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, tmp;
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(tmp);
1057                 while (tmp--) {
1058                         READ_BUF(4);
1059                         READ32(dummy);
1060                         READ_BUF(dummy);
1061                         p += XDR_QUADLEN(dummy);
1062                 }
1063
1064                 /* ssp_encr_algs<> */
1065                 READ_BUF(4);
1066                 READ32(tmp);
1067                 while (tmp--) {
1068                         READ_BUF(4);
1069                         READ32(dummy);
1070                         READ_BUF(dummy);
1071                         p += XDR_QUADLEN(dummy);
1072                 }
1073
1074                 /* ssp_window and ssp_num_gss_handles */
1075                 READ_BUF(8);
1076                 READ32(dummy);
1077                 READ32(dummy);
1078                 break;
1079         default:
1080                 goto xdr_error;
1081         }
1082
1083         /* Ignore Implementation ID */
1084         READ_BUF(4);    /* nfs_impl_id4 array length */
1085         READ32(dummy);
1086
1087         if (dummy > 1)
1088                 goto xdr_error;
1089
1090         if (dummy == 1) {
1091                 /* nii_domain */
1092                 READ_BUF(4);
1093                 READ32(dummy);
1094                 READ_BUF(dummy);
1095                 p += XDR_QUADLEN(dummy);
1096
1097                 /* nii_name */
1098                 READ_BUF(4);
1099                 READ32(dummy);
1100                 READ_BUF(dummy);
1101                 p += XDR_QUADLEN(dummy);
1102
1103                 /* nii_date */
1104                 READ_BUF(12);
1105                 p += 3;
1106         }
1107         DECODE_TAIL;
1108 }
1109
1110 static __be32
1111 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1112                             struct nfsd4_create_session *sess)
1113 {
1114         DECODE_HEAD;
1115
1116         u32 dummy;
1117         char *machine_name;
1118         int i;
1119         int nr_secflavs;
1120
1121         READ_BUF(16);
1122         COPYMEM(&sess->clientid, 8);
1123         READ32(sess->seqid);
1124         READ32(sess->flags);
1125
1126         /* Fore channel attrs */
1127         READ_BUF(28);
1128         READ32(dummy); /* headerpadsz is always 0 */
1129         READ32(sess->fore_channel.maxreq_sz);
1130         READ32(sess->fore_channel.maxresp_sz);
1131         READ32(sess->fore_channel.maxresp_cached);
1132         READ32(sess->fore_channel.maxops);
1133         READ32(sess->fore_channel.maxreqs);
1134         READ32(sess->fore_channel.nr_rdma_attrs);
1135         if (sess->fore_channel.nr_rdma_attrs == 1) {
1136                 READ_BUF(4);
1137                 READ32(sess->fore_channel.rdma_attrs);
1138         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1139                 dprintk("Too many fore channel attr bitmaps!\n");
1140                 goto xdr_error;
1141         }
1142
1143         /* Back channel attrs */
1144         READ_BUF(28);
1145         READ32(dummy); /* headerpadsz is always 0 */
1146         READ32(sess->back_channel.maxreq_sz);
1147         READ32(sess->back_channel.maxresp_sz);
1148         READ32(sess->back_channel.maxresp_cached);
1149         READ32(sess->back_channel.maxops);
1150         READ32(sess->back_channel.maxreqs);
1151         READ32(sess->back_channel.nr_rdma_attrs);
1152         if (sess->back_channel.nr_rdma_attrs == 1) {
1153                 READ_BUF(4);
1154                 READ32(sess->back_channel.rdma_attrs);
1155         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1156                 dprintk("Too many back channel attr bitmaps!\n");
1157                 goto xdr_error;
1158         }
1159
1160         READ_BUF(8);
1161         READ32(sess->callback_prog);
1162
1163         /* callback_sec_params4 */
1164         READ32(nr_secflavs);
1165         for (i = 0; i < nr_secflavs; ++i) {
1166                 READ_BUF(4);
1167                 READ32(dummy);
1168                 switch (dummy) {
1169                 case RPC_AUTH_NULL:
1170                         /* Nothing to read */
1171                         break;
1172                 case RPC_AUTH_UNIX:
1173                         READ_BUF(8);
1174                         /* stamp */
1175                         READ32(dummy);
1176
1177                         /* machine name */
1178                         READ32(dummy);
1179                         READ_BUF(dummy);
1180                         SAVEMEM(machine_name, dummy);
1181
1182                         /* uid, gid */
1183                         READ_BUF(8);
1184                         READ32(sess->uid);
1185                         READ32(sess->gid);
1186
1187                         /* more gids */
1188                         READ_BUF(4);
1189                         READ32(dummy);
1190                         READ_BUF(dummy * 4);
1191                         for (i = 0; i < dummy; ++i)
1192                                 READ32(dummy);
1193                         break;
1194                 case RPC_AUTH_GSS:
1195                         dprintk("RPC_AUTH_GSS callback secflavor "
1196                                 "not supported!\n");
1197                         READ_BUF(8);
1198                         /* gcbp_service */
1199                         READ32(dummy);
1200                         /* gcbp_handle_from_server */
1201                         READ32(dummy);
1202                         READ_BUF(dummy);
1203                         p += XDR_QUADLEN(dummy);
1204                         /* gcbp_handle_from_client */
1205                         READ_BUF(4);
1206                         READ32(dummy);
1207                         READ_BUF(dummy);
1208                         p += XDR_QUADLEN(dummy);
1209                         break;
1210                 default:
1211                         dprintk("Illegal callback secflavor\n");
1212                         return nfserr_inval;
1213                 }
1214         }
1215         DECODE_TAIL;
1216 }
1217
1218 static __be32
1219 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1220                              struct nfsd4_destroy_session *destroy_session)
1221 {
1222         DECODE_HEAD;
1223         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1224         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1225
1226         DECODE_TAIL;
1227 }
1228
1229 static __be32
1230 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1231                       struct nfsd4_sequence *seq)
1232 {
1233         DECODE_HEAD;
1234
1235         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1236         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1237         READ32(seq->seqid);
1238         READ32(seq->slotid);
1239         READ32(seq->maxslots);
1240         READ32(seq->cachethis);
1241
1242         DECODE_TAIL;
1243 }
1244
1245 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1246 {
1247         DECODE_HEAD;
1248
1249         READ_BUF(4);
1250         READ32(rc->rca_one_fs);
1251
1252         DECODE_TAIL;
1253 }
1254
1255 static __be32
1256 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1257 {
1258         return nfs_ok;
1259 }
1260
1261 static __be32
1262 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1263 {
1264         return nfserr_notsupp;
1265 }
1266
1267 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1268
1269 static nfsd4_dec nfsd4_dec_ops[] = {
1270         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1271         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1272         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1273         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1274         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1275         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1276         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1277         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1278         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1279         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1280         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1281         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1282         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1283         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1284         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1285         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1286         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1287         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1288         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1289         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1290         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1291         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1292         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1293         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1294         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1295         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1296         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1297         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1298         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1299         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1300         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1301         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1302         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1303         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1304         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1305         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1306         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1307 };
1308
1309 static nfsd4_dec nfsd41_dec_ops[] = {
1310         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1311         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1312         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1313         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1314         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1315         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1316         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1317         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1318         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1319         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1320         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1321         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1322         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1323         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1324         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1325         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1326         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1327         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1328         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1329         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1330         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1331         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1332         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1333         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1334         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1335         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1336         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1337         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1338         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1339         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1340         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1341         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1342         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1343         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1344         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1345         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1346         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1347
1348         /* new operations for NFSv4.1 */
1349         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1350         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_notsupp,
1351         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1352         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1353         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1354         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1355         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1356         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1357         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1358         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1359         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1360         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1361         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_notsupp,
1362         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1363         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1364         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1365         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1366         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_notsupp,
1367         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1368 };
1369
1370 struct nfsd4_minorversion_ops {
1371         nfsd4_dec *decoders;
1372         int nops;
1373 };
1374
1375 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1376         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1377         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1378 };
1379
1380 static __be32
1381 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1382 {
1383         DECODE_HEAD;
1384         struct nfsd4_op *op;
1385         struct nfsd4_minorversion_ops *ops;
1386         int i;
1387
1388         /*
1389          * XXX: According to spec, we should check the tag
1390          * for UTF-8 compliance.  I'm postponing this for
1391          * now because it seems that some clients do use
1392          * binary tags.
1393          */
1394         READ_BUF(4);
1395         READ32(argp->taglen);
1396         READ_BUF(argp->taglen + 8);
1397         SAVEMEM(argp->tag, argp->taglen);
1398         READ32(argp->minorversion);
1399         READ32(argp->opcnt);
1400
1401         if (argp->taglen > NFSD4_MAX_TAGLEN)
1402                 goto xdr_error;
1403         if (argp->opcnt > 100)
1404                 goto xdr_error;
1405
1406         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1407                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1408                 if (!argp->ops) {
1409                         argp->ops = argp->iops;
1410                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1411                         goto xdr_error;
1412                 }
1413         }
1414
1415         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1416                 argp->opcnt = 0;
1417
1418         ops = &nfsd4_minorversion[argp->minorversion];
1419         for (i = 0; i < argp->opcnt; i++) {
1420                 op = &argp->ops[i];
1421                 op->replay = NULL;
1422
1423                 /*
1424                  * We can't use READ_BUF() here because we need to handle
1425                  * a missing opcode as an OP_WRITE + 1. So we need to check
1426                  * to see if we're truly at the end of our buffer or if there
1427                  * is another page we need to flip to.
1428                  */
1429
1430                 if (argp->p == argp->end) {
1431                         if (argp->pagelen < 4) {
1432                                 /* There isn't an opcode still on the wire */
1433                                 op->opnum = OP_WRITE + 1;
1434                                 op->status = nfserr_bad_xdr;
1435                                 argp->opcnt = i+1;
1436                                 break;
1437                         }
1438
1439                         /*
1440                          * False alarm. We just hit a page boundary, but there
1441                          * is still data available.  Move pointer across page
1442                          * boundary.  *snip from READ_BUF*
1443                          */
1444                         argp->p = page_address(argp->pagelist[0]);
1445                         argp->pagelist++;
1446                         if (argp->pagelen < PAGE_SIZE) {
1447                                 argp->end = argp->p + (argp->pagelen>>2);
1448                                 argp->pagelen = 0;
1449                         } else {
1450                                 argp->end = argp->p + (PAGE_SIZE>>2);
1451                                 argp->pagelen -= PAGE_SIZE;
1452                         }
1453                 }
1454                 op->opnum = ntohl(*argp->p++);
1455
1456                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1457                         op->status = ops->decoders[op->opnum](argp, &op->u);
1458                 else {
1459                         op->opnum = OP_ILLEGAL;
1460                         op->status = nfserr_op_illegal;
1461                 }
1462
1463                 if (op->status) {
1464                         argp->opcnt = i+1;
1465                         break;
1466                 }
1467         }
1468
1469         DECODE_TAIL;
1470 }
1471
1472 #define WRITE32(n)               *p++ = htonl(n)
1473 #define WRITE64(n)               do {                           \
1474         *p++ = htonl((u32)((n) >> 32));                         \
1475         *p++ = htonl((u32)(n));                                 \
1476 } while (0)
1477 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1478         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1479         memcpy(p, ptr, nbytes);                                 \
1480         p += XDR_QUADLEN(nbytes);                               \
1481 }} while (0)
1482
1483 static void write32(__be32 **p, u32 n)
1484 {
1485         *(*p)++ = n;
1486 }
1487
1488 static void write64(__be32 **p, u64 n)
1489 {
1490         write32(p, (u32)(n >> 32));
1491         write32(p, (u32)n);
1492 }
1493
1494 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1495 {
1496         if (IS_I_VERSION(inode)) {
1497                 write64(p, inode->i_version);
1498         } else {
1499                 write32(p, stat->ctime.tv_sec);
1500                 write32(p, stat->ctime.tv_nsec);
1501         }
1502 }
1503
1504 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1505 {
1506         write32(p, c->atomic);
1507         if (c->change_supported) {
1508                 write64(p, c->before_change);
1509                 write64(p, c->after_change);
1510         } else {
1511                 write32(p, c->before_ctime_sec);
1512                 write32(p, c->before_ctime_nsec);
1513                 write32(p, c->after_ctime_sec);
1514                 write32(p, c->after_ctime_nsec);
1515         }
1516 }
1517
1518 #define RESERVE_SPACE(nbytes)   do {                            \
1519         p = resp->p;                                            \
1520         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1521 } while (0)
1522 #define ADJUST_ARGS()           resp->p = p
1523
1524 /*
1525  * Header routine to setup seqid operation replay cache
1526  */
1527 #define ENCODE_SEQID_OP_HEAD                                    \
1528         __be32 *save;                                           \
1529                                                                 \
1530         save = resp->p;
1531
1532 /*
1533  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1534  * is where sequence id's are incremented, and the replay cache is filled.
1535  * Note that we increment sequence id's here, at the last moment, so we're sure
1536  * we know whether the error to be returned is a sequence id mutating error.
1537  */
1538
1539 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1540         if (seqid_mutating_err(nfserr) && stateowner) {         \
1541                 stateowner->so_seqid++;                         \
1542                 stateowner->so_replay.rp_status = nfserr;       \
1543                 stateowner->so_replay.rp_buflen =               \
1544                           (((char *)(resp)->p - (char *)save)); \
1545                 memcpy(stateowner->so_replay.rp_buf, save,      \
1546                         stateowner->so_replay.rp_buflen);       \
1547         } } while (0);
1548
1549 /* Encode as an array of strings the string given with components
1550  * separated @sep.
1551  */
1552 static __be32 nfsd4_encode_components(char sep, char *components,
1553                                    __be32 **pp, int *buflen)
1554 {
1555         __be32 *p = *pp;
1556         __be32 *countp = p;
1557         int strlen, count=0;
1558         char *str, *end;
1559
1560         dprintk("nfsd4_encode_components(%s)\n", components);
1561         if ((*buflen -= 4) < 0)
1562                 return nfserr_resource;
1563         WRITE32(0); /* We will fill this in with @count later */
1564         end = str = components;
1565         while (*end) {
1566                 for (; *end && (*end != sep); end++)
1567                         ; /* Point to end of component */
1568                 strlen = end - str;
1569                 if (strlen) {
1570                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1571                                 return nfserr_resource;
1572                         WRITE32(strlen);
1573                         WRITEMEM(str, strlen);
1574                         count++;
1575                 }
1576                 else
1577                         end++;
1578                 str = end;
1579         }
1580         *pp = p;
1581         p = countp;
1582         WRITE32(count);
1583         return 0;
1584 }
1585
1586 /*
1587  * encode a location element of a fs_locations structure
1588  */
1589 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1590                                     __be32 **pp, int *buflen)
1591 {
1592         __be32 status;
1593         __be32 *p = *pp;
1594
1595         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1596         if (status)
1597                 return status;
1598         status = nfsd4_encode_components('/', location->path, &p, buflen);
1599         if (status)
1600                 return status;
1601         *pp = p;
1602         return 0;
1603 }
1604
1605 /*
1606  * Return the path to an export point in the pseudo filesystem namespace
1607  * Returned string is safe to use as long as the caller holds a reference
1608  * to @exp.
1609  */
1610 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1611 {
1612         struct svc_fh tmp_fh;
1613         char *path = NULL, *rootpath;
1614         size_t rootlen;
1615
1616         fh_init(&tmp_fh, NFS4_FHSIZE);
1617         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1618         if (*stat)
1619                 return NULL;
1620         rootpath = tmp_fh.fh_export->ex_pathname;
1621
1622         path = exp->ex_pathname;
1623
1624         rootlen = strlen(rootpath);
1625         if (strncmp(path, rootpath, rootlen)) {
1626                 dprintk("nfsd: fs_locations failed;"
1627                         "%s is not contained in %s\n", path, rootpath);
1628                 *stat = nfserr_notsupp;
1629                 path = NULL;
1630                 goto out;
1631         }
1632         path += rootlen;
1633 out:
1634         fh_put(&tmp_fh);
1635         return path;
1636 }
1637
1638 /*
1639  *  encode a fs_locations structure
1640  */
1641 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1642                                      struct svc_export *exp,
1643                                      __be32 **pp, int *buflen)
1644 {
1645         __be32 status;
1646         int i;
1647         __be32 *p = *pp;
1648         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1649         char *root = nfsd4_path(rqstp, exp, &status);
1650
1651         if (status)
1652                 return status;
1653         status = nfsd4_encode_components('/', root, &p, buflen);
1654         if (status)
1655                 return status;
1656         if ((*buflen -= 4) < 0)
1657                 return nfserr_resource;
1658         WRITE32(fslocs->locations_count);
1659         for (i=0; i<fslocs->locations_count; i++) {
1660                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1661                                                    &p, buflen);
1662                 if (status)
1663                         return status;
1664         }
1665         *pp = p;
1666         return 0;
1667 }
1668
1669 static u32 nfs4_ftypes[16] = {
1670         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1671         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1672         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1673         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1674 };
1675
1676 static __be32
1677 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1678                         __be32 **p, int *buflen)
1679 {
1680         int status;
1681
1682         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1683                 return nfserr_resource;
1684         if (whotype != NFS4_ACL_WHO_NAMED)
1685                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1686         else if (group)
1687                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1688         else
1689                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1690         if (status < 0)
1691                 return nfserrno(status);
1692         *p = xdr_encode_opaque(*p, NULL, status);
1693         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1694         BUG_ON(*buflen < 0);
1695         return 0;
1696 }
1697
1698 static inline __be32
1699 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1700 {
1701         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1702 }
1703
1704 static inline __be32
1705 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1706 {
1707         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1708 }
1709
1710 static inline __be32
1711 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1712                 __be32 **p, int *buflen)
1713 {
1714         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1715 }
1716
1717 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1718                               FATTR4_WORD0_RDATTR_ERROR)
1719 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1720
1721 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1722 {
1723         /* As per referral draft:  */
1724         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1725             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1726                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1727                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1728                         *rdattr_err = NFSERR_MOVED;
1729                 else
1730                         return nfserr_moved;
1731         }
1732         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1733         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1734         return 0;
1735 }
1736
1737 /*
1738  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1739  * ourselves.
1740  *
1741  * @countp is the buffer size in _words_; upon successful return this becomes
1742  * replaced with the number of words written.
1743  */
1744 __be32
1745 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1746                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1747                 struct svc_rqst *rqstp, int ignore_crossmnt)
1748 {
1749         u32 bmval0 = bmval[0];
1750         u32 bmval1 = bmval[1];
1751         u32 bmval2 = bmval[2];
1752         struct kstat stat;
1753         struct svc_fh tempfh;
1754         struct kstatfs statfs;
1755         int buflen = *countp << 2;
1756         __be32 *attrlenp;
1757         u32 dummy;
1758         u64 dummy64;
1759         u32 rdattr_err = 0;
1760         __be32 *p = buffer;
1761         __be32 status;
1762         int err;
1763         int aclsupport = 0;
1764         struct nfs4_acl *acl = NULL;
1765         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1766         u32 minorversion = resp->cstate.minorversion;
1767         struct path path = {
1768                 .mnt    = exp->ex_path.mnt,
1769                 .dentry = dentry,
1770         };
1771
1772         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1773         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1774         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1775         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1776
1777         if (exp->ex_fslocs.migrated) {
1778                 BUG_ON(bmval[2]);
1779                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1780                 if (status)
1781                         goto out;
1782         }
1783
1784         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1785         if (err)
1786                 goto out_nfserr;
1787         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1788                         FATTR4_WORD0_MAXNAME)) ||
1789             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1790                        FATTR4_WORD1_SPACE_TOTAL))) {
1791                 err = vfs_statfs(&path, &statfs);
1792                 if (err)
1793                         goto out_nfserr;
1794         }
1795         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1796                 fh_init(&tempfh, NFS4_FHSIZE);
1797                 status = fh_compose(&tempfh, exp, dentry, NULL);
1798                 if (status)
1799                         goto out;
1800                 fhp = &tempfh;
1801         }
1802         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1803                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1804                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1805                 aclsupport = (err == 0);
1806                 if (bmval0 & FATTR4_WORD0_ACL) {
1807                         if (err == -EOPNOTSUPP)
1808                                 bmval0 &= ~FATTR4_WORD0_ACL;
1809                         else if (err == -EINVAL) {
1810                                 status = nfserr_attrnotsupp;
1811                                 goto out;
1812                         } else if (err != 0)
1813                                 goto out_nfserr;
1814                 }
1815         }
1816
1817         if (bmval2) {
1818                 if ((buflen -= 16) < 0)
1819                         goto out_resource;
1820                 WRITE32(3);
1821                 WRITE32(bmval0);
1822                 WRITE32(bmval1);
1823                 WRITE32(bmval2);
1824         } else if (bmval1) {
1825                 if ((buflen -= 12) < 0)
1826                         goto out_resource;
1827                 WRITE32(2);
1828                 WRITE32(bmval0);
1829                 WRITE32(bmval1);
1830         } else {
1831                 if ((buflen -= 8) < 0)
1832                         goto out_resource;
1833                 WRITE32(1);
1834                 WRITE32(bmval0);
1835         }
1836         attrlenp = p++;                /* to be backfilled later */
1837
1838         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1839                 u32 word0 = nfsd_suppattrs0(minorversion);
1840                 u32 word1 = nfsd_suppattrs1(minorversion);
1841                 u32 word2 = nfsd_suppattrs2(minorversion);
1842
1843                 if (!aclsupport)
1844                         word0 &= ~FATTR4_WORD0_ACL;
1845                 if (!word2) {
1846                         if ((buflen -= 12) < 0)
1847                                 goto out_resource;
1848                         WRITE32(2);
1849                         WRITE32(word0);
1850                         WRITE32(word1);
1851                 } else {
1852                         if ((buflen -= 16) < 0)
1853                                 goto out_resource;
1854                         WRITE32(3);
1855                         WRITE32(word0);
1856                         WRITE32(word1);
1857                         WRITE32(word2);
1858                 }
1859         }
1860         if (bmval0 & FATTR4_WORD0_TYPE) {
1861                 if ((buflen -= 4) < 0)
1862                         goto out_resource;
1863                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1864                 if (dummy == NF4BAD)
1865                         goto out_serverfault;
1866                 WRITE32(dummy);
1867         }
1868         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1869                 if ((buflen -= 4) < 0)
1870                         goto out_resource;
1871                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1872                         WRITE32(NFS4_FH_PERSISTENT);
1873                 else
1874                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1875         }
1876         if (bmval0 & FATTR4_WORD0_CHANGE) {
1877                 if ((buflen -= 8) < 0)
1878                         goto out_resource;
1879                 write_change(&p, &stat, dentry->d_inode);
1880         }
1881         if (bmval0 & FATTR4_WORD0_SIZE) {
1882                 if ((buflen -= 8) < 0)
1883                         goto out_resource;
1884                 WRITE64(stat.size);
1885         }
1886         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1887                 if ((buflen -= 4) < 0)
1888                         goto out_resource;
1889                 WRITE32(1);
1890         }
1891         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1892                 if ((buflen -= 4) < 0)
1893                         goto out_resource;
1894                 WRITE32(1);
1895         }
1896         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1897                 if ((buflen -= 4) < 0)
1898                         goto out_resource;
1899                 WRITE32(0);
1900         }
1901         if (bmval0 & FATTR4_WORD0_FSID) {
1902                 if ((buflen -= 16) < 0)
1903                         goto out_resource;
1904                 if (exp->ex_fslocs.migrated) {
1905                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1906                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1907                 } else switch(fsid_source(fhp)) {
1908                 case FSIDSOURCE_FSID:
1909                         WRITE64((u64)exp->ex_fsid);
1910                         WRITE64((u64)0);
1911                         break;
1912                 case FSIDSOURCE_DEV:
1913                         WRITE32(0);
1914                         WRITE32(MAJOR(stat.dev));
1915                         WRITE32(0);
1916                         WRITE32(MINOR(stat.dev));
1917                         break;
1918                 case FSIDSOURCE_UUID:
1919                         WRITEMEM(exp->ex_uuid, 16);
1920                         break;
1921                 }
1922         }
1923         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1924                 if ((buflen -= 4) < 0)
1925                         goto out_resource;
1926                 WRITE32(0);
1927         }
1928         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1929                 if ((buflen -= 4) < 0)
1930                         goto out_resource;
1931                 WRITE32(nfsd4_lease);
1932         }
1933         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1934                 if ((buflen -= 4) < 0)
1935                         goto out_resource;
1936                 WRITE32(rdattr_err);
1937         }
1938         if (bmval0 & FATTR4_WORD0_ACL) {
1939                 struct nfs4_ace *ace;
1940
1941                 if (acl == NULL) {
1942                         if ((buflen -= 4) < 0)
1943                                 goto out_resource;
1944
1945                         WRITE32(0);
1946                         goto out_acl;
1947                 }
1948                 if ((buflen -= 4) < 0)
1949                         goto out_resource;
1950                 WRITE32(acl->naces);
1951
1952                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1953                         if ((buflen -= 4*3) < 0)
1954                                 goto out_resource;
1955                         WRITE32(ace->type);
1956                         WRITE32(ace->flag);
1957                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1958                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1959                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1960                                 &p, &buflen);
1961                         if (status == nfserr_resource)
1962                                 goto out_resource;
1963                         if (status)
1964                                 goto out;
1965                 }
1966         }
1967 out_acl:
1968         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1969                 if ((buflen -= 4) < 0)
1970                         goto out_resource;
1971                 WRITE32(aclsupport ?
1972                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1973         }
1974         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1975                 if ((buflen -= 4) < 0)
1976                         goto out_resource;
1977                 WRITE32(1);
1978         }
1979         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1980                 if ((buflen -= 4) < 0)
1981                         goto out_resource;
1982                 WRITE32(1);
1983         }
1984         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1985                 if ((buflen -= 4) < 0)
1986                         goto out_resource;
1987                 WRITE32(1);
1988         }
1989         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1990                 if ((buflen -= 4) < 0)
1991                         goto out_resource;
1992                 WRITE32(1);
1993         }
1994         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1995                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1996                 if (buflen < 0)
1997                         goto out_resource;
1998                 WRITE32(fhp->fh_handle.fh_size);
1999                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2000         }
2001         if (bmval0 & FATTR4_WORD0_FILEID) {
2002                 if ((buflen -= 8) < 0)
2003                         goto out_resource;
2004                 WRITE64(stat.ino);
2005         }
2006         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2007                 if ((buflen -= 8) < 0)
2008                         goto out_resource;
2009                 WRITE64((u64) statfs.f_ffree);
2010         }
2011         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2012                 if ((buflen -= 8) < 0)
2013                         goto out_resource;
2014                 WRITE64((u64) statfs.f_ffree);
2015         }
2016         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2017                 if ((buflen -= 8) < 0)
2018                         goto out_resource;
2019                 WRITE64((u64) statfs.f_files);
2020         }
2021         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2022                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2023                 if (status == nfserr_resource)
2024                         goto out_resource;
2025                 if (status)
2026                         goto out;
2027         }
2028         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2029                 if ((buflen -= 4) < 0)
2030                         goto out_resource;
2031                 WRITE32(1);
2032         }
2033         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2034                 if ((buflen -= 8) < 0)
2035                         goto out_resource;
2036                 WRITE64(~(u64)0);
2037         }
2038         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2039                 if ((buflen -= 4) < 0)
2040                         goto out_resource;
2041                 WRITE32(255);
2042         }
2043         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2044                 if ((buflen -= 4) < 0)
2045                         goto out_resource;
2046                 WRITE32(statfs.f_namelen);
2047         }
2048         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2049                 if ((buflen -= 8) < 0)
2050                         goto out_resource;
2051                 WRITE64((u64) svc_max_payload(rqstp));
2052         }
2053         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2054                 if ((buflen -= 8) < 0)
2055                         goto out_resource;
2056                 WRITE64((u64) svc_max_payload(rqstp));
2057         }
2058         if (bmval1 & FATTR4_WORD1_MODE) {
2059                 if ((buflen -= 4) < 0)
2060                         goto out_resource;
2061                 WRITE32(stat.mode & S_IALLUGO);
2062         }
2063         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2064                 if ((buflen -= 4) < 0)
2065                         goto out_resource;
2066                 WRITE32(1);
2067         }
2068         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2069                 if ((buflen -= 4) < 0)
2070                         goto out_resource;
2071                 WRITE32(stat.nlink);
2072         }
2073         if (bmval1 & FATTR4_WORD1_OWNER) {
2074                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2075                 if (status == nfserr_resource)
2076                         goto out_resource;
2077                 if (status)
2078                         goto out;
2079         }
2080         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2081                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2082                 if (status == nfserr_resource)
2083                         goto out_resource;
2084                 if (status)
2085                         goto out;
2086         }
2087         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2088                 if ((buflen -= 8) < 0)
2089                         goto out_resource;
2090                 WRITE32((u32) MAJOR(stat.rdev));
2091                 WRITE32((u32) MINOR(stat.rdev));
2092         }
2093         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2094                 if ((buflen -= 8) < 0)
2095                         goto out_resource;
2096                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2097                 WRITE64(dummy64);
2098         }
2099         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2100                 if ((buflen -= 8) < 0)
2101                         goto out_resource;
2102                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2103                 WRITE64(dummy64);
2104         }
2105         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2106                 if ((buflen -= 8) < 0)
2107                         goto out_resource;
2108                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2109                 WRITE64(dummy64);
2110         }
2111         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2112                 if ((buflen -= 8) < 0)
2113                         goto out_resource;
2114                 dummy64 = (u64)stat.blocks << 9;
2115                 WRITE64(dummy64);
2116         }
2117         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2118                 if ((buflen -= 12) < 0)
2119                         goto out_resource;
2120                 WRITE32(0);
2121                 WRITE32(stat.atime.tv_sec);
2122                 WRITE32(stat.atime.tv_nsec);
2123         }
2124         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2125                 if ((buflen -= 12) < 0)
2126                         goto out_resource;
2127                 WRITE32(0);
2128                 WRITE32(1);
2129                 WRITE32(0);
2130         }
2131         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2132                 if ((buflen -= 12) < 0)
2133                         goto out_resource;
2134                 WRITE32(0);
2135                 WRITE32(stat.ctime.tv_sec);
2136                 WRITE32(stat.ctime.tv_nsec);
2137         }
2138         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2139                 if ((buflen -= 12) < 0)
2140                         goto out_resource;
2141                 WRITE32(0);
2142                 WRITE32(stat.mtime.tv_sec);
2143                 WRITE32(stat.mtime.tv_nsec);
2144         }
2145         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2146                 if ((buflen -= 8) < 0)
2147                         goto out_resource;
2148                 /*
2149                  * Get parent's attributes if not ignoring crossmount
2150                  * and this is the root of a cross-mounted filesystem.
2151                  */
2152                 if (ignore_crossmnt == 0 &&
2153                     dentry == exp->ex_path.mnt->mnt_root) {
2154                         struct path path = exp->ex_path;
2155                         path_get(&path);
2156                         while (follow_up(&path)) {
2157                                 if (path.dentry != path.mnt->mnt_root)
2158                                         break;
2159                         }
2160                         err = vfs_getattr(path.mnt, path.dentry, &stat);
2161                         path_put(&path);
2162                         if (err)
2163                                 goto out_nfserr;
2164                 }
2165                 WRITE64(stat.ino);
2166         }
2167         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2168                 WRITE32(3);
2169                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2170                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2171                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2172         }
2173
2174         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2175         *countp = p - buffer;
2176         status = nfs_ok;
2177
2178 out:
2179         kfree(acl);
2180         if (fhp == &tempfh)
2181                 fh_put(&tempfh);
2182         return status;
2183 out_nfserr:
2184         status = nfserrno(err);
2185         goto out;
2186 out_resource:
2187         *countp = 0;
2188         status = nfserr_resource;
2189         goto out;
2190 out_serverfault:
2191         status = nfserr_serverfault;
2192         goto out;
2193 }
2194
2195 static inline int attributes_need_mount(u32 *bmval)
2196 {
2197         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2198                 return 1;
2199         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2200                 return 1;
2201         return 0;
2202 }
2203
2204 static __be32
2205 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2206                 const char *name, int namlen, __be32 *p, int *buflen)
2207 {
2208         struct svc_export *exp = cd->rd_fhp->fh_export;
2209         struct dentry *dentry;
2210         __be32 nfserr;
2211         int ignore_crossmnt = 0;
2212
2213         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2214         if (IS_ERR(dentry))
2215                 return nfserrno(PTR_ERR(dentry));
2216         if (!dentry->d_inode) {
2217                 /*
2218                  * nfsd_buffered_readdir drops the i_mutex between
2219                  * readdir and calling this callback, leaving a window
2220                  * where this directory entry could have gone away.
2221                  */
2222                 dput(dentry);
2223                 return nfserr_noent;
2224         }
2225
2226         exp_get(exp);
2227         /*
2228          * In the case of a mountpoint, the client may be asking for
2229          * attributes that are only properties of the underlying filesystem
2230          * as opposed to the cross-mounted file system. In such a case,
2231          * we will not follow the cross mount and will fill the attribtutes
2232          * directly from the mountpoint dentry.
2233          */
2234         if (nfsd_mountpoint(dentry, exp)) {
2235                 int err;
2236
2237                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2238                                 && !attributes_need_mount(cd->rd_bmval)) {
2239                         ignore_crossmnt = 1;
2240                         goto out_encode;
2241                 }
2242                 /*
2243                  * Why the heck aren't we just using nfsd_lookup??
2244                  * Different "."/".." handling?  Something else?
2245                  * At least, add a comment here to explain....
2246                  */
2247                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2248                 if (err) {
2249                         nfserr = nfserrno(err);
2250                         goto out_put;
2251                 }
2252                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2253                 if (nfserr)
2254                         goto out_put;
2255
2256         }
2257 out_encode:
2258         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2259                                         cd->rd_rqstp, ignore_crossmnt);
2260 out_put:
2261         dput(dentry);
2262         exp_put(exp);
2263         return nfserr;
2264 }
2265
2266 static __be32 *
2267 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2268 {
2269         __be32 *attrlenp;
2270
2271         if (buflen < 6)
2272                 return NULL;
2273         *p++ = htonl(2);
2274         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2275         *p++ = htonl(0);                         /* bmval1 */
2276
2277         attrlenp = p++;
2278         *p++ = nfserr;       /* no htonl */
2279         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2280         return p;
2281 }
2282
2283 static int
2284 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2285                     loff_t offset, u64 ino, unsigned int d_type)
2286 {
2287         struct readdir_cd *ccd = ccdv;
2288         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2289         int buflen;
2290         __be32 *p = cd->buffer;
2291         __be32 *cookiep;
2292         __be32 nfserr = nfserr_toosmall;
2293
2294         /* In nfsv4, "." and ".." never make it onto the wire.. */
2295         if (name && isdotent(name, namlen)) {
2296                 cd->common.err = nfs_ok;
2297                 return 0;
2298         }
2299
2300         if (cd->offset)
2301                 xdr_encode_hyper(cd->offset, (u64) offset);
2302
2303         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2304         if (buflen < 0)
2305                 goto fail;
2306
2307         *p++ = xdr_one;                             /* mark entry present */
2308         cookiep = p;
2309         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2310         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2311
2312         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2313         switch (nfserr) {
2314         case nfs_ok:
2315                 p += buflen;
2316                 break;
2317         case nfserr_resource:
2318                 nfserr = nfserr_toosmall;
2319                 goto fail;
2320         case nfserr_dropit:
2321                 goto fail;
2322         case nfserr_noent:
2323                 goto skip_entry;
2324         default:
2325                 /*
2326                  * If the client requested the RDATTR_ERROR attribute,
2327                  * we stuff the error code into this attribute
2328                  * and continue.  If this attribute was not requested,
2329                  * then in accordance with the spec, we fail the
2330                  * entire READDIR operation(!)
2331                  */
2332                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2333                         goto fail;
2334                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2335                 if (p == NULL) {
2336                         nfserr = nfserr_toosmall;
2337                         goto fail;
2338                 }
2339         }
2340         cd->buflen -= (p - cd->buffer);
2341         cd->buffer = p;
2342         cd->offset = cookiep;
2343 skip_entry:
2344         cd->common.err = nfs_ok;
2345         return 0;
2346 fail:
2347         cd->common.err = nfserr;
2348         return -EINVAL;
2349 }
2350
2351 static void
2352 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2353 {
2354         __be32 *p;
2355
2356         RESERVE_SPACE(sizeof(stateid_t));
2357         WRITE32(sid->si_generation);
2358         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2359         ADJUST_ARGS();
2360 }
2361
2362 static __be32
2363 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2364 {
2365         __be32 *p;
2366
2367         if (!nfserr) {
2368                 RESERVE_SPACE(8);
2369                 WRITE32(access->ac_supported);
2370                 WRITE32(access->ac_resp_access);
2371                 ADJUST_ARGS();
2372         }
2373         return nfserr;
2374 }
2375
2376 static __be32
2377 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2378 {
2379         ENCODE_SEQID_OP_HEAD;
2380
2381         if (!nfserr)
2382                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2383
2384         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2385         return nfserr;
2386 }
2387
2388
2389 static __be32
2390 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2391 {
2392         __be32 *p;
2393
2394         if (!nfserr) {
2395                 RESERVE_SPACE(8);
2396                 WRITEMEM(commit->co_verf.data, 8);
2397                 ADJUST_ARGS();
2398         }
2399         return nfserr;
2400 }
2401
2402 static __be32
2403 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2404 {
2405         __be32 *p;
2406
2407         if (!nfserr) {
2408                 RESERVE_SPACE(32);
2409                 write_cinfo(&p, &create->cr_cinfo);
2410                 WRITE32(2);
2411                 WRITE32(create->cr_bmval[0]);
2412                 WRITE32(create->cr_bmval[1]);
2413                 ADJUST_ARGS();
2414         }
2415         return nfserr;
2416 }
2417
2418 static __be32
2419 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2420 {
2421         struct svc_fh *fhp = getattr->ga_fhp;
2422         int buflen;
2423
2424         if (nfserr)
2425                 return nfserr;
2426
2427         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2428         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2429                                     resp->p, &buflen, getattr->ga_bmval,
2430                                     resp->rqstp, 0);
2431         if (!nfserr)
2432                 resp->p += buflen;
2433         return nfserr;
2434 }
2435
2436 static __be32
2437 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2438 {
2439         struct svc_fh *fhp = *fhpp;
2440         unsigned int len;
2441         __be32 *p;
2442
2443         if (!nfserr) {
2444                 len = fhp->fh_handle.fh_size;
2445                 RESERVE_SPACE(len + 4);
2446                 WRITE32(len);
2447                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2448                 ADJUST_ARGS();
2449         }
2450         return nfserr;
2451 }
2452
2453 /*
2454 * Including all fields other than the name, a LOCK4denied structure requires
2455 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2456 */
2457 static void
2458 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2459 {
2460         __be32 *p;
2461
2462         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2463         WRITE64(ld->ld_start);
2464         WRITE64(ld->ld_length);
2465         WRITE32(ld->ld_type);
2466         if (ld->ld_sop) {
2467                 WRITEMEM(&ld->ld_clientid, 8);
2468                 WRITE32(ld->ld_sop->so_owner.len);
2469                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2470                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2471         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2472                 WRITE64((u64)0); /* clientid */
2473                 WRITE32(0); /* length of owner name */
2474         }
2475         ADJUST_ARGS();
2476 }
2477
2478 static __be32
2479 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2480 {
2481         ENCODE_SEQID_OP_HEAD;
2482
2483         if (!nfserr)
2484                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2485         else if (nfserr == nfserr_denied)
2486                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2487
2488         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2489         return nfserr;
2490 }
2491
2492 static __be32
2493 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2494 {
2495         if (nfserr == nfserr_denied)
2496                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2497         return nfserr;
2498 }
2499
2500 static __be32
2501 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2502 {
2503         ENCODE_SEQID_OP_HEAD;
2504
2505         if (!nfserr)
2506                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2507
2508         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2509         return nfserr;
2510 }
2511
2512
2513 static __be32
2514 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2515 {
2516         __be32 *p;
2517
2518         if (!nfserr) {
2519                 RESERVE_SPACE(20);
2520                 write_cinfo(&p, &link->li_cinfo);
2521                 ADJUST_ARGS();
2522         }
2523         return nfserr;
2524 }
2525
2526
2527 static __be32
2528 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2529 {
2530         __be32 *p;
2531         ENCODE_SEQID_OP_HEAD;
2532
2533         if (nfserr)
2534                 goto out;
2535
2536         nfsd4_encode_stateid(resp, &open->op_stateid);
2537         RESERVE_SPACE(40);
2538         write_cinfo(&p, &open->op_cinfo);
2539         WRITE32(open->op_rflags);
2540         WRITE32(2);
2541         WRITE32(open->op_bmval[0]);
2542         WRITE32(open->op_bmval[1]);
2543         WRITE32(open->op_delegate_type);
2544         ADJUST_ARGS();
2545
2546         switch (open->op_delegate_type) {
2547         case NFS4_OPEN_DELEGATE_NONE:
2548                 break;
2549         case NFS4_OPEN_DELEGATE_READ:
2550                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2551                 RESERVE_SPACE(20);
2552                 WRITE32(open->op_recall);
2553
2554                 /*
2555                  * TODO: ACE's in delegations
2556                  */
2557                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2558                 WRITE32(0);
2559                 WRITE32(0);
2560                 WRITE32(0);   /* XXX: is NULL principal ok? */
2561                 ADJUST_ARGS();
2562                 break;
2563         case NFS4_OPEN_DELEGATE_WRITE:
2564                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2565                 RESERVE_SPACE(32);
2566                 WRITE32(0);
2567
2568                 /*
2569                  * TODO: space_limit's in delegations
2570                  */
2571                 WRITE32(NFS4_LIMIT_SIZE);
2572                 WRITE32(~(u32)0);
2573                 WRITE32(~(u32)0);
2574
2575                 /*
2576                  * TODO: ACE's in delegations
2577                  */
2578                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2579                 WRITE32(0);
2580                 WRITE32(0);
2581                 WRITE32(0);   /* XXX: is NULL principal ok? */
2582                 ADJUST_ARGS();
2583                 break;
2584         default:
2585                 BUG();
2586         }
2587         /* XXX save filehandle here */
2588 out:
2589         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2590         return nfserr;
2591 }
2592
2593 static __be32
2594 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2595 {
2596         ENCODE_SEQID_OP_HEAD;
2597
2598         if (!nfserr)
2599                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2600
2601         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2602         return nfserr;
2603 }
2604
2605 static __be32
2606 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2607 {
2608         ENCODE_SEQID_OP_HEAD;
2609
2610         if (!nfserr)
2611                 nfsd4_encode_stateid(resp, &od->od_stateid);
2612
2613         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2614         return nfserr;
2615 }
2616
2617 static __be32
2618 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2619                   struct nfsd4_read *read)
2620 {
2621         u32 eof;
2622         int v, pn;
2623         unsigned long maxcount;
2624         long len;
2625         __be32 *p;
2626
2627         if (nfserr)
2628                 return nfserr;
2629         if (resp->xbuf->page_len)
2630                 return nfserr_resource;
2631
2632         RESERVE_SPACE(8); /* eof flag and byte count */
2633
2634         maxcount = svc_max_payload(resp->rqstp);
2635         if (maxcount > read->rd_length)
2636                 maxcount = read->rd_length;
2637
2638         len = maxcount;
2639         v = 0;
2640         while (len > 0) {
2641                 pn = resp->rqstp->rq_resused++;
2642                 resp->rqstp->rq_vec[v].iov_base =
2643                         page_address(resp->rqstp->rq_respages[pn]);
2644                 resp->rqstp->rq_vec[v].iov_len =
2645                         len < PAGE_SIZE ? len : PAGE_SIZE;
2646                 v++;
2647                 len -= PAGE_SIZE;
2648         }
2649         read->rd_vlen = v;
2650
2651         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2652                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2653                         &maxcount);
2654
2655         if (nfserr == nfserr_symlink)
2656                 nfserr = nfserr_inval;
2657         if (nfserr)
2658                 return nfserr;
2659         eof = (read->rd_offset + maxcount >=
2660                read->rd_fhp->fh_dentry->d_inode->i_size);
2661
2662         WRITE32(eof);
2663         WRITE32(maxcount);
2664         ADJUST_ARGS();
2665         resp->xbuf->head[0].iov_len = (char*)p
2666                                         - (char*)resp->xbuf->head[0].iov_base;
2667         resp->xbuf->page_len = maxcount;
2668
2669         /* Use rest of head for padding and remaining ops: */
2670         resp->xbuf->tail[0].iov_base = p;
2671         resp->xbuf->tail[0].iov_len = 0;
2672         if (maxcount&3) {
2673                 RESERVE_SPACE(4);
2674                 WRITE32(0);
2675                 resp->xbuf->tail[0].iov_base += maxcount&3;
2676                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2677                 ADJUST_ARGS();
2678         }
2679         return 0;
2680 }
2681
2682 static __be32
2683 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2684 {
2685         int maxcount;
2686         char *page;
2687         __be32 *p;
2688
2689         if (nfserr)
2690                 return nfserr;
2691         if (resp->xbuf->page_len)
2692                 return nfserr_resource;
2693
2694         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2695
2696         maxcount = PAGE_SIZE;
2697         RESERVE_SPACE(4);
2698
2699         /*
2700          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2701          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2702          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2703          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2704          */
2705         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2706         if (nfserr == nfserr_isdir)
2707                 return nfserr_inval;
2708         if (nfserr)
2709                 return nfserr;
2710
2711         WRITE32(maxcount);
2712         ADJUST_ARGS();
2713         resp->xbuf->head[0].iov_len = (char*)p
2714                                 - (char*)resp->xbuf->head[0].iov_base;
2715         resp->xbuf->page_len = maxcount;
2716
2717         /* Use rest of head for padding and remaining ops: */
2718         resp->xbuf->tail[0].iov_base = p;
2719         resp->xbuf->tail[0].iov_len = 0;
2720         if (maxcount&3) {
2721                 RESERVE_SPACE(4);
2722                 WRITE32(0);
2723                 resp->xbuf->tail[0].iov_base += maxcount&3;
2724                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2725                 ADJUST_ARGS();
2726         }
2727         return 0;
2728 }
2729
2730 static __be32
2731 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2732 {
2733         int maxcount;
2734         loff_t offset;
2735         __be32 *page, *savep, *tailbase;
2736         __be32 *p;
2737
2738         if (nfserr)
2739                 return nfserr;
2740         if (resp->xbuf->page_len)
2741                 return nfserr_resource;
2742
2743         RESERVE_SPACE(8);  /* verifier */
2744         savep = p;
2745
2746         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2747         WRITE32(0);
2748         WRITE32(0);
2749         ADJUST_ARGS();
2750         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2751         tailbase = p;
2752
2753         maxcount = PAGE_SIZE;
2754         if (maxcount > readdir->rd_maxcount)
2755                 maxcount = readdir->rd_maxcount;
2756
2757         /*
2758          * Convert from bytes to words, account for the two words already
2759          * written, make sure to leave two words at the end for the next
2760          * pointer and eof field.
2761          */
2762         maxcount = (maxcount >> 2) - 4;
2763         if (maxcount < 0) {
2764                 nfserr =  nfserr_toosmall;
2765                 goto err_no_verf;
2766         }
2767
2768         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2769         readdir->common.err = 0;
2770         readdir->buflen = maxcount;
2771         readdir->buffer = page;
2772         readdir->offset = NULL;
2773
2774         offset = readdir->rd_cookie;
2775         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2776                               &offset,
2777                               &readdir->common, nfsd4_encode_dirent);
2778         if (nfserr == nfs_ok &&
2779             readdir->common.err == nfserr_toosmall &&
2780             readdir->buffer == page)
2781                 nfserr = nfserr_toosmall;
2782         if (nfserr == nfserr_symlink)
2783                 nfserr = nfserr_notdir;
2784         if (nfserr)
2785                 goto err_no_verf;
2786
2787         if (readdir->offset)
2788                 xdr_encode_hyper(readdir->offset, offset);
2789
2790         p = readdir->buffer;
2791         *p++ = 0;       /* no more entries */
2792         *p++ = htonl(readdir->common.err == nfserr_eof);
2793         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2794                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2795
2796         /* Use rest of head for padding and remaining ops: */
2797         resp->xbuf->tail[0].iov_base = tailbase;
2798         resp->xbuf->tail[0].iov_len = 0;
2799         resp->p = resp->xbuf->tail[0].iov_base;
2800         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2801
2802         return 0;
2803 err_no_verf:
2804         p = savep;
2805         ADJUST_ARGS();
2806         return nfserr;
2807 }
2808
2809 static __be32
2810 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2811 {
2812         __be32 *p;
2813
2814         if (!nfserr) {
2815                 RESERVE_SPACE(20);
2816                 write_cinfo(&p, &remove->rm_cinfo);
2817                 ADJUST_ARGS();
2818         }
2819         return nfserr;
2820 }
2821
2822 static __be32
2823 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2824 {
2825         __be32 *p;
2826
2827         if (!nfserr) {
2828                 RESERVE_SPACE(40);
2829                 write_cinfo(&p, &rename->rn_sinfo);
2830                 write_cinfo(&p, &rename->rn_tinfo);
2831                 ADJUST_ARGS();
2832         }
2833         return nfserr;
2834 }
2835
2836 static __be32
2837 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2838                      struct nfsd4_secinfo *secinfo)
2839 {
2840         int i = 0;
2841         struct svc_export *exp = secinfo->si_exp;
2842         u32 nflavs;
2843         struct exp_flavor_info *flavs;
2844         struct exp_flavor_info def_flavs[2];
2845         __be32 *p;
2846
2847         if (nfserr)
2848                 goto out;
2849         if (exp->ex_nflavors) {
2850                 flavs = exp->ex_flavors;
2851                 nflavs = exp->ex_nflavors;
2852         } else { /* Handling of some defaults in absence of real secinfo: */
2853                 flavs = def_flavs;
2854                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2855                         nflavs = 2;
2856                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2857                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2858                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2859                         nflavs = 1;
2860                         flavs[0].pseudoflavor
2861                                         = svcauth_gss_flavor(exp->ex_client);
2862                 } else {
2863                         nflavs = 1;
2864                         flavs[0].pseudoflavor
2865                                         = exp->ex_client->flavour->flavour;
2866                 }
2867         }
2868
2869         RESERVE_SPACE(4);
2870         WRITE32(nflavs);
2871         ADJUST_ARGS();
2872         for (i = 0; i < nflavs; i++) {
2873                 u32 flav = flavs[i].pseudoflavor;
2874                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2875
2876                 if (gm) {
2877                         RESERVE_SPACE(4);
2878                         WRITE32(RPC_AUTH_GSS);
2879                         ADJUST_ARGS();
2880                         RESERVE_SPACE(4 + gm->gm_oid.len);
2881                         WRITE32(gm->gm_oid.len);
2882                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2883                         ADJUST_ARGS();
2884                         RESERVE_SPACE(4);
2885                         WRITE32(0); /* qop */
2886                         ADJUST_ARGS();
2887                         RESERVE_SPACE(4);
2888                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2889                         ADJUST_ARGS();
2890                         gss_mech_put(gm);
2891                 } else {
2892                         RESERVE_SPACE(4);
2893                         WRITE32(flav);
2894                         ADJUST_ARGS();
2895                 }
2896         }
2897 out:
2898         if (exp)
2899                 exp_put(exp);
2900         return nfserr;
2901 }
2902
2903 /*
2904  * The SETATTR encode routine is special -- it always encodes a bitmap,
2905  * regardless of the error status.
2906  */
2907 static __be32
2908 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2909 {
2910         __be32 *p;
2911
2912         RESERVE_SPACE(12);
2913         if (nfserr) {
2914                 WRITE32(2);
2915                 WRITE32(0);
2916                 WRITE32(0);
2917         }
2918         else {
2919                 WRITE32(2);
2920                 WRITE32(setattr->sa_bmval[0]);
2921                 WRITE32(setattr->sa_bmval[1]);
2922         }
2923         ADJUST_ARGS();
2924         return nfserr;
2925 }
2926
2927 static __be32
2928 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2929 {
2930         __be32 *p;
2931
2932         if (!nfserr) {
2933                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2934                 WRITEMEM(&scd->se_clientid, 8);
2935                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2936                 ADJUST_ARGS();
2937         }
2938         else if (nfserr == nfserr_clid_inuse) {
2939                 RESERVE_SPACE(8);
2940                 WRITE32(0);
2941                 WRITE32(0);
2942                 ADJUST_ARGS();
2943         }
2944         return nfserr;
2945 }
2946
2947 static __be32
2948 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2949 {
2950         __be32 *p;
2951
2952         if (!nfserr) {
2953                 RESERVE_SPACE(16);
2954                 WRITE32(write->wr_bytes_written);
2955                 WRITE32(write->wr_how_written);
2956                 WRITEMEM(write->wr_verifier.data, 8);
2957                 ADJUST_ARGS();
2958         }
2959         return nfserr;
2960 }
2961
2962 static __be32
2963 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2964                          struct nfsd4_exchange_id *exid)
2965 {
2966         __be32 *p;
2967         char *major_id;
2968         char *server_scope;
2969         int major_id_sz;
2970         int server_scope_sz;
2971         uint64_t minor_id = 0;
2972
2973         if (nfserr)
2974                 return nfserr;
2975
2976         major_id = utsname()->nodename;
2977         major_id_sz = strlen(major_id);
2978         server_scope = utsname()->nodename;
2979         server_scope_sz = strlen(server_scope);
2980
2981         RESERVE_SPACE(
2982                 8 /* eir_clientid */ +
2983                 4 /* eir_sequenceid */ +
2984                 4 /* eir_flags */ +
2985                 4 /* spr_how (SP4_NONE) */ +
2986                 8 /* so_minor_id */ +
2987                 4 /* so_major_id.len */ +
2988                 (XDR_QUADLEN(major_id_sz) * 4) +
2989                 4 /* eir_server_scope.len */ +
2990                 (XDR_QUADLEN(server_scope_sz) * 4) +
2991                 4 /* eir_server_impl_id.count (0) */);
2992
2993         WRITEMEM(&exid->clientid, 8);
2994         WRITE32(exid->seqid);
2995         WRITE32(exid->flags);
2996
2997         /* state_protect4_r. Currently only support SP4_NONE */
2998         BUG_ON(exid->spa_how != SP4_NONE);
2999         WRITE32(exid->spa_how);
3000
3001         /* The server_owner struct */
3002         WRITE64(minor_id);      /* Minor id */
3003         /* major id */
3004         WRITE32(major_id_sz);
3005         WRITEMEM(major_id, major_id_sz);
3006
3007         /* Server scope */
3008         WRITE32(server_scope_sz);
3009         WRITEMEM(server_scope, server_scope_sz);
3010
3011         /* Implementation id */
3012         WRITE32(0);     /* zero length nfs_impl_id4 array */
3013         ADJUST_ARGS();
3014         return 0;
3015 }
3016
3017 static __be32
3018 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3019                             struct nfsd4_create_session *sess)
3020 {
3021         __be32 *p;
3022
3023         if (nfserr)
3024                 return nfserr;
3025
3026         RESERVE_SPACE(24);
3027         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3028         WRITE32(sess->seqid);
3029         WRITE32(sess->flags);
3030         ADJUST_ARGS();
3031
3032         RESERVE_SPACE(28);
3033         WRITE32(0); /* headerpadsz */
3034         WRITE32(sess->fore_channel.maxreq_sz);
3035         WRITE32(sess->fore_channel.maxresp_sz);
3036         WRITE32(sess->fore_channel.maxresp_cached);
3037         WRITE32(sess->fore_channel.maxops);
3038         WRITE32(sess->fore_channel.maxreqs);
3039         WRITE32(sess->fore_channel.nr_rdma_attrs);
3040         ADJUST_ARGS();
3041
3042         if (sess->fore_channel.nr_rdma_attrs) {
3043                 RESERVE_SPACE(4);
3044                 WRITE32(sess->fore_channel.rdma_attrs);
3045                 ADJUST_ARGS();
3046         }
3047
3048         RESERVE_SPACE(28);
3049         WRITE32(0); /* headerpadsz */
3050         WRITE32(sess->back_channel.maxreq_sz);
3051         WRITE32(sess->back_channel.maxresp_sz);
3052         WRITE32(sess->back_channel.maxresp_cached);
3053         WRITE32(sess->back_channel.maxops);
3054         WRITE32(sess->back_channel.maxreqs);
3055         WRITE32(sess->back_channel.nr_rdma_attrs);
3056         ADJUST_ARGS();
3057
3058         if (sess->back_channel.nr_rdma_attrs) {
3059                 RESERVE_SPACE(4);
3060                 WRITE32(sess->back_channel.rdma_attrs);
3061                 ADJUST_ARGS();
3062         }
3063         return 0;
3064 }
3065
3066 static __be32
3067 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3068                              struct nfsd4_destroy_session *destroy_session)
3069 {
3070         return nfserr;
3071 }
3072
3073 __be32
3074 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3075                       struct nfsd4_sequence *seq)
3076 {
3077         __be32 *p;
3078
3079         if (nfserr)
3080                 return nfserr;
3081
3082         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3083         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3084         WRITE32(seq->seqid);
3085         WRITE32(seq->slotid);
3086         WRITE32(seq->maxslots);
3087         /*
3088          * FIXME: for now:
3089          *   target_maxslots = maxslots
3090          *   status_flags = 0
3091          */
3092         WRITE32(seq->maxslots);
3093         WRITE32(0);
3094
3095         ADJUST_ARGS();
3096         resp->cstate.datap = p; /* DRC cache data pointer */
3097         return 0;
3098 }
3099
3100 static __be32
3101 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3102 {
3103         return nfserr;
3104 }
3105
3106 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3107
3108 /*
3109  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3110  * since we don't need to filter out obsolete ops as this is
3111  * done in the decoding phase.
3112  */
3113 static nfsd4_enc nfsd4_enc_ops[] = {
3114         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3115         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3116         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3117         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3118         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3119         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3120         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3121         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3122         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3123         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3124         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3125         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3126         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3127         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3128         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3129         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3130         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3131         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3132         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3133         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3134         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3135         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3136         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3137         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3138         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3139         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3140         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3141         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3142         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3143         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3144         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3145         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3146         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3147         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3148         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3149         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3150         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3151
3152         /* NFSv4.1 operations */
3153         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3154         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3155         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3156         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3157         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3158         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3159         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3160         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3161         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3162         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3163         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3164         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3165         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
3166         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3167         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3168         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3169         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3170         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3171         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3172 };
3173
3174 /*
3175  * Calculate the total amount of memory that the compound response has taken
3176  * after encoding the current operation.
3177  *
3178  * pad: add on 8 bytes for the next operation's op_code and status so that
3179  * there is room to cache a failure on the next operation.
3180  *
3181  * Compare this length to the session se_fmaxresp_cached.
3182  *
3183  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3184  * will be at least a page and will therefore hold the xdr_buf head.
3185  */
3186 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3187 {
3188         int status = 0;
3189         struct xdr_buf *xb = &resp->rqstp->rq_res;
3190         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3191         struct nfsd4_session *session = NULL;
3192         struct nfsd4_slot *slot = resp->cstate.slot;
3193         u32 length, tlen = 0, pad = 8;
3194
3195         if (!nfsd4_has_session(&resp->cstate))
3196                 return status;
3197
3198         session = resp->cstate.session;
3199         if (session == NULL || slot->sl_cachethis == 0)
3200                 return status;
3201
3202         if (resp->opcnt >= args->opcnt)
3203                 pad = 0; /* this is the last operation */
3204
3205         if (xb->page_len == 0) {
3206                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3207         } else {
3208                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3209                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3210
3211                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3212         }
3213         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3214                 length, xb->page_len, tlen, pad);
3215
3216         if (length <= session->se_fchannel.maxresp_cached)
3217                 return status;
3218         else
3219                 return nfserr_rep_too_big_to_cache;
3220 }
3221
3222 void
3223 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3224 {
3225         __be32 *statp;
3226         __be32 *p;
3227
3228         RESERVE_SPACE(8);
3229         WRITE32(op->opnum);
3230         statp = p++;    /* to be backfilled at the end */
3231         ADJUST_ARGS();
3232
3233         if (op->opnum == OP_ILLEGAL)
3234                 goto status;
3235         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3236                !nfsd4_enc_ops[op->opnum]);
3237         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3238         /* nfsd4_check_drc_limit guarantees enough room for error status */
3239         if (!op->status && nfsd4_check_drc_limit(resp))
3240                 op->status = nfserr_rep_too_big_to_cache;
3241 status:
3242         /*
3243          * Note: We write the status directly, instead of using WRITE32(),
3244          * since it is already in network byte order.
3245          */
3246         *statp = op->status;
3247 }
3248
3249 /*
3250  * Encode the reply stored in the stateowner reply cache
3251  *
3252  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3253  * previously sent already encoded operation.
3254  *
3255  * called with nfs4_lock_state() held
3256  */
3257 void
3258 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3259 {
3260         __be32 *p;
3261         struct nfs4_replay *rp = op->replay;
3262
3263         BUG_ON(!rp);
3264
3265         RESERVE_SPACE(8);
3266         WRITE32(op->opnum);
3267         *p++ = rp->rp_status;  /* already xdr'ed */
3268         ADJUST_ARGS();
3269
3270         RESERVE_SPACE(rp->rp_buflen);
3271         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3272         ADJUST_ARGS();
3273 }
3274
3275 int
3276 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3277 {
3278         return xdr_ressize_check(rqstp, p);
3279 }
3280
3281 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3282 {
3283         if (args->ops != args->iops) {
3284                 kfree(args->ops);
3285                 args->ops = args->iops;
3286         }
3287         kfree(args->tmpp);
3288         args->tmpp = NULL;
3289         while (args->to_free) {
3290                 struct tmpbuf *tb = args->to_free;
3291                 args->to_free = tb->next;
3292                 tb->release(tb->buf);
3293                 kfree(tb);
3294         }
3295 }
3296
3297 int
3298 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3299 {
3300         __be32 status;
3301
3302         args->p = p;
3303         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3304         args->pagelist = rqstp->rq_arg.pages;
3305         args->pagelen = rqstp->rq_arg.page_len;
3306         args->tmpp = NULL;
3307         args->to_free = NULL;
3308         args->ops = args->iops;
3309         args->rqstp = rqstp;
3310
3311         status = nfsd4_decode_compound(args);
3312         if (status) {
3313                 nfsd4_release_compoundargs(args);
3314         }
3315         return !status;
3316 }
3317
3318 int
3319 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3320 {
3321         /*
3322          * All that remains is to write the tag and operation count...
3323          */
3324         struct nfsd4_compound_state *cs = &resp->cstate;
3325         struct kvec *iov;
3326         p = resp->tagp;
3327         *p++ = htonl(resp->taglen);
3328         memcpy(p, resp->tag, resp->taglen);
3329         p += XDR_QUADLEN(resp->taglen);
3330         *p++ = htonl(resp->opcnt);
3331
3332         if (rqstp->rq_res.page_len)
3333                 iov = &rqstp->rq_res.tail[0];
3334         else
3335                 iov = &rqstp->rq_res.head[0];
3336         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3337         BUG_ON(iov->iov_len > PAGE_SIZE);
3338         if (nfsd4_has_session(cs)) {
3339                 if (cs->status != nfserr_replay_cache) {
3340                         nfsd4_store_cache_entry(resp);
3341                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3342                         cs->slot->sl_inuse = false;
3343                 }
3344                 /* Renew the clientid on success and on replay */
3345                 release_session_client(cs->session);
3346                 nfsd4_put_session(cs->session);
3347         }
3348         return 1;
3349 }
3350
3351 /*
3352  * Local variables:
3353  *  c-basic-offset: 8
3354  * End:
3355  */