fs/nfsd/nfs4xdr.c

   1 /*
   2  *  fs/nfs/nfs4xdr.c
   3  *
   4  *  Server-side XDR for NFSv4
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * TODO: Neil Brown made the following observation:  We currently
  38  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  39  * never release any of that until the request is complete.
  40  * It would be good to calculate a new maximum response size while
  41  * decoding the COMPOUND, and call svc_reserve with this number
  42  * at the end of nfs4svc_decode_compoundargs.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/smp.h>
  47 #include <linux/smp_lock.h>
  48 #include <linux/fs.h>
  49 #include <linux/namei.h>
  50 #include <linux/vfs.h>
  51 #include <linux/sunrpc/xdr.h>
  52 #include <linux/sunrpc/svc.h>
  53 #include <linux/sunrpc/clnt.h>
  54 #include <linux/nfsd/nfsd.h>
  55 #include <linux/nfsd/state.h>
  56 #include <linux/nfsd/xdr4.h>
  57 #include <linux/nfsd_idmap.h>
  58 #include <linux/nfs4.h>
  59 #include <linux/nfs4_acl.h>
  60 #include <linux/vserver/xid.h>
  61
  62 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  63
  64 static const char utf8_byte_len[256] = {
  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         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,
  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         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  71         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,
  72         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
  73 };
  74
  75 static inline int
  76 is_legal_utf8_sequence(unsigned char *source, int length)
  77 {
  78         unsigned char *ptr;
  79         unsigned char c;
  80
  81         if (length==1) return 1;
  82
  83         /* Check for overlong sequence, and check second byte */
  84         c = *(source + 1);
  85         switch (*source) {
  86         case 0xE0: /* 3 bytes */
  87                 if ( c < 0xA0 ) return 0;
  88                 break;
  89         case 0xF0: /* 4 bytes */
  90                 if ( c < 0x90 ) return 0;
  91                 break;
  92         case 0xF8: /* 5 bytes */
  93                 if ( c < 0xC8 ) return 0;
  94                 break;
  95         case 0xFC: /* 6 bytes */
  96                 if ( c < 0x84 ) return 0;
  97                 break;
  98         default:
  99                 if ( (c & 0xC0) != 0x80) return 0;
 100         }
 101
 102         /* Check that trailing bytes look like 10xxxxxx */
 103         for (ptr = source++ + length - 1; ptr>source; ptr--)
 104                 if ( ((*ptr) & 0xC0) != 0x80 ) return 0;
 105         return 1;
 106 }
 107
 108 /* This does some screening on disallowed unicode characters.  It is NOT
 109  * comprehensive.
 110  */
 111 static int
 112 is_allowed_utf8_char(unsigned char *source, int length)
 113 {
 114         /* We assume length and source point to a valid utf8 sequence */
 115         unsigned char c;
 116
 117         /* Disallow F0000 and up (in utf8, F3B08080) */
 118         if (*source > 0xF3 ) return 0;
 119         c = *(source + 1);
 120         switch (*source) {
 121         case 0xF3:
 122                 if (c >= 0xB0) return 0;
 123                 break;
 124         /* Disallow D800-F8FF (in utf8, EDA080-EFA3BF */
 125         case 0xED:
 126                 if (c >= 0xA0) return 0;
 127                 break;
 128         case 0xEE:
 129                 return 0;
 130                 break;
 131         case 0xEF:
 132                 if (c <= 0xA3) return 0;
 133         /* Disallow FFF9-FFFF (EFBFB9-EFBFBF) */
 134                 if (c==0xBF)
 135                         /* Don't need to check <=0xBF, since valid utf8 */
 136                         if ( *(source+2) >= 0xB9) return 0;
 137                 break;
 138         }
 139         return 1;
 140 }
 141
 142 /* This routine should really check to see that the proper stringprep
 143  * mappings have been applied.  Instead, we do a simple screen of some
 144  * of the more obvious illegal values by calling is_allowed_utf8_char.
 145  * This will allow many illegal strings through, but if a client behaves,
 146  * it will get full functionality.  The other option (apart from full
 147  * stringprep checking) is to limit everything to an easily handled subset,
 148  * such as 7-bit ascii.
 149  *
 150  * Note - currently calling routines ignore return value except as boolean.
 151  */
 152 static int
 153 check_utf8(char *str, int len)
 154 {
 155         unsigned char *chunk, *sourceend;
 156         int chunklen;
 157
 158         chunk = str;
 159         sourceend = str + len;
 160
 161         while (chunk < sourceend) {
 162                 chunklen = utf8_byte_len[*chunk];
 163                 if (!chunklen)
 164                         return nfserr_inval;
 165                 if (chunk + chunklen > sourceend)
 166                         return nfserr_inval;
 167                 if (!is_legal_utf8_sequence(chunk, chunklen))
 168                         return nfserr_inval;
 169                 if (!is_allowed_utf8_char(chunk, chunklen))
 170                         return nfserr_inval;
 171                 if ( (chunklen==1) && (!*chunk) )
 172                         return nfserr_inval; /* Disallow embedded nulls */
 173                 chunk += chunklen;
 174         }
 175
 176         return 0;
 177 }
 178
 179 static int
 180 check_filename(char *str, int len, int err)
 181 {
 182         int i;
 183
 184         if (len == 0)
 185                 return nfserr_inval;
 186         if (isdotent(str, len))
 187                 return err;
 188         for (i = 0; i < len; i++)
 189                 if (str[i] == '/')
 190                         return err;
 191         return check_utf8(str, len);
 192 }
 193
 194 /*
 195  * START OF "GENERIC" DECODE ROUTINES.
 196  *   These may look a little ugly since they are imported from a "generic"
 197  * set of XDR encode/decode routines which are intended to be shared by
 198  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
 199  *
 200  * If the pain of reading these is too great, it should be a straightforward
 201  * task to translate them into Linux-specific versions which are more
 202  * consistent with the style used in NFSv2/v3...
 203  */
 204 #define DECODE_HEAD                             \
 205         u32 *p;                                 \
 206         int status
 207 #define DECODE_TAIL                             \
 208         status = 0;                             \
 209 out:                                            \
 210         return status;                          \
 211 xdr_error:                                      \
 212         printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 213         status = nfserr_bad_xdr;                \
 214         goto out
 215
 216 #define READ32(x)         (x) = ntohl(*p++)
 217 #define READ64(x)         do {                  \
 218         (x) = (u64)ntohl(*p++) << 32;           \
 219         (x) |= ntohl(*p++);                     \
 220 } while (0)
 221 #define READTIME(x)       do {                  \
 222         p++;                                    \
 223         (x) = ntohl(*p++);                      \
 224         p++;                                    \
 225 } while (0)
 226 #define READMEM(x,nbytes) do {                  \
 227         x = (char *)p;                          \
 228         p += XDR_QUADLEN(nbytes);               \
 229 } while (0)
 230 #define SAVEMEM(x,nbytes) do {                  \
 231         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 232                 savemem(argp, p, nbytes) :      \
 233                 (char *)p)) {                   \
 234                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 235                 goto xdr_error;                 \
 236                 }                               \
 237         p += XDR_QUADLEN(nbytes);               \
 238 } while (0)
 239 #define COPYMEM(x,nbytes) do {                  \
 240         memcpy((x), p, nbytes);                 \
 241         p += XDR_QUADLEN(nbytes);               \
 242 } while (0)
 243
 244 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 245 #define READ_BUF(nbytes)  do {                  \
 246         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 247                 p = argp->p;                    \
 248                 argp->p += XDR_QUADLEN(nbytes); \
 249         } else if (!(p = read_buf(argp, nbytes))) { \
 250                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
 251                 goto xdr_error;                 \
 252         }                                       \
 253 } while (0)
 254
 255 u32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
 256 {
 257         /* We want more bytes than seem to be available.
 258          * Maybe we need a new page, maybe we have just run out
 259          */
 260         int avail = (char*)argp->end - (char*)argp->p;
 261         u32 *p;
 262         if (avail + argp->pagelen < nbytes)
 263                 return NULL;
 264         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 265                 return NULL;
 266         /* ok, we can do it with the current plus the next page */
 267         if (nbytes <= sizeof(argp->tmp))
 268                 p = argp->tmp;
 269         else {
 270                 if (argp->tmpp)
 271                         kfree(argp->tmpp);
 272                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 273                 if (!p)
 274                         return NULL;
 275
 276         }
 277         memcpy(p, argp->p, avail);
 278         /* step to next page */
 279         argp->p = page_address(argp->pagelist[0]);
 280         argp->pagelist++;
 281         if (argp->pagelen < PAGE_SIZE) {
 282                 argp->end = p + (argp->pagelen>>2);
 283                 argp->pagelen = 0;
 284         } else {
 285                 argp->end = p + (PAGE_SIZE>>2);
 286                 argp->pagelen -= PAGE_SIZE;
 287         }
 288         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 289         argp->p += XDR_QUADLEN(nbytes - avail);
 290         return p;
 291 }
 292
 293 static int
 294 defer_free(struct nfsd4_compoundargs *argp,
 295                 void (*release)(const void *), void *p)
 296 {
 297         struct tmpbuf *tb;
 298
 299         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 300         if (!tb)
 301                 return -ENOMEM;
 302         tb->buf = p;
 303         tb->release = release;
 304         tb->next = argp->to_free;
 305         argp->to_free = tb;
 306         return 0;
 307 }
 308
 309 char *savemem(struct nfsd4_compoundargs *argp, u32 *p, int nbytes)
 310 {
 311         void *new = NULL;
 312         if (p == argp->tmp) {
 313                 new = kmalloc(nbytes, GFP_KERNEL);
 314                 if (!new) return NULL;
 315                 p = new;
 316                 memcpy(p, argp->tmp, nbytes);
 317         } else {
 318                 if (p != argp->tmpp)
 319                         BUG();
 320                 argp->tmpp = NULL;
 321         }
 322         if (defer_free(argp, kfree, p)) {
 323                 kfree(new);
 324                 return NULL;
 325         } else
 326                 return (char *)p;
 327 }
 328
 329
 330 static int
 331 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 332 {
 333         u32 bmlen;
 334         DECODE_HEAD;
 335
 336         bmval[0] = 0;
 337         bmval[1] = 0;
 338
 339         READ_BUF(4);
 340         READ32(bmlen);
 341         if (bmlen > 1000)
 342                 goto xdr_error;
 343
 344         READ_BUF(bmlen << 2);
 345         if (bmlen > 0)
 346                 READ32(bmval[0]);
 347         if (bmlen > 1)
 348                 READ32(bmval[1]);
 349
 350         DECODE_TAIL;
 351 }
 352
 353 static int
 354 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
 355     struct nfs4_acl **acl)
 356 {
 357         int expected_len, len = 0;
 358         u32 dummy32;
 359         char *buf;
 360
 361         DECODE_HEAD;
 362         iattr->ia_valid = 0;
 363         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 364                 return status;
 365
 366         /*
 367          * According to spec, unsupported attributes return ERR_NOTSUPP;
 368          * read-only attributes return ERR_INVAL.
 369          */
 370         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 371                 return nfserr_attrnotsupp;
 372         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
 373                 return nfserr_inval;
 374
 375         READ_BUF(4);
 376         READ32(expected_len);
 377
 378         if (bmval[0] & FATTR4_WORD0_SIZE) {
 379                 READ_BUF(8);
 380                 len += 8;
 381                 READ64(iattr->ia_size);
 382                 iattr->ia_valid |= ATTR_SIZE;
 383         }
 384         if (bmval[0] & FATTR4_WORD0_ACL) {
 385                 int nace, i;
 386                 struct nfs4_ace ace;
 387
 388                 READ_BUF(4); len += 4;
 389                 READ32(nace);
 390
 391                 *acl = nfs4_acl_new();
 392                 if (*acl == NULL) {
 393                         status = -ENOMEM;
 394                         goto out_nfserr;
 395                 }
 396                 defer_free(argp, (void (*)(const void *))nfs4_acl_free, *acl);
 397
 398                 for (i = 0; i < nace; i++) {
 399                         READ_BUF(16); len += 16;
 400                         READ32(ace.type);
 401                         READ32(ace.flag);
 402                         READ32(ace.access_mask);
 403                         READ32(dummy32);
 404                         READ_BUF(dummy32);
 405                         len += XDR_QUADLEN(dummy32) << 2;
 406                         READMEM(buf, dummy32);
 407                         if (check_utf8(buf, dummy32))
 408                                 return nfserr_inval;
 409                         ace.whotype = nfs4_acl_get_whotype(buf, dummy32);
 410                         status = 0;
 411                         if (ace.whotype != NFS4_ACL_WHO_NAMED)
 412                                 ace.who = 0;
 413                         else if (ace.flag & NFS4_ACE_IDENTIFIER_GROUP)
 414                                 status = nfsd_map_name_to_gid(argp->rqstp,
 415                                                 buf, dummy32, &ace.who);
 416                         else
 417                                 status = nfsd_map_name_to_uid(argp->rqstp,
 418                                                 buf, dummy32, &ace.who);
 419                         if (status)
 420                                 goto out_nfserr;
 421                         if (nfs4_acl_add_ace(*acl, ace.type, ace.flag,
 422                                  ace.access_mask, ace.whotype, ace.who) != 0) {
 423                                 status = -ENOMEM;
 424                                 goto out_nfserr;
 425                         }
 426                 }
 427         } else
 428                 *acl = NULL;
 429         if (bmval[1] & FATTR4_WORD1_MODE) {
 430                 READ_BUF(4);
 431                 len += 4;
 432                 READ32(iattr->ia_mode);
 433                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 434                 iattr->ia_valid |= ATTR_MODE;
 435         }
 436         if (bmval[1] & FATTR4_WORD1_OWNER) {
 437                 READ_BUF(4);
 438                 len += 4;
 439                 READ32(dummy32);
 440                 READ_BUF(dummy32);
 441                 len += (XDR_QUADLEN(dummy32) << 2);
 442                 READMEM(buf, dummy32);
 443                 if (check_utf8(buf, dummy32))
 444                         return nfserr_inval;
 445                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 446                         goto out_nfserr;
 447                 iattr->ia_valid |= ATTR_UID;
 448         }
 449         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 450                 READ_BUF(4);
 451                 len += 4;
 452                 READ32(dummy32);
 453                 READ_BUF(dummy32);
 454                 len += (XDR_QUADLEN(dummy32) << 2);
 455                 READMEM(buf, dummy32);
 456                 if (check_utf8(buf, dummy32))
 457                         return nfserr_inval;
 458                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 459                         goto out_nfserr;
 460                 iattr->ia_valid |= ATTR_GID;
 461         }
 462         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 463                 READ_BUF(4);
 464                 len += 4;
 465                 READ32(dummy32);
 466                 switch (dummy32) {
 467                 case NFS4_SET_TO_CLIENT_TIME:
 468                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 469                            all 32 bits of 'nseconds'. */
 470                         READ_BUF(12);
 471                         len += 12;
 472                         READ32(dummy32);
 473                         if (dummy32)
 474                                 return nfserr_inval;
 475                         READ32(iattr->ia_atime.tv_sec);
 476                         READ32(iattr->ia_atime.tv_nsec);
 477                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 478                                 return nfserr_inval;
 479                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 480                         break;
 481                 case NFS4_SET_TO_SERVER_TIME:
 482                         iattr->ia_valid |= ATTR_ATIME;
 483                         break;
 484                 default:
 485                         goto xdr_error;
 486                 }
 487         }
 488         if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
 489                 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 490                    all 32 bits of 'nseconds'. */
 491                 READ_BUF(12);
 492                 len += 12;
 493                 READ32(dummy32);
 494                 if (dummy32)
 495                         return nfserr_inval;
 496                 READ32(iattr->ia_ctime.tv_sec);
 497                 READ32(iattr->ia_ctime.tv_nsec);
 498                 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
 499                         return nfserr_inval;
 500                 iattr->ia_valid |= ATTR_CTIME;
 501         }
 502         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 503                 READ_BUF(4);
 504                 len += 4;
 505                 READ32(dummy32);
 506                 switch (dummy32) {
 507                 case NFS4_SET_TO_CLIENT_TIME:
 508                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 509                            all 32 bits of 'nseconds'. */
 510                         READ_BUF(12);
 511                         len += 12;
 512                         READ32(dummy32);
 513                         if (dummy32)
 514                                 return nfserr_inval;
 515                         READ32(iattr->ia_mtime.tv_sec);
 516                         READ32(iattr->ia_mtime.tv_nsec);
 517                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 518                                 return nfserr_inval;
 519                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 520                         break;
 521                 case NFS4_SET_TO_SERVER_TIME:
 522                         iattr->ia_valid |= ATTR_MTIME;
 523                         break;
 524                 default:
 525                         goto xdr_error;
 526                 }
 527         }
 528         if (len != expected_len)
 529                 goto xdr_error;
 530
 531         DECODE_TAIL;
 532
 533 out_nfserr:
 534         status = nfserrno(status);
 535         goto out;
 536 }
 537
 538 static int
 539 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 540 {
 541         DECODE_HEAD;
 542
 543         READ_BUF(4);
 544         READ32(access->ac_req_access);
 545
 546         DECODE_TAIL;
 547 }
 548
 549 #define NFS4_STATE_NOT_LOCKED   ((void *)-1)
 550
 551 static int
 552 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 553 {
 554         DECODE_HEAD;
 555
 556         close->cl_stateowner = NFS4_STATE_NOT_LOCKED;
 557         READ_BUF(4 + sizeof(stateid_t));
 558         READ32(close->cl_seqid);
 559         READ32(close->cl_stateid.si_generation);
 560         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
 561
 562         DECODE_TAIL;
 563 }
 564
 565
 566 static int
 567 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 568 {
 569         DECODE_HEAD;
 570
 571         READ_BUF(12);
 572         READ64(commit->co_offset);
 573         READ32(commit->co_count);
 574
 575         DECODE_TAIL;
 576 }
 577
 578 static int
 579 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 580 {
 581         DECODE_HEAD;
 582
 583         READ_BUF(4);
 584         READ32(create->cr_type);
 585         switch (create->cr_type) {
 586         case NF4LNK:
 587                 READ_BUF(4);
 588                 READ32(create->cr_linklen);
 589                 READ_BUF(create->cr_linklen);
 590                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 591                 if (check_utf8(create->cr_linkname, create->cr_linklen))
 592                         return nfserr_inval;
 593                 break;
 594         case NF4BLK:
 595         case NF4CHR:
 596                 READ_BUF(8);
 597                 READ32(create->cr_specdata1);
 598                 READ32(create->cr_specdata2);
 599                 break;
 600         case NF4SOCK:
 601         case NF4FIFO:
 602         case NF4DIR:
 603         default:
 604                 break;
 605         }
 606
 607         READ_BUF(4);
 608         READ32(create->cr_namelen);
 609         READ_BUF(create->cr_namelen);
 610         SAVEMEM(create->cr_name, create->cr_namelen);
 611         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 612                 return status;
 613
 614         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 615                 goto out;
 616
 617         DECODE_TAIL;
 618 }
 619
 620 static inline int
 621 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 622 {
 623         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 624 }
 625
 626 static int
 627 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 628 {
 629         DECODE_HEAD;
 630
 631         READ_BUF(4);
 632         READ32(link->li_namelen);
 633         READ_BUF(link->li_namelen);
 634         SAVEMEM(link->li_name, link->li_namelen);
 635         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 636                 return status;
 637
 638         DECODE_TAIL;
 639 }
 640
 641 static int
 642 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 643 {
 644         DECODE_HEAD;
 645
 646         lock->lk_stateowner = NFS4_STATE_NOT_LOCKED;
 647         /*
 648         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 649         */
 650         READ_BUF(28);
 651         READ32(lock->lk_type);
 652         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 653                 goto xdr_error;
 654         READ32(lock->lk_reclaim);
 655         READ64(lock->lk_offset);
 656         READ64(lock->lk_length);
 657         READ32(lock->lk_is_new);
 658
 659         if (lock->lk_is_new) {
 660                 READ_BUF(36);
 661                 READ32(lock->lk_new_open_seqid);
 662                 READ32(lock->lk_new_open_stateid.si_generation);
 663
 664                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
 665                 READ32(lock->lk_new_lock_seqid);
 666                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 667                 READ32(lock->lk_new_owner.len);
 668                 READ_BUF(lock->lk_new_owner.len);
 669                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 670         } else {
 671                 READ_BUF(20);
 672                 READ32(lock->lk_old_lock_stateid.si_generation);
 673                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
 674                 READ32(lock->lk_old_lock_seqid);
 675         }
 676
 677         DECODE_TAIL;
 678 }
 679
 680 static int
 681 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 682 {
 683         DECODE_HEAD;
 684
 685         READ_BUF(32);
 686         READ32(lockt->lt_type);
 687         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 688                 goto xdr_error;
 689         READ64(lockt->lt_offset);
 690         READ64(lockt->lt_length);
 691         COPYMEM(&lockt->lt_clientid, 8);
 692         READ32(lockt->lt_owner.len);
 693         READ_BUF(lockt->lt_owner.len);
 694         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 695
 696         DECODE_TAIL;
 697 }
 698
 699 static int
 700 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 701 {
 702         DECODE_HEAD;
 703
 704         locku->lu_stateowner = NFS4_STATE_NOT_LOCKED;
 705         READ_BUF(24 + sizeof(stateid_t));
 706         READ32(locku->lu_type);
 707         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 708                 goto xdr_error;
 709         READ32(locku->lu_seqid);
 710         READ32(locku->lu_stateid.si_generation);
 711         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
 712         READ64(locku->lu_offset);
 713         READ64(locku->lu_length);
 714
 715         DECODE_TAIL;
 716 }
 717
 718 static int
 719 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 720 {
 721         DECODE_HEAD;
 722
 723         READ_BUF(4);
 724         READ32(lookup->lo_len);
 725         READ_BUF(lookup->lo_len);
 726         SAVEMEM(lookup->lo_name, lookup->lo_len);
 727         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 728                 return status;
 729
 730         DECODE_TAIL;
 731 }
 732
 733 static int
 734 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 735 {
 736         DECODE_HEAD;
 737
 738         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 739         open->op_iattr.ia_valid = 0;
 740         open->op_stateowner = NFS4_STATE_NOT_LOCKED;
 741
 742         /* seqid, share_access, share_deny, clientid, ownerlen */
 743         READ_BUF(16 + sizeof(clientid_t));
 744         READ32(open->op_seqid);
 745         READ32(open->op_share_access);
 746         READ32(open->op_share_deny);
 747         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 748         READ32(open->op_owner.len);
 749
 750         /* owner, open_flag */
 751         READ_BUF(open->op_owner.len + 4);
 752         SAVEMEM(open->op_owner.data, open->op_owner.len);
 753         READ32(open->op_create);
 754         switch (open->op_create) {
 755         case NFS4_OPEN_NOCREATE:
 756                 break;
 757         case NFS4_OPEN_CREATE:
 758                 READ_BUF(4);
 759                 READ32(open->op_createmode);
 760                 switch (open->op_createmode) {
 761                 case NFS4_CREATE_UNCHECKED:
 762                 case NFS4_CREATE_GUARDED:
 763                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 764                                 goto out;
 765                         break;
 766                 case NFS4_CREATE_EXCLUSIVE:
 767                         READ_BUF(8);
 768                         COPYMEM(open->op_verf.data, 8);
 769                         break;
 770                 default:
 771                         goto xdr_error;
 772                 }
 773                 break;
 774         default:
 775                 goto xdr_error;
 776         }
 777
 778         /* open_claim */
 779         READ_BUF(4);
 780         READ32(open->op_claim_type);
 781         switch (open->op_claim_type) {
 782         case NFS4_OPEN_CLAIM_NULL:
 783         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 784                 READ_BUF(4);
 785                 READ32(open->op_fname.len);
 786                 READ_BUF(open->op_fname.len);
 787                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 788                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 789                         return status;
 790                 break;
 791         case NFS4_OPEN_CLAIM_PREVIOUS:
 792                 READ_BUF(4);
 793                 READ32(open->op_delegate_type);
 794                 break;
 795         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 796                 READ_BUF(sizeof(delegation_stateid_t) + 4);
 797                 COPYMEM(&open->op_delegate_stateid, sizeof(delegation_stateid_t));
 798                 READ32(open->op_fname.len);
 799                 READ_BUF(open->op_fname.len);
 800                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 801                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 802                         return status;
 803                 break;
 804         default:
 805                 goto xdr_error;
 806         }
 807
 808         DECODE_TAIL;
 809 }
 810
 811 static int
 812 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 813 {
 814         DECODE_HEAD;
 815
 816         open_conf->oc_stateowner = NFS4_STATE_NOT_LOCKED;
 817         READ_BUF(4 + sizeof(stateid_t));
 818         READ32(open_conf->oc_req_stateid.si_generation);
 819         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
 820         READ32(open_conf->oc_seqid);
 821
 822         DECODE_TAIL;
 823 }
 824
 825 static int
 826 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 827 {
 828         DECODE_HEAD;
 829
 830         open_down->od_stateowner = NFS4_STATE_NOT_LOCKED;
 831         READ_BUF(4 + sizeof(stateid_t));
 832         READ32(open_down->od_stateid.si_generation);
 833         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
 834         READ32(open_down->od_seqid);
 835         READ32(open_down->od_share_access);
 836         READ32(open_down->od_share_deny);
 837
 838         DECODE_TAIL;
 839 }
 840
 841 static int
 842 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 843 {
 844         DECODE_HEAD;
 845
 846         READ_BUF(4);
 847         READ32(putfh->pf_fhlen);
 848         if (putfh->pf_fhlen > NFS4_FHSIZE)
 849                 goto xdr_error;
 850         READ_BUF(putfh->pf_fhlen);
 851         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 852
 853         DECODE_TAIL;
 854 }
 855
 856 static int
 857 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 858 {
 859         DECODE_HEAD;
 860
 861         READ_BUF(sizeof(stateid_t) + 12);
 862         READ32(read->rd_stateid.si_generation);
 863         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
 864         READ64(read->rd_offset);
 865         READ32(read->rd_length);
 866
 867         DECODE_TAIL;
 868 }
 869
 870 static int
 871 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 872 {
 873         DECODE_HEAD;
 874
 875         READ_BUF(24);
 876         READ64(readdir->rd_cookie);
 877         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 878         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 879         READ32(readdir->rd_maxcount);
 880         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 881                 goto out;
 882
 883         DECODE_TAIL;
 884 }
 885
 886 static int
 887 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 888 {
 889         DECODE_HEAD;
 890
 891         READ_BUF(4);
 892         READ32(remove->rm_namelen);
 893         READ_BUF(remove->rm_namelen);
 894         SAVEMEM(remove->rm_name, remove->rm_namelen);
 895         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 896                 return status;
 897
 898         DECODE_TAIL;
 899 }
 900
 901 static int
 902 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 903 {
 904         DECODE_HEAD;
 905
 906         READ_BUF(4);
 907         READ32(rename->rn_snamelen);
 908         READ_BUF(rename->rn_snamelen + 4);
 909         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 910         READ32(rename->rn_tnamelen);
 911         READ_BUF(rename->rn_tnamelen);
 912         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 913         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 914                 return status;
 915         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 916                 return status;
 917
 918         DECODE_TAIL;
 919 }
 920
 921 static int
 922 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 923 {
 924         DECODE_HEAD;
 925
 926         READ_BUF(sizeof(clientid_t));
 927         COPYMEM(clientid, sizeof(clientid_t));
 928
 929         DECODE_TAIL;
 930 }
 931
 932 static int
 933 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 934 {
 935         DECODE_HEAD;
 936
 937         READ_BUF(sizeof(stateid_t));
 938         READ32(setattr->sa_stateid.si_generation);
 939         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 940         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 941                 goto out;
 942
 943         DECODE_TAIL;
 944 }
 945
 946 static int
 947 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 948 {
 949         DECODE_HEAD;
 950
 951         READ_BUF(12);
 952         COPYMEM(setclientid->se_verf.data, 8);
 953         READ32(setclientid->se_namelen);
 954
 955         READ_BUF(setclientid->se_namelen + 8);
 956         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 957         READ32(setclientid->se_callback_prog);
 958         READ32(setclientid->se_callback_netid_len);
 959
 960         READ_BUF(setclientid->se_callback_netid_len + 4);
 961         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 962         READ32(setclientid->se_callback_addr_len);
 963
 964         READ_BUF(setclientid->se_callback_addr_len + 4);
 965         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 966         READ32(setclientid->se_callback_ident);
 967
 968         DECODE_TAIL;
 969 }
 970
 971 static int
 972 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 973 {
 974         DECODE_HEAD;
 975
 976         READ_BUF(8 + sizeof(nfs4_verifier));
 977         COPYMEM(&scd_c->sc_clientid, 8);
 978         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 979
 980         DECODE_TAIL;
 981 }
 982
 983 /* Also used for NVERIFY */
 984 static int
 985 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 986 {
 987 #if 0
 988         struct nfsd4_compoundargs save = {
 989                 .p = argp->p,
 990                 .end = argp->end,
 991                 .rqstp = argp->rqstp,
 992         };
 993         u32             ve_bmval[2];
 994         struct iattr    ve_iattr;           /* request */
 995         struct nfs4_acl *ve_acl;            /* request */
 996 #endif
 997         DECODE_HEAD;
 998
 999         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1000                 goto out;
1001
1002         /* For convenience's sake, we compare raw xdr'd attributes in
1003          * nfsd4_proc_verify; however we still decode here just to return
1004          * correct error in case of bad xdr. */
1005 #if 0
1006         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
1007         if (status == nfserr_inval) {
1008                 status = nfserrno(status);
1009                 goto out;
1010         }
1011 #endif
1012         READ_BUF(4);
1013         READ32(verify->ve_attrlen);
1014         READ_BUF(verify->ve_attrlen);
1015         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1016
1017         DECODE_TAIL;
1018 }
1019
1020 static int
1021 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1022 {
1023         int avail;
1024         int v;
1025         int len;
1026         DECODE_HEAD;
1027
1028         READ_BUF(sizeof(stateid_opaque_t) + 20);
1029         READ32(write->wr_stateid.si_generation);
1030         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
1031         READ64(write->wr_offset);
1032         READ32(write->wr_stable_how);
1033         if (write->wr_stable_how > 2)
1034                 goto xdr_error;
1035         READ32(write->wr_buflen);
1036
1037         /* Sorry .. no magic macros for this.. *
1038          * READ_BUF(write->wr_buflen);
1039          * SAVEMEM(write->wr_buf, write->wr_buflen);
1040          */
1041         avail = (char*)argp->end - (char*)argp->p;
1042         if (avail + argp->pagelen < write->wr_buflen) {
1043                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__);
1044                 goto xdr_error;
1045         }
1046         write->wr_vec[0].iov_base = p;
1047         write->wr_vec[0].iov_len = avail;
1048         v = 0;
1049         len = write->wr_buflen;
1050         while (len > write->wr_vec[v].iov_len) {
1051                 len -= write->wr_vec[v].iov_len;
1052                 v++;
1053                 write->wr_vec[v].iov_base = page_address(argp->pagelist[0]);
1054                 argp->pagelist++;
1055                 if (argp->pagelen >= PAGE_SIZE) {
1056                         write->wr_vec[v].iov_len = PAGE_SIZE;
1057                         argp->pagelen -= PAGE_SIZE;
1058                 } else {
1059                         write->wr_vec[v].iov_len = argp->pagelen;
1060                         argp->pagelen -= len;
1061                 }
1062         }
1063         argp->end = (u32*) (write->wr_vec[v].iov_base + write->wr_vec[v].iov_len);
1064         argp->p = (u32*)  (write->wr_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1065         write->wr_vec[v].iov_len = len;
1066         write->wr_vlen = v+1;
1067
1068         DECODE_TAIL;
1069 }
1070
1071 static int
1072 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1073 {
1074         DECODE_HEAD;
1075
1076         READ_BUF(12);
1077         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1078         READ32(rlockowner->rl_owner.len);
1079         READ_BUF(rlockowner->rl_owner.len);
1080         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1081
1082         DECODE_TAIL;
1083 }
1084
1085 static int
1086 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1087 {
1088         DECODE_HEAD;
1089         struct nfsd4_op *op;
1090         int i;
1091
1092         /*
1093          * XXX: According to spec, we should check the tag
1094          * for UTF-8 compliance.  I'm postponing this for
1095          * now because it seems that some clients do use
1096          * binary tags.
1097          */
1098         READ_BUF(4);
1099         READ32(argp->taglen);
1100         READ_BUF(argp->taglen + 8);
1101         SAVEMEM(argp->tag, argp->taglen);
1102         READ32(argp->minorversion);
1103         READ32(argp->opcnt);
1104
1105         if (argp->taglen > NFSD4_MAX_TAGLEN)
1106                 goto xdr_error;
1107         if (argp->opcnt > 100)
1108                 goto xdr_error;
1109
1110         if (argp->opcnt > sizeof(argp->iops)/sizeof(argp->iops[0])) {
1111                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1112                 if (!argp->ops) {
1113                         argp->ops = argp->iops;
1114                         printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
1115                         goto xdr_error;
1116                 }
1117         }
1118
1119         for (i = 0; i < argp->opcnt; i++) {
1120                 op = &argp->ops[i];
1121                 op->replay = NULL;
1122
1123                 /*
1124                  * We can't use READ_BUF() here because we need to handle
1125                  * a missing opcode as an OP_WRITE + 1. So we need to check
1126                  * to see if we're truly at the end of our buffer or if there
1127                  * is another page we need to flip to.
1128                  */
1129
1130                 if (argp->p == argp->end) {
1131                         if (argp->pagelen < 4) {
1132                                 /* There isn't an opcode still on the wire */
1133                                 op->opnum = OP_WRITE + 1;
1134                                 op->status = nfserr_bad_xdr;
1135                                 argp->opcnt = i+1;
1136                                 break;
1137                         }
1138
1139                         /*
1140                          * False alarm. We just hit a page boundary, but there
1141                          * is still data available.  Move pointer across page
1142                          * boundary.  *snip from READ_BUF*
1143                          */
1144                         argp->p = page_address(argp->pagelist[0]);
1145                         argp->pagelist++;
1146                         if (argp->pagelen < PAGE_SIZE) {
1147                                 argp->end = p + (argp->pagelen>>2);
1148                                 argp->pagelen = 0;
1149                         } else {
1150                                 argp->end = p + (PAGE_SIZE>>2);
1151                                 argp->pagelen -= PAGE_SIZE;
1152                         }
1153                 }
1154                 op->opnum = ntohl(*argp->p++);
1155
1156                 switch (op->opnum) {
1157                 case 2: /* Reserved operation */
1158                         op->opnum = OP_ILLEGAL;
1159                         if (argp->minorversion == 0)
1160                                 op->status = nfserr_op_illegal;
1161                         else
1162                                 op->status = nfserr_minor_vers_mismatch;
1163                         break;
1164                 case OP_ACCESS:
1165                         op->status = nfsd4_decode_access(argp, &op->u.access);
1166                         break;
1167                 case OP_CLOSE:
1168                         op->status = nfsd4_decode_close(argp, &op->u.close);
1169                         break;
1170                 case OP_COMMIT:
1171                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1172                         break;
1173                 case OP_CREATE:
1174                         op->status = nfsd4_decode_create(argp, &op->u.create);
1175                         break;
1176                 case OP_GETATTR:
1177                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1178                         break;
1179                 case OP_GETFH:
1180                         op->status = nfs_ok;
1181                         break;
1182                 case OP_LINK:
1183                         op->status = nfsd4_decode_link(argp, &op->u.link);
1184                         break;
1185                 case OP_LOCK:
1186                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1187                         break;
1188                 case OP_LOCKT:
1189                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1190                         break;
1191                 case OP_LOCKU:
1192                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1193                         break;
1194                 case OP_LOOKUP:
1195                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1196                         break;
1197                 case OP_LOOKUPP:
1198                         op->status = nfs_ok;
1199                         break;
1200                 case OP_NVERIFY:
1201                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1202                         break;
1203                 case OP_OPEN:
1204                         op->status = nfsd4_decode_open(argp, &op->u.open);
1205                         break;
1206                 case OP_OPEN_CONFIRM:
1207                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1208                         break;
1209                 case OP_OPEN_DOWNGRADE:
1210                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1211                         break;
1212                 case OP_PUTFH:
1213                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1214                         break;
1215                 case OP_PUTROOTFH:
1216                         op->status = nfs_ok;
1217                         break;
1218                 case OP_READ:
1219                         op->status = nfsd4_decode_read(argp, &op->u.read);
1220                         break;
1221                 case OP_READDIR:
1222                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1223                         break;
1224                 case OP_READLINK:
1225                         op->status = nfs_ok;
1226                         break;
1227                 case OP_REMOVE:
1228                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1229                         break;
1230                 case OP_RENAME:
1231                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1232                         break;
1233                 case OP_RESTOREFH:
1234                         op->status = nfs_ok;
1235                         break;
1236                 case OP_RENEW:
1237                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1238                         break;
1239                 case OP_SAVEFH:
1240                         op->status = nfs_ok;
1241                         break;
1242                 case OP_SETATTR:
1243                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1244                         break;
1245                 case OP_SETCLIENTID:
1246                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1247                         break;
1248                 case OP_SETCLIENTID_CONFIRM:
1249                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1250                         break;
1251                 case OP_VERIFY:
1252                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1253                         break;
1254                 case OP_WRITE:
1255                         op->status = nfsd4_decode_write(argp, &op->u.write);
1256                         break;
1257                 case OP_RELEASE_LOCKOWNER:
1258                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1259                         break;
1260                 default:
1261                         op->opnum = OP_ILLEGAL;
1262                         op->status = nfserr_op_illegal;
1263                         break;
1264                 }
1265
1266                 if (op->status) {
1267                         argp->opcnt = i+1;
1268                         break;
1269                 }
1270         }
1271
1272         DECODE_TAIL;
1273 }
1274 /*
1275  * END OF "GENERIC" DECODE ROUTINES.
1276  */
1277
1278 /*
1279  * START OF "GENERIC" ENCODE ROUTINES.
1280  *   These may look a little ugly since they are imported from a "generic"
1281  * set of XDR encode/decode routines which are intended to be shared by
1282  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1283  *
1284  * If the pain of reading these is too great, it should be a straightforward
1285  * task to translate them into Linux-specific versions which are more
1286  * consistent with the style used in NFSv2/v3...
1287  */
1288 #define ENCODE_HEAD              u32 *p
1289
1290 #define WRITE32(n)               *p++ = htonl(n)
1291 #define WRITE64(n)               do {                           \
1292         *p++ = htonl((u32)((n) >> 32));                         \
1293         *p++ = htonl((u32)(n));                                 \
1294 } while (0)
1295 #define WRITEMEM(ptr,nbytes)     do {                           \
1296         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1297         memcpy(p, ptr, nbytes);                                 \
1298         p += XDR_QUADLEN(nbytes);                               \
1299 } while (0)
1300 #define WRITECINFO(c)           do {                            \
1301         *p++ = htonl(c.atomic);                                 \
1302         *p++ = htonl(c.before_ctime_sec);                               \
1303         *p++ = htonl(c.before_ctime_nsec);                              \
1304         *p++ = htonl(c.after_ctime_sec);                                \
1305         *p++ = htonl(c.after_ctime_nsec);                               \
1306 } while (0)
1307
1308 #define RESERVE_SPACE(nbytes)   do {                            \
1309         p = resp->p;                                            \
1310         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1311 } while (0)
1312 #define ADJUST_ARGS()           resp->p = p
1313
1314 /*
1315  * Header routine to setup seqid operation replay cache
1316  */
1317 #define ENCODE_SEQID_OP_HEAD                                    \
1318         u32 *p;                                                 \
1319         u32 *save;                                              \
1320                                                                 \
1321         save = resp->p;
1322
1323 /*
1324  * Routine for encoding the result of a
1325  * "seqid-mutating" NFSv4 operation.  This is
1326  * where seqids are incremented, and the
1327  * replay cache is filled.
1328  */
1329
1330 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1331         if (seqid_mutating_err(nfserr) && stateowner            \
1332             && (stateowner != NFS4_STATE_NOT_LOCKED)) {         \
1333                 if (stateowner->so_confirmed)                   \
1334                         stateowner->so_seqid++;                 \
1335                 stateowner->so_replay.rp_status = nfserr;       \
1336                 stateowner->so_replay.rp_buflen =               \
1337                           (((char *)(resp)->p - (char *)save)); \
1338                 memcpy(stateowner->so_replay.rp_buf, save,      \
1339                         stateowner->so_replay.rp_buflen);       \
1340         }                                                       \
1341         if (stateowner != NFS4_STATE_NOT_LOCKED)                \
1342                 nfs4_unlock_state();                            \
1343         } while (0);
1344
1345
1346 static u32 nfs4_ftypes[16] = {
1347         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1348         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1349         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1350         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1351 };
1352
1353 static int
1354 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1355                         u32 **p, int *buflen)
1356 {
1357         int status;
1358
1359         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1360                 return nfserr_resource;
1361         if (whotype != NFS4_ACL_WHO_NAMED)
1362                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1363         else if (group)
1364                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1365         else
1366                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1367         if (status < 0)
1368                 return nfserrno(status);
1369         *p = xdr_encode_opaque(*p, NULL, status);
1370         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1371         BUG_ON(*buflen < 0);
1372         return 0;
1373 }
1374
1375 static inline int
1376 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, u32 **p, int *buflen)
1377 {
1378         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1379 }
1380
1381 static inline int
1382 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, u32 **p, int *buflen)
1383 {
1384         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1385 }
1386
1387 static inline int
1388 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1389                 u32 **p, int *buflen)
1390 {
1391         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1392 }
1393
1394
1395 /*
1396  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1397  * ourselves.
1398  *
1399  * @countp is the buffer size in _words_; upon successful return this becomes
1400  * replaced with the number of words written.
1401  */
1402 int
1403 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1404                 struct dentry *dentry, u32 *buffer, int *countp, u32 *bmval,
1405                 struct svc_rqst *rqstp)
1406 {
1407         u32 bmval0 = bmval[0];
1408         u32 bmval1 = bmval[1];
1409         struct kstat stat;
1410         struct svc_fh tempfh;
1411         struct kstatfs statfs;
1412         int buflen = *countp << 2;
1413         u32 *attrlenp;
1414         u32 dummy;
1415         u64 dummy64;
1416         u32 *p = buffer;
1417         int status;
1418         int aclsupport = 0;
1419         struct nfs4_acl *acl = NULL;
1420
1421         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1422         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1423         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1424
1425         status = vfs_getattr(exp->ex_mnt, dentry, &stat);
1426         if (status)
1427                 goto out_nfserr;
1428         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1429             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1430                        FATTR4_WORD1_SPACE_TOTAL))) {
1431                 status = vfs_statfs(dentry->d_inode->i_sb, &statfs);
1432                 if (status)
1433                         goto out_nfserr;
1434         }
1435         if ((bmval0 & FATTR4_WORD0_FILEHANDLE) && !fhp) {
1436                 fh_init(&tempfh, NFS4_FHSIZE);
1437                 status = fh_compose(&tempfh, exp, dentry, NULL);
1438                 if (status)
1439                         goto out;
1440                 fhp = &tempfh;
1441         }
1442         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1443                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1444                 status = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1445                 aclsupport = (status == 0);
1446                 if (bmval0 & FATTR4_WORD0_ACL) {
1447                         if (status == -EOPNOTSUPP)
1448                                 bmval0 &= ~FATTR4_WORD0_ACL;
1449                         else if (status != 0)
1450                                 goto out_nfserr;
1451                 }
1452         }
1453         if ((buflen -= 16) < 0)
1454                 goto out_resource;
1455
1456         WRITE32(2);
1457         WRITE32(bmval0);
1458         WRITE32(bmval1);
1459         attrlenp = p++;                /* to be backfilled later */
1460
1461         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1462                 if ((buflen -= 12) < 0)
1463                         goto out_resource;
1464                 WRITE32(2);
1465                 WRITE32(aclsupport ?
1466                         NFSD_SUPPORTED_ATTRS_WORD0 :
1467                         NFSD_SUPPORTED_ATTRS_WORD0 & ~FATTR4_WORD0_ACL);
1468                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1469         }
1470         if (bmval0 & FATTR4_WORD0_TYPE) {
1471                 if ((buflen -= 4) < 0)
1472                         goto out_resource;
1473                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1474                 if (dummy == NF4BAD)
1475                         goto out_serverfault;
1476                 WRITE32(dummy);
1477         }
1478         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1479                 if ((buflen -= 4) < 0)
1480                         goto out_resource;
1481                 WRITE32( NFS4_FH_NOEXPIRE_WITH_OPEN | NFS4_FH_VOL_RENAME );
1482         }
1483         if (bmval0 & FATTR4_WORD0_CHANGE) {
1484                 /*
1485                  * Note: This _must_ be consistent with the scheme for writing
1486                  * change_info, so any changes made here must be reflected there
1487                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1488                  * macro above.)
1489                  */
1490                 if ((buflen -= 8) < 0)
1491                         goto out_resource;
1492                 WRITE32(stat.ctime.tv_sec);
1493                 WRITE32(stat.ctime.tv_nsec);
1494         }
1495         if (bmval0 & FATTR4_WORD0_SIZE) {
1496                 if ((buflen -= 8) < 0)
1497                         goto out_resource;
1498                 WRITE64(stat.size);
1499         }
1500         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1501                 if ((buflen -= 4) < 0)
1502                         goto out_resource;
1503                 WRITE32(1);
1504         }
1505         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1506                 if ((buflen -= 4) < 0)
1507                         goto out_resource;
1508                 WRITE32(1);
1509         }
1510         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1511                 if ((buflen -= 4) < 0)
1512                         goto out_resource;
1513                 WRITE32(0);
1514         }
1515         if (bmval0 & FATTR4_WORD0_FSID) {
1516                 if ((buflen -= 16) < 0)
1517                         goto out_resource;
1518                 WRITE32(0);
1519                 WRITE32(MAJOR(stat.dev));
1520                 WRITE32(0);
1521                 WRITE32(MINOR(stat.dev));
1522         }
1523         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1524                 if ((buflen -= 4) < 0)
1525                         goto out_resource;
1526                 WRITE32(0);
1527         }
1528         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1529                 if ((buflen -= 4) < 0)
1530                         goto out_resource;
1531                 WRITE32(NFSD_LEASE_TIME);
1532         }
1533         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1534                 if ((buflen -= 4) < 0)
1535                         goto out_resource;
1536                 WRITE32(0);
1537         }
1538         if (bmval0 & FATTR4_WORD0_ACL) {
1539                 struct nfs4_ace *ace;
1540                 struct list_head *h;
1541
1542                 if (acl == NULL) {
1543                         if ((buflen -= 4) < 0)
1544                                 goto out_resource;
1545
1546                         WRITE32(0);
1547                         goto out_acl;
1548                 }
1549                 if ((buflen -= 4) < 0)
1550                         goto out_resource;
1551                 WRITE32(acl->naces);
1552
1553                 list_for_each(h, &acl->ace_head) {
1554                         ace = list_entry(h, struct nfs4_ace, l_ace);
1555
1556                         if ((buflen -= 4*3) < 0)
1557                                 goto out_resource;
1558                         WRITE32(ace->type);
1559                         WRITE32(ace->flag);
1560                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1561                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1562                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1563                                 &p, &buflen);
1564                         if (status == nfserr_resource)
1565                                 goto out_resource;
1566                         if (status)
1567                                 goto out;
1568                 }
1569         }
1570 out_acl:
1571         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1572                 if ((buflen -= 4) < 0)
1573                         goto out_resource;
1574                 WRITE32(aclsupport ?
1575                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1576         }
1577         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1578                 if ((buflen -= 4) < 0)
1579                         goto out_resource;
1580                 WRITE32(1);
1581         }
1582         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1583                 if ((buflen -= 4) < 0)
1584                         goto out_resource;
1585                 WRITE32(1);
1586         }
1587         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1588                 if ((buflen -= 4) < 0)
1589                         goto out_resource;
1590                 WRITE32(1);
1591         }
1592         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1593                 if ((buflen -= 4) < 0)
1594                         goto out_resource;
1595                 WRITE32(1);
1596         }
1597         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1598                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1599                 if (buflen < 0)
1600                         goto out_resource;
1601                 WRITE32(fhp->fh_handle.fh_size);
1602                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1603         }
1604         if (bmval0 & FATTR4_WORD0_FILEID) {
1605                 if ((buflen -= 8) < 0)
1606                         goto out_resource;
1607                 WRITE64((u64) stat.ino);
1608         }
1609         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1610                 if ((buflen -= 8) < 0)
1611                         goto out_resource;
1612                 WRITE64((u64) statfs.f_ffree);
1613         }
1614         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1615                 if ((buflen -= 8) < 0)
1616                         goto out_resource;
1617                 WRITE64((u64) statfs.f_ffree);
1618         }
1619         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1620                 if ((buflen -= 8) < 0)
1621                         goto out_resource;
1622                 WRITE64((u64) statfs.f_files);
1623         }
1624         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1625                 if ((buflen -= 4) < 0)
1626                         goto out_resource;
1627                 WRITE32(1);
1628         }
1629         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1630                 if ((buflen -= 8) < 0)
1631                         goto out_resource;
1632                 WRITE64(~(u64)0);
1633         }
1634         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1635                 if ((buflen -= 4) < 0)
1636                         goto out_resource;
1637                 WRITE32(255);
1638         }
1639         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1640                 if ((buflen -= 4) < 0)
1641                         goto out_resource;
1642                 WRITE32(~(u32) 0);
1643         }
1644         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1645                 if ((buflen -= 8) < 0)
1646                         goto out_resource;
1647                 WRITE64((u64) NFSSVC_MAXBLKSIZE);
1648         }
1649         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1650                 if ((buflen -= 8) < 0)
1651                         goto out_resource;
1652                 WRITE64((u64) NFSSVC_MAXBLKSIZE);
1653         }
1654         if (bmval1 & FATTR4_WORD1_MODE) {
1655                 if ((buflen -= 4) < 0)
1656                         goto out_resource;
1657                 WRITE32(stat.mode & S_IALLUGO);
1658         }
1659         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1660                 if ((buflen -= 4) < 0)
1661                         goto out_resource;
1662                 WRITE32(1);
1663         }
1664         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1665                 if ((buflen -= 4) < 0)
1666                         goto out_resource;
1667                 WRITE32(stat.nlink);
1668         }
1669         if (bmval1 & FATTR4_WORD1_OWNER) {
1670                 status = nfsd4_encode_user(rqstp,
1671                         XIDINO_UID(XID_TAG(dentry->d_inode),
1672                         stat.uid, stat.xid), &p, &buflen);
1673                 if (status == nfserr_resource)
1674                         goto out_resource;
1675                 if (status)
1676                         goto out;
1677         }
1678         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1679                 status = nfsd4_encode_group(rqstp,
1680                         XIDINO_GID(XID_TAG(dentry->d_inode),
1681                         stat.gid, stat.xid), &p, &buflen);
1682                 if (status == nfserr_resource)
1683                         goto out_resource;
1684                 if (status)
1685                         goto out;
1686         }
1687         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1688                 if ((buflen -= 8) < 0)
1689                         goto out_resource;
1690                 WRITE32((u32) MAJOR(stat.rdev));
1691                 WRITE32((u32) MINOR(stat.rdev));
1692         }
1693         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1694                 if ((buflen -= 8) < 0)
1695                         goto out_resource;
1696                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1697                 WRITE64(dummy64);
1698         }
1699         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1700                 if ((buflen -= 8) < 0)
1701                         goto out_resource;
1702                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1703                 WRITE64(dummy64);
1704         }
1705         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1706                 if ((buflen -= 8) < 0)
1707                         goto out_resource;
1708                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1709                 WRITE64(dummy64);
1710         }
1711         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1712                 if ((buflen -= 8) < 0)
1713                         goto out_resource;
1714                 dummy64 = (u64)stat.blocks << 9;
1715                 WRITE64(dummy64);
1716         }
1717         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1718                 if ((buflen -= 12) < 0)
1719                         goto out_resource;
1720                 WRITE32(0);
1721                 WRITE32(stat.atime.tv_sec);
1722                 WRITE32(stat.atime.tv_nsec);
1723         }
1724         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1725                 if ((buflen -= 12) < 0)
1726                         goto out_resource;
1727                 WRITE32(0);
1728                 WRITE32(1);
1729                 WRITE32(0);
1730         }
1731         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1732                 if ((buflen -= 12) < 0)
1733                         goto out_resource;
1734                 WRITE32(0);
1735                 WRITE32(stat.ctime.tv_sec);
1736                 WRITE32(stat.ctime.tv_nsec);
1737         }
1738         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1739                 if ((buflen -= 12) < 0)
1740                         goto out_resource;
1741                 WRITE32(0);
1742                 WRITE32(stat.mtime.tv_sec);
1743                 WRITE32(stat.mtime.tv_nsec);
1744         }
1745         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1746                 struct dentry *mnt_pnt, *mnt_root;
1747
1748                 if ((buflen -= 8) < 0)
1749                         goto out_resource;
1750                 mnt_root = exp->ex_mnt->mnt_root;
1751                 if (mnt_root->d_inode == dentry->d_inode) {
1752                         mnt_pnt = exp->ex_mnt->mnt_mountpoint;
1753                         WRITE64((u64) mnt_pnt->d_inode->i_ino);
1754                 } else
1755                         WRITE64((u64) stat.ino);
1756         }
1757         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1758         *countp = p - buffer;
1759         status = nfs_ok;
1760
1761 out:
1762         nfs4_acl_free(acl);
1763         if (fhp == &tempfh)
1764                 fh_put(&tempfh);
1765         return status;
1766 out_nfserr:
1767         status = nfserrno(status);
1768         goto out;
1769 out_resource:
1770         *countp = 0;
1771         status = nfserr_resource;
1772         goto out;
1773 out_serverfault:
1774         status = nfserr_serverfault;
1775         goto out;
1776 }
1777
1778 static int
1779 nfsd4_encode_dirent(struct readdir_cd *ccd, const char *name, int namlen,
1780                     loff_t offset, ino_t ino, unsigned int d_type)
1781 {
1782         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1783         int buflen;
1784         u32 *p = cd->buffer;
1785         u32 *attrlenp;
1786         struct dentry *dentry;
1787         struct svc_export *exp = cd->rd_fhp->fh_export;
1788         u32 bmval0, bmval1;
1789         int nfserr = 0;
1790
1791         /* In nfsv4, "." and ".." never make it onto the wire.. */
1792         if (name && isdotent(name, namlen)) {
1793                 cd->common.err = nfs_ok;
1794                 return 0;
1795         }
1796
1797         if (cd->offset)
1798                 xdr_encode_hyper(cd->offset, (u64) offset);
1799
1800         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1801         if (buflen < 0)
1802                 goto nospc;
1803
1804         *p++ = xdr_one;                             /* mark entry present */
1805         cd->offset = p;                             /* remember pointer */
1806         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1807         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1808
1809         /*
1810          * Now we come to the ugly part: writing the fattr for this entry.
1811          */
1812         bmval0 = cd->rd_bmval[0];
1813         bmval1 = cd->rd_bmval[1];
1814         if ((bmval0 & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_FILEID)) || bmval1)  {
1815                 /*
1816                  * "Heavyweight" case: we have no choice except to
1817                  * call nfsd4_encode_fattr().
1818                  */
1819                 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1820                 if (IS_ERR(dentry)) {
1821                         nfserr = nfserrno(PTR_ERR(dentry));
1822                         goto error;
1823                 }
1824
1825                 exp_get(exp);
1826                 if (d_mountpoint(dentry)) {
1827                         if ((nfserr = nfsd_cross_mnt(cd->rd_rqstp, &dentry,
1828                                          &exp))) {
1829                         /*
1830                          * -EAGAIN is the only error returned from
1831                          * nfsd_cross_mnt() and it indicates that an
1832                          * up-call has  been initiated to fill in the export
1833                          * options on exp.  When the answer comes back,
1834                          * this call will be retried.
1835                          */
1836                                 dput(dentry);
1837                                 exp_put(exp);
1838                                 nfserr = nfserr_dropit;
1839                                 goto error;
1840                         }
1841
1842                 }
1843
1844                 nfserr = nfsd4_encode_fattr(NULL, exp,
1845                                 dentry, p, &buflen, cd->rd_bmval,
1846                                 cd->rd_rqstp);
1847                 dput(dentry);
1848                 exp_put(exp);
1849                 if (!nfserr) {
1850                         p += buflen;
1851                         goto out;
1852                 }
1853                 if (nfserr == nfserr_resource)
1854                         goto nospc;
1855
1856 error:
1857                 /*
1858                  * If we get here, we experienced a miscellaneous
1859                  * failure while writing the attributes.  If the
1860                  * client requested the RDATTR_ERROR attribute,
1861                  * we stuff the error code into this attribute
1862                  * and continue.  If this attribute was not requested,
1863                  * then in accordance with the spec, we fail the
1864                  * entire READDIR operation(!)
1865                  */
1866                 if (!(bmval0 & FATTR4_WORD0_RDATTR_ERROR)) {
1867                         cd->common.err = nfserr;
1868                         return -EINVAL;
1869                 }
1870
1871                 bmval0 = FATTR4_WORD0_RDATTR_ERROR;
1872                 bmval1 = 0;
1873                 /* falling through here will do the right thing... */
1874         }
1875
1876         /*
1877          * In the common "lightweight" case, we avoid
1878          * the overhead of nfsd4_encode_fattr() by assembling
1879          * a small fattr by hand.
1880          */
1881         if (buflen < 6)
1882                 goto nospc;
1883         *p++ = htonl(2);
1884         *p++ = htonl(bmval0);
1885         *p++ = htonl(bmval1);
1886
1887         attrlenp = p++;
1888         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR)
1889                 *p++ = nfserr;       /* no htonl */
1890         if (bmval0 & FATTR4_WORD0_FILEID)
1891                 p = xdr_encode_hyper(p, (u64)ino);
1892         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1893
1894 out:
1895         cd->buflen -= (p - cd->buffer);
1896         cd->buffer = p;
1897         cd->common.err = nfs_ok;
1898         return 0;
1899
1900 nospc:
1901         cd->common.err = nfserr_toosmall;
1902         return -EINVAL;
1903 }
1904
1905 static void
1906 nfsd4_encode_access(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_access *access)
1907 {
1908         ENCODE_HEAD;
1909
1910         if (!nfserr) {
1911                 RESERVE_SPACE(8);
1912                 WRITE32(access->ac_supported);
1913                 WRITE32(access->ac_resp_access);
1914                 ADJUST_ARGS();
1915         }
1916 }
1917
1918 static void
1919 nfsd4_encode_close(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_close *close)
1920 {
1921         ENCODE_SEQID_OP_HEAD;
1922
1923         if (!nfserr) {
1924                 RESERVE_SPACE(sizeof(stateid_t));
1925                 WRITE32(close->cl_stateid.si_generation);
1926                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1927                 ADJUST_ARGS();
1928         }
1929         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1930 }
1931
1932
1933 static void
1934 nfsd4_encode_commit(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_commit *commit)
1935 {
1936         ENCODE_HEAD;
1937
1938         if (!nfserr) {
1939                 RESERVE_SPACE(8);
1940                 WRITEMEM(commit->co_verf.data, 8);
1941                 ADJUST_ARGS();
1942         }
1943 }
1944
1945 static void
1946 nfsd4_encode_create(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_create *create)
1947 {
1948         ENCODE_HEAD;
1949
1950         if (!nfserr) {
1951                 RESERVE_SPACE(32);
1952                 WRITECINFO(create->cr_cinfo);
1953                 WRITE32(2);
1954                 WRITE32(create->cr_bmval[0]);
1955                 WRITE32(create->cr_bmval[1]);
1956                 ADJUST_ARGS();
1957         }
1958 }
1959
1960 static int
1961 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_getattr *getattr)
1962 {
1963         struct svc_fh *fhp = getattr->ga_fhp;
1964         int buflen;
1965
1966         if (nfserr)
1967                 return nfserr;
1968
1969         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
1970         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
1971                                     resp->p, &buflen, getattr->ga_bmval,
1972                                     resp->rqstp);
1973
1974         if (!nfserr)
1975                 resp->p += buflen;
1976         return nfserr;
1977 }
1978
1979 static void
1980 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, int nfserr, struct svc_fh *fhp)
1981 {
1982         unsigned int len;
1983         ENCODE_HEAD;
1984
1985         if (!nfserr) {
1986                 len = fhp->fh_handle.fh_size;
1987                 RESERVE_SPACE(len + 4);
1988                 WRITE32(len);
1989                 WRITEMEM(&fhp->fh_handle.fh_base, len);
1990                 ADJUST_ARGS();
1991         }
1992 }
1993
1994 /*
1995 * Including all fields other than the name, a LOCK4denied structure requires
1996 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
1997 */
1998 static void
1999 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2000 {
2001         ENCODE_HEAD;
2002
2003         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop->so_owner.len));
2004         WRITE64(ld->ld_start);
2005         WRITE64(ld->ld_length);
2006         WRITE32(ld->ld_type);
2007         WRITEMEM(&ld->ld_sop->so_client->cl_clientid, 8);
2008         WRITE32(ld->ld_sop->so_owner.len);
2009         WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2010         ADJUST_ARGS();
2011 }
2012
2013 static void
2014 nfsd4_encode_lock(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lock *lock)
2015 {
2016
2017         ENCODE_SEQID_OP_HEAD;
2018
2019         if (!nfserr) {
2020                 RESERVE_SPACE(4 + sizeof(stateid_t));
2021                 WRITE32(lock->lk_resp_stateid.si_generation);
2022                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2023                 ADJUST_ARGS();
2024         } else if (nfserr == nfserr_denied)
2025                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2026
2027         ENCODE_SEQID_OP_TAIL(lock->lk_stateowner);
2028 }
2029
2030 static void
2031 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lockt *lockt)
2032 {
2033         if (nfserr == nfserr_denied)
2034                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2035 }
2036
2037 static void
2038 nfsd4_encode_locku(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_locku *locku)
2039 {
2040         ENCODE_SEQID_OP_HEAD;
2041
2042         if (!nfserr) {
2043                 RESERVE_SPACE(sizeof(stateid_t));
2044                 WRITE32(locku->lu_stateid.si_generation);
2045                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2046                 ADJUST_ARGS();
2047         }
2048
2049         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2050 }
2051
2052
2053 static void
2054 nfsd4_encode_link(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_link *link)
2055 {
2056         ENCODE_HEAD;
2057
2058         if (!nfserr) {
2059                 RESERVE_SPACE(20);
2060                 WRITECINFO(link->li_cinfo);
2061                 ADJUST_ARGS();
2062         }
2063 }
2064
2065
2066 static void
2067 nfsd4_encode_open(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open *open)
2068 {
2069         ENCODE_SEQID_OP_HEAD;
2070
2071         if (nfserr)
2072                 goto out;
2073
2074         RESERVE_SPACE(36 + sizeof(stateid_t));
2075         WRITE32(open->op_stateid.si_generation);
2076         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2077         WRITECINFO(open->op_cinfo);
2078         WRITE32(open->op_rflags);
2079         WRITE32(2);
2080         WRITE32(open->op_bmval[0]);
2081         WRITE32(open->op_bmval[1]);
2082         WRITE32(open->op_delegate_type);
2083         ADJUST_ARGS();
2084
2085         switch (open->op_delegate_type) {
2086         case NFS4_OPEN_DELEGATE_NONE:
2087                 break;
2088         case NFS4_OPEN_DELEGATE_READ:
2089                 RESERVE_SPACE(20 + sizeof(delegation_stateid_t));
2090                 WRITEMEM(&open->op_delegate_stateid, sizeof(delegation_stateid_t));
2091                 WRITE32(0);
2092
2093                 /*
2094                  * TODO: ACE's in delegations
2095                  */
2096                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2097                 WRITE32(0);
2098                 WRITE32(0);
2099                 WRITE32(0);   /* XXX: is NULL principal ok? */
2100                 ADJUST_ARGS();
2101                 break;
2102         case NFS4_OPEN_DELEGATE_WRITE:
2103                 RESERVE_SPACE(32 + sizeof(delegation_stateid_t));
2104                 WRITEMEM(&open->op_delegate_stateid, sizeof(delegation_stateid_t));
2105                 WRITE32(0);
2106
2107                 /*
2108                  * TODO: space_limit's in delegations
2109                  */
2110                 WRITE32(NFS4_LIMIT_SIZE);
2111                 WRITE32(~(u32)0);
2112                 WRITE32(~(u32)0);
2113
2114                 /*
2115                  * TODO: ACE's in delegations
2116                  */
2117                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2118                 WRITE32(0);
2119                 WRITE32(0);
2120                 WRITE32(0);   /* XXX: is NULL principal ok? */
2121                 ADJUST_ARGS();
2122                 break;
2123         default:
2124                 BUG();
2125         }
2126         /* XXX save filehandle here */
2127 out:
2128         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2129 }
2130
2131 static void
2132 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_confirm *oc)
2133 {
2134         ENCODE_SEQID_OP_HEAD;
2135
2136         if (!nfserr) {
2137                 RESERVE_SPACE(sizeof(stateid_t));
2138                 WRITE32(oc->oc_resp_stateid.si_generation);
2139                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2140                 ADJUST_ARGS();
2141         }
2142
2143         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2144 }
2145
2146 static void
2147 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_downgrade *od)
2148 {
2149         ENCODE_SEQID_OP_HEAD;
2150
2151         if (!nfserr) {
2152                 RESERVE_SPACE(sizeof(stateid_t));
2153                 WRITE32(od->od_stateid.si_generation);
2154                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2155                 ADJUST_ARGS();
2156         }
2157
2158         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2159 }
2160
2161 static int
2162 nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_read *read)
2163 {
2164         u32 eof;
2165         int v, pn;
2166         unsigned long maxcount;
2167         long len;
2168         ENCODE_HEAD;
2169
2170         if (nfserr)
2171                 return nfserr;
2172         if (resp->xbuf->page_len)
2173                 return nfserr_resource;
2174
2175         RESERVE_SPACE(8); /* eof flag and byte count */
2176
2177         maxcount = NFSSVC_MAXBLKSIZE;
2178         if (maxcount > read->rd_length)
2179                 maxcount = read->rd_length;
2180
2181         len = maxcount;
2182         v = 0;
2183         while (len > 0) {
2184                 pn = resp->rqstp->rq_resused;
2185                 svc_take_page(resp->rqstp);
2186                 read->rd_iov[v].iov_base = page_address(resp->rqstp->rq_respages[pn]);
2187                 read->rd_iov[v].iov_len = len < PAGE_SIZE ? len : PAGE_SIZE;
2188                 v++;
2189                 len -= PAGE_SIZE;
2190         }
2191         read->rd_vlen = v;
2192
2193         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp,
2194                            read->rd_offset,
2195                            read->rd_iov, read->rd_vlen,
2196                            &maxcount);
2197         if (nfserr == nfserr_symlink)
2198                 nfserr = nfserr_inval;
2199         if (nfserr)
2200                 return nfserr;
2201         eof = (read->rd_offset + maxcount >= read->rd_fhp->fh_dentry->d_inode->i_size);
2202
2203         WRITE32(eof);
2204         WRITE32(maxcount);
2205         ADJUST_ARGS();
2206         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2207
2208         resp->xbuf->page_len = maxcount;
2209
2210         /* read zero bytes -> don't set up tail */
2211         if(!maxcount)
2212                 return 0;
2213
2214         /* set up page for remaining responses */
2215         svc_take_page(resp->rqstp);
2216         resp->xbuf->tail[0].iov_base =
2217                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2218         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2219         resp->xbuf->tail[0].iov_len = 0;
2220         resp->p = resp->xbuf->tail[0].iov_base;
2221         resp->end = resp->p + PAGE_SIZE/4;
2222
2223         if (maxcount&3) {
2224                 *(resp->p)++ = 0;
2225                 resp->xbuf->tail[0].iov_base += maxcount&3;
2226                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2227         }
2228         return 0;
2229 }
2230
2231 static int
2232 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readlink *readlink)
2233 {
2234         int maxcount;
2235         char *page;
2236         ENCODE_HEAD;
2237
2238         if (nfserr)
2239                 return nfserr;
2240         if (resp->xbuf->page_len)
2241                 return nfserr_resource;
2242
2243         svc_take_page(resp->rqstp);
2244         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2245
2246         maxcount = PAGE_SIZE;
2247         RESERVE_SPACE(4);
2248
2249         /*
2250          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2251          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2252          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2253          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2254          */
2255         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2256         if (nfserr == nfserr_isdir)
2257                 return nfserr_inval;
2258         if (nfserr)
2259                 return nfserr;
2260
2261         WRITE32(maxcount);
2262         ADJUST_ARGS();
2263         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2264
2265         svc_take_page(resp->rqstp);
2266         resp->xbuf->tail[0].iov_base =
2267                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2268         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2269         resp->xbuf->tail[0].iov_len = 0;
2270         resp->p = resp->xbuf->tail[0].iov_base;
2271         resp->end = resp->p + PAGE_SIZE/4;
2272
2273         resp->xbuf->page_len = maxcount;
2274         if (maxcount&3) {
2275                 *(resp->p)++ = 0;
2276                 resp->xbuf->tail[0].iov_base += maxcount&3;
2277                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2278         }
2279         return 0;
2280 }
2281
2282 static int
2283 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readdir *readdir)
2284 {
2285         int maxcount;
2286         loff_t offset;
2287         u32 *page, *savep;
2288         ENCODE_HEAD;
2289
2290         if (nfserr)
2291                 return nfserr;
2292         if (resp->xbuf->page_len)
2293                 return nfserr_resource;
2294
2295         RESERVE_SPACE(8);  /* verifier */
2296         savep = p;
2297
2298         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2299         WRITE32(0);
2300         WRITE32(0);
2301         ADJUST_ARGS();
2302         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2303
2304         maxcount = PAGE_SIZE;
2305         if (maxcount > readdir->rd_maxcount)
2306                 maxcount = readdir->rd_maxcount;
2307
2308         /*
2309          * Convert from bytes to words, account for the two words already
2310          * written, make sure to leave two words at the end for the next
2311          * pointer and eof field.
2312          */
2313         maxcount = (maxcount >> 2) - 4;
2314         if (maxcount < 0) {
2315                 nfserr =  nfserr_toosmall;
2316                 goto err_no_verf;
2317         }
2318
2319         svc_take_page(resp->rqstp);
2320         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2321         readdir->common.err = 0;
2322         readdir->buflen = maxcount;
2323         readdir->buffer = page;
2324         readdir->offset = NULL;
2325
2326         offset = readdir->rd_cookie;
2327         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2328                               &offset,
2329                               &readdir->common, nfsd4_encode_dirent);
2330         if (nfserr == nfs_ok &&
2331             readdir->common.err == nfserr_toosmall &&
2332             readdir->buffer == page)
2333                 nfserr = nfserr_toosmall;
2334         if (nfserr == nfserr_symlink)
2335                 nfserr = nfserr_notdir;
2336         if (nfserr)
2337                 goto err_no_verf;
2338
2339         if (readdir->offset)
2340                 xdr_encode_hyper(readdir->offset, offset);
2341
2342         p = readdir->buffer;
2343         *p++ = 0;       /* no more entries */
2344         *p++ = htonl(readdir->common.err == nfserr_eof);
2345         resp->xbuf->page_len = ((char*)p) - (char*)page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2346
2347         /* allocate a page for the tail */
2348         svc_take_page(resp->rqstp);
2349         resp->xbuf->tail[0].iov_base =
2350                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2351         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2352         resp->xbuf->tail[0].iov_len = 0;
2353         resp->p = resp->xbuf->tail[0].iov_base;
2354         resp->end = resp->p + PAGE_SIZE/4;
2355
2356         return 0;
2357 err_no_verf:
2358         p = savep;
2359         ADJUST_ARGS();
2360         return nfserr;
2361 }
2362
2363 static void
2364 nfsd4_encode_remove(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_remove *remove)
2365 {
2366         ENCODE_HEAD;
2367
2368         if (!nfserr) {
2369                 RESERVE_SPACE(20);
2370                 WRITECINFO(remove->rm_cinfo);
2371                 ADJUST_ARGS();
2372         }
2373 }
2374
2375 static void
2376 nfsd4_encode_rename(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_rename *rename)
2377 {
2378         ENCODE_HEAD;
2379
2380         if (!nfserr) {
2381                 RESERVE_SPACE(40);
2382                 WRITECINFO(rename->rn_sinfo);
2383                 WRITECINFO(rename->rn_tinfo);
2384                 ADJUST_ARGS();
2385         }
2386 }
2387
2388 /*
2389  * The SETATTR encode routine is special -- it always encodes a bitmap,
2390  * regardless of the error status.
2391  */
2392 static void
2393 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setattr *setattr)
2394 {
2395         ENCODE_HEAD;
2396
2397         RESERVE_SPACE(12);
2398         if (nfserr) {
2399                 WRITE32(2);
2400                 WRITE32(0);
2401                 WRITE32(0);
2402         }
2403         else {
2404                 WRITE32(2);
2405                 WRITE32(setattr->sa_bmval[0]);
2406                 WRITE32(setattr->sa_bmval[1]);
2407         }
2408         ADJUST_ARGS();
2409 }
2410
2411 static void
2412 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setclientid *scd)
2413 {
2414         ENCODE_HEAD;
2415
2416         if (!nfserr) {
2417                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2418                 WRITEMEM(&scd->se_clientid, 8);
2419                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2420                 ADJUST_ARGS();
2421         }
2422         else if (nfserr == nfserr_clid_inuse) {
2423                 RESERVE_SPACE(8);
2424                 WRITE32(0);
2425                 WRITE32(0);
2426                 ADJUST_ARGS();
2427         }
2428 }
2429
2430 static void
2431 nfsd4_encode_write(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_write *write)
2432 {
2433         ENCODE_HEAD;
2434
2435         if (!nfserr) {
2436                 RESERVE_SPACE(16);
2437                 WRITE32(write->wr_bytes_written);
2438                 WRITE32(write->wr_how_written);
2439                 WRITEMEM(write->wr_verifier.data, 8);
2440                 ADJUST_ARGS();
2441         }
2442 }
2443
2444 void
2445 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2446 {
2447         u32 *statp;
2448         ENCODE_HEAD;
2449
2450         RESERVE_SPACE(8);
2451         WRITE32(op->opnum);
2452         statp = p++;    /* to be backfilled at the end */
2453         ADJUST_ARGS();
2454
2455         switch (op->opnum) {
2456         case OP_ACCESS:
2457                 nfsd4_encode_access(resp, op->status, &op->u.access);
2458                 break;
2459         case OP_CLOSE:
2460                 nfsd4_encode_close(resp, op->status, &op->u.close);
2461                 break;
2462         case OP_COMMIT:
2463                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2464                 break;
2465         case OP_CREATE:
2466                 nfsd4_encode_create(resp, op->status, &op->u.create);
2467                 break;
2468         case OP_GETATTR:
2469                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2470                 break;
2471         case OP_GETFH:
2472                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2473                 break;
2474         case OP_LINK:
2475                 nfsd4_encode_link(resp, op->status, &op->u.link);
2476                 break;
2477         case OP_LOCK:
2478                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2479                 break;
2480         case OP_LOCKT:
2481                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2482                 break;
2483         case OP_LOCKU:
2484                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2485                 break;
2486         case OP_LOOKUP:
2487                 break;
2488         case OP_LOOKUPP:
2489                 break;
2490         case OP_NVERIFY:
2491                 break;
2492         case OP_OPEN:
2493                 nfsd4_encode_open(resp, op->status, &op->u.open);
2494                 break;
2495         case OP_OPEN_CONFIRM:
2496                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2497                 break;
2498         case OP_OPEN_DOWNGRADE:
2499                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2500                 break;
2501         case OP_PUTFH:
2502                 break;
2503         case OP_PUTROOTFH:
2504                 break;
2505         case OP_READ:
2506                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2507                 break;
2508         case OP_READDIR:
2509                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2510                 break;
2511         case OP_READLINK:
2512                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2513                 break;
2514         case OP_REMOVE:
2515                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2516                 break;
2517         case OP_RENAME:
2518                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2519                 break;
2520         case OP_RENEW:
2521                 break;
2522         case OP_RESTOREFH:
2523                 break;
2524         case OP_SAVEFH:
2525                 break;
2526         case OP_SETATTR:
2527                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2528                 break;
2529         case OP_SETCLIENTID:
2530                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2531                 break;
2532         case OP_SETCLIENTID_CONFIRM:
2533                 break;
2534         case OP_VERIFY:
2535                 break;
2536         case OP_WRITE:
2537                 nfsd4_encode_write(resp, op->status, &op->u.write);
2538                 break;
2539         case OP_RELEASE_LOCKOWNER:
2540                 break;
2541         default:
2542                 break;
2543         }
2544
2545         /*
2546          * Note: We write the status directly, instead of using WRITE32(),
2547          * since it is already in network byte order.
2548          */
2549         *statp = op->status;
2550 }
2551
2552 /*
2553  * Encode the reply stored in the stateowner reply cache
2554  *
2555  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2556  * previously sent already encoded operation.
2557  *
2558  * called with nfs4_lock_state() held
2559  */
2560 void
2561 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2562 {
2563         ENCODE_HEAD;
2564         struct nfs4_replay *rp = op->replay;
2565
2566         BUG_ON(!rp);
2567
2568         RESERVE_SPACE(8);
2569         WRITE32(op->opnum);
2570         *p++ = rp->rp_status;  /* already xdr'ed */
2571         ADJUST_ARGS();
2572
2573         RESERVE_SPACE(rp->rp_buflen);
2574         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2575         ADJUST_ARGS();
2576         nfs4_unlock_state();
2577 }
2578
2579 /*
2580  * END OF "GENERIC" ENCODE ROUTINES.
2581  */
2582
2583 int
2584 nfs4svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
2585 {
2586         return xdr_ressize_check(rqstp, p);
2587 }
2588
2589 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2590 {
2591         if (args->ops != args->iops) {
2592                 kfree(args->ops);
2593                 args->ops = args->iops;
2594         }
2595         if (args->tmpp) {
2596                 kfree(args->tmpp);
2597                 args->tmpp = NULL;
2598         }
2599         while (args->to_free) {
2600                 struct tmpbuf *tb = args->to_free;
2601                 args->to_free = tb->next;
2602                 tb->release(tb->buf);
2603                 kfree(tb);
2604         }
2605 }
2606
2607 int
2608 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundargs *args)
2609 {
2610         int status;
2611
2612         args->p = p;
2613         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2614         args->pagelist = rqstp->rq_arg.pages;
2615         args->pagelen = rqstp->rq_arg.page_len;
2616         args->tmpp = NULL;
2617         args->to_free = NULL;
2618         args->ops = args->iops;
2619         args->rqstp = rqstp;
2620
2621         status = nfsd4_decode_compound(args);
2622         if (status) {
2623                 nfsd4_release_compoundargs(args);
2624         }
2625         return !status;
2626 }
2627
2628 int
2629 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundres *resp)
2630 {
2631         /*
2632          * All that remains is to write the tag and operation count...
2633          */
2634         struct kvec *iov;
2635         p = resp->tagp;
2636         *p++ = htonl(resp->taglen);
2637         memcpy(p, resp->tag, resp->taglen);
2638         p += XDR_QUADLEN(resp->taglen);
2639         *p++ = htonl(resp->opcnt);
2640
2641         if (rqstp->rq_res.page_len)
2642                 iov = &rqstp->rq_res.tail[0];
2643         else
2644                 iov = &rqstp->rq_res.head[0];
2645         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2646         BUG_ON(iov->iov_len > PAGE_SIZE);
2647         return 1;
2648 }
2649
2650 /*
2651  * Local variables:
2652  *  c-basic-offset: 8
2653  * End:
2654  */