git.oblomov.eu Git - linux-2.6/blob - fs/nfsd/nfs4xdr.c

   1 /*
   2  *  fs/nfs/nfs4xdr.c
   3  *
   4  *  Server-side XDR for NFSv4
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * TODO: Neil Brown made the following observation:  We currently
  38  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  39  * never release any of that until the request is complete.
  40  * It would be good to calculate a new maximum response size while
  41  * decoding the COMPOUND, and call svc_reserve with this number
  42  * at the end of nfs4svc_decode_compoundargs.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/smp.h>
  47 #include <linux/smp_lock.h>
  48 #include <linux/fs.h>
  49 #include <linux/namei.h>
  50 #include <linux/vfs.h>
  51 #include <linux/sunrpc/xdr.h>
  52 #include <linux/sunrpc/svc.h>
  53 #include <linux/sunrpc/clnt.h>
  54 #include <linux/nfsd/nfsd.h>
  55 #include <linux/nfsd/state.h>
  56 #include <linux/nfsd/xdr4.h>
  57 #include <linux/nfsd_idmap.h>
  58 #include <linux/nfs4.h>
  59 #include <linux/nfs4_acl.h>
  60
  61 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  62
  63 /*
  64  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  65  * directory in order to indicate to the client that a filesystem boundary is present
  66  * We use a fixed fsid for a referral
  67  */
  68 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  69 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  70
  71 static __be32
  72 check_filename(char *str, int len, __be32 err)
  73 {
  74         int i;
  75
  76         if (len == 0)
  77                 return nfserr_inval;
  78         if (isdotent(str, len))
  79                 return err;
  80         for (i = 0; i < len; i++)
  81                 if (str[i] == '/')
  82                         return err;
  83         return 0;
  84 }
  85
  86 /*
  87  * START OF "GENERIC" DECODE ROUTINES.
  88  *   These may look a little ugly since they are imported from a "generic"
  89  * set of XDR encode/decode routines which are intended to be shared by
  90  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  91  *
  92  * If the pain of reading these is too great, it should be a straightforward
  93  * task to translate them into Linux-specific versions which are more
  94  * consistent with the style used in NFSv2/v3...
  95  */
  96 #define DECODE_HEAD                             \
  97         __be32 *p;                              \
  98         __be32 status
  99 #define DECODE_TAIL                             \
 100         status = 0;                             \
 101 out:                                            \
 102         return status;                          \
 103 xdr_error:                                      \
 104         printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 105         status = nfserr_bad_xdr;                \
 106         goto out
 107
 108 #define READ32(x)         (x) = ntohl(*p++)
 109 #define READ64(x)         do {                  \
 110         (x) = (u64)ntohl(*p++) << 32;           \
 111         (x) |= ntohl(*p++);                     \
 112 } while (0)
 113 #define READTIME(x)       do {                  \
 114         p++;                                    \
 115         (x) = ntohl(*p++);                      \
 116         p++;                                    \
 117 } while (0)
 118 #define READMEM(x,nbytes) do {                  \
 119         x = (char *)p;                          \
 120         p += XDR_QUADLEN(nbytes);               \
 121 } while (0)
 122 #define SAVEMEM(x,nbytes) do {                  \
 123         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 124                 savemem(argp, p, nbytes) :      \
 125                 (char *)p)) {                   \
 126                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 127                 goto xdr_error;                 \
 128                 }                               \
 129         p += XDR_QUADLEN(nbytes);               \
 130 } while (0)
 131 #define COPYMEM(x,nbytes) do {                  \
 132         memcpy((x), p, nbytes);                 \
 133         p += XDR_QUADLEN(nbytes);               \
 134 } while (0)
 135
 136 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 137 #define READ_BUF(nbytes)  do {                  \
 138         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 139                 p = argp->p;                    \
 140                 argp->p += XDR_QUADLEN(nbytes); \
 141         } else if (!(p = read_buf(argp, nbytes))) { \
 142                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 143                 goto xdr_error;                 \
 144         }                                       \
 145 } while (0)
 146
 147 static __be32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
 148 {
 149         /* We want more bytes than seem to be available.
 150          * Maybe we need a new page, maybe we have just run out
 151          */
 152         int avail = (char*)argp->end - (char*)argp->p;
 153         __be32 *p;
 154         if (avail + argp->pagelen < nbytes)
 155                 return NULL;
 156         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 157                 return NULL;
 158         /* ok, we can do it with the current plus the next page */
 159         if (nbytes <= sizeof(argp->tmp))
 160                 p = argp->tmp;
 161         else {
 162                 kfree(argp->tmpp);
 163                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 164                 if (!p)
 165                         return NULL;
 166
 167         }
 168         memcpy(p, argp->p, avail);
 169         /* step to next page */
 170         argp->p = page_address(argp->pagelist[0]);
 171         argp->pagelist++;
 172         if (argp->pagelen < PAGE_SIZE) {
 173                 argp->end = p + (argp->pagelen>>2);
 174                 argp->pagelen = 0;
 175         } else {
 176                 argp->end = p + (PAGE_SIZE>>2);
 177                 argp->pagelen -= PAGE_SIZE;
 178         }
 179         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 180         argp->p += XDR_QUADLEN(nbytes - avail);
 181         return p;
 182 }
 183
 184 static int
 185 defer_free(struct nfsd4_compoundargs *argp,
 186                 void (*release)(const void *), void *p)
 187 {
 188         struct tmpbuf *tb;
 189
 190         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 191         if (!tb)
 192                 return -ENOMEM;
 193         tb->buf = p;
 194         tb->release = release;
 195         tb->next = argp->to_free;
 196         argp->to_free = tb;
 197         return 0;
 198 }
 199
 200 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 201 {
 202         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_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 824 {
 825         DECODE_HEAD;
 826
 827         READ_BUF(sizeof(stateid_t));
 828         READ32(setattr->sa_stateid.si_generation);
 829         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 830         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 831                 goto out;
 832
 833         DECODE_TAIL;
 834 }
 835
 836 static __be32
 837 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 838 {
 839         DECODE_HEAD;
 840
 841         READ_BUF(12);
 842         COPYMEM(setclientid->se_verf.data, 8);
 843         READ32(setclientid->se_namelen);
 844
 845         READ_BUF(setclientid->se_namelen + 8);
 846         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 847         READ32(setclientid->se_callback_prog);
 848         READ32(setclientid->se_callback_netid_len);
 849
 850         READ_BUF(setclientid->se_callback_netid_len + 4);
 851         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 852         READ32(setclientid->se_callback_addr_len);
 853
 854         READ_BUF(setclientid->se_callback_addr_len + 4);
 855         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 856         READ32(setclientid->se_callback_ident);
 857
 858         DECODE_TAIL;
 859 }
 860
 861 static __be32
 862 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 863 {
 864         DECODE_HEAD;
 865
 866         READ_BUF(8 + sizeof(nfs4_verifier));
 867         COPYMEM(&scd_c->sc_clientid, 8);
 868         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 869
 870         DECODE_TAIL;
 871 }
 872
 873 /* Also used for NVERIFY */
 874 static __be32
 875 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 876 {
 877 #if 0
 878         struct nfsd4_compoundargs save = {
 879                 .p = argp->p,
 880                 .end = argp->end,
 881                 .rqstp = argp->rqstp,
 882         };
 883         u32             ve_bmval[2];
 884         struct iattr    ve_iattr;           /* request */
 885         struct nfs4_acl *ve_acl;            /* request */
 886 #endif
 887         DECODE_HEAD;
 888
 889         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 890                 goto out;
 891
 892         /* For convenience's sake, we compare raw xdr'd attributes in
 893          * nfsd4_proc_verify; however we still decode here just to return
 894          * correct error in case of bad xdr. */
 895 #if 0
 896         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 897         if (status == nfserr_inval) {
 898                 status = nfserrno(status);
 899                 goto out;
 900         }
 901 #endif
 902         READ_BUF(4);
 903         READ32(verify->ve_attrlen);
 904         READ_BUF(verify->ve_attrlen);
 905         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 906
 907         DECODE_TAIL;
 908 }
 909
 910 static __be32
 911 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 912 {
 913         int avail;
 914         int v;
 915         int len;
 916         DECODE_HEAD;
 917
 918         READ_BUF(sizeof(stateid_opaque_t) + 20);
 919         READ32(write->wr_stateid.si_generation);
 920         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
 921         READ64(write->wr_offset);
 922         READ32(write->wr_stable_how);
 923         if (write->wr_stable_how > 2)
 924                 goto xdr_error;
 925         READ32(write->wr_buflen);
 926
 927         /* Sorry .. no magic macros for this.. *
 928          * READ_BUF(write->wr_buflen);
 929          * SAVEMEM(write->wr_buf, write->wr_buflen);
 930          */
 931         avail = (char*)argp->end - (char*)argp->p;
 932         if (avail + argp->pagelen < write->wr_buflen) {
 933                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__);
 934                 goto xdr_error;
 935         }
 936         argp->rqstp->rq_vec[0].iov_base = p;
 937         argp->rqstp->rq_vec[0].iov_len = avail;
 938         v = 0;
 939         len = write->wr_buflen;
 940         while (len > argp->rqstp->rq_vec[v].iov_len) {
 941                 len -= argp->rqstp->rq_vec[v].iov_len;
 942                 v++;
 943                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 944                 argp->pagelist++;
 945                 if (argp->pagelen >= PAGE_SIZE) {
 946                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 947                         argp->pagelen -= PAGE_SIZE;
 948                 } else {
 949                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 950                         argp->pagelen -= len;
 951                 }
 952         }
 953         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 954         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 955         argp->rqstp->rq_vec[v].iov_len = len;
 956         write->wr_vlen = v+1;
 957
 958         DECODE_TAIL;
 959 }
 960
 961 static __be32
 962 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 963 {
 964         DECODE_HEAD;
 965
 966         READ_BUF(12);
 967         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 968         READ32(rlockowner->rl_owner.len);
 969         READ_BUF(rlockowner->rl_owner.len);
 970         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 971
 972         DECODE_TAIL;
 973 }
 974
 975 static __be32
 976 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 977 {
 978         DECODE_HEAD;
 979         struct nfsd4_op *op;
 980         int i;
 981
 982         /*
 983          * XXX: According to spec, we should check the tag
 984          * for UTF-8 compliance.  I'm postponing this for
 985          * now because it seems that some clients do use
 986          * binary tags.
 987          */
 988         READ_BUF(4);
 989         READ32(argp->taglen);
 990         READ_BUF(argp->taglen + 8);
 991         SAVEMEM(argp->tag, argp->taglen);
 992         READ32(argp->minorversion);
 993         READ32(argp->opcnt);
 994
 995         if (argp->taglen > NFSD4_MAX_TAGLEN)
 996                 goto xdr_error;
 997         if (argp->opcnt > 100)
 998                 goto xdr_error;
 999
1000         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1001                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1002                 if (!argp->ops) {
1003                         argp->ops = argp->iops;
1004                         printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
1005                         goto xdr_error;
1006                 }
1007         }
1008
1009         for (i = 0; i < argp->opcnt; i++) {
1010                 op = &argp->ops[i];
1011                 op->replay = NULL;
1012
1013                 /*
1014                  * We can't use READ_BUF() here because we need to handle
1015                  * a missing opcode as an OP_WRITE + 1. So we need to check
1016                  * to see if we're truly at the end of our buffer or if there
1017                  * is another page we need to flip to.
1018                  */
1019
1020                 if (argp->p == argp->end) {
1021                         if (argp->pagelen < 4) {
1022                                 /* There isn't an opcode still on the wire */
1023                                 op->opnum = OP_WRITE + 1;
1024                                 op->status = nfserr_bad_xdr;
1025                                 argp->opcnt = i+1;
1026                                 break;
1027                         }
1028
1029                         /*
1030                          * False alarm. We just hit a page boundary, but there
1031                          * is still data available.  Move pointer across page
1032                          * boundary.  *snip from READ_BUF*
1033                          */
1034                         argp->p = page_address(argp->pagelist[0]);
1035                         argp->pagelist++;
1036                         if (argp->pagelen < PAGE_SIZE) {
1037                                 argp->end = p + (argp->pagelen>>2);
1038                                 argp->pagelen = 0;
1039                         } else {
1040                                 argp->end = p + (PAGE_SIZE>>2);
1041                                 argp->pagelen -= PAGE_SIZE;
1042                         }
1043                 }
1044                 op->opnum = ntohl(*argp->p++);
1045
1046                 switch (op->opnum) {
1047                 case 2: /* Reserved operation */
1048                         op->opnum = OP_ILLEGAL;
1049                         if (argp->minorversion == 0)
1050                                 op->status = nfserr_op_illegal;
1051                         else
1052                                 op->status = nfserr_minor_vers_mismatch;
1053                         break;
1054                 case OP_ACCESS:
1055                         op->status = nfsd4_decode_access(argp, &op->u.access);
1056                         break;
1057                 case OP_CLOSE:
1058                         op->status = nfsd4_decode_close(argp, &op->u.close);
1059                         break;
1060                 case OP_COMMIT:
1061                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1062                         break;
1063                 case OP_CREATE:
1064                         op->status = nfsd4_decode_create(argp, &op->u.create);
1065                         break;
1066                 case OP_DELEGRETURN:
1067                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1068                         break;
1069                 case OP_GETATTR:
1070                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1071                         break;
1072                 case OP_GETFH:
1073                         op->status = nfs_ok;
1074                         break;
1075                 case OP_LINK:
1076                         op->status = nfsd4_decode_link(argp, &op->u.link);
1077                         break;
1078                 case OP_LOCK:
1079                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1080                         break;
1081                 case OP_LOCKT:
1082                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1083                         break;
1084                 case OP_LOCKU:
1085                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1086                         break;
1087                 case OP_LOOKUP:
1088                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1089                         break;
1090                 case OP_LOOKUPP:
1091                         op->status = nfs_ok;
1092                         break;
1093                 case OP_NVERIFY:
1094                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1095                         break;
1096                 case OP_OPEN:
1097                         op->status = nfsd4_decode_open(argp, &op->u.open);
1098                         break;
1099                 case OP_OPEN_CONFIRM:
1100                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1101                         break;
1102                 case OP_OPEN_DOWNGRADE:
1103                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1104                         break;
1105                 case OP_PUTFH:
1106                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1107                         break;
1108                 case OP_PUTROOTFH:
1109                         op->status = nfs_ok;
1110                         break;
1111                 case OP_READ:
1112                         op->status = nfsd4_decode_read(argp, &op->u.read);
1113                         break;
1114                 case OP_READDIR:
1115                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1116                         break;
1117                 case OP_READLINK:
1118                         op->status = nfs_ok;
1119                         break;
1120                 case OP_REMOVE:
1121                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1122                         break;
1123                 case OP_RENAME:
1124                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1125                         break;
1126                 case OP_RESTOREFH:
1127                         op->status = nfs_ok;
1128                         break;
1129                 case OP_RENEW:
1130                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1131                         break;
1132                 case OP_SAVEFH:
1133                         op->status = nfs_ok;
1134                         break;
1135                 case OP_SETATTR:
1136                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1137                         break;
1138                 case OP_SETCLIENTID:
1139                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1140                         break;
1141                 case OP_SETCLIENTID_CONFIRM:
1142                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1143                         break;
1144                 case OP_VERIFY:
1145                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1146                         break;
1147                 case OP_WRITE:
1148                         op->status = nfsd4_decode_write(argp, &op->u.write);
1149                         break;
1150                 case OP_RELEASE_LOCKOWNER:
1151                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1152                         break;
1153                 default:
1154                         op->opnum = OP_ILLEGAL;
1155                         op->status = nfserr_op_illegal;
1156                         break;
1157                 }
1158
1159                 if (op->status) {
1160                         argp->opcnt = i+1;
1161                         break;
1162                 }
1163         }
1164
1165         DECODE_TAIL;
1166 }
1167 /*
1168  * END OF "GENERIC" DECODE ROUTINES.
1169  */
1170
1171 /*
1172  * START OF "GENERIC" ENCODE ROUTINES.
1173  *   These may look a little ugly since they are imported from a "generic"
1174  * set of XDR encode/decode routines which are intended to be shared by
1175  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1176  *
1177  * If the pain of reading these is too great, it should be a straightforward
1178  * task to translate them into Linux-specific versions which are more
1179  * consistent with the style used in NFSv2/v3...
1180  */
1181 #define ENCODE_HEAD              __be32 *p
1182
1183 #define WRITE32(n)               *p++ = htonl(n)
1184 #define WRITE64(n)               do {                           \
1185         *p++ = htonl((u32)((n) >> 32));                         \
1186         *p++ = htonl((u32)(n));                                 \
1187 } while (0)
1188 #define WRITEMEM(ptr,nbytes)     do {                           \
1189         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1190         memcpy(p, ptr, nbytes);                                 \
1191         p += XDR_QUADLEN(nbytes);                               \
1192 } while (0)
1193 #define WRITECINFO(c)           do {                            \
1194         *p++ = htonl(c.atomic);                                 \
1195         *p++ = htonl(c.before_ctime_sec);                               \
1196         *p++ = htonl(c.before_ctime_nsec);                              \
1197         *p++ = htonl(c.after_ctime_sec);                                \
1198         *p++ = htonl(c.after_ctime_nsec);                               \
1199 } while (0)
1200
1201 #define RESERVE_SPACE(nbytes)   do {                            \
1202         p = resp->p;                                            \
1203         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1204 } while (0)
1205 #define ADJUST_ARGS()           resp->p = p
1206
1207 /*
1208  * Header routine to setup seqid operation replay cache
1209  */
1210 #define ENCODE_SEQID_OP_HEAD                                    \
1211         __be32 *p;                                              \
1212         __be32 *save;                                           \
1213                                                                 \
1214         save = resp->p;
1215
1216 /*
1217  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1218  * is where sequence id's are incremented, and the replay cache is filled.
1219  * Note that we increment sequence id's here, at the last moment, so we're sure
1220  * we know whether the error to be returned is a sequence id mutating error.
1221  */
1222
1223 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1224         if (seqid_mutating_err(nfserr) && stateowner) {         \
1225                 stateowner->so_seqid++;                         \
1226                 stateowner->so_replay.rp_status = nfserr;       \
1227                 stateowner->so_replay.rp_buflen =               \
1228                           (((char *)(resp)->p - (char *)save)); \
1229                 memcpy(stateowner->so_replay.rp_buf, save,      \
1230                         stateowner->so_replay.rp_buflen);       \
1231         } } while (0);
1232
1233 /* Encode as an array of strings the string given with components
1234  * seperated @sep.
1235  */
1236 static __be32 nfsd4_encode_components(char sep, char *components,
1237                                    __be32 **pp, int *buflen)
1238 {
1239         __be32 *p = *pp;
1240         __be32 *countp = p;
1241         int strlen, count=0;
1242         char *str, *end;
1243
1244         dprintk("nfsd4_encode_components(%s)\n", components);
1245         if ((*buflen -= 4) < 0)
1246                 return nfserr_resource;
1247         WRITE32(0); /* We will fill this in with @count later */
1248         end = str = components;
1249         while (*end) {
1250                 for (; *end && (*end != sep); end++)
1251                         ; /* Point to end of component */
1252                 strlen = end - str;
1253                 if (strlen) {
1254                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1255                                 return nfserr_resource;
1256                         WRITE32(strlen);
1257                         WRITEMEM(str, strlen);
1258                         count++;
1259                 }
1260                 else
1261                         end++;
1262                 str = end;
1263         }
1264         *pp = p;
1265         p = countp;
1266         WRITE32(count);
1267         return 0;
1268 }
1269
1270 /*
1271  * encode a location element of a fs_locations structure
1272  */
1273 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1274                                     __be32 **pp, int *buflen)
1275 {
1276         __be32 status;
1277         __be32 *p = *pp;
1278
1279         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1280         if (status)
1281                 return status;
1282         status = nfsd4_encode_components('/', location->path, &p, buflen);
1283         if (status)
1284                 return status;
1285         *pp = p;
1286         return 0;
1287 }
1288
1289 /*
1290  * Return the path to an export point in the pseudo filesystem namespace
1291  * Returned string is safe to use as long as the caller holds a reference
1292  * to @exp.
1293  */
1294 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1295 {
1296         struct svc_fh tmp_fh;
1297         char *path, *rootpath;
1298
1299         fh_init(&tmp_fh, NFS4_FHSIZE);
1300         *stat = exp_pseudoroot(rqstp->rq_client, &tmp_fh, &rqstp->rq_chandle);
1301         if (*stat)
1302                 return NULL;
1303         rootpath = tmp_fh.fh_export->ex_path;
1304
1305         path = exp->ex_path;
1306
1307         if (strncmp(path, rootpath, strlen(rootpath))) {
1308                 printk("nfsd: fs_locations failed;"
1309                         "%s is not contained in %s\n", path, rootpath);
1310                 *stat = nfserr_notsupp;
1311                 return NULL;
1312         }
1313
1314         return path + strlen(rootpath);
1315 }
1316
1317 /*
1318  *  encode a fs_locations structure
1319  */
1320 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1321                                      struct svc_export *exp,
1322                                      __be32 **pp, int *buflen)
1323 {
1324         __be32 status;
1325         int i;
1326         __be32 *p = *pp;
1327         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1328         char *root = nfsd4_path(rqstp, exp, &status);
1329
1330         if (status)
1331                 return status;
1332         status = nfsd4_encode_components('/', root, &p, buflen);
1333         if (status)
1334                 return status;
1335         if ((*buflen -= 4) < 0)
1336                 return nfserr_resource;
1337         WRITE32(fslocs->locations_count);
1338         for (i=0; i<fslocs->locations_count; i++) {
1339                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1340                                                    &p, buflen);
1341                 if (status)
1342                         return status;
1343         }
1344         *pp = p;
1345         return 0;
1346 }
1347
1348 static u32 nfs4_ftypes[16] = {
1349         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1350         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1351         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1352         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1353 };
1354
1355 static __be32
1356 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1357                         __be32 **p, int *buflen)
1358 {
1359         int status;
1360
1361         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1362                 return nfserr_resource;
1363         if (whotype != NFS4_ACL_WHO_NAMED)
1364                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1365         else if (group)
1366                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1367         else
1368                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1369         if (status < 0)
1370                 return nfserrno(status);
1371         *p = xdr_encode_opaque(*p, NULL, status);
1372         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1373         BUG_ON(*buflen < 0);
1374         return 0;
1375 }
1376
1377 static inline __be32
1378 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1379 {
1380         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1381 }
1382
1383 static inline __be32
1384 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1385 {
1386         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1387 }
1388
1389 static inline __be32
1390 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1391                 __be32 **p, int *buflen)
1392 {
1393         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1394 }
1395
1396 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1397                               FATTR4_WORD0_RDATTR_ERROR)
1398 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1399
1400 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1401 {
1402         /* As per referral draft:  */
1403         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1404             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1405                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1406                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1407                         *rdattr_err = NFSERR_MOVED;
1408                 else
1409                         return nfserr_moved;
1410         }
1411         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1412         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1413         return 0;
1414 }
1415
1416 /*
1417  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1418  * ourselves.
1419  *
1420  * @countp is the buffer size in _words_; upon successful return this becomes
1421  * replaced with the number of words written.
1422  */
1423 __be32
1424 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1425                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1426                 struct svc_rqst *rqstp)
1427 {
1428         u32 bmval0 = bmval[0];
1429         u32 bmval1 = bmval[1];
1430         struct kstat stat;
1431         struct svc_fh tempfh;
1432         struct kstatfs statfs;
1433         int buflen = *countp << 2;
1434         __be32 *attrlenp;
1435         u32 dummy;
1436         u64 dummy64;
1437         u32 rdattr_err = 0;
1438         __be32 *p = buffer;
1439         __be32 status;
1440         int err;
1441         int aclsupport = 0;
1442         struct nfs4_acl *acl = NULL;
1443
1444         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1445         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1446         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1447
1448         if (exp->ex_fslocs.migrated) {
1449                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1450                 if (status)
1451                         goto out;
1452         }
1453
1454         err = vfs_getattr(exp->ex_mnt, dentry, &stat);
1455         if (err)
1456                 goto out_nfserr;
1457         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1458             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1459                        FATTR4_WORD1_SPACE_TOTAL))) {
1460                 err = vfs_statfs(dentry, &statfs);
1461                 if (err)
1462                         goto out_nfserr;
1463         }
1464         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1465                 fh_init(&tempfh, NFS4_FHSIZE);
1466                 status = fh_compose(&tempfh, exp, dentry, NULL);
1467                 if (status)
1468                         goto out;
1469                 fhp = &tempfh;
1470         }
1471         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1472                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1473                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1474                 aclsupport = (err == 0);
1475                 if (bmval0 & FATTR4_WORD0_ACL) {
1476                         if (err == -EOPNOTSUPP)
1477                                 bmval0 &= ~FATTR4_WORD0_ACL;
1478                         else if (err == -EINVAL) {
1479                                 status = nfserr_attrnotsupp;
1480                                 goto out;
1481                         } else if (err != 0)
1482                                 goto out_nfserr;
1483                 }
1484         }
1485         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1486                 if (exp->ex_fslocs.locations == NULL) {
1487                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1488                 }
1489         }
1490         if ((buflen -= 16) < 0)
1491                 goto out_resource;
1492
1493         WRITE32(2);
1494         WRITE32(bmval0);
1495         WRITE32(bmval1);
1496         attrlenp = p++;                /* to be backfilled later */
1497
1498         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1499                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1500                 if ((buflen -= 12) < 0)
1501                         goto out_resource;
1502                 if (!aclsupport)
1503                         word0 &= ~FATTR4_WORD0_ACL;
1504                 if (!exp->ex_fslocs.locations)
1505                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1506                 WRITE32(2);
1507                 WRITE32(word0);
1508                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1509         }
1510         if (bmval0 & FATTR4_WORD0_TYPE) {
1511                 if ((buflen -= 4) < 0)
1512                         goto out_resource;
1513                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1514                 if (dummy == NF4BAD)
1515                         goto out_serverfault;
1516                 WRITE32(dummy);
1517         }
1518         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1519                 if ((buflen -= 4) < 0)
1520                         goto out_resource;
1521                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1522                         WRITE32(NFS4_FH_PERSISTENT);
1523                 else
1524                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1525         }
1526         if (bmval0 & FATTR4_WORD0_CHANGE) {
1527                 /*
1528                  * Note: This _must_ be consistent with the scheme for writing
1529                  * change_info, so any changes made here must be reflected there
1530                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1531                  * macro above.)
1532                  */
1533                 if ((buflen -= 8) < 0)
1534                         goto out_resource;
1535                 WRITE32(stat.ctime.tv_sec);
1536                 WRITE32(stat.ctime.tv_nsec);
1537         }
1538         if (bmval0 & FATTR4_WORD0_SIZE) {
1539                 if ((buflen -= 8) < 0)
1540                         goto out_resource;
1541                 WRITE64(stat.size);
1542         }
1543         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1544                 if ((buflen -= 4) < 0)
1545                         goto out_resource;
1546                 WRITE32(1);
1547         }
1548         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1549                 if ((buflen -= 4) < 0)
1550                         goto out_resource;
1551                 WRITE32(1);
1552         }
1553         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1554                 if ((buflen -= 4) < 0)
1555                         goto out_resource;
1556                 WRITE32(0);
1557         }
1558         if (bmval0 & FATTR4_WORD0_FSID) {
1559                 if ((buflen -= 16) < 0)
1560                         goto out_resource;
1561                 if (exp->ex_fslocs.migrated) {
1562                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1563                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1564                 } else switch(fsid_source(fhp)) {
1565                 case FSIDSOURCE_FSID:
1566                         WRITE64((u64)exp->ex_fsid);
1567                         WRITE64((u64)0);
1568                         break;
1569                 case FSIDSOURCE_DEV:
1570                         WRITE32(0);
1571                         WRITE32(MAJOR(stat.dev));
1572                         WRITE32(0);
1573                         WRITE32(MINOR(stat.dev));
1574                         break;
1575                 case FSIDSOURCE_UUID:
1576                         WRITEMEM(exp->ex_uuid, 16);
1577                         break;
1578                 }
1579         }
1580         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1581                 if ((buflen -= 4) < 0)
1582                         goto out_resource;
1583                 WRITE32(0);
1584         }
1585         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1586                 if ((buflen -= 4) < 0)
1587                         goto out_resource;
1588                 WRITE32(NFSD_LEASE_TIME);
1589         }
1590         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1591                 if ((buflen -= 4) < 0)
1592                         goto out_resource;
1593                 WRITE32(rdattr_err);
1594         }
1595         if (bmval0 & FATTR4_WORD0_ACL) {
1596                 struct nfs4_ace *ace;
1597
1598                 if (acl == NULL) {
1599                         if ((buflen -= 4) < 0)
1600                                 goto out_resource;
1601
1602                         WRITE32(0);
1603                         goto out_acl;
1604                 }
1605                 if ((buflen -= 4) < 0)
1606                         goto out_resource;
1607                 WRITE32(acl->naces);
1608
1609                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1610                         if ((buflen -= 4*3) < 0)
1611                                 goto out_resource;
1612                         WRITE32(ace->type);
1613                         WRITE32(ace->flag);
1614                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1615                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1616                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1617                                 &p, &buflen);
1618                         if (status == nfserr_resource)
1619                                 goto out_resource;
1620                         if (status)
1621                                 goto out;
1622                 }
1623         }
1624 out_acl:
1625         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1626                 if ((buflen -= 4) < 0)
1627                         goto out_resource;
1628                 WRITE32(aclsupport ?
1629                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1630         }
1631         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1632                 if ((buflen -= 4) < 0)
1633                         goto out_resource;
1634                 WRITE32(1);
1635         }
1636         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1637                 if ((buflen -= 4) < 0)
1638                         goto out_resource;
1639                 WRITE32(1);
1640         }
1641         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1642                 if ((buflen -= 4) < 0)
1643                         goto out_resource;
1644                 WRITE32(1);
1645         }
1646         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1647                 if ((buflen -= 4) < 0)
1648                         goto out_resource;
1649                 WRITE32(1);
1650         }
1651         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1652                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1653                 if (buflen < 0)
1654                         goto out_resource;
1655                 WRITE32(fhp->fh_handle.fh_size);
1656                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1657         }
1658         if (bmval0 & FATTR4_WORD0_FILEID) {
1659                 if ((buflen -= 8) < 0)
1660                         goto out_resource;
1661                 WRITE64((u64) stat.ino);
1662         }
1663         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1664                 if ((buflen -= 8) < 0)
1665                         goto out_resource;
1666                 WRITE64((u64) statfs.f_ffree);
1667         }
1668         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1669                 if ((buflen -= 8) < 0)
1670                         goto out_resource;
1671                 WRITE64((u64) statfs.f_ffree);
1672         }
1673         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1674                 if ((buflen -= 8) < 0)
1675                         goto out_resource;
1676                 WRITE64((u64) statfs.f_files);
1677         }
1678         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1679                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1680                 if (status == nfserr_resource)
1681                         goto out_resource;
1682                 if (status)
1683                         goto out;
1684         }
1685         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1686                 if ((buflen -= 4) < 0)
1687                         goto out_resource;
1688                 WRITE32(1);
1689         }
1690         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1691                 if ((buflen -= 8) < 0)
1692                         goto out_resource;
1693                 WRITE64(~(u64)0);
1694         }
1695         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1696                 if ((buflen -= 4) < 0)
1697                         goto out_resource;
1698                 WRITE32(255);
1699         }
1700         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1701                 if ((buflen -= 4) < 0)
1702                         goto out_resource;
1703                 WRITE32(~(u32) 0);
1704         }
1705         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1706                 if ((buflen -= 8) < 0)
1707                         goto out_resource;
1708                 WRITE64((u64) svc_max_payload(rqstp));
1709         }
1710         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1711                 if ((buflen -= 8) < 0)
1712                         goto out_resource;
1713                 WRITE64((u64) svc_max_payload(rqstp));
1714         }
1715         if (bmval1 & FATTR4_WORD1_MODE) {
1716                 if ((buflen -= 4) < 0)
1717                         goto out_resource;
1718                 WRITE32(stat.mode & S_IALLUGO);
1719         }
1720         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1721                 if ((buflen -= 4) < 0)
1722                         goto out_resource;
1723                 WRITE32(1);
1724         }
1725         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1726                 if ((buflen -= 4) < 0)
1727                         goto out_resource;
1728                 WRITE32(stat.nlink);
1729         }
1730         if (bmval1 & FATTR4_WORD1_OWNER) {
1731                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1732                 if (status == nfserr_resource)
1733                         goto out_resource;
1734                 if (status)
1735                         goto out;
1736         }
1737         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1738                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1739                 if (status == nfserr_resource)
1740                         goto out_resource;
1741                 if (status)
1742                         goto out;
1743         }
1744         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1745                 if ((buflen -= 8) < 0)
1746                         goto out_resource;
1747                 WRITE32((u32) MAJOR(stat.rdev));
1748                 WRITE32((u32) MINOR(stat.rdev));
1749         }
1750         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1751                 if ((buflen -= 8) < 0)
1752                         goto out_resource;
1753                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1754                 WRITE64(dummy64);
1755         }
1756         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1757                 if ((buflen -= 8) < 0)
1758                         goto out_resource;
1759                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1760                 WRITE64(dummy64);
1761         }
1762         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1763                 if ((buflen -= 8) < 0)
1764                         goto out_resource;
1765                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1766                 WRITE64(dummy64);
1767         }
1768         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1769                 if ((buflen -= 8) < 0)
1770                         goto out_resource;
1771                 dummy64 = (u64)stat.blocks << 9;
1772                 WRITE64(dummy64);
1773         }
1774         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1775                 if ((buflen -= 12) < 0)
1776                         goto out_resource;
1777                 WRITE32(0);
1778                 WRITE32(stat.atime.tv_sec);
1779                 WRITE32(stat.atime.tv_nsec);
1780         }
1781         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1782                 if ((buflen -= 12) < 0)
1783                         goto out_resource;
1784                 WRITE32(0);
1785                 WRITE32(1);
1786                 WRITE32(0);
1787         }
1788         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1789                 if ((buflen -= 12) < 0)
1790                         goto out_resource;
1791                 WRITE32(0);
1792                 WRITE32(stat.ctime.tv_sec);
1793                 WRITE32(stat.ctime.tv_nsec);
1794         }
1795         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1796                 if ((buflen -= 12) < 0)
1797                         goto out_resource;
1798                 WRITE32(0);
1799                 WRITE32(stat.mtime.tv_sec);
1800                 WRITE32(stat.mtime.tv_nsec);
1801         }
1802         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1803                 struct dentry *mnt_pnt, *mnt_root;
1804
1805                 if ((buflen -= 8) < 0)
1806                         goto out_resource;
1807                 mnt_root = exp->ex_mnt->mnt_root;
1808                 if (mnt_root->d_inode == dentry->d_inode) {
1809                         mnt_pnt = exp->ex_mnt->mnt_mountpoint;
1810                         WRITE64((u64) mnt_pnt->d_inode->i_ino);
1811                 } else
1812                         WRITE64((u64) stat.ino);
1813         }
1814         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1815         *countp = p - buffer;
1816         status = nfs_ok;
1817
1818 out:
1819         kfree(acl);
1820         if (fhp == &tempfh)
1821                 fh_put(&tempfh);
1822         return status;
1823 out_nfserr:
1824         status = nfserrno(err);
1825         goto out;
1826 out_resource:
1827         *countp = 0;
1828         status = nfserr_resource;
1829         goto out;
1830 out_serverfault:
1831         status = nfserr_serverfault;
1832         goto out;
1833 }
1834
1835 static __be32
1836 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1837                 const char *name, int namlen, __be32 *p, int *buflen)
1838 {
1839         struct svc_export *exp = cd->rd_fhp->fh_export;
1840         struct dentry *dentry;
1841         __be32 nfserr;
1842
1843         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1844         if (IS_ERR(dentry))
1845                 return nfserrno(PTR_ERR(dentry));
1846
1847         exp_get(exp);
1848         if (d_mountpoint(dentry)) {
1849                 int err;
1850
1851                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1852                 if (err) {
1853                         nfserr = nfserrno(err);
1854                         goto out_put;
1855                 }
1856
1857         }
1858         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1859                                         cd->rd_rqstp);
1860 out_put:
1861         dput(dentry);
1862         exp_put(exp);
1863         return nfserr;
1864 }
1865
1866 static __be32 *
1867 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1868 {
1869         __be32 *attrlenp;
1870
1871         if (buflen < 6)
1872                 return NULL;
1873         *p++ = htonl(2);
1874         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1875         *p++ = htonl(0);                         /* bmval1 */
1876
1877         attrlenp = p++;
1878         *p++ = nfserr;       /* no htonl */
1879         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1880         return p;
1881 }
1882
1883 static int
1884 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1885                     loff_t offset, u64 ino, unsigned int d_type)
1886 {
1887         struct readdir_cd *ccd = ccdv;
1888         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1889         int buflen;
1890         __be32 *p = cd->buffer;
1891         __be32 nfserr = nfserr_toosmall;
1892
1893         /* In nfsv4, "." and ".." never make it onto the wire.. */
1894         if (name && isdotent(name, namlen)) {
1895                 cd->common.err = nfs_ok;
1896                 return 0;
1897         }
1898
1899         if (cd->offset)
1900                 xdr_encode_hyper(cd->offset, (u64) offset);
1901
1902         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1903         if (buflen < 0)
1904                 goto fail;
1905
1906         *p++ = xdr_one;                             /* mark entry present */
1907         cd->offset = p;                             /* remember pointer */
1908         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1909         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1910
1911         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1912         switch (nfserr) {
1913         case nfs_ok:
1914                 p += buflen;
1915                 break;
1916         case nfserr_resource:
1917                 nfserr = nfserr_toosmall;
1918                 goto fail;
1919         case nfserr_dropit:
1920                 goto fail;
1921         default:
1922                 /*
1923                  * If the client requested the RDATTR_ERROR attribute,
1924                  * we stuff the error code into this attribute
1925                  * and continue.  If this attribute was not requested,
1926                  * then in accordance with the spec, we fail the
1927                  * entire READDIR operation(!)
1928                  */
1929                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1930                         goto fail;
1931                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1932                 if (p == NULL) {
1933                         nfserr = nfserr_toosmall;
1934                         goto fail;
1935                 }
1936         }
1937         cd->buflen -= (p - cd->buffer);
1938         cd->buffer = p;
1939         cd->common.err = nfs_ok;
1940         return 0;
1941 fail:
1942         cd->common.err = nfserr;
1943         return -EINVAL;
1944 }
1945
1946 static void
1947 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1948 {
1949         ENCODE_HEAD;
1950
1951         if (!nfserr) {
1952                 RESERVE_SPACE(8);
1953                 WRITE32(access->ac_supported);
1954                 WRITE32(access->ac_resp_access);
1955                 ADJUST_ARGS();
1956         }
1957 }
1958
1959 static void
1960 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1961 {
1962         ENCODE_SEQID_OP_HEAD;
1963
1964         if (!nfserr) {
1965                 RESERVE_SPACE(sizeof(stateid_t));
1966                 WRITE32(close->cl_stateid.si_generation);
1967                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1968                 ADJUST_ARGS();
1969         }
1970         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1971 }
1972
1973
1974 static void
1975 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
1976 {
1977         ENCODE_HEAD;
1978
1979         if (!nfserr) {
1980                 RESERVE_SPACE(8);
1981                 WRITEMEM(commit->co_verf.data, 8);
1982                 ADJUST_ARGS();
1983         }
1984 }
1985
1986 static void
1987 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
1988 {
1989         ENCODE_HEAD;
1990
1991         if (!nfserr) {
1992                 RESERVE_SPACE(32);
1993                 WRITECINFO(create->cr_cinfo);
1994                 WRITE32(2);
1995                 WRITE32(create->cr_bmval[0]);
1996                 WRITE32(create->cr_bmval[1]);
1997                 ADJUST_ARGS();
1998         }
1999 }
2000
2001 static __be32
2002 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2003 {
2004         struct svc_fh *fhp = getattr->ga_fhp;
2005         int buflen;
2006
2007         if (nfserr)
2008                 return nfserr;
2009
2010         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2011         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2012                                     resp->p, &buflen, getattr->ga_bmval,
2013                                     resp->rqstp);
2014         if (!nfserr)
2015                 resp->p += buflen;
2016         return nfserr;
2017 }
2018
2019 static void
2020 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh *fhp)
2021 {
2022         unsigned int len;
2023         ENCODE_HEAD;
2024
2025         if (!nfserr) {
2026                 len = fhp->fh_handle.fh_size;
2027                 RESERVE_SPACE(len + 4);
2028                 WRITE32(len);
2029                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2030                 ADJUST_ARGS();
2031         }
2032 }
2033
2034 /*
2035 * Including all fields other than the name, a LOCK4denied structure requires
2036 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2037 */
2038 static void
2039 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2040 {
2041         ENCODE_HEAD;
2042
2043         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2044         WRITE64(ld->ld_start);
2045         WRITE64(ld->ld_length);
2046         WRITE32(ld->ld_type);
2047         if (ld->ld_sop) {
2048                 WRITEMEM(&ld->ld_clientid, 8);
2049                 WRITE32(ld->ld_sop->so_owner.len);
2050                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2051                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2052         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2053                 WRITE64((u64)0); /* clientid */
2054                 WRITE32(0); /* length of owner name */
2055         }
2056         ADJUST_ARGS();
2057 }
2058
2059 static void
2060 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2061 {
2062         ENCODE_SEQID_OP_HEAD;
2063
2064         if (!nfserr) {
2065                 RESERVE_SPACE(4 + sizeof(stateid_t));
2066                 WRITE32(lock->lk_resp_stateid.si_generation);
2067                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2068                 ADJUST_ARGS();
2069         } else if (nfserr == nfserr_denied)
2070                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2071
2072         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2073 }
2074
2075 static void
2076 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2077 {
2078         if (nfserr == nfserr_denied)
2079                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2080 }
2081
2082 static void
2083 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2084 {
2085         ENCODE_SEQID_OP_HEAD;
2086
2087         if (!nfserr) {
2088                 RESERVE_SPACE(sizeof(stateid_t));
2089                 WRITE32(locku->lu_stateid.si_generation);
2090                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2091                 ADJUST_ARGS();
2092         }
2093
2094         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2095 }
2096
2097
2098 static void
2099 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2100 {
2101         ENCODE_HEAD;
2102
2103         if (!nfserr) {
2104                 RESERVE_SPACE(20);
2105                 WRITECINFO(link->li_cinfo);
2106                 ADJUST_ARGS();
2107         }
2108 }
2109
2110
2111 static void
2112 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2113 {
2114         ENCODE_SEQID_OP_HEAD;
2115
2116         if (nfserr)
2117                 goto out;
2118
2119         RESERVE_SPACE(36 + sizeof(stateid_t));
2120         WRITE32(open->op_stateid.si_generation);
2121         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2122         WRITECINFO(open->op_cinfo);
2123         WRITE32(open->op_rflags);
2124         WRITE32(2);
2125         WRITE32(open->op_bmval[0]);
2126         WRITE32(open->op_bmval[1]);
2127         WRITE32(open->op_delegate_type);
2128         ADJUST_ARGS();
2129
2130         switch (open->op_delegate_type) {
2131         case NFS4_OPEN_DELEGATE_NONE:
2132                 break;
2133         case NFS4_OPEN_DELEGATE_READ:
2134                 RESERVE_SPACE(20 + sizeof(stateid_t));
2135                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2136                 WRITE32(open->op_recall);
2137
2138                 /*
2139                  * TODO: ACE's in delegations
2140                  */
2141                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2142                 WRITE32(0);
2143                 WRITE32(0);
2144                 WRITE32(0);   /* XXX: is NULL principal ok? */
2145                 ADJUST_ARGS();
2146                 break;
2147         case NFS4_OPEN_DELEGATE_WRITE:
2148                 RESERVE_SPACE(32 + sizeof(stateid_t));
2149                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2150                 WRITE32(0);
2151
2152                 /*
2153                  * TODO: space_limit's in delegations
2154                  */
2155                 WRITE32(NFS4_LIMIT_SIZE);
2156                 WRITE32(~(u32)0);
2157                 WRITE32(~(u32)0);
2158
2159                 /*
2160                  * TODO: ACE's in delegations
2161                  */
2162                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2163                 WRITE32(0);
2164                 WRITE32(0);
2165                 WRITE32(0);   /* XXX: is NULL principal ok? */
2166                 ADJUST_ARGS();
2167                 break;
2168         default:
2169                 BUG();
2170         }
2171         /* XXX save filehandle here */
2172 out:
2173         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2174 }
2175
2176 static void
2177 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2178 {
2179         ENCODE_SEQID_OP_HEAD;
2180
2181         if (!nfserr) {
2182                 RESERVE_SPACE(sizeof(stateid_t));
2183                 WRITE32(oc->oc_resp_stateid.si_generation);
2184                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2185                 ADJUST_ARGS();
2186         }
2187
2188         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2189 }
2190
2191 static void
2192 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2193 {
2194         ENCODE_SEQID_OP_HEAD;
2195
2196         if (!nfserr) {
2197                 RESERVE_SPACE(sizeof(stateid_t));
2198                 WRITE32(od->od_stateid.si_generation);
2199                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2200                 ADJUST_ARGS();
2201         }
2202
2203         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2204 }
2205
2206 static __be32
2207 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2208                   struct nfsd4_read *read)
2209 {
2210         u32 eof;
2211         int v, pn;
2212         unsigned long maxcount;
2213         long len;
2214         ENCODE_HEAD;
2215
2216         if (nfserr)
2217                 return nfserr;
2218         if (resp->xbuf->page_len)
2219                 return nfserr_resource;
2220
2221         RESERVE_SPACE(8); /* eof flag and byte count */
2222
2223         maxcount = svc_max_payload(resp->rqstp);
2224         if (maxcount > read->rd_length)
2225                 maxcount = read->rd_length;
2226
2227         len = maxcount;
2228         v = 0;
2229         while (len > 0) {
2230                 pn = resp->rqstp->rq_resused++;
2231                 resp->rqstp->rq_vec[v].iov_base =
2232                         page_address(resp->rqstp->rq_respages[pn]);
2233                 resp->rqstp->rq_vec[v].iov_len =
2234                         len < PAGE_SIZE ? len : PAGE_SIZE;
2235                 v++;
2236                 len -= PAGE_SIZE;
2237         }
2238         read->rd_vlen = v;
2239
2240         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2241                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2242                         &maxcount);
2243
2244         if (nfserr == nfserr_symlink)
2245                 nfserr = nfserr_inval;
2246         if (nfserr)
2247                 return nfserr;
2248         eof = (read->rd_offset + maxcount >=
2249                read->rd_fhp->fh_dentry->d_inode->i_size);
2250
2251         WRITE32(eof);
2252         WRITE32(maxcount);
2253         ADJUST_ARGS();
2254         resp->xbuf->head[0].iov_len = (char*)p
2255                                         - (char*)resp->xbuf->head[0].iov_base;
2256         resp->xbuf->page_len = maxcount;
2257
2258         /* Use rest of head for padding and remaining ops: */
2259         resp->xbuf->tail[0].iov_base = p;
2260         resp->xbuf->tail[0].iov_len = 0;
2261         if (maxcount&3) {
2262                 RESERVE_SPACE(4);
2263                 WRITE32(0);
2264                 resp->xbuf->tail[0].iov_base += maxcount&3;
2265                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2266                 ADJUST_ARGS();
2267         }
2268         return 0;
2269 }
2270
2271 static __be32
2272 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2273 {
2274         int maxcount;
2275         char *page;
2276         ENCODE_HEAD;
2277
2278         if (nfserr)
2279                 return nfserr;
2280         if (resp->xbuf->page_len)
2281                 return nfserr_resource;
2282
2283         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2284
2285         maxcount = PAGE_SIZE;
2286         RESERVE_SPACE(4);
2287
2288         /*
2289          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2290          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2291          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2292          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2293          */
2294         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2295         if (nfserr == nfserr_isdir)
2296                 return nfserr_inval;
2297         if (nfserr)
2298                 return nfserr;
2299
2300         WRITE32(maxcount);
2301         ADJUST_ARGS();
2302         resp->xbuf->head[0].iov_len = (char*)p
2303                                 - (char*)resp->xbuf->head[0].iov_base;
2304         resp->xbuf->page_len = maxcount;
2305
2306         /* Use rest of head for padding and remaining ops: */
2307         resp->xbuf->tail[0].iov_base = p;
2308         resp->xbuf->tail[0].iov_len = 0;
2309         if (maxcount&3) {
2310                 RESERVE_SPACE(4);
2311                 WRITE32(0);
2312                 resp->xbuf->tail[0].iov_base += maxcount&3;
2313                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2314                 ADJUST_ARGS();
2315         }
2316         return 0;
2317 }
2318
2319 static __be32
2320 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2321 {
2322         int maxcount;
2323         loff_t offset;
2324         __be32 *page, *savep, *tailbase;
2325         ENCODE_HEAD;
2326
2327         if (nfserr)
2328                 return nfserr;
2329         if (resp->xbuf->page_len)
2330                 return nfserr_resource;
2331
2332         RESERVE_SPACE(8);  /* verifier */
2333         savep = p;
2334
2335         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2336         WRITE32(0);
2337         WRITE32(0);
2338         ADJUST_ARGS();
2339         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2340         tailbase = p;
2341
2342         maxcount = PAGE_SIZE;
2343         if (maxcount > readdir->rd_maxcount)
2344                 maxcount = readdir->rd_maxcount;
2345
2346         /*
2347          * Convert from bytes to words, account for the two words already
2348          * written, make sure to leave two words at the end for the next
2349          * pointer and eof field.
2350          */
2351         maxcount = (maxcount >> 2) - 4;
2352         if (maxcount < 0) {
2353                 nfserr =  nfserr_toosmall;
2354                 goto err_no_verf;
2355         }
2356
2357         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2358         readdir->common.err = 0;
2359         readdir->buflen = maxcount;
2360         readdir->buffer = page;
2361         readdir->offset = NULL;
2362
2363         offset = readdir->rd_cookie;
2364         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2365                               &offset,
2366                               &readdir->common, nfsd4_encode_dirent);
2367         if (nfserr == nfs_ok &&
2368             readdir->common.err == nfserr_toosmall &&
2369             readdir->buffer == page)
2370                 nfserr = nfserr_toosmall;
2371         if (nfserr == nfserr_symlink)
2372                 nfserr = nfserr_notdir;
2373         if (nfserr)
2374                 goto err_no_verf;
2375
2376         if (readdir->offset)
2377                 xdr_encode_hyper(readdir->offset, offset);
2378
2379         p = readdir->buffer;
2380         *p++ = 0;       /* no more entries */
2381         *p++ = htonl(readdir->common.err == nfserr_eof);
2382         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2383                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2384
2385         /* Use rest of head for padding and remaining ops: */
2386         resp->xbuf->tail[0].iov_base = tailbase;
2387         resp->xbuf->tail[0].iov_len = 0;
2388         resp->p = resp->xbuf->tail[0].iov_base;
2389         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2390
2391         return 0;
2392 err_no_verf:
2393         p = savep;
2394         ADJUST_ARGS();
2395         return nfserr;
2396 }
2397
2398 static void
2399 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2400 {
2401         ENCODE_HEAD;
2402
2403         if (!nfserr) {
2404                 RESERVE_SPACE(20);
2405                 WRITECINFO(remove->rm_cinfo);
2406                 ADJUST_ARGS();
2407         }
2408 }
2409
2410 static void
2411 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2412 {
2413         ENCODE_HEAD;
2414
2415         if (!nfserr) {
2416                 RESERVE_SPACE(40);
2417                 WRITECINFO(rename->rn_sinfo);
2418                 WRITECINFO(rename->rn_tinfo);
2419                 ADJUST_ARGS();
2420         }
2421 }
2422
2423 /*
2424  * The SETATTR encode routine is special -- it always encodes a bitmap,
2425  * regardless of the error status.
2426  */
2427 static void
2428 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2429 {
2430         ENCODE_HEAD;
2431
2432         RESERVE_SPACE(12);
2433         if (nfserr) {
2434                 WRITE32(2);
2435                 WRITE32(0);
2436                 WRITE32(0);
2437         }
2438         else {
2439                 WRITE32(2);
2440                 WRITE32(setattr->sa_bmval[0]);
2441                 WRITE32(setattr->sa_bmval[1]);
2442         }
2443         ADJUST_ARGS();
2444 }
2445
2446 static void
2447 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2448 {
2449         ENCODE_HEAD;
2450
2451         if (!nfserr) {
2452                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2453                 WRITEMEM(&scd->se_clientid, 8);
2454                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2455                 ADJUST_ARGS();
2456         }
2457         else if (nfserr == nfserr_clid_inuse) {
2458                 RESERVE_SPACE(8);
2459                 WRITE32(0);
2460                 WRITE32(0);
2461                 ADJUST_ARGS();
2462         }
2463 }
2464
2465 static void
2466 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2467 {
2468         ENCODE_HEAD;
2469
2470         if (!nfserr) {
2471                 RESERVE_SPACE(16);
2472                 WRITE32(write->wr_bytes_written);
2473                 WRITE32(write->wr_how_written);
2474                 WRITEMEM(write->wr_verifier.data, 8);
2475                 ADJUST_ARGS();
2476         }
2477 }
2478
2479 void
2480 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2481 {
2482         __be32 *statp;
2483         ENCODE_HEAD;
2484
2485         RESERVE_SPACE(8);
2486         WRITE32(op->opnum);
2487         statp = p++;    /* to be backfilled at the end */
2488         ADJUST_ARGS();
2489
2490         switch (op->opnum) {
2491         case OP_ACCESS:
2492                 nfsd4_encode_access(resp, op->status, &op->u.access);
2493                 break;
2494         case OP_CLOSE:
2495                 nfsd4_encode_close(resp, op->status, &op->u.close);
2496                 break;
2497         case OP_COMMIT:
2498                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2499                 break;
2500         case OP_CREATE:
2501                 nfsd4_encode_create(resp, op->status, &op->u.create);
2502                 break;
2503         case OP_DELEGRETURN:
2504                 break;
2505         case OP_GETATTR:
2506                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2507                 break;
2508         case OP_GETFH:
2509                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2510                 break;
2511         case OP_LINK:
2512                 nfsd4_encode_link(resp, op->status, &op->u.link);
2513                 break;
2514         case OP_LOCK:
2515                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2516                 break;
2517         case OP_LOCKT:
2518                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2519                 break;
2520         case OP_LOCKU:
2521                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2522                 break;
2523         case OP_LOOKUP:
2524                 break;
2525         case OP_LOOKUPP:
2526                 break;
2527         case OP_NVERIFY:
2528                 break;
2529         case OP_OPEN:
2530                 nfsd4_encode_open(resp, op->status, &op->u.open);
2531                 break;
2532         case OP_OPEN_CONFIRM:
2533                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2534                 break;
2535         case OP_OPEN_DOWNGRADE:
2536                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2537                 break;
2538         case OP_PUTFH:
2539                 break;
2540         case OP_PUTROOTFH:
2541                 break;
2542         case OP_READ:
2543                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2544                 break;
2545         case OP_READDIR:
2546                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2547                 break;
2548         case OP_READLINK:
2549                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2550                 break;
2551         case OP_REMOVE:
2552                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2553                 break;
2554         case OP_RENAME:
2555                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2556                 break;
2557         case OP_RENEW:
2558                 break;
2559         case OP_RESTOREFH:
2560                 break;
2561         case OP_SAVEFH:
2562                 break;
2563         case OP_SETATTR:
2564                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2565                 break;
2566         case OP_SETCLIENTID:
2567                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2568                 break;
2569         case OP_SETCLIENTID_CONFIRM:
2570                 break;
2571         case OP_VERIFY:
2572                 break;
2573         case OP_WRITE:
2574                 nfsd4_encode_write(resp, op->status, &op->u.write);
2575                 break;
2576         case OP_RELEASE_LOCKOWNER:
2577                 break;
2578         default:
2579                 break;
2580         }
2581
2582         /*
2583          * Note: We write the status directly, instead of using WRITE32(),
2584          * since it is already in network byte order.
2585          */
2586         *statp = op->status;
2587 }
2588
2589 /*
2590  * Encode the reply stored in the stateowner reply cache
2591  *
2592  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2593  * previously sent already encoded operation.
2594  *
2595  * called with nfs4_lock_state() held
2596  */
2597 void
2598 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2599 {
2600         ENCODE_HEAD;
2601         struct nfs4_replay *rp = op->replay;
2602
2603         BUG_ON(!rp);
2604
2605         RESERVE_SPACE(8);
2606         WRITE32(op->opnum);
2607         *p++ = rp->rp_status;  /* already xdr'ed */
2608         ADJUST_ARGS();
2609
2610         RESERVE_SPACE(rp->rp_buflen);
2611         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2612         ADJUST_ARGS();
2613 }
2614
2615 /*
2616  * END OF "GENERIC" ENCODE ROUTINES.
2617  */
2618
2619 int
2620 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2621 {
2622         return xdr_ressize_check(rqstp, p);
2623 }
2624
2625 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2626 {
2627         if (args->ops != args->iops) {
2628                 kfree(args->ops);
2629                 args->ops = args->iops;
2630         }
2631         kfree(args->tmpp);
2632         args->tmpp = NULL;
2633         while (args->to_free) {
2634                 struct tmpbuf *tb = args->to_free;
2635                 args->to_free = tb->next;
2636                 tb->release(tb->buf);
2637                 kfree(tb);
2638         }
2639 }
2640
2641 int
2642 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2643 {
2644         __be32 status;
2645
2646         args->p = p;
2647         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2648         args->pagelist = rqstp->rq_arg.pages;
2649         args->pagelen = rqstp->rq_arg.page_len;
2650         args->tmpp = NULL;
2651         args->to_free = NULL;
2652         args->ops = args->iops;
2653         args->rqstp = rqstp;
2654
2655         status = nfsd4_decode_compound(args);
2656         if (status) {
2657                 nfsd4_release_compoundargs(args);
2658         }
2659         return !status;
2660 }
2661
2662 int
2663 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2664 {
2665         /*
2666          * All that remains is to write the tag and operation count...
2667          */
2668         struct kvec *iov;
2669         p = resp->tagp;
2670         *p++ = htonl(resp->taglen);
2671         memcpy(p, resp->tag, resp->taglen);
2672         p += XDR_QUADLEN(resp->taglen);
2673         *p++ = htonl(resp->opcnt);
2674
2675         if (rqstp->rq_res.page_len)
2676                 iov = &rqstp->rq_res.tail[0];
2677         else
2678                 iov = &rqstp->rq_res.head[0];
2679         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2680         BUG_ON(iov->iov_len > PAGE_SIZE);
2681         return 1;
2682 }
2683
2684 /*
2685  * Local variables:
2686  *  c-basic-offset: 8
2687  * End:
2688  */