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   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/param.h>
  44 #include <linux/smp.h>
  45 #include <linux/fs.h>
  46 #include <linux/namei.h>
  47 #include <linux/vfs.h>
  48 #include <linux/utsname.h>
  49 #include <linux/sunrpc/xdr.h>
  50 #include <linux/sunrpc/svc.h>
  51 #include <linux/sunrpc/clnt.h>
  52 #include <linux/nfsd/nfsd.h>
  53 #include <linux/nfsd/state.h>
  54 #include <linux/nfsd/xdr4.h>
  55 #include <linux/nfsd_idmap.h>
  56 #include <linux/nfs4.h>
  57 #include <linux/nfs4_acl.h>
  58 #include <linux/sunrpc/gss_api.h>
  59 #include <linux/sunrpc/svcauth_gss.h>
  60
  61 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  62
  63 /*
  64  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  65  * directory in order to indicate to the client that a filesystem boundary is present
  66  * We use a fixed fsid for a referral
  67  */
  68 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  69 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  70
  71 static __be32
  72 check_filename(char *str, int len, __be32 err)
  73 {
  74         int i;
  75
  76         if (len == 0)
  77                 return nfserr_inval;
  78         if (isdotent(str, len))
  79                 return err;
  80         for (i = 0; i < len; i++)
  81                 if (str[i] == '/')
  82                         return err;
  83         return 0;
  84 }
  85
  86 #define DECODE_HEAD                             \
  87         __be32 *p;                              \
  88         __be32 status
  89 #define DECODE_TAIL                             \
  90         status = 0;                             \
  91 out:                                            \
  92         return status;                          \
  93 xdr_error:                                      \
  94         dprintk("NFSD: xdr error (%s:%d)\n",    \
  95                         __FILE__, __LINE__);    \
  96         status = nfserr_bad_xdr;                \
  97         goto out
  98
  99 #define READ32(x)         (x) = ntohl(*p++)
 100 #define READ64(x)         do {                  \
 101         (x) = (u64)ntohl(*p++) << 32;           \
 102         (x) |= ntohl(*p++);                     \
 103 } while (0)
 104 #define READTIME(x)       do {                  \
 105         p++;                                    \
 106         (x) = ntohl(*p++);                      \
 107         p++;                                    \
 108 } while (0)
 109 #define READMEM(x,nbytes) do {                  \
 110         x = (char *)p;                          \
 111         p += XDR_QUADLEN(nbytes);               \
 112 } while (0)
 113 #define SAVEMEM(x,nbytes) do {                  \
 114         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 115                 savemem(argp, p, nbytes) :      \
 116                 (char *)p)) {                   \
 117                 dprintk("NFSD: xdr error (%s:%d)\n", \
 118                                 __FILE__, __LINE__); \
 119                 goto xdr_error;                 \
 120                 }                               \
 121         p += XDR_QUADLEN(nbytes);               \
 122 } while (0)
 123 #define COPYMEM(x,nbytes) do {                  \
 124         memcpy((x), p, nbytes);                 \
 125         p += XDR_QUADLEN(nbytes);               \
 126 } while (0)
 127
 128 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 129 #define READ_BUF(nbytes)  do {                  \
 130         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 131                 p = argp->p;                    \
 132                 argp->p += XDR_QUADLEN(nbytes); \
 133         } else if (!(p = read_buf(argp, nbytes))) { \
 134                 dprintk("NFSD: xdr error (%s:%d)\n", \
 135                                 __FILE__, __LINE__); \
 136                 goto xdr_error;                 \
 137         }                                       \
 138 } while (0)
 139
 140 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 141 {
 142         /* We want more bytes than seem to be available.
 143          * Maybe we need a new page, maybe we have just run out
 144          */
 145         unsigned int avail = (char *)argp->end - (char *)argp->p;
 146         __be32 *p;
 147         if (avail + argp->pagelen < nbytes)
 148                 return NULL;
 149         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 150                 return NULL;
 151         /* ok, we can do it with the current plus the next page */
 152         if (nbytes <= sizeof(argp->tmp))
 153                 p = argp->tmp;
 154         else {
 155                 kfree(argp->tmpp);
 156                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 157                 if (!p)
 158                         return NULL;
 159
 160         }
 161         /*
 162          * The following memcpy is safe because read_buf is always
 163          * called with nbytes > avail, and the two cases above both
 164          * guarantee p points to at least nbytes bytes.
 165          */
 166         memcpy(p, argp->p, avail);
 167         /* step to next page */
 168         argp->p = page_address(argp->pagelist[0]);
 169         argp->pagelist++;
 170         if (argp->pagelen < PAGE_SIZE) {
 171                 argp->end = p + (argp->pagelen>>2);
 172                 argp->pagelen = 0;
 173         } else {
 174                 argp->end = p + (PAGE_SIZE>>2);
 175                 argp->pagelen -= PAGE_SIZE;
 176         }
 177         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 178         argp->p += XDR_QUADLEN(nbytes - avail);
 179         return p;
 180 }
 181
 182 static int zero_clientid(clientid_t *clid)
 183 {
 184         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 185 }
 186
 187 static int
 188 defer_free(struct nfsd4_compoundargs *argp,
 189                 void (*release)(const void *), void *p)
 190 {
 191         struct tmpbuf *tb;
 192
 193         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 194         if (!tb)
 195                 return -ENOMEM;
 196         tb->buf = p;
 197         tb->release = release;
 198         tb->next = argp->to_free;
 199         argp->to_free = tb;
 200         return 0;
 201 }
 202
 203 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 204 {
 205         if (p == argp->tmp) {
 206                 p = kmalloc(nbytes, GFP_KERNEL);
 207                 if (!p)
 208                         return NULL;
 209                 memcpy(p, argp->tmp, nbytes);
 210         } else {
 211                 BUG_ON(p != argp->tmpp);
 212                 argp->tmpp = NULL;
 213         }
 214         if (defer_free(argp, kfree, p)) {
 215                 kfree(p);
 216                 return NULL;
 217         } else
 218                 return (char *)p;
 219 }
 220
 221 static __be32
 222 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 223 {
 224         u32 bmlen;
 225         DECODE_HEAD;
 226
 227         bmval[0] = 0;
 228         bmval[1] = 0;
 229         bmval[2] = 0;
 230
 231         READ_BUF(4);
 232         READ32(bmlen);
 233         if (bmlen > 1000)
 234                 goto xdr_error;
 235
 236         READ_BUF(bmlen << 2);
 237         if (bmlen > 0)
 238                 READ32(bmval[0]);
 239         if (bmlen > 1)
 240                 READ32(bmval[1]);
 241         if (bmlen > 2)
 242                 READ32(bmval[2]);
 243
 244         DECODE_TAIL;
 245 }
 246
 247 static __be32
 248 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 249                    struct iattr *iattr, struct nfs4_acl **acl)
 250 {
 251         int expected_len, len = 0;
 252         u32 dummy32;
 253         char *buf;
 254         int host_err;
 255
 256         DECODE_HEAD;
 257         iattr->ia_valid = 0;
 258         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 259                 return status;
 260
 261         READ_BUF(4);
 262         READ32(expected_len);
 263
 264         if (bmval[0] & FATTR4_WORD0_SIZE) {
 265                 READ_BUF(8);
 266                 len += 8;
 267                 READ64(iattr->ia_size);
 268                 iattr->ia_valid |= ATTR_SIZE;
 269         }
 270         if (bmval[0] & FATTR4_WORD0_ACL) {
 271                 int nace;
 272                 struct nfs4_ace *ace;
 273
 274                 READ_BUF(4); len += 4;
 275                 READ32(nace);
 276
 277                 if (nace > NFS4_ACL_MAX)
 278                         return nfserr_resource;
 279
 280                 *acl = nfs4_acl_new(nace);
 281                 if (*acl == NULL) {
 282                         host_err = -ENOMEM;
 283                         goto out_nfserr;
 284                 }
 285                 defer_free(argp, kfree, *acl);
 286
 287                 (*acl)->naces = nace;
 288                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 289                         READ_BUF(16); len += 16;
 290                         READ32(ace->type);
 291                         READ32(ace->flag);
 292                         READ32(ace->access_mask);
 293                         READ32(dummy32);
 294                         READ_BUF(dummy32);
 295                         len += XDR_QUADLEN(dummy32) << 2;
 296                         READMEM(buf, dummy32);
 297                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 298                         host_err = 0;
 299                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 300                                 ace->who = 0;
 301                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 302                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 303                                                 buf, dummy32, &ace->who);
 304                         else
 305                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 306                                                 buf, dummy32, &ace->who);
 307                         if (host_err)
 308                                 goto out_nfserr;
 309                 }
 310         } else
 311                 *acl = NULL;
 312         if (bmval[1] & FATTR4_WORD1_MODE) {
 313                 READ_BUF(4);
 314                 len += 4;
 315                 READ32(iattr->ia_mode);
 316                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 317                 iattr->ia_valid |= ATTR_MODE;
 318         }
 319         if (bmval[1] & FATTR4_WORD1_OWNER) {
 320                 READ_BUF(4);
 321                 len += 4;
 322                 READ32(dummy32);
 323                 READ_BUF(dummy32);
 324                 len += (XDR_QUADLEN(dummy32) << 2);
 325                 READMEM(buf, dummy32);
 326                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 327                         goto out_nfserr;
 328                 iattr->ia_valid |= ATTR_UID;
 329         }
 330         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 331                 READ_BUF(4);
 332                 len += 4;
 333                 READ32(dummy32);
 334                 READ_BUF(dummy32);
 335                 len += (XDR_QUADLEN(dummy32) << 2);
 336                 READMEM(buf, dummy32);
 337                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 338                         goto out_nfserr;
 339                 iattr->ia_valid |= ATTR_GID;
 340         }
 341         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 342                 READ_BUF(4);
 343                 len += 4;
 344                 READ32(dummy32);
 345                 switch (dummy32) {
 346                 case NFS4_SET_TO_CLIENT_TIME:
 347                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 348                            all 32 bits of 'nseconds'. */
 349                         READ_BUF(12);
 350                         len += 12;
 351                         READ32(dummy32);
 352                         if (dummy32)
 353                                 return nfserr_inval;
 354                         READ32(iattr->ia_atime.tv_sec);
 355                         READ32(iattr->ia_atime.tv_nsec);
 356                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 357                                 return nfserr_inval;
 358                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 359                         break;
 360                 case NFS4_SET_TO_SERVER_TIME:
 361                         iattr->ia_valid |= ATTR_ATIME;
 362                         break;
 363                 default:
 364                         goto xdr_error;
 365                 }
 366         }
 367         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 368                 READ_BUF(4);
 369                 len += 4;
 370                 READ32(dummy32);
 371                 switch (dummy32) {
 372                 case NFS4_SET_TO_CLIENT_TIME:
 373                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 374                            all 32 bits of 'nseconds'. */
 375                         READ_BUF(12);
 376                         len += 12;
 377                         READ32(dummy32);
 378                         if (dummy32)
 379                                 return nfserr_inval;
 380                         READ32(iattr->ia_mtime.tv_sec);
 381                         READ32(iattr->ia_mtime.tv_nsec);
 382                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 383                                 return nfserr_inval;
 384                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 385                         break;
 386                 case NFS4_SET_TO_SERVER_TIME:
 387                         iattr->ia_valid |= ATTR_MTIME;
 388                         break;
 389                 default:
 390                         goto xdr_error;
 391                 }
 392         }
 393         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 394             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 395             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 396                 READ_BUF(expected_len - len);
 397         else if (len != expected_len)
 398                 goto xdr_error;
 399
 400         DECODE_TAIL;
 401
 402 out_nfserr:
 403         status = nfserrno(host_err);
 404         goto out;
 405 }
 406
 407 static __be32
 408 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 409 {
 410         DECODE_HEAD;
 411
 412         READ_BUF(sizeof(stateid_t));
 413         READ32(sid->si_generation);
 414         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 415
 416         DECODE_TAIL;
 417 }
 418
 419 static __be32
 420 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 421 {
 422         DECODE_HEAD;
 423
 424         READ_BUF(4);
 425         READ32(access->ac_req_access);
 426
 427         DECODE_TAIL;
 428 }
 429
 430 static __be32
 431 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 432 {
 433         DECODE_HEAD;
 434
 435         close->cl_stateowner = NULL;
 436         READ_BUF(4);
 437         READ32(close->cl_seqid);
 438         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 439
 440         DECODE_TAIL;
 441 }
 442
 443
 444 static __be32
 445 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 446 {
 447         DECODE_HEAD;
 448
 449         READ_BUF(12);
 450         READ64(commit->co_offset);
 451         READ32(commit->co_count);
 452
 453         DECODE_TAIL;
 454 }
 455
 456 static __be32
 457 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 458 {
 459         DECODE_HEAD;
 460
 461         READ_BUF(4);
 462         READ32(create->cr_type);
 463         switch (create->cr_type) {
 464         case NF4LNK:
 465                 READ_BUF(4);
 466                 READ32(create->cr_linklen);
 467                 READ_BUF(create->cr_linklen);
 468                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 469                 break;
 470         case NF4BLK:
 471         case NF4CHR:
 472                 READ_BUF(8);
 473                 READ32(create->cr_specdata1);
 474                 READ32(create->cr_specdata2);
 475                 break;
 476         case NF4SOCK:
 477         case NF4FIFO:
 478         case NF4DIR:
 479         default:
 480                 break;
 481         }
 482
 483         READ_BUF(4);
 484         READ32(create->cr_namelen);
 485         READ_BUF(create->cr_namelen);
 486         SAVEMEM(create->cr_name, create->cr_namelen);
 487         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 488                 return status;
 489
 490         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 491                                     &create->cr_acl);
 492         if (status)
 493                 goto out;
 494
 495         DECODE_TAIL;
 496 }
 497
 498 static inline __be32
 499 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 500 {
 501         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 502 }
 503
 504 static inline __be32
 505 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 506 {
 507         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 508 }
 509
 510 static __be32
 511 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 512 {
 513         DECODE_HEAD;
 514
 515         READ_BUF(4);
 516         READ32(link->li_namelen);
 517         READ_BUF(link->li_namelen);
 518         SAVEMEM(link->li_name, link->li_namelen);
 519         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 520                 return status;
 521
 522         DECODE_TAIL;
 523 }
 524
 525 static __be32
 526 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 527 {
 528         DECODE_HEAD;
 529
 530         lock->lk_replay_owner = NULL;
 531         /*
 532         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 533         */
 534         READ_BUF(28);
 535         READ32(lock->lk_type);
 536         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 537                 goto xdr_error;
 538         READ32(lock->lk_reclaim);
 539         READ64(lock->lk_offset);
 540         READ64(lock->lk_length);
 541         READ32(lock->lk_is_new);
 542
 543         if (lock->lk_is_new) {
 544                 READ_BUF(4);
 545                 READ32(lock->lk_new_open_seqid);
 546                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 547                 if (status)
 548                         return status;
 549                 READ_BUF(8 + sizeof(clientid_t));
 550                 READ32(lock->lk_new_lock_seqid);
 551                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 552                 READ32(lock->lk_new_owner.len);
 553                 READ_BUF(lock->lk_new_owner.len);
 554                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 555         } else {
 556                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 557                 if (status)
 558                         return status;
 559                 READ_BUF(4);
 560                 READ32(lock->lk_old_lock_seqid);
 561         }
 562
 563         DECODE_TAIL;
 564 }
 565
 566 static __be32
 567 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 568 {
 569         DECODE_HEAD;
 570
 571         READ_BUF(32);
 572         READ32(lockt->lt_type);
 573         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 574                 goto xdr_error;
 575         READ64(lockt->lt_offset);
 576         READ64(lockt->lt_length);
 577         COPYMEM(&lockt->lt_clientid, 8);
 578         READ32(lockt->lt_owner.len);
 579         READ_BUF(lockt->lt_owner.len);
 580         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 581
 582         if (argp->minorversion && !zero_clientid(&lockt->lt_clientid))
 583                 return nfserr_inval;
 584         DECODE_TAIL;
 585 }
 586
 587 static __be32
 588 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 589 {
 590         DECODE_HEAD;
 591
 592         locku->lu_stateowner = NULL;
 593         READ_BUF(8);
 594         READ32(locku->lu_type);
 595         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 596                 goto xdr_error;
 597         READ32(locku->lu_seqid);
 598         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 599         if (status)
 600                 return status;
 601         READ_BUF(16);
 602         READ64(locku->lu_offset);
 603         READ64(locku->lu_length);
 604
 605         DECODE_TAIL;
 606 }
 607
 608 static __be32
 609 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 610 {
 611         DECODE_HEAD;
 612
 613         READ_BUF(4);
 614         READ32(lookup->lo_len);
 615         READ_BUF(lookup->lo_len);
 616         SAVEMEM(lookup->lo_name, lookup->lo_len);
 617         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 618                 return status;
 619
 620         DECODE_TAIL;
 621 }
 622
 623 static __be32
 624 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 625 {
 626         DECODE_HEAD;
 627
 628         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 629         open->op_iattr.ia_valid = 0;
 630         open->op_stateowner = NULL;
 631
 632         /* seqid, share_access, share_deny, clientid, ownerlen */
 633         READ_BUF(16 + sizeof(clientid_t));
 634         READ32(open->op_seqid);
 635         READ32(open->op_share_access);
 636         READ32(open->op_share_deny);
 637         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 638         READ32(open->op_owner.len);
 639
 640         /* owner, open_flag */
 641         READ_BUF(open->op_owner.len + 4);
 642         SAVEMEM(open->op_owner.data, open->op_owner.len);
 643         READ32(open->op_create);
 644         switch (open->op_create) {
 645         case NFS4_OPEN_NOCREATE:
 646                 break;
 647         case NFS4_OPEN_CREATE:
 648                 READ_BUF(4);
 649                 READ32(open->op_createmode);
 650                 switch (open->op_createmode) {
 651                 case NFS4_CREATE_UNCHECKED:
 652                 case NFS4_CREATE_GUARDED:
 653                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 654                                 &open->op_iattr, &open->op_acl);
 655                         if (status)
 656                                 goto out;
 657                         break;
 658                 case NFS4_CREATE_EXCLUSIVE:
 659                         READ_BUF(8);
 660                         COPYMEM(open->op_verf.data, 8);
 661                         break;
 662                 case NFS4_CREATE_EXCLUSIVE4_1:
 663                         if (argp->minorversion < 1)
 664                                 goto xdr_error;
 665                         READ_BUF(8);
 666                         COPYMEM(open->op_verf.data, 8);
 667                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 668                                 &open->op_iattr, &open->op_acl);
 669                         if (status)
 670                                 goto out;
 671                         break;
 672                 default:
 673                         goto xdr_error;
 674                 }
 675                 break;
 676         default:
 677                 goto xdr_error;
 678         }
 679
 680         /* open_claim */
 681         READ_BUF(4);
 682         READ32(open->op_claim_type);
 683         switch (open->op_claim_type) {
 684         case NFS4_OPEN_CLAIM_NULL:
 685         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 686                 READ_BUF(4);
 687                 READ32(open->op_fname.len);
 688                 READ_BUF(open->op_fname.len);
 689                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 690                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 691                         return status;
 692                 break;
 693         case NFS4_OPEN_CLAIM_PREVIOUS:
 694                 READ_BUF(4);
 695                 READ32(open->op_delegate_type);
 696                 break;
 697         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 698                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 699                 if (status)
 700                         return status;
 701                 READ_BUF(4);
 702                 READ32(open->op_fname.len);
 703                 READ_BUF(open->op_fname.len);
 704                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 705                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 706                         return status;
 707                 break;
 708         default:
 709                 goto xdr_error;
 710         }
 711
 712         DECODE_TAIL;
 713 }
 714
 715 static __be32
 716 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 717 {
 718         DECODE_HEAD;
 719
 720         open_conf->oc_stateowner = NULL;
 721         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 722         if (status)
 723                 return status;
 724         READ_BUF(4);
 725         READ32(open_conf->oc_seqid);
 726
 727         DECODE_TAIL;
 728 }
 729
 730 static __be32
 731 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 732 {
 733         DECODE_HEAD;
 734
 735         open_down->od_stateowner = NULL;
 736         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 737         if (status)
 738                 return status;
 739         READ_BUF(12);
 740         READ32(open_down->od_seqid);
 741         READ32(open_down->od_share_access);
 742         READ32(open_down->od_share_deny);
 743
 744         DECODE_TAIL;
 745 }
 746
 747 static __be32
 748 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 749 {
 750         DECODE_HEAD;
 751
 752         READ_BUF(4);
 753         READ32(putfh->pf_fhlen);
 754         if (putfh->pf_fhlen > NFS4_FHSIZE)
 755                 goto xdr_error;
 756         READ_BUF(putfh->pf_fhlen);
 757         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 758
 759         DECODE_TAIL;
 760 }
 761
 762 static __be32
 763 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 764 {
 765         DECODE_HEAD;
 766
 767         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 768         if (status)
 769                 return status;
 770         READ_BUF(12);
 771         READ64(read->rd_offset);
 772         READ32(read->rd_length);
 773
 774         DECODE_TAIL;
 775 }
 776
 777 static __be32
 778 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 779 {
 780         DECODE_HEAD;
 781
 782         READ_BUF(24);
 783         READ64(readdir->rd_cookie);
 784         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 785         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 786         READ32(readdir->rd_maxcount);
 787         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 788                 goto out;
 789
 790         DECODE_TAIL;
 791 }
 792
 793 static __be32
 794 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 795 {
 796         DECODE_HEAD;
 797
 798         READ_BUF(4);
 799         READ32(remove->rm_namelen);
 800         READ_BUF(remove->rm_namelen);
 801         SAVEMEM(remove->rm_name, remove->rm_namelen);
 802         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 803                 return status;
 804
 805         DECODE_TAIL;
 806 }
 807
 808 static __be32
 809 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 810 {
 811         DECODE_HEAD;
 812
 813         READ_BUF(4);
 814         READ32(rename->rn_snamelen);
 815         READ_BUF(rename->rn_snamelen + 4);
 816         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 817         READ32(rename->rn_tnamelen);
 818         READ_BUF(rename->rn_tnamelen);
 819         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 820         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 821                 return status;
 822         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 823                 return status;
 824
 825         DECODE_TAIL;
 826 }
 827
 828 static __be32
 829 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 830 {
 831         DECODE_HEAD;
 832
 833         READ_BUF(sizeof(clientid_t));
 834         COPYMEM(clientid, sizeof(clientid_t));
 835
 836         DECODE_TAIL;
 837 }
 838
 839 static __be32
 840 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 841                      struct nfsd4_secinfo *secinfo)
 842 {
 843         DECODE_HEAD;
 844
 845         READ_BUF(4);
 846         READ32(secinfo->si_namelen);
 847         READ_BUF(secinfo->si_namelen);
 848         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 849         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 850                                                                 nfserr_noent);
 851         if (status)
 852                 return status;
 853         DECODE_TAIL;
 854 }
 855
 856 static __be32
 857 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 858 {
 859         __be32 status;
 860
 861         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 862         if (status)
 863                 return status;
 864         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 865                                   &setattr->sa_acl);
 866 }
 867
 868 static __be32
 869 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 870 {
 871         DECODE_HEAD;
 872
 873         READ_BUF(12);
 874         COPYMEM(setclientid->se_verf.data, 8);
 875         READ32(setclientid->se_namelen);
 876
 877         READ_BUF(setclientid->se_namelen + 8);
 878         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 879         READ32(setclientid->se_callback_prog);
 880         READ32(setclientid->se_callback_netid_len);
 881
 882         READ_BUF(setclientid->se_callback_netid_len + 4);
 883         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 884         READ32(setclientid->se_callback_addr_len);
 885
 886         READ_BUF(setclientid->se_callback_addr_len + 4);
 887         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 888         READ32(setclientid->se_callback_ident);
 889
 890         DECODE_TAIL;
 891 }
 892
 893 static __be32
 894 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 895 {
 896         DECODE_HEAD;
 897
 898         READ_BUF(8 + sizeof(nfs4_verifier));
 899         COPYMEM(&scd_c->sc_clientid, 8);
 900         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 901
 902         DECODE_TAIL;
 903 }
 904
 905 /* Also used for NVERIFY */
 906 static __be32
 907 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 908 {
 909 #if 0
 910         struct nfsd4_compoundargs save = {
 911                 .p = argp->p,
 912                 .end = argp->end,
 913                 .rqstp = argp->rqstp,
 914         };
 915         u32             ve_bmval[2];
 916         struct iattr    ve_iattr;           /* request */
 917         struct nfs4_acl *ve_acl;            /* request */
 918 #endif
 919         DECODE_HEAD;
 920
 921         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 922                 goto out;
 923
 924         /* For convenience's sake, we compare raw xdr'd attributes in
 925          * nfsd4_proc_verify; however we still decode here just to return
 926          * correct error in case of bad xdr. */
 927 #if 0
 928         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 929         if (status == nfserr_inval) {
 930                 status = nfserrno(status);
 931                 goto out;
 932         }
 933 #endif
 934         READ_BUF(4);
 935         READ32(verify->ve_attrlen);
 936         READ_BUF(verify->ve_attrlen);
 937         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 938
 939         DECODE_TAIL;
 940 }
 941
 942 static __be32
 943 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 944 {
 945         int avail;
 946         int v;
 947         int len;
 948         DECODE_HEAD;
 949
 950         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
 951         if (status)
 952                 return status;
 953         READ_BUF(16);
 954         READ64(write->wr_offset);
 955         READ32(write->wr_stable_how);
 956         if (write->wr_stable_how > 2)
 957                 goto xdr_error;
 958         READ32(write->wr_buflen);
 959
 960         /* Sorry .. no magic macros for this.. *
 961          * READ_BUF(write->wr_buflen);
 962          * SAVEMEM(write->wr_buf, write->wr_buflen);
 963          */
 964         avail = (char*)argp->end - (char*)argp->p;
 965         if (avail + argp->pagelen < write->wr_buflen) {
 966                 dprintk("NFSD: xdr error (%s:%d)\n",
 967                                 __FILE__, __LINE__);
 968                 goto xdr_error;
 969         }
 970         argp->rqstp->rq_vec[0].iov_base = p;
 971         argp->rqstp->rq_vec[0].iov_len = avail;
 972         v = 0;
 973         len = write->wr_buflen;
 974         while (len > argp->rqstp->rq_vec[v].iov_len) {
 975                 len -= argp->rqstp->rq_vec[v].iov_len;
 976                 v++;
 977                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 978                 argp->pagelist++;
 979                 if (argp->pagelen >= PAGE_SIZE) {
 980                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 981                         argp->pagelen -= PAGE_SIZE;
 982                 } else {
 983                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 984                         argp->pagelen -= len;
 985                 }
 986         }
 987         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 988         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 989         argp->rqstp->rq_vec[v].iov_len = len;
 990         write->wr_vlen = v+1;
 991
 992         DECODE_TAIL;
 993 }
 994
 995 static __be32
 996 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 997 {
 998         DECODE_HEAD;
 999
1000         READ_BUF(12);
1001         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1002         READ32(rlockowner->rl_owner.len);
1003         READ_BUF(rlockowner->rl_owner.len);
1004         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1005
1006         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1007                 return nfserr_inval;
1008         DECODE_TAIL;
1009 }
1010
1011 static __be32
1012 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1013                          struct nfsd4_exchange_id *exid)
1014 {
1015         int dummy;
1016         DECODE_HEAD;
1017
1018         READ_BUF(NFS4_VERIFIER_SIZE);
1019         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1020
1021         READ_BUF(4);
1022         READ32(exid->clname.len);
1023
1024         READ_BUF(exid->clname.len);
1025         SAVEMEM(exid->clname.data, exid->clname.len);
1026
1027         READ_BUF(4);
1028         READ32(exid->flags);
1029
1030         /* Ignore state_protect4_a */
1031         READ_BUF(4);
1032         READ32(exid->spa_how);
1033         switch (exid->spa_how) {
1034         case SP4_NONE:
1035                 break;
1036         case SP4_MACH_CRED:
1037                 /* spo_must_enforce */
1038                 READ_BUF(4);
1039                 READ32(dummy);
1040                 READ_BUF(dummy * 4);
1041                 p += dummy;
1042
1043                 /* spo_must_allow */
1044                 READ_BUF(4);
1045                 READ32(dummy);
1046                 READ_BUF(dummy * 4);
1047                 p += dummy;
1048                 break;
1049         case SP4_SSV:
1050                 /* ssp_ops */
1051                 READ_BUF(4);
1052                 READ32(dummy);
1053                 READ_BUF(dummy * 4);
1054                 p += dummy;
1055
1056                 READ_BUF(4);
1057                 READ32(dummy);
1058                 READ_BUF(dummy * 4);
1059                 p += dummy;
1060
1061                 /* ssp_hash_algs<> */
1062                 READ_BUF(4);
1063                 READ32(dummy);
1064                 READ_BUF(dummy);
1065                 p += XDR_QUADLEN(dummy);
1066
1067                 /* ssp_encr_algs<> */
1068                 READ_BUF(4);
1069                 READ32(dummy);
1070                 READ_BUF(dummy);
1071                 p += XDR_QUADLEN(dummy);
1072
1073                 /* ssp_window and ssp_num_gss_handles */
1074                 READ_BUF(8);
1075                 READ32(dummy);
1076                 READ32(dummy);
1077                 break;
1078         default:
1079                 goto xdr_error;
1080         }
1081
1082         /* Ignore Implementation ID */
1083         READ_BUF(4);    /* nfs_impl_id4 array length */
1084         READ32(dummy);
1085
1086         if (dummy > 1)
1087                 goto xdr_error;
1088
1089         if (dummy == 1) {
1090                 /* nii_domain */
1091                 READ_BUF(4);
1092                 READ32(dummy);
1093                 READ_BUF(dummy);
1094                 p += XDR_QUADLEN(dummy);
1095
1096                 /* nii_name */
1097                 READ_BUF(4);
1098                 READ32(dummy);
1099                 READ_BUF(dummy);
1100                 p += XDR_QUADLEN(dummy);
1101
1102                 /* nii_date */
1103                 READ_BUF(12);
1104                 p += 3;
1105         }
1106         DECODE_TAIL;
1107 }
1108
1109 static __be32
1110 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1111                             struct nfsd4_create_session *sess)
1112 {
1113         DECODE_HEAD;
1114
1115         u32 dummy;
1116         char *machine_name;
1117         int i;
1118         int nr_secflavs;
1119
1120         READ_BUF(16);
1121         COPYMEM(&sess->clientid, 8);
1122         READ32(sess->seqid);
1123         READ32(sess->flags);
1124
1125         /* Fore channel attrs */
1126         READ_BUF(28);
1127         READ32(dummy); /* headerpadsz is always 0 */
1128         READ32(sess->fore_channel.maxreq_sz);
1129         READ32(sess->fore_channel.maxresp_sz);
1130         READ32(sess->fore_channel.maxresp_cached);
1131         READ32(sess->fore_channel.maxops);
1132         READ32(sess->fore_channel.maxreqs);
1133         READ32(sess->fore_channel.nr_rdma_attrs);
1134         if (sess->fore_channel.nr_rdma_attrs == 1) {
1135                 READ_BUF(4);
1136                 READ32(sess->fore_channel.rdma_attrs);
1137         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1138                 dprintk("Too many fore channel attr bitmaps!\n");
1139                 goto xdr_error;
1140         }
1141
1142         /* Back channel attrs */
1143         READ_BUF(28);
1144         READ32(dummy); /* headerpadsz is always 0 */
1145         READ32(sess->back_channel.maxreq_sz);
1146         READ32(sess->back_channel.maxresp_sz);
1147         READ32(sess->back_channel.maxresp_cached);
1148         READ32(sess->back_channel.maxops);
1149         READ32(sess->back_channel.maxreqs);
1150         READ32(sess->back_channel.nr_rdma_attrs);
1151         if (sess->back_channel.nr_rdma_attrs == 1) {
1152                 READ_BUF(4);
1153                 READ32(sess->back_channel.rdma_attrs);
1154         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1155                 dprintk("Too many back channel attr bitmaps!\n");
1156                 goto xdr_error;
1157         }
1158
1159         READ_BUF(8);
1160         READ32(sess->callback_prog);
1161
1162         /* callback_sec_params4 */
1163         READ32(nr_secflavs);
1164         for (i = 0; i < nr_secflavs; ++i) {
1165                 READ_BUF(4);
1166                 READ32(dummy);
1167                 switch (dummy) {
1168                 case RPC_AUTH_NULL:
1169                         /* Nothing to read */
1170                         break;
1171                 case RPC_AUTH_UNIX:
1172                         READ_BUF(8);
1173                         /* stamp */
1174                         READ32(dummy);
1175
1176                         /* machine name */
1177                         READ32(dummy);
1178                         READ_BUF(dummy);
1179                         SAVEMEM(machine_name, dummy);
1180
1181                         /* uid, gid */
1182                         READ_BUF(8);
1183                         READ32(sess->uid);
1184                         READ32(sess->gid);
1185
1186                         /* more gids */
1187                         READ_BUF(4);
1188                         READ32(dummy);
1189                         READ_BUF(dummy * 4);
1190                         for (i = 0; i < dummy; ++i)
1191                                 READ32(dummy);
1192                         break;
1193                 case RPC_AUTH_GSS:
1194                         dprintk("RPC_AUTH_GSS callback secflavor "
1195                                 "not supported!\n");
1196                         READ_BUF(8);
1197                         /* gcbp_service */
1198                         READ32(dummy);
1199                         /* gcbp_handle_from_server */
1200                         READ32(dummy);
1201                         READ_BUF(dummy);
1202                         p += XDR_QUADLEN(dummy);
1203                         /* gcbp_handle_from_client */
1204                         READ_BUF(4);
1205                         READ32(dummy);
1206                         READ_BUF(dummy);
1207                         p += XDR_QUADLEN(dummy);
1208                         break;
1209                 default:
1210                         dprintk("Illegal callback secflavor\n");
1211                         return nfserr_inval;
1212                 }
1213         }
1214         DECODE_TAIL;
1215 }
1216
1217 static __be32
1218 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1219                              struct nfsd4_destroy_session *destroy_session)
1220 {
1221         DECODE_HEAD;
1222         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1223         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1224
1225         DECODE_TAIL;
1226 }
1227
1228 static __be32
1229 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1230                       struct nfsd4_sequence *seq)
1231 {
1232         DECODE_HEAD;
1233
1234         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1235         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1236         READ32(seq->seqid);
1237         READ32(seq->slotid);
1238         READ32(seq->maxslots);
1239         READ32(seq->cachethis);
1240
1241         DECODE_TAIL;
1242 }
1243
1244 static __be32
1245 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1246 {
1247         return nfs_ok;
1248 }
1249
1250 static __be32
1251 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1252 {
1253         return nfserr_notsupp;
1254 }
1255
1256 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1257
1258 static nfsd4_dec nfsd4_dec_ops[] = {
1259         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1260         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1261         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1262         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1263         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1264         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1265         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1266         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1267         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1268         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1269         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1270         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1271         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1272         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1273         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1274         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1275         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1276         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1277         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1278         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1279         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1280         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1281         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1282         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1283         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1284         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1285         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1286         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1287         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1288         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1289         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1290         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1291         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1292         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1293         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1294         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1295         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1296 };
1297
1298 static nfsd4_dec nfsd41_dec_ops[] = {
1299         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1300         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1301         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1302         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1303         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1304         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1305         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1306         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1307         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1308         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1309         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1310         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1311         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1312         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1313         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1314         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1315         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1316         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1317         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1318         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1319         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1320         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1321         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1322         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1323         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1324         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1325         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1326         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1327         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1328         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1329         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1330         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1331         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1332         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1333         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1334         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1335         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1336
1337         /* new operations for NFSv4.1 */
1338         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1339         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_notsupp,
1340         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1341         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1342         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1343         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1344         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1345         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1346         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1347         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1348         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1349         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1350         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_notsupp,
1351         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1352         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1353         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1354         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1355         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_notsupp,
1356         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_notsupp,
1357 };
1358
1359 struct nfsd4_minorversion_ops {
1360         nfsd4_dec *decoders;
1361         int nops;
1362 };
1363
1364 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1365         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1366         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1367 };
1368
1369 static __be32
1370 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1371 {
1372         DECODE_HEAD;
1373         struct nfsd4_op *op;
1374         struct nfsd4_minorversion_ops *ops;
1375         int i;
1376
1377         /*
1378          * XXX: According to spec, we should check the tag
1379          * for UTF-8 compliance.  I'm postponing this for
1380          * now because it seems that some clients do use
1381          * binary tags.
1382          */
1383         READ_BUF(4);
1384         READ32(argp->taglen);
1385         READ_BUF(argp->taglen + 8);
1386         SAVEMEM(argp->tag, argp->taglen);
1387         READ32(argp->minorversion);
1388         READ32(argp->opcnt);
1389
1390         if (argp->taglen > NFSD4_MAX_TAGLEN)
1391                 goto xdr_error;
1392         if (argp->opcnt > 100)
1393                 goto xdr_error;
1394
1395         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1396                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1397                 if (!argp->ops) {
1398                         argp->ops = argp->iops;
1399                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1400                         goto xdr_error;
1401                 }
1402         }
1403
1404         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1405                 argp->opcnt = 0;
1406
1407         ops = &nfsd4_minorversion[argp->minorversion];
1408         for (i = 0; i < argp->opcnt; i++) {
1409                 op = &argp->ops[i];
1410                 op->replay = NULL;
1411
1412                 /*
1413                  * We can't use READ_BUF() here because we need to handle
1414                  * a missing opcode as an OP_WRITE + 1. So we need to check
1415                  * to see if we're truly at the end of our buffer or if there
1416                  * is another page we need to flip to.
1417                  */
1418
1419                 if (argp->p == argp->end) {
1420                         if (argp->pagelen < 4) {
1421                                 /* There isn't an opcode still on the wire */
1422                                 op->opnum = OP_WRITE + 1;
1423                                 op->status = nfserr_bad_xdr;
1424                                 argp->opcnt = i+1;
1425                                 break;
1426                         }
1427
1428                         /*
1429                          * False alarm. We just hit a page boundary, but there
1430                          * is still data available.  Move pointer across page
1431                          * boundary.  *snip from READ_BUF*
1432                          */
1433                         argp->p = page_address(argp->pagelist[0]);
1434                         argp->pagelist++;
1435                         if (argp->pagelen < PAGE_SIZE) {
1436                                 argp->end = p + (argp->pagelen>>2);
1437                                 argp->pagelen = 0;
1438                         } else {
1439                                 argp->end = p + (PAGE_SIZE>>2);
1440                                 argp->pagelen -= PAGE_SIZE;
1441                         }
1442                 }
1443                 op->opnum = ntohl(*argp->p++);
1444
1445                 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1446                         op->status = ops->decoders[op->opnum](argp, &op->u);
1447                 else {
1448                         op->opnum = OP_ILLEGAL;
1449                         op->status = nfserr_op_illegal;
1450                 }
1451
1452                 if (op->status) {
1453                         argp->opcnt = i+1;
1454                         break;
1455                 }
1456         }
1457
1458         DECODE_TAIL;
1459 }
1460
1461 #define WRITE32(n)               *p++ = htonl(n)
1462 #define WRITE64(n)               do {                           \
1463         *p++ = htonl((u32)((n) >> 32));                         \
1464         *p++ = htonl((u32)(n));                                 \
1465 } while (0)
1466 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1467         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1468         memcpy(p, ptr, nbytes);                                 \
1469         p += XDR_QUADLEN(nbytes);                               \
1470 }} while (0)
1471
1472 static void write32(__be32 **p, u32 n)
1473 {
1474         *(*p)++ = n;
1475 }
1476
1477 static void write64(__be32 **p, u64 n)
1478 {
1479         write32(p, (u32)(n >> 32));
1480         write32(p, (u32)n);
1481 }
1482
1483 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1484 {
1485         if (IS_I_VERSION(inode)) {
1486                 write64(p, inode->i_version);
1487         } else {
1488                 write32(p, stat->ctime.tv_sec);
1489                 write32(p, stat->ctime.tv_nsec);
1490         }
1491 }
1492
1493 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1494 {
1495         write32(p, c->atomic);
1496         if (c->change_supported) {
1497                 write64(p, c->before_change);
1498                 write64(p, c->after_change);
1499         } else {
1500                 write32(p, c->before_ctime_sec);
1501                 write32(p, c->before_ctime_nsec);
1502                 write32(p, c->after_ctime_sec);
1503                 write32(p, c->after_ctime_nsec);
1504         }
1505 }
1506
1507 #define RESERVE_SPACE(nbytes)   do {                            \
1508         p = resp->p;                                            \
1509         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1510 } while (0)
1511 #define ADJUST_ARGS()           resp->p = p
1512
1513 /*
1514  * Header routine to setup seqid operation replay cache
1515  */
1516 #define ENCODE_SEQID_OP_HEAD                                    \
1517         __be32 *save;                                           \
1518                                                                 \
1519         save = resp->p;
1520
1521 /*
1522  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1523  * is where sequence id's are incremented, and the replay cache is filled.
1524  * Note that we increment sequence id's here, at the last moment, so we're sure
1525  * we know whether the error to be returned is a sequence id mutating error.
1526  */
1527
1528 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1529         if (seqid_mutating_err(nfserr) && stateowner) {         \
1530                 stateowner->so_seqid++;                         \
1531                 stateowner->so_replay.rp_status = nfserr;       \
1532                 stateowner->so_replay.rp_buflen =               \
1533                           (((char *)(resp)->p - (char *)save)); \
1534                 memcpy(stateowner->so_replay.rp_buf, save,      \
1535                         stateowner->so_replay.rp_buflen);       \
1536         } } while (0);
1537
1538 /* Encode as an array of strings the string given with components
1539  * seperated @sep.
1540  */
1541 static __be32 nfsd4_encode_components(char sep, char *components,
1542                                    __be32 **pp, int *buflen)
1543 {
1544         __be32 *p = *pp;
1545         __be32 *countp = p;
1546         int strlen, count=0;
1547         char *str, *end;
1548
1549         dprintk("nfsd4_encode_components(%s)\n", components);
1550         if ((*buflen -= 4) < 0)
1551                 return nfserr_resource;
1552         WRITE32(0); /* We will fill this in with @count later */
1553         end = str = components;
1554         while (*end) {
1555                 for (; *end && (*end != sep); end++)
1556                         ; /* Point to end of component */
1557                 strlen = end - str;
1558                 if (strlen) {
1559                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1560                                 return nfserr_resource;
1561                         WRITE32(strlen);
1562                         WRITEMEM(str, strlen);
1563                         count++;
1564                 }
1565                 else
1566                         end++;
1567                 str = end;
1568         }
1569         *pp = p;
1570         p = countp;
1571         WRITE32(count);
1572         return 0;
1573 }
1574
1575 /*
1576  * encode a location element of a fs_locations structure
1577  */
1578 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1579                                     __be32 **pp, int *buflen)
1580 {
1581         __be32 status;
1582         __be32 *p = *pp;
1583
1584         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1585         if (status)
1586                 return status;
1587         status = nfsd4_encode_components('/', location->path, &p, buflen);
1588         if (status)
1589                 return status;
1590         *pp = p;
1591         return 0;
1592 }
1593
1594 /*
1595  * Return the path to an export point in the pseudo filesystem namespace
1596  * Returned string is safe to use as long as the caller holds a reference
1597  * to @exp.
1598  */
1599 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1600 {
1601         struct svc_fh tmp_fh;
1602         char *path = NULL, *rootpath;
1603         size_t rootlen;
1604
1605         fh_init(&tmp_fh, NFS4_FHSIZE);
1606         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1607         if (*stat)
1608                 return NULL;
1609         rootpath = tmp_fh.fh_export->ex_pathname;
1610
1611         path = exp->ex_pathname;
1612
1613         rootlen = strlen(rootpath);
1614         if (strncmp(path, rootpath, rootlen)) {
1615                 dprintk("nfsd: fs_locations failed;"
1616                         "%s is not contained in %s\n", path, rootpath);
1617                 *stat = nfserr_notsupp;
1618                 path = NULL;
1619                 goto out;
1620         }
1621         path += rootlen;
1622 out:
1623         fh_put(&tmp_fh);
1624         return path;
1625 }
1626
1627 /*
1628  *  encode a fs_locations structure
1629  */
1630 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1631                                      struct svc_export *exp,
1632                                      __be32 **pp, int *buflen)
1633 {
1634         __be32 status;
1635         int i;
1636         __be32 *p = *pp;
1637         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1638         char *root = nfsd4_path(rqstp, exp, &status);
1639
1640         if (status)
1641                 return status;
1642         status = nfsd4_encode_components('/', root, &p, buflen);
1643         if (status)
1644                 return status;
1645         if ((*buflen -= 4) < 0)
1646                 return nfserr_resource;
1647         WRITE32(fslocs->locations_count);
1648         for (i=0; i<fslocs->locations_count; i++) {
1649                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1650                                                    &p, buflen);
1651                 if (status)
1652                         return status;
1653         }
1654         *pp = p;
1655         return 0;
1656 }
1657
1658 static u32 nfs4_ftypes[16] = {
1659         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1660         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1661         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1662         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1663 };
1664
1665 static __be32
1666 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1667                         __be32 **p, int *buflen)
1668 {
1669         int status;
1670
1671         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1672                 return nfserr_resource;
1673         if (whotype != NFS4_ACL_WHO_NAMED)
1674                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1675         else if (group)
1676                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1677         else
1678                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1679         if (status < 0)
1680                 return nfserrno(status);
1681         *p = xdr_encode_opaque(*p, NULL, status);
1682         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1683         BUG_ON(*buflen < 0);
1684         return 0;
1685 }
1686
1687 static inline __be32
1688 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1689 {
1690         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1691 }
1692
1693 static inline __be32
1694 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1695 {
1696         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1697 }
1698
1699 static inline __be32
1700 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1701                 __be32 **p, int *buflen)
1702 {
1703         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1704 }
1705
1706 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1707                               FATTR4_WORD0_RDATTR_ERROR)
1708 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1709
1710 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1711 {
1712         /* As per referral draft:  */
1713         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1714             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1715                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1716                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1717                         *rdattr_err = NFSERR_MOVED;
1718                 else
1719                         return nfserr_moved;
1720         }
1721         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1722         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1723         return 0;
1724 }
1725
1726 /*
1727  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1728  * ourselves.
1729  *
1730  * @countp is the buffer size in _words_; upon successful return this becomes
1731  * replaced with the number of words written.
1732  */
1733 __be32
1734 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1735                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1736                 struct svc_rqst *rqstp, int ignore_crossmnt)
1737 {
1738         u32 bmval0 = bmval[0];
1739         u32 bmval1 = bmval[1];
1740         u32 bmval2 = bmval[2];
1741         struct kstat stat;
1742         struct svc_fh tempfh;
1743         struct kstatfs statfs;
1744         int buflen = *countp << 2;
1745         __be32 *attrlenp;
1746         u32 dummy;
1747         u64 dummy64;
1748         u32 rdattr_err = 0;
1749         __be32 *p = buffer;
1750         __be32 status;
1751         int err;
1752         int aclsupport = 0;
1753         struct nfs4_acl *acl = NULL;
1754         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1755         u32 minorversion = resp->cstate.minorversion;
1756
1757         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1758         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1759         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1760         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1761
1762         if (exp->ex_fslocs.migrated) {
1763                 BUG_ON(bmval[2]);
1764                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1765                 if (status)
1766                         goto out;
1767         }
1768
1769         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1770         if (err)
1771                 goto out_nfserr;
1772         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1773                         FATTR4_WORD0_MAXNAME)) ||
1774             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1775                        FATTR4_WORD1_SPACE_TOTAL))) {
1776                 err = vfs_statfs(dentry, &statfs);
1777                 if (err)
1778                         goto out_nfserr;
1779         }
1780         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1781                 fh_init(&tempfh, NFS4_FHSIZE);
1782                 status = fh_compose(&tempfh, exp, dentry, NULL);
1783                 if (status)
1784                         goto out;
1785                 fhp = &tempfh;
1786         }
1787         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1788                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1789                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1790                 aclsupport = (err == 0);
1791                 if (bmval0 & FATTR4_WORD0_ACL) {
1792                         if (err == -EOPNOTSUPP)
1793                                 bmval0 &= ~FATTR4_WORD0_ACL;
1794                         else if (err == -EINVAL) {
1795                                 status = nfserr_attrnotsupp;
1796                                 goto out;
1797                         } else if (err != 0)
1798                                 goto out_nfserr;
1799                 }
1800         }
1801         if ((buflen -= 16) < 0)
1802                 goto out_resource;
1803
1804         if (unlikely(bmval2)) {
1805                 WRITE32(3);
1806                 WRITE32(bmval0);
1807                 WRITE32(bmval1);
1808                 WRITE32(bmval2);
1809         } else if (likely(bmval1)) {
1810                 WRITE32(2);
1811                 WRITE32(bmval0);
1812                 WRITE32(bmval1);
1813         } else {
1814                 WRITE32(1);
1815                 WRITE32(bmval0);
1816         }
1817         attrlenp = p++;                /* to be backfilled later */
1818
1819         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1820                 u32 word0 = nfsd_suppattrs0(minorversion);
1821                 u32 word1 = nfsd_suppattrs1(minorversion);
1822                 u32 word2 = nfsd_suppattrs2(minorversion);
1823
1824                 if ((buflen -= 12) < 0)
1825                         goto out_resource;
1826                 if (!aclsupport)
1827                         word0 &= ~FATTR4_WORD0_ACL;
1828                 if (!word2) {
1829                         WRITE32(2);
1830                         WRITE32(word0);
1831                         WRITE32(word1);
1832                 } else {
1833                         WRITE32(3);
1834                         WRITE32(word0);
1835                         WRITE32(word1);
1836                         WRITE32(word2);
1837                 }
1838         }
1839         if (bmval0 & FATTR4_WORD0_TYPE) {
1840                 if ((buflen -= 4) < 0)
1841                         goto out_resource;
1842                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1843                 if (dummy == NF4BAD)
1844                         goto out_serverfault;
1845                 WRITE32(dummy);
1846         }
1847         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1848                 if ((buflen -= 4) < 0)
1849                         goto out_resource;
1850                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1851                         WRITE32(NFS4_FH_PERSISTENT);
1852                 else
1853                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1854         }
1855         if (bmval0 & FATTR4_WORD0_CHANGE) {
1856                 if ((buflen -= 8) < 0)
1857                         goto out_resource;
1858                 write_change(&p, &stat, dentry->d_inode);
1859         }
1860         if (bmval0 & FATTR4_WORD0_SIZE) {
1861                 if ((buflen -= 8) < 0)
1862                         goto out_resource;
1863                 WRITE64(stat.size);
1864         }
1865         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1866                 if ((buflen -= 4) < 0)
1867                         goto out_resource;
1868                 WRITE32(1);
1869         }
1870         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1871                 if ((buflen -= 4) < 0)
1872                         goto out_resource;
1873                 WRITE32(1);
1874         }
1875         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1876                 if ((buflen -= 4) < 0)
1877                         goto out_resource;
1878                 WRITE32(0);
1879         }
1880         if (bmval0 & FATTR4_WORD0_FSID) {
1881                 if ((buflen -= 16) < 0)
1882                         goto out_resource;
1883                 if (exp->ex_fslocs.migrated) {
1884                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1885                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1886                 } else switch(fsid_source(fhp)) {
1887                 case FSIDSOURCE_FSID:
1888                         WRITE64((u64)exp->ex_fsid);
1889                         WRITE64((u64)0);
1890                         break;
1891                 case FSIDSOURCE_DEV:
1892                         WRITE32(0);
1893                         WRITE32(MAJOR(stat.dev));
1894                         WRITE32(0);
1895                         WRITE32(MINOR(stat.dev));
1896                         break;
1897                 case FSIDSOURCE_UUID:
1898                         WRITEMEM(exp->ex_uuid, 16);
1899                         break;
1900                 }
1901         }
1902         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1903                 if ((buflen -= 4) < 0)
1904                         goto out_resource;
1905                 WRITE32(0);
1906         }
1907         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1908                 if ((buflen -= 4) < 0)
1909                         goto out_resource;
1910                 WRITE32(NFSD_LEASE_TIME);
1911         }
1912         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1913                 if ((buflen -= 4) < 0)
1914                         goto out_resource;
1915                 WRITE32(rdattr_err);
1916         }
1917         if (bmval0 & FATTR4_WORD0_ACL) {
1918                 struct nfs4_ace *ace;
1919
1920                 if (acl == NULL) {
1921                         if ((buflen -= 4) < 0)
1922                                 goto out_resource;
1923
1924                         WRITE32(0);
1925                         goto out_acl;
1926                 }
1927                 if ((buflen -= 4) < 0)
1928                         goto out_resource;
1929                 WRITE32(acl->naces);
1930
1931                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1932                         if ((buflen -= 4*3) < 0)
1933                                 goto out_resource;
1934                         WRITE32(ace->type);
1935                         WRITE32(ace->flag);
1936                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1937                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1938                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1939                                 &p, &buflen);
1940                         if (status == nfserr_resource)
1941                                 goto out_resource;
1942                         if (status)
1943                                 goto out;
1944                 }
1945         }
1946 out_acl:
1947         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1948                 if ((buflen -= 4) < 0)
1949                         goto out_resource;
1950                 WRITE32(aclsupport ?
1951                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1952         }
1953         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1954                 if ((buflen -= 4) < 0)
1955                         goto out_resource;
1956                 WRITE32(1);
1957         }
1958         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1959                 if ((buflen -= 4) < 0)
1960                         goto out_resource;
1961                 WRITE32(1);
1962         }
1963         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1964                 if ((buflen -= 4) < 0)
1965                         goto out_resource;
1966                 WRITE32(1);
1967         }
1968         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1969                 if ((buflen -= 4) < 0)
1970                         goto out_resource;
1971                 WRITE32(1);
1972         }
1973         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1974                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1975                 if (buflen < 0)
1976                         goto out_resource;
1977                 WRITE32(fhp->fh_handle.fh_size);
1978                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1979         }
1980         if (bmval0 & FATTR4_WORD0_FILEID) {
1981                 if ((buflen -= 8) < 0)
1982                         goto out_resource;
1983                 WRITE64(stat.ino);
1984         }
1985         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1986                 if ((buflen -= 8) < 0)
1987                         goto out_resource;
1988                 WRITE64((u64) statfs.f_ffree);
1989         }
1990         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1991                 if ((buflen -= 8) < 0)
1992                         goto out_resource;
1993                 WRITE64((u64) statfs.f_ffree);
1994         }
1995         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1996                 if ((buflen -= 8) < 0)
1997                         goto out_resource;
1998                 WRITE64((u64) statfs.f_files);
1999         }
2000         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2001                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2002                 if (status == nfserr_resource)
2003                         goto out_resource;
2004                 if (status)
2005                         goto out;
2006         }
2007         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2008                 if ((buflen -= 4) < 0)
2009                         goto out_resource;
2010                 WRITE32(1);
2011         }
2012         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2013                 if ((buflen -= 8) < 0)
2014                         goto out_resource;
2015                 WRITE64(~(u64)0);
2016         }
2017         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2018                 if ((buflen -= 4) < 0)
2019                         goto out_resource;
2020                 WRITE32(255);
2021         }
2022         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2023                 if ((buflen -= 4) < 0)
2024                         goto out_resource;
2025                 WRITE32(statfs.f_namelen);
2026         }
2027         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2028                 if ((buflen -= 8) < 0)
2029                         goto out_resource;
2030                 WRITE64((u64) svc_max_payload(rqstp));
2031         }
2032         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2033                 if ((buflen -= 8) < 0)
2034                         goto out_resource;
2035                 WRITE64((u64) svc_max_payload(rqstp));
2036         }
2037         if (bmval1 & FATTR4_WORD1_MODE) {
2038                 if ((buflen -= 4) < 0)
2039                         goto out_resource;
2040                 WRITE32(stat.mode & S_IALLUGO);
2041         }
2042         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2043                 if ((buflen -= 4) < 0)
2044                         goto out_resource;
2045                 WRITE32(1);
2046         }
2047         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2048                 if ((buflen -= 4) < 0)
2049                         goto out_resource;
2050                 WRITE32(stat.nlink);
2051         }
2052         if (bmval1 & FATTR4_WORD1_OWNER) {
2053                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2054                 if (status == nfserr_resource)
2055                         goto out_resource;
2056                 if (status)
2057                         goto out;
2058         }
2059         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2060                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2061                 if (status == nfserr_resource)
2062                         goto out_resource;
2063                 if (status)
2064                         goto out;
2065         }
2066         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2067                 if ((buflen -= 8) < 0)
2068                         goto out_resource;
2069                 WRITE32((u32) MAJOR(stat.rdev));
2070                 WRITE32((u32) MINOR(stat.rdev));
2071         }
2072         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2073                 if ((buflen -= 8) < 0)
2074                         goto out_resource;
2075                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2076                 WRITE64(dummy64);
2077         }
2078         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2079                 if ((buflen -= 8) < 0)
2080                         goto out_resource;
2081                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2082                 WRITE64(dummy64);
2083         }
2084         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2085                 if ((buflen -= 8) < 0)
2086                         goto out_resource;
2087                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2088                 WRITE64(dummy64);
2089         }
2090         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2091                 if ((buflen -= 8) < 0)
2092                         goto out_resource;
2093                 dummy64 = (u64)stat.blocks << 9;
2094                 WRITE64(dummy64);
2095         }
2096         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2097                 if ((buflen -= 12) < 0)
2098                         goto out_resource;
2099                 WRITE32(0);
2100                 WRITE32(stat.atime.tv_sec);
2101                 WRITE32(stat.atime.tv_nsec);
2102         }
2103         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2104                 if ((buflen -= 12) < 0)
2105                         goto out_resource;
2106                 WRITE32(0);
2107                 WRITE32(1);
2108                 WRITE32(0);
2109         }
2110         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2111                 if ((buflen -= 12) < 0)
2112                         goto out_resource;
2113                 WRITE32(0);
2114                 WRITE32(stat.ctime.tv_sec);
2115                 WRITE32(stat.ctime.tv_nsec);
2116         }
2117         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2118                 if ((buflen -= 12) < 0)
2119                         goto out_resource;
2120                 WRITE32(0);
2121                 WRITE32(stat.mtime.tv_sec);
2122                 WRITE32(stat.mtime.tv_nsec);
2123         }
2124         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2125                 if ((buflen -= 8) < 0)
2126                         goto out_resource;
2127                 /*
2128                  * Get parent's attributes if not ignoring crossmount
2129                  * and this is the root of a cross-mounted filesystem.
2130                  */
2131                 if (ignore_crossmnt == 0 &&
2132                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
2133                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
2134                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
2135                         if (err)
2136                                 goto out_nfserr;
2137                 }
2138                 WRITE64(stat.ino);
2139         }
2140         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2141                 WRITE32(3);
2142                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2143                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2144                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2145         }
2146
2147         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2148         *countp = p - buffer;
2149         status = nfs_ok;
2150
2151 out:
2152         kfree(acl);
2153         if (fhp == &tempfh)
2154                 fh_put(&tempfh);
2155         return status;
2156 out_nfserr:
2157         status = nfserrno(err);
2158         goto out;
2159 out_resource:
2160         *countp = 0;
2161         status = nfserr_resource;
2162         goto out;
2163 out_serverfault:
2164         status = nfserr_serverfault;
2165         goto out;
2166 }
2167
2168 static inline int attributes_need_mount(u32 *bmval)
2169 {
2170         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2171                 return 1;
2172         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2173                 return 1;
2174         return 0;
2175 }
2176
2177 static __be32
2178 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2179                 const char *name, int namlen, __be32 *p, int *buflen)
2180 {
2181         struct svc_export *exp = cd->rd_fhp->fh_export;
2182         struct dentry *dentry;
2183         __be32 nfserr;
2184         int ignore_crossmnt = 0;
2185
2186         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2187         if (IS_ERR(dentry))
2188                 return nfserrno(PTR_ERR(dentry));
2189         if (!dentry->d_inode) {
2190                 /*
2191                  * nfsd_buffered_readdir drops the i_mutex between
2192                  * readdir and calling this callback, leaving a window
2193                  * where this directory entry could have gone away.
2194                  */
2195                 dput(dentry);
2196                 return nfserr_noent;
2197         }
2198
2199         exp_get(exp);
2200         /*
2201          * In the case of a mountpoint, the client may be asking for
2202          * attributes that are only properties of the underlying filesystem
2203          * as opposed to the cross-mounted file system. In such a case,
2204          * we will not follow the cross mount and will fill the attribtutes
2205          * directly from the mountpoint dentry.
2206          */
2207         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
2208                 ignore_crossmnt = 1;
2209         else if (d_mountpoint(dentry)) {
2210                 int err;
2211
2212                 /*
2213                  * Why the heck aren't we just using nfsd_lookup??
2214                  * Different "."/".." handling?  Something else?
2215                  * At least, add a comment here to explain....
2216                  */
2217                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2218                 if (err) {
2219                         nfserr = nfserrno(err);
2220                         goto out_put;
2221                 }
2222                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2223                 if (nfserr)
2224                         goto out_put;
2225
2226         }
2227         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2228                                         cd->rd_rqstp, ignore_crossmnt);
2229 out_put:
2230         dput(dentry);
2231         exp_put(exp);
2232         return nfserr;
2233 }
2234
2235 static __be32 *
2236 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2237 {
2238         __be32 *attrlenp;
2239
2240         if (buflen < 6)
2241                 return NULL;
2242         *p++ = htonl(2);
2243         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2244         *p++ = htonl(0);                         /* bmval1 */
2245
2246         attrlenp = p++;
2247         *p++ = nfserr;       /* no htonl */
2248         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2249         return p;
2250 }
2251
2252 static int
2253 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2254                     loff_t offset, u64 ino, unsigned int d_type)
2255 {
2256         struct readdir_cd *ccd = ccdv;
2257         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2258         int buflen;
2259         __be32 *p = cd->buffer;
2260         __be32 *cookiep;
2261         __be32 nfserr = nfserr_toosmall;
2262
2263         /* In nfsv4, "." and ".." never make it onto the wire.. */
2264         if (name && isdotent(name, namlen)) {
2265                 cd->common.err = nfs_ok;
2266                 return 0;
2267         }
2268
2269         if (cd->offset)
2270                 xdr_encode_hyper(cd->offset, (u64) offset);
2271
2272         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2273         if (buflen < 0)
2274                 goto fail;
2275
2276         *p++ = xdr_one;                             /* mark entry present */
2277         cookiep = p;
2278         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2279         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2280
2281         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2282         switch (nfserr) {
2283         case nfs_ok:
2284                 p += buflen;
2285                 break;
2286         case nfserr_resource:
2287                 nfserr = nfserr_toosmall;
2288                 goto fail;
2289         case nfserr_dropit:
2290                 goto fail;
2291         case nfserr_noent:
2292                 goto skip_entry;
2293         default:
2294                 /*
2295                  * If the client requested the RDATTR_ERROR attribute,
2296                  * we stuff the error code into this attribute
2297                  * and continue.  If this attribute was not requested,
2298                  * then in accordance with the spec, we fail the
2299                  * entire READDIR operation(!)
2300                  */
2301                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2302                         goto fail;
2303                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2304                 if (p == NULL) {
2305                         nfserr = nfserr_toosmall;
2306                         goto fail;
2307                 }
2308         }
2309         cd->buflen -= (p - cd->buffer);
2310         cd->buffer = p;
2311         cd->offset = cookiep;
2312 skip_entry:
2313         cd->common.err = nfs_ok;
2314         return 0;
2315 fail:
2316         cd->common.err = nfserr;
2317         return -EINVAL;
2318 }
2319
2320 static void
2321 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2322 {
2323         __be32 *p;
2324
2325         RESERVE_SPACE(sizeof(stateid_t));
2326         WRITE32(sid->si_generation);
2327         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2328         ADJUST_ARGS();
2329 }
2330
2331 static __be32
2332 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2333 {
2334         __be32 *p;
2335
2336         if (!nfserr) {
2337                 RESERVE_SPACE(8);
2338                 WRITE32(access->ac_supported);
2339                 WRITE32(access->ac_resp_access);
2340                 ADJUST_ARGS();
2341         }
2342         return nfserr;
2343 }
2344
2345 static __be32
2346 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2347 {
2348         ENCODE_SEQID_OP_HEAD;
2349
2350         if (!nfserr)
2351                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2352
2353         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2354         return nfserr;
2355 }
2356
2357
2358 static __be32
2359 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2360 {
2361         __be32 *p;
2362
2363         if (!nfserr) {
2364                 RESERVE_SPACE(8);
2365                 WRITEMEM(commit->co_verf.data, 8);
2366                 ADJUST_ARGS();
2367         }
2368         return nfserr;
2369 }
2370
2371 static __be32
2372 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2373 {
2374         __be32 *p;
2375
2376         if (!nfserr) {
2377                 RESERVE_SPACE(32);
2378                 write_cinfo(&p, &create->cr_cinfo);
2379                 WRITE32(2);
2380                 WRITE32(create->cr_bmval[0]);
2381                 WRITE32(create->cr_bmval[1]);
2382                 ADJUST_ARGS();
2383         }
2384         return nfserr;
2385 }
2386
2387 static __be32
2388 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2389 {
2390         struct svc_fh *fhp = getattr->ga_fhp;
2391         int buflen;
2392
2393         if (nfserr)
2394                 return nfserr;
2395
2396         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2397         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2398                                     resp->p, &buflen, getattr->ga_bmval,
2399                                     resp->rqstp, 0);
2400         if (!nfserr)
2401                 resp->p += buflen;
2402         return nfserr;
2403 }
2404
2405 static __be32
2406 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2407 {
2408         struct svc_fh *fhp = *fhpp;
2409         unsigned int len;
2410         __be32 *p;
2411
2412         if (!nfserr) {
2413                 len = fhp->fh_handle.fh_size;
2414                 RESERVE_SPACE(len + 4);
2415                 WRITE32(len);
2416                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2417                 ADJUST_ARGS();
2418         }
2419         return nfserr;
2420 }
2421
2422 /*
2423 * Including all fields other than the name, a LOCK4denied structure requires
2424 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2425 */
2426 static void
2427 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2428 {
2429         __be32 *p;
2430
2431         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2432         WRITE64(ld->ld_start);
2433         WRITE64(ld->ld_length);
2434         WRITE32(ld->ld_type);
2435         if (ld->ld_sop) {
2436                 WRITEMEM(&ld->ld_clientid, 8);
2437                 WRITE32(ld->ld_sop->so_owner.len);
2438                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2439                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2440         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2441                 WRITE64((u64)0); /* clientid */
2442                 WRITE32(0); /* length of owner name */
2443         }
2444         ADJUST_ARGS();
2445 }
2446
2447 static __be32
2448 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2449 {
2450         ENCODE_SEQID_OP_HEAD;
2451
2452         if (!nfserr)
2453                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2454         else if (nfserr == nfserr_denied)
2455                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2456
2457         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2458         return nfserr;
2459 }
2460
2461 static __be32
2462 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2463 {
2464         if (nfserr == nfserr_denied)
2465                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2466         return nfserr;
2467 }
2468
2469 static __be32
2470 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2471 {
2472         ENCODE_SEQID_OP_HEAD;
2473
2474         if (!nfserr)
2475                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2476
2477         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2478         return nfserr;
2479 }
2480
2481
2482 static __be32
2483 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2484 {
2485         __be32 *p;
2486
2487         if (!nfserr) {
2488                 RESERVE_SPACE(20);
2489                 write_cinfo(&p, &link->li_cinfo);
2490                 ADJUST_ARGS();
2491         }
2492         return nfserr;
2493 }
2494
2495
2496 static __be32
2497 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2498 {
2499         __be32 *p;
2500         ENCODE_SEQID_OP_HEAD;
2501
2502         if (nfserr)
2503                 goto out;
2504
2505         nfsd4_encode_stateid(resp, &open->op_stateid);
2506         RESERVE_SPACE(40);
2507         write_cinfo(&p, &open->op_cinfo);
2508         WRITE32(open->op_rflags);
2509         WRITE32(2);
2510         WRITE32(open->op_bmval[0]);
2511         WRITE32(open->op_bmval[1]);
2512         WRITE32(open->op_delegate_type);
2513         ADJUST_ARGS();
2514
2515         switch (open->op_delegate_type) {
2516         case NFS4_OPEN_DELEGATE_NONE:
2517                 break;
2518         case NFS4_OPEN_DELEGATE_READ:
2519                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2520                 RESERVE_SPACE(20);
2521                 WRITE32(open->op_recall);
2522
2523                 /*
2524                  * TODO: ACE's in delegations
2525                  */
2526                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2527                 WRITE32(0);
2528                 WRITE32(0);
2529                 WRITE32(0);   /* XXX: is NULL principal ok? */
2530                 ADJUST_ARGS();
2531                 break;
2532         case NFS4_OPEN_DELEGATE_WRITE:
2533                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2534                 RESERVE_SPACE(32);
2535                 WRITE32(0);
2536
2537                 /*
2538                  * TODO: space_limit's in delegations
2539                  */
2540                 WRITE32(NFS4_LIMIT_SIZE);
2541                 WRITE32(~(u32)0);
2542                 WRITE32(~(u32)0);
2543
2544                 /*
2545                  * TODO: ACE's in delegations
2546                  */
2547                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2548                 WRITE32(0);
2549                 WRITE32(0);
2550                 WRITE32(0);   /* XXX: is NULL principal ok? */
2551                 ADJUST_ARGS();
2552                 break;
2553         default:
2554                 BUG();
2555         }
2556         /* XXX save filehandle here */
2557 out:
2558         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2559         return nfserr;
2560 }
2561
2562 static __be32
2563 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2564 {
2565         ENCODE_SEQID_OP_HEAD;
2566
2567         if (!nfserr)
2568                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2569
2570         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2571         return nfserr;
2572 }
2573
2574 static __be32
2575 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2576 {
2577         ENCODE_SEQID_OP_HEAD;
2578
2579         if (!nfserr)
2580                 nfsd4_encode_stateid(resp, &od->od_stateid);
2581
2582         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2583         return nfserr;
2584 }
2585
2586 static __be32
2587 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2588                   struct nfsd4_read *read)
2589 {
2590         u32 eof;
2591         int v, pn;
2592         unsigned long maxcount;
2593         long len;
2594         __be32 *p;
2595
2596         if (nfserr)
2597                 return nfserr;
2598         if (resp->xbuf->page_len)
2599                 return nfserr_resource;
2600
2601         RESERVE_SPACE(8); /* eof flag and byte count */
2602
2603         maxcount = svc_max_payload(resp->rqstp);
2604         if (maxcount > read->rd_length)
2605                 maxcount = read->rd_length;
2606
2607         len = maxcount;
2608         v = 0;
2609         while (len > 0) {
2610                 pn = resp->rqstp->rq_resused++;
2611                 resp->rqstp->rq_vec[v].iov_base =
2612                         page_address(resp->rqstp->rq_respages[pn]);
2613                 resp->rqstp->rq_vec[v].iov_len =
2614                         len < PAGE_SIZE ? len : PAGE_SIZE;
2615                 v++;
2616                 len -= PAGE_SIZE;
2617         }
2618         read->rd_vlen = v;
2619
2620         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2621                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2622                         &maxcount);
2623
2624         if (nfserr == nfserr_symlink)
2625                 nfserr = nfserr_inval;
2626         if (nfserr)
2627                 return nfserr;
2628         eof = (read->rd_offset + maxcount >=
2629                read->rd_fhp->fh_dentry->d_inode->i_size);
2630
2631         WRITE32(eof);
2632         WRITE32(maxcount);
2633         ADJUST_ARGS();
2634         resp->xbuf->head[0].iov_len = (char*)p
2635                                         - (char*)resp->xbuf->head[0].iov_base;
2636         resp->xbuf->page_len = maxcount;
2637
2638         /* Use rest of head for padding and remaining ops: */
2639         resp->xbuf->tail[0].iov_base = p;
2640         resp->xbuf->tail[0].iov_len = 0;
2641         if (maxcount&3) {
2642                 RESERVE_SPACE(4);
2643                 WRITE32(0);
2644                 resp->xbuf->tail[0].iov_base += maxcount&3;
2645                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2646                 ADJUST_ARGS();
2647         }
2648         return 0;
2649 }
2650
2651 static __be32
2652 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2653 {
2654         int maxcount;
2655         char *page;
2656         __be32 *p;
2657
2658         if (nfserr)
2659                 return nfserr;
2660         if (resp->xbuf->page_len)
2661                 return nfserr_resource;
2662
2663         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2664
2665         maxcount = PAGE_SIZE;
2666         RESERVE_SPACE(4);
2667
2668         /*
2669          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2670          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2671          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2672          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2673          */
2674         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2675         if (nfserr == nfserr_isdir)
2676                 return nfserr_inval;
2677         if (nfserr)
2678                 return nfserr;
2679
2680         WRITE32(maxcount);
2681         ADJUST_ARGS();
2682         resp->xbuf->head[0].iov_len = (char*)p
2683                                 - (char*)resp->xbuf->head[0].iov_base;
2684         resp->xbuf->page_len = maxcount;
2685
2686         /* Use rest of head for padding and remaining ops: */
2687         resp->xbuf->tail[0].iov_base = p;
2688         resp->xbuf->tail[0].iov_len = 0;
2689         if (maxcount&3) {
2690                 RESERVE_SPACE(4);
2691                 WRITE32(0);
2692                 resp->xbuf->tail[0].iov_base += maxcount&3;
2693                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2694                 ADJUST_ARGS();
2695         }
2696         return 0;
2697 }
2698
2699 static __be32
2700 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2701 {
2702         int maxcount;
2703         loff_t offset;
2704         __be32 *page, *savep, *tailbase;
2705         __be32 *p;
2706
2707         if (nfserr)
2708                 return nfserr;
2709         if (resp->xbuf->page_len)
2710                 return nfserr_resource;
2711
2712         RESERVE_SPACE(8);  /* verifier */
2713         savep = p;
2714
2715         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2716         WRITE32(0);
2717         WRITE32(0);
2718         ADJUST_ARGS();
2719         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2720         tailbase = p;
2721
2722         maxcount = PAGE_SIZE;
2723         if (maxcount > readdir->rd_maxcount)
2724                 maxcount = readdir->rd_maxcount;
2725
2726         /*
2727          * Convert from bytes to words, account for the two words already
2728          * written, make sure to leave two words at the end for the next
2729          * pointer and eof field.
2730          */
2731         maxcount = (maxcount >> 2) - 4;
2732         if (maxcount < 0) {
2733                 nfserr =  nfserr_toosmall;
2734                 goto err_no_verf;
2735         }
2736
2737         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2738         readdir->common.err = 0;
2739         readdir->buflen = maxcount;
2740         readdir->buffer = page;
2741         readdir->offset = NULL;
2742
2743         offset = readdir->rd_cookie;
2744         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2745                               &offset,
2746                               &readdir->common, nfsd4_encode_dirent);
2747         if (nfserr == nfs_ok &&
2748             readdir->common.err == nfserr_toosmall &&
2749             readdir->buffer == page)
2750                 nfserr = nfserr_toosmall;
2751         if (nfserr == nfserr_symlink)
2752                 nfserr = nfserr_notdir;
2753         if (nfserr)
2754                 goto err_no_verf;
2755
2756         if (readdir->offset)
2757                 xdr_encode_hyper(readdir->offset, offset);
2758
2759         p = readdir->buffer;
2760         *p++ = 0;       /* no more entries */
2761         *p++ = htonl(readdir->common.err == nfserr_eof);
2762         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2763                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2764
2765         /* Use rest of head for padding and remaining ops: */
2766         resp->xbuf->tail[0].iov_base = tailbase;
2767         resp->xbuf->tail[0].iov_len = 0;
2768         resp->p = resp->xbuf->tail[0].iov_base;
2769         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2770
2771         return 0;
2772 err_no_verf:
2773         p = savep;
2774         ADJUST_ARGS();
2775         return nfserr;
2776 }
2777
2778 static __be32
2779 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2780 {
2781         __be32 *p;
2782
2783         if (!nfserr) {
2784                 RESERVE_SPACE(20);
2785                 write_cinfo(&p, &remove->rm_cinfo);
2786                 ADJUST_ARGS();
2787         }
2788         return nfserr;
2789 }
2790
2791 static __be32
2792 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2793 {
2794         __be32 *p;
2795
2796         if (!nfserr) {
2797                 RESERVE_SPACE(40);
2798                 write_cinfo(&p, &rename->rn_sinfo);
2799                 write_cinfo(&p, &rename->rn_tinfo);
2800                 ADJUST_ARGS();
2801         }
2802         return nfserr;
2803 }
2804
2805 static __be32
2806 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2807                      struct nfsd4_secinfo *secinfo)
2808 {
2809         int i = 0;
2810         struct svc_export *exp = secinfo->si_exp;
2811         u32 nflavs;
2812         struct exp_flavor_info *flavs;
2813         struct exp_flavor_info def_flavs[2];
2814         __be32 *p;
2815
2816         if (nfserr)
2817                 goto out;
2818         if (exp->ex_nflavors) {
2819                 flavs = exp->ex_flavors;
2820                 nflavs = exp->ex_nflavors;
2821         } else { /* Handling of some defaults in absence of real secinfo: */
2822                 flavs = def_flavs;
2823                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2824                         nflavs = 2;
2825                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2826                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2827                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2828                         nflavs = 1;
2829                         flavs[0].pseudoflavor
2830                                         = svcauth_gss_flavor(exp->ex_client);
2831                 } else {
2832                         nflavs = 1;
2833                         flavs[0].pseudoflavor
2834                                         = exp->ex_client->flavour->flavour;
2835                 }
2836         }
2837
2838         RESERVE_SPACE(4);
2839         WRITE32(nflavs);
2840         ADJUST_ARGS();
2841         for (i = 0; i < nflavs; i++) {
2842                 u32 flav = flavs[i].pseudoflavor;
2843                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2844
2845                 if (gm) {
2846                         RESERVE_SPACE(4);
2847                         WRITE32(RPC_AUTH_GSS);
2848                         ADJUST_ARGS();
2849                         RESERVE_SPACE(4 + gm->gm_oid.len);
2850                         WRITE32(gm->gm_oid.len);
2851                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2852                         ADJUST_ARGS();
2853                         RESERVE_SPACE(4);
2854                         WRITE32(0); /* qop */
2855                         ADJUST_ARGS();
2856                         RESERVE_SPACE(4);
2857                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2858                         ADJUST_ARGS();
2859                         gss_mech_put(gm);
2860                 } else {
2861                         RESERVE_SPACE(4);
2862                         WRITE32(flav);
2863                         ADJUST_ARGS();
2864                 }
2865         }
2866 out:
2867         if (exp)
2868                 exp_put(exp);
2869         return nfserr;
2870 }
2871
2872 /*
2873  * The SETATTR encode routine is special -- it always encodes a bitmap,
2874  * regardless of the error status.
2875  */
2876 static __be32
2877 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2878 {
2879         __be32 *p;
2880
2881         RESERVE_SPACE(12);
2882         if (nfserr) {
2883                 WRITE32(2);
2884                 WRITE32(0);
2885                 WRITE32(0);
2886         }
2887         else {
2888                 WRITE32(2);
2889                 WRITE32(setattr->sa_bmval[0]);
2890                 WRITE32(setattr->sa_bmval[1]);
2891         }
2892         ADJUST_ARGS();
2893         return nfserr;
2894 }
2895
2896 static __be32
2897 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2898 {
2899         __be32 *p;
2900
2901         if (!nfserr) {
2902                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2903                 WRITEMEM(&scd->se_clientid, 8);
2904                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2905                 ADJUST_ARGS();
2906         }
2907         else if (nfserr == nfserr_clid_inuse) {
2908                 RESERVE_SPACE(8);
2909                 WRITE32(0);
2910                 WRITE32(0);
2911                 ADJUST_ARGS();
2912         }
2913         return nfserr;
2914 }
2915
2916 static __be32
2917 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2918 {
2919         __be32 *p;
2920
2921         if (!nfserr) {
2922                 RESERVE_SPACE(16);
2923                 WRITE32(write->wr_bytes_written);
2924                 WRITE32(write->wr_how_written);
2925                 WRITEMEM(write->wr_verifier.data, 8);
2926                 ADJUST_ARGS();
2927         }
2928         return nfserr;
2929 }
2930
2931 static __be32
2932 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2933                          struct nfsd4_exchange_id *exid)
2934 {
2935         __be32 *p;
2936         char *major_id;
2937         char *server_scope;
2938         int major_id_sz;
2939         int server_scope_sz;
2940         uint64_t minor_id = 0;
2941
2942         if (nfserr)
2943                 return nfserr;
2944
2945         major_id = utsname()->nodename;
2946         major_id_sz = strlen(major_id);
2947         server_scope = utsname()->nodename;
2948         server_scope_sz = strlen(server_scope);
2949
2950         RESERVE_SPACE(
2951                 8 /* eir_clientid */ +
2952                 4 /* eir_sequenceid */ +
2953                 4 /* eir_flags */ +
2954                 4 /* spr_how (SP4_NONE) */ +
2955                 8 /* so_minor_id */ +
2956                 4 /* so_major_id.len */ +
2957                 (XDR_QUADLEN(major_id_sz) * 4) +
2958                 4 /* eir_server_scope.len */ +
2959                 (XDR_QUADLEN(server_scope_sz) * 4) +
2960                 4 /* eir_server_impl_id.count (0) */);
2961
2962         WRITEMEM(&exid->clientid, 8);
2963         WRITE32(exid->seqid);
2964         WRITE32(exid->flags);
2965
2966         /* state_protect4_r. Currently only support SP4_NONE */
2967         BUG_ON(exid->spa_how != SP4_NONE);
2968         WRITE32(exid->spa_how);
2969
2970         /* The server_owner struct */
2971         WRITE64(minor_id);      /* Minor id */
2972         /* major id */
2973         WRITE32(major_id_sz);
2974         WRITEMEM(major_id, major_id_sz);
2975
2976         /* Server scope */
2977         WRITE32(server_scope_sz);
2978         WRITEMEM(server_scope, server_scope_sz);
2979
2980         /* Implementation id */
2981         WRITE32(0);     /* zero length nfs_impl_id4 array */
2982         ADJUST_ARGS();
2983         return 0;
2984 }
2985
2986 static __be32
2987 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
2988                             struct nfsd4_create_session *sess)
2989 {
2990         __be32 *p;
2991
2992         if (nfserr)
2993                 return nfserr;
2994
2995         RESERVE_SPACE(24);
2996         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2997         WRITE32(sess->seqid);
2998         WRITE32(sess->flags);
2999         ADJUST_ARGS();
3000
3001         RESERVE_SPACE(28);
3002         WRITE32(0); /* headerpadsz */
3003         WRITE32(sess->fore_channel.maxreq_sz);
3004         WRITE32(sess->fore_channel.maxresp_sz);
3005         WRITE32(sess->fore_channel.maxresp_cached);
3006         WRITE32(sess->fore_channel.maxops);
3007         WRITE32(sess->fore_channel.maxreqs);
3008         WRITE32(sess->fore_channel.nr_rdma_attrs);
3009         ADJUST_ARGS();
3010
3011         if (sess->fore_channel.nr_rdma_attrs) {
3012                 RESERVE_SPACE(4);
3013                 WRITE32(sess->fore_channel.rdma_attrs);
3014                 ADJUST_ARGS();
3015         }
3016
3017         RESERVE_SPACE(28);
3018         WRITE32(0); /* headerpadsz */
3019         WRITE32(sess->back_channel.maxreq_sz);
3020         WRITE32(sess->back_channel.maxresp_sz);
3021         WRITE32(sess->back_channel.maxresp_cached);
3022         WRITE32(sess->back_channel.maxops);
3023         WRITE32(sess->back_channel.maxreqs);
3024         WRITE32(sess->back_channel.nr_rdma_attrs);
3025         ADJUST_ARGS();
3026
3027         if (sess->back_channel.nr_rdma_attrs) {
3028                 RESERVE_SPACE(4);
3029                 WRITE32(sess->back_channel.rdma_attrs);
3030                 ADJUST_ARGS();
3031         }
3032         return 0;
3033 }
3034
3035 static __be32
3036 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3037                              struct nfsd4_destroy_session *destroy_session)
3038 {
3039         return nfserr;
3040 }
3041
3042 __be32
3043 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3044                       struct nfsd4_sequence *seq)
3045 {
3046         __be32 *p;
3047
3048         if (nfserr)
3049                 return nfserr;
3050
3051         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3052         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3053         WRITE32(seq->seqid);
3054         WRITE32(seq->slotid);
3055         WRITE32(seq->maxslots);
3056         /*
3057          * FIXME: for now:
3058          *   target_maxslots = maxslots
3059          *   status_flags = 0
3060          */
3061         WRITE32(seq->maxslots);
3062         WRITE32(0);
3063
3064         ADJUST_ARGS();
3065         resp->cstate.datap = p; /* DRC cache data pointer */
3066         return 0;
3067 }
3068
3069 static __be32
3070 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3071 {
3072         return nfserr;
3073 }
3074
3075 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3076
3077 /*
3078  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3079  * since we don't need to filter out obsolete ops as this is
3080  * done in the decoding phase.
3081  */
3082 static nfsd4_enc nfsd4_enc_ops[] = {
3083         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3084         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3085         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3086         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3087         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3088         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3089         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3090         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3091         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3092         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3093         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3094         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3095         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3096         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3097         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3098         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3099         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3100         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3101         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3102         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3103         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3104         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3105         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3106         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3107         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3108         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3109         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3110         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3111         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3112         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3113         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3114         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3115         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3116         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3117         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3118         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3119         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3120
3121         /* NFSv4.1 operations */
3122         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3123         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3124         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3125         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3126         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3127         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3128         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3129         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3130         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3131         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3132         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3133         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3134         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
3135         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3136         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3137         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3138         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3139         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3140         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3141 };
3142
3143 /*
3144  * Calculate the total amount of memory that the compound response has taken
3145  * after encoding the current operation.
3146  *
3147  * pad: add on 8 bytes for the next operation's op_code and status so that
3148  * there is room to cache a failure on the next operation.
3149  *
3150  * Compare this length to the session se_fmaxresp_cached.
3151  *
3152  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3153  * will be at least a page and will therefore hold the xdr_buf head.
3154  */
3155 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3156 {
3157         int status = 0;
3158         struct xdr_buf *xb = &resp->rqstp->rq_res;
3159         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3160         struct nfsd4_session *session = NULL;
3161         struct nfsd4_slot *slot = resp->cstate.slot;
3162         u32 length, tlen = 0, pad = 8;
3163
3164         if (!nfsd4_has_session(&resp->cstate))
3165                 return status;
3166
3167         session = resp->cstate.session;
3168         if (session == NULL || slot->sl_cachethis == 0)
3169                 return status;
3170
3171         if (resp->opcnt >= args->opcnt)
3172                 pad = 0; /* this is the last operation */
3173
3174         if (xb->page_len == 0) {
3175                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3176         } else {
3177                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3178                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3179
3180                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3181         }
3182         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3183                 length, xb->page_len, tlen, pad);
3184
3185         if (length <= session->se_fchannel.maxresp_cached)
3186                 return status;
3187         else
3188                 return nfserr_rep_too_big_to_cache;
3189 }
3190
3191 void
3192 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3193 {
3194         __be32 *statp;
3195         __be32 *p;
3196
3197         RESERVE_SPACE(8);
3198         WRITE32(op->opnum);
3199         statp = p++;    /* to be backfilled at the end */
3200         ADJUST_ARGS();
3201
3202         if (op->opnum == OP_ILLEGAL)
3203                 goto status;
3204         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3205                !nfsd4_enc_ops[op->opnum]);
3206         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3207         /* nfsd4_check_drc_limit guarantees enough room for error status */
3208         if (!op->status && nfsd4_check_drc_limit(resp))
3209                 op->status = nfserr_rep_too_big_to_cache;
3210 status:
3211         /*
3212          * Note: We write the status directly, instead of using WRITE32(),
3213          * since it is already in network byte order.
3214          */
3215         *statp = op->status;
3216 }
3217
3218 /*
3219  * Encode the reply stored in the stateowner reply cache
3220  *
3221  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3222  * previously sent already encoded operation.
3223  *
3224  * called with nfs4_lock_state() held
3225  */
3226 void
3227 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3228 {
3229         __be32 *p;
3230         struct nfs4_replay *rp = op->replay;
3231
3232         BUG_ON(!rp);
3233
3234         RESERVE_SPACE(8);
3235         WRITE32(op->opnum);
3236         *p++ = rp->rp_status;  /* already xdr'ed */
3237         ADJUST_ARGS();
3238
3239         RESERVE_SPACE(rp->rp_buflen);
3240         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3241         ADJUST_ARGS();
3242 }
3243
3244 int
3245 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3246 {
3247         return xdr_ressize_check(rqstp, p);
3248 }
3249
3250 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3251 {
3252         if (args->ops != args->iops) {
3253                 kfree(args->ops);
3254                 args->ops = args->iops;
3255         }
3256         kfree(args->tmpp);
3257         args->tmpp = NULL;
3258         while (args->to_free) {
3259                 struct tmpbuf *tb = args->to_free;
3260                 args->to_free = tb->next;
3261                 tb->release(tb->buf);
3262                 kfree(tb);
3263         }
3264 }
3265
3266 int
3267 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3268 {
3269         __be32 status;
3270
3271         args->p = p;
3272         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3273         args->pagelist = rqstp->rq_arg.pages;
3274         args->pagelen = rqstp->rq_arg.page_len;
3275         args->tmpp = NULL;
3276         args->to_free = NULL;
3277         args->ops = args->iops;
3278         args->rqstp = rqstp;
3279
3280         status = nfsd4_decode_compound(args);
3281         if (status) {
3282                 nfsd4_release_compoundargs(args);
3283         }
3284         return !status;
3285 }
3286
3287 int
3288 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3289 {
3290         /*
3291          * All that remains is to write the tag and operation count...
3292          */
3293         struct nfsd4_compound_state *cs = &resp->cstate;
3294         struct kvec *iov;
3295         p = resp->tagp;
3296         *p++ = htonl(resp->taglen);
3297         memcpy(p, resp->tag, resp->taglen);
3298         p += XDR_QUADLEN(resp->taglen);
3299         *p++ = htonl(resp->opcnt);
3300
3301         if (rqstp->rq_res.page_len)
3302                 iov = &rqstp->rq_res.tail[0];
3303         else
3304                 iov = &rqstp->rq_res.head[0];
3305         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3306         BUG_ON(iov->iov_len > PAGE_SIZE);
3307         if (nfsd4_has_session(cs) && cs->status != nfserr_replay_cache) {
3308                 nfsd4_store_cache_entry(resp);
3309                 dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3310                 resp->cstate.slot->sl_inuse = false;
3311                 nfsd4_put_session(resp->cstate.session);
3312         }
3313         return 1;
3314 }
3315
3316 /*
3317  * Local variables:
3318  *  c-basic-offset: 8
3319  * End:
3320  */