fs/nfsd/nfs4xdr.c

   1 /*
   2  *  fs/nfs/nfs4xdr.c
   3  *
   4  *  Server-side XDR for NFSv4
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * TODO: Neil Brown made the following observation:  We currently
  38  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  39  * never release any of that until the request is complete.
  40  * It would be good to calculate a new maximum response size while
  41  * decoding the COMPOUND, and call svc_reserve with this number
  42  * at the end of nfs4svc_decode_compoundargs.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/smp.h>
  47 #include <linux/smp_lock.h>
  48 #include <linux/fs.h>
  49 #include <linux/namei.h>
  50 #include <linux/vfs.h>
  51 #include <linux/sunrpc/xdr.h>
  52 #include <linux/sunrpc/svc.h>
  53 #include <linux/sunrpc/clnt.h>
  54 #include <linux/nfsd/nfsd.h>
  55 #include <linux/nfsd/state.h>
  56 #include <linux/nfsd/xdr4.h>
  57 #include <linux/nfsd_idmap.h>
  58 #include <linux/nfs4.h>
  59 #include <linux/nfs4_acl.h>
  60
  61 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  62
  63 static const char utf8_byte_len[256] = {
  64         1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  65         1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  66         1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  67         1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  68         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  69         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  70         0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
  71         3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, 4,4,4,4,4,4,4,4,5,5,5,5,6,6,0,0
  72 };
  73
  74 static inline int
  75 is_legal_utf8_sequence(unsigned char *source, int length)
  76 {
  77         unsigned char *ptr;
  78         unsigned char c;
  79
  80         if (length==1) return 1;
  81
  82         /* Check for overlong sequence, and check second byte */
  83         c = *(source + 1);
  84         switch (*source) {
  85         case 0xE0: /* 3 bytes */
  86                 if ( c < 0xA0 ) return 0;
  87                 break;
  88         case 0xF0: /* 4 bytes */
  89                 if ( c < 0x90 ) return 0;
  90                 break;
  91         case 0xF8: /* 5 bytes */
  92                 if ( c < 0xC8 ) return 0;
  93                 break;
  94         case 0xFC: /* 6 bytes */
  95                 if ( c < 0x84 ) return 0;
  96                 break;
  97         default:
  98                 if ( (c & 0xC0) != 0x80) return 0;
  99         }
 100
 101         /* Check that trailing bytes look like 10xxxxxx */
 102         for (ptr = source++ + length - 1; ptr>source; ptr--)
 103                 if ( ((*ptr) & 0xC0) != 0x80 ) return 0;
 104         return 1;
 105 }
 106
 107 /* This does some screening on disallowed unicode characters.  It is NOT
 108  * comprehensive.
 109  */
 110 static int
 111 is_allowed_utf8_char(unsigned char *source, int length)
 112 {
 113         /* We assume length and source point to a valid utf8 sequence */
 114         unsigned char c;
 115
 116         /* Disallow F0000 and up (in utf8, F3B08080) */
 117         if (*source > 0xF3 ) return 0;
 118         c = *(source + 1);
 119         switch (*source) {
 120         case 0xF3:
 121                 if (c >= 0xB0) return 0;
 122                 break;
 123         /* Disallow D800-F8FF (in utf8, EDA080-EFA3BF */
 124         case 0xED:
 125                 if (c >= 0xA0) return 0;
 126                 break;
 127         case 0xEE:
 128                 return 0;
 129                 break;
 130         case 0xEF:
 131                 if (c <= 0xA3) return 0;
 132         /* Disallow FFF9-FFFF (EFBFB9-EFBFBF) */
 133                 if (c==0xBF)
 134                         /* Don't need to check <=0xBF, since valid utf8 */
 135                         if ( *(source+2) >= 0xB9) return 0;
 136                 break;
 137         }
 138         return 1;
 139 }
 140
 141 /* This routine should really check to see that the proper stringprep
 142  * mappings have been applied.  Instead, we do a simple screen of some
 143  * of the more obvious illegal values by calling is_allowed_utf8_char.
 144  * This will allow many illegal strings through, but if a client behaves,
 145  * it will get full functionality.  The other option (apart from full
 146  * stringprep checking) is to limit everything to an easily handled subset,
 147  * such as 7-bit ascii.
 148  *
 149  * Note - currently calling routines ignore return value except as boolean.
 150  */
 151 static int
 152 check_utf8(char *str, int len)
 153 {
 154         unsigned char *chunk, *sourceend;
 155         int chunklen;
 156
 157         chunk = str;
 158         sourceend = str + len;
 159
 160         while (chunk < sourceend) {
 161                 chunklen = utf8_byte_len[*chunk];
 162                 if (!chunklen)
 163                         return nfserr_inval;
 164                 if (chunk + chunklen > sourceend)
 165                         return nfserr_inval;
 166                 if (!is_legal_utf8_sequence(chunk, chunklen))
 167                         return nfserr_inval;
 168                 if (!is_allowed_utf8_char(chunk, chunklen))
 169                         return nfserr_inval;
 170                 if ( (chunklen==1) && (!*chunk) )
 171                         return nfserr_inval; /* Disallow embedded nulls */
 172                 chunk += chunklen;
 173         }
 174
 175         return 0;
 176 }
 177
 178 static int
 179 check_filename(char *str, int len, int err)
 180 {
 181         int i;
 182
 183         if (len == 0)
 184                 return nfserr_inval;
 185         if (isdotent(str, len))
 186                 return err;
 187         for (i = 0; i < len; i++)
 188                 if (str[i] == '/')
 189                         return err;
 190         return check_utf8(str, len);
 191 }
 192
 193 /*
 194  * START OF "GENERIC" DECODE ROUTINES.
 195  *   These may look a little ugly since they are imported from a "generic"
 196  * set of XDR encode/decode routines which are intended to be shared by
 197  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
 198  *
 199  * If the pain of reading these is too great, it should be a straightforward
 200  * task to translate them into Linux-specific versions which are more
 201  * consistent with the style used in NFSv2/v3...
 202  */
 203 #define DECODE_HEAD                             \
 204         u32 *p;                                 \
 205         int status
 206 #define DECODE_TAIL                             \
 207         status = 0;                             \
 208 out:                                            \
 209         return status;                          \
 210 xdr_error:                                      \
 211         printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 212         status = nfserr_bad_xdr;                \
 213         goto out
 214
 215 #define READ32(x)         (x) = ntohl(*p++)
 216 #define READ64(x)         do {                  \
 217         (x) = (u64)ntohl(*p++) << 32;           \
 218         (x) |= ntohl(*p++);                     \
 219 } while (0)
 220 #define READTIME(x)       do {                  \
 221         p++;                                    \
 222         (x) = ntohl(*p++);                      \
 223         p++;                                    \
 224 } while (0)
 225 #define READMEM(x,nbytes) do {                  \
 226         x = (char *)p;                          \
 227         p += XDR_QUADLEN(nbytes);               \
 228 } while (0)
 229 #define SAVEMEM(x,nbytes) do {                  \
 230         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 231                 savemem(argp, p, nbytes) :      \
 232                 (char *)p)) {                   \
 233                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 234                 goto xdr_error;                 \
 235                 }                               \
 236         p += XDR_QUADLEN(nbytes);               \
 237 } while (0)
 238 #define COPYMEM(x,nbytes) do {                  \
 239         memcpy((x), p, nbytes);                 \
 240         p += XDR_QUADLEN(nbytes);               \
 241 } while (0)
 242
 243 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 244 #define READ_BUF(nbytes)  do {                  \
 245         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 246                 p = argp->p;                    \
 247                 argp->p += XDR_QUADLEN(nbytes); \
 248         } else if (!(p = read_buf(argp, nbytes))) { \
 249                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 250                 goto xdr_error;                 \
 251         }                                       \
 252 } while (0)
 253
 254 u32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
 255 {
 256         /* We want more bytes than seem to be available.
 257          * Maybe we need a new page, maybe we have just run out
 258          */
 259         int avail = (char*)argp->end - (char*)argp->p;
 260         u32 *p;
 261         if (avail + argp->pagelen < nbytes)
 262                 return NULL;
 263         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 264                 return NULL;
 265         /* ok, we can do it with the current plus the next page */
 266         if (nbytes <= sizeof(argp->tmp))
 267                 p = argp->tmp;
 268         else {
 269                 if (argp->tmpp)
 270                         kfree(argp->tmpp);
 271                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 272                 if (!p)
 273                         return NULL;
 274
 275         }
 276         memcpy(p, argp->p, avail);
 277         /* step to next page */
 278         argp->p = page_address(argp->pagelist[0]);
 279         argp->pagelist++;
 280         if (argp->pagelen < PAGE_SIZE) {
 281                 argp->end = p + (argp->pagelen>>2);
 282                 argp->pagelen = 0;
 283         } else {
 284                 argp->end = p + (PAGE_SIZE>>2);
 285                 argp->pagelen -= PAGE_SIZE;
 286         }
 287         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 288         argp->p += XDR_QUADLEN(nbytes - avail);
 289         return p;
 290 }
 291
 292 static int
 293 defer_free(struct nfsd4_compoundargs *argp,
 294                 void (*release)(const void *), void *p)
 295 {
 296         struct tmpbuf *tb;
 297
 298         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 299         if (!tb)
 300                 return -ENOMEM;
 301         tb->buf = p;
 302         tb->release = release;
 303         tb->next = argp->to_free;
 304         argp->to_free = tb;
 305         return 0;
 306 }
 307
 308 char *savemem(struct nfsd4_compoundargs *argp, u32 *p, int nbytes)
 309 {
 310         void *new = NULL;
 311         if (p == argp->tmp) {
 312                 new = kmalloc(nbytes, GFP_KERNEL);
 313                 if (!new) return NULL;
 314                 p = new;
 315                 memcpy(p, argp->tmp, nbytes);
 316         } else {
 317                 if (p != argp->tmpp)
 318                         BUG();
 319                 argp->tmpp = NULL;
 320         }
 321         if (defer_free(argp, kfree, p)) {
 322                 kfree(new);
 323                 return NULL;
 324         } else
 325                 return (char *)p;
 326 }
 327
 328
 329 static int
 330 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 331 {
 332         u32 bmlen;
 333         DECODE_HEAD;
 334
 335         bmval[0] = 0;
 336         bmval[1] = 0;
 337
 338         READ_BUF(4);
 339         READ32(bmlen);
 340         if (bmlen > 1000)
 341                 goto xdr_error;
 342
 343         READ_BUF(bmlen << 2);
 344         if (bmlen > 0)
 345                 READ32(bmval[0]);
 346         if (bmlen > 1)
 347                 READ32(bmval[1]);
 348
 349         DECODE_TAIL;
 350 }
 351
 352 static int
 353 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 354     struct nfs4_acl **acl)
 355 {
 356         int expected_len, len = 0;
 357         u32 dummy32;
 358         char *buf;
 359
 360         DECODE_HEAD;
 361         iattr->ia_valid = 0;
 362         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 363                 return status;
 364
 365         /*
 366          * According to spec, unsupported attributes return ERR_NOTSUPP;
 367          * read-only attributes return ERR_INVAL.
 368          */
 369         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 370                 return nfserr_attrnotsupp;
 371         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 372                 return nfserr_inval;
 373
 374         READ_BUF(4);
 375         READ32(expected_len);
 376
 377         if (bmval[0] & FATTR4_WORD0_SIZE) {
 378                 READ_BUF(8);
 379                 len += 8;
 380                 READ64(iattr->ia_size);
 381                 iattr->ia_valid |= ATTR_SIZE;
 382         }
 383         if (bmval[0] & FATTR4_WORD0_ACL) {
 384                 int nace, i;
 385                 struct nfs4_ace ace;
 386
 387                 READ_BUF(4); len += 4;
 388                 READ32(nace);
 389
 390                 *acl = nfs4_acl_new();
 391                 if (*acl == NULL) {
 392                         status = -ENOMEM;
 393                         goto out_nfserr;
 394                 }
 395                 defer_free(argp, (void (*)(const void *))nfs4_acl_free, *acl);
 396
 397                 for (i = 0; i < nace; i++) {
 398                         READ_BUF(16); len += 16;
 399                         READ32(ace.type);
 400                         READ32(ace.flag);
 401                         READ32(ace.access_mask);
 402                         READ32(dummy32);
 403                         READ_BUF(dummy32);
 404                         len += XDR_QUADLEN(dummy32) << 2;
 405                         READMEM(buf, dummy32);
 406                         if (check_utf8(buf, dummy32))
 407                                 return nfserr_inval;
 408                         ace.whotype = nfs4_acl_get_whotype(buf, dummy32);
 409                         status = 0;
 410                         if (ace.whotype != NFS4_ACL_WHO_NAMED)
 411                                 ace.who = 0;
 412                         else if (ace.flag & NFS4_ACE_IDENTIFIER_GROUP)
 413                                 status = nfsd_map_name_to_gid(argp->rqstp,
 414                                                 buf, dummy32, &ace.who);
 415                         else
 416                                 status = nfsd_map_name_to_uid(argp->rqstp,
 417                                                 buf, dummy32, &ace.who);
 418                         if (status)
 419                                 goto out_nfserr;
 420                         if (nfs4_acl_add_ace(*acl, ace.type, ace.flag,
 421                                  ace.access_mask, ace.whotype, ace.who) != 0) {
 422                                 status = -ENOMEM;
 423                                 goto out_nfserr;
 424                         }
 425                 }
 426         } else
 427                 *acl = NULL;
 428         if (bmval[1] & FATTR4_WORD1_MODE) {
 429                 READ_BUF(4);
 430                 len += 4;
 431                 READ32(iattr->ia_mode);
 432                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 433                 iattr->ia_valid |= ATTR_MODE;
 434         }
 435         if (bmval[1] & FATTR4_WORD1_OWNER) {
 436                 READ_BUF(4);
 437                 len += 4;
 438                 READ32(dummy32);
 439                 READ_BUF(dummy32);
 440                 len += (XDR_QUADLEN(dummy32) << 2);
 441                 READMEM(buf, dummy32);
 442                 if (check_utf8(buf, dummy32))
 443                         return nfserr_inval;
 444                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 445                         goto out_nfserr;
 446                 iattr->ia_valid |= ATTR_UID;
 447         }
 448         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 449                 READ_BUF(4);
 450                 len += 4;
 451                 READ32(dummy32);
 452                 READ_BUF(dummy32);
 453                 len += (XDR_QUADLEN(dummy32) << 2);
 454                 READMEM(buf, dummy32);
 455                 if (check_utf8(buf, dummy32))
 456                         return nfserr_inval;
 457                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 458                         goto out_nfserr;
 459                 iattr->ia_valid |= ATTR_GID;
 460         }
 461         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 462                 READ_BUF(4);
 463                 len += 4;
 464                 READ32(dummy32);
 465                 switch (dummy32) {
 466                 case NFS4_SET_TO_CLIENT_TIME:
 467                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 468                            all 32 bits of 'nseconds'. */
 469                         READ_BUF(12);
 470                         len += 12;
 471                         READ32(dummy32);
 472                         if (dummy32)
 473                                 return nfserr_inval;
 474                         READ32(iattr->ia_atime.tv_sec);
 475                         READ32(iattr->ia_atime.tv_nsec);
 476                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 477                                 return nfserr_inval;
 478                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 479                         break;
 480                 case NFS4_SET_TO_SERVER_TIME:
 481                         iattr->ia_valid |= ATTR_ATIME;
 482                         break;
 483                 default:
 484                         goto xdr_error;
 485                 }
 486         }
 487         if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
 488                 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 489                    all 32 bits of 'nseconds'. */
 490                 READ_BUF(12);
 491                 len += 12;
 492                 READ32(dummy32);
 493                 if (dummy32)
 494                         return nfserr_inval;
 495                 READ32(iattr->ia_ctime.tv_sec);
 496                 READ32(iattr->ia_ctime.tv_nsec);
 497                 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
 498                         return nfserr_inval;
 499                 iattr->ia_valid |= ATTR_CTIME;
 500         }
 501         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 502                 READ_BUF(4);
 503                 len += 4;
 504                 READ32(dummy32);
 505                 switch (dummy32) {
 506                 case NFS4_SET_TO_CLIENT_TIME:
 507                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 508                            all 32 bits of 'nseconds'. */
 509                         READ_BUF(12);
 510                         len += 12;
 511                         READ32(dummy32);
 512                         if (dummy32)
 513                                 return nfserr_inval;
 514                         READ32(iattr->ia_mtime.tv_sec);
 515                         READ32(iattr->ia_mtime.tv_nsec);
 516                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 517                                 return nfserr_inval;
 518                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 519                         break;
 520                 case NFS4_SET_TO_SERVER_TIME:
 521                         iattr->ia_valid |= ATTR_MTIME;
 522                         break;
 523                 default:
 524                         goto xdr_error;
 525                 }
 526         }
 527         if (len != expected_len)
 528                 goto xdr_error;
 529
 530         DECODE_TAIL;
 531
 532 out_nfserr:
 533         status = nfserrno(status);
 534         goto out;
 535 }
 536
 537 static int
 538 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 539 {
 540         DECODE_HEAD;
 541
 542         READ_BUF(4);
 543         READ32(access->ac_req_access);
 544
 545         DECODE_TAIL;
 546 }
 547
 548 static int
 549 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 550 {
 551         DECODE_HEAD;
 552
 553         close->cl_stateowner = NULL;
 554         READ_BUF(4 + sizeof(stateid_t));
 555         READ32(close->cl_seqid);
 556         READ32(close->cl_stateid.si_generation);
 557         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
 558
 559         DECODE_TAIL;
 560 }
 561
 562
 563 static int
 564 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 565 {
 566         DECODE_HEAD;
 567
 568         READ_BUF(12);
 569         READ64(commit->co_offset);
 570         READ32(commit->co_count);
 571
 572         DECODE_TAIL;
 573 }
 574
 575 static int
 576 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 577 {
 578         DECODE_HEAD;
 579
 580         READ_BUF(4);
 581         READ32(create->cr_type);
 582         switch (create->cr_type) {
 583         case NF4LNK:
 584                 READ_BUF(4);
 585                 READ32(create->cr_linklen);
 586                 READ_BUF(create->cr_linklen);
 587                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 588                 if (check_utf8(create->cr_linkname, create->cr_linklen))
 589                         return nfserr_inval;
 590                 break;
 591         case NF4BLK:
 592         case NF4CHR:
 593                 READ_BUF(8);
 594                 READ32(create->cr_specdata1);
 595                 READ32(create->cr_specdata2);
 596                 break;
 597         case NF4SOCK:
 598         case NF4FIFO:
 599         case NF4DIR:
 600         default:
 601                 break;
 602         }
 603
 604         READ_BUF(4);
 605         READ32(create->cr_namelen);
 606         READ_BUF(create->cr_namelen);
 607         SAVEMEM(create->cr_name, create->cr_namelen);
 608         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 609                 return status;
 610
 611         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 612                 goto out;
 613
 614         DECODE_TAIL;
 615 }
 616
 617 static inline int
 618 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 619 {
 620         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 621 }
 622
 623 static int
 624 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 625 {
 626         DECODE_HEAD;
 627
 628         READ_BUF(4);
 629         READ32(link->li_namelen);
 630         READ_BUF(link->li_namelen);
 631         SAVEMEM(link->li_name, link->li_namelen);
 632         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 633                 return status;
 634
 635         DECODE_TAIL;
 636 }
 637
 638 static int
 639 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 640 {
 641         DECODE_HEAD;
 642
 643         lock->lk_stateowner = NULL;
 644         /*
 645         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 646         */
 647         READ_BUF(28);
 648         READ32(lock->lk_type);
 649         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 650                 goto xdr_error;
 651         READ32(lock->lk_reclaim);
 652         READ64(lock->lk_offset);
 653         READ64(lock->lk_length);
 654         READ32(lock->lk_is_new);
 655
 656         if (lock->lk_is_new) {
 657                 READ_BUF(36);
 658                 READ32(lock->lk_new_open_seqid);
 659                 READ32(lock->lk_new_open_stateid.si_generation);
 660
 661                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
 662                 READ32(lock->lk_new_lock_seqid);
 663                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 664                 READ32(lock->lk_new_owner.len);
 665                 READ_BUF(lock->lk_new_owner.len);
 666                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 667         } else {
 668                 READ_BUF(20);
 669                 READ32(lock->lk_old_lock_stateid.si_generation);
 670                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
 671                 READ32(lock->lk_old_lock_seqid);
 672         }
 673
 674         DECODE_TAIL;
 675 }
 676
 677 static int
 678 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 679 {
 680         DECODE_HEAD;
 681
 682         READ_BUF(32);
 683         READ32(lockt->lt_type);
 684         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 685                 goto xdr_error;
 686         READ64(lockt->lt_offset);
 687         READ64(lockt->lt_length);
 688         COPYMEM(&lockt->lt_clientid, 8);
 689         READ32(lockt->lt_owner.len);
 690         READ_BUF(lockt->lt_owner.len);
 691         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 692
 693         DECODE_TAIL;
 694 }
 695
 696 static int
 697 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 698 {
 699         DECODE_HEAD;
 700
 701         locku->lu_stateowner = NULL;
 702         READ_BUF(24 + sizeof(stateid_t));
 703         READ32(locku->lu_type);
 704         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 705                 goto xdr_error;
 706         READ32(locku->lu_seqid);
 707         READ32(locku->lu_stateid.si_generation);
 708         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
 709         READ64(locku->lu_offset);
 710         READ64(locku->lu_length);
 711
 712         DECODE_TAIL;
 713 }
 714
 715 static int
 716 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 717 {
 718         DECODE_HEAD;
 719
 720         READ_BUF(4);
 721         READ32(lookup->lo_len);
 722         READ_BUF(lookup->lo_len);
 723         SAVEMEM(lookup->lo_name, lookup->lo_len);
 724         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 725                 return status;
 726
 727         DECODE_TAIL;
 728 }
 729
 730 static int
 731 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 732 {
 733         DECODE_HEAD;
 734
 735         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 736         open->op_iattr.ia_valid = 0;
 737         open->op_stateowner = NULL;
 738
 739         /* seqid, share_access, share_deny, clientid, ownerlen */
 740         READ_BUF(16 + sizeof(clientid_t));
 741         READ32(open->op_seqid);
 742         READ32(open->op_share_access);
 743         READ32(open->op_share_deny);
 744         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 745         READ32(open->op_owner.len);
 746
 747         /* owner, open_flag */
 748         READ_BUF(open->op_owner.len + 4);
 749         SAVEMEM(open->op_owner.data, open->op_owner.len);
 750         READ32(open->op_create);
 751         switch (open->op_create) {
 752         case NFS4_OPEN_NOCREATE:
 753                 break;
 754         case NFS4_OPEN_CREATE:
 755                 READ_BUF(4);
 756                 READ32(open->op_createmode);
 757                 switch (open->op_createmode) {
 758                 case NFS4_CREATE_UNCHECKED:
 759                 case NFS4_CREATE_GUARDED:
 760                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 761                                 goto out;
 762                         break;
 763                 case NFS4_CREATE_EXCLUSIVE:
 764                         READ_BUF(8);
 765                         COPYMEM(open->op_verf.data, 8);
 766                         break;
 767                 default:
 768                         goto xdr_error;
 769                 }
 770                 break;
 771         default:
 772                 goto xdr_error;
 773         }
 774
 775         /* open_claim */
 776         READ_BUF(4);
 777         READ32(open->op_claim_type);
 778         switch (open->op_claim_type) {
 779         case NFS4_OPEN_CLAIM_NULL:
 780         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 781                 READ_BUF(4);
 782                 READ32(open->op_fname.len);
 783                 READ_BUF(open->op_fname.len);
 784                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 785                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 786                         return status;
 787                 break;
 788         case NFS4_OPEN_CLAIM_PREVIOUS:
 789                 READ_BUF(4);
 790                 READ32(open->op_delegate_type);
 791                 break;
 792         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 793                 READ_BUF(sizeof(delegation_stateid_t) + 4);
 794                 COPYMEM(&open->op_delegate_stateid, sizeof(delegation_stateid_t));
 795                 READ32(open->op_fname.len);
 796                 READ_BUF(open->op_fname.len);
 797                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 798                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 799                         return status;
 800                 break;
 801         default:
 802                 goto xdr_error;
 803         }
 804
 805         DECODE_TAIL;
 806 }
 807
 808 static int
 809 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 810 {
 811         DECODE_HEAD;
 812
 813         open_conf->oc_stateowner = NULL;
 814         READ_BUF(4 + sizeof(stateid_t));
 815         READ32(open_conf->oc_req_stateid.si_generation);
 816         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
 817         READ32(open_conf->oc_seqid);
 818
 819         DECODE_TAIL;
 820 }
 821
 822 static int
 823 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 824 {
 825         DECODE_HEAD;
 826
 827         open_down->od_stateowner = NULL;
 828         READ_BUF(4 + sizeof(stateid_t));
 829         READ32(open_down->od_stateid.si_generation);
 830         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
 831         READ32(open_down->od_seqid);
 832         READ32(open_down->od_share_access);
 833         READ32(open_down->od_share_deny);
 834
 835         DECODE_TAIL;
 836 }
 837
 838 static int
 839 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 840 {
 841         DECODE_HEAD;
 842
 843         READ_BUF(4);
 844         READ32(putfh->pf_fhlen);
 845         if (putfh->pf_fhlen > NFS4_FHSIZE)
 846                 goto xdr_error;
 847         READ_BUF(putfh->pf_fhlen);
 848         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 849
 850         DECODE_TAIL;
 851 }
 852
 853 static int
 854 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 855 {
 856         DECODE_HEAD;
 857
 858         READ_BUF(sizeof(stateid_t) + 12);
 859         READ32(read->rd_stateid.si_generation);
 860         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
 861         READ64(read->rd_offset);
 862         READ32(read->rd_length);
 863
 864         DECODE_TAIL;
 865 }
 866
 867 static int
 868 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 869 {
 870         DECODE_HEAD;
 871
 872         READ_BUF(24);
 873         READ64(readdir->rd_cookie);
 874         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 875         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 876         READ32(readdir->rd_maxcount);
 877         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 878                 goto out;
 879
 880         DECODE_TAIL;
 881 }
 882
 883 static int
 884 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 885 {
 886         DECODE_HEAD;
 887
 888         READ_BUF(4);
 889         READ32(remove->rm_namelen);
 890         READ_BUF(remove->rm_namelen);
 891         SAVEMEM(remove->rm_name, remove->rm_namelen);
 892         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 893                 return status;
 894
 895         DECODE_TAIL;
 896 }
 897
 898 static int
 899 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 900 {
 901         DECODE_HEAD;
 902
 903         READ_BUF(4);
 904         READ32(rename->rn_snamelen);
 905         READ_BUF(rename->rn_snamelen + 4);
 906         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 907         READ32(rename->rn_tnamelen);
 908         READ_BUF(rename->rn_tnamelen);
 909         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 910         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 911                 return status;
 912         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 913                 return status;
 914
 915         DECODE_TAIL;
 916 }
 917
 918 static int
 919 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 920 {
 921         DECODE_HEAD;
 922
 923         READ_BUF(sizeof(clientid_t));
 924         COPYMEM(clientid, sizeof(clientid_t));
 925
 926         DECODE_TAIL;
 927 }
 928
 929 static int
 930 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 931 {
 932         DECODE_HEAD;
 933
 934         READ_BUF(sizeof(stateid_t));
 935         READ32(setattr->sa_stateid.si_generation);
 936         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 937         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 938                 goto out;
 939
 940         DECODE_TAIL;
 941 }
 942
 943 static int
 944 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 945 {
 946         DECODE_HEAD;
 947
 948         READ_BUF(12);
 949         COPYMEM(setclientid->se_verf.data, 8);
 950         READ32(setclientid->se_namelen);
 951
 952         READ_BUF(setclientid->se_namelen + 8);
 953         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 954         READ32(setclientid->se_callback_prog);
 955         READ32(setclientid->se_callback_netid_len);
 956
 957         READ_BUF(setclientid->se_callback_netid_len + 4);
 958         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 959         READ32(setclientid->se_callback_addr_len);
 960
 961         READ_BUF(setclientid->se_callback_addr_len + 4);
 962         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 963         READ32(setclientid->se_callback_ident);
 964
 965         DECODE_TAIL;
 966 }
 967
 968 static int
 969 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 970 {
 971         DECODE_HEAD;
 972
 973         READ_BUF(8 + sizeof(nfs4_verifier));
 974         COPYMEM(&scd_c->sc_clientid, 8);
 975         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 976
 977         DECODE_TAIL;
 978 }
 979
 980 /* Also used for NVERIFY */
 981 static int
 982 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 983 {
 984 #if 0
 985         struct nfsd4_compoundargs save = {
 986                 .p = argp->p,
 987                 .end = argp->end,
 988                 .rqstp = argp->rqstp,
 989         };
 990         u32             ve_bmval[2];
 991         struct iattr    ve_iattr;           /* request */
 992         struct nfs4_acl *ve_acl;            /* request */
 993 #endif
 994         DECODE_HEAD;
 995
 996         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 997                 goto out;
 998
 999         /* For convenience's sake, we compare raw xdr'd attributes in
1000          * nfsd4_proc_verify; however we still decode here just to return
1001          * correct error in case of bad xdr. */
1002 #if 0
1003         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
1004         if (status == nfserr_inval) {
1005                 status = nfserrno(status);
1006                 goto out;
1007         }
1008 #endif
1009         READ_BUF(4);
1010         READ32(verify->ve_attrlen);
1011         READ_BUF(verify->ve_attrlen);
1012         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1013
1014         DECODE_TAIL;
1015 }
1016
1017 static int
1018 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1019 {
1020         int avail;
1021         int v;
1022         int len;
1023         DECODE_HEAD;
1024
1025         READ_BUF(sizeof(stateid_opaque_t) + 20);
1026         READ32(write->wr_stateid.si_generation);
1027         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
1028         READ64(write->wr_offset);
1029         READ32(write->wr_stable_how);
1030         if (write->wr_stable_how > 2)
1031                 goto xdr_error;
1032         READ32(write->wr_buflen);
1033
1034         /* Sorry .. no magic macros for this.. *
1035          * READ_BUF(write->wr_buflen);
1036          * SAVEMEM(write->wr_buf, write->wr_buflen);
1037          */
1038         avail = (char*)argp->end - (char*)argp->p;
1039         if (avail + argp->pagelen < write->wr_buflen) {
1040                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__);
1041                 goto xdr_error;
1042         }
1043         write->wr_vec[0].iov_base = p;
1044         write->wr_vec[0].iov_len = avail;
1045         v = 0;
1046         len = write->wr_buflen;
1047         while (len > write->wr_vec[v].iov_len) {
1048                 len -= write->wr_vec[v].iov_len;
1049                 v++;
1050                 write->wr_vec[v].iov_base = page_address(argp->pagelist[0]);
1051                 argp->pagelist++;
1052                 if (argp->pagelen >= PAGE_SIZE) {
1053                         write->wr_vec[v].iov_len = PAGE_SIZE;
1054                         argp->pagelen -= PAGE_SIZE;
1055                 } else {
1056                         write->wr_vec[v].iov_len = argp->pagelen;
1057                         argp->pagelen -= len;
1058                 }
1059         }
1060         argp->end = (u32*) (write->wr_vec[v].iov_base + write->wr_vec[v].iov_len);
1061         argp->p = (u32*)  (write->wr_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1062         write->wr_vec[v].iov_len = len;
1063         write->wr_vlen = v+1;
1064
1065         DECODE_TAIL;
1066 }
1067
1068 static int
1069 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1070 {
1071         DECODE_HEAD;
1072
1073         READ_BUF(12);
1074         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1075         READ32(rlockowner->rl_owner.len);
1076         READ_BUF(rlockowner->rl_owner.len);
1077         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1078
1079         DECODE_TAIL;
1080 }
1081
1082 static int
1083 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1084 {
1085         DECODE_HEAD;
1086         struct nfsd4_op *op;
1087         int i;
1088
1089         /*
1090          * XXX: According to spec, we should check the tag
1091          * for UTF-8 compliance.  I'm postponing this for
1092          * now because it seems that some clients do use
1093          * binary tags.
1094          */
1095         READ_BUF(4);
1096         READ32(argp->taglen);
1097         READ_BUF(argp->taglen + 8);
1098         SAVEMEM(argp->tag, argp->taglen);
1099         READ32(argp->minorversion);
1100         READ32(argp->opcnt);
1101
1102         if (argp->taglen > NFSD4_MAX_TAGLEN)
1103                 goto xdr_error;
1104         if (argp->opcnt > 100)
1105                 goto xdr_error;
1106
1107         if (argp->opcnt > sizeof(argp->iops)/sizeof(argp->iops[0])) {
1108                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1109                 if (!argp->ops) {
1110                         argp->ops = argp->iops;
1111                         printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
1112                         goto xdr_error;
1113                 }
1114         }
1115
1116         for (i = 0; i < argp->opcnt; i++) {
1117                 op = &argp->ops[i];
1118                 op->replay = NULL;
1119
1120                 /*
1121                  * We can't use READ_BUF() here because we need to handle
1122                  * a missing opcode as an OP_WRITE + 1. So we need to check
1123                  * to see if we're truly at the end of our buffer or if there
1124                  * is another page we need to flip to.
1125                  */
1126
1127                 if (argp->p == argp->end) {
1128                         if (argp->pagelen < 4) {
1129                                 /* There isn't an opcode still on the wire */
1130                                 op->opnum = OP_WRITE + 1;
1131                                 op->status = nfserr_bad_xdr;
1132                                 argp->opcnt = i+1;
1133                                 break;
1134                         }
1135
1136                         /*
1137                          * False alarm. We just hit a page boundary, but there
1138                          * is still data available.  Move pointer across page
1139                          * boundary.  *snip from READ_BUF*
1140                          */
1141                         argp->p = page_address(argp->pagelist[0]);
1142                         argp->pagelist++;
1143                         if (argp->pagelen < PAGE_SIZE) {
1144                                 argp->end = p + (argp->pagelen>>2);
1145                                 argp->pagelen = 0;
1146                         } else {
1147                                 argp->end = p + (PAGE_SIZE>>2);
1148                                 argp->pagelen -= PAGE_SIZE;
1149                         }
1150                 }
1151                 op->opnum = ntohl(*argp->p++);
1152
1153                 switch (op->opnum) {
1154                 case 2: /* Reserved operation */
1155                         op->opnum = OP_ILLEGAL;
1156                         if (argp->minorversion == 0)
1157                                 op->status = nfserr_op_illegal;
1158                         else
1159                                 op->status = nfserr_minor_vers_mismatch;
1160                         break;
1161                 case OP_ACCESS:
1162                         op->status = nfsd4_decode_access(argp, &op->u.access);
1163                         break;
1164                 case OP_CLOSE:
1165                         op->status = nfsd4_decode_close(argp, &op->u.close);
1166                         break;
1167                 case OP_COMMIT:
1168                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1169                         break;
1170                 case OP_CREATE:
1171                         op->status = nfsd4_decode_create(argp, &op->u.create);
1172                         break;
1173                 case OP_GETATTR:
1174                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1175                         break;
1176                 case OP_GETFH:
1177                         op->status = nfs_ok;
1178                         break;
1179                 case OP_LINK:
1180                         op->status = nfsd4_decode_link(argp, &op->u.link);
1181                         break;
1182                 case OP_LOCK:
1183                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1184                         break;
1185                 case OP_LOCKT:
1186                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1187                         break;
1188                 case OP_LOCKU:
1189                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1190                         break;
1191                 case OP_LOOKUP:
1192                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1193                         break;
1194                 case OP_LOOKUPP:
1195                         op->status = nfs_ok;
1196                         break;
1197                 case OP_NVERIFY:
1198                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1199                         break;
1200                 case OP_OPEN:
1201                         op->status = nfsd4_decode_open(argp, &op->u.open);
1202                         break;
1203                 case OP_OPEN_CONFIRM:
1204                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1205                         break;
1206                 case OP_OPEN_DOWNGRADE:
1207                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1208                         break;
1209                 case OP_PUTFH:
1210                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1211                         break;
1212                 case OP_PUTROOTFH:
1213                         op->status = nfs_ok;
1214                         break;
1215                 case OP_READ:
1216                         op->status = nfsd4_decode_read(argp, &op->u.read);
1217                         break;
1218                 case OP_READDIR:
1219                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1220                         break;
1221                 case OP_READLINK:
1222                         op->status = nfs_ok;
1223                         break;
1224                 case OP_REMOVE:
1225                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1226                         break;
1227                 case OP_RENAME:
1228                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1229                         break;
1230                 case OP_RESTOREFH:
1231                         op->status = nfs_ok;
1232                         break;
1233                 case OP_RENEW:
1234                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1235                         break;
1236                 case OP_SAVEFH:
1237                         op->status = nfs_ok;
1238                         break;
1239                 case OP_SETATTR:
1240                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1241                         break;
1242                 case OP_SETCLIENTID:
1243                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1244                         break;
1245                 case OP_SETCLIENTID_CONFIRM:
1246                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1247                         break;
1248                 case OP_VERIFY:
1249                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1250                         break;
1251                 case OP_WRITE:
1252                         op->status = nfsd4_decode_write(argp, &op->u.write);
1253                         break;
1254                 case OP_RELEASE_LOCKOWNER:
1255                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1256                         break;
1257                 default:
1258                         op->opnum = OP_ILLEGAL;
1259                         op->status = nfserr_op_illegal;
1260                         break;
1261                 }
1262
1263                 if (op->status) {
1264                         argp->opcnt = i+1;
1265                         break;
1266                 }
1267         }
1268
1269         DECODE_TAIL;
1270 }
1271 /*
1272  * END OF "GENERIC" DECODE ROUTINES.
1273  */
1274
1275 /*
1276  * START OF "GENERIC" ENCODE ROUTINES.
1277  *   These may look a little ugly since they are imported from a "generic"
1278  * set of XDR encode/decode routines which are intended to be shared by
1279  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1280  *
1281  * If the pain of reading these is too great, it should be a straightforward
1282  * task to translate them into Linux-specific versions which are more
1283  * consistent with the style used in NFSv2/v3...
1284  */
1285 #define ENCODE_HEAD              u32 *p
1286
1287 #define WRITE32(n)               *p++ = htonl(n)
1288 #define WRITE64(n)               do {                           \
1289         *p++ = htonl((u32)((n) >> 32));                         \
1290         *p++ = htonl((u32)(n));                                 \
1291 } while (0)
1292 #define WRITEMEM(ptr,nbytes)     do {                           \
1293         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1294         memcpy(p, ptr, nbytes);                                 \
1295         p += XDR_QUADLEN(nbytes);                               \
1296 } while (0)
1297 #define WRITECINFO(c)           do {                            \
1298         *p++ = htonl(c.atomic);                                 \
1299         *p++ = htonl(c.before_ctime_sec);                               \
1300         *p++ = htonl(c.before_ctime_nsec);                              \
1301         *p++ = htonl(c.after_ctime_sec);                                \
1302         *p++ = htonl(c.after_ctime_nsec);                               \
1303 } while (0)
1304
1305 #define RESERVE_SPACE(nbytes)   do {                            \
1306         p = resp->p;                                            \
1307         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1308 } while (0)
1309 #define ADJUST_ARGS()           resp->p = p
1310
1311 /*
1312  * Header routine to setup seqid operation replay cache
1313  */
1314 #define ENCODE_SEQID_OP_HEAD                                    \
1315         u32 *p;                                                 \
1316         u32 *save;                                              \
1317                                                                 \
1318         save = resp->p;
1319
1320 /*
1321  * Routine for encoding the result of a
1322  * "seqid-mutating" NFSv4 operation.  This is
1323  * where seqids are incremented, and the
1324  * replay cache is filled.
1325  */
1326
1327 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1328         if (seqid_mutating_err(nfserr) && stateowner) {         \
1329                 if (stateowner->so_confirmed)                   \
1330                         stateowner->so_seqid++;                 \
1331                 stateowner->so_replay.rp_status = nfserr;       \
1332                 stateowner->so_replay.rp_buflen =               \
1333                           (((char *)(resp)->p - (char *)save)); \
1334                 memcpy(stateowner->so_replay.rp_buf, save,      \
1335                         stateowner->so_replay.rp_buflen);       \
1336         } } while (0);
1337
1338
1339 static u32 nfs4_ftypes[16] = {
1340         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1341         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1342         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1343         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1344 };
1345
1346 static int
1347 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1348                         u32 **p, int *buflen)
1349 {
1350         int status;
1351
1352         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1353                 return nfserr_resource;
1354         if (whotype != NFS4_ACL_WHO_NAMED)
1355                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1356         else if (group)
1357                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1358         else
1359                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1360         if (status < 0)
1361                 return nfserrno(status);
1362         *p = xdr_encode_opaque(*p, NULL, status);
1363         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1364         BUG_ON(*buflen < 0);
1365         return 0;
1366 }
1367
1368 static inline int
1369 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, u32 **p, int *buflen)
1370 {
1371         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1372 }
1373
1374 static inline int
1375 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, u32 **p, int *buflen)
1376 {
1377         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1378 }
1379
1380 static inline int
1381 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1382                 u32 **p, int *buflen)
1383 {
1384         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1385 }
1386
1387
1388 /*
1389  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1390  * ourselves.
1391  *
1392  * @countp is the buffer size in _words_; upon successful return this becomes
1393  * replaced with the number of words written.
1394  */
1395 int
1396 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1397                 struct dentry *dentry, u32 *buffer, int *countp, u32 *bmval,
1398                 struct svc_rqst *rqstp)
1399 {
1400         u32 bmval0 = bmval[0];
1401         u32 bmval1 = bmval[1];
1402         struct kstat stat;
1403         struct svc_fh tempfh;
1404         struct kstatfs statfs;
1405         int buflen = *countp << 2;
1406         u32 *attrlenp;
1407         u32 dummy;
1408         u64 dummy64;
1409         u32 *p = buffer;
1410         int status;
1411         int aclsupport = 0;
1412         struct nfs4_acl *acl = NULL;
1413
1414         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1415         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1416         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1417
1418         status = vfs_getattr(exp->ex_mnt, dentry, &stat);
1419         if (status)
1420                 goto out_nfserr;
1421         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1422             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1423                        FATTR4_WORD1_SPACE_TOTAL))) {
1424                 status = vfs_statfs(dentry->d_inode->i_sb, &statfs);
1425                 if (status)
1426                         goto out_nfserr;
1427         }
1428         if ((bmval0 & FATTR4_WORD0_FILEHANDLE) && !fhp) {
1429                 fh_init(&tempfh, NFS4_FHSIZE);
1430                 status = fh_compose(&tempfh, exp, dentry, NULL);
1431                 if (status)
1432                         goto out;
1433                 fhp = &tempfh;
1434         }
1435         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1436                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1437                 status = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1438                 aclsupport = (status == 0);
1439                 if (bmval0 & FATTR4_WORD0_ACL) {
1440                         if (status == -EOPNOTSUPP)
1441                                 bmval0 &= ~FATTR4_WORD0_ACL;
1442                         else if (status != 0)
1443                                 goto out_nfserr;
1444                 }
1445         }
1446         if ((buflen -= 16) < 0)
1447                 goto out_resource;
1448
1449         WRITE32(2);
1450         WRITE32(bmval0);
1451         WRITE32(bmval1);
1452         attrlenp = p++;                /* to be backfilled later */
1453
1454         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1455                 if ((buflen -= 12) < 0)
1456                         goto out_resource;
1457                 WRITE32(2);
1458                 WRITE32(aclsupport ?
1459                         NFSD_SUPPORTED_ATTRS_WORD0 :
1460                         NFSD_SUPPORTED_ATTRS_WORD0 & ~FATTR4_WORD0_ACL);
1461                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1462         }
1463         if (bmval0 & FATTR4_WORD0_TYPE) {
1464                 if ((buflen -= 4) < 0)
1465                         goto out_resource;
1466                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1467                 if (dummy == NF4BAD)
1468                         goto out_serverfault;
1469                 WRITE32(dummy);
1470         }
1471         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1472                 if ((buflen -= 4) < 0)
1473                         goto out_resource;
1474                 WRITE32( NFS4_FH_NOEXPIRE_WITH_OPEN | NFS4_FH_VOL_RENAME );
1475         }
1476         if (bmval0 & FATTR4_WORD0_CHANGE) {
1477                 /*
1478                  * Note: This _must_ be consistent with the scheme for writing
1479                  * change_info, so any changes made here must be reflected there
1480                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1481                  * macro above.)
1482                  */
1483                 if ((buflen -= 8) < 0)
1484                         goto out_resource;
1485                 WRITE32(stat.ctime.tv_sec);
1486                 WRITE32(stat.ctime.tv_nsec);
1487         }
1488         if (bmval0 & FATTR4_WORD0_SIZE) {
1489                 if ((buflen -= 8) < 0)
1490                         goto out_resource;
1491                 WRITE64(stat.size);
1492         }
1493         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1494                 if ((buflen -= 4) < 0)
1495                         goto out_resource;
1496                 WRITE32(1);
1497         }
1498         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1499                 if ((buflen -= 4) < 0)
1500                         goto out_resource;
1501                 WRITE32(1);
1502         }
1503         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1504                 if ((buflen -= 4) < 0)
1505                         goto out_resource;
1506                 WRITE32(0);
1507         }
1508         if (bmval0 & FATTR4_WORD0_FSID) {
1509                 if ((buflen -= 16) < 0)
1510                         goto out_resource;
1511                 WRITE32(0);
1512                 WRITE32(MAJOR(stat.dev));
1513                 WRITE32(0);
1514                 WRITE32(MINOR(stat.dev));
1515         }
1516         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1517                 if ((buflen -= 4) < 0)
1518                         goto out_resource;
1519                 WRITE32(0);
1520         }
1521         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1522                 if ((buflen -= 4) < 0)
1523                         goto out_resource;
1524                 WRITE32(NFSD_LEASE_TIME);
1525         }
1526         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1527                 if ((buflen -= 4) < 0)
1528                         goto out_resource;
1529                 WRITE32(0);
1530         }
1531         if (bmval0 & FATTR4_WORD0_ACL) {
1532                 struct nfs4_ace *ace;
1533                 struct list_head *h;
1534
1535                 if (acl == NULL) {
1536                         if ((buflen -= 4) < 0)
1537                                 goto out_resource;
1538
1539                         WRITE32(0);
1540                         goto out_acl;
1541                 }
1542                 if ((buflen -= 4) < 0)
1543                         goto out_resource;
1544                 WRITE32(acl->naces);
1545
1546                 list_for_each(h, &acl->ace_head) {
1547                         ace = list_entry(h, struct nfs4_ace, l_ace);
1548
1549                         if ((buflen -= 4*3) < 0)
1550                                 goto out_resource;
1551                         WRITE32(ace->type);
1552                         WRITE32(ace->flag);
1553                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1554                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1555                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1556                                 &p, &buflen);
1557                         if (status == nfserr_resource)
1558                                 goto out_resource;
1559                         if (status)
1560                                 goto out;
1561                 }
1562         }
1563 out_acl:
1564         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1565                 if ((buflen -= 4) < 0)
1566                         goto out_resource;
1567                 WRITE32(aclsupport ?
1568                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1569         }
1570         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1571                 if ((buflen -= 4) < 0)
1572                         goto out_resource;
1573                 WRITE32(1);
1574         }
1575         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1576                 if ((buflen -= 4) < 0)
1577                         goto out_resource;
1578                 WRITE32(1);
1579         }
1580         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1581                 if ((buflen -= 4) < 0)
1582                         goto out_resource;
1583                 WRITE32(1);
1584         }
1585         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1586                 if ((buflen -= 4) < 0)
1587                         goto out_resource;
1588                 WRITE32(1);
1589         }
1590         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1591                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1592                 if (buflen < 0)
1593                         goto out_resource;
1594                 WRITE32(fhp->fh_handle.fh_size);
1595                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1596         }
1597         if (bmval0 & FATTR4_WORD0_FILEID) {
1598                 if ((buflen -= 8) < 0)
1599                         goto out_resource;
1600                 WRITE64((u64) stat.ino);
1601         }
1602         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1603                 if ((buflen -= 8) < 0)
1604                         goto out_resource;
1605                 WRITE64((u64) statfs.f_ffree);
1606         }
1607         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1608                 if ((buflen -= 8) < 0)
1609                         goto out_resource;
1610                 WRITE64((u64) statfs.f_ffree);
1611         }
1612         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1613                 if ((buflen -= 8) < 0)
1614                         goto out_resource;
1615                 WRITE64((u64) statfs.f_files);
1616         }
1617         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1618                 if ((buflen -= 4) < 0)
1619                         goto out_resource;
1620                 WRITE32(1);
1621         }
1622         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1623                 if ((buflen -= 8) < 0)
1624                         goto out_resource;
1625                 WRITE64(~(u64)0);
1626         }
1627         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1628                 if ((buflen -= 4) < 0)
1629                         goto out_resource;
1630                 WRITE32(255);
1631         }
1632         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1633                 if ((buflen -= 4) < 0)
1634                         goto out_resource;
1635                 WRITE32(~(u32) 0);
1636         }
1637         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1638                 if ((buflen -= 8) < 0)
1639                         goto out_resource;
1640                 WRITE64((u64) NFSSVC_MAXBLKSIZE);
1641         }
1642         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1643                 if ((buflen -= 8) < 0)
1644                         goto out_resource;
1645                 WRITE64((u64) NFSSVC_MAXBLKSIZE);
1646         }
1647         if (bmval1 & FATTR4_WORD1_MODE) {
1648                 if ((buflen -= 4) < 0)
1649                         goto out_resource;
1650                 WRITE32(stat.mode & S_IALLUGO);
1651         }
1652         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1653                 if ((buflen -= 4) < 0)
1654                         goto out_resource;
1655                 WRITE32(1);
1656         }
1657         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1658                 if ((buflen -= 4) < 0)
1659                         goto out_resource;
1660                 WRITE32(stat.nlink);
1661         }
1662         if (bmval1 & FATTR4_WORD1_OWNER) {
1663                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1664                 if (status == nfserr_resource)
1665                         goto out_resource;
1666                 if (status)
1667                         goto out;
1668         }
1669         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1670                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1671                 if (status == nfserr_resource)
1672                         goto out_resource;
1673                 if (status)
1674                         goto out;
1675         }
1676         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1677                 if ((buflen -= 8) < 0)
1678                         goto out_resource;
1679                 WRITE32((u32) MAJOR(stat.rdev));
1680                 WRITE32((u32) MINOR(stat.rdev));
1681         }
1682         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1683                 if ((buflen -= 8) < 0)
1684                         goto out_resource;
1685                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1686                 WRITE64(dummy64);
1687         }
1688         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1689                 if ((buflen -= 8) < 0)
1690                         goto out_resource;
1691                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1692                 WRITE64(dummy64);
1693         }
1694         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1695                 if ((buflen -= 8) < 0)
1696                         goto out_resource;
1697                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1698                 WRITE64(dummy64);
1699         }
1700         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1701                 if ((buflen -= 8) < 0)
1702                         goto out_resource;
1703                 dummy64 = (u64)stat.blocks << 9;
1704                 WRITE64(dummy64);
1705         }
1706         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1707                 if ((buflen -= 12) < 0)
1708                         goto out_resource;
1709                 WRITE32(0);
1710                 WRITE32(stat.atime.tv_sec);
1711                 WRITE32(stat.atime.tv_nsec);
1712         }
1713         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1714                 if ((buflen -= 12) < 0)
1715                         goto out_resource;
1716                 WRITE32(0);
1717                 WRITE32(1);
1718                 WRITE32(0);
1719         }
1720         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1721                 if ((buflen -= 12) < 0)
1722                         goto out_resource;
1723                 WRITE32(0);
1724                 WRITE32(stat.ctime.tv_sec);
1725                 WRITE32(stat.ctime.tv_nsec);
1726         }
1727         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1728                 if ((buflen -= 12) < 0)
1729                         goto out_resource;
1730                 WRITE32(0);
1731                 WRITE32(stat.mtime.tv_sec);
1732                 WRITE32(stat.mtime.tv_nsec);
1733         }
1734         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1735                 struct dentry *mnt_pnt, *mnt_root;
1736
1737                 if ((buflen -= 8) < 0)
1738                         goto out_resource;
1739                 mnt_root = exp->ex_mnt->mnt_root;
1740                 if (mnt_root->d_inode == dentry->d_inode) {
1741                         mnt_pnt = exp->ex_mnt->mnt_mountpoint;
1742                         WRITE64((u64) mnt_pnt->d_inode->i_ino);
1743                 } else
1744                         WRITE64((u64) stat.ino);
1745         }
1746         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1747         *countp = p - buffer;
1748         status = nfs_ok;
1749
1750 out:
1751         nfs4_acl_free(acl);
1752         if (fhp == &tempfh)
1753                 fh_put(&tempfh);
1754         return status;
1755 out_nfserr:
1756         status = nfserrno(status);
1757         goto out;
1758 out_resource:
1759         *countp = 0;
1760         status = nfserr_resource;
1761         goto out;
1762 out_serverfault:
1763         status = nfserr_serverfault;
1764         goto out;
1765 }
1766
1767 static int
1768 nfsd4_encode_dirent(struct readdir_cd *ccd, const char *name, int namlen,
1769                     loff_t offset, ino_t ino, unsigned int d_type)
1770 {
1771         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1772         int buflen;
1773         u32 *p = cd->buffer;
1774         u32 *attrlenp;
1775         struct dentry *dentry;
1776         struct svc_export *exp = cd->rd_fhp->fh_export;
1777         u32 bmval0, bmval1;
1778         int nfserr = 0;
1779
1780         /* In nfsv4, "." and ".." never make it onto the wire.. */
1781         if (name && isdotent(name, namlen)) {
1782                 cd->common.err = nfs_ok;
1783                 return 0;
1784         }
1785
1786         if (cd->offset)
1787                 xdr_encode_hyper(cd->offset, (u64) offset);
1788
1789         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1790         if (buflen < 0)
1791                 goto nospc;
1792
1793         *p++ = xdr_one;                             /* mark entry present */
1794         cd->offset = p;                             /* remember pointer */
1795         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1796         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1797
1798         /*
1799          * Now we come to the ugly part: writing the fattr for this entry.
1800          */
1801         bmval0 = cd->rd_bmval[0];
1802         bmval1 = cd->rd_bmval[1];
1803         if ((bmval0 & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_FILEID)) || bmval1)  {
1804                 /*
1805                  * "Heavyweight" case: we have no choice except to
1806                  * call nfsd4_encode_fattr().
1807                  */
1808                 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1809                 if (IS_ERR(dentry)) {
1810                         nfserr = nfserrno(PTR_ERR(dentry));
1811                         goto error;
1812                 }
1813
1814                 exp_get(exp);
1815                 if (d_mountpoint(dentry)) {
1816                         if ((nfserr = nfsd_cross_mnt(cd->rd_rqstp, &dentry,
1817                                          &exp))) {
1818                         /*
1819                          * -EAGAIN is the only error returned from
1820                          * nfsd_cross_mnt() and it indicates that an
1821                          * up-call has  been initiated to fill in the export
1822                          * options on exp.  When the answer comes back,
1823                          * this call will be retried.
1824                          */
1825                                 dput(dentry);
1826                                 exp_put(exp);
1827                                 nfserr = nfserr_dropit;
1828                                 goto error;
1829                         }
1830
1831                 }
1832
1833                 nfserr = nfsd4_encode_fattr(NULL, exp,
1834                                 dentry, p, &buflen, cd->rd_bmval,
1835                                 cd->rd_rqstp);
1836                 dput(dentry);
1837                 exp_put(exp);
1838                 if (!nfserr) {
1839                         p += buflen;
1840                         goto out;
1841                 }
1842                 if (nfserr == nfserr_resource)
1843                         goto nospc;
1844
1845 error:
1846                 /*
1847                  * If we get here, we experienced a miscellaneous
1848                  * failure while writing the attributes.  If the
1849                  * client requested the RDATTR_ERROR attribute,
1850                  * we stuff the error code into this attribute
1851                  * and continue.  If this attribute was not requested,
1852                  * then in accordance with the spec, we fail the
1853                  * entire READDIR operation(!)
1854                  */
1855                 if (!(bmval0 & FATTR4_WORD0_RDATTR_ERROR)) {
1856                         cd->common.err = nfserr;
1857                         return -EINVAL;
1858                 }
1859
1860                 bmval0 = FATTR4_WORD0_RDATTR_ERROR;
1861                 bmval1 = 0;
1862                 /* falling through here will do the right thing... */
1863         }
1864
1865         /*
1866          * In the common "lightweight" case, we avoid
1867          * the overhead of nfsd4_encode_fattr() by assembling
1868          * a small fattr by hand.
1869          */
1870         if (buflen < 6)
1871                 goto nospc;
1872         *p++ = htonl(2);
1873         *p++ = htonl(bmval0);
1874         *p++ = htonl(bmval1);
1875
1876         attrlenp = p++;
1877         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR)
1878                 *p++ = nfserr;       /* no htonl */
1879         if (bmval0 & FATTR4_WORD0_FILEID)
1880                 p = xdr_encode_hyper(p, (u64)ino);
1881         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1882
1883 out:
1884         cd->buflen -= (p - cd->buffer);
1885         cd->buffer = p;
1886         cd->common.err = nfs_ok;
1887         return 0;
1888
1889 nospc:
1890         cd->common.err = nfserr_toosmall;
1891         return -EINVAL;
1892 }
1893
1894 static void
1895 nfsd4_encode_access(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_access *access)
1896 {
1897         ENCODE_HEAD;
1898
1899         if (!nfserr) {
1900                 RESERVE_SPACE(8);
1901                 WRITE32(access->ac_supported);
1902                 WRITE32(access->ac_resp_access);
1903                 ADJUST_ARGS();
1904         }
1905 }
1906
1907 static void
1908 nfsd4_encode_close(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_close *close)
1909 {
1910         ENCODE_SEQID_OP_HEAD;
1911
1912         if (!nfserr) {
1913                 RESERVE_SPACE(sizeof(stateid_t));
1914                 WRITE32(close->cl_stateid.si_generation);
1915                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1916                 ADJUST_ARGS();
1917         }
1918         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1919 }
1920
1921
1922 static void
1923 nfsd4_encode_commit(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_commit *commit)
1924 {
1925         ENCODE_HEAD;
1926
1927         if (!nfserr) {
1928                 RESERVE_SPACE(8);
1929                 WRITEMEM(commit->co_verf.data, 8);
1930                 ADJUST_ARGS();
1931         }
1932 }
1933
1934 static void
1935 nfsd4_encode_create(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_create *create)
1936 {
1937         ENCODE_HEAD;
1938
1939         if (!nfserr) {
1940                 RESERVE_SPACE(32);
1941                 WRITECINFO(create->cr_cinfo);
1942                 WRITE32(2);
1943                 WRITE32(create->cr_bmval[0]);
1944                 WRITE32(create->cr_bmval[1]);
1945                 ADJUST_ARGS();
1946         }
1947 }
1948
1949 static int
1950 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_getattr *getattr)
1951 {
1952         struct svc_fh *fhp = getattr->ga_fhp;
1953         int buflen;
1954
1955         if (nfserr)
1956                 return nfserr;
1957
1958         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
1959         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
1960                                     resp->p, &buflen, getattr->ga_bmval,
1961                                     resp->rqstp);
1962
1963         if (!nfserr)
1964                 resp->p += buflen;
1965         return nfserr;
1966 }
1967
1968 static void
1969 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, int nfserr, struct svc_fh *fhp)
1970 {
1971         unsigned int len;
1972         ENCODE_HEAD;
1973
1974         if (!nfserr) {
1975                 len = fhp->fh_handle.fh_size;
1976                 RESERVE_SPACE(len + 4);
1977                 WRITE32(len);
1978                 WRITEMEM(&fhp->fh_handle.fh_base, len);
1979                 ADJUST_ARGS();
1980         }
1981 }
1982
1983 /*
1984 * Including all fields other than the name, a LOCK4denied structure requires
1985 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
1986 */
1987 static void
1988 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
1989 {
1990         ENCODE_HEAD;
1991
1992         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
1993         WRITE64(ld->ld_start);
1994         WRITE64(ld->ld_length);
1995         WRITE32(ld->ld_type);
1996         if (ld->ld_sop) {
1997                 WRITEMEM(&ld->ld_clientid, 8);
1998                 WRITE32(ld->ld_sop->so_owner.len);
1999                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2000                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2001         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2002                 WRITE64((u64)0); /* clientid */
2003                 WRITE32(0); /* length of owner name */
2004         }
2005         ADJUST_ARGS();
2006 }
2007
2008 static void
2009 nfsd4_encode_lock(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lock *lock)
2010 {
2011
2012         ENCODE_SEQID_OP_HEAD;
2013
2014         if (!nfserr) {
2015                 RESERVE_SPACE(4 + sizeof(stateid_t));
2016                 WRITE32(lock->lk_resp_stateid.si_generation);
2017                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2018                 ADJUST_ARGS();
2019         } else if (nfserr == nfserr_denied)
2020                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2021
2022         ENCODE_SEQID_OP_TAIL(lock->lk_stateowner);
2023 }
2024
2025 static void
2026 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lockt *lockt)
2027 {
2028         if (nfserr == nfserr_denied)
2029                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2030 }
2031
2032 static void
2033 nfsd4_encode_locku(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_locku *locku)
2034 {
2035         ENCODE_SEQID_OP_HEAD;
2036
2037         if (!nfserr) {
2038                 RESERVE_SPACE(sizeof(stateid_t));
2039                 WRITE32(locku->lu_stateid.si_generation);
2040                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2041                 ADJUST_ARGS();
2042         }
2043
2044         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2045 }
2046
2047
2048 static void
2049 nfsd4_encode_link(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_link *link)
2050 {
2051         ENCODE_HEAD;
2052
2053         if (!nfserr) {
2054                 RESERVE_SPACE(20);
2055                 WRITECINFO(link->li_cinfo);
2056                 ADJUST_ARGS();
2057         }
2058 }
2059
2060
2061 static void
2062 nfsd4_encode_open(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open *open)
2063 {
2064         ENCODE_SEQID_OP_HEAD;
2065
2066         if (nfserr)
2067                 goto out;
2068
2069         RESERVE_SPACE(36 + sizeof(stateid_t));
2070         WRITE32(open->op_stateid.si_generation);
2071         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2072         WRITECINFO(open->op_cinfo);
2073         WRITE32(open->op_rflags);
2074         WRITE32(2);
2075         WRITE32(open->op_bmval[0]);
2076         WRITE32(open->op_bmval[1]);
2077         WRITE32(open->op_delegate_type);
2078         ADJUST_ARGS();
2079
2080         switch (open->op_delegate_type) {
2081         case NFS4_OPEN_DELEGATE_NONE:
2082                 break;
2083         case NFS4_OPEN_DELEGATE_READ:
2084                 RESERVE_SPACE(20 + sizeof(delegation_stateid_t));
2085                 WRITEMEM(&open->op_delegate_stateid, sizeof(delegation_stateid_t));
2086                 WRITE32(0);
2087
2088                 /*
2089                  * TODO: ACE's in delegations
2090                  */
2091                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2092                 WRITE32(0);
2093                 WRITE32(0);
2094                 WRITE32(0);   /* XXX: is NULL principal ok? */
2095                 ADJUST_ARGS();
2096                 break;
2097         case NFS4_OPEN_DELEGATE_WRITE:
2098                 RESERVE_SPACE(32 + sizeof(delegation_stateid_t));
2099                 WRITEMEM(&open->op_delegate_stateid, sizeof(delegation_stateid_t));
2100                 WRITE32(0);
2101
2102                 /*
2103                  * TODO: space_limit's in delegations
2104                  */
2105                 WRITE32(NFS4_LIMIT_SIZE);
2106                 WRITE32(~(u32)0);
2107                 WRITE32(~(u32)0);
2108
2109                 /*
2110                  * TODO: ACE's in delegations
2111                  */
2112                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2113                 WRITE32(0);
2114                 WRITE32(0);
2115                 WRITE32(0);   /* XXX: is NULL principal ok? */
2116                 ADJUST_ARGS();
2117                 break;
2118         default:
2119                 BUG();
2120         }
2121         /* XXX save filehandle here */
2122 out:
2123         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2124 }
2125
2126 static void
2127 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_confirm *oc)
2128 {
2129         ENCODE_SEQID_OP_HEAD;
2130
2131         if (!nfserr) {
2132                 RESERVE_SPACE(sizeof(stateid_t));
2133                 WRITE32(oc->oc_resp_stateid.si_generation);
2134                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2135                 ADJUST_ARGS();
2136         }
2137
2138         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2139 }
2140
2141 static void
2142 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_downgrade *od)
2143 {
2144         ENCODE_SEQID_OP_HEAD;
2145
2146         if (!nfserr) {
2147                 RESERVE_SPACE(sizeof(stateid_t));
2148                 WRITE32(od->od_stateid.si_generation);
2149                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2150                 ADJUST_ARGS();
2151         }
2152
2153         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2154 }
2155
2156 static int
2157 nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_read *read)
2158 {
2159         u32 eof;
2160         int v, pn;
2161         unsigned long maxcount;
2162         long len;
2163         ENCODE_HEAD;
2164
2165         if (nfserr)
2166                 return nfserr;
2167         if (resp->xbuf->page_len)
2168                 return nfserr_resource;
2169
2170         RESERVE_SPACE(8); /* eof flag and byte count */
2171
2172         maxcount = NFSSVC_MAXBLKSIZE;
2173         if (maxcount > read->rd_length)
2174                 maxcount = read->rd_length;
2175
2176         len = maxcount;
2177         v = 0;
2178         while (len > 0) {
2179                 pn = resp->rqstp->rq_resused;
2180                 svc_take_page(resp->rqstp);
2181                 read->rd_iov[v].iov_base = page_address(resp->rqstp->rq_respages[pn]);
2182                 read->rd_iov[v].iov_len = len < PAGE_SIZE ? len : PAGE_SIZE;
2183                 v++;
2184                 len -= PAGE_SIZE;
2185         }
2186         read->rd_vlen = v;
2187
2188         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp,
2189                            read->rd_offset,
2190                            read->rd_iov, read->rd_vlen,
2191                            &maxcount);
2192         if (nfserr == nfserr_symlink)
2193                 nfserr = nfserr_inval;
2194         if (nfserr)
2195                 return nfserr;
2196         eof = (read->rd_offset + maxcount >= read->rd_fhp->fh_dentry->d_inode->i_size);
2197
2198         WRITE32(eof);
2199         WRITE32(maxcount);
2200         ADJUST_ARGS();
2201         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2202
2203         resp->xbuf->page_len = maxcount;
2204
2205         /* read zero bytes -> don't set up tail */
2206         if(!maxcount)
2207                 return 0;
2208
2209         /* set up page for remaining responses */
2210         svc_take_page(resp->rqstp);
2211         resp->xbuf->tail[0].iov_base =
2212                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2213         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2214         resp->xbuf->tail[0].iov_len = 0;
2215         resp->p = resp->xbuf->tail[0].iov_base;
2216         resp->end = resp->p + PAGE_SIZE/4;
2217
2218         if (maxcount&3) {
2219                 *(resp->p)++ = 0;
2220                 resp->xbuf->tail[0].iov_base += maxcount&3;
2221                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2222         }
2223         return 0;
2224 }
2225
2226 static int
2227 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readlink *readlink)
2228 {
2229         int maxcount;
2230         char *page;
2231         ENCODE_HEAD;
2232
2233         if (nfserr)
2234                 return nfserr;
2235         if (resp->xbuf->page_len)
2236                 return nfserr_resource;
2237
2238         svc_take_page(resp->rqstp);
2239         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2240
2241         maxcount = PAGE_SIZE;
2242         RESERVE_SPACE(4);
2243
2244         /*
2245          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2246          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2247          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2248          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2249          */
2250         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2251         if (nfserr == nfserr_isdir)
2252                 return nfserr_inval;
2253         if (nfserr)
2254                 return nfserr;
2255
2256         WRITE32(maxcount);
2257         ADJUST_ARGS();
2258         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2259
2260         svc_take_page(resp->rqstp);
2261         resp->xbuf->tail[0].iov_base =
2262                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2263         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2264         resp->xbuf->tail[0].iov_len = 0;
2265         resp->p = resp->xbuf->tail[0].iov_base;
2266         resp->end = resp->p + PAGE_SIZE/4;
2267
2268         resp->xbuf->page_len = maxcount;
2269         if (maxcount&3) {
2270                 *(resp->p)++ = 0;
2271                 resp->xbuf->tail[0].iov_base += maxcount&3;
2272                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2273         }
2274         return 0;
2275 }
2276
2277 static int
2278 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readdir *readdir)
2279 {
2280         int maxcount;
2281         loff_t offset;
2282         u32 *page, *savep;
2283         ENCODE_HEAD;
2284
2285         if (nfserr)
2286                 return nfserr;
2287         if (resp->xbuf->page_len)
2288                 return nfserr_resource;
2289
2290         RESERVE_SPACE(8);  /* verifier */
2291         savep = p;
2292
2293         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2294         WRITE32(0);
2295         WRITE32(0);
2296         ADJUST_ARGS();
2297         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2298
2299         maxcount = PAGE_SIZE;
2300         if (maxcount > readdir->rd_maxcount)
2301                 maxcount = readdir->rd_maxcount;
2302
2303         /*
2304          * Convert from bytes to words, account for the two words already
2305          * written, make sure to leave two words at the end for the next
2306          * pointer and eof field.
2307          */
2308         maxcount = (maxcount >> 2) - 4;
2309         if (maxcount < 0) {
2310                 nfserr =  nfserr_toosmall;
2311                 goto err_no_verf;
2312         }
2313
2314         svc_take_page(resp->rqstp);
2315         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2316         readdir->common.err = 0;
2317         readdir->buflen = maxcount;
2318         readdir->buffer = page;
2319         readdir->offset = NULL;
2320
2321         offset = readdir->rd_cookie;
2322         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2323                               &offset,
2324                               &readdir->common, nfsd4_encode_dirent);
2325         if (nfserr == nfs_ok &&
2326             readdir->common.err == nfserr_toosmall &&
2327             readdir->buffer == page)
2328                 nfserr = nfserr_toosmall;
2329         if (nfserr == nfserr_symlink)
2330                 nfserr = nfserr_notdir;
2331         if (nfserr)
2332                 goto err_no_verf;
2333
2334         if (readdir->offset)
2335                 xdr_encode_hyper(readdir->offset, offset);
2336
2337         p = readdir->buffer;
2338         *p++ = 0;       /* no more entries */
2339         *p++ = htonl(readdir->common.err == nfserr_eof);
2340         resp->xbuf->page_len = ((char*)p) - (char*)page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2341
2342         /* allocate a page for the tail */
2343         svc_take_page(resp->rqstp);
2344         resp->xbuf->tail[0].iov_base =
2345                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2346         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2347         resp->xbuf->tail[0].iov_len = 0;
2348         resp->p = resp->xbuf->tail[0].iov_base;
2349         resp->end = resp->p + PAGE_SIZE/4;
2350
2351         return 0;
2352 err_no_verf:
2353         p = savep;
2354         ADJUST_ARGS();
2355         return nfserr;
2356 }
2357
2358 static void
2359 nfsd4_encode_remove(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_remove *remove)
2360 {
2361         ENCODE_HEAD;
2362
2363         if (!nfserr) {
2364                 RESERVE_SPACE(20);
2365                 WRITECINFO(remove->rm_cinfo);
2366                 ADJUST_ARGS();
2367         }
2368 }
2369
2370 static void
2371 nfsd4_encode_rename(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_rename *rename)
2372 {
2373         ENCODE_HEAD;
2374
2375         if (!nfserr) {
2376                 RESERVE_SPACE(40);
2377                 WRITECINFO(rename->rn_sinfo);
2378                 WRITECINFO(rename->rn_tinfo);
2379                 ADJUST_ARGS();
2380         }
2381 }
2382
2383 /*
2384  * The SETATTR encode routine is special -- it always encodes a bitmap,
2385  * regardless of the error status.
2386  */
2387 static void
2388 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setattr *setattr)
2389 {
2390         ENCODE_HEAD;
2391
2392         RESERVE_SPACE(12);
2393         if (nfserr) {
2394                 WRITE32(2);
2395                 WRITE32(0);
2396                 WRITE32(0);
2397         }
2398         else {
2399                 WRITE32(2);
2400                 WRITE32(setattr->sa_bmval[0]);
2401                 WRITE32(setattr->sa_bmval[1]);
2402         }
2403         ADJUST_ARGS();
2404 }
2405
2406 static void
2407 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setclientid *scd)
2408 {
2409         ENCODE_HEAD;
2410
2411         if (!nfserr) {
2412                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2413                 WRITEMEM(&scd->se_clientid, 8);
2414                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2415                 ADJUST_ARGS();
2416         }
2417         else if (nfserr == nfserr_clid_inuse) {
2418                 RESERVE_SPACE(8);
2419                 WRITE32(0);
2420                 WRITE32(0);
2421                 ADJUST_ARGS();
2422         }
2423 }
2424
2425 static void
2426 nfsd4_encode_write(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_write *write)
2427 {
2428         ENCODE_HEAD;
2429
2430         if (!nfserr) {
2431                 RESERVE_SPACE(16);
2432                 WRITE32(write->wr_bytes_written);
2433                 WRITE32(write->wr_how_written);
2434                 WRITEMEM(write->wr_verifier.data, 8);
2435                 ADJUST_ARGS();
2436         }
2437 }
2438
2439 void
2440 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2441 {
2442         u32 *statp;
2443         ENCODE_HEAD;
2444
2445         RESERVE_SPACE(8);
2446         WRITE32(op->opnum);
2447         statp = p++;    /* to be backfilled at the end */
2448         ADJUST_ARGS();
2449
2450         switch (op->opnum) {
2451         case OP_ACCESS:
2452                 nfsd4_encode_access(resp, op->status, &op->u.access);
2453                 break;
2454         case OP_CLOSE:
2455                 nfsd4_encode_close(resp, op->status, &op->u.close);
2456                 break;
2457         case OP_COMMIT:
2458                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2459                 break;
2460         case OP_CREATE:
2461                 nfsd4_encode_create(resp, op->status, &op->u.create);
2462                 break;
2463         case OP_GETATTR:
2464                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2465                 break;
2466         case OP_GETFH:
2467                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2468                 break;
2469         case OP_LINK:
2470                 nfsd4_encode_link(resp, op->status, &op->u.link);
2471                 break;
2472         case OP_LOCK:
2473                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2474                 break;
2475         case OP_LOCKT:
2476                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2477                 break;
2478         case OP_LOCKU:
2479                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2480                 break;
2481         case OP_LOOKUP:
2482                 break;
2483         case OP_LOOKUPP:
2484                 break;
2485         case OP_NVERIFY:
2486                 break;
2487         case OP_OPEN:
2488                 nfsd4_encode_open(resp, op->status, &op->u.open);
2489                 break;
2490         case OP_OPEN_CONFIRM:
2491                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2492                 break;
2493         case OP_OPEN_DOWNGRADE:
2494                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2495                 break;
2496         case OP_PUTFH:
2497                 break;
2498         case OP_PUTROOTFH:
2499                 break;
2500         case OP_READ:
2501                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2502                 break;
2503         case OP_READDIR:
2504                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2505                 break;
2506         case OP_READLINK:
2507                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2508                 break;
2509         case OP_REMOVE:
2510                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2511                 break;
2512         case OP_RENAME:
2513                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2514                 break;
2515         case OP_RENEW:
2516                 break;
2517         case OP_RESTOREFH:
2518                 break;
2519         case OP_SAVEFH:
2520                 break;
2521         case OP_SETATTR:
2522                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2523                 break;
2524         case OP_SETCLIENTID:
2525                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2526                 break;
2527         case OP_SETCLIENTID_CONFIRM:
2528                 break;
2529         case OP_VERIFY:
2530                 break;
2531         case OP_WRITE:
2532                 nfsd4_encode_write(resp, op->status, &op->u.write);
2533                 break;
2534         case OP_RELEASE_LOCKOWNER:
2535                 break;
2536         default:
2537                 break;
2538         }
2539
2540         /*
2541          * Note: We write the status directly, instead of using WRITE32(),
2542          * since it is already in network byte order.
2543          */
2544         *statp = op->status;
2545 }
2546
2547 /*
2548  * Encode the reply stored in the stateowner reply cache
2549  *
2550  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2551  * previously sent already encoded operation.
2552  *
2553  * called with nfs4_lock_state() held
2554  */
2555 void
2556 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2557 {
2558         ENCODE_HEAD;
2559         struct nfs4_replay *rp = op->replay;
2560
2561         BUG_ON(!rp);
2562
2563         RESERVE_SPACE(8);
2564         WRITE32(op->opnum);
2565         *p++ = rp->rp_status;  /* already xdr'ed */
2566         ADJUST_ARGS();
2567
2568         RESERVE_SPACE(rp->rp_buflen);
2569         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2570         ADJUST_ARGS();
2571 }
2572
2573 /*
2574  * END OF "GENERIC" ENCODE ROUTINES.
2575  */
2576
2577 int
2578 nfs4svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
2579 {
2580         return xdr_ressize_check(rqstp, p);
2581 }
2582
2583 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2584 {
2585         if (args->ops != args->iops) {
2586                 kfree(args->ops);
2587                 args->ops = args->iops;
2588         }
2589         if (args->tmpp) {
2590                 kfree(args->tmpp);
2591                 args->tmpp = NULL;
2592         }
2593         while (args->to_free) {
2594                 struct tmpbuf *tb = args->to_free;
2595                 args->to_free = tb->next;
2596                 tb->release(tb->buf);
2597                 kfree(tb);
2598         }
2599 }
2600
2601 int
2602 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundargs *args)
2603 {
2604         int status;
2605
2606         args->p = p;
2607         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2608         args->pagelist = rqstp->rq_arg.pages;
2609         args->pagelen = rqstp->rq_arg.page_len;
2610         args->tmpp = NULL;
2611         args->to_free = NULL;
2612         args->ops = args->iops;
2613         args->rqstp = rqstp;
2614
2615         status = nfsd4_decode_compound(args);
2616         if (status) {
2617                 nfsd4_release_compoundargs(args);
2618         }
2619         return !status;
2620 }
2621
2622 int
2623 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundres *resp)
2624 {
2625         /*
2626          * All that remains is to write the tag and operation count...
2627          */
2628         struct kvec *iov;
2629         p = resp->tagp;
2630         *p++ = htonl(resp->taglen);
2631         memcpy(p, resp->tag, resp->taglen);
2632         p += XDR_QUADLEN(resp->taglen);
2633         *p++ = htonl(resp->opcnt);
2634
2635         if (rqstp->rq_res.page_len)
2636                 iov = &rqstp->rq_res.tail[0];
2637         else
2638                 iov = &rqstp->rq_res.head[0];
2639         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2640         BUG_ON(iov->iov_len > PAGE_SIZE);
2641         return 1;
2642 }
2643
2644 /*
2645  * Local variables:
2646  *  c-basic-offset: 8
2647  * End:
2648  */