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/pagemap.h>
  48 #include <linux/sunrpc/svcauth_gss.h>
  49
  50 #include "idmap.h"
  51 #include "acl.h"
  52 #include "xdr4.h"
  53 #include "vfs.h"
  54 #include "state.h"
  55 #include "cache.h"
  56 #include "netns.h"
  57
  58 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  59
  60 /*
  61  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  62  * directory in order to indicate to the client that a filesystem boundary is present
  63  * We use a fixed fsid for a referral
  64  */
  65 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  66 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  67
  68 static __be32
  69 check_filename(char *str, int len)
  70 {
  71         int i;
  72
  73         if (len == 0)
  74                 return nfserr_inval;
  75         if (isdotent(str, len))
  76                 return nfserr_badname;
  77         for (i = 0; i < len; i++)
  78                 if (str[i] == '/')
  79                         return nfserr_badname;
  80         return 0;
  81 }
  82
  83 #define DECODE_HEAD                             \
  84         __be32 *p;                              \
  85         __be32 status
  86 #define DECODE_TAIL                             \
  87         status = 0;                             \
  88 out:                                            \
  89         return status;                          \
  90 xdr_error:                                      \
  91         dprintk("NFSD: xdr error (%s:%d)\n",    \
  92                         __FILE__, __LINE__);    \
  93         status = nfserr_bad_xdr;                \
  94         goto out
  95
  96 #define READ32(x)         (x) = ntohl(*p++)
  97 #define READ64(x)         do {                  \
  98         (x) = (u64)ntohl(*p++) << 32;           \
  99         (x) |= ntohl(*p++);                     \
 100 } while (0)
 101 #define READTIME(x)       do {                  \
 102         p++;                                    \
 103         (x) = ntohl(*p++);                      \
 104         p++;                                    \
 105 } while (0)
 106 #define READMEM(x,nbytes) do {                  \
 107         x = (char *)p;                          \
 108         p += XDR_QUADLEN(nbytes);               \
 109 } while (0)
 110 #define SAVEMEM(x,nbytes) do {                  \
 111         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 112                 savemem(argp, p, nbytes) :      \
 113                 (char *)p)) {                   \
 114                 dprintk("NFSD: xdr error (%s:%d)\n", \
 115                                 __FILE__, __LINE__); \
 116                 goto xdr_error;                 \
 117                 }                               \
 118         p += XDR_QUADLEN(nbytes);               \
 119 } while (0)
 120 #define COPYMEM(x,nbytes) do {                  \
 121         memcpy((x), p, nbytes);                 \
 122         p += XDR_QUADLEN(nbytes);               \
 123 } while (0)
 124
 125 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 126 #define READ_BUF(nbytes)  do {                  \
 127         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 128                 p = argp->p;                    \
 129                 argp->p += XDR_QUADLEN(nbytes); \
 130         } else if (!(p = read_buf(argp, nbytes))) { \
 131                 dprintk("NFSD: xdr error (%s:%d)\n", \
 132                                 __FILE__, __LINE__); \
 133                 goto xdr_error;                 \
 134         }                                       \
 135 } while (0)
 136
 137 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 138 {
 139         /* We want more bytes than seem to be available.
 140          * Maybe we need a new page, maybe we have just run out
 141          */
 142         unsigned int avail = (char *)argp->end - (char *)argp->p;
 143         __be32 *p;
 144         if (avail + argp->pagelen < nbytes)
 145                 return NULL;
 146         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 147                 return NULL;
 148         /* ok, we can do it with the current plus the next page */
 149         if (nbytes <= sizeof(argp->tmp))
 150                 p = argp->tmp;
 151         else {
 152                 kfree(argp->tmpp);
 153                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 154                 if (!p)
 155                         return NULL;
 156
 157         }
 158         /*
 159          * The following memcpy is safe because read_buf is always
 160          * called with nbytes > avail, and the two cases above both
 161          * guarantee p points to at least nbytes bytes.
 162          */
 163         memcpy(p, argp->p, avail);
 164         /* step to next page */
 165         argp->p = page_address(argp->pagelist[0]);
 166         argp->pagelist++;
 167         if (argp->pagelen < PAGE_SIZE) {
 168                 argp->end = argp->p + (argp->pagelen>>2);
 169                 argp->pagelen = 0;
 170         } else {
 171                 argp->end = argp->p + (PAGE_SIZE>>2);
 172                 argp->pagelen -= PAGE_SIZE;
 173         }
 174         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 175         argp->p += XDR_QUADLEN(nbytes - avail);
 176         return p;
 177 }
 178
 179 static int zero_clientid(clientid_t *clid)
 180 {
 181         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 182 }
 183
 184 static int
 185 defer_free(struct nfsd4_compoundargs *argp,
 186                 void (*release)(const void *), void *p)
 187 {
 188         struct tmpbuf *tb;
 189
 190         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 191         if (!tb)
 192                 return -ENOMEM;
 193         tb->buf = p;
 194         tb->release = release;
 195         tb->next = argp->to_free;
 196         argp->to_free = tb;
 197         return 0;
 198 }
 199
 200 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 201 {
 202         if (p == argp->tmp) {
 203                 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
 204                 if (!p)
 205                         return NULL;
 206         } else {
 207                 BUG_ON(p != argp->tmpp);
 208                 argp->tmpp = NULL;
 209         }
 210         if (defer_free(argp, kfree, p)) {
 211                 kfree(p);
 212                 return NULL;
 213         } else
 214                 return (char *)p;
 215 }
 216
 217 static __be32
 218 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 219 {
 220         u32 bmlen;
 221         DECODE_HEAD;
 222
 223         bmval[0] = 0;
 224         bmval[1] = 0;
 225         bmval[2] = 0;
 226
 227         READ_BUF(4);
 228         READ32(bmlen);
 229         if (bmlen > 1000)
 230                 goto xdr_error;
 231
 232         READ_BUF(bmlen << 2);
 233         if (bmlen > 0)
 234                 READ32(bmval[0]);
 235         if (bmlen > 1)
 236                 READ32(bmval[1]);
 237         if (bmlen > 2)
 238                 READ32(bmval[2]);
 239
 240         DECODE_TAIL;
 241 }
 242
 243 static __be32
 244 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 245                    struct iattr *iattr, struct nfs4_acl **acl)
 246 {
 247         int expected_len, len = 0;
 248         u32 dummy32;
 249         char *buf;
 250         int host_err;
 251
 252         DECODE_HEAD;
 253         iattr->ia_valid = 0;
 254         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 255                 return status;
 256
 257         READ_BUF(4);
 258         READ32(expected_len);
 259
 260         if (bmval[0] & FATTR4_WORD0_SIZE) {
 261                 READ_BUF(8);
 262                 len += 8;
 263                 READ64(iattr->ia_size);
 264                 iattr->ia_valid |= ATTR_SIZE;
 265         }
 266         if (bmval[0] & FATTR4_WORD0_ACL) {
 267                 int nace;
 268                 struct nfs4_ace *ace;
 269
 270                 READ_BUF(4); len += 4;
 271                 READ32(nace);
 272
 273                 if (nace > NFS4_ACL_MAX)
 274                         return nfserr_resource;
 275
 276                 *acl = nfs4_acl_new(nace);
 277                 if (*acl == NULL) {
 278                         host_err = -ENOMEM;
 279                         goto out_nfserr;
 280                 }
 281                 defer_free(argp, kfree, *acl);
 282
 283                 (*acl)->naces = nace;
 284                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 285                         READ_BUF(16); len += 16;
 286                         READ32(ace->type);
 287                         READ32(ace->flag);
 288                         READ32(ace->access_mask);
 289                         READ32(dummy32);
 290                         READ_BUF(dummy32);
 291                         len += XDR_QUADLEN(dummy32) << 2;
 292                         READMEM(buf, dummy32);
 293                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 294                         status = nfs_ok;
 295                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 296                                 ace->who = 0;
 297                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 298                                 status = nfsd_map_name_to_gid(argp->rqstp,
 299                                                 buf, dummy32, &ace->who);
 300                         else
 301                                 status = nfsd_map_name_to_uid(argp->rqstp,
 302                                                 buf, dummy32, &ace->who);
 303                         if (status)
 304                                 return status;
 305                 }
 306         } else
 307                 *acl = NULL;
 308         if (bmval[1] & FATTR4_WORD1_MODE) {
 309                 READ_BUF(4);
 310                 len += 4;
 311                 READ32(iattr->ia_mode);
 312                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 313                 iattr->ia_valid |= ATTR_MODE;
 314         }
 315         if (bmval[1] & FATTR4_WORD1_OWNER) {
 316                 READ_BUF(4);
 317                 len += 4;
 318                 READ32(dummy32);
 319                 READ_BUF(dummy32);
 320                 len += (XDR_QUADLEN(dummy32) << 2);
 321                 READMEM(buf, dummy32);
 322                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 323                         return status;
 324                 iattr->ia_valid |= ATTR_UID;
 325         }
 326         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 327                 READ_BUF(4);
 328                 len += 4;
 329                 READ32(dummy32);
 330                 READ_BUF(dummy32);
 331                 len += (XDR_QUADLEN(dummy32) << 2);
 332                 READMEM(buf, dummy32);
 333                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 334                         return status;
 335                 iattr->ia_valid |= ATTR_GID;
 336         }
 337         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 338                 READ_BUF(4);
 339                 len += 4;
 340                 READ32(dummy32);
 341                 switch (dummy32) {
 342                 case NFS4_SET_TO_CLIENT_TIME:
 343                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 344                            all 32 bits of 'nseconds'. */
 345                         READ_BUF(12);
 346                         len += 12;
 347                         READ32(dummy32);
 348                         if (dummy32)
 349                                 return nfserr_inval;
 350                         READ32(iattr->ia_atime.tv_sec);
 351                         READ32(iattr->ia_atime.tv_nsec);
 352                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 353                                 return nfserr_inval;
 354                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 355                         break;
 356                 case NFS4_SET_TO_SERVER_TIME:
 357                         iattr->ia_valid |= ATTR_ATIME;
 358                         break;
 359                 default:
 360                         goto xdr_error;
 361                 }
 362         }
 363         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 364                 READ_BUF(4);
 365                 len += 4;
 366                 READ32(dummy32);
 367                 switch (dummy32) {
 368                 case NFS4_SET_TO_CLIENT_TIME:
 369                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 370                            all 32 bits of 'nseconds'. */
 371                         READ_BUF(12);
 372                         len += 12;
 373                         READ32(dummy32);
 374                         if (dummy32)
 375                                 return nfserr_inval;
 376                         READ32(iattr->ia_mtime.tv_sec);
 377                         READ32(iattr->ia_mtime.tv_nsec);
 378                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 379                                 return nfserr_inval;
 380                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 381                         break;
 382                 case NFS4_SET_TO_SERVER_TIME:
 383                         iattr->ia_valid |= ATTR_MTIME;
 384                         break;
 385                 default:
 386                         goto xdr_error;
 387                 }
 388         }
 389         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 390             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 391             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 392                 READ_BUF(expected_len - len);
 393         else if (len != expected_len)
 394                 goto xdr_error;
 395
 396         DECODE_TAIL;
 397
 398 out_nfserr:
 399         status = nfserrno(host_err);
 400         goto out;
 401 }
 402
 403 static __be32
 404 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 405 {
 406         DECODE_HEAD;
 407
 408         READ_BUF(sizeof(stateid_t));
 409         READ32(sid->si_generation);
 410         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 411
 412         DECODE_TAIL;
 413 }
 414
 415 static __be32
 416 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 417 {
 418         DECODE_HEAD;
 419
 420         READ_BUF(4);
 421         READ32(access->ac_req_access);
 422
 423         DECODE_TAIL;
 424 }
 425
 426 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 427 {
 428         DECODE_HEAD;
 429         u32 dummy, uid, gid;
 430         char *machine_name;
 431         int i;
 432         int nr_secflavs;
 433
 434         /* callback_sec_params4 */
 435         READ_BUF(4);
 436         READ32(nr_secflavs);
 437         cbs->flavor = (u32)(-1);
 438         for (i = 0; i < nr_secflavs; ++i) {
 439                 READ_BUF(4);
 440                 READ32(dummy);
 441                 switch (dummy) {
 442                 case RPC_AUTH_NULL:
 443                         /* Nothing to read */
 444                         if (cbs->flavor == (u32)(-1))
 445                                 cbs->flavor = RPC_AUTH_NULL;
 446                         break;
 447                 case RPC_AUTH_UNIX:
 448                         READ_BUF(8);
 449                         /* stamp */
 450                         READ32(dummy);
 451
 452                         /* machine name */
 453                         READ32(dummy);
 454                         READ_BUF(dummy);
 455                         SAVEMEM(machine_name, dummy);
 456
 457                         /* uid, gid */
 458                         READ_BUF(8);
 459                         READ32(uid);
 460                         READ32(gid);
 461
 462                         /* more gids */
 463                         READ_BUF(4);
 464                         READ32(dummy);
 465                         READ_BUF(dummy * 4);
 466                         if (cbs->flavor == (u32)(-1)) {
 467                                 cbs->uid = uid;
 468                                 cbs->gid = gid;
 469                                 cbs->flavor = RPC_AUTH_UNIX;
 470                         }
 471                         break;
 472                 case RPC_AUTH_GSS:
 473                         dprintk("RPC_AUTH_GSS callback secflavor "
 474                                 "not supported!\n");
 475                         READ_BUF(8);
 476                         /* gcbp_service */
 477                         READ32(dummy);
 478                         /* gcbp_handle_from_server */
 479                         READ32(dummy);
 480                         READ_BUF(dummy);
 481                         p += XDR_QUADLEN(dummy);
 482                         /* gcbp_handle_from_client */
 483                         READ_BUF(4);
 484                         READ32(dummy);
 485                         READ_BUF(dummy);
 486                         break;
 487                 default:
 488                         dprintk("Illegal callback secflavor\n");
 489                         return nfserr_inval;
 490                 }
 491         }
 492         DECODE_TAIL;
 493 }
 494
 495 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 496 {
 497         DECODE_HEAD;
 498
 499         READ_BUF(4);
 500         READ32(bc->bc_cb_program);
 501         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 502
 503         DECODE_TAIL;
 504 }
 505
 506 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 507 {
 508         DECODE_HEAD;
 509
 510         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 511         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 512         READ32(bcts->dir);
 513         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 514          * could help us figure out we should be using it. */
 515         DECODE_TAIL;
 516 }
 517
 518 static __be32
 519 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 520 {
 521         DECODE_HEAD;
 522
 523         READ_BUF(4);
 524         READ32(close->cl_seqid);
 525         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 526
 527         DECODE_TAIL;
 528 }
 529
 530
 531 static __be32
 532 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 533 {
 534         DECODE_HEAD;
 535
 536         READ_BUF(12);
 537         READ64(commit->co_offset);
 538         READ32(commit->co_count);
 539
 540         DECODE_TAIL;
 541 }
 542
 543 static __be32
 544 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 545 {
 546         DECODE_HEAD;
 547
 548         READ_BUF(4);
 549         READ32(create->cr_type);
 550         switch (create->cr_type) {
 551         case NF4LNK:
 552                 READ_BUF(4);
 553                 READ32(create->cr_linklen);
 554                 READ_BUF(create->cr_linklen);
 555                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 556                 break;
 557         case NF4BLK:
 558         case NF4CHR:
 559                 READ_BUF(8);
 560                 READ32(create->cr_specdata1);
 561                 READ32(create->cr_specdata2);
 562                 break;
 563         case NF4SOCK:
 564         case NF4FIFO:
 565         case NF4DIR:
 566         default:
 567                 break;
 568         }
 569
 570         READ_BUF(4);
 571         READ32(create->cr_namelen);
 572         READ_BUF(create->cr_namelen);
 573         SAVEMEM(create->cr_name, create->cr_namelen);
 574         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 575                 return status;
 576
 577         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 578                                     &create->cr_acl);
 579         if (status)
 580                 goto out;
 581
 582         DECODE_TAIL;
 583 }
 584
 585 static inline __be32
 586 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 587 {
 588         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 589 }
 590
 591 static inline __be32
 592 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 593 {
 594         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 595 }
 596
 597 static __be32
 598 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 599 {
 600         DECODE_HEAD;
 601
 602         READ_BUF(4);
 603         READ32(link->li_namelen);
 604         READ_BUF(link->li_namelen);
 605         SAVEMEM(link->li_name, link->li_namelen);
 606         if ((status = check_filename(link->li_name, link->li_namelen)))
 607                 return status;
 608
 609         DECODE_TAIL;
 610 }
 611
 612 static __be32
 613 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 614 {
 615         DECODE_HEAD;
 616
 617         /*
 618         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 619         */
 620         READ_BUF(28);
 621         READ32(lock->lk_type);
 622         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 623                 goto xdr_error;
 624         READ32(lock->lk_reclaim);
 625         READ64(lock->lk_offset);
 626         READ64(lock->lk_length);
 627         READ32(lock->lk_is_new);
 628
 629         if (lock->lk_is_new) {
 630                 READ_BUF(4);
 631                 READ32(lock->lk_new_open_seqid);
 632                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 633                 if (status)
 634                         return status;
 635                 READ_BUF(8 + sizeof(clientid_t));
 636                 READ32(lock->lk_new_lock_seqid);
 637                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 638                 READ32(lock->lk_new_owner.len);
 639                 READ_BUF(lock->lk_new_owner.len);
 640                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 641         } else {
 642                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 643                 if (status)
 644                         return status;
 645                 READ_BUF(4);
 646                 READ32(lock->lk_old_lock_seqid);
 647         }
 648
 649         DECODE_TAIL;
 650 }
 651
 652 static __be32
 653 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 654 {
 655         DECODE_HEAD;
 656
 657         READ_BUF(32);
 658         READ32(lockt->lt_type);
 659         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 660                 goto xdr_error;
 661         READ64(lockt->lt_offset);
 662         READ64(lockt->lt_length);
 663         COPYMEM(&lockt->lt_clientid, 8);
 664         READ32(lockt->lt_owner.len);
 665         READ_BUF(lockt->lt_owner.len);
 666         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 667
 668         DECODE_TAIL;
 669 }
 670
 671 static __be32
 672 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 673 {
 674         DECODE_HEAD;
 675
 676         READ_BUF(8);
 677         READ32(locku->lu_type);
 678         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 679                 goto xdr_error;
 680         READ32(locku->lu_seqid);
 681         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 682         if (status)
 683                 return status;
 684         READ_BUF(16);
 685         READ64(locku->lu_offset);
 686         READ64(locku->lu_length);
 687
 688         DECODE_TAIL;
 689 }
 690
 691 static __be32
 692 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 693 {
 694         DECODE_HEAD;
 695
 696         READ_BUF(4);
 697         READ32(lookup->lo_len);
 698         READ_BUF(lookup->lo_len);
 699         SAVEMEM(lookup->lo_name, lookup->lo_len);
 700         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 701                 return status;
 702
 703         DECODE_TAIL;
 704 }
 705
 706 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 707 {
 708         __be32 *p;
 709         u32 w;
 710
 711         READ_BUF(4);
 712         READ32(w);
 713         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 714         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 715         if (deleg_when)
 716                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 717
 718         switch (w & NFS4_SHARE_ACCESS_MASK) {
 719         case NFS4_SHARE_ACCESS_READ:
 720         case NFS4_SHARE_ACCESS_WRITE:
 721         case NFS4_SHARE_ACCESS_BOTH:
 722                 break;
 723         default:
 724                 return nfserr_bad_xdr;
 725         }
 726         w &= ~NFS4_SHARE_ACCESS_MASK;
 727         if (!w)
 728                 return nfs_ok;
 729         if (!argp->minorversion)
 730                 return nfserr_bad_xdr;
 731         switch (w & NFS4_SHARE_WANT_MASK) {
 732         case NFS4_SHARE_WANT_NO_PREFERENCE:
 733         case NFS4_SHARE_WANT_READ_DELEG:
 734         case NFS4_SHARE_WANT_WRITE_DELEG:
 735         case NFS4_SHARE_WANT_ANY_DELEG:
 736         case NFS4_SHARE_WANT_NO_DELEG:
 737         case NFS4_SHARE_WANT_CANCEL:
 738                 break;
 739         default:
 740                 return nfserr_bad_xdr;
 741         }
 742         w &= ~NFS4_SHARE_WANT_MASK;
 743         if (!w)
 744                 return nfs_ok;
 745
 746         if (!deleg_when)        /* open_downgrade */
 747                 return nfserr_inval;
 748         switch (w) {
 749         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 750         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 751         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 752               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 753                 return nfs_ok;
 754         }
 755 xdr_error:
 756         return nfserr_bad_xdr;
 757 }
 758
 759 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 760 {
 761         __be32 *p;
 762
 763         READ_BUF(4);
 764         READ32(*x);
 765         /* Note: unlinke access bits, deny bits may be zero. */
 766         if (*x & ~NFS4_SHARE_DENY_BOTH)
 767                 return nfserr_bad_xdr;
 768         return nfs_ok;
 769 xdr_error:
 770         return nfserr_bad_xdr;
 771 }
 772
 773 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 774 {
 775         __be32 *p;
 776
 777         READ_BUF(4);
 778         READ32(o->len);
 779
 780         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 781                 return nfserr_bad_xdr;
 782
 783         READ_BUF(o->len);
 784         SAVEMEM(o->data, o->len);
 785         return nfs_ok;
 786 xdr_error:
 787         return nfserr_bad_xdr;
 788 }
 789
 790 static __be32
 791 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 792 {
 793         DECODE_HEAD;
 794         u32 dummy;
 795
 796         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 797         open->op_iattr.ia_valid = 0;
 798         open->op_openowner = NULL;
 799
 800         /* seqid, share_access, share_deny, clientid, ownerlen */
 801         READ_BUF(4);
 802         READ32(open->op_seqid);
 803         /* decode, yet ignore deleg_when until supported */
 804         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 805                                            &open->op_deleg_want, &dummy);
 806         if (status)
 807                 goto xdr_error;
 808         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 809         if (status)
 810                 goto xdr_error;
 811         READ_BUF(sizeof(clientid_t));
 812         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 813         status = nfsd4_decode_opaque(argp, &open->op_owner);
 814         if (status)
 815                 goto xdr_error;
 816         READ_BUF(4);
 817         READ32(open->op_create);
 818         switch (open->op_create) {
 819         case NFS4_OPEN_NOCREATE:
 820                 break;
 821         case NFS4_OPEN_CREATE:
 822                 READ_BUF(4);
 823                 READ32(open->op_createmode);
 824                 switch (open->op_createmode) {
 825                 case NFS4_CREATE_UNCHECKED:
 826                 case NFS4_CREATE_GUARDED:
 827                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 828                                 &open->op_iattr, &open->op_acl);
 829                         if (status)
 830                                 goto out;
 831                         break;
 832                 case NFS4_CREATE_EXCLUSIVE:
 833                         READ_BUF(NFS4_VERIFIER_SIZE);
 834                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 835                         break;
 836                 case NFS4_CREATE_EXCLUSIVE4_1:
 837                         if (argp->minorversion < 1)
 838                                 goto xdr_error;
 839                         READ_BUF(NFS4_VERIFIER_SIZE);
 840                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 841                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 842                                 &open->op_iattr, &open->op_acl);
 843                         if (status)
 844                                 goto out;
 845                         break;
 846                 default:
 847                         goto xdr_error;
 848                 }
 849                 break;
 850         default:
 851                 goto xdr_error;
 852         }
 853
 854         /* open_claim */
 855         READ_BUF(4);
 856         READ32(open->op_claim_type);
 857         switch (open->op_claim_type) {
 858         case NFS4_OPEN_CLAIM_NULL:
 859         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 860                 READ_BUF(4);
 861                 READ32(open->op_fname.len);
 862                 READ_BUF(open->op_fname.len);
 863                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 864                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 865                         return status;
 866                 break;
 867         case NFS4_OPEN_CLAIM_PREVIOUS:
 868                 READ_BUF(4);
 869                 READ32(open->op_delegate_type);
 870                 break;
 871         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 872                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 873                 if (status)
 874                         return status;
 875                 READ_BUF(4);
 876                 READ32(open->op_fname.len);
 877                 READ_BUF(open->op_fname.len);
 878                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 879                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 880                         return status;
 881                 break;
 882         case NFS4_OPEN_CLAIM_FH:
 883         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 884                 if (argp->minorversion < 1)
 885                         goto xdr_error;
 886                 /* void */
 887                 break;
 888         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 889                 if (argp->minorversion < 1)
 890                         goto xdr_error;
 891                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 892                 if (status)
 893                         return status;
 894                 break;
 895         default:
 896                 goto xdr_error;
 897         }
 898
 899         DECODE_TAIL;
 900 }
 901
 902 static __be32
 903 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 904 {
 905         DECODE_HEAD;
 906
 907         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 908         if (status)
 909                 return status;
 910         READ_BUF(4);
 911         READ32(open_conf->oc_seqid);
 912
 913         DECODE_TAIL;
 914 }
 915
 916 static __be32
 917 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 918 {
 919         DECODE_HEAD;
 920
 921         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 922         if (status)
 923                 return status;
 924         READ_BUF(4);
 925         READ32(open_down->od_seqid);
 926         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 927                                            &open_down->od_deleg_want, NULL);
 928         if (status)
 929                 return status;
 930         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 931         if (status)
 932                 return status;
 933         DECODE_TAIL;
 934 }
 935
 936 static __be32
 937 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 938 {
 939         DECODE_HEAD;
 940
 941         READ_BUF(4);
 942         READ32(putfh->pf_fhlen);
 943         if (putfh->pf_fhlen > NFS4_FHSIZE)
 944                 goto xdr_error;
 945         READ_BUF(putfh->pf_fhlen);
 946         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 947
 948         DECODE_TAIL;
 949 }
 950
 951 static __be32
 952 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 953 {
 954         DECODE_HEAD;
 955
 956         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 957         if (status)
 958                 return status;
 959         READ_BUF(12);
 960         READ64(read->rd_offset);
 961         READ32(read->rd_length);
 962
 963         DECODE_TAIL;
 964 }
 965
 966 static __be32
 967 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 968 {
 969         DECODE_HEAD;
 970
 971         READ_BUF(24);
 972         READ64(readdir->rd_cookie);
 973         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 974         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 975         READ32(readdir->rd_maxcount);
 976         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 977                 goto out;
 978
 979         DECODE_TAIL;
 980 }
 981
 982 static __be32
 983 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 984 {
 985         DECODE_HEAD;
 986
 987         READ_BUF(4);
 988         READ32(remove->rm_namelen);
 989         READ_BUF(remove->rm_namelen);
 990         SAVEMEM(remove->rm_name, remove->rm_namelen);
 991         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
 992                 return status;
 993
 994         DECODE_TAIL;
 995 }
 996
 997 static __be32
 998 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 999 {
1000         DECODE_HEAD;
1001
1002         READ_BUF(4);
1003         READ32(rename->rn_snamelen);
1004         READ_BUF(rename->rn_snamelen + 4);
1005         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1006         READ32(rename->rn_tnamelen);
1007         READ_BUF(rename->rn_tnamelen);
1008         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1009         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1010                 return status;
1011         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1012                 return status;
1013
1014         DECODE_TAIL;
1015 }
1016
1017 static __be32
1018 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1019 {
1020         DECODE_HEAD;
1021
1022         READ_BUF(sizeof(clientid_t));
1023         COPYMEM(clientid, sizeof(clientid_t));
1024
1025         DECODE_TAIL;
1026 }
1027
1028 static __be32
1029 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1030                      struct nfsd4_secinfo *secinfo)
1031 {
1032         DECODE_HEAD;
1033
1034         READ_BUF(4);
1035         READ32(secinfo->si_namelen);
1036         READ_BUF(secinfo->si_namelen);
1037         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1038         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1039         if (status)
1040                 return status;
1041         DECODE_TAIL;
1042 }
1043
1044 static __be32
1045 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1046                      struct nfsd4_secinfo_no_name *sin)
1047 {
1048         DECODE_HEAD;
1049
1050         READ_BUF(4);
1051         READ32(sin->sin_style);
1052         DECODE_TAIL;
1053 }
1054
1055 static __be32
1056 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1057 {
1058         __be32 status;
1059
1060         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1061         if (status)
1062                 return status;
1063         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1064                                   &setattr->sa_acl);
1065 }
1066
1067 static __be32
1068 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1069 {
1070         DECODE_HEAD;
1071
1072         READ_BUF(NFS4_VERIFIER_SIZE);
1073         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1074
1075         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1076         if (status)
1077                 return nfserr_bad_xdr;
1078         READ_BUF(8);
1079         READ32(setclientid->se_callback_prog);
1080         READ32(setclientid->se_callback_netid_len);
1081
1082         READ_BUF(setclientid->se_callback_netid_len + 4);
1083         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1084         READ32(setclientid->se_callback_addr_len);
1085
1086         READ_BUF(setclientid->se_callback_addr_len + 4);
1087         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1088         READ32(setclientid->se_callback_ident);
1089
1090         DECODE_TAIL;
1091 }
1092
1093 static __be32
1094 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1095 {
1096         DECODE_HEAD;
1097
1098         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1099         COPYMEM(&scd_c->sc_clientid, 8);
1100         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1101
1102         DECODE_TAIL;
1103 }
1104
1105 /* Also used for NVERIFY */
1106 static __be32
1107 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1108 {
1109         DECODE_HEAD;
1110
1111         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1112                 goto out;
1113
1114         /* For convenience's sake, we compare raw xdr'd attributes in
1115          * nfsd4_proc_verify */
1116
1117         READ_BUF(4);
1118         READ32(verify->ve_attrlen);
1119         READ_BUF(verify->ve_attrlen);
1120         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1121
1122         DECODE_TAIL;
1123 }
1124
1125 static __be32
1126 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1127 {
1128         int avail;
1129         int len;
1130         DECODE_HEAD;
1131
1132         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1133         if (status)
1134                 return status;
1135         READ_BUF(16);
1136         READ64(write->wr_offset);
1137         READ32(write->wr_stable_how);
1138         if (write->wr_stable_how > 2)
1139                 goto xdr_error;
1140         READ32(write->wr_buflen);
1141
1142         /* Sorry .. no magic macros for this.. *
1143          * READ_BUF(write->wr_buflen);
1144          * SAVEMEM(write->wr_buf, write->wr_buflen);
1145          */
1146         avail = (char*)argp->end - (char*)argp->p;
1147         if (avail + argp->pagelen < write->wr_buflen) {
1148                 dprintk("NFSD: xdr error (%s:%d)\n",
1149                                 __FILE__, __LINE__);
1150                 goto xdr_error;
1151         }
1152         write->wr_head.iov_base = p;
1153         write->wr_head.iov_len = avail;
1154         WARN_ON(avail != (XDR_QUADLEN(avail) << 2));
1155         write->wr_pagelist = argp->pagelist;
1156
1157         len = XDR_QUADLEN(write->wr_buflen) << 2;
1158         if (len >= avail) {
1159                 int pages;
1160
1161                 len -= avail;
1162
1163                 pages = len >> PAGE_SHIFT;
1164                 argp->pagelist += pages;
1165                 argp->pagelen -= pages * PAGE_SIZE;
1166                 len -= pages * PAGE_SIZE;
1167
1168                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1169                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1170         }
1171         argp->p += XDR_QUADLEN(len);
1172
1173         DECODE_TAIL;
1174 }
1175
1176 static __be32
1177 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1178 {
1179         DECODE_HEAD;
1180
1181         READ_BUF(12);
1182         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1183         READ32(rlockowner->rl_owner.len);
1184         READ_BUF(rlockowner->rl_owner.len);
1185         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1186
1187         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1188                 return nfserr_inval;
1189         DECODE_TAIL;
1190 }
1191
1192 static __be32
1193 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1194                          struct nfsd4_exchange_id *exid)
1195 {
1196         int dummy, tmp;
1197         DECODE_HEAD;
1198
1199         READ_BUF(NFS4_VERIFIER_SIZE);
1200         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1201
1202         status = nfsd4_decode_opaque(argp, &exid->clname);
1203         if (status)
1204                 return nfserr_bad_xdr;
1205
1206         READ_BUF(4);
1207         READ32(exid->flags);
1208
1209         /* Ignore state_protect4_a */
1210         READ_BUF(4);
1211         READ32(exid->spa_how);
1212         switch (exid->spa_how) {
1213         case SP4_NONE:
1214                 break;
1215         case SP4_MACH_CRED:
1216                 /* spo_must_enforce */
1217                 READ_BUF(4);
1218                 READ32(dummy);
1219                 READ_BUF(dummy * 4);
1220                 p += dummy;
1221
1222                 /* spo_must_allow */
1223                 READ_BUF(4);
1224                 READ32(dummy);
1225                 READ_BUF(dummy * 4);
1226                 p += dummy;
1227                 break;
1228         case SP4_SSV:
1229                 /* ssp_ops */
1230                 READ_BUF(4);
1231                 READ32(dummy);
1232                 READ_BUF(dummy * 4);
1233                 p += dummy;
1234
1235                 READ_BUF(4);
1236                 READ32(dummy);
1237                 READ_BUF(dummy * 4);
1238                 p += dummy;
1239
1240                 /* ssp_hash_algs<> */
1241                 READ_BUF(4);
1242                 READ32(tmp);
1243                 while (tmp--) {
1244                         READ_BUF(4);
1245                         READ32(dummy);
1246                         READ_BUF(dummy);
1247                         p += XDR_QUADLEN(dummy);
1248                 }
1249
1250                 /* ssp_encr_algs<> */
1251                 READ_BUF(4);
1252                 READ32(tmp);
1253                 while (tmp--) {
1254                         READ_BUF(4);
1255                         READ32(dummy);
1256                         READ_BUF(dummy);
1257                         p += XDR_QUADLEN(dummy);
1258                 }
1259
1260                 /* ssp_window and ssp_num_gss_handles */
1261                 READ_BUF(8);
1262                 READ32(dummy);
1263                 READ32(dummy);
1264                 break;
1265         default:
1266                 goto xdr_error;
1267         }
1268
1269         /* Ignore Implementation ID */
1270         READ_BUF(4);    /* nfs_impl_id4 array length */
1271         READ32(dummy);
1272
1273         if (dummy > 1)
1274                 goto xdr_error;
1275
1276         if (dummy == 1) {
1277                 /* nii_domain */
1278                 READ_BUF(4);
1279                 READ32(dummy);
1280                 READ_BUF(dummy);
1281                 p += XDR_QUADLEN(dummy);
1282
1283                 /* nii_name */
1284                 READ_BUF(4);
1285                 READ32(dummy);
1286                 READ_BUF(dummy);
1287                 p += XDR_QUADLEN(dummy);
1288
1289                 /* nii_date */
1290                 READ_BUF(12);
1291                 p += 3;
1292         }
1293         DECODE_TAIL;
1294 }
1295
1296 static __be32
1297 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1298                             struct nfsd4_create_session *sess)
1299 {
1300         DECODE_HEAD;
1301         u32 dummy;
1302
1303         READ_BUF(16);
1304         COPYMEM(&sess->clientid, 8);
1305         READ32(sess->seqid);
1306         READ32(sess->flags);
1307
1308         /* Fore channel attrs */
1309         READ_BUF(28);
1310         READ32(dummy); /* headerpadsz is always 0 */
1311         READ32(sess->fore_channel.maxreq_sz);
1312         READ32(sess->fore_channel.maxresp_sz);
1313         READ32(sess->fore_channel.maxresp_cached);
1314         READ32(sess->fore_channel.maxops);
1315         READ32(sess->fore_channel.maxreqs);
1316         READ32(sess->fore_channel.nr_rdma_attrs);
1317         if (sess->fore_channel.nr_rdma_attrs == 1) {
1318                 READ_BUF(4);
1319                 READ32(sess->fore_channel.rdma_attrs);
1320         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1321                 dprintk("Too many fore channel attr bitmaps!\n");
1322                 goto xdr_error;
1323         }
1324
1325         /* Back channel attrs */
1326         READ_BUF(28);
1327         READ32(dummy); /* headerpadsz is always 0 */
1328         READ32(sess->back_channel.maxreq_sz);
1329         READ32(sess->back_channel.maxresp_sz);
1330         READ32(sess->back_channel.maxresp_cached);
1331         READ32(sess->back_channel.maxops);
1332         READ32(sess->back_channel.maxreqs);
1333         READ32(sess->back_channel.nr_rdma_attrs);
1334         if (sess->back_channel.nr_rdma_attrs == 1) {
1335                 READ_BUF(4);
1336                 READ32(sess->back_channel.rdma_attrs);
1337         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1338                 dprintk("Too many back channel attr bitmaps!\n");
1339                 goto xdr_error;
1340         }
1341
1342         READ_BUF(4);
1343         READ32(sess->callback_prog);
1344         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1345         DECODE_TAIL;
1346 }
1347
1348 static __be32
1349 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1350                              struct nfsd4_destroy_session *destroy_session)
1351 {
1352         DECODE_HEAD;
1353         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1354         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1355
1356         DECODE_TAIL;
1357 }
1358
1359 static __be32
1360 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1361                           struct nfsd4_free_stateid *free_stateid)
1362 {
1363         DECODE_HEAD;
1364
1365         READ_BUF(sizeof(stateid_t));
1366         READ32(free_stateid->fr_stateid.si_generation);
1367         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1368
1369         DECODE_TAIL;
1370 }
1371
1372 static __be32
1373 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1374                       struct nfsd4_sequence *seq)
1375 {
1376         DECODE_HEAD;
1377
1378         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1379         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1380         READ32(seq->seqid);
1381         READ32(seq->slotid);
1382         READ32(seq->maxslots);
1383         READ32(seq->cachethis);
1384
1385         DECODE_TAIL;
1386 }
1387
1388 static __be32
1389 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1390 {
1391         int i;
1392         __be32 *p, status;
1393         struct nfsd4_test_stateid_id *stateid;
1394
1395         READ_BUF(4);
1396         test_stateid->ts_num_ids = ntohl(*p++);
1397
1398         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1399
1400         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1401                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1402                 if (!stateid) {
1403                         status = nfserrno(-ENOMEM);
1404                         goto out;
1405                 }
1406
1407                 defer_free(argp, kfree, stateid);
1408                 INIT_LIST_HEAD(&stateid->ts_id_list);
1409                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1410
1411                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1412                 if (status)
1413                         goto out;
1414         }
1415
1416         status = 0;
1417 out:
1418         return status;
1419 xdr_error:
1420         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1421         status = nfserr_bad_xdr;
1422         goto out;
1423 }
1424
1425 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1426 {
1427         DECODE_HEAD;
1428
1429         READ_BUF(8);
1430         COPYMEM(&dc->clientid, 8);
1431
1432         DECODE_TAIL;
1433 }
1434
1435 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1436 {
1437         DECODE_HEAD;
1438
1439         READ_BUF(4);
1440         READ32(rc->rca_one_fs);
1441
1442         DECODE_TAIL;
1443 }
1444
1445 static __be32
1446 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1447 {
1448         return nfs_ok;
1449 }
1450
1451 static __be32
1452 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1453 {
1454         return nfserr_notsupp;
1455 }
1456
1457 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1458
1459 static nfsd4_dec nfsd4_dec_ops[] = {
1460         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1461         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1462         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1463         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1464         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1465         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1466         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1467         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1468         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1469         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1470         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1471         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1472         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1473         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1474         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1475         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1476         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1477         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1478         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1479         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1480         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1481         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1482         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1483         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1484         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1485         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1486         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1487         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1488         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1489         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1490         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1491         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1492         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1493         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1494         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1495         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1496         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1497 };
1498
1499 static nfsd4_dec nfsd41_dec_ops[] = {
1500         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1501         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1502         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1503         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1504         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1505         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1506         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1507         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1508         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1509         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1510         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1511         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1512         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1513         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1514         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1515         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1516         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1517         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1518         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1519         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1520         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1521         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1522         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1523         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1524         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1525         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1526         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1527         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1528         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1529         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1530         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1531         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1532         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1533         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1534         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1535         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1536         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1537
1538         /* new operations for NFSv4.1 */
1539         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1540         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1541         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1542         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1543         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1544         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1545         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1546         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1547         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1548         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1549         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1550         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1551         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1552         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1553         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1554         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1555         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1556         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1557         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1558 };
1559
1560 struct nfsd4_minorversion_ops {
1561         nfsd4_dec *decoders;
1562         int nops;
1563 };
1564
1565 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1566         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1567         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1568 };
1569
1570 static __be32
1571 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1572 {
1573         DECODE_HEAD;
1574         struct nfsd4_op *op;
1575         struct nfsd4_minorversion_ops *ops;
1576         bool cachethis = false;
1577         int i;
1578
1579         READ_BUF(4);
1580         READ32(argp->taglen);
1581         READ_BUF(argp->taglen + 8);
1582         SAVEMEM(argp->tag, argp->taglen);
1583         READ32(argp->minorversion);
1584         READ32(argp->opcnt);
1585
1586         if (argp->taglen > NFSD4_MAX_TAGLEN)
1587                 goto xdr_error;
1588         if (argp->opcnt > 100)
1589                 goto xdr_error;
1590
1591         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1592                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1593                 if (!argp->ops) {
1594                         argp->ops = argp->iops;
1595                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1596                         goto xdr_error;
1597                 }
1598         }
1599
1600         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1601                 argp->opcnt = 0;
1602
1603         ops = &nfsd4_minorversion[argp->minorversion];
1604         for (i = 0; i < argp->opcnt; i++) {
1605                 op = &argp->ops[i];
1606                 op->replay = NULL;
1607
1608                 READ_BUF(4);
1609                 READ32(op->opnum);
1610
1611                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1612                         op->status = ops->decoders[op->opnum](argp, &op->u);
1613                 else {
1614                         op->opnum = OP_ILLEGAL;
1615                         op->status = nfserr_op_illegal;
1616                 }
1617
1618                 if (op->status) {
1619                         argp->opcnt = i+1;
1620                         break;
1621                 }
1622                 /*
1623                  * We'll try to cache the result in the DRC if any one
1624                  * op in the compound wants to be cached:
1625                  */
1626                 cachethis |= nfsd4_cache_this_op(op);
1627         }
1628         /* Sessions make the DRC unnecessary: */
1629         if (argp->minorversion)
1630                 cachethis = false;
1631         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1632
1633         DECODE_TAIL;
1634 }
1635
1636 #define WRITE32(n)               *p++ = htonl(n)
1637 #define WRITE64(n)               do {                           \
1638         *p++ = htonl((u32)((n) >> 32));                         \
1639         *p++ = htonl((u32)(n));                                 \
1640 } while (0)
1641 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1642         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1643         memcpy(p, ptr, nbytes);                                 \
1644         p += XDR_QUADLEN(nbytes);                               \
1645 }} while (0)
1646
1647 static void write32(__be32 **p, u32 n)
1648 {
1649         *(*p)++ = htonl(n);
1650 }
1651
1652 static void write64(__be32 **p, u64 n)
1653 {
1654         write32(p, (n >> 32));
1655         write32(p, (u32)n);
1656 }
1657
1658 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1659 {
1660         if (IS_I_VERSION(inode)) {
1661                 write64(p, inode->i_version);
1662         } else {
1663                 write32(p, stat->ctime.tv_sec);
1664                 write32(p, stat->ctime.tv_nsec);
1665         }
1666 }
1667
1668 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1669 {
1670         write32(p, c->atomic);
1671         if (c->change_supported) {
1672                 write64(p, c->before_change);
1673                 write64(p, c->after_change);
1674         } else {
1675                 write32(p, c->before_ctime_sec);
1676                 write32(p, c->before_ctime_nsec);
1677                 write32(p, c->after_ctime_sec);
1678                 write32(p, c->after_ctime_nsec);
1679         }
1680 }
1681
1682 #define RESERVE_SPACE(nbytes)   do {                            \
1683         p = resp->p;                                            \
1684         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1685 } while (0)
1686 #define ADJUST_ARGS()           resp->p = p
1687
1688 /*
1689  * Header routine to setup seqid operation replay cache
1690  */
1691 #define ENCODE_SEQID_OP_HEAD                                    \
1692         __be32 *save;                                           \
1693                                                                 \
1694         save = resp->p;
1695
1696 /*
1697  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1698  * is where sequence id's are incremented, and the replay cache is filled.
1699  * Note that we increment sequence id's here, at the last moment, so we're sure
1700  * we know whether the error to be returned is a sequence id mutating error.
1701  */
1702
1703 static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
1704 {
1705         struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;
1706
1707         if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
1708                 stateowner->so_seqid++;
1709                 stateowner->so_replay.rp_status = nfserr;
1710                 stateowner->so_replay.rp_buflen =
1711                           (char *)resp->p - (char *)save;
1712                 memcpy(stateowner->so_replay.rp_buf, save,
1713                         stateowner->so_replay.rp_buflen);
1714                 nfsd4_purge_closed_stateid(stateowner);
1715         }
1716 }
1717
1718 /* Encode as an array of strings the string given with components
1719  * separated @sep, escaped with esc_enter and esc_exit.
1720  */
1721 static __be32 nfsd4_encode_components_esc(char sep, char *components,
1722                                    __be32 **pp, int *buflen,
1723                                    char esc_enter, char esc_exit)
1724 {
1725         __be32 *p = *pp;
1726         __be32 *countp = p;
1727         int strlen, count=0;
1728         char *str, *end, *next;
1729
1730         dprintk("nfsd4_encode_components(%s)\n", components);
1731         if ((*buflen -= 4) < 0)
1732                 return nfserr_resource;
1733         WRITE32(0); /* We will fill this in with @count later */
1734         end = str = components;
1735         while (*end) {
1736                 bool found_esc = false;
1737
1738                 /* try to parse as esc_start, ..., esc_end, sep */
1739                 if (*str == esc_enter) {
1740                         for (; *end && (*end != esc_exit); end++)
1741                                 /* find esc_exit or end of string */;
1742                         next = end + 1;
1743                         if (*end && (!*next || *next == sep)) {
1744                                 str++;
1745                                 found_esc = true;
1746                         }
1747                 }
1748
1749                 if (!found_esc)
1750                         for (; *end && (*end != sep); end++)
1751                                 /* find sep or end of string */;
1752
1753                 strlen = end - str;
1754                 if (strlen) {
1755                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1756                                 return nfserr_resource;
1757                         WRITE32(strlen);
1758                         WRITEMEM(str, strlen);
1759                         count++;
1760                 }
1761                 else
1762                         end++;
1763                 str = end;
1764         }
1765         *pp = p;
1766         p = countp;
1767         WRITE32(count);
1768         return 0;
1769 }
1770
1771 /* Encode as an array of strings the string given with components
1772  * separated @sep.
1773  */
1774 static __be32 nfsd4_encode_components(char sep, char *components,
1775                                    __be32 **pp, int *buflen)
1776 {
1777         return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1778 }
1779
1780 /*
1781  * encode a location element of a fs_locations structure
1782  */
1783 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1784                                     __be32 **pp, int *buflen)
1785 {
1786         __be32 status;
1787         __be32 *p = *pp;
1788
1789         status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1790                                                 '[', ']');
1791         if (status)
1792                 return status;
1793         status = nfsd4_encode_components('/', location->path, &p, buflen);
1794         if (status)
1795                 return status;
1796         *pp = p;
1797         return 0;
1798 }
1799
1800 /*
1801  * Encode a path in RFC3530 'pathname4' format
1802  */
1803 static __be32 nfsd4_encode_path(const struct path *root,
1804                 const struct path *path, __be32 **pp, int *buflen)
1805 {
1806         struct path cur = {
1807                 .mnt = path->mnt,
1808                 .dentry = path->dentry,
1809         };
1810         __be32 *p = *pp;
1811         struct dentry **components = NULL;
1812         unsigned int ncomponents = 0;
1813         __be32 err = nfserr_jukebox;
1814
1815         dprintk("nfsd4_encode_components(");
1816
1817         path_get(&cur);
1818         /* First walk the path up to the nfsd root, and store the
1819          * dentries/path components in an array.
1820          */
1821         for (;;) {
1822                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1823                         break;
1824                 if (cur.dentry == cur.mnt->mnt_root) {
1825                         if (follow_up(&cur))
1826                                 continue;
1827                         goto out_free;
1828                 }
1829                 if ((ncomponents & 15) == 0) {
1830                         struct dentry **new;
1831                         new = krealloc(components,
1832                                         sizeof(*new) * (ncomponents + 16),
1833                                         GFP_KERNEL);
1834                         if (!new)
1835                                 goto out_free;
1836                         components = new;
1837                 }
1838                 components[ncomponents++] = cur.dentry;
1839                 cur.dentry = dget_parent(cur.dentry);
1840         }
1841
1842         *buflen -= 4;
1843         if (*buflen < 0)
1844                 goto out_free;
1845         WRITE32(ncomponents);
1846
1847         while (ncomponents) {
1848                 struct dentry *dentry = components[ncomponents - 1];
1849                 unsigned int len = dentry->d_name.len;
1850
1851                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1852                 if (*buflen < 0)
1853                         goto out_free;
1854                 WRITE32(len);
1855                 WRITEMEM(dentry->d_name.name, len);
1856                 dprintk("/%s", dentry->d_name.name);
1857                 dput(dentry);
1858                 ncomponents--;
1859         }
1860
1861         *pp = p;
1862         err = 0;
1863 out_free:
1864         dprintk(")\n");
1865         while (ncomponents)
1866                 dput(components[--ncomponents]);
1867         kfree(components);
1868         path_put(&cur);
1869         return err;
1870 }
1871
1872 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1873                 const struct path *path, __be32 **pp, int *buflen)
1874 {
1875         struct svc_export *exp_ps;
1876         __be32 res;
1877
1878         exp_ps = rqst_find_fsidzero_export(rqstp);
1879         if (IS_ERR(exp_ps))
1880                 return nfserrno(PTR_ERR(exp_ps));
1881         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1882         exp_put(exp_ps);
1883         return res;
1884 }
1885
1886 /*
1887  *  encode a fs_locations structure
1888  */
1889 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1890                                      struct svc_export *exp,
1891                                      __be32 **pp, int *buflen)
1892 {
1893         __be32 status;
1894         int i;
1895         __be32 *p = *pp;
1896         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1897
1898         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1899         if (status)
1900                 return status;
1901         if ((*buflen -= 4) < 0)
1902                 return nfserr_resource;
1903         WRITE32(fslocs->locations_count);
1904         for (i=0; i<fslocs->locations_count; i++) {
1905                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1906                                                    &p, buflen);
1907                 if (status)
1908                         return status;
1909         }
1910         *pp = p;
1911         return 0;
1912 }
1913
1914 static u32 nfs4_file_type(umode_t mode)
1915 {
1916         switch (mode & S_IFMT) {
1917         case S_IFIFO:   return NF4FIFO;
1918         case S_IFCHR:   return NF4CHR;
1919         case S_IFDIR:   return NF4DIR;
1920         case S_IFBLK:   return NF4BLK;
1921         case S_IFLNK:   return NF4LNK;
1922         case S_IFREG:   return NF4REG;
1923         case S_IFSOCK:  return NF4SOCK;
1924         default:        return NF4BAD;
1925         };
1926 }
1927
1928 static __be32
1929 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1930                         __be32 **p, int *buflen)
1931 {
1932         int status;
1933
1934         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1935                 return nfserr_resource;
1936         if (whotype != NFS4_ACL_WHO_NAMED)
1937                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1938         else if (group)
1939                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1940         else
1941                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1942         if (status < 0)
1943                 return nfserrno(status);
1944         *p = xdr_encode_opaque(*p, NULL, status);
1945         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1946         BUG_ON(*buflen < 0);
1947         return 0;
1948 }
1949
1950 static inline __be32
1951 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1952 {
1953         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1954 }
1955
1956 static inline __be32
1957 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1958 {
1959         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1960 }
1961
1962 static inline __be32
1963 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1964                 __be32 **p, int *buflen)
1965 {
1966         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1967 }
1968
1969 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1970                               FATTR4_WORD0_RDATTR_ERROR)
1971 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1972
1973 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1974 {
1975         /* As per referral draft:  */
1976         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1977             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1978                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1979                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1980                         *rdattr_err = NFSERR_MOVED;
1981                 else
1982                         return nfserr_moved;
1983         }
1984         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1985         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1986         return 0;
1987 }
1988
1989
1990 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
1991 {
1992         struct path path = exp->ex_path;
1993         int err;
1994
1995         path_get(&path);
1996         while (follow_up(&path)) {
1997                 if (path.dentry != path.mnt->mnt_root)
1998                         break;
1999         }
2000         err = vfs_getattr(path.mnt, path.dentry, stat);
2001         path_put(&path);
2002         return err;
2003 }
2004
2005 /*
2006  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2007  * ourselves.
2008  *
2009  * @countp is the buffer size in _words_; upon successful return this becomes
2010  * replaced with the number of words written.
2011  */
2012 __be32
2013 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2014                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
2015                 struct svc_rqst *rqstp, int ignore_crossmnt)
2016 {
2017         u32 bmval0 = bmval[0];
2018         u32 bmval1 = bmval[1];
2019         u32 bmval2 = bmval[2];
2020         struct kstat stat;
2021         struct svc_fh tempfh;
2022         struct kstatfs statfs;
2023         int buflen = *countp << 2;
2024         __be32 *attrlenp;
2025         u32 dummy;
2026         u64 dummy64;
2027         u32 rdattr_err = 0;
2028         __be32 *p = buffer;
2029         __be32 status;
2030         int err;
2031         int aclsupport = 0;
2032         struct nfs4_acl *acl = NULL;
2033         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2034         u32 minorversion = resp->cstate.minorversion;
2035         struct path path = {
2036                 .mnt    = exp->ex_path.mnt,
2037                 .dentry = dentry,
2038         };
2039         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2040
2041         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2042         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2043         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2044         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2045
2046         if (exp->ex_fslocs.migrated) {
2047                 BUG_ON(bmval[2]);
2048                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2049                 if (status)
2050                         goto out;
2051         }
2052
2053         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
2054         if (err)
2055                 goto out_nfserr;
2056         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2057                         FATTR4_WORD0_MAXNAME)) ||
2058             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2059                        FATTR4_WORD1_SPACE_TOTAL))) {
2060                 err = vfs_statfs(&path, &statfs);
2061                 if (err)
2062                         goto out_nfserr;
2063         }
2064         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2065                 fh_init(&tempfh, NFS4_FHSIZE);
2066                 status = fh_compose(&tempfh, exp, dentry, NULL);
2067                 if (status)
2068                         goto out;
2069                 fhp = &tempfh;
2070         }
2071         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2072                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2073                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2074                 aclsupport = (err == 0);
2075                 if (bmval0 & FATTR4_WORD0_ACL) {
2076                         if (err == -EOPNOTSUPP)
2077                                 bmval0 &= ~FATTR4_WORD0_ACL;
2078                         else if (err == -EINVAL) {
2079                                 status = nfserr_attrnotsupp;
2080                                 goto out;
2081                         } else if (err != 0)
2082                                 goto out_nfserr;
2083                 }
2084         }
2085
2086         if (bmval2) {
2087                 if ((buflen -= 16) < 0)
2088                         goto out_resource;
2089                 WRITE32(3);
2090                 WRITE32(bmval0);
2091                 WRITE32(bmval1);
2092                 WRITE32(bmval2);
2093         } else if (bmval1) {
2094                 if ((buflen -= 12) < 0)
2095                         goto out_resource;
2096                 WRITE32(2);
2097                 WRITE32(bmval0);
2098                 WRITE32(bmval1);
2099         } else {
2100                 if ((buflen -= 8) < 0)
2101                         goto out_resource;
2102                 WRITE32(1);
2103                 WRITE32(bmval0);
2104         }
2105         attrlenp = p++;                /* to be backfilled later */
2106
2107         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2108                 u32 word0 = nfsd_suppattrs0(minorversion);
2109                 u32 word1 = nfsd_suppattrs1(minorversion);
2110                 u32 word2 = nfsd_suppattrs2(minorversion);
2111
2112                 if (!aclsupport)
2113                         word0 &= ~FATTR4_WORD0_ACL;
2114                 if (!word2) {
2115                         if ((buflen -= 12) < 0)
2116                                 goto out_resource;
2117                         WRITE32(2);
2118                         WRITE32(word0);
2119                         WRITE32(word1);
2120                 } else {
2121                         if ((buflen -= 16) < 0)
2122                                 goto out_resource;
2123                         WRITE32(3);
2124                         WRITE32(word0);
2125                         WRITE32(word1);
2126                         WRITE32(word2);
2127                 }
2128         }
2129         if (bmval0 & FATTR4_WORD0_TYPE) {
2130                 if ((buflen -= 4) < 0)
2131                         goto out_resource;
2132                 dummy = nfs4_file_type(stat.mode);
2133                 if (dummy == NF4BAD)
2134                         goto out_serverfault;
2135                 WRITE32(dummy);
2136         }
2137         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2138                 if ((buflen -= 4) < 0)
2139                         goto out_resource;
2140                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2141                         WRITE32(NFS4_FH_PERSISTENT);
2142                 else
2143                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2144         }
2145         if (bmval0 & FATTR4_WORD0_CHANGE) {
2146                 if ((buflen -= 8) < 0)
2147                         goto out_resource;
2148                 write_change(&p, &stat, dentry->d_inode);
2149         }
2150         if (bmval0 & FATTR4_WORD0_SIZE) {
2151                 if ((buflen -= 8) < 0)
2152                         goto out_resource;
2153                 WRITE64(stat.size);
2154         }
2155         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2156                 if ((buflen -= 4) < 0)
2157                         goto out_resource;
2158                 WRITE32(1);
2159         }
2160         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2161                 if ((buflen -= 4) < 0)
2162                         goto out_resource;
2163                 WRITE32(1);
2164         }
2165         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2166                 if ((buflen -= 4) < 0)
2167                         goto out_resource;
2168                 WRITE32(0);
2169         }
2170         if (bmval0 & FATTR4_WORD0_FSID) {
2171                 if ((buflen -= 16) < 0)
2172                         goto out_resource;
2173                 if (exp->ex_fslocs.migrated) {
2174                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2175                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2176                 } else switch(fsid_source(fhp)) {
2177                 case FSIDSOURCE_FSID:
2178                         WRITE64((u64)exp->ex_fsid);
2179                         WRITE64((u64)0);
2180                         break;
2181                 case FSIDSOURCE_DEV:
2182                         WRITE32(0);
2183                         WRITE32(MAJOR(stat.dev));
2184                         WRITE32(0);
2185                         WRITE32(MINOR(stat.dev));
2186                         break;
2187                 case FSIDSOURCE_UUID:
2188                         WRITEMEM(exp->ex_uuid, 16);
2189                         break;
2190                 }
2191         }
2192         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2193                 if ((buflen -= 4) < 0)
2194                         goto out_resource;
2195                 WRITE32(0);
2196         }
2197         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2198                 if ((buflen -= 4) < 0)
2199                         goto out_resource;
2200                 WRITE32(nn->nfsd4_lease);
2201         }
2202         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2203                 if ((buflen -= 4) < 0)
2204                         goto out_resource;
2205                 WRITE32(rdattr_err);
2206         }
2207         if (bmval0 & FATTR4_WORD0_ACL) {
2208                 struct nfs4_ace *ace;
2209
2210                 if (acl == NULL) {
2211                         if ((buflen -= 4) < 0)
2212                                 goto out_resource;
2213
2214                         WRITE32(0);
2215                         goto out_acl;
2216                 }
2217                 if ((buflen -= 4) < 0)
2218                         goto out_resource;
2219                 WRITE32(acl->naces);
2220
2221                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2222                         if ((buflen -= 4*3) < 0)
2223                                 goto out_resource;
2224                         WRITE32(ace->type);
2225                         WRITE32(ace->flag);
2226                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2227                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
2228                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2229                                 &p, &buflen);
2230                         if (status == nfserr_resource)
2231                                 goto out_resource;
2232                         if (status)
2233                                 goto out;
2234                 }
2235         }
2236 out_acl:
2237         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2238                 if ((buflen -= 4) < 0)
2239                         goto out_resource;
2240                 WRITE32(aclsupport ?
2241                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2242         }
2243         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2244                 if ((buflen -= 4) < 0)
2245                         goto out_resource;
2246                 WRITE32(1);
2247         }
2248         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2249                 if ((buflen -= 4) < 0)
2250                         goto out_resource;
2251                 WRITE32(0);
2252         }
2253         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2254                 if ((buflen -= 4) < 0)
2255                         goto out_resource;
2256                 WRITE32(1);
2257         }
2258         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2259                 if ((buflen -= 4) < 0)
2260                         goto out_resource;
2261                 WRITE32(1);
2262         }
2263         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2264                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2265                 if (buflen < 0)
2266                         goto out_resource;
2267                 WRITE32(fhp->fh_handle.fh_size);
2268                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2269         }
2270         if (bmval0 & FATTR4_WORD0_FILEID) {
2271                 if ((buflen -= 8) < 0)
2272                         goto out_resource;
2273                 WRITE64(stat.ino);
2274         }
2275         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2276                 if ((buflen -= 8) < 0)
2277                         goto out_resource;
2278                 WRITE64((u64) statfs.f_ffree);
2279         }
2280         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2281                 if ((buflen -= 8) < 0)
2282                         goto out_resource;
2283                 WRITE64((u64) statfs.f_ffree);
2284         }
2285         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2286                 if ((buflen -= 8) < 0)
2287                         goto out_resource;
2288                 WRITE64((u64) statfs.f_files);
2289         }
2290         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2291                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2292                 if (status == nfserr_resource)
2293                         goto out_resource;
2294                 if (status)
2295                         goto out;
2296         }
2297         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2298                 if ((buflen -= 4) < 0)
2299                         goto out_resource;
2300                 WRITE32(1);
2301         }
2302         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2303                 if ((buflen -= 8) < 0)
2304                         goto out_resource;
2305                 WRITE64(~(u64)0);
2306         }
2307         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2308                 if ((buflen -= 4) < 0)
2309                         goto out_resource;
2310                 WRITE32(255);
2311         }
2312         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2313                 if ((buflen -= 4) < 0)
2314                         goto out_resource;
2315                 WRITE32(statfs.f_namelen);
2316         }
2317         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2318                 if ((buflen -= 8) < 0)
2319                         goto out_resource;
2320                 WRITE64((u64) svc_max_payload(rqstp));
2321         }
2322         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2323                 if ((buflen -= 8) < 0)
2324                         goto out_resource;
2325                 WRITE64((u64) svc_max_payload(rqstp));
2326         }
2327         if (bmval1 & FATTR4_WORD1_MODE) {
2328                 if ((buflen -= 4) < 0)
2329                         goto out_resource;
2330                 WRITE32(stat.mode & S_IALLUGO);
2331         }
2332         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2333                 if ((buflen -= 4) < 0)
2334                         goto out_resource;
2335                 WRITE32(1);
2336         }
2337         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2338                 if ((buflen -= 4) < 0)
2339                         goto out_resource;
2340                 WRITE32(stat.nlink);
2341         }
2342         if (bmval1 & FATTR4_WORD1_OWNER) {
2343                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2344                 if (status == nfserr_resource)
2345                         goto out_resource;
2346                 if (status)
2347                         goto out;
2348         }
2349         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2350                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2351                 if (status == nfserr_resource)
2352                         goto out_resource;
2353                 if (status)
2354                         goto out;
2355         }
2356         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2357                 if ((buflen -= 8) < 0)
2358                         goto out_resource;
2359                 WRITE32((u32) MAJOR(stat.rdev));
2360                 WRITE32((u32) MINOR(stat.rdev));
2361         }
2362         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2363                 if ((buflen -= 8) < 0)
2364                         goto out_resource;
2365                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2366                 WRITE64(dummy64);
2367         }
2368         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2369                 if ((buflen -= 8) < 0)
2370                         goto out_resource;
2371                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2372                 WRITE64(dummy64);
2373         }
2374         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2375                 if ((buflen -= 8) < 0)
2376                         goto out_resource;
2377                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2378                 WRITE64(dummy64);
2379         }
2380         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2381                 if ((buflen -= 8) < 0)
2382                         goto out_resource;
2383                 dummy64 = (u64)stat.blocks << 9;
2384                 WRITE64(dummy64);
2385         }
2386         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2387                 if ((buflen -= 12) < 0)
2388                         goto out_resource;
2389                 WRITE32(0);
2390                 WRITE32(stat.atime.tv_sec);
2391                 WRITE32(stat.atime.tv_nsec);
2392         }
2393         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2394                 if ((buflen -= 12) < 0)
2395                         goto out_resource;
2396                 WRITE32(0);
2397                 WRITE32(1);
2398                 WRITE32(0);
2399         }
2400         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2401                 if ((buflen -= 12) < 0)
2402                         goto out_resource;
2403                 WRITE32(0);
2404                 WRITE32(stat.ctime.tv_sec);
2405                 WRITE32(stat.ctime.tv_nsec);
2406         }
2407         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2408                 if ((buflen -= 12) < 0)
2409                         goto out_resource;
2410                 WRITE32(0);
2411                 WRITE32(stat.mtime.tv_sec);
2412                 WRITE32(stat.mtime.tv_nsec);
2413         }
2414         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2415                 if ((buflen -= 8) < 0)
2416                         goto out_resource;
2417                 /*
2418                  * Get parent's attributes if not ignoring crossmount
2419                  * and this is the root of a cross-mounted filesystem.
2420                  */
2421                 if (ignore_crossmnt == 0 &&
2422                     dentry == exp->ex_path.mnt->mnt_root)
2423                         get_parent_attributes(exp, &stat);
2424                 WRITE64(stat.ino);
2425         }
2426         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2427                 WRITE32(3);
2428                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2429                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2430                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2431         }
2432
2433         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2434         *countp = p - buffer;
2435         status = nfs_ok;
2436
2437 out:
2438         kfree(acl);
2439         if (fhp == &tempfh)
2440                 fh_put(&tempfh);
2441         return status;
2442 out_nfserr:
2443         status = nfserrno(err);
2444         goto out;
2445 out_resource:
2446         *countp = 0;
2447         status = nfserr_resource;
2448         goto out;
2449 out_serverfault:
2450         status = nfserr_serverfault;
2451         goto out;
2452 }
2453
2454 static inline int attributes_need_mount(u32 *bmval)
2455 {
2456         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2457                 return 1;
2458         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2459                 return 1;
2460         return 0;
2461 }
2462
2463 static __be32
2464 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2465                 const char *name, int namlen, __be32 *p, int *buflen)
2466 {
2467         struct svc_export *exp = cd->rd_fhp->fh_export;
2468         struct dentry *dentry;
2469         __be32 nfserr;
2470         int ignore_crossmnt = 0;
2471
2472         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2473         if (IS_ERR(dentry))
2474                 return nfserrno(PTR_ERR(dentry));
2475         if (!dentry->d_inode) {
2476                 /*
2477                  * nfsd_buffered_readdir drops the i_mutex between
2478                  * readdir and calling this callback, leaving a window
2479                  * where this directory entry could have gone away.
2480                  */
2481                 dput(dentry);
2482                 return nfserr_noent;
2483         }
2484
2485         exp_get(exp);
2486         /*
2487          * In the case of a mountpoint, the client may be asking for
2488          * attributes that are only properties of the underlying filesystem
2489          * as opposed to the cross-mounted file system. In such a case,
2490          * we will not follow the cross mount and will fill the attribtutes
2491          * directly from the mountpoint dentry.
2492          */
2493         if (nfsd_mountpoint(dentry, exp)) {
2494                 int err;
2495
2496                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2497                                 && !attributes_need_mount(cd->rd_bmval)) {
2498                         ignore_crossmnt = 1;
2499                         goto out_encode;
2500                 }
2501                 /*
2502                  * Why the heck aren't we just using nfsd_lookup??
2503                  * Different "."/".." handling?  Something else?
2504                  * At least, add a comment here to explain....
2505                  */
2506                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2507                 if (err) {
2508                         nfserr = nfserrno(err);
2509                         goto out_put;
2510                 }
2511                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2512                 if (nfserr)
2513                         goto out_put;
2514
2515         }
2516 out_encode:
2517         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2518                                         cd->rd_rqstp, ignore_crossmnt);
2519 out_put:
2520         dput(dentry);
2521         exp_put(exp);
2522         return nfserr;
2523 }
2524
2525 static __be32 *
2526 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2527 {
2528         __be32 *attrlenp;
2529
2530         if (buflen < 6)
2531                 return NULL;
2532         *p++ = htonl(2);
2533         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2534         *p++ = htonl(0);                         /* bmval1 */
2535
2536         attrlenp = p++;
2537         *p++ = nfserr;       /* no htonl */
2538         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2539         return p;
2540 }
2541
2542 static int
2543 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2544                     loff_t offset, u64 ino, unsigned int d_type)
2545 {
2546         struct readdir_cd *ccd = ccdv;
2547         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2548         int buflen;
2549         __be32 *p = cd->buffer;
2550         __be32 *cookiep;
2551         __be32 nfserr = nfserr_toosmall;
2552
2553         /* In nfsv4, "." and ".." never make it onto the wire.. */
2554         if (name && isdotent(name, namlen)) {
2555                 cd->common.err = nfs_ok;
2556                 return 0;
2557         }
2558
2559         if (cd->offset)
2560                 xdr_encode_hyper(cd->offset, (u64) offset);
2561
2562         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2563         if (buflen < 0)
2564                 goto fail;
2565
2566         *p++ = xdr_one;                             /* mark entry present */
2567         cookiep = p;
2568         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2569         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2570
2571         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2572         switch (nfserr) {
2573         case nfs_ok:
2574                 p += buflen;
2575                 break;
2576         case nfserr_resource:
2577                 nfserr = nfserr_toosmall;
2578                 goto fail;
2579         case nfserr_noent:
2580                 goto skip_entry;
2581         default:
2582                 /*
2583                  * If the client requested the RDATTR_ERROR attribute,
2584                  * we stuff the error code into this attribute
2585                  * and continue.  If this attribute was not requested,
2586                  * then in accordance with the spec, we fail the
2587                  * entire READDIR operation(!)
2588                  */
2589                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2590                         goto fail;
2591                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2592                 if (p == NULL) {
2593                         nfserr = nfserr_toosmall;
2594                         goto fail;
2595                 }
2596         }
2597         cd->buflen -= (p - cd->buffer);
2598         cd->buffer = p;
2599         cd->offset = cookiep;
2600 skip_entry:
2601         cd->common.err = nfs_ok;
2602         return 0;
2603 fail:
2604         cd->common.err = nfserr;
2605         return -EINVAL;
2606 }
2607
2608 static void
2609 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2610 {
2611         __be32 *p;
2612
2613         RESERVE_SPACE(sizeof(stateid_t));
2614         WRITE32(sid->si_generation);
2615         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2616         ADJUST_ARGS();
2617 }
2618
2619 static __be32
2620 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2621 {
2622         __be32 *p;
2623
2624         if (!nfserr) {
2625                 RESERVE_SPACE(8);
2626                 WRITE32(access->ac_supported);
2627                 WRITE32(access->ac_resp_access);
2628                 ADJUST_ARGS();
2629         }
2630         return nfserr;
2631 }
2632
2633 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2634 {
2635         __be32 *p;
2636
2637         if (!nfserr) {
2638                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2639                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2640                 WRITE32(bcts->dir);
2641                 /* Sorry, we do not yet support RDMA over 4.1: */
2642                 WRITE32(0);
2643                 ADJUST_ARGS();
2644         }
2645         return nfserr;
2646 }
2647
2648 static __be32
2649 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2650 {
2651         ENCODE_SEQID_OP_HEAD;
2652
2653         if (!nfserr)
2654                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2655
2656         encode_seqid_op_tail(resp, save, nfserr);
2657         return nfserr;
2658 }
2659
2660
2661 static __be32
2662 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2663 {
2664         __be32 *p;
2665
2666         if (!nfserr) {
2667                 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2668                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2669                 ADJUST_ARGS();
2670         }
2671         return nfserr;
2672 }
2673
2674 static __be32
2675 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2676 {
2677         __be32 *p;
2678
2679         if (!nfserr) {
2680                 RESERVE_SPACE(32);
2681                 write_cinfo(&p, &create->cr_cinfo);
2682                 WRITE32(2);
2683                 WRITE32(create->cr_bmval[0]);
2684                 WRITE32(create->cr_bmval[1]);
2685                 ADJUST_ARGS();
2686         }
2687         return nfserr;
2688 }
2689
2690 static __be32
2691 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2692 {
2693         struct svc_fh *fhp = getattr->ga_fhp;
2694         int buflen;
2695
2696         if (nfserr)
2697                 return nfserr;
2698
2699         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2700         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2701                                     resp->p, &buflen, getattr->ga_bmval,
2702                                     resp->rqstp, 0);
2703         if (!nfserr)
2704                 resp->p += buflen;
2705         return nfserr;
2706 }
2707
2708 static __be32
2709 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2710 {
2711         struct svc_fh *fhp = *fhpp;
2712         unsigned int len;
2713         __be32 *p;
2714
2715         if (!nfserr) {
2716                 len = fhp->fh_handle.fh_size;
2717                 RESERVE_SPACE(len + 4);
2718                 WRITE32(len);
2719                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2720                 ADJUST_ARGS();
2721         }
2722         return nfserr;
2723 }
2724
2725 /*
2726 * Including all fields other than the name, a LOCK4denied structure requires
2727 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2728 */
2729 static void
2730 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2731 {
2732         struct xdr_netobj *conf = &ld->ld_owner;
2733         __be32 *p;
2734
2735         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2736         WRITE64(ld->ld_start);
2737         WRITE64(ld->ld_length);
2738         WRITE32(ld->ld_type);
2739         if (conf->len) {
2740                 WRITEMEM(&ld->ld_clientid, 8);
2741                 WRITE32(conf->len);
2742                 WRITEMEM(conf->data, conf->len);
2743                 kfree(conf->data);
2744         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2745                 WRITE64((u64)0); /* clientid */
2746                 WRITE32(0); /* length of owner name */
2747         }
2748         ADJUST_ARGS();
2749 }
2750
2751 static __be32
2752 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2753 {
2754         ENCODE_SEQID_OP_HEAD;
2755
2756         if (!nfserr)
2757                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2758         else if (nfserr == nfserr_denied)
2759                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2760
2761         encode_seqid_op_tail(resp, save, nfserr);
2762         return nfserr;
2763 }
2764
2765 static __be32
2766 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2767 {
2768         if (nfserr == nfserr_denied)
2769                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2770         return nfserr;
2771 }
2772
2773 static __be32
2774 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2775 {
2776         ENCODE_SEQID_OP_HEAD;
2777
2778         if (!nfserr)
2779                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2780
2781         encode_seqid_op_tail(resp, save, nfserr);
2782         return nfserr;
2783 }
2784
2785
2786 static __be32
2787 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2788 {
2789         __be32 *p;
2790
2791         if (!nfserr) {
2792                 RESERVE_SPACE(20);
2793                 write_cinfo(&p, &link->li_cinfo);
2794                 ADJUST_ARGS();
2795         }
2796         return nfserr;
2797 }
2798
2799
2800 static __be32
2801 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2802 {
2803         __be32 *p;
2804         ENCODE_SEQID_OP_HEAD;
2805
2806         if (nfserr)
2807                 goto out;
2808
2809         nfsd4_encode_stateid(resp, &open->op_stateid);
2810         RESERVE_SPACE(40);
2811         write_cinfo(&p, &open->op_cinfo);
2812         WRITE32(open->op_rflags);
2813         WRITE32(2);
2814         WRITE32(open->op_bmval[0]);
2815         WRITE32(open->op_bmval[1]);
2816         WRITE32(open->op_delegate_type);
2817         ADJUST_ARGS();
2818
2819         switch (open->op_delegate_type) {
2820         case NFS4_OPEN_DELEGATE_NONE:
2821                 break;
2822         case NFS4_OPEN_DELEGATE_READ:
2823                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2824                 RESERVE_SPACE(20);
2825                 WRITE32(open->op_recall);
2826
2827                 /*
2828                  * TODO: ACE's in delegations
2829                  */
2830                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2831                 WRITE32(0);
2832                 WRITE32(0);
2833                 WRITE32(0);   /* XXX: is NULL principal ok? */
2834                 ADJUST_ARGS();
2835                 break;
2836         case NFS4_OPEN_DELEGATE_WRITE:
2837                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2838                 RESERVE_SPACE(32);
2839                 WRITE32(0);
2840
2841                 /*
2842                  * TODO: space_limit's in delegations
2843                  */
2844                 WRITE32(NFS4_LIMIT_SIZE);
2845                 WRITE32(~(u32)0);
2846                 WRITE32(~(u32)0);
2847
2848                 /*
2849                  * TODO: ACE's in delegations
2850                  */
2851                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2852                 WRITE32(0);
2853                 WRITE32(0);
2854                 WRITE32(0);   /* XXX: is NULL principal ok? */
2855                 ADJUST_ARGS();
2856                 break;
2857         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2858                 switch (open->op_why_no_deleg) {
2859                 case WND4_CONTENTION:
2860                 case WND4_RESOURCE:
2861                         RESERVE_SPACE(8);
2862                         WRITE32(open->op_why_no_deleg);
2863                         WRITE32(0);     /* deleg signaling not supported yet */
2864                         break;
2865                 default:
2866                         RESERVE_SPACE(4);
2867                         WRITE32(open->op_why_no_deleg);
2868                 }
2869                 ADJUST_ARGS();
2870                 break;
2871         default:
2872                 BUG();
2873         }
2874         /* XXX save filehandle here */
2875 out:
2876         encode_seqid_op_tail(resp, save, nfserr);
2877         return nfserr;
2878 }
2879
2880 static __be32
2881 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2882 {
2883         ENCODE_SEQID_OP_HEAD;
2884
2885         if (!nfserr)
2886                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2887
2888         encode_seqid_op_tail(resp, save, nfserr);
2889         return nfserr;
2890 }
2891
2892 static __be32
2893 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2894 {
2895         ENCODE_SEQID_OP_HEAD;
2896
2897         if (!nfserr)
2898                 nfsd4_encode_stateid(resp, &od->od_stateid);
2899
2900         encode_seqid_op_tail(resp, save, nfserr);
2901         return nfserr;
2902 }
2903
2904 static __be32
2905 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2906                   struct nfsd4_read *read)
2907 {
2908         u32 eof;
2909         int v;
2910         struct page *page;
2911         unsigned long maxcount;
2912         long len;
2913         __be32 *p;
2914
2915         if (nfserr)
2916                 return nfserr;
2917         if (resp->xbuf->page_len)
2918                 return nfserr_resource;
2919
2920         RESERVE_SPACE(8); /* eof flag and byte count */
2921
2922         maxcount = svc_max_payload(resp->rqstp);
2923         if (maxcount > read->rd_length)
2924                 maxcount = read->rd_length;
2925
2926         len = maxcount;
2927         v = 0;
2928         while (len > 0) {
2929                 page = *(resp->rqstp->rq_next_page);
2930                 if (!page) { /* ran out of pages */
2931                         maxcount -= len;
2932                         break;
2933                 }
2934                 resp->rqstp->rq_vec[v].iov_base = page_address(page);
2935                 resp->rqstp->rq_vec[v].iov_len =
2936                         len < PAGE_SIZE ? len : PAGE_SIZE;
2937                 resp->rqstp->rq_next_page++;
2938                 v++;
2939                 len -= PAGE_SIZE;
2940         }
2941         read->rd_vlen = v;
2942
2943         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2944                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2945                         &maxcount);
2946
2947         if (nfserr)
2948                 return nfserr;
2949         eof = (read->rd_offset + maxcount >=
2950                read->rd_fhp->fh_dentry->d_inode->i_size);
2951
2952         WRITE32(eof);
2953         WRITE32(maxcount);
2954         ADJUST_ARGS();
2955         resp->xbuf->head[0].iov_len = (char*)p
2956                                         - (char*)resp->xbuf->head[0].iov_base;
2957         resp->xbuf->page_len = maxcount;
2958
2959         /* Use rest of head for padding and remaining ops: */
2960         resp->xbuf->tail[0].iov_base = p;
2961         resp->xbuf->tail[0].iov_len = 0;
2962         if (maxcount&3) {
2963                 RESERVE_SPACE(4);
2964                 WRITE32(0);
2965                 resp->xbuf->tail[0].iov_base += maxcount&3;
2966                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2967                 ADJUST_ARGS();
2968         }
2969         return 0;
2970 }
2971
2972 static __be32
2973 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2974 {
2975         int maxcount;
2976         char *page;
2977         __be32 *p;
2978
2979         if (nfserr)
2980                 return nfserr;
2981         if (resp->xbuf->page_len)
2982                 return nfserr_resource;
2983         if (!*resp->rqstp->rq_next_page)
2984                 return nfserr_resource;
2985
2986         page = page_address(*(resp->rqstp->rq_next_page++));
2987
2988         maxcount = PAGE_SIZE;
2989         RESERVE_SPACE(4);
2990
2991         /*
2992          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2993          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2994          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2995          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2996          */
2997         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2998         if (nfserr == nfserr_isdir)
2999                 return nfserr_inval;
3000         if (nfserr)
3001                 return nfserr;
3002
3003         WRITE32(maxcount);
3004         ADJUST_ARGS();
3005         resp->xbuf->head[0].iov_len = (char*)p
3006                                 - (char*)resp->xbuf->head[0].iov_base;
3007         resp->xbuf->page_len = maxcount;
3008
3009         /* Use rest of head for padding and remaining ops: */
3010         resp->xbuf->tail[0].iov_base = p;
3011         resp->xbuf->tail[0].iov_len = 0;
3012         if (maxcount&3) {
3013                 RESERVE_SPACE(4);
3014                 WRITE32(0);
3015                 resp->xbuf->tail[0].iov_base += maxcount&3;
3016                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3017                 ADJUST_ARGS();
3018         }
3019         return 0;
3020 }
3021
3022 static __be32
3023 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3024 {
3025         int maxcount;
3026         loff_t offset;
3027         __be32 *page, *savep, *tailbase;
3028         __be32 *p;
3029
3030         if (nfserr)
3031                 return nfserr;
3032         if (resp->xbuf->page_len)
3033                 return nfserr_resource;
3034         if (!*resp->rqstp->rq_next_page)
3035                 return nfserr_resource;
3036
3037         RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3038         savep = p;
3039
3040         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3041         WRITE32(0);
3042         WRITE32(0);
3043         ADJUST_ARGS();
3044         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3045         tailbase = p;
3046
3047         maxcount = PAGE_SIZE;
3048         if (maxcount > readdir->rd_maxcount)
3049                 maxcount = readdir->rd_maxcount;
3050
3051         /*
3052          * Convert from bytes to words, account for the two words already
3053          * written, make sure to leave two words at the end for the next
3054          * pointer and eof field.
3055          */
3056         maxcount = (maxcount >> 2) - 4;
3057         if (maxcount < 0) {
3058                 nfserr =  nfserr_toosmall;
3059                 goto err_no_verf;
3060         }
3061
3062         page = page_address(*(resp->rqstp->rq_next_page++));
3063         readdir->common.err = 0;
3064         readdir->buflen = maxcount;
3065         readdir->buffer = page;
3066         readdir->offset = NULL;
3067
3068         offset = readdir->rd_cookie;
3069         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3070                               &offset,
3071                               &readdir->common, nfsd4_encode_dirent);
3072         if (nfserr == nfs_ok &&
3073             readdir->common.err == nfserr_toosmall &&
3074             readdir->buffer == page)
3075                 nfserr = nfserr_toosmall;
3076         if (nfserr)
3077                 goto err_no_verf;
3078
3079         if (readdir->offset)
3080                 xdr_encode_hyper(readdir->offset, offset);
3081
3082         p = readdir->buffer;
3083         *p++ = 0;       /* no more entries */
3084         *p++ = htonl(readdir->common.err == nfserr_eof);
3085         resp->xbuf->page_len = ((char*)p) -
3086                 (char*)page_address(*(resp->rqstp->rq_next_page-1));
3087
3088         /* Use rest of head for padding and remaining ops: */
3089         resp->xbuf->tail[0].iov_base = tailbase;
3090         resp->xbuf->tail[0].iov_len = 0;
3091         resp->p = resp->xbuf->tail[0].iov_base;
3092         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3093
3094         return 0;
3095 err_no_verf:
3096         p = savep;
3097         ADJUST_ARGS();
3098         return nfserr;
3099 }
3100
3101 static __be32
3102 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3103 {
3104         __be32 *p;
3105
3106         if (!nfserr) {
3107                 RESERVE_SPACE(20);
3108                 write_cinfo(&p, &remove->rm_cinfo);
3109                 ADJUST_ARGS();
3110         }
3111         return nfserr;
3112 }
3113
3114 static __be32
3115 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3116 {
3117         __be32 *p;
3118
3119         if (!nfserr) {
3120                 RESERVE_SPACE(40);
3121                 write_cinfo(&p, &rename->rn_sinfo);
3122                 write_cinfo(&p, &rename->rn_tinfo);
3123                 ADJUST_ARGS();
3124         }
3125         return nfserr;
3126 }
3127
3128 static __be32
3129 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3130                          __be32 nfserr,struct svc_export *exp)
3131 {
3132         int i = 0;
3133         u32 nflavs;
3134         struct exp_flavor_info *flavs;
3135         struct exp_flavor_info def_flavs[2];
3136         __be32 *p;
3137
3138         if (nfserr)
3139                 goto out;
3140         if (exp->ex_nflavors) {
3141                 flavs = exp->ex_flavors;
3142                 nflavs = exp->ex_nflavors;
3143         } else { /* Handling of some defaults in absence of real secinfo: */
3144                 flavs = def_flavs;
3145                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3146                         nflavs = 2;
3147                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3148                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3149                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3150                         nflavs = 1;
3151                         flavs[0].pseudoflavor
3152                                         = svcauth_gss_flavor(exp->ex_client);
3153                 } else {
3154                         nflavs = 1;
3155                         flavs[0].pseudoflavor
3156                                         = exp->ex_client->flavour->flavour;
3157                 }
3158         }
3159
3160         RESERVE_SPACE(4);
3161         WRITE32(nflavs);
3162         ADJUST_ARGS();
3163         for (i = 0; i < nflavs; i++) {
3164                 u32 flav = flavs[i].pseudoflavor;
3165                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
3166
3167                 if (gm) {
3168                         RESERVE_SPACE(4);
3169                         WRITE32(RPC_AUTH_GSS);
3170                         ADJUST_ARGS();
3171                         RESERVE_SPACE(4 + gm->gm_oid.len);
3172                         WRITE32(gm->gm_oid.len);
3173                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
3174                         ADJUST_ARGS();
3175                         RESERVE_SPACE(4);
3176                         WRITE32(0); /* qop */
3177                         ADJUST_ARGS();
3178                         RESERVE_SPACE(4);
3179                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
3180                         ADJUST_ARGS();
3181                         gss_mech_put(gm);
3182                 } else {
3183                         RESERVE_SPACE(4);
3184                         WRITE32(flav);
3185                         ADJUST_ARGS();
3186                 }
3187         }
3188 out:
3189         if (exp)
3190                 exp_put(exp);
3191         return nfserr;
3192 }
3193
3194 static __be32
3195 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3196                      struct nfsd4_secinfo *secinfo)
3197 {
3198         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3199 }
3200
3201 static __be32
3202 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3203                      struct nfsd4_secinfo_no_name *secinfo)
3204 {
3205         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3206 }
3207
3208 /*
3209  * The SETATTR encode routine is special -- it always encodes a bitmap,
3210  * regardless of the error status.
3211  */
3212 static __be32
3213 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3214 {
3215         __be32 *p;
3216
3217         RESERVE_SPACE(12);
3218         if (nfserr) {
3219                 WRITE32(2);
3220                 WRITE32(0);
3221                 WRITE32(0);
3222         }
3223         else {
3224                 WRITE32(2);
3225                 WRITE32(setattr->sa_bmval[0]);
3226                 WRITE32(setattr->sa_bmval[1]);
3227         }
3228         ADJUST_ARGS();
3229         return nfserr;
3230 }
3231
3232 static __be32
3233 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3234 {
3235         __be32 *p;
3236
3237         if (!nfserr) {
3238                 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3239                 WRITEMEM(&scd->se_clientid, 8);
3240                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3241                 ADJUST_ARGS();
3242         }
3243         else if (nfserr == nfserr_clid_inuse) {
3244                 RESERVE_SPACE(8);
3245                 WRITE32(0);
3246                 WRITE32(0);
3247                 ADJUST_ARGS();
3248         }
3249         return nfserr;
3250 }
3251
3252 static __be32
3253 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3254 {
3255         __be32 *p;
3256
3257         if (!nfserr) {
3258                 RESERVE_SPACE(16);
3259                 WRITE32(write->wr_bytes_written);
3260                 WRITE32(write->wr_how_written);
3261                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3262                 ADJUST_ARGS();
3263         }
3264         return nfserr;
3265 }
3266
3267 static __be32
3268 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3269                          struct nfsd4_exchange_id *exid)
3270 {
3271         __be32 *p;
3272         char *major_id;
3273         char *server_scope;
3274         int major_id_sz;
3275         int server_scope_sz;
3276         uint64_t minor_id = 0;
3277
3278         if (nfserr)
3279                 return nfserr;
3280
3281         major_id = utsname()->nodename;
3282         major_id_sz = strlen(major_id);
3283         server_scope = utsname()->nodename;
3284         server_scope_sz = strlen(server_scope);
3285
3286         RESERVE_SPACE(
3287                 8 /* eir_clientid */ +
3288                 4 /* eir_sequenceid */ +
3289                 4 /* eir_flags */ +
3290                 4 /* spr_how (SP4_NONE) */ +
3291                 8 /* so_minor_id */ +
3292                 4 /* so_major_id.len */ +
3293                 (XDR_QUADLEN(major_id_sz) * 4) +
3294                 4 /* eir_server_scope.len */ +
3295                 (XDR_QUADLEN(server_scope_sz) * 4) +
3296                 4 /* eir_server_impl_id.count (0) */);
3297
3298         WRITEMEM(&exid->clientid, 8);
3299         WRITE32(exid->seqid);
3300         WRITE32(exid->flags);
3301
3302         /* state_protect4_r. Currently only support SP4_NONE */
3303         BUG_ON(exid->spa_how != SP4_NONE);
3304         WRITE32(exid->spa_how);
3305
3306         /* The server_owner struct */
3307         WRITE64(minor_id);      /* Minor id */
3308         /* major id */
3309         WRITE32(major_id_sz);
3310         WRITEMEM(major_id, major_id_sz);
3311
3312         /* Server scope */
3313         WRITE32(server_scope_sz);
3314         WRITEMEM(server_scope, server_scope_sz);
3315
3316         /* Implementation id */
3317         WRITE32(0);     /* zero length nfs_impl_id4 array */
3318         ADJUST_ARGS();
3319         return 0;
3320 }
3321
3322 static __be32
3323 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3324                             struct nfsd4_create_session *sess)
3325 {
3326         __be32 *p;
3327
3328         if (nfserr)
3329                 return nfserr;
3330
3331         RESERVE_SPACE(24);
3332         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3333         WRITE32(sess->seqid);
3334         WRITE32(sess->flags);
3335         ADJUST_ARGS();
3336
3337         RESERVE_SPACE(28);
3338         WRITE32(0); /* headerpadsz */
3339         WRITE32(sess->fore_channel.maxreq_sz);
3340         WRITE32(sess->fore_channel.maxresp_sz);
3341         WRITE32(sess->fore_channel.maxresp_cached);
3342         WRITE32(sess->fore_channel.maxops);
3343         WRITE32(sess->fore_channel.maxreqs);
3344         WRITE32(sess->fore_channel.nr_rdma_attrs);
3345         ADJUST_ARGS();
3346
3347         if (sess->fore_channel.nr_rdma_attrs) {
3348                 RESERVE_SPACE(4);
3349                 WRITE32(sess->fore_channel.rdma_attrs);
3350                 ADJUST_ARGS();
3351         }
3352
3353         RESERVE_SPACE(28);
3354         WRITE32(0); /* headerpadsz */
3355         WRITE32(sess->back_channel.maxreq_sz);
3356         WRITE32(sess->back_channel.maxresp_sz);
3357         WRITE32(sess->back_channel.maxresp_cached);
3358         WRITE32(sess->back_channel.maxops);
3359         WRITE32(sess->back_channel.maxreqs);
3360         WRITE32(sess->back_channel.nr_rdma_attrs);
3361         ADJUST_ARGS();
3362
3363         if (sess->back_channel.nr_rdma_attrs) {
3364                 RESERVE_SPACE(4);
3365                 WRITE32(sess->back_channel.rdma_attrs);
3366                 ADJUST_ARGS();
3367         }
3368         return 0;
3369 }
3370
3371 static __be32
3372 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3373                              struct nfsd4_destroy_session *destroy_session)
3374 {
3375         return nfserr;
3376 }
3377
3378 static __be32
3379 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3380                           struct nfsd4_free_stateid *free_stateid)
3381 {
3382         __be32 *p;
3383
3384         if (nfserr)
3385                 return nfserr;
3386
3387         RESERVE_SPACE(4);
3388         *p++ = nfserr;
3389         ADJUST_ARGS();
3390         return nfserr;
3391 }
3392
3393 static __be32
3394 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3395                       struct nfsd4_sequence *seq)
3396 {
3397         __be32 *p;
3398
3399         if (nfserr)
3400                 return nfserr;
3401
3402         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3403         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3404         WRITE32(seq->seqid);
3405         WRITE32(seq->slotid);
3406         /* Note slotid's are numbered from zero: */
3407         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3408         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3409         WRITE32(seq->status_flags);
3410
3411         ADJUST_ARGS();
3412         resp->cstate.datap = p; /* DRC cache data pointer */
3413         return 0;
3414 }
3415
3416 static __be32
3417 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3418                           struct nfsd4_test_stateid *test_stateid)
3419 {
3420         struct nfsd4_test_stateid_id *stateid, *next;
3421         __be32 *p;
3422
3423         RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3424         *p++ = htonl(test_stateid->ts_num_ids);
3425
3426         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3427                 *p++ = stateid->ts_id_status;
3428         }
3429
3430         ADJUST_ARGS();
3431         return nfserr;
3432 }
3433
3434 static __be32
3435 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3436 {
3437         return nfserr;
3438 }
3439
3440 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3441
3442 /*
3443  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3444  * since we don't need to filter out obsolete ops as this is
3445  * done in the decoding phase.
3446  */
3447 static nfsd4_enc nfsd4_enc_ops[] = {
3448         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3449         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3450         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3451         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3452         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3453         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3454         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3455         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3456         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3457         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3458         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3459         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3460         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3461         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3462         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3463         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3464         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3465         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3466         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3467         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3468         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3469         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3470         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3471         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3472         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3473         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3474         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3475         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3476         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3477         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3478         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3479         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3480         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3481         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3482         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3483         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3484         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3485
3486         /* NFSv4.1 operations */
3487         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3488         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3489         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3490         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3491         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3492         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3493         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3494         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3495         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3496         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3497         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3498         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3499         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3500         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3501         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3502         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3503         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3504         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3505         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3506 };
3507
3508 /*
3509  * Calculate the total amount of memory that the compound response has taken
3510  * after encoding the current operation with pad.
3511  *
3512  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3513  *      which was specified at nfsd4_operation, else pad is zero.
3514  *
3515  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3516  *
3517  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3518  * will be at least a page and will therefore hold the xdr_buf head.
3519  */
3520 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3521 {
3522         struct xdr_buf *xb = &resp->rqstp->rq_res;
3523         struct nfsd4_session *session = NULL;
3524         struct nfsd4_slot *slot = resp->cstate.slot;
3525         u32 length, tlen = 0;
3526
3527         if (!nfsd4_has_session(&resp->cstate))
3528                 return 0;
3529
3530         session = resp->cstate.session;
3531         if (session == NULL)
3532                 return 0;
3533
3534         if (xb->page_len == 0) {
3535                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3536         } else {
3537                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3538                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3539
3540                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3541         }
3542         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3543                 length, xb->page_len, tlen, pad);
3544
3545         if (length > session->se_fchannel.maxresp_sz)
3546                 return nfserr_rep_too_big;
3547
3548         if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3549             length > session->se_fchannel.maxresp_cached)
3550                 return nfserr_rep_too_big_to_cache;
3551
3552         return 0;
3553 }
3554
3555 void
3556 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3557 {
3558         __be32 *statp;
3559         __be32 *p;
3560
3561         RESERVE_SPACE(8);
3562         WRITE32(op->opnum);
3563         statp = p++;    /* to be backfilled at the end */
3564         ADJUST_ARGS();
3565
3566         if (op->opnum == OP_ILLEGAL)
3567                 goto status;
3568         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3569                !nfsd4_enc_ops[op->opnum]);
3570         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3571         /* nfsd4_check_drc_limit guarantees enough room for error status */
3572         if (!op->status)
3573                 op->status = nfsd4_check_resp_size(resp, 0);
3574 status:
3575         /*
3576          * Note: We write the status directly, instead of using WRITE32(),
3577          * since it is already in network byte order.
3578          */
3579         *statp = op->status;
3580 }
3581
3582 /*
3583  * Encode the reply stored in the stateowner reply cache
3584  *
3585  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3586  * previously sent already encoded operation.
3587  *
3588  * called with nfs4_lock_state() held
3589  */
3590 void
3591 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3592 {
3593         __be32 *p;
3594         struct nfs4_replay *rp = op->replay;
3595
3596         BUG_ON(!rp);
3597
3598         RESERVE_SPACE(8);
3599         WRITE32(op->opnum);
3600         *p++ = rp->rp_status;  /* already xdr'ed */
3601         ADJUST_ARGS();
3602
3603         RESERVE_SPACE(rp->rp_buflen);
3604         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3605         ADJUST_ARGS();
3606 }
3607
3608 int
3609 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3610 {
3611         return xdr_ressize_check(rqstp, p);
3612 }
3613
3614 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3615 {
3616         struct svc_rqst *rqstp = rq;
3617         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3618
3619         if (args->ops != args->iops) {
3620                 kfree(args->ops);
3621                 args->ops = args->iops;
3622         }
3623         kfree(args->tmpp);
3624         args->tmpp = NULL;
3625         while (args->to_free) {
3626                 struct tmpbuf *tb = args->to_free;
3627                 args->to_free = tb->next;
3628                 tb->release(tb->buf);
3629                 kfree(tb);
3630         }
3631         return 1;
3632 }
3633
3634 int
3635 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3636 {
3637         args->p = p;
3638         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3639         args->pagelist = rqstp->rq_arg.pages;
3640         args->pagelen = rqstp->rq_arg.page_len;
3641         args->tmpp = NULL;
3642         args->to_free = NULL;
3643         args->ops = args->iops;
3644         args->rqstp = rqstp;
3645
3646         return !nfsd4_decode_compound(args);
3647 }
3648
3649 int
3650 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3651 {
3652         /*
3653          * All that remains is to write the tag and operation count...
3654          */
3655         struct nfsd4_compound_state *cs = &resp->cstate;
3656         struct kvec *iov;
3657         p = resp->tagp;
3658         *p++ = htonl(resp->taglen);
3659         memcpy(p, resp->tag, resp->taglen);
3660         p += XDR_QUADLEN(resp->taglen);
3661         *p++ = htonl(resp->opcnt);
3662
3663         if (rqstp->rq_res.page_len)
3664                 iov = &rqstp->rq_res.tail[0];
3665         else
3666                 iov = &rqstp->rq_res.head[0];
3667         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3668         BUG_ON(iov->iov_len > PAGE_SIZE);
3669         if (nfsd4_has_session(cs)) {
3670                 if (cs->status != nfserr_replay_cache) {
3671                         nfsd4_store_cache_entry(resp);
3672                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3673                 }
3674                 /* Renew the clientid on success and on replay */
3675                 release_session_client(cs->session);
3676                 nfsd4_put_session(cs->session);
3677         }
3678         return 1;
3679 }
3680
3681 /*
3682  * Local variables:
3683  *  c-basic-offset: 8
3684  * End:
3685  */