fs/nfsd/nfs4xdr.c

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