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 static int
 550 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 551 {
 552         DECODE_HEAD;
 553
 554         close->cl_stateowner = NULL;
 555         READ_BUF(4 + sizeof(stateid_t));
 556         READ32(close->cl_seqid);
 557         READ32(close->cl_stateid.si_generation);
 558         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
 559
 560         DECODE_TAIL;
 561 }
 562
 563
 564 static int
 565 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 566 {
 567         DECODE_HEAD;
 568
 569         READ_BUF(12);
 570         READ64(commit->co_offset);
 571         READ32(commit->co_count);
 572
 573         DECODE_TAIL;
 574 }
 575
 576 static int
 577 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 578 {
 579         DECODE_HEAD;
 580
 581         READ_BUF(4);
 582         READ32(create->cr_type);
 583         switch (create->cr_type) {
 584         case NF4LNK:
 585                 READ_BUF(4);
 586                 READ32(create->cr_linklen);
 587                 READ_BUF(create->cr_linklen);
 588                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 589                 if (check_utf8(create->cr_linkname, create->cr_linklen))
 590                         return nfserr_inval;
 591                 break;
 592         case NF4BLK:
 593         case NF4CHR:
 594                 READ_BUF(8);
 595                 READ32(create->cr_specdata1);
 596                 READ32(create->cr_specdata2);
 597                 break;
 598         case NF4SOCK:
 599         case NF4FIFO:
 600         case NF4DIR:
 601         default:
 602                 break;
 603         }
 604
 605         READ_BUF(4);
 606         READ32(create->cr_namelen);
 607         READ_BUF(create->cr_namelen);
 608         SAVEMEM(create->cr_name, create->cr_namelen);
 609         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 610                 return status;
 611
 612         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
 613                 goto out;
 614
 615         DECODE_TAIL;
 616 }
 617
 618 static inline int
 619 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 620 {
 621         DECODE_HEAD;
 622
 623         READ_BUF(sizeof(stateid_t));
 624         READ32(dr->dr_stateid.si_generation);
 625         COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
 626
 627         DECODE_TAIL;
 628 }
 629
 630 static inline int
 631 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 632 {
 633         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 634 }
 635
 636 static int
 637 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 638 {
 639         DECODE_HEAD;
 640
 641         READ_BUF(4);
 642         READ32(link->li_namelen);
 643         READ_BUF(link->li_namelen);
 644         SAVEMEM(link->li_name, link->li_namelen);
 645         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 646                 return status;
 647
 648         DECODE_TAIL;
 649 }
 650
 651 static int
 652 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 653 {
 654         DECODE_HEAD;
 655
 656         lock->lk_stateowner = NULL;
 657         /*
 658         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 659         */
 660         READ_BUF(28);
 661         READ32(lock->lk_type);
 662         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 663                 goto xdr_error;
 664         READ32(lock->lk_reclaim);
 665         READ64(lock->lk_offset);
 666         READ64(lock->lk_length);
 667         READ32(lock->lk_is_new);
 668
 669         if (lock->lk_is_new) {
 670                 READ_BUF(36);
 671                 READ32(lock->lk_new_open_seqid);
 672                 READ32(lock->lk_new_open_stateid.si_generation);
 673
 674                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
 675                 READ32(lock->lk_new_lock_seqid);
 676                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 677                 READ32(lock->lk_new_owner.len);
 678                 READ_BUF(lock->lk_new_owner.len);
 679                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 680         } else {
 681                 READ_BUF(20);
 682                 READ32(lock->lk_old_lock_stateid.si_generation);
 683                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
 684                 READ32(lock->lk_old_lock_seqid);
 685         }
 686
 687         DECODE_TAIL;
 688 }
 689
 690 static int
 691 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 692 {
 693         DECODE_HEAD;
 694
 695         READ_BUF(32);
 696         READ32(lockt->lt_type);
 697         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 698                 goto xdr_error;
 699         READ64(lockt->lt_offset);
 700         READ64(lockt->lt_length);
 701         COPYMEM(&lockt->lt_clientid, 8);
 702         READ32(lockt->lt_owner.len);
 703         READ_BUF(lockt->lt_owner.len);
 704         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 705
 706         DECODE_TAIL;
 707 }
 708
 709 static int
 710 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 711 {
 712         DECODE_HEAD;
 713
 714         locku->lu_stateowner = NULL;
 715         READ_BUF(24 + sizeof(stateid_t));
 716         READ32(locku->lu_type);
 717         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 718                 goto xdr_error;
 719         READ32(locku->lu_seqid);
 720         READ32(locku->lu_stateid.si_generation);
 721         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
 722         READ64(locku->lu_offset);
 723         READ64(locku->lu_length);
 724
 725         DECODE_TAIL;
 726 }
 727
 728 static int
 729 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 730 {
 731         DECODE_HEAD;
 732
 733         READ_BUF(4);
 734         READ32(lookup->lo_len);
 735         READ_BUF(lookup->lo_len);
 736         SAVEMEM(lookup->lo_name, lookup->lo_len);
 737         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 738                 return status;
 739
 740         DECODE_TAIL;
 741 }
 742
 743 static int
 744 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 745 {
 746         DECODE_HEAD;
 747
 748         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 749         open->op_iattr.ia_valid = 0;
 750         open->op_stateowner = NULL;
 751
 752         /* seqid, share_access, share_deny, clientid, ownerlen */
 753         READ_BUF(16 + sizeof(clientid_t));
 754         READ32(open->op_seqid);
 755         READ32(open->op_share_access);
 756         READ32(open->op_share_deny);
 757         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 758         READ32(open->op_owner.len);
 759
 760         /* owner, open_flag */
 761         READ_BUF(open->op_owner.len + 4);
 762         SAVEMEM(open->op_owner.data, open->op_owner.len);
 763         READ32(open->op_create);
 764         switch (open->op_create) {
 765         case NFS4_OPEN_NOCREATE:
 766                 break;
 767         case NFS4_OPEN_CREATE:
 768                 READ_BUF(4);
 769                 READ32(open->op_createmode);
 770                 switch (open->op_createmode) {
 771                 case NFS4_CREATE_UNCHECKED:
 772                 case NFS4_CREATE_GUARDED:
 773                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
 774                                 goto out;
 775                         break;
 776                 case NFS4_CREATE_EXCLUSIVE:
 777                         READ_BUF(8);
 778                         COPYMEM(open->op_verf.data, 8);
 779                         break;
 780                 default:
 781                         goto xdr_error;
 782                 }
 783                 break;
 784         default:
 785                 goto xdr_error;
 786         }
 787
 788         /* open_claim */
 789         READ_BUF(4);
 790         READ32(open->op_claim_type);
 791         switch (open->op_claim_type) {
 792         case NFS4_OPEN_CLAIM_NULL:
 793         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 794                 READ_BUF(4);
 795                 READ32(open->op_fname.len);
 796                 READ_BUF(open->op_fname.len);
 797                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 798                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 799                         return status;
 800                 break;
 801         case NFS4_OPEN_CLAIM_PREVIOUS:
 802                 READ_BUF(4);
 803                 READ32(open->op_delegate_type);
 804                 break;
 805         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 806                 READ_BUF(sizeof(stateid_t) + 4);
 807                 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
 808                 READ32(open->op_fname.len);
 809                 READ_BUF(open->op_fname.len);
 810                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 811                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 812                         return status;
 813                 break;
 814         default:
 815                 goto xdr_error;
 816         }
 817
 818         DECODE_TAIL;
 819 }
 820
 821 static int
 822 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 823 {
 824         DECODE_HEAD;
 825
 826         open_conf->oc_stateowner = NULL;
 827         READ_BUF(4 + sizeof(stateid_t));
 828         READ32(open_conf->oc_req_stateid.si_generation);
 829         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
 830         READ32(open_conf->oc_seqid);
 831
 832         DECODE_TAIL;
 833 }
 834
 835 static int
 836 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 837 {
 838         DECODE_HEAD;
 839
 840         open_down->od_stateowner = NULL;
 841         READ_BUF(12 + sizeof(stateid_t));
 842         READ32(open_down->od_stateid.si_generation);
 843         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
 844         READ32(open_down->od_seqid);
 845         READ32(open_down->od_share_access);
 846         READ32(open_down->od_share_deny);
 847
 848         DECODE_TAIL;
 849 }
 850
 851 static int
 852 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 853 {
 854         DECODE_HEAD;
 855
 856         READ_BUF(4);
 857         READ32(putfh->pf_fhlen);
 858         if (putfh->pf_fhlen > NFS4_FHSIZE)
 859                 goto xdr_error;
 860         READ_BUF(putfh->pf_fhlen);
 861         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 862
 863         DECODE_TAIL;
 864 }
 865
 866 static int
 867 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 868 {
 869         DECODE_HEAD;
 870
 871         READ_BUF(sizeof(stateid_t) + 12);
 872         READ32(read->rd_stateid.si_generation);
 873         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
 874         READ64(read->rd_offset);
 875         READ32(read->rd_length);
 876
 877         DECODE_TAIL;
 878 }
 879
 880 static int
 881 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 882 {
 883         DECODE_HEAD;
 884
 885         READ_BUF(24);
 886         READ64(readdir->rd_cookie);
 887         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 888         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 889         READ32(readdir->rd_maxcount);
 890         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 891                 goto out;
 892
 893         DECODE_TAIL;
 894 }
 895
 896 static int
 897 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 898 {
 899         DECODE_HEAD;
 900
 901         READ_BUF(4);
 902         READ32(remove->rm_namelen);
 903         READ_BUF(remove->rm_namelen);
 904         SAVEMEM(remove->rm_name, remove->rm_namelen);
 905         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 906                 return status;
 907
 908         DECODE_TAIL;
 909 }
 910
 911 static int
 912 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 913 {
 914         DECODE_HEAD;
 915
 916         READ_BUF(4);
 917         READ32(rename->rn_snamelen);
 918         READ_BUF(rename->rn_snamelen + 4);
 919         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 920         READ32(rename->rn_tnamelen);
 921         READ_BUF(rename->rn_tnamelen);
 922         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 923         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 924                 return status;
 925         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 926                 return status;
 927
 928         DECODE_TAIL;
 929 }
 930
 931 static int
 932 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 933 {
 934         DECODE_HEAD;
 935
 936         READ_BUF(sizeof(clientid_t));
 937         COPYMEM(clientid, sizeof(clientid_t));
 938
 939         DECODE_TAIL;
 940 }
 941
 942 static int
 943 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 944 {
 945         DECODE_HEAD;
 946
 947         READ_BUF(sizeof(stateid_t));
 948         READ32(setattr->sa_stateid.si_generation);
 949         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
 950         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
 951                 goto out;
 952
 953         DECODE_TAIL;
 954 }
 955
 956 static int
 957 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 958 {
 959         DECODE_HEAD;
 960
 961         READ_BUF(12);
 962         COPYMEM(setclientid->se_verf.data, 8);
 963         READ32(setclientid->se_namelen);
 964
 965         READ_BUF(setclientid->se_namelen + 8);
 966         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 967         READ32(setclientid->se_callback_prog);
 968         READ32(setclientid->se_callback_netid_len);
 969
 970         READ_BUF(setclientid->se_callback_netid_len + 4);
 971         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 972         READ32(setclientid->se_callback_addr_len);
 973
 974         READ_BUF(setclientid->se_callback_addr_len + 4);
 975         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 976         READ32(setclientid->se_callback_ident);
 977
 978         DECODE_TAIL;
 979 }
 980
 981 static int
 982 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 983 {
 984         DECODE_HEAD;
 985
 986         READ_BUF(8 + sizeof(nfs4_verifier));
 987         COPYMEM(&scd_c->sc_clientid, 8);
 988         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 989
 990         DECODE_TAIL;
 991 }
 992
 993 /* Also used for NVERIFY */
 994 static int
 995 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 996 {
 997 #if 0
 998         struct nfsd4_compoundargs save = {
 999                 .p = argp->p,
1000                 .end = argp->end,
1001                 .rqstp = argp->rqstp,
1002         };
1003         u32             ve_bmval[2];
1004         struct iattr    ve_iattr;           /* request */
1005         struct nfs4_acl *ve_acl;            /* request */
1006 #endif
1007         DECODE_HEAD;
1008
1009         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1010                 goto out;
1011
1012         /* For convenience's sake, we compare raw xdr'd attributes in
1013          * nfsd4_proc_verify; however we still decode here just to return
1014          * correct error in case of bad xdr. */
1015 #if 0
1016         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
1017         if (status == nfserr_inval) {
1018                 status = nfserrno(status);
1019                 goto out;
1020         }
1021 #endif
1022         READ_BUF(4);
1023         READ32(verify->ve_attrlen);
1024         READ_BUF(verify->ve_attrlen);
1025         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1026
1027         DECODE_TAIL;
1028 }
1029
1030 static int
1031 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1032 {
1033         int avail;
1034         int v;
1035         int len;
1036         DECODE_HEAD;
1037
1038         READ_BUF(sizeof(stateid_opaque_t) + 20);
1039         READ32(write->wr_stateid.si_generation);
1040         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
1041         READ64(write->wr_offset);
1042         READ32(write->wr_stable_how);
1043         if (write->wr_stable_how > 2)
1044                 goto xdr_error;
1045         READ32(write->wr_buflen);
1046
1047         /* Sorry .. no magic macros for this.. *
1048          * READ_BUF(write->wr_buflen);
1049          * SAVEMEM(write->wr_buf, write->wr_buflen);
1050          */
1051         avail = (char*)argp->end - (char*)argp->p;
1052         if (avail + argp->pagelen < write->wr_buflen) {
1053                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__);
1054                 goto xdr_error;
1055         }
1056         write->wr_vec[0].iov_base = p;
1057         write->wr_vec[0].iov_len = avail;
1058         v = 0;
1059         len = write->wr_buflen;
1060         while (len > write->wr_vec[v].iov_len) {
1061                 len -= write->wr_vec[v].iov_len;
1062                 v++;
1063                 write->wr_vec[v].iov_base = page_address(argp->pagelist[0]);
1064                 argp->pagelist++;
1065                 if (argp->pagelen >= PAGE_SIZE) {
1066                         write->wr_vec[v].iov_len = PAGE_SIZE;
1067                         argp->pagelen -= PAGE_SIZE;
1068                 } else {
1069                         write->wr_vec[v].iov_len = argp->pagelen;
1070                         argp->pagelen -= len;
1071                 }
1072         }
1073         argp->end = (u32*) (write->wr_vec[v].iov_base + write->wr_vec[v].iov_len);
1074         argp->p = (u32*)  (write->wr_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1075         write->wr_vec[v].iov_len = len;
1076         write->wr_vlen = v+1;
1077
1078         DECODE_TAIL;
1079 }
1080
1081 static int
1082 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1083 {
1084         DECODE_HEAD;
1085
1086         READ_BUF(12);
1087         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1088         READ32(rlockowner->rl_owner.len);
1089         READ_BUF(rlockowner->rl_owner.len);
1090         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1091
1092         DECODE_TAIL;
1093 }
1094
1095 static int
1096 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1097 {
1098         DECODE_HEAD;
1099         struct nfsd4_op *op;
1100         int i;
1101
1102         /*
1103          * XXX: According to spec, we should check the tag
1104          * for UTF-8 compliance.  I'm postponing this for
1105          * now because it seems that some clients do use
1106          * binary tags.
1107          */
1108         READ_BUF(4);
1109         READ32(argp->taglen);
1110         READ_BUF(argp->taglen + 8);
1111         SAVEMEM(argp->tag, argp->taglen);
1112         READ32(argp->minorversion);
1113         READ32(argp->opcnt);
1114
1115         if (argp->taglen > NFSD4_MAX_TAGLEN)
1116                 goto xdr_error;
1117         if (argp->opcnt > 100)
1118                 goto xdr_error;
1119
1120         if (argp->opcnt > sizeof(argp->iops)/sizeof(argp->iops[0])) {
1121                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1122                 if (!argp->ops) {
1123                         argp->ops = argp->iops;
1124                         printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
1125                         goto xdr_error;
1126                 }
1127         }
1128
1129         for (i = 0; i < argp->opcnt; i++) {
1130                 op = &argp->ops[i];
1131                 op->replay = NULL;
1132
1133                 /*
1134                  * We can't use READ_BUF() here because we need to handle
1135                  * a missing opcode as an OP_WRITE + 1. So we need to check
1136                  * to see if we're truly at the end of our buffer or if there
1137                  * is another page we need to flip to.
1138                  */
1139
1140                 if (argp->p == argp->end) {
1141                         if (argp->pagelen < 4) {
1142                                 /* There isn't an opcode still on the wire */
1143                                 op->opnum = OP_WRITE + 1;
1144                                 op->status = nfserr_bad_xdr;
1145                                 argp->opcnt = i+1;
1146                                 break;
1147                         }
1148
1149                         /*
1150                          * False alarm. We just hit a page boundary, but there
1151                          * is still data available.  Move pointer across page
1152                          * boundary.  *snip from READ_BUF*
1153                          */
1154                         argp->p = page_address(argp->pagelist[0]);
1155                         argp->pagelist++;
1156                         if (argp->pagelen < PAGE_SIZE) {
1157                                 argp->end = p + (argp->pagelen>>2);
1158                                 argp->pagelen = 0;
1159                         } else {
1160                                 argp->end = p + (PAGE_SIZE>>2);
1161                                 argp->pagelen -= PAGE_SIZE;
1162                         }
1163                 }
1164                 op->opnum = ntohl(*argp->p++);
1165
1166                 switch (op->opnum) {
1167                 case 2: /* Reserved operation */
1168                         op->opnum = OP_ILLEGAL;
1169                         if (argp->minorversion == 0)
1170                                 op->status = nfserr_op_illegal;
1171                         else
1172                                 op->status = nfserr_minor_vers_mismatch;
1173                         break;
1174                 case OP_ACCESS:
1175                         op->status = nfsd4_decode_access(argp, &op->u.access);
1176                         break;
1177                 case OP_CLOSE:
1178                         op->status = nfsd4_decode_close(argp, &op->u.close);
1179                         break;
1180                 case OP_COMMIT:
1181                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1182                         break;
1183                 case OP_CREATE:
1184                         op->status = nfsd4_decode_create(argp, &op->u.create);
1185                         break;
1186                 case OP_DELEGRETURN:
1187                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1188                         break;
1189                 case OP_GETATTR:
1190                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1191                         break;
1192                 case OP_GETFH:
1193                         op->status = nfs_ok;
1194                         break;
1195                 case OP_LINK:
1196                         op->status = nfsd4_decode_link(argp, &op->u.link);
1197                         break;
1198                 case OP_LOCK:
1199                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1200                         break;
1201                 case OP_LOCKT:
1202                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1203                         break;
1204                 case OP_LOCKU:
1205                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1206                         break;
1207                 case OP_LOOKUP:
1208                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1209                         break;
1210                 case OP_LOOKUPP:
1211                         op->status = nfs_ok;
1212                         break;
1213                 case OP_NVERIFY:
1214                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1215                         break;
1216                 case OP_OPEN:
1217                         op->status = nfsd4_decode_open(argp, &op->u.open);
1218                         break;
1219                 case OP_OPEN_CONFIRM:
1220                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1221                         break;
1222                 case OP_OPEN_DOWNGRADE:
1223                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1224                         break;
1225                 case OP_PUTFH:
1226                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1227                         break;
1228                 case OP_PUTROOTFH:
1229                         op->status = nfs_ok;
1230                         break;
1231                 case OP_READ:
1232                         op->status = nfsd4_decode_read(argp, &op->u.read);
1233                         break;
1234                 case OP_READDIR:
1235                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1236                         break;
1237                 case OP_READLINK:
1238                         op->status = nfs_ok;
1239                         break;
1240                 case OP_REMOVE:
1241                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1242                         break;
1243                 case OP_RENAME:
1244                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1245                         break;
1246                 case OP_RESTOREFH:
1247                         op->status = nfs_ok;
1248                         break;
1249                 case OP_RENEW:
1250                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1251                         break;
1252                 case OP_SAVEFH:
1253                         op->status = nfs_ok;
1254                         break;
1255                 case OP_SETATTR:
1256                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1257                         break;
1258                 case OP_SETCLIENTID:
1259                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1260                         break;
1261                 case OP_SETCLIENTID_CONFIRM:
1262                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1263                         break;
1264                 case OP_VERIFY:
1265                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1266                         break;
1267                 case OP_WRITE:
1268                         op->status = nfsd4_decode_write(argp, &op->u.write);
1269                         break;
1270                 case OP_RELEASE_LOCKOWNER:
1271                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1272                         break;
1273                 default:
1274                         op->opnum = OP_ILLEGAL;
1275                         op->status = nfserr_op_illegal;
1276                         break;
1277                 }
1278
1279                 if (op->status) {
1280                         argp->opcnt = i+1;
1281                         break;
1282                 }
1283         }
1284
1285         DECODE_TAIL;
1286 }
1287 /*
1288  * END OF "GENERIC" DECODE ROUTINES.
1289  */
1290
1291 /*
1292  * START OF "GENERIC" ENCODE ROUTINES.
1293  *   These may look a little ugly since they are imported from a "generic"
1294  * set of XDR encode/decode routines which are intended to be shared by
1295  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1296  *
1297  * If the pain of reading these is too great, it should be a straightforward
1298  * task to translate them into Linux-specific versions which are more
1299  * consistent with the style used in NFSv2/v3...
1300  */
1301 #define ENCODE_HEAD              u32 *p
1302
1303 #define WRITE32(n)               *p++ = htonl(n)
1304 #define WRITE64(n)               do {                           \
1305         *p++ = htonl((u32)((n) >> 32));                         \
1306         *p++ = htonl((u32)(n));                                 \
1307 } while (0)
1308 #define WRITEMEM(ptr,nbytes)     do {                           \
1309         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1310         memcpy(p, ptr, nbytes);                                 \
1311         p += XDR_QUADLEN(nbytes);                               \
1312 } while (0)
1313 #define WRITECINFO(c)           do {                            \
1314         *p++ = htonl(c.atomic);                                 \
1315         *p++ = htonl(c.before_ctime_sec);                               \
1316         *p++ = htonl(c.before_ctime_nsec);                              \
1317         *p++ = htonl(c.after_ctime_sec);                                \
1318         *p++ = htonl(c.after_ctime_nsec);                               \
1319 } while (0)
1320
1321 #define RESERVE_SPACE(nbytes)   do {                            \
1322         p = resp->p;                                            \
1323         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1324 } while (0)
1325 #define ADJUST_ARGS()           resp->p = p
1326
1327 /*
1328  * Header routine to setup seqid operation replay cache
1329  */
1330 #define ENCODE_SEQID_OP_HEAD                                    \
1331         u32 *p;                                                 \
1332         u32 *save;                                              \
1333                                                                 \
1334         save = resp->p;
1335
1336 /*
1337  * Routine for encoding the result of a
1338  * "seqid-mutating" NFSv4 operation.  This is
1339  * where seqids are incremented, and the
1340  * replay cache is filled.
1341  */
1342
1343 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1344         if (seqid_mutating_err(nfserr) && stateowner) {         \
1345                 if (stateowner->so_confirmed)                   \
1346                         stateowner->so_seqid++;                 \
1347                 stateowner->so_replay.rp_status = nfserr;       \
1348                 stateowner->so_replay.rp_buflen =               \
1349                           (((char *)(resp)->p - (char *)save)); \
1350                 memcpy(stateowner->so_replay.rp_buf, save,      \
1351                         stateowner->so_replay.rp_buflen);       \
1352         } } while (0);
1353
1354
1355 static u32 nfs4_ftypes[16] = {
1356         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1357         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1358         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1359         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1360 };
1361
1362 static int
1363 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1364                         u32 **p, int *buflen)
1365 {
1366         int status;
1367
1368         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1369                 return nfserr_resource;
1370         if (whotype != NFS4_ACL_WHO_NAMED)
1371                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1372         else if (group)
1373                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1374         else
1375                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1376         if (status < 0)
1377                 return nfserrno(status);
1378         *p = xdr_encode_opaque(*p, NULL, status);
1379         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1380         BUG_ON(*buflen < 0);
1381         return 0;
1382 }
1383
1384 static inline int
1385 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, u32 **p, int *buflen)
1386 {
1387         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1388 }
1389
1390 static inline int
1391 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, u32 **p, int *buflen)
1392 {
1393         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1394 }
1395
1396 static inline int
1397 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1398                 u32 **p, int *buflen)
1399 {
1400         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1401 }
1402
1403
1404 /*
1405  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1406  * ourselves.
1407  *
1408  * @countp is the buffer size in _words_; upon successful return this becomes
1409  * replaced with the number of words written.
1410  */
1411 int
1412 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1413                 struct dentry *dentry, u32 *buffer, int *countp, u32 *bmval,
1414                 struct svc_rqst *rqstp)
1415 {
1416         u32 bmval0 = bmval[0];
1417         u32 bmval1 = bmval[1];
1418         struct kstat stat;
1419         struct svc_fh tempfh;
1420         struct kstatfs statfs;
1421         int buflen = *countp << 2;
1422         u32 *attrlenp;
1423         u32 dummy;
1424         u64 dummy64;
1425         u32 *p = buffer;
1426         int status;
1427         int aclsupport = 0;
1428         struct nfs4_acl *acl = NULL;
1429
1430         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1431         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1432         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1433
1434         status = vfs_getattr(exp->ex_mnt, dentry, &stat);
1435         if (status)
1436                 goto out_nfserr;
1437         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1438             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1439                        FATTR4_WORD1_SPACE_TOTAL))) {
1440                 status = vfs_statfs(dentry->d_inode->i_sb, &statfs);
1441                 if (status)
1442                         goto out_nfserr;
1443         }
1444         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1445                 fh_init(&tempfh, NFS4_FHSIZE);
1446                 status = fh_compose(&tempfh, exp, dentry, NULL);
1447                 if (status)
1448                         goto out;
1449                 fhp = &tempfh;
1450         }
1451         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1452                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1453                 status = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1454                 aclsupport = (status == 0);
1455                 if (bmval0 & FATTR4_WORD0_ACL) {
1456                         if (status == -EOPNOTSUPP)
1457                                 bmval0 &= ~FATTR4_WORD0_ACL;
1458                         else if (status != 0)
1459                                 goto out_nfserr;
1460                 }
1461         }
1462         if ((buflen -= 16) < 0)
1463                 goto out_resource;
1464
1465         WRITE32(2);
1466         WRITE32(bmval0);
1467         WRITE32(bmval1);
1468         attrlenp = p++;                /* to be backfilled later */
1469
1470         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1471                 if ((buflen -= 12) < 0)
1472                         goto out_resource;
1473                 WRITE32(2);
1474                 WRITE32(aclsupport ?
1475                         NFSD_SUPPORTED_ATTRS_WORD0 :
1476                         NFSD_SUPPORTED_ATTRS_WORD0 & ~FATTR4_WORD0_ACL);
1477                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1478         }
1479         if (bmval0 & FATTR4_WORD0_TYPE) {
1480                 if ((buflen -= 4) < 0)
1481                         goto out_resource;
1482                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1483                 if (dummy == NF4BAD)
1484                         goto out_serverfault;
1485                 WRITE32(dummy);
1486         }
1487         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1488                 if ((buflen -= 4) < 0)
1489                         goto out_resource;
1490                 WRITE32( NFS4_FH_NOEXPIRE_WITH_OPEN | NFS4_FH_VOL_RENAME );
1491         }
1492         if (bmval0 & FATTR4_WORD0_CHANGE) {
1493                 /*
1494                  * Note: This _must_ be consistent with the scheme for writing
1495                  * change_info, so any changes made here must be reflected there
1496                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1497                  * macro above.)
1498                  */
1499                 if ((buflen -= 8) < 0)
1500                         goto out_resource;
1501                 WRITE32(stat.ctime.tv_sec);
1502                 WRITE32(stat.ctime.tv_nsec);
1503         }
1504         if (bmval0 & FATTR4_WORD0_SIZE) {
1505                 if ((buflen -= 8) < 0)
1506                         goto out_resource;
1507                 WRITE64(stat.size);
1508         }
1509         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1510                 if ((buflen -= 4) < 0)
1511                         goto out_resource;
1512                 WRITE32(1);
1513         }
1514         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1515                 if ((buflen -= 4) < 0)
1516                         goto out_resource;
1517                 WRITE32(1);
1518         }
1519         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1520                 if ((buflen -= 4) < 0)
1521                         goto out_resource;
1522                 WRITE32(0);
1523         }
1524         if (bmval0 & FATTR4_WORD0_FSID) {
1525                 if ((buflen -= 16) < 0)
1526                         goto out_resource;
1527                 if (is_fsid(fhp, rqstp->rq_reffh)) {
1528                         WRITE64((u64)exp->ex_fsid);
1529                         WRITE64((u64)0);
1530                 } else {
1531                         WRITE32(0);
1532                         WRITE32(MAJOR(stat.dev));
1533                         WRITE32(0);
1534                         WRITE32(MINOR(stat.dev));
1535                 }
1536         }
1537         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1538                 if ((buflen -= 4) < 0)
1539                         goto out_resource;
1540                 WRITE32(0);
1541         }
1542         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1543                 if ((buflen -= 4) < 0)
1544                         goto out_resource;
1545                 WRITE32(NFSD_LEASE_TIME);
1546         }
1547         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1548                 if ((buflen -= 4) < 0)
1549                         goto out_resource;
1550                 WRITE32(0);
1551         }
1552         if (bmval0 & FATTR4_WORD0_ACL) {
1553                 struct nfs4_ace *ace;
1554                 struct list_head *h;
1555
1556                 if (acl == NULL) {
1557                         if ((buflen -= 4) < 0)
1558                                 goto out_resource;
1559
1560                         WRITE32(0);
1561                         goto out_acl;
1562                 }
1563                 if ((buflen -= 4) < 0)
1564                         goto out_resource;
1565                 WRITE32(acl->naces);
1566
1567                 list_for_each(h, &acl->ace_head) {
1568                         ace = list_entry(h, struct nfs4_ace, l_ace);
1569
1570                         if ((buflen -= 4*3) < 0)
1571                                 goto out_resource;
1572                         WRITE32(ace->type);
1573                         WRITE32(ace->flag);
1574                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1575                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1576                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1577                                 &p, &buflen);
1578                         if (status == nfserr_resource)
1579                                 goto out_resource;
1580                         if (status)
1581                                 goto out;
1582                 }
1583         }
1584 out_acl:
1585         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1586                 if ((buflen -= 4) < 0)
1587                         goto out_resource;
1588                 WRITE32(aclsupport ?
1589                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1590         }
1591         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1592                 if ((buflen -= 4) < 0)
1593                         goto out_resource;
1594                 WRITE32(1);
1595         }
1596         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1597                 if ((buflen -= 4) < 0)
1598                         goto out_resource;
1599                 WRITE32(1);
1600         }
1601         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1602                 if ((buflen -= 4) < 0)
1603                         goto out_resource;
1604                 WRITE32(1);
1605         }
1606         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1607                 if ((buflen -= 4) < 0)
1608                         goto out_resource;
1609                 WRITE32(1);
1610         }
1611         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1612                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1613                 if (buflen < 0)
1614                         goto out_resource;
1615                 WRITE32(fhp->fh_handle.fh_size);
1616                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1617         }
1618         if (bmval0 & FATTR4_WORD0_FILEID) {
1619                 if ((buflen -= 8) < 0)
1620                         goto out_resource;
1621                 WRITE64((u64) stat.ino);
1622         }
1623         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1624                 if ((buflen -= 8) < 0)
1625                         goto out_resource;
1626                 WRITE64((u64) statfs.f_ffree);
1627         }
1628         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1629                 if ((buflen -= 8) < 0)
1630                         goto out_resource;
1631                 WRITE64((u64) statfs.f_ffree);
1632         }
1633         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1634                 if ((buflen -= 8) < 0)
1635                         goto out_resource;
1636                 WRITE64((u64) statfs.f_files);
1637         }
1638         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1639                 if ((buflen -= 4) < 0)
1640                         goto out_resource;
1641                 WRITE32(1);
1642         }
1643         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1644                 if ((buflen -= 8) < 0)
1645                         goto out_resource;
1646                 WRITE64(~(u64)0);
1647         }
1648         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1649                 if ((buflen -= 4) < 0)
1650                         goto out_resource;
1651                 WRITE32(255);
1652         }
1653         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1654                 if ((buflen -= 4) < 0)
1655                         goto out_resource;
1656                 WRITE32(~(u32) 0);
1657         }
1658         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1659                 if ((buflen -= 8) < 0)
1660                         goto out_resource;
1661                 WRITE64((u64) NFSSVC_MAXBLKSIZE);
1662         }
1663         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1664                 if ((buflen -= 8) < 0)
1665                         goto out_resource;
1666                 WRITE64((u64) NFSSVC_MAXBLKSIZE);
1667         }
1668         if (bmval1 & FATTR4_WORD1_MODE) {
1669                 if ((buflen -= 4) < 0)
1670                         goto out_resource;
1671                 WRITE32(stat.mode & S_IALLUGO);
1672         }
1673         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1674                 if ((buflen -= 4) < 0)
1675                         goto out_resource;
1676                 WRITE32(1);
1677         }
1678         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1679                 if ((buflen -= 4) < 0)
1680                         goto out_resource;
1681                 WRITE32(stat.nlink);
1682         }
1683         if (bmval1 & FATTR4_WORD1_OWNER) {
1684                 status = nfsd4_encode_user(rqstp,
1685                         XIDINO_UID(XID_TAG(dentry->d_inode),
1686                         stat.uid, stat.xid), &p, &buflen);
1687                 if (status == nfserr_resource)
1688                         goto out_resource;
1689                 if (status)
1690                         goto out;
1691         }
1692         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1693                 status = nfsd4_encode_group(rqstp,
1694                         XIDINO_GID(XID_TAG(dentry->d_inode),
1695                         stat.gid, stat.xid), &p, &buflen);
1696                 if (status == nfserr_resource)
1697                         goto out_resource;
1698                 if (status)
1699                         goto out;
1700         }
1701         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1702                 if ((buflen -= 8) < 0)
1703                         goto out_resource;
1704                 WRITE32((u32) MAJOR(stat.rdev));
1705                 WRITE32((u32) MINOR(stat.rdev));
1706         }
1707         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1708                 if ((buflen -= 8) < 0)
1709                         goto out_resource;
1710                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1711                 WRITE64(dummy64);
1712         }
1713         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1714                 if ((buflen -= 8) < 0)
1715                         goto out_resource;
1716                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1717                 WRITE64(dummy64);
1718         }
1719         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1720                 if ((buflen -= 8) < 0)
1721                         goto out_resource;
1722                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1723                 WRITE64(dummy64);
1724         }
1725         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1726                 if ((buflen -= 8) < 0)
1727                         goto out_resource;
1728                 dummy64 = (u64)stat.blocks << 9;
1729                 WRITE64(dummy64);
1730         }
1731         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1732                 if ((buflen -= 12) < 0)
1733                         goto out_resource;
1734                 WRITE32(0);
1735                 WRITE32(stat.atime.tv_sec);
1736                 WRITE32(stat.atime.tv_nsec);
1737         }
1738         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1739                 if ((buflen -= 12) < 0)
1740                         goto out_resource;
1741                 WRITE32(0);
1742                 WRITE32(1);
1743                 WRITE32(0);
1744         }
1745         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1746                 if ((buflen -= 12) < 0)
1747                         goto out_resource;
1748                 WRITE32(0);
1749                 WRITE32(stat.ctime.tv_sec);
1750                 WRITE32(stat.ctime.tv_nsec);
1751         }
1752         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1753                 if ((buflen -= 12) < 0)
1754                         goto out_resource;
1755                 WRITE32(0);
1756                 WRITE32(stat.mtime.tv_sec);
1757                 WRITE32(stat.mtime.tv_nsec);
1758         }
1759         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1760                 struct dentry *mnt_pnt, *mnt_root;
1761
1762                 if ((buflen -= 8) < 0)
1763                         goto out_resource;
1764                 mnt_root = exp->ex_mnt->mnt_root;
1765                 if (mnt_root->d_inode == dentry->d_inode) {
1766                         mnt_pnt = exp->ex_mnt->mnt_mountpoint;
1767                         WRITE64((u64) mnt_pnt->d_inode->i_ino);
1768                 } else
1769                         WRITE64((u64) stat.ino);
1770         }
1771         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1772         *countp = p - buffer;
1773         status = nfs_ok;
1774
1775 out:
1776         nfs4_acl_free(acl);
1777         if (fhp == &tempfh)
1778                 fh_put(&tempfh);
1779         return status;
1780 out_nfserr:
1781         status = nfserrno(status);
1782         goto out;
1783 out_resource:
1784         *countp = 0;
1785         status = nfserr_resource;
1786         goto out;
1787 out_serverfault:
1788         status = nfserr_serverfault;
1789         goto out;
1790 }
1791
1792 static int
1793 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1794                 const char *name, int namlen, u32 *p, int *buflen)
1795 {
1796         struct svc_export *exp = cd->rd_fhp->fh_export;
1797         struct dentry *dentry;
1798         int nfserr;
1799
1800         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1801         if (IS_ERR(dentry))
1802                 return nfserrno(PTR_ERR(dentry));
1803
1804         exp_get(exp);
1805         if (d_mountpoint(dentry)) {
1806                 if (nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp)) {
1807                 /*
1808                  * -EAGAIN is the only error returned from
1809                  * nfsd_cross_mnt() and it indicates that an
1810                  * up-call has  been initiated to fill in the export
1811                  * options on exp.  When the answer comes back,
1812                  * this call will be retried.
1813                  */
1814                         nfserr = nfserr_dropit;
1815                         goto out_put;
1816                 }
1817
1818         }
1819         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1820                                         cd->rd_rqstp);
1821 out_put:
1822         dput(dentry);
1823         exp_put(exp);
1824         return nfserr;
1825 }
1826
1827 static u32 *
1828 nfsd4_encode_rdattr_error(u32 *p, int buflen, int nfserr)
1829 {
1830         u32 *attrlenp;
1831
1832         if (buflen < 6)
1833                 return NULL;
1834         *p++ = htonl(2);
1835         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1836         *p++ = htonl(0);                         /* bmval1 */
1837
1838         attrlenp = p++;
1839         *p++ = nfserr;       /* no htonl */
1840         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1841         return p;
1842 }
1843
1844 static int
1845 nfsd4_encode_dirent(struct readdir_cd *ccd, const char *name, int namlen,
1846                     loff_t offset, ino_t ino, unsigned int d_type)
1847 {
1848         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1849         int buflen;
1850         u32 *p = cd->buffer;
1851         int nfserr = nfserr_toosmall;
1852
1853         /* In nfsv4, "." and ".." never make it onto the wire.. */
1854         if (name && isdotent(name, namlen)) {
1855                 cd->common.err = nfs_ok;
1856                 return 0;
1857         }
1858
1859         if (cd->offset)
1860                 xdr_encode_hyper(cd->offset, (u64) offset);
1861
1862         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1863         if (buflen < 0)
1864                 goto fail;
1865
1866         *p++ = xdr_one;                             /* mark entry present */
1867         cd->offset = p;                             /* remember pointer */
1868         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1869         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1870
1871         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1872         switch (nfserr) {
1873         case nfs_ok:
1874                 p += buflen;
1875                 break;
1876         case nfserr_resource:
1877                 nfserr = nfserr_toosmall;
1878                 goto fail;
1879         case nfserr_dropit:
1880                 goto fail;
1881         default:
1882                 /*
1883                  * If the client requested the RDATTR_ERROR attribute,
1884                  * we stuff the error code into this attribute
1885                  * and continue.  If this attribute was not requested,
1886                  * then in accordance with the spec, we fail the
1887                  * entire READDIR operation(!)
1888                  */
1889                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1890                         goto fail;
1891                 nfserr = nfserr_toosmall;
1892                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1893                 if (p == NULL)
1894                         goto fail;
1895         }
1896         cd->buflen -= (p - cd->buffer);
1897         cd->buffer = p;
1898         cd->common.err = nfs_ok;
1899         return 0;
1900 fail:
1901         cd->common.err = nfserr;
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 ? ld->ld_sop->so_owner.len : 0));
2004         WRITE64(ld->ld_start);
2005         WRITE64(ld->ld_length);
2006         WRITE32(ld->ld_type);
2007         if (ld->ld_sop) {
2008                 WRITEMEM(&ld->ld_clientid, 8);
2009                 WRITE32(ld->ld_sop->so_owner.len);
2010                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2011                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2012         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2013                 WRITE64((u64)0); /* clientid */
2014                 WRITE32(0); /* length of owner name */
2015         }
2016         ADJUST_ARGS();
2017 }
2018
2019 static void
2020 nfsd4_encode_lock(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lock *lock)
2021 {
2022
2023         ENCODE_SEQID_OP_HEAD;
2024
2025         if (!nfserr) {
2026                 RESERVE_SPACE(4 + sizeof(stateid_t));
2027                 WRITE32(lock->lk_resp_stateid.si_generation);
2028                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2029                 ADJUST_ARGS();
2030         } else if (nfserr == nfserr_denied)
2031                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2032
2033         ENCODE_SEQID_OP_TAIL(lock->lk_stateowner);
2034 }
2035
2036 static void
2037 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lockt *lockt)
2038 {
2039         if (nfserr == nfserr_denied)
2040                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2041 }
2042
2043 static void
2044 nfsd4_encode_locku(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_locku *locku)
2045 {
2046         ENCODE_SEQID_OP_HEAD;
2047
2048         if (!nfserr) {
2049                 RESERVE_SPACE(sizeof(stateid_t));
2050                 WRITE32(locku->lu_stateid.si_generation);
2051                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2052                 ADJUST_ARGS();
2053         }
2054
2055         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2056 }
2057
2058
2059 static void
2060 nfsd4_encode_link(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_link *link)
2061 {
2062         ENCODE_HEAD;
2063
2064         if (!nfserr) {
2065                 RESERVE_SPACE(20);
2066                 WRITECINFO(link->li_cinfo);
2067                 ADJUST_ARGS();
2068         }
2069 }
2070
2071
2072 static void
2073 nfsd4_encode_open(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open *open)
2074 {
2075         ENCODE_SEQID_OP_HEAD;
2076
2077         if (nfserr)
2078                 goto out;
2079
2080         RESERVE_SPACE(36 + sizeof(stateid_t));
2081         WRITE32(open->op_stateid.si_generation);
2082         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2083         WRITECINFO(open->op_cinfo);
2084         WRITE32(open->op_rflags);
2085         WRITE32(2);
2086         WRITE32(open->op_bmval[0]);
2087         WRITE32(open->op_bmval[1]);
2088         WRITE32(open->op_delegate_type);
2089         ADJUST_ARGS();
2090
2091         switch (open->op_delegate_type) {
2092         case NFS4_OPEN_DELEGATE_NONE:
2093                 break;
2094         case NFS4_OPEN_DELEGATE_READ:
2095                 RESERVE_SPACE(20 + sizeof(stateid_t));
2096                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2097                 WRITE32(0);
2098
2099                 /*
2100                  * TODO: ACE's in delegations
2101                  */
2102                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2103                 WRITE32(0);
2104                 WRITE32(0);
2105                 WRITE32(0);   /* XXX: is NULL principal ok? */
2106                 ADJUST_ARGS();
2107                 break;
2108         case NFS4_OPEN_DELEGATE_WRITE:
2109                 RESERVE_SPACE(32 + sizeof(stateid_t));
2110                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2111                 WRITE32(0);
2112
2113                 /*
2114                  * TODO: space_limit's in delegations
2115                  */
2116                 WRITE32(NFS4_LIMIT_SIZE);
2117                 WRITE32(~(u32)0);
2118                 WRITE32(~(u32)0);
2119
2120                 /*
2121                  * TODO: ACE's in delegations
2122                  */
2123                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2124                 WRITE32(0);
2125                 WRITE32(0);
2126                 WRITE32(0);   /* XXX: is NULL principal ok? */
2127                 ADJUST_ARGS();
2128                 break;
2129         default:
2130                 BUG();
2131         }
2132         /* XXX save filehandle here */
2133 out:
2134         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2135 }
2136
2137 static void
2138 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_confirm *oc)
2139 {
2140         ENCODE_SEQID_OP_HEAD;
2141
2142         if (!nfserr) {
2143                 RESERVE_SPACE(sizeof(stateid_t));
2144                 WRITE32(oc->oc_resp_stateid.si_generation);
2145                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2146                 ADJUST_ARGS();
2147         }
2148
2149         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2150 }
2151
2152 static void
2153 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_downgrade *od)
2154 {
2155         ENCODE_SEQID_OP_HEAD;
2156
2157         if (!nfserr) {
2158                 RESERVE_SPACE(sizeof(stateid_t));
2159                 WRITE32(od->od_stateid.si_generation);
2160                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2161                 ADJUST_ARGS();
2162         }
2163
2164         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2165 }
2166
2167 static int
2168 nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_read *read)
2169 {
2170         u32 eof;
2171         int v, pn;
2172         unsigned long maxcount;
2173         long len;
2174         ENCODE_HEAD;
2175
2176         if (nfserr)
2177                 return nfserr;
2178         if (resp->xbuf->page_len)
2179                 return nfserr_resource;
2180
2181         RESERVE_SPACE(8); /* eof flag and byte count */
2182
2183         maxcount = NFSSVC_MAXBLKSIZE;
2184         if (maxcount > read->rd_length)
2185                 maxcount = read->rd_length;
2186
2187         len = maxcount;
2188         v = 0;
2189         while (len > 0) {
2190                 pn = resp->rqstp->rq_resused;
2191                 svc_take_page(resp->rqstp);
2192                 read->rd_iov[v].iov_base = page_address(resp->rqstp->rq_respages[pn]);
2193                 read->rd_iov[v].iov_len = len < PAGE_SIZE ? len : PAGE_SIZE;
2194                 v++;
2195                 len -= PAGE_SIZE;
2196         }
2197         read->rd_vlen = v;
2198
2199         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp,
2200                            read->rd_offset,
2201                            read->rd_iov, read->rd_vlen,
2202                            &maxcount);
2203         if (nfserr == nfserr_symlink)
2204                 nfserr = nfserr_inval;
2205         if (nfserr)
2206                 return nfserr;
2207         eof = (read->rd_offset + maxcount >= read->rd_fhp->fh_dentry->d_inode->i_size);
2208
2209         WRITE32(eof);
2210         WRITE32(maxcount);
2211         ADJUST_ARGS();
2212         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2213
2214         resp->xbuf->page_len = maxcount;
2215
2216         /* read zero bytes -> don't set up tail */
2217         if(!maxcount)
2218                 return 0;
2219
2220         /* set up page for remaining responses */
2221         svc_take_page(resp->rqstp);
2222         resp->xbuf->tail[0].iov_base =
2223                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2224         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2225         resp->xbuf->tail[0].iov_len = 0;
2226         resp->p = resp->xbuf->tail[0].iov_base;
2227         resp->end = resp->p + PAGE_SIZE/4;
2228
2229         if (maxcount&3) {
2230                 *(resp->p)++ = 0;
2231                 resp->xbuf->tail[0].iov_base += maxcount&3;
2232                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2233         }
2234         return 0;
2235 }
2236
2237 static int
2238 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readlink *readlink)
2239 {
2240         int maxcount;
2241         char *page;
2242         ENCODE_HEAD;
2243
2244         if (nfserr)
2245                 return nfserr;
2246         if (resp->xbuf->page_len)
2247                 return nfserr_resource;
2248
2249         svc_take_page(resp->rqstp);
2250         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2251
2252         maxcount = PAGE_SIZE;
2253         RESERVE_SPACE(4);
2254
2255         /*
2256          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2257          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2258          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2259          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2260          */
2261         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2262         if (nfserr == nfserr_isdir)
2263                 return nfserr_inval;
2264         if (nfserr)
2265                 return nfserr;
2266
2267         WRITE32(maxcount);
2268         ADJUST_ARGS();
2269         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2270
2271         svc_take_page(resp->rqstp);
2272         resp->xbuf->tail[0].iov_base =
2273                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2274         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2275         resp->xbuf->tail[0].iov_len = 0;
2276         resp->p = resp->xbuf->tail[0].iov_base;
2277         resp->end = resp->p + PAGE_SIZE/4;
2278
2279         resp->xbuf->page_len = maxcount;
2280         if (maxcount&3) {
2281                 *(resp->p)++ = 0;
2282                 resp->xbuf->tail[0].iov_base += maxcount&3;
2283                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2284         }
2285         return 0;
2286 }
2287
2288 static int
2289 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readdir *readdir)
2290 {
2291         int maxcount;
2292         loff_t offset;
2293         u32 *page, *savep;
2294         ENCODE_HEAD;
2295
2296         if (nfserr)
2297                 return nfserr;
2298         if (resp->xbuf->page_len)
2299                 return nfserr_resource;
2300
2301         RESERVE_SPACE(8);  /* verifier */
2302         savep = p;
2303
2304         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2305         WRITE32(0);
2306         WRITE32(0);
2307         ADJUST_ARGS();
2308         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2309
2310         maxcount = PAGE_SIZE;
2311         if (maxcount > readdir->rd_maxcount)
2312                 maxcount = readdir->rd_maxcount;
2313
2314         /*
2315          * Convert from bytes to words, account for the two words already
2316          * written, make sure to leave two words at the end for the next
2317          * pointer and eof field.
2318          */
2319         maxcount = (maxcount >> 2) - 4;
2320         if (maxcount < 0) {
2321                 nfserr =  nfserr_toosmall;
2322                 goto err_no_verf;
2323         }
2324
2325         svc_take_page(resp->rqstp);
2326         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2327         readdir->common.err = 0;
2328         readdir->buflen = maxcount;
2329         readdir->buffer = page;
2330         readdir->offset = NULL;
2331
2332         offset = readdir->rd_cookie;
2333         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2334                               &offset,
2335                               &readdir->common, nfsd4_encode_dirent);
2336         if (nfserr == nfs_ok &&
2337             readdir->common.err == nfserr_toosmall &&
2338             readdir->buffer == page)
2339                 nfserr = nfserr_toosmall;
2340         if (nfserr == nfserr_symlink)
2341                 nfserr = nfserr_notdir;
2342         if (nfserr)
2343                 goto err_no_verf;
2344
2345         if (readdir->offset)
2346                 xdr_encode_hyper(readdir->offset, offset);
2347
2348         p = readdir->buffer;
2349         *p++ = 0;       /* no more entries */
2350         *p++ = htonl(readdir->common.err == nfserr_eof);
2351         resp->xbuf->page_len = ((char*)p) - (char*)page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2352
2353         /* allocate a page for the tail */
2354         svc_take_page(resp->rqstp);
2355         resp->xbuf->tail[0].iov_base =
2356                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2357         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2358         resp->xbuf->tail[0].iov_len = 0;
2359         resp->p = resp->xbuf->tail[0].iov_base;
2360         resp->end = resp->p + PAGE_SIZE/4;
2361
2362         return 0;
2363 err_no_verf:
2364         p = savep;
2365         ADJUST_ARGS();
2366         return nfserr;
2367 }
2368
2369 static void
2370 nfsd4_encode_remove(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_remove *remove)
2371 {
2372         ENCODE_HEAD;
2373
2374         if (!nfserr) {
2375                 RESERVE_SPACE(20);
2376                 WRITECINFO(remove->rm_cinfo);
2377                 ADJUST_ARGS();
2378         }
2379 }
2380
2381 static void
2382 nfsd4_encode_rename(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_rename *rename)
2383 {
2384         ENCODE_HEAD;
2385
2386         if (!nfserr) {
2387                 RESERVE_SPACE(40);
2388                 WRITECINFO(rename->rn_sinfo);
2389                 WRITECINFO(rename->rn_tinfo);
2390                 ADJUST_ARGS();
2391         }
2392 }
2393
2394 /*
2395  * The SETATTR encode routine is special -- it always encodes a bitmap,
2396  * regardless of the error status.
2397  */
2398 static void
2399 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setattr *setattr)
2400 {
2401         ENCODE_HEAD;
2402
2403         RESERVE_SPACE(12);
2404         if (nfserr) {
2405                 WRITE32(2);
2406                 WRITE32(0);
2407                 WRITE32(0);
2408         }
2409         else {
2410                 WRITE32(2);
2411                 WRITE32(setattr->sa_bmval[0]);
2412                 WRITE32(setattr->sa_bmval[1]);
2413         }
2414         ADJUST_ARGS();
2415 }
2416
2417 static void
2418 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setclientid *scd)
2419 {
2420         ENCODE_HEAD;
2421
2422         if (!nfserr) {
2423                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2424                 WRITEMEM(&scd->se_clientid, 8);
2425                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2426                 ADJUST_ARGS();
2427         }
2428         else if (nfserr == nfserr_clid_inuse) {
2429                 RESERVE_SPACE(8);
2430                 WRITE32(0);
2431                 WRITE32(0);
2432                 ADJUST_ARGS();
2433         }
2434 }
2435
2436 static void
2437 nfsd4_encode_write(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_write *write)
2438 {
2439         ENCODE_HEAD;
2440
2441         if (!nfserr) {
2442                 RESERVE_SPACE(16);
2443                 WRITE32(write->wr_bytes_written);
2444                 WRITE32(write->wr_how_written);
2445                 WRITEMEM(write->wr_verifier.data, 8);
2446                 ADJUST_ARGS();
2447         }
2448 }
2449
2450 void
2451 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2452 {
2453         u32 *statp;
2454         ENCODE_HEAD;
2455
2456         RESERVE_SPACE(8);
2457         WRITE32(op->opnum);
2458         statp = p++;    /* to be backfilled at the end */
2459         ADJUST_ARGS();
2460
2461         switch (op->opnum) {
2462         case OP_ACCESS:
2463                 nfsd4_encode_access(resp, op->status, &op->u.access);
2464                 break;
2465         case OP_CLOSE:
2466                 nfsd4_encode_close(resp, op->status, &op->u.close);
2467                 break;
2468         case OP_COMMIT:
2469                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2470                 break;
2471         case OP_CREATE:
2472                 nfsd4_encode_create(resp, op->status, &op->u.create);
2473                 break;
2474         case OP_DELEGRETURN:
2475                 break;
2476         case OP_GETATTR:
2477                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2478                 break;
2479         case OP_GETFH:
2480                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2481                 break;
2482         case OP_LINK:
2483                 nfsd4_encode_link(resp, op->status, &op->u.link);
2484                 break;
2485         case OP_LOCK:
2486                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2487                 break;
2488         case OP_LOCKT:
2489                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2490                 break;
2491         case OP_LOCKU:
2492                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2493                 break;
2494         case OP_LOOKUP:
2495                 break;
2496         case OP_LOOKUPP:
2497                 break;
2498         case OP_NVERIFY:
2499                 break;
2500         case OP_OPEN:
2501                 nfsd4_encode_open(resp, op->status, &op->u.open);
2502                 break;
2503         case OP_OPEN_CONFIRM:
2504                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2505                 break;
2506         case OP_OPEN_DOWNGRADE:
2507                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2508                 break;
2509         case OP_PUTFH:
2510                 break;
2511         case OP_PUTROOTFH:
2512                 break;
2513         case OP_READ:
2514                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2515                 break;
2516         case OP_READDIR:
2517                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2518                 break;
2519         case OP_READLINK:
2520                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2521                 break;
2522         case OP_REMOVE:
2523                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2524                 break;
2525         case OP_RENAME:
2526                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2527                 break;
2528         case OP_RENEW:
2529                 break;
2530         case OP_RESTOREFH:
2531                 break;
2532         case OP_SAVEFH:
2533                 break;
2534         case OP_SETATTR:
2535                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2536                 break;
2537         case OP_SETCLIENTID:
2538                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2539                 break;
2540         case OP_SETCLIENTID_CONFIRM:
2541                 break;
2542         case OP_VERIFY:
2543                 break;
2544         case OP_WRITE:
2545                 nfsd4_encode_write(resp, op->status, &op->u.write);
2546                 break;
2547         case OP_RELEASE_LOCKOWNER:
2548                 break;
2549         default:
2550                 break;
2551         }
2552
2553         /*
2554          * Note: We write the status directly, instead of using WRITE32(),
2555          * since it is already in network byte order.
2556          */
2557         *statp = op->status;
2558 }
2559
2560 /*
2561  * Encode the reply stored in the stateowner reply cache
2562  *
2563  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2564  * previously sent already encoded operation.
2565  *
2566  * called with nfs4_lock_state() held
2567  */
2568 void
2569 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2570 {
2571         ENCODE_HEAD;
2572         struct nfs4_replay *rp = op->replay;
2573
2574         BUG_ON(!rp);
2575
2576         RESERVE_SPACE(8);
2577         WRITE32(op->opnum);
2578         *p++ = rp->rp_status;  /* already xdr'ed */
2579         ADJUST_ARGS();
2580
2581         RESERVE_SPACE(rp->rp_buflen);
2582         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2583         ADJUST_ARGS();
2584 }
2585
2586 /*
2587  * END OF "GENERIC" ENCODE ROUTINES.
2588  */
2589
2590 int
2591 nfs4svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
2592 {
2593         return xdr_ressize_check(rqstp, p);
2594 }
2595
2596 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2597 {
2598         if (args->ops != args->iops) {
2599                 kfree(args->ops);
2600                 args->ops = args->iops;
2601         }
2602         if (args->tmpp) {
2603                 kfree(args->tmpp);
2604                 args->tmpp = NULL;
2605         }
2606         while (args->to_free) {
2607                 struct tmpbuf *tb = args->to_free;
2608                 args->to_free = tb->next;
2609                 tb->release(tb->buf);
2610                 kfree(tb);
2611         }
2612 }
2613
2614 int
2615 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundargs *args)
2616 {
2617         int status;
2618
2619         args->p = p;
2620         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2621         args->pagelist = rqstp->rq_arg.pages;
2622         args->pagelen = rqstp->rq_arg.page_len;
2623         args->tmpp = NULL;
2624         args->to_free = NULL;
2625         args->ops = args->iops;
2626         args->rqstp = rqstp;
2627
2628         status = nfsd4_decode_compound(args);
2629         if (status) {
2630                 nfsd4_release_compoundargs(args);
2631         }
2632         return !status;
2633 }
2634
2635 int
2636 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundres *resp)
2637 {
2638         /*
2639          * All that remains is to write the tag and operation count...
2640          */
2641         struct kvec *iov;
2642         p = resp->tagp;
2643         *p++ = htonl(resp->taglen);
2644         memcpy(p, resp->tag, resp->taglen);
2645         p += XDR_QUADLEN(resp->taglen);
2646         *p++ = htonl(resp->opcnt);
2647
2648         if (rqstp->rq_res.page_len)
2649                 iov = &rqstp->rq_res.tail[0];
2650         else
2651                 iov = &rqstp->rq_res.head[0];
2652         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2653         BUG_ON(iov->iov_len > PAGE_SIZE);
2654         return 1;
2655 }
2656
2657 /*
2658  * Local variables:
2659  *  c-basic-offset: 8
2660  * End:
2661  */