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   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * TODO: Neil Brown made the following observation:  We currently
  36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37  * never release any of that until the request is complete.
  38  * It would be good to calculate a new maximum response size while
  39  * decoding the COMPOUND, and call svc_reserve with this number
  40  * at the end of nfs4svc_decode_compoundargs.
  41  */
  42
  43 #include <linux/param.h>
  44 #include <linux/smp.h>
  45 #include <linux/fs.h>
  46 #include <linux/namei.h>
  47 #include <linux/vfs.h>
  48 #include <linux/sunrpc/xdr.h>
  49 #include <linux/sunrpc/svc.h>
  50 #include <linux/sunrpc/clnt.h>
  51 #include <linux/nfsd/nfsd.h>
  52 #include <linux/nfsd/state.h>
  53 #include <linux/nfsd/xdr4.h>
  54 #include <linux/nfsd_idmap.h>
  55 #include <linux/nfs4.h>
  56 #include <linux/nfs4_acl.h>
  57 #include <linux/sunrpc/gss_api.h>
  58 #include <linux/sunrpc/svcauth_gss.h>
  59
  60 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  61
  62 /*
  63  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  64  * directory in order to indicate to the client that a filesystem boundary is present
  65  * We use a fixed fsid for a referral
  66  */
  67 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  68 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  69
  70 static __be32
  71 check_filename(char *str, int len, __be32 err)
  72 {
  73         int i;
  74
  75         if (len == 0)
  76                 return nfserr_inval;
  77         if (isdotent(str, len))
  78                 return err;
  79         for (i = 0; i < len; i++)
  80                 if (str[i] == '/')
  81                         return err;
  82         return 0;
  83 }
  84
  85 /*
  86  * START OF "GENERIC" DECODE ROUTINES.
  87  *   These may look a little ugly since they are imported from a "generic"
  88  * set of XDR encode/decode routines which are intended to be shared by
  89  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  90  *
  91  * If the pain of reading these is too great, it should be a straightforward
  92  * task to translate them into Linux-specific versions which are more
  93  * consistent with the style used in NFSv2/v3...
  94  */
  95 #define DECODE_HEAD                             \
  96         __be32 *p;                              \
  97         __be32 status
  98 #define DECODE_TAIL                             \
  99         status = 0;                             \
 100 out:                                            \
 101         return status;                          \
 102 xdr_error:                                      \
 103         dprintk("NFSD: xdr error (%s:%d)\n",    \
 104                         __FILE__, __LINE__);    \
 105         status = nfserr_bad_xdr;                \
 106         goto out
 107
 108 #define READ32(x)         (x) = ntohl(*p++)
 109 #define READ64(x)         do {                  \
 110         (x) = (u64)ntohl(*p++) << 32;           \
 111         (x) |= ntohl(*p++);                     \
 112 } while (0)
 113 #define READTIME(x)       do {                  \
 114         p++;                                    \
 115         (x) = ntohl(*p++);                      \
 116         p++;                                    \
 117 } while (0)
 118 #define READMEM(x,nbytes) do {                  \
 119         x = (char *)p;                          \
 120         p += XDR_QUADLEN(nbytes);               \
 121 } while (0)
 122 #define SAVEMEM(x,nbytes) do {                  \
 123         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 124                 savemem(argp, p, nbytes) :      \
 125                 (char *)p)) {                   \
 126                 dprintk("NFSD: xdr error (%s:%d)\n", \
 127                                 __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                 dprintk("NFSD: xdr error (%s:%d)\n", \
 144                                 __FILE__, __LINE__); \
 145                 goto xdr_error;                 \
 146         }                                       \
 147 } while (0)
 148
 149 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 150 {
 151         /* We want more bytes than seem to be available.
 152          * Maybe we need a new page, maybe we have just run out
 153          */
 154         unsigned int avail = (char *)argp->end - (char *)argp->p;
 155         __be32 *p;
 156         if (avail + argp->pagelen < nbytes)
 157                 return NULL;
 158         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 159                 return NULL;
 160         /* ok, we can do it with the current plus the next page */
 161         if (nbytes <= sizeof(argp->tmp))
 162                 p = argp->tmp;
 163         else {
 164                 kfree(argp->tmpp);
 165                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 166                 if (!p)
 167                         return NULL;
 168
 169         }
 170         /*
 171          * The following memcpy is safe because read_buf is always
 172          * called with nbytes > avail, and the two cases above both
 173          * guarantee p points to at least nbytes bytes.
 174          */
 175         memcpy(p, argp->p, avail);
 176         /* step to next page */
 177         argp->p = page_address(argp->pagelist[0]);
 178         argp->pagelist++;
 179         if (argp->pagelen < PAGE_SIZE) {
 180                 argp->end = p + (argp->pagelen>>2);
 181                 argp->pagelen = 0;
 182         } else {
 183                 argp->end = p + (PAGE_SIZE>>2);
 184                 argp->pagelen -= PAGE_SIZE;
 185         }
 186         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 187         argp->p += XDR_QUADLEN(nbytes - avail);
 188         return p;
 189 }
 190
 191 static int
 192 defer_free(struct nfsd4_compoundargs *argp,
 193                 void (*release)(const void *), void *p)
 194 {
 195         struct tmpbuf *tb;
 196
 197         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 198         if (!tb)
 199                 return -ENOMEM;
 200         tb->buf = p;
 201         tb->release = release;
 202         tb->next = argp->to_free;
 203         argp->to_free = tb;
 204         return 0;
 205 }
 206
 207 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 208 {
 209         if (p == argp->tmp) {
 210                 p = kmalloc(nbytes, GFP_KERNEL);
 211                 if (!p)
 212                         return NULL;
 213                 memcpy(p, argp->tmp, nbytes);
 214         } else {
 215                 BUG_ON(p != argp->tmpp);
 216                 argp->tmpp = NULL;
 217         }
 218         if (defer_free(argp, kfree, p)) {
 219                 kfree(p);
 220                 return NULL;
 221         } else
 222                 return (char *)p;
 223 }
 224
 225 static __be32
 226 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 227 {
 228         u32 bmlen;
 229         DECODE_HEAD;
 230
 231         bmval[0] = 0;
 232         bmval[1] = 0;
 233
 234         READ_BUF(4);
 235         READ32(bmlen);
 236         if (bmlen > 1000)
 237                 goto xdr_error;
 238
 239         READ_BUF(bmlen << 2);
 240         if (bmlen > 0)
 241                 READ32(bmval[0]);
 242         if (bmlen > 1)
 243                 READ32(bmval[1]);
 244
 245         DECODE_TAIL;
 246 }
 247
 248 static __be32
 249 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 250     struct nfs4_acl **acl)
 251 {
 252         int expected_len, len = 0;
 253         u32 dummy32;
 254         char *buf;
 255         int host_err;
 256
 257         DECODE_HEAD;
 258         iattr->ia_valid = 0;
 259         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 260                 return status;
 261
 262         /*
 263          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
 264          * read-only attributes return ERR_INVAL.
 265          */
 266         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 267                 return nfserr_attrnotsupp;
 268         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 269                 return nfserr_inval;
 270
 271         READ_BUF(4);
 272         READ32(expected_len);
 273
 274         if (bmval[0] & FATTR4_WORD0_SIZE) {
 275                 READ_BUF(8);
 276                 len += 8;
 277                 READ64(iattr->ia_size);
 278                 iattr->ia_valid |= ATTR_SIZE;
 279         }
 280         if (bmval[0] & FATTR4_WORD0_ACL) {
 281                 int nace;
 282                 struct nfs4_ace *ace;
 283
 284                 READ_BUF(4); len += 4;
 285                 READ32(nace);
 286
 287                 if (nace > NFS4_ACL_MAX)
 288                         return nfserr_resource;
 289
 290                 *acl = nfs4_acl_new(nace);
 291                 if (*acl == NULL) {
 292                         host_err = -ENOMEM;
 293                         goto out_nfserr;
 294                 }
 295                 defer_free(argp, kfree, *acl);
 296
 297                 (*acl)->naces = nace;
 298                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 299                         READ_BUF(16); len += 16;
 300                         READ32(ace->type);
 301                         READ32(ace->flag);
 302                         READ32(ace->access_mask);
 303                         READ32(dummy32);
 304                         READ_BUF(dummy32);
 305                         len += XDR_QUADLEN(dummy32) << 2;
 306                         READMEM(buf, dummy32);
 307                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 308                         host_err = 0;
 309                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 310                                 ace->who = 0;
 311                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 312                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 313                                                 buf, dummy32, &ace->who);
 314                         else
 315                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 316                                                 buf, dummy32, &ace->who);
 317                         if (host_err)
 318                                 goto out_nfserr;
 319                 }
 320         } else
 321                 *acl = NULL;
 322         if (bmval[1] & FATTR4_WORD1_MODE) {
 323                 READ_BUF(4);
 324                 len += 4;
 325                 READ32(iattr->ia_mode);
 326                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 327                 iattr->ia_valid |= ATTR_MODE;
 328         }
 329         if (bmval[1] & FATTR4_WORD1_OWNER) {
 330                 READ_BUF(4);
 331                 len += 4;
 332                 READ32(dummy32);
 333                 READ_BUF(dummy32);
 334                 len += (XDR_QUADLEN(dummy32) << 2);
 335                 READMEM(buf, dummy32);
 336                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 337                         goto out_nfserr;
 338                 iattr->ia_valid |= ATTR_UID;
 339         }
 340         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 341                 READ_BUF(4);
 342                 len += 4;
 343                 READ32(dummy32);
 344                 READ_BUF(dummy32);
 345                 len += (XDR_QUADLEN(dummy32) << 2);
 346                 READMEM(buf, dummy32);
 347                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 348                         goto out_nfserr;
 349                 iattr->ia_valid |= ATTR_GID;
 350         }
 351         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 352                 READ_BUF(4);
 353                 len += 4;
 354                 READ32(dummy32);
 355                 switch (dummy32) {
 356                 case NFS4_SET_TO_CLIENT_TIME:
 357                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 358                            all 32 bits of 'nseconds'. */
 359                         READ_BUF(12);
 360                         len += 12;
 361                         READ32(dummy32);
 362                         if (dummy32)
 363                                 return nfserr_inval;
 364                         READ32(iattr->ia_atime.tv_sec);
 365                         READ32(iattr->ia_atime.tv_nsec);
 366                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 367                                 return nfserr_inval;
 368                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 369                         break;
 370                 case NFS4_SET_TO_SERVER_TIME:
 371                         iattr->ia_valid |= ATTR_ATIME;
 372                         break;
 373                 default:
 374                         goto xdr_error;
 375                 }
 376         }
 377         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 378                 READ_BUF(4);
 379                 len += 4;
 380                 READ32(dummy32);
 381                 switch (dummy32) {
 382                 case NFS4_SET_TO_CLIENT_TIME:
 383                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 384                            all 32 bits of 'nseconds'. */
 385                         READ_BUF(12);
 386                         len += 12;
 387                         READ32(dummy32);
 388                         if (dummy32)
 389                                 return nfserr_inval;
 390                         READ32(iattr->ia_mtime.tv_sec);
 391                         READ32(iattr->ia_mtime.tv_nsec);
 392                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 393                                 return nfserr_inval;
 394                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 395                         break;
 396                 case NFS4_SET_TO_SERVER_TIME:
 397                         iattr->ia_valid |= ATTR_MTIME;
 398                         break;
 399                 default:
 400                         goto xdr_error;
 401                 }
 402         }
 403         if (len != expected_len)
 404                 goto xdr_error;
 405
 406         DECODE_TAIL;
 407
 408 out_nfserr:
 409         status = nfserrno(host_err);
 410         goto out;
 411 }
 412
 413 static __be32
 414 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 415 {
 416         DECODE_HEAD;
 417
 418         READ_BUF(sizeof(stateid_t));
 419         READ32(sid->si_generation);
 420         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 421
 422         DECODE_TAIL;
 423 }
 424
 425 static __be32
 426 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 427 {
 428         DECODE_HEAD;
 429
 430         READ_BUF(4);
 431         READ32(access->ac_req_access);
 432
 433         DECODE_TAIL;
 434 }
 435
 436 static __be32
 437 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 438 {
 439         DECODE_HEAD;
 440
 441         close->cl_stateowner = NULL;
 442         READ_BUF(4);
 443         READ32(close->cl_seqid);
 444         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 445
 446         DECODE_TAIL;
 447 }
 448
 449
 450 static __be32
 451 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 452 {
 453         DECODE_HEAD;
 454
 455         READ_BUF(12);
 456         READ64(commit->co_offset);
 457         READ32(commit->co_count);
 458
 459         DECODE_TAIL;
 460 }
 461
 462 static __be32
 463 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 464 {
 465         DECODE_HEAD;
 466
 467         READ_BUF(4);
 468         READ32(create->cr_type);
 469         switch (create->cr_type) {
 470         case NF4LNK:
 471                 READ_BUF(4);
 472                 READ32(create->cr_linklen);
 473                 READ_BUF(create->cr_linklen);
 474                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 475                 break;
 476         case NF4BLK:
 477         case NF4CHR:
 478                 READ_BUF(8);
 479                 READ32(create->cr_specdata1);
 480                 READ32(create->cr_specdata2);
 481                 break;
 482         case NF4SOCK:
 483         case NF4FIFO:
 484         case NF4DIR:
 485         default:
 486                 break;
 487         }
 488
 489         READ_BUF(4);
 490         READ32(create->cr_namelen);
 491         READ_BUF(create->cr_namelen);
 492         SAVEMEM(create->cr_name, create->cr_namelen);
 493         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 494                 return status;
 495
 496         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 497                 goto out;
 498
 499         DECODE_TAIL;
 500 }
 501
 502 static inline __be32
 503 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 504 {
 505         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 506 }
 507
 508 static inline __be32
 509 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 510 {
 511         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 512 }
 513
 514 static __be32
 515 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 516 {
 517         DECODE_HEAD;
 518
 519         READ_BUF(4);
 520         READ32(link->li_namelen);
 521         READ_BUF(link->li_namelen);
 522         SAVEMEM(link->li_name, link->li_namelen);
 523         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 524                 return status;
 525
 526         DECODE_TAIL;
 527 }
 528
 529 static __be32
 530 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 531 {
 532         DECODE_HEAD;
 533
 534         lock->lk_replay_owner = NULL;
 535         /*
 536         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 537         */
 538         READ_BUF(28);
 539         READ32(lock->lk_type);
 540         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 541                 goto xdr_error;
 542         READ32(lock->lk_reclaim);
 543         READ64(lock->lk_offset);
 544         READ64(lock->lk_length);
 545         READ32(lock->lk_is_new);
 546
 547         if (lock->lk_is_new) {
 548                 READ_BUF(4);
 549                 READ32(lock->lk_new_open_seqid);
 550                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 551                 if (status)
 552                         return status;
 553                 READ_BUF(8 + sizeof(clientid_t));
 554                 READ32(lock->lk_new_lock_seqid);
 555                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 556                 READ32(lock->lk_new_owner.len);
 557                 READ_BUF(lock->lk_new_owner.len);
 558                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 559         } else {
 560                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 561                 if (status)
 562                         return status;
 563                 READ_BUF(4);
 564                 READ32(lock->lk_old_lock_seqid);
 565         }
 566
 567         DECODE_TAIL;
 568 }
 569
 570 static __be32
 571 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 572 {
 573         DECODE_HEAD;
 574
 575         READ_BUF(32);
 576         READ32(lockt->lt_type);
 577         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 578                 goto xdr_error;
 579         READ64(lockt->lt_offset);
 580         READ64(lockt->lt_length);
 581         COPYMEM(&lockt->lt_clientid, 8);
 582         READ32(lockt->lt_owner.len);
 583         READ_BUF(lockt->lt_owner.len);
 584         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 585
 586         DECODE_TAIL;
 587 }
 588
 589 static __be32
 590 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 591 {
 592         DECODE_HEAD;
 593
 594         locku->lu_stateowner = NULL;
 595         READ_BUF(8);
 596         READ32(locku->lu_type);
 597         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 598                 goto xdr_error;
 599         READ32(locku->lu_seqid);
 600         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 601         if (status)
 602                 return status;
 603         READ_BUF(16);
 604         READ64(locku->lu_offset);
 605         READ64(locku->lu_length);
 606
 607         DECODE_TAIL;
 608 }
 609
 610 static __be32
 611 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 612 {
 613         DECODE_HEAD;
 614
 615         READ_BUF(4);
 616         READ32(lookup->lo_len);
 617         READ_BUF(lookup->lo_len);
 618         SAVEMEM(lookup->lo_name, lookup->lo_len);
 619         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 620                 return status;
 621
 622         DECODE_TAIL;
 623 }
 624
 625 static __be32
 626 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 627 {
 628         DECODE_HEAD;
 629
 630         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 631         open->op_iattr.ia_valid = 0;
 632         open->op_stateowner = NULL;
 633
 634         /* seqid, share_access, share_deny, clientid, ownerlen */
 635         READ_BUF(16 + sizeof(clientid_t));
 636         READ32(open->op_seqid);
 637         READ32(open->op_share_access);
 638         READ32(open->op_share_deny);
 639         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 640         READ32(open->op_owner.len);
 641
 642         /* owner, open_flag */
 643         READ_BUF(open->op_owner.len + 4);
 644         SAVEMEM(open->op_owner.data, open->op_owner.len);
 645         READ32(open->op_create);
 646         switch (open->op_create) {
 647         case NFS4_OPEN_NOCREATE:
 648                 break;
 649         case NFS4_OPEN_CREATE:
 650                 READ_BUF(4);
 651                 READ32(open->op_createmode);
 652                 switch (open->op_createmode) {
 653                 case NFS4_CREATE_UNCHECKED:
 654                 case NFS4_CREATE_GUARDED:
 655                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 656                                 goto out;
 657                         break;
 658                 case NFS4_CREATE_EXCLUSIVE:
 659                         READ_BUF(8);
 660                         COPYMEM(open->op_verf.data, 8);
 661                         break;
 662                 default:
 663                         goto xdr_error;
 664                 }
 665                 break;
 666         default:
 667                 goto xdr_error;
 668         }
 669
 670         /* open_claim */
 671         READ_BUF(4);
 672         READ32(open->op_claim_type);
 673         switch (open->op_claim_type) {
 674         case NFS4_OPEN_CLAIM_NULL:
 675         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 676                 READ_BUF(4);
 677                 READ32(open->op_fname.len);
 678                 READ_BUF(open->op_fname.len);
 679                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 680                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 681                         return status;
 682                 break;
 683         case NFS4_OPEN_CLAIM_PREVIOUS:
 684                 READ_BUF(4);
 685                 READ32(open->op_delegate_type);
 686                 break;
 687         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 688                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 689                 if (status)
 690                         return status;
 691                 READ_BUF(4);
 692                 READ32(open->op_fname.len);
 693                 READ_BUF(open->op_fname.len);
 694                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 695                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 696                         return status;
 697                 break;
 698         default:
 699                 goto xdr_error;
 700         }
 701
 702         DECODE_TAIL;
 703 }
 704
 705 static __be32
 706 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 707 {
 708         DECODE_HEAD;
 709
 710         open_conf->oc_stateowner = NULL;
 711         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 712         if (status)
 713                 return status;
 714         READ_BUF(4);
 715         READ32(open_conf->oc_seqid);
 716
 717         DECODE_TAIL;
 718 }
 719
 720 static __be32
 721 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 722 {
 723         DECODE_HEAD;
 724
 725         open_down->od_stateowner = NULL;
 726         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 727         if (status)
 728                 return status;
 729         READ_BUF(12);
 730         READ32(open_down->od_seqid);
 731         READ32(open_down->od_share_access);
 732         READ32(open_down->od_share_deny);
 733
 734         DECODE_TAIL;
 735 }
 736
 737 static __be32
 738 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 739 {
 740         DECODE_HEAD;
 741
 742         READ_BUF(4);
 743         READ32(putfh->pf_fhlen);
 744         if (putfh->pf_fhlen > NFS4_FHSIZE)
 745                 goto xdr_error;
 746         READ_BUF(putfh->pf_fhlen);
 747         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 748
 749         DECODE_TAIL;
 750 }
 751
 752 static __be32
 753 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 754 {
 755         DECODE_HEAD;
 756
 757         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 758         if (status)
 759                 return status;
 760         READ_BUF(12);
 761         READ64(read->rd_offset);
 762         READ32(read->rd_length);
 763
 764         DECODE_TAIL;
 765 }
 766
 767 static __be32
 768 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 769 {
 770         DECODE_HEAD;
 771
 772         READ_BUF(24);
 773         READ64(readdir->rd_cookie);
 774         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 775         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 776         READ32(readdir->rd_maxcount);
 777         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 778                 goto out;
 779
 780         DECODE_TAIL;
 781 }
 782
 783 static __be32
 784 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 785 {
 786         DECODE_HEAD;
 787
 788         READ_BUF(4);
 789         READ32(remove->rm_namelen);
 790         READ_BUF(remove->rm_namelen);
 791         SAVEMEM(remove->rm_name, remove->rm_namelen);
 792         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 793                 return status;
 794
 795         DECODE_TAIL;
 796 }
 797
 798 static __be32
 799 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 800 {
 801         DECODE_HEAD;
 802
 803         READ_BUF(4);
 804         READ32(rename->rn_snamelen);
 805         READ_BUF(rename->rn_snamelen + 4);
 806         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 807         READ32(rename->rn_tnamelen);
 808         READ_BUF(rename->rn_tnamelen);
 809         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 810         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 811                 return status;
 812         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 813                 return status;
 814
 815         DECODE_TAIL;
 816 }
 817
 818 static __be32
 819 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 820 {
 821         DECODE_HEAD;
 822
 823         READ_BUF(sizeof(clientid_t));
 824         COPYMEM(clientid, sizeof(clientid_t));
 825
 826         DECODE_TAIL;
 827 }
 828
 829 static __be32
 830 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 831                      struct nfsd4_secinfo *secinfo)
 832 {
 833         DECODE_HEAD;
 834
 835         READ_BUF(4);
 836         READ32(secinfo->si_namelen);
 837         READ_BUF(secinfo->si_namelen);
 838         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 839         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 840                                                                 nfserr_noent);
 841         if (status)
 842                 return status;
 843         DECODE_TAIL;
 844 }
 845
 846 static __be32
 847 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 848 {
 849         __be32 status;
 850
 851         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 852         if (status)
 853                 return status;
 854         return nfsd4_decode_fattr(argp, setattr->sa_bmval,
 855                                   &setattr->sa_iattr, &setattr->sa_acl);
 856 }
 857
 858 static __be32
 859 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 860 {
 861         DECODE_HEAD;
 862
 863         READ_BUF(12);
 864         COPYMEM(setclientid->se_verf.data, 8);
 865         READ32(setclientid->se_namelen);
 866
 867         READ_BUF(setclientid->se_namelen + 8);
 868         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 869         READ32(setclientid->se_callback_prog);
 870         READ32(setclientid->se_callback_netid_len);
 871
 872         READ_BUF(setclientid->se_callback_netid_len + 4);
 873         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 874         READ32(setclientid->se_callback_addr_len);
 875
 876         READ_BUF(setclientid->se_callback_addr_len + 4);
 877         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 878         READ32(setclientid->se_callback_ident);
 879
 880         DECODE_TAIL;
 881 }
 882
 883 static __be32
 884 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 885 {
 886         DECODE_HEAD;
 887
 888         READ_BUF(8 + sizeof(nfs4_verifier));
 889         COPYMEM(&scd_c->sc_clientid, 8);
 890         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 891
 892         DECODE_TAIL;
 893 }
 894
 895 /* Also used for NVERIFY */
 896 static __be32
 897 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 898 {
 899 #if 0
 900         struct nfsd4_compoundargs save = {
 901                 .p = argp->p,
 902                 .end = argp->end,
 903                 .rqstp = argp->rqstp,
 904         };
 905         u32             ve_bmval[2];
 906         struct iattr    ve_iattr;           /* request */
 907         struct nfs4_acl *ve_acl;            /* request */
 908 #endif
 909         DECODE_HEAD;
 910
 911         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 912                 goto out;
 913
 914         /* For convenience's sake, we compare raw xdr'd attributes in
 915          * nfsd4_proc_verify; however we still decode here just to return
 916          * correct error in case of bad xdr. */
 917 #if 0
 918         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 919         if (status == nfserr_inval) {
 920                 status = nfserrno(status);
 921                 goto out;
 922         }
 923 #endif
 924         READ_BUF(4);
 925         READ32(verify->ve_attrlen);
 926         READ_BUF(verify->ve_attrlen);
 927         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 928
 929         DECODE_TAIL;
 930 }
 931
 932 static __be32
 933 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 934 {
 935         int avail;
 936         int v;
 937         int len;
 938         DECODE_HEAD;
 939
 940         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
 941         if (status)
 942                 return status;
 943         READ_BUF(16);
 944         READ64(write->wr_offset);
 945         READ32(write->wr_stable_how);
 946         if (write->wr_stable_how > 2)
 947                 goto xdr_error;
 948         READ32(write->wr_buflen);
 949
 950         /* Sorry .. no magic macros for this.. *
 951          * READ_BUF(write->wr_buflen);
 952          * SAVEMEM(write->wr_buf, write->wr_buflen);
 953          */
 954         avail = (char*)argp->end - (char*)argp->p;
 955         if (avail + argp->pagelen < write->wr_buflen) {
 956                 dprintk("NFSD: xdr error (%s:%d)\n",
 957                                 __FILE__, __LINE__);
 958                 goto xdr_error;
 959         }
 960         argp->rqstp->rq_vec[0].iov_base = p;
 961         argp->rqstp->rq_vec[0].iov_len = avail;
 962         v = 0;
 963         len = write->wr_buflen;
 964         while (len > argp->rqstp->rq_vec[v].iov_len) {
 965                 len -= argp->rqstp->rq_vec[v].iov_len;
 966                 v++;
 967                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 968                 argp->pagelist++;
 969                 if (argp->pagelen >= PAGE_SIZE) {
 970                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 971                         argp->pagelen -= PAGE_SIZE;
 972                 } else {
 973                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 974                         argp->pagelen -= len;
 975                 }
 976         }
 977         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 978         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 979         argp->rqstp->rq_vec[v].iov_len = len;
 980         write->wr_vlen = v+1;
 981
 982         DECODE_TAIL;
 983 }
 984
 985 static __be32
 986 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 987 {
 988         DECODE_HEAD;
 989
 990         READ_BUF(12);
 991         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 992         READ32(rlockowner->rl_owner.len);
 993         READ_BUF(rlockowner->rl_owner.len);
 994         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 995
 996         DECODE_TAIL;
 997 }
 998
 999 static __be32
1000 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1001 {
1002         return nfs_ok;
1003 }
1004
1005 static __be32
1006 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1007 {
1008         return nfserr_opnotsupp;
1009 }
1010
1011 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1012
1013 static nfsd4_dec nfsd4_dec_ops[] = {
1014         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1015         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1016         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1017         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1018         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1019         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1020         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1021         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1022         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1023         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1024         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1025         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1026         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1027         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1028         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1029         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1030         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1031         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1032         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1033         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1034         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1035         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1036         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1037         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1038         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1039         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1040         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1041         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1042         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1043         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1044         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1045         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1046         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1047         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1048         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1049         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1050         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1051 };
1052
1053 struct nfsd4_minorversion_ops {
1054         nfsd4_dec *decoders;
1055         int nops;
1056 };
1057
1058 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1059         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1060 };
1061
1062 static __be32
1063 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1064 {
1065         DECODE_HEAD;
1066         struct nfsd4_op *op;
1067         struct nfsd4_minorversion_ops *ops;
1068         int i;
1069
1070         /*
1071          * XXX: According to spec, we should check the tag
1072          * for UTF-8 compliance.  I'm postponing this for
1073          * now because it seems that some clients do use
1074          * binary tags.
1075          */
1076         READ_BUF(4);
1077         READ32(argp->taglen);
1078         READ_BUF(argp->taglen + 8);
1079         SAVEMEM(argp->tag, argp->taglen);
1080         READ32(argp->minorversion);
1081         READ32(argp->opcnt);
1082
1083         if (argp->taglen > NFSD4_MAX_TAGLEN)
1084                 goto xdr_error;
1085         if (argp->opcnt > 100)
1086                 goto xdr_error;
1087
1088         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1089                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1090                 if (!argp->ops) {
1091                         argp->ops = argp->iops;
1092                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1093                         goto xdr_error;
1094                 }
1095         }
1096
1097         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1098                 argp->opcnt = 0;
1099
1100         ops = &nfsd4_minorversion[argp->minorversion];
1101         for (i = 0; i < argp->opcnt; i++) {
1102                 op = &argp->ops[i];
1103                 op->replay = NULL;
1104
1105                 /*
1106                  * We can't use READ_BUF() here because we need to handle
1107                  * a missing opcode as an OP_WRITE + 1. So we need to check
1108                  * to see if we're truly at the end of our buffer or if there
1109                  * is another page we need to flip to.
1110                  */
1111
1112                 if (argp->p == argp->end) {
1113                         if (argp->pagelen < 4) {
1114                                 /* There isn't an opcode still on the wire */
1115                                 op->opnum = OP_WRITE + 1;
1116                                 op->status = nfserr_bad_xdr;
1117                                 argp->opcnt = i+1;
1118                                 break;
1119                         }
1120
1121                         /*
1122                          * False alarm. We just hit a page boundary, but there
1123                          * is still data available.  Move pointer across page
1124                          * boundary.  *snip from READ_BUF*
1125                          */
1126                         argp->p = page_address(argp->pagelist[0]);
1127                         argp->pagelist++;
1128                         if (argp->pagelen < PAGE_SIZE) {
1129                                 argp->end = p + (argp->pagelen>>2);
1130                                 argp->pagelen = 0;
1131                         } else {
1132                                 argp->end = p + (PAGE_SIZE>>2);
1133                                 argp->pagelen -= PAGE_SIZE;
1134                         }
1135                 }
1136                 op->opnum = ntohl(*argp->p++);
1137
1138                 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1139                         op->status = ops->decoders[op->opnum](argp, &op->u);
1140                 else {
1141                         op->opnum = OP_ILLEGAL;
1142                         op->status = nfserr_op_illegal;
1143                 }
1144
1145                 if (op->status) {
1146                         argp->opcnt = i+1;
1147                         break;
1148                 }
1149         }
1150
1151         DECODE_TAIL;
1152 }
1153 /*
1154  * END OF "GENERIC" DECODE ROUTINES.
1155  */
1156
1157 /*
1158  * START OF "GENERIC" ENCODE ROUTINES.
1159  *   These may look a little ugly since they are imported from a "generic"
1160  * set of XDR encode/decode routines which are intended to be shared by
1161  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1162  *
1163  * If the pain of reading these is too great, it should be a straightforward
1164  * task to translate them into Linux-specific versions which are more
1165  * consistent with the style used in NFSv2/v3...
1166  */
1167 #define ENCODE_HEAD              __be32 *p
1168
1169 #define WRITE32(n)               *p++ = htonl(n)
1170 #define WRITE64(n)               do {                           \
1171         *p++ = htonl((u32)((n) >> 32));                         \
1172         *p++ = htonl((u32)(n));                                 \
1173 } while (0)
1174 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1175         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1176         memcpy(p, ptr, nbytes);                                 \
1177         p += XDR_QUADLEN(nbytes);                               \
1178 }} while (0)
1179 #define WRITECINFO(c)           do {                            \
1180         *p++ = htonl(c.atomic);                                 \
1181         *p++ = htonl(c.before_ctime_sec);                               \
1182         *p++ = htonl(c.before_ctime_nsec);                              \
1183         *p++ = htonl(c.after_ctime_sec);                                \
1184         *p++ = htonl(c.after_ctime_nsec);                               \
1185 } while (0)
1186
1187 #define RESERVE_SPACE(nbytes)   do {                            \
1188         p = resp->p;                                            \
1189         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1190 } while (0)
1191 #define ADJUST_ARGS()           resp->p = p
1192
1193 /*
1194  * Header routine to setup seqid operation replay cache
1195  */
1196 #define ENCODE_SEQID_OP_HEAD                                    \
1197         __be32 *save;                                           \
1198                                                                 \
1199         save = resp->p;
1200
1201 /*
1202  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1203  * is where sequence id's are incremented, and the replay cache is filled.
1204  * Note that we increment sequence id's here, at the last moment, so we're sure
1205  * we know whether the error to be returned is a sequence id mutating error.
1206  */
1207
1208 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1209         if (seqid_mutating_err(nfserr) && stateowner) {         \
1210                 stateowner->so_seqid++;                         \
1211                 stateowner->so_replay.rp_status = nfserr;       \
1212                 stateowner->so_replay.rp_buflen =               \
1213                           (((char *)(resp)->p - (char *)save)); \
1214                 memcpy(stateowner->so_replay.rp_buf, save,      \
1215                         stateowner->so_replay.rp_buflen);       \
1216         } } while (0);
1217
1218 /* Encode as an array of strings the string given with components
1219  * seperated @sep.
1220  */
1221 static __be32 nfsd4_encode_components(char sep, char *components,
1222                                    __be32 **pp, int *buflen)
1223 {
1224         __be32 *p = *pp;
1225         __be32 *countp = p;
1226         int strlen, count=0;
1227         char *str, *end;
1228
1229         dprintk("nfsd4_encode_components(%s)\n", components);
1230         if ((*buflen -= 4) < 0)
1231                 return nfserr_resource;
1232         WRITE32(0); /* We will fill this in with @count later */
1233         end = str = components;
1234         while (*end) {
1235                 for (; *end && (*end != sep); end++)
1236                         ; /* Point to end of component */
1237                 strlen = end - str;
1238                 if (strlen) {
1239                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1240                                 return nfserr_resource;
1241                         WRITE32(strlen);
1242                         WRITEMEM(str, strlen);
1243                         count++;
1244                 }
1245                 else
1246                         end++;
1247                 str = end;
1248         }
1249         *pp = p;
1250         p = countp;
1251         WRITE32(count);
1252         return 0;
1253 }
1254
1255 /*
1256  * encode a location element of a fs_locations structure
1257  */
1258 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1259                                     __be32 **pp, int *buflen)
1260 {
1261         __be32 status;
1262         __be32 *p = *pp;
1263
1264         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1265         if (status)
1266                 return status;
1267         status = nfsd4_encode_components('/', location->path, &p, buflen);
1268         if (status)
1269                 return status;
1270         *pp = p;
1271         return 0;
1272 }
1273
1274 /*
1275  * Return the path to an export point in the pseudo filesystem namespace
1276  * Returned string is safe to use as long as the caller holds a reference
1277  * to @exp.
1278  */
1279 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1280 {
1281         struct svc_fh tmp_fh;
1282         char *path, *rootpath;
1283
1284         fh_init(&tmp_fh, NFS4_FHSIZE);
1285         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1286         if (*stat)
1287                 return NULL;
1288         rootpath = tmp_fh.fh_export->ex_pathname;
1289
1290         path = exp->ex_pathname;
1291
1292         if (strncmp(path, rootpath, strlen(rootpath))) {
1293                 dprintk("nfsd: fs_locations failed;"
1294                         "%s is not contained in %s\n", path, rootpath);
1295                 *stat = nfserr_notsupp;
1296                 return NULL;
1297         }
1298
1299         return path + strlen(rootpath);
1300 }
1301
1302 /*
1303  *  encode a fs_locations structure
1304  */
1305 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1306                                      struct svc_export *exp,
1307                                      __be32 **pp, int *buflen)
1308 {
1309         __be32 status;
1310         int i;
1311         __be32 *p = *pp;
1312         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1313         char *root = nfsd4_path(rqstp, exp, &status);
1314
1315         if (status)
1316                 return status;
1317         status = nfsd4_encode_components('/', root, &p, buflen);
1318         if (status)
1319                 return status;
1320         if ((*buflen -= 4) < 0)
1321                 return nfserr_resource;
1322         WRITE32(fslocs->locations_count);
1323         for (i=0; i<fslocs->locations_count; i++) {
1324                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1325                                                    &p, buflen);
1326                 if (status)
1327                         return status;
1328         }
1329         *pp = p;
1330         return 0;
1331 }
1332
1333 static u32 nfs4_ftypes[16] = {
1334         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1335         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1336         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1337         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1338 };
1339
1340 static __be32
1341 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1342                         __be32 **p, int *buflen)
1343 {
1344         int status;
1345
1346         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1347                 return nfserr_resource;
1348         if (whotype != NFS4_ACL_WHO_NAMED)
1349                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1350         else if (group)
1351                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1352         else
1353                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1354         if (status < 0)
1355                 return nfserrno(status);
1356         *p = xdr_encode_opaque(*p, NULL, status);
1357         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1358         BUG_ON(*buflen < 0);
1359         return 0;
1360 }
1361
1362 static inline __be32
1363 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1364 {
1365         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1366 }
1367
1368 static inline __be32
1369 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1370 {
1371         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1372 }
1373
1374 static inline __be32
1375 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1376                 __be32 **p, int *buflen)
1377 {
1378         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1379 }
1380
1381 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1382                               FATTR4_WORD0_RDATTR_ERROR)
1383 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1384
1385 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1386 {
1387         /* As per referral draft:  */
1388         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1389             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1390                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1391                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1392                         *rdattr_err = NFSERR_MOVED;
1393                 else
1394                         return nfserr_moved;
1395         }
1396         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1397         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1398         return 0;
1399 }
1400
1401 /*
1402  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1403  * ourselves.
1404  *
1405  * @countp is the buffer size in _words_; upon successful return this becomes
1406  * replaced with the number of words written.
1407  */
1408 __be32
1409 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1410                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1411                 struct svc_rqst *rqstp, int ignore_crossmnt)
1412 {
1413         u32 bmval0 = bmval[0];
1414         u32 bmval1 = bmval[1];
1415         struct kstat stat;
1416         struct svc_fh tempfh;
1417         struct kstatfs statfs;
1418         int buflen = *countp << 2;
1419         __be32 *attrlenp;
1420         u32 dummy;
1421         u64 dummy64;
1422         u32 rdattr_err = 0;
1423         __be32 *p = buffer;
1424         __be32 status;
1425         int err;
1426         int aclsupport = 0;
1427         struct nfs4_acl *acl = NULL;
1428
1429         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1430         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1431         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1432
1433         if (exp->ex_fslocs.migrated) {
1434                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1435                 if (status)
1436                         goto out;
1437         }
1438
1439         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1440         if (err)
1441                 goto out_nfserr;
1442         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1443                         FATTR4_WORD0_MAXNAME)) ||
1444             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1445                        FATTR4_WORD1_SPACE_TOTAL))) {
1446                 err = vfs_statfs(dentry, &statfs);
1447                 if (err)
1448                         goto out_nfserr;
1449         }
1450         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1451                 fh_init(&tempfh, NFS4_FHSIZE);
1452                 status = fh_compose(&tempfh, exp, dentry, NULL);
1453                 if (status)
1454                         goto out;
1455                 fhp = &tempfh;
1456         }
1457         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1458                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1459                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1460                 aclsupport = (err == 0);
1461                 if (bmval0 & FATTR4_WORD0_ACL) {
1462                         if (err == -EOPNOTSUPP)
1463                                 bmval0 &= ~FATTR4_WORD0_ACL;
1464                         else if (err == -EINVAL) {
1465                                 status = nfserr_attrnotsupp;
1466                                 goto out;
1467                         } else if (err != 0)
1468                                 goto out_nfserr;
1469                 }
1470         }
1471         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1472                 if (exp->ex_fslocs.locations == NULL) {
1473                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1474                 }
1475         }
1476         if ((buflen -= 16) < 0)
1477                 goto out_resource;
1478
1479         WRITE32(2);
1480         WRITE32(bmval0);
1481         WRITE32(bmval1);
1482         attrlenp = p++;                /* to be backfilled later */
1483
1484         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1485                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1486                 if ((buflen -= 12) < 0)
1487                         goto out_resource;
1488                 if (!aclsupport)
1489                         word0 &= ~FATTR4_WORD0_ACL;
1490                 if (!exp->ex_fslocs.locations)
1491                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1492                 WRITE32(2);
1493                 WRITE32(word0);
1494                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1495         }
1496         if (bmval0 & FATTR4_WORD0_TYPE) {
1497                 if ((buflen -= 4) < 0)
1498                         goto out_resource;
1499                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1500                 if (dummy == NF4BAD)
1501                         goto out_serverfault;
1502                 WRITE32(dummy);
1503         }
1504         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1505                 if ((buflen -= 4) < 0)
1506                         goto out_resource;
1507                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1508                         WRITE32(NFS4_FH_PERSISTENT);
1509                 else
1510                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1511         }
1512         if (bmval0 & FATTR4_WORD0_CHANGE) {
1513                 /*
1514                  * Note: This _must_ be consistent with the scheme for writing
1515                  * change_info, so any changes made here must be reflected there
1516                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1517                  * macro above.)
1518                  */
1519                 if ((buflen -= 8) < 0)
1520                         goto out_resource;
1521                 WRITE32(stat.ctime.tv_sec);
1522                 WRITE32(stat.ctime.tv_nsec);
1523         }
1524         if (bmval0 & FATTR4_WORD0_SIZE) {
1525                 if ((buflen -= 8) < 0)
1526                         goto out_resource;
1527                 WRITE64(stat.size);
1528         }
1529         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1530                 if ((buflen -= 4) < 0)
1531                         goto out_resource;
1532                 WRITE32(1);
1533         }
1534         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1535                 if ((buflen -= 4) < 0)
1536                         goto out_resource;
1537                 WRITE32(1);
1538         }
1539         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1540                 if ((buflen -= 4) < 0)
1541                         goto out_resource;
1542                 WRITE32(0);
1543         }
1544         if (bmval0 & FATTR4_WORD0_FSID) {
1545                 if ((buflen -= 16) < 0)
1546                         goto out_resource;
1547                 if (exp->ex_fslocs.migrated) {
1548                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1549                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1550                 } else switch(fsid_source(fhp)) {
1551                 case FSIDSOURCE_FSID:
1552                         WRITE64((u64)exp->ex_fsid);
1553                         WRITE64((u64)0);
1554                         break;
1555                 case FSIDSOURCE_DEV:
1556                         WRITE32(0);
1557                         WRITE32(MAJOR(stat.dev));
1558                         WRITE32(0);
1559                         WRITE32(MINOR(stat.dev));
1560                         break;
1561                 case FSIDSOURCE_UUID:
1562                         WRITEMEM(exp->ex_uuid, 16);
1563                         break;
1564                 }
1565         }
1566         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1567                 if ((buflen -= 4) < 0)
1568                         goto out_resource;
1569                 WRITE32(0);
1570         }
1571         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1572                 if ((buflen -= 4) < 0)
1573                         goto out_resource;
1574                 WRITE32(NFSD_LEASE_TIME);
1575         }
1576         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1577                 if ((buflen -= 4) < 0)
1578                         goto out_resource;
1579                 WRITE32(rdattr_err);
1580         }
1581         if (bmval0 & FATTR4_WORD0_ACL) {
1582                 struct nfs4_ace *ace;
1583
1584                 if (acl == NULL) {
1585                         if ((buflen -= 4) < 0)
1586                                 goto out_resource;
1587
1588                         WRITE32(0);
1589                         goto out_acl;
1590                 }
1591                 if ((buflen -= 4) < 0)
1592                         goto out_resource;
1593                 WRITE32(acl->naces);
1594
1595                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1596                         if ((buflen -= 4*3) < 0)
1597                                 goto out_resource;
1598                         WRITE32(ace->type);
1599                         WRITE32(ace->flag);
1600                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1601                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1602                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1603                                 &p, &buflen);
1604                         if (status == nfserr_resource)
1605                                 goto out_resource;
1606                         if (status)
1607                                 goto out;
1608                 }
1609         }
1610 out_acl:
1611         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1612                 if ((buflen -= 4) < 0)
1613                         goto out_resource;
1614                 WRITE32(aclsupport ?
1615                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1616         }
1617         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1618                 if ((buflen -= 4) < 0)
1619                         goto out_resource;
1620                 WRITE32(1);
1621         }
1622         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1623                 if ((buflen -= 4) < 0)
1624                         goto out_resource;
1625                 WRITE32(1);
1626         }
1627         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1628                 if ((buflen -= 4) < 0)
1629                         goto out_resource;
1630                 WRITE32(1);
1631         }
1632         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1633                 if ((buflen -= 4) < 0)
1634                         goto out_resource;
1635                 WRITE32(1);
1636         }
1637         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1638                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1639                 if (buflen < 0)
1640                         goto out_resource;
1641                 WRITE32(fhp->fh_handle.fh_size);
1642                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1643         }
1644         if (bmval0 & FATTR4_WORD0_FILEID) {
1645                 if ((buflen -= 8) < 0)
1646                         goto out_resource;
1647                 WRITE64(stat.ino);
1648         }
1649         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1650                 if ((buflen -= 8) < 0)
1651                         goto out_resource;
1652                 WRITE64((u64) statfs.f_ffree);
1653         }
1654         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1655                 if ((buflen -= 8) < 0)
1656                         goto out_resource;
1657                 WRITE64((u64) statfs.f_ffree);
1658         }
1659         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1660                 if ((buflen -= 8) < 0)
1661                         goto out_resource;
1662                 WRITE64((u64) statfs.f_files);
1663         }
1664         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1665                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1666                 if (status == nfserr_resource)
1667                         goto out_resource;
1668                 if (status)
1669                         goto out;
1670         }
1671         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1672                 if ((buflen -= 4) < 0)
1673                         goto out_resource;
1674                 WRITE32(1);
1675         }
1676         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1677                 if ((buflen -= 8) < 0)
1678                         goto out_resource;
1679                 WRITE64(~(u64)0);
1680         }
1681         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1682                 if ((buflen -= 4) < 0)
1683                         goto out_resource;
1684                 WRITE32(255);
1685         }
1686         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1687                 if ((buflen -= 4) < 0)
1688                         goto out_resource;
1689                 WRITE32(statfs.f_namelen);
1690         }
1691         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1692                 if ((buflen -= 8) < 0)
1693                         goto out_resource;
1694                 WRITE64((u64) svc_max_payload(rqstp));
1695         }
1696         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1697                 if ((buflen -= 8) < 0)
1698                         goto out_resource;
1699                 WRITE64((u64) svc_max_payload(rqstp));
1700         }
1701         if (bmval1 & FATTR4_WORD1_MODE) {
1702                 if ((buflen -= 4) < 0)
1703                         goto out_resource;
1704                 WRITE32(stat.mode & S_IALLUGO);
1705         }
1706         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1707                 if ((buflen -= 4) < 0)
1708                         goto out_resource;
1709                 WRITE32(1);
1710         }
1711         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1712                 if ((buflen -= 4) < 0)
1713                         goto out_resource;
1714                 WRITE32(stat.nlink);
1715         }
1716         if (bmval1 & FATTR4_WORD1_OWNER) {
1717                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1718                 if (status == nfserr_resource)
1719                         goto out_resource;
1720                 if (status)
1721                         goto out;
1722         }
1723         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1724                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1725                 if (status == nfserr_resource)
1726                         goto out_resource;
1727                 if (status)
1728                         goto out;
1729         }
1730         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1731                 if ((buflen -= 8) < 0)
1732                         goto out_resource;
1733                 WRITE32((u32) MAJOR(stat.rdev));
1734                 WRITE32((u32) MINOR(stat.rdev));
1735         }
1736         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1737                 if ((buflen -= 8) < 0)
1738                         goto out_resource;
1739                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1740                 WRITE64(dummy64);
1741         }
1742         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1743                 if ((buflen -= 8) < 0)
1744                         goto out_resource;
1745                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1746                 WRITE64(dummy64);
1747         }
1748         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1749                 if ((buflen -= 8) < 0)
1750                         goto out_resource;
1751                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1752                 WRITE64(dummy64);
1753         }
1754         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1755                 if ((buflen -= 8) < 0)
1756                         goto out_resource;
1757                 dummy64 = (u64)stat.blocks << 9;
1758                 WRITE64(dummy64);
1759         }
1760         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1761                 if ((buflen -= 12) < 0)
1762                         goto out_resource;
1763                 WRITE32(0);
1764                 WRITE32(stat.atime.tv_sec);
1765                 WRITE32(stat.atime.tv_nsec);
1766         }
1767         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1768                 if ((buflen -= 12) < 0)
1769                         goto out_resource;
1770                 WRITE32(0);
1771                 WRITE32(1);
1772                 WRITE32(0);
1773         }
1774         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1775                 if ((buflen -= 12) < 0)
1776                         goto out_resource;
1777                 WRITE32(0);
1778                 WRITE32(stat.ctime.tv_sec);
1779                 WRITE32(stat.ctime.tv_nsec);
1780         }
1781         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1782                 if ((buflen -= 12) < 0)
1783                         goto out_resource;
1784                 WRITE32(0);
1785                 WRITE32(stat.mtime.tv_sec);
1786                 WRITE32(stat.mtime.tv_nsec);
1787         }
1788         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1789                 if ((buflen -= 8) < 0)
1790                         goto out_resource;
1791                 /*
1792                  * Get parent's attributes if not ignoring crossmount
1793                  * and this is the root of a cross-mounted filesystem.
1794                  */
1795                 if (ignore_crossmnt == 0 &&
1796                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
1797                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
1798                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
1799                         if (err)
1800                                 goto out_nfserr;
1801                 }
1802                 WRITE64(stat.ino);
1803         }
1804         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1805         *countp = p - buffer;
1806         status = nfs_ok;
1807
1808 out:
1809         kfree(acl);
1810         if (fhp == &tempfh)
1811                 fh_put(&tempfh);
1812         return status;
1813 out_nfserr:
1814         status = nfserrno(err);
1815         goto out;
1816 out_resource:
1817         *countp = 0;
1818         status = nfserr_resource;
1819         goto out;
1820 out_serverfault:
1821         status = nfserr_serverfault;
1822         goto out;
1823 }
1824
1825 static inline int attributes_need_mount(u32 *bmval)
1826 {
1827         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
1828                 return 1;
1829         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
1830                 return 1;
1831         return 0;
1832 }
1833
1834 static __be32
1835 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1836                 const char *name, int namlen, __be32 *p, int *buflen)
1837 {
1838         struct svc_export *exp = cd->rd_fhp->fh_export;
1839         struct dentry *dentry;
1840         __be32 nfserr;
1841         int ignore_crossmnt = 0;
1842
1843         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1844         if (IS_ERR(dentry))
1845                 return nfserrno(PTR_ERR(dentry));
1846
1847         exp_get(exp);
1848         /*
1849          * In the case of a mountpoint, the client may be asking for
1850          * attributes that are only properties of the underlying filesystem
1851          * as opposed to the cross-mounted file system. In such a case,
1852          * we will not follow the cross mount and will fill the attribtutes
1853          * directly from the mountpoint dentry.
1854          */
1855         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
1856                 ignore_crossmnt = 1;
1857         else if (d_mountpoint(dentry)) {
1858                 int err;
1859
1860                 /*
1861                  * Why the heck aren't we just using nfsd_lookup??
1862                  * Different "."/".." handling?  Something else?
1863                  * At least, add a comment here to explain....
1864                  */
1865                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1866                 if (err) {
1867                         nfserr = nfserrno(err);
1868                         goto out_put;
1869                 }
1870                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
1871                 if (nfserr)
1872                         goto out_put;
1873
1874         }
1875         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1876                                         cd->rd_rqstp, ignore_crossmnt);
1877 out_put:
1878         dput(dentry);
1879         exp_put(exp);
1880         return nfserr;
1881 }
1882
1883 static __be32 *
1884 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1885 {
1886         __be32 *attrlenp;
1887
1888         if (buflen < 6)
1889                 return NULL;
1890         *p++ = htonl(2);
1891         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1892         *p++ = htonl(0);                         /* bmval1 */
1893
1894         attrlenp = p++;
1895         *p++ = nfserr;       /* no htonl */
1896         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1897         return p;
1898 }
1899
1900 static int
1901 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1902                     loff_t offset, u64 ino, unsigned int d_type)
1903 {
1904         struct readdir_cd *ccd = ccdv;
1905         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1906         int buflen;
1907         __be32 *p = cd->buffer;
1908         __be32 nfserr = nfserr_toosmall;
1909
1910         /* In nfsv4, "." and ".." never make it onto the wire.. */
1911         if (name && isdotent(name, namlen)) {
1912                 cd->common.err = nfs_ok;
1913                 return 0;
1914         }
1915
1916         if (cd->offset)
1917                 xdr_encode_hyper(cd->offset, (u64) offset);
1918
1919         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1920         if (buflen < 0)
1921                 goto fail;
1922
1923         *p++ = xdr_one;                             /* mark entry present */
1924         cd->offset = p;                             /* remember pointer */
1925         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1926         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1927
1928         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1929         switch (nfserr) {
1930         case nfs_ok:
1931                 p += buflen;
1932                 break;
1933         case nfserr_resource:
1934                 nfserr = nfserr_toosmall;
1935                 goto fail;
1936         case nfserr_dropit:
1937                 goto fail;
1938         default:
1939                 /*
1940                  * If the client requested the RDATTR_ERROR attribute,
1941                  * we stuff the error code into this attribute
1942                  * and continue.  If this attribute was not requested,
1943                  * then in accordance with the spec, we fail the
1944                  * entire READDIR operation(!)
1945                  */
1946                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1947                         goto fail;
1948                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1949                 if (p == NULL) {
1950                         nfserr = nfserr_toosmall;
1951                         goto fail;
1952                 }
1953         }
1954         cd->buflen -= (p - cd->buffer);
1955         cd->buffer = p;
1956         cd->common.err = nfs_ok;
1957         return 0;
1958 fail:
1959         cd->common.err = nfserr;
1960         return -EINVAL;
1961 }
1962
1963 static void
1964 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
1965 {
1966         ENCODE_HEAD;
1967
1968         RESERVE_SPACE(sizeof(stateid_t));
1969         WRITE32(sid->si_generation);
1970         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
1971         ADJUST_ARGS();
1972 }
1973
1974 static __be32
1975 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1976 {
1977         ENCODE_HEAD;
1978
1979         if (!nfserr) {
1980                 RESERVE_SPACE(8);
1981                 WRITE32(access->ac_supported);
1982                 WRITE32(access->ac_resp_access);
1983                 ADJUST_ARGS();
1984         }
1985         return nfserr;
1986 }
1987
1988 static __be32
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                 nfsd4_encode_stateid(resp, &close->cl_stateid);
1995
1996         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1997         return nfserr;
1998 }
1999
2000
2001 static __be32
2002 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2003 {
2004         ENCODE_HEAD;
2005
2006         if (!nfserr) {
2007                 RESERVE_SPACE(8);
2008                 WRITEMEM(commit->co_verf.data, 8);
2009                 ADJUST_ARGS();
2010         }
2011         return nfserr;
2012 }
2013
2014 static __be32
2015 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2016 {
2017         ENCODE_HEAD;
2018
2019         if (!nfserr) {
2020                 RESERVE_SPACE(32);
2021                 WRITECINFO(create->cr_cinfo);
2022                 WRITE32(2);
2023                 WRITE32(create->cr_bmval[0]);
2024                 WRITE32(create->cr_bmval[1]);
2025                 ADJUST_ARGS();
2026         }
2027         return nfserr;
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, 0);
2043         if (!nfserr)
2044                 resp->p += buflen;
2045         return nfserr;
2046 }
2047
2048 static __be32
2049 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2050 {
2051         struct svc_fh *fhp = *fhpp;
2052         unsigned int len;
2053         ENCODE_HEAD;
2054
2055         if (!nfserr) {
2056                 len = fhp->fh_handle.fh_size;
2057                 RESERVE_SPACE(len + 4);
2058                 WRITE32(len);
2059                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2060                 ADJUST_ARGS();
2061         }
2062         return nfserr;
2063 }
2064
2065 /*
2066 * Including all fields other than the name, a LOCK4denied structure requires
2067 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2068 */
2069 static void
2070 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2071 {
2072         ENCODE_HEAD;
2073
2074         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2075         WRITE64(ld->ld_start);
2076         WRITE64(ld->ld_length);
2077         WRITE32(ld->ld_type);
2078         if (ld->ld_sop) {
2079                 WRITEMEM(&ld->ld_clientid, 8);
2080                 WRITE32(ld->ld_sop->so_owner.len);
2081                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2082                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2083         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2084                 WRITE64((u64)0); /* clientid */
2085                 WRITE32(0); /* length of owner name */
2086         }
2087         ADJUST_ARGS();
2088 }
2089
2090 static __be32
2091 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2092 {
2093         ENCODE_SEQID_OP_HEAD;
2094
2095         if (!nfserr)
2096                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2097         else if (nfserr == nfserr_denied)
2098                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2099
2100         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2101         return nfserr;
2102 }
2103
2104 static __be32
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         return nfserr;
2110 }
2111
2112 static __be32
2113 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2114 {
2115         ENCODE_SEQID_OP_HEAD;
2116
2117         if (!nfserr)
2118                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2119
2120         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2121         return nfserr;
2122 }
2123
2124
2125 static __be32
2126 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2127 {
2128         ENCODE_HEAD;
2129
2130         if (!nfserr) {
2131                 RESERVE_SPACE(20);
2132                 WRITECINFO(link->li_cinfo);
2133                 ADJUST_ARGS();
2134         }
2135         return nfserr;
2136 }
2137
2138
2139 static __be32
2140 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2141 {
2142         ENCODE_HEAD;
2143         ENCODE_SEQID_OP_HEAD;
2144
2145         if (nfserr)
2146                 goto out;
2147
2148         nfsd4_encode_stateid(resp, &open->op_stateid);
2149         RESERVE_SPACE(40);
2150         WRITECINFO(open->op_cinfo);
2151         WRITE32(open->op_rflags);
2152         WRITE32(2);
2153         WRITE32(open->op_bmval[0]);
2154         WRITE32(open->op_bmval[1]);
2155         WRITE32(open->op_delegate_type);
2156         ADJUST_ARGS();
2157
2158         switch (open->op_delegate_type) {
2159         case NFS4_OPEN_DELEGATE_NONE:
2160                 break;
2161         case NFS4_OPEN_DELEGATE_READ:
2162                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2163                 RESERVE_SPACE(20);
2164                 WRITE32(open->op_recall);
2165
2166                 /*
2167                  * TODO: ACE's in delegations
2168                  */
2169                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2170                 WRITE32(0);
2171                 WRITE32(0);
2172                 WRITE32(0);   /* XXX: is NULL principal ok? */
2173                 ADJUST_ARGS();
2174                 break;
2175         case NFS4_OPEN_DELEGATE_WRITE:
2176                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2177                 RESERVE_SPACE(32);
2178                 WRITE32(0);
2179
2180                 /*
2181                  * TODO: space_limit's in delegations
2182                  */
2183                 WRITE32(NFS4_LIMIT_SIZE);
2184                 WRITE32(~(u32)0);
2185                 WRITE32(~(u32)0);
2186
2187                 /*
2188                  * TODO: ACE's in delegations
2189                  */
2190                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2191                 WRITE32(0);
2192                 WRITE32(0);
2193                 WRITE32(0);   /* XXX: is NULL principal ok? */
2194                 ADJUST_ARGS();
2195                 break;
2196         default:
2197                 BUG();
2198         }
2199         /* XXX save filehandle here */
2200 out:
2201         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2202         return nfserr;
2203 }
2204
2205 static __be32
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                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2212
2213         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2214         return nfserr;
2215 }
2216
2217 static __be32
2218 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2219 {
2220         ENCODE_SEQID_OP_HEAD;
2221
2222         if (!nfserr)
2223                 nfsd4_encode_stateid(resp, &od->od_stateid);
2224
2225         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2226         return nfserr;
2227 }
2228
2229 static __be32
2230 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2231                   struct nfsd4_read *read)
2232 {
2233         u32 eof;
2234         int v, pn;
2235         unsigned long maxcount;
2236         long len;
2237         ENCODE_HEAD;
2238
2239         if (nfserr)
2240                 return nfserr;
2241         if (resp->xbuf->page_len)
2242                 return nfserr_resource;
2243
2244         RESERVE_SPACE(8); /* eof flag and byte count */
2245
2246         maxcount = svc_max_payload(resp->rqstp);
2247         if (maxcount > read->rd_length)
2248                 maxcount = read->rd_length;
2249
2250         len = maxcount;
2251         v = 0;
2252         while (len > 0) {
2253                 pn = resp->rqstp->rq_resused++;
2254                 resp->rqstp->rq_vec[v].iov_base =
2255                         page_address(resp->rqstp->rq_respages[pn]);
2256                 resp->rqstp->rq_vec[v].iov_len =
2257                         len < PAGE_SIZE ? len : PAGE_SIZE;
2258                 v++;
2259                 len -= PAGE_SIZE;
2260         }
2261         read->rd_vlen = v;
2262
2263         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2264                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2265                         &maxcount);
2266
2267         if (nfserr == nfserr_symlink)
2268                 nfserr = nfserr_inval;
2269         if (nfserr)
2270                 return nfserr;
2271         eof = (read->rd_offset + maxcount >=
2272                read->rd_fhp->fh_dentry->d_inode->i_size);
2273
2274         WRITE32(eof);
2275         WRITE32(maxcount);
2276         ADJUST_ARGS();
2277         resp->xbuf->head[0].iov_len = (char*)p
2278                                         - (char*)resp->xbuf->head[0].iov_base;
2279         resp->xbuf->page_len = maxcount;
2280
2281         /* Use rest of head for padding and remaining ops: */
2282         resp->xbuf->tail[0].iov_base = p;
2283         resp->xbuf->tail[0].iov_len = 0;
2284         if (maxcount&3) {
2285                 RESERVE_SPACE(4);
2286                 WRITE32(0);
2287                 resp->xbuf->tail[0].iov_base += maxcount&3;
2288                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2289                 ADJUST_ARGS();
2290         }
2291         return 0;
2292 }
2293
2294 static __be32
2295 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2296 {
2297         int maxcount;
2298         char *page;
2299         ENCODE_HEAD;
2300
2301         if (nfserr)
2302                 return nfserr;
2303         if (resp->xbuf->page_len)
2304                 return nfserr_resource;
2305
2306         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2307
2308         maxcount = PAGE_SIZE;
2309         RESERVE_SPACE(4);
2310
2311         /*
2312          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2313          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2314          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2315          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2316          */
2317         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2318         if (nfserr == nfserr_isdir)
2319                 return nfserr_inval;
2320         if (nfserr)
2321                 return nfserr;
2322
2323         WRITE32(maxcount);
2324         ADJUST_ARGS();
2325         resp->xbuf->head[0].iov_len = (char*)p
2326                                 - (char*)resp->xbuf->head[0].iov_base;
2327         resp->xbuf->page_len = maxcount;
2328
2329         /* Use rest of head for padding and remaining ops: */
2330         resp->xbuf->tail[0].iov_base = p;
2331         resp->xbuf->tail[0].iov_len = 0;
2332         if (maxcount&3) {
2333                 RESERVE_SPACE(4);
2334                 WRITE32(0);
2335                 resp->xbuf->tail[0].iov_base += maxcount&3;
2336                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2337                 ADJUST_ARGS();
2338         }
2339         return 0;
2340 }
2341
2342 static __be32
2343 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2344 {
2345         int maxcount;
2346         loff_t offset;
2347         __be32 *page, *savep, *tailbase;
2348         ENCODE_HEAD;
2349
2350         if (nfserr)
2351                 return nfserr;
2352         if (resp->xbuf->page_len)
2353                 return nfserr_resource;
2354
2355         RESERVE_SPACE(8);  /* verifier */
2356         savep = p;
2357
2358         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2359         WRITE32(0);
2360         WRITE32(0);
2361         ADJUST_ARGS();
2362         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2363         tailbase = p;
2364
2365         maxcount = PAGE_SIZE;
2366         if (maxcount > readdir->rd_maxcount)
2367                 maxcount = readdir->rd_maxcount;
2368
2369         /*
2370          * Convert from bytes to words, account for the two words already
2371          * written, make sure to leave two words at the end for the next
2372          * pointer and eof field.
2373          */
2374         maxcount = (maxcount >> 2) - 4;
2375         if (maxcount < 0) {
2376                 nfserr =  nfserr_toosmall;
2377                 goto err_no_verf;
2378         }
2379
2380         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2381         readdir->common.err = 0;
2382         readdir->buflen = maxcount;
2383         readdir->buffer = page;
2384         readdir->offset = NULL;
2385
2386         offset = readdir->rd_cookie;
2387         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2388                               &offset,
2389                               &readdir->common, nfsd4_encode_dirent);
2390         if (nfserr == nfs_ok &&
2391             readdir->common.err == nfserr_toosmall &&
2392             readdir->buffer == page)
2393                 nfserr = nfserr_toosmall;
2394         if (nfserr == nfserr_symlink)
2395                 nfserr = nfserr_notdir;
2396         if (nfserr)
2397                 goto err_no_verf;
2398
2399         if (readdir->offset)
2400                 xdr_encode_hyper(readdir->offset, offset);
2401
2402         p = readdir->buffer;
2403         *p++ = 0;       /* no more entries */
2404         *p++ = htonl(readdir->common.err == nfserr_eof);
2405         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2406                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2407
2408         /* Use rest of head for padding and remaining ops: */
2409         resp->xbuf->tail[0].iov_base = tailbase;
2410         resp->xbuf->tail[0].iov_len = 0;
2411         resp->p = resp->xbuf->tail[0].iov_base;
2412         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2413
2414         return 0;
2415 err_no_verf:
2416         p = savep;
2417         ADJUST_ARGS();
2418         return nfserr;
2419 }
2420
2421 static __be32
2422 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2423 {
2424         ENCODE_HEAD;
2425
2426         if (!nfserr) {
2427                 RESERVE_SPACE(20);
2428                 WRITECINFO(remove->rm_cinfo);
2429                 ADJUST_ARGS();
2430         }
2431         return nfserr;
2432 }
2433
2434 static __be32
2435 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2436 {
2437         ENCODE_HEAD;
2438
2439         if (!nfserr) {
2440                 RESERVE_SPACE(40);
2441                 WRITECINFO(rename->rn_sinfo);
2442                 WRITECINFO(rename->rn_tinfo);
2443                 ADJUST_ARGS();
2444         }
2445         return nfserr;
2446 }
2447
2448 static __be32
2449 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2450                      struct nfsd4_secinfo *secinfo)
2451 {
2452         int i = 0;
2453         struct svc_export *exp = secinfo->si_exp;
2454         u32 nflavs;
2455         struct exp_flavor_info *flavs;
2456         struct exp_flavor_info def_flavs[2];
2457         ENCODE_HEAD;
2458
2459         if (nfserr)
2460                 goto out;
2461         if (exp->ex_nflavors) {
2462                 flavs = exp->ex_flavors;
2463                 nflavs = exp->ex_nflavors;
2464         } else { /* Handling of some defaults in absence of real secinfo: */
2465                 flavs = def_flavs;
2466                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2467                         nflavs = 2;
2468                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2469                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2470                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2471                         nflavs = 1;
2472                         flavs[0].pseudoflavor
2473                                         = svcauth_gss_flavor(exp->ex_client);
2474                 } else {
2475                         nflavs = 1;
2476                         flavs[0].pseudoflavor
2477                                         = exp->ex_client->flavour->flavour;
2478                 }
2479         }
2480
2481         RESERVE_SPACE(4);
2482         WRITE32(nflavs);
2483         ADJUST_ARGS();
2484         for (i = 0; i < nflavs; i++) {
2485                 u32 flav = flavs[i].pseudoflavor;
2486                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2487
2488                 if (gm) {
2489                         RESERVE_SPACE(4);
2490                         WRITE32(RPC_AUTH_GSS);
2491                         ADJUST_ARGS();
2492                         RESERVE_SPACE(4 + gm->gm_oid.len);
2493                         WRITE32(gm->gm_oid.len);
2494                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2495                         ADJUST_ARGS();
2496                         RESERVE_SPACE(4);
2497                         WRITE32(0); /* qop */
2498                         ADJUST_ARGS();
2499                         RESERVE_SPACE(4);
2500                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2501                         ADJUST_ARGS();
2502                         gss_mech_put(gm);
2503                 } else {
2504                         RESERVE_SPACE(4);
2505                         WRITE32(flav);
2506                         ADJUST_ARGS();
2507                 }
2508         }
2509 out:
2510         if (exp)
2511                 exp_put(exp);
2512         return nfserr;
2513 }
2514
2515 /*
2516  * The SETATTR encode routine is special -- it always encodes a bitmap,
2517  * regardless of the error status.
2518  */
2519 static __be32
2520 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2521 {
2522         ENCODE_HEAD;
2523
2524         RESERVE_SPACE(12);
2525         if (nfserr) {
2526                 WRITE32(2);
2527                 WRITE32(0);
2528                 WRITE32(0);
2529         }
2530         else {
2531                 WRITE32(2);
2532                 WRITE32(setattr->sa_bmval[0]);
2533                 WRITE32(setattr->sa_bmval[1]);
2534         }
2535         ADJUST_ARGS();
2536         return nfserr;
2537 }
2538
2539 static __be32
2540 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2541 {
2542         ENCODE_HEAD;
2543
2544         if (!nfserr) {
2545                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2546                 WRITEMEM(&scd->se_clientid, 8);
2547                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2548                 ADJUST_ARGS();
2549         }
2550         else if (nfserr == nfserr_clid_inuse) {
2551                 RESERVE_SPACE(8);
2552                 WRITE32(0);
2553                 WRITE32(0);
2554                 ADJUST_ARGS();
2555         }
2556         return nfserr;
2557 }
2558
2559 static __be32
2560 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2561 {
2562         ENCODE_HEAD;
2563
2564         if (!nfserr) {
2565                 RESERVE_SPACE(16);
2566                 WRITE32(write->wr_bytes_written);
2567                 WRITE32(write->wr_how_written);
2568                 WRITEMEM(write->wr_verifier.data, 8);
2569                 ADJUST_ARGS();
2570         }
2571         return nfserr;
2572 }
2573
2574 static __be32
2575 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
2576 {
2577         return nfserr;
2578 }
2579
2580 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
2581
2582 static nfsd4_enc nfsd4_enc_ops[] = {
2583         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
2584         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
2585         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
2586         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
2587         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
2588         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
2589         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
2590         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
2591         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
2592         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
2593         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
2594         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
2595         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
2596         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
2597         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
2598         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
2599         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
2600         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
2601         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
2602         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
2603         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
2604         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
2605         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
2606         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
2607         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
2608         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
2609         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
2610         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
2611         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
2612         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
2613         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
2614         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
2615         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
2616         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
2617         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
2618         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
2619         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
2620 };
2621
2622 void
2623 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2624 {
2625         __be32 *statp;
2626         ENCODE_HEAD;
2627
2628         RESERVE_SPACE(8);
2629         WRITE32(op->opnum);
2630         statp = p++;    /* to be backfilled at the end */
2631         ADJUST_ARGS();
2632
2633         if (op->opnum == OP_ILLEGAL)
2634                 goto status;
2635         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
2636                !nfsd4_enc_ops[op->opnum]);
2637         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
2638 status:
2639         /*
2640          * Note: We write the status directly, instead of using WRITE32(),
2641          * since it is already in network byte order.
2642          */
2643         *statp = op->status;
2644 }
2645
2646 /*
2647  * Encode the reply stored in the stateowner reply cache
2648  *
2649  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2650  * previously sent already encoded operation.
2651  *
2652  * called with nfs4_lock_state() held
2653  */
2654 void
2655 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2656 {
2657         ENCODE_HEAD;
2658         struct nfs4_replay *rp = op->replay;
2659
2660         BUG_ON(!rp);
2661
2662         RESERVE_SPACE(8);
2663         WRITE32(op->opnum);
2664         *p++ = rp->rp_status;  /* already xdr'ed */
2665         ADJUST_ARGS();
2666
2667         RESERVE_SPACE(rp->rp_buflen);
2668         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2669         ADJUST_ARGS();
2670 }
2671
2672 /*
2673  * END OF "GENERIC" ENCODE ROUTINES.
2674  */
2675
2676 int
2677 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2678 {
2679         return xdr_ressize_check(rqstp, p);
2680 }
2681
2682 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2683 {
2684         if (args->ops != args->iops) {
2685                 kfree(args->ops);
2686                 args->ops = args->iops;
2687         }
2688         kfree(args->tmpp);
2689         args->tmpp = NULL;
2690         while (args->to_free) {
2691                 struct tmpbuf *tb = args->to_free;
2692                 args->to_free = tb->next;
2693                 tb->release(tb->buf);
2694                 kfree(tb);
2695         }
2696 }
2697
2698 int
2699 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2700 {
2701         __be32 status;
2702
2703         args->p = p;
2704         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2705         args->pagelist = rqstp->rq_arg.pages;
2706         args->pagelen = rqstp->rq_arg.page_len;
2707         args->tmpp = NULL;
2708         args->to_free = NULL;
2709         args->ops = args->iops;
2710         args->rqstp = rqstp;
2711
2712         status = nfsd4_decode_compound(args);
2713         if (status) {
2714                 nfsd4_release_compoundargs(args);
2715         }
2716         return !status;
2717 }
2718
2719 int
2720 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2721 {
2722         /*
2723          * All that remains is to write the tag and operation count...
2724          */
2725         struct kvec *iov;
2726         p = resp->tagp;
2727         *p++ = htonl(resp->taglen);
2728         memcpy(p, resp->tag, resp->taglen);
2729         p += XDR_QUADLEN(resp->taglen);
2730         *p++ = htonl(resp->opcnt);
2731
2732         if (rqstp->rq_res.page_len)
2733                 iov = &rqstp->rq_res.tail[0];
2734         else
2735                 iov = &rqstp->rq_res.head[0];
2736         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2737         BUG_ON(iov->iov_len > PAGE_SIZE);
2738         return 1;
2739 }
2740
2741 /*
2742  * Local variables:
2743  *  c-basic-offset: 8
2744  * End:
2745  */