACE(4 + sizeof(stateid_t));
2094                 WRITE32(lock->lk_resp_stateid.si_generation);
2095                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2096                 ADJUST_ARGS();
2097         } else if (nfserr == nfserr_denied)
2098                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2099
2100         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2101 }
2102
2103 static void
2104 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2105 {
2106         if (nfserr == nfserr_denied)
2107                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2108 }
2109
2110 static void
2111 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2112 {
2113         ENCODE_SEQID_OP_HEAD;
2114
2115         if (!nfserr) {
2116                 RESERVE_SPACE(sizeof(stateid_t));
2117                 WRITE32(locku->lu_stateid.si_generation);
2118                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2119                 ADJUST_ARGS();
2120         }
2121
2122         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2123 }
2124
2125
2126 static void
2127 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2128 {
2129         ENCODE_HEAD;
2130
2131         if (!nfserr) {
2132                 RESERVE_SPACE(20);
2133                 WRITECINFO(link->li_cinfo);
2134                 ADJUST_ARGS();
2135         }
2136 }
2137
2138
2139 static void
2140 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2141 {
2142         ENCODE_SEQID_OP_HEAD;
2143
2144         if (nfserr)
2145                 goto out;
2146
2147         RESERVE_SPACE(36 + sizeof(stateid_t));
2148         WRITE32(open->op_stateid.si_generation);
2149         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2150         WRITECINFO(open->op_cinfo);
2151         WRITE32(open->op_rflags);
2152         WRITE32(2);
2153         WRITE32(open->op_bmval[0]);
2154         WRITE32(open->op_bmval[1]);
2155         WRITE32(open->op_delegate_type);
2156         ADJUST_ARGS();
2157
2158         switch (open->op_delegate_type) {
2159         case NFS4_OPEN_DELEGATE_NONE:
2160                 break;
2161         case NFS4_OPEN_DELEGATE_READ:
2162                 RESERVE_SPACE(20 + sizeof(stateid_t));
2163                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2164                 WRITE32(open->op_recall);
2165
2166                 /*
2167                  * TODO: ACE's in delegations
2168                  */
2169                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2170                 WRITE32(0);
2171                 WRITE32(0);
2172                 WRITE32(0);   /* XXX: is NULL principal ok? */
2173                 ADJUST_ARGS();
2174                 break;
2175         case NFS4_OPEN_DELEGATE_WRITE:
2176                 RESERVE_SPACE(32 + sizeof(stateid_t));
2177                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2178                 WRITE32(0);
2179
2180                 /*
2181                  * TODO: space_limit's in delegations
2182                  */
2183                 WRITE32(NFS4_LIMIT_SIZE);
2184                 WRITE32(~(u32)0);
2185                 WRITE32(~(u32)0);
2186
2187                 /*
2188                  * TODO: ACE's in delegations
2189                  */
2190                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2191                 WRITE32(0);
2192                 WRITE32(0);
2193                 WRITE32(0);   /* XXX: is NULL principal ok? */
2194                 ADJUST_ARGS();
2195                 break;
2196         default:
2197                 BUG();
2198         }
2199         /* XXX save filehandle here */
2200 out:
2201         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2202 }
2203
2204 static void
2205 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2206 {
2207         ENCODE_SEQID_OP_HEAD;
2208
2209         if (!nfserr) {
2210                 RESERVE_SPACE(sizeof(stateid_t));
2211                 WRITE32(oc->oc_resp_stateid.si_generation);
2212                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2213                 ADJUST_ARGS();
2214         }
2215
2216         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2217 }
2218
2219 static void
2220 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2221 {
2222         ENCODE_SEQID_OP_HEAD;
2223
2224         if (!nfserr) {
2225                 RESERVE_SPACE(sizeof(stateid_t));
2226                 WRITE32(od->od_stateid.si_generation);
2227                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2228                 ADJUST_ARGS();
2229         }
2230
2231         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2232 }
2233
2234 static __be32
2235 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2236                   struct nfsd4_read *read)
2237 {
2238         u32 eof;
2239         int v, pn;
2240         unsigned long maxcount;
2241         long len;
2242         ENCODE_HEAD;
2243
2244         if (nfserr)
2245                 return nfserr;
2246         if (resp->xbuf->page_len)
2247                 return nfserr_resource;
2248
2249         RESERVE_SPACE(8); /* eof flag and byte count */
2250
2251         maxcount = svc_max_payload(resp->rqstp);
2252         if (maxcount > read->rd_length)
2253                 maxcount = read->rd_length;
2254
2255         len = maxcount;
2256         v = 0;
2257         while (len > 0) {
2258                 pn = resp->rqstp->rq_resused++;
2259                 resp->rqstp->rq_vec[v].iov_base =
2260                         page_address(resp->rqstp->rq_respages[pn]);
2261                 resp->rqstp->rq_vec[v].iov_len =
2262                         len < PAGE_SIZE ? len : PAGE_SIZE;
2263                 v++;
2264                 len -= PAGE_SIZE;
2265         }
2266         read->rd_vlen = v;
2267
2268         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2269                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2270                         &maxcount);
2271
2272         if (nfserr == nfserr_symlink)
2273                 nfserr = nfserr_inval;
2274         if (nfserr)
2275                 return nfserr;
2276         eof = (read->rd_offset + maxcount >=
2277                read->rd_fhp->fh_dentry->d_inode->i_size);
2278
2279         WRITE32(eof);
2280         WRITE32(maxcount);
2281         ADJUST_ARGS();
2282         resp->xbuf->head[0].iov_len = (char*)p
2283                                         - (char*)resp->xbuf->head[0].iov_base;
2284         resp->xbuf->page_len = maxcount;
2285
2286         /* Use rest of head for padding and remaining ops: */
2287         resp->xbuf->tail[0].iov_base = p;
2288         resp->xbuf->tail[0].iov_len = 0;
2289         if (maxcount&3) {
2290                 RESERVE_SPACE(4);
2291                 WRITE32(0);
2292                 resp->xbuf->tail[0].iov_base += maxcount&3;
2293                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2294                 ADJUST_ARGS();
2295         }
2296         return 0;
2297 }
2298
2299 static __be32
2300 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2301 {
2302         int maxcount;
2303         char *page;
2304         ENCODE_HEAD;
2305
2306         if (nfserr)
2307                 return nfserr;
2308         if (resp->xbuf->page_len)
2309                 return nfserr_resource;
2310
2311         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2312
2313         maxcount = PAGE_SIZE;
2314         RESERVE_SPACE(4);
2315
2316         /*
2317          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2318          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2319          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2320          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2321          */
2322         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2323         if (nfserr == nfserr_isdir)
2324                 return nfserr_inval;
2325         if (nfserr)
2326                 return nfserr;
2327
2328         WRITE32(maxcount);
2329         ADJUST_ARGS();
2330         resp->xbuf->head[0].iov_len = (char*)p
2331                                 - (char*)resp->xbuf->head[0].iov_base;
2332         resp->xbuf->page_len = maxcount;
2333
2334         /* Use rest of head for padding and remaining ops: */
2335         resp->xbuf->tail[0].iov_base = p;
2336         resp->xbuf->tail[0].iov_len = 0;
2337         if (maxcount&3) {
2338                 RESERVE_SPACE(4);
2339                 WRITE32(0);
2340                 resp->xbuf->tail[0].iov_base += maxcount&3;
2341                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2342                 ADJUST_ARGS();
2343         }
2344         return 0;
2345 }
2346
2347 static __be32
2348 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2349 {
2350         int maxcount;
2351         loff_t offset;
2352         __be32 *page, *savep, *tailbase;
2353         ENCODE_HEAD;
2354
2355         if (nfserr)
2356                 return nfserr;
2357         if (resp->xbuf->page_len)
2358                 return nfserr_resource;
2359
2360         RESERVE_SPACE(8);  /* verifier */
2361         savep = p;
2362
2363         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2364         WRITE32(0);
2365         WRITE32(0);
2366         ADJUST_ARGS();
2367         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2368         tailbase = p;
2369
2370         maxcount = PAGE_SIZE;
2371         if (maxcount > readdir->rd_maxcount)
2372                 maxcount = readdir->rd_maxcount;
2373
2374         /*
2375          * Convert from bytes to words, account for the two words already
2376          * written, make sure to leave two words at the end for the next
2377          * pointer and eof field.
2378          */
2379         maxcount = (maxcount >> 2) - 4;
2380         if (maxcount < 0) {
2381                 nfserr =  nfserr_toosmall;
2382                 goto err_no_verf;
2383         }
2384
2385         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2386         readdir->common.err = 0;
2387         readdir->buflen = maxcount;
2388         readdir->buffer = page;
2389         readdir->offset = NULL;
2390
2391         offset = readdir->rd_cookie;
2392         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2393                               &offset,
2394                               &readdir->common, nfsd4_encode_dirent);
2395         if (nfserr == nfs_ok &&
2396             readdir->common.err == nfserr_toosmall &&
2397             readdir->buffer == page)
2398                 nfserr = nfserr_toosmall;
2399         if (nfserr == nfserr_symlink)
2400                 nfserr = nfserr_notdir;
2401         if (nfserr)
2402                 goto err_no_verf;
2403
2404         if (readdir->offset)
2405                 xdr_encode_hyper(readdir->offset, offset);
2406
2407         p = readdir->buffer;
2408         *p++ = 0;       /* no more entries */
2409         *p++ = htonl(readdir->common.err == nfserr_eof);
2410         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2411                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2412
2413         /* Use rest of head for padding and remaining ops: */
2414         resp->xbuf->tail[0].iov_base = tailbase;
2415         resp->xbuf->tail[0].iov_len = 0;
2416         resp->p = resp->xbuf->tail[0].iov_base;
2417         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2418
2419         return 0;
2420 err_no_verf:
2421         p = savep;
2422         ADJUST_ARGS();
2423         return nfserr;
2424 }
2425
2426 static void
2427 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2428 {
2429         ENCODE_HEAD;
2430
2431         if (!nfserr) {
2432                 RESERVE_SPACE(20);
2433                 WRITECINFO(remove->rm_cinfo);
2434                 ADJUST_ARGS();
2435         }
2436 }
2437
2438 static void
2439 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2440 {
2441         ENCODE_HEAD;
2442
2443         if (!nfserr) {
2444                 RESERVE_SPACE(40);
2445                 WRITECINFO(rename->rn_sinfo);
2446                 WRITECINFO(rename->rn_tinfo);
2447                 ADJUST_ARGS();
2448         }
2449 }
2450
2451 static void
2452 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, int nfserr,
2453                      struct nfsd4_secinfo *secinfo)
2454 {
2455         int i = 0;
2456         struct svc_export *exp = secinfo->si_exp;
2457         ENCODE_HEAD;
2458
2459         if (nfserr)
2460                 goto out;
2461         RESERVE_SPACE(4);
2462         WRITE32(exp->ex_nflavors);
2463         ADJUST_ARGS();
2464         for (i = 0; i < exp->ex_nflavors; i++) {
2465                 u32 flav = exp->ex_flavors[i].pseudoflavor;
2466                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2467
2468                 if (gm) {
2469                         RESERVE_SPACE(4);
2470                         WRITE32(RPC_AUTH_GSS);
2471                         ADJUST_ARGS();
2472                         RESERVE_SPACE(4 + gm->gm_oid.len);
2473                         WRITE32(gm->gm_oid.len);
2474                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2475                         ADJUST_ARGS();
2476                         RESERVE_SPACE(4);
2477                         WRITE32(0); /* qop */
2478                         ADJUST_ARGS();
2479                         RESERVE_SPACE(4);
2480                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2481                         ADJUST_ARGS();
2482                         gss_mech_put(gm);
2483                 } else {
2484                         RESERVE_SPACE(4);
2485                         WRITE32(flav);
2486                         ADJUST_ARGS();
2487                 }
2488         }
2489 out:
2490         if (exp)
2491                 exp_put(exp);
2492 }
2493
2494 /*
2495  * The SETATTR encode routine is special -- it always encodes a bitmap,
2496  * regardless of the error status.
2497  */
2498 static void
2499 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2500 {
2501         ENCODE_HEAD;
2502
2503         RESERVE_SPACE(12);
2504         if (nfserr) {
2505                 WRITE32(2);
2506                 WRITE32(0);
2507                 WRITE32(0);
2508         }
2509         else {
2510                 WRITE32(2);
2511                 WRITE32(setattr->sa_bmval[0]);
2512                 WRITE32(setattr->sa_bmval[1]);
2513         }
2514         ADJUST_ARGS();
2515 }
2516
2517 static void
2518 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2519 {
2520         ENCODE_HEAD;
2521
2522         if (!nfserr) {
2523                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2524                 WRITEMEM(&scd->se_clientid, 8);
2525                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2526                 ADJUST_ARGS();
2527         }
2528         else if (nfserr == nfserr_clid_inuse) {
2529                 RESERVE_SPACE(8);
2530                 WRITE32(0);
2531                 WRITE32(0);
2532                 ADJUST_ARGS();
2533         }
2534 }
2535
2536 static void
2537 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2538 {
2539         ENCODE_HEAD;
2540
2541         if (!nfserr) {
2542                 RESERVE_SPACE(16);
2543                 WRITE32(write->wr_bytes_written);
2544                 WRITE32(write->wr_how_written);
2545                 WRITEMEM(write->wr_verifier.data, 8);
2546                 ADJUST_ARGS();
2547         }
2548 }
2549
2550 void
2551 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2552 {
2553         __be32 *statp;
2554         ENCODE_HEAD;
2555
2556         RESERVE_SPACE(8);
2557         WRITE32(op->opnum);
2558         statp = p++;    /* to be backfilled at the end */
2559         ADJUST_ARGS();
2560
2561         switch (op->opnum) {
2562         case OP_ACCESS:
2563                 nfsd4_encode_access(resp, op->status, &op->u.access);
2564                 break;
2565         case OP_CLOSE:
2566                 nfsd4_encode_close(resp, op->status, &op->u.close);
2567                 break;
2568         case OP_COMMIT:
2569                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2570                 break;
2571         case OP_CREATE:
2572                 nfsd4_encode_create(resp, op->status, &op->u.create);
2573                 break;
2574         case OP_DELEGRETURN:
2575                 break;
2576         case OP_GETATTR:
2577                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2578                 break;
2579         case OP_GETFH:
2580                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2581                 break;
2582         case OP_LINK:
2583                 nfsd4_encode_link(resp, op->status, &op->u.link);
2584                 break;
2585         case OP_LOCK:
2586                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2587                 break;
2588         case OP_LOCKT:
2589                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2590                 break;
2591         case OP_LOCKU:
2592                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2593                 break;
2594         case OP_LOOKUP:
2595                 break;
2596         case OP_LOOKUPP:
2597                 break;
2598         case OP_NVERIFY:
2599                 break;
2600         case OP_OPEN:
2601                 nfsd4_encode_open(resp, op->status, &op->u.open);
2602                 break;
2603         case OP_OPEN_CONFIRM:
2604                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2605                 break;
2606         case OP_OPEN_DOWNGRADE:
2607                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2608                 break;
2609         case OP_PUTFH:
2610                 break;
2611         case OP_PUTROOTFH:
2612                 break;
2613         case OP_READ:
2614                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2615                 break;
2616         case OP_READDIR:
2617                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2618                 break;
2619         case OP_READLINK:
2620                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2621                 break;
2622         case OP_REMOVE:
2623                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2624                 break;
2625         case OP_RENAME:
2626                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2627                 break;
2628         case OP_RENEW:
2629                 break;
2630         case OP_RESTOREFH:
2631                 break;
2632         case OP_SAVEFH:
2633                 break;
2634         case OP_SECINFO:
2635                 nfsd4_encode_secinfo(resp, op->status, &op->u.secinfo);
2636                 break;
2637         case OP_SETATTR:
2638                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2639                 break;
2640         case OP_SETCLIENTID:
2641                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2642                 break;
2643         case OP_SETCLIENTID_CONFIRM:
2644                 break;
2645         case OP_VERIFY:
2646                 break;
2647         case OP_WRITE:
2648                 nfsd4_encode_write(resp, op->status, &op->u.write);
2649                 break;
2650         case OP_RELEASE_LOCKOWNER:
2651                 break;
2652         default:
2653                 break;
2654         }
2655
2656         /*
2657          * Note: We write the status directly, instead of using WRITE32(),
2658          * since it is already in network byte order.
2659          */
2660         *statp = op->status;
2661 }
2662
2663 /*
2664  * Encode the reply stored in the stateowner reply cache
2665  *
2666  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2667  * previously sent already encoded operation.
2668  *
2669  * called with nfs4_lock_state() held
2670  */
2671 void
2672 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2673 {
2674         ENCODE_HEAD;
2675         struct nfs4_replay *rp = op->replay;
2676
2677         BUG_ON(!rp);
2678
2679         RESERVE_SPACE(8);
2680         WRITE32(op->opnum);
2681         *p++ = rp->rp_status;  /* already xdr'ed */
2682         ADJUST_ARGS();
2683
2684         RESERVE_SPACE(rp->rp_buflen);
2685         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2686         ADJUST_ARGS();
2687 }
2688
2689 /*
2690  * END OF "GENERIC" ENCODE ROUTINES.
2691  */
2692
2693 int
2694 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2695 {
2696         return xdr_ressize_check(rqstp, p);
2697 }
2698
2699 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2700 {
2701         if (args->ops != args->iops) {
2702                 kfree(args->ops);
2703                 args->ops = args->iops;
2704         }
2705         kfree(args->tmpp);
2706         args->tmpp = NULL;
2707         while (args->to_free) {
2708                 struct tmpbuf *tb = args->to_free;
2709                 args->to_free = tb->next;
2710                 tb->release(tb->buf);
2711                 kfree(tb);
2712         }
2713 }
2714
2715 int
2716 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2717 {
2718         __be32 status;
2719
2720         args->p = p;
2721         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2722         args->pagelist = rqstp->rq_arg.pages;
2723         args->pagelen = rqstp->rq_arg.page_len;
2724         args->tmpp = NULL;
2725         args->to_free = NULL;
2726         args->ops = args->iops;
2727         args->rqstp = rqstp;
2728
2729         status = nfsd4_decode_compound(args);
2730         if (status) {
2731                 nfsd4_release_compoundargs(args);
2732         }
2733         return !status;
2734 }
2735
2736 int
2737 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2738 {
2739         /*
2740          * All that remains is to write the tag and operation count...
2741          */
2742         struct kvec *iov;
2743         p = resp->tagp;
2744         *p++ = htonl(resp->taglen);
2745         memcpy(p, resp->tag, resp->taglen);
2746         p += XDR_QUADLEN(resp->taglen);
2747         *p++ = htonl(resp->opcnt);
2748
2749         if (rqstp->rq_res.page_len)
2750                 iov = &rqstp->rq_res.tail[0];
2751         else
2752                 iov = &rqstp->rq_res.head[0];
2753         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2754         BUG_ON(iov->iov_len > PAGE_SIZE);
2755         return 1;
2756 }
2757
2758 /*
2759  * Local variables:
2760  *  c-basic-offset: 8
2761  * End:
2762  */