fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * TODO: Neil Brown made the following observation:  We currently
  36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37  * never release any of that until the request is complete.
  38  * It would be good to calculate a new maximum response size while
  39  * decoding the COMPOUND, and call svc_reserve with this number
  40  * at the end of nfs4svc_decode_compoundargs.
  41  */
  42
  43 #include <linux/slab.h>
  44 #include <linux/namei.h>
  45 #include <linux/statfs.h>
  46 #include <linux/utsname.h>
  47 #include <linux/sunrpc/svcauth_gss.h>
  48
  49 #include "idmap.h"
  50 #include "acl.h"
  51 #include "xdr4.h"
  52 #include "vfs.h"
  53
  54
  55 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  56
  57 /*
  58  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  59  * directory in order to indicate to the client that a filesystem boundary is present
  60  * We use a fixed fsid for a referral
  61  */
  62 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  63 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  64
  65 static __be32
  66 check_filename(char *str, int len, __be32 err)
  67 {
  68         int i;
  69
  70         if (len == 0)
  71                 return nfserr_inval;
  72         if (isdotent(str, len))
  73                 return err;
  74         for (i = 0; i < len; i++)
  75                 if (str[i] == '/')
  76                         return err;
  77         return 0;
  78 }
  79
  80 #define DECODE_HEAD                             \
  81         __be32 *p;                              \
  82         __be32 status
  83 #define DECODE_TAIL                             \
  84         status = 0;                             \
  85 out:                                            \
  86         return status;                          \
  87 xdr_error:                                      \
  88         dprintk("NFSD: xdr error (%s:%d)\n",    \
  89                         __FILE__, __LINE__);    \
  90         status = nfserr_bad_xdr;                \
  91         goto out
  92
  93 #define READ32(x)         (x) = ntohl(*p++)
  94 #define READ64(x)         do {                  \
  95         (x) = (u64)ntohl(*p++) << 32;           \
  96         (x) |= ntohl(*p++);                     \
  97 } while (0)
  98 #define READTIME(x)       do {                  \
  99         p++;                                    \
 100         (x) = ntohl(*p++);                      \
 101         p++;                                    \
 102 } while (0)
 103 #define READMEM(x,nbytes) do {                  \
 104         x = (char *)p;                          \
 105         p += XDR_QUADLEN(nbytes);               \
 106 } while (0)
 107 #define SAVEMEM(x,nbytes) do {                  \
 108         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 109                 savemem(argp, p, nbytes) :      \
 110                 (char *)p)) {                   \
 111                 dprintk("NFSD: xdr error (%s:%d)\n", \
 112                                 __FILE__, __LINE__); \
 113                 goto xdr_error;                 \
 114                 }                               \
 115         p += XDR_QUADLEN(nbytes);               \
 116 } while (0)
 117 #define COPYMEM(x,nbytes) do {                  \
 118         memcpy((x), p, nbytes);                 \
 119         p += XDR_QUADLEN(nbytes);               \
 120 } while (0)
 121
 122 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 123 #define READ_BUF(nbytes)  do {                  \
 124         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 125                 p = argp->p;                    \
 126                 argp->p += XDR_QUADLEN(nbytes); \
 127         } else if (!(p = read_buf(argp, nbytes))) { \
 128                 dprintk("NFSD: xdr error (%s:%d)\n", \
 129                                 __FILE__, __LINE__); \
 130                 goto xdr_error;                 \
 131         }                                       \
 132 } while (0)
 133
 134 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 135 {
 136         /* We want more bytes than seem to be available.
 137          * Maybe we need a new page, maybe we have just run out
 138          */
 139         unsigned int avail = (char *)argp->end - (char *)argp->p;
 140         __be32 *p;
 141         if (avail + argp->pagelen < nbytes)
 142                 return NULL;
 143         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 144                 return NULL;
 145         /* ok, we can do it with the current plus the next page */
 146         if (nbytes <= sizeof(argp->tmp))
 147                 p = argp->tmp;
 148         else {
 149                 kfree(argp->tmpp);
 150                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 151                 if (!p)
 152                         return NULL;
 153
 154         }
 155         /*
 156          * The following memcpy is safe because read_buf is always
 157          * called with nbytes > avail, and the two cases above both
 158          * guarantee p points to at least nbytes bytes.
 159          */
 160         memcpy(p, argp->p, avail);
 161         /* step to next page */
 162         argp->p = page_address(argp->pagelist[0]);
 163         argp->pagelist++;
 164         if (argp->pagelen < PAGE_SIZE) {
 165                 argp->end = argp->p + (argp->pagelen>>2);
 166                 argp->pagelen = 0;
 167         } else {
 168                 argp->end = argp->p + (PAGE_SIZE>>2);
 169                 argp->pagelen -= PAGE_SIZE;
 170         }
 171         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 172         argp->p += XDR_QUADLEN(nbytes - avail);
 173         return p;
 174 }
 175
 176 static int zero_clientid(clientid_t *clid)
 177 {
 178         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 179 }
 180
 181 static int
 182 defer_free(struct nfsd4_compoundargs *argp,
 183                 void (*release)(const void *), void *p)
 184 {
 185         struct tmpbuf *tb;
 186
 187         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 188         if (!tb)
 189                 return -ENOMEM;
 190         tb->buf = p;
 191         tb->release = release;
 192         tb->next = argp->to_free;
 193         argp->to_free = tb;
 194         return 0;
 195 }
 196
 197 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 198 {
 199         if (p == argp->tmp) {
 200                 p = kmalloc(nbytes, GFP_KERNEL);
 201                 if (!p)
 202                         return NULL;
 203                 memcpy(p, argp->tmp, nbytes);
 204         } else {
 205                 BUG_ON(p != argp->tmpp);
 206                 argp->tmpp = NULL;
 207         }
 208         if (defer_free(argp, kfree, p)) {
 209                 kfree(p);
 210                 return NULL;
 211         } else
 212                 return (char *)p;
 213 }
 214
 215 static __be32
 216 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 217 {
 218         u32 bmlen;
 219         DECODE_HEAD;
 220
 221         bmval[0] = 0;
 222         bmval[1] = 0;
 223         bmval[2] = 0;
 224
 225         READ_BUF(4);
 226         READ32(bmlen);
 227         if (bmlen > 1000)
 228                 goto xdr_error;
 229
 230         READ_BUF(bmlen << 2);
 231         if (bmlen > 0)
 232                 READ32(bmval[0]);
 233         if (bmlen > 1)
 234                 READ32(bmval[1]);
 235         if (bmlen > 2)
 236                 READ32(bmval[2]);
 237
 238         DECODE_TAIL;
 239 }
 240
 241 static __be32
 242 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 243                    struct iattr *iattr, struct nfs4_acl **acl)
 244 {
 245         int expected_len, len = 0;
 246         u32 dummy32;
 247         char *buf;
 248         int host_err;
 249
 250         DECODE_HEAD;
 251         iattr->ia_valid = 0;
 252         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 253                 return status;
 254
 255         READ_BUF(4);
 256         READ32(expected_len);
 257
 258         if (bmval[0] & FATTR4_WORD0_SIZE) {
 259                 READ_BUF(8);
 260                 len += 8;
 261                 READ64(iattr->ia_size);
 262                 iattr->ia_valid |= ATTR_SIZE;
 263         }
 264         if (bmval[0] & FATTR4_WORD0_ACL) {
 265                 int nace;
 266                 struct nfs4_ace *ace;
 267
 268                 READ_BUF(4); len += 4;
 269                 READ32(nace);
 270
 271                 if (nace > NFS4_ACL_MAX)
 272                         return nfserr_resource;
 273
 274                 *acl = nfs4_acl_new(nace);
 275                 if (*acl == NULL) {
 276                         host_err = -ENOMEM;
 277                         goto out_nfserr;
 278                 }
 279                 defer_free(argp, kfree, *acl);
 280
 281                 (*acl)->naces = nace;
 282                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 283                         READ_BUF(16); len += 16;
 284                         READ32(ace->type);
 285                         READ32(ace->flag);
 286                         READ32(ace->access_mask);
 287                         READ32(dummy32);
 288                         READ_BUF(dummy32);
 289                         len += XDR_QUADLEN(dummy32) << 2;
 290                         READMEM(buf, dummy32);
 291                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 292                         status = nfs_ok;
 293                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 294                                 ace->who = 0;
 295                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 296                                 status = nfsd_map_name_to_gid(argp->rqstp,
 297                                                 buf, dummy32, &ace->who);
 298                         else
 299                                 status = nfsd_map_name_to_uid(argp->rqstp,
 300                                                 buf, dummy32, &ace->who);
 301                         if (status)
 302                                 return status;
 303                 }
 304         } else
 305                 *acl = NULL;
 306         if (bmval[1] & FATTR4_WORD1_MODE) {
 307                 READ_BUF(4);
 308                 len += 4;
 309                 READ32(iattr->ia_mode);
 310                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 311                 iattr->ia_valid |= ATTR_MODE;
 312         }
 313         if (bmval[1] & FATTR4_WORD1_OWNER) {
 314                 READ_BUF(4);
 315                 len += 4;
 316                 READ32(dummy32);
 317                 READ_BUF(dummy32);
 318                 len += (XDR_QUADLEN(dummy32) << 2);
 319                 READMEM(buf, dummy32);
 320                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 321                         return status;
 322                 iattr->ia_valid |= ATTR_UID;
 323         }
 324         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 325                 READ_BUF(4);
 326                 len += 4;
 327                 READ32(dummy32);
 328                 READ_BUF(dummy32);
 329                 len += (XDR_QUADLEN(dummy32) << 2);
 330                 READMEM(buf, dummy32);
 331                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 332                         return status;
 333                 iattr->ia_valid |= ATTR_GID;
 334         }
 335         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 336                 READ_BUF(4);
 337                 len += 4;
 338                 READ32(dummy32);
 339                 switch (dummy32) {
 340                 case NFS4_SET_TO_CLIENT_TIME:
 341                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 342                            all 32 bits of 'nseconds'. */
 343                         READ_BUF(12);
 344                         len += 12;
 345                         READ32(dummy32);
 346                         if (dummy32)
 347                                 return nfserr_inval;
 348                         READ32(iattr->ia_atime.tv_sec);
 349                         READ32(iattr->ia_atime.tv_nsec);
 350                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 351                                 return nfserr_inval;
 352                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 353                         break;
 354                 case NFS4_SET_TO_SERVER_TIME:
 355                         iattr->ia_valid |= ATTR_ATIME;
 356                         break;
 357                 default:
 358                         goto xdr_error;
 359                 }
 360         }
 361         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 362                 READ_BUF(4);
 363                 len += 4;
 364                 READ32(dummy32);
 365                 switch (dummy32) {
 366                 case NFS4_SET_TO_CLIENT_TIME:
 367                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 368                            all 32 bits of 'nseconds'. */
 369                         READ_BUF(12);
 370                         len += 12;
 371                         READ32(dummy32);
 372                         if (dummy32)
 373                                 return nfserr_inval;
 374                         READ32(iattr->ia_mtime.tv_sec);
 375                         READ32(iattr->ia_mtime.tv_nsec);
 376                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 377                                 return nfserr_inval;
 378                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 379                         break;
 380                 case NFS4_SET_TO_SERVER_TIME:
 381                         iattr->ia_valid |= ATTR_MTIME;
 382                         break;
 383                 default:
 384                         goto xdr_error;
 385                 }
 386         }
 387         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 388             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 389             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 390                 READ_BUF(expected_len - len);
 391         else if (len != expected_len)
 392                 goto xdr_error;
 393
 394         DECODE_TAIL;
 395
 396 out_nfserr:
 397         status = nfserrno(host_err);
 398         goto out;
 399 }
 400
 401 static __be32
 402 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 403 {
 404         DECODE_HEAD;
 405
 406         READ_BUF(sizeof(stateid_t));
 407         READ32(sid->si_generation);
 408         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 409
 410         DECODE_TAIL;
 411 }
 412
 413 static __be32
 414 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 415 {
 416         DECODE_HEAD;
 417
 418         READ_BUF(4);
 419         READ32(access->ac_req_access);
 420
 421         DECODE_TAIL;
 422 }
 423
 424 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 425 {
 426         DECODE_HEAD;
 427         u32 dummy;
 428
 429         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 430         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 431         READ32(bcts->dir);
 432         /* XXX: Perhaps Tom Tucker could help us figure out how we
 433          * should be using ctsa_use_conn_in_rdma_mode: */
 434         READ32(dummy);
 435
 436         DECODE_TAIL;
 437 }
 438
 439 static __be32
 440 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 441 {
 442         DECODE_HEAD;
 443
 444         close->cl_stateowner = NULL;
 445         READ_BUF(4);
 446         READ32(close->cl_seqid);
 447         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 448
 449         DECODE_TAIL;
 450 }
 451
 452
 453 static __be32
 454 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 455 {
 456         DECODE_HEAD;
 457
 458         READ_BUF(12);
 459         READ64(commit->co_offset);
 460         READ32(commit->co_count);
 461
 462         DECODE_TAIL;
 463 }
 464
 465 static __be32
 466 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 467 {
 468         DECODE_HEAD;
 469
 470         READ_BUF(4);
 471         READ32(create->cr_type);
 472         switch (create->cr_type) {
 473         case NF4LNK:
 474                 READ_BUF(4);
 475                 READ32(create->cr_linklen);
 476                 READ_BUF(create->cr_linklen);
 477                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 478                 break;
 479         case NF4BLK:
 480         case NF4CHR:
 481                 READ_BUF(8);
 482                 READ32(create->cr_specdata1);
 483                 READ32(create->cr_specdata2);
 484                 break;
 485         case NF4SOCK:
 486         case NF4FIFO:
 487         case NF4DIR:
 488         default:
 489                 break;
 490         }
 491
 492         READ_BUF(4);
 493         READ32(create->cr_namelen);
 494         READ_BUF(create->cr_namelen);
 495         SAVEMEM(create->cr_name, create->cr_namelen);
 496         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 497                 return status;
 498
 499         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 500                                     &create->cr_acl);
 501         if (status)
 502                 goto out;
 503
 504         DECODE_TAIL;
 505 }
 506
 507 static inline __be32
 508 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 509 {
 510         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 511 }
 512
 513 static inline __be32
 514 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 515 {
 516         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 517 }
 518
 519 static __be32
 520 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 521 {
 522         DECODE_HEAD;
 523
 524         READ_BUF(4);
 525         READ32(link->li_namelen);
 526         READ_BUF(link->li_namelen);
 527         SAVEMEM(link->li_name, link->li_namelen);
 528         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 529                 return status;
 530
 531         DECODE_TAIL;
 532 }
 533
 534 static __be32
 535 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 536 {
 537         DECODE_HEAD;
 538
 539         lock->lk_replay_owner = NULL;
 540         /*
 541         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 542         */
 543         READ_BUF(28);
 544         READ32(lock->lk_type);
 545         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 546                 goto xdr_error;
 547         READ32(lock->lk_reclaim);
 548         READ64(lock->lk_offset);
 549         READ64(lock->lk_length);
 550         READ32(lock->lk_is_new);
 551
 552         if (lock->lk_is_new) {
 553                 READ_BUF(4);
 554                 READ32(lock->lk_new_open_seqid);
 555                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 556                 if (status)
 557                         return status;
 558                 READ_BUF(8 + sizeof(clientid_t));
 559                 READ32(lock->lk_new_lock_seqid);
 560                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 561                 READ32(lock->lk_new_owner.len);
 562                 READ_BUF(lock->lk_new_owner.len);
 563                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 564         } else {
 565                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 566                 if (status)
 567                         return status;
 568                 READ_BUF(4);
 569                 READ32(lock->lk_old_lock_seqid);
 570         }
 571
 572         DECODE_TAIL;
 573 }
 574
 575 static __be32
 576 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 577 {
 578         DECODE_HEAD;
 579
 580         READ_BUF(32);
 581         READ32(lockt->lt_type);
 582         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 583                 goto xdr_error;
 584         READ64(lockt->lt_offset);
 585         READ64(lockt->lt_length);
 586         COPYMEM(&lockt->lt_clientid, 8);
 587         READ32(lockt->lt_owner.len);
 588         READ_BUF(lockt->lt_owner.len);
 589         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 590
 591         if (argp->minorversion && !zero_clientid(&lockt->lt_clientid))
 592                 return nfserr_inval;
 593         DECODE_TAIL;
 594 }
 595
 596 static __be32
 597 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 598 {
 599         DECODE_HEAD;
 600
 601         locku->lu_stateowner = NULL;
 602         READ_BUF(8);
 603         READ32(locku->lu_type);
 604         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 605                 goto xdr_error;
 606         READ32(locku->lu_seqid);
 607         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 608         if (status)
 609                 return status;
 610         READ_BUF(16);
 611         READ64(locku->lu_offset);
 612         READ64(locku->lu_length);
 613
 614         DECODE_TAIL;
 615 }
 616
 617 static __be32
 618 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 619 {
 620         DECODE_HEAD;
 621
 622         READ_BUF(4);
 623         READ32(lookup->lo_len);
 624         READ_BUF(lookup->lo_len);
 625         SAVEMEM(lookup->lo_name, lookup->lo_len);
 626         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 627                 return status;
 628
 629         DECODE_TAIL;
 630 }
 631
 632 static __be32
 633 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 634 {
 635         DECODE_HEAD;
 636
 637         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 638         open->op_iattr.ia_valid = 0;
 639         open->op_stateowner = NULL;
 640
 641         /* seqid, share_access, share_deny, clientid, ownerlen */
 642         READ_BUF(16 + sizeof(clientid_t));
 643         READ32(open->op_seqid);
 644         READ32(open->op_share_access);
 645         READ32(open->op_share_deny);
 646         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 647         READ32(open->op_owner.len);
 648
 649         /* owner, open_flag */
 650         READ_BUF(open->op_owner.len + 4);
 651         SAVEMEM(open->op_owner.data, open->op_owner.len);
 652         READ32(open->op_create);
 653         switch (open->op_create) {
 654         case NFS4_OPEN_NOCREATE:
 655                 break;
 656         case NFS4_OPEN_CREATE:
 657                 READ_BUF(4);
 658                 READ32(open->op_createmode);
 659                 switch (open->op_createmode) {
 660                 case NFS4_CREATE_UNCHECKED:
 661                 case NFS4_CREATE_GUARDED:
 662                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 663                                 &open->op_iattr, &open->op_acl);
 664                         if (status)
 665                                 goto out;
 666                         break;
 667                 case NFS4_CREATE_EXCLUSIVE:
 668                         READ_BUF(8);
 669                         COPYMEM(open->op_verf.data, 8);
 670                         break;
 671                 case NFS4_CREATE_EXCLUSIVE4_1:
 672                         if (argp->minorversion < 1)
 673                                 goto xdr_error;
 674                         READ_BUF(8);
 675                         COPYMEM(open->op_verf.data, 8);
 676                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 677                                 &open->op_iattr, &open->op_acl);
 678                         if (status)
 679                                 goto out;
 680                         break;
 681                 default:
 682                         goto xdr_error;
 683                 }
 684                 break;
 685         default:
 686                 goto xdr_error;
 687         }
 688
 689         /* open_claim */
 690         READ_BUF(4);
 691         READ32(open->op_claim_type);
 692         switch (open->op_claim_type) {
 693         case NFS4_OPEN_CLAIM_NULL:
 694         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 695                 READ_BUF(4);
 696                 READ32(open->op_fname.len);
 697                 READ_BUF(open->op_fname.len);
 698                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 699                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 700                         return status;
 701                 break;
 702         case NFS4_OPEN_CLAIM_PREVIOUS:
 703                 READ_BUF(4);
 704                 READ32(open->op_delegate_type);
 705                 break;
 706         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 707                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 708                 if (status)
 709                         return status;
 710                 READ_BUF(4);
 711                 READ32(open->op_fname.len);
 712                 READ_BUF(open->op_fname.len);
 713                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 714                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 715                         return status;
 716                 break;
 717         default:
 718                 goto xdr_error;
 719         }
 720
 721         DECODE_TAIL;
 722 }
 723
 724 static __be32
 725 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 726 {
 727         DECODE_HEAD;
 728
 729         open_conf->oc_stateowner = NULL;
 730         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 731         if (status)
 732                 return status;
 733         READ_BUF(4);
 734         READ32(open_conf->oc_seqid);
 735
 736         DECODE_TAIL;
 737 }
 738
 739 static __be32
 740 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 741 {
 742         DECODE_HEAD;
 743
 744         open_down->od_stateowner = NULL;
 745         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 746         if (status)
 747                 return status;
 748         READ_BUF(12);
 749         READ32(open_down->od_seqid);
 750         READ32(open_down->od_share_access);
 751         READ32(open_down->od_share_deny);
 752
 753         DECODE_TAIL;
 754 }
 755
 756 static __be32
 757 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 758 {
 759         DECODE_HEAD;
 760
 761         READ_BUF(4);
 762         READ32(putfh->pf_fhlen);
 763         if (putfh->pf_fhlen > NFS4_FHSIZE)
 764                 goto xdr_error;
 765         READ_BUF(putfh->pf_fhlen);
 766         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 767
 768         DECODE_TAIL;
 769 }
 770
 771 static __be32
 772 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 773 {
 774         DECODE_HEAD;
 775
 776         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 777         if (status)
 778                 return status;
 779         READ_BUF(12);
 780         READ64(read->rd_offset);
 781         READ32(read->rd_length);
 782
 783         DECODE_TAIL;
 784 }
 785
 786 static __be32
 787 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 788 {
 789         DECODE_HEAD;
 790
 791         READ_BUF(24);
 792         READ64(readdir->rd_cookie);
 793         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 794         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 795         READ32(readdir->rd_maxcount);
 796         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 797                 goto out;
 798
 799         DECODE_TAIL;
 800 }
 801
 802 static __be32
 803 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 804 {
 805         DECODE_HEAD;
 806
 807         READ_BUF(4);
 808         READ32(remove->rm_namelen);
 809         READ_BUF(remove->rm_namelen);
 810         SAVEMEM(remove->rm_name, remove->rm_namelen);
 811         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 812                 return status;
 813
 814         DECODE_TAIL;
 815 }
 816
 817 static __be32
 818 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 819 {
 820         DECODE_HEAD;
 821
 822         READ_BUF(4);
 823         READ32(rename->rn_snamelen);
 824         READ_BUF(rename->rn_snamelen + 4);
 825         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 826         READ32(rename->rn_tnamelen);
 827         READ_BUF(rename->rn_tnamelen);
 828         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 829         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 830                 return status;
 831         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 832                 return status;
 833
 834         DECODE_TAIL;
 835 }
 836
 837 static __be32
 838 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 839 {
 840         DECODE_HEAD;
 841
 842         READ_BUF(sizeof(clientid_t));
 843         COPYMEM(clientid, sizeof(clientid_t));
 844
 845         DECODE_TAIL;
 846 }
 847
 848 static __be32
 849 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 850                      struct nfsd4_secinfo *secinfo)
 851 {
 852         DECODE_HEAD;
 853
 854         READ_BUF(4);
 855         READ32(secinfo->si_namelen);
 856         READ_BUF(secinfo->si_namelen);
 857         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 858         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 859                                                                 nfserr_noent);
 860         if (status)
 861                 return status;
 862         DECODE_TAIL;
 863 }
 864
 865 static __be32
 866 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
 867                      struct nfsd4_secinfo_no_name *sin)
 868 {
 869         DECODE_HEAD;
 870
 871         READ_BUF(4);
 872         READ32(sin->sin_style);
 873         DECODE_TAIL;
 874 }
 875
 876 static __be32
 877 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 878 {
 879         __be32 status;
 880
 881         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 882         if (status)
 883                 return status;
 884         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 885                                   &setattr->sa_acl);
 886 }
 887
 888 static __be32
 889 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 890 {
 891         DECODE_HEAD;
 892
 893         READ_BUF(12);
 894         COPYMEM(setclientid->se_verf.data, 8);
 895         READ32(setclientid->se_namelen);
 896
 897         READ_BUF(setclientid->se_namelen + 8);
 898         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 899         READ32(setclientid->se_callback_prog);
 900         READ32(setclientid->se_callback_netid_len);
 901
 902         READ_BUF(setclientid->se_callback_netid_len + 4);
 903         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 904         READ32(setclientid->se_callback_addr_len);
 905
 906         READ_BUF(setclientid->se_callback_addr_len + 4);
 907         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 908         READ32(setclientid->se_callback_ident);
 909
 910         DECODE_TAIL;
 911 }
 912
 913 static __be32
 914 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 915 {
 916         DECODE_HEAD;
 917
 918         READ_BUF(8 + sizeof(nfs4_verifier));
 919         COPYMEM(&scd_c->sc_clientid, 8);
 920         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 921
 922         DECODE_TAIL;
 923 }
 924
 925 /* Also used for NVERIFY */
 926 static __be32
 927 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 928 {
 929 #if 0
 930         struct nfsd4_compoundargs save = {
 931                 .p = argp->p,
 932                 .end = argp->end,
 933                 .rqstp = argp->rqstp,
 934         };
 935         u32             ve_bmval[2];
 936         struct iattr    ve_iattr;           /* request */
 937         struct nfs4_acl *ve_acl;            /* request */
 938 #endif
 939         DECODE_HEAD;
 940
 941         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 942                 goto out;
 943
 944         /* For convenience's sake, we compare raw xdr'd attributes in
 945          * nfsd4_proc_verify; however we still decode here just to return
 946          * correct error in case of bad xdr. */
 947 #if 0
 948         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 949         if (status == nfserr_inval) {
 950                 status = nfserrno(status);
 951                 goto out;
 952         }
 953 #endif
 954         READ_BUF(4);
 955         READ32(verify->ve_attrlen);
 956         READ_BUF(verify->ve_attrlen);
 957         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 958
 959         DECODE_TAIL;
 960 }
 961
 962 static __be32
 963 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 964 {
 965         int avail;
 966         int v;
 967         int len;
 968         DECODE_HEAD;
 969
 970         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
 971         if (status)
 972                 return status;
 973         READ_BUF(16);
 974         READ64(write->wr_offset);
 975         READ32(write->wr_stable_how);
 976         if (write->wr_stable_how > 2)
 977                 goto xdr_error;
 978         READ32(write->wr_buflen);
 979
 980         /* Sorry .. no magic macros for this.. *
 981          * READ_BUF(write->wr_buflen);
 982          * SAVEMEM(write->wr_buf, write->wr_buflen);
 983          */
 984         avail = (char*)argp->end - (char*)argp->p;
 985         if (avail + argp->pagelen < write->wr_buflen) {
 986                 dprintk("NFSD: xdr error (%s:%d)\n",
 987                                 __FILE__, __LINE__);
 988                 goto xdr_error;
 989         }
 990         argp->rqstp->rq_vec[0].iov_base = p;
 991         argp->rqstp->rq_vec[0].iov_len = avail;
 992         v = 0;
 993         len = write->wr_buflen;
 994         while (len > argp->rqstp->rq_vec[v].iov_len) {
 995                 len -= argp->rqstp->rq_vec[v].iov_len;
 996                 v++;
 997                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 998                 argp->pagelist++;
 999                 if (argp->pagelen >= PAGE_SIZE) {
1000                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1001                         argp->pagelen -= PAGE_SIZE;
1002                 } else {
1003                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
1004                         argp->pagelen -= len;
1005                 }
1006         }
1007         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1008         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1009         argp->rqstp->rq_vec[v].iov_len = len;
1010         write->wr_vlen = v+1;
1011
1012         DECODE_TAIL;
1013 }
1014
1015 static __be32
1016 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1017 {
1018         DECODE_HEAD;
1019
1020         READ_BUF(12);
1021         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1022         READ32(rlockowner->rl_owner.len);
1023         READ_BUF(rlockowner->rl_owner.len);
1024         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1025
1026         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1027                 return nfserr_inval;
1028         DECODE_TAIL;
1029 }
1030
1031 static __be32
1032 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1033                          struct nfsd4_exchange_id *exid)
1034 {
1035         int dummy, tmp;
1036         DECODE_HEAD;
1037
1038         READ_BUF(NFS4_VERIFIER_SIZE);
1039         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1040
1041         READ_BUF(4);
1042         READ32(exid->clname.len);
1043
1044         READ_BUF(exid->clname.len);
1045         SAVEMEM(exid->clname.data, exid->clname.len);
1046
1047         READ_BUF(4);
1048         READ32(exid->flags);
1049
1050         /* Ignore state_protect4_a */
1051         READ_BUF(4);
1052         READ32(exid->spa_how);
1053         switch (exid->spa_how) {
1054         case SP4_NONE:
1055                 break;
1056         case SP4_MACH_CRED:
1057                 /* spo_must_enforce */
1058                 READ_BUF(4);
1059                 READ32(dummy);
1060                 READ_BUF(dummy * 4);
1061                 p += dummy;
1062
1063                 /* spo_must_allow */
1064                 READ_BUF(4);
1065                 READ32(dummy);
1066                 READ_BUF(dummy * 4);
1067                 p += dummy;
1068                 break;
1069         case SP4_SSV:
1070                 /* ssp_ops */
1071                 READ_BUF(4);
1072                 READ32(dummy);
1073                 READ_BUF(dummy * 4);
1074                 p += dummy;
1075
1076                 READ_BUF(4);
1077                 READ32(dummy);
1078                 READ_BUF(dummy * 4);
1079                 p += dummy;
1080
1081                 /* ssp_hash_algs<> */
1082                 READ_BUF(4);
1083                 READ32(tmp);
1084                 while (tmp--) {
1085                         READ_BUF(4);
1086                         READ32(dummy);
1087                         READ_BUF(dummy);
1088                         p += XDR_QUADLEN(dummy);
1089                 }
1090
1091                 /* ssp_encr_algs<> */
1092                 READ_BUF(4);
1093                 READ32(tmp);
1094                 while (tmp--) {
1095                         READ_BUF(4);
1096                         READ32(dummy);
1097                         READ_BUF(dummy);
1098                         p += XDR_QUADLEN(dummy);
1099                 }
1100
1101                 /* ssp_window and ssp_num_gss_handles */
1102                 READ_BUF(8);
1103                 READ32(dummy);
1104                 READ32(dummy);
1105                 break;
1106         default:
1107                 goto xdr_error;
1108         }
1109
1110         /* Ignore Implementation ID */
1111         READ_BUF(4);    /* nfs_impl_id4 array length */
1112         READ32(dummy);
1113
1114         if (dummy > 1)
1115                 goto xdr_error;
1116
1117         if (dummy == 1) {
1118                 /* nii_domain */
1119                 READ_BUF(4);
1120                 READ32(dummy);
1121                 READ_BUF(dummy);
1122                 p += XDR_QUADLEN(dummy);
1123
1124                 /* nii_name */
1125                 READ_BUF(4);
1126                 READ32(dummy);
1127                 READ_BUF(dummy);
1128                 p += XDR_QUADLEN(dummy);
1129
1130                 /* nii_date */
1131                 READ_BUF(12);
1132                 p += 3;
1133         }
1134         DECODE_TAIL;
1135 }
1136
1137 static __be32
1138 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1139                             struct nfsd4_create_session *sess)
1140 {
1141         DECODE_HEAD;
1142
1143         u32 dummy;
1144         char *machine_name;
1145         int i;
1146         int nr_secflavs;
1147
1148         READ_BUF(16);
1149         COPYMEM(&sess->clientid, 8);
1150         READ32(sess->seqid);
1151         READ32(sess->flags);
1152
1153         /* Fore channel attrs */
1154         READ_BUF(28);
1155         READ32(dummy); /* headerpadsz is always 0 */
1156         READ32(sess->fore_channel.maxreq_sz);
1157         READ32(sess->fore_channel.maxresp_sz);
1158         READ32(sess->fore_channel.maxresp_cached);
1159         READ32(sess->fore_channel.maxops);
1160         READ32(sess->fore_channel.maxreqs);
1161         READ32(sess->fore_channel.nr_rdma_attrs);
1162         if (sess->fore_channel.nr_rdma_attrs == 1) {
1163                 READ_BUF(4);
1164                 READ32(sess->fore_channel.rdma_attrs);
1165         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1166                 dprintk("Too many fore channel attr bitmaps!\n");
1167                 goto xdr_error;
1168         }
1169
1170         /* Back channel attrs */
1171         READ_BUF(28);
1172         READ32(dummy); /* headerpadsz is always 0 */
1173         READ32(sess->back_channel.maxreq_sz);
1174         READ32(sess->back_channel.maxresp_sz);
1175         READ32(sess->back_channel.maxresp_cached);
1176         READ32(sess->back_channel.maxops);
1177         READ32(sess->back_channel.maxreqs);
1178         READ32(sess->back_channel.nr_rdma_attrs);
1179         if (sess->back_channel.nr_rdma_attrs == 1) {
1180                 READ_BUF(4);
1181                 READ32(sess->back_channel.rdma_attrs);
1182         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1183                 dprintk("Too many back channel attr bitmaps!\n");
1184                 goto xdr_error;
1185         }
1186
1187         READ_BUF(8);
1188         READ32(sess->callback_prog);
1189
1190         /* callback_sec_params4 */
1191         READ32(nr_secflavs);
1192         for (i = 0; i < nr_secflavs; ++i) {
1193                 READ_BUF(4);
1194                 READ32(dummy);
1195                 switch (dummy) {
1196                 case RPC_AUTH_NULL:
1197                         /* Nothing to read */
1198                         break;
1199                 case RPC_AUTH_UNIX:
1200                         READ_BUF(8);
1201                         /* stamp */
1202                         READ32(dummy);
1203
1204                         /* machine name */
1205                         READ32(dummy);
1206                         READ_BUF(dummy);
1207                         SAVEMEM(machine_name, dummy);
1208
1209                         /* uid, gid */
1210                         READ_BUF(8);
1211                         READ32(sess->uid);
1212                         READ32(sess->gid);
1213
1214                         /* more gids */
1215                         READ_BUF(4);
1216                         READ32(dummy);
1217                         READ_BUF(dummy * 4);
1218                         break;
1219                 case RPC_AUTH_GSS:
1220                         dprintk("RPC_AUTH_GSS callback secflavor "
1221                                 "not supported!\n");
1222                         READ_BUF(8);
1223                         /* gcbp_service */
1224                         READ32(dummy);
1225                         /* gcbp_handle_from_server */
1226                         READ32(dummy);
1227                         READ_BUF(dummy);
1228                         p += XDR_QUADLEN(dummy);
1229                         /* gcbp_handle_from_client */
1230                         READ_BUF(4);
1231                         READ32(dummy);
1232                         READ_BUF(dummy);
1233                         break;
1234                 default:
1235                         dprintk("Illegal callback secflavor\n");
1236                         return nfserr_inval;
1237                 }
1238         }
1239         DECODE_TAIL;
1240 }
1241
1242 static __be32
1243 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1244                              struct nfsd4_destroy_session *destroy_session)
1245 {
1246         DECODE_HEAD;
1247         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1248         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1249
1250         DECODE_TAIL;
1251 }
1252
1253 static __be32
1254 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1255                       struct nfsd4_sequence *seq)
1256 {
1257         DECODE_HEAD;
1258
1259         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1260         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1261         READ32(seq->seqid);
1262         READ32(seq->slotid);
1263         READ32(seq->maxslots);
1264         READ32(seq->cachethis);
1265
1266         DECODE_TAIL;
1267 }
1268
1269 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1270 {
1271         DECODE_HEAD;
1272
1273         READ_BUF(4);
1274         READ32(rc->rca_one_fs);
1275
1276         DECODE_TAIL;
1277 }
1278
1279 static __be32
1280 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1281 {
1282         return nfs_ok;
1283 }
1284
1285 static __be32
1286 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1287 {
1288         return nfserr_notsupp;
1289 }
1290
1291 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1292
1293 static nfsd4_dec nfsd4_dec_ops[] = {
1294         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1295         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1296         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1297         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1298         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1299         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1300         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1301         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1302         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1303         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1304         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1305         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1306         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1307         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1308         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1309         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1310         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1311         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1312         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1313         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1314         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1315         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1316         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1317         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1318         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1319         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1320         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1321         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1322         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1323         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1324         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1325         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1326         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1327         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1328         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1329         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1330         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1331 };
1332
1333 static nfsd4_dec nfsd41_dec_ops[] = {
1334         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1335         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1336         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1337         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1338         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1339         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1340         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1341         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1342         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1343         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1344         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1345         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1346         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1347         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1348         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1349         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1350         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1351         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1352         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1353         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1354         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1355         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1356         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1357         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1358         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1359         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1360         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1361         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1362         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1363         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1364         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1365         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1366         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1367         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1368         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1369         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1370         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1371
1372         /* new operations for NFSv4.1 */
1373         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1374         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1375         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1376         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1377         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1378         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1379         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1380         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1381         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1382         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1383         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1384         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1385         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1386         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1387         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1388         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1389         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1390         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_notsupp,
1391         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1392 };
1393
1394 struct nfsd4_minorversion_ops {
1395         nfsd4_dec *decoders;
1396         int nops;
1397 };
1398
1399 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1400         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1401         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1402 };
1403
1404 static __be32
1405 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1406 {
1407         DECODE_HEAD;
1408         struct nfsd4_op *op;
1409         struct nfsd4_minorversion_ops *ops;
1410         int i;
1411
1412         /*
1413          * XXX: According to spec, we should check the tag
1414          * for UTF-8 compliance.  I'm postponing this for
1415          * now because it seems that some clients do use
1416          * binary tags.
1417          */
1418         READ_BUF(4);
1419         READ32(argp->taglen);
1420         READ_BUF(argp->taglen + 8);
1421         SAVEMEM(argp->tag, argp->taglen);
1422         READ32(argp->minorversion);
1423         READ32(argp->opcnt);
1424
1425         if (argp->taglen > NFSD4_MAX_TAGLEN)
1426                 goto xdr_error;
1427         if (argp->opcnt > 100)
1428                 goto xdr_error;
1429
1430         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1431                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1432                 if (!argp->ops) {
1433                         argp->ops = argp->iops;
1434                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1435                         goto xdr_error;
1436                 }
1437         }
1438
1439         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1440                 argp->opcnt = 0;
1441
1442         ops = &nfsd4_minorversion[argp->minorversion];
1443         for (i = 0; i < argp->opcnt; i++) {
1444                 op = &argp->ops[i];
1445                 op->replay = NULL;
1446
1447                 /*
1448                  * We can't use READ_BUF() here because we need to handle
1449                  * a missing opcode as an OP_WRITE + 1. So we need to check
1450                  * to see if we're truly at the end of our buffer or if there
1451                  * is another page we need to flip to.
1452                  */
1453
1454                 if (argp->p == argp->end) {
1455                         if (argp->pagelen < 4) {
1456                                 /* There isn't an opcode still on the wire */
1457                                 op->opnum = OP_WRITE + 1;
1458                                 op->status = nfserr_bad_xdr;
1459                                 argp->opcnt = i+1;
1460                                 break;
1461                         }
1462
1463                         /*
1464                          * False alarm. We just hit a page boundary, but there
1465                          * is still data available.  Move pointer across page
1466                          * boundary.  *snip from READ_BUF*
1467                          */
1468                         argp->p = page_address(argp->pagelist[0]);
1469                         argp->pagelist++;
1470                         if (argp->pagelen < PAGE_SIZE) {
1471                                 argp->end = argp->p + (argp->pagelen>>2);
1472                                 argp->pagelen = 0;
1473                         } else {
1474                                 argp->end = argp->p + (PAGE_SIZE>>2);
1475                                 argp->pagelen -= PAGE_SIZE;
1476                         }
1477                 }
1478                 op->opnum = ntohl(*argp->p++);
1479
1480                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1481                         op->status = ops->decoders[op->opnum](argp, &op->u);
1482                 else {
1483                         op->opnum = OP_ILLEGAL;
1484                         op->status = nfserr_op_illegal;
1485                 }
1486
1487                 if (op->status) {
1488                         argp->opcnt = i+1;
1489                         break;
1490                 }
1491         }
1492
1493         DECODE_TAIL;
1494 }
1495
1496 #define WRITE32(n)               *p++ = htonl(n)
1497 #define WRITE64(n)               do {                           \
1498         *p++ = htonl((u32)((n) >> 32));                         \
1499         *p++ = htonl((u32)(n));                                 \
1500 } while (0)
1501 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1502         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1503         memcpy(p, ptr, nbytes);                                 \
1504         p += XDR_QUADLEN(nbytes);                               \
1505 }} while (0)
1506
1507 static void write32(__be32 **p, u32 n)
1508 {
1509         *(*p)++ = n;
1510 }
1511
1512 static void write64(__be32 **p, u64 n)
1513 {
1514         write32(p, (u32)(n >> 32));
1515         write32(p, (u32)n);
1516 }
1517
1518 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1519 {
1520         if (IS_I_VERSION(inode)) {
1521                 write64(p, inode->i_version);
1522         } else {
1523                 write32(p, stat->ctime.tv_sec);
1524                 write32(p, stat->ctime.tv_nsec);
1525         }
1526 }
1527
1528 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1529 {
1530         write32(p, c->atomic);
1531         if (c->change_supported) {
1532                 write64(p, c->before_change);
1533                 write64(p, c->after_change);
1534         } else {
1535                 write32(p, c->before_ctime_sec);
1536                 write32(p, c->before_ctime_nsec);
1537                 write32(p, c->after_ctime_sec);
1538                 write32(p, c->after_ctime_nsec);
1539         }
1540 }
1541
1542 #define RESERVE_SPACE(nbytes)   do {                            \
1543         p = resp->p;                                            \
1544         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1545 } while (0)
1546 #define ADJUST_ARGS()           resp->p = p
1547
1548 /*
1549  * Header routine to setup seqid operation replay cache
1550  */
1551 #define ENCODE_SEQID_OP_HEAD                                    \
1552         __be32 *save;                                           \
1553                                                                 \
1554         save = resp->p;
1555
1556 /*
1557  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1558  * is where sequence id's are incremented, and the replay cache is filled.
1559  * Note that we increment sequence id's here, at the last moment, so we're sure
1560  * we know whether the error to be returned is a sequence id mutating error.
1561  */
1562
1563 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1564         if (seqid_mutating_err(nfserr) && stateowner) {         \
1565                 stateowner->so_seqid++;                         \
1566                 stateowner->so_replay.rp_status = nfserr;       \
1567                 stateowner->so_replay.rp_buflen =               \
1568                           (((char *)(resp)->p - (char *)save)); \
1569                 memcpy(stateowner->so_replay.rp_buf, save,      \
1570                         stateowner->so_replay.rp_buflen);       \
1571         } } while (0);
1572
1573 /* Encode as an array of strings the string given with components
1574  * separated @sep.
1575  */
1576 static __be32 nfsd4_encode_components(char sep, char *components,
1577                                    __be32 **pp, int *buflen)
1578 {
1579         __be32 *p = *pp;
1580         __be32 *countp = p;
1581         int strlen, count=0;
1582         char *str, *end;
1583
1584         dprintk("nfsd4_encode_components(%s)\n", components);
1585         if ((*buflen -= 4) < 0)
1586                 return nfserr_resource;
1587         WRITE32(0); /* We will fill this in with @count later */
1588         end = str = components;
1589         while (*end) {
1590                 for (; *end && (*end != sep); end++)
1591                         ; /* Point to end of component */
1592                 strlen = end - str;
1593                 if (strlen) {
1594                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1595                                 return nfserr_resource;
1596                         WRITE32(strlen);
1597                         WRITEMEM(str, strlen);
1598                         count++;
1599                 }
1600                 else
1601                         end++;
1602                 str = end;
1603         }
1604         *pp = p;
1605         p = countp;
1606         WRITE32(count);
1607         return 0;
1608 }
1609
1610 /*
1611  * encode a location element of a fs_locations structure
1612  */
1613 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1614                                     __be32 **pp, int *buflen)
1615 {
1616         __be32 status;
1617         __be32 *p = *pp;
1618
1619         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1620         if (status)
1621                 return status;
1622         status = nfsd4_encode_components('/', location->path, &p, buflen);
1623         if (status)
1624                 return status;
1625         *pp = p;
1626         return 0;
1627 }
1628
1629 /*
1630  * Return the path to an export point in the pseudo filesystem namespace
1631  * Returned string is safe to use as long as the caller holds a reference
1632  * to @exp.
1633  */
1634 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1635 {
1636         struct svc_fh tmp_fh;
1637         char *path = NULL, *rootpath;
1638         size_t rootlen;
1639
1640         fh_init(&tmp_fh, NFS4_FHSIZE);
1641         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1642         if (*stat)
1643                 return NULL;
1644         rootpath = tmp_fh.fh_export->ex_pathname;
1645
1646         path = exp->ex_pathname;
1647
1648         rootlen = strlen(rootpath);
1649         if (strncmp(path, rootpath, rootlen)) {
1650                 dprintk("nfsd: fs_locations failed;"
1651                         "%s is not contained in %s\n", path, rootpath);
1652                 *stat = nfserr_notsupp;
1653                 path = NULL;
1654                 goto out;
1655         }
1656         path += rootlen;
1657 out:
1658         fh_put(&tmp_fh);
1659         return path;
1660 }
1661
1662 /*
1663  *  encode a fs_locations structure
1664  */
1665 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1666                                      struct svc_export *exp,
1667                                      __be32 **pp, int *buflen)
1668 {
1669         __be32 status;
1670         int i;
1671         __be32 *p = *pp;
1672         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1673         char *root = nfsd4_path(rqstp, exp, &status);
1674
1675         if (status)
1676                 return status;
1677         status = nfsd4_encode_components('/', root, &p, buflen);
1678         if (status)
1679                 return status;
1680         if ((*buflen -= 4) < 0)
1681                 return nfserr_resource;
1682         WRITE32(fslocs->locations_count);
1683         for (i=0; i<fslocs->locations_count; i++) {
1684                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1685                                                    &p, buflen);
1686                 if (status)
1687                         return status;
1688         }
1689         *pp = p;
1690         return 0;
1691 }
1692
1693 static u32 nfs4_ftypes[16] = {
1694         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1695         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1696         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1697         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1698 };
1699
1700 static __be32
1701 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1702                         __be32 **p, int *buflen)
1703 {
1704         int status;
1705
1706         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1707                 return nfserr_resource;
1708         if (whotype != NFS4_ACL_WHO_NAMED)
1709                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1710         else if (group)
1711                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1712         else
1713                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1714         if (status < 0)
1715                 return nfserrno(status);
1716         *p = xdr_encode_opaque(*p, NULL, status);
1717         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1718         BUG_ON(*buflen < 0);
1719         return 0;
1720 }
1721
1722 static inline __be32
1723 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1724 {
1725         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1726 }
1727
1728 static inline __be32
1729 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1730 {
1731         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1732 }
1733
1734 static inline __be32
1735 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1736                 __be32 **p, int *buflen)
1737 {
1738         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1739 }
1740
1741 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1742                               FATTR4_WORD0_RDATTR_ERROR)
1743 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1744
1745 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1746 {
1747         /* As per referral draft:  */
1748         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1749             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1750                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1751                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1752                         *rdattr_err = NFSERR_MOVED;
1753                 else
1754                         return nfserr_moved;
1755         }
1756         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1757         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1758         return 0;
1759 }
1760
1761 /*
1762  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1763  * ourselves.
1764  *
1765  * @countp is the buffer size in _words_; upon successful return this becomes
1766  * replaced with the number of words written.
1767  */
1768 __be32
1769 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1770                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1771                 struct svc_rqst *rqstp, int ignore_crossmnt)
1772 {
1773         u32 bmval0 = bmval[0];
1774         u32 bmval1 = bmval[1];
1775         u32 bmval2 = bmval[2];
1776         struct kstat stat;
1777         struct svc_fh tempfh;
1778         struct kstatfs statfs;
1779         int buflen = *countp << 2;
1780         __be32 *attrlenp;
1781         u32 dummy;
1782         u64 dummy64;
1783         u32 rdattr_err = 0;
1784         __be32 *p = buffer;
1785         __be32 status;
1786         int err;
1787         int aclsupport = 0;
1788         struct nfs4_acl *acl = NULL;
1789         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1790         u32 minorversion = resp->cstate.minorversion;
1791         struct path path = {
1792                 .mnt    = exp->ex_path.mnt,
1793                 .dentry = dentry,
1794         };
1795
1796         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1797         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1798         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1799         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1800
1801         if (exp->ex_fslocs.migrated) {
1802                 BUG_ON(bmval[2]);
1803                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1804                 if (status)
1805                         goto out;
1806         }
1807
1808         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1809         if (err)
1810                 goto out_nfserr;
1811         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1812                         FATTR4_WORD0_MAXNAME)) ||
1813             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1814                        FATTR4_WORD1_SPACE_TOTAL))) {
1815                 err = vfs_statfs(&path, &statfs);
1816                 if (err)
1817                         goto out_nfserr;
1818         }
1819         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1820                 fh_init(&tempfh, NFS4_FHSIZE);
1821                 status = fh_compose(&tempfh, exp, dentry, NULL);
1822                 if (status)
1823                         goto out;
1824                 fhp = &tempfh;
1825         }
1826         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1827                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1828                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1829                 aclsupport = (err == 0);
1830                 if (bmval0 & FATTR4_WORD0_ACL) {
1831                         if (err == -EOPNOTSUPP)
1832                                 bmval0 &= ~FATTR4_WORD0_ACL;
1833                         else if (err == -EINVAL) {
1834                                 status = nfserr_attrnotsupp;
1835                                 goto out;
1836                         } else if (err != 0)
1837                                 goto out_nfserr;
1838                 }
1839         }
1840
1841         if (bmval2) {
1842                 if ((buflen -= 16) < 0)
1843                         goto out_resource;
1844                 WRITE32(3);
1845                 WRITE32(bmval0);
1846                 WRITE32(bmval1);
1847                 WRITE32(bmval2);
1848         } else if (bmval1) {
1849                 if ((buflen -= 12) < 0)
1850                         goto out_resource;
1851                 WRITE32(2);
1852                 WRITE32(bmval0);
1853                 WRITE32(bmval1);
1854         } else {
1855                 if ((buflen -= 8) < 0)
1856                         goto out_resource;
1857                 WRITE32(1);
1858                 WRITE32(bmval0);
1859         }
1860         attrlenp = p++;                /* to be backfilled later */
1861
1862         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1863                 u32 word0 = nfsd_suppattrs0(minorversion);
1864                 u32 word1 = nfsd_suppattrs1(minorversion);
1865                 u32 word2 = nfsd_suppattrs2(minorversion);
1866
1867                 if (!aclsupport)
1868                         word0 &= ~FATTR4_WORD0_ACL;
1869                 if (!word2) {
1870                         if ((buflen -= 12) < 0)
1871                                 goto out_resource;
1872                         WRITE32(2);
1873                         WRITE32(word0);
1874                         WRITE32(word1);
1875                 } else {
1876                         if ((buflen -= 16) < 0)
1877                                 goto out_resource;
1878                         WRITE32(3);
1879                         WRITE32(word0);
1880                         WRITE32(word1);
1881                         WRITE32(word2);
1882                 }
1883         }
1884         if (bmval0 & FATTR4_WORD0_TYPE) {
1885                 if ((buflen -= 4) < 0)
1886                         goto out_resource;
1887                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1888                 if (dummy == NF4BAD)
1889                         goto out_serverfault;
1890                 WRITE32(dummy);
1891         }
1892         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1893                 if ((buflen -= 4) < 0)
1894                         goto out_resource;
1895                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1896                         WRITE32(NFS4_FH_PERSISTENT);
1897                 else
1898                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1899         }
1900         if (bmval0 & FATTR4_WORD0_CHANGE) {
1901                 if ((buflen -= 8) < 0)
1902                         goto out_resource;
1903                 write_change(&p, &stat, dentry->d_inode);
1904         }
1905         if (bmval0 & FATTR4_WORD0_SIZE) {
1906                 if ((buflen -= 8) < 0)
1907                         goto out_resource;
1908                 WRITE64(stat.size);
1909         }
1910         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1911                 if ((buflen -= 4) < 0)
1912                         goto out_resource;
1913                 WRITE32(1);
1914         }
1915         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1916                 if ((buflen -= 4) < 0)
1917                         goto out_resource;
1918                 WRITE32(1);
1919         }
1920         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1921                 if ((buflen -= 4) < 0)
1922                         goto out_resource;
1923                 WRITE32(0);
1924         }
1925         if (bmval0 & FATTR4_WORD0_FSID) {
1926                 if ((buflen -= 16) < 0)
1927                         goto out_resource;
1928                 if (exp->ex_fslocs.migrated) {
1929                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1930                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1931                 } else switch(fsid_source(fhp)) {
1932                 case FSIDSOURCE_FSID:
1933                         WRITE64((u64)exp->ex_fsid);
1934                         WRITE64((u64)0);
1935                         break;
1936                 case FSIDSOURCE_DEV:
1937                         WRITE32(0);
1938                         WRITE32(MAJOR(stat.dev));
1939                         WRITE32(0);
1940                         WRITE32(MINOR(stat.dev));
1941                         break;
1942                 case FSIDSOURCE_UUID:
1943                         WRITEMEM(exp->ex_uuid, 16);
1944                         break;
1945                 }
1946         }
1947         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1948                 if ((buflen -= 4) < 0)
1949                         goto out_resource;
1950                 WRITE32(0);
1951         }
1952         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1953                 if ((buflen -= 4) < 0)
1954                         goto out_resource;
1955                 WRITE32(nfsd4_lease);
1956         }
1957         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1958                 if ((buflen -= 4) < 0)
1959                         goto out_resource;
1960                 WRITE32(rdattr_err);
1961         }
1962         if (bmval0 & FATTR4_WORD0_ACL) {
1963                 struct nfs4_ace *ace;
1964
1965                 if (acl == NULL) {
1966                         if ((buflen -= 4) < 0)
1967                                 goto out_resource;
1968
1969                         WRITE32(0);
1970                         goto out_acl;
1971                 }
1972                 if ((buflen -= 4) < 0)
1973                         goto out_resource;
1974                 WRITE32(acl->naces);
1975
1976                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1977                         if ((buflen -= 4*3) < 0)
1978                                 goto out_resource;
1979                         WRITE32(ace->type);
1980                         WRITE32(ace->flag);
1981                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1982                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1983                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1984                                 &p, &buflen);
1985                         if (status == nfserr_resource)
1986                                 goto out_resource;
1987                         if (status)
1988                                 goto out;
1989                 }
1990         }
1991 out_acl:
1992         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1993                 if ((buflen -= 4) < 0)
1994                         goto out_resource;
1995                 WRITE32(aclsupport ?
1996                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1997         }
1998         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1999                 if ((buflen -= 4) < 0)
2000                         goto out_resource;
2001                 WRITE32(1);
2002         }
2003         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2004                 if ((buflen -= 4) < 0)
2005                         goto out_resource;
2006                 WRITE32(1);
2007         }
2008         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2009                 if ((buflen -= 4) < 0)
2010                         goto out_resource;
2011                 WRITE32(1);
2012         }
2013         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2014                 if ((buflen -= 4) < 0)
2015                         goto out_resource;
2016                 WRITE32(1);
2017         }
2018         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2019                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2020                 if (buflen < 0)
2021                         goto out_resource;
2022                 WRITE32(fhp->fh_handle.fh_size);
2023                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2024         }
2025         if (bmval0 & FATTR4_WORD0_FILEID) {
2026                 if ((buflen -= 8) < 0)
2027                         goto out_resource;
2028                 WRITE64(stat.ino);
2029         }
2030         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2031                 if ((buflen -= 8) < 0)
2032                         goto out_resource;
2033                 WRITE64((u64) statfs.f_ffree);
2034         }
2035         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2036                 if ((buflen -= 8) < 0)
2037                         goto out_resource;
2038                 WRITE64((u64) statfs.f_ffree);
2039         }
2040         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2041                 if ((buflen -= 8) < 0)
2042                         goto out_resource;
2043                 WRITE64((u64) statfs.f_files);
2044         }
2045         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2046                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2047                 if (status == nfserr_resource)
2048                         goto out_resource;
2049                 if (status)
2050                         goto out;
2051         }
2052         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2053                 if ((buflen -= 4) < 0)
2054                         goto out_resource;
2055                 WRITE32(1);
2056         }
2057         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2058                 if ((buflen -= 8) < 0)
2059                         goto out_resource;
2060                 WRITE64(~(u64)0);
2061         }
2062         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2063                 if ((buflen -= 4) < 0)
2064                         goto out_resource;
2065                 WRITE32(255);
2066         }
2067         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2068                 if ((buflen -= 4) < 0)
2069                         goto out_resource;
2070                 WRITE32(statfs.f_namelen);
2071         }
2072         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2073                 if ((buflen -= 8) < 0)
2074                         goto out_resource;
2075                 WRITE64((u64) svc_max_payload(rqstp));
2076         }
2077         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2078                 if ((buflen -= 8) < 0)
2079                         goto out_resource;
2080                 WRITE64((u64) svc_max_payload(rqstp));
2081         }
2082         if (bmval1 & FATTR4_WORD1_MODE) {
2083                 if ((buflen -= 4) < 0)
2084                         goto out_resource;
2085                 WRITE32(stat.mode & S_IALLUGO);
2086         }
2087         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2088                 if ((buflen -= 4) < 0)
2089                         goto out_resource;
2090                 WRITE32(1);
2091         }
2092         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2093                 if ((buflen -= 4) < 0)
2094                         goto out_resource;
2095                 WRITE32(stat.nlink);
2096         }
2097         if (bmval1 & FATTR4_WORD1_OWNER) {
2098                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2099                 if (status == nfserr_resource)
2100                         goto out_resource;
2101                 if (status)
2102                         goto out;
2103         }
2104         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2105                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2106                 if (status == nfserr_resource)
2107                         goto out_resource;
2108                 if (status)
2109                         goto out;
2110         }
2111         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2112                 if ((buflen -= 8) < 0)
2113                         goto out_resource;
2114                 WRITE32((u32) MAJOR(stat.rdev));
2115                 WRITE32((u32) MINOR(stat.rdev));
2116         }
2117         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2118                 if ((buflen -= 8) < 0)
2119                         goto out_resource;
2120                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2121                 WRITE64(dummy64);
2122         }
2123         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2124                 if ((buflen -= 8) < 0)
2125                         goto out_resource;
2126                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2127                 WRITE64(dummy64);
2128         }
2129         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2130                 if ((buflen -= 8) < 0)
2131                         goto out_resource;
2132                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2133                 WRITE64(dummy64);
2134         }
2135         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2136                 if ((buflen -= 8) < 0)
2137                         goto out_resource;
2138                 dummy64 = (u64)stat.blocks << 9;
2139                 WRITE64(dummy64);
2140         }
2141         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2142                 if ((buflen -= 12) < 0)
2143                         goto out_resource;
2144                 WRITE32(0);
2145                 WRITE32(stat.atime.tv_sec);
2146                 WRITE32(stat.atime.tv_nsec);
2147         }
2148         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2149                 if ((buflen -= 12) < 0)
2150                         goto out_resource;
2151                 WRITE32(0);
2152                 WRITE32(1);
2153                 WRITE32(0);
2154         }
2155         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2156                 if ((buflen -= 12) < 0)
2157                         goto out_resource;
2158                 WRITE32(0);
2159                 WRITE32(stat.ctime.tv_sec);
2160                 WRITE32(stat.ctime.tv_nsec);
2161         }
2162         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2163                 if ((buflen -= 12) < 0)
2164                         goto out_resource;
2165                 WRITE32(0);
2166                 WRITE32(stat.mtime.tv_sec);
2167                 WRITE32(stat.mtime.tv_nsec);
2168         }
2169         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2170                 if ((buflen -= 8) < 0)
2171                         goto out_resource;
2172                 /*
2173                  * Get parent's attributes if not ignoring crossmount
2174                  * and this is the root of a cross-mounted filesystem.
2175                  */
2176                 if (ignore_crossmnt == 0 &&
2177                     dentry == exp->ex_path.mnt->mnt_root) {
2178                         struct path path = exp->ex_path;
2179                         path_get(&path);
2180                         while (follow_up(&path)) {
2181                                 if (path.dentry != path.mnt->mnt_root)
2182                                         break;
2183                         }
2184                         err = vfs_getattr(path.mnt, path.dentry, &stat);
2185                         path_put(&path);
2186                         if (err)
2187                                 goto out_nfserr;
2188                 }
2189                 WRITE64(stat.ino);
2190         }
2191         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2192                 WRITE32(3);
2193                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2194                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2195                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2196         }
2197
2198         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2199         *countp = p - buffer;
2200         status = nfs_ok;
2201
2202 out:
2203         kfree(acl);
2204         if (fhp == &tempfh)
2205                 fh_put(&tempfh);
2206         return status;
2207 out_nfserr:
2208         status = nfserrno(err);
2209         goto out;
2210 out_resource:
2211         *countp = 0;
2212         status = nfserr_resource;
2213         goto out;
2214 out_serverfault:
2215         status = nfserr_serverfault;
2216         goto out;
2217 }
2218
2219 static inline int attributes_need_mount(u32 *bmval)
2220 {
2221         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2222                 return 1;
2223         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2224                 return 1;
2225         return 0;
2226 }
2227
2228 static __be32
2229 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2230                 const char *name, int namlen, __be32 *p, int *buflen)
2231 {
2232         struct svc_export *exp = cd->rd_fhp->fh_export;
2233         struct dentry *dentry;
2234         __be32 nfserr;
2235         int ignore_crossmnt = 0;
2236
2237         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2238         if (IS_ERR(dentry))
2239                 return nfserrno(PTR_ERR(dentry));
2240         if (!dentry->d_inode) {
2241                 /*
2242                  * nfsd_buffered_readdir drops the i_mutex between
2243                  * readdir and calling this callback, leaving a window
2244                  * where this directory entry could have gone away.
2245                  */
2246                 dput(dentry);
2247                 return nfserr_noent;
2248         }
2249
2250         exp_get(exp);
2251         /*
2252          * In the case of a mountpoint, the client may be asking for
2253          * attributes that are only properties of the underlying filesystem
2254          * as opposed to the cross-mounted file system. In such a case,
2255          * we will not follow the cross mount and will fill the attribtutes
2256          * directly from the mountpoint dentry.
2257          */
2258         if (nfsd_mountpoint(dentry, exp)) {
2259                 int err;
2260
2261                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2262                                 && !attributes_need_mount(cd->rd_bmval)) {
2263                         ignore_crossmnt = 1;
2264                         goto out_encode;
2265                 }
2266                 /*
2267                  * Why the heck aren't we just using nfsd_lookup??
2268                  * Different "."/".." handling?  Something else?
2269                  * At least, add a comment here to explain....
2270                  */
2271                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2272                 if (err) {
2273                         nfserr = nfserrno(err);
2274                         goto out_put;
2275                 }
2276                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2277                 if (nfserr)
2278                         goto out_put;
2279
2280         }
2281 out_encode:
2282         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2283                                         cd->rd_rqstp, ignore_crossmnt);
2284 out_put:
2285         dput(dentry);
2286         exp_put(exp);
2287         return nfserr;
2288 }
2289
2290 static __be32 *
2291 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2292 {
2293         __be32 *attrlenp;
2294
2295         if (buflen < 6)
2296                 return NULL;
2297         *p++ = htonl(2);
2298         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2299         *p++ = htonl(0);                         /* bmval1 */
2300
2301         attrlenp = p++;
2302         *p++ = nfserr;       /* no htonl */
2303         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2304         return p;
2305 }
2306
2307 static int
2308 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2309                     loff_t offset, u64 ino, unsigned int d_type)
2310 {
2311         struct readdir_cd *ccd = ccdv;
2312         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2313         int buflen;
2314         __be32 *p = cd->buffer;
2315         __be32 *cookiep;
2316         __be32 nfserr = nfserr_toosmall;
2317
2318         /* In nfsv4, "." and ".." never make it onto the wire.. */
2319         if (name && isdotent(name, namlen)) {
2320                 cd->common.err = nfs_ok;
2321                 return 0;
2322         }
2323
2324         if (cd->offset)
2325                 xdr_encode_hyper(cd->offset, (u64) offset);
2326
2327         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2328         if (buflen < 0)
2329                 goto fail;
2330
2331         *p++ = xdr_one;                             /* mark entry present */
2332         cookiep = p;
2333         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2334         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2335
2336         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2337         switch (nfserr) {
2338         case nfs_ok:
2339                 p += buflen;
2340                 break;
2341         case nfserr_resource:
2342                 nfserr = nfserr_toosmall;
2343                 goto fail;
2344         case nfserr_noent:
2345                 goto skip_entry;
2346         default:
2347                 /*
2348                  * If the client requested the RDATTR_ERROR attribute,
2349                  * we stuff the error code into this attribute
2350                  * and continue.  If this attribute was not requested,
2351                  * then in accordance with the spec, we fail the
2352                  * entire READDIR operation(!)
2353                  */
2354                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2355                         goto fail;
2356                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2357                 if (p == NULL) {
2358                         nfserr = nfserr_toosmall;
2359                         goto fail;
2360                 }
2361         }
2362         cd->buflen -= (p - cd->buffer);
2363         cd->buffer = p;
2364         cd->offset = cookiep;
2365 skip_entry:
2366         cd->common.err = nfs_ok;
2367         return 0;
2368 fail:
2369         cd->common.err = nfserr;
2370         return -EINVAL;
2371 }
2372
2373 static void
2374 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2375 {
2376         __be32 *p;
2377
2378         RESERVE_SPACE(sizeof(stateid_t));
2379         WRITE32(sid->si_generation);
2380         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2381         ADJUST_ARGS();
2382 }
2383
2384 static __be32
2385 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2386 {
2387         __be32 *p;
2388
2389         if (!nfserr) {
2390                 RESERVE_SPACE(8);
2391                 WRITE32(access->ac_supported);
2392                 WRITE32(access->ac_resp_access);
2393                 ADJUST_ARGS();
2394         }
2395         return nfserr;
2396 }
2397
2398 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2399 {
2400         __be32 *p;
2401
2402         if (!nfserr) {
2403                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2404                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2405                 WRITE32(bcts->dir);
2406                 /* XXX: ? */
2407                 WRITE32(0);
2408                 ADJUST_ARGS();
2409         }
2410         return nfserr;
2411 }
2412
2413 static __be32
2414 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2415 {
2416         ENCODE_SEQID_OP_HEAD;
2417
2418         if (!nfserr)
2419                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2420
2421         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2422         return nfserr;
2423 }
2424
2425
2426 static __be32
2427 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2428 {
2429         __be32 *p;
2430
2431         if (!nfserr) {
2432                 RESERVE_SPACE(8);
2433                 WRITEMEM(commit->co_verf.data, 8);
2434                 ADJUST_ARGS();
2435         }
2436         return nfserr;
2437 }
2438
2439 static __be32
2440 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2441 {
2442         __be32 *p;
2443
2444         if (!nfserr) {
2445                 RESERVE_SPACE(32);
2446                 write_cinfo(&p, &create->cr_cinfo);
2447                 WRITE32(2);
2448                 WRITE32(create->cr_bmval[0]);
2449                 WRITE32(create->cr_bmval[1]);
2450                 ADJUST_ARGS();
2451         }
2452         return nfserr;
2453 }
2454
2455 static __be32
2456 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2457 {
2458         struct svc_fh *fhp = getattr->ga_fhp;
2459         int buflen;
2460
2461         if (nfserr)
2462                 return nfserr;
2463
2464         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2465         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2466                                     resp->p, &buflen, getattr->ga_bmval,
2467                                     resp->rqstp, 0);
2468         if (!nfserr)
2469                 resp->p += buflen;
2470         return nfserr;
2471 }
2472
2473 static __be32
2474 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2475 {
2476         struct svc_fh *fhp = *fhpp;
2477         unsigned int len;
2478         __be32 *p;
2479
2480         if (!nfserr) {
2481                 len = fhp->fh_handle.fh_size;
2482                 RESERVE_SPACE(len + 4);
2483                 WRITE32(len);
2484                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2485                 ADJUST_ARGS();
2486         }
2487         return nfserr;
2488 }
2489
2490 /*
2491 * Including all fields other than the name, a LOCK4denied structure requires
2492 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2493 */
2494 static void
2495 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2496 {
2497         __be32 *p;
2498
2499         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2500         WRITE64(ld->ld_start);
2501         WRITE64(ld->ld_length);
2502         WRITE32(ld->ld_type);
2503         if (ld->ld_sop) {
2504                 WRITEMEM(&ld->ld_clientid, 8);
2505                 WRITE32(ld->ld_sop->so_owner.len);
2506                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2507                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2508         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2509                 WRITE64((u64)0); /* clientid */
2510                 WRITE32(0); /* length of owner name */
2511         }
2512         ADJUST_ARGS();
2513 }
2514
2515 static __be32
2516 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2517 {
2518         ENCODE_SEQID_OP_HEAD;
2519
2520         if (!nfserr)
2521                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2522         else if (nfserr == nfserr_denied)
2523                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2524
2525         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2526         return nfserr;
2527 }
2528
2529 static __be32
2530 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2531 {
2532         if (nfserr == nfserr_denied)
2533                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2534         return nfserr;
2535 }
2536
2537 static __be32
2538 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2539 {
2540         ENCODE_SEQID_OP_HEAD;
2541
2542         if (!nfserr)
2543                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2544
2545         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2546         return nfserr;
2547 }
2548
2549
2550 static __be32
2551 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2552 {
2553         __be32 *p;
2554
2555         if (!nfserr) {
2556                 RESERVE_SPACE(20);
2557                 write_cinfo(&p, &link->li_cinfo);
2558                 ADJUST_ARGS();
2559         }
2560         return nfserr;
2561 }
2562
2563
2564 static __be32
2565 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2566 {
2567         __be32 *p;
2568         ENCODE_SEQID_OP_HEAD;
2569
2570         if (nfserr)
2571                 goto out;
2572
2573         nfsd4_encode_stateid(resp, &open->op_stateid);
2574         RESERVE_SPACE(40);
2575         write_cinfo(&p, &open->op_cinfo);
2576         WRITE32(open->op_rflags);
2577         WRITE32(2);
2578         WRITE32(open->op_bmval[0]);
2579         WRITE32(open->op_bmval[1]);
2580         WRITE32(open->op_delegate_type);
2581         ADJUST_ARGS();
2582
2583         switch (open->op_delegate_type) {
2584         case NFS4_OPEN_DELEGATE_NONE:
2585                 break;
2586         case NFS4_OPEN_DELEGATE_READ:
2587                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2588                 RESERVE_SPACE(20);
2589                 WRITE32(open->op_recall);
2590
2591                 /*
2592                  * TODO: ACE's in delegations
2593                  */
2594                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2595                 WRITE32(0);
2596                 WRITE32(0);
2597                 WRITE32(0);   /* XXX: is NULL principal ok? */
2598                 ADJUST_ARGS();
2599                 break;
2600         case NFS4_OPEN_DELEGATE_WRITE:
2601                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2602                 RESERVE_SPACE(32);
2603                 WRITE32(0);
2604
2605                 /*
2606                  * TODO: space_limit's in delegations
2607                  */
2608                 WRITE32(NFS4_LIMIT_SIZE);
2609                 WRITE32(~(u32)0);
2610                 WRITE32(~(u32)0);
2611
2612                 /*
2613                  * TODO: ACE's in delegations
2614                  */
2615                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2616                 WRITE32(0);
2617                 WRITE32(0);
2618                 WRITE32(0);   /* XXX: is NULL principal ok? */
2619                 ADJUST_ARGS();
2620                 break;
2621         default:
2622                 BUG();
2623         }
2624         /* XXX save filehandle here */
2625 out:
2626         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2627         return nfserr;
2628 }
2629
2630 static __be32
2631 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2632 {
2633         ENCODE_SEQID_OP_HEAD;
2634
2635         if (!nfserr)
2636                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2637
2638         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2639         return nfserr;
2640 }
2641
2642 static __be32
2643 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2644 {
2645         ENCODE_SEQID_OP_HEAD;
2646
2647         if (!nfserr)
2648                 nfsd4_encode_stateid(resp, &od->od_stateid);
2649
2650         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2651         return nfserr;
2652 }
2653
2654 static __be32
2655 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2656                   struct nfsd4_read *read)
2657 {
2658         u32 eof;
2659         int v, pn;
2660         unsigned long maxcount;
2661         long len;
2662         __be32 *p;
2663
2664         if (nfserr)
2665                 return nfserr;
2666         if (resp->xbuf->page_len)
2667                 return nfserr_resource;
2668
2669         RESERVE_SPACE(8); /* eof flag and byte count */
2670
2671         maxcount = svc_max_payload(resp->rqstp);
2672         if (maxcount > read->rd_length)
2673                 maxcount = read->rd_length;
2674
2675         len = maxcount;
2676         v = 0;
2677         while (len > 0) {
2678                 pn = resp->rqstp->rq_resused++;
2679                 resp->rqstp->rq_vec[v].iov_base =
2680                         page_address(resp->rqstp->rq_respages[pn]);
2681                 resp->rqstp->rq_vec[v].iov_len =
2682                         len < PAGE_SIZE ? len : PAGE_SIZE;
2683                 v++;
2684                 len -= PAGE_SIZE;
2685         }
2686         read->rd_vlen = v;
2687
2688         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2689                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2690                         &maxcount);
2691
2692         if (nfserr == nfserr_symlink)
2693                 nfserr = nfserr_inval;
2694         if (nfserr)
2695                 return nfserr;
2696         eof = (read->rd_offset + maxcount >=
2697                read->rd_fhp->fh_dentry->d_inode->i_size);
2698
2699         WRITE32(eof);
2700         WRITE32(maxcount);
2701         ADJUST_ARGS();
2702         resp->xbuf->head[0].iov_len = (char*)p
2703                                         - (char*)resp->xbuf->head[0].iov_base;
2704         resp->xbuf->page_len = maxcount;
2705
2706         /* Use rest of head for padding and remaining ops: */
2707         resp->xbuf->tail[0].iov_base = p;
2708         resp->xbuf->tail[0].iov_len = 0;
2709         if (maxcount&3) {
2710                 RESERVE_SPACE(4);
2711                 WRITE32(0);
2712                 resp->xbuf->tail[0].iov_base += maxcount&3;
2713                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2714                 ADJUST_ARGS();
2715         }
2716         return 0;
2717 }
2718
2719 static __be32
2720 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2721 {
2722         int maxcount;
2723         char *page;
2724         __be32 *p;
2725
2726         if (nfserr)
2727                 return nfserr;
2728         if (resp->xbuf->page_len)
2729                 return nfserr_resource;
2730
2731         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2732
2733         maxcount = PAGE_SIZE;
2734         RESERVE_SPACE(4);
2735
2736         /*
2737          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2738          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2739          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2740          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2741          */
2742         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2743         if (nfserr == nfserr_isdir)
2744                 return nfserr_inval;
2745         if (nfserr)
2746                 return nfserr;
2747
2748         WRITE32(maxcount);
2749         ADJUST_ARGS();
2750         resp->xbuf->head[0].iov_len = (char*)p
2751                                 - (char*)resp->xbuf->head[0].iov_base;
2752         resp->xbuf->page_len = maxcount;
2753
2754         /* Use rest of head for padding and remaining ops: */
2755         resp->xbuf->tail[0].iov_base = p;
2756         resp->xbuf->tail[0].iov_len = 0;
2757         if (maxcount&3) {
2758                 RESERVE_SPACE(4);
2759                 WRITE32(0);
2760                 resp->xbuf->tail[0].iov_base += maxcount&3;
2761                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2762                 ADJUST_ARGS();
2763         }
2764         return 0;
2765 }
2766
2767 static __be32
2768 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2769 {
2770         int maxcount;
2771         loff_t offset;
2772         __be32 *page, *savep, *tailbase;
2773         __be32 *p;
2774
2775         if (nfserr)
2776                 return nfserr;
2777         if (resp->xbuf->page_len)
2778                 return nfserr_resource;
2779
2780         RESERVE_SPACE(8);  /* verifier */
2781         savep = p;
2782
2783         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2784         WRITE32(0);
2785         WRITE32(0);
2786         ADJUST_ARGS();
2787         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2788         tailbase = p;
2789
2790         maxcount = PAGE_SIZE;
2791         if (maxcount > readdir->rd_maxcount)
2792                 maxcount = readdir->rd_maxcount;
2793
2794         /*
2795          * Convert from bytes to words, account for the two words already
2796          * written, make sure to leave two words at the end for the next
2797          * pointer and eof field.
2798          */
2799         maxcount = (maxcount >> 2) - 4;
2800         if (maxcount < 0) {
2801                 nfserr =  nfserr_toosmall;
2802                 goto err_no_verf;
2803         }
2804
2805         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2806         readdir->common.err = 0;
2807         readdir->buflen = maxcount;
2808         readdir->buffer = page;
2809         readdir->offset = NULL;
2810
2811         offset = readdir->rd_cookie;
2812         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2813                               &offset,
2814                               &readdir->common, nfsd4_encode_dirent);
2815         if (nfserr == nfs_ok &&
2816             readdir->common.err == nfserr_toosmall &&
2817             readdir->buffer == page)
2818                 nfserr = nfserr_toosmall;
2819         if (nfserr == nfserr_symlink)
2820                 nfserr = nfserr_notdir;
2821         if (nfserr)
2822                 goto err_no_verf;
2823
2824         if (readdir->offset)
2825                 xdr_encode_hyper(readdir->offset, offset);
2826
2827         p = readdir->buffer;
2828         *p++ = 0;       /* no more entries */
2829         *p++ = htonl(readdir->common.err == nfserr_eof);
2830         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2831                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2832
2833         /* Use rest of head for padding and remaining ops: */
2834         resp->xbuf->tail[0].iov_base = tailbase;
2835         resp->xbuf->tail[0].iov_len = 0;
2836         resp->p = resp->xbuf->tail[0].iov_base;
2837         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2838
2839         return 0;
2840 err_no_verf:
2841         p = savep;
2842         ADJUST_ARGS();
2843         return nfserr;
2844 }
2845
2846 static __be32
2847 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2848 {
2849         __be32 *p;
2850
2851         if (!nfserr) {
2852                 RESERVE_SPACE(20);
2853                 write_cinfo(&p, &remove->rm_cinfo);
2854                 ADJUST_ARGS();
2855         }
2856         return nfserr;
2857 }
2858
2859 static __be32
2860 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2861 {
2862         __be32 *p;
2863
2864         if (!nfserr) {
2865                 RESERVE_SPACE(40);
2866                 write_cinfo(&p, &rename->rn_sinfo);
2867                 write_cinfo(&p, &rename->rn_tinfo);
2868                 ADJUST_ARGS();
2869         }
2870         return nfserr;
2871 }
2872
2873 static __be32
2874 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
2875                          __be32 nfserr,struct svc_export *exp)
2876 {
2877         int i = 0;
2878         u32 nflavs;
2879         struct exp_flavor_info *flavs;
2880         struct exp_flavor_info def_flavs[2];
2881         __be32 *p;
2882
2883         if (nfserr)
2884                 goto out;
2885         if (exp->ex_nflavors) {
2886                 flavs = exp->ex_flavors;
2887                 nflavs = exp->ex_nflavors;
2888         } else { /* Handling of some defaults in absence of real secinfo: */
2889                 flavs = def_flavs;
2890                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2891                         nflavs = 2;
2892                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2893                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2894                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2895                         nflavs = 1;
2896                         flavs[0].pseudoflavor
2897                                         = svcauth_gss_flavor(exp->ex_client);
2898                 } else {
2899                         nflavs = 1;
2900                         flavs[0].pseudoflavor
2901                                         = exp->ex_client->flavour->flavour;
2902                 }
2903         }
2904
2905         RESERVE_SPACE(4);
2906         WRITE32(nflavs);
2907         ADJUST_ARGS();
2908         for (i = 0; i < nflavs; i++) {
2909                 u32 flav = flavs[i].pseudoflavor;
2910                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2911
2912                 if (gm) {
2913                         RESERVE_SPACE(4);
2914                         WRITE32(RPC_AUTH_GSS);
2915                         ADJUST_ARGS();
2916                         RESERVE_SPACE(4 + gm->gm_oid.len);
2917                         WRITE32(gm->gm_oid.len);
2918                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2919                         ADJUST_ARGS();
2920                         RESERVE_SPACE(4);
2921                         WRITE32(0); /* qop */
2922                         ADJUST_ARGS();
2923                         RESERVE_SPACE(4);
2924                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2925                         ADJUST_ARGS();
2926                         gss_mech_put(gm);
2927                 } else {
2928                         RESERVE_SPACE(4);
2929                         WRITE32(flav);
2930                         ADJUST_ARGS();
2931                 }
2932         }
2933 out:
2934         if (exp)
2935                 exp_put(exp);
2936         return nfserr;
2937 }
2938
2939 static __be32
2940 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2941                      struct nfsd4_secinfo *secinfo)
2942 {
2943         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
2944 }
2945
2946 static __be32
2947 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
2948                      struct nfsd4_secinfo_no_name *secinfo)
2949 {
2950         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
2951 }
2952
2953 /*
2954  * The SETATTR encode routine is special -- it always encodes a bitmap,
2955  * regardless of the error status.
2956  */
2957 static __be32
2958 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2959 {
2960         __be32 *p;
2961
2962         RESERVE_SPACE(12);
2963         if (nfserr) {
2964                 WRITE32(2);
2965                 WRITE32(0);
2966                 WRITE32(0);
2967         }
2968         else {
2969                 WRITE32(2);
2970                 WRITE32(setattr->sa_bmval[0]);
2971                 WRITE32(setattr->sa_bmval[1]);
2972         }
2973         ADJUST_ARGS();
2974         return nfserr;
2975 }
2976
2977 static __be32
2978 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2979 {
2980         __be32 *p;
2981
2982         if (!nfserr) {
2983                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2984                 WRITEMEM(&scd->se_clientid, 8);
2985                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2986                 ADJUST_ARGS();
2987         }
2988         else if (nfserr == nfserr_clid_inuse) {
2989                 RESERVE_SPACE(8);
2990                 WRITE32(0);
2991                 WRITE32(0);
2992                 ADJUST_ARGS();
2993         }
2994         return nfserr;
2995 }
2996
2997 static __be32
2998 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2999 {
3000         __be32 *p;
3001
3002         if (!nfserr) {
3003                 RESERVE_SPACE(16);
3004                 WRITE32(write->wr_bytes_written);
3005                 WRITE32(write->wr_how_written);
3006                 WRITEMEM(write->wr_verifier.data, 8);
3007                 ADJUST_ARGS();
3008         }
3009         return nfserr;
3010 }
3011
3012 static __be32
3013 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
3014                          struct nfsd4_exchange_id *exid)
3015 {
3016         __be32 *p;
3017         char *major_id;
3018         char *server_scope;
3019         int major_id_sz;
3020         int server_scope_sz;
3021         uint64_t minor_id = 0;
3022
3023         if (nfserr)
3024                 return nfserr;
3025
3026         major_id = utsname()->nodename;
3027         major_id_sz = strlen(major_id);
3028         server_scope = utsname()->nodename;
3029         server_scope_sz = strlen(server_scope);
3030
3031         RESERVE_SPACE(
3032                 8 /* eir_clientid */ +
3033                 4 /* eir_sequenceid */ +
3034                 4 /* eir_flags */ +
3035                 4 /* spr_how (SP4_NONE) */ +
3036                 8 /* so_minor_id */ +
3037                 4 /* so_major_id.len */ +
3038                 (XDR_QUADLEN(major_id_sz) * 4) +
3039                 4 /* eir_server_scope.len */ +
3040                 (XDR_QUADLEN(server_scope_sz) * 4) +
3041                 4 /* eir_server_impl_id.count (0) */);
3042
3043         WRITEMEM(&exid->clientid, 8);
3044         WRITE32(exid->seqid);
3045         WRITE32(exid->flags);
3046
3047         /* state_protect4_r. Currently only support SP4_NONE */
3048         BUG_ON(exid->spa_how != SP4_NONE);
3049         WRITE32(exid->spa_how);
3050
3051         /* The server_owner struct */
3052         WRITE64(minor_id);      /* Minor id */
3053         /* major id */
3054         WRITE32(major_id_sz);
3055         WRITEMEM(major_id, major_id_sz);
3056
3057         /* Server scope */
3058         WRITE32(server_scope_sz);
3059         WRITEMEM(server_scope, server_scope_sz);
3060
3061         /* Implementation id */
3062         WRITE32(0);     /* zero length nfs_impl_id4 array */
3063         ADJUST_ARGS();
3064         return 0;
3065 }
3066
3067 static __be32
3068 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3069                             struct nfsd4_create_session *sess)
3070 {
3071         __be32 *p;
3072
3073         if (nfserr)
3074                 return nfserr;
3075
3076         RESERVE_SPACE(24);
3077         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3078         WRITE32(sess->seqid);
3079         WRITE32(sess->flags);
3080         ADJUST_ARGS();
3081
3082         RESERVE_SPACE(28);
3083         WRITE32(0); /* headerpadsz */
3084         WRITE32(sess->fore_channel.maxreq_sz);
3085         WRITE32(sess->fore_channel.maxresp_sz);
3086         WRITE32(sess->fore_channel.maxresp_cached);
3087         WRITE32(sess->fore_channel.maxops);
3088         WRITE32(sess->fore_channel.maxreqs);
3089         WRITE32(sess->fore_channel.nr_rdma_attrs);
3090         ADJUST_ARGS();
3091
3092         if (sess->fore_channel.nr_rdma_attrs) {
3093                 RESERVE_SPACE(4);
3094                 WRITE32(sess->fore_channel.rdma_attrs);
3095                 ADJUST_ARGS();
3096         }
3097
3098         RESERVE_SPACE(28);
3099         WRITE32(0); /* headerpadsz */
3100         WRITE32(sess->back_channel.maxreq_sz);
3101         WRITE32(sess->back_channel.maxresp_sz);
3102         WRITE32(sess->back_channel.maxresp_cached);
3103         WRITE32(sess->back_channel.maxops);
3104         WRITE32(sess->back_channel.maxreqs);
3105         WRITE32(sess->back_channel.nr_rdma_attrs);
3106         ADJUST_ARGS();
3107
3108         if (sess->back_channel.nr_rdma_attrs) {
3109                 RESERVE_SPACE(4);
3110                 WRITE32(sess->back_channel.rdma_attrs);
3111                 ADJUST_ARGS();
3112         }
3113         return 0;
3114 }
3115
3116 static __be32
3117 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3118                              struct nfsd4_destroy_session *destroy_session)
3119 {
3120         return nfserr;
3121 }
3122
3123 __be32
3124 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3125                       struct nfsd4_sequence *seq)
3126 {
3127         __be32 *p;
3128
3129         if (nfserr)
3130                 return nfserr;
3131
3132         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3133         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3134         WRITE32(seq->seqid);
3135         WRITE32(seq->slotid);
3136         WRITE32(seq->maxslots);
3137         /* For now: target_maxslots = maxslots */
3138         WRITE32(seq->maxslots);
3139         WRITE32(seq->status_flags);
3140
3141         ADJUST_ARGS();
3142         resp->cstate.datap = p; /* DRC cache data pointer */
3143         return 0;
3144 }
3145
3146 static __be32
3147 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3148 {
3149         return nfserr;
3150 }
3151
3152 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3153
3154 /*
3155  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3156  * since we don't need to filter out obsolete ops as this is
3157  * done in the decoding phase.
3158  */
3159 static nfsd4_enc nfsd4_enc_ops[] = {
3160         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3161         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3162         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3163         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3164         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3165         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3166         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3167         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3168         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3169         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3170         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3171         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3172         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3173         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3174         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3175         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3176         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3177         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3178         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3179         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3180         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3181         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3182         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3183         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3184         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3185         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3186         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3187         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3188         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3189         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3190         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3191         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3192         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3193         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3194         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3195         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3196         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3197
3198         /* NFSv4.1 operations */
3199         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3200         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3201         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3202         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3203         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3204         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3205         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3206         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3207         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3208         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3209         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3210         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3211         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3212         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3213         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3214         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3215         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3216         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3217         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3218 };
3219
3220 /*
3221  * Calculate the total amount of memory that the compound response has taken
3222  * after encoding the current operation.
3223  *
3224  * pad: add on 8 bytes for the next operation's op_code and status so that
3225  * there is room to cache a failure on the next operation.
3226  *
3227  * Compare this length to the session se_fmaxresp_cached.
3228  *
3229  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3230  * will be at least a page and will therefore hold the xdr_buf head.
3231  */
3232 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3233 {
3234         int status = 0;
3235         struct xdr_buf *xb = &resp->rqstp->rq_res;
3236         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3237         struct nfsd4_session *session = NULL;
3238         struct nfsd4_slot *slot = resp->cstate.slot;
3239         u32 length, tlen = 0, pad = 8;
3240
3241         if (!nfsd4_has_session(&resp->cstate))
3242                 return status;
3243
3244         session = resp->cstate.session;
3245         if (session == NULL || slot->sl_cachethis == 0)
3246                 return status;
3247
3248         if (resp->opcnt >= args->opcnt)
3249                 pad = 0; /* this is the last operation */
3250
3251         if (xb->page_len == 0) {
3252                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3253         } else {
3254                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3255                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3256
3257                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3258         }
3259         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3260                 length, xb->page_len, tlen, pad);
3261
3262         if (length <= session->se_fchannel.maxresp_cached)
3263                 return status;
3264         else
3265                 return nfserr_rep_too_big_to_cache;
3266 }
3267
3268 void
3269 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3270 {
3271         __be32 *statp;
3272         __be32 *p;
3273
3274         RESERVE_SPACE(8);
3275         WRITE32(op->opnum);
3276         statp = p++;    /* to be backfilled at the end */
3277         ADJUST_ARGS();
3278
3279         if (op->opnum == OP_ILLEGAL)
3280                 goto status;
3281         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3282                !nfsd4_enc_ops[op->opnum]);
3283         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3284         /* nfsd4_check_drc_limit guarantees enough room for error status */
3285         if (!op->status && nfsd4_check_drc_limit(resp))
3286                 op->status = nfserr_rep_too_big_to_cache;
3287 status:
3288         /*
3289          * Note: We write the status directly, instead of using WRITE32(),
3290          * since it is already in network byte order.
3291          */
3292         *statp = op->status;
3293 }
3294
3295 /*
3296  * Encode the reply stored in the stateowner reply cache
3297  *
3298  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3299  * previously sent already encoded operation.
3300  *
3301  * called with nfs4_lock_state() held
3302  */
3303 void
3304 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3305 {
3306         __be32 *p;
3307         struct nfs4_replay *rp = op->replay;
3308
3309         BUG_ON(!rp);
3310
3311         RESERVE_SPACE(8);
3312         WRITE32(op->opnum);
3313         *p++ = rp->rp_status;  /* already xdr'ed */
3314         ADJUST_ARGS();
3315
3316         RESERVE_SPACE(rp->rp_buflen);
3317         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3318         ADJUST_ARGS();
3319 }
3320
3321 int
3322 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3323 {
3324         return xdr_ressize_check(rqstp, p);
3325 }
3326
3327 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3328 {
3329         if (args->ops != args->iops) {
3330                 kfree(args->ops);
3331                 args->ops = args->iops;
3332         }
3333         kfree(args->tmpp);
3334         args->tmpp = NULL;
3335         while (args->to_free) {
3336                 struct tmpbuf *tb = args->to_free;
3337                 args->to_free = tb->next;
3338                 tb->release(tb->buf);
3339                 kfree(tb);
3340         }
3341 }
3342
3343 int
3344 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3345 {
3346         __be32 status;
3347
3348         args->p = p;
3349         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3350         args->pagelist = rqstp->rq_arg.pages;
3351         args->pagelen = rqstp->rq_arg.page_len;
3352         args->tmpp = NULL;
3353         args->to_free = NULL;
3354         args->ops = args->iops;
3355         args->rqstp = rqstp;
3356
3357         status = nfsd4_decode_compound(args);
3358         if (status) {
3359                 nfsd4_release_compoundargs(args);
3360         }
3361         return !status;
3362 }
3363
3364 int
3365 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3366 {
3367         /*
3368          * All that remains is to write the tag and operation count...
3369          */
3370         struct nfsd4_compound_state *cs = &resp->cstate;
3371         struct kvec *iov;
3372         p = resp->tagp;
3373         *p++ = htonl(resp->taglen);
3374         memcpy(p, resp->tag, resp->taglen);
3375         p += XDR_QUADLEN(resp->taglen);
3376         *p++ = htonl(resp->opcnt);
3377
3378         if (rqstp->rq_res.page_len)
3379                 iov = &rqstp->rq_res.tail[0];
3380         else
3381                 iov = &rqstp->rq_res.head[0];
3382         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3383         BUG_ON(iov->iov_len > PAGE_SIZE);
3384         if (nfsd4_has_session(cs)) {
3385                 if (cs->status != nfserr_replay_cache) {
3386                         nfsd4_store_cache_entry(resp);
3387                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3388                         cs->slot->sl_inuse = false;
3389                 }
3390                 /* Renew the clientid on success and on replay */
3391                 release_session_client(cs->session);
3392                 nfsd4_put_session(cs->session);
3393         }
3394         return 1;
3395 }
3396
3397 /*
3398  * Local variables:
3399  *  c-basic-offset: 8
3400  * End:
3401  */