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 nfsd4_write *write)
1143 {
1144         int i = 1;
1145         int buflen = write->wr_buflen;
1146
1147         vec[0].iov_base = write->wr_head.iov_base;
1148         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
1149         buflen -= vec[0].iov_len;
1150
1151         while (buflen) {
1152                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
1153                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
1154                 buflen -= vec[i].iov_len;
1155                 i++;
1156         }
1157         return i;
1158 }
1159
1160 static __be32
1161 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1162 {
1163         int avail;
1164         int len;
1165         DECODE_HEAD;
1166
1167         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1168         if (status)
1169                 return status;
1170         READ_BUF(16);
1171         READ64(write->wr_offset);
1172         READ32(write->wr_stable_how);
1173         if (write->wr_stable_how > 2)
1174                 goto xdr_error;
1175         READ32(write->wr_buflen);
1176
1177         /* Sorry .. no magic macros for this.. *
1178          * READ_BUF(write->wr_buflen);
1179          * SAVEMEM(write->wr_buf, write->wr_buflen);
1180          */
1181         avail = (char*)argp->end - (char*)argp->p;
1182         if (avail + argp->pagelen < write->wr_buflen) {
1183                 dprintk("NFSD: xdr error (%s:%d)\n",
1184                                 __FILE__, __LINE__);
1185                 goto xdr_error;
1186         }
1187         write->wr_head.iov_base = p;
1188         write->wr_head.iov_len = avail;
1189         WARN_ON(avail != (XDR_QUADLEN(avail) << 2));
1190         write->wr_pagelist = argp->pagelist;
1191
1192         len = XDR_QUADLEN(write->wr_buflen) << 2;
1193         if (len >= avail) {
1194                 int pages;
1195
1196                 len -= avail;
1197
1198                 pages = len >> PAGE_SHIFT;
1199                 argp->pagelist += pages;
1200                 argp->pagelen -= pages * PAGE_SIZE;
1201                 len -= pages * PAGE_SIZE;
1202
1203                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1204                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1205         }
1206         argp->p += XDR_QUADLEN(len);
1207         write->wr_vlen = fill_in_write_vector(argp->rqstp->rq_vec, write);
1208         WARN_ON_ONCE(write->wr_vlen > ARRAY_SIZE(argp->rqstp->rq_vec));
1209
1210         DECODE_TAIL;
1211 }
1212
1213 static __be32
1214 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1215 {
1216         DECODE_HEAD;
1217
1218         READ_BUF(12);
1219         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1220         READ32(rlockowner->rl_owner.len);
1221         READ_BUF(rlockowner->rl_owner.len);
1222         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1223
1224         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1225                 return nfserr_inval;
1226         DECODE_TAIL;
1227 }
1228
1229 static __be32
1230 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1231                          struct nfsd4_exchange_id *exid)
1232 {
1233         int dummy, tmp;
1234         DECODE_HEAD;
1235
1236         READ_BUF(NFS4_VERIFIER_SIZE);
1237         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1238
1239         status = nfsd4_decode_opaque(argp, &exid->clname);
1240         if (status)
1241                 return nfserr_bad_xdr;
1242
1243         READ_BUF(4);
1244         READ32(exid->flags);
1245
1246         /* Ignore state_protect4_a */
1247         READ_BUF(4);
1248         READ32(exid->spa_how);
1249         switch (exid->spa_how) {
1250         case SP4_NONE:
1251                 break;
1252         case SP4_MACH_CRED:
1253                 /* spo_must_enforce */
1254                 READ_BUF(4);
1255                 READ32(dummy);
1256                 READ_BUF(dummy * 4);
1257                 p += dummy;
1258
1259                 /* spo_must_allow */
1260                 READ_BUF(4);
1261                 READ32(dummy);
1262                 READ_BUF(dummy * 4);
1263                 p += dummy;
1264                 break;
1265         case SP4_SSV:
1266                 /* ssp_ops */
1267                 READ_BUF(4);
1268                 READ32(dummy);
1269                 READ_BUF(dummy * 4);
1270                 p += dummy;
1271
1272                 READ_BUF(4);
1273                 READ32(dummy);
1274                 READ_BUF(dummy * 4);
1275                 p += dummy;
1276
1277                 /* ssp_hash_algs<> */
1278                 READ_BUF(4);
1279                 READ32(tmp);
1280                 while (tmp--) {
1281                         READ_BUF(4);
1282                         READ32(dummy);
1283                         READ_BUF(dummy);
1284                         p += XDR_QUADLEN(dummy);
1285                 }
1286
1287                 /* ssp_encr_algs<> */
1288                 READ_BUF(4);
1289                 READ32(tmp);
1290                 while (tmp--) {
1291                         READ_BUF(4);
1292                         READ32(dummy);
1293                         READ_BUF(dummy);
1294                         p += XDR_QUADLEN(dummy);
1295                 }
1296
1297                 /* ssp_window and ssp_num_gss_handles */
1298                 READ_BUF(8);
1299                 READ32(dummy);
1300                 READ32(dummy);
1301                 break;
1302         default:
1303                 goto xdr_error;
1304         }
1305
1306         /* Ignore Implementation ID */
1307         READ_BUF(4);    /* nfs_impl_id4 array length */
1308         READ32(dummy);
1309
1310         if (dummy > 1)
1311                 goto xdr_error;
1312
1313         if (dummy == 1) {
1314                 /* nii_domain */
1315                 READ_BUF(4);
1316                 READ32(dummy);
1317                 READ_BUF(dummy);
1318                 p += XDR_QUADLEN(dummy);
1319
1320                 /* nii_name */
1321                 READ_BUF(4);
1322                 READ32(dummy);
1323                 READ_BUF(dummy);
1324                 p += XDR_QUADLEN(dummy);
1325
1326                 /* nii_date */
1327                 READ_BUF(12);
1328                 p += 3;
1329         }
1330         DECODE_TAIL;
1331 }
1332
1333 static __be32
1334 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1335                             struct nfsd4_create_session *sess)
1336 {
1337         DECODE_HEAD;
1338         u32 dummy;
1339
1340         READ_BUF(16);
1341         COPYMEM(&sess->clientid, 8);
1342         READ32(sess->seqid);
1343         READ32(sess->flags);
1344
1345         /* Fore channel attrs */
1346         READ_BUF(28);
1347         READ32(dummy); /* headerpadsz is always 0 */
1348         READ32(sess->fore_channel.maxreq_sz);
1349         READ32(sess->fore_channel.maxresp_sz);
1350         READ32(sess->fore_channel.maxresp_cached);
1351         READ32(sess->fore_channel.maxops);
1352         READ32(sess->fore_channel.maxreqs);
1353         READ32(sess->fore_channel.nr_rdma_attrs);
1354         if (sess->fore_channel.nr_rdma_attrs == 1) {
1355                 READ_BUF(4);
1356                 READ32(sess->fore_channel.rdma_attrs);
1357         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1358                 dprintk("Too many fore channel attr bitmaps!\n");
1359                 goto xdr_error;
1360         }
1361
1362         /* Back channel attrs */
1363         READ_BUF(28);
1364         READ32(dummy); /* headerpadsz is always 0 */
1365         READ32(sess->back_channel.maxreq_sz);
1366         READ32(sess->back_channel.maxresp_sz);
1367         READ32(sess->back_channel.maxresp_cached);
1368         READ32(sess->back_channel.maxops);
1369         READ32(sess->back_channel.maxreqs);
1370         READ32(sess->back_channel.nr_rdma_attrs);
1371         if (sess->back_channel.nr_rdma_attrs == 1) {
1372                 READ_BUF(4);
1373                 READ32(sess->back_channel.rdma_attrs);
1374         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1375                 dprintk("Too many back channel attr bitmaps!\n");
1376                 goto xdr_error;
1377         }
1378
1379         READ_BUF(4);
1380         READ32(sess->callback_prog);
1381         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1382         DECODE_TAIL;
1383 }
1384
1385 static __be32
1386 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1387                              struct nfsd4_destroy_session *destroy_session)
1388 {
1389         DECODE_HEAD;
1390         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1391         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1392
1393         DECODE_TAIL;
1394 }
1395
1396 static __be32
1397 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1398                           struct nfsd4_free_stateid *free_stateid)
1399 {
1400         DECODE_HEAD;
1401
1402         READ_BUF(sizeof(stateid_t));
1403         READ32(free_stateid->fr_stateid.si_generation);
1404         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1405
1406         DECODE_TAIL;
1407 }
1408
1409 static __be32
1410 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1411                       struct nfsd4_sequence *seq)
1412 {
1413         DECODE_HEAD;
1414
1415         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1416         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1417         READ32(seq->seqid);
1418         READ32(seq->slotid);
1419         READ32(seq->maxslots);
1420         READ32(seq->cachethis);
1421
1422         DECODE_TAIL;
1423 }
1424
1425 static __be32
1426 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1427 {
1428         int i;
1429         __be32 *p, status;
1430         struct nfsd4_test_stateid_id *stateid;
1431
1432         READ_BUF(4);
1433         test_stateid->ts_num_ids = ntohl(*p++);
1434
1435         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1436
1437         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1438                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1439                 if (!stateid) {
1440                         status = nfserrno(-ENOMEM);
1441                         goto out;
1442                 }
1443
1444                 defer_free(argp, kfree, stateid);
1445                 INIT_LIST_HEAD(&stateid->ts_id_list);
1446                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1447
1448                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1449                 if (status)
1450                         goto out;
1451         }
1452
1453         status = 0;
1454 out:
1455         return status;
1456 xdr_error:
1457         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1458         status = nfserr_bad_xdr;
1459         goto out;
1460 }
1461
1462 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1463 {
1464         DECODE_HEAD;
1465
1466         READ_BUF(8);
1467         COPYMEM(&dc->clientid, 8);
1468
1469         DECODE_TAIL;
1470 }
1471
1472 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1473 {
1474         DECODE_HEAD;
1475
1476         READ_BUF(4);
1477         READ32(rc->rca_one_fs);
1478
1479         DECODE_TAIL;
1480 }
1481
1482 static __be32
1483 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1484 {
1485         return nfs_ok;
1486 }
1487
1488 static __be32
1489 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1490 {
1491         return nfserr_notsupp;
1492 }
1493
1494 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1495
1496 static nfsd4_dec nfsd4_dec_ops[] = {
1497         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1498         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1499         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1500         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1501         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1502         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1503         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1504         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1505         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1506         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1507         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1508         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1509         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1510         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1511         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1512         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1513         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1514         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1515         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1516         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1517         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1518         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1519         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1520         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1521         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1522         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1523         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1524         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1525         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1526         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1527         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1528         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1529         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1530         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1531         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1532         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1533         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1534 };
1535
1536 static nfsd4_dec nfsd41_dec_ops[] = {
1537         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1538         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1539         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1540         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1541         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1542         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1543         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1544         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1545         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1546         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1547         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1548         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1549         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1550         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1551         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1552         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1553         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1554         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1555         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1556         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1557         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1558         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1559         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1560         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1561         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1562         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1563         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1564         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1565         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1566         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1567         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1568         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1569         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1570         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1571         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1572         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1573         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1574
1575         /* new operations for NFSv4.1 */
1576         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1577         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1578         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1579         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1580         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1581         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1582         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1583         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1584         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1585         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1586         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1587         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1588         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1589         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1590         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1591         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1592         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1593         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1594         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1595 };
1596
1597 struct nfsd4_minorversion_ops {
1598         nfsd4_dec *decoders;
1599         int nops;
1600 };
1601
1602 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1603         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1604         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1605 };
1606
1607 static __be32
1608 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1609 {
1610         DECODE_HEAD;
1611         struct nfsd4_op *op;
1612         struct nfsd4_minorversion_ops *ops;
1613         bool cachethis = false;
1614         int i;
1615
1616         READ_BUF(4);
1617         READ32(argp->taglen);
1618         READ_BUF(argp->taglen + 8);
1619         SAVEMEM(argp->tag, argp->taglen);
1620         READ32(argp->minorversion);
1621         READ32(argp->opcnt);
1622
1623         if (argp->taglen > NFSD4_MAX_TAGLEN)
1624                 goto xdr_error;
1625         if (argp->opcnt > 100)
1626                 goto xdr_error;
1627
1628         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1629                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1630                 if (!argp->ops) {
1631                         argp->ops = argp->iops;
1632                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1633                         goto xdr_error;
1634                 }
1635         }
1636
1637         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1638                 argp->opcnt = 0;
1639
1640         ops = &nfsd4_minorversion[argp->minorversion];
1641         for (i = 0; i < argp->opcnt; i++) {
1642                 op = &argp->ops[i];
1643                 op->replay = NULL;
1644
1645                 READ_BUF(4);
1646                 READ32(op->opnum);
1647
1648                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1649                         op->status = ops->decoders[op->opnum](argp, &op->u);
1650                 else {
1651                         op->opnum = OP_ILLEGAL;
1652                         op->status = nfserr_op_illegal;
1653                 }
1654
1655                 if (op->status) {
1656                         argp->opcnt = i+1;
1657                         break;
1658                 }
1659                 /*
1660                  * We'll try to cache the result in the DRC if any one
1661                  * op in the compound wants to be cached:
1662                  */
1663                 cachethis |= nfsd4_cache_this_op(op);
1664         }
1665         /* Sessions make the DRC unnecessary: */
1666         if (argp->minorversion)
1667                 cachethis = false;
1668         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1669
1670         DECODE_TAIL;
1671 }
1672
1673 #define WRITE32(n)               *p++ = htonl(n)
1674 #define WRITE64(n)               do {                           \
1675         *p++ = htonl((u32)((n) >> 32));                         \
1676         *p++ = htonl((u32)(n));                                 \
1677 } while (0)
1678 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1679         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1680         memcpy(p, ptr, nbytes);                                 \
1681         p += XDR_QUADLEN(nbytes);                               \
1682 }} while (0)
1683
1684 static void write32(__be32 **p, u32 n)
1685 {
1686         *(*p)++ = htonl(n);
1687 }
1688
1689 static void write64(__be32 **p, u64 n)
1690 {
1691         write32(p, (n >> 32));
1692         write32(p, (u32)n);
1693 }
1694
1695 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1696 {
1697         if (IS_I_VERSION(inode)) {
1698                 write64(p, inode->i_version);
1699         } else {
1700                 write32(p, stat->ctime.tv_sec);
1701                 write32(p, stat->ctime.tv_nsec);
1702         }
1703 }
1704
1705 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1706 {
1707         write32(p, c->atomic);
1708         if (c->change_supported) {
1709                 write64(p, c->before_change);
1710                 write64(p, c->after_change);
1711         } else {
1712                 write32(p, c->before_ctime_sec);
1713                 write32(p, c->before_ctime_nsec);
1714                 write32(p, c->after_ctime_sec);
1715                 write32(p, c->after_ctime_nsec);
1716         }
1717 }
1718
1719 #define RESERVE_SPACE(nbytes)   do {                            \
1720         p = resp->p;                                            \
1721         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1722 } while (0)
1723 #define ADJUST_ARGS()           resp->p = p
1724
1725 /*
1726  * Header routine to setup seqid operation replay cache
1727  */
1728 #define ENCODE_SEQID_OP_HEAD                                    \
1729         __be32 *save;                                           \
1730                                                                 \
1731         save = resp->p;
1732
1733 /*
1734  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1735  * is where sequence id's are incremented, and the replay cache is filled.
1736  * Note that we increment sequence id's here, at the last moment, so we're sure
1737  * we know whether the error to be returned is a sequence id mutating error.
1738  */
1739
1740 static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
1741 {
1742         struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;
1743
1744         if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
1745                 stateowner->so_seqid++;
1746                 stateowner->so_replay.rp_status = nfserr;
1747                 stateowner->so_replay.rp_buflen =
1748                           (char *)resp->p - (char *)save;
1749                 memcpy(stateowner->so_replay.rp_buf, save,
1750                         stateowner->so_replay.rp_buflen);
1751                 nfsd4_purge_closed_stateid(stateowner);
1752         }
1753 }
1754
1755 /* Encode as an array of strings the string given with components
1756  * separated @sep, escaped with esc_enter and esc_exit.
1757  */
1758 static __be32 nfsd4_encode_components_esc(char sep, char *components,
1759                                    __be32 **pp, int *buflen,
1760                                    char esc_enter, char esc_exit)
1761 {
1762         __be32 *p = *pp;
1763         __be32 *countp = p;
1764         int strlen, count=0;
1765         char *str, *end, *next;
1766
1767         dprintk("nfsd4_encode_components(%s)\n", components);
1768         if ((*buflen -= 4) < 0)
1769                 return nfserr_resource;
1770         WRITE32(0); /* We will fill this in with @count later */
1771         end = str = components;
1772         while (*end) {
1773                 bool found_esc = false;
1774
1775                 /* try to parse as esc_start, ..., esc_end, sep */
1776                 if (*str == esc_enter) {
1777                         for (; *end && (*end != esc_exit); end++)
1778                                 /* find esc_exit or end of string */;
1779                         next = end + 1;
1780                         if (*end && (!*next || *next == sep)) {
1781                                 str++;
1782                                 found_esc = true;
1783                         }
1784                 }
1785
1786                 if (!found_esc)
1787                         for (; *end && (*end != sep); end++)
1788                                 /* find sep or end of string */;
1789
1790                 strlen = end - str;
1791                 if (strlen) {
1792                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1793                                 return nfserr_resource;
1794                         WRITE32(strlen);
1795                         WRITEMEM(str, strlen);
1796                         count++;
1797                 }
1798                 else
1799                         end++;
1800                 str = end;
1801         }
1802         *pp = p;
1803         p = countp;
1804         WRITE32(count);
1805         return 0;
1806 }
1807
1808 /* Encode as an array of strings the string given with components
1809  * separated @sep.
1810  */
1811 static __be32 nfsd4_encode_components(char sep, char *components,
1812                                    __be32 **pp, int *buflen)
1813 {
1814         return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1815 }
1816
1817 /*
1818  * encode a location element of a fs_locations structure
1819  */
1820 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1821                                     __be32 **pp, int *buflen)
1822 {
1823         __be32 status;
1824         __be32 *p = *pp;
1825
1826         status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1827                                                 '[', ']');
1828         if (status)
1829                 return status;
1830         status = nfsd4_encode_components('/', location->path, &p, buflen);
1831         if (status)
1832                 return status;
1833         *pp = p;
1834         return 0;
1835 }
1836
1837 /*
1838  * Encode a path in RFC3530 'pathname4' format
1839  */
1840 static __be32 nfsd4_encode_path(const struct path *root,
1841                 const struct path *path, __be32 **pp, int *buflen)
1842 {
1843         struct path cur = {
1844                 .mnt = path->mnt,
1845                 .dentry = path->dentry,
1846         };
1847         __be32 *p = *pp;
1848         struct dentry **components = NULL;
1849         unsigned int ncomponents = 0;
1850         __be32 err = nfserr_jukebox;
1851
1852         dprintk("nfsd4_encode_components(");
1853
1854         path_get(&cur);
1855         /* First walk the path up to the nfsd root, and store the
1856          * dentries/path components in an array.
1857          */
1858         for (;;) {
1859                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1860                         break;
1861                 if (cur.dentry == cur.mnt->mnt_root) {
1862                         if (follow_up(&cur))
1863                                 continue;
1864                         goto out_free;
1865                 }
1866                 if ((ncomponents & 15) == 0) {
1867                         struct dentry **new;
1868                         new = krealloc(components,
1869                                         sizeof(*new) * (ncomponents + 16),
1870                                         GFP_KERNEL);
1871                         if (!new)
1872                                 goto out_free;
1873                         components = new;
1874                 }
1875                 components[ncomponents++] = cur.dentry;
1876                 cur.dentry = dget_parent(cur.dentry);
1877         }
1878
1879         *buflen -= 4;
1880         if (*buflen < 0)
1881                 goto out_free;
1882         WRITE32(ncomponents);
1883
1884         while (ncomponents) {
1885                 struct dentry *dentry = components[ncomponents - 1];
1886                 unsigned int len = dentry->d_name.len;
1887
1888                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1889                 if (*buflen < 0)
1890                         goto out_free;
1891                 WRITE32(len);
1892                 WRITEMEM(dentry->d_name.name, len);
1893                 dprintk("/%s", dentry->d_name.name);
1894                 dput(dentry);
1895                 ncomponents--;
1896         }
1897
1898         *pp = p;
1899         err = 0;
1900 out_free:
1901         dprintk(")\n");
1902         while (ncomponents)
1903                 dput(components[--ncomponents]);
1904         kfree(components);
1905         path_put(&cur);
1906         return err;
1907 }
1908
1909 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1910                 const struct path *path, __be32 **pp, int *buflen)
1911 {
1912         struct svc_export *exp_ps;
1913         __be32 res;
1914
1915         exp_ps = rqst_find_fsidzero_export(rqstp);
1916         if (IS_ERR(exp_ps))
1917                 return nfserrno(PTR_ERR(exp_ps));
1918         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1919         exp_put(exp_ps);
1920         return res;
1921 }
1922
1923 /*
1924  *  encode a fs_locations structure
1925  */
1926 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1927                                      struct svc_export *exp,
1928                                      __be32 **pp, int *buflen)
1929 {
1930         __be32 status;
1931         int i;
1932         __be32 *p = *pp;
1933         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1934
1935         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1936         if (status)
1937                 return status;
1938         if ((*buflen -= 4) < 0)
1939                 return nfserr_resource;
1940         WRITE32(fslocs->locations_count);
1941         for (i=0; i<fslocs->locations_count; i++) {
1942                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1943                                                    &p, buflen);
1944                 if (status)
1945                         return status;
1946         }
1947         *pp = p;
1948         return 0;
1949 }
1950
1951 static u32 nfs4_file_type(umode_t mode)
1952 {
1953         switch (mode & S_IFMT) {
1954         case S_IFIFO:   return NF4FIFO;
1955         case S_IFCHR:   return NF4CHR;
1956         case S_IFDIR:   return NF4DIR;
1957         case S_IFBLK:   return NF4BLK;
1958         case S_IFLNK:   return NF4LNK;
1959         case S_IFREG:   return NF4REG;
1960         case S_IFSOCK:  return NF4SOCK;
1961         default:        return NF4BAD;
1962         };
1963 }
1964
1965 static __be32
1966 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1967                         __be32 **p, int *buflen)
1968 {
1969         int status;
1970
1971         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1972                 return nfserr_resource;
1973         if (whotype != NFS4_ACL_WHO_NAMED)
1974                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1975         else if (group)
1976                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1977         else
1978                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1979         if (status < 0)
1980                 return nfserrno(status);
1981         *p = xdr_encode_opaque(*p, NULL, status);
1982         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1983         BUG_ON(*buflen < 0);
1984         return 0;
1985 }
1986
1987 static inline __be32
1988 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1989 {
1990         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1991 }
1992
1993 static inline __be32
1994 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1995 {
1996         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1997 }
1998
1999 static inline __be32
2000 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
2001                 __be32 **p, int *buflen)
2002 {
2003         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
2004 }
2005
2006 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2007                               FATTR4_WORD0_RDATTR_ERROR)
2008 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2009
2010 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2011 {
2012         /* As per referral draft:  */
2013         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2014             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2015                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2016                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2017                         *rdattr_err = NFSERR_MOVED;
2018                 else
2019                         return nfserr_moved;
2020         }
2021         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2022         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2023         return 0;
2024 }
2025
2026
2027 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2028 {
2029         struct path path = exp->ex_path;
2030         int err;
2031
2032         path_get(&path);
2033         while (follow_up(&path)) {
2034                 if (path.dentry != path.mnt->mnt_root)
2035                         break;
2036         }
2037         err = vfs_getattr(path.mnt, path.dentry, stat);
2038         path_put(&path);
2039         return err;
2040 }
2041
2042 /*
2043  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2044  * ourselves.
2045  *
2046  * @countp is the buffer size in _words_; upon successful return this becomes
2047  * replaced with the number of words written.
2048  */
2049 __be32
2050 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2051                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
2052                 struct svc_rqst *rqstp, int ignore_crossmnt)
2053 {
2054         u32 bmval0 = bmval[0];
2055         u32 bmval1 = bmval[1];
2056         u32 bmval2 = bmval[2];
2057         struct kstat stat;
2058         struct svc_fh tempfh;
2059         struct kstatfs statfs;
2060         int buflen = *countp << 2;
2061         __be32 *attrlenp;
2062         u32 dummy;
2063         u64 dummy64;
2064         u32 rdattr_err = 0;
2065         __be32 *p = buffer;
2066         __be32 status;
2067         int err;
2068         int aclsupport = 0;
2069         struct nfs4_acl *acl = NULL;
2070         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2071         u32 minorversion = resp->cstate.minorversion;
2072         struct path path = {
2073                 .mnt    = exp->ex_path.mnt,
2074                 .dentry = dentry,
2075         };
2076
2077         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2078         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2079         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2080         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2081
2082         if (exp->ex_fslocs.migrated) {
2083                 BUG_ON(bmval[2]);
2084                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2085                 if (status)
2086                         goto out;
2087         }
2088
2089         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
2090         if (err)
2091                 goto out_nfserr;
2092         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2093                         FATTR4_WORD0_MAXNAME)) ||
2094             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2095                        FATTR4_WORD1_SPACE_TOTAL))) {
2096                 err = vfs_statfs(&path, &statfs);
2097                 if (err)
2098                         goto out_nfserr;
2099         }
2100         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2101                 fh_init(&tempfh, NFS4_FHSIZE);
2102                 status = fh_compose(&tempfh, exp, dentry, NULL);
2103                 if (status)
2104                         goto out;
2105                 fhp = &tempfh;
2106         }
2107         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2108                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2109                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2110                 aclsupport = (err == 0);
2111                 if (bmval0 & FATTR4_WORD0_ACL) {
2112                         if (err == -EOPNOTSUPP)
2113                                 bmval0 &= ~FATTR4_WORD0_ACL;
2114                         else if (err == -EINVAL) {
2115                                 status = nfserr_attrnotsupp;
2116                                 goto out;
2117                         } else if (err != 0)
2118                                 goto out_nfserr;
2119                 }
2120         }
2121
2122         if (bmval2) {
2123                 if ((buflen -= 16) < 0)
2124                         goto out_resource;
2125                 WRITE32(3);
2126                 WRITE32(bmval0);
2127                 WRITE32(bmval1);
2128                 WRITE32(bmval2);
2129         } else if (bmval1) {
2130                 if ((buflen -= 12) < 0)
2131                         goto out_resource;
2132                 WRITE32(2);
2133                 WRITE32(bmval0);
2134                 WRITE32(bmval1);
2135         } else {
2136                 if ((buflen -= 8) < 0)
2137                         goto out_resource;
2138                 WRITE32(1);
2139                 WRITE32(bmval0);
2140         }
2141         attrlenp = p++;                /* to be backfilled later */
2142
2143         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2144                 u32 word0 = nfsd_suppattrs0(minorversion);
2145                 u32 word1 = nfsd_suppattrs1(minorversion);
2146                 u32 word2 = nfsd_suppattrs2(minorversion);
2147
2148                 if (!aclsupport)
2149                         word0 &= ~FATTR4_WORD0_ACL;
2150                 if (!word2) {
2151                         if ((buflen -= 12) < 0)
2152                                 goto out_resource;
2153                         WRITE32(2);
2154                         WRITE32(word0);
2155                         WRITE32(word1);
2156                 } else {
2157                         if ((buflen -= 16) < 0)
2158                                 goto out_resource;
2159                         WRITE32(3);
2160                         WRITE32(word0);
2161                         WRITE32(word1);
2162                         WRITE32(word2);
2163                 }
2164         }
2165         if (bmval0 & FATTR4_WORD0_TYPE) {
2166                 if ((buflen -= 4) < 0)
2167                         goto out_resource;
2168                 dummy = nfs4_file_type(stat.mode);
2169                 if (dummy == NF4BAD)
2170                         goto out_serverfault;
2171                 WRITE32(dummy);
2172         }
2173         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2174                 if ((buflen -= 4) < 0)
2175                         goto out_resource;
2176                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2177                         WRITE32(NFS4_FH_PERSISTENT);
2178                 else
2179                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2180         }
2181         if (bmval0 & FATTR4_WORD0_CHANGE) {
2182                 if ((buflen -= 8) < 0)
2183                         goto out_resource;
2184                 write_change(&p, &stat, dentry->d_inode);
2185         }
2186         if (bmval0 & FATTR4_WORD0_SIZE) {
2187                 if ((buflen -= 8) < 0)
2188                         goto out_resource;
2189                 WRITE64(stat.size);
2190         }
2191         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2192                 if ((buflen -= 4) < 0)
2193                         goto out_resource;
2194                 WRITE32(1);
2195         }
2196         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2197                 if ((buflen -= 4) < 0)
2198                         goto out_resource;
2199                 WRITE32(1);
2200         }
2201         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2202                 if ((buflen -= 4) < 0)
2203                         goto out_resource;
2204                 WRITE32(0);
2205         }
2206         if (bmval0 & FATTR4_WORD0_FSID) {
2207                 if ((buflen -= 16) < 0)
2208                         goto out_resource;
2209                 if (exp->ex_fslocs.migrated) {
2210                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2211                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2212                 } else switch(fsid_source(fhp)) {
2213                 case FSIDSOURCE_FSID:
2214                         WRITE64((u64)exp->ex_fsid);
2215                         WRITE64((u64)0);
2216                         break;
2217                 case FSIDSOURCE_DEV:
2218                         WRITE32(0);
2219                         WRITE32(MAJOR(stat.dev));
2220                         WRITE32(0);
2221                         WRITE32(MINOR(stat.dev));
2222                         break;
2223                 case FSIDSOURCE_UUID:
2224                         WRITEMEM(exp->ex_uuid, 16);
2225                         break;
2226                 }
2227         }
2228         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2229                 if ((buflen -= 4) < 0)
2230                         goto out_resource;
2231                 WRITE32(0);
2232         }
2233         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2234                 if ((buflen -= 4) < 0)
2235                         goto out_resource;
2236                 WRITE32(nfsd4_lease);
2237         }
2238         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2239                 if ((buflen -= 4) < 0)
2240                         goto out_resource;
2241                 WRITE32(rdattr_err);
2242         }
2243         if (bmval0 & FATTR4_WORD0_ACL) {
2244                 struct nfs4_ace *ace;
2245
2246                 if (acl == NULL) {
2247                         if ((buflen -= 4) < 0)
2248                                 goto out_resource;
2249
2250                         WRITE32(0);
2251                         goto out_acl;
2252                 }
2253                 if ((buflen -= 4) < 0)
2254                         goto out_resource;
2255                 WRITE32(acl->naces);
2256
2257                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2258                         if ((buflen -= 4*3) < 0)
2259                                 goto out_resource;
2260                         WRITE32(ace->type);
2261                         WRITE32(ace->flag);
2262                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2263                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
2264                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2265                                 &p, &buflen);
2266                         if (status == nfserr_resource)
2267                                 goto out_resource;
2268                         if (status)
2269                                 goto out;
2270                 }
2271         }
2272 out_acl:
2273         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2274                 if ((buflen -= 4) < 0)
2275                         goto out_resource;
2276                 WRITE32(aclsupport ?
2277                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2278         }
2279         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2280                 if ((buflen -= 4) < 0)
2281                         goto out_resource;
2282                 WRITE32(1);
2283         }
2284         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2285                 if ((buflen -= 4) < 0)
2286                         goto out_resource;
2287                 WRITE32(0);
2288         }
2289         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2290                 if ((buflen -= 4) < 0)
2291                         goto out_resource;
2292                 WRITE32(1);
2293         }
2294         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2295                 if ((buflen -= 4) < 0)
2296                         goto out_resource;
2297                 WRITE32(1);
2298         }
2299         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2300                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2301                 if (buflen < 0)
2302                         goto out_resource;
2303                 WRITE32(fhp->fh_handle.fh_size);
2304                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2305         }
2306         if (bmval0 & FATTR4_WORD0_FILEID) {
2307                 if ((buflen -= 8) < 0)
2308                         goto out_resource;
2309                 WRITE64(stat.ino);
2310         }
2311         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2312                 if ((buflen -= 8) < 0)
2313                         goto out_resource;
2314                 WRITE64((u64) statfs.f_ffree);
2315         }
2316         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2317                 if ((buflen -= 8) < 0)
2318                         goto out_resource;
2319                 WRITE64((u64) statfs.f_ffree);
2320         }
2321         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2322                 if ((buflen -= 8) < 0)
2323                         goto out_resource;
2324                 WRITE64((u64) statfs.f_files);
2325         }
2326         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2327                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2328                 if (status == nfserr_resource)
2329                         goto out_resource;
2330                 if (status)
2331                         goto out;
2332         }
2333         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2334                 if ((buflen -= 4) < 0)
2335                         goto out_resource;
2336                 WRITE32(1);
2337         }
2338         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2339                 if ((buflen -= 8) < 0)
2340                         goto out_resource;
2341                 WRITE64(~(u64)0);
2342         }
2343         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2344                 if ((buflen -= 4) < 0)
2345                         goto out_resource;
2346                 WRITE32(255);
2347         }
2348         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2349                 if ((buflen -= 4) < 0)
2350                         goto out_resource;
2351                 WRITE32(statfs.f_namelen);
2352         }
2353         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2354                 if ((buflen -= 8) < 0)
2355                         goto out_resource;
2356                 WRITE64((u64) svc_max_payload(rqstp));
2357         }
2358         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2359                 if ((buflen -= 8) < 0)
2360                         goto out_resource;
2361                 WRITE64((u64) svc_max_payload(rqstp));
2362         }
2363         if (bmval1 & FATTR4_WORD1_MODE) {
2364                 if ((buflen -= 4) < 0)
2365                         goto out_resource;
2366                 WRITE32(stat.mode & S_IALLUGO);
2367         }
2368         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2369                 if ((buflen -= 4) < 0)
2370                         goto out_resource;
2371                 WRITE32(1);
2372         }
2373         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2374                 if ((buflen -= 4) < 0)
2375                         goto out_resource;
2376                 WRITE32(stat.nlink);
2377         }
2378         if (bmval1 & FATTR4_WORD1_OWNER) {
2379                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2380                 if (status == nfserr_resource)
2381                         goto out_resource;
2382                 if (status)
2383                         goto out;
2384         }
2385         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2386                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2387                 if (status == nfserr_resource)
2388                         goto out_resource;
2389                 if (status)
2390                         goto out;
2391         }
2392         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2393                 if ((buflen -= 8) < 0)
2394                         goto out_resource;
2395                 WRITE32((u32) MAJOR(stat.rdev));
2396                 WRITE32((u32) MINOR(stat.rdev));
2397         }
2398         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2399                 if ((buflen -= 8) < 0)
2400                         goto out_resource;
2401                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2402                 WRITE64(dummy64);
2403         }
2404         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2405                 if ((buflen -= 8) < 0)
2406                         goto out_resource;
2407                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2408                 WRITE64(dummy64);
2409         }
2410         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2411                 if ((buflen -= 8) < 0)
2412                         goto out_resource;
2413                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2414                 WRITE64(dummy64);
2415         }
2416         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2417                 if ((buflen -= 8) < 0)
2418                         goto out_resource;
2419                 dummy64 = (u64)stat.blocks << 9;
2420                 WRITE64(dummy64);
2421         }
2422         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2423                 if ((buflen -= 12) < 0)
2424                         goto out_resource;
2425                 WRITE32(0);
2426                 WRITE32(stat.atime.tv_sec);
2427                 WRITE32(stat.atime.tv_nsec);
2428         }
2429         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2430                 if ((buflen -= 12) < 0)
2431                         goto out_resource;
2432                 WRITE32(0);
2433                 WRITE32(1);
2434                 WRITE32(0);
2435         }
2436         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2437                 if ((buflen -= 12) < 0)
2438                         goto out_resource;
2439                 WRITE32(0);
2440                 WRITE32(stat.ctime.tv_sec);
2441                 WRITE32(stat.ctime.tv_nsec);
2442         }
2443         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2444                 if ((buflen -= 12) < 0)
2445                         goto out_resource;
2446                 WRITE32(0);
2447                 WRITE32(stat.mtime.tv_sec);
2448                 WRITE32(stat.mtime.tv_nsec);
2449         }
2450         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2451                 if ((buflen -= 8) < 0)
2452                         goto out_resource;
2453                 /*
2454                  * Get parent's attributes if not ignoring crossmount
2455                  * and this is the root of a cross-mounted filesystem.
2456                  */
2457                 if (ignore_crossmnt == 0 &&
2458                     dentry == exp->ex_path.mnt->mnt_root)
2459                         get_parent_attributes(exp, &stat);
2460                 WRITE64(stat.ino);
2461         }
2462         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2463                 WRITE32(3);
2464                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2465                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2466                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2467         }
2468
2469         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2470         *countp = p - buffer;
2471         status = nfs_ok;
2472
2473 out:
2474         kfree(acl);
2475         if (fhp == &tempfh)
2476                 fh_put(&tempfh);
2477         return status;
2478 out_nfserr:
2479         status = nfserrno(err);
2480         goto out;
2481 out_resource:
2482         *countp = 0;
2483         status = nfserr_resource;
2484         goto out;
2485 out_serverfault:
2486         status = nfserr_serverfault;
2487         goto out;
2488 }
2489
2490 static inline int attributes_need_mount(u32 *bmval)
2491 {
2492         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2493                 return 1;
2494         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2495                 return 1;
2496         return 0;
2497 }
2498
2499 static __be32
2500 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2501                 const char *name, int namlen, __be32 *p, int *buflen)
2502 {
2503         struct svc_export *exp = cd->rd_fhp->fh_export;
2504         struct dentry *dentry;
2505         __be32 nfserr;
2506         int ignore_crossmnt = 0;
2507
2508         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2509         if (IS_ERR(dentry))
2510                 return nfserrno(PTR_ERR(dentry));
2511         if (!dentry->d_inode) {
2512                 /*
2513                  * nfsd_buffered_readdir drops the i_mutex between
2514                  * readdir and calling this callback, leaving a window
2515                  * where this directory entry could have gone away.
2516                  */
2517                 dput(dentry);
2518                 return nfserr_noent;
2519         }
2520
2521         exp_get(exp);
2522         /*
2523          * In the case of a mountpoint, the client may be asking for
2524          * attributes that are only properties of the underlying filesystem
2525          * as opposed to the cross-mounted file system. In such a case,
2526          * we will not follow the cross mount and will fill the attribtutes
2527          * directly from the mountpoint dentry.
2528          */
2529         if (nfsd_mountpoint(dentry, exp)) {
2530                 int err;
2531
2532                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2533                                 && !attributes_need_mount(cd->rd_bmval)) {
2534                         ignore_crossmnt = 1;
2535                         goto out_encode;
2536                 }
2537                 /*
2538                  * Why the heck aren't we just using nfsd_lookup??
2539                  * Different "."/".." handling?  Something else?
2540                  * At least, add a comment here to explain....
2541                  */
2542                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2543                 if (err) {
2544                         nfserr = nfserrno(err);
2545                         goto out_put;
2546                 }
2547                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2548                 if (nfserr)
2549                         goto out_put;
2550
2551         }
2552 out_encode:
2553         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2554                                         cd->rd_rqstp, ignore_crossmnt);
2555 out_put:
2556         dput(dentry);
2557         exp_put(exp);
2558         return nfserr;
2559 }
2560
2561 static __be32 *
2562 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2563 {
2564         __be32 *attrlenp;
2565
2566         if (buflen < 6)
2567                 return NULL;
2568         *p++ = htonl(2);
2569         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2570         *p++ = htonl(0);                         /* bmval1 */
2571
2572         attrlenp = p++;
2573         *p++ = nfserr;       /* no htonl */
2574         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2575         return p;
2576 }
2577
2578 static int
2579 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2580                     loff_t offset, u64 ino, unsigned int d_type)
2581 {
2582         struct readdir_cd *ccd = ccdv;
2583         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2584         int buflen;
2585         __be32 *p = cd->buffer;
2586         __be32 *cookiep;
2587         __be32 nfserr = nfserr_toosmall;
2588
2589         /* In nfsv4, "." and ".." never make it onto the wire.. */
2590         if (name && isdotent(name, namlen)) {
2591                 cd->common.err = nfs_ok;
2592                 return 0;
2593         }
2594
2595         if (cd->offset)
2596                 xdr_encode_hyper(cd->offset, (u64) offset);
2597
2598         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2599         if (buflen < 0)
2600                 goto fail;
2601
2602         *p++ = xdr_one;                             /* mark entry present */
2603         cookiep = p;
2604         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2605         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2606
2607         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2608         switch (nfserr) {
2609         case nfs_ok:
2610                 p += buflen;
2611                 break;
2612         case nfserr_resource:
2613                 nfserr = nfserr_toosmall;
2614                 goto fail;
2615         case nfserr_noent:
2616                 goto skip_entry;
2617         default:
2618                 /*
2619                  * If the client requested the RDATTR_ERROR attribute,
2620                  * we stuff the error code into this attribute
2621                  * and continue.  If this attribute was not requested,
2622                  * then in accordance with the spec, we fail the
2623                  * entire READDIR operation(!)
2624                  */
2625                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2626                         goto fail;
2627                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2628                 if (p == NULL) {
2629                         nfserr = nfserr_toosmall;
2630                         goto fail;
2631                 }
2632         }
2633         cd->buflen -= (p - cd->buffer);
2634         cd->buffer = p;
2635         cd->offset = cookiep;
2636 skip_entry:
2637         cd->common.err = nfs_ok;
2638         return 0;
2639 fail:
2640         cd->common.err = nfserr;
2641         return -EINVAL;
2642 }
2643
2644 static void
2645 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2646 {
2647         __be32 *p;
2648
2649         RESERVE_SPACE(sizeof(stateid_t));
2650         WRITE32(sid->si_generation);
2651         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2652         ADJUST_ARGS();
2653 }
2654
2655 static __be32
2656 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2657 {
2658         __be32 *p;
2659
2660         if (!nfserr) {
2661                 RESERVE_SPACE(8);
2662                 WRITE32(access->ac_supported);
2663                 WRITE32(access->ac_resp_access);
2664                 ADJUST_ARGS();
2665         }
2666         return nfserr;
2667 }
2668
2669 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2670 {
2671         __be32 *p;
2672
2673         if (!nfserr) {
2674                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2675                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2676                 WRITE32(bcts->dir);
2677                 /* Sorry, we do not yet support RDMA over 4.1: */
2678                 WRITE32(0);
2679                 ADJUST_ARGS();
2680         }
2681         return nfserr;
2682 }
2683
2684 static __be32
2685 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2686 {
2687         ENCODE_SEQID_OP_HEAD;
2688
2689         if (!nfserr)
2690                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2691
2692         encode_seqid_op_tail(resp, save, nfserr);
2693         return nfserr;
2694 }
2695
2696
2697 static __be32
2698 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2699 {
2700         __be32 *p;
2701
2702         if (!nfserr) {
2703                 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2704                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2705                 ADJUST_ARGS();
2706         }
2707         return nfserr;
2708 }
2709
2710 static __be32
2711 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2712 {
2713         __be32 *p;
2714
2715         if (!nfserr) {
2716                 RESERVE_SPACE(32);
2717                 write_cinfo(&p, &create->cr_cinfo);
2718                 WRITE32(2);
2719                 WRITE32(create->cr_bmval[0]);
2720                 WRITE32(create->cr_bmval[1]);
2721                 ADJUST_ARGS();
2722         }
2723         return nfserr;
2724 }
2725
2726 static __be32
2727 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2728 {
2729         struct svc_fh *fhp = getattr->ga_fhp;
2730         int buflen;
2731
2732         if (nfserr)
2733                 return nfserr;
2734
2735         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2736         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2737                                     resp->p, &buflen, getattr->ga_bmval,
2738                                     resp->rqstp, 0);
2739         if (!nfserr)
2740                 resp->p += buflen;
2741         return nfserr;
2742 }
2743
2744 static __be32
2745 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2746 {
2747         struct svc_fh *fhp = *fhpp;
2748         unsigned int len;
2749         __be32 *p;
2750
2751         if (!nfserr) {
2752                 len = fhp->fh_handle.fh_size;
2753                 RESERVE_SPACE(len + 4);
2754                 WRITE32(len);
2755                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2756                 ADJUST_ARGS();
2757         }
2758         return nfserr;
2759 }
2760
2761 /*
2762 * Including all fields other than the name, a LOCK4denied structure requires
2763 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2764 */
2765 static void
2766 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2767 {
2768         struct xdr_netobj *conf = &ld->ld_owner;
2769         __be32 *p;
2770
2771         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2772         WRITE64(ld->ld_start);
2773         WRITE64(ld->ld_length);
2774         WRITE32(ld->ld_type);
2775         if (conf->len) {
2776                 WRITEMEM(&ld->ld_clientid, 8);
2777                 WRITE32(conf->len);
2778                 WRITEMEM(conf->data, conf->len);
2779                 kfree(conf->data);
2780         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2781                 WRITE64((u64)0); /* clientid */
2782                 WRITE32(0); /* length of owner name */
2783         }
2784         ADJUST_ARGS();
2785 }
2786
2787 static __be32
2788 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2789 {
2790         ENCODE_SEQID_OP_HEAD;
2791
2792         if (!nfserr)
2793                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2794         else if (nfserr == nfserr_denied)
2795                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2796
2797         encode_seqid_op_tail(resp, save, nfserr);
2798         return nfserr;
2799 }
2800
2801 static __be32
2802 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2803 {
2804         if (nfserr == nfserr_denied)
2805                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2806         return nfserr;
2807 }
2808
2809 static __be32
2810 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2811 {
2812         ENCODE_SEQID_OP_HEAD;
2813
2814         if (!nfserr)
2815                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2816
2817         encode_seqid_op_tail(resp, save, nfserr);
2818         return nfserr;
2819 }
2820
2821
2822 static __be32
2823 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2824 {
2825         __be32 *p;
2826
2827         if (!nfserr) {
2828                 RESERVE_SPACE(20);
2829                 write_cinfo(&p, &link->li_cinfo);
2830                 ADJUST_ARGS();
2831         }
2832         return nfserr;
2833 }
2834
2835
2836 static __be32
2837 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2838 {
2839         __be32 *p;
2840         ENCODE_SEQID_OP_HEAD;
2841
2842         if (nfserr)
2843                 goto out;
2844
2845         nfsd4_encode_stateid(resp, &open->op_stateid);
2846         RESERVE_SPACE(40);
2847         write_cinfo(&p, &open->op_cinfo);
2848         WRITE32(open->op_rflags);
2849         WRITE32(2);
2850         WRITE32(open->op_bmval[0]);
2851         WRITE32(open->op_bmval[1]);
2852         WRITE32(open->op_delegate_type);
2853         ADJUST_ARGS();
2854
2855         switch (open->op_delegate_type) {
2856         case NFS4_OPEN_DELEGATE_NONE:
2857                 break;
2858         case NFS4_OPEN_DELEGATE_READ:
2859                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2860                 RESERVE_SPACE(20);
2861                 WRITE32(open->op_recall);
2862
2863                 /*
2864                  * TODO: ACE's in delegations
2865                  */
2866                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2867                 WRITE32(0);
2868                 WRITE32(0);
2869                 WRITE32(0);   /* XXX: is NULL principal ok? */
2870                 ADJUST_ARGS();
2871                 break;
2872         case NFS4_OPEN_DELEGATE_WRITE:
2873                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2874                 RESERVE_SPACE(32);
2875                 WRITE32(0);
2876
2877                 /*
2878                  * TODO: space_limit's in delegations
2879                  */
2880                 WRITE32(NFS4_LIMIT_SIZE);
2881                 WRITE32(~(u32)0);
2882                 WRITE32(~(u32)0);
2883
2884                 /*
2885                  * TODO: ACE's in delegations
2886                  */
2887                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2888                 WRITE32(0);
2889                 WRITE32(0);
2890                 WRITE32(0);   /* XXX: is NULL principal ok? */
2891                 ADJUST_ARGS();
2892                 break;
2893         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2894                 switch (open->op_why_no_deleg) {
2895                 case WND4_CONTENTION:
2896                 case WND4_RESOURCE:
2897                         RESERVE_SPACE(8);
2898                         WRITE32(open->op_why_no_deleg);
2899                         WRITE32(0);     /* deleg signaling not supported yet */
2900                         break;
2901                 default:
2902                         RESERVE_SPACE(4);
2903                         WRITE32(open->op_why_no_deleg);
2904                 }
2905                 ADJUST_ARGS();
2906                 break;
2907         default:
2908                 BUG();
2909         }
2910         /* XXX save filehandle here */
2911 out:
2912         encode_seqid_op_tail(resp, save, nfserr);
2913         return nfserr;
2914 }
2915
2916 static __be32
2917 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2918 {
2919         ENCODE_SEQID_OP_HEAD;
2920
2921         if (!nfserr)
2922                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2923
2924         encode_seqid_op_tail(resp, save, nfserr);
2925         return nfserr;
2926 }
2927
2928 static __be32
2929 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2930 {
2931         ENCODE_SEQID_OP_HEAD;
2932
2933         if (!nfserr)
2934                 nfsd4_encode_stateid(resp, &od->od_stateid);
2935
2936         encode_seqid_op_tail(resp, save, nfserr);
2937         return nfserr;
2938 }
2939
2940 static __be32
2941 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2942                   struct nfsd4_read *read)
2943 {
2944         u32 eof;
2945         int v, pn;
2946         unsigned long maxcount;
2947         long len;
2948         __be32 *p;
2949
2950         if (nfserr)
2951                 return nfserr;
2952         if (resp->xbuf->page_len)
2953                 return nfserr_resource;
2954
2955         RESERVE_SPACE(8); /* eof flag and byte count */
2956
2957         maxcount = svc_max_payload(resp->rqstp);
2958         if (maxcount > read->rd_length)
2959                 maxcount = read->rd_length;
2960
2961         len = maxcount;
2962         v = 0;
2963         while (len > 0) {
2964                 pn = resp->rqstp->rq_resused++;
2965                 resp->rqstp->rq_vec[v].iov_base =
2966                         page_address(resp->rqstp->rq_respages[pn]);
2967                 resp->rqstp->rq_vec[v].iov_len =
2968                         len < PAGE_SIZE ? len : PAGE_SIZE;
2969                 v++;
2970                 len -= PAGE_SIZE;
2971         }
2972         read->rd_vlen = v;
2973
2974         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2975                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2976                         &maxcount);
2977
2978         if (nfserr)
2979                 return nfserr;
2980         eof = (read->rd_offset + maxcount >=
2981                read->rd_fhp->fh_dentry->d_inode->i_size);
2982
2983         WRITE32(eof);
2984         WRITE32(maxcount);
2985         ADJUST_ARGS();
2986         resp->xbuf->head[0].iov_len = (char*)p
2987                                         - (char*)resp->xbuf->head[0].iov_base;
2988         resp->xbuf->page_len = maxcount;
2989
2990         /* Use rest of head for padding and remaining ops: */
2991         resp->xbuf->tail[0].iov_base = p;
2992         resp->xbuf->tail[0].iov_len = 0;
2993         if (maxcount&3) {
2994                 RESERVE_SPACE(4);
2995                 WRITE32(0);
2996                 resp->xbuf->tail[0].iov_base += maxcount&3;
2997                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2998                 ADJUST_ARGS();
2999         }
3000         return 0;
3001 }
3002
3003 static __be32
3004 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3005 {
3006         int maxcount;
3007         char *page;
3008         __be32 *p;
3009
3010         if (nfserr)
3011                 return nfserr;
3012         if (resp->xbuf->page_len)
3013                 return nfserr_resource;
3014
3015         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3016
3017         maxcount = PAGE_SIZE;
3018         RESERVE_SPACE(4);
3019
3020         /*
3021          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3022          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3023          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3024          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3025          */
3026         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3027         if (nfserr == nfserr_isdir)
3028                 return nfserr_inval;
3029         if (nfserr)
3030                 return nfserr;
3031
3032         WRITE32(maxcount);
3033         ADJUST_ARGS();
3034         resp->xbuf->head[0].iov_len = (char*)p
3035                                 - (char*)resp->xbuf->head[0].iov_base;
3036         resp->xbuf->page_len = maxcount;
3037
3038         /* Use rest of head for padding and remaining ops: */
3039         resp->xbuf->tail[0].iov_base = p;
3040         resp->xbuf->tail[0].iov_len = 0;
3041         if (maxcount&3) {
3042                 RESERVE_SPACE(4);
3043                 WRITE32(0);
3044                 resp->xbuf->tail[0].iov_base += maxcount&3;
3045                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3046                 ADJUST_ARGS();
3047         }
3048         return 0;
3049 }
3050
3051 static __be32
3052 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3053 {
3054         int maxcount;
3055         loff_t offset;
3056         __be32 *page, *savep, *tailbase;
3057         __be32 *p;
3058
3059         if (nfserr)
3060                 return nfserr;
3061         if (resp->xbuf->page_len)
3062                 return nfserr_resource;
3063
3064         RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3065         savep = p;
3066
3067         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3068         WRITE32(0);
3069         WRITE32(0);
3070         ADJUST_ARGS();
3071         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3072         tailbase = p;
3073
3074         maxcount = PAGE_SIZE;
3075         if (maxcount > readdir->rd_maxcount)
3076                 maxcount = readdir->rd_maxcount;
3077
3078         /*
3079          * Convert from bytes to words, account for the two words already
3080          * written, make sure to leave two words at the end for the next
3081          * pointer and eof field.
3082          */
3083         maxcount = (maxcount >> 2) - 4;
3084         if (maxcount < 0) {
3085                 nfserr =  nfserr_toosmall;
3086                 goto err_no_verf;
3087         }
3088
3089         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3090         readdir->common.err = 0;
3091         readdir->buflen = maxcount;
3092         readdir->buffer = page;
3093         readdir->offset = NULL;
3094
3095         offset = readdir->rd_cookie;
3096         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3097                               &offset,
3098                               &readdir->common, nfsd4_encode_dirent);
3099         if (nfserr == nfs_ok &&
3100             readdir->common.err == nfserr_toosmall &&
3101             readdir->buffer == page)
3102                 nfserr = nfserr_toosmall;
3103         if (nfserr)
3104                 goto err_no_verf;
3105
3106         if (readdir->offset)
3107                 xdr_encode_hyper(readdir->offset, offset);
3108
3109         p = readdir->buffer;
3110         *p++ = 0;       /* no more entries */
3111         *p++ = htonl(readdir->common.err == nfserr_eof);
3112         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
3113                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
3114
3115         /* Use rest of head for padding and remaining ops: */
3116         resp->xbuf->tail[0].iov_base = tailbase;
3117         resp->xbuf->tail[0].iov_len = 0;
3118         resp->p = resp->xbuf->tail[0].iov_base;
3119         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3120
3121         return 0;
3122 err_no_verf:
3123         p = savep;
3124         ADJUST_ARGS();
3125         return nfserr;
3126 }
3127
3128 static __be32
3129 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3130 {
3131         __be32 *p;
3132
3133         if (!nfserr) {
3134                 RESERVE_SPACE(20);
3135                 write_cinfo(&p, &remove->rm_cinfo);
3136                 ADJUST_ARGS();
3137         }
3138         return nfserr;
3139 }
3140
3141 static __be32
3142 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3143 {
3144         __be32 *p;
3145
3146         if (!nfserr) {
3147                 RESERVE_SPACE(40);
3148                 write_cinfo(&p, &rename->rn_sinfo);
3149                 write_cinfo(&p, &rename->rn_tinfo);
3150                 ADJUST_ARGS();
3151         }
3152         return nfserr;
3153 }
3154
3155 static __be32
3156 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3157                          __be32 nfserr,struct svc_export *exp)
3158 {
3159         int i = 0;
3160         u32 nflavs;
3161         struct exp_flavor_info *flavs;
3162         struct exp_flavor_info def_flavs[2];
3163         __be32 *p;
3164
3165         if (nfserr)
3166                 goto out;
3167         if (exp->ex_nflavors) {
3168                 flavs = exp->ex_flavors;
3169                 nflavs = exp->ex_nflavors;
3170         } else { /* Handling of some defaults in absence of real secinfo: */
3171                 flavs = def_flavs;
3172                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3173                         nflavs = 2;
3174                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3175                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3176                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3177                         nflavs = 1;
3178                         flavs[0].pseudoflavor
3179                                         = svcauth_gss_flavor(exp->ex_client);
3180                 } else {
3181                         nflavs = 1;
3182                         flavs[0].pseudoflavor
3183                                         = exp->ex_client->flavour->flavour;
3184                 }
3185         }
3186
3187         RESERVE_SPACE(4);
3188         WRITE32(nflavs);
3189         ADJUST_ARGS();
3190         for (i = 0; i < nflavs; i++) {
3191                 u32 flav = flavs[i].pseudoflavor;
3192                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
3193
3194                 if (gm) {
3195                         RESERVE_SPACE(4);
3196                         WRITE32(RPC_AUTH_GSS);
3197                         ADJUST_ARGS();
3198                         RESERVE_SPACE(4 + gm->gm_oid.len);
3199                         WRITE32(gm->gm_oid.len);
3200                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
3201                         ADJUST_ARGS();
3202                         RESERVE_SPACE(4);
3203                         WRITE32(0); /* qop */
3204                         ADJUST_ARGS();
3205                         RESERVE_SPACE(4);
3206                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
3207                         ADJUST_ARGS();
3208                         gss_mech_put(gm);
3209                 } else {
3210                         RESERVE_SPACE(4);
3211                         WRITE32(flav);
3212                         ADJUST_ARGS();
3213                 }
3214         }
3215 out:
3216         if (exp)
3217                 exp_put(exp);
3218         return nfserr;
3219 }
3220
3221 static __be32
3222 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3223                      struct nfsd4_secinfo *secinfo)
3224 {
3225         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3226 }
3227
3228 static __be32
3229 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3230                      struct nfsd4_secinfo_no_name *secinfo)
3231 {
3232         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3233 }
3234
3235 /*
3236  * The SETATTR encode routine is special -- it always encodes a bitmap,
3237  * regardless of the error status.
3238  */
3239 static __be32
3240 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3241 {
3242         __be32 *p;
3243
3244         RESERVE_SPACE(12);
3245         if (nfserr) {
3246                 WRITE32(2);
3247                 WRITE32(0);
3248                 WRITE32(0);
3249         }
3250         else {
3251                 WRITE32(2);
3252                 WRITE32(setattr->sa_bmval[0]);
3253                 WRITE32(setattr->sa_bmval[1]);
3254         }
3255         ADJUST_ARGS();
3256         return nfserr;
3257 }
3258
3259 static __be32
3260 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3261 {
3262         __be32 *p;
3263
3264         if (!nfserr) {
3265                 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3266                 WRITEMEM(&scd->se_clientid, 8);
3267                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3268                 ADJUST_ARGS();
3269         }
3270         else if (nfserr == nfserr_clid_inuse) {
3271                 RESERVE_SPACE(8);
3272                 WRITE32(0);
3273                 WRITE32(0);
3274                 ADJUST_ARGS();
3275         }
3276         return nfserr;
3277 }
3278
3279 static __be32
3280 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3281 {
3282         __be32 *p;
3283
3284         if (!nfserr) {
3285                 RESERVE_SPACE(16);
3286                 WRITE32(write->wr_bytes_written);
3287                 WRITE32(write->wr_how_written);
3288                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3289                 ADJUST_ARGS();
3290         }
3291         return nfserr;
3292 }
3293
3294 static __be32
3295 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3296                          struct nfsd4_exchange_id *exid)
3297 {
3298         __be32 *p;
3299         char *major_id;
3300         char *server_scope;
3301         int major_id_sz;
3302         int server_scope_sz;
3303         uint64_t minor_id = 0;
3304
3305         if (nfserr)
3306                 return nfserr;
3307
3308         major_id = utsname()->nodename;
3309         major_id_sz = strlen(major_id);
3310         server_scope = utsname()->nodename;
3311         server_scope_sz = strlen(server_scope);
3312
3313         RESERVE_SPACE(
3314                 8 /* eir_clientid */ +
3315                 4 /* eir_sequenceid */ +
3316                 4 /* eir_flags */ +
3317                 4 /* spr_how (SP4_NONE) */ +
3318                 8 /* so_minor_id */ +
3319                 4 /* so_major_id.len */ +
3320                 (XDR_QUADLEN(major_id_sz) * 4) +
3321                 4 /* eir_server_scope.len */ +
3322                 (XDR_QUADLEN(server_scope_sz) * 4) +
3323                 4 /* eir_server_impl_id.count (0) */);
3324
3325         WRITEMEM(&exid->clientid, 8);
3326         WRITE32(exid->seqid);
3327         WRITE32(exid->flags);
3328
3329         /* state_protect4_r. Currently only support SP4_NONE */
3330         BUG_ON(exid->spa_how != SP4_NONE);
3331         WRITE32(exid->spa_how);
3332
3333         /* The server_owner struct */
3334         WRITE64(minor_id);      /* Minor id */
3335         /* major id */
3336         WRITE32(major_id_sz);
3337         WRITEMEM(major_id, major_id_sz);
3338
3339         /* Server scope */
3340         WRITE32(server_scope_sz);
3341         WRITEMEM(server_scope, server_scope_sz);
3342
3343         /* Implementation id */
3344         WRITE32(0);     /* zero length nfs_impl_id4 array */
3345         ADJUST_ARGS();
3346         return 0;
3347 }
3348
3349 static __be32
3350 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3351                             struct nfsd4_create_session *sess)
3352 {
3353         __be32 *p;
3354
3355         if (nfserr)
3356                 return nfserr;
3357
3358         RESERVE_SPACE(24);
3359         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3360         WRITE32(sess->seqid);
3361         WRITE32(sess->flags);
3362         ADJUST_ARGS();
3363
3364         RESERVE_SPACE(28);
3365         WRITE32(0); /* headerpadsz */
3366         WRITE32(sess->fore_channel.maxreq_sz);
3367         WRITE32(sess->fore_channel.maxresp_sz);
3368         WRITE32(sess->fore_channel.maxresp_cached);
3369         WRITE32(sess->fore_channel.maxops);
3370         WRITE32(sess->fore_channel.maxreqs);
3371         WRITE32(sess->fore_channel.nr_rdma_attrs);
3372         ADJUST_ARGS();
3373
3374         if (sess->fore_channel.nr_rdma_attrs) {
3375                 RESERVE_SPACE(4);
3376                 WRITE32(sess->fore_channel.rdma_attrs);
3377                 ADJUST_ARGS();
3378         }
3379
3380         RESERVE_SPACE(28);
3381         WRITE32(0); /* headerpadsz */
3382         WRITE32(sess->back_channel.maxreq_sz);
3383         WRITE32(sess->back_channel.maxresp_sz);
3384         WRITE32(sess->back_channel.maxresp_cached);
3385         WRITE32(sess->back_channel.maxops);
3386         WRITE32(sess->back_channel.maxreqs);
3387         WRITE32(sess->back_channel.nr_rdma_attrs);
3388         ADJUST_ARGS();
3389
3390         if (sess->back_channel.nr_rdma_attrs) {
3391                 RESERVE_SPACE(4);
3392                 WRITE32(sess->back_channel.rdma_attrs);
3393                 ADJUST_ARGS();
3394         }
3395         return 0;
3396 }
3397
3398 static __be32
3399 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3400                              struct nfsd4_destroy_session *destroy_session)
3401 {
3402         return nfserr;
3403 }
3404
3405 static __be32
3406 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3407                           struct nfsd4_free_stateid *free_stateid)
3408 {
3409         __be32 *p;
3410
3411         if (nfserr)
3412                 return nfserr;
3413
3414         RESERVE_SPACE(4);
3415         *p++ = nfserr;
3416         ADJUST_ARGS();
3417         return nfserr;
3418 }
3419
3420 static __be32
3421 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3422                       struct nfsd4_sequence *seq)
3423 {
3424         __be32 *p;
3425
3426         if (nfserr)
3427                 return nfserr;
3428
3429         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3430         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3431         WRITE32(seq->seqid);
3432         WRITE32(seq->slotid);
3433         /* Note slotid's are numbered from zero: */
3434         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3435         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3436         WRITE32(seq->status_flags);
3437
3438         ADJUST_ARGS();
3439         resp->cstate.datap = p; /* DRC cache data pointer */
3440         return 0;
3441 }
3442
3443 static __be32
3444 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3445                           struct nfsd4_test_stateid *test_stateid)
3446 {
3447         struct nfsd4_test_stateid_id *stateid, *next;
3448         __be32 *p;
3449
3450         RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3451         *p++ = htonl(test_stateid->ts_num_ids);
3452
3453         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3454                 *p++ = stateid->ts_id_status;
3455         }
3456
3457         ADJUST_ARGS();
3458         return nfserr;
3459 }
3460
3461 static __be32
3462 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3463 {
3464         return nfserr;
3465 }
3466
3467 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3468
3469 /*
3470  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3471  * since we don't need to filter out obsolete ops as this is
3472  * done in the decoding phase.
3473  */
3474 static nfsd4_enc nfsd4_enc_ops[] = {
3475         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3476         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3477         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3478         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3479         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3480         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3481         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3482         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3483         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3484         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3485         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3486         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3487         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3488         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3489         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3490         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3491         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3492         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3493         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3494         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3495         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3496         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3497         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3498         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3499         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3500         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3501         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3502         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3503         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3504         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3505         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3506         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3507         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3508         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3509         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3510         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3511         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3512
3513         /* NFSv4.1 operations */
3514         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3515         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3516         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3517         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3518         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3519         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3520         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3521         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3522         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3523         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3524         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3525         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3526         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3527         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3528         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3529         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3530         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3531         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3532         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3533 };
3534
3535 /*
3536  * Calculate the total amount of memory that the compound response has taken
3537  * after encoding the current operation with pad.
3538  *
3539  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3540  *      which was specified at nfsd4_operation, else pad is zero.
3541  *
3542  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3543  *
3544  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3545  * will be at least a page and will therefore hold the xdr_buf head.
3546  */
3547 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3548 {
3549         struct xdr_buf *xb = &resp->rqstp->rq_res;
3550         struct nfsd4_session *session = NULL;
3551         struct nfsd4_slot *slot = resp->cstate.slot;
3552         u32 length, tlen = 0;
3553
3554         if (!nfsd4_has_session(&resp->cstate))
3555                 return 0;
3556
3557         session = resp->cstate.session;
3558         if (session == NULL)
3559                 return 0;
3560
3561         if (xb->page_len == 0) {
3562                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3563         } else {
3564                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3565                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3566
3567                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3568         }
3569         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3570                 length, xb->page_len, tlen, pad);
3571
3572         if (length > session->se_fchannel.maxresp_sz)
3573                 return nfserr_rep_too_big;
3574
3575         if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3576             length > session->se_fchannel.maxresp_cached)
3577                 return nfserr_rep_too_big_to_cache;
3578
3579         return 0;
3580 }
3581
3582 void
3583 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3584 {
3585         __be32 *statp;
3586         __be32 *p;
3587
3588         RESERVE_SPACE(8);
3589         WRITE32(op->opnum);
3590         statp = p++;    /* to be backfilled at the end */
3591         ADJUST_ARGS();
3592
3593         if (op->opnum == OP_ILLEGAL)
3594                 goto status;
3595         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3596                !nfsd4_enc_ops[op->opnum]);
3597         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3598         /* nfsd4_check_drc_limit guarantees enough room for error status */
3599         if (!op->status)
3600                 op->status = nfsd4_check_resp_size(resp, 0);
3601 status:
3602         /*
3603          * Note: We write the status directly, instead of using WRITE32(),
3604          * since it is already in network byte order.
3605          */
3606         *statp = op->status;
3607 }
3608
3609 /*
3610  * Encode the reply stored in the stateowner reply cache
3611  *
3612  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3613  * previously sent already encoded operation.
3614  *
3615  * called with nfs4_lock_state() held
3616  */
3617 void
3618 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3619 {
3620         __be32 *p;
3621         struct nfs4_replay *rp = op->replay;
3622
3623         BUG_ON(!rp);
3624
3625         RESERVE_SPACE(8);
3626         WRITE32(op->opnum);
3627         *p++ = rp->rp_status;  /* already xdr'ed */
3628         ADJUST_ARGS();
3629
3630         RESERVE_SPACE(rp->rp_buflen);
3631         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3632         ADJUST_ARGS();
3633 }
3634
3635 int
3636 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3637 {
3638         return xdr_ressize_check(rqstp, p);
3639 }
3640
3641 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3642 {
3643         struct svc_rqst *rqstp = rq;
3644         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3645
3646         if (args->ops != args->iops) {
3647                 kfree(args->ops);
3648                 args->ops = args->iops;
3649         }
3650         kfree(args->tmpp);
3651         args->tmpp = NULL;
3652         while (args->to_free) {
3653                 struct tmpbuf *tb = args->to_free;
3654                 args->to_free = tb->next;
3655                 tb->release(tb->buf);
3656                 kfree(tb);
3657         }
3658         return 1;
3659 }
3660
3661 int
3662 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3663 {
3664         args->p = p;
3665         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3666         args->pagelist = rqstp->rq_arg.pages;
3667         args->pagelen = rqstp->rq_arg.page_len;
3668         args->tmpp = NULL;
3669         args->to_free = NULL;
3670         args->ops = args->iops;
3671         args->rqstp = rqstp;
3672
3673         return !nfsd4_decode_compound(args);
3674 }
3675
3676 int
3677 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3678 {
3679         /*
3680          * All that remains is to write the tag and operation count...
3681          */
3682         struct nfsd4_compound_state *cs = &resp->cstate;
3683         struct kvec *iov;
3684         p = resp->tagp;
3685         *p++ = htonl(resp->taglen);
3686         memcpy(p, resp->tag, resp->taglen);
3687         p += XDR_QUADLEN(resp->taglen);
3688         *p++ = htonl(resp->opcnt);
3689
3690         if (rqstp->rq_res.page_len)
3691                 iov = &rqstp->rq_res.tail[0];
3692         else
3693                 iov = &rqstp->rq_res.head[0];
3694         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3695         BUG_ON(iov->iov_len > PAGE_SIZE);
3696         if (nfsd4_has_session(cs)) {
3697                 if (cs->status != nfserr_replay_cache) {
3698                         nfsd4_store_cache_entry(resp);
3699                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3700                 }
3701                 /* Renew the clientid on success and on replay */
3702                 release_session_client(cs->session);
3703                 nfsd4_put_session(cs->session);
3704         }
3705         return 1;
3706 }
3707
3708 /*
3709  * Local variables:
3710  *  c-basic-offset: 8
3711  * End:
3712  */