fs/nfsd/nfs4xdr.c

   1 /*
   2  *  fs/nfs/nfs4xdr.c
   3  *
   4  *  Server-side XDR for NFSv4
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * TODO: Neil Brown made the following observation:  We currently
  38  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  39  * never release any of that until the request is complete.
  40  * It would be good to calculate a new maximum response size while
  41  * decoding the COMPOUND, and call svc_reserve with this number
  42  * at the end of nfs4svc_decode_compoundargs.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/smp.h>
  47 #include <linux/fs.h>
  48 #include <linux/namei.h>
  49 #include <linux/vfs.h>
  50 #include <linux/sunrpc/xdr.h>
  51 #include <linux/sunrpc/svc.h>
  52 #include <linux/sunrpc/clnt.h>
  53 #include <linux/nfsd/nfsd.h>
  54 #include <linux/nfsd/state.h>
  55 #include <linux/nfsd/xdr4.h>
  56 #include <linux/nfsd_idmap.h>
  57 #include <linux/nfs4.h>
  58 #include <linux/nfs4_acl.h>
  59 #include <linux/sunrpc/gss_api.h>
  60 #include <linux/sunrpc/svcauth_gss.h>
  61
  62 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  63
  64 /*
  65  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  66  * directory in order to indicate to the client that a filesystem boundary is present
  67  * We use a fixed fsid for a referral
  68  */
  69 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  70 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  71
  72 static __be32
  73 check_filename(char *str, int len, __be32 err)
  74 {
  75         int i;
  76
  77         if (len == 0)
  78                 return nfserr_inval;
  79         if (isdotent(str, len))
  80                 return err;
  81         for (i = 0; i < len; i++)
  82                 if (str[i] == '/')
  83                         return err;
  84         return 0;
  85 }
  86
  87 /*
  88  * START OF "GENERIC" DECODE ROUTINES.
  89  *   These may look a little ugly since they are imported from a "generic"
  90  * set of XDR encode/decode routines which are intended to be shared by
  91  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  92  *
  93  * If the pain of reading these is too great, it should be a straightforward
  94  * task to translate them into Linux-specific versions which are more
  95  * consistent with the style used in NFSv2/v3...
  96  */
  97 #define DECODE_HEAD                             \
  98         __be32 *p;                              \
  99         __be32 status
 100 #define DECODE_TAIL                             \
 101         status = 0;                             \
 102 out:                                            \
 103         return status;                          \
 104 xdr_error:                                      \
 105         dprintk("NFSD: xdr error (%s:%d)\n",    \
 106                         __FILE__, __LINE__);    \
 107         status = nfserr_bad_xdr;                \
 108         goto out
 109
 110 #define READ32(x)         (x) = ntohl(*p++)
 111 #define READ64(x)         do {                  \
 112         (x) = (u64)ntohl(*p++) << 32;           \
 113         (x) |= ntohl(*p++);                     \
 114 } while (0)
 115 #define READTIME(x)       do {                  \
 116         p++;                                    \
 117         (x) = ntohl(*p++);                      \
 118         p++;                                    \
 119 } while (0)
 120 #define READMEM(x,nbytes) do {                  \
 121         x = (char *)p;                          \
 122         p += XDR_QUADLEN(nbytes);               \
 123 } while (0)
 124 #define SAVEMEM(x,nbytes) do {                  \
 125         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 126                 savemem(argp, p, nbytes) :      \
 127                 (char *)p)) {                   \
 128                 dprintk("NFSD: xdr error (%s:%d)\n", \
 129                                 __FILE__, __LINE__); \
 130                 goto xdr_error;                 \
 131                 }                               \
 132         p += XDR_QUADLEN(nbytes);               \
 133 } while (0)
 134 #define COPYMEM(x,nbytes) do {                  \
 135         memcpy((x), p, nbytes);                 \
 136         p += XDR_QUADLEN(nbytes);               \
 137 } while (0)
 138
 139 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 140 #define READ_BUF(nbytes)  do {                  \
 141         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 142                 p = argp->p;                    \
 143                 argp->p += XDR_QUADLEN(nbytes); \
 144         } else if (!(p = read_buf(argp, nbytes))) { \
 145                 dprintk("NFSD: xdr error (%s:%d)\n", \
 146                                 __FILE__, __LINE__); \
 147                 goto xdr_error;                 \
 148         }                                       \
 149 } while (0)
 150
 151 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 152 {
 153         /* We want more bytes than seem to be available.
 154          * Maybe we need a new page, maybe we have just run out
 155          */
 156         unsigned int avail = (char *)argp->end - (char *)argp->p;
 157         __be32 *p;
 158         if (avail + argp->pagelen < nbytes)
 159                 return NULL;
 160         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 161                 return NULL;
 162         /* ok, we can do it with the current plus the next page */
 163         if (nbytes <= sizeof(argp->tmp))
 164                 p = argp->tmp;
 165         else {
 166                 kfree(argp->tmpp);
 167                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 168                 if (!p)
 169                         return NULL;
 170
 171         }
 172         /*
 173          * The following memcpy is safe because read_buf is always
 174          * called with nbytes > avail, and the two cases above both
 175          * guarantee p points to at least nbytes bytes.
 176          */
 177         memcpy(p, argp->p, avail);
 178         /* step to next page */
 179         argp->p = page_address(argp->pagelist[0]);
 180         argp->pagelist++;
 181         if (argp->pagelen < PAGE_SIZE) {
 182                 argp->end = p + (argp->pagelen>>2);
 183                 argp->pagelen = 0;
 184         } else {
 185                 argp->end = p + (PAGE_SIZE>>2);
 186                 argp->pagelen -= PAGE_SIZE;
 187         }
 188         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 189         argp->p += XDR_QUADLEN(nbytes - avail);
 190         return p;
 191 }
 192
 193 static int
 194 defer_free(struct nfsd4_compoundargs *argp,
 195                 void (*release)(const void *), void *p)
 196 {
 197         struct tmpbuf *tb;
 198
 199         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 200         if (!tb)
 201                 return -ENOMEM;
 202         tb->buf = p;
 203         tb->release = release;
 204         tb->next = argp->to_free;
 205         argp->to_free = tb;
 206         return 0;
 207 }
 208
 209 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 210 {
 211         if (p == argp->tmp) {
 212                 p = kmalloc(nbytes, GFP_KERNEL);
 213                 if (!p)
 214                         return NULL;
 215                 memcpy(p, argp->tmp, nbytes);
 216         } else {
 217                 BUG_ON(p != argp->tmpp);
 218                 argp->tmpp = NULL;
 219         }
 220         if (defer_free(argp, kfree, p)) {
 221                 kfree(p);
 222                 return NULL;
 223         } else
 224                 return (char *)p;
 225 }
 226
 227 static __be32
 228 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 229 {
 230         u32 bmlen;
 231         DECODE_HEAD;
 232
 233         bmval[0] = 0;
 234         bmval[1] = 0;
 235
 236         READ_BUF(4);
 237         READ32(bmlen);
 238         if (bmlen > 1000)
 239                 goto xdr_error;
 240
 241         READ_BUF(bmlen << 2);
 242         if (bmlen > 0)
 243                 READ32(bmval[0]);
 244         if (bmlen > 1)
 245                 READ32(bmval[1]);
 246
 247         DECODE_TAIL;
 248 }
 249
 250 static __be32
 251 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 252     struct nfs4_acl **acl)
 253 {
 254         int expected_len, len = 0;
 255         u32 dummy32;
 256         char *buf;
 257         int host_err;
 258
 259         DECODE_HEAD;
 260         iattr->ia_valid = 0;
 261         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 262                 return status;
 263
 264         /*
 265          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
 266          * read-only attributes return ERR_INVAL.
 267          */
 268         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 269                 return nfserr_attrnotsupp;
 270         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 271                 return nfserr_inval;
 272
 273         READ_BUF(4);
 274         READ32(expected_len);
 275
 276         if (bmval[0] & FATTR4_WORD0_SIZE) {
 277                 READ_BUF(8);
 278                 len += 8;
 279                 READ64(iattr->ia_size);
 280                 iattr->ia_valid |= ATTR_SIZE;
 281         }
 282         if (bmval[0] & FATTR4_WORD0_ACL) {
 283                 int nace;
 284                 struct nfs4_ace *ace;
 285
 286                 READ_BUF(4); len += 4;
 287                 READ32(nace);
 288
 289                 if (nace > NFS4_ACL_MAX)
 290                         return nfserr_resource;
 291
 292                 *acl = nfs4_acl_new(nace);
 293                 if (*acl == NULL) {
 294                         host_err = -ENOMEM;
 295                         goto out_nfserr;
 296                 }
 297                 defer_free(argp, kfree, *acl);
 298
 299                 (*acl)->naces = nace;
 300                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 301                         READ_BUF(16); len += 16;
 302                         READ32(ace->type);
 303                         READ32(ace->flag);
 304                         READ32(ace->access_mask);
 305                         READ32(dummy32);
 306                         READ_BUF(dummy32);
 307                         len += XDR_QUADLEN(dummy32) << 2;
 308                         READMEM(buf, dummy32);
 309                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 310                         host_err = 0;
 311                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 312                                 ace->who = 0;
 313                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 314                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 315                                                 buf, dummy32, &ace->who);
 316                         else
 317                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 318                                                 buf, dummy32, &ace->who);
 319                         if (host_err)
 320                                 goto out_nfserr;
 321                 }
 322         } else
 323                 *acl = NULL;
 324         if (bmval[1] & FATTR4_WORD1_MODE) {
 325                 READ_BUF(4);
 326                 len += 4;
 327                 READ32(iattr->ia_mode);
 328                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 329                 iattr->ia_valid |= ATTR_MODE;
 330         }
 331         if (bmval[1] & FATTR4_WORD1_OWNER) {
 332                 READ_BUF(4);
 333                 len += 4;
 334                 READ32(dummy32);
 335                 READ_BUF(dummy32);
 336                 len += (XDR_QUADLEN(dummy32) << 2);
 337                 READMEM(buf, dummy32);
 338                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 339                         goto out_nfserr;
 340                 iattr->ia_valid |= ATTR_UID;
 341         }
 342         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 343                 READ_BUF(4);
 344                 len += 4;
 345                 READ32(dummy32);
 346                 READ_BUF(dummy32);
 347                 len += (XDR_QUADLEN(dummy32) << 2);
 348                 READMEM(buf, dummy32);
 349                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 350                         goto out_nfserr;
 351                 iattr->ia_valid |= ATTR_GID;
 352         }
 353         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 354                 READ_BUF(4);
 355                 len += 4;
 356                 READ32(dummy32);
 357                 switch (dummy32) {
 358                 case NFS4_SET_TO_CLIENT_TIME:
 359                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 360                            all 32 bits of 'nseconds'. */
 361                         READ_BUF(12);
 362                         len += 12;
 363                         READ32(dummy32);
 364                         if (dummy32)
 365                                 return nfserr_inval;
 366                         READ32(iattr->ia_atime.tv_sec);
 367                         READ32(iattr->ia_atime.tv_nsec);
 368                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 369                                 return nfserr_inval;
 370                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 371                         break;
 372                 case NFS4_SET_TO_SERVER_TIME:
 373                         iattr->ia_valid |= ATTR_ATIME;
 374                         break;
 375                 default:
 376                         goto xdr_error;
 377                 }
 378         }
 379         if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
 380                 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 381                    all 32 bits of 'nseconds'. */
 382                 READ_BUF(12);
 383                 len += 12;
 384                 READ32(dummy32);
 385                 if (dummy32)
 386                         return nfserr_inval;
 387                 READ32(iattr->ia_ctime.tv_sec);
 388                 READ32(iattr->ia_ctime.tv_nsec);
 389                 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
 390                         return nfserr_inval;
 391                 iattr->ia_valid |= ATTR_CTIME;
 392         }
 393         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 394                 READ_BUF(4);
 395                 len += 4;
 396                 READ32(dummy32);
 397                 switch (dummy32) {
 398                 case NFS4_SET_TO_CLIENT_TIME:
 399                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 400                            all 32 bits of 'nseconds'. */
 401                         READ_BUF(12);
 402                         len += 12;
 403                         READ32(dummy32);
 404                         if (dummy32)
 405                                 return nfserr_inval;
 406                         READ32(iattr->ia_mtime.tv_sec);
 407                         READ32(iattr->ia_mtime.tv_nsec);
 408                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 409                                 return nfserr_inval;
 410                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 411                         break;
 412                 case NFS4_SET_TO_SERVER_TIME:
 413                         iattr->ia_valid |= ATTR_MTIME;
 414                         break;
 415                 default:
 416                         goto xdr_error;
 417                 }
 418         }
 419         if (len != expected_len)
 420                 goto xdr_error;
 421
 422         DECODE_TAIL;
 423
 424 out_nfserr:
 425         status = nfserrno(host_err);
 426         goto out;
 427 }
 428
 429 static __be32
 430 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 431 {
 432         DECODE_HEAD;
 433
 434         READ_BUF(4);
 435         READ32(access->ac_req_access);
 436
 437         DECODE_TAIL;
 438 }
 439
 440 static __be32
 441 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 442 {
 443         DECODE_HEAD;
 444
 445         close->cl_stateowner = NULL;
 446         READ_BUF(4 + sizeof(stateid_t));
 447         READ32(close->cl_seqid);
 448         READ32(close->cl_stateid.si_generation);
 449         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
 450
 451         DECODE_TAIL;
 452 }
 453
 454
 455 static __be32
 456 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 457 {
 458         DECODE_HEAD;
 459
 460         READ_BUF(12);
 461         READ64(commit->co_offset);
 462         READ32(commit->co_count);
 463
 464         DECODE_TAIL;
 465 }
 466
 467 static __be32
 468 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 469 {
 470         DECODE_HEAD;
 471
 472         READ_BUF(4);
 473         READ32(create->cr_type);
 474         switch (create->cr_type) {
 475         case NF4LNK:
 476                 READ_BUF(4);
 477                 READ32(create->cr_linklen);
 478                 READ_BUF(create->cr_linklen);
 479                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 480                 break;
 481         case NF4BLK:
 482         case NF4CHR:
 483                 READ_BUF(8);
 484                 READ32(create->cr_specdata1);
 485                 READ32(create->cr_specdata2);
 486                 break;
 487         case NF4SOCK:
 488         case NF4FIFO:
 489         case NF4DIR:
 490         default:
 491                 break;
 492         }
 493
 494         READ_BUF(4);
 495         READ32(create->cr_namelen);
 496         READ_BUF(create->cr_namelen);
 497         SAVEMEM(create->cr_name, create->cr_namelen);
 498         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 499                 return status;
 500
 501         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 502                 goto out;
 503
 504         DECODE_TAIL;
 505 }
 506
 507 static inline __be32
 508 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 509 {
 510         DECODE_HEAD;
 511
 512         READ_BUF(sizeof(stateid_t));
 513         READ32(dr->dr_stateid.si_generation);
 514         COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
 515
 516         DECODE_TAIL;
 517 }
 518
 519 static inline __be32
 520 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 521 {
 522         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 523 }
 524
 525 static __be32
 526 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 527 {
 528         DECODE_HEAD;
 529
 530         READ_BUF(4);
 531         READ32(link->li_namelen);
 532         READ_BUF(link->li_namelen);
 533         SAVEMEM(link->li_name, link->li_namelen);
 534         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 535                 return status;
 536
 537         DECODE_TAIL;
 538 }
 539
 540 static __be32
 541 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 542 {
 543         DECODE_HEAD;
 544
 545         lock->lk_replay_owner = NULL;
 546         /*
 547         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 548         */
 549         READ_BUF(28);
 550         READ32(lock->lk_type);
 551         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 552                 goto xdr_error;
 553         READ32(lock->lk_reclaim);
 554         READ64(lock->lk_offset);
 555         READ64(lock->lk_length);
 556         READ32(lock->lk_is_new);
 557
 558         if (lock->lk_is_new) {
 559                 READ_BUF(36);
 560                 READ32(lock->lk_new_open_seqid);
 561                 READ32(lock->lk_new_open_stateid.si_generation);
 562
 563                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
 564                 READ32(lock->lk_new_lock_seqid);
 565                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 566                 READ32(lock->lk_new_owner.len);
 567                 READ_BUF(lock->lk_new_owner.len);
 568                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 569         } else {
 570                 READ_BUF(20);
 571                 READ32(lock->lk_old_lock_stateid.si_generation);
 572                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
 573                 READ32(lock->lk_old_lock_seqid);
 574         }
 575
 576         DECODE_TAIL;
 577 }
 578
 579 static __be32
 580 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 581 {
 582         DECODE_HEAD;
 583
 584         READ_BUF(32);
 585         READ32(lockt->lt_type);
 586         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 587                 goto xdr_error;
 588         READ64(lockt->lt_offset);
 589         READ64(lockt->lt_length);
 590         COPYMEM(&lockt->lt_clientid, 8);
 591         READ32(lockt->lt_owner.len);
 592         READ_BUF(lockt->lt_owner.len);
 593         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 594
 595         DECODE_TAIL;
 596 }
 597
 598 static __be32
 599 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 600 {
 601         DECODE_HEAD;
 602
 603         locku->lu_stateowner = NULL;
 604         READ_BUF(24 + sizeof(stateid_t));
 605         READ32(locku->lu_type);
 606         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 607                 goto xdr_error;
 608         READ32(locku->lu_seqid);
 609         READ32(locku->lu_stateid.si_generation);
 610         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
 611         READ64(locku->lu_offset);
 612         READ64(locku->lu_length);
 613
 614         DECODE_TAIL;
 615 }
 616
 617 static __be32
 618 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 619 {
 620         DECODE_HEAD;
 621
 622         READ_BUF(4);
 623         READ32(lookup->lo_len);
 624         READ_BUF(lookup->lo_len);
 625         SAVEMEM(lookup->lo_name, lookup->lo_len);
 626         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 627                 return status;
 628
 629         DECODE_TAIL;
 630 }
 631
 632 static __be32
 633 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 634 {
 635         DECODE_HEAD;
 636
 637         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 638         open->op_iattr.ia_valid = 0;
 639         open->op_stateowner = NULL;
 640
 641         /* seqid, share_access, share_deny, clientid, ownerlen */
 642         READ_BUF(16 + sizeof(clientid_t));
 643         READ32(open->op_seqid);
 644         READ32(open->op_share_access);
 645         READ32(open->op_share_deny);
 646         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 647         READ32(open->op_owner.len);
 648
 649         /* owner, open_flag */
 650         READ_BUF(open->op_owner.len + 4);
 651         SAVEMEM(open->op_owner.data, open->op_owner.len);
 652         READ32(open->op_create);
 653         switch (open->op_create) {
 654         case NFS4_OPEN_NOCREATE:
 655                 break;
 656         case NFS4_OPEN_CREATE:
 657                 READ_BUF(4);
 658                 READ32(open->op_createmode);
 659                 switch (open->op_createmode) {
 660                 case NFS4_CREATE_UNCHECKED:
 661                 case NFS4_CREATE_GUARDED:
 662                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 663                                 goto out;
 664                         break;
 665                 case NFS4_CREATE_EXCLUSIVE:
 666                         READ_BUF(8);
 667                         COPYMEM(open->op_verf.data, 8);
 668                         break;
 669                 default:
 670                         goto xdr_error;
 671                 }
 672                 break;
 673         default:
 674                 goto xdr_error;
 675         }
 676
 677         /* open_claim */
 678         READ_BUF(4);
 679         READ32(open->op_claim_type);
 680         switch (open->op_claim_type) {
 681         case NFS4_OPEN_CLAIM_NULL:
 682         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 683                 READ_BUF(4);
 684                 READ32(open->op_fname.len);
 685                 READ_BUF(open->op_fname.len);
 686                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 687                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 688                         return status;
 689                 break;
 690         case NFS4_OPEN_CLAIM_PREVIOUS:
 691                 READ_BUF(4);
 692                 READ32(open->op_delegate_type);
 693                 break;
 694         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 695                 READ_BUF(sizeof(stateid_t) + 4);
 696                 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
 697                 READ32(open->op_fname.len);
 698                 READ_BUF(open->op_fname.len);
 699                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 700                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 701                         return status;
 702                 break;
 703         default:
 704                 goto xdr_error;
 705         }
 706
 707         DECODE_TAIL;
 708 }
 709
 710 static __be32
 711 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 712 {
 713         DECODE_HEAD;
 714
 715         open_conf->oc_stateowner = NULL;
 716         READ_BUF(4 + sizeof(stateid_t));
 717         READ32(open_conf->oc_req_stateid.si_generation);
 718         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
 719         READ32(open_conf->oc_seqid);
 720
 721         DECODE_TAIL;
 722 }
 723
 724 static __be32
 725 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 726 {
 727         DECODE_HEAD;
 728
 729         open_down->od_stateowner = NULL;
 730         READ_BUF(12 + sizeof(stateid_t));
 731         READ32(open_down->od_stateid.si_generation);
 732         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
 733         READ32(open_down->od_seqid);
 734         READ32(open_down->od_share_access);
 735         READ32(open_down->od_share_deny);
 736
 737         DECODE_TAIL;
 738 }
 739
 740 static __be32
 741 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 742 {
 743         DECODE_HEAD;
 744
 745         READ_BUF(4);
 746         READ32(putfh->pf_fhlen);
 747         if (putfh->pf_fhlen > NFS4_FHSIZE)
 748                 goto xdr_error;
 749         READ_BUF(putfh->pf_fhlen);
 750         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 751
 752         DECODE_TAIL;
 753 }
 754
 755 static __be32
 756 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 757 {
 758         DECODE_HEAD;
 759
 760         READ_BUF(sizeof(stateid_t) + 12);
 761         READ32(read->rd_stateid.si_generation);
 762         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
 763         READ64(read->rd_offset);
 764         READ32(read->rd_length);
 765
 766         DECODE_TAIL;
 767 }
 768
 769 static __be32
 770 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 771 {
 772         DECODE_HEAD;
 773
 774         READ_BUF(24);
 775         READ64(readdir->rd_cookie);
 776         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 777         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 778         READ32(readdir->rd_maxcount);
 779         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 780                 goto out;
 781
 782         DECODE_TAIL;
 783 }
 784
 785 static __be32
 786 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 787 {
 788         DECODE_HEAD;
 789
 790         READ_BUF(4);
 791         READ32(remove->rm_namelen);
 792         READ_BUF(remove->rm_namelen);
 793         SAVEMEM(remove->rm_name, remove->rm_namelen);
 794         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 795                 return status;
 796
 797         DECODE_TAIL;
 798 }
 799
 800 static __be32
 801 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 802 {
 803         DECODE_HEAD;
 804
 805         READ_BUF(4);
 806         READ32(rename->rn_snamelen);
 807         READ_BUF(rename->rn_snamelen + 4);
 808         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 809         READ32(rename->rn_tnamelen);
 810         READ_BUF(rename->rn_tnamelen);
 811         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 812         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 813                 return status;
 814         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 815                 return status;
 816
 817         DECODE_TAIL;
 818 }
 819
 820 static __be32
 821 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 822 {
 823         DECODE_HEAD;
 824
 825         READ_BUF(sizeof(clientid_t));
 826         COPYMEM(clientid, sizeof(clientid_t));
 827
 828         DECODE_TAIL;
 829 }
 830
 831 static __be32
 832 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 833                      struct nfsd4_secinfo *secinfo)
 834 {
 835         DECODE_HEAD;
 836
 837         READ_BUF(4);
 838         READ32(secinfo->si_namelen);
 839         READ_BUF(secinfo->si_namelen);
 840         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 841         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 842                                                                 nfserr_noent);
 843         if (status)
 844                 return status;
 845         DECODE_TAIL;
 846 }
 847
 848 static __be32
 849 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 850 {
 851         DECODE_HEAD;
 852
 853         READ_BUF(sizeof(stateid_t));
 854         READ32(setattr->sa_stateid.si_generation);
 855         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 856         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 857                 goto out;
 858
 859         DECODE_TAIL;
 860 }
 861
 862 static __be32
 863 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 864 {
 865         DECODE_HEAD;
 866
 867         READ_BUF(12);
 868         COPYMEM(setclientid->se_verf.data, 8);
 869         READ32(setclientid->se_namelen);
 870
 871         READ_BUF(setclientid->se_namelen + 8);
 872         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 873         READ32(setclientid->se_callback_prog);
 874         READ32(setclientid->se_callback_netid_len);
 875
 876         READ_BUF(setclientid->se_callback_netid_len + 4);
 877         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 878         READ32(setclientid->se_callback_addr_len);
 879
 880         READ_BUF(setclientid->se_callback_addr_len + 4);
 881         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 882         READ32(setclientid->se_callback_ident);
 883
 884         DECODE_TAIL;
 885 }
 886
 887 static __be32
 888 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 889 {
 890         DECODE_HEAD;
 891
 892         READ_BUF(8 + sizeof(nfs4_verifier));
 893         COPYMEM(&scd_c->sc_clientid, 8);
 894         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 895
 896         DECODE_TAIL;
 897 }
 898
 899 /* Also used for NVERIFY */
 900 static __be32
 901 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 902 {
 903 #if 0
 904         struct nfsd4_compoundargs save = {
 905                 .p = argp->p,
 906                 .end = argp->end,
 907                 .rqstp = argp->rqstp,
 908         };
 909         u32             ve_bmval[2];
 910         struct iattr    ve_iattr;           /* request */
 911         struct nfs4_acl *ve_acl;            /* request */
 912 #endif
 913         DECODE_HEAD;
 914
 915         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 916                 goto out;
 917
 918         /* For convenience's sake, we compare raw xdr'd attributes in
 919          * nfsd4_proc_verify; however we still decode here just to return
 920          * correct error in case of bad xdr. */
 921 #if 0
 922         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 923         if (status == nfserr_inval) {
 924                 status = nfserrno(status);
 925                 goto out;
 926         }
 927 #endif
 928         READ_BUF(4);
 929         READ32(verify->ve_attrlen);
 930         READ_BUF(verify->ve_attrlen);
 931         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 932
 933         DECODE_TAIL;
 934 }
 935
 936 static __be32
 937 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 938 {
 939         int avail;
 940         int v;
 941         int len;
 942         DECODE_HEAD;
 943
 944         READ_BUF(sizeof(stateid_opaque_t) + 20);
 945         READ32(write->wr_stateid.si_generation);
 946         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
 947         READ64(write->wr_offset);
 948         READ32(write->wr_stable_how);
 949         if (write->wr_stable_how > 2)
 950                 goto xdr_error;
 951         READ32(write->wr_buflen);
 952
 953         /* Sorry .. no magic macros for this.. *
 954          * READ_BUF(write->wr_buflen);
 955          * SAVEMEM(write->wr_buf, write->wr_buflen);
 956          */
 957         avail = (char*)argp->end - (char*)argp->p;
 958         if (avail + argp->pagelen < write->wr_buflen) {
 959                 dprintk("NFSD: xdr error (%s:%d)\n",
 960                                 __FILE__, __LINE__);
 961                 goto xdr_error;
 962         }
 963         argp->rqstp->rq_vec[0].iov_base = p;
 964         argp->rqstp->rq_vec[0].iov_len = avail;
 965         v = 0;
 966         len = write->wr_buflen;
 967         while (len > argp->rqstp->rq_vec[v].iov_len) {
 968                 len -= argp->rqstp->rq_vec[v].iov_len;
 969                 v++;
 970                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 971                 argp->pagelist++;
 972                 if (argp->pagelen >= PAGE_SIZE) {
 973                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 974                         argp->pagelen -= PAGE_SIZE;
 975                 } else {
 976                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 977                         argp->pagelen -= len;
 978                 }
 979         }
 980         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 981         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 982         argp->rqstp->rq_vec[v].iov_len = len;
 983         write->wr_vlen = v+1;
 984
 985         DECODE_TAIL;
 986 }
 987
 988 static __be32
 989 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 990 {
 991         DECODE_HEAD;
 992
 993         READ_BUF(12);
 994         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 995         READ32(rlockowner->rl_owner.len);
 996         READ_BUF(rlockowner->rl_owner.len);
 997         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 998
 999         DECODE_TAIL;
1000 }
1001
1002 static __be32
1003 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1004 {
1005         DECODE_HEAD;
1006         struct nfsd4_op *op;
1007         int i;
1008
1009         /*
1010          * XXX: According to spec, we should check the tag
1011          * for UTF-8 compliance.  I'm postponing this for
1012          * now because it seems that some clients do use
1013          * binary tags.
1014          */
1015         READ_BUF(4);
1016         READ32(argp->taglen);
1017         READ_BUF(argp->taglen + 8);
1018         SAVEMEM(argp->tag, argp->taglen);
1019         READ32(argp->minorversion);
1020         READ32(argp->opcnt);
1021
1022         if (argp->taglen > NFSD4_MAX_TAGLEN)
1023                 goto xdr_error;
1024         if (argp->opcnt > 100)
1025                 goto xdr_error;
1026
1027         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1028                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1029                 if (!argp->ops) {
1030                         argp->ops = argp->iops;
1031                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1032                         goto xdr_error;
1033                 }
1034         }
1035
1036         for (i = 0; i < argp->opcnt; i++) {
1037                 op = &argp->ops[i];
1038                 op->replay = NULL;
1039
1040                 /*
1041                  * We can't use READ_BUF() here because we need to handle
1042                  * a missing opcode as an OP_WRITE + 1. So we need to check
1043                  * to see if we're truly at the end of our buffer or if there
1044                  * is another page we need to flip to.
1045                  */
1046
1047                 if (argp->p == argp->end) {
1048                         if (argp->pagelen < 4) {
1049                                 /* There isn't an opcode still on the wire */
1050                                 op->opnum = OP_WRITE + 1;
1051                                 op->status = nfserr_bad_xdr;
1052                                 argp->opcnt = i+1;
1053                                 break;
1054                         }
1055
1056                         /*
1057                          * False alarm. We just hit a page boundary, but there
1058                          * is still data available.  Move pointer across page
1059                          * boundary.  *snip from READ_BUF*
1060                          */
1061                         argp->p = page_address(argp->pagelist[0]);
1062                         argp->pagelist++;
1063                         if (argp->pagelen < PAGE_SIZE) {
1064                                 argp->end = p + (argp->pagelen>>2);
1065                                 argp->pagelen = 0;
1066                         } else {
1067                                 argp->end = p + (PAGE_SIZE>>2);
1068                                 argp->pagelen -= PAGE_SIZE;
1069                         }
1070                 }
1071                 op->opnum = ntohl(*argp->p++);
1072
1073                 switch (op->opnum) {
1074                 case 2: /* Reserved operation */
1075                         op->opnum = OP_ILLEGAL;
1076                         if (argp->minorversion == 0)
1077                                 op->status = nfserr_op_illegal;
1078                         else
1079                                 op->status = nfserr_minor_vers_mismatch;
1080                         break;
1081                 case OP_ACCESS:
1082                         op->status = nfsd4_decode_access(argp, &op->u.access);
1083                         break;
1084                 case OP_CLOSE:
1085                         op->status = nfsd4_decode_close(argp, &op->u.close);
1086                         break;
1087                 case OP_COMMIT:
1088                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1089                         break;
1090                 case OP_CREATE:
1091                         op->status = nfsd4_decode_create(argp, &op->u.create);
1092                         break;
1093                 case OP_DELEGRETURN:
1094                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1095                         break;
1096                 case OP_GETATTR:
1097                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1098                         break;
1099                 case OP_GETFH:
1100                         op->status = nfs_ok;
1101                         break;
1102                 case OP_LINK:
1103                         op->status = nfsd4_decode_link(argp, &op->u.link);
1104                         break;
1105                 case OP_LOCK:
1106                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1107                         break;
1108                 case OP_LOCKT:
1109                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1110                         break;
1111                 case OP_LOCKU:
1112                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1113                         break;
1114                 case OP_LOOKUP:
1115                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1116                         break;
1117                 case OP_LOOKUPP:
1118                         op->status = nfs_ok;
1119                         break;
1120                 case OP_NVERIFY:
1121                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1122                         break;
1123                 case OP_OPEN:
1124                         op->status = nfsd4_decode_open(argp, &op->u.open);
1125                         break;
1126                 case OP_OPEN_CONFIRM:
1127                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1128                         break;
1129                 case OP_OPEN_DOWNGRADE:
1130                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1131                         break;
1132                 case OP_PUTFH:
1133                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1134                         break;
1135                 case OP_PUTROOTFH:
1136                         op->status = nfs_ok;
1137                         break;
1138                 case OP_READ:
1139                         op->status = nfsd4_decode_read(argp, &op->u.read);
1140                         break;
1141                 case OP_READDIR:
1142                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1143                         break;
1144                 case OP_READLINK:
1145                         op->status = nfs_ok;
1146                         break;
1147                 case OP_REMOVE:
1148                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1149                         break;
1150                 case OP_RENAME:
1151                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1152                         break;
1153                 case OP_RESTOREFH:
1154                         op->status = nfs_ok;
1155                         break;
1156                 case OP_RENEW:
1157                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1158                         break;
1159                 case OP_SAVEFH:
1160                         op->status = nfs_ok;
1161                         break;
1162                 case OP_SECINFO:
1163                         op->status = nfsd4_decode_secinfo(argp, &op->u.secinfo);
1164                         break;
1165                 case OP_SETATTR:
1166                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1167                         break;
1168                 case OP_SETCLIENTID:
1169                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1170                         break;
1171                 case OP_SETCLIENTID_CONFIRM:
1172                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1173                         break;
1174                 case OP_VERIFY:
1175                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1176                         break;
1177                 case OP_WRITE:
1178                         op->status = nfsd4_decode_write(argp, &op->u.write);
1179                         break;
1180                 case OP_RELEASE_LOCKOWNER:
1181                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1182                         break;
1183                 default:
1184                         op->opnum = OP_ILLEGAL;
1185                         op->status = nfserr_op_illegal;
1186                         break;
1187                 }
1188
1189                 if (op->status) {
1190                         argp->opcnt = i+1;
1191                         break;
1192                 }
1193         }
1194
1195         DECODE_TAIL;
1196 }
1197 /*
1198  * END OF "GENERIC" DECODE ROUTINES.
1199  */
1200
1201 /*
1202  * START OF "GENERIC" ENCODE ROUTINES.
1203  *   These may look a little ugly since they are imported from a "generic"
1204  * set of XDR encode/decode routines which are intended to be shared by
1205  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1206  *
1207  * If the pain of reading these is too great, it should be a straightforward
1208  * task to translate them into Linux-specific versions which are more
1209  * consistent with the style used in NFSv2/v3...
1210  */
1211 #define ENCODE_HEAD              __be32 *p
1212
1213 #define WRITE32(n)               *p++ = htonl(n)
1214 #define WRITE64(n)               do {                           \
1215         *p++ = htonl((u32)((n) >> 32));                         \
1216         *p++ = htonl((u32)(n));                                 \
1217 } while (0)
1218 #define WRITEMEM(ptr,nbytes)     do {                           \
1219         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1220         memcpy(p, ptr, nbytes);                                 \
1221         p += XDR_QUADLEN(nbytes);                               \
1222 } while (0)
1223 #define WRITECINFO(c)           do {                            \
1224         *p++ = htonl(c.atomic);                                 \
1225         *p++ = htonl(c.before_ctime_sec);                               \
1226         *p++ = htonl(c.before_ctime_nsec);                              \
1227         *p++ = htonl(c.after_ctime_sec);                                \
1228         *p++ = htonl(c.after_ctime_nsec);                               \
1229 } while (0)
1230
1231 #define RESERVE_SPACE(nbytes)   do {                            \
1232         p = resp->p;                                            \
1233         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1234 } while (0)
1235 #define ADJUST_ARGS()           resp->p = p
1236
1237 /*
1238  * Header routine to setup seqid operation replay cache
1239  */
1240 #define ENCODE_SEQID_OP_HEAD                                    \
1241         __be32 *p;                                              \
1242         __be32 *save;                                           \
1243                                                                 \
1244         save = resp->p;
1245
1246 /*
1247  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1248  * is where sequence id's are incremented, and the replay cache is filled.
1249  * Note that we increment sequence id's here, at the last moment, so we're sure
1250  * we know whether the error to be returned is a sequence id mutating error.
1251  */
1252
1253 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1254         if (seqid_mutating_err(nfserr) && stateowner) {         \
1255                 stateowner->so_seqid++;                         \
1256                 stateowner->so_replay.rp_status = nfserr;       \
1257                 stateowner->so_replay.rp_buflen =               \
1258                           (((char *)(resp)->p - (char *)save)); \
1259                 memcpy(stateowner->so_replay.rp_buf, save,      \
1260                         stateowner->so_replay.rp_buflen);       \
1261         } } while (0);
1262
1263 /* Encode as an array of strings the string given with components
1264  * seperated @sep.
1265  */
1266 static __be32 nfsd4_encode_components(char sep, char *components,
1267                                    __be32 **pp, int *buflen)
1268 {
1269         __be32 *p = *pp;
1270         __be32 *countp = p;
1271         int strlen, count=0;
1272         char *str, *end;
1273
1274         dprintk("nfsd4_encode_components(%s)\n", components);
1275         if ((*buflen -= 4) < 0)
1276                 return nfserr_resource;
1277         WRITE32(0); /* We will fill this in with @count later */
1278         end = str = components;
1279         while (*end) {
1280                 for (; *end && (*end != sep); end++)
1281                         ; /* Point to end of component */
1282                 strlen = end - str;
1283                 if (strlen) {
1284                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1285                                 return nfserr_resource;
1286                         WRITE32(strlen);
1287                         WRITEMEM(str, strlen);
1288                         count++;
1289                 }
1290                 else
1291                         end++;
1292                 str = end;
1293         }
1294         *pp = p;
1295         p = countp;
1296         WRITE32(count);
1297         return 0;
1298 }
1299
1300 /*
1301  * encode a location element of a fs_locations structure
1302  */
1303 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1304                                     __be32 **pp, int *buflen)
1305 {
1306         __be32 status;
1307         __be32 *p = *pp;
1308
1309         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1310         if (status)
1311                 return status;
1312         status = nfsd4_encode_components('/', location->path, &p, buflen);
1313         if (status)
1314                 return status;
1315         *pp = p;
1316         return 0;
1317 }
1318
1319 /*
1320  * Return the path to an export point in the pseudo filesystem namespace
1321  * Returned string is safe to use as long as the caller holds a reference
1322  * to @exp.
1323  */
1324 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1325 {
1326         struct svc_fh tmp_fh;
1327         char *path, *rootpath;
1328
1329         fh_init(&tmp_fh, NFS4_FHSIZE);
1330         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1331         if (*stat)
1332                 return NULL;
1333         rootpath = tmp_fh.fh_export->ex_pathname;
1334
1335         path = exp->ex_pathname;
1336
1337         if (strncmp(path, rootpath, strlen(rootpath))) {
1338                 dprintk("nfsd: fs_locations failed;"
1339                         "%s is not contained in %s\n", path, rootpath);
1340                 *stat = nfserr_notsupp;
1341                 return NULL;
1342         }
1343
1344         return path + strlen(rootpath);
1345 }
1346
1347 /*
1348  *  encode a fs_locations structure
1349  */
1350 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1351                                      struct svc_export *exp,
1352                                      __be32 **pp, int *buflen)
1353 {
1354         __be32 status;
1355         int i;
1356         __be32 *p = *pp;
1357         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1358         char *root = nfsd4_path(rqstp, exp, &status);
1359
1360         if (status)
1361                 return status;
1362         status = nfsd4_encode_components('/', root, &p, buflen);
1363         if (status)
1364                 return status;
1365         if ((*buflen -= 4) < 0)
1366                 return nfserr_resource;
1367         WRITE32(fslocs->locations_count);
1368         for (i=0; i<fslocs->locations_count; i++) {
1369                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1370                                                    &p, buflen);
1371                 if (status)
1372                         return status;
1373         }
1374         *pp = p;
1375         return 0;
1376 }
1377
1378 static u32 nfs4_ftypes[16] = {
1379         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1380         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1381         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1382         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1383 };
1384
1385 static __be32
1386 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1387                         __be32 **p, int *buflen)
1388 {
1389         int status;
1390
1391         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1392                 return nfserr_resource;
1393         if (whotype != NFS4_ACL_WHO_NAMED)
1394                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1395         else if (group)
1396                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1397         else
1398                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1399         if (status < 0)
1400                 return nfserrno(status);
1401         *p = xdr_encode_opaque(*p, NULL, status);
1402         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1403         BUG_ON(*buflen < 0);
1404         return 0;
1405 }
1406
1407 static inline __be32
1408 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1409 {
1410         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1411 }
1412
1413 static inline __be32
1414 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1415 {
1416         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1417 }
1418
1419 static inline __be32
1420 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1421                 __be32 **p, int *buflen)
1422 {
1423         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1424 }
1425
1426 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1427                               FATTR4_WORD0_RDATTR_ERROR)
1428 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1429
1430 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1431 {
1432         /* As per referral draft:  */
1433         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1434             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1435                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1436                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1437                         *rdattr_err = NFSERR_MOVED;
1438                 else
1439                         return nfserr_moved;
1440         }
1441         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1442         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1443         return 0;
1444 }
1445
1446 /*
1447  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1448  * ourselves.
1449  *
1450  * @countp is the buffer size in _words_; upon successful return this becomes
1451  * replaced with the number of words written.
1452  */
1453 __be32
1454 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1455                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1456                 struct svc_rqst *rqstp, int ignore_crossmnt)
1457 {
1458         u32 bmval0 = bmval[0];
1459         u32 bmval1 = bmval[1];
1460         struct kstat stat;
1461         struct svc_fh tempfh;
1462         struct kstatfs statfs;
1463         int buflen = *countp << 2;
1464         __be32 *attrlenp;
1465         u32 dummy;
1466         u64 dummy64;
1467         u32 rdattr_err = 0;
1468         __be32 *p = buffer;
1469         __be32 status;
1470         int err;
1471         int aclsupport = 0;
1472         struct nfs4_acl *acl = NULL;
1473
1474         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1475         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1476         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1477
1478         if (exp->ex_fslocs.migrated) {
1479                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1480                 if (status)
1481                         goto out;
1482         }
1483
1484         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1485         if (err)
1486                 goto out_nfserr;
1487         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1488                         FATTR4_WORD0_MAXNAME)) ||
1489             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1490                        FATTR4_WORD1_SPACE_TOTAL))) {
1491                 err = vfs_statfs(dentry, &statfs);
1492                 if (err)
1493                         goto out_nfserr;
1494         }
1495         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1496                 fh_init(&tempfh, NFS4_FHSIZE);
1497                 status = fh_compose(&tempfh, exp, dentry, NULL);
1498                 if (status)
1499                         goto out;
1500                 fhp = &tempfh;
1501         }
1502         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1503                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1504                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1505                 aclsupport = (err == 0);
1506                 if (bmval0 & FATTR4_WORD0_ACL) {
1507                         if (err == -EOPNOTSUPP)
1508                                 bmval0 &= ~FATTR4_WORD0_ACL;
1509                         else if (err == -EINVAL) {
1510                                 status = nfserr_attrnotsupp;
1511                                 goto out;
1512                         } else if (err != 0)
1513                                 goto out_nfserr;
1514                 }
1515         }
1516         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1517                 if (exp->ex_fslocs.locations == NULL) {
1518                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1519                 }
1520         }
1521         if ((buflen -= 16) < 0)
1522                 goto out_resource;
1523
1524         WRITE32(2);
1525         WRITE32(bmval0);
1526         WRITE32(bmval1);
1527         attrlenp = p++;                /* to be backfilled later */
1528
1529         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1530                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1531                 if ((buflen -= 12) < 0)
1532                         goto out_resource;
1533                 if (!aclsupport)
1534                         word0 &= ~FATTR4_WORD0_ACL;
1535                 if (!exp->ex_fslocs.locations)
1536                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1537                 WRITE32(2);
1538                 WRITE32(word0);
1539                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1540         }
1541         if (bmval0 & FATTR4_WORD0_TYPE) {
1542                 if ((buflen -= 4) < 0)
1543                         goto out_resource;
1544                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1545                 if (dummy == NF4BAD)
1546                         goto out_serverfault;
1547                 WRITE32(dummy);
1548         }
1549         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1550                 if ((buflen -= 4) < 0)
1551                         goto out_resource;
1552                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1553                         WRITE32(NFS4_FH_PERSISTENT);
1554                 else
1555                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1556         }
1557         if (bmval0 & FATTR4_WORD0_CHANGE) {
1558                 /*
1559                  * Note: This _must_ be consistent with the scheme for writing
1560                  * change_info, so any changes made here must be reflected there
1561                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1562                  * macro above.)
1563                  */
1564                 if ((buflen -= 8) < 0)
1565                         goto out_resource;
1566                 WRITE32(stat.ctime.tv_sec);
1567                 WRITE32(stat.ctime.tv_nsec);
1568         }
1569         if (bmval0 & FATTR4_WORD0_SIZE) {
1570                 if ((buflen -= 8) < 0)
1571                         goto out_resource;
1572                 WRITE64(stat.size);
1573         }
1574         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1575                 if ((buflen -= 4) < 0)
1576                         goto out_resource;
1577                 WRITE32(1);
1578         }
1579         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1580                 if ((buflen -= 4) < 0)
1581                         goto out_resource;
1582                 WRITE32(1);
1583         }
1584         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1585                 if ((buflen -= 4) < 0)
1586                         goto out_resource;
1587                 WRITE32(0);
1588         }
1589         if (bmval0 & FATTR4_WORD0_FSID) {
1590                 if ((buflen -= 16) < 0)
1591                         goto out_resource;
1592                 if (exp->ex_fslocs.migrated) {
1593                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1594                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1595                 } else switch(fsid_source(fhp)) {
1596                 case FSIDSOURCE_FSID:
1597                         WRITE64((u64)exp->ex_fsid);
1598                         WRITE64((u64)0);
1599                         break;
1600                 case FSIDSOURCE_DEV:
1601                         WRITE32(0);
1602                         WRITE32(MAJOR(stat.dev));
1603                         WRITE32(0);
1604                         WRITE32(MINOR(stat.dev));
1605                         break;
1606                 case FSIDSOURCE_UUID:
1607                         WRITEMEM(exp->ex_uuid, 16);
1608                         break;
1609                 }
1610         }
1611         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1612                 if ((buflen -= 4) < 0)
1613                         goto out_resource;
1614                 WRITE32(0);
1615         }
1616         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1617                 if ((buflen -= 4) < 0)
1618                         goto out_resource;
1619                 WRITE32(NFSD_LEASE_TIME);
1620         }
1621         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1622                 if ((buflen -= 4) < 0)
1623                         goto out_resource;
1624                 WRITE32(rdattr_err);
1625         }
1626         if (bmval0 & FATTR4_WORD0_ACL) {
1627                 struct nfs4_ace *ace;
1628
1629                 if (acl == NULL) {
1630                         if ((buflen -= 4) < 0)
1631                                 goto out_resource;
1632
1633                         WRITE32(0);
1634                         goto out_acl;
1635                 }
1636                 if ((buflen -= 4) < 0)
1637                         goto out_resource;
1638                 WRITE32(acl->naces);
1639
1640                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1641                         if ((buflen -= 4*3) < 0)
1642                                 goto out_resource;
1643                         WRITE32(ace->type);
1644                         WRITE32(ace->flag);
1645                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1646                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1647                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1648                                 &p, &buflen);
1649                         if (status == nfserr_resource)
1650                                 goto out_resource;
1651                         if (status)
1652                                 goto out;
1653                 }
1654         }
1655 out_acl:
1656         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1657                 if ((buflen -= 4) < 0)
1658                         goto out_resource;
1659                 WRITE32(aclsupport ?
1660                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1661         }
1662         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1663                 if ((buflen -= 4) < 0)
1664                         goto out_resource;
1665                 WRITE32(1);
1666         }
1667         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1668                 if ((buflen -= 4) < 0)
1669                         goto out_resource;
1670                 WRITE32(1);
1671         }
1672         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1673                 if ((buflen -= 4) < 0)
1674                         goto out_resource;
1675                 WRITE32(1);
1676         }
1677         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1678                 if ((buflen -= 4) < 0)
1679                         goto out_resource;
1680                 WRITE32(1);
1681         }
1682         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1683                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1684                 if (buflen < 0)
1685                         goto out_resource;
1686                 WRITE32(fhp->fh_handle.fh_size);
1687                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1688         }
1689         if (bmval0 & FATTR4_WORD0_FILEID) {
1690                 if ((buflen -= 8) < 0)
1691                         goto out_resource;
1692                 WRITE64(stat.ino);
1693         }
1694         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1695                 if ((buflen -= 8) < 0)
1696                         goto out_resource;
1697                 WRITE64((u64) statfs.f_ffree);
1698         }
1699         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1700                 if ((buflen -= 8) < 0)
1701                         goto out_resource;
1702                 WRITE64((u64) statfs.f_ffree);
1703         }
1704         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1705                 if ((buflen -= 8) < 0)
1706                         goto out_resource;
1707                 WRITE64((u64) statfs.f_files);
1708         }
1709         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1710                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1711                 if (status == nfserr_resource)
1712                         goto out_resource;
1713                 if (status)
1714                         goto out;
1715         }
1716         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1717                 if ((buflen -= 4) < 0)
1718                         goto out_resource;
1719                 WRITE32(1);
1720         }
1721         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1722                 if ((buflen -= 8) < 0)
1723                         goto out_resource;
1724                 WRITE64(~(u64)0);
1725         }
1726         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1727                 if ((buflen -= 4) < 0)
1728                         goto out_resource;
1729                 WRITE32(255);
1730         }
1731         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1732                 if ((buflen -= 4) < 0)
1733                         goto out_resource;
1734                 WRITE32(statfs.f_namelen);
1735         }
1736         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1737                 if ((buflen -= 8) < 0)
1738                         goto out_resource;
1739                 WRITE64((u64) svc_max_payload(rqstp));
1740         }
1741         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1742                 if ((buflen -= 8) < 0)
1743                         goto out_resource;
1744                 WRITE64((u64) svc_max_payload(rqstp));
1745         }
1746         if (bmval1 & FATTR4_WORD1_MODE) {
1747                 if ((buflen -= 4) < 0)
1748                         goto out_resource;
1749                 WRITE32(stat.mode & S_IALLUGO);
1750         }
1751         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1752                 if ((buflen -= 4) < 0)
1753                         goto out_resource;
1754                 WRITE32(1);
1755         }
1756         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1757                 if ((buflen -= 4) < 0)
1758                         goto out_resource;
1759                 WRITE32(stat.nlink);
1760         }
1761         if (bmval1 & FATTR4_WORD1_OWNER) {
1762                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1763                 if (status == nfserr_resource)
1764                         goto out_resource;
1765                 if (status)
1766                         goto out;
1767         }
1768         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1769                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1770                 if (status == nfserr_resource)
1771                         goto out_resource;
1772                 if (status)
1773                         goto out;
1774         }
1775         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1776                 if ((buflen -= 8) < 0)
1777                         goto out_resource;
1778                 WRITE32((u32) MAJOR(stat.rdev));
1779                 WRITE32((u32) MINOR(stat.rdev));
1780         }
1781         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1782                 if ((buflen -= 8) < 0)
1783                         goto out_resource;
1784                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1785                 WRITE64(dummy64);
1786         }
1787         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1788                 if ((buflen -= 8) < 0)
1789                         goto out_resource;
1790                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1791                 WRITE64(dummy64);
1792         }
1793         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1794                 if ((buflen -= 8) < 0)
1795                         goto out_resource;
1796                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1797                 WRITE64(dummy64);
1798         }
1799         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1800                 if ((buflen -= 8) < 0)
1801                         goto out_resource;
1802                 dummy64 = (u64)stat.blocks << 9;
1803                 WRITE64(dummy64);
1804         }
1805         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1806                 if ((buflen -= 12) < 0)
1807                         goto out_resource;
1808                 WRITE32(0);
1809                 WRITE32(stat.atime.tv_sec);
1810                 WRITE32(stat.atime.tv_nsec);
1811         }
1812         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1813                 if ((buflen -= 12) < 0)
1814                         goto out_resource;
1815                 WRITE32(0);
1816                 WRITE32(1);
1817                 WRITE32(0);
1818         }
1819         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1820                 if ((buflen -= 12) < 0)
1821                         goto out_resource;
1822                 WRITE32(0);
1823                 WRITE32(stat.ctime.tv_sec);
1824                 WRITE32(stat.ctime.tv_nsec);
1825         }
1826         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1827                 if ((buflen -= 12) < 0)
1828                         goto out_resource;
1829                 WRITE32(0);
1830                 WRITE32(stat.mtime.tv_sec);
1831                 WRITE32(stat.mtime.tv_nsec);
1832         }
1833         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1834                 if ((buflen -= 8) < 0)
1835                         goto out_resource;
1836                 /*
1837                  * Get parent's attributes if not ignoring crossmount
1838                  * and this is the root of a cross-mounted filesystem.
1839                  */
1840                 if (ignore_crossmnt == 0 &&
1841                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
1842                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
1843                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
1844                         if (err)
1845                                 goto out_nfserr;
1846                 }
1847                 WRITE64(stat.ino);
1848         }
1849         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1850         *countp = p - buffer;
1851         status = nfs_ok;
1852
1853 out:
1854         kfree(acl);
1855         if (fhp == &tempfh)
1856                 fh_put(&tempfh);
1857         return status;
1858 out_nfserr:
1859         status = nfserrno(err);
1860         goto out;
1861 out_resource:
1862         *countp = 0;
1863         status = nfserr_resource;
1864         goto out;
1865 out_serverfault:
1866         status = nfserr_serverfault;
1867         goto out;
1868 }
1869
1870 static __be32
1871 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1872                 const char *name, int namlen, __be32 *p, int *buflen)
1873 {
1874         struct svc_export *exp = cd->rd_fhp->fh_export;
1875         struct dentry *dentry;
1876         __be32 nfserr;
1877         int ignore_crossmnt = 0;
1878
1879         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1880         if (IS_ERR(dentry))
1881                 return nfserrno(PTR_ERR(dentry));
1882
1883         exp_get(exp);
1884         /*
1885          * In the case of a mountpoint, the client may be asking for
1886          * attributes that are only properties of the underlying filesystem
1887          * as opposed to the cross-mounted file system. In such a case,
1888          * we will not follow the cross mount and will fill the attribtutes
1889          * directly from the mountpoint dentry.
1890          */
1891         if (d_mountpoint(dentry) &&
1892             (cd->rd_bmval[0] & ~FATTR4_WORD0_RDATTR_ERROR) == 0 &&
1893             (cd->rd_bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID) == 0)
1894                 ignore_crossmnt = 1;
1895         else if (d_mountpoint(dentry)) {
1896                 int err;
1897
1898                 /*
1899                  * Why the heck aren't we just using nfsd_lookup??
1900                  * Different "."/".." handling?  Something else?
1901                  * At least, add a comment here to explain....
1902                  */
1903                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1904                 if (err) {
1905                         nfserr = nfserrno(err);
1906                         goto out_put;
1907                 }
1908                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
1909                 if (nfserr)
1910                         goto out_put;
1911
1912         }
1913         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1914                                         cd->rd_rqstp, ignore_crossmnt);
1915 out_put:
1916         dput(dentry);
1917         exp_put(exp);
1918         return nfserr;
1919 }
1920
1921 static __be32 *
1922 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1923 {
1924         __be32 *attrlenp;
1925
1926         if (buflen < 6)
1927                 return NULL;
1928         *p++ = htonl(2);
1929         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1930         *p++ = htonl(0);                         /* bmval1 */
1931
1932         attrlenp = p++;
1933         *p++ = nfserr;       /* no htonl */
1934         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1935         return p;
1936 }
1937
1938 static int
1939 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1940                     loff_t offset, u64 ino, unsigned int d_type)
1941 {
1942         struct readdir_cd *ccd = ccdv;
1943         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1944         int buflen;
1945         __be32 *p = cd->buffer;
1946         __be32 nfserr = nfserr_toosmall;
1947
1948         /* In nfsv4, "." and ".." never make it onto the wire.. */
1949         if (name && isdotent(name, namlen)) {
1950                 cd->common.err = nfs_ok;
1951                 return 0;
1952         }
1953
1954         if (cd->offset)
1955                 xdr_encode_hyper(cd->offset, (u64) offset);
1956
1957         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1958         if (buflen < 0)
1959                 goto fail;
1960
1961         *p++ = xdr_one;                             /* mark entry present */
1962         cd->offset = p;                             /* remember pointer */
1963         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1964         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1965
1966         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1967         switch (nfserr) {
1968         case nfs_ok:
1969                 p += buflen;
1970                 break;
1971         case nfserr_resource:
1972                 nfserr = nfserr_toosmall;
1973                 goto fail;
1974         case nfserr_dropit:
1975                 goto fail;
1976         default:
1977                 /*
1978                  * If the client requested the RDATTR_ERROR attribute,
1979                  * we stuff the error code into this attribute
1980                  * and continue.  If this attribute was not requested,
1981                  * then in accordance with the spec, we fail the
1982                  * entire READDIR operation(!)
1983                  */
1984                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1985                         goto fail;
1986                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1987                 if (p == NULL) {
1988                         nfserr = nfserr_toosmall;
1989                         goto fail;
1990                 }
1991         }
1992         cd->buflen -= (p - cd->buffer);
1993         cd->buffer = p;
1994         cd->common.err = nfs_ok;
1995         return 0;
1996 fail:
1997         cd->common.err = nfserr;
1998         return -EINVAL;
1999 }
2000
2001 static void
2002 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2003 {
2004         ENCODE_HEAD;
2005
2006         if (!nfserr) {
2007                 RESERVE_SPACE(8);
2008                 WRITE32(access->ac_supported);
2009                 WRITE32(access->ac_resp_access);
2010                 ADJUST_ARGS();
2011         }
2012 }
2013
2014 static void
2015 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2016 {
2017         ENCODE_SEQID_OP_HEAD;
2018
2019         if (!nfserr) {
2020                 RESERVE_SPACE(sizeof(stateid_t));
2021                 WRITE32(close->cl_stateid.si_generation);
2022                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
2023                 ADJUST_ARGS();
2024         }
2025         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2026 }
2027
2028
2029 static void
2030 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2031 {
2032         ENCODE_HEAD;
2033
2034         if (!nfserr) {
2035                 RESERVE_SPACE(8);
2036                 WRITEMEM(commit->co_verf.data, 8);
2037                 ADJUST_ARGS();
2038         }
2039 }
2040
2041 static void
2042 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2043 {
2044         ENCODE_HEAD;
2045
2046         if (!nfserr) {
2047                 RESERVE_SPACE(32);
2048                 WRITECINFO(create->cr_cinfo);
2049                 WRITE32(2);
2050                 WRITE32(create->cr_bmval[0]);
2051                 WRITE32(create->cr_bmval[1]);
2052                 ADJUST_ARGS();
2053         }
2054 }
2055
2056 static __be32
2057 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2058 {
2059         struct svc_fh *fhp = getattr->ga_fhp;
2060         int buflen;
2061
2062         if (nfserr)
2063                 return nfserr;
2064
2065         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2066         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2067                                     resp->p, &buflen, getattr->ga_bmval,
2068                                     resp->rqstp, 0);
2069         if (!nfserr)
2070                 resp->p += buflen;
2071         return nfserr;
2072 }
2073
2074 static void
2075 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh *fhp)
2076 {
2077         unsigned int len;
2078         ENCODE_HEAD;
2079
2080         if (!nfserr) {
2081                 len = fhp->fh_handle.fh_size;
2082                 RESERVE_SPACE(len + 4);
2083                 WRITE32(len);
2084                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2085                 ADJUST_ARGS();
2086         }
2087 }
2088
2089 /*
2090 * Including all fields other than the name, a LOCK4denied structure requires
2091 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2092 */
2093 static void
2094 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2095 {
2096         ENCODE_HEAD;
2097
2098         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2099         WRITE64(ld->ld_start);
2100         WRITE64(ld->ld_length);
2101         WRITE32(ld->ld_type);
2102         if (ld->ld_sop) {
2103                 WRITEMEM(&ld->ld_clientid, 8);
2104                 WRITE32(ld->ld_sop->so_owner.len);
2105                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2106                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2107         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2108                 WRITE64((u64)0); /* clientid */
2109                 WRITE32(0); /* length of owner name */
2110         }
2111         ADJUST_ARGS();
2112 }
2113
2114 static void
2115 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2116 {
2117         ENCODE_SEQID_OP_HEAD;
2118
2119         if (!nfserr) {
2120                 RESERVE_SPACE(4 + sizeof(stateid_t));
2121                 WRITE32(lock->lk_resp_stateid.si_generation);
2122                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2123                 ADJUST_ARGS();
2124         } else if (nfserr == nfserr_denied)
2125                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2126
2127         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2128 }
2129
2130 static void
2131 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2132 {
2133         if (nfserr == nfserr_denied)
2134                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2135 }
2136
2137 static void
2138 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2139 {
2140         ENCODE_SEQID_OP_HEAD;
2141
2142         if (!nfserr) {
2143                 RESERVE_SPACE(sizeof(stateid_t));
2144                 WRITE32(locku->lu_stateid.si_generation);
2145                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2146                 ADJUST_ARGS();
2147         }
2148
2149         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2150 }
2151
2152
2153 static void
2154 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2155 {
2156         ENCODE_HEAD;
2157
2158         if (!nfserr) {
2159                 RESERVE_SPACE(20);
2160                 WRITECINFO(link->li_cinfo);
2161                 ADJUST_ARGS();
2162         }
2163 }
2164
2165
2166 static void
2167 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2168 {
2169         ENCODE_SEQID_OP_HEAD;
2170
2171         if (nfserr)
2172                 goto out;
2173
2174         RESERVE_SPACE(36 + sizeof(stateid_t));
2175         WRITE32(open->op_stateid.si_generation);
2176         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2177         WRITECINFO(open->op_cinfo);
2178         WRITE32(open->op_rflags);
2179         WRITE32(2);
2180         WRITE32(open->op_bmval[0]);
2181         WRITE32(open->op_bmval[1]);
2182         WRITE32(open->op_delegate_type);
2183         ADJUST_ARGS();
2184
2185         switch (open->op_delegate_type) {
2186         case NFS4_OPEN_DELEGATE_NONE:
2187                 break;
2188         case NFS4_OPEN_DELEGATE_READ:
2189                 RESERVE_SPACE(20 + sizeof(stateid_t));
2190                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2191                 WRITE32(open->op_recall);
2192
2193                 /*
2194                  * TODO: ACE's in delegations
2195                  */
2196                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2197                 WRITE32(0);
2198                 WRITE32(0);
2199                 WRITE32(0);   /* XXX: is NULL principal ok? */
2200                 ADJUST_ARGS();
2201                 break;
2202         case NFS4_OPEN_DELEGATE_WRITE:
2203                 RESERVE_SPACE(32 + sizeof(stateid_t));
2204                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2205                 WRITE32(0);
2206
2207                 /*
2208                  * TODO: space_limit's in delegations
2209                  */
2210                 WRITE32(NFS4_LIMIT_SIZE);
2211                 WRITE32(~(u32)0);
2212                 WRITE32(~(u32)0);
2213
2214                 /*
2215                  * TODO: ACE's in delegations
2216                  */
2217                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2218                 WRITE32(0);
2219                 WRITE32(0);
2220                 WRITE32(0);   /* XXX: is NULL principal ok? */
2221                 ADJUST_ARGS();
2222                 break;
2223         default:
2224                 BUG();
2225         }
2226         /* XXX save filehandle here */
2227 out:
2228         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2229 }
2230
2231 static void
2232 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2233 {
2234         ENCODE_SEQID_OP_HEAD;
2235
2236         if (!nfserr) {
2237                 RESERVE_SPACE(sizeof(stateid_t));
2238                 WRITE32(oc->oc_resp_stateid.si_generation);
2239                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2240                 ADJUST_ARGS();
2241         }
2242
2243         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2244 }
2245
2246 static void
2247 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2248 {
2249         ENCODE_SEQID_OP_HEAD;
2250
2251         if (!nfserr) {
2252                 RESERVE_SPACE(sizeof(stateid_t));
2253                 WRITE32(od->od_stateid.si_generation);
2254                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2255                 ADJUST_ARGS();
2256         }
2257
2258         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2259 }
2260
2261 static __be32
2262 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2263                   struct nfsd4_read *read)
2264 {
2265         u32 eof;
2266         int v, pn;
2267         unsigned long maxcount;
2268         long len;
2269         ENCODE_HEAD;
2270
2271         if (nfserr)
2272                 return nfserr;
2273         if (resp->xbuf->page_len)
2274                 return nfserr_resource;
2275
2276         RESERVE_SPACE(8); /* eof flag and byte count */
2277
2278         maxcount = svc_max_payload(resp->rqstp);
2279         if (maxcount > read->rd_length)
2280                 maxcount = read->rd_length;
2281
2282         len = maxcount;
2283         v = 0;
2284         while (len > 0) {
2285                 pn = resp->rqstp->rq_resused++;
2286                 resp->rqstp->rq_vec[v].iov_base =
2287                         page_address(resp->rqstp->rq_respages[pn]);
2288                 resp->rqstp->rq_vec[v].iov_len =
2289                         len < PAGE_SIZE ? len : PAGE_SIZE;
2290                 v++;
2291                 len -= PAGE_SIZE;
2292         }
2293         read->rd_vlen = v;
2294
2295         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2296                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2297                         &maxcount);
2298
2299         if (nfserr == nfserr_symlink)
2300                 nfserr = nfserr_inval;
2301         if (nfserr)
2302                 return nfserr;
2303         eof = (read->rd_offset + maxcount >=
2304                read->rd_fhp->fh_dentry->d_inode->i_size);
2305
2306         WRITE32(eof);
2307         WRITE32(maxcount);
2308         ADJUST_ARGS();
2309         resp->xbuf->head[0].iov_len = (char*)p
2310                                         - (char*)resp->xbuf->head[0].iov_base;
2311         resp->xbuf->page_len = maxcount;
2312
2313         /* Use rest of head for padding and remaining ops: */
2314         resp->xbuf->tail[0].iov_base = p;
2315         resp->xbuf->tail[0].iov_len = 0;
2316         if (maxcount&3) {
2317                 RESERVE_SPACE(4);
2318                 WRITE32(0);
2319                 resp->xbuf->tail[0].iov_base += maxcount&3;
2320                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2321                 ADJUST_ARGS();
2322         }
2323         return 0;
2324 }
2325
2326 static __be32
2327 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2328 {
2329         int maxcount;
2330         char *page;
2331         ENCODE_HEAD;
2332
2333         if (nfserr)
2334                 return nfserr;
2335         if (resp->xbuf->page_len)
2336                 return nfserr_resource;
2337
2338         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2339
2340         maxcount = PAGE_SIZE;
2341         RESERVE_SPACE(4);
2342
2343         /*
2344          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2345          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2346          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2347          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2348          */
2349         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2350         if (nfserr == nfserr_isdir)
2351                 return nfserr_inval;
2352         if (nfserr)
2353                 return nfserr;
2354
2355         WRITE32(maxcount);
2356         ADJUST_ARGS();
2357         resp->xbuf->head[0].iov_len = (char*)p
2358                                 - (char*)resp->xbuf->head[0].iov_base;
2359         resp->xbuf->page_len = maxcount;
2360
2361         /* Use rest of head for padding and remaining ops: */
2362         resp->xbuf->tail[0].iov_base = p;
2363         resp->xbuf->tail[0].iov_len = 0;
2364         if (maxcount&3) {
2365                 RESERVE_SPACE(4);
2366                 WRITE32(0);
2367                 resp->xbuf->tail[0].iov_base += maxcount&3;
2368                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2369                 ADJUST_ARGS();
2370         }
2371         return 0;
2372 }
2373
2374 static __be32
2375 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2376 {
2377         int maxcount;
2378         loff_t offset;
2379         __be32 *page, *savep, *tailbase;
2380         ENCODE_HEAD;
2381
2382         if (nfserr)
2383                 return nfserr;
2384         if (resp->xbuf->page_len)
2385                 return nfserr_resource;
2386
2387         RESERVE_SPACE(8);  /* verifier */
2388         savep = p;
2389
2390         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2391         WRITE32(0);
2392         WRITE32(0);
2393         ADJUST_ARGS();
2394         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2395         tailbase = p;
2396
2397         maxcount = PAGE_SIZE;
2398         if (maxcount > readdir->rd_maxcount)
2399                 maxcount = readdir->rd_maxcount;
2400
2401         /*
2402          * Convert from bytes to words, account for the two words already
2403          * written, make sure to leave two words at the end for the next
2404          * pointer and eof field.
2405          */
2406         maxcount = (maxcount >> 2) - 4;
2407         if (maxcount < 0) {
2408                 nfserr =  nfserr_toosmall;
2409                 goto err_no_verf;
2410         }
2411
2412         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2413         readdir->common.err = 0;
2414         readdir->buflen = maxcount;
2415         readdir->buffer = page;
2416         readdir->offset = NULL;
2417
2418         offset = readdir->rd_cookie;
2419         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2420                               &offset,
2421                               &readdir->common, nfsd4_encode_dirent);
2422         if (nfserr == nfs_ok &&
2423             readdir->common.err == nfserr_toosmall &&
2424             readdir->buffer == page)
2425                 nfserr = nfserr_toosmall;
2426         if (nfserr == nfserr_symlink)
2427                 nfserr = nfserr_notdir;
2428         if (nfserr)
2429                 goto err_no_verf;
2430
2431         if (readdir->offset)
2432                 xdr_encode_hyper(readdir->offset, offset);
2433
2434         p = readdir->buffer;
2435         *p++ = 0;       /* no more entries */
2436         *p++ = htonl(readdir->common.err == nfserr_eof);
2437         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2438                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2439
2440         /* Use rest of head for padding and remaining ops: */
2441         resp->xbuf->tail[0].iov_base = tailbase;
2442         resp->xbuf->tail[0].iov_len = 0;
2443         resp->p = resp->xbuf->tail[0].iov_base;
2444         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2445
2446         return 0;
2447 err_no_verf:
2448         p = savep;
2449         ADJUST_ARGS();
2450         return nfserr;
2451 }
2452
2453 static void
2454 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2455 {
2456         ENCODE_HEAD;
2457
2458         if (!nfserr) {
2459                 RESERVE_SPACE(20);
2460                 WRITECINFO(remove->rm_cinfo);
2461                 ADJUST_ARGS();
2462         }
2463 }
2464
2465 static void
2466 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2467 {
2468         ENCODE_HEAD;
2469
2470         if (!nfserr) {
2471                 RESERVE_SPACE(40);
2472                 WRITECINFO(rename->rn_sinfo);
2473                 WRITECINFO(rename->rn_tinfo);
2474                 ADJUST_ARGS();
2475         }
2476 }
2477
2478 static void
2479 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2480                      struct nfsd4_secinfo *secinfo)
2481 {
2482         int i = 0;
2483         struct svc_export *exp = secinfo->si_exp;
2484         u32 nflavs;
2485         struct exp_flavor_info *flavs;
2486         struct exp_flavor_info def_flavs[2];
2487         ENCODE_HEAD;
2488
2489         if (nfserr)
2490                 goto out;
2491         if (exp->ex_nflavors) {
2492                 flavs = exp->ex_flavors;
2493                 nflavs = exp->ex_nflavors;
2494         } else { /* Handling of some defaults in absence of real secinfo: */
2495                 flavs = def_flavs;
2496                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2497                         nflavs = 2;
2498                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2499                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2500                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2501                         nflavs = 1;
2502                         flavs[0].pseudoflavor
2503                                         = svcauth_gss_flavor(exp->ex_client);
2504                 } else {
2505                         nflavs = 1;
2506                         flavs[0].pseudoflavor
2507                                         = exp->ex_client->flavour->flavour;
2508                 }
2509         }
2510
2511         RESERVE_SPACE(4);
2512         WRITE32(nflavs);
2513         ADJUST_ARGS();
2514         for (i = 0; i < nflavs; i++) {
2515                 u32 flav = flavs[i].pseudoflavor;
2516                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2517
2518                 if (gm) {
2519                         RESERVE_SPACE(4);
2520                         WRITE32(RPC_AUTH_GSS);
2521                         ADJUST_ARGS();
2522                         RESERVE_SPACE(4 + gm->gm_oid.len);
2523                         WRITE32(gm->gm_oid.len);
2524                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2525                         ADJUST_ARGS();
2526                         RESERVE_SPACE(4);
2527                         WRITE32(0); /* qop */
2528                         ADJUST_ARGS();
2529                         RESERVE_SPACE(4);
2530                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2531                         ADJUST_ARGS();
2532                         gss_mech_put(gm);
2533                 } else {
2534                         RESERVE_SPACE(4);
2535                         WRITE32(flav);
2536                         ADJUST_ARGS();
2537                 }
2538         }
2539 out:
2540         if (exp)
2541                 exp_put(exp);
2542 }
2543
2544 /*
2545  * The SETATTR encode routine is special -- it always encodes a bitmap,
2546  * regardless of the error status.
2547  */
2548 static void
2549 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2550 {
2551         ENCODE_HEAD;
2552
2553         RESERVE_SPACE(12);
2554         if (nfserr) {
2555                 WRITE32(2);
2556                 WRITE32(0);
2557                 WRITE32(0);
2558         }
2559         else {
2560                 WRITE32(2);
2561                 WRITE32(setattr->sa_bmval[0]);
2562                 WRITE32(setattr->sa_bmval[1]);
2563         }
2564         ADJUST_ARGS();
2565 }
2566
2567 static void
2568 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2569 {
2570         ENCODE_HEAD;
2571
2572         if (!nfserr) {
2573                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2574                 WRITEMEM(&scd->se_clientid, 8);
2575                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2576                 ADJUST_ARGS();
2577         }
2578         else if (nfserr == nfserr_clid_inuse) {
2579                 RESERVE_SPACE(8);
2580                 WRITE32(0);
2581                 WRITE32(0);
2582                 ADJUST_ARGS();
2583         }
2584 }
2585
2586 static void
2587 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2588 {
2589         ENCODE_HEAD;
2590
2591         if (!nfserr) {
2592                 RESERVE_SPACE(16);
2593                 WRITE32(write->wr_bytes_written);
2594                 WRITE32(write->wr_how_written);
2595                 WRITEMEM(write->wr_verifier.data, 8);
2596                 ADJUST_ARGS();
2597         }
2598 }
2599
2600 void
2601 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2602 {
2603         __be32 *statp;
2604         ENCODE_HEAD;
2605
2606         RESERVE_SPACE(8);
2607         WRITE32(op->opnum);
2608         statp = p++;    /* to be backfilled at the end */
2609         ADJUST_ARGS();
2610
2611         switch (op->opnum) {
2612         case OP_ACCESS:
2613                 nfsd4_encode_access(resp, op->status, &op->u.access);
2614                 break;
2615         case OP_CLOSE:
2616                 nfsd4_encode_close(resp, op->status, &op->u.close);
2617                 break;
2618         case OP_COMMIT:
2619                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2620                 break;
2621         case OP_CREATE:
2622                 nfsd4_encode_create(resp, op->status, &op->u.create);
2623                 break;
2624         case OP_DELEGRETURN:
2625                 break;
2626         case OP_GETATTR:
2627                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2628                 break;
2629         case OP_GETFH:
2630                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2631                 break;
2632         case OP_LINK:
2633                 nfsd4_encode_link(resp, op->status, &op->u.link);
2634                 break;
2635         case OP_LOCK:
2636                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2637                 break;
2638         case OP_LOCKT:
2639                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2640                 break;
2641         case OP_LOCKU:
2642                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2643                 break;
2644         case OP_LOOKUP:
2645                 break;
2646         case OP_LOOKUPP:
2647                 break;
2648         case OP_NVERIFY:
2649                 break;
2650         case OP_OPEN:
2651                 nfsd4_encode_open(resp, op->status, &op->u.open);
2652                 break;
2653         case OP_OPEN_CONFIRM:
2654                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2655                 break;
2656         case OP_OPEN_DOWNGRADE:
2657                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2658                 break;
2659         case OP_PUTFH:
2660                 break;
2661         case OP_PUTROOTFH:
2662                 break;
2663         case OP_READ:
2664                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2665                 break;
2666         case OP_READDIR:
2667                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2668                 break;
2669         case OP_READLINK:
2670                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2671                 break;
2672         case OP_REMOVE:
2673                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2674                 break;
2675         case OP_RENAME:
2676                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2677                 break;
2678         case OP_RENEW:
2679                 break;
2680         case OP_RESTOREFH:
2681                 break;
2682         case OP_SAVEFH:
2683                 break;
2684         case OP_SECINFO:
2685                 nfsd4_encode_secinfo(resp, op->status, &op->u.secinfo);
2686                 break;
2687         case OP_SETATTR:
2688                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2689                 break;
2690         case OP_SETCLIENTID:
2691                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2692                 break;
2693         case OP_SETCLIENTID_CONFIRM:
2694                 break;
2695         case OP_VERIFY:
2696                 break;
2697         case OP_WRITE:
2698                 nfsd4_encode_write(resp, op->status, &op->u.write);
2699                 break;
2700         case OP_RELEASE_LOCKOWNER:
2701                 break;
2702         default:
2703                 break;
2704         }
2705
2706         /*
2707          * Note: We write the status directly, instead of using WRITE32(),
2708          * since it is already in network byte order.
2709          */
2710         *statp = op->status;
2711 }
2712
2713 /*
2714  * Encode the reply stored in the stateowner reply cache
2715  *
2716  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2717  * previously sent already encoded operation.
2718  *
2719  * called with nfs4_lock_state() held
2720  */
2721 void
2722 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2723 {
2724         ENCODE_HEAD;
2725         struct nfs4_replay *rp = op->replay;
2726
2727         BUG_ON(!rp);
2728
2729         RESERVE_SPACE(8);
2730         WRITE32(op->opnum);
2731         *p++ = rp->rp_status;  /* already xdr'ed */
2732         ADJUST_ARGS();
2733
2734         RESERVE_SPACE(rp->rp_buflen);
2735         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2736         ADJUST_ARGS();
2737 }
2738
2739 /*
2740  * END OF "GENERIC" ENCODE ROUTINES.
2741  */
2742
2743 int
2744 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2745 {
2746         return xdr_ressize_check(rqstp, p);
2747 }
2748
2749 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2750 {
2751         if (args->ops != args->iops) {
2752                 kfree(args->ops);
2753                 args->ops = args->iops;
2754         }
2755         kfree(args->tmpp);
2756         args->tmpp = NULL;
2757         while (args->to_free) {
2758                 struct tmpbuf *tb = args->to_free;
2759                 args->to_free = tb->next;
2760                 tb->release(tb->buf);
2761                 kfree(tb);
2762         }
2763 }
2764
2765 int
2766 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2767 {
2768         __be32 status;
2769
2770         args->p = p;
2771         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2772         args->pagelist = rqstp->rq_arg.pages;
2773         args->pagelen = rqstp->rq_arg.page_len;
2774         args->tmpp = NULL;
2775         args->to_free = NULL;
2776         args->ops = args->iops;
2777         args->rqstp = rqstp;
2778
2779         status = nfsd4_decode_compound(args);
2780         if (status) {
2781                 nfsd4_release_compoundargs(args);
2782         }
2783         return !status;
2784 }
2785
2786 int
2787 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2788 {
2789         /*
2790          * All that remains is to write the tag and operation count...
2791          */
2792         struct kvec *iov;
2793         p = resp->tagp;
2794         *p++ = htonl(resp->taglen);
2795         memcpy(p, resp->tag, resp->taglen);
2796         p += XDR_QUADLEN(resp->taglen);
2797         *p++ = htonl(resp->opcnt);
2798
2799         if (rqstp->rq_res.page_len)
2800                 iov = &rqstp->rq_res.tail[0];
2801         else
2802                 iov = &rqstp->rq_res.head[0];
2803         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2804         BUG_ON(iov->iov_len > PAGE_SIZE);
2805         return 1;
2806 }
2807
2808 /*
2809  * Local variables:
2810  *  c-basic-offset: 8
2811  * End:
2812  */