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   1 /*
   2  *  fs/nfs/nfs4xdr.c
   3  *
   4  *  Server-side XDR for NFSv4
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * TODO: Neil Brown made the following observation:  We currently
  38  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  39  * never release any of that until the request is complete.
  40  * It would be good to calculate a new maximum response size while
  41  * decoding the COMPOUND, and call svc_reserve with this number
  42  * at the end of nfs4svc_decode_compoundargs.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/smp.h>
  47 #include <linux/fs.h>
  48 #include <linux/namei.h>
  49 #include <linux/vfs.h>
  50 #include <linux/sunrpc/xdr.h>
  51 #include <linux/sunrpc/svc.h>
  52 #include <linux/sunrpc/clnt.h>
  53 #include <linux/nfsd/nfsd.h>
  54 #include <linux/nfsd/state.h>
  55 #include <linux/nfsd/xdr4.h>
  56 #include <linux/nfsd_idmap.h>
  57 #include <linux/nfs4.h>
  58 #include <linux/nfs4_acl.h>
  59 #include <linux/sunrpc/gss_api.h>
  60 #include <linux/sunrpc/svcauth_gss.h>
  61
  62 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  63
  64 /*
  65  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  66  * directory in order to indicate to the client that a filesystem boundary is present
  67  * We use a fixed fsid for a referral
  68  */
  69 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  70 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  71
  72 static __be32
  73 check_filename(char *str, int len, __be32 err)
  74 {
  75         int i;
  76
  77         if (len == 0)
  78                 return nfserr_inval;
  79         if (isdotent(str, len))
  80                 return err;
  81         for (i = 0; i < len; i++)
  82                 if (str[i] == '/')
  83                         return err;
  84         return 0;
  85 }
  86
  87 /*
  88  * START OF "GENERIC" DECODE ROUTINES.
  89  *   These may look a little ugly since they are imported from a "generic"
  90  * set of XDR encode/decode routines which are intended to be shared by
  91  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  92  *
  93  * If the pain of reading these is too great, it should be a straightforward
  94  * task to translate them into Linux-specific versions which are more
  95  * consistent with the style used in NFSv2/v3...
  96  */
  97 #define DECODE_HEAD                             \
  98         __be32 *p;                              \
  99         __be32 status
 100 #define DECODE_TAIL                             \
 101         status = 0;                             \
 102 out:                                            \
 103         return status;                          \
 104 xdr_error:                                      \
 105         printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 106         status = nfserr_bad_xdr;                \
 107         goto out
 108
 109 #define READ32(x)         (x) = ntohl(*p++)
 110 #define READ64(x)         do {                  \
 111         (x) = (u64)ntohl(*p++) << 32;           \
 112         (x) |= ntohl(*p++);                     \
 113 } while (0)
 114 #define READTIME(x)       do {                  \
 115         p++;                                    \
 116         (x) = ntohl(*p++);                      \
 117         p++;                                    \
 118 } while (0)
 119 #define READMEM(x,nbytes) do {                  \
 120         x = (char *)p;                          \
 121         p += XDR_QUADLEN(nbytes);               \
 122 } while (0)
 123 #define SAVEMEM(x,nbytes) do {                  \
 124         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 125                 savemem(argp, p, nbytes) :      \
 126                 (char *)p)) {                   \
 127                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 128                 goto xdr_error;                 \
 129                 }                               \
 130         p += XDR_QUADLEN(nbytes);               \
 131 } while (0)
 132 #define COPYMEM(x,nbytes) do {                  \
 133         memcpy((x), p, nbytes);                 \
 134         p += XDR_QUADLEN(nbytes);               \
 135 } while (0)
 136
 137 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 138 #define READ_BUF(nbytes)  do {                  \
 139         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 140                 p = argp->p;                    \
 141                 argp->p += XDR_QUADLEN(nbytes); \
 142         } else if (!(p = read_buf(argp, nbytes))) { \
 143                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 144                 goto xdr_error;                 \
 145         }                                       \
 146 } while (0)
 147
 148 static __be32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
 149 {
 150         /* We want more bytes than seem to be available.
 151          * Maybe we need a new page, maybe we have just run out
 152          */
 153         int avail = (char*)argp->end - (char*)argp->p;
 154         __be32 *p;
 155         if (avail + argp->pagelen < nbytes)
 156                 return NULL;
 157         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 158                 return NULL;
 159         /* ok, we can do it with the current plus the next page */
 160         if (nbytes <= sizeof(argp->tmp))
 161                 p = argp->tmp;
 162         else {
 163                 kfree(argp->tmpp);
 164                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 165                 if (!p)
 166                         return NULL;
 167
 168         }
 169         memcpy(p, argp->p, avail);
 170         /* step to next page */
 171         argp->p = page_address(argp->pagelist[0]);
 172         argp->pagelist++;
 173         if (argp->pagelen < PAGE_SIZE) {
 174                 argp->end = p + (argp->pagelen>>2);
 175                 argp->pagelen = 0;
 176         } else {
 177                 argp->end = p + (PAGE_SIZE>>2);
 178                 argp->pagelen -= PAGE_SIZE;
 179         }
 180         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 181         argp->p += XDR_QUADLEN(nbytes - avail);
 182         return p;
 183 }
 184
 185 static int
 186 defer_free(struct nfsd4_compoundargs *argp,
 187                 void (*release)(const void *), void *p)
 188 {
 189         struct tmpbuf *tb;
 190
 191         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 192         if (!tb)
 193                 return -ENOMEM;
 194         tb->buf = p;
 195         tb->release = release;
 196         tb->next = argp->to_free;
 197         argp->to_free = tb;
 198         return 0;
 199 }
 200
 201 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 202 {
 203         if (p == argp->tmp) {
 204                 p = kmalloc(nbytes, GFP_KERNEL);
 205                 if (!p)
 206                         return NULL;
 207                 memcpy(p, argp->tmp, nbytes);
 208         } else {
 209                 BUG_ON(p != argp->tmpp);
 210                 argp->tmpp = NULL;
 211         }
 212         if (defer_free(argp, kfree, p)) {
 213                 kfree(p);
 214                 return NULL;
 215         } else
 216                 return (char *)p;
 217 }
 218
 219 static __be32
 220 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 221 {
 222         u32 bmlen;
 223         DECODE_HEAD;
 224
 225         bmval[0] = 0;
 226         bmval[1] = 0;
 227
 228         READ_BUF(4);
 229         READ32(bmlen);
 230         if (bmlen > 1000)
 231                 goto xdr_error;
 232
 233         READ_BUF(bmlen << 2);
 234         if (bmlen > 0)
 235                 READ32(bmval[0]);
 236         if (bmlen > 1)
 237                 READ32(bmval[1]);
 238
 239         DECODE_TAIL;
 240 }
 241
 242 static __be32
 243 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 244     struct nfs4_acl **acl)
 245 {
 246         int expected_len, len = 0;
 247         u32 dummy32;
 248         char *buf;
 249         int host_err;
 250
 251         DECODE_HEAD;
 252         iattr->ia_valid = 0;
 253         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 254                 return status;
 255
 256         /*
 257          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
 258          * read-only attributes return ERR_INVAL.
 259          */
 260         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 261                 return nfserr_attrnotsupp;
 262         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 263                 return nfserr_inval;
 264
 265         READ_BUF(4);
 266         READ32(expected_len);
 267
 268         if (bmval[0] & FATTR4_WORD0_SIZE) {
 269                 READ_BUF(8);
 270                 len += 8;
 271                 READ64(iattr->ia_size);
 272                 iattr->ia_valid |= ATTR_SIZE;
 273         }
 274         if (bmval[0] & FATTR4_WORD0_ACL) {
 275                 int nace;
 276                 struct nfs4_ace *ace;
 277
 278                 READ_BUF(4); len += 4;
 279                 READ32(nace);
 280
 281                 if (nace > NFS4_ACL_MAX)
 282                         return nfserr_resource;
 283
 284                 *acl = nfs4_acl_new(nace);
 285                 if (*acl == NULL) {
 286                         host_err = -ENOMEM;
 287                         goto out_nfserr;
 288                 }
 289                 defer_free(argp, kfree, *acl);
 290
 291                 (*acl)->naces = nace;
 292                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 293                         READ_BUF(16); len += 16;
 294                         READ32(ace->type);
 295                         READ32(ace->flag);
 296                         READ32(ace->access_mask);
 297                         READ32(dummy32);
 298                         READ_BUF(dummy32);
 299                         len += XDR_QUADLEN(dummy32) << 2;
 300                         READMEM(buf, dummy32);
 301                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 302                         host_err = 0;
 303                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 304                                 ace->who = 0;
 305                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 306                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 307                                                 buf, dummy32, &ace->who);
 308                         else
 309                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 310                                                 buf, dummy32, &ace->who);
 311                         if (host_err)
 312                                 goto out_nfserr;
 313                 }
 314         } else
 315                 *acl = NULL;
 316         if (bmval[1] & FATTR4_WORD1_MODE) {
 317                 READ_BUF(4);
 318                 len += 4;
 319                 READ32(iattr->ia_mode);
 320                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 321                 iattr->ia_valid |= ATTR_MODE;
 322         }
 323         if (bmval[1] & FATTR4_WORD1_OWNER) {
 324                 READ_BUF(4);
 325                 len += 4;
 326                 READ32(dummy32);
 327                 READ_BUF(dummy32);
 328                 len += (XDR_QUADLEN(dummy32) << 2);
 329                 READMEM(buf, dummy32);
 330                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 331                         goto out_nfserr;
 332                 iattr->ia_valid |= ATTR_UID;
 333         }
 334         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 335                 READ_BUF(4);
 336                 len += 4;
 337                 READ32(dummy32);
 338                 READ_BUF(dummy32);
 339                 len += (XDR_QUADLEN(dummy32) << 2);
 340                 READMEM(buf, dummy32);
 341                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 342                         goto out_nfserr;
 343                 iattr->ia_valid |= ATTR_GID;
 344         }
 345         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 346                 READ_BUF(4);
 347                 len += 4;
 348                 READ32(dummy32);
 349                 switch (dummy32) {
 350                 case NFS4_SET_TO_CLIENT_TIME:
 351                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 352                            all 32 bits of 'nseconds'. */
 353                         READ_BUF(12);
 354                         len += 12;
 355                         READ32(dummy32);
 356                         if (dummy32)
 357                                 return nfserr_inval;
 358                         READ32(iattr->ia_atime.tv_sec);
 359                         READ32(iattr->ia_atime.tv_nsec);
 360                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 361                                 return nfserr_inval;
 362                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 363                         break;
 364                 case NFS4_SET_TO_SERVER_TIME:
 365                         iattr->ia_valid |= ATTR_ATIME;
 366                         break;
 367                 default:
 368                         goto xdr_error;
 369                 }
 370         }
 371         if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
 372                 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 373                    all 32 bits of 'nseconds'. */
 374                 READ_BUF(12);
 375                 len += 12;
 376                 READ32(dummy32);
 377                 if (dummy32)
 378                         return nfserr_inval;
 379                 READ32(iattr->ia_ctime.tv_sec);
 380                 READ32(iattr->ia_ctime.tv_nsec);
 381                 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
 382                         return nfserr_inval;
 383                 iattr->ia_valid |= ATTR_CTIME;
 384         }
 385         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 386                 READ_BUF(4);
 387                 len += 4;
 388                 READ32(dummy32);
 389                 switch (dummy32) {
 390                 case NFS4_SET_TO_CLIENT_TIME:
 391                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 392                            all 32 bits of 'nseconds'. */
 393                         READ_BUF(12);
 394                         len += 12;
 395                         READ32(dummy32);
 396                         if (dummy32)
 397                                 return nfserr_inval;
 398                         READ32(iattr->ia_mtime.tv_sec);
 399                         READ32(iattr->ia_mtime.tv_nsec);
 400                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 401                                 return nfserr_inval;
 402                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 403                         break;
 404                 case NFS4_SET_TO_SERVER_TIME:
 405                         iattr->ia_valid |= ATTR_MTIME;
 406                         break;
 407                 default:
 408                         goto xdr_error;
 409                 }
 410         }
 411         if (len != expected_len)
 412                 goto xdr_error;
 413
 414         DECODE_TAIL;
 415
 416 out_nfserr:
 417         status = nfserrno(host_err);
 418         goto out;
 419 }
 420
 421 static __be32
 422 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 423 {
 424         DECODE_HEAD;
 425
 426         READ_BUF(4);
 427         READ32(access->ac_req_access);
 428
 429         DECODE_TAIL;
 430 }
 431
 432 static __be32
 433 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 434 {
 435         DECODE_HEAD;
 436
 437         close->cl_stateowner = NULL;
 438         READ_BUF(4 + sizeof(stateid_t));
 439         READ32(close->cl_seqid);
 440         READ32(close->cl_stateid.si_generation);
 441         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
 442
 443         DECODE_TAIL;
 444 }
 445
 446
 447 static __be32
 448 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 449 {
 450         DECODE_HEAD;
 451
 452         READ_BUF(12);
 453         READ64(commit->co_offset);
 454         READ32(commit->co_count);
 455
 456         DECODE_TAIL;
 457 }
 458
 459 static __be32
 460 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 461 {
 462         DECODE_HEAD;
 463
 464         READ_BUF(4);
 465         READ32(create->cr_type);
 466         switch (create->cr_type) {
 467         case NF4LNK:
 468                 READ_BUF(4);
 469                 READ32(create->cr_linklen);
 470                 READ_BUF(create->cr_linklen);
 471                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 472                 break;
 473         case NF4BLK:
 474         case NF4CHR:
 475                 READ_BUF(8);
 476                 READ32(create->cr_specdata1);
 477                 READ32(create->cr_specdata2);
 478                 break;
 479         case NF4SOCK:
 480         case NF4FIFO:
 481         case NF4DIR:
 482         default:
 483                 break;
 484         }
 485
 486         READ_BUF(4);
 487         READ32(create->cr_namelen);
 488         READ_BUF(create->cr_namelen);
 489         SAVEMEM(create->cr_name, create->cr_namelen);
 490         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 491                 return status;
 492
 493         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 494                 goto out;
 495
 496         DECODE_TAIL;
 497 }
 498
 499 static inline __be32
 500 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 501 {
 502         DECODE_HEAD;
 503
 504         READ_BUF(sizeof(stateid_t));
 505         READ32(dr->dr_stateid.si_generation);
 506         COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
 507
 508         DECODE_TAIL;
 509 }
 510
 511 static inline __be32
 512 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 513 {
 514         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 515 }
 516
 517 static __be32
 518 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 519 {
 520         DECODE_HEAD;
 521
 522         READ_BUF(4);
 523         READ32(link->li_namelen);
 524         READ_BUF(link->li_namelen);
 525         SAVEMEM(link->li_name, link->li_namelen);
 526         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 527                 return status;
 528
 529         DECODE_TAIL;
 530 }
 531
 532 static __be32
 533 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 534 {
 535         DECODE_HEAD;
 536
 537         lock->lk_replay_owner = NULL;
 538         /*
 539         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 540         */
 541         READ_BUF(28);
 542         READ32(lock->lk_type);
 543         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 544                 goto xdr_error;
 545         READ32(lock->lk_reclaim);
 546         READ64(lock->lk_offset);
 547         READ64(lock->lk_length);
 548         READ32(lock->lk_is_new);
 549
 550         if (lock->lk_is_new) {
 551                 READ_BUF(36);
 552                 READ32(lock->lk_new_open_seqid);
 553                 READ32(lock->lk_new_open_stateid.si_generation);
 554
 555                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
 556                 READ32(lock->lk_new_lock_seqid);
 557                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 558                 READ32(lock->lk_new_owner.len);
 559                 READ_BUF(lock->lk_new_owner.len);
 560                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 561         } else {
 562                 READ_BUF(20);
 563                 READ32(lock->lk_old_lock_stateid.si_generation);
 564                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
 565                 READ32(lock->lk_old_lock_seqid);
 566         }
 567
 568         DECODE_TAIL;
 569 }
 570
 571 static __be32
 572 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 573 {
 574         DECODE_HEAD;
 575
 576         READ_BUF(32);
 577         READ32(lockt->lt_type);
 578         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 579                 goto xdr_error;
 580         READ64(lockt->lt_offset);
 581         READ64(lockt->lt_length);
 582         COPYMEM(&lockt->lt_clientid, 8);
 583         READ32(lockt->lt_owner.len);
 584         READ_BUF(lockt->lt_owner.len);
 585         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 586
 587         DECODE_TAIL;
 588 }
 589
 590 static __be32
 591 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 592 {
 593         DECODE_HEAD;
 594
 595         locku->lu_stateowner = NULL;
 596         READ_BUF(24 + sizeof(stateid_t));
 597         READ32(locku->lu_type);
 598         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 599                 goto xdr_error;
 600         READ32(locku->lu_seqid);
 601         READ32(locku->lu_stateid.si_generation);
 602         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
 603         READ64(locku->lu_offset);
 604         READ64(locku->lu_length);
 605
 606         DECODE_TAIL;
 607 }
 608
 609 static __be32
 610 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 611 {
 612         DECODE_HEAD;
 613
 614         READ_BUF(4);
 615         READ32(lookup->lo_len);
 616         READ_BUF(lookup->lo_len);
 617         SAVEMEM(lookup->lo_name, lookup->lo_len);
 618         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 619                 return status;
 620
 621         DECODE_TAIL;
 622 }
 623
 624 static __be32
 625 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 626 {
 627         DECODE_HEAD;
 628
 629         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 630         open->op_iattr.ia_valid = 0;
 631         open->op_stateowner = NULL;
 632
 633         /* seqid, share_access, share_deny, clientid, ownerlen */
 634         READ_BUF(16 + sizeof(clientid_t));
 635         READ32(open->op_seqid);
 636         READ32(open->op_share_access);
 637         READ32(open->op_share_deny);
 638         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 639         READ32(open->op_owner.len);
 640
 641         /* owner, open_flag */
 642         READ_BUF(open->op_owner.len + 4);
 643         SAVEMEM(open->op_owner.data, open->op_owner.len);
 644         READ32(open->op_create);
 645         switch (open->op_create) {
 646         case NFS4_OPEN_NOCREATE:
 647                 break;
 648         case NFS4_OPEN_CREATE:
 649                 READ_BUF(4);
 650                 READ32(open->op_createmode);
 651                 switch (open->op_createmode) {
 652                 case NFS4_CREATE_UNCHECKED:
 653                 case NFS4_CREATE_GUARDED:
 654                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 655                                 goto out;
 656                         break;
 657                 case NFS4_CREATE_EXCLUSIVE:
 658                         READ_BUF(8);
 659                         COPYMEM(open->op_verf.data, 8);
 660                         break;
 661                 default:
 662                         goto xdr_error;
 663                 }
 664                 break;
 665         default:
 666                 goto xdr_error;
 667         }
 668
 669         /* open_claim */
 670         READ_BUF(4);
 671         READ32(open->op_claim_type);
 672         switch (open->op_claim_type) {
 673         case NFS4_OPEN_CLAIM_NULL:
 674         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 675                 READ_BUF(4);
 676                 READ32(open->op_fname.len);
 677                 READ_BUF(open->op_fname.len);
 678                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 679                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 680                         return status;
 681                 break;
 682         case NFS4_OPEN_CLAIM_PREVIOUS:
 683                 READ_BUF(4);
 684                 READ32(open->op_delegate_type);
 685                 break;
 686         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 687                 READ_BUF(sizeof(stateid_t) + 4);
 688                 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
 689                 READ32(open->op_fname.len);
 690                 READ_BUF(open->op_fname.len);
 691                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 692                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 693                         return status;
 694                 break;
 695         default:
 696                 goto xdr_error;
 697         }
 698
 699         DECODE_TAIL;
 700 }
 701
 702 static __be32
 703 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 704 {
 705         DECODE_HEAD;
 706
 707         open_conf->oc_stateowner = NULL;
 708         READ_BUF(4 + sizeof(stateid_t));
 709         READ32(open_conf->oc_req_stateid.si_generation);
 710         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
 711         READ32(open_conf->oc_seqid);
 712
 713         DECODE_TAIL;
 714 }
 715
 716 static __be32
 717 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 718 {
 719         DECODE_HEAD;
 720
 721         open_down->od_stateowner = NULL;
 722         READ_BUF(12 + sizeof(stateid_t));
 723         READ32(open_down->od_stateid.si_generation);
 724         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
 725         READ32(open_down->od_seqid);
 726         READ32(open_down->od_share_access);
 727         READ32(open_down->od_share_deny);
 728
 729         DECODE_TAIL;
 730 }
 731
 732 static __be32
 733 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 734 {
 735         DECODE_HEAD;
 736
 737         READ_BUF(4);
 738         READ32(putfh->pf_fhlen);
 739         if (putfh->pf_fhlen > NFS4_FHSIZE)
 740                 goto xdr_error;
 741         READ_BUF(putfh->pf_fhlen);
 742         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 743
 744         DECODE_TAIL;
 745 }
 746
 747 static __be32
 748 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 749 {
 750         DECODE_HEAD;
 751
 752         READ_BUF(sizeof(stateid_t) + 12);
 753         READ32(read->rd_stateid.si_generation);
 754         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
 755         READ64(read->rd_offset);
 756         READ32(read->rd_length);
 757
 758         DECODE_TAIL;
 759 }
 760
 761 static __be32
 762 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 763 {
 764         DECODE_HEAD;
 765
 766         READ_BUF(24);
 767         READ64(readdir->rd_cookie);
 768         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 769         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 770         READ32(readdir->rd_maxcount);
 771         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 772                 goto out;
 773
 774         DECODE_TAIL;
 775 }
 776
 777 static __be32
 778 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 779 {
 780         DECODE_HEAD;
 781
 782         READ_BUF(4);
 783         READ32(remove->rm_namelen);
 784         READ_BUF(remove->rm_namelen);
 785         SAVEMEM(remove->rm_name, remove->rm_namelen);
 786         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 787                 return status;
 788
 789         DECODE_TAIL;
 790 }
 791
 792 static __be32
 793 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 794 {
 795         DECODE_HEAD;
 796
 797         READ_BUF(4);
 798         READ32(rename->rn_snamelen);
 799         READ_BUF(rename->rn_snamelen + 4);
 800         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 801         READ32(rename->rn_tnamelen);
 802         READ_BUF(rename->rn_tnamelen);
 803         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 804         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 805                 return status;
 806         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 807                 return status;
 808
 809         DECODE_TAIL;
 810 }
 811
 812 static __be32
 813 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 814 {
 815         DECODE_HEAD;
 816
 817         READ_BUF(sizeof(clientid_t));
 818         COPYMEM(clientid, sizeof(clientid_t));
 819
 820         DECODE_TAIL;
 821 }
 822
 823 static __be32
 824 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 825                      struct nfsd4_secinfo *secinfo)
 826 {
 827         DECODE_HEAD;
 828
 829         READ_BUF(4);
 830         READ32(secinfo->si_namelen);
 831         READ_BUF(secinfo->si_namelen);
 832         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 833         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 834                                                                 nfserr_noent);
 835         if (status)
 836                 return status;
 837         DECODE_TAIL;
 838 }
 839
 840 static __be32
 841 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 842 {
 843         DECODE_HEAD;
 844
 845         READ_BUF(sizeof(stateid_t));
 846         READ32(setattr->sa_stateid.si_generation);
 847         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 848         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 849                 goto out;
 850
 851         DECODE_TAIL;
 852 }
 853
 854 static __be32
 855 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 856 {
 857         DECODE_HEAD;
 858
 859         READ_BUF(12);
 860         COPYMEM(setclientid->se_verf.data, 8);
 861         READ32(setclientid->se_namelen);
 862
 863         READ_BUF(setclientid->se_namelen + 8);
 864         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 865         READ32(setclientid->se_callback_prog);
 866         READ32(setclientid->se_callback_netid_len);
 867
 868         READ_BUF(setclientid->se_callback_netid_len + 4);
 869         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 870         READ32(setclientid->se_callback_addr_len);
 871
 872         READ_BUF(setclientid->se_callback_addr_len + 4);
 873         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 874         READ32(setclientid->se_callback_ident);
 875
 876         DECODE_TAIL;
 877 }
 878
 879 static __be32
 880 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 881 {
 882         DECODE_HEAD;
 883
 884         READ_BUF(8 + sizeof(nfs4_verifier));
 885         COPYMEM(&scd_c->sc_clientid, 8);
 886         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 887
 888         DECODE_TAIL;
 889 }
 890
 891 /* Also used for NVERIFY */
 892 static __be32
 893 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 894 {
 895 #if 0
 896         struct nfsd4_compoundargs save = {
 897                 .p = argp->p,
 898                 .end = argp->end,
 899                 .rqstp = argp->rqstp,
 900         };
 901         u32             ve_bmval[2];
 902         struct iattr    ve_iattr;           /* request */
 903         struct nfs4_acl *ve_acl;            /* request */
 904 #endif
 905         DECODE_HEAD;
 906
 907         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 908                 goto out;
 909
 910         /* For convenience's sake, we compare raw xdr'd attributes in
 911          * nfsd4_proc_verify; however we still decode here just to return
 912          * correct error in case of bad xdr. */
 913 #if 0
 914         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 915         if (status == nfserr_inval) {
 916                 status = nfserrno(status);
 917                 goto out;
 918         }
 919 #endif
 920         READ_BUF(4);
 921         READ32(verify->ve_attrlen);
 922         READ_BUF(verify->ve_attrlen);
 923         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 924
 925         DECODE_TAIL;
 926 }
 927
 928 static __be32
 929 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 930 {
 931         int avail;
 932         int v;
 933         int len;
 934         DECODE_HEAD;
 935
 936         READ_BUF(sizeof(stateid_opaque_t) + 20);
 937         READ32(write->wr_stateid.si_generation);
 938         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
 939         READ64(write->wr_offset);
 940         READ32(write->wr_stable_how);
 941         if (write->wr_stable_how > 2)
 942                 goto xdr_error;
 943         READ32(write->wr_buflen);
 944
 945         /* Sorry .. no magic macros for this.. *
 946          * READ_BUF(write->wr_buflen);
 947          * SAVEMEM(write->wr_buf, write->wr_buflen);
 948          */
 949         avail = (char*)argp->end - (char*)argp->p;
 950         if (avail + argp->pagelen < write->wr_buflen) {
 951                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__);
 952                 goto xdr_error;
 953         }
 954         argp->rqstp->rq_vec[0].iov_base = p;
 955         argp->rqstp->rq_vec[0].iov_len = avail;
 956         v = 0;
 957         len = write->wr_buflen;
 958         while (len > argp->rqstp->rq_vec[v].iov_len) {
 959                 len -= argp->rqstp->rq_vec[v].iov_len;
 960                 v++;
 961                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 962                 argp->pagelist++;
 963                 if (argp->pagelen >= PAGE_SIZE) {
 964                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 965                         argp->pagelen -= PAGE_SIZE;
 966                 } else {
 967                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 968                         argp->pagelen -= len;
 969                 }
 970         }
 971         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 972         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 973         argp->rqstp->rq_vec[v].iov_len = len;
 974         write->wr_vlen = v+1;
 975
 976         DECODE_TAIL;
 977 }
 978
 979 static __be32
 980 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 981 {
 982         DECODE_HEAD;
 983
 984         READ_BUF(12);
 985         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 986         READ32(rlockowner->rl_owner.len);
 987         READ_BUF(rlockowner->rl_owner.len);
 988         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 989
 990         DECODE_TAIL;
 991 }
 992
 993 static __be32
 994 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 995 {
 996         DECODE_HEAD;
 997         struct nfsd4_op *op;
 998         int i;
 999
1000         /*
1001          * XXX: According to spec, we should check the tag
1002          * for UTF-8 compliance.  I'm postponing this for
1003          * now because it seems that some clients do use
1004          * binary tags.
1005          */
1006         READ_BUF(4);
1007         READ32(argp->taglen);
1008         READ_BUF(argp->taglen + 8);
1009         SAVEMEM(argp->tag, argp->taglen);
1010         READ32(argp->minorversion);
1011         READ32(argp->opcnt);
1012
1013         if (argp->taglen > NFSD4_MAX_TAGLEN)
1014                 goto xdr_error;
1015         if (argp->opcnt > 100)
1016                 goto xdr_error;
1017
1018         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1019                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1020                 if (!argp->ops) {
1021                         argp->ops = argp->iops;
1022                         printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
1023                         goto xdr_error;
1024                 }
1025         }
1026
1027         for (i = 0; i < argp->opcnt; i++) {
1028                 op = &argp->ops[i];
1029                 op->replay = NULL;
1030
1031                 /*
1032                  * We can't use READ_BUF() here because we need to handle
1033                  * a missing opcode as an OP_WRITE + 1. So we need to check
1034                  * to see if we're truly at the end of our buffer or if there
1035                  * is another page we need to flip to.
1036                  */
1037
1038                 if (argp->p == argp->end) {
1039                         if (argp->pagelen < 4) {
1040                                 /* There isn't an opcode still on the wire */
1041                                 op->opnum = OP_WRITE + 1;
1042                                 op->status = nfserr_bad_xdr;
1043                                 argp->opcnt = i+1;
1044                                 break;
1045                         }
1046
1047                         /*
1048                          * False alarm. We just hit a page boundary, but there
1049                          * is still data available.  Move pointer across page
1050                          * boundary.  *snip from READ_BUF*
1051                          */
1052                         argp->p = page_address(argp->pagelist[0]);
1053                         argp->pagelist++;
1054                         if (argp->pagelen < PAGE_SIZE) {
1055                                 argp->end = p + (argp->pagelen>>2);
1056                                 argp->pagelen = 0;
1057                         } else {
1058                                 argp->end = p + (PAGE_SIZE>>2);
1059                                 argp->pagelen -= PAGE_SIZE;
1060                         }
1061                 }
1062                 op->opnum = ntohl(*argp->p++);
1063
1064                 switch (op->opnum) {
1065                 case 2: /* Reserved operation */
1066                         op->opnum = OP_ILLEGAL;
1067                         if (argp->minorversion == 0)
1068                                 op->status = nfserr_op_illegal;
1069                         else
1070                                 op->status = nfserr_minor_vers_mismatch;
1071                         break;
1072                 case OP_ACCESS:
1073                         op->status = nfsd4_decode_access(argp, &op->u.access);
1074                         break;
1075                 case OP_CLOSE:
1076                         op->status = nfsd4_decode_close(argp, &op->u.close);
1077                         break;
1078                 case OP_COMMIT:
1079                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1080                         break;
1081                 case OP_CREATE:
1082                         op->status = nfsd4_decode_create(argp, &op->u.create);
1083                         break;
1084                 case OP_DELEGRETURN:
1085                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1086                         break;
1087                 case OP_GETATTR:
1088                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1089                         break;
1090                 case OP_GETFH:
1091                         op->status = nfs_ok;
1092                         break;
1093                 case OP_LINK:
1094                         op->status = nfsd4_decode_link(argp, &op->u.link);
1095                         break;
1096                 case OP_LOCK:
1097                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1098                         break;
1099                 case OP_LOCKT:
1100                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1101                         break;
1102                 case OP_LOCKU:
1103                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1104                         break;
1105                 case OP_LOOKUP:
1106                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1107                         break;
1108                 case OP_LOOKUPP:
1109                         op->status = nfs_ok;
1110                         break;
1111                 case OP_NVERIFY:
1112                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1113                         break;
1114                 case OP_OPEN:
1115                         op->status = nfsd4_decode_open(argp, &op->u.open);
1116                         break;
1117                 case OP_OPEN_CONFIRM:
1118                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1119                         break;
1120                 case OP_OPEN_DOWNGRADE:
1121                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1122                         break;
1123                 case OP_PUTFH:
1124                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1125                         break;
1126                 case OP_PUTROOTFH:
1127                         op->status = nfs_ok;
1128                         break;
1129                 case OP_READ:
1130                         op->status = nfsd4_decode_read(argp, &op->u.read);
1131                         break;
1132                 case OP_READDIR:
1133                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1134                         break;
1135                 case OP_READLINK:
1136                         op->status = nfs_ok;
1137                         break;
1138                 case OP_REMOVE:
1139                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1140                         break;
1141                 case OP_RENAME:
1142                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1143                         break;
1144                 case OP_RESTOREFH:
1145                         op->status = nfs_ok;
1146                         break;
1147                 case OP_RENEW:
1148                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1149                         break;
1150                 case OP_SAVEFH:
1151                         op->status = nfs_ok;
1152                         break;
1153                 case OP_SECINFO:
1154                         op->status = nfsd4_decode_secinfo(argp, &op->u.secinfo);
1155                         break;
1156                 case OP_SETATTR:
1157                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1158                         break;
1159                 case OP_SETCLIENTID:
1160                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1161                         break;
1162                 case OP_SETCLIENTID_CONFIRM:
1163                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1164                         break;
1165                 case OP_VERIFY:
1166                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1167                         break;
1168                 case OP_WRITE:
1169                         op->status = nfsd4_decode_write(argp, &op->u.write);
1170                         break;
1171                 case OP_RELEASE_LOCKOWNER:
1172                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1173                         break;
1174                 default:
1175                         op->opnum = OP_ILLEGAL;
1176                         op->status = nfserr_op_illegal;
1177                         break;
1178                 }
1179
1180                 if (op->status) {
1181                         argp->opcnt = i+1;
1182                         break;
1183                 }
1184         }
1185
1186         DECODE_TAIL;
1187 }
1188 /*
1189  * END OF "GENERIC" DECODE ROUTINES.
1190  */
1191
1192 /*
1193  * START OF "GENERIC" ENCODE ROUTINES.
1194  *   These may look a little ugly since they are imported from a "generic"
1195  * set of XDR encode/decode routines which are intended to be shared by
1196  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1197  *
1198  * If the pain of reading these is too great, it should be a straightforward
1199  * task to translate them into Linux-specific versions which are more
1200  * consistent with the style used in NFSv2/v3...
1201  */
1202 #define ENCODE_HEAD              __be32 *p
1203
1204 #define WRITE32(n)               *p++ = htonl(n)
1205 #define WRITE64(n)               do {                           \
1206         *p++ = htonl((u32)((n) >> 32));                         \
1207         *p++ = htonl((u32)(n));                                 \
1208 } while (0)
1209 #define WRITEMEM(ptr,nbytes)     do {                           \
1210         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1211         memcpy(p, ptr, nbytes);                                 \
1212         p += XDR_QUADLEN(nbytes);                               \
1213 } while (0)
1214 #define WRITECINFO(c)           do {                            \
1215         *p++ = htonl(c.atomic);                                 \
1216         *p++ = htonl(c.before_ctime_sec);                               \
1217         *p++ = htonl(c.before_ctime_nsec);                              \
1218         *p++ = htonl(c.after_ctime_sec);                                \
1219         *p++ = htonl(c.after_ctime_nsec);                               \
1220 } while (0)
1221
1222 #define RESERVE_SPACE(nbytes)   do {                            \
1223         p = resp->p;                                            \
1224         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1225 } while (0)
1226 #define ADJUST_ARGS()           resp->p = p
1227
1228 /*
1229  * Header routine to setup seqid operation replay cache
1230  */
1231 #define ENCODE_SEQID_OP_HEAD                                    \
1232         __be32 *p;                                              \
1233         __be32 *save;                                           \
1234                                                                 \
1235         save = resp->p;
1236
1237 /*
1238  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1239  * is where sequence id's are incremented, and the replay cache is filled.
1240  * Note that we increment sequence id's here, at the last moment, so we're sure
1241  * we know whether the error to be returned is a sequence id mutating error.
1242  */
1243
1244 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1245         if (seqid_mutating_err(nfserr) && stateowner) {         \
1246                 stateowner->so_seqid++;                         \
1247                 stateowner->so_replay.rp_status = nfserr;       \
1248                 stateowner->so_replay.rp_buflen =               \
1249                           (((char *)(resp)->p - (char *)save)); \
1250                 memcpy(stateowner->so_replay.rp_buf, save,      \
1251                         stateowner->so_replay.rp_buflen);       \
1252         } } while (0);
1253
1254 /* Encode as an array of strings the string given with components
1255  * seperated @sep.
1256  */
1257 static __be32 nfsd4_encode_components(char sep, char *components,
1258                                    __be32 **pp, int *buflen)
1259 {
1260         __be32 *p = *pp;
1261         __be32 *countp = p;
1262         int strlen, count=0;
1263         char *str, *end;
1264
1265         dprintk("nfsd4_encode_components(%s)\n", components);
1266         if ((*buflen -= 4) < 0)
1267                 return nfserr_resource;
1268         WRITE32(0); /* We will fill this in with @count later */
1269         end = str = components;
1270         while (*end) {
1271                 for (; *end && (*end != sep); end++)
1272                         ; /* Point to end of component */
1273                 strlen = end - str;
1274                 if (strlen) {
1275                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1276                                 return nfserr_resource;
1277                         WRITE32(strlen);
1278                         WRITEMEM(str, strlen);
1279                         count++;
1280                 }
1281                 else
1282                         end++;
1283                 str = end;
1284         }
1285         *pp = p;
1286         p = countp;
1287         WRITE32(count);
1288         return 0;
1289 }
1290
1291 /*
1292  * encode a location element of a fs_locations structure
1293  */
1294 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1295                                     __be32 **pp, int *buflen)
1296 {
1297         __be32 status;
1298         __be32 *p = *pp;
1299
1300         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1301         if (status)
1302                 return status;
1303         status = nfsd4_encode_components('/', location->path, &p, buflen);
1304         if (status)
1305                 return status;
1306         *pp = p;
1307         return 0;
1308 }
1309
1310 /*
1311  * Return the path to an export point in the pseudo filesystem namespace
1312  * Returned string is safe to use as long as the caller holds a reference
1313  * to @exp.
1314  */
1315 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1316 {
1317         struct svc_fh tmp_fh;
1318         char *path, *rootpath;
1319
1320         fh_init(&tmp_fh, NFS4_FHSIZE);
1321         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1322         if (*stat)
1323                 return NULL;
1324         rootpath = tmp_fh.fh_export->ex_path;
1325
1326         path = exp->ex_path;
1327
1328         if (strncmp(path, rootpath, strlen(rootpath))) {
1329                 printk("nfsd: fs_locations failed;"
1330                         "%s is not contained in %s\n", path, rootpath);
1331                 *stat = nfserr_notsupp;
1332                 return NULL;
1333         }
1334
1335         return path + strlen(rootpath);
1336 }
1337
1338 /*
1339  *  encode a fs_locations structure
1340  */
1341 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1342                                      struct svc_export *exp,
1343                                      __be32 **pp, int *buflen)
1344 {
1345         __be32 status;
1346         int i;
1347         __be32 *p = *pp;
1348         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1349         char *root = nfsd4_path(rqstp, exp, &status);
1350
1351         if (status)
1352                 return status;
1353         status = nfsd4_encode_components('/', root, &p, buflen);
1354         if (status)
1355                 return status;
1356         if ((*buflen -= 4) < 0)
1357                 return nfserr_resource;
1358         WRITE32(fslocs->locations_count);
1359         for (i=0; i<fslocs->locations_count; i++) {
1360                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1361                                                    &p, buflen);
1362                 if (status)
1363                         return status;
1364         }
1365         *pp = p;
1366         return 0;
1367 }
1368
1369 static u32 nfs4_ftypes[16] = {
1370         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1371         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1372         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1373         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1374 };
1375
1376 static __be32
1377 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1378                         __be32 **p, int *buflen)
1379 {
1380         int status;
1381
1382         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1383                 return nfserr_resource;
1384         if (whotype != NFS4_ACL_WHO_NAMED)
1385                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1386         else if (group)
1387                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1388         else
1389                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1390         if (status < 0)
1391                 return nfserrno(status);
1392         *p = xdr_encode_opaque(*p, NULL, status);
1393         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1394         BUG_ON(*buflen < 0);
1395         return 0;
1396 }
1397
1398 static inline __be32
1399 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1400 {
1401         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1402 }
1403
1404 static inline __be32
1405 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1406 {
1407         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1408 }
1409
1410 static inline __be32
1411 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1412                 __be32 **p, int *buflen)
1413 {
1414         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1415 }
1416
1417 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1418                               FATTR4_WORD0_RDATTR_ERROR)
1419 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1420
1421 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1422 {
1423         /* As per referral draft:  */
1424         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1425             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1426                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1427                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1428                         *rdattr_err = NFSERR_MOVED;
1429                 else
1430                         return nfserr_moved;
1431         }
1432         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1433         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1434         return 0;
1435 }
1436
1437 /*
1438  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1439  * ourselves.
1440  *
1441  * @countp is the buffer size in _words_; upon successful return this becomes
1442  * replaced with the number of words written.
1443  */
1444 __be32
1445 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1446                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1447                 struct svc_rqst *rqstp)
1448 {
1449         u32 bmval0 = bmval[0];
1450         u32 bmval1 = bmval[1];
1451         struct kstat stat;
1452         struct svc_fh tempfh;
1453         struct kstatfs statfs;
1454         int buflen = *countp << 2;
1455         __be32 *attrlenp;
1456         u32 dummy;
1457         u64 dummy64;
1458         u32 rdattr_err = 0;
1459         __be32 *p = buffer;
1460         __be32 status;
1461         int err;
1462         int aclsupport = 0;
1463         struct nfs4_acl *acl = NULL;
1464
1465         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1466         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1467         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1468
1469         if (exp->ex_fslocs.migrated) {
1470                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1471                 if (status)
1472                         goto out;
1473         }
1474
1475         err = vfs_getattr(exp->ex_mnt, dentry, &stat);
1476         if (err)
1477                 goto out_nfserr;
1478         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1479             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1480                        FATTR4_WORD1_SPACE_TOTAL))) {
1481                 err = vfs_statfs(dentry, &statfs);
1482                 if (err)
1483                         goto out_nfserr;
1484         }
1485         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1486                 fh_init(&tempfh, NFS4_FHSIZE);
1487                 status = fh_compose(&tempfh, exp, dentry, NULL);
1488                 if (status)
1489                         goto out;
1490                 fhp = &tempfh;
1491         }
1492         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1493                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1494                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1495                 aclsupport = (err == 0);
1496                 if (bmval0 & FATTR4_WORD0_ACL) {
1497                         if (err == -EOPNOTSUPP)
1498                                 bmval0 &= ~FATTR4_WORD0_ACL;
1499                         else if (err == -EINVAL) {
1500                                 status = nfserr_attrnotsupp;
1501                                 goto out;
1502                         } else if (err != 0)
1503                                 goto out_nfserr;
1504                 }
1505         }
1506         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1507                 if (exp->ex_fslocs.locations == NULL) {
1508                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1509                 }
1510         }
1511         if ((buflen -= 16) < 0)
1512                 goto out_resource;
1513
1514         WRITE32(2);
1515         WRITE32(bmval0);
1516         WRITE32(bmval1);
1517         attrlenp = p++;                /* to be backfilled later */
1518
1519         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1520                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1521                 if ((buflen -= 12) < 0)
1522                         goto out_resource;
1523                 if (!aclsupport)
1524                         word0 &= ~FATTR4_WORD0_ACL;
1525                 if (!exp->ex_fslocs.locations)
1526                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1527                 WRITE32(2);
1528                 WRITE32(word0);
1529                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1530         }
1531         if (bmval0 & FATTR4_WORD0_TYPE) {
1532                 if ((buflen -= 4) < 0)
1533                         goto out_resource;
1534                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1535                 if (dummy == NF4BAD)
1536                         goto out_serverfault;
1537                 WRITE32(dummy);
1538         }
1539         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1540                 if ((buflen -= 4) < 0)
1541                         goto out_resource;
1542                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1543                         WRITE32(NFS4_FH_PERSISTENT);
1544                 else
1545                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1546         }
1547         if (bmval0 & FATTR4_WORD0_CHANGE) {
1548                 /*
1549                  * Note: This _must_ be consistent with the scheme for writing
1550                  * change_info, so any changes made here must be reflected there
1551                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1552                  * macro above.)
1553                  */
1554                 if ((buflen -= 8) < 0)
1555                         goto out_resource;
1556                 WRITE32(stat.ctime.tv_sec);
1557                 WRITE32(stat.ctime.tv_nsec);
1558         }
1559         if (bmval0 & FATTR4_WORD0_SIZE) {
1560                 if ((buflen -= 8) < 0)
1561                         goto out_resource;
1562                 WRITE64(stat.size);
1563         }
1564         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1565                 if ((buflen -= 4) < 0)
1566                         goto out_resource;
1567                 WRITE32(1);
1568         }
1569         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1570                 if ((buflen -= 4) < 0)
1571                         goto out_resource;
1572                 WRITE32(1);
1573         }
1574         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1575                 if ((buflen -= 4) < 0)
1576                         goto out_resource;
1577                 WRITE32(0);
1578         }
1579         if (bmval0 & FATTR4_WORD0_FSID) {
1580                 if ((buflen -= 16) < 0)
1581                         goto out_resource;
1582                 if (exp->ex_fslocs.migrated) {
1583                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1584                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1585                 } else switch(fsid_source(fhp)) {
1586                 case FSIDSOURCE_FSID:
1587                         WRITE64((u64)exp->ex_fsid);
1588                         WRITE64((u64)0);
1589                         break;
1590                 case FSIDSOURCE_DEV:
1591                         WRITE32(0);
1592                         WRITE32(MAJOR(stat.dev));
1593                         WRITE32(0);
1594                         WRITE32(MINOR(stat.dev));
1595                         break;
1596                 case FSIDSOURCE_UUID:
1597                         WRITEMEM(exp->ex_uuid, 16);
1598                         break;
1599                 }
1600         }
1601         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1602                 if ((buflen -= 4) < 0)
1603                         goto out_resource;
1604                 WRITE32(0);
1605         }
1606         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1607                 if ((buflen -= 4) < 0)
1608                         goto out_resource;
1609                 WRITE32(NFSD_LEASE_TIME);
1610         }
1611         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1612                 if ((buflen -= 4) < 0)
1613                         goto out_resource;
1614                 WRITE32(rdattr_err);
1615         }
1616         if (bmval0 & FATTR4_WORD0_ACL) {
1617                 struct nfs4_ace *ace;
1618
1619                 if (acl == NULL) {
1620                         if ((buflen -= 4) < 0)
1621                                 goto out_resource;
1622
1623                         WRITE32(0);
1624                         goto out_acl;
1625                 }
1626                 if ((buflen -= 4) < 0)
1627                         goto out_resource;
1628                 WRITE32(acl->naces);
1629
1630                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1631                         if ((buflen -= 4*3) < 0)
1632                                 goto out_resource;
1633                         WRITE32(ace->type);
1634                         WRITE32(ace->flag);
1635                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1636                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1637                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1638                                 &p, &buflen);
1639                         if (status == nfserr_resource)
1640                                 goto out_resource;
1641                         if (status)
1642                                 goto out;
1643                 }
1644         }
1645 out_acl:
1646         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1647                 if ((buflen -= 4) < 0)
1648                         goto out_resource;
1649                 WRITE32(aclsupport ?
1650                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1651         }
1652         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1653                 if ((buflen -= 4) < 0)
1654                         goto out_resource;
1655                 WRITE32(1);
1656         }
1657         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1658                 if ((buflen -= 4) < 0)
1659                         goto out_resource;
1660                 WRITE32(1);
1661         }
1662         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1663                 if ((buflen -= 4) < 0)
1664                         goto out_resource;
1665                 WRITE32(1);
1666         }
1667         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1668                 if ((buflen -= 4) < 0)
1669                         goto out_resource;
1670                 WRITE32(1);
1671         }
1672         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1673                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1674                 if (buflen < 0)
1675                         goto out_resource;
1676                 WRITE32(fhp->fh_handle.fh_size);
1677                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1678         }
1679         if (bmval0 & FATTR4_WORD0_FILEID) {
1680                 if ((buflen -= 8) < 0)
1681                         goto out_resource;
1682                 WRITE64((u64) stat.ino);
1683         }
1684         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1685                 if ((buflen -= 8) < 0)
1686                         goto out_resource;
1687                 WRITE64((u64) statfs.f_ffree);
1688         }
1689         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1690                 if ((buflen -= 8) < 0)
1691                         goto out_resource;
1692                 WRITE64((u64) statfs.f_ffree);
1693         }
1694         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1695                 if ((buflen -= 8) < 0)
1696                         goto out_resource;
1697                 WRITE64((u64) statfs.f_files);
1698         }
1699         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1700                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1701                 if (status == nfserr_resource)
1702                         goto out_resource;
1703                 if (status)
1704                         goto out;
1705         }
1706         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1707                 if ((buflen -= 4) < 0)
1708                         goto out_resource;
1709                 WRITE32(1);
1710         }
1711         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1712                 if ((buflen -= 8) < 0)
1713                         goto out_resource;
1714                 WRITE64(~(u64)0);
1715         }
1716         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1717                 if ((buflen -= 4) < 0)
1718                         goto out_resource;
1719                 WRITE32(255);
1720         }
1721         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1722                 if ((buflen -= 4) < 0)
1723                         goto out_resource;
1724                 WRITE32(~(u32) 0);
1725         }
1726         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1727                 if ((buflen -= 8) < 0)
1728                         goto out_resource;
1729                 WRITE64((u64) svc_max_payload(rqstp));
1730         }
1731         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1732                 if ((buflen -= 8) < 0)
1733                         goto out_resource;
1734                 WRITE64((u64) svc_max_payload(rqstp));
1735         }
1736         if (bmval1 & FATTR4_WORD1_MODE) {
1737                 if ((buflen -= 4) < 0)
1738                         goto out_resource;
1739                 WRITE32(stat.mode & S_IALLUGO);
1740         }
1741         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1742                 if ((buflen -= 4) < 0)
1743                         goto out_resource;
1744                 WRITE32(1);
1745         }
1746         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1747                 if ((buflen -= 4) < 0)
1748                         goto out_resource;
1749                 WRITE32(stat.nlink);
1750         }
1751         if (bmval1 & FATTR4_WORD1_OWNER) {
1752                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1753                 if (status == nfserr_resource)
1754                         goto out_resource;
1755                 if (status)
1756                         goto out;
1757         }
1758         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1759                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1760                 if (status == nfserr_resource)
1761                         goto out_resource;
1762                 if (status)
1763                         goto out;
1764         }
1765         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1766                 if ((buflen -= 8) < 0)
1767                         goto out_resource;
1768                 WRITE32((u32) MAJOR(stat.rdev));
1769                 WRITE32((u32) MINOR(stat.rdev));
1770         }
1771         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1772                 if ((buflen -= 8) < 0)
1773                         goto out_resource;
1774                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1775                 WRITE64(dummy64);
1776         }
1777         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1778                 if ((buflen -= 8) < 0)
1779                         goto out_resource;
1780                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1781                 WRITE64(dummy64);
1782         }
1783         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1784                 if ((buflen -= 8) < 0)
1785                         goto out_resource;
1786                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1787                 WRITE64(dummy64);
1788         }
1789         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1790                 if ((buflen -= 8) < 0)
1791                         goto out_resource;
1792                 dummy64 = (u64)stat.blocks << 9;
1793                 WRITE64(dummy64);
1794         }
1795         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1796                 if ((buflen -= 12) < 0)
1797                         goto out_resource;
1798                 WRITE32(0);
1799                 WRITE32(stat.atime.tv_sec);
1800                 WRITE32(stat.atime.tv_nsec);
1801         }
1802         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1803                 if ((buflen -= 12) < 0)
1804                         goto out_resource;
1805                 WRITE32(0);
1806                 WRITE32(1);
1807                 WRITE32(0);
1808         }
1809         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1810                 if ((buflen -= 12) < 0)
1811                         goto out_resource;
1812                 WRITE32(0);
1813                 WRITE32(stat.ctime.tv_sec);
1814                 WRITE32(stat.ctime.tv_nsec);
1815         }
1816         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1817                 if ((buflen -= 12) < 0)
1818                         goto out_resource;
1819                 WRITE32(0);
1820                 WRITE32(stat.mtime.tv_sec);
1821                 WRITE32(stat.mtime.tv_nsec);
1822         }
1823         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1824                 struct dentry *mnt_pnt, *mnt_root;
1825
1826                 if ((buflen -= 8) < 0)
1827                         goto out_resource;
1828                 mnt_root = exp->ex_mnt->mnt_root;
1829                 if (mnt_root->d_inode == dentry->d_inode) {
1830                         mnt_pnt = exp->ex_mnt->mnt_mountpoint;
1831                         WRITE64((u64) mnt_pnt->d_inode->i_ino);
1832                 } else
1833                         WRITE64((u64) stat.ino);
1834         }
1835         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1836         *countp = p - buffer;
1837         status = nfs_ok;
1838
1839 out:
1840         kfree(acl);
1841         if (fhp == &tempfh)
1842                 fh_put(&tempfh);
1843         return status;
1844 out_nfserr:
1845         status = nfserrno(err);
1846         goto out;
1847 out_resource:
1848         *countp = 0;
1849         status = nfserr_resource;
1850         goto out;
1851 out_serverfault:
1852         status = nfserr_serverfault;
1853         goto out;
1854 }
1855
1856 static __be32
1857 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1858                 const char *name, int namlen, __be32 *p, int *buflen)
1859 {
1860         struct svc_export *exp = cd->rd_fhp->fh_export;
1861         struct dentry *dentry;
1862         __be32 nfserr;
1863
1864         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1865         if (IS_ERR(dentry))
1866                 return nfserrno(PTR_ERR(dentry));
1867
1868         exp_get(exp);
1869         if (d_mountpoint(dentry)) {
1870                 int err;
1871
1872                 /*
1873                  * Why the heck aren't we just using nfsd_lookup??
1874                  * Different "."/".." handling?  Something else?
1875                  * At least, add a comment here to explain....
1876                  */
1877                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1878                 if (err) {
1879                         nfserr = nfserrno(err);
1880                         goto out_put;
1881                 }
1882                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
1883                 if (nfserr)
1884                         goto out_put;
1885
1886         }
1887         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1888                                         cd->rd_rqstp);
1889 out_put:
1890         dput(dentry);
1891         exp_put(exp);
1892         return nfserr;
1893 }
1894
1895 static __be32 *
1896 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1897 {
1898         __be32 *attrlenp;
1899
1900         if (buflen < 6)
1901                 return NULL;
1902         *p++ = htonl(2);
1903         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1904         *p++ = htonl(0);                         /* bmval1 */
1905
1906         attrlenp = p++;
1907         *p++ = nfserr;       /* no htonl */
1908         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1909         return p;
1910 }
1911
1912 static int
1913 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1914                     loff_t offset, u64 ino, unsigned int d_type)
1915 {
1916         struct readdir_cd *ccd = ccdv;
1917         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1918         int buflen;
1919         __be32 *p = cd->buffer;
1920         __be32 nfserr = nfserr_toosmall;
1921
1922         /* In nfsv4, "." and ".." never make it onto the wire.. */
1923         if (name && isdotent(name, namlen)) {
1924                 cd->common.err = nfs_ok;
1925                 return 0;
1926         }
1927
1928         if (cd->offset)
1929                 xdr_encode_hyper(cd->offset, (u64) offset);
1930
1931         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1932         if (buflen < 0)
1933                 goto fail;
1934
1935         *p++ = xdr_one;                             /* mark entry present */
1936         cd->offset = p;                             /* remember pointer */
1937         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1938         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1939
1940         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1941         switch (nfserr) {
1942         case nfs_ok:
1943                 p += buflen;
1944                 break;
1945         case nfserr_resource:
1946                 nfserr = nfserr_toosmall;
1947                 goto fail;
1948         case nfserr_dropit:
1949                 goto fail;
1950         default:
1951                 /*
1952                  * If the client requested the RDATTR_ERROR attribute,
1953                  * we stuff the error code into this attribute
1954                  * and continue.  If this attribute was not requested,
1955                  * then in accordance with the spec, we fail the
1956                  * entire READDIR operation(!)
1957                  */
1958                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1959                         goto fail;
1960                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1961                 if (p == NULL) {
1962                         nfserr = nfserr_toosmall;
1963                         goto fail;
1964                 }
1965         }
1966         cd->buflen -= (p - cd->buffer);
1967         cd->buffer = p;
1968         cd->common.err = nfs_ok;
1969         return 0;
1970 fail:
1971         cd->common.err = nfserr;
1972         return -EINVAL;
1973 }
1974
1975 static void
1976 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1977 {
1978         ENCODE_HEAD;
1979
1980         if (!nfserr) {
1981                 RESERVE_SPACE(8);
1982                 WRITE32(access->ac_supported);
1983                 WRITE32(access->ac_resp_access);
1984                 ADJUST_ARGS();
1985         }
1986 }
1987
1988 static void
1989 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1990 {
1991         ENCODE_SEQID_OP_HEAD;
1992
1993         if (!nfserr) {
1994                 RESERVE_SPACE(sizeof(stateid_t));
1995                 WRITE32(close->cl_stateid.si_generation);
1996                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1997                 ADJUST_ARGS();
1998         }
1999         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2000 }
2001
2002
2003 static void
2004 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2005 {
2006         ENCODE_HEAD;
2007
2008         if (!nfserr) {
2009                 RESERVE_SPACE(8);
2010                 WRITEMEM(commit->co_verf.data, 8);
2011                 ADJUST_ARGS();
2012         }
2013 }
2014
2015 static void
2016 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2017 {
2018         ENCODE_HEAD;
2019
2020         if (!nfserr) {
2021                 RESERVE_SPACE(32);
2022                 WRITECINFO(create->cr_cinfo);
2023                 WRITE32(2);
2024                 WRITE32(create->cr_bmval[0]);
2025                 WRITE32(create->cr_bmval[1]);
2026                 ADJUST_ARGS();
2027         }
2028 }
2029
2030 static __be32
2031 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2032 {
2033         struct svc_fh *fhp = getattr->ga_fhp;
2034         int buflen;
2035
2036         if (nfserr)
2037                 return nfserr;
2038
2039         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2040         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2041                                     resp->p, &buflen, getattr->ga_bmval,
2042                                     resp->rqstp);
2043         if (!nfserr)
2044                 resp->p += buflen;
2045         return nfserr;
2046 }
2047
2048 static void
2049 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh *fhp)
2050 {
2051         unsigned int len;
2052         ENCODE_HEAD;
2053
2054         if (!nfserr) {
2055                 len = fhp->fh_handle.fh_size;
2056                 RESERVE_SPACE(len + 4);
2057                 WRITE32(len);
2058                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2059                 ADJUST_ARGS();
2060         }
2061 }
2062
2063 /*
2064 * Including all fields other than the name, a LOCK4denied structure requires
2065 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2066 */
2067 static void
2068 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2069 {
2070         ENCODE_HEAD;
2071
2072         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2073         WRITE64(ld->ld_start);
2074         WRITE64(ld->ld_length);
2075         WRITE32(ld->ld_type);
2076         if (ld->ld_sop) {
2077                 WRITEMEM(&ld->ld_clientid, 8);
2078                 WRITE32(ld->ld_sop->so_owner.len);
2079                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2080                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2081         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2082                 WRITE64((u64)0); /* clientid */
2083                 WRITE32(0); /* length of owner name */
2084         }
2085         ADJUST_ARGS();
2086 }
2087
2088 static void
2089 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2090 {
2091         ENCODE_SEQID_OP_HEAD;
2092
2093         if (!nfserr) {
2094                 RESERVE_SPACE(4 + sizeof(stateid_t));
2095                 WRITE32(lock->lk_resp_stateid.si_generation);
2096                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2097                 ADJUST_ARGS();
2098         } else if (nfserr == nfserr_denied)
2099                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2100
2101         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2102 }
2103
2104 static void
2105 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2106 {
2107         if (nfserr == nfserr_denied)
2108                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2109 }
2110
2111 static void
2112 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2113 {
2114         ENCODE_SEQID_OP_HEAD;
2115
2116         if (!nfserr) {
2117                 RESERVE_SPACE(sizeof(stateid_t));
2118                 WRITE32(locku->lu_stateid.si_generation);
2119                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2120                 ADJUST_ARGS();
2121         }
2122
2123         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2124 }
2125
2126
2127 static void
2128 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2129 {
2130         ENCODE_HEAD;
2131
2132         if (!nfserr) {
2133                 RESERVE_SPACE(20);
2134                 WRITECINFO(link->li_cinfo);
2135                 ADJUST_ARGS();
2136         }
2137 }
2138
2139
2140 static void
2141 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2142 {
2143         ENCODE_SEQID_OP_HEAD;
2144
2145         if (nfserr)
2146                 goto out;
2147
2148         RESERVE_SPACE(36 + sizeof(stateid_t));
2149         WRITE32(open->op_stateid.si_generation);
2150         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2151         WRITECINFO(open->op_cinfo);
2152         WRITE32(open->op_rflags);
2153         WRITE32(2);
2154         WRITE32(open->op_bmval[0]);
2155         WRITE32(open->op_bmval[1]);
2156         WRITE32(open->op_delegate_type);
2157         ADJUST_ARGS();
2158
2159         switch (open->op_delegate_type) {
2160         case NFS4_OPEN_DELEGATE_NONE:
2161                 break;
2162         case NFS4_OPEN_DELEGATE_READ:
2163                 RESERVE_SPACE(20 + sizeof(stateid_t));
2164                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2165                 WRITE32(open->op_recall);
2166
2167                 /*
2168                  * TODO: ACE's in delegations
2169                  */
2170                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2171                 WRITE32(0);
2172                 WRITE32(0);
2173                 WRITE32(0);   /* XXX: is NULL principal ok? */
2174                 ADJUST_ARGS();
2175                 break;
2176         case NFS4_OPEN_DELEGATE_WRITE:
2177                 RESERVE_SPACE(32 + sizeof(stateid_t));
2178                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2179                 WRITE32(0);
2180
2181                 /*
2182                  * TODO: space_limit's in delegations
2183                  */
2184                 WRITE32(NFS4_LIMIT_SIZE);
2185                 WRITE32(~(u32)0);
2186                 WRITE32(~(u32)0);
2187
2188                 /*
2189                  * TODO: ACE's in delegations
2190                  */
2191                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2192                 WRITE32(0);
2193                 WRITE32(0);
2194                 WRITE32(0);   /* XXX: is NULL principal ok? */
2195                 ADJUST_ARGS();
2196                 break;
2197         default:
2198                 BUG();
2199         }
2200         /* XXX save filehandle here */
2201 out:
2202         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2203 }
2204
2205 static void
2206 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2207 {
2208         ENCODE_SEQID_OP_HEAD;
2209
2210         if (!nfserr) {
2211                 RESERVE_SPACE(sizeof(stateid_t));
2212                 WRITE32(oc->oc_resp_stateid.si_generation);
2213                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2214                 ADJUST_ARGS();
2215         }
2216
2217         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2218 }
2219
2220 static void
2221 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2222 {
2223         ENCODE_SEQID_OP_HEAD;
2224
2225         if (!nfserr) {
2226                 RESERVE_SPACE(sizeof(stateid_t));
2227                 WRITE32(od->od_stateid.si_generation);
2228                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2229                 ADJUST_ARGS();
2230         }
2231
2232         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2233 }
2234
2235 static __be32
2236 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2237                   struct nfsd4_read *read)
2238 {
2239         u32 eof;
2240         int v, pn;
2241         unsigned long maxcount;
2242         long len;
2243         ENCODE_HEAD;
2244
2245         if (nfserr)
2246                 return nfserr;
2247         if (resp->xbuf->page_len)
2248                 return nfserr_resource;
2249
2250         RESERVE_SPACE(8); /* eof flag and byte count */
2251
2252         maxcount = svc_max_payload(resp->rqstp);
2253         if (maxcount > read->rd_length)
2254                 maxcount = read->rd_length;
2255
2256         len = maxcount;
2257         v = 0;
2258         while (len > 0) {
2259                 pn = resp->rqstp->rq_resused++;
2260                 resp->rqstp->rq_vec[v].iov_base =
2261                         page_address(resp->rqstp->rq_respages[pn]);
2262                 resp->rqstp->rq_vec[v].iov_len =
2263                         len < PAGE_SIZE ? len : PAGE_SIZE;
2264                 v++;
2265                 len -= PAGE_SIZE;
2266         }
2267         read->rd_vlen = v;
2268
2269         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2270                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2271                         &maxcount);
2272
2273         if (nfserr == nfserr_symlink)
2274                 nfserr = nfserr_inval;
2275         if (nfserr)
2276                 return nfserr;
2277         eof = (read->rd_offset + maxcount >=
2278                read->rd_fhp->fh_dentry->d_inode->i_size);
2279
2280         WRITE32(eof);
2281         WRITE32(maxcount);
2282         ADJUST_ARGS();
2283         resp->xbuf->head[0].iov_len = (char*)p
2284                                         - (char*)resp->xbuf->head[0].iov_base;
2285         resp->xbuf->page_len = maxcount;
2286
2287         /* Use rest of head for padding and remaining ops: */
2288         resp->xbuf->tail[0].iov_base = p;
2289         resp->xbuf->tail[0].iov_len = 0;
2290         if (maxcount&3) {
2291                 RESERVE_SPACE(4);
2292                 WRITE32(0);
2293                 resp->xbuf->tail[0].iov_base += maxcount&3;
2294                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2295                 ADJUST_ARGS();
2296         }
2297         return 0;
2298 }
2299
2300 static __be32
2301 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2302 {
2303         int maxcount;
2304         char *page;
2305         ENCODE_HEAD;
2306
2307         if (nfserr)
2308                 return nfserr;
2309         if (resp->xbuf->page_len)
2310                 return nfserr_resource;
2311
2312         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2313
2314         maxcount = PAGE_SIZE;
2315         RESERVE_SPACE(4);
2316
2317         /*
2318          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2319          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2320          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2321          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2322          */
2323         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2324         if (nfserr == nfserr_isdir)
2325                 return nfserr_inval;
2326         if (nfserr)
2327                 return nfserr;
2328
2329         WRITE32(maxcount);
2330         ADJUST_ARGS();
2331         resp->xbuf->head[0].iov_len = (char*)p
2332                                 - (char*)resp->xbuf->head[0].iov_base;
2333         resp->xbuf->page_len = maxcount;
2334
2335         /* Use rest of head for padding and remaining ops: */
2336         resp->xbuf->tail[0].iov_base = p;
2337         resp->xbuf->tail[0].iov_len = 0;
2338         if (maxcount&3) {
2339                 RESERVE_SPACE(4);
2340                 WRITE32(0);
2341                 resp->xbuf->tail[0].iov_base += maxcount&3;
2342                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2343                 ADJUST_ARGS();
2344         }
2345         return 0;
2346 }
2347
2348 static __be32
2349 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2350 {
2351         int maxcount;
2352         loff_t offset;
2353         __be32 *page, *savep, *tailbase;
2354         ENCODE_HEAD;
2355
2356         if (nfserr)
2357                 return nfserr;
2358         if (resp->xbuf->page_len)
2359                 return nfserr_resource;
2360
2361         RESERVE_SPACE(8);  /* verifier */
2362         savep = p;
2363
2364         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2365         WRITE32(0);
2366         WRITE32(0);
2367         ADJUST_ARGS();
2368         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2369         tailbase = p;
2370
2371         maxcount = PAGE_SIZE;
2372         if (maxcount > readdir->rd_maxcount)
2373                 maxcount = readdir->rd_maxcount;
2374
2375         /*
2376          * Convert from bytes to words, account for the two words already
2377          * written, make sure to leave two words at the end for the next
2378          * pointer and eof field.
2379          */
2380         maxcount = (maxcount >> 2) - 4;
2381         if (maxcount < 0) {
2382                 nfserr =  nfserr_toosmall;
2383                 goto err_no_verf;
2384         }
2385
2386         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2387         readdir->common.err = 0;
2388         readdir->buflen = maxcount;
2389         readdir->buffer = page;
2390         readdir->offset = NULL;
2391
2392         offset = readdir->rd_cookie;
2393         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2394                               &offset,
2395                               &readdir->common, nfsd4_encode_dirent);
2396         if (nfserr == nfs_ok &&
2397             readdir->common.err == nfserr_toosmall &&
2398             readdir->buffer == page)
2399                 nfserr = nfserr_toosmall;
2400         if (nfserr == nfserr_symlink)
2401                 nfserr = nfserr_notdir;
2402         if (nfserr)
2403                 goto err_no_verf;
2404
2405         if (readdir->offset)
2406                 xdr_encode_hyper(readdir->offset, offset);
2407
2408         p = readdir->buffer;
2409         *p++ = 0;       /* no more entries */
2410         *p++ = htonl(readdir->common.err == nfserr_eof);
2411         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2412                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2413
2414         /* Use rest of head for padding and remaining ops: */
2415         resp->xbuf->tail[0].iov_base = tailbase;
2416         resp->xbuf->tail[0].iov_len = 0;
2417         resp->p = resp->xbuf->tail[0].iov_base;
2418         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2419
2420         return 0;
2421 err_no_verf:
2422         p = savep;
2423         ADJUST_ARGS();
2424         return nfserr;
2425 }
2426
2427 static void
2428 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2429 {
2430         ENCODE_HEAD;
2431
2432         if (!nfserr) {
2433                 RESERVE_SPACE(20);
2434                 WRITECINFO(remove->rm_cinfo);
2435                 ADJUST_ARGS();
2436         }
2437 }
2438
2439 static void
2440 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2441 {
2442         ENCODE_HEAD;
2443
2444         if (!nfserr) {
2445                 RESERVE_SPACE(40);
2446                 WRITECINFO(rename->rn_sinfo);
2447                 WRITECINFO(rename->rn_tinfo);
2448                 ADJUST_ARGS();
2449         }
2450 }
2451
2452 static void
2453 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, int nfserr,
2454                      struct nfsd4_secinfo *secinfo)
2455 {
2456         int i = 0;
2457         struct svc_export *exp = secinfo->si_exp;
2458         u32 nflavs;
2459         struct exp_flavor_info *flavs;
2460         struct exp_flavor_info def_flavs[2];
2461         ENCODE_HEAD;
2462
2463         if (nfserr)
2464                 goto out;
2465         if (exp->ex_nflavors) {
2466                 flavs = exp->ex_flavors;
2467                 nflavs = exp->ex_nflavors;
2468         } else { /* Handling of some defaults in absence of real secinfo: */
2469                 flavs = def_flavs;
2470                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2471                         nflavs = 2;
2472                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2473                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2474                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2475                         nflavs = 1;
2476                         flavs[0].pseudoflavor
2477                                         = svcauth_gss_flavor(exp->ex_client);
2478                 } else {
2479                         nflavs = 1;
2480                         flavs[0].pseudoflavor
2481                                         = exp->ex_client->flavour->flavour;
2482                 }
2483         }
2484
2485         RESERVE_SPACE(4);
2486         WRITE32(nflavs);
2487         ADJUST_ARGS();
2488         for (i = 0; i < nflavs; i++) {
2489                 u32 flav = flavs[i].pseudoflavor;
2490                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2491
2492                 if (gm) {
2493                         RESERVE_SPACE(4);
2494                         WRITE32(RPC_AUTH_GSS);
2495                         ADJUST_ARGS();
2496                         RESERVE_SPACE(4 + gm->gm_oid.len);
2497                         WRITE32(gm->gm_oid.len);
2498                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2499                         ADJUST_ARGS();
2500                         RESERVE_SPACE(4);
2501                         WRITE32(0); /* qop */
2502                         ADJUST_ARGS();
2503                         RESERVE_SPACE(4);
2504                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2505                         ADJUST_ARGS();
2506                         gss_mech_put(gm);
2507                 } else {
2508                         RESERVE_SPACE(4);
2509                         WRITE32(flav);
2510                         ADJUST_ARGS();
2511                 }
2512         }
2513 out:
2514         if (exp)
2515                 exp_put(exp);
2516 }
2517
2518 /*
2519  * The SETATTR encode routine is special -- it always encodes a bitmap,
2520  * regardless of the error status.
2521  */
2522 static void
2523 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2524 {
2525         ENCODE_HEAD;
2526
2527         RESERVE_SPACE(12);
2528         if (nfserr) {
2529                 WRITE32(2);
2530                 WRITE32(0);
2531                 WRITE32(0);
2532         }
2533         else {
2534                 WRITE32(2);
2535                 WRITE32(setattr->sa_bmval[0]);
2536                 WRITE32(setattr->sa_bmval[1]);
2537         }
2538         ADJUST_ARGS();
2539 }
2540
2541 static void
2542 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2543 {
2544         ENCODE_HEAD;
2545
2546         if (!nfserr) {
2547                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2548                 WRITEMEM(&scd->se_clientid, 8);
2549                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2550                 ADJUST_ARGS();
2551         }
2552         else if (nfserr == nfserr_clid_inuse) {
2553                 RESERVE_SPACE(8);
2554                 WRITE32(0);
2555                 WRITE32(0);
2556                 ADJUST_ARGS();
2557         }
2558 }
2559
2560 static void
2561 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2562 {
2563         ENCODE_HEAD;
2564
2565         if (!nfserr) {
2566                 RESERVE_SPACE(16);
2567                 WRITE32(write->wr_bytes_written);
2568                 WRITE32(write->wr_how_written);
2569                 WRITEMEM(write->wr_verifier.data, 8);
2570                 ADJUST_ARGS();
2571         }
2572 }
2573
2574 void
2575 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2576 {
2577         __be32 *statp;
2578         ENCODE_HEAD;
2579
2580         RESERVE_SPACE(8);
2581         WRITE32(op->opnum);
2582         statp = p++;    /* to be backfilled at the end */
2583         ADJUST_ARGS();
2584
2585         switch (op->opnum) {
2586         case OP_ACCESS:
2587                 nfsd4_encode_access(resp, op->status, &op->u.access);
2588                 break;
2589         case OP_CLOSE:
2590                 nfsd4_encode_close(resp, op->status, &op->u.close);
2591                 break;
2592         case OP_COMMIT:
2593                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2594                 break;
2595         case OP_CREATE:
2596                 nfsd4_encode_create(resp, op->status, &op->u.create);
2597                 break;
2598         case OP_DELEGRETURN:
2599                 break;
2600         case OP_GETATTR:
2601                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2602                 break;
2603         case OP_GETFH:
2604                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2605                 break;
2606         case OP_LINK:
2607                 nfsd4_encode_link(resp, op->status, &op->u.link);
2608                 break;
2609         case OP_LOCK:
2610                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2611                 break;
2612         case OP_LOCKT:
2613                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2614                 break;
2615         case OP_LOCKU:
2616                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2617                 break;
2618         case OP_LOOKUP:
2619                 break;
2620         case OP_LOOKUPP:
2621                 break;
2622         case OP_NVERIFY:
2623                 break;
2624         case OP_OPEN:
2625                 nfsd4_encode_open(resp, op->status, &op->u.open);
2626                 break;
2627         case OP_OPEN_CONFIRM:
2628                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2629                 break;
2630         case OP_OPEN_DOWNGRADE:
2631                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2632                 break;
2633         case OP_PUTFH:
2634                 break;
2635         case OP_PUTROOTFH:
2636                 break;
2637         case OP_READ:
2638                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2639                 break;
2640         case OP_READDIR:
2641                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2642                 break;
2643         case OP_READLINK:
2644                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2645                 break;
2646         case OP_REMOVE:
2647                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2648                 break;
2649         case OP_RENAME:
2650                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2651                 break;
2652         case OP_RENEW:
2653                 break;
2654         case OP_RESTOREFH:
2655                 break;
2656         case OP_SAVEFH:
2657                 break;
2658         case OP_SECINFO:
2659                 nfsd4_encode_secinfo(resp, op->status, &op->u.secinfo);
2660                 break;
2661         case OP_SETATTR:
2662                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2663                 break;
2664         case OP_SETCLIENTID:
2665                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2666                 break;
2667         case OP_SETCLIENTID_CONFIRM:
2668                 break;
2669         case OP_VERIFY:
2670                 break;
2671         case OP_WRITE:
2672                 nfsd4_encode_write(resp, op->status, &op->u.write);
2673                 break;
2674         case OP_RELEASE_LOCKOWNER:
2675                 break;
2676         default:
2677                 break;
2678         }
2679
2680         /*
2681          * Note: We write the status directly, instead of using WRITE32(),
2682          * since it is already in network byte order.
2683          */
2684         *statp = op->status;
2685 }
2686
2687 /*
2688  * Encode the reply stored in the stateowner reply cache
2689  *
2690  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2691  * previously sent already encoded operation.
2692  *
2693  * called with nfs4_lock_state() held
2694  */
2695 void
2696 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2697 {
2698         ENCODE_HEAD;
2699         struct nfs4_replay *rp = op->replay;
2700
2701         BUG_ON(!rp);
2702
2703         RESERVE_SPACE(8);
2704         WRITE32(op->opnum);
2705         *p++ = rp->rp_status;  /* already xdr'ed */
2706         ADJUST_ARGS();
2707
2708         RESERVE_SPACE(rp->rp_buflen);
2709         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2710         ADJUST_ARGS();
2711 }
2712
2713 /*
2714  * END OF "GENERIC" ENCODE ROUTINES.
2715  */
2716
2717 int
2718 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2719 {
2720         return xdr_ressize_check(rqstp, p);
2721 }
2722
2723 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2724 {
2725         if (args->ops != args->iops) {
2726                 kfree(args->ops);
2727                 args->ops = args->iops;
2728         }
2729         kfree(args->tmpp);
2730         args->tmpp = NULL;
2731         while (args->to_free) {
2732                 struct tmpbuf *tb = args->to_free;
2733                 args->to_free = tb->next;
2734                 tb->release(tb->buf);
2735                 kfree(tb);
2736         }
2737 }
2738
2739 int
2740 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2741 {
2742         __be32 status;
2743
2744         args->p = p;
2745         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2746         args->pagelist = rqstp->rq_arg.pages;
2747         args->pagelen = rqstp->rq_arg.page_len;
2748         args->tmpp = NULL;
2749         args->to_free = NULL;
2750         args->ops = args->iops;
2751         args->rqstp = rqstp;
2752
2753         status = nfsd4_decode_compound(args);
2754         if (status) {
2755                 nfsd4_release_compoundargs(args);
2756         }
2757         return !status;
2758 }
2759
2760 int
2761 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2762 {
2763         /*
2764          * All that remains is to write the tag and operation count...
2765          */
2766         struct kvec *iov;
2767         p = resp->tagp;
2768         *p++ = htonl(resp->taglen);
2769         memcpy(p, resp->tag, resp->taglen);
2770         p += XDR_QUADLEN(resp->taglen);
2771         *p++ = htonl(resp->opcnt);
2772
2773         if (rqstp->rq_res.page_len)
2774                 iov = &rqstp->rq_res.tail[0];
2775         else
2776                 iov = &rqstp->rq_res.head[0];
2777         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2778         BUG_ON(iov->iov_len > PAGE_SIZE);
2779         return 1;
2780 }
2781
2782 /*
2783  * Local variables:
2784  *  c-basic-offset: 8
2785  * End:
2786  */