fs/nfsd/nfs4xdr.c

   1 /*
   2  *  fs/nfs/nfs4xdr.c
   3  *
   4  *  Server-side XDR for NFSv4
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * TODO: Neil Brown made the following observation:  We currently
  38  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  39  * never release any of that until the request is complete.
  40  * It would be good to calculate a new maximum response size while
  41  * decoding the COMPOUND, and call svc_reserve with this number
  42  * at the end of nfs4svc_decode_compoundargs.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/smp.h>
  47 #include <linux/smp_lock.h>
  48 #include <linux/fs.h>
  49 #include <linux/namei.h>
  50 #include <linux/vfs.h>
  51 #include <linux/sunrpc/xdr.h>
  52 #include <linux/sunrpc/svc.h>
  53 #include <linux/sunrpc/clnt.h>
  54 #include <linux/nfsd/nfsd.h>
  55 #include <linux/nfsd/state.h>
  56 #include <linux/nfsd/xdr4.h>
  57 #include <linux/nfsd_idmap.h>
  58 #include <linux/nfs4.h>
  59 #include <linux/nfs4_acl.h>
  60 #include <linux/vs_tag.h>
  61
  62 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  63
  64 /*
  65  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  66  * directory in order to indicate to the client that a filesystem boundary is present
  67  * We use a fixed fsid for a referral
  68  */
  69 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  70 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  71
  72 static __be32
  73 check_filename(char *str, int len, __be32 err)
  74 {
  75         int i;
  76
  77         if (len == 0)
  78                 return nfserr_inval;
  79         if (isdotent(str, len))
  80                 return err;
  81         for (i = 0; i < len; i++)
  82                 if (str[i] == '/')
  83                         return err;
  84         return 0;
  85 }
  86
  87 /*
  88  * START OF "GENERIC" DECODE ROUTINES.
  89  *   These may look a little ugly since they are imported from a "generic"
  90  * set of XDR encode/decode routines which are intended to be shared by
  91  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
  92  *
  93  * If the pain of reading these is too great, it should be a straightforward
  94  * task to translate them into Linux-specific versions which are more
  95  * consistent with the style used in NFSv2/v3...
  96  */
  97 #define DECODE_HEAD                             \
  98         __be32 *p;                              \
  99         __be32 status
 100 #define DECODE_TAIL                             \
 101         status = 0;                             \
 102 out:                                            \
 103         return status;                          \
 104 xdr_error:                                      \
 105         printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 106         status = nfserr_bad_xdr;                \
 107         goto out
 108
 109 #define READ32(x)         (x) = ntohl(*p++)
 110 #define READ64(x)         do {                  \
 111         (x) = (u64)ntohl(*p++) << 32;           \
 112         (x) |= ntohl(*p++);                     \
 113 } while (0)
 114 #define READTIME(x)       do {                  \
 115         p++;                                    \
 116         (x) = ntohl(*p++);                      \
 117         p++;                                    \
 118 } while (0)
 119 #define READMEM(x,nbytes) do {                  \
 120         x = (char *)p;                          \
 121         p += XDR_QUADLEN(nbytes);               \
 122 } while (0)
 123 #define SAVEMEM(x,nbytes) do {                  \
 124         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 125                 savemem(argp, p, nbytes) :      \
 126                 (char *)p)) {                   \
 127                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 128                 goto xdr_error;                 \
 129                 }                               \
 130         p += XDR_QUADLEN(nbytes);               \
 131 } while (0)
 132 #define COPYMEM(x,nbytes) do {                  \
 133         memcpy((x), p, nbytes);                 \
 134         p += XDR_QUADLEN(nbytes);               \
 135 } while (0)
 136
 137 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 138 #define READ_BUF(nbytes)  do {                  \
 139         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 140                 p = argp->p;                    \
 141                 argp->p += XDR_QUADLEN(nbytes); \
 142         } else if (!(p = read_buf(argp, nbytes))) { \
 143                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 144                 goto xdr_error;                 \
 145         }                                       \
 146 } while (0)
 147
 148 static __be32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
 149 {
 150         /* We want more bytes than seem to be available.
 151          * Maybe we need a new page, maybe we have just run out
 152          */
 153         int avail = (char*)argp->end - (char*)argp->p;
 154         __be32 *p;
 155         if (avail + argp->pagelen < nbytes)
 156                 return NULL;
 157         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 158                 return NULL;
 159         /* ok, we can do it with the current plus the next page */
 160         if (nbytes <= sizeof(argp->tmp))
 161                 p = argp->tmp;
 162         else {
 163                 kfree(argp->tmpp);
 164                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 165                 if (!p)
 166                         return NULL;
 167
 168         }
 169         memcpy(p, argp->p, avail);
 170         /* step to next page */
 171         argp->p = page_address(argp->pagelist[0]);
 172         argp->pagelist++;
 173         if (argp->pagelen < PAGE_SIZE) {
 174                 argp->end = p + (argp->pagelen>>2);
 175                 argp->pagelen = 0;
 176         } else {
 177                 argp->end = p + (PAGE_SIZE>>2);
 178                 argp->pagelen -= PAGE_SIZE;
 179         }
 180         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 181         argp->p += XDR_QUADLEN(nbytes - avail);
 182         return p;
 183 }
 184
 185 static int
 186 defer_free(struct nfsd4_compoundargs *argp,
 187                 void (*release)(const void *), void *p)
 188 {
 189         struct tmpbuf *tb;
 190
 191         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 192         if (!tb)
 193                 return -ENOMEM;
 194         tb->buf = p;
 195         tb->release = release;
 196         tb->next = argp->to_free;
 197         argp->to_free = tb;
 198         return 0;
 199 }
 200
 201 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 202 {
 203         void *new = NULL;
 204         if (p == argp->tmp) {
 205                 new = kmalloc(nbytes, GFP_KERNEL);
 206                 if (!new) return NULL;
 207                 p = new;
 208                 memcpy(p, argp->tmp, nbytes);
 209         } else {
 210                 BUG_ON(p != argp->tmpp);
 211                 argp->tmpp = NULL;
 212         }
 213         if (defer_free(argp, kfree, p)) {
 214                 kfree(new);
 215                 return NULL;
 216         } else
 217                 return (char *)p;
 218 }
 219
 220
 221 static __be32
 222 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 223 {
 224         u32 bmlen;
 225         DECODE_HEAD;
 226
 227         bmval[0] = 0;
 228         bmval[1] = 0;
 229
 230         READ_BUF(4);
 231         READ32(bmlen);
 232         if (bmlen > 1000)
 233                 goto xdr_error;
 234
 235         READ_BUF(bmlen << 2);
 236         if (bmlen > 0)
 237                 READ32(bmval[0]);
 238         if (bmlen > 1)
 239                 READ32(bmval[1]);
 240
 241         DECODE_TAIL;
 242 }
 243
 244 static __be32
 245 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 246     struct nfs4_acl **acl)
 247 {
 248         int expected_len, len = 0;
 249         u32 dummy32;
 250         char *buf;
 251         int host_err;
 252
 253         DECODE_HEAD;
 254         iattr->ia_valid = 0;
 255         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 256                 return status;
 257
 258         /*
 259          * According to spec, unsupported attributes return ERR_NOTSUPP;
 260          * read-only attributes return ERR_INVAL.
 261          */
 262         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 263                 return nfserr_attrnotsupp;
 264         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 265                 return nfserr_inval;
 266
 267         READ_BUF(4);
 268         READ32(expected_len);
 269
 270         if (bmval[0] & FATTR4_WORD0_SIZE) {
 271                 READ_BUF(8);
 272                 len += 8;
 273                 READ64(iattr->ia_size);
 274                 iattr->ia_valid |= ATTR_SIZE;
 275         }
 276         if (bmval[0] & FATTR4_WORD0_ACL) {
 277                 int nace, i;
 278                 struct nfs4_ace ace;
 279
 280                 READ_BUF(4); len += 4;
 281                 READ32(nace);
 282
 283                 *acl = nfs4_acl_new();
 284                 if (*acl == NULL) {
 285                         host_err = -ENOMEM;
 286                         goto out_nfserr;
 287                 }
 288                 defer_free(argp, (void (*)(const void *))nfs4_acl_free, *acl);
 289
 290                 for (i = 0; i < nace; i++) {
 291                         READ_BUF(16); len += 16;
 292                         READ32(ace.type);
 293                         READ32(ace.flag);
 294                         READ32(ace.access_mask);
 295                         READ32(dummy32);
 296                         READ_BUF(dummy32);
 297                         len += XDR_QUADLEN(dummy32) << 2;
 298                         READMEM(buf, dummy32);
 299                         ace.whotype = nfs4_acl_get_whotype(buf, dummy32);
 300                         host_err = 0;
 301                         if (ace.whotype != NFS4_ACL_WHO_NAMED)
 302                                 ace.who = 0;
 303                         else if (ace.flag & NFS4_ACE_IDENTIFIER_GROUP)
 304                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 305                                                 buf, dummy32, &ace.who);
 306                         else
 307                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 308                                                 buf, dummy32, &ace.who);
 309                         if (host_err)
 310                                 goto out_nfserr;
 311                         host_err = nfs4_acl_add_ace(*acl, ace.type, ace.flag,
 312                                  ace.access_mask, ace.whotype, ace.who);
 313                         if (host_err)
 314                                 goto out_nfserr;
 315                 }
 316         } else
 317                 *acl = NULL;
 318         if (bmval[1] & FATTR4_WORD1_MODE) {
 319                 READ_BUF(4);
 320                 len += 4;
 321                 READ32(iattr->ia_mode);
 322                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 323                 iattr->ia_valid |= ATTR_MODE;
 324         }
 325         if (bmval[1] & FATTR4_WORD1_OWNER) {
 326                 READ_BUF(4);
 327                 len += 4;
 328                 READ32(dummy32);
 329                 READ_BUF(dummy32);
 330                 len += (XDR_QUADLEN(dummy32) << 2);
 331                 READMEM(buf, dummy32);
 332                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 333                         goto out_nfserr;
 334                 iattr->ia_valid |= ATTR_UID;
 335         }
 336         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 337                 READ_BUF(4);
 338                 len += 4;
 339                 READ32(dummy32);
 340                 READ_BUF(dummy32);
 341                 len += (XDR_QUADLEN(dummy32) << 2);
 342                 READMEM(buf, dummy32);
 343                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 344                         goto out_nfserr;
 345                 iattr->ia_valid |= ATTR_GID;
 346         }
 347         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 348                 READ_BUF(4);
 349                 len += 4;
 350                 READ32(dummy32);
 351                 switch (dummy32) {
 352                 case NFS4_SET_TO_CLIENT_TIME:
 353                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 354                            all 32 bits of 'nseconds'. */
 355                         READ_BUF(12);
 356                         len += 12;
 357                         READ32(dummy32);
 358                         if (dummy32)
 359                                 return nfserr_inval;
 360                         READ32(iattr->ia_atime.tv_sec);
 361                         READ32(iattr->ia_atime.tv_nsec);
 362                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 363                                 return nfserr_inval;
 364                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 365                         break;
 366                 case NFS4_SET_TO_SERVER_TIME:
 367                         iattr->ia_valid |= ATTR_ATIME;
 368                         break;
 369                 default:
 370                         goto xdr_error;
 371                 }
 372         }
 373         if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
 374                 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 375                    all 32 bits of 'nseconds'. */
 376                 READ_BUF(12);
 377                 len += 12;
 378                 READ32(dummy32);
 379                 if (dummy32)
 380                         return nfserr_inval;
 381                 READ32(iattr->ia_ctime.tv_sec);
 382                 READ32(iattr->ia_ctime.tv_nsec);
 383                 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
 384                         return nfserr_inval;
 385                 iattr->ia_valid |= ATTR_CTIME;
 386         }
 387         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 388                 READ_BUF(4);
 389                 len += 4;
 390                 READ32(dummy32);
 391                 switch (dummy32) {
 392                 case NFS4_SET_TO_CLIENT_TIME:
 393                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 394                            all 32 bits of 'nseconds'. */
 395                         READ_BUF(12);
 396                         len += 12;
 397                         READ32(dummy32);
 398                         if (dummy32)
 399                                 return nfserr_inval;
 400                         READ32(iattr->ia_mtime.tv_sec);
 401                         READ32(iattr->ia_mtime.tv_nsec);
 402                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 403                                 return nfserr_inval;
 404                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 405                         break;
 406                 case NFS4_SET_TO_SERVER_TIME:
 407                         iattr->ia_valid |= ATTR_MTIME;
 408                         break;
 409                 default:
 410                         goto xdr_error;
 411                 }
 412         }
 413         if (len != expected_len)
 414                 goto xdr_error;
 415
 416         DECODE_TAIL;
 417
 418 out_nfserr:
 419         status = nfserrno(host_err);
 420         goto out;
 421 }
 422
 423 static __be32
 424 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 425 {
 426         DECODE_HEAD;
 427
 428         READ_BUF(4);
 429         READ32(access->ac_req_access);
 430
 431         DECODE_TAIL;
 432 }
 433
 434 static __be32
 435 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 436 {
 437         DECODE_HEAD;
 438
 439         close->cl_stateowner = NULL;
 440         READ_BUF(4 + sizeof(stateid_t));
 441         READ32(close->cl_seqid);
 442         READ32(close->cl_stateid.si_generation);
 443         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
 444
 445         DECODE_TAIL;
 446 }
 447
 448
 449 static __be32
 450 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 451 {
 452         DECODE_HEAD;
 453
 454         READ_BUF(12);
 455         READ64(commit->co_offset);
 456         READ32(commit->co_count);
 457
 458         DECODE_TAIL;
 459 }
 460
 461 static __be32
 462 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 463 {
 464         DECODE_HEAD;
 465
 466         READ_BUF(4);
 467         READ32(create->cr_type);
 468         switch (create->cr_type) {
 469         case NF4LNK:
 470                 READ_BUF(4);
 471                 READ32(create->cr_linklen);
 472                 READ_BUF(create->cr_linklen);
 473                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 474                 break;
 475         case NF4BLK:
 476         case NF4CHR:
 477                 READ_BUF(8);
 478                 READ32(create->cr_specdata1);
 479                 READ32(create->cr_specdata2);
 480                 break;
 481         case NF4SOCK:
 482         case NF4FIFO:
 483         case NF4DIR:
 484         default:
 485                 break;
 486         }
 487
 488         READ_BUF(4);
 489         READ32(create->cr_namelen);
 490         READ_BUF(create->cr_namelen);
 491         SAVEMEM(create->cr_name, create->cr_namelen);
 492         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 493                 return status;
 494
 495         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 496                 goto out;
 497
 498         DECODE_TAIL;
 499 }
 500
 501 static inline __be32
 502 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 503 {
 504         DECODE_HEAD;
 505
 506         READ_BUF(sizeof(stateid_t));
 507         READ32(dr->dr_stateid.si_generation);
 508         COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
 509
 510         DECODE_TAIL;
 511 }
 512
 513 static inline __be32
 514 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 515 {
 516         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 517 }
 518
 519 static __be32
 520 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 521 {
 522         DECODE_HEAD;
 523
 524         READ_BUF(4);
 525         READ32(link->li_namelen);
 526         READ_BUF(link->li_namelen);
 527         SAVEMEM(link->li_name, link->li_namelen);
 528         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 529                 return status;
 530
 531         DECODE_TAIL;
 532 }
 533
 534 static __be32
 535 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 536 {
 537         DECODE_HEAD;
 538
 539         lock->lk_replay_owner = NULL;
 540         /*
 541         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 542         */
 543         READ_BUF(28);
 544         READ32(lock->lk_type);
 545         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 546                 goto xdr_error;
 547         READ32(lock->lk_reclaim);
 548         READ64(lock->lk_offset);
 549         READ64(lock->lk_length);
 550         READ32(lock->lk_is_new);
 551
 552         if (lock->lk_is_new) {
 553                 READ_BUF(36);
 554                 READ32(lock->lk_new_open_seqid);
 555                 READ32(lock->lk_new_open_stateid.si_generation);
 556
 557                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
 558                 READ32(lock->lk_new_lock_seqid);
 559                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 560                 READ32(lock->lk_new_owner.len);
 561                 READ_BUF(lock->lk_new_owner.len);
 562                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 563         } else {
 564                 READ_BUF(20);
 565                 READ32(lock->lk_old_lock_stateid.si_generation);
 566                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
 567                 READ32(lock->lk_old_lock_seqid);
 568         }
 569
 570         DECODE_TAIL;
 571 }
 572
 573 static __be32
 574 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 575 {
 576         DECODE_HEAD;
 577
 578         READ_BUF(32);
 579         READ32(lockt->lt_type);
 580         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 581                 goto xdr_error;
 582         READ64(lockt->lt_offset);
 583         READ64(lockt->lt_length);
 584         COPYMEM(&lockt->lt_clientid, 8);
 585         READ32(lockt->lt_owner.len);
 586         READ_BUF(lockt->lt_owner.len);
 587         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 588
 589         DECODE_TAIL;
 590 }
 591
 592 static __be32
 593 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 594 {
 595         DECODE_HEAD;
 596
 597         locku->lu_stateowner = NULL;
 598         READ_BUF(24 + sizeof(stateid_t));
 599         READ32(locku->lu_type);
 600         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 601                 goto xdr_error;
 602         READ32(locku->lu_seqid);
 603         READ32(locku->lu_stateid.si_generation);
 604         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
 605         READ64(locku->lu_offset);
 606         READ64(locku->lu_length);
 607
 608         DECODE_TAIL;
 609 }
 610
 611 static __be32
 612 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 613 {
 614         DECODE_HEAD;
 615
 616         READ_BUF(4);
 617         READ32(lookup->lo_len);
 618         READ_BUF(lookup->lo_len);
 619         SAVEMEM(lookup->lo_name, lookup->lo_len);
 620         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 621                 return status;
 622
 623         DECODE_TAIL;
 624 }
 625
 626 static __be32
 627 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 628 {
 629         DECODE_HEAD;
 630
 631         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 632         open->op_iattr.ia_valid = 0;
 633         open->op_stateowner = NULL;
 634
 635         /* seqid, share_access, share_deny, clientid, ownerlen */
 636         READ_BUF(16 + sizeof(clientid_t));
 637         READ32(open->op_seqid);
 638         READ32(open->op_share_access);
 639         READ32(open->op_share_deny);
 640         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 641         READ32(open->op_owner.len);
 642
 643         /* owner, open_flag */
 644         READ_BUF(open->op_owner.len + 4);
 645         SAVEMEM(open->op_owner.data, open->op_owner.len);
 646         READ32(open->op_create);
 647         switch (open->op_create) {
 648         case NFS4_OPEN_NOCREATE:
 649                 break;
 650         case NFS4_OPEN_CREATE:
 651                 READ_BUF(4);
 652                 READ32(open->op_createmode);
 653                 switch (open->op_createmode) {
 654                 case NFS4_CREATE_UNCHECKED:
 655                 case NFS4_CREATE_GUARDED:
 656                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 657                                 goto out;
 658                         break;
 659                 case NFS4_CREATE_EXCLUSIVE:
 660                         READ_BUF(8);
 661                         COPYMEM(open->op_verf.data, 8);
 662                         break;
 663                 default:
 664                         goto xdr_error;
 665                 }
 666                 break;
 667         default:
 668                 goto xdr_error;
 669         }
 670
 671         /* open_claim */
 672         READ_BUF(4);
 673         READ32(open->op_claim_type);
 674         switch (open->op_claim_type) {
 675         case NFS4_OPEN_CLAIM_NULL:
 676         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 677                 READ_BUF(4);
 678                 READ32(open->op_fname.len);
 679                 READ_BUF(open->op_fname.len);
 680                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 681                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 682                         return status;
 683                 break;
 684         case NFS4_OPEN_CLAIM_PREVIOUS:
 685                 READ_BUF(4);
 686                 READ32(open->op_delegate_type);
 687                 break;
 688         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 689                 READ_BUF(sizeof(stateid_t) + 4);
 690                 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
 691                 READ32(open->op_fname.len);
 692                 READ_BUF(open->op_fname.len);
 693                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 694                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 695                         return status;
 696                 break;
 697         default:
 698                 goto xdr_error;
 699         }
 700
 701         DECODE_TAIL;
 702 }
 703
 704 static __be32
 705 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 706 {
 707         DECODE_HEAD;
 708
 709         open_conf->oc_stateowner = NULL;
 710         READ_BUF(4 + sizeof(stateid_t));
 711         READ32(open_conf->oc_req_stateid.si_generation);
 712         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
 713         READ32(open_conf->oc_seqid);
 714
 715         DECODE_TAIL;
 716 }
 717
 718 static __be32
 719 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 720 {
 721         DECODE_HEAD;
 722
 723         open_down->od_stateowner = NULL;
 724         READ_BUF(12 + sizeof(stateid_t));
 725         READ32(open_down->od_stateid.si_generation);
 726         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
 727         READ32(open_down->od_seqid);
 728         READ32(open_down->od_share_access);
 729         READ32(open_down->od_share_deny);
 730
 731         DECODE_TAIL;
 732 }
 733
 734 static __be32
 735 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 736 {
 737         DECODE_HEAD;
 738
 739         READ_BUF(4);
 740         READ32(putfh->pf_fhlen);
 741         if (putfh->pf_fhlen > NFS4_FHSIZE)
 742                 goto xdr_error;
 743         READ_BUF(putfh->pf_fhlen);
 744         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 745
 746         DECODE_TAIL;
 747 }
 748
 749 static __be32
 750 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 751 {
 752         DECODE_HEAD;
 753
 754         READ_BUF(sizeof(stateid_t) + 12);
 755         READ32(read->rd_stateid.si_generation);
 756         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
 757         READ64(read->rd_offset);
 758         READ32(read->rd_length);
 759
 760         DECODE_TAIL;
 761 }
 762
 763 static __be32
 764 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 765 {
 766         DECODE_HEAD;
 767
 768         READ_BUF(24);
 769         READ64(readdir->rd_cookie);
 770         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 771         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 772         READ32(readdir->rd_maxcount);
 773         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 774                 goto out;
 775
 776         DECODE_TAIL;
 777 }
 778
 779 static __be32
 780 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 781 {
 782         DECODE_HEAD;
 783
 784         READ_BUF(4);
 785         READ32(remove->rm_namelen);
 786         READ_BUF(remove->rm_namelen);
 787         SAVEMEM(remove->rm_name, remove->rm_namelen);
 788         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 789                 return status;
 790
 791         DECODE_TAIL;
 792 }
 793
 794 static __be32
 795 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 796 {
 797         DECODE_HEAD;
 798
 799         READ_BUF(4);
 800         READ32(rename->rn_snamelen);
 801         READ_BUF(rename->rn_snamelen + 4);
 802         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 803         READ32(rename->rn_tnamelen);
 804         READ_BUF(rename->rn_tnamelen);
 805         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 806         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 807                 return status;
 808         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 809                 return status;
 810
 811         DECODE_TAIL;
 812 }
 813
 814 static __be32
 815 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 816 {
 817         DECODE_HEAD;
 818
 819         READ_BUF(sizeof(clientid_t));
 820         COPYMEM(clientid, sizeof(clientid_t));
 821
 822         DECODE_TAIL;
 823 }
 824
 825 static __be32
 826 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 827 {
 828         DECODE_HEAD;
 829
 830         READ_BUF(sizeof(stateid_t));
 831         READ32(setattr->sa_stateid.si_generation);
 832         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 833         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 834                 goto out;
 835
 836         DECODE_TAIL;
 837 }
 838
 839 static __be32
 840 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 841 {
 842         DECODE_HEAD;
 843
 844         READ_BUF(12);
 845         COPYMEM(setclientid->se_verf.data, 8);
 846         READ32(setclientid->se_namelen);
 847
 848         READ_BUF(setclientid->se_namelen + 8);
 849         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 850         READ32(setclientid->se_callback_prog);
 851         READ32(setclientid->se_callback_netid_len);
 852
 853         READ_BUF(setclientid->se_callback_netid_len + 4);
 854         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 855         READ32(setclientid->se_callback_addr_len);
 856
 857         READ_BUF(setclientid->se_callback_addr_len + 4);
 858         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 859         READ32(setclientid->se_callback_ident);
 860
 861         DECODE_TAIL;
 862 }
 863
 864 static __be32
 865 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 866 {
 867         DECODE_HEAD;
 868
 869         READ_BUF(8 + sizeof(nfs4_verifier));
 870         COPYMEM(&scd_c->sc_clientid, 8);
 871         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 872
 873         DECODE_TAIL;
 874 }
 875
 876 /* Also used for NVERIFY */
 877 static __be32
 878 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 879 {
 880 #if 0
 881         struct nfsd4_compoundargs save = {
 882                 .p = argp->p,
 883                 .end = argp->end,
 884                 .rqstp = argp->rqstp,
 885         };
 886         u32             ve_bmval[2];
 887         struct iattr    ve_iattr;           /* request */
 888         struct nfs4_acl *ve_acl;            /* request */
 889 #endif
 890         DECODE_HEAD;
 891
 892         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 893                 goto out;
 894
 895         /* For convenience's sake, we compare raw xdr'd attributes in
 896          * nfsd4_proc_verify; however we still decode here just to return
 897          * correct error in case of bad xdr. */
 898 #if 0
 899         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 900         if (status == nfserr_inval) {
 901                 status = nfserrno(status);
 902                 goto out;
 903         }
 904 #endif
 905         READ_BUF(4);
 906         READ32(verify->ve_attrlen);
 907         READ_BUF(verify->ve_attrlen);
 908         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 909
 910         DECODE_TAIL;
 911 }
 912
 913 static __be32
 914 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 915 {
 916         int avail;
 917         int v;
 918         int len;
 919         DECODE_HEAD;
 920
 921         READ_BUF(sizeof(stateid_opaque_t) + 20);
 922         READ32(write->wr_stateid.si_generation);
 923         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
 924         READ64(write->wr_offset);
 925         READ32(write->wr_stable_how);
 926         if (write->wr_stable_how > 2)
 927                 goto xdr_error;
 928         READ32(write->wr_buflen);
 929
 930         /* Sorry .. no magic macros for this.. *
 931          * READ_BUF(write->wr_buflen);
 932          * SAVEMEM(write->wr_buf, write->wr_buflen);
 933          */
 934         avail = (char*)argp->end - (char*)argp->p;
 935         if (avail + argp->pagelen < write->wr_buflen) {
 936                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__);
 937                 goto xdr_error;
 938         }
 939         argp->rqstp->rq_vec[0].iov_base = p;
 940         argp->rqstp->rq_vec[0].iov_len = avail;
 941         v = 0;
 942         len = write->wr_buflen;
 943         while (len > argp->rqstp->rq_vec[v].iov_len) {
 944                 len -= argp->rqstp->rq_vec[v].iov_len;
 945                 v++;
 946                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 947                 argp->pagelist++;
 948                 if (argp->pagelen >= PAGE_SIZE) {
 949                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 950                         argp->pagelen -= PAGE_SIZE;
 951                 } else {
 952                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 953                         argp->pagelen -= len;
 954                 }
 955         }
 956         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 957         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 958         argp->rqstp->rq_vec[v].iov_len = len;
 959         write->wr_vlen = v+1;
 960
 961         DECODE_TAIL;
 962 }
 963
 964 static __be32
 965 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 966 {
 967         DECODE_HEAD;
 968
 969         READ_BUF(12);
 970         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 971         READ32(rlockowner->rl_owner.len);
 972         READ_BUF(rlockowner->rl_owner.len);
 973         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 974
 975         DECODE_TAIL;
 976 }
 977
 978 static __be32
 979 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 980 {
 981         DECODE_HEAD;
 982         struct nfsd4_op *op;
 983         int i;
 984
 985         /*
 986          * XXX: According to spec, we should check the tag
 987          * for UTF-8 compliance.  I'm postponing this for
 988          * now because it seems that some clients do use
 989          * binary tags.
 990          */
 991         READ_BUF(4);
 992         READ32(argp->taglen);
 993         READ_BUF(argp->taglen + 8);
 994         SAVEMEM(argp->tag, argp->taglen);
 995         READ32(argp->minorversion);
 996         READ32(argp->opcnt);
 997
 998         if (argp->taglen > NFSD4_MAX_TAGLEN)
 999                 goto xdr_error;
1000         if (argp->opcnt > 100)
1001                 goto xdr_error;
1002
1003         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1004                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1005                 if (!argp->ops) {
1006                         argp->ops = argp->iops;
1007                         printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
1008                         goto xdr_error;
1009                 }
1010         }
1011
1012         for (i = 0; i < argp->opcnt; i++) {
1013                 op = &argp->ops[i];
1014                 op->replay = NULL;
1015
1016                 /*
1017                  * We can't use READ_BUF() here because we need to handle
1018                  * a missing opcode as an OP_WRITE + 1. So we need to check
1019                  * to see if we're truly at the end of our buffer or if there
1020                  * is another page we need to flip to.
1021                  */
1022
1023                 if (argp->p == argp->end) {
1024                         if (argp->pagelen < 4) {
1025                                 /* There isn't an opcode still on the wire */
1026                                 op->opnum = OP_WRITE + 1;
1027                                 op->status = nfserr_bad_xdr;
1028                                 argp->opcnt = i+1;
1029                                 break;
1030                         }
1031
1032                         /*
1033                          * False alarm. We just hit a page boundary, but there
1034                          * is still data available.  Move pointer across page
1035                          * boundary.  *snip from READ_BUF*
1036                          */
1037                         argp->p = page_address(argp->pagelist[0]);
1038                         argp->pagelist++;
1039                         if (argp->pagelen < PAGE_SIZE) {
1040                                 argp->end = p + (argp->pagelen>>2);
1041                                 argp->pagelen = 0;
1042                         } else {
1043                                 argp->end = p + (PAGE_SIZE>>2);
1044                                 argp->pagelen -= PAGE_SIZE;
1045                         }
1046                 }
1047                 op->opnum = ntohl(*argp->p++);
1048
1049                 switch (op->opnum) {
1050                 case 2: /* Reserved operation */
1051                         op->opnum = OP_ILLEGAL;
1052                         if (argp->minorversion == 0)
1053                                 op->status = nfserr_op_illegal;
1054                         else
1055                                 op->status = nfserr_minor_vers_mismatch;
1056                         break;
1057                 case OP_ACCESS:
1058                         op->status = nfsd4_decode_access(argp, &op->u.access);
1059                         break;
1060                 case OP_CLOSE:
1061                         op->status = nfsd4_decode_close(argp, &op->u.close);
1062                         break;
1063                 case OP_COMMIT:
1064                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1065                         break;
1066                 case OP_CREATE:
1067                         op->status = nfsd4_decode_create(argp, &op->u.create);
1068                         break;
1069                 case OP_DELEGRETURN:
1070                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1071                         break;
1072                 case OP_GETATTR:
1073                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1074                         break;
1075                 case OP_GETFH:
1076                         op->status = nfs_ok;
1077                         break;
1078                 case OP_LINK:
1079                         op->status = nfsd4_decode_link(argp, &op->u.link);
1080                         break;
1081                 case OP_LOCK:
1082                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1083                         break;
1084                 case OP_LOCKT:
1085                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1086                         break;
1087                 case OP_LOCKU:
1088                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1089                         break;
1090                 case OP_LOOKUP:
1091                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1092                         break;
1093                 case OP_LOOKUPP:
1094                         op->status = nfs_ok;
1095                         break;
1096                 case OP_NVERIFY:
1097                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1098                         break;
1099                 case OP_OPEN:
1100                         op->status = nfsd4_decode_open(argp, &op->u.open);
1101                         break;
1102                 case OP_OPEN_CONFIRM:
1103                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1104                         break;
1105                 case OP_OPEN_DOWNGRADE:
1106                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1107                         break;
1108                 case OP_PUTFH:
1109                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1110                         break;
1111                 case OP_PUTROOTFH:
1112                         op->status = nfs_ok;
1113                         break;
1114                 case OP_READ:
1115                         op->status = nfsd4_decode_read(argp, &op->u.read);
1116                         break;
1117                 case OP_READDIR:
1118                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1119                         break;
1120                 case OP_READLINK:
1121                         op->status = nfs_ok;
1122                         break;
1123                 case OP_REMOVE:
1124                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1125                         break;
1126                 case OP_RENAME:
1127                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1128                         break;
1129                 case OP_RESTOREFH:
1130                         op->status = nfs_ok;
1131                         break;
1132                 case OP_RENEW:
1133                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1134                         break;
1135                 case OP_SAVEFH:
1136                         op->status = nfs_ok;
1137                         break;
1138                 case OP_SETATTR:
1139                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1140                         break;
1141                 case OP_SETCLIENTID:
1142                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1143                         break;
1144                 case OP_SETCLIENTID_CONFIRM:
1145                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1146                         break;
1147                 case OP_VERIFY:
1148                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1149                         break;
1150                 case OP_WRITE:
1151                         op->status = nfsd4_decode_write(argp, &op->u.write);
1152                         break;
1153                 case OP_RELEASE_LOCKOWNER:
1154                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1155                         break;
1156                 default:
1157                         op->opnum = OP_ILLEGAL;
1158                         op->status = nfserr_op_illegal;
1159                         break;
1160                 }
1161
1162                 if (op->status) {
1163                         argp->opcnt = i+1;
1164                         break;
1165                 }
1166         }
1167
1168         DECODE_TAIL;
1169 }
1170 /*
1171  * END OF "GENERIC" DECODE ROUTINES.
1172  */
1173
1174 /*
1175  * START OF "GENERIC" ENCODE ROUTINES.
1176  *   These may look a little ugly since they are imported from a "generic"
1177  * set of XDR encode/decode routines which are intended to be shared by
1178  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1179  *
1180  * If the pain of reading these is too great, it should be a straightforward
1181  * task to translate them into Linux-specific versions which are more
1182  * consistent with the style used in NFSv2/v3...
1183  */
1184 #define ENCODE_HEAD              __be32 *p
1185
1186 #define WRITE32(n)               *p++ = htonl(n)
1187 #define WRITE64(n)               do {                           \
1188         *p++ = htonl((u32)((n) >> 32));                         \
1189         *p++ = htonl((u32)(n));                                 \
1190 } while (0)
1191 #define WRITEMEM(ptr,nbytes)     do {                           \
1192         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1193         memcpy(p, ptr, nbytes);                                 \
1194         p += XDR_QUADLEN(nbytes);                               \
1195 } while (0)
1196 #define WRITECINFO(c)           do {                            \
1197         *p++ = htonl(c.atomic);                                 \
1198         *p++ = htonl(c.before_ctime_sec);                               \
1199         *p++ = htonl(c.before_ctime_nsec);                              \
1200         *p++ = htonl(c.after_ctime_sec);                                \
1201         *p++ = htonl(c.after_ctime_nsec);                               \
1202 } while (0)
1203
1204 #define RESERVE_SPACE(nbytes)   do {                            \
1205         p = resp->p;                                            \
1206         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1207 } while (0)
1208 #define ADJUST_ARGS()           resp->p = p
1209
1210 /*
1211  * Header routine to setup seqid operation replay cache
1212  */
1213 #define ENCODE_SEQID_OP_HEAD                                    \
1214         __be32 *p;                                              \
1215         __be32 *save;                                           \
1216                                                                 \
1217         save = resp->p;
1218
1219 /*
1220  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1221  * is where sequence id's are incremented, and the replay cache is filled.
1222  * Note that we increment sequence id's here, at the last moment, so we're sure
1223  * we know whether the error to be returned is a sequence id mutating error.
1224  */
1225
1226 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1227         if (seqid_mutating_err(nfserr) && stateowner) {         \
1228                 stateowner->so_seqid++;                         \
1229                 stateowner->so_replay.rp_status = nfserr;       \
1230                 stateowner->so_replay.rp_buflen =               \
1231                           (((char *)(resp)->p - (char *)save)); \
1232                 memcpy(stateowner->so_replay.rp_buf, save,      \
1233                         stateowner->so_replay.rp_buflen);       \
1234         } } while (0);
1235
1236 /* Encode as an array of strings the string given with components
1237  * seperated @sep.
1238  */
1239 static __be32 nfsd4_encode_components(char sep, char *components,
1240                                    __be32 **pp, int *buflen)
1241 {
1242         __be32 *p = *pp;
1243         __be32 *countp = p;
1244         int strlen, count=0;
1245         char *str, *end;
1246
1247         dprintk("nfsd4_encode_components(%s)\n", components);
1248         if ((*buflen -= 4) < 0)
1249                 return nfserr_resource;
1250         WRITE32(0); /* We will fill this in with @count later */
1251         end = str = components;
1252         while (*end) {
1253                 for (; *end && (*end != sep); end++)
1254                         ; /* Point to end of component */
1255                 strlen = end - str;
1256                 if (strlen) {
1257                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1258                                 return nfserr_resource;
1259                         WRITE32(strlen);
1260                         WRITEMEM(str, strlen);
1261                         count++;
1262                 }
1263                 else
1264                         end++;
1265                 str = end;
1266         }
1267         *pp = p;
1268         p = countp;
1269         WRITE32(count);
1270         return 0;
1271 }
1272
1273 /*
1274  * encode a location element of a fs_locations structure
1275  */
1276 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1277                                     __be32 **pp, int *buflen)
1278 {
1279         __be32 status;
1280         __be32 *p = *pp;
1281
1282         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1283         if (status)
1284                 return status;
1285         status = nfsd4_encode_components('/', location->path, &p, buflen);
1286         if (status)
1287                 return status;
1288         *pp = p;
1289         return 0;
1290 }
1291
1292 /*
1293  * Return the path to an export point in the pseudo filesystem namespace
1294  * Returned string is safe to use as long as the caller holds a reference
1295  * to @exp.
1296  */
1297 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1298 {
1299         struct svc_fh tmp_fh;
1300         char *path, *rootpath;
1301
1302         fh_init(&tmp_fh, NFS4_FHSIZE);
1303         *stat = exp_pseudoroot(rqstp->rq_client, &tmp_fh, &rqstp->rq_chandle);
1304         if (*stat)
1305                 return NULL;
1306         rootpath = tmp_fh.fh_export->ex_path;
1307
1308         path = exp->ex_path;
1309
1310         if (strncmp(path, rootpath, strlen(rootpath))) {
1311                 printk("nfsd: fs_locations failed;"
1312                         "%s is not contained in %s\n", path, rootpath);
1313                 *stat = nfserr_notsupp;
1314                 return NULL;
1315         }
1316
1317         return path + strlen(rootpath);
1318 }
1319
1320 /*
1321  *  encode a fs_locations structure
1322  */
1323 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1324                                      struct svc_export *exp,
1325                                      __be32 **pp, int *buflen)
1326 {
1327         __be32 status;
1328         int i;
1329         __be32 *p = *pp;
1330         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1331         char *root = nfsd4_path(rqstp, exp, &status);
1332
1333         if (status)
1334                 return status;
1335         status = nfsd4_encode_components('/', root, &p, buflen);
1336         if (status)
1337                 return status;
1338         if ((*buflen -= 4) < 0)
1339                 return nfserr_resource;
1340         WRITE32(fslocs->locations_count);
1341         for (i=0; i<fslocs->locations_count; i++) {
1342                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1343                                                    &p, buflen);
1344                 if (status)
1345                         return status;
1346         }
1347         *pp = p;
1348         return 0;
1349 }
1350
1351 static u32 nfs4_ftypes[16] = {
1352         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1353         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1354         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1355         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1356 };
1357
1358 static __be32
1359 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1360                         __be32 **p, int *buflen)
1361 {
1362         int status;
1363
1364         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1365                 return nfserr_resource;
1366         if (whotype != NFS4_ACL_WHO_NAMED)
1367                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1368         else if (group)
1369                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1370         else
1371                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1372         if (status < 0)
1373                 return nfserrno(status);
1374         *p = xdr_encode_opaque(*p, NULL, status);
1375         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1376         BUG_ON(*buflen < 0);
1377         return 0;
1378 }
1379
1380 static inline __be32
1381 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1382 {
1383         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1384 }
1385
1386 static inline __be32
1387 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1388 {
1389         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1390 }
1391
1392 static inline __be32
1393 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1394                 __be32 **p, int *buflen)
1395 {
1396         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1397 }
1398
1399 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1400                               FATTR4_WORD0_RDATTR_ERROR)
1401 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1402
1403 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1404 {
1405         /* As per referral draft:  */
1406         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1407             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1408                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1409                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1410                         *rdattr_err = NFSERR_MOVED;
1411                 else
1412                         return nfserr_moved;
1413         }
1414         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1415         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1416         return 0;
1417 }
1418
1419 /*
1420  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1421  * ourselves.
1422  *
1423  * @countp is the buffer size in _words_; upon successful return this becomes
1424  * replaced with the number of words written.
1425  */
1426 __be32
1427 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1428                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1429                 struct svc_rqst *rqstp)
1430 {
1431         u32 bmval0 = bmval[0];
1432         u32 bmval1 = bmval[1];
1433         struct kstat stat;
1434         struct svc_fh tempfh;
1435         struct kstatfs statfs;
1436         int buflen = *countp << 2;
1437         __be32 *attrlenp;
1438         u32 dummy;
1439         u64 dummy64;
1440         u32 rdattr_err = 0;
1441         __be32 *p = buffer;
1442         __be32 status;
1443         int err;
1444         int aclsupport = 0;
1445         struct nfs4_acl *acl = NULL;
1446
1447         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1448         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1449         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1450
1451         if (exp->ex_fslocs.migrated) {
1452                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1453                 if (status)
1454                         goto out;
1455         }
1456
1457         err = vfs_getattr(exp->ex_mnt, dentry, &stat);
1458         if (err)
1459                 goto out_nfserr;
1460         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1461             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1462                        FATTR4_WORD1_SPACE_TOTAL))) {
1463                 err = vfs_statfs(dentry, &statfs);
1464                 if (err)
1465                         goto out_nfserr;
1466         }
1467         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1468                 fh_init(&tempfh, NFS4_FHSIZE);
1469                 status = fh_compose(&tempfh, exp, dentry, NULL);
1470                 if (status)
1471                         goto out;
1472                 fhp = &tempfh;
1473         }
1474         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1475                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1476                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1477                 aclsupport = (err == 0);
1478                 if (bmval0 & FATTR4_WORD0_ACL) {
1479                         if (err == -EOPNOTSUPP)
1480                                 bmval0 &= ~FATTR4_WORD0_ACL;
1481                         else if (err == -EINVAL) {
1482                                 status = nfserr_attrnotsupp;
1483                                 goto out;
1484                         } else if (err != 0)
1485                                 goto out_nfserr;
1486                 }
1487         }
1488         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1489                 if (exp->ex_fslocs.locations == NULL) {
1490                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1491                 }
1492         }
1493         if ((buflen -= 16) < 0)
1494                 goto out_resource;
1495
1496         WRITE32(2);
1497         WRITE32(bmval0);
1498         WRITE32(bmval1);
1499         attrlenp = p++;                /* to be backfilled later */
1500
1501         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1502                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1503                 if ((buflen -= 12) < 0)
1504                         goto out_resource;
1505                 if (!aclsupport)
1506                         word0 &= ~FATTR4_WORD0_ACL;
1507                 if (!exp->ex_fslocs.locations)
1508                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1509                 WRITE32(2);
1510                 WRITE32(word0);
1511                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1512         }
1513         if (bmval0 & FATTR4_WORD0_TYPE) {
1514                 if ((buflen -= 4) < 0)
1515                         goto out_resource;
1516                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1517                 if (dummy == NF4BAD)
1518                         goto out_serverfault;
1519                 WRITE32(dummy);
1520         }
1521         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1522                 if ((buflen -= 4) < 0)
1523                         goto out_resource;
1524                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1525                         WRITE32(NFS4_FH_PERSISTENT);
1526                 else
1527                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1528         }
1529         if (bmval0 & FATTR4_WORD0_CHANGE) {
1530                 /*
1531                  * Note: This _must_ be consistent with the scheme for writing
1532                  * change_info, so any changes made here must be reflected there
1533                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1534                  * macro above.)
1535                  */
1536                 if ((buflen -= 8) < 0)
1537                         goto out_resource;
1538                 WRITE32(stat.ctime.tv_sec);
1539                 WRITE32(stat.ctime.tv_nsec);
1540         }
1541         if (bmval0 & FATTR4_WORD0_SIZE) {
1542                 if ((buflen -= 8) < 0)
1543                         goto out_resource;
1544                 WRITE64(stat.size);
1545         }
1546         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1547                 if ((buflen -= 4) < 0)
1548                         goto out_resource;
1549                 WRITE32(1);
1550         }
1551         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1552                 if ((buflen -= 4) < 0)
1553                         goto out_resource;
1554                 WRITE32(1);
1555         }
1556         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1557                 if ((buflen -= 4) < 0)
1558                         goto out_resource;
1559                 WRITE32(0);
1560         }
1561         if (bmval0 & FATTR4_WORD0_FSID) {
1562                 if ((buflen -= 16) < 0)
1563                         goto out_resource;
1564                 if (exp->ex_fslocs.migrated) {
1565                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1566                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1567                 } else if (is_fsid(fhp, rqstp->rq_reffh)) {
1568                         WRITE64((u64)exp->ex_fsid);
1569                         WRITE64((u64)0);
1570                 } else {
1571                         WRITE32(0);
1572                         WRITE32(MAJOR(stat.dev));
1573                         WRITE32(0);
1574                         WRITE32(MINOR(stat.dev));
1575                 }
1576         }
1577         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1578                 if ((buflen -= 4) < 0)
1579                         goto out_resource;
1580                 WRITE32(0);
1581         }
1582         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1583                 if ((buflen -= 4) < 0)
1584                         goto out_resource;
1585                 WRITE32(NFSD_LEASE_TIME);
1586         }
1587         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1588                 if ((buflen -= 4) < 0)
1589                         goto out_resource;
1590                 WRITE32(rdattr_err);
1591         }
1592         if (bmval0 & FATTR4_WORD0_ACL) {
1593                 struct nfs4_ace *ace;
1594                 struct list_head *h;
1595
1596                 if (acl == NULL) {
1597                         if ((buflen -= 4) < 0)
1598                                 goto out_resource;
1599
1600                         WRITE32(0);
1601                         goto out_acl;
1602                 }
1603                 if ((buflen -= 4) < 0)
1604                         goto out_resource;
1605                 WRITE32(acl->naces);
1606
1607                 list_for_each(h, &acl->ace_head) {
1608                         ace = list_entry(h, struct nfs4_ace, l_ace);
1609
1610                         if ((buflen -= 4*3) < 0)
1611                                 goto out_resource;
1612                         WRITE32(ace->type);
1613                         WRITE32(ace->flag);
1614                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1615                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1616                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1617                                 &p, &buflen);
1618                         if (status == nfserr_resource)
1619                                 goto out_resource;
1620                         if (status)
1621                                 goto out;
1622                 }
1623         }
1624 out_acl:
1625         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1626                 if ((buflen -= 4) < 0)
1627                         goto out_resource;
1628                 WRITE32(aclsupport ?
1629                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1630         }
1631         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1632                 if ((buflen -= 4) < 0)
1633                         goto out_resource;
1634                 WRITE32(1);
1635         }
1636         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1637                 if ((buflen -= 4) < 0)
1638                         goto out_resource;
1639                 WRITE32(1);
1640         }
1641         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1642                 if ((buflen -= 4) < 0)
1643                         goto out_resource;
1644                 WRITE32(1);
1645         }
1646         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1647                 if ((buflen -= 4) < 0)
1648                         goto out_resource;
1649                 WRITE32(1);
1650         }
1651         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1652                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1653                 if (buflen < 0)
1654                         goto out_resource;
1655                 WRITE32(fhp->fh_handle.fh_size);
1656                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1657         }
1658         if (bmval0 & FATTR4_WORD0_FILEID) {
1659                 if ((buflen -= 8) < 0)
1660                         goto out_resource;
1661                 WRITE64((u64) stat.ino);
1662         }
1663         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1664                 if ((buflen -= 8) < 0)
1665                         goto out_resource;
1666                 WRITE64((u64) statfs.f_ffree);
1667         }
1668         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1669                 if ((buflen -= 8) < 0)
1670                         goto out_resource;
1671                 WRITE64((u64) statfs.f_ffree);
1672         }
1673         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1674                 if ((buflen -= 8) < 0)
1675                         goto out_resource;
1676                 WRITE64((u64) statfs.f_files);
1677         }
1678         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1679                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1680                 if (status == nfserr_resource)
1681                         goto out_resource;
1682                 if (status)
1683                         goto out;
1684         }
1685         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1686                 if ((buflen -= 4) < 0)
1687                         goto out_resource;
1688                 WRITE32(1);
1689         }
1690         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1691                 if ((buflen -= 8) < 0)
1692                         goto out_resource;
1693                 WRITE64(~(u64)0);
1694         }
1695         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1696                 if ((buflen -= 4) < 0)
1697                         goto out_resource;
1698                 WRITE32(255);
1699         }
1700         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1701                 if ((buflen -= 4) < 0)
1702                         goto out_resource;
1703                 WRITE32(~(u32) 0);
1704         }
1705         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1706                 if ((buflen -= 8) < 0)
1707                         goto out_resource;
1708                 WRITE64((u64) svc_max_payload(rqstp));
1709         }
1710         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1711                 if ((buflen -= 8) < 0)
1712                         goto out_resource;
1713                 WRITE64((u64) svc_max_payload(rqstp));
1714         }
1715         if (bmval1 & FATTR4_WORD1_MODE) {
1716                 if ((buflen -= 4) < 0)
1717                         goto out_resource;
1718                 WRITE32(stat.mode & S_IALLUGO);
1719         }
1720         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1721                 if ((buflen -= 4) < 0)
1722                         goto out_resource;
1723                 WRITE32(1);
1724         }
1725         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1726                 if ((buflen -= 4) < 0)
1727                         goto out_resource;
1728                 WRITE32(stat.nlink);
1729         }
1730         if (bmval1 & FATTR4_WORD1_OWNER) {
1731                 status = nfsd4_encode_user(rqstp,
1732                         TAGINO_UID(DX_TAG(dentry->d_inode),
1733                         stat.uid, stat.tag), &p, &buflen);
1734                 if (status == nfserr_resource)
1735                         goto out_resource;
1736                 if (status)
1737                         goto out;
1738         }
1739         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1740                 status = nfsd4_encode_group(rqstp,
1741                         TAGINO_GID(DX_TAG(dentry->d_inode),
1742                         stat.gid, stat.tag), &p, &buflen);
1743                 if (status == nfserr_resource)
1744                         goto out_resource;
1745                 if (status)
1746                         goto out;
1747         }
1748         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1749                 if ((buflen -= 8) < 0)
1750                         goto out_resource;
1751                 WRITE32((u32) MAJOR(stat.rdev));
1752                 WRITE32((u32) MINOR(stat.rdev));
1753         }
1754         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1755                 if ((buflen -= 8) < 0)
1756                         goto out_resource;
1757                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1758                 WRITE64(dummy64);
1759         }
1760         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1761                 if ((buflen -= 8) < 0)
1762                         goto out_resource;
1763                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1764                 WRITE64(dummy64);
1765         }
1766         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1767                 if ((buflen -= 8) < 0)
1768                         goto out_resource;
1769                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1770                 WRITE64(dummy64);
1771         }
1772         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1773                 if ((buflen -= 8) < 0)
1774                         goto out_resource;
1775                 dummy64 = (u64)stat.blocks << 9;
1776                 WRITE64(dummy64);
1777         }
1778         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1779                 if ((buflen -= 12) < 0)
1780                         goto out_resource;
1781                 WRITE32(0);
1782                 WRITE32(stat.atime.tv_sec);
1783                 WRITE32(stat.atime.tv_nsec);
1784         }
1785         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1786                 if ((buflen -= 12) < 0)
1787                         goto out_resource;
1788                 WRITE32(0);
1789                 WRITE32(1);
1790                 WRITE32(0);
1791         }
1792         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1793                 if ((buflen -= 12) < 0)
1794                         goto out_resource;
1795                 WRITE32(0);
1796                 WRITE32(stat.ctime.tv_sec);
1797                 WRITE32(stat.ctime.tv_nsec);
1798         }
1799         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1800                 if ((buflen -= 12) < 0)
1801                         goto out_resource;
1802                 WRITE32(0);
1803                 WRITE32(stat.mtime.tv_sec);
1804                 WRITE32(stat.mtime.tv_nsec);
1805         }
1806         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1807                 struct dentry *mnt_pnt, *mnt_root;
1808
1809                 if ((buflen -= 8) < 0)
1810                         goto out_resource;
1811                 mnt_root = exp->ex_mnt->mnt_root;
1812                 if (mnt_root->d_inode == dentry->d_inode) {
1813                         mnt_pnt = exp->ex_mnt->mnt_mountpoint;
1814                         WRITE64((u64) mnt_pnt->d_inode->i_ino);
1815                 } else
1816                         WRITE64((u64) stat.ino);
1817         }
1818         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1819         *countp = p - buffer;
1820         status = nfs_ok;
1821
1822 out:
1823         nfs4_acl_free(acl);
1824         if (fhp == &tempfh)
1825                 fh_put(&tempfh);
1826         return status;
1827 out_nfserr:
1828         status = nfserrno(err);
1829         goto out;
1830 out_resource:
1831         *countp = 0;
1832         status = nfserr_resource;
1833         goto out;
1834 out_serverfault:
1835         status = nfserr_serverfault;
1836         goto out;
1837 }
1838
1839 static __be32
1840 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1841                 const char *name, int namlen, __be32 *p, int *buflen)
1842 {
1843         struct svc_export *exp = cd->rd_fhp->fh_export;
1844         struct dentry *dentry;
1845         __be32 nfserr;
1846
1847         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1848         if (IS_ERR(dentry))
1849                 return nfserrno(PTR_ERR(dentry));
1850
1851         exp_get(exp);
1852         if (d_mountpoint(dentry)) {
1853                 int err;
1854
1855                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1856                 if (err) {
1857                         nfserr = nfserrno(err);
1858                         goto out_put;
1859                 }
1860
1861         }
1862         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1863                                         cd->rd_rqstp);
1864 out_put:
1865         dput(dentry);
1866         exp_put(exp);
1867         return nfserr;
1868 }
1869
1870 static __be32 *
1871 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1872 {
1873         __be32 *attrlenp;
1874
1875         if (buflen < 6)
1876                 return NULL;
1877         *p++ = htonl(2);
1878         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1879         *p++ = htonl(0);                         /* bmval1 */
1880
1881         attrlenp = p++;
1882         *p++ = nfserr;       /* no htonl */
1883         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1884         return p;
1885 }
1886
1887 static int
1888 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1889                     loff_t offset, u64 ino, unsigned int d_type)
1890 {
1891         struct readdir_cd *ccd = ccdv;
1892         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1893         int buflen;
1894         __be32 *p = cd->buffer;
1895         __be32 nfserr = nfserr_toosmall;
1896
1897         /* In nfsv4, "." and ".." never make it onto the wire.. */
1898         if (name && isdotent(name, namlen)) {
1899                 cd->common.err = nfs_ok;
1900                 return 0;
1901         }
1902
1903         if (cd->offset)
1904                 xdr_encode_hyper(cd->offset, (u64) offset);
1905
1906         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1907         if (buflen < 0)
1908                 goto fail;
1909
1910         *p++ = xdr_one;                             /* mark entry present */
1911         cd->offset = p;                             /* remember pointer */
1912         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1913         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1914
1915         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1916         switch (nfserr) {
1917         case nfs_ok:
1918                 p += buflen;
1919                 break;
1920         case nfserr_resource:
1921                 nfserr = nfserr_toosmall;
1922                 goto fail;
1923         case nfserr_dropit:
1924                 goto fail;
1925         default:
1926                 /*
1927                  * If the client requested the RDATTR_ERROR attribute,
1928                  * we stuff the error code into this attribute
1929                  * and continue.  If this attribute was not requested,
1930                  * then in accordance with the spec, we fail the
1931                  * entire READDIR operation(!)
1932                  */
1933                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1934                         goto fail;
1935                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1936                 if (p == NULL) {
1937                         nfserr = nfserr_toosmall;
1938                         goto fail;
1939                 }
1940         }
1941         cd->buflen -= (p - cd->buffer);
1942         cd->buffer = p;
1943         cd->common.err = nfs_ok;
1944         return 0;
1945 fail:
1946         cd->common.err = nfserr;
1947         return -EINVAL;
1948 }
1949
1950 static void
1951 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1952 {
1953         ENCODE_HEAD;
1954
1955         if (!nfserr) {
1956                 RESERVE_SPACE(8);
1957                 WRITE32(access->ac_supported);
1958                 WRITE32(access->ac_resp_access);
1959                 ADJUST_ARGS();
1960         }
1961 }
1962
1963 static void
1964 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1965 {
1966         ENCODE_SEQID_OP_HEAD;
1967
1968         if (!nfserr) {
1969                 RESERVE_SPACE(sizeof(stateid_t));
1970                 WRITE32(close->cl_stateid.si_generation);
1971                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1972                 ADJUST_ARGS();
1973         }
1974         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1975 }
1976
1977
1978 static void
1979 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
1980 {
1981         ENCODE_HEAD;
1982
1983         if (!nfserr) {
1984                 RESERVE_SPACE(8);
1985                 WRITEMEM(commit->co_verf.data, 8);
1986                 ADJUST_ARGS();
1987         }
1988 }
1989
1990 static void
1991 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
1992 {
1993         ENCODE_HEAD;
1994
1995         if (!nfserr) {
1996                 RESERVE_SPACE(32);
1997                 WRITECINFO(create->cr_cinfo);
1998                 WRITE32(2);
1999                 WRITE32(create->cr_bmval[0]);
2000                 WRITE32(create->cr_bmval[1]);
2001                 ADJUST_ARGS();
2002         }
2003 }
2004
2005 static __be32
2006 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2007 {
2008         struct svc_fh *fhp = getattr->ga_fhp;
2009         int buflen;
2010
2011         if (nfserr)
2012                 return nfserr;
2013
2014         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2015         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2016                                     resp->p, &buflen, getattr->ga_bmval,
2017                                     resp->rqstp);
2018         if (!nfserr)
2019                 resp->p += buflen;
2020         return nfserr;
2021 }
2022
2023 static void
2024 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh *fhp)
2025 {
2026         unsigned int len;
2027         ENCODE_HEAD;
2028
2029         if (!nfserr) {
2030                 len = fhp->fh_handle.fh_size;
2031                 RESERVE_SPACE(len + 4);
2032                 WRITE32(len);
2033                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2034                 ADJUST_ARGS();
2035         }
2036 }
2037
2038 /*
2039 * Including all fields other than the name, a LOCK4denied structure requires
2040 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2041 */
2042 static void
2043 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2044 {
2045         ENCODE_HEAD;
2046
2047         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2048         WRITE64(ld->ld_start);
2049         WRITE64(ld->ld_length);
2050         WRITE32(ld->ld_type);
2051         if (ld->ld_sop) {
2052                 WRITEMEM(&ld->ld_clientid, 8);
2053                 WRITE32(ld->ld_sop->so_owner.len);
2054                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2055                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2056         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2057                 WRITE64((u64)0); /* clientid */
2058                 WRITE32(0); /* length of owner name */
2059         }
2060         ADJUST_ARGS();
2061 }
2062
2063 static void
2064 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2065 {
2066         ENCODE_SEQID_OP_HEAD;
2067
2068         if (!nfserr) {
2069                 RESERVE_SPACE(4 + sizeof(stateid_t));
2070                 WRITE32(lock->lk_resp_stateid.si_generation);
2071                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2072                 ADJUST_ARGS();
2073         } else if (nfserr == nfserr_denied)
2074                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2075
2076         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2077 }
2078
2079 static void
2080 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2081 {
2082         if (nfserr == nfserr_denied)
2083                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2084 }
2085
2086 static void
2087 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2088 {
2089         ENCODE_SEQID_OP_HEAD;
2090
2091         if (!nfserr) {
2092                 RESERVE_SPACE(sizeof(stateid_t));
2093                 WRITE32(locku->lu_stateid.si_generation);
2094                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2095                 ADJUST_ARGS();
2096         }
2097
2098         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2099 }
2100
2101
2102 static void
2103 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2104 {
2105         ENCODE_HEAD;
2106
2107         if (!nfserr) {
2108                 RESERVE_SPACE(20);
2109                 WRITECINFO(link->li_cinfo);
2110                 ADJUST_ARGS();
2111         }
2112 }
2113
2114
2115 static void
2116 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2117 {
2118         ENCODE_SEQID_OP_HEAD;
2119
2120         if (nfserr)
2121                 goto out;
2122
2123         RESERVE_SPACE(36 + sizeof(stateid_t));
2124         WRITE32(open->op_stateid.si_generation);
2125         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2126         WRITECINFO(open->op_cinfo);
2127         WRITE32(open->op_rflags);
2128         WRITE32(2);
2129         WRITE32(open->op_bmval[0]);
2130         WRITE32(open->op_bmval[1]);
2131         WRITE32(open->op_delegate_type);
2132         ADJUST_ARGS();
2133
2134         switch (open->op_delegate_type) {
2135         case NFS4_OPEN_DELEGATE_NONE:
2136                 break;
2137         case NFS4_OPEN_DELEGATE_READ:
2138                 RESERVE_SPACE(20 + sizeof(stateid_t));
2139                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2140                 WRITE32(open->op_recall);
2141
2142                 /*
2143                  * TODO: ACE's in delegations
2144                  */
2145                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2146                 WRITE32(0);
2147                 WRITE32(0);
2148                 WRITE32(0);   /* XXX: is NULL principal ok? */
2149                 ADJUST_ARGS();
2150                 break;
2151         case NFS4_OPEN_DELEGATE_WRITE:
2152                 RESERVE_SPACE(32 + sizeof(stateid_t));
2153                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2154                 WRITE32(0);
2155
2156                 /*
2157                  * TODO: space_limit's in delegations
2158                  */
2159                 WRITE32(NFS4_LIMIT_SIZE);
2160                 WRITE32(~(u32)0);
2161                 WRITE32(~(u32)0);
2162
2163                 /*
2164                  * TODO: ACE's in delegations
2165                  */
2166                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2167                 WRITE32(0);
2168                 WRITE32(0);
2169                 WRITE32(0);   /* XXX: is NULL principal ok? */
2170                 ADJUST_ARGS();
2171                 break;
2172         default:
2173                 BUG();
2174         }
2175         /* XXX save filehandle here */
2176 out:
2177         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2178 }
2179
2180 static void
2181 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2182 {
2183         ENCODE_SEQID_OP_HEAD;
2184
2185         if (!nfserr) {
2186                 RESERVE_SPACE(sizeof(stateid_t));
2187                 WRITE32(oc->oc_resp_stateid.si_generation);
2188                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2189                 ADJUST_ARGS();
2190         }
2191
2192         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2193 }
2194
2195 static void
2196 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2197 {
2198         ENCODE_SEQID_OP_HEAD;
2199
2200         if (!nfserr) {
2201                 RESERVE_SPACE(sizeof(stateid_t));
2202                 WRITE32(od->od_stateid.si_generation);
2203                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2204                 ADJUST_ARGS();
2205         }
2206
2207         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2208 }
2209
2210 static __be32
2211 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2212                   struct nfsd4_read *read)
2213 {
2214         u32 eof;
2215         int v, pn;
2216         unsigned long maxcount;
2217         long len;
2218         ENCODE_HEAD;
2219
2220         if (nfserr)
2221                 return nfserr;
2222         if (resp->xbuf->page_len)
2223                 return nfserr_resource;
2224
2225         RESERVE_SPACE(8); /* eof flag and byte count */
2226
2227         maxcount = svc_max_payload(resp->rqstp);
2228         if (maxcount > read->rd_length)
2229                 maxcount = read->rd_length;
2230
2231         len = maxcount;
2232         v = 0;
2233         while (len > 0) {
2234                 pn = resp->rqstp->rq_resused++;
2235                 resp->rqstp->rq_vec[v].iov_base =
2236                         page_address(resp->rqstp->rq_respages[pn]);
2237                 resp->rqstp->rq_vec[v].iov_len =
2238                         len < PAGE_SIZE ? len : PAGE_SIZE;
2239                 v++;
2240                 len -= PAGE_SIZE;
2241         }
2242         read->rd_vlen = v;
2243
2244         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2245                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2246                         &maxcount);
2247
2248         if (nfserr == nfserr_symlink)
2249                 nfserr = nfserr_inval;
2250         if (nfserr)
2251                 return nfserr;
2252         eof = (read->rd_offset + maxcount >=
2253                read->rd_fhp->fh_dentry->d_inode->i_size);
2254
2255         WRITE32(eof);
2256         WRITE32(maxcount);
2257         ADJUST_ARGS();
2258         resp->xbuf->head[0].iov_len = (char*)p
2259                                         - (char*)resp->xbuf->head[0].iov_base;
2260         resp->xbuf->page_len = maxcount;
2261
2262         /* Use rest of head for padding and remaining ops: */
2263         resp->xbuf->tail[0].iov_base = p;
2264         resp->xbuf->tail[0].iov_len = 0;
2265         if (maxcount&3) {
2266                 RESERVE_SPACE(4);
2267                 WRITE32(0);
2268                 resp->xbuf->tail[0].iov_base += maxcount&3;
2269                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2270                 ADJUST_ARGS();
2271         }
2272         return 0;
2273 }
2274
2275 static __be32
2276 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2277 {
2278         int maxcount;
2279         char *page;
2280         ENCODE_HEAD;
2281
2282         if (nfserr)
2283                 return nfserr;
2284         if (resp->xbuf->page_len)
2285                 return nfserr_resource;
2286
2287         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2288
2289         maxcount = PAGE_SIZE;
2290         RESERVE_SPACE(4);
2291
2292         /*
2293          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2294          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2295          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2296          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2297          */
2298         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2299         if (nfserr == nfserr_isdir)
2300                 return nfserr_inval;
2301         if (nfserr)
2302                 return nfserr;
2303
2304         WRITE32(maxcount);
2305         ADJUST_ARGS();
2306         resp->xbuf->head[0].iov_len = (char*)p
2307                                 - (char*)resp->xbuf->head[0].iov_base;
2308         resp->xbuf->page_len = maxcount;
2309
2310         /* Use rest of head for padding and remaining ops: */
2311         resp->xbuf->tail[0].iov_base = p;
2312         resp->xbuf->tail[0].iov_len = 0;
2313         if (maxcount&3) {
2314                 RESERVE_SPACE(4);
2315                 WRITE32(0);
2316                 resp->xbuf->tail[0].iov_base += maxcount&3;
2317                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2318                 ADJUST_ARGS();
2319         }
2320         return 0;
2321 }
2322
2323 static __be32
2324 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2325 {
2326         int maxcount;
2327         loff_t offset;
2328         __be32 *page, *savep, *tailbase;
2329         ENCODE_HEAD;
2330
2331         if (nfserr)
2332                 return nfserr;
2333         if (resp->xbuf->page_len)
2334                 return nfserr_resource;
2335
2336         RESERVE_SPACE(8);  /* verifier */
2337         savep = p;
2338
2339         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2340         WRITE32(0);
2341         WRITE32(0);
2342         ADJUST_ARGS();
2343         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2344         tailbase = p;
2345
2346         maxcount = PAGE_SIZE;
2347         if (maxcount > readdir->rd_maxcount)
2348                 maxcount = readdir->rd_maxcount;
2349
2350         /*
2351          * Convert from bytes to words, account for the two words already
2352          * written, make sure to leave two words at the end for the next
2353          * pointer and eof field.
2354          */
2355         maxcount = (maxcount >> 2) - 4;
2356         if (maxcount < 0) {
2357                 nfserr =  nfserr_toosmall;
2358                 goto err_no_verf;
2359         }
2360
2361         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2362         readdir->common.err = 0;
2363         readdir->buflen = maxcount;
2364         readdir->buffer = page;
2365         readdir->offset = NULL;
2366
2367         offset = readdir->rd_cookie;
2368         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2369                               &offset,
2370                               &readdir->common, nfsd4_encode_dirent);
2371         if (nfserr == nfs_ok &&
2372             readdir->common.err == nfserr_toosmall &&
2373             readdir->buffer == page)
2374                 nfserr = nfserr_toosmall;
2375         if (nfserr == nfserr_symlink)
2376                 nfserr = nfserr_notdir;
2377         if (nfserr)
2378                 goto err_no_verf;
2379
2380         if (readdir->offset)
2381                 xdr_encode_hyper(readdir->offset, offset);
2382
2383         p = readdir->buffer;
2384         *p++ = 0;       /* no more entries */
2385         *p++ = htonl(readdir->common.err == nfserr_eof);
2386         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2387                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2388
2389         /* Use rest of head for padding and remaining ops: */
2390         resp->xbuf->tail[0].iov_base = tailbase;
2391         resp->xbuf->tail[0].iov_len = 0;
2392         resp->p = resp->xbuf->tail[0].iov_base;
2393         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2394
2395         return 0;
2396 err_no_verf:
2397         p = savep;
2398         ADJUST_ARGS();
2399         return nfserr;
2400 }
2401
2402 static void
2403 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2404 {
2405         ENCODE_HEAD;
2406
2407         if (!nfserr) {
2408                 RESERVE_SPACE(20);
2409                 WRITECINFO(remove->rm_cinfo);
2410                 ADJUST_ARGS();
2411         }
2412 }
2413
2414 static void
2415 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2416 {
2417         ENCODE_HEAD;
2418
2419         if (!nfserr) {
2420                 RESERVE_SPACE(40);
2421                 WRITECINFO(rename->rn_sinfo);
2422                 WRITECINFO(rename->rn_tinfo);
2423                 ADJUST_ARGS();
2424         }
2425 }
2426
2427 /*
2428  * The SETATTR encode routine is special -- it always encodes a bitmap,
2429  * regardless of the error status.
2430  */
2431 static void
2432 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2433 {
2434         ENCODE_HEAD;
2435
2436         RESERVE_SPACE(12);
2437         if (nfserr) {
2438                 WRITE32(2);
2439                 WRITE32(0);
2440                 WRITE32(0);
2441         }
2442         else {
2443                 WRITE32(2);
2444                 WRITE32(setattr->sa_bmval[0]);
2445                 WRITE32(setattr->sa_bmval[1]);
2446         }
2447         ADJUST_ARGS();
2448 }
2449
2450 static void
2451 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2452 {
2453         ENCODE_HEAD;
2454
2455         if (!nfserr) {
2456                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2457                 WRITEMEM(&scd->se_clientid, 8);
2458                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2459                 ADJUST_ARGS();
2460         }
2461         else if (nfserr == nfserr_clid_inuse) {
2462                 RESERVE_SPACE(8);
2463                 WRITE32(0);
2464                 WRITE32(0);
2465                 ADJUST_ARGS();
2466         }
2467 }
2468
2469 static void
2470 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2471 {
2472         ENCODE_HEAD;
2473
2474         if (!nfserr) {
2475                 RESERVE_SPACE(16);
2476                 WRITE32(write->wr_bytes_written);
2477                 WRITE32(write->wr_how_written);
2478                 WRITEMEM(write->wr_verifier.data, 8);
2479                 ADJUST_ARGS();
2480         }
2481 }
2482
2483 void
2484 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2485 {
2486         __be32 *statp;
2487         ENCODE_HEAD;
2488
2489         RESERVE_SPACE(8);
2490         WRITE32(op->opnum);
2491         statp = p++;    /* to be backfilled at the end */
2492         ADJUST_ARGS();
2493
2494         switch (op->opnum) {
2495         case OP_ACCESS:
2496                 nfsd4_encode_access(resp, op->status, &op->u.access);
2497                 break;
2498         case OP_CLOSE:
2499                 nfsd4_encode_close(resp, op->status, &op->u.close);
2500                 break;
2501         case OP_COMMIT:
2502                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2503                 break;
2504         case OP_CREATE:
2505                 nfsd4_encode_create(resp, op->status, &op->u.create);
2506                 break;
2507         case OP_DELEGRETURN:
2508                 break;
2509         case OP_GETATTR:
2510                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2511                 break;
2512         case OP_GETFH:
2513                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2514                 break;
2515         case OP_LINK:
2516                 nfsd4_encode_link(resp, op->status, &op->u.link);
2517                 break;
2518         case OP_LOCK:
2519                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2520                 break;
2521         case OP_LOCKT:
2522                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2523                 break;
2524         case OP_LOCKU:
2525                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2526                 break;
2527         case OP_LOOKUP:
2528                 break;
2529         case OP_LOOKUPP:
2530                 break;
2531         case OP_NVERIFY:
2532                 break;
2533         case OP_OPEN:
2534                 nfsd4_encode_open(resp, op->status, &op->u.open);
2535                 break;
2536         case OP_OPEN_CONFIRM:
2537                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2538                 break;
2539         case OP_OPEN_DOWNGRADE:
2540                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2541                 break;
2542         case OP_PUTFH:
2543                 break;
2544         case OP_PUTROOTFH:
2545                 break;
2546         case OP_READ:
2547                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2548                 break;
2549         case OP_READDIR:
2550                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2551                 break;
2552         case OP_READLINK:
2553                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2554                 break;
2555         case OP_REMOVE:
2556                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2557                 break;
2558         case OP_RENAME:
2559                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2560                 break;
2561         case OP_RENEW:
2562                 break;
2563         case OP_RESTOREFH:
2564                 break;
2565         case OP_SAVEFH:
2566                 break;
2567         case OP_SETATTR:
2568                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2569                 break;
2570         case OP_SETCLIENTID:
2571                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2572                 break;
2573         case OP_SETCLIENTID_CONFIRM:
2574                 break;
2575         case OP_VERIFY:
2576                 break;
2577         case OP_WRITE:
2578                 nfsd4_encode_write(resp, op->status, &op->u.write);
2579                 break;
2580         case OP_RELEASE_LOCKOWNER:
2581                 break;
2582         default:
2583                 break;
2584         }
2585
2586         /*
2587          * Note: We write the status directly, instead of using WRITE32(),
2588          * since it is already in network byte order.
2589          */
2590         *statp = op->status;
2591 }
2592
2593 /*
2594  * Encode the reply stored in the stateowner reply cache
2595  *
2596  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2597  * previously sent already encoded operation.
2598  *
2599  * called with nfs4_lock_state() held
2600  */
2601 void
2602 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2603 {
2604         ENCODE_HEAD;
2605         struct nfs4_replay *rp = op->replay;
2606
2607         BUG_ON(!rp);
2608
2609         RESERVE_SPACE(8);
2610         WRITE32(op->opnum);
2611         *p++ = rp->rp_status;  /* already xdr'ed */
2612         ADJUST_ARGS();
2613
2614         RESERVE_SPACE(rp->rp_buflen);
2615         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2616         ADJUST_ARGS();
2617 }
2618
2619 /*
2620  * END OF "GENERIC" ENCODE ROUTINES.
2621  */
2622
2623 int
2624 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2625 {
2626         return xdr_ressize_check(rqstp, p);
2627 }
2628
2629 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2630 {
2631         if (args->ops != args->iops) {
2632                 kfree(args->ops);
2633                 args->ops = args->iops;
2634         }
2635         kfree(args->tmpp);
2636         args->tmpp = NULL;
2637         while (args->to_free) {
2638                 struct tmpbuf *tb = args->to_free;
2639                 args->to_free = tb->next;
2640                 tb->release(tb->buf);
2641                 kfree(tb);
2642         }
2643 }
2644
2645 int
2646 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2647 {
2648         __be32 status;
2649
2650         args->p = p;
2651         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2652         args->pagelist = rqstp->rq_arg.pages;
2653         args->pagelen = rqstp->rq_arg.page_len;
2654         args->tmpp = NULL;
2655         args->to_free = NULL;
2656         args->ops = args->iops;
2657         args->rqstp = rqstp;
2658
2659         status = nfsd4_decode_compound(args);
2660         if (status) {
2661                 nfsd4_release_compoundargs(args);
2662         }
2663         return !status;
2664 }
2665
2666 int
2667 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2668 {
2669         /*
2670          * All that remains is to write the tag and operation count...
2671          */
2672         struct kvec *iov;
2673         p = resp->tagp;
2674         *p++ = htonl(resp->taglen);
2675         memcpy(p, resp->tag, resp->taglen);
2676         p += XDR_QUADLEN(resp->taglen);
2677         *p++ = htonl(resp->opcnt);
2678
2679         if (rqstp->rq_res.page_len)
2680                 iov = &rqstp->rq_res.tail[0];
2681         else
2682                 iov = &rqstp->rq_res.head[0];
2683         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2684         BUG_ON(iov->iov_len > PAGE_SIZE);
2685         return 1;
2686 }
2687
2688 /*
2689  * Local variables:
2690  *  c-basic-offset: 8
2691  * End:
2692  */