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
  57 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  58
  59 /*
  60  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  61  * directory in order to indicate to the client that a filesystem boundary is present
  62  * We use a fixed fsid for a referral
  63  */
  64 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  65 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  66
  67 static __be32
  68 check_filename(char *str, int len, __be32 err)
  69 {
  70         int i;
  71
  72         if (len == 0)
  73                 return nfserr_inval;
  74         if (isdotent(str, len))
  75                 return err;
  76         for (i = 0; i < len; i++)
  77                 if (str[i] == '/')
  78                         return err;
  79         return 0;
  80 }
  81
  82 #define DECODE_HEAD                             \
  83         __be32 *p;                              \
  84         __be32 status
  85 #define DECODE_TAIL                             \
  86         status = 0;                             \
  87 out:                                            \
  88         return status;                          \
  89 xdr_error:                                      \
  90         dprintk("NFSD: xdr error (%s:%d)\n",    \
  91                         __FILE__, __LINE__);    \
  92         status = nfserr_bad_xdr;                \
  93         goto out
  94
  95 #define READ32(x)         (x) = ntohl(*p++)
  96 #define READ64(x)         do {                  \
  97         (x) = (u64)ntohl(*p++) << 32;           \
  98         (x) |= ntohl(*p++);                     \
  99 } while (0)
 100 #define READTIME(x)       do {                  \
 101         p++;                                    \
 102         (x) = ntohl(*p++);                      \
 103         p++;                                    \
 104 } while (0)
 105 #define READMEM(x,nbytes) do {                  \
 106         x = (char *)p;                          \
 107         p += XDR_QUADLEN(nbytes);               \
 108 } while (0)
 109 #define SAVEMEM(x,nbytes) do {                  \
 110         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 111                 savemem(argp, p, nbytes) :      \
 112                 (char *)p)) {                   \
 113                 dprintk("NFSD: xdr error (%s:%d)\n", \
 114                                 __FILE__, __LINE__); \
 115                 goto xdr_error;                 \
 116                 }                               \
 117         p += XDR_QUADLEN(nbytes);               \
 118 } while (0)
 119 #define COPYMEM(x,nbytes) do {                  \
 120         memcpy((x), p, nbytes);                 \
 121         p += XDR_QUADLEN(nbytes);               \
 122 } while (0)
 123
 124 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 125 #define READ_BUF(nbytes)  do {                  \
 126         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 127                 p = argp->p;                    \
 128                 argp->p += XDR_QUADLEN(nbytes); \
 129         } else if (!(p = read_buf(argp, nbytes))) { \
 130                 dprintk("NFSD: xdr error (%s:%d)\n", \
 131                                 __FILE__, __LINE__); \
 132                 goto xdr_error;                 \
 133         }                                       \
 134 } while (0)
 135
 136 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 137 {
 138         /* We want more bytes than seem to be available.
 139          * Maybe we need a new page, maybe we have just run out
 140          */
 141         unsigned int avail = (char *)argp->end - (char *)argp->p;
 142         __be32 *p;
 143         if (avail + argp->pagelen < nbytes)
 144                 return NULL;
 145         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 146                 return NULL;
 147         /* ok, we can do it with the current plus the next page */
 148         if (nbytes <= sizeof(argp->tmp))
 149                 p = argp->tmp;
 150         else {
 151                 kfree(argp->tmpp);
 152                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 153                 if (!p)
 154                         return NULL;
 155
 156         }
 157         /*
 158          * The following memcpy is safe because read_buf is always
 159          * called with nbytes > avail, and the two cases above both
 160          * guarantee p points to at least nbytes bytes.
 161          */
 162         memcpy(p, argp->p, avail);
 163         /* step to next page */
 164         argp->p = page_address(argp->pagelist[0]);
 165         argp->pagelist++;
 166         if (argp->pagelen < PAGE_SIZE) {
 167                 argp->end = argp->p + (argp->pagelen>>2);
 168                 argp->pagelen = 0;
 169         } else {
 170                 argp->end = argp->p + (PAGE_SIZE>>2);
 171                 argp->pagelen -= PAGE_SIZE;
 172         }
 173         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 174         argp->p += XDR_QUADLEN(nbytes - avail);
 175         return p;
 176 }
 177
 178 static int zero_clientid(clientid_t *clid)
 179 {
 180         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 181 }
 182
 183 static int
 184 defer_free(struct nfsd4_compoundargs *argp,
 185                 void (*release)(const void *), void *p)
 186 {
 187         struct tmpbuf *tb;
 188
 189         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 190         if (!tb)
 191                 return -ENOMEM;
 192         tb->buf = p;
 193         tb->release = release;
 194         tb->next = argp->to_free;
 195         argp->to_free = tb;
 196         return 0;
 197 }
 198
 199 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 200 {
 201         if (p == argp->tmp) {
 202                 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
 203                 if (!p)
 204                         return NULL;
 205         } else {
 206                 BUG_ON(p != argp->tmpp);
 207                 argp->tmpp = NULL;
 208         }
 209         if (defer_free(argp, kfree, p)) {
 210                 kfree(p);
 211                 return NULL;
 212         } else
 213                 return (char *)p;
 214 }
 215
 216 static __be32
 217 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 218 {
 219         u32 bmlen;
 220         DECODE_HEAD;
 221
 222         bmval[0] = 0;
 223         bmval[1] = 0;
 224         bmval[2] = 0;
 225
 226         READ_BUF(4);
 227         READ32(bmlen);
 228         if (bmlen > 1000)
 229                 goto xdr_error;
 230
 231         READ_BUF(bmlen << 2);
 232         if (bmlen > 0)
 233                 READ32(bmval[0]);
 234         if (bmlen > 1)
 235                 READ32(bmval[1]);
 236         if (bmlen > 2)
 237                 READ32(bmval[2]);
 238
 239         DECODE_TAIL;
 240 }
 241
 242 static __be32
 243 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 244                    struct iattr *iattr, struct nfs4_acl **acl)
 245 {
 246         int expected_len, len = 0;
 247         u32 dummy32;
 248         char *buf;
 249         int host_err;
 250
 251         DECODE_HEAD;
 252         iattr->ia_valid = 0;
 253         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 254                 return status;
 255
 256         READ_BUF(4);
 257         READ32(expected_len);
 258
 259         if (bmval[0] & FATTR4_WORD0_SIZE) {
 260                 READ_BUF(8);
 261                 len += 8;
 262                 READ64(iattr->ia_size);
 263                 iattr->ia_valid |= ATTR_SIZE;
 264         }
 265         if (bmval[0] & FATTR4_WORD0_ACL) {
 266                 int nace;
 267                 struct nfs4_ace *ace;
 268
 269                 READ_BUF(4); len += 4;
 270                 READ32(nace);
 271
 272                 if (nace > NFS4_ACL_MAX)
 273                         return nfserr_resource;
 274
 275                 *acl = nfs4_acl_new(nace);
 276                 if (*acl == NULL) {
 277                         host_err = -ENOMEM;
 278                         goto out_nfserr;
 279                 }
 280                 defer_free(argp, kfree, *acl);
 281
 282                 (*acl)->naces = nace;
 283                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 284                         READ_BUF(16); len += 16;
 285                         READ32(ace->type);
 286                         READ32(ace->flag);
 287                         READ32(ace->access_mask);
 288                         READ32(dummy32);
 289                         READ_BUF(dummy32);
 290                         len += XDR_QUADLEN(dummy32) << 2;
 291                         READMEM(buf, dummy32);
 292                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 293                         status = nfs_ok;
 294                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 295                                 ace->who = 0;
 296                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 297                                 status = nfsd_map_name_to_gid(argp->rqstp,
 298                                                 buf, dummy32, &ace->who);
 299                         else
 300                                 status = nfsd_map_name_to_uid(argp->rqstp,
 301                                                 buf, dummy32, &ace->who);
 302                         if (status)
 303                                 return status;
 304                 }
 305         } else
 306                 *acl = NULL;
 307         if (bmval[1] & FATTR4_WORD1_MODE) {
 308                 READ_BUF(4);
 309                 len += 4;
 310                 READ32(iattr->ia_mode);
 311                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 312                 iattr->ia_valid |= ATTR_MODE;
 313         }
 314         if (bmval[1] & FATTR4_WORD1_OWNER) {
 315                 READ_BUF(4);
 316                 len += 4;
 317                 READ32(dummy32);
 318                 READ_BUF(dummy32);
 319                 len += (XDR_QUADLEN(dummy32) << 2);
 320                 READMEM(buf, dummy32);
 321                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 322                         return status;
 323                 iattr->ia_valid |= ATTR_UID;
 324         }
 325         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 326                 READ_BUF(4);
 327                 len += 4;
 328                 READ32(dummy32);
 329                 READ_BUF(dummy32);
 330                 len += (XDR_QUADLEN(dummy32) << 2);
 331                 READMEM(buf, dummy32);
 332                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 333                         return status;
 334                 iattr->ia_valid |= ATTR_GID;
 335         }
 336         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 337                 READ_BUF(4);
 338                 len += 4;
 339                 READ32(dummy32);
 340                 switch (dummy32) {
 341                 case NFS4_SET_TO_CLIENT_TIME:
 342                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 343                            all 32 bits of 'nseconds'. */
 344                         READ_BUF(12);
 345                         len += 12;
 346                         READ32(dummy32);
 347                         if (dummy32)
 348                                 return nfserr_inval;
 349                         READ32(iattr->ia_atime.tv_sec);
 350                         READ32(iattr->ia_atime.tv_nsec);
 351                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 352                                 return nfserr_inval;
 353                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 354                         break;
 355                 case NFS4_SET_TO_SERVER_TIME:
 356                         iattr->ia_valid |= ATTR_ATIME;
 357                         break;
 358                 default:
 359                         goto xdr_error;
 360                 }
 361         }
 362         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 363                 READ_BUF(4);
 364                 len += 4;
 365                 READ32(dummy32);
 366                 switch (dummy32) {
 367                 case NFS4_SET_TO_CLIENT_TIME:
 368                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 369                            all 32 bits of 'nseconds'. */
 370                         READ_BUF(12);
 371                         len += 12;
 372                         READ32(dummy32);
 373                         if (dummy32)
 374                                 return nfserr_inval;
 375                         READ32(iattr->ia_mtime.tv_sec);
 376                         READ32(iattr->ia_mtime.tv_nsec);
 377                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 378                                 return nfserr_inval;
 379                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 380                         break;
 381                 case NFS4_SET_TO_SERVER_TIME:
 382                         iattr->ia_valid |= ATTR_MTIME;
 383                         break;
 384                 default:
 385                         goto xdr_error;
 386                 }
 387         }
 388         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 389             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 390             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 391                 READ_BUF(expected_len - len);
 392         else if (len != expected_len)
 393                 goto xdr_error;
 394
 395         DECODE_TAIL;
 396
 397 out_nfserr:
 398         status = nfserrno(host_err);
 399         goto out;
 400 }
 401
 402 static __be32
 403 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 404 {
 405         DECODE_HEAD;
 406
 407         READ_BUF(sizeof(stateid_t));
 408         READ32(sid->si_generation);
 409         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 410
 411         DECODE_TAIL;
 412 }
 413
 414 static __be32
 415 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 416 {
 417         DECODE_HEAD;
 418
 419         READ_BUF(4);
 420         READ32(access->ac_req_access);
 421
 422         DECODE_TAIL;
 423 }
 424
 425 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 426 {
 427         DECODE_HEAD;
 428         u32 dummy, uid, gid;
 429         char *machine_name;
 430         int i;
 431         int nr_secflavs;
 432
 433         /* callback_sec_params4 */
 434         READ_BUF(4);
 435         READ32(nr_secflavs);
 436         cbs->flavor = (u32)(-1);
 437         for (i = 0; i < nr_secflavs; ++i) {
 438                 READ_BUF(4);
 439                 READ32(dummy);
 440                 switch (dummy) {
 441                 case RPC_AUTH_NULL:
 442                         /* Nothing to read */
 443                         if (cbs->flavor == (u32)(-1))
 444                                 cbs->flavor = RPC_AUTH_NULL;
 445                         break;
 446                 case RPC_AUTH_UNIX:
 447                         READ_BUF(8);
 448                         /* stamp */
 449                         READ32(dummy);
 450
 451                         /* machine name */
 452                         READ32(dummy);
 453                         READ_BUF(dummy);
 454                         SAVEMEM(machine_name, dummy);
 455
 456                         /* uid, gid */
 457                         READ_BUF(8);
 458                         READ32(uid);
 459                         READ32(gid);
 460
 461                         /* more gids */
 462                         READ_BUF(4);
 463                         READ32(dummy);
 464                         READ_BUF(dummy * 4);
 465                         if (cbs->flavor == (u32)(-1)) {
 466                                 cbs->uid = uid;
 467                                 cbs->gid = gid;
 468                                 cbs->flavor = RPC_AUTH_UNIX;
 469                         }
 470                         break;
 471                 case RPC_AUTH_GSS:
 472                         dprintk("RPC_AUTH_GSS callback secflavor "
 473                                 "not supported!\n");
 474                         READ_BUF(8);
 475                         /* gcbp_service */
 476                         READ32(dummy);
 477                         /* gcbp_handle_from_server */
 478                         READ32(dummy);
 479                         READ_BUF(dummy);
 480                         p += XDR_QUADLEN(dummy);
 481                         /* gcbp_handle_from_client */
 482                         READ_BUF(4);
 483                         READ32(dummy);
 484                         READ_BUF(dummy);
 485                         break;
 486                 default:
 487                         dprintk("Illegal callback secflavor\n");
 488                         return nfserr_inval;
 489                 }
 490         }
 491         DECODE_TAIL;
 492 }
 493
 494 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 495 {
 496         DECODE_HEAD;
 497
 498         READ_BUF(4);
 499         READ32(bc->bc_cb_program);
 500         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 501
 502         DECODE_TAIL;
 503 }
 504
 505 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 506 {
 507         DECODE_HEAD;
 508
 509         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 510         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 511         READ32(bcts->dir);
 512         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 513          * could help us figure out we should be using it. */
 514         DECODE_TAIL;
 515 }
 516
 517 static __be32
 518 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 519 {
 520         DECODE_HEAD;
 521
 522         READ_BUF(4);
 523         READ32(close->cl_seqid);
 524         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 525
 526         DECODE_TAIL;
 527 }
 528
 529
 530 static __be32
 531 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 532 {
 533         DECODE_HEAD;
 534
 535         READ_BUF(12);
 536         READ64(commit->co_offset);
 537         READ32(commit->co_count);
 538
 539         DECODE_TAIL;
 540 }
 541
 542 static __be32
 543 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 544 {
 545         DECODE_HEAD;
 546
 547         READ_BUF(4);
 548         READ32(create->cr_type);
 549         switch (create->cr_type) {
 550         case NF4LNK:
 551                 READ_BUF(4);
 552                 READ32(create->cr_linklen);
 553                 READ_BUF(create->cr_linklen);
 554                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 555                 break;
 556         case NF4BLK:
 557         case NF4CHR:
 558                 READ_BUF(8);
 559                 READ32(create->cr_specdata1);
 560                 READ32(create->cr_specdata2);
 561                 break;
 562         case NF4SOCK:
 563         case NF4FIFO:
 564         case NF4DIR:
 565         default:
 566                 break;
 567         }
 568
 569         READ_BUF(4);
 570         READ32(create->cr_namelen);
 571         READ_BUF(create->cr_namelen);
 572         SAVEMEM(create->cr_name, create->cr_namelen);
 573         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 574                 return status;
 575
 576         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 577                                     &create->cr_acl);
 578         if (status)
 579                 goto out;
 580
 581         DECODE_TAIL;
 582 }
 583
 584 static inline __be32
 585 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 586 {
 587         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 588 }
 589
 590 static inline __be32
 591 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 592 {
 593         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 594 }
 595
 596 static __be32
 597 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 598 {
 599         DECODE_HEAD;
 600
 601         READ_BUF(4);
 602         READ32(link->li_namelen);
 603         READ_BUF(link->li_namelen);
 604         SAVEMEM(link->li_name, link->li_namelen);
 605         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 606                 return status;
 607
 608         DECODE_TAIL;
 609 }
 610
 611 static __be32
 612 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 613 {
 614         DECODE_HEAD;
 615
 616         /*
 617         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 618         */
 619         READ_BUF(28);
 620         READ32(lock->lk_type);
 621         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 622                 goto xdr_error;
 623         READ32(lock->lk_reclaim);
 624         READ64(lock->lk_offset);
 625         READ64(lock->lk_length);
 626         READ32(lock->lk_is_new);
 627
 628         if (lock->lk_is_new) {
 629                 READ_BUF(4);
 630                 READ32(lock->lk_new_open_seqid);
 631                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 632                 if (status)
 633                         return status;
 634                 READ_BUF(8 + sizeof(clientid_t));
 635                 READ32(lock->lk_new_lock_seqid);
 636                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 637                 READ32(lock->lk_new_owner.len);
 638                 READ_BUF(lock->lk_new_owner.len);
 639                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 640         } else {
 641                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 642                 if (status)
 643                         return status;
 644                 READ_BUF(4);
 645                 READ32(lock->lk_old_lock_seqid);
 646         }
 647
 648         DECODE_TAIL;
 649 }
 650
 651 static __be32
 652 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 653 {
 654         DECODE_HEAD;
 655
 656         READ_BUF(32);
 657         READ32(lockt->lt_type);
 658         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 659                 goto xdr_error;
 660         READ64(lockt->lt_offset);
 661         READ64(lockt->lt_length);
 662         COPYMEM(&lockt->lt_clientid, 8);
 663         READ32(lockt->lt_owner.len);
 664         READ_BUF(lockt->lt_owner.len);
 665         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 666
 667         DECODE_TAIL;
 668 }
 669
 670 static __be32
 671 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 672 {
 673         DECODE_HEAD;
 674
 675         READ_BUF(8);
 676         READ32(locku->lu_type);
 677         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 678                 goto xdr_error;
 679         READ32(locku->lu_seqid);
 680         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 681         if (status)
 682                 return status;
 683         READ_BUF(16);
 684         READ64(locku->lu_offset);
 685         READ64(locku->lu_length);
 686
 687         DECODE_TAIL;
 688 }
 689
 690 static __be32
 691 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 692 {
 693         DECODE_HEAD;
 694
 695         READ_BUF(4);
 696         READ32(lookup->lo_len);
 697         READ_BUF(lookup->lo_len);
 698         SAVEMEM(lookup->lo_name, lookup->lo_len);
 699         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 700                 return status;
 701
 702         DECODE_TAIL;
 703 }
 704
 705 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 706 {
 707         __be32 *p;
 708         u32 w;
 709
 710         READ_BUF(4);
 711         READ32(w);
 712         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 713         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 714         if (deleg_when)
 715                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 716
 717         switch (w & NFS4_SHARE_ACCESS_MASK) {
 718         case NFS4_SHARE_ACCESS_READ:
 719         case NFS4_SHARE_ACCESS_WRITE:
 720         case NFS4_SHARE_ACCESS_BOTH:
 721                 break;
 722         default:
 723                 return nfserr_bad_xdr;
 724         }
 725         w &= ~NFS4_SHARE_ACCESS_MASK;
 726         if (!w)
 727                 return nfs_ok;
 728         if (!argp->minorversion)
 729                 return nfserr_bad_xdr;
 730         switch (w & NFS4_SHARE_WANT_MASK) {
 731         case NFS4_SHARE_WANT_NO_PREFERENCE:
 732         case NFS4_SHARE_WANT_READ_DELEG:
 733         case NFS4_SHARE_WANT_WRITE_DELEG:
 734         case NFS4_SHARE_WANT_ANY_DELEG:
 735         case NFS4_SHARE_WANT_NO_DELEG:
 736         case NFS4_SHARE_WANT_CANCEL:
 737                 break;
 738         default:
 739                 return nfserr_bad_xdr;
 740         }
 741         w &= ~NFS4_SHARE_WANT_MASK;
 742         if (!w)
 743                 return nfs_ok;
 744
 745         if (!deleg_when)        /* open_downgrade */
 746                 return nfserr_inval;
 747         switch (w) {
 748         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 749         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 750         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 751               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 752                 return nfs_ok;
 753         }
 754 xdr_error:
 755         return nfserr_bad_xdr;
 756 }
 757
 758 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 759 {
 760         __be32 *p;
 761
 762         READ_BUF(4);
 763         READ32(*x);
 764         /* Note: unlinke access bits, deny bits may be zero. */
 765         if (*x & ~NFS4_SHARE_DENY_BOTH)
 766                 return nfserr_bad_xdr;
 767         return nfs_ok;
 768 xdr_error:
 769         return nfserr_bad_xdr;
 770 }
 771
 772 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 773 {
 774         __be32 *p;
 775
 776         READ_BUF(4);
 777         READ32(o->len);
 778
 779         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 780                 return nfserr_bad_xdr;
 781
 782         READ_BUF(o->len);
 783         SAVEMEM(o->data, o->len);
 784         return nfs_ok;
 785 xdr_error:
 786         return nfserr_bad_xdr;
 787 }
 788
 789 static __be32
 790 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 791 {
 792         DECODE_HEAD;
 793         u32 dummy;
 794
 795         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 796         open->op_iattr.ia_valid = 0;
 797         open->op_openowner = NULL;
 798
 799         /* seqid, share_access, share_deny, clientid, ownerlen */
 800         READ_BUF(4);
 801         READ32(open->op_seqid);
 802         /* decode, yet ignore deleg_when until supported */
 803         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 804                                            &open->op_deleg_want, &dummy);
 805         if (status)
 806                 goto xdr_error;
 807         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 808         if (status)
 809                 goto xdr_error;
 810         READ_BUF(sizeof(clientid_t));
 811         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 812         status = nfsd4_decode_opaque(argp, &open->op_owner);
 813         if (status)
 814                 goto xdr_error;
 815         READ_BUF(4);
 816         READ32(open->op_create);
 817         switch (open->op_create) {
 818         case NFS4_OPEN_NOCREATE:
 819                 break;
 820         case NFS4_OPEN_CREATE:
 821                 READ_BUF(4);
 822                 READ32(open->op_createmode);
 823                 switch (open->op_createmode) {
 824                 case NFS4_CREATE_UNCHECKED:
 825                 case NFS4_CREATE_GUARDED:
 826                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 827                                 &open->op_iattr, &open->op_acl);
 828                         if (status)
 829                                 goto out;
 830                         break;
 831                 case NFS4_CREATE_EXCLUSIVE:
 832                         READ_BUF(NFS4_VERIFIER_SIZE);
 833                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 834                         break;
 835                 case NFS4_CREATE_EXCLUSIVE4_1:
 836                         if (argp->minorversion < 1)
 837                                 goto xdr_error;
 838                         READ_BUF(NFS4_VERIFIER_SIZE);
 839                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 840                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 841                                 &open->op_iattr, &open->op_acl);
 842                         if (status)
 843                                 goto out;
 844                         break;
 845                 default:
 846                         goto xdr_error;
 847                 }
 848                 break;
 849         default:
 850                 goto xdr_error;
 851         }
 852
 853         /* open_claim */
 854         READ_BUF(4);
 855         READ32(open->op_claim_type);
 856         switch (open->op_claim_type) {
 857         case NFS4_OPEN_CLAIM_NULL:
 858         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 859                 READ_BUF(4);
 860                 READ32(open->op_fname.len);
 861                 READ_BUF(open->op_fname.len);
 862                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 863                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 864                         return status;
 865                 break;
 866         case NFS4_OPEN_CLAIM_PREVIOUS:
 867                 READ_BUF(4);
 868                 READ32(open->op_delegate_type);
 869                 break;
 870         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 871                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 872                 if (status)
 873                         return status;
 874                 READ_BUF(4);
 875                 READ32(open->op_fname.len);
 876                 READ_BUF(open->op_fname.len);
 877                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 878                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 879                         return status;
 880                 break;
 881         case NFS4_OPEN_CLAIM_FH:
 882         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 883                 if (argp->minorversion < 1)
 884                         goto xdr_error;
 885                 /* void */
 886                 break;
 887         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 888                 if (argp->minorversion < 1)
 889                         goto xdr_error;
 890                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 891                 if (status)
 892                         return status;
 893                 break;
 894         default:
 895                 goto xdr_error;
 896         }
 897
 898         DECODE_TAIL;
 899 }
 900
 901 static __be32
 902 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 903 {
 904         DECODE_HEAD;
 905
 906         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 907         if (status)
 908                 return status;
 909         READ_BUF(4);
 910         READ32(open_conf->oc_seqid);
 911
 912         DECODE_TAIL;
 913 }
 914
 915 static __be32
 916 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 917 {
 918         DECODE_HEAD;
 919
 920         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 921         if (status)
 922                 return status;
 923         READ_BUF(4);
 924         READ32(open_down->od_seqid);
 925         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 926                                            &open_down->od_deleg_want, NULL);
 927         if (status)
 928                 return status;
 929         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 930         if (status)
 931                 return status;
 932         DECODE_TAIL;
 933 }
 934
 935 static __be32
 936 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 937 {
 938         DECODE_HEAD;
 939
 940         READ_BUF(4);
 941         READ32(putfh->pf_fhlen);
 942         if (putfh->pf_fhlen > NFS4_FHSIZE)
 943                 goto xdr_error;
 944         READ_BUF(putfh->pf_fhlen);
 945         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 946
 947         DECODE_TAIL;
 948 }
 949
 950 static __be32
 951 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 952 {
 953         DECODE_HEAD;
 954
 955         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 956         if (status)
 957                 return status;
 958         READ_BUF(12);
 959         READ64(read->rd_offset);
 960         READ32(read->rd_length);
 961
 962         DECODE_TAIL;
 963 }
 964
 965 static __be32
 966 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 967 {
 968         DECODE_HEAD;
 969
 970         READ_BUF(24);
 971         READ64(readdir->rd_cookie);
 972         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 973         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 974         READ32(readdir->rd_maxcount);
 975         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 976                 goto out;
 977
 978         DECODE_TAIL;
 979 }
 980
 981 static __be32
 982 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 983 {
 984         DECODE_HEAD;
 985
 986         READ_BUF(4);
 987         READ32(remove->rm_namelen);
 988         READ_BUF(remove->rm_namelen);
 989         SAVEMEM(remove->rm_name, remove->rm_namelen);
 990         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 991                 return status;
 992
 993         DECODE_TAIL;
 994 }
 995
 996 static __be32
 997 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 998 {
 999         DECODE_HEAD;
1000
1001         READ_BUF(4);
1002         READ32(rename->rn_snamelen);
1003         READ_BUF(rename->rn_snamelen + 4);
1004         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1005         READ32(rename->rn_tnamelen);
1006         READ_BUF(rename->rn_tnamelen);
1007         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1008         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
1009                 return status;
1010         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
1011                 return status;
1012
1013         DECODE_TAIL;
1014 }
1015
1016 static __be32
1017 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1018 {
1019         DECODE_HEAD;
1020
1021         READ_BUF(sizeof(clientid_t));
1022         COPYMEM(clientid, sizeof(clientid_t));
1023
1024         DECODE_TAIL;
1025 }
1026
1027 static __be32
1028 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1029                      struct nfsd4_secinfo *secinfo)
1030 {
1031         DECODE_HEAD;
1032
1033         READ_BUF(4);
1034         READ32(secinfo->si_namelen);
1035         READ_BUF(secinfo->si_namelen);
1036         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1037         status = check_filename(secinfo->si_name, secinfo->si_namelen,
1038                                                                 nfserr_noent);
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 #if 0
1110         struct nfsd4_compoundargs save = {
1111                 .p = argp->p,
1112                 .end = argp->end,
1113                 .rqstp = argp->rqstp,
1114         };
1115         u32             ve_bmval[2];
1116         struct iattr    ve_iattr;           /* request */
1117         struct nfs4_acl *ve_acl;            /* request */
1118 #endif
1119         DECODE_HEAD;
1120
1121         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1122                 goto out;
1123
1124         /* For convenience's sake, we compare raw xdr'd attributes in
1125          * nfsd4_proc_verify; however we still decode here just to return
1126          * correct error in case of bad xdr. */
1127 #if 0
1128         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
1129         if (status == nfserr_inval) {
1130                 status = nfserrno(status);
1131                 goto out;
1132         }
1133 #endif
1134         READ_BUF(4);
1135         READ32(verify->ve_attrlen);
1136         READ_BUF(verify->ve_attrlen);
1137         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1138
1139         DECODE_TAIL;
1140 }
1141
1142 static int fill_in_write_vector(struct kvec *vec, struct kvec *head, struct page **pagelist, int buflen)
1143 {
1144         int i = 1;
1145
1146         vec[0].iov_base = head->iov_base;
1147         vec[0].iov_len = min_t(int, buflen, head->iov_len);
1148         buflen -= vec[0].iov_len;
1149
1150         while (buflen) {
1151                 vec[i].iov_base = page_address(pagelist[i - 1]);
1152                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
1153                 buflen -= vec[i].iov_len;
1154                 i++;
1155         }
1156         return i;
1157 }
1158
1159 static __be32
1160 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1161 {
1162         int avail;
1163         int len;
1164         struct page **pagelist;
1165         struct kvec head;
1166         DECODE_HEAD;
1167
1168         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1169         if (status)
1170                 return status;
1171         READ_BUF(16);
1172         READ64(write->wr_offset);
1173         READ32(write->wr_stable_how);
1174         if (write->wr_stable_how > 2)
1175                 goto xdr_error;
1176         READ32(write->wr_buflen);
1177
1178         /* Sorry .. no magic macros for this.. *
1179          * READ_BUF(write->wr_buflen);
1180          * SAVEMEM(write->wr_buf, write->wr_buflen);
1181          */
1182         avail = (char*)argp->end - (char*)argp->p;
1183         if (avail + argp->pagelen < write->wr_buflen) {
1184                 dprintk("NFSD: xdr error (%s:%d)\n",
1185                                 __FILE__, __LINE__);
1186                 goto xdr_error;
1187         }
1188         head.iov_base = p;
1189         head.iov_len = avail;
1190         WARN_ON(avail != (XDR_QUADLEN(avail) << 2));
1191         pagelist = argp->pagelist;
1192
1193         len = XDR_QUADLEN(write->wr_buflen) << 2;
1194         if (len >= avail) {
1195                 int pages;
1196
1197                 len -= avail;
1198
1199                 pages = len >> PAGE_SHIFT;
1200                 argp->pagelist += pages;
1201                 argp->pagelen -= pages * PAGE_SIZE;
1202                 len -= pages * PAGE_SIZE;
1203
1204                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1205                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1206         }
1207         argp->p += XDR_QUADLEN(len);
1208         write->wr_vlen = fill_in_write_vector(argp->rqstp->rq_vec,
1209                 &head, pagelist, write->wr_buflen);
1210         WARN_ON_ONCE(write->wr_vlen > ARRAY_SIZE(argp->rqstp->rq_vec));
1211
1212         DECODE_TAIL;
1213 }
1214
1215 static __be32
1216 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1217 {
1218         DECODE_HEAD;
1219
1220         READ_BUF(12);
1221         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1222         READ32(rlockowner->rl_owner.len);
1223         READ_BUF(rlockowner->rl_owner.len);
1224         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1225
1226         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1227                 return nfserr_inval;
1228         DECODE_TAIL;
1229 }
1230
1231 static __be32
1232 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1233                          struct nfsd4_exchange_id *exid)
1234 {
1235         int dummy, tmp;
1236         DECODE_HEAD;
1237
1238         READ_BUF(NFS4_VERIFIER_SIZE);
1239         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1240
1241         status = nfsd4_decode_opaque(argp, &exid->clname);
1242         if (status)
1243                 return nfserr_bad_xdr;
1244
1245         READ_BUF(4);
1246         READ32(exid->flags);
1247
1248         /* Ignore state_protect4_a */
1249         READ_BUF(4);
1250         READ32(exid->spa_how);
1251         switch (exid->spa_how) {
1252         case SP4_NONE:
1253                 break;
1254         case SP4_MACH_CRED:
1255                 /* spo_must_enforce */
1256                 READ_BUF(4);
1257                 READ32(dummy);
1258                 READ_BUF(dummy * 4);
1259                 p += dummy;
1260
1261                 /* spo_must_allow */
1262                 READ_BUF(4);
1263                 READ32(dummy);
1264                 READ_BUF(dummy * 4);
1265                 p += dummy;
1266                 break;
1267         case SP4_SSV:
1268                 /* ssp_ops */
1269                 READ_BUF(4);
1270                 READ32(dummy);
1271                 READ_BUF(dummy * 4);
1272                 p += dummy;
1273
1274                 READ_BUF(4);
1275                 READ32(dummy);
1276                 READ_BUF(dummy * 4);
1277                 p += dummy;
1278
1279                 /* ssp_hash_algs<> */
1280                 READ_BUF(4);
1281                 READ32(tmp);
1282                 while (tmp--) {
1283                         READ_BUF(4);
1284                         READ32(dummy);
1285                         READ_BUF(dummy);
1286                         p += XDR_QUADLEN(dummy);
1287                 }
1288
1289                 /* ssp_encr_algs<> */
1290                 READ_BUF(4);
1291                 READ32(tmp);
1292                 while (tmp--) {
1293                         READ_BUF(4);
1294                         READ32(dummy);
1295                         READ_BUF(dummy);
1296                         p += XDR_QUADLEN(dummy);
1297                 }
1298
1299                 /* ssp_window and ssp_num_gss_handles */
1300                 READ_BUF(8);
1301                 READ32(dummy);
1302                 READ32(dummy);
1303                 break;
1304         default:
1305                 goto xdr_error;
1306         }
1307
1308         /* Ignore Implementation ID */
1309         READ_BUF(4);    /* nfs_impl_id4 array length */
1310         READ32(dummy);
1311
1312         if (dummy > 1)
1313                 goto xdr_error;
1314
1315         if (dummy == 1) {
1316                 /* nii_domain */
1317                 READ_BUF(4);
1318                 READ32(dummy);
1319                 READ_BUF(dummy);
1320                 p += XDR_QUADLEN(dummy);
1321
1322                 /* nii_name */
1323                 READ_BUF(4);
1324                 READ32(dummy);
1325                 READ_BUF(dummy);
1326                 p += XDR_QUADLEN(dummy);
1327
1328                 /* nii_date */
1329                 READ_BUF(12);
1330                 p += 3;
1331         }
1332         DECODE_TAIL;
1333 }
1334
1335 static __be32
1336 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1337                             struct nfsd4_create_session *sess)
1338 {
1339         DECODE_HEAD;
1340         u32 dummy;
1341
1342         READ_BUF(16);
1343         COPYMEM(&sess->clientid, 8);
1344         READ32(sess->seqid);
1345         READ32(sess->flags);
1346
1347         /* Fore channel attrs */
1348         READ_BUF(28);
1349         READ32(dummy); /* headerpadsz is always 0 */
1350         READ32(sess->fore_channel.maxreq_sz);
1351         READ32(sess->fore_channel.maxresp_sz);
1352         READ32(sess->fore_channel.maxresp_cached);
1353         READ32(sess->fore_channel.maxops);
1354         READ32(sess->fore_channel.maxreqs);
1355         READ32(sess->fore_channel.nr_rdma_attrs);
1356         if (sess->fore_channel.nr_rdma_attrs == 1) {
1357                 READ_BUF(4);
1358                 READ32(sess->fore_channel.rdma_attrs);
1359         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1360                 dprintk("Too many fore channel attr bitmaps!\n");
1361                 goto xdr_error;
1362         }
1363
1364         /* Back channel attrs */
1365         READ_BUF(28);
1366         READ32(dummy); /* headerpadsz is always 0 */
1367         READ32(sess->back_channel.maxreq_sz);
1368         READ32(sess->back_channel.maxresp_sz);
1369         READ32(sess->back_channel.maxresp_cached);
1370         READ32(sess->back_channel.maxops);
1371         READ32(sess->back_channel.maxreqs);
1372         READ32(sess->back_channel.nr_rdma_attrs);
1373         if (sess->back_channel.nr_rdma_attrs == 1) {
1374                 READ_BUF(4);
1375                 READ32(sess->back_channel.rdma_attrs);
1376         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1377                 dprintk("Too many back channel attr bitmaps!\n");
1378                 goto xdr_error;
1379         }
1380
1381         READ_BUF(4);
1382         READ32(sess->callback_prog);
1383         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1384         DECODE_TAIL;
1385 }
1386
1387 static __be32
1388 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1389                              struct nfsd4_destroy_session *destroy_session)
1390 {
1391         DECODE_HEAD;
1392         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1393         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1394
1395         DECODE_TAIL;
1396 }
1397
1398 static __be32
1399 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1400                           struct nfsd4_free_stateid *free_stateid)
1401 {
1402         DECODE_HEAD;
1403
1404         READ_BUF(sizeof(stateid_t));
1405         READ32(free_stateid->fr_stateid.si_generation);
1406         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1407
1408         DECODE_TAIL;
1409 }
1410
1411 static __be32
1412 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1413                       struct nfsd4_sequence *seq)
1414 {
1415         DECODE_HEAD;
1416
1417         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1418         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1419         READ32(seq->seqid);
1420         READ32(seq->slotid);
1421         READ32(seq->maxslots);
1422         READ32(seq->cachethis);
1423
1424         DECODE_TAIL;
1425 }
1426
1427 static __be32
1428 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1429 {
1430         int i;
1431         __be32 *p, status;
1432         struct nfsd4_test_stateid_id *stateid;
1433
1434         READ_BUF(4);
1435         test_stateid->ts_num_ids = ntohl(*p++);
1436
1437         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1438
1439         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1440                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1441                 if (!stateid) {
1442                         status = nfserrno(-ENOMEM);
1443                         goto out;
1444                 }
1445
1446                 defer_free(argp, kfree, stateid);
1447                 INIT_LIST_HEAD(&stateid->ts_id_list);
1448                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1449
1450                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1451                 if (status)
1452                         goto out;
1453         }
1454
1455         status = 0;
1456 out:
1457         return status;
1458 xdr_error:
1459         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1460         status = nfserr_bad_xdr;
1461         goto out;
1462 }
1463
1464 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1465 {
1466         DECODE_HEAD;
1467
1468         READ_BUF(8);
1469         COPYMEM(&dc->clientid, 8);
1470
1471         DECODE_TAIL;
1472 }
1473
1474 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1475 {
1476         DECODE_HEAD;
1477
1478         READ_BUF(4);
1479         READ32(rc->rca_one_fs);
1480
1481         DECODE_TAIL;
1482 }
1483
1484 static __be32
1485 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1486 {
1487         return nfs_ok;
1488 }
1489
1490 static __be32
1491 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1492 {
1493         return nfserr_notsupp;
1494 }
1495
1496 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1497
1498 static nfsd4_dec nfsd4_dec_ops[] = {
1499         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1500         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1501         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1502         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1503         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1504         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1505         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1506         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1507         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1508         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1509         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1510         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1511         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1512         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1513         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1514         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1515         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1516         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1517         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1518         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1519         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1520         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1521         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1522         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1523         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1524         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1525         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1526         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1527         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1528         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1529         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1530         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1531         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1532         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1533         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1534         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1535         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1536 };
1537
1538 static nfsd4_dec nfsd41_dec_ops[] = {
1539         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1540         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1541         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1542         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1543         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1544         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1545         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1546         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1547         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1548         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1549         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1550         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1551         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1552         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1553         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1554         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1555         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1556         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1557         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1558         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1559         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1560         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1561         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1562         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1563         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1564         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1565         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1566         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1567         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1568         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1569         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1570         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1571         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1572         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1573         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1574         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1575         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1576
1577         /* new operations for NFSv4.1 */
1578         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1579         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1580         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1581         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1582         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1583         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1584         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1585         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1586         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1587         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1588         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1589         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1590         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1591         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1592         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1593         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1594         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1595         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1596         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1597 };
1598
1599 struct nfsd4_minorversion_ops {
1600         nfsd4_dec *decoders;
1601         int nops;
1602 };
1603
1604 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1605         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1606         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1607 };
1608
1609 static __be32
1610 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1611 {
1612         DECODE_HEAD;
1613         struct nfsd4_op *op;
1614         struct nfsd4_minorversion_ops *ops;
1615         bool cachethis = false;
1616         int i;
1617
1618         READ_BUF(4);
1619         READ32(argp->taglen);
1620         READ_BUF(argp->taglen + 8);
1621         SAVEMEM(argp->tag, argp->taglen);
1622         READ32(argp->minorversion);
1623         READ32(argp->opcnt);
1624
1625         if (argp->taglen > NFSD4_MAX_TAGLEN)
1626                 goto xdr_error;
1627         if (argp->opcnt > 100)
1628                 goto xdr_error;
1629
1630         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1631                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1632                 if (!argp->ops) {
1633                         argp->ops = argp->iops;
1634                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1635                         goto xdr_error;
1636                 }
1637         }
1638
1639         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1640                 argp->opcnt = 0;
1641
1642         ops = &nfsd4_minorversion[argp->minorversion];
1643         for (i = 0; i < argp->opcnt; i++) {
1644                 op = &argp->ops[i];
1645                 op->replay = NULL;
1646
1647                 READ_BUF(4);
1648                 READ32(op->opnum);
1649
1650                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1651                         op->status = ops->decoders[op->opnum](argp, &op->u);
1652                 else {
1653                         op->opnum = OP_ILLEGAL;
1654                         op->status = nfserr_op_illegal;
1655                 }
1656
1657                 if (op->status) {
1658                         argp->opcnt = i+1;
1659                         break;
1660                 }
1661                 /*
1662                  * We'll try to cache the result in the DRC if any one
1663                  * op in the compound wants to be cached:
1664                  */
1665                 cachethis |= nfsd4_cache_this_op(op);
1666         }
1667         /* Sessions make the DRC unnecessary: */
1668         if (argp->minorversion)
1669                 cachethis = false;
1670         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1671
1672         DECODE_TAIL;
1673 }
1674
1675 #define WRITE32(n)               *p++ = htonl(n)
1676 #define WRITE64(n)               do {                           \
1677         *p++ = htonl((u32)((n) >> 32));                         \
1678         *p++ = htonl((u32)(n));                                 \
1679 } while (0)
1680 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1681         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1682         memcpy(p, ptr, nbytes);                                 \
1683         p += XDR_QUADLEN(nbytes);                               \
1684 }} while (0)
1685
1686 static void write32(__be32 **p, u32 n)
1687 {
1688         *(*p)++ = htonl(n);
1689 }
1690
1691 static void write64(__be32 **p, u64 n)
1692 {
1693         write32(p, (n >> 32));
1694         write32(p, (u32)n);
1695 }
1696
1697 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1698 {
1699         if (IS_I_VERSION(inode)) {
1700                 write64(p, inode->i_version);
1701         } else {
1702                 write32(p, stat->ctime.tv_sec);
1703                 write32(p, stat->ctime.tv_nsec);
1704         }
1705 }
1706
1707 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1708 {
1709         write32(p, c->atomic);
1710         if (c->change_supported) {
1711                 write64(p, c->before_change);
1712                 write64(p, c->after_change);
1713         } else {
1714                 write32(p, c->before_ctime_sec);
1715                 write32(p, c->before_ctime_nsec);
1716                 write32(p, c->after_ctime_sec);
1717                 write32(p, c->after_ctime_nsec);
1718         }
1719 }
1720
1721 #define RESERVE_SPACE(nbytes)   do {                            \
1722         p = resp->p;                                            \
1723         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1724 } while (0)
1725 #define ADJUST_ARGS()           resp->p = p
1726
1727 /*
1728  * Header routine to setup seqid operation replay cache
1729  */
1730 #define ENCODE_SEQID_OP_HEAD                                    \
1731         __be32 *save;                                           \
1732                                                                 \
1733         save = resp->p;
1734
1735 /*
1736  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1737  * is where sequence id's are incremented, and the replay cache is filled.
1738  * Note that we increment sequence id's here, at the last moment, so we're sure
1739  * we know whether the error to be returned is a sequence id mutating error.
1740  */
1741
1742 static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
1743 {
1744         struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;
1745
1746         if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
1747                 stateowner->so_seqid++;
1748                 stateowner->so_replay.rp_status = nfserr;
1749                 stateowner->so_replay.rp_buflen =
1750                           (char *)resp->p - (char *)save;
1751                 memcpy(stateowner->so_replay.rp_buf, save,
1752                         stateowner->so_replay.rp_buflen);
1753                 nfsd4_purge_closed_stateid(stateowner);
1754         }
1755 }
1756
1757 /* Encode as an array of strings the string given with components
1758  * separated @sep, escaped with esc_enter and esc_exit.
1759  */
1760 static __be32 nfsd4_encode_components_esc(char sep, char *components,
1761                                    __be32 **pp, int *buflen,
1762                                    char esc_enter, char esc_exit)
1763 {
1764         __be32 *p = *pp;
1765         __be32 *countp = p;
1766         int strlen, count=0;
1767         char *str, *end, *next;
1768
1769         dprintk("nfsd4_encode_components(%s)\n", components);
1770         if ((*buflen -= 4) < 0)
1771                 return nfserr_resource;
1772         WRITE32(0); /* We will fill this in with @count later */
1773         end = str = components;
1774         while (*end) {
1775                 bool found_esc = false;
1776
1777                 /* try to parse as esc_start, ..., esc_end, sep */
1778                 if (*str == esc_enter) {
1779                         for (; *end && (*end != esc_exit); end++)
1780                                 /* find esc_exit or end of string */;
1781                         next = end + 1;
1782                         if (*end && (!*next || *next == sep)) {
1783                                 str++;
1784                                 found_esc = true;
1785                         }
1786                 }
1787
1788                 if (!found_esc)
1789                         for (; *end && (*end != sep); end++)
1790                                 /* find sep or end of string */;
1791
1792                 strlen = end - str;
1793                 if (strlen) {
1794                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1795                                 return nfserr_resource;
1796                         WRITE32(strlen);
1797                         WRITEMEM(str, strlen);
1798                         count++;
1799                 }
1800                 else
1801                         end++;
1802                 str = end;
1803         }
1804         *pp = p;
1805         p = countp;
1806         WRITE32(count);
1807         return 0;
1808 }
1809
1810 /* Encode as an array of strings the string given with components
1811  * separated @sep.
1812  */
1813 static __be32 nfsd4_encode_components(char sep, char *components,
1814                                    __be32 **pp, int *buflen)
1815 {
1816         return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1817 }
1818
1819 /*
1820  * encode a location element of a fs_locations structure
1821  */
1822 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1823                                     __be32 **pp, int *buflen)
1824 {
1825         __be32 status;
1826         __be32 *p = *pp;
1827
1828         status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1829                                                 '[', ']');
1830         if (status)
1831                 return status;
1832         status = nfsd4_encode_components('/', location->path, &p, buflen);
1833         if (status)
1834                 return status;
1835         *pp = p;
1836         return 0;
1837 }
1838
1839 /*
1840  * Encode a path in RFC3530 'pathname4' format
1841  */
1842 static __be32 nfsd4_encode_path(const struct path *root,
1843                 const struct path *path, __be32 **pp, int *buflen)
1844 {
1845         struct path cur = {
1846                 .mnt = path->mnt,
1847                 .dentry = path->dentry,
1848         };
1849         __be32 *p = *pp;
1850         struct dentry **components = NULL;
1851         unsigned int ncomponents = 0;
1852         __be32 err = nfserr_jukebox;
1853
1854         dprintk("nfsd4_encode_components(");
1855
1856         path_get(&cur);
1857         /* First walk the path up to the nfsd root, and store the
1858          * dentries/path components in an array.
1859          */
1860         for (;;) {
1861                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1862                         break;
1863                 if (cur.dentry == cur.mnt->mnt_root) {
1864                         if (follow_up(&cur))
1865                                 continue;
1866                         goto out_free;
1867                 }
1868                 if ((ncomponents & 15) == 0) {
1869                         struct dentry **new;
1870                         new = krealloc(components,
1871                                         sizeof(*new) * (ncomponents + 16),
1872                                         GFP_KERNEL);
1873                         if (!new)
1874                                 goto out_free;
1875                         components = new;
1876                 }
1877                 components[ncomponents++] = cur.dentry;
1878                 cur.dentry = dget_parent(cur.dentry);
1879         }
1880
1881         *buflen -= 4;
1882         if (*buflen < 0)
1883                 goto out_free;
1884         WRITE32(ncomponents);
1885
1886         while (ncomponents) {
1887                 struct dentry *dentry = components[ncomponents - 1];
1888                 unsigned int len = dentry->d_name.len;
1889
1890                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1891                 if (*buflen < 0)
1892                         goto out_free;
1893                 WRITE32(len);
1894                 WRITEMEM(dentry->d_name.name, len);
1895                 dprintk("/%s", dentry->d_name.name);
1896                 dput(dentry);
1897                 ncomponents--;
1898         }
1899
1900         *pp = p;
1901         err = 0;
1902 out_free:
1903         dprintk(")\n");
1904         while (ncomponents)
1905                 dput(components[--ncomponents]);
1906         kfree(components);
1907         path_put(&cur);
1908         return err;
1909 }
1910
1911 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1912                 const struct path *path, __be32 **pp, int *buflen)
1913 {
1914         struct svc_export *exp_ps;
1915         __be32 res;
1916
1917         exp_ps = rqst_find_fsidzero_export(rqstp);
1918         if (IS_ERR(exp_ps))
1919                 return nfserrno(PTR_ERR(exp_ps));
1920         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1921         exp_put(exp_ps);
1922         return res;
1923 }
1924
1925 /*
1926  *  encode a fs_locations structure
1927  */
1928 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1929                                      struct svc_export *exp,
1930                                      __be32 **pp, int *buflen)
1931 {
1932         __be32 status;
1933         int i;
1934         __be32 *p = *pp;
1935         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1936
1937         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1938         if (status)
1939                 return status;
1940         if ((*buflen -= 4) < 0)
1941                 return nfserr_resource;
1942         WRITE32(fslocs->locations_count);
1943         for (i=0; i<fslocs->locations_count; i++) {
1944                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1945                                                    &p, buflen);
1946                 if (status)
1947                         return status;
1948         }
1949         *pp = p;
1950         return 0;
1951 }
1952
1953 static u32 nfs4_file_type(umode_t mode)
1954 {
1955         switch (mode & S_IFMT) {
1956         case S_IFIFO:   return NF4FIFO;
1957         case S_IFCHR:   return NF4CHR;
1958         case S_IFDIR:   return NF4DIR;
1959         case S_IFBLK:   return NF4BLK;
1960         case S_IFLNK:   return NF4LNK;
1961         case S_IFREG:   return NF4REG;
1962         case S_IFSOCK:  return NF4SOCK;
1963         default:        return NF4BAD;
1964         };
1965 }
1966
1967 static __be32
1968 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1969                         __be32 **p, int *buflen)
1970 {
1971         int status;
1972
1973         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1974                 return nfserr_resource;
1975         if (whotype != NFS4_ACL_WHO_NAMED)
1976                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1977         else if (group)
1978                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1979         else
1980                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1981         if (status < 0)
1982                 return nfserrno(status);
1983         *p = xdr_encode_opaque(*p, NULL, status);
1984         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1985         BUG_ON(*buflen < 0);
1986         return 0;
1987 }
1988
1989 static inline __be32
1990 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1991 {
1992         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1993 }
1994
1995 static inline __be32
1996 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1997 {
1998         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1999 }
2000
2001 static inline __be32
2002 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
2003                 __be32 **p, int *buflen)
2004 {
2005         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
2006 }
2007
2008 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2009                               FATTR4_WORD0_RDATTR_ERROR)
2010 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2011
2012 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2013 {
2014         /* As per referral draft:  */
2015         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2016             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2017                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2018                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2019                         *rdattr_err = NFSERR_MOVED;
2020                 else
2021                         return nfserr_moved;
2022         }
2023         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2024         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2025         return 0;
2026 }
2027
2028
2029 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2030 {
2031         struct path path = exp->ex_path;
2032         int err;
2033
2034         path_get(&path);
2035         while (follow_up(&path)) {
2036                 if (path.dentry != path.mnt->mnt_root)
2037                         break;
2038         }
2039         err = vfs_getattr(path.mnt, path.dentry, stat);
2040         path_put(&path);
2041         return err;
2042 }
2043
2044 /*
2045  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2046  * ourselves.
2047  *
2048  * @countp is the buffer size in _words_; upon successful return this becomes
2049  * replaced with the number of words written.
2050  */
2051 __be32
2052 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2053                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
2054                 struct svc_rqst *rqstp, int ignore_crossmnt)
2055 {
2056         u32 bmval0 = bmval[0];
2057         u32 bmval1 = bmval[1];
2058         u32 bmval2 = bmval[2];
2059         struct kstat stat;
2060         struct svc_fh tempfh;
2061         struct kstatfs statfs;
2062         int buflen = *countp << 2;
2063         __be32 *attrlenp;
2064         u32 dummy;
2065         u64 dummy64;
2066         u32 rdattr_err = 0;
2067         __be32 *p = buffer;
2068         __be32 status;
2069         int err;
2070         int aclsupport = 0;
2071         struct nfs4_acl *acl = NULL;
2072         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2073         u32 minorversion = resp->cstate.minorversion;
2074         struct path path = {
2075                 .mnt    = exp->ex_path.mnt,
2076                 .dentry = dentry,
2077         };
2078
2079         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2080         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2081         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2082         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2083
2084         if (exp->ex_fslocs.migrated) {
2085                 BUG_ON(bmval[2]);
2086                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2087                 if (status)
2088                         goto out;
2089         }
2090
2091         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
2092         if (err)
2093                 goto out_nfserr;
2094         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2095                         FATTR4_WORD0_MAXNAME)) ||
2096             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2097                        FATTR4_WORD1_SPACE_TOTAL))) {
2098                 err = vfs_statfs(&path, &statfs);
2099                 if (err)
2100                         goto out_nfserr;
2101         }
2102         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2103                 fh_init(&tempfh, NFS4_FHSIZE);
2104                 status = fh_compose(&tempfh, exp, dentry, NULL);
2105                 if (status)
2106                         goto out;
2107                 fhp = &tempfh;
2108         }
2109         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2110                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2111                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2112                 aclsupport = (err == 0);
2113                 if (bmval0 & FATTR4_WORD0_ACL) {
2114                         if (err == -EOPNOTSUPP)
2115                                 bmval0 &= ~FATTR4_WORD0_ACL;
2116                         else if (err == -EINVAL) {
2117                                 status = nfserr_attrnotsupp;
2118                                 goto out;
2119                         } else if (err != 0)
2120                                 goto out_nfserr;
2121                 }
2122         }
2123
2124         if (bmval2) {
2125                 if ((buflen -= 16) < 0)
2126                         goto out_resource;
2127                 WRITE32(3);
2128                 WRITE32(bmval0);
2129                 WRITE32(bmval1);
2130                 WRITE32(bmval2);
2131         } else if (bmval1) {
2132                 if ((buflen -= 12) < 0)
2133                         goto out_resource;
2134                 WRITE32(2);
2135                 WRITE32(bmval0);
2136                 WRITE32(bmval1);
2137         } else {
2138                 if ((buflen -= 8) < 0)
2139                         goto out_resource;
2140                 WRITE32(1);
2141                 WRITE32(bmval0);
2142         }
2143         attrlenp = p++;                /* to be backfilled later */
2144
2145         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2146                 u32 word0 = nfsd_suppattrs0(minorversion);
2147                 u32 word1 = nfsd_suppattrs1(minorversion);
2148                 u32 word2 = nfsd_suppattrs2(minorversion);
2149
2150                 if (!aclsupport)
2151                         word0 &= ~FATTR4_WORD0_ACL;
2152                 if (!word2) {
2153                         if ((buflen -= 12) < 0)
2154                                 goto out_resource;
2155                         WRITE32(2);
2156                         WRITE32(word0);
2157                         WRITE32(word1);
2158                 } else {
2159                         if ((buflen -= 16) < 0)
2160                                 goto out_resource;
2161                         WRITE32(3);
2162                         WRITE32(word0);
2163                         WRITE32(word1);
2164                         WRITE32(word2);
2165                 }
2166         }
2167         if (bmval0 & FATTR4_WORD0_TYPE) {
2168                 if ((buflen -= 4) < 0)
2169                         goto out_resource;
2170                 dummy = nfs4_file_type(stat.mode);
2171                 if (dummy == NF4BAD)
2172                         goto out_serverfault;
2173                 WRITE32(dummy);
2174         }
2175         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2176                 if ((buflen -= 4) < 0)
2177                         goto out_resource;
2178                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2179                         WRITE32(NFS4_FH_PERSISTENT);
2180                 else
2181                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2182         }
2183         if (bmval0 & FATTR4_WORD0_CHANGE) {
2184                 if ((buflen -= 8) < 0)
2185                         goto out_resource;
2186                 write_change(&p, &stat, dentry->d_inode);
2187         }
2188         if (bmval0 & FATTR4_WORD0_SIZE) {
2189                 if ((buflen -= 8) < 0)
2190                         goto out_resource;
2191                 WRITE64(stat.size);
2192         }
2193         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2194                 if ((buflen -= 4) < 0)
2195                         goto out_resource;
2196                 WRITE32(1);
2197         }
2198         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2199                 if ((buflen -= 4) < 0)
2200                         goto out_resource;
2201                 WRITE32(1);
2202         }
2203         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2204                 if ((buflen -= 4) < 0)
2205                         goto out_resource;
2206                 WRITE32(0);
2207         }
2208         if (bmval0 & FATTR4_WORD0_FSID) {
2209                 if ((buflen -= 16) < 0)
2210                         goto out_resource;
2211                 if (exp->ex_fslocs.migrated) {
2212                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2213                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2214                 } else switch(fsid_source(fhp)) {
2215                 case FSIDSOURCE_FSID:
2216                         WRITE64((u64)exp->ex_fsid);
2217                         WRITE64((u64)0);
2218                         break;
2219                 case FSIDSOURCE_DEV:
2220                         WRITE32(0);
2221                         WRITE32(MAJOR(stat.dev));
2222                         WRITE32(0);
2223                         WRITE32(MINOR(stat.dev));
2224                         break;
2225                 case FSIDSOURCE_UUID:
2226                         WRITEMEM(exp->ex_uuid, 16);
2227                         break;
2228                 }
2229         }
2230         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2231                 if ((buflen -= 4) < 0)
2232                         goto out_resource;
2233                 WRITE32(0);
2234         }
2235         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2236                 if ((buflen -= 4) < 0)
2237                         goto out_resource;
2238                 WRITE32(nfsd4_lease);
2239         }
2240         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2241                 if ((buflen -= 4) < 0)
2242                         goto out_resource;
2243                 WRITE32(rdattr_err);
2244         }
2245         if (bmval0 & FATTR4_WORD0_ACL) {
2246                 struct nfs4_ace *ace;
2247
2248                 if (acl == NULL) {
2249                         if ((buflen -= 4) < 0)
2250                                 goto out_resource;
2251
2252                         WRITE32(0);
2253                         goto out_acl;
2254                 }
2255                 if ((buflen -= 4) < 0)
2256                         goto out_resource;
2257                 WRITE32(acl->naces);
2258
2259                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2260                         if ((buflen -= 4*3) < 0)
2261                                 goto out_resource;
2262                         WRITE32(ace->type);
2263                         WRITE32(ace->flag);
2264                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2265                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
2266                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2267                                 &p, &buflen);
2268                         if (status == nfserr_resource)
2269                                 goto out_resource;
2270                         if (status)
2271                                 goto out;
2272                 }
2273         }
2274 out_acl:
2275         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2276                 if ((buflen -= 4) < 0)
2277                         goto out_resource;
2278                 WRITE32(aclsupport ?
2279                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2280         }
2281         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2282                 if ((buflen -= 4) < 0)
2283                         goto out_resource;
2284                 WRITE32(1);
2285         }
2286         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2287                 if ((buflen -= 4) < 0)
2288                         goto out_resource;
2289                 WRITE32(0);
2290         }
2291         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2292                 if ((buflen -= 4) < 0)
2293                         goto out_resource;
2294                 WRITE32(1);
2295         }
2296         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2297                 if ((buflen -= 4) < 0)
2298                         goto out_resource;
2299                 WRITE32(1);
2300         }
2301         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2302                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2303                 if (buflen < 0)
2304                         goto out_resource;
2305                 WRITE32(fhp->fh_handle.fh_size);
2306                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2307         }
2308         if (bmval0 & FATTR4_WORD0_FILEID) {
2309                 if ((buflen -= 8) < 0)
2310                         goto out_resource;
2311                 WRITE64(stat.ino);
2312         }
2313         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2314                 if ((buflen -= 8) < 0)
2315                         goto out_resource;
2316                 WRITE64((u64) statfs.f_ffree);
2317         }
2318         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2319                 if ((buflen -= 8) < 0)
2320                         goto out_resource;
2321                 WRITE64((u64) statfs.f_ffree);
2322         }
2323         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2324                 if ((buflen -= 8) < 0)
2325                         goto out_resource;
2326                 WRITE64((u64) statfs.f_files);
2327         }
2328         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2329                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2330                 if (status == nfserr_resource)
2331                         goto out_resource;
2332                 if (status)
2333                         goto out;
2334         }
2335         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2336                 if ((buflen -= 4) < 0)
2337                         goto out_resource;
2338                 WRITE32(1);
2339         }
2340         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2341                 if ((buflen -= 8) < 0)
2342                         goto out_resource;
2343                 WRITE64(~(u64)0);
2344         }
2345         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2346                 if ((buflen -= 4) < 0)
2347                         goto out_resource;
2348                 WRITE32(255);
2349         }
2350         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2351                 if ((buflen -= 4) < 0)
2352                         goto out_resource;
2353                 WRITE32(statfs.f_namelen);
2354         }
2355         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2356                 if ((buflen -= 8) < 0)
2357                         goto out_resource;
2358                 WRITE64((u64) svc_max_payload(rqstp));
2359         }
2360         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2361                 if ((buflen -= 8) < 0)
2362                         goto out_resource;
2363                 WRITE64((u64) svc_max_payload(rqstp));
2364         }
2365         if (bmval1 & FATTR4_WORD1_MODE) {
2366                 if ((buflen -= 4) < 0)
2367                         goto out_resource;
2368                 WRITE32(stat.mode & S_IALLUGO);
2369         }
2370         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2371                 if ((buflen -= 4) < 0)
2372                         goto out_resource;
2373                 WRITE32(1);
2374         }
2375         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2376                 if ((buflen -= 4) < 0)
2377                         goto out_resource;
2378                 WRITE32(stat.nlink);
2379         }
2380         if (bmval1 & FATTR4_WORD1_OWNER) {
2381                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2382                 if (status == nfserr_resource)
2383                         goto out_resource;
2384                 if (status)
2385                         goto out;
2386         }
2387         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2388                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2389                 if (status == nfserr_resource)
2390                         goto out_resource;
2391                 if (status)
2392                         goto out;
2393         }
2394         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2395                 if ((buflen -= 8) < 0)
2396                         goto out_resource;
2397                 WRITE32((u32) MAJOR(stat.rdev));
2398                 WRITE32((u32) MINOR(stat.rdev));
2399         }
2400         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2401                 if ((buflen -= 8) < 0)
2402                         goto out_resource;
2403                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2404                 WRITE64(dummy64);
2405         }
2406         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2407                 if ((buflen -= 8) < 0)
2408                         goto out_resource;
2409                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2410                 WRITE64(dummy64);
2411         }
2412         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2413                 if ((buflen -= 8) < 0)
2414                         goto out_resource;
2415                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2416                 WRITE64(dummy64);
2417         }
2418         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2419                 if ((buflen -= 8) < 0)
2420                         goto out_resource;
2421                 dummy64 = (u64)stat.blocks << 9;
2422                 WRITE64(dummy64);
2423         }
2424         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2425                 if ((buflen -= 12) < 0)
2426                         goto out_resource;
2427                 WRITE32(0);
2428                 WRITE32(stat.atime.tv_sec);
2429                 WRITE32(stat.atime.tv_nsec);
2430         }
2431         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2432                 if ((buflen -= 12) < 0)
2433                         goto out_resource;
2434                 WRITE32(0);
2435                 WRITE32(1);
2436                 WRITE32(0);
2437         }
2438         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2439                 if ((buflen -= 12) < 0)
2440                         goto out_resource;
2441                 WRITE32(0);
2442                 WRITE32(stat.ctime.tv_sec);
2443                 WRITE32(stat.ctime.tv_nsec);
2444         }
2445         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2446                 if ((buflen -= 12) < 0)
2447                         goto out_resource;
2448                 WRITE32(0);
2449                 WRITE32(stat.mtime.tv_sec);
2450                 WRITE32(stat.mtime.tv_nsec);
2451         }
2452         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2453                 if ((buflen -= 8) < 0)
2454                         goto out_resource;
2455                 /*
2456                  * Get parent's attributes if not ignoring crossmount
2457                  * and this is the root of a cross-mounted filesystem.
2458                  */
2459                 if (ignore_crossmnt == 0 &&
2460                     dentry == exp->ex_path.mnt->mnt_root)
2461                         get_parent_attributes(exp, &stat);
2462                 WRITE64(stat.ino);
2463         }
2464         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2465                 WRITE32(3);
2466                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2467                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2468                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2469         }
2470
2471         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2472         *countp = p - buffer;
2473         status = nfs_ok;
2474
2475 out:
2476         kfree(acl);
2477         if (fhp == &tempfh)
2478                 fh_put(&tempfh);
2479         return status;
2480 out_nfserr:
2481         status = nfserrno(err);
2482         goto out;
2483 out_resource:
2484         *countp = 0;
2485         status = nfserr_resource;
2486         goto out;
2487 out_serverfault:
2488         status = nfserr_serverfault;
2489         goto out;
2490 }
2491
2492 static inline int attributes_need_mount(u32 *bmval)
2493 {
2494         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2495                 return 1;
2496         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2497                 return 1;
2498         return 0;
2499 }
2500
2501 static __be32
2502 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2503                 const char *name, int namlen, __be32 *p, int *buflen)
2504 {
2505         struct svc_export *exp = cd->rd_fhp->fh_export;
2506         struct dentry *dentry;
2507         __be32 nfserr;
2508         int ignore_crossmnt = 0;
2509
2510         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2511         if (IS_ERR(dentry))
2512                 return nfserrno(PTR_ERR(dentry));
2513         if (!dentry->d_inode) {
2514                 /*
2515                  * nfsd_buffered_readdir drops the i_mutex between
2516                  * readdir and calling this callback, leaving a window
2517                  * where this directory entry could have gone away.
2518                  */
2519                 dput(dentry);
2520                 return nfserr_noent;
2521         }
2522
2523         exp_get(exp);
2524         /*
2525          * In the case of a mountpoint, the client may be asking for
2526          * attributes that are only properties of the underlying filesystem
2527          * as opposed to the cross-mounted file system. In such a case,
2528          * we will not follow the cross mount and will fill the attribtutes
2529          * directly from the mountpoint dentry.
2530          */
2531         if (nfsd_mountpoint(dentry, exp)) {
2532                 int err;
2533
2534                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2535                                 && !attributes_need_mount(cd->rd_bmval)) {
2536                         ignore_crossmnt = 1;
2537                         goto out_encode;
2538                 }
2539                 /*
2540                  * Why the heck aren't we just using nfsd_lookup??
2541                  * Different "."/".." handling?  Something else?
2542                  * At least, add a comment here to explain....
2543                  */
2544                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2545                 if (err) {
2546                         nfserr = nfserrno(err);
2547                         goto out_put;
2548                 }
2549                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2550                 if (nfserr)
2551                         goto out_put;
2552
2553         }
2554 out_encode:
2555         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2556                                         cd->rd_rqstp, ignore_crossmnt);
2557 out_put:
2558         dput(dentry);
2559         exp_put(exp);
2560         return nfserr;
2561 }
2562
2563 static __be32 *
2564 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2565 {
2566         __be32 *attrlenp;
2567
2568         if (buflen < 6)
2569                 return NULL;
2570         *p++ = htonl(2);
2571         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2572         *p++ = htonl(0);                         /* bmval1 */
2573
2574         attrlenp = p++;
2575         *p++ = nfserr;       /* no htonl */
2576         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2577         return p;
2578 }
2579
2580 static int
2581 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2582                     loff_t offset, u64 ino, unsigned int d_type)
2583 {
2584         struct readdir_cd *ccd = ccdv;
2585         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2586         int buflen;
2587         __be32 *p = cd->buffer;
2588         __be32 *cookiep;
2589         __be32 nfserr = nfserr_toosmall;
2590
2591         /* In nfsv4, "." and ".." never make it onto the wire.. */
2592         if (name && isdotent(name, namlen)) {
2593                 cd->common.err = nfs_ok;
2594                 return 0;
2595         }
2596
2597         if (cd->offset)
2598                 xdr_encode_hyper(cd->offset, (u64) offset);
2599
2600         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2601         if (buflen < 0)
2602                 goto fail;
2603
2604         *p++ = xdr_one;                             /* mark entry present */
2605         cookiep = p;
2606         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2607         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2608
2609         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2610         switch (nfserr) {
2611         case nfs_ok:
2612                 p += buflen;
2613                 break;
2614         case nfserr_resource:
2615                 nfserr = nfserr_toosmall;
2616                 goto fail;
2617         case nfserr_noent:
2618                 goto skip_entry;
2619         default:
2620                 /*
2621                  * If the client requested the RDATTR_ERROR attribute,
2622                  * we stuff the error code into this attribute
2623                  * and continue.  If this attribute was not requested,
2624                  * then in accordance with the spec, we fail the
2625                  * entire READDIR operation(!)
2626                  */
2627                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2628                         goto fail;
2629                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2630                 if (p == NULL) {
2631                         nfserr = nfserr_toosmall;
2632                         goto fail;
2633                 }
2634         }
2635         cd->buflen -= (p - cd->buffer);
2636         cd->buffer = p;
2637         cd->offset = cookiep;
2638 skip_entry:
2639         cd->common.err = nfs_ok;
2640         return 0;
2641 fail:
2642         cd->common.err = nfserr;
2643         return -EINVAL;
2644 }
2645
2646 static void
2647 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2648 {
2649         __be32 *p;
2650
2651         RESERVE_SPACE(sizeof(stateid_t));
2652         WRITE32(sid->si_generation);
2653         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2654         ADJUST_ARGS();
2655 }
2656
2657 static __be32
2658 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2659 {
2660         __be32 *p;
2661
2662         if (!nfserr) {
2663                 RESERVE_SPACE(8);
2664                 WRITE32(access->ac_supported);
2665                 WRITE32(access->ac_resp_access);
2666                 ADJUST_ARGS();
2667         }
2668         return nfserr;
2669 }
2670
2671 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2672 {
2673         __be32 *p;
2674
2675         if (!nfserr) {
2676                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2677                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2678                 WRITE32(bcts->dir);
2679                 /* Sorry, we do not yet support RDMA over 4.1: */
2680                 WRITE32(0);
2681                 ADJUST_ARGS();
2682         }
2683         return nfserr;
2684 }
2685
2686 static __be32
2687 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2688 {
2689         ENCODE_SEQID_OP_HEAD;
2690
2691         if (!nfserr)
2692                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2693
2694         encode_seqid_op_tail(resp, save, nfserr);
2695         return nfserr;
2696 }
2697
2698
2699 static __be32
2700 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2701 {
2702         __be32 *p;
2703
2704         if (!nfserr) {
2705                 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2706                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2707                 ADJUST_ARGS();
2708         }
2709         return nfserr;
2710 }
2711
2712 static __be32
2713 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2714 {
2715         __be32 *p;
2716
2717         if (!nfserr) {
2718                 RESERVE_SPACE(32);
2719                 write_cinfo(&p, &create->cr_cinfo);
2720                 WRITE32(2);
2721                 WRITE32(create->cr_bmval[0]);
2722                 WRITE32(create->cr_bmval[1]);
2723                 ADJUST_ARGS();
2724         }
2725         return nfserr;
2726 }
2727
2728 static __be32
2729 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2730 {
2731         struct svc_fh *fhp = getattr->ga_fhp;
2732         int buflen;
2733
2734         if (nfserr)
2735                 return nfserr;
2736
2737         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2738         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2739                                     resp->p, &buflen, getattr->ga_bmval,
2740                                     resp->rqstp, 0);
2741         if (!nfserr)
2742                 resp->p += buflen;
2743         return nfserr;
2744 }
2745
2746 static __be32
2747 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2748 {
2749         struct svc_fh *fhp = *fhpp;
2750         unsigned int len;
2751         __be32 *p;
2752
2753         if (!nfserr) {
2754                 len = fhp->fh_handle.fh_size;
2755                 RESERVE_SPACE(len + 4);
2756                 WRITE32(len);
2757                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2758                 ADJUST_ARGS();
2759         }
2760         return nfserr;
2761 }
2762
2763 /*
2764 * Including all fields other than the name, a LOCK4denied structure requires
2765 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2766 */
2767 static void
2768 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2769 {
2770         struct xdr_netobj *conf = &ld->ld_owner;
2771         __be32 *p;
2772
2773         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2774         WRITE64(ld->ld_start);
2775         WRITE64(ld->ld_length);
2776         WRITE32(ld->ld_type);
2777         if (conf->len) {
2778                 WRITEMEM(&ld->ld_clientid, 8);
2779                 WRITE32(conf->len);
2780                 WRITEMEM(conf->data, conf->len);
2781                 kfree(conf->data);
2782         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2783                 WRITE64((u64)0); /* clientid */
2784                 WRITE32(0); /* length of owner name */
2785         }
2786         ADJUST_ARGS();
2787 }
2788
2789 static __be32
2790 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2791 {
2792         ENCODE_SEQID_OP_HEAD;
2793
2794         if (!nfserr)
2795                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2796         else if (nfserr == nfserr_denied)
2797                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2798
2799         encode_seqid_op_tail(resp, save, nfserr);
2800         return nfserr;
2801 }
2802
2803 static __be32
2804 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2805 {
2806         if (nfserr == nfserr_denied)
2807                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2808         return nfserr;
2809 }
2810
2811 static __be32
2812 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2813 {
2814         ENCODE_SEQID_OP_HEAD;
2815
2816         if (!nfserr)
2817                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2818
2819         encode_seqid_op_tail(resp, save, nfserr);
2820         return nfserr;
2821 }
2822
2823
2824 static __be32
2825 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2826 {
2827         __be32 *p;
2828
2829         if (!nfserr) {
2830                 RESERVE_SPACE(20);
2831                 write_cinfo(&p, &link->li_cinfo);
2832                 ADJUST_ARGS();
2833         }
2834         return nfserr;
2835 }
2836
2837
2838 static __be32
2839 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2840 {
2841         __be32 *p;
2842         ENCODE_SEQID_OP_HEAD;
2843
2844         if (nfserr)
2845                 goto out;
2846
2847         nfsd4_encode_stateid(resp, &open->op_stateid);
2848         RESERVE_SPACE(40);
2849         write_cinfo(&p, &open->op_cinfo);
2850         WRITE32(open->op_rflags);
2851         WRITE32(2);
2852         WRITE32(open->op_bmval[0]);
2853         WRITE32(open->op_bmval[1]);
2854         WRITE32(open->op_delegate_type);
2855         ADJUST_ARGS();
2856
2857         switch (open->op_delegate_type) {
2858         case NFS4_OPEN_DELEGATE_NONE:
2859                 break;
2860         case NFS4_OPEN_DELEGATE_READ:
2861                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2862                 RESERVE_SPACE(20);
2863                 WRITE32(open->op_recall);
2864
2865                 /*
2866                  * TODO: ACE's in delegations
2867                  */
2868                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2869                 WRITE32(0);
2870                 WRITE32(0);
2871                 WRITE32(0);   /* XXX: is NULL principal ok? */
2872                 ADJUST_ARGS();
2873                 break;
2874         case NFS4_OPEN_DELEGATE_WRITE:
2875                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2876                 RESERVE_SPACE(32);
2877                 WRITE32(0);
2878
2879                 /*
2880                  * TODO: space_limit's in delegations
2881                  */
2882                 WRITE32(NFS4_LIMIT_SIZE);
2883                 WRITE32(~(u32)0);
2884                 WRITE32(~(u32)0);
2885
2886                 /*
2887                  * TODO: ACE's in delegations
2888                  */
2889                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2890                 WRITE32(0);
2891                 WRITE32(0);
2892                 WRITE32(0);   /* XXX: is NULL principal ok? */
2893                 ADJUST_ARGS();
2894                 break;
2895         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2896                 switch (open->op_why_no_deleg) {
2897                 case WND4_CONTENTION:
2898                 case WND4_RESOURCE:
2899                         RESERVE_SPACE(8);
2900                         WRITE32(open->op_why_no_deleg);
2901                         WRITE32(0);     /* deleg signaling not supported yet */
2902                         break;
2903                 default:
2904                         RESERVE_SPACE(4);
2905                         WRITE32(open->op_why_no_deleg);
2906                 }
2907                 ADJUST_ARGS();
2908                 break;
2909         default:
2910                 BUG();
2911         }
2912         /* XXX save filehandle here */
2913 out:
2914         encode_seqid_op_tail(resp, save, nfserr);
2915         return nfserr;
2916 }
2917
2918 static __be32
2919 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2920 {
2921         ENCODE_SEQID_OP_HEAD;
2922
2923         if (!nfserr)
2924                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2925
2926         encode_seqid_op_tail(resp, save, nfserr);
2927         return nfserr;
2928 }
2929
2930 static __be32
2931 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2932 {
2933         ENCODE_SEQID_OP_HEAD;
2934
2935         if (!nfserr)
2936                 nfsd4_encode_stateid(resp, &od->od_stateid);
2937
2938         encode_seqid_op_tail(resp, save, nfserr);
2939         return nfserr;
2940 }
2941
2942 static __be32
2943 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2944                   struct nfsd4_read *read)
2945 {
2946         u32 eof;
2947         int v, pn;
2948         unsigned long maxcount;
2949         long len;
2950         __be32 *p;
2951
2952         if (nfserr)
2953                 return nfserr;
2954         if (resp->xbuf->page_len)
2955                 return nfserr_resource;
2956
2957         RESERVE_SPACE(8); /* eof flag and byte count */
2958
2959         maxcount = svc_max_payload(resp->rqstp);
2960         if (maxcount > read->rd_length)
2961                 maxcount = read->rd_length;
2962
2963         len = maxcount;
2964         v = 0;
2965         while (len > 0) {
2966                 pn = resp->rqstp->rq_resused++;
2967                 resp->rqstp->rq_vec[v].iov_base =
2968                         page_address(resp->rqstp->rq_respages[pn]);
2969                 resp->rqstp->rq_vec[v].iov_len =
2970                         len < PAGE_SIZE ? len : PAGE_SIZE;
2971                 v++;
2972                 len -= PAGE_SIZE;
2973         }
2974         read->rd_vlen = v;
2975
2976         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2977                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2978                         &maxcount);
2979
2980         if (nfserr)
2981                 return nfserr;
2982         eof = (read->rd_offset + maxcount >=
2983                read->rd_fhp->fh_dentry->d_inode->i_size);
2984
2985         WRITE32(eof);
2986         WRITE32(maxcount);
2987         ADJUST_ARGS();
2988         resp->xbuf->head[0].iov_len = (char*)p
2989                                         - (char*)resp->xbuf->head[0].iov_base;
2990         resp->xbuf->page_len = maxcount;
2991
2992         /* Use rest of head for padding and remaining ops: */
2993         resp->xbuf->tail[0].iov_base = p;
2994         resp->xbuf->tail[0].iov_len = 0;
2995         if (maxcount&3) {
2996                 RESERVE_SPACE(4);
2997                 WRITE32(0);
2998                 resp->xbuf->tail[0].iov_base += maxcount&3;
2999                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3000                 ADJUST_ARGS();
3001         }
3002         return 0;
3003 }
3004
3005 static __be32
3006 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3007 {
3008         int maxcount;
3009         char *page;
3010         __be32 *p;
3011
3012         if (nfserr)
3013                 return nfserr;
3014         if (resp->xbuf->page_len)
3015                 return nfserr_resource;
3016
3017         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3018
3019         maxcount = PAGE_SIZE;
3020         RESERVE_SPACE(4);
3021
3022         /*
3023          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3024          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3025          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3026          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3027          */
3028         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3029         if (nfserr == nfserr_isdir)
3030                 return nfserr_inval;
3031         if (nfserr)
3032                 return nfserr;
3033
3034         WRITE32(maxcount);
3035         ADJUST_ARGS();
3036         resp->xbuf->head[0].iov_len = (char*)p
3037                                 - (char*)resp->xbuf->head[0].iov_base;
3038         resp->xbuf->page_len = maxcount;
3039
3040         /* Use rest of head for padding and remaining ops: */
3041         resp->xbuf->tail[0].iov_base = p;
3042         resp->xbuf->tail[0].iov_len = 0;
3043         if (maxcount&3) {
3044                 RESERVE_SPACE(4);
3045                 WRITE32(0);
3046                 resp->xbuf->tail[0].iov_base += maxcount&3;
3047                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3048                 ADJUST_ARGS();
3049         }
3050         return 0;
3051 }
3052
3053 static __be32
3054 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3055 {
3056         int maxcount;
3057         loff_t offset;
3058         __be32 *page, *savep, *tailbase;
3059         __be32 *p;
3060
3061         if (nfserr)
3062                 return nfserr;
3063         if (resp->xbuf->page_len)
3064                 return nfserr_resource;
3065
3066         RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3067         savep = p;
3068
3069         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3070         WRITE32(0);
3071         WRITE32(0);
3072         ADJUST_ARGS();
3073         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3074         tailbase = p;
3075
3076         maxcount = PAGE_SIZE;
3077         if (maxcount > readdir->rd_maxcount)
3078                 maxcount = readdir->rd_maxcount;
3079
3080         /*
3081          * Convert from bytes to words, account for the two words already
3082          * written, make sure to leave two words at the end for the next
3083          * pointer and eof field.
3084          */
3085         maxcount = (maxcount >> 2) - 4;
3086         if (maxcount < 0) {
3087                 nfserr =  nfserr_toosmall;
3088                 goto err_no_verf;
3089         }
3090
3091         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3092         readdir->common.err = 0;
3093         readdir->buflen = maxcount;
3094         readdir->buffer = page;
3095         readdir->offset = NULL;
3096
3097         offset = readdir->rd_cookie;
3098         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3099                               &offset,
3100                               &readdir->common, nfsd4_encode_dirent);
3101         if (nfserr == nfs_ok &&
3102             readdir->common.err == nfserr_toosmall &&
3103             readdir->buffer == page)
3104                 nfserr = nfserr_toosmall;
3105         if (nfserr)
3106                 goto err_no_verf;
3107
3108         if (readdir->offset)
3109                 xdr_encode_hyper(readdir->offset, offset);
3110
3111         p = readdir->buffer;
3112         *p++ = 0;       /* no more entries */
3113         *p++ = htonl(readdir->common.err == nfserr_eof);
3114         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
3115                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
3116
3117         /* Use rest of head for padding and remaining ops: */
3118         resp->xbuf->tail[0].iov_base = tailbase;
3119         resp->xbuf->tail[0].iov_len = 0;
3120         resp->p = resp->xbuf->tail[0].iov_base;
3121         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3122
3123         return 0;
3124 err_no_verf:
3125         p = savep;
3126         ADJUST_ARGS();
3127         return nfserr;
3128 }
3129
3130 static __be32
3131 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3132 {
3133         __be32 *p;
3134
3135         if (!nfserr) {
3136                 RESERVE_SPACE(20);
3137                 write_cinfo(&p, &remove->rm_cinfo);
3138                 ADJUST_ARGS();
3139         }
3140         return nfserr;
3141 }
3142
3143 static __be32
3144 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3145 {
3146         __be32 *p;
3147
3148         if (!nfserr) {
3149                 RESERVE_SPACE(40);
3150                 write_cinfo(&p, &rename->rn_sinfo);
3151                 write_cinfo(&p, &rename->rn_tinfo);
3152                 ADJUST_ARGS();
3153         }
3154         return nfserr;
3155 }
3156
3157 static __be32
3158 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3159                          __be32 nfserr,struct svc_export *exp)
3160 {
3161         int i = 0;
3162         u32 nflavs;
3163         struct exp_flavor_info *flavs;
3164         struct exp_flavor_info def_flavs[2];
3165         __be32 *p;
3166
3167         if (nfserr)
3168                 goto out;
3169         if (exp->ex_nflavors) {
3170                 flavs = exp->ex_flavors;
3171                 nflavs = exp->ex_nflavors;
3172         } else { /* Handling of some defaults in absence of real secinfo: */
3173                 flavs = def_flavs;
3174                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3175                         nflavs = 2;
3176                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3177                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3178                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3179                         nflavs = 1;
3180                         flavs[0].pseudoflavor
3181                                         = svcauth_gss_flavor(exp->ex_client);
3182                 } else {
3183                         nflavs = 1;
3184                         flavs[0].pseudoflavor
3185                                         = exp->ex_client->flavour->flavour;
3186                 }
3187         }
3188
3189         RESERVE_SPACE(4);
3190         WRITE32(nflavs);
3191         ADJUST_ARGS();
3192         for (i = 0; i < nflavs; i++) {
3193                 u32 flav = flavs[i].pseudoflavor;
3194                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
3195
3196                 if (gm) {
3197                         RESERVE_SPACE(4);
3198                         WRITE32(RPC_AUTH_GSS);
3199                         ADJUST_ARGS();
3200                         RESERVE_SPACE(4 + gm->gm_oid.len);
3201                         WRITE32(gm->gm_oid.len);
3202                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
3203                         ADJUST_ARGS();
3204                         RESERVE_SPACE(4);
3205                         WRITE32(0); /* qop */
3206                         ADJUST_ARGS();
3207                         RESERVE_SPACE(4);
3208                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
3209                         ADJUST_ARGS();
3210                         gss_mech_put(gm);
3211                 } else {
3212                         RESERVE_SPACE(4);
3213                         WRITE32(flav);
3214                         ADJUST_ARGS();
3215                 }
3216         }
3217 out:
3218         if (exp)
3219                 exp_put(exp);
3220         return nfserr;
3221 }
3222
3223 static __be32
3224 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3225                      struct nfsd4_secinfo *secinfo)
3226 {
3227         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3228 }
3229
3230 static __be32
3231 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3232                      struct nfsd4_secinfo_no_name *secinfo)
3233 {
3234         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3235 }
3236
3237 /*
3238  * The SETATTR encode routine is special -- it always encodes a bitmap,
3239  * regardless of the error status.
3240  */
3241 static __be32
3242 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3243 {
3244         __be32 *p;
3245
3246         RESERVE_SPACE(12);
3247         if (nfserr) {
3248                 WRITE32(2);
3249                 WRITE32(0);
3250                 WRITE32(0);
3251         }
3252         else {
3253                 WRITE32(2);
3254                 WRITE32(setattr->sa_bmval[0]);
3255                 WRITE32(setattr->sa_bmval[1]);
3256         }
3257         ADJUST_ARGS();
3258         return nfserr;
3259 }
3260
3261 static __be32
3262 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3263 {
3264         __be32 *p;
3265
3266         if (!nfserr) {
3267                 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3268                 WRITEMEM(&scd->se_clientid, 8);
3269                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3270                 ADJUST_ARGS();
3271         }
3272         else if (nfserr == nfserr_clid_inuse) {
3273                 RESERVE_SPACE(8);
3274                 WRITE32(0);
3275                 WRITE32(0);
3276                 ADJUST_ARGS();
3277         }
3278         return nfserr;
3279 }
3280
3281 static __be32
3282 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3283 {
3284         __be32 *p;
3285
3286         if (!nfserr) {
3287                 RESERVE_SPACE(16);
3288                 WRITE32(write->wr_bytes_written);
3289                 WRITE32(write->wr_how_written);
3290                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3291                 ADJUST_ARGS();
3292         }
3293         return nfserr;
3294 }
3295
3296 static __be32
3297 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3298                          struct nfsd4_exchange_id *exid)
3299 {
3300         __be32 *p;
3301         char *major_id;
3302         char *server_scope;
3303         int major_id_sz;
3304         int server_scope_sz;
3305         uint64_t minor_id = 0;
3306
3307         if (nfserr)
3308                 return nfserr;
3309
3310         major_id = utsname()->nodename;
3311         major_id_sz = strlen(major_id);
3312         server_scope = utsname()->nodename;
3313         server_scope_sz = strlen(server_scope);
3314
3315         RESERVE_SPACE(
3316                 8 /* eir_clientid */ +
3317                 4 /* eir_sequenceid */ +
3318                 4 /* eir_flags */ +
3319                 4 /* spr_how (SP4_NONE) */ +
3320                 8 /* so_minor_id */ +
3321                 4 /* so_major_id.len */ +
3322                 (XDR_QUADLEN(major_id_sz) * 4) +
3323                 4 /* eir_server_scope.len */ +
3324                 (XDR_QUADLEN(server_scope_sz) * 4) +
3325                 4 /* eir_server_impl_id.count (0) */);
3326
3327         WRITEMEM(&exid->clientid, 8);
3328         WRITE32(exid->seqid);
3329         WRITE32(exid->flags);
3330
3331         /* state_protect4_r. Currently only support SP4_NONE */
3332         BUG_ON(exid->spa_how != SP4_NONE);
3333         WRITE32(exid->spa_how);
3334
3335         /* The server_owner struct */
3336         WRITE64(minor_id);      /* Minor id */
3337         /* major id */
3338         WRITE32(major_id_sz);
3339         WRITEMEM(major_id, major_id_sz);
3340
3341         /* Server scope */
3342         WRITE32(server_scope_sz);
3343         WRITEMEM(server_scope, server_scope_sz);
3344
3345         /* Implementation id */
3346         WRITE32(0);     /* zero length nfs_impl_id4 array */
3347         ADJUST_ARGS();
3348         return 0;
3349 }
3350
3351 static __be32
3352 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3353                             struct nfsd4_create_session *sess)
3354 {
3355         __be32 *p;
3356
3357         if (nfserr)
3358                 return nfserr;
3359
3360         RESERVE_SPACE(24);
3361         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3362         WRITE32(sess->seqid);
3363         WRITE32(sess->flags);
3364         ADJUST_ARGS();
3365
3366         RESERVE_SPACE(28);
3367         WRITE32(0); /* headerpadsz */
3368         WRITE32(sess->fore_channel.maxreq_sz);
3369         WRITE32(sess->fore_channel.maxresp_sz);
3370         WRITE32(sess->fore_channel.maxresp_cached);
3371         WRITE32(sess->fore_channel.maxops);
3372         WRITE32(sess->fore_channel.maxreqs);
3373         WRITE32(sess->fore_channel.nr_rdma_attrs);
3374         ADJUST_ARGS();
3375
3376         if (sess->fore_channel.nr_rdma_attrs) {
3377                 RESERVE_SPACE(4);
3378                 WRITE32(sess->fore_channel.rdma_attrs);
3379                 ADJUST_ARGS();
3380         }
3381
3382         RESERVE_SPACE(28);
3383         WRITE32(0); /* headerpadsz */
3384         WRITE32(sess->back_channel.maxreq_sz);
3385         WRITE32(sess->back_channel.maxresp_sz);
3386         WRITE32(sess->back_channel.maxresp_cached);
3387         WRITE32(sess->back_channel.maxops);
3388         WRITE32(sess->back_channel.maxreqs);
3389         WRITE32(sess->back_channel.nr_rdma_attrs);
3390         ADJUST_ARGS();
3391
3392         if (sess->back_channel.nr_rdma_attrs) {
3393                 RESERVE_SPACE(4);
3394                 WRITE32(sess->back_channel.rdma_attrs);
3395                 ADJUST_ARGS();
3396         }
3397         return 0;
3398 }
3399
3400 static __be32
3401 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3402                              struct nfsd4_destroy_session *destroy_session)
3403 {
3404         return nfserr;
3405 }
3406
3407 static __be32
3408 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3409                           struct nfsd4_free_stateid *free_stateid)
3410 {
3411         __be32 *p;
3412
3413         if (nfserr)
3414                 return nfserr;
3415
3416         RESERVE_SPACE(4);
3417         *p++ = nfserr;
3418         ADJUST_ARGS();
3419         return nfserr;
3420 }
3421
3422 static __be32
3423 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3424                       struct nfsd4_sequence *seq)
3425 {
3426         __be32 *p;
3427
3428         if (nfserr)
3429                 return nfserr;
3430
3431         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3432         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3433         WRITE32(seq->seqid);
3434         WRITE32(seq->slotid);
3435         /* Note slotid's are numbered from zero: */
3436         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3437         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3438         WRITE32(seq->status_flags);
3439
3440         ADJUST_ARGS();
3441         resp->cstate.datap = p; /* DRC cache data pointer */
3442         return 0;
3443 }
3444
3445 static __be32
3446 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3447                           struct nfsd4_test_stateid *test_stateid)
3448 {
3449         struct nfsd4_test_stateid_id *stateid, *next;
3450         __be32 *p;
3451
3452         RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3453         *p++ = htonl(test_stateid->ts_num_ids);
3454
3455         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3456                 *p++ = stateid->ts_id_status;
3457         }
3458
3459         ADJUST_ARGS();
3460         return nfserr;
3461 }
3462
3463 static __be32
3464 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3465 {
3466         return nfserr;
3467 }
3468
3469 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3470
3471 /*
3472  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3473  * since we don't need to filter out obsolete ops as this is
3474  * done in the decoding phase.
3475  */
3476 static nfsd4_enc nfsd4_enc_ops[] = {
3477         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3478         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3479         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3480         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3481         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3482         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3483         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3484         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3485         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3486         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3487         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3488         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3489         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3490         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3491         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3492         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3493         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3494         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3495         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3496         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3497         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3498         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3499         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3500         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3501         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3502         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3503         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3504         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3505         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3506         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3507         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3508         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3509         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3510         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3511         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3512         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3513         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3514
3515         /* NFSv4.1 operations */
3516         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3517         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3518         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3519         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3520         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3521         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3522         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3523         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3524         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3525         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3526         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3527         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3528         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3529         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3530         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3531         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3532         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3533         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3534         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3535 };
3536
3537 /*
3538  * Calculate the total amount of memory that the compound response has taken
3539  * after encoding the current operation with pad.
3540  *
3541  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3542  *      which was specified at nfsd4_operation, else pad is zero.
3543  *
3544  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3545  *
3546  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3547  * will be at least a page and will therefore hold the xdr_buf head.
3548  */
3549 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3550 {
3551         struct xdr_buf *xb = &resp->rqstp->rq_res;
3552         struct nfsd4_session *session = NULL;
3553         struct nfsd4_slot *slot = resp->cstate.slot;
3554         u32 length, tlen = 0;
3555
3556         if (!nfsd4_has_session(&resp->cstate))
3557                 return 0;
3558
3559         session = resp->cstate.session;
3560         if (session == NULL)
3561                 return 0;
3562
3563         if (xb->page_len == 0) {
3564                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3565         } else {
3566                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3567                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3568
3569                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3570         }
3571         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3572                 length, xb->page_len, tlen, pad);
3573
3574         if (length > session->se_fchannel.maxresp_sz)
3575                 return nfserr_rep_too_big;
3576
3577         if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3578             length > session->se_fchannel.maxresp_cached)
3579                 return nfserr_rep_too_big_to_cache;
3580
3581         return 0;
3582 }
3583
3584 void
3585 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3586 {
3587         __be32 *statp;
3588         __be32 *p;
3589
3590         RESERVE_SPACE(8);
3591         WRITE32(op->opnum);
3592         statp = p++;    /* to be backfilled at the end */
3593         ADJUST_ARGS();
3594
3595         if (op->opnum == OP_ILLEGAL)
3596                 goto status;
3597         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3598                !nfsd4_enc_ops[op->opnum]);
3599         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3600         /* nfsd4_check_drc_limit guarantees enough room for error status */
3601         if (!op->status)
3602                 op->status = nfsd4_check_resp_size(resp, 0);
3603 status:
3604         /*
3605          * Note: We write the status directly, instead of using WRITE32(),
3606          * since it is already in network byte order.
3607          */
3608         *statp = op->status;
3609 }
3610
3611 /*
3612  * Encode the reply stored in the stateowner reply cache
3613  *
3614  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3615  * previously sent already encoded operation.
3616  *
3617  * called with nfs4_lock_state() held
3618  */
3619 void
3620 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3621 {
3622         __be32 *p;
3623         struct nfs4_replay *rp = op->replay;
3624
3625         BUG_ON(!rp);
3626
3627         RESERVE_SPACE(8);
3628         WRITE32(op->opnum);
3629         *p++ = rp->rp_status;  /* already xdr'ed */
3630         ADJUST_ARGS();
3631
3632         RESERVE_SPACE(rp->rp_buflen);
3633         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3634         ADJUST_ARGS();
3635 }
3636
3637 int
3638 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3639 {
3640         return xdr_ressize_check(rqstp, p);
3641 }
3642
3643 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3644 {
3645         struct svc_rqst *rqstp = rq;
3646         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3647
3648         if (args->ops != args->iops) {
3649                 kfree(args->ops);
3650                 args->ops = args->iops;
3651         }
3652         kfree(args->tmpp);
3653         args->tmpp = NULL;
3654         while (args->to_free) {
3655                 struct tmpbuf *tb = args->to_free;
3656                 args->to_free = tb->next;
3657                 tb->release(tb->buf);
3658                 kfree(tb);
3659         }
3660         return 1;
3661 }
3662
3663 int
3664 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3665 {
3666         args->p = p;
3667         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3668         args->pagelist = rqstp->rq_arg.pages;
3669         args->pagelen = rqstp->rq_arg.page_len;
3670         args->tmpp = NULL;
3671         args->to_free = NULL;
3672         args->ops = args->iops;
3673         args->rqstp = rqstp;
3674
3675         return !nfsd4_decode_compound(args);
3676 }
3677
3678 int
3679 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3680 {
3681         /*
3682          * All that remains is to write the tag and operation count...
3683          */
3684         struct nfsd4_compound_state *cs = &resp->cstate;
3685         struct kvec *iov;
3686         p = resp->tagp;
3687         *p++ = htonl(resp->taglen);
3688         memcpy(p, resp->tag, resp->taglen);
3689         p += XDR_QUADLEN(resp->taglen);
3690         *p++ = htonl(resp->opcnt);
3691
3692         if (rqstp->rq_res.page_len)
3693                 iov = &rqstp->rq_res.tail[0];
3694         else
3695                 iov = &rqstp->rq_res.head[0];
3696         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3697         BUG_ON(iov->iov_len > PAGE_SIZE);
3698         if (nfsd4_has_session(cs)) {
3699                 if (cs->status != nfserr_replay_cache) {
3700                         nfsd4_store_cache_entry(resp);
3701                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3702                 }
3703                 /* Renew the clientid on success and on replay */
3704                 release_session_client(cs->session);
3705                 nfsd4_put_session(cs->session);
3706         }
3707         return 1;
3708 }
3709
3710 /*
3711  * Local variables:
3712  *  c-basic-offset: 8
3713  * End:
3714  */