fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * TODO: Neil Brown made the following observation:  We currently
  36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37  * never release any of that until the request is complete.
  38  * It would be good to calculate a new maximum response size while
  39  * decoding the COMPOUND, and call svc_reserve with this number
  40  * at the end of nfs4svc_decode_compoundargs.
  41  */
  42
  43 #include <linux/slab.h>
  44 #include <linux/namei.h>
  45 #include <linux/statfs.h>
  46 #include <linux/utsname.h>
  47 #include <linux/sunrpc/svcauth_gss.h>
  48
  49 #include "idmap.h"
  50 #include "acl.h"
  51 #include "xdr4.h"
  52 #include "vfs.h"
  53
  54
  55 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  56
  57 /*
  58  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  59  * directory in order to indicate to the client that a filesystem boundary is present
  60  * We use a fixed fsid for a referral
  61  */
  62 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  63 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  64
  65 static __be32
  66 check_filename(char *str, int len, __be32 err)
  67 {
  68         int i;
  69
  70         if (len == 0)
  71                 return nfserr_inval;
  72         if (isdotent(str, len))
  73                 return err;
  74         for (i = 0; i < len; i++)
  75                 if (str[i] == '/')
  76                         return err;
  77         return 0;
  78 }
  79
  80 #define DECODE_HEAD                             \
  81         __be32 *p;                              \
  82         __be32 status
  83 #define DECODE_TAIL                             \
  84         status = 0;                             \
  85 out:                                            \
  86         return status;                          \
  87 xdr_error:                                      \
  88         dprintk("NFSD: xdr error (%s:%d)\n",    \
  89                         __FILE__, __LINE__);    \
  90         status = nfserr_bad_xdr;                \
  91         goto out
  92
  93 #define READ32(x)         (x) = ntohl(*p++)
  94 #define READ64(x)         do {                  \
  95         (x) = (u64)ntohl(*p++) << 32;           \
  96         (x) |= ntohl(*p++);                     \
  97 } while (0)
  98 #define READTIME(x)       do {                  \
  99         p++;                                    \
 100         (x) = ntohl(*p++);                      \
 101         p++;                                    \
 102 } while (0)
 103 #define READMEM(x,nbytes) do {                  \
 104         x = (char *)p;                          \
 105         p += XDR_QUADLEN(nbytes);               \
 106 } while (0)
 107 #define SAVEMEM(x,nbytes) do {                  \
 108         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 109                 savemem(argp, p, nbytes) :      \
 110                 (char *)p)) {                   \
 111                 dprintk("NFSD: xdr error (%s:%d)\n", \
 112                                 __FILE__, __LINE__); \
 113                 goto xdr_error;                 \
 114                 }                               \
 115         p += XDR_QUADLEN(nbytes);               \
 116 } while (0)
 117 #define COPYMEM(x,nbytes) do {                  \
 118         memcpy((x), p, nbytes);                 \
 119         p += XDR_QUADLEN(nbytes);               \
 120 } while (0)
 121
 122 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 123 #define READ_BUF(nbytes)  do {                  \
 124         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 125                 p = argp->p;                    \
 126                 argp->p += XDR_QUADLEN(nbytes); \
 127         } else if (!(p = read_buf(argp, nbytes))) { \
 128                 dprintk("NFSD: xdr error (%s:%d)\n", \
 129                                 __FILE__, __LINE__); \
 130                 goto xdr_error;                 \
 131         }                                       \
 132 } while (0)
 133
 134 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 135 {
 136         /* We want more bytes than seem to be available.
 137          * Maybe we need a new page, maybe we have just run out
 138          */
 139         unsigned int avail = (char *)argp->end - (char *)argp->p;
 140         __be32 *p;
 141         if (avail + argp->pagelen < nbytes)
 142                 return NULL;
 143         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 144                 return NULL;
 145         /* ok, we can do it with the current plus the next page */
 146         if (nbytes <= sizeof(argp->tmp))
 147                 p = argp->tmp;
 148         else {
 149                 kfree(argp->tmpp);
 150                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 151                 if (!p)
 152                         return NULL;
 153
 154         }
 155         /*
 156          * The following memcpy is safe because read_buf is always
 157          * called with nbytes > avail, and the two cases above both
 158          * guarantee p points to at least nbytes bytes.
 159          */
 160         memcpy(p, argp->p, avail);
 161         /* step to next page */
 162         argp->p = page_address(argp->pagelist[0]);
 163         argp->pagelist++;
 164         if (argp->pagelen < PAGE_SIZE) {
 165                 argp->end = argp->p + (argp->pagelen>>2);
 166                 argp->pagelen = 0;
 167         } else {
 168                 argp->end = argp->p + (PAGE_SIZE>>2);
 169                 argp->pagelen -= PAGE_SIZE;
 170         }
 171         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 172         argp->p += XDR_QUADLEN(nbytes - avail);
 173         return p;
 174 }
 175
 176 static int zero_clientid(clientid_t *clid)
 177 {
 178         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 179 }
 180
 181 static int
 182 defer_free(struct nfsd4_compoundargs *argp,
 183                 void (*release)(const void *), void *p)
 184 {
 185         struct tmpbuf *tb;
 186
 187         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 188         if (!tb)
 189                 return -ENOMEM;
 190         tb->buf = p;
 191         tb->release = release;
 192         tb->next = argp->to_free;
 193         argp->to_free = tb;
 194         return 0;
 195 }
 196
 197 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 198 {
 199         if (p == argp->tmp) {
 200                 p = kmalloc(nbytes, GFP_KERNEL);
 201                 if (!p)
 202                         return NULL;
 203                 memcpy(p, argp->tmp, nbytes);
 204         } else {
 205                 BUG_ON(p != argp->tmpp);
 206                 argp->tmpp = NULL;
 207         }
 208         if (defer_free(argp, kfree, p)) {
 209                 kfree(p);
 210                 return NULL;
 211         } else
 212                 return (char *)p;
 213 }
 214
 215 static __be32
 216 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 217 {
 218         u32 bmlen;
 219         DECODE_HEAD;
 220
 221         bmval[0] = 0;
 222         bmval[1] = 0;
 223         bmval[2] = 0;
 224
 225         READ_BUF(4);
 226         READ32(bmlen);
 227         if (bmlen > 1000)
 228                 goto xdr_error;
 229
 230         READ_BUF(bmlen << 2);
 231         if (bmlen > 0)
 232                 READ32(bmval[0]);
 233         if (bmlen > 1)
 234                 READ32(bmval[1]);
 235         if (bmlen > 2)
 236                 READ32(bmval[2]);
 237
 238         DECODE_TAIL;
 239 }
 240
 241 static __be32
 242 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 243                    struct iattr *iattr, struct nfs4_acl **acl)
 244 {
 245         int expected_len, len = 0;
 246         u32 dummy32;
 247         char *buf;
 248         int host_err;
 249
 250         DECODE_HEAD;
 251         iattr->ia_valid = 0;
 252         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 253                 return status;
 254
 255         READ_BUF(4);
 256         READ32(expected_len);
 257
 258         if (bmval[0] & FATTR4_WORD0_SIZE) {
 259                 READ_BUF(8);
 260                 len += 8;
 261                 READ64(iattr->ia_size);
 262                 iattr->ia_valid |= ATTR_SIZE;
 263         }
 264         if (bmval[0] & FATTR4_WORD0_ACL) {
 265                 int nace;
 266                 struct nfs4_ace *ace;
 267
 268                 READ_BUF(4); len += 4;
 269                 READ32(nace);
 270
 271                 if (nace > NFS4_ACL_MAX)
 272                         return nfserr_resource;
 273
 274                 *acl = nfs4_acl_new(nace);
 275                 if (*acl == NULL) {
 276                         host_err = -ENOMEM;
 277                         goto out_nfserr;
 278                 }
 279                 defer_free(argp, kfree, *acl);
 280
 281                 (*acl)->naces = nace;
 282                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 283                         READ_BUF(16); len += 16;
 284                         READ32(ace->type);
 285                         READ32(ace->flag);
 286                         READ32(ace->access_mask);
 287                         READ32(dummy32);
 288                         READ_BUF(dummy32);
 289                         len += XDR_QUADLEN(dummy32) << 2;
 290                         READMEM(buf, dummy32);
 291                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 292                         status = nfs_ok;
 293                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 294                                 ace->who = 0;
 295                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 296                                 status = nfsd_map_name_to_gid(argp->rqstp,
 297                                                 buf, dummy32, &ace->who);
 298                         else
 299                                 status = nfsd_map_name_to_uid(argp->rqstp,
 300                                                 buf, dummy32, &ace->who);
 301                         if (status)
 302                                 return status;
 303                 }
 304         } else
 305                 *acl = NULL;
 306         if (bmval[1] & FATTR4_WORD1_MODE) {
 307                 READ_BUF(4);
 308                 len += 4;
 309                 READ32(iattr->ia_mode);
 310                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 311                 iattr->ia_valid |= ATTR_MODE;
 312         }
 313         if (bmval[1] & FATTR4_WORD1_OWNER) {
 314                 READ_BUF(4);
 315                 len += 4;
 316                 READ32(dummy32);
 317                 READ_BUF(dummy32);
 318                 len += (XDR_QUADLEN(dummy32) << 2);
 319                 READMEM(buf, dummy32);
 320                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 321                         goto out_nfserr;
 322                 iattr->ia_valid |= ATTR_UID;
 323         }
 324         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 325                 READ_BUF(4);
 326                 len += 4;
 327                 READ32(dummy32);
 328                 READ_BUF(dummy32);
 329                 len += (XDR_QUADLEN(dummy32) << 2);
 330                 READMEM(buf, dummy32);
 331                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 332                         goto out_nfserr;
 333                 iattr->ia_valid |= ATTR_GID;
 334         }
 335         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 336                 READ_BUF(4);
 337                 len += 4;
 338                 READ32(dummy32);
 339                 switch (dummy32) {
 340                 case NFS4_SET_TO_CLIENT_TIME:
 341                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 342                            all 32 bits of 'nseconds'. */
 343                         READ_BUF(12);
 344                         len += 12;
 345                         READ32(dummy32);
 346                         if (dummy32)
 347                                 return nfserr_inval;
 348                         READ32(iattr->ia_atime.tv_sec);
 349                         READ32(iattr->ia_atime.tv_nsec);
 350                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 351                                 return nfserr_inval;
 352                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 353                         break;
 354                 case NFS4_SET_TO_SERVER_TIME:
 355                         iattr->ia_valid |= ATTR_ATIME;
 356                         break;
 357                 default:
 358                         goto xdr_error;
 359                 }
 360         }
 361         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 362                 READ_BUF(4);
 363                 len += 4;
 364                 READ32(dummy32);
 365                 switch (dummy32) {
 366                 case NFS4_SET_TO_CLIENT_TIME:
 367                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 368                            all 32 bits of 'nseconds'. */
 369                         READ_BUF(12);
 370                         len += 12;
 371                         READ32(dummy32);
 372                         if (dummy32)
 373                                 return nfserr_inval;
 374                         READ32(iattr->ia_mtime.tv_sec);
 375                         READ32(iattr->ia_mtime.tv_nsec);
 376                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 377                                 return nfserr_inval;
 378                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 379                         break;
 380                 case NFS4_SET_TO_SERVER_TIME:
 381                         iattr->ia_valid |= ATTR_MTIME;
 382                         break;
 383                 default:
 384                         goto xdr_error;
 385                 }
 386         }
 387         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 388             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 389             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 390                 READ_BUF(expected_len - len);
 391         else if (len != expected_len)
 392                 goto xdr_error;
 393
 394         DECODE_TAIL;
 395
 396 out_nfserr:
 397         status = nfserrno(host_err);
 398         goto out;
 399 }
 400
 401 static __be32
 402 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 403 {
 404         DECODE_HEAD;
 405
 406         READ_BUF(sizeof(stateid_t));
 407         READ32(sid->si_generation);
 408         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 409
 410         DECODE_TAIL;
 411 }
 412
 413 static __be32
 414 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 415 {
 416         DECODE_HEAD;
 417
 418         READ_BUF(4);
 419         READ32(access->ac_req_access);
 420
 421         DECODE_TAIL;
 422 }
 423
 424 static __be32
 425 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 426 {
 427         DECODE_HEAD;
 428
 429         close->cl_stateowner = NULL;
 430         READ_BUF(4);
 431         READ32(close->cl_seqid);
 432         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 433
 434         DECODE_TAIL;
 435 }
 436
 437
 438 static __be32
 439 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 440 {
 441         DECODE_HEAD;
 442
 443         READ_BUF(12);
 444         READ64(commit->co_offset);
 445         READ32(commit->co_count);
 446
 447         DECODE_TAIL;
 448 }
 449
 450 static __be32
 451 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 452 {
 453         DECODE_HEAD;
 454
 455         READ_BUF(4);
 456         READ32(create->cr_type);
 457         switch (create->cr_type) {
 458         case NF4LNK:
 459                 READ_BUF(4);
 460                 READ32(create->cr_linklen);
 461                 READ_BUF(create->cr_linklen);
 462                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 463                 break;
 464         case NF4BLK:
 465         case NF4CHR:
 466                 READ_BUF(8);
 467                 READ32(create->cr_specdata1);
 468                 READ32(create->cr_specdata2);
 469                 break;
 470         case NF4SOCK:
 471         case NF4FIFO:
 472         case NF4DIR:
 473         default:
 474                 break;
 475         }
 476
 477         READ_BUF(4);
 478         READ32(create->cr_namelen);
 479         READ_BUF(create->cr_namelen);
 480         SAVEMEM(create->cr_name, create->cr_namelen);
 481         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 482                 return status;
 483
 484         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 485                                     &create->cr_acl);
 486         if (status)
 487                 goto out;
 488
 489         DECODE_TAIL;
 490 }
 491
 492 static inline __be32
 493 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 494 {
 495         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 496 }
 497
 498 static inline __be32
 499 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 500 {
 501         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 502 }
 503
 504 static __be32
 505 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 506 {
 507         DECODE_HEAD;
 508
 509         READ_BUF(4);
 510         READ32(link->li_namelen);
 511         READ_BUF(link->li_namelen);
 512         SAVEMEM(link->li_name, link->li_namelen);
 513         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 514                 return status;
 515
 516         DECODE_TAIL;
 517 }
 518
 519 static __be32
 520 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 521 {
 522         DECODE_HEAD;
 523
 524         lock->lk_replay_owner = NULL;
 525         /*
 526         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 527         */
 528         READ_BUF(28);
 529         READ32(lock->lk_type);
 530         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 531                 goto xdr_error;
 532         READ32(lock->lk_reclaim);
 533         READ64(lock->lk_offset);
 534         READ64(lock->lk_length);
 535         READ32(lock->lk_is_new);
 536
 537         if (lock->lk_is_new) {
 538                 READ_BUF(4);
 539                 READ32(lock->lk_new_open_seqid);
 540                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 541                 if (status)
 542                         return status;
 543                 READ_BUF(8 + sizeof(clientid_t));
 544                 READ32(lock->lk_new_lock_seqid);
 545                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 546                 READ32(lock->lk_new_owner.len);
 547                 READ_BUF(lock->lk_new_owner.len);
 548                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 549         } else {
 550                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 551                 if (status)
 552                         return status;
 553                 READ_BUF(4);
 554                 READ32(lock->lk_old_lock_seqid);
 555         }
 556
 557         DECODE_TAIL;
 558 }
 559
 560 static __be32
 561 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 562 {
 563         DECODE_HEAD;
 564
 565         READ_BUF(32);
 566         READ32(lockt->lt_type);
 567         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 568                 goto xdr_error;
 569         READ64(lockt->lt_offset);
 570         READ64(lockt->lt_length);
 571         COPYMEM(&lockt->lt_clientid, 8);
 572         READ32(lockt->lt_owner.len);
 573         READ_BUF(lockt->lt_owner.len);
 574         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 575
 576         if (argp->minorversion && !zero_clientid(&lockt->lt_clientid))
 577                 return nfserr_inval;
 578         DECODE_TAIL;
 579 }
 580
 581 static __be32
 582 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 583 {
 584         DECODE_HEAD;
 585
 586         locku->lu_stateowner = NULL;
 587         READ_BUF(8);
 588         READ32(locku->lu_type);
 589         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 590                 goto xdr_error;
 591         READ32(locku->lu_seqid);
 592         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 593         if (status)
 594                 return status;
 595         READ_BUF(16);
 596         READ64(locku->lu_offset);
 597         READ64(locku->lu_length);
 598
 599         DECODE_TAIL;
 600 }
 601
 602 static __be32
 603 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 604 {
 605         DECODE_HEAD;
 606
 607         READ_BUF(4);
 608         READ32(lookup->lo_len);
 609         READ_BUF(lookup->lo_len);
 610         SAVEMEM(lookup->lo_name, lookup->lo_len);
 611         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 612                 return status;
 613
 614         DECODE_TAIL;
 615 }
 616
 617 static __be32
 618 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 619 {
 620         DECODE_HEAD;
 621
 622         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 623         open->op_iattr.ia_valid = 0;
 624         open->op_stateowner = NULL;
 625
 626         /* seqid, share_access, share_deny, clientid, ownerlen */
 627         READ_BUF(16 + sizeof(clientid_t));
 628         READ32(open->op_seqid);
 629         READ32(open->op_share_access);
 630         READ32(open->op_share_deny);
 631         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 632         READ32(open->op_owner.len);
 633
 634         /* owner, open_flag */
 635         READ_BUF(open->op_owner.len + 4);
 636         SAVEMEM(open->op_owner.data, open->op_owner.len);
 637         READ32(open->op_create);
 638         switch (open->op_create) {
 639         case NFS4_OPEN_NOCREATE:
 640                 break;
 641         case NFS4_OPEN_CREATE:
 642                 READ_BUF(4);
 643                 READ32(open->op_createmode);
 644                 switch (open->op_createmode) {
 645                 case NFS4_CREATE_UNCHECKED:
 646                 case NFS4_CREATE_GUARDED:
 647                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 648                                 &open->op_iattr, &open->op_acl);
 649                         if (status)
 650                                 goto out;
 651                         break;
 652                 case NFS4_CREATE_EXCLUSIVE:
 653                         READ_BUF(8);
 654                         COPYMEM(open->op_verf.data, 8);
 655                         break;
 656                 case NFS4_CREATE_EXCLUSIVE4_1:
 657                         if (argp->minorversion < 1)
 658                                 goto xdr_error;
 659                         READ_BUF(8);
 660                         COPYMEM(open->op_verf.data, 8);
 661                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 662                                 &open->op_iattr, &open->op_acl);
 663                         if (status)
 664                                 goto out;
 665                         break;
 666                 default:
 667                         goto xdr_error;
 668                 }
 669                 break;
 670         default:
 671                 goto xdr_error;
 672         }
 673
 674         /* open_claim */
 675         READ_BUF(4);
 676         READ32(open->op_claim_type);
 677         switch (open->op_claim_type) {
 678         case NFS4_OPEN_CLAIM_NULL:
 679         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 680                 READ_BUF(4);
 681                 READ32(open->op_fname.len);
 682                 READ_BUF(open->op_fname.len);
 683                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 684                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 685                         return status;
 686                 break;
 687         case NFS4_OPEN_CLAIM_PREVIOUS:
 688                 READ_BUF(4);
 689                 READ32(open->op_delegate_type);
 690                 break;
 691         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 692                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 693                 if (status)
 694                         return status;
 695                 READ_BUF(4);
 696                 READ32(open->op_fname.len);
 697                 READ_BUF(open->op_fname.len);
 698                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 699                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 700                         return status;
 701                 break;
 702         default:
 703                 goto xdr_error;
 704         }
 705
 706         DECODE_TAIL;
 707 }
 708
 709 static __be32
 710 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 711 {
 712         DECODE_HEAD;
 713
 714         open_conf->oc_stateowner = NULL;
 715         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 716         if (status)
 717                 return status;
 718         READ_BUF(4);
 719         READ32(open_conf->oc_seqid);
 720
 721         DECODE_TAIL;
 722 }
 723
 724 static __be32
 725 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 726 {
 727         DECODE_HEAD;
 728
 729         open_down->od_stateowner = NULL;
 730         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 731         if (status)
 732                 return status;
 733         READ_BUF(12);
 734         READ32(open_down->od_seqid);
 735         READ32(open_down->od_share_access);
 736         READ32(open_down->od_share_deny);
 737
 738         DECODE_TAIL;
 739 }
 740
 741 static __be32
 742 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 743 {
 744         DECODE_HEAD;
 745
 746         READ_BUF(4);
 747         READ32(putfh->pf_fhlen);
 748         if (putfh->pf_fhlen > NFS4_FHSIZE)
 749                 goto xdr_error;
 750         READ_BUF(putfh->pf_fhlen);
 751         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 752
 753         DECODE_TAIL;
 754 }
 755
 756 static __be32
 757 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 758 {
 759         DECODE_HEAD;
 760
 761         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 762         if (status)
 763                 return status;
 764         READ_BUF(12);
 765         READ64(read->rd_offset);
 766         READ32(read->rd_length);
 767
 768         DECODE_TAIL;
 769 }
 770
 771 static __be32
 772 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 773 {
 774         DECODE_HEAD;
 775
 776         READ_BUF(24);
 777         READ64(readdir->rd_cookie);
 778         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 779         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 780         READ32(readdir->rd_maxcount);
 781         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 782                 goto out;
 783
 784         DECODE_TAIL;
 785 }
 786
 787 static __be32
 788 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 789 {
 790         DECODE_HEAD;
 791
 792         READ_BUF(4);
 793         READ32(remove->rm_namelen);
 794         READ_BUF(remove->rm_namelen);
 795         SAVEMEM(remove->rm_name, remove->rm_namelen);
 796         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 797                 return status;
 798
 799         DECODE_TAIL;
 800 }
 801
 802 static __be32
 803 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 804 {
 805         DECODE_HEAD;
 806
 807         READ_BUF(4);
 808         READ32(rename->rn_snamelen);
 809         READ_BUF(rename->rn_snamelen + 4);
 810         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 811         READ32(rename->rn_tnamelen);
 812         READ_BUF(rename->rn_tnamelen);
 813         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 814         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 815                 return status;
 816         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 817                 return status;
 818
 819         DECODE_TAIL;
 820 }
 821
 822 static __be32
 823 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 824 {
 825         DECODE_HEAD;
 826
 827         READ_BUF(sizeof(clientid_t));
 828         COPYMEM(clientid, sizeof(clientid_t));
 829
 830         DECODE_TAIL;
 831 }
 832
 833 static __be32
 834 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 835                      struct nfsd4_secinfo *secinfo)
 836 {
 837         DECODE_HEAD;
 838
 839         READ_BUF(4);
 840         READ32(secinfo->si_namelen);
 841         READ_BUF(secinfo->si_namelen);
 842         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 843         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 844                                                                 nfserr_noent);
 845         if (status)
 846                 return status;
 847         DECODE_TAIL;
 848 }
 849
 850 static __be32
 851 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
 852                      struct nfsd4_secinfo_no_name *sin)
 853 {
 854         DECODE_HEAD;
 855
 856         READ_BUF(4);
 857         READ32(sin->sin_style);
 858         DECODE_TAIL;
 859 }
 860
 861 static __be32
 862 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 863 {
 864         __be32 status;
 865
 866         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 867         if (status)
 868                 return status;
 869         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 870                                   &setattr->sa_acl);
 871 }
 872
 873 static __be32
 874 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 875 {
 876         DECODE_HEAD;
 877
 878         READ_BUF(12);
 879         COPYMEM(setclientid->se_verf.data, 8);
 880         READ32(setclientid->se_namelen);
 881
 882         READ_BUF(setclientid->se_namelen + 8);
 883         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 884         READ32(setclientid->se_callback_prog);
 885         READ32(setclientid->se_callback_netid_len);
 886
 887         READ_BUF(setclientid->se_callback_netid_len + 4);
 888         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 889         READ32(setclientid->se_callback_addr_len);
 890
 891         READ_BUF(setclientid->se_callback_addr_len + 4);
 892         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 893         READ32(setclientid->se_callback_ident);
 894
 895         DECODE_TAIL;
 896 }
 897
 898 static __be32
 899 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 900 {
 901         DECODE_HEAD;
 902
 903         READ_BUF(8 + sizeof(nfs4_verifier));
 904         COPYMEM(&scd_c->sc_clientid, 8);
 905         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 906
 907         DECODE_TAIL;
 908 }
 909
 910 /* Also used for NVERIFY */
 911 static __be32
 912 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 913 {
 914 #if 0
 915         struct nfsd4_compoundargs save = {
 916                 .p = argp->p,
 917                 .end = argp->end,
 918                 .rqstp = argp->rqstp,
 919         };
 920         u32             ve_bmval[2];
 921         struct iattr    ve_iattr;           /* request */
 922         struct nfs4_acl *ve_acl;            /* request */
 923 #endif
 924         DECODE_HEAD;
 925
 926         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 927                 goto out;
 928
 929         /* For convenience's sake, we compare raw xdr'd attributes in
 930          * nfsd4_proc_verify; however we still decode here just to return
 931          * correct error in case of bad xdr. */
 932 #if 0
 933         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 934         if (status == nfserr_inval) {
 935                 status = nfserrno(status);
 936                 goto out;
 937         }
 938 #endif
 939         READ_BUF(4);
 940         READ32(verify->ve_attrlen);
 941         READ_BUF(verify->ve_attrlen);
 942         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 943
 944         DECODE_TAIL;
 945 }
 946
 947 static __be32
 948 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 949 {
 950         int avail;
 951         int v;
 952         int len;
 953         DECODE_HEAD;
 954
 955         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
 956         if (status)
 957                 return status;
 958         READ_BUF(16);
 959         READ64(write->wr_offset);
 960         READ32(write->wr_stable_how);
 961         if (write->wr_stable_how > 2)
 962                 goto xdr_error;
 963         READ32(write->wr_buflen);
 964
 965         /* Sorry .. no magic macros for this.. *
 966          * READ_BUF(write->wr_buflen);
 967          * SAVEMEM(write->wr_buf, write->wr_buflen);
 968          */
 969         avail = (char*)argp->end - (char*)argp->p;
 970         if (avail + argp->pagelen < write->wr_buflen) {
 971                 dprintk("NFSD: xdr error (%s:%d)\n",
 972                                 __FILE__, __LINE__);
 973                 goto xdr_error;
 974         }
 975         argp->rqstp->rq_vec[0].iov_base = p;
 976         argp->rqstp->rq_vec[0].iov_len = avail;
 977         v = 0;
 978         len = write->wr_buflen;
 979         while (len > argp->rqstp->rq_vec[v].iov_len) {
 980                 len -= argp->rqstp->rq_vec[v].iov_len;
 981                 v++;
 982                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 983                 argp->pagelist++;
 984                 if (argp->pagelen >= PAGE_SIZE) {
 985                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 986                         argp->pagelen -= PAGE_SIZE;
 987                 } else {
 988                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 989                         argp->pagelen -= len;
 990                 }
 991         }
 992         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 993         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 994         argp->rqstp->rq_vec[v].iov_len = len;
 995         write->wr_vlen = v+1;
 996
 997         DECODE_TAIL;
 998 }
 999
1000 static __be32
1001 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1002 {
1003         DECODE_HEAD;
1004
1005         READ_BUF(12);
1006         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1007         READ32(rlockowner->rl_owner.len);
1008         READ_BUF(rlockowner->rl_owner.len);
1009         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1010
1011         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1012                 return nfserr_inval;
1013         DECODE_TAIL;
1014 }
1015
1016 static __be32
1017 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1018                          struct nfsd4_exchange_id *exid)
1019 {
1020         int dummy, tmp;
1021         DECODE_HEAD;
1022
1023         READ_BUF(NFS4_VERIFIER_SIZE);
1024         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1025
1026         READ_BUF(4);
1027         READ32(exid->clname.len);
1028
1029         READ_BUF(exid->clname.len);
1030         SAVEMEM(exid->clname.data, exid->clname.len);
1031
1032         READ_BUF(4);
1033         READ32(exid->flags);
1034
1035         /* Ignore state_protect4_a */
1036         READ_BUF(4);
1037         READ32(exid->spa_how);
1038         switch (exid->spa_how) {
1039         case SP4_NONE:
1040                 break;
1041         case SP4_MACH_CRED:
1042                 /* spo_must_enforce */
1043                 READ_BUF(4);
1044                 READ32(dummy);
1045                 READ_BUF(dummy * 4);
1046                 p += dummy;
1047
1048                 /* spo_must_allow */
1049                 READ_BUF(4);
1050                 READ32(dummy);
1051                 READ_BUF(dummy * 4);
1052                 p += dummy;
1053                 break;
1054         case SP4_SSV:
1055                 /* ssp_ops */
1056                 READ_BUF(4);
1057                 READ32(dummy);
1058                 READ_BUF(dummy * 4);
1059                 p += dummy;
1060
1061                 READ_BUF(4);
1062                 READ32(dummy);
1063                 READ_BUF(dummy * 4);
1064                 p += dummy;
1065
1066                 /* ssp_hash_algs<> */
1067                 READ_BUF(4);
1068                 READ32(tmp);
1069                 while (tmp--) {
1070                         READ_BUF(4);
1071                         READ32(dummy);
1072                         READ_BUF(dummy);
1073                         p += XDR_QUADLEN(dummy);
1074                 }
1075
1076                 /* ssp_encr_algs<> */
1077                 READ_BUF(4);
1078                 READ32(tmp);
1079                 while (tmp--) {
1080                         READ_BUF(4);
1081                         READ32(dummy);
1082                         READ_BUF(dummy);
1083                         p += XDR_QUADLEN(dummy);
1084                 }
1085
1086                 /* ssp_window and ssp_num_gss_handles */
1087                 READ_BUF(8);
1088                 READ32(dummy);
1089                 READ32(dummy);
1090                 break;
1091         default:
1092                 goto xdr_error;
1093         }
1094
1095         /* Ignore Implementation ID */
1096         READ_BUF(4);    /* nfs_impl_id4 array length */
1097         READ32(dummy);
1098
1099         if (dummy > 1)
1100                 goto xdr_error;
1101
1102         if (dummy == 1) {
1103                 /* nii_domain */
1104                 READ_BUF(4);
1105                 READ32(dummy);
1106                 READ_BUF(dummy);
1107                 p += XDR_QUADLEN(dummy);
1108
1109                 /* nii_name */
1110                 READ_BUF(4);
1111                 READ32(dummy);
1112                 READ_BUF(dummy);
1113                 p += XDR_QUADLEN(dummy);
1114
1115                 /* nii_date */
1116                 READ_BUF(12);
1117                 p += 3;
1118         }
1119         DECODE_TAIL;
1120 }
1121
1122 static __be32
1123 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1124                             struct nfsd4_create_session *sess)
1125 {
1126         DECODE_HEAD;
1127
1128         u32 dummy;
1129         char *machine_name;
1130         int i;
1131         int nr_secflavs;
1132
1133         READ_BUF(16);
1134         COPYMEM(&sess->clientid, 8);
1135         READ32(sess->seqid);
1136         READ32(sess->flags);
1137
1138         /* Fore channel attrs */
1139         READ_BUF(28);
1140         READ32(dummy); /* headerpadsz is always 0 */
1141         READ32(sess->fore_channel.maxreq_sz);
1142         READ32(sess->fore_channel.maxresp_sz);
1143         READ32(sess->fore_channel.maxresp_cached);
1144         READ32(sess->fore_channel.maxops);
1145         READ32(sess->fore_channel.maxreqs);
1146         READ32(sess->fore_channel.nr_rdma_attrs);
1147         if (sess->fore_channel.nr_rdma_attrs == 1) {
1148                 READ_BUF(4);
1149                 READ32(sess->fore_channel.rdma_attrs);
1150         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1151                 dprintk("Too many fore channel attr bitmaps!\n");
1152                 goto xdr_error;
1153         }
1154
1155         /* Back channel attrs */
1156         READ_BUF(28);
1157         READ32(dummy); /* headerpadsz is always 0 */
1158         READ32(sess->back_channel.maxreq_sz);
1159         READ32(sess->back_channel.maxresp_sz);
1160         READ32(sess->back_channel.maxresp_cached);
1161         READ32(sess->back_channel.maxops);
1162         READ32(sess->back_channel.maxreqs);
1163         READ32(sess->back_channel.nr_rdma_attrs);
1164         if (sess->back_channel.nr_rdma_attrs == 1) {
1165                 READ_BUF(4);
1166                 READ32(sess->back_channel.rdma_attrs);
1167         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1168                 dprintk("Too many back channel attr bitmaps!\n");
1169                 goto xdr_error;
1170         }
1171
1172         READ_BUF(8);
1173         READ32(sess->callback_prog);
1174
1175         /* callback_sec_params4 */
1176         READ32(nr_secflavs);
1177         for (i = 0; i < nr_secflavs; ++i) {
1178                 READ_BUF(4);
1179                 READ32(dummy);
1180                 switch (dummy) {
1181                 case RPC_AUTH_NULL:
1182                         /* Nothing to read */
1183                         break;
1184                 case RPC_AUTH_UNIX:
1185                         READ_BUF(8);
1186                         /* stamp */
1187                         READ32(dummy);
1188
1189                         /* machine name */
1190                         READ32(dummy);
1191                         READ_BUF(dummy);
1192                         SAVEMEM(machine_name, dummy);
1193
1194                         /* uid, gid */
1195                         READ_BUF(8);
1196                         READ32(sess->uid);
1197                         READ32(sess->gid);
1198
1199                         /* more gids */
1200                         READ_BUF(4);
1201                         READ32(dummy);
1202                         READ_BUF(dummy * 4);
1203                         for (i = 0; i < dummy; ++i)
1204                                 READ32(dummy);
1205                         break;
1206                 case RPC_AUTH_GSS:
1207                         dprintk("RPC_AUTH_GSS callback secflavor "
1208                                 "not supported!\n");
1209                         READ_BUF(8);
1210                         /* gcbp_service */
1211                         READ32(dummy);
1212                         /* gcbp_handle_from_server */
1213                         READ32(dummy);
1214                         READ_BUF(dummy);
1215                         p += XDR_QUADLEN(dummy);
1216                         /* gcbp_handle_from_client */
1217                         READ_BUF(4);
1218                         READ32(dummy);
1219                         READ_BUF(dummy);
1220                         p += XDR_QUADLEN(dummy);
1221                         break;
1222                 default:
1223                         dprintk("Illegal callback secflavor\n");
1224                         return nfserr_inval;
1225                 }
1226         }
1227         DECODE_TAIL;
1228 }
1229
1230 static __be32
1231 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1232                              struct nfsd4_destroy_session *destroy_session)
1233 {
1234         DECODE_HEAD;
1235         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1236         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1237
1238         DECODE_TAIL;
1239 }
1240
1241 static __be32
1242 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1243                       struct nfsd4_sequence *seq)
1244 {
1245         DECODE_HEAD;
1246
1247         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1248         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1249         READ32(seq->seqid);
1250         READ32(seq->slotid);
1251         READ32(seq->maxslots);
1252         READ32(seq->cachethis);
1253
1254         DECODE_TAIL;
1255 }
1256
1257 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1258 {
1259         DECODE_HEAD;
1260
1261         READ_BUF(4);
1262         READ32(rc->rca_one_fs);
1263
1264         DECODE_TAIL;
1265 }
1266
1267 static __be32
1268 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1269 {
1270         return nfs_ok;
1271 }
1272
1273 static __be32
1274 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1275 {
1276         return nfserr_notsupp;
1277 }
1278
1279 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1280
1281 static nfsd4_dec nfsd4_dec_ops[] = {
1282         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1283         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1284         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1285         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1286         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1287         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1288         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1289         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1290         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1291         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1292         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1293         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1294         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1295         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1296         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1297         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1298         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1299         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1300         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1301         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1302         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1303         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1304         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1305         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1306         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1307         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1308         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1309         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1310         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1311         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1312         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1313         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1314         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1315         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1316         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1317         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1318         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1319 };
1320
1321 static nfsd4_dec nfsd41_dec_ops[] = {
1322         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1323         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1324         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1325         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1326         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1327         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1328         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1329         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1330         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1331         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1332         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1333         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1334         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1335         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1336         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1337         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1338         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1339         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1340         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1341         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1342         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1343         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1344         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1345         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1346         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1347         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1348         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1349         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1350         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1351         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1352         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1353         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1354         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1355         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1356         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1357         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1358         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1359
1360         /* new operations for NFSv4.1 */
1361         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1362         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_notsupp,
1363         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1364         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1365         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1366         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1367         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1368         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1369         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1370         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1371         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1372         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1373         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1374         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1375         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1376         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1377         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1378         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_notsupp,
1379         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1380 };
1381
1382 struct nfsd4_minorversion_ops {
1383         nfsd4_dec *decoders;
1384         int nops;
1385 };
1386
1387 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1388         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1389         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1390 };
1391
1392 static __be32
1393 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1394 {
1395         DECODE_HEAD;
1396         struct nfsd4_op *op;
1397         struct nfsd4_minorversion_ops *ops;
1398         int i;
1399
1400         /*
1401          * XXX: According to spec, we should check the tag
1402          * for UTF-8 compliance.  I'm postponing this for
1403          * now because it seems that some clients do use
1404          * binary tags.
1405          */
1406         READ_BUF(4);
1407         READ32(argp->taglen);
1408         READ_BUF(argp->taglen + 8);
1409         SAVEMEM(argp->tag, argp->taglen);
1410         READ32(argp->minorversion);
1411         READ32(argp->opcnt);
1412
1413         if (argp->taglen > NFSD4_MAX_TAGLEN)
1414                 goto xdr_error;
1415         if (argp->opcnt > 100)
1416                 goto xdr_error;
1417
1418         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1419                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1420                 if (!argp->ops) {
1421                         argp->ops = argp->iops;
1422                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1423                         goto xdr_error;
1424                 }
1425         }
1426
1427         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1428                 argp->opcnt = 0;
1429
1430         ops = &nfsd4_minorversion[argp->minorversion];
1431         for (i = 0; i < argp->opcnt; i++) {
1432                 op = &argp->ops[i];
1433                 op->replay = NULL;
1434
1435                 /*
1436                  * We can't use READ_BUF() here because we need to handle
1437                  * a missing opcode as an OP_WRITE + 1. So we need to check
1438                  * to see if we're truly at the end of our buffer or if there
1439                  * is another page we need to flip to.
1440                  */
1441
1442                 if (argp->p == argp->end) {
1443                         if (argp->pagelen < 4) {
1444                                 /* There isn't an opcode still on the wire */
1445                                 op->opnum = OP_WRITE + 1;
1446                                 op->status = nfserr_bad_xdr;
1447                                 argp->opcnt = i+1;
1448                                 break;
1449                         }
1450
1451                         /*
1452                          * False alarm. We just hit a page boundary, but there
1453                          * is still data available.  Move pointer across page
1454                          * boundary.  *snip from READ_BUF*
1455                          */
1456                         argp->p = page_address(argp->pagelist[0]);
1457                         argp->pagelist++;
1458                         if (argp->pagelen < PAGE_SIZE) {
1459                                 argp->end = argp->p + (argp->pagelen>>2);
1460                                 argp->pagelen = 0;
1461                         } else {
1462                                 argp->end = argp->p + (PAGE_SIZE>>2);
1463                                 argp->pagelen -= PAGE_SIZE;
1464                         }
1465                 }
1466                 op->opnum = ntohl(*argp->p++);
1467
1468                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1469                         op->status = ops->decoders[op->opnum](argp, &op->u);
1470                 else {
1471                         op->opnum = OP_ILLEGAL;
1472                         op->status = nfserr_op_illegal;
1473                 }
1474
1475                 if (op->status) {
1476                         argp->opcnt = i+1;
1477                         break;
1478                 }
1479         }
1480
1481         DECODE_TAIL;
1482 }
1483
1484 #define WRITE32(n)               *p++ = htonl(n)
1485 #define WRITE64(n)               do {                           \
1486         *p++ = htonl((u32)((n) >> 32));                         \
1487         *p++ = htonl((u32)(n));                                 \
1488 } while (0)
1489 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1490         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1491         memcpy(p, ptr, nbytes);                                 \
1492         p += XDR_QUADLEN(nbytes);                               \
1493 }} while (0)
1494
1495 static void write32(__be32 **p, u32 n)
1496 {
1497         *(*p)++ = n;
1498 }
1499
1500 static void write64(__be32 **p, u64 n)
1501 {
1502         write32(p, (u32)(n >> 32));
1503         write32(p, (u32)n);
1504 }
1505
1506 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1507 {
1508         if (IS_I_VERSION(inode)) {
1509                 write64(p, inode->i_version);
1510         } else {
1511                 write32(p, stat->ctime.tv_sec);
1512                 write32(p, stat->ctime.tv_nsec);
1513         }
1514 }
1515
1516 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1517 {
1518         write32(p, c->atomic);
1519         if (c->change_supported) {
1520                 write64(p, c->before_change);
1521                 write64(p, c->after_change);
1522         } else {
1523                 write32(p, c->before_ctime_sec);
1524                 write32(p, c->before_ctime_nsec);
1525                 write32(p, c->after_ctime_sec);
1526                 write32(p, c->after_ctime_nsec);
1527         }
1528 }
1529
1530 #define RESERVE_SPACE(nbytes)   do {                            \
1531         p = resp->p;                                            \
1532         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1533 } while (0)
1534 #define ADJUST_ARGS()           resp->p = p
1535
1536 /*
1537  * Header routine to setup seqid operation replay cache
1538  */
1539 #define ENCODE_SEQID_OP_HEAD                                    \
1540         __be32 *save;                                           \
1541                                                                 \
1542         save = resp->p;
1543
1544 /*
1545  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1546  * is where sequence id's are incremented, and the replay cache is filled.
1547  * Note that we increment sequence id's here, at the last moment, so we're sure
1548  * we know whether the error to be returned is a sequence id mutating error.
1549  */
1550
1551 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1552         if (seqid_mutating_err(nfserr) && stateowner) {         \
1553                 stateowner->so_seqid++;                         \
1554                 stateowner->so_replay.rp_status = nfserr;       \
1555                 stateowner->so_replay.rp_buflen =               \
1556                           (((char *)(resp)->p - (char *)save)); \
1557                 memcpy(stateowner->so_replay.rp_buf, save,      \
1558                         stateowner->so_replay.rp_buflen);       \
1559         } } while (0);
1560
1561 /* Encode as an array of strings the string given with components
1562  * separated @sep.
1563  */
1564 static __be32 nfsd4_encode_components(char sep, char *components,
1565                                    __be32 **pp, int *buflen)
1566 {
1567         __be32 *p = *pp;
1568         __be32 *countp = p;
1569         int strlen, count=0;
1570         char *str, *end;
1571
1572         dprintk("nfsd4_encode_components(%s)\n", components);
1573         if ((*buflen -= 4) < 0)
1574                 return nfserr_resource;
1575         WRITE32(0); /* We will fill this in with @count later */
1576         end = str = components;
1577         while (*end) {
1578                 for (; *end && (*end != sep); end++)
1579                         ; /* Point to end of component */
1580                 strlen = end - str;
1581                 if (strlen) {
1582                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1583                                 return nfserr_resource;
1584                         WRITE32(strlen);
1585                         WRITEMEM(str, strlen);
1586                         count++;
1587                 }
1588                 else
1589                         end++;
1590                 str = end;
1591         }
1592         *pp = p;
1593         p = countp;
1594         WRITE32(count);
1595         return 0;
1596 }
1597
1598 /*
1599  * encode a location element of a fs_locations structure
1600  */
1601 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1602                                     __be32 **pp, int *buflen)
1603 {
1604         __be32 status;
1605         __be32 *p = *pp;
1606
1607         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1608         if (status)
1609                 return status;
1610         status = nfsd4_encode_components('/', location->path, &p, buflen);
1611         if (status)
1612                 return status;
1613         *pp = p;
1614         return 0;
1615 }
1616
1617 /*
1618  * Return the path to an export point in the pseudo filesystem namespace
1619  * Returned string is safe to use as long as the caller holds a reference
1620  * to @exp.
1621  */
1622 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1623 {
1624         struct svc_fh tmp_fh;
1625         char *path = NULL, *rootpath;
1626         size_t rootlen;
1627
1628         fh_init(&tmp_fh, NFS4_FHSIZE);
1629         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1630         if (*stat)
1631                 return NULL;
1632         rootpath = tmp_fh.fh_export->ex_pathname;
1633
1634         path = exp->ex_pathname;
1635
1636         rootlen = strlen(rootpath);
1637         if (strncmp(path, rootpath, rootlen)) {
1638                 dprintk("nfsd: fs_locations failed;"
1639                         "%s is not contained in %s\n", path, rootpath);
1640                 *stat = nfserr_notsupp;
1641                 path = NULL;
1642                 goto out;
1643         }
1644         path += rootlen;
1645 out:
1646         fh_put(&tmp_fh);
1647         return path;
1648 }
1649
1650 /*
1651  *  encode a fs_locations structure
1652  */
1653 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1654                                      struct svc_export *exp,
1655                                      __be32 **pp, int *buflen)
1656 {
1657         __be32 status;
1658         int i;
1659         __be32 *p = *pp;
1660         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1661         char *root = nfsd4_path(rqstp, exp, &status);
1662
1663         if (status)
1664                 return status;
1665         status = nfsd4_encode_components('/', root, &p, buflen);
1666         if (status)
1667                 return status;
1668         if ((*buflen -= 4) < 0)
1669                 return nfserr_resource;
1670         WRITE32(fslocs->locations_count);
1671         for (i=0; i<fslocs->locations_count; i++) {
1672                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1673                                                    &p, buflen);
1674                 if (status)
1675                         return status;
1676         }
1677         *pp = p;
1678         return 0;
1679 }
1680
1681 static u32 nfs4_ftypes[16] = {
1682         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1683         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1684         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1685         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1686 };
1687
1688 static __be32
1689 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1690                         __be32 **p, int *buflen)
1691 {
1692         int status;
1693
1694         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1695                 return nfserr_resource;
1696         if (whotype != NFS4_ACL_WHO_NAMED)
1697                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1698         else if (group)
1699                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1700         else
1701                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1702         if (status < 0)
1703                 return nfserrno(status);
1704         *p = xdr_encode_opaque(*p, NULL, status);
1705         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1706         BUG_ON(*buflen < 0);
1707         return 0;
1708 }
1709
1710 static inline __be32
1711 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1712 {
1713         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1714 }
1715
1716 static inline __be32
1717 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1718 {
1719         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1720 }
1721
1722 static inline __be32
1723 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1724                 __be32 **p, int *buflen)
1725 {
1726         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1727 }
1728
1729 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1730                               FATTR4_WORD0_RDATTR_ERROR)
1731 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1732
1733 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1734 {
1735         /* As per referral draft:  */
1736         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1737             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1738                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1739                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1740                         *rdattr_err = NFSERR_MOVED;
1741                 else
1742                         return nfserr_moved;
1743         }
1744         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1745         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1746         return 0;
1747 }
1748
1749 /*
1750  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1751  * ourselves.
1752  *
1753  * @countp is the buffer size in _words_; upon successful return this becomes
1754  * replaced with the number of words written.
1755  */
1756 __be32
1757 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1758                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1759                 struct svc_rqst *rqstp, int ignore_crossmnt)
1760 {
1761         u32 bmval0 = bmval[0];
1762         u32 bmval1 = bmval[1];
1763         u32 bmval2 = bmval[2];
1764         struct kstat stat;
1765         struct svc_fh tempfh;
1766         struct kstatfs statfs;
1767         int buflen = *countp << 2;
1768         __be32 *attrlenp;
1769         u32 dummy;
1770         u64 dummy64;
1771         u32 rdattr_err = 0;
1772         __be32 *p = buffer;
1773         __be32 status;
1774         int err;
1775         int aclsupport = 0;
1776         struct nfs4_acl *acl = NULL;
1777         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1778         u32 minorversion = resp->cstate.minorversion;
1779         struct path path = {
1780                 .mnt    = exp->ex_path.mnt,
1781                 .dentry = dentry,
1782         };
1783
1784         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1785         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1786         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1787         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1788
1789         if (exp->ex_fslocs.migrated) {
1790                 BUG_ON(bmval[2]);
1791                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1792                 if (status)
1793                         goto out;
1794         }
1795
1796         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1797         if (err)
1798                 goto out_nfserr;
1799         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1800                         FATTR4_WORD0_MAXNAME)) ||
1801             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1802                        FATTR4_WORD1_SPACE_TOTAL))) {
1803                 err = vfs_statfs(&path, &statfs);
1804                 if (err)
1805                         goto out_nfserr;
1806         }
1807         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1808                 fh_init(&tempfh, NFS4_FHSIZE);
1809                 status = fh_compose(&tempfh, exp, dentry, NULL);
1810                 if (status)
1811                         goto out;
1812                 fhp = &tempfh;
1813         }
1814         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1815                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1816                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1817                 aclsupport = (err == 0);
1818                 if (bmval0 & FATTR4_WORD0_ACL) {
1819                         if (err == -EOPNOTSUPP)
1820                                 bmval0 &= ~FATTR4_WORD0_ACL;
1821                         else if (err == -EINVAL) {
1822                                 status = nfserr_attrnotsupp;
1823                                 goto out;
1824                         } else if (err != 0)
1825                                 goto out_nfserr;
1826                 }
1827         }
1828
1829         if (bmval2) {
1830                 if ((buflen -= 16) < 0)
1831                         goto out_resource;
1832                 WRITE32(3);
1833                 WRITE32(bmval0);
1834                 WRITE32(bmval1);
1835                 WRITE32(bmval2);
1836         } else if (bmval1) {
1837                 if ((buflen -= 12) < 0)
1838                         goto out_resource;
1839                 WRITE32(2);
1840                 WRITE32(bmval0);
1841                 WRITE32(bmval1);
1842         } else {
1843                 if ((buflen -= 8) < 0)
1844                         goto out_resource;
1845                 WRITE32(1);
1846                 WRITE32(bmval0);
1847         }
1848         attrlenp = p++;                /* to be backfilled later */
1849
1850         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1851                 u32 word0 = nfsd_suppattrs0(minorversion);
1852                 u32 word1 = nfsd_suppattrs1(minorversion);
1853                 u32 word2 = nfsd_suppattrs2(minorversion);
1854
1855                 if (!aclsupport)
1856                         word0 &= ~FATTR4_WORD0_ACL;
1857                 if (!word2) {
1858                         if ((buflen -= 12) < 0)
1859                                 goto out_resource;
1860                         WRITE32(2);
1861                         WRITE32(word0);
1862                         WRITE32(word1);
1863                 } else {
1864                         if ((buflen -= 16) < 0)
1865                                 goto out_resource;
1866                         WRITE32(3);
1867                         WRITE32(word0);
1868                         WRITE32(word1);
1869                         WRITE32(word2);
1870                 }
1871         }
1872         if (bmval0 & FATTR4_WORD0_TYPE) {
1873                 if ((buflen -= 4) < 0)
1874                         goto out_resource;
1875                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1876                 if (dummy == NF4BAD)
1877                         goto out_serverfault;
1878                 WRITE32(dummy);
1879         }
1880         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1881                 if ((buflen -= 4) < 0)
1882                         goto out_resource;
1883                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1884                         WRITE32(NFS4_FH_PERSISTENT);
1885                 else
1886                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1887         }
1888         if (bmval0 & FATTR4_WORD0_CHANGE) {
1889                 if ((buflen -= 8) < 0)
1890                         goto out_resource;
1891                 write_change(&p, &stat, dentry->d_inode);
1892         }
1893         if (bmval0 & FATTR4_WORD0_SIZE) {
1894                 if ((buflen -= 8) < 0)
1895                         goto out_resource;
1896                 WRITE64(stat.size);
1897         }
1898         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1899                 if ((buflen -= 4) < 0)
1900                         goto out_resource;
1901                 WRITE32(1);
1902         }
1903         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1904                 if ((buflen -= 4) < 0)
1905                         goto out_resource;
1906                 WRITE32(1);
1907         }
1908         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1909                 if ((buflen -= 4) < 0)
1910                         goto out_resource;
1911                 WRITE32(0);
1912         }
1913         if (bmval0 & FATTR4_WORD0_FSID) {
1914                 if ((buflen -= 16) < 0)
1915                         goto out_resource;
1916                 if (exp->ex_fslocs.migrated) {
1917                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1918                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1919                 } else switch(fsid_source(fhp)) {
1920                 case FSIDSOURCE_FSID:
1921                         WRITE64((u64)exp->ex_fsid);
1922                         WRITE64((u64)0);
1923                         break;
1924                 case FSIDSOURCE_DEV:
1925                         WRITE32(0);
1926                         WRITE32(MAJOR(stat.dev));
1927                         WRITE32(0);
1928                         WRITE32(MINOR(stat.dev));
1929                         break;
1930                 case FSIDSOURCE_UUID:
1931                         WRITEMEM(exp->ex_uuid, 16);
1932                         break;
1933                 }
1934         }
1935         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1936                 if ((buflen -= 4) < 0)
1937                         goto out_resource;
1938                 WRITE32(0);
1939         }
1940         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1941                 if ((buflen -= 4) < 0)
1942                         goto out_resource;
1943                 WRITE32(nfsd4_lease);
1944         }
1945         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1946                 if ((buflen -= 4) < 0)
1947                         goto out_resource;
1948                 WRITE32(rdattr_err);
1949         }
1950         if (bmval0 & FATTR4_WORD0_ACL) {
1951                 struct nfs4_ace *ace;
1952
1953                 if (acl == NULL) {
1954                         if ((buflen -= 4) < 0)
1955                                 goto out_resource;
1956
1957                         WRITE32(0);
1958                         goto out_acl;
1959                 }
1960                 if ((buflen -= 4) < 0)
1961                         goto out_resource;
1962                 WRITE32(acl->naces);
1963
1964                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1965                         if ((buflen -= 4*3) < 0)
1966                                 goto out_resource;
1967                         WRITE32(ace->type);
1968                         WRITE32(ace->flag);
1969                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1970                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1971                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1972                                 &p, &buflen);
1973                         if (status == nfserr_resource)
1974                                 goto out_resource;
1975                         if (status)
1976                                 goto out;
1977                 }
1978         }
1979 out_acl:
1980         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1981                 if ((buflen -= 4) < 0)
1982                         goto out_resource;
1983                 WRITE32(aclsupport ?
1984                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1985         }
1986         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1987                 if ((buflen -= 4) < 0)
1988                         goto out_resource;
1989                 WRITE32(1);
1990         }
1991         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1992                 if ((buflen -= 4) < 0)
1993                         goto out_resource;
1994                 WRITE32(1);
1995         }
1996         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1997                 if ((buflen -= 4) < 0)
1998                         goto out_resource;
1999                 WRITE32(1);
2000         }
2001         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2002                 if ((buflen -= 4) < 0)
2003                         goto out_resource;
2004                 WRITE32(1);
2005         }
2006         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2007                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2008                 if (buflen < 0)
2009                         goto out_resource;
2010                 WRITE32(fhp->fh_handle.fh_size);
2011                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2012         }
2013         if (bmval0 & FATTR4_WORD0_FILEID) {
2014                 if ((buflen -= 8) < 0)
2015                         goto out_resource;
2016                 WRITE64(stat.ino);
2017         }
2018         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2019                 if ((buflen -= 8) < 0)
2020                         goto out_resource;
2021                 WRITE64((u64) statfs.f_ffree);
2022         }
2023         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2024                 if ((buflen -= 8) < 0)
2025                         goto out_resource;
2026                 WRITE64((u64) statfs.f_ffree);
2027         }
2028         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2029                 if ((buflen -= 8) < 0)
2030                         goto out_resource;
2031                 WRITE64((u64) statfs.f_files);
2032         }
2033         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2034                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2035                 if (status == nfserr_resource)
2036                         goto out_resource;
2037                 if (status)
2038                         goto out;
2039         }
2040         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2041                 if ((buflen -= 4) < 0)
2042                         goto out_resource;
2043                 WRITE32(1);
2044         }
2045         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2046                 if ((buflen -= 8) < 0)
2047                         goto out_resource;
2048                 WRITE64(~(u64)0);
2049         }
2050         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2051                 if ((buflen -= 4) < 0)
2052                         goto out_resource;
2053                 WRITE32(255);
2054         }
2055         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2056                 if ((buflen -= 4) < 0)
2057                         goto out_resource;
2058                 WRITE32(statfs.f_namelen);
2059         }
2060         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2061                 if ((buflen -= 8) < 0)
2062                         goto out_resource;
2063                 WRITE64((u64) svc_max_payload(rqstp));
2064         }
2065         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2066                 if ((buflen -= 8) < 0)
2067                         goto out_resource;
2068                 WRITE64((u64) svc_max_payload(rqstp));
2069         }
2070         if (bmval1 & FATTR4_WORD1_MODE) {
2071                 if ((buflen -= 4) < 0)
2072                         goto out_resource;
2073                 WRITE32(stat.mode & S_IALLUGO);
2074         }
2075         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2076                 if ((buflen -= 4) < 0)
2077                         goto out_resource;
2078                 WRITE32(1);
2079         }
2080         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2081                 if ((buflen -= 4) < 0)
2082                         goto out_resource;
2083                 WRITE32(stat.nlink);
2084         }
2085         if (bmval1 & FATTR4_WORD1_OWNER) {
2086                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2087                 if (status == nfserr_resource)
2088                         goto out_resource;
2089                 if (status)
2090                         goto out;
2091         }
2092         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2093                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2094                 if (status == nfserr_resource)
2095                         goto out_resource;
2096                 if (status)
2097                         goto out;
2098         }
2099         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2100                 if ((buflen -= 8) < 0)
2101                         goto out_resource;
2102                 WRITE32((u32) MAJOR(stat.rdev));
2103                 WRITE32((u32) MINOR(stat.rdev));
2104         }
2105         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2106                 if ((buflen -= 8) < 0)
2107                         goto out_resource;
2108                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2109                 WRITE64(dummy64);
2110         }
2111         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2112                 if ((buflen -= 8) < 0)
2113                         goto out_resource;
2114                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2115                 WRITE64(dummy64);
2116         }
2117         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2118                 if ((buflen -= 8) < 0)
2119                         goto out_resource;
2120                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2121                 WRITE64(dummy64);
2122         }
2123         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2124                 if ((buflen -= 8) < 0)
2125                         goto out_resource;
2126                 dummy64 = (u64)stat.blocks << 9;
2127                 WRITE64(dummy64);
2128         }
2129         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2130                 if ((buflen -= 12) < 0)
2131                         goto out_resource;
2132                 WRITE32(0);
2133                 WRITE32(stat.atime.tv_sec);
2134                 WRITE32(stat.atime.tv_nsec);
2135         }
2136         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2137                 if ((buflen -= 12) < 0)
2138                         goto out_resource;
2139                 WRITE32(0);
2140                 WRITE32(1);
2141                 WRITE32(0);
2142         }
2143         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2144                 if ((buflen -= 12) < 0)
2145                         goto out_resource;
2146                 WRITE32(0);
2147                 WRITE32(stat.ctime.tv_sec);
2148                 WRITE32(stat.ctime.tv_nsec);
2149         }
2150         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2151                 if ((buflen -= 12) < 0)
2152                         goto out_resource;
2153                 WRITE32(0);
2154                 WRITE32(stat.mtime.tv_sec);
2155                 WRITE32(stat.mtime.tv_nsec);
2156         }
2157         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2158                 if ((buflen -= 8) < 0)
2159                         goto out_resource;
2160                 /*
2161                  * Get parent's attributes if not ignoring crossmount
2162                  * and this is the root of a cross-mounted filesystem.
2163                  */
2164                 if (ignore_crossmnt == 0 &&
2165                     dentry == exp->ex_path.mnt->mnt_root) {
2166                         struct path path = exp->ex_path;
2167                         path_get(&path);
2168                         while (follow_up(&path)) {
2169                                 if (path.dentry != path.mnt->mnt_root)
2170                                         break;
2171                         }
2172                         err = vfs_getattr(path.mnt, path.dentry, &stat);
2173                         path_put(&path);
2174                         if (err)
2175                                 goto out_nfserr;
2176                 }
2177                 WRITE64(stat.ino);
2178         }
2179         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2180                 WRITE32(3);
2181                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2182                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2183                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2184         }
2185
2186         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2187         *countp = p - buffer;
2188         status = nfs_ok;
2189
2190 out:
2191         kfree(acl);
2192         if (fhp == &tempfh)
2193                 fh_put(&tempfh);
2194         return status;
2195 out_nfserr:
2196         status = nfserrno(err);
2197         goto out;
2198 out_resource:
2199         *countp = 0;
2200         status = nfserr_resource;
2201         goto out;
2202 out_serverfault:
2203         status = nfserr_serverfault;
2204         goto out;
2205 }
2206
2207 static inline int attributes_need_mount(u32 *bmval)
2208 {
2209         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2210                 return 1;
2211         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2212                 return 1;
2213         return 0;
2214 }
2215
2216 static __be32
2217 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2218                 const char *name, int namlen, __be32 *p, int *buflen)
2219 {
2220         struct svc_export *exp = cd->rd_fhp->fh_export;
2221         struct dentry *dentry;
2222         __be32 nfserr;
2223         int ignore_crossmnt = 0;
2224
2225         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2226         if (IS_ERR(dentry))
2227                 return nfserrno(PTR_ERR(dentry));
2228         if (!dentry->d_inode) {
2229                 /*
2230                  * nfsd_buffered_readdir drops the i_mutex between
2231                  * readdir and calling this callback, leaving a window
2232                  * where this directory entry could have gone away.
2233                  */
2234                 dput(dentry);
2235                 return nfserr_noent;
2236         }
2237
2238         exp_get(exp);
2239         /*
2240          * In the case of a mountpoint, the client may be asking for
2241          * attributes that are only properties of the underlying filesystem
2242          * as opposed to the cross-mounted file system. In such a case,
2243          * we will not follow the cross mount and will fill the attribtutes
2244          * directly from the mountpoint dentry.
2245          */
2246         if (nfsd_mountpoint(dentry, exp)) {
2247                 int err;
2248
2249                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2250                                 && !attributes_need_mount(cd->rd_bmval)) {
2251                         ignore_crossmnt = 1;
2252                         goto out_encode;
2253                 }
2254                 /*
2255                  * Why the heck aren't we just using nfsd_lookup??
2256                  * Different "."/".." handling?  Something else?
2257                  * At least, add a comment here to explain....
2258                  */
2259                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2260                 if (err) {
2261                         nfserr = nfserrno(err);
2262                         goto out_put;
2263                 }
2264                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2265                 if (nfserr)
2266                         goto out_put;
2267
2268         }
2269 out_encode:
2270         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2271                                         cd->rd_rqstp, ignore_crossmnt);
2272 out_put:
2273         dput(dentry);
2274         exp_put(exp);
2275         return nfserr;
2276 }
2277
2278 static __be32 *
2279 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2280 {
2281         __be32 *attrlenp;
2282
2283         if (buflen < 6)
2284                 return NULL;
2285         *p++ = htonl(2);
2286         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2287         *p++ = htonl(0);                         /* bmval1 */
2288
2289         attrlenp = p++;
2290         *p++ = nfserr;       /* no htonl */
2291         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2292         return p;
2293 }
2294
2295 static int
2296 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2297                     loff_t offset, u64 ino, unsigned int d_type)
2298 {
2299         struct readdir_cd *ccd = ccdv;
2300         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2301         int buflen;
2302         __be32 *p = cd->buffer;
2303         __be32 *cookiep;
2304         __be32 nfserr = nfserr_toosmall;
2305
2306         /* In nfsv4, "." and ".." never make it onto the wire.. */
2307         if (name && isdotent(name, namlen)) {
2308                 cd->common.err = nfs_ok;
2309                 return 0;
2310         }
2311
2312         if (cd->offset)
2313                 xdr_encode_hyper(cd->offset, (u64) offset);
2314
2315         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2316         if (buflen < 0)
2317                 goto fail;
2318
2319         *p++ = xdr_one;                             /* mark entry present */
2320         cookiep = p;
2321         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2322         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2323
2324         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2325         switch (nfserr) {
2326         case nfs_ok:
2327                 p += buflen;
2328                 break;
2329         case nfserr_resource:
2330                 nfserr = nfserr_toosmall;
2331                 goto fail;
2332         case nfserr_noent:
2333                 goto skip_entry;
2334         default:
2335                 /*
2336                  * If the client requested the RDATTR_ERROR attribute,
2337                  * we stuff the error code into this attribute
2338                  * and continue.  If this attribute was not requested,
2339                  * then in accordance with the spec, we fail the
2340                  * entire READDIR operation(!)
2341                  */
2342                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2343                         goto fail;
2344                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2345                 if (p == NULL) {
2346                         nfserr = nfserr_toosmall;
2347                         goto fail;
2348                 }
2349         }
2350         cd->buflen -= (p - cd->buffer);
2351         cd->buffer = p;
2352         cd->offset = cookiep;
2353 skip_entry:
2354         cd->common.err = nfs_ok;
2355         return 0;
2356 fail:
2357         cd->common.err = nfserr;
2358         return -EINVAL;
2359 }
2360
2361 static void
2362 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2363 {
2364         __be32 *p;
2365
2366         RESERVE_SPACE(sizeof(stateid_t));
2367         WRITE32(sid->si_generation);
2368         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2369         ADJUST_ARGS();
2370 }
2371
2372 static __be32
2373 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2374 {
2375         __be32 *p;
2376
2377         if (!nfserr) {
2378                 RESERVE_SPACE(8);
2379                 WRITE32(access->ac_supported);
2380                 WRITE32(access->ac_resp_access);
2381                 ADJUST_ARGS();
2382         }
2383         return nfserr;
2384 }
2385
2386 static __be32
2387 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2388 {
2389         ENCODE_SEQID_OP_HEAD;
2390
2391         if (!nfserr)
2392                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2393
2394         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2395         return nfserr;
2396 }
2397
2398
2399 static __be32
2400 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2401 {
2402         __be32 *p;
2403
2404         if (!nfserr) {
2405                 RESERVE_SPACE(8);
2406                 WRITEMEM(commit->co_verf.data, 8);
2407                 ADJUST_ARGS();
2408         }
2409         return nfserr;
2410 }
2411
2412 static __be32
2413 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2414 {
2415         __be32 *p;
2416
2417         if (!nfserr) {
2418                 RESERVE_SPACE(32);
2419                 write_cinfo(&p, &create->cr_cinfo);
2420                 WRITE32(2);
2421                 WRITE32(create->cr_bmval[0]);
2422                 WRITE32(create->cr_bmval[1]);
2423                 ADJUST_ARGS();
2424         }
2425         return nfserr;
2426 }
2427
2428 static __be32
2429 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2430 {
2431         struct svc_fh *fhp = getattr->ga_fhp;
2432         int buflen;
2433
2434         if (nfserr)
2435                 return nfserr;
2436
2437         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2438         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2439                                     resp->p, &buflen, getattr->ga_bmval,
2440                                     resp->rqstp, 0);
2441         if (!nfserr)
2442                 resp->p += buflen;
2443         return nfserr;
2444 }
2445
2446 static __be32
2447 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2448 {
2449         struct svc_fh *fhp = *fhpp;
2450         unsigned int len;
2451         __be32 *p;
2452
2453         if (!nfserr) {
2454                 len = fhp->fh_handle.fh_size;
2455                 RESERVE_SPACE(len + 4);
2456                 WRITE32(len);
2457                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2458                 ADJUST_ARGS();
2459         }
2460         return nfserr;
2461 }
2462
2463 /*
2464 * Including all fields other than the name, a LOCK4denied structure requires
2465 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2466 */
2467 static void
2468 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2469 {
2470         __be32 *p;
2471
2472         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2473         WRITE64(ld->ld_start);
2474         WRITE64(ld->ld_length);
2475         WRITE32(ld->ld_type);
2476         if (ld->ld_sop) {
2477                 WRITEMEM(&ld->ld_clientid, 8);
2478                 WRITE32(ld->ld_sop->so_owner.len);
2479                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2480                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2481         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2482                 WRITE64((u64)0); /* clientid */
2483                 WRITE32(0); /* length of owner name */
2484         }
2485         ADJUST_ARGS();
2486 }
2487
2488 static __be32
2489 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2490 {
2491         ENCODE_SEQID_OP_HEAD;
2492
2493         if (!nfserr)
2494                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2495         else if (nfserr == nfserr_denied)
2496                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2497
2498         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2499         return nfserr;
2500 }
2501
2502 static __be32
2503 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2504 {
2505         if (nfserr == nfserr_denied)
2506                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2507         return nfserr;
2508 }
2509
2510 static __be32
2511 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2512 {
2513         ENCODE_SEQID_OP_HEAD;
2514
2515         if (!nfserr)
2516                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2517
2518         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2519         return nfserr;
2520 }
2521
2522
2523 static __be32
2524 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2525 {
2526         __be32 *p;
2527
2528         if (!nfserr) {
2529                 RESERVE_SPACE(20);
2530                 write_cinfo(&p, &link->li_cinfo);
2531                 ADJUST_ARGS();
2532         }
2533         return nfserr;
2534 }
2535
2536
2537 static __be32
2538 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2539 {
2540         __be32 *p;
2541         ENCODE_SEQID_OP_HEAD;
2542
2543         if (nfserr)
2544                 goto out;
2545
2546         nfsd4_encode_stateid(resp, &open->op_stateid);
2547         RESERVE_SPACE(40);
2548         write_cinfo(&p, &open->op_cinfo);
2549         WRITE32(open->op_rflags);
2550         WRITE32(2);
2551         WRITE32(open->op_bmval[0]);
2552         WRITE32(open->op_bmval[1]);
2553         WRITE32(open->op_delegate_type);
2554         ADJUST_ARGS();
2555
2556         switch (open->op_delegate_type) {
2557         case NFS4_OPEN_DELEGATE_NONE:
2558                 break;
2559         case NFS4_OPEN_DELEGATE_READ:
2560                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2561                 RESERVE_SPACE(20);
2562                 WRITE32(open->op_recall);
2563
2564                 /*
2565                  * TODO: ACE's in delegations
2566                  */
2567                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2568                 WRITE32(0);
2569                 WRITE32(0);
2570                 WRITE32(0);   /* XXX: is NULL principal ok? */
2571                 ADJUST_ARGS();
2572                 break;
2573         case NFS4_OPEN_DELEGATE_WRITE:
2574                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2575                 RESERVE_SPACE(32);
2576                 WRITE32(0);
2577
2578                 /*
2579                  * TODO: space_limit's in delegations
2580                  */
2581                 WRITE32(NFS4_LIMIT_SIZE);
2582                 WRITE32(~(u32)0);
2583                 WRITE32(~(u32)0);
2584
2585                 /*
2586                  * TODO: ACE's in delegations
2587                  */
2588                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2589                 WRITE32(0);
2590                 WRITE32(0);
2591                 WRITE32(0);   /* XXX: is NULL principal ok? */
2592                 ADJUST_ARGS();
2593                 break;
2594         default:
2595                 BUG();
2596         }
2597         /* XXX save filehandle here */
2598 out:
2599         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2600         return nfserr;
2601 }
2602
2603 static __be32
2604 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2605 {
2606         ENCODE_SEQID_OP_HEAD;
2607
2608         if (!nfserr)
2609                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2610
2611         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2612         return nfserr;
2613 }
2614
2615 static __be32
2616 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2617 {
2618         ENCODE_SEQID_OP_HEAD;
2619
2620         if (!nfserr)
2621                 nfsd4_encode_stateid(resp, &od->od_stateid);
2622
2623         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2624         return nfserr;
2625 }
2626
2627 static __be32
2628 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2629                   struct nfsd4_read *read)
2630 {
2631         u32 eof;
2632         int v, pn;
2633         unsigned long maxcount;
2634         long len;
2635         __be32 *p;
2636
2637         if (nfserr)
2638                 return nfserr;
2639         if (resp->xbuf->page_len)
2640                 return nfserr_resource;
2641
2642         RESERVE_SPACE(8); /* eof flag and byte count */
2643
2644         maxcount = svc_max_payload(resp->rqstp);
2645         if (maxcount > read->rd_length)
2646                 maxcount = read->rd_length;
2647
2648         len = maxcount;
2649         v = 0;
2650         while (len > 0) {
2651                 pn = resp->rqstp->rq_resused++;
2652                 resp->rqstp->rq_vec[v].iov_base =
2653                         page_address(resp->rqstp->rq_respages[pn]);
2654                 resp->rqstp->rq_vec[v].iov_len =
2655                         len < PAGE_SIZE ? len : PAGE_SIZE;
2656                 v++;
2657                 len -= PAGE_SIZE;
2658         }
2659         read->rd_vlen = v;
2660
2661         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2662                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2663                         &maxcount);
2664
2665         if (nfserr == nfserr_symlink)
2666                 nfserr = nfserr_inval;
2667         if (nfserr)
2668                 return nfserr;
2669         eof = (read->rd_offset + maxcount >=
2670                read->rd_fhp->fh_dentry->d_inode->i_size);
2671
2672         WRITE32(eof);
2673         WRITE32(maxcount);
2674         ADJUST_ARGS();
2675         resp->xbuf->head[0].iov_len = (char*)p
2676                                         - (char*)resp->xbuf->head[0].iov_base;
2677         resp->xbuf->page_len = maxcount;
2678
2679         /* Use rest of head for padding and remaining ops: */
2680         resp->xbuf->tail[0].iov_base = p;
2681         resp->xbuf->tail[0].iov_len = 0;
2682         if (maxcount&3) {
2683                 RESERVE_SPACE(4);
2684                 WRITE32(0);
2685                 resp->xbuf->tail[0].iov_base += maxcount&3;
2686                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2687                 ADJUST_ARGS();
2688         }
2689         return 0;
2690 }
2691
2692 static __be32
2693 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2694 {
2695         int maxcount;
2696         char *page;
2697         __be32 *p;
2698
2699         if (nfserr)
2700                 return nfserr;
2701         if (resp->xbuf->page_len)
2702                 return nfserr_resource;
2703
2704         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2705
2706         maxcount = PAGE_SIZE;
2707         RESERVE_SPACE(4);
2708
2709         /*
2710          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2711          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2712          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2713          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2714          */
2715         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2716         if (nfserr == nfserr_isdir)
2717                 return nfserr_inval;
2718         if (nfserr)
2719                 return nfserr;
2720
2721         WRITE32(maxcount);
2722         ADJUST_ARGS();
2723         resp->xbuf->head[0].iov_len = (char*)p
2724                                 - (char*)resp->xbuf->head[0].iov_base;
2725         resp->xbuf->page_len = maxcount;
2726
2727         /* Use rest of head for padding and remaining ops: */
2728         resp->xbuf->tail[0].iov_base = p;
2729         resp->xbuf->tail[0].iov_len = 0;
2730         if (maxcount&3) {
2731                 RESERVE_SPACE(4);
2732                 WRITE32(0);
2733                 resp->xbuf->tail[0].iov_base += maxcount&3;
2734                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2735                 ADJUST_ARGS();
2736         }
2737         return 0;
2738 }
2739
2740 static __be32
2741 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2742 {
2743         int maxcount;
2744         loff_t offset;
2745         __be32 *page, *savep, *tailbase;
2746         __be32 *p;
2747
2748         if (nfserr)
2749                 return nfserr;
2750         if (resp->xbuf->page_len)
2751                 return nfserr_resource;
2752
2753         RESERVE_SPACE(8);  /* verifier */
2754         savep = p;
2755
2756         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2757         WRITE32(0);
2758         WRITE32(0);
2759         ADJUST_ARGS();
2760         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2761         tailbase = p;
2762
2763         maxcount = PAGE_SIZE;
2764         if (maxcount > readdir->rd_maxcount)
2765                 maxcount = readdir->rd_maxcount;
2766
2767         /*
2768          * Convert from bytes to words, account for the two words already
2769          * written, make sure to leave two words at the end for the next
2770          * pointer and eof field.
2771          */
2772         maxcount = (maxcount >> 2) - 4;
2773         if (maxcount < 0) {
2774                 nfserr =  nfserr_toosmall;
2775                 goto err_no_verf;
2776         }
2777
2778         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2779         readdir->common.err = 0;
2780         readdir->buflen = maxcount;
2781         readdir->buffer = page;
2782         readdir->offset = NULL;
2783
2784         offset = readdir->rd_cookie;
2785         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2786                               &offset,
2787                               &readdir->common, nfsd4_encode_dirent);
2788         if (nfserr == nfs_ok &&
2789             readdir->common.err == nfserr_toosmall &&
2790             readdir->buffer == page)
2791                 nfserr = nfserr_toosmall;
2792         if (nfserr == nfserr_symlink)
2793                 nfserr = nfserr_notdir;
2794         if (nfserr)
2795                 goto err_no_verf;
2796
2797         if (readdir->offset)
2798                 xdr_encode_hyper(readdir->offset, offset);
2799
2800         p = readdir->buffer;
2801         *p++ = 0;       /* no more entries */
2802         *p++ = htonl(readdir->common.err == nfserr_eof);
2803         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2804                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2805
2806         /* Use rest of head for padding and remaining ops: */
2807         resp->xbuf->tail[0].iov_base = tailbase;
2808         resp->xbuf->tail[0].iov_len = 0;
2809         resp->p = resp->xbuf->tail[0].iov_base;
2810         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2811
2812         return 0;
2813 err_no_verf:
2814         p = savep;
2815         ADJUST_ARGS();
2816         return nfserr;
2817 }
2818
2819 static __be32
2820 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2821 {
2822         __be32 *p;
2823
2824         if (!nfserr) {
2825                 RESERVE_SPACE(20);
2826                 write_cinfo(&p, &remove->rm_cinfo);
2827                 ADJUST_ARGS();
2828         }
2829         return nfserr;
2830 }
2831
2832 static __be32
2833 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2834 {
2835         __be32 *p;
2836
2837         if (!nfserr) {
2838                 RESERVE_SPACE(40);
2839                 write_cinfo(&p, &rename->rn_sinfo);
2840                 write_cinfo(&p, &rename->rn_tinfo);
2841                 ADJUST_ARGS();
2842         }
2843         return nfserr;
2844 }
2845
2846 static __be32
2847 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
2848                          __be32 nfserr,struct svc_export *exp)
2849 {
2850         int i = 0;
2851         u32 nflavs;
2852         struct exp_flavor_info *flavs;
2853         struct exp_flavor_info def_flavs[2];
2854         __be32 *p;
2855
2856         if (nfserr)
2857                 goto out;
2858         if (exp->ex_nflavors) {
2859                 flavs = exp->ex_flavors;
2860                 nflavs = exp->ex_nflavors;
2861         } else { /* Handling of some defaults in absence of real secinfo: */
2862                 flavs = def_flavs;
2863                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2864                         nflavs = 2;
2865                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2866                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2867                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2868                         nflavs = 1;
2869                         flavs[0].pseudoflavor
2870                                         = svcauth_gss_flavor(exp->ex_client);
2871                 } else {
2872                         nflavs = 1;
2873                         flavs[0].pseudoflavor
2874                                         = exp->ex_client->flavour->flavour;
2875                 }
2876         }
2877
2878         RESERVE_SPACE(4);
2879         WRITE32(nflavs);
2880         ADJUST_ARGS();
2881         for (i = 0; i < nflavs; i++) {
2882                 u32 flav = flavs[i].pseudoflavor;
2883                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2884
2885                 if (gm) {
2886                         RESERVE_SPACE(4);
2887                         WRITE32(RPC_AUTH_GSS);
2888                         ADJUST_ARGS();
2889                         RESERVE_SPACE(4 + gm->gm_oid.len);
2890                         WRITE32(gm->gm_oid.len);
2891                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2892                         ADJUST_ARGS();
2893                         RESERVE_SPACE(4);
2894                         WRITE32(0); /* qop */
2895                         ADJUST_ARGS();
2896                         RESERVE_SPACE(4);
2897                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2898                         ADJUST_ARGS();
2899                         gss_mech_put(gm);
2900                 } else {
2901                         RESERVE_SPACE(4);
2902                         WRITE32(flav);
2903                         ADJUST_ARGS();
2904                 }
2905         }
2906 out:
2907         if (exp)
2908                 exp_put(exp);
2909         return nfserr;
2910 }
2911
2912 static __be32
2913 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2914                      struct nfsd4_secinfo *secinfo)
2915 {
2916         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
2917 }
2918
2919 static __be32
2920 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
2921                      struct nfsd4_secinfo_no_name *secinfo)
2922 {
2923         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
2924 }
2925
2926 /*
2927  * The SETATTR encode routine is special -- it always encodes a bitmap,
2928  * regardless of the error status.
2929  */
2930 static __be32
2931 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2932 {
2933         __be32 *p;
2934
2935         RESERVE_SPACE(12);
2936         if (nfserr) {
2937                 WRITE32(2);
2938                 WRITE32(0);
2939                 WRITE32(0);
2940         }
2941         else {
2942                 WRITE32(2);
2943                 WRITE32(setattr->sa_bmval[0]);
2944                 WRITE32(setattr->sa_bmval[1]);
2945         }
2946         ADJUST_ARGS();
2947         return nfserr;
2948 }
2949
2950 static __be32
2951 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2952 {
2953         __be32 *p;
2954
2955         if (!nfserr) {
2956                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2957                 WRITEMEM(&scd->se_clientid, 8);
2958                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2959                 ADJUST_ARGS();
2960         }
2961         else if (nfserr == nfserr_clid_inuse) {
2962                 RESERVE_SPACE(8);
2963                 WRITE32(0);
2964                 WRITE32(0);
2965                 ADJUST_ARGS();
2966         }
2967         return nfserr;
2968 }
2969
2970 static __be32
2971 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2972 {
2973         __be32 *p;
2974
2975         if (!nfserr) {
2976                 RESERVE_SPACE(16);
2977                 WRITE32(write->wr_bytes_written);
2978                 WRITE32(write->wr_how_written);
2979                 WRITEMEM(write->wr_verifier.data, 8);
2980                 ADJUST_ARGS();
2981         }
2982         return nfserr;
2983 }
2984
2985 static __be32
2986 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2987                          struct nfsd4_exchange_id *exid)
2988 {
2989         __be32 *p;
2990         char *major_id;
2991         char *server_scope;
2992         int major_id_sz;
2993         int server_scope_sz;
2994         uint64_t minor_id = 0;
2995
2996         if (nfserr)
2997                 return nfserr;
2998
2999         major_id = utsname()->nodename;
3000         major_id_sz = strlen(major_id);
3001         server_scope = utsname()->nodename;
3002         server_scope_sz = strlen(server_scope);
3003
3004         RESERVE_SPACE(
3005                 8 /* eir_clientid */ +
3006                 4 /* eir_sequenceid */ +
3007                 4 /* eir_flags */ +
3008                 4 /* spr_how (SP4_NONE) */ +
3009                 8 /* so_minor_id */ +
3010                 4 /* so_major_id.len */ +
3011                 (XDR_QUADLEN(major_id_sz) * 4) +
3012                 4 /* eir_server_scope.len */ +
3013                 (XDR_QUADLEN(server_scope_sz) * 4) +
3014                 4 /* eir_server_impl_id.count (0) */);
3015
3016         WRITEMEM(&exid->clientid, 8);
3017         WRITE32(exid->seqid);
3018         WRITE32(exid->flags);
3019
3020         /* state_protect4_r. Currently only support SP4_NONE */
3021         BUG_ON(exid->spa_how != SP4_NONE);
3022         WRITE32(exid->spa_how);
3023
3024         /* The server_owner struct */
3025         WRITE64(minor_id);      /* Minor id */
3026         /* major id */
3027         WRITE32(major_id_sz);
3028         WRITEMEM(major_id, major_id_sz);
3029
3030         /* Server scope */
3031         WRITE32(server_scope_sz);
3032         WRITEMEM(server_scope, server_scope_sz);
3033
3034         /* Implementation id */
3035         WRITE32(0);     /* zero length nfs_impl_id4 array */
3036         ADJUST_ARGS();
3037         return 0;
3038 }
3039
3040 static __be32
3041 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3042                             struct nfsd4_create_session *sess)
3043 {
3044         __be32 *p;
3045
3046         if (nfserr)
3047                 return nfserr;
3048
3049         RESERVE_SPACE(24);
3050         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3051         WRITE32(sess->seqid);
3052         WRITE32(sess->flags);
3053         ADJUST_ARGS();
3054
3055         RESERVE_SPACE(28);
3056         WRITE32(0); /* headerpadsz */
3057         WRITE32(sess->fore_channel.maxreq_sz);
3058         WRITE32(sess->fore_channel.maxresp_sz);
3059         WRITE32(sess->fore_channel.maxresp_cached);
3060         WRITE32(sess->fore_channel.maxops);
3061         WRITE32(sess->fore_channel.maxreqs);
3062         WRITE32(sess->fore_channel.nr_rdma_attrs);
3063         ADJUST_ARGS();
3064
3065         if (sess->fore_channel.nr_rdma_attrs) {
3066                 RESERVE_SPACE(4);
3067                 WRITE32(sess->fore_channel.rdma_attrs);
3068                 ADJUST_ARGS();
3069         }
3070
3071         RESERVE_SPACE(28);
3072         WRITE32(0); /* headerpadsz */
3073         WRITE32(sess->back_channel.maxreq_sz);
3074         WRITE32(sess->back_channel.maxresp_sz);
3075         WRITE32(sess->back_channel.maxresp_cached);
3076         WRITE32(sess->back_channel.maxops);
3077         WRITE32(sess->back_channel.maxreqs);
3078         WRITE32(sess->back_channel.nr_rdma_attrs);
3079         ADJUST_ARGS();
3080
3081         if (sess->back_channel.nr_rdma_attrs) {
3082                 RESERVE_SPACE(4);
3083                 WRITE32(sess->back_channel.rdma_attrs);
3084                 ADJUST_ARGS();
3085         }
3086         return 0;
3087 }
3088
3089 static __be32
3090 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3091                              struct nfsd4_destroy_session *destroy_session)
3092 {
3093         return nfserr;
3094 }
3095
3096 __be32
3097 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3098                       struct nfsd4_sequence *seq)
3099 {
3100         __be32 *p;
3101
3102         if (nfserr)
3103                 return nfserr;
3104
3105         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3106         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3107         WRITE32(seq->seqid);
3108         WRITE32(seq->slotid);
3109         WRITE32(seq->maxslots);
3110         /*
3111          * FIXME: for now:
3112          *   target_maxslots = maxslots
3113          *   status_flags = 0
3114          */
3115         WRITE32(seq->maxslots);
3116         WRITE32(0);
3117
3118         ADJUST_ARGS();
3119         resp->cstate.datap = p; /* DRC cache data pointer */
3120         return 0;
3121 }
3122
3123 static __be32
3124 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3125 {
3126         return nfserr;
3127 }
3128
3129 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3130
3131 /*
3132  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3133  * since we don't need to filter out obsolete ops as this is
3134  * done in the decoding phase.
3135  */
3136 static nfsd4_enc nfsd4_enc_ops[] = {
3137         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3138         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3139         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3140         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3141         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3142         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3143         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3144         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3145         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3146         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3147         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3148         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3149         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3150         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3151         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3152         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3153         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3154         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3155         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3156         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3157         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3158         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3159         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3160         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3161         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3162         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3163         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3164         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3165         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3166         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3167         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3168         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3169         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3170         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3171         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3172         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3173         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3174
3175         /* NFSv4.1 operations */
3176         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3177         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3178         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3179         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3180         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3181         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3182         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3183         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3184         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3185         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3186         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3187         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3188         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3189         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3190         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3191         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3192         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3193         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3194         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3195 };
3196
3197 /*
3198  * Calculate the total amount of memory that the compound response has taken
3199  * after encoding the current operation.
3200  *
3201  * pad: add on 8 bytes for the next operation's op_code and status so that
3202  * there is room to cache a failure on the next operation.
3203  *
3204  * Compare this length to the session se_fmaxresp_cached.
3205  *
3206  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3207  * will be at least a page and will therefore hold the xdr_buf head.
3208  */
3209 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3210 {
3211         int status = 0;
3212         struct xdr_buf *xb = &resp->rqstp->rq_res;
3213         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3214         struct nfsd4_session *session = NULL;
3215         struct nfsd4_slot *slot = resp->cstate.slot;
3216         u32 length, tlen = 0, pad = 8;
3217
3218         if (!nfsd4_has_session(&resp->cstate))
3219                 return status;
3220
3221         session = resp->cstate.session;
3222         if (session == NULL || slot->sl_cachethis == 0)
3223                 return status;
3224
3225         if (resp->opcnt >= args->opcnt)
3226                 pad = 0; /* this is the last operation */
3227
3228         if (xb->page_len == 0) {
3229                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3230         } else {
3231                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3232                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3233
3234                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3235         }
3236         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3237                 length, xb->page_len, tlen, pad);
3238
3239         if (length <= session->se_fchannel.maxresp_cached)
3240                 return status;
3241         else
3242                 return nfserr_rep_too_big_to_cache;
3243 }
3244
3245 void
3246 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3247 {
3248         __be32 *statp;
3249         __be32 *p;
3250
3251         RESERVE_SPACE(8);
3252         WRITE32(op->opnum);
3253         statp = p++;    /* to be backfilled at the end */
3254         ADJUST_ARGS();
3255
3256         if (op->opnum == OP_ILLEGAL)
3257                 goto status;
3258         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3259                !nfsd4_enc_ops[op->opnum]);
3260         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3261         /* nfsd4_check_drc_limit guarantees enough room for error status */
3262         if (!op->status && nfsd4_check_drc_limit(resp))
3263                 op->status = nfserr_rep_too_big_to_cache;
3264 status:
3265         /*
3266          * Note: We write the status directly, instead of using WRITE32(),
3267          * since it is already in network byte order.
3268          */
3269         *statp = op->status;
3270 }
3271
3272 /*
3273  * Encode the reply stored in the stateowner reply cache
3274  *
3275  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3276  * previously sent already encoded operation.
3277  *
3278  * called with nfs4_lock_state() held
3279  */
3280 void
3281 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3282 {
3283         __be32 *p;
3284         struct nfs4_replay *rp = op->replay;
3285
3286         BUG_ON(!rp);
3287
3288         RESERVE_SPACE(8);
3289         WRITE32(op->opnum);
3290         *p++ = rp->rp_status;  /* already xdr'ed */
3291         ADJUST_ARGS();
3292
3293         RESERVE_SPACE(rp->rp_buflen);
3294         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3295         ADJUST_ARGS();
3296 }
3297
3298 int
3299 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3300 {
3301         return xdr_ressize_check(rqstp, p);
3302 }
3303
3304 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3305 {
3306         if (args->ops != args->iops) {
3307                 kfree(args->ops);
3308                 args->ops = args->iops;
3309         }
3310         kfree(args->tmpp);
3311         args->tmpp = NULL;
3312         while (args->to_free) {
3313                 struct tmpbuf *tb = args->to_free;
3314                 args->to_free = tb->next;
3315                 tb->release(tb->buf);
3316                 kfree(tb);
3317         }
3318 }
3319
3320 int
3321 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3322 {
3323         __be32 status;
3324
3325         args->p = p;
3326         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3327         args->pagelist = rqstp->rq_arg.pages;
3328         args->pagelen = rqstp->rq_arg.page_len;
3329         args->tmpp = NULL;
3330         args->to_free = NULL;
3331         args->ops = args->iops;
3332         args->rqstp = rqstp;
3333
3334         status = nfsd4_decode_compound(args);
3335         if (status) {
3336                 nfsd4_release_compoundargs(args);
3337         }
3338         return !status;
3339 }
3340
3341 int
3342 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3343 {
3344         /*
3345          * All that remains is to write the tag and operation count...
3346          */
3347         struct nfsd4_compound_state *cs = &resp->cstate;
3348         struct kvec *iov;
3349         p = resp->tagp;
3350         *p++ = htonl(resp->taglen);
3351         memcpy(p, resp->tag, resp->taglen);
3352         p += XDR_QUADLEN(resp->taglen);
3353         *p++ = htonl(resp->opcnt);
3354
3355         if (rqstp->rq_res.page_len)
3356                 iov = &rqstp->rq_res.tail[0];
3357         else
3358                 iov = &rqstp->rq_res.head[0];
3359         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3360         BUG_ON(iov->iov_len > PAGE_SIZE);
3361         if (nfsd4_has_session(cs)) {
3362                 if (cs->status != nfserr_replay_cache) {
3363                         nfsd4_store_cache_entry(resp);
3364                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3365                         cs->slot->sl_inuse = false;
3366                 }
3367                 /* Renew the clientid on success and on replay */
3368                 release_session_client(cs->session);
3369                 nfsd4_put_session(cs->session);
3370         }
3371         return 1;
3372 }
3373
3374 /*
3375  * Local variables:
3376  *  c-basic-offset: 8
3377  * End:
3378  */