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